obj-m := btrfs.o
btrfs-y := super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
hash.o file-item.o inode-item.o inode-map.o disk-io.o \
- transaction.o bit-radix.o
+ transaction.o bit-radix.o inode.o file.o
#btrfs-y := ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \
# root-tree.o dir-item.o hash.o file-item.o inode-item.o \
KERNELDIR := /lib/modules/`uname -r`/build
all::
- $(MAKE) C=1 -C $(KERNELDIR) M=`pwd` modules
+ $(MAKE) -C $(KERNELDIR) M=`pwd` modules
clean::
rm *.o btrfs.ko
endif
+* fix printk warnings
* cleanup, add more error checking, get rid of BUG_ONs
* Fix ENOSPC handling
* Make allocator smarter
int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
u64 isize);
-/* super.c */
+/* inode.c */
+void btrfs_delete_inode(struct inode *inode);
+void btrfs_read_locked_inode(struct inode *inode);
+int btrfs_write_inode(struct inode *inode, int wait);
+void btrfs_dirty_inode(struct inode *inode);
+struct inode *btrfs_alloc_inode(struct super_block *sb);
+void btrfs_destroy_inode(struct inode *inode);
+int btrfs_init_cachep(void);
+void btrfs_destroy_cachep(void);
+int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
+ unsigned long arg);
+long btrfs_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg);
+struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
+ struct btrfs_root *root);
+int btrfs_commit_write(struct file *file, struct page *page,
+ unsigned from, unsigned to);
+int btrfs_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *result, int create);
+/* file.c */
+extern struct file_operations btrfs_file_operations;
+int btrfs_drop_extents(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct inode *inode,
+ u64 start, u64 end, u64 *hint_block);
#endif
if (bh_blocknr(buf) != btrfs_header_blocknr(&node->header)) {
printk(KERN_CRIT "bh_blocknr(buf) is %Lu, header is %Lu\n",
bh_blocknr(buf), btrfs_header_blocknr(&node->header));
- BUG();
+ return 1;
}
return 0;
}
set_buffer_checked(bh);
}
if (check_tree_block(root, bh))
- BUG();
+ goto fail;
return bh;
fail:
brelse(bh);
struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
GFP_NOFS);
int ret;
+ int err = -EIO;
struct btrfs_super_block *disk_super;
+ if (!extent_root || !tree_root || !fs_info) {
+ err = -ENOMEM;
+ goto fail;
+ }
init_bit_radix(&fs_info->pinned_radix);
init_bit_radix(&fs_info->pending_del_radix);
init_bit_radix(&fs_info->extent_map_radix);
mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
fs_info->hash_tfm = crypto_alloc_hash("crc32c", 0, CRYPTO_ALG_ASYNC);
spin_lock_init(&fs_info->hash_lock);
+
if (!fs_info->hash_tfm || IS_ERR(fs_info->hash_tfm)) {
- printk("failed to allocate digest hash\n");
- return NULL;
+ printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
+ err = -ENOMEM;
+ goto fail_iput;
}
mutex_init(&fs_info->trans_mutex);
mutex_init(&fs_info->fs_mutex);
sb->s_blocksize);
if (!fs_info->sb_buffer)
- return NULL;
+ goto fail_iput;
disk_super = (struct btrfs_super_block *)fs_info->sb_buffer->b_data;
+
if (!btrfs_super_root(disk_super))
- return NULL;
+ goto fail_sb_buffer;
i_size_write(fs_info->btree_inode,
btrfs_super_total_blocks(disk_super) <<
fs_info->btree_inode->i_blkbits);
fs_info->disk_super = disk_super;
+
+ if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
+ sizeof(disk_super->magic))) {
+ printk("btrfs: valid FS not found on %s\n", sb->s_id);
+ goto fail_sb_buffer;
+ }
tree_root->node = read_tree_block(tree_root,
btrfs_super_root(disk_super));
- BUG_ON(!tree_root->node);
+ if (!tree_root->node)
+ goto fail_sb_buffer;
mutex_lock(&fs_info->fs_mutex);
ret = find_and_setup_root(sb->s_blocksize, tree_root, fs_info,
BTRFS_EXTENT_TREE_OBJECTID, extent_root);
- BUG_ON(ret);
+ if (ret) {
+ mutex_unlock(&fs_info->fs_mutex);
+ goto fail_tree_root;
+ }
btrfs_read_block_groups(extent_root);
fs_info->generation = btrfs_super_generation(disk_super) + 1;
mutex_unlock(&fs_info->fs_mutex);
return tree_root;
+
+fail_tree_root:
+ btrfs_block_release(tree_root, tree_root->node);
+fail_sb_buffer:
+ btrfs_block_release(tree_root, fs_info->sb_buffer);
+fail_iput:
+ iput(fs_info->btree_inode);
+fail:
+ kfree(extent_root);
+ kfree(tree_root);
+ kfree(fs_info);
+ return ERR_PTR(err);
}
int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
--- /dev/null
+#include <linux/module.h>
+#include <linux/buffer_head.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/highmem.h>
+#include <linux/time.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/backing-dev.h>
+#include <linux/mpage.h>
+#include <linux/swap.h>
+#include <linux/writeback.h>
+#include <linux/statfs.h>
+#include <linux/compat.h>
+#include "ctree.h"
+#include "disk-io.h"
+#include "transaction.h"
+#include "btrfs_inode.h"
+#include "ioctl.h"
+#include "print-tree.h"
+
+
+static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
+ struct page **prepared_pages,
+ const char __user * buf)
+{
+ long page_fault = 0;
+ int i;
+ int offset = pos & (PAGE_CACHE_SIZE - 1);
+
+ for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) {
+ size_t count = min_t(size_t,
+ PAGE_CACHE_SIZE - offset, write_bytes);
+ struct page *page = prepared_pages[i];
+ fault_in_pages_readable(buf, count);
+
+ /* Copy data from userspace to the current page */
+ kmap(page);
+ page_fault = __copy_from_user(page_address(page) + offset,
+ buf, count);
+ /* Flush processor's dcache for this page */
+ flush_dcache_page(page);
+ kunmap(page);
+ buf += count;
+ write_bytes -= count;
+
+ if (page_fault)
+ break;
+ }
+ return page_fault ? -EFAULT : 0;
+}
+
+static void btrfs_drop_pages(struct page **pages, size_t num_pages)
+{
+ size_t i;
+ for (i = 0; i < num_pages; i++) {
+ if (!pages[i])
+ break;
+ unlock_page(pages[i]);
+ mark_page_accessed(pages[i]);
+ page_cache_release(pages[i]);
+ }
+}
+
+static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct file *file,
+ struct page **pages,
+ size_t num_pages,
+ loff_t pos,
+ size_t write_bytes)
+{
+ int i;
+ int offset;
+ int err = 0;
+ int ret;
+ int this_write;
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct buffer_head *bh;
+ struct btrfs_file_extent_item *ei;
+
+ for (i = 0; i < num_pages; i++) {
+ offset = pos & (PAGE_CACHE_SIZE -1);
+ this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
+ /* FIXME, one block at a time */
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+
+ bh = page_buffers(pages[i]);
+
+ if (buffer_mapped(bh) && bh->b_blocknr == 0) {
+ struct btrfs_key key;
+ struct btrfs_path *path;
+ char *ptr;
+ u32 datasize;
+
+ /* create an inline extent, and copy the data in */
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ key.objectid = inode->i_ino;
+ key.offset = pages[i]->index << PAGE_CACHE_SHIFT;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
+ BUG_ON(write_bytes >= PAGE_CACHE_SIZE);
+ datasize = offset +
+ btrfs_file_extent_calc_inline_size(write_bytes);
+
+ ret = btrfs_insert_empty_item(trans, root, path, &key,
+ datasize);
+ BUG_ON(ret);
+ ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0], struct btrfs_file_extent_item);
+ btrfs_set_file_extent_generation(ei, trans->transid);
+ btrfs_set_file_extent_type(ei,
+ BTRFS_FILE_EXTENT_INLINE);
+ ptr = btrfs_file_extent_inline_start(ei);
+ btrfs_memcpy(root, path->nodes[0]->b_data,
+ ptr, bh->b_data, offset + write_bytes);
+ mark_buffer_dirty(path->nodes[0]);
+ btrfs_free_path(path);
+ } else if (buffer_mapped(bh)) {
+ /* csum the file data */
+ btrfs_csum_file_block(trans, root, inode->i_ino,
+ pages[i]->index << PAGE_CACHE_SHIFT,
+ kmap(pages[i]), PAGE_CACHE_SIZE);
+ kunmap(pages[i]);
+ }
+ SetPageChecked(pages[i]);
+ ret = btrfs_end_transaction(trans, root);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ ret = btrfs_commit_write(file, pages[i], offset,
+ offset + this_write);
+ pos += this_write;
+ if (ret) {
+ err = ret;
+ goto failed;
+ }
+ WARN_ON(this_write > write_bytes);
+ write_bytes -= this_write;
+ }
+failed:
+ return err;
+}
+
+/*
+ * this is very complex, but the basic idea is to drop all extents
+ * in the range start - end. hint_block is filled in with a block number
+ * that would be a good hint to the block allocator for this file.
+ *
+ * If an extent intersects the range but is not entirely inside the range
+ * it is either truncated or split. Anything entirely inside the range
+ * is deleted from the tree.
+ */
+int btrfs_drop_extents(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct inode *inode,
+ u64 start, u64 end, u64 *hint_block)
+{
+ int ret;
+ struct btrfs_key key;
+ struct btrfs_leaf *leaf;
+ int slot;
+ struct btrfs_file_extent_item *extent;
+ u64 extent_end = 0;
+ int keep;
+ struct btrfs_file_extent_item old;
+ struct btrfs_path *path;
+ u64 search_start = start;
+ int bookend;
+ int found_type;
+ int found_extent;
+ int found_inline;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ while(1) {
+ btrfs_release_path(root, path);
+ ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
+ search_start, -1);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ if (path->slots[0] == 0) {
+ ret = 0;
+ goto out;
+ }
+ path->slots[0]--;
+ }
+ keep = 0;
+ bookend = 0;
+ found_extent = 0;
+ found_inline = 0;
+ extent = NULL;
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ slot = path->slots[0];
+ btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
+ if (key.offset >= end || key.objectid != inode->i_ino) {
+ ret = 0;
+ goto out;
+ }
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) {
+ ret = 0;
+ goto out;
+ }
+ extent = btrfs_item_ptr(leaf, slot,
+ struct btrfs_file_extent_item);
+ found_type = btrfs_file_extent_type(extent);
+ if (found_type == BTRFS_FILE_EXTENT_REG) {
+ extent_end = key.offset +
+ (btrfs_file_extent_num_blocks(extent) <<
+ inode->i_blkbits);
+ found_extent = 1;
+ } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
+ found_inline = 1;
+ extent_end = key.offset +
+ btrfs_file_extent_inline_len(leaf->items + slot);
+ }
+
+ /* we found nothing we can drop */
+ if (!found_extent && !found_inline) {
+ ret = 0;
+ goto out;
+ }
+
+ /* we found nothing inside the range */
+ if (search_start >= extent_end) {
+ ret = 0;
+ goto out;
+ }
+
+ /* FIXME, there's only one inline extent allowed right now */
+ if (found_inline) {
+ u64 mask = root->blocksize - 1;
+ search_start = (extent_end + mask) & ~mask;
+ } else
+ search_start = extent_end;
+
+ if (end < extent_end && end >= key.offset) {
+ if (found_extent) {
+ u64 disk_blocknr =
+ btrfs_file_extent_disk_blocknr(extent);
+ u64 disk_num_blocks =
+ btrfs_file_extent_disk_num_blocks(extent);
+ memcpy(&old, extent, sizeof(old));
+ if (disk_blocknr != 0) {
+ ret = btrfs_inc_extent_ref(trans, root,
+ disk_blocknr, disk_num_blocks);
+ BUG_ON(ret);
+ }
+ }
+ WARN_ON(found_inline);
+ bookend = 1;
+ }
+
+ /* truncate existing extent */
+ if (start > key.offset) {
+ u64 new_num;
+ u64 old_num;
+ keep = 1;
+ WARN_ON(start & (root->blocksize - 1));
+ if (found_extent) {
+ new_num = (start - key.offset) >>
+ inode->i_blkbits;
+ old_num = btrfs_file_extent_num_blocks(extent);
+ *hint_block =
+ btrfs_file_extent_disk_blocknr(extent);
+ if (btrfs_file_extent_disk_blocknr(extent)) {
+ inode->i_blocks -=
+ (old_num - new_num) << 3;
+ }
+ btrfs_set_file_extent_num_blocks(extent,
+ new_num);
+ mark_buffer_dirty(path->nodes[0]);
+ } else {
+ WARN_ON(1);
+ }
+ }
+ /* delete the entire extent */
+ if (!keep) {
+ u64 disk_blocknr = 0;
+ u64 disk_num_blocks = 0;
+ u64 extent_num_blocks = 0;
+ if (found_extent) {
+ disk_blocknr =
+ btrfs_file_extent_disk_blocknr(extent);
+ disk_num_blocks =
+ btrfs_file_extent_disk_num_blocks(extent);
+ extent_num_blocks =
+ btrfs_file_extent_num_blocks(extent);
+ *hint_block =
+ btrfs_file_extent_disk_blocknr(extent);
+ }
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+ btrfs_release_path(root, path);
+ extent = NULL;
+ if (found_extent && disk_blocknr != 0) {
+ inode->i_blocks -= extent_num_blocks << 3;
+ ret = btrfs_free_extent(trans, root,
+ disk_blocknr,
+ disk_num_blocks, 0);
+ }
+
+ BUG_ON(ret);
+ if (!bookend && search_start >= end) {
+ ret = 0;
+ goto out;
+ }
+ if (!bookend)
+ continue;
+ }
+ /* create bookend, splitting the extent in two */
+ if (bookend && found_extent) {
+ struct btrfs_key ins;
+ ins.objectid = inode->i_ino;
+ ins.offset = end;
+ ins.flags = 0;
+ btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
+
+ btrfs_release_path(root, path);
+ ret = btrfs_insert_empty_item(trans, root, path, &ins,
+ sizeof(*extent));
+ BUG_ON(ret);
+ extent = btrfs_item_ptr(
+ btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
+ struct btrfs_file_extent_item);
+ btrfs_set_file_extent_disk_blocknr(extent,
+ btrfs_file_extent_disk_blocknr(&old));
+ btrfs_set_file_extent_disk_num_blocks(extent,
+ btrfs_file_extent_disk_num_blocks(&old));
+
+ btrfs_set_file_extent_offset(extent,
+ btrfs_file_extent_offset(&old) +
+ ((end - key.offset) >> inode->i_blkbits));
+ WARN_ON(btrfs_file_extent_num_blocks(&old) <
+ (extent_end - end) >> inode->i_blkbits);
+ btrfs_set_file_extent_num_blocks(extent,
+ (extent_end - end) >> inode->i_blkbits);
+
+ btrfs_set_file_extent_type(extent,
+ BTRFS_FILE_EXTENT_REG);
+ btrfs_set_file_extent_generation(extent,
+ btrfs_file_extent_generation(&old));
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+ if (btrfs_file_extent_disk_blocknr(&old) != 0) {
+ inode->i_blocks +=
+ btrfs_file_extent_num_blocks(extent) << 3;
+ }
+ ret = 0;
+ goto out;
+ }
+ }
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+/*
+ * this gets pages into the page cache and locks them down
+ */
+static int prepare_pages(struct btrfs_root *root,
+ struct file *file,
+ struct page **pages,
+ size_t num_pages,
+ loff_t pos,
+ unsigned long first_index,
+ unsigned long last_index,
+ size_t write_bytes,
+ u64 alloc_extent_start)
+{
+ int i;
+ unsigned long index = pos >> PAGE_CACHE_SHIFT;
+ struct inode *inode = file->f_path.dentry->d_inode;
+ int offset;
+ int err = 0;
+ int this_write;
+ struct buffer_head *bh;
+ struct buffer_head *head;
+ loff_t isize = i_size_read(inode);
+
+ memset(pages, 0, num_pages * sizeof(struct page *));
+
+ for (i = 0; i < num_pages; i++) {
+ pages[i] = grab_cache_page(inode->i_mapping, index + i);
+ if (!pages[i]) {
+ err = -ENOMEM;
+ goto failed_release;
+ }
+ cancel_dirty_page(pages[i], PAGE_CACHE_SIZE);
+ wait_on_page_writeback(pages[i]);
+ offset = pos & (PAGE_CACHE_SIZE -1);
+ this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
+ if (!page_has_buffers(pages[i])) {
+ create_empty_buffers(pages[i],
+ root->fs_info->sb->s_blocksize,
+ (1 << BH_Uptodate));
+ }
+ head = page_buffers(pages[i]);
+ bh = head;
+ do {
+ err = btrfs_map_bh_to_logical(root, bh,
+ alloc_extent_start);
+ BUG_ON(err);
+ if (err)
+ goto failed_truncate;
+ bh = bh->b_this_page;
+ if (alloc_extent_start)
+ alloc_extent_start++;
+ } while (bh != head);
+ pos += this_write;
+ WARN_ON(this_write > write_bytes);
+ write_bytes -= this_write;
+ }
+ return 0;
+
+failed_release:
+ btrfs_drop_pages(pages, num_pages);
+ return err;
+
+failed_truncate:
+ btrfs_drop_pages(pages, num_pages);
+ if (pos > isize)
+ vmtruncate(inode, isize);
+ return err;
+}
+
+static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ loff_t pos;
+ size_t num_written = 0;
+ int err = 0;
+ int ret = 0;
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct page *pages[8];
+ struct page *pinned[2];
+ unsigned long first_index;
+ unsigned long last_index;
+ u64 start_pos;
+ u64 num_blocks;
+ u64 alloc_extent_start;
+ u64 hint_block;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key ins;
+ pinned[0] = NULL;
+ pinned[1] = NULL;
+ if (file->f_flags & O_DIRECT)
+ return -EINVAL;
+ pos = *ppos;
+ vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
+ current->backing_dev_info = inode->i_mapping->backing_dev_info;
+ err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
+ if (err)
+ goto out;
+ if (count == 0)
+ goto out;
+ err = remove_suid(file->f_path.dentry);
+ if (err)
+ goto out;
+ file_update_time(file);
+
+ start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1);
+ num_blocks = (count + pos - start_pos + root->blocksize - 1) >>
+ inode->i_blkbits;
+
+ mutex_lock(&inode->i_mutex);
+ first_index = pos >> PAGE_CACHE_SHIFT;
+ last_index = (pos + count) >> PAGE_CACHE_SHIFT;
+
+ /*
+ * there are lots of better ways to do this, but this code
+ * makes sure the first and last page in the file range are
+ * up to date and ready for cow
+ */
+ if ((pos & (PAGE_CACHE_SIZE - 1))) {
+ pinned[0] = grab_cache_page(inode->i_mapping, first_index);
+ if (!PageUptodate(pinned[0])) {
+ ret = mpage_readpage(pinned[0], btrfs_get_block);
+ BUG_ON(ret);
+ wait_on_page_locked(pinned[0]);
+ } else {
+ unlock_page(pinned[0]);
+ }
+ }
+ if ((pos + count) & (PAGE_CACHE_SIZE - 1)) {
+ pinned[1] = grab_cache_page(inode->i_mapping, last_index);
+ if (!PageUptodate(pinned[1])) {
+ ret = mpage_readpage(pinned[1], btrfs_get_block);
+ BUG_ON(ret);
+ wait_on_page_locked(pinned[1]);
+ } else {
+ unlock_page(pinned[1]);
+ }
+ }
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ if (!trans) {
+ err = -ENOMEM;
+ mutex_unlock(&root->fs_info->fs_mutex);
+ goto out_unlock;
+ }
+ btrfs_set_trans_block_group(trans, inode);
+ /* FIXME blocksize != 4096 */
+ inode->i_blocks += num_blocks << 3;
+ hint_block = 0;
+
+ /* FIXME...EIEIO, ENOSPC and more */
+
+ /* step one, delete the existing extents in this range */
+ if (start_pos < inode->i_size) {
+ /* FIXME blocksize != pagesize */
+ ret = btrfs_drop_extents(trans, root, inode,
+ start_pos,
+ (pos + count + root->blocksize -1) &
+ ~((u64)root->blocksize - 1),
+ &hint_block);
+ BUG_ON(ret);
+ }
+
+ /* insert any holes we need to create */
+ if (inode->i_size < start_pos) {
+ u64 last_pos_in_file;
+ u64 hole_size;
+ u64 mask = root->blocksize - 1;
+ last_pos_in_file = (inode->i_size + mask) & ~mask;
+ hole_size = (start_pos - last_pos_in_file + mask) & ~mask;
+ hole_size >>= inode->i_blkbits;
+ if (last_pos_in_file < start_pos) {
+ ret = btrfs_insert_file_extent(trans, root,
+ inode->i_ino,
+ last_pos_in_file,
+ 0, 0, hole_size);
+ }
+ BUG_ON(ret);
+ }
+
+ /*
+ * either allocate an extent for the new bytes or setup the key
+ * to show we are doing inline data in the extent
+ */
+ if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size ||
+ pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) {
+ ret = btrfs_alloc_extent(trans, root, inode->i_ino,
+ num_blocks, hint_block, (u64)-1,
+ &ins, 1);
+ BUG_ON(ret);
+ ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
+ start_pos, ins.objectid, ins.offset,
+ ins.offset);
+ BUG_ON(ret);
+ } else {
+ ins.offset = 0;
+ ins.objectid = 0;
+ }
+ BUG_ON(ret);
+ alloc_extent_start = ins.objectid;
+ ret = btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ while(count > 0) {
+ size_t offset = pos & (PAGE_CACHE_SIZE - 1);
+ size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset);
+ size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
+ PAGE_CACHE_SHIFT;
+
+ memset(pages, 0, sizeof(pages));
+ ret = prepare_pages(root, file, pages, num_pages,
+ pos, first_index, last_index,
+ write_bytes, alloc_extent_start);
+ BUG_ON(ret);
+
+ /* FIXME blocks != pagesize */
+ if (alloc_extent_start)
+ alloc_extent_start += num_pages;
+ ret = btrfs_copy_from_user(pos, num_pages,
+ write_bytes, pages, buf);
+ BUG_ON(ret);
+
+ ret = dirty_and_release_pages(NULL, root, file, pages,
+ num_pages, pos, write_bytes);
+ BUG_ON(ret);
+ btrfs_drop_pages(pages, num_pages);
+
+ buf += write_bytes;
+ count -= write_bytes;
+ pos += write_bytes;
+ num_written += write_bytes;
+
+ balance_dirty_pages_ratelimited(inode->i_mapping);
+ btrfs_btree_balance_dirty(root);
+ cond_resched();
+ }
+out_unlock:
+ mutex_unlock(&inode->i_mutex);
+out:
+ if (pinned[0])
+ page_cache_release(pinned[0]);
+ if (pinned[1])
+ page_cache_release(pinned[1]);
+ *ppos = pos;
+ current->backing_dev_info = NULL;
+ mark_inode_dirty(inode);
+ return num_written ? num_written : err;
+}
+
+/*
+ * FIXME, do this by stuffing the csum we want in the info hanging off
+ * page->private. For now, verify file csums on read
+ */
+static int btrfs_read_actor(read_descriptor_t *desc, struct page *page,
+ unsigned long offset, unsigned long size)
+{
+ char *kaddr;
+ unsigned long left, count = desc->count;
+ struct inode *inode = page->mapping->host;
+
+ if (size > count)
+ size = count;
+
+ if (!PageChecked(page)) {
+ /* FIXME, do it per block */
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret;
+ struct buffer_head *bh;
+
+ if (page_has_buffers(page)) {
+ bh = page_buffers(page);
+ if (!buffer_mapped(bh)) {
+ SetPageChecked(page);
+ goto checked;
+ }
+ }
+
+ ret = btrfs_csum_verify_file_block(root,
+ page->mapping->host->i_ino,
+ page->index << PAGE_CACHE_SHIFT,
+ kmap(page), PAGE_CACHE_SIZE);
+ if (ret) {
+ if (ret != -ENOENT) {
+ printk("failed to verify ino %lu page %lu ret %d\n",
+ page->mapping->host->i_ino,
+ page->index, ret);
+ memset(page_address(page), 1, PAGE_CACHE_SIZE);
+ flush_dcache_page(page);
+ }
+ }
+ SetPageChecked(page);
+ kunmap(page);
+ }
+checked:
+ /*
+ * Faults on the destination of a read are common, so do it before
+ * taking the kmap.
+ */
+ if (!fault_in_pages_writeable(desc->arg.buf, size)) {
+ kaddr = kmap_atomic(page, KM_USER0);
+ left = __copy_to_user_inatomic(desc->arg.buf,
+ kaddr + offset, size);
+ kunmap_atomic(kaddr, KM_USER0);
+ if (left == 0)
+ goto success;
+ }
+
+ /* Do it the slow way */
+ kaddr = kmap(page);
+ left = __copy_to_user(desc->arg.buf, kaddr + offset, size);
+ kunmap(page);
+
+ if (left) {
+ size -= left;
+ desc->error = -EFAULT;
+ }
+success:
+ desc->count = count - size;
+ desc->written += size;
+ desc->arg.buf += size;
+ return size;
+}
+
+/**
+ * btrfs_file_aio_read - filesystem read routine, with a mod to csum verify
+ * @iocb: kernel I/O control block
+ * @iov: io vector request
+ * @nr_segs: number of segments in the iovec
+ * @pos: current file position
+ */
+static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ struct file *filp = iocb->ki_filp;
+ ssize_t retval;
+ unsigned long seg;
+ size_t count;
+ loff_t *ppos = &iocb->ki_pos;
+
+ count = 0;
+ for (seg = 0; seg < nr_segs; seg++) {
+ const struct iovec *iv = &iov[seg];
+
+ /*
+ * If any segment has a negative length, or the cumulative
+ * length ever wraps negative then return -EINVAL.
+ */
+ count += iv->iov_len;
+ if (unlikely((ssize_t)(count|iv->iov_len) < 0))
+ return -EINVAL;
+ if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len))
+ continue;
+ if (seg == 0)
+ return -EFAULT;
+ nr_segs = seg;
+ count -= iv->iov_len; /* This segment is no good */
+ break;
+ }
+ retval = 0;
+ if (count) {
+ for (seg = 0; seg < nr_segs; seg++) {
+ read_descriptor_t desc;
+
+ desc.written = 0;
+ desc.arg.buf = iov[seg].iov_base;
+ desc.count = iov[seg].iov_len;
+ if (desc.count == 0)
+ continue;
+ desc.error = 0;
+ do_generic_file_read(filp, ppos, &desc,
+ btrfs_read_actor);
+ retval += desc.written;
+ if (desc.error) {
+ retval = retval ?: desc.error;
+ break;
+ }
+ }
+ }
+ return retval;
+}
+
+static int btrfs_sync_file(struct file *file,
+ struct dentry *dentry, int datasync)
+{
+ struct inode *inode = dentry->d_inode;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret;
+ struct btrfs_trans_handle *trans;
+
+ /*
+ * FIXME, use inode generation number to check if we can skip the
+ * commit
+ */
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ if (!trans) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ ret = btrfs_commit_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+out:
+ return ret > 0 ? EIO : ret;
+}
+
+struct file_operations btrfs_file_operations = {
+ .llseek = generic_file_llseek,
+ .read = do_sync_read,
+ .aio_read = btrfs_file_aio_read,
+ .write = btrfs_file_write,
+ .mmap = generic_file_mmap,
+ .open = generic_file_open,
+ .ioctl = btrfs_ioctl,
+ .fsync = btrfs_sync_file,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = btrfs_compat_ioctl,
+#endif
+};
+
--- /dev/null
+#include <linux/module.h>
+#include <linux/buffer_head.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/highmem.h>
+#include <linux/time.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/backing-dev.h>
+#include <linux/mpage.h>
+#include <linux/swap.h>
+#include <linux/writeback.h>
+#include <linux/statfs.h>
+#include <linux/compat.h>
+#include "ctree.h"
+#include "disk-io.h"
+#include "transaction.h"
+#include "btrfs_inode.h"
+#include "ioctl.h"
+#include "print-tree.h"
+
+struct btrfs_iget_args {
+ u64 ino;
+ struct btrfs_root *root;
+};
+
+static struct inode_operations btrfs_dir_inode_operations;
+static struct inode_operations btrfs_symlink_inode_operations;
+static struct inode_operations btrfs_dir_ro_inode_operations;
+static struct inode_operations btrfs_file_inode_operations;
+static struct address_space_operations btrfs_aops;
+static struct address_space_operations btrfs_symlink_aops;
+static struct file_operations btrfs_dir_file_operations;
+
+static struct kmem_cache *btrfs_inode_cachep;
+struct kmem_cache *btrfs_trans_handle_cachep;
+struct kmem_cache *btrfs_transaction_cachep;
+struct kmem_cache *btrfs_bit_radix_cachep;
+struct kmem_cache *btrfs_path_cachep;
+
+#define S_SHIFT 12
+static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
+ [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
+ [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
+ [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
+ [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
+ [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
+ [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
+ [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
+};
+
+void btrfs_read_locked_inode(struct inode *inode)
+{
+ struct btrfs_path *path;
+ struct btrfs_inode_item *inode_item;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_key location;
+ u64 alloc_group_block;
+ int ret;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ mutex_lock(&root->fs_info->fs_mutex);
+
+ memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
+ ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
+ if (ret) {
+ btrfs_free_path(path);
+ goto make_bad;
+ }
+ inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
+ struct btrfs_inode_item);
+
+ inode->i_mode = btrfs_inode_mode(inode_item);
+ inode->i_nlink = btrfs_inode_nlink(inode_item);
+ inode->i_uid = btrfs_inode_uid(inode_item);
+ inode->i_gid = btrfs_inode_gid(inode_item);
+ inode->i_size = btrfs_inode_size(inode_item);
+ inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
+ inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
+ inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
+ inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
+ inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
+ inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
+ inode->i_blocks = btrfs_inode_nblocks(inode_item);
+ inode->i_generation = btrfs_inode_generation(inode_item);
+ alloc_group_block = btrfs_inode_block_group(inode_item);
+ BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
+ alloc_group_block);
+
+ btrfs_free_path(path);
+ inode_item = NULL;
+
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ switch (inode->i_mode & S_IFMT) {
+#if 0
+ default:
+ init_special_inode(inode, inode->i_mode,
+ btrfs_inode_rdev(inode_item));
+ break;
+#endif
+ case S_IFREG:
+ inode->i_mapping->a_ops = &btrfs_aops;
+ inode->i_fop = &btrfs_file_operations;
+ inode->i_op = &btrfs_file_inode_operations;
+ break;
+ case S_IFDIR:
+ inode->i_fop = &btrfs_dir_file_operations;
+ if (root == root->fs_info->tree_root)
+ inode->i_op = &btrfs_dir_ro_inode_operations;
+ else
+ inode->i_op = &btrfs_dir_inode_operations;
+ break;
+ case S_IFLNK:
+ inode->i_op = &btrfs_symlink_inode_operations;
+ inode->i_mapping->a_ops = &btrfs_symlink_aops;
+ break;
+ }
+ return;
+
+make_bad:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ make_bad_inode(inode);
+}
+
+static void fill_inode_item(struct btrfs_inode_item *item,
+ struct inode *inode)
+{
+ btrfs_set_inode_uid(item, inode->i_uid);
+ btrfs_set_inode_gid(item, inode->i_gid);
+ btrfs_set_inode_size(item, inode->i_size);
+ btrfs_set_inode_mode(item, inode->i_mode);
+ btrfs_set_inode_nlink(item, inode->i_nlink);
+ btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
+ btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
+ btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
+ btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
+ btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
+ btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
+ btrfs_set_inode_nblocks(item, inode->i_blocks);
+ btrfs_set_inode_generation(item, inode->i_generation);
+ btrfs_set_inode_block_group(item,
+ BTRFS_I(inode)->block_group->key.objectid);
+}
+
+static int btrfs_update_inode(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode)
+{
+ struct btrfs_inode_item *inode_item;
+ struct btrfs_path *path;
+ int ret;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ ret = btrfs_lookup_inode(trans, root, path,
+ &BTRFS_I(inode)->location, 1);
+ if (ret) {
+ if (ret > 0)
+ ret = -ENOENT;
+ goto failed;
+ }
+
+ inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
+ struct btrfs_inode_item);
+
+ fill_inode_item(inode_item, inode);
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+ ret = 0;
+failed:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ return ret;
+}
+
+
+static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *dir,
+ struct dentry *dentry)
+{
+ struct btrfs_path *path;
+ const char *name = dentry->d_name.name;
+ int name_len = dentry->d_name.len;
+ int ret = 0;
+ u64 objectid;
+ struct btrfs_dir_item *di;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
+ name, name_len, -1);
+ if (IS_ERR(di)) {
+ ret = PTR_ERR(di);
+ goto err;
+ }
+ if (!di) {
+ ret = -ENOENT;
+ goto err;
+ }
+ objectid = btrfs_disk_key_objectid(&di->location);
+ ret = btrfs_delete_one_dir_name(trans, root, path, di);
+ BUG_ON(ret);
+ btrfs_release_path(root, path);
+
+ di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
+ objectid, name, name_len, -1);
+ if (IS_ERR(di)) {
+ ret = PTR_ERR(di);
+ goto err;
+ }
+ if (!di) {
+ ret = -ENOENT;
+ goto err;
+ }
+ ret = btrfs_delete_one_dir_name(trans, root, path, di);
+ BUG_ON(ret);
+
+ dentry->d_inode->i_ctime = dir->i_ctime;
+err:
+ btrfs_free_path(path);
+ if (!ret) {
+ dir->i_size -= name_len * 2;
+ btrfs_update_inode(trans, root, dir);
+ drop_nlink(dentry->d_inode);
+ btrfs_update_inode(trans, root, dentry->d_inode);
+ dir->i_sb->s_dirt = 1;
+ }
+ return ret;
+}
+
+static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct btrfs_root *root;
+ struct btrfs_trans_handle *trans;
+ int ret;
+
+ root = BTRFS_I(dir)->root;
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
+ ret = btrfs_unlink_trans(trans, root, dir, dentry);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_btree_balance_dirty(root);
+ return ret;
+}
+
+static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+ int err;
+ int ret;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key found_key;
+ int found_type;
+ struct btrfs_leaf *leaf;
+ char *goodnames = "..";
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
+ key.objectid = inode->i_ino;
+ key.offset = (u64)-1;
+ key.flags = (u32)-1;
+ while(1) {
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret < 0) {
+ err = ret;
+ goto out;
+ }
+ BUG_ON(ret == 0);
+ if (path->slots[0] == 0) {
+ err = -ENOENT;
+ goto out;
+ }
+ path->slots[0]--;
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ btrfs_disk_key_to_cpu(&found_key,
+ &leaf->items[path->slots[0]].key);
+ found_type = btrfs_key_type(&found_key);
+ if (found_key.objectid != inode->i_ino) {
+ err = -ENOENT;
+ goto out;
+ }
+ if ((found_type != BTRFS_DIR_ITEM_KEY &&
+ found_type != BTRFS_DIR_INDEX_KEY) ||
+ (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
+ !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
+ err = -ENOTEMPTY;
+ goto out;
+ }
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+
+ if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
+ break;
+ btrfs_release_path(root, path);
+ }
+ ret = 0;
+ btrfs_release_path(root, path);
+
+ /* now the directory is empty */
+ err = btrfs_unlink_trans(trans, root, dir, dentry);
+ if (!err) {
+ inode->i_size = 0;
+ }
+out:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ ret = btrfs_end_transaction(trans, root);
+ btrfs_btree_balance_dirty(root);
+ if (ret && !err)
+ err = ret;
+ return err;
+}
+
+static int btrfs_free_inode(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode)
+{
+ struct btrfs_path *path;
+ int ret;
+
+ clear_inode(inode);
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ ret = btrfs_lookup_inode(trans, root, path,
+ &BTRFS_I(inode)->location, -1);
+ BUG_ON(ret);
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+ btrfs_free_path(path);
+ return ret;
+}
+
+/*
+ * truncates go from a high offset to a low offset. So, walk
+ * from hi to lo in the node and issue readas. Stop when you find
+ * keys from a different objectid
+ */
+static void reada_truncate(struct btrfs_root *root, struct btrfs_path *path,
+ u64 objectid)
+{
+ struct btrfs_node *node;
+ int i;
+ int nritems;
+ u64 item_objectid;
+ u64 blocknr;
+ int slot;
+ int ret;
+
+ if (!path->nodes[1])
+ return;
+ node = btrfs_buffer_node(path->nodes[1]);
+ slot = path->slots[1];
+ if (slot == 0)
+ return;
+ nritems = btrfs_header_nritems(&node->header);
+ for (i = slot - 1; i >= 0; i--) {
+ item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key);
+ if (item_objectid != objectid)
+ break;
+ blocknr = btrfs_node_blockptr(node, i);
+ ret = readahead_tree_block(root, blocknr);
+ if (ret)
+ break;
+ }
+}
+
+/*
+ * this can truncate away extent items, csum items and directory items.
+ * It starts at a high offset and removes keys until it can't find
+ * any higher than i_size.
+ *
+ * csum items that cross the new i_size are truncated to the new size
+ * as well.
+ */
+static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode)
+{
+ int ret;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct btrfs_disk_key *found_key;
+ u32 found_type;
+ struct btrfs_leaf *leaf;
+ struct btrfs_file_extent_item *fi;
+ u64 extent_start = 0;
+ u64 extent_num_blocks = 0;
+ u64 item_end = 0;
+ int found_extent;
+ int del_item;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ /* FIXME, add redo link to tree so we don't leak on crash */
+ key.objectid = inode->i_ino;
+ key.offset = (u64)-1;
+ key.flags = (u32)-1;
+ while(1) {
+ btrfs_init_path(path);
+ fi = NULL;
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret < 0) {
+ goto error;
+ }
+ if (ret > 0) {
+ BUG_ON(path->slots[0] == 0);
+ path->slots[0]--;
+ }
+ reada_truncate(root, path, inode->i_ino);
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ found_key = &leaf->items[path->slots[0]].key;
+ found_type = btrfs_disk_key_type(found_key);
+
+ if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
+ break;
+ if (found_type != BTRFS_CSUM_ITEM_KEY &&
+ found_type != BTRFS_DIR_ITEM_KEY &&
+ found_type != BTRFS_DIR_INDEX_KEY &&
+ found_type != BTRFS_EXTENT_DATA_KEY)
+ break;
+
+ item_end = btrfs_disk_key_offset(found_key);
+ if (found_type == BTRFS_EXTENT_DATA_KEY) {
+ fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0],
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(fi) !=
+ BTRFS_FILE_EXTENT_INLINE) {
+ item_end += btrfs_file_extent_num_blocks(fi) <<
+ inode->i_blkbits;
+ }
+ }
+ if (found_type == BTRFS_CSUM_ITEM_KEY) {
+ ret = btrfs_csum_truncate(trans, root, path,
+ inode->i_size);
+ BUG_ON(ret);
+ }
+ if (item_end < inode->i_size) {
+ if (found_type) {
+ btrfs_set_key_type(&key, found_type - 1);
+ continue;
+ }
+ break;
+ }
+ if (btrfs_disk_key_offset(found_key) >= inode->i_size)
+ del_item = 1;
+ else
+ del_item = 0;
+ found_extent = 0;
+
+ /* FIXME, shrink the extent if the ref count is only 1 */
+ if (found_type == BTRFS_EXTENT_DATA_KEY &&
+ btrfs_file_extent_type(fi) !=
+ BTRFS_FILE_EXTENT_INLINE) {
+ u64 num_dec;
+ if (!del_item) {
+ u64 orig_num_blocks =
+ btrfs_file_extent_num_blocks(fi);
+ extent_num_blocks = inode->i_size -
+ btrfs_disk_key_offset(found_key) +
+ root->blocksize - 1;
+ extent_num_blocks >>= inode->i_blkbits;
+ btrfs_set_file_extent_num_blocks(fi,
+ extent_num_blocks);
+ inode->i_blocks -= (orig_num_blocks -
+ extent_num_blocks) << 3;
+ mark_buffer_dirty(path->nodes[0]);
+ } else {
+ extent_start =
+ btrfs_file_extent_disk_blocknr(fi);
+ extent_num_blocks =
+ btrfs_file_extent_disk_num_blocks(fi);
+ /* FIXME blocksize != 4096 */
+ num_dec = btrfs_file_extent_num_blocks(fi) << 3;
+ if (extent_start != 0) {
+ found_extent = 1;
+ inode->i_blocks -= num_dec;
+ }
+ }
+ }
+ if (del_item) {
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+ } else {
+ break;
+ }
+ btrfs_release_path(root, path);
+ if (found_extent) {
+ ret = btrfs_free_extent(trans, root, extent_start,
+ extent_num_blocks, 0);
+ BUG_ON(ret);
+ }
+ }
+ ret = 0;
+error:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ inode->i_sb->s_dirt = 1;
+ return ret;
+}
+
+/*
+ * taken from block_truncate_page, but does cow as it zeros out
+ * any bytes left in the last page in the file.
+ */
+static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
+{
+ struct inode *inode = mapping->host;
+ unsigned blocksize = 1 << inode->i_blkbits;
+ pgoff_t index = from >> PAGE_CACHE_SHIFT;
+ unsigned offset = from & (PAGE_CACHE_SIZE-1);
+ struct page *page;
+ char *kaddr;
+ int ret = 0;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ u64 alloc_hint = 0;
+ struct btrfs_key ins;
+ struct btrfs_trans_handle *trans;
+
+ if ((offset & (blocksize - 1)) == 0)
+ goto out;
+
+ ret = -ENOMEM;
+ page = grab_cache_page(mapping, index);
+ if (!page)
+ goto out;
+
+ if (!PageUptodate(page)) {
+ ret = mpage_readpage(page, btrfs_get_block);
+ lock_page(page);
+ if (!PageUptodate(page)) {
+ ret = -EIO;
+ goto out;
+ }
+ }
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+
+ ret = btrfs_drop_extents(trans, root, inode,
+ page->index << PAGE_CACHE_SHIFT,
+ (page->index + 1) << PAGE_CACHE_SHIFT,
+ &alloc_hint);
+ BUG_ON(ret);
+ ret = btrfs_alloc_extent(trans, root, inode->i_ino, 1,
+ alloc_hint, (u64)-1, &ins, 1);
+ BUG_ON(ret);
+ ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
+ page->index << PAGE_CACHE_SHIFT,
+ ins.objectid, 1, 1);
+ BUG_ON(ret);
+ SetPageChecked(page);
+ kaddr = kmap(page);
+ memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
+ flush_dcache_page(page);
+ btrfs_csum_file_block(trans, root, inode->i_ino,
+ page->index << PAGE_CACHE_SHIFT,
+ kaddr, PAGE_CACHE_SIZE);
+ kunmap(page);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ set_page_dirty(page);
+ unlock_page(page);
+ page_cache_release(page);
+out:
+ return ret;
+}
+
+static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = dentry->d_inode;
+ int err;
+
+ err = inode_change_ok(inode, attr);
+ if (err)
+ return err;
+
+ if (S_ISREG(inode->i_mode) &&
+ attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ u64 mask = root->blocksize - 1;
+ u64 pos = (inode->i_size + mask) & ~mask;
+ u64 hole_size;
+
+ if (attr->ia_size <= pos)
+ goto out;
+
+ btrfs_truncate_page(inode->i_mapping, inode->i_size);
+
+ hole_size = (attr->ia_size - pos + mask) & ~mask;
+ hole_size >>= inode->i_blkbits;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+ err = btrfs_insert_file_extent(trans, root, inode->i_ino,
+ pos, 0, 0, hole_size);
+ BUG_ON(err);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ }
+out:
+ err = inode_setattr(inode, attr);
+
+ return err;
+}
+void btrfs_delete_inode(struct inode *inode)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret;
+
+ truncate_inode_pages(&inode->i_data, 0);
+ if (is_bad_inode(inode)) {
+ goto no_delete;
+ }
+ inode->i_size = 0;
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+ ret = btrfs_truncate_in_trans(trans, root, inode);
+ BUG_ON(ret);
+ btrfs_free_inode(trans, root, inode);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_btree_balance_dirty(root);
+ return;
+no_delete:
+ clear_inode(inode);
+}
+
+/*
+ * this returns the key found in the dir entry in the location pointer.
+ * If no dir entries were found, location->objectid is 0.
+ */
+static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
+ struct btrfs_key *location)
+{
+ const char *name = dentry->d_name.name;
+ int namelen = dentry->d_name.len;
+ struct btrfs_dir_item *di;
+ struct btrfs_path *path;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ int ret;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
+ namelen, 0);
+ if (!di || IS_ERR(di)) {
+ location->objectid = 0;
+ ret = 0;
+ goto out;
+ }
+ btrfs_disk_key_to_cpu(location, &di->location);
+out:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ return ret;
+}
+
+/*
+ * when we hit a tree root in a directory, the btrfs part of the inode
+ * needs to be changed to reflect the root directory of the tree root. This
+ * is kind of like crossing a mount point.
+ */
+static int fixup_tree_root_location(struct btrfs_root *root,
+ struct btrfs_key *location,
+ struct btrfs_root **sub_root)
+{
+ struct btrfs_path *path;
+ struct btrfs_root_item *ri;
+
+ if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
+ return 0;
+ if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
+ return 0;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ mutex_lock(&root->fs_info->fs_mutex);
+
+ *sub_root = btrfs_read_fs_root(root->fs_info, location);
+ if (IS_ERR(*sub_root))
+ return PTR_ERR(*sub_root);
+
+ ri = &(*sub_root)->root_item;
+ location->objectid = btrfs_root_dirid(ri);
+ location->flags = 0;
+ btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
+ location->offset = 0;
+
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return 0;
+}
+
+static int btrfs_init_locked_inode(struct inode *inode, void *p)
+{
+ struct btrfs_iget_args *args = p;
+ inode->i_ino = args->ino;
+ BTRFS_I(inode)->root = args->root;
+ return 0;
+}
+
+static int btrfs_find_actor(struct inode *inode, void *opaque)
+{
+ struct btrfs_iget_args *args = opaque;
+ return (args->ino == inode->i_ino &&
+ args->root == BTRFS_I(inode)->root);
+}
+
+struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
+ struct btrfs_root *root)
+{
+ struct inode *inode;
+ struct btrfs_iget_args args;
+ args.ino = objectid;
+ args.root = root;
+
+ inode = iget5_locked(s, objectid, btrfs_find_actor,
+ btrfs_init_locked_inode,
+ (void *)&args);
+ return inode;
+}
+
+static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd)
+{
+ struct inode * inode;
+ struct btrfs_inode *bi = BTRFS_I(dir);
+ struct btrfs_root *root = bi->root;
+ struct btrfs_root *sub_root = root;
+ struct btrfs_key location;
+ int ret;
+
+ if (dentry->d_name.len > BTRFS_NAME_LEN)
+ return ERR_PTR(-ENAMETOOLONG);
+ mutex_lock(&root->fs_info->fs_mutex);
+ ret = btrfs_inode_by_name(dir, dentry, &location);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ inode = NULL;
+ if (location.objectid) {
+ ret = fixup_tree_root_location(root, &location, &sub_root);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ if (ret > 0)
+ return ERR_PTR(-ENOENT);
+ inode = btrfs_iget_locked(dir->i_sb, location.objectid,
+ sub_root);
+ if (!inode)
+ return ERR_PTR(-EACCES);
+ if (inode->i_state & I_NEW) {
+ /* the inode and parent dir are two different roots */
+ if (sub_root != root) {
+ igrab(inode);
+ sub_root->inode = inode;
+ }
+ BTRFS_I(inode)->root = sub_root;
+ memcpy(&BTRFS_I(inode)->location, &location,
+ sizeof(location));
+ btrfs_read_locked_inode(inode);
+ unlock_new_inode(inode);
+ }
+ }
+ return d_splice_alias(inode, dentry);
+}
+
+/*
+ * readahead one full node of leaves as long as their keys include
+ * the objectid supplied
+ */
+static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path,
+ u64 objectid)
+{
+ struct btrfs_node *node;
+ int i;
+ u32 nritems;
+ u64 item_objectid;
+ u64 blocknr;
+ int slot;
+ int ret;
+
+ if (!path->nodes[1])
+ return;
+ node = btrfs_buffer_node(path->nodes[1]);
+ slot = path->slots[1];
+ nritems = btrfs_header_nritems(&node->header);
+ for (i = slot + 1; i < nritems; i++) {
+ item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key);
+ if (item_objectid != objectid)
+ break;
+ blocknr = btrfs_node_blockptr(node, i);
+ ret = readahead_tree_block(root, blocknr);
+ if (ret)
+ break;
+ }
+}
+static unsigned char btrfs_filetype_table[] = {
+ DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
+};
+
+static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_item *item;
+ struct btrfs_dir_item *di;
+ struct btrfs_key key;
+ struct btrfs_path *path;
+ int ret;
+ u32 nritems;
+ struct btrfs_leaf *leaf;
+ int slot;
+ int advance;
+ unsigned char d_type;
+ int over = 0;
+ u32 di_cur;
+ u32 di_total;
+ u32 di_len;
+ int key_type = BTRFS_DIR_INDEX_KEY;
+
+ /* FIXME, use a real flag for deciding about the key type */
+ if (root->fs_info->tree_root == root)
+ key_type = BTRFS_DIR_ITEM_KEY;
+ mutex_lock(&root->fs_info->fs_mutex);
+ key.objectid = inode->i_ino;
+ key.flags = 0;
+ btrfs_set_key_type(&key, key_type);
+ key.offset = filp->f_pos;
+ path = btrfs_alloc_path();
+ btrfs_init_path(path);
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
+ goto err;
+ advance = 0;
+ reada_leaves(root, path, inode->i_ino);
+ while(1) {
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ nritems = btrfs_header_nritems(&leaf->header);
+ slot = path->slots[0];
+ if (advance || slot >= nritems) {
+ if (slot >= nritems -1) {
+ reada_leaves(root, path, inode->i_ino);
+ ret = btrfs_next_leaf(root, path);
+ if (ret)
+ break;
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ nritems = btrfs_header_nritems(&leaf->header);
+ slot = path->slots[0];
+ } else {
+ slot++;
+ path->slots[0]++;
+ }
+ }
+ advance = 1;
+ item = leaf->items + slot;
+ if (btrfs_disk_key_objectid(&item->key) != key.objectid)
+ break;
+ if (btrfs_disk_key_type(&item->key) != key_type)
+ break;
+ if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
+ continue;
+ filp->f_pos = btrfs_disk_key_offset(&item->key);
+ advance = 1;
+ di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
+ di_cur = 0;
+ di_total = btrfs_item_size(leaf->items + slot);
+ while(di_cur < di_total) {
+ d_type = btrfs_filetype_table[btrfs_dir_type(di)];
+ over = filldir(dirent, (const char *)(di + 1),
+ btrfs_dir_name_len(di),
+ btrfs_disk_key_offset(&item->key),
+ btrfs_disk_key_objectid(&di->location),
+ d_type);
+ if (over)
+ goto nopos;
+ di_len = btrfs_dir_name_len(di) + sizeof(*di);
+ di_cur += di_len;
+ di = (struct btrfs_dir_item *)((char *)di + di_len);
+ }
+ }
+ filp->f_pos++;
+nopos:
+ ret = 0;
+err:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return ret;
+}
+
+int btrfs_write_inode(struct inode *inode, int wait)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_trans_handle *trans;
+ int ret = 0;
+
+ if (wait) {
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+ ret = btrfs_commit_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ }
+ return ret;
+}
+
+/*
+ * This is somewhat expense, updating the tree every time the
+ * inode changes. But, it is most likely to find the inode in cache.
+ * FIXME, needs more benchmarking...there are no reasons other than performance
+ * to keep or drop this code.
+ */
+void btrfs_dirty_inode(struct inode *inode)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_trans_handle *trans;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+ btrfs_update_inode(trans, root, inode);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_btree_balance_dirty(root);
+}
+
+static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 objectid,
+ struct btrfs_block_group_cache *group,
+ int mode)
+{
+ struct inode *inode;
+ struct btrfs_inode_item inode_item;
+ struct btrfs_key *location;
+ int ret;
+ int owner;
+
+ inode = new_inode(root->fs_info->sb);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ BTRFS_I(inode)->root = root;
+ if (mode & S_IFDIR)
+ owner = 0;
+ else
+ owner = 1;
+ group = btrfs_find_block_group(root, group, 0, 0, owner);
+ BTRFS_I(inode)->block_group = group;
+
+ inode->i_uid = current->fsuid;
+ inode->i_gid = current->fsgid;
+ inode->i_mode = mode;
+ inode->i_ino = objectid;
+ inode->i_blocks = 0;
+ inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
+ fill_inode_item(&inode_item, inode);
+ location = &BTRFS_I(inode)->location;
+ location->objectid = objectid;
+ location->flags = 0;
+ location->offset = 0;
+ btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
+
+ ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
+ BUG_ON(ret);
+
+ insert_inode_hash(inode);
+ return inode;
+}
+
+static inline u8 btrfs_inode_type(struct inode *inode)
+{
+ return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
+}
+
+static int btrfs_add_link(struct btrfs_trans_handle *trans,
+ struct dentry *dentry, struct inode *inode)
+{
+ int ret;
+ struct btrfs_key key;
+ struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
+ key.objectid = inode->i_ino;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+ key.offset = 0;
+
+ ret = btrfs_insert_dir_item(trans, root,
+ dentry->d_name.name, dentry->d_name.len,
+ dentry->d_parent->d_inode->i_ino,
+ &key, btrfs_inode_type(inode));
+ if (ret == 0) {
+ dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2;
+ ret = btrfs_update_inode(trans, root,
+ dentry->d_parent->d_inode);
+ }
+ return ret;
+}
+
+static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
+ struct dentry *dentry, struct inode *inode)
+{
+ int err = btrfs_add_link(trans, dentry, inode);
+ if (!err) {
+ d_instantiate(dentry, inode);
+ return 0;
+ }
+ if (err > 0)
+ err = -EEXIST;
+ return err;
+}
+
+static int btrfs_create(struct inode *dir, struct dentry *dentry,
+ int mode, struct nameidata *nd)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct inode *inode;
+ int err;
+ int drop_inode = 0;
+ u64 objectid;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
+
+ err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
+ if (err) {
+ err = -ENOSPC;
+ goto out_unlock;
+ }
+
+ inode = btrfs_new_inode(trans, root, objectid,
+ BTRFS_I(dir)->block_group, mode);
+ err = PTR_ERR(inode);
+ if (IS_ERR(inode))
+ goto out_unlock;
+
+ btrfs_set_trans_block_group(trans, inode);
+ err = btrfs_add_nondir(trans, dentry, inode);
+ if (err)
+ drop_inode = 1;
+ else {
+ inode->i_mapping->a_ops = &btrfs_aops;
+ inode->i_fop = &btrfs_file_operations;
+ inode->i_op = &btrfs_file_inode_operations;
+ }
+ dir->i_sb->s_dirt = 1;
+ btrfs_update_inode_block_group(trans, inode);
+ btrfs_update_inode_block_group(trans, dir);
+out_unlock:
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ if (drop_inode) {
+ inode_dec_link_count(inode);
+ iput(inode);
+ }
+ btrfs_btree_balance_dirty(root);
+ return err;
+}
+
+static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *dentry)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct inode *inode = old_dentry->d_inode;
+ int err;
+ int drop_inode = 0;
+
+ if (inode->i_nlink == 0)
+ return -ENOENT;
+
+ inc_nlink(inode);
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
+ atomic_inc(&inode->i_count);
+ err = btrfs_add_nondir(trans, dentry, inode);
+ if (err)
+ drop_inode = 1;
+ dir->i_sb->s_dirt = 1;
+ btrfs_update_inode_block_group(trans, dir);
+ btrfs_update_inode(trans, root, inode);
+
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ if (drop_inode) {
+ inode_dec_link_count(inode);
+ iput(inode);
+ }
+ btrfs_btree_balance_dirty(root);
+ return err;
+}
+
+static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 objectid, u64 dirid)
+{
+ int ret;
+ char buf[2];
+ struct btrfs_key key;
+
+ buf[0] = '.';
+ buf[1] = '.';
+
+ key.objectid = objectid;
+ key.offset = 0;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
+
+ ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
+ &key, BTRFS_FT_DIR);
+ if (ret)
+ goto error;
+ key.objectid = dirid;
+ ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
+ &key, BTRFS_FT_DIR);
+ if (ret)
+ goto error;
+error:
+ return ret;
+}
+
+static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+ struct inode *inode;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ int err = 0;
+ int drop_on_err = 0;
+ u64 objectid;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
+ if (IS_ERR(trans)) {
+ err = PTR_ERR(trans);
+ goto out_unlock;
+ }
+
+ err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
+ if (err) {
+ err = -ENOSPC;
+ goto out_unlock;
+ }
+
+ inode = btrfs_new_inode(trans, root, objectid,
+ BTRFS_I(dir)->block_group, S_IFDIR | mode);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ goto out_fail;
+ }
+ drop_on_err = 1;
+ inode->i_op = &btrfs_dir_inode_operations;
+ inode->i_fop = &btrfs_dir_file_operations;
+ btrfs_set_trans_block_group(trans, inode);
+
+ err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
+ if (err)
+ goto out_fail;
+
+ inode->i_size = 6;
+ err = btrfs_update_inode(trans, root, inode);
+ if (err)
+ goto out_fail;
+ err = btrfs_add_link(trans, dentry, inode);
+ if (err)
+ goto out_fail;
+ d_instantiate(dentry, inode);
+ drop_on_err = 0;
+ dir->i_sb->s_dirt = 1;
+ btrfs_update_inode_block_group(trans, inode);
+ btrfs_update_inode_block_group(trans, dir);
+
+out_fail:
+ btrfs_end_transaction(trans, root);
+out_unlock:
+ mutex_unlock(&root->fs_info->fs_mutex);
+ if (drop_on_err)
+ iput(inode);
+ btrfs_btree_balance_dirty(root);
+ return err;
+}
+
+/*
+ * FIBMAP and others want to pass in a fake buffer head. They need to
+ * use BTRFS_GET_BLOCK_NO_DIRECT to make sure we don't try to memcpy
+ * any packed file data into the fake bh
+ */
+#define BTRFS_GET_BLOCK_NO_CREATE 0
+#define BTRFS_GET_BLOCK_CREATE 1
+#define BTRFS_GET_BLOCK_NO_DIRECT 2
+
+/*
+ * FIXME create==1 doe not work.
+ */
+static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
+ struct buffer_head *result, int create)
+{
+ int ret;
+ int err = 0;
+ u64 blocknr;
+ u64 extent_start = 0;
+ u64 extent_end = 0;
+ u64 objectid = inode->i_ino;
+ u32 found_type;
+ u64 alloc_hint = 0;
+ struct btrfs_path *path;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_file_extent_item *item;
+ struct btrfs_leaf *leaf;
+ struct btrfs_disk_key *found_key;
+ struct btrfs_trans_handle *trans = NULL;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ btrfs_init_path(path);
+ if (create & BTRFS_GET_BLOCK_CREATE) {
+ WARN_ON(1);
+ /* this almost but not quite works */
+ trans = btrfs_start_transaction(root, 1);
+ if (!trans) {
+ err = -ENOMEM;
+ goto out;
+ }
+ ret = btrfs_drop_extents(trans, root, inode,
+ iblock << inode->i_blkbits,
+ (iblock + 1) << inode->i_blkbits,
+ &alloc_hint);
+ BUG_ON(ret);
+ }
+
+ ret = btrfs_lookup_file_extent(NULL, root, path,
+ inode->i_ino,
+ iblock << inode->i_blkbits, 0);
+ if (ret < 0) {
+ err = ret;
+ goto out;
+ }
+
+ if (ret != 0) {
+ if (path->slots[0] == 0) {
+ btrfs_release_path(root, path);
+ goto not_found;
+ }
+ path->slots[0]--;
+ }
+
+ item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
+ struct btrfs_file_extent_item);
+ leaf = btrfs_buffer_leaf(path->nodes[0]);
+ blocknr = btrfs_file_extent_disk_blocknr(item);
+ blocknr += btrfs_file_extent_offset(item);
+
+ /* are we inside the extent that was found? */
+ found_key = &leaf->items[path->slots[0]].key;
+ found_type = btrfs_disk_key_type(found_key);
+ if (btrfs_disk_key_objectid(found_key) != objectid ||
+ found_type != BTRFS_EXTENT_DATA_KEY) {
+ extent_end = 0;
+ extent_start = 0;
+ goto not_found;
+ }
+ found_type = btrfs_file_extent_type(item);
+ extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
+ if (found_type == BTRFS_FILE_EXTENT_REG) {
+ extent_start = extent_start >> inode->i_blkbits;
+ extent_end = extent_start + btrfs_file_extent_num_blocks(item);
+ err = 0;
+ if (btrfs_file_extent_disk_blocknr(item) == 0)
+ goto out;
+ if (iblock >= extent_start && iblock < extent_end) {
+ btrfs_map_bh_to_logical(root, result, blocknr +
+ iblock - extent_start);
+ goto out;
+ }
+ } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
+ char *ptr;
+ char *map;
+ u32 size;
+
+ if (create & BTRFS_GET_BLOCK_NO_DIRECT) {
+ err = -EINVAL;
+ goto out;
+ }
+ size = btrfs_file_extent_inline_len(leaf->items +
+ path->slots[0]);
+ extent_end = (extent_start + size) >> inode->i_blkbits;
+ extent_start >>= inode->i_blkbits;
+ if (iblock < extent_start || iblock > extent_end) {
+ goto not_found;
+ }
+ ptr = btrfs_file_extent_inline_start(item);
+ map = kmap(result->b_page);
+ memcpy(map, ptr, size);
+ memset(map + size, 0, PAGE_CACHE_SIZE - size);
+ flush_dcache_page(result->b_page);
+ kunmap(result->b_page);
+ set_buffer_uptodate(result);
+ SetPageChecked(result->b_page);
+ btrfs_map_bh_to_logical(root, result, 0);
+ }
+not_found:
+ if (create & BTRFS_GET_BLOCK_CREATE) {
+ struct btrfs_key ins;
+ ret = btrfs_alloc_extent(trans, root, inode->i_ino,
+ 1, alloc_hint, (u64)-1,
+ &ins, 1);
+ BUG_ON(ret);
+ ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
+ iblock << inode->i_blkbits,
+ ins.objectid, ins.offset,
+ ins.offset);
+ BUG_ON(ret);
+ SetPageChecked(result->b_page);
+ btrfs_map_bh_to_logical(root, result, ins.objectid);
+ }
+out:
+ if (trans)
+ err = btrfs_end_transaction(trans, root);
+ btrfs_free_path(path);
+ return err;
+}
+
+int btrfs_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *result, int create)
+{
+ int err;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ mutex_lock(&root->fs_info->fs_mutex);
+ err = btrfs_get_block_lock(inode, iblock, result, create);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return err;
+}
+
+static int btrfs_get_block_bmap(struct inode *inode, sector_t iblock,
+ struct buffer_head *result, int create)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ mutex_lock(&root->fs_info->fs_mutex);
+ btrfs_get_block_lock(inode, iblock, result, BTRFS_GET_BLOCK_NO_DIRECT);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return 0;
+}
+
+static sector_t btrfs_bmap(struct address_space *as, sector_t block)
+{
+ return generic_block_bmap(as, block, btrfs_get_block_bmap);
+}
+
+static int btrfs_prepare_write(struct file *file, struct page *page,
+ unsigned from, unsigned to)
+{
+ return block_prepare_write(page, from, to, btrfs_get_block);
+}
+
+static int btrfs_readpage(struct file *file, struct page *page)
+{
+ return mpage_readpage(page, btrfs_get_block);
+}
+
+/*
+ * Aside from a tiny bit of packed file data handling, this is the
+ * same as the generic code.
+ *
+ * While block_write_full_page is writing back the dirty buffers under
+ * the page lock, whoever dirtied the buffers may decide to clean them
+ * again at any time. We handle that by only looking at the buffer
+ * state inside lock_buffer().
+ *
+ * If block_write_full_page() is called for regular writeback
+ * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a
+ * locked buffer. This only can happen if someone has written the buffer
+ * directly, with submit_bh(). At the address_space level PageWriteback
+ * prevents this contention from occurring.
+ */
+static int __btrfs_write_full_page(struct inode *inode, struct page *page,
+ struct writeback_control *wbc)
+{
+ int err;
+ sector_t block;
+ sector_t last_block;
+ struct buffer_head *bh, *head;
+ const unsigned blocksize = 1 << inode->i_blkbits;
+ int nr_underway = 0;
+
+ BUG_ON(!PageLocked(page));
+
+ last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
+
+ if (!page_has_buffers(page)) {
+ create_empty_buffers(page, blocksize,
+ (1 << BH_Dirty)|(1 << BH_Uptodate));
+ }
+
+ /*
+ * Be very careful. We have no exclusion from __set_page_dirty_buffers
+ * here, and the (potentially unmapped) buffers may become dirty at
+ * any time. If a buffer becomes dirty here after we've inspected it
+ * then we just miss that fact, and the page stays dirty.
+ *
+ * Buffers outside i_size may be dirtied by __set_page_dirty_buffers;
+ * handle that here by just cleaning them.
+ */
+
+ block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+ head = page_buffers(page);
+ bh = head;
+
+ /*
+ * Get all the dirty buffers mapped to disk addresses and
+ * handle any aliases from the underlying blockdev's mapping.
+ */
+ do {
+ if (block > last_block) {
+ /*
+ * mapped buffers outside i_size will occur, because
+ * this page can be outside i_size when there is a
+ * truncate in progress.
+ */
+ /*
+ * The buffer was zeroed by block_write_full_page()
+ */
+ clear_buffer_dirty(bh);
+ set_buffer_uptodate(bh);
+ } else if (!buffer_mapped(bh) && buffer_dirty(bh)) {
+ WARN_ON(bh->b_size != blocksize);
+ err = btrfs_get_block(inode, block, bh, 0);
+ if (err) {
+ goto recover;
+ }
+ if (buffer_new(bh)) {
+ /* blockdev mappings never come here */
+ clear_buffer_new(bh);
+ }
+ }
+ bh = bh->b_this_page;
+ block++;
+ } while (bh != head);
+
+ do {
+ if (!buffer_mapped(bh))
+ continue;
+ /*
+ * If it's a fully non-blocking write attempt and we cannot
+ * lock the buffer then redirty the page. Note that this can
+ * potentially cause a busy-wait loop from pdflush and kswapd
+ * activity, but those code paths have their own higher-level
+ * throttling.
+ */
+ if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
+ lock_buffer(bh);
+ } else if (test_set_buffer_locked(bh)) {
+ redirty_page_for_writepage(wbc, page);
+ continue;
+ }
+ if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) {
+ mark_buffer_async_write(bh);
+ } else {
+ unlock_buffer(bh);
+ }
+ } while ((bh = bh->b_this_page) != head);
+
+ /*
+ * The page and its buffers are protected by PageWriteback(), so we can
+ * drop the bh refcounts early.
+ */
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+
+ do {
+ struct buffer_head *next = bh->b_this_page;
+ if (buffer_async_write(bh)) {
+ submit_bh(WRITE, bh);
+ nr_underway++;
+ }
+ bh = next;
+ } while (bh != head);
+ unlock_page(page);
+
+ err = 0;
+done:
+ if (nr_underway == 0) {
+ /*
+ * The page was marked dirty, but the buffers were
+ * clean. Someone wrote them back by hand with
+ * ll_rw_block/submit_bh. A rare case.
+ */
+ int uptodate = 1;
+ do {
+ if (!buffer_uptodate(bh)) {
+ uptodate = 0;
+ break;
+ }
+ bh = bh->b_this_page;
+ } while (bh != head);
+ if (uptodate)
+ SetPageUptodate(page);
+ end_page_writeback(page);
+ }
+ return err;
+
+recover:
+ /*
+ * ENOSPC, or some other error. We may already have added some
+ * blocks to the file, so we need to write these out to avoid
+ * exposing stale data.
+ * The page is currently locked and not marked for writeback
+ */
+ bh = head;
+ /* Recovery: lock and submit the mapped buffers */
+ do {
+ if (buffer_mapped(bh) && buffer_dirty(bh)) {
+ lock_buffer(bh);
+ mark_buffer_async_write(bh);
+ } else {
+ /*
+ * The buffer may have been set dirty during
+ * attachment to a dirty page.
+ */
+ clear_buffer_dirty(bh);
+ }
+ } while ((bh = bh->b_this_page) != head);
+ SetPageError(page);
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+ do {
+ struct buffer_head *next = bh->b_this_page;
+ if (buffer_async_write(bh)) {
+ clear_buffer_dirty(bh);
+ submit_bh(WRITE, bh);
+ nr_underway++;
+ }
+ bh = next;
+ } while (bh != head);
+ unlock_page(page);
+ goto done;
+}
+
+static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
+{
+ struct inode * const inode = page->mapping->host;
+ loff_t i_size = i_size_read(inode);
+ const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ unsigned offset;
+ void *kaddr;
+
+ /* Is the page fully inside i_size? */
+ if (page->index < end_index)
+ return __btrfs_write_full_page(inode, page, wbc);
+
+ /* Is the page fully outside i_size? (truncate in progress) */
+ offset = i_size & (PAGE_CACHE_SIZE-1);
+ if (page->index >= end_index+1 || !offset) {
+ /*
+ * The page may have dirty, unmapped buffers. For example,
+ * they may have been added in ext3_writepage(). Make them
+ * freeable here, so the page does not leak.
+ */
+ block_invalidatepage(page, 0);
+ unlock_page(page);
+ return 0; /* don't care */
+ }
+
+ /*
+ * The page straddles i_size. It must be zeroed out on each and every
+ * writepage invokation because it may be mmapped. "A file is mapped
+ * in multiples of the page size. For a file that is not a multiple of
+ * the page size, the remaining memory is zeroed when mapped, and
+ * writes to that region are not written out to the file."
+ */
+ kaddr = kmap_atomic(page, KM_USER0);
+ memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
+ flush_dcache_page(page);
+ kunmap_atomic(kaddr, KM_USER0);
+ return __btrfs_write_full_page(inode, page, wbc);
+}
+
+static void btrfs_truncate(struct inode *inode)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret;
+ struct btrfs_trans_handle *trans;
+
+ if (!S_ISREG(inode->i_mode))
+ return;
+ if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
+ return;
+
+ btrfs_truncate_page(inode->i_mapping, inode->i_size);
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+
+ /* FIXME, add redo link to tree so we don't leak on crash */
+ ret = btrfs_truncate_in_trans(trans, root, inode);
+ BUG_ON(ret);
+ btrfs_update_inode(trans, root, inode);
+ ret = btrfs_end_transaction(trans, root);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_btree_balance_dirty(root);
+}
+
+int btrfs_commit_write(struct file *file, struct page *page,
+ unsigned from, unsigned to)
+{
+ struct inode *inode = page->mapping->host;
+ struct buffer_head *bh;
+ loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
+
+ SetPageUptodate(page);
+ bh = page_buffers(page);
+ set_buffer_uptodate(bh);
+ if (buffer_mapped(bh) && bh->b_blocknr != 0) {
+ set_page_dirty(page);
+ }
+ if (pos > inode->i_size) {
+ i_size_write(inode, pos);
+ mark_inode_dirty(inode);
+ }
+ return 0;
+}
+
+static int create_subvol(struct btrfs_root *root, char *name, int namelen)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key key;
+ struct btrfs_root_item root_item;
+ struct btrfs_inode_item *inode_item;
+ struct buffer_head *subvol;
+ struct btrfs_leaf *leaf;
+ struct btrfs_root *new_root;
+ struct inode *inode;
+ struct inode *dir;
+ int ret;
+ u64 objectid;
+ u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ BUG_ON(!trans);
+
+ subvol = btrfs_alloc_free_block(trans, root, 0);
+ if (subvol == NULL)
+ return -ENOSPC;
+ leaf = btrfs_buffer_leaf(subvol);
+ btrfs_set_header_nritems(&leaf->header, 0);
+ btrfs_set_header_level(&leaf->header, 0);
+ btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol));
+ btrfs_set_header_generation(&leaf->header, trans->transid);
+ btrfs_set_header_owner(&leaf->header, root->root_key.objectid);
+ memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid,
+ sizeof(leaf->header.fsid));
+ mark_buffer_dirty(subvol);
+
+ inode_item = &root_item.inode;
+ memset(inode_item, 0, sizeof(*inode_item));
+ btrfs_set_inode_generation(inode_item, 1);
+ btrfs_set_inode_size(inode_item, 3);
+ btrfs_set_inode_nlink(inode_item, 1);
+ btrfs_set_inode_nblocks(inode_item, 1);
+ btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
+
+ btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol));
+ btrfs_set_root_refs(&root_item, 1);
+ brelse(subvol);
+ subvol = NULL;
+
+ ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
+ 0, &objectid);
+ BUG_ON(ret);
+
+ btrfs_set_root_dirid(&root_item, new_dirid);
+
+ key.objectid = objectid;
+ key.offset = 1;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
+ ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
+ &root_item);
+ BUG_ON(ret);
+
+ /*
+ * insert the directory item
+ */
+ key.offset = (u64)-1;
+ dir = root->fs_info->sb->s_root->d_inode;
+ ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
+ name, namelen, dir->i_ino, &key,
+ BTRFS_FT_DIR);
+ BUG_ON(ret);
+
+ ret = btrfs_commit_transaction(trans, root);
+ BUG_ON(ret);
+
+ new_root = btrfs_read_fs_root(root->fs_info, &key);
+ BUG_ON(!new_root);
+
+ trans = btrfs_start_transaction(new_root, 1);
+ BUG_ON(!trans);
+
+ inode = btrfs_new_inode(trans, new_root, new_dirid,
+ BTRFS_I(dir)->block_group, S_IFDIR | 0700);
+ inode->i_op = &btrfs_dir_inode_operations;
+ inode->i_fop = &btrfs_dir_file_operations;
+
+ ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid);
+ BUG_ON(ret);
+
+ inode->i_nlink = 1;
+ inode->i_size = 6;
+ ret = btrfs_update_inode(trans, new_root, inode);
+ BUG_ON(ret);
+
+ ret = btrfs_commit_transaction(trans, new_root);
+ BUG_ON(ret);
+
+ iput(inode);
+
+ mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_btree_balance_dirty(root);
+ return 0;
+}
+
+static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_key key;
+ struct btrfs_root_item new_root_item;
+ int ret;
+ u64 objectid;
+
+ if (!root->ref_cows)
+ return -EINVAL;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ BUG_ON(!trans);
+
+ ret = btrfs_update_inode(trans, root, root->inode);
+ BUG_ON(ret);
+
+ ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
+ 0, &objectid);
+ BUG_ON(ret);
+
+ memcpy(&new_root_item, &root->root_item,
+ sizeof(new_root_item));
+
+ key.objectid = objectid;
+ key.offset = 1;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
+ btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node));
+
+ ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
+ &new_root_item);
+ BUG_ON(ret);
+
+ /*
+ * insert the directory item
+ */
+ key.offset = (u64)-1;
+ ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
+ name, namelen,
+ root->fs_info->sb->s_root->d_inode->i_ino,
+ &key, BTRFS_FT_DIR);
+
+ BUG_ON(ret);
+
+ ret = btrfs_inc_root_ref(trans, root);
+ BUG_ON(ret);
+
+ ret = btrfs_commit_transaction(trans, root);
+ BUG_ON(ret);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_btree_balance_dirty(root);
+ return 0;
+}
+
+int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
+ cmd, unsigned long arg)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_ioctl_vol_args vol_args;
+ int ret = 0;
+ struct btrfs_dir_item *di;
+ int namelen;
+ struct btrfs_path *path;
+ u64 root_dirid;
+
+ switch (cmd) {
+ case BTRFS_IOC_SNAP_CREATE:
+ if (copy_from_user(&vol_args,
+ (struct btrfs_ioctl_vol_args __user *)arg,
+ sizeof(vol_args)))
+ return -EFAULT;
+ namelen = strlen(vol_args.name);
+ if (namelen > BTRFS_VOL_NAME_MAX)
+ return -EINVAL;
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
+ mutex_lock(&root->fs_info->fs_mutex);
+ di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
+ path, root_dirid,
+ vol_args.name, namelen, 0);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ btrfs_free_path(path);
+ if (di && !IS_ERR(di))
+ return -EEXIST;
+
+ if (root == root->fs_info->tree_root)
+ ret = create_subvol(root, vol_args.name, namelen);
+ else
+ ret = create_snapshot(root, vol_args.name, namelen);
+ WARN_ON(ret);
+ break;
+ default:
+ return -ENOTTY;
+ }
+ return ret;
+}
+
+#ifdef CONFIG_COMPAT
+long btrfs_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ int ret;
+ lock_kernel();
+ ret = btrfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
+ unlock_kernel();
+ return ret;
+
+}
+#endif
+
+/*
+ * Called inside transaction, so use GFP_NOFS
+ */
+struct inode *btrfs_alloc_inode(struct super_block *sb)
+{
+ struct btrfs_inode *ei;
+
+ ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+void btrfs_destroy_inode(struct inode *inode)
+{
+ WARN_ON(!list_empty(&inode->i_dentry));
+ WARN_ON(inode->i_data.nrpages);
+
+ kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
+}
+
+static void init_once(void * foo, struct kmem_cache * cachep,
+ unsigned long flags)
+{
+ struct btrfs_inode *ei = (struct btrfs_inode *) foo;
+
+ inode_init_once(&ei->vfs_inode);
+}
+
+void btrfs_destroy_cachep(void)
+{
+ if (btrfs_inode_cachep)
+ kmem_cache_destroy(btrfs_inode_cachep);
+ if (btrfs_trans_handle_cachep)
+ kmem_cache_destroy(btrfs_trans_handle_cachep);
+ if (btrfs_transaction_cachep)
+ kmem_cache_destroy(btrfs_transaction_cachep);
+ if (btrfs_bit_radix_cachep)
+ kmem_cache_destroy(btrfs_bit_radix_cachep);
+ if (btrfs_path_cachep)
+ kmem_cache_destroy(btrfs_path_cachep);
+}
+
+int btrfs_init_cachep(void)
+{
+ btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache",
+ sizeof(struct btrfs_inode),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ init_once, NULL);
+ if (!btrfs_inode_cachep)
+ goto fail;
+ btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache",
+ sizeof(struct btrfs_trans_handle),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL, NULL);
+ if (!btrfs_trans_handle_cachep)
+ goto fail;
+ btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache",
+ sizeof(struct btrfs_transaction),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL, NULL);
+ if (!btrfs_transaction_cachep)
+ goto fail;
+ btrfs_path_cachep = kmem_cache_create("btrfs_path_cache",
+ sizeof(struct btrfs_transaction),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ NULL, NULL);
+ if (!btrfs_path_cachep)
+ goto fail;
+ btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix",
+ 256,
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD |
+ SLAB_DESTROY_BY_RCU),
+ NULL, NULL);
+ if (!btrfs_bit_radix_cachep)
+ goto fail;
+ return 0;
+fail:
+ btrfs_destroy_cachep();
+ return -ENOMEM;
+}
+
+static int btrfs_getattr(struct vfsmount *mnt,
+ struct dentry *dentry, struct kstat *stat)
+{
+ struct inode *inode = dentry->d_inode;
+ generic_fillattr(inode, stat);
+ stat->blksize = 256 * 1024;
+ return 0;
+}
+
+static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
+ struct inode * new_dir,struct dentry *new_dentry)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(old_dir)->root;
+ struct inode *new_inode = new_dentry->d_inode;
+ struct inode *old_inode = old_dentry->d_inode;
+ struct timespec ctime = CURRENT_TIME;
+ struct btrfs_path *path;
+ struct btrfs_dir_item *di;
+ int ret;
+
+ if (S_ISDIR(old_inode->i_mode) && new_inode &&
+ new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
+ return -ENOTEMPTY;
+ }
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, new_dir);
+ path = btrfs_alloc_path();
+ if (!path) {
+ ret = -ENOMEM;
+ goto out_fail;
+ }
+
+ old_dentry->d_inode->i_nlink++;
+ old_dir->i_ctime = old_dir->i_mtime = ctime;
+ new_dir->i_ctime = new_dir->i_mtime = ctime;
+ old_inode->i_ctime = ctime;
+ if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
+ struct btrfs_key *location = &BTRFS_I(new_dir)->location;
+ u64 old_parent_oid;
+ di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino,
+ "..", 2, -1);
+ if (IS_ERR(di)) {
+ ret = PTR_ERR(di);
+ goto out_fail;
+ }
+ if (!di) {
+ ret = -ENOENT;
+ goto out_fail;
+ }
+ old_parent_oid = btrfs_disk_key_objectid(&di->location);
+ ret = btrfs_del_item(trans, root, path);
+ if (ret) {
+ ret = -EIO;
+ goto out_fail;
+ }
+ btrfs_release_path(root, path);
+
+ di = btrfs_lookup_dir_index_item(trans, root, path,
+ old_inode->i_ino,
+ old_parent_oid,
+ "..", 2, -1);
+ if (IS_ERR(di)) {
+ ret = PTR_ERR(di);
+ goto out_fail;
+ }
+ if (!di) {
+ ret = -ENOENT;
+ goto out_fail;
+ }
+ ret = btrfs_del_item(trans, root, path);
+ if (ret) {
+ ret = -EIO;
+ goto out_fail;
+ }
+ btrfs_release_path(root, path);
+
+ ret = btrfs_insert_dir_item(trans, root, "..", 2,
+ old_inode->i_ino, location,
+ BTRFS_FT_DIR);
+ if (ret)
+ goto out_fail;
+ }
+
+
+ ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
+ if (ret)
+ goto out_fail;
+
+ if (new_inode) {
+ new_inode->i_ctime = CURRENT_TIME;
+ ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
+ if (ret)
+ goto out_fail;
+ if (S_ISDIR(new_inode->i_mode))
+ clear_nlink(new_inode);
+ else
+ drop_nlink(new_inode);
+ btrfs_update_inode(trans, root, new_inode);
+ }
+ ret = btrfs_add_link(trans, new_dentry, old_inode);
+ if (ret)
+ goto out_fail;
+
+out_fail:
+ btrfs_free_path(path);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return ret;
+}
+
+static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
+ const char *symname)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct inode *inode;
+ int err;
+ int drop_inode = 0;
+ u64 objectid;
+ int name_len;
+ int datasize;
+ char *ptr;
+ struct btrfs_file_extent_item *ei;
+
+ name_len = strlen(symname) + 1;
+ if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
+ return -ENAMETOOLONG;
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, dir);
+
+ err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
+ if (err) {
+ err = -ENOSPC;
+ goto out_unlock;
+ }
+
+ inode = btrfs_new_inode(trans, root, objectid,
+ BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
+ err = PTR_ERR(inode);
+ if (IS_ERR(inode))
+ goto out_unlock;
+
+ btrfs_set_trans_block_group(trans, inode);
+ err = btrfs_add_nondir(trans, dentry, inode);
+ if (err)
+ drop_inode = 1;
+ else {
+ inode->i_mapping->a_ops = &btrfs_aops;
+ inode->i_fop = &btrfs_file_operations;
+ inode->i_op = &btrfs_file_inode_operations;
+ }
+ dir->i_sb->s_dirt = 1;
+ btrfs_update_inode_block_group(trans, inode);
+ btrfs_update_inode_block_group(trans, dir);
+ if (drop_inode)
+ goto out_unlock;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ key.objectid = inode->i_ino;
+ key.offset = 0;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
+ datasize = btrfs_file_extent_calc_inline_size(name_len);
+ err = btrfs_insert_empty_item(trans, root, path, &key,
+ datasize);
+ BUG_ON(err);
+ ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0], struct btrfs_file_extent_item);
+ btrfs_set_file_extent_generation(ei, trans->transid);
+ btrfs_set_file_extent_type(ei,
+ BTRFS_FILE_EXTENT_INLINE);
+ ptr = btrfs_file_extent_inline_start(ei);
+ btrfs_memcpy(root, path->nodes[0]->b_data,
+ ptr, symname, name_len);
+ mark_buffer_dirty(path->nodes[0]);
+ btrfs_free_path(path);
+ inode->i_op = &btrfs_symlink_inode_operations;
+ inode->i_mapping->a_ops = &btrfs_symlink_aops;
+ inode->i_size = name_len - 1;
+ btrfs_update_inode(trans, root, inode);
+ err = 0;
+
+out_unlock:
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ if (drop_inode) {
+ inode_dec_link_count(inode);
+ iput(inode);
+ }
+ btrfs_btree_balance_dirty(root);
+ return err;
+}
+
+static struct inode_operations btrfs_dir_inode_operations = {
+ .lookup = btrfs_lookup,
+ .create = btrfs_create,
+ .unlink = btrfs_unlink,
+ .link = btrfs_link,
+ .mkdir = btrfs_mkdir,
+ .rmdir = btrfs_rmdir,
+ .rename = btrfs_rename,
+ .symlink = btrfs_symlink,
+ .setattr = btrfs_setattr,
+};
+
+static struct inode_operations btrfs_dir_ro_inode_operations = {
+ .lookup = btrfs_lookup,
+};
+
+static struct file_operations btrfs_dir_file_operations = {
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .readdir = btrfs_readdir,
+ .ioctl = btrfs_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = btrfs_compat_ioctl,
+#endif
+};
+
+static struct address_space_operations btrfs_aops = {
+ .readpage = btrfs_readpage,
+ .writepage = btrfs_writepage,
+ .sync_page = block_sync_page,
+ .prepare_write = btrfs_prepare_write,
+ .commit_write = btrfs_commit_write,
+ .bmap = btrfs_bmap,
+};
+
+static struct address_space_operations btrfs_symlink_aops = {
+ .readpage = btrfs_readpage,
+ .writepage = btrfs_writepage,
+};
+
+static struct inode_operations btrfs_file_inode_operations = {
+ .truncate = btrfs_truncate,
+ .getattr = btrfs_getattr,
+ .setattr = btrfs_setattr,
+};
+
+static struct inode_operations btrfs_symlink_inode_operations = {
+ .readlink = generic_readlink,
+ .follow_link = page_follow_link_light,
+ .put_link = page_put_link,
+};
#include "ioctl.h"
#include "print-tree.h"
-struct btrfs_iget_args {
- u64 ino;
- struct btrfs_root *root;
-};
-
-#define BTRFS_SUPER_MAGIC 0x9123682E
-
-static struct inode_operations btrfs_dir_inode_operations;
-static struct inode_operations btrfs_symlink_inode_operations;
-static struct inode_operations btrfs_dir_ro_inode_operations;
-static struct super_operations btrfs_super_ops;
-static struct file_operations btrfs_dir_file_operations;
-static struct inode_operations btrfs_file_inode_operations;
-static struct address_space_operations btrfs_aops;
-static struct address_space_operations btrfs_symlink_aops;
-static struct file_operations btrfs_file_operations;
-
-static int drop_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *inode,
- u64 start, u64 end, u64 *hint_block);
-static int btrfs_get_block(struct inode *inode, sector_t iblock,
- struct buffer_head *result, int create);
-
-
-#define S_SHIFT 12
-static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
- [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
- [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
- [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
- [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
- [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
- [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
- [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
-};
-
-static void btrfs_read_locked_inode(struct inode *inode)
-{
- struct btrfs_path *path;
- struct btrfs_inode_item *inode_item;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_key location;
- u64 alloc_group_block;
- int ret;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- mutex_lock(&root->fs_info->fs_mutex);
-
- memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
- ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
- if (ret) {
- btrfs_free_path(path);
- goto make_bad;
- }
- inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_inode_item);
-
- inode->i_mode = btrfs_inode_mode(inode_item);
- inode->i_nlink = btrfs_inode_nlink(inode_item);
- inode->i_uid = btrfs_inode_uid(inode_item);
- inode->i_gid = btrfs_inode_gid(inode_item);
- inode->i_size = btrfs_inode_size(inode_item);
- inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
- inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
- inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
- inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
- inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
- inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
- inode->i_blocks = btrfs_inode_nblocks(inode_item);
- inode->i_generation = btrfs_inode_generation(inode_item);
- alloc_group_block = btrfs_inode_block_group(inode_item);
- BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
- alloc_group_block);
-
- btrfs_free_path(path);
- inode_item = NULL;
-
- mutex_unlock(&root->fs_info->fs_mutex);
-
- switch (inode->i_mode & S_IFMT) {
-#if 0
- default:
- init_special_inode(inode, inode->i_mode,
- btrfs_inode_rdev(inode_item));
- break;
-#endif
- case S_IFREG:
- inode->i_mapping->a_ops = &btrfs_aops;
- inode->i_fop = &btrfs_file_operations;
- inode->i_op = &btrfs_file_inode_operations;
- break;
- case S_IFDIR:
- inode->i_fop = &btrfs_dir_file_operations;
- if (root == root->fs_info->tree_root)
- inode->i_op = &btrfs_dir_ro_inode_operations;
- else
- inode->i_op = &btrfs_dir_inode_operations;
- break;
- case S_IFLNK:
- inode->i_op = &btrfs_symlink_inode_operations;
- inode->i_mapping->a_ops = &btrfs_symlink_aops;
- break;
- }
- return;
-
-make_bad:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- mutex_unlock(&root->fs_info->fs_mutex);
- make_bad_inode(inode);
-}
-
-static void fill_inode_item(struct btrfs_inode_item *item,
- struct inode *inode)
-{
- btrfs_set_inode_uid(item, inode->i_uid);
- btrfs_set_inode_gid(item, inode->i_gid);
- btrfs_set_inode_size(item, inode->i_size);
- btrfs_set_inode_mode(item, inode->i_mode);
- btrfs_set_inode_nlink(item, inode->i_nlink);
- btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
- btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
- btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
- btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
- btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
- btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
- btrfs_set_inode_nblocks(item, inode->i_blocks);
- btrfs_set_inode_generation(item, inode->i_generation);
- btrfs_set_inode_block_group(item,
- BTRFS_I(inode)->block_group->key.objectid);
-}
-
-static int btrfs_update_inode(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *inode)
-{
- struct btrfs_inode_item *inode_item;
- struct btrfs_path *path;
- int ret;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- ret = btrfs_lookup_inode(trans, root, path,
- &BTRFS_I(inode)->location, 1);
- if (ret) {
- if (ret > 0)
- ret = -ENOENT;
- goto failed;
- }
-
- inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_inode_item);
-
- fill_inode_item(inode_item, inode);
- btrfs_mark_buffer_dirty(path->nodes[0]);
- ret = 0;
-failed:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- return ret;
-}
-
-
-static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *dir,
- struct dentry *dentry)
-{
- struct btrfs_path *path;
- const char *name = dentry->d_name.name;
- int name_len = dentry->d_name.len;
- int ret = 0;
- u64 objectid;
- struct btrfs_dir_item *di;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
- name, name_len, -1);
- if (IS_ERR(di)) {
- ret = PTR_ERR(di);
- goto err;
- }
- if (!di) {
- ret = -ENOENT;
- goto err;
- }
- objectid = btrfs_disk_key_objectid(&di->location);
- ret = btrfs_delete_one_dir_name(trans, root, path, di);
- BUG_ON(ret);
- btrfs_release_path(root, path);
-
- di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
- objectid, name, name_len, -1);
- if (IS_ERR(di)) {
- ret = PTR_ERR(di);
- goto err;
- }
- if (!di) {
- ret = -ENOENT;
- goto err;
- }
- ret = btrfs_delete_one_dir_name(trans, root, path, di);
- BUG_ON(ret);
-
- dentry->d_inode->i_ctime = dir->i_ctime;
-err:
- btrfs_free_path(path);
- if (!ret) {
- dir->i_size -= name_len * 2;
- btrfs_update_inode(trans, root, dir);
- drop_nlink(dentry->d_inode);
- btrfs_update_inode(trans, root, dentry->d_inode);
- dir->i_sb->s_dirt = 1;
- }
- return ret;
-}
-
-static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
-{
- struct btrfs_root *root;
- struct btrfs_trans_handle *trans;
- int ret;
-
- root = BTRFS_I(dir)->root;
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, dir);
- ret = btrfs_unlink_trans(trans, root, dir, dentry);
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
- btrfs_btree_balance_dirty(root);
- return ret;
-}
-
-static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
-{
- struct inode *inode = dentry->d_inode;
- int err;
- int ret;
- struct btrfs_root *root = BTRFS_I(dir)->root;
- struct btrfs_path *path;
- struct btrfs_key key;
- struct btrfs_trans_handle *trans;
- struct btrfs_key found_key;
- int found_type;
- struct btrfs_leaf *leaf;
- char *goodnames = "..";
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, dir);
- key.objectid = inode->i_ino;
- key.offset = (u64)-1;
- key.flags = (u32)-1;
- while(1) {
- ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
- if (ret < 0) {
- err = ret;
- goto out;
- }
- BUG_ON(ret == 0);
- if (path->slots[0] == 0) {
- err = -ENOENT;
- goto out;
- }
- path->slots[0]--;
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- btrfs_disk_key_to_cpu(&found_key,
- &leaf->items[path->slots[0]].key);
- found_type = btrfs_key_type(&found_key);
- if (found_key.objectid != inode->i_ino) {
- err = -ENOENT;
- goto out;
- }
- if ((found_type != BTRFS_DIR_ITEM_KEY &&
- found_type != BTRFS_DIR_INDEX_KEY) ||
- (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
- !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
- err = -ENOTEMPTY;
- goto out;
- }
- ret = btrfs_del_item(trans, root, path);
- BUG_ON(ret);
-
- if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
- break;
- btrfs_release_path(root, path);
- }
- ret = 0;
- btrfs_release_path(root, path);
-
- /* now the directory is empty */
- err = btrfs_unlink_trans(trans, root, dir, dentry);
- if (!err) {
- inode->i_size = 0;
- }
-out:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- mutex_unlock(&root->fs_info->fs_mutex);
- ret = btrfs_end_transaction(trans, root);
- btrfs_btree_balance_dirty(root);
- if (ret && !err)
- err = ret;
- return err;
-}
-
-static int btrfs_free_inode(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *inode)
-{
- struct btrfs_path *path;
- int ret;
-
- clear_inode(inode);
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- ret = btrfs_lookup_inode(trans, root, path,
- &BTRFS_I(inode)->location, -1);
- BUG_ON(ret);
- ret = btrfs_del_item(trans, root, path);
- BUG_ON(ret);
- btrfs_free_path(path);
- return ret;
-}
-
-static void reada_truncate(struct btrfs_root *root, struct btrfs_path *path,
- u64 objectid)
-{
- struct btrfs_node *node;
- int i;
- int nritems;
- u64 item_objectid;
- u64 blocknr;
- int slot;
- int ret;
-
- if (!path->nodes[1])
- return;
- node = btrfs_buffer_node(path->nodes[1]);
- slot = path->slots[1];
- if (slot == 0)
- return;
- nritems = btrfs_header_nritems(&node->header);
- for (i = slot - 1; i >= 0; i--) {
- item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key);
- if (item_objectid != objectid)
- break;
- blocknr = btrfs_node_blockptr(node, i);
- ret = readahead_tree_block(root, blocknr);
- if (ret)
- break;
- }
-}
-
-static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *inode)
-{
- int ret;
- struct btrfs_path *path;
- struct btrfs_key key;
- struct btrfs_disk_key *found_key;
- u32 found_type;
- struct btrfs_leaf *leaf;
- struct btrfs_file_extent_item *fi;
- u64 extent_start = 0;
- u64 extent_num_blocks = 0;
- u64 item_end = 0;
- int found_extent;
- int del_item;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- /* FIXME, add redo link to tree so we don't leak on crash */
- key.objectid = inode->i_ino;
- key.offset = (u64)-1;
- key.flags = (u32)-1;
- while(1) {
- btrfs_init_path(path);
- fi = NULL;
- ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
- if (ret < 0) {
- goto error;
- }
- if (ret > 0) {
- BUG_ON(path->slots[0] == 0);
- path->slots[0]--;
- }
- reada_truncate(root, path, inode->i_ino);
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- found_key = &leaf->items[path->slots[0]].key;
- found_type = btrfs_disk_key_type(found_key);
- if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
- break;
- if (found_type != BTRFS_CSUM_ITEM_KEY &&
- found_type != BTRFS_DIR_ITEM_KEY &&
- found_type != BTRFS_DIR_INDEX_KEY &&
- found_type != BTRFS_EXTENT_DATA_KEY)
- break;
- item_end = btrfs_disk_key_offset(found_key);
- if (found_type == BTRFS_EXTENT_DATA_KEY) {
- fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_file_extent_item);
- if (btrfs_file_extent_type(fi) !=
- BTRFS_FILE_EXTENT_INLINE) {
- item_end += btrfs_file_extent_num_blocks(fi) <<
- inode->i_blkbits;
- }
- }
- if (found_type == BTRFS_CSUM_ITEM_KEY) {
- ret = btrfs_csum_truncate(trans, root, path,
- inode->i_size);
- BUG_ON(ret);
- }
- if (item_end < inode->i_size) {
- if (found_type) {
- btrfs_set_key_type(&key, found_type - 1);
- continue;
- }
- break;
- }
- if (btrfs_disk_key_offset(found_key) >= inode->i_size)
- del_item = 1;
- else
- del_item = 0;
- found_extent = 0;
-
- if (found_type == BTRFS_EXTENT_DATA_KEY &&
- btrfs_file_extent_type(fi) !=
- BTRFS_FILE_EXTENT_INLINE) {
- u64 num_dec;
- if (!del_item) {
- u64 orig_num_blocks =
- btrfs_file_extent_num_blocks(fi);
- extent_num_blocks = inode->i_size -
- btrfs_disk_key_offset(found_key) +
- root->blocksize - 1;
- extent_num_blocks >>= inode->i_blkbits;
- btrfs_set_file_extent_num_blocks(fi,
- extent_num_blocks);
- inode->i_blocks -= (orig_num_blocks -
- extent_num_blocks) << 3;
- mark_buffer_dirty(path->nodes[0]);
- } else {
- extent_start =
- btrfs_file_extent_disk_blocknr(fi);
- extent_num_blocks =
- btrfs_file_extent_disk_num_blocks(fi);
- /* FIXME blocksize != 4096 */
- num_dec = btrfs_file_extent_num_blocks(fi) << 3;
- if (extent_start != 0) {
- found_extent = 1;
- inode->i_blocks -= num_dec;
- }
- }
- }
- if (del_item) {
- ret = btrfs_del_item(trans, root, path);
- BUG_ON(ret);
- } else {
- break;
- }
- btrfs_release_path(root, path);
- if (found_extent) {
- ret = btrfs_free_extent(trans, root, extent_start,
- extent_num_blocks, 0);
- BUG_ON(ret);
- }
- }
- ret = 0;
-error:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- inode->i_sb->s_dirt = 1;
- return ret;
-}
-
-static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
-{
- struct inode *inode = mapping->host;
- unsigned blocksize = 1 << inode->i_blkbits;
- pgoff_t index = from >> PAGE_CACHE_SHIFT;
- unsigned offset = from & (PAGE_CACHE_SIZE-1);
- struct page *page;
- char *kaddr;
- int ret = 0;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- u64 alloc_hint;
- struct btrfs_key ins;
- struct btrfs_trans_handle *trans;
-
- if ((offset & (blocksize - 1)) == 0)
- goto out;
-
- ret = -ENOMEM;
- page = grab_cache_page(mapping, index);
- if (!page)
- goto out;
-
- if (!PageUptodate(page)) {
- ret = mpage_readpage(page, btrfs_get_block);
- lock_page(page);
- if (!PageUptodate(page)) {
- ret = -EIO;
- goto out;
- }
- }
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
-
- ret = drop_extents(trans, root, inode, page->index << PAGE_CACHE_SHIFT,
- (page->index + 1) << PAGE_CACHE_SHIFT, &alloc_hint);
- BUG_ON(ret);
- ret = btrfs_alloc_extent(trans, root, inode->i_ino, 1,
- alloc_hint, (u64)-1, &ins, 1);
- BUG_ON(ret);
- ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
- page->index << PAGE_CACHE_SHIFT,
- ins.objectid, 1, 1);
- BUG_ON(ret);
- SetPageChecked(page);
- kaddr = kmap(page);
- memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
- flush_dcache_page(page);
- btrfs_csum_file_block(trans, root, inode->i_ino,
- page->index << PAGE_CACHE_SHIFT,
- kaddr, PAGE_CACHE_SIZE);
- kunmap(page);
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
-
- set_page_dirty(page);
- unlock_page(page);
- page_cache_release(page);
-out:
- return ret;
-}
-
-static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
-{
- struct inode *inode = dentry->d_inode;
- int err;
-
- err = inode_change_ok(inode, attr);
- if (err)
- return err;
-
- if (S_ISREG(inode->i_mode) &&
- attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- u64 mask = root->blocksize - 1;
- u64 pos = (inode->i_size + mask) & ~mask;
- u64 hole_size;
-
- if (attr->ia_size <= pos)
- goto out;
-
- btrfs_truncate_page(inode->i_mapping, inode->i_size);
-
- hole_size = (attr->ia_size - pos + mask) & ~mask;
- hole_size >>= inode->i_blkbits;
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
- err = btrfs_insert_file_extent(trans, root, inode->i_ino,
- pos, 0, 0, hole_size);
- BUG_ON(err);
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
- }
-out:
- err = inode_setattr(inode, attr);
-
- return err;
-}
-static void btrfs_delete_inode(struct inode *inode)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- int ret;
-
- truncate_inode_pages(&inode->i_data, 0);
- if (is_bad_inode(inode)) {
- goto no_delete;
- }
- inode->i_size = 0;
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
- ret = btrfs_truncate_in_trans(trans, root, inode);
- BUG_ON(ret);
- btrfs_free_inode(trans, root, inode);
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
- btrfs_btree_balance_dirty(root);
- return;
-no_delete:
- clear_inode(inode);
-}
-
-static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
- struct btrfs_key *location)
-{
- const char *name = dentry->d_name.name;
- int namelen = dentry->d_name.len;
- struct btrfs_dir_item *di;
- struct btrfs_path *path;
- struct btrfs_root *root = BTRFS_I(dir)->root;
- int ret;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
- namelen, 0);
- if (!di || IS_ERR(di)) {
- location->objectid = 0;
- ret = 0;
- goto out;
- }
- btrfs_disk_key_to_cpu(location, &di->location);
-out:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- return ret;
-}
-
-static int fixup_tree_root_location(struct btrfs_root *root,
- struct btrfs_key *location,
- struct btrfs_root **sub_root)
-{
- struct btrfs_path *path;
- struct btrfs_root_item *ri;
-
- if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
- return 0;
- if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
- return 0;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- mutex_lock(&root->fs_info->fs_mutex);
-
- *sub_root = btrfs_read_fs_root(root->fs_info, location);
- if (IS_ERR(*sub_root))
- return PTR_ERR(*sub_root);
-
- ri = &(*sub_root)->root_item;
- location->objectid = btrfs_root_dirid(ri);
- location->flags = 0;
- btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
- location->offset = 0;
-
- btrfs_free_path(path);
- mutex_unlock(&root->fs_info->fs_mutex);
- return 0;
-}
-
-static int btrfs_init_locked_inode(struct inode *inode, void *p)
-{
- struct btrfs_iget_args *args = p;
- inode->i_ino = args->ino;
- BTRFS_I(inode)->root = args->root;
- return 0;
-}
-
-static int btrfs_find_actor(struct inode *inode, void *opaque)
-{
- struct btrfs_iget_args *args = opaque;
- return (args->ino == inode->i_ino &&
- args->root == BTRFS_I(inode)->root);
-}
-
-static struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
- struct btrfs_root *root)
-{
- struct inode *inode;
- struct btrfs_iget_args args;
- args.ino = objectid;
- args.root = root;
-
- inode = iget5_locked(s, objectid, btrfs_find_actor,
- btrfs_init_locked_inode,
- (void *)&args);
- return inode;
-}
-
-static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
- struct nameidata *nd)
-{
- struct inode * inode;
- struct btrfs_inode *bi = BTRFS_I(dir);
- struct btrfs_root *root = bi->root;
- struct btrfs_root *sub_root = root;
- struct btrfs_key location;
- int ret;
-
- if (dentry->d_name.len > BTRFS_NAME_LEN)
- return ERR_PTR(-ENAMETOOLONG);
- mutex_lock(&root->fs_info->fs_mutex);
- ret = btrfs_inode_by_name(dir, dentry, &location);
- mutex_unlock(&root->fs_info->fs_mutex);
- if (ret < 0)
- return ERR_PTR(ret);
- inode = NULL;
- if (location.objectid) {
- ret = fixup_tree_root_location(root, &location, &sub_root);
- if (ret < 0)
- return ERR_PTR(ret);
- if (ret > 0)
- return ERR_PTR(-ENOENT);
- inode = btrfs_iget_locked(dir->i_sb, location.objectid,
- sub_root);
- if (!inode)
- return ERR_PTR(-EACCES);
- if (inode->i_state & I_NEW) {
- if (sub_root != root) {
-printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root);
- igrab(inode);
- sub_root->inode = inode;
- }
- BTRFS_I(inode)->root = sub_root;
- memcpy(&BTRFS_I(inode)->location, &location,
- sizeof(location));
- btrfs_read_locked_inode(inode);
- unlock_new_inode(inode);
- }
- }
- return d_splice_alias(inode, dentry);
-}
-
-static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path,
- u64 objectid)
-{
- struct btrfs_node *node;
- int i;
- u32 nritems;
- u64 item_objectid;
- u64 blocknr;
- int slot;
- int ret;
-
- if (!path->nodes[1])
- return;
- node = btrfs_buffer_node(path->nodes[1]);
- slot = path->slots[1];
- nritems = btrfs_header_nritems(&node->header);
- for (i = slot + 1; i < nritems; i++) {
- item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key);
- if (item_objectid != objectid)
- break;
- blocknr = btrfs_node_blockptr(node, i);
- ret = readahead_tree_block(root, blocknr);
- if (ret)
- break;
- }
-}
-static unsigned char btrfs_filetype_table[] = {
- DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
-};
-
-static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
-{
- struct inode *inode = filp->f_path.dentry->d_inode;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_item *item;
- struct btrfs_dir_item *di;
- struct btrfs_key key;
- struct btrfs_path *path;
- int ret;
- u32 nritems;
- struct btrfs_leaf *leaf;
- int slot;
- int advance;
- unsigned char d_type;
- int over = 0;
- u32 di_cur;
- u32 di_total;
- u32 di_len;
- int key_type = BTRFS_DIR_INDEX_KEY;
-
- /* FIXME, use a real flag for deciding about the key type */
- if (root->fs_info->tree_root == root)
- key_type = BTRFS_DIR_ITEM_KEY;
- mutex_lock(&root->fs_info->fs_mutex);
- key.objectid = inode->i_ino;
- key.flags = 0;
- btrfs_set_key_type(&key, key_type);
- key.offset = filp->f_pos;
- path = btrfs_alloc_path();
- btrfs_init_path(path);
- ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
- if (ret < 0)
- goto err;
- advance = 0;
- reada_leaves(root, path, inode->i_ino);
- while(1) {
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- nritems = btrfs_header_nritems(&leaf->header);
- slot = path->slots[0];
- if (advance || slot >= nritems) {
- if (slot >= nritems -1) {
- reada_leaves(root, path, inode->i_ino);
- ret = btrfs_next_leaf(root, path);
- if (ret)
- break;
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- nritems = btrfs_header_nritems(&leaf->header);
- slot = path->slots[0];
- } else {
- slot++;
- path->slots[0]++;
- }
- }
- advance = 1;
- item = leaf->items + slot;
- if (btrfs_disk_key_objectid(&item->key) != key.objectid)
- break;
- if (btrfs_disk_key_type(&item->key) != key_type)
- break;
- if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
- continue;
- filp->f_pos = btrfs_disk_key_offset(&item->key);
- advance = 1;
- di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
- di_cur = 0;
- di_total = btrfs_item_size(leaf->items + slot);
- while(di_cur < di_total) {
- d_type = btrfs_filetype_table[btrfs_dir_type(di)];
- over = filldir(dirent, (const char *)(di + 1),
- btrfs_dir_name_len(di),
- btrfs_disk_key_offset(&item->key),
- btrfs_disk_key_objectid(&di->location),
- d_type);
- if (over)
- goto nopos;
- di_len = btrfs_dir_name_len(di) + sizeof(*di);
- di_cur += di_len;
- di = (struct btrfs_dir_item *)((char *)di + di_len);
- }
- }
- filp->f_pos++;
-nopos:
- ret = 0;
-err:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- mutex_unlock(&root->fs_info->fs_mutex);
- return ret;
-}
-
-static void btrfs_put_super (struct super_block * sb)
-{
- struct btrfs_root *root = btrfs_sb(sb);
- int ret;
-
- ret = close_ctree(root);
- if (ret) {
- printk("close ctree returns %d\n", ret);
- }
- sb->s_fs_info = NULL;
-}
-
-static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
-{
- struct inode * inode;
- struct dentry * root_dentry;
- struct btrfs_super_block *disk_super;
- struct btrfs_root *tree_root;
- struct btrfs_inode *bi;
-
- sb->s_maxbytes = MAX_LFS_FILESIZE;
- sb->s_magic = BTRFS_SUPER_MAGIC;
- sb->s_op = &btrfs_super_ops;
- sb->s_time_gran = 1;
-
- tree_root = open_ctree(sb);
-
- if (!tree_root) {
- printk("btrfs: open_ctree failed\n");
- return -EIO;
- }
- sb->s_fs_info = tree_root;
- disk_super = tree_root->fs_info->disk_super;
- printk("read in super total blocks %Lu root %Lu\n",
- btrfs_super_total_blocks(disk_super),
- btrfs_super_root_dir(disk_super));
-
- inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
- tree_root);
- bi = BTRFS_I(inode);
- bi->location.objectid = inode->i_ino;
- bi->location.offset = 0;
- bi->location.flags = 0;
- bi->root = tree_root;
- btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
-
- if (!inode)
- return -ENOMEM;
- if (inode->i_state & I_NEW) {
- btrfs_read_locked_inode(inode);
- unlock_new_inode(inode);
- }
-
- root_dentry = d_alloc_root(inode);
- if (!root_dentry) {
- iput(inode);
- return -ENOMEM;
- }
- sb->s_root = root_dentry;
- btrfs_transaction_queue_work(tree_root, HZ * 30);
- return 0;
-}
-
-static int btrfs_write_inode(struct inode *inode, int wait)
-{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_trans_handle *trans;
- int ret = 0;
-
- if (wait) {
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
- ret = btrfs_commit_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
- }
- return ret;
-}
-
-static void btrfs_dirty_inode(struct inode *inode)
-{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_trans_handle *trans;
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
- btrfs_update_inode(trans, root, inode);
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
- btrfs_btree_balance_dirty(root);
-}
-
-static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 objectid,
- struct btrfs_block_group_cache *group,
- int mode)
-{
- struct inode *inode;
- struct btrfs_inode_item inode_item;
- struct btrfs_key *location;
- int ret;
- int owner;
-
- inode = new_inode(root->fs_info->sb);
- if (!inode)
- return ERR_PTR(-ENOMEM);
-
- BTRFS_I(inode)->root = root;
- if (mode & S_IFDIR)
- owner = 0;
- else
- owner = 1;
- group = btrfs_find_block_group(root, group, 0, 0, owner);
- BTRFS_I(inode)->block_group = group;
-
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
- inode->i_mode = mode;
- inode->i_ino = objectid;
- inode->i_blocks = 0;
- inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
- fill_inode_item(&inode_item, inode);
- location = &BTRFS_I(inode)->location;
- location->objectid = objectid;
- location->flags = 0;
- location->offset = 0;
- btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
-
- ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
- BUG_ON(ret);
-
- insert_inode_hash(inode);
- return inode;
-}
-
-static inline u8 btrfs_inode_type(struct inode *inode)
-{
- return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
-}
-
-static int btrfs_add_link(struct btrfs_trans_handle *trans,
- struct dentry *dentry, struct inode *inode)
-{
- int ret;
- struct btrfs_key key;
- struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
- key.objectid = inode->i_ino;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
- key.offset = 0;
-
- ret = btrfs_insert_dir_item(trans, root,
- dentry->d_name.name, dentry->d_name.len,
- dentry->d_parent->d_inode->i_ino,
- &key, btrfs_inode_type(inode));
- if (ret == 0) {
- dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2;
- ret = btrfs_update_inode(trans, root,
- dentry->d_parent->d_inode);
- }
- return ret;
-}
-
-static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
- struct dentry *dentry, struct inode *inode)
-{
- int err = btrfs_add_link(trans, dentry, inode);
- if (!err) {
- d_instantiate(dentry, inode);
- return 0;
- }
- if (err > 0)
- err = -EEXIST;
- return err;
-}
-
-static int btrfs_create(struct inode *dir, struct dentry *dentry,
- int mode, struct nameidata *nd)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root = BTRFS_I(dir)->root;
- struct inode *inode;
- int err;
- int drop_inode = 0;
- u64 objectid;
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, dir);
-
- err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
- if (err) {
- err = -ENOSPC;
- goto out_unlock;
- }
-
- inode = btrfs_new_inode(trans, root, objectid,
- BTRFS_I(dir)->block_group, mode);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out_unlock;
-
- btrfs_set_trans_block_group(trans, inode);
- err = btrfs_add_nondir(trans, dentry, inode);
- if (err)
- drop_inode = 1;
- else {
- inode->i_mapping->a_ops = &btrfs_aops;
- inode->i_fop = &btrfs_file_operations;
- inode->i_op = &btrfs_file_inode_operations;
- }
- dir->i_sb->s_dirt = 1;
- btrfs_update_inode_block_group(trans, inode);
- btrfs_update_inode_block_group(trans, dir);
-out_unlock:
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
-
- if (drop_inode) {
- inode_dec_link_count(inode);
- iput(inode);
- }
- btrfs_btree_balance_dirty(root);
- return err;
-}
-
-static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
- struct dentry *dentry)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root = BTRFS_I(dir)->root;
- struct inode *inode = old_dentry->d_inode;
- int err;
- int drop_inode = 0;
-
- if (inode->i_nlink == 0)
- return -ENOENT;
-
- inc_nlink(inode);
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, dir);
- atomic_inc(&inode->i_count);
- err = btrfs_add_nondir(trans, dentry, inode);
- if (err)
- drop_inode = 1;
- dir->i_sb->s_dirt = 1;
- btrfs_update_inode_block_group(trans, dir);
- btrfs_update_inode(trans, root, inode);
-
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
-
- if (drop_inode) {
- inode_dec_link_count(inode);
- iput(inode);
- }
- btrfs_btree_balance_dirty(root);
- return err;
-}
-
-static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- u64 objectid, u64 dirid)
-{
- int ret;
- char buf[2];
- struct btrfs_key key;
-
- buf[0] = '.';
- buf[1] = '.';
-
- key.objectid = objectid;
- key.offset = 0;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
-
- ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
- &key, BTRFS_FT_DIR);
- if (ret)
- goto error;
- key.objectid = dirid;
- ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
- &key, BTRFS_FT_DIR);
- if (ret)
- goto error;
-error:
- return ret;
-}
-
-static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-{
- struct inode *inode;
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root = BTRFS_I(dir)->root;
- int err = 0;
- int drop_on_err = 0;
- u64 objectid;
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, dir);
- if (IS_ERR(trans)) {
- err = PTR_ERR(trans);
- goto out_unlock;
- }
-
- err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
- if (err) {
- err = -ENOSPC;
- goto out_unlock;
- }
-
- inode = btrfs_new_inode(trans, root, objectid,
- BTRFS_I(dir)->block_group, S_IFDIR | mode);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- goto out_fail;
- }
- drop_on_err = 1;
- inode->i_op = &btrfs_dir_inode_operations;
- inode->i_fop = &btrfs_dir_file_operations;
- btrfs_set_trans_block_group(trans, inode);
-
- err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
- if (err)
- goto out_fail;
-
- inode->i_size = 6;
- err = btrfs_update_inode(trans, root, inode);
- if (err)
- goto out_fail;
- err = btrfs_add_link(trans, dentry, inode);
- if (err)
- goto out_fail;
- d_instantiate(dentry, inode);
- drop_on_err = 0;
- dir->i_sb->s_dirt = 1;
- btrfs_update_inode_block_group(trans, inode);
- btrfs_update_inode_block_group(trans, dir);
-
-out_fail:
- btrfs_end_transaction(trans, root);
-out_unlock:
- mutex_unlock(&root->fs_info->fs_mutex);
- if (drop_on_err)
- iput(inode);
- btrfs_btree_balance_dirty(root);
- return err;
-}
-
-static int btrfs_sync_file(struct file *file,
- struct dentry *dentry, int datasync)
-{
- struct inode *inode = dentry->d_inode;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- int ret;
- struct btrfs_trans_handle *trans;
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- if (!trans) {
- ret = -ENOMEM;
- goto out;
- }
- ret = btrfs_commit_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
-out:
- return ret > 0 ? EIO : ret;
-}
-
-static int btrfs_sync_fs(struct super_block *sb, int wait)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root;
- int ret;
- root = btrfs_sb(sb);
-
- sb->s_dirt = 0;
- if (!wait) {
- filemap_flush(root->fs_info->btree_inode->i_mapping);
- return 0;
- }
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- ret = btrfs_commit_transaction(trans, root);
- sb->s_dirt = 0;
- BUG_ON(ret);
-printk("btrfs sync_fs\n");
- mutex_unlock(&root->fs_info->fs_mutex);
- return 0;
-}
-
-#define BTRFS_GET_BLOCK_NO_CREATE 0
-#define BTRFS_GET_BLOCK_CREATE 1
-#define BTRFS_GET_BLOCK_NO_DIRECT 2
-
-static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
- struct buffer_head *result, int create)
-{
- int ret;
- int err = 0;
- u64 blocknr;
- u64 extent_start = 0;
- u64 extent_end = 0;
- u64 objectid = inode->i_ino;
- u32 found_type;
- u64 alloc_hint = 0;
- struct btrfs_path *path;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_file_extent_item *item;
- struct btrfs_leaf *leaf;
- struct btrfs_disk_key *found_key;
- struct btrfs_trans_handle *trans = NULL;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- btrfs_init_path(path);
- if (create & BTRFS_GET_BLOCK_CREATE) {
- WARN_ON(1);
- /* this almost but not quite works */
- trans = btrfs_start_transaction(root, 1);
- if (!trans) {
- err = -ENOMEM;
- goto out;
- }
- ret = drop_extents(trans, root, inode,
- iblock << inode->i_blkbits,
- (iblock + 1) << inode->i_blkbits,
- &alloc_hint);
- BUG_ON(ret);
- }
-
- ret = btrfs_lookup_file_extent(NULL, root, path,
- inode->i_ino,
- iblock << inode->i_blkbits, 0);
- if (ret < 0) {
- err = ret;
- goto out;
- }
-
- if (ret != 0) {
- if (path->slots[0] == 0) {
- btrfs_release_path(root, path);
- goto not_found;
- }
- path->slots[0]--;
- }
-
- item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
- struct btrfs_file_extent_item);
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- blocknr = btrfs_file_extent_disk_blocknr(item);
- blocknr += btrfs_file_extent_offset(item);
-
- /* are we inside the extent that was found? */
- found_key = &leaf->items[path->slots[0]].key;
- found_type = btrfs_disk_key_type(found_key);
- if (btrfs_disk_key_objectid(found_key) != objectid ||
- found_type != BTRFS_EXTENT_DATA_KEY) {
- extent_end = 0;
- extent_start = 0;
- goto not_found;
- }
- found_type = btrfs_file_extent_type(item);
- extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
- if (found_type == BTRFS_FILE_EXTENT_REG) {
- extent_start = extent_start >> inode->i_blkbits;
- extent_end = extent_start + btrfs_file_extent_num_blocks(item);
- err = 0;
- if (btrfs_file_extent_disk_blocknr(item) == 0)
- goto out;
- if (iblock >= extent_start && iblock < extent_end) {
- btrfs_map_bh_to_logical(root, result, blocknr +
- iblock - extent_start);
- goto out;
- }
- } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
- char *ptr;
- char *map;
- u32 size;
-
- if (create & BTRFS_GET_BLOCK_NO_DIRECT) {
- err = -EINVAL;
- goto out;
- }
- size = btrfs_file_extent_inline_len(leaf->items +
- path->slots[0]);
- extent_end = (extent_start + size) >> inode->i_blkbits;
- extent_start >>= inode->i_blkbits;
- if (iblock < extent_start || iblock > extent_end) {
- goto not_found;
- }
- ptr = btrfs_file_extent_inline_start(item);
- map = kmap(result->b_page);
- memcpy(map, ptr, size);
- memset(map + size, 0, PAGE_CACHE_SIZE - size);
- flush_dcache_page(result->b_page);
- kunmap(result->b_page);
- set_buffer_uptodate(result);
- SetPageChecked(result->b_page);
- btrfs_map_bh_to_logical(root, result, 0);
- }
-not_found:
- if (create & BTRFS_GET_BLOCK_CREATE) {
- struct btrfs_key ins;
- ret = btrfs_alloc_extent(trans, root, inode->i_ino,
- 1, alloc_hint, (u64)-1,
- &ins, 1);
- BUG_ON(ret);
- ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
- iblock << inode->i_blkbits,
- ins.objectid, ins.offset,
- ins.offset);
- BUG_ON(ret);
- SetPageChecked(result->b_page);
- btrfs_map_bh_to_logical(root, result, ins.objectid);
- }
-out:
- if (trans)
- err = btrfs_end_transaction(trans, root);
- btrfs_free_path(path);
- return err;
-}
-
-static int btrfs_get_block(struct inode *inode, sector_t iblock,
- struct buffer_head *result, int create)
-{
- int err;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- mutex_lock(&root->fs_info->fs_mutex);
- err = btrfs_get_block_lock(inode, iblock, result, create);
- mutex_unlock(&root->fs_info->fs_mutex);
- return err;
-}
-
-static int btrfs_get_block_bmap(struct inode *inode, sector_t iblock,
- struct buffer_head *result, int create)
-{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- mutex_lock(&root->fs_info->fs_mutex);
- btrfs_get_block_lock(inode, iblock, result, BTRFS_GET_BLOCK_NO_DIRECT);
- mutex_unlock(&root->fs_info->fs_mutex);
- return 0;
-}
-
-static sector_t btrfs_bmap(struct address_space *as, sector_t block)
-{
- return generic_block_bmap(as, block, btrfs_get_block_bmap);
-}
-
-static int btrfs_prepare_write(struct file *file, struct page *page,
- unsigned from, unsigned to)
-{
- return block_prepare_write(page, from, to, btrfs_get_block);
-}
-
-static void btrfs_write_super(struct super_block *sb)
-{
- sb->s_dirt = 0;
-}
-
-static int btrfs_readpage(struct file *file, struct page *page)
-{
- return mpage_readpage(page, btrfs_get_block);
-}
-
-/*
- * While block_write_full_page is writing back the dirty buffers under
- * the page lock, whoever dirtied the buffers may decide to clean them
- * again at any time. We handle that by only looking at the buffer
- * state inside lock_buffer().
- *
- * If block_write_full_page() is called for regular writeback
- * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a
- * locked buffer. This only can happen if someone has written the buffer
- * directly, with submit_bh(). At the address_space level PageWriteback
- * prevents this contention from occurring.
- */
-static int __btrfs_write_full_page(struct inode *inode, struct page *page,
- struct writeback_control *wbc)
-{
- int err;
- sector_t block;
- sector_t last_block;
- struct buffer_head *bh, *head;
- const unsigned blocksize = 1 << inode->i_blkbits;
- int nr_underway = 0;
-
- BUG_ON(!PageLocked(page));
-
- last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
-
- if (!page_has_buffers(page)) {
- create_empty_buffers(page, blocksize,
- (1 << BH_Dirty)|(1 << BH_Uptodate));
- }
-
- /*
- * Be very careful. We have no exclusion from __set_page_dirty_buffers
- * here, and the (potentially unmapped) buffers may become dirty at
- * any time. If a buffer becomes dirty here after we've inspected it
- * then we just miss that fact, and the page stays dirty.
- *
- * Buffers outside i_size may be dirtied by __set_page_dirty_buffers;
- * handle that here by just cleaning them.
- */
-
- block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
- head = page_buffers(page);
- bh = head;
-
- /*
- * Get all the dirty buffers mapped to disk addresses and
- * handle any aliases from the underlying blockdev's mapping.
- */
- do {
- if (block > last_block) {
- /*
- * mapped buffers outside i_size will occur, because
- * this page can be outside i_size when there is a
- * truncate in progress.
- */
- /*
- * The buffer was zeroed by block_write_full_page()
- */
- clear_buffer_dirty(bh);
- set_buffer_uptodate(bh);
- } else if (!buffer_mapped(bh) && buffer_dirty(bh)) {
- WARN_ON(bh->b_size != blocksize);
- err = btrfs_get_block(inode, block, bh, 0);
- if (err) {
-printk("writepage going to recovery err %d\n", err);
- goto recover;
- }
- if (buffer_new(bh)) {
- /* blockdev mappings never come here */
- clear_buffer_new(bh);
- }
- }
- bh = bh->b_this_page;
- block++;
- } while (bh != head);
-
- do {
- if (!buffer_mapped(bh))
- continue;
- /*
- * If it's a fully non-blocking write attempt and we cannot
- * lock the buffer then redirty the page. Note that this can
- * potentially cause a busy-wait loop from pdflush and kswapd
- * activity, but those code paths have their own higher-level
- * throttling.
- */
- if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
- lock_buffer(bh);
- } else if (test_set_buffer_locked(bh)) {
- redirty_page_for_writepage(wbc, page);
- continue;
- }
- if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) {
- mark_buffer_async_write(bh);
- } else {
- unlock_buffer(bh);
- }
- } while ((bh = bh->b_this_page) != head);
-
- /*
- * The page and its buffers are protected by PageWriteback(), so we can
- * drop the bh refcounts early.
- */
- BUG_ON(PageWriteback(page));
- set_page_writeback(page);
-
- do {
- struct buffer_head *next = bh->b_this_page;
- if (buffer_async_write(bh)) {
- submit_bh(WRITE, bh);
- nr_underway++;
- }
- bh = next;
- } while (bh != head);
- unlock_page(page);
-
- err = 0;
-done:
- if (nr_underway == 0) {
- /*
- * The page was marked dirty, but the buffers were
- * clean. Someone wrote them back by hand with
- * ll_rw_block/submit_bh. A rare case.
- */
- int uptodate = 1;
- do {
- if (!buffer_uptodate(bh)) {
- uptodate = 0;
- break;
- }
- bh = bh->b_this_page;
- } while (bh != head);
- if (uptodate)
- SetPageUptodate(page);
- end_page_writeback(page);
- }
- return err;
-
-recover:
- /*
- * ENOSPC, or some other error. We may already have added some
- * blocks to the file, so we need to write these out to avoid
- * exposing stale data.
- * The page is currently locked and not marked for writeback
- */
- bh = head;
- /* Recovery: lock and submit the mapped buffers */
- do {
- if (buffer_mapped(bh) && buffer_dirty(bh)) {
- lock_buffer(bh);
- mark_buffer_async_write(bh);
- } else {
- /*
- * The buffer may have been set dirty during
- * attachment to a dirty page.
- */
- clear_buffer_dirty(bh);
- }
- } while ((bh = bh->b_this_page) != head);
- SetPageError(page);
- BUG_ON(PageWriteback(page));
- set_page_writeback(page);
- do {
- struct buffer_head *next = bh->b_this_page;
- if (buffer_async_write(bh)) {
- clear_buffer_dirty(bh);
- submit_bh(WRITE, bh);
- nr_underway++;
- }
- bh = next;
- } while (bh != head);
- unlock_page(page);
- goto done;
-}
-
-/*
- * The generic ->writepage function for buffer-backed address_spaces
- */
-static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
-{
- struct inode * const inode = page->mapping->host;
- loff_t i_size = i_size_read(inode);
- const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
- unsigned offset;
- void *kaddr;
-
- /* Is the page fully inside i_size? */
- if (page->index < end_index)
- return __btrfs_write_full_page(inode, page, wbc);
-
- /* Is the page fully outside i_size? (truncate in progress) */
- offset = i_size & (PAGE_CACHE_SIZE-1);
- if (page->index >= end_index+1 || !offset) {
- /*
- * The page may have dirty, unmapped buffers. For example,
- * they may have been added in ext3_writepage(). Make them
- * freeable here, so the page does not leak.
- */
- block_invalidatepage(page, 0);
- unlock_page(page);
- return 0; /* don't care */
- }
-
- /*
- * The page straddles i_size. It must be zeroed out on each and every
- * writepage invokation because it may be mmapped. "A file is mapped
- * in multiples of the page size. For a file that is not a multiple of
- * the page size, the remaining memory is zeroed when mapped, and
- * writes to that region are not written out to the file."
- */
- kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
- return __btrfs_write_full_page(inode, page, wbc);
-}
-
-static void btrfs_truncate(struct inode *inode)
-{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- int ret;
- struct btrfs_trans_handle *trans;
-
- if (!S_ISREG(inode->i_mode))
- return;
- if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
- return;
-
- btrfs_truncate_page(inode->i_mapping, inode->i_size);
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
-
- /* FIXME, add redo link to tree so we don't leak on crash */
- ret = btrfs_truncate_in_trans(trans, root, inode);
- BUG_ON(ret);
- btrfs_update_inode(trans, root, inode);
- ret = btrfs_end_transaction(trans, root);
- BUG_ON(ret);
- mutex_unlock(&root->fs_info->fs_mutex);
- btrfs_btree_balance_dirty(root);
-}
-
-static int btrfs_commit_write(struct file *file, struct page *page,
- unsigned from, unsigned to)
-{
- struct inode *inode = page->mapping->host;
- struct buffer_head *bh;
- loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
-
- SetPageUptodate(page);
- bh = page_buffers(page);
- set_buffer_uptodate(bh);
- if (buffer_mapped(bh) && bh->b_blocknr != 0) {
- set_page_dirty(page);
- }
- if (pos > inode->i_size) {
- i_size_write(inode, pos);
- mark_inode_dirty(inode);
- }
- return 0;
-}
-
-static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
- struct page **prepared_pages,
- const char __user * buf)
-{
- long page_fault = 0;
- int i;
- int offset = pos & (PAGE_CACHE_SIZE - 1);
-
- for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) {
- size_t count = min_t(size_t,
- PAGE_CACHE_SIZE - offset, write_bytes);
- struct page *page = prepared_pages[i];
- fault_in_pages_readable(buf, count);
-
- /* Copy data from userspace to the current page */
- kmap(page);
- page_fault = __copy_from_user(page_address(page) + offset,
- buf, count);
- /* Flush processor's dcache for this page */
- flush_dcache_page(page);
- kunmap(page);
- buf += count;
- write_bytes -= count;
-
- if (page_fault)
- break;
- }
- return page_fault ? -EFAULT : 0;
-}
-
-static void btrfs_drop_pages(struct page **pages, size_t num_pages)
-{
- size_t i;
- for (i = 0; i < num_pages; i++) {
- if (!pages[i])
- break;
- unlock_page(pages[i]);
- mark_page_accessed(pages[i]);
- page_cache_release(pages[i]);
- }
-}
-static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct file *file,
- struct page **pages,
- size_t num_pages,
- loff_t pos,
- size_t write_bytes)
-{
- int i;
- int offset;
- int err = 0;
- int ret;
- int this_write;
- struct inode *inode = file->f_path.dentry->d_inode;
- struct buffer_head *bh;
- struct btrfs_file_extent_item *ei;
-
- for (i = 0; i < num_pages; i++) {
- offset = pos & (PAGE_CACHE_SIZE -1);
- this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
- /* FIXME, one block at a time */
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
-
- bh = page_buffers(pages[i]);
- if (buffer_mapped(bh) && bh->b_blocknr == 0) {
- struct btrfs_key key;
- struct btrfs_path *path;
- char *ptr;
- u32 datasize;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- key.objectid = inode->i_ino;
- key.offset = pages[i]->index << PAGE_CACHE_SHIFT;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
- BUG_ON(write_bytes >= PAGE_CACHE_SIZE);
- datasize = offset +
- btrfs_file_extent_calc_inline_size(write_bytes);
- ret = btrfs_insert_empty_item(trans, root, path, &key,
- datasize);
- BUG_ON(ret);
- ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0], struct btrfs_file_extent_item);
- btrfs_set_file_extent_generation(ei, trans->transid);
- btrfs_set_file_extent_type(ei,
- BTRFS_FILE_EXTENT_INLINE);
- ptr = btrfs_file_extent_inline_start(ei);
- btrfs_memcpy(root, path->nodes[0]->b_data,
- ptr, bh->b_data, offset + write_bytes);
- mark_buffer_dirty(path->nodes[0]);
- btrfs_free_path(path);
- } else if (buffer_mapped(bh)) {
- btrfs_csum_file_block(trans, root, inode->i_ino,
- pages[i]->index << PAGE_CACHE_SHIFT,
- kmap(pages[i]), PAGE_CACHE_SIZE);
- kunmap(pages[i]);
- }
- SetPageChecked(pages[i]);
- // btrfs_update_inode_block_group(trans, inode);
- ret = btrfs_end_transaction(trans, root);
- BUG_ON(ret);
- mutex_unlock(&root->fs_info->fs_mutex);
+#define BTRFS_SUPER_MAGIC 0x9123682E
- ret = btrfs_commit_write(file, pages[i], offset,
- offset + this_write);
- pos += this_write;
- if (ret) {
- err = ret;
- goto failed;
- }
- WARN_ON(this_write > write_bytes);
- write_bytes -= this_write;
- }
-failed:
- return err;
-}
+static struct super_operations btrfs_super_ops;
-static int drop_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct inode *inode,
- u64 start, u64 end, u64 *hint_block)
+static void btrfs_put_super (struct super_block * sb)
{
+ struct btrfs_root *root = btrfs_sb(sb);
int ret;
- struct btrfs_key key;
- struct btrfs_leaf *leaf;
- int slot;
- struct btrfs_file_extent_item *extent;
- u64 extent_end = 0;
- int keep;
- struct btrfs_file_extent_item old;
- struct btrfs_path *path;
- u64 search_start = start;
- int bookend;
- int found_type;
- int found_extent;
- int found_inline;
-
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
- while(1) {
- btrfs_release_path(root, path);
- ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
- search_start, -1);
- if (ret < 0)
- goto out;
- if (ret > 0) {
- if (path->slots[0] == 0) {
- ret = 0;
- goto out;
- }
- path->slots[0]--;
- }
- keep = 0;
- bookend = 0;
- found_extent = 0;
- found_inline = 0;
- extent = NULL;
- leaf = btrfs_buffer_leaf(path->nodes[0]);
- slot = path->slots[0];
- btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
- if (key.offset >= end || key.objectid != inode->i_ino) {
- ret = 0;
- goto out;
- }
- if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) {
- ret = 0;
- goto out;
- }
- extent = btrfs_item_ptr(leaf, slot,
- struct btrfs_file_extent_item);
- found_type = btrfs_file_extent_type(extent);
- if (found_type == BTRFS_FILE_EXTENT_REG) {
- extent_end = key.offset +
- (btrfs_file_extent_num_blocks(extent) <<
- inode->i_blkbits);
- found_extent = 1;
- } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
- found_inline = 1;
- extent_end = key.offset +
- btrfs_file_extent_inline_len(leaf->items + slot);
- }
-
- if (!found_extent && !found_inline) {
- ret = 0;
- goto out;
- }
-
- if (search_start >= extent_end) {
- ret = 0;
- goto out;
- }
-
- if (found_inline) {
- u64 mask = root->blocksize - 1;
- search_start = (extent_end + mask) & ~mask;
- } else
- search_start = extent_end;
- if (end < extent_end && end >= key.offset) {
- if (found_extent) {
- u64 disk_blocknr =
- btrfs_file_extent_disk_blocknr(extent);
- u64 disk_num_blocks =
- btrfs_file_extent_disk_num_blocks(extent);
- memcpy(&old, extent, sizeof(old));
- if (disk_blocknr != 0) {
- ret = btrfs_inc_extent_ref(trans, root,
- disk_blocknr, disk_num_blocks);
- BUG_ON(ret);
- }
- }
- WARN_ON(found_inline);
- bookend = 1;
- }
-
- if (start > key.offset) {
- u64 new_num;
- u64 old_num;
- /* truncate existing extent */
- keep = 1;
- WARN_ON(start & (root->blocksize - 1));
- if (found_extent) {
- new_num = (start - key.offset) >>
- inode->i_blkbits;
- old_num = btrfs_file_extent_num_blocks(extent);
- *hint_block =
- btrfs_file_extent_disk_blocknr(extent);
- if (btrfs_file_extent_disk_blocknr(extent)) {
- inode->i_blocks -=
- (old_num - new_num) << 3;
- }
- btrfs_set_file_extent_num_blocks(extent,
- new_num);
- mark_buffer_dirty(path->nodes[0]);
- } else {
- WARN_ON(1);
- }
- }
- if (!keep) {
- u64 disk_blocknr = 0;
- u64 disk_num_blocks = 0;
- u64 extent_num_blocks = 0;
- if (found_extent) {
- disk_blocknr =
- btrfs_file_extent_disk_blocknr(extent);
- disk_num_blocks =
- btrfs_file_extent_disk_num_blocks(extent);
- extent_num_blocks =
- btrfs_file_extent_num_blocks(extent);
- *hint_block =
- btrfs_file_extent_disk_blocknr(extent);
- }
- ret = btrfs_del_item(trans, root, path);
- BUG_ON(ret);
- btrfs_release_path(root, path);
- extent = NULL;
- if (found_extent && disk_blocknr != 0) {
- inode->i_blocks -= extent_num_blocks << 3;
- ret = btrfs_free_extent(trans, root,
- disk_blocknr,
- disk_num_blocks, 0);
- }
-
- BUG_ON(ret);
- if (!bookend && search_start >= end) {
- ret = 0;
- goto out;
- }
- if (!bookend)
- continue;
- }
- if (bookend && found_extent) {
- /* create bookend */
- struct btrfs_key ins;
- ins.objectid = inode->i_ino;
- ins.offset = end;
- ins.flags = 0;
- btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
-
- btrfs_release_path(root, path);
- ret = btrfs_insert_empty_item(trans, root, path, &ins,
- sizeof(*extent));
- BUG_ON(ret);
- extent = btrfs_item_ptr(
- btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_file_extent_item);
- btrfs_set_file_extent_disk_blocknr(extent,
- btrfs_file_extent_disk_blocknr(&old));
- btrfs_set_file_extent_disk_num_blocks(extent,
- btrfs_file_extent_disk_num_blocks(&old));
-
- btrfs_set_file_extent_offset(extent,
- btrfs_file_extent_offset(&old) +
- ((end - key.offset) >> inode->i_blkbits));
- WARN_ON(btrfs_file_extent_num_blocks(&old) <
- (extent_end - end) >> inode->i_blkbits);
- btrfs_set_file_extent_num_blocks(extent,
- (extent_end - end) >> inode->i_blkbits);
-
- btrfs_set_file_extent_type(extent,
- BTRFS_FILE_EXTENT_REG);
- btrfs_set_file_extent_generation(extent,
- btrfs_file_extent_generation(&old));
- btrfs_mark_buffer_dirty(path->nodes[0]);
- if (btrfs_file_extent_disk_blocknr(&old) != 0) {
- inode->i_blocks +=
- btrfs_file_extent_num_blocks(extent) << 3;
- }
- ret = 0;
- goto out;
- }
- }
-out:
- btrfs_free_path(path);
- return ret;
-}
-
-static int prepare_pages(struct btrfs_root *root,
- struct file *file,
- struct page **pages,
- size_t num_pages,
- loff_t pos,
- unsigned long first_index,
- unsigned long last_index,
- size_t write_bytes,
- u64 alloc_extent_start)
-{
- int i;
- unsigned long index = pos >> PAGE_CACHE_SHIFT;
- struct inode *inode = file->f_path.dentry->d_inode;
- int offset;
- int err = 0;
- int this_write;
- struct buffer_head *bh;
- struct buffer_head *head;
- loff_t isize = i_size_read(inode);
-
- memset(pages, 0, num_pages * sizeof(struct page *));
-
- for (i = 0; i < num_pages; i++) {
- pages[i] = grab_cache_page(inode->i_mapping, index + i);
- if (!pages[i]) {
- err = -ENOMEM;
- goto failed_release;
- }
- cancel_dirty_page(pages[i], PAGE_CACHE_SIZE);
- wait_on_page_writeback(pages[i]);
- offset = pos & (PAGE_CACHE_SIZE -1);
- this_write = min(PAGE_CACHE_SIZE - offset, write_bytes);
- if (!page_has_buffers(pages[i])) {
- create_empty_buffers(pages[i],
- root->fs_info->sb->s_blocksize,
- (1 << BH_Uptodate));
- }
- head = page_buffers(pages[i]);
- bh = head;
- do {
- err = btrfs_map_bh_to_logical(root, bh,
- alloc_extent_start);
- BUG_ON(err);
- if (err)
- goto failed_truncate;
- bh = bh->b_this_page;
- if (alloc_extent_start)
- alloc_extent_start++;
- } while (bh != head);
- pos += this_write;
- WARN_ON(this_write > write_bytes);
- write_bytes -= this_write;
+ ret = close_ctree(root);
+ if (ret) {
+ printk("close ctree returns %d\n", ret);
}
- return 0;
-
-failed_release:
- btrfs_drop_pages(pages, num_pages);
- return err;
-
-failed_truncate:
- btrfs_drop_pages(pages, num_pages);
- if (pos > isize)
- vmtruncate(inode, isize);
- return err;
+ sb->s_fs_info = NULL;
}
-static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
+static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
{
- loff_t pos;
- size_t num_written = 0;
- int err = 0;
- int ret = 0;
- struct inode *inode = file->f_path.dentry->d_inode;
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct page *pages[8];
- struct page *pinned[2];
- unsigned long first_index;
- unsigned long last_index;
- u64 start_pos;
- u64 num_blocks;
- u64 alloc_extent_start;
- u64 hint_block;
- struct btrfs_trans_handle *trans;
- struct btrfs_key ins;
- pinned[0] = NULL;
- pinned[1] = NULL;
- if (file->f_flags & O_DIRECT)
- return -EINVAL;
- pos = *ppos;
- vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
- current->backing_dev_info = inode->i_mapping->backing_dev_info;
- err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
- if (err)
- goto out;
- if (count == 0)
- goto out;
- err = remove_suid(file->f_path.dentry);
- if (err)
- goto out;
- file_update_time(file);
+ struct inode * inode;
+ struct dentry * root_dentry;
+ struct btrfs_super_block *disk_super;
+ struct btrfs_root *tree_root;
+ struct btrfs_inode *bi;
+ int err;
- start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1);
- num_blocks = (count + pos - start_pos + root->blocksize - 1) >>
- inode->i_blkbits;
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_magic = BTRFS_SUPER_MAGIC;
+ sb->s_op = &btrfs_super_ops;
+ sb->s_time_gran = 1;
- mutex_lock(&inode->i_mutex);
- first_index = pos >> PAGE_CACHE_SHIFT;
- last_index = (pos + count) >> PAGE_CACHE_SHIFT;
+ tree_root = open_ctree(sb);
- if ((pos & (PAGE_CACHE_SIZE - 1))) {
- pinned[0] = grab_cache_page(inode->i_mapping, first_index);
- if (!PageUptodate(pinned[0])) {
- ret = mpage_readpage(pinned[0], btrfs_get_block);
- BUG_ON(ret);
- wait_on_page_locked(pinned[0]);
- } else {
- unlock_page(pinned[0]);
- }
- }
- if ((pos + count) & (PAGE_CACHE_SIZE - 1)) {
- pinned[1] = grab_cache_page(inode->i_mapping, last_index);
- if (!PageUptodate(pinned[1])) {
- ret = mpage_readpage(pinned[1], btrfs_get_block);
- BUG_ON(ret);
- wait_on_page_locked(pinned[1]);
- } else {
- unlock_page(pinned[1]);
- }
+ if (!tree_root || IS_ERR(tree_root)) {
+ printk("btrfs: open_ctree failed\n");
+ return -EIO;
}
+ sb->s_fs_info = tree_root;
+ disk_super = tree_root->fs_info->disk_super;
+ inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
+ tree_root);
+ bi = BTRFS_I(inode);
+ bi->location.objectid = inode->i_ino;
+ bi->location.offset = 0;
+ bi->location.flags = 0;
+ bi->root = tree_root;
+ btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- if (!trans) {
+ if (!inode) {
err = -ENOMEM;
- mutex_unlock(&root->fs_info->fs_mutex);
- goto out_unlock;
- }
- btrfs_set_trans_block_group(trans, inode);
- /* FIXME blocksize != 4096 */
- inode->i_blocks += num_blocks << 3;
- hint_block = 0;
- if (start_pos < inode->i_size) {
- /* FIXME blocksize != pagesize */
- ret = drop_extents(trans, root, inode,
- start_pos,
- (pos + count + root->blocksize -1) &
- ~((u64)root->blocksize - 1), &hint_block);
- BUG_ON(ret);
- }
- if (inode->i_size < start_pos) {
- u64 last_pos_in_file;
- u64 hole_size;
- u64 mask = root->blocksize - 1;
- last_pos_in_file = (inode->i_size + mask) & ~mask;
- hole_size = (start_pos - last_pos_in_file + mask) & ~mask;
- hole_size >>= inode->i_blkbits;
- if (last_pos_in_file < start_pos) {
- ret = btrfs_insert_file_extent(trans, root,
- inode->i_ino,
- last_pos_in_file,
- 0, 0, hole_size);
- }
- BUG_ON(ret);
- }
- if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size ||
- pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) {
- ret = btrfs_alloc_extent(trans, root, inode->i_ino,
- num_blocks, hint_block, (u64)-1,
- &ins, 1);
- BUG_ON(ret);
- ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
- start_pos, ins.objectid, ins.offset,
- ins.offset);
- BUG_ON(ret);
- } else {
- ins.offset = 0;
- ins.objectid = 0;
- }
- BUG_ON(ret);
- alloc_extent_start = ins.objectid;
- // btrfs_update_inode_block_group(trans, inode);
- ret = btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
-
- while(count > 0) {
- size_t offset = pos & (PAGE_CACHE_SIZE - 1);
- size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset);
- size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
- PAGE_CACHE_SHIFT;
-
- memset(pages, 0, sizeof(pages));
- ret = prepare_pages(root, file, pages, num_pages,
- pos, first_index, last_index,
- write_bytes, alloc_extent_start);
- BUG_ON(ret);
-
- /* FIXME blocks != pagesize */
- if (alloc_extent_start)
- alloc_extent_start += num_pages;
- ret = btrfs_copy_from_user(pos, num_pages,
- write_bytes, pages, buf);
- BUG_ON(ret);
-
- ret = dirty_and_release_pages(NULL, root, file, pages,
- num_pages, pos, write_bytes);
- BUG_ON(ret);
- btrfs_drop_pages(pages, num_pages);
-
- buf += write_bytes;
- count -= write_bytes;
- pos += write_bytes;
- num_written += write_bytes;
-
- balance_dirty_pages_ratelimited(inode->i_mapping);
- btrfs_btree_balance_dirty(root);
- cond_resched();
- }
-out_unlock:
- mutex_unlock(&inode->i_mutex);
-out:
- if (pinned[0])
- page_cache_release(pinned[0]);
- if (pinned[1])
- page_cache_release(pinned[1]);
- *ppos = pos;
- current->backing_dev_info = NULL;
- mark_inode_dirty(inode);
- return num_written ? num_written : err;
-}
-
-static int btrfs_read_actor(read_descriptor_t *desc, struct page *page,
- unsigned long offset, unsigned long size)
-{
- char *kaddr;
- unsigned long left, count = desc->count;
- struct inode *inode = page->mapping->host;
-
- if (size > count)
- size = count;
-
- if (!PageChecked(page)) {
- /* FIXME, do it per block */
- struct btrfs_root *root = BTRFS_I(inode)->root;
- int ret;
- struct buffer_head *bh;
-
- if (page_has_buffers(page)) {
- bh = page_buffers(page);
- if (!buffer_mapped(bh)) {
- SetPageChecked(page);
- goto checked;
- }
- }
-
- ret = btrfs_csum_verify_file_block(root,
- page->mapping->host->i_ino,
- page->index << PAGE_CACHE_SHIFT,
- kmap(page), PAGE_CACHE_SIZE);
- if (ret) {
- if (ret != -ENOENT) {
- printk("failed to verify ino %lu page %lu ret %d\n",
- page->mapping->host->i_ino,
- page->index, ret);
- memset(page_address(page), 1, PAGE_CACHE_SIZE);
- flush_dcache_page(page);
- }
- }
- SetPageChecked(page);
- kunmap(page);
- }
-checked:
- /*
- * Faults on the destination of a read are common, so do it before
- * taking the kmap.
- */
- if (!fault_in_pages_writeable(desc->arg.buf, size)) {
- kaddr = kmap_atomic(page, KM_USER0);
- left = __copy_to_user_inatomic(desc->arg.buf,
- kaddr + offset, size);
- kunmap_atomic(kaddr, KM_USER0);
- if (left == 0)
- goto success;
- }
-
- /* Do it the slow way */
- kaddr = kmap(page);
- left = __copy_to_user(desc->arg.buf, kaddr + offset, size);
- kunmap(page);
-
- if (left) {
- size -= left;
- desc->error = -EFAULT;
+ goto fail_close;
}
-success:
- desc->count = count - size;
- desc->written += size;
- desc->arg.buf += size;
- return size;
-}
-
-/**
- * btrfs_file_aio_read - filesystem read routine
- * @iocb: kernel I/O control block
- * @iov: io vector request
- * @nr_segs: number of segments in the iovec
- * @pos: current file position
- */
-static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
-{
- struct file *filp = iocb->ki_filp;
- ssize_t retval;
- unsigned long seg;
- size_t count;
- loff_t *ppos = &iocb->ki_pos;
-
- count = 0;
- for (seg = 0; seg < nr_segs; seg++) {
- const struct iovec *iv = &iov[seg];
-
- /*
- * If any segment has a negative length, or the cumulative
- * length ever wraps negative then return -EINVAL.
- */
- count += iv->iov_len;
- if (unlikely((ssize_t)(count|iv->iov_len) < 0))
- return -EINVAL;
- if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len))
- continue;
- if (seg == 0)
- return -EFAULT;
- nr_segs = seg;
- count -= iv->iov_len; /* This segment is no good */
- break;
+ if (inode->i_state & I_NEW) {
+ btrfs_read_locked_inode(inode);
+ unlock_new_inode(inode);
}
- retval = 0;
- if (count) {
- for (seg = 0; seg < nr_segs; seg++) {
- read_descriptor_t desc;
- desc.written = 0;
- desc.arg.buf = iov[seg].iov_base;
- desc.count = iov[seg].iov_len;
- if (desc.count == 0)
- continue;
- desc.error = 0;
- do_generic_file_read(filp, ppos, &desc,
- btrfs_read_actor);
- retval += desc.written;
- if (desc.error) {
- retval = retval ?: desc.error;
- break;
- }
- }
+ root_dentry = d_alloc_root(inode);
+ if (!root_dentry) {
+ iput(inode);
+ err = -ENOMEM;
+ goto fail_close;
}
- return retval;
-}
-
-static int create_subvol(struct btrfs_root *root, char *name, int namelen)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_key key;
- struct btrfs_root_item root_item;
- struct btrfs_inode_item *inode_item;
- struct buffer_head *subvol;
- struct btrfs_leaf *leaf;
- struct btrfs_root *new_root;
- struct inode *inode;
- struct inode *dir;
- int ret;
- u64 objectid;
- u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- BUG_ON(!trans);
-
- subvol = btrfs_alloc_free_block(trans, root, 0);
- if (subvol == NULL)
- return -ENOSPC;
- leaf = btrfs_buffer_leaf(subvol);
- btrfs_set_header_nritems(&leaf->header, 0);
- btrfs_set_header_level(&leaf->header, 0);
- btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol));
- btrfs_set_header_generation(&leaf->header, trans->transid);
- btrfs_set_header_owner(&leaf->header, root->root_key.objectid);
- memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid,
- sizeof(leaf->header.fsid));
- mark_buffer_dirty(subvol);
-
- inode_item = &root_item.inode;
- memset(inode_item, 0, sizeof(*inode_item));
- btrfs_set_inode_generation(inode_item, 1);
- btrfs_set_inode_size(inode_item, 3);
- btrfs_set_inode_nlink(inode_item, 1);
- btrfs_set_inode_nblocks(inode_item, 1);
- btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
-
- btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol));
- btrfs_set_root_refs(&root_item, 1);
- brelse(subvol);
- subvol = NULL;
-
- ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
- 0, &objectid);
- BUG_ON(ret);
-
- btrfs_set_root_dirid(&root_item, new_dirid);
-
- key.objectid = objectid;
- key.offset = 1;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
- ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
- &root_item);
- BUG_ON(ret);
-
- /*
- * insert the directory item
- */
- key.offset = (u64)-1;
- dir = root->fs_info->sb->s_root->d_inode;
- ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
- name, namelen, dir->i_ino, &key,
- BTRFS_FT_DIR);
- BUG_ON(ret);
-
- ret = btrfs_commit_transaction(trans, root);
- BUG_ON(ret);
-
- new_root = btrfs_read_fs_root(root->fs_info, &key);
- BUG_ON(!new_root);
-
- trans = btrfs_start_transaction(new_root, 1);
- BUG_ON(!trans);
-
- inode = btrfs_new_inode(trans, new_root, new_dirid,
- BTRFS_I(dir)->block_group, S_IFDIR | 0700);
- inode->i_op = &btrfs_dir_inode_operations;
- inode->i_fop = &btrfs_dir_file_operations;
-
- ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid);
- BUG_ON(ret);
-
- inode->i_nlink = 1;
- inode->i_size = 6;
- ret = btrfs_update_inode(trans, new_root, inode);
- BUG_ON(ret);
-
- ret = btrfs_commit_transaction(trans, new_root);
- BUG_ON(ret);
-
- iput(inode);
-
- mutex_unlock(&root->fs_info->fs_mutex);
- btrfs_btree_balance_dirty(root);
+ sb->s_root = root_dentry;
+ btrfs_transaction_queue_work(tree_root, HZ * 30);
return 0;
+
+fail_close:
+ close_ctree(tree_root);
+ return err;
}
-static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
+static int btrfs_sync_fs(struct super_block *sb, int wait)
{
struct btrfs_trans_handle *trans;
- struct btrfs_key key;
- struct btrfs_root_item new_root_item;
+ struct btrfs_root *root;
int ret;
- u64 objectid;
-
- if (!root->ref_cows)
- return -EINVAL;
+ root = btrfs_sb(sb);
+ sb->s_dirt = 0;
+ if (!wait) {
+ filemap_flush(root->fs_info->btree_inode->i_mapping);
+ return 0;
+ }
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
- BUG_ON(!trans);
-
- ret = btrfs_update_inode(trans, root, root->inode);
- BUG_ON(ret);
-
- ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
- 0, &objectid);
- BUG_ON(ret);
-
- memcpy(&new_root_item, &root->root_item,
- sizeof(new_root_item));
-
- key.objectid = objectid;
- key.offset = 1;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
- btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node));
-
- ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
- &new_root_item);
- BUG_ON(ret);
-
- /*
- * insert the directory item
- */
- key.offset = (u64)-1;
- ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
- name, namelen,
- root->fs_info->sb->s_root->d_inode->i_ino,
- &key, BTRFS_FT_DIR);
-
- BUG_ON(ret);
-
- ret = btrfs_inc_root_ref(trans, root);
- BUG_ON(ret);
-
ret = btrfs_commit_transaction(trans, root);
+ sb->s_dirt = 0;
BUG_ON(ret);
mutex_unlock(&root->fs_info->fs_mutex);
- btrfs_btree_balance_dirty(root);
- return 0;
-}
-
-static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
- cmd, unsigned long arg)
-{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_ioctl_vol_args vol_args;
- int ret = 0;
- struct btrfs_dir_item *di;
- int namelen;
- struct btrfs_path *path;
- u64 root_dirid;
-
- switch (cmd) {
- case BTRFS_IOC_SNAP_CREATE:
- if (copy_from_user(&vol_args,
- (struct btrfs_ioctl_vol_args __user *)arg,
- sizeof(vol_args)))
- return -EFAULT;
- namelen = strlen(vol_args.name);
- if (namelen > BTRFS_VOL_NAME_MAX)
- return -EINVAL;
- path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
- root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
- mutex_lock(&root->fs_info->fs_mutex);
- di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
- path, root_dirid,
- vol_args.name, namelen, 0);
- mutex_unlock(&root->fs_info->fs_mutex);
- btrfs_free_path(path);
- if (di && !IS_ERR(di))
- return -EEXIST;
-
- if (root == root->fs_info->tree_root)
- ret = create_subvol(root, vol_args.name, namelen);
- else
- ret = create_snapshot(root, vol_args.name, namelen);
- WARN_ON(ret);
- break;
- default:
- return -ENOTTY;
- }
- return ret;
-}
-
-#ifdef CONFIG_COMPAT
-static long btrfs_compat_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- struct inode *inode = file->f_path.dentry->d_inode;
- int ret;
- lock_kernel();
- ret = btrfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
- unlock_kernel();
- return ret;
-
-}
-#endif
-
-static struct kmem_cache *btrfs_inode_cachep;
-struct kmem_cache *btrfs_trans_handle_cachep;
-struct kmem_cache *btrfs_transaction_cachep;
-struct kmem_cache *btrfs_bit_radix_cachep;
-struct kmem_cache *btrfs_path_cachep;
-
-/*
- * Called inside transaction, so use GFP_NOFS
- */
-static struct inode *btrfs_alloc_inode(struct super_block *sb)
-{
- struct btrfs_inode *ei;
-
- ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
- if (!ei)
- return NULL;
- return &ei->vfs_inode;
-}
-
-static void btrfs_destroy_inode(struct inode *inode)
-{
- WARN_ON(!list_empty(&inode->i_dentry));
- WARN_ON(inode->i_data.nrpages);
-
- kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
-}
-
-static void init_once(void * foo, struct kmem_cache * cachep,
- unsigned long flags)
-{
- struct btrfs_inode *ei = (struct btrfs_inode *) foo;
-
- if ((flags & (SLAB_CTOR_CONSTRUCTOR)) ==
- SLAB_CTOR_CONSTRUCTOR) {
- inode_init_once(&ei->vfs_inode);
- }
-}
-
-static int init_inodecache(void)
-{
- btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache",
- sizeof(struct btrfs_inode),
- 0, (SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD),
- init_once, NULL);
- btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache",
- sizeof(struct btrfs_trans_handle),
- 0, (SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD),
- NULL, NULL);
- btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache",
- sizeof(struct btrfs_transaction),
- 0, (SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD),
- NULL, NULL);
- btrfs_path_cachep = kmem_cache_create("btrfs_path_cache",
- sizeof(struct btrfs_transaction),
- 0, (SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD),
- NULL, NULL);
- btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix",
- 256,
- 0, (SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD |
- SLAB_DESTROY_BY_RCU),
- NULL, NULL);
- if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL ||
- btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL)
- return -ENOMEM;
return 0;
}
-static void destroy_inodecache(void)
+static void btrfs_write_super(struct super_block *sb)
{
- kmem_cache_destroy(btrfs_inode_cachep);
- kmem_cache_destroy(btrfs_trans_handle_cachep);
- kmem_cache_destroy(btrfs_transaction_cachep);
- kmem_cache_destroy(btrfs_bit_radix_cachep);
- kmem_cache_destroy(btrfs_path_cachep);
+ sb->s_dirt = 0;
}
static int btrfs_get_sb(struct file_system_type *fs_type,
btrfs_fill_super, mnt);
}
-static int btrfs_getattr(struct vfsmount *mnt,
- struct dentry *dentry, struct kstat *stat)
-{
- struct inode *inode = dentry->d_inode;
- generic_fillattr(inode, stat);
- stat->blksize = 256 * 1024;
- return 0;
-}
-
static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct btrfs_root *root = btrfs_sb(dentry->d_sb);
return 0;
}
-static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
- struct inode * new_dir,struct dentry *new_dentry)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root = BTRFS_I(old_dir)->root;
- struct inode *new_inode = new_dentry->d_inode;
- struct inode *old_inode = old_dentry->d_inode;
- struct timespec ctime = CURRENT_TIME;
- struct btrfs_path *path;
- struct btrfs_dir_item *di;
- int ret;
-
- if (S_ISDIR(old_inode->i_mode) && new_inode &&
- new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
- return -ENOTEMPTY;
- }
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, new_dir);
- path = btrfs_alloc_path();
- if (!path) {
- ret = -ENOMEM;
- goto out_fail;
- }
-
- old_dentry->d_inode->i_nlink++;
- old_dir->i_ctime = old_dir->i_mtime = ctime;
- new_dir->i_ctime = new_dir->i_mtime = ctime;
- old_inode->i_ctime = ctime;
- if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
- struct btrfs_key *location = &BTRFS_I(new_dir)->location;
- u64 old_parent_oid;
- di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino,
- "..", 2, -1);
- if (IS_ERR(di)) {
- ret = PTR_ERR(di);
- goto out_fail;
- }
- if (!di) {
- ret = -ENOENT;
- goto out_fail;
- }
- old_parent_oid = btrfs_disk_key_objectid(&di->location);
- ret = btrfs_del_item(trans, root, path);
- if (ret) {
- ret = -EIO;
- goto out_fail;
- }
- btrfs_release_path(root, path);
-
- di = btrfs_lookup_dir_index_item(trans, root, path,
- old_inode->i_ino,
- old_parent_oid,
- "..", 2, -1);
- if (IS_ERR(di)) {
- ret = PTR_ERR(di);
- goto out_fail;
- }
- if (!di) {
- ret = -ENOENT;
- goto out_fail;
- }
- ret = btrfs_del_item(trans, root, path);
- if (ret) {
- ret = -EIO;
- goto out_fail;
- }
- btrfs_release_path(root, path);
-
- ret = btrfs_insert_dir_item(trans, root, "..", 2,
- old_inode->i_ino, location,
- BTRFS_FT_DIR);
- if (ret)
- goto out_fail;
- }
-
-
- ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
- if (ret)
- goto out_fail;
-
- if (new_inode) {
- new_inode->i_ctime = CURRENT_TIME;
- ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
- if (ret)
- goto out_fail;
- if (S_ISDIR(new_inode->i_mode))
- clear_nlink(new_inode);
- else
- drop_nlink(new_inode);
- btrfs_update_inode(trans, root, new_inode);
- }
- ret = btrfs_add_link(trans, new_dentry, old_inode);
- if (ret)
- goto out_fail;
-
-out_fail:
- btrfs_free_path(path);
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
- return ret;
-}
-
-static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
- const char *symname)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_root *root = BTRFS_I(dir)->root;
- struct btrfs_path *path;
- struct btrfs_key key;
- struct inode *inode;
- int err;
- int drop_inode = 0;
- u64 objectid;
- int name_len;
- int datasize;
- char *ptr;
- struct btrfs_file_extent_item *ei;
-
- name_len = strlen(symname) + 1;
- if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
- return -ENAMETOOLONG;
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, dir);
-
- err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
- if (err) {
- err = -ENOSPC;
- goto out_unlock;
- }
-
- inode = btrfs_new_inode(trans, root, objectid,
- BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out_unlock;
-
- btrfs_set_trans_block_group(trans, inode);
- err = btrfs_add_nondir(trans, dentry, inode);
- if (err)
- drop_inode = 1;
- else {
- inode->i_mapping->a_ops = &btrfs_aops;
- inode->i_fop = &btrfs_file_operations;
- inode->i_op = &btrfs_file_inode_operations;
- }
- dir->i_sb->s_dirt = 1;
- btrfs_update_inode_block_group(trans, inode);
- btrfs_update_inode_block_group(trans, dir);
- if (drop_inode)
- goto out_unlock;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- key.objectid = inode->i_ino;
- key.offset = 0;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
- datasize = btrfs_file_extent_calc_inline_size(name_len);
- err = btrfs_insert_empty_item(trans, root, path, &key,
- datasize);
- BUG_ON(err);
- ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0], struct btrfs_file_extent_item);
- btrfs_set_file_extent_generation(ei, trans->transid);
- btrfs_set_file_extent_type(ei,
- BTRFS_FILE_EXTENT_INLINE);
- ptr = btrfs_file_extent_inline_start(ei);
- btrfs_memcpy(root, path->nodes[0]->b_data,
- ptr, symname, name_len);
- mark_buffer_dirty(path->nodes[0]);
- btrfs_free_path(path);
- inode->i_op = &btrfs_symlink_inode_operations;
- inode->i_mapping->a_ops = &btrfs_symlink_aops;
- inode->i_size = name_len - 1;
- btrfs_update_inode(trans, root, inode);
- err = 0;
-
-out_unlock:
- btrfs_end_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
-
- if (drop_inode) {
- inode_dec_link_count(inode);
- iput(inode);
- }
- btrfs_btree_balance_dirty(root);
- return err;
-}
-
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
.statfs = btrfs_statfs,
};
-static struct inode_operations btrfs_dir_inode_operations = {
- .lookup = btrfs_lookup,
- .create = btrfs_create,
- .unlink = btrfs_unlink,
- .link = btrfs_link,
- .mkdir = btrfs_mkdir,
- .rmdir = btrfs_rmdir,
- .rename = btrfs_rename,
- .symlink = btrfs_symlink,
- .setattr = btrfs_setattr,
-};
-
-static struct inode_operations btrfs_dir_ro_inode_operations = {
- .lookup = btrfs_lookup,
-};
-
-static struct file_operations btrfs_dir_file_operations = {
- .llseek = generic_file_llseek,
- .read = generic_read_dir,
- .readdir = btrfs_readdir,
- .ioctl = btrfs_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = btrfs_compat_ioctl,
-#endif
-};
-
-static struct address_space_operations btrfs_aops = {
- .readpage = btrfs_readpage,
- .writepage = btrfs_writepage,
- .sync_page = block_sync_page,
- .prepare_write = btrfs_prepare_write,
- .commit_write = btrfs_commit_write,
- .bmap = btrfs_bmap,
-};
-
-static struct address_space_operations btrfs_symlink_aops = {
- .readpage = btrfs_readpage,
- .writepage = btrfs_writepage,
-};
-
-static struct inode_operations btrfs_file_inode_operations = {
- .truncate = btrfs_truncate,
- .getattr = btrfs_getattr,
- .setattr = btrfs_setattr,
-};
-
-static struct file_operations btrfs_file_operations = {
- .llseek = generic_file_llseek,
- .read = do_sync_read,
- .aio_read = btrfs_file_aio_read,
- .write = btrfs_file_write,
- .mmap = generic_file_mmap,
- .open = generic_file_open,
- .ioctl = btrfs_ioctl,
- .fsync = btrfs_sync_file,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = btrfs_compat_ioctl,
-#endif
-};
-
-static struct inode_operations btrfs_symlink_inode_operations = {
- .readlink = generic_readlink,
- .follow_link = page_follow_link_light,
- .put_link = page_put_link,
-};
-
static int __init init_btrfs_fs(void)
{
int err;
- printk("btrfs loaded!\n");
btrfs_init_transaction_sys();
- err = init_inodecache();
+ err = btrfs_init_cachep();
if (err)
return err;
return register_filesystem(&btrfs_fs_type);
- destroy_inodecache();
- return err;
}
static void __exit exit_btrfs_fs(void)
{
btrfs_exit_transaction_sys();
- destroy_inodecache();
+ btrfs_destroy_cachep();
unregister_filesystem(&btrfs_fs_type);
- printk("btrfs unloaded\n");
}
module_init(init_btrfs_fs)
projects / platform / kernel / linux-rpi.git / commitdiff