#include "disk-io.h"
#include "transaction.h"
#include "print-tree.h"
+#include "repair.h"
+#include "internal.h"
+#include "sizes.h"
+#include "messages.h"
static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int level);
struct btrfs_path *path, int data_size, int extend);
static int push_node_left(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *dst,
- struct extent_buffer *src);
+ struct extent_buffer *src, int empty);
static int balance_node_right(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *dst_buf,
struct extent_buffer *src_buf);
-static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct btrfs_path *path, int level, int slot);
inline void btrfs_init_path(struct btrfs_path *p)
{
struct btrfs_path *btrfs_alloc_path(void)
{
struct btrfs_path *path;
- path = kmalloc(sizeof(struct btrfs_path), GFP_NOFS);
- if (path) {
- btrfs_init_path(path);
- path->reada = 0;
- }
+ path = kzalloc(sizeof(struct btrfs_path), GFP_NOFS);
return path;
}
void btrfs_free_path(struct btrfs_path *p)
{
- btrfs_release_path(NULL, p);
+ if (!p)
+ return;
+ btrfs_release_path(p);
kfree(p);
}
-void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p)
+void btrfs_release_path(struct btrfs_path *p)
{
int i;
for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
if (!p->nodes[i])
- break;
+ continue;
free_extent_buffer(p->nodes[i]);
}
memset(p, 0, sizeof(*p));
}
+void add_root_to_dirty_list(struct btrfs_root *root)
+{
+ if (root->track_dirty && list_empty(&root->dirty_list)) {
+ list_add(&root->dirty_list,
+ &root->fs_info->dirty_cowonly_roots);
+ }
+}
+
int btrfs_copy_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *buf,
struct extent_buffer **cow_ret, u64 new_root_objectid)
{
struct extent_buffer *cow;
- u32 nritems;
int ret = 0;
int level;
- struct btrfs_key first_key;
struct btrfs_root *new_root;
+ struct btrfs_disk_key disk_key;
new_root = kmalloc(sizeof(*new_root), GFP_NOFS);
if (!new_root)
WARN_ON(root->ref_cows && trans->transid != root->last_trans);
level = btrfs_header_level(buf);
- nritems = btrfs_header_nritems(buf);
- if (nritems) {
- if (level == 0)
- btrfs_item_key_to_cpu(buf, &first_key, 0);
- else
- btrfs_node_key_to_cpu(buf, &first_key, 0);
- } else {
- first_key.objectid = 0;
- }
- cow = __btrfs_alloc_free_block(trans, new_root, buf->len,
- new_root_objectid,
- trans->transid, first_key.objectid,
- level, buf->start, 0);
+ if (level == 0)
+ btrfs_item_key(buf, &disk_key, 0);
+ else
+ btrfs_node_key(buf, &disk_key, 0);
+ cow = btrfs_alloc_free_block(trans, new_root, buf->len,
+ new_root_objectid, &disk_key,
+ level, buf->start, 0);
if (IS_ERR(cow)) {
kfree(new_root);
return PTR_ERR(cow);
copy_extent_buffer(cow, buf, 0, 0, cow->len);
btrfs_set_header_bytenr(cow, cow->start);
btrfs_set_header_generation(cow, trans->transid);
- btrfs_set_header_owner(cow, new_root_objectid);
+ btrfs_set_header_backref_rev(cow, BTRFS_MIXED_BACKREF_REV);
+ btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN |
+ BTRFS_HEADER_FLAG_RELOC);
+ if (new_root_objectid == BTRFS_TREE_RELOC_OBJECTID)
+ btrfs_set_header_flag(cow, BTRFS_HEADER_FLAG_RELOC);
+ else
+ btrfs_set_header_owner(cow, new_root_objectid);
+
+ write_extent_buffer(cow, root->fs_info->fsid,
+ btrfs_header_fsid(), BTRFS_FSID_SIZE);
WARN_ON(btrfs_header_generation(buf) > trans->transid);
- ret = btrfs_inc_ref(trans, new_root, buf);
+ ret = btrfs_inc_ref(trans, new_root, cow, 0);
kfree(new_root);
if (ret)
return 0;
}
+/*
+ * check if the tree block can be shared by multiple trees
+ */
+static int btrfs_block_can_be_shared(struct btrfs_root *root,
+ struct extent_buffer *buf)
+{
+ /*
+ * Tree blocks not in reference counted trees and tree roots
+ * are never shared. If a block was allocated after the last
+ * snapshot and the block was not allocated by tree relocation,
+ * we know the block is not shared.
+ */
+ if (root->ref_cows &&
+ buf != root->node && buf != root->commit_root &&
+ (btrfs_header_generation(buf) <=
+ btrfs_root_last_snapshot(&root->root_item) ||
+ btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC)))
+ return 1;
+#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
+ if (root->ref_cows &&
+ btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV)
+ return 1;
+#endif
+ return 0;
+}
+
+static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *buf,
+ struct extent_buffer *cow)
+{
+ u64 refs;
+ u64 owner;
+ u64 flags;
+ u64 new_flags = 0;
+ int ret;
+
+ /*
+ * Backrefs update rules:
+ *
+ * Always use full backrefs for extent pointers in tree block
+ * allocated by tree relocation.
+ *
+ * If a shared tree block is no longer referenced by its owner
+ * tree (btrfs_header_owner(buf) == root->root_key.objectid),
+ * use full backrefs for extent pointers in tree block.
+ *
+ * If a tree block is been relocating
+ * (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID),
+ * use full backrefs for extent pointers in tree block.
+ * The reason for this is some operations (such as drop tree)
+ * are only allowed for blocks use full backrefs.
+ */
+
+ if (btrfs_block_can_be_shared(root, buf)) {
+ ret = btrfs_lookup_extent_info(trans, root, buf->start,
+ btrfs_header_level(buf), 1,
+ &refs, &flags);
+ BUG_ON(ret);
+ BUG_ON(refs == 0);
+ } else {
+ refs = 1;
+ if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID ||
+ btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV)
+ flags = BTRFS_BLOCK_FLAG_FULL_BACKREF;
+ else
+ flags = 0;
+ }
+
+ owner = btrfs_header_owner(buf);
+ BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) &&
+ owner == BTRFS_TREE_RELOC_OBJECTID);
+
+ if (refs > 1) {
+ if ((owner == root->root_key.objectid ||
+ root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) &&
+ !(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) {
+ ret = btrfs_inc_ref(trans, root, buf, 1);
+ BUG_ON(ret);
+
+ if (root->root_key.objectid ==
+ BTRFS_TREE_RELOC_OBJECTID) {
+ ret = btrfs_dec_ref(trans, root, buf, 0);
+ BUG_ON(ret);
+ ret = btrfs_inc_ref(trans, root, cow, 1);
+ BUG_ON(ret);
+ }
+ new_flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
+ } else {
+
+ if (root->root_key.objectid ==
+ BTRFS_TREE_RELOC_OBJECTID)
+ ret = btrfs_inc_ref(trans, root, cow, 1);
+ else
+ ret = btrfs_inc_ref(trans, root, cow, 0);
+ BUG_ON(ret);
+ }
+ if (new_flags != 0) {
+ ret = btrfs_set_block_flags(trans, root, buf->start,
+ btrfs_header_level(buf),
+ new_flags);
+ BUG_ON(ret);
+ }
+ } else {
+ if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
+ if (root->root_key.objectid ==
+ BTRFS_TREE_RELOC_OBJECTID)
+ ret = btrfs_inc_ref(trans, root, cow, 1);
+ else
+ ret = btrfs_inc_ref(trans, root, cow, 0);
+ BUG_ON(ret);
+ ret = btrfs_dec_ref(trans, root, buf, 1);
+ BUG_ON(ret);
+ }
+ clean_tree_block(trans, root, buf);
+ }
+ return 0;
+}
+
int __btrfs_cow_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *buf,
struct extent_buffer **cow_ret,
u64 search_start, u64 empty_size)
{
- u64 root_gen;
struct extent_buffer *cow;
- u32 nritems;
- int ret = 0;
- int different_trans = 0;
+ struct btrfs_disk_key disk_key;
int level;
- struct btrfs_key first_key;
-
- if (root->ref_cows) {
- root_gen = trans->transid;
- } else {
- root_gen = 0;
- }
WARN_ON(root->ref_cows && trans->transid !=
root->fs_info->running_transaction->transid);
WARN_ON(root->ref_cows && trans->transid != root->last_trans);
level = btrfs_header_level(buf);
- nritems = btrfs_header_nritems(buf);
- if (nritems) {
- if (level == 0)
- btrfs_item_key_to_cpu(buf, &first_key, 0);
- else
- btrfs_node_key_to_cpu(buf, &first_key, 0);
- } else {
- first_key.objectid = 0;
- }
- cow = __btrfs_alloc_free_block(trans, root, buf->len,
- root->root_key.objectid,
- root_gen, first_key.objectid, level,
- search_start, empty_size);
+
+ if (level == 0)
+ btrfs_item_key(buf, &disk_key, 0);
+ else
+ btrfs_node_key(buf, &disk_key, 0);
+
+ cow = btrfs_alloc_free_block(trans, root, buf->len,
+ root->root_key.objectid, &disk_key,
+ level, search_start, empty_size);
if (IS_ERR(cow))
return PTR_ERR(cow);
copy_extent_buffer(cow, buf, 0, 0, cow->len);
btrfs_set_header_bytenr(cow, cow->start);
btrfs_set_header_generation(cow, trans->transid);
- btrfs_set_header_owner(cow, root->root_key.objectid);
+ btrfs_set_header_backref_rev(cow, BTRFS_MIXED_BACKREF_REV);
+ btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN |
+ BTRFS_HEADER_FLAG_RELOC);
+ if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)
+ btrfs_set_header_flag(cow, BTRFS_HEADER_FLAG_RELOC);
+ else
+ btrfs_set_header_owner(cow, root->root_key.objectid);
- WARN_ON(btrfs_header_generation(buf) > trans->transid);
- if (btrfs_header_generation(buf) != trans->transid) {
- different_trans = 1;
- ret = btrfs_inc_ref(trans, root, buf);
- if (ret)
- return ret;
- } else {
- clean_tree_block(trans, root, buf);
- }
+ write_extent_buffer(cow, root->fs_info->fsid,
+ btrfs_header_fsid(), BTRFS_FSID_SIZE);
+
+ WARN_ON(!(buf->flags & EXTENT_BAD_TRANSID) &&
+ btrfs_header_generation(buf) > trans->transid);
+
+ update_ref_for_cow(trans, root, buf, cow);
if (buf == root->node) {
- root_gen = btrfs_header_generation(buf);
root->node = cow;
extent_buffer_get(cow);
- if (buf != root->commit_root) {
- btrfs_free_extent(trans, root, buf->start,
- buf->len, root->root_key.objectid,
- root_gen, 0, 0, 1);
- }
+
+ btrfs_free_extent(trans, root, buf->start, buf->len,
+ 0, root->root_key.objectid, level, 0);
free_extent_buffer(buf);
+ add_root_to_dirty_list(root);
} else {
- root_gen = btrfs_header_generation(parent);
btrfs_set_node_blockptr(parent, parent_slot,
cow->start);
WARN_ON(trans->transid == 0);
trans->transid);
btrfs_mark_buffer_dirty(parent);
WARN_ON(btrfs_header_generation(parent) != trans->transid);
+
btrfs_free_extent(trans, root, buf->start, buf->len,
- btrfs_header_owner(parent), root_gen,
- 0, 0, 1);
+ 0, root->root_key.objectid, level, 1);
+ }
+ if (!list_empty(&buf->recow)) {
+ list_del_init(&buf->recow);
+ free_extent_buffer(buf);
}
free_extent_buffer(buf);
btrfs_mark_buffer_dirty(cow);
return 0;
}
+static inline int should_cow_block(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct extent_buffer *buf)
+{
+ if (btrfs_header_generation(buf) == trans->transid &&
+ !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN) &&
+ !(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID &&
+ btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC)))
+ return 0;
+ return 1;
+}
+
int btrfs_cow_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *buf,
struct extent_buffer *parent, int parent_slot,
}
*/
if (trans->transid != root->fs_info->generation) {
- printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid,
- root->fs_info->generation);
+ printk(KERN_CRIT "trans %llu running %llu\n",
+ (unsigned long long)trans->transid,
+ (unsigned long long)root->fs_info->generation);
WARN_ON(1);
}
- if (btrfs_header_generation(buf) == trans->transid) {
+ if (!should_cow_block(trans, root, buf)) {
*cow_ret = buf;
return 0;
}
- search_start = buf->start & ~((u64)BTRFS_BLOCK_GROUP_SIZE - 1);
+ search_start = buf->start & ~((u64)SZ_1G - 1);
ret = __btrfs_cow_block(trans, root, buf, parent,
parent_slot, cow_ret, search_start, 0);
return ret;
}
-/*
-static int close_blocks(u64 blocknr, u64 other, u32 blocksize)
+int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2)
{
- if (blocknr < other && other - (blocknr + blocksize) < 32768)
+ if (k1->objectid > k2->objectid)
+ return 1;
+ if (k1->objectid < k2->objectid)
+ return -1;
+ if (k1->type > k2->type)
return 1;
- if (blocknr > other && blocknr - (other + blocksize) < 32768)
+ if (k1->type < k2->type)
+ return -1;
+ if (k1->offset > k2->offset)
return 1;
+ if (k1->offset < k2->offset)
+ return -1;
return 0;
}
-*/
/*
* compare two keys in a memcmp fashion
*/
-int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2)
+static int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2)
{
struct btrfs_key k1;
btrfs_disk_key_to_cpu(&k1, disk);
-
- if (k1.objectid > k2->objectid)
- return 1;
- if (k1.objectid < k2->objectid)
- return -1;
- if (k1.type > k2->type)
- return 1;
- if (k1.type < k2->type)
- return -1;
- if (k1.offset > k2->offset)
- return 1;
- if (k1.offset < k2->offset)
- return -1;
- return 0;
-}
-
-
-#if 0
-int btrfs_realloc_node(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct extent_buffer *parent,
- int start_slot, int cache_only, u64 *last_ret,
- struct btrfs_key *progress)
-{
- struct extent_buffer *cur;
- struct extent_buffer *tmp;
- u64 blocknr;
- u64 search_start = *last_ret;
- u64 last_block = 0;
- u64 other;
- u32 parent_nritems;
- int end_slot;
- int i;
- int err = 0;
- int parent_level;
- int uptodate;
- u32 blocksize;
- int progress_passed = 0;
- struct btrfs_disk_key disk_key;
-
- parent_level = btrfs_header_level(parent);
- if (cache_only && parent_level != 1)
- return 0;
-
- if (trans->transaction != root->fs_info->running_transaction) {
- printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid,
- root->fs_info->running_transaction->transid);
- WARN_ON(1);
- }
- if (trans->transid != root->fs_info->generation) {
- printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid,
- root->fs_info->generation);
- WARN_ON(1);
- }
-
- parent_nritems = btrfs_header_nritems(parent);
- blocksize = btrfs_level_size(root, parent_level - 1);
- end_slot = parent_nritems;
-
- if (parent_nritems == 1)
- return 0;
-
- for (i = start_slot; i < end_slot; i++) {
- int close = 1;
-
- if (!parent->map_token) {
- map_extent_buffer(parent,
- btrfs_node_key_ptr_offset(i),
- sizeof(struct btrfs_key_ptr),
- &parent->map_token, &parent->kaddr,
- &parent->map_start, &parent->map_len,
- KM_USER1);
- }
- btrfs_node_key(parent, &disk_key, i);
- if (!progress_passed && comp_keys(&disk_key, progress) < 0)
- continue;
-
- progress_passed = 1;
- blocknr = btrfs_node_blockptr(parent, i);
- if (last_block == 0)
- last_block = blocknr;
-
- if (i > 0) {
- other = btrfs_node_blockptr(parent, i - 1);
- close = close_blocks(blocknr, other, blocksize);
- }
- if (close && i < end_slot - 2) {
- other = btrfs_node_blockptr(parent, i + 1);
- close = close_blocks(blocknr, other, blocksize);
- }
- if (close) {
- last_block = blocknr;
- continue;
- }
- if (parent->map_token) {
- unmap_extent_buffer(parent, parent->map_token,
- KM_USER1);
- parent->map_token = NULL;
- }
-
- cur = btrfs_find_tree_block(root, blocknr, blocksize);
- if (cur)
- uptodate = btrfs_buffer_uptodate(cur);
- else
- uptodate = 0;
- if (!cur || !uptodate) {
- if (cache_only) {
- free_extent_buffer(cur);
- continue;
- }
- if (!cur) {
- cur = read_tree_block(root, blocknr,
- blocksize);
- } else if (!uptodate) {
- btrfs_read_buffer(cur);
- }
- }
- if (search_start == 0)
- search_start = last_block;
-
- err = __btrfs_cow_block(trans, root, cur, parent, i,
- &tmp, search_start,
- min(16 * blocksize,
- (end_slot - i) * blocksize));
- if (err) {
- free_extent_buffer(cur);
- break;
- }
- search_start = tmp->start;
- last_block = tmp->start;
- *last_ret = search_start;
- if (parent_level == 1)
- btrfs_clear_buffer_defrag(tmp);
- free_extent_buffer(tmp);
- }
- if (parent->map_token) {
- unmap_extent_buffer(parent, parent->map_token,
- KM_USER1);
- parent->map_token = NULL;
- }
- return err;
+ return btrfs_comp_cpu_keys(&k1, k2);
}
-#endif
/*
* The leaf data grows from end-to-front in the node.
* this returns the address of the start of the last item,
* which is the stop of the leaf data stack
*/
-static inline unsigned int leaf_data_end(struct btrfs_root *root,
- struct extent_buffer *leaf)
+static inline unsigned int leaf_data_end(const struct btrfs_fs_info *fs_info,
+ const struct extent_buffer *leaf)
{
u32 nr = btrfs_header_nritems(leaf);
if (nr == 0)
- return BTRFS_LEAF_DATA_SIZE(root);
+ return BTRFS_LEAF_DATA_SIZE(fs_info);
return btrfs_item_offset_nr(leaf, nr - 1);
}
-static int check_node(struct btrfs_root *root, struct btrfs_path *path,
- int level)
+enum btrfs_tree_block_status
+btrfs_check_node(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
+ struct extent_buffer *buf)
{
- struct extent_buffer *parent = NULL;
- struct extent_buffer *node = path->nodes[level];
- struct btrfs_disk_key parent_key;
- struct btrfs_disk_key node_key;
- int parent_slot;
- int slot;
+ int i;
struct btrfs_key cpukey;
- u32 nritems = btrfs_header_nritems(node);
+ struct btrfs_disk_key key;
+ u32 nritems = btrfs_header_nritems(buf);
+ enum btrfs_tree_block_status ret = BTRFS_TREE_BLOCK_INVALID_NRITEMS;
- if (path->nodes[level + 1])
- parent = path->nodes[level + 1];
+ if (nritems == 0 || nritems > BTRFS_NODEPTRS_PER_BLOCK(root->fs_info))
+ goto fail;
- slot = path->slots[level];
- BUG_ON(nritems == 0);
- if (parent) {
- parent_slot = path->slots[level + 1];
- btrfs_node_key(parent, &parent_key, parent_slot);
- btrfs_node_key(node, &node_key, 0);
- BUG_ON(memcmp(&parent_key, &node_key,
- sizeof(struct btrfs_disk_key)));
- BUG_ON(btrfs_node_blockptr(parent, parent_slot) !=
- btrfs_header_bytenr(node));
- }
- BUG_ON(nritems > BTRFS_NODEPTRS_PER_BLOCK(root));
- if (slot != 0) {
- btrfs_node_key_to_cpu(node, &cpukey, slot - 1);
- btrfs_node_key(node, &node_key, slot);
- BUG_ON(btrfs_comp_keys(&node_key, &cpukey) <= 0);
+ ret = BTRFS_TREE_BLOCK_INVALID_PARENT_KEY;
+ if (parent_key && parent_key->type) {
+ btrfs_node_key(buf, &key, 0);
+ if (memcmp(parent_key, &key, sizeof(key)))
+ goto fail;
}
- if (slot < nritems - 1) {
- btrfs_node_key_to_cpu(node, &cpukey, slot + 1);
- btrfs_node_key(node, &node_key, slot);
- BUG_ON(btrfs_comp_keys(&node_key, &cpukey) >= 0);
+ ret = BTRFS_TREE_BLOCK_BAD_KEY_ORDER;
+ for (i = 0; nritems > 1 && i < nritems - 2; i++) {
+ btrfs_node_key(buf, &key, i);
+ btrfs_node_key_to_cpu(buf, &cpukey, i + 1);
+ if (btrfs_comp_keys(&key, &cpukey) >= 0)
+ goto fail;
+ }
+ return BTRFS_TREE_BLOCK_CLEAN;
+fail:
+ if (btrfs_header_owner(buf) == BTRFS_EXTENT_TREE_OBJECTID) {
+ if (parent_key)
+ btrfs_disk_key_to_cpu(&cpukey, parent_key);
+ else
+ btrfs_node_key_to_cpu(buf, &cpukey, 0);
+ btrfs_add_corrupt_extent_record(root->fs_info, &cpukey,
+ buf->start, buf->len,
+ btrfs_header_level(buf));
}
- return 0;
+ return ret;
}
-static int check_leaf(struct btrfs_root *root, struct btrfs_path *path,
- int level)
+enum btrfs_tree_block_status
+btrfs_check_leaf(struct btrfs_root *root, struct btrfs_disk_key *parent_key,
+ struct extent_buffer *buf)
{
- struct extent_buffer *leaf = path->nodes[level];
- struct extent_buffer *parent = NULL;
- int parent_slot;
+ int i;
struct btrfs_key cpukey;
- struct btrfs_disk_key parent_key;
- struct btrfs_disk_key leaf_key;
- int slot = path->slots[0];
+ struct btrfs_disk_key key;
+ u32 nritems = btrfs_header_nritems(buf);
+ enum btrfs_tree_block_status ret = BTRFS_TREE_BLOCK_INVALID_NRITEMS;
- u32 nritems = btrfs_header_nritems(leaf);
+ if (nritems * sizeof(struct btrfs_item) > buf->len) {
+ fprintf(stderr, "invalid number of items %llu\n",
+ (unsigned long long)buf->start);
+ goto fail;
+ }
- if (path->nodes[level + 1])
- parent = path->nodes[level + 1];
+ if (btrfs_header_level(buf) != 0) {
+ ret = BTRFS_TREE_BLOCK_INVALID_LEVEL;
+ fprintf(stderr, "leaf is not a leaf %llu\n",
+ (unsigned long long)btrfs_header_bytenr(buf));
+ goto fail;
+ }
+ if (btrfs_leaf_free_space(root, buf) < 0) {
+ ret = BTRFS_TREE_BLOCK_INVALID_FREE_SPACE;
+ fprintf(stderr, "leaf free space incorrect %llu %d\n",
+ (unsigned long long)btrfs_header_bytenr(buf),
+ btrfs_leaf_free_space(root, buf));
+ goto fail;
+ }
if (nritems == 0)
- return 0;
-
- if (parent) {
- parent_slot = path->slots[level + 1];
- btrfs_node_key(parent, &parent_key, parent_slot);
- btrfs_item_key(leaf, &leaf_key, 0);
-
- BUG_ON(memcmp(&parent_key, &leaf_key,
- sizeof(struct btrfs_disk_key)));
- BUG_ON(btrfs_node_blockptr(parent, parent_slot) !=
- btrfs_header_bytenr(leaf));
- }
-#if 0
- for (i = 0; nritems > 1 && i < nritems - 2; i++) {
- btrfs_item_key_to_cpu(leaf, &cpukey, i + 1);
- btrfs_item_key(leaf, &leaf_key, i);
- if (comp_keys(&leaf_key, &cpukey) >= 0) {
- btrfs_print_leaf(root, leaf);
- printk("slot %d offset bad key\n", i);
- BUG_ON(1);
- }
- if (btrfs_item_offset_nr(leaf, i) !=
- btrfs_item_end_nr(leaf, i + 1)) {
- btrfs_print_leaf(root, leaf);
- printk("slot %d offset bad\n", i);
- BUG_ON(1);
+ return BTRFS_TREE_BLOCK_CLEAN;
+
+ btrfs_item_key(buf, &key, 0);
+ if (parent_key && parent_key->type &&
+ memcmp(parent_key, &key, sizeof(key))) {
+ ret = BTRFS_TREE_BLOCK_INVALID_PARENT_KEY;
+ fprintf(stderr, "leaf parent key incorrect %llu\n",
+ (unsigned long long)btrfs_header_bytenr(buf));
+ goto fail;
+ }
+ for (i = 0; nritems > 1 && i < nritems - 1; i++) {
+ btrfs_item_key(buf, &key, i);
+ btrfs_item_key_to_cpu(buf, &cpukey, i + 1);
+ if (btrfs_comp_keys(&key, &cpukey) >= 0) {
+ ret = BTRFS_TREE_BLOCK_BAD_KEY_ORDER;
+ fprintf(stderr, "bad key ordering %d %d\n", i, i+1);
+ goto fail;
}
- if (i == 0) {
- if (btrfs_item_offset_nr(leaf, i) +
- btrfs_item_size_nr(leaf, i) !=
- BTRFS_LEAF_DATA_SIZE(root)) {
- btrfs_print_leaf(root, leaf);
- printk("slot %d first offset bad\n", i);
- BUG_ON(1);
- }
+ if (btrfs_item_offset_nr(buf, i) !=
+ btrfs_item_end_nr(buf, i + 1)) {
+ ret = BTRFS_TREE_BLOCK_INVALID_OFFSETS;
+ fprintf(stderr, "incorrect offsets %u %u\n",
+ btrfs_item_offset_nr(buf, i),
+ btrfs_item_end_nr(buf, i + 1));
+ goto fail;
}
- }
- if (nritems > 0) {
- if (btrfs_item_size_nr(leaf, nritems - 1) > 4096) {
- btrfs_print_leaf(root, leaf);
- printk("slot %d bad size \n", nritems - 1);
- BUG_ON(1);
+ if (i == 0 && btrfs_item_end_nr(buf, i) !=
+ BTRFS_LEAF_DATA_SIZE(root->fs_info)) {
+ ret = BTRFS_TREE_BLOCK_INVALID_OFFSETS;
+ fprintf(stderr, "bad item end %u wanted %u\n",
+ btrfs_item_end_nr(buf, i),
+ (unsigned)BTRFS_LEAF_DATA_SIZE(root->fs_info));
+ goto fail;
}
}
-#endif
- if (slot != 0 && slot < nritems - 1) {
- btrfs_item_key(leaf, &leaf_key, slot);
- btrfs_item_key_to_cpu(leaf, &cpukey, slot - 1);
- if (btrfs_comp_keys(&leaf_key, &cpukey) <= 0) {
- btrfs_print_leaf(root, leaf);
- printk("slot %d offset bad key\n", slot);
- BUG_ON(1);
- }
- if (btrfs_item_offset_nr(leaf, slot - 1) !=
- btrfs_item_end_nr(leaf, slot)) {
- btrfs_print_leaf(root, leaf);
- printk("slot %d offset bad\n", slot);
- BUG_ON(1);
+
+ for (i = 0; i < nritems; i++) {
+ if (btrfs_item_end_nr(buf, i) >
+ BTRFS_LEAF_DATA_SIZE(root->fs_info)) {
+ btrfs_item_key(buf, &key, 0);
+ btrfs_print_key(&key);
+ fflush(stdout);
+ ret = BTRFS_TREE_BLOCK_INVALID_OFFSETS;
+ fprintf(stderr, "slot end outside of leaf %llu > %llu\n",
+ (unsigned long long)btrfs_item_end_nr(buf, i),
+ (unsigned long long)BTRFS_LEAF_DATA_SIZE(
+ root->fs_info));
+ goto fail;
}
}
- if (slot < nritems - 1) {
- btrfs_item_key(leaf, &leaf_key, slot);
- btrfs_item_key_to_cpu(leaf, &cpukey, slot + 1);
- BUG_ON(btrfs_comp_keys(&leaf_key, &cpukey) >= 0);
- if (btrfs_item_offset_nr(leaf, slot) !=
- btrfs_item_end_nr(leaf, slot + 1)) {
- btrfs_print_leaf(root, leaf);
- printk("slot %d offset bad\n", slot);
- BUG_ON(1);
- }
+
+ return BTRFS_TREE_BLOCK_CLEAN;
+fail:
+ if (btrfs_header_owner(buf) == BTRFS_EXTENT_TREE_OBJECTID) {
+ if (parent_key)
+ btrfs_disk_key_to_cpu(&cpukey, parent_key);
+ else
+ btrfs_item_key_to_cpu(buf, &cpukey, 0);
+
+ btrfs_add_corrupt_extent_record(root->fs_info, &cpukey,
+ buf->start, buf->len, 0);
}
- BUG_ON(btrfs_item_offset_nr(leaf, 0) +
- btrfs_item_size_nr(leaf, 0) != BTRFS_LEAF_DATA_SIZE(root));
- return 0;
+ return ret;
}
static int noinline check_block(struct btrfs_root *root,
struct btrfs_path *path, int level)
{
- return 0;
-#if 0
- struct extent_buffer *buf = path->nodes[level];
+ struct btrfs_disk_key key;
+ struct btrfs_disk_key *key_ptr = NULL;
+ struct extent_buffer *parent;
+ enum btrfs_tree_block_status ret;
- if (memcmp_extent_buffer(buf, root->fs_info->fsid,
- (unsigned long)btrfs_header_fsid(buf),
- BTRFS_FSID_SIZE)) {
- printk("warning bad block %Lu\n", buf->start);
- return 1;
+ if (path->skip_check_block)
+ return 0;
+ if (path->nodes[level + 1]) {
+ parent = path->nodes[level + 1];
+ btrfs_node_key(parent, &key, path->slots[level + 1]);
+ key_ptr = &key;
}
-#endif
if (level == 0)
- return check_leaf(root, path, level);
- return check_node(root, path, level);
+ ret = btrfs_check_leaf(root, key_ptr, path->nodes[0]);
+ else
+ ret = btrfs_check_node(root, key_ptr, path->nodes[level]);
+ if (ret == BTRFS_TREE_BLOCK_CLEAN)
+ return 0;
+ return -EIO;
}
/*
static int bin_search(struct extent_buffer *eb, struct btrfs_key *key,
int level, int *slot)
{
- if (level == 0) {
+ if (level == 0)
return generic_bin_search(eb,
offsetof(struct btrfs_leaf, items),
sizeof(struct btrfs_item),
key, btrfs_header_nritems(eb),
slot);
- } else {
+ else
return generic_bin_search(eb,
offsetof(struct btrfs_node, ptrs),
sizeof(struct btrfs_key_ptr),
key, btrfs_header_nritems(eb),
slot);
- }
- return -1;
}
-static struct extent_buffer *read_node_slot(struct btrfs_root *root,
+struct extent_buffer *read_node_slot(struct btrfs_fs_info *fs_info,
struct extent_buffer *parent, int slot)
{
+ struct extent_buffer *ret;
+ int level = btrfs_header_level(parent);
+
if (slot < 0)
return NULL;
if (slot >= btrfs_header_nritems(parent))
return NULL;
- return read_tree_block(root, btrfs_node_blockptr(parent, slot),
- btrfs_level_size(root, btrfs_header_level(parent) - 1));
+
+ if (level == 0)
+ return NULL;
+
+ ret = read_tree_block(fs_info, btrfs_node_blockptr(parent, slot),
+ btrfs_node_ptr_generation(parent, slot));
+ if (!extent_buffer_uptodate(ret))
+ return ERR_PTR(-EIO);
+
+ if (btrfs_header_level(ret) != level - 1) {
+ error(
+"child eb corrupted: parent bytenr=%llu item=%d parent level=%d child level=%d",
+ btrfs_header_bytenr(parent), slot,
+ btrfs_header_level(parent), btrfs_header_level(ret));
+ free_extent_buffer(ret);
+ return ERR_PTR(-EIO);
+ }
+ return ret;
}
static int balance_level(struct btrfs_trans_handle *trans,
struct extent_buffer *mid;
struct extent_buffer *left = NULL;
struct extent_buffer *parent = NULL;
+ struct btrfs_fs_info *fs_info = root->fs_info;
int ret = 0;
int wret;
int pslot;
int orig_slot = path->slots[level];
- int err_on_enospc = 0;
u64 orig_ptr;
if (level == 0)
orig_ptr = btrfs_node_blockptr(mid, orig_slot);
- if (level < BTRFS_MAX_LEVEL - 1)
+ if (level < BTRFS_MAX_LEVEL - 1) {
parent = path->nodes[level + 1];
- pslot = path->slots[level + 1];
+ pslot = path->slots[level + 1];
+ }
/*
* deal with the case where there is only one pointer in the root
return 0;
/* promote the child to a root */
- child = read_node_slot(root, mid, 0);
- BUG_ON(!child);
+ child = read_node_slot(fs_info, mid, 0);
+ BUG_ON(!extent_buffer_uptodate(child));
+ ret = btrfs_cow_block(trans, root, child, mid, 0, &child);
+ BUG_ON(ret);
+
root->node = child;
+ add_root_to_dirty_list(root);
path->nodes[level] = NULL;
clean_tree_block(trans, root, mid);
- wait_on_tree_block_writeback(root, mid);
/* once for the path */
free_extent_buffer(mid);
+
ret = btrfs_free_extent(trans, root, mid->start, mid->len,
- root->root_key.objectid,
- btrfs_header_generation(mid), 0, 0, 1);
+ 0, root->root_key.objectid,
+ level, 1);
/* once for the root ptr */
free_extent_buffer(mid);
return ret;
}
if (btrfs_header_nritems(mid) >
- BTRFS_NODEPTRS_PER_BLOCK(root) / 4)
+ BTRFS_NODEPTRS_PER_BLOCK(fs_info) / 4)
return 0;
- if (btrfs_header_nritems(mid) < 2)
- err_on_enospc = 1;
-
- left = read_node_slot(root, parent, pslot - 1);
- if (left) {
+ left = read_node_slot(fs_info, parent, pslot - 1);
+ if (extent_buffer_uptodate(left)) {
wret = btrfs_cow_block(trans, root, left,
parent, pslot - 1, &left);
if (wret) {
goto enospc;
}
}
- right = read_node_slot(root, parent, pslot + 1);
- if (right) {
+ right = read_node_slot(fs_info, parent, pslot + 1);
+ if (extent_buffer_uptodate(right)) {
wret = btrfs_cow_block(trans, root, right,
parent, pslot + 1, &right);
if (wret) {
/* first, try to make some room in the middle buffer */
if (left) {
orig_slot += btrfs_header_nritems(left);
- wret = push_node_left(trans, root, left, mid);
+ wret = push_node_left(trans, root, left, mid, 1);
if (wret < 0)
ret = wret;
- if (btrfs_header_nritems(mid) < 2)
- err_on_enospc = 1;
}
/*
* then try to empty the right most buffer into the middle
*/
if (right) {
- wret = push_node_left(trans, root, mid, right);
+ wret = push_node_left(trans, root, mid, right, 1);
if (wret < 0 && wret != -ENOSPC)
ret = wret;
if (btrfs_header_nritems(right) == 0) {
u64 bytenr = right->start;
- u64 generation = btrfs_header_generation(parent);
u32 blocksize = right->len;
clean_tree_block(trans, root, right);
- wait_on_tree_block_writeback(root, right);
free_extent_buffer(right);
right = NULL;
- wret = del_ptr(trans, root, path, level + 1, pslot +
- 1);
+ wret = btrfs_del_ptr(root, path, level + 1, pslot + 1);
if (wret)
ret = wret;
wret = btrfs_free_extent(trans, root, bytenr,
- blocksize,
- btrfs_header_owner(parent),
- generation, 0, 0, 1);
+ blocksize, 0,
+ root->root_key.objectid,
+ level, 0);
if (wret)
ret = wret;
} else {
ret = wret;
goto enospc;
}
+ if (wret == 1) {
+ wret = push_node_left(trans, root, left, mid, 1);
+ if (wret < 0)
+ ret = wret;
+ }
BUG_ON(wret == 1);
}
if (btrfs_header_nritems(mid) == 0) {
/* we've managed to empty the middle node, drop it */
- u64 root_gen = btrfs_header_generation(parent);
u64 bytenr = mid->start;
u32 blocksize = mid->len;
clean_tree_block(trans, root, mid);
- wait_on_tree_block_writeback(root, mid);
free_extent_buffer(mid);
mid = NULL;
- wret = del_ptr(trans, root, path, level + 1, pslot);
+ wret = btrfs_del_ptr(root, path, level + 1, pslot);
if (wret)
ret = wret;
wret = btrfs_free_extent(trans, root, bytenr, blocksize,
- btrfs_header_owner(parent),
- root_gen, 0, 0, 1);
+ 0, root->root_key.objectid,
+ level, 0);
if (wret)
ret = wret;
} else {
struct extent_buffer *mid;
struct extent_buffer *left = NULL;
struct extent_buffer *parent = NULL;
+ struct btrfs_fs_info *fs_info = root->fs_info;
int ret = 0;
int wret;
int pslot;
int orig_slot = path->slots[level];
- u64 orig_ptr;
if (level == 0)
return 1;
mid = path->nodes[level];
WARN_ON(btrfs_header_generation(mid) != trans->transid);
- orig_ptr = btrfs_node_blockptr(mid, orig_slot);
- if (level < BTRFS_MAX_LEVEL - 1)
+ if (level < BTRFS_MAX_LEVEL - 1) {
parent = path->nodes[level + 1];
- pslot = path->slots[level + 1];
+ pslot = path->slots[level + 1];
+ }
if (!parent)
return 1;
- left = read_node_slot(root, parent, pslot - 1);
+ left = read_node_slot(fs_info, parent, pslot - 1);
/* first, try to make some room in the middle buffer */
- if (left) {
+ if (extent_buffer_uptodate(left)) {
u32 left_nr;
left_nr = btrfs_header_nritems(left);
- if (left_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) {
+ if (left_nr >= BTRFS_NODEPTRS_PER_BLOCK(fs_info) - 1) {
wret = 1;
} else {
ret = btrfs_cow_block(trans, root, left, parent,
wret = 1;
else {
wret = push_node_left(trans, root,
- left, mid);
+ left, mid, 0);
}
}
if (wret < 0)
}
free_extent_buffer(left);
}
- right= read_node_slot(root, parent, pslot + 1);
+ right= read_node_slot(fs_info, parent, pslot + 1);
/*
* then try to empty the right most buffer into the middle
*/
- if (right) {
+ if (extent_buffer_uptodate(right)) {
u32 right_nr;
right_nr = btrfs_header_nritems(right);
- if (right_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) {
+ if (right_nr >= BTRFS_NODEPTRS_PER_BLOCK(root->fs_info) - 1) {
wret = 1;
} else {
ret = btrfs_cow_block(trans, root, right,
/*
* readahead one full node of leaves
*/
-static void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
+void reada_for_search(struct btrfs_root *root, struct btrfs_path *path,
int level, int slot, u64 objectid)
{
+ struct btrfs_fs_info *fs_info = root->fs_info;
struct extent_buffer *node;
struct btrfs_disk_key disk_key;
u32 nritems;
int direction = path->reada;
struct extent_buffer *eb;
u32 nr;
- u32 blocksize;
u32 nscan = 0;
if (level != 1)
node = path->nodes[level];
search = btrfs_node_blockptr(node, slot);
- blocksize = btrfs_level_size(root, level - 1);
- eb = btrfs_find_tree_block(root, search, blocksize);
+ eb = btrfs_find_tree_block(fs_info, search, fs_info->nodesize);
if (eb) {
free_extent_buffer(eb);
return;
if ((search >= lowest_read && search <= highest_read) ||
(search < lowest_read && lowest_read - search <= 32768) ||
(search > highest_read && search - highest_read <= 32768)) {
- readahead_tree_block(root, search, blocksize);
- nread += blocksize;
+ readahead_tree_block(fs_info, search,
+ btrfs_node_ptr_generation(node, nr));
+ nread += fs_info->nodesize;
}
nscan++;
- if (path->reada < 2 && (nread > (256 * 1024) || nscan > 32))
+ if (path->reada < 2 && (nread > SZ_256K || nscan > 32))
break;
- if(nread > (1024 * 1024) || nscan > 128)
+ if(nread > SZ_1M || nscan > 128)
break;
if (search < lowest_read)
}
}
+int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
+ u64 iobjectid, u64 ioff, u8 key_type,
+ struct btrfs_key *found_key)
+{
+ int ret;
+ struct btrfs_key key;
+ struct extent_buffer *eb;
+ struct btrfs_path *path;
+
+ key.type = key_type;
+ key.objectid = iobjectid;
+ key.offset = ioff;
+
+ if (found_path == NULL) {
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ } else
+ path = found_path;
+
+ ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0);
+ if ((ret < 0) || (found_key == NULL))
+ goto out;
+
+ eb = path->nodes[0];
+ if (ret && path->slots[0] >= btrfs_header_nritems(eb)) {
+ ret = btrfs_next_leaf(fs_root, path);
+ if (ret)
+ goto out;
+ eb = path->nodes[0];
+ }
+
+ btrfs_item_key_to_cpu(eb, found_key, path->slots[0]);
+ if (found_key->type != key.type ||
+ found_key->objectid != key.objectid) {
+ ret = 1;
+ goto out;
+ }
+
+out:
+ if (path != found_path)
+ btrfs_free_path(path);
+ return ret;
+}
+
/*
* look for key in the tree. path is filled in with nodes along the way
* if key is found, we return zero and you can find the item in the leaf
ins_len, int cow)
{
struct extent_buffer *b;
- u64 bytenr;
- u64 ptr_gen;
int slot;
int ret;
int level;
int should_reada = p->reada;
+ struct btrfs_fs_info *fs_info = root->fs_info;
u8 lowest_level = 0;
lowest_level = p->lowest_level;
- WARN_ON(lowest_level && ins_len);
+ WARN_ON(lowest_level && ins_len > 0);
WARN_ON(p->nodes[0] != NULL);
/*
WARN_ON(!mutex_is_locked(&root->fs_info->fs_mutex));
if (ret && slot > 0)
slot -= 1;
p->slots[level] = slot;
- if (ins_len > 0 && btrfs_header_nritems(b) >=
- BTRFS_NODEPTRS_PER_BLOCK(root) - 1) {
+ if ((p->search_for_split || ins_len > 0) &&
+ btrfs_header_nritems(b) >=
+ BTRFS_NODEPTRS_PER_BLOCK(fs_info) - 3) {
int sret = split_node(trans, root, p, level);
BUG_ON(sret > 0);
if (sret)
return sret;
b = p->nodes[level];
if (!b) {
- btrfs_release_path(NULL, p);
+ btrfs_release_path(p);
goto again;
}
slot = p->slots[level];
/* this is only true while dropping a snapshot */
if (level == lowest_level)
break;
- bytenr = btrfs_node_blockptr(b, slot);
- ptr_gen = btrfs_node_ptr_generation(b, slot);
+
if (should_reada)
reada_for_search(root, p, level, slot,
key->objectid);
- b = read_tree_block(root, bytenr,
- btrfs_level_size(root, level - 1));
- if (ptr_gen != btrfs_header_generation(b)) {
- printk("block %llu bad gen wanted %llu "
- "found %llu\n",
- (unsigned long long)b->start,
- (unsigned long long)ptr_gen,
- (unsigned long long)btrfs_header_generation(b));
- }
+
+ b = read_node_slot(fs_info, b, slot);
+ if (!extent_buffer_uptodate(b))
+ return -EIO;
} else {
p->slots[level] = slot;
- if (ins_len > 0 && btrfs_leaf_free_space(root, b) <
- sizeof(struct btrfs_item) + ins_len) {
+ if (ins_len > 0 &&
+ ins_len > btrfs_leaf_free_space(root, b)) {
int sret = split_leaf(trans, root, key,
p, ins_len, ret == 0);
BUG_ON(sret > 0);
* This is used after shifting pointers to the left, so it stops
* fixing up pointers when a given leaf/node is not in slot 0 of the
* higher levels
- *
- * If this fails to write a tree block, it returns -1, but continues
- * fixing up the blocks in ram so the tree is consistent.
*/
-static int fixup_low_keys(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct btrfs_path *path,
+void btrfs_fixup_low_keys(struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_disk_key *key, int level)
{
int i;
- int ret = 0;
struct extent_buffer *t;
for (i = level; i < BTRFS_MAX_LEVEL; i++) {
if (tslot != 0)
break;
}
- return ret;
}
/*
- * try to push data from one node into the next node left in the
- * tree.
+ * update item key.
*
- * returns 0 if some ptrs were pushed left, < 0 if there was some horrible
- * error, and > 0 if there was no room in the left hand block.
+ * This function isn't completely safe. It's the caller's responsibility
+ * that the new key won't break the order
*/
-static int push_node_left(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct extent_buffer *dst,
- struct extent_buffer *src)
+int btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path,
+ struct btrfs_key *new_key)
{
- int push_items = 0;
- int src_nritems;
- int dst_nritems;
- int ret = 0;
+ struct btrfs_disk_key disk_key;
+ struct extent_buffer *eb;
+ int slot;
- src_nritems = btrfs_header_nritems(src);
- dst_nritems = btrfs_header_nritems(dst);
- push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems;
- WARN_ON(btrfs_header_generation(src) != trans->transid);
+ eb = path->nodes[0];
+ slot = path->slots[0];
+ if (slot > 0) {
+ btrfs_item_key(eb, &disk_key, slot - 1);
+ if (btrfs_comp_keys(&disk_key, new_key) >= 0)
+ return -1;
+ }
+ if (slot < btrfs_header_nritems(eb) - 1) {
+ btrfs_item_key(eb, &disk_key, slot + 1);
+ if (btrfs_comp_keys(&disk_key, new_key) <= 0)
+ return -1;
+ }
+
+ btrfs_cpu_key_to_disk(&disk_key, new_key);
+ btrfs_set_item_key(eb, &disk_key, slot);
+ btrfs_mark_buffer_dirty(eb);
+ if (slot == 0)
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
+ return 0;
+}
+
+/*
+ * update an item key without the safety checks. This is meant to be called by
+ * fsck only.
+ */
+void btrfs_set_item_key_unsafe(struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *new_key)
+{
+ struct btrfs_disk_key disk_key;
+ struct extent_buffer *eb;
+ int slot;
+
+ eb = path->nodes[0];
+ slot = path->slots[0];
+
+ btrfs_cpu_key_to_disk(&disk_key, new_key);
+ btrfs_set_item_key(eb, &disk_key, slot);
+ btrfs_mark_buffer_dirty(eb);
+ if (slot == 0)
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
+}
+
+/*
+ * try to push data from one node into the next node left in the
+ * tree.
+ *
+ * returns 0 if some ptrs were pushed left, < 0 if there was some horrible
+ * error, and > 0 if there was no room in the left hand block.
+ */
+static int push_node_left(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct extent_buffer *dst,
+ struct extent_buffer *src, int empty)
+{
+ int push_items = 0;
+ int src_nritems;
+ int dst_nritems;
+ int ret = 0;
+
+ src_nritems = btrfs_header_nritems(src);
+ dst_nritems = btrfs_header_nritems(dst);
+ push_items = BTRFS_NODEPTRS_PER_BLOCK(root->fs_info) - dst_nritems;
+ WARN_ON(btrfs_header_generation(src) != trans->transid);
WARN_ON(btrfs_header_generation(dst) != trans->transid);
+ if (!empty && src_nritems <= 8)
+ return 1;
+
if (push_items <= 0) {
return 1;
}
- if (src_nritems < push_items)
- push_items = src_nritems;
+ if (empty) {
+ push_items = min(src_nritems, push_items);
+ if (push_items < src_nritems) {
+ /* leave at least 8 pointers in the node if
+ * we aren't going to empty it
+ */
+ if (src_nritems - push_items < 8) {
+ if (push_items <= 8)
+ return 1;
+ push_items -= 8;
+ }
+ }
+ } else
+ push_items = min(src_nritems - 8, push_items);
copy_extent_buffer(dst, src,
btrfs_node_key_ptr_offset(dst_nritems),
btrfs_set_header_nritems(dst, dst_nritems + push_items);
btrfs_mark_buffer_dirty(src);
btrfs_mark_buffer_dirty(dst);
+
return ret;
}
src_nritems = btrfs_header_nritems(src);
dst_nritems = btrfs_header_nritems(dst);
- push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems;
- if (push_items <= 0)
+ push_items = BTRFS_NODEPTRS_PER_BLOCK(root->fs_info) - dst_nritems;
+ if (push_items <= 0) {
+ return 1;
+ }
+
+ if (src_nritems < 4) {
return 1;
+ }
max_push = src_nritems / 2 + 1;
/* don't try to empty the node */
- if (max_push >= src_nritems)
+ if (max_push >= src_nritems) {
return 1;
+ }
if (max_push < push_items)
push_items = max_push;
btrfs_mark_buffer_dirty(src);
btrfs_mark_buffer_dirty(dst);
+
return ret;
}
struct btrfs_root *root,
struct btrfs_path *path, int level)
{
- u64 root_gen;
u64 lower_gen;
struct extent_buffer *lower;
struct extent_buffer *c;
+ struct extent_buffer *old;
struct btrfs_disk_key lower_key;
BUG_ON(path->nodes[level]);
BUG_ON(path->nodes[level-1] != root->node);
- if (root->ref_cows)
- root_gen = trans->transid;
- else
- root_gen = 0;
-
lower = path->nodes[level-1];
if (level == 1)
btrfs_item_key(lower, &lower_key, 0);
else
btrfs_node_key(lower, &lower_key, 0);
- c = __btrfs_alloc_free_block(trans, root, root->nodesize,
- root->root_key.objectid,
- root_gen, lower_key.objectid, level,
- root->node->start, 0);
+ c = btrfs_alloc_free_block(trans, root, root->fs_info->nodesize,
+ root->root_key.objectid, &lower_key,
+ level, root->node->start, 0);
+
if (IS_ERR(c))
return PTR_ERR(c);
- memset_extent_buffer(c, 0, 0, root->nodesize);
+
+ memset_extent_buffer(c, 0, 0, sizeof(struct btrfs_header));
btrfs_set_header_nritems(c, 1);
btrfs_set_header_level(c, level);
btrfs_set_header_bytenr(c, c->start);
btrfs_set_header_generation(c, trans->transid);
+ btrfs_set_header_backref_rev(c, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(c, root->root_key.objectid);
write_extent_buffer(c, root->fs_info->fsid,
- (unsigned long)btrfs_header_fsid(c),
- BTRFS_FSID_SIZE);
+ btrfs_header_fsid(), BTRFS_FSID_SIZE);
+
+ write_extent_buffer(c, root->fs_info->chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(c),
+ BTRFS_UUID_SIZE);
+
btrfs_set_node_key(c, &lower_key, 0);
btrfs_set_node_blockptr(c, 0, lower->start);
lower_gen = btrfs_header_generation(lower);
- WARN_ON(lower_gen == 0);
+ WARN_ON(lower_gen != trans->transid);
btrfs_set_node_ptr_generation(c, 0, lower_gen);
btrfs_mark_buffer_dirty(c);
- /* the super has an extra ref to root->node */
- free_extent_buffer(root->node);
+ old = root->node;
root->node = c;
+
+ /* the super has an extra ref to root->node */
+ free_extent_buffer(old);
+
+ add_root_to_dirty_list(root);
extent_buffer_get(c);
path->nodes[level] = c;
path->slots[level] = 0;
-
- if (root->ref_cows && lower_gen != trans->transid) {
- struct btrfs_path *back_path = btrfs_alloc_path();
- int ret;
- ret = btrfs_insert_extent_backref(trans,
- root->fs_info->extent_root,
- path, lower->start,
- root->root_key.objectid,
- trans->transid, 0, 0);
- BUG_ON(ret);
- btrfs_free_path(back_path);
- }
return 0;
}
nritems = btrfs_header_nritems(lower);
if (slot > nritems)
BUG();
- if (nritems == BTRFS_NODEPTRS_PER_BLOCK(root))
+ if (nritems == BTRFS_NODEPTRS_PER_BLOCK(root->fs_info))
BUG();
- if (slot != nritems) {
+ if (slot < nritems) {
+ /* shift the items */
memmove_extent_buffer(lower,
btrfs_node_key_ptr_offset(slot + 1),
btrfs_node_key_ptr_offset(slot),
static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, int level)
{
- u64 root_gen;
struct extent_buffer *c;
struct extent_buffer *split;
struct btrfs_disk_key disk_key;
ret = push_nodes_for_insert(trans, root, path, level);
c = path->nodes[level];
if (!ret && btrfs_header_nritems(c) <
- BTRFS_NODEPTRS_PER_BLOCK(root) - 1)
+ BTRFS_NODEPTRS_PER_BLOCK(root->fs_info) - 3)
return 0;
if (ret < 0)
return ret;
}
c_nritems = btrfs_header_nritems(c);
- if (root->ref_cows)
- root_gen = trans->transid;
- else
- root_gen = 0;
-
- btrfs_node_key(c, &disk_key, 0);
- split = __btrfs_alloc_free_block(trans, root, root->nodesize,
- root->root_key.objectid,
- root_gen,
- btrfs_disk_key_objectid(&disk_key),
- level, c->start, 0);
+ mid = (c_nritems + 1) / 2;
+ btrfs_node_key(c, &disk_key, mid);
+
+ split = btrfs_alloc_free_block(trans, root, root->fs_info->nodesize,
+ root->root_key.objectid,
+ &disk_key, level, c->start, 0);
if (IS_ERR(split))
return PTR_ERR(split);
- btrfs_set_header_flags(split, btrfs_header_flags(c));
+ memset_extent_buffer(split, 0, 0, sizeof(struct btrfs_header));
btrfs_set_header_level(split, btrfs_header_level(c));
btrfs_set_header_bytenr(split, split->start);
btrfs_set_header_generation(split, trans->transid);
+ btrfs_set_header_backref_rev(split, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(split, root->root_key.objectid);
write_extent_buffer(split, root->fs_info->fsid,
- (unsigned long)btrfs_header_fsid(split),
- BTRFS_FSID_SIZE);
+ btrfs_header_fsid(), BTRFS_FSID_SIZE);
+ write_extent_buffer(split, root->fs_info->chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(split),
+ BTRFS_UUID_SIZE);
- mid = (c_nritems + 1) / 2;
copy_extent_buffer(split, c,
btrfs_node_key_ptr_offset(0),
btrfs_mark_buffer_dirty(c);
btrfs_mark_buffer_dirty(split);
- btrfs_node_key(split, &disk_key, 0);
wret = insert_ptr(trans, root, path, &disk_key, split->start,
path->slots[level + 1] + 1,
level + 1);
*/
int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf)
{
+ u32 nodesize = (root ? BTRFS_LEAF_DATA_SIZE(root->fs_info) : leaf->len);
int nritems = btrfs_header_nritems(leaf);
int ret;
- ret = BTRFS_LEAF_DATA_SIZE(root) - leaf_space_used(leaf, 0, nritems);
+ ret = nodesize - leaf_space_used(leaf, 0, nritems);
if (ret < 0) {
- printk("leaf free space ret %d, leaf data size %lu, used %d nritems %d\n",
- ret, (unsigned long) BTRFS_LEAF_DATA_SIZE(root),
- leaf_space_used(leaf, 0, nritems), nritems);
+ printk("leaf free space ret %d, leaf data size %u, used %d nritems %d\n",
+ ret, nodesize, leaf_space_used(leaf, 0, nritems),
+ nritems);
}
return ret;
}
struct extent_buffer *right;
struct extent_buffer *upper;
struct btrfs_disk_key disk_key;
+ struct btrfs_fs_info *fs_info = root->fs_info;
int slot;
u32 i;
int free_space;
if (slot >= btrfs_header_nritems(upper) - 1)
return 1;
- right = read_tree_block(root, btrfs_node_blockptr(upper, slot + 1),
- root->leafsize);
+ right = read_node_slot(fs_info, upper, slot + 1);
+ if (!extent_buffer_uptodate(right)) {
+ if (IS_ERR(right))
+ return PTR_ERR(right);
+ return -EIO;
+ }
free_space = btrfs_leaf_free_space(root, right);
- if (free_space < data_size + sizeof(struct btrfs_item)) {
+ if (free_space < data_size) {
free_extent_buffer(right);
return 1;
}
return 1;
}
free_space = btrfs_leaf_free_space(root, right);
- if (free_space < data_size + sizeof(struct btrfs_item)) {
+ if (free_space < data_size) {
free_extent_buffer(right);
return 1;
}
i = left_nritems - 1;
while (i >= nr) {
- item = btrfs_item_nr(left, i);
+ item = btrfs_item_nr(i);
if (path->slots[0] == i)
push_space += data_size + sizeof(*item);
right_nritems = btrfs_header_nritems(right);
push_space = btrfs_item_end_nr(left, left_nritems - push_items);
- push_space -= leaf_data_end(root, left);
+ push_space -= leaf_data_end(fs_info, left);
/* make room in the right data area */
- data_end = leaf_data_end(root, right);
+ data_end = leaf_data_end(fs_info, right);
memmove_extent_buffer(right,
btrfs_leaf_data(right) + data_end - push_space,
btrfs_leaf_data(right) + data_end,
- BTRFS_LEAF_DATA_SIZE(root) - data_end);
+ BTRFS_LEAF_DATA_SIZE(root->fs_info) - data_end);
/* copy from the left data area */
copy_extent_buffer(right, left, btrfs_leaf_data(right) +
- BTRFS_LEAF_DATA_SIZE(root) - push_space,
- btrfs_leaf_data(left) + leaf_data_end(root, left),
+ BTRFS_LEAF_DATA_SIZE(root->fs_info) - push_space,
+ btrfs_leaf_data(left) + leaf_data_end(fs_info, left),
push_space);
memmove_extent_buffer(right, btrfs_item_nr_offset(push_items),
/* update the item pointers */
right_nritems += push_items;
btrfs_set_header_nritems(right, right_nritems);
- push_space = BTRFS_LEAF_DATA_SIZE(root);
+ push_space = BTRFS_LEAF_DATA_SIZE(root->fs_info);
for (i = 0; i < right_nritems; i++) {
- item = btrfs_item_nr(right, i);
+ item = btrfs_item_nr(i);
push_space -= btrfs_item_size(right, item);
btrfs_set_item_offset(right, item, push_space);
}
struct btrfs_disk_key disk_key;
struct extent_buffer *right = path->nodes[0];
struct extent_buffer *left;
+ struct btrfs_fs_info *fs_info = root->fs_info;
int slot;
int i;
int free_space;
u32 right_nritems;
u32 nr;
int ret = 0;
- int wret;
u32 this_item_size;
u32 old_left_item_size;
return 1;
}
- left = read_tree_block(root, btrfs_node_blockptr(path->nodes[1],
- slot - 1), root->leafsize);
+ left = read_node_slot(fs_info, path->nodes[1], slot - 1);
free_space = btrfs_leaf_free_space(root, left);
- if (free_space < data_size + sizeof(struct btrfs_item)) {
+ if (free_space < data_size) {
free_extent_buffer(left);
return 1;
}
}
free_space = btrfs_leaf_free_space(root, left);
- if (free_space < data_size + sizeof(struct btrfs_item)) {
+ if (free_space < data_size) {
free_extent_buffer(left);
return 1;
}
nr = right_nritems - 1;
for (i = 0; i < nr; i++) {
- item = btrfs_item_nr(right, i);
+ item = btrfs_item_nr(i);
if (path->slots[0] == i)
push_space += data_size + sizeof(*item);
btrfs_item_nr_offset(0),
push_items * sizeof(struct btrfs_item));
- push_space = BTRFS_LEAF_DATA_SIZE(root) -
+ push_space = BTRFS_LEAF_DATA_SIZE(root->fs_info) -
btrfs_item_offset_nr(right, push_items -1);
copy_extent_buffer(left, right, btrfs_leaf_data(left) +
- leaf_data_end(root, left) - push_space,
+ leaf_data_end(fs_info, left) - push_space,
btrfs_leaf_data(right) +
btrfs_item_offset_nr(right, push_items - 1),
push_space);
old_left_nritems = btrfs_header_nritems(left);
- BUG_ON(old_left_nritems < 0);
+ BUG_ON(old_left_nritems == 0);
old_left_item_size = btrfs_item_offset_nr(left, old_left_nritems - 1);
for (i = old_left_nritems; i < old_left_nritems + push_items; i++) {
u32 ioff;
- item = btrfs_item_nr(left, i);
+ item = btrfs_item_nr(i);
ioff = btrfs_item_offset(left, item);
btrfs_set_item_offset(left, item,
- ioff - (BTRFS_LEAF_DATA_SIZE(root) - old_left_item_size));
+ ioff - (BTRFS_LEAF_DATA_SIZE(root->fs_info) -
+ old_left_item_size));
}
btrfs_set_header_nritems(left, old_left_nritems + push_items);
if (push_items < right_nritems) {
push_space = btrfs_item_offset_nr(right, push_items - 1) -
- leaf_data_end(root, right);
+ leaf_data_end(fs_info, right);
memmove_extent_buffer(right, btrfs_leaf_data(right) +
- BTRFS_LEAF_DATA_SIZE(root) - push_space,
+ BTRFS_LEAF_DATA_SIZE(root->fs_info) -
+ push_space,
btrfs_leaf_data(right) +
- leaf_data_end(root, right), push_space);
+ leaf_data_end(fs_info, right),
+ push_space);
memmove_extent_buffer(right, btrfs_item_nr_offset(0),
btrfs_item_nr_offset(push_items),
}
right_nritems -= push_items;
btrfs_set_header_nritems(right, right_nritems);
- push_space = BTRFS_LEAF_DATA_SIZE(root);
+ push_space = BTRFS_LEAF_DATA_SIZE(root->fs_info);
for (i = 0; i < right_nritems; i++) {
- item = btrfs_item_nr(right, i);
+ item = btrfs_item_nr(i);
push_space = push_space - btrfs_item_size(right, item);
btrfs_set_item_offset(right, item, push_space);
}
btrfs_mark_buffer_dirty(right);
btrfs_item_key(right, &disk_key, 0);
- wret = fixup_low_keys(trans, root, path, &disk_key, 1);
- if (wret)
- ret = wret;
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
/* then fixup the leaf pointer in the path */
if (path->slots[0] < push_items) {
*
* returns 0 if all went well and < 0 on failure.
*/
-static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_key *ins_key,
- struct btrfs_path *path, int data_size, int extend)
+static noinline int copy_for_split(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct extent_buffer *l,
+ struct extent_buffer *right,
+ int slot, int mid, int nritems)
+{
+ int data_copy_size;
+ int rt_data_off;
+ int i;
+ int ret = 0;
+ int wret;
+ struct btrfs_disk_key disk_key;
+
+ nritems = nritems - mid;
+ btrfs_set_header_nritems(right, nritems);
+ data_copy_size = btrfs_item_end_nr(l, mid) -
+ leaf_data_end(root->fs_info, l);
+
+ copy_extent_buffer(right, l, btrfs_item_nr_offset(0),
+ btrfs_item_nr_offset(mid),
+ nritems * sizeof(struct btrfs_item));
+
+ copy_extent_buffer(right, l,
+ btrfs_leaf_data(right) +
+ BTRFS_LEAF_DATA_SIZE(root->fs_info) -
+ data_copy_size, btrfs_leaf_data(l) +
+ leaf_data_end(root->fs_info, l), data_copy_size);
+
+ rt_data_off = BTRFS_LEAF_DATA_SIZE(root->fs_info) -
+ btrfs_item_end_nr(l, mid);
+
+ for (i = 0; i < nritems; i++) {
+ struct btrfs_item *item = btrfs_item_nr(i);
+ u32 ioff = btrfs_item_offset(right, item);
+ btrfs_set_item_offset(right, item, ioff + rt_data_off);
+ }
+
+ btrfs_set_header_nritems(l, mid);
+ ret = 0;
+ btrfs_item_key(right, &disk_key, 0);
+ wret = insert_ptr(trans, root, path, &disk_key, right->start,
+ path->slots[1] + 1, 1);
+ if (wret)
+ ret = wret;
+
+ btrfs_mark_buffer_dirty(right);
+ btrfs_mark_buffer_dirty(l);
+ BUG_ON(path->slots[0] != slot);
+
+ if (mid <= slot) {
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
+ path->slots[0] -= mid;
+ path->slots[1] += 1;
+ } else {
+ free_extent_buffer(right);
+ }
+
+ BUG_ON(path->slots[0] < 0);
+
+ return ret;
+}
+
+/*
+ * split the path's leaf in two, making sure there is at least data_size
+ * available for the resulting leaf level of the path.
+ *
+ * returns 0 if all went well and < 0 on failure.
+ */
+static noinline int split_leaf(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_key *ins_key,
+ struct btrfs_path *path, int data_size,
+ int extend)
{
- u64 root_gen;
+ struct btrfs_disk_key disk_key;
struct extent_buffer *l;
u32 nritems;
int mid;
int slot;
struct extent_buffer *right;
- int space_needed = data_size + sizeof(struct btrfs_item);
- int data_copy_size;
- int rt_data_off;
- int i;
int ret = 0;
int wret;
- int double_split;
+ int split;
int num_doubles = 0;
- struct btrfs_disk_key disk_key;
-
- if (extend)
- space_needed = data_size;
- if (root->ref_cows)
- root_gen = trans->transid;
- else
- root_gen = 0;
+ l = path->nodes[0];
+ slot = path->slots[0];
+ if (extend && data_size + btrfs_item_size_nr(l, slot) +
+ sizeof(struct btrfs_item) > BTRFS_LEAF_DATA_SIZE(root->fs_info))
+ return -EOVERFLOW;
/* first try to make some room by pushing left and right */
- if (ins_key->type != BTRFS_DIR_ITEM_KEY) {
+ if (data_size && ins_key->type != BTRFS_DIR_ITEM_KEY) {
wret = push_leaf_right(trans, root, path, data_size, 0);
- if (wret < 0) {
+ if (wret < 0)
return wret;
- }
if (wret) {
wret = push_leaf_left(trans, root, path, data_size, 0);
if (wret < 0)
l = path->nodes[0];
/* did the pushes work? */
- if (btrfs_leaf_free_space(root, l) >= space_needed)
+ if (btrfs_leaf_free_space(root, l) >= data_size)
return 0;
}
return ret;
}
again:
- double_split = 0;
+ split = 1;
l = path->nodes[0];
slot = path->slots[0];
nritems = btrfs_header_nritems(l);
- mid = (nritems + 1)/ 2;
-
- btrfs_item_key(l, &disk_key, 0);
+ mid = (nritems + 1) / 2;
- right = __btrfs_alloc_free_block(trans, root, root->leafsize,
- root->root_key.objectid,
- root_gen, disk_key.objectid, 0,
- l->start, 0);
- if (IS_ERR(right))
- return PTR_ERR(right);
-
- memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(right, right->start);
- btrfs_set_header_generation(right, trans->transid);
- btrfs_set_header_owner(right, root->root_key.objectid);
- btrfs_set_header_level(right, 0);
- write_extent_buffer(right, root->fs_info->fsid,
- (unsigned long)btrfs_header_fsid(right),
- BTRFS_FSID_SIZE);
if (mid <= slot) {
if (nritems == 1 ||
- leaf_space_used(l, mid, nritems - mid) + space_needed >
- BTRFS_LEAF_DATA_SIZE(root)) {
+ leaf_space_used(l, mid, nritems - mid) + data_size >
+ BTRFS_LEAF_DATA_SIZE(root->fs_info)) {
if (slot >= nritems) {
- btrfs_cpu_key_to_disk(&disk_key, ins_key);
- btrfs_set_header_nritems(right, 0);
- wret = insert_ptr(trans, root, path,
- &disk_key, right->start,
- path->slots[1] + 1, 1);
- if (wret)
- ret = wret;
- free_extent_buffer(path->nodes[0]);
- path->nodes[0] = right;
- path->slots[0] = 0;
- path->slots[1] += 1;
- return ret;
- }
- mid = slot;
- if (mid != nritems &&
- leaf_space_used(l, mid, nritems - mid) +
- space_needed > BTRFS_LEAF_DATA_SIZE(root)) {
- double_split = 1;
+ split = 0;
+ } else {
+ mid = slot;
+ if (mid != nritems &&
+ leaf_space_used(l, mid, nritems - mid) +
+ data_size >
+ BTRFS_LEAF_DATA_SIZE(root->fs_info)) {
+ split = 2;
+ }
}
}
} else {
- if (leaf_space_used(l, 0, mid + 1) + space_needed >
- BTRFS_LEAF_DATA_SIZE(root)) {
- if (!extend && slot == 0) {
- btrfs_cpu_key_to_disk(&disk_key, ins_key);
- btrfs_set_header_nritems(right, 0);
- wret = insert_ptr(trans, root, path,
- &disk_key,
- right->start,
- path->slots[1], 1);
- if (wret)
- ret = wret;
- free_extent_buffer(path->nodes[0]);
- path->nodes[0] = right;
- path->slots[0] = 0;
- if (path->slots[1] == 0) {
- wret = fixup_low_keys(trans, root,
- path, &disk_key, 1);
- if (wret)
- ret = wret;
- }
- return ret;
- } else if (extend && slot == 0) {
+ if (leaf_space_used(l, 0, mid) + data_size >
+ BTRFS_LEAF_DATA_SIZE(root->fs_info)) {
+ if (!extend && data_size && slot == 0) {
+ split = 0;
+ } else if ((extend || !data_size) && slot == 0) {
mid = 1;
} else {
mid = slot;
if (mid != nritems &&
leaf_space_used(l, mid, nritems - mid) +
- space_needed > BTRFS_LEAF_DATA_SIZE(root)) {
- double_split = 1;
+ data_size >
+ BTRFS_LEAF_DATA_SIZE(root->fs_info)) {
+ split = 2 ;
}
}
}
}
- nritems = nritems - mid;
- btrfs_set_header_nritems(right, nritems);
- data_copy_size = btrfs_item_end_nr(l, mid) - leaf_data_end(root, l);
+
+ if (split == 0)
+ btrfs_cpu_key_to_disk(&disk_key, ins_key);
+ else
+ btrfs_item_key(l, &disk_key, mid);
- copy_extent_buffer(right, l, btrfs_item_nr_offset(0),
- btrfs_item_nr_offset(mid),
- nritems * sizeof(struct btrfs_item));
+ right = btrfs_alloc_free_block(trans, root, root->fs_info->nodesize,
+ root->root_key.objectid,
+ &disk_key, 0, l->start, 0);
+ if (IS_ERR(right)) {
+ BUG_ON(1);
+ return PTR_ERR(right);
+ }
- copy_extent_buffer(right, l,
- btrfs_leaf_data(right) + BTRFS_LEAF_DATA_SIZE(root) -
- data_copy_size, btrfs_leaf_data(l) +
- leaf_data_end(root, l), data_copy_size);
+ memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header));
+ btrfs_set_header_bytenr(right, right->start);
+ btrfs_set_header_generation(right, trans->transid);
+ btrfs_set_header_backref_rev(right, BTRFS_MIXED_BACKREF_REV);
+ btrfs_set_header_owner(right, root->root_key.objectid);
+ btrfs_set_header_level(right, 0);
+ write_extent_buffer(right, root->fs_info->fsid,
+ btrfs_header_fsid(), BTRFS_FSID_SIZE);
+
+ write_extent_buffer(right, root->fs_info->chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(right),
+ BTRFS_UUID_SIZE);
+
+ if (split == 0) {
+ if (mid <= slot) {
+ btrfs_set_header_nritems(right, 0);
+ wret = insert_ptr(trans, root, path,
+ &disk_key, right->start,
+ path->slots[1] + 1, 1);
+ if (wret)
+ ret = wret;
- rt_data_off = BTRFS_LEAF_DATA_SIZE(root) -
- btrfs_item_end_nr(l, mid);
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
+ path->slots[0] = 0;
+ path->slots[1] += 1;
+ } else {
+ btrfs_set_header_nritems(right, 0);
+ wret = insert_ptr(trans, root, path,
+ &disk_key,
+ right->start,
+ path->slots[1], 1);
+ if (wret)
+ ret = wret;
+ free_extent_buffer(path->nodes[0]);
+ path->nodes[0] = right;
+ path->slots[0] = 0;
+ if (path->slots[1] == 0) {
+ btrfs_fixup_low_keys(root, path,
+ &disk_key, 1);
+ }
+ }
+ btrfs_mark_buffer_dirty(right);
+ return ret;
+ }
- for (i = 0; i < nritems; i++) {
- struct btrfs_item *item = btrfs_item_nr(right, i);
- u32 ioff = btrfs_item_offset(right, item);
- btrfs_set_item_offset(right, item, ioff + rt_data_off);
+ ret = copy_for_split(trans, root, path, l, right, slot, mid, nritems);
+ BUG_ON(ret);
+
+ if (split == 2) {
+ BUG_ON(num_doubles != 0);
+ num_doubles++;
+ goto again;
}
- btrfs_set_header_nritems(l, mid);
- ret = 0;
- btrfs_item_key(right, &disk_key, 0);
- wret = insert_ptr(trans, root, path, &disk_key, right->start,
- path->slots[1] + 1, 1);
- if (wret)
- ret = wret;
+ return ret;
+}
- btrfs_mark_buffer_dirty(right);
- btrfs_mark_buffer_dirty(l);
- BUG_ON(path->slots[0] != slot);
+/*
+ * This function splits a single item into two items,
+ * giving 'new_key' to the new item and splitting the
+ * old one at split_offset (from the start of the item).
+ *
+ * The path may be released by this operation. After
+ * the split, the path is pointing to the old item. The
+ * new item is going to be in the same node as the old one.
+ *
+ * Note, the item being split must be smaller enough to live alone on
+ * a tree block with room for one extra struct btrfs_item
+ *
+ * This allows us to split the item in place, keeping a lock on the
+ * leaf the entire time.
+ */
+int btrfs_split_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_key *new_key,
+ unsigned long split_offset)
+{
+ u32 item_size;
+ struct extent_buffer *leaf;
+ struct btrfs_key orig_key;
+ struct btrfs_item *item;
+ struct btrfs_item *new_item;
+ int ret = 0;
+ int slot;
+ u32 nritems;
+ u32 orig_offset;
+ struct btrfs_disk_key disk_key;
+ char *buf;
- if (mid <= slot) {
- free_extent_buffer(path->nodes[0]);
- path->nodes[0] = right;
- path->slots[0] -= mid;
- path->slots[1] += 1;
- } else
- free_extent_buffer(right);
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &orig_key, path->slots[0]);
+ if (btrfs_leaf_free_space(root, leaf) >= sizeof(struct btrfs_item))
+ goto split;
- BUG_ON(path->slots[0] < 0);
+ item_size = btrfs_item_size_nr(leaf, path->slots[0]);
+ btrfs_release_path(path);
- if (double_split) {
- BUG_ON(num_doubles != 0);
- num_doubles++;
- goto again;
+ path->search_for_split = 1;
+
+ ret = btrfs_search_slot(trans, root, &orig_key, path, 0, 1);
+ path->search_for_split = 0;
+
+ /* if our item isn't there or got smaller, return now */
+ if (ret != 0 || item_size != btrfs_item_size_nr(path->nodes[0],
+ path->slots[0])) {
+ return -EAGAIN;
}
+
+ ret = split_leaf(trans, root, &orig_key, path, 0, 0);
+ BUG_ON(ret);
+
+ BUG_ON(btrfs_leaf_free_space(root, leaf) < sizeof(struct btrfs_item));
+ leaf = path->nodes[0];
+
+split:
+ item = btrfs_item_nr(path->slots[0]);
+ orig_offset = btrfs_item_offset(leaf, item);
+ item_size = btrfs_item_size(leaf, item);
+
+
+ buf = kmalloc(item_size, GFP_NOFS);
+ BUG_ON(!buf);
+ read_extent_buffer(leaf, buf, btrfs_item_ptr_offset(leaf,
+ path->slots[0]), item_size);
+ slot = path->slots[0] + 1;
+ leaf = path->nodes[0];
+
+ nritems = btrfs_header_nritems(leaf);
+
+ if (slot < nritems) {
+ /* shift the items */
+ memmove_extent_buffer(leaf, btrfs_item_nr_offset(slot + 1),
+ btrfs_item_nr_offset(slot),
+ (nritems - slot) * sizeof(struct btrfs_item));
+
+ }
+
+ btrfs_cpu_key_to_disk(&disk_key, new_key);
+ btrfs_set_item_key(leaf, &disk_key, slot);
+
+ new_item = btrfs_item_nr(slot);
+
+ btrfs_set_item_offset(leaf, new_item, orig_offset);
+ btrfs_set_item_size(leaf, new_item, item_size - split_offset);
+
+ btrfs_set_item_offset(leaf, item,
+ orig_offset + item_size - split_offset);
+ btrfs_set_item_size(leaf, item, split_offset);
+
+ btrfs_set_header_nritems(leaf, nritems + 1);
+
+ /* write the data for the start of the original item */
+ write_extent_buffer(leaf, buf,
+ btrfs_item_ptr_offset(leaf, path->slots[0]),
+ split_offset);
+
+ /* write the data for the new item */
+ write_extent_buffer(leaf, buf + split_offset,
+ btrfs_item_ptr_offset(leaf, slot),
+ item_size - split_offset);
+ btrfs_mark_buffer_dirty(leaf);
+
+ ret = 0;
+ if (btrfs_leaf_free_space(root, leaf) < 0) {
+ btrfs_print_leaf(root, leaf);
+ BUG();
+ }
+ kfree(buf);
return ret;
}
-int btrfs_truncate_item(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
- struct btrfs_path *path,
+int btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path,
u32 new_size, int from_end)
{
int ret = 0;
int slot;
- int slot_orig;
struct extent_buffer *leaf;
struct btrfs_item *item;
u32 nritems;
unsigned int size_diff;
int i;
- slot_orig = path->slots[0];
leaf = path->nodes[0];
slot = path->slots[0];
return 0;
nritems = btrfs_header_nritems(leaf);
- data_end = leaf_data_end(root, leaf);
+ data_end = leaf_data_end(root->fs_info, leaf);
old_data_start = btrfs_item_offset_nr(leaf, slot);
/* first correct the data pointers */
for (i = slot; i < nritems; i++) {
u32 ioff;
- item = btrfs_item_nr(leaf, i);
+ item = btrfs_item_nr(i);
ioff = btrfs_item_offset(leaf, item);
btrfs_set_item_offset(leaf, item, ioff + size_diff);
}
btrfs_set_disk_key_offset(&disk_key, offset + size_diff);
btrfs_set_item_key(leaf, &disk_key, slot);
if (slot == 0)
- fixup_low_keys(trans, root, path, &disk_key, 1);
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
}
- item = btrfs_item_nr(leaf, slot);
+ item = btrfs_item_nr(slot);
btrfs_set_item_size(leaf, item, new_size);
btrfs_mark_buffer_dirty(leaf);
return ret;
}
-int btrfs_extend_item(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct btrfs_path *path,
+int btrfs_extend_item(struct btrfs_root *root, struct btrfs_path *path,
u32 data_size)
{
int ret = 0;
int slot;
- int slot_orig;
struct extent_buffer *leaf;
struct btrfs_item *item;
u32 nritems;
unsigned int old_size;
int i;
- slot_orig = path->slots[0];
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
- data_end = leaf_data_end(root, leaf);
+ data_end = leaf_data_end(root->fs_info, leaf);
if (btrfs_leaf_free_space(root, leaf) < data_size) {
btrfs_print_leaf(root, leaf);
/* first correct the data pointers */
for (i = slot; i < nritems; i++) {
u32 ioff;
- item = btrfs_item_nr(leaf, i);
+ item = btrfs_item_nr(i);
ioff = btrfs_item_offset(leaf, item);
btrfs_set_item_offset(leaf, item, ioff - data_size);
}
data_end = old_data;
old_size = btrfs_item_size_nr(leaf, slot);
- item = btrfs_item_nr(leaf, slot);
+ item = btrfs_item_nr(slot);
btrfs_set_item_size(leaf, item, old_size + data_size);
btrfs_mark_buffer_dirty(leaf);
struct btrfs_item *item;
int ret = 0;
int slot;
- int slot_orig;
int i;
u32 nritems;
u32 total_size = 0;
if (!root->node)
BUG();
- total_size = total_data + (nr - 1) * sizeof(struct btrfs_item);
+ total_size = total_data + nr * sizeof(struct btrfs_item);
ret = btrfs_search_slot(trans, root, cpu_key, path, total_size, 1);
if (ret == 0) {
return -EEXIST;
if (ret < 0)
goto out;
- slot_orig = path->slots[0];
leaf = path->nodes[0];
nritems = btrfs_header_nritems(leaf);
- data_end = leaf_data_end(root, leaf);
+ data_end = leaf_data_end(root->fs_info, leaf);
- if (btrfs_leaf_free_space(root, leaf) <
- sizeof(struct btrfs_item) + total_size) {
+ if (btrfs_leaf_free_space(root, leaf) < total_size) {
btrfs_print_leaf(root, leaf);
printk("not enough freespace need %u have %d\n",
total_size, btrfs_leaf_free_space(root, leaf));
slot = path->slots[0];
BUG_ON(slot < 0);
- if (slot != nritems) {
- int i;
+ if (slot < nritems) {
unsigned int old_data = btrfs_item_end_nr(leaf, slot);
if (old_data < data_end) {
for (i = slot; i < nritems; i++) {
u32 ioff;
- item = btrfs_item_nr(leaf, i);
+ item = btrfs_item_nr(i);
ioff = btrfs_item_offset(leaf, item);
btrfs_set_item_offset(leaf, item, ioff - total_data);
}
for (i = 0; i < nr; i++) {
btrfs_cpu_key_to_disk(&disk_key, cpu_key + i);
btrfs_set_item_key(leaf, &disk_key, slot + i);
- item = btrfs_item_nr(leaf, slot + i);
+ item = btrfs_item_nr(slot + i);
btrfs_set_item_offset(leaf, item, data_end - data_size[i]);
data_end -= data_size[i];
btrfs_set_item_size(leaf, item, data_size[i]);
ret = 0;
if (slot == 0) {
btrfs_cpu_key_to_disk(&disk_key, cpu_key);
- ret = fixup_low_keys(trans, root, path, &disk_key, 1);
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
}
if (btrfs_leaf_free_space(root, leaf) < 0) {
unsigned long ptr;
path = btrfs_alloc_path();
- BUG_ON(!path);
+ if (!path)
+ return -ENOMEM;
+
ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
if (!ret) {
leaf = path->nodes[0];
* continuing all the way the root if required. The root is converted into
* a leaf if all the nodes are emptied.
*/
-static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct btrfs_path *path, int level, int slot)
+int btrfs_del_ptr(struct btrfs_root *root, struct btrfs_path *path,
+ int level, int slot)
{
struct extent_buffer *parent = path->nodes[level];
u32 nritems;
int ret = 0;
- int wret;
nritems = btrfs_header_nritems(parent);
- if (slot != nritems -1) {
+ if (slot < nritems - 1) {
+ /* shift the items */
memmove_extent_buffer(parent,
btrfs_node_key_ptr_offset(slot),
btrfs_node_key_ptr_offset(slot + 1),
struct btrfs_disk_key disk_key;
btrfs_node_key(parent, &disk_key, 0);
- wret = fixup_low_keys(trans, root, path, &disk_key, level + 1);
- if (wret)
- ret = wret;
+ btrfs_fixup_low_keys(root, path, &disk_key, level + 1);
}
btrfs_mark_buffer_dirty(parent);
return ret;
}
/*
+ * a helper function to delete the leaf pointed to by path->slots[1] and
+ * path->nodes[1].
+ *
+ * This deletes the pointer in path->nodes[1] and frees the leaf
+ * block extent. zero is returned if it all worked out, < 0 otherwise.
+ *
+ * The path must have already been setup for deleting the leaf, including
+ * all the proper balancing. path->nodes[1] must be locked.
+ */
+static noinline int btrfs_del_leaf(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct extent_buffer *leaf)
+{
+ int ret;
+
+ WARN_ON(btrfs_header_generation(leaf) != trans->transid);
+ ret = btrfs_del_ptr(root, path, 1, path->slots[1]);
+ if (ret)
+ return ret;
+
+ ret = btrfs_free_extent(trans, root, leaf->start, leaf->len,
+ 0, root->root_key.objectid, 0, 0);
+ return ret;
+}
+
+/*
* delete the item at the leaf level in path. If that empties
* the leaf, remove it from the tree
*/
nritems = btrfs_header_nritems(leaf);
if (slot + nr != nritems) {
- int i;
- int data_end = leaf_data_end(root, leaf);
+ int data_end = leaf_data_end(root->fs_info, leaf);
memmove_extent_buffer(leaf, btrfs_leaf_data(leaf) +
data_end + dsize,
for (i = slot + nr; i < nritems; i++) {
u32 ioff;
- item = btrfs_item_nr(leaf, i);
+ item = btrfs_item_nr(i);
ioff = btrfs_item_offset(leaf, item);
btrfs_set_item_offset(leaf, item, ioff + dsize);
}
if (leaf == root->node) {
btrfs_set_header_level(leaf, 0);
} else {
- u64 root_gen = btrfs_header_generation(path->nodes[1]);
clean_tree_block(trans, root, leaf);
- wait_on_tree_block_writeback(root, leaf);
- wret = del_ptr(trans, root, path, 1, path->slots[1]);
- if (wret)
- ret = wret;
- wret = btrfs_free_extent(trans, root,
- leaf->start, leaf->len,
- btrfs_header_owner(path->nodes[1]),
- root_gen, 0, 0, 1);
+ wret = btrfs_del_leaf(trans, root, path, leaf);
+ BUG_ON(ret);
if (wret)
ret = wret;
}
struct btrfs_disk_key disk_key;
btrfs_item_key(leaf, &disk_key, 0);
- wret = fixup_low_keys(trans, root, path,
- &disk_key, 1);
- if (wret)
- ret = wret;
+ btrfs_fixup_low_keys(root, path, &disk_key, 1);
}
/* delete the leaf if it is mostly empty */
- if (used < BTRFS_LEAF_DATA_SIZE(root) / 4) {
+ if (used < BTRFS_LEAF_DATA_SIZE(root->fs_info) / 4) {
/* push_leaf_left fixes the path.
* make sure the path still points to our leaf
* for possible call to del_ptr below
}
if (btrfs_header_nritems(leaf) == 0) {
- u64 root_gen;
- u64 bytenr = leaf->start;
- u32 blocksize = leaf->len;
-
- root_gen = btrfs_header_generation(
- path->nodes[1]);
-
clean_tree_block(trans, root, leaf);
- wait_on_tree_block_writeback(root, leaf);
-
- wret = del_ptr(trans, root, path, 1, slot);
- if (wret)
- ret = wret;
-
+ path->slots[1] = slot;
+ ret = btrfs_del_leaf(trans, root, path, leaf);
+ BUG_ON(ret);
free_extent_buffer(leaf);
- wret = btrfs_free_extent(trans, root, bytenr,
- blocksize,
- btrfs_header_owner(path->nodes[1]),
- root_gen, 0, 0, 1);
- if (wret)
- ret = wret;
+
} else {
btrfs_mark_buffer_dirty(leaf);
free_extent_buffer(leaf);
*/
int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
{
- u64 bytenr;
int slot;
int level = 1;
struct extent_buffer *c;
struct extent_buffer *next = NULL;
+ struct btrfs_fs_info *fs_info = root->fs_info;
while(level < BTRFS_MAX_LEVEL) {
if (!path->nodes[level])
}
slot--;
- bytenr = btrfs_node_blockptr(c, slot);
- if (next)
- free_extent_buffer(next);
-
- next = read_tree_block(root, bytenr,
- btrfs_level_size(root, level - 1));
+ next = read_node_slot(fs_info, c, slot);
+ if (!extent_buffer_uptodate(next)) {
+ if (IS_ERR(next))
+ return PTR_ERR(next);
+ return -EIO;
+ }
break;
}
path->slots[level] = slot;
path->slots[level] = slot;
if (!level)
break;
- next = read_tree_block(root, btrfs_node_blockptr(next, slot),
- btrfs_level_size(root, level - 1));
+ next = read_node_slot(fs_info, next, slot);
+ if (!extent_buffer_uptodate(next)) {
+ if (IS_ERR(next))
+ return PTR_ERR(next);
+ return -EIO;
+ }
}
return 0;
}
{
int slot;
int level = 1;
- u64 bytenr;
struct extent_buffer *c;
struct extent_buffer *next = NULL;
+ struct btrfs_fs_info *fs_info = root->fs_info;
while(level < BTRFS_MAX_LEVEL) {
if (!path->nodes[level])
continue;
}
- bytenr = btrfs_node_blockptr(c, slot);
- if (next)
- free_extent_buffer(next);
-
if (path->reada)
reada_for_search(root, path, level, slot, 0);
- next = read_tree_block(root, bytenr,
- btrfs_level_size(root, level -1));
+ next = read_node_slot(fs_info, c, slot);
+ if (!extent_buffer_uptodate(next))
+ return -EIO;
break;
}
path->slots[level] = slot;
break;
if (path->reada)
reada_for_search(root, path, level, 0, 0);
- next = read_tree_block(root, btrfs_node_blockptr(next, 0),
- btrfs_level_size(root, level - 1));
+ next = read_node_slot(fs_info, next, 0);
+ if (!extent_buffer_uptodate(next))
+ return -EIO;
}
return 0;
}
+
+int btrfs_previous_item(struct btrfs_root *root,
+ struct btrfs_path *path, u64 min_objectid,
+ int type)
+{
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+ u32 nritems;
+ int ret;
+
+ while(1) {
+ if (path->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, path);
+ if (ret != 0)
+ return ret;
+ } else {
+ path->slots[0]--;
+ }
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ if (nritems == 0)
+ return 1;
+ if (path->slots[0] == nritems)
+ path->slots[0]--;
+
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ if (found_key.objectid < min_objectid)
+ break;
+ if (found_key.type == type)
+ return 0;
+ if (found_key.objectid == min_objectid &&
+ found_key.type < type)
+ break;
+ }
+ return 1;
+}
+
+/*
+ * search in extent tree to find a previous Metadata/Data extent item with
+ * min objecitd.
+ *
+ * returns 0 if something is found, 1 if nothing was found and < 0 on error
+ */
+int btrfs_previous_extent_item(struct btrfs_root *root,
+ struct btrfs_path *path, u64 min_objectid)
+{
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+ u32 nritems;
+ int ret;
+
+ while (1) {
+ if (path->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, path);
+ if (ret != 0)
+ return ret;
+ } else {
+ path->slots[0]--;
+ }
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ if (nritems == 0)
+ return 1;
+ if (path->slots[0] == nritems)
+ path->slots[0]--;
+
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ if (found_key.objectid < min_objectid)
+ break;
+ if (found_key.type == BTRFS_EXTENT_ITEM_KEY ||
+ found_key.type == BTRFS_METADATA_ITEM_KEY)
+ return 0;
+ if (found_key.objectid == min_objectid &&
+ found_key.type < BTRFS_EXTENT_ITEM_KEY)
+ break;
+ }
+ return 1;
+}
+
+/*
+ * Search in extent tree to found next meta/data extent
+ * Caller needs to check for no-hole or skinny metadata features.
+ */
+int btrfs_next_extent_item(struct btrfs_root *root,
+ struct btrfs_path *path, u64 max_objectid)
+{
+ struct btrfs_key found_key;
+ int ret;
+
+ while (1) {
+ ret = btrfs_next_item(root, path);
+ if (ret)
+ return ret;
+ btrfs_item_key_to_cpu(path->nodes[0], &found_key,
+ path->slots[0]);
+ if (found_key.objectid > max_objectid)
+ return 1;
+ if (found_key.type == BTRFS_EXTENT_ITEM_KEY ||
+ found_key.type == BTRFS_METADATA_ITEM_KEY)
+ return 0;
+ }
+}
projects / platform / upstream / btrfs-progs.git / blobdiff