* Boston, MA 021110-1307, USA.
*/
-#define _XOPEN_SOURCE 700
-#define __USE_XOPEN2K8
-#define __XOPEN2K8 /* due to an error in dirent.h, to get dirfd() */
-#define _GNU_SOURCE /* O_NOATIME */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/kdev_t.h>
#include <limits.h>
#include <blkid/blkid.h>
+#include <sys/vfs.h>
+#include <sys/statfs.h>
+#include <linux/magic.h>
+#include <getopt.h>
+#include <sys/utsname.h>
+#include <linux/version.h>
+
#include "kerncompat.h"
#include "radix-tree.h"
#include "ctree.h"
#include "utils.h"
#include "volumes.h"
#include "ioctl.h"
+#include "commands.h"
#ifndef BLKDISCARD
#define BLKDISCARD _IO(0x12,119)
#endif
-static int
-discard_blocks(int fd, u64 start, u64 len)
+static int btrfs_scan_done = 0;
+
+static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
+
+static int rand_seed_initlized = 0;
+static unsigned short rand_seed[3];
+
+const char *get_argv0_buf(void)
+{
+ return argv0_buf;
+}
+
+void fixup_argv0(char **argv, const char *token)
+{
+ int len = strlen(argv0_buf);
+
+ snprintf(argv0_buf + len, sizeof(argv0_buf) - len, " %s", token);
+ argv[0] = argv0_buf;
+}
+
+void set_argv0(char **argv)
+{
+ strncpy(argv0_buf, argv[0], sizeof(argv0_buf));
+ argv0_buf[sizeof(argv0_buf) - 1] = 0;
+}
+
+int check_argc_exact(int nargs, int expected)
+{
+ if (nargs < expected)
+ fprintf(stderr, "%s: too few arguments\n", argv0_buf);
+ if (nargs > expected)
+ fprintf(stderr, "%s: too many arguments\n", argv0_buf);
+
+ return nargs != expected;
+}
+
+int check_argc_min(int nargs, int expected)
+{
+ if (nargs < expected) {
+ fprintf(stderr, "%s: too few arguments\n", argv0_buf);
+ return 1;
+ }
+
+ return 0;
+}
+
+int check_argc_max(int nargs, int expected)
+{
+ if (nargs > expected) {
+ fprintf(stderr, "%s: too many arguments\n", argv0_buf);
+ return 1;
+ }
+
+ return 0;
+}
+
+
+/*
+ * Discard the given range in one go
+ */
+static int discard_range(int fd, u64 start, u64 len)
{
u64 range[2] = { start, len };
return 0;
}
+/*
+ * Discard blocks in the given range in 1G chunks, the process is interruptible
+ */
+static int discard_blocks(int fd, u64 start, u64 len)
+{
+ while (len > 0) {
+ /* 1G granularity */
+ u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
+ int ret;
+
+ ret = discard_range(fd, start, chunk_size);
+ if (ret)
+ return ret;
+ len -= chunk_size;
+ start += chunk_size;
+ }
+
+ return 0;
+}
+
static u64 reference_root_table[] = {
[1] = BTRFS_ROOT_TREE_OBJECTID,
[2] = BTRFS_EXTENT_TREE_OBJECTID,
[6] = BTRFS_CSUM_TREE_OBJECTID,
};
-int make_btrfs(int fd, const char *device, const char *label,
- u64 blocks[7], u64 num_bytes, u32 nodesize,
- u32 leafsize, u32 sectorsize, u32 stripesize, u64 features)
+int test_uuid_unique(char *fs_uuid)
{
- struct btrfs_super_block super;
- struct extent_buffer *buf;
- struct btrfs_root_item root_item;
- struct btrfs_disk_key disk_key;
- struct btrfs_extent_item *extent_item;
- struct btrfs_inode_item *inode_item;
- struct btrfs_chunk *chunk;
- struct btrfs_dev_item *dev_item;
- struct btrfs_dev_extent *dev_extent;
- u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
- u8 *ptr;
- int i;
+ int unique = 1;
+ blkid_dev_iterate iter = NULL;
+ blkid_dev dev = NULL;
+ blkid_cache cache = NULL;
+
+ if (blkid_get_cache(&cache, NULL) < 0) {
+ printf("ERROR: lblkid cache get failed\n");
+ return 1;
+ }
+ blkid_probe_all(cache);
+ iter = blkid_dev_iterate_begin(cache);
+ blkid_dev_set_search(iter, "UUID", fs_uuid);
+
+ while (blkid_dev_next(iter, &dev) == 0) {
+ dev = blkid_verify(cache, dev);
+ if (dev) {
+ unique = 0;
+ break;
+ }
+ }
+
+ blkid_dev_iterate_end(iter);
+ blkid_put_cache(cache);
+
+ return unique;
+}
+
+/*
+ * Reserve space from free_tree.
+ * The algorithm is very simple, find the first cache_extent with enough space
+ * and allocate from its beginning.
+ */
+static int reserve_free_space(struct cache_tree *free_tree, u64 len,
+ u64 *ret_start)
+{
+ struct cache_extent *cache;
+ int found = 0;
+
+ ASSERT(ret_start != NULL);
+ cache = first_cache_extent(free_tree);
+ while (cache) {
+ if (cache->size > len) {
+ found = 1;
+ *ret_start = cache->start;
+
+ cache->size -= len;
+ if (cache->size == 0) {
+ remove_cache_extent(free_tree, cache);
+ free(cache);
+ } else {
+ cache->start += len;
+ }
+ break;
+ }
+ cache = next_cache_extent(cache);
+ }
+ if (!found)
+ return -ENOSPC;
+ return 0;
+}
+
+static inline int write_temp_super(int fd, struct btrfs_super_block *sb,
+ u64 sb_bytenr)
+{
+ u32 crc = ~(u32)0;
int ret;
- u32 itemoff;
- u32 nritems = 0;
- u64 first_free;
- u64 ref_root;
- u32 array_size;
- u32 item_size;
- int skinny_metadata = !!(features &
- BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
- first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
- first_free &= ~((u64)sectorsize - 1);
+ crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
+ BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
+ btrfs_csum_final(crc, &sb->csum[0]);
+ ret = pwrite(fd, sb, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
+ if (ret < BTRFS_SUPER_INFO_SIZE)
+ ret = (ret < 0 ? -errno : -EIO);
+ else
+ ret = 0;
+ return ret;
+}
- memset(&super, 0, sizeof(super));
+/*
+ * Setup temporary superblock at cfg->super_bynter
+ * Needed info are extracted from cfg, and root_bytenr, chunk_bytenr
+ *
+ * For now sys chunk array will be empty and dev_item is empty too.
+ * They will be re-initialized at temp chunk tree setup.
+ *
+ * The superblock signature is not valid, denotes a partially created
+ * filesystem, needs to be finalized.
+ */
+static int setup_temp_super(int fd, struct btrfs_mkfs_config *cfg,
+ u64 root_bytenr, u64 chunk_bytenr)
+{
+ unsigned char chunk_uuid[BTRFS_UUID_SIZE];
+ char super_buf[BTRFS_SUPER_INFO_SIZE];
+ struct btrfs_super_block *super = (struct btrfs_super_block *)super_buf;
+ int ret;
- num_bytes = (num_bytes / sectorsize) * sectorsize;
- uuid_generate(super.fsid);
- uuid_generate(super.dev_item.uuid);
- uuid_generate(chunk_tree_uuid);
+ memset(super_buf, 0, BTRFS_SUPER_INFO_SIZE);
+ cfg->num_bytes = round_down(cfg->num_bytes, cfg->sectorsize);
- btrfs_set_super_bytenr(&super, blocks[0]);
- btrfs_set_super_num_devices(&super, 1);
- btrfs_set_super_magic(&super, BTRFS_MAGIC);
- btrfs_set_super_generation(&super, 1);
- btrfs_set_super_root(&super, blocks[1]);
- btrfs_set_super_chunk_root(&super, blocks[3]);
- btrfs_set_super_total_bytes(&super, num_bytes);
- btrfs_set_super_bytes_used(&super, 6 * leafsize);
- btrfs_set_super_sectorsize(&super, sectorsize);
- btrfs_set_super_leafsize(&super, leafsize);
- btrfs_set_super_nodesize(&super, nodesize);
- btrfs_set_super_stripesize(&super, stripesize);
- btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
- btrfs_set_super_chunk_root_generation(&super, 1);
- btrfs_set_super_cache_generation(&super, -1);
- btrfs_set_super_incompat_flags(&super, features);
- if (label)
- strncpy(super.label, label, BTRFS_LABEL_SIZE - 1);
+ if (*cfg->fs_uuid) {
+ if (uuid_parse(cfg->fs_uuid, super->fsid) != 0) {
+ error("cound not parse UUID: %s", cfg->fs_uuid);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (!test_uuid_unique(cfg->fs_uuid)) {
+ error("non-unique UUID: %s", cfg->fs_uuid);
+ ret = -EINVAL;
+ goto out;
+ }
+ } else {
+ uuid_generate(super->fsid);
+ uuid_unparse(super->fsid, cfg->fs_uuid);
+ }
+ uuid_generate(chunk_uuid);
+ uuid_unparse(chunk_uuid, cfg->chunk_uuid);
+
+ btrfs_set_super_bytenr(super, cfg->super_bytenr);
+ btrfs_set_super_num_devices(super, 1);
+ btrfs_set_super_magic(super, BTRFS_MAGIC_PARTIAL);
+ btrfs_set_super_generation(super, 1);
+ btrfs_set_super_root(super, root_bytenr);
+ btrfs_set_super_chunk_root(super, chunk_bytenr);
+ btrfs_set_super_total_bytes(super, cfg->num_bytes);
+ /*
+ * Temporary filesystem will only have 6 tree roots:
+ * chunk tree, root tree, extent_tree, device tree, fs tree
+ * and csum tree.
+ */
+ btrfs_set_super_bytes_used(super, 6 * cfg->nodesize);
+ btrfs_set_super_sectorsize(super, cfg->sectorsize);
+ btrfs_set_super_leafsize(super, cfg->nodesize);
+ btrfs_set_super_nodesize(super, cfg->nodesize);
+ btrfs_set_super_stripesize(super, cfg->stripesize);
+ btrfs_set_super_csum_type(super, BTRFS_CSUM_TYPE_CRC32);
+ btrfs_set_super_chunk_root(super, chunk_bytenr);
+ btrfs_set_super_cache_generation(super, -1);
+ btrfs_set_super_incompat_flags(super, cfg->features);
+ if (cfg->label)
+ __strncpy_null(super->label, cfg->label, BTRFS_LABEL_SIZE - 1);
+
+ /* Sys chunk array will be re-initialized at chunk tree init time */
+ super->sys_chunk_array_size = 0;
+
+ ret = write_temp_super(fd, super, cfg->super_bytenr);
+out:
+ return ret;
+}
- buf = malloc(sizeof(*buf) + max(sectorsize, leafsize));
+/*
+ * Setup an extent buffer for tree block.
+ */
+static int setup_temp_extent_buffer(struct extent_buffer *buf,
+ struct btrfs_mkfs_config *cfg,
+ u64 bytenr, u64 owner)
+{
+ unsigned char fsid[BTRFS_FSID_SIZE];
+ unsigned char chunk_uuid[BTRFS_UUID_SIZE];
+ int ret;
- /* create the tree of root objects */
- memset(buf->data, 0, leafsize);
- buf->len = leafsize;
- btrfs_set_header_bytenr(buf, blocks[1]);
- btrfs_set_header_nritems(buf, 4);
+ ret = uuid_parse(cfg->fs_uuid, fsid);
+ if (ret)
+ return -EINVAL;
+ ret = uuid_parse(cfg->chunk_uuid, chunk_uuid);
+ if (ret)
+ return -EINVAL;
+
+ memset(buf->data, 0, cfg->nodesize);
+ buf->len = cfg->nodesize;
+ btrfs_set_header_bytenr(buf, bytenr);
btrfs_set_header_generation(buf, 1);
btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
- btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
- write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
- BTRFS_FSID_SIZE);
-
- write_extent_buffer(buf, chunk_tree_uuid, (unsigned long)
- btrfs_header_chunk_tree_uuid(buf),
+ btrfs_set_header_owner(buf, owner);
+ btrfs_set_header_flags(buf, BTRFS_HEADER_FLAG_WRITTEN);
+ write_extent_buffer(buf, chunk_uuid, btrfs_header_chunk_tree_uuid(buf),
BTRFS_UUID_SIZE);
+ write_extent_buffer(buf, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
+ return 0;
+}
- /* create the items for the root tree */
+static inline int write_temp_extent_buffer(int fd, struct extent_buffer *buf,
+ u64 bytenr)
+{
+ int ret;
+
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+
+ /* Temporary extent buffer is always mapped 1:1 on disk */
+ ret = pwrite(fd, buf->data, buf->len, bytenr);
+ if (ret < buf->len)
+ ret = (ret < 0 ? ret : -EIO);
+ else
+ ret = 0;
+ return ret;
+}
+
+/*
+ * Insert a root item for temporary tree root
+ *
+ * Only used in make_btrfs_v2().
+ */
+static void insert_temp_root_item(struct extent_buffer *buf,
+ struct btrfs_mkfs_config *cfg,
+ int *slot, u32 *itemoff, u64 objectid,
+ u64 bytenr)
+{
+ struct btrfs_root_item root_item;
+ struct btrfs_inode_item *inode_item;
+ struct btrfs_disk_key disk_key;
+
+ btrfs_set_header_nritems(buf, *slot + 1);
+ (*itemoff) -= sizeof(root_item);
memset(&root_item, 0, sizeof(root_item));
inode_item = &root_item.inode;
btrfs_set_stack_inode_generation(inode_item, 1);
btrfs_set_stack_inode_size(inode_item, 3);
btrfs_set_stack_inode_nlink(inode_item, 1);
- btrfs_set_stack_inode_nbytes(inode_item, leafsize);
+ btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
btrfs_set_root_refs(&root_item, 1);
- btrfs_set_root_used(&root_item, leafsize);
+ btrfs_set_root_used(&root_item, cfg->nodesize);
btrfs_set_root_generation(&root_item, 1);
+ btrfs_set_root_bytenr(&root_item, bytenr);
memset(&disk_key, 0, sizeof(disk_key));
btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
+ btrfs_set_disk_key_objectid(&disk_key, objectid);
btrfs_set_disk_key_offset(&disk_key, 0);
- nritems = 0;
-
- itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, blocks[2]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
- nritems), sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, blocks[4]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, blocks[5]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
+ btrfs_set_item_key(buf, &disk_key, *slot);
+ btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(*slot), sizeof(root_item));
write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
+ btrfs_item_ptr_offset(buf, *slot),
sizeof(root_item));
- nritems++;
+ (*slot)++;
+}
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, blocks[6]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
+static int setup_temp_root_tree(int fd, struct btrfs_mkfs_config *cfg,
+ u64 root_bytenr, u64 extent_bytenr,
+ u64 dev_bytenr, u64 fs_bytenr, u64 csum_bytenr)
+{
+ struct extent_buffer *buf = NULL;
+ u32 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
+ int slot = 0;
+ int ret;
+ /*
+ * Provided bytenr must in ascending order, or tree root will have a
+ * bad key order.
+ */
+ if (!(root_bytenr < extent_bytenr && extent_bytenr < dev_bytenr &&
+ dev_bytenr < fs_bytenr && fs_bytenr < csum_bytenr)) {
+ error("bad tree bytenr order: "
+ "root < extent %llu < %llu, "
+ "extent < dev %llu < %llu, "
+ "dev < fs %llu < %llu, "
+ "fs < csum %llu < %llu",
+ (unsigned long long)root_bytenr,
+ (unsigned long long)extent_bytenr,
+ (unsigned long long)extent_bytenr,
+ (unsigned long long)dev_bytenr,
+ (unsigned long long)dev_bytenr,
+ (unsigned long long)fs_bytenr,
+ (unsigned long long)fs_bytenr,
+ (unsigned long long)csum_bytenr);
+ return -EINVAL;
+ }
+ buf = malloc(sizeof(*buf) + cfg->nodesize);
+ if (!buf)
+ return -ENOMEM;
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, leafsize, blocks[1]);
+ ret = setup_temp_extent_buffer(buf, cfg, root_bytenr,
+ BTRFS_ROOT_TREE_OBJECTID);
if (ret < 0)
- return -errno;
- else if (ret != leafsize)
- return -EIO;
+ goto out;
- /* create the items for the extent tree */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
- nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize);
- for (i = 1; i < 7; i++) {
- item_size = sizeof(struct btrfs_extent_item);
- if (!skinny_metadata)
- item_size += sizeof(struct btrfs_tree_block_info);
+ insert_temp_root_item(buf, cfg, &slot, &itemoff,
+ BTRFS_EXTENT_TREE_OBJECTID, extent_bytenr);
+ insert_temp_root_item(buf, cfg, &slot, &itemoff,
+ BTRFS_DEV_TREE_OBJECTID, dev_bytenr);
+ insert_temp_root_item(buf, cfg, &slot, &itemoff,
+ BTRFS_FS_TREE_OBJECTID, fs_bytenr);
+ insert_temp_root_item(buf, cfg, &slot, &itemoff,
+ BTRFS_CSUM_TREE_OBJECTID, csum_bytenr);
- BUG_ON(blocks[i] < first_free);
- BUG_ON(blocks[i] < blocks[i - 1]);
+ ret = write_temp_extent_buffer(fd, buf, root_bytenr);
+out:
+ free(buf);
+ return ret;
+}
- /* create extent item */
- itemoff -= item_size;
- btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
- if (skinny_metadata) {
- btrfs_set_disk_key_type(&disk_key,
- BTRFS_METADATA_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, 0);
- } else {
- btrfs_set_disk_key_type(&disk_key,
- BTRFS_EXTENT_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, leafsize);
- }
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
- itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- item_size);
- extent_item = btrfs_item_ptr(buf, nritems,
- struct btrfs_extent_item);
- btrfs_set_extent_refs(buf, extent_item, 1);
- btrfs_set_extent_generation(buf, extent_item, 1);
- btrfs_set_extent_flags(buf, extent_item,
- BTRFS_EXTENT_FLAG_TREE_BLOCK);
- nritems++;
+static int insert_temp_dev_item(int fd, struct extent_buffer *buf,
+ struct btrfs_mkfs_config *cfg,
+ int *slot, u32 *itemoff)
+{
+ struct btrfs_disk_key disk_key;
+ struct btrfs_dev_item *dev_item;
+ char super_buf[BTRFS_SUPER_INFO_SIZE];
+ unsigned char dev_uuid[BTRFS_UUID_SIZE];
+ unsigned char fsid[BTRFS_FSID_SIZE];
+ struct btrfs_super_block *super = (struct btrfs_super_block *)super_buf;
+ int ret;
- /* create extent ref */
- ref_root = reference_root_table[i];
- btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
- btrfs_set_disk_key_offset(&disk_key, ref_root);
- btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
- itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
- nritems++;
+ ret = pread(fd, super_buf, BTRFS_SUPER_INFO_SIZE, cfg->super_bytenr);
+ if (ret < BTRFS_SUPER_INFO_SIZE) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
}
- btrfs_set_header_bytenr(buf, blocks[2]);
- btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, leafsize, blocks[2]);
- if (ret < 0)
- return -errno;
- else if (ret != leafsize)
- return -EIO;
-
- /* create the chunk tree */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
- nritems = 0;
- item_size = sizeof(*dev_item);
- itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size;
- /* first device 1 (there is no device 0) */
+ btrfs_set_header_nritems(buf, *slot + 1);
+ (*itemoff) -= sizeof(*dev_item);
+ /* setup device item 1, 0 is for replace case */
+ btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
btrfs_set_disk_key_offset(&disk_key, 1);
- btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
-
- dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
+ btrfs_set_item_key(buf, &disk_key, *slot);
+ btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(*slot), sizeof(*dev_item));
+
+ dev_item = btrfs_item_ptr(buf, *slot, struct btrfs_dev_item);
+ /* Generate device uuid */
+ uuid_generate(dev_uuid);
+ write_extent_buffer(buf, dev_uuid,
+ (unsigned long)btrfs_device_uuid(dev_item),
+ BTRFS_UUID_SIZE);
+ uuid_parse(cfg->fs_uuid, fsid);
+ write_extent_buffer(buf, fsid,
+ (unsigned long)btrfs_device_fsid(dev_item),
+ BTRFS_FSID_SIZE);
btrfs_set_device_id(buf, dev_item, 1);
btrfs_set_device_generation(buf, dev_item, 0);
- btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
+ btrfs_set_device_total_bytes(buf, dev_item, cfg->num_bytes);
+ /*
+ * The number must match the initial SYSTEM and META chunk size
+ */
btrfs_set_device_bytes_used(buf, dev_item,
- BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- btrfs_set_device_io_align(buf, dev_item, sectorsize);
- btrfs_set_device_io_width(buf, dev_item, sectorsize);
- btrfs_set_device_sector_size(buf, dev_item, sectorsize);
+ BTRFS_MKFS_SYSTEM_GROUP_SIZE +
+ BTRFS_CONVERT_META_GROUP_SIZE);
+ btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
+ btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
+ btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
btrfs_set_device_type(buf, dev_item, 0);
- write_extent_buffer(buf, super.dev_item.uuid,
- (unsigned long)btrfs_device_uuid(dev_item),
- BTRFS_UUID_SIZE);
- write_extent_buffer(buf, super.fsid,
- (unsigned long)btrfs_device_fsid(dev_item),
- BTRFS_UUID_SIZE);
- read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
+ /* Super dev_item is not complete, copy the complete one to sb */
+ read_extent_buffer(buf, &super->dev_item, (unsigned long)dev_item,
sizeof(*dev_item));
+ ret = write_temp_super(fd, super, cfg->super_bytenr);
+ (*slot)++;
+out:
+ return ret;
+}
- nritems++;
- item_size = btrfs_chunk_item_size(1);
- itemoff = itemoff - item_size;
+static int insert_temp_chunk_item(int fd, struct extent_buffer *buf,
+ struct btrfs_mkfs_config *cfg,
+ int *slot, u32 *itemoff, u64 start, u64 len,
+ u64 type)
+{
+ struct btrfs_chunk *chunk;
+ struct btrfs_disk_key disk_key;
+ char super_buf[BTRFS_SUPER_INFO_SIZE];
+ struct btrfs_super_block *sb = (struct btrfs_super_block *)super_buf;
+ int ret = 0;
- /* then we have chunk 0 */
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- btrfs_set_disk_key_offset(&disk_key, 0);
- btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
+ ret = pread(fd, super_buf, BTRFS_SUPER_INFO_SIZE,
+ cfg->super_bytenr);
+ if (ret < BTRFS_SUPER_INFO_SIZE) {
+ ret = (ret < 0 ? ret : -EIO);
+ return ret;
+ }
- chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
- btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
+ btrfs_set_header_nritems(buf, *slot + 1);
+ (*itemoff) -= btrfs_chunk_item_size(1);
+ btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
+ btrfs_set_disk_key_offset(&disk_key, start);
+ btrfs_set_item_key(buf, &disk_key, *slot);
+ btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(*slot),
+ btrfs_chunk_item_size(1));
+
+ chunk = btrfs_item_ptr(buf, *slot, struct btrfs_chunk);
+ btrfs_set_chunk_length(buf, chunk, len);
btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
- btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
- btrfs_set_chunk_io_align(buf, chunk, sectorsize);
- btrfs_set_chunk_io_width(buf, chunk, sectorsize);
- btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
+ btrfs_set_chunk_type(buf, chunk, type);
+ btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
+ btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
+ btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
btrfs_set_chunk_num_stripes(buf, chunk, 1);
+ /* TODO: Support DUP profile for system chunk */
btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
- btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
- nritems++;
-
- write_extent_buffer(buf, super.dev_item.uuid,
- (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
+ /* We are doing 1:1 mapping, so start is its dev offset */
+ btrfs_set_stripe_offset_nr(buf, chunk, 0, start);
+ write_extent_buffer(buf, &sb->dev_item.uuid,
+ (unsigned long)btrfs_stripe_dev_uuid_nr(chunk, 0),
BTRFS_UUID_SIZE);
+ (*slot)++;
- /* copy the key for the chunk to the system array */
- ptr = super.sys_chunk_array;
- array_size = sizeof(disk_key);
-
- memcpy(ptr, &disk_key, sizeof(disk_key));
- ptr += sizeof(disk_key);
-
- /* copy the chunk to the system array */
- read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
- array_size += item_size;
- ptr += item_size;
- btrfs_set_super_sys_array_size(&super, array_size);
-
- btrfs_set_header_bytenr(buf, blocks[3]);
- btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, leafsize, blocks[3]);
- if (ret < 0)
- return -errno;
- else if (ret != leafsize)
- return -EIO;
-
- /* create the device tree */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
- nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
- sizeof(struct btrfs_dev_extent);
-
- btrfs_set_disk_key_objectid(&disk_key, 1);
- btrfs_set_disk_key_offset(&disk_key, 0);
- btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(struct btrfs_dev_extent));
- dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
- btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
- BTRFS_CHUNK_TREE_OBJECTID);
- btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
- BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
-
- write_extent_buffer(buf, chunk_tree_uuid,
- (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
- BTRFS_UUID_SIZE);
+ /*
+ * If it's system chunk, also copy it to super block.
+ */
+ if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
+ char *cur;
+
+ cur = (char *)sb->sys_chunk_array + sb->sys_chunk_array_size;
+ memcpy(cur, &disk_key, sizeof(disk_key));
+ cur += sizeof(disk_key);
+ read_extent_buffer(buf, cur, (unsigned long int)chunk,
+ btrfs_chunk_item_size(1));
+ sb->sys_chunk_array_size += btrfs_chunk_item_size(1) +
+ sizeof(disk_key);
+
+ ret = write_temp_super(fd, sb, cfg->super_bytenr);
+ }
+ return ret;
+}
- btrfs_set_dev_extent_length(buf, dev_extent,
- BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- nritems++;
+static int setup_temp_chunk_tree(int fd, struct btrfs_mkfs_config *cfg,
+ u64 sys_chunk_start, u64 meta_chunk_start,
+ u64 chunk_bytenr)
+{
+ struct extent_buffer *buf = NULL;
+ u32 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
+ int slot = 0;
+ int ret;
- btrfs_set_header_bytenr(buf, blocks[4]);
- btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, leafsize, blocks[4]);
+ /* Must ensure SYS chunk starts before META chunk */
+ if (meta_chunk_start < sys_chunk_start) {
+ error("wrong chunk order: meta < system %llu < %llu",
+ (unsigned long long)meta_chunk_start,
+ (unsigned long long)sys_chunk_start);
+ return -EINVAL;
+ }
+ buf = malloc(sizeof(*buf) + cfg->nodesize);
+ if (!buf)
+ return -ENOMEM;
+ ret = setup_temp_extent_buffer(buf, cfg, chunk_bytenr,
+ BTRFS_CHUNK_TREE_OBJECTID);
if (ret < 0)
- return -errno;
- else if (ret != leafsize)
- return -EIO;
+ goto out;
- /* create the FS root */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(buf, blocks[5]);
- btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, 0);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, leafsize, blocks[5]);
+ ret = insert_temp_dev_item(fd, buf, cfg, &slot, &itemoff);
if (ret < 0)
- return -errno;
- else if (ret != leafsize)
- return -EIO;
-
- /* finally create the csum root */
- memset(buf->data+sizeof(struct btrfs_header), 0,
- leafsize-sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(buf, blocks[6]);
- btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, 0);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, leafsize, blocks[6]);
+ goto out;
+ ret = insert_temp_chunk_item(fd, buf, cfg, &slot, &itemoff,
+ sys_chunk_start,
+ BTRFS_MKFS_SYSTEM_GROUP_SIZE,
+ BTRFS_BLOCK_GROUP_SYSTEM);
if (ret < 0)
- return -errno;
- else if (ret != leafsize)
- return -EIO;
-
- /* and write out the super block */
- BUG_ON(sizeof(super) > sectorsize);
- memset(buf->data, 0, sectorsize);
- memcpy(buf->data, &super, sizeof(super));
- buf->len = sectorsize;
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, sectorsize, blocks[0]);
+ goto out;
+ ret = insert_temp_chunk_item(fd, buf, cfg, &slot, &itemoff,
+ meta_chunk_start,
+ BTRFS_CONVERT_META_GROUP_SIZE,
+ BTRFS_BLOCK_GROUP_METADATA);
if (ret < 0)
- return -errno;
- else if (ret != sectorsize)
- return -EIO;
+ goto out;
+ ret = write_temp_extent_buffer(fd, buf, chunk_bytenr);
+out:
free(buf);
- return 0;
+ return ret;
}
-u64 btrfs_device_size(int fd, struct stat *st)
+static void insert_temp_dev_extent(struct extent_buffer *buf,
+ int *slot, u32 *itemoff, u64 start, u64 len)
{
- u64 size;
- if (S_ISREG(st->st_mode)) {
- return st->st_size;
- }
- if (!S_ISBLK(st->st_mode)) {
- return 0;
- }
- if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
- return size;
- }
- return 0;
+ struct btrfs_dev_extent *dev_extent;
+ struct btrfs_disk_key disk_key;
+
+ btrfs_set_header_nritems(buf, *slot + 1);
+ (*itemoff) -= sizeof(*dev_extent);
+ btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
+ btrfs_set_disk_key_objectid(&disk_key, 1);
+ btrfs_set_disk_key_offset(&disk_key, start);
+ btrfs_set_item_key(buf, &disk_key, *slot);
+ btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(*slot), sizeof(*dev_extent));
+
+ dev_extent = btrfs_item_ptr(buf, *slot, struct btrfs_dev_extent);
+ btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID);
+ btrfs_set_dev_extent_length(buf, dev_extent, len);
+ btrfs_set_dev_extent_chunk_offset(buf, dev_extent, start);
+ btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
+ BTRFS_CHUNK_TREE_OBJECTID);
+ (*slot)++;
}
-static int zero_blocks(int fd, off_t start, size_t len)
+static int setup_temp_dev_tree(int fd, struct btrfs_mkfs_config *cfg,
+ u64 sys_chunk_start, u64 meta_chunk_start,
+ u64 dev_bytenr)
{
- char *buf = malloc(len);
- int ret = 0;
- ssize_t written;
+ struct extent_buffer *buf = NULL;
+ u32 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
+ int slot = 0;
+ int ret;
+ /* Must ensure SYS chunk starts before META chunk */
+ if (meta_chunk_start < sys_chunk_start) {
+ error("wrong chunk order: meta < system %llu < %llu",
+ (unsigned long long)meta_chunk_start,
+ (unsigned long long)sys_chunk_start);
+ return -EINVAL;
+ }
+ buf = malloc(sizeof(*buf) + cfg->nodesize);
if (!buf)
return -ENOMEM;
- memset(buf, 0, len);
- written = pwrite(fd, buf, len, start);
- if (written != len)
- ret = -EIO;
+ ret = setup_temp_extent_buffer(buf, cfg, dev_bytenr,
+ BTRFS_DEV_TREE_OBJECTID);
+ if (ret < 0)
+ goto out;
+ insert_temp_dev_extent(buf, &slot, &itemoff, sys_chunk_start,
+ BTRFS_MKFS_SYSTEM_GROUP_SIZE);
+ insert_temp_dev_extent(buf, &slot, &itemoff, meta_chunk_start,
+ BTRFS_CONVERT_META_GROUP_SIZE);
+ ret = write_temp_extent_buffer(fd, buf, dev_bytenr);
+out:
free(buf);
return ret;
}
-static int zero_dev_start(int fd)
+static int setup_temp_fs_tree(int fd, struct btrfs_mkfs_config *cfg,
+ u64 fs_bytenr)
{
- off_t start = 0;
- size_t len = 2 * 1024 * 1024;
+ struct extent_buffer *buf = NULL;
+ int ret;
-#ifdef __sparc__
- /* don't overwrite the disk labels on sparc */
- start = 1024;
- len -= 1024;
-#endif
- return zero_blocks(fd, start, len);
+ buf = malloc(sizeof(*buf) + cfg->nodesize);
+ if (!buf)
+ return -ENOMEM;
+ ret = setup_temp_extent_buffer(buf, cfg, fs_bytenr,
+ BTRFS_FS_TREE_OBJECTID);
+ if (ret < 0)
+ goto out;
+ /*
+ * Temporary fs tree is completely empty.
+ */
+ ret = write_temp_extent_buffer(fd, buf, fs_bytenr);
+out:
+ free(buf);
+ return ret;
}
-static int zero_dev_end(int fd, u64 dev_size)
+static int setup_temp_csum_tree(int fd, struct btrfs_mkfs_config *cfg,
+ u64 csum_bytenr)
{
- size_t len = 2 * 1024 * 1024;
- off_t start = dev_size - len;
+ struct extent_buffer *buf = NULL;
+ int ret;
- return zero_blocks(fd, start, len);
+ buf = malloc(sizeof(*buf) + cfg->nodesize);
+ if (!buf)
+ return -ENOMEM;
+ ret = setup_temp_extent_buffer(buf, cfg, csum_bytenr,
+ BTRFS_CSUM_TREE_OBJECTID);
+ if (ret < 0)
+ goto out;
+ /*
+ * Temporary csum tree is completely empty.
+ */
+ ret = write_temp_extent_buffer(fd, buf, csum_bytenr);
+out:
+ free(buf);
+ return ret;
}
-int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, int fd, char *path,
- u64 block_count, u32 io_width, u32 io_align,
- u32 sectorsize)
+/*
+ * Insert one temporary extent item.
+ *
+ * NOTE: if skinny_metadata is not enabled, this function must be called
+ * after all other trees are initialized.
+ * Or fs without skinny-metadata will be screwed up.
+ */
+static int insert_temp_extent_item(int fd, struct extent_buffer *buf,
+ struct btrfs_mkfs_config *cfg,
+ int *slot, u32 *itemoff, u64 bytenr,
+ u64 ref_root)
{
- struct btrfs_super_block *disk_super;
- struct btrfs_super_block *super = root->fs_info->super_copy;
- struct btrfs_device *device;
- struct btrfs_dev_item *dev_item;
- char *buf;
- u64 total_bytes;
- u64 num_devs;
+ struct extent_buffer *tmp;
+ struct btrfs_extent_item *ei;
+ struct btrfs_extent_inline_ref *iref;
+ struct btrfs_disk_key disk_key;
+ struct btrfs_disk_key tree_info_key;
+ struct btrfs_tree_block_info *info;
+ int itemsize;
+ int skinny_metadata = cfg->features &
+ BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA;
int ret;
- device = kzalloc(sizeof(*device), GFP_NOFS);
- if (!device)
- return -ENOMEM;
- buf = kmalloc(sectorsize, GFP_NOFS);
- if (!buf) {
- kfree(device);
- return -ENOMEM;
- }
- BUG_ON(sizeof(*disk_super) > sectorsize);
- memset(buf, 0, sectorsize);
+ if (skinny_metadata)
+ itemsize = sizeof(*ei) + sizeof(*iref);
+ else
+ itemsize = sizeof(*ei) + sizeof(*iref) +
+ sizeof(struct btrfs_tree_block_info);
- disk_super = (struct btrfs_super_block *)buf;
- dev_item = &disk_super->dev_item;
+ btrfs_set_header_nritems(buf, *slot + 1);
+ *(itemoff) -= itemsize;
- uuid_generate(device->uuid);
- device->devid = 0;
- device->type = 0;
- device->io_width = io_width;
- device->io_align = io_align;
- device->sector_size = sectorsize;
- device->fd = fd;
- device->writeable = 1;
- device->total_bytes = block_count;
- device->bytes_used = 0;
- device->total_ios = 0;
- device->dev_root = root->fs_info->dev_root;
+ if (skinny_metadata) {
+ btrfs_set_disk_key_type(&disk_key, BTRFS_METADATA_ITEM_KEY);
+ btrfs_set_disk_key_offset(&disk_key, 0);
+ } else {
+ btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
+ btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
+ }
+ btrfs_set_disk_key_objectid(&disk_key, bytenr);
- ret = btrfs_add_device(trans, root, device);
- BUG_ON(ret);
+ btrfs_set_item_key(buf, &disk_key, *slot);
+ btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(*slot), itemsize);
- total_bytes = btrfs_super_total_bytes(super) + block_count;
- btrfs_set_super_total_bytes(super, total_bytes);
+ ei = btrfs_item_ptr(buf, *slot, struct btrfs_extent_item);
+ btrfs_set_extent_refs(buf, ei, 1);
+ btrfs_set_extent_generation(buf, ei, 1);
+ btrfs_set_extent_flags(buf, ei, BTRFS_EXTENT_FLAG_TREE_BLOCK);
- num_devs = btrfs_super_num_devices(super) + 1;
- btrfs_set_super_num_devices(super, num_devs);
+ if (skinny_metadata) {
+ iref = (struct btrfs_extent_inline_ref *)(ei + 1);
+ } else {
+ info = (struct btrfs_tree_block_info *)(ei + 1);
+ iref = (struct btrfs_extent_inline_ref *)(info + 1);
+ }
+ btrfs_set_extent_inline_ref_type(buf, iref,
+ BTRFS_TREE_BLOCK_REF_KEY);
+ btrfs_set_extent_inline_ref_offset(buf, iref, ref_root);
- memcpy(disk_super, super, sizeof(*disk_super));
+ (*slot)++;
+ if (skinny_metadata)
+ return 0;
- printf("adding device %s id %llu\n", path,
- (unsigned long long)device->devid);
+ /*
+ * Lastly, check the tree block key by read the tree block
+ * Since we do 1:1 mapping for convert case, we can directly
+ * read the bytenr from disk
+ */
+ tmp = malloc(sizeof(*tmp) + cfg->nodesize);
+ if (!tmp)
+ return -ENOMEM;
+ ret = setup_temp_extent_buffer(tmp, cfg, bytenr, ref_root);
+ if (ret < 0)
+ goto out;
+ ret = pread(fd, tmp->data, cfg->nodesize, bytenr);
+ if (ret < cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+ if (btrfs_header_nritems(tmp) == 0) {
+ btrfs_set_disk_key_type(&tree_info_key, 0);
+ btrfs_set_disk_key_objectid(&tree_info_key, 0);
+ btrfs_set_disk_key_offset(&tree_info_key, 0);
+ } else {
+ btrfs_item_key(tmp, &tree_info_key, 0);
+ }
+ btrfs_set_tree_block_key(buf, info, &tree_info_key);
- btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
- btrfs_set_stack_device_id(dev_item, device->devid);
- btrfs_set_stack_device_type(dev_item, device->type);
- btrfs_set_stack_device_io_align(dev_item, device->io_align);
- btrfs_set_stack_device_io_width(dev_item, device->io_width);
- btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
- btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
- btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
- memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
+out:
+ free(tmp);
+ return ret;
+}
- ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
- BUG_ON(ret != sectorsize);
+static void insert_temp_block_group(struct extent_buffer *buf,
+ struct btrfs_mkfs_config *cfg,
+ int *slot, u32 *itemoff,
+ u64 bytenr, u64 len, u64 used, u64 flag)
+{
+ struct btrfs_block_group_item bgi;
+ struct btrfs_disk_key disk_key;
+
+ btrfs_set_header_nritems(buf, *slot + 1);
+ (*itemoff) -= sizeof(bgi);
+ btrfs_set_disk_key_type(&disk_key, BTRFS_BLOCK_GROUP_ITEM_KEY);
+ btrfs_set_disk_key_objectid(&disk_key, bytenr);
+ btrfs_set_disk_key_offset(&disk_key, len);
+ btrfs_set_item_key(buf, &disk_key, *slot);
+ btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(*slot), sizeof(bgi));
+
+ btrfs_set_block_group_flags(&bgi, flag);
+ btrfs_set_block_group_used(&bgi, used);
+ btrfs_set_block_group_chunk_objectid(&bgi,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID);
+ write_extent_buffer(buf, &bgi, btrfs_item_ptr_offset(buf, *slot),
+ sizeof(bgi));
+ (*slot)++;
+}
+
+static int setup_temp_extent_tree(int fd, struct btrfs_mkfs_config *cfg,
+ u64 chunk_bytenr, u64 root_bytenr,
+ u64 extent_bytenr, u64 dev_bytenr,
+ u64 fs_bytenr, u64 csum_bytenr)
+{
+ struct extent_buffer *buf = NULL;
+ u32 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
+ int slot = 0;
+ int ret;
+
+ /*
+ * We must ensure provided bytenr are in ascending order,
+ * or extent tree key order will be broken.
+ */
+ if (!(chunk_bytenr < root_bytenr && root_bytenr < extent_bytenr &&
+ extent_bytenr < dev_bytenr && dev_bytenr < fs_bytenr &&
+ fs_bytenr < csum_bytenr)) {
+ error("bad tree bytenr order: "
+ "chunk < root %llu < %llu, "
+ "root < extent %llu < %llu, "
+ "extent < dev %llu < %llu, "
+ "dev < fs %llu < %llu, "
+ "fs < csum %llu < %llu",
+ (unsigned long long)chunk_bytenr,
+ (unsigned long long)root_bytenr,
+ (unsigned long long)root_bytenr,
+ (unsigned long long)extent_bytenr,
+ (unsigned long long)extent_bytenr,
+ (unsigned long long)dev_bytenr,
+ (unsigned long long)dev_bytenr,
+ (unsigned long long)fs_bytenr,
+ (unsigned long long)fs_bytenr,
+ (unsigned long long)csum_bytenr);
+ return -EINVAL;
+ }
+ buf = malloc(sizeof(*buf) + cfg->nodesize);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = setup_temp_extent_buffer(buf, cfg, extent_bytenr,
+ BTRFS_EXTENT_TREE_OBJECTID);
+ if (ret < 0)
+ goto out;
+
+ ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
+ chunk_bytenr, BTRFS_CHUNK_TREE_OBJECTID);
+ if (ret < 0)
+ goto out;
+
+ insert_temp_block_group(buf, cfg, &slot, &itemoff, chunk_bytenr,
+ BTRFS_MKFS_SYSTEM_GROUP_SIZE, cfg->nodesize,
+ BTRFS_BLOCK_GROUP_SYSTEM);
+
+ ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
+ root_bytenr, BTRFS_ROOT_TREE_OBJECTID);
+ if (ret < 0)
+ goto out;
+
+ /* 5 tree block used, root, extent, dev, fs and csum*/
+ insert_temp_block_group(buf, cfg, &slot, &itemoff, root_bytenr,
+ BTRFS_CONVERT_META_GROUP_SIZE, cfg->nodesize * 5,
+ BTRFS_BLOCK_GROUP_METADATA);
+
+ ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
+ extent_bytenr, BTRFS_EXTENT_TREE_OBJECTID);
+ if (ret < 0)
+ goto out;
+ ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
+ dev_bytenr, BTRFS_DEV_TREE_OBJECTID);
+ if (ret < 0)
+ goto out;
+ ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
+ fs_bytenr, BTRFS_FS_TREE_OBJECTID);
+ if (ret < 0)
+ goto out;
+ ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
+ csum_bytenr, BTRFS_CSUM_TREE_OBJECTID);
+ if (ret < 0)
+ goto out;
+
+ ret = write_temp_extent_buffer(fd, buf, extent_bytenr);
+out:
+ free(buf);
+ return ret;
+}
+
+/*
+ * Improved version of make_btrfs().
+ *
+ * This one will
+ * 1) Do chunk allocation to avoid used data
+ * And after this function, extent type matches chunk type
+ * 2) Better structured code
+ * No super long hand written codes to initialized all tree blocks
+ * Split into small blocks and reuse codes.
+ * TODO: Reuse tree operation facilities by introducing new flags
+ */
+static int make_convert_btrfs(int fd, struct btrfs_mkfs_config *cfg,
+ struct btrfs_convert_context *cctx)
+{
+ struct cache_tree *free = &cctx->free;
+ struct cache_tree *used = &cctx->used;
+ u64 sys_chunk_start;
+ u64 meta_chunk_start;
+ /* chunk tree bytenr, in system chunk */
+ u64 chunk_bytenr;
+ /* metadata trees bytenr, in metadata chunk */
+ u64 root_bytenr;
+ u64 extent_bytenr;
+ u64 dev_bytenr;
+ u64 fs_bytenr;
+ u64 csum_bytenr;
+ int ret;
+
+ /* Shouldn't happen */
+ BUG_ON(cache_tree_empty(used));
+
+ /*
+ * reserve space for temporary superblock first
+ * Here we allocate a little larger space, to keep later
+ * free space will be STRIPE_LEN aligned
+ */
+ ret = reserve_free_space(free, BTRFS_STRIPE_LEN,
+ &cfg->super_bytenr);
+ if (ret < 0)
+ goto out;
+
+ /*
+ * Then reserve system chunk space
+ * TODO: Change system group size depending on cctx->total_bytes.
+ * If using current 4M, it can only handle less than one TB for
+ * worst case and then run out of sys space.
+ */
+ ret = reserve_free_space(free, BTRFS_MKFS_SYSTEM_GROUP_SIZE,
+ &sys_chunk_start);
+ if (ret < 0)
+ goto out;
+ ret = reserve_free_space(free, BTRFS_CONVERT_META_GROUP_SIZE,
+ &meta_chunk_start);
+ if (ret < 0)
+ goto out;
+
+ /*
+ * Allocated meta/sys chunks will be mapped 1:1 with device offset.
+ *
+ * Inside the allocated metadata chunk, the layout will be:
+ * | offset | contents |
+ * -------------------------------------
+ * | +0 | tree root |
+ * | +nodesize | extent root |
+ * | +nodesize * 2 | device root |
+ * | +nodesize * 3 | fs tree |
+ * | +nodesize * 4 | csum tree |
+ * -------------------------------------
+ * Inside the allocated system chunk, the layout will be:
+ * | offset | contents |
+ * -------------------------------------
+ * | +0 | chunk root |
+ * -------------------------------------
+ */
+ chunk_bytenr = sys_chunk_start;
+ root_bytenr = meta_chunk_start;
+ extent_bytenr = meta_chunk_start + cfg->nodesize;
+ dev_bytenr = meta_chunk_start + cfg->nodesize * 2;
+ fs_bytenr = meta_chunk_start + cfg->nodesize * 3;
+ csum_bytenr = meta_chunk_start + cfg->nodesize * 4;
+
+ ret = setup_temp_super(fd, cfg, root_bytenr, chunk_bytenr);
+ if (ret < 0)
+ goto out;
+
+ ret = setup_temp_root_tree(fd, cfg, root_bytenr, extent_bytenr,
+ dev_bytenr, fs_bytenr, csum_bytenr);
+ if (ret < 0)
+ goto out;
+ ret = setup_temp_chunk_tree(fd, cfg, sys_chunk_start, meta_chunk_start,
+ chunk_bytenr);
+ if (ret < 0)
+ goto out;
+ ret = setup_temp_dev_tree(fd, cfg, sys_chunk_start, meta_chunk_start,
+ dev_bytenr);
+ if (ret < 0)
+ goto out;
+ ret = setup_temp_fs_tree(fd, cfg, fs_bytenr);
+ if (ret < 0)
+ goto out;
+ ret = setup_temp_csum_tree(fd, cfg, csum_bytenr);
+ if (ret < 0)
+ goto out;
+ /*
+ * Setup extent tree last, since it may need to read tree block key
+ * for non-skinny metadata case.
+ */
+ ret = setup_temp_extent_tree(fd, cfg, chunk_bytenr, root_bytenr,
+ extent_bytenr, dev_bytenr, fs_bytenr,
+ csum_bytenr);
+out:
+ return ret;
+}
+
+/*
+ * @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
+ *
+ * The superblock signature is not valid, denotes a partially created
+ * filesystem, needs to be finalized.
+ */
+int make_btrfs(int fd, struct btrfs_mkfs_config *cfg,
+ struct btrfs_convert_context *cctx)
+{
+ struct btrfs_super_block super;
+ struct extent_buffer *buf;
+ struct btrfs_root_item root_item;
+ struct btrfs_disk_key disk_key;
+ struct btrfs_extent_item *extent_item;
+ struct btrfs_inode_item *inode_item;
+ struct btrfs_chunk *chunk;
+ struct btrfs_dev_item *dev_item;
+ struct btrfs_dev_extent *dev_extent;
+ u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+ u8 *ptr;
+ int i;
+ int ret;
+ u32 itemoff;
+ u32 nritems = 0;
+ u64 first_free;
+ u64 ref_root;
+ u32 array_size;
+ u32 item_size;
+ int skinny_metadata = !!(cfg->features &
+ BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
+ u64 num_bytes;
+
+ if (cctx)
+ return make_convert_btrfs(fd, cfg, cctx);
+ buf = malloc(sizeof(*buf) + max(cfg->sectorsize, cfg->nodesize));
+ if (!buf)
+ return -ENOMEM;
+
+ first_free = BTRFS_SUPER_INFO_OFFSET + cfg->sectorsize * 2 - 1;
+ first_free &= ~((u64)cfg->sectorsize - 1);
+
+ memset(&super, 0, sizeof(super));
+
+ num_bytes = (cfg->num_bytes / cfg->sectorsize) * cfg->sectorsize;
+ if (*cfg->fs_uuid) {
+ if (uuid_parse(cfg->fs_uuid, super.fsid) != 0) {
+ error("cannot not parse UUID: %s", cfg->fs_uuid);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (!test_uuid_unique(cfg->fs_uuid)) {
+ error("non-unique UUID: %s", cfg->fs_uuid);
+ ret = -EBUSY;
+ goto out;
+ }
+ } else {
+ uuid_generate(super.fsid);
+ uuid_unparse(super.fsid, cfg->fs_uuid);
+ }
+ uuid_generate(super.dev_item.uuid);
+ uuid_generate(chunk_tree_uuid);
+
+ btrfs_set_super_bytenr(&super, cfg->blocks[0]);
+ btrfs_set_super_num_devices(&super, 1);
+ btrfs_set_super_magic(&super, BTRFS_MAGIC_PARTIAL);
+ btrfs_set_super_generation(&super, 1);
+ btrfs_set_super_root(&super, cfg->blocks[1]);
+ btrfs_set_super_chunk_root(&super, cfg->blocks[3]);
+ btrfs_set_super_total_bytes(&super, num_bytes);
+ btrfs_set_super_bytes_used(&super, 6 * cfg->nodesize);
+ btrfs_set_super_sectorsize(&super, cfg->sectorsize);
+ btrfs_set_super_leafsize(&super, cfg->nodesize);
+ btrfs_set_super_nodesize(&super, cfg->nodesize);
+ btrfs_set_super_stripesize(&super, cfg->stripesize);
+ btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
+ btrfs_set_super_chunk_root_generation(&super, 1);
+ btrfs_set_super_cache_generation(&super, -1);
+ btrfs_set_super_incompat_flags(&super, cfg->features);
+ if (cfg->label)
+ __strncpy_null(super.label, cfg->label, BTRFS_LABEL_SIZE - 1);
+
+ /* create the tree of root objects */
+ memset(buf->data, 0, cfg->nodesize);
+ buf->len = cfg->nodesize;
+ btrfs_set_header_bytenr(buf, cfg->blocks[1]);
+ btrfs_set_header_nritems(buf, 4);
+ btrfs_set_header_generation(buf, 1);
+ btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
+ btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
+ write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
+ BTRFS_FSID_SIZE);
+
+ write_extent_buffer(buf, chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(buf),
+ BTRFS_UUID_SIZE);
+
+ /* create the items for the root tree */
+ memset(&root_item, 0, sizeof(root_item));
+ inode_item = &root_item.inode;
+ btrfs_set_stack_inode_generation(inode_item, 1);
+ btrfs_set_stack_inode_size(inode_item, 3);
+ btrfs_set_stack_inode_nlink(inode_item, 1);
+ btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
+ btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
+ btrfs_set_root_refs(&root_item, 1);
+ btrfs_set_root_used(&root_item, cfg->nodesize);
+ btrfs_set_root_generation(&root_item, 1);
+
+ memset(&disk_key, 0, sizeof(disk_key));
+ btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
+ btrfs_set_disk_key_offset(&disk_key, 0);
+ nritems = 0;
+
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[2]);
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems),
+ sizeof(root_item));
+ write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
+ nritems), sizeof(root_item));
+ nritems++;
+
+ itemoff = itemoff - sizeof(root_item);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[4]);
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems),
+ sizeof(root_item));
+ write_extent_buffer(buf, &root_item,
+ btrfs_item_ptr_offset(buf, nritems),
+ sizeof(root_item));
+ nritems++;
+
+ itemoff = itemoff - sizeof(root_item);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[5]);
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems),
+ sizeof(root_item));
+ write_extent_buffer(buf, &root_item,
+ btrfs_item_ptr_offset(buf, nritems),
+ sizeof(root_item));
+ nritems++;
+
+ itemoff = itemoff - sizeof(root_item);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[6]);
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems),
+ sizeof(root_item));
+ write_extent_buffer(buf, &root_item,
+ btrfs_item_ptr_offset(buf, nritems),
+ sizeof(root_item));
+ nritems++;
+
+
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[1]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ /* create the items for the extent tree */
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ cfg->nodesize - sizeof(struct btrfs_header));
+ nritems = 0;
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
+ for (i = 1; i < 7; i++) {
+ item_size = sizeof(struct btrfs_extent_item);
+ if (!skinny_metadata)
+ item_size += sizeof(struct btrfs_tree_block_info);
+
+ if (cfg->blocks[i] < first_free) {
+ error("block[%d] below first free: %llu < %llu",
+ i, (unsigned long long)cfg->blocks[i],
+ (unsigned long long)first_free);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (cfg->blocks[i] < cfg->blocks[i - 1]) {
+ error("blocks %d and %d in reverse order: %llu < %llu",
+ i, i - 1,
+ (unsigned long long)cfg->blocks[i],
+ (unsigned long long)cfg->blocks[i - 1]);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* create extent item */
+ itemoff -= item_size;
+ btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
+ if (skinny_metadata) {
+ btrfs_set_disk_key_type(&disk_key,
+ BTRFS_METADATA_ITEM_KEY);
+ btrfs_set_disk_key_offset(&disk_key, 0);
+ } else {
+ btrfs_set_disk_key_type(&disk_key,
+ BTRFS_EXTENT_ITEM_KEY);
+ btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
+ }
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
+ itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems),
+ item_size);
+ extent_item = btrfs_item_ptr(buf, nritems,
+ struct btrfs_extent_item);
+ btrfs_set_extent_refs(buf, extent_item, 1);
+ btrfs_set_extent_generation(buf, extent_item, 1);
+ btrfs_set_extent_flags(buf, extent_item,
+ BTRFS_EXTENT_FLAG_TREE_BLOCK);
+ nritems++;
+
+ /* create extent ref */
+ ref_root = reference_root_table[i];
+ btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
+ btrfs_set_disk_key_offset(&disk_key, ref_root);
+ btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
+ itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
+ nritems++;
+ }
+ btrfs_set_header_bytenr(buf, cfg->blocks[2]);
+ btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
+ btrfs_set_header_nritems(buf, nritems);
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[2]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ /* create the chunk tree */
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ cfg->nodesize - sizeof(struct btrfs_header));
+ nritems = 0;
+ item_size = sizeof(*dev_item);
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - item_size;
+
+ /* first device 1 (there is no device 0) */
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
+ btrfs_set_disk_key_offset(&disk_key, 1);
+ btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
+
+ dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
+ btrfs_set_device_id(buf, dev_item, 1);
+ btrfs_set_device_generation(buf, dev_item, 0);
+ btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
+ btrfs_set_device_bytes_used(buf, dev_item,
+ BTRFS_MKFS_SYSTEM_GROUP_SIZE);
+ btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
+ btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
+ btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
+ btrfs_set_device_type(buf, dev_item, 0);
+
+ write_extent_buffer(buf, super.dev_item.uuid,
+ (unsigned long)btrfs_device_uuid(dev_item),
+ BTRFS_UUID_SIZE);
+ write_extent_buffer(buf, super.fsid,
+ (unsigned long)btrfs_device_fsid(dev_item),
+ BTRFS_UUID_SIZE);
+ read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
+ sizeof(*dev_item));
+
+ nritems++;
+ item_size = btrfs_chunk_item_size(1);
+ itemoff = itemoff - item_size;
+
+ /* then we have chunk 0 */
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
+ btrfs_set_disk_key_offset(&disk_key, 0);
+ btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
+
+ chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
+ btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
+ btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
+ btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
+ btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
+ btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
+ btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
+ btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
+ btrfs_set_chunk_num_stripes(buf, chunk, 1);
+ btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
+ btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
+ nritems++;
+
+ write_extent_buffer(buf, super.dev_item.uuid,
+ (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
+ BTRFS_UUID_SIZE);
+
+ /* copy the key for the chunk to the system array */
+ ptr = super.sys_chunk_array;
+ array_size = sizeof(disk_key);
+
+ memcpy(ptr, &disk_key, sizeof(disk_key));
+ ptr += sizeof(disk_key);
+
+ /* copy the chunk to the system array */
+ read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
+ array_size += item_size;
+ ptr += item_size;
+ btrfs_set_super_sys_array_size(&super, array_size);
+
+ btrfs_set_header_bytenr(buf, cfg->blocks[3]);
+ btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
+ btrfs_set_header_nritems(buf, nritems);
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[3]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ /* create the device tree */
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ cfg->nodesize - sizeof(struct btrfs_header));
+ nritems = 0;
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) -
+ sizeof(struct btrfs_dev_extent);
+
+ btrfs_set_disk_key_objectid(&disk_key, 1);
+ btrfs_set_disk_key_offset(&disk_key, 0);
+ btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems),
+ sizeof(struct btrfs_dev_extent));
+ dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
+ btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
+ BTRFS_CHUNK_TREE_OBJECTID);
+ btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID);
+ btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
+
+ write_extent_buffer(buf, chunk_tree_uuid,
+ (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
+ BTRFS_UUID_SIZE);
+
+ btrfs_set_dev_extent_length(buf, dev_extent,
+ BTRFS_MKFS_SYSTEM_GROUP_SIZE);
+ nritems++;
+
+ btrfs_set_header_bytenr(buf, cfg->blocks[4]);
+ btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
+ btrfs_set_header_nritems(buf, nritems);
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[4]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ /* create the FS root */
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ cfg->nodesize - sizeof(struct btrfs_header));
+ btrfs_set_header_bytenr(buf, cfg->blocks[5]);
+ btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
+ btrfs_set_header_nritems(buf, 0);
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[5]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+ /* finally create the csum root */
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ cfg->nodesize - sizeof(struct btrfs_header));
+ btrfs_set_header_bytenr(buf, cfg->blocks[6]);
+ btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
+ btrfs_set_header_nritems(buf, 0);
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[6]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ /* and write out the super block */
+ memset(buf->data, 0, BTRFS_SUPER_INFO_SIZE);
+ memcpy(buf->data, &super, sizeof(super));
+ buf->len = BTRFS_SUPER_INFO_SIZE;
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, cfg->blocks[0]);
+ if (ret != BTRFS_SUPER_INFO_SIZE) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ ret = 0;
+
+out:
+ free(buf);
+ return ret;
+}
+
+#define VERSION_TO_STRING3(a,b,c) #a "." #b "." #c, KERNEL_VERSION(a,b,c)
+#define VERSION_TO_STRING2(a,b) #a "." #b, KERNEL_VERSION(a,b,0)
+
+/*
+ * Feature stability status and versions: compat <= safe <= default
+ */
+static const struct btrfs_fs_feature {
+ const char *name;
+ u64 flag;
+ const char *sysfs_name;
+ /*
+ * Compatibility with kernel of given version. Filesystem can be
+ * mounted.
+ */
+ const char *compat_str;
+ u32 compat_ver;
+ /*
+ * Considered safe for use, but is not on by default, even if the
+ * kernel supports the feature.
+ */
+ const char *safe_str;
+ u32 safe_ver;
+ /*
+ * Considered safe for use and will be turned on by default if
+ * supported by the running kernel.
+ */
+ const char *default_str;
+ u32 default_ver;
+ const char *desc;
+} mkfs_features[] = {
+ { "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
+ "mixed_groups",
+ VERSION_TO_STRING3(2,6,37),
+ VERSION_TO_STRING3(2,6,37),
+ NULL, 0,
+ "mixed data and metadata block groups" },
+ { "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
+ "extended_iref",
+ VERSION_TO_STRING2(3,7),
+ VERSION_TO_STRING2(3,12),
+ VERSION_TO_STRING2(3,12),
+ "increased hardlink limit per file to 65536" },
+ { "raid56", BTRFS_FEATURE_INCOMPAT_RAID56,
+ "raid56",
+ VERSION_TO_STRING2(3,9),
+ NULL, 0,
+ NULL, 0,
+ "raid56 extended format" },
+ { "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
+ "skinny_metadata",
+ VERSION_TO_STRING2(3,10),
+ VERSION_TO_STRING2(3,18),
+ VERSION_TO_STRING2(3,18),
+ "reduced-size metadata extent refs" },
+ { "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES,
+ "no_holes",
+ VERSION_TO_STRING2(3,14),
+ VERSION_TO_STRING2(4,0),
+ NULL, 0,
+ "no explicit hole extents for files" },
+ /* Keep this one last */
+ { "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
+};
+
+static int parse_one_fs_feature(const char *name, u64 *flags)
+{
+ int i;
+ int found = 0;
+
+ for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
+ if (name[0] == '^' &&
+ !strcmp(mkfs_features[i].name, name + 1)) {
+ *flags &= ~ mkfs_features[i].flag;
+ found = 1;
+ } else if (!strcmp(mkfs_features[i].name, name)) {
+ *flags |= mkfs_features[i].flag;
+ found = 1;
+ }
+ }
+
+ return !found;
+}
+
+void btrfs_parse_features_to_string(char *buf, u64 flags)
+{
+ int i;
+
+ buf[0] = 0;
+
+ for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
+ if (flags & mkfs_features[i].flag) {
+ if (*buf)
+ strcat(buf, ", ");
+ strcat(buf, mkfs_features[i].name);
+ }
+ }
+}
+
+void btrfs_process_fs_features(u64 flags)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
+ if (flags & mkfs_features[i].flag) {
+ printf("Turning ON incompat feature '%s': %s\n",
+ mkfs_features[i].name,
+ mkfs_features[i].desc);
+ }
+ }
+}
+
+void btrfs_list_all_fs_features(u64 mask_disallowed)
+{
+ int i;
+
+ fprintf(stderr, "Filesystem features available:\n");
+ for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
+ const struct btrfs_fs_feature *feat = &mkfs_features[i];
+
+ if (feat->flag & mask_disallowed)
+ continue;
+ fprintf(stderr, "%-20s- %s (0x%llx", feat->name, feat->desc,
+ feat->flag);
+ if (feat->compat_ver)
+ fprintf(stderr, ", compat=%s", feat->compat_str);
+ if (feat->safe_ver)
+ fprintf(stderr, ", safe=%s", feat->safe_str);
+ if (feat->default_ver)
+ fprintf(stderr, ", default=%s", feat->default_str);
+ fprintf(stderr, ")\n");
+ }
+}
+
+/*
+ * Return NULL if all features were parsed fine, otherwise return the name of
+ * the first unparsed.
+ */
+char* btrfs_parse_fs_features(char *namelist, u64 *flags)
+{
+ char *this_char;
+ char *save_ptr = NULL; /* Satisfy static checkers */
+
+ for (this_char = strtok_r(namelist, ",", &save_ptr);
+ this_char != NULL;
+ this_char = strtok_r(NULL, ",", &save_ptr)) {
+ if (parse_one_fs_feature(this_char, flags))
+ return this_char;
+ }
+
+ return NULL;
+}
+
+void print_kernel_version(FILE *stream, u32 version)
+{
+ u32 v[3];
+
+ v[0] = version & 0xFF;
+ v[1] = (version >> 8) & 0xFF;
+ v[2] = version >> 16;
+ fprintf(stream, "%u.%u", v[2], v[1]);
+ if (v[0])
+ fprintf(stream, ".%u", v[0]);
+}
+
+u32 get_running_kernel_version(void)
+{
+ struct utsname utsbuf;
+ char *tmp;
+ char *saveptr = NULL;
+ u32 version;
+
+ uname(&utsbuf);
+ if (strcmp(utsbuf.sysname, "Linux") != 0) {
+ error("unsupported system: %s", utsbuf.sysname);
+ exit(1);
+ }
+ /* 1.2.3-4-name */
+ tmp = strchr(utsbuf.release, '-');
+ if (tmp)
+ *tmp = 0;
+
+ tmp = strtok_r(utsbuf.release, ".", &saveptr);
+ if (!string_is_numerical(tmp))
+ return (u32)-1;
+ version = atoi(tmp) << 16;
+ tmp = strtok_r(NULL, ".", &saveptr);
+ if (!string_is_numerical(tmp))
+ return (u32)-1;
+ version |= atoi(tmp) << 8;
+ tmp = strtok_r(NULL, ".", &saveptr);
+ if (tmp) {
+ if (!string_is_numerical(tmp))
+ return (u32)-1;
+ version |= atoi(tmp);
+ }
+
+ return version;
+}
+
+u64 btrfs_device_size(int fd, struct stat *st)
+{
+ u64 size;
+ if (S_ISREG(st->st_mode)) {
+ return st->st_size;
+ }
+ if (!S_ISBLK(st->st_mode)) {
+ return 0;
+ }
+ if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
+ return size;
+ }
+ return 0;
+}
+
+static int zero_blocks(int fd, off_t start, size_t len)
+{
+ char *buf = malloc(len);
+ int ret = 0;
+ ssize_t written;
+
+ if (!buf)
+ return -ENOMEM;
+ memset(buf, 0, len);
+ written = pwrite(fd, buf, len, start);
+ if (written != len)
+ ret = -EIO;
+ free(buf);
+ return ret;
+}
+
+#define ZERO_DEV_BYTES (2 * 1024 * 1024)
+
+/* don't write outside the device by clamping the region to the device size */
+static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
+{
+ off_t end = max(start, start + len);
+
+#ifdef __sparc__
+ /* and don't overwrite the disk labels on sparc */
+ start = max(start, 1024);
+ end = max(end, 1024);
+#endif
+
+ start = min_t(u64, start, dev_size);
+ end = min_t(u64, end, dev_size);
+
+ return zero_blocks(fd, start, end - start);
+}
+
+int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, int fd, const char *path,
+ u64 device_total_bytes, u32 io_width, u32 io_align,
+ u32 sectorsize)
+{
+ struct btrfs_super_block *disk_super;
+ struct btrfs_super_block *super = root->fs_info->super_copy;
+ struct btrfs_device *device;
+ struct btrfs_dev_item *dev_item;
+ char *buf = NULL;
+ u64 fs_total_bytes;
+ u64 num_devs;
+ int ret;
+
+ device_total_bytes = (device_total_bytes / sectorsize) * sectorsize;
+
+ device = calloc(1, sizeof(*device));
+ if (!device) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ buf = calloc(1, sectorsize);
+ if (!buf) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ disk_super = (struct btrfs_super_block *)buf;
+ dev_item = &disk_super->dev_item;
+
+ uuid_generate(device->uuid);
+ device->devid = 0;
+ device->type = 0;
+ device->io_width = io_width;
+ device->io_align = io_align;
+ device->sector_size = sectorsize;
+ device->fd = fd;
+ device->writeable = 1;
+ device->total_bytes = device_total_bytes;
+ device->bytes_used = 0;
+ device->total_ios = 0;
+ device->dev_root = root->fs_info->dev_root;
+ device->name = strdup(path);
+ if (!device->name) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ INIT_LIST_HEAD(&device->dev_list);
+ ret = btrfs_add_device(trans, root, device);
+ if (ret)
+ goto out;
+
+ fs_total_bytes = btrfs_super_total_bytes(super) + device_total_bytes;
+ btrfs_set_super_total_bytes(super, fs_total_bytes);
+
+ num_devs = btrfs_super_num_devices(super) + 1;
+ btrfs_set_super_num_devices(super, num_devs);
+
+ memcpy(disk_super, super, sizeof(*disk_super));
+
+ btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
+ btrfs_set_stack_device_id(dev_item, device->devid);
+ btrfs_set_stack_device_type(dev_item, device->type);
+ btrfs_set_stack_device_io_align(dev_item, device->io_align);
+ btrfs_set_stack_device_io_width(dev_item, device->io_width);
+ btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
+ btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
+ btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
+ memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
+
+ ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
+ BUG_ON(ret != sectorsize);
- kfree(buf);
+ free(buf);
list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
device->fs_devices = root->fs_info->fs_devices;
return 0;
+
+out:
+ free(device);
+ free(buf);
+ return ret;
+}
+
+static int btrfs_wipe_existing_sb(int fd)
+{
+ const char *off = NULL;
+ size_t len = 0;
+ loff_t offset;
+ char buf[BUFSIZ];
+ int ret = 0;
+ blkid_probe pr = NULL;
+
+ pr = blkid_new_probe();
+ if (!pr)
+ return -1;
+
+ if (blkid_probe_set_device(pr, fd, 0, 0)) {
+ ret = -1;
+ goto out;
+ }
+
+ ret = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
+ if (!ret)
+ ret = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
+
+ if (ret || len == 0 || off == NULL) {
+ /*
+ * If lookup fails, the probe did not find any values, eg. for
+ * a file image or a loop device. Soft error.
+ */
+ ret = 1;
+ goto out;
+ }
+
+ offset = strtoll(off, NULL, 10);
+ if (len > sizeof(buf))
+ len = sizeof(buf);
+
+ memset(buf, 0, len);
+ ret = pwrite(fd, buf, len, offset);
+ if (ret < 0) {
+ error("cannot wipe existing superblock: %s", strerror(errno));
+ ret = -1;
+ } else if (ret != len) {
+ error("cannot wipe existing superblock: wrote %d of %zd", ret, len);
+ ret = -1;
+ }
+ fsync(fd);
+
+out:
+ blkid_free_probe(pr);
+ return ret;
}
-int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
- u64 max_block_count, int *mixed, int discard)
+int btrfs_prepare_device(int fd, const char *file, u64 *block_count_ret,
+ u64 max_block_count, unsigned opflags)
{
u64 block_count;
- u64 bytenr;
struct stat st;
int i, ret;
ret = fstat(fd, &st);
if (ret < 0) {
- fprintf(stderr, "unable to stat %s\n", file);
- exit(1);
+ error("unable to stat %s: %s", file, strerror(errno));
+ return 1;
}
block_count = btrfs_device_size(fd, &st);
if (block_count == 0) {
- fprintf(stderr, "unable to find %s size\n", file);
- exit(1);
+ error("unable to determine size of %s", file);
+ return 1;
}
if (max_block_count)
block_count = min(block_count, max_block_count);
- zero_end = 1;
- if (block_count < 1024 * 1024 * 1024 && !(*mixed)) {
- printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
- *mixed = 1;
- }
-
- if (discard) {
+ if (opflags & PREP_DEVICE_DISCARD) {
/*
* We intentionally ignore errors from the discard ioctl. It
* is not necessary for the mkfs functionality but just an
* optimization.
*/
- if (discard_blocks(fd, 0, 0) == 0) {
- fprintf(stderr, "Performing full device TRIM (%s) ...\n",
- pretty_size(block_count));
+ if (discard_range(fd, 0, 0) == 0) {
+ if (opflags & PREP_DEVICE_VERBOSE)
+ printf("Performing full device TRIM (%s) ...\n",
+ pretty_size(block_count));
discard_blocks(fd, 0, block_count);
}
}
- ret = zero_dev_start(fd);
- if (ret) {
- fprintf(stderr, "failed to zero device start %d\n", ret);
- exit(1);
- }
+ ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
+ for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
+ ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
+ BTRFS_SUPER_INFO_SIZE, block_count);
+ if (!ret && (opflags & PREP_DEVICE_ZERO_END))
+ ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
+ ZERO_DEV_BYTES, block_count);
- for (i = 0 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
- bytenr = btrfs_sb_offset(i);
- if (bytenr >= block_count)
- break;
- zero_blocks(fd, bytenr, BTRFS_SUPER_INFO_SIZE);
+ if (ret < 0) {
+ error("failed to zero device '%s': %s", file, strerror(-ret));
+ return 1;
}
- if (zero_end) {
- ret = zero_dev_end(fd, block_count);
- if (ret) {
- fprintf(stderr, "failed to zero device end %d\n", ret);
- exit(1);
- }
+ ret = btrfs_wipe_existing_sb(fd);
+ if (ret < 0) {
+ error("cannot wipe superblocks on %s", file);
+ return 1;
}
+
*block_count_ret = block_count;
return 0;
}
btrfs_set_stack_inode_generation(&inode_item, trans->transid);
btrfs_set_stack_inode_size(&inode_item, 0);
btrfs_set_stack_inode_nlink(&inode_item, 1);
- btrfs_set_stack_inode_nbytes(&inode_item, root->leafsize);
+ btrfs_set_stack_inode_nbytes(&inode_item, root->nodesize);
btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
btrfs_set_stack_timespec_sec(&inode_item.atime, now);
btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
- btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
+ btrfs_set_stack_timespec_sec(&inode_item.otime, now);
btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
if (root->fs_info->tree_root == root)
* Returns negative errno on failure, otherwise
* returns 1 for blockdev, 0 for not-blockdev
*/
-int is_block_device(const char *path) {
+int is_block_device(const char *path)
+{
+ struct stat statbuf;
+
+ if (stat(path, &statbuf) < 0)
+ return -errno;
+
+ return !!S_ISBLK(statbuf.st_mode);
+}
+
+/*
+ * check if given path is a mount point
+ * return 1 if yes. 0 if no. -1 for error
+ */
+int is_mount_point(const char *path)
+{
+ FILE *f;
+ struct mntent *mnt;
+ int ret = 0;
+
+ f = setmntent("/proc/self/mounts", "r");
+ if (f == NULL)
+ return -1;
+
+ while ((mnt = getmntent(f)) != NULL) {
+ if (strcmp(mnt->mnt_dir, path))
+ continue;
+ ret = 1;
+ break;
+ }
+ endmntent(f);
+ return ret;
+}
+
+static int is_reg_file(const char *path)
+{
struct stat statbuf;
if (stat(path, &statbuf) < 0)
return -errno;
+ return S_ISREG(statbuf.st_mode);
+}
- return S_ISBLK(statbuf.st_mode);
+/*
+ * This function checks if the given input parameter is
+ * an uuid or a path
+ * return <0 : some error in the given input
+ * return BTRFS_ARG_UNKNOWN: unknown input
+ * return BTRFS_ARG_UUID: given input is uuid
+ * return BTRFS_ARG_MNTPOINT: given input is path
+ * return BTRFS_ARG_REG: given input is regular file
+ * return BTRFS_ARG_BLKDEV: given input is block device
+ */
+int check_arg_type(const char *input)
+{
+ uuid_t uuid;
+ char path[PATH_MAX];
+
+ if (!input)
+ return -EINVAL;
+
+ if (realpath(input, path)) {
+ if (is_block_device(path) == 1)
+ return BTRFS_ARG_BLKDEV;
+
+ if (is_mount_point(path) == 1)
+ return BTRFS_ARG_MNTPOINT;
+
+ if (is_reg_file(path))
+ return BTRFS_ARG_REG;
+
+ return BTRFS_ARG_UNKNOWN;
+ }
+
+ if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
+ !uuid_parse(input, uuid))
+ return BTRFS_ARG_UUID;
+
+ return BTRFS_ARG_UNKNOWN;
}
/*
ret = is_block_device(dev);
if (ret <= 0) {
if (!ret) {
- fprintf(stderr, "%s is not a block device\n", dev);
+ error("not a block device: %s", dev);
ret = -EINVAL;
} else {
- fprintf(stderr, "Could not check %s: %s\n",
- dev, strerror(-ret));
+ error("cannot check %s: %s", dev, strerror(-ret));
}
goto out;
}
fd = open(dev, O_RDONLY);
if (fd < 0) {
ret = -errno;
- fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
+ error("cannot open %s: %s", dev, strerror(errno));
goto out;
}
*
* On error, return -1, errno should be set.
*/
-int open_path_or_dev_mnt(const char *path, DIR **dirstream)
+int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose)
{
- char mp[BTRFS_PATH_NAME_MAX + 1];
- int fdmnt;
+ char mp[PATH_MAX];
+ int ret;
if (is_block_device(path)) {
- int ret;
-
ret = get_btrfs_mount(path, mp, sizeof(mp));
if (ret < 0) {
/* not a mounted btrfs dev */
+ error_on(verbose, "'%s' is not a mounted btrfs device",
+ path);
errno = EINVAL;
return -1;
}
- fdmnt = open_file_or_dir(mp, dirstream);
+ ret = open_file_or_dir(mp, dirstream);
+ error_on(verbose && ret < 0, "can't access '%s': %s",
+ path, strerror(errno));
} else {
- fdmnt = open_file_or_dir(path, dirstream);
+ ret = btrfs_open_dir(path, dirstream, 1);
+ }
+
+ return ret;
+}
+
+/*
+ * Do the following checks before calling open_file_or_dir():
+ * 1: path is in a btrfs filesystem
+ * 2: path is a directory
+ */
+int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
+{
+ struct statfs stfs;
+ struct stat st;
+ int ret;
+
+ if (statfs(path, &stfs) != 0) {
+ error_on(verbose, "cannot access '%s': %s", path,
+ strerror(errno));
+ return -1;
+ }
+
+ if (stfs.f_type != BTRFS_SUPER_MAGIC) {
+ error_on(verbose, "not a btrfs filesystem: %s", path);
+ return -2;
+ }
+
+ if (stat(path, &st) != 0) {
+ error_on(verbose, "cannot access '%s': %s", path,
+ strerror(errno));
+ return -1;
+ }
+
+ if (!S_ISDIR(st.st_mode)) {
+ error_on(verbose, "not a directory: %s", path);
+ return -3;
+ }
+
+ ret = open_file_or_dir(path, dirstream);
+ if (ret < 0) {
+ error_on(verbose, "cannot access '%s': %s", path,
+ strerror(errno));
+ }
+
+ return ret;
+}
+
+/* checks if a device is a loop device */
+static int is_loop_device (const char* device) {
+ struct stat statbuf;
+
+ if(stat(device, &statbuf) < 0)
+ return -errno;
+
+ return (S_ISBLK(statbuf.st_mode) &&
+ MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
+}
+
+/*
+ * Takes a loop device path (e.g. /dev/loop0) and returns
+ * the associated file (e.g. /images/my_btrfs.img) using
+ * loopdev API
+ */
+static int resolve_loop_device_with_loopdev(const char* loop_dev, char* loop_file)
+{
+ int fd;
+ int ret;
+ struct loop_info64 lo64;
+
+ fd = open(loop_dev, O_RDONLY | O_NONBLOCK);
+ if (fd < 0)
+ return -errno;
+ ret = ioctl(fd, LOOP_GET_STATUS64, &lo64);
+ if (ret < 0) {
+ ret = -errno;
+ goto out;
}
- return fdmnt;
-}
-
-/* checks if a device is a loop device */
-static int is_loop_device (const char* device) {
- struct stat statbuf;
+ memcpy(loop_file, lo64.lo_file_name, sizeof(lo64.lo_file_name));
+ loop_file[sizeof(lo64.lo_file_name)] = 0;
- if(stat(device, &statbuf) < 0)
- return -errno;
+out:
+ close(fd);
- return (S_ISBLK(statbuf.st_mode) &&
- MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
+ return ret;
}
-
/* Takes a loop device path (e.g. /dev/loop0) and returns
* the associated file (e.g. /images/my_btrfs.img) */
static int resolve_loop_device(const char* loop_dev, char* loop_file,
if (!realpath(loop_dev, real_loop_dev))
return -errno;
snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
- if (!(f = fopen(p, "r")))
+ if (!(f = fopen(p, "r"))) {
+ if (errno == ENOENT)
+ /*
+ * It's possibly a partitioned loop device, which is
+ * resolvable with loopdev API.
+ */
+ return resolve_loop_device_with_loopdev(loop_dev, loop_file);
return -errno;
+ }
snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
ret = fscanf(f, fmt, loop_file);
return 0;
}
-/* Checks whether a and b are identical or device
+/*
+ * Checks whether a and b are identical or device
* files associated with the same block device
*/
static int is_same_blk_file(const char* a, const char* b)
char real_a[PATH_MAX];
char real_b[PATH_MAX];
- if(!realpath(a, real_a) ||
- !realpath(b, real_b))
- {
- return -errno;
- }
+ if (!realpath(a, real_a))
+ strncpy_null(real_a, a);
+
+ if (!realpath(b, real_b))
+ strncpy_null(real_b, b);
/* Identical path? */
- if(strcmp(real_a, real_b) == 0)
+ if (strcmp(real_a, real_b) == 0)
return 1;
- if(stat(a, &st_buf_a) < 0 ||
- stat(b, &st_buf_b) < 0)
- {
+ if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
if (errno == ENOENT)
return 0;
return -errno;
}
/* Same blockdevice? */
- if(S_ISBLK(st_buf_a.st_mode) &&
- S_ISBLK(st_buf_b.st_mode) &&
- st_buf_a.st_rdev == st_buf_b.st_rdev)
- {
+ if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
+ st_buf_a.st_rdev == st_buf_b.st_rdev) {
return 1;
}
/* Hardlink? */
if (st_buf_a.st_dev == st_buf_b.st_dev &&
- st_buf_a.st_ino == st_buf_b.st_ino)
- {
+ st_buf_a.st_ino == st_buf_b.st_ino) {
return 1;
}
{
char res_a[PATH_MAX];
char res_b[PATH_MAX];
- const char* final_a;
- const char* final_b;
+ const char* final_a = NULL;
+ const char* final_b = NULL;
int ret;
/* Resolve a if it is a loop device */
return 0;
return ret;
} else if (ret) {
- if ((ret = resolve_loop_device(a, res_a, sizeof(res_a))) < 0)
- return ret;
-
- final_a = res_a;
+ ret = resolve_loop_device(a, res_a, sizeof(res_a));
+ if (ret < 0) {
+ if (errno != EPERM)
+ return ret;
+ } else {
+ final_a = res_a;
+ }
} else {
final_a = a;
}
return 0;
return ret;
} else if (ret) {
- if((ret = resolve_loop_device(b, res_b, sizeof(res_b))) < 0)
- return ret;
-
- final_b = res_b;
+ ret = resolve_loop_device(b, res_b, sizeof(res_b));
+ if (ret < 0) {
+ if (errno != EPERM)
+ return ret;
+ } else {
+ final_b = res_b;
+ }
} else {
final_b = b;
}
}
/*
+ * Resolve a pathname to a device mapper node to /dev/mapper/<name>
+ * Returns NULL on invalid input or malloc failure; Other failures
+ * will be handled by the caller using the input pathame.
+ */
+char *canonicalize_dm_name(const char *ptname)
+{
+ FILE *f;
+ size_t sz;
+ char path[PATH_MAX], name[PATH_MAX], *res = NULL;
+
+ if (!ptname || !*ptname)
+ return NULL;
+
+ snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
+ if (!(f = fopen(path, "r")))
+ return NULL;
+
+ /* read <name>\n from sysfs */
+ if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
+ name[sz - 1] = '\0';
+ snprintf(path, sizeof(path), "/dev/mapper/%s", name);
+
+ if (access(path, F_OK) == 0)
+ res = strdup(path);
+ }
+ fclose(f);
+ return res;
+}
+
+/*
+ * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
+ * to a device mapper pathname.
+ * Returns NULL on invalid input or malloc failure; Other failures
+ * will be handled by the caller using the input pathame.
+ */
+char *canonicalize_path(const char *path)
+{
+ char *canonical, *p;
+
+ if (!path || !*path)
+ return NULL;
+
+ canonical = realpath(path, NULL);
+ if (!canonical)
+ return strdup(path);
+ p = strrchr(canonical, '/');
+ if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
+ char *dm = canonicalize_dm_name(p + 1);
+
+ if (dm) {
+ free(canonical);
+ return dm;
+ }
+ }
+ return canonical;
+}
+
+/*
* returns 1 if the device was mounted, < 0 on error or 0 if everything
* is safe to continue.
*/
fd = open(file, O_RDONLY);
if (fd < 0) {
- fprintf (stderr, "check_mounted(): Could not open %s\n", file);
+ error("mount check: cannot open %s: %s", file,
+ strerror(errno));
return -errno;
}
/* scan the initial device */
ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
- &total_devs, BTRFS_SUPER_INFO_OFFSET);
+ &total_devs, BTRFS_SUPER_INFO_OFFSET, SBREAD_DEFAULT);
is_btrfs = (ret >= 0);
/* scan other devices */
if (is_btrfs && total_devs > 1) {
- if ((ret = btrfs_scan_for_fsid(!BTRFS_UPDATE_KERNEL)))
+ ret = btrfs_scan_devices();
+ if (ret)
return ret;
}
- /* iterate over the list of currently mountes filesystems */
- if ((f = setmntent ("/proc/mounts", "r")) == NULL)
+ /* iterate over the list of currently mounted filesystems */
+ if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
return -errno;
while ((mnt = getmntent (f)) != NULL) {
char name[PATH_MAX];
};
-void btrfs_register_one_device(char *fname)
+int btrfs_register_one_device(const char *fname)
{
struct btrfs_ioctl_vol_args args;
int fd;
int ret;
- int e;
- fd = open("/dev/btrfs-control", O_RDONLY);
+ fd = open("/dev/btrfs-control", O_RDWR);
if (fd < 0) {
- fprintf(stderr, "failed to open /dev/btrfs-control "
- "skipping device registration: %s\n",
+ warning(
+ "failed to open /dev/btrfs-control, skipping device registration: %s",
strerror(errno));
- return;
+ return -errno;
}
- strncpy(args.name, fname, BTRFS_PATH_NAME_MAX);
- args.name[BTRFS_PATH_NAME_MAX-1] = 0;
+ memset(&args, 0, sizeof(args));
+ strncpy_null(args.name, fname);
ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
- e = errno;
- if(ret<0){
- fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
- fname, strerror(e));
+ if (ret < 0) {
+ error("device scan failed on '%s': %s", fname,
+ strerror(errno));
+ ret = -errno;
}
close(fd);
+ return ret;
}
-int btrfs_scan_one_dir(char *dirname, int run_ioctl)
+/*
+ * Register all devices in the fs_uuid list created in the user
+ * space. Ensure btrfs_scan_devices() is called before this func.
+ */
+int btrfs_register_all_devices(void)
{
- DIR *dirp = NULL;
- struct dirent *dirent;
- struct pending_dir *pending;
- struct stat st;
- int ret;
- int fd;
- int dirname_len;
- char *fullpath;
- struct list_head pending_list;
- struct btrfs_fs_devices *tmp_devices;
- u64 num_devices;
-
- INIT_LIST_HEAD(&pending_list);
+ int err = 0;
+ int ret = 0;
+ struct btrfs_fs_devices *fs_devices;
+ struct btrfs_device *device;
+ struct list_head *all_uuids;
- pending = malloc(sizeof(*pending));
- if (!pending)
- return -ENOMEM;
- strcpy(pending->name, dirname);
+ all_uuids = btrfs_scanned_uuids();
-again:
- dirname_len = strlen(pending->name);
- fullpath = malloc(PATH_MAX);
- dirname = pending->name;
+ list_for_each_entry(fs_devices, all_uuids, list) {
+ list_for_each_entry(device, &fs_devices->devices, dev_list) {
+ if (*device->name)
+ err = btrfs_register_one_device(device->name);
- if (!fullpath) {
- ret = -ENOMEM;
- goto fail;
- }
- dirp = opendir(dirname);
- if (!dirp) {
- fprintf(stderr, "Unable to open %s for scanning\n", dirname);
- ret = -ENOENT;
- goto fail;
- }
- while(1) {
- dirent = readdir(dirp);
- if (!dirent)
- break;
- if (dirent->d_name[0] == '.')
- continue;
- if (dirname_len + strlen(dirent->d_name) + 2 > PATH_MAX) {
- ret = -EFAULT;
- goto fail;
- }
- snprintf(fullpath, PATH_MAX, "%s/%s", dirname, dirent->d_name);
- ret = lstat(fullpath, &st);
- if (ret < 0) {
- fprintf(stderr, "failed to stat %s\n", fullpath);
- continue;
- }
- if (S_ISLNK(st.st_mode))
- continue;
- if (S_ISDIR(st.st_mode)) {
- struct pending_dir *next = malloc(sizeof(*next));
- if (!next) {
- ret = -ENOMEM;
- goto fail;
- }
- strcpy(next->name, fullpath);
- list_add_tail(&next->list, &pending_list);
- }
- if (!S_ISBLK(st.st_mode)) {
- continue;
- }
- fd = open(fullpath, O_RDONLY);
- if (fd < 0) {
- /* ignore the following errors:
- ENXIO (device don't exists)
- ENOMEDIUM (No medium found ->
- like a cd tray empty)
- */
- if(errno != ENXIO && errno != ENOMEDIUM)
- fprintf(stderr, "failed to read %s: %s\n",
- fullpath, strerror(errno));
- continue;
- }
- ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
- &num_devices,
- BTRFS_SUPER_INFO_OFFSET);
- if (ret == 0 && run_ioctl > 0) {
- btrfs_register_one_device(fullpath);
+ if (err)
+ ret++;
}
- close(fd);
- }
- if (!list_empty(&pending_list)) {
- free(pending);
- pending = list_entry(pending_list.next, struct pending_dir,
- list);
- free(fullpath);
- list_del(&pending->list);
- closedir(dirp);
- dirp = NULL;
- goto again;
}
- ret = 0;
-fail:
- free(pending);
- free(fullpath);
- while (!list_empty(&pending_list)) {
- pending = list_entry(pending_list.next, struct pending_dir,
- list);
- list_del(&pending->list);
- free(pending);
- }
- if (dirp)
- closedir(dirp);
- return ret;
-}
-
-int btrfs_scan_for_fsid(int run_ioctls)
-{
- int ret;
- ret = scan_for_btrfs(BTRFS_SCAN_PROC, run_ioctls);
- if (ret)
- ret = scan_for_btrfs(BTRFS_SCAN_DEV, run_ioctls);
return ret;
}
ret = 0;
disk_super = (struct btrfs_super_block *)buf;
- if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
+ /*
+ * Accept devices from the same filesystem, allow partially created
+ * structures.
+ */
+ if (btrfs_super_magic(disk_super) != BTRFS_MAGIC &&
+ btrfs_super_magic(disk_super) != BTRFS_MAGIC_PARTIAL)
goto brelse;
if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
return ret;
}
-static char *size_strs[] = { "", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
-int pretty_size_snprintf(double size, char *str, size_t str_bytes)
+/*
+ * Note: this function uses a static per-thread buffer. Do not call this
+ * function more than 10 times within one argument list!
+ */
+const char *pretty_size_mode(u64 size, unsigned mode)
+{
+ static __thread int ps_index = 0;
+ static __thread char ps_array[10][32];
+ char *ret;
+
+ ret = ps_array[ps_index];
+ ps_index++;
+ ps_index %= 10;
+ (void)pretty_size_snprintf(size, ret, 32, mode);
+
+ return ret;
+}
+
+static const char* unit_suffix_binary[] =
+ { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
+static const char* unit_suffix_decimal[] =
+ { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
+
+int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
{
- int num_divs = 0;
+ int num_divs;
float fraction;
+ u64 base = 0;
+ int mult = 0;
+ const char** suffix = NULL;
+ u64 last_size;
- if (str_bytes == 0)
+ if (str_size == 0)
return 0;
- if( size < 1024 ){
- fraction = size;
- num_divs = 0;
- } else {
- u64 last_size = size;
- num_divs = 0;
- while(size >= 1024){
+ if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
+ snprintf(str, str_size, "%llu", size);
+ return 0;
+ }
+
+ if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
+ base = 1024;
+ mult = 1024;
+ suffix = unit_suffix_binary;
+ } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
+ base = 1000;
+ mult = 1000;
+ suffix = unit_suffix_decimal;
+ }
+
+ /* Unknown mode */
+ if (!base) {
+ fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
+ unit_mode);
+ assert(0);
+ return -1;
+ }
+
+ num_divs = 0;
+ last_size = size;
+ switch (unit_mode & UNITS_MODE_MASK) {
+ case UNITS_TBYTES: base *= mult; num_divs++;
+ case UNITS_GBYTES: base *= mult; num_divs++;
+ case UNITS_MBYTES: base *= mult; num_divs++;
+ case UNITS_KBYTES: num_divs++;
+ break;
+ case UNITS_BYTES:
+ base = 1;
+ num_divs = 0;
+ break;
+ default:
+ while (size >= mult) {
last_size = size;
- size /= 1024;
- num_divs ++;
+ size /= mult;
+ num_divs++;
}
+ /*
+ * If the value is smaller than base, we didn't do any
+ * division, in that case, base should be 1, not original
+ * base, or the unit will be wrong
+ */
+ if (num_divs == 0)
+ base = 1;
+ }
- if (num_divs >= ARRAY_SIZE(size_strs)) {
- str[0] = '\0';
- return -1;
- }
- fraction = (float)last_size / 1024;
+ if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
+ str[0] = '\0';
+ printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
+ num_divs);
+ assert(0);
+ return -1;
}
- return snprintf(str, str_bytes, "%.2f%s", fraction,
- size_strs[num_divs]);
+ fraction = (float)last_size / base;
+
+ return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
}
/*
- * __strncpy__null - strncpy with null termination
+ * __strncpy_null - strncpy with null termination
* @dest: the target array
* @src: the source string
* @n: maximum bytes to copy (size of *dest)
* byte ('\0'), to the buffer pointed to by dest, up to a maximum
* of n bytes. Then ensure that dest is null-terminated.
*/
-char *__strncpy__null(char *dest, const char *src, size_t n)
+char *__strncpy_null(char *dest, const char *src, size_t n)
{
strncpy(dest, src, n);
if (n > 0)
int len = strlen(input);
if (len > BTRFS_LABEL_SIZE - 1) {
- fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
- input, BTRFS_LABEL_SIZE - 1);
+ error("label %s is too long (max %d)", input,
+ BTRFS_LABEL_SIZE - 1);
return -1;
}
ret = check_mounted(dev);
if (ret < 0) {
- fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
+ error("checking mount status of %s failed: %d", dev, ret);
return -1;
}
if (ret > 0) {
- fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
- dev);
+ error("device %s is mounted, use mount point", dev);
return -1;
}
/* Open the super_block at the default location
* and as read-write.
*/
- root = open_ctree(dev, 0, 1);
+ root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
if (!root) /* errors are printed by open_ctree() */
return -1;
trans = btrfs_start_transaction(root, 1);
- snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
- label);
+ __strncpy_null(root->fs_info->super_copy->label, label, BTRFS_LABEL_SIZE - 1);
+
btrfs_commit_transaction(trans, root);
/* Now we close it since we are done. */
return 0;
}
-static int set_label_mounted(const char *mount_path, const char *label)
+static int set_label_mounted(const char *mount_path, const char *labelp)
{
int fd;
+ char label[BTRFS_LABEL_SIZE];
fd = open(mount_path, O_RDONLY | O_NOATIME);
if (fd < 0) {
- fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
+ error("unable to access %s: %s", mount_path, strerror(errno));
return -1;
}
+ memset(label, 0, sizeof(label));
+ __strncpy_null(label, labelp, BTRFS_LABEL_SIZE - 1);
if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
- fprintf(stderr, "ERROR: unable to set label %s\n",
- strerror(errno));
+ error("unable to set label of %s: %s", mount_path,
+ strerror(errno));
close(fd);
return -1;
}
return 0;
}
-static int get_label_unmounted(const char *dev)
+int get_label_unmounted(const char *dev, char *label)
{
struct btrfs_root *root;
int ret;
ret = check_mounted(dev);
if (ret < 0) {
- fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
+ error("checking mount status of %s failed: %d", dev, ret);
return -1;
}
- if (ret > 0) {
- fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
- dev);
- return -1;
- }
/* Open the super_block at the default location
* and as read-only.
if(!root)
return -1;
- fprintf(stdout, "%s\n", root->fs_info->super_copy->label);
+ __strncpy_null(label, root->fs_info->super_copy->label,
+ BTRFS_LABEL_SIZE - 1);
/* Now we close it since we are done. */
close_ctree(root);
{
char label[BTRFS_LABEL_SIZE];
int fd;
+ int ret;
fd = open(mount_path, O_RDONLY | O_NOATIME);
if (fd < 0) {
- fprintf(stderr, "ERROR: unable access to '%s'\n", mount_path);
+ error("unable to access %s: %s", mount_path, strerror(errno));
return -1;
}
memset(label, '\0', sizeof(label));
- if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
- fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
+ ret = ioctl(fd, BTRFS_IOC_GET_FSLABEL, label);
+ if (ret < 0) {
+ if (errno != ENOTTY)
+ error("unable to get label of %s: %s", mount_path,
+ strerror(errno));
+ ret = -errno;
close(fd);
- return -1;
+ return ret;
}
- strncpy(labelp, label, sizeof(label));
+ __strncpy_null(labelp, label, BTRFS_LABEL_SIZE - 1);
close(fd);
return 0;
}
-int get_label(const char *btrfs_dev)
+int get_label(const char *btrfs_dev, char *label)
{
int ret;
- char label[BTRFS_LABEL_SIZE];
- if (is_existing_blk_or_reg_file(btrfs_dev))
- ret = get_label_unmounted(btrfs_dev);
- else {
+ ret = is_existing_blk_or_reg_file(btrfs_dev);
+ if (!ret)
ret = get_label_mounted(btrfs_dev, label);
- if (!ret)
- fprintf(stdout, "%s\n", label);
- }
+ else if (ret > 0)
+ ret = get_label_unmounted(btrfs_dev, label);
+
return ret;
}
int set_label(const char *btrfs_dev, const char *label)
{
+ int ret;
+
if (check_label(label))
return -1;
- return is_existing_blk_or_reg_file(btrfs_dev) ?
- set_label_unmounted(btrfs_dev, label) :
- set_label_mounted(btrfs_dev, label);
+ ret = is_existing_blk_or_reg_file(btrfs_dev);
+ if (!ret)
+ ret = set_label_mounted(btrfs_dev, label);
+ else if (ret > 0)
+ ret = set_label_unmounted(btrfs_dev, label);
+
+ return ret;
}
-int btrfs_scan_block_devices(int run_ioctl)
+/*
+ * A not-so-good version fls64. No fascinating optimization since
+ * no one except parse_size use it
+ */
+static int fls64(u64 x)
{
-
- struct stat st;
- int ret;
- int fd;
- struct btrfs_fs_devices *tmp_devices;
- u64 num_devices;
- FILE *proc_partitions;
int i;
- char buf[1024];
- char fullpath[110];
- int scans = 0;
- int special;
-
-scan_again:
- proc_partitions = fopen("/proc/partitions","r");
- if (!proc_partitions) {
- fprintf(stderr, "Unable to open '/proc/partitions' for scanning\n");
- return -ENOENT;
- }
- /* skip the header */
- for (i = 0; i < 2; i++)
- if (!fgets(buf, 1023, proc_partitions)) {
- fprintf(stderr,
- "Unable to read '/proc/partitions' for scanning\n");
- fclose(proc_partitions);
- return -ENOENT;
- }
-
- strcpy(fullpath,"/dev/");
- while(fgets(buf, 1023, proc_partitions)) {
- i = sscanf(buf," %*d %*d %*d %99s", fullpath+5);
-
- /*
- * multipath and MD devices may register as a btrfs filesystem
- * both through the original block device and through
- * the special (/dev/mapper or /dev/mdX) entry.
- * This scans the special entries last
- */
- special = strncmp(fullpath, "/dev/dm-", strlen("/dev/dm-")) == 0;
- if (!special)
- special = strncmp(fullpath, "/dev/md", strlen("/dev/md")) == 0;
-
- if (scans == 0 && special)
- continue;
- if (scans > 0 && !special)
- continue;
-
- ret = lstat(fullpath, &st);
- if (ret < 0) {
- fprintf(stderr, "failed to stat %s\n", fullpath);
- continue;
- }
- if (!S_ISBLK(st.st_mode)) {
- continue;
- }
-
- fd = open(fullpath, O_RDONLY);
- if (fd < 0) {
- if (errno != ENOMEDIUM)
- fprintf(stderr, "failed to open %s: %s\n",
- fullpath, strerror(errno));
- continue;
- }
- ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices,
- &num_devices,
- BTRFS_SUPER_INFO_OFFSET);
- if (ret == 0 && run_ioctl > 0) {
- btrfs_register_one_device(fullpath);
- }
- close(fd);
- }
-
- fclose(proc_partitions);
- if (scans == 0) {
- scans++;
- goto scan_again;
- }
- return 0;
+ for (i = 0; i <64; i++)
+ if (x << i & (1ULL << 63))
+ return 64 - i;
+ return 64 - i;
}
u64 parse_size(char *s)
{
- int i;
char c;
+ char *endptr;
u64 mult = 1;
+ u64 ret;
- for (i = 0; s && s[i] && isdigit(s[i]); i++) ;
- if (!i) {
- fprintf(stderr, "ERROR: size value is empty\n");
- exit(50);
+ if (!s) {
+ error("size value is empty");
+ exit(1);
}
-
- if (s[i]) {
- c = tolower(s[i]);
+ if (s[0] == '-') {
+ error("size value '%s' is less equal than 0", s);
+ exit(1);
+ }
+ ret = strtoull(s, &endptr, 10);
+ if (endptr == s) {
+ error("size value '%s' is invalid", s);
+ exit(1);
+ }
+ if (endptr[0] && endptr[1]) {
+ error("illegal suffix contains character '%c' in wrong position",
+ endptr[1]);
+ exit(1);
+ }
+ /*
+ * strtoll returns LLONG_MAX when overflow, if this happens,
+ * need to call strtoull to get the real size
+ */
+ if (errno == ERANGE && ret == ULLONG_MAX) {
+ error("size value '%s' is too large for u64", s);
+ exit(1);
+ }
+ if (endptr[0]) {
+ c = tolower(endptr[0]);
switch (c) {
case 'e':
mult *= 1024;
+ /* fallthrough */
case 'p':
mult *= 1024;
+ /* fallthrough */
case 't':
mult *= 1024;
+ /* fallthrough */
case 'g':
mult *= 1024;
+ /* fallthrough */
case 'm':
mult *= 1024;
+ /* fallthrough */
case 'k':
mult *= 1024;
+ /* fallthrough */
case 'b':
break;
default:
- fprintf(stderr, "ERROR: Unknown size descriptor "
- "'%c'\n", c);
+ error("unknown size descriptor '%c'", c);
exit(1);
}
}
- if (s[i] && s[i+1]) {
- fprintf(stderr, "ERROR: Illegal suffix contains "
- "character '%c' in wrong position\n",
- s[i+1]);
- exit(51);
+ /* Check whether ret * mult overflow */
+ if (fls64(ret) + fls64(mult) - 1 > 64) {
+ error("size value '%s' is too large for u64", s);
+ exit(1);
+ }
+ ret *= mult;
+ return ret;
+}
+
+u64 parse_qgroupid(const char *p)
+{
+ char *s = strchr(p, '/');
+ const char *ptr_src_end = p + strlen(p);
+ char *ptr_parse_end = NULL;
+ u64 level;
+ u64 id;
+ int fd;
+ int ret = 0;
+
+ if (p[0] == '/')
+ goto path;
+
+ /* Numeric format like '0/257' is the primary case */
+ if (!s) {
+ id = strtoull(p, &ptr_parse_end, 10);
+ if (ptr_parse_end != ptr_src_end)
+ goto path;
+ return id;
}
- return strtoull(s, NULL, 10) * mult;
+ level = strtoull(p, &ptr_parse_end, 10);
+ if (ptr_parse_end != s)
+ goto path;
+
+ id = strtoull(s + 1, &ptr_parse_end, 10);
+ if (ptr_parse_end != ptr_src_end)
+ goto path;
+
+ return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
+
+path:
+ /* Path format like subv at 'my_subvol' is the fallback case */
+ ret = test_issubvolume(p);
+ if (ret < 0 || !ret)
+ goto err;
+ fd = open(p, O_RDONLY);
+ if (fd < 0)
+ goto err;
+ ret = lookup_path_rootid(fd, &id);
+ if (ret)
+ error("failed to lookup root id: %s", strerror(-ret));
+ close(fd);
+ if (ret < 0)
+ goto err;
+ return id;
+
+err:
+ error("invalid qgroupid or subvolume path: %s", p);
+ exit(-1);
}
-int open_file_or_dir(const char *fname, DIR **dirstream)
+int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
{
int ret;
struct stat st;
if (S_ISDIR(st.st_mode)) {
*dirstream = opendir(fname);
if (!*dirstream)
- return -2;
+ return -1;
fd = dirfd(*dirstream);
+ } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
+ fd = open(fname, open_flags);
} else {
- fd = open(fname, O_RDWR);
+ /*
+ * we set this on purpose, in case the caller output
+ * strerror(errno) as success
+ */
+ errno = EINVAL;
+ return -1;
}
if (fd < 0) {
- fd = -3;
- if (*dirstream)
+ fd = -1;
+ if (*dirstream) {
closedir(*dirstream);
+ *dirstream = NULL;
+ }
}
return fd;
}
+int open_file_or_dir(const char *fname, DIR **dirstream)
+{
+ return open_file_or_dir3(fname, dirstream, O_RDWR);
+}
+
void close_file_or_dir(int fd, DIR *dirstream)
{
if (dirstream)
close(fd);
}
-static int get_device_info(int fd, u64 devid,
+int get_device_info(int fd, u64 devid,
struct btrfs_ioctl_dev_info_args *di_args)
{
int ret;
memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
- return ret ? -errno : 0;
+ return ret < 0 ? -errno : 0;
+}
+
+static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
+ int nr_items)
+{
+ struct btrfs_dev_item *dev_item;
+ char *buf = search_args->buf;
+
+ buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
+ + sizeof(struct btrfs_dev_item));
+ buf += sizeof(struct btrfs_ioctl_search_header);
+
+ dev_item = (struct btrfs_dev_item *)buf;
+
+ return btrfs_stack_device_id(dev_item);
+}
+
+static int search_chunk_tree_for_fs_info(int fd,
+ struct btrfs_ioctl_fs_info_args *fi_args)
+{
+ int ret;
+ int max_items;
+ u64 start_devid = 1;
+ struct btrfs_ioctl_search_args search_args;
+ struct btrfs_ioctl_search_key *search_key = &search_args.key;
+
+ fi_args->num_devices = 0;
+
+ max_items = BTRFS_SEARCH_ARGS_BUFSIZE
+ / (sizeof(struct btrfs_ioctl_search_header)
+ + sizeof(struct btrfs_dev_item));
+
+ search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
+ search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ search_key->min_type = BTRFS_DEV_ITEM_KEY;
+ search_key->max_type = BTRFS_DEV_ITEM_KEY;
+ search_key->min_transid = 0;
+ search_key->max_transid = (u64)-1;
+ search_key->nr_items = max_items;
+ search_key->max_offset = (u64)-1;
+
+again:
+ search_key->min_offset = start_devid;
+
+ ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
+ if (ret < 0)
+ return -errno;
+
+ fi_args->num_devices += (u64)search_key->nr_items;
+
+ if (search_key->nr_items == max_items) {
+ start_devid = find_max_device_id(&search_args,
+ search_key->nr_items) + 1;
+ goto again;
+ }
+
+ /* get the lastest max_id to stay consistent with the num_devices */
+ if (search_key->nr_items == 0)
+ /*
+ * last tree_search returns an empty buf, use the devid of
+ * the last dev_item of the previous tree_search
+ */
+ fi_args->max_id = start_devid - 1;
+ else
+ fi_args->max_id = find_max_device_id(&search_args,
+ search_key->nr_items);
+
+ return 0;
}
/*
*
* Returns 0 on success, or a negative errno.
*/
-int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
+int get_fs_info(const char *path, struct btrfs_ioctl_fs_info_args *fi_args,
struct btrfs_ioctl_dev_info_args **di_ret)
{
int fd = -1;
int ret = 0;
int ndevs = 0;
- int i = 1;
+ u64 last_devid = 0;
+ int replacing = 0;
struct btrfs_fs_devices *fs_devices_mnt = NULL;
struct btrfs_ioctl_dev_info_args *di_args;
- char mp[BTRFS_PATH_NAME_MAX + 1];
+ struct btrfs_ioctl_dev_info_args tmp;
+ char mp[PATH_MAX];
DIR *dirstream = NULL;
memset(fi_args, 0, sizeof(*fi_args));
- if (is_block_device(path)) {
+ if (is_block_device(path) == 1) {
+ struct btrfs_super_block *disk_super;
+ char buf[BTRFS_SUPER_INFO_SIZE];
+
/* Ensure it's mounted, then set path to the mountpoint */
fd = open(path, O_RDONLY);
if (fd < 0) {
ret = -errno;
- fprintf(stderr, "Couldn't open %s: %s\n",
- path, strerror(errno));
+ error("cannot open %s: %s", path, strerror(errno));
goto out;
}
ret = check_mounted_where(fd, path, mp, sizeof(mp),
path = mp;
/* Only fill in this one device */
fi_args->num_devices = 1;
- fi_args->max_id = fs_devices_mnt->latest_devid;
- i = fs_devices_mnt->latest_devid;
+
+ disk_super = (struct btrfs_super_block *)buf;
+ ret = btrfs_read_dev_super(fd, disk_super,
+ BTRFS_SUPER_INFO_OFFSET, 0);
+ if (ret < 0) {
+ ret = -EIO;
+ goto out;
+ }
+ last_devid = btrfs_stack_device_id(&disk_super->dev_item);
+ fi_args->max_id = last_devid;
+
memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
close(fd);
}
ret = -errno;
goto out;
}
+
+ /*
+ * The fs_args->num_devices does not include seed devices
+ */
+ ret = search_chunk_tree_for_fs_info(fd, fi_args);
+ if (ret)
+ goto out;
+
+ /*
+ * search_chunk_tree_for_fs_info() will lacks the devid 0
+ * so manual probe for it here.
+ */
+ ret = get_device_info(fd, 0, &tmp);
+ if (!ret) {
+ fi_args->num_devices++;
+ ndevs++;
+ replacing = 1;
+ if (last_devid == 0)
+ last_devid++;
+ }
}
if (!fi_args->num_devices)
goto out;
- di_args = *di_ret = malloc(fi_args->num_devices * sizeof(*di_args));
+ di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
if (!di_args) {
ret = -errno;
goto out;
}
- for (; i <= fi_args->max_id; ++i) {
- BUG_ON(ndevs >= fi_args->num_devices);
- ret = get_device_info(fd, i, &di_args[ndevs]);
+ if (replacing)
+ memcpy(di_args, &tmp, sizeof(tmp));
+ for (; last_devid <= fi_args->max_id; last_devid++) {
+ ret = get_device_info(fd, last_devid, &di_args[ndevs]);
if (ret == -ENODEV)
continue;
if (ret)
ndevs++;
}
- BUG_ON(ndevs == 0);
- ret = 0;
+ /*
+ * only when the only dev we wanted to find is not there then
+ * let any error be returned
+ */
+ if (fi_args->num_devices != 1) {
+ BUG_ON(ndevs == 0);
+ ret = 0;
+ }
+
out:
close_file_or_dir(fd, dirstream);
return ret;
* 0 for nothing found
* -1 for internal error
*/
-static int
-check_overwrite(
- char *device)
+static int check_overwrite(const char *device)
{
const char *type;
blkid_probe pr = NULL;
return ret;
}
+static int group_profile_devs_min(u64 flag)
+{
+ switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+ case 0: /* single */
+ case BTRFS_BLOCK_GROUP_DUP:
+ return 1;
+ case BTRFS_BLOCK_GROUP_RAID0:
+ case BTRFS_BLOCK_GROUP_RAID1:
+ case BTRFS_BLOCK_GROUP_RAID5:
+ return 2;
+ case BTRFS_BLOCK_GROUP_RAID6:
+ return 3;
+ case BTRFS_BLOCK_GROUP_RAID10:
+ return 4;
+ default:
+ return -1;
+ }
+}
+
int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
- u64 dev_cnt, int mixed, char *estr)
+ u64 dev_cnt, int mixed, int ssd)
{
- size_t sz = 100;
u64 allowed = 0;
+ u64 profile = metadata_profile | data_profile;
switch (dev_cnt) {
default:
case 2:
allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID5;
- break;
case 1:
allowed |= BTRFS_BLOCK_GROUP_DUP;
}
- if (metadata_profile & ~allowed) {
- snprintf(estr, sz, "unable to create FS with metadata "
- "profile %llu (have %llu devices)\n",
- metadata_profile, dev_cnt);
- return 1;
- }
- if (data_profile & ~allowed) {
- snprintf(estr, sz, "unable to create FS with data "
- "profile %llu (have %llu devices)\n",
- metadata_profile, dev_cnt);
- return 1;
+ if (dev_cnt > 1 && profile & BTRFS_BLOCK_GROUP_DUP) {
+ warning("DUP is not recommended on filesystem with multiple devices");
+ }
+ if (metadata_profile & ~allowed) {
+ fprintf(stderr,
+ "ERROR: unable to create FS with metadata profile %s "
+ "(have %llu devices but %d devices are required)\n",
+ btrfs_group_profile_str(metadata_profile), dev_cnt,
+ group_profile_devs_min(metadata_profile));
+ return 1;
+ }
+ if (data_profile & ~allowed) {
+ fprintf(stderr,
+ "ERROR: unable to create FS with data profile %s "
+ "(have %llu devices but %d devices are required)\n",
+ btrfs_group_profile_str(data_profile), dev_cnt,
+ group_profile_devs_min(data_profile));
+ return 1;
+ }
+
+ if (dev_cnt == 3 && profile & BTRFS_BLOCK_GROUP_RAID6) {
+ warning("RAID6 is not recommended on filesystem with 3 devices only");
+ }
+ if (dev_cnt == 2 && profile & BTRFS_BLOCK_GROUP_RAID5) {
+ warning("RAID5 is not recommended on filesystem with 2 devices only");
+ }
+ warning_on(!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP) && ssd,
+ "DUP may not actually lead to 2 copies on the device, see manual page");
+
+ return 0;
+}
+
+int group_profile_max_safe_loss(u64 flags)
+{
+ switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+ case 0: /* single */
+ case BTRFS_BLOCK_GROUP_DUP:
+ case BTRFS_BLOCK_GROUP_RAID0:
+ return 0;
+ case BTRFS_BLOCK_GROUP_RAID1:
+ case BTRFS_BLOCK_GROUP_RAID5:
+ case BTRFS_BLOCK_GROUP_RAID10:
+ return 1;
+ case BTRFS_BLOCK_GROUP_RAID6:
+ return 2;
+ default:
+ return -1;
+ }
+}
+
+/*
+ * Check if a device is suitable for btrfs
+ * returns:
+ * 1: something is wrong, an error is printed
+ * 0: all is fine
+ */
+int test_dev_for_mkfs(const char *file, int force_overwrite)
+{
+ int ret, fd;
+ struct stat st;
+
+ ret = is_swap_device(file);
+ if (ret < 0) {
+ error("checking status of %s: %s", file, strerror(-ret));
+ return 1;
+ }
+ if (ret == 1) {
+ error("%s is a swap device", file);
+ return 1;
+ }
+ if (!force_overwrite) {
+ if (check_overwrite(file)) {
+ error("use the -f option to force overwrite of %s",
+ file);
+ return 1;
+ }
+ }
+ ret = check_mounted(file);
+ if (ret < 0) {
+ error("cannot check mount status of %s: %s", file,
+ strerror(-ret));
+ return 1;
+ }
+ if (ret == 1) {
+ error("%s is mounted", file);
+ return 1;
+ }
+ /* check if the device is busy */
+ fd = open(file, O_RDWR|O_EXCL);
+ if (fd < 0) {
+ error("unable to open %s: %s", file, strerror(errno));
+ return 1;
+ }
+ if (fstat(fd, &st)) {
+ error("unable to stat %s: %s", file, strerror(errno));
+ close(fd);
+ return 1;
+ }
+ if (!S_ISBLK(st.st_mode)) {
+ error("%s is not a block device", file);
+ close(fd);
+ return 1;
+ }
+ close(fd);
+ return 0;
+}
+
+int btrfs_scan_devices(void)
+{
+ int fd = -1;
+ int ret;
+ u64 num_devices;
+ struct btrfs_fs_devices *tmp_devices;
+ blkid_dev_iterate iter = NULL;
+ blkid_dev dev = NULL;
+ blkid_cache cache = NULL;
+ char path[PATH_MAX];
+
+ if (btrfs_scan_done)
+ return 0;
+
+ if (blkid_get_cache(&cache, NULL) < 0) {
+ error("blkid cache get failed");
+ return 1;
+ }
+ blkid_probe_all(cache);
+ iter = blkid_dev_iterate_begin(cache);
+ blkid_dev_set_search(iter, "TYPE", "btrfs");
+ while (blkid_dev_next(iter, &dev) == 0) {
+ dev = blkid_verify(cache, dev);
+ if (!dev)
+ continue;
+ /* if we are here its definitely a btrfs disk*/
+ strncpy_null(path, blkid_dev_devname(dev));
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0) {
+ error("cannot open %s: %s", path, strerror(errno));
+ continue;
+ }
+ ret = btrfs_scan_one_device(fd, path, &tmp_devices,
+ &num_devices, BTRFS_SUPER_INFO_OFFSET,
+ SBREAD_DEFAULT);
+ if (ret) {
+ error("cannot scan %s: %s", path, strerror(-ret));
+ close (fd);
+ continue;
+ }
+
+ close(fd);
+ }
+ blkid_dev_iterate_end(iter);
+ blkid_put_cache(cache);
+
+ btrfs_scan_done = 1;
+
+ return 0;
+}
+
+int is_vol_small(const char *file)
+{
+ int fd = -1;
+ int e;
+ struct stat st;
+ u64 size;
+
+ fd = open(file, O_RDONLY);
+ if (fd < 0)
+ return -errno;
+ if (fstat(fd, &st) < 0) {
+ e = -errno;
+ close(fd);
+ return e;
+ }
+ size = btrfs_device_size(fd, &st);
+ if (size == 0) {
+ close(fd);
+ return -1;
+ }
+ if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
+ close(fd);
+ return 1;
+ } else {
+ close(fd);
+ return 0;
+ }
+}
+
+/*
+ * This reads a line from the stdin and only returns non-zero if the
+ * first whitespace delimited token is a case insensitive match with yes
+ * or y.
+ */
+int ask_user(const char *question)
+{
+ char buf[30] = {0,};
+ char *saveptr = NULL;
+ char *answer;
+
+ printf("%s [y/N]: ", question);
+
+ return fgets(buf, sizeof(buf) - 1, stdin) &&
+ (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
+ (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
+}
+
+/*
+ * return 0 if a btrfs mount point is found
+ * return 1 if a mount point is found but not btrfs
+ * return <0 if something goes wrong
+ */
+int find_mount_root(const char *path, char **mount_root)
+{
+ FILE *mnttab;
+ int fd;
+ struct mntent *ent;
+ int len;
+ int ret;
+ int not_btrfs = 1;
+ int longest_matchlen = 0;
+ char *longest_match = NULL;
+
+ fd = open(path, O_RDONLY | O_NOATIME);
+ if (fd < 0)
+ return -errno;
+ close(fd);
+
+ mnttab = setmntent("/proc/self/mounts", "r");
+ if (!mnttab)
+ return -errno;
+
+ while ((ent = getmntent(mnttab))) {
+ len = strlen(ent->mnt_dir);
+ if (strncmp(ent->mnt_dir, path, len) == 0) {
+ /* match found and use the latest match */
+ if (longest_matchlen <= len) {
+ free(longest_match);
+ longest_matchlen = len;
+ longest_match = strdup(ent->mnt_dir);
+ not_btrfs = strcmp(ent->mnt_type, "btrfs");
+ }
+ }
+ }
+ endmntent(mnttab);
+
+ if (!longest_match)
+ return -ENOENT;
+ if (not_btrfs) {
+ free(longest_match);
+ return 1;
+ }
+
+ ret = 0;
+ *mount_root = realpath(longest_match, NULL);
+ if (!*mount_root)
+ ret = -errno;
+
+ free(longest_match);
+ return ret;
+}
+
+int test_minimum_size(const char *file, u32 nodesize)
+{
+ int fd;
+ struct stat statbuf;
+
+ fd = open(file, O_RDONLY);
+ if (fd < 0)
+ return -errno;
+ if (stat(file, &statbuf) < 0) {
+ close(fd);
+ return -errno;
+ }
+ if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(nodesize)) {
+ close(fd);
+ return 1;
+ }
+ close(fd);
+ return 0;
+}
+
+
+/*
+ * Test if path is a directory
+ * Returns:
+ * 0 - path exists but it is not a directory
+ * 1 - path exists and it is a directory
+ * < 0 - error
+ */
+int test_isdir(const char *path)
+{
+ struct stat st;
+ int ret;
+
+ ret = stat(path, &st);
+ if (ret < 0)
+ return -errno;
+
+ return !!S_ISDIR(st.st_mode);
+}
+
+void units_set_mode(unsigned *units, unsigned mode)
+{
+ unsigned base = *units & UNITS_MODE_MASK;
+
+ *units = base | mode;
+}
+
+void units_set_base(unsigned *units, unsigned base)
+{
+ unsigned mode = *units & ~UNITS_MODE_MASK;
+
+ *units = base | mode;
+}
+
+int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
+{
+ int level;
+
+ for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
+ if (!path->nodes[level])
+ break;
+ if (path->slots[level] + 1 >=
+ btrfs_header_nritems(path->nodes[level]))
+ continue;
+ if (level == 0)
+ btrfs_item_key_to_cpu(path->nodes[level], key,
+ path->slots[level] + 1);
+ else
+ btrfs_node_key_to_cpu(path->nodes[level], key,
+ path->slots[level] + 1);
+ return 0;
+ }
+ return 1;
+}
+
+const char* btrfs_group_type_str(u64 flag)
+{
+ u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
+ BTRFS_SPACE_INFO_GLOBAL_RSV;
+
+ switch (flag & mask) {
+ case BTRFS_BLOCK_GROUP_DATA:
+ return "Data";
+ case BTRFS_BLOCK_GROUP_SYSTEM:
+ return "System";
+ case BTRFS_BLOCK_GROUP_METADATA:
+ return "Metadata";
+ case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
+ return "Data+Metadata";
+ case BTRFS_SPACE_INFO_GLOBAL_RSV:
+ return "GlobalReserve";
+ default:
+ return "unknown";
+ }
+}
+
+const char* btrfs_group_profile_str(u64 flag)
+{
+ switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
+ case 0:
+ return "single";
+ case BTRFS_BLOCK_GROUP_RAID0:
+ return "RAID0";
+ case BTRFS_BLOCK_GROUP_RAID1:
+ return "RAID1";
+ case BTRFS_BLOCK_GROUP_RAID5:
+ return "RAID5";
+ case BTRFS_BLOCK_GROUP_RAID6:
+ return "RAID6";
+ case BTRFS_BLOCK_GROUP_DUP:
+ return "DUP";
+ case BTRFS_BLOCK_GROUP_RAID10:
+ return "RAID10";
+ default:
+ return "unknown";
+ }
+}
+
+u64 disk_size(const char *path)
+{
+ struct statfs sfs;
+
+ if (statfs(path, &sfs) < 0)
+ return 0;
+ else
+ return sfs.f_bsize * sfs.f_blocks;
+}
+
+u64 get_partition_size(const char *dev)
+{
+ u64 result;
+ int fd = open(dev, O_RDONLY);
+
+ if (fd < 0)
+ return 0;
+ if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
+ close(fd);
+ return 0;
}
+ close(fd);
- if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
- snprintf(estr, sz,
- "dup for data is allowed only in mixed mode");
- return 1;
- }
- return 0;
+ return result;
}
-/* Check if disk is suitable for btrfs
- * returns:
- * 1: something is wrong, estr provides the error
- * 0: all is fine
+/*
+ * Check if the BTRFS_IOC_TREE_SEARCH_V2 ioctl is supported on a given
+ * filesystem, opened at fd
*/
-int test_dev_for_mkfs(char *file, int force_overwrite, char *estr)
+int btrfs_tree_search2_ioctl_supported(int fd)
{
- int ret, fd;
- size_t sz = 100;
- struct stat st;
+ struct btrfs_ioctl_search_args_v2 *args2;
+ struct btrfs_ioctl_search_key *sk;
+ int args2_size = 1024;
+ char args2_buf[args2_size];
+ int ret;
- ret = is_swap_device(file);
- if (ret < 0) {
- snprintf(estr, sz, "error checking %s status: %s\n", file,
- strerror(-ret));
- return 1;
- }
- if (ret == 1) {
- snprintf(estr, sz, "%s is a swap device\n", file);
- return 1;
- }
- if (!force_overwrite) {
- if (check_overwrite(file)) {
- snprintf(estr, sz, "Use the -f option to force overwrite.\n");
- return 1;
- }
- }
- ret = check_mounted(file);
- if (ret < 0) {
- snprintf(estr, sz, "error checking %s mount status\n",
- file);
- return 1;
- }
- if (ret == 1) {
- snprintf(estr, sz, "%s is mounted\n", file);
- return 1;
- }
- /* check if the device is busy */
- fd = open(file, O_RDWR|O_EXCL);
- if (fd < 0) {
- snprintf(estr, sz, "unable to open %s: %s\n", file,
- strerror(errno));
- return 1;
- }
- if (fstat(fd, &st)) {
- snprintf(estr, sz, "unable to stat %s: %s\n", file,
- strerror(errno));
- return 1;
- }
- if (!S_ISBLK(st.st_mode)) {
- fprintf(stderr, "'%s' is not a block device\n", file);
+ args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
+ sk = &(args2->key);
+
+ /*
+ * Search for the extent tree item in the root tree.
+ */
+ sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
+ sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
+ sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
+ sk->min_type = BTRFS_ROOT_ITEM_KEY;
+ sk->max_type = BTRFS_ROOT_ITEM_KEY;
+ sk->min_offset = 0;
+ sk->max_offset = (u64)-1;
+ sk->min_transid = 0;
+ sk->max_transid = (u64)-1;
+ sk->nr_items = 1;
+ args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
+ ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
+ if (ret == -EOPNOTSUPP)
+ return 0;
+ else if (ret == 0)
return 1;
+ return ret;
+}
+
+int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features)
+{
+ if (nodesize < sectorsize) {
+ error("illegal nodesize %u (smaller than %u)",
+ nodesize, sectorsize);
+ return -1;
+ } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
+ error("illegal nodesize %u (larger than %u)",
+ nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
+ return -1;
+ } else if (nodesize & (sectorsize - 1)) {
+ error("illegal nodesize %u (not aligned to %u)",
+ nodesize, sectorsize);
+ return -1;
+ } else if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS &&
+ nodesize != sectorsize) {
+ error("illegal nodesize %u (not equal to %u for mixed block group)",
+ nodesize, sectorsize);
+ return -1;
}
- close(fd);
return 0;
}
-int test_skip_this_disk(char *path)
+/*
+ * Copy a path argument from SRC to DEST and check the SRC length if it's at
+ * most PATH_MAX and fits into DEST. DESTLEN is supposed to be exact size of
+ * the buffer.
+ * The destination buffer is zero terminated.
+ * Return < 0 for error, 0 otherwise.
+ */
+int arg_copy_path(char *dest, const char *src, int destlen)
{
- int fd;
+ size_t len = strlen(src);
+
+ if (len >= PATH_MAX || len >= destlen)
+ return -ENAMETOOLONG;
+
+ __strncpy_null(dest, src, destlen);
- /*
- * this will eliminate disks which are mounted (btrfs)
- * and non-dm disk path when dm is enabled
- */
- fd = open(path, O_RDWR|O_EXCL);
- if (fd < 0)
- return 1;
- close(fd);
return 0;
}
-int btrfs_scan_lblkid(int update_kernel)
+unsigned int get_unit_mode_from_arg(int *argc, char *argv[], int df_mode)
{
- int fd = -1;
- u64 num_devices;
- struct btrfs_fs_devices *tmp_devices;
- blkid_dev_iterate iter = NULL;
- blkid_dev dev = NULL;
- blkid_cache cache = NULL;
- char path[PATH_MAX];
+ unsigned int unit_mode = UNITS_DEFAULT;
+ int arg_i;
+ int arg_end;
- if (blkid_get_cache(&cache, 0) < 0) {
- printf("ERROR: lblkid cache get failed\n");
- return 1;
- }
- blkid_probe_all(cache);
- iter = blkid_dev_iterate_begin(cache);
- blkid_dev_set_search(iter, "TYPE", "btrfs");
- while (blkid_dev_next(iter, &dev) == 0) {
- dev = blkid_verify(cache, dev);
- if (!dev)
+ for (arg_i = 0; arg_i < *argc; arg_i++) {
+ if (!strcmp(argv[arg_i], "--"))
+ break;
+
+ if (!strcmp(argv[arg_i], "--raw")) {
+ unit_mode = UNITS_RAW;
+ argv[arg_i] = NULL;
continue;
- /* if we are here its definitly a btrfs disk*/
- strcpy(path, blkid_dev_devname(dev));
- if (test_skip_this_disk(path))
+ }
+ if (!strcmp(argv[arg_i], "--human-readable")) {
+ unit_mode = UNITS_HUMAN_BINARY;
+ argv[arg_i] = NULL;
continue;
+ }
- fd = open(path, O_RDONLY);
- btrfs_scan_one_device(fd, path, &tmp_devices,
- &num_devices, BTRFS_SUPER_INFO_OFFSET);
- close(fd);
- if (update_kernel)
- btrfs_register_one_device(path);
+ if (!strcmp(argv[arg_i], "--iec")) {
+ units_set_mode(&unit_mode, UNITS_BINARY);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "--si")) {
+ units_set_mode(&unit_mode, UNITS_DECIMAL);
+ argv[arg_i] = NULL;
+ continue;
+ }
+
+ if (!strcmp(argv[arg_i], "--kbytes")) {
+ units_set_base(&unit_mode, UNITS_KBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "--mbytes")) {
+ units_set_base(&unit_mode, UNITS_MBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "--gbytes")) {
+ units_set_base(&unit_mode, UNITS_GBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "--tbytes")) {
+ units_set_base(&unit_mode, UNITS_TBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+
+ if (!df_mode)
+ continue;
+
+ if (!strcmp(argv[arg_i], "-b")) {
+ unit_mode = UNITS_RAW;
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-h")) {
+ unit_mode = UNITS_HUMAN_BINARY;
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-H")) {
+ unit_mode = UNITS_HUMAN_DECIMAL;
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-k")) {
+ units_set_base(&unit_mode, UNITS_KBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-m")) {
+ units_set_base(&unit_mode, UNITS_MBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-g")) {
+ units_set_base(&unit_mode, UNITS_GBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
+ if (!strcmp(argv[arg_i], "-t")) {
+ units_set_base(&unit_mode, UNITS_TBYTES);
+ argv[arg_i] = NULL;
+ continue;
+ }
}
- blkid_dev_iterate_end(iter);
- return 0;
+
+ for (arg_i = 0, arg_end = 0; arg_i < *argc; arg_i++) {
+ if (!argv[arg_i])
+ continue;
+ argv[arg_end] = argv[arg_i];
+ arg_end++;
+ }
+
+ *argc = arg_end;
+
+ return unit_mode;
+}
+
+int string_is_numerical(const char *str)
+{
+ if (!str)
+ return 0;
+ if (!(*str >= '0' && *str <= '9'))
+ return 0;
+ while (*str >= '0' && *str <= '9')
+ str++;
+ if (*str != '\0')
+ return 0;
+ return 1;
}
/*
- * scans devs for the btrfs
-*/
-int scan_for_btrfs(int where, int update_kernel)
+ * Preprocess @argv with getopt_long to reorder options and consume the "--"
+ * option separator.
+ * Unknown short and long options are reported, optionally the @usage is printed
+ * before exit.
+ */
+void clean_args_no_options(int argc, char *argv[], const char * const *usagestr)
{
- int ret = 0;
+ static const struct option long_options[] = {
+ {NULL, 0, NULL, 0}
+ };
- switch (where) {
- case BTRFS_SCAN_PROC:
- ret = btrfs_scan_block_devices(update_kernel);
- break;
- case BTRFS_SCAN_DEV:
- ret = btrfs_scan_one_dir("/dev", update_kernel);
- break;
- case BTRFS_SCAN_LBLKID:
- ret = btrfs_scan_lblkid(update_kernel);
- break;
+ while (1) {
+ int c = getopt_long(argc, argv, "", long_options, NULL);
+
+ if (c < 0)
+ break;
+
+ switch (c) {
+ default:
+ if (usagestr)
+ usage(usagestr);
+ }
}
- return ret;
}
-int is_vol_small(char *file)
+/*
+ * Same as clean_args_no_options but pass through arguments that could look
+ * like short options. Eg. reisze which takes a negative resize argument like
+ * '-123M' .
+ *
+ * This accepts only two forms:
+ * - "-- option1 option2 ..."
+ * - "option1 option2 ..."
+ */
+void clean_args_no_options_relaxed(int argc, char *argv[], const char * const *usagestr)
{
- int fd = -1;
- int e;
- struct stat st;
- u64 size;
+ if (argc <= 1)
+ return;
- fd = open(file, O_RDONLY);
- if (fd < 0)
- return -errno;
- if (fstat(fd, &st) < 0) {
- e = -errno;
- close(fd);
- return e;
- }
- size = btrfs_device_size(fd, &st);
- if (size == 0) {
- close(fd);
- return -1;
- }
- if (size < 1024 * 1024 * 1024) {
- close(fd);
- return 1;
- } else {
- close(fd);
- return 0;
- }
+ if (strcmp(argv[1], "--") == 0)
+ optind = 2;
}
+/* Subvolume helper functions */
/*
- * This reads a line from the stdin and only returns non-zero if the
- * first whitespace delimited token is a case insensitive match with yes
- * or y.
+ * test if name is a correct subvolume name
+ * this function return
+ * 0-> name is not a correct subvolume name
+ * 1-> name is a correct subvolume name
*/
-int ask_user(char *question)
+int test_issubvolname(const char *name)
{
- char buf[30] = {0,};
- char *saveptr = NULL;
- char *answer;
+ return name[0] != '\0' && !strchr(name, '/') &&
+ strcmp(name, ".") && strcmp(name, "..");
+}
- printf("%s [y/N]: ", question);
+/*
+ * Test if path is a subvolume
+ * Returns:
+ * 0 - path exists but it is not a subvolume
+ * 1 - path exists and it is a subvolume
+ * < 0 - error
+ */
+int test_issubvolume(const char *path)
+{
+ struct stat st;
+ struct statfs stfs;
+ int res;
- return fgets(buf, sizeof(buf) - 1, stdin) &&
- (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
- (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
+ res = stat(path, &st);
+ if (res < 0)
+ return -errno;
+
+ if (st.st_ino != BTRFS_FIRST_FREE_OBJECTID || !S_ISDIR(st.st_mode))
+ return 0;
+
+ res = statfs(path, &stfs);
+ if (res < 0)
+ return -errno;
+
+ return (int)stfs.f_type == BTRFS_SUPER_MAGIC;
+}
+
+const char *subvol_strip_mountpoint(const char *mnt, const char *full_path)
+{
+ int len = strlen(mnt);
+ if (!len)
+ return full_path;
+
+ if (mnt[len - 1] != '/')
+ len += 1;
+
+ return full_path + len;
}
/*
- * For a given:
- * - file or directory return the containing tree root id
- * - subvolume return it's own tree id
- * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
- * undefined and function returns -1
+ * Returns
+ * <0: Std error
+ * 0: All fine
+ * 1: Error; and error info printed to the terminal. Fixme.
+ * 2: If the fullpath is root tree instead of subvol tree
*/
-int lookup_ino_rootid(int fd, u64 *rootid)
+int get_subvol_info(const char *fullpath, struct root_info *get_ri)
{
- struct btrfs_ioctl_ino_lookup_args args;
- int ret;
- int e;
+ u64 sv_id;
+ int ret = 1;
+ int fd = -1;
+ int mntfd = -1;
+ char *mnt = NULL;
+ const char *svpath = NULL;
+ DIR *dirstream1 = NULL;
+ DIR *dirstream2 = NULL;
- memset(&args, 0, sizeof(args));
- args.treeid = 0;
- args.objectid = BTRFS_FIRST_FREE_OBJECTID;
+ ret = test_issubvolume(fullpath);
+ if (ret < 0)
+ return ret;
+ if (!ret) {
+ error("not a subvolume: %s", fullpath);
+ return 1;
+ }
- ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
- e = errno;
- if (ret) {
- fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
- strerror(e));
+ ret = find_mount_root(fullpath, &mnt);
+ if (ret < 0)
return ret;
+ if (ret > 0) {
+ error("%s doesn't belong to btrfs mount point", fullpath);
+ return 1;
}
+ ret = 1;
+ svpath = subvol_strip_mountpoint(mnt, fullpath);
- *rootid = args.treeid;
+ fd = btrfs_open_dir(fullpath, &dirstream1, 1);
+ if (fd < 0)
+ goto out;
- return 0;
+ ret = btrfs_list_get_path_rootid(fd, &sv_id);
+ if (ret)
+ goto out;
+
+ mntfd = btrfs_open_dir(mnt, &dirstream2, 1);
+ if (mntfd < 0)
+ goto out;
+
+ memset(get_ri, 0, sizeof(*get_ri));
+ get_ri->root_id = sv_id;
+
+ if (sv_id == BTRFS_FS_TREE_OBJECTID)
+ ret = btrfs_get_toplevel_subvol(mntfd, get_ri);
+ else
+ ret = btrfs_get_subvol(mntfd, get_ri);
+ if (ret)
+ error("can't find '%s': %d", svpath, ret);
+
+out:
+ close_file_or_dir(mntfd, dirstream2);
+ close_file_or_dir(fd, dirstream1);
+ free(mnt);
+
+ return ret;
+}
+
+void init_rand_seed(u64 seed)
+{
+ int i;
+
+ /* only use the last 48 bits */
+ for (i = 0; i < 3; i++) {
+ rand_seed[i] = (unsigned short)(seed ^ (unsigned short)(-1));
+ seed >>= 16;
+ }
+ rand_seed_initlized = 1;
+}
+
+static void __init_seed(void)
+{
+ struct timeval tv;
+ int ret;
+ int fd;
+
+ if(rand_seed_initlized)
+ return;
+ /* Use urandom as primary seed source. */
+ fd = open("/dev/urandom", O_RDONLY);
+ if (fd >= 0) {
+ ret = read(fd, rand_seed, sizeof(rand_seed));
+ close(fd);
+ if (ret < sizeof(rand_seed))
+ goto fallback;
+ } else {
+fallback:
+ /* Use time and pid as fallback seed */
+ warning("failed to read /dev/urandom, use time and pid as random seed");
+ gettimeofday(&tv, 0);
+ rand_seed[0] = getpid() ^ (tv.tv_sec & 0xFFFF);
+ rand_seed[1] = getppid() ^ (tv.tv_usec & 0xFFFF);
+ rand_seed[2] = (tv.tv_sec ^ tv.tv_usec) >> 16;
+ }
+ rand_seed_initlized = 1;
+}
+
+u32 rand_u32(void)
+{
+ __init_seed();
+ /*
+ * Don't use nrand48, its range is [0,2^31) The highest bit will alwasy
+ * be 0. Use jrand48 to include the highest bit.
+ */
+ return (u32)jrand48(rand_seed);
+}
+
+unsigned int rand_range(unsigned int upper)
+{
+ __init_seed();
+ /*
+ * Use the full 48bits to mod, which would be more uniformly
+ * distributed
+ */
+ return (unsigned int)(jrand48(rand_seed) % upper);
}