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| author | Miao Xie <miaox@cn.fujitsu.com> | 2014-09-03 21:35:39 +0800 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-09-17 13:38:40 -0700 |
| commit | fe48a5c00f3c8087fc0a447caee2b5f9f97cf238 (patch) | |
| tree | a8d47049a474f3954575fe322236f305868355a8 /fs/btrfs/volumes.c | |
| parent | 7cc8e58d53cd2295c3c1cee7b503bd1790ea4486 (diff) | |
| download | blackbird-op-linux-fe48a5c00f3c8087fc0a447caee2b5f9f97cf238.tar.gz blackbird-op-linux-fe48a5c00f3c8087fc0a447caee2b5f9f97cf238.zip | |
Btrfs: fix unprotected system chunk array insertion
We didn't protect the system chunk array when we added a new
system chunk into it, it would cause the array be corrupted
if someone remove/add some system chunk into array at the same
time. Fix it by chunk lock.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 41da102cdcc0..9f22398d465f 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4054,10 +4054,13 @@ static int btrfs_add_system_chunk(struct btrfs_root *root, u32 array_size; u8 *ptr; + lock_chunks(root); array_size = btrfs_super_sys_array_size(super_copy); if (array_size + item_size + sizeof(disk_key) - > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) + > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) { + unlock_chunks(root); return -EFBIG; + } ptr = super_copy->sys_chunk_array + array_size; btrfs_cpu_key_to_disk(&disk_key, key); @@ -4066,6 +4069,8 @@ static int btrfs_add_system_chunk(struct btrfs_root *root, memcpy(ptr, chunk, item_size); item_size += sizeof(disk_key); btrfs_set_super_sys_array_size(super_copy, array_size + item_size); + unlock_chunks(root); + return 0; } |
