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Btrfs: fix unprotected system chunk array insertion

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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>
This commit is contained in:
Miao Xie 2014-09-03 21:35:39 +08:00 committed by Chris Mason
parent 7cc8e58d53
commit fe48a5c00f
1 changed files with 6 additions and 1 deletions
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7
fs/btrfs/volumes.c
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@ -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;
}