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Btrfs: optimize the error handle of use_block_rsv()

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cc: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Miao Xie 2013-05-13 13:55:10 +00:00 committed by Josef Bacik
parent 7b61cd9224
commit b586b32374
1 changed files with 28 additions and 37 deletions
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65
fs/btrfs/extent-tree.c
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@ -6656,48 +6656,39 @@ use_block_rsv(struct btrfs_trans_handle *trans,
block_rsv = get_block_rsv(trans, root);
if (block_rsv->size == 0) {
ret = reserve_metadata_bytes(root, block_rsv, blocksize,
BTRFS_RESERVE_NO_FLUSH);
/*
* If we couldn't reserve metadata bytes try and use some from
* the global reserve.
*/
if (ret && block_rsv != global_rsv) {
ret = block_rsv_use_bytes(global_rsv, blocksize);
if (!ret)
return global_rsv;
return ERR_PTR(ret);
} else if (ret) {
return ERR_PTR(ret);
}
return block_rsv;
}
if (unlikely(block_rsv->size == 0))
goto try_reserve;
ret = block_rsv_use_bytes(block_rsv, blocksize);
if (!ret)
return block_rsv;
if (ret && !block_rsv->failfast) {
if (btrfs_test_opt(root, ENOSPC_DEBUG)) {
static DEFINE_RATELIMIT_STATE(_rs,
DEFAULT_RATELIMIT_INTERVAL * 10,
/*DEFAULT_RATELIMIT_BURST*/ 1);
if (__ratelimit(&_rs))
WARN(1, KERN_DEBUG
"btrfs: block rsv returned %d\n", ret);
}
ret = reserve_metadata_bytes(root, block_rsv, blocksize,
BTRFS_RESERVE_NO_FLUSH);
if (!ret) {
return block_rsv;
} else if (ret && block_rsv != global_rsv) {
ret = block_rsv_use_bytes(global_rsv, blocksize);
if (!ret)
return global_rsv;
}
}
return ERR_PTR(-ENOSPC);
if (block_rsv->failfast)
return ERR_PTR(ret);
if (btrfs_test_opt(root, ENOSPC_DEBUG)) {
static DEFINE_RATELIMIT_STATE(_rs,
DEFAULT_RATELIMIT_INTERVAL * 10,
/*DEFAULT_RATELIMIT_BURST*/ 1);
if (__ratelimit(&_rs))
WARN(1, KERN_DEBUG
"btrfs: block rsv returned %d\n", ret);
}
try_reserve:
ret = reserve_metadata_bytes(root, block_rsv, blocksize,
BTRFS_RESERVE_NO_FLUSH);
if (!ret)
return block_rsv;
/*
* If we couldn't reserve metadata bytes try and use some from
* the global reserve.
*/
if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL) {
ret = block_rsv_use_bytes(global_rsv, blocksize);
if (!ret)
return global_rsv;
}
return ERR_PTR(ret);
}
static void unuse_block_rsv(struct btrfs_fs_info *fs_info,