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| author | David Sterba <dsterba@suse.com> | 2015-11-10 18:53:56 +0100 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2016-01-07 15:20:54 +0100 |
| commit | a1ee736268448d74af25737568e383acb84c3c18 (patch) | |
| tree | 2216e2f064209ade5011543d89da9f3dfbb075c8 | |
| parent | 4fb72bf2e913ca3798afd9e226e2416918936e49 (diff) | |
| download | linux-btrfs-a1ee736268448d74af25737568e383acb84c3c18.tar.gz | |
btrfs: do an allocation earlier during snapshot creation
We can allocate pending_snapshot earlier and do not have to do cleanup
in case of failure.
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/ioctl.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 6e896415a73461..fa25091e10abca 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -655,22 +655,20 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir, if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) return -EINVAL; + pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); + if (!pending_snapshot) + return -ENOMEM; + atomic_inc(&root->will_be_snapshoted); smp_mb__after_atomic(); btrfs_wait_for_no_snapshoting_writes(root); ret = btrfs_start_delalloc_inodes(root, 0); if (ret) - goto out; + goto dec_and_free; btrfs_wait_ordered_extents(root, -1); - pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); - if (!pending_snapshot) { - ret = -ENOMEM; - goto out; - } - btrfs_init_block_rsv(&pending_snapshot->block_rsv, BTRFS_BLOCK_RSV_TEMP); /* @@ -686,7 +684,7 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir, &pending_snapshot->qgroup_reserved, false); if (ret) - goto free; + goto dec_and_free; pending_snapshot->dentry = dentry; pending_snapshot->root = root; @@ -737,11 +735,11 @@ fail: btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, &pending_snapshot->block_rsv, pending_snapshot->qgroup_reserved); -free: - kfree(pending_snapshot); -out: +dec_and_free: if (atomic_dec_and_test(&root->will_be_snapshoted)) wake_up_atomic_t(&root->will_be_snapshoted); + kfree(pending_snapshot); + return ret; } |