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| author | Josef Bacik <josef@toxicpanda.com> | 2020-02-06 16:24:26 +0100 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-03-23 17:01:31 +0100 |
| commit | 5168489a079aacd5626156ce5f8ab77325bcde15 (patch) | |
| tree | e1512a8df8d1426c03fa999d1c0e5c3d989e2d89 /fs/btrfs/super.c | |
| parent | btrfs: hold a ref on the root in btrfs_ioctl_send (diff) | |
| download | linux-5168489a079aacd5626156ce5f8ab77325bcde15.tar.xz linux-5168489a079aacd5626156ce5f8ab77325bcde15.zip | |
btrfs: hold a ref on the root in get_subvol_name_from_objectid
We lookup the name of a subvol which means we'll cross into different
roots. Hold a ref while we're doing the look ups in the fs_root we're
searching.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to '')
| -rw-r--r-- | fs/btrfs/super.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index a2c2e71af122..2c459d29e099 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1028,7 +1028,7 @@ static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, u64 subvol_objectid) { struct btrfs_root *root = fs_info->tree_root; - struct btrfs_root *fs_root; + struct btrfs_root *fs_root = NULL; struct btrfs_root_ref *root_ref; struct btrfs_inode_ref *inode_ref; struct btrfs_key key; @@ -1099,6 +1099,12 @@ static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, fs_root = btrfs_get_fs_root(fs_info, &key, true); if (IS_ERR(fs_root)) { ret = PTR_ERR(fs_root); + fs_root = NULL; + goto err; + } + if (!btrfs_grab_fs_root(fs_root)) { + ret = -ENOENT; + fs_root = NULL; goto err; } @@ -1143,6 +1149,8 @@ static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, ptr[0] = '/'; btrfs_release_path(path); } + btrfs_put_fs_root(fs_root); + fs_root = NULL; } btrfs_free_path(path); @@ -1155,6 +1163,7 @@ static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, return name; err: + btrfs_put_fs_root(fs_root); btrfs_free_path(path); kfree(name); return ERR_PTR(ret); |