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btrfs: export helpers for subvolume name/id resolution

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[ Upstream commit c0c907a47d ]

The functions will be used outside of export.c and super.c to allow
resolving subvolume name from a given id, eg. for subvolume deletion by
id ioctl.

Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ split from the next patch ]
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marcos Paulo de Souza
2020-02-21 14:56:12 +01:00
committed by Greg Kroah-Hartman
parent cdb3f8b6c5
commit ba33ed7e3d
4 changed files with 15 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
fs/btrfs/ctree.h
View File

@@ -3261,6 +3261,8 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
int btrfs_parse_options(struct btrfs_root *root, char *options,
unsigned long new_flags);
int btrfs_sync_fs(struct super_block *sb, int wait);
char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
u64 subvol_objectid);
static inline __printf(2, 3)
void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)

8
fs/btrfs/export.c
View File

@@ -55,9 +55,9 @@ static int btrfs_encode_fh(struct inode *inode, u32 *fh, int *max_len,
return type;
}
static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
u64 root_objectid, u32 generation,
int check_generation)
struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
u64 root_objectid, u32 generation,
int check_generation)
{
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_root *root;
@@ -150,7 +150,7 @@ static struct dentry *btrfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
return btrfs_get_dentry(sb, objectid, root_objectid, generation, 1);
}
static struct dentry *btrfs_get_parent(struct dentry *child)
struct dentry *btrfs_get_parent(struct dentry *child)
{
struct inode *dir = d_inode(child);
struct btrfs_root *root = BTRFS_I(dir)->root;

5
fs/btrfs/export.h
View File

@@ -16,4 +16,9 @@ struct btrfs_fid {
u64 parent_root_objectid;
} __attribute__ ((packed));
struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
u64 root_objectid, u32 generation,
int check_generation);
struct dentry *btrfs_get_parent(struct dentry *child);
#endif

8
fs/btrfs/super.c
View File

@@ -948,8 +948,8 @@ out:
return error;
}
static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
u64 subvol_objectid)
char *btrfs_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;
@@ -1430,8 +1430,8 @@ static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid,
goto out;
}
}
subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb),
subvol_objectid);
subvol_name = btrfs_get_subvol_name_from_objectid(
btrfs_sb(mnt->mnt_sb), subvol_objectid);
if (IS_ERR(subvol_name)) {
root = ERR_CAST(subvol_name);
subvol_name = NULL;