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| author | Christian Brauner <christian.brauner@ubuntu.com> | 2021-07-27 12:48:40 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2021-08-23 13:19:12 +0200 |
| commit | c2fd68b6b2b00f0a6280b5971028c10c8f0ba70f (patch) | |
| tree | cbef11f6d08b6e74c4b85b0ebf026b2dc96edde8 /include/linux/namei.h | |
| parent | e7849e33cf5d785568b181e3c15236e32c7dfdb2 (diff) | |
| download | linux-stable-c2fd68b6b2b00f0a6280b5971028c10c8f0ba70f.tar.gz linux-stable-c2fd68b6b2b00f0a6280b5971028c10c8f0ba70f.tar.bz2 linux-stable-c2fd68b6b2b00f0a6280b5971028c10c8f0ba70f.zip | |
namei: add mapping aware lookup helper
Various filesystems rely on the lookup_one_len() helper to lookup a
single path component relative to a well-known starting point. Allow
such filesystems to support idmapped mounts by adding a version of this
helper to take the idmap into account when calling inode_permission().
This change is a required to let btrfs (and other filesystems) support
idmapped mounts.
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: linux-fsdevel@vger.kernel.org
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'include/linux/namei.h')
| -rw-r--r-- | include/linux/namei.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/namei.h b/include/linux/namei.h index be9a2b349ca7..e89329bb3134 100644 --- a/include/linux/namei.h +++ b/include/linux/namei.h @@ -68,6 +68,7 @@ extern struct dentry *try_lookup_one_len(const char *, struct dentry *, int); extern struct dentry *lookup_one_len(const char *, struct dentry *, int); extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int); extern struct dentry *lookup_positive_unlocked(const char *, struct dentry *, int); +struct dentry *lookup_one(struct user_namespace *, const char *, struct dentry *, int); extern int follow_down_one(struct path *); extern int follow_down(struct path *); |