diff options
| author | Ian Kent <raven@themaw.net> | 2019-01-03 15:27:33 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-01-04 13:13:46 -0800 |
| commit | 55f0d8205dc6399826332c21bc56626868cd453d (patch) | |
| tree | 9a15cf912445e21d9ad3fb87f087a89185313191 /fs/autofs/autofs_i.h | |
| parent | 7c8f71935a65a584c48cbe478aaffc52292d6e00 (diff) | |
autofs: improve ioctl sbi checks
Al Viro made some suggestions to improve the implementation of commit
0633da48f0 ("fix autofs_sbi() does not check super block type").
The check is unnecessary in all cases except for ioctl usage so placing
the check in the super block accessor function adds a small overhead to
the common case where it isn't needed.
So it's sufficient to do this in the ioctl code only.
Also the check in the ioctl code is needlessly complex.
[akpm@linux-foundation.org: declare autofs_fs_type in .h, not .c]
Link: http://lkml.kernel.org/r/154296970987.9889.1597442413573683096.stgit@pluto-themaw-net
Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/autofs/autofs_i.h')
| -rw-r--r-- | fs/autofs/autofs_i.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/autofs/autofs_i.h b/fs/autofs/autofs_i.h index 9f9cadbfbd7a..64f693d355ad 100644 --- a/fs/autofs/autofs_i.h +++ b/fs/autofs/autofs_i.h @@ -42,6 +42,8 @@ #endif #define pr_fmt(fmt) KBUILD_MODNAME ":pid:%d:%s: " fmt, current->pid, __func__ +extern struct file_system_type autofs_fs_type; + /* * Unified info structure. This is pointed to by both the dentry and * inode structures. Each file in the filesystem has an instance of this @@ -126,8 +128,7 @@ struct autofs_sb_info { static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb) { - return sb->s_magic != AUTOFS_SUPER_MAGIC ? - NULL : (struct autofs_sb_info *)(sb->s_fs_info); + return (struct autofs_sb_info *)(sb->s_fs_info); } static inline struct autofs_info *autofs_dentry_ino(struct dentry *dentry) |