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| author | Ian Kent <raven@themaw.net> | 2005-05-01 08:59:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-01 08:59:17 -0700 |
| commit | 3a9720ce73c9247e5262922d65e90444ea75eb50 (patch) | |
| tree | c70bba916168232f530c00858e7e8a0c5bd82b38 /fs/autofs4/autofs_i.h | |
| parent | 4dcd00b18118d174c4b8d838c11f437f0af3c20c (diff) | |
| download | linux-stable-3a9720ce73c9247e5262922d65e90444ea75eb50.tar.gz linux-stable-3a9720ce73c9247e5262922d65e90444ea75eb50.tar.bz2 linux-stable-3a9720ce73c9247e5262922d65e90444ea75eb50.zip | |
[PATCH] autofs4: tree race fix
For tree mount maps, a call to chdir or chroot, to a directory above the
moint point directories at a certain time during the expire results in the
expire incorrectly thinking the tree is not busy. This patch adds a check
to see if the filesystem above the tree mount points is busy and also locks
the filesystem during the tree mount expire to prevent the race.
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/autofs4/autofs_i.h')
| -rw-r--r-- | fs/autofs4/autofs_i.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h index 978987735252..c7b2b8890188 100644 --- a/fs/autofs4/autofs_i.h +++ b/fs/autofs4/autofs_i.h @@ -102,6 +102,7 @@ struct autofs_sb_info { int needs_reghost; struct super_block *sb; struct semaphore wq_sem; + spinlock_t fs_lock; struct autofs_wait_queue *queues; /* Wait queue pointer */ }; @@ -127,9 +128,18 @@ static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) { static inline int autofs4_ispending(struct dentry *dentry) { struct autofs_info *inf = autofs4_dentry_ino(dentry); + int pending = 0; - return (dentry->d_flags & DCACHE_AUTOFS_PENDING) || - (inf != NULL && inf->flags & AUTOFS_INF_EXPIRING); + if (dentry->d_flags & DCACHE_AUTOFS_PENDING) + return 1; + + if (inf) { + spin_lock(&inf->sbi->fs_lock); + pending = inf->flags & AUTOFS_INF_EXPIRING; + spin_unlock(&inf->sbi->fs_lock); + } + + return pending; } static inline void autofs4_copy_atime(struct file *src, struct file *dst) |