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[PATCH] autofs4: tree race fix

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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>
This commit is contained in:
Ian Kent
2005-05-01 08:59:17 -07:00
committed by Linus Torvalds
parent 4dcd00b181
commit 3a9720ce73
3 changed files with 27 additions and 4 deletions
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14
fs/autofs4/autofs_i.h
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@@ -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)