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authorIan Kent <raven@themaw.net>2005-05-01 08:59:17 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 08:59:17 -0700
commit3a9720ce73c9247e5262922d65e90444ea75eb50 (patch)
treec70bba916168232f530c00858e7e8a0c5bd82b38 /fs/autofs4/autofs_i.h
parent4dcd00b18118d174c4b8d838c11f437f0af3c20c (diff)
downloadlinux-linaro-3a9720ce73c9247e5262922d65e90444ea75eb50.tar.gz
[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.h14
1 files changed, 12 insertions, 2 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index 97898773525..c7b2b889018 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)