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authorIan Kent <raven@themaw.net>2007-02-20 13:58:10 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-20 17:10:15 -0800
commitf50b6f8691cae2e0064c499dd3ef3f31142987f0 (patch)
tree56c449af977772a42939afde5230c4809a057ffe /fs/autofs4/autofs_i.h
parente8514478f63b95548a49576ba96b47edeb8596e0 (diff)
downloadlinux-linaro-f50b6f8691cae2e0064c499dd3ef3f31142987f0.tar.gz
[PATCH] autofs4: fix another race between mount and expire
Jeff Moyer has identified a race between mount and expire. What happens is that during an expire the situation can arise that a directory is removed and another lookup is done before the expire issues a completion status to the kernel module. In this case, since the the lookup gets a new dentry, it doesn't know that there is an expire in progress and when it posts its mount request, matches the existing expire request and waits for its completion. ENOENT is then returned to user space from lookup (as the dentry passed in is now unhashed) without having performed the mount request. The solution used here is to keep track of dentrys in this unhashed state and reuse them, if possible, in order to preserve the flags. Additionally, this infrastructure will provide the framework for the reintroduction of caching of mount fails removed earlier in development. Signed-off-by: Ian Kent <raven@themaw.net> Acked-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/autofs4/autofs_i.h')
-rw-r--r--fs/autofs4/autofs_i.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index 6b4cec3f272..d85f42fa920 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -52,6 +52,8 @@ struct autofs_info {
int flags;
+ struct list_head rehash;
+
struct autofs_sb_info *sbi;
unsigned long last_used;
atomic_t count;
@@ -110,6 +112,8 @@ struct autofs_sb_info {
struct mutex wq_mutex;
spinlock_t fs_lock;
struct autofs_wait_queue *queues; /* Wait queue pointer */
+ spinlock_t rehash_lock;
+ struct list_head rehash_list;
};
static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)