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authorIan Kent <raven@themaw.net>2006-03-27 01:14:44 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 08:44:39 -0800
commit2d753e62b87ab2fc72bb4ff5153791d32ff9c08e (patch)
treed10660a7ad08973679c3cfa66cd2b8eedae5afaa
parentf360ce3be466d50de153b001b24561ca7593042b (diff)
[PATCH] autofs4: can't mount due to mount point dir not empty
Addresse a problem where stale dentrys stop mounts from happening. When a mount point directory is pre-created and a non-existent entry within it is requested a dentry ends up being created within the mount point directory which stops future mounts. The problem is solved by ignoring negative, unhashed dentrys in the mount point d_subdirs list. Additionally the apparent cacheing of -ENOENT returns from requests is removed. The test on d_time is a tautology and d_time is not initialised and has an unexpected value. In short it doesn't do what it's meant to. The cacheing of failed requests to the daemon is important and will be followed up later. Signed-off-by: Ian Kent <raven@themaw.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/autofs4/autofs_i.h8
-rw-r--r--fs/autofs4/root.c9
2 files changed, 4 insertions, 13 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index f54c5b21f87..eea25934da6 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -41,14 +41,6 @@
#define AUTOFS_SUPER_MAGIC 0x0187
-/*
- * If the daemon returns a negative response (AUTOFS_IOC_FAIL) then the
- * kernel will keep the negative response cached for up to the time given
- * here, although the time can be shorter if the kernel throws the dcache
- * entry away. This probably should be settable from user space.
- */
-#define AUTOFS_NEGATIVE_TIMEOUT (60*HZ) /* 1 minute */
-
/* Unified info structure. This is pointed to by both the dentry and
inode structures. Each file in the filesystem has an instance of this
structure. It holds a reference to the dentry, so dentries are never
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index af9a4c6bbad..c7ff3577434 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -294,14 +294,13 @@ static int try_to_fill_dentry(struct vfsmount *mnt, struct dentry *dentry, int f
/* Turn this into a real negative dentry? */
if (status == -ENOENT) {
- dentry->d_time = jiffies + AUTOFS_NEGATIVE_TIMEOUT;
spin_lock(&dentry->d_lock);
dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
spin_unlock(&dentry->d_lock);
- return 1;
+ return 0;
} else if (status) {
/* Return a negative dentry, but leave it "pending" */
- return 1;
+ return 0;
}
/* Trigger mount for path component or follow link */
} else if (flags & (LOOKUP_CONTINUE | LOOKUP_DIRECTORY) ||
@@ -360,13 +359,13 @@ static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd)
/* Negative dentry.. invalidate if "old" */
if (dentry->d_inode == NULL)
- return (dentry->d_time - jiffies <= AUTOFS_NEGATIVE_TIMEOUT);
+ return 0;
/* Check for a non-mountpoint directory with no contents */
spin_lock(&dcache_lock);
if (S_ISDIR(dentry->d_inode->i_mode) &&
!d_mountpoint(dentry) &&
- list_empty(&dentry->d_subdirs)) {
+ simple_empty_nolock(dentry)) {
DPRINTK("dentry=%p %.*s, emptydir",
dentry, dentry->d_name.len, dentry->d_name.name);
spin_unlock(&dcache_lock);