autofs4: eliminate d_unhashed in path walk checks
We unhash the dentry (in a subsequent patch) in ->d_revalidate() in order
to send mount requests to ->lookup(). But then we can not rely on
d_unhased() to give reliable results because it may be called at any time
by any code path. The d_unhashed() function is used by __simple_empty()
in the path walking callbacks but autofs mount point dentrys should have
no directories at all so a list_empty() on d_subdirs should be (and is)
sufficient.
Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Sage Weil <sage@newdream.net>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Andreas Dilger <adilger@sun.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Yehuda Saheh <yehuda@newdream.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 81700f4..b6530f3 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -133,7 +133,7 @@
* it.
*/
spin_lock(&dcache_lock);
- if (!d_mountpoint(dentry) && __simple_empty(dentry)) {
+ if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) {
spin_unlock(&dcache_lock);
return -ENOENT;
}
@@ -257,7 +257,7 @@
* mount it again.
*/
if (ino->flags & AUTOFS_INF_PENDING ||
- (!d_mountpoint(dentry) && __simple_empty(dentry))) {
+ (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs))) {
spin_unlock(&dcache_lock);
spin_unlock(&sbi->fs_lock);
@@ -340,8 +340,7 @@
/* Check for a non-mountpoint directory with no contents */
spin_lock(&dcache_lock);
if (S_ISDIR(dentry->d_inode->i_mode) &&
- !d_mountpoint(dentry) &&
- __simple_empty(dentry)) {
+ !d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) {
DPRINTK("dentry=%p %.*s, emptydir",
dentry, dentry->d_name.len, dentry->d_name.name);
spin_unlock(&dcache_lock);