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authorIan Kent <raven@themaw.net>2009-12-16 03:45:48 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 18:19:58 +0300
commitc42c7f7e698fa888abbd50eb9c8e328fff68914f (patch)
treecdcc21d21cdf2f695cba0298db75c609060e87e6 /fs/autofs4
parent6510c9d8595adcee2b0dc86408bc432a8dd7d652 (diff)
downloadlinux-c42c7f7e698fa888abbd50eb9c8e328fff68914f.tar.xz
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>
Diffstat (limited to 'fs/autofs4')
-rw-r--r--fs/autofs4/root.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 81700f4a19da..b6530f321adb 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -133,7 +133,7 @@ static int autofs4_dir_open(struct inode *inode, struct file *file)
* 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 @@ static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
* 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 @@ static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd)
/* 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);