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| author | Ian Kent <raven@themaw.net> | 2009-12-15 16:45:48 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-16 07:19:58 -0800 |
| commit | c42c7f7e698fa888abbd50eb9c8e328fff68914f (patch) | |
| tree | cdcc21d21cdf2f695cba0298db75c609060e87e6 /fs/autofs4 | |
| parent | 6510c9d8595adcee2b0dc86408bc432a8dd7d652 (diff) | |
| download | kernel-common-c42c7f7e698fa888abbd50eb9c8e328fff68914f.tar.gz kernel-common-c42c7f7e698fa888abbd50eb9c8e328fff68914f.tar.bz2 kernel-common-c42c7f7e698fa888abbd50eb9c8e328fff68914f.zip | |
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.c | 7 |
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); |