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authorMiklos Szeredi <mszeredi@suse.cz>2013-09-05 11:44:41 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2013-09-05 16:23:53 -0400
commit6497d160f6abf8d1082ff1a4efd841118cb1fddd (patch)
treefc03ca8342fbd7b441198028b9c29cff83533db3 /fs/sysfs
parent13caa9fb5b4ce040379523037a0ce4ef867ee0c0 (diff)
downloadlinux-6497d160f6abf8d1082ff1a4efd841118cb1fddd.tar.bz2
sysfs: use check_submounts_and_drop()
Do have_submounts(), shrink_dcache_parent() and d_drop() atomically. check_submounts_and_drop() can deal with negative dentries and non-directories as well. Non-directories can also be mounted on. And just like directories we don't want these to disappear with invalidation. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/sysfs')
-rw-r--r--fs/sysfs/dir.c20
1 files changed, 8 insertions, 12 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 99ec5b40e977..4d83cedb9fcb 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -297,7 +297,6 @@ static int sysfs_dentry_delete(const struct dentry *dentry)
static int sysfs_dentry_revalidate(struct dentry *dentry, unsigned int flags)
{
struct sysfs_dirent *sd;
- int is_dir;
int type;
if (flags & LOOKUP_RCU)
@@ -341,18 +340,15 @@ out_bad:
* is performed at its new name the dentry will be readded
* to the dcache hashes.
*/
- is_dir = (sysfs_type(sd) == SYSFS_DIR);
mutex_unlock(&sysfs_mutex);
- if (is_dir) {
- /* If we have submounts we must allow the vfs caches
- * to lie about the state of the filesystem to prevent
- * leaks and other nasty things.
- */
- if (have_submounts(dentry))
- goto out_valid;
- shrink_dcache_parent(dentry);
- }
- d_drop(dentry);
+
+ /* If we have submounts we must allow the vfs caches
+ * to lie about the state of the filesystem to prevent
+ * leaks and other nasty things.
+ */
+ if (check_submounts_and_drop(dentry) != 0)
+ goto out_valid;
+
return 0;
}