--- fs/sdcardfs/dentry.c
+++ fs/sdcardfs/dentry.c
@@ -19,22 +19,74 @@
*/
static int sdcardfs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
- struct path lower_path, saved_path;
- struct dentry *lower_dentry;
+ struct path parent_lower_path, lower_path;
+ struct dentry *parent_dentry = NULL;
+ struct dentry *parent_lower_dentry = NULL;
+ struct dentry *lower_cur_parent_dentry = NULL;
+ struct dentry *lower_dentry = NULL;
int err = 1;
if (nd && nd->flags & LOOKUP_RCU)
return -ECHILD;
+ spin_lock(&dentry->d_lock);
+ if (IS_ROOT(dentry)) {
+ spin_unlock(&dentry->d_lock);
+ return 1;
+ }
+ spin_unlock(&dentry->d_lock);
+
+ parent_dentry = dget_parent(dentry);
+ sdcardfs_get_lower_path(parent_dentry, &parent_lower_path);
sdcardfs_get_lower_path(dentry, &lower_path);
+ parent_lower_dentry = parent_lower_path.dentry;
lower_dentry = lower_path.dentry;
- if (!lower_dentry->d_op || !lower_dentry->d_op->d_revalidate)
+ lower_cur_parent_dentry = dget_parent(lower_dentry);
+
+ spin_lock(&lower_dentry->d_lock);
+ if (d_unhashed(lower_dentry)) {
+ spin_unlock(&lower_dentry->d_lock);
+ d_drop(dentry);
+ err = 0;
goto out;
- pathcpy(&saved_path, &nd->path);
- pathcpy(&nd->path, &lower_path);
- err = lower_dentry->d_op->d_revalidate(lower_dentry, nd);
- pathcpy(&nd->path, &saved_path);
+ }
+ spin_unlock(&lower_dentry->d_lock);
+
+ if (parent_lower_dentry != lower_cur_parent_dentry) {
+ d_drop(dentry);
+ err = 0;
+ goto out;
+ }
+
+ if (dentry < lower_dentry) {
+ spin_lock(&dentry->d_lock);
+ spin_lock(&lower_dentry->d_lock);
+ } else {
+ spin_lock(&lower_dentry->d_lock);
+ spin_lock(&dentry->d_lock);
+ }
+
+ if (dentry->d_name.len != lower_dentry->d_name.len) {
+ __d_drop(dentry);
+ err = 0;
+ } else if (strncasecmp(dentry->d_name.name, lower_dentry->d_name.name,
+ dentry->d_name.len) != 0) {
+ __d_drop(dentry);
+ err = 0;
+ }
+
+ if (dentry < lower_dentry) {
+ spin_unlock(&lower_dentry->d_lock);
+ spin_unlock(&dentry->d_lock);
+ } else {
+ spin_unlock(&dentry->d_lock);
+ spin_unlock(&lower_dentry->d_lock);
+ }
+
out:
+ dput(parent_dentry);
+ dput(lower_cur_parent_dentry);
+ sdcardfs_put_lower_path(parent_dentry, &parent_lower_path);
sdcardfs_put_lower_path(dentry, &lower_path);
return err;
}
@@ -47,7 +99,7 @@ static void sdcardfs_d_release(struct de
return;
}
-#ifdef SDCARDFS_CASE_INSENSITIVE_MATCH_SUPPORT
+#ifdef CONFIG_SDCARD_FS_CI_SEARCH
static int sdcardfs_hash_ci(const struct dentry *dentry,
const struct inode *inode, struct qstr *qstr)
{
@@ -110,10 +162,10 @@ const struct dentry_operations sdcardfs_
.d_compare = sdcardfs_cmp_ci,
};
-#else /* SDCARDFS_CASE_INSENSITIVE_MATCH_SUPPORT */
+#else /* CONFIG_SDCARD_FS_CI_SEARCH */
const struct dentry_operations sdcardfs_dops = {
.d_revalidate = sdcardfs_d_revalidate,
.d_release = sdcardfs_d_release,
};
-#endif /* SDCARDFS_CASE_INSENSITIVE_MATCH_SUPPORT */
+#endif /* CONFIG_SDCARD_FS_CI_SEARCH */
projects / ziggy471-sgs4-jb.git / blobdiff