ANDROID: sdcardfs: Add option to drop unused dentries
This adds the nocache mount option, which will cause sdcardfs to always
drop dentries that are not in use, preventing cached entries from
holding on to lower dentries, which could cause strange behavior when
bypassing the sdcardfs layer and directly changing the lower fs.
Change-Id: I70268584a20b989ae8cfdd278a2e4fa1605217fb
Signed-off-by: Daniel Rosenberg <drosen@google.com>
diff --git a/fs/sdcardfs/dentry.c b/fs/sdcardfs/dentry.c
index 776d549..cb573f1 100644
--- a/fs/sdcardfs/dentry.c
+++ b/fs/sdcardfs/dentry.c
@@ -123,6 +123,12 @@
return err;
}
+/* 1 = delete, 0 = cache */
+static int sdcardfs_d_delete(const struct dentry *d)
+{
+ return SDCARDFS_SB(d->d_sb)->options.nocache ? 1 : 0;
+}
+
static void sdcardfs_d_release(struct dentry *dentry)
{
if (!dentry || !dentry->d_fsdata)
@@ -181,6 +187,7 @@
const struct dentry_operations sdcardfs_ci_dops = {
.d_revalidate = sdcardfs_d_revalidate,
+ .d_delete = sdcardfs_d_delete,
.d_release = sdcardfs_d_release,
.d_hash = sdcardfs_hash_ci,
.d_compare = sdcardfs_cmp_ci,