This is needed to drop lower objects early enough, under certain conditions,
so the lower objects don't stay behind until umount(). [LTP testing]
Signed-off-by: Erez Zadok <[email protected]>
---
fs/unionfs/dentry.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/fs/unionfs/dentry.c b/fs/unionfs/dentry.c
index 0e89308..0369d93 100644
--- a/fs/unionfs/dentry.c
+++ b/fs/unionfs/dentry.c
@@ -484,7 +484,49 @@ out:
return;
}
+/*
+ * Called when we're removing the last reference to our dentry. So we
+ * should drop all lower references too.
+ */
+static void unionfs_d_iput(struct dentry *dentry, struct inode *inode)
+{
+ int bindex, rc;
+
+ unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_CHILD);
+
+ if (dbstart(dentry) < 0)
+ goto drop_lower_inodes;
+ for (bindex = dbstart(dentry); bindex <= dbend(dentry); bindex++) {
+ if (unionfs_lower_mnt_idx(dentry, bindex)) {
+ unionfs_mntput(dentry, bindex);
+ unionfs_set_lower_mnt_idx(dentry, bindex, NULL);
+ }
+ if (unionfs_lower_dentry_idx(dentry, bindex)) {
+ dput(unionfs_lower_dentry_idx(dentry, bindex));
+ unionfs_set_lower_dentry_idx(dentry, bindex, NULL);
+ }
+ }
+ set_dbstart(dentry, -1);
+ set_dbend(dentry, -1);
+
+drop_lower_inodes:
+ rc = atomic_read(&inode->i_count);
+ if (rc == 1 && inode->i_nlink == 1 && ibstart(inode) >= 0) {
+ /* see Documentation/filesystems/unionfs/issues.txt */
+ lockdep_off();
+ iput(unionfs_lower_inode(inode));
+ lockdep_on();
+ unionfs_set_lower_inode(inode, NULL);
+ /* XXX: may need to set start/end to -1? */
+ }
+
+ iput(inode);
+
+ unionfs_read_unlock(dentry->d_sb);
+}
+
struct dentry_operations unionfs_dops = {
.d_revalidate = unionfs_d_revalidate,
.d_release = unionfs_d_release,
+ .d_iput = unionfs_d_iput,
};
--
1.5.2.2
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