Analogous to shrink_dcache_parent except that it collects inodes.
It is not very appropriate to be put in dcache.c, but d_walk can only
be invoked from here.
Signed-off-by: Li Wang <liwang@xxxxxxxxxxxxxxx>
Signed-off-by: Yunchuan Wen <yunchuanwen@xxxxxxxxxxxxxxx>
---
fs/dcache.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/fs/dcache.c b/fs/dcache.c
index 6055d61..0fc0f80 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1318,6 +1318,42 @@ void shrink_dcache_parent(struct dentry *parent)
}
EXPORT_SYMBOL(shrink_dcache_parent);
+static enum d_walk_ret gather_inode(void *data, struct dentry *dentry)
+{
+ struct list_head *list = data;
+ struct inode *inode = dentry->d_inode;
+
+ if ((inode == NULL) || ((!inode_owner_or_capable(inode)) &&
+ (!capable(CAP_SYS_ADMIN))))
+ goto out;
+ spin_lock(&inode->i_lock);
+ if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
+ (inode->i_mapping->nrpages == 0) ||
+ (!list_empty(&inode->i_lru))) {
+ goto out_unlock;
+ }
+ __iget(inode);
+ list_add_tail(&inode->i_lru, list);
+out_unlock:
+ spin_unlock(&inode->i_lock);
+out:
+ return D_WALK_CONTINUE;
+}
+
+void shrink_pagecache_parent(struct dentry *parent)
+{
+ LIST_HEAD(list);
+ struct inode *inode, *next;
+
+ d_walk(parent, &list, gather_inode, NULL);
+ list_for_each_entry_safe(inode, next, &list, i_lru) {
+ list_del_init(&inode->i_lru);
+ invalidate_mapping_pages(inode->i_mapping, 0, -1);
+ iput(inode);
+ }
+}
+EXPORT_SYMBOL(shrink_pagecache_parent);
+
static enum d_walk_ret umount_collect(void *_data, struct dentry *dentry)
{
struct select_data *data = _data;
--
1.7.9.5
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