Add a simple check in the inline helpers to avoid calling fsnotify()
and __fsnotify_parent() in case there are no marks of any type
(inode/sb/mount) for an inode's sb, so there can be no objects
of any type interested in the event.
Reviewed-by: Matthew Bobrowski <repnop@xxxxxxxxxx>
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
include/linux/fsnotify.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index f8acddcf54fb..12d3a7d308ab 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -30,6 +30,9 @@ static inline void fsnotify_name(struct inode *dir, __u32 mask,
struct inode *child,
const struct qstr *name, u32 cookie)
{
+ if (atomic_long_read(&dir->i_sb->s_fsnotify_connectors) == 0)
+ return;
+
fsnotify(mask, child, FSNOTIFY_EVENT_INODE, dir, name, NULL, cookie);
}
@@ -41,6 +44,9 @@ static inline void fsnotify_dirent(struct inode *dir, struct dentry *dentry,
static inline void fsnotify_inode(struct inode *inode, __u32 mask)
{
+ if (atomic_long_read(&inode->i_sb->s_fsnotify_connectors) == 0)
+ return;
+
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
@@ -53,6 +59,9 @@ static inline int fsnotify_parent(struct dentry *dentry, __u32 mask,
{
struct inode *inode = d_inode(dentry);
+ if (atomic_long_read(&inode->i_sb->s_fsnotify_connectors) == 0)
+ return 0;
+
if (S_ISDIR(inode->i_mode)) {
mask |= FS_ISDIR;
--
2.32.0
