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fsnotify: optimize the case of no marks of any type

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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.

Link: https://lore.kernel.org/r/20210810151220.285179-5-amir73il@gmail.com
Reviewed-by: Matthew Bobrowski <repnop@google.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2021-08-10 18:12:20 +03:00 committed by Jan Kara
parent ec44610fe2
commit e43de7f086
1 changed files with 9 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

9
include/linux/fsnotify.h
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@ -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;