xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge tag 'fsnotify_for_v5.2-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Browse Source 
Pull fsnotify fixes from Jan Kara:
 "Two fsnotify fixes"

* tag 'fsnotify_for_v5.2-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  fsnotify: fix unlink performance regression
  fsnotify: Clarify connector assignment in fsnotify_add_mark_list()
This commit is contained in:
Linus Torvalds
2019-05-13 15:08:16 -07:00
parent 29c079caf5 4d8e7055a4
commit d4c608115c
4 changed files with 50 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
fs/notify/fsnotify.c
View File

@@ -107,6 +107,47 @@ void fsnotify_sb_delete(struct super_block *sb)
fsnotify_clear_marks_by_sb(sb);
}
/*
* fsnotify_nameremove - a filename was removed from a directory
*
* This is mostly called under parent vfs inode lock so name and
* dentry->d_parent should be stable. However there are some corner cases where
* inode lock is not held. So to be on the safe side and be reselient to future
* callers and out of tree users of d_delete(), we do not assume that d_parent
* and d_name are stable and we use dget_parent() and
* take_dentry_name_snapshot() to grab stable references.
*/
void fsnotify_nameremove(struct dentry *dentry, int isdir)
{
struct dentry *parent;
struct name_snapshot name;
__u32 mask = FS_DELETE;
/* d_delete() of pseudo inode? (e.g. __ns_get_path() playing tricks) */
if (IS_ROOT(dentry))
return;
if (isdir)
mask |= FS_ISDIR;
parent = dget_parent(dentry);
/* Avoid unneeded take_dentry_name_snapshot() */
if (!(d_inode(parent)->i_fsnotify_mask & FS_DELETE) &&
!(dentry->d_sb->s_fsnotify_mask & FS_DELETE))
goto out_dput;
take_dentry_name_snapshot(&name, dentry);
fsnotify(d_inode(parent), mask, d_inode(dentry), FSNOTIFY_EVENT_INODE,
&name.name, 0);
release_dentry_name_snapshot(&name);
out_dput:
dput(parent);
}
EXPORT_SYMBOL(fsnotify_nameremove);
/*
* Given an inode, first check if we care what happens to our children. Inotify
* and dnotify both tell their parents about events. If we care about any event

5
fs/notify/mark.c
View File

@@ -619,6 +619,11 @@ restart:
/* mark should be the last entry. last is the current last entry */
hlist_add_behind_rcu(&mark->obj_list, &last->obj_list);
added:
/*
* Since connector is attached to object using cmpxchg() we are
* guaranteed that connector initialization is fully visible by anyone
* seeing mark->connector set.
*/
WRITE_ONCE(mark->connector, conn);
out_err:
spin_unlock(&conn->lock);