fsnotify: allow ignored_mask to survive modification
Some inodes a group may want to never hear about a set of events even if
the inode is modified. We add a new mark flag which indicates that these
marks should not have their ignored_mask cleared on modification.
Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 3ad940d..54d58d5 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -148,7 +148,8 @@
if (!hlist_empty(&inode->i_fsnotify_marks)) {
spin_lock(&inode->i_lock);
hlist_for_each_entry(mark, node, &inode->i_fsnotify_marks, i.i_list) {
- mark->ignored_mask = 0;
+ if (!(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
+ mark->ignored_mask = 0;
}
spin_unlock(&inode->i_lock);
}
@@ -160,7 +161,8 @@
if (mnt && !hlist_empty(&mnt->mnt_fsnotify_marks)) {
spin_lock(&mnt->mnt_root->d_lock);
hlist_for_each_entry(mark, node, &mnt->mnt_fsnotify_marks, m.m_list) {
- mark->ignored_mask = 0;
+ if (!(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
+ mark->ignored_mask = 0;
}
spin_unlock(&mnt->mnt_root->d_lock);
}
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 018416e..8ca19df 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -271,6 +271,7 @@
#define FSNOTIFY_MARK_FLAG_INODE 0x01
#define FSNOTIFY_MARK_FLAG_VFSMOUNT 0x02
#define FSNOTIFY_MARK_FLAG_OBJECT_PINNED 0x04
+#define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x08
unsigned int flags; /* vfsmount or inode mark? */
void (*free_mark)(struct fsnotify_mark *mark); /* called on final put+free */
};