fsnotify: add super block object type
Add the infrastructure to attach a mark to a super_block struct
and detach all attached marks when super block is destroyed.
This is going to be used by fanotify backend to setup super block
marks.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c
index 86fcf58..25385e3 100644
--- a/fs/notify/fdinfo.c
+++ b/fs/notify/fdinfo.c
@@ -131,6 +131,11 @@
seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
+ } else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_SB) {
+ struct super_block *sb = fsnotify_conn_sb(mark->connector);
+
+ seq_printf(m, "fanotify sdev:%x mflags:%x mask:%x ignored_mask:%x\n",
+ sb->s_dev, mflags, mark->mask, mark->ignored_mask);
}
}
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index ababdbf..2971803d 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -48,7 +48,7 @@
* Called during unmount with no locks held, so needs to be safe against
* concurrent modifiers. We temporarily drop sb->s_inode_list_lock and CAN block.
*/
-void fsnotify_unmount_inodes(struct super_block *sb)
+static void fsnotify_unmount_inodes(struct super_block *sb)
{
struct inode *inode, *iput_inode = NULL;
@@ -98,6 +98,12 @@
iput(iput_inode);
}
+void fsnotify_sb_delete(struct super_block *sb)
+{
+ fsnotify_unmount_inodes(sb);
+ fsnotify_clear_marks_by_sb(sb);
+}
+
/*
* 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
diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h
index 7902653..5a00121 100644
--- a/fs/notify/fsnotify.h
+++ b/fs/notify/fsnotify.h
@@ -21,6 +21,12 @@
return container_of(conn->obj, struct mount, mnt_fsnotify_marks);
}
+static inline struct super_block *fsnotify_conn_sb(
+ struct fsnotify_mark_connector *conn)
+{
+ return container_of(conn->obj, struct super_block, s_fsnotify_marks);
+}
+
/* destroy all events sitting in this groups notification queue */
extern void fsnotify_flush_notify(struct fsnotify_group *group);
@@ -43,6 +49,11 @@
{
fsnotify_destroy_marks(&real_mount(mnt)->mnt_fsnotify_marks);
}
+/* run the list of all marks associated with sb and destroy them */
+static inline void fsnotify_clear_marks_by_sb(struct super_block *sb)
+{
+ fsnotify_destroy_marks(&sb->s_fsnotify_marks);
+}
/* Wait until all marks queued for destruction are destroyed */
extern void fsnotify_wait_marks_destroyed(void);
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 59cdb27..b5172cc 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -115,6 +115,8 @@
return &fsnotify_conn_inode(conn)->i_fsnotify_mask;
else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT)
return &fsnotify_conn_mount(conn)->mnt_fsnotify_mask;
+ else if (conn->type == FSNOTIFY_OBJ_TYPE_SB)
+ return &fsnotify_conn_sb(conn)->s_fsnotify_mask;
return NULL;
}
@@ -192,6 +194,8 @@
inode->i_fsnotify_mask = 0;
} else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
fsnotify_conn_mount(conn)->mnt_fsnotify_mask = 0;
+ } else if (conn->type == FSNOTIFY_OBJ_TYPE_SB) {
+ fsnotify_conn_sb(conn)->s_fsnotify_mask = 0;
}
rcu_assign_pointer(*(conn->obj), NULL);
diff --git a/fs/super.c b/fs/super.c
index f3a8c00..ca53a084 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -442,7 +442,7 @@
sync_filesystem(sb);
sb->s_flags &= ~SB_ACTIVE;
- fsnotify_unmount_inodes(sb);
+ fsnotify_sb_delete(sb);
cgroup_writeback_umount();
evict_inodes(sb);