When a watch is added on a super block's root inode with
the FS_EVENT_ON_SB flag, the watched inode is intended
to report events on all inodes on the same super block.
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/notify/fsnotify.c | 2 +-
include/linux/fsnotify_backend.h | 19 ++++++++++++++++---
2 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 3ba0e4a..12d4479 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -297,7 +297,7 @@ static __init int fsnotify_init(void)
{
int ret;
- BUG_ON(hweight32(ALL_FSNOTIFY_EVENTS) != 23);
+ BUG_ON(hweight32(ALL_FSNOTIFY_EVENTS) != 24);
ret = init_srcu_struct(&fsnotify_mark_srcu);
if (ret)
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index b55c64d..b7992da 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -54,6 +54,13 @@
* dnotify and inotify. */
#define FS_EVENT_ON_CHILD 0x08000000
+/* This root inode cares about things that happen to inodes on same super block.
+ * Can only be set for fanotify.
+ * Overloads IN_ONLYDIR inotify open only flag */
+#define FS_EVENT_ON_SB 0x01000000
+
+#define FS_EVENT_ON_DESCENDANT (FS_EVENT_ON_CHILD | FS_EVENT_ON_SB)
+
/* This is a list of all events that may get sent to a parernt based on fs event
* happening to inodes inside that directory */
#define FS_EVENTS_POSS_ON_CHILD (FS_ACCESS | FS_MODIFY | FS_ATTRIB |\
@@ -61,6 +68,11 @@
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE |\
FS_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM)
+/* This is a list of all events that may get sent to the root inode based on fs
+ * event happening to inodes on the same super block */
+#define FS_EVENTS_POSS_ON_SB (FS_EVENTS_POSS_ON_CHILD |\
+ FS_DELETE_SELF | FS_MOVE_SELF)
+
#define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM)
@@ -70,9 +82,10 @@
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \
FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \
FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
- FS_OPEN_PERM | FS_ACCESS_PERM | FS_EXCL_UNLINK | \
- FS_ISDIR | FS_IN_ONESHOT | FS_DN_RENAME | \
- FS_DN_MULTISHOT | FS_EVENT_ON_CHILD)
+ FS_OPEN_PERM | FS_ACCESS_PERM | \
+ FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \
+ FS_DN_RENAME | FS_DN_MULTISHOT | \
+ FS_EVENT_ON_CHILD | FS_EVENT_ON_SB)
struct fsnotify_group;
struct fsnotify_event;
--
2.7.4
--
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