diff options
Diffstat (limited to 'include/linux/fsnotify_backend.h')
| -rw-r--r-- | include/linux/fsnotify_backend.h | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index 152520635bd3..32104cfc27a5 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -49,8 +49,11 @@ #define FS_OPEN_EXEC_PERM 0x00040000 /* open/exec event in a permission hook */ #define FS_EXCL_UNLINK 0x04000000 /* do not send events if object is unlinked */ -/* This inode cares about things that happen to its children. Always set for - * dnotify and inotify. */ +/* + * Set on inode mark that cares about things that happen to its children. + * Always set for dnotify and inotify. + * Set on inode/sb/mount marks that care about parent/name info. + */ #define FS_EVENT_ON_CHILD 0x08000000 #define FS_DN_RENAME 0x10000000 /* file renamed */ @@ -72,14 +75,22 @@ FS_OPEN_EXEC_PERM) /* - * This is a list of all events that may get sent to a parent based on fs event - * happening to inodes inside that directory. + * This is a list of all events that may get sent to a parent that is watching + * with flag FS_EVENT_ON_CHILD based on fs event on a child of that directory. */ #define FS_EVENTS_POSS_ON_CHILD (ALL_FSNOTIFY_PERM_EVENTS | \ FS_ACCESS | FS_MODIFY | FS_ATTRIB | \ FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | \ FS_OPEN | FS_OPEN_EXEC) +/* + * This is a list of all events that may get sent with the parent inode as the + * @to_tell argument of fsnotify(). + * It may include events that can be sent to an inode/sb/mount mark, but cannot + * be sent to a parent watching children. + */ +#define FS_EVENTS_POSS_TO_PARENT (FS_EVENTS_POSS_ON_CHILD) + /* Events that can be reported to backends */ #define ALL_FSNOTIFY_EVENTS (ALL_FSNOTIFY_DIRENT_EVENTS | \ FS_EVENTS_POSS_ON_CHILD | \ @@ -397,6 +408,19 @@ extern void __fsnotify_vfsmount_delete(struct vfsmount *mnt); extern void fsnotify_sb_delete(struct super_block *sb); extern u32 fsnotify_get_cookie(void); +static inline __u32 fsnotify_parent_needed_mask(__u32 mask) +{ + /* FS_EVENT_ON_CHILD is set on marks that want parent/name info */ + if (!(mask & FS_EVENT_ON_CHILD)) + return 0; + /* + * This object might be watched by a mark that cares about parent/name + * info, does it care about the specific set of events that can be + * reported with parent/name info? + */ + return mask & FS_EVENTS_POSS_TO_PARENT; +} + static inline int fsnotify_inode_watches_children(struct inode *inode) { /* FS_EVENT_ON_CHILD is set if the inode may care */ |