Commit 33af5e32 authored by Eric Paris's avatar Eric Paris
Browse files

fsnotify: ignored_mask - excluding notification 



The ignored_mask is a new mask which is part of fsnotify marks.  A group's
should_send_event() function can use the ignored mask to determine that
certain events are not of interest.  In particular if a group registers a
mask including FS_OPEN on a vfsmount they could add FS_OPEN to the
ignored_mask for individual inodes and not send open events for those
inodes.

Signed-off-by: default avatarEric Paris <eparis@redhat.com>
parent 90b1e7a5

fs/notify/mark.c

+6 −0
Original line number Diff line number Diff line
@@ -190,6 +190,12 @@ void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask) 
		fsnotify_set_inode_mark_mask_locked(mark, mask);

}



void fsnotify_set_mark_ignored_mask_locked(struct fsnotify_mark *mark, __u32 mask)

{

	assert_spin_locked(&mark->lock);



	mark->ignored_mask = mask;

}



/*

 * Attach an initialized mark to a given group and fs object.

include/linux/fsnotify_backend.h

+3 −0
Original line number Diff line number Diff line
@@ -266,6 +266,7 @@ struct fsnotify_mark { 
		struct fsnotify_inode_mark i;

		struct fsnotify_vfsmount_mark m;

	};

	__u32 ignored_mask;		/* events types to ignore */

	struct list_head free_g_list;	/* tmp list used when freeing this mark */

#define FSNOTIFY_MARK_FLAG_INODE		0x01

#define FSNOTIFY_MARK_FLAG_VFSMOUNT		0x02
@@ -373,6 +374,8 @@ extern struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *gro 
extern struct fsnotify_mark *fsnotify_find_vfsmount_mark(struct fsnotify_group *group, struct vfsmount *mnt);

/* copy the values from old into new */

extern void fsnotify_duplicate_mark(struct fsnotify_mark *new, struct fsnotify_mark *old);

/* set the ignored_mask of a mark */

extern void fsnotify_set_mark_ignored_mask_locked(struct fsnotify_mark *mark, __u32 mask);

/* set the mask of a mark (might pin the object into memory */

extern void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask);

/* attach the mark to both the group and the inode */

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