linux-kernel - [PATCH 2/7] fanotify: add an extra flag to mark_remove_from_mask that indicates wheather a mark could be destroyed

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Date:	Fri, 11 Feb 2011 11:36:38 +0100
From:	Lino Sanfilippo <LinoSanfilippo@....de>
To:	eparis@...hat.com
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Lino Sanfilippo <LinoSanfilippo@....de>
Subject: [PATCH 2/7] fanotify: add an extra flag to mark_remove_from_mask that indicates wheather a mark could be destroyed

This patch adds an extra flag to mark_remove_from_mask() to inform the caller if
all masks of a mark have been cleared and the mark could be destroyed.
With this we dont destroy the mark implicitly in the function itself any more
but let the caller handle it.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@....de>
---
 fs/notify/fanotify/fanotify_user.c |   20 +++++++++++++++-----
 1 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 2d4925b..848648f 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -516,7 +516,8 @@ out:
 
 static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
 					    __u32 mask,
-					    unsigned int flags)
+					    unsigned int flags,
+					    int *destroy)
 {
 	__u32 oldmask;
 	int destroy_mark;
@@ -532,8 +533,7 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
 	destroy_mark = (!fsn_mark->mask && !fsn_mark->ignored_mask);
 	spin_unlock(&fsn_mark->lock);
 
-	if (destroy_mark)
-		fsnotify_destroy_mark(fsn_mark);
+	*destroy = destroy_mark;
 
 	return mask & oldmask;
 }
@@ -544,6 +544,7 @@ static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
 {
 	struct fsnotify_mark *fsn_mark = NULL;
 	__u32 removed;
+	int destroy_mark;
 	int ret;
 
 	mutex_lock(&group->mutex);
@@ -552,7 +553,11 @@ static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
 	if (!fsn_mark)
 		goto err;
 
-	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags);
+	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
+						 &destroy_mark);
+	if (destroy_mark)
+		fsnotify_destroy_mark(fsn_mark);
+
 	fsnotify_put_mark(fsn_mark);
 	if (removed & mnt->mnt_fsnotify_mask)
 		fsnotify_recalc_vfsmount_mask(mnt);
@@ -569,6 +574,7 @@ static int fanotify_remove_inode_mark(struct fsnotify_group *group,
 {
 	struct fsnotify_mark *fsn_mark = NULL;
 	__u32 removed;
+	int destroy_mark;
 	int ret;
 
 	mutex_lock(&group->mutex);
@@ -577,7 +583,11 @@ static int fanotify_remove_inode_mark(struct fsnotify_group *group,
 	if (!fsn_mark)
 		goto err;
 
-	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags);
+	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
+						 &destroy_mark);
+	if (destroy_mark)
+		fsnotify_destroy_mark(fsn_mark);
+
 	/* matches the fsnotify_find_inode_mark() */
 	fsnotify_put_mark(fsn_mark);
 	if (removed & inode->i_fsnotify_mask)
-- 
1.5.6.5

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