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authorJan Kara <jack@suse.cz>2017-03-14 14:48:00 +0100
committerJan Kara <jack@suse.cz>2017-04-10 17:37:35 +0200
commite911d8af87dba7642138f4320ca3db80629989f2 (patch)
treef6023831e4d1eae4e99bc4e389012ec70b897b45 /fs/notify
parent86ffe245c430f07f95d5d28d3b694ea72f4492e7 (diff)
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fsnotify: Make fsnotify_mark_connector hold inode reference
Currently inode reference is held by fsnotify marks. Change the rules so that inode reference is held by fsnotify_mark_connector structure whenever the list is non-empty. This simplifies the code and is more logical. Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify')
-rw-r--r--fs/notify/fsnotify.h4
-rw-r--r--fs/notify/inode_mark.c30
-rw-r--r--fs/notify/mark.c17
3 files changed, 12 insertions, 39 deletions
diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h
index dd1a6798c9cd..1a2aec65ebd8 100644
--- a/fs/notify/fsnotify.h
+++ b/fs/notify/fsnotify.h
@@ -21,8 +21,6 @@ extern u32 fsnotify_recalc_mask(struct fsnotify_mark_connector *conn);
extern int fsnotify_compare_groups(struct fsnotify_group *a,
struct fsnotify_group *b);
-extern void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *fsn_mark,
- __u32 mask);
/* Add mark to a proper place in mark list */
extern int fsnotify_add_mark_list(struct fsnotify_mark_connector **connp,
struct fsnotify_mark *mark,
@@ -40,7 +38,7 @@ extern int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
/* vfsmount specific destruction of a mark */
extern void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark);
/* inode specific destruction of a mark */
-extern void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark);
+extern struct inode *fsnotify_destroy_inode_mark(struct fsnotify_mark *mark);
/* Find mark belonging to given group in the list of marks */
extern struct fsnotify_mark *fsnotify_find_mark(
struct fsnotify_mark_connector *conn,
diff --git a/fs/notify/inode_mark.c b/fs/notify/inode_mark.c
index 1644ba09efd4..c3873b6920e7 100644
--- a/fs/notify/inode_mark.c
+++ b/fs/notify/inode_mark.c
@@ -43,9 +43,10 @@ void fsnotify_recalc_inode_mask(struct inode *inode)
__fsnotify_update_child_dentry_flags(inode);
}
-void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
+struct inode *fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
{
struct inode *inode = mark->connector->inode;
+ bool empty;
BUG_ON(!mutex_is_locked(&mark->group->mark_mutex));
assert_spin_locked(&mark->lock);
@@ -53,6 +54,7 @@ void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
spin_lock(&inode->i_lock);
hlist_del_init_rcu(&mark->obj_list);
+ empty = hlist_empty(&mark->connector->list);
mark->connector = NULL;
/*
@@ -62,6 +64,8 @@ void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
*/
inode->i_fsnotify_mask = fsnotify_recalc_mask(inode->i_fsnotify_marks);
spin_unlock(&inode->i_lock);
+
+ return empty ? inode : NULL;
}
/*
@@ -89,30 +93,6 @@ struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *group,
}
/*
- * If we are setting a mark mask on an inode mark we should pin the inode
- * in memory.
- */
-void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *mark,
- __u32 mask)
-{
- struct inode *inode;
-
- assert_spin_locked(&mark->lock);
-
- if (mask && mark->connector &&
- !(mark->flags & FSNOTIFY_MARK_FLAG_OBJECT_PINNED)) {
- mark->flags |= FSNOTIFY_MARK_FLAG_OBJECT_PINNED;
- inode = igrab(mark->connector->inode);
- /*
- * we shouldn't be able to get here if the inode wasn't
- * already safely held in memory. But bug in case it
- * ever is wrong.
- */
- BUG_ON(!inode);
- }
-}
-
-/*
* Attach an initialized mark to a given inode.
* These marks may be used for the fsnotify backend to determine which
* event types should be delivered to which group and for which inodes. These
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 3d6e7a8e58be..8a15c64fbe80 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -142,10 +142,9 @@ void fsnotify_detach_mark(struct fsnotify_mark *mark)
mark->flags &= ~FSNOTIFY_MARK_FLAG_ATTACHED;
- if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE) {
- inode = mark->connector->inode;
- fsnotify_destroy_inode_mark(mark);
- } else if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT)
+ if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE)
+ inode = fsnotify_destroy_inode_mark(mark);
+ else if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT)
fsnotify_destroy_vfsmount_mark(mark);
else
BUG();
@@ -160,7 +159,7 @@ void fsnotify_detach_mark(struct fsnotify_mark *mark)
spin_unlock(&mark->lock);
- if (inode && (mark->flags & FSNOTIFY_MARK_FLAG_OBJECT_PINNED))
+ if (inode)
iput(inode);
atomic_dec(&group->num_marks);
@@ -274,9 +273,6 @@ void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask)
assert_spin_locked(&mark->lock);
mark->mask = mask;
-
- if (mark->connector && mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE)
- fsnotify_set_inode_mark_mask_locked(mark, mask);
}
void fsnotify_set_mark_ignored_mask_locked(struct fsnotify_mark *mark, __u32 mask)
@@ -375,6 +371,8 @@ int fsnotify_add_mark_list(struct fsnotify_mark_connector **connp,
/* is mark the first mark? */
if (hlist_empty(&conn->list)) {
hlist_add_head_rcu(&mark->obj_list, &conn->list);
+ if (inode)
+ __iget(inode);
goto added;
}
@@ -441,9 +439,6 @@ int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
} else {
BUG();
}
-
- /* this will pin the object if appropriate */
- fsnotify_set_mark_mask_locked(mark, mark->mask);
spin_unlock(&mark->lock);
if (inode)