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-rw-r--r--fs/notify/dnotify/dnotify.c2
-rw-r--r--fs/notify/fanotify/fanotify_user.c4
-rw-r--r--fs/notify/fsnotify.h2
-rw-r--r--fs/notify/inode_mark.c35
-rw-r--r--fs/notify/inotify/inotify_user.c12
-rw-r--r--fs/notify/mark.c17
-rw-r--r--include/linux/fsnotify_backend.h7
7 files changed, 58 insertions, 21 deletions
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index 69f42df..6624c2e 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -65,7 +65,7 @@ static void dnotify_recalc_inode_mask(struct fsnotify_mark *fsn_mark)
new_mask = 0;
for (dn = dn_mark->dn; dn != NULL; dn = dn->dn_next)
new_mask |= (dn->dn_mask & ~FS_DN_MULTISHOT);
- fsn_mark->mask = new_mask;
+ fsnotify_set_mark_mask_locked(fsn_mark, new_mask);
if (old_mask == new_mask)
return;
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 8415584..3320f0c 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -302,7 +302,7 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark, __u3
spin_lock(&fsn_mark->lock);
oldmask = fsn_mark->mask;
- fsn_mark->mask = oldmask & ~mask;
+ fsnotify_set_mark_mask_locked(fsn_mark, (oldmask & ~mask));
spin_unlock(&fsn_mark->lock);
if (!(oldmask & ~mask))
@@ -359,7 +359,7 @@ static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark, __u32 mas
spin_lock(&fsn_mark->lock);
oldmask = fsn_mark->mask;
- fsn_mark->mask = oldmask | mask;
+ fsnotify_set_mark_mask_locked(fsn_mark, (oldmask | mask));
spin_unlock(&fsn_mark->lock);
return mask & ~oldmask;
diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h
index 204353c..1be54f6 100644
--- a/fs/notify/fsnotify.h
+++ b/fs/notify/fsnotify.h
@@ -20,6 +20,8 @@ extern __u32 fsnotify_vfsmount_mask;
/* destroy all events sitting in this groups notification queue */
extern void fsnotify_flush_notify(struct fsnotify_group *group);
+extern void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *fsn_mark,
+ __u32 mask);
/* add a mark to an inode */
extern int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
struct fsnotify_group *group, struct inode *inode,
diff --git a/fs/notify/inode_mark.c b/fs/notify/inode_mark.c
index c925579..4292f9e 100644
--- a/fs/notify/inode_mark.c
+++ b/fs/notify/inode_mark.c
@@ -141,7 +141,32 @@ struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *group,
}
/*
- * Attach an initialized mark mark to a given group and inode.
+ * 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->i.inode &&
+ !(mark->flags & FSNOTIFY_MARK_FLAG_OBJECT_PINNED)) {
+ mark->flags |= FSNOTIFY_MARK_FLAG_OBJECT_PINNED;
+ inode = igrab(mark->i.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 group and 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.
*/
@@ -152,10 +177,6 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
struct fsnotify_mark *lmark = NULL;
int ret = 0;
- inode = igrab(inode);
- if (unlikely(!inode))
- return -EINVAL;
-
mark->flags = FSNOTIFY_MARK_FLAG_INODE;
assert_spin_locked(&mark->lock);
@@ -175,10 +196,8 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
spin_unlock(&inode->i_lock);
- if (lmark) {
+ if (lmark)
ret = -EEXIST;
- iput(inode);
- }
return ret;
}
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index a12315a..19d2740 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -575,13 +575,11 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
spin_lock(&fsn_mark->lock);
old_mask = fsn_mark->mask;
- if (add) {
- fsn_mark->mask |= mask;
- new_mask = fsn_mark->mask;
- } else {
- fsn_mark->mask = mask;
- new_mask = fsn_mark->mask;
- }
+ if (add)
+ fsnotify_set_mark_mask_locked(fsn_mark, (fsn_mark->mask | mask));
+ else
+ fsnotify_set_mark_mask_locked(fsn_mark, mask);
+ new_mask = fsn_mark->mask;
spin_unlock(&fsn_mark->lock);
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index d296ec9..0ebc3fd 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -168,7 +168,7 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark)
* is just a lazy update (and could be a perf win...)
*/
- if (inode)
+ if (inode && (mark->flags & FSNOTIFY_MARK_FLAG_OBJECT_PINNED))
iput(inode);
/*
@@ -180,6 +180,17 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark)
fsnotify_final_destroy_group(group);
}
+void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask)
+{
+ assert_spin_locked(&mark->lock);
+
+ mark->mask = mask;
+
+ if (mark->flags & FSNOTIFY_MARK_FLAG_INODE)
+ fsnotify_set_inode_mark_mask_locked(mark, mask);
+}
+
+
/*
* Attach an initialized mark to a given group and fs object.
* These marks may be used for the fsnotify backend to determine which
@@ -230,6 +241,10 @@ int fsnotify_add_mark(struct fsnotify_mark *mark,
}
spin_unlock(&group->mark_lock);
+
+ /* this will pin the object if appropriate */
+ fsnotify_set_mark_mask_locked(mark, mark->mask);
+
spin_unlock(&mark->lock);
if (inode)
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 2d2f015..489c881 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -267,8 +267,9 @@ struct fsnotify_mark {
struct fsnotify_vfsmount_mark m;
};
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
+#define FSNOTIFY_MARK_FLAG_INODE 0x01
+#define FSNOTIFY_MARK_FLAG_VFSMOUNT 0x02
+#define FSNOTIFY_MARK_FLAG_OBJECT_PINNED 0x04
unsigned int flags; /* vfsmount or inode mark? */
void (*free_mark)(struct fsnotify_mark *mark); /* called on final put+free */
};
@@ -372,6 +373,8 @@ 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 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 */
extern int fsnotify_add_mark(struct fsnotify_mark *mark, struct fsnotify_group *group,
struct inode *inode, struct vfsmount *mnt, int allow_dups);
generated by cgit v1.1 at 2024-11-01 04:41:33 +0000