fsnotify: pass both the vfsmount mark and inode mark
should_send_event() and handle_event() will both need to look up the inode
event if they get a vfsmount event. Lets just pass both at the same time
since we have them both after walking the lists in lockstep.
Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index cdaa51c..090b64c 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -141,28 +141,51 @@
EXPORT_SYMBOL_GPL(__fsnotify_parent);
static int send_to_group(struct inode *to_tell, struct vfsmount *mnt,
- struct fsnotify_mark *mark,
- __u32 mask, void *data,
+ struct fsnotify_mark *inode_mark,
+ struct fsnotify_mark *vfsmount_mark,
+ __u32 mask, void *data,
int data_is, u32 cookie,
const unsigned char *file_name,
struct fsnotify_event **event)
{
- struct fsnotify_group *group = mark->group;
- __u32 test_mask = (mask & ~FS_EVENT_ON_CHILD);
+ struct fsnotify_group *group = inode_mark->group;
+ __u32 inode_test_mask = (mask & ~FS_EVENT_ON_CHILD);
+ __u32 vfsmount_test_mask = (mask & ~FS_EVENT_ON_CHILD);
pr_debug("%s: group=%p to_tell=%p mnt=%p mark=%p mask=%x data=%p"
" data_is=%d cookie=%d event=%p\n", __func__, group, to_tell,
- mnt, mark, mask, data, data_is, cookie, *event);
+ mnt, inode_mark, mask, data, data_is, cookie, *event);
- if ((mask & FS_MODIFY) &&
- !(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
- mark->ignored_mask = 0;
+ /* clear ignored on inode modification */
+ if (mask & FS_MODIFY) {
+ if (inode_mark &&
+ !(inode_mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
+ inode_mark->ignored_mask = 0;
+ if (vfsmount_mark &&
+ !(vfsmount_mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
+ vfsmount_mark->ignored_mask = 0;
+ }
- if (!(test_mask & mark->mask & ~mark->ignored_mask))
+ /* does the inode mark tell us to do something? */
+ if (inode_mark) {
+ inode_test_mask &= inode_mark->mask;
+ inode_test_mask &= ~inode_mark->ignored_mask;
+ }
+
+ /* does the vfsmount_mark tell us to do something? */
+ if (vfsmount_mark) {
+ vfsmount_test_mask &= vfsmount_mark->mask;
+ vfsmount_test_mask &= ~vfsmount_mark->ignored_mask;
+ if (inode_mark)
+ vfsmount_test_mask &= ~inode_mark->ignored_mask;
+ }
+
+ if (!inode_test_mask && !vfsmount_test_mask)
return 0;
- if (group->ops->should_send_event(group, to_tell, mnt, mark, mask,
- data, data_is) == false)
+ if (group->ops->should_send_event(group, to_tell, mnt, inode_mark,
+ vfsmount_mark, mask, data,
+ data_is) == false)
return 0;
if (!*event) {
@@ -172,7 +195,7 @@
if (!*event)
return -ENOMEM;
}
- return group->ops->handle_event(group, mark, *event);
+ return group->ops->handle_event(group, inode_mark, vfsmount_mark, *event);
}
/*
@@ -213,14 +236,16 @@
if ((mask & FS_MODIFY) ||
(test_mask & to_tell->i_fsnotify_mask))
- inode_node = to_tell->i_fsnotify_marks.first;
+ inode_node = srcu_dereference(to_tell->i_fsnotify_marks.first,
+ &fsnotify_mark_srcu);
else
inode_node = NULL;
if (mnt) {
if ((mask & FS_MODIFY) ||
(test_mask & mnt->mnt_fsnotify_mask))
- vfsmount_node = mnt->mnt_fsnotify_marks.first;
+ vfsmount_node = srcu_dereference(mnt->mnt_fsnotify_marks.first,
+ &fsnotify_mark_srcu);
else
vfsmount_node = NULL;
} else {
@@ -245,26 +270,27 @@
if (inode_group < vfsmount_group) {
/* handle inode */
- send_to_group(to_tell, NULL, inode_mark, mask, data,
+ send_to_group(to_tell, NULL, inode_mark, NULL, mask, data,
data_is, cookie, file_name, &event);
used_inode = true;
} else if (vfsmount_group < inode_group) {
- send_to_group(to_tell, mnt, vfsmount_mark, mask, data,
+ send_to_group(to_tell, mnt, NULL, vfsmount_mark, mask, data,
data_is, cookie, file_name, &event);
used_vfsmount = true;
} else {
- send_to_group(to_tell, mnt, vfsmount_mark, mask, data,
- data_is, cookie, file_name, &event);
+ send_to_group(to_tell, mnt, inode_mark, vfsmount_mark,
+ mask, data, data_is, cookie, file_name,
+ &event);
used_vfsmount = true;
- send_to_group(to_tell, NULL, inode_mark, mask, data,
- data_is, cookie, file_name, &event);
used_inode = true;
}
if (used_inode)
- inode_node = inode_node->next;
+ inode_node = srcu_dereference(inode_node->next,
+ &fsnotify_mark_srcu);
if (used_vfsmount)
- vfsmount_node = vfsmount_node->next;
+ vfsmount_node = srcu_dereference(vfsmount_node->next,
+ &fsnotify_mark_srcu);
}
srcu_read_unlock(&fsnotify_mark_srcu, idx);