fsnotify: generalize iteration of marks by object type
Make some code that handles marks of object types inode and vfsmount
generic, so it can handle other object types.
Introduce fsnotify_foreach_obj_type macro to iterate marks by object type
and fsnotify_iter_{should|set}_report_type macros to set/test report_mask.
This is going to be used for adding mark of another object type
(super block mark).
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 98e9103..bc9a514 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -269,25 +269,29 @@ static struct fsnotify_mark *fsnotify_next_mark(struct fsnotify_mark *mark)
static unsigned int fsnotify_iter_select_report_types(
struct fsnotify_iter_info *iter_info)
{
- struct fsnotify_mark *inode_mark = iter_info->inode_mark;
- struct fsnotify_mark *vfsmount_mark = iter_info->vfsmount_mark;
- int cmp;
+ struct fsnotify_group *max_prio_group = NULL;
+ struct fsnotify_mark *mark;
+ int type;
- if (!inode_mark && !vfsmount_mark)
- return 0;
-
- if (inode_mark && vfsmount_mark) {
- cmp = fsnotify_compare_groups(inode_mark->group,
- vfsmount_mark->group);
- } else {
- cmp = inode_mark ? -1 : 1;
+ /* Choose max prio group among groups of all queue heads */
+ fsnotify_foreach_obj_type(type) {
+ mark = iter_info->marks[type];
+ if (mark &&
+ fsnotify_compare_groups(max_prio_group, mark->group) > 0)
+ max_prio_group = mark->group;
}
+ if (!max_prio_group)
+ return 0;
+
+ /* Set the report mask for marks from same group as max prio group */
iter_info->report_mask = 0;
- if (cmp <= 0)
- iter_info->report_mask |= FSNOTIFY_OBJ_TYPE_INODE_FL;
- if (cmp >= 0)
- iter_info->report_mask |= FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL;
+ fsnotify_foreach_obj_type(type) {
+ mark = iter_info->marks[type];
+ if (mark &&
+ fsnotify_compare_groups(max_prio_group, mark->group) == 0)
+ fsnotify_iter_set_report_type(iter_info, type);
+ }
return iter_info->report_mask;
}
@@ -298,13 +302,13 @@ static unsigned int fsnotify_iter_select_report_types(
*/
static void fsnotify_iter_next(struct fsnotify_iter_info *iter_info)
{
- if (iter_info->report_mask & FSNOTIFY_OBJ_TYPE_INODE_FL)
- iter_info->inode_mark =
- fsnotify_next_mark(iter_info->inode_mark);
+ int type;
- if (iter_info->report_mask & FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL)
- iter_info->vfsmount_mark =
- fsnotify_next_mark(iter_info->vfsmount_mark);
+ fsnotify_foreach_obj_type(type) {
+ if (fsnotify_iter_should_report_type(iter_info, type))
+ iter_info->marks[type] =
+ fsnotify_next_mark(iter_info->marks[type]);
+ }
}
/*
@@ -351,15 +355,15 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
if ((mask & FS_MODIFY) ||
(test_mask & to_tell->i_fsnotify_mask)) {
- iter_info.inode_mark =
+ iter_info.marks[FSNOTIFY_OBJ_TYPE_INODE] =
fsnotify_first_mark(&to_tell->i_fsnotify_marks);
}
if (mnt && ((mask & FS_MODIFY) ||
(test_mask & mnt->mnt_fsnotify_mask))) {
- iter_info.inode_mark =
+ iter_info.marks[FSNOTIFY_OBJ_TYPE_INODE] =
fsnotify_first_mark(&to_tell->i_fsnotify_marks);
- iter_info.vfsmount_mark =
+ iter_info.marks[FSNOTIFY_OBJ_TYPE_VFSMOUNT] =
fsnotify_first_mark(&mnt->mnt_fsnotify_marks);
}