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fsnotify: generalize iteration of marks by object type

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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>
This commit is contained in:
Amir Goldstein
2018-04-20 16:10:52 -07:00
committed by Jan Kara
parent d9a6f30bb8
commit 47d9c7cc45
4 changed files with 72 additions and 39 deletions
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23
fs/notify/mark.c
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@@ -294,12 +294,12 @@ static void fsnotify_put_mark_wake(struct fsnotify_mark *mark)
bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info)
{
/* This can fail if mark is being removed */
if (!fsnotify_get_mark_safe(iter_info->inode_mark))
return false;
if (!fsnotify_get_mark_safe(iter_info->vfsmount_mark)) {
fsnotify_put_mark_wake(iter_info->inode_mark);
return false;
int type;
fsnotify_foreach_obj_type(type) {
/* This can fail if mark is being removed */
if (!fsnotify_get_mark_safe(iter_info->marks[type]))
goto fail;
}
/*
@@ -310,13 +310,20 @@ bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info)
srcu_read_unlock(&fsnotify_mark_srcu, iter_info->srcu_idx);
return true;
fail:
for (type--; type >= 0; type--)
fsnotify_put_mark_wake(iter_info->marks[type]);
return false;
}
void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info)
{
int type;
iter_info->srcu_idx = srcu_read_lock(&fsnotify_mark_srcu);
fsnotify_put_mark_wake(iter_info->inode_mark);
fsnotify_put_mark_wake(iter_info->vfsmount_mark);
fsnotify_foreach_obj_type(type)
fsnotify_put_mark_wake(iter_info->marks[type]);
}
/*