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fsnotify: replace inode pointer with an object id

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The event inode field is used only for comparison in queue merges and
cannot be dereferenced after handle_event(), because it does not hold a
refcount on the inode.

Replace it with an abstract id to do the same thing.

Link: https://lore.kernel.org/r/20200319151022.31456-8-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2020-03-19 17:10:15 +02:00 • committed by Jan Kara
parent 017de65fe5
commit dfc2d2594e
4 changed files with 8 additions and 9 deletions
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7
include/linux/fsnotify_backend.h
View file

@ -132,8 +132,7 @@ struct fsnotify_ops {
*/
struct fsnotify_event {
struct list_head list;
/* inode may ONLY be dereferenced during handle_event(). */
struct inode *inode; /* either the inode the event happened to or its parent */
unsigned long objectid; /* identifier for queue merges */
};
/*
@ -526,10 +525,10 @@ extern void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info);
extern bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info);
static inline void fsnotify_init_event(struct fsnotify_event *event,
struct inode *inode)
unsigned long objectid)
{
INIT_LIST_HEAD(&event->list);
event->inode = inode;
event->objectid = objectid;
}
#else