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dnotify: report both events on parent and child with single callback 

For some events (e.g. DN_ATTRIB on sub-directory) fsnotify may call
dnotify_handle_event() once for watching parent and once again for
the watching sub-directory.

Do the same thing with a single callback instead of two callbacks when
marks iterator contains both inode and child entries.

Link: https://lore.kernel.org/r/20200716084230.30611-12-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 2020-07-16 11:42:19 +03:00 committed by Jan Kara
parent f35c415678
commit 62cb0af4ce
1 changed files with 29 additions and 13 deletions
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42
fs/notify/dnotify/dnotify.c
View File

@ -70,26 +70,15 @@ static void dnotify_recalc_inode_mask(struct fsnotify_mark *fsn_mark)
* destroy the dnotify struct if it was not registered to receive multiple
* events.
*/
static int dnotify_handle_event(struct fsnotify_group *group, u32 mask,
const void *data, int data_type,
struct inode *dir,
const struct qstr *file_name, u32 cookie,
struct fsnotify_iter_info *iter_info)
static void dnotify_one_event(struct fsnotify_group *group, u32 mask,
struct fsnotify_mark *inode_mark)
{
struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
struct dnotify_mark *dn_mark;
struct dnotify_struct *dn;
struct dnotify_struct **prev;
struct fown_struct *fown;
__u32 test_mask = mask & ~FS_EVENT_ON_CHILD;
/* not a dir, dnotify doesn't care */
if (!dir && !(mask & FS_ISDIR))
return 0;
if (WARN_ON(fsnotify_iter_vfsmount_mark(iter_info)))
return 0;
dn_mark = container_of(inode_mark, struct dnotify_mark, fsn_mark);
spin_lock(&inode_mark->lock);
@ -111,6 +100,33 @@ static int dnotify_handle_event(struct fsnotify_group *group, u32 mask,
}
spin_unlock(&inode_mark->lock);
}
static int dnotify_handle_event(struct fsnotify_group *group, u32 mask,
const void *data, int data_type,
struct inode *dir,
const struct qstr *file_name, u32 cookie,
struct fsnotify_iter_info *iter_info)
{
struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
struct fsnotify_mark *child_mark = fsnotify_iter_child_mark(iter_info);
/* not a dir, dnotify doesn't care */
if (!dir && !(mask & FS_ISDIR))
return 0;
if (WARN_ON(fsnotify_iter_vfsmount_mark(iter_info)))
return 0;
/*
* Some events can be sent on both parent dir and subdir marks
* (e.g. DN_ATTRIB). If both parent dir and subdir are watching,
* report the event once to parent dir and once to subdir.
*/
if (inode_mark)
dnotify_one_event(group, mask, inode_mark);
if (child_mark)
dnotify_one_event(group, mask, child_mark);
return 0;
}