From: Amir Goldstein <amir73il@gmail.com>
To: Gabriel Krisman Bertazi <krisman@collabora.com>
Cc: "Darrick J. Wong" <djwong@kernel.org>,
Theodore Tso <tytso@mit.edu>, Dave Chinner <david@fromorbit.com>,
Jan Kara <jack@suse.com>, David Howells <dhowells@redhat.com>,
Khazhismel Kumykov <khazhy@google.com>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Ext4 <linux-ext4@vger.kernel.org>,
kernel@collabora.com
Subject: Re: [PATCH v3 01/15] fsnotify: Don't insert unmergeable events in hashtable
Date: Wed, 30 Jun 2021 06:12:53 +0300 [thread overview]
Message-ID: <CAOQ4uxjHV6+8a1+Ff09ezSdEvG7SyO9kF+eHsw4xGvNLWF7gtQ@mail.gmail.com> (raw)
In-Reply-To: <20210629191035.681913-2-krisman@collabora.com>
On Tue, Jun 29, 2021 at 10:11 PM Gabriel Krisman Bertazi
<krisman@collabora.com> wrote:
>
> Some events, like the overflow event, are not mergeable, so they are not
> hashed. But, when failing inside fsnotify_add_event for lack of space,
> fsnotify_add_event() still calls the insert hook, which adds the
> overflow event to the merge list. Add a check to prevent any kind of
> unmergeable event to be inserted in the hashtable.
>
> Fixes: 94e00d28a680 ("fsnotify: use hash table for faster events merge")
> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
> ---
> Changes since v2:
> - Do check for hashed events inside the insert hook (Amir)
> ---
> fs/notify/fanotify/fanotify.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
> index 057abd2cf887..310246f8d3f1 100644
> --- a/fs/notify/fanotify/fanotify.c
> +++ b/fs/notify/fanotify/fanotify.c
> @@ -702,6 +702,9 @@ static void fanotify_insert_event(struct fsnotify_group *group,
>
> assert_spin_locked(&group->notification_lock);
>
> + if (!fanotify_is_hashed_event(event->mask))
> + return;
> +
> pr_debug("%s: group=%p event=%p bucket=%u\n", __func__,
> group, event, bucket);
>
> @@ -779,8 +782,7 @@ static int fanotify_handle_event(struct fsnotify_group *group, u32 mask,
>
> fsn_event = &event->fse;
> ret = fsnotify_add_event(group, fsn_event, fanotify_merge,
> - fanotify_is_hashed_event(mask) ?
> - fanotify_insert_event : NULL);
> + fanotify_insert_event);
> if (ret) {
> /* Permission events shouldn't be merged */
> BUG_ON(ret == 1 && mask & FANOTIFY_PERM_EVENTS);
> --
> 2.32.0
>
next prev parent reply other threads:[~2021-06-30 3:13 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-29 19:10 [PATCH v3 00/15] File system wide monitoring Gabriel Krisman Bertazi
2021-06-29 19:10 ` [PATCH v3 01/15] fsnotify: Don't insert unmergeable events in hashtable Gabriel Krisman Bertazi
2021-06-30 3:12 ` Amir Goldstein [this message]
2021-07-07 19:21 ` Jan Kara
2021-06-29 19:10 ` [PATCH v3 02/15] fanotify: Fold event size calculation to its own function Gabriel Krisman Bertazi
2021-07-07 19:22 ` Jan Kara
2021-06-29 19:10 ` [PATCH v3 03/15] fanotify: Split fsid check from other fid mode checks Gabriel Krisman Bertazi
2021-06-30 3:14 ` Amir Goldstein
2021-07-07 19:24 ` Jan Kara
2021-06-29 19:10 ` [PATCH v3 04/15] fanotify: Split superblock marks out to a new cache Gabriel Krisman Bertazi
2021-06-30 3:17 ` Amir Goldstein
2021-07-07 20:13 ` Jan Kara
2021-07-08 6:16 ` Amir Goldstein
2021-06-29 19:10 ` [PATCH v3 05/15] inotify: Don't force FS_IN_IGNORED Gabriel Krisman Bertazi
2021-07-07 19:37 ` Jan Kara
2021-06-29 19:10 ` [PATCH v3 06/15] fsnotify: Add helper to detect overflow_event Gabriel Krisman Bertazi
2021-07-07 20:14 ` Jan Kara
2021-06-29 19:10 ` [PATCH v3 07/15] fsnotify: pass arguments of fsnotify() in struct fsnotify_event_info Gabriel Krisman Bertazi
2021-06-29 20:39 ` kernel test robot
2021-06-30 0:10 ` kernel test robot
2021-06-30 3:29 ` Amir Goldstein
2021-06-30 8:11 ` Dan Carpenter
2021-06-30 8:35 ` Amir Goldstein
2021-06-30 8:45 ` Dan Carpenter
2021-06-30 9:32 ` Amir Goldstein
2021-06-30 9:34 ` Amir Goldstein
2021-06-30 10:49 ` Dan Carpenter
2021-06-30 12:51 ` Amir Goldstein
2021-07-08 10:43 ` Jan Kara
2021-07-08 11:09 ` Amir Goldstein
2021-07-08 11:37 ` Jan Kara
2021-06-29 19:10 ` [PATCH v3 08/15] fsnotify: Support passing argument to insert callback on add_event Gabriel Krisman Bertazi
2021-06-30 3:40 ` Amir Goldstein
2021-07-08 10:48 ` Jan Kara
2021-06-29 19:10 ` [PATCH v3 09/15] fsnotify: Always run the merge hook Gabriel Krisman Bertazi
2021-06-30 3:42 ` Amir Goldstein
2021-06-29 19:10 ` [PATCH v3 10/15] fsnotify: Support FS_ERROR event type Gabriel Krisman Bertazi
2021-07-08 10:53 ` Jan Kara
2021-06-29 19:10 ` [PATCH v3 11/15] fsnotify: Introduce helpers to send error_events Gabriel Krisman Bertazi
2021-06-30 3:44 ` Amir Goldstein
2021-07-08 11:02 ` Jan Kara
2021-06-29 19:10 ` [PATCH v3 12/15] fanotify: Introduce FAN_FS_ERROR event Gabriel Krisman Bertazi
2021-06-30 10:26 ` Amir Goldstein
2021-06-30 17:43 ` Gabriel Krisman Bertazi
2021-07-01 6:37 ` Amir Goldstein
2021-06-30 14:03 ` Amir Goldstein
2021-06-29 19:10 ` [PATCH v3 13/15] ext4: Send notifications on error Gabriel Krisman Bertazi
2021-06-29 19:10 ` [PATCH v3 14/15] samples: Add fs error monitoring example Gabriel Krisman Bertazi
2021-06-30 2:42 ` kernel test robot
2021-07-19 14:36 ` Gabriel Krisman Bertazi
2021-07-20 19:49 ` Dan Carpenter
2021-07-22 12:54 ` Chen, Rong A
2021-07-22 16:15 ` Gabriel Krisman Bertazi
2021-07-23 1:35 ` Chen, Rong A
2021-06-30 3:46 ` kernel test robot
2021-06-30 3:58 ` Amir Goldstein
2021-06-29 19:10 ` [PATCH v3 15/15] docs: Document the FAN_FS_ERROR event Gabriel Krisman Bertazi
2021-06-30 4:18 ` Amir Goldstein
2021-06-30 5:10 ` [PATCH v3 00/15] File system wide monitoring Amir Goldstein
2021-07-08 11:32 ` Jan Kara
2021-07-08 12:25 ` Amir Goldstein
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