From: Amir Goldstein <amir73il@gmail.com>
To: Gabriel Krisman Bertazi <krisman@collabora.com>
Cc: Jan Kara <jack@suse.com>, Linux API <linux-api@vger.kernel.org>,
Ext4 <linux-ext4@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Khazhismel Kumykov <khazhy@google.com>,
David Howells <dhowells@redhat.com>,
Dave Chinner <david@fromorbit.com>, Theodore Tso <tytso@mit.edu>,
"Darrick J. Wong" <djwong@kernel.org>,
Matthew Bobrowski <repnop@google.com>,
kernel@collabora.com
Subject: Re: [PATCH v6 17/21] fanotify: Report fid info for file related file system errors
Date: Fri, 13 Aug 2021 12:00:36 +0300 [thread overview]
Message-ID: <CAOQ4uxg1ZhZi25aeF80a2bdWo8p+3ZNMZegZBi2PKM5fa_GfYg@mail.gmail.com> (raw)
In-Reply-To: <20210812214010.3197279-18-krisman@collabora.com>
On Fri, Aug 13, 2021 at 12:41 AM Gabriel Krisman Bertazi
<krisman@collabora.com> wrote:
>
> Plumb the pieces to add a FID report to error records. Since all error
> event memory must be pre-allocated, we estimate a file handle size and
> if it is insuficient, we report an invalid FID and increase the
> prediction for the next error slot allocation.
>
> For errors that don't expose a file handle report it with an invalid
> FID.
>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
>
> ---
> Changes since v5:
> - Use preallocated MAX_HANDLE_SZ FH buffer
> - Report superblock errors with a zerolength INVALID FID (jan, amir)
> ---
> fs/notify/fanotify/fanotify.c | 15 +++++++++++++++
> fs/notify/fanotify/fanotify.h | 11 +++++++++++
> fs/notify/fanotify/fanotify_user.c | 7 +++++++
> 3 files changed, 33 insertions(+)
>
> diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
> index 0c7667d3f5d1..f5c16ac37835 100644
> --- a/fs/notify/fanotify/fanotify.c
> +++ b/fs/notify/fanotify/fanotify.c
> @@ -734,6 +734,8 @@ static int fanotify_handle_error_event(struct fsnotify_iter_info *iter_info,
> struct fanotify_sb_mark *sb_mark =
> FANOTIFY_SB_MARK(fsnotify_iter_sb_mark(iter_info));
> struct fanotify_error_event *fee = sb_mark->fee_slot;
> + struct inode *inode = report->inode;
> + int fh_len;
>
> spin_lock(&group->notification_lock);
> if (fee->err_count++) {
> @@ -743,6 +745,19 @@ static int fanotify_handle_error_event(struct fsnotify_iter_info *iter_info,
> spin_unlock(&group->notification_lock);
>
> fee->fae.type = FANOTIFY_EVENT_TYPE_FS_ERROR;
> + fee->fsid = fee->sb_mark->fsn_mark.connector->fsid;
> +
> + fh_len = fanotify_encode_fh_len(inode);
> + if (WARN_ON(fh_len > MAX_HANDLE_SZ)) {
> + /*
> + * Fallback to reporting the error against the super
> + * block. It should never happen.
> + */
> + inode = NULL;
> + fh_len = fanotify_encode_fh_len(NULL);
> + }
> +
> + fanotify_encode_fh(&fee->object_fh, inode, fh_len, NULL, 0);
>
> if (fsnotify_insert_event(group, &fee->fae.fse,
> NULL, fanotify_insert_error_event)) {
> diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h
> index eeb4a85af74e..158cf0c4b0bd 100644
> --- a/fs/notify/fanotify/fanotify.h
> +++ b/fs/notify/fanotify/fanotify.h
> @@ -223,6 +223,13 @@ struct fanotify_error_event {
> u32 err_count; /* Suppressed errors count */
>
> struct fanotify_sb_mark *sb_mark; /* Back reference to the mark. */
> +
> + __kernel_fsid_t fsid; /* FSID this error refers to. */
> +
> + /* object_fh must be followed by the inline handle buffer. */
> + struct fanotify_fh object_fh;
> + /* Reserve space in object_fh.buf[] - access with fanotify_fh_buf() */
> + unsigned char _inline_fh_buf[MAX_HANDLE_SZ];
> };
>
> static inline struct fanotify_error_event *
> @@ -237,6 +244,8 @@ static inline __kernel_fsid_t *fanotify_event_fsid(struct fanotify_event *event)
> return &FANOTIFY_FE(event)->fsid;
> else if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)
> return &FANOTIFY_NE(event)->fsid;
> + else if (event->type == FANOTIFY_EVENT_TYPE_FS_ERROR)
> + return &FANOTIFY_EE(event)->fsid;
> else
> return NULL;
> }
> @@ -248,6 +257,8 @@ static inline struct fanotify_fh *fanotify_event_object_fh(
> return &FANOTIFY_FE(event)->object_fh;
> else if (event->type == FANOTIFY_EVENT_TYPE_FID_NAME)
> return fanotify_info_file_fh(&FANOTIFY_NE(event)->info);
> + else if (event->type == FANOTIFY_EVENT_TYPE_FS_ERROR)
> + return &FANOTIFY_EE(event)->object_fh;
> else
> return NULL;
> }
> diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
> index 3fff0c994dc8..1ab8f9d8b3ac 100644
> --- a/fs/notify/fanotify/fanotify_user.c
> +++ b/fs/notify/fanotify/fanotify_user.c
> @@ -177,6 +177,13 @@ static struct fanotify_event *fanotify_dup_error_to_stack(
> error_on_stack->err_count = fee->err_count;
> error_on_stack->sb_mark = fee->sb_mark;
>
> + error_on_stack->fsid = fee->fsid;
> +
> + memcpy(&error_on_stack->object_fh, &fee->object_fh,
> + sizeof(fee->object_fh));
> + memcpy(error_on_stack->object_fh.buf, fee->object_fh.buf,
> + fee->object_fh.len);
> +
I would go with:
size_t len = offsetof(struct fanotify_error_event, _inline_fh_buf)
+ fee->object_fh.len);
memcpy(error_on_stack, fee, len);
But maybe it's just me, so I don't insist.
Thanks,
Amir.
next prev parent reply other threads:[~2021-08-13 9:00 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-12 21:39 [PATCH v6 00/21] File system wide monitoring Gabriel Krisman Bertazi
2021-08-12 21:39 ` [PATCH v6 01/21] fsnotify: Don't insert unmergeable events in hashtable Gabriel Krisman Bertazi
2021-08-12 21:39 ` [PATCH v6 02/21] fanotify: Fold event size calculation to its own function Gabriel Krisman Bertazi
2021-08-12 21:39 ` [PATCH v6 03/21] fanotify: Split fsid check from other fid mode checks Gabriel Krisman Bertazi
2021-08-12 21:39 ` [PATCH v6 04/21] fsnotify: Reserve mark flag bits for backends Gabriel Krisman Bertazi
2021-08-13 7:28 ` Amir Goldstein
2021-08-16 13:15 ` Jan Kara
2021-08-23 14:36 ` Gabriel Krisman Bertazi
2021-08-12 21:39 ` [PATCH v6 05/21] fanotify: Split superblock marks out to a new cache Gabriel Krisman Bertazi
2021-08-16 13:18 ` Jan Kara
2021-08-12 21:39 ` [PATCH v6 06/21] inotify: Don't force FS_IN_IGNORED Gabriel Krisman Bertazi
2021-08-12 21:39 ` [PATCH v6 07/21] fsnotify: Add helper to detect overflow_event Gabriel Krisman Bertazi
2021-08-12 21:39 ` [PATCH v6 08/21] fsnotify: Add wrapper around fsnotify_add_event Gabriel Krisman Bertazi
2021-08-12 21:39 ` [PATCH v6 09/21] fsnotify: Allow events reported with an empty inode Gabriel Krisman Bertazi
2021-08-13 7:58 ` Amir Goldstein
2021-08-25 18:40 ` Gabriel Krisman Bertazi
2021-08-25 19:45 ` Amir Goldstein
2021-08-25 21:50 ` Gabriel Krisman Bertazi
2021-08-26 10:44 ` Amir Goldstein
2021-08-27 2:26 ` Paul Moore
2021-08-12 21:39 ` [PATCH v6 10/21] fsnotify: Support FS_ERROR event type Gabriel Krisman Bertazi
2021-08-13 7:48 ` Amir Goldstein
2021-08-16 13:23 ` Jan Kara
2021-08-12 21:40 ` [PATCH v6 11/21] fanotify: Allow file handle encoding for unhashed events Gabriel Krisman Bertazi
2021-08-13 7:59 ` Amir Goldstein
2021-08-12 21:40 ` [PATCH v6 12/21] fanotify: Encode invalid file handle when no inode is provided Gabriel Krisman Bertazi
2021-08-13 8:27 ` Amir Goldstein
2021-08-16 14:06 ` Jan Kara
2021-08-16 15:54 ` Amir Goldstein
2021-08-16 16:11 ` Jan Kara
2021-08-12 21:40 ` [PATCH v6 13/21] fanotify: Require fid_mode for any non-fd event Gabriel Krisman Bertazi
2021-08-13 8:28 ` Amir Goldstein
2021-08-12 21:40 ` [PATCH v6 14/21] fanotify: Reserve UAPI bits for FAN_FS_ERROR Gabriel Krisman Bertazi
2021-08-13 8:29 ` Amir Goldstein
2021-08-12 21:40 ` [PATCH v6 15/21] fanotify: Preallocate per superblock mark error event Gabriel Krisman Bertazi
2021-08-13 8:40 ` Amir Goldstein
2021-08-16 15:57 ` Jan Kara
2021-08-27 18:18 ` Gabriel Krisman Bertazi
2021-09-02 21:24 ` Gabriel Krisman Bertazi
2021-09-03 4:16 ` Amir Goldstein
2021-09-15 10:31 ` Jan Kara
2021-08-12 21:40 ` [PATCH v6 16/21] fanotify: Handle FAN_FS_ERROR events Gabriel Krisman Bertazi
2021-08-13 9:35 ` Amir Goldstein
2021-08-12 21:40 ` [PATCH v6 17/21] fanotify: Report fid info for file related file system errors Gabriel Krisman Bertazi
2021-08-13 9:00 ` Amir Goldstein [this message]
2021-08-13 9:03 ` Amir Goldstein
2021-08-16 16:18 ` Jan Kara
2021-08-12 21:40 ` [PATCH v6 18/21] fanotify: Emit generic error info type for error event Gabriel Krisman Bertazi
2021-08-13 8:47 ` Amir Goldstein
2021-08-16 16:23 ` Jan Kara
2021-08-16 21:41 ` Darrick J. Wong
2021-08-17 9:05 ` Jan Kara
2021-08-17 10:08 ` Amir Goldstein
2021-08-18 0:16 ` Darrick J. Wong
2021-08-18 3:24 ` Amir Goldstein
2021-08-18 9:58 ` Jan Kara
2021-08-19 3:58 ` Darrick J. Wong
2021-08-18 0:10 ` Darrick J. Wong
2021-08-24 16:53 ` Gabriel Krisman Bertazi
2021-08-25 4:09 ` Darrick J. Wong
2021-08-12 21:40 ` [PATCH v6 19/21] ext4: Send notifications on error Gabriel Krisman Bertazi
2021-08-16 16:26 ` Jan Kara
2021-08-12 21:40 ` [PATCH v6 20/21] samples: Add fs error monitoring example Gabriel Krisman Bertazi
2021-08-18 13:02 ` Jan Kara
2021-08-23 14:49 ` Gabriel Krisman Bertazi
2021-08-12 21:40 ` [PATCH v6 21/21] docs: Document the FAN_FS_ERROR event Gabriel Krisman Bertazi
2021-08-16 16:40 ` Jan Kara
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