From: Jan Kara <jack@suse.cz>
To: Gabriel Krisman Bertazi <krisman@collabora.com>
Cc: amir73il@gmail.com, djwong@kernel.org, tytso@mit.edu,
david@fromorbit.com, jack@suse.com, dhowells@redhat.com,
khazhy@google.com, linux-fsdevel@vger.kernel.org,
linux-ext4@vger.kernel.org, kernel@collabora.com
Subject: Re: [PATCH v3 03/15] fanotify: Split fsid check from other fid mode checks
Date: Wed, 7 Jul 2021 21:24:26 +0200 [thread overview]
Message-ID: <20210707192426.GE18396@quack2.suse.cz> (raw)
In-Reply-To: <20210629191035.681913-4-krisman@collabora.com>
On Tue 29-06-21 15:10:23, Gabriel Krisman Bertazi wrote:
> FAN_FS_ERROR will require fsid, but not necessarily require the
> filesystem to expose a file handle. Split those checks into different
> functions, so they can be used separately when setting up an event.
>
> While there, update a comment about tmpfs having 0 fsid, which is no
> longer true.
>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Looks good. Feel free to add:
Reviewed-by: Jan Kara <jack@suse.cz>
Honza
>
> ---
> Changes since v2:
> - FAN_ERROR -> FAN_FS_ERROR (Amir)
> - Update comment (Amir)
>
> Changes since v1:
> (Amir)
> - Sort hunks to simplify diff.
> Changes since RFC:
> (Amir)
> - Rename fanotify_check_path_fsid -> fanotify_test_fsid.
> - Use dentry directly instead of path.
> ---
> fs/notify/fanotify/fanotify_user.c | 27 ++++++++++++++++++---------
> 1 file changed, 18 insertions(+), 9 deletions(-)
>
> diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
> index 68a53d3534f8..67b18dfe0025 100644
> --- a/fs/notify/fanotify/fanotify_user.c
> +++ b/fs/notify/fanotify/fanotify_user.c
> @@ -1192,16 +1192,15 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
> return fd;
> }
>
> -/* Check if filesystem can encode a unique fid */
> -static int fanotify_test_fid(struct path *path, __kernel_fsid_t *fsid)
> +static int fanotify_test_fsid(struct dentry *dentry, __kernel_fsid_t *fsid)
> {
> __kernel_fsid_t root_fsid;
> int err;
>
> /*
> - * Make sure path is not in filesystem with zero fsid (e.g. tmpfs).
> + * Make sure dentry is not of a filesystem with zero fsid (e.g. fuse).
> */
> - err = vfs_get_fsid(path->dentry, fsid);
> + err = vfs_get_fsid(dentry, fsid);
> if (err)
> return err;
>
> @@ -1209,10 +1208,10 @@ static int fanotify_test_fid(struct path *path, __kernel_fsid_t *fsid)
> return -ENODEV;
>
> /*
> - * Make sure path is not inside a filesystem subvolume (e.g. btrfs)
> + * Make sure dentry is not of a filesystem subvolume (e.g. btrfs)
> * which uses a different fsid than sb root.
> */
> - err = vfs_get_fsid(path->dentry->d_sb->s_root, &root_fsid);
> + err = vfs_get_fsid(dentry->d_sb->s_root, &root_fsid);
> if (err)
> return err;
>
> @@ -1220,6 +1219,12 @@ static int fanotify_test_fid(struct path *path, __kernel_fsid_t *fsid)
> root_fsid.val[1] != fsid->val[1])
> return -EXDEV;
>
> + return 0;
> +}
> +
> +/* Check if filesystem can encode a unique fid */
> +static int fanotify_test_fid(struct dentry *dentry)
> +{
> /*
> * We need to make sure that the file system supports at least
> * encoding a file handle so user can use name_to_handle_at() to
> @@ -1227,8 +1232,8 @@ static int fanotify_test_fid(struct path *path, __kernel_fsid_t *fsid)
> * objects. However, name_to_handle_at() requires that the
> * filesystem also supports decoding file handles.
> */
> - if (!path->dentry->d_sb->s_export_op ||
> - !path->dentry->d_sb->s_export_op->fh_to_dentry)
> + if (!dentry->d_sb->s_export_op ||
> + !dentry->d_sb->s_export_op->fh_to_dentry)
> return -EOPNOTSUPP;
>
> return 0;
> @@ -1379,7 +1384,11 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
> }
>
> if (fid_mode) {
> - ret = fanotify_test_fid(&path, &__fsid);
> + ret = fanotify_test_fsid(path.dentry, &__fsid);
> + if (ret)
> + goto path_put_and_out;
> +
> + ret = fanotify_test_fid(path.dentry);
> if (ret)
> goto path_put_and_out;
>
> --
> 2.32.0
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2021-07-07 19:24 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
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 [this message]
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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