On Thu 14-10-21 18:36:43, Gabriel Krisman Bertazi wrote:
> Wire up the FAN_FS_ERROR event in the fanotify_mark syscall, allowing
> user space to request the monitoring of FAN_FS_ERROR events.
>
> These events are limited to filesystem marks, so check it is the
> case in the syscall handler.
>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>
No other comment besides what Amir has written...
Honza
> ---
> fs/notify/fanotify/fanotify.c | 2 +-
> fs/notify/fanotify/fanotify_user.c | 5 +++++
> include/linux/fanotify.h | 6 +++++-
> 3 files changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
> index 47e28f418711..d449a23d603f 100644
> --- a/fs/notify/fanotify/fanotify.c
> +++ b/fs/notify/fanotify/fanotify.c
> @@ -827,7 +827,7 @@ static int fanotify_handle_event(struct fsnotify_group *group, u32 mask,
> BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM);
> BUILD_BUG_ON(FAN_FS_ERROR != FS_ERROR);
>
> - BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 19);
> + BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 20);
>
> mask = fanotify_group_event_mask(group, iter_info, mask, data,
> data_type, dir);
> diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
> index 8f7c2f4ce674..5edfd7e3f356 100644
> --- a/fs/notify/fanotify/fanotify_user.c
> +++ b/fs/notify/fanotify/fanotify_user.c
> @@ -1585,6 +1585,11 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
> fsid = &__fsid;
> }
>
> + if (mask & FAN_FS_ERROR && mark_type != FAN_MARK_FILESYSTEM) {
> + ret = -EINVAL;
> + goto path_put_and_out;
> + }
> +
> /* inode held in place by reference to path; group by fget on fd */
> if (mark_type == FAN_MARK_INODE)
> inode = path.dentry->d_inode;
> diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
> index 52d464802d99..616af2ea20f3 100644
> --- a/include/linux/fanotify.h
> +++ b/include/linux/fanotify.h
> @@ -91,9 +91,13 @@ extern struct ctl_table fanotify_table[]; /* for sysctl */
> #define FANOTIFY_INODE_EVENTS (FANOTIFY_DIRENT_EVENTS | \
> FAN_ATTRIB | FAN_MOVE_SELF | FAN_DELETE_SELF)
>
> +/* Events that can only be reported with data type FSNOTIFY_EVENT_ERROR */
> +#define FANOTIFY_ERROR_EVENTS (FAN_FS_ERROR)
> +
> /* Events that user can request to be notified on */
> #define FANOTIFY_EVENTS (FANOTIFY_PATH_EVENTS | \
> - FANOTIFY_INODE_EVENTS)
> + FANOTIFY_INODE_EVENTS | \
> + FANOTIFY_ERROR_EVENTS)
>
> /* Events that require a permission response from user */
> #define FANOTIFY_PERM_EVENTS (FAN_OPEN_PERM | FAN_ACCESS_PERM | \
> --
> 2.33.0
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
