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generated by cgit v1.2.3 (git 2.46.0) at 2026-08-07 00:42:01 +0000
on about filesystem health events to userspace. This is done by creating an anonymous file that can be read() for events by userspace programs. Events are captured by hooking various parts of XFS and iomap so that metadata health failures, file I/O errors, and major changes in filesystem state (unmounts, shutdowns, etc.) can be observed by programs. When an event occurs, the hook functions queue an event object to each event anonfd for later processing. Programs must have CAP_SYS_ADMIN to open the anonfd and there's a maximum event lag to prevent resource overconsumption. The events themselves can be read() from the anonfd as C structs for the xfs_healer daemon. In userspace, we create a new daemon program that will read the event objects and initiate repairs automatically. This daemon is managed entirely by systemd and will not block unmounting of the filesystem unless repairs are ongoing. They are auto-started by a starter service that uses fanotify. This patchset depends on the new fserror code that Christian Brauner has tentatively accepted for Linux 7.0: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git/log/?h=vfs-7.0.fserror v7: more cleanups of the media verification ioctl, improve comments, and reuse the bio v6: fix pi-breaking bugs, make verify failures trigger health reports and filter bio status flags better v5: add verify-media ioctl, collapse small helper funcs with only one caller v4: drop multiple client support so we can make direct calls into healthmon instead of chasing pointers and doing indirect calls v3: drag out of rfc status With a bit of luck, this should all go splendidly. Conflicts: This merge required an update on files: - fs/xfs/xfs_healthmon.c - fs/xfs/xfs_verify_media.c Such change was required because a parallel developement changed XFS header file xfs.h naming to xfs_platform.h, so the merge required to update those includes in both files above Signed-off-by: "Darrick J. Wong" <djwong@kernel.org> Signed-off-by: Carlos Maiolino <cem@kernel.org> 2026-01-20xfs: add media verification ioctlDarrick J. Wong Add a new privileged ioctl so that xfs_scrub can ask the kernel to verify the media of the devices backing an xfs filesystem, and have any resulting media errors reported to fsnotify and xfs_healer. To accomplish this, the kernel allocates a folio between the base page size and 1MB, and issues read IOs to a gradually incrementing range of one of the storage devices underlying an xfs filesystem. If any error occurs, that raw error is reported to the calling process. If the error happens to be one of the ones that the kernel considers indicative of data loss, then it will also be reported to xfs_healthmon and fsnotify. Driving the verification from the kernel enables xfs (and by extension xfs_scrub) to have precise control over the size and error handling of IOs that are issued to the underlying block device, and to emit notifications about problems to other relevant kernel subsystems immediately. Note that the caller is also allowed to reduce the size of the IO and to ask for a relaxation period after each IO. Signed-off-by: "Darrick J. Wong" <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>