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linux-user: Add support for btrfs ioctls used to scrub a filesystem

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This patch implements functionality for following ioctls:

BTRFS_IOC_SCRUB - Starting a btrfs filesystem scrub

    Start a btrfs filesystem scrub. The third ioctls argument
    is a pointer to a following type:

    struct btrfs_ioctl_scrub_args {
	__u64 devid;				/* in */
	__u64 start;				/* in */
	__u64 end;				/* in */
	__u64 flags;				/* in */
	struct btrfs_scrub_progress progress;	/* out */
	/* pad to 1k */
	__u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8];
    };

    Before calling this ioctl, field 'devid' should be filled
    with value that represents the device id of the btrfs filesystem
    for which the scrub is to be started.

BTRFS_IOC_SCRUB_CANCEL - Canceling scrub of a btrfs filesystem

    Cancel a btrfs filesystem scrub if it is running. The third
    ioctls argument is ignored.

BTRFS_IOC_SCRUB_PROGRESS - Getting status of a running scrub

    Read the status of a running btrfs filesystem scrub. The third
    ioctls argument is a pointer to the above mentioned
    'struct btrfs_ioctl_scrub_args'. Similarly as with 'BTRFS_IOC_SCRUB',
    the 'devid' field should be filled with value that represents the
    id of the btrfs device for which the scrub has started. The status
    of a running scrub is returned in the field 'progress' which is
    of type 'struct btrfs_scrub_progress' and its definition can be
    found at:
    https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/btrfs.h#L150

Implementation nots:

    Ioctls in this patch use type 'struct btrfs_ioctl_scrub_args' as their
    third argument. That is the reason why an aproppriate thunk type
    definition is added in file 'syscall_types.h'.

Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Tested-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200823195014.116226-9-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Filip Bozuta
2020-08-23 21:50:14 +02:00
committed by Laurent Vivier
parent 53906f689d
commit 9a5a5a0552
3 changed files with 43 additions and 0 deletions
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linux-user/syscall_types.h
+29
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@@ -425,6 +425,35 @@ STRUCT(btrfs_ioctl_ino_lookup_user_args,
MK_ARRAY(TYPE_CHAR, BTRFS_INO_LOOKUP_USER_PATH_MAX)) /* path */
#endif
#if defined(BTRFS_IOC_SCRUB) || defined(BTRFS_IOC_SCRUB_PROGRESS)
STRUCT(btrfs_scrub_progress,
TYPE_ULONGLONG, /* data_extents_scrubbed */
TYPE_ULONGLONG, /* tree_extents_scrubbed */
TYPE_ULONGLONG, /* data_bytes_scrubbed */
TYPE_ULONGLONG, /* tree_bytes_scrubbed */
TYPE_ULONGLONG, /* read_errors */
TYPE_ULONGLONG, /* csum_errors */
TYPE_ULONGLONG, /* verify_errors */
TYPE_ULONGLONG, /* no_csum */
TYPE_ULONGLONG, /* csum_discards */
TYPE_ULONGLONG, /* super_errors */
TYPE_ULONGLONG, /* malloc_errors */
TYPE_ULONGLONG, /* uncorrectable_errors */
TYPE_ULONGLONG, /* corrected_er */
TYPE_ULONGLONG, /* last_physical */
TYPE_ULONGLONG) /* unverified_errors */
STRUCT(btrfs_ioctl_scrub_args,
TYPE_ULONGLONG, /* devid */
TYPE_ULONGLONG, /* start */
TYPE_ULONGLONG, /* end */
TYPE_ULONGLONG, /* flags */
MK_STRUCT(STRUCT_btrfs_scrub_progress), /* progress */
MK_ARRAY(TYPE_ULONGLONG,
(1024 - 32 -
sizeof(struct btrfs_scrub_progress)) / 8)) /* unused */
#endif
#ifdef BTRFS_IOC_DEV_INFO
STRUCT(btrfs_ioctl_dev_info_args,
TYPE_ULONGLONG, /* devid */