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22c8c33a58
In several places abd_zero() cleaned ABD filled at the next line. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15514
134 lines
3.6 KiB
C
134 lines
3.6 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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#include <sys/zfs_context.h>
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#include <sys/spa.h>
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#include <sys/spa_impl.h>
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#include <sys/dmu.h>
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#include <sys/zap.h>
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#include <sys/vdev.h>
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#include <sys/vdev_os.h>
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#include <sys/vdev_impl.h>
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#include <sys/uberblock_impl.h>
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#include <sys/metaslab.h>
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#include <sys/metaslab_impl.h>
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#include <sys/zio.h>
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#include <sys/dsl_scan.h>
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#include <sys/abd.h>
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#include <sys/fs/zfs.h>
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int
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vdev_label_write_pad2(vdev_t *vd, const char *buf, size_t size)
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{
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spa_t *spa = vd->vdev_spa;
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zio_t *zio;
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abd_t *pad2;
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int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL;
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int error;
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if (size > VDEV_PAD_SIZE)
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return (EINVAL);
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if (!vd->vdev_ops->vdev_op_leaf)
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return (ENODEV);
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if (vdev_is_dead(vd))
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return (ENXIO);
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ASSERT3U(spa_config_held(spa, SCL_ALL, RW_WRITER), ==, SCL_ALL);
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pad2 = abd_alloc_for_io(VDEV_PAD_SIZE, B_TRUE);
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abd_copy_from_buf(pad2, buf, size);
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abd_zero_off(pad2, size, VDEV_PAD_SIZE - size);
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retry:
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zio = zio_root(spa, NULL, NULL, flags);
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vdev_label_write(zio, vd, 0, pad2,
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offsetof(vdev_label_t, vl_be),
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VDEV_PAD_SIZE, NULL, NULL, flags);
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error = zio_wait(zio);
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if (error != 0 && !(flags & ZIO_FLAG_TRYHARD)) {
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flags |= ZIO_FLAG_TRYHARD;
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goto retry;
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}
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abd_free(pad2);
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return (error);
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}
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static void
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vdev_child_done(zio_t *zio)
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{
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zio_t *pio = zio->io_private;
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mutex_enter(&pio->io_lock);
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pio->io_error = zio_worst_error(pio->io_error, zio->io_error);
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mutex_exit(&pio->io_lock);
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}
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/*
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* Check if the reserved boot area is in-use.
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*
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* When booting FreeBSD with an MBR partition with ZFS, the zfsboot file
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* (which understands the ZFS file system) is written to the ZFS BOOT
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* reserve area (at offset 512K). We check for that here before attaching
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* a disk to raidz which would then corrupt this boot data.
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*/
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int
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vdev_check_boot_reserve(spa_t *spa, vdev_t *childvd)
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{
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ASSERT(childvd->vdev_ops->vdev_op_leaf);
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size_t size = SPA_MINBLOCKSIZE;
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abd_t *abd = abd_alloc_linear(size, B_FALSE);
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zio_t *pio = zio_root(spa, NULL, NULL, 0);
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/*
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* Note: zio_vdev_child_io() adds VDEV_LABEL_START_SIZE to the offset
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* to calculate the physical offset to write to. Passing in a negative
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* offset lets us access the boot area.
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*/
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zio_nowait(zio_vdev_child_io(pio, NULL, childvd,
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VDEV_BOOT_OFFSET - VDEV_LABEL_START_SIZE, abd, size, ZIO_TYPE_READ,
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ZIO_PRIORITY_ASYNC_READ, 0, vdev_child_done, pio));
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zio_wait(pio);
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unsigned char *buf = abd_to_buf(abd);
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/*
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* The BTX server has a special header at the begining.
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*
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* btx_hdr: .byte 0xeb # Machine ID
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* .byte 0xe # Header size
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* .ascii "BTX" # Magic
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* .byte 0x1 # Major version
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* .byte 0x2 # Minor version
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* .byte BTX_FLAGS # Flags
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*/
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if (buf[0] == 0xeb && buf[1] == 0x0e &&
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buf[2] == 'B' && buf[3] == 'T' && buf[4] == 'X') {
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abd_free(abd);
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return (EBUSY);
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}
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abd_free(abd);
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return (0);
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}
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