diff options
Diffstat (limited to 'sys/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c')
-rw-r--r-- | sys/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/sys/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c b/sys/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c new file mode 100644 index 0000000..b965b1c --- /dev/null +++ b/sys/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c @@ -0,0 +1,363 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2006 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <sys/zfs_context.h> +#include <sys/spa.h> +#include <sys/vdev_disk.h> +#include <sys/vdev_impl.h> +#include <sys/fs/zfs.h> +#include <sys/zio.h> +#include <sys/sunldi.h> + +/* + * Virtual device vector for disks. + */ + +extern ldi_ident_t zfs_li; + +typedef struct vdev_disk_buf { + buf_t vdb_buf; + zio_t *vdb_io; +} vdev_disk_buf_t; + +static int +vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) +{ + vdev_disk_t *dvd; + struct dk_minfo dkm; + int error; + + /* + * We must have a pathname, and it must be absolute. + */ + if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { + vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; + return (EINVAL); + } + + dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP); + + /* + * When opening a disk device, we want to preserve the user's original + * intent. We always want to open the device by the path the user gave + * us, even if it is one of multiple paths to the save device. But we + * also want to be able to survive disks being removed/recabled. + * Therefore the sequence of opening devices is: + * + * 1. Try opening the device by path. For legacy pools without the + * 'whole_disk' property, attempt to fix the path by appending 's0'. + * + * 2. If the devid of the device matches the stored value, return + * success. + * + * 3. Otherwise, the device may have moved. Try opening the device + * by the devid instead. + * + */ + if (vd->vdev_devid != NULL) { + if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid, + &dvd->vd_minor) != 0) { + vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; + return (EINVAL); + } + } + + error = EINVAL; /* presume failure */ + + if (vd->vdev_path != NULL) { + ddi_devid_t devid; + + if (vd->vdev_wholedisk == -1ULL) { + size_t len = strlen(vd->vdev_path) + 3; + char *buf = kmem_alloc(len, KM_SLEEP); + ldi_handle_t lh; + + (void) snprintf(buf, len, "%ss0", vd->vdev_path); + + if (ldi_open_by_name(buf, spa_mode, kcred, + &lh, zfs_li) == 0) { + spa_strfree(vd->vdev_path); + vd->vdev_path = buf; + vd->vdev_wholedisk = 1ULL; + (void) ldi_close(lh, spa_mode, kcred); + } else { + kmem_free(buf, len); + } + } + + error = ldi_open_by_name(vd->vdev_path, spa_mode, kcred, + &dvd->vd_lh, zfs_li); + + /* + * Compare the devid to the stored value. + */ + if (error == 0 && vd->vdev_devid != NULL && + ldi_get_devid(dvd->vd_lh, &devid) == 0) { + if (ddi_devid_compare(devid, dvd->vd_devid) != 0) { + error = EINVAL; + (void) ldi_close(dvd->vd_lh, spa_mode, kcred); + dvd->vd_lh = NULL; + } + ddi_devid_free(devid); + } + + /* + * If we succeeded in opening the device, but 'vdev_wholedisk' + * is not yet set, then this must be a slice. + */ + if (error == 0 && vd->vdev_wholedisk == -1ULL) + vd->vdev_wholedisk = 0; + } + + /* + * If we were unable to open by path, or the devid check fails, open by + * devid instead. + */ + if (error != 0 && vd->vdev_devid != NULL) + error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor, + spa_mode, kcred, &dvd->vd_lh, zfs_li); + + if (error) { + vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; + return (error); + } + + /* + * Determine the actual size of the device. + */ + if (ldi_get_size(dvd->vd_lh, psize) != 0) { + vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; + return (EINVAL); + } + + /* + * If we own the whole disk, try to enable disk write caching. + * We ignore errors because it's OK if we can't do it. + */ + if (vd->vdev_wholedisk == 1) { + int wce = 1; + (void) ldi_ioctl(dvd->vd_lh, DKIOCSETWCE, (intptr_t)&wce, + FKIOCTL, kcred, NULL); + } + + /* + * Determine the device's minimum transfer size. + * If the ioctl isn't supported, assume DEV_BSIZE. + */ + if (ldi_ioctl(dvd->vd_lh, DKIOCGMEDIAINFO, (intptr_t)&dkm, + FKIOCTL, kcred, NULL) != 0) + dkm.dki_lbsize = DEV_BSIZE; + + *ashift = highbit(MAX(dkm.dki_lbsize, SPA_MINBLOCKSIZE)) - 1; + + /* + * Clear the nowritecache bit, so that on a vdev_reopen() we will + * try again. + */ + vd->vdev_nowritecache = B_FALSE; + + return (0); +} + +static void +vdev_disk_close(vdev_t *vd) +{ + vdev_disk_t *dvd = vd->vdev_tsd; + + if (dvd == NULL) + return; + + dprintf("removing disk %s, devid %s\n", + vd->vdev_path ? vd->vdev_path : "<none>", + vd->vdev_devid ? vd->vdev_devid : "<none>"); + + if (dvd->vd_minor != NULL) + ddi_devid_str_free(dvd->vd_minor); + + if (dvd->vd_devid != NULL) + ddi_devid_free(dvd->vd_devid); + + if (dvd->vd_lh != NULL) + (void) ldi_close(dvd->vd_lh, spa_mode, kcred); + + kmem_free(dvd, sizeof (vdev_disk_t)); + vd->vdev_tsd = NULL; +} + +static void +vdev_disk_io_intr(buf_t *bp) +{ + vdev_disk_buf_t *vdb = (vdev_disk_buf_t *)bp; + zio_t *zio = vdb->vdb_io; + + if ((zio->io_error = geterror(bp)) == 0 && bp->b_resid != 0) + zio->io_error = EIO; + + kmem_free(vdb, sizeof (vdev_disk_buf_t)); + + zio_next_stage_async(zio); +} + +static void +vdev_disk_ioctl_done(void *zio_arg, int error) +{ + zio_t *zio = zio_arg; + + zio->io_error = error; + + zio_next_stage_async(zio); +} + +static void +vdev_disk_io_start(zio_t *zio) +{ + vdev_t *vd = zio->io_vd; + vdev_disk_t *dvd = vd->vdev_tsd; + vdev_disk_buf_t *vdb; + buf_t *bp; + int flags, error; + + if (zio->io_type == ZIO_TYPE_IOCTL) { + zio_vdev_io_bypass(zio); + + /* XXPOLICY */ + if (vdev_is_dead(vd)) { + zio->io_error = ENXIO; + zio_next_stage_async(zio); + return; + } + + switch (zio->io_cmd) { + + case DKIOCFLUSHWRITECACHE: + + if (zfs_nocacheflush) + break; + + if (vd->vdev_nowritecache) { + zio->io_error = ENOTSUP; + break; + } + + zio->io_dk_callback.dkc_callback = vdev_disk_ioctl_done; + zio->io_dk_callback.dkc_cookie = zio; + + error = ldi_ioctl(dvd->vd_lh, zio->io_cmd, + (uintptr_t)&zio->io_dk_callback, + FKIOCTL, kcred, NULL); + + if (error == 0) { + /* + * The ioctl will be done asychronously, + * and will call vdev_disk_ioctl_done() + * upon completion. + */ + return; + } else if (error == ENOTSUP) { + /* + * If we get ENOTSUP, we know that no future + * attempts will ever succeed. In this case we + * set a persistent bit so that we don't bother + * with the ioctl in the future. + */ + vd->vdev_nowritecache = B_TRUE; + } + zio->io_error = error; + + break; + + default: + zio->io_error = ENOTSUP; + } + + zio_next_stage_async(zio); + return; + } + + if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) + return; + + if ((zio = vdev_queue_io(zio)) == NULL) + return; + + flags = (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE); + flags |= B_BUSY | B_NOCACHE; + if (zio->io_flags & ZIO_FLAG_FAILFAST) + flags |= B_FAILFAST; + + vdb = kmem_alloc(sizeof (vdev_disk_buf_t), KM_SLEEP); + + vdb->vdb_io = zio; + bp = &vdb->vdb_buf; + + bioinit(bp); + bp->b_flags = flags; + bp->b_bcount = zio->io_size; + bp->b_un.b_addr = zio->io_data; + bp->b_lblkno = lbtodb(zio->io_offset); + bp->b_bufsize = zio->io_size; + bp->b_iodone = (int (*)())vdev_disk_io_intr; + + /* XXPOLICY */ + error = vdev_is_dead(vd) ? ENXIO : vdev_error_inject(vd, zio); + if (error) { + zio->io_error = error; + bioerror(bp, error); + bp->b_resid = bp->b_bcount; + bp->b_iodone(bp); + return; + } + + error = ldi_strategy(dvd->vd_lh, bp); + /* ldi_strategy() will return non-zero only on programming errors */ + ASSERT(error == 0); +} + +static void +vdev_disk_io_done(zio_t *zio) +{ + vdev_queue_io_done(zio); + + if (zio->io_type == ZIO_TYPE_WRITE) + vdev_cache_write(zio); + + if (zio_injection_enabled && zio->io_error == 0) + zio->io_error = zio_handle_device_injection(zio->io_vd, EIO); + + zio_next_stage(zio); +} + +vdev_ops_t vdev_disk_ops = { + vdev_disk_open, + vdev_disk_close, + vdev_default_asize, + vdev_disk_io_start, + vdev_disk_io_done, + NULL, + VDEV_TYPE_DISK, /* name of this vdev type */ + B_TRUE /* leaf vdev */ +}; |