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path: root/uts/common/fs/zfs/vdev_disk.c
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Diffstat (limited to 'uts/common/fs/zfs/vdev_disk.c')
-rw-r--r--uts/common/fs/zfs/vdev_disk.c610
1 files changed, 610 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/vdev_disk.c b/uts/common/fs/zfs/vdev_disk.c
new file mode 100644
index 000000000000..d7417736b4ee
--- /dev/null
+++ b/uts/common/fs/zfs/vdev_disk.c
@@ -0,0 +1,610 @@
+/*
+ * 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#include <sys/zfs_context.h>
+#include <sys/spa_impl.h>
+#include <sys/refcount.h>
+#include <sys/vdev_disk.h>
+#include <sys/vdev_impl.h>
+#include <sys/fs/zfs.h>
+#include <sys/zio.h>
+#include <sys/sunldi.h>
+#include <sys/fm/fs/zfs.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 void
+vdev_disk_hold(vdev_t *vd)
+{
+ ddi_devid_t devid;
+ char *minor;
+
+ ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER));
+
+ /*
+ * We must have a pathname, and it must be absolute.
+ */
+ if (vd->vdev_path == NULL || vd->vdev_path[0] != '/')
+ return;
+
+ /*
+ * Only prefetch path and devid info if the device has
+ * never been opened.
+ */
+ if (vd->vdev_tsd != NULL)
+ return;
+
+ if (vd->vdev_wholedisk == -1ULL) {
+ size_t len = strlen(vd->vdev_path) + 3;
+ char *buf = kmem_alloc(len, KM_SLEEP);
+
+ (void) snprintf(buf, len, "%ss0", vd->vdev_path);
+
+ (void) ldi_vp_from_name(buf, &vd->vdev_name_vp);
+ kmem_free(buf, len);
+ }
+
+ if (vd->vdev_name_vp == NULL)
+ (void) ldi_vp_from_name(vd->vdev_path, &vd->vdev_name_vp);
+
+ if (vd->vdev_devid != NULL &&
+ ddi_devid_str_decode(vd->vdev_devid, &devid, &minor) == 0) {
+ (void) ldi_vp_from_devid(devid, minor, &vd->vdev_devid_vp);
+ ddi_devid_str_free(minor);
+ ddi_devid_free(devid);
+ }
+}
+
+static void
+vdev_disk_rele(vdev_t *vd)
+{
+ ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER));
+
+ if (vd->vdev_name_vp) {
+ VN_RELE_ASYNC(vd->vdev_name_vp,
+ dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool));
+ vd->vdev_name_vp = NULL;
+ }
+ if (vd->vdev_devid_vp) {
+ VN_RELE_ASYNC(vd->vdev_devid_vp,
+ dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool));
+ vd->vdev_devid_vp = NULL;
+ }
+}
+
+static int
+vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)
+{
+ spa_t *spa = vd->vdev_spa;
+ vdev_disk_t *dvd;
+ struct dk_minfo_ext dkmext;
+ int error;
+ dev_t dev;
+ int otyp;
+
+ /*
+ * 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);
+ }
+
+ /*
+ * Reopen the device if it's not currently open. Otherwise,
+ * just update the physical size of the device.
+ */
+ if (vd->vdev_tsd != NULL) {
+ ASSERT(vd->vdev_reopening);
+ dvd = vd->vdev_tsd;
+ goto skip_open;
+ }
+
+ 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(spa), kcred,
+ &lh, zfs_li) == 0) {
+ spa_strfree(vd->vdev_path);
+ vd->vdev_path = buf;
+ vd->vdev_wholedisk = 1ULL;
+ (void) ldi_close(lh, spa_mode(spa), kcred);
+ } else {
+ kmem_free(buf, len);
+ }
+ }
+
+ error = ldi_open_by_name(vd->vdev_path, spa_mode(spa), 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(spa),
+ 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(spa), kcred, &dvd->vd_lh, zfs_li);
+
+ /*
+ * If all else fails, then try opening by physical path (if available)
+ * or the logical path (if we failed due to the devid check). While not
+ * as reliable as the devid, this will give us something, and the higher
+ * level vdev validation will prevent us from opening the wrong device.
+ */
+ if (error) {
+ if (vd->vdev_physpath != NULL &&
+ (dev = ddi_pathname_to_dev_t(vd->vdev_physpath)) != NODEV)
+ error = ldi_open_by_dev(&dev, OTYP_BLK, spa_mode(spa),
+ kcred, &dvd->vd_lh, zfs_li);
+
+ /*
+ * Note that we don't support the legacy auto-wholedisk support
+ * as above. This hasn't been used in a very long time and we
+ * don't need to propagate its oddities to this edge condition.
+ */
+ if (error && vd->vdev_path != NULL)
+ error = ldi_open_by_name(vd->vdev_path, spa_mode(spa),
+ kcred, &dvd->vd_lh, zfs_li);
+ }
+
+ if (error) {
+ vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
+ return (error);
+ }
+
+ /*
+ * Once a device is opened, verify that the physical device path (if
+ * available) is up to date.
+ */
+ if (ldi_get_dev(dvd->vd_lh, &dev) == 0 &&
+ ldi_get_otyp(dvd->vd_lh, &otyp) == 0) {
+ char *physpath, *minorname;
+
+ physpath = kmem_alloc(MAXPATHLEN, KM_SLEEP);
+ minorname = NULL;
+ if (ddi_dev_pathname(dev, otyp, physpath) == 0 &&
+ ldi_get_minor_name(dvd->vd_lh, &minorname) == 0 &&
+ (vd->vdev_physpath == NULL ||
+ strcmp(vd->vdev_physpath, physpath) != 0)) {
+ if (vd->vdev_physpath)
+ spa_strfree(vd->vdev_physpath);
+ (void) strlcat(physpath, ":", MAXPATHLEN);
+ (void) strlcat(physpath, minorname, MAXPATHLEN);
+ vd->vdev_physpath = spa_strdup(physpath);
+ }
+ if (minorname)
+ kmem_free(minorname, strlen(minorname) + 1);
+ kmem_free(physpath, MAXPATHLEN);
+ }
+
+skip_open:
+ /*
+ * 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, DKIOCGMEDIAINFOEXT, (intptr_t)&dkmext,
+ FKIOCTL, kcred, NULL) != 0)
+ dkmext.dki_pbsize = DEV_BSIZE;
+
+ *ashift = highbit(MAX(dkmext.dki_pbsize, 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 (vd->vdev_reopening || dvd == NULL)
+ return;
+
+ 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(vd->vdev_spa), kcred);
+
+ vd->vdev_delayed_close = B_FALSE;
+ kmem_free(dvd, sizeof (vdev_disk_t));
+ vd->vdev_tsd = NULL;
+}
+
+int
+vdev_disk_physio(ldi_handle_t vd_lh, caddr_t data, size_t size,
+ uint64_t offset, int flags)
+{
+ buf_t *bp;
+ int error = 0;
+
+ if (vd_lh == NULL)
+ return (EINVAL);
+
+ ASSERT(flags & B_READ || flags & B_WRITE);
+
+ bp = getrbuf(KM_SLEEP);
+ bp->b_flags = flags | B_BUSY | B_NOCACHE | B_FAILFAST;
+ bp->b_bcount = size;
+ bp->b_un.b_addr = (void *)data;
+ bp->b_lblkno = lbtodb(offset);
+ bp->b_bufsize = size;
+
+ error = ldi_strategy(vd_lh, bp);
+ ASSERT(error == 0);
+ if ((error = biowait(bp)) == 0 && bp->b_resid != 0)
+ error = EIO;
+ freerbuf(bp);
+
+ return (error);
+}
+
+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;
+
+ /*
+ * The rest of the zio stack only deals with EIO, ECKSUM, and ENXIO.
+ * Rather than teach the rest of the stack about other error
+ * possibilities (EFAULT, etc), we normalize the error value here.
+ */
+ zio->io_error = (geterror(bp) != 0 ? EIO : 0);
+
+ if (zio->io_error == 0 && bp->b_resid != 0)
+ zio->io_error = EIO;
+
+ kmem_free(vdb, sizeof (vdev_disk_buf_t));
+
+ zio_interrupt(zio);
+}
+
+static void
+vdev_disk_ioctl_free(zio_t *zio)
+{
+ kmem_free(zio->io_vsd, sizeof (struct dk_callback));
+}
+
+static const zio_vsd_ops_t vdev_disk_vsd_ops = {
+ vdev_disk_ioctl_free,
+ zio_vsd_default_cksum_report
+};
+
+static void
+vdev_disk_ioctl_done(void *zio_arg, int error)
+{
+ zio_t *zio = zio_arg;
+
+ zio->io_error = error;
+
+ zio_interrupt(zio);
+}
+
+static int
+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;
+ struct dk_callback *dkc;
+ buf_t *bp;
+ int error;
+
+ if (zio->io_type == ZIO_TYPE_IOCTL) {
+ /* XXPOLICY */
+ if (!vdev_readable(vd)) {
+ zio->io_error = ENXIO;
+ return (ZIO_PIPELINE_CONTINUE);
+ }
+
+ switch (zio->io_cmd) {
+
+ case DKIOCFLUSHWRITECACHE:
+
+ if (zfs_nocacheflush)
+ break;
+
+ if (vd->vdev_nowritecache) {
+ zio->io_error = ENOTSUP;
+ break;
+ }
+
+ zio->io_vsd = dkc = kmem_alloc(sizeof (*dkc), KM_SLEEP);
+ zio->io_vsd_ops = &vdev_disk_vsd_ops;
+
+ dkc->dkc_callback = vdev_disk_ioctl_done;
+ dkc->dkc_flag = FLUSH_VOLATILE;
+ dkc->dkc_cookie = zio;
+
+ error = ldi_ioctl(dvd->vd_lh, zio->io_cmd,
+ (uintptr_t)dkc, FKIOCTL, kcred, NULL);
+
+ if (error == 0) {
+ /*
+ * The ioctl will be done asychronously,
+ * and will call vdev_disk_ioctl_done()
+ * upon completion.
+ */
+ return (ZIO_PIPELINE_STOP);
+ }
+
+ if (error == ENOTSUP || error == ENOTTY) {
+ /*
+ * If we get ENOTSUP or ENOTTY, 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;
+ }
+
+ return (ZIO_PIPELINE_CONTINUE);
+ }
+
+ vdb = kmem_alloc(sizeof (vdev_disk_buf_t), KM_SLEEP);
+
+ vdb->vdb_io = zio;
+ bp = &vdb->vdb_buf;
+
+ bioinit(bp);
+ bp->b_flags = B_BUSY | B_NOCACHE |
+ (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE);
+ if (!(zio->io_flags & (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD)))
+ bp->b_flags |= B_FAILFAST;
+ 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;
+
+ /* ldi_strategy() will return non-zero only on programming errors */
+ VERIFY(ldi_strategy(dvd->vd_lh, bp) == 0);
+
+ return (ZIO_PIPELINE_STOP);
+}
+
+static void
+vdev_disk_io_done(zio_t *zio)
+{
+ vdev_t *vd = zio->io_vd;
+
+ /*
+ * If the device returned EIO, then attempt a DKIOCSTATE ioctl to see if
+ * the device has been removed. If this is the case, then we trigger an
+ * asynchronous removal of the device. Otherwise, probe the device and
+ * make sure it's still accessible.
+ */
+ if (zio->io_error == EIO && !vd->vdev_remove_wanted) {
+ vdev_disk_t *dvd = vd->vdev_tsd;
+ int state = DKIO_NONE;
+
+ if (ldi_ioctl(dvd->vd_lh, DKIOCSTATE, (intptr_t)&state,
+ FKIOCTL, kcred, NULL) == 0 && state != DKIO_INSERTED) {
+ /*
+ * We post the resource as soon as possible, instead of
+ * when the async removal actually happens, because the
+ * DE is using this information to discard previous I/O
+ * errors.
+ */
+ zfs_post_remove(zio->io_spa, vd);
+ vd->vdev_remove_wanted = B_TRUE;
+ spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE);
+ } else if (!vd->vdev_delayed_close) {
+ vd->vdev_delayed_close = B_TRUE;
+ }
+ }
+}
+
+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_disk_hold,
+ vdev_disk_rele,
+ VDEV_TYPE_DISK, /* name of this vdev type */
+ B_TRUE /* leaf vdev */
+};
+
+/*
+ * Given the root disk device devid or pathname, read the label from
+ * the device, and construct a configuration nvlist.
+ */
+int
+vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config)
+{
+ ldi_handle_t vd_lh;
+ vdev_label_t *label;
+ uint64_t s, size;
+ int l;
+ ddi_devid_t tmpdevid;
+ int error = -1;
+ char *minor_name;
+
+ /*
+ * Read the device label and build the nvlist.
+ */
+ if (devid != NULL && ddi_devid_str_decode(devid, &tmpdevid,
+ &minor_name) == 0) {
+ error = ldi_open_by_devid(tmpdevid, minor_name,
+ FREAD, kcred, &vd_lh, zfs_li);
+ ddi_devid_free(tmpdevid);
+ ddi_devid_str_free(minor_name);
+ }
+
+ if (error && (error = ldi_open_by_name(devpath, FREAD, kcred, &vd_lh,
+ zfs_li)))
+ return (error);
+
+ if (ldi_get_size(vd_lh, &s)) {
+ (void) ldi_close(vd_lh, FREAD, kcred);
+ return (EIO);
+ }
+
+ size = P2ALIGN_TYPED(s, sizeof (vdev_label_t), uint64_t);
+ label = kmem_alloc(sizeof (vdev_label_t), KM_SLEEP);
+
+ *config = NULL;
+ for (l = 0; l < VDEV_LABELS; l++) {
+ uint64_t offset, state, txg = 0;
+
+ /* read vdev label */
+ offset = vdev_label_offset(size, l, 0);
+ if (vdev_disk_physio(vd_lh, (caddr_t)label,
+ VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, B_READ) != 0)
+ continue;
+
+ if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist,
+ sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) {
+ *config = NULL;
+ continue;
+ }
+
+ if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE,
+ &state) != 0 || state >= POOL_STATE_DESTROYED) {
+ nvlist_free(*config);
+ *config = NULL;
+ continue;
+ }
+
+ if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG,
+ &txg) != 0 || txg == 0) {
+ nvlist_free(*config);
+ *config = NULL;
+ continue;
+ }
+
+ break;
+ }
+
+ kmem_free(label, sizeof (vdev_label_t));
+ (void) ldi_close(vd_lh, FREAD, kcred);
+ if (*config == NULL)
+ error = EIDRM;
+
+ return (error);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-19 05:37:46 +0000