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e06be58641
This commit fixes a sign extension bug affecting l2arc devices. Extremely
large offsets may be passed down to the low level block device driver on
reads, generating errors similar to
attempt to access beyond end of device
sdbi1: rw=14, want=36028797014862705, limit=125026959
The unwanted sign extension occurrs because the function arc_read_nolock()
stores the offset as a daddr_t, a 32-bit signed int type in the Linux kernel.
This offset is then passed to zio_read_phys() as a uint64_t argument, causing
sign extension for values of 0x80000000 or greater. To avoid this, we store
the offset in a uint64_t.
This change also changes a few daddr_t struct members to uint64_t in the libspl
headers to avoid similar bugs cropping up in the future. We also add an ASSERT
to __vdev_disk_physio() to check for invalid offsets.
Closes #66
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
269 lines
8.3 KiB
C
269 lines
8.3 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, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* 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 http://www.opensolaris.org/os/licensing.
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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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/*
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* Copyright 1990-2002 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _SYS_DKLABEL_H
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#define _SYS_DKLABEL_H
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#include <sys/isa_defs.h>
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#include <sys/types32.h>
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#include <sys/isa_defs.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Miscellaneous defines
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*/
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#define DKL_MAGIC 0xDABE /* magic number */
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#define FKL_MAGIC 0xff /* magic number for DOS floppies */
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#if defined(_SUNOS_VTOC_16)
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#define NDKMAP 16 /* # of logical partitions */
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#define DK_LABEL_LOC 1 /* location of disk label */
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#elif defined(_SUNOS_VTOC_8)
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#define NDKMAP 8 /* # of logical partitions */
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#define DK_LABEL_LOC 0 /* location of disk label */
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#else
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#error "No VTOC format defined."
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#endif
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#define LEN_DKL_ASCII 128 /* length of dkl_asciilabel */
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#define LEN_DKL_VVOL 8 /* length of v_volume */
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#define DK_LABEL_SIZE 512 /* size of disk label */
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#define DK_MAX_BLOCKS 0x7fffffff /* max # of blocks handled */
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/*
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* Reserve two cylinders on SCSI disks.
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* One is for the backup disk label and the other is for the deviceid.
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*
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* IPI disks only reserve one cylinder, but they will go away soon.
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* CDROMs do not reserve any cylinders.
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*/
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#define DK_ACYL 2
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/*
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* Format of a Sun disk label.
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* Resides in cylinder 0, head 0, sector 0.
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*
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* sizeof (struct dk_label) should be 512 (the current sector size),
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* but should the sector size increase, this structure should remain
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* at the beginning of the sector.
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*/
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/*
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* partition headers: section 1
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* Returned in struct dk_allmap by ioctl DKIOC[SG]APART (dkio(7I))
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*/
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struct dk_map {
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uint64_t dkl_cylno; /* starting cylinder */
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uint64_t dkl_nblk; /* number of blocks; if == 0, */
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/* partition is undefined */
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};
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/*
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* partition headers: section 1
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* Fixed size for on-disk dk_label
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*/
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struct dk_map32 {
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daddr32_t dkl_cylno; /* starting cylinder */
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daddr32_t dkl_nblk; /* number of blocks; if == 0, */
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/* partition is undefined */
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};
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/*
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* partition headers: section 2,
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* brought over from AT&T SVr4 vtoc structure.
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*/
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struct dk_map2 {
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uint16_t p_tag; /* ID tag of partition */
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uint16_t p_flag; /* permission flag */
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};
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struct dkl_partition {
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uint16_t p_tag; /* ID tag of partition */
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uint16_t p_flag; /* permision flags */
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daddr32_t p_start; /* start sector no of partition */
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int32_t p_size; /* # of blocks in partition */
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};
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/*
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* VTOC inclusions from AT&T SVr4
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* Fixed sized types for on-disk VTOC
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*/
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struct dk_vtoc {
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#if defined(_SUNOS_VTOC_16)
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uint32_t v_bootinfo[3]; /* info for mboot (unsupported) */
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uint32_t v_sanity; /* to verify vtoc sanity */
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uint32_t v_version; /* layout version */
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char v_volume[LEN_DKL_VVOL]; /* volume name */
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uint16_t v_sectorsz; /* sector size in bytes */
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uint16_t v_nparts; /* number of partitions */
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uint32_t v_reserved[10]; /* free space */
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struct dkl_partition v_part[NDKMAP]; /* partition headers */
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time32_t timestamp[NDKMAP]; /* partition timestamp (unsupported) */
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char v_asciilabel[LEN_DKL_ASCII]; /* for compatibility */
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#elif defined(_SUNOS_VTOC_8)
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uint32_t v_version; /* layout version */
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char v_volume[LEN_DKL_VVOL]; /* volume name */
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uint16_t v_nparts; /* number of partitions */
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struct dk_map2 v_part[NDKMAP]; /* partition hdrs, sec 2 */
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uint32_t v_bootinfo[3]; /* info needed by mboot */
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uint32_t v_sanity; /* to verify vtoc sanity */
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uint32_t v_reserved[10]; /* free space */
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time32_t v_timestamp[NDKMAP]; /* partition timestamp */
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#else
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#error "No VTOC format defined."
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#endif
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};
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/*
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* define the amount of disk label padding needed to make
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* the entire structure occupy 512 bytes.
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*/
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#if defined(_SUNOS_VTOC_16)
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#define LEN_DKL_PAD (DK_LABEL_SIZE - \
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((sizeof (struct dk_vtoc) + \
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(4 * sizeof (uint32_t)) + \
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(12 * sizeof (uint16_t)) + \
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(2 * (sizeof (uint16_t))))))
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#elif defined(_SUNOS_VTOC_8)
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#define LEN_DKL_PAD (DK_LABEL_SIZE \
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- ((LEN_DKL_ASCII) + \
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(sizeof (struct dk_vtoc)) + \
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(sizeof (struct dk_map32) * NDKMAP) + \
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(14 * (sizeof (uint16_t))) + \
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(2 * (sizeof (uint16_t)))))
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#else
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#error "No VTOC format defined."
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#endif
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struct dk_label {
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#if defined(_SUNOS_VTOC_16)
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struct dk_vtoc dkl_vtoc; /* vtoc inclusions from AT&T SVr4 */
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uint32_t dkl_pcyl; /* # of physical cylinders */
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uint32_t dkl_ncyl; /* # of data cylinders */
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uint16_t dkl_acyl; /* # of alternate cylinders */
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uint16_t dkl_bcyl; /* cyl offset (for fixed head area) */
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uint32_t dkl_nhead; /* # of heads */
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uint32_t dkl_nsect; /* # of data sectors per track */
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uint16_t dkl_intrlv; /* interleave factor */
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uint16_t dkl_skew; /* skew factor */
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uint16_t dkl_apc; /* alternates per cyl (SCSI only) */
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uint16_t dkl_rpm; /* revolutions per minute */
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uint16_t dkl_write_reinstruct; /* # sectors to skip, writes */
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uint16_t dkl_read_reinstruct; /* # sectors to skip, reads */
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uint16_t dkl_extra[4]; /* for compatible expansion */
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char dkl_pad[LEN_DKL_PAD]; /* unused part of 512 bytes */
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#elif defined(_SUNOS_VTOC_8)
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char dkl_asciilabel[LEN_DKL_ASCII]; /* for compatibility */
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struct dk_vtoc dkl_vtoc; /* vtoc inclusions from AT&T SVr4 */
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uint16_t dkl_write_reinstruct; /* # sectors to skip, writes */
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uint16_t dkl_read_reinstruct; /* # sectors to skip, reads */
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char dkl_pad[LEN_DKL_PAD]; /* unused part of 512 bytes */
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uint16_t dkl_rpm; /* rotations per minute */
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uint16_t dkl_pcyl; /* # physical cylinders */
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uint16_t dkl_apc; /* alternates per cylinder */
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uint16_t dkl_obs1; /* obsolete */
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uint16_t dkl_obs2; /* obsolete */
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uint16_t dkl_intrlv; /* interleave factor */
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uint16_t dkl_ncyl; /* # of data cylinders */
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uint16_t dkl_acyl; /* # of alternate cylinders */
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uint16_t dkl_nhead; /* # of heads in this partition */
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uint16_t dkl_nsect; /* # of 512 byte sectors per track */
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uint16_t dkl_obs3; /* obsolete */
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uint16_t dkl_obs4; /* obsolete */
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struct dk_map32 dkl_map[NDKMAP]; /* logical partition headers */
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#else
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#error "No VTOC format defined."
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#endif
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uint16_t dkl_magic; /* identifies this label format */
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uint16_t dkl_cksum; /* xor checksum of sector */
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};
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#if defined(_SUNOS_VTOC_16)
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#define dkl_asciilabel dkl_vtoc.v_asciilabel
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#define v_timestamp timestamp
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#elif defined(_SUNOS_VTOC_8)
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/*
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* These defines are for historic compatibility with old drivers.
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*/
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#define dkl_gap1 dkl_obs1 /* used to be gap1 */
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#define dkl_gap2 dkl_obs2 /* used to be gap2 */
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#define dkl_bhead dkl_obs3 /* used to be label head offset */
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#define dkl_ppart dkl_obs4 /* used to by physical partition */
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#else
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#error "No VTOC format defined."
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#endif
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struct fk_label { /* DOS floppy label */
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uchar_t fkl_type;
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uchar_t fkl_magich;
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uchar_t fkl_magicl;
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uchar_t filler;
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};
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/*
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* Layout of stored fabricated device id (on-disk)
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*/
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#define DK_DEVID_BLKSIZE (512)
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#define DK_DEVID_SIZE (DK_DEVID_BLKSIZE - ((sizeof (uchar_t) * 7)))
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#define DK_DEVID_REV_MSB (0)
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#define DK_DEVID_REV_LSB (1)
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struct dk_devid {
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uchar_t dkd_rev_hi; /* revision (MSB) */
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uchar_t dkd_rev_lo; /* revision (LSB) */
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uchar_t dkd_flags; /* flags (not used yet) */
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uchar_t dkd_devid[DK_DEVID_SIZE]; /* devid stored here */
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uchar_t dkd_checksum3; /* checksum (MSB) */
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uchar_t dkd_checksum2;
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uchar_t dkd_checksum1;
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uchar_t dkd_checksum0; /* checksum (LSB) */
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};
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#define DKD_GETCHKSUM(dkd) ((dkd)->dkd_checksum3 << 24) + \
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((dkd)->dkd_checksum2 << 16) + \
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((dkd)->dkd_checksum1 << 8) + \
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((dkd)->dkd_checksum0)
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#define DKD_FORMCHKSUM(c, dkd) (dkd)->dkd_checksum3 = hibyte(hiword((c))); \
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(dkd)->dkd_checksum2 = lobyte(hiword((c))); \
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(dkd)->dkd_checksum1 = hibyte(loword((c))); \
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(dkd)->dkd_checksum0 = lobyte(loword((c)));
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_DKLABEL_H */
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