Implement database to workaround misreported physical sector sizes

This implements vdev_bdev_database_check(). It alters the detected
sector size of any device listed in a database of drives known to lie
about their physical sector sizes.

This is based on "6931570 Add flash devices' VID/PID to disk table to
advertising 4K physical sector size" from Open Solaris and on
sg_simple4.c from sg3_utils. About two dozen lines are taken from
sg_simple4.c, which is GPLv2 licensed. However, sg_simple4.c is
analogous to a Hello World program and is safe for us to use. We
requested that Douglas Gilbert, the author of sg_simple4.c, confirm that
this is the case. A cutdown version of his response is as follows:

```
I would consider a SCSI INQUIRY example using the Linux sg
driver interface (also written by me) as the equivalent of an
"hello world" program in C.
```

The database was created with the help of the freenode and ZFSOnLinux
communities.

Some notes:

1. The following drives both were confirmed to lie via reports in IRC
and they contain capacity information in their identifiers:

INTEL SSDSA2M080
INTEL SSDSA2M160
M4-CT256M4SSD2
WDC WD15EARS-00S
WDC WD15EARS-00Z
WDC WD20EARS-00M

The identifiers for different capacity models were extrapolated and
added under the assumption that those models also lie. Google was used
to verify that the extrapolated drive identifiers existed prior to their
inclusion.

2. The OCZ-VERTEX2 3.5 identifer applies to two drives that differ
solely in page size (and slightly in capacity). One uses 4096-byte pages
and the other uses 8192-byte pages. Both are set to use 8192-byte pages.
We could detect the page size by checking the capacity, but that would
unnecessarily complicate the code.

3. It is possible for updated drive firmware to correctly report the
sector size. There were reports of a few advanced format drives doing
that. One report stated that the vendor changed the identification
string while another was unclear on this. Both reports involved WDC
models.

4. Google was used to determine the size of pages in the listed flash
devices. Reports of 8192-byte pages took precedence over reports of
4096-byte pages.

5. Devices behind USB adapters can have their identification strings
altered. Identification strings obtained across USB adapters are
omitted and no attempt is made to correct for alterations made by USB
adapters when doing comparisons against the database. Two entries in the
Open Solaris database that appear to have been altered by a USB
adapter were omitted.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1652

diff --git a/cmd/zpool/zpool_vdev.c b/cmd/zpool/zpool_vdev.c
index b0b17b1..723e10b 100644 (file)
--- a/cmd/zpool/zpool_vdev.c
+++ b/cmd/zpool/zpool_vdev.c
@@ -67,6 +67,8 @@
 #include <libintl.h>
 #include <libnvpair.h>
 #include <limits.h>
+#include <scsi/scsi.h>
+#include <scsi/sg.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
@@ -82,6 +84,7 @@
 #endif /* HAVE_LIBBLKID */
 
 #include "zpool_util.h"
+#include <sys/zfs_context.h>
 
 /*
  * For any given vdev specification, we can have multiple errors.  The
@@ -91,6 +94,115 @@
 boolean_t error_seen;
 boolean_t is_force;
 
+typedef struct vdev_disk_db_entry
+{
+       char id[24];
+       int sector_size;
+} vdev_disk_db_entry_t;
+
+/*
+ * Database of block devices that lie about physical sector sizes.  The
+ * identification string must be precisely 24 characters to avoid false
+ * negatives
+ */
+static vdev_disk_db_entry_t vdev_disk_database[] = {
+       {"ATA     Corsair Force 3 ", 8192},
+       {"ATA     INTEL SSDSA2CT04", 8192},
+       {"ATA     INTEL SSDSA2CW16", 8192},
+       {"ATA     INTEL SSDSC2CT18", 8192},
+       {"ATA     INTEL SSDSC2CW12", 8192},
+       {"ATA     KINGSTON SH100S3", 8192},
+       {"ATA     M4-CT064M4SSD2  ", 8192},
+       {"ATA     M4-CT128M4SSD2  ", 8192},
+       {"ATA     M4-CT256M4SSD2  ", 8192},
+       {"ATA     M4-CT512M4SSD2  ", 8192},
+       {"ATA     OCZ-AGILITY2    ", 8192},
+       {"ATA     OCZ-VERTEX2 3.5 ", 8192},
+       {"ATA     OCZ-VERTEX3     ", 8192},
+       {"ATA     OCZ-VERTEX3 LT  ", 8192},
+       {"ATA     OCZ-VERTEX3 MI  ", 8192},
+       {"ATA     SAMSUNG SSD 830 ", 8192},
+       {"ATA     Samsung SSD 840 ", 8192},
+       {"ATA     INTEL SSDSA2M040", 4096},
+       {"ATA     INTEL SSDSA2M080", 4096},
+       {"ATA     INTEL SSDSA2M160", 4096},
+       /* Imported from Open Solaris*/
+       {"ATA     MARVELL SD88SA02", 4096},
+       /* Advanced format Hard drives */
+       {"ATA     Hitachi HDS5C303", 4096},
+       {"ATA     SAMSUNG HD204UI ", 4096},
+       {"ATA     ST2000DL004 HD20", 4096},
+       {"ATA     WDC WD10EARS-00M", 4096},
+       {"ATA     WDC WD10EARS-00S", 4096},
+       {"ATA     WDC WD10EARS-00Z", 4096},
+       {"ATA     WDC WD15EARS-00M", 4096},
+       {"ATA     WDC WD15EARS-00S", 4096},
+       {"ATA     WDC WD15EARS-00Z", 4096},
+       {"ATA     WDC WD20EARS-00M", 4096},
+       {"ATA     WDC WD20EARS-00S", 4096},
+       {"ATA     WDC WD20EARS-00Z", 4096},
+       /* Virtual disks: Assume zvols with default volblocksize */
+#if 0
+       {"ATA     QEMU HARDDISK   ", 8192},
+       {"IET     VIRTUAL-DISK    ", 8192},
+       {"OI      COMSTAR         ", 8192},
+#endif
+};
+
+static const int vdev_disk_database_size =
+       sizeof (vdev_disk_database) / sizeof (vdev_disk_database[0]);
+
+#define        INQ_REPLY_LEN   96
+#define        INQ_CMD_LEN     6
+
+static boolean_t
+check_sector_size_database(char *path, int *sector_size)
+{
+       unsigned char inq_buff[INQ_REPLY_LEN];
+       unsigned char sense_buffer[32];
+       unsigned char inq_cmd_blk[INQ_CMD_LEN] =
+           {INQUIRY, 0, 0, 0, INQ_REPLY_LEN, 0};
+       sg_io_hdr_t io_hdr;
+       int error;
+       int fd;
+       int i;
+
+       /* Prepare INQUIRY command */
+       memset(&io_hdr, 0, sizeof(sg_io_hdr_t));
+       io_hdr.interface_id = 'S';
+       io_hdr.cmd_len = sizeof(inq_cmd_blk);
+       io_hdr.mx_sb_len = sizeof(sense_buffer);
+       io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
+       io_hdr.dxfer_len = INQ_REPLY_LEN;
+       io_hdr.dxferp = inq_buff;
+       io_hdr.cmdp = inq_cmd_blk;
+       io_hdr.sbp = sense_buffer;
+       io_hdr.timeout = 10;        /* 10 milliseconds is ample time */
+
+       if ((fd = open(path, O_RDONLY|O_DIRECT)) < 0)
+               return (B_FALSE);
+
+       error = ioctl(fd, SG_IO, (unsigned long) &io_hdr);
+
+       (void) close(fd);
+
+       if (error < 0)
+               return (B_FALSE);
+
+       if ((io_hdr.info & SG_INFO_OK_MASK) != SG_INFO_OK)
+               return (B_FALSE);
+
+       for (i = 0; i < vdev_disk_database_size; i++) {
+               if (memcmp(inq_buff + 8, vdev_disk_database[i].id, 24))
+                       continue;
+
+               *sector_size = vdev_disk_database[i].sector_size;
+               return (B_TRUE);
+       }
+
+       return (B_FALSE);
+}
+
 /*PRINTFLIKE1*/
 static void
 vdev_error(const char *fmt, ...)
@@ -459,6 +571,7 @@ make_leaf_vdev(nvlist_t *props, const char *arg, uint64_t is_log)
        nvlist_t *vdev = NULL;
        char *type = NULL;
        boolean_t wholedisk = B_FALSE;
+       uint64_t ashift = 0;
        int err;
 
        /*
@@ -544,19 +657,31 @@ make_leaf_vdev(nvlist_t *props, const char *arg, uint64_t is_log)
                verify(nvlist_add_uint64(vdev, ZPOOL_CONFIG_WHOLE_DISK,
                    (uint64_t)wholedisk) == 0);
 
+       /*
+        * Override defaults if custom properties are provided.
+        */
        if (props != NULL) {
-               uint64_t ashift = 0;
                char *value = NULL;
 
                if (nvlist_lookup_string(props,
                    zpool_prop_to_name(ZPOOL_PROP_ASHIFT), &value) == 0)
                        zfs_nicestrtonum(NULL, value, &ashift);
+       }
 
-               if (ashift > 0)
-                       verify(nvlist_add_uint64(vdev, ZPOOL_CONFIG_ASHIFT,
-                           ashift) == 0);
+       /*
+        * If the device is known to incorrectly report its physical sector
+        * size explicitly provide the known correct value.
+        */
+       if (ashift == 0) {
+               int sector_size;
+
+               if (check_sector_size_database(path, &sector_size) == B_TRUE)
+                       ashift = highbit(sector_size) - 1;
        }
 
+       if (ashift > 0)
+               nvlist_add_uint64(vdev, ZPOOL_CONFIG_ASHIFT, ashift);
+
        return (vdev);
 }