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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/scsi/sd.c
Initial import
Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c3302
1 files changed, 3302 insertions, 0 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
new file mode 100644
index 000000000..7f9d65fe4
--- /dev/null
+++ b/drivers/scsi/sd.c
@@ -0,0 +1,3302 @@
+/*
+ * sd.c Copyright (C) 1992 Drew Eckhardt
+ * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
+ *
+ * Linux scsi disk driver
+ * Initial versions: Drew Eckhardt
+ * Subsequent revisions: Eric Youngdale
+ * Modification history:
+ * - Drew Eckhardt <drew@colorado.edu> original
+ * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
+ * outstanding request, and other enhancements.
+ * Support loadable low-level scsi drivers.
+ * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
+ * eight major numbers.
+ * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
+ * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
+ * sd_init and cleanups.
+ * - Alex Davis <letmein@erols.com> Fix problem where partition info
+ * not being read in sd_open. Fix problem where removable media
+ * could be ejected after sd_open.
+ * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
+ * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
+ * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
+ * Support 32k/1M disks.
+ *
+ * Logging policy (needs CONFIG_SCSI_LOGGING defined):
+ * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
+ * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
+ * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
+ * - entering other commands: SCSI_LOG_HLQUEUE level 3
+ * Note: when the logging level is set by the user, it must be greater
+ * than the level indicated above to trigger output.
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/bio.h>
+#include <linux/genhd.h>
+#include <linux/hdreg.h>
+#include <linux/errno.h>
+#include <linux/idr.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/blkpg.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/string_helpers.h>
+#include <linux/async.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <asm/uaccess.h>
+#include <asm/unaligned.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/scsicam.h>
+
+#include "sd.h"
+#include "scsi_priv.h"
+#include "scsi_logging.h"
+
+MODULE_AUTHOR("Eric Youngdale");
+MODULE_DESCRIPTION("SCSI disk (sd) driver");
+MODULE_LICENSE("GPL");
+
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
+
+#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
+#define SD_MINORS 16
+#else
+#define SD_MINORS 0
+#endif
+
+static void sd_config_discard(struct scsi_disk *, unsigned int);
+static void sd_config_write_same(struct scsi_disk *);
+static int sd_revalidate_disk(struct gendisk *);
+static void sd_unlock_native_capacity(struct gendisk *disk);
+static int sd_probe(struct device *);
+static int sd_remove(struct device *);
+static void sd_shutdown(struct device *);
+static int sd_suspend_system(struct device *);
+static int sd_suspend_runtime(struct device *);
+static int sd_resume(struct device *);
+static void sd_rescan(struct device *);
+static int sd_init_command(struct scsi_cmnd *SCpnt);
+static void sd_uninit_command(struct scsi_cmnd *SCpnt);
+static int sd_done(struct scsi_cmnd *);
+static int sd_eh_action(struct scsi_cmnd *, int);
+static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
+static void scsi_disk_release(struct device *cdev);
+static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
+static void sd_print_result(const struct scsi_disk *, const char *, int);
+
+static DEFINE_SPINLOCK(sd_index_lock);
+static DEFINE_IDA(sd_index_ida);
+
+/* This semaphore is used to mediate the 0->1 reference get in the
+ * face of object destruction (i.e. we can't allow a get on an
+ * object after last put) */
+static DEFINE_MUTEX(sd_ref_mutex);
+
+static struct kmem_cache *sd_cdb_cache;
+static mempool_t *sd_cdb_pool;
+
+static const char *sd_cache_types[] = {
+ "write through", "none", "write back",
+ "write back, no read (daft)"
+};
+
+static void sd_set_flush_flag(struct scsi_disk *sdkp)
+{
+ unsigned flush = 0;
+
+ if (sdkp->WCE) {
+ flush |= REQ_FLUSH;
+ if (sdkp->DPOFUA)
+ flush |= REQ_FUA;
+ }
+
+ blk_queue_flush(sdkp->disk->queue, flush);
+}
+
+static ssize_t
+cache_type_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int i, ct = -1, rcd, wce, sp;
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ struct scsi_device *sdp = sdkp->device;
+ char buffer[64];
+ char *buffer_data;
+ struct scsi_mode_data data;
+ struct scsi_sense_hdr sshdr;
+ static const char temp[] = "temporary ";
+ int len;
+
+ if (sdp->type != TYPE_DISK)
+ /* no cache control on RBC devices; theoretically they
+ * can do it, but there's probably so many exceptions
+ * it's not worth the risk */
+ return -EINVAL;
+
+ if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
+ buf += sizeof(temp) - 1;
+ sdkp->cache_override = 1;
+ } else {
+ sdkp->cache_override = 0;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
+ len = strlen(sd_cache_types[i]);
+ if (strncmp(sd_cache_types[i], buf, len) == 0 &&
+ buf[len] == '\n') {
+ ct = i;
+ break;
+ }
+ }
+ if (ct < 0)
+ return -EINVAL;
+ rcd = ct & 0x01 ? 1 : 0;
+ wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
+
+ if (sdkp->cache_override) {
+ sdkp->WCE = wce;
+ sdkp->RCD = rcd;
+ sd_set_flush_flag(sdkp);
+ return count;
+ }
+
+ if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
+ SD_MAX_RETRIES, &data, NULL))
+ return -EINVAL;
+ len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
+ data.block_descriptor_length);
+ buffer_data = buffer + data.header_length +
+ data.block_descriptor_length;
+ buffer_data[2] &= ~0x05;
+ buffer_data[2] |= wce << 2 | rcd;
+ sp = buffer_data[0] & 0x80 ? 1 : 0;
+
+ if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
+ SD_MAX_RETRIES, &data, &sshdr)) {
+ if (scsi_sense_valid(&sshdr))
+ sd_print_sense_hdr(sdkp, &sshdr);
+ return -EINVAL;
+ }
+ revalidate_disk(sdkp->disk);
+ return count;
+}
+
+static ssize_t
+manage_start_stop_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ struct scsi_device *sdp = sdkp->device;
+
+ return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
+}
+
+static ssize_t
+manage_start_stop_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ struct scsi_device *sdp = sdkp->device;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
+
+ return count;
+}
+static DEVICE_ATTR_RW(manage_start_stop);
+
+static ssize_t
+allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+ return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
+}
+
+static ssize_t
+allow_restart_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ struct scsi_device *sdp = sdkp->device;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (sdp->type != TYPE_DISK)
+ return -EINVAL;
+
+ sdp->allow_restart = simple_strtoul(buf, NULL, 10);
+
+ return count;
+}
+static DEVICE_ATTR_RW(allow_restart);
+
+static ssize_t
+cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ int ct = sdkp->RCD + 2*sdkp->WCE;
+
+ return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
+}
+static DEVICE_ATTR_RW(cache_type);
+
+static ssize_t
+FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+ return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
+}
+static DEVICE_ATTR_RO(FUA);
+
+static ssize_t
+protection_type_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+ return snprintf(buf, 20, "%u\n", sdkp->protection_type);
+}
+
+static ssize_t
+protection_type_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ unsigned int val;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ err = kstrtouint(buf, 10, &val);
+
+ if (err)
+ return err;
+
+ if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
+ sdkp->protection_type = val;
+
+ return count;
+}
+static DEVICE_ATTR_RW(protection_type);
+
+static ssize_t
+protection_mode_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ struct scsi_device *sdp = sdkp->device;
+ unsigned int dif, dix;
+
+ dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
+ dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
+
+ if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
+ dif = 0;
+ dix = 1;
+ }
+
+ if (!dif && !dix)
+ return snprintf(buf, 20, "none\n");
+
+ return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
+}
+static DEVICE_ATTR_RO(protection_mode);
+
+static ssize_t
+app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+ return snprintf(buf, 20, "%u\n", sdkp->ATO);
+}
+static DEVICE_ATTR_RO(app_tag_own);
+
+static ssize_t
+thin_provisioning_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+ return snprintf(buf, 20, "%u\n", sdkp->lbpme);
+}
+static DEVICE_ATTR_RO(thin_provisioning);
+
+static const char *lbp_mode[] = {
+ [SD_LBP_FULL] = "full",
+ [SD_LBP_UNMAP] = "unmap",
+ [SD_LBP_WS16] = "writesame_16",
+ [SD_LBP_WS10] = "writesame_10",
+ [SD_LBP_ZERO] = "writesame_zero",
+ [SD_LBP_DISABLE] = "disabled",
+};
+
+static ssize_t
+provisioning_mode_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+ return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
+}
+
+static ssize_t
+provisioning_mode_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ struct scsi_device *sdp = sdkp->device;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (sdp->type != TYPE_DISK)
+ return -EINVAL;
+
+ if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
+ sd_config_discard(sdkp, SD_LBP_UNMAP);
+ else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
+ sd_config_discard(sdkp, SD_LBP_WS16);
+ else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
+ sd_config_discard(sdkp, SD_LBP_WS10);
+ else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
+ sd_config_discard(sdkp, SD_LBP_ZERO);
+ else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
+ sd_config_discard(sdkp, SD_LBP_DISABLE);
+ else
+ return -EINVAL;
+
+ return count;
+}
+static DEVICE_ATTR_RW(provisioning_mode);
+
+static ssize_t
+max_medium_access_timeouts_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+ return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
+}
+
+static ssize_t
+max_medium_access_timeouts_store(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
+
+ return err ? err : count;
+}
+static DEVICE_ATTR_RW(max_medium_access_timeouts);
+
+static ssize_t
+max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+ return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
+}
+
+static ssize_t
+max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ struct scsi_device *sdp = sdkp->device;
+ unsigned long max;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (sdp->type != TYPE_DISK)
+ return -EINVAL;
+
+ err = kstrtoul(buf, 10, &max);
+
+ if (err)
+ return err;
+
+ if (max == 0)
+ sdp->no_write_same = 1;
+ else if (max <= SD_MAX_WS16_BLOCKS) {
+ sdp->no_write_same = 0;
+ sdkp->max_ws_blocks = max;
+ }
+
+ sd_config_write_same(sdkp);
+
+ return count;
+}
+static DEVICE_ATTR_RW(max_write_same_blocks);
+
+static struct attribute *sd_disk_attrs[] = {
+ &dev_attr_cache_type.attr,
+ &dev_attr_FUA.attr,
+ &dev_attr_allow_restart.attr,
+ &dev_attr_manage_start_stop.attr,
+ &dev_attr_protection_type.attr,
+ &dev_attr_protection_mode.attr,
+ &dev_attr_app_tag_own.attr,
+ &dev_attr_thin_provisioning.attr,
+ &dev_attr_provisioning_mode.attr,
+ &dev_attr_max_write_same_blocks.attr,
+ &dev_attr_max_medium_access_timeouts.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(sd_disk);
+
+static struct class sd_disk_class = {
+ .name = "scsi_disk",
+ .owner = THIS_MODULE,
+ .dev_release = scsi_disk_release,
+ .dev_groups = sd_disk_groups,
+};
+
+static const struct dev_pm_ops sd_pm_ops = {
+ .suspend = sd_suspend_system,
+ .resume = sd_resume,
+ .poweroff = sd_suspend_system,
+ .restore = sd_resume,
+ .runtime_suspend = sd_suspend_runtime,
+ .runtime_resume = sd_resume,
+};
+
+static struct scsi_driver sd_template = {
+ .gendrv = {
+ .name = "sd",
+ .owner = THIS_MODULE,
+ .probe = sd_probe,
+ .remove = sd_remove,
+ .shutdown = sd_shutdown,
+ .pm = &sd_pm_ops,
+ },
+ .rescan = sd_rescan,
+ .init_command = sd_init_command,
+ .uninit_command = sd_uninit_command,
+ .done = sd_done,
+ .eh_action = sd_eh_action,
+};
+
+/*
+ * Dummy kobj_map->probe function.
+ * The default ->probe function will call modprobe, which is
+ * pointless as this module is already loaded.
+ */
+static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
+{
+ return NULL;
+}
+
+/*
+ * Device no to disk mapping:
+ *
+ * major disc2 disc p1
+ * |............|.............|....|....| <- dev_t
+ * 31 20 19 8 7 4 3 0
+ *
+ * Inside a major, we have 16k disks, however mapped non-
+ * contiguously. The first 16 disks are for major0, the next
+ * ones with major1, ... Disk 256 is for major0 again, disk 272
+ * for major1, ...
+ * As we stay compatible with our numbering scheme, we can reuse
+ * the well-know SCSI majors 8, 65--71, 136--143.
+ */
+static int sd_major(int major_idx)
+{
+ switch (major_idx) {
+ case 0:
+ return SCSI_DISK0_MAJOR;
+ case 1 ... 7:
+ return SCSI_DISK1_MAJOR + major_idx - 1;
+ case 8 ... 15:
+ return SCSI_DISK8_MAJOR + major_idx - 8;
+ default:
+ BUG();
+ return 0; /* shut up gcc */
+ }
+}
+
+static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
+{
+ struct scsi_disk *sdkp = NULL;
+
+ mutex_lock(&sd_ref_mutex);
+
+ if (disk->private_data) {
+ sdkp = scsi_disk(disk);
+ if (scsi_device_get(sdkp->device) == 0)
+ get_device(&sdkp->dev);
+ else
+ sdkp = NULL;
+ }
+ mutex_unlock(&sd_ref_mutex);
+ return sdkp;
+}
+
+static void scsi_disk_put(struct scsi_disk *sdkp)
+{
+ struct scsi_device *sdev = sdkp->device;
+
+ mutex_lock(&sd_ref_mutex);
+ put_device(&sdkp->dev);
+ scsi_device_put(sdev);
+ mutex_unlock(&sd_ref_mutex);
+}
+
+static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
+ unsigned int dix, unsigned int dif)
+{
+ struct bio *bio = scmd->request->bio;
+ unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
+ unsigned int protect = 0;
+
+ if (dix) { /* DIX Type 0, 1, 2, 3 */
+ if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
+ scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
+
+ if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
+ scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
+ }
+
+ if (dif != SD_DIF_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
+ scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
+
+ if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
+ scmd->prot_flags |= SCSI_PROT_REF_CHECK;
+ }
+
+ if (dif) { /* DIX/DIF Type 1, 2, 3 */
+ scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
+
+ if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
+ protect = 3 << 5; /* Disable target PI checking */
+ else
+ protect = 1 << 5; /* Enable target PI checking */
+ }
+
+ scsi_set_prot_op(scmd, prot_op);
+ scsi_set_prot_type(scmd, dif);
+ scmd->prot_flags &= sd_prot_flag_mask(prot_op);
+
+ return protect;
+}
+
+static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
+{
+ struct request_queue *q = sdkp->disk->queue;
+ unsigned int logical_block_size = sdkp->device->sector_size;
+ unsigned int max_blocks = 0;
+
+ q->limits.discard_zeroes_data = 0;
+ q->limits.discard_alignment = sdkp->unmap_alignment *
+ logical_block_size;
+ q->limits.discard_granularity =
+ max(sdkp->physical_block_size,
+ sdkp->unmap_granularity * logical_block_size);
+
+ sdkp->provisioning_mode = mode;
+
+ switch (mode) {
+
+ case SD_LBP_DISABLE:
+ q->limits.max_discard_sectors = 0;
+ queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
+ return;
+
+ case SD_LBP_UNMAP:
+ max_blocks = min_not_zero(sdkp->max_unmap_blocks,
+ (u32)SD_MAX_WS16_BLOCKS);
+ break;
+
+ case SD_LBP_WS16:
+ max_blocks = min_not_zero(sdkp->max_ws_blocks,
+ (u32)SD_MAX_WS16_BLOCKS);
+ q->limits.discard_zeroes_data = sdkp->lbprz;
+ break;
+
+ case SD_LBP_WS10:
+ max_blocks = min_not_zero(sdkp->max_ws_blocks,
+ (u32)SD_MAX_WS10_BLOCKS);
+ q->limits.discard_zeroes_data = sdkp->lbprz;
+ break;
+
+ case SD_LBP_ZERO:
+ max_blocks = min_not_zero(sdkp->max_ws_blocks,
+ (u32)SD_MAX_WS10_BLOCKS);
+ q->limits.discard_zeroes_data = 1;
+ break;
+ }
+
+ q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
+ queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
+}
+
+/**
+ * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
+ * @sdp: scsi device to operate one
+ * @rq: Request to prepare
+ *
+ * Will issue either UNMAP or WRITE SAME(16) depending on preference
+ * indicated by target device.
+ **/
+static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
+{
+ struct request *rq = cmd->request;
+ struct scsi_device *sdp = cmd->device;
+ struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+ sector_t sector = blk_rq_pos(rq);
+ unsigned int nr_sectors = blk_rq_sectors(rq);
+ unsigned int nr_bytes = blk_rq_bytes(rq);
+ unsigned int len;
+ int ret;
+ char *buf;
+ struct page *page;
+
+ sector >>= ilog2(sdp->sector_size) - 9;
+ nr_sectors >>= ilog2(sdp->sector_size) - 9;
+
+ page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
+ if (!page)
+ return BLKPREP_DEFER;
+
+ switch (sdkp->provisioning_mode) {
+ case SD_LBP_UNMAP:
+ buf = page_address(page);
+
+ cmd->cmd_len = 10;
+ cmd->cmnd[0] = UNMAP;
+ cmd->cmnd[8] = 24;
+
+ put_unaligned_be16(6 + 16, &buf[0]);
+ put_unaligned_be16(16, &buf[2]);
+ put_unaligned_be64(sector, &buf[8]);
+ put_unaligned_be32(nr_sectors, &buf[16]);
+
+ len = 24;
+ break;
+
+ case SD_LBP_WS16:
+ cmd->cmd_len = 16;
+ cmd->cmnd[0] = WRITE_SAME_16;
+ cmd->cmnd[1] = 0x8; /* UNMAP */
+ put_unaligned_be64(sector, &cmd->cmnd[2]);
+ put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
+
+ len = sdkp->device->sector_size;
+ break;
+
+ case SD_LBP_WS10:
+ case SD_LBP_ZERO:
+ cmd->cmd_len = 10;
+ cmd->cmnd[0] = WRITE_SAME;
+ if (sdkp->provisioning_mode == SD_LBP_WS10)
+ cmd->cmnd[1] = 0x8; /* UNMAP */
+ put_unaligned_be32(sector, &cmd->cmnd[2]);
+ put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
+
+ len = sdkp->device->sector_size;
+ break;
+
+ default:
+ ret = BLKPREP_KILL;
+ goto out;
+ }
+
+ rq->completion_data = page;
+ rq->timeout = SD_TIMEOUT;
+
+ cmd->transfersize = len;
+ cmd->allowed = SD_MAX_RETRIES;
+
+ /*
+ * Initially __data_len is set to the amount of data that needs to be
+ * transferred to the target. This amount depends on whether WRITE SAME
+ * or UNMAP is being used. After the scatterlist has been mapped by
+ * scsi_init_io() we set __data_len to the size of the area to be
+ * discarded on disk. This allows us to report completion on the full
+ * amount of blocks described by the request.
+ */
+ blk_add_request_payload(rq, page, len);
+ ret = scsi_init_io(cmd);
+ rq->__data_len = nr_bytes;
+
+out:
+ if (ret != BLKPREP_OK)
+ __free_page(page);
+ return ret;
+}
+
+static void sd_config_write_same(struct scsi_disk *sdkp)
+{
+ struct request_queue *q = sdkp->disk->queue;
+ unsigned int logical_block_size = sdkp->device->sector_size;
+
+ if (sdkp->device->no_write_same) {
+ sdkp->max_ws_blocks = 0;
+ goto out;
+ }
+
+ /* Some devices can not handle block counts above 0xffff despite
+ * supporting WRITE SAME(16). Consequently we default to 64k
+ * blocks per I/O unless the device explicitly advertises a
+ * bigger limit.
+ */
+ if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
+ sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
+ (u32)SD_MAX_WS16_BLOCKS);
+ else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
+ sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
+ (u32)SD_MAX_WS10_BLOCKS);
+ else {
+ sdkp->device->no_write_same = 1;
+ sdkp->max_ws_blocks = 0;
+ }
+
+out:
+ blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
+ (logical_block_size >> 9));
+}
+
+/**
+ * sd_setup_write_same_cmnd - write the same data to multiple blocks
+ * @cmd: command to prepare
+ *
+ * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
+ * preference indicated by target device.
+ **/
+static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
+{
+ struct request *rq = cmd->request;
+ struct scsi_device *sdp = cmd->device;
+ struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
+ struct bio *bio = rq->bio;
+ sector_t sector = blk_rq_pos(rq);
+ unsigned int nr_sectors = blk_rq_sectors(rq);
+ unsigned int nr_bytes = blk_rq_bytes(rq);
+ int ret;
+
+ if (sdkp->device->no_write_same)
+ return BLKPREP_KILL;
+
+ BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
+
+ sector >>= ilog2(sdp->sector_size) - 9;
+ nr_sectors >>= ilog2(sdp->sector_size) - 9;
+
+ rq->timeout = SD_WRITE_SAME_TIMEOUT;
+
+ if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
+ cmd->cmd_len = 16;
+ cmd->cmnd[0] = WRITE_SAME_16;
+ put_unaligned_be64(sector, &cmd->cmnd[2]);
+ put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
+ } else {
+ cmd->cmd_len = 10;
+ cmd->cmnd[0] = WRITE_SAME;
+ put_unaligned_be32(sector, &cmd->cmnd[2]);
+ put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
+ }
+
+ cmd->transfersize = sdp->sector_size;
+ cmd->allowed = SD_MAX_RETRIES;
+
+ /*
+ * For WRITE_SAME the data transferred in the DATA IN buffer is
+ * different from the amount of data actually written to the target.
+ *
+ * We set up __data_len to the amount of data transferred from the
+ * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
+ * to transfer a single sector of data first, but then reset it to
+ * the amount of data to be written right after so that the I/O path
+ * knows how much to actually write.
+ */
+ rq->__data_len = sdp->sector_size;
+ ret = scsi_init_io(cmd);
+ rq->__data_len = nr_bytes;
+ return ret;
+}
+
+static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
+{
+ struct request *rq = cmd->request;
+
+ /* flush requests don't perform I/O, zero the S/G table */
+ memset(&cmd->sdb, 0, sizeof(cmd->sdb));
+
+ cmd->cmnd[0] = SYNCHRONIZE_CACHE;
+ cmd->cmd_len = 10;
+ cmd->transfersize = 0;
+ cmd->allowed = SD_MAX_RETRIES;
+
+ rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
+ return BLKPREP_OK;
+}
+
+static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
+{
+ struct request *rq = SCpnt->request;
+ struct scsi_device *sdp = SCpnt->device;
+ struct gendisk *disk = rq->rq_disk;
+ struct scsi_disk *sdkp;
+ sector_t block = blk_rq_pos(rq);
+ sector_t threshold;
+ unsigned int this_count = blk_rq_sectors(rq);
+ unsigned int dif, dix;
+ int ret;
+ unsigned char protect;
+
+ ret = scsi_init_io(SCpnt);
+ if (ret != BLKPREP_OK)
+ goto out;
+ SCpnt = rq->special;
+ sdkp = scsi_disk(disk);
+
+ /* from here on until we're complete, any goto out
+ * is used for a killable error condition */
+ ret = BLKPREP_KILL;
+
+ SCSI_LOG_HLQUEUE(1,
+ scmd_printk(KERN_INFO, SCpnt,
+ "%s: block=%llu, count=%d\n",
+ __func__, (unsigned long long)block, this_count));
+
+ if (!sdp || !scsi_device_online(sdp) ||
+ block + blk_rq_sectors(rq) > get_capacity(disk)) {
+ SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
+ "Finishing %u sectors\n",
+ blk_rq_sectors(rq)));
+ SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
+ "Retry with 0x%p\n", SCpnt));
+ goto out;
+ }
+
+ if (sdp->changed) {
+ /*
+ * quietly refuse to do anything to a changed disc until
+ * the changed bit has been reset
+ */
+ /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
+ goto out;
+ }
+
+ /*
+ * Some SD card readers can't handle multi-sector accesses which touch
+ * the last one or two hardware sectors. Split accesses as needed.
+ */
+ threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
+ (sdp->sector_size / 512);
+
+ if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
+ if (block < threshold) {
+ /* Access up to the threshold but not beyond */
+ this_count = threshold - block;
+ } else {
+ /* Access only a single hardware sector */
+ this_count = sdp->sector_size / 512;
+ }
+ }
+
+ SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
+ (unsigned long long)block));
+
+ /*
+ * If we have a 1K hardware sectorsize, prevent access to single
+ * 512 byte sectors. In theory we could handle this - in fact
+ * the scsi cdrom driver must be able to handle this because
+ * we typically use 1K blocksizes, and cdroms typically have
+ * 2K hardware sectorsizes. Of course, things are simpler
+ * with the cdrom, since it is read-only. For performance
+ * reasons, the filesystems should be able to handle this
+ * and not force the scsi disk driver to use bounce buffers
+ * for this.
+ */
+ if (sdp->sector_size == 1024) {
+ if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
+ scmd_printk(KERN_ERR, SCpnt,
+ "Bad block number requested\n");
+ goto out;
+ } else {
+ block = block >> 1;
+ this_count = this_count >> 1;
+ }
+ }
+ if (sdp->sector_size == 2048) {
+ if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
+ scmd_printk(KERN_ERR, SCpnt,
+ "Bad block number requested\n");
+ goto out;
+ } else {
+ block = block >> 2;
+ this_count = this_count >> 2;
+ }
+ }
+ if (sdp->sector_size == 4096) {
+ if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
+ scmd_printk(KERN_ERR, SCpnt,
+ "Bad block number requested\n");
+ goto out;
+ } else {
+ block = block >> 3;
+ this_count = this_count >> 3;
+ }
+ }
+ if (rq_data_dir(rq) == WRITE) {
+ SCpnt->cmnd[0] = WRITE_6;
+
+ if (blk_integrity_rq(rq))
+ sd_dif_prepare(SCpnt);
+
+ } else if (rq_data_dir(rq) == READ) {
+ SCpnt->cmnd[0] = READ_6;
+ } else {
+ scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
+ goto out;
+ }
+
+ SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
+ "%s %d/%u 512 byte blocks.\n",
+ (rq_data_dir(rq) == WRITE) ?
+ "writing" : "reading", this_count,
+ blk_rq_sectors(rq)));
+
+ dix = scsi_prot_sg_count(SCpnt);
+ dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
+
+ if (dif || dix)
+ protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
+ else
+ protect = 0;
+
+ if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) {
+ SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
+
+ if (unlikely(SCpnt->cmnd == NULL)) {
+ ret = BLKPREP_DEFER;
+ goto out;
+ }
+
+ SCpnt->cmd_len = SD_EXT_CDB_SIZE;
+ memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
+ SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
+ SCpnt->cmnd[7] = 0x18;
+ SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
+ SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
+
+ /* LBA */
+ SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
+ SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
+ SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
+ SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
+ SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
+ SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
+ SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
+ SCpnt->cmnd[19] = (unsigned char) block & 0xff;
+
+ /* Expected Indirect LBA */
+ SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
+ SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
+ SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
+ SCpnt->cmnd[23] = (unsigned char) block & 0xff;
+
+ /* Transfer length */
+ SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
+ SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
+ SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
+ SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
+ } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
+ SCpnt->cmnd[0] += READ_16 - READ_6;
+ SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
+ SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
+ SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
+ SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
+ SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
+ SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
+ SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
+ SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
+ SCpnt->cmnd[9] = (unsigned char) block & 0xff;
+ SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
+ SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
+ SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
+ SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
+ SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
+ } else if ((this_count > 0xff) || (block > 0x1fffff) ||
+ scsi_device_protection(SCpnt->device) ||
+ SCpnt->device->use_10_for_rw) {
+ SCpnt->cmnd[0] += READ_10 - READ_6;
+ SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
+ SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
+ SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
+ SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
+ SCpnt->cmnd[5] = (unsigned char) block & 0xff;
+ SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
+ SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
+ SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
+ } else {
+ if (unlikely(rq->cmd_flags & REQ_FUA)) {
+ /*
+ * This happens only if this drive failed
+ * 10byte rw command with ILLEGAL_REQUEST
+ * during operation and thus turned off
+ * use_10_for_rw.
+ */
+ scmd_printk(KERN_ERR, SCpnt,
+ "FUA write on READ/WRITE(6) drive\n");
+ goto out;
+ }
+
+ SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
+ SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
+ SCpnt->cmnd[3] = (unsigned char) block & 0xff;
+ SCpnt->cmnd[4] = (unsigned char) this_count;
+ SCpnt->cmnd[5] = 0;
+ }
+ SCpnt->sdb.length = this_count * sdp->sector_size;
+
+ /*
+ * We shouldn't disconnect in the middle of a sector, so with a dumb
+ * host adapter, it's safe to assume that we can at least transfer
+ * this many bytes between each connect / disconnect.
+ */
+ SCpnt->transfersize = sdp->sector_size;
+ SCpnt->underflow = this_count << 9;
+ SCpnt->allowed = SD_MAX_RETRIES;
+
+ /*
+ * This indicates that the command is ready from our end to be
+ * queued.
+ */
+ ret = BLKPREP_OK;
+ out:
+ return ret;
+}
+
+static int sd_init_command(struct scsi_cmnd *cmd)
+{
+ struct request *rq = cmd->request;
+
+ if (rq->cmd_flags & REQ_DISCARD)
+ return sd_setup_discard_cmnd(cmd);
+ else if (rq->cmd_flags & REQ_WRITE_SAME)
+ return sd_setup_write_same_cmnd(cmd);
+ else if (rq->cmd_flags & REQ_FLUSH)
+ return sd_setup_flush_cmnd(cmd);
+ else
+ return sd_setup_read_write_cmnd(cmd);
+}
+
+static void sd_uninit_command(struct scsi_cmnd *SCpnt)
+{
+ struct request *rq = SCpnt->request;
+
+ if (rq->cmd_flags & REQ_DISCARD)
+ __free_page(rq->completion_data);
+
+ if (SCpnt->cmnd != rq->cmd) {
+ mempool_free(SCpnt->cmnd, sd_cdb_pool);
+ SCpnt->cmnd = NULL;
+ SCpnt->cmd_len = 0;
+ }
+}
+
+/**
+ * sd_open - open a scsi disk device
+ * @inode: only i_rdev member may be used
+ * @filp: only f_mode and f_flags may be used
+ *
+ * Returns 0 if successful. Returns a negated errno value in case
+ * of error.
+ *
+ * Note: This can be called from a user context (e.g. fsck(1) )
+ * or from within the kernel (e.g. as a result of a mount(1) ).
+ * In the latter case @inode and @filp carry an abridged amount
+ * of information as noted above.
+ *
+ * Locking: called with bdev->bd_mutex held.
+ **/
+static int sd_open(struct block_device *bdev, fmode_t mode)
+{
+ struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
+ struct scsi_device *sdev;
+ int retval;
+
+ if (!sdkp)
+ return -ENXIO;
+
+ SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
+
+ sdev = sdkp->device;
+
+ /*
+ * If the device is in error recovery, wait until it is done.
+ * If the device is offline, then disallow any access to it.
+ */
+ retval = -ENXIO;
+ if (!scsi_block_when_processing_errors(sdev))
+ goto error_out;
+
+ if (sdev->removable || sdkp->write_prot)
+ check_disk_change(bdev);
+
+ /*
+ * If the drive is empty, just let the open fail.
+ */
+ retval = -ENOMEDIUM;
+ if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
+ goto error_out;
+
+ /*
+ * If the device has the write protect tab set, have the open fail
+ * if the user expects to be able to write to the thing.
+ */
+ retval = -EROFS;
+ if (sdkp->write_prot && (mode & FMODE_WRITE))
+ goto error_out;
+
+ /*
+ * It is possible that the disk changing stuff resulted in
+ * the device being taken offline. If this is the case,
+ * report this to the user, and don't pretend that the
+ * open actually succeeded.
+ */
+ retval = -ENXIO;
+ if (!scsi_device_online(sdev))
+ goto error_out;
+
+ if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
+ if (scsi_block_when_processing_errors(sdev))
+ scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
+ }
+
+ return 0;
+
+error_out:
+ scsi_disk_put(sdkp);
+ return retval;
+}
+
+/**
+ * sd_release - invoked when the (last) close(2) is called on this
+ * scsi disk.
+ * @inode: only i_rdev member may be used
+ * @filp: only f_mode and f_flags may be used
+ *
+ * Returns 0.
+ *
+ * Note: may block (uninterruptible) if error recovery is underway
+ * on this disk.
+ *
+ * Locking: called with bdev->bd_mutex held.
+ **/
+static void sd_release(struct gendisk *disk, fmode_t mode)
+{
+ struct scsi_disk *sdkp = scsi_disk(disk);
+ struct scsi_device *sdev = sdkp->device;
+
+ SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
+
+ if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
+ if (scsi_block_when_processing_errors(sdev))
+ scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
+ }
+
+ /*
+ * XXX and what if there are packets in flight and this close()
+ * XXX is followed by a "rmmod sd_mod"?
+ */
+
+ scsi_disk_put(sdkp);
+}
+
+static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+ struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
+ struct scsi_device *sdp = sdkp->device;
+ struct Scsi_Host *host = sdp->host;
+ int diskinfo[4];
+
+ /* default to most commonly used values */
+ diskinfo[0] = 0x40; /* 1 << 6 */
+ diskinfo[1] = 0x20; /* 1 << 5 */
+ diskinfo[2] = sdkp->capacity >> 11;
+
+ /* override with calculated, extended default, or driver values */
+ if (host->hostt->bios_param)
+ host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
+ else
+ scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
+
+ geo->heads = diskinfo[0];
+ geo->sectors = diskinfo[1];
+ geo->cylinders = diskinfo[2];
+ return 0;
+}
+
+/**
+ * sd_ioctl - process an ioctl
+ * @inode: only i_rdev/i_bdev members may be used
+ * @filp: only f_mode and f_flags may be used
+ * @cmd: ioctl command number
+ * @arg: this is third argument given to ioctl(2) system call.
+ * Often contains a pointer.
+ *
+ * Returns 0 if successful (some ioctls return positive numbers on
+ * success as well). Returns a negated errno value in case of error.
+ *
+ * Note: most ioctls are forward onto the block subsystem or further
+ * down in the scsi subsystem.
+ **/
+static int sd_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ struct gendisk *disk = bdev->bd_disk;
+ struct scsi_disk *sdkp = scsi_disk(disk);
+ struct scsi_device *sdp = sdkp->device;
+ void __user *p = (void __user *)arg;
+ int error;
+
+ SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
+ "cmd=0x%x\n", disk->disk_name, cmd));
+
+ error = scsi_verify_blk_ioctl(bdev, cmd);
+ if (error < 0)
+ return error;
+
+ /*
+ * If we are in the middle of error recovery, don't let anyone
+ * else try and use this device. Also, if error recovery fails, it
+ * may try and take the device offline, in which case all further
+ * access to the device is prohibited.
+ */
+ error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
+ (mode & FMODE_NDELAY) != 0);
+ if (error)
+ goto out;
+
+ /*
+ * Send SCSI addressing ioctls directly to mid level, send other
+ * ioctls to block level and then onto mid level if they can't be
+ * resolved.
+ */
+ switch (cmd) {
+ case SCSI_IOCTL_GET_IDLUN:
+ case SCSI_IOCTL_GET_BUS_NUMBER:
+ error = scsi_ioctl(sdp, cmd, p);
+ break;
+ default:
+ error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
+ if (error != -ENOTTY)
+ break;
+ error = scsi_ioctl(sdp, cmd, p);
+ break;
+ }
+out:
+ return error;
+}
+
+static void set_media_not_present(struct scsi_disk *sdkp)
+{
+ if (sdkp->media_present)
+ sdkp->device->changed = 1;
+
+ if (sdkp->device->removable) {
+ sdkp->media_present = 0;
+ sdkp->capacity = 0;
+ }
+}
+
+static int media_not_present(struct scsi_disk *sdkp,
+ struct scsi_sense_hdr *sshdr)
+{
+ if (!scsi_sense_valid(sshdr))
+ return 0;
+
+ /* not invoked for commands that could return deferred errors */
+ switch (sshdr->sense_key) {
+ case UNIT_ATTENTION:
+ case NOT_READY:
+ /* medium not present */
+ if (sshdr->asc == 0x3A) {
+ set_media_not_present(sdkp);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/**
+ * sd_check_events - check media events
+ * @disk: kernel device descriptor
+ * @clearing: disk events currently being cleared
+ *
+ * Returns mask of DISK_EVENT_*.
+ *
+ * Note: this function is invoked from the block subsystem.
+ **/
+static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
+{
+ struct scsi_disk *sdkp = scsi_disk(disk);
+ struct scsi_device *sdp = sdkp->device;
+ struct scsi_sense_hdr *sshdr = NULL;
+ int retval;
+
+ SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
+
+ /*
+ * If the device is offline, don't send any commands - just pretend as
+ * if the command failed. If the device ever comes back online, we
+ * can deal with it then. It is only because of unrecoverable errors
+ * that we would ever take a device offline in the first place.
+ */
+ if (!scsi_device_online(sdp)) {
+ set_media_not_present(sdkp);
+ goto out;
+ }
+
+ /*
+ * Using TEST_UNIT_READY enables differentiation between drive with
+ * no cartridge loaded - NOT READY, drive with changed cartridge -
+ * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
+ *
+ * Drives that auto spin down. eg iomega jaz 1G, will be started
+ * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
+ * sd_revalidate() is called.
+ */
+ retval = -ENODEV;
+
+ if (scsi_block_when_processing_errors(sdp)) {
+ sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
+ retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
+ sshdr);
+ }
+
+ /* failed to execute TUR, assume media not present */
+ if (host_byte(retval)) {
+ set_media_not_present(sdkp);
+ goto out;
+ }
+
+ if (media_not_present(sdkp, sshdr))
+ goto out;
+
+ /*
+ * For removable scsi disk we have to recognise the presence
+ * of a disk in the drive.
+ */
+ if (!sdkp->media_present)
+ sdp->changed = 1;
+ sdkp->media_present = 1;
+out:
+ /*
+ * sdp->changed is set under the following conditions:
+ *
+ * Medium present state has changed in either direction.
+ * Device has indicated UNIT_ATTENTION.
+ */
+ kfree(sshdr);
+ retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
+ sdp->changed = 0;
+ return retval;
+}
+
+static int sd_sync_cache(struct scsi_disk *sdkp)
+{
+ int retries, res;
+ struct scsi_device *sdp = sdkp->device;
+ const int timeout = sdp->request_queue->rq_timeout
+ * SD_FLUSH_TIMEOUT_MULTIPLIER;
+ struct scsi_sense_hdr sshdr;
+
+ if (!scsi_device_online(sdp))
+ return -ENODEV;
+
+ for (retries = 3; retries > 0; --retries) {
+ unsigned char cmd[10] = { 0 };
+
+ cmd[0] = SYNCHRONIZE_CACHE;
+ /*
+ * Leave the rest of the command zero to indicate
+ * flush everything.
+ */
+ res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
+ &sshdr, timeout, SD_MAX_RETRIES,
+ NULL, REQ_PM);
+ if (res == 0)
+ break;
+ }
+
+ if (res) {
+ sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
+
+ if (driver_byte(res) & DRIVER_SENSE)
+ sd_print_sense_hdr(sdkp, &sshdr);
+ /* we need to evaluate the error return */
+ if (scsi_sense_valid(&sshdr) &&
+ (sshdr.asc == 0x3a || /* medium not present */
+ sshdr.asc == 0x20)) /* invalid command */
+ /* this is no error here */
+ return 0;
+
+ switch (host_byte(res)) {
+ /* ignore errors due to racing a disconnection */
+ case DID_BAD_TARGET:
+ case DID_NO_CONNECT:
+ return 0;
+ /* signal the upper layer it might try again */
+ case DID_BUS_BUSY:
+ case DID_IMM_RETRY:
+ case DID_REQUEUE:
+ case DID_SOFT_ERROR:
+ return -EBUSY;
+ default:
+ return -EIO;
+ }
+ }
+ return 0;
+}
+
+static void sd_rescan(struct device *dev)
+{
+ struct scsi_disk *sdkp = dev_get_drvdata(dev);
+
+ revalidate_disk(sdkp->disk);
+}
+
+
+#ifdef CONFIG_COMPAT
+/*
+ * This gets directly called from VFS. When the ioctl
+ * is not recognized we go back to the other translation paths.
+ */
+static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
+ int error;
+
+ error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
+ (mode & FMODE_NDELAY) != 0);
+ if (error)
+ return error;
+
+ /*
+ * Let the static ioctl translation table take care of it.
+ */
+ if (!sdev->host->hostt->compat_ioctl)
+ return -ENOIOCTLCMD;
+ return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
+}
+#endif
+
+static const struct block_device_operations sd_fops = {
+ .owner = THIS_MODULE,
+ .open = sd_open,
+ .release = sd_release,
+ .ioctl = sd_ioctl,
+ .getgeo = sd_getgeo,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = sd_compat_ioctl,
+#endif
+ .check_events = sd_check_events,
+ .revalidate_disk = sd_revalidate_disk,
+ .unlock_native_capacity = sd_unlock_native_capacity,
+};
+
+/**
+ * sd_eh_action - error handling callback
+ * @scmd: sd-issued command that has failed
+ * @eh_disp: The recovery disposition suggested by the midlayer
+ *
+ * This function is called by the SCSI midlayer upon completion of an
+ * error test command (currently TEST UNIT READY). The result of sending
+ * the eh command is passed in eh_disp. We're looking for devices that
+ * fail medium access commands but are OK with non access commands like
+ * test unit ready (so wrongly see the device as having a successful
+ * recovery)
+ **/
+static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
+{
+ struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
+
+ if (!scsi_device_online(scmd->device) ||
+ !scsi_medium_access_command(scmd) ||
+ host_byte(scmd->result) != DID_TIME_OUT ||
+ eh_disp != SUCCESS)
+ return eh_disp;
+
+ /*
+ * The device has timed out executing a medium access command.
+ * However, the TEST UNIT READY command sent during error
+ * handling completed successfully. Either the device is in the
+ * process of recovering or has it suffered an internal failure
+ * that prevents access to the storage medium.
+ */
+ sdkp->medium_access_timed_out++;
+
+ /*
+ * If the device keeps failing read/write commands but TEST UNIT
+ * READY always completes successfully we assume that medium
+ * access is no longer possible and take the device offline.
+ */
+ if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
+ scmd_printk(KERN_ERR, scmd,
+ "Medium access timeout failure. Offlining disk!\n");
+ scsi_device_set_state(scmd->device, SDEV_OFFLINE);
+
+ return FAILED;
+ }
+
+ return eh_disp;
+}
+
+static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
+{
+ u64 start_lba = blk_rq_pos(scmd->request);
+ u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
+ u64 factor = scmd->device->sector_size / 512;
+ u64 bad_lba;
+ int info_valid;
+ /*
+ * resid is optional but mostly filled in. When it's unused,
+ * its value is zero, so we assume the whole buffer transferred
+ */
+ unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
+ unsigned int good_bytes;
+
+ if (scmd->request->cmd_type != REQ_TYPE_FS)
+ return 0;
+
+ info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
+ SCSI_SENSE_BUFFERSIZE,
+ &bad_lba);
+ if (!info_valid)
+ return 0;
+
+ if (scsi_bufflen(scmd) <= scmd->device->sector_size)
+ return 0;
+
+ /* be careful ... don't want any overflows */
+ do_div(start_lba, factor);
+ do_div(end_lba, factor);
+
+ /* The bad lba was reported incorrectly, we have no idea where
+ * the error is.
+ */
+ if (bad_lba < start_lba || bad_lba >= end_lba)
+ return 0;
+
+ /* This computation should always be done in terms of
+ * the resolution of the device's medium.
+ */
+ good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
+ return min(good_bytes, transferred);
+}
+
+/**
+ * sd_done - bottom half handler: called when the lower level
+ * driver has completed (successfully or otherwise) a scsi command.
+ * @SCpnt: mid-level's per command structure.
+ *
+ * Note: potentially run from within an ISR. Must not block.
+ **/
+static int sd_done(struct scsi_cmnd *SCpnt)
+{
+ int result = SCpnt->result;
+ unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
+ struct scsi_sense_hdr sshdr;
+ struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
+ struct request *req = SCpnt->request;
+ int sense_valid = 0;
+ int sense_deferred = 0;
+ unsigned char op = SCpnt->cmnd[0];
+ unsigned char unmap = SCpnt->cmnd[1] & 8;
+
+ if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
+ if (!result) {
+ good_bytes = blk_rq_bytes(req);
+ scsi_set_resid(SCpnt, 0);
+ } else {
+ good_bytes = 0;
+ scsi_set_resid(SCpnt, blk_rq_bytes(req));
+ }
+ }
+
+ if (result) {
+ sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
+ if (sense_valid)
+ sense_deferred = scsi_sense_is_deferred(&sshdr);
+ }
+ sdkp->medium_access_timed_out = 0;
+
+ if (driver_byte(result) != DRIVER_SENSE &&
+ (!sense_valid || sense_deferred))
+ goto out;
+
+ switch (sshdr.sense_key) {
+ case HARDWARE_ERROR:
+ case MEDIUM_ERROR:
+ good_bytes = sd_completed_bytes(SCpnt);
+ break;
+ case RECOVERED_ERROR:
+ good_bytes = scsi_bufflen(SCpnt);
+ break;
+ case NO_SENSE:
+ /* This indicates a false check condition, so ignore it. An
+ * unknown amount of data was transferred so treat it as an
+ * error.
+ */
+ SCpnt->result = 0;
+ memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
+ break;
+ case ABORTED_COMMAND:
+ if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
+ good_bytes = sd_completed_bytes(SCpnt);
+ break;
+ case ILLEGAL_REQUEST:
+ if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
+ good_bytes = sd_completed_bytes(SCpnt);
+ /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
+ if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
+ switch (op) {
+ case UNMAP:
+ sd_config_discard(sdkp, SD_LBP_DISABLE);
+ break;
+ case WRITE_SAME_16:
+ case WRITE_SAME:
+ if (unmap)
+ sd_config_discard(sdkp, SD_LBP_DISABLE);
+ else {
+ sdkp->device->no_write_same = 1;
+ sd_config_write_same(sdkp);
+
+ good_bytes = 0;
+ req->__data_len = blk_rq_bytes(req);
+ req->cmd_flags |= REQ_QUIET;
+ }
+ }
+ }
+ break;
+ default:
+ break;
+ }
+ out:
+ SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
+ "sd_done: completed %d of %d bytes\n",
+ good_bytes, scsi_bufflen(SCpnt)));
+
+ if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
+ sd_dif_complete(SCpnt, good_bytes);
+
+ return good_bytes;
+}
+
+/*
+ * spinup disk - called only in sd_revalidate_disk()
+ */
+static void
+sd_spinup_disk(struct scsi_disk *sdkp)
+{
+ unsigned char cmd[10];
+ unsigned long spintime_expire = 0;
+ int retries, spintime;
+ unsigned int the_result;
+ struct scsi_sense_hdr sshdr;
+ int sense_valid = 0;
+
+ spintime = 0;
+
+ /* Spin up drives, as required. Only do this at boot time */
+ /* Spinup needs to be done for module loads too. */
+ do {
+ retries = 0;
+
+ do {
+ cmd[0] = TEST_UNIT_READY;
+ memset((void *) &cmd[1], 0, 9);
+
+ the_result = scsi_execute_req(sdkp->device, cmd,
+ DMA_NONE, NULL, 0,
+ &sshdr, SD_TIMEOUT,
+ SD_MAX_RETRIES, NULL);
+
+ /*
+ * If the drive has indicated to us that it
+ * doesn't have any media in it, don't bother
+ * with any more polling.
+ */
+ if (media_not_present(sdkp, &sshdr))
+ return;
+
+ if (the_result)
+ sense_valid = scsi_sense_valid(&sshdr);
+ retries++;
+ } while (retries < 3 &&
+ (!scsi_status_is_good(the_result) ||
+ ((driver_byte(the_result) & DRIVER_SENSE) &&
+ sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
+
+ if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
+ /* no sense, TUR either succeeded or failed
+ * with a status error */
+ if(!spintime && !scsi_status_is_good(the_result)) {
+ sd_print_result(sdkp, "Test Unit Ready failed",
+ the_result);
+ }
+ break;
+ }
+
+ /*
+ * The device does not want the automatic start to be issued.
+ */
+ if (sdkp->device->no_start_on_add)
+ break;
+
+ if (sense_valid && sshdr.sense_key == NOT_READY) {
+ if (sshdr.asc == 4 && sshdr.ascq == 3)
+ break; /* manual intervention required */
+ if (sshdr.asc == 4 && sshdr.ascq == 0xb)
+ break; /* standby */
+ if (sshdr.asc == 4 && sshdr.ascq == 0xc)
+ break; /* unavailable */
+ /*
+ * Issue command to spin up drive when not ready
+ */
+ if (!spintime) {
+ sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
+ cmd[0] = START_STOP;
+ cmd[1] = 1; /* Return immediately */
+ memset((void *) &cmd[2], 0, 8);
+ cmd[4] = 1; /* Start spin cycle */
+ if (sdkp->device->start_stop_pwr_cond)
+ cmd[4] |= 1 << 4;
+ scsi_execute_req(sdkp->device, cmd, DMA_NONE,
+ NULL, 0, &sshdr,
+ SD_TIMEOUT, SD_MAX_RETRIES,
+ NULL);
+ spintime_expire = jiffies + 100 * HZ;
+ spintime = 1;
+ }
+ /* Wait 1 second for next try */
+ msleep(1000);
+ printk(".");
+
+ /*
+ * Wait for USB flash devices with slow firmware.
+ * Yes, this sense key/ASC combination shouldn't
+ * occur here. It's characteristic of these devices.
+ */
+ } else if (sense_valid &&
+ sshdr.sense_key == UNIT_ATTENTION &&
+ sshdr.asc == 0x28) {
+ if (!spintime) {
+ spintime_expire = jiffies + 5 * HZ;
+ spintime = 1;
+ }
+ /* Wait 1 second for next try */
+ msleep(1000);
+ } else {
+ /* we don't understand the sense code, so it's
+ * probably pointless to loop */
+ if(!spintime) {
+ sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
+ sd_print_sense_hdr(sdkp, &sshdr);
+ }
+ break;
+ }
+
+ } while (spintime && time_before_eq(jiffies, spintime_expire));
+
+ if (spintime) {
+ if (scsi_status_is_good(the_result))
+ printk("ready\n");
+ else
+ printk("not responding...\n");
+ }
+}
+
+
+/*
+ * Determine whether disk supports Data Integrity Field.
+ */
+static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+ struct scsi_device *sdp = sdkp->device;
+ u8 type;
+ int ret = 0;
+
+ if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
+ return ret;
+
+ type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
+
+ if (type > SD_DIF_TYPE3_PROTECTION)
+ ret = -ENODEV;
+ else if (scsi_host_dif_capable(sdp->host, type))
+ ret = 1;
+
+ if (sdkp->first_scan || type != sdkp->protection_type)
+ switch (ret) {
+ case -ENODEV:
+ sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
+ " protection type %u. Disabling disk!\n",
+ type);
+ break;
+ case 1:
+ sd_printk(KERN_NOTICE, sdkp,
+ "Enabling DIF Type %u protection\n", type);
+ break;
+ case 0:
+ sd_printk(KERN_NOTICE, sdkp,
+ "Disabling DIF Type %u protection\n", type);
+ break;
+ }
+
+ sdkp->protection_type = type;
+
+ return ret;
+}
+
+static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
+ struct scsi_sense_hdr *sshdr, int sense_valid,
+ int the_result)
+{
+ if (driver_byte(the_result) & DRIVER_SENSE)
+ sd_print_sense_hdr(sdkp, sshdr);
+ else
+ sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
+
+ /*
+ * Set dirty bit for removable devices if not ready -
+ * sometimes drives will not report this properly.
+ */
+ if (sdp->removable &&
+ sense_valid && sshdr->sense_key == NOT_READY)
+ set_media_not_present(sdkp);
+
+ /*
+ * We used to set media_present to 0 here to indicate no media
+ * in the drive, but some drives fail read capacity even with
+ * media present, so we can't do that.
+ */
+ sdkp->capacity = 0; /* unknown mapped to zero - as usual */
+}
+
+#define RC16_LEN 32
+#if RC16_LEN > SD_BUF_SIZE
+#error RC16_LEN must not be more than SD_BUF_SIZE
+#endif
+
+#define READ_CAPACITY_RETRIES_ON_RESET 10
+
+static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
+ unsigned char *buffer)
+{
+ unsigned char cmd[16];
+ struct scsi_sense_hdr sshdr;
+ int sense_valid = 0;
+ int the_result;
+ int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
+ unsigned int alignment;
+ unsigned long long lba;
+ unsigned sector_size;
+
+ if (sdp->no_read_capacity_16)
+ return -EINVAL;
+
+ do {
+ memset(cmd, 0, 16);
+ cmd[0] = SERVICE_ACTION_IN_16;
+ cmd[1] = SAI_READ_CAPACITY_16;
+ cmd[13] = RC16_LEN;
+ memset(buffer, 0, RC16_LEN);
+
+ the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
+ buffer, RC16_LEN, &sshdr,
+ SD_TIMEOUT, SD_MAX_RETRIES, NULL);
+
+ if (media_not_present(sdkp, &sshdr))
+ return -ENODEV;
+
+ if (the_result) {
+ sense_valid = scsi_sense_valid(&sshdr);
+ if (sense_valid &&
+ sshdr.sense_key == ILLEGAL_REQUEST &&
+ (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
+ sshdr.ascq == 0x00)
+ /* Invalid Command Operation Code or
+ * Invalid Field in CDB, just retry
+ * silently with RC10 */
+ return -EINVAL;
+ if (sense_valid &&
+ sshdr.sense_key == UNIT_ATTENTION &&
+ sshdr.asc == 0x29 && sshdr.ascq == 0x00)
+ /* Device reset might occur several times,
+ * give it one more chance */
+ if (--reset_retries > 0)
+ continue;
+ }
+ retries--;
+
+ } while (the_result && retries);
+
+ if (the_result) {
+ sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
+ read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
+ return -EINVAL;
+ }
+
+ sector_size = get_unaligned_be32(&buffer[8]);
+ lba = get_unaligned_be64(&buffer[0]);
+
+ if (sd_read_protection_type(sdkp, buffer) < 0) {
+ sdkp->capacity = 0;
+ return -ENODEV;
+ }
+
+ if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
+ sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
+ "kernel compiled with support for large block "
+ "devices.\n");
+ sdkp->capacity = 0;
+ return -EOVERFLOW;
+ }
+
+ /* Logical blocks per physical block exponent */
+ sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
+
+ /* Lowest aligned logical block */
+ alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
+ blk_queue_alignment_offset(sdp->request_queue, alignment);
+ if (alignment && sdkp->first_scan)
+ sd_printk(KERN_NOTICE, sdkp,
+ "physical block alignment offset: %u\n", alignment);
+
+ if (buffer[14] & 0x80) { /* LBPME */
+ sdkp->lbpme = 1;
+
+ if (buffer[14] & 0x40) /* LBPRZ */
+ sdkp->lbprz = 1;
+
+ sd_config_discard(sdkp, SD_LBP_WS16);
+ }
+
+ sdkp->capacity = lba + 1;
+ return sector_size;
+}
+
+static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
+ unsigned char *buffer)
+{
+ unsigned char cmd[16];
+ struct scsi_sense_hdr sshdr;
+ int sense_valid = 0;
+ int the_result;
+ int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
+ sector_t lba;
+ unsigned sector_size;
+
+ do {
+ cmd[0] = READ_CAPACITY;
+ memset(&cmd[1], 0, 9);
+ memset(buffer, 0, 8);
+
+ the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
+ buffer, 8, &sshdr,
+ SD_TIMEOUT, SD_MAX_RETRIES, NULL);
+
+ if (media_not_present(sdkp, &sshdr))
+ return -ENODEV;
+
+ if (the_result) {
+ sense_valid = scsi_sense_valid(&sshdr);
+ if (sense_valid &&
+ sshdr.sense_key == UNIT_ATTENTION &&
+ sshdr.asc == 0x29 && sshdr.ascq == 0x00)
+ /* Device reset might occur several times,
+ * give it one more chance */
+ if (--reset_retries > 0)
+ continue;
+ }
+ retries--;
+
+ } while (the_result && retries);
+
+ if (the_result) {
+ sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
+ read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
+ return -EINVAL;
+ }
+
+ sector_size = get_unaligned_be32(&buffer[4]);
+ lba = get_unaligned_be32(&buffer[0]);
+
+ if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
+ /* Some buggy (usb cardreader) devices return an lba of
+ 0xffffffff when the want to report a size of 0 (with
+ which they really mean no media is present) */
+ sdkp->capacity = 0;
+ sdkp->physical_block_size = sector_size;
+ return sector_size;
+ }
+
+ if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
+ sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
+ "kernel compiled with support for large block "
+ "devices.\n");
+ sdkp->capacity = 0;
+ return -EOVERFLOW;
+ }
+
+ sdkp->capacity = lba + 1;
+ sdkp->physical_block_size = sector_size;
+ return sector_size;
+}
+
+static int sd_try_rc16_first(struct scsi_device *sdp)
+{
+ if (sdp->host->max_cmd_len < 16)
+ return 0;
+ if (sdp->try_rc_10_first)
+ return 0;
+ if (sdp->scsi_level > SCSI_SPC_2)
+ return 1;
+ if (scsi_device_protection(sdp))
+ return 1;
+ return 0;
+}
+
+/*
+ * read disk capacity
+ */
+static void
+sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+ int sector_size;
+ struct scsi_device *sdp = sdkp->device;
+ sector_t old_capacity = sdkp->capacity;
+
+ if (sd_try_rc16_first(sdp)) {
+ sector_size = read_capacity_16(sdkp, sdp, buffer);
+ if (sector_size == -EOVERFLOW)
+ goto got_data;
+ if (sector_size == -ENODEV)
+ return;
+ if (sector_size < 0)
+ sector_size = read_capacity_10(sdkp, sdp, buffer);
+ if (sector_size < 0)
+ return;
+ } else {
+ sector_size = read_capacity_10(sdkp, sdp, buffer);
+ if (sector_size == -EOVERFLOW)
+ goto got_data;
+ if (sector_size < 0)
+ return;
+ if ((sizeof(sdkp->capacity) > 4) &&
+ (sdkp->capacity > 0xffffffffULL)) {
+ int old_sector_size = sector_size;
+ sd_printk(KERN_NOTICE, sdkp, "Very big device. "
+ "Trying to use READ CAPACITY(16).\n");
+ sector_size = read_capacity_16(sdkp, sdp, buffer);
+ if (sector_size < 0) {
+ sd_printk(KERN_NOTICE, sdkp,
+ "Using 0xffffffff as device size\n");
+ sdkp->capacity = 1 + (sector_t) 0xffffffff;
+ sector_size = old_sector_size;
+ goto got_data;
+ }
+ }
+ }
+
+ /* Some devices are known to return the total number of blocks,
+ * not the highest block number. Some devices have versions
+ * which do this and others which do not. Some devices we might
+ * suspect of doing this but we don't know for certain.
+ *
+ * If we know the reported capacity is wrong, decrement it. If
+ * we can only guess, then assume the number of blocks is even
+ * (usually true but not always) and err on the side of lowering
+ * the capacity.
+ */
+ if (sdp->fix_capacity ||
+ (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
+ sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
+ "from its reported value: %llu\n",
+ (unsigned long long) sdkp->capacity);
+ --sdkp->capacity;
+ }
+
+got_data:
+ if (sector_size == 0) {
+ sector_size = 512;
+ sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
+ "assuming 512.\n");
+ }
+
+ if (sector_size != 512 &&
+ sector_size != 1024 &&
+ sector_size != 2048 &&
+ sector_size != 4096) {
+ sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
+ sector_size);
+ /*
+ * The user might want to re-format the drive with
+ * a supported sectorsize. Once this happens, it
+ * would be relatively trivial to set the thing up.
+ * For this reason, we leave the thing in the table.
+ */
+ sdkp->capacity = 0;
+ /*
+ * set a bogus sector size so the normal read/write
+ * logic in the block layer will eventually refuse any
+ * request on this device without tripping over power
+ * of two sector size assumptions
+ */
+ sector_size = 512;
+ }
+ blk_queue_logical_block_size(sdp->request_queue, sector_size);
+
+ {
+ char cap_str_2[10], cap_str_10[10];
+
+ string_get_size(sdkp->capacity, sector_size,
+ STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
+ string_get_size(sdkp->capacity, sector_size,
+ STRING_UNITS_10, cap_str_10,
+ sizeof(cap_str_10));
+
+ if (sdkp->first_scan || old_capacity != sdkp->capacity) {
+ sd_printk(KERN_NOTICE, sdkp,
+ "%llu %d-byte logical blocks: (%s/%s)\n",
+ (unsigned long long)sdkp->capacity,
+ sector_size, cap_str_10, cap_str_2);
+
+ if (sdkp->physical_block_size != sector_size)
+ sd_printk(KERN_NOTICE, sdkp,
+ "%u-byte physical blocks\n",
+ sdkp->physical_block_size);
+ }
+ }
+
+ if (sdkp->capacity > 0xffffffff) {
+ sdp->use_16_for_rw = 1;
+ sdkp->max_xfer_blocks = SD_MAX_XFER_BLOCKS;
+ } else
+ sdkp->max_xfer_blocks = SD_DEF_XFER_BLOCKS;
+
+ /* Rescale capacity to 512-byte units */
+ if (sector_size == 4096)
+ sdkp->capacity <<= 3;
+ else if (sector_size == 2048)
+ sdkp->capacity <<= 2;
+ else if (sector_size == 1024)
+ sdkp->capacity <<= 1;
+
+ blk_queue_physical_block_size(sdp->request_queue,
+ sdkp->physical_block_size);
+ sdkp->device->sector_size = sector_size;
+}
+
+/* called with buffer of length 512 */
+static inline int
+sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
+ unsigned char *buffer, int len, struct scsi_mode_data *data,
+ struct scsi_sense_hdr *sshdr)
+{
+ return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
+ SD_TIMEOUT, SD_MAX_RETRIES, data,
+ sshdr);
+}
+
+/*
+ * read write protect setting, if possible - called only in sd_revalidate_disk()
+ * called with buffer of length SD_BUF_SIZE
+ */
+static void
+sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+ int res;
+ struct scsi_device *sdp = sdkp->device;
+ struct scsi_mode_data data;
+ int old_wp = sdkp->write_prot;
+
+ set_disk_ro(sdkp->disk, 0);
+ if (sdp->skip_ms_page_3f) {
+ sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
+ return;
+ }
+
+ if (sdp->use_192_bytes_for_3f) {
+ res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
+ } else {
+ /*
+ * First attempt: ask for all pages (0x3F), but only 4 bytes.
+ * We have to start carefully: some devices hang if we ask
+ * for more than is available.
+ */
+ res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
+
+ /*
+ * Second attempt: ask for page 0 When only page 0 is
+ * implemented, a request for page 3F may return Sense Key
+ * 5: Illegal Request, Sense Code 24: Invalid field in
+ * CDB.
+ */
+ if (!scsi_status_is_good(res))
+ res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
+
+ /*
+ * Third attempt: ask 255 bytes, as we did earlier.
+ */
+ if (!scsi_status_is_good(res))
+ res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
+ &data, NULL);
+ }
+
+ if (!scsi_status_is_good(res)) {
+ sd_first_printk(KERN_WARNING, sdkp,
+ "Test WP failed, assume Write Enabled\n");
+ } else {
+ sdkp->write_prot = ((data.device_specific & 0x80) != 0);
+ set_disk_ro(sdkp->disk, sdkp->write_prot);
+ if (sdkp->first_scan || old_wp != sdkp->write_prot) {
+ sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
+ sdkp->write_prot ? "on" : "off");
+ sd_printk(KERN_DEBUG, sdkp,
+ "Mode Sense: %02x %02x %02x %02x\n",
+ buffer[0], buffer[1], buffer[2], buffer[3]);
+ }
+ }
+}
+
+/*
+ * sd_read_cache_type - called only from sd_revalidate_disk()
+ * called with buffer of length SD_BUF_SIZE
+ */
+static void
+sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+ int len = 0, res;
+ struct scsi_device *sdp = sdkp->device;
+
+ int dbd;
+ int modepage;
+ int first_len;
+ struct scsi_mode_data data;
+ struct scsi_sense_hdr sshdr;
+ int old_wce = sdkp->WCE;
+ int old_rcd = sdkp->RCD;
+ int old_dpofua = sdkp->DPOFUA;
+
+
+ if (sdkp->cache_override)
+ return;
+
+ first_len = 4;
+ if (sdp->skip_ms_page_8) {
+ if (sdp->type == TYPE_RBC)
+ goto defaults;
+ else {
+ if (sdp->skip_ms_page_3f)
+ goto defaults;
+ modepage = 0x3F;
+ if (sdp->use_192_bytes_for_3f)
+ first_len = 192;
+ dbd = 0;
+ }
+ } else if (sdp->type == TYPE_RBC) {
+ modepage = 6;
+ dbd = 8;
+ } else {
+ modepage = 8;
+ dbd = 0;
+ }
+
+ /* cautiously ask */
+ res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
+ &data, &sshdr);
+
+ if (!scsi_status_is_good(res))
+ goto bad_sense;
+
+ if (!data.header_length) {
+ modepage = 6;
+ first_len = 0;
+ sd_first_printk(KERN_ERR, sdkp,
+ "Missing header in MODE_SENSE response\n");
+ }
+
+ /* that went OK, now ask for the proper length */
+ len = data.length;
+
+ /*
+ * We're only interested in the first three bytes, actually.
+ * But the data cache page is defined for the first 20.
+ */
+ if (len < 3)
+ goto bad_sense;
+ else if (len > SD_BUF_SIZE) {
+ sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
+ "data from %d to %d bytes\n", len, SD_BUF_SIZE);
+ len = SD_BUF_SIZE;
+ }
+ if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
+ len = 192;
+
+ /* Get the data */
+ if (len > first_len)
+ res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
+ &data, &sshdr);
+
+ if (scsi_status_is_good(res)) {
+ int offset = data.header_length + data.block_descriptor_length;
+
+ while (offset < len) {
+ u8 page_code = buffer[offset] & 0x3F;
+ u8 spf = buffer[offset] & 0x40;
+
+ if (page_code == 8 || page_code == 6) {
+ /* We're interested only in the first 3 bytes.
+ */
+ if (len - offset <= 2) {
+ sd_first_printk(KERN_ERR, sdkp,
+ "Incomplete mode parameter "
+ "data\n");
+ goto defaults;
+ } else {
+ modepage = page_code;
+ goto Page_found;
+ }
+ } else {
+ /* Go to the next page */
+ if (spf && len - offset > 3)
+ offset += 4 + (buffer[offset+2] << 8) +
+ buffer[offset+3];
+ else if (!spf && len - offset > 1)
+ offset += 2 + buffer[offset+1];
+ else {
+ sd_first_printk(KERN_ERR, sdkp,
+ "Incomplete mode "
+ "parameter data\n");
+ goto defaults;
+ }
+ }
+ }
+
+ sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
+ goto defaults;
+
+ Page_found:
+ if (modepage == 8) {
+ sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
+ sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
+ } else {
+ sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
+ sdkp->RCD = 0;
+ }
+
+ sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
+ if (sdp->broken_fua) {
+ sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
+ sdkp->DPOFUA = 0;
+ } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
+ sd_first_printk(KERN_NOTICE, sdkp,
+ "Uses READ/WRITE(6), disabling FUA\n");
+ sdkp->DPOFUA = 0;
+ }
+
+ /* No cache flush allowed for write protected devices */
+ if (sdkp->WCE && sdkp->write_prot)
+ sdkp->WCE = 0;
+
+ if (sdkp->first_scan || old_wce != sdkp->WCE ||
+ old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
+ sd_printk(KERN_NOTICE, sdkp,
+ "Write cache: %s, read cache: %s, %s\n",
+ sdkp->WCE ? "enabled" : "disabled",
+ sdkp->RCD ? "disabled" : "enabled",
+ sdkp->DPOFUA ? "supports DPO and FUA"
+ : "doesn't support DPO or FUA");
+
+ return;
+ }
+
+bad_sense:
+ if (scsi_sense_valid(&sshdr) &&
+ sshdr.sense_key == ILLEGAL_REQUEST &&
+ sshdr.asc == 0x24 && sshdr.ascq == 0x0)
+ /* Invalid field in CDB */
+ sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
+ else
+ sd_first_printk(KERN_ERR, sdkp,
+ "Asking for cache data failed\n");
+
+defaults:
+ if (sdp->wce_default_on) {
+ sd_first_printk(KERN_NOTICE, sdkp,
+ "Assuming drive cache: write back\n");
+ sdkp->WCE = 1;
+ } else {
+ sd_first_printk(KERN_ERR, sdkp,
+ "Assuming drive cache: write through\n");
+ sdkp->WCE = 0;
+ }
+ sdkp->RCD = 0;
+ sdkp->DPOFUA = 0;
+}
+
+/*
+ * The ATO bit indicates whether the DIF application tag is available
+ * for use by the operating system.
+ */
+static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+ int res, offset;
+ struct scsi_device *sdp = sdkp->device;
+ struct scsi_mode_data data;
+ struct scsi_sense_hdr sshdr;
+
+ if (sdp->type != TYPE_DISK)
+ return;
+
+ if (sdkp->protection_type == 0)
+ return;
+
+ res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
+ SD_MAX_RETRIES, &data, &sshdr);
+
+ if (!scsi_status_is_good(res) || !data.header_length ||
+ data.length < 6) {
+ sd_first_printk(KERN_WARNING, sdkp,
+ "getting Control mode page failed, assume no ATO\n");
+
+ if (scsi_sense_valid(&sshdr))
+ sd_print_sense_hdr(sdkp, &sshdr);
+
+ return;
+ }
+
+ offset = data.header_length + data.block_descriptor_length;
+
+ if ((buffer[offset] & 0x3f) != 0x0a) {
+ sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
+ return;
+ }
+
+ if ((buffer[offset + 5] & 0x80) == 0)
+ return;
+
+ sdkp->ATO = 1;
+
+ return;
+}
+
+/**
+ * sd_read_block_limits - Query disk device for preferred I/O sizes.
+ * @disk: disk to query
+ */
+static void sd_read_block_limits(struct scsi_disk *sdkp)
+{
+ unsigned int sector_sz = sdkp->device->sector_size;
+ const int vpd_len = 64;
+ u32 max_xfer_length;
+ unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
+
+ if (!buffer ||
+ /* Block Limits VPD */
+ scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
+ goto out;
+
+ max_xfer_length = get_unaligned_be32(&buffer[8]);
+ if (max_xfer_length)
+ sdkp->max_xfer_blocks = max_xfer_length;
+
+ blk_queue_io_min(sdkp->disk->queue,
+ get_unaligned_be16(&buffer[6]) * sector_sz);
+ blk_queue_io_opt(sdkp->disk->queue,
+ get_unaligned_be32(&buffer[12]) * sector_sz);
+
+ if (buffer[3] == 0x3c) {
+ unsigned int lba_count, desc_count;
+
+ sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
+
+ if (!sdkp->lbpme)
+ goto out;
+
+ lba_count = get_unaligned_be32(&buffer[20]);
+ desc_count = get_unaligned_be32(&buffer[24]);
+
+ if (lba_count && desc_count)
+ sdkp->max_unmap_blocks = lba_count;
+
+ sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
+
+ if (buffer[32] & 0x80)
+ sdkp->unmap_alignment =
+ get_unaligned_be32(&buffer[32]) & ~(1 << 31);
+
+ if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
+
+ if (sdkp->max_unmap_blocks)
+ sd_config_discard(sdkp, SD_LBP_UNMAP);
+ else
+ sd_config_discard(sdkp, SD_LBP_WS16);
+
+ } else { /* LBP VPD page tells us what to use */
+ if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
+ sd_config_discard(sdkp, SD_LBP_UNMAP);
+ else if (sdkp->lbpws)
+ sd_config_discard(sdkp, SD_LBP_WS16);
+ else if (sdkp->lbpws10)
+ sd_config_discard(sdkp, SD_LBP_WS10);
+ else if (sdkp->lbpu && sdkp->max_unmap_blocks)
+ sd_config_discard(sdkp, SD_LBP_UNMAP);
+ else
+ sd_config_discard(sdkp, SD_LBP_DISABLE);
+ }
+ }
+
+ out:
+ kfree(buffer);
+}
+
+/**
+ * sd_read_block_characteristics - Query block dev. characteristics
+ * @disk: disk to query
+ */
+static void sd_read_block_characteristics(struct scsi_disk *sdkp)
+{
+ unsigned char *buffer;
+ u16 rot;
+ const int vpd_len = 64;
+
+ buffer = kmalloc(vpd_len, GFP_KERNEL);
+
+ if (!buffer ||
+ /* Block Device Characteristics VPD */
+ scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
+ goto out;
+
+ rot = get_unaligned_be16(&buffer[4]);
+
+ if (rot == 1) {
+ queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
+ queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue);
+ }
+
+ out:
+ kfree(buffer);
+}
+
+/**
+ * sd_read_block_provisioning - Query provisioning VPD page
+ * @disk: disk to query
+ */
+static void sd_read_block_provisioning(struct scsi_disk *sdkp)
+{
+ unsigned char *buffer;
+ const int vpd_len = 8;
+
+ if (sdkp->lbpme == 0)
+ return;
+
+ buffer = kmalloc(vpd_len, GFP_KERNEL);
+
+ if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
+ goto out;
+
+ sdkp->lbpvpd = 1;
+ sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
+ sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
+ sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
+
+ out:
+ kfree(buffer);
+}
+
+static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+ struct scsi_device *sdev = sdkp->device;
+
+ if (sdev->host->no_write_same) {
+ sdev->no_write_same = 1;
+
+ return;
+ }
+
+ if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
+ /* too large values might cause issues with arcmsr */
+ int vpd_buf_len = 64;
+
+ sdev->no_report_opcodes = 1;
+
+ /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
+ * CODES is unsupported and the device has an ATA
+ * Information VPD page (SAT).
+ */
+ if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
+ sdev->no_write_same = 1;
+ }
+
+ if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
+ sdkp->ws16 = 1;
+
+ if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
+ sdkp->ws10 = 1;
+}
+
+static int sd_try_extended_inquiry(struct scsi_device *sdp)
+{
+ /* Attempt VPD inquiry if the device blacklist explicitly calls
+ * for it.
+ */
+ if (sdp->try_vpd_pages)
+ return 1;
+ /*
+ * Although VPD inquiries can go to SCSI-2 type devices,
+ * some USB ones crash on receiving them, and the pages
+ * we currently ask for are for SPC-3 and beyond
+ */
+ if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
+ return 1;
+ return 0;
+}
+
+/**
+ * sd_revalidate_disk - called the first time a new disk is seen,
+ * performs disk spin up, read_capacity, etc.
+ * @disk: struct gendisk we care about
+ **/
+static int sd_revalidate_disk(struct gendisk *disk)
+{
+ struct scsi_disk *sdkp = scsi_disk(disk);
+ struct scsi_device *sdp = sdkp->device;
+ unsigned char *buffer;
+ unsigned int max_xfer;
+
+ SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
+ "sd_revalidate_disk\n"));
+
+ /*
+ * If the device is offline, don't try and read capacity or any
+ * of the other niceties.
+ */
+ if (!scsi_device_online(sdp))
+ goto out;
+
+ buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
+ if (!buffer) {
+ sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
+ "allocation failure.\n");
+ goto out;
+ }
+
+ sd_spinup_disk(sdkp);
+
+ /*
+ * Without media there is no reason to ask; moreover, some devices
+ * react badly if we do.
+ */
+ if (sdkp->media_present) {
+ sd_read_capacity(sdkp, buffer);
+
+ if (sd_try_extended_inquiry(sdp)) {
+ sd_read_block_provisioning(sdkp);
+ sd_read_block_limits(sdkp);
+ sd_read_block_characteristics(sdkp);
+ }
+
+ sd_read_write_protect_flag(sdkp, buffer);
+ sd_read_cache_type(sdkp, buffer);
+ sd_read_app_tag_own(sdkp, buffer);
+ sd_read_write_same(sdkp, buffer);
+ }
+
+ sdkp->first_scan = 0;
+
+ /*
+ * We now have all cache related info, determine how we deal
+ * with flush requests.
+ */
+ sd_set_flush_flag(sdkp);
+
+ max_xfer = sdkp->max_xfer_blocks;
+ max_xfer <<= ilog2(sdp->sector_size) - 9;
+
+ max_xfer = min_not_zero(queue_max_hw_sectors(sdkp->disk->queue),
+ max_xfer);
+ blk_queue_max_hw_sectors(sdkp->disk->queue, max_xfer);
+ set_capacity(disk, sdkp->capacity);
+ sd_config_write_same(sdkp);
+ kfree(buffer);
+
+ out:
+ return 0;
+}
+
+/**
+ * sd_unlock_native_capacity - unlock native capacity
+ * @disk: struct gendisk to set capacity for
+ *
+ * Block layer calls this function if it detects that partitions
+ * on @disk reach beyond the end of the device. If the SCSI host
+ * implements ->unlock_native_capacity() method, it's invoked to
+ * give it a chance to adjust the device capacity.
+ *
+ * CONTEXT:
+ * Defined by block layer. Might sleep.
+ */
+static void sd_unlock_native_capacity(struct gendisk *disk)
+{
+ struct scsi_device *sdev = scsi_disk(disk)->device;
+
+ if (sdev->host->hostt->unlock_native_capacity)
+ sdev->host->hostt->unlock_native_capacity(sdev);
+}
+
+/**
+ * sd_format_disk_name - format disk name
+ * @prefix: name prefix - ie. "sd" for SCSI disks
+ * @index: index of the disk to format name for
+ * @buf: output buffer
+ * @buflen: length of the output buffer
+ *
+ * SCSI disk names starts at sda. The 26th device is sdz and the
+ * 27th is sdaa. The last one for two lettered suffix is sdzz
+ * which is followed by sdaaa.
+ *
+ * This is basically 26 base counting with one extra 'nil' entry
+ * at the beginning from the second digit on and can be
+ * determined using similar method as 26 base conversion with the
+ * index shifted -1 after each digit is computed.
+ *
+ * CONTEXT:
+ * Don't care.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
+{
+ const int base = 'z' - 'a' + 1;
+ char *begin = buf + strlen(prefix);
+ char *end = buf + buflen;
+ char *p;
+ int unit;
+
+ p = end - 1;
+ *p = '\0';
+ unit = base;
+ do {
+ if (p == begin)
+ return -EINVAL;
+ *--p = 'a' + (index % unit);
+ index = (index / unit) - 1;
+ } while (index >= 0);
+
+ memmove(begin, p, end - p);
+ memcpy(buf, prefix, strlen(prefix));
+
+ return 0;
+}
+
+/*
+ * The asynchronous part of sd_probe
+ */
+static void sd_probe_async(void *data, async_cookie_t cookie)
+{
+ struct scsi_disk *sdkp = data;
+ struct scsi_device *sdp;
+ struct gendisk *gd;
+ u32 index;
+ struct device *dev;
+
+ sdp = sdkp->device;
+ gd = sdkp->disk;
+ index = sdkp->index;
+ dev = &sdp->sdev_gendev;
+
+ gd->major = sd_major((index & 0xf0) >> 4);
+ gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
+ gd->minors = SD_MINORS;
+
+ gd->fops = &sd_fops;
+ gd->private_data = &sdkp->driver;
+ gd->queue = sdkp->device->request_queue;
+
+ /* defaults, until the device tells us otherwise */
+ sdp->sector_size = 512;
+ sdkp->capacity = 0;
+ sdkp->media_present = 1;
+ sdkp->write_prot = 0;
+ sdkp->cache_override = 0;
+ sdkp->WCE = 0;
+ sdkp->RCD = 0;
+ sdkp->ATO = 0;
+ sdkp->first_scan = 1;
+ sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
+
+ sd_revalidate_disk(gd);
+
+ gd->driverfs_dev = &sdp->sdev_gendev;
+ gd->flags = GENHD_FL_EXT_DEVT;
+ if (sdp->removable) {
+ gd->flags |= GENHD_FL_REMOVABLE;
+ gd->events |= DISK_EVENT_MEDIA_CHANGE;
+ }
+
+ blk_pm_runtime_init(sdp->request_queue, dev);
+ add_disk(gd);
+ if (sdkp->capacity)
+ sd_dif_config_host(sdkp);
+
+ sd_revalidate_disk(gd);
+
+ sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
+ sdp->removable ? "removable " : "");
+ scsi_autopm_put_device(sdp);
+ put_device(&sdkp->dev);
+}
+
+/**
+ * sd_probe - called during driver initialization and whenever a
+ * new scsi device is attached to the system. It is called once
+ * for each scsi device (not just disks) present.
+ * @dev: pointer to device object
+ *
+ * Returns 0 if successful (or not interested in this scsi device
+ * (e.g. scanner)); 1 when there is an error.
+ *
+ * Note: this function is invoked from the scsi mid-level.
+ * This function sets up the mapping between a given
+ * <host,channel,id,lun> (found in sdp) and new device name
+ * (e.g. /dev/sda). More precisely it is the block device major
+ * and minor number that is chosen here.
+ *
+ * Assume sd_probe is not re-entrant (for time being)
+ * Also think about sd_probe() and sd_remove() running coincidentally.
+ **/
+static int sd_probe(struct device *dev)
+{
+ struct scsi_device *sdp = to_scsi_device(dev);
+ struct scsi_disk *sdkp;
+ struct gendisk *gd;
+ int index;
+ int error;
+
+ scsi_autopm_get_device(sdp);
+ error = -ENODEV;
+ if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
+ goto out;
+
+ SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
+ "sd_probe\n"));
+
+ error = -ENOMEM;
+ sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
+ if (!sdkp)
+ goto out;
+
+ gd = alloc_disk(SD_MINORS);
+ if (!gd)
+ goto out_free;
+
+ do {
+ if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
+ goto out_put;
+
+ spin_lock(&sd_index_lock);
+ error = ida_get_new(&sd_index_ida, &index);
+ spin_unlock(&sd_index_lock);
+ } while (error == -EAGAIN);
+
+ if (error) {
+ sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
+ goto out_put;
+ }
+
+ error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
+ if (error) {
+ sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
+ goto out_free_index;
+ }
+
+ sdkp->device = sdp;
+ sdkp->driver = &sd_template;
+ sdkp->disk = gd;
+ sdkp->index = index;
+ atomic_set(&sdkp->openers, 0);
+ atomic_set(&sdkp->device->ioerr_cnt, 0);
+
+ if (!sdp->request_queue->rq_timeout) {
+ if (sdp->type != TYPE_MOD)
+ blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
+ else
+ blk_queue_rq_timeout(sdp->request_queue,
+ SD_MOD_TIMEOUT);
+ }
+
+ device_initialize(&sdkp->dev);
+ sdkp->dev.parent = dev;
+ sdkp->dev.class = &sd_disk_class;
+ dev_set_name(&sdkp->dev, "%s", dev_name(dev));
+
+ if (device_add(&sdkp->dev))
+ goto out_free_index;
+
+ get_device(dev);
+ dev_set_drvdata(dev, sdkp);
+
+ get_device(&sdkp->dev); /* prevent release before async_schedule */
+ async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
+
+ return 0;
+
+ out_free_index:
+ spin_lock(&sd_index_lock);
+ ida_remove(&sd_index_ida, index);
+ spin_unlock(&sd_index_lock);
+ out_put:
+ put_disk(gd);
+ out_free:
+ kfree(sdkp);
+ out:
+ scsi_autopm_put_device(sdp);
+ return error;
+}
+
+/**
+ * sd_remove - called whenever a scsi disk (previously recognized by
+ * sd_probe) is detached from the system. It is called (potentially
+ * multiple times) during sd module unload.
+ * @sdp: pointer to mid level scsi device object
+ *
+ * Note: this function is invoked from the scsi mid-level.
+ * This function potentially frees up a device name (e.g. /dev/sdc)
+ * that could be re-used by a subsequent sd_probe().
+ * This function is not called when the built-in sd driver is "exit-ed".
+ **/
+static int sd_remove(struct device *dev)
+{
+ struct scsi_disk *sdkp;
+ dev_t devt;
+
+ sdkp = dev_get_drvdata(dev);
+ devt = disk_devt(sdkp->disk);
+ scsi_autopm_get_device(sdkp->device);
+
+ async_synchronize_full_domain(&scsi_sd_pm_domain);
+ async_synchronize_full_domain(&scsi_sd_probe_domain);
+ device_del(&sdkp->dev);
+ del_gendisk(sdkp->disk);
+ sd_shutdown(dev);
+
+ blk_register_region(devt, SD_MINORS, NULL,
+ sd_default_probe, NULL, NULL);
+
+ mutex_lock(&sd_ref_mutex);
+ dev_set_drvdata(dev, NULL);
+ put_device(&sdkp->dev);
+ mutex_unlock(&sd_ref_mutex);
+
+ return 0;
+}
+
+/**
+ * scsi_disk_release - Called to free the scsi_disk structure
+ * @dev: pointer to embedded class device
+ *
+ * sd_ref_mutex must be held entering this routine. Because it is
+ * called on last put, you should always use the scsi_disk_get()
+ * scsi_disk_put() helpers which manipulate the semaphore directly
+ * and never do a direct put_device.
+ **/
+static void scsi_disk_release(struct device *dev)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ struct gendisk *disk = sdkp->disk;
+
+ spin_lock(&sd_index_lock);
+ ida_remove(&sd_index_ida, sdkp->index);
+ spin_unlock(&sd_index_lock);
+
+ blk_integrity_unregister(disk);
+ disk->private_data = NULL;
+ put_disk(disk);
+ put_device(&sdkp->device->sdev_gendev);
+
+ kfree(sdkp);
+}
+
+static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
+{
+ unsigned char cmd[6] = { START_STOP }; /* START_VALID */
+ struct scsi_sense_hdr sshdr;
+ struct scsi_device *sdp = sdkp->device;
+ int res;
+
+ if (start)
+ cmd[4] |= 1; /* START */
+
+ if (sdp->start_stop_pwr_cond)
+ cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
+
+ if (!scsi_device_online(sdp))
+ return -ENODEV;
+
+ res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
+ SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
+ if (res) {
+ sd_print_result(sdkp, "Start/Stop Unit failed", res);
+ if (driver_byte(res) & DRIVER_SENSE)
+ sd_print_sense_hdr(sdkp, &sshdr);
+ if (scsi_sense_valid(&sshdr) &&
+ /* 0x3a is medium not present */
+ sshdr.asc == 0x3a)
+ res = 0;
+ }
+
+ /* SCSI error codes must not go to the generic layer */
+ if (res)
+ return -EIO;
+
+ return 0;
+}
+
+/*
+ * Send a SYNCHRONIZE CACHE instruction down to the device through
+ * the normal SCSI command structure. Wait for the command to
+ * complete.
+ */
+static void sd_shutdown(struct device *dev)
+{
+ struct scsi_disk *sdkp = dev_get_drvdata(dev);
+
+ if (!sdkp)
+ return; /* this can happen */
+
+ if (pm_runtime_suspended(dev))
+ return;
+
+ if (sdkp->WCE && sdkp->media_present) {
+ sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
+ sd_sync_cache(sdkp);
+ }
+
+ if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
+ sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
+ sd_start_stop_device(sdkp, 0);
+ }
+}
+
+static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
+{
+ struct scsi_disk *sdkp = dev_get_drvdata(dev);
+ int ret = 0;
+
+ if (!sdkp)
+ return 0; /* this can happen */
+
+ if (sdkp->WCE && sdkp->media_present) {
+ sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
+ ret = sd_sync_cache(sdkp);
+ if (ret) {
+ /* ignore OFFLINE device */
+ if (ret == -ENODEV)
+ ret = 0;
+ goto done;
+ }
+ }
+
+ if (sdkp->device->manage_start_stop) {
+ sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
+ /* an error is not worth aborting a system sleep */
+ ret = sd_start_stop_device(sdkp, 0);
+ if (ignore_stop_errors)
+ ret = 0;
+ }
+
+done:
+ return ret;
+}
+
+static int sd_suspend_system(struct device *dev)
+{
+ return sd_suspend_common(dev, true);
+}
+
+static int sd_suspend_runtime(struct device *dev)
+{
+ return sd_suspend_common(dev, false);
+}
+
+static int sd_resume(struct device *dev)
+{
+ struct scsi_disk *sdkp = dev_get_drvdata(dev);
+
+ if (!sdkp->device->manage_start_stop)
+ return 0;
+
+ sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
+ return sd_start_stop_device(sdkp, 1);
+}
+
+/**
+ * init_sd - entry point for this driver (both when built in or when
+ * a module).
+ *
+ * Note: this function registers this driver with the scsi mid-level.
+ **/
+static int __init init_sd(void)
+{
+ int majors = 0, i, err;
+
+ SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
+
+ for (i = 0; i < SD_MAJORS; i++) {
+ if (register_blkdev(sd_major(i), "sd") != 0)
+ continue;
+ majors++;
+ blk_register_region(sd_major(i), SD_MINORS, NULL,
+ sd_default_probe, NULL, NULL);
+ }
+
+ if (!majors)
+ return -ENODEV;
+
+ err = class_register(&sd_disk_class);
+ if (err)
+ goto err_out;
+
+ sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
+ 0, 0, NULL);
+ if (!sd_cdb_cache) {
+ printk(KERN_ERR "sd: can't init extended cdb cache\n");
+ err = -ENOMEM;
+ goto err_out_class;
+ }
+
+ sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
+ if (!sd_cdb_pool) {
+ printk(KERN_ERR "sd: can't init extended cdb pool\n");
+ err = -ENOMEM;
+ goto err_out_cache;
+ }
+
+ err = scsi_register_driver(&sd_template.gendrv);
+ if (err)
+ goto err_out_driver;
+
+ return 0;
+
+err_out_driver:
+ mempool_destroy(sd_cdb_pool);
+
+err_out_cache:
+ kmem_cache_destroy(sd_cdb_cache);
+
+err_out_class:
+ class_unregister(&sd_disk_class);
+err_out:
+ for (i = 0; i < SD_MAJORS; i++)
+ unregister_blkdev(sd_major(i), "sd");
+ return err;
+}
+
+/**
+ * exit_sd - exit point for this driver (when it is a module).
+ *
+ * Note: this function unregisters this driver from the scsi mid-level.
+ **/
+static void __exit exit_sd(void)
+{
+ int i;
+
+ SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
+
+ scsi_unregister_driver(&sd_template.gendrv);
+ mempool_destroy(sd_cdb_pool);
+ kmem_cache_destroy(sd_cdb_cache);
+
+ class_unregister(&sd_disk_class);
+
+ for (i = 0; i < SD_MAJORS; i++) {
+ blk_unregister_region(sd_major(i), SD_MINORS);
+ unregister_blkdev(sd_major(i), "sd");
+ }
+}
+
+module_init(init_sd);
+module_exit(exit_sd);
+
+static void sd_print_sense_hdr(struct scsi_disk *sdkp,
+ struct scsi_sense_hdr *sshdr)
+{
+ scsi_print_sense_hdr(sdkp->device,
+ sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
+}
+
+static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
+ int result)
+{
+ const char *hb_string = scsi_hostbyte_string(result);
+ const char *db_string = scsi_driverbyte_string(result);
+
+ if (hb_string || db_string)
+ sd_printk(KERN_INFO, sdkp,
+ "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
+ hb_string ? hb_string : "invalid",
+ db_string ? db_string : "invalid");
+ else
+ sd_printk(KERN_INFO, sdkp,
+ "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
+ msg, host_byte(result), driver_byte(result));
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-02 17:03:03 +0000