forked from Minki/linux
2b14290078
The last_sector_bug flag was added to work around a bug in certain usb cardreaders, where they would crash if a multiple sector read included the last sector. The original implementation avoids this by e.g. splitting an 8 sector read which includes the last sector into a 7 sector read, and a single sector read for the last sector. The flag is enabled for all USB devices. This revealed a second bug in other usb cardreaders, which crash when they get a multiple sector read which stops 1 sector short of the last sector. Affected hardware includes the Kingston "MobileLite" external USB cardreader and the internal USB cardreader on the Asus EeePC. Extend the last_sector_bug workaround to ensure that any access which touches the last 8 hardware sectors of the device is a single sector long. Requests are shrunk as necessary to meet this constraint. This gives us a safety margin against potential unknown or future bugs affecting multi-sector access to the end of the device. The two known bugs only affect the last 2 sectors. However, they suggest that these devices are prone to fencepost errors and that multi-sector access to the end of the device is not well tested. Popular OS's use multi-sector accesses, but they rarely read the last few sectors. Linux (with udev & vol_id) automatically reads sectors from the end of the device on insertion. It is assumed that single sector accesses are more thoroughly tested during development. Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk> Tested-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2112 lines
56 KiB
C
2112 lines
56 KiB
C
/*
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* sd.c Copyright (C) 1992 Drew Eckhardt
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* Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
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*
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* Linux scsi disk driver
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* Initial versions: Drew Eckhardt
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* Subsequent revisions: Eric Youngdale
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* Modification history:
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* - Drew Eckhardt <drew@colorado.edu> original
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* - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
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* outstanding request, and other enhancements.
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* Support loadable low-level scsi drivers.
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* - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
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* eight major numbers.
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* - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
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* - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
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* sd_init and cleanups.
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* - Alex Davis <letmein@erols.com> Fix problem where partition info
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* not being read in sd_open. Fix problem where removable media
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* could be ejected after sd_open.
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* - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
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* - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
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* <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
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* Support 32k/1M disks.
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*
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* Logging policy (needs CONFIG_SCSI_LOGGING defined):
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* - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
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* - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
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* - entering sd_ioctl: SCSI_LOG_IOCTL level 1
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* - entering other commands: SCSI_LOG_HLQUEUE level 3
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* Note: when the logging level is set by the user, it must be greater
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* than the level indicated above to trigger output.
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/bio.h>
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#include <linux/genhd.h>
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#include <linux/hdreg.h>
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#include <linux/errno.h>
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#include <linux/idr.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/blkpg.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/scsicam.h>
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#include "sd.h"
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#include "scsi_logging.h"
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MODULE_AUTHOR("Eric Youngdale");
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MODULE_DESCRIPTION("SCSI disk (sd) driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
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static int sd_revalidate_disk(struct gendisk *);
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static int sd_probe(struct device *);
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static int sd_remove(struct device *);
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static void sd_shutdown(struct device *);
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static int sd_suspend(struct device *, pm_message_t state);
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static int sd_resume(struct device *);
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static void sd_rescan(struct device *);
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static int sd_done(struct scsi_cmnd *);
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static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
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static void scsi_disk_release(struct device *cdev);
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static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
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static void sd_print_result(struct scsi_disk *, int);
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static DEFINE_IDA(sd_index_ida);
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/* This semaphore is used to mediate the 0->1 reference get in the
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* face of object destruction (i.e. we can't allow a get on an
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* object after last put) */
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static DEFINE_MUTEX(sd_ref_mutex);
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static const char *sd_cache_types[] = {
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"write through", "none", "write back",
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"write back, no read (daft)"
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};
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static ssize_t
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sd_store_cache_type(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int i, ct = -1, rcd, wce, sp;
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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struct scsi_device *sdp = sdkp->device;
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char buffer[64];
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char *buffer_data;
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struct scsi_mode_data data;
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struct scsi_sense_hdr sshdr;
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int len;
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if (sdp->type != TYPE_DISK)
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/* no cache control on RBC devices; theoretically they
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* can do it, but there's probably so many exceptions
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* it's not worth the risk */
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
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const int len = strlen(sd_cache_types[i]);
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if (strncmp(sd_cache_types[i], buf, len) == 0 &&
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buf[len] == '\n') {
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ct = i;
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break;
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}
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}
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if (ct < 0)
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return -EINVAL;
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rcd = ct & 0x01 ? 1 : 0;
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wce = ct & 0x02 ? 1 : 0;
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if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
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SD_MAX_RETRIES, &data, NULL))
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return -EINVAL;
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len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
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data.block_descriptor_length);
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buffer_data = buffer + data.header_length +
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data.block_descriptor_length;
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buffer_data[2] &= ~0x05;
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buffer_data[2] |= wce << 2 | rcd;
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sp = buffer_data[0] & 0x80 ? 1 : 0;
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if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
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SD_MAX_RETRIES, &data, &sshdr)) {
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if (scsi_sense_valid(&sshdr))
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sd_print_sense_hdr(sdkp, &sshdr);
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return -EINVAL;
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}
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sd_revalidate_disk(sdkp->disk);
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return count;
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}
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static ssize_t
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sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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struct scsi_device *sdp = sdkp->device;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static ssize_t
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sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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struct scsi_device *sdp = sdkp->device;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (sdp->type != TYPE_DISK)
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return -EINVAL;
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sdp->allow_restart = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static ssize_t
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sd_show_cache_type(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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int ct = sdkp->RCD + 2*sdkp->WCE;
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return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
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}
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static ssize_t
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sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
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}
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static ssize_t
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sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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struct scsi_device *sdp = sdkp->device;
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return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
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}
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static ssize_t
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sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
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}
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static ssize_t
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sd_show_protection_type(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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return snprintf(buf, 20, "%u\n", sdkp->protection_type);
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}
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static ssize_t
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sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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return snprintf(buf, 20, "%u\n", sdkp->ATO);
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}
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static struct device_attribute sd_disk_attrs[] = {
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__ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
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sd_store_cache_type),
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__ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
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__ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
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sd_store_allow_restart),
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__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
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sd_store_manage_start_stop),
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__ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
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__ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
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__ATTR_NULL,
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};
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static struct class sd_disk_class = {
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.name = "scsi_disk",
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.owner = THIS_MODULE,
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.dev_release = scsi_disk_release,
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.dev_attrs = sd_disk_attrs,
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};
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static struct scsi_driver sd_template = {
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.owner = THIS_MODULE,
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.gendrv = {
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.name = "sd",
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.probe = sd_probe,
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.remove = sd_remove,
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.suspend = sd_suspend,
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.resume = sd_resume,
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.shutdown = sd_shutdown,
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},
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.rescan = sd_rescan,
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.done = sd_done,
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};
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/*
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* Device no to disk mapping:
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*
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* major disc2 disc p1
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* |............|.............|....|....| <- dev_t
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* 31 20 19 8 7 4 3 0
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*
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* Inside a major, we have 16k disks, however mapped non-
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* contiguously. The first 16 disks are for major0, the next
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* ones with major1, ... Disk 256 is for major0 again, disk 272
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* for major1, ...
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* As we stay compatible with our numbering scheme, we can reuse
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* the well-know SCSI majors 8, 65--71, 136--143.
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*/
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static int sd_major(int major_idx)
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{
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switch (major_idx) {
|
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case 0:
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return SCSI_DISK0_MAJOR;
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case 1 ... 7:
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return SCSI_DISK1_MAJOR + major_idx - 1;
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case 8 ... 15:
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return SCSI_DISK8_MAJOR + major_idx - 8;
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default:
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BUG();
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return 0; /* shut up gcc */
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}
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}
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static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
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{
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struct scsi_disk *sdkp = NULL;
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if (disk->private_data) {
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sdkp = scsi_disk(disk);
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if (scsi_device_get(sdkp->device) == 0)
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get_device(&sdkp->dev);
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else
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sdkp = NULL;
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}
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return sdkp;
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}
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static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
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{
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struct scsi_disk *sdkp;
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mutex_lock(&sd_ref_mutex);
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sdkp = __scsi_disk_get(disk);
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mutex_unlock(&sd_ref_mutex);
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return sdkp;
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}
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static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
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{
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struct scsi_disk *sdkp;
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mutex_lock(&sd_ref_mutex);
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sdkp = dev_get_drvdata(dev);
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if (sdkp)
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sdkp = __scsi_disk_get(sdkp->disk);
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mutex_unlock(&sd_ref_mutex);
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return sdkp;
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}
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static void scsi_disk_put(struct scsi_disk *sdkp)
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{
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struct scsi_device *sdev = sdkp->device;
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mutex_lock(&sd_ref_mutex);
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put_device(&sdkp->dev);
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scsi_device_put(sdev);
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mutex_unlock(&sd_ref_mutex);
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}
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/**
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* sd_init_command - build a scsi (read or write) command from
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* information in the request structure.
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* @SCpnt: pointer to mid-level's per scsi command structure that
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* contains request and into which the scsi command is written
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*
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* Returns 1 if successful and 0 if error (or cannot be done now).
|
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**/
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static int sd_prep_fn(struct request_queue *q, struct request *rq)
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{
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struct scsi_cmnd *SCpnt;
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struct scsi_device *sdp = q->queuedata;
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struct gendisk *disk = rq->rq_disk;
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struct scsi_disk *sdkp;
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sector_t block = rq->sector;
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sector_t threshold;
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unsigned int this_count = rq->nr_sectors;
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unsigned int timeout = sdp->timeout;
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int ret;
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|
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if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
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ret = scsi_setup_blk_pc_cmnd(sdp, rq);
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goto out;
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} else if (rq->cmd_type != REQ_TYPE_FS) {
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ret = BLKPREP_KILL;
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goto out;
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|
}
|
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ret = scsi_setup_fs_cmnd(sdp, rq);
|
|
if (ret != BLKPREP_OK)
|
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goto out;
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|
SCpnt = rq->special;
|
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sdkp = scsi_disk(disk);
|
|
|
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/* from here on until we're complete, any goto out
|
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* is used for a killable error condition */
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ret = BLKPREP_KILL;
|
|
|
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SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
|
|
"sd_init_command: block=%llu, "
|
|
"count=%d\n",
|
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(unsigned long long)block,
|
|
this_count));
|
|
|
|
if (!sdp || !scsi_device_online(sdp) ||
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block + rq->nr_sectors > get_capacity(disk)) {
|
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SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
|
|
"Finishing %ld sectors\n",
|
|
rq->nr_sectors));
|
|
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. 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) || (rq->nr_sectors & 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) || (rq->nr_sectors & 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) || (rq->nr_sectors & 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) {
|
|
if (!sdp->writeable) {
|
|
goto out;
|
|
}
|
|
SCpnt->cmnd[0] = WRITE_6;
|
|
SCpnt->sc_data_direction = DMA_TO_DEVICE;
|
|
|
|
if (blk_integrity_rq(rq) &&
|
|
sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
|
|
goto out;
|
|
|
|
} else if (rq_data_dir(rq) == READ) {
|
|
SCpnt->cmnd[0] = READ_6;
|
|
SCpnt->sc_data_direction = DMA_FROM_DEVICE;
|
|
} else {
|
|
scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
|
|
goto out;
|
|
}
|
|
|
|
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
|
|
"%s %d/%ld 512 byte blocks.\n",
|
|
(rq_data_dir(rq) == WRITE) ?
|
|
"writing" : "reading", this_count,
|
|
rq->nr_sectors));
|
|
|
|
/* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
|
|
if (scsi_host_dif_capable(sdp->host, sdkp->protection_type))
|
|
SCpnt->cmnd[1] = 1 << 5;
|
|
else
|
|
SCpnt->cmnd[1] = 0;
|
|
|
|
if (block > 0xffffffff) {
|
|
SCpnt->cmnd[0] += READ_16 - READ_6;
|
|
SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 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) {
|
|
if (this_count > 0xffff)
|
|
this_count = 0xffff;
|
|
|
|
SCpnt->cmnd[0] += READ_10 - READ_6;
|
|
SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 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(blk_fua_rq(rq))) {
|
|
/*
|
|
* 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;
|
|
|
|
/* If DIF or DIX is enabled, tell HBA how to handle request */
|
|
if (sdkp->protection_type || scsi_prot_sg_count(SCpnt))
|
|
sd_dif_op(SCpnt, sdkp->protection_type, scsi_prot_sg_count(SCpnt));
|
|
|
|
/*
|
|
* 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;
|
|
SCpnt->timeout_per_command = timeout;
|
|
|
|
/*
|
|
* This indicates that the command is ready from our end to be
|
|
* queued.
|
|
*/
|
|
ret = BLKPREP_OK;
|
|
out:
|
|
return scsi_prep_return(q, rq, ret);
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
**/
|
|
static int sd_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct gendisk *disk = inode->i_bdev->bd_disk;
|
|
struct scsi_disk *sdkp;
|
|
struct scsi_device *sdev;
|
|
int retval;
|
|
|
|
if (!(sdkp = scsi_disk_get(disk)))
|
|
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(inode->i_bdev);
|
|
|
|
/*
|
|
* If the drive is empty, just let the open fail.
|
|
*/
|
|
retval = -ENOMEDIUM;
|
|
if (sdev->removable && !sdkp->media_present &&
|
|
!(filp->f_flags & O_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 && (filp->f_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 (!sdkp->openers++ && 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.
|
|
**/
|
|
static int sd_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct gendisk *disk = inode->i_bdev->bd_disk;
|
|
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 (!--sdkp->openers && 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);
|
|
return 0;
|
|
}
|
|
|
|
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 postive 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 inode * inode, struct file * filp,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct block_device *bdev = inode->i_bdev;
|
|
struct gendisk *disk = bdev->bd_disk;
|
|
struct scsi_device *sdp = scsi_disk(disk)->device;
|
|
void __user *p = (void __user *)arg;
|
|
int error;
|
|
|
|
SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
|
|
disk->disk_name, cmd));
|
|
|
|
/*
|
|
* 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_nonblockable_ioctl(sdp, cmd, p, filp);
|
|
if (!scsi_block_when_processing_errors(sdp) || !error)
|
|
return error;
|
|
|
|
/*
|
|
* 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:
|
|
return scsi_ioctl(sdp, cmd, p);
|
|
default:
|
|
error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p);
|
|
if (error != -ENOTTY)
|
|
return error;
|
|
}
|
|
return scsi_ioctl(sdp, cmd, p);
|
|
}
|
|
|
|
static void set_media_not_present(struct scsi_disk *sdkp)
|
|
{
|
|
sdkp->media_present = 0;
|
|
sdkp->capacity = 0;
|
|
sdkp->device->changed = 1;
|
|
}
|
|
|
|
/**
|
|
* sd_media_changed - check if our medium changed
|
|
* @disk: kernel device descriptor
|
|
*
|
|
* Returns 0 if not applicable or no change; 1 if change
|
|
*
|
|
* Note: this function is invoked from the block subsystem.
|
|
**/
|
|
static int sd_media_changed(struct gendisk *disk)
|
|
{
|
|
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_media_changed\n"));
|
|
|
|
if (!sdp->removable)
|
|
return 0;
|
|
|
|
/*
|
|
* 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);
|
|
retval = 1;
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Unable to test, unit probably not ready. This usually
|
|
* means there is no disc in the drive. Mark as changed,
|
|
* and we will figure it out later once the drive is
|
|
* available again.
|
|
*/
|
|
if (retval || (scsi_sense_valid(sshdr) &&
|
|
/* 0x3a is medium not present */
|
|
sshdr->asc == 0x3a)) {
|
|
set_media_not_present(sdkp);
|
|
retval = 1;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* For removable scsi disk we have to recognise the presence
|
|
* of a disk in the drive. This is kept in the struct scsi_disk
|
|
* struct and tested at open ! Daniel Roche (dan@lectra.fr)
|
|
*/
|
|
sdkp->media_present = 1;
|
|
|
|
retval = sdp->changed;
|
|
sdp->changed = 0;
|
|
out:
|
|
if (retval != sdkp->previous_state)
|
|
sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
|
|
sdkp->previous_state = retval;
|
|
kfree(sshdr);
|
|
return retval;
|
|
}
|
|
|
|
static int sd_sync_cache(struct scsi_disk *sdkp)
|
|
{
|
|
int retries, res;
|
|
struct scsi_device *sdp = sdkp->device;
|
|
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(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
|
|
SD_TIMEOUT, SD_MAX_RETRIES);
|
|
if (res == 0)
|
|
break;
|
|
}
|
|
|
|
if (res) {
|
|
sd_print_result(sdkp, res);
|
|
if (driver_byte(res) & DRIVER_SENSE)
|
|
sd_print_sense_hdr(sdkp, &sshdr);
|
|
}
|
|
|
|
if (res)
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
static void sd_prepare_flush(struct request_queue *q, struct request *rq)
|
|
{
|
|
rq->cmd_type = REQ_TYPE_BLOCK_PC;
|
|
rq->timeout = SD_TIMEOUT;
|
|
rq->cmd[0] = SYNCHRONIZE_CACHE;
|
|
rq->cmd_len = 10;
|
|
}
|
|
|
|
static void sd_rescan(struct device *dev)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
|
|
|
|
if (sdkp) {
|
|
sd_revalidate_disk(sdkp->disk);
|
|
scsi_disk_put(sdkp);
|
|
}
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
/*
|
|
* This gets directly called from VFS. When the ioctl
|
|
* is not recognized we go back to the other translation paths.
|
|
*/
|
|
static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
|
|
struct gendisk *disk = bdev->bd_disk;
|
|
struct scsi_device *sdev = scsi_disk(disk)->device;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (!scsi_block_when_processing_errors(sdev))
|
|
return -ENODEV;
|
|
|
|
if (sdev->host->hostt->compat_ioctl) {
|
|
int ret;
|
|
|
|
ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Let the static ioctl translation table take care of it.
|
|
*/
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
#endif
|
|
|
|
static 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
|
|
.media_changed = sd_media_changed,
|
|
.revalidate_disk = sd_revalidate_disk,
|
|
};
|
|
|
|
static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
|
|
{
|
|
u64 start_lba = scmd->request->sector;
|
|
u64 end_lba = scmd->request->sector + (scsi_bufflen(scmd) / 512);
|
|
u64 bad_lba;
|
|
int info_valid;
|
|
|
|
if (!blk_fs_request(scmd->request))
|
|
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;
|
|
|
|
if (scmd->device->sector_size < 512) {
|
|
/* only legitimate sector_size here is 256 */
|
|
start_lba <<= 1;
|
|
end_lba <<= 1;
|
|
} else {
|
|
/* be careful ... don't want any overflows */
|
|
u64 factor = scmd->device->sector_size / 512;
|
|
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.
|
|
*/
|
|
return (bad_lba - start_lba) * scmd->device->sector_size;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
int sense_valid = 0;
|
|
int sense_deferred = 0;
|
|
|
|
if (result) {
|
|
sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
|
|
if (sense_valid)
|
|
sense_deferred = scsi_sense_is_deferred(&sshdr);
|
|
}
|
|
#ifdef CONFIG_SCSI_LOGGING
|
|
SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
|
|
if (sense_valid) {
|
|
SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
|
|
"sd_done: sb[respc,sk,asc,"
|
|
"ascq]=%x,%x,%x,%x\n",
|
|
sshdr.response_code,
|
|
sshdr.sense_key, sshdr.asc,
|
|
sshdr.ascq));
|
|
}
|
|
#endif
|
|
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:
|
|
case NO_SENSE:
|
|
/* Inform the user, but make sure that it's not treated
|
|
* as a hard error.
|
|
*/
|
|
scsi_print_sense("sd", SCpnt);
|
|
SCpnt->result = 0;
|
|
memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
|
|
good_bytes = scsi_bufflen(SCpnt);
|
|
break;
|
|
case ABORTED_COMMAND:
|
|
if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */
|
|
scsi_print_result(SCpnt);
|
|
scsi_print_sense("sd", SCpnt);
|
|
good_bytes = sd_completed_bytes(SCpnt);
|
|
}
|
|
break;
|
|
case ILLEGAL_REQUEST:
|
|
if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */
|
|
scsi_print_result(SCpnt);
|
|
scsi_print_sense("sd", SCpnt);
|
|
good_bytes = sd_completed_bytes(SCpnt);
|
|
}
|
|
if (!scsi_device_protection(SCpnt->device) &&
|
|
SCpnt->device->use_10_for_rw &&
|
|
(SCpnt->cmnd[0] == READ_10 ||
|
|
SCpnt->cmnd[0] == WRITE_10))
|
|
SCpnt->device->use_10_for_rw = 0;
|
|
if (SCpnt->device->use_10_for_ms &&
|
|
(SCpnt->cmnd[0] == MODE_SENSE_10 ||
|
|
SCpnt->cmnd[0] == MODE_SELECT_10))
|
|
SCpnt->device->use_10_for_ms = 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
out:
|
|
if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
|
|
sd_dif_complete(SCpnt, good_bytes);
|
|
|
|
return good_bytes;
|
|
}
|
|
|
|
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 */
|
|
if (sshdr->sense_key != NOT_READY &&
|
|
sshdr->sense_key != UNIT_ATTENTION)
|
|
return 0;
|
|
if (sshdr->asc != 0x3A) /* medium not present */
|
|
return 0;
|
|
|
|
set_media_not_present(sdkp);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* 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_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
|
|
sd_print_result(sdkp, the_result);
|
|
}
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* The device does not want the automatic start to be issued.
|
|
*/
|
|
if (sdkp->device->no_start_on_add) {
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If manual intervention is required, or this is an
|
|
* absent USB storage device, a spinup is meaningless.
|
|
*/
|
|
if (sense_valid &&
|
|
sshdr.sense_key == NOT_READY &&
|
|
sshdr.asc == 4 && sshdr.ascq == 3) {
|
|
break; /* manual intervention required */
|
|
|
|
/*
|
|
* Issue command to spin up drive when not ready
|
|
*/
|
|
} else if (sense_valid && sshdr.sense_key == 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);
|
|
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.
|
|
*/
|
|
void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
|
|
{
|
|
struct scsi_device *sdp = sdkp->device;
|
|
u8 type;
|
|
|
|
if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
|
|
type = 0;
|
|
else
|
|
type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
|
|
|
|
switch (type) {
|
|
case SD_DIF_TYPE0_PROTECTION:
|
|
sdkp->protection_type = 0;
|
|
break;
|
|
|
|
case SD_DIF_TYPE1_PROTECTION:
|
|
case SD_DIF_TYPE3_PROTECTION:
|
|
sdkp->protection_type = type;
|
|
break;
|
|
|
|
case SD_DIF_TYPE2_PROTECTION:
|
|
sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \
|
|
"protection which is currently unsupported. " \
|
|
"Disabling disk!\n");
|
|
goto disable;
|
|
|
|
default:
|
|
sd_printk(KERN_ERR, sdkp, "formatted with unknown " \
|
|
"protection type %d. Disabling disk!\n", type);
|
|
goto disable;
|
|
}
|
|
|
|
return;
|
|
|
|
disable:
|
|
sdkp->protection_type = 0;
|
|
sdkp->capacity = 0;
|
|
}
|
|
|
|
/*
|
|
* read disk capacity
|
|
*/
|
|
static void
|
|
sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
|
|
{
|
|
unsigned char cmd[16];
|
|
int the_result, retries;
|
|
int sector_size = 0;
|
|
/* Force READ CAPACITY(16) when PROTECT=1 */
|
|
int longrc = scsi_device_protection(sdkp->device) ? 1 : 0;
|
|
struct scsi_sense_hdr sshdr;
|
|
int sense_valid = 0;
|
|
struct scsi_device *sdp = sdkp->device;
|
|
|
|
repeat:
|
|
retries = 3;
|
|
do {
|
|
if (longrc) {
|
|
memset((void *) cmd, 0, 16);
|
|
cmd[0] = SERVICE_ACTION_IN;
|
|
cmd[1] = SAI_READ_CAPACITY_16;
|
|
cmd[13] = 13;
|
|
memset((void *) buffer, 0, 13);
|
|
} else {
|
|
cmd[0] = READ_CAPACITY;
|
|
memset((void *) &cmd[1], 0, 9);
|
|
memset((void *) buffer, 0, 8);
|
|
}
|
|
|
|
the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
|
|
buffer, longrc ? 13 : 8, &sshdr,
|
|
SD_TIMEOUT, SD_MAX_RETRIES);
|
|
|
|
if (media_not_present(sdkp, &sshdr))
|
|
return;
|
|
|
|
if (the_result)
|
|
sense_valid = scsi_sense_valid(&sshdr);
|
|
retries--;
|
|
|
|
} while (the_result && retries);
|
|
|
|
if (the_result && !longrc) {
|
|
sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
|
|
sd_print_result(sdkp, 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)
|
|
sdp->changed = 1;
|
|
|
|
/* Either no media are present but the drive didn't tell us,
|
|
or they are present but the read capacity command fails */
|
|
/* sdkp->media_present = 0; -- not always correct */
|
|
sdkp->capacity = 0; /* unknown mapped to zero - as usual */
|
|
|
|
return;
|
|
} else if (the_result && longrc) {
|
|
/* READ CAPACITY(16) has been failed */
|
|
sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
|
|
sd_print_result(sdkp, the_result);
|
|
sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");
|
|
|
|
sdkp->capacity = 1 + (sector_t) 0xffffffff;
|
|
goto got_data;
|
|
}
|
|
|
|
if (!longrc) {
|
|
sector_size = (buffer[4] << 24) |
|
|
(buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
|
|
if (buffer[0] == 0xff && buffer[1] == 0xff &&
|
|
buffer[2] == 0xff && buffer[3] == 0xff) {
|
|
if(sizeof(sdkp->capacity) > 4) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Very big device. "
|
|
"Trying to use READ CAPACITY(16).\n");
|
|
longrc = 1;
|
|
goto repeat;
|
|
}
|
|
sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
|
|
"a kernel compiled with support for large "
|
|
"block devices.\n");
|
|
sdkp->capacity = 0;
|
|
goto got_data;
|
|
}
|
|
sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
|
|
(buffer[1] << 16) |
|
|
(buffer[2] << 8) |
|
|
buffer[3]);
|
|
} else {
|
|
sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
|
|
((u64)buffer[1] << 48) |
|
|
((u64)buffer[2] << 40) |
|
|
((u64)buffer[3] << 32) |
|
|
((sector_t)buffer[4] << 24) |
|
|
((sector_t)buffer[5] << 16) |
|
|
((sector_t)buffer[6] << 8) |
|
|
(sector_t)buffer[7]);
|
|
|
|
sector_size = (buffer[8] << 24) |
|
|
(buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
|
|
|
|
sd_read_protection_type(sdkp, buffer);
|
|
}
|
|
|
|
/* Some devices return the total number of sectors, not the
|
|
* highest sector number. Make the necessary adjustment. */
|
|
if (sdp->fix_capacity) {
|
|
--sdkp->capacity;
|
|
|
|
/* Some devices have version which report the correct sizes
|
|
* and others which do not. We guess size according to a heuristic
|
|
* and err on the side of lowering the capacity. */
|
|
} else {
|
|
if (sdp->guess_capacity)
|
|
if (sdkp->capacity & 0x01) /* odd sizes are odd */
|
|
--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 &&
|
|
sector_size != 256) {
|
|
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;
|
|
}
|
|
{
|
|
/*
|
|
* The msdos fs needs to know the hardware sector size
|
|
* So I have created this table. See ll_rw_blk.c
|
|
* Jacques Gelinas (Jacques@solucorp.qc.ca)
|
|
*/
|
|
int hard_sector = sector_size;
|
|
sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
|
|
struct request_queue *queue = sdp->request_queue;
|
|
sector_t mb = sz;
|
|
|
|
blk_queue_hardsect_size(queue, hard_sector);
|
|
/* avoid 64-bit division on 32-bit platforms */
|
|
sector_div(sz, 625);
|
|
mb -= sz - 974;
|
|
sector_div(mb, 1950);
|
|
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"%llu %d-byte hardware sectors (%llu MB)\n",
|
|
(unsigned long long)sdkp->capacity,
|
|
hard_sector, (unsigned long long)mb);
|
|
}
|
|
|
|
/* 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;
|
|
else if (sector_size == 256)
|
|
sdkp->capacity >>= 1;
|
|
|
|
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;
|
|
|
|
set_disk_ro(sdkp->disk, 0);
|
|
if (sdp->skip_ms_page_3f) {
|
|
sd_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_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);
|
|
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;
|
|
struct scsi_mode_data data;
|
|
struct scsi_sense_hdr sshdr;
|
|
|
|
if (sdp->skip_ms_page_8)
|
|
goto defaults;
|
|
|
|
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, 4, &data, &sshdr);
|
|
|
|
if (!scsi_status_is_good(res))
|
|
goto bad_sense;
|
|
|
|
if (!data.header_length) {
|
|
modepage = 6;
|
|
sd_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;
|
|
if (len > 20)
|
|
len = 20;
|
|
|
|
/* Take headers and block descriptors into account */
|
|
len += data.header_length + data.block_descriptor_length;
|
|
if (len > SD_BUF_SIZE)
|
|
goto bad_sense;
|
|
|
|
/* Get the data */
|
|
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;
|
|
|
|
if (offset >= SD_BUF_SIZE - 2) {
|
|
sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
|
|
goto defaults;
|
|
}
|
|
|
|
if ((buffer[offset] & 0x3f) != modepage) {
|
|
sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
|
|
goto defaults;
|
|
}
|
|
|
|
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 (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
|
|
sd_printk(KERN_NOTICE, sdkp,
|
|
"Uses READ/WRITE(6), disabling FUA\n");
|
|
sdkp->DPOFUA = 0;
|
|
}
|
|
|
|
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_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
|
|
else
|
|
sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
|
|
|
|
defaults:
|
|
sd_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.
|
|
*/
|
|
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_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_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
|
|
return;
|
|
}
|
|
|
|
if ((buffer[offset + 5] & 0x80) == 0)
|
|
return;
|
|
|
|
sdkp->ATO = 1;
|
|
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* 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 ordered;
|
|
|
|
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;
|
|
}
|
|
|
|
/* defaults, until the device tells us otherwise */
|
|
sdp->sector_size = 512;
|
|
sdkp->capacity = 0;
|
|
sdkp->media_present = 1;
|
|
sdkp->write_prot = 0;
|
|
sdkp->WCE = 0;
|
|
sdkp->RCD = 0;
|
|
sdkp->ATO = 0;
|
|
|
|
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);
|
|
sd_read_write_protect_flag(sdkp, buffer);
|
|
sd_read_cache_type(sdkp, buffer);
|
|
sd_read_app_tag_own(sdkp, buffer);
|
|
}
|
|
|
|
/*
|
|
* We now have all cache related info, determine how we deal
|
|
* with ordered requests. Note that as the current SCSI
|
|
* dispatch function can alter request order, we cannot use
|
|
* QUEUE_ORDERED_TAG_* even when ordered tag is supported.
|
|
*/
|
|
if (sdkp->WCE)
|
|
ordered = sdkp->DPOFUA
|
|
? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
|
|
else
|
|
ordered = QUEUE_ORDERED_DRAIN;
|
|
|
|
blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
|
|
|
|
set_capacity(disk, sdkp->capacity);
|
|
kfree(buffer);
|
|
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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_attach is not re-entrant (for time being)
|
|
* Also think about sd_attach() 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;
|
|
u32 index;
|
|
int error;
|
|
|
|
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_attach\n"));
|
|
|
|
error = -ENOMEM;
|
|
sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
|
|
if (!sdkp)
|
|
goto out;
|
|
|
|
gd = alloc_disk(16);
|
|
if (!gd)
|
|
goto out_free;
|
|
|
|
do {
|
|
if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
|
|
goto out_put;
|
|
|
|
error = ida_get_new(&sd_index_ida, &index);
|
|
} while (error == -EAGAIN);
|
|
|
|
if (error)
|
|
goto out_put;
|
|
|
|
error = -EBUSY;
|
|
if (index >= SD_MAX_DISKS)
|
|
goto out_free_index;
|
|
|
|
sdkp->device = sdp;
|
|
sdkp->driver = &sd_template;
|
|
sdkp->disk = gd;
|
|
sdkp->index = index;
|
|
sdkp->openers = 0;
|
|
sdkp->previous_state = 1;
|
|
|
|
if (!sdp->timeout) {
|
|
if (sdp->type != TYPE_MOD)
|
|
sdp->timeout = SD_TIMEOUT;
|
|
else
|
|
sdp->timeout = SD_MOD_TIMEOUT;
|
|
}
|
|
|
|
device_initialize(&sdkp->dev);
|
|
sdkp->dev.parent = &sdp->sdev_gendev;
|
|
sdkp->dev.class = &sd_disk_class;
|
|
strncpy(sdkp->dev.bus_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
|
|
|
|
if (device_add(&sdkp->dev))
|
|
goto out_free_index;
|
|
|
|
get_device(&sdp->sdev_gendev);
|
|
|
|
gd->major = sd_major((index & 0xf0) >> 4);
|
|
gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
|
|
gd->minors = 16;
|
|
gd->fops = &sd_fops;
|
|
|
|
if (index < 26) {
|
|
sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
|
|
} else if (index < (26 + 1) * 26) {
|
|
sprintf(gd->disk_name, "sd%c%c",
|
|
'a' + index / 26 - 1,'a' + index % 26);
|
|
} else {
|
|
const unsigned int m1 = (index / 26 - 1) / 26 - 1;
|
|
const unsigned int m2 = (index / 26 - 1) % 26;
|
|
const unsigned int m3 = index % 26;
|
|
sprintf(gd->disk_name, "sd%c%c%c",
|
|
'a' + m1, 'a' + m2, 'a' + m3);
|
|
}
|
|
|
|
gd->private_data = &sdkp->driver;
|
|
gd->queue = sdkp->device->request_queue;
|
|
|
|
sd_revalidate_disk(gd);
|
|
|
|
blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
|
|
|
|
gd->driverfs_dev = &sdp->sdev_gendev;
|
|
gd->flags = GENHD_FL_DRIVERFS;
|
|
if (sdp->removable)
|
|
gd->flags |= GENHD_FL_REMOVABLE;
|
|
|
|
dev_set_drvdata(dev, sdkp);
|
|
add_disk(gd);
|
|
sd_dif_config_host(sdkp);
|
|
|
|
sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
|
|
sdp->removable ? "removable " : "");
|
|
|
|
return 0;
|
|
|
|
out_free_index:
|
|
ida_remove(&sd_index_ida, index);
|
|
out_put:
|
|
put_disk(gd);
|
|
out_free:
|
|
kfree(sdkp);
|
|
out:
|
|
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_get_drvdata(dev);
|
|
|
|
device_del(&sdkp->dev);
|
|
del_gendisk(sdkp->disk);
|
|
sd_shutdown(dev);
|
|
|
|
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;
|
|
|
|
ida_remove(&sd_index_ida, sdkp->index);
|
|
|
|
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(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
|
|
SD_TIMEOUT, SD_MAX_RETRIES);
|
|
if (res) {
|
|
sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
|
|
sd_print_result(sdkp, res);
|
|
if (driver_byte(res) & DRIVER_SENSE)
|
|
sd_print_sense_hdr(sdkp, &sshdr);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* 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 = scsi_disk_get_from_dev(dev);
|
|
|
|
if (!sdkp)
|
|
return; /* this can happen */
|
|
|
|
if (sdkp->WCE) {
|
|
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);
|
|
}
|
|
|
|
scsi_disk_put(sdkp);
|
|
}
|
|
|
|
static int sd_suspend(struct device *dev, pm_message_t mesg)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
|
|
int ret = 0;
|
|
|
|
if (!sdkp)
|
|
return 0; /* this can happen */
|
|
|
|
if (sdkp->WCE) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
|
|
ret = sd_sync_cache(sdkp);
|
|
if (ret)
|
|
goto done;
|
|
}
|
|
|
|
if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
|
|
sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
|
|
ret = sd_start_stop_device(sdkp, 0);
|
|
}
|
|
|
|
done:
|
|
scsi_disk_put(sdkp);
|
|
return ret;
|
|
}
|
|
|
|
static int sd_resume(struct device *dev)
|
|
{
|
|
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
|
|
int ret = 0;
|
|
|
|
if (!sdkp->device->manage_start_stop)
|
|
goto done;
|
|
|
|
sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
|
|
ret = sd_start_stop_device(sdkp, 1);
|
|
|
|
done:
|
|
scsi_disk_put(sdkp);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
majors++;
|
|
|
|
if (!majors)
|
|
return -ENODEV;
|
|
|
|
err = class_register(&sd_disk_class);
|
|
if (err)
|
|
goto err_out;
|
|
|
|
err = scsi_register_driver(&sd_template.gendrv);
|
|
if (err)
|
|
goto err_out_class;
|
|
|
|
return 0;
|
|
|
|
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);
|
|
class_unregister(&sd_disk_class);
|
|
|
|
for (i = 0; i < SD_MAJORS; i++)
|
|
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)
|
|
{
|
|
sd_printk(KERN_INFO, sdkp, "");
|
|
scsi_show_sense_hdr(sshdr);
|
|
sd_printk(KERN_INFO, sdkp, "");
|
|
scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
|
|
}
|
|
|
|
static void sd_print_result(struct scsi_disk *sdkp, int result)
|
|
{
|
|
sd_printk(KERN_INFO, sdkp, "");
|
|
scsi_show_result(result);
|
|
}
|
|
|