Revision 0740a50b9baa4472cfb12442df4b39e2712a64a4 authored by Mike Rapoport on 13 March 2021, 05:07:12 UTC, committed by Linus Torvalds on 13 March 2021, 19:27:30 UTC
There could be struct pages that are not backed by actual physical memory. This can happen when the actual memory bank is not a multiple of SECTION_SIZE or when an architecture does not register memory holes reserved by the firmware as memblock.memory. Such pages are currently initialized using init_unavailable_mem() function that iterates through PFNs in holes in memblock.memory and if there is a struct page corresponding to a PFN, the fields of this page are set to default values and it is marked as Reserved. init_unavailable_mem() does not take into account zone and node the page belongs to and sets both zone and node links in struct page to zero. Before commit 73a6e474cb37 ("mm: memmap_init: iterate over memblock regions rather that check each PFN") the holes inside a zone were re-initialized during memmap_init() and got their zone/node links right. However, after that commit nothing updates the struct pages representing such holes. On a system that has firmware reserved holes in a zone above ZONE_DMA, for instance in a configuration below: # grep -A1 E820 /proc/iomem 7a17b000-7a216fff : Unknown E820 type 7a217000-7bffffff : System RAM unset zone link in struct page will trigger VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn), page); in set_pfnblock_flags_mask() when called with a struct page from a range other than E820_TYPE_RAM because there are pages in the range of ZONE_DMA32 but the unset zone link in struct page makes them appear as a part of ZONE_DMA. Interleave initialization of the unavailable pages with the normal initialization of memory map, so that zone and node information will be properly set on struct pages that are not backed by the actual memory. With this change the pages for holes inside a zone will get proper zone/node links and the pages that are not spanned by any node will get links to the adjacent zone/node. The holes between nodes will be prepended to the zone/node above the hole and the trailing pages in the last section that will be appended to the zone/node below. [akpm@linux-foundation.org: don't initialize static to zero, use %llu for u64] Link: https://lkml.kernel.org/r/20210225224351.7356-2-rppt@kernel.org Fixes: 73a6e474cb37 ("mm: memmap_init: iterate over memblock regions rather that check each PFN") Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Reported-by: Qian Cai <cai@lca.pw> Reported-by: Andrea Arcangeli <aarcange@redhat.com> Reviewed-by: Baoquan He <bhe@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: David Hildenbrand <david@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ćukasz Majczak <lma@semihalf.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Michal Hocko <mhocko@kernel.org> Cc: "Sarvela, Tomi P" <tomi.p.sarvela@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent ea29b20
sr.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* sr.c Copyright (C) 1992 David Giller
* Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
*
* adapted from:
* sd.c Copyright (C) 1992 Drew Eckhardt
* Linux scsi disk driver by
* Drew Eckhardt <drew@colorado.edu>
*
* Modified by Eric Youngdale ericy@andante.org to
* add scatter-gather, multiple outstanding request, and other
* enhancements.
*
* Modified by Eric Youngdale eric@andante.org to support loadable
* low-level scsi drivers.
*
* Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
* provide auto-eject.
*
* Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
* generic cdrom interface
*
* Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
* interface, capabilities probe additions, ioctl cleanups, etc.
*
* Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
*
* Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
* transparently and lose the GHOST hack
*
* Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
* check resource allocation in sr_init and some cleanups
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/bio.h>
#include <linux/compat.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/cdrom.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/blk-pm.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */
#include "scsi_logging.h"
#include "sr.h"
MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
#define SR_DISKS 256
#define SR_CAPABILITIES \
(CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
CDC_MRW|CDC_MRW_W|CDC_RAM)
static int sr_probe(struct device *);
static int sr_remove(struct device *);
static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt);
static int sr_done(struct scsi_cmnd *);
static int sr_runtime_suspend(struct device *dev);
static const struct dev_pm_ops sr_pm_ops = {
.runtime_suspend = sr_runtime_suspend,
};
static struct scsi_driver sr_template = {
.gendrv = {
.name = "sr",
.owner = THIS_MODULE,
.probe = sr_probe,
.remove = sr_remove,
.pm = &sr_pm_ops,
},
.init_command = sr_init_command,
.done = sr_done,
};
static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
static DEFINE_SPINLOCK(sr_index_lock);
/* 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(sr_ref_mutex);
static int sr_open(struct cdrom_device_info *, int);
static void sr_release(struct cdrom_device_info *);
static void get_sectorsize(struct scsi_cd *);
static void get_capabilities(struct scsi_cd *);
static unsigned int sr_check_events(struct cdrom_device_info *cdi,
unsigned int clearing, int slot);
static int sr_packet(struct cdrom_device_info *, struct packet_command *);
static const struct cdrom_device_ops sr_dops = {
.open = sr_open,
.release = sr_release,
.drive_status = sr_drive_status,
.check_events = sr_check_events,
.tray_move = sr_tray_move,
.lock_door = sr_lock_door,
.select_speed = sr_select_speed,
.get_last_session = sr_get_last_session,
.get_mcn = sr_get_mcn,
.reset = sr_reset,
.audio_ioctl = sr_audio_ioctl,
.capability = SR_CAPABILITIES,
.generic_packet = sr_packet,
};
static void sr_kref_release(struct kref *kref);
static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
{
return container_of(disk->private_data, struct scsi_cd, driver);
}
static int sr_runtime_suspend(struct device *dev)
{
struct scsi_cd *cd = dev_get_drvdata(dev);
if (!cd) /* E.g.: runtime suspend following sr_remove() */
return 0;
if (cd->media_present)
return -EBUSY;
else
return 0;
}
/*
* The get and put routines for the struct scsi_cd. Note this entity
* has a scsi_device pointer and owns a reference to this.
*/
static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
{
struct scsi_cd *cd = NULL;
mutex_lock(&sr_ref_mutex);
if (disk->private_data == NULL)
goto out;
cd = scsi_cd(disk);
kref_get(&cd->kref);
if (scsi_device_get(cd->device)) {
kref_put(&cd->kref, sr_kref_release);
cd = NULL;
}
out:
mutex_unlock(&sr_ref_mutex);
return cd;
}
static void scsi_cd_put(struct scsi_cd *cd)
{
struct scsi_device *sdev = cd->device;
mutex_lock(&sr_ref_mutex);
kref_put(&cd->kref, sr_kref_release);
scsi_device_put(sdev);
mutex_unlock(&sr_ref_mutex);
}
static unsigned int sr_get_events(struct scsi_device *sdev)
{
u8 buf[8];
u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,
1, /* polled */
0, 0, /* reserved */
1 << 4, /* notification class: media */
0, 0, /* reserved */
0, sizeof(buf), /* allocation length */
0, /* control */
};
struct event_header *eh = (void *)buf;
struct media_event_desc *med = (void *)(buf + 4);
struct scsi_sense_hdr sshdr;
int result;
result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf),
&sshdr, SR_TIMEOUT, MAX_RETRIES, NULL);
if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION)
return DISK_EVENT_MEDIA_CHANGE;
if (result || be16_to_cpu(eh->data_len) < sizeof(*med))
return 0;
if (eh->nea || eh->notification_class != 0x4)
return 0;
if (med->media_event_code == 1)
return DISK_EVENT_EJECT_REQUEST;
else if (med->media_event_code == 2)
return DISK_EVENT_MEDIA_CHANGE;
return 0;
}
/*
* This function checks to see if the media has been changed or eject
* button has been pressed. It is possible that we have already
* sensed a change, or the drive may have sensed one and not yet
* reported it. The past events are accumulated in sdev->changed and
* returned together with the current state.
*/
static unsigned int sr_check_events(struct cdrom_device_info *cdi,
unsigned int clearing, int slot)
{
struct scsi_cd *cd = cdi->handle;
bool last_present;
struct scsi_sense_hdr sshdr;
unsigned int events;
int ret;
/* no changer support */
if (CDSL_CURRENT != slot)
return 0;
events = sr_get_events(cd->device);
cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;
/*
* If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree
* for several times in a row. We rely on TUR only for this likely
* broken device, to prevent generating incorrect media changed
* events for every open().
*/
if (cd->ignore_get_event) {
events &= ~DISK_EVENT_MEDIA_CHANGE;
goto do_tur;
}
/*
* GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE
* is being cleared. Note that there are devices which hang
* if asked to execute TUR repeatedly.
*/
if (cd->device->changed) {
events |= DISK_EVENT_MEDIA_CHANGE;
cd->device->changed = 0;
cd->tur_changed = true;
}
if (!(clearing & DISK_EVENT_MEDIA_CHANGE))
return events;
do_tur:
/* let's see whether the media is there with TUR */
last_present = cd->media_present;
ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
/*
* Media is considered to be present if TUR succeeds or fails with
* sense data indicating something other than media-not-present
* (ASC 0x3a).
*/
cd->media_present = scsi_status_is_good(ret) ||
(scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);
if (last_present != cd->media_present)
cd->device->changed = 1;
if (cd->device->changed) {
events |= DISK_EVENT_MEDIA_CHANGE;
cd->device->changed = 0;
cd->tur_changed = true;
}
if (cd->ignore_get_event)
return events;
/* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */
if (!cd->tur_changed) {
if (cd->get_event_changed) {
if (cd->tur_mismatch++ > 8) {
sr_printk(KERN_WARNING, cd,
"GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");
cd->ignore_get_event = true;
}
} else {
cd->tur_mismatch = 0;
}
}
cd->tur_changed = false;
cd->get_event_changed = false;
return events;
}
/*
* sr_done is the interrupt routine for the device driver.
*
* It will be notified on the end of a SCSI read / write, and will take one
* of several actions based on success or failure.
*/
static int sr_done(struct scsi_cmnd *SCpnt)
{
int result = SCpnt->result;
int this_count = scsi_bufflen(SCpnt);
int good_bytes = (result == 0 ? this_count : 0);
int block_sectors = 0;
long error_sector;
struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
#ifdef DEBUG
scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);
#endif
/*
* Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
* success. Since this is a relatively rare error condition, no
* care is taken to avoid unnecessary additional work such as
* memcpy's that could be avoided.
*/
if (driver_byte(result) != 0 && /* An error occurred */
(SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
switch (SCpnt->sense_buffer[2]) {
case MEDIUM_ERROR:
case VOLUME_OVERFLOW:
case ILLEGAL_REQUEST:
if (!(SCpnt->sense_buffer[0] & 0x90))
break;
error_sector =
get_unaligned_be32(&SCpnt->sense_buffer[3]);
if (SCpnt->request->bio != NULL)
block_sectors =
bio_sectors(SCpnt->request->bio);
if (block_sectors < 4)
block_sectors = 4;
if (cd->device->sector_size == 2048)
error_sector <<= 2;
error_sector &= ~(block_sectors - 1);
good_bytes = (error_sector -
blk_rq_pos(SCpnt->request)) << 9;
if (good_bytes < 0 || good_bytes >= this_count)
good_bytes = 0;
/*
* The SCSI specification allows for the value
* returned by READ CAPACITY to be up to 75 2K
* sectors past the last readable block.
* Therefore, if we hit a medium error within the
* last 75 2K sectors, we decrease the saved size
* value.
*/
if (error_sector < get_capacity(cd->disk) &&
cd->capacity - error_sector < 4 * 75)
set_capacity(cd->disk, error_sector);
break;
case RECOVERED_ERROR:
good_bytes = this_count;
break;
default:
break;
}
}
return good_bytes;
}
static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
{
int block = 0, this_count, s_size;
struct scsi_cd *cd;
struct request *rq = SCpnt->request;
blk_status_t ret;
ret = scsi_alloc_sgtables(SCpnt);
if (ret != BLK_STS_OK)
return ret;
cd = scsi_cd(rq->rq_disk);
SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
"Doing sr request, block = %d\n", block));
if (!cd->device || !scsi_device_online(cd->device)) {
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 (cd->device->changed) {
/*
* quietly refuse to do anything to a changed disc until the
* changed bit has been reset
*/
goto out;
}
s_size = cd->device->sector_size;
if (s_size != 512 && s_size != 1024 && s_size != 2048) {
scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
goto out;
}
switch (req_op(rq)) {
case REQ_OP_WRITE:
if (!cd->writeable)
goto out;
SCpnt->cmnd[0] = WRITE_10;
cd->cdi.media_written = 1;
break;
case REQ_OP_READ:
SCpnt->cmnd[0] = READ_10;
break;
default:
blk_dump_rq_flags(rq, "Unknown sr command");
goto out;
}
{
struct scatterlist *sg;
int i, size = 0, sg_count = scsi_sg_count(SCpnt);
scsi_for_each_sg(SCpnt, sg, sg_count, i)
size += sg->length;
if (size != scsi_bufflen(SCpnt)) {
scmd_printk(KERN_ERR, SCpnt,
"mismatch count %d, bytes %d\n",
size, scsi_bufflen(SCpnt));
if (scsi_bufflen(SCpnt) > size)
SCpnt->sdb.length = size;
}
}
/*
* request doesn't start on hw block boundary, add scatter pads
*/
if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
(scsi_bufflen(SCpnt) % s_size)) {
scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
goto out;
}
this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
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)));
SCpnt->cmnd[1] = 0;
block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
if (this_count > 0xffff) {
this_count = 0xffff;
SCpnt->sdb.length = this_count * s_size;
}
put_unaligned_be32(block, &SCpnt->cmnd[2]);
SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
put_unaligned_be16(this_count, &SCpnt->cmnd[7]);
/*
* 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 = cd->device->sector_size;
SCpnt->underflow = this_count << 9;
SCpnt->allowed = MAX_RETRIES;
SCpnt->cmd_len = 10;
/*
* This indicates that the command is ready from our end to be queued.
*/
return BLK_STS_OK;
out:
scsi_free_sgtables(SCpnt);
return BLK_STS_IOERR;
}
static void sr_revalidate_disk(struct scsi_cd *cd)
{
struct scsi_sense_hdr sshdr;
/* if the unit is not ready, nothing more to do */
if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
return;
sr_cd_check(&cd->cdi);
get_sectorsize(cd);
}
static int sr_block_open(struct block_device *bdev, fmode_t mode)
{
struct scsi_cd *cd;
struct scsi_device *sdev;
int ret = -ENXIO;
cd = scsi_cd_get(bdev->bd_disk);
if (!cd)
goto out;
sdev = cd->device;
scsi_autopm_get_device(sdev);
if (bdev_check_media_change(bdev))
sr_revalidate_disk(cd);
mutex_lock(&cd->lock);
ret = cdrom_open(&cd->cdi, bdev, mode);
mutex_unlock(&cd->lock);
scsi_autopm_put_device(sdev);
if (ret)
scsi_cd_put(cd);
out:
return ret;
}
static void sr_block_release(struct gendisk *disk, fmode_t mode)
{
struct scsi_cd *cd = scsi_cd(disk);
mutex_lock(&cd->lock);
cdrom_release(&cd->cdi, mode);
mutex_unlock(&cd->lock);
scsi_cd_put(cd);
}
static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
unsigned long arg)
{
struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
struct scsi_device *sdev = cd->device;
void __user *argp = (void __user *)arg;
int ret;
mutex_lock(&cd->lock);
ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
(mode & FMODE_NDELAY) != 0);
if (ret)
goto out;
scsi_autopm_get_device(sdev);
/*
* Send SCSI addressing ioctls directly to mid level, send other
* ioctls to cdrom/block level.
*/
switch (cmd) {
case SCSI_IOCTL_GET_IDLUN:
case SCSI_IOCTL_GET_BUS_NUMBER:
ret = scsi_ioctl(sdev, cmd, argp);
goto put;
}
ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
if (ret != -ENOSYS)
goto put;
ret = scsi_ioctl(sdev, cmd, argp);
put:
scsi_autopm_put_device(sdev);
out:
mutex_unlock(&cd->lock);
return ret;
}
#ifdef CONFIG_COMPAT
static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
unsigned long arg)
{
struct scsi_cd *cd = scsi_cd(bdev->bd_disk);
struct scsi_device *sdev = cd->device;
void __user *argp = compat_ptr(arg);
int ret;
mutex_lock(&cd->lock);
ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,
(mode & FMODE_NDELAY) != 0);
if (ret)
goto out;
scsi_autopm_get_device(sdev);
/*
* Send SCSI addressing ioctls directly to mid level, send other
* ioctls to cdrom/block level.
*/
switch (cmd) {
case SCSI_IOCTL_GET_IDLUN:
case SCSI_IOCTL_GET_BUS_NUMBER:
ret = scsi_compat_ioctl(sdev, cmd, argp);
goto put;
}
ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp);
if (ret != -ENOSYS)
goto put;
ret = scsi_compat_ioctl(sdev, cmd, argp);
put:
scsi_autopm_put_device(sdev);
out:
mutex_unlock(&cd->lock);
return ret;
}
#endif
static unsigned int sr_block_check_events(struct gendisk *disk,
unsigned int clearing)
{
unsigned int ret = 0;
struct scsi_cd *cd;
cd = scsi_cd_get(disk);
if (!cd)
return 0;
if (!atomic_read(&cd->device->disk_events_disable_depth))
ret = cdrom_check_events(&cd->cdi, clearing);
scsi_cd_put(cd);
return ret;
}
static const struct block_device_operations sr_bdops =
{
.owner = THIS_MODULE,
.open = sr_block_open,
.release = sr_block_release,
.ioctl = sr_block_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = sr_block_compat_ioctl,
#endif
.check_events = sr_block_check_events,
};
static int sr_open(struct cdrom_device_info *cdi, int purpose)
{
struct scsi_cd *cd = cdi->handle;
struct scsi_device *sdev = cd->device;
int retval;
/*
* 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;
return 0;
error_out:
return retval;
}
static void sr_release(struct cdrom_device_info *cdi)
{
}
static int sr_probe(struct device *dev)
{
struct scsi_device *sdev = to_scsi_device(dev);
struct gendisk *disk;
struct scsi_cd *cd;
int minor, error;
scsi_autopm_get_device(sdev);
error = -ENODEV;
if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)
goto fail;
error = -ENOMEM;
cd = kzalloc(sizeof(*cd), GFP_KERNEL);
if (!cd)
goto fail;
kref_init(&cd->kref);
disk = alloc_disk(1);
if (!disk)
goto fail_free;
mutex_init(&cd->lock);
spin_lock(&sr_index_lock);
minor = find_first_zero_bit(sr_index_bits, SR_DISKS);
if (minor == SR_DISKS) {
spin_unlock(&sr_index_lock);
error = -EBUSY;
goto fail_put;
}
__set_bit(minor, sr_index_bits);
spin_unlock(&sr_index_lock);
disk->major = SCSI_CDROM_MAJOR;
disk->first_minor = minor;
sprintf(disk->disk_name, "sr%d", minor);
disk->fops = &sr_bdops;
disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
cd->device = sdev;
cd->disk = disk;
cd->driver = &sr_template;
cd->disk = disk;
cd->capacity = 0x1fffff;
cd->device->changed = 1; /* force recheck CD type */
cd->media_present = 1;
cd->use = 1;
cd->readcd_known = 0;
cd->readcd_cdda = 0;
cd->cdi.ops = &sr_dops;
cd->cdi.handle = cd;
cd->cdi.mask = 0;
cd->cdi.capacity = 1;
sprintf(cd->cdi.name, "sr%d", minor);
sdev->sector_size = 2048; /* A guess, just in case */
/* FIXME: need to handle a get_capabilities failure properly ?? */
get_capabilities(cd);
sr_vendor_init(cd);
set_capacity(disk, cd->capacity);
disk->private_data = &cd->driver;
disk->queue = sdev->request_queue;
if (register_cdrom(disk, &cd->cdi))
goto fail_minor;
/*
* Initialize block layer runtime PM stuffs before the
* periodic event checking request gets started in add_disk.
*/
blk_pm_runtime_init(sdev->request_queue, dev);
dev_set_drvdata(dev, cd);
disk->flags |= GENHD_FL_REMOVABLE;
sr_revalidate_disk(cd);
device_add_disk(&sdev->sdev_gendev, disk, NULL);
sdev_printk(KERN_DEBUG, sdev,
"Attached scsi CD-ROM %s\n", cd->cdi.name);
scsi_autopm_put_device(cd->device);
return 0;
fail_minor:
spin_lock(&sr_index_lock);
clear_bit(minor, sr_index_bits);
spin_unlock(&sr_index_lock);
fail_put:
put_disk(disk);
mutex_destroy(&cd->lock);
fail_free:
kfree(cd);
fail:
scsi_autopm_put_device(sdev);
return error;
}
static void get_sectorsize(struct scsi_cd *cd)
{
unsigned char cmd[10];
unsigned char buffer[8];
int the_result, retries = 3;
int sector_size;
struct request_queue *queue;
do {
cmd[0] = READ_CAPACITY;
memset((void *) &cmd[1], 0, 9);
memset(buffer, 0, sizeof(buffer));
/* Do the command and wait.. */
the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE,
buffer, sizeof(buffer), NULL,
SR_TIMEOUT, MAX_RETRIES, NULL);
retries--;
} while (the_result && retries);
if (the_result) {
cd->capacity = 0x1fffff;
sector_size = 2048; /* A guess, just in case */
} else {
long last_written;
cd->capacity = 1 + get_unaligned_be32(&buffer[0]);
/*
* READ_CAPACITY doesn't return the correct size on
* certain UDF media. If last_written is larger, use
* it instead.
*
* http://bugzilla.kernel.org/show_bug.cgi?id=9668
*/
if (!cdrom_get_last_written(&cd->cdi, &last_written))
cd->capacity = max_t(long, cd->capacity, last_written);
sector_size = get_unaligned_be32(&buffer[4]);
switch (sector_size) {
/*
* HP 4020i CD-Recorder reports 2340 byte sectors
* Philips CD-Writers report 2352 byte sectors
*
* Use 2k sectors for them..
*/
case 0:
case 2340:
case 2352:
sector_size = 2048;
fallthrough;
case 2048:
cd->capacity *= 4;
fallthrough;
case 512:
break;
default:
sr_printk(KERN_INFO, cd,
"unsupported sector size %d.", sector_size);
cd->capacity = 0;
}
cd->device->sector_size = sector_size;
/*
* Add this so that we have the ability to correctly gauge
* what the device is capable of.
*/
set_capacity(cd->disk, cd->capacity);
}
queue = cd->device->request_queue;
blk_queue_logical_block_size(queue, sector_size);
return;
}
static void get_capabilities(struct scsi_cd *cd)
{
unsigned char *buffer;
struct scsi_mode_data data;
struct scsi_sense_hdr sshdr;
unsigned int ms_len = 128;
int rc, n;
static const char *loadmech[] =
{
"caddy",
"tray",
"pop-up",
"",
"changer",
"cartridge changer",
"",
""
};
/* allocate transfer buffer */
buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
if (!buffer) {
sr_printk(KERN_ERR, cd, "out of memory.\n");
return;
}
/* eat unit attentions */
scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);
/* ask for mode page 0x2a */
rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len,
SR_TIMEOUT, 3, &data, NULL);
if (!scsi_status_is_good(rc) || data.length > ms_len ||
data.header_length + data.block_descriptor_length > data.length) {
/* failed, drive doesn't have capabilities mode page */
cd->cdi.speed = 1;
cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |
CDC_DVD | CDC_DVD_RAM |
CDC_SELECT_DISC | CDC_SELECT_SPEED |
CDC_MRW | CDC_MRW_W | CDC_RAM);
kfree(buffer);
sr_printk(KERN_INFO, cd, "scsi-1 drive");
return;
}
n = data.header_length + data.block_descriptor_length;
cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176;
cd->readcd_known = 1;
cd->readcd_cdda = buffer[n + 5] & 0x01;
/* print some capability bits */
sr_printk(KERN_INFO, cd,
"scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",
get_unaligned_be16(&buffer[n + 14]) / 176,
cd->cdi.speed,
buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */
buffer[n + 3] & 0x20 ? "dvd-ram " : "",
buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */
buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */
buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */
loadmech[buffer[n + 6] >> 5]);
if ((buffer[n + 6] >> 5) == 0)
/* caddy drives can't close tray... */
cd->cdi.mask |= CDC_CLOSE_TRAY;
if ((buffer[n + 2] & 0x8) == 0)
/* not a DVD drive */
cd->cdi.mask |= CDC_DVD;
if ((buffer[n + 3] & 0x20) == 0)
/* can't write DVD-RAM media */
cd->cdi.mask |= CDC_DVD_RAM;
if ((buffer[n + 3] & 0x10) == 0)
/* can't write DVD-R media */
cd->cdi.mask |= CDC_DVD_R;
if ((buffer[n + 3] & 0x2) == 0)
/* can't write CD-RW media */
cd->cdi.mask |= CDC_CD_RW;
if ((buffer[n + 3] & 0x1) == 0)
/* can't write CD-R media */
cd->cdi.mask |= CDC_CD_R;
if ((buffer[n + 6] & 0x8) == 0)
/* can't eject */
cd->cdi.mask |= CDC_OPEN_TRAY;
if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||
(buffer[n + 6] >> 5) == mechtype_cartridge_changer)
cd->cdi.capacity =
cdrom_number_of_slots(&cd->cdi);
if (cd->cdi.capacity <= 1)
/* not a changer */
cd->cdi.mask |= CDC_SELECT_DISC;
/*else I don't think it can close its tray
cd->cdi.mask |= CDC_CLOSE_TRAY; */
/*
* if DVD-RAM, MRW-W or CD-RW, we are randomly writable
*/
if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=
(CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {
cd->writeable = 1;
}
kfree(buffer);
}
/*
* sr_packet() is the entry point for the generic commands generated
* by the Uniform CD-ROM layer.
*/
static int sr_packet(struct cdrom_device_info *cdi,
struct packet_command *cgc)
{
struct scsi_cd *cd = cdi->handle;
struct scsi_device *sdev = cd->device;
if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
return -EDRIVE_CANT_DO_THIS;
if (cgc->timeout <= 0)
cgc->timeout = IOCTL_TIMEOUT;
sr_do_ioctl(cd, cgc);
return cgc->stat;
}
/**
* sr_kref_release - Called to free the scsi_cd structure
* @kref: pointer to embedded kref
*
* sr_ref_mutex must be held entering this routine. Because it is
* called on last put, you should always use the scsi_cd_get()
* scsi_cd_put() helpers which manipulate the semaphore directly
* and never do a direct kref_put().
**/
static void sr_kref_release(struct kref *kref)
{
struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref);
struct gendisk *disk = cd->disk;
spin_lock(&sr_index_lock);
clear_bit(MINOR(disk_devt(disk)), sr_index_bits);
spin_unlock(&sr_index_lock);
unregister_cdrom(&cd->cdi);
disk->private_data = NULL;
put_disk(disk);
mutex_destroy(&cd->lock);
kfree(cd);
}
static int sr_remove(struct device *dev)
{
struct scsi_cd *cd = dev_get_drvdata(dev);
scsi_autopm_get_device(cd->device);
del_gendisk(cd->disk);
dev_set_drvdata(dev, NULL);
mutex_lock(&sr_ref_mutex);
kref_put(&cd->kref, sr_kref_release);
mutex_unlock(&sr_ref_mutex);
return 0;
}
static int __init init_sr(void)
{
int rc;
rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");
if (rc)
return rc;
rc = scsi_register_driver(&sr_template.gendrv);
if (rc)
unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
return rc;
}
static void __exit exit_sr(void)
{
scsi_unregister_driver(&sr_template.gendrv);
unregister_blkdev(SCSI_CDROM_MAJOR, "sr");
}
module_init(init_sr);
module_exit(exit_sr);
MODULE_LICENSE("GPL");
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...