![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
924 lines
23 KiB
C
924 lines
23 KiB
C
/*
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* sr.c Copyright (C) 1992 David Giller
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* Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
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*
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* adapted from:
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* sd.c Copyright (C) 1992 Drew Eckhardt
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* Linux scsi disk driver by
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* Drew Eckhardt <drew@colorado.edu>
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*
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* Modified by Eric Youngdale ericy@andante.org to
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* add scatter-gather, multiple outstanding request, and other
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* enhancements.
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*
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* Modified by Eric Youngdale eric@andante.org to support loadable
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* low-level scsi drivers.
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*
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* Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to
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* provide auto-eject.
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*
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* Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the
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* generic cdrom interface
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*
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* Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()
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* interface, capabilities probe additions, ioctl cleanups, etc.
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*
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* Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs
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*
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* Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM
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* transparently and lose the GHOST hack
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*
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* Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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* check resource allocation in sr_init and some cleanups
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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/string.h>
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#include <linux/errno.h>
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#include <linux/cdrom.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/mutex.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
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#include <scsi/scsi.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_cmnd.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> /* For the door lock/unlock commands */
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#include "scsi_logging.h"
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#include "sr.h"
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MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
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MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
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#define SR_DISKS 256
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#define SR_CAPABILITIES \
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(CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
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CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
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CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \
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CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \
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CDC_MRW|CDC_MRW_W|CDC_RAM)
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static int sr_probe(struct device *);
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static int sr_remove(struct device *);
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static int sr_done(struct scsi_cmnd *);
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static struct scsi_driver sr_template = {
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.owner = THIS_MODULE,
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.gendrv = {
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.name = "sr",
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.probe = sr_probe,
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.remove = sr_remove,
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},
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.done = sr_done,
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};
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static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];
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static DEFINE_SPINLOCK(sr_index_lock);
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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(sr_ref_mutex);
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static int sr_open(struct cdrom_device_info *, int);
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static void sr_release(struct cdrom_device_info *);
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static void get_sectorsize(struct scsi_cd *);
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static void get_capabilities(struct scsi_cd *);
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static int sr_media_change(struct cdrom_device_info *, int);
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static int sr_packet(struct cdrom_device_info *, struct packet_command *);
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static struct cdrom_device_ops sr_dops = {
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.open = sr_open,
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.release = sr_release,
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.drive_status = sr_drive_status,
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.media_changed = sr_media_change,
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.tray_move = sr_tray_move,
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.lock_door = sr_lock_door,
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.select_speed = sr_select_speed,
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.get_last_session = sr_get_last_session,
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.get_mcn = sr_get_mcn,
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.reset = sr_reset,
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.audio_ioctl = sr_audio_ioctl,
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.capability = SR_CAPABILITIES,
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.generic_packet = sr_packet,
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};
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static void sr_kref_release(struct kref *kref);
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static inline struct scsi_cd *scsi_cd(struct gendisk *disk)
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{
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return container_of(disk->private_data, struct scsi_cd, driver);
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}
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/*
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* The get and put routines for the struct scsi_cd. Note this entity
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* has a scsi_device pointer and owns a reference to this.
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*/
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static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
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{
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struct scsi_cd *cd = NULL;
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mutex_lock(&sr_ref_mutex);
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if (disk->private_data == NULL)
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goto out;
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cd = scsi_cd(disk);
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kref_get(&cd->kref);
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if (scsi_device_get(cd->device))
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goto out_put;
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goto out;
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out_put:
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kref_put(&cd->kref, sr_kref_release);
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cd = NULL;
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out:
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mutex_unlock(&sr_ref_mutex);
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return cd;
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}
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static void scsi_cd_put(struct scsi_cd *cd)
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{
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struct scsi_device *sdev = cd->device;
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mutex_lock(&sr_ref_mutex);
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kref_put(&cd->kref, sr_kref_release);
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scsi_device_put(sdev);
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mutex_unlock(&sr_ref_mutex);
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}
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/* identical to scsi_test_unit_ready except that it doesn't
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* eat the NOT_READY returns for removable media */
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int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr)
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{
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int retries = MAX_RETRIES;
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int the_result;
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u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 };
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/* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
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* conditions are gone, or a timeout happens
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*/
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do {
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the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL,
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0, sshdr, SR_TIMEOUT,
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retries--, NULL);
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if (scsi_sense_valid(sshdr) &&
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sshdr->sense_key == UNIT_ATTENTION)
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sdev->changed = 1;
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} while (retries > 0 &&
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(!scsi_status_is_good(the_result) ||
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(scsi_sense_valid(sshdr) &&
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sshdr->sense_key == UNIT_ATTENTION)));
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return the_result;
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}
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/*
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* This function checks to see if the media has been changed in the
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* CDROM drive. It is possible that we have already sensed a change,
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* or the drive may have sensed one and not yet reported it. We must
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* be ready for either case. This function always reports the current
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* value of the changed bit. If flag is 0, then the changed bit is reset.
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* This function could be done as an ioctl, but we would need to have
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* an inode for that to work, and we do not always have one.
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*/
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static int sr_media_change(struct cdrom_device_info *cdi, int slot)
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{
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struct scsi_cd *cd = cdi->handle;
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int retval;
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struct scsi_sense_hdr *sshdr;
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if (CDSL_CURRENT != slot) {
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/* no changer support */
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return -EINVAL;
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}
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sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
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retval = sr_test_unit_ready(cd->device, sshdr);
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if (retval || (scsi_sense_valid(sshdr) &&
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/* 0x3a is medium not present */
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sshdr->asc == 0x3a)) {
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/* Media not present or unable to test, unit probably not
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* ready. This usually means there is no disc in the drive.
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* Mark as changed, and we will figure it out later once
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* the drive is available again.
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*/
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cd->device->changed = 1;
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/* This will force a flush, if called from check_disk_change */
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retval = 1;
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goto out;
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};
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retval = cd->device->changed;
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cd->device->changed = 0;
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/* If the disk changed, the capacity will now be different,
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* so we force a re-read of this information */
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if (retval) {
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/* check multisession offset etc */
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sr_cd_check(cdi);
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get_sectorsize(cd);
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}
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out:
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/* Notify userspace, that media has changed. */
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if (retval != cd->previous_state)
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sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE,
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GFP_KERNEL);
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cd->previous_state = retval;
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kfree(sshdr);
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return retval;
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}
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/*
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* sr_done is the interrupt routine for the device driver.
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*
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* It will be notified on the end of a SCSI read / write, and will take one
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* of several actions based on success or failure.
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*/
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static int sr_done(struct scsi_cmnd *SCpnt)
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{
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int result = SCpnt->result;
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int this_count = scsi_bufflen(SCpnt);
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int good_bytes = (result == 0 ? this_count : 0);
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int block_sectors = 0;
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long error_sector;
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struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk);
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#ifdef DEBUG
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printk("sr.c done: %x\n", result);
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#endif
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/*
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* Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial
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* success. Since this is a relatively rare error condition, no
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* care is taken to avoid unnecessary additional work such as
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* memcpy's that could be avoided.
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*/
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if (driver_byte(result) != 0 && /* An error occurred */
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(SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */
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switch (SCpnt->sense_buffer[2]) {
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case MEDIUM_ERROR:
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case VOLUME_OVERFLOW:
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case ILLEGAL_REQUEST:
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if (!(SCpnt->sense_buffer[0] & 0x90))
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break;
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error_sector = (SCpnt->sense_buffer[3] << 24) |
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(SCpnt->sense_buffer[4] << 16) |
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(SCpnt->sense_buffer[5] << 8) |
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SCpnt->sense_buffer[6];
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if (SCpnt->request->bio != NULL)
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block_sectors =
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bio_sectors(SCpnt->request->bio);
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if (block_sectors < 4)
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block_sectors = 4;
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if (cd->device->sector_size == 2048)
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error_sector <<= 2;
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error_sector &= ~(block_sectors - 1);
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good_bytes = (error_sector -
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blk_rq_pos(SCpnt->request)) << 9;
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if (good_bytes < 0 || good_bytes >= this_count)
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good_bytes = 0;
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/*
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* The SCSI specification allows for the value
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* returned by READ CAPACITY to be up to 75 2K
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* sectors past the last readable block.
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* Therefore, if we hit a medium error within the
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* last 75 2K sectors, we decrease the saved size
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* value.
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*/
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if (error_sector < get_capacity(cd->disk) &&
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cd->capacity - error_sector < 4 * 75)
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set_capacity(cd->disk, error_sector);
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break;
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case RECOVERED_ERROR:
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good_bytes = this_count;
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break;
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default:
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break;
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}
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}
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return good_bytes;
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}
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static int sr_prep_fn(struct request_queue *q, struct request *rq)
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{
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int block = 0, this_count, s_size;
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struct scsi_cd *cd;
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struct scsi_cmnd *SCpnt;
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struct scsi_device *sdp = q->queuedata;
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int ret;
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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);
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if (ret != BLKPREP_OK)
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goto out;
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SCpnt = rq->special;
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cd = scsi_cd(rq->rq_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, printk("Doing sr request, dev = %s, block = %d\n",
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cd->disk->disk_name, block));
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if (!cd->device || !scsi_device_online(cd->device)) {
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SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
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blk_rq_sectors(rq)));
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SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
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goto out;
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}
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if (cd->device->changed) {
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/*
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* quietly refuse to do anything to a changed disc until the
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* changed bit has been reset
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*/
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goto out;
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}
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/*
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* we do lazy blocksize switching (when reading XA sectors,
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* see CDROMREADMODE2 ioctl)
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*/
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s_size = cd->device->sector_size;
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if (s_size > 2048) {
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if (!in_interrupt())
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sr_set_blocklength(cd, 2048);
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else
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printk("sr: can't switch blocksize: in interrupt\n");
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}
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if (s_size != 512 && s_size != 1024 && s_size != 2048) {
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scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);
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goto out;
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}
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if (rq_data_dir(rq) == WRITE) {
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if (!cd->device->writeable)
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goto out;
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SCpnt->cmnd[0] = WRITE_10;
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SCpnt->sc_data_direction = DMA_TO_DEVICE;
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cd->cdi.media_written = 1;
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} else if (rq_data_dir(rq) == READ) {
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SCpnt->cmnd[0] = READ_10;
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SCpnt->sc_data_direction = DMA_FROM_DEVICE;
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} else {
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blk_dump_rq_flags(rq, "Unknown sr command");
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goto out;
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}
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{
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struct scatterlist *sg;
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int i, size = 0, sg_count = scsi_sg_count(SCpnt);
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scsi_for_each_sg(SCpnt, sg, sg_count, i)
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size += sg->length;
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if (size != scsi_bufflen(SCpnt)) {
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scmd_printk(KERN_ERR, SCpnt,
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"mismatch count %d, bytes %d\n",
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size, scsi_bufflen(SCpnt));
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if (scsi_bufflen(SCpnt) > size)
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SCpnt->sdb.length = size;
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}
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}
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/*
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* request doesn't start on hw block boundary, add scatter pads
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*/
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if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
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(scsi_bufflen(SCpnt) % s_size)) {
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scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
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goto out;
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}
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this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
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SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
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cd->cdi.name,
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(rq_data_dir(rq) == WRITE) ?
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"writing" : "reading",
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this_count, blk_rq_sectors(rq)));
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SCpnt->cmnd[1] = 0;
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block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
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|
|
|
if (this_count > 0xffff) {
|
|
this_count = 0xffff;
|
|
SCpnt->sdb.length = this_count * s_size;
|
|
}
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* This indicates that the command is ready from our end to be
|
|
* queued.
|
|
*/
|
|
ret = BLKPREP_OK;
|
|
out:
|
|
return scsi_prep_return(q, rq, ret);
|
|
}
|
|
|
|
static int sr_block_open(struct block_device *bdev, fmode_t mode)
|
|
{
|
|
struct scsi_cd *cd = scsi_cd_get(bdev->bd_disk);
|
|
int ret = -ENXIO;
|
|
|
|
if (cd) {
|
|
ret = cdrom_open(&cd->cdi, bdev, mode);
|
|
if (ret)
|
|
scsi_cd_put(cd);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int sr_block_release(struct gendisk *disk, fmode_t mode)
|
|
{
|
|
struct scsi_cd *cd = scsi_cd(disk);
|
|
cdrom_release(&cd->cdi, mode);
|
|
scsi_cd_put(cd);
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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:
|
|
return scsi_ioctl(sdev, cmd, argp);
|
|
}
|
|
|
|
ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg);
|
|
if (ret != -ENOSYS)
|
|
return ret;
|
|
|
|
/*
|
|
* ENODEV means that we didn't recognise the ioctl, or that we
|
|
* cannot execute it in the current device state. In either
|
|
* case fall through to scsi_ioctl, which will return ENDOEV again
|
|
* if it doesn't recognise the ioctl
|
|
*/
|
|
ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
|
|
(mode & FMODE_NDELAY) != 0);
|
|
if (ret != -ENODEV)
|
|
return ret;
|
|
return scsi_ioctl(sdev, cmd, argp);
|
|
}
|
|
|
|
static int sr_block_media_changed(struct gendisk *disk)
|
|
{
|
|
struct scsi_cd *cd = scsi_cd(disk);
|
|
return cdrom_media_changed(&cd->cdi);
|
|
}
|
|
|
|
static const struct block_device_operations sr_bdops =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.open = sr_block_open,
|
|
.release = sr_block_release,
|
|
.locked_ioctl = sr_block_ioctl,
|
|
.media_changed = sr_block_media_changed,
|
|
/*
|
|
* No compat_ioctl for now because sr_block_ioctl never
|
|
* seems to pass arbitary ioctls down to host drivers.
|
|
*/
|
|
};
|
|
|
|
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)
|
|
{
|
|
struct scsi_cd *cd = cdi->handle;
|
|
|
|
if (cd->device->sector_size > 2048)
|
|
sr_set_blocklength(cd, 2048);
|
|
|
|
}
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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->previous_state = 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);
|
|
blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
|
|
sr_vendor_init(cd);
|
|
|
|
disk->driverfs_dev = &sdev->sdev_gendev;
|
|
set_capacity(disk, cd->capacity);
|
|
disk->private_data = &cd->driver;
|
|
disk->queue = sdev->request_queue;
|
|
cd->cdi.disk = disk;
|
|
|
|
if (register_cdrom(&cd->cdi))
|
|
goto fail_put;
|
|
|
|
dev_set_drvdata(dev, cd);
|
|
disk->flags |= GENHD_FL_REMOVABLE;
|
|
add_disk(disk);
|
|
|
|
sdev_printk(KERN_DEBUG, sdev,
|
|
"Attached scsi CD-ROM %s\n", cd->cdi.name);
|
|
return 0;
|
|
|
|
fail_put:
|
|
put_disk(disk);
|
|
fail_free:
|
|
kfree(cd);
|
|
fail:
|
|
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 + ((buffer[0] << 24) | (buffer[1] << 16) |
|
|
(buffer[2] << 8) | buffer[3]);
|
|
/*
|
|
* 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 = (buffer[4] << 24) |
|
|
(buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
|
|
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;
|
|
/* fall through */
|
|
case 2048:
|
|
cd->capacity *= 4;
|
|
/* fall through */
|
|
case 512:
|
|
break;
|
|
default:
|
|
printk("%s: unsupported sector size %d.\n",
|
|
cd->cdi.name, 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;
|
|
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) {
|
|
printk(KERN_ERR "sr: out of memory.\n");
|
|
return;
|
|
}
|
|
|
|
/* eat unit attentions */
|
|
sr_test_unit_ready(cd->device, &sshdr);
|
|
|
|
/* ask for mode page 0x2a */
|
|
rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,
|
|
SR_TIMEOUT, 3, &data, NULL);
|
|
|
|
if (!scsi_status_is_good(rc)) {
|
|
/* 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);
|
|
printk("%s: scsi-1 drive\n", cd->cdi.name);
|
|
return;
|
|
}
|
|
|
|
n = data.header_length + data.block_descriptor_length;
|
|
cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176;
|
|
cd->readcd_known = 1;
|
|
cd->readcd_cdda = buffer[n + 5] & 0x01;
|
|
/* print some capability bits */
|
|
printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name,
|
|
((buffer[n + 14] << 8) + buffer[n + 15]) / 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->device->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)
|
|
{
|
|
if (cgc->timeout <= 0)
|
|
cgc->timeout = IOCTL_TIMEOUT;
|
|
|
|
sr_do_ioctl(cdi->handle, 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);
|
|
|
|
kfree(cd);
|
|
}
|
|
|
|
static int sr_remove(struct device *dev)
|
|
{
|
|
struct scsi_cd *cd = dev_get_drvdata(dev);
|
|
|
|
blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
|
|
del_gendisk(cd->disk);
|
|
|
|
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");
|