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path: root/drivers/scsi/sr.h
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2011-07-21[SCSI] sr: check_events() ignore GET_EVENT when TUR says otherwiseKay Sievers
Some broken devices indicates that media has changed on every GET_EVENT_STATUS_NOTIFICATION. This translates into MEDIA_CHANGE uevent on every open() which lets udev run into a loop. Verify GET_EVENT result against TUR and if it generates spurious events for several times in a row, ignore the GET_EVENT events, and trust only the TUR status. This is the log of a USB stick with a (broken) fake CDROM drive: scsi 5:0:0:0: Direct-Access SanDisk U3 Cruzer Micro 8.02 PQ: 0 ANSI: 0 CCS sd 5:0:0:0: Attached scsi generic sg3 type 0 scsi 5:0:0:1: CD-ROM SanDisk U3 Cruzer Micro 8.02 PQ: 0 ANSI: 0 sd 5:0:0:0: [sdb] Attached SCSI removable disk sr2: scsi3-mmc drive: 48x/48x tray sr 5:0:0:1: Attached scsi CD-ROM sr2 sr 5:0:0:1: Attached scsi generic sg4 type 5 sr2: GET_EVENT and TUR disagree continuously, suppress GET_EVENT events sd 5:0:0:0: [sdb] 31777279 512-byte logical blocks: (16.2 GB/15.1 GiB) sd 5:0:0:0: [sdb] No Caching mode page present sd 5:0:0:0: [sdb] Assuming drive cache: write through sd 5:0:0:0: [sdb] No Caching mode page present sd 5:0:0:0: [sdb] Assuming drive cache: write through sdb: sdb1 -tj: Updated to consider only spurious GET_EVENT events among different types of disagreement and allow using TUR for kernel event polling after GET_EVENT is ignored. Reported-By: Markus Rathgeb maggu2810@googlemail.com Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: stable@kernel.org # >= v2.6.38, fixes udev busy looping w/ certain devices Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2010-12-16sr: implement sr_check_events()Tejun Heo
Replace sr_media_change() with sr_check_events(). It normally only uses GET_EVENT_STATUS_NOTIFICATION to check both media change and eject request. If @clearing includes DISK_EVENT_MEDIA_CHANGE, it issues TUR and compares whether media presence has changed. The SCSI specific media change uevent is kept for compatibility. sr_media_change() was doing both media change check and revalidation. The revalidation part is split into sr_block_revalidate_disk(). Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-12-16scsi: replace sr_test_unit_ready() with scsi_test_unit_ready()Tejun Heo
The usage of TUR has been confusing involving several different commits updating different parts over time. Currently, the only differences between scsi_test_unit_ready() and sr_test_unit_ready() are, * scsi_test_unit_ready() also sets sdev->changed on NOT_READY. * scsi_test_unit_ready() returns 0 if TUR ended with UNIT_ATTENTION or NOT_READY. Due to the above two differences, sr is using its own sr_test_unit_ready(), but sd - the sole user of the above extra handling - doesn't even need them. Where scsi_test_unit_ready() is used in sd_media_changed(), the code is looking for device ready w/ media present state which is true iff TUR succeeds w/o sense data or UA, and when the device is not ready for whatever reason sd_media_changed() explicitly marks media as missing so there's no reason to set sdev->changed automatically from scsi_test_unit_ready() on NOT_READY. Drop both special handlings from scsi_test_unit_ready(), which makes it equivalant to sr_test_unit_ready(), and replace sr_test_unit_ready() with scsi_test_unit_ready(). Also, drop the unnecessary explicit NOT_READY check from sd_media_changed(). Checking return value is enough for testing device readiness. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2008-02-07[SCSI] sr: fix test unit ready responsesJames Bottomley
Commit 210ba1d1724f5c4ed87a2ab1a21ca861a915f734 updated sr.c to use the scsi_test_unit_ready() function. Unfortunately, this has the wrong characteristic of eating NOT_READY returns which sr.c relies on for tray status. Fix by rolling an internal sr_test_unit_ready() that doesn't do this. Tested-by: Daniel Drake <dsd@gentoo.org> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-01-11[SCSI] sr: update to follow tray status correctlyJames Bottomley
Based on an original patch from: David Martin <tasio@tasio.net> When trying to get the drive status via ioctl CDROM_DRIVE_STATUS, with no disk it gives CDS_TRAY_OPEN even if the tray is closed. ioctl works as expected with ide-cd driver. Gentoo bug report: http://bugs.gentoo.org/show_bug.cgi?id=196879 Cc: Maarten Bressers <mbres@gentoo.org> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-01-11[SCSI] sr,sd: send media state change modification eventsKay Sievers
This will send for a card reader slot (remove/add media): UEVENT[1187091572.155884] change /devices/pci0000:00/0000:00:1d.7/usb5/5-2/5-2:1.0/host7/target7:0:0/7:0:0:0 (scsi) UEVENT[1187091572.162314] remove /block/sdb/sdb1 (block) UEVENT[1187091572.172464] add /block/sdb/sdb1 (block) UEVENT[1187091572.175408] change /devices/pci0000:00/0000:00:1d.7/usb5/5-2/5-2:1.0/host7/target7:0:0/7:0:0:0 (scsi) and for a DVD drive (add/eject media): UEVENT[1187091590.189159] change /devices/pci0000:00/0000:00:1f.1/host4/target4:0:0/4:0:0:0 (scsi) UEVENT[1187091590.957124] add /module/isofs (module) UEVENT[1187091604.468207] change /devices/pci0000:00/0000:00:1f.1/host4/target4:0:0/4:0:0:0 (scsi) Userspace gets events, even for unpartitioned media. This unifies the event handling for asynchronoous events (AN) and events caused by perodical polling the device from userspace. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> [jejb: modified for new event API] Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2006-03-23[PATCH] kill cdrom ->dev_ioctl methodChristoph Hellwig
Since early 2.4.x all cdrom drivers implement the block_device methods themselves, so they can handle additional ioctls directly instead of going through the cdrom layer. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jens Axboe <axboe@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-28[SCSI] sr.c: Fix getting wrong sizePete Zaitcev
Here's the problem. Try to do this on 2.6.12: - Kill udev and HAL - Insert a CD-ROM into a SCSI or USB CD-ROM drive - Run dd if=/dev/scd0 - cat /sys/block/sr0/size - Eject the CD, insert a different one - Run dd if=/dev/scd0 This is likely to do "access beyond the end of device", if you let it - cat /sys/block/sr0/size This shows the size of a previous CD, even though dd was supposed to revalidate the device. - Run dd if=/dev/scd0 The second run of dd works correctly! The bug was introduced in 2.5.31, when Al fixes the recursive opens in partitioning. Before, the code worked like this: - Block layer called cdrom_open directly - cdrom_open called sr_open - sr_open called check_disk_change - check_disk_change called sr_media_change - sr_media_change did cd->needs_disk_change=1 - before returning sr_open tested cd->needs_disk_change and called get_sector_size. In 2.6.12, the check_disk_change is called from cdrom_open only. Thus: - Block layer calls sr_bd_open - sr_bd_open calls cdrom_open - cdrom_open calls sr_open - sr_open tests cd->needs_disk_change, which wasn't set yet; returns - cdrom_open calls check_disk_change - check_disk_change calls sr_media_change - sr_media_change does cd->needs_disk_change=1, but nobody cares Acked by: Alexander Viro <aviro@redhat.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-04-16Linux-2.6.12-rc2Linus Torvalds
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!