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* block: misc updatesTejun Heo2008-10-093-7/+8
| | | | | | | | | | | | | | | | | This patch makes the following misc updates in preparation for disk->part dereference fix and extended block devt support. * implment part_to_disk() * fix comment about gendisk->part indexing * rename get_part() to disk_map_sector() * don't use n which is always zero while printing disk information in diskstats_show() Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: update add_partition() error handlingTejun Heo2008-10-091-5/+2
| | | | | | | | | | | | | | | | | | | | | | | | d805dda4 tried to fix error case handling in add_partition() but had a few problems. * disk->part[] entry is set early and left dangling if operation fails. * Once device initialized, the last put_device() is responsible for freeing all the resources. The failure path freed part_stats and p regardless of put_device() causing double free. * holders subdir holds reference to the disk device, so failure path should remove it to release resources properly which was missing. This patch fixes the above problems and while at it move partition slot busy check into add_partition() for completeness and inlines holders subdirectory creation. Using separate function for it just obfuscates the code. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Abdel Benamrouche <draconux@gmail.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: allow deleting zero length partitionTejun Heo2008-10-091-2/+0
| | | | | | | | | | | | | | delete_partition() was noop for zero length partition. As the addition code allows creating zero lenght partition and deletion is assumed to always succeed, this causes memory leak for zero length partitions. Allow zero length partitions to end their meaningless lives. While at it, allow deleting zero lenght partition via BLKPG_DEL_PARTITION ioctl too. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: use class_dev_iterator instead of class_for_each_device()Tejun Heo2008-10-091-155/+97
| | | | | | | | | | | | | | | | | | | Recent block_class iteration updates 5c6f35c5..27f3025 converted all class device iteration to class_for_each_device() and class_find_device(), which are correct but pain in the ass to use. This pach converts them to newly introduced class_dev_iterator so that they can use more natural control structures instead of separate callbacks and struct to pass parameters to them. This results in smaller and easier code. This patch also restores the original behavior of not printing header in /proc/partitions if there's no partition to print. This is trivial but still user-visible behavior. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: don't grab block_class_lock unnecessarilyTejun Heo2008-10-091-19/+9
| | | | | | | | | block_class_lock protects major_names array and bdev_map and doesn't have anything to do with block class devices. Don't grab them while iterating over block class devices. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: fix partition info printoutsTejun Heo2008-10-091-5/+5
| | | | | | | | | | | | | | | | | | | | | Recent block_class iteration updates 5c6f35c5..27f3025 broke partition info printouts. * printk_all_partitions(): Partition print out stops when it meets a partition hole. Partition printing inner loop should continue instead of exiting on empty partition slot. * /proc/partitions and /proc/diskstats: If all information can't be read in single read(), the information is truncated. This is because find_start() doesn't actually update the counter containing the initial seek. It runs to the end and ends up always reporting EOF on the second read. This patch fixes both problems. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Add some block/ source files to the kernel-api docbook. Fix kernel-doc ↵Randy Dunlap2008-10-097-59/+60
| | | | | | | notation in them as needed. Fix changed function parameter names. Fix typos/spellos. In comments, change REQ_SPECIAL to REQ_TYPE_SPECIAL and REQ_BLOCK_PC to REQ_TYPE_BLOCK_PC. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* drop vmerge accountingMikulas Patocka2008-10-093-30/+4
| | | | | | | | Remove hw_segments field from struct bio and struct request. Without virtual merge accounting they have no purpose. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: drop virtual merging accountingMikulas Patocka2008-10-091-73/+6
| | | | | | | Remove virtual merge accounting. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* deadline-iosched: non-functional fixesAaron Carroll2008-10-091-13/+13
| | | | | | | | | | | * convert goto to simpler while loop; * use rq_end_sector() instead of computing manually; * fix false comments; * remove spurious whitespace; * convert rq_rb_root macro to an inline function. Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* deadline-iosched: allow non-sequential batchingAaron Carroll2008-10-091-11/+3
| | | | | | | | | | | Deadline currently only batches sector-contiguous requests, so except for a few circumstances (e.g. requests in a single direction), it is essentially first come first served. This is bad for throughput, so change it to CSCAN, which means requests in a batch do not need to be sequential and are issued in increasing sector order. Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Allow elevators to sort/merge discard requestsDavid Woodhouse2008-10-095-19/+36
| | | | | | | | | | | | | But blkdev_issue_discard() still emits requests which are interpreted as soft barriers, because naïve callers might otherwise issue subsequent writes to those same sectors, which might cross on the queue (if they're reallocated quickly enough). Callers still _can_ issue non-barrier discard requests, but they have to take care of queue ordering for themselves. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Add BLKDISCARD ioctl to allow userspace to discard sectorsDavid Woodhouse2008-10-092-0/+77
| | | | | | | | | | | | We may well want mkfs tools to use this to mark the whole device as unwanted before they format it, for example. The ioctl takes a pair of uint64_ts, which are start offset and length in _bytes_. Although at the moment it might make sense for them both to be in 512-byte sectors, I don't want to limit the ABI to that. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Use WRITE_BARRIER in blkdev_issue_flush(), not (1<<BIO_RW_BARRIER)OGAWA Hirofumi2008-10-091-1/+1
| | | | | | | | Barriers should be submitted with the WRITE flag set. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* blktrace: simplify flags handling in __blk_add_traceDavid Woodhouse2008-10-091-30/+8
| | | | | | | | | Let the compiler see what's going on, and it can all get a lot simpler. On PPC64 this reduces the size of the code calculating these bits by about 60%. On x86_64 it's less of a win -- only 40%. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* blktrace: support discard requestsDavid Woodhouse2008-10-091-1/+10
| | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Add 'discard' request handlingDavid Woodhouse2008-10-093-8/+106
| | | | | | | | | | | | | | | | | | | | Some block devices benefit from a hint that they can forget the contents of certain sectors. Add basic support for this to the block core, along with a 'blkdev_issue_discard()' helper function which issues such requests. The caller doesn't get to provide an end_io functio, since blkdev_issue_discard() will automatically split the request up into multiple bios if appropriate. Neither does the function wait for completion -- it's expected that callers won't care about when, or even _if_, the request completes. It's only a hint to the device anyway. By definition, the file system doesn't _care_ about these sectors any more. [With feedback from OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> and Jens Axboe <jens.axboe@oracle.com] Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Fix up comments about matching flags between bio and rqDavid Woodhouse2008-10-091-5/+2
| | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: use bio_has_data() in the IO completion pathJens Axboe2008-10-091-5/+4
| | | | Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: use bio_has_data() to check for data carrying bioJens Axboe2008-10-091-4/+1
| | | | Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* SG_IO block filter whitelist missing MMC SET READ AHEAD commandxiphmont@xiph.org2008-10-091-0/+1
| | | | | | | | | | | | | | | | | | | | | I have another request for the block filter SG_IO command whitelist, specifically the MMC streaming command set SET READ AHEAD command. The command applies only to MMC CDROM/DVDROM drives with the streaming optional feature set. The command is useful to cdparanoia in that it allows explicit cache control side effects that are, on many drives, cdparanoia's most efficient way to flush/disable the media cache on cdrom drives. I am aware of no reason why it should not be accessible from usespace. Also note that the command is already fully accessible through the SCSI-native version of the SG_IO ioctl as well as the traditional SG interface. The command is only being refused on block devices. That means that on a typical stock distro, the command is available through /dev/sg* but not /dev/scd* although both are typically available and accessible. Filtering the command is not providing any protection, only a confusing inconsistency. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: disable sysfs parts of the disk command filterJens Axboe2008-09-111-0/+2
| | | | | | | | We still have life time issues with the sysfs command filter kobject, so disable it for 2.6.27 release. We can revisit this and make it work properly for 2.6.28, for 2.6.27 release it's too risky. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: restore original behavior of /proc/partition when there's no partitionTejun Heo2008-09-011-1/+12
| | | | | | | | | | | | | | | /proc/partitions didn't use to write out the header if there was no partition. However, recent commit 66c64afe changed the behavior. This is nothing major but there's no reason to change user visible behavior without a good rationale. Restore the original behavior. Note that 2.6.28 has clean up changes scheduled which will replace this rather hacky implementation. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Greg KH <greg@kroah.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* remove blk_register_filter and blk_unregister_filter in gendiskFUJITA Tomonori2008-08-292-3/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch remove blk_register_filter and blk_unregister_filter in gendisk, and adds them to sd.c, sr.c. and ide-cd.c The commit abf5439370491dd6fbb4fe1a7939680d2a9bc9d4 moved cmdfilter from gendisk to request_queue. It turned out that in some subsystems multiple gendisks share a single request_queue. So we get: Using physmap partition information Creating 3 MTD partitions on "physmap-flash": 0x00000000-0x01c00000 : "User FS" 0x01c00000-0x01c40000 : "booter" kobject (8511c410): tried to init an initialized object, something is seriously wrong. Call Trace: [<8036644c>] dump_stack+0x8/0x34 [<8021f050>] kobject_init+0x50/0xcc [<8021fa18>] kobject_init_and_add+0x24/0x58 [<8021d20c>] blk_register_filter+0x4c/0x64 [<8021c194>] add_disk+0x78/0xe0 [<8027d14c>] add_mtd_blktrans_dev+0x254/0x278 [<8027c8f0>] blktrans_notify_add+0x40/0x78 [<80279c00>] add_mtd_device+0xd0/0x150 [<8027b090>] add_mtd_partitions+0x568/0x5d8 [<80285458>] physmap_flash_probe+0x2ac/0x334 [<802644f8>] driver_probe_device+0x12c/0x244 [<8026465c>] __driver_attach+0x4c/0x84 [<80263c64>] bus_for_each_dev+0x58/0xac [<802633ec>] bus_add_driver+0xc4/0x24c [<802648e0>] driver_register+0xcc/0x184 [<80100460>] _stext+0x60/0x1bc In the long term, we need to fix such subsystems but we need a quick fix now. This patch add the command filter support to only sd and sr though it might be useful for other SG_IO users (such as cciss). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Reported-by: Manuel Lauss <mano@roarinelk.homelinux.net> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: remove unused ->busy part of the block queue tag mapMatthew Wilcox2008-08-271-4/+2
| | | | | | | It's not used for anything. On top of that, it's racy and can thus trigger a faulty BUG_ON() in __blk_free_tags() on queue exit. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: clean up cmdfilter sysfs interfaceAdel Gadllah2008-08-271-24/+30
| | | | | | | | | | | | | | | | | | | | | | | This patch changes the interface of the cmd filter to use a +/- notation like: echo -- +0x02 +0x03 -0x08 If neither + or - is given it defaults to + (allow command). Note: The interface was added in 2.6.17-rc1 and is unused and undocumented so far so it's safe to change it. Reviewed-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: jens.axboe@oracle.com Cc: James.Bottomley@hansenpartnership.com Cc: dan.j.williams@intel.com Cc: pjones@redhat.com Cc: viro@zeniv.linux.org.uk Cc: dougg@torque.net Signed-off-by: Adel Gadllah <adel.gadllah@gmail.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: rename blk_scsi_cmd_filter to blk_cmd_filterFUJITA Tomonori2008-08-272-16/+16
| | | | | | | | | Technically, the cmd_filter would be applied to other protocols though it's unlikely to happen. Putting SCSI stuff to request_queue is kinda layer violation. So let's rename it. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: move cmdfilter from gendisk to request_queueFUJITA Tomonori2008-08-274-148/+110
| | | | | | | | | | | | | | | | | | | | | | | | | | cmd_filter works only for the block layer SG_IO with SCSI block devices. It breaks scsi/sg.c, bsg, and the block layer SG_IO with SCSI character devices (such as st). We hit a kernel crash with them. The problem is that cmd_filter code accesses to gendisk (having struct blk_scsi_cmd_filter) via inode->i_bdev->bd_disk. It works for only SCSI block device files. With character device files, inode->i_bdev leads you to struct cdev. inode->i_bdev->bd_disk->blk_scsi_cmd_filter isn't safe. SCSI ULDs don't expose gendisk; they keep it private. bsg needs to be independent on any protocols. We shouldn't change ULDs to expose their gendisk. This patch moves struct blk_scsi_cmd_filter from gendisk to request_queue, a common object, which eveyone can access to. The user interface doesn't change; users can change the filters via /sys/block/. gendisk has a pointer to request_queue so the cmd_filter code accesses to struct blk_scsi_cmd_filter. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* block: drop references taken by class_find_device()Kay Sievers2008-08-211-6/+16
| | | | | | | | | Otherwise we leak references, which is not a good thing to do. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* block: fix partial read() of /proc/{partitions,diskstats}Kay Sievers2008-08-211-6/+8
| | | | | | | | | | | The proc files get truncated if they do not fit into the buffer with a single read(). We need to move the seq_file index from the callback of class_find_device() to the caller of class_find_device(), to keep its value across multiple invocations of the callback. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6Linus Torvalds2008-08-041-1/+1
|\ | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6: [SCSI] scsi_transport_spi: fix oops in revalidate [SCSI] ses: fix VPD inquiry overrun [SCSI] block: Fix miscalculation of sg_io timeout in CDROM_SEND_PACKET handler. [SCSI] hptiop: add more PCI device IDs
| * [SCSI] block: Fix miscalculation of sg_io timeout in CDROM_SEND_PACKET handler.Tim Wright2008-07-301-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It seems cdrwtool in the udftools has been unusable on "modern" kernels for some time. A Google search reveals many people with the same issue but no solution (cdrwtool fails to format the disk). After spending some time tracking down the issue, it comes down to the following: The udftools still use the older CDROM_SEND_PACKET interface to send things like FORMAT_UNIT through to the drive. They should really be updated, but that's another story. Since most distros are using libata now, the cd or dvd burner appears as a SCSI device, and we wind up in block/scsi_ioctl.c. Here, the code tries to take the "struct cdrom_generic_command" and translate it and stuff it into a "struct sg_io_hdr" structure so it can pass it to the modern sg_io() routine instead. Unfortunately, there is one error, or rather an omission in the translation. The timeout that is passed in in the "struct cdrom_generic_command" is in HZ=100 units, and this is modified and correctly converted to jiffies by use of clock_t_to_jiffies(). However, a little further down, this cgc.timeout value in jiffies is simply copied into the sg_io_hdr timeout, which should be in milliseconds. Since most modern x86 kernels seems to be getting build with HZ=250, the timeout that is passed to sg_io and eventually converted to the timeout_per_command member of the scsi_cmnd structure is now four times too small. Since cdrwtool tries to set the timeout to one hour for the FORMAT_UNIT command, and it takes about 20 minutes to format a 4x CDRW, the SCSI error-handler kicks in after the FORMAT_UNIT completes because it took longer than the incorrectly-calculated timeout. [jejb: fix up whitespace] Signed-off-by: Tim Wright <timw@splhi.com> Cc: Stable Tree <stable@kernel.org> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* | block: add a blk_plug_device_unlocked() that grabs the queue lockJens Axboe2008-08-011-0/+18
|/ | | | | | | | blk_plug_device() must be called with the queue lock held, so callers often just grab and release the lock for that purpose. Add a helper that does just that. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Use WARN() in block/Arjan van de Ven2008-07-261-2/+1
| | | | | | | | | | Use WARN() instead of a printk+WARN_ON() pair; this way the message becomes part of the warning section for better reporting/collection. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* block/blk-map.c: use the new object_is_on_stack() helperFUJITA Tomonori2008-07-261-6/+2
| | | | | | | | | | | Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Tejun Heo <htejun@gmail.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* block/ioctl.c and fs/partition/check.c: check value returned by add_partition()Abdel Benamrouche2008-07-251-2/+3
| | | | | | | | | | Now that add_partition() has been aught to propagate errors, let's check them. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Abdel Benamrouche <draconux@gmail.com> Cc: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* block: make /proc/partitions and /proc/diskstats use class_find_device()Greg Kroah-Hartman2008-07-211-12/+13
| | | | | | | | Use the proper class iterator function instead of mucking around in the internals of the class structures. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* block: move header for /proc/partitions to seq_startGreg Kroah-Hartman2008-07-211-3/+4
| | | | | | | | | The seq_start call is the better place for the header for the file, that way we don't have to be mucking in the class structure to try to figure out if this is the first partition or not. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* block: make proc files seq_start use the class_find_device()Greg Kroah-Hartman2008-07-211-14/+17
| | | | | | | | Use the proper class iterator function instead of mucking around in the internals of the class structures. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* block: make /proc/diskstats only build if CONFIG_PROC_FS is enabledRandy Dunlap2008-07-211-0/+2
| | | | | | | | | | | These functions are only needed if CONFIG_PROC_FS is enabled, so save the space when it is not. This also makes it easier for a patch later in this series to work properly if CONFIG_PROC_FS is not enabled. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* block: make blk_lookup_devt use the class iterator functionGreg Kroah-Hartman2008-07-211-12/+26
| | | | | | | | Use the proper class iterator function instead of mucking around in the internals of the class structures. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* block: make printk_partition use the class iterator functionGreg Kroah-Hartman2008-07-211-43/+50
| | | | | | | | Use the proper class iterator function instead of mucking around in the internals of the class structures. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* block: fix compiler warning in genhd.cGreg Kroah-Hartman2008-07-211-1/+3
| | | | | | | Warn if something really bad happens if we can't create this link. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* device create: block: convert device_create to device_create_drvdataGreg Kroah-Hartman2008-07-211-1/+2
| | | | | | | | device_create() is race-prone, so use the race-free device_create_drvdata() instead as device_create() is going away. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* sysfs: add /sys/dev/{char,block} to lookup sysfs path by major:minorDan Williams2008-07-211-1/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Why?: There are occasions where userspace would like to access sysfs attributes for a device but it may not know how sysfs has named the device or the path. For example what is the sysfs path for /dev/disk/by-id/ata-ST3160827AS_5MT004CK? With this change a call to stat(2) returns the major:minor then userspace can see that /sys/dev/block/8:32 links to /sys/block/sdc. What are the alternatives?: 1/ Add an ioctl to return the path: Doable, but sysfs is meant to reduce the need to proliferate ioctl interfaces into the kernel, so this seems counter productive. 2/ Use udev to create these symlinks: Also doable, but it adds a udev dependency to utilities that might be running in a limited environment like an initramfs. 3/ Do a full-tree search of sysfs. [kay.sievers@vrfy.org: fix duplicate registrations] [kay.sievers@vrfy.org: cleanup suggestions] Cc: Neil Brown <neilb@suse.de> Cc: Tejun Heo <htejun@gmail.com> Acked-by: Kay Sievers <kay.sievers@vrfy.org> Reviewed-by: SL Baur <steve@xemacs.org> Acked-by: Kay Sievers <kay.sievers@vrfy.org> Acked-by: Mark Lord <lkml@rtr.ca> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6Linus Torvalds2008-07-151-3/+6
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (102 commits) [SCSI] scsi_dh: fix kconfig related build errors [SCSI] sym53c8xx: Fix bogus sym_que_entry re-implementation of container_of [SCSI] scsi_cmnd.h: remove double inclusion of linux/blkdev.h [SCSI] make struct scsi_{host,target}_type static [SCSI] fix locking in host use of blk_plug_device() [SCSI] zfcp: Cleanup external header file [SCSI] zfcp: Cleanup code in zfcp_erp.c [SCSI] zfcp: zfcp_fsf cleanup. [SCSI] zfcp: consolidate sysfs things into one file. [SCSI] zfcp: Cleanup of code in zfcp_aux.c [SCSI] zfcp: Cleanup of code in zfcp_scsi.c [SCSI] zfcp: Move status accessors from zfcp to SCSI include file. [SCSI] zfcp: Small QDIO cleanups [SCSI] zfcp: Adapter reopen for large number of unsolicited status [SCSI] zfcp: Fix error checking for ELS ADISC requests [SCSI] zfcp: wait until adapter is finished with ERP during auto-port [SCSI] ibmvfc: IBM Power Virtual Fibre Channel Adapter Client Driver [SCSI] sg: Add target reset support [SCSI] lib: Add support for the T10 (SCSI) Data Integrity Field CRC [SCSI] sd: Move scsi_disk() accessor function to sd.h ...
| * [SCSI] bsg: fix bsg_mutex hang with device removalFUJITA Tomonori2008-07-121-3/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We don't need to hold bsg_mutex during bsg_complete_all_commands(). It leads to a problem that we block bsg_unregister_queue during bsg_complete_all_commands (untill all the outstanding commands complete). Thanks to Pete Wyckoff for finding the bug and testing the patch. The detailed bug report is: http://marc.info/?l=linux-scsi&m=121182137132145&w=2 Tested-by: Pete Wyckoff <pw@osc.edu> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6Linus Torvalds2008-07-152-11/+7
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6: (80 commits) ide-floppy: fix unfortunate function naming ide-tape: unify idetape_create_read/write_cmd ide: add ide_pc_intr() helper ide-{floppy,scsi}: read Status Register before stopping DMA engine ide-scsi: add more debugging to idescsi_pc_intr() ide-scsi: use pc->callback ide-floppy: add more debugging to idefloppy_pc_intr() ide-tape: always log debug info in idetape_pc_intr() if debugging is enabled ide-tape: add ide_tape_io_buffers() helper ide-tape: factor out DSC handling from idetape_pc_intr() ide-{floppy,tape}: move checking of ->failed_pc to ->callback ide: add ide_issue_pc() helper ide: add PC_FLAG_DRQ_INTERRUPT pc flag ide-scsi: move idescsi_map_sg() call out from idescsi_issue_pc() ide: add ide_transfer_pc() helper ide-scsi: set drive->scsi flag for devices handled by the driver ide-{cd,floppy,tape}: remove checking for drive->scsi ide: add PC_FLAG_ZIP_DRIVE pc flag ide-tape: factor out waiting for good ireason from idetape_transfer_pc() ide-tape: set PC_FLAG_DMA_IN_PROGRESS flag in idetape_transfer_pc() ...
| * | block: unexport blk_end_sync_rqFUJITA Tomonori2008-07-151-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All the users of blk_end_sync_rq has gone (they are converted to use blk_execute_rq). This unexports blk_end_sync_rq. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Borislav Petkov <petkovbb@gmail.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
| * | block: remove the checking for NULL queue in blk_put_requestFUJITA Tomonori2008-07-151-9/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some uses blk_put_request asymmetrically, that is, they uses it with requests that not allocated by blk_get_request. As a result, blk_put_request has a hack to catch a NULL request_queue. Now such callers are fixed (they use blk_get_request properly). So we can safely remove the hack in blk_put_request. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Borislav Petkov <petkovbb@gmail.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
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