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* [PATCH] cfq-iosched: fix crash in do_div()Jens Axboe2006-06-14
| | | | | | | | | | | | | We don't clear the seek stat values in cfq_alloc_io_context(), and if ->seek_mean is unlucky enough to be set to -36 by chance, the first invocation of cfq_update_io_seektime() will oops with a divide by zero in do_div(). Just memset the entire cic instead of filling invididual values independently. Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] elevator switching raceJens Axboe2006-06-08
| | | | | | | | | | | | | | | | | | | | There's a race between shutting down one io scheduler and firing up the next, in which a new io could enter and cause the io scheduler to be invoked with bad or NULL data. To fix this, we need to maintain the queue lock for a bit longer. Unfortunately we cannot do that, since the elevator init requires to be run without the lock held. This isn't easily fixable, without also changing the mempool API. So split the initialization into two parts, and alloc-init operation and an attach operation. Then we can preallocate the io scheduler and related structures, and run the attach inside the lock after we detach the old one. This patch has survived 30 minutes of 1 second io scheduler switching with a very busy io load. Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] cfq-iosched: busy_rr fairness fixJens Axboe2006-06-01
| | | | | | | Now that we select busy_rr for possible service, insert entries at the back of that list instead of at the front. Signed-off-by: Jens Axboe <axboe@suse.de>
* [PATCH] cfq-iosched: fix bug in timer handling for the idle classJens Axboe2006-06-01
| | | | | | | | | There's a small window from when the timer is entered and we grab the queue lock, where cfq_set_active_queue() could be rearming the timer for us. Seen in the wild on a 12-way ppc box. Fix this by just using mod_timer(), which will do the right thing for us. Signed-off-by: Jens Axboe <axboe@suse.de>
* [PATCH] cfq-iosched: Detect hardware queueingJens Axboe2006-06-01
| | | | | | | | If the hardware is doing real queueing, decide that it's worthless to idle the hardware. It does reasonable simultaneous io in that case anyways, and the idling hurts some work loads. Signed-off-by: Jens Axboe <axboe@suse.de>
* [PATCH] cfq-iosched: Detect idle process issuing async requestJens Axboe2006-06-01
| | | | | | | | If we are anticipating a sync request from this process and we are waiting for that and see an async request come in, expire that slice and move on. Signed-off-by: Jens Axboe <axboe@suse.de>
* [PATCH] cfq-iosched: check busy queues before deciding we are idleJens Axboe2006-06-01
| | | | | | | | For just one busy queue (like async write out), we often overlooked that we could queue more io and decided we were idle instead. This causes us quite a bit of performance loss. Signed-off-by: Jens Axboe <axboe@suse.de>
* [PATCH] cfq-iosched: fixup locking and ->queue_list list managementJens Axboe2006-05-30
| | | | | | | | - Drop cic from the list when seen as dead. - Fixup the locking, just use a simple spinlock. Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] blk: fix gendisk->in_flight accounting during barrier sequenceJens Axboe2006-05-23
| | | | | | | | | | | | | | While executing barrrier sequence, the bar_rq which carries actual write was accounted as normal IO on completion, while it wasn't on queueing. This caused gendisk->in_flight to be decremented by 1 after each barrier thus messed up statistics. This patch makes bar_rq not accounted as normal IO. As the containing barrier request as a whole is accounted, part of it shouldn't be. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Revert "[BLOCK] Fix oops on removal of SD/MMC card"Linus Torvalds2006-05-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This reverts commit 56cf6504fc1c0c221b82cebc16a444b684140fb7. Both Erik Mouw and Andrew Vasquez independently pinpointed this commit as causing problems, where the slab cache for a driver is never released (most obviously causing problems when immediately re-loading that driver, resulting in a "kmem_cache_create: duplicate cache <xyz>" message, but it can also cause other trouble). James Bottomley dug into it, and reports: "OK, here's the scoop. The problem patch adds a get of driverfs_dev in add_disk(), but doesn't put it again until disk_release() (which occurs on final put_disk() of the gendisk). However, in SCSI, the driverfs_dev is the sdev_gendev. That means there's a reference held on sdev_gendev until final disk put. Unfortunately, we use the driver model driver_remove to trigger del_gendisk (which removes the gendisk from visibility and decrements the refcount), so we've introduced an unbreakable deadlock in the reference counting with this. I suggest simply reversing this patch at the moment. If Russell and Jens can tell me what they're trying to do I'll see if there's another way to do it." so hereby the patch gets reverted, waiting for a better fix. Cc: Jens Axboe <axboe@suse.de> Cc: Russell King <rmk@arm.linux.org.uk> Cc: James Bottomley <James.Bottomley@SteelEye.com> Cc: Erik Mouw <erik@harddisk-recovery.com> Cc: Andrew Vasquez <andrew.vasquez@qlogic.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [BLOCK] limit request_fn recursionJens Axboe2006-05-11
| | | | | | | | | | | | | | | | | Don't recurse back into the driver even if the unplug threshold is met, when the driver asks for a requeue. This is both silly from a logical point of view (requeues typically happen due to driver/hardware shortage), and also dangerous since we could hit an endless request_fn -> requeue -> unplug -> request_fn loop and crash on stack overrun. Also limit blk_run_queue() to one level of recursion, similar to how blk_start_queue() works. This patch fixed a real problem with SLES10 and lpfc, and it could hit any SCSI lld that returns non-zero from it's ->queuecommand() handler. Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [BLOCK] Fix oops on removal of SD/MMC cardRussell King2006-05-05
| | | | | | | | | | | | | | | | | | | | | The block layer keeps a reference (driverfs_dev) to the struct device associated with the block device, and uses it internally for generating uevents in block_uevent. Block device uevents include umounting the partition, which can occur after the backing device has been removed. Unfortunately, this reference is not counted. This means that if the struct device is removed from the device tree, the block layers reference will become stale. Guard against this by holding a reference to the struct device in add_disk(), and only drop the reference when we're releasing the gendisk kobject - in other words when we can be sure that no further uevents will be generated for this block device. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Jens Axboe <axboe@suse.de>
* [PATCH] Remove __devinitdata from notifier block definitionsChandra Seetharaman2006-04-26
| | | | | | | | | | | | | | | | Few of the notifier_chain_register() callers use __devinitdata in the definition of notifier_block data structure. It is incorrect as the data structure should be available after the initializations (they do not unregister them during initializations). This was leading to an oops when notifier_chain_register() call is invoked for those callback chains after initialization. This patch fixes all such usages to _not_ have the notifier_block data structure in the init data section. Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] block/elevator.c: remove unused exportsAdrian Bunk2006-04-20
| | | | | | | | | | | This patch removes the following unused EXPORT_SYMBOL's: - elv_requeue_request - elv_completed_request They are only used by the block core, hence they need not be exported. Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Jens Axboe <axboe@suse.de>
* [patch] cleanup: use blk_queue_stoppedCoywolf Qi Hunt2006-04-20
| | | | | | | This cleanup the source to use blk_queue_stopped. Signed-off-by: Coywolf Qi Hunt <qiyong@freeforge.net> Signed-off-by: Jens Axboe <axboe@suse.de>
* [PATCH] cfq: Further rbtree traversal and cfq_exit_queue() race fixOGAWA Hirofumi2006-04-18
| | | | | | | | | | | | In current code, we are re-reading cic->key after dead cic->key check. So, in theory, it may really re-read *after* cfq_exit_queue() seted NULL. To avoid race, we copy it to stack, then use it. With this change, I guess gcc will assign cic->key to a register or stack, and it wouldn't be re-readed. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Jens Axboe <axboe@suse.de>
* [PATCH 2/2] cfq: fix cic's rbtree traversalOGAWA Hirofumi2006-04-18
| | | | | | | | | When queue dies, we set cic->key=NULL as dead mark. So, when we traverse a rbtree, we must check whether it's still valid key. if it was invalidated, drop it, then restart the traversal from top. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Jens Axboe <axboe@suse.de>
* [PATCH 1/2] iosched: fix typo and barrier()OGAWA Hirofumi2006-04-18
| | | | | | | | | | | | | | | | | | | | | | On rmmod path, cfq/as waits to make sure all io-contexts was freed. However, it's using complete(), not wait_for_completion(). I think barrier() is not enough in here. To avoid the following case, this patch replaces barrier() with smb_wmb(). cpu0 visibility cpu1 [ioc_gnone=NULL,ioc_count=1] ioc_gnone = &all_gone NULL,ioc_count=1 atomic_read(&ioc_count) NULL,ioc_count=1 wait_for_completion() NULL,ioc_count=0 atomic_sub_and_test() NULL,ioc_count=0 if ( && ioc_gone) [ioc_gone==NULL, so doesn't call complete()] &all_gone,ioc_count=0 Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Jens Axboe <axboe@suse.de>
* [SCSI] unify SCSI_IOCTL_SEND_COMMAND implementationsChristoph Hellwig2006-04-13
| | | | | | | | | | | | | | | | | | | | | | We currently have two implementations of this obsolete ioctl, one in the block layer and one in the scsi code. Both of them have drawbacks. This patch kills the scsi layer version after updating the block version with the missing bits: - argument checking - use scatterlist I/O - set number of retries based on the submitted command This is the last user of non-S/G I/O except for the gdth driver, so getting this in ASAP and through the scsi tree would be nie to kill the non-S/G I/O path. Jens, what do you think about adding a check for non-S/G I/O in the midlayer? Thanks to Or Gerlitz for testing this patch. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
* Documentation: fix minor kernel-doc warningsMartin Waitz2006-04-02
| | | | | | | This patch updates the comments to match the actual code. Signed-off-by: Martin Waitz <tali@admingilde.org> Signed-off-by: Adrian Bunk <bunk@stusta.de>
* [PATCH] config: fix CONFIG_LFS optionTrond Myklebust2006-03-31
| | | | | | | | | | | | | | | The help text says that if you select CONFIG_LBD, then it will automatically select CONFIG_LFS. That isn't currently the case, so update the text. - Get rid of the cruft in the help text mentioning CONFIG_LBD - Tell unsure users to select CONFIG_LFS. - Remove the `default n'. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Don't pass boot parameters to argv_init[]OGAWA Hirofumi2006-03-31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | The boot cmdline is parsed in parse_early_param() and parse_args(,unknown_bootoption). And __setup() is used in obsolete_checksetup(). start_kernel() -> parse_args() -> unknown_bootoption() -> obsolete_checksetup() If __setup()'s callback (->setup_func()) returns 1 in obsolete_checksetup(), obsolete_checksetup() thinks a parameter was handled. If ->setup_func() returns 0, obsolete_checksetup() tries other ->setup_func(). If all ->setup_func() that matched a parameter returns 0, a parameter is seted to argv_init[]. Then, when runing /sbin/init or init=app, argv_init[] is passed to the app. If the app doesn't ignore those arguments, it will warning and exit. This patch fixes a wrong usage of it, however fixes obvious one only. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Simplify proc/devices and fix early termination regressionJoe Korty2006-03-31
| | | | | | | | | | | | | | | | | | | | | | | Make baby-simple the code for /proc/devices. Based on the proven design for /proc/interrupts. This also fixes the early-termination regression 2.6.16 introduced, as demonstrated by: # dd if=/proc/devices bs=1 Character devices: 1 mem 27+0 records in 27+0 records out This should also work (but is untested) when /proc/devices >4096 bytes, which I believe is what the original 2.6.16 rewrite fixed. [akpm@osdl.org: cleanups, simplifications] Signed-off-by: Joe Korty <joe.korty@ccur.com> Cc: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Merge branch 'cfq-merge' of git://brick.kernel.dk/data/git/linux-2.6-blockLinus Torvalds2006-03-28
|\ | | | | | | | | | | | | | | * 'cfq-merge' of git://brick.kernel.dk/data/git/linux-2.6-block: [BLOCK] cfq-iosched: seek and async performance fixes [PATCH] ll_rw_blk: fix 80-col offender in put_io_context() [PATCH] cfq-iosched: small cfq_choose_req() optimization [PATCH] [BLOCK] cfq-iosched: change cfq io context linking from list to tree
| * [BLOCK] cfq-iosched: seek and async performance fixesJens Axboe2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Detect whether a given process is seeky and if so disable (mostly) the idle window if it is. We still allow just a little idle time, just enough to allow that process to submit a new request. That is needed to maintain fairness across priority groups. In some cases, we could setup several async queues. This is not optimal from a performance POV, since we want all async io in one queue to perform good sorting on it. It also impacted sync queues, as async io got too much slice time. Signed-off-by: Jens Axboe <axboe@suse.de>
| * [PATCH] ll_rw_blk: fix 80-col offender in put_io_context()Jens Axboe2006-03-28
| | | | | | | | | | | | This makes akpm more happy. Signed-off-by: Jens Axboe <axboe@suse.de>
| * [PATCH] cfq-iosched: small cfq_choose_req() optimizationAndreas Mohr2006-03-28
| | | | | | | | | | | | | | | | | | | | | | | | this is a small optimization to cfq_choose_req() in the CFQ I/O scheduler (this function is a semi-often invoked candidate in an oprofile log): by using a bit mask variable, we can use a simple switch() to check the various cases instead of having to query two variables for each check. Benefit: 251 vs. 285 bytes footprint of cfq_choose_req(). Also, common case 0 (no request wrapping) is now checked first in code. Signed-off-by: Andreas Mohr <andi@lisas.de> Signed-off-by: Jens Axboe <axboe@suse.de>
| * [PATCH] [BLOCK] cfq-iosched: change cfq io context linking from list to treeJens Axboe2006-03-28
| | | | | | | | | | | | | | | | | | On setups with many disks, we spend a considerable amount of time looking up the process-disk mapping on each queue of io. Testing with a NULL based block driver, this costs 40-50% reduction in throughput for 1000 disks. Signed-off-by: Jens Axboe <axboe@suse.de>
* | [PATCH] for_each_possible_cpu: fixes for generic partKAMEZAWA Hiroyuki2006-03-28
|/ | | | | | | | replaces for_each_cpu with for_each_possible_cpu(). Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Merge branch 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-blockLinus Torvalds2006-03-27
|\ | | | | | | | | | | | | | | | | | | | | | | | | * 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-block: [PATCH] Don't make debugfs depend on DEBUG_KERNEL [PATCH] Fix blktrace compile with sysfs not defined [PATCH] unused label in drivers/block/cciss. [BLOCK] increase size of disk stat counters [PATCH] blk_execute_rq_nowait-speedup [PATCH] ide-cd: quiet down GPCMD_READ_CDVD_CAPACITY failure [BLOCK] ll_rw_blk: kmalloc -> kzalloc conversion [PATCH] kzalloc() conversion in drivers/block [PATCH] update max_sectors documentation
| * [PATCH] Fix blktrace compile with sysfs not definedJens Axboe2006-03-27
| | | | | | | | | | | | | | | | | | debugfs depends on sysfs, so make blktrace kconfig option depend on that. Reported by Adrian Bunk. Signed-off-by: Jens Axboe <axboe@suse.de>
| * [BLOCK] increase size of disk stat countersBen Woodard2006-03-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The kernel's representation of the disk statistics uses the type unsigned which is 32b on both 32b and 64b platforms. Unfortunately, most system tools that work with these numbers that are exported in /proc/diskstats including iostat read these numbers into unsigned longs. This works fine on 32b platforms and when the number of IO transactions are small on 64b platforms. However, when the numbers wrap on 64b platforms & you read the numbers into unsigned longs, and compare the numbers to previous readings, then you get an unsigned representation of a negative number. This looks like a very large 64b number & gives you bizarre readouts in iostat: ilc4: Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util ilc4: sda 5.50 0.00 143.96 0.00 307496983987862656.00 0.00 153748491993931328.00 0.00 2136028725038430.00 7.94 55.12 5.59 80.42 Though fixing iostat in user space is possible, and a quick survey indicates that several other similar tools also use unsigned longs when processing /proc/diskstats. Therefore, it seems like a better approach would be to extend the length of the disk_stats structure on 64b architectures to 64b. The following patch does that. It should not affect the operation on 32b platforms. Signed-off-by: Ben Woodard <woodard@redhat.com> Cc: Rick Lindsley <ricklind@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Jens Axboe <axboe@suse.de>
| * [PATCH] blk_execute_rq_nowait-speedupAndrew Morton2006-03-27
| | | | | | | | | | | | | | | | Both elv_add_request() and generic_unplug_device() grab the queue lock and disable interrupts, do that locally and use the __ variants. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Jens Axboe <axboe@suse.de>
| * [BLOCK] ll_rw_blk: kmalloc -> kzalloc conversionJens Axboe2006-03-27
| | | | | | | | Signed-off-by: Jens Axboe <axboe@suse.de>
* | [PATCH] md: Make sure QUEUE_FLAG_CLUSTER is set properly for md.NeilBrown2006-03-27
|/ | | | | | | | | This flag should be set for a virtual device iff it is set for all underlying devices. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] 2TB files: add blkcnt_tTakashi Sato2006-03-26
| | | | | | | | | | | | | | | | | | | Add blkcnt_t as the type of inode.i_blocks. This enables you to make the size of blkcnt_t either 4 bytes or 8 bytes on 32 bits architecture with CONFIG_LSF. - CONFIG_LSF Add new configuration parameter. - blkcnt_t On h8300, i386, mips, powerpc, s390 and sh that define sector_t, blkcnt_t is defined as u64 if CONFIG_LSF is enabled; otherwise it is defined as unsigned long. On other architectures, it is defined as unsigned long. - inode.i_blocks Change the type from sector_t to blkcnt_t. Signed-off-by: Takashi Sato <sho@tnes.nec.co.jp> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] mempool: use mempool_create_slab_pool()Matthew Dobson2006-03-26
| | | | | | | | | | Modify well over a dozen mempool users to call mempool_create_slab_pool() rather than calling mempool_create() with extra arguments, saving about 30 lines of code and increasing readability. Signed-off-by: Matthew Dobson <colpatch@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* BUG_ON() Conversion in block/elevator.cEric Sesterhenn2006-03-24
| | | | | | | | this changes if() BUG(); constructs to BUG_ON() which is cleaner, contains unlikely() and can better optimized away. Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
* [PATCH] Block queue IO tracing support (blktrace) as of 2006-03-23Jens Axboe2006-03-23
| | | | Signed-off-by: Jens Axboe <axboe@suse.de>
* [PATCH] sem2mutex: blockdev #2Arjan van de Ven2006-03-23
| | | | | | | | | | | | | Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: Jens Axboe <axboe@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] kobj_map semaphore to mutex conversionJes Sorensen2006-03-20
| | | | | | | | | Convert the kobj_map code to use a mutex instead of a semaphore. It converts the single two users as well, genhd.c and char_dev.c. Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* [PATCH] fix rmmod problems with elevator attributes, clean them upAl Viro2006-03-18
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* [PATCH] elevator_t lifetime rules and sysfs fixesAl Viro2006-03-18
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* [PATCH] noise removal: cfq-iosched.cAl Viro2006-03-18
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* [PATCH] don't bother with refcounting for cfq_dataAl Viro2006-03-18
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* [PATCH] fix sysfs interaction and lifetime rules handling for queuesAl Viro2006-03-18
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* [PATCH] fix cfq_get_queue()/ioprio_set(2) racesAl Viro2006-03-18
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* [PATCH] deal with rmmod/put_io_context() racesAl Viro2006-03-18
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* [PATCH] stop elv_unregister() from rogering other iosched's data, fix lockingAl Viro2006-03-18
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* [PATCH] stop cfq from pinning queue downAl Viro2006-03-18
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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