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2006-04-18[PATCH] cfq: Further rbtree traversal and cfq_exit_queue() race fixOGAWA Hirofumi
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>
2006-04-18[PATCH 2/2] cfq: fix cic's rbtree traversalOGAWA Hirofumi
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>
2006-04-18[PATCH 1/2] iosched: fix typo and barrier()OGAWA Hirofumi
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>
2006-04-13[SCSI] unify SCSI_IOCTL_SEND_COMMAND implementationsChristoph Hellwig
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>
2006-04-02Documentation: fix minor kernel-doc warningsMartin Waitz
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>
2006-03-31[PATCH] config: fix CONFIG_LFS optionTrond Myklebust
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>
2006-03-31[PATCH] Don't pass boot parameters to argv_init[]OGAWA Hirofumi
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>
2006-03-31[PATCH] Simplify proc/devices and fix early termination regressionJoe Korty
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>
2006-03-28Merge branch 'cfq-merge' of git://brick.kernel.dk/data/git/linux-2.6-blockLinus Torvalds
* '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
2006-03-28[PATCH] for_each_possible_cpu: fixes for generic partKAMEZAWA Hiroyuki
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>
2006-03-28[BLOCK] cfq-iosched: seek and async performance fixesJens Axboe
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>
2006-03-28[PATCH] ll_rw_blk: fix 80-col offender in put_io_context()Jens Axboe
This makes akpm more happy. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-03-28[PATCH] cfq-iosched: small cfq_choose_req() optimizationAndreas Mohr
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>
2006-03-28[PATCH] [BLOCK] cfq-iosched: change cfq io context linking from list to treeJens Axboe
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>
2006-03-27Merge branch 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-blockLinus Torvalds
* '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
2006-03-27[PATCH] md: Make sure QUEUE_FLAG_CLUSTER is set properly for md.NeilBrown
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>
2006-03-27[PATCH] Fix blktrace compile with sysfs not definedJens Axboe
debugfs depends on sysfs, so make blktrace kconfig option depend on that. Reported by Adrian Bunk. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-03-27[BLOCK] increase size of disk stat countersBen Woodard
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>
2006-03-27[PATCH] blk_execute_rq_nowait-speedupAndrew Morton
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>
2006-03-27[BLOCK] ll_rw_blk: kmalloc -> kzalloc conversionJens Axboe
Signed-off-by: Jens Axboe <axboe@suse.de>
2006-03-26[PATCH] 2TB files: add blkcnt_tTakashi Sato
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>
2006-03-26[PATCH] mempool: use mempool_create_slab_pool()Matthew Dobson
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>
2006-03-24BUG_ON() Conversion in block/elevator.cEric Sesterhenn
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>
2006-03-23[PATCH] Block queue IO tracing support (blktrace) as of 2006-03-23Jens Axboe
Signed-off-by: Jens Axboe <axboe@suse.de>
2006-03-23[PATCH] sem2mutex: blockdev #2Arjan van de Ven
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>
2006-03-20[PATCH] kobj_map semaphore to mutex conversionJes Sorensen
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>
2006-03-18[PATCH] fix rmmod problems with elevator attributes, clean them upAl Viro
2006-03-18[PATCH] elevator_t lifetime rules and sysfs fixesAl Viro
2006-03-18[PATCH] noise removal: cfq-iosched.cAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] don't bother with refcounting for cfq_dataAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] fix sysfs interaction and lifetime rules handling for queuesAl Viro
2006-03-18[PATCH] fix cfq_get_queue()/ioprio_set(2) racesAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] deal with rmmod/put_io_context() racesAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] stop elv_unregister() from rogering other iosched's data, fix lockingAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] stop cfq from pinning queue downAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] make cfq_exit_queue() prune the cfq_io_context for that queueAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] fix the exclusion for ioprio_set()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] keep sync and async cfq_queue separateAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] switch to use of ->key to get cfq_data by cfq_io_contextAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] stop leaking cfq_data in cfq_set_request()Al Viro
We don't need to pin ->key down; ->cfqq->cfqd will do that for us. Incidentally, that stops the leak we had - that reference was never dropped. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] fix cfq hash lookupsAl Viro
If somebody does a hash lookup for cfq_queue while ioprio of an async queue is elevated, they shouldn't end up stuck with lowered ioprio when we go back. Fix is to use ->org_ioprio{,class} in hash lookups. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] fix locking in queue_requests_store()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-18[PATCH] fix double-free in blk_init_queue_node()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-03-08[PATCH] block: disable block layer bouncing for most memory on 64bit systemsAndi Kleen
The low level PCI DMA mapping functions should handle it in most cases. This should fix problems with depleting the DMA zone early. The old code used precious GFP_DMA memory in many cases where it was not needed. Signed-off-by: Andi Kleen <ak@suse.de> Cc: Jens Axboe <axboe@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-28[PATCH] cfq-iosched: slice expiry fixupsJens Axboe
During testing of SLES10, we encountered a hang in the CFQ io scheduler. Turns out the deferred slice expiry logic is buggy, so remove that for now. We could be left with an idle queue that would never wake up. So kill that logic, always expire immediately. Also fix a potential timer race condition. Patch looks bigger than it is, because it moves a function. Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-08Merge branch 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-blockLinus Torvalds
2006-02-08[PATCH] block: implement elv_insert and use it (fix ordcolor flipping bug)Tejun Heo
q->ordcolor must only be flipped on initial queueing of a hardbarrier request. Constructing ordered sequence and requeueing used to pass through __elv_add_request() which flips q->ordcolor when it sees a barrier request. This patch separates out elv_insert() from __elv_add_request() and uses elv_insert() when constructing ordered sequence and requeueing. elv_insert() inserts the given request at the specified position and does nothing else. Signed-off-by: Tejun Heo <htejun@gmail.com> Acked-by: Jens Axboe <axboe@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-08[PATCH] blk: Fix SG_IO ioctl failure retry loopingJens Axboe
When issuing an SG_IO ioctl through sd that resulted in an unrecoverable error, a nearly infinite retry loop was discovered. This is due to the fact that the block layer SG_IO code is not setting up rq->retries. This patch also fixes up the sg_scsi_ioctl path. Signed-off-by: Brian King <brking@us.ibm.com> Signed-off-by: Jens Axboe <axboe@suse.de>
2006-02-05[PATCH] block: request_queue->ordcolor must not be flipped on SOFTBARRIERTejun Heo
q->ordcolor must not be flipped on SOFTBARRIER. Signed-off-by: Tejun Heo <htejun@gmail.com> Acked-by: Jens Axboe <axboe@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-05[PATCH] fix ordering on requeued request drainageJens Axboe
Previously, if a fs request which was being drained failed and got requeued, blk_do_ordered() didn't allow it to be reissued, which causes queue stall. This patch makes blk_do_ordered() use the sequence of each request to determine whether a request can be issued or not. This fixes the bug and simplifies code. Signed-off-by: Tejun Heo <htejun@gmail.com> Acked-by: Jens Axboe <axboe@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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