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2006-09-30[PATCH] BLOCK: Move extern declarations out of fs/*.c into header files [try #6]David Howells
Create a new header file, fs/internal.h, for common definitions local to the sources in the fs/ directory. Move extern definitions that should be in header files from fs/*.c to fs/internal.h or other main header files where they span directories. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30[PATCH] BLOCK: Don't call block_sync_page() from AFS [try #6]David Howells
The AFS filesystem no longer needs to override its sync_page() op. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30[PATCH] BLOCK: Separate the bounce buffering code from the highmem code [try #6]David Howells
Move the bounce buffer code from mm/highmem.c to mm/bounce.c so that it can be more easily disabled when the block layer is disabled. !!!NOTE!!! There may be a bug in this code: Should init_emergency_pool() be contingent on CONFIG_HIGHMEM? Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30[PATCH] BLOCK: Stop fallback_migrate_page() from using page_has_buffers() ↵David Howells
[try #6] Stop fallback_migrate_page() from using page_has_buffers() since that might not be available. Use PagePrivate() instead since that's more general. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30[PATCH] BLOCK: Remove duplicate declaration of exit_io_context() [try #6]David Howells
Remove the duplicate declaration of exit_io_context() from linux/sched.h. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30[PATCH] BLOCK: Move functions out of buffer code [try #6]David Howells
Move some functions out of the buffering code that aren't strictly buffering specific. This is a precursor to being able to disable the block layer. (*) Moved some stuff out of fs/buffer.c: (*) The file sync and general sync stuff moved to fs/sync.c. (*) The superblock sync stuff moved to fs/super.c. (*) do_invalidatepage() moved to mm/truncate.c. (*) try_to_release_page() moved to mm/filemap.c. (*) Moved some related declarations between header files: (*) declarations for do_invalidatepage() and try_to_release_page() moved to linux/mm.h. (*) __set_page_dirty_buffers() moved to linux/buffer_head.h. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30[PATCH] blktrace: cleanup using on_each_cpuMartin Peschke
This patch kills a few lines of code in blktrace by making use of on_each_cpu(). Signed-off-by: Martin Peschke <mp3@de.ibm.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30[PATCH] Don't need to disable interrupts for tasklist_lockOleg Nesterov
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30[PATCH] exit_io_context: don't disable irqsOleg Nesterov
We don't need to disable irqs to clear current->io_context, it is protected by ->alloc_lock. Even IF it was possible to submit I/O from IRQ on behalf of current this irq_disable() can't help: current_io_context() will re-instantiate ->io_context after irq_enable(). We don't need task_lock() or local_irq_disable() to clear ioc->task. This can't prevent other CPUs from playing with our io_context anyway. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30[PATCH] SCSI: scsi_done_q is unusedJens Axboe
It is a leftover from before the softirq completion was migrated to the block layer. Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30[PATCH] blktrace: support for logging metadata readsJens Axboe
Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] cfq-iosched: use metadata read flagJens Axboe
Give meta data reads preference over regular reads, as the process often needs to get that out of the way to do the io it was actually interested in. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] ext3: make meta data reads use READ_METAJens Axboe
Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] Allow file systems to differentiate between data and meta readsJens Axboe
We can use this information for making more intelligent priority decisions, and it will also be useful for blktrace. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] ll_rw_blk: allow more flexibility for read_ahead_kb storeJens Axboe
It can make sense to set read-ahead larger than a single request. We should not be enforcing such policy on the user. Additionally, using the BLKRASET ioctl doesn't impose such a restriction. So additionally we now expose identical behaviour through the two. Issue also reported by Anton <cbou@mail.ru> Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] cfq-iosched: improve queue preemptionJens Axboe
Don't touch the current queues, just make sure that the wanted queue is selected next. Simplifies the logic. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] Add blk_start_queueing() helperJens Axboe
CFQ implements this on its own now, but it's really block layer knowledge. Tells a device queue to start dispatching requests to the driver, taking care to unplug if needed. Also fixes the issue where as/cfq will invoke a stopped queue, which we really don't want. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] cfq-iosched: kill the empty_listJens Axboe
No point in having a place holder list just for empty queues, so remove it. It's not used for anything other than to keep ->cfq_list busy. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] cfq-iosched: Kill O(N) runtime of cfq_resort_rr_list()Jens Axboe
Currently it scales with number of processes in that priority group, which is potentially not very nice as it's called quite often. Basically we always need to do tail inserts, except for the case of a new process. So just mark/detect a queue as such. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] Make sure all block/io scheduler setups are node awareJens Axboe
Some were kmalloc_node(), some were still kmalloc(). Change them all to kmalloc_node(). Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] Kill various deprecated/unused block layer defines/functionsJens Axboe
Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] Audit block layer inlinesJens Axboe
Kill a few inlines that bring in too much code to more than one location Shrinks kernel text by about 300 bytes on 32-bit x86. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] cfq-iosched: use new io context counting mechanismJens Axboe
It's ok if the read path is a lot more costly, as long as inc/dec is really cheap. The inc/dec will happen for each created/freed io context, while the reading only happens when a disk queue exits. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] as-iosched: use new io context counting mechanismJens Axboe
It's ok if the read path is a lot more costly, as long as inc/dec is really cheap. The inc/dec will happen for each created/freed io context, while the reading only happens when a disk queue exits. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] elevator: define ioc counting mechanismJens Axboe
None of the in-kernel primitives for handling "atomic" counting seem to be a good fit. We need something that is essentially free for incrementing/decrementing, while the read side may be more expensive as we only ever need to do that when a device is removed from the kernel. Use a per-cpu variable for maintaining a per-cpu ioc count and define a reading mechanism that just sums up the values. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] cfq-iosched: kill cfq_exit_lockJens Axboe
cfq_exit_lock is protecting two things now: - The per-ioc rbtree of cfq_io_contexts - The per-cfqd linked list of cfq_io_contexts The per-cfqd linked list can be protected by the queue lock, as it is (by definition) per cfqd as the queue lock is. The per-ioc rbtree is mainly used and updated by the process itself only. The only outside use is the io priority changing. If we move the priority changing to not browsing the rbtree, we can remove any locking from the rbtree updates and lookup completely. Let the sys_ioprio syscall just mark processes as having the iopriority changed and lazily update the private cfq io contexts the next time io is queued, and we can remove this locking as well. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] cfq-iosched: cleanups, fixes, dead code removalJens Axboe
A collection of little fixes and cleanups: - We don't use the 'queued' sysfs exported attribute, since the may_queue() logic was rewritten. So kill it. - Remove dead defines. - cfq_set_active_queue() can be rewritten cleaner with else if conditions. - Several places had cfq_exit_cfqq() like logic, abstract that out and use that. - Annotate the cfqq kmem_cache_alloc() so the allocator knows that this is a repeat allocation if it fails with __GFP_WAIT set. Allows the allocator to start freeing some memory, if needed. CFQ already loops for this condition, so might as well pass the hint down. - Remove cfqd->rq_starved logic. It's not needed anymore after we dropped the crq allocation in cfq_set_request(). - Remove uneeded parameter passing. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] struct request: shrink and optimize some moreJens Axboe
Move some members around and unionize completion_data and rb_node since they cannot ever be used at the same time. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] ll_rw_blk: cleanup __make_request()Jens Axboe
- Don't assign variables that are only used once. - Kill spin_lock() prefetching, it's opportunistic at best. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] Drop useless bio passing in may_queue/set_request APIJens Axboe
It's not needed for anything, so kill the bio passing. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] Remove ->rq_status from struct requestJens Axboe
After Christophs SCSI change, the only usage left is RQ_ACTIVE and RQ_INACTIVE. The block layer sets RQ_INACTIVE right before freeing the request, so any check for RQ_INACTIVE in a driver is a bug and indicates use-after-free. So kill/clean the remaining users, straight forward. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] Remove struct request_list from struct requestJens Axboe
It is always identical to &q->rq, and we only use it for detecting whether this request came out of our mempool or not. So replace it with an additional ->flags bit flag. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] Remove ->waiting member from struct requestJens Axboe
As the comments indicates in blkdev.h, we can fold it into ->end_io_data usage as that is really what ->waiting is. Fixup the users of blk_end_sync_rq(). Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-09-30[PATCH] as-iosched: kill arqJens Axboe
Get rid of the as_rq request type. With the added elevator_private2, we have enough room in struct request to get rid of any arq allocation/free for each request. Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Nick Piggin <npiggin@suse.de>
2006-09-30[PATCH] cfq-iosched: kill crqJens Axboe
Get rid of the cfq_rq request type. With the added elevator_private2, we have enough room in struct request to get rid of any crq allocation/free for each request. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] Add one more pointer to struct request for IO scheduler usageJens Axboe
Then we have enough room in the request to get rid of the dynamic allocations in CFQ/AS. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] cfq-iosched: remove the crq flag functions/variableJens Axboe
There's just one flag currently (SYNC), and that one can be grabbed from the request. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] deadline-iosched: remove elevator private drq request typeJens Axboe
A big win, we now save an allocation/free on each request! With the previous rb/hash abstractions, we can just reuse queuelist/donelist for the FIFO data and be done with it. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] as-iosched: remove arq->is_sync memberJens Axboe
We can track this in struct request. Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Nick Piggin <npiggin@suse.de>
2006-09-30[PATCH] as-iosched: reuse rq for fifoJens Axboe
Saves some space in arq. Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Nick Piggin <npiggin@suse.de>
2006-09-30[PATCH] cfq-iosched: convert to using the FIFO elevator definesJens Axboe
Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] elevator: introduce a way to reuse rq for internal FIFO handlingJens Axboe
The io schedulers can use this instead of having to allocate space for it themselves. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] deadline-iosched: migrate to using the elevator rb functionsJens Axboe
This removes the rbtree handling from deadline. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] cfq-iosched: migrate to using the elevator rb functionsJens Axboe
This removes the rbtree handling from CFQ. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] as-iosched: migrate to using the elevator rb functionsJens Axboe
This removes the rbtree handling from AS. Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Nick Piggin <npiggin@suse.de>
2006-09-30[PATCH] elevator: abstract out the rbtree sort handlingJens Axboe
The rbtree sort/lookup/reposition logic is mostly duplicated in cfq/deadline/as, so move it to the elevator core. The io schedulers still provide the actual rb root, as we don't want to impose any sort of specific handling on the schedulers. Introduce the helpers and rb_node in struct request to help migrate the IO schedulers. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] rbtree: fixed reversed RB_EMPTY_NODE and rb_next/prevJens Axboe
The conditions got reserved. Also make rb_next() and rb_prev() check for the empty condition. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] elevator: move the backmerging logic into the elevator coreJens Axboe
Right now, every IO scheduler implements its own backmerging (except for noop, which does no merging). That results in duplicated code for essentially the same operation, which is never a good thing. This patch moves the backmerging out of the io schedulers and into the elevator core. We save 1.6kb of text and as a bonus get backmerging for noop as well. Win-win! Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] Split struct request ->flags into two partsJens Axboe
Right now ->flags is a bit of a mess: some are request types, and others are just modifiers. Clean this up by splitting it into ->cmd_type and ->cmd_flags. This allows introduction of generic Linux block message types, useful for sending generic Linux commands to block devices. Signed-off-by: Jens Axboe <axboe@suse.de>
2006-09-30[PATCH] i2c: Prevent deadlock on i2c client registrationJean Delvare
Delay the call to adapter->client_register() until after we are certain that the client registration is a success. At this point the client is fully initialized and we no longer hold the adapter->clist mutex, so this should prevent the deadlocks if the client_register() callback needs to take that mutex too, as is the case for the bttv driver. This fixes bug #7234. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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