- 07 Aug, 2010 40 commits
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Arnd Bergmann authored
Every user of the BKL in the sd driver is the result of the pushdown from the block layer into the open/close/ioctl functions. The only place that used to rely on the BKL is the sdkp->openers variable, which gets converted into an atomic_t. Nothing else seems to rely on the BKL, since the functions do not touch global data without holding another lock, and the open/close functions are still protected from concurrent execution using the bdev->bd_mutex. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Cc: linux-scsi@vger.kernel.org Cc: "James E.J. Bottomley" <James.Bottomley@suse.de> Acked-by:
Christoph Hellwig <hch@infradead.org> Signed-off-by:
Jens Axboe <jaxboe@fusionio.com>
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Arnd Bergmann authored
The blkpg_ioctl and blkdev_reread_part access fields of the bdev and gendisk structures, yet they always do so under the protection of bdev->bd_mutex, which seems sufficient. Signed-off-by:
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Arnd Bergmann authored
We only call the functions set_device_ro(), invalidate_bdev(), sync_filesystem() and sync_blockdev() while holding the BKL in these commands. All of these are also done in other code paths without the BKL, which leads me to the conclusion that the BKL is not needed here either. The reason we hold it here is that it was originally pushed down into the ioctl function from vfs_ioctl. Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
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Arnd Bergmann authored
The blktrace driver currently needs the BKL, but we should not need to take that in the block layer, so just push it down into the driver itself. It is quite likely that the BKL is not actually required in blktrace code and could be removed in a follow-on patch. Signed-off-by:
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Arnd Bergmann authored
The open and release block_device_operations are currently called with the BKL held. In order to change that, we must first make sure that all drivers that currently rely on this have no regressions. This blindly pushes the BKL into all .open and .release operations for all block drivers to prepare for the next step. The drivers can subsequently replace the BKL with their own locks or remove it completely when it can be shown that it is not needed. The functions blkdev_get and blkdev_put are the only remaining users of the big kernel lock in the block layer, besides a few uses in the ioctl code, none of which need to serialize with blkdev_{get,put}. Most of these two functions is also under the protection of bdev->bd_mutex, including the actual calls to ->open and ->release, and the common code does not access any global data structures that need the BKL. Signed-off-by: -
Arnd Bergmann authored
As a preparation for the removal of the big kernel lock in the block layer, this removes the BKL from the common ioctl handling code, moving it into every single driver still using it. Signed-off-by:
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Arnd Bergmann authored
This fixes the ioctl function of the i2o_block driver, which has multiple problems: * The BLKI2OSRSTRAT and BLKI2OSWSTRAT commands always return -ENOTTY on success, where they should return 0. * Support for 32 bit compat is missing * The driver should use the .ioctl function and because .locked_ioctl is going away. The use of the big kernel lock remains for now, but gets made explictit in the ioctl function. Signed-off-by:
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FUJITA Tomonori authored
We leak a page allocated for discard on some error conditions (e.g. scsi_prep_state_check returns BLKPREP_DEFER in scsi_setup_blk_pc_cmnd). We unprep on requests that weren't prepped in the error path of scsi_init_io. It makes the error path to clean up scsi commands messy. Let's strictly apply the rule that we can't unprep on a request that wasn't prepped. Calling just scsi_put_command() in the error path of scsi_init_io() is enough. We don't set REQ_DONTPREP yet. scsi_setup_discard_cmnd can safely free a page on the error case with the above rule. Signed-off-by:
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by:
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Dave Chinner authored
Add a trace event to the ->writepage loop in write_cache_pages to give visibility into how the ->writepage call is changing variables within the writeback control structure. Of most interest is how wbc->nr_to_write changes from call to call, especially with filesystems that write multiple pages in ->writepage. Signed-off-by:
Dave Chinner <dchinner@redhat.com> Reviewed-by:
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Dave Chinner authored
Tracing high level background writeback events is good, but it doesn't give the entire picture. Add visibility into write throttling to catch IO dispatched by foreground throttling of processing dirtying lots of pages. Signed-off-by:
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Dave Chinner authored
Trace queue/sched/exec parts of the writeback loop. This provides insight into when and why flusher threads are scheduled to run. e.g a sync invocation leaves traces like: sync-[...]: writeback_queue: bdi 8:0: sb_dev 8:1 nr_pages=7712 sync_mode=0 kupdate=0 range_cyclic=0 background=0 flush-8:0-[...]: writeback_exec: bdi 8:0: sb_dev 8:1 nr_pages=7712 sync_mode=0 kupdate=0 range_cyclic=0 background=0 This also lays the foundation for adding more writeback tracing to provide deeper insight into the whole writeback path. The original tracing code is from Jens Axboe, though this version is a rewrite as a result of the code being traced changing significantly. Signed-off-by: -
FUJITA Tomonori authored
Nobody uses REQ_TYPE_LINUX_BLOCK (and its REQ_LB_OP_*). Signed-off-by:
Jeff Garzik <jgarzik@redhat.com> Signed-off-by:
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FUJITA Tomonori authored
This is for block's for-2.6.36. We need to reset q->unprep_rq_fn in sd_remove. Otherwise we hit kernel oops if we access to a scsi disk device via sg after removing scsi disk module. Signed-off-by:
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FUJITA Tomonori authored
This removes q->prepare_flush_fn completely (changes the blk_queue_ordered API). Signed-off-by:
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FUJITA Tomonori authored
use REQ_FLUSH flag instead. Signed-off-by:
David S. Miller <davem@davemloft.net> Reviewed-by:
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FUJITA Tomonori authored
use REQ_FLUSH flag instead. Signed-off-by:
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FUJITA Tomonori authored
use REQ_FLUSH flag instead. Signed-off-by:
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FUJITA Tomonori authored
REQ_FLUSH flag enables us to kill ps3disk_prepare_flush(). Signed-off-by:
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FUJITA Tomonori authored
use REQ_FLUSH flag instead. Signed-off-by:
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FUJITA Tomonori authored
scsi-ml builds flush requests via q->prepare_flush_fn(), however, builds discard requests via q->prep_rq_fn. Using two different mechnisms for the similar requests (building commands in SCSI ULD) doesn't make sense. Handing both via q->prep_rq_fn makes the code design simpler. Signed-off-by:
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FUJITA Tomonori authored
This is preparation for removing q->prepare_flush_fn. Temporarily, blk_queue_ordered() permits QUEUE_ORDERED_DO_PREFLUSH and QUEUE_ORDERED_DO_POSTFLUSH without prepare_flush_fn. Signed-off-by:
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FUJITA Tomonori authored
SCSI-ml needs a way to mark a request as flush request in q->prepare_flush_fn because it needs to identify them later (e.g. in q->request_fn or prep_rq_fn). queue_flush sets REQ_HARDBARRIER in rq->cmd_flags however the block layer also sends normal REQ_TYPE_FS requests with REQ_HARDBARRIER. So SCSI-ml can't use REQ_HARDBARRIER to identify flush requests. We could change the block layer to clear REQ_HARDBARRIER bit before sending non flush requests to the lower layers. However, intorudcing the new flag looks cleaner (surely easier). Signed-off-by:
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FUJITA Tomonori authored
- sd_done isn't called for pc request so we never call the code. - we use sd_unprep to free discard page now. Signed-off-by:
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FUJITA Tomonori authored
This fixes discard page leak by using q->unprep_rq_fn facility. q->unprep_rq_fn is called when all the data buffer (req->bio and scsi_data_buffer) in the request is freed. sd_unprep() uses rq->buffer to free discard page allocated in sd_prepare_discard(). Signed-off-by:
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James Bottomley authored
Reviewed-by:
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Joe Perches authored
- add pr_fmt. - convert printks to pr_<level> - add if (0) and printf argument checking to cdinfo - coalesce consecutive printks to single pr_ - fix a typo "back ground" to "background" - convert printks without level to pr_info - remove VIOCD_ prefixes and use pr_fmt/pr_<level> - add a missing newline to an OS/400 message Signed-off-by:
Joe Perches <joe@perches.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Folded in tab indentation fix from Andrew. Signed-off-by:
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Jens Axboe authored
Didn't cause a merge conflict, so fixed this one up manually post merge. Signed-off-by: -
Randy Dunlap authored
Fix extra brace typo that is causing build errors. Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by:
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Andi Kleen authored
No real bugs I believe, just some dead code, and some shut up code. Signed-off-by:
Andi Kleen <ak@linux.intel.com> Cc: Eric Paris <eparis@redhat.com> Signed-off-by:
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Andi Kleen authored
Just some dead code. Signed-off-by:
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Christoph Hellwig authored
Allocating a fixed payload for discard requests always was a horrible hack, and it's not coming to byte us when adding support for discard in DM/MD. So change the code to leave the allocation of a payload to the lowlevel driver. Unfortunately that means we'll need another hack, which allows us to update the various block layer length fields indicating that we have a payload. Instead of hiding this in sd.c, which we already partially do for UNMAP support add a documented helper in the core block layer for it. Signed-off-by:
Mike Snitzer <snitzer@redhat.com> Signed-off-by:
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Christoph Hellwig authored
Move all code for the writeback thread into fs/fs-writeback.c instead of splitting it over two functions in two files. Signed-off-by:
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Christoph Hellwig authored
The wb_list member of struct backing_device_info always has exactly one element. Just use the direct bdi->wb pointer instead and simplify some code. Also remove bdi_task_init which is now trivial to prepare for the next patch. Signed-off-by:
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Christoph Hellwig authored
Signed-off-by:
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Jens Axboe authored
On compilation, gcc correctly detects that we do not handle all types: In function ‘blk_done’: warning: enumeration value ‘REQ_TYPE_FS’ not handled in switch warning: enumeration value ‘REQ_TYPE_SENSE’ not handled in switch warning: enumeration value ‘REQ_TYPE_PM_SUSPEND’ not handled in switch warning: enumeration value ‘REQ_TYPE_PM_RESUME’ not handled in switch warning: enumeration value ‘REQ_TYPE_PM_SHUTDOWN’ not handled in switch warning: enumeration value ‘REQ_TYPE_LINUX_BLOCK’ not handled in switch warning: enumeration value ‘REQ_TYPE_ATA_TASKFILE’ not handled in switch warning: enumeration value ‘REQ_TYPE_ATA_PC’ not handled in switch which is a bit pointless since this is at the end of the request processessing. Add a default case that just breaks out. Signed-off-by: -
Christoph Hellwig authored
Remove the current bio flags and reuse the request flags for the bio, too. This allows to more easily trace the type of I/O from the filesystem down to the block driver. There were two flags in the bio that were missing in the requests: BIO_RW_UNPLUG and BIO_RW_AHEAD. Also I've renamed two request flags that had a superflous RW in them. Note that the flags are in bio.h despite having the REQ_ name - as blkdev.h includes bio.h that is the only way to go for now. Signed-off-by:
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Christoph Hellwig authored
Remove all the trivial wrappers for the cmd_type and cmd_flags fields in struct requests. This allows much easier grepping for different request types instead of unwinding through macros. Signed-off-by:
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FUJITA Tomonori authored
Architectures don't need to define ISA_DMA_THRESHOLD anymore. Signed-off-by:
James Bottomley <James.Bottomley@suse.de> Acked-by:
David Howells <dhowells@redhat.com> Signed-off-by:
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FUJITA Tomonori authored
block uses ISA_DMA_THRESHOLD for BLK_BOUNCE_ISA. Only SCSI uses ISA_DMA_THRESHOLD for ancient drivers with non-zero unchecked_isa_dma. Nowadays drivers (and subsystems) use dma_mask properly instead of ISA_DMA_THRESHOLD. Documentation/scsi/scsi_mid_low_api.txt says: unchecked_isa_dma - 1=>only use bottom 16 MB of ram (ISA DMA addressing restriction), 0=>can use full 32 bit (or better) DMA address space So block simply uses DMA_BIT_MASK(24) for BLK_BOUNCE_ISA for SCSI. Signed-off-by: -
FUJITA Tomonori authored
We can safely remove ISA_DMA_THRESHOLD usage in aha1542. aha1542 uses ISA_DMA_THRESHOLD to see if: - the buffers in scatter/list are below 16MB. - scsi_host is below 16MB. Both checkings were added in the ancient times but aren't necessary nowadays since we properly bounce the buffers and allocate scsi_host below 16MB with non-zero unchecked_isa_dma. Signed-off-by:
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