Keith Mannthey 08bafc0341 block: Supress Buffer I/O errors when SCSI REQ_QUIET flag set ... Allow the scsi request REQ_QUIET flag to be propagated to the buffer file system layer. The basic ideas is to pass the flag from the scsi request to the bio (block IO) and then to the buffer layer. The buffer layer can then suppress needless printks. This patch declutters the kernel log by removed the 40-50 (per lun) buffer io error messages seen during a boot in my multipath setup . It is a good chance any real errors will be missed in the "noise" it the logs without this patch. During boot I see blocks of messages like " __ratelimit: 211 callbacks suppressed Buffer I/O error on device sdm, logical block 5242879 Buffer I/O error on device sdm, logical block 5242879 Buffer I/O error on device sdm, logical block 5242847 Buffer I/O error on device sdm, logical block 1 Buffer I/O error on device sdm, logical block 5242878 Buffer I/O error on device sdm, logical block 5242879 Buffer I/O error on device sdm, logical block 5242879 Buffer I/O error on device sdm, logical block 5242879 Buffer I/O error on device sdm, logical block 5242879 Buffer I/O error on device sdm, logical block 5242872 " in my logs. My disk environment is multipath fiber channel using the SCSI_DH_RDAC code and multipathd. This topology includes an "active" and "ghost" path for each lun. IO's to the "ghost" path will never complete and the SCSI layer, via the scsi device handler rdac code, quick returns the IOs to theses paths and sets the REQ_QUIET scsi flag to suppress the scsi layer messages. I am wanting to extend the QUIET behavior to include the buffer file system layer to deal with these errors as well. I have been running this patch for a while now on several boxes without issue. A few runs of bonnie++ show no noticeable difference in performance in my setup. Thanks for John Stultz for the quiet_error finalization. Submitted-by: Keith Mannthey <kmannth@us.ibm.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>		2008-12-29 08:28:44 +01:00
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as-iosched.c	block: as/cfq ssd idle check update	2008-10-09 08:56:19 +02:00
blk-barrier.c	block: internal dequeue shouldn't start timer	2008-12-03 12:41:26 +01:00
blk-core.c	block: Supress Buffer I/O errors when SCSI REQ_QUIET flag set	2008-12-29 08:28:44 +01:00
blk-exec.c	Add some block/ source files to the kernel-api docbook. Fix kernel-doc 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.	2008-10-09 08:56:03 +02:00
blk-integrity.c	block: Switch blk_integrity_compare from bdev to gendisk	2008-10-09 08:56:21 +02:00
blk-ioc.c	cfq-iosched: fix RCU race in the cfq io_context destructor handling	2008-05-07 09:28:57 +02:00
blk-map.c	When block layer fails to map iov, it calls bio_unmap_user to undo	2008-12-03 12:41:20 +01:00
blk-merge.c	block: remove unused ll_new_mergeable()	2008-11-06 08:41:55 +01:00
blk-settings.c	block: fix setting of max_segment_size and seg_boundary mask	2008-12-03 12:55:55 +01:00
blk-softirq.c	block: add fault injection mechanism for faking request timeouts	2008-10-09 08:56:17 +02:00
blk-sysfs.c	block: don't take lock on changing ra_pages	2008-12-29 08:28:43 +01:00
blk-tag.c	block/blk-tag.c: cleanup kernel-doc	2008-12-29 08:28:43 +01:00
blk-timeout.c	block: leave the request timeout timer running even on an empty list	2008-12-29 08:28:42 +01:00
blk.h	block: remove __generic_unplug_device() from exports	2008-10-17 14:03:08 +02:00
blktrace.c	blktrace: port to tracepoints	2008-11-26 12:13:34 +01:00
bsg.c	Enforce a minimum SG_IO timeout	2008-12-05 14:49:18 -08:00
cfq-iosched.c	block: as/cfq ssd idle check update	2008-10-09 08:56:19 +02:00
cmd-filter.c	[PATCH] introduce fmode_t, do annotations	2008-10-21 07:47:06 -04:00
compat_ioctl.c	block: don't take lock on changing ra_pages	2008-12-29 08:28:43 +01:00
deadline-iosched.c	deadline-iosched: non-functional fixes	2008-10-09 08:56:03 +02:00
elevator.c	Merge branches 'tracing/ftrace', 'tracing/function-graph-tracer' and 'tracing/urgent' into tracing/core	2008-12-05 14:45:22 +01:00
genhd.c	block: set disk->node_id before it's being used	2008-12-03 12:41:20 +01:00
ioctl.c	block: don't take lock on changing ra_pages	2008-12-29 08:28:43 +01:00
Kconfig	blktrace: port to tracepoints	2008-11-26 12:13:34 +01:00
Kconfig.iosched	update I/O sched Kconfig help texts - CFQ is now default, not AS.	2007-02-17 20:08:22 +01:00
Makefile	block: unify request timeout handling	2008-10-09 08:56:13 +02:00
noop-iosched.c	block: let elv_register() return void	2007-12-18 08:29:28 +01:00
scsi_ioctl.c	scsi-ioctl: use clock_t <> jiffies	2008-12-29 08:28:42 +01:00