kernel/linux.git/block/blktrace.c, branch linux-2.6.28.y

blktrace: use BLKTRACE_BDEV_SIZE as the name size for setup structure

2008-10-09T06:56:20+00:00

Define as 32, which is is what BDEVNAME_SIZE is/was as well. This keeps the user interface the same and gets rid of the difference between kernel and user api here. Signed-off-by: Jens Axboe

blktrace: simplify flags handling in __blk_add_trace

2008-10-09T06:56:01+00:00

Let the compiler see what's going on, and it can all get a lot simpler. On PPC64 this reduces the size of the code calculating these bits by about 60%. On x86_64 it's less of a win -- only 40%. Signed-off-by: David Woodhouse Signed-off-by: Jens Axboe

blktrace: support discard requests

2008-10-09T06:56:01+00:00

Signed-off-by: David Woodhouse Signed-off-by: Jens Axboe

Added in user-injected messages into blk traces

2008-07-03T11:21:12+00:00

This allows a user to annotate the blk trace stream: writing a suitable message to {/sys/kernel/debug}/block//msg will have it propagated into the trace stream. Signed-off-by: Alan D. Brunelle Signed-off-by: Jens Axboe

block: disable IRQs until data is written to relay channel

2008-06-12T18:20:57+00:00

As we may run relay_reserve from interrupt context we must always disable IRQs. This is because a call to relay_reserve may expose previously written data to use space. Updated new message code and an old but related comment. Signed-off-by: Carl Henrik Lunde Signed-off-by: Jens Axboe Signed-off-by: Linus Torvalds

block: make blktrace use per-cpu buffers for message notes

2008-05-28T12:49:27+00:00

Currently it uses a single static char array, but that risks being corrupted when multiple users issue message notes at the same time. Make the buffers dynamically allocated when the trace is setup and make them per-cpu instead. The default max message size of 1k is also very large, the interface is mainly for small text notes. So shrink it to 128 bytes. Signed-off-by: Jens Axboe

Added in MESSAGE notes for blktraces

2008-05-28T12:49:27+00:00

Allows messages to be inserted into blktrace streams. Signed-off-by: Alan D. Brunelle Signed-off-by: Jens Axboe

Fix misuses of bdevname()

2008-05-13T15:02:26+00:00

bdevname() fills the buffer that it is given as a parameter, so calling strcpy() or snprintf() on the returned value is redundant (and probably not guaranteed to work - I don't think strcpy and snprintf support overlapping buffers.) Signed-off-by: Jean Delvare Cc: Stephen Tweedie Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

blktrace: Add blktrace ioctls to SCSI generic devices

2008-01-28T09:04:46+00:00

Since the SCSI layer uses the request queues from the block layer, blktrace can also be used to trace the requests to all SCSI devices (like SCSI tape drives), not only disks. The only missing part is the ioctl interface to start and stop tracing. This patch adds the SETUP, START, STOP and TEARDOWN ioctls from blktrace to the sg device files. With this change, blktrace can be used for SCSI devices like for disks, e.g.: blktrace -d /dev/sg1 -o - | blkparse -i - Signed-off-by: Christof Schmitt Signed-off-by: Jens Axboe

blktrace: kill the unneeded initcall

2008-01-11T12:37:01+00:00

It just inits the mutex, we can do that with DEFINE_MUTEX() instead. Signed-off-by: Jens Axboe