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  1. 18 Feb, 2009 9 commits
    • Neil Brown's avatar
      block: fix booting from partitioned md array · 41b8c853
      Neil Brown authored 
      Hi Tejun,

 it looks like your commit:

   block: don't depend on consecutive minor space
   f331c029

 broke a particular case for booting from partitioned md/raid devices.
 That is the second time this has been broken recently.  The previous
 time was fixed by

   block: do_mounts - accept root=<non-existant partition>
   30f2f0eb

 Because the data isn't available when an md device is first created
 (we add disks and set it up after creation), the initial partition
 scan finds nothing.  It is not until the device is opened that
 another partition scan happens and finds something.

 So at the point where the kernel parameter "root=/dev/md_d0p1" is
 being parsed, md_d0 exists, but md_d0p1 does not.
 However if we let blk_lookup_devt return the correct device number
 even though the device doesn't exist, then the attempt to mount it
 will successfully find the partition.

 I have tried in the past to find a way to get the partition table to
 be read as soon as the array is assembled but that proved impossible
 (at the time).  I don't remember the details, and could possibly
 revisit it.  However it would be really nice if blk_lookup_devt
 could be adjusted to again accept non existant partitions.
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      41b8c853
    • Jens Axboe's avatar
      block: revert part of 18ce3751 · 78f707bf
      Jens Axboe authored 
      The above commit added WRITE_SYNC and switched various places to using
that for committing writes that will be waited upon immediately after
submission. However, this causes a performance regression with AS and CFQ
for ext3 at least, since sync_dirty_buffer() will submit some writes with
WRITE_SYNC while ext3 has sumitted others dependent writes without the sync
flag set. This causes excessive anticipation/idling in the IO scheduler
because sync and async writes get interleaved, causing a big performance
regression for the below test case (which is meant to simulate sqlite
like behaviour).

---- test case ----

int main(int argc, char **argv)
{

	int fdes, i;
	FILE *fp;
	struct timeval start;
	struct timeval end;
	struct timeval res;

	gettimeofday(&start, NULL);
	for (i=0; i<ROWS; i++) {
		fp = fopen("test_file", "a");
		fprintf(fp, "Some Text Data\n");
		fdes = fileno(fp);
		fsync(fdes);
		fclose(fp);
	}
	gettimeofday(&end, NULL);

	timersub(&end, &start, &res);
	fprintf(stdout, "time to write %d lines is %ld(msec)\n", ROWS,
			(res.tv_sec*1000000 + res.tv_usec)/1000);

	return 0;
}

-------------------

Thanks to Sean.White@APCC.com for tracking down this performance
regression and providing a test case.
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      78f707bf
    • Chip Coldwell's avatar
      cciss: PCI power management reset for kexec · 82eb03cf
      Chip Coldwell authored 
      The kexec kernel resets the CCISS hardware in three steps:

1. Use PCI power management states to reset the controller in the
   kexec kernel.

2. Clear the MSI/MSI-X bits in PCI configuration space so that MSI
   initialization in the kexec kernel doesn't fail.

3. Use the CCISS "No-op" message to determine when the controller
   firmware has recovered from the PCI PM reset.

[akpm@linux-foundation.org: cleanups]
Signed-off-by: default avatarMike Miller <mike.miller@hp.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      82eb03cf
    • Roel Kluin's avatar
      paride/pg.c: xs(): &&/|| confusion · c8cbec6b
      Roel Kluin authored 
      &&/|| confusion
Signed-off-by: default avatarRoel Kluin <roel.kluin@gmail.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      c8cbec6b
    • Subhash Peddamallu's avatar
      fs/bio: bio_alloc_bioset: pass right object ptr to mempool_free · a60e78e5
      Subhash Peddamallu authored 
      When freeing from bio pool use right ptr to account for bs->front_pad,
instead of bio ptr,
Signed-off-by: default avatarSubhash Peddamallu <subhash.peddamallu@gmail.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      a60e78e5
    • Jens Axboe's avatar
      block: fix bad definition of BIO_RW_SYNC · 93dbb393
      Jens Axboe authored 
      We can't OR shift values, so get rid of BIO_RW_SYNC and use BIO_RW_SYNCIO
and BIO_RW_UNPLUG explicitly. This brings back the behaviour from before
213d9417.
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      93dbb393
    • Boaz Harrosh's avatar
      bsg: Fix sense buffer bug in SG_IO · c1c20120
      Boaz Harrosh authored 
      When submitting requests via SG_IO, which does a sync io, a
bsg_command is not allocated. So an in-Kernel sense_buffer was not
set. However when calling blk_execute_rq() with no sense buffer
one is provided from the stack. Now bsg at blk_complete_sgv4_hdr_rq()
would check if rq->sense_len and a sense was requested by sg_io_v4
the rq->sense was copy_user() back, but by now it is already mangled
stack memory.

I have fixed that by forcing a sense_buffer when calling bsg_map_hdr().
The bsg_command->sense is provided in the write/read path like before,
and on-the-stack buffer is provided when doing SG_IO.

I have also fixed a dprintk message to print rq->errors in hex because
of the scsi bit-field use of this member. For other block devices it
does not matter anyway.
Signed-off-by: default avatarBoaz Harrosh <bharrosh@panasas.com>
Acked-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      c1c20120
    • Zlatko Calusic's avatar
      Add support for VT6415 PCIE PATA IDE Host Controller · 5955c7a2
      Zlatko Calusic authored 
      Signed-off-by: default avatarZlatko Calusic <zlatko.calusic@iskon.hr>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5955c7a2
    • Rafael J. Wysocki's avatar
      USB/PCI: Fix resume breakage of controllers behind cardbus bridges · 3494252d
      Rafael J. Wysocki authored 
      If a USB PCI controller is behind a cardbus bridge, we are trying to
restore its configuration registers too early, before the cardbus
bridge is operational.  To fix this, call pci_restore_state() from
usb_hcd_pci_resume() and remove usb_hcd_pci_resume_early() which is
no longer necessary (the configuration spaces of USB controllers that
are not behind cardbus bridges will be restored by the PCI PM core
with interrupts disabled anyway).

This patch fixes the regression from 2.6.28 tracked as
http://bugzilla.kernel.org/show_bug.cgi?id=12659

[ Side note: the proper long-term fix is probably to just force the
  unplug event at suspend time instead of doing a plug/unplug at resume
  time, but this patch is fine regardless  - Linus ]
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Reported-by: default avatarMiles Lane <miles.lane@gmail.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3494252d
  3. 17 Feb, 2009 31 commits
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