linux-stable.git/include/linux/blk_types.h, branch v3.10.78

Defer processing of REQ_PREEMPT requests for blocked devices

2015-04-19T08:10:49+00:00

commit bba0bdd7ad4713d82338bcd9b72d57e9335a664b upstream.

SCSI transport drivers and SCSI LLDs block a SCSI device if the
transport layer is not operational. This means that in this state
no requests should be processed, even if the REQ_PREEMPT flag has
been set. This patch avoids that a rescan shortly after a cable
pull sporadically triggers the following kernel oops:

BUG: unable to handle kernel paging request at ffffc9001a6bc084
IP: [] mlx4_ib_post_send+0xd2/0xb30 [mlx4_ib]
Process rescan-scsi-bus (pid: 9241, threadinfo ffff88053484a000, task ffff880534aae100)
Call Trace:
 [] srp_post_send+0x65/0x70 [ib_srp]
 [] srp_queuecommand+0x1cf/0x3e0 [ib_srp]
 [] scsi_dispatch_cmd+0x101/0x280 [scsi_mod]
 [] scsi_request_fn+0x411/0x4d0 [scsi_mod]
 [] __blk_run_queue+0x27/0x30
 [] blk_execute_rq_nowait+0x82/0x110
 [] blk_execute_rq+0x62/0xf0
 [] scsi_execute+0xe8/0x190 [scsi_mod]
 [] scsi_execute_req+0xa3/0x130 [scsi_mod]
 [] scsi_probe_lun+0x17a/0x450 [scsi_mod]
 [] scsi_probe_and_add_lun+0x156/0x480 [scsi_mod]
 [] __scsi_scan_target+0xdf/0x1f0 [scsi_mod]
 [] scsi_scan_host_selected+0x183/0x1c0 [scsi_mod]
 [] scsi_scan+0xdb/0xe0 [scsi_mod]
 [] store_scan+0x13/0x20 [scsi_mod]
 [] sysfs_write_file+0xcb/0x160
 [] vfs_write+0xce/0x140
 [] sys_write+0x53/0xa0
 [] system_call_fastpath+0x16/0x1b
 [<00007f611c9d9300>] 0x7f611c9d92ff

Reported-by: Max Gurtuvoy 
Signed-off-by: Bart Van Assche 
Reviewed-by: Mike Christie 
Signed-off-by: James Bottomley 
Signed-off-by: Greg Kroah-Hartman

Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block

2013-05-08T17:13:35+00:00

Pull block core updates from Jens Axboe:

 - Major bit is Kents prep work for immutable bio vecs.

 - Stable candidate fix for a scheduling-while-atomic in the queue
   bypass operation.

 - Fix for the hang on exceeded rq->datalen 32-bit unsigned when merging
   discard bios.

 - Tejuns changes to convert the writeback thread pool to the generic
   workqueue mechanism.

 - Runtime PM framework, SCSI patches exists on top of these in James'
   tree.

 - A few random fixes.

* 'for-3.10/core' of git://git.kernel.dk/linux-block: (40 commits)
  relay: move remove_buf_file inside relay_close_buf
  partitions/efi.c: replace useless kzalloc's by kmalloc's
  fs/block_dev.c: fix iov_shorten() criteria in blkdev_aio_read()
  block: fix max discard sectors limit
  blkcg: fix "scheduling while atomic" in blk_queue_bypass_start
  Documentation: cfq-iosched: update documentation help for cfq tunables
  writeback: expose the bdi_wq workqueue
  writeback: replace custom worker pool implementation with unbound workqueue
  writeback: remove unused bdi_pending_list
  aoe: Fix unitialized var usage
  bio-integrity: Add explicit field for owner of bip_buf
  block: Add an explicit bio flag for bios that own their bvec
  block: Add bio_alloc_pages()
  block: Convert some code to bio_for_each_segment_all()
  block: Add bio_for_each_segment_all()
  bounce: Refactor __blk_queue_bounce to not use bi_io_vec
  raid1: use bio_copy_data()
  pktcdvd: Use bio_reset() in disabled code to kill bi_idx usage
  pktcdvd: use bio_copy_data()
  block: Add bio_copy_data()
  ...

mm: make snapshotting pages for stable writes a per-bio operation

2013-04-29T22:54:33+00:00

Walking a bio's page mappings has proved problematic, so create a new
bio flag to indicate that a bio's data needs to be snapshotted in order
to guarantee stable pages during writeback.  Next, for the one user
(ext3/jbd) of snapshotting, hook all the places where writes can be
initiated without PG_writeback set, and set BIO_SNAP_STABLE there.

We must also flag journal "metadata" bios for stable writeout, since
file data can be written through the journal.  Finally, the
MS_SNAP_STABLE mount flag (only used by ext3) is now superfluous, so get
rid of it.

[akpm@linux-foundation.org: rename _submit_bh()'s `flags' to `bio_flags', delobotomize the _submit_bh declaration]
[akpm@linux-foundation.org: teeny cleanup]
Signed-off-by: Darrick J. Wong 
Cc: Andy Lutomirski 
Cc: Adrian Hunter 
Cc: Artem Bityutskiy 
Reviewed-by: Jan Kara 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'for-jens' of http://evilpiepirate.org/git/linux-bcache into for-3.10/core

2013-03-25T03:38:59+00:00

This contains Kents prep work for the immutable bio_vecs.

block: Add an explicit bio flag for bios that own their bvec

2013-03-23T21:26:33+00:00

This is for the new bio splitting code. When we split a bio, if the
split occured on a bvec boundry we reuse the bvec for the new bio. But
that means bio_free() can't free it, hence the explicit flag.

Signed-off-by: Kent Overstreet 
CC: Jens Axboe 
Acked-by: Tejun Heo

block: Add bio_advance()

2013-03-23T21:15:27+00:00

This is prep work for immutable bio vecs; we first want to centralize
where bvecs are modified.

Next two patches convert some existing code to use this function.

Signed-off-by: Kent Overstreet 
CC: Jens Axboe

block: add a flag to identify PM request

2013-03-23T04:22:15+00:00

Add a flag REQ_PM to identify the request is PM related, such requests
will not change the device request queue's runtime status. It is
intended to be used in driver's runtime PM callback, so that driver can
perform some IO to the device there with the queue's runtime status
unaffected. e.g. in SCSI disk's runtime suspend callback, the disk will
be put into stopped power state, and this require sending a command to
the device. Such command processing should not change the disk's runtime
status.

Signed-off-by: Lin Ming 
Signed-off-by: Aaron Lu 
Acked-by: Alan Stern 
Signed-off-by: Jens Axboe

block: Implement support for WRITE SAME

2012-09-20T12:31:45+00:00

The WRITE SAME command supported on some SCSI devices allows the same
block to be efficiently replicated throughout a block range. Only a
single logical block is transferred from the host and the storage device
writes the same data to all blocks described by the I/O.

This patch implements support for WRITE SAME in the block layer. The
blkdev_issue_write_same() function can be used by filesystems and block
drivers to replicate a buffer across a block range. This can be used to
efficiently initialize software RAID devices, etc.

Signed-off-by: Martin K. Petersen 
Acked-by: Mike Snitzer 
Signed-off-by: Jens Axboe

block: Clean up special command handling logic

2012-09-20T12:31:38+00:00

Remove special-casing of non-rw fs style requests (discard). The nomerge
flags are consolidated in blk_types.h, and rq_mergeable() and
bio_mergeable() have been modified to use them.

bio_is_rw() is used in place of bio_has_data() a few places. This is
done to to distinguish true reads and writes from other fs type requests
that carry a payload (e.g. write same).

Signed-off-by: Martin K. Petersen 
Acked-by: Mike Snitzer 
Signed-off-by: Jens Axboe

block: Kill bi_destructor

2012-09-09T08:35:39+00:00

Now that we've got generic code for freeing bios allocated from bio
pools, this isn't needed anymore.

This patch also makes bio_free() static, since without bi_destructor
there should be no need for it to be called anywhere else.

bio_free() is now only called from bio_put, so we can refactor those a
bit - move some code from bio_put() to bio_free() and kill the redundant
bio->bi_next = NULL.

v5: Switch to BIO_KMALLOC_POOL ((void *)~0), per Boaz
v6: BIO_KMALLOC_POOL now NULL, drop bio_free's EXPORT_SYMBOL
v7: No #define BIO_KMALLOC_POOL anymore

Signed-off-by: Kent Overstreet 
CC: Jens Axboe 
Signed-off-by: Jens Axboe