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f1e5398746
kernel-ark/drivers/md
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Mikulas Patocka f1e5398746 dm io: remove extra bi_io_vec region hack 
Remove the hack where we allocate an extra bi_io_vec to store additional
private data.  This hack prevents us from supporting barriers in
dm-raid1 without first making another little block layer change.
Instead of doing that, this patch eliminates the bi_io_vec abuse by
storing the region number directly in the low bits of bi_private.

We need to store two things for each bio, the pointer to the main io
structure and, if parallel writes were requested, an index indicating
which of these writes this bio belongs to.  There can be at most
BITS_PER_LONG regions - 32 or 64.

The index (region number) was stored in the last (hidden) bio vector and
the pointer to struct io was stored in bi_private.

This patch now aligns "struct io" on BITS_PER_LONG bytes and stores the
region number in the low BITS_PER_LONG bits of bi_private.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2009-12-10 23:51:58 +00:00
..
raid6test md: drivers/md/unroll.pl replaced with awk analog 2009-10-16 16:25:19 +11:00
.gitignore
bitmap.c md: remove clumsy usage of do_sync_mapping_range from bitmap code 2009-10-16 15:56:01 +11:00
bitmap.h
dm-bio-record.h
dm-crypt.c dm crypt: make wipe message also wipe essiv key 2009-12-10 23:51:57 +00:00
dm-delay.c dm table: pass correct dev area size to device_area_is_valid 2009-07-23 20:30:42 +01:00
dm-exception-store.c dm exception store: free tmp_store on persistent flag error 2009-12-10 23:51:52 +00:00
dm-exception-store.h dm snapshot: use unsigned integer chunk size 2009-10-16 23:18:17 +01:00
dm-io.c dm io: remove extra bi_io_vec region hack 2009-12-10 23:51:58 +00:00
dm-ioctl.c dm: avoid _hash_lock deadlock 2009-12-10 23:51:52 +00:00
dm-kcopyd.c
dm-linear.c dm table: pass correct dev area size to device_area_is_valid 2009-07-23 20:30:42 +01:00
dm-log-userspace-base.c dm log: userspace fix incorrect luid cast in userspace_ctr 2009-10-16 23:18:15 +01:00
dm-log-userspace-transfer.c dm/connector: Only process connector packages from privileged processes 2009-10-02 10:54:10 -07:00
dm-log-userspace-transfer.h dm log: userspace add luid to distinguish between concurrent log instances 2009-09-04 20:40:34 +01:00
dm-log.c dm log: fix create_log_context to use logical_block_size of log device 2009-06-22 10:12:33 +01:00
dm-mpath.c [SCSI] scsi_dh: Change the scsidh_activate interface to be asynchronous 2009-12-04 12:00:46 -06:00
dm-mpath.h
dm-path-selector.c
dm-path-selector.h dm mpath: add start_io and nr_bytes to path selectors 2009-06-22 10:12:27 +01:00
dm-queue-length.c dm mpath: add queue length load balancer 2009-06-22 10:12:27 +01:00
dm-raid1.c bio: first step in sanitizing the bio->bi_rw flag testing 2009-09-11 14:33:31 +02:00
dm-region-hash.c dm raid1: keep retrying alloc if mempool_alloc failed 2009-06-22 10:12:13 +01:00
dm-round-robin.c dm mpath: add start_io and nr_bytes to path selectors 2009-06-22 10:12:27 +01:00
dm-service-time.c dm mpath: add service time load balancer 2009-06-22 10:12:28 +01:00
dm-snap-persistent.c dm snapshot: use unsigned integer chunk size 2009-10-16 23:18:17 +01:00
dm-snap-transient.c
dm-snap.c dm snapshot: cope with chunk size larger than origin 2009-12-10 23:51:54 +00:00
dm-stripe.c block: Optimal I/O limit wrapper 2009-09-14 08:24:52 +02:00
dm-sysfs.c dm: sysfs add empty release function to avoid debug warning 2009-12-10 23:51:53 +00:00
dm-table.c dm stripe: expose correct io hints 2009-09-04 20:40:25 +01:00
dm-target.c
dm-uevent.c dm: avoid _hash_lock deadlock 2009-12-10 23:51:52 +00:00
dm-uevent.h
dm-zero.c
dm.c dm io: use slab for struct io 2009-12-10 23:51:57 +00:00
dm.h dm io: use slab for struct io 2009-12-10 23:51:57 +00:00
faulty.c md: Move check for bitmap presence to personality code. 2009-06-18 08:49:23 +10:00
Kconfig Merge branch 'dmaengine' into async-tx-next 2009-09-08 17:55:21 -07:00
linear.c md: report device as congested when suspended 2009-09-23 18:10:29 +10:00
linear.h md/linear: use call_rcu to free obsolete 'conf' structures. 2009-06-18 08:49:42 +10:00
Makefile md: drivers/md/unroll.pl replaced with awk analog 2009-10-16 16:25:19 +11:00
md.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/sysctl-2.6 2009-12-08 07:38:50 -08:00
md.h md: report device as congested when suspended 2009-09-23 18:10:29 +10:00
mktables.c
multipath.c md: remove unnecessary memset from multipath. 2009-09-23 18:16:31 +10:00
multipath.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid0.c md: report device as congested when suspended 2009-09-23 18:10:29 +10:00
raid0.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid1.c md: revert incorrect fix for read error handling in raid1. 2009-12-01 17:30:59 +11:00
raid1.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid5.c md/raid5: Allow dirty-degraded arrays to be assembled when only party is degraded. 2009-11-13 17:47:00 +11:00
raid5.h md: fix problems with RAID6 calculations for DDF. 2009-10-16 16:27:34 +11:00
raid6algos.c
raid6altivec.uc md: drivers/md/unroll.pl replaced with awk analog 2009-10-16 16:25:19 +11:00
raid6int.uc md: drivers/md/unroll.pl replaced with awk analog 2009-10-16 16:25:19 +11:00
raid6mmx.c
raid6recov.c
raid6sse1.c
raid6sse2.c
raid6x86.h
raid10.c md: raid1/raid10: handle allocation errors during array setup. 2009-10-16 15:55:44 +11:00
raid10.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
unroll.awk md: drivers/md/unroll.pl replaced with awk analog 2009-10-16 16:25:19 +11:00