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8cbeb67ad5
linux/drivers/md
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Mikulas Patocka 8cbeb67ad5 dm: avoid unsupported spanning of md stripe boundaries 
A bio that has two or more vector entries, size less than or equal to
page size, that crosses a stripe boundary of an underlying md device is
accepted by device mapper (it conforms to all its limits) but not by the
underlying device.

The fix is: If device mapper selects the one-page maximum request size,
it also needs to set its own q->merge_bvec_fn to reject any bios with
multiple vector entries that span more pages.

The problem was discovered in the following scenario:
  * MD - RAID-0
  * LV on the top of it (raid1, snapshot or striped with chunk
size/stripe larger than RAID-0 stripe)
  * one of the logical volumes is exported to xen domU
  * inside xen domU it is partitioned, the key point is that the partition
must be unaligned on page boundary (fdisk normally aligns the partition to
63 sectors which will trigger it)
  * install the system on the partitioned disk in domU
This causes I/O failures in dom0.
Reference: https://bugzilla.redhat.com/show_bug.cgi?id=223947

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2009-06-22 10:12:14 +01:00
..
raid6test md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
.gitignore
bitmap.c Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block 2009-06-11 11:10:35 -07:00
bitmap.h md: move headers out of include/linux/raid/ 2009-03-31 14:27:03 +11:00
dm-bio-record.h dm: preserve bi_io_vec when resubmitting bios 2009-04-02 19:55:23 +01:00
dm-crypt.c dm crypt: use kzfree 2009-04-02 19:55:28 +01:00
dm-delay.c block: move bio list helpers into bio.h 2009-04-15 08:28:09 +02:00
dm-exception-store.c block: Do away with the notion of hardsect_size 2009-05-22 23:22:54 +02:00
dm-exception-store.h block: rename CONFIG_LBD to CONFIG_LBDAF 2009-06-19 08:08:50 +02:00
dm-io.c dm io: make sync_io uninterruptible 2009-04-02 19:55:24 +01:00
dm-ioctl.c Driver Core: misc: add nodename support for misc devices. 2009-06-15 21:30:25 -07:00
dm-kcopyd.c dm kcopyd: fix callback race 2009-04-09 00:27:17 +01:00
dm-linear.c dm: remove limited barrier support 2009-04-09 00:27:13 +01:00
dm-log.c block: Do away with the notion of hardsect_size 2009-05-22 23:22:54 +02:00
dm-mpath.c dm mpath: flush keventd queue in destructor 2009-06-22 10:12:13 +01:00
dm-mpath.h dm mpath: remove is_active from struct dm_path 2008-10-10 13:36:58 +01:00
dm-path-selector.c dm: path selector use module refcount directly 2009-04-02 19:55:27 +01:00
dm-path-selector.h [PATCH] struct path: rename DM's struct path 2006-12-08 08:28:40 -08:00
dm-raid1.c block: move bio list helpers into bio.h 2009-04-15 08:28:09 +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: remove dm header from targets 2008-10-21 17:44:59 +01:00
dm-snap-persistent.c block: Do away with the notion of hardsect_size 2009-05-22 23:22:54 +02:00
dm-snap-transient.c dm snapshot: move status to exception store 2009-04-02 19:55:35 +01:00
dm-snap.c block: move bio list helpers into bio.h 2009-04-15 08:28:09 +02:00
dm-stripe.c dm: consolidate target deregistration error handling 2009-01-06 03:04:58 +00:00
dm-sysfs.c dm: add name and uuid to sysfs 2009-01-06 03:05:12 +00:00
dm-table.c Revert "block: Fix bounce limit setting in DM" 2009-06-09 06:22:57 +02:00
dm-target.c dm target: remove struct tt_internal 2009-04-02 19:55:28 +01:00
dm-uevent.c md: replace remaining __FUNCTION__ occurrences 2008-04-28 08:58:42 -07:00
dm-uevent.h dm: uevent generate events 2007-10-20 02:01:26 +01:00
dm-zero.c dm: consolidate target deregistration error handling 2009-01-06 03:04:58 +00:00
dm.c dm: avoid unsupported spanning of md stripe boundaries 2009-06-22 10:12:14 +01:00
dm.h dm: remove limited barrier support 2009-04-09 00:27:13 +01:00
faulty.c md: Move check for bitmap presence to personality code. 2009-06-18 08:49:23 +10:00
Kconfig md: remove CONFIG_MD_RAID_RESHAPE config option. 2009-03-31 15:27:05 +11:00
linear.c md/linear: use call_rcu to free obsolete 'conf' structures. 2009-06-18 08:49:42 +10:00
linear.h md/linear: use call_rcu to free obsolete 'conf' structures. 2009-06-18 08:49:42 +10:00
Makefile md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
md.c md: Move check for bitmap presence to personality code. 2009-06-18 08:49:23 +10:00
md.h md: Move check for bitmap presence to personality code. 2009-06-18 08:49:23 +10:00
mktables.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
multipath.c md: Move check for bitmap presence to personality code. 2009-06-18 08:49:23 +10:00
multipath.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid0.c md: Move check for bitmap presence to personality code. 2009-06-18 08:49:23 +10:00
raid0.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid1.c md: Push down reconstruction log message to personality code. 2009-06-18 08:48:06 +10:00
raid1.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
raid5.c md/raid5: correctly update sync_completed when we reach max_resync 2009-06-18 09:14:12 +10:00
raid5.h md: convert conf->chunk_size and conf->prev_chunk to sectors. 2009-06-18 08:45:55 +10:00
raid6algos.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6altivec.uc md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6int.uc md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6mmx.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6recov.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6sse1.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6sse2.c md/raid6: move raid6 data processing to raid6_pq.ko 2009-03-31 15:09:39 +11:00
raid6x86.h md: fix typo in FSF address 2009-03-31 14:57:37 +11:00
raid10.c md: Push down reconstruction log message to personality code. 2009-06-18 08:48:06 +10:00
raid10.h md: remove mddev_to_conf "helper" macro 2009-06-16 16:54:21 +10:00
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