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Mike Snitzer ed8b752bcc dm table: set flush capability based on underlying devices 
DM has always advertised both REQ_FLUSH and REQ_FUA flush capabilities
regardless of whether or not a given DM device's underlying devices
also advertised a need for them.

Block's flush-merge changes from 2.6.39 have proven to be more costly
for DM devices.  Performance regressions have been reported even when
DM's underlying devices do not advertise that they have a write cache.

Fix the performance regressions by configuring a DM device's flushing
capabilities based on those of the underlying devices' capabilities.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
 		2011-08-02 12:32:08 +01:00
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Kconfig dm raid: support metadata devices 2011-08-02 12:32:07 +01:00
Makefile
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bitmap.c MD bitmap: Revert DM dirty log hooks 2011-07-27 11:00:37 +10:00
bitmap.h MD bitmap: Revert DM dirty log hooks 2011-07-27 11:00:37 +10:00
dm-bio-record.h
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dm-crypt.c dm crypt: optionally support discard requests 2011-08-02 12:32:08 +01:00
dm-delay.c
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dm-exception-store.c
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dm-exception-store.h
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dm-flakey.c dm flakey: add corrupt_bio_byte feature 2011-08-02 12:32:06 +01:00
dm-io.c dm io: flush cpu cache with vmapped io 2011-08-02 12:32:01 +01:00
dm-ioctl.c dm ioctl: forbid multiple device specifiers 2011-08-02 12:32:06 +01:00
dm-kcopyd.c dm snapshot: skip reading origin when overwriting complete chunk 2011-08-02 12:32:04 +01:00
dm-linear.c
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dm-log-userspace-base.c dm log: userspace use list_move 2011-08-02 12:32:02 +01:00
dm-log-userspace-transfer.c
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dm-log-userspace-transfer.h
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dm-log.c dm: use vzalloc 2011-08-02 12:32:02 +01:00
dm-mpath.c dm table: share target argument parsing functions 2011-08-02 12:32:04 +01:00
dm-mpath.h
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dm-path-selector.c
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dm-path-selector.h
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dm-queue-length.c atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
dm-raid.c dm raid: add md raid1 support 2011-08-02 12:32:07 +01:00
dm-raid1.c dm kcopyd: return client directly and not through a pointer 2011-05-29 13:03:13 +01:00
dm-region-hash.c
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dm-round-robin.c
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dm-service-time.c
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dm-snap-persistent.c dm snapshot: style cleanups 2011-08-02 12:32:03 +01:00
dm-snap-transient.c
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dm-snap.c dm snapshot: skip reading origin when overwriting complete chunk 2011-08-02 12:32:04 +01:00
dm-stripe.c
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dm-sysfs.c
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dm-table.c dm table: set flush capability based on underlying devices 2011-08-02 12:32:08 +01:00
dm-target.c
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dm-uevent.c
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dm-uevent.h
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dm-zero.c
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dm.c dm table: set flush capability based on underlying devices 2011-08-02 12:32:08 +01:00
dm.h dm: ignore merge_bvec for snapshots when safe 2011-08-02 12:32:04 +01:00
faulty.c
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linear.c md,rcu: Convert call_rcu(free_conf) to kfree_rcu() 2011-07-20 11:05:29 -07:00
linear.h
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md.c Merge branch 'for-linus' of git://neil.brown.name/md 2011-07-28 05:50:27 -07:00
md.h md: make it easier to wait for bad blocks to be acknowledged. 2011-07-28 11:31:48 +10:00
multipath.c
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multipath.h
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raid0.c
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raid0.h
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raid1.c md/raid1: factor several functions out or raid1d() 2011-07-28 11:38:13 +10:00
raid1.h md/raid1: Handle write errors by updating badblock log. 2011-07-28 11:32:41 +10:00
raid5.c md/raid5: Clear bad blocks on successful write. 2011-07-28 11:39:23 +10:00
raid5.h md/raid5: Clear bad blocks on successful write. 2011-07-28 11:39:23 +10:00
raid10.c md/raid10: handle further errors during fix_read_error better. 2011-07-28 11:39:25 +10:00
raid10.h md/raid10: Handle write errors by updating badblock log. 2011-07-28 11:39:24 +10:00