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| author | Neil Brown <neilb@notabene.brown> | 2008-07-03 02:45:35 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-07-24 09:14:03 -0700 |
| commit | e116ec2ae0acf03d52459afeed259a449112b2b2 (patch) | |
| tree | 38eb8eca81dd99d8030289fd6f26adf24e92d541 | |
| parent | 583fe2db21978453aa522f56320f15b2de0d9d88 (diff) | |
| download | lwn-e116ec2ae0acf03d52459afeed259a449112b2b2.tar.gz lwn-e116ec2ae0acf03d52459afeed259a449112b2b2.zip | |
md: Don't acknowlege that stripe-expand is complete until it really is.
commit efe311431869b40d67911820a309f9a1a41306f3 upstream
We shouldn't acknowledge that a stripe has been expanded (When
reshaping a raid5 by adding a device) until the moved data has
actually been written out. However we are currently
acknowledging (by calling md_done_sync) when the POST_XOR
is complete and before the write.
So track in s.locked whether there are pending writes, and don't
call md_done_sync yet if there are.
Note: we all set R5_LOCKED on devices which are are about to
read from. This probably isn't technically necessary, but is
usually done when writing a block, and justifies the use of
s.locked here.
This bug can lead to a crash if an array is stopped while an reshape
is in progress.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/md/raid5.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 705fe473c694..61cbdc6e2012 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2861,6 +2861,8 @@ static void handle_stripe5(struct stripe_head *sh) for (i = conf->raid_disks; i--; ) { set_bit(R5_Wantwrite, &sh->dev[i].flags); + set_bit(R5_LOCKED, &dev->flags); + s.locked++; if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending)) sh->ops.count++; } @@ -2874,6 +2876,7 @@ static void handle_stripe5(struct stripe_head *sh) conf->raid_disks); s.locked += handle_write_operations5(sh, 1, 1); } else if (s.expanded && + s.locked == 0 && !test_bit(STRIPE_OP_POSTXOR, &sh->ops.pending)) { clear_bit(STRIPE_EXPAND_READY, &sh->state); atomic_dec(&conf->reshape_stripes); |