Btrfs: fix race in sync and freeze again

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I screwed this up, there is a race between checking if there is a running
transaction and actually starting a transaction in sync where we could race
with a freezer and get ourselves into trouble.  To fix this we need to make
a new join type to only do the try lock on the freeze stuff.  If it fails
we'll return EPERM and just return from sync.  This fixes a hang Liu Bo
reported when running xfstest 68 in a loop.  Thanks,

Reported-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

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This commit is contained in:

Josef Bacik 2012-09-14 10:34:40 -04:00 • committed by Chris Mason

parent b3ae244e71

commit 60376ce4a8

3 changed files with 18 additions and 10 deletions

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15

fs/btrfs/super.c

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12

fs/btrfs/transaction.c

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1

fs/btrfs/transaction.h

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