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23 October 2021, 00:29:24 UTC
Revision 387125fc722a8ed432066b85a552917343bdafca authored by Chris Mason on 18 November 2011, 20:07:51 UTC, committed by Chris Mason on 20 November 2011, 12:21:14 UTC 
Btrfs: fix barrier flushes
 
When btrfs is writing the super blocks, it send barrier flushes to make
sure writeback caching drives get all the metadata on disk in the
right order.

But, we have two bugs in the way these are sent down.  When doing
full commits (not via the tree log), we are sending the barrier down
before the last super when it should be going down before the first.

In multi-device setups, we should be waiting for the barriers to
complete on all devices before writing any of the supers.

Both of these bugs can cause corruptions on power failures.  We fix it
with some new code to send down empty barriers to all devices before
writing the first super.

Alexandre Oliva found the multi-device bug.  Arne Jansen did the async
barrier loop.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
Reported-by: Alexandre Oliva <oliva@lsd.ic.unicamp.br>
1 parent f1ebcc7
History
Tip revision: 387125fc722a8ed432066b85a552917343bdafca authored by Chris Mason on 18 November 2011, 20:07:51 UTC
Btrfs: fix barrier flushes
Tip revision: 387125f
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.gitignore -rw-r--r-- 1014 bytes
.mailmap -rw-r--r-- 4.1 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 92.6 KB
Kbuild -rw-r--r-- 2.4 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 196.7 KB
Makefile -rw-r--r-- 52.3 KB
README -rw-r--r-- 17.0 KB
REPORTING-BUGS -rw-r--r-- 3.3 KB

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