ocfs2: Fix possible deadlock when extending quota file

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In OCFS2, allocator locks rank above transaction start. Thus we
cannot extend quota file from inside a transaction less we could
deadlock.

We solve the problem by starting transaction not already in
ocfs2_acquire_dquot() but only in ocfs2_local_read_dquot() and
ocfs2_global_read_dquot() and we allocate blocks to quota files before starting
the transaction.  In case we crash, quota files will just have a few blocks
more but that's no problem since we just use them next time we extend the
quota file.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Joel Becker <joel.becker@oracle.com>

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This commit is contained in:

Jan Kara 2009-08-06 23:29:34 +02:00 • committed by Joel Becker

parent 8a57a9dda7

commit b409d7a0ab

2 changed files with 57 additions and 63 deletions

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5

fs/ocfs2/journal.h

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115

fs/ocfs2/quota_global.c

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