tree ac01d872ec2f654e2c305485e79e95d05ccb0c27
parent 3f52c2f0a07c23771909cc53f2e9451a7f1bf253
author Christoph Hellwig <hch@infradead.org> 1247955298 -0400
committer Felix Blyakher <felixb@sgi.com> 1250057258 -0500

xfs: switch to NOFS allocation under i_lock in xfs_buf_associate_memory

xfs_buf_associate_memory is used for setting up the spare buffer for the
log wrap case in xlog_sync which can happen under i_lock when called from
xfs_fsync. The i_lock mutex is taken in reclaim context so all allocations
under it must avoid recursions into the filesystem.  There are a couple
more uses of xfs_buf_associate_memory in the log recovery code that are
also affected by this, but I'd rather keep the code simple than passing on
a gfp_mask argument.  Longer term we should just stop requiring the memoery
allocation in xlog_sync by some smaller rework of the buffer layer.

Reported by the new reclaim context tracing in lockdep.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Felix Blyakher <felixb@sgi.com>
Signed-off-by: Felix Blyakher <felixb@sgi.com>