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authorLachlan McIlroy <lachlan@sgi.com>2008-08-13 02:51:57 -0400
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-08-13 02:51:57 -0400
commit5695ef46ef02ba1c6658daa46e6879a2d4f52f5f (patch)
tree885687ac9cdbba4717f01eef26195fd4eef2ee90 /fs/xfs/xfs_filestream.c
parentd62c251fe4a06144255291cffd68cbadf3bf002f (diff)
[XFS] Use KM_NOFS for debug trace buffers
Use KM_NOFS to prevent recursion back into the filesystem which can cause deadlocks. In the case of xfs_iread() we hold the lock on the inode cluster buffer while allocating memory for the trace buffers. If we recurse back into XFS to flush data that may require a transaction to allocate extents which needs log space. This can deadlock with the xfsaild thread which can't push the tail of the log because it is trying to get the inode cluster buffer lock. SGI-PV: 981498 SGI-Modid: xfs-linux-melb:xfs-kern:31838a Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: David Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_filestream.c')
-rw-r--r--fs/xfs/xfs_filestream.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/xfs/xfs_filestream.c b/fs/xfs/xfs_filestream.c
index c38fd14fca29..f3bb75da384e 100644
--- a/fs/xfs/xfs_filestream.c
+++ b/fs/xfs/xfs_filestream.c
@@ -400,7 +400,7 @@ xfs_filestream_init(void)
400 if (!item_zone) 400 if (!item_zone)
401 return -ENOMEM; 401 return -ENOMEM;
402#ifdef XFS_FILESTREAMS_TRACE 402#ifdef XFS_FILESTREAMS_TRACE
403 xfs_filestreams_trace_buf = ktrace_alloc(XFS_FSTRM_KTRACE_SIZE, KM_SLEEP); 403 xfs_filestreams_trace_buf = ktrace_alloc(XFS_FSTRM_KTRACE_SIZE, KM_NOFS);
404#endif 404#endif
405 return 0; 405 return 0;
406} 406}