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[XFS] Use KM_NOFS for debug trace buffers

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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>
This commit is contained in:
Lachlan McIlroy
2008-08-13 16:51:57 +10:00
committed by Lachlan McIlroy
parent d62c251fe4
commit 5695ef46ef
6 changed files with 11 additions and 11 deletions
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2
fs/xfs/xfs_filestream.c
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@ -400,7 +400,7 @@ xfs_filestream_init(void)
if (!item_zone)
return -ENOMEM;
#ifdef XFS_FILESTREAMS_TRACE
xfs_filestreams_trace_buf = ktrace_alloc(XFS_FSTRM_KTRACE_SIZE, KM_SLEEP);
xfs_filestreams_trace_buf = ktrace_alloc(XFS_FSTRM_KTRACE_SIZE, KM_NOFS);
#endif
return 0;
}