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xfs: fix might_sleep() warning when initialising per-ag tree 

The use of radix_tree_preload() only works if the radix tree was
initialised without the __GFP_WAIT flag. The per-ag tree uses
GFP_NOFS, so does not trigger allocation of new tree nodes from the
preloaded array. Hence it enters the allocator with a spinlock held
and triggers the might_sleep() warnings.

Reported-by; Chris Mason <chris.mason@oracle.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2010-05-27 01:58:13 +00:00 committed by Alex Elder
parent 38e712ab3d
commit 9b98b6f3e1
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_mount.c
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@ -1254,7 +1254,7 @@ xfs_mountfs(
* Allocate and initialize the per-ag data.
*/
spin_lock_init(&mp->m_perag_lock);
INIT_RADIX_TREE(&mp->m_perag_tree, GFP_NOFS);
INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi);
if (error) {
cmn_err(CE_WARN, "XFS: Failed per-ag init: %d", error);