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authorDave Chinner <dchinner@redhat.com>2013-10-29 22:11:57 +1100
committerBen Myers <bpm@sgi.com>2013-10-30 15:44:51 -0500
commitad22c7a043c2cc6792820e6c5da699935933e87d (patch)
treee129dd4d3d31de48b02feb0378c3677832d6594a /fs/xfs/xfs_aops.c
parent632b89e82bf1c04c251924b49adc689f7b346321 (diff)
downloadop-kernel-dev-ad22c7a043c2cc6792820e6c5da699935933e87d.zip
op-kernel-dev-ad22c7a043c2cc6792820e6c5da699935933e87d.tar.gz
xfs: prevent stack overflows from page cache allocation
Page cache allocation doesn't always go through ->begin_write and hence we don't always get the opportunity to set the allocation context to GFP_NOFS. Failing to do this means we open up the direct relcaim stack to recurse into the filesystem and consume a significant amount of stack. On RHEL6.4 kernels we are seeing ra_submit() and generic_file_splice_read() from an nfsd context recursing into the filesystem via the inode cache shrinker and evicting inodes. This is causing truncation to be run (e.g EOF block freeing) and causing bmap btree block merges and free space btree block splits to occur. These btree manipulations are occurring with the call chain already 30 functions deep and hence there is not enough stack space to complete such operations. To avoid these specific overruns, we need to prevent the page cache allocation from recursing via direct reclaim. We can do that because the allocation functions take the allocation context from that which is stored in the mapping for the inode. We don't set that right now, so the default is GFP_HIGHUSER_MOVABLE, which is effectively a GFP_KERNEL context. We need it to be the equivalent of GFP_NOFS, so when we initialise an inode, set the mapping gfp mask appropriately. This makes the use of AOP_FLAG_NOFS redundant from other parts of the XFS IO path, so get rid of it. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_aops.c')
-rw-r--r--fs/xfs/xfs_aops.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index eb310ca..71c8c9d 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -1572,8 +1572,7 @@ xfs_vm_write_begin(
ASSERT(len <= PAGE_CACHE_SIZE);
- page = grab_cache_page_write_begin(mapping, index,
- flags | AOP_FLAG_NOFS);
+ page = grab_cache_page_write_begin(mapping, index, flags);
if (!page)
return -ENOMEM;
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