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authorDave Chinner <dchinner@redhat.com>2012-03-07 04:50:22 +0000
committerBen Myers <bpm@sgi.com>2012-03-15 14:54:23 -0500
commitf074211f6041305b645669464343d504f4e6a290 (patch)
tree2fd1678c72b47683e25f69e247dfecaec79e477b /fs/xfs
parentad650f5b27bc9858360b42aaa0d9204d16115316 (diff)
xfs: fallback to vmalloc for large buffers in xfs_getbmap
xfs_getbmap uses for a large buffer for extents, which is kmalloc'd. This can fail after the system has been running for some time as it is a high order allocation. Add a fallback to vmalloc so that it doesn't require contiguous memory and so won't randomly fail on files with large extent lists. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_bmap.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index 188ef2fbd62..3548c6f7559 100644
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -5536,8 +5536,12 @@ xfs_getbmap(
if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx))
return XFS_ERROR(ENOMEM);
out = kmem_zalloc(bmv->bmv_count * sizeof(struct getbmapx), KM_MAYFAIL);
- if (!out)
- return XFS_ERROR(ENOMEM);
+ if (!out) {
+ out = kmem_zalloc_large(bmv->bmv_count *
+ sizeof(struct getbmapx));
+ if (!out)
+ return XFS_ERROR(ENOMEM);
+ }
xfs_ilock(ip, XFS_IOLOCK_SHARED);
if (whichfork == XFS_DATA_FORK && !(iflags & BMV_IF_DELALLOC)) {
@@ -5661,7 +5665,10 @@ xfs_getbmap(
break;
}
- kmem_free(out);
+ if (is_vmalloc_addr(out))
+ kmem_free_large(out);
+ else
+ kmem_free(out);
return error;
}