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authorDave Chinner <dchinner@redhat.com>2012-03-07 04:50:21 +0000
committerBen Myers <bpm@sgi.com>2012-03-15 14:14:33 -0500
commitad650f5b27bc9858360b42aaa0d9204d16115316 (patch)
tree9f21fe0fe1589c7cbcbc422f7d4ffcc4cf57bb74 /fs/xfs/xfs_ioctl.c
parent6eb2466036358078aed9a65d702cbc97baf0ce65 (diff)
xfs: fallback to vmalloc for large buffers in xfs_attrmulti_attr_get
xfsdump uses for a large buffer for extended attributes, which has a kmalloc'd shadow buffer in the kernel. 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 while xfsdump is running. 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/xfs_ioctl.c')
-rw-r--r--fs/xfs/xfs_ioctl.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 76f3ca5cfc3..f588320dc4b 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -450,9 +450,12 @@ xfs_attrmulti_attr_get(
if (*len > XATTR_SIZE_MAX)
return EINVAL;
- kbuf = kmalloc(*len, GFP_KERNEL);
- if (!kbuf)
- return ENOMEM;
+ kbuf = kmem_zalloc(*len, KM_SLEEP | KM_MAYFAIL);
+ if (!kbuf) {
+ kbuf = kmem_zalloc_large(*len);
+ if (!kbuf)
+ return ENOMEM;
+ }
error = xfs_attr_get(XFS_I(inode), name, kbuf, (int *)len, flags);
if (error)
@@ -462,7 +465,10 @@ xfs_attrmulti_attr_get(
error = EFAULT;
out_kfree:
- kfree(kbuf);
+ if (is_vmalloc_addr(kbuf))
+ kmem_free_large(kbuf);
+ else
+ kmem_free(kbuf);
return error;
}