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xfs: fallback to vmalloc for large buffers in xfs_getbmap

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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>
This commit is contained in:
Dave Chinner 2012-03-07 04:50:22 +00:00 committed by Ben Myers
parent ad650f5b27
commit f074211f60
1 changed files with 10 additions and 3 deletions
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13
fs/xfs/xfs_bmap.c
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@ -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;
}