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| author | Dave Chinner <dchinner@redhat.com> | 2012-03-07 04:50:22 +0000 |
|---|---|---|
| committer | Ben Myers <bpm@sgi.com> | 2012-03-15 14:54:23 -0500 |
| commit | f074211f6041305b645669464343d504f4e6a290 (patch) | |
| tree | 2fd1678c72b47683e25f69e247dfecaec79e477b | |
| parent | ad650f5b27bc9858360b42aaa0d9204d16115316 (diff) | |
| download | linux-f074211f6041305b645669464343d504f4e6a290.tar.gz linux-f074211f6041305b645669464343d504f4e6a290.tar.bz2 linux-f074211f6041305b645669464343d504f4e6a290.zip | |
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>
| -rw-r--r-- | fs/xfs/xfs_bmap.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c index 188ef2fbd628..3548c6f75593 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; } |