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btrfs: check file extent backref offset underflow

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Offset field in data extent backref can underflow if clone range ioctl
is used. We can reliably detect the underflow because max file size is
limited to 2^63 and max data extent size is limited by block group size.

Signed-off-by: Zheng Yan  <zheng.z.yan@intel.com>
This commit is contained in:
Yan, Zheng 2011-08-29 09:25:53 +08:00 committed by David Sterba
parent 016fc6a63e
commit 84850e8d8a
1 changed files with 4 additions and 1 deletions
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5
fs/btrfs/relocation.c
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@ -3322,8 +3322,11 @@ static int find_data_references(struct reloc_control *rc,
}
key.objectid = ref_objectid;
key.offset = ref_offset;
key.type = BTRFS_EXTENT_DATA_KEY;
if (ref_offset > ((u64)-1 << 32))
key.offset = 0;
else
key.offset = ref_offset;
path->search_commit_root = 1;
path->skip_locking = 1;