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Btrfs: fix EIO on reading file after ioctl clone works on it

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For inline data extent, we need to make its length aligned, otherwise,
we can get a phantom extent map which confuses readpages() to return -EIO.

This can be detected by xfstests/btrfs/035.

Reported-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Liu Bo 2014-05-09 10:01:02 +08:00 committed by Chris Mason
parent cfd4a535b6
commit d3ecfcdf91
1 changed files with 5 additions and 1 deletions
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6
fs/btrfs/ioctl.c
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@ -3142,6 +3142,8 @@ process_slot:
} else if (type == BTRFS_FILE_EXTENT_INLINE) {
u64 skip = 0;
u64 trim = 0;
u64 aligned_end = 0;
if (off > key.offset) {
skip = off - key.offset;
new_key.offset += skip;
@ -3158,9 +3160,11 @@ process_slot:
size -= skip + trim;
datal -= skip + trim;
aligned_end = ALIGN(new_key.offset + datal,
root->sectorsize);
ret = btrfs_drop_extents(trans, root, inode,
new_key.offset,
new_key.offset + datal,
aligned_end,
1);
if (ret) {
if (ret != -EOPNOTSUPP)