From: Chengyu Song <csong84@xxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 26e726afe01c1c82072cf23a5ed89ce25f39d9f2 ]
fiemap_fill_next_extent returns 0 on success, -errno on error, 1 if this was
the last extent that will fit in user array. If 1 is returned, the return
value may eventually returned to user space, which should not happen, according
to manpage of ioctl.
Signed-off-by: Chengyu Song <csong84@xxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxx>
Reviewed-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
fs/btrfs/extent_io.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index bf3f424..02391f3 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4484,8 +4484,11 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
}
ret = fiemap_fill_next_extent(fieinfo, em_start, disko,
em_len, flags);
- if (ret)
+ if (ret) {
+ if (ret == 1)
+ ret = 0;
goto out_free;
+ }
}
out_free:
free_extent_map(em);
--
2.1.4
--
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