This is a note to let you know that I've just added the patch titled
btrfs: incorrect handling for fiemap_fill_next_extent return
to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-incorrect-handling-for-fiemap_fill_next_extent-return.patch
and it can be found in the queue-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 26e726afe01c1c82072cf23a5ed89ce25f39d9f2 Mon Sep 17 00:00:00 2001
From: Chengyu Song <[email protected]>
Date: Tue, 24 Mar 2015 18:12:56 -0400
Subject: btrfs: incorrect handling for fiemap_fill_next_extent return
From: Chengyu Song <[email protected]>
commit 26e726afe01c1c82072cf23a5ed89ce25f39d9f2 upstream.
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 <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Reviewed-by: Liu Bo <[email protected]>
Signed-off-by: Chris Mason <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/btrfs/extent_io.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4514,8 +4514,11 @@ int extent_fiemap(struct inode *inode, s
}
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);
Patches currently in stable-queue which might be from [email protected] are
queue-4.0/btrfs-incorrect-handling-for-fiemap_fill_next_extent-return.patch
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