On Tue, Aug 23, 2016 at 05:54:13PM +0200, Artem Savkov wrote:
> Commit "xfs: only return -errno or success from attr ->put_listent" changes the
Please quote commits in --oneline format in changelogs - it makes it
much easier to find the change you are refering to if there is both
a commit ID and the text string in the commit message. (i.e. text
string confirms the commit id is the one you meant to quote).
commit 2a6fba6 ("xfs: only return -errno or success from attr
->put_listent") is the one you are refering to here, right?
> returnvalue of __xfs_xattr_put_listen to 0 in case when there is insufficient
> space in the buffer assuming that setting context->count to -1 would be enough,
> but all of the ->put_listent callers only check seen_enough. This results in
> a failed assertion:
> XFS: Assertion failed: context->count >= 0, file: fs/xfs/xfs_xattr.c, line: 175
> in insufficient buffer size case.
You have a test case? Can you turn it into an xfstest? We really
need regression tests that cover issues like this....
> Signed-off-by: Artem Savkov <asavkov@xxxxxxxxxx>
> ---
> fs/xfs/xfs_xattr.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
> index ea62245..6290093 100644
> --- a/fs/xfs/xfs_xattr.c
> +++ b/fs/xfs/xfs_xattr.c
> @@ -147,6 +147,7 @@ __xfs_xattr_put_listent(
> arraytop = context->count + prefix_len + namelen + 1;
> if (arraytop > context->firstu) {
> context->count = -1; /* insufficient space */
> + context->seen_enough = 1;
> return 0;
> }
> offset = (char *)context->alist + context->count;
Looks sane, though I don't know how to test it yet....
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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