> On Feb 18, 2017, at 9:07 PM, J. Bruce Fields <bfields@xxxxxxxxxx> wrote:
>
> From: Weston Andros Adamson <dros@xxxxxxxxxx>
>
> We're not taking into account that the space needed for the (variable
> length) attr bitmap, with the result that we'd sometimes get a spurious
> ERANGE when the ACL data got close to the end of a page.
>
> Just add in an extra page to make sure.
>
> Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Thanks, you can add:
Signed-off-by: Weston Andros Adamson <dros@xxxxxxxxxxxxxxx>
> ---
> fs/nfs/nfs4proc.c | 8 ++------
> 1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index 0a0eaecf9676..60501e10625d 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -5069,7 +5069,7 @@ static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size
> */
> static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
> {
> - struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
> + struct page *pages[NFS4ACL_MAXPAGES + 1] = {NULL, };
> struct nfs_getaclargs args = {
> .fh = NFS_FH(inode),
> .acl_pages = pages,
> @@ -5083,13 +5083,9 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bu
> .rpc_argp = &args,
> .rpc_resp = &res,
> };
> - unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
> + unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
> int ret = -ENOMEM, i;
>
> - /* As long as we're doing a round trip to the server anyway,
> - * let's be prepared for a page of acl data. */
> - if (npages == 0)
> - npages = 1;
> if (npages > ARRAY_SIZE(pages))
> return -ERANGE;
>
> --
> 2.9.3
>
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