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| author | Chuck Lever <chuck.lever@oracle.com> | 2021-01-31 22:16:23 +0100 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2021-02-01 16:03:51 +0100 |
| commit | bad4c6eb5eaa8300e065bd4426727db5141d687d (patch) | |
| tree | d3958632fdd4fd7cc2e3290800286ecc55e0b52d /net/sunrpc/svcsock.c | |
| parent | Linux 5.11-rc6 (diff) | |
| download | linux-bad4c6eb5eaa8300e065bd4426727db5141d687d.tar.xz linux-bad4c6eb5eaa8300e065bd4426727db5141d687d.zip | |
SUNRPC: Fix NFS READs that start at non-page-aligned offsets
Anj Duvnjak reports that the Kodi.tv NFS client is not able to read
video files from a v5.10.11 Linux NFS server.
The new sendpage-based TCP sendto logic was not attentive to non-
zero page_base values. nfsd_splice_read() sets that field when a
READ payload starts in the middle of a page.
The Linux NFS client rarely emits an NFS READ that is not page-
aligned. All of my testing so far has been with Linux clients, so I
missed this one.
Reported-by: A. Duvnjak <avian@extremenerds.net>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=211471
Fixes: 4a85a6a3320b ("SUNRPC: Handle TCP socket sends with kernel_sendpage() again")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: A. Duvnjak <avian@extremenerds.net>
Diffstat (limited to 'net/sunrpc/svcsock.c')
| -rw-r--r-- | net/sunrpc/svcsock.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index c9766d07eb81..5a809c64dc7b 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -1113,14 +1113,15 @@ static int svc_tcp_sendmsg(struct socket *sock, struct msghdr *msg, unsigned int offset, len, remaining; struct bio_vec *bvec; - bvec = xdr->bvec; - offset = xdr->page_base; + bvec = xdr->bvec + (xdr->page_base >> PAGE_SHIFT); + offset = offset_in_page(xdr->page_base); remaining = xdr->page_len; flags = MSG_MORE | MSG_SENDPAGE_NOTLAST; while (remaining > 0) { if (remaining <= PAGE_SIZE && tail->iov_len == 0) flags = 0; - len = min(remaining, bvec->bv_len); + + len = min(remaining, bvec->bv_len - offset); ret = kernel_sendpage(sock, bvec->bv_page, bvec->bv_offset + offset, len, flags); |