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fix for nfsd regression caused by iov_iter stuff this window

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Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull iov_iter fix from Al Viro:
 "Fix for a nfsd regression caused by the iov_iter stuff this window"

* tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  nfsd_splice_actor(): handle compound pages
This commit is contained in:
Linus Torvalds 2022-09-13 15:11:38 +02:00
commit d1221cea11
1 changed files with 7 additions and 3 deletions
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10
fs/nfsd/vfs.c
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@ -845,10 +845,14 @@ nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
struct splice_desc *sd)
{
struct svc_rqst *rqstp = sd->u.data;
struct page *page = buf->page; // may be a compound one
unsigned offset = buf->offset;
svc_rqst_replace_page(rqstp, buf->page);
if (rqstp->rq_res.page_len == 0)
rqstp->rq_res.page_base = buf->offset;
page += offset / PAGE_SIZE;
for (int i = sd->len; i > 0; i -= PAGE_SIZE)
svc_rqst_replace_page(rqstp, page++);
if (rqstp->rq_res.page_len == 0) // first call
rqstp->rq_res.page_base = offset % PAGE_SIZE;
rqstp->rq_res.page_len += sd->len;
return sd->len;
}