From: J. Bruce Fields Date: Fri, 30 Jun 2006 08:56:19 +0000 (-0700) Subject: [PATCH] knfsd: nfsd: mark rqstp to prevent use of sendfile in privacy case X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5c04c46aec16b3267d8fe03af886f2d41e448cd0;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git [PATCH] knfsd: nfsd: mark rqstp to prevent use of sendfile in privacy case Add a rq_sendfile_ok flag to svc_rqst which will be cleared in the privacy case so that the wrapping code will get copies of the read data instead of real page cache pages. This makes life simpler when we encrypt the response. Signed-off-by: J. Bruce Fields Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 423e1ba0704..e170030d45d 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -837,7 +837,7 @@ nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, if (ra && ra->p_set) file->f_ra = ra->p_ra; - if (file->f_op->sendfile) { + if (file->f_op->sendfile && rqstp->rq_sendfile_ok) { svc_pushback_unused_pages(rqstp); err = file->f_op->sendfile(file, &offset, *count, nfsd_read_actor, rqstp); diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index 50356438454..7b27c09b560 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -159,7 +159,9 @@ struct svc_rqst { * determine what device number * to report (real or virtual) */ - + int rq_sendfile_ok; /* turned off in gss privacy + * to prevent encrypting page + * cache pages */ wait_queue_head_t rq_wait; /* synchronization */ }; diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index b08419e1fc6..fb168a30fd3 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -281,6 +281,8 @@ svc_process(struct svc_serv *serv, struct svc_rqst *rqstp) rqstp->rq_res.page_len = 0; rqstp->rq_res.buflen = PAGE_SIZE; rqstp->rq_res.tail[0].iov_len = 0; + /* Will be turned off only in gss privacy case: */ + rqstp->rq_sendfile_ok = 1; /* tcp needs a space for the record length... */ if (rqstp->rq_prot == IPPROTO_TCP) svc_putu32(resv, 0);