From 4452435948424e5322c2a2fefbdc2cf3732cc45d Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Wed, 4 Oct 2006 02:15:46 -0700 Subject: [PATCH] [PATCH] knfsd: Replace two page lists in struct svc_rqst with one We are planning to increase RPCSVC_MAXPAGES from about 8 to about 256. This means we need to be a bit careful about arrays of size RPCSVC_MAXPAGES. struct svc_rqst contains two such arrays. However the there are never more that RPCSVC_MAXPAGES pages in the two arrays together, so only one array is needed. The two arrays are for the pages holding the request, and the pages holding the reply. Instead of two arrays, we can simply keep an index into where the first reply page is. This patch also removes a number of small inline functions that probably server to obscure what is going on rather than clarify it, and opencode the needed functionality. Also remove the 'rq_restailpage' variable as it is *always* 0. i.e. if the response 'xdr' structure has a non-empty tail it is always in the same pages as the head. check counters are initilised and incr properly check for consistant usage of ++ etc maybe extra some inlines for common approach general review Signed-off-by: Neil Brown Cc: Magnus Maatta Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/nfsd/nfs2acl.c | 2 +- fs/nfsd/nfs3acl.c | 2 +- fs/nfsd/nfs3xdr.c | 23 ++++------- fs/nfsd/nfs4xdr.c | 27 ++++++------ fs/nfsd/nfsxdr.c | 13 ++---- fs/nfsd/vfs.c | 16 ++++--- include/linux/sunrpc/svc.h | 69 +++++-------------------------- net/sunrpc/auth_gss/svcauth_gss.c | 4 +- net/sunrpc/svc.c | 21 ++++------ net/sunrpc/svcsock.c | 41 +++++++++--------- 10 files changed, 77 insertions(+), 141 deletions(-) diff --git a/fs/nfsd/nfs2acl.c b/fs/nfsd/nfs2acl.c index fe56b38364c..71108da2e54 100644 --- a/fs/nfsd/nfs2acl.c +++ b/fs/nfsd/nfs2acl.c @@ -241,7 +241,7 @@ static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, u32 *p, rqstp->rq_res.page_len = w; while (w > 0) { - if (!svc_take_res_page(rqstp)) + if (!rqstp->rq_respages[rqstp->rq_resused++]) return 0; w -= PAGE_SIZE; } diff --git a/fs/nfsd/nfs3acl.c b/fs/nfsd/nfs3acl.c index 16e10c170ae..f813b054f4a 100644 --- a/fs/nfsd/nfs3acl.c +++ b/fs/nfsd/nfs3acl.c @@ -185,7 +185,7 @@ static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, u32 *p, rqstp->rq_res.page_len = w; while (w > 0) { - if (!svc_take_res_page(rqstp)) + if (!rqstp->rq_respages[rqstp->rq_resused++]) return 0; w -= PAGE_SIZE; } diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c index 243d94b9653..20ba728a464 100644 --- a/fs/nfsd/nfs3xdr.c +++ b/fs/nfsd/nfs3xdr.c @@ -343,8 +343,7 @@ nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p, /* set up the kvec */ v=0; while (len > 0) { - pn = rqstp->rq_resused; - svc_take_page(rqstp); + pn = rqstp->rq_resused++; args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]); args->vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE; len -= args->vec[v].iov_len; @@ -382,7 +381,7 @@ nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p, while (len > args->vec[v].iov_len) { len -= args->vec[v].iov_len; v++; - args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]); + args->vec[v].iov_base = page_address(rqstp->rq_pages[v]); args->vec[v].iov_len = PAGE_SIZE; } args->vec[v].iov_len = len; @@ -446,11 +445,11 @@ nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p, * This page appears in the rq_res.pages list, but as pages_len is always * 0, it won't get in the way */ - svc_take_page(rqstp); len = ntohl(*p++); if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE) return 0; - args->tname = new = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); + args->tname = new = + page_address(rqstp->rq_respages[rqstp->rq_resused++]); args->tlen = len; /* first copy and check from the first page */ old = (char*)p; @@ -522,8 +521,8 @@ nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, { if (!(p = decode_fh(p, &args->fh))) return 0; - svc_take_page(rqstp); - args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); + args->buffer = + page_address(rqstp->rq_respages[rqstp->rq_resused++]); return xdr_argsize_check(rqstp, p); } @@ -554,8 +553,8 @@ nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p, if (args->count > PAGE_SIZE) args->count = PAGE_SIZE; - svc_take_page(rqstp); - args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); + args->buffer = + page_address(rqstp->rq_respages[rqstp->rq_resused++]); return xdr_argsize_check(rqstp, p); } @@ -578,8 +577,7 @@ nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p, args->count = len; while (len > 0) { - pn = rqstp->rq_resused; - svc_take_page(rqstp); + pn = rqstp->rq_resused++; if (!args->buffer) args->buffer = page_address(rqstp->rq_respages[pn]); len -= PAGE_SIZE; @@ -668,7 +666,6 @@ nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p, rqstp->rq_res.page_len = resp->len; if (resp->len & 3) { /* need to pad the tail */ - rqstp->rq_restailpage = 0; rqstp->rq_res.tail[0].iov_base = p; *p = 0; rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); @@ -693,7 +690,6 @@ nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p, rqstp->rq_res.page_len = resp->count; if (resp->count & 3) { /* need to pad the tail */ - rqstp->rq_restailpage = 0; rqstp->rq_res.tail[0].iov_base = p; *p = 0; rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3); @@ -768,7 +764,6 @@ nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p, rqstp->rq_res.page_len = (resp->count) << 2; /* add the 'tail' to the end of the 'head' page - page 0. */ - rqstp->rq_restailpage = 0; rqstp->rq_res.tail[0].iov_base = p; *p++ = 0; /* no more entries */ *p++ = htonl(resp->common.err == nfserr_eof); diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 5be00436b5b..9f30c53ac0e 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -2039,7 +2039,8 @@ nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, int nfserr, struct n } static int -nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read *read) +nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, + struct nfsd4_read *read) { u32 eof; int v, pn; @@ -2061,10 +2062,11 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read len = maxcount; v = 0; while (len > 0) { - pn = resp->rqstp->rq_resused; - svc_take_page(resp->rqstp); - read->rd_iov[v].iov_base = page_address(resp->rqstp->rq_respages[pn]); - read->rd_iov[v].iov_len = len < PAGE_SIZE ? len : PAGE_SIZE; + pn = resp->rqstp->rq_resused++; + read->rd_iov[v].iov_base = + page_address(resp->rqstp->rq_respages[pn]); + read->rd_iov[v].iov_len = + len < PAGE_SIZE ? len : PAGE_SIZE; v++; len -= PAGE_SIZE; } @@ -2078,7 +2080,8 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read nfserr = nfserr_inval; if (nfserr) return nfserr; - eof = (read->rd_offset + maxcount >= read->rd_fhp->fh_dentry->d_inode->i_size); + eof = (read->rd_offset + maxcount >= + read->rd_fhp->fh_dentry->d_inode->i_size); WRITE32(eof); WRITE32(maxcount); @@ -2088,7 +2091,6 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read resp->xbuf->page_len = maxcount; /* Use rest of head for padding and remaining ops: */ - resp->rqstp->rq_restailpage = 0; resp->xbuf->tail[0].iov_base = p; resp->xbuf->tail[0].iov_len = 0; if (maxcount&3) { @@ -2113,8 +2115,7 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_r if (resp->xbuf->page_len) return nfserr_resource; - svc_take_page(resp->rqstp); - page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); + page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]); maxcount = PAGE_SIZE; RESERVE_SPACE(4); @@ -2138,7 +2139,6 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_r resp->xbuf->page_len = maxcount; /* Use rest of head for padding and remaining ops: */ - resp->rqstp->rq_restailpage = 0; resp->xbuf->tail[0].iov_base = p; resp->xbuf->tail[0].iov_len = 0; if (maxcount&3) { @@ -2189,8 +2189,7 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_re goto err_no_verf; } - svc_take_page(resp->rqstp); - page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); + page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]); readdir->common.err = 0; readdir->buflen = maxcount; readdir->buffer = page; @@ -2215,10 +2214,10 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_re p = readdir->buffer; *p++ = 0; /* no more entries */ *p++ = htonl(readdir->common.err == nfserr_eof); - resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); + resp->xbuf->page_len = ((char*)p) - (char*)page_address( + resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]); /* Use rest of head for padding and remaining ops: */ - resp->rqstp->rq_restailpage = 0; resp->xbuf->tail[0].iov_base = tailbase; resp->xbuf->tail[0].iov_len = 0; resp->p = resp->xbuf->tail[0].iov_base; diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c index 3f14a17eaa6..ad2fba3c54f 100644 --- a/fs/nfsd/nfsxdr.c +++ b/fs/nfsd/nfsxdr.c @@ -262,8 +262,7 @@ nfssvc_decode_readargs(struct svc_rqst *rqstp, u32 *p, */ v=0; while (len > 0) { - pn=rqstp->rq_resused; - svc_take_page(rqstp); + pn = rqstp->rq_resused++; args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]); args->vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE; len -= args->vec[v].iov_len; @@ -295,7 +294,7 @@ nfssvc_decode_writeargs(struct svc_rqst *rqstp, u32 *p, while (len > args->vec[v].iov_len) { len -= args->vec[v].iov_len; v++; - args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]); + args->vec[v].iov_base = page_address(rqstp->rq_pages[v]); args->vec[v].iov_len = PAGE_SIZE; } args->vec[v].iov_len = len; @@ -333,8 +332,7 @@ nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_readlinka { if (!(p = decode_fh(p, &args->fh))) return 0; - svc_take_page(rqstp); - args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); + args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]); return xdr_argsize_check(rqstp, p); } @@ -375,8 +373,7 @@ nfssvc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p, if (args->count > PAGE_SIZE) args->count = PAGE_SIZE; - svc_take_page(rqstp); - args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); + args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]); return xdr_argsize_check(rqstp, p); } @@ -416,7 +413,6 @@ nfssvc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p, rqstp->rq_res.page_len = resp->len; if (resp->len & 3) { /* need to pad the tail */ - rqstp->rq_restailpage = 0; rqstp->rq_res.tail[0].iov_base = p; *p = 0; rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); @@ -436,7 +432,6 @@ nfssvc_encode_readres(struct svc_rqst *rqstp, u32 *p, rqstp->rq_res.page_len = resp->count; if (resp->count & 3) { /* need to pad the tail */ - rqstp->rq_restailpage = 0; rqstp->rq_res.tail[0].iov_base = p; *p = 0; rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3); diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 443ebc52e38..bfd36e587ec 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -791,22 +791,26 @@ nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset { unsigned long count = desc->count; struct svc_rqst *rqstp = desc->arg.data; + struct page **pp = rqstp->rq_respages + rqstp->rq_resused; if (size > count) size = count; if (rqstp->rq_res.page_len == 0) { get_page(page); - rqstp->rq_respages[rqstp->rq_resused++] = page; + put_page(*pp); + *pp = page; + rqstp->rq_resused++; rqstp->rq_res.page_base = offset; rqstp->rq_res.page_len = size; - } else if (page != rqstp->rq_respages[rqstp->rq_resused-1]) { + } else if (page != pp[-1]) { get_page(page); - rqstp->rq_respages[rqstp->rq_resused++] = page; + put_page(*pp); + *pp = page; + rqstp->rq_resused++; rqstp->rq_res.page_len += size; - } else { + } else rqstp->rq_res.page_len += size; - } desc->count = count - size; desc->written += size; @@ -837,7 +841,7 @@ nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, file->f_ra = ra->p_ra; if (file->f_op->sendfile && rqstp->rq_sendfile_ok) { - svc_pushback_unused_pages(rqstp); + rqstp->rq_resused = 1; err = file->f_op->sendfile(file, &offset, *count, nfsd_read_actor, rqstp); } else { diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index 4ebcdf91f3b..3669e91c43b 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -170,7 +170,6 @@ static inline void svc_putu32(struct kvec *iov, __be32 val) /* * The context of a single thread, including the request currently being * processed. - * NOTE: First two items must be prev/next. */ struct svc_rqst { struct list_head rq_list; /* idle list */ @@ -189,12 +188,9 @@ struct svc_rqst { struct xdr_buf rq_arg; struct xdr_buf rq_res; - struct page * rq_argpages[RPCSVC_MAXPAGES]; - struct page * rq_respages[RPCSVC_MAXPAGES]; - int rq_restailpage; - short rq_argused; /* pages used for argument */ - short rq_arghi; /* pages available in argument page list */ - short rq_resused; /* pages used for result */ + struct page * rq_pages[RPCSVC_MAXPAGES]; + struct page * *rq_respages; /* points into rq_pages */ + int rq_resused; /* number of pages used for result */ __be32 rq_xid; /* transmission id */ u32 rq_prog; /* program number */ @@ -255,63 +251,18 @@ xdr_ressize_check(struct svc_rqst *rqstp, __be32 *p) return vec->iov_len <= PAGE_SIZE; } -static inline struct page * -svc_take_res_page(struct svc_rqst *rqstp) +static inline void svc_free_res_pages(struct svc_rqst *rqstp) { - if (rqstp->rq_arghi <= rqstp->rq_argused) - return NULL; - rqstp->rq_arghi--; - rqstp->rq_respages[rqstp->rq_resused] = - rqstp->rq_argpages[rqstp->rq_arghi]; - return rqstp->rq_respages[rqstp->rq_resused++]; -} - -static inline void svc_take_page(struct svc_rqst *rqstp) -{ - if (rqstp->rq_arghi <= rqstp->rq_argused) { - WARN_ON(1); - return; - } - rqstp->rq_arghi--; - rqstp->rq_respages[rqstp->rq_resused] = - rqstp->rq_argpages[rqstp->rq_arghi]; - rqstp->rq_resused++; -} - -static inline void svc_pushback_allpages(struct svc_rqst *rqstp) -{ - while (rqstp->rq_resused) { - if (rqstp->rq_respages[--rqstp->rq_resused] == NULL) - continue; - rqstp->rq_argpages[rqstp->rq_arghi++] = - rqstp->rq_respages[rqstp->rq_resused]; - rqstp->rq_respages[rqstp->rq_resused] = NULL; - } -} - -static inline void svc_pushback_unused_pages(struct svc_rqst *rqstp) -{ - while (rqstp->rq_resused && - rqstp->rq_res.pages != &rqstp->rq_respages[rqstp->rq_resused]) { - - if (rqstp->rq_respages[--rqstp->rq_resused] != NULL) { - rqstp->rq_argpages[rqstp->rq_arghi++] = - rqstp->rq_respages[rqstp->rq_resused]; - rqstp->rq_respages[rqstp->rq_resused] = NULL; + while (rqstp->rq_resused) { + struct page **pp = (rqstp->rq_respages + + --rqstp->rq_resused); + if (*pp) { + put_page(*pp); + *pp = NULL; } } } -static inline void svc_free_allpages(struct svc_rqst *rqstp) -{ - while (rqstp->rq_resused) { - if (rqstp->rq_respages[--rqstp->rq_resused] == NULL) - continue; - put_page(rqstp->rq_respages[rqstp->rq_resused]); - rqstp->rq_respages[rqstp->rq_resused] = NULL; - } -} - struct svc_deferred_req { u32 prot; /* protocol (UDP or TCP) */ struct sockaddr_in addr; diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c index 638c0b57620..558692d7e46 100644 --- a/net/sunrpc/auth_gss/svcauth_gss.c +++ b/net/sunrpc/auth_gss/svcauth_gss.c @@ -1191,7 +1191,6 @@ svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) resbuf->tail[0].iov_base = resbuf->head[0].iov_base + resbuf->head[0].iov_len; resbuf->tail[0].iov_len = 0; - rqstp->rq_restailpage = 0; resv = &resbuf->tail[0]; } else { resv = &resbuf->tail[0]; @@ -1240,7 +1239,7 @@ svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) inpages = resbuf->pages; /* XXX: Would be better to write some xdr helper functions for * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ - if (resbuf->tail[0].iov_base && rqstp->rq_restailpage == 0) { + if (resbuf->tail[0].iov_base) { BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base + PAGE_SIZE); BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base); @@ -1258,7 +1257,6 @@ svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) resbuf->tail[0].iov_base = resbuf->head[0].iov_base + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; resbuf->tail[0].iov_len = 0; - rqstp->rq_restailpage = 0; } if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) return -ENOMEM; diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index a99e67b164c..f4a509a925b 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -417,18 +417,15 @@ svc_init_buffer(struct svc_rqst *rqstp, unsigned int size) if (size > RPCSVC_MAXPAYLOAD) size = RPCSVC_MAXPAYLOAD; pages = 2 + (size+ PAGE_SIZE -1) / PAGE_SIZE; - rqstp->rq_argused = 0; - rqstp->rq_resused = 0; arghi = 0; BUG_ON(pages > RPCSVC_MAXPAGES); while (pages) { struct page *p = alloc_page(GFP_KERNEL); if (!p) break; - rqstp->rq_argpages[arghi++] = p; + rqstp->rq_pages[arghi++] = p; pages--; } - rqstp->rq_arghi = arghi; return ! pages; } @@ -438,14 +435,10 @@ svc_init_buffer(struct svc_rqst *rqstp, unsigned int size) static void svc_release_buffer(struct svc_rqst *rqstp) { - while (rqstp->rq_arghi) - put_page(rqstp->rq_argpages[--rqstp->rq_arghi]); - while (rqstp->rq_resused) { - if (rqstp->rq_respages[--rqstp->rq_resused] == NULL) - continue; - put_page(rqstp->rq_respages[rqstp->rq_resused]); - } - rqstp->rq_argused = 0; + int i; + for (i=0; irq_pages); i++) + if (rqstp->rq_pages[i]) + put_page(rqstp->rq_pages[i]); } /* @@ -707,10 +700,10 @@ svc_process(struct svc_rqst *rqstp) /* setup response xdr_buf. * Initially it has just one page */ - svc_take_page(rqstp); /* must succeed */ + rqstp->rq_resused = 1; resv->iov_base = page_address(rqstp->rq_respages[0]); resv->iov_len = 0; - rqstp->rq_res.pages = rqstp->rq_respages+1; + rqstp->rq_res.pages = rqstp->rq_respages + 1; rqstp->rq_res.len = 0; rqstp->rq_res.page_base = 0; rqstp->rq_res.page_len = 0; diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 4de8626e4f5..25096d53667 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -313,7 +313,7 @@ svc_sock_release(struct svc_rqst *rqstp) svc_release_skb(rqstp); - svc_free_allpages(rqstp); + svc_free_res_pages(rqstp); rqstp->rq_res.page_len = 0; rqstp->rq_res.page_base = 0; @@ -412,7 +412,8 @@ svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) /* send head */ if (slen == xdr->head[0].iov_len) flags = 0; - len = kernel_sendpage(sock, rqstp->rq_respages[0], 0, xdr->head[0].iov_len, flags); + len = kernel_sendpage(sock, rqstp->rq_respages[0], 0, + xdr->head[0].iov_len, flags); if (len != xdr->head[0].iov_len) goto out; slen -= xdr->head[0].iov_len; @@ -437,8 +438,9 @@ svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) } /* send tail */ if (xdr->tail[0].iov_len) { - result = kernel_sendpage(sock, rqstp->rq_respages[rqstp->rq_restailpage], - ((unsigned long)xdr->tail[0].iov_base)& (PAGE_SIZE-1), + result = kernel_sendpage(sock, rqstp->rq_respages[0], + ((unsigned long)xdr->tail[0].iov_base) + & (PAGE_SIZE-1), xdr->tail[0].iov_len, 0); if (result > 0) @@ -708,9 +710,11 @@ svc_udp_recvfrom(struct svc_rqst *rqstp) if (len <= rqstp->rq_arg.head[0].iov_len) { rqstp->rq_arg.head[0].iov_len = len; rqstp->rq_arg.page_len = 0; + rqstp->rq_respages = rqstp->rq_pages+1; } else { rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; - rqstp->rq_argused += (rqstp->rq_arg.page_len + PAGE_SIZE - 1)/ PAGE_SIZE; + rqstp->rq_respages = rqstp->rq_pages + 1 + + (rqstp->rq_arg.page_len + PAGE_SIZE - 1)/ PAGE_SIZE; } if (serv->sv_stats) @@ -1053,11 +1057,12 @@ svc_tcp_recvfrom(struct svc_rqst *rqstp) vlen = PAGE_SIZE; pnum = 1; while (vlen < len) { - vec[pnum].iov_base = page_address(rqstp->rq_argpages[rqstp->rq_argused++]); + vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]); vec[pnum].iov_len = PAGE_SIZE; pnum++; vlen += PAGE_SIZE; } + rqstp->rq_respages = &rqstp->rq_pages[pnum]; /* Now receive data */ len = svc_recvfrom(rqstp, vec, pnum, len); @@ -1209,7 +1214,7 @@ svc_recv(struct svc_rqst *rqstp, long timeout) struct svc_sock *svsk =NULL; struct svc_serv *serv = rqstp->rq_server; struct svc_pool *pool = rqstp->rq_pool; - int len; + int len, i; int pages; struct xdr_buf *arg; DECLARE_WAITQUEUE(wait, current); @@ -1226,27 +1231,22 @@ svc_recv(struct svc_rqst *rqstp, long timeout) "svc_recv: service %p, wait queue active!\n", rqstp); - /* Initialize the buffers */ - /* first reclaim pages that were moved to response list */ - svc_pushback_allpages(rqstp); /* now allocate needed pages. If we get a failure, sleep briefly */ pages = 2 + (serv->sv_bufsz + PAGE_SIZE -1) / PAGE_SIZE; - while (rqstp->rq_arghi < pages) { - struct page *p = alloc_page(GFP_KERNEL); - if (!p) { - schedule_timeout_uninterruptible(msecs_to_jiffies(500)); - continue; + for (i=0; i < pages ; i++) + while (rqstp->rq_pages[i] == NULL) { + struct page *p = alloc_page(GFP_KERNEL); + if (!p) + schedule_timeout_uninterruptible(msecs_to_jiffies(500)); + rqstp->rq_pages[i] = p; } - rqstp->rq_argpages[rqstp->rq_arghi++] = p; - } /* Make arg->head point to first page and arg->pages point to rest */ arg = &rqstp->rq_arg; - arg->head[0].iov_base = page_address(rqstp->rq_argpages[0]); + arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); arg->head[0].iov_len = PAGE_SIZE; - rqstp->rq_argused = 1; - arg->pages = rqstp->rq_argpages + 1; + arg->pages = rqstp->rq_pages + 1; arg->page_base = 0; /* save at least one page for response */ arg->page_len = (pages-2)*PAGE_SIZE; @@ -1704,6 +1704,7 @@ static int svc_deferred_recv(struct svc_rqst *rqstp) rqstp->rq_prot = dr->prot; rqstp->rq_addr = dr->addr; rqstp->rq_daddr = dr->daddr; + rqstp->rq_respages = rqstp->rq_pages; return dr->argslen<<2; } -- 2.20.1