diff options
author | J. Bruce Fields <bfields@redhat.com> | 2013-08-26 16:04:46 -0400 |
---|---|---|
committer | J. Bruce Fields <bfields@redhat.com> | 2014-05-30 17:31:54 -0400 |
commit | 2825a7f90753012babe7ee292f4a1eadd3706f92 (patch) | |
tree | fd536a28343ffc50432d0f8e7627929e06c023bf /fs | |
parent | a8095f7e80fbf3e0efe4ee5cd3f509113c56290f (diff) | |
download | linux-2825a7f90753012babe7ee292f4a1eadd3706f92.tar.bz2 |
nfsd4: allow encoding across page boundaries
After this we can handle for example getattr of very large ACLs.
Read, readdir, readlink are still special cases with their own limits.
Also we can't handle a new operation starting close to the end of a
page.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/nfsd/nfs4proc.c | 4 | ||||
-rw-r--r-- | fs/nfsd/nfs4xdr.c | 60 |
2 files changed, 47 insertions, 17 deletions
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 3ce431b9b577..5d8f9158701d 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1264,6 +1264,10 @@ static void svcxdr_init_encode(struct svc_rqst *rqstp, xdr->end = head->iov_base + PAGE_SIZE - 2 * RPC_MAX_AUTH_SIZE; /* Tail and page_len should be zero at this point: */ buf->len = buf->head[0].iov_len; + xdr->scratch.iov_len = 0; + xdr->page_ptr = buf->pages; + buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages) + - 2 * RPC_MAX_AUTH_SIZE; } /* diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index bd529e523087..d3a576dbd99b 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -1624,6 +1624,7 @@ static int nfsd4_max_reply(u32 opnum) * the head and tail in another page: */ return 2 * PAGE_SIZE; + case OP_GETATTR: case OP_READ: return INT_MAX; default: @@ -2560,21 +2561,31 @@ out_resource: goto out; } +static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr, + struct xdr_buf *buf, __be32 *p, int bytes) +{ + xdr->scratch.iov_len = 0; + memset(buf, 0, sizeof(struct xdr_buf)); + buf->head[0].iov_base = p; + buf->head[0].iov_len = 0; + buf->len = 0; + xdr->buf = buf; + xdr->iov = buf->head; + xdr->p = p; + xdr->end = (void *)p + bytes; + buf->buflen = bytes; +} + __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words, struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry, u32 *bmval, struct svc_rqst *rqstp, int ignore_crossmnt) { - struct xdr_buf dummy = { - .head[0] = { - .iov_base = *p, - }, - .buflen = words << 2, - }; + struct xdr_buf dummy; struct xdr_stream xdr; __be32 ret; - xdr_init_encode(&xdr, &dummy, NULL); + svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2); ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp, ignore_crossmnt); *p = xdr.p; @@ -3064,8 +3075,6 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, if (nfserr) return nfserr; - if (resp->xdr.buf->page_len) - return nfserr_resource; p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ if (!p) @@ -3075,6 +3084,9 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, if (xdr->end - xdr->p < 1) return nfserr_resource; + if (resp->xdr.buf->page_len) + return nfserr_resource; + maxcount = svc_max_payload(resp->rqstp); if (maxcount > read->rd_length) maxcount = read->rd_length; @@ -3119,6 +3131,8 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, - (char *)resp->xdr.buf->head[0].iov_base); resp->xdr.buf->page_len = maxcount; xdr->buf->len += maxcount; + xdr->page_ptr += v; + xdr->buf->buflen = maxcount + PAGE_SIZE - 2 * RPC_MAX_AUTH_SIZE; xdr->iov = xdr->buf->tail; /* Use rest of head for padding and remaining ops: */ @@ -3145,6 +3159,11 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd if (nfserr) return nfserr; + + p = xdr_reserve_space(xdr, 4); + if (!p) + return nfserr_resource; + if (resp->xdr.buf->page_len) return nfserr_resource; if (!*resp->rqstp->rq_next_page) @@ -3154,10 +3173,6 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd maxcount = PAGE_SIZE; - p = xdr_reserve_space(xdr, 4); - if (!p) - return nfserr_resource; - if (xdr->end - xdr->p < 1) return nfserr_resource; @@ -3180,6 +3195,8 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd - (char *)resp->xdr.buf->head[0].iov_base; resp->xdr.buf->page_len = maxcount; xdr->buf->len += maxcount; + xdr->page_ptr += 1; + xdr->buf->buflen -= PAGE_SIZE; xdr->iov = xdr->buf->tail; /* Use rest of head for padding and remaining ops: */ @@ -3206,15 +3223,16 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4 if (nfserr) return nfserr; - if (resp->xdr.buf->page_len) - return nfserr_resource; - if (!*resp->rqstp->rq_next_page) - return nfserr_resource; p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); if (!p) return nfserr_resource; + if (resp->xdr.buf->page_len) + return nfserr_resource; + if (!*resp->rqstp->rq_next_page) + return nfserr_resource; + /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ WRITE32(0); WRITE32(0); @@ -3266,6 +3284,10 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4 xdr->iov = xdr->buf->tail; + xdr->page_ptr++; + xdr->buf->buflen -= PAGE_SIZE; + xdr->iov = xdr->buf->tail; + /* Use rest of head for padding and remaining ops: */ resp->xdr.buf->tail[0].iov_base = tailbase; resp->xdr.buf->tail[0].iov_len = 0; @@ -3800,6 +3822,8 @@ nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) !nfsd4_enc_ops[op->opnum]); encoder = nfsd4_enc_ops[op->opnum]; op->status = encoder(resp, op->status, &op->u); + xdr_commit_encode(xdr); + /* nfsd4_check_resp_size guarantees enough room for error status */ if (!op->status) { int space_needed = 0; @@ -3919,6 +3943,8 @@ nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compo WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len); + rqstp->rq_next_page = resp->xdr.page_ptr + 1; + p = resp->tagp; *p++ = htonl(resp->taglen); memcpy(p, resp->tag, resp->taglen); |