diff options
Diffstat (limited to 'fs/nfsd/nfs3xdr.c')
| -rw-r--r-- | fs/nfsd/nfs3xdr.c | 1092 |
1 files changed, 1092 insertions, 0 deletions
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c new file mode 100644 index 000000000000..11f806835c5a --- /dev/null +++ b/fs/nfsd/nfs3xdr.c @@ -0,0 +1,1092 @@ +/* + * linux/fs/nfsd/nfs3xdr.c + * + * XDR support for nfsd/protocol version 3. + * + * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> + * + * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()! + */ + +#include <linux/types.h> +#include <linux/time.h> +#include <linux/nfs3.h> +#include <linux/list.h> +#include <linux/spinlock.h> +#include <linux/dcache.h> +#include <linux/namei.h> +#include <linux/mm.h> +#include <linux/vfs.h> +#include <linux/sunrpc/xdr.h> +#include <linux/sunrpc/svc.h> +#include <linux/nfsd/nfsd.h> +#include <linux/nfsd/xdr3.h> + +#define NFSDDBG_FACILITY NFSDDBG_XDR + +#ifdef NFSD_OPTIMIZE_SPACE +# define inline +#endif + + +/* + * Mapping of S_IF* types to NFS file types + */ +static u32 nfs3_ftypes[] = { + NF3NON, NF3FIFO, NF3CHR, NF3BAD, + NF3DIR, NF3BAD, NF3BLK, NF3BAD, + NF3REG, NF3BAD, NF3LNK, NF3BAD, + NF3SOCK, NF3BAD, NF3LNK, NF3BAD, +}; + +/* + * XDR functions for basic NFS types + */ +static inline u32 * +encode_time3(u32 *p, struct timespec *time) +{ + *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec); + return p; +} + +static inline u32 * +decode_time3(u32 *p, struct timespec *time) +{ + time->tv_sec = ntohl(*p++); + time->tv_nsec = ntohl(*p++); + return p; +} + +static inline u32 * +decode_fh(u32 *p, struct svc_fh *fhp) +{ + unsigned int size; + fh_init(fhp, NFS3_FHSIZE); + size = ntohl(*p++); + if (size > NFS3_FHSIZE) + return NULL; + + memcpy(&fhp->fh_handle.fh_base, p, size); + fhp->fh_handle.fh_size = size; + return p + XDR_QUADLEN(size); +} + +static inline u32 * +encode_fh(u32 *p, struct svc_fh *fhp) +{ + unsigned int size = fhp->fh_handle.fh_size; + *p++ = htonl(size); + if (size) p[XDR_QUADLEN(size)-1]=0; + memcpy(p, &fhp->fh_handle.fh_base, size); + return p + XDR_QUADLEN(size); +} + +/* + * Decode a file name and make sure that the path contains + * no slashes or null bytes. + */ +static inline u32 * +decode_filename(u32 *p, char **namp, int *lenp) +{ + char *name; + int i; + + if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) { + for (i = 0, name = *namp; i < *lenp; i++, name++) { + if (*name == '\0' || *name == '/') + return NULL; + } + } + + return p; +} + +static inline u32 * +decode_sattr3(u32 *p, struct iattr *iap) +{ + u32 tmp; + + iap->ia_valid = 0; + + if (*p++) { + iap->ia_valid |= ATTR_MODE; + iap->ia_mode = ntohl(*p++); + } + if (*p++) { + iap->ia_valid |= ATTR_UID; + iap->ia_uid = ntohl(*p++); + } + if (*p++) { + iap->ia_valid |= ATTR_GID; + iap->ia_gid = ntohl(*p++); + } + if (*p++) { + u64 newsize; + + iap->ia_valid |= ATTR_SIZE; + p = xdr_decode_hyper(p, &newsize); + if (newsize <= NFS_OFFSET_MAX) + iap->ia_size = newsize; + else + iap->ia_size = NFS_OFFSET_MAX; + } + if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ + iap->ia_valid |= ATTR_ATIME; + } else if (tmp == 2) { /* set to client time */ + iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; + iap->ia_atime.tv_sec = ntohl(*p++); + iap->ia_atime.tv_nsec = ntohl(*p++); + } + if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ + iap->ia_valid |= ATTR_MTIME; + } else if (tmp == 2) { /* set to client time */ + iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; + iap->ia_mtime.tv_sec = ntohl(*p++); + iap->ia_mtime.tv_nsec = ntohl(*p++); + } + return p; +} + +static inline u32 * +encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) +{ + struct vfsmount *mnt = fhp->fh_export->ex_mnt; + struct dentry *dentry = fhp->fh_dentry; + struct kstat stat; + struct timespec time; + + vfs_getattr(mnt, dentry, &stat); + + *p++ = htonl(nfs3_ftypes[(stat.mode & S_IFMT) >> 12]); + *p++ = htonl((u32) stat.mode); + *p++ = htonl((u32) stat.nlink); + *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid)); + *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid)); + if (S_ISLNK(stat.mode) && stat.size > NFS3_MAXPATHLEN) { + p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); + } else { + p = xdr_encode_hyper(p, (u64) stat.size); + } + p = xdr_encode_hyper(p, ((u64)stat.blocks) << 9); + *p++ = htonl((u32) MAJOR(stat.rdev)); + *p++ = htonl((u32) MINOR(stat.rdev)); + if (is_fsid(fhp, rqstp->rq_reffh)) + p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); + else + p = xdr_encode_hyper(p, (u64) huge_encode_dev(stat.dev)); + p = xdr_encode_hyper(p, (u64) stat.ino); + p = encode_time3(p, &stat.atime); + lease_get_mtime(dentry->d_inode, &time); + p = encode_time3(p, &time); + p = encode_time3(p, &stat.ctime); + + return p; +} + +static inline u32 * +encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) +{ + struct inode *inode = fhp->fh_dentry->d_inode; + + /* Attributes to follow */ + *p++ = xdr_one; + + *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]); + *p++ = htonl((u32) fhp->fh_post_mode); + *p++ = htonl((u32) fhp->fh_post_nlink); + *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid)); + *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid)); + if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) { + p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); + } else { + p = xdr_encode_hyper(p, (u64) fhp->fh_post_size); + } + p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9); + *p++ = fhp->fh_post_rdev[0]; + *p++ = fhp->fh_post_rdev[1]; + if (is_fsid(fhp, rqstp->rq_reffh)) + p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); + else + p = xdr_encode_hyper(p, (u64)huge_encode_dev(inode->i_sb->s_dev)); + p = xdr_encode_hyper(p, (u64) inode->i_ino); + p = encode_time3(p, &fhp->fh_post_atime); + p = encode_time3(p, &fhp->fh_post_mtime); + p = encode_time3(p, &fhp->fh_post_ctime); + + return p; +} + +/* + * Encode post-operation attributes. + * The inode may be NULL if the call failed because of a stale file + * handle. In this case, no attributes are returned. + */ +static u32 * +encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) +{ + struct dentry *dentry = fhp->fh_dentry; + if (dentry && dentry->d_inode != NULL) { + *p++ = xdr_one; /* attributes follow */ + return encode_fattr3(rqstp, p, fhp); + } + *p++ = xdr_zero; + return p; +} + +/* + * Enocde weak cache consistency data + */ +static u32 * +encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) +{ + struct dentry *dentry = fhp->fh_dentry; + + if (dentry && dentry->d_inode && fhp->fh_post_saved) { + if (fhp->fh_pre_saved) { + *p++ = xdr_one; + p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size); + p = encode_time3(p, &fhp->fh_pre_mtime); + p = encode_time3(p, &fhp->fh_pre_ctime); + } else { + *p++ = xdr_zero; + } + return encode_saved_post_attr(rqstp, p, fhp); + } + /* no pre- or post-attrs */ + *p++ = xdr_zero; + return encode_post_op_attr(rqstp, p, fhp); +} + + +/* + * XDR decode functions + */ +int +nfs3svc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args) +{ + if (!(p = decode_fh(p, &args->fh))) + return 0; + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_sattrargs *args) +{ + if (!(p = decode_fh(p, &args->fh)) + || !(p = decode_sattr3(p, &args->attrs))) + return 0; + + if ((args->check_guard = ntohl(*p++)) != 0) { + struct timespec time; + p = decode_time3(p, &time); + args->guardtime = time.tv_sec; + } + + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_diropargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_diropargs *args) +{ + if (!(p = decode_fh(p, &args->fh)) + || !(p = decode_filename(p, &args->name, &args->len))) + return 0; + + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_accessargs *args) +{ + if (!(p = decode_fh(p, &args->fh))) + return 0; + args->access = ntohl(*p++); + + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_readargs *args) +{ + unsigned int len; + int v,pn; + + if (!(p = decode_fh(p, &args->fh)) + || !(p = xdr_decode_hyper(p, &args->offset))) + return 0; + + len = args->count = ntohl(*p++); + + if (len > NFSSVC_MAXBLKSIZE) + len = NFSSVC_MAXBLKSIZE; + + /* set up the kvec */ + v=0; + while (len > 0) { + pn = rqstp->rq_resused; + svc_take_page(rqstp); + 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; + v++; + } + args->vlen = v; + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_writeargs *args) +{ + unsigned int len, v, hdr; + + if (!(p = decode_fh(p, &args->fh)) + || !(p = xdr_decode_hyper(p, &args->offset))) + return 0; + + args->count = ntohl(*p++); + args->stable = ntohl(*p++); + len = args->len = ntohl(*p++); + + hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; + if (rqstp->rq_arg.len < len + hdr) + return 0; + + args->vec[0].iov_base = (void*)p; + args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; + + if (len > NFSSVC_MAXBLKSIZE) + len = NFSSVC_MAXBLKSIZE; + v= 0; + 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_len = PAGE_SIZE; + } + args->vec[v].iov_len = len; + args->vlen = v+1; + + return args->count == args->len && args->vec[0].iov_len > 0; +} + +int +nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_createargs *args) +{ + if (!(p = decode_fh(p, &args->fh)) + || !(p = decode_filename(p, &args->name, &args->len))) + return 0; + + switch (args->createmode = ntohl(*p++)) { + case NFS3_CREATE_UNCHECKED: + case NFS3_CREATE_GUARDED: + if (!(p = decode_sattr3(p, &args->attrs))) + return 0; + break; + case NFS3_CREATE_EXCLUSIVE: + args->verf = p; + p += 2; + break; + default: + return 0; + } + + return xdr_argsize_check(rqstp, p); +} +int +nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_createargs *args) +{ + if (!(p = decode_fh(p, &args->fh)) + || !(p = decode_filename(p, &args->name, &args->len)) + || !(p = decode_sattr3(p, &args->attrs))) + return 0; + + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_symlinkargs *args) +{ + unsigned int len; + int avail; + char *old, *new; + struct kvec *vec; + + if (!(p = decode_fh(p, &args->ffh)) + || !(p = decode_filename(p, &args->fname, &args->flen)) + || !(p = decode_sattr3(p, &args->attrs)) + ) + return 0; + /* now decode the pathname, which might be larger than the first page. + * As we have to check for nul's anyway, we copy it into a new page + * 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->tlen = len; + /* first copy and check from the first page */ + old = (char*)p; + vec = &rqstp->rq_arg.head[0]; + avail = vec->iov_len - (old - (char*)vec->iov_base); + while (len && avail && *old) { + *new++ = *old++; + len--; + avail--; + } + /* now copy next page if there is one */ + if (len && !avail && rqstp->rq_arg.page_len) { + avail = rqstp->rq_arg.page_len; + if (avail > PAGE_SIZE) avail = PAGE_SIZE; + old = page_address(rqstp->rq_arg.pages[0]); + } + while (len && avail && *old) { + *new++ = *old++; + len--; + avail--; + } + *new = '\0'; + if (len) + return 0; + + return 1; +} + +int +nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_mknodargs *args) +{ + if (!(p = decode_fh(p, &args->fh)) + || !(p = decode_filename(p, &args->name, &args->len))) + return 0; + + args->ftype = ntohl(*p++); + + if (args->ftype == NF3BLK || args->ftype == NF3CHR + || args->ftype == NF3SOCK || args->ftype == NF3FIFO) { + if (!(p = decode_sattr3(p, &args->attrs))) + return 0; + } + + if (args->ftype == NF3BLK || args->ftype == NF3CHR) { + args->major = ntohl(*p++); + args->minor = ntohl(*p++); + } + + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_renameargs *args) +{ + if (!(p = decode_fh(p, &args->ffh)) + || !(p = decode_filename(p, &args->fname, &args->flen)) + || !(p = decode_fh(p, &args->tfh)) + || !(p = decode_filename(p, &args->tname, &args->tlen))) + return 0; + + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_readlinkargs *args) +{ + if (!(p = decode_fh(p, &args->fh))) + return 0; + svc_take_page(rqstp); + args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]); + + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_linkargs *args) +{ + if (!(p = decode_fh(p, &args->ffh)) + || !(p = decode_fh(p, &args->tfh)) + || !(p = decode_filename(p, &args->tname, &args->tlen))) + return 0; + + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_readdirargs *args) +{ + if (!(p = decode_fh(p, &args->fh))) + return 0; + p = xdr_decode_hyper(p, &args->cookie); + args->verf = p; p += 2; + args->dircount = ~0; + args->count = ntohl(*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]); + + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_readdirargs *args) +{ + int len, pn; + + if (!(p = decode_fh(p, &args->fh))) + return 0; + p = xdr_decode_hyper(p, &args->cookie); + args->verf = p; p += 2; + args->dircount = ntohl(*p++); + args->count = ntohl(*p++); + + len = (args->count > NFSSVC_MAXBLKSIZE) ? NFSSVC_MAXBLKSIZE : + args->count; + args->count = len; + + while (len > 0) { + pn = rqstp->rq_resused; + svc_take_page(rqstp); + if (!args->buffer) + args->buffer = page_address(rqstp->rq_respages[pn]); + len -= PAGE_SIZE; + } + + return xdr_argsize_check(rqstp, p); +} + +int +nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_commitargs *args) +{ + if (!(p = decode_fh(p, &args->fh))) + return 0; + p = xdr_decode_hyper(p, &args->offset); + args->count = ntohl(*p++); + + return xdr_argsize_check(rqstp, p); +} + +/* + * XDR encode functions + */ +/* + * There must be an encoding function for void results so svc_process + * will work properly. + */ +int +nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy) +{ + return xdr_ressize_check(rqstp, p); +} + +/* GETATTR */ +int +nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_attrstat *resp) +{ + if (resp->status == 0) + p = encode_fattr3(rqstp, p, &resp->fh); + return xdr_ressize_check(rqstp, p); +} + +/* SETATTR, REMOVE, RMDIR */ +int +nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_attrstat *resp) +{ + p = encode_wcc_data(rqstp, p, &resp->fh); + return xdr_ressize_check(rqstp, p); +} + +/* LOOKUP */ +int +nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_diropres *resp) +{ + if (resp->status == 0) { + p = encode_fh(p, &resp->fh); + p = encode_post_op_attr(rqstp, p, &resp->fh); + } + p = encode_post_op_attr(rqstp, p, &resp->dirfh); + return xdr_ressize_check(rqstp, p); +} + +/* ACCESS */ +int +nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_accessres *resp) +{ + p = encode_post_op_attr(rqstp, p, &resp->fh); + if (resp->status == 0) + *p++ = htonl(resp->access); + return xdr_ressize_check(rqstp, p); +} + +/* READLINK */ +int +nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_readlinkres *resp) +{ + p = encode_post_op_attr(rqstp, p, &resp->fh); + if (resp->status == 0) { + *p++ = htonl(resp->len); + xdr_ressize_check(rqstp, 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); + } + return 1; + } else + return xdr_ressize_check(rqstp, p); +} + +/* READ */ +int +nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_readres *resp) +{ + p = encode_post_op_attr(rqstp, p, &resp->fh); + if (resp->status == 0) { + *p++ = htonl(resp->count); + *p++ = htonl(resp->eof); + *p++ = htonl(resp->count); /* xdr opaque count */ + xdr_ressize_check(rqstp, p); + /* now update rqstp->rq_res to reflect data aswell */ + 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); + } + return 1; + } else + return xdr_ressize_check(rqstp, p); +} + +/* WRITE */ +int +nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_writeres *resp) +{ + p = encode_wcc_data(rqstp, p, &resp->fh); + if (resp->status == 0) { + *p++ = htonl(resp->count); + *p++ = htonl(resp->committed); + *p++ = htonl(nfssvc_boot.tv_sec); + *p++ = htonl(nfssvc_boot.tv_usec); + } + return xdr_ressize_check(rqstp, p); +} + +/* CREATE, MKDIR, SYMLINK, MKNOD */ +int +nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_diropres *resp) +{ + if (resp->status == 0) { + *p++ = xdr_one; + p = encode_fh(p, &resp->fh); + p = encode_post_op_attr(rqstp, p, &resp->fh); + } + p = encode_wcc_data(rqstp, p, &resp->dirfh); + return xdr_ressize_check(rqstp, p); +} + +/* RENAME */ +int +nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_renameres *resp) +{ + p = encode_wcc_data(rqstp, p, &resp->ffh); + p = encode_wcc_data(rqstp, p, &resp->tfh); + return xdr_ressize_check(rqstp, p); +} + +/* LINK */ +int +nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_linkres *resp) +{ + p = encode_post_op_attr(rqstp, p, &resp->fh); + p = encode_wcc_data(rqstp, p, &resp->tfh); + return xdr_ressize_check(rqstp, p); +} + +/* READDIR */ +int +nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_readdirres *resp) +{ + p = encode_post_op_attr(rqstp, p, &resp->fh); + + if (resp->status == 0) { + /* stupid readdir cookie */ + memcpy(p, resp->verf, 8); p += 2; + xdr_ressize_check(rqstp, p); + if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) + return 1; /*No room for trailer */ + 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); + rqstp->rq_res.tail[0].iov_len = 2<<2; + return 1; + } else + return xdr_ressize_check(rqstp, p); +} + +static inline u32 * +encode_entry_baggage(struct nfsd3_readdirres *cd, u32 *p, const char *name, + int namlen, ino_t ino) +{ + *p++ = xdr_one; /* mark entry present */ + p = xdr_encode_hyper(p, ino); /* file id */ + p = xdr_encode_array(p, name, namlen);/* name length & name */ + + cd->offset = p; /* remember pointer */ + p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ + + return p; +} + +static inline u32 * +encode_entryplus_baggage(struct nfsd3_readdirres *cd, u32 *p, + struct svc_fh *fhp) +{ + p = encode_post_op_attr(cd->rqstp, p, fhp); + *p++ = xdr_one; /* yes, a file handle follows */ + p = encode_fh(p, fhp); + fh_put(fhp); + return p; +} + +static int +compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, + const char *name, int namlen) +{ + struct svc_export *exp; + struct dentry *dparent, *dchild; + int rv = 0; + + dparent = cd->fh.fh_dentry; + exp = cd->fh.fh_export; + + fh_init(fhp, NFS3_FHSIZE); + if (isdotent(name, namlen)) { + if (namlen == 2) { + dchild = dget_parent(dparent); + if (dchild == dparent) { + /* filesystem root - cannot return filehandle for ".." */ + dput(dchild); + return 1; + } + } else + dchild = dget(dparent); + } else + dchild = lookup_one_len(name, dparent, namlen); + if (IS_ERR(dchild)) + return 1; + if (d_mountpoint(dchild) || + fh_compose(fhp, exp, dchild, &cd->fh) != 0 || + !dchild->d_inode) + rv = 1; + dput(dchild); + return rv; +} + +/* + * Encode a directory entry. This one works for both normal readdir + * and readdirplus. + * The normal readdir reply requires 2 (fileid) + 1 (stringlen) + * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. + * + * The readdirplus baggage is 1+21 words for post_op_attr, plus the + * file handle. + */ + +#define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) +#define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) +static int +encode_entry(struct readdir_cd *ccd, const char *name, + int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus) +{ + struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, + common); + u32 *p = cd->buffer; + caddr_t curr_page_addr = NULL; + int pn; /* current page number */ + int slen; /* string (name) length */ + int elen; /* estimated entry length in words */ + int num_entry_words = 0; /* actual number of words */ + + if (cd->offset) { + u64 offset64 = offset; + + if (unlikely(cd->offset1)) { + /* we ended up with offset on a page boundary */ + *cd->offset = htonl(offset64 >> 32); + *cd->offset1 = htonl(offset64 & 0xffffffff); + cd->offset1 = NULL; + } else { + xdr_encode_hyper(cd->offset, (u64) offset); + } + } + + /* + dprintk("encode_entry(%.*s @%ld%s)\n", + namlen, name, (long) offset, plus? " plus" : ""); + */ + + /* truncate filename if too long */ + if (namlen > NFS3_MAXNAMLEN) + namlen = NFS3_MAXNAMLEN; + + slen = XDR_QUADLEN(namlen); + elen = slen + NFS3_ENTRY_BAGGAGE + + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); + + if (cd->buflen < elen) { + cd->common.err = nfserr_toosmall; + return -EINVAL; + } + + /* determine which page in rq_respages[] we are currently filling */ + for (pn=1; pn < cd->rqstp->rq_resused; pn++) { + curr_page_addr = page_address(cd->rqstp->rq_respages[pn]); + + if (((caddr_t)cd->buffer >= curr_page_addr) && + ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) + break; + } + + if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { + /* encode entry in current page */ + + p = encode_entry_baggage(cd, p, name, namlen, ino); + + /* throw in readdirplus baggage */ + if (plus) { + struct svc_fh fh; + + if (compose_entry_fh(cd, &fh, name, namlen) > 0) { + *p++ = 0; + *p++ = 0; + } else + p = encode_entryplus_baggage(cd, p, &fh); + } + num_entry_words = p - cd->buffer; + } else if (cd->rqstp->rq_respages[pn+1] != NULL) { + /* temporarily encode entry into next page, then move back to + * current and next page in rq_respages[] */ + u32 *p1, *tmp; + int len1, len2; + + /* grab next page for temporary storage of entry */ + p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]); + + p1 = encode_entry_baggage(cd, p1, name, namlen, ino); + + /* throw in readdirplus baggage */ + if (plus) { + struct svc_fh fh; + + if (compose_entry_fh(cd, &fh, name, namlen) > 0) { + /* zero out the filehandle */ + *p1++ = 0; + *p1++ = 0; + } else + p1 = encode_entryplus_baggage(cd, p1, &fh); + } + + /* determine entry word length and lengths to go in pages */ + num_entry_words = p1 - tmp; + len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; + if ((num_entry_words << 2) < len1) { + /* the actual number of words in the entry is less + * than elen and can still fit in the current page + */ + memmove(p, tmp, num_entry_words << 2); + p += num_entry_words; + + /* update offset */ + cd->offset = cd->buffer + (cd->offset - tmp); + } else { + unsigned int offset_r = (cd->offset - tmp) << 2; + + /* update pointer to offset location. + * This is a 64bit quantity, so we need to + * deal with 3 cases: + * - entirely in first page + * - entirely in second page + * - 4 bytes in each page + */ + if (offset_r + 8 <= len1) { + cd->offset = p + (cd->offset - tmp); + } else if (offset_r >= len1) { + cd->offset -= len1 >> 2; + } else { + /* sitting on the fence */ + BUG_ON(offset_r != len1 - 4); + cd->offset = p + (cd->offset - tmp); + cd->offset1 = tmp; + } + + len2 = (num_entry_words << 2) - len1; + + /* move from temp page to current and next pages */ + memmove(p, tmp, len1); + memmove(tmp, (caddr_t)tmp+len1, len2); + + p = tmp + (len2 >> 2); + } + } + else { + cd->common.err = nfserr_toosmall; + return -EINVAL; + } + + cd->buflen -= num_entry_words; + cd->buffer = p; + cd->common.err = nfs_ok; + return 0; + +} + +int +nfs3svc_encode_entry(struct readdir_cd *cd, const char *name, + int namlen, loff_t offset, ino_t ino, unsigned int d_type) +{ + return encode_entry(cd, name, namlen, offset, ino, d_type, 0); +} + +int +nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name, + int namlen, loff_t offset, ino_t ino, unsigned int d_type) +{ + return encode_entry(cd, name, namlen, offset, ino, d_type, 1); +} + +/* FSSTAT */ +int +nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_fsstatres *resp) +{ + struct kstatfs *s = &resp->stats; + u64 bs = s->f_bsize; + + *p++ = xdr_zero; /* no post_op_attr */ + + if (resp->status == 0) { + p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ + p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ + p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ + p = xdr_encode_hyper(p, s->f_files); /* total inodes */ + p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ + p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ + *p++ = htonl(resp->invarsec); /* mean unchanged time */ + } + return xdr_ressize_check(rqstp, p); +} + +/* FSINFO */ +int +nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_fsinfores *resp) +{ + *p++ = xdr_zero; /* no post_op_attr */ + + if (resp->status == 0) { + *p++ = htonl(resp->f_rtmax); + *p++ = htonl(resp->f_rtpref); + *p++ = htonl(resp->f_rtmult); + *p++ = htonl(resp->f_wtmax); + *p++ = htonl(resp->f_wtpref); + *p++ = htonl(resp->f_wtmult); + *p++ = htonl(resp->f_dtpref); + p = xdr_encode_hyper(p, resp->f_maxfilesize); + *p++ = xdr_one; + *p++ = xdr_zero; + *p++ = htonl(resp->f_properties); + } + + return xdr_ressize_check(rqstp, p); +} + +/* PATHCONF */ +int +nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_pathconfres *resp) +{ + *p++ = xdr_zero; /* no post_op_attr */ + + if (resp->status == 0) { + *p++ = htonl(resp->p_link_max); + *p++ = htonl(resp->p_name_max); + *p++ = htonl(resp->p_no_trunc); + *p++ = htonl(resp->p_chown_restricted); + *p++ = htonl(resp->p_case_insensitive); + *p++ = htonl(resp->p_case_preserving); + } + + return xdr_ressize_check(rqstp, p); +} + +/* COMMIT */ +int +nfs3svc_encode_commitres(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_commitres *resp) +{ + p = encode_wcc_data(rqstp, p, &resp->fh); + /* Write verifier */ + if (resp->status == 0) { + *p++ = htonl(nfssvc_boot.tv_sec); + *p++ = htonl(nfssvc_boot.tv_usec); + } + return xdr_ressize_check(rqstp, p); +} + +/* + * XDR release functions + */ +int +nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_attrstat *resp) +{ + fh_put(&resp->fh); + return 1; +} + +int +nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p, + struct nfsd3_fhandle_pair *resp) +{ + fh_put(&resp->fh1); + fh_put(&resp->fh2); + return 1; +} |