diff options
Diffstat (limited to 'fs/nfsd/nfsxdr.c')
-rw-r--r-- | fs/nfsd/nfsxdr.c | 511 |
1 files changed, 511 insertions, 0 deletions
diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c new file mode 100644 index 0000000..948b082 --- /dev/null +++ b/fs/nfsd/nfsxdr.c @@ -0,0 +1,511 @@ +/* + * linux/fs/nfsd/xdr.c + * + * XDR support for nfsd + * + * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/types.h> +#include <linux/time.h> +#include <linux/nfs.h> +#include <linux/vfs.h> +#include <linux/sunrpc/xdr.h> +#include <linux/sunrpc/svc.h> +#include <linux/nfsd/nfsd.h> +#include <linux/nfsd/xdr.h> +#include <linux/mm.h> + +#define NFSDDBG_FACILITY NFSDDBG_XDR + + +#ifdef NFSD_OPTIMIZE_SPACE +# define inline +#endif + +/* + * Mapping of S_IF* types to NFS file types + */ +static u32 nfs_ftypes[] = { + NFNON, NFCHR, NFCHR, NFBAD, + NFDIR, NFBAD, NFBLK, NFBAD, + NFREG, NFBAD, NFLNK, NFBAD, + NFSOCK, NFBAD, NFLNK, NFBAD, +}; + + +/* + * XDR functions for basic NFS types + */ +static inline u32 * +decode_fh(u32 *p, struct svc_fh *fhp) +{ + fh_init(fhp, NFS_FHSIZE); + memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE); + fhp->fh_handle.fh_size = NFS_FHSIZE; + + /* FIXME: Look up export pointer here and verify + * Sun Secure RPC if requested */ + return p + (NFS_FHSIZE >> 2); +} + +static inline u32 * +encode_fh(u32 *p, struct svc_fh *fhp) +{ + memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE); + return p + (NFS_FHSIZE>> 2); +} + +/* + * 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, NFS_MAXNAMLEN)) != NULL) { + for (i = 0, name = *namp; i < *lenp; i++, name++) { + if (*name == '\0' || *name == '/') + return NULL; + } + } + + return p; +} + +static inline u32 * +decode_pathname(u32 *p, char **namp, int *lenp) +{ + char *name; + int i; + + if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) { + for (i = 0, name = *namp; i < *lenp; i++, name++) { + if (*name == '\0') + return NULL; + } + } + + return p; +} + +static inline u32 * +decode_sattr(u32 *p, struct iattr *iap) +{ + u32 tmp, tmp1; + + iap->ia_valid = 0; + + /* Sun client bug compatibility check: some sun clients seem to + * put 0xffff in the mode field when they mean 0xffffffff. + * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah. + */ + if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) { + iap->ia_valid |= ATTR_MODE; + iap->ia_mode = tmp; + } + if ((tmp = ntohl(*p++)) != (u32)-1) { + iap->ia_valid |= ATTR_UID; + iap->ia_uid = tmp; + } + if ((tmp = ntohl(*p++)) != (u32)-1) { + iap->ia_valid |= ATTR_GID; + iap->ia_gid = tmp; + } + if ((tmp = ntohl(*p++)) != (u32)-1) { + iap->ia_valid |= ATTR_SIZE; + iap->ia_size = tmp; + } + tmp = ntohl(*p++); tmp1 = ntohl(*p++); + if (tmp != (u32)-1 && tmp1 != (u32)-1) { + iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; + iap->ia_atime.tv_sec = tmp; + iap->ia_atime.tv_nsec = tmp1 * 1000; + } + tmp = ntohl(*p++); tmp1 = ntohl(*p++); + if (tmp != (u32)-1 && tmp1 != (u32)-1) { + iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; + iap->ia_mtime.tv_sec = tmp; + iap->ia_mtime.tv_nsec = tmp1 * 1000; + /* + * Passing the invalid value useconds=1000000 for mtime + * is a Sun convention for "set both mtime and atime to + * current server time". It's needed to make permissions + * checks for the "touch" program across v2 mounts to + * Solaris and Irix boxes work correctly. See description of + * sattr in section 6.1 of "NFS Illustrated" by + * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5 + */ + if (tmp1 == 1000000) + iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET); + } + return p; +} + +static inline u32 * +encode_fattr(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; + int type; + struct timespec time; + + vfs_getattr(mnt, dentry, &stat); + type = (stat.mode & S_IFMT); + + *p++ = htonl(nfs_ftypes[type >> 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(type) && stat.size > NFS_MAXPATHLEN) { + *p++ = htonl(NFS_MAXPATHLEN); + } else { + *p++ = htonl((u32) stat.size); + } + *p++ = htonl((u32) stat.blksize); + if (S_ISCHR(type) || S_ISBLK(type)) + *p++ = htonl(new_encode_dev(stat.rdev)); + else + *p++ = htonl(0xffffffff); + *p++ = htonl((u32) stat.blocks); + if (is_fsid(fhp, rqstp->rq_reffh)) + *p++ = htonl((u32) fhp->fh_export->ex_fsid); + else + *p++ = htonl(new_encode_dev(stat.dev)); + *p++ = htonl((u32) stat.ino); + *p++ = htonl((u32) stat.atime.tv_sec); + *p++ = htonl(stat.atime.tv_nsec ? stat.atime.tv_nsec / 1000 : 0); + lease_get_mtime(dentry->d_inode, &time); + *p++ = htonl((u32) time.tv_sec); + *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); + *p++ = htonl((u32) stat.ctime.tv_sec); + *p++ = htonl(stat.ctime.tv_nsec ? stat.ctime.tv_nsec / 1000 : 0); + + return p; +} + + +/* + * XDR decode functions + */ +int +nfssvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy) +{ + return xdr_argsize_check(rqstp, p); +} + +int +nfssvc_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 +nfssvc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd_sattrargs *args) +{ + if (!(p = decode_fh(p, &args->fh)) + || !(p = decode_sattr(p, &args->attrs))) + return 0; + + return xdr_argsize_check(rqstp, p); +} + +int +nfssvc_decode_diropargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd_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 +nfssvc_decode_readargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd_readargs *args) +{ + unsigned int len; + int v,pn; + if (!(p = decode_fh(p, &args->fh))) + return 0; + + args->offset = ntohl(*p++); + len = args->count = ntohl(*p++); + p++; /* totalcount - unused */ + + if (len > NFSSVC_MAXBLKSIZE) + len = NFSSVC_MAXBLKSIZE; + + /* set up somewhere to store response. + * We take pages, put them on reslist and include in iovec + */ + 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 +nfssvc_decode_writeargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd_writeargs *args) +{ + unsigned int len; + int v; + if (!(p = decode_fh(p, &args->fh))) + return 0; + + p++; /* beginoffset */ + args->offset = ntohl(*p++); /* offset */ + p++; /* totalcount */ + len = args->len = ntohl(*p++); + args->vec[0].iov_base = (void*)p; + args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - + (((void*)p) - rqstp->rq_arg.head[0].iov_base); + 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->vec[0].iov_len > 0; +} + +int +nfssvc_decode_createargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd_createargs *args) +{ + if (!(p = decode_fh(p, &args->fh)) + || !(p = decode_filename(p, &args->name, &args->len)) + || !(p = decode_sattr(p, &args->attrs))) + return 0; + + return xdr_argsize_check(rqstp, p); +} + +int +nfssvc_decode_renameargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd_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 +nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_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 +nfssvc_decode_linkargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd_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 +nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd_symlinkargs *args) +{ + if (!(p = decode_fh(p, &args->ffh)) + || !(p = decode_filename(p, &args->fname, &args->flen)) + || !(p = decode_pathname(p, &args->tname, &args->tlen)) + || !(p = decode_sattr(p, &args->attrs))) + return 0; + + return xdr_argsize_check(rqstp, p); +} + +int +nfssvc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p, + struct nfsd_readdirargs *args) +{ + if (!(p = decode_fh(p, &args->fh))) + return 0; + args->cookie = ntohl(*p++); + 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); +} + +/* + * XDR encode functions + */ +int +nfssvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy) +{ + return xdr_ressize_check(rqstp, p); +} + +int +nfssvc_encode_attrstat(struct svc_rqst *rqstp, u32 *p, + struct nfsd_attrstat *resp) +{ + p = encode_fattr(rqstp, p, &resp->fh); + return xdr_ressize_check(rqstp, p); +} + +int +nfssvc_encode_diropres(struct svc_rqst *rqstp, u32 *p, + struct nfsd_diropres *resp) +{ + p = encode_fh(p, &resp->fh); + p = encode_fattr(rqstp, p, &resp->fh); + return xdr_ressize_check(rqstp, p); +} + +int +nfssvc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p, + struct nfsd_readlinkres *resp) +{ + *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; +} + +int +nfssvc_encode_readres(struct svc_rqst *rqstp, u32 *p, + struct nfsd_readres *resp) +{ + p = encode_fattr(rqstp, p, &resp->fh); + *p++ = htonl(resp->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; +} + +int +nfssvc_encode_readdirres(struct svc_rqst *rqstp, u32 *p, + struct nfsd_readdirres *resp) +{ + xdr_ressize_check(rqstp, p); + p = resp->buffer; + *p++ = 0; /* no more entries */ + *p++ = htonl((resp->common.err == nfserr_eof)); + rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1; + + return 1; +} + +int +nfssvc_encode_statfsres(struct svc_rqst *rqstp, u32 *p, + struct nfsd_statfsres *resp) +{ + struct kstatfs *stat = &resp->stats; + + *p++ = htonl(NFSSVC_MAXBLKSIZE); /* max transfer size */ + *p++ = htonl(stat->f_bsize); + *p++ = htonl(stat->f_blocks); + *p++ = htonl(stat->f_bfree); + *p++ = htonl(stat->f_bavail); + return xdr_ressize_check(rqstp, p); +} + +int +nfssvc_encode_entry(struct readdir_cd *ccd, const char *name, + int namlen, loff_t offset, ino_t ino, unsigned int d_type) +{ + struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common); + u32 *p = cd->buffer; + int buflen, slen; + + /* + dprintk("nfsd: entry(%.*s off %ld ino %ld)\n", + namlen, name, offset, ino); + */ + + if (offset > ~((u32) 0)) { + cd->common.err = nfserr_fbig; + return -EINVAL; + } + if (cd->offset) + *cd->offset = htonl(offset); + if (namlen > NFS2_MAXNAMLEN) + namlen = NFS2_MAXNAMLEN;/* truncate filename */ + + slen = XDR_QUADLEN(namlen); + if ((buflen = cd->buflen - slen - 4) < 0) { + cd->common.err = nfserr_toosmall; + return -EINVAL; + } + *p++ = xdr_one; /* mark entry present */ + *p++ = htonl((u32) ino); /* file id */ + p = xdr_encode_array(p, name, namlen);/* name length & name */ + cd->offset = p; /* remember pointer */ + *p++ = ~(u32) 0; /* offset of next entry */ + + cd->buflen = buflen; + cd->buffer = p; + cd->common.err = nfs_ok; + return 0; +} + +/* + * XDR release functions + */ +int +nfssvc_release_fhandle(struct svc_rqst *rqstp, u32 *p, + struct nfsd_fhandle *resp) +{ + fh_put(&resp->fh); + return 1; +} |