/* * linux/fs/nfsd/nfs3proc.c * * Process version 3 NFS requests. * * Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de> */ #include <linux/linkage.h> #include <linux/time.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/ext2_fs.h> #include <linux/stat.h> #include <linux/fcntl.h> #include <linux/net.h> #include <linux/in.h> #include <linux/unistd.h> #include <linux/slab.h> #include <linux/major.h> #include <linux/sunrpc/svc.h> #include <linux/nfsd/nfsd.h> #include <linux/nfsd/cache.h> #include <linux/nfsd/xdr3.h> #include <linux/nfs3.h> #define NFSDDBG_FACILITY NFSDDBG_PROC #define RETURN_STATUS(st) { resp->status = (st); return (st); } static int nfs3_ftypes[] = { 0, /* NF3NON */ S_IFREG, /* NF3REG */ S_IFDIR, /* NF3DIR */ S_IFBLK, /* NF3BLK */ S_IFCHR, /* NF3CHR */ S_IFLNK, /* NF3LNK */ S_IFSOCK, /* NF3SOCK */ S_IFIFO, /* NF3FIFO */ }; /* * NULL call. */ static __be32 nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) { return nfs_ok; } /* * Get a file's attributes */ static __be32 nfsd3_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp, struct nfsd3_attrstat *resp) { int err; __be32 nfserr; dprintk("nfsd: GETATTR(3) %s\n", SVCFH_fmt(&argp->fh)); fh_copy(&resp->fh, &argp->fh); nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP); if (nfserr) RETURN_STATUS(nfserr); err = vfs_getattr(resp->fh.fh_export->ex_path.mnt, resp->fh.fh_dentry, &resp->stat); nfserr = nfserrno(err); RETURN_STATUS(nfserr); } /* * Set a file's attributes */ static __be32 nfsd3_proc_setattr(struct svc_rqst *rqstp, struct nfsd3_sattrargs *argp, struct nfsd3_attrstat *resp) { __be32 nfserr; dprintk("nfsd: SETATTR(3) %s\n", SVCFH_fmt(&argp->fh)); fh_copy(&resp->fh, &argp->fh); nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs, argp->check_guard, argp->guardtime); RETURN_STATUS(nfserr); } /* * Look up a path name component */ static __be32 nfsd3_proc_lookup(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp, struct nfsd3_diropres *resp) { __be32 nfserr; dprintk("nfsd: LOOKUP(3) %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); fh_copy(&resp->dirfh, &argp->fh); fh_init(&resp->fh, NFS3_FHSIZE); nfserr = nfsd_lookup(rqstp, &resp->dirfh, argp->name, argp->len, &resp->fh); RETURN_STATUS(nfserr); } /* * Check file access */ static __be32 nfsd3_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp, struct nfsd3_accessres *resp) { __be32 nfserr; dprintk("nfsd: ACCESS(3) %s 0x%x\n", SVCFH_fmt(&argp->fh), argp->access); fh_copy(&resp->fh, &argp->fh); resp->access = argp->access; nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL); RETURN_STATUS(nfserr); } /* * Read a symlink. */ static __be32 nfsd3_proc_readlink(struct svc_rqst *rqstp, struct nfsd3_readlinkargs *argp, struct nfsd3_readlinkres *resp) { __be32 nfserr; dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh)); /* Read the symlink. */ fh_copy(&resp->fh, &argp->fh); resp->len = NFS3_MAXPATHLEN; nfserr = nfsd_readlink(rqstp, &resp->fh, argp->buffer, &resp->len); RETURN_STATUS(nfserr); } /* * Read a portion of a file. */ static __be32 nfsd3_proc_read(struct svc_rqst *rqstp, struct nfsd3_readargs *argp, struct nfsd3_readres *resp) { __be32 nfserr; u32 max_blocksize = svc_max_payload(rqstp); dprintk("nfsd: READ(3) %s %lu bytes at %lu\n", SVCFH_fmt(&argp->fh), (unsigned long) argp->count, (unsigned long) argp->offset); /* Obtain buffer pointer for payload. * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof) * + 1 (xdr opaque byte count) = 26 */ resp->count = argp->count; if (max_blocksize < resp->count) resp->count = max_blocksize; svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4); fh_copy(&resp->fh, &argp->fh); nfserr = nfsd_read(rqstp, &resp->fh, NULL, argp->offset, rqstp->rq_vec, argp->vlen, &resp->count); if (nfserr == 0) { struct inode *inode = resp->fh.fh_dentry->d_inode; resp->eof = (argp->offset + resp->count) >= inode->i_size; } RETURN_STATUS(nfserr); } /* * Write data to a file */ static __be32 nfsd3_proc_write(struct svc_rqst *rqstp, struct nfsd3_writeargs *argp, struct nfsd3_writeres *resp) { __be32 nfserr; dprintk("nfsd: WRITE(3) %s %d bytes at %ld%s\n", SVCFH_fmt(&argp->fh), argp->len, (unsigned long) argp->offset, argp->stable? " stable" : ""); fh_copy(&resp->fh, &argp->fh); resp->committed = argp->stable; nfserr = nfsd_write(rqstp, &resp->fh, NULL, argp->offset, rqstp->rq_vec, argp->vlen, argp->len, &resp->committed); resp->count = argp->count; RETURN_STATUS(nfserr); } /* * With NFSv3, CREATE processing is a lot easier than with NFSv2. * At least in theory; we'll see how it fares in practice when the * first reports about SunOS compatibility problems start to pour in... */ static __be32 nfsd3_proc_create(struct svc_rqst *rqstp, struct nfsd3_createargs *argp, struct nfsd3_diropres *resp) { svc_fh *dirfhp, *newfhp = NULL; struct iattr *attr; __be32 nfserr; dprintk("nfsd: CREATE(3) %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); dirfhp = fh_copy(&resp->dirfh, &argp->fh); newfhp = fh_init(&resp->fh, NFS3_FHSIZE); attr = &argp->attrs; /* Get the directory inode */ nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, MAY_CREATE); if (nfserr) RETURN_STATUS(nfserr); /* Unfudge the mode bits */ attr->ia_mode &= ~S_IFMT; if (!(attr->ia_valid & ATTR_MODE)) { attr->ia_valid |= ATTR_MODE; attr->ia_mode = S_IFREG; } else { attr->ia_mode = (attr->ia_mode & ~S_IFMT) | S_IFREG; } /* Now create the file and set attributes */ nfserr = nfsd_create_v3(rqstp, dirfhp, argp->name, argp->len, attr, newfhp, argp->createmode, argp->verf, NULL, NULL); RETURN_STATUS(nfserr); } /* * Make directory. This operation is not idempotent. */ static __be32 nfsd3_proc_mkdir(struct svc_rqst *rqstp, struct nfsd3_createargs *argp, struct nfsd3_diropres *resp) { __be32 nfserr; dprintk("nfsd: MKDIR(3) %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); argp->attrs.ia_valid &= ~ATTR_SIZE; fh_copy(&resp->dirfh, &argp->fh); fh_init(&resp->fh, NFS3_FHSIZE); nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len, &argp->attrs, S_IFDIR, 0, &resp->fh); RETURN_STATUS(nfserr); } static __be32 nfsd3_proc_symlink(struct svc_rqst *rqstp, struct nfsd3_symlinkargs *argp, struct nfsd3_diropres *resp) { __be32 nfserr; dprintk("nfsd: SYMLINK(3) %s %.*s -> %.*s\n", SVCFH_fmt(&argp->ffh), argp->flen, argp->fname, argp->tlen, argp->tname); fh_copy(&resp->dirfh, &argp->ffh); fh_init(&resp->fh, NFS3_FHSIZE); nfserr = nfsd_symlink(rqstp, &resp->dirfh, argp->fname, argp->flen, argp->tname, argp->tlen, &resp->fh, &argp->attrs); RETURN_STATUS(nfserr); } /* * Make socket/fifo/device. */ static __be32 nfsd3_proc_mknod(struct svc_rqst *rqstp, struct nfsd3_mknodargs *argp, struct nfsd3_diropres *resp) { __be32 nfserr; int type; dev_t rdev = 0; dprintk("nfsd: MKNOD(3) %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); fh_copy(&resp->dirfh, &argp->fh); fh_init(&resp->fh, NFS3_FHSIZE); if (argp->ftype == 0 || argp->ftype >= NF3BAD) RETURN_STATUS(nfserr_inval); if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) { rdev = MKDEV(argp->major, argp->minor); if (MAJOR(rdev) != argp->major || MINOR(rdev) != argp->minor) RETURN_STATUS(nfserr_inval); } else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) RETURN_STATUS(nfserr_inval); type = nfs3_ftypes[argp->ftype]; nfserr = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len, &argp->attrs, type, rdev, &resp->fh); RETURN_STATUS(nfserr); } /* * Remove file/fifo/socket etc. */ static __be32 nfsd3_proc_remove(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp, struct nfsd3_attrstat *resp) { __be32 nfserr; dprintk("nfsd: REMOVE(3) %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); /* Unlink. -S_IFDIR means file must not be a directory */ fh_copy(&resp->fh, &argp->fh); nfserr = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR, argp->name, argp->len); RETURN_STATUS(nfserr); } /* * Remove a directory */ static __be32 nfsd3_proc_rmdir(struct svc_rqst *rqstp, struct nfsd3_diropargs *argp, struct nfsd3_attrstat *resp) { __be32 nfserr; dprintk("nfsd: RMDIR(3) %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); fh_copy(&resp->fh, &argp->fh); nfserr = nfsd_unlink(rqstp, &resp->fh, S_IFDIR, argp->name, argp->len); RETURN_STATUS(nfserr); } static __be32 nfsd3_proc_rename(struct svc_rqst *rqstp, struct nfsd3_renameargs *argp, struct nfsd3_renameres *resp) { __be32 nfserr; dprintk("nfsd: RENAME(3) %s %.*s ->\n", SVCFH_fmt(&argp->ffh), argp->flen, argp->fname); dprintk("nfsd: -> %s %.*s\n", SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname); fh_copy(&resp->ffh, &argp->ffh); fh_copy(&resp->tfh, &argp->tfh); nfserr = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen, &resp->tfh, argp->tname, argp->tlen); RETURN_STATUS(nfserr); } static __be32 nfsd3_proc_link(struct svc_rqst *rqstp, struct nfsd3_linkargs *argp, struct nfsd3_linkres *resp) { __be32 nfserr; dprintk("nfsd: LINK(3) %s ->\n", SVCFH_fmt(&argp->ffh)); dprintk("nfsd: -> %s %.*s\n", SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname); fh_copy(&resp->fh, &argp->ffh); fh_copy(&resp->tfh, &argp->tfh); nfserr = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen, &resp->fh); RETURN_STATUS(nfserr); } /* * Read a portion of a directory. */ static __be32 nfsd3_proc_readdir(struct svc_rqst *rqstp, struct nfsd3_readdirargs *argp, struct nfsd3_readdirres *resp) { __be32 nfserr; int count; dprintk("nfsd: READDIR(3) %s %d bytes at %d\n", SVCFH_fmt(&argp->fh), argp->count, (u32) argp->cookie); /* Make sure we've room for the NULL ptr & eof flag, and shrink to * client read size */ count = (argp->count >> 2) - 2; /* Read directory and encode entries on the fly */ fh_copy(&resp->fh, &argp->fh); resp->buflen = count; resp->common.err = nfs_ok; resp->buffer = argp->buffer; resp->rqstp = rqstp; nfserr = nfsd_readdir(rqstp, &resp->fh, (loff_t*) &argp->cookie, &resp->common, nfs3svc_encode_entry); memcpy(resp->verf, argp->verf, 8); resp->count = resp->buffer - argp->buffer; if (resp->offset) xdr_encode_hyper(resp->offset, argp->cookie); RETURN_STATUS(nfserr); } /* * Read a portion of a directory, including file handles and attrs. * For now, we choose to ignore the dircount parameter. */ static __be32 nfsd3_proc_readdirplus(struct svc_rqst *rqstp, struct nfsd3_readdirargs *argp, struct nfsd3_readdirres *resp) { __be32 nfserr; int count = 0; loff_t offset; int i; caddr_t page_addr = NULL; dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n", SVCFH_fmt(&argp->fh), argp->count, (u32) argp->cookie); /* Convert byte count to number of words (i.e. >> 2), * and reserve room for the NULL ptr & eof flag (-2 words) */ resp->count = (argp->count >> 2) - 2; /* Read directory and encode entries on the fly */ fh_copy(&resp->fh, &argp->fh); resp->common.err = nfs_ok; resp->buffer = argp->buffer; resp->buflen = resp->count; resp->rqstp = rqstp; offset = argp->cookie; nfserr = nfsd_readdir(rqstp, &resp->fh, &offset, &resp->common, nfs3svc_encode_entry_plus); memcpy(resp->verf, argp->verf, 8); for (i=1; i<rqstp->rq_resused ; i++) { page_addr = page_address(rqstp->rq_respages[i]); if (((caddr_t)resp->buffer >= page_addr) && ((caddr_t)resp->buffer < page_addr + PAGE_SIZE)) { count += (caddr_t)resp->buffer - page_addr; break; } count += PAGE_SIZE; } resp->count = count >> 2; if (resp->offset) { if (unlikely(resp->offset1)) { /* we ended up with offset on a page boundary */ *resp->offset = htonl(offset >> 32); *resp->offset1 = htonl(offset & 0xffffffff); resp->offset1 = NULL; } else { xdr_encode_hyper(resp->offset, offset); } } RETURN_STATUS(nfserr); } /* * Get file system stats */ static __be32 nfsd3_proc_fsstat(struct svc_rqst * rqstp, struct nfsd_fhandle *argp, struct nfsd3_fsstatres *resp) { __be32 nfserr; dprintk("nfsd: FSSTAT(3) %s\n", SVCFH_fmt(&argp->fh)); nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats); fh_put(&argp->fh); RETURN_STATUS(nfserr); } /* * Get file system info */ static __be32 nfsd3_proc_fsinfo(struct svc_rqst * rqstp, struct nfsd_fhandle *argp, struct nfsd3_fsinfores *resp) { __be32 nfserr; u32 max_blocksize = svc_max_payload(rqstp); dprintk("nfsd: FSINFO(3) %s\n", SVCFH_fmt(&argp->fh)); resp->f_rtmax = max_blocksize; resp->f_rtpref = max_blocksize; resp->f_rtmult = PAGE_SIZE; resp->f_wtmax = max_blocksize; resp->f_wtpref = max_blocksize; resp->f_wtmult = PAGE_SIZE; resp->f_dtpref = PAGE_SIZE; resp->f_maxfilesize = ~(u32) 0; resp->f_properties = NFS3_FSF_DEFAULT; nfserr = fh_verify(rqstp, &argp->fh, 0, MAY_NOP); /* Check special features of the file system. May request * different read/write sizes for file systems known to have * problems with large blocks */ if (nfserr == 0) { struct super_block *sb = argp->fh.fh_dentry->d_inode->i_sb; /* Note that we don't care for remote fs's here */ if (sb->s_magic == 0x4d44 /* MSDOS_SUPER_MAGIC */) { resp->f_properties = NFS3_FSF_BILLYBOY; } resp->f_maxfilesize = sb->s_maxbytes; } fh_put(&argp->fh); RETURN_STATUS(nfserr); } /* * Get pathconf info for the specified file */ static __be32 nfsd3_proc_pathconf(struct svc_rqst * rqstp, struct nfsd_fhandle *argp, struct nfsd3_pathconfres *resp) { __be32 nfserr; dprintk("nfsd: PATHCONF(3) %s\n", SVCFH_fmt(&argp->fh)); /* Set default pathconf */ resp->p_link_max = 255; /* at least */ resp->p_name_max = 255; /* at least */ resp->p_no_trunc = 0; resp->p_chown_restricted = 1; resp->p_case_insensitive = 0; resp->p_case_preserving = 1; nfserr = fh_verify(rqstp, &argp->fh, 0, MAY_NOP); if (nfserr == 0) { struct super_block *sb = argp->fh.fh_dentry->d_inode->i_sb; /* Note that we don't care for remote fs's here */ switch (sb->s_magic) { case EXT2_SUPER_MAGIC: resp->p_link_max = EXT2_LINK_MAX; resp->p_name_max = EXT2_NAME_LEN; break; case 0x4d44: /* MSDOS_SUPER_MAGIC */ resp->p_case_insensitive = 1; resp->p_case_preserving = 0; break; } } fh_put(&argp->fh); RETURN_STATUS(nfserr); } /* * Commit a file (range) to stable storage. */ static __be32 nfsd3_proc_commit(struct svc_rqst * rqstp, struct nfsd3_commitargs *argp, struct nfsd3_commitres *resp) { __be32 nfserr; dprintk("nfsd: COMMIT(3) %s %u@%Lu\n", SVCFH_fmt(&argp->fh), argp->count, (unsigned long long) argp->offset); if (argp->offset > NFS_OFFSET_MAX) RETURN_STATUS(nfserr_inval); fh_copy(&resp->fh, &argp->fh); nfserr = nfsd_commit(rqstp, &resp->fh, argp->offset, argp->count); RETURN_STATUS(nfserr); } /* * NFSv3 Server procedures. * Only the results of non-idempotent operations are cached. */ #define nfs3svc_decode_voidargs NULL #define nfs3svc_release_void NULL #define nfs3svc_decode_fhandleargs nfs3svc_decode_fhandle #define nfs3svc_encode_attrstatres nfs3svc_encode_attrstat #define nfs3svc_encode_wccstatres nfs3svc_encode_wccstat #define nfsd3_mkdirargs nfsd3_createargs #define nfsd3_readdirplusargs nfsd3_readdirargs #define nfsd3_fhandleargs nfsd_fhandle #define nfsd3_fhandleres nfsd3_attrstat #define nfsd3_attrstatres nfsd3_attrstat #define nfsd3_wccstatres nfsd3_attrstat #define nfsd3_createres nfsd3_diropres #define nfsd3_voidres nfsd3_voidargs struct nfsd3_voidargs { int dummy; }; #define PROC(name, argt, rest, relt, cache, respsize) \ { (svc_procfunc) nfsd3_proc_##name, \ (kxdrproc_t) nfs3svc_decode_##argt##args, \ (kxdrproc_t) nfs3svc_encode_##rest##res, \ (kxdrproc_t) nfs3svc_release_##relt, \ sizeof(struct nfsd3_##argt##args), \ sizeof(struct nfsd3_##rest##res), \ 0, \ cache, \ respsize, \ } #define ST 1 /* status*/ #define FH 17 /* filehandle with length */ #define AT 21 /* attributes */ #define pAT (1+AT) /* post attributes - conditional */ #define WC (7+pAT) /* WCC attributes */ static struct svc_procedure nfsd_procedures3[22] = { PROC(null, void, void, void, RC_NOCACHE, ST), PROC(getattr, fhandle, attrstat, fhandle, RC_NOCACHE, ST+AT), PROC(setattr, sattr, wccstat, fhandle, RC_REPLBUFF, ST+WC), PROC(lookup, dirop, dirop, fhandle2, RC_NOCACHE, ST+FH+pAT+pAT), PROC(access, access, access, fhandle, RC_NOCACHE, ST+pAT+1), PROC(readlink, readlink, readlink, fhandle, RC_NOCACHE, ST+pAT+1+NFS3_MAXPATHLEN/4), PROC(read, read, read, fhandle, RC_NOCACHE, ST+pAT+4+NFSSVC_MAXBLKSIZE/4), PROC(write, write, write, fhandle, RC_REPLBUFF, ST+WC+4), PROC(create, create, create, fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC), PROC(mkdir, mkdir, create, fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC), PROC(symlink, symlink, create, fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC), PROC(mknod, mknod, create, fhandle2, RC_REPLBUFF, ST+(1+FH+pAT)+WC), PROC(remove, dirop, wccstat, fhandle, RC_REPLBUFF, ST+WC), PROC(rmdir, dirop, wccstat, fhandle, RC_REPLBUFF, ST+WC), PROC(rename, rename, rename, fhandle2, RC_REPLBUFF, ST+WC+WC), PROC(link, link, link, fhandle2, RC_REPLBUFF, ST+pAT+WC), PROC(readdir, readdir, readdir, fhandle, RC_NOCACHE, 0), PROC(readdirplus,readdirplus, readdir, fhandle, RC_NOCACHE, 0), PROC(fsstat, fhandle, fsstat, void, RC_NOCACHE, ST+pAT+2*6+1), PROC(fsinfo, fhandle, fsinfo, void, RC_NOCACHE, ST+pAT+12), PROC(pathconf, fhandle, pathconf, void, RC_NOCACHE, ST+pAT+6), PROC(commit, commit, commit, fhandle, RC_NOCACHE, ST+WC+2), }; struct svc_version nfsd_version3 = { .vs_vers = 3, .vs_nproc = 22, .vs_proc = nfsd_procedures3, .vs_dispatch = nfsd_dispatch, .vs_xdrsize = NFS3_SVC_XDRSIZE, };