/* * nfsproc2.c Process version 2 NFS requests. * linux/fs/nfsd/nfs2proc.c * * Process version 2 NFS requests. * * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de> */ #include <linux/linkage.h> #include <linux/time.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/stat.h> #include <linux/fcntl.h> #include <linux/net.h> #include <linux/in.h> #include <linux/namei.h> #include <linux/unistd.h> #include <linux/slab.h> #include <linux/sunrpc/svc.h> #include <linux/nfsd/nfsd.h> #include <linux/nfsd/cache.h> #include <linux/nfsd/xdr.h> typedef struct svc_rqst svc_rqst; typedef struct svc_buf svc_buf; #define NFSDDBG_FACILITY NFSDDBG_PROC static int nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) { return nfs_ok; } static int nfsd_return_attrs(int err, struct nfsd_attrstat *resp) { if (err) return err; return nfserrno(vfs_getattr(resp->fh.fh_export->ex_mnt, resp->fh.fh_dentry, &resp->stat)); } static int nfsd_return_dirop(int err, struct nfsd_diropres *resp) { if (err) return err; return nfserrno(vfs_getattr(resp->fh.fh_export->ex_mnt, resp->fh.fh_dentry, &resp->stat)); } /* * Get a file's attributes * N.B. After this call resp->fh needs an fh_put */ static int nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp, struct nfsd_attrstat *resp) { int nfserr; dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh)); fh_copy(&resp->fh, &argp->fh); nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP); return nfsd_return_attrs(nfserr, resp); } /* * Set a file's attributes * N.B. After this call resp->fh needs an fh_put */ static int nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp, struct nfsd_attrstat *resp) { int nfserr; dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n", SVCFH_fmt(&argp->fh), argp->attrs.ia_valid, (long) argp->attrs.ia_size); fh_copy(&resp->fh, &argp->fh); nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0); return nfsd_return_attrs(nfserr, resp); } /* * Look up a path name component * Note: the dentry in the resp->fh may be negative if the file * doesn't exist yet. * N.B. After this call resp->fh needs an fh_put */ static int nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp, struct nfsd_diropres *resp) { int nfserr; dprintk("nfsd: LOOKUP %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); fh_init(&resp->fh, NFS_FHSIZE); nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len, &resp->fh); fh_put(&argp->fh); return nfsd_return_dirop(nfserr, resp); } /* * Read a symlink. */ static int nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp, struct nfsd_readlinkres *resp) { int nfserr; dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh)); /* Read the symlink. */ resp->len = NFS_MAXPATHLEN; nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len); fh_put(&argp->fh); return nfserr; } /* * Read a portion of a file. * N.B. After this call resp->fh needs an fh_put */ static int nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp, struct nfsd_readres *resp) { int nfserr; dprintk("nfsd: READ %s %d bytes at %d\n", SVCFH_fmt(&argp->fh), argp->count, argp->offset); /* Obtain buffer pointer for payload. 19 is 1 word for * status, 17 words for fattr, and 1 word for the byte count. */ if (NFSSVC_MAXBLKSIZE_V2 < argp->count) { printk(KERN_NOTICE "oversized read request from %u.%u.%u.%u:%d (%d bytes)\n", NIPQUAD(rqstp->rq_addr.sin_addr.s_addr), ntohs(rqstp->rq_addr.sin_port), argp->count); argp->count = NFSSVC_MAXBLKSIZE_V2; } svc_reserve(rqstp, (19<<2) + argp->count + 4); resp->count = argp->count; nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh), NULL, argp->offset, rqstp->rq_vec, argp->vlen, &resp->count); if (nfserr) return nfserr; return nfserrno(vfs_getattr(resp->fh.fh_export->ex_mnt, resp->fh.fh_dentry, &resp->stat)); } /* * Write data to a file * N.B. After this call resp->fh needs an fh_put */ static int nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp, struct nfsd_attrstat *resp) { int nfserr; int stable = 1; dprintk("nfsd: WRITE %s %d bytes at %d\n", SVCFH_fmt(&argp->fh), argp->len, argp->offset); nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL, argp->offset, rqstp->rq_vec, argp->vlen, argp->len, &stable); return nfsd_return_attrs(nfserr, resp); } /* * CREATE processing is complicated. The keyword here is `overloaded.' * The parent directory is kept locked between the check for existence * and the actual create() call in compliance with VFS protocols. * N.B. After this call _both_ argp->fh and resp->fh need an fh_put */ static int nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp, struct nfsd_diropres *resp) { svc_fh *dirfhp = &argp->fh; svc_fh *newfhp = &resp->fh; struct iattr *attr = &argp->attrs; struct inode *inode; struct dentry *dchild; int nfserr, type, mode; dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size); dprintk("nfsd: CREATE %s %.*s\n", SVCFH_fmt(dirfhp), argp->len, argp->name); /* First verify the parent file handle */ nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, MAY_EXEC); if (nfserr) goto done; /* must fh_put dirfhp even on error */ /* Check for MAY_WRITE in nfsd_create if necessary */ nfserr = nfserr_acces; if (!argp->len) goto done; nfserr = nfserr_exist; if (isdotent(argp->name, argp->len)) goto done; fh_lock_nested(dirfhp, I_MUTEX_PARENT); dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len); if (IS_ERR(dchild)) { nfserr = nfserrno(PTR_ERR(dchild)); goto out_unlock; } fh_init(newfhp, NFS_FHSIZE); nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp); if (!nfserr && !dchild->d_inode) nfserr = nfserr_noent; dput(dchild); if (nfserr) { if (nfserr != nfserr_noent) goto out_unlock; /* * If the new file handle wasn't verified, we can't tell * whether the file exists or not. Time to bail ... */ nfserr = nfserr_acces; if (!newfhp->fh_dentry) { printk(KERN_WARNING "nfsd_proc_create: file handle not verified\n"); goto out_unlock; } } inode = newfhp->fh_dentry->d_inode; /* Unfudge the mode bits */ if (attr->ia_valid & ATTR_MODE) { type = attr->ia_mode & S_IFMT; mode = attr->ia_mode & ~S_IFMT; if (!type) { /* no type, so if target exists, assume same as that, * else assume a file */ if (inode) { type = inode->i_mode & S_IFMT; switch(type) { case S_IFCHR: case S_IFBLK: /* reserve rdev for later checking */ rdev = inode->i_rdev; attr->ia_valid |= ATTR_SIZE; /* FALLTHROUGH */ case S_IFIFO: /* this is probably a permission check.. * at least IRIX implements perm checking on * echo thing > device-special-file-or-pipe * by doing a CREATE with type==0 */ nfserr = nfsd_permission(newfhp->fh_export, newfhp->fh_dentry, MAY_WRITE|MAY_LOCAL_ACCESS); if (nfserr && nfserr != nfserr_rofs) goto out_unlock; } } else type = S_IFREG; } } else if (inode) { type = inode->i_mode & S_IFMT; mode = inode->i_mode & ~S_IFMT; } else { type = S_IFREG; mode = 0; /* ??? */ } attr->ia_valid |= ATTR_MODE; attr->ia_mode = mode; /* Special treatment for non-regular files according to the * gospel of sun micro */ if (type != S_IFREG) { int is_borc = 0; if (type != S_IFBLK && type != S_IFCHR) { rdev = 0; } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) { /* If you think you've seen the worst, grok this. */ type = S_IFIFO; } else { /* Okay, char or block special */ is_borc = 1; if (!rdev) rdev = wanted; } /* we've used the SIZE information, so discard it */ attr->ia_valid &= ~ATTR_SIZE; /* Make sure the type and device matches */ nfserr = nfserr_exist; if (inode && type != (inode->i_mode & S_IFMT)) goto out_unlock; } nfserr = 0; if (!inode) { /* File doesn't exist. Create it and set attrs */ nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len, attr, type, rdev, newfhp); } else if (type == S_IFREG) { dprintk("nfsd: existing %s, valid=%x, size=%ld\n", argp->name, attr->ia_valid, (long) attr->ia_size); /* File already exists. We ignore all attributes except * size, so that creat() behaves exactly like * open(..., O_CREAT|O_TRUNC|O_WRONLY). */ attr->ia_valid &= ATTR_SIZE; if (attr->ia_valid) nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0); } out_unlock: /* We don't really need to unlock, as fh_put does it. */ fh_unlock(dirfhp); done: fh_put(dirfhp); return nfsd_return_dirop(nfserr, resp); } static int nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp, void *resp) { int nfserr; dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); /* Unlink. -SIFDIR means file must not be a directory */ nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len); fh_put(&argp->fh); return nfserr; } static int nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp, void *resp) { int nfserr; dprintk("nfsd: RENAME %s %.*s -> \n", SVCFH_fmt(&argp->ffh), argp->flen, argp->fname); dprintk("nfsd: -> %s %.*s\n", SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname); nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen, &argp->tfh, argp->tname, argp->tlen); fh_put(&argp->ffh); fh_put(&argp->tfh); return nfserr; } static int nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp, void *resp) { int nfserr; dprintk("nfsd: LINK %s ->\n", SVCFH_fmt(&argp->ffh)); dprintk("nfsd: %s %.*s\n", SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname); nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen, &argp->ffh); fh_put(&argp->ffh); fh_put(&argp->tfh); return nfserr; } static int nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp, void *resp) { struct svc_fh newfh; int nfserr; dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n", SVCFH_fmt(&argp->ffh), argp->flen, argp->fname, argp->tlen, argp->tname); fh_init(&newfh, NFS_FHSIZE); /* * Create the link, look up new file and set attrs. */ nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen, argp->tname, argp->tlen, &newfh, &argp->attrs); fh_put(&argp->ffh); fh_put(&newfh); return nfserr; } /* * Make directory. This operation is not idempotent. * N.B. After this call resp->fh needs an fh_put */ static int nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp, struct nfsd_diropres *resp) { int nfserr; dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); if (resp->fh.fh_dentry) { printk(KERN_WARNING "nfsd_proc_mkdir: response already verified??\n"); } argp->attrs.ia_valid &= ~ATTR_SIZE; fh_init(&resp->fh, NFS_FHSIZE); nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len, &argp->attrs, S_IFDIR, 0, &resp->fh); fh_put(&argp->fh); return nfsd_return_dirop(nfserr, resp); } /* * Remove a directory */ static int nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp, void *resp) { int nfserr; dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len); fh_put(&argp->fh); return nfserr; } /* * Read a portion of a directory. */ static int nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp, struct nfsd_readdirres *resp) { int nfserr, count; loff_t offset; dprintk("nfsd: READDIR %s %d bytes at %d\n", SVCFH_fmt(&argp->fh), argp->count, argp->cookie); /* Shrink to the client read size */ count = (argp->count >> 2) - 2; /* Make sure we've room for the NULL ptr & eof flag */ count -= 2; if (count < 0) count = 0; resp->buffer = argp->buffer; resp->offset = NULL; resp->buflen = count; resp->common.err = nfs_ok; /* Read directory and encode entries on the fly */ offset = argp->cookie; nfserr = nfsd_readdir(rqstp, &argp->fh, &offset, &resp->common, nfssvc_encode_entry); resp->count = resp->buffer - argp->buffer; if (resp->offset) *resp->offset = htonl(offset); fh_put(&argp->fh); return nfserr; } /* * Get file system info */ static int nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle *argp, struct nfsd_statfsres *resp) { int nfserr; dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh)); nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats); fh_put(&argp->fh); return nfserr; } /* * NFSv2 Server procedures. * Only the results of non-idempotent operations are cached. */ #define nfsd_proc_none NULL #define nfssvc_release_none NULL struct nfsd_void { int dummy; }; #define PROC(name, argt, rest, relt, cache, respsize) \ { (svc_procfunc) nfsd_proc_##name, \ (kxdrproc_t) nfssvc_decode_##argt, \ (kxdrproc_t) nfssvc_encode_##rest, \ (kxdrproc_t) nfssvc_release_##relt, \ sizeof(struct nfsd_##argt), \ sizeof(struct nfsd_##rest), \ 0, \ cache, \ respsize, \ } #define ST 1 /* status */ #define FH 8 /* filehandle */ #define AT 18 /* attributes */ static struct svc_procedure nfsd_procedures2[18] = { PROC(null, void, void, none, RC_NOCACHE, ST), PROC(getattr, fhandle, attrstat, fhandle, RC_NOCACHE, ST+AT), PROC(setattr, sattrargs, attrstat, fhandle, RC_REPLBUFF, ST+AT), PROC(none, void, void, none, RC_NOCACHE, ST), PROC(lookup, diropargs, diropres, fhandle, RC_NOCACHE, ST+FH+AT), PROC(readlink, readlinkargs, readlinkres, none, RC_NOCACHE, ST+1+NFS_MAXPATHLEN/4), PROC(read, readargs, readres, fhandle, RC_NOCACHE, ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4), PROC(none, void, void, none, RC_NOCACHE, ST), PROC(write, writeargs, attrstat, fhandle, RC_REPLBUFF, ST+AT), PROC(create, createargs, diropres, fhandle, RC_REPLBUFF, ST+FH+AT), PROC(remove, diropargs, void, none, RC_REPLSTAT, ST), PROC(rename, renameargs, void, none, RC_REPLSTAT, ST), PROC(link, linkargs, void, none, RC_REPLSTAT, ST), PROC(symlink, symlinkargs, void, none, RC_REPLSTAT, ST), PROC(mkdir, createargs, diropres, fhandle, RC_REPLBUFF, ST+FH+AT), PROC(rmdir, diropargs, void, none, RC_REPLSTAT, ST), PROC(readdir, readdirargs, readdirres, none, RC_NOCACHE, 0), PROC(statfs, fhandle, statfsres, none, RC_NOCACHE, ST+5), }; struct svc_version nfsd_version2 = { .vs_vers = 2, .vs_nproc = 18, .vs_proc = nfsd_procedures2, .vs_dispatch = nfsd_dispatch, .vs_xdrsize = NFS2_SVC_XDRSIZE, }; /* * Map errnos to NFS errnos. */ int nfserrno (int errno) { static struct { int nfserr; int syserr; } nfs_errtbl[] = { { nfs_ok, 0 }, { nfserr_perm, -EPERM }, { nfserr_noent, -ENOENT }, { nfserr_io, -EIO }, { nfserr_nxio, -ENXIO }, { nfserr_acces, -EACCES }, { nfserr_exist, -EEXIST }, { nfserr_xdev, -EXDEV }, { nfserr_mlink, -EMLINK }, { nfserr_nodev, -ENODEV }, { nfserr_notdir, -ENOTDIR }, { nfserr_isdir, -EISDIR }, { nfserr_inval, -EINVAL }, { nfserr_fbig, -EFBIG }, { nfserr_nospc, -ENOSPC }, { nfserr_rofs, -EROFS }, { nfserr_mlink, -EMLINK }, { nfserr_nametoolong, -ENAMETOOLONG }, { nfserr_notempty, -ENOTEMPTY }, #ifdef EDQUOT { nfserr_dquot, -EDQUOT }, #endif { nfserr_stale, -ESTALE }, { nfserr_jukebox, -ETIMEDOUT }, { nfserr_dropit, -EAGAIN }, { nfserr_dropit, -ENOMEM }, { nfserr_badname, -ESRCH }, { nfserr_io, -ETXTBSY }, { nfserr_notsupp, -EOPNOTSUPP }, { -1, -EIO } }; int i; for (i = 0; nfs_errtbl[i].nfserr != -1; i++) { if (nfs_errtbl[i].syserr == errno) return nfs_errtbl[i].nfserr; } printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno); return nfserr_io; }