2 * nfsproc2.c Process version 2 NFS requests.
3 * linux/fs/nfsd/nfs2proc.c
5 * Process version 2 NFS requests.
7 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
10 #include <linux/linkage.h>
11 #include <linux/time.h>
12 #include <linux/errno.h>
14 #include <linux/stat.h>
15 #include <linux/fcntl.h>
16 #include <linux/net.h>
18 #include <linux/namei.h>
19 #include <linux/unistd.h>
20 #include <linux/slab.h>
22 #include <linux/sunrpc/clnt.h>
23 #include <linux/sunrpc/svc.h>
24 #include <linux/nfsd/nfsd.h>
25 #include <linux/nfsd/cache.h>
26 #include <linux/nfsd/xdr.h>
28 typedef struct svc_rqst svc_rqst;
29 typedef struct svc_buf svc_buf;
31 #define NFSDDBG_FACILITY NFSDDBG_PROC
35 nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
41 nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
44 return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
49 nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
52 return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
57 * Get a file's attributes
58 * N.B. After this call resp->fh needs an fh_put
61 nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp,
62 struct nfsd_attrstat *resp)
65 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
67 fh_copy(&resp->fh, &argp->fh);
68 nfserr = fh_verify(rqstp, &resp->fh, 0,
69 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
70 return nfsd_return_attrs(nfserr, resp);
74 * Set a file's attributes
75 * N.B. After this call resp->fh needs an fh_put
78 nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
79 struct nfsd_attrstat *resp)
82 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n",
84 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
86 fh_copy(&resp->fh, &argp->fh);
87 nfserr = nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0);
88 return nfsd_return_attrs(nfserr, resp);
92 * Look up a path name component
93 * Note: the dentry in the resp->fh may be negative if the file
95 * N.B. After this call resp->fh needs an fh_put
98 nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
99 struct nfsd_diropres *resp)
103 dprintk("nfsd: LOOKUP %s %.*s\n",
104 SVCFH_fmt(&argp->fh), argp->len, argp->name);
106 fh_init(&resp->fh, NFS_FHSIZE);
107 nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
111 return nfsd_return_dirop(nfserr, resp);
118 nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
119 struct nfsd_readlinkres *resp)
123 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
125 /* Read the symlink. */
126 resp->len = NFS_MAXPATHLEN;
127 nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
134 * Read a portion of a file.
135 * N.B. After this call resp->fh needs an fh_put
138 nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
139 struct nfsd_readres *resp)
143 dprintk("nfsd: READ %s %d bytes at %d\n",
144 SVCFH_fmt(&argp->fh),
145 argp->count, argp->offset);
147 /* Obtain buffer pointer for payload. 19 is 1 word for
148 * status, 17 words for fattr, and 1 word for the byte count.
151 if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
152 char buf[RPC_MAX_ADDRBUFLEN];
154 "oversized read request from %s (%d bytes)\n",
155 svc_print_addr(rqstp, buf, sizeof(buf)),
157 argp->count = NFSSVC_MAXBLKSIZE_V2;
159 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
161 resp->count = argp->count;
162 nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
164 rqstp->rq_vec, argp->vlen,
167 if (nfserr) return nfserr;
168 return nfserrno(vfs_getattr(resp->fh.fh_export->ex_path.mnt,
174 * Write data to a file
175 * N.B. After this call resp->fh needs an fh_put
178 nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
179 struct nfsd_attrstat *resp)
184 dprintk("nfsd: WRITE %s %d bytes at %d\n",
185 SVCFH_fmt(&argp->fh),
186 argp->len, argp->offset);
188 nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
190 rqstp->rq_vec, argp->vlen,
193 return nfsd_return_attrs(nfserr, resp);
197 * CREATE processing is complicated. The keyword here is `overloaded.'
198 * The parent directory is kept locked between the check for existence
199 * and the actual create() call in compliance with VFS protocols.
200 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
203 nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
204 struct nfsd_diropres *resp)
206 svc_fh *dirfhp = &argp->fh;
207 svc_fh *newfhp = &resp->fh;
208 struct iattr *attr = &argp->attrs;
210 struct dentry *dchild;
213 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
215 dprintk("nfsd: CREATE %s %.*s\n",
216 SVCFH_fmt(dirfhp), argp->len, argp->name);
218 /* First verify the parent file handle */
219 nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
221 goto done; /* must fh_put dirfhp even on error */
223 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
225 nfserr = nfserr_acces;
228 nfserr = nfserr_exist;
229 if (isdotent(argp->name, argp->len))
231 fh_lock_nested(dirfhp, I_MUTEX_PARENT);
232 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
233 if (IS_ERR(dchild)) {
234 nfserr = nfserrno(PTR_ERR(dchild));
237 fh_init(newfhp, NFS_FHSIZE);
238 nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
239 if (!nfserr && !dchild->d_inode)
240 nfserr = nfserr_noent;
243 if (nfserr != nfserr_noent)
246 * If the new file handle wasn't verified, we can't tell
247 * whether the file exists or not. Time to bail ...
249 nfserr = nfserr_acces;
250 if (!newfhp->fh_dentry) {
252 "nfsd_proc_create: file handle not verified\n");
257 inode = newfhp->fh_dentry->d_inode;
259 /* Unfudge the mode bits */
260 if (attr->ia_valid & ATTR_MODE) {
261 type = attr->ia_mode & S_IFMT;
262 mode = attr->ia_mode & ~S_IFMT;
264 /* no type, so if target exists, assume same as that,
265 * else assume a file */
267 type = inode->i_mode & S_IFMT;
271 /* reserve rdev for later checking */
272 rdev = inode->i_rdev;
273 attr->ia_valid |= ATTR_SIZE;
277 /* this is probably a permission check..
278 * at least IRIX implements perm checking on
279 * echo thing > device-special-file-or-pipe
280 * by doing a CREATE with type==0
282 nfserr = nfsd_permission(rqstp,
285 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
286 if (nfserr && nfserr != nfserr_rofs)
293 type = inode->i_mode & S_IFMT;
294 mode = inode->i_mode & ~S_IFMT;
300 attr->ia_valid |= ATTR_MODE;
301 attr->ia_mode = mode;
303 /* Special treatment for non-regular files according to the
304 * gospel of sun micro
306 if (type != S_IFREG) {
308 if (type != S_IFBLK && type != S_IFCHR) {
310 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
311 /* If you think you've seen the worst, grok this. */
314 /* Okay, char or block special */
320 /* we've used the SIZE information, so discard it */
321 attr->ia_valid &= ~ATTR_SIZE;
323 /* Make sure the type and device matches */
324 nfserr = nfserr_exist;
325 if (inode && type != (inode->i_mode & S_IFMT))
331 /* File doesn't exist. Create it and set attrs */
332 nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len,
333 attr, type, rdev, newfhp);
334 } else if (type == S_IFREG) {
335 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
336 argp->name, attr->ia_valid, (long) attr->ia_size);
337 /* File already exists. We ignore all attributes except
338 * size, so that creat() behaves exactly like
339 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
341 attr->ia_valid &= ATTR_SIZE;
343 nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
347 /* We don't really need to unlock, as fh_put does it. */
352 return nfsd_return_dirop(nfserr, resp);
356 nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
361 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
362 argp->len, argp->name);
364 /* Unlink. -SIFDIR means file must not be a directory */
365 nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
371 nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
376 dprintk("nfsd: RENAME %s %.*s -> \n",
377 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
378 dprintk("nfsd: -> %s %.*s\n",
379 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
381 nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
382 &argp->tfh, argp->tname, argp->tlen);
389 nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
394 dprintk("nfsd: LINK %s ->\n",
395 SVCFH_fmt(&argp->ffh));
396 dprintk("nfsd: %s %.*s\n",
397 SVCFH_fmt(&argp->tfh),
401 nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
409 nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
415 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
416 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
417 argp->tlen, argp->tname);
419 fh_init(&newfh, NFS_FHSIZE);
421 * Create the link, look up new file and set attrs.
423 nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
424 argp->tname, argp->tlen,
425 &newfh, &argp->attrs);
434 * Make directory. This operation is not idempotent.
435 * N.B. After this call resp->fh needs an fh_put
438 nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
439 struct nfsd_diropres *resp)
443 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
445 if (resp->fh.fh_dentry) {
447 "nfsd_proc_mkdir: response already verified??\n");
450 argp->attrs.ia_valid &= ~ATTR_SIZE;
451 fh_init(&resp->fh, NFS_FHSIZE);
452 nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
453 &argp->attrs, S_IFDIR, 0, &resp->fh);
455 return nfsd_return_dirop(nfserr, resp);
462 nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
467 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
469 nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
475 * Read a portion of a directory.
478 nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
479 struct nfsd_readdirres *resp)
485 dprintk("nfsd: READDIR %s %d bytes at %d\n",
486 SVCFH_fmt(&argp->fh),
487 argp->count, argp->cookie);
489 /* Shrink to the client read size */
490 count = (argp->count >> 2) - 2;
492 /* Make sure we've room for the NULL ptr & eof flag */
497 resp->buffer = argp->buffer;
499 resp->buflen = count;
500 resp->common.err = nfs_ok;
501 /* Read directory and encode entries on the fly */
502 offset = argp->cookie;
503 nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
504 &resp->common, nfssvc_encode_entry);
506 resp->count = resp->buffer - argp->buffer;
508 *resp->offset = htonl(offset);
515 * Get file system info
518 nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle *argp,
519 struct nfsd_statfsres *resp)
523 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
525 nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
526 NFSD_MAY_BYPASS_GSS_ON_ROOT);
532 * NFSv2 Server procedures.
533 * Only the results of non-idempotent operations are cached.
535 #define nfsd_proc_none NULL
536 #define nfssvc_release_none NULL
537 struct nfsd_void { int dummy; };
539 #define PROC(name, argt, rest, relt, cache, respsize) \
540 { (svc_procfunc) nfsd_proc_##name, \
541 (kxdrproc_t) nfssvc_decode_##argt, \
542 (kxdrproc_t) nfssvc_encode_##rest, \
543 (kxdrproc_t) nfssvc_release_##relt, \
544 sizeof(struct nfsd_##argt), \
545 sizeof(struct nfsd_##rest), \
551 #define ST 1 /* status */
552 #define FH 8 /* filehandle */
553 #define AT 18 /* attributes */
555 static struct svc_procedure nfsd_procedures2[18] = {
556 PROC(null, void, void, none, RC_NOCACHE, ST),
557 PROC(getattr, fhandle, attrstat, fhandle, RC_NOCACHE, ST+AT),
558 PROC(setattr, sattrargs, attrstat, fhandle, RC_REPLBUFF, ST+AT),
559 PROC(none, void, void, none, RC_NOCACHE, ST),
560 PROC(lookup, diropargs, diropres, fhandle, RC_NOCACHE, ST+FH+AT),
561 PROC(readlink, readlinkargs, readlinkres, none, RC_NOCACHE, ST+1+NFS_MAXPATHLEN/4),
562 PROC(read, readargs, readres, fhandle, RC_NOCACHE, ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4),
563 PROC(none, void, void, none, RC_NOCACHE, ST),
564 PROC(write, writeargs, attrstat, fhandle, RC_REPLBUFF, ST+AT),
565 PROC(create, createargs, diropres, fhandle, RC_REPLBUFF, ST+FH+AT),
566 PROC(remove, diropargs, void, none, RC_REPLSTAT, ST),
567 PROC(rename, renameargs, void, none, RC_REPLSTAT, ST),
568 PROC(link, linkargs, void, none, RC_REPLSTAT, ST),
569 PROC(symlink, symlinkargs, void, none, RC_REPLSTAT, ST),
570 PROC(mkdir, createargs, diropres, fhandle, RC_REPLBUFF, ST+FH+AT),
571 PROC(rmdir, diropargs, void, none, RC_REPLSTAT, ST),
572 PROC(readdir, readdirargs, readdirres, none, RC_NOCACHE, 0),
573 PROC(statfs, fhandle, statfsres, none, RC_NOCACHE, ST+5),
577 struct svc_version nfsd_version2 = {
580 .vs_proc = nfsd_procedures2,
581 .vs_dispatch = nfsd_dispatch,
582 .vs_xdrsize = NFS2_SVC_XDRSIZE,
586 * Map errnos to NFS errnos.
596 { nfserr_perm, -EPERM },
597 { nfserr_noent, -ENOENT },
599 { nfserr_nxio, -ENXIO },
600 { nfserr_acces, -EACCES },
601 { nfserr_exist, -EEXIST },
602 { nfserr_xdev, -EXDEV },
603 { nfserr_mlink, -EMLINK },
604 { nfserr_nodev, -ENODEV },
605 { nfserr_notdir, -ENOTDIR },
606 { nfserr_isdir, -EISDIR },
607 { nfserr_inval, -EINVAL },
608 { nfserr_fbig, -EFBIG },
609 { nfserr_nospc, -ENOSPC },
610 { nfserr_rofs, -EROFS },
611 { nfserr_mlink, -EMLINK },
612 { nfserr_nametoolong, -ENAMETOOLONG },
613 { nfserr_notempty, -ENOTEMPTY },
615 { nfserr_dquot, -EDQUOT },
617 { nfserr_stale, -ESTALE },
618 { nfserr_jukebox, -ETIMEDOUT },
619 { nfserr_jukebox, -ERESTARTSYS },
620 { nfserr_dropit, -EAGAIN },
621 { nfserr_dropit, -ENOMEM },
622 { nfserr_badname, -ESRCH },
623 { nfserr_io, -ETXTBSY },
624 { nfserr_notsupp, -EOPNOTSUPP },
625 { nfserr_toosmall, -ETOOSMALL },
629 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
630 if (nfs_errtbl[i].syserr == errno)
631 return nfs_errtbl[i].nfserr;
633 printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno);