blob: 536009e503871009c406faaac64c5569b8a9cdb6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Process version 2 NFS requests.
3 *
4 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
5 */
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/namei.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008
Boaz Harrosh9a74af22009-12-03 20:30:56 +02009#include "cache.h"
10#include "xdr.h"
J. Bruce Fields0a3adad2009-11-04 18:12:35 -050011#include "vfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070012
13typedef struct svc_rqst svc_rqst;
14typedef struct svc_buf svc_buf;
15
16#define NFSDDBG_FACILITY NFSDDBG_PROC
17
18
Al Viro7111c662006-10-19 23:28:45 -070019static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -070020nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
21{
22 return nfs_ok;
23}
24
Al Viroc4d987b2006-10-19 23:29:00 -070025static __be32
26nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
David Shaw846f2fc2006-01-18 17:43:51 -080027{
28 if (err) return err;
Al Viro3dadecc2013-01-24 02:18:08 -050029 return fh_getattr(&resp->fh, &resp->stat);
David Shaw846f2fc2006-01-18 17:43:51 -080030}
Al Viroc4d987b2006-10-19 23:29:00 -070031static __be32
32nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
David Shaw846f2fc2006-01-18 17:43:51 -080033{
34 if (err) return err;
Al Viro3dadecc2013-01-24 02:18:08 -050035 return fh_getattr(&resp->fh, &resp->stat);
David Shaw846f2fc2006-01-18 17:43:51 -080036}
Linus Torvalds1da177e2005-04-16 15:20:36 -070037/*
38 * Get a file's attributes
39 * N.B. After this call resp->fh needs an fh_put
40 */
Al Viro7111c662006-10-19 23:28:45 -070041static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -070042nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp,
43 struct nfsd_attrstat *resp)
44{
Al Viroc4d987b2006-10-19 23:29:00 -070045 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
47
48 fh_copy(&resp->fh, &argp->fh);
J. Bruce Fields04716e62008-08-07 13:00:20 -040049 nfserr = fh_verify(rqstp, &resp->fh, 0,
50 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
David Shaw846f2fc2006-01-18 17:43:51 -080051 return nfsd_return_attrs(nfserr, resp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052}
53
54/*
55 * Set a file's attributes
56 * N.B. After this call resp->fh needs an fh_put
57 */
Al Viro7111c662006-10-19 23:28:45 -070058static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -070059nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp,
60 struct nfsd_attrstat *resp)
61{
Andreas Gruenbachercc265082015-05-09 00:37:57 +020062 struct iattr *iap = &argp->attrs;
63 struct svc_fh *fhp;
Al Viroc4d987b2006-10-19 23:29:00 -070064 __be32 nfserr;
Andreas Gruenbachercc265082015-05-09 00:37:57 +020065
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n",
67 SVCFH_fmt(&argp->fh),
68 argp->attrs.ia_valid, (long) argp->attrs.ia_size);
69
Andreas Gruenbachercc265082015-05-09 00:37:57 +020070 fhp = fh_copy(&resp->fh, &argp->fh);
71
72 /*
73 * NFSv2 does not differentiate between "set-[ac]time-to-now"
74 * which only requires access, and "set-[ac]time-to-X" which
75 * requires ownership.
76 * So if it looks like it might be "set both to the same time which
Jan Kara31051c82016-05-26 16:55:18 +020077 * is close to now", and if setattr_prepare fails, then we
Andreas Gruenbachercc265082015-05-09 00:37:57 +020078 * convert to "set to now" instead of "set to explicit time"
79 *
Jan Kara31051c82016-05-26 16:55:18 +020080 * We only call setattr_prepare as the last test as technically
Andreas Gruenbachercc265082015-05-09 00:37:57 +020081 * it is not an interface that we should be using.
82 */
83#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
84#define MAX_TOUCH_TIME_ERROR (30*60)
85 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
86 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
87 /*
88 * Looks probable.
89 *
90 * Now just make sure time is in the right ballpark.
91 * Solaris, at least, doesn't seem to care what the time
92 * request is. We require it be within 30 minutes of now.
93 */
94 time_t delta = iap->ia_atime.tv_sec - get_seconds();
Andreas Gruenbachercc265082015-05-09 00:37:57 +020095
96 nfserr = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
97 if (nfserr)
98 goto done;
Andreas Gruenbachercc265082015-05-09 00:37:57 +020099
100 if (delta < 0)
101 delta = -delta;
102 if (delta < MAX_TOUCH_TIME_ERROR &&
Jan Kara31051c82016-05-26 16:55:18 +0200103 setattr_prepare(fhp->fh_dentry, iap) != 0) {
Andreas Gruenbachercc265082015-05-09 00:37:57 +0200104 /*
105 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
106 * This will cause notify_change to set these times
107 * to "now"
108 */
109 iap->ia_valid &= ~BOTH_TIME_SET;
110 }
111 }
112
113 nfserr = nfsd_setattr(rqstp, fhp, iap, 0, (time_t)0);
114done:
David Shaw846f2fc2006-01-18 17:43:51 -0800115 return nfsd_return_attrs(nfserr, resp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
117
118/*
119 * Look up a path name component
120 * Note: the dentry in the resp->fh may be negative if the file
121 * doesn't exist yet.
122 * N.B. After this call resp->fh needs an fh_put
123 */
Al Viro7111c662006-10-19 23:28:45 -0700124static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
126 struct nfsd_diropres *resp)
127{
Al Viroc4d987b2006-10-19 23:29:00 -0700128 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130 dprintk("nfsd: LOOKUP %s %.*s\n",
131 SVCFH_fmt(&argp->fh), argp->len, argp->name);
132
133 fh_init(&resp->fh, NFS_FHSIZE);
134 nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len,
135 &resp->fh);
136
137 fh_put(&argp->fh);
David Shaw846f2fc2006-01-18 17:43:51 -0800138 return nfsd_return_dirop(nfserr, resp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139}
140
141/*
142 * Read a symlink.
143 */
Al Viro7111c662006-10-19 23:28:45 -0700144static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp,
146 struct nfsd_readlinkres *resp)
147{
Al Viroc4d987b2006-10-19 23:29:00 -0700148 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
150 dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh));
151
152 /* Read the symlink. */
153 resp->len = NFS_MAXPATHLEN;
154 nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len);
155
156 fh_put(&argp->fh);
157 return nfserr;
158}
159
160/*
161 * Read a portion of a file.
162 * N.B. After this call resp->fh needs an fh_put
163 */
Al Viro7111c662006-10-19 23:28:45 -0700164static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp,
166 struct nfsd_readres *resp)
167{
Al Viroc4d987b2006-10-19 23:29:00 -0700168 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 dprintk("nfsd: READ %s %d bytes at %d\n",
171 SVCFH_fmt(&argp->fh),
172 argp->count, argp->offset);
173
174 /* Obtain buffer pointer for payload. 19 is 1 word for
175 * status, 17 words for fattr, and 1 word for the byte count.
176 */
177
Greg Banks7adae482006-10-04 02:15:47 -0700178 if (NFSSVC_MAXBLKSIZE_V2 < argp->count) {
Chuck Leverad06e4b2007-02-12 00:53:32 -0800179 char buf[RPC_MAX_ADDRBUFLEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 printk(KERN_NOTICE
Chuck Leverad06e4b2007-02-12 00:53:32 -0800181 "oversized read request from %s (%d bytes)\n",
182 svc_print_addr(rqstp, buf, sizeof(buf)),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 argp->count);
Greg Banks7adae482006-10-04 02:15:47 -0700184 argp->count = NFSSVC_MAXBLKSIZE_V2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
Jeff Laytoncd123012007-05-09 02:34:50 -0700186 svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188 resp->count = argp->count;
J. Bruce Fields039a87c2010-07-30 11:33:32 -0400189 nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 argp->offset,
NeilBrown3cc03b12006-10-04 02:15:47 -0700191 rqstp->rq_vec, argp->vlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 &resp->count);
193
David Shaw846f2fc2006-01-18 17:43:51 -0800194 if (nfserr) return nfserr;
Al Viro3dadecc2013-01-24 02:18:08 -0500195 return fh_getattr(&resp->fh, &resp->stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196}
197
198/*
199 * Write data to a file
200 * N.B. After this call resp->fh needs an fh_put
201 */
Al Viro7111c662006-10-19 23:28:45 -0700202static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
204 struct nfsd_attrstat *resp)
205{
Al Viroc4d987b2006-10-19 23:29:00 -0700206 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 int stable = 1;
David Shaw31dec252009-03-05 20:16:14 -0500208 unsigned long cnt = argp->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 dprintk("nfsd: WRITE %s %d bytes at %d\n",
211 SVCFH_fmt(&argp->fh),
212 argp->len, argp->offset);
213
214 nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL,
215 argp->offset,
NeilBrown3cc03b12006-10-04 02:15:47 -0700216 rqstp->rq_vec, argp->vlen,
David Shaw31dec252009-03-05 20:16:14 -0500217 &cnt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 &stable);
David Shaw846f2fc2006-01-18 17:43:51 -0800219 return nfsd_return_attrs(nfserr, resp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220}
221
222/*
223 * CREATE processing is complicated. The keyword here is `overloaded.'
224 * The parent directory is kept locked between the check for existence
225 * and the actual create() call in compliance with VFS protocols.
226 * N.B. After this call _both_ argp->fh and resp->fh need an fh_put
227 */
Al Viro7111c662006-10-19 23:28:45 -0700228static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
230 struct nfsd_diropres *resp)
231{
232 svc_fh *dirfhp = &argp->fh;
233 svc_fh *newfhp = &resp->fh;
234 struct iattr *attr = &argp->attrs;
235 struct inode *inode;
236 struct dentry *dchild;
Al Viroc4d987b2006-10-19 23:29:00 -0700237 int type, mode;
238 __be32 nfserr;
Jan Kara4a55c102012-06-12 16:20:33 +0200239 int hosterr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size);
241
242 dprintk("nfsd: CREATE %s %.*s\n",
243 SVCFH_fmt(dirfhp), argp->len, argp->name);
244
245 /* First verify the parent file handle */
Miklos Szeredi8837abc2008-06-16 13:20:29 +0200246 nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, NFSD_MAY_EXEC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 if (nfserr)
248 goto done; /* must fh_put dirfhp even on error */
249
Miklos Szeredi8837abc2008-06-16 13:20:29 +0200250 /* Check for NFSD_MAY_WRITE in nfsd_create if necessary */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 nfserr = nfserr_exist;
253 if (isdotent(argp->name, argp->len))
254 goto done;
Jan Kara4a55c102012-06-12 16:20:33 +0200255 hosterr = fh_want_write(dirfhp);
256 if (hosterr) {
257 nfserr = nfserrno(hosterr);
258 goto done;
259 }
260
NeilBrown7ed94292006-10-04 02:15:43 -0700261 fh_lock_nested(dirfhp, I_MUTEX_PARENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len);
263 if (IS_ERR(dchild)) {
264 nfserr = nfserrno(PTR_ERR(dchild));
265 goto out_unlock;
266 }
267 fh_init(newfhp, NFS_FHSIZE);
268 nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp);
David Howells2b0143b2015-03-17 22:25:59 +0000269 if (!nfserr && d_really_is_negative(dchild))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 nfserr = nfserr_noent;
271 dput(dchild);
272 if (nfserr) {
273 if (nfserr != nfserr_noent)
274 goto out_unlock;
275 /*
276 * If the new file handle wasn't verified, we can't tell
277 * whether the file exists or not. Time to bail ...
278 */
279 nfserr = nfserr_acces;
280 if (!newfhp->fh_dentry) {
281 printk(KERN_WARNING
282 "nfsd_proc_create: file handle not verified\n");
283 goto out_unlock;
284 }
285 }
286
David Howells2b0143b2015-03-17 22:25:59 +0000287 inode = d_inode(newfhp->fh_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289 /* Unfudge the mode bits */
290 if (attr->ia_valid & ATTR_MODE) {
291 type = attr->ia_mode & S_IFMT;
292 mode = attr->ia_mode & ~S_IFMT;
293 if (!type) {
294 /* no type, so if target exists, assume same as that,
295 * else assume a file */
296 if (inode) {
297 type = inode->i_mode & S_IFMT;
298 switch(type) {
299 case S_IFCHR:
300 case S_IFBLK:
301 /* reserve rdev for later checking */
302 rdev = inode->i_rdev;
303 attr->ia_valid |= ATTR_SIZE;
304
305 /* FALLTHROUGH */
306 case S_IFIFO:
307 /* this is probably a permission check..
308 * at least IRIX implements perm checking on
309 * echo thing > device-special-file-or-pipe
310 * by doing a CREATE with type==0
311 */
J. Bruce Fields0ec757d2007-07-17 04:04:48 -0700312 nfserr = nfsd_permission(rqstp,
313 newfhp->fh_export,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 newfhp->fh_dentry,
Miklos Szeredi8837abc2008-06-16 13:20:29 +0200315 NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 if (nfserr && nfserr != nfserr_rofs)
317 goto out_unlock;
318 }
319 } else
320 type = S_IFREG;
321 }
322 } else if (inode) {
323 type = inode->i_mode & S_IFMT;
324 mode = inode->i_mode & ~S_IFMT;
325 } else {
326 type = S_IFREG;
327 mode = 0; /* ??? */
328 }
329
330 attr->ia_valid |= ATTR_MODE;
331 attr->ia_mode = mode;
332
333 /* Special treatment for non-regular files according to the
334 * gospel of sun micro
335 */
336 if (type != S_IFREG) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 if (type != S_IFBLK && type != S_IFCHR) {
338 rdev = 0;
339 } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) {
340 /* If you think you've seen the worst, grok this. */
341 type = S_IFIFO;
342 } else {
343 /* Okay, char or block special */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 if (!rdev)
345 rdev = wanted;
346 }
347
348 /* we've used the SIZE information, so discard it */
349 attr->ia_valid &= ~ATTR_SIZE;
350
351 /* Make sure the type and device matches */
352 nfserr = nfserr_exist;
353 if (inode && type != (inode->i_mode & S_IFMT))
354 goto out_unlock;
355 }
356
357 nfserr = 0;
358 if (!inode) {
359 /* File doesn't exist. Create it and set attrs */
J. Bruce Fieldsb44061d2016-07-20 16:16:06 -0400360 nfserr = nfsd_create_locked(rqstp, dirfhp, argp->name,
361 argp->len, attr, type, rdev, newfhp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 } else if (type == S_IFREG) {
363 dprintk("nfsd: existing %s, valid=%x, size=%ld\n",
364 argp->name, attr->ia_valid, (long) attr->ia_size);
365 /* File already exists. We ignore all attributes except
366 * size, so that creat() behaves exactly like
367 * open(..., O_CREAT|O_TRUNC|O_WRONLY).
368 */
369 attr->ia_valid &= ATTR_SIZE;
370 if (attr->ia_valid)
371 nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0);
372 }
373
374out_unlock:
375 /* We don't really need to unlock, as fh_put does it. */
376 fh_unlock(dirfhp);
Jan Kara4a55c102012-06-12 16:20:33 +0200377 fh_drop_write(dirfhp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378done:
379 fh_put(dirfhp);
David Shaw846f2fc2006-01-18 17:43:51 -0800380 return nfsd_return_dirop(nfserr, resp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
382
Al Viro7111c662006-10-19 23:28:45 -0700383static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
385 void *resp)
386{
Al Viroc4d987b2006-10-19 23:29:00 -0700387 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
389 dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh),
390 argp->len, argp->name);
391
392 /* Unlink. -SIFDIR means file must not be a directory */
393 nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len);
394 fh_put(&argp->fh);
395 return nfserr;
396}
397
Al Viro7111c662006-10-19 23:28:45 -0700398static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp,
400 void *resp)
401{
Al Viroc4d987b2006-10-19 23:29:00 -0700402 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
404 dprintk("nfsd: RENAME %s %.*s -> \n",
405 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname);
406 dprintk("nfsd: -> %s %.*s\n",
407 SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname);
408
409 nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen,
410 &argp->tfh, argp->tname, argp->tlen);
411 fh_put(&argp->ffh);
412 fh_put(&argp->tfh);
413 return nfserr;
414}
415
Al Viro7111c662006-10-19 23:28:45 -0700416static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp,
418 void *resp)
419{
Al Viroc4d987b2006-10-19 23:29:00 -0700420 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
422 dprintk("nfsd: LINK %s ->\n",
423 SVCFH_fmt(&argp->ffh));
424 dprintk("nfsd: %s %.*s\n",
425 SVCFH_fmt(&argp->tfh),
426 argp->tlen,
427 argp->tname);
428
429 nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen,
430 &argp->ffh);
431 fh_put(&argp->ffh);
432 fh_put(&argp->tfh);
433 return nfserr;
434}
435
Al Viro7111c662006-10-19 23:28:45 -0700436static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp,
438 void *resp)
439{
440 struct svc_fh newfh;
Al Viroc4d987b2006-10-19 23:29:00 -0700441 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443 dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n",
444 SVCFH_fmt(&argp->ffh), argp->flen, argp->fname,
445 argp->tlen, argp->tname);
446
447 fh_init(&newfh, NFS_FHSIZE);
448 /*
J. Bruce Fields0aeae332014-06-20 11:49:49 -0400449 * Crazy hack: the request fits in a page, and already-decoded
450 * attributes follow argp->tname, so it's safe to just write a
451 * null to ensure it's null-terminated:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 */
J. Bruce Fields0aeae332014-06-20 11:49:49 -0400453 argp->tname[argp->tlen] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen,
Kinglong Mee1e444f52014-07-01 17:48:02 +0800455 argp->tname, &newfh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
457 fh_put(&argp->ffh);
458 fh_put(&newfh);
459 return nfserr;
460}
461
462/*
463 * Make directory. This operation is not idempotent.
464 * N.B. After this call resp->fh needs an fh_put
465 */
Al Viro7111c662006-10-19 23:28:45 -0700466static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp,
468 struct nfsd_diropres *resp)
469{
Al Viroc4d987b2006-10-19 23:29:00 -0700470 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
472 dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
473
474 if (resp->fh.fh_dentry) {
475 printk(KERN_WARNING
476 "nfsd_proc_mkdir: response already verified??\n");
477 }
478
479 argp->attrs.ia_valid &= ~ATTR_SIZE;
480 fh_init(&resp->fh, NFS_FHSIZE);
481 nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len,
482 &argp->attrs, S_IFDIR, 0, &resp->fh);
483 fh_put(&argp->fh);
David Shaw846f2fc2006-01-18 17:43:51 -0800484 return nfsd_return_dirop(nfserr, resp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485}
486
487/*
488 * Remove a directory
489 */
Al Viro7111c662006-10-19 23:28:45 -0700490static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp,
492 void *resp)
493{
Al Viroc4d987b2006-10-19 23:29:00 -0700494 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
496 dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name);
497
498 nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len);
499 fh_put(&argp->fh);
500 return nfserr;
501}
502
503/*
504 * Read a portion of a directory.
505 */
Al Viro7111c662006-10-19 23:28:45 -0700506static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp,
508 struct nfsd_readdirres *resp)
509{
Al Viroc4d987b2006-10-19 23:29:00 -0700510 int count;
511 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 loff_t offset;
513
514 dprintk("nfsd: READDIR %s %d bytes at %d\n",
515 SVCFH_fmt(&argp->fh),
516 argp->count, argp->cookie);
517
518 /* Shrink to the client read size */
519 count = (argp->count >> 2) - 2;
520
521 /* Make sure we've room for the NULL ptr & eof flag */
522 count -= 2;
523 if (count < 0)
524 count = 0;
525
526 resp->buffer = argp->buffer;
527 resp->offset = NULL;
528 resp->buflen = count;
529 resp->common.err = nfs_ok;
530 /* Read directory and encode entries on the fly */
531 offset = argp->cookie;
532 nfserr = nfsd_readdir(rqstp, &argp->fh, &offset,
533 &resp->common, nfssvc_encode_entry);
534
535 resp->count = resp->buffer - argp->buffer;
536 if (resp->offset)
537 *resp->offset = htonl(offset);
538
539 fh_put(&argp->fh);
540 return nfserr;
541}
542
543/*
544 * Get file system info
545 */
Al Viro7111c662006-10-19 23:28:45 -0700546static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle *argp,
548 struct nfsd_statfsres *resp)
549{
Al Viroc4d987b2006-10-19 23:29:00 -0700550 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
552 dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh));
553
J. Bruce Fields04716e62008-08-07 13:00:20 -0400554 nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats,
555 NFSD_MAY_BYPASS_GSS_ON_ROOT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 fh_put(&argp->fh);
557 return nfserr;
558}
559
560/*
561 * NFSv2 Server procedures.
562 * Only the results of non-idempotent operations are cached.
563 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564struct nfsd_void { int dummy; };
565
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566#define ST 1 /* status */
567#define FH 8 /* filehandle */
568#define AT 18 /* attributes */
569
570static struct svc_procedure nfsd_procedures2[18] = {
Yu Zhiguob9081d92009-06-09 17:33:34 +0800571 [NFSPROC_NULL] = {
572 .pc_func = (svc_procfunc) nfsd_proc_null,
573 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
574 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
575 .pc_argsize = sizeof(struct nfsd_void),
576 .pc_ressize = sizeof(struct nfsd_void),
577 .pc_cachetype = RC_NOCACHE,
578 .pc_xdrressize = ST,
579 },
580 [NFSPROC_GETATTR] = {
581 .pc_func = (svc_procfunc) nfsd_proc_getattr,
582 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
583 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
584 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
585 .pc_argsize = sizeof(struct nfsd_fhandle),
586 .pc_ressize = sizeof(struct nfsd_attrstat),
587 .pc_cachetype = RC_NOCACHE,
588 .pc_xdrressize = ST+AT,
589 },
590 [NFSPROC_SETATTR] = {
591 .pc_func = (svc_procfunc) nfsd_proc_setattr,
592 .pc_decode = (kxdrproc_t) nfssvc_decode_sattrargs,
593 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
594 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
595 .pc_argsize = sizeof(struct nfsd_sattrargs),
596 .pc_ressize = sizeof(struct nfsd_attrstat),
597 .pc_cachetype = RC_REPLBUFF,
598 .pc_xdrressize = ST+AT,
599 },
600 [NFSPROC_ROOT] = {
601 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
602 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
603 .pc_argsize = sizeof(struct nfsd_void),
604 .pc_ressize = sizeof(struct nfsd_void),
605 .pc_cachetype = RC_NOCACHE,
606 .pc_xdrressize = ST,
607 },
608 [NFSPROC_LOOKUP] = {
609 .pc_func = (svc_procfunc) nfsd_proc_lookup,
610 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
611 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
612 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
613 .pc_argsize = sizeof(struct nfsd_diropargs),
614 .pc_ressize = sizeof(struct nfsd_diropres),
615 .pc_cachetype = RC_NOCACHE,
616 .pc_xdrressize = ST+FH+AT,
617 },
618 [NFSPROC_READLINK] = {
619 .pc_func = (svc_procfunc) nfsd_proc_readlink,
620 .pc_decode = (kxdrproc_t) nfssvc_decode_readlinkargs,
621 .pc_encode = (kxdrproc_t) nfssvc_encode_readlinkres,
622 .pc_argsize = sizeof(struct nfsd_readlinkargs),
623 .pc_ressize = sizeof(struct nfsd_readlinkres),
624 .pc_cachetype = RC_NOCACHE,
625 .pc_xdrressize = ST+1+NFS_MAXPATHLEN/4,
626 },
627 [NFSPROC_READ] = {
628 .pc_func = (svc_procfunc) nfsd_proc_read,
629 .pc_decode = (kxdrproc_t) nfssvc_decode_readargs,
630 .pc_encode = (kxdrproc_t) nfssvc_encode_readres,
631 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
632 .pc_argsize = sizeof(struct nfsd_readargs),
633 .pc_ressize = sizeof(struct nfsd_readres),
634 .pc_cachetype = RC_NOCACHE,
635 .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4,
636 },
637 [NFSPROC_WRITECACHE] = {
638 .pc_decode = (kxdrproc_t) nfssvc_decode_void,
639 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
640 .pc_argsize = sizeof(struct nfsd_void),
641 .pc_ressize = sizeof(struct nfsd_void),
642 .pc_cachetype = RC_NOCACHE,
643 .pc_xdrressize = ST,
644 },
645 [NFSPROC_WRITE] = {
646 .pc_func = (svc_procfunc) nfsd_proc_write,
647 .pc_decode = (kxdrproc_t) nfssvc_decode_writeargs,
648 .pc_encode = (kxdrproc_t) nfssvc_encode_attrstat,
649 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
650 .pc_argsize = sizeof(struct nfsd_writeargs),
651 .pc_ressize = sizeof(struct nfsd_attrstat),
652 .pc_cachetype = RC_REPLBUFF,
653 .pc_xdrressize = ST+AT,
654 },
655 [NFSPROC_CREATE] = {
656 .pc_func = (svc_procfunc) nfsd_proc_create,
657 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
658 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
659 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
660 .pc_argsize = sizeof(struct nfsd_createargs),
661 .pc_ressize = sizeof(struct nfsd_diropres),
662 .pc_cachetype = RC_REPLBUFF,
663 .pc_xdrressize = ST+FH+AT,
664 },
665 [NFSPROC_REMOVE] = {
666 .pc_func = (svc_procfunc) nfsd_proc_remove,
667 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
668 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
669 .pc_argsize = sizeof(struct nfsd_diropargs),
670 .pc_ressize = sizeof(struct nfsd_void),
671 .pc_cachetype = RC_REPLSTAT,
672 .pc_xdrressize = ST,
673 },
674 [NFSPROC_RENAME] = {
675 .pc_func = (svc_procfunc) nfsd_proc_rename,
676 .pc_decode = (kxdrproc_t) nfssvc_decode_renameargs,
677 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
678 .pc_argsize = sizeof(struct nfsd_renameargs),
679 .pc_ressize = sizeof(struct nfsd_void),
680 .pc_cachetype = RC_REPLSTAT,
681 .pc_xdrressize = ST,
682 },
683 [NFSPROC_LINK] = {
684 .pc_func = (svc_procfunc) nfsd_proc_link,
685 .pc_decode = (kxdrproc_t) nfssvc_decode_linkargs,
686 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
687 .pc_argsize = sizeof(struct nfsd_linkargs),
688 .pc_ressize = sizeof(struct nfsd_void),
689 .pc_cachetype = RC_REPLSTAT,
690 .pc_xdrressize = ST,
691 },
692 [NFSPROC_SYMLINK] = {
693 .pc_func = (svc_procfunc) nfsd_proc_symlink,
694 .pc_decode = (kxdrproc_t) nfssvc_decode_symlinkargs,
695 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
696 .pc_argsize = sizeof(struct nfsd_symlinkargs),
697 .pc_ressize = sizeof(struct nfsd_void),
698 .pc_cachetype = RC_REPLSTAT,
699 .pc_xdrressize = ST,
700 },
701 [NFSPROC_MKDIR] = {
702 .pc_func = (svc_procfunc) nfsd_proc_mkdir,
703 .pc_decode = (kxdrproc_t) nfssvc_decode_createargs,
704 .pc_encode = (kxdrproc_t) nfssvc_encode_diropres,
705 .pc_release = (kxdrproc_t) nfssvc_release_fhandle,
706 .pc_argsize = sizeof(struct nfsd_createargs),
707 .pc_ressize = sizeof(struct nfsd_diropres),
708 .pc_cachetype = RC_REPLBUFF,
709 .pc_xdrressize = ST+FH+AT,
710 },
711 [NFSPROC_RMDIR] = {
712 .pc_func = (svc_procfunc) nfsd_proc_rmdir,
713 .pc_decode = (kxdrproc_t) nfssvc_decode_diropargs,
714 .pc_encode = (kxdrproc_t) nfssvc_encode_void,
715 .pc_argsize = sizeof(struct nfsd_diropargs),
716 .pc_ressize = sizeof(struct nfsd_void),
717 .pc_cachetype = RC_REPLSTAT,
718 .pc_xdrressize = ST,
719 },
720 [NFSPROC_READDIR] = {
721 .pc_func = (svc_procfunc) nfsd_proc_readdir,
722 .pc_decode = (kxdrproc_t) nfssvc_decode_readdirargs,
723 .pc_encode = (kxdrproc_t) nfssvc_encode_readdirres,
724 .pc_argsize = sizeof(struct nfsd_readdirargs),
725 .pc_ressize = sizeof(struct nfsd_readdirres),
726 .pc_cachetype = RC_NOCACHE,
727 },
728 [NFSPROC_STATFS] = {
729 .pc_func = (svc_procfunc) nfsd_proc_statfs,
730 .pc_decode = (kxdrproc_t) nfssvc_decode_fhandle,
731 .pc_encode = (kxdrproc_t) nfssvc_encode_statfsres,
732 .pc_argsize = sizeof(struct nfsd_fhandle),
733 .pc_ressize = sizeof(struct nfsd_statfsres),
734 .pc_cachetype = RC_NOCACHE,
735 .pc_xdrressize = ST+5,
736 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737};
738
739
740struct svc_version nfsd_version2 = {
741 .vs_vers = 2,
742 .vs_nproc = 18,
743 .vs_proc = nfsd_procedures2,
744 .vs_dispatch = nfsd_dispatch,
745 .vs_xdrsize = NFS2_SVC_XDRSIZE,
746};
747
748/*
749 * Map errnos to NFS errnos.
750 */
Al Viro63f103112006-10-19 23:28:54 -0700751__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752nfserrno (int errno)
753{
754 static struct {
Al Viro63f103112006-10-19 23:28:54 -0700755 __be32 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 int syserr;
757 } nfs_errtbl[] = {
758 { nfs_ok, 0 },
759 { nfserr_perm, -EPERM },
760 { nfserr_noent, -ENOENT },
761 { nfserr_io, -EIO },
762 { nfserr_nxio, -ENXIO },
Jeff Layton62814d62014-07-03 15:15:54 -0400763 { nfserr_fbig, -E2BIG },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 { nfserr_acces, -EACCES },
765 { nfserr_exist, -EEXIST },
766 { nfserr_xdev, -EXDEV },
767 { nfserr_mlink, -EMLINK },
768 { nfserr_nodev, -ENODEV },
769 { nfserr_notdir, -ENOTDIR },
770 { nfserr_isdir, -EISDIR },
771 { nfserr_inval, -EINVAL },
772 { nfserr_fbig, -EFBIG },
773 { nfserr_nospc, -ENOSPC },
774 { nfserr_rofs, -EROFS },
775 { nfserr_mlink, -EMLINK },
776 { nfserr_nametoolong, -ENAMETOOLONG },
777 { nfserr_notempty, -ENOTEMPTY },
778#ifdef EDQUOT
779 { nfserr_dquot, -EDQUOT },
780#endif
781 { nfserr_stale, -ESTALE },
782 { nfserr_jukebox, -ETIMEDOUT },
NeilBrown599eb302008-06-19 10:11:09 +1000783 { nfserr_jukebox, -ERESTARTSYS },
J. Bruce Fields062304a2011-01-02 22:05:33 -0500784 { nfserr_jukebox, -EAGAIN },
785 { nfserr_jukebox, -EWOULDBLOCK },
J. Bruce Fields3beb6cd2011-01-01 15:43:50 -0500786 { nfserr_jukebox, -ENOMEM },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 { nfserr_io, -ETXTBSY },
Andreas Gruenbachera838cc42005-06-22 17:16:24 +0000788 { nfserr_notsupp, -EOPNOTSUPP },
Dean Hildebrandb7aeda42008-12-15 19:40:15 +0200789 { nfserr_toosmall, -ETOOSMALL },
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -0400790 { nfserr_serverfault, -ESERVERFAULT },
Jeff Laytonb3fbfe02014-07-29 21:37:44 -0400791 { nfserr_serverfault, -ENFILE },
J. Bruce Fields42e61612016-10-04 13:57:43 -0400792 { nfserr_io, -EUCLEAN },
Kinglong Mee3967cf72017-03-10 09:52:20 +0800793 { nfserr_perm, -ENOKEY },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 };
795 int i;
796
Al Viro63f103112006-10-19 23:28:54 -0700797 for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 if (nfs_errtbl[i].syserr == errno)
799 return nfs_errtbl[i].nfserr;
800 }
J. Bruce Fieldsff30f082016-10-04 12:53:49 -0400801 WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 return nfserr_io;
803}
804