x86: Under BIOS control, restore AP's APIC_LVTTHMR to the BSP value
[linux-2.6/mini2440.git] / fs / nfsd / vfs.c
blob23341c1063bcd05fb2841dc6b49d0a91eef36293
1 #define MSNFS /* HACK HACK */
2 /*
3 * linux/fs/nfsd/vfs.c
5 * File operations used by nfsd. Some of these have been ripped from
6 * other parts of the kernel because they weren't exported, others
7 * are partial duplicates with added or changed functionality.
9 * Note that several functions dget() the dentry upon which they want
10 * to act, most notably those that create directory entries. Response
11 * dentry's are dput()'d if necessary in the release callback.
12 * So if you notice code paths that apparently fail to dput() the
13 * dentry, don't worry--they have been taken care of.
15 * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de>
16 * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp>
19 #include <linux/string.h>
20 #include <linux/time.h>
21 #include <linux/errno.h>
22 #include <linux/fs.h>
23 #include <linux/file.h>
24 #include <linux/mount.h>
25 #include <linux/major.h>
26 #include <linux/splice.h>
27 #include <linux/proc_fs.h>
28 #include <linux/stat.h>
29 #include <linux/fcntl.h>
30 #include <linux/net.h>
31 #include <linux/unistd.h>
32 #include <linux/slab.h>
33 #include <linux/pagemap.h>
34 #include <linux/in.h>
35 #include <linux/module.h>
36 #include <linux/namei.h>
37 #include <linux/vfs.h>
38 #include <linux/delay.h>
39 #include <linux/sunrpc/svc.h>
40 #include <linux/nfsd/nfsd.h>
41 #ifdef CONFIG_NFSD_V3
42 #include <linux/nfs3.h>
43 #include <linux/nfsd/xdr3.h>
44 #endif /* CONFIG_NFSD_V3 */
45 #include <linux/nfsd/nfsfh.h>
46 #include <linux/quotaops.h>
47 #include <linux/fsnotify.h>
48 #include <linux/posix_acl.h>
49 #include <linux/posix_acl_xattr.h>
50 #include <linux/xattr.h>
51 #ifdef CONFIG_NFSD_V4
52 #include <linux/nfs4.h>
53 #include <linux/nfs4_acl.h>
54 #include <linux/nfsd_idmap.h>
55 #include <linux/security.h>
56 #endif /* CONFIG_NFSD_V4 */
57 #include <linux/jhash.h>
58 #include <linux/ima.h>
60 #include <asm/uaccess.h>
62 #define NFSDDBG_FACILITY NFSDDBG_FILEOP
66 * This is a cache of readahead params that help us choose the proper
67 * readahead strategy. Initially, we set all readahead parameters to 0
68 * and let the VFS handle things.
69 * If you increase the number of cached files very much, you'll need to
70 * add a hash table here.
72 struct raparms {
73 struct raparms *p_next;
74 unsigned int p_count;
75 ino_t p_ino;
76 dev_t p_dev;
77 int p_set;
78 struct file_ra_state p_ra;
79 unsigned int p_hindex;
82 struct raparm_hbucket {
83 struct raparms *pb_head;
84 spinlock_t pb_lock;
85 } ____cacheline_aligned_in_smp;
87 #define RAPARM_HASH_BITS 4
88 #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS)
89 #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1)
90 static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE];
92 /*
93 * Called from nfsd_lookup and encode_dirent. Check if we have crossed
94 * a mount point.
95 * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged,
96 * or nfs_ok having possibly changed *dpp and *expp
98 int
99 nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
100 struct svc_export **expp)
102 struct svc_export *exp = *expp, *exp2 = NULL;
103 struct dentry *dentry = *dpp;
104 struct path path = {.mnt = mntget(exp->ex_path.mnt),
105 .dentry = dget(dentry)};
106 int err = 0;
108 while (d_mountpoint(path.dentry) && follow_down(&path))
111 exp2 = rqst_exp_get_by_name(rqstp, &path);
112 if (IS_ERR(exp2)) {
113 if (PTR_ERR(exp2) != -ENOENT)
114 err = PTR_ERR(exp2);
115 path_put(&path);
116 goto out;
118 if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) {
119 /* successfully crossed mount point */
121 * This is subtle: path.dentry is *not* on path.mnt
122 * at this point. The only reason we are safe is that
123 * original mnt is pinned down by exp, so we should
124 * put path *before* putting exp
126 *dpp = path.dentry;
127 path.dentry = dentry;
128 *expp = exp2;
129 exp2 = exp;
131 path_put(&path);
132 exp_put(exp2);
133 out:
134 return err;
137 __be32
138 nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
139 const char *name, unsigned int len,
140 struct svc_export **exp_ret, struct dentry **dentry_ret)
142 struct svc_export *exp;
143 struct dentry *dparent;
144 struct dentry *dentry;
145 __be32 err;
146 int host_err;
148 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
150 /* Obtain dentry and export. */
151 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
152 if (err)
153 return err;
155 dparent = fhp->fh_dentry;
156 exp = fhp->fh_export;
157 exp_get(exp);
159 /* Lookup the name, but don't follow links */
160 if (isdotent(name, len)) {
161 if (len==1)
162 dentry = dget(dparent);
163 else if (dparent != exp->ex_path.dentry)
164 dentry = dget_parent(dparent);
165 else if (!EX_NOHIDE(exp))
166 dentry = dget(dparent); /* .. == . just like at / */
167 else {
168 /* checking mountpoint crossing is very different when stepping up */
169 struct svc_export *exp2 = NULL;
170 struct dentry *dp;
171 struct path path = {.mnt = mntget(exp->ex_path.mnt),
172 .dentry = dget(dparent)};
174 while (path.dentry == path.mnt->mnt_root &&
175 follow_up(&path))
177 dp = dget_parent(path.dentry);
178 dput(path.dentry);
179 path.dentry = dp;
181 exp2 = rqst_exp_parent(rqstp, &path);
182 if (PTR_ERR(exp2) == -ENOENT) {
183 dentry = dget(dparent);
184 } else if (IS_ERR(exp2)) {
185 host_err = PTR_ERR(exp2);
186 path_put(&path);
187 goto out_nfserr;
188 } else {
189 dentry = dget(path.dentry);
190 exp_put(exp);
191 exp = exp2;
193 path_put(&path);
195 } else {
196 fh_lock(fhp);
197 dentry = lookup_one_len(name, dparent, len);
198 host_err = PTR_ERR(dentry);
199 if (IS_ERR(dentry))
200 goto out_nfserr;
202 * check if we have crossed a mount point ...
204 if (d_mountpoint(dentry)) {
205 if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
206 dput(dentry);
207 goto out_nfserr;
211 *dentry_ret = dentry;
212 *exp_ret = exp;
213 return 0;
215 out_nfserr:
216 exp_put(exp);
217 return nfserrno(host_err);
221 * Look up one component of a pathname.
222 * N.B. After this call _both_ fhp and resfh need an fh_put
224 * If the lookup would cross a mountpoint, and the mounted filesystem
225 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
226 * accepted as it stands and the mounted directory is
227 * returned. Otherwise the covered directory is returned.
228 * NOTE: this mountpoint crossing is not supported properly by all
229 * clients and is explicitly disallowed for NFSv3
230 * NeilBrown <neilb@cse.unsw.edu.au>
232 __be32
233 nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
234 unsigned int len, struct svc_fh *resfh)
236 struct svc_export *exp;
237 struct dentry *dentry;
238 __be32 err;
240 err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry);
241 if (err)
242 return err;
243 err = check_nfsd_access(exp, rqstp);
244 if (err)
245 goto out;
247 * Note: we compose the file handle now, but as the
248 * dentry may be negative, it may need to be updated.
250 err = fh_compose(resfh, exp, dentry, fhp);
251 if (!err && !dentry->d_inode)
252 err = nfserr_noent;
253 out:
254 dput(dentry);
255 exp_put(exp);
256 return err;
261 * Set various file attributes.
262 * N.B. After this call fhp needs an fh_put
264 __be32
265 nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
266 int check_guard, time_t guardtime)
268 struct dentry *dentry;
269 struct inode *inode;
270 int accmode = NFSD_MAY_SATTR;
271 int ftype = 0;
272 __be32 err;
273 int host_err;
274 int size_change = 0;
276 if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
277 accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE;
278 if (iap->ia_valid & ATTR_SIZE)
279 ftype = S_IFREG;
281 /* Get inode */
282 err = fh_verify(rqstp, fhp, ftype, accmode);
283 if (err)
284 goto out;
286 dentry = fhp->fh_dentry;
287 inode = dentry->d_inode;
289 /* Ignore any mode updates on symlinks */
290 if (S_ISLNK(inode->i_mode))
291 iap->ia_valid &= ~ATTR_MODE;
293 if (!iap->ia_valid)
294 goto out;
297 * NFSv2 does not differentiate between "set-[ac]time-to-now"
298 * which only requires access, and "set-[ac]time-to-X" which
299 * requires ownership.
300 * So if it looks like it might be "set both to the same time which
301 * is close to now", and if inode_change_ok fails, then we
302 * convert to "set to now" instead of "set to explicit time"
304 * We only call inode_change_ok as the last test as technically
305 * it is not an interface that we should be using. It is only
306 * valid if the filesystem does not define it's own i_op->setattr.
308 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
309 #define MAX_TOUCH_TIME_ERROR (30*60)
310 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
311 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
313 * Looks probable.
315 * Now just make sure time is in the right ballpark.
316 * Solaris, at least, doesn't seem to care what the time
317 * request is. We require it be within 30 minutes of now.
319 time_t delta = iap->ia_atime.tv_sec - get_seconds();
320 if (delta < 0)
321 delta = -delta;
322 if (delta < MAX_TOUCH_TIME_ERROR &&
323 inode_change_ok(inode, iap) != 0) {
325 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
326 * This will cause notify_change to set these times
327 * to "now"
329 iap->ia_valid &= ~BOTH_TIME_SET;
334 * The size case is special.
335 * It changes the file as well as the attributes.
337 if (iap->ia_valid & ATTR_SIZE) {
338 if (iap->ia_size < inode->i_size) {
339 err = nfsd_permission(rqstp, fhp->fh_export, dentry,
340 NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE);
341 if (err)
342 goto out;
346 * If we are changing the size of the file, then
347 * we need to break all leases.
349 host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
350 if (host_err == -EWOULDBLOCK)
351 host_err = -ETIMEDOUT;
352 if (host_err) /* ENOMEM or EWOULDBLOCK */
353 goto out_nfserr;
355 host_err = get_write_access(inode);
356 if (host_err)
357 goto out_nfserr;
359 size_change = 1;
360 host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
361 if (host_err) {
362 put_write_access(inode);
363 goto out_nfserr;
365 vfs_dq_init(inode);
368 /* sanitize the mode change */
369 if (iap->ia_valid & ATTR_MODE) {
370 iap->ia_mode &= S_IALLUGO;
371 iap->ia_mode |= (inode->i_mode & ~S_IALLUGO);
374 /* Revoke setuid/setgid on chown */
375 if (!S_ISDIR(inode->i_mode) &&
376 (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) ||
377 ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) {
378 iap->ia_valid |= ATTR_KILL_PRIV;
379 if (iap->ia_valid & ATTR_MODE) {
380 /* we're setting mode too, just clear the s*id bits */
381 iap->ia_mode &= ~S_ISUID;
382 if (iap->ia_mode & S_IXGRP)
383 iap->ia_mode &= ~S_ISGID;
384 } else {
385 /* set ATTR_KILL_* bits and let VFS handle it */
386 iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID);
390 /* Change the attributes. */
392 iap->ia_valid |= ATTR_CTIME;
394 err = nfserr_notsync;
395 if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
396 fh_lock(fhp);
397 host_err = notify_change(dentry, iap);
398 err = nfserrno(host_err);
399 fh_unlock(fhp);
401 if (size_change)
402 put_write_access(inode);
403 if (!err)
404 if (EX_ISSYNC(fhp->fh_export))
405 write_inode_now(inode, 1);
406 out:
407 return err;
409 out_nfserr:
410 err = nfserrno(host_err);
411 goto out;
414 #if defined(CONFIG_NFSD_V2_ACL) || \
415 defined(CONFIG_NFSD_V3_ACL) || \
416 defined(CONFIG_NFSD_V4)
417 static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
419 ssize_t buflen;
420 ssize_t ret;
422 buflen = vfs_getxattr(dentry, key, NULL, 0);
423 if (buflen <= 0)
424 return buflen;
426 *buf = kmalloc(buflen, GFP_KERNEL);
427 if (!*buf)
428 return -ENOMEM;
430 ret = vfs_getxattr(dentry, key, *buf, buflen);
431 if (ret < 0)
432 kfree(*buf);
433 return ret;
435 #endif
437 #if defined(CONFIG_NFSD_V4)
438 static int
439 set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
441 int len;
442 size_t buflen;
443 char *buf = NULL;
444 int error = 0;
446 buflen = posix_acl_xattr_size(pacl->a_count);
447 buf = kmalloc(buflen, GFP_KERNEL);
448 error = -ENOMEM;
449 if (buf == NULL)
450 goto out;
452 len = posix_acl_to_xattr(pacl, buf, buflen);
453 if (len < 0) {
454 error = len;
455 goto out;
458 error = vfs_setxattr(dentry, key, buf, len, 0);
459 out:
460 kfree(buf);
461 return error;
464 __be32
465 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
466 struct nfs4_acl *acl)
468 __be32 error;
469 int host_error;
470 struct dentry *dentry;
471 struct inode *inode;
472 struct posix_acl *pacl = NULL, *dpacl = NULL;
473 unsigned int flags = 0;
475 /* Get inode */
476 error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR);
477 if (error)
478 return error;
480 dentry = fhp->fh_dentry;
481 inode = dentry->d_inode;
482 if (S_ISDIR(inode->i_mode))
483 flags = NFS4_ACL_DIR;
485 host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
486 if (host_error == -EINVAL) {
487 return nfserr_attrnotsupp;
488 } else if (host_error < 0)
489 goto out_nfserr;
491 host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
492 if (host_error < 0)
493 goto out_release;
495 if (S_ISDIR(inode->i_mode))
496 host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
498 out_release:
499 posix_acl_release(pacl);
500 posix_acl_release(dpacl);
501 out_nfserr:
502 if (host_error == -EOPNOTSUPP)
503 return nfserr_attrnotsupp;
504 else
505 return nfserrno(host_error);
508 static struct posix_acl *
509 _get_posix_acl(struct dentry *dentry, char *key)
511 void *buf = NULL;
512 struct posix_acl *pacl = NULL;
513 int buflen;
515 buflen = nfsd_getxattr(dentry, key, &buf);
516 if (!buflen)
517 buflen = -ENODATA;
518 if (buflen <= 0)
519 return ERR_PTR(buflen);
521 pacl = posix_acl_from_xattr(buf, buflen);
522 kfree(buf);
523 return pacl;
527 nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
529 struct inode *inode = dentry->d_inode;
530 int error = 0;
531 struct posix_acl *pacl = NULL, *dpacl = NULL;
532 unsigned int flags = 0;
534 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
535 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
536 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
537 if (IS_ERR(pacl)) {
538 error = PTR_ERR(pacl);
539 pacl = NULL;
540 goto out;
543 if (S_ISDIR(inode->i_mode)) {
544 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
545 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
546 dpacl = NULL;
547 else if (IS_ERR(dpacl)) {
548 error = PTR_ERR(dpacl);
549 dpacl = NULL;
550 goto out;
552 flags = NFS4_ACL_DIR;
555 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
556 if (IS_ERR(*acl)) {
557 error = PTR_ERR(*acl);
558 *acl = NULL;
560 out:
561 posix_acl_release(pacl);
562 posix_acl_release(dpacl);
563 return error;
566 #endif /* defined(CONFIG_NFS_V4) */
568 #ifdef CONFIG_NFSD_V3
570 * Check server access rights to a file system object
572 struct accessmap {
573 u32 access;
574 int how;
576 static struct accessmap nfs3_regaccess[] = {
577 { NFS3_ACCESS_READ, NFSD_MAY_READ },
578 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
579 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
580 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE },
582 { 0, 0 }
585 static struct accessmap nfs3_diraccess[] = {
586 { NFS3_ACCESS_READ, NFSD_MAY_READ },
587 { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC },
588 { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC},
589 { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE },
590 { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE },
592 { 0, 0 }
595 static struct accessmap nfs3_anyaccess[] = {
596 /* Some clients - Solaris 2.6 at least, make an access call
597 * to the server to check for access for things like /dev/null
598 * (which really, the server doesn't care about). So
599 * We provide simple access checking for them, looking
600 * mainly at mode bits, and we make sure to ignore read-only
601 * filesystem checks
603 { NFS3_ACCESS_READ, NFSD_MAY_READ },
604 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
605 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
606 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
608 { 0, 0 }
611 __be32
612 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
614 struct accessmap *map;
615 struct svc_export *export;
616 struct dentry *dentry;
617 u32 query, result = 0, sresult = 0;
618 __be32 error;
620 error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
621 if (error)
622 goto out;
624 export = fhp->fh_export;
625 dentry = fhp->fh_dentry;
627 if (S_ISREG(dentry->d_inode->i_mode))
628 map = nfs3_regaccess;
629 else if (S_ISDIR(dentry->d_inode->i_mode))
630 map = nfs3_diraccess;
631 else
632 map = nfs3_anyaccess;
635 query = *access;
636 for (; map->access; map++) {
637 if (map->access & query) {
638 __be32 err2;
640 sresult |= map->access;
642 err2 = nfsd_permission(rqstp, export, dentry, map->how);
643 switch (err2) {
644 case nfs_ok:
645 result |= map->access;
646 break;
648 /* the following error codes just mean the access was not allowed,
649 * rather than an error occurred */
650 case nfserr_rofs:
651 case nfserr_acces:
652 case nfserr_perm:
653 /* simply don't "or" in the access bit. */
654 break;
655 default:
656 error = err2;
657 goto out;
661 *access = result;
662 if (supported)
663 *supported = sresult;
665 out:
666 return error;
668 #endif /* CONFIG_NFSD_V3 */
673 * Open an existing file or directory.
674 * The access argument indicates the type of open (read/write/lock)
675 * N.B. After this call fhp needs an fh_put
677 __be32
678 nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
679 int access, struct file **filp)
681 struct dentry *dentry;
682 struct inode *inode;
683 int flags = O_RDONLY|O_LARGEFILE;
684 __be32 err;
685 int host_err;
688 * If we get here, then the client has already done an "open",
689 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
690 * in case a chmod has now revoked permission.
692 err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE);
693 if (err)
694 goto out;
696 dentry = fhp->fh_dentry;
697 inode = dentry->d_inode;
699 /* Disallow write access to files with the append-only bit set
700 * or any access when mandatory locking enabled
702 err = nfserr_perm;
703 if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE))
704 goto out;
706 * We must ignore files (but only files) which might have mandatory
707 * locks on them because there is no way to know if the accesser has
708 * the lock.
710 if (S_ISREG((inode)->i_mode) && mandatory_lock(inode))
711 goto out;
713 if (!inode->i_fop)
714 goto out;
717 * Check to see if there are any leases on this file.
718 * This may block while leases are broken.
720 host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? FMODE_WRITE : 0));
721 if (host_err == -EWOULDBLOCK)
722 host_err = -ETIMEDOUT;
723 if (host_err) /* NOMEM or WOULDBLOCK */
724 goto out_nfserr;
726 if (access & NFSD_MAY_WRITE) {
727 if (access & NFSD_MAY_READ)
728 flags = O_RDWR|O_LARGEFILE;
729 else
730 flags = O_WRONLY|O_LARGEFILE;
732 vfs_dq_init(inode);
734 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt),
735 flags, current_cred());
736 if (IS_ERR(*filp))
737 host_err = PTR_ERR(*filp);
738 else
739 ima_counts_get(*filp);
740 out_nfserr:
741 err = nfserrno(host_err);
742 out:
743 return err;
747 * Close a file.
749 void
750 nfsd_close(struct file *filp)
752 fput(filp);
756 * Sync a file
757 * As this calls fsync (not fdatasync) there is no need for a write_inode
758 * after it.
760 static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
761 const struct file_operations *fop)
763 struct inode *inode = dp->d_inode;
764 int (*fsync) (struct file *, struct dentry *, int);
765 int err;
767 err = filemap_fdatawrite(inode->i_mapping);
768 if (err == 0 && fop && (fsync = fop->fsync))
769 err = fsync(filp, dp, 0);
770 if (err == 0)
771 err = filemap_fdatawait(inode->i_mapping);
773 return err;
776 static int
777 nfsd_sync(struct file *filp)
779 int err;
780 struct inode *inode = filp->f_path.dentry->d_inode;
781 dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name);
782 mutex_lock(&inode->i_mutex);
783 err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op);
784 mutex_unlock(&inode->i_mutex);
786 return err;
790 nfsd_sync_dir(struct dentry *dp)
792 return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
796 * Obtain the readahead parameters for the file
797 * specified by (dev, ino).
800 static inline struct raparms *
801 nfsd_get_raparms(dev_t dev, ino_t ino)
803 struct raparms *ra, **rap, **frap = NULL;
804 int depth = 0;
805 unsigned int hash;
806 struct raparm_hbucket *rab;
808 hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK;
809 rab = &raparm_hash[hash];
811 spin_lock(&rab->pb_lock);
812 for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) {
813 if (ra->p_ino == ino && ra->p_dev == dev)
814 goto found;
815 depth++;
816 if (ra->p_count == 0)
817 frap = rap;
819 depth = nfsdstats.ra_size*11/10;
820 if (!frap) {
821 spin_unlock(&rab->pb_lock);
822 return NULL;
824 rap = frap;
825 ra = *frap;
826 ra->p_dev = dev;
827 ra->p_ino = ino;
828 ra->p_set = 0;
829 ra->p_hindex = hash;
830 found:
831 if (rap != &rab->pb_head) {
832 *rap = ra->p_next;
833 ra->p_next = rab->pb_head;
834 rab->pb_head = ra;
836 ra->p_count++;
837 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
838 spin_unlock(&rab->pb_lock);
839 return ra;
843 * Grab and keep cached pages associated with a file in the svc_rqst
844 * so that they can be passed to the network sendmsg/sendpage routines
845 * directly. They will be released after the sending has completed.
847 static int
848 nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
849 struct splice_desc *sd)
851 struct svc_rqst *rqstp = sd->u.data;
852 struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
853 struct page *page = buf->page;
854 size_t size;
855 int ret;
857 ret = buf->ops->confirm(pipe, buf);
858 if (unlikely(ret))
859 return ret;
861 size = sd->len;
863 if (rqstp->rq_res.page_len == 0) {
864 get_page(page);
865 put_page(*pp);
866 *pp = page;
867 rqstp->rq_resused++;
868 rqstp->rq_res.page_base = buf->offset;
869 rqstp->rq_res.page_len = size;
870 } else if (page != pp[-1]) {
871 get_page(page);
872 if (*pp)
873 put_page(*pp);
874 *pp = page;
875 rqstp->rq_resused++;
876 rqstp->rq_res.page_len += size;
877 } else
878 rqstp->rq_res.page_len += size;
880 return size;
883 static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
884 struct splice_desc *sd)
886 return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
889 static inline int svc_msnfs(struct svc_fh *ffhp)
891 #ifdef MSNFS
892 return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS);
893 #else
894 return 0;
895 #endif
898 static __be32
899 nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
900 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
902 struct inode *inode;
903 struct raparms *ra;
904 mm_segment_t oldfs;
905 __be32 err;
906 int host_err;
908 err = nfserr_perm;
909 inode = file->f_path.dentry->d_inode;
911 if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count))
912 goto out;
914 /* Get readahead parameters */
915 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
917 if (ra && ra->p_set)
918 file->f_ra = ra->p_ra;
920 if (file->f_op->splice_read && rqstp->rq_splice_ok) {
921 struct splice_desc sd = {
922 .len = 0,
923 .total_len = *count,
924 .pos = offset,
925 .u.data = rqstp,
928 rqstp->rq_resused = 1;
929 host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
930 } else {
931 oldfs = get_fs();
932 set_fs(KERNEL_DS);
933 host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
934 set_fs(oldfs);
937 /* Write back readahead params */
938 if (ra) {
939 struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
940 spin_lock(&rab->pb_lock);
941 ra->p_ra = file->f_ra;
942 ra->p_set = 1;
943 ra->p_count--;
944 spin_unlock(&rab->pb_lock);
947 if (host_err >= 0) {
948 nfsdstats.io_read += host_err;
949 *count = host_err;
950 err = 0;
951 fsnotify_access(file->f_path.dentry);
952 } else
953 err = nfserrno(host_err);
954 out:
955 return err;
958 static void kill_suid(struct dentry *dentry)
960 struct iattr ia;
961 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
963 mutex_lock(&dentry->d_inode->i_mutex);
964 notify_change(dentry, &ia);
965 mutex_unlock(&dentry->d_inode->i_mutex);
969 * Gathered writes: If another process is currently writing to the file,
970 * there's a high chance this is another nfsd (triggered by a bulk write
971 * from a client's biod). Rather than syncing the file with each write
972 * request, we sleep for 10 msec.
974 * I don't know if this roughly approximates C. Juszak's idea of
975 * gathered writes, but it's a nice and simple solution (IMHO), and it
976 * seems to work:-)
978 * Note: we do this only in the NFSv2 case, since v3 and higher have a
979 * better tool (separate unstable writes and commits) for solving this
980 * problem.
982 static int wait_for_concurrent_writes(struct file *file)
984 struct inode *inode = file->f_path.dentry->d_inode;
985 static ino_t last_ino;
986 static dev_t last_dev;
987 int err = 0;
989 if (atomic_read(&inode->i_writecount) > 1
990 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
991 dprintk("nfsd: write defer %d\n", task_pid_nr(current));
992 msleep(10);
993 dprintk("nfsd: write resume %d\n", task_pid_nr(current));
996 if (inode->i_state & I_DIRTY) {
997 dprintk("nfsd: write sync %d\n", task_pid_nr(current));
998 err = nfsd_sync(file);
1000 last_ino = inode->i_ino;
1001 last_dev = inode->i_sb->s_dev;
1002 return err;
1005 static __be32
1006 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1007 loff_t offset, struct kvec *vec, int vlen,
1008 unsigned long *cnt, int *stablep)
1010 struct svc_export *exp;
1011 struct dentry *dentry;
1012 struct inode *inode;
1013 mm_segment_t oldfs;
1014 __be32 err = 0;
1015 int host_err;
1016 int stable = *stablep;
1017 int use_wgather;
1019 #ifdef MSNFS
1020 err = nfserr_perm;
1022 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1023 (!lock_may_write(file->f_path.dentry->d_inode, offset, *cnt)))
1024 goto out;
1025 #endif
1027 dentry = file->f_path.dentry;
1028 inode = dentry->d_inode;
1029 exp = fhp->fh_export;
1032 * Request sync writes if
1033 * - the sync export option has been set, or
1034 * - the client requested O_SYNC behavior (NFSv3 feature).
1035 * - The file system doesn't support fsync().
1036 * When NFSv2 gathered writes have been configured for this volume,
1037 * flushing the data to disk is handled separately below.
1039 use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp);
1041 if (!file->f_op->fsync) {/* COMMIT3 cannot work */
1042 stable = 2;
1043 *stablep = 2; /* FILE_SYNC */
1046 if (!EX_ISSYNC(exp))
1047 stable = 0;
1048 if (stable && !use_wgather) {
1049 spin_lock(&file->f_lock);
1050 file->f_flags |= O_SYNC;
1051 spin_unlock(&file->f_lock);
1054 /* Write the data. */
1055 oldfs = get_fs(); set_fs(KERNEL_DS);
1056 host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
1057 set_fs(oldfs);
1058 if (host_err < 0)
1059 goto out_nfserr;
1060 *cnt = host_err;
1061 nfsdstats.io_write += host_err;
1062 fsnotify_modify(file->f_path.dentry);
1064 /* clear setuid/setgid flag after write */
1065 if (inode->i_mode & (S_ISUID | S_ISGID))
1066 kill_suid(dentry);
1068 if (stable && use_wgather)
1069 host_err = wait_for_concurrent_writes(file);
1071 out_nfserr:
1072 dprintk("nfsd: write complete host_err=%d\n", host_err);
1073 if (host_err >= 0)
1074 err = 0;
1075 else
1076 err = nfserrno(host_err);
1077 out:
1078 return err;
1082 * Read data from a file. count must contain the requested read count
1083 * on entry. On return, *count contains the number of bytes actually read.
1084 * N.B. After this call fhp needs an fh_put
1086 __be32
1087 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1088 loff_t offset, struct kvec *vec, int vlen,
1089 unsigned long *count)
1091 __be32 err;
1093 if (file) {
1094 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
1095 NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
1096 if (err)
1097 goto out;
1098 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1099 } else {
1100 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
1101 if (err)
1102 goto out;
1103 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1104 nfsd_close(file);
1106 out:
1107 return err;
1111 * Write data to a file.
1112 * The stable flag requests synchronous writes.
1113 * N.B. After this call fhp needs an fh_put
1115 __be32
1116 nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1117 loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt,
1118 int *stablep)
1120 __be32 err = 0;
1122 if (file) {
1123 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
1124 NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE);
1125 if (err)
1126 goto out;
1127 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
1128 stablep);
1129 } else {
1130 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
1131 if (err)
1132 goto out;
1134 if (cnt)
1135 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
1136 cnt, stablep);
1137 nfsd_close(file);
1139 out:
1140 return err;
1143 #ifdef CONFIG_NFSD_V3
1145 * Commit all pending writes to stable storage.
1146 * Strictly speaking, we could sync just the indicated file region here,
1147 * but there's currently no way we can ask the VFS to do so.
1149 * Unfortunately we cannot lock the file to make sure we return full WCC
1150 * data to the client, as locking happens lower down in the filesystem.
1152 __be32
1153 nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
1154 loff_t offset, unsigned long count)
1156 struct file *file;
1157 __be32 err;
1159 if ((u64)count > ~(u64)offset)
1160 return nfserr_inval;
1162 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
1163 if (err)
1164 return err;
1165 if (EX_ISSYNC(fhp->fh_export)) {
1166 if (file->f_op && file->f_op->fsync) {
1167 err = nfserrno(nfsd_sync(file));
1168 } else {
1169 err = nfserr_notsupp;
1173 nfsd_close(file);
1174 return err;
1176 #endif /* CONFIG_NFSD_V3 */
1178 static __be32
1179 nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp,
1180 struct iattr *iap)
1183 * Mode has already been set earlier in create:
1185 iap->ia_valid &= ~ATTR_MODE;
1187 * Setting uid/gid works only for root. Irix appears to
1188 * send along the gid on create when it tries to implement
1189 * setgid directories via NFS:
1191 if (current_fsuid() != 0)
1192 iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
1193 if (iap->ia_valid)
1194 return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1195 return 0;
1198 /* HPUX client sometimes creates a file in mode 000, and sets size to 0.
1199 * setting size to 0 may fail for some specific file systems by the permission
1200 * checking which requires WRITE permission but the mode is 000.
1201 * we ignore the resizing(to 0) on the just new created file, since the size is
1202 * 0 after file created.
1204 * call this only after vfs_create() is called.
1205 * */
1206 static void
1207 nfsd_check_ignore_resizing(struct iattr *iap)
1209 if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
1210 iap->ia_valid &= ~ATTR_SIZE;
1214 * Create a file (regular, directory, device, fifo); UNIX sockets
1215 * not yet implemented.
1216 * If the response fh has been verified, the parent directory should
1217 * already be locked. Note that the parent directory is left locked.
1219 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1221 __be32
1222 nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
1223 char *fname, int flen, struct iattr *iap,
1224 int type, dev_t rdev, struct svc_fh *resfhp)
1226 struct dentry *dentry, *dchild = NULL;
1227 struct inode *dirp;
1228 __be32 err;
1229 __be32 err2;
1230 int host_err;
1232 err = nfserr_perm;
1233 if (!flen)
1234 goto out;
1235 err = nfserr_exist;
1236 if (isdotent(fname, flen))
1237 goto out;
1239 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1240 if (err)
1241 goto out;
1243 dentry = fhp->fh_dentry;
1244 dirp = dentry->d_inode;
1246 err = nfserr_notdir;
1247 if (!dirp->i_op->lookup)
1248 goto out;
1250 * Check whether the response file handle has been verified yet.
1251 * If it has, the parent directory should already be locked.
1253 if (!resfhp->fh_dentry) {
1254 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1255 fh_lock_nested(fhp, I_MUTEX_PARENT);
1256 dchild = lookup_one_len(fname, dentry, flen);
1257 host_err = PTR_ERR(dchild);
1258 if (IS_ERR(dchild))
1259 goto out_nfserr;
1260 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1261 if (err)
1262 goto out;
1263 } else {
1264 /* called from nfsd_proc_create */
1265 dchild = dget(resfhp->fh_dentry);
1266 if (!fhp->fh_locked) {
1267 /* not actually possible */
1268 printk(KERN_ERR
1269 "nfsd_create: parent %s/%s not locked!\n",
1270 dentry->d_parent->d_name.name,
1271 dentry->d_name.name);
1272 err = nfserr_io;
1273 goto out;
1277 * Make sure the child dentry is still negative ...
1279 err = nfserr_exist;
1280 if (dchild->d_inode) {
1281 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1282 dentry->d_name.name, dchild->d_name.name);
1283 goto out;
1286 if (!(iap->ia_valid & ATTR_MODE))
1287 iap->ia_mode = 0;
1288 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1290 err = nfserr_inval;
1291 if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) {
1292 printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
1293 type);
1294 goto out;
1297 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1298 if (host_err)
1299 goto out_nfserr;
1302 * Get the dir op function pointer.
1304 err = 0;
1305 switch (type) {
1306 case S_IFREG:
1307 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1308 if (!host_err)
1309 nfsd_check_ignore_resizing(iap);
1310 break;
1311 case S_IFDIR:
1312 host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1313 break;
1314 case S_IFCHR:
1315 case S_IFBLK:
1316 case S_IFIFO:
1317 case S_IFSOCK:
1318 host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1319 break;
1321 if (host_err < 0) {
1322 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1323 goto out_nfserr;
1326 if (EX_ISSYNC(fhp->fh_export)) {
1327 err = nfserrno(nfsd_sync_dir(dentry));
1328 write_inode_now(dchild->d_inode, 1);
1331 err2 = nfsd_create_setattr(rqstp, resfhp, iap);
1332 if (err2)
1333 err = err2;
1334 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1336 * Update the file handle to get the new inode info.
1338 if (!err)
1339 err = fh_update(resfhp);
1340 out:
1341 if (dchild && !IS_ERR(dchild))
1342 dput(dchild);
1343 return err;
1345 out_nfserr:
1346 err = nfserrno(host_err);
1347 goto out;
1350 #ifdef CONFIG_NFSD_V3
1352 * NFSv3 version of nfsd_create
1354 __be32
1355 nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1356 char *fname, int flen, struct iattr *iap,
1357 struct svc_fh *resfhp, int createmode, u32 *verifier,
1358 int *truncp, int *created)
1360 struct dentry *dentry, *dchild = NULL;
1361 struct inode *dirp;
1362 __be32 err;
1363 __be32 err2;
1364 int host_err;
1365 __u32 v_mtime=0, v_atime=0;
1367 err = nfserr_perm;
1368 if (!flen)
1369 goto out;
1370 err = nfserr_exist;
1371 if (isdotent(fname, flen))
1372 goto out;
1373 if (!(iap->ia_valid & ATTR_MODE))
1374 iap->ia_mode = 0;
1375 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1376 if (err)
1377 goto out;
1379 dentry = fhp->fh_dentry;
1380 dirp = dentry->d_inode;
1382 /* Get all the sanity checks out of the way before
1383 * we lock the parent. */
1384 err = nfserr_notdir;
1385 if (!dirp->i_op->lookup)
1386 goto out;
1387 fh_lock_nested(fhp, I_MUTEX_PARENT);
1390 * Compose the response file handle.
1392 dchild = lookup_one_len(fname, dentry, flen);
1393 host_err = PTR_ERR(dchild);
1394 if (IS_ERR(dchild))
1395 goto out_nfserr;
1397 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1398 if (err)
1399 goto out;
1401 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1402 /* solaris7 gets confused (bugid 4218508) if these have
1403 * the high bit set, so just clear the high bits. If this is
1404 * ever changed to use different attrs for storing the
1405 * verifier, then do_open_lookup() will also need to be fixed
1406 * accordingly.
1408 v_mtime = verifier[0]&0x7fffffff;
1409 v_atime = verifier[1]&0x7fffffff;
1412 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1413 if (host_err)
1414 goto out_nfserr;
1415 if (dchild->d_inode) {
1416 err = 0;
1418 switch (createmode) {
1419 case NFS3_CREATE_UNCHECKED:
1420 if (! S_ISREG(dchild->d_inode->i_mode))
1421 err = nfserr_exist;
1422 else if (truncp) {
1423 /* in nfsv4, we need to treat this case a little
1424 * differently. we don't want to truncate the
1425 * file now; this would be wrong if the OPEN
1426 * fails for some other reason. furthermore,
1427 * if the size is nonzero, we should ignore it
1428 * according to spec!
1430 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1432 else {
1433 iap->ia_valid &= ATTR_SIZE;
1434 goto set_attr;
1436 break;
1437 case NFS3_CREATE_EXCLUSIVE:
1438 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
1439 && dchild->d_inode->i_atime.tv_sec == v_atime
1440 && dchild->d_inode->i_size == 0 )
1441 break;
1442 /* fallthru */
1443 case NFS3_CREATE_GUARDED:
1444 err = nfserr_exist;
1446 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1447 goto out;
1450 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1451 if (host_err < 0) {
1452 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1453 goto out_nfserr;
1455 if (created)
1456 *created = 1;
1458 if (EX_ISSYNC(fhp->fh_export)) {
1459 err = nfserrno(nfsd_sync_dir(dentry));
1460 /* setattr will sync the child (or not) */
1463 nfsd_check_ignore_resizing(iap);
1465 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1466 /* Cram the verifier into atime/mtime */
1467 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1468 | ATTR_MTIME_SET|ATTR_ATIME_SET;
1469 /* XXX someone who knows this better please fix it for nsec */
1470 iap->ia_mtime.tv_sec = v_mtime;
1471 iap->ia_atime.tv_sec = v_atime;
1472 iap->ia_mtime.tv_nsec = 0;
1473 iap->ia_atime.tv_nsec = 0;
1476 set_attr:
1477 err2 = nfsd_create_setattr(rqstp, resfhp, iap);
1478 if (err2)
1479 err = err2;
1481 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1483 * Update the filehandle to get the new inode info.
1485 if (!err)
1486 err = fh_update(resfhp);
1488 out:
1489 fh_unlock(fhp);
1490 if (dchild && !IS_ERR(dchild))
1491 dput(dchild);
1492 return err;
1494 out_nfserr:
1495 err = nfserrno(host_err);
1496 goto out;
1498 #endif /* CONFIG_NFSD_V3 */
1501 * Read a symlink. On entry, *lenp must contain the maximum path length that
1502 * fits into the buffer. On return, it contains the true length.
1503 * N.B. After this call fhp needs an fh_put
1505 __be32
1506 nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1508 struct dentry *dentry;
1509 struct inode *inode;
1510 mm_segment_t oldfs;
1511 __be32 err;
1512 int host_err;
1514 err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP);
1515 if (err)
1516 goto out;
1518 dentry = fhp->fh_dentry;
1519 inode = dentry->d_inode;
1521 err = nfserr_inval;
1522 if (!inode->i_op->readlink)
1523 goto out;
1525 touch_atime(fhp->fh_export->ex_path.mnt, dentry);
1526 /* N.B. Why does this call need a get_fs()??
1527 * Remove the set_fs and watch the fireworks:-) --okir
1530 oldfs = get_fs(); set_fs(KERNEL_DS);
1531 host_err = inode->i_op->readlink(dentry, buf, *lenp);
1532 set_fs(oldfs);
1534 if (host_err < 0)
1535 goto out_nfserr;
1536 *lenp = host_err;
1537 err = 0;
1538 out:
1539 return err;
1541 out_nfserr:
1542 err = nfserrno(host_err);
1543 goto out;
1547 * Create a symlink and look up its inode
1548 * N.B. After this call _both_ fhp and resfhp need an fh_put
1550 __be32
1551 nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1552 char *fname, int flen,
1553 char *path, int plen,
1554 struct svc_fh *resfhp,
1555 struct iattr *iap)
1557 struct dentry *dentry, *dnew;
1558 __be32 err, cerr;
1559 int host_err;
1561 err = nfserr_noent;
1562 if (!flen || !plen)
1563 goto out;
1564 err = nfserr_exist;
1565 if (isdotent(fname, flen))
1566 goto out;
1568 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1569 if (err)
1570 goto out;
1571 fh_lock(fhp);
1572 dentry = fhp->fh_dentry;
1573 dnew = lookup_one_len(fname, dentry, flen);
1574 host_err = PTR_ERR(dnew);
1575 if (IS_ERR(dnew))
1576 goto out_nfserr;
1578 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1579 if (host_err)
1580 goto out_nfserr;
1582 if (unlikely(path[plen] != 0)) {
1583 char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1584 if (path_alloced == NULL)
1585 host_err = -ENOMEM;
1586 else {
1587 strncpy(path_alloced, path, plen);
1588 path_alloced[plen] = 0;
1589 host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced);
1590 kfree(path_alloced);
1592 } else
1593 host_err = vfs_symlink(dentry->d_inode, dnew, path);
1595 if (!host_err) {
1596 if (EX_ISSYNC(fhp->fh_export))
1597 host_err = nfsd_sync_dir(dentry);
1599 err = nfserrno(host_err);
1600 fh_unlock(fhp);
1602 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1604 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1605 dput(dnew);
1606 if (err==0) err = cerr;
1607 out:
1608 return err;
1610 out_nfserr:
1611 err = nfserrno(host_err);
1612 goto out;
1616 * Create a hardlink
1617 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1619 __be32
1620 nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1621 char *name, int len, struct svc_fh *tfhp)
1623 struct dentry *ddir, *dnew, *dold;
1624 struct inode *dirp, *dest;
1625 __be32 err;
1626 int host_err;
1628 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE);
1629 if (err)
1630 goto out;
1631 err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP);
1632 if (err)
1633 goto out;
1635 err = nfserr_perm;
1636 if (!len)
1637 goto out;
1638 err = nfserr_exist;
1639 if (isdotent(name, len))
1640 goto out;
1642 fh_lock_nested(ffhp, I_MUTEX_PARENT);
1643 ddir = ffhp->fh_dentry;
1644 dirp = ddir->d_inode;
1646 dnew = lookup_one_len(name, ddir, len);
1647 host_err = PTR_ERR(dnew);
1648 if (IS_ERR(dnew))
1649 goto out_nfserr;
1651 dold = tfhp->fh_dentry;
1652 dest = dold->d_inode;
1654 host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt);
1655 if (host_err) {
1656 err = nfserrno(host_err);
1657 goto out_dput;
1659 host_err = vfs_link(dold, dirp, dnew);
1660 if (!host_err) {
1661 if (EX_ISSYNC(ffhp->fh_export)) {
1662 err = nfserrno(nfsd_sync_dir(ddir));
1663 write_inode_now(dest, 1);
1665 err = 0;
1666 } else {
1667 if (host_err == -EXDEV && rqstp->rq_vers == 2)
1668 err = nfserr_acces;
1669 else
1670 err = nfserrno(host_err);
1672 mnt_drop_write(tfhp->fh_export->ex_path.mnt);
1673 out_dput:
1674 dput(dnew);
1675 out_unlock:
1676 fh_unlock(ffhp);
1677 out:
1678 return err;
1680 out_nfserr:
1681 err = nfserrno(host_err);
1682 goto out_unlock;
1686 * Rename a file
1687 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1689 __be32
1690 nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1691 struct svc_fh *tfhp, char *tname, int tlen)
1693 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap;
1694 struct inode *fdir, *tdir;
1695 __be32 err;
1696 int host_err;
1698 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE);
1699 if (err)
1700 goto out;
1701 err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE);
1702 if (err)
1703 goto out;
1705 fdentry = ffhp->fh_dentry;
1706 fdir = fdentry->d_inode;
1708 tdentry = tfhp->fh_dentry;
1709 tdir = tdentry->d_inode;
1711 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1712 if (ffhp->fh_export != tfhp->fh_export)
1713 goto out;
1715 err = nfserr_perm;
1716 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1717 goto out;
1719 /* cannot use fh_lock as we need deadlock protective ordering
1720 * so do it by hand */
1721 trap = lock_rename(tdentry, fdentry);
1722 ffhp->fh_locked = tfhp->fh_locked = 1;
1723 fill_pre_wcc(ffhp);
1724 fill_pre_wcc(tfhp);
1726 odentry = lookup_one_len(fname, fdentry, flen);
1727 host_err = PTR_ERR(odentry);
1728 if (IS_ERR(odentry))
1729 goto out_nfserr;
1731 host_err = -ENOENT;
1732 if (!odentry->d_inode)
1733 goto out_dput_old;
1734 host_err = -EINVAL;
1735 if (odentry == trap)
1736 goto out_dput_old;
1738 ndentry = lookup_one_len(tname, tdentry, tlen);
1739 host_err = PTR_ERR(ndentry);
1740 if (IS_ERR(ndentry))
1741 goto out_dput_old;
1742 host_err = -ENOTEMPTY;
1743 if (ndentry == trap)
1744 goto out_dput_new;
1746 if (svc_msnfs(ffhp) &&
1747 ((atomic_read(&odentry->d_count) > 1)
1748 || (atomic_read(&ndentry->d_count) > 1))) {
1749 host_err = -EPERM;
1750 goto out_dput_new;
1753 host_err = -EXDEV;
1754 if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt)
1755 goto out_dput_new;
1756 host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt);
1757 if (host_err)
1758 goto out_dput_new;
1760 host_err = vfs_rename(fdir, odentry, tdir, ndentry);
1761 if (!host_err && EX_ISSYNC(tfhp->fh_export)) {
1762 host_err = nfsd_sync_dir(tdentry);
1763 if (!host_err)
1764 host_err = nfsd_sync_dir(fdentry);
1767 mnt_drop_write(ffhp->fh_export->ex_path.mnt);
1769 out_dput_new:
1770 dput(ndentry);
1771 out_dput_old:
1772 dput(odentry);
1773 out_nfserr:
1774 err = nfserrno(host_err);
1776 /* we cannot reply on fh_unlock on the two filehandles,
1777 * as that would do the wrong thing if the two directories
1778 * were the same, so again we do it by hand
1780 fill_post_wcc(ffhp);
1781 fill_post_wcc(tfhp);
1782 unlock_rename(tdentry, fdentry);
1783 ffhp->fh_locked = tfhp->fh_locked = 0;
1785 out:
1786 return err;
1790 * Unlink a file or directory
1791 * N.B. After this call fhp needs an fh_put
1793 __be32
1794 nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1795 char *fname, int flen)
1797 struct dentry *dentry, *rdentry;
1798 struct inode *dirp;
1799 __be32 err;
1800 int host_err;
1802 err = nfserr_acces;
1803 if (!flen || isdotent(fname, flen))
1804 goto out;
1805 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE);
1806 if (err)
1807 goto out;
1809 fh_lock_nested(fhp, I_MUTEX_PARENT);
1810 dentry = fhp->fh_dentry;
1811 dirp = dentry->d_inode;
1813 rdentry = lookup_one_len(fname, dentry, flen);
1814 host_err = PTR_ERR(rdentry);
1815 if (IS_ERR(rdentry))
1816 goto out_nfserr;
1818 if (!rdentry->d_inode) {
1819 dput(rdentry);
1820 err = nfserr_noent;
1821 goto out;
1824 if (!type)
1825 type = rdentry->d_inode->i_mode & S_IFMT;
1827 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1828 if (host_err)
1829 goto out_nfserr;
1831 if (type != S_IFDIR) { /* It's UNLINK */
1832 #ifdef MSNFS
1833 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1834 (atomic_read(&rdentry->d_count) > 1)) {
1835 host_err = -EPERM;
1836 } else
1837 #endif
1838 host_err = vfs_unlink(dirp, rdentry);
1839 } else { /* It's RMDIR */
1840 host_err = vfs_rmdir(dirp, rdentry);
1843 dput(rdentry);
1845 if (host_err)
1846 goto out_drop;
1847 if (EX_ISSYNC(fhp->fh_export))
1848 host_err = nfsd_sync_dir(dentry);
1850 out_drop:
1851 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1852 out_nfserr:
1853 err = nfserrno(host_err);
1854 out:
1855 return err;
1859 * We do this buffering because we must not call back into the file
1860 * system's ->lookup() method from the filldir callback. That may well
1861 * deadlock a number of file systems.
1863 * This is based heavily on the implementation of same in XFS.
1865 struct buffered_dirent {
1866 u64 ino;
1867 loff_t offset;
1868 int namlen;
1869 unsigned int d_type;
1870 char name[];
1873 struct readdir_data {
1874 char *dirent;
1875 size_t used;
1876 int full;
1879 static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen,
1880 loff_t offset, u64 ino, unsigned int d_type)
1882 struct readdir_data *buf = __buf;
1883 struct buffered_dirent *de = (void *)(buf->dirent + buf->used);
1884 unsigned int reclen;
1886 reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64));
1887 if (buf->used + reclen > PAGE_SIZE) {
1888 buf->full = 1;
1889 return -EINVAL;
1892 de->namlen = namlen;
1893 de->offset = offset;
1894 de->ino = ino;
1895 de->d_type = d_type;
1896 memcpy(de->name, name, namlen);
1897 buf->used += reclen;
1899 return 0;
1902 static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func,
1903 struct readdir_cd *cdp, loff_t *offsetp)
1905 struct readdir_data buf;
1906 struct buffered_dirent *de;
1907 int host_err;
1908 int size;
1909 loff_t offset;
1911 buf.dirent = (void *)__get_free_page(GFP_KERNEL);
1912 if (!buf.dirent)
1913 return nfserrno(-ENOMEM);
1915 offset = *offsetp;
1917 while (1) {
1918 struct inode *dir_inode = file->f_path.dentry->d_inode;
1919 unsigned int reclen;
1921 cdp->err = nfserr_eof; /* will be cleared on successful read */
1922 buf.used = 0;
1923 buf.full = 0;
1925 host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf);
1926 if (buf.full)
1927 host_err = 0;
1929 if (host_err < 0)
1930 break;
1932 size = buf.used;
1934 if (!size)
1935 break;
1938 * Various filldir functions may end up calling back into
1939 * lookup_one_len() and the file system's ->lookup() method.
1940 * These expect i_mutex to be held, as it would within readdir.
1942 host_err = mutex_lock_killable(&dir_inode->i_mutex);
1943 if (host_err)
1944 break;
1946 de = (struct buffered_dirent *)buf.dirent;
1947 while (size > 0) {
1948 offset = de->offset;
1950 if (func(cdp, de->name, de->namlen, de->offset,
1951 de->ino, de->d_type))
1952 break;
1954 if (cdp->err != nfs_ok)
1955 break;
1957 reclen = ALIGN(sizeof(*de) + de->namlen,
1958 sizeof(u64));
1959 size -= reclen;
1960 de = (struct buffered_dirent *)((char *)de + reclen);
1962 mutex_unlock(&dir_inode->i_mutex);
1963 if (size > 0) /* We bailed out early */
1964 break;
1966 offset = vfs_llseek(file, 0, SEEK_CUR);
1969 free_page((unsigned long)(buf.dirent));
1971 if (host_err)
1972 return nfserrno(host_err);
1974 *offsetp = offset;
1975 return cdp->err;
1979 * Read entries from a directory.
1980 * The NFSv3/4 verifier we ignore for now.
1982 __be32
1983 nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
1984 struct readdir_cd *cdp, filldir_t func)
1986 __be32 err;
1987 struct file *file;
1988 loff_t offset = *offsetp;
1990 err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file);
1991 if (err)
1992 goto out;
1994 offset = vfs_llseek(file, offset, 0);
1995 if (offset < 0) {
1996 err = nfserrno((int)offset);
1997 goto out_close;
2000 err = nfsd_buffered_readdir(file, func, cdp, offsetp);
2002 if (err == nfserr_eof || err == nfserr_toosmall)
2003 err = nfs_ok; /* can still be found in ->err */
2004 out_close:
2005 nfsd_close(file);
2006 out:
2007 return err;
2011 * Get file system stats
2012 * N.B. After this call fhp needs an fh_put
2014 __be32
2015 nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access)
2017 __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access);
2018 if (!err && vfs_statfs(fhp->fh_dentry,stat))
2019 err = nfserr_io;
2020 return err;
2023 static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp)
2025 return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY;
2029 * Check for a user's access permissions to this inode.
2031 __be32
2032 nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
2033 struct dentry *dentry, int acc)
2035 struct inode *inode = dentry->d_inode;
2036 struct path path;
2037 int err;
2039 if (acc == NFSD_MAY_NOP)
2040 return 0;
2041 #if 0
2042 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
2043 acc,
2044 (acc & NFSD_MAY_READ)? " read" : "",
2045 (acc & NFSD_MAY_WRITE)? " write" : "",
2046 (acc & NFSD_MAY_EXEC)? " exec" : "",
2047 (acc & NFSD_MAY_SATTR)? " sattr" : "",
2048 (acc & NFSD_MAY_TRUNC)? " trunc" : "",
2049 (acc & NFSD_MAY_LOCK)? " lock" : "",
2050 (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "",
2051 inode->i_mode,
2052 IS_IMMUTABLE(inode)? " immut" : "",
2053 IS_APPEND(inode)? " append" : "",
2054 __mnt_is_readonly(exp->ex_path.mnt)? " ro" : "");
2055 dprintk(" owner %d/%d user %d/%d\n",
2056 inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid());
2057 #endif
2059 /* Normally we reject any write/sattr etc access on a read-only file
2060 * system. But if it is IRIX doing check on write-access for a
2061 * device special file, we ignore rofs.
2063 if (!(acc & NFSD_MAY_LOCAL_ACCESS))
2064 if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) {
2065 if (exp_rdonly(rqstp, exp) ||
2066 __mnt_is_readonly(exp->ex_path.mnt))
2067 return nfserr_rofs;
2068 if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode))
2069 return nfserr_perm;
2071 if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode))
2072 return nfserr_perm;
2074 if (acc & NFSD_MAY_LOCK) {
2075 /* If we cannot rely on authentication in NLM requests,
2076 * just allow locks, otherwise require read permission, or
2077 * ownership
2079 if (exp->ex_flags & NFSEXP_NOAUTHNLM)
2080 return 0;
2081 else
2082 acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE;
2085 * The file owner always gets access permission for accesses that
2086 * would normally be checked at open time. This is to make
2087 * file access work even when the client has done a fchmod(fd, 0).
2089 * However, `cp foo bar' should fail nevertheless when bar is
2090 * readonly. A sensible way to do this might be to reject all
2091 * attempts to truncate a read-only file, because a creat() call
2092 * always implies file truncation.
2093 * ... but this isn't really fair. A process may reasonably call
2094 * ftruncate on an open file descriptor on a file with perm 000.
2095 * We must trust the client to do permission checking - using "ACCESS"
2096 * with NFSv3.
2098 if ((acc & NFSD_MAY_OWNER_OVERRIDE) &&
2099 inode->i_uid == current_fsuid())
2100 return 0;
2102 /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */
2103 err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC));
2105 /* Allow read access to binaries even when mode 111 */
2106 if (err == -EACCES && S_ISREG(inode->i_mode) &&
2107 acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE))
2108 err = inode_permission(inode, MAY_EXEC);
2109 if (err)
2110 goto nfsd_out;
2112 /* Do integrity (permission) checking now, but defer incrementing
2113 * IMA counts to the actual file open.
2115 path.mnt = exp->ex_path.mnt;
2116 path.dentry = dentry;
2117 err = ima_path_check(&path, acc & (MAY_READ | MAY_WRITE | MAY_EXEC),
2118 IMA_COUNT_LEAVE);
2119 nfsd_out:
2120 return err? nfserrno(err) : 0;
2123 void
2124 nfsd_racache_shutdown(void)
2126 struct raparms *raparm, *last_raparm;
2127 unsigned int i;
2129 dprintk("nfsd: freeing readahead buffers.\n");
2131 for (i = 0; i < RAPARM_HASH_SIZE; i++) {
2132 raparm = raparm_hash[i].pb_head;
2133 while(raparm) {
2134 last_raparm = raparm;
2135 raparm = raparm->p_next;
2136 kfree(last_raparm);
2138 raparm_hash[i].pb_head = NULL;
2142 * Initialize readahead param cache
2145 nfsd_racache_init(int cache_size)
2147 int i;
2148 int j = 0;
2149 int nperbucket;
2150 struct raparms **raparm = NULL;
2153 if (raparm_hash[0].pb_head)
2154 return 0;
2155 nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE);
2156 if (nperbucket < 2)
2157 nperbucket = 2;
2158 cache_size = nperbucket * RAPARM_HASH_SIZE;
2160 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size);
2162 for (i = 0; i < RAPARM_HASH_SIZE; i++) {
2163 spin_lock_init(&raparm_hash[i].pb_lock);
2165 raparm = &raparm_hash[i].pb_head;
2166 for (j = 0; j < nperbucket; j++) {
2167 *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL);
2168 if (!*raparm)
2169 goto out_nomem;
2170 raparm = &(*raparm)->p_next;
2172 *raparm = NULL;
2175 nfsdstats.ra_size = cache_size;
2176 return 0;
2178 out_nomem:
2179 dprintk("nfsd: kmalloc failed, freeing readahead buffers\n");
2180 nfsd_racache_shutdown();
2181 return -ENOMEM;
2184 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
2185 struct posix_acl *
2186 nfsd_get_posix_acl(struct svc_fh *fhp, int type)
2188 struct inode *inode = fhp->fh_dentry->d_inode;
2189 char *name;
2190 void *value = NULL;
2191 ssize_t size;
2192 struct posix_acl *acl;
2194 if (!IS_POSIXACL(inode))
2195 return ERR_PTR(-EOPNOTSUPP);
2197 switch (type) {
2198 case ACL_TYPE_ACCESS:
2199 name = POSIX_ACL_XATTR_ACCESS;
2200 break;
2201 case ACL_TYPE_DEFAULT:
2202 name = POSIX_ACL_XATTR_DEFAULT;
2203 break;
2204 default:
2205 return ERR_PTR(-EOPNOTSUPP);
2208 size = nfsd_getxattr(fhp->fh_dentry, name, &value);
2209 if (size < 0)
2210 return ERR_PTR(size);
2212 acl = posix_acl_from_xattr(value, size);
2213 kfree(value);
2214 return acl;
2218 nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
2220 struct inode *inode = fhp->fh_dentry->d_inode;
2221 char *name;
2222 void *value = NULL;
2223 size_t size;
2224 int error;
2226 if (!IS_POSIXACL(inode) ||
2227 !inode->i_op->setxattr || !inode->i_op->removexattr)
2228 return -EOPNOTSUPP;
2229 switch(type) {
2230 case ACL_TYPE_ACCESS:
2231 name = POSIX_ACL_XATTR_ACCESS;
2232 break;
2233 case ACL_TYPE_DEFAULT:
2234 name = POSIX_ACL_XATTR_DEFAULT;
2235 break;
2236 default:
2237 return -EOPNOTSUPP;
2240 if (acl && acl->a_count) {
2241 size = posix_acl_xattr_size(acl->a_count);
2242 value = kmalloc(size, GFP_KERNEL);
2243 if (!value)
2244 return -ENOMEM;
2245 error = posix_acl_to_xattr(acl, value, size);
2246 if (error < 0)
2247 goto getout;
2248 size = error;
2249 } else
2250 size = 0;
2252 error = mnt_want_write(fhp->fh_export->ex_path.mnt);
2253 if (error)
2254 goto getout;
2255 if (size)
2256 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
2257 else {
2258 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
2259 error = 0;
2260 else {
2261 error = vfs_removexattr(fhp->fh_dentry, name);
2262 if (error == -ENODATA)
2263 error = 0;
2266 mnt_drop_write(fhp->fh_export->ex_path.mnt);
2268 getout:
2269 kfree(value);
2270 return error;
2272 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */