1 #define MSNFS /* HACK HACK */
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/config.h>
20 #include <linux/string.h>
21 #include <linux/time.h>
22 #include <linux/errno.h>
24 #include <linux/file.h>
25 #include <linux/mount.h>
26 #include <linux/major.h>
27 #include <linux/ext2_fs.h>
28 #include <linux/proc_fs.h>
29 #include <linux/stat.h>
30 #include <linux/fcntl.h>
31 #include <linux/net.h>
32 #include <linux/unistd.h>
33 #include <linux/slab.h>
34 #include <linux/pagemap.h>
36 #include <linux/module.h>
37 #include <linux/namei.h>
38 #include <linux/vfs.h>
39 #include <linux/delay.h>
40 #include <linux/sunrpc/svc.h>
41 #include <linux/nfsd/nfsd.h>
43 #include <linux/nfs3.h>
44 #include <linux/nfsd/xdr3.h>
45 #endif /* CONFIG_NFSD_V3 */
46 #include <linux/nfsd/nfsfh.h>
47 #include <linux/quotaops.h>
48 #include <linux/fsnotify.h>
49 #include <linux/posix_acl.h>
50 #include <linux/posix_acl_xattr.h>
51 #include <linux/xattr.h>
53 #include <linux/nfs4.h>
54 #include <linux/nfs4_acl.h>
55 #include <linux/nfsd_idmap.h>
56 #include <linux/security.h>
57 #endif /* CONFIG_NFSD_V4 */
59 #include <asm/uaccess.h>
61 #define NFSDDBG_FACILITY NFSDDBG_FILEOP
65 /* We must ignore files (but only files) which might have mandatory
66 * locks on them because there is no way to know if the accesser has
69 #define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i))
72 * This is a cache of readahead params that help us choose the proper
73 * readahead strategy. Initially, we set all readahead parameters to 0
74 * and let the VFS handle things.
75 * If you increase the number of cached files very much, you'll need to
76 * add a hash table here.
79 struct raparms *p_next;
84 struct file_ra_state p_ra;
87 static struct raparms * raparml;
88 static struct raparms * raparm_cache;
91 * Called from nfsd_lookup and encode_dirent. Check if we have crossed
93 * Returns -EAGAIN leaving *dpp and *expp unchanged,
94 * or nfs_ok having possibly changed *dpp and *expp
97 nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
98 struct svc_export **expp)
100 struct svc_export *exp = *expp, *exp2 = NULL;
101 struct dentry *dentry = *dpp;
102 struct vfsmount *mnt = mntget(exp->ex_mnt);
103 struct dentry *mounts = dget(dentry);
106 while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts));
108 exp2 = exp_get_by_name(exp->ex_client, mnt, mounts, &rqstp->rq_chandle);
115 if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) {
116 /* successfully crossed mount point */
122 if (exp2) exp_put(exp2);
131 * Look up one component of a pathname.
132 * N.B. After this call _both_ fhp and resfh need an fh_put
134 * If the lookup would cross a mountpoint, and the mounted filesystem
135 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
136 * accepted as it stands and the mounted directory is
137 * returned. Otherwise the covered directory is returned.
138 * NOTE: this mountpoint crossing is not supported properly by all
139 * clients and is explicitly disallowed for NFSv3
140 * NeilBrown <neilb@cse.unsw.edu.au>
143 nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
144 int len, struct svc_fh *resfh)
146 struct svc_export *exp;
147 struct dentry *dparent;
148 struct dentry *dentry;
151 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
153 /* Obtain dentry and export. */
154 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
158 dparent = fhp->fh_dentry;
159 exp = fhp->fh_export;
164 /* Lookup the name, but don't follow links */
165 if (isdotent(name, len)) {
167 dentry = dget(dparent);
168 else if (dparent != exp->ex_dentry) {
169 dentry = dget_parent(dparent);
170 } else if (!EX_NOHIDE(exp))
171 dentry = dget(dparent); /* .. == . just like at / */
173 /* checking mountpoint crossing is very different when stepping up */
174 struct svc_export *exp2 = NULL;
176 struct vfsmount *mnt = mntget(exp->ex_mnt);
177 dentry = dget(dparent);
178 while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry))
180 dp = dget_parent(dentry);
184 exp2 = exp_parent(exp->ex_client, mnt, dentry,
194 dentry = dget(dparent);
203 dentry = lookup_one_len(name, dparent, len);
204 err = PTR_ERR(dentry);
208 * check if we have crossed a mount point ...
210 if (d_mountpoint(dentry)) {
211 if ((err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
218 * Note: we compose the file handle now, but as the
219 * dentry may be negative, it may need to be updated.
221 err = fh_compose(resfh, exp, dentry, fhp);
222 if (!err && !dentry->d_inode)
235 * Set various file attributes.
236 * N.B. After this call fhp needs an fh_put
239 nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
240 int check_guard, time_t guardtime)
242 struct dentry *dentry;
244 int accmode = MAY_SATTR;
250 if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
251 accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE;
252 if (iap->ia_valid & ATTR_SIZE)
256 err = fh_verify(rqstp, fhp, ftype, accmode);
260 dentry = fhp->fh_dentry;
261 inode = dentry->d_inode;
263 /* Ignore any mode updates on symlinks */
264 if (S_ISLNK(inode->i_mode))
265 iap->ia_valid &= ~ATTR_MODE;
270 /* NFSv2 does not differentiate between "set-[ac]time-to-now"
271 * which only requires access, and "set-[ac]time-to-X" which
272 * requires ownership.
273 * So if it looks like it might be "set both to the same time which
274 * is close to now", and if inode_change_ok fails, then we
275 * convert to "set to now" instead of "set to explicit time"
277 * We only call inode_change_ok as the last test as technically
278 * it is not an interface that we should be using. It is only
279 * valid if the filesystem does not define it's own i_op->setattr.
281 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
282 #define MAX_TOUCH_TIME_ERROR (30*60)
283 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET
284 && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec
286 /* Looks probable. Now just make sure time is in the right ballpark.
287 * Solaris, at least, doesn't seem to care what the time request is.
288 * We require it be within 30 minutes of now.
290 time_t delta = iap->ia_atime.tv_sec - get_seconds();
291 if (delta<0) delta = -delta;
292 if (delta < MAX_TOUCH_TIME_ERROR &&
293 inode_change_ok(inode, iap) != 0) {
294 /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
295 * this will cause notify_change to set these times to "now"
297 iap->ia_valid &= ~BOTH_TIME_SET;
301 /* The size case is special. It changes the file as well as the attributes. */
302 if (iap->ia_valid & ATTR_SIZE) {
303 if (iap->ia_size < inode->i_size) {
304 err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
310 * If we are changing the size of the file, then
311 * we need to break all leases.
313 err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
314 if (err == -EWOULDBLOCK)
316 if (err) /* ENOMEM or EWOULDBLOCK */
319 err = get_write_access(inode);
324 err = locks_verify_truncate(inode, NULL, iap->ia_size);
326 put_write_access(inode);
333 * Tell a Hierarchical Storage Manager (e.g. via DMAPI) to
334 * return EAGAIN when an action would take minutes instead of
335 * milliseconds so that NFS can reply to the client with
336 * NFSERR_JUKEBOX instead of blocking an nfsd thread.
338 if (rqstp->rq_vers >= 3)
339 iap->ia_valid |= ATTR_NO_BLOCK;
342 imode = inode->i_mode;
343 if (iap->ia_valid & ATTR_MODE) {
344 iap->ia_mode &= S_IALLUGO;
345 imode = iap->ia_mode |= (imode & ~S_IALLUGO);
348 /* Revoke setuid/setgid bit on chown/chgrp */
349 if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid)
350 iap->ia_valid |= ATTR_KILL_SUID;
351 if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)
352 iap->ia_valid |= ATTR_KILL_SGID;
354 /* Change the attributes. */
356 iap->ia_valid |= ATTR_CTIME;
358 err = nfserr_notsync;
359 if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
361 err = notify_change(dentry, iap);
362 /* to get NFSERR_JUKEBOX on the wire, need -ETIMEDOUT */
369 put_write_access(inode);
371 if (EX_ISSYNC(fhp->fh_export))
372 write_inode_now(inode, 1);
381 #if defined(CONFIG_NFSD_V2_ACL) || \
382 defined(CONFIG_NFSD_V3_ACL) || \
383 defined(CONFIG_NFSD_V4)
384 static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
388 buflen = vfs_getxattr(dentry, key, NULL, 0);
392 *buf = kmalloc(buflen, GFP_KERNEL);
396 return vfs_getxattr(dentry, key, *buf, buflen);
400 #if defined(CONFIG_NFSD_V4)
402 set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
409 buflen = posix_acl_xattr_size(pacl->a_count);
410 buf = kmalloc(buflen, GFP_KERNEL);
415 len = posix_acl_to_xattr(pacl, buf, buflen);
421 error = vfs_setxattr(dentry, key, buf, len, 0);
428 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
429 struct nfs4_acl *acl)
432 struct dentry *dentry;
434 struct posix_acl *pacl = NULL, *dpacl = NULL;
435 unsigned int flags = 0;
438 error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR);
442 dentry = fhp->fh_dentry;
443 inode = dentry->d_inode;
444 if (S_ISDIR(inode->i_mode))
445 flags = NFS4_ACL_DIR;
447 error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
448 if (error == -EINVAL) {
449 error = nfserr_attrnotsupp;
451 } else if (error < 0)
455 error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
461 error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
469 posix_acl_release(pacl);
470 posix_acl_release(dpacl);
473 error = nfserrno(error);
477 static struct posix_acl *
478 _get_posix_acl(struct dentry *dentry, char *key)
481 struct posix_acl *pacl = NULL;
484 buflen = nfsd_getxattr(dentry, key, &buf);
488 return ERR_PTR(buflen);
490 pacl = posix_acl_from_xattr(buf, buflen);
496 nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
498 struct inode *inode = dentry->d_inode;
500 struct posix_acl *pacl = NULL, *dpacl = NULL;
501 unsigned int flags = 0;
503 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
504 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
505 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
507 error = PTR_ERR(pacl);
512 if (S_ISDIR(inode->i_mode)) {
513 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
514 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
516 else if (IS_ERR(dpacl)) {
517 error = PTR_ERR(dpacl);
521 flags = NFS4_ACL_DIR;
524 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
526 error = PTR_ERR(*acl);
530 posix_acl_release(pacl);
531 posix_acl_release(dpacl);
535 #endif /* defined(CONFIG_NFS_V4) */
537 #ifdef CONFIG_NFSD_V3
539 * Check server access rights to a file system object
545 static struct accessmap nfs3_regaccess[] = {
546 { NFS3_ACCESS_READ, MAY_READ },
547 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
548 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC },
549 { NFS3_ACCESS_EXTEND, MAY_WRITE },
554 static struct accessmap nfs3_diraccess[] = {
555 { NFS3_ACCESS_READ, MAY_READ },
556 { NFS3_ACCESS_LOOKUP, MAY_EXEC },
557 { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC },
558 { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE },
559 { NFS3_ACCESS_DELETE, MAY_REMOVE },
564 static struct accessmap nfs3_anyaccess[] = {
565 /* Some clients - Solaris 2.6 at least, make an access call
566 * to the server to check for access for things like /dev/null
567 * (which really, the server doesn't care about). So
568 * We provide simple access checking for them, looking
569 * mainly at mode bits, and we make sure to ignore read-only
572 { NFS3_ACCESS_READ, MAY_READ },
573 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
574 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS },
575 { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS },
581 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
583 struct accessmap *map;
584 struct svc_export *export;
585 struct dentry *dentry;
586 u32 query, result = 0, sresult = 0;
589 error = fh_verify(rqstp, fhp, 0, MAY_NOP);
593 export = fhp->fh_export;
594 dentry = fhp->fh_dentry;
596 if (S_ISREG(dentry->d_inode->i_mode))
597 map = nfs3_regaccess;
598 else if (S_ISDIR(dentry->d_inode->i_mode))
599 map = nfs3_diraccess;
601 map = nfs3_anyaccess;
605 for (; map->access; map++) {
606 if (map->access & query) {
609 sresult |= map->access;
611 err2 = nfsd_permission(export, dentry, map->how);
614 result |= map->access;
617 /* the following error codes just mean the access was not allowed,
618 * rather than an error occurred */
622 /* simply don't "or" in the access bit. */
632 *supported = sresult;
637 #endif /* CONFIG_NFSD_V3 */
642 * Open an existing file or directory.
643 * The access argument indicates the type of open (read/write/lock)
644 * N.B. After this call fhp needs an fh_put
647 nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
648 int access, struct file **filp)
650 struct dentry *dentry;
652 int flags = O_RDONLY|O_LARGEFILE, err;
655 * If we get here, then the client has already done an "open",
656 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
657 * in case a chmod has now revoked permission.
659 err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE);
663 dentry = fhp->fh_dentry;
664 inode = dentry->d_inode;
666 /* Disallow write access to files with the append-only bit set
667 * or any access when mandatory locking enabled
670 if (IS_APPEND(inode) && (access & MAY_WRITE))
672 if (IS_ISMNDLK(inode))
679 * Check to see if there are any leases on this file.
680 * This may block while leases are broken.
682 err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0));
683 if (err == -EWOULDBLOCK)
685 if (err) /* NOMEM or WOULDBLOCK */
688 if (access & MAY_WRITE) {
689 flags = O_WRONLY|O_LARGEFILE;
693 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags);
695 err = PTR_ERR(*filp);
707 nfsd_close(struct file *filp)
714 * As this calls fsync (not fdatasync) there is no need for a write_inode
717 static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
718 const struct file_operations *fop)
720 struct inode *inode = dp->d_inode;
721 int (*fsync) (struct file *, struct dentry *, int);
724 err = filemap_fdatawrite(inode->i_mapping);
725 if (err == 0 && fop && (fsync = fop->fsync))
726 err = fsync(filp, dp, 0);
728 err = filemap_fdatawait(inode->i_mapping);
735 nfsd_sync(struct file *filp)
738 struct inode *inode = filp->f_dentry->d_inode;
739 dprintk("nfsd: sync file %s\n", filp->f_dentry->d_name.name);
740 mutex_lock(&inode->i_mutex);
741 err=nfsd_dosync(filp, filp->f_dentry, filp->f_op);
742 mutex_unlock(&inode->i_mutex);
748 nfsd_sync_dir(struct dentry *dp)
750 return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
754 * Obtain the readahead parameters for the file
755 * specified by (dev, ino).
757 static DEFINE_SPINLOCK(ra_lock);
759 static inline struct raparms *
760 nfsd_get_raparms(dev_t dev, ino_t ino)
762 struct raparms *ra, **rap, **frap = NULL;
766 for (rap = &raparm_cache; (ra = *rap); rap = &ra->p_next) {
767 if (ra->p_ino == ino && ra->p_dev == dev)
770 if (ra->p_count == 0)
773 depth = nfsdstats.ra_size*11/10;
775 spin_unlock(&ra_lock);
784 if (rap != &raparm_cache) {
786 ra->p_next = raparm_cache;
790 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
791 spin_unlock(&ra_lock);
796 * Grab and keep cached pages assosiated with a file in the svc_rqst
797 * so that they can be passed to the netowork sendmsg/sendpage routines
798 * directrly. They will be released after the sending has completed.
801 nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size)
803 unsigned long count = desc->count;
804 struct svc_rqst *rqstp = desc->arg.data;
809 if (rqstp->rq_res.page_len == 0) {
811 rqstp->rq_respages[rqstp->rq_resused++] = page;
812 rqstp->rq_res.page_base = offset;
813 rqstp->rq_res.page_len = size;
814 } else if (page != rqstp->rq_respages[rqstp->rq_resused-1]) {
816 rqstp->rq_respages[rqstp->rq_resused++] = page;
817 rqstp->rq_res.page_len += size;
819 rqstp->rq_res.page_len += size;
822 desc->count = count - size;
823 desc->written += size;
828 nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
829 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
837 inode = file->f_dentry->d_inode;
839 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
840 (!lock_may_read(inode, offset, *count)))
844 /* Get readahead parameters */
845 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
848 file->f_ra = ra->p_ra;
850 /* Support HSMs -- see comment in nfsd_setattr() */
851 if (rqstp->rq_vers >= 3)
852 file->f_flags |= O_NONBLOCK;
854 if (file->f_op->sendfile) {
855 svc_pushback_unused_pages(rqstp);
856 err = file->f_op->sendfile(file, &offset, *count,
857 nfsd_read_actor, rqstp);
861 err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
865 /* Write back readahead params */
868 ra->p_ra = file->f_ra;
871 spin_unlock(&ra_lock);
875 nfsdstats.io_read += err;
878 fsnotify_access(file->f_dentry);
880 /* to get NFSERR_JUKEBOX on the wire, need -ETIMEDOUT */
889 static void kill_suid(struct dentry *dentry)
892 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;
894 mutex_lock(&dentry->d_inode->i_mutex);
895 notify_change(dentry, &ia);
896 mutex_unlock(&dentry->d_inode->i_mutex);
900 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
901 loff_t offset, struct kvec *vec, int vlen,
902 unsigned long cnt, int *stablep)
904 struct svc_export *exp;
905 struct dentry *dentry;
909 int stable = *stablep;
914 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
915 (!lock_may_write(file->f_dentry->d_inode, offset, cnt)))
919 dentry = file->f_dentry;
920 inode = dentry->d_inode;
921 exp = fhp->fh_export;
924 * Request sync writes if
925 * - the sync export option has been set, or
926 * - the client requested O_SYNC behavior (NFSv3 feature).
927 * - The file system doesn't support fsync().
928 * When gathered writes have been configured for this volume,
929 * flushing the data to disk is handled separately below.
932 if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */
934 *stablep = 2; /* FILE_SYNC */
939 if (stable && !EX_WGATHER(exp))
940 file->f_flags |= O_SYNC;
942 /* Support HSMs -- see comment in nfsd_setattr() */
943 if (rqstp->rq_vers >= 3)
944 file->f_flags |= O_NONBLOCK;
946 /* Write the data. */
947 oldfs = get_fs(); set_fs(KERNEL_DS);
948 err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
951 nfsdstats.io_write += cnt;
952 fsnotify_modify(file->f_dentry);
955 /* clear setuid/setgid flag after write */
956 if (err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID)))
959 if (err >= 0 && stable) {
960 static ino_t last_ino;
961 static dev_t last_dev;
964 * Gathered writes: If another process is currently
965 * writing to the file, there's a high chance
966 * this is another nfsd (triggered by a bulk write
967 * from a client's biod). Rather than syncing the
968 * file with each write request, we sleep for 10 msec.
970 * I don't know if this roughly approximates
971 * C. Juszak's idea of gathered writes, but it's a
972 * nice and simple solution (IMHO), and it seems to
975 if (EX_WGATHER(exp)) {
976 if (atomic_read(&inode->i_writecount) > 1
977 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
978 dprintk("nfsd: write defer %d\n", current->pid);
980 dprintk("nfsd: write resume %d\n", current->pid);
983 if (inode->i_state & I_DIRTY) {
984 dprintk("nfsd: write sync %d\n", current->pid);
988 wake_up(&inode->i_wait);
991 last_ino = inode->i_ino;
992 last_dev = inode->i_sb->s_dev;
995 dprintk("nfsd: write complete err=%d\n", err);
999 /* to get NFSERR_JUKEBOX on the wire, need -ETIMEDOUT */
1002 err = nfserrno(err);
1009 * Read data from a file. count must contain the requested read count
1010 * on entry. On return, *count contains the number of bytes actually read.
1011 * N.B. After this call fhp needs an fh_put
1014 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1015 loff_t offset, struct kvec *vec, int vlen,
1016 unsigned long *count)
1021 err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
1022 MAY_READ|MAY_OWNER_OVERRIDE);
1025 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1027 err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file);
1030 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1038 * Write data to a file.
1039 * The stable flag requests synchronous writes.
1040 * N.B. After this call fhp needs an fh_put
1043 nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1044 loff_t offset, struct kvec *vec, int vlen, unsigned long cnt,
1050 err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
1051 MAY_WRITE|MAY_OWNER_OVERRIDE);
1054 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
1057 err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file);
1062 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
1070 #ifdef CONFIG_NFSD_V3
1072 * Commit all pending writes to stable storage.
1073 * Strictly speaking, we could sync just the indicated file region here,
1074 * but there's currently no way we can ask the VFS to do so.
1076 * Unfortunately we cannot lock the file to make sure we return full WCC
1077 * data to the client, as locking happens lower down in the filesystem.
1080 nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
1081 loff_t offset, unsigned long count)
1086 if ((u64)count > ~(u64)offset)
1087 return nfserr_inval;
1089 if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0)
1091 if (EX_ISSYNC(fhp->fh_export)) {
1092 if (file->f_op && file->f_op->fsync) {
1093 err = nfserrno(nfsd_sync(file));
1095 err = nfserr_notsupp;
1102 #endif /* CONFIG_NFSD_V3 */
1105 * Create a file (regular, directory, device, fifo); UNIX sockets
1106 * not yet implemented.
1107 * If the response fh has been verified, the parent directory should
1108 * already be locked. Note that the parent directory is left locked.
1110 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1113 nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
1114 char *fname, int flen, struct iattr *iap,
1115 int type, dev_t rdev, struct svc_fh *resfhp)
1117 struct dentry *dentry, *dchild = NULL;
1125 if (isdotent(fname, flen))
1128 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1132 dentry = fhp->fh_dentry;
1133 dirp = dentry->d_inode;
1135 err = nfserr_notdir;
1136 if(!dirp->i_op || !dirp->i_op->lookup)
1139 * Check whether the response file handle has been verified yet.
1140 * If it has, the parent directory should already be locked.
1142 if (!resfhp->fh_dentry) {
1143 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1145 dchild = lookup_one_len(fname, dentry, flen);
1146 err = PTR_ERR(dchild);
1149 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1153 /* called from nfsd_proc_create */
1154 dchild = dget(resfhp->fh_dentry);
1155 if (!fhp->fh_locked) {
1156 /* not actually possible */
1158 "nfsd_create: parent %s/%s not locked!\n",
1159 dentry->d_parent->d_name.name,
1160 dentry->d_name.name);
1166 * Make sure the child dentry is still negative ...
1169 if (dchild->d_inode) {
1170 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1171 dentry->d_name.name, dchild->d_name.name);
1175 if (!(iap->ia_valid & ATTR_MODE))
1177 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1180 * Get the dir op function pointer.
1185 err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1188 err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1194 err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1197 printk("nfsd: bad file type %o in nfsd_create\n", type);
1203 if (EX_ISSYNC(fhp->fh_export)) {
1204 err = nfserrno(nfsd_sync_dir(dentry));
1205 write_inode_now(dchild->d_inode, 1);
1209 /* Set file attributes. Mode has already been set and
1210 * setting uid/gid works only for root. Irix appears to
1211 * send along the gid when it tries to implement setgid
1212 * directories via NFS.
1214 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
1215 int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1220 * Update the file handle to get the new inode info.
1223 err = fh_update(resfhp);
1225 if (dchild && !IS_ERR(dchild))
1230 err = nfserrno(err);
1234 #ifdef CONFIG_NFSD_V3
1236 * NFSv3 version of nfsd_create
1239 nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1240 char *fname, int flen, struct iattr *iap,
1241 struct svc_fh *resfhp, int createmode, u32 *verifier,
1244 struct dentry *dentry, *dchild = NULL;
1247 __u32 v_mtime=0, v_atime=0;
1254 if (isdotent(fname, flen))
1256 if (!(iap->ia_valid & ATTR_MODE))
1258 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1262 dentry = fhp->fh_dentry;
1263 dirp = dentry->d_inode;
1265 /* Get all the sanity checks out of the way before
1266 * we lock the parent. */
1267 err = nfserr_notdir;
1268 if(!dirp->i_op || !dirp->i_op->lookup)
1273 * Compose the response file handle.
1275 dchild = lookup_one_len(fname, dentry, flen);
1276 err = PTR_ERR(dchild);
1280 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1284 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1285 /* while the verifier would fit in mtime+atime,
1286 * solaris7 gets confused (bugid 4218508) if these have
1287 * the high bit set, so we use the mode as well
1289 v_mtime = verifier[0]&0x7fffffff;
1290 v_atime = verifier[1]&0x7fffffff;
1292 | ((verifier[0]&0x80000000) >> (32-7)) /* u+x */
1293 | ((verifier[1]&0x80000000) >> (32-9)) /* u+r */
1297 if (dchild->d_inode) {
1300 switch (createmode) {
1301 case NFS3_CREATE_UNCHECKED:
1302 if (! S_ISREG(dchild->d_inode->i_mode))
1305 /* in nfsv4, we need to treat this case a little
1306 * differently. we don't want to truncate the
1307 * file now; this would be wrong if the OPEN
1308 * fails for some other reason. furthermore,
1309 * if the size is nonzero, we should ignore it
1310 * according to spec!
1312 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1315 iap->ia_valid &= ATTR_SIZE;
1319 case NFS3_CREATE_EXCLUSIVE:
1320 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
1321 && dchild->d_inode->i_atime.tv_sec == v_atime
1322 && dchild->d_inode->i_mode == v_mode
1323 && dchild->d_inode->i_size == 0 )
1326 case NFS3_CREATE_GUARDED:
1332 err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1336 if (EX_ISSYNC(fhp->fh_export)) {
1337 err = nfserrno(nfsd_sync_dir(dentry));
1338 /* setattr will sync the child (or not) */
1341 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1342 /* Cram the verifier into atime/mtime/mode */
1343 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1344 | ATTR_MTIME_SET|ATTR_ATIME_SET
1346 /* XXX someone who knows this better please fix it for nsec */
1347 iap->ia_mtime.tv_sec = v_mtime;
1348 iap->ia_atime.tv_sec = v_atime;
1349 iap->ia_mtime.tv_nsec = 0;
1350 iap->ia_atime.tv_nsec = 0;
1351 iap->ia_mode = v_mode;
1354 /* Set file attributes.
1355 * Mode has already been set but we might need to reset it
1356 * for CREATE_EXCLUSIVE
1357 * Irix appears to send along the gid when it tries to
1358 * implement setgid directories via NFS. Clear out all that cruft.
1361 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID)) != 0) {
1362 int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1368 * Update the filehandle to get the new inode info.
1371 err = fh_update(resfhp);
1375 if (dchild && !IS_ERR(dchild))
1380 err = nfserrno(err);
1383 #endif /* CONFIG_NFSD_V3 */
1386 * Read a symlink. On entry, *lenp must contain the maximum path length that
1387 * fits into the buffer. On return, it contains the true length.
1388 * N.B. After this call fhp needs an fh_put
1391 nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1393 struct dentry *dentry;
1394 struct inode *inode;
1398 err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP);
1402 dentry = fhp->fh_dentry;
1403 inode = dentry->d_inode;
1406 if (!inode->i_op || !inode->i_op->readlink)
1409 touch_atime(fhp->fh_export->ex_mnt, dentry);
1410 /* N.B. Why does this call need a get_fs()??
1411 * Remove the set_fs and watch the fireworks:-) --okir
1414 oldfs = get_fs(); set_fs(KERNEL_DS);
1415 err = inode->i_op->readlink(dentry, buf, *lenp);
1426 err = nfserrno(err);
1431 * Create a symlink and look up its inode
1432 * N.B. After this call _both_ fhp and resfhp need an fh_put
1435 nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1436 char *fname, int flen,
1437 char *path, int plen,
1438 struct svc_fh *resfhp,
1441 struct dentry *dentry, *dnew;
1449 if (isdotent(fname, flen))
1452 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1456 dentry = fhp->fh_dentry;
1457 dnew = lookup_one_len(fname, dentry, flen);
1458 err = PTR_ERR(dnew);
1463 /* Only the MODE ATTRibute is even vaguely meaningful */
1464 if (iap && (iap->ia_valid & ATTR_MODE))
1465 mode = iap->ia_mode & S_IALLUGO;
1467 if (unlikely(path[plen] != 0)) {
1468 char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1469 if (path_alloced == NULL)
1472 strncpy(path_alloced, path, plen);
1473 path_alloced[plen] = 0;
1474 err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
1475 kfree(path_alloced);
1478 err = vfs_symlink(dentry->d_inode, dnew, path, mode);
1481 if (EX_ISSYNC(fhp->fh_export))
1482 err = nfsd_sync_dir(dentry);
1484 err = nfserrno(err);
1487 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1489 if (err==0) err = cerr;
1494 err = nfserrno(err);
1500 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1503 nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1504 char *name, int len, struct svc_fh *tfhp)
1506 struct dentry *ddir, *dnew, *dold;
1507 struct inode *dirp, *dest;
1510 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
1513 err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP);
1521 if (isdotent(name, len))
1525 ddir = ffhp->fh_dentry;
1526 dirp = ddir->d_inode;
1528 dnew = lookup_one_len(name, ddir, len);
1529 err = PTR_ERR(dnew);
1533 dold = tfhp->fh_dentry;
1534 dest = dold->d_inode;
1536 err = vfs_link(dold, dirp, dnew);
1538 if (EX_ISSYNC(ffhp->fh_export)) {
1539 err = nfserrno(nfsd_sync_dir(ddir));
1540 write_inode_now(dest, 1);
1543 if (err == -EXDEV && rqstp->rq_vers == 2)
1546 err = nfserrno(err);
1555 err = nfserrno(err);
1561 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1564 nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1565 struct svc_fh *tfhp, char *tname, int tlen)
1567 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap;
1568 struct inode *fdir, *tdir;
1571 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
1574 err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
1578 fdentry = ffhp->fh_dentry;
1579 fdir = fdentry->d_inode;
1581 tdentry = tfhp->fh_dentry;
1582 tdir = tdentry->d_inode;
1584 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1585 if (fdir->i_sb != tdir->i_sb)
1589 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1592 /* cannot use fh_lock as we need deadlock protective ordering
1593 * so do it by hand */
1594 trap = lock_rename(tdentry, fdentry);
1595 ffhp->fh_locked = tfhp->fh_locked = 1;
1599 odentry = lookup_one_len(fname, fdentry, flen);
1600 err = PTR_ERR(odentry);
1601 if (IS_ERR(odentry))
1605 if (!odentry->d_inode)
1608 if (odentry == trap)
1611 ndentry = lookup_one_len(tname, tdentry, tlen);
1612 err = PTR_ERR(ndentry);
1613 if (IS_ERR(ndentry))
1616 if (ndentry == trap)
1620 if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1621 ((atomic_read(&odentry->d_count) > 1)
1622 || (atomic_read(&ndentry->d_count) > 1))) {
1626 err = vfs_rename(fdir, odentry, tdir, ndentry);
1627 if (!err && EX_ISSYNC(tfhp->fh_export)) {
1628 err = nfsd_sync_dir(tdentry);
1630 err = nfsd_sync_dir(fdentry);
1639 err = nfserrno(err);
1641 /* we cannot reply on fh_unlock on the two filehandles,
1642 * as that would do the wrong thing if the two directories
1643 * were the same, so again we do it by hand
1645 fill_post_wcc(ffhp);
1646 fill_post_wcc(tfhp);
1647 unlock_rename(tdentry, fdentry);
1648 ffhp->fh_locked = tfhp->fh_locked = 0;
1655 * Unlink a file or directory
1656 * N.B. After this call fhp needs an fh_put
1659 nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1660 char *fname, int flen)
1662 struct dentry *dentry, *rdentry;
1667 if (!flen || isdotent(fname, flen))
1669 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
1674 dentry = fhp->fh_dentry;
1675 dirp = dentry->d_inode;
1677 rdentry = lookup_one_len(fname, dentry, flen);
1678 err = PTR_ERR(rdentry);
1679 if (IS_ERR(rdentry))
1682 if (!rdentry->d_inode) {
1689 type = rdentry->d_inode->i_mode & S_IFMT;
1691 if (type != S_IFDIR) { /* It's UNLINK */
1693 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1694 (atomic_read(&rdentry->d_count) > 1)) {
1698 err = vfs_unlink(dirp, rdentry);
1699 } else { /* It's RMDIR */
1700 err = vfs_rmdir(dirp, rdentry);
1706 EX_ISSYNC(fhp->fh_export))
1707 err = nfsd_sync_dir(dentry);
1710 err = nfserrno(err);
1716 * Read entries from a directory.
1717 * The NFSv3/4 verifier we ignore for now.
1720 nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
1721 struct readdir_cd *cdp, encode_dent_fn func)
1725 loff_t offset = *offsetp;
1727 err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file);
1731 offset = vfs_llseek(file, offset, 0);
1733 err = nfserrno((int)offset);
1738 * Read the directory entries. This silly loop is necessary because
1739 * readdir() is not guaranteed to fill up the entire buffer, but
1740 * may choose to do less.
1744 cdp->err = nfserr_eof; /* will be cleared on successful read */
1745 err = vfs_readdir(file, (filldir_t) func, cdp);
1746 } while (err >=0 && cdp->err == nfs_ok);
1748 err = nfserrno(err);
1751 *offsetp = vfs_llseek(file, 0, 1);
1753 if (err == nfserr_eof || err == nfserr_toosmall)
1754 err = nfs_ok; /* can still be found in ->err */
1762 * Get file system stats
1763 * N.B. After this call fhp needs an fh_put
1766 nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat)
1768 int err = fh_verify(rqstp, fhp, 0, MAY_NOP);
1769 if (!err && vfs_statfs(fhp->fh_dentry->d_inode->i_sb,stat))
1775 * Check for a user's access permissions to this inode.
1778 nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc)
1780 struct inode *inode = dentry->d_inode;
1786 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
1788 (acc & MAY_READ)? " read" : "",
1789 (acc & MAY_WRITE)? " write" : "",
1790 (acc & MAY_EXEC)? " exec" : "",
1791 (acc & MAY_SATTR)? " sattr" : "",
1792 (acc & MAY_TRUNC)? " trunc" : "",
1793 (acc & MAY_LOCK)? " lock" : "",
1794 (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "",
1796 IS_IMMUTABLE(inode)? " immut" : "",
1797 IS_APPEND(inode)? " append" : "",
1798 IS_RDONLY(inode)? " ro" : "");
1799 dprintk(" owner %d/%d user %d/%d\n",
1800 inode->i_uid, inode->i_gid, current->fsuid, current->fsgid);
1803 /* Normally we reject any write/sattr etc access on a read-only file
1804 * system. But if it is IRIX doing check on write-access for a
1805 * device special file, we ignore rofs.
1807 if (!(acc & MAY_LOCAL_ACCESS))
1808 if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) {
1809 if (EX_RDONLY(exp) || IS_RDONLY(inode))
1811 if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode))
1814 if ((acc & MAY_TRUNC) && IS_APPEND(inode))
1817 if (acc & MAY_LOCK) {
1818 /* If we cannot rely on authentication in NLM requests,
1819 * just allow locks, otherwise require read permission, or
1822 if (exp->ex_flags & NFSEXP_NOAUTHNLM)
1825 acc = MAY_READ | MAY_OWNER_OVERRIDE;
1828 * The file owner always gets access permission for accesses that
1829 * would normally be checked at open time. This is to make
1830 * file access work even when the client has done a fchmod(fd, 0).
1832 * However, `cp foo bar' should fail nevertheless when bar is
1833 * readonly. A sensible way to do this might be to reject all
1834 * attempts to truncate a read-only file, because a creat() call
1835 * always implies file truncation.
1836 * ... but this isn't really fair. A process may reasonably call
1837 * ftruncate on an open file descriptor on a file with perm 000.
1838 * We must trust the client to do permission checking - using "ACCESS"
1841 if ((acc & MAY_OWNER_OVERRIDE) &&
1842 inode->i_uid == current->fsuid)
1845 err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL);
1847 /* Allow read access to binaries even when mode 111 */
1848 if (err == -EACCES && S_ISREG(inode->i_mode) &&
1849 acc == (MAY_READ | MAY_OWNER_OVERRIDE))
1850 err = permission(inode, MAY_EXEC, NULL);
1852 return err? nfserrno(err) : 0;
1856 nfsd_racache_shutdown(void)
1860 dprintk("nfsd: freeing readahead buffers.\n");
1862 raparm_cache = raparml = NULL;
1865 * Initialize readahead param cache
1868 nfsd_racache_init(int cache_size)
1874 raparml = kmalloc(sizeof(struct raparms) * cache_size, GFP_KERNEL);
1876 if (raparml != NULL) {
1877 dprintk("nfsd: allocating %d readahead buffers.\n",
1879 memset(raparml, 0, sizeof(struct raparms) * cache_size);
1880 for (i = 0; i < cache_size - 1; i++) {
1881 raparml[i].p_next = raparml + i + 1;
1883 raparm_cache = raparml;
1886 "nfsd: Could not allocate memory read-ahead cache.\n");
1889 nfsdstats.ra_size = cache_size;
1893 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
1895 nfsd_get_posix_acl(struct svc_fh *fhp, int type)
1897 struct inode *inode = fhp->fh_dentry->d_inode;
1901 struct posix_acl *acl;
1903 if (!IS_POSIXACL(inode))
1904 return ERR_PTR(-EOPNOTSUPP);
1907 case ACL_TYPE_ACCESS:
1908 name = POSIX_ACL_XATTR_ACCESS;
1910 case ACL_TYPE_DEFAULT:
1911 name = POSIX_ACL_XATTR_DEFAULT;
1914 return ERR_PTR(-EOPNOTSUPP);
1917 size = nfsd_getxattr(fhp->fh_dentry, name, &value);
1919 return ERR_PTR(size);
1921 acl = posix_acl_from_xattr(value, size);
1927 nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
1929 struct inode *inode = fhp->fh_dentry->d_inode;
1935 if (!IS_POSIXACL(inode) || !inode->i_op ||
1936 !inode->i_op->setxattr || !inode->i_op->removexattr)
1939 case ACL_TYPE_ACCESS:
1940 name = POSIX_ACL_XATTR_ACCESS;
1942 case ACL_TYPE_DEFAULT:
1943 name = POSIX_ACL_XATTR_DEFAULT;
1949 if (acl && acl->a_count) {
1950 size = posix_acl_xattr_size(acl->a_count);
1951 value = kmalloc(size, GFP_KERNEL);
1954 error = posix_acl_to_xattr(acl, value, size);
1962 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
1964 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
1967 error = vfs_removexattr(fhp->fh_dentry, name);
1968 if (error == -ENODATA)
1977 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */