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/string.h>
20 #include <linux/time.h>
21 #include <linux/errno.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>
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>
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>
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>
59 #include <asm/uaccess.h>
61 #define NFSDDBG_FACILITY NFSDDBG_FILEOP
64 /* We must ignore files (but only files) which might have mandatory
65 * locks on them because there is no way to know if the accesser has
68 #define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i))
71 * This is a cache of readahead params that help us choose the proper
72 * readahead strategy. Initially, we set all readahead parameters to 0
73 * and let the VFS handle things.
74 * If you increase the number of cached files very much, you'll need to
75 * add a hash table here.
78 struct raparms *p_next;
83 struct file_ra_state p_ra;
84 unsigned int p_hindex;
87 struct raparm_hbucket {
88 struct raparms *pb_head;
90 } ____cacheline_aligned_in_smp;
92 static struct raparms * raparml;
93 #define RAPARM_HASH_BITS 4
94 #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS)
95 #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1)
96 static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE];
99 * Called from nfsd_lookup and encode_dirent. Check if we have crossed
101 * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged,
102 * or nfs_ok having possibly changed *dpp and *expp
105 nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
106 struct svc_export **expp)
108 struct svc_export *exp = *expp, *exp2 = NULL;
109 struct dentry *dentry = *dpp;
110 struct vfsmount *mnt = mntget(exp->ex_mnt);
111 struct dentry *mounts = dget(dentry);
114 while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts));
116 exp2 = rqst_exp_get_by_name(rqstp, mnt, mounts);
123 if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) {
124 /* successfully crossed mount point */
130 if (exp2) exp_put(exp2);
139 nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
140 const char *name, int len,
141 struct svc_export **exp_ret, struct dentry **dentry_ret)
143 struct svc_export *exp;
144 struct dentry *dparent;
145 struct dentry *dentry;
149 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
151 /* Obtain dentry and export. */
152 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
156 dparent = fhp->fh_dentry;
157 exp = fhp->fh_export;
160 /* Lookup the name, but don't follow links */
161 if (isdotent(name, len)) {
163 dentry = dget(dparent);
164 else if (dparent != exp->ex_dentry) {
165 dentry = dget_parent(dparent);
166 } else if (!EX_NOHIDE(exp))
167 dentry = dget(dparent); /* .. == . just like at / */
169 /* checking mountpoint crossing is very different when stepping up */
170 struct svc_export *exp2 = NULL;
172 struct vfsmount *mnt = mntget(exp->ex_mnt);
173 dentry = dget(dparent);
174 while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry))
176 dp = dget_parent(dentry);
180 exp2 = rqst_exp_parent(rqstp, mnt, dentry);
181 if (PTR_ERR(exp2) == -ENOENT) {
183 dentry = dget(dparent);
184 } else if (IS_ERR(exp2)) {
185 host_err = PTR_ERR(exp2);
197 dentry = lookup_one_len(name, dparent, len);
198 host_err = PTR_ERR(dentry);
202 * check if we have crossed a mount point ...
204 if (d_mountpoint(dentry)) {
205 if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
211 *dentry_ret = dentry;
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>
233 nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
234 int len, struct svc_fh *resfh)
236 struct svc_export *exp;
237 struct dentry *dentry;
240 err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry);
244 * Note: we compose the file handle now, but as the
245 * dentry may be negative, it may need to be updated.
247 err = fh_compose(resfh, exp, dentry, fhp);
248 if (!err && !dentry->d_inode)
257 * Set various file attributes.
258 * N.B. After this call fhp needs an fh_put
261 nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
262 int check_guard, time_t guardtime)
264 struct dentry *dentry;
266 int accmode = MAY_SATTR;
273 if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
274 accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE;
275 if (iap->ia_valid & ATTR_SIZE)
279 err = fh_verify(rqstp, fhp, ftype, accmode);
283 dentry = fhp->fh_dentry;
284 inode = dentry->d_inode;
286 /* Ignore any mode updates on symlinks */
287 if (S_ISLNK(inode->i_mode))
288 iap->ia_valid &= ~ATTR_MODE;
293 /* NFSv2 does not differentiate between "set-[ac]time-to-now"
294 * which only requires access, and "set-[ac]time-to-X" which
295 * requires ownership.
296 * So if it looks like it might be "set both to the same time which
297 * is close to now", and if inode_change_ok fails, then we
298 * convert to "set to now" instead of "set to explicit time"
300 * We only call inode_change_ok as the last test as technically
301 * it is not an interface that we should be using. It is only
302 * valid if the filesystem does not define it's own i_op->setattr.
304 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
305 #define MAX_TOUCH_TIME_ERROR (30*60)
306 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET
307 && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec
309 /* Looks probable. Now just make sure time is in the right ballpark.
310 * Solaris, at least, doesn't seem to care what the time request is.
311 * We require it be within 30 minutes of now.
313 time_t delta = iap->ia_atime.tv_sec - get_seconds();
314 if (delta<0) delta = -delta;
315 if (delta < MAX_TOUCH_TIME_ERROR &&
316 inode_change_ok(inode, iap) != 0) {
317 /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
318 * this will cause notify_change to set these times to "now"
320 iap->ia_valid &= ~BOTH_TIME_SET;
324 /* The size case is special. It changes the file as well as the attributes. */
325 if (iap->ia_valid & ATTR_SIZE) {
326 if (iap->ia_size < inode->i_size) {
327 err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
333 * If we are changing the size of the file, then
334 * we need to break all leases.
336 host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
337 if (host_err == -EWOULDBLOCK)
338 host_err = -ETIMEDOUT;
339 if (host_err) /* ENOMEM or EWOULDBLOCK */
342 host_err = get_write_access(inode);
347 host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
349 put_write_access(inode);
355 imode = inode->i_mode;
356 if (iap->ia_valid & ATTR_MODE) {
357 iap->ia_mode &= S_IALLUGO;
358 imode = iap->ia_mode |= (imode & ~S_IALLUGO);
361 /* Revoke setuid/setgid bit on chown/chgrp */
362 if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid)
363 iap->ia_valid |= ATTR_KILL_SUID;
364 if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)
365 iap->ia_valid |= ATTR_KILL_SGID;
367 /* Change the attributes. */
369 iap->ia_valid |= ATTR_CTIME;
371 err = nfserr_notsync;
372 if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
374 host_err = notify_change(dentry, iap);
375 err = nfserrno(host_err);
379 put_write_access(inode);
381 if (EX_ISSYNC(fhp->fh_export))
382 write_inode_now(inode, 1);
387 err = nfserrno(host_err);
391 #if defined(CONFIG_NFSD_V2_ACL) || \
392 defined(CONFIG_NFSD_V3_ACL) || \
393 defined(CONFIG_NFSD_V4)
394 static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
398 buflen = vfs_getxattr(dentry, key, NULL, 0);
402 *buf = kmalloc(buflen, GFP_KERNEL);
406 return vfs_getxattr(dentry, key, *buf, buflen);
410 #if defined(CONFIG_NFSD_V4)
412 set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
419 buflen = posix_acl_xattr_size(pacl->a_count);
420 buf = kmalloc(buflen, GFP_KERNEL);
425 len = posix_acl_to_xattr(pacl, buf, buflen);
431 error = vfs_setxattr(dentry, key, buf, len, 0);
438 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
439 struct nfs4_acl *acl)
443 struct dentry *dentry;
445 struct posix_acl *pacl = NULL, *dpacl = NULL;
446 unsigned int flags = 0;
449 error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR);
453 dentry = fhp->fh_dentry;
454 inode = dentry->d_inode;
455 if (S_ISDIR(inode->i_mode))
456 flags = NFS4_ACL_DIR;
458 host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
459 if (host_error == -EINVAL) {
460 return nfserr_attrnotsupp;
461 } else if (host_error < 0)
464 host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
468 if (S_ISDIR(inode->i_mode))
469 host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
472 posix_acl_release(pacl);
473 posix_acl_release(dpacl);
475 if (host_error == -EOPNOTSUPP)
476 return nfserr_attrnotsupp;
478 return nfserrno(host_error);
481 static struct posix_acl *
482 _get_posix_acl(struct dentry *dentry, char *key)
485 struct posix_acl *pacl = NULL;
488 buflen = nfsd_getxattr(dentry, key, &buf);
492 return ERR_PTR(buflen);
494 pacl = posix_acl_from_xattr(buf, buflen);
500 nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
502 struct inode *inode = dentry->d_inode;
504 struct posix_acl *pacl = NULL, *dpacl = NULL;
505 unsigned int flags = 0;
507 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
508 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
509 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
511 error = PTR_ERR(pacl);
516 if (S_ISDIR(inode->i_mode)) {
517 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
518 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
520 else if (IS_ERR(dpacl)) {
521 error = PTR_ERR(dpacl);
525 flags = NFS4_ACL_DIR;
528 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
530 error = PTR_ERR(*acl);
534 posix_acl_release(pacl);
535 posix_acl_release(dpacl);
539 #endif /* defined(CONFIG_NFS_V4) */
541 #ifdef CONFIG_NFSD_V3
543 * Check server access rights to a file system object
549 static struct accessmap nfs3_regaccess[] = {
550 { NFS3_ACCESS_READ, MAY_READ },
551 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
552 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC },
553 { NFS3_ACCESS_EXTEND, MAY_WRITE },
558 static struct accessmap nfs3_diraccess[] = {
559 { NFS3_ACCESS_READ, MAY_READ },
560 { NFS3_ACCESS_LOOKUP, MAY_EXEC },
561 { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC },
562 { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE },
563 { NFS3_ACCESS_DELETE, MAY_REMOVE },
568 static struct accessmap nfs3_anyaccess[] = {
569 /* Some clients - Solaris 2.6 at least, make an access call
570 * to the server to check for access for things like /dev/null
571 * (which really, the server doesn't care about). So
572 * We provide simple access checking for them, looking
573 * mainly at mode bits, and we make sure to ignore read-only
576 { NFS3_ACCESS_READ, MAY_READ },
577 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
578 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS },
579 { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS },
585 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
587 struct accessmap *map;
588 struct svc_export *export;
589 struct dentry *dentry;
590 u32 query, result = 0, sresult = 0;
593 error = fh_verify(rqstp, fhp, 0, MAY_NOP);
597 export = fhp->fh_export;
598 dentry = fhp->fh_dentry;
600 if (S_ISREG(dentry->d_inode->i_mode))
601 map = nfs3_regaccess;
602 else if (S_ISDIR(dentry->d_inode->i_mode))
603 map = nfs3_diraccess;
605 map = nfs3_anyaccess;
609 for (; map->access; map++) {
610 if (map->access & query) {
613 sresult |= map->access;
615 err2 = nfsd_permission(export, dentry, map->how);
618 result |= map->access;
621 /* the following error codes just mean the access was not allowed,
622 * rather than an error occurred */
626 /* simply don't "or" in the access bit. */
636 *supported = sresult;
641 #endif /* CONFIG_NFSD_V3 */
646 * Open an existing file or directory.
647 * The access argument indicates the type of open (read/write/lock)
648 * N.B. After this call fhp needs an fh_put
651 nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
652 int access, struct file **filp)
654 struct dentry *dentry;
656 int flags = O_RDONLY|O_LARGEFILE;
661 * If we get here, then the client has already done an "open",
662 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
663 * in case a chmod has now revoked permission.
665 err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE);
669 dentry = fhp->fh_dentry;
670 inode = dentry->d_inode;
672 /* Disallow write access to files with the append-only bit set
673 * or any access when mandatory locking enabled
676 if (IS_APPEND(inode) && (access & MAY_WRITE))
678 if (IS_ISMNDLK(inode))
685 * Check to see if there are any leases on this file.
686 * This may block while leases are broken.
688 host_err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0));
689 if (host_err == -EWOULDBLOCK)
690 host_err = -ETIMEDOUT;
691 if (host_err) /* NOMEM or WOULDBLOCK */
694 if (access & MAY_WRITE) {
695 if (access & MAY_READ)
696 flags = O_RDWR|O_LARGEFILE;
698 flags = O_WRONLY|O_LARGEFILE;
702 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags);
704 host_err = PTR_ERR(*filp);
706 err = nfserrno(host_err);
715 nfsd_close(struct file *filp)
722 * As this calls fsync (not fdatasync) there is no need for a write_inode
725 static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
726 const struct file_operations *fop)
728 struct inode *inode = dp->d_inode;
729 int (*fsync) (struct file *, struct dentry *, int);
732 err = filemap_fdatawrite(inode->i_mapping);
733 if (err == 0 && fop && (fsync = fop->fsync))
734 err = fsync(filp, dp, 0);
736 err = filemap_fdatawait(inode->i_mapping);
743 nfsd_sync(struct file *filp)
746 struct inode *inode = filp->f_path.dentry->d_inode;
747 dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name);
748 mutex_lock(&inode->i_mutex);
749 err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op);
750 mutex_unlock(&inode->i_mutex);
756 nfsd_sync_dir(struct dentry *dp)
758 return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
762 * Obtain the readahead parameters for the file
763 * specified by (dev, ino).
766 static inline struct raparms *
767 nfsd_get_raparms(dev_t dev, ino_t ino)
769 struct raparms *ra, **rap, **frap = NULL;
772 struct raparm_hbucket *rab;
774 hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK;
775 rab = &raparm_hash[hash];
777 spin_lock(&rab->pb_lock);
778 for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) {
779 if (ra->p_ino == ino && ra->p_dev == dev)
782 if (ra->p_count == 0)
785 depth = nfsdstats.ra_size*11/10;
787 spin_unlock(&rab->pb_lock);
797 if (rap != &rab->pb_head) {
799 ra->p_next = rab->pb_head;
803 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
804 spin_unlock(&rab->pb_lock);
809 * Grab and keep cached pages associated with a file in the svc_rqst
810 * so that they can be passed to the network sendmsg/sendpage routines
811 * directly. They will be released after the sending has completed.
814 nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
815 struct splice_desc *sd)
817 struct svc_rqst *rqstp = sd->u.data;
818 struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
819 struct page *page = buf->page;
823 ret = buf->ops->confirm(pipe, buf);
829 if (rqstp->rq_res.page_len == 0) {
834 rqstp->rq_res.page_base = buf->offset;
835 rqstp->rq_res.page_len = size;
836 } else if (page != pp[-1]) {
842 rqstp->rq_res.page_len += size;
844 rqstp->rq_res.page_len += size;
849 static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
850 struct splice_desc *sd)
852 return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
856 nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
857 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
866 inode = file->f_path.dentry->d_inode;
868 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
869 (!lock_may_read(inode, offset, *count)))
873 /* Get readahead parameters */
874 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
877 file->f_ra = ra->p_ra;
879 if (file->f_op->splice_read && rqstp->rq_splice_ok) {
880 struct splice_desc sd = {
887 rqstp->rq_resused = 1;
888 host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
892 host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
896 /* Write back readahead params */
898 struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
899 spin_lock(&rab->pb_lock);
900 ra->p_ra = file->f_ra;
903 spin_unlock(&rab->pb_lock);
907 nfsdstats.io_read += host_err;
910 fsnotify_access(file->f_path.dentry);
912 err = nfserrno(host_err);
917 static void kill_suid(struct dentry *dentry)
920 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;
922 mutex_lock(&dentry->d_inode->i_mutex);
923 notify_change(dentry, &ia);
924 mutex_unlock(&dentry->d_inode->i_mutex);
928 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
929 loff_t offset, struct kvec *vec, int vlen,
930 unsigned long cnt, int *stablep)
932 struct svc_export *exp;
933 struct dentry *dentry;
938 int stable = *stablep;
943 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
944 (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt)))
948 dentry = file->f_path.dentry;
949 inode = dentry->d_inode;
950 exp = fhp->fh_export;
953 * Request sync writes if
954 * - the sync export option has been set, or
955 * - the client requested O_SYNC behavior (NFSv3 feature).
956 * - The file system doesn't support fsync().
957 * When gathered writes have been configured for this volume,
958 * flushing the data to disk is handled separately below.
961 if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */
963 *stablep = 2; /* FILE_SYNC */
968 if (stable && !EX_WGATHER(exp))
969 file->f_flags |= O_SYNC;
971 /* Write the data. */
972 oldfs = get_fs(); set_fs(KERNEL_DS);
973 host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
976 nfsdstats.io_write += cnt;
977 fsnotify_modify(file->f_path.dentry);
980 /* clear setuid/setgid flag after write */
981 if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID)))
984 if (host_err >= 0 && stable) {
985 static ino_t last_ino;
986 static dev_t last_dev;
989 * Gathered writes: If another process is currently
990 * writing to the file, there's a high chance
991 * this is another nfsd (triggered by a bulk write
992 * from a client's biod). Rather than syncing the
993 * file with each write request, we sleep for 10 msec.
995 * I don't know if this roughly approximates
996 * C. Juszak's idea of gathered writes, but it's a
997 * nice and simple solution (IMHO), and it seems to
1000 if (EX_WGATHER(exp)) {
1001 if (atomic_read(&inode->i_writecount) > 1
1002 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
1003 dprintk("nfsd: write defer %d\n", current->pid);
1005 dprintk("nfsd: write resume %d\n", current->pid);
1008 if (inode->i_state & I_DIRTY) {
1009 dprintk("nfsd: write sync %d\n", current->pid);
1010 host_err=nfsd_sync(file);
1013 wake_up(&inode->i_wait);
1016 last_ino = inode->i_ino;
1017 last_dev = inode->i_sb->s_dev;
1020 dprintk("nfsd: write complete host_err=%d\n", host_err);
1024 err = nfserrno(host_err);
1030 * Read data from a file. count must contain the requested read count
1031 * on entry. On return, *count contains the number of bytes actually read.
1032 * N.B. After this call fhp needs an fh_put
1035 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1036 loff_t offset, struct kvec *vec, int vlen,
1037 unsigned long *count)
1042 err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
1043 MAY_READ|MAY_OWNER_OVERRIDE);
1046 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1048 err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file);
1051 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1059 * Write data to a file.
1060 * The stable flag requests synchronous writes.
1061 * N.B. After this call fhp needs an fh_put
1064 nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1065 loff_t offset, struct kvec *vec, int vlen, unsigned long cnt,
1071 err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
1072 MAY_WRITE|MAY_OWNER_OVERRIDE);
1075 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
1078 err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file);
1083 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
1091 #ifdef CONFIG_NFSD_V3
1093 * Commit all pending writes to stable storage.
1094 * Strictly speaking, we could sync just the indicated file region here,
1095 * but there's currently no way we can ask the VFS to do so.
1097 * Unfortunately we cannot lock the file to make sure we return full WCC
1098 * data to the client, as locking happens lower down in the filesystem.
1101 nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
1102 loff_t offset, unsigned long count)
1107 if ((u64)count > ~(u64)offset)
1108 return nfserr_inval;
1110 if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0)
1112 if (EX_ISSYNC(fhp->fh_export)) {
1113 if (file->f_op && file->f_op->fsync) {
1114 err = nfserrno(nfsd_sync(file));
1116 err = nfserr_notsupp;
1123 #endif /* CONFIG_NFSD_V3 */
1126 * Create a file (regular, directory, device, fifo); UNIX sockets
1127 * not yet implemented.
1128 * If the response fh has been verified, the parent directory should
1129 * already be locked. Note that the parent directory is left locked.
1131 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1134 nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
1135 char *fname, int flen, struct iattr *iap,
1136 int type, dev_t rdev, struct svc_fh *resfhp)
1138 struct dentry *dentry, *dchild = NULL;
1147 if (isdotent(fname, flen))
1150 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1154 dentry = fhp->fh_dentry;
1155 dirp = dentry->d_inode;
1157 err = nfserr_notdir;
1158 if(!dirp->i_op || !dirp->i_op->lookup)
1161 * Check whether the response file handle has been verified yet.
1162 * If it has, the parent directory should already be locked.
1164 if (!resfhp->fh_dentry) {
1165 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1166 fh_lock_nested(fhp, I_MUTEX_PARENT);
1167 dchild = lookup_one_len(fname, dentry, flen);
1168 host_err = PTR_ERR(dchild);
1171 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1175 /* called from nfsd_proc_create */
1176 dchild = dget(resfhp->fh_dentry);
1177 if (!fhp->fh_locked) {
1178 /* not actually possible */
1180 "nfsd_create: parent %s/%s not locked!\n",
1181 dentry->d_parent->d_name.name,
1182 dentry->d_name.name);
1188 * Make sure the child dentry is still negative ...
1191 if (dchild->d_inode) {
1192 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1193 dentry->d_name.name, dchild->d_name.name);
1197 if (!(iap->ia_valid & ATTR_MODE))
1199 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1202 * Get the dir op function pointer.
1207 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1210 host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1216 host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1219 printk("nfsd: bad file type %o in nfsd_create\n", type);
1225 if (EX_ISSYNC(fhp->fh_export)) {
1226 err = nfserrno(nfsd_sync_dir(dentry));
1227 write_inode_now(dchild->d_inode, 1);
1231 /* Set file attributes. Mode has already been set and
1232 * setting uid/gid works only for root. Irix appears to
1233 * send along the gid when it tries to implement setgid
1234 * directories via NFS.
1236 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
1237 __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1242 * Update the file handle to get the new inode info.
1245 err = fh_update(resfhp);
1247 if (dchild && !IS_ERR(dchild))
1252 err = nfserrno(host_err);
1256 #ifdef CONFIG_NFSD_V3
1258 * NFSv3 version of nfsd_create
1261 nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1262 char *fname, int flen, struct iattr *iap,
1263 struct svc_fh *resfhp, int createmode, u32 *verifier,
1264 int *truncp, int *created)
1266 struct dentry *dentry, *dchild = NULL;
1270 __u32 v_mtime=0, v_atime=0;
1276 if (isdotent(fname, flen))
1278 if (!(iap->ia_valid & ATTR_MODE))
1280 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1284 dentry = fhp->fh_dentry;
1285 dirp = dentry->d_inode;
1287 /* Get all the sanity checks out of the way before
1288 * we lock the parent. */
1289 err = nfserr_notdir;
1290 if(!dirp->i_op || !dirp->i_op->lookup)
1292 fh_lock_nested(fhp, I_MUTEX_PARENT);
1295 * Compose the response file handle.
1297 dchild = lookup_one_len(fname, dentry, flen);
1298 host_err = PTR_ERR(dchild);
1302 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1306 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1307 /* solaris7 gets confused (bugid 4218508) if these have
1308 * the high bit set, so just clear the high bits.
1310 v_mtime = verifier[0]&0x7fffffff;
1311 v_atime = verifier[1]&0x7fffffff;
1314 if (dchild->d_inode) {
1317 switch (createmode) {
1318 case NFS3_CREATE_UNCHECKED:
1319 if (! S_ISREG(dchild->d_inode->i_mode))
1322 /* in nfsv4, we need to treat this case a little
1323 * differently. we don't want to truncate the
1324 * file now; this would be wrong if the OPEN
1325 * fails for some other reason. furthermore,
1326 * if the size is nonzero, we should ignore it
1327 * according to spec!
1329 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1332 iap->ia_valid &= ATTR_SIZE;
1336 case NFS3_CREATE_EXCLUSIVE:
1337 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
1338 && dchild->d_inode->i_atime.tv_sec == v_atime
1339 && dchild->d_inode->i_size == 0 )
1342 case NFS3_CREATE_GUARDED:
1348 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1354 if (EX_ISSYNC(fhp->fh_export)) {
1355 err = nfserrno(nfsd_sync_dir(dentry));
1356 /* setattr will sync the child (or not) */
1359 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1360 /* Cram the verifier into atime/mtime */
1361 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1362 | ATTR_MTIME_SET|ATTR_ATIME_SET;
1363 /* XXX someone who knows this better please fix it for nsec */
1364 iap->ia_mtime.tv_sec = v_mtime;
1365 iap->ia_atime.tv_sec = v_atime;
1366 iap->ia_mtime.tv_nsec = 0;
1367 iap->ia_atime.tv_nsec = 0;
1370 /* Set file attributes.
1371 * Irix appears to send along the gid when it tries to
1372 * implement setgid directories via NFS. Clear out all that cruft.
1375 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
1376 __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1382 * Update the filehandle to get the new inode info.
1385 err = fh_update(resfhp);
1389 if (dchild && !IS_ERR(dchild))
1394 err = nfserrno(host_err);
1397 #endif /* CONFIG_NFSD_V3 */
1400 * Read a symlink. On entry, *lenp must contain the maximum path length that
1401 * fits into the buffer. On return, it contains the true length.
1402 * N.B. After this call fhp needs an fh_put
1405 nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1407 struct dentry *dentry;
1408 struct inode *inode;
1413 err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP);
1417 dentry = fhp->fh_dentry;
1418 inode = dentry->d_inode;
1421 if (!inode->i_op || !inode->i_op->readlink)
1424 touch_atime(fhp->fh_export->ex_mnt, dentry);
1425 /* N.B. Why does this call need a get_fs()??
1426 * Remove the set_fs and watch the fireworks:-) --okir
1429 oldfs = get_fs(); set_fs(KERNEL_DS);
1430 host_err = inode->i_op->readlink(dentry, buf, *lenp);
1441 err = nfserrno(host_err);
1446 * Create a symlink and look up its inode
1447 * N.B. After this call _both_ fhp and resfhp need an fh_put
1450 nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1451 char *fname, int flen,
1452 char *path, int plen,
1453 struct svc_fh *resfhp,
1456 struct dentry *dentry, *dnew;
1465 if (isdotent(fname, flen))
1468 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1472 dentry = fhp->fh_dentry;
1473 dnew = lookup_one_len(fname, dentry, flen);
1474 host_err = PTR_ERR(dnew);
1479 /* Only the MODE ATTRibute is even vaguely meaningful */
1480 if (iap && (iap->ia_valid & ATTR_MODE))
1481 mode = iap->ia_mode & S_IALLUGO;
1483 if (unlikely(path[plen] != 0)) {
1484 char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1485 if (path_alloced == NULL)
1488 strncpy(path_alloced, path, plen);
1489 path_alloced[plen] = 0;
1490 host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
1491 kfree(path_alloced);
1494 host_err = vfs_symlink(dentry->d_inode, dnew, path, mode);
1497 if (EX_ISSYNC(fhp->fh_export))
1498 host_err = nfsd_sync_dir(dentry);
1500 err = nfserrno(host_err);
1503 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1505 if (err==0) err = cerr;
1510 err = nfserrno(host_err);
1516 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1519 nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1520 char *name, int len, struct svc_fh *tfhp)
1522 struct dentry *ddir, *dnew, *dold;
1523 struct inode *dirp, *dest;
1527 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
1530 err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP);
1538 if (isdotent(name, len))
1541 fh_lock_nested(ffhp, I_MUTEX_PARENT);
1542 ddir = ffhp->fh_dentry;
1543 dirp = ddir->d_inode;
1545 dnew = lookup_one_len(name, ddir, len);
1546 host_err = PTR_ERR(dnew);
1550 dold = tfhp->fh_dentry;
1551 dest = dold->d_inode;
1553 host_err = vfs_link(dold, dirp, dnew);
1555 if (EX_ISSYNC(ffhp->fh_export)) {
1556 err = nfserrno(nfsd_sync_dir(ddir));
1557 write_inode_now(dest, 1);
1561 if (host_err == -EXDEV && rqstp->rq_vers == 2)
1564 err = nfserrno(host_err);
1574 err = nfserrno(host_err);
1580 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1583 nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1584 struct svc_fh *tfhp, char *tname, int tlen)
1586 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap;
1587 struct inode *fdir, *tdir;
1591 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
1594 err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
1598 fdentry = ffhp->fh_dentry;
1599 fdir = fdentry->d_inode;
1601 tdentry = tfhp->fh_dentry;
1602 tdir = tdentry->d_inode;
1604 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1605 if (ffhp->fh_export != tfhp->fh_export)
1609 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1612 /* cannot use fh_lock as we need deadlock protective ordering
1613 * so do it by hand */
1614 trap = lock_rename(tdentry, fdentry);
1615 ffhp->fh_locked = tfhp->fh_locked = 1;
1619 odentry = lookup_one_len(fname, fdentry, flen);
1620 host_err = PTR_ERR(odentry);
1621 if (IS_ERR(odentry))
1625 if (!odentry->d_inode)
1628 if (odentry == trap)
1631 ndentry = lookup_one_len(tname, tdentry, tlen);
1632 host_err = PTR_ERR(ndentry);
1633 if (IS_ERR(ndentry))
1635 host_err = -ENOTEMPTY;
1636 if (ndentry == trap)
1640 if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1641 ((atomic_read(&odentry->d_count) > 1)
1642 || (atomic_read(&ndentry->d_count) > 1))) {
1646 host_err = vfs_rename(fdir, odentry, tdir, ndentry);
1647 if (!host_err && EX_ISSYNC(tfhp->fh_export)) {
1648 host_err = nfsd_sync_dir(tdentry);
1650 host_err = nfsd_sync_dir(fdentry);
1658 err = nfserrno(host_err);
1660 /* we cannot reply on fh_unlock on the two filehandles,
1661 * as that would do the wrong thing if the two directories
1662 * were the same, so again we do it by hand
1664 fill_post_wcc(ffhp);
1665 fill_post_wcc(tfhp);
1666 unlock_rename(tdentry, fdentry);
1667 ffhp->fh_locked = tfhp->fh_locked = 0;
1674 * Unlink a file or directory
1675 * N.B. After this call fhp needs an fh_put
1678 nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1679 char *fname, int flen)
1681 struct dentry *dentry, *rdentry;
1687 if (!flen || isdotent(fname, flen))
1689 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
1693 fh_lock_nested(fhp, I_MUTEX_PARENT);
1694 dentry = fhp->fh_dentry;
1695 dirp = dentry->d_inode;
1697 rdentry = lookup_one_len(fname, dentry, flen);
1698 host_err = PTR_ERR(rdentry);
1699 if (IS_ERR(rdentry))
1702 if (!rdentry->d_inode) {
1709 type = rdentry->d_inode->i_mode & S_IFMT;
1711 if (type != S_IFDIR) { /* It's UNLINK */
1713 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1714 (atomic_read(&rdentry->d_count) > 1)) {
1718 host_err = vfs_unlink(dirp, rdentry);
1719 } else { /* It's RMDIR */
1720 host_err = vfs_rmdir(dirp, rdentry);
1727 if (EX_ISSYNC(fhp->fh_export))
1728 host_err = nfsd_sync_dir(dentry);
1731 err = nfserrno(host_err);
1737 * Read entries from a directory.
1738 * The NFSv3/4 verifier we ignore for now.
1741 nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
1742 struct readdir_cd *cdp, filldir_t func)
1747 loff_t offset = *offsetp;
1749 err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file);
1753 offset = vfs_llseek(file, offset, 0);
1755 err = nfserrno((int)offset);
1760 * Read the directory entries. This silly loop is necessary because
1761 * readdir() is not guaranteed to fill up the entire buffer, but
1762 * may choose to do less.
1766 cdp->err = nfserr_eof; /* will be cleared on successful read */
1767 host_err = vfs_readdir(file, func, cdp);
1768 } while (host_err >=0 && cdp->err == nfs_ok);
1770 err = nfserrno(host_err);
1773 *offsetp = vfs_llseek(file, 0, 1);
1775 if (err == nfserr_eof || err == nfserr_toosmall)
1776 err = nfs_ok; /* can still be found in ->err */
1784 * Get file system stats
1785 * N.B. After this call fhp needs an fh_put
1788 nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat)
1790 __be32 err = fh_verify(rqstp, fhp, 0, MAY_NOP);
1791 if (!err && vfs_statfs(fhp->fh_dentry,stat))
1797 * Check for a user's access permissions to this inode.
1800 nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc)
1802 struct inode *inode = dentry->d_inode;
1808 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
1810 (acc & MAY_READ)? " read" : "",
1811 (acc & MAY_WRITE)? " write" : "",
1812 (acc & MAY_EXEC)? " exec" : "",
1813 (acc & MAY_SATTR)? " sattr" : "",
1814 (acc & MAY_TRUNC)? " trunc" : "",
1815 (acc & MAY_LOCK)? " lock" : "",
1816 (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "",
1818 IS_IMMUTABLE(inode)? " immut" : "",
1819 IS_APPEND(inode)? " append" : "",
1820 IS_RDONLY(inode)? " ro" : "");
1821 dprintk(" owner %d/%d user %d/%d\n",
1822 inode->i_uid, inode->i_gid, current->fsuid, current->fsgid);
1825 /* Normally we reject any write/sattr etc access on a read-only file
1826 * system. But if it is IRIX doing check on write-access for a
1827 * device special file, we ignore rofs.
1829 if (!(acc & MAY_LOCAL_ACCESS))
1830 if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) {
1831 if (EX_RDONLY(exp) || IS_RDONLY(inode))
1833 if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode))
1836 if ((acc & MAY_TRUNC) && IS_APPEND(inode))
1839 if (acc & MAY_LOCK) {
1840 /* If we cannot rely on authentication in NLM requests,
1841 * just allow locks, otherwise require read permission, or
1844 if (exp->ex_flags & NFSEXP_NOAUTHNLM)
1847 acc = MAY_READ | MAY_OWNER_OVERRIDE;
1850 * The file owner always gets access permission for accesses that
1851 * would normally be checked at open time. This is to make
1852 * file access work even when the client has done a fchmod(fd, 0).
1854 * However, `cp foo bar' should fail nevertheless when bar is
1855 * readonly. A sensible way to do this might be to reject all
1856 * attempts to truncate a read-only file, because a creat() call
1857 * always implies file truncation.
1858 * ... but this isn't really fair. A process may reasonably call
1859 * ftruncate on an open file descriptor on a file with perm 000.
1860 * We must trust the client to do permission checking - using "ACCESS"
1863 if ((acc & MAY_OWNER_OVERRIDE) &&
1864 inode->i_uid == current->fsuid)
1867 err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL);
1869 /* Allow read access to binaries even when mode 111 */
1870 if (err == -EACCES && S_ISREG(inode->i_mode) &&
1871 acc == (MAY_READ | MAY_OWNER_OVERRIDE))
1872 err = permission(inode, MAY_EXEC, NULL);
1874 return err? nfserrno(err) : 0;
1878 nfsd_racache_shutdown(void)
1882 dprintk("nfsd: freeing readahead buffers.\n");
1887 * Initialize readahead param cache
1890 nfsd_racache_init(int cache_size)
1899 if (cache_size < 2*RAPARM_HASH_SIZE)
1900 cache_size = 2*RAPARM_HASH_SIZE;
1901 raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL);
1905 "nfsd: Could not allocate memory read-ahead cache.\n");
1909 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size);
1910 for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) {
1911 raparm_hash[i].pb_head = NULL;
1912 spin_lock_init(&raparm_hash[i].pb_lock);
1914 nperbucket = cache_size >> RAPARM_HASH_BITS;
1915 for (i = 0; i < cache_size - 1; i++) {
1916 if (i % nperbucket == 0)
1917 raparm_hash[j++].pb_head = raparml + i;
1918 if (i % nperbucket < nperbucket-1)
1919 raparml[i].p_next = raparml + i + 1;
1922 nfsdstats.ra_size = cache_size;
1926 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
1928 nfsd_get_posix_acl(struct svc_fh *fhp, int type)
1930 struct inode *inode = fhp->fh_dentry->d_inode;
1934 struct posix_acl *acl;
1936 if (!IS_POSIXACL(inode))
1937 return ERR_PTR(-EOPNOTSUPP);
1940 case ACL_TYPE_ACCESS:
1941 name = POSIX_ACL_XATTR_ACCESS;
1943 case ACL_TYPE_DEFAULT:
1944 name = POSIX_ACL_XATTR_DEFAULT;
1947 return ERR_PTR(-EOPNOTSUPP);
1950 size = nfsd_getxattr(fhp->fh_dentry, name, &value);
1952 return ERR_PTR(size);
1954 acl = posix_acl_from_xattr(value, size);
1960 nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
1962 struct inode *inode = fhp->fh_dentry->d_inode;
1968 if (!IS_POSIXACL(inode) || !inode->i_op ||
1969 !inode->i_op->setxattr || !inode->i_op->removexattr)
1972 case ACL_TYPE_ACCESS:
1973 name = POSIX_ACL_XATTR_ACCESS;
1975 case ACL_TYPE_DEFAULT:
1976 name = POSIX_ACL_XATTR_DEFAULT;
1982 if (acl && acl->a_count) {
1983 size = posix_acl_xattr_size(acl->a_count);
1984 value = kmalloc(size, GFP_KERNEL);
1987 error = posix_acl_to_xattr(acl, value, size);
1995 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
1997 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
2000 error = vfs_removexattr(fhp->fh_dentry, name);
2001 if (error == -ENODATA)
2010 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */