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 = exp_get_by_name(exp->ex_client, mnt, mounts, &rqstp->rq_chandle);
123 if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) {
124 /* successfully crossed mount point */
130 if (exp2) exp_put(exp2);
139 * Look up one component of a pathname.
140 * N.B. After this call _both_ fhp and resfh need an fh_put
142 * If the lookup would cross a mountpoint, and the mounted filesystem
143 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
144 * accepted as it stands and the mounted directory is
145 * returned. Otherwise the covered directory is returned.
146 * NOTE: this mountpoint crossing is not supported properly by all
147 * clients and is explicitly disallowed for NFSv3
148 * NeilBrown <neilb@cse.unsw.edu.au>
151 nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
152 int len, struct svc_fh *resfh)
154 struct svc_export *exp;
155 struct dentry *dparent;
156 struct dentry *dentry;
160 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
162 /* Obtain dentry and export. */
163 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
167 dparent = fhp->fh_dentry;
168 exp = fhp->fh_export;
173 /* Lookup the name, but don't follow links */
174 if (isdotent(name, len)) {
176 dentry = dget(dparent);
177 else if (dparent != exp->ex_dentry) {
178 dentry = dget_parent(dparent);
179 } else if (!EX_NOHIDE(exp))
180 dentry = dget(dparent); /* .. == . just like at / */
182 /* checking mountpoint crossing is very different when stepping up */
183 struct svc_export *exp2 = NULL;
185 struct vfsmount *mnt = mntget(exp->ex_mnt);
186 dentry = dget(dparent);
187 while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry))
189 dp = dget_parent(dentry);
193 exp2 = exp_parent(exp->ex_client, mnt, dentry,
196 host_err = PTR_ERR(exp2);
203 dentry = dget(dparent);
212 dentry = lookup_one_len(name, dparent, len);
213 host_err = PTR_ERR(dentry);
217 * check if we have crossed a mount point ...
219 if (d_mountpoint(dentry)) {
220 if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
227 * Note: we compose the file handle now, but as the
228 * dentry may be negative, it may need to be updated.
230 err = fh_compose(resfh, exp, dentry, fhp);
231 if (!err && !dentry->d_inode)
239 err = nfserrno(host_err);
244 * Set various file attributes.
245 * N.B. After this call fhp needs an fh_put
248 nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
249 int check_guard, time_t guardtime)
251 struct dentry *dentry;
253 int accmode = MAY_SATTR;
260 if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
261 accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE;
262 if (iap->ia_valid & ATTR_SIZE)
266 err = fh_verify(rqstp, fhp, ftype, accmode);
270 dentry = fhp->fh_dentry;
271 inode = dentry->d_inode;
273 /* Ignore any mode updates on symlinks */
274 if (S_ISLNK(inode->i_mode))
275 iap->ia_valid &= ~ATTR_MODE;
280 /* NFSv2 does not differentiate between "set-[ac]time-to-now"
281 * which only requires access, and "set-[ac]time-to-X" which
282 * requires ownership.
283 * So if it looks like it might be "set both to the same time which
284 * is close to now", and if inode_change_ok fails, then we
285 * convert to "set to now" instead of "set to explicit time"
287 * We only call inode_change_ok as the last test as technically
288 * it is not an interface that we should be using. It is only
289 * valid if the filesystem does not define it's own i_op->setattr.
291 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
292 #define MAX_TOUCH_TIME_ERROR (30*60)
293 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET
294 && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec
296 /* Looks probable. Now just make sure time is in the right ballpark.
297 * Solaris, at least, doesn't seem to care what the time request is.
298 * We require it be within 30 minutes of now.
300 time_t delta = iap->ia_atime.tv_sec - get_seconds();
301 if (delta<0) delta = -delta;
302 if (delta < MAX_TOUCH_TIME_ERROR &&
303 inode_change_ok(inode, iap) != 0) {
304 /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
305 * this will cause notify_change to set these times to "now"
307 iap->ia_valid &= ~BOTH_TIME_SET;
311 /* The size case is special. It changes the file as well as the attributes. */
312 if (iap->ia_valid & ATTR_SIZE) {
313 if (iap->ia_size < inode->i_size) {
314 err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
320 * If we are changing the size of the file, then
321 * we need to break all leases.
323 host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
324 if (host_err == -EWOULDBLOCK)
325 host_err = -ETIMEDOUT;
326 if (host_err) /* ENOMEM or EWOULDBLOCK */
329 host_err = get_write_access(inode);
334 host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
336 put_write_access(inode);
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 host_err = notify_change(dentry, iap);
362 err = nfserrno(host_err);
366 put_write_access(inode);
368 if (EX_ISSYNC(fhp->fh_export))
369 write_inode_now(inode, 1);
374 err = nfserrno(host_err);
378 #if defined(CONFIG_NFSD_V2_ACL) || \
379 defined(CONFIG_NFSD_V3_ACL) || \
380 defined(CONFIG_NFSD_V4)
381 static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
385 buflen = vfs_getxattr(dentry, key, NULL, 0);
389 *buf = kmalloc(buflen, GFP_KERNEL);
393 return vfs_getxattr(dentry, key, *buf, buflen);
397 #if defined(CONFIG_NFSD_V4)
399 set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
406 buflen = posix_acl_xattr_size(pacl->a_count);
407 buf = kmalloc(buflen, GFP_KERNEL);
412 len = posix_acl_to_xattr(pacl, buf, buflen);
418 error = vfs_setxattr(dentry, key, buf, len, 0);
425 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
426 struct nfs4_acl *acl)
430 struct dentry *dentry;
432 struct posix_acl *pacl = NULL, *dpacl = NULL;
433 unsigned int flags = 0;
436 error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR);
440 dentry = fhp->fh_dentry;
441 inode = dentry->d_inode;
442 if (S_ISDIR(inode->i_mode))
443 flags = NFS4_ACL_DIR;
445 host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
446 if (host_error == -EINVAL) {
447 return nfserr_attrnotsupp;
448 } else if (host_error < 0)
451 host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
455 if (S_ISDIR(inode->i_mode))
456 host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
459 posix_acl_release(pacl);
460 posix_acl_release(dpacl);
462 if (host_error == -EOPNOTSUPP)
463 return nfserr_attrnotsupp;
465 return nfserrno(host_error);
468 static struct posix_acl *
469 _get_posix_acl(struct dentry *dentry, char *key)
472 struct posix_acl *pacl = NULL;
475 buflen = nfsd_getxattr(dentry, key, &buf);
479 return ERR_PTR(buflen);
481 pacl = posix_acl_from_xattr(buf, buflen);
487 nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
489 struct inode *inode = dentry->d_inode;
491 struct posix_acl *pacl = NULL, *dpacl = NULL;
492 unsigned int flags = 0;
494 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
495 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
496 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
498 error = PTR_ERR(pacl);
503 if (S_ISDIR(inode->i_mode)) {
504 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
505 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
507 else if (IS_ERR(dpacl)) {
508 error = PTR_ERR(dpacl);
512 flags = NFS4_ACL_DIR;
515 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
517 error = PTR_ERR(*acl);
521 posix_acl_release(pacl);
522 posix_acl_release(dpacl);
526 #endif /* defined(CONFIG_NFS_V4) */
528 #ifdef CONFIG_NFSD_V3
530 * Check server access rights to a file system object
536 static struct accessmap nfs3_regaccess[] = {
537 { NFS3_ACCESS_READ, MAY_READ },
538 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
539 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC },
540 { NFS3_ACCESS_EXTEND, MAY_WRITE },
545 static struct accessmap nfs3_diraccess[] = {
546 { NFS3_ACCESS_READ, MAY_READ },
547 { NFS3_ACCESS_LOOKUP, MAY_EXEC },
548 { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC },
549 { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE },
550 { NFS3_ACCESS_DELETE, MAY_REMOVE },
555 static struct accessmap nfs3_anyaccess[] = {
556 /* Some clients - Solaris 2.6 at least, make an access call
557 * to the server to check for access for things like /dev/null
558 * (which really, the server doesn't care about). So
559 * We provide simple access checking for them, looking
560 * mainly at mode bits, and we make sure to ignore read-only
563 { NFS3_ACCESS_READ, MAY_READ },
564 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
565 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS },
566 { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS },
572 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
574 struct accessmap *map;
575 struct svc_export *export;
576 struct dentry *dentry;
577 u32 query, result = 0, sresult = 0;
580 error = fh_verify(rqstp, fhp, 0, MAY_NOP);
584 export = fhp->fh_export;
585 dentry = fhp->fh_dentry;
587 if (S_ISREG(dentry->d_inode->i_mode))
588 map = nfs3_regaccess;
589 else if (S_ISDIR(dentry->d_inode->i_mode))
590 map = nfs3_diraccess;
592 map = nfs3_anyaccess;
596 for (; map->access; map++) {
597 if (map->access & query) {
600 sresult |= map->access;
602 err2 = nfsd_permission(export, dentry, map->how);
605 result |= map->access;
608 /* the following error codes just mean the access was not allowed,
609 * rather than an error occurred */
613 /* simply don't "or" in the access bit. */
623 *supported = sresult;
628 #endif /* CONFIG_NFSD_V3 */
633 * Open an existing file or directory.
634 * The access argument indicates the type of open (read/write/lock)
635 * N.B. After this call fhp needs an fh_put
638 nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
639 int access, struct file **filp)
641 struct dentry *dentry;
643 int flags = O_RDONLY|O_LARGEFILE;
648 * If we get here, then the client has already done an "open",
649 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
650 * in case a chmod has now revoked permission.
652 err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE);
656 dentry = fhp->fh_dentry;
657 inode = dentry->d_inode;
659 /* Disallow write access to files with the append-only bit set
660 * or any access when mandatory locking enabled
663 if (IS_APPEND(inode) && (access & MAY_WRITE))
665 if (IS_ISMNDLK(inode))
672 * Check to see if there are any leases on this file.
673 * This may block while leases are broken.
675 host_err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0));
676 if (host_err == -EWOULDBLOCK)
677 host_err = -ETIMEDOUT;
678 if (host_err) /* NOMEM or WOULDBLOCK */
681 if (access & MAY_WRITE) {
682 if (access & MAY_READ)
683 flags = O_RDWR|O_LARGEFILE;
685 flags = O_WRONLY|O_LARGEFILE;
689 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags);
691 host_err = PTR_ERR(*filp);
693 err = nfserrno(host_err);
702 nfsd_close(struct file *filp)
709 * As this calls fsync (not fdatasync) there is no need for a write_inode
712 static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
713 const struct file_operations *fop)
715 struct inode *inode = dp->d_inode;
716 int (*fsync) (struct file *, struct dentry *, int);
719 err = filemap_fdatawrite(inode->i_mapping);
720 if (err == 0 && fop && (fsync = fop->fsync))
721 err = fsync(filp, dp, 0);
723 err = filemap_fdatawait(inode->i_mapping);
730 nfsd_sync(struct file *filp)
733 struct inode *inode = filp->f_path.dentry->d_inode;
734 dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name);
735 mutex_lock(&inode->i_mutex);
736 err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op);
737 mutex_unlock(&inode->i_mutex);
743 nfsd_sync_dir(struct dentry *dp)
745 return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
749 * Obtain the readahead parameters for the file
750 * specified by (dev, ino).
753 static inline struct raparms *
754 nfsd_get_raparms(dev_t dev, ino_t ino)
756 struct raparms *ra, **rap, **frap = NULL;
759 struct raparm_hbucket *rab;
761 hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK;
762 rab = &raparm_hash[hash];
764 spin_lock(&rab->pb_lock);
765 for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) {
766 if (ra->p_ino == ino && ra->p_dev == dev)
769 if (ra->p_count == 0)
772 depth = nfsdstats.ra_size*11/10;
774 spin_unlock(&rab->pb_lock);
784 if (rap != &rab->pb_head) {
786 ra->p_next = rab->pb_head;
790 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
791 spin_unlock(&rab->pb_lock);
796 * Grab and keep cached pages associated with a file in the svc_rqst
797 * so that they can be passed to the network sendmsg/sendpage routines
798 * directly. They will be released after the sending has completed.
801 nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
802 struct splice_desc *sd)
804 struct svc_rqst *rqstp = sd->u.data;
805 struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
806 struct page *page = buf->page;
810 ret = buf->ops->confirm(pipe, buf);
816 if (rqstp->rq_res.page_len == 0) {
821 rqstp->rq_res.page_base = buf->offset;
822 rqstp->rq_res.page_len = size;
823 } else if (page != pp[-1]) {
829 rqstp->rq_res.page_len += size;
831 rqstp->rq_res.page_len += size;
836 static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
837 struct splice_desc *sd)
839 return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
843 nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
844 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
853 inode = file->f_path.dentry->d_inode;
855 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
856 (!lock_may_read(inode, offset, *count)))
860 /* Get readahead parameters */
861 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
864 file->f_ra = ra->p_ra;
866 if (file->f_op->splice_read && rqstp->rq_splice_ok) {
867 struct splice_desc sd = {
874 rqstp->rq_resused = 1;
875 host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
879 host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
883 /* Write back readahead params */
885 struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
886 spin_lock(&rab->pb_lock);
887 ra->p_ra = file->f_ra;
890 spin_unlock(&rab->pb_lock);
894 nfsdstats.io_read += host_err;
897 fsnotify_access(file->f_path.dentry);
899 err = nfserrno(host_err);
904 static void kill_suid(struct dentry *dentry)
907 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;
909 mutex_lock(&dentry->d_inode->i_mutex);
910 notify_change(dentry, &ia);
911 mutex_unlock(&dentry->d_inode->i_mutex);
915 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
916 loff_t offset, struct kvec *vec, int vlen,
917 unsigned long cnt, int *stablep)
919 struct svc_export *exp;
920 struct dentry *dentry;
925 int stable = *stablep;
930 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
931 (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt)))
935 dentry = file->f_path.dentry;
936 inode = dentry->d_inode;
937 exp = fhp->fh_export;
940 * Request sync writes if
941 * - the sync export option has been set, or
942 * - the client requested O_SYNC behavior (NFSv3 feature).
943 * - The file system doesn't support fsync().
944 * When gathered writes have been configured for this volume,
945 * flushing the data to disk is handled separately below.
948 if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */
950 *stablep = 2; /* FILE_SYNC */
955 if (stable && !EX_WGATHER(exp))
956 file->f_flags |= O_SYNC;
958 /* Write the data. */
959 oldfs = get_fs(); set_fs(KERNEL_DS);
960 host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
963 nfsdstats.io_write += cnt;
964 fsnotify_modify(file->f_path.dentry);
967 /* clear setuid/setgid flag after write */
968 if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID)))
971 if (host_err >= 0 && stable) {
972 static ino_t last_ino;
973 static dev_t last_dev;
976 * Gathered writes: If another process is currently
977 * writing to the file, there's a high chance
978 * this is another nfsd (triggered by a bulk write
979 * from a client's biod). Rather than syncing the
980 * file with each write request, we sleep for 10 msec.
982 * I don't know if this roughly approximates
983 * C. Juszak's idea of gathered writes, but it's a
984 * nice and simple solution (IMHO), and it seems to
987 if (EX_WGATHER(exp)) {
988 if (atomic_read(&inode->i_writecount) > 1
989 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
990 dprintk("nfsd: write defer %d\n", current->pid);
992 dprintk("nfsd: write resume %d\n", current->pid);
995 if (inode->i_state & I_DIRTY) {
996 dprintk("nfsd: write sync %d\n", current->pid);
997 host_err=nfsd_sync(file);
1000 wake_up(&inode->i_wait);
1003 last_ino = inode->i_ino;
1004 last_dev = inode->i_sb->s_dev;
1007 dprintk("nfsd: write complete host_err=%d\n", host_err);
1011 err = nfserrno(host_err);
1017 * Read data from a file. count must contain the requested read count
1018 * on entry. On return, *count contains the number of bytes actually read.
1019 * N.B. After this call fhp needs an fh_put
1022 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1023 loff_t offset, struct kvec *vec, int vlen,
1024 unsigned long *count)
1029 err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
1030 MAY_READ|MAY_OWNER_OVERRIDE);
1033 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1035 err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file);
1038 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1046 * Write data to a file.
1047 * The stable flag requests synchronous writes.
1048 * N.B. After this call fhp needs an fh_put
1051 nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1052 loff_t offset, struct kvec *vec, int vlen, unsigned long cnt,
1058 err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
1059 MAY_WRITE|MAY_OWNER_OVERRIDE);
1062 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
1065 err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file);
1070 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
1078 #ifdef CONFIG_NFSD_V3
1080 * Commit all pending writes to stable storage.
1081 * Strictly speaking, we could sync just the indicated file region here,
1082 * but there's currently no way we can ask the VFS to do so.
1084 * Unfortunately we cannot lock the file to make sure we return full WCC
1085 * data to the client, as locking happens lower down in the filesystem.
1088 nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
1089 loff_t offset, unsigned long count)
1094 if ((u64)count > ~(u64)offset)
1095 return nfserr_inval;
1097 if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0)
1099 if (EX_ISSYNC(fhp->fh_export)) {
1100 if (file->f_op && file->f_op->fsync) {
1101 err = nfserrno(nfsd_sync(file));
1103 err = nfserr_notsupp;
1110 #endif /* CONFIG_NFSD_V3 */
1113 * Create a file (regular, directory, device, fifo); UNIX sockets
1114 * not yet implemented.
1115 * If the response fh has been verified, the parent directory should
1116 * already be locked. Note that the parent directory is left locked.
1118 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1121 nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
1122 char *fname, int flen, struct iattr *iap,
1123 int type, dev_t rdev, struct svc_fh *resfhp)
1125 struct dentry *dentry, *dchild = NULL;
1134 if (isdotent(fname, flen))
1137 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1141 dentry = fhp->fh_dentry;
1142 dirp = dentry->d_inode;
1144 err = nfserr_notdir;
1145 if(!dirp->i_op || !dirp->i_op->lookup)
1148 * Check whether the response file handle has been verified yet.
1149 * If it has, the parent directory should already be locked.
1151 if (!resfhp->fh_dentry) {
1152 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1153 fh_lock_nested(fhp, I_MUTEX_PARENT);
1154 dchild = lookup_one_len(fname, dentry, flen);
1155 host_err = PTR_ERR(dchild);
1158 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1162 /* called from nfsd_proc_create */
1163 dchild = dget(resfhp->fh_dentry);
1164 if (!fhp->fh_locked) {
1165 /* not actually possible */
1167 "nfsd_create: parent %s/%s not locked!\n",
1168 dentry->d_parent->d_name.name,
1169 dentry->d_name.name);
1175 * Make sure the child dentry is still negative ...
1178 if (dchild->d_inode) {
1179 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1180 dentry->d_name.name, dchild->d_name.name);
1184 if (!(iap->ia_valid & ATTR_MODE))
1186 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1189 * Get the dir op function pointer.
1194 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1197 host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1203 host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1206 printk("nfsd: bad file type %o in nfsd_create\n", type);
1212 if (EX_ISSYNC(fhp->fh_export)) {
1213 err = nfserrno(nfsd_sync_dir(dentry));
1214 write_inode_now(dchild->d_inode, 1);
1218 /* Set file attributes. Mode has already been set and
1219 * setting uid/gid works only for root. Irix appears to
1220 * send along the gid when it tries to implement setgid
1221 * directories via NFS.
1223 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
1224 __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1229 * Update the file handle to get the new inode info.
1232 err = fh_update(resfhp);
1234 if (dchild && !IS_ERR(dchild))
1239 err = nfserrno(host_err);
1243 #ifdef CONFIG_NFSD_V3
1245 * NFSv3 version of nfsd_create
1248 nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1249 char *fname, int flen, struct iattr *iap,
1250 struct svc_fh *resfhp, int createmode, u32 *verifier,
1251 int *truncp, int *created)
1253 struct dentry *dentry, *dchild = NULL;
1257 __u32 v_mtime=0, v_atime=0;
1263 if (isdotent(fname, flen))
1265 if (!(iap->ia_valid & ATTR_MODE))
1267 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1271 dentry = fhp->fh_dentry;
1272 dirp = dentry->d_inode;
1274 /* Get all the sanity checks out of the way before
1275 * we lock the parent. */
1276 err = nfserr_notdir;
1277 if(!dirp->i_op || !dirp->i_op->lookup)
1279 fh_lock_nested(fhp, I_MUTEX_PARENT);
1282 * Compose the response file handle.
1284 dchild = lookup_one_len(fname, dentry, flen);
1285 host_err = PTR_ERR(dchild);
1289 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1293 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1294 /* solaris7 gets confused (bugid 4218508) if these have
1295 * the high bit set, so just clear the high bits.
1297 v_mtime = verifier[0]&0x7fffffff;
1298 v_atime = verifier[1]&0x7fffffff;
1301 if (dchild->d_inode) {
1304 switch (createmode) {
1305 case NFS3_CREATE_UNCHECKED:
1306 if (! S_ISREG(dchild->d_inode->i_mode))
1309 /* in nfsv4, we need to treat this case a little
1310 * differently. we don't want to truncate the
1311 * file now; this would be wrong if the OPEN
1312 * fails for some other reason. furthermore,
1313 * if the size is nonzero, we should ignore it
1314 * according to spec!
1316 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1319 iap->ia_valid &= ATTR_SIZE;
1323 case NFS3_CREATE_EXCLUSIVE:
1324 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
1325 && dchild->d_inode->i_atime.tv_sec == v_atime
1326 && dchild->d_inode->i_size == 0 )
1329 case NFS3_CREATE_GUARDED:
1335 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1341 if (EX_ISSYNC(fhp->fh_export)) {
1342 err = nfserrno(nfsd_sync_dir(dentry));
1343 /* setattr will sync the child (or not) */
1346 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1347 /* Cram the verifier into atime/mtime */
1348 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1349 | ATTR_MTIME_SET|ATTR_ATIME_SET;
1350 /* XXX someone who knows this better please fix it for nsec */
1351 iap->ia_mtime.tv_sec = v_mtime;
1352 iap->ia_atime.tv_sec = v_atime;
1353 iap->ia_mtime.tv_nsec = 0;
1354 iap->ia_atime.tv_nsec = 0;
1357 /* Set file attributes.
1358 * Irix appears to send along the gid when it tries to
1359 * implement setgid directories via NFS. Clear out all that cruft.
1362 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
1363 __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1369 * Update the filehandle to get the new inode info.
1372 err = fh_update(resfhp);
1376 if (dchild && !IS_ERR(dchild))
1381 err = nfserrno(host_err);
1384 #endif /* CONFIG_NFSD_V3 */
1387 * Read a symlink. On entry, *lenp must contain the maximum path length that
1388 * fits into the buffer. On return, it contains the true length.
1389 * N.B. After this call fhp needs an fh_put
1392 nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1394 struct dentry *dentry;
1395 struct inode *inode;
1400 err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP);
1404 dentry = fhp->fh_dentry;
1405 inode = dentry->d_inode;
1408 if (!inode->i_op || !inode->i_op->readlink)
1411 touch_atime(fhp->fh_export->ex_mnt, dentry);
1412 /* N.B. Why does this call need a get_fs()??
1413 * Remove the set_fs and watch the fireworks:-) --okir
1416 oldfs = get_fs(); set_fs(KERNEL_DS);
1417 host_err = inode->i_op->readlink(dentry, buf, *lenp);
1428 err = nfserrno(host_err);
1433 * Create a symlink and look up its inode
1434 * N.B. After this call _both_ fhp and resfhp need an fh_put
1437 nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1438 char *fname, int flen,
1439 char *path, int plen,
1440 struct svc_fh *resfhp,
1443 struct dentry *dentry, *dnew;
1452 if (isdotent(fname, flen))
1455 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1459 dentry = fhp->fh_dentry;
1460 dnew = lookup_one_len(fname, dentry, flen);
1461 host_err = PTR_ERR(dnew);
1466 /* Only the MODE ATTRibute is even vaguely meaningful */
1467 if (iap && (iap->ia_valid & ATTR_MODE))
1468 mode = iap->ia_mode & S_IALLUGO;
1470 if (unlikely(path[plen] != 0)) {
1471 char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1472 if (path_alloced == NULL)
1475 strncpy(path_alloced, path, plen);
1476 path_alloced[plen] = 0;
1477 host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
1478 kfree(path_alloced);
1481 host_err = vfs_symlink(dentry->d_inode, dnew, path, mode);
1484 if (EX_ISSYNC(fhp->fh_export))
1485 host_err = nfsd_sync_dir(dentry);
1487 err = nfserrno(host_err);
1490 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1492 if (err==0) err = cerr;
1497 err = nfserrno(host_err);
1503 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1506 nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1507 char *name, int len, struct svc_fh *tfhp)
1509 struct dentry *ddir, *dnew, *dold;
1510 struct inode *dirp, *dest;
1514 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
1517 err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP);
1525 if (isdotent(name, len))
1528 fh_lock_nested(ffhp, I_MUTEX_PARENT);
1529 ddir = ffhp->fh_dentry;
1530 dirp = ddir->d_inode;
1532 dnew = lookup_one_len(name, ddir, len);
1533 host_err = PTR_ERR(dnew);
1537 dold = tfhp->fh_dentry;
1538 dest = dold->d_inode;
1540 host_err = vfs_link(dold, dirp, dnew);
1542 if (EX_ISSYNC(ffhp->fh_export)) {
1543 err = nfserrno(nfsd_sync_dir(ddir));
1544 write_inode_now(dest, 1);
1548 if (host_err == -EXDEV && rqstp->rq_vers == 2)
1551 err = nfserrno(host_err);
1561 err = nfserrno(host_err);
1567 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1570 nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1571 struct svc_fh *tfhp, char *tname, int tlen)
1573 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap;
1574 struct inode *fdir, *tdir;
1578 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
1581 err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
1585 fdentry = ffhp->fh_dentry;
1586 fdir = fdentry->d_inode;
1588 tdentry = tfhp->fh_dentry;
1589 tdir = tdentry->d_inode;
1591 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1592 if (ffhp->fh_export != tfhp->fh_export)
1596 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1599 /* cannot use fh_lock as we need deadlock protective ordering
1600 * so do it by hand */
1601 trap = lock_rename(tdentry, fdentry);
1602 ffhp->fh_locked = tfhp->fh_locked = 1;
1606 odentry = lookup_one_len(fname, fdentry, flen);
1607 host_err = PTR_ERR(odentry);
1608 if (IS_ERR(odentry))
1612 if (!odentry->d_inode)
1615 if (odentry == trap)
1618 ndentry = lookup_one_len(tname, tdentry, tlen);
1619 host_err = PTR_ERR(ndentry);
1620 if (IS_ERR(ndentry))
1622 host_err = -ENOTEMPTY;
1623 if (ndentry == trap)
1627 if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1628 ((atomic_read(&odentry->d_count) > 1)
1629 || (atomic_read(&ndentry->d_count) > 1))) {
1633 host_err = vfs_rename(fdir, odentry, tdir, ndentry);
1634 if (!host_err && EX_ISSYNC(tfhp->fh_export)) {
1635 host_err = nfsd_sync_dir(tdentry);
1637 host_err = nfsd_sync_dir(fdentry);
1645 err = nfserrno(host_err);
1647 /* we cannot reply on fh_unlock on the two filehandles,
1648 * as that would do the wrong thing if the two directories
1649 * were the same, so again we do it by hand
1651 fill_post_wcc(ffhp);
1652 fill_post_wcc(tfhp);
1653 unlock_rename(tdentry, fdentry);
1654 ffhp->fh_locked = tfhp->fh_locked = 0;
1661 * Unlink a file or directory
1662 * N.B. After this call fhp needs an fh_put
1665 nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1666 char *fname, int flen)
1668 struct dentry *dentry, *rdentry;
1674 if (!flen || isdotent(fname, flen))
1676 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
1680 fh_lock_nested(fhp, I_MUTEX_PARENT);
1681 dentry = fhp->fh_dentry;
1682 dirp = dentry->d_inode;
1684 rdentry = lookup_one_len(fname, dentry, flen);
1685 host_err = PTR_ERR(rdentry);
1686 if (IS_ERR(rdentry))
1689 if (!rdentry->d_inode) {
1696 type = rdentry->d_inode->i_mode & S_IFMT;
1698 if (type != S_IFDIR) { /* It's UNLINK */
1700 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1701 (atomic_read(&rdentry->d_count) > 1)) {
1705 host_err = vfs_unlink(dirp, rdentry);
1706 } else { /* It's RMDIR */
1707 host_err = vfs_rmdir(dirp, rdentry);
1714 if (EX_ISSYNC(fhp->fh_export))
1715 host_err = nfsd_sync_dir(dentry);
1718 err = nfserrno(host_err);
1724 * Read entries from a directory.
1725 * The NFSv3/4 verifier we ignore for now.
1728 nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
1729 struct readdir_cd *cdp, filldir_t func)
1734 loff_t offset = *offsetp;
1736 err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file);
1740 offset = vfs_llseek(file, offset, 0);
1742 err = nfserrno((int)offset);
1747 * Read the directory entries. This silly loop is necessary because
1748 * readdir() is not guaranteed to fill up the entire buffer, but
1749 * may choose to do less.
1753 cdp->err = nfserr_eof; /* will be cleared on successful read */
1754 host_err = vfs_readdir(file, func, cdp);
1755 } while (host_err >=0 && cdp->err == nfs_ok);
1757 err = nfserrno(host_err);
1760 *offsetp = vfs_llseek(file, 0, 1);
1762 if (err == nfserr_eof || err == nfserr_toosmall)
1763 err = nfs_ok; /* can still be found in ->err */
1771 * Get file system stats
1772 * N.B. After this call fhp needs an fh_put
1775 nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat)
1777 __be32 err = fh_verify(rqstp, fhp, 0, MAY_NOP);
1778 if (!err && vfs_statfs(fhp->fh_dentry,stat))
1784 * Check for a user's access permissions to this inode.
1787 nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc)
1789 struct inode *inode = dentry->d_inode;
1795 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
1797 (acc & MAY_READ)? " read" : "",
1798 (acc & MAY_WRITE)? " write" : "",
1799 (acc & MAY_EXEC)? " exec" : "",
1800 (acc & MAY_SATTR)? " sattr" : "",
1801 (acc & MAY_TRUNC)? " trunc" : "",
1802 (acc & MAY_LOCK)? " lock" : "",
1803 (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "",
1805 IS_IMMUTABLE(inode)? " immut" : "",
1806 IS_APPEND(inode)? " append" : "",
1807 IS_RDONLY(inode)? " ro" : "");
1808 dprintk(" owner %d/%d user %d/%d\n",
1809 inode->i_uid, inode->i_gid, current->fsuid, current->fsgid);
1812 /* Normally we reject any write/sattr etc access on a read-only file
1813 * system. But if it is IRIX doing check on write-access for a
1814 * device special file, we ignore rofs.
1816 if (!(acc & MAY_LOCAL_ACCESS))
1817 if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) {
1818 if (EX_RDONLY(exp) || IS_RDONLY(inode))
1820 if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode))
1823 if ((acc & MAY_TRUNC) && IS_APPEND(inode))
1826 if (acc & MAY_LOCK) {
1827 /* If we cannot rely on authentication in NLM requests,
1828 * just allow locks, otherwise require read permission, or
1831 if (exp->ex_flags & NFSEXP_NOAUTHNLM)
1834 acc = MAY_READ | MAY_OWNER_OVERRIDE;
1837 * The file owner always gets access permission for accesses that
1838 * would normally be checked at open time. This is to make
1839 * file access work even when the client has done a fchmod(fd, 0).
1841 * However, `cp foo bar' should fail nevertheless when bar is
1842 * readonly. A sensible way to do this might be to reject all
1843 * attempts to truncate a read-only file, because a creat() call
1844 * always implies file truncation.
1845 * ... but this isn't really fair. A process may reasonably call
1846 * ftruncate on an open file descriptor on a file with perm 000.
1847 * We must trust the client to do permission checking - using "ACCESS"
1850 if ((acc & MAY_OWNER_OVERRIDE) &&
1851 inode->i_uid == current->fsuid)
1854 err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL);
1856 /* Allow read access to binaries even when mode 111 */
1857 if (err == -EACCES && S_ISREG(inode->i_mode) &&
1858 acc == (MAY_READ | MAY_OWNER_OVERRIDE))
1859 err = permission(inode, MAY_EXEC, NULL);
1861 return err? nfserrno(err) : 0;
1865 nfsd_racache_shutdown(void)
1869 dprintk("nfsd: freeing readahead buffers.\n");
1874 * Initialize readahead param cache
1877 nfsd_racache_init(int cache_size)
1886 if (cache_size < 2*RAPARM_HASH_SIZE)
1887 cache_size = 2*RAPARM_HASH_SIZE;
1888 raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL);
1892 "nfsd: Could not allocate memory read-ahead cache.\n");
1896 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size);
1897 for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) {
1898 raparm_hash[i].pb_head = NULL;
1899 spin_lock_init(&raparm_hash[i].pb_lock);
1901 nperbucket = cache_size >> RAPARM_HASH_BITS;
1902 for (i = 0; i < cache_size - 1; i++) {
1903 if (i % nperbucket == 0)
1904 raparm_hash[j++].pb_head = raparml + i;
1905 if (i % nperbucket < nperbucket-1)
1906 raparml[i].p_next = raparml + i + 1;
1909 nfsdstats.ra_size = cache_size;
1913 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
1915 nfsd_get_posix_acl(struct svc_fh *fhp, int type)
1917 struct inode *inode = fhp->fh_dentry->d_inode;
1921 struct posix_acl *acl;
1923 if (!IS_POSIXACL(inode))
1924 return ERR_PTR(-EOPNOTSUPP);
1927 case ACL_TYPE_ACCESS:
1928 name = POSIX_ACL_XATTR_ACCESS;
1930 case ACL_TYPE_DEFAULT:
1931 name = POSIX_ACL_XATTR_DEFAULT;
1934 return ERR_PTR(-EOPNOTSUPP);
1937 size = nfsd_getxattr(fhp->fh_dentry, name, &value);
1939 return ERR_PTR(size);
1941 acl = posix_acl_from_xattr(value, size);
1947 nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
1949 struct inode *inode = fhp->fh_dentry->d_inode;
1955 if (!IS_POSIXACL(inode) || !inode->i_op ||
1956 !inode->i_op->setxattr || !inode->i_op->removexattr)
1959 case ACL_TYPE_ACCESS:
1960 name = POSIX_ACL_XATTR_ACCESS;
1962 case ACL_TYPE_DEFAULT:
1963 name = POSIX_ACL_XATTR_DEFAULT;
1969 if (acl && acl->a_count) {
1970 size = posix_acl_xattr_size(acl->a_count);
1971 value = kmalloc(size, GFP_KERNEL);
1974 error = posix_acl_to_xattr(acl, value, size);
1982 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
1984 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
1987 error = vfs_removexattr(fhp->fh_dentry, name);
1988 if (error == -ENODATA)
1997 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */