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/ext2_fs.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 error = nfserr_attrnotsupp;
449 } else if (host_error < 0)
452 host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
456 if (S_ISDIR(inode->i_mode)) {
457 host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
465 posix_acl_release(pacl);
466 posix_acl_release(dpacl);
469 if (host_error == -EOPNOTSUPP)
470 error = nfserr_attrnotsupp;
472 error = nfserrno(host_error);
476 static struct posix_acl *
477 _get_posix_acl(struct dentry *dentry, char *key)
480 struct posix_acl *pacl = NULL;
483 buflen = nfsd_getxattr(dentry, key, &buf);
487 return ERR_PTR(buflen);
489 pacl = posix_acl_from_xattr(buf, buflen);
495 nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
497 struct inode *inode = dentry->d_inode;
499 struct posix_acl *pacl = NULL, *dpacl = NULL;
500 unsigned int flags = 0;
502 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
503 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
504 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
506 error = PTR_ERR(pacl);
511 if (S_ISDIR(inode->i_mode)) {
512 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
513 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
515 else if (IS_ERR(dpacl)) {
516 error = PTR_ERR(dpacl);
520 flags = NFS4_ACL_DIR;
523 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
525 error = PTR_ERR(*acl);
529 posix_acl_release(pacl);
530 posix_acl_release(dpacl);
534 #endif /* defined(CONFIG_NFS_V4) */
536 #ifdef CONFIG_NFSD_V3
538 * Check server access rights to a file system object
544 static struct accessmap nfs3_regaccess[] = {
545 { NFS3_ACCESS_READ, MAY_READ },
546 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
547 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC },
548 { NFS3_ACCESS_EXTEND, MAY_WRITE },
553 static struct accessmap nfs3_diraccess[] = {
554 { NFS3_ACCESS_READ, MAY_READ },
555 { NFS3_ACCESS_LOOKUP, MAY_EXEC },
556 { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC },
557 { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE },
558 { NFS3_ACCESS_DELETE, MAY_REMOVE },
563 static struct accessmap nfs3_anyaccess[] = {
564 /* Some clients - Solaris 2.6 at least, make an access call
565 * to the server to check for access for things like /dev/null
566 * (which really, the server doesn't care about). So
567 * We provide simple access checking for them, looking
568 * mainly at mode bits, and we make sure to ignore read-only
571 { NFS3_ACCESS_READ, MAY_READ },
572 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
573 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS },
574 { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS },
580 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
582 struct accessmap *map;
583 struct svc_export *export;
584 struct dentry *dentry;
585 u32 query, result = 0, sresult = 0;
588 error = fh_verify(rqstp, fhp, 0, MAY_NOP);
592 export = fhp->fh_export;
593 dentry = fhp->fh_dentry;
595 if (S_ISREG(dentry->d_inode->i_mode))
596 map = nfs3_regaccess;
597 else if (S_ISDIR(dentry->d_inode->i_mode))
598 map = nfs3_diraccess;
600 map = nfs3_anyaccess;
604 for (; map->access; map++) {
605 if (map->access & query) {
608 sresult |= map->access;
610 err2 = nfsd_permission(export, dentry, map->how);
613 result |= map->access;
616 /* the following error codes just mean the access was not allowed,
617 * rather than an error occurred */
621 /* simply don't "or" in the access bit. */
631 *supported = sresult;
636 #endif /* CONFIG_NFSD_V3 */
641 * Open an existing file or directory.
642 * The access argument indicates the type of open (read/write/lock)
643 * N.B. After this call fhp needs an fh_put
646 nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
647 int access, struct file **filp)
649 struct dentry *dentry;
651 int flags = O_RDONLY|O_LARGEFILE;
656 * If we get here, then the client has already done an "open",
657 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
658 * in case a chmod has now revoked permission.
660 err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE);
664 dentry = fhp->fh_dentry;
665 inode = dentry->d_inode;
667 /* Disallow write access to files with the append-only bit set
668 * or any access when mandatory locking enabled
671 if (IS_APPEND(inode) && (access & MAY_WRITE))
673 if (IS_ISMNDLK(inode))
680 * Check to see if there are any leases on this file.
681 * This may block while leases are broken.
683 host_err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0));
684 if (host_err == -EWOULDBLOCK)
685 host_err = -ETIMEDOUT;
686 if (host_err) /* NOMEM or WOULDBLOCK */
689 if (access & MAY_WRITE) {
690 if (access & MAY_READ)
691 flags = O_RDWR|O_LARGEFILE;
693 flags = O_WRONLY|O_LARGEFILE;
697 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags);
699 host_err = PTR_ERR(*filp);
701 err = nfserrno(host_err);
710 nfsd_close(struct file *filp)
717 * As this calls fsync (not fdatasync) there is no need for a write_inode
720 static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
721 const struct file_operations *fop)
723 struct inode *inode = dp->d_inode;
724 int (*fsync) (struct file *, struct dentry *, int);
727 err = filemap_fdatawrite(inode->i_mapping);
728 if (err == 0 && fop && (fsync = fop->fsync))
729 err = fsync(filp, dp, 0);
731 err = filemap_fdatawait(inode->i_mapping);
738 nfsd_sync(struct file *filp)
741 struct inode *inode = filp->f_path.dentry->d_inode;
742 dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name);
743 mutex_lock(&inode->i_mutex);
744 err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op);
745 mutex_unlock(&inode->i_mutex);
751 nfsd_sync_dir(struct dentry *dp)
753 return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
757 * Obtain the readahead parameters for the file
758 * specified by (dev, ino).
761 static inline struct raparms *
762 nfsd_get_raparms(dev_t dev, ino_t ino)
764 struct raparms *ra, **rap, **frap = NULL;
767 struct raparm_hbucket *rab;
769 hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK;
770 rab = &raparm_hash[hash];
772 spin_lock(&rab->pb_lock);
773 for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) {
774 if (ra->p_ino == ino && ra->p_dev == dev)
777 if (ra->p_count == 0)
780 depth = nfsdstats.ra_size*11/10;
782 spin_unlock(&rab->pb_lock);
792 if (rap != &rab->pb_head) {
794 ra->p_next = rab->pb_head;
798 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
799 spin_unlock(&rab->pb_lock);
804 * Grab and keep cached pages assosiated with a file in the svc_rqst
805 * so that they can be passed to the netowork sendmsg/sendpage routines
806 * directrly. They will be released after the sending has completed.
809 nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size)
811 unsigned long count = desc->count;
812 struct svc_rqst *rqstp = desc->arg.data;
813 struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
818 if (rqstp->rq_res.page_len == 0) {
823 rqstp->rq_res.page_base = offset;
824 rqstp->rq_res.page_len = size;
825 } else if (page != pp[-1]) {
831 rqstp->rq_res.page_len += size;
833 rqstp->rq_res.page_len += size;
835 desc->count = count - size;
836 desc->written += size;
841 nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
842 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
851 inode = file->f_path.dentry->d_inode;
853 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
854 (!lock_may_read(inode, offset, *count)))
858 /* Get readahead parameters */
859 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
862 file->f_ra = ra->p_ra;
864 if (file->f_op->sendfile && rqstp->rq_sendfile_ok) {
865 rqstp->rq_resused = 1;
866 host_err = file->f_op->sendfile(file, &offset, *count,
867 nfsd_read_actor, rqstp);
871 host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
875 /* Write back readahead params */
877 struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
878 spin_lock(&rab->pb_lock);
879 ra->p_ra = file->f_ra;
882 spin_unlock(&rab->pb_lock);
886 nfsdstats.io_read += host_err;
889 fsnotify_access(file->f_path.dentry);
891 err = nfserrno(host_err);
896 static void kill_suid(struct dentry *dentry)
899 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;
901 mutex_lock(&dentry->d_inode->i_mutex);
902 notify_change(dentry, &ia);
903 mutex_unlock(&dentry->d_inode->i_mutex);
907 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
908 loff_t offset, struct kvec *vec, int vlen,
909 unsigned long cnt, int *stablep)
911 struct svc_export *exp;
912 struct dentry *dentry;
917 int stable = *stablep;
922 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
923 (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt)))
927 dentry = file->f_path.dentry;
928 inode = dentry->d_inode;
929 exp = fhp->fh_export;
932 * Request sync writes if
933 * - the sync export option has been set, or
934 * - the client requested O_SYNC behavior (NFSv3 feature).
935 * - The file system doesn't support fsync().
936 * When gathered writes have been configured for this volume,
937 * flushing the data to disk is handled separately below.
940 if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */
942 *stablep = 2; /* FILE_SYNC */
947 if (stable && !EX_WGATHER(exp))
948 file->f_flags |= O_SYNC;
950 /* Write the data. */
951 oldfs = get_fs(); set_fs(KERNEL_DS);
952 host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
955 nfsdstats.io_write += cnt;
956 fsnotify_modify(file->f_path.dentry);
959 /* clear setuid/setgid flag after write */
960 if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID)))
963 if (host_err >= 0 && stable) {
964 static ino_t last_ino;
965 static dev_t last_dev;
968 * Gathered writes: If another process is currently
969 * writing to the file, there's a high chance
970 * this is another nfsd (triggered by a bulk write
971 * from a client's biod). Rather than syncing the
972 * file with each write request, we sleep for 10 msec.
974 * I don't know if this roughly approximates
975 * C. Juszak's idea of gathered writes, but it's a
976 * nice and simple solution (IMHO), and it seems to
979 if (EX_WGATHER(exp)) {
980 if (atomic_read(&inode->i_writecount) > 1
981 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
982 dprintk("nfsd: write defer %d\n", current->pid);
984 dprintk("nfsd: write resume %d\n", current->pid);
987 if (inode->i_state & I_DIRTY) {
988 dprintk("nfsd: write sync %d\n", current->pid);
989 host_err=nfsd_sync(file);
992 wake_up(&inode->i_wait);
995 last_ino = inode->i_ino;
996 last_dev = inode->i_sb->s_dev;
999 dprintk("nfsd: write complete host_err=%d\n", host_err);
1003 err = nfserrno(host_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;
1126 if (isdotent(fname, flen))
1129 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1133 dentry = fhp->fh_dentry;
1134 dirp = dentry->d_inode;
1136 err = nfserr_notdir;
1137 if(!dirp->i_op || !dirp->i_op->lookup)
1140 * Check whether the response file handle has been verified yet.
1141 * If it has, the parent directory should already be locked.
1143 if (!resfhp->fh_dentry) {
1144 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1145 fh_lock_nested(fhp, I_MUTEX_PARENT);
1146 dchild = lookup_one_len(fname, dentry, flen);
1147 host_err = PTR_ERR(dchild);
1150 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1154 /* called from nfsd_proc_create */
1155 dchild = dget(resfhp->fh_dentry);
1156 if (!fhp->fh_locked) {
1157 /* not actually possible */
1159 "nfsd_create: parent %s/%s not locked!\n",
1160 dentry->d_parent->d_name.name,
1161 dentry->d_name.name);
1167 * Make sure the child dentry is still negative ...
1170 if (dchild->d_inode) {
1171 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1172 dentry->d_name.name, dchild->d_name.name);
1176 if (!(iap->ia_valid & ATTR_MODE))
1178 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1181 * Get the dir op function pointer.
1186 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1189 host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1195 host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1198 printk("nfsd: bad file type %o in nfsd_create\n", type);
1204 if (EX_ISSYNC(fhp->fh_export)) {
1205 err = nfserrno(nfsd_sync_dir(dentry));
1206 write_inode_now(dchild->d_inode, 1);
1210 /* Set file attributes. Mode has already been set and
1211 * setting uid/gid works only for root. Irix appears to
1212 * send along the gid when it tries to implement setgid
1213 * directories via NFS.
1215 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
1216 __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1221 * Update the file handle to get the new inode info.
1224 err = fh_update(resfhp);
1226 if (dchild && !IS_ERR(dchild))
1231 err = nfserrno(host_err);
1235 #ifdef CONFIG_NFSD_V3
1237 * NFSv3 version of nfsd_create
1240 nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1241 char *fname, int flen, struct iattr *iap,
1242 struct svc_fh *resfhp, int createmode, u32 *verifier,
1243 int *truncp, int *created)
1245 struct dentry *dentry, *dchild = NULL;
1249 __u32 v_mtime=0, v_atime=0;
1255 if (isdotent(fname, flen))
1257 if (!(iap->ia_valid & ATTR_MODE))
1259 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1263 dentry = fhp->fh_dentry;
1264 dirp = dentry->d_inode;
1266 /* Get all the sanity checks out of the way before
1267 * we lock the parent. */
1268 err = nfserr_notdir;
1269 if(!dirp->i_op || !dirp->i_op->lookup)
1271 fh_lock_nested(fhp, I_MUTEX_PARENT);
1274 * Compose the response file handle.
1276 dchild = lookup_one_len(fname, dentry, flen);
1277 host_err = PTR_ERR(dchild);
1281 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1285 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1286 /* solaris7 gets confused (bugid 4218508) if these have
1287 * the high bit set, so just clear the high bits.
1289 v_mtime = verifier[0]&0x7fffffff;
1290 v_atime = verifier[1]&0x7fffffff;
1293 if (dchild->d_inode) {
1296 switch (createmode) {
1297 case NFS3_CREATE_UNCHECKED:
1298 if (! S_ISREG(dchild->d_inode->i_mode))
1301 /* in nfsv4, we need to treat this case a little
1302 * differently. we don't want to truncate the
1303 * file now; this would be wrong if the OPEN
1304 * fails for some other reason. furthermore,
1305 * if the size is nonzero, we should ignore it
1306 * according to spec!
1308 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1311 iap->ia_valid &= ATTR_SIZE;
1315 case NFS3_CREATE_EXCLUSIVE:
1316 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
1317 && dchild->d_inode->i_atime.tv_sec == v_atime
1318 && dchild->d_inode->i_size == 0 )
1321 case NFS3_CREATE_GUARDED:
1327 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1333 if (EX_ISSYNC(fhp->fh_export)) {
1334 err = nfserrno(nfsd_sync_dir(dentry));
1335 /* setattr will sync the child (or not) */
1338 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1339 /* Cram the verifier into atime/mtime */
1340 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1341 | ATTR_MTIME_SET|ATTR_ATIME_SET;
1342 /* XXX someone who knows this better please fix it for nsec */
1343 iap->ia_mtime.tv_sec = v_mtime;
1344 iap->ia_atime.tv_sec = v_atime;
1345 iap->ia_mtime.tv_nsec = 0;
1346 iap->ia_atime.tv_nsec = 0;
1349 /* Set file attributes.
1350 * Irix appears to send along the gid when it tries to
1351 * implement setgid directories via NFS. Clear out all that cruft.
1354 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
1355 __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1361 * Update the filehandle to get the new inode info.
1364 err = fh_update(resfhp);
1368 if (dchild && !IS_ERR(dchild))
1373 err = nfserrno(host_err);
1376 #endif /* CONFIG_NFSD_V3 */
1379 * Read a symlink. On entry, *lenp must contain the maximum path length that
1380 * fits into the buffer. On return, it contains the true length.
1381 * N.B. After this call fhp needs an fh_put
1384 nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1386 struct dentry *dentry;
1387 struct inode *inode;
1392 err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP);
1396 dentry = fhp->fh_dentry;
1397 inode = dentry->d_inode;
1400 if (!inode->i_op || !inode->i_op->readlink)
1403 touch_atime(fhp->fh_export->ex_mnt, dentry);
1404 /* N.B. Why does this call need a get_fs()??
1405 * Remove the set_fs and watch the fireworks:-) --okir
1408 oldfs = get_fs(); set_fs(KERNEL_DS);
1409 host_err = inode->i_op->readlink(dentry, buf, *lenp);
1420 err = nfserrno(host_err);
1425 * Create a symlink and look up its inode
1426 * N.B. After this call _both_ fhp and resfhp need an fh_put
1429 nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1430 char *fname, int flen,
1431 char *path, int plen,
1432 struct svc_fh *resfhp,
1435 struct dentry *dentry, *dnew;
1444 if (isdotent(fname, flen))
1447 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1451 dentry = fhp->fh_dentry;
1452 dnew = lookup_one_len(fname, dentry, flen);
1453 host_err = PTR_ERR(dnew);
1458 /* Only the MODE ATTRibute is even vaguely meaningful */
1459 if (iap && (iap->ia_valid & ATTR_MODE))
1460 mode = iap->ia_mode & S_IALLUGO;
1462 if (unlikely(path[plen] != 0)) {
1463 char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1464 if (path_alloced == NULL)
1467 strncpy(path_alloced, path, plen);
1468 path_alloced[plen] = 0;
1469 host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
1470 kfree(path_alloced);
1473 host_err = vfs_symlink(dentry->d_inode, dnew, path, mode);
1476 if (EX_ISSYNC(fhp->fh_export))
1477 host_err = nfsd_sync_dir(dentry);
1479 err = nfserrno(host_err);
1482 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1484 if (err==0) err = cerr;
1489 err = nfserrno(host_err);
1495 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1498 nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1499 char *name, int len, struct svc_fh *tfhp)
1501 struct dentry *ddir, *dnew, *dold;
1502 struct inode *dirp, *dest;
1506 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
1509 err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP);
1517 if (isdotent(name, len))
1520 fh_lock_nested(ffhp, I_MUTEX_PARENT);
1521 ddir = ffhp->fh_dentry;
1522 dirp = ddir->d_inode;
1524 dnew = lookup_one_len(name, ddir, len);
1525 host_err = PTR_ERR(dnew);
1529 dold = tfhp->fh_dentry;
1530 dest = dold->d_inode;
1532 host_err = vfs_link(dold, dirp, dnew);
1534 if (EX_ISSYNC(ffhp->fh_export)) {
1535 err = nfserrno(nfsd_sync_dir(ddir));
1536 write_inode_now(dest, 1);
1540 if (host_err == -EXDEV && rqstp->rq_vers == 2)
1543 err = nfserrno(host_err);
1553 err = nfserrno(host_err);
1559 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1562 nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1563 struct svc_fh *tfhp, char *tname, int tlen)
1565 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap;
1566 struct inode *fdir, *tdir;
1570 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
1573 err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
1577 fdentry = ffhp->fh_dentry;
1578 fdir = fdentry->d_inode;
1580 tdentry = tfhp->fh_dentry;
1581 tdir = tdentry->d_inode;
1583 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1584 if (ffhp->fh_export != tfhp->fh_export)
1588 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1591 /* cannot use fh_lock as we need deadlock protective ordering
1592 * so do it by hand */
1593 trap = lock_rename(tdentry, fdentry);
1594 ffhp->fh_locked = tfhp->fh_locked = 1;
1598 odentry = lookup_one_len(fname, fdentry, flen);
1599 host_err = PTR_ERR(odentry);
1600 if (IS_ERR(odentry))
1604 if (!odentry->d_inode)
1607 if (odentry == trap)
1610 ndentry = lookup_one_len(tname, tdentry, tlen);
1611 host_err = PTR_ERR(ndentry);
1612 if (IS_ERR(ndentry))
1614 host_err = -ENOTEMPTY;
1615 if (ndentry == trap)
1619 if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1620 ((atomic_read(&odentry->d_count) > 1)
1621 || (atomic_read(&ndentry->d_count) > 1))) {
1625 host_err = vfs_rename(fdir, odentry, tdir, ndentry);
1626 if (!host_err && EX_ISSYNC(tfhp->fh_export)) {
1627 host_err = nfsd_sync_dir(tdentry);
1629 host_err = nfsd_sync_dir(fdentry);
1637 err = nfserrno(host_err);
1639 /* we cannot reply on fh_unlock on the two filehandles,
1640 * as that would do the wrong thing if the two directories
1641 * were the same, so again we do it by hand
1643 fill_post_wcc(ffhp);
1644 fill_post_wcc(tfhp);
1645 unlock_rename(tdentry, fdentry);
1646 ffhp->fh_locked = tfhp->fh_locked = 0;
1653 * Unlink a file or directory
1654 * N.B. After this call fhp needs an fh_put
1657 nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1658 char *fname, int flen)
1660 struct dentry *dentry, *rdentry;
1666 if (!flen || isdotent(fname, flen))
1668 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
1672 fh_lock_nested(fhp, I_MUTEX_PARENT);
1673 dentry = fhp->fh_dentry;
1674 dirp = dentry->d_inode;
1676 rdentry = lookup_one_len(fname, dentry, flen);
1677 host_err = PTR_ERR(rdentry);
1678 if (IS_ERR(rdentry))
1681 if (!rdentry->d_inode) {
1688 type = rdentry->d_inode->i_mode & S_IFMT;
1690 if (type != S_IFDIR) { /* It's UNLINK */
1692 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1693 (atomic_read(&rdentry->d_count) > 1)) {
1697 host_err = vfs_unlink(dirp, rdentry);
1698 } else { /* It's RMDIR */
1699 host_err = vfs_rmdir(dirp, rdentry);
1706 if (EX_ISSYNC(fhp->fh_export))
1707 host_err = nfsd_sync_dir(dentry);
1710 err = nfserrno(host_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, filldir_t func)
1726 loff_t offset = *offsetp;
1728 err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file);
1732 offset = vfs_llseek(file, offset, 0);
1734 err = nfserrno((int)offset);
1739 * Read the directory entries. This silly loop is necessary because
1740 * readdir() is not guaranteed to fill up the entire buffer, but
1741 * may choose to do less.
1745 cdp->err = nfserr_eof; /* will be cleared on successful read */
1746 host_err = vfs_readdir(file, func, cdp);
1747 } while (host_err >=0 && cdp->err == nfs_ok);
1749 err = nfserrno(host_err);
1752 *offsetp = vfs_llseek(file, 0, 1);
1754 if (err == nfserr_eof || err == nfserr_toosmall)
1755 err = nfs_ok; /* can still be found in ->err */
1763 * Get file system stats
1764 * N.B. After this call fhp needs an fh_put
1767 nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat)
1769 __be32 err = fh_verify(rqstp, fhp, 0, MAY_NOP);
1770 if (!err && vfs_statfs(fhp->fh_dentry,stat))
1776 * Check for a user's access permissions to this inode.
1779 nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc)
1781 struct inode *inode = dentry->d_inode;
1787 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
1789 (acc & MAY_READ)? " read" : "",
1790 (acc & MAY_WRITE)? " write" : "",
1791 (acc & MAY_EXEC)? " exec" : "",
1792 (acc & MAY_SATTR)? " sattr" : "",
1793 (acc & MAY_TRUNC)? " trunc" : "",
1794 (acc & MAY_LOCK)? " lock" : "",
1795 (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "",
1797 IS_IMMUTABLE(inode)? " immut" : "",
1798 IS_APPEND(inode)? " append" : "",
1799 IS_RDONLY(inode)? " ro" : "");
1800 dprintk(" owner %d/%d user %d/%d\n",
1801 inode->i_uid, inode->i_gid, current->fsuid, current->fsgid);
1804 /* Normally we reject any write/sattr etc access on a read-only file
1805 * system. But if it is IRIX doing check on write-access for a
1806 * device special file, we ignore rofs.
1808 if (!(acc & MAY_LOCAL_ACCESS))
1809 if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) {
1810 if (EX_RDONLY(exp) || IS_RDONLY(inode))
1812 if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode))
1815 if ((acc & MAY_TRUNC) && IS_APPEND(inode))
1818 if (acc & MAY_LOCK) {
1819 /* If we cannot rely on authentication in NLM requests,
1820 * just allow locks, otherwise require read permission, or
1823 if (exp->ex_flags & NFSEXP_NOAUTHNLM)
1826 acc = MAY_READ | MAY_OWNER_OVERRIDE;
1829 * The file owner always gets access permission for accesses that
1830 * would normally be checked at open time. This is to make
1831 * file access work even when the client has done a fchmod(fd, 0).
1833 * However, `cp foo bar' should fail nevertheless when bar is
1834 * readonly. A sensible way to do this might be to reject all
1835 * attempts to truncate a read-only file, because a creat() call
1836 * always implies file truncation.
1837 * ... but this isn't really fair. A process may reasonably call
1838 * ftruncate on an open file descriptor on a file with perm 000.
1839 * We must trust the client to do permission checking - using "ACCESS"
1842 if ((acc & MAY_OWNER_OVERRIDE) &&
1843 inode->i_uid == current->fsuid)
1846 err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL);
1848 /* Allow read access to binaries even when mode 111 */
1849 if (err == -EACCES && S_ISREG(inode->i_mode) &&
1850 acc == (MAY_READ | MAY_OWNER_OVERRIDE))
1851 err = permission(inode, MAY_EXEC, NULL);
1853 return err? nfserrno(err) : 0;
1857 nfsd_racache_shutdown(void)
1861 dprintk("nfsd: freeing readahead buffers.\n");
1866 * Initialize readahead param cache
1869 nfsd_racache_init(int cache_size)
1878 if (cache_size < 2*RAPARM_HASH_SIZE)
1879 cache_size = 2*RAPARM_HASH_SIZE;
1880 raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL);
1884 "nfsd: Could not allocate memory read-ahead cache.\n");
1888 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size);
1889 for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) {
1890 raparm_hash[i].pb_head = NULL;
1891 spin_lock_init(&raparm_hash[i].pb_lock);
1893 nperbucket = cache_size >> RAPARM_HASH_BITS;
1894 for (i = 0; i < cache_size - 1; i++) {
1895 if (i % nperbucket == 0)
1896 raparm_hash[j++].pb_head = raparml + i;
1897 if (i % nperbucket < nperbucket-1)
1898 raparml[i].p_next = raparml + i + 1;
1901 nfsdstats.ra_size = cache_size;
1905 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
1907 nfsd_get_posix_acl(struct svc_fh *fhp, int type)
1909 struct inode *inode = fhp->fh_dentry->d_inode;
1913 struct posix_acl *acl;
1915 if (!IS_POSIXACL(inode))
1916 return ERR_PTR(-EOPNOTSUPP);
1919 case ACL_TYPE_ACCESS:
1920 name = POSIX_ACL_XATTR_ACCESS;
1922 case ACL_TYPE_DEFAULT:
1923 name = POSIX_ACL_XATTR_DEFAULT;
1926 return ERR_PTR(-EOPNOTSUPP);
1929 size = nfsd_getxattr(fhp->fh_dentry, name, &value);
1931 return ERR_PTR(size);
1933 acl = posix_acl_from_xattr(value, size);
1939 nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
1941 struct inode *inode = fhp->fh_dentry->d_inode;
1947 if (!IS_POSIXACL(inode) || !inode->i_op ||
1948 !inode->i_op->setxattr || !inode->i_op->removexattr)
1951 case ACL_TYPE_ACCESS:
1952 name = POSIX_ACL_XATTR_ACCESS;
1954 case ACL_TYPE_DEFAULT:
1955 name = POSIX_ACL_XATTR_DEFAULT;
1961 if (acl && acl->a_count) {
1962 size = posix_acl_xattr_size(acl->a_count);
1963 value = kmalloc(size, GFP_KERNEL);
1966 error = posix_acl_to_xattr(acl, value, size);
1974 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
1976 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
1979 error = vfs_removexattr(fhp->fh_dentry, name);
1980 if (error == -ENODATA)
1989 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */