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>
58 #include <linux/ima.h>
60 #include <asm/uaccess.h>
62 #define NFSDDBG_FACILITY NFSDDBG_FILEOP
66 * This is a cache of readahead params that help us choose the proper
67 * readahead strategy. Initially, we set all readahead parameters to 0
68 * and let the VFS handle things.
69 * If you increase the number of cached files very much, you'll need to
70 * add a hash table here.
73 struct raparms *p_next;
78 struct file_ra_state p_ra;
79 unsigned int p_hindex;
82 struct raparm_hbucket {
83 struct raparms *pb_head;
85 } ____cacheline_aligned_in_smp;
87 #define RAPARM_HASH_BITS 4
88 #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS)
89 #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1)
90 static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE];
93 * Called from nfsd_lookup and encode_dirent. Check if we have crossed
95 * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged,
96 * or nfs_ok having possibly changed *dpp and *expp
99 nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
100 struct svc_export **expp)
102 struct svc_export *exp = *expp, *exp2 = NULL;
103 struct dentry *dentry = *dpp;
104 struct path path = {.mnt = mntget(exp->ex_path.mnt),
105 .dentry = dget(dentry)};
108 while (follow_down(&path.mnt, &path.dentry) &&
109 d_mountpoint(path.dentry))
112 exp2 = rqst_exp_get_by_name(rqstp, &path);
114 if (PTR_ERR(exp2) != -ENOENT)
119 if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) {
120 /* successfully crossed mount point */
122 * This is subtle: path.dentry is *not* on path.mnt
123 * at this point. The only reason we are safe is that
124 * original mnt is pinned down by exp, so we should
125 * put path *before* putting exp
128 path.dentry = dentry;
139 nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
140 const char *name, unsigned 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, NFSD_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_path.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 path path = {.mnt = mntget(exp->ex_path.mnt),
173 .dentry = dget(dparent)};
175 while (path.dentry == path.mnt->mnt_root &&
178 dp = dget_parent(path.dentry);
182 exp2 = rqst_exp_parent(rqstp, &path);
183 if (PTR_ERR(exp2) == -ENOENT) {
184 dentry = dget(dparent);
185 } else if (IS_ERR(exp2)) {
186 host_err = PTR_ERR(exp2);
190 dentry = dget(path.dentry);
198 dentry = lookup_one_len(name, dparent, len);
199 host_err = PTR_ERR(dentry);
203 * check if we have crossed a mount point ...
205 if (d_mountpoint(dentry)) {
206 if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
212 *dentry_ret = dentry;
218 return nfserrno(host_err);
222 * Look up one component of a pathname.
223 * N.B. After this call _both_ fhp and resfh need an fh_put
225 * If the lookup would cross a mountpoint, and the mounted filesystem
226 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
227 * accepted as it stands and the mounted directory is
228 * returned. Otherwise the covered directory is returned.
229 * NOTE: this mountpoint crossing is not supported properly by all
230 * clients and is explicitly disallowed for NFSv3
231 * NeilBrown <neilb@cse.unsw.edu.au>
234 nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
235 unsigned int len, struct svc_fh *resfh)
237 struct svc_export *exp;
238 struct dentry *dentry;
241 err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry);
244 err = check_nfsd_access(exp, rqstp);
248 * Note: we compose the file handle now, but as the
249 * dentry may be negative, it may need to be updated.
251 err = fh_compose(resfh, exp, dentry, fhp);
252 if (!err && !dentry->d_inode)
262 * Set various file attributes.
263 * N.B. After this call fhp needs an fh_put
266 nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
267 int check_guard, time_t guardtime)
269 struct dentry *dentry;
271 int accmode = NFSD_MAY_SATTR;
277 if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
278 accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE;
279 if (iap->ia_valid & ATTR_SIZE)
283 err = fh_verify(rqstp, fhp, ftype, accmode);
287 dentry = fhp->fh_dentry;
288 inode = dentry->d_inode;
290 /* Ignore any mode updates on symlinks */
291 if (S_ISLNK(inode->i_mode))
292 iap->ia_valid &= ~ATTR_MODE;
298 * NFSv2 does not differentiate between "set-[ac]time-to-now"
299 * which only requires access, and "set-[ac]time-to-X" which
300 * requires ownership.
301 * So if it looks like it might be "set both to the same time which
302 * is close to now", and if inode_change_ok fails, then we
303 * convert to "set to now" instead of "set to explicit time"
305 * We only call inode_change_ok as the last test as technically
306 * it is not an interface that we should be using. It is only
307 * valid if the filesystem does not define it's own i_op->setattr.
309 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
310 #define MAX_TOUCH_TIME_ERROR (30*60)
311 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
312 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
316 * Now just make sure time is in the right ballpark.
317 * Solaris, at least, doesn't seem to care what the time
318 * request is. We require it be within 30 minutes of now.
320 time_t delta = iap->ia_atime.tv_sec - get_seconds();
323 if (delta < MAX_TOUCH_TIME_ERROR &&
324 inode_change_ok(inode, iap) != 0) {
326 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
327 * This will cause notify_change to set these times
330 iap->ia_valid &= ~BOTH_TIME_SET;
335 * The size case is special.
336 * It changes the file as well as the attributes.
338 if (iap->ia_valid & ATTR_SIZE) {
339 if (iap->ia_size < inode->i_size) {
340 err = nfsd_permission(rqstp, fhp->fh_export, dentry,
341 NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE);
347 * If we are changing the size of the file, then
348 * we need to break all leases.
350 host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
351 if (host_err == -EWOULDBLOCK)
352 host_err = -ETIMEDOUT;
353 if (host_err) /* ENOMEM or EWOULDBLOCK */
356 host_err = get_write_access(inode);
361 host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
363 put_write_access(inode);
369 /* sanitize the mode change */
370 if (iap->ia_valid & ATTR_MODE) {
371 iap->ia_mode &= S_IALLUGO;
372 iap->ia_mode |= (inode->i_mode & ~S_IALLUGO);
375 /* Revoke setuid/setgid on chown */
376 if (!S_ISDIR(inode->i_mode) &&
377 (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) ||
378 ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) {
379 iap->ia_valid |= ATTR_KILL_PRIV;
380 if (iap->ia_valid & ATTR_MODE) {
381 /* we're setting mode too, just clear the s*id bits */
382 iap->ia_mode &= ~S_ISUID;
383 if (iap->ia_mode & S_IXGRP)
384 iap->ia_mode &= ~S_ISGID;
386 /* set ATTR_KILL_* bits and let VFS handle it */
387 iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID);
391 /* Change the attributes. */
393 iap->ia_valid |= ATTR_CTIME;
395 err = nfserr_notsync;
396 if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
398 host_err = notify_change(dentry, iap);
399 err = nfserrno(host_err);
403 put_write_access(inode);
405 if (EX_ISSYNC(fhp->fh_export))
406 write_inode_now(inode, 1);
411 err = nfserrno(host_err);
415 #if defined(CONFIG_NFSD_V2_ACL) || \
416 defined(CONFIG_NFSD_V3_ACL) || \
417 defined(CONFIG_NFSD_V4)
418 static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
423 buflen = vfs_getxattr(dentry, key, NULL, 0);
427 *buf = kmalloc(buflen, GFP_KERNEL);
431 ret = vfs_getxattr(dentry, key, *buf, buflen);
438 #if defined(CONFIG_NFSD_V4)
440 set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
447 buflen = posix_acl_xattr_size(pacl->a_count);
448 buf = kmalloc(buflen, GFP_KERNEL);
453 len = posix_acl_to_xattr(pacl, buf, buflen);
459 error = vfs_setxattr(dentry, key, buf, len, 0);
466 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
467 struct nfs4_acl *acl)
471 struct dentry *dentry;
473 struct posix_acl *pacl = NULL, *dpacl = NULL;
474 unsigned int flags = 0;
477 error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR);
481 dentry = fhp->fh_dentry;
482 inode = dentry->d_inode;
483 if (S_ISDIR(inode->i_mode))
484 flags = NFS4_ACL_DIR;
486 host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
487 if (host_error == -EINVAL) {
488 return nfserr_attrnotsupp;
489 } else if (host_error < 0)
492 host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
496 if (S_ISDIR(inode->i_mode))
497 host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
500 posix_acl_release(pacl);
501 posix_acl_release(dpacl);
503 if (host_error == -EOPNOTSUPP)
504 return nfserr_attrnotsupp;
506 return nfserrno(host_error);
509 static struct posix_acl *
510 _get_posix_acl(struct dentry *dentry, char *key)
513 struct posix_acl *pacl = NULL;
516 buflen = nfsd_getxattr(dentry, key, &buf);
520 return ERR_PTR(buflen);
522 pacl = posix_acl_from_xattr(buf, buflen);
528 nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
530 struct inode *inode = dentry->d_inode;
532 struct posix_acl *pacl = NULL, *dpacl = NULL;
533 unsigned int flags = 0;
535 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
536 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
537 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
539 error = PTR_ERR(pacl);
544 if (S_ISDIR(inode->i_mode)) {
545 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
546 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
548 else if (IS_ERR(dpacl)) {
549 error = PTR_ERR(dpacl);
553 flags = NFS4_ACL_DIR;
556 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
558 error = PTR_ERR(*acl);
562 posix_acl_release(pacl);
563 posix_acl_release(dpacl);
567 #endif /* defined(CONFIG_NFS_V4) */
569 #ifdef CONFIG_NFSD_V3
571 * Check server access rights to a file system object
577 static struct accessmap nfs3_regaccess[] = {
578 { NFS3_ACCESS_READ, NFSD_MAY_READ },
579 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
580 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
581 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE },
586 static struct accessmap nfs3_diraccess[] = {
587 { NFS3_ACCESS_READ, NFSD_MAY_READ },
588 { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC },
589 { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC},
590 { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE },
591 { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE },
596 static struct accessmap nfs3_anyaccess[] = {
597 /* Some clients - Solaris 2.6 at least, make an access call
598 * to the server to check for access for things like /dev/null
599 * (which really, the server doesn't care about). So
600 * We provide simple access checking for them, looking
601 * mainly at mode bits, and we make sure to ignore read-only
604 { NFS3_ACCESS_READ, NFSD_MAY_READ },
605 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
606 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
607 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
613 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
615 struct accessmap *map;
616 struct svc_export *export;
617 struct dentry *dentry;
618 u32 query, result = 0, sresult = 0;
621 error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
625 export = fhp->fh_export;
626 dentry = fhp->fh_dentry;
628 if (S_ISREG(dentry->d_inode->i_mode))
629 map = nfs3_regaccess;
630 else if (S_ISDIR(dentry->d_inode->i_mode))
631 map = nfs3_diraccess;
633 map = nfs3_anyaccess;
637 for (; map->access; map++) {
638 if (map->access & query) {
641 sresult |= map->access;
643 err2 = nfsd_permission(rqstp, export, dentry, map->how);
646 result |= map->access;
649 /* the following error codes just mean the access was not allowed,
650 * rather than an error occurred */
654 /* simply don't "or" in the access bit. */
664 *supported = sresult;
669 #endif /* CONFIG_NFSD_V3 */
674 * Open an existing file or directory.
675 * The access argument indicates the type of open (read/write/lock)
676 * N.B. After this call fhp needs an fh_put
679 nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
680 int access, struct file **filp)
682 const struct cred *cred = current_cred();
683 struct dentry *dentry;
685 int flags = O_RDONLY|O_LARGEFILE;
690 * If we get here, then the client has already done an "open",
691 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
692 * in case a chmod has now revoked permission.
694 err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE);
698 dentry = fhp->fh_dentry;
699 inode = dentry->d_inode;
701 /* Disallow write access to files with the append-only bit set
702 * or any access when mandatory locking enabled
705 if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE))
708 * We must ignore files (but only files) which might have mandatory
709 * locks on them because there is no way to know if the accesser has
712 if (S_ISREG((inode)->i_mode) && mandatory_lock(inode))
719 * Check to see if there are any leases on this file.
720 * This may block while leases are broken.
722 host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? FMODE_WRITE : 0));
723 if (host_err == -EWOULDBLOCK)
724 host_err = -ETIMEDOUT;
725 if (host_err) /* NOMEM or WOULDBLOCK */
728 if (access & NFSD_MAY_WRITE) {
729 if (access & NFSD_MAY_READ)
730 flags = O_RDWR|O_LARGEFILE;
732 flags = O_WRONLY|O_LARGEFILE;
736 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt),
739 host_err = PTR_ERR(*filp);
741 ima_counts_get(*filp);
743 err = nfserrno(host_err);
752 nfsd_close(struct file *filp)
759 * As this calls fsync (not fdatasync) there is no need for a write_inode
762 static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
763 const struct file_operations *fop)
765 struct inode *inode = dp->d_inode;
766 int (*fsync) (struct file *, struct dentry *, int);
769 err = filemap_fdatawrite(inode->i_mapping);
770 if (err == 0 && fop && (fsync = fop->fsync))
771 err = fsync(filp, dp, 0);
773 err = filemap_fdatawait(inode->i_mapping);
779 nfsd_sync(struct file *filp)
782 struct inode *inode = filp->f_path.dentry->d_inode;
783 dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name);
784 mutex_lock(&inode->i_mutex);
785 err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op);
786 mutex_unlock(&inode->i_mutex);
792 nfsd_sync_dir(struct dentry *dp)
794 return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
798 * Obtain the readahead parameters for the file
799 * specified by (dev, ino).
802 static inline struct raparms *
803 nfsd_get_raparms(dev_t dev, ino_t ino)
805 struct raparms *ra, **rap, **frap = NULL;
808 struct raparm_hbucket *rab;
810 hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK;
811 rab = &raparm_hash[hash];
813 spin_lock(&rab->pb_lock);
814 for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) {
815 if (ra->p_ino == ino && ra->p_dev == dev)
818 if (ra->p_count == 0)
821 depth = nfsdstats.ra_size*11/10;
823 spin_unlock(&rab->pb_lock);
833 if (rap != &rab->pb_head) {
835 ra->p_next = rab->pb_head;
839 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
840 spin_unlock(&rab->pb_lock);
845 * Grab and keep cached pages associated with a file in the svc_rqst
846 * so that they can be passed to the network sendmsg/sendpage routines
847 * directly. They will be released after the sending has completed.
850 nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
851 struct splice_desc *sd)
853 struct svc_rqst *rqstp = sd->u.data;
854 struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
855 struct page *page = buf->page;
859 ret = buf->ops->confirm(pipe, buf);
865 if (rqstp->rq_res.page_len == 0) {
870 rqstp->rq_res.page_base = buf->offset;
871 rqstp->rq_res.page_len = size;
872 } else if (page != pp[-1]) {
878 rqstp->rq_res.page_len += size;
880 rqstp->rq_res.page_len += size;
885 static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
886 struct splice_desc *sd)
888 return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
891 static inline int svc_msnfs(struct svc_fh *ffhp)
894 return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS);
901 nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
902 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
911 inode = file->f_path.dentry->d_inode;
913 if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count))
916 /* Get readahead parameters */
917 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
920 file->f_ra = ra->p_ra;
922 if (file->f_op->splice_read && rqstp->rq_splice_ok) {
923 struct splice_desc sd = {
930 rqstp->rq_resused = 1;
931 host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
935 host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
939 /* Write back readahead params */
941 struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
942 spin_lock(&rab->pb_lock);
943 ra->p_ra = file->f_ra;
946 spin_unlock(&rab->pb_lock);
950 nfsdstats.io_read += host_err;
953 fsnotify_access(file->f_path.dentry);
955 err = nfserrno(host_err);
960 static void kill_suid(struct dentry *dentry)
963 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
965 mutex_lock(&dentry->d_inode->i_mutex);
966 notify_change(dentry, &ia);
967 mutex_unlock(&dentry->d_inode->i_mutex);
971 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
972 loff_t offset, struct kvec *vec, int vlen,
973 unsigned long *cnt, int *stablep)
975 struct svc_export *exp;
976 struct dentry *dentry;
981 int stable = *stablep;
986 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
987 (!lock_may_write(file->f_path.dentry->d_inode, offset, *cnt)))
991 dentry = file->f_path.dentry;
992 inode = dentry->d_inode;
993 exp = fhp->fh_export;
996 * Request sync writes if
997 * - the sync export option has been set, or
998 * - the client requested O_SYNC behavior (NFSv3 feature).
999 * - The file system doesn't support fsync().
1000 * When gathered writes have been configured for this volume,
1001 * flushing the data to disk is handled separately below.
1004 if (!file->f_op->fsync) {/* COMMIT3 cannot work */
1006 *stablep = 2; /* FILE_SYNC */
1009 if (!EX_ISSYNC(exp))
1011 if (stable && !EX_WGATHER(exp)) {
1012 spin_lock(&file->f_lock);
1013 file->f_flags |= O_SYNC;
1014 spin_unlock(&file->f_lock);
1017 /* Write the data. */
1018 oldfs = get_fs(); set_fs(KERNEL_DS);
1019 host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
1021 if (host_err >= 0) {
1023 nfsdstats.io_write += host_err;
1024 fsnotify_modify(file->f_path.dentry);
1027 /* clear setuid/setgid flag after write */
1028 if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID)))
1031 if (host_err >= 0 && stable) {
1032 static ino_t last_ino;
1033 static dev_t last_dev;
1036 * Gathered writes: If another process is currently
1037 * writing to the file, there's a high chance
1038 * this is another nfsd (triggered by a bulk write
1039 * from a client's biod). Rather than syncing the
1040 * file with each write request, we sleep for 10 msec.
1042 * I don't know if this roughly approximates
1043 * C. Juszak's idea of gathered writes, but it's a
1044 * nice and simple solution (IMHO), and it seems to
1047 if (EX_WGATHER(exp)) {
1048 if (atomic_read(&inode->i_writecount) > 1
1049 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
1050 dprintk("nfsd: write defer %d\n", task_pid_nr(current));
1052 dprintk("nfsd: write resume %d\n", task_pid_nr(current));
1055 if (inode->i_state & I_DIRTY) {
1056 dprintk("nfsd: write sync %d\n", task_pid_nr(current));
1057 host_err=nfsd_sync(file);
1060 wake_up(&inode->i_wait);
1063 last_ino = inode->i_ino;
1064 last_dev = inode->i_sb->s_dev;
1067 dprintk("nfsd: write complete host_err=%d\n", host_err);
1071 err = nfserrno(host_err);
1077 * Read data from a file. count must contain the requested read count
1078 * on entry. On return, *count contains the number of bytes actually read.
1079 * N.B. After this call fhp needs an fh_put
1082 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1083 loff_t offset, struct kvec *vec, int vlen,
1084 unsigned long *count)
1089 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
1090 NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
1093 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1095 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
1098 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1106 * Write data to a file.
1107 * The stable flag requests synchronous writes.
1108 * N.B. After this call fhp needs an fh_put
1111 nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1112 loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt,
1118 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
1119 NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE);
1122 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
1125 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
1130 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
1138 #ifdef CONFIG_NFSD_V3
1140 * Commit all pending writes to stable storage.
1141 * Strictly speaking, we could sync just the indicated file region here,
1142 * but there's currently no way we can ask the VFS to do so.
1144 * Unfortunately we cannot lock the file to make sure we return full WCC
1145 * data to the client, as locking happens lower down in the filesystem.
1148 nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
1149 loff_t offset, unsigned long count)
1154 if ((u64)count > ~(u64)offset)
1155 return nfserr_inval;
1157 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
1160 if (EX_ISSYNC(fhp->fh_export)) {
1161 if (file->f_op && file->f_op->fsync) {
1162 err = nfserrno(nfsd_sync(file));
1164 err = nfserr_notsupp;
1171 #endif /* CONFIG_NFSD_V3 */
1174 nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp,
1178 * Mode has already been set earlier in create:
1180 iap->ia_valid &= ~ATTR_MODE;
1182 * Setting uid/gid works only for root. Irix appears to
1183 * send along the gid on create when it tries to implement
1184 * setgid directories via NFS:
1186 if (current_fsuid() != 0)
1187 iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
1189 return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1193 /* HPUX client sometimes creates a file in mode 000, and sets size to 0.
1194 * setting size to 0 may fail for some specific file systems by the permission
1195 * checking which requires WRITE permission but the mode is 000.
1196 * we ignore the resizing(to 0) on the just new created file, since the size is
1197 * 0 after file created.
1199 * call this only after vfs_create() is called.
1202 nfsd_check_ignore_resizing(struct iattr *iap)
1204 if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
1205 iap->ia_valid &= ~ATTR_SIZE;
1209 * Create a file (regular, directory, device, fifo); UNIX sockets
1210 * not yet implemented.
1211 * If the response fh has been verified, the parent directory should
1212 * already be locked. Note that the parent directory is left locked.
1214 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1217 nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
1218 char *fname, int flen, struct iattr *iap,
1219 int type, dev_t rdev, struct svc_fh *resfhp)
1221 struct dentry *dentry, *dchild = NULL;
1231 if (isdotent(fname, flen))
1234 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1238 dentry = fhp->fh_dentry;
1239 dirp = dentry->d_inode;
1241 err = nfserr_notdir;
1242 if (!dirp->i_op->lookup)
1245 * Check whether the response file handle has been verified yet.
1246 * If it has, the parent directory should already be locked.
1248 if (!resfhp->fh_dentry) {
1249 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1250 fh_lock_nested(fhp, I_MUTEX_PARENT);
1251 dchild = lookup_one_len(fname, dentry, flen);
1252 host_err = PTR_ERR(dchild);
1255 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1259 /* called from nfsd_proc_create */
1260 dchild = dget(resfhp->fh_dentry);
1261 if (!fhp->fh_locked) {
1262 /* not actually possible */
1264 "nfsd_create: parent %s/%s not locked!\n",
1265 dentry->d_parent->d_name.name,
1266 dentry->d_name.name);
1272 * Make sure the child dentry is still negative ...
1275 if (dchild->d_inode) {
1276 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1277 dentry->d_name.name, dchild->d_name.name);
1281 if (!(iap->ia_valid & ATTR_MODE))
1283 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1286 if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) {
1287 printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
1292 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1297 * Get the dir op function pointer.
1302 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1304 nfsd_check_ignore_resizing(iap);
1307 host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1313 host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1317 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1321 if (EX_ISSYNC(fhp->fh_export)) {
1322 err = nfserrno(nfsd_sync_dir(dentry));
1323 write_inode_now(dchild->d_inode, 1);
1326 err2 = nfsd_create_setattr(rqstp, resfhp, iap);
1329 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1331 * Update the file handle to get the new inode info.
1334 err = fh_update(resfhp);
1336 if (dchild && !IS_ERR(dchild))
1341 err = nfserrno(host_err);
1345 #ifdef CONFIG_NFSD_V3
1347 * NFSv3 version of nfsd_create
1350 nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1351 char *fname, int flen, struct iattr *iap,
1352 struct svc_fh *resfhp, int createmode, u32 *verifier,
1353 int *truncp, int *created)
1355 struct dentry *dentry, *dchild = NULL;
1360 __u32 v_mtime=0, v_atime=0;
1366 if (isdotent(fname, flen))
1368 if (!(iap->ia_valid & ATTR_MODE))
1370 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1374 dentry = fhp->fh_dentry;
1375 dirp = dentry->d_inode;
1377 /* Get all the sanity checks out of the way before
1378 * we lock the parent. */
1379 err = nfserr_notdir;
1380 if (!dirp->i_op->lookup)
1382 fh_lock_nested(fhp, I_MUTEX_PARENT);
1385 * Compose the response file handle.
1387 dchild = lookup_one_len(fname, dentry, flen);
1388 host_err = PTR_ERR(dchild);
1392 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1396 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1397 /* solaris7 gets confused (bugid 4218508) if these have
1398 * the high bit set, so just clear the high bits. If this is
1399 * ever changed to use different attrs for storing the
1400 * verifier, then do_open_lookup() will also need to be fixed
1403 v_mtime = verifier[0]&0x7fffffff;
1404 v_atime = verifier[1]&0x7fffffff;
1407 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1410 if (dchild->d_inode) {
1413 switch (createmode) {
1414 case NFS3_CREATE_UNCHECKED:
1415 if (! S_ISREG(dchild->d_inode->i_mode))
1418 /* in nfsv4, we need to treat this case a little
1419 * differently. we don't want to truncate the
1420 * file now; this would be wrong if the OPEN
1421 * fails for some other reason. furthermore,
1422 * if the size is nonzero, we should ignore it
1423 * according to spec!
1425 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1428 iap->ia_valid &= ATTR_SIZE;
1432 case NFS3_CREATE_EXCLUSIVE:
1433 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
1434 && dchild->d_inode->i_atime.tv_sec == v_atime
1435 && dchild->d_inode->i_size == 0 )
1438 case NFS3_CREATE_GUARDED:
1441 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1445 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1447 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1453 if (EX_ISSYNC(fhp->fh_export)) {
1454 err = nfserrno(nfsd_sync_dir(dentry));
1455 /* setattr will sync the child (or not) */
1458 nfsd_check_ignore_resizing(iap);
1460 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1461 /* Cram the verifier into atime/mtime */
1462 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1463 | ATTR_MTIME_SET|ATTR_ATIME_SET;
1464 /* XXX someone who knows this better please fix it for nsec */
1465 iap->ia_mtime.tv_sec = v_mtime;
1466 iap->ia_atime.tv_sec = v_atime;
1467 iap->ia_mtime.tv_nsec = 0;
1468 iap->ia_atime.tv_nsec = 0;
1472 err2 = nfsd_create_setattr(rqstp, resfhp, iap);
1476 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1478 * Update the filehandle to get the new inode info.
1481 err = fh_update(resfhp);
1485 if (dchild && !IS_ERR(dchild))
1490 err = nfserrno(host_err);
1493 #endif /* CONFIG_NFSD_V3 */
1496 * Read a symlink. On entry, *lenp must contain the maximum path length that
1497 * fits into the buffer. On return, it contains the true length.
1498 * N.B. After this call fhp needs an fh_put
1501 nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1503 struct dentry *dentry;
1504 struct inode *inode;
1509 err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP);
1513 dentry = fhp->fh_dentry;
1514 inode = dentry->d_inode;
1517 if (!inode->i_op->readlink)
1520 touch_atime(fhp->fh_export->ex_path.mnt, dentry);
1521 /* N.B. Why does this call need a get_fs()??
1522 * Remove the set_fs and watch the fireworks:-) --okir
1525 oldfs = get_fs(); set_fs(KERNEL_DS);
1526 host_err = inode->i_op->readlink(dentry, buf, *lenp);
1537 err = nfserrno(host_err);
1542 * Create a symlink and look up its inode
1543 * N.B. After this call _both_ fhp and resfhp need an fh_put
1546 nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1547 char *fname, int flen,
1548 char *path, int plen,
1549 struct svc_fh *resfhp,
1552 struct dentry *dentry, *dnew;
1560 if (isdotent(fname, flen))
1563 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1567 dentry = fhp->fh_dentry;
1568 dnew = lookup_one_len(fname, dentry, flen);
1569 host_err = PTR_ERR(dnew);
1573 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1577 if (unlikely(path[plen] != 0)) {
1578 char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1579 if (path_alloced == NULL)
1582 strncpy(path_alloced, path, plen);
1583 path_alloced[plen] = 0;
1584 host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced);
1585 kfree(path_alloced);
1588 host_err = vfs_symlink(dentry->d_inode, dnew, path);
1591 if (EX_ISSYNC(fhp->fh_export))
1592 host_err = nfsd_sync_dir(dentry);
1594 err = nfserrno(host_err);
1597 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1599 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1601 if (err==0) err = cerr;
1606 err = nfserrno(host_err);
1612 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1615 nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1616 char *name, int len, struct svc_fh *tfhp)
1618 struct dentry *ddir, *dnew, *dold;
1619 struct inode *dirp, *dest;
1623 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE);
1626 err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP);
1634 if (isdotent(name, len))
1637 fh_lock_nested(ffhp, I_MUTEX_PARENT);
1638 ddir = ffhp->fh_dentry;
1639 dirp = ddir->d_inode;
1641 dnew = lookup_one_len(name, ddir, len);
1642 host_err = PTR_ERR(dnew);
1646 dold = tfhp->fh_dentry;
1647 dest = dold->d_inode;
1649 host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt);
1651 err = nfserrno(host_err);
1654 host_err = vfs_link(dold, dirp, dnew);
1656 if (EX_ISSYNC(ffhp->fh_export)) {
1657 err = nfserrno(nfsd_sync_dir(ddir));
1658 write_inode_now(dest, 1);
1662 if (host_err == -EXDEV && rqstp->rq_vers == 2)
1665 err = nfserrno(host_err);
1667 mnt_drop_write(tfhp->fh_export->ex_path.mnt);
1676 err = nfserrno(host_err);
1682 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1685 nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1686 struct svc_fh *tfhp, char *tname, int tlen)
1688 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap;
1689 struct inode *fdir, *tdir;
1693 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE);
1696 err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE);
1700 fdentry = ffhp->fh_dentry;
1701 fdir = fdentry->d_inode;
1703 tdentry = tfhp->fh_dentry;
1704 tdir = tdentry->d_inode;
1706 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1707 if (ffhp->fh_export != tfhp->fh_export)
1711 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1714 /* cannot use fh_lock as we need deadlock protective ordering
1715 * so do it by hand */
1716 trap = lock_rename(tdentry, fdentry);
1717 ffhp->fh_locked = tfhp->fh_locked = 1;
1721 odentry = lookup_one_len(fname, fdentry, flen);
1722 host_err = PTR_ERR(odentry);
1723 if (IS_ERR(odentry))
1727 if (!odentry->d_inode)
1730 if (odentry == trap)
1733 ndentry = lookup_one_len(tname, tdentry, tlen);
1734 host_err = PTR_ERR(ndentry);
1735 if (IS_ERR(ndentry))
1737 host_err = -ENOTEMPTY;
1738 if (ndentry == trap)
1741 if (svc_msnfs(ffhp) &&
1742 ((atomic_read(&odentry->d_count) > 1)
1743 || (atomic_read(&ndentry->d_count) > 1))) {
1749 if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt)
1751 host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt);
1755 host_err = vfs_rename(fdir, odentry, tdir, ndentry);
1756 if (!host_err && EX_ISSYNC(tfhp->fh_export)) {
1757 host_err = nfsd_sync_dir(tdentry);
1759 host_err = nfsd_sync_dir(fdentry);
1762 mnt_drop_write(ffhp->fh_export->ex_path.mnt);
1769 err = nfserrno(host_err);
1771 /* we cannot reply on fh_unlock on the two filehandles,
1772 * as that would do the wrong thing if the two directories
1773 * were the same, so again we do it by hand
1775 fill_post_wcc(ffhp);
1776 fill_post_wcc(tfhp);
1777 unlock_rename(tdentry, fdentry);
1778 ffhp->fh_locked = tfhp->fh_locked = 0;
1785 * Unlink a file or directory
1786 * N.B. After this call fhp needs an fh_put
1789 nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1790 char *fname, int flen)
1792 struct dentry *dentry, *rdentry;
1798 if (!flen || isdotent(fname, flen))
1800 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE);
1804 fh_lock_nested(fhp, I_MUTEX_PARENT);
1805 dentry = fhp->fh_dentry;
1806 dirp = dentry->d_inode;
1808 rdentry = lookup_one_len(fname, dentry, flen);
1809 host_err = PTR_ERR(rdentry);
1810 if (IS_ERR(rdentry))
1813 if (!rdentry->d_inode) {
1820 type = rdentry->d_inode->i_mode & S_IFMT;
1822 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1826 if (type != S_IFDIR) { /* It's UNLINK */
1828 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1829 (atomic_read(&rdentry->d_count) > 1)) {
1833 host_err = vfs_unlink(dirp, rdentry);
1834 } else { /* It's RMDIR */
1835 host_err = vfs_rmdir(dirp, rdentry);
1842 if (EX_ISSYNC(fhp->fh_export))
1843 host_err = nfsd_sync_dir(dentry);
1846 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1848 err = nfserrno(host_err);
1854 * We do this buffering because we must not call back into the file
1855 * system's ->lookup() method from the filldir callback. That may well
1856 * deadlock a number of file systems.
1858 * This is based heavily on the implementation of same in XFS.
1860 struct buffered_dirent {
1864 unsigned int d_type;
1868 struct readdir_data {
1874 static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen,
1875 loff_t offset, u64 ino, unsigned int d_type)
1877 struct readdir_data *buf = __buf;
1878 struct buffered_dirent *de = (void *)(buf->dirent + buf->used);
1879 unsigned int reclen;
1881 reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64));
1882 if (buf->used + reclen > PAGE_SIZE) {
1887 de->namlen = namlen;
1888 de->offset = offset;
1890 de->d_type = d_type;
1891 memcpy(de->name, name, namlen);
1892 buf->used += reclen;
1897 static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func,
1898 struct readdir_cd *cdp, loff_t *offsetp)
1900 struct readdir_data buf;
1901 struct buffered_dirent *de;
1906 buf.dirent = (void *)__get_free_page(GFP_KERNEL);
1908 return nfserrno(-ENOMEM);
1913 struct inode *dir_inode = file->f_path.dentry->d_inode;
1914 unsigned int reclen;
1916 cdp->err = nfserr_eof; /* will be cleared on successful read */
1920 host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf);
1933 * Various filldir functions may end up calling back into
1934 * lookup_one_len() and the file system's ->lookup() method.
1935 * These expect i_mutex to be held, as it would within readdir.
1937 host_err = mutex_lock_killable(&dir_inode->i_mutex);
1941 de = (struct buffered_dirent *)buf.dirent;
1943 offset = de->offset;
1945 if (func(cdp, de->name, de->namlen, de->offset,
1946 de->ino, de->d_type))
1949 if (cdp->err != nfs_ok)
1952 reclen = ALIGN(sizeof(*de) + de->namlen,
1955 de = (struct buffered_dirent *)((char *)de + reclen);
1957 mutex_unlock(&dir_inode->i_mutex);
1958 if (size > 0) /* We bailed out early */
1961 offset = vfs_llseek(file, 0, SEEK_CUR);
1964 free_page((unsigned long)(buf.dirent));
1967 return nfserrno(host_err);
1974 * Read entries from a directory.
1975 * The NFSv3/4 verifier we ignore for now.
1978 nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
1979 struct readdir_cd *cdp, filldir_t func)
1983 loff_t offset = *offsetp;
1985 err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file);
1989 offset = vfs_llseek(file, offset, 0);
1991 err = nfserrno((int)offset);
1995 err = nfsd_buffered_readdir(file, func, cdp, offsetp);
1997 if (err == nfserr_eof || err == nfserr_toosmall)
1998 err = nfs_ok; /* can still be found in ->err */
2006 * Get file system stats
2007 * N.B. After this call fhp needs an fh_put
2010 nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access)
2012 __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access);
2013 if (!err && vfs_statfs(fhp->fh_dentry,stat))
2018 static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp)
2020 return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY;
2024 * Check for a user's access permissions to this inode.
2027 nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
2028 struct dentry *dentry, int acc)
2030 struct inode *inode = dentry->d_inode;
2034 if (acc == NFSD_MAY_NOP)
2037 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
2039 (acc & NFSD_MAY_READ)? " read" : "",
2040 (acc & NFSD_MAY_WRITE)? " write" : "",
2041 (acc & NFSD_MAY_EXEC)? " exec" : "",
2042 (acc & NFSD_MAY_SATTR)? " sattr" : "",
2043 (acc & NFSD_MAY_TRUNC)? " trunc" : "",
2044 (acc & NFSD_MAY_LOCK)? " lock" : "",
2045 (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "",
2047 IS_IMMUTABLE(inode)? " immut" : "",
2048 IS_APPEND(inode)? " append" : "",
2049 __mnt_is_readonly(exp->ex_path.mnt)? " ro" : "");
2050 dprintk(" owner %d/%d user %d/%d\n",
2051 inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid());
2054 /* Normally we reject any write/sattr etc access on a read-only file
2055 * system. But if it is IRIX doing check on write-access for a
2056 * device special file, we ignore rofs.
2058 if (!(acc & NFSD_MAY_LOCAL_ACCESS))
2059 if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) {
2060 if (exp_rdonly(rqstp, exp) ||
2061 __mnt_is_readonly(exp->ex_path.mnt))
2063 if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode))
2066 if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode))
2069 if (acc & NFSD_MAY_LOCK) {
2070 /* If we cannot rely on authentication in NLM requests,
2071 * just allow locks, otherwise require read permission, or
2074 if (exp->ex_flags & NFSEXP_NOAUTHNLM)
2077 acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE;
2080 * The file owner always gets access permission for accesses that
2081 * would normally be checked at open time. This is to make
2082 * file access work even when the client has done a fchmod(fd, 0).
2084 * However, `cp foo bar' should fail nevertheless when bar is
2085 * readonly. A sensible way to do this might be to reject all
2086 * attempts to truncate a read-only file, because a creat() call
2087 * always implies file truncation.
2088 * ... but this isn't really fair. A process may reasonably call
2089 * ftruncate on an open file descriptor on a file with perm 000.
2090 * We must trust the client to do permission checking - using "ACCESS"
2093 if ((acc & NFSD_MAY_OWNER_OVERRIDE) &&
2094 inode->i_uid == current_fsuid())
2097 /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */
2098 err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC));
2100 /* Allow read access to binaries even when mode 111 */
2101 if (err == -EACCES && S_ISREG(inode->i_mode) &&
2102 acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE))
2103 err = inode_permission(inode, MAY_EXEC);
2107 /* Do integrity (permission) checking now, but defer incrementing
2108 * IMA counts to the actual file open.
2110 path.mnt = exp->ex_path.mnt;
2111 path.dentry = dentry;
2112 err = ima_path_check(&path, acc & (MAY_READ | MAY_WRITE | MAY_EXEC),
2115 return err? nfserrno(err) : 0;
2119 nfsd_racache_shutdown(void)
2121 struct raparms *raparm, *last_raparm;
2124 dprintk("nfsd: freeing readahead buffers.\n");
2126 for (i = 0; i < RAPARM_HASH_SIZE; i++) {
2127 raparm = raparm_hash[i].pb_head;
2129 last_raparm = raparm;
2130 raparm = raparm->p_next;
2133 raparm_hash[i].pb_head = NULL;
2137 * Initialize readahead param cache
2140 nfsd_racache_init(int cache_size)
2145 struct raparms **raparm = NULL;
2148 if (raparm_hash[0].pb_head)
2150 nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE);
2153 cache_size = nperbucket * RAPARM_HASH_SIZE;
2155 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size);
2157 for (i = 0; i < RAPARM_HASH_SIZE; i++) {
2158 spin_lock_init(&raparm_hash[i].pb_lock);
2160 raparm = &raparm_hash[i].pb_head;
2161 for (j = 0; j < nperbucket; j++) {
2162 *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL);
2165 raparm = &(*raparm)->p_next;
2170 nfsdstats.ra_size = cache_size;
2174 dprintk("nfsd: kmalloc failed, freeing readahead buffers\n");
2175 nfsd_racache_shutdown();
2179 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
2181 nfsd_get_posix_acl(struct svc_fh *fhp, int type)
2183 struct inode *inode = fhp->fh_dentry->d_inode;
2187 struct posix_acl *acl;
2189 if (!IS_POSIXACL(inode))
2190 return ERR_PTR(-EOPNOTSUPP);
2193 case ACL_TYPE_ACCESS:
2194 name = POSIX_ACL_XATTR_ACCESS;
2196 case ACL_TYPE_DEFAULT:
2197 name = POSIX_ACL_XATTR_DEFAULT;
2200 return ERR_PTR(-EOPNOTSUPP);
2203 size = nfsd_getxattr(fhp->fh_dentry, name, &value);
2205 return ERR_PTR(size);
2207 acl = posix_acl_from_xattr(value, size);
2213 nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
2215 struct inode *inode = fhp->fh_dentry->d_inode;
2221 if (!IS_POSIXACL(inode) ||
2222 !inode->i_op->setxattr || !inode->i_op->removexattr)
2225 case ACL_TYPE_ACCESS:
2226 name = POSIX_ACL_XATTR_ACCESS;
2228 case ACL_TYPE_DEFAULT:
2229 name = POSIX_ACL_XATTR_DEFAULT;
2235 if (acl && acl->a_count) {
2236 size = posix_acl_xattr_size(acl->a_count);
2237 value = kmalloc(size, GFP_KERNEL);
2240 error = posix_acl_to_xattr(acl, value, size);
2247 error = mnt_want_write(fhp->fh_export->ex_path.mnt);
2251 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
2253 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
2256 error = vfs_removexattr(fhp->fh_dentry, name);
2257 if (error == -ENODATA)
2261 mnt_drop_write(fhp->fh_export->ex_path.mnt);
2267 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */