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 (d_mountpoint(path.dentry) && follow_down(&path))
111 exp2 = rqst_exp_get_by_name(rqstp, &path);
113 if (PTR_ERR(exp2) != -ENOENT)
118 if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) {
119 /* successfully crossed mount point */
121 * This is subtle: path.dentry is *not* on path.mnt
122 * at this point. The only reason we are safe is that
123 * original mnt is pinned down by exp, so we should
124 * put path *before* putting exp
127 path.dentry = dentry;
138 nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
139 const char *name, unsigned int len,
140 struct svc_export **exp_ret, struct dentry **dentry_ret)
142 struct svc_export *exp;
143 struct dentry *dparent;
144 struct dentry *dentry;
148 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
150 /* Obtain dentry and export. */
151 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
155 dparent = fhp->fh_dentry;
156 exp = fhp->fh_export;
159 /* Lookup the name, but don't follow links */
160 if (isdotent(name, len)) {
162 dentry = dget(dparent);
163 else if (dparent != exp->ex_path.dentry)
164 dentry = dget_parent(dparent);
165 else if (!EX_NOHIDE(exp))
166 dentry = dget(dparent); /* .. == . just like at / */
168 /* checking mountpoint crossing is very different when stepping up */
169 struct svc_export *exp2 = NULL;
171 struct path path = {.mnt = mntget(exp->ex_path.mnt),
172 .dentry = dget(dparent)};
174 while (path.dentry == path.mnt->mnt_root &&
177 dp = dget_parent(path.dentry);
181 exp2 = rqst_exp_parent(rqstp, &path);
182 if (PTR_ERR(exp2) == -ENOENT) {
183 dentry = dget(dparent);
184 } else if (IS_ERR(exp2)) {
185 host_err = PTR_ERR(exp2);
189 dentry = dget(path.dentry);
197 dentry = lookup_one_len(name, dparent, len);
198 host_err = PTR_ERR(dentry);
202 * check if we have crossed a mount point ...
204 if (d_mountpoint(dentry)) {
205 if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
211 *dentry_ret = dentry;
217 return nfserrno(host_err);
221 * Look up one component of a pathname.
222 * N.B. After this call _both_ fhp and resfh need an fh_put
224 * If the lookup would cross a mountpoint, and the mounted filesystem
225 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
226 * accepted as it stands and the mounted directory is
227 * returned. Otherwise the covered directory is returned.
228 * NOTE: this mountpoint crossing is not supported properly by all
229 * clients and is explicitly disallowed for NFSv3
230 * NeilBrown <neilb@cse.unsw.edu.au>
233 nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
234 unsigned int len, struct svc_fh *resfh)
236 struct svc_export *exp;
237 struct dentry *dentry;
240 err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry);
243 err = check_nfsd_access(exp, rqstp);
247 * Note: we compose the file handle now, but as the
248 * dentry may be negative, it may need to be updated.
250 err = fh_compose(resfh, exp, dentry, fhp);
251 if (!err && !dentry->d_inode)
261 * Set various file attributes.
262 * N.B. After this call fhp needs an fh_put
265 nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
266 int check_guard, time_t guardtime)
268 struct dentry *dentry;
270 int accmode = NFSD_MAY_SATTR;
276 if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
277 accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE;
278 if (iap->ia_valid & ATTR_SIZE)
282 err = fh_verify(rqstp, fhp, ftype, accmode);
286 dentry = fhp->fh_dentry;
287 inode = dentry->d_inode;
289 /* Ignore any mode updates on symlinks */
290 if (S_ISLNK(inode->i_mode))
291 iap->ia_valid &= ~ATTR_MODE;
297 * NFSv2 does not differentiate between "set-[ac]time-to-now"
298 * which only requires access, and "set-[ac]time-to-X" which
299 * requires ownership.
300 * So if it looks like it might be "set both to the same time which
301 * is close to now", and if inode_change_ok fails, then we
302 * convert to "set to now" instead of "set to explicit time"
304 * We only call inode_change_ok as the last test as technically
305 * it is not an interface that we should be using. It is only
306 * valid if the filesystem does not define it's own i_op->setattr.
308 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
309 #define MAX_TOUCH_TIME_ERROR (30*60)
310 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
311 iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
315 * Now just make sure time is in the right ballpark.
316 * Solaris, at least, doesn't seem to care what the time
317 * request is. We require it be within 30 minutes of now.
319 time_t delta = iap->ia_atime.tv_sec - get_seconds();
322 if (delta < MAX_TOUCH_TIME_ERROR &&
323 inode_change_ok(inode, iap) != 0) {
325 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
326 * This will cause notify_change to set these times
329 iap->ia_valid &= ~BOTH_TIME_SET;
334 * The size case is special.
335 * It changes the file as well as the attributes.
337 if (iap->ia_valid & ATTR_SIZE) {
338 if (iap->ia_size < inode->i_size) {
339 err = nfsd_permission(rqstp, fhp->fh_export, dentry,
340 NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE);
346 * If we are changing the size of the file, then
347 * we need to break all leases.
349 host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
350 if (host_err == -EWOULDBLOCK)
351 host_err = -ETIMEDOUT;
352 if (host_err) /* ENOMEM or EWOULDBLOCK */
355 host_err = get_write_access(inode);
360 host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
362 put_write_access(inode);
368 /* sanitize the mode change */
369 if (iap->ia_valid & ATTR_MODE) {
370 iap->ia_mode &= S_IALLUGO;
371 iap->ia_mode |= (inode->i_mode & ~S_IALLUGO);
374 /* Revoke setuid/setgid on chown */
375 if (!S_ISDIR(inode->i_mode) &&
376 (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) ||
377 ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) {
378 iap->ia_valid |= ATTR_KILL_PRIV;
379 if (iap->ia_valid & ATTR_MODE) {
380 /* we're setting mode too, just clear the s*id bits */
381 iap->ia_mode &= ~S_ISUID;
382 if (iap->ia_mode & S_IXGRP)
383 iap->ia_mode &= ~S_ISGID;
385 /* set ATTR_KILL_* bits and let VFS handle it */
386 iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID);
390 /* Change the attributes. */
392 iap->ia_valid |= ATTR_CTIME;
394 err = nfserr_notsync;
395 if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
397 host_err = notify_change(dentry, iap);
398 err = nfserrno(host_err);
402 put_write_access(inode);
404 if (EX_ISSYNC(fhp->fh_export))
405 write_inode_now(inode, 1);
410 err = nfserrno(host_err);
414 #if defined(CONFIG_NFSD_V2_ACL) || \
415 defined(CONFIG_NFSD_V3_ACL) || \
416 defined(CONFIG_NFSD_V4)
417 static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
422 buflen = vfs_getxattr(dentry, key, NULL, 0);
426 *buf = kmalloc(buflen, GFP_KERNEL);
430 ret = vfs_getxattr(dentry, key, *buf, buflen);
437 #if defined(CONFIG_NFSD_V4)
439 set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
446 buflen = posix_acl_xattr_size(pacl->a_count);
447 buf = kmalloc(buflen, GFP_KERNEL);
452 len = posix_acl_to_xattr(pacl, buf, buflen);
458 error = vfs_setxattr(dentry, key, buf, len, 0);
465 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
466 struct nfs4_acl *acl)
470 struct dentry *dentry;
472 struct posix_acl *pacl = NULL, *dpacl = NULL;
473 unsigned int flags = 0;
476 error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR);
480 dentry = fhp->fh_dentry;
481 inode = dentry->d_inode;
482 if (S_ISDIR(inode->i_mode))
483 flags = NFS4_ACL_DIR;
485 host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
486 if (host_error == -EINVAL) {
487 return nfserr_attrnotsupp;
488 } else if (host_error < 0)
491 host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
495 if (S_ISDIR(inode->i_mode))
496 host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
499 posix_acl_release(pacl);
500 posix_acl_release(dpacl);
502 if (host_error == -EOPNOTSUPP)
503 return nfserr_attrnotsupp;
505 return nfserrno(host_error);
508 static struct posix_acl *
509 _get_posix_acl(struct dentry *dentry, char *key)
512 struct posix_acl *pacl = NULL;
515 buflen = nfsd_getxattr(dentry, key, &buf);
519 return ERR_PTR(buflen);
521 pacl = posix_acl_from_xattr(buf, buflen);
527 nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
529 struct inode *inode = dentry->d_inode;
531 struct posix_acl *pacl = NULL, *dpacl = NULL;
532 unsigned int flags = 0;
534 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
535 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
536 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
538 error = PTR_ERR(pacl);
543 if (S_ISDIR(inode->i_mode)) {
544 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
545 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
547 else if (IS_ERR(dpacl)) {
548 error = PTR_ERR(dpacl);
552 flags = NFS4_ACL_DIR;
555 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
557 error = PTR_ERR(*acl);
561 posix_acl_release(pacl);
562 posix_acl_release(dpacl);
566 #endif /* defined(CONFIG_NFS_V4) */
568 #ifdef CONFIG_NFSD_V3
570 * Check server access rights to a file system object
576 static struct accessmap nfs3_regaccess[] = {
577 { NFS3_ACCESS_READ, NFSD_MAY_READ },
578 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
579 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
580 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE },
585 static struct accessmap nfs3_diraccess[] = {
586 { NFS3_ACCESS_READ, NFSD_MAY_READ },
587 { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC },
588 { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC},
589 { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE },
590 { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE },
595 static struct accessmap nfs3_anyaccess[] = {
596 /* Some clients - Solaris 2.6 at least, make an access call
597 * to the server to check for access for things like /dev/null
598 * (which really, the server doesn't care about). So
599 * We provide simple access checking for them, looking
600 * mainly at mode bits, and we make sure to ignore read-only
603 { NFS3_ACCESS_READ, NFSD_MAY_READ },
604 { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
605 { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
606 { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
612 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
614 struct accessmap *map;
615 struct svc_export *export;
616 struct dentry *dentry;
617 u32 query, result = 0, sresult = 0;
620 error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP);
624 export = fhp->fh_export;
625 dentry = fhp->fh_dentry;
627 if (S_ISREG(dentry->d_inode->i_mode))
628 map = nfs3_regaccess;
629 else if (S_ISDIR(dentry->d_inode->i_mode))
630 map = nfs3_diraccess;
632 map = nfs3_anyaccess;
636 for (; map->access; map++) {
637 if (map->access & query) {
640 sresult |= map->access;
642 err2 = nfsd_permission(rqstp, export, dentry, map->how);
645 result |= map->access;
648 /* the following error codes just mean the access was not allowed,
649 * rather than an error occurred */
653 /* simply don't "or" in the access bit. */
663 *supported = sresult;
668 #endif /* CONFIG_NFSD_V3 */
673 * Open an existing file or directory.
674 * The access argument indicates the type of open (read/write/lock)
675 * N.B. After this call fhp needs an fh_put
678 nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
679 int access, struct file **filp)
681 const struct cred *cred = current_cred();
682 struct dentry *dentry;
684 int flags = O_RDONLY|O_LARGEFILE;
689 * If we get here, then the client has already done an "open",
690 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
691 * in case a chmod has now revoked permission.
693 err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE);
697 dentry = fhp->fh_dentry;
698 inode = dentry->d_inode;
700 /* Disallow write access to files with the append-only bit set
701 * or any access when mandatory locking enabled
704 if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE))
707 * We must ignore files (but only files) which might have mandatory
708 * locks on them because there is no way to know if the accesser has
711 if (S_ISREG((inode)->i_mode) && mandatory_lock(inode))
718 * Check to see if there are any leases on this file.
719 * This may block while leases are broken.
721 host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? FMODE_WRITE : 0));
722 if (host_err == -EWOULDBLOCK)
723 host_err = -ETIMEDOUT;
724 if (host_err) /* NOMEM or WOULDBLOCK */
727 if (access & NFSD_MAY_WRITE) {
728 if (access & NFSD_MAY_READ)
729 flags = O_RDWR|O_LARGEFILE;
731 flags = O_WRONLY|O_LARGEFILE;
735 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt),
738 host_err = PTR_ERR(*filp);
740 ima_counts_get(*filp);
742 err = nfserrno(host_err);
751 nfsd_close(struct file *filp)
758 * As this calls fsync (not fdatasync) there is no need for a write_inode
761 static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
762 const struct file_operations *fop)
764 struct inode *inode = dp->d_inode;
765 int (*fsync) (struct file *, struct dentry *, int);
768 err = filemap_fdatawrite(inode->i_mapping);
769 if (err == 0 && fop && (fsync = fop->fsync))
770 err = fsync(filp, dp, 0);
772 err = filemap_fdatawait(inode->i_mapping);
778 nfsd_sync(struct file *filp)
781 struct inode *inode = filp->f_path.dentry->d_inode;
782 dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name);
783 mutex_lock(&inode->i_mutex);
784 err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op);
785 mutex_unlock(&inode->i_mutex);
791 nfsd_sync_dir(struct dentry *dp)
793 return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
797 * Obtain the readahead parameters for the file
798 * specified by (dev, ino).
801 static inline struct raparms *
802 nfsd_get_raparms(dev_t dev, ino_t ino)
804 struct raparms *ra, **rap, **frap = NULL;
807 struct raparm_hbucket *rab;
809 hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK;
810 rab = &raparm_hash[hash];
812 spin_lock(&rab->pb_lock);
813 for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) {
814 if (ra->p_ino == ino && ra->p_dev == dev)
817 if (ra->p_count == 0)
820 depth = nfsdstats.ra_size*11/10;
822 spin_unlock(&rab->pb_lock);
832 if (rap != &rab->pb_head) {
834 ra->p_next = rab->pb_head;
838 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
839 spin_unlock(&rab->pb_lock);
844 * Grab and keep cached pages associated with a file in the svc_rqst
845 * so that they can be passed to the network sendmsg/sendpage routines
846 * directly. They will be released after the sending has completed.
849 nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
850 struct splice_desc *sd)
852 struct svc_rqst *rqstp = sd->u.data;
853 struct page **pp = rqstp->rq_respages + rqstp->rq_resused;
854 struct page *page = buf->page;
858 ret = buf->ops->confirm(pipe, buf);
864 if (rqstp->rq_res.page_len == 0) {
869 rqstp->rq_res.page_base = buf->offset;
870 rqstp->rq_res.page_len = size;
871 } else if (page != pp[-1]) {
877 rqstp->rq_res.page_len += size;
879 rqstp->rq_res.page_len += size;
884 static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
885 struct splice_desc *sd)
887 return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
890 static inline int svc_msnfs(struct svc_fh *ffhp)
893 return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS);
900 nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
901 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
910 inode = file->f_path.dentry->d_inode;
912 if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count))
915 /* Get readahead parameters */
916 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
919 file->f_ra = ra->p_ra;
921 if (file->f_op->splice_read && rqstp->rq_splice_ok) {
922 struct splice_desc sd = {
929 rqstp->rq_resused = 1;
930 host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
934 host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
938 /* Write back readahead params */
940 struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
941 spin_lock(&rab->pb_lock);
942 ra->p_ra = file->f_ra;
945 spin_unlock(&rab->pb_lock);
949 nfsdstats.io_read += host_err;
952 fsnotify_access(file->f_path.dentry);
954 err = nfserrno(host_err);
959 static void kill_suid(struct dentry *dentry)
962 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
964 mutex_lock(&dentry->d_inode->i_mutex);
965 notify_change(dentry, &ia);
966 mutex_unlock(&dentry->d_inode->i_mutex);
970 * Gathered writes: If another process is currently writing to the file,
971 * there's a high chance this is another nfsd (triggered by a bulk write
972 * from a client's biod). Rather than syncing the file with each write
973 * request, we sleep for 10 msec.
975 * I don't know if this roughly approximates C. Juszak's idea of
976 * gathered writes, but it's a nice and simple solution (IMHO), and it
979 * Note: we do this only in the NFSv2 case, since v3 and higher have a
980 * better tool (separate unstable writes and commits) for solving this
983 static int wait_for_concurrent_writes(struct file *file)
985 struct inode *inode = file->f_path.dentry->d_inode;
986 static ino_t last_ino;
987 static dev_t last_dev;
990 if (atomic_read(&inode->i_writecount) > 1
991 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
992 dprintk("nfsd: write defer %d\n", task_pid_nr(current));
994 dprintk("nfsd: write resume %d\n", task_pid_nr(current));
997 if (inode->i_state & I_DIRTY) {
998 dprintk("nfsd: write sync %d\n", task_pid_nr(current));
999 err = nfsd_sync(file);
1001 last_ino = inode->i_ino;
1002 last_dev = inode->i_sb->s_dev;
1007 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1008 loff_t offset, struct kvec *vec, int vlen,
1009 unsigned long *cnt, int *stablep)
1011 struct svc_export *exp;
1012 struct dentry *dentry;
1013 struct inode *inode;
1017 int stable = *stablep;
1023 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1024 (!lock_may_write(file->f_path.dentry->d_inode, offset, *cnt)))
1028 dentry = file->f_path.dentry;
1029 inode = dentry->d_inode;
1030 exp = fhp->fh_export;
1033 * Request sync writes if
1034 * - the sync export option has been set, or
1035 * - the client requested O_SYNC behavior (NFSv3 feature).
1036 * - The file system doesn't support fsync().
1037 * When NFSv2 gathered writes have been configured for this volume,
1038 * flushing the data to disk is handled separately below.
1040 use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp);
1042 if (!file->f_op->fsync) {/* COMMIT3 cannot work */
1044 *stablep = 2; /* FILE_SYNC */
1047 if (!EX_ISSYNC(exp))
1049 if (stable && !use_wgather) {
1050 spin_lock(&file->f_lock);
1051 file->f_flags |= O_SYNC;
1052 spin_unlock(&file->f_lock);
1055 /* Write the data. */
1056 oldfs = get_fs(); set_fs(KERNEL_DS);
1057 host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
1062 nfsdstats.io_write += host_err;
1063 fsnotify_modify(file->f_path.dentry);
1065 /* clear setuid/setgid flag after write */
1066 if (inode->i_mode & (S_ISUID | S_ISGID))
1069 if (stable && use_wgather)
1070 host_err = wait_for_concurrent_writes(file);
1073 dprintk("nfsd: write complete host_err=%d\n", host_err);
1077 err = nfserrno(host_err);
1083 * Read data from a file. count must contain the requested read count
1084 * on entry. On return, *count contains the number of bytes actually read.
1085 * N.B. After this call fhp needs an fh_put
1088 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1089 loff_t offset, struct kvec *vec, int vlen,
1090 unsigned long *count)
1095 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
1096 NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
1099 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1101 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
1104 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1112 * Write data to a file.
1113 * The stable flag requests synchronous writes.
1114 * N.B. After this call fhp needs an fh_put
1117 nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1118 loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt,
1124 err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
1125 NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE);
1128 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
1131 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
1136 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
1144 #ifdef CONFIG_NFSD_V3
1146 * Commit all pending writes to stable storage.
1147 * Strictly speaking, we could sync just the indicated file region here,
1148 * but there's currently no way we can ask the VFS to do so.
1150 * Unfortunately we cannot lock the file to make sure we return full WCC
1151 * data to the client, as locking happens lower down in the filesystem.
1154 nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
1155 loff_t offset, unsigned long count)
1160 if ((u64)count > ~(u64)offset)
1161 return nfserr_inval;
1163 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
1166 if (EX_ISSYNC(fhp->fh_export)) {
1167 if (file->f_op && file->f_op->fsync) {
1168 err = nfserrno(nfsd_sync(file));
1170 err = nfserr_notsupp;
1177 #endif /* CONFIG_NFSD_V3 */
1180 nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp,
1184 * Mode has already been set earlier in create:
1186 iap->ia_valid &= ~ATTR_MODE;
1188 * Setting uid/gid works only for root. Irix appears to
1189 * send along the gid on create when it tries to implement
1190 * setgid directories via NFS:
1192 if (current_fsuid() != 0)
1193 iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
1195 return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1199 /* HPUX client sometimes creates a file in mode 000, and sets size to 0.
1200 * setting size to 0 may fail for some specific file systems by the permission
1201 * checking which requires WRITE permission but the mode is 000.
1202 * we ignore the resizing(to 0) on the just new created file, since the size is
1203 * 0 after file created.
1205 * call this only after vfs_create() is called.
1208 nfsd_check_ignore_resizing(struct iattr *iap)
1210 if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
1211 iap->ia_valid &= ~ATTR_SIZE;
1215 * Create a file (regular, directory, device, fifo); UNIX sockets
1216 * not yet implemented.
1217 * If the response fh has been verified, the parent directory should
1218 * already be locked. Note that the parent directory is left locked.
1220 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1223 nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
1224 char *fname, int flen, struct iattr *iap,
1225 int type, dev_t rdev, struct svc_fh *resfhp)
1227 struct dentry *dentry, *dchild = NULL;
1237 if (isdotent(fname, flen))
1240 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1244 dentry = fhp->fh_dentry;
1245 dirp = dentry->d_inode;
1247 err = nfserr_notdir;
1248 if (!dirp->i_op->lookup)
1251 * Check whether the response file handle has been verified yet.
1252 * If it has, the parent directory should already be locked.
1254 if (!resfhp->fh_dentry) {
1255 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1256 fh_lock_nested(fhp, I_MUTEX_PARENT);
1257 dchild = lookup_one_len(fname, dentry, flen);
1258 host_err = PTR_ERR(dchild);
1261 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1265 /* called from nfsd_proc_create */
1266 dchild = dget(resfhp->fh_dentry);
1267 if (!fhp->fh_locked) {
1268 /* not actually possible */
1270 "nfsd_create: parent %s/%s not locked!\n",
1271 dentry->d_parent->d_name.name,
1272 dentry->d_name.name);
1278 * Make sure the child dentry is still negative ...
1281 if (dchild->d_inode) {
1282 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1283 dentry->d_name.name, dchild->d_name.name);
1287 if (!(iap->ia_valid & ATTR_MODE))
1289 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1292 if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) {
1293 printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
1298 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1303 * Get the dir op function pointer.
1308 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1310 nfsd_check_ignore_resizing(iap);
1313 host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1319 host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1323 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1327 if (EX_ISSYNC(fhp->fh_export)) {
1328 err = nfserrno(nfsd_sync_dir(dentry));
1329 write_inode_now(dchild->d_inode, 1);
1332 err2 = nfsd_create_setattr(rqstp, resfhp, iap);
1335 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1337 * Update the file handle to get the new inode info.
1340 err = fh_update(resfhp);
1342 if (dchild && !IS_ERR(dchild))
1347 err = nfserrno(host_err);
1351 #ifdef CONFIG_NFSD_V3
1353 * NFSv3 version of nfsd_create
1356 nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1357 char *fname, int flen, struct iattr *iap,
1358 struct svc_fh *resfhp, int createmode, u32 *verifier,
1359 int *truncp, int *created)
1361 struct dentry *dentry, *dchild = NULL;
1366 __u32 v_mtime=0, v_atime=0;
1372 if (isdotent(fname, flen))
1374 if (!(iap->ia_valid & ATTR_MODE))
1376 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1380 dentry = fhp->fh_dentry;
1381 dirp = dentry->d_inode;
1383 /* Get all the sanity checks out of the way before
1384 * we lock the parent. */
1385 err = nfserr_notdir;
1386 if (!dirp->i_op->lookup)
1388 fh_lock_nested(fhp, I_MUTEX_PARENT);
1391 * Compose the response file handle.
1393 dchild = lookup_one_len(fname, dentry, flen);
1394 host_err = PTR_ERR(dchild);
1398 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1402 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1403 /* solaris7 gets confused (bugid 4218508) if these have
1404 * the high bit set, so just clear the high bits. If this is
1405 * ever changed to use different attrs for storing the
1406 * verifier, then do_open_lookup() will also need to be fixed
1409 v_mtime = verifier[0]&0x7fffffff;
1410 v_atime = verifier[1]&0x7fffffff;
1413 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1416 if (dchild->d_inode) {
1419 switch (createmode) {
1420 case NFS3_CREATE_UNCHECKED:
1421 if (! S_ISREG(dchild->d_inode->i_mode))
1424 /* in nfsv4, we need to treat this case a little
1425 * differently. we don't want to truncate the
1426 * file now; this would be wrong if the OPEN
1427 * fails for some other reason. furthermore,
1428 * if the size is nonzero, we should ignore it
1429 * according to spec!
1431 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1434 iap->ia_valid &= ATTR_SIZE;
1438 case NFS3_CREATE_EXCLUSIVE:
1439 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
1440 && dchild->d_inode->i_atime.tv_sec == v_atime
1441 && dchild->d_inode->i_size == 0 )
1444 case NFS3_CREATE_GUARDED:
1447 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1451 host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1453 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1459 if (EX_ISSYNC(fhp->fh_export)) {
1460 err = nfserrno(nfsd_sync_dir(dentry));
1461 /* setattr will sync the child (or not) */
1464 nfsd_check_ignore_resizing(iap);
1466 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1467 /* Cram the verifier into atime/mtime */
1468 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1469 | ATTR_MTIME_SET|ATTR_ATIME_SET;
1470 /* XXX someone who knows this better please fix it for nsec */
1471 iap->ia_mtime.tv_sec = v_mtime;
1472 iap->ia_atime.tv_sec = v_atime;
1473 iap->ia_mtime.tv_nsec = 0;
1474 iap->ia_atime.tv_nsec = 0;
1478 err2 = nfsd_create_setattr(rqstp, resfhp, iap);
1482 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1484 * Update the filehandle to get the new inode info.
1487 err = fh_update(resfhp);
1491 if (dchild && !IS_ERR(dchild))
1496 err = nfserrno(host_err);
1499 #endif /* CONFIG_NFSD_V3 */
1502 * Read a symlink. On entry, *lenp must contain the maximum path length that
1503 * fits into the buffer. On return, it contains the true length.
1504 * N.B. After this call fhp needs an fh_put
1507 nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1509 struct dentry *dentry;
1510 struct inode *inode;
1515 err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP);
1519 dentry = fhp->fh_dentry;
1520 inode = dentry->d_inode;
1523 if (!inode->i_op->readlink)
1526 touch_atime(fhp->fh_export->ex_path.mnt, dentry);
1527 /* N.B. Why does this call need a get_fs()??
1528 * Remove the set_fs and watch the fireworks:-) --okir
1531 oldfs = get_fs(); set_fs(KERNEL_DS);
1532 host_err = inode->i_op->readlink(dentry, buf, *lenp);
1543 err = nfserrno(host_err);
1548 * Create a symlink and look up its inode
1549 * N.B. After this call _both_ fhp and resfhp need an fh_put
1552 nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1553 char *fname, int flen,
1554 char *path, int plen,
1555 struct svc_fh *resfhp,
1558 struct dentry *dentry, *dnew;
1566 if (isdotent(fname, flen))
1569 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
1573 dentry = fhp->fh_dentry;
1574 dnew = lookup_one_len(fname, dentry, flen);
1575 host_err = PTR_ERR(dnew);
1579 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1583 if (unlikely(path[plen] != 0)) {
1584 char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1585 if (path_alloced == NULL)
1588 strncpy(path_alloced, path, plen);
1589 path_alloced[plen] = 0;
1590 host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced);
1591 kfree(path_alloced);
1594 host_err = vfs_symlink(dentry->d_inode, dnew, path);
1597 if (EX_ISSYNC(fhp->fh_export))
1598 host_err = nfsd_sync_dir(dentry);
1600 err = nfserrno(host_err);
1603 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1605 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1607 if (err==0) err = cerr;
1612 err = nfserrno(host_err);
1618 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1621 nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1622 char *name, int len, struct svc_fh *tfhp)
1624 struct dentry *ddir, *dnew, *dold;
1625 struct inode *dirp, *dest;
1629 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE);
1632 err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP);
1640 if (isdotent(name, len))
1643 fh_lock_nested(ffhp, I_MUTEX_PARENT);
1644 ddir = ffhp->fh_dentry;
1645 dirp = ddir->d_inode;
1647 dnew = lookup_one_len(name, ddir, len);
1648 host_err = PTR_ERR(dnew);
1652 dold = tfhp->fh_dentry;
1653 dest = dold->d_inode;
1655 host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt);
1657 err = nfserrno(host_err);
1660 host_err = vfs_link(dold, dirp, dnew);
1662 if (EX_ISSYNC(ffhp->fh_export)) {
1663 err = nfserrno(nfsd_sync_dir(ddir));
1664 write_inode_now(dest, 1);
1668 if (host_err == -EXDEV && rqstp->rq_vers == 2)
1671 err = nfserrno(host_err);
1673 mnt_drop_write(tfhp->fh_export->ex_path.mnt);
1682 err = nfserrno(host_err);
1688 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1691 nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1692 struct svc_fh *tfhp, char *tname, int tlen)
1694 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap;
1695 struct inode *fdir, *tdir;
1699 err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE);
1702 err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE);
1706 fdentry = ffhp->fh_dentry;
1707 fdir = fdentry->d_inode;
1709 tdentry = tfhp->fh_dentry;
1710 tdir = tdentry->d_inode;
1712 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1713 if (ffhp->fh_export != tfhp->fh_export)
1717 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1720 /* cannot use fh_lock as we need deadlock protective ordering
1721 * so do it by hand */
1722 trap = lock_rename(tdentry, fdentry);
1723 ffhp->fh_locked = tfhp->fh_locked = 1;
1727 odentry = lookup_one_len(fname, fdentry, flen);
1728 host_err = PTR_ERR(odentry);
1729 if (IS_ERR(odentry))
1733 if (!odentry->d_inode)
1736 if (odentry == trap)
1739 ndentry = lookup_one_len(tname, tdentry, tlen);
1740 host_err = PTR_ERR(ndentry);
1741 if (IS_ERR(ndentry))
1743 host_err = -ENOTEMPTY;
1744 if (ndentry == trap)
1747 if (svc_msnfs(ffhp) &&
1748 ((atomic_read(&odentry->d_count) > 1)
1749 || (atomic_read(&ndentry->d_count) > 1))) {
1755 if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt)
1757 host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt);
1761 host_err = vfs_rename(fdir, odentry, tdir, ndentry);
1762 if (!host_err && EX_ISSYNC(tfhp->fh_export)) {
1763 host_err = nfsd_sync_dir(tdentry);
1765 host_err = nfsd_sync_dir(fdentry);
1768 mnt_drop_write(ffhp->fh_export->ex_path.mnt);
1775 err = nfserrno(host_err);
1777 /* we cannot reply on fh_unlock on the two filehandles,
1778 * as that would do the wrong thing if the two directories
1779 * were the same, so again we do it by hand
1781 fill_post_wcc(ffhp);
1782 fill_post_wcc(tfhp);
1783 unlock_rename(tdentry, fdentry);
1784 ffhp->fh_locked = tfhp->fh_locked = 0;
1791 * Unlink a file or directory
1792 * N.B. After this call fhp needs an fh_put
1795 nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1796 char *fname, int flen)
1798 struct dentry *dentry, *rdentry;
1804 if (!flen || isdotent(fname, flen))
1806 err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE);
1810 fh_lock_nested(fhp, I_MUTEX_PARENT);
1811 dentry = fhp->fh_dentry;
1812 dirp = dentry->d_inode;
1814 rdentry = lookup_one_len(fname, dentry, flen);
1815 host_err = PTR_ERR(rdentry);
1816 if (IS_ERR(rdentry))
1819 if (!rdentry->d_inode) {
1826 type = rdentry->d_inode->i_mode & S_IFMT;
1828 host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
1832 if (type != S_IFDIR) { /* It's UNLINK */
1834 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1835 (atomic_read(&rdentry->d_count) > 1)) {
1839 host_err = vfs_unlink(dirp, rdentry);
1840 } else { /* It's RMDIR */
1841 host_err = vfs_rmdir(dirp, rdentry);
1848 if (EX_ISSYNC(fhp->fh_export))
1849 host_err = nfsd_sync_dir(dentry);
1852 mnt_drop_write(fhp->fh_export->ex_path.mnt);
1854 err = nfserrno(host_err);
1860 * We do this buffering because we must not call back into the file
1861 * system's ->lookup() method from the filldir callback. That may well
1862 * deadlock a number of file systems.
1864 * This is based heavily on the implementation of same in XFS.
1866 struct buffered_dirent {
1870 unsigned int d_type;
1874 struct readdir_data {
1880 static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen,
1881 loff_t offset, u64 ino, unsigned int d_type)
1883 struct readdir_data *buf = __buf;
1884 struct buffered_dirent *de = (void *)(buf->dirent + buf->used);
1885 unsigned int reclen;
1887 reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64));
1888 if (buf->used + reclen > PAGE_SIZE) {
1893 de->namlen = namlen;
1894 de->offset = offset;
1896 de->d_type = d_type;
1897 memcpy(de->name, name, namlen);
1898 buf->used += reclen;
1903 static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func,
1904 struct readdir_cd *cdp, loff_t *offsetp)
1906 struct readdir_data buf;
1907 struct buffered_dirent *de;
1912 buf.dirent = (void *)__get_free_page(GFP_KERNEL);
1914 return nfserrno(-ENOMEM);
1919 struct inode *dir_inode = file->f_path.dentry->d_inode;
1920 unsigned int reclen;
1922 cdp->err = nfserr_eof; /* will be cleared on successful read */
1926 host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf);
1939 * Various filldir functions may end up calling back into
1940 * lookup_one_len() and the file system's ->lookup() method.
1941 * These expect i_mutex to be held, as it would within readdir.
1943 host_err = mutex_lock_killable(&dir_inode->i_mutex);
1947 de = (struct buffered_dirent *)buf.dirent;
1949 offset = de->offset;
1951 if (func(cdp, de->name, de->namlen, de->offset,
1952 de->ino, de->d_type))
1955 if (cdp->err != nfs_ok)
1958 reclen = ALIGN(sizeof(*de) + de->namlen,
1961 de = (struct buffered_dirent *)((char *)de + reclen);
1963 mutex_unlock(&dir_inode->i_mutex);
1964 if (size > 0) /* We bailed out early */
1967 offset = vfs_llseek(file, 0, SEEK_CUR);
1970 free_page((unsigned long)(buf.dirent));
1973 return nfserrno(host_err);
1980 * Read entries from a directory.
1981 * The NFSv3/4 verifier we ignore for now.
1984 nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
1985 struct readdir_cd *cdp, filldir_t func)
1989 loff_t offset = *offsetp;
1991 err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file);
1995 offset = vfs_llseek(file, offset, 0);
1997 err = nfserrno((int)offset);
2001 err = nfsd_buffered_readdir(file, func, cdp, offsetp);
2003 if (err == nfserr_eof || err == nfserr_toosmall)
2004 err = nfs_ok; /* can still be found in ->err */
2012 * Get file system stats
2013 * N.B. After this call fhp needs an fh_put
2016 nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access)
2018 __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access);
2019 if (!err && vfs_statfs(fhp->fh_dentry,stat))
2024 static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp)
2026 return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY;
2030 * Check for a user's access permissions to this inode.
2033 nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
2034 struct dentry *dentry, int acc)
2036 struct inode *inode = dentry->d_inode;
2040 if (acc == NFSD_MAY_NOP)
2043 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
2045 (acc & NFSD_MAY_READ)? " read" : "",
2046 (acc & NFSD_MAY_WRITE)? " write" : "",
2047 (acc & NFSD_MAY_EXEC)? " exec" : "",
2048 (acc & NFSD_MAY_SATTR)? " sattr" : "",
2049 (acc & NFSD_MAY_TRUNC)? " trunc" : "",
2050 (acc & NFSD_MAY_LOCK)? " lock" : "",
2051 (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "",
2053 IS_IMMUTABLE(inode)? " immut" : "",
2054 IS_APPEND(inode)? " append" : "",
2055 __mnt_is_readonly(exp->ex_path.mnt)? " ro" : "");
2056 dprintk(" owner %d/%d user %d/%d\n",
2057 inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid());
2060 /* Normally we reject any write/sattr etc access on a read-only file
2061 * system. But if it is IRIX doing check on write-access for a
2062 * device special file, we ignore rofs.
2064 if (!(acc & NFSD_MAY_LOCAL_ACCESS))
2065 if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) {
2066 if (exp_rdonly(rqstp, exp) ||
2067 __mnt_is_readonly(exp->ex_path.mnt))
2069 if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode))
2072 if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode))
2075 if (acc & NFSD_MAY_LOCK) {
2076 /* If we cannot rely on authentication in NLM requests,
2077 * just allow locks, otherwise require read permission, or
2080 if (exp->ex_flags & NFSEXP_NOAUTHNLM)
2083 acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE;
2086 * The file owner always gets access permission for accesses that
2087 * would normally be checked at open time. This is to make
2088 * file access work even when the client has done a fchmod(fd, 0).
2090 * However, `cp foo bar' should fail nevertheless when bar is
2091 * readonly. A sensible way to do this might be to reject all
2092 * attempts to truncate a read-only file, because a creat() call
2093 * always implies file truncation.
2094 * ... but this isn't really fair. A process may reasonably call
2095 * ftruncate on an open file descriptor on a file with perm 000.
2096 * We must trust the client to do permission checking - using "ACCESS"
2099 if ((acc & NFSD_MAY_OWNER_OVERRIDE) &&
2100 inode->i_uid == current_fsuid())
2103 /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */
2104 err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC));
2106 /* Allow read access to binaries even when mode 111 */
2107 if (err == -EACCES && S_ISREG(inode->i_mode) &&
2108 acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE))
2109 err = inode_permission(inode, MAY_EXEC);
2113 /* Do integrity (permission) checking now, but defer incrementing
2114 * IMA counts to the actual file open.
2116 path.mnt = exp->ex_path.mnt;
2117 path.dentry = dentry;
2118 err = ima_path_check(&path, acc & (MAY_READ | MAY_WRITE | MAY_EXEC),
2121 return err? nfserrno(err) : 0;
2125 nfsd_racache_shutdown(void)
2127 struct raparms *raparm, *last_raparm;
2130 dprintk("nfsd: freeing readahead buffers.\n");
2132 for (i = 0; i < RAPARM_HASH_SIZE; i++) {
2133 raparm = raparm_hash[i].pb_head;
2135 last_raparm = raparm;
2136 raparm = raparm->p_next;
2139 raparm_hash[i].pb_head = NULL;
2143 * Initialize readahead param cache
2146 nfsd_racache_init(int cache_size)
2151 struct raparms **raparm = NULL;
2154 if (raparm_hash[0].pb_head)
2156 nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE);
2159 cache_size = nperbucket * RAPARM_HASH_SIZE;
2161 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size);
2163 for (i = 0; i < RAPARM_HASH_SIZE; i++) {
2164 spin_lock_init(&raparm_hash[i].pb_lock);
2166 raparm = &raparm_hash[i].pb_head;
2167 for (j = 0; j < nperbucket; j++) {
2168 *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL);
2171 raparm = &(*raparm)->p_next;
2176 nfsdstats.ra_size = cache_size;
2180 dprintk("nfsd: kmalloc failed, freeing readahead buffers\n");
2181 nfsd_racache_shutdown();
2185 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
2187 nfsd_get_posix_acl(struct svc_fh *fhp, int type)
2189 struct inode *inode = fhp->fh_dentry->d_inode;
2193 struct posix_acl *acl;
2195 if (!IS_POSIXACL(inode))
2196 return ERR_PTR(-EOPNOTSUPP);
2199 case ACL_TYPE_ACCESS:
2200 name = POSIX_ACL_XATTR_ACCESS;
2202 case ACL_TYPE_DEFAULT:
2203 name = POSIX_ACL_XATTR_DEFAULT;
2206 return ERR_PTR(-EOPNOTSUPP);
2209 size = nfsd_getxattr(fhp->fh_dentry, name, &value);
2211 return ERR_PTR(size);
2213 acl = posix_acl_from_xattr(value, size);
2219 nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
2221 struct inode *inode = fhp->fh_dentry->d_inode;
2227 if (!IS_POSIXACL(inode) ||
2228 !inode->i_op->setxattr || !inode->i_op->removexattr)
2231 case ACL_TYPE_ACCESS:
2232 name = POSIX_ACL_XATTR_ACCESS;
2234 case ACL_TYPE_DEFAULT:
2235 name = POSIX_ACL_XATTR_DEFAULT;
2241 if (acl && acl->a_count) {
2242 size = posix_acl_xattr_size(acl->a_count);
2243 value = kmalloc(size, GFP_KERNEL);
2246 error = posix_acl_to_xattr(acl, value, size);
2253 error = mnt_want_write(fhp->fh_export->ex_path.mnt);
2257 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
2259 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
2262 error = vfs_removexattr(fhp->fh_dentry, name);
2263 if (error == -ENODATA)
2267 mnt_drop_write(fhp->fh_export->ex_path.mnt);
2273 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */