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/config.h>
20 #include <linux/string.h>
21 #include <linux/time.h>
22 #include <linux/errno.h>
24 #include <linux/file.h>
25 #include <linux/mount.h>
26 #include <linux/major.h>
27 #include <linux/ext2_fs.h>
28 #include <linux/proc_fs.h>
29 #include <linux/stat.h>
30 #include <linux/fcntl.h>
31 #include <linux/net.h>
32 #include <linux/unistd.h>
33 #include <linux/slab.h>
34 #include <linux/pagemap.h>
36 #include <linux/module.h>
37 #include <linux/namei.h>
38 #include <linux/vfs.h>
39 #include <linux/delay.h>
40 #include <linux/sunrpc/svc.h>
41 #include <linux/nfsd/nfsd.h>
43 #include <linux/nfs3.h>
44 #include <linux/nfsd/xdr3.h>
45 #endif /* CONFIG_NFSD_V3 */
46 #include <linux/nfsd/nfsfh.h>
47 #include <linux/quotaops.h>
48 #include <linux/fsnotify.h>
49 #include <linux/posix_acl.h>
50 #include <linux/posix_acl_xattr.h>
51 #include <linux/xattr.h>
53 #include <linux/nfs4.h>
54 #include <linux/nfs4_acl.h>
55 #include <linux/nfsd_idmap.h>
56 #include <linux/security.h>
57 #endif /* CONFIG_NFSD_V4 */
59 #include <asm/uaccess.h>
61 #define NFSDDBG_FACILITY NFSDDBG_FILEOP
65 /* We must ignore files (but only files) which might have mandatory
66 * locks on them because there is no way to know if the accesser has
69 #define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i))
72 * This is a cache of readahead params that help us choose the proper
73 * readahead strategy. Initially, we set all readahead parameters to 0
74 * and let the VFS handle things.
75 * If you increase the number of cached files very much, you'll need to
76 * add a hash table here.
79 struct raparms *p_next;
84 struct file_ra_state p_ra;
87 static struct raparms * raparml;
88 static struct raparms * raparm_cache;
91 * Called from nfsd_lookup and encode_dirent. Check if we have crossed
93 * Returns -EAGAIN leaving *dpp and *expp unchanged,
94 * or nfs_ok having possibly changed *dpp and *expp
97 nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
98 struct svc_export **expp)
100 struct svc_export *exp = *expp, *exp2 = NULL;
101 struct dentry *dentry = *dpp;
102 struct vfsmount *mnt = mntget(exp->ex_mnt);
103 struct dentry *mounts = dget(dentry);
106 while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts));
108 exp2 = exp_get_by_name(exp->ex_client, mnt, mounts, &rqstp->rq_chandle);
115 if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) {
116 /* successfully crossed mount point */
122 if (exp2) exp_put(exp2);
131 * Look up one component of a pathname.
132 * N.B. After this call _both_ fhp and resfh need an fh_put
134 * If the lookup would cross a mountpoint, and the mounted filesystem
135 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
136 * accepted as it stands and the mounted directory is
137 * returned. Otherwise the covered directory is returned.
138 * NOTE: this mountpoint crossing is not supported properly by all
139 * clients and is explicitly disallowed for NFSv3
140 * NeilBrown <neilb@cse.unsw.edu.au>
143 nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
144 int len, struct svc_fh *resfh)
146 struct svc_export *exp;
147 struct dentry *dparent;
148 struct dentry *dentry;
151 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
153 /* Obtain dentry and export. */
154 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
158 dparent = fhp->fh_dentry;
159 exp = fhp->fh_export;
164 /* Lookup the name, but don't follow links */
165 if (isdotent(name, len)) {
167 dentry = dget(dparent);
168 else if (dparent != exp->ex_dentry) {
169 dentry = dget_parent(dparent);
170 } else if (!EX_NOHIDE(exp))
171 dentry = dget(dparent); /* .. == . just like at / */
173 /* checking mountpoint crossing is very different when stepping up */
174 struct svc_export *exp2 = NULL;
176 struct vfsmount *mnt = mntget(exp->ex_mnt);
177 dentry = dget(dparent);
178 while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry))
180 dp = dget_parent(dentry);
184 exp2 = exp_parent(exp->ex_client, mnt, dentry,
194 dentry = dget(dparent);
203 dentry = lookup_one_len(name, dparent, len);
204 err = PTR_ERR(dentry);
208 * check if we have crossed a mount point ...
210 if (d_mountpoint(dentry)) {
211 if ((err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
218 * Note: we compose the file handle now, but as the
219 * dentry may be negative, it may need to be updated.
221 err = fh_compose(resfh, exp, dentry, fhp);
222 if (!err && !dentry->d_inode)
235 * Set various file attributes.
236 * N.B. After this call fhp needs an fh_put
239 nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
240 int check_guard, time_t guardtime)
242 struct dentry *dentry;
244 int accmode = MAY_SATTR;
250 if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
251 accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE;
252 if (iap->ia_valid & ATTR_SIZE)
256 err = fh_verify(rqstp, fhp, ftype, accmode);
260 dentry = fhp->fh_dentry;
261 inode = dentry->d_inode;
263 /* Ignore any mode updates on symlinks */
264 if (S_ISLNK(inode->i_mode))
265 iap->ia_valid &= ~ATTR_MODE;
270 /* NFSv2 does not differentiate between "set-[ac]time-to-now"
271 * which only requires access, and "set-[ac]time-to-X" which
272 * requires ownership.
273 * So if it looks like it might be "set both to the same time which
274 * is close to now", and if inode_change_ok fails, then we
275 * convert to "set to now" instead of "set to explicit time"
277 * We only call inode_change_ok as the last test as technically
278 * it is not an interface that we should be using. It is only
279 * valid if the filesystem does not define it's own i_op->setattr.
281 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
282 #define MAX_TOUCH_TIME_ERROR (30*60)
283 if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET
284 && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec
286 /* Looks probable. Now just make sure time is in the right ballpark.
287 * Solaris, at least, doesn't seem to care what the time request is.
288 * We require it be within 30 minutes of now.
290 time_t delta = iap->ia_atime.tv_sec - get_seconds();
291 if (delta<0) delta = -delta;
292 if (delta < MAX_TOUCH_TIME_ERROR &&
293 inode_change_ok(inode, iap) != 0) {
294 /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
295 * this will cause notify_change to set these times to "now"
297 iap->ia_valid &= ~BOTH_TIME_SET;
301 /* The size case is special. It changes the file as well as the attributes. */
302 if (iap->ia_valid & ATTR_SIZE) {
303 if (iap->ia_size < inode->i_size) {
304 err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
310 * If we are changing the size of the file, then
311 * we need to break all leases.
313 err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
314 if (err == -EWOULDBLOCK)
316 if (err) /* ENOMEM or EWOULDBLOCK */
319 err = get_write_access(inode);
324 err = locks_verify_truncate(inode, NULL, iap->ia_size);
326 put_write_access(inode);
332 imode = inode->i_mode;
333 if (iap->ia_valid & ATTR_MODE) {
334 iap->ia_mode &= S_IALLUGO;
335 imode = iap->ia_mode |= (imode & ~S_IALLUGO);
338 /* Revoke setuid/setgid bit on chown/chgrp */
339 if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid)
340 iap->ia_valid |= ATTR_KILL_SUID;
341 if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)
342 iap->ia_valid |= ATTR_KILL_SGID;
344 /* Change the attributes. */
346 iap->ia_valid |= ATTR_CTIME;
348 err = nfserr_notsync;
349 if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
351 err = notify_change(dentry, iap);
356 put_write_access(inode);
358 if (EX_ISSYNC(fhp->fh_export))
359 write_inode_now(inode, 1);
368 #if defined(CONFIG_NFSD_V2_ACL) || \
369 defined(CONFIG_NFSD_V3_ACL) || \
370 defined(CONFIG_NFSD_V4)
371 static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
375 buflen = vfs_getxattr(dentry, key, NULL, 0);
379 *buf = kmalloc(buflen, GFP_KERNEL);
383 return vfs_getxattr(dentry, key, *buf, buflen);
387 #if defined(CONFIG_NFSD_V4)
389 set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
396 buflen = posix_acl_xattr_size(pacl->a_count);
397 buf = kmalloc(buflen, GFP_KERNEL);
402 len = posix_acl_to_xattr(pacl, buf, buflen);
408 error = vfs_setxattr(dentry, key, buf, len, 0);
415 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
416 struct nfs4_acl *acl)
419 struct dentry *dentry;
421 struct posix_acl *pacl = NULL, *dpacl = NULL;
422 unsigned int flags = 0;
425 error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR);
429 dentry = fhp->fh_dentry;
430 inode = dentry->d_inode;
431 if (S_ISDIR(inode->i_mode))
432 flags = NFS4_ACL_DIR;
434 error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
435 if (error == -EINVAL) {
436 error = nfserr_attrnotsupp;
438 } else if (error < 0)
442 error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS);
448 error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT);
456 posix_acl_release(pacl);
457 posix_acl_release(dpacl);
460 error = nfserrno(error);
464 static struct posix_acl *
465 _get_posix_acl(struct dentry *dentry, char *key)
468 struct posix_acl *pacl = NULL;
471 buflen = nfsd_getxattr(dentry, key, &buf);
475 return ERR_PTR(buflen);
477 pacl = posix_acl_from_xattr(buf, buflen);
483 nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
485 struct inode *inode = dentry->d_inode;
487 struct posix_acl *pacl = NULL, *dpacl = NULL;
488 unsigned int flags = 0;
490 pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
491 if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
492 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
494 error = PTR_ERR(pacl);
499 if (S_ISDIR(inode->i_mode)) {
500 dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
501 if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
503 else if (IS_ERR(dpacl)) {
504 error = PTR_ERR(dpacl);
508 flags = NFS4_ACL_DIR;
511 *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
513 error = PTR_ERR(*acl);
517 posix_acl_release(pacl);
518 posix_acl_release(dpacl);
522 #endif /* defined(CONFIG_NFS_V4) */
524 #ifdef CONFIG_NFSD_V3
526 * Check server access rights to a file system object
532 static struct accessmap nfs3_regaccess[] = {
533 { NFS3_ACCESS_READ, MAY_READ },
534 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
535 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC },
536 { NFS3_ACCESS_EXTEND, MAY_WRITE },
541 static struct accessmap nfs3_diraccess[] = {
542 { NFS3_ACCESS_READ, MAY_READ },
543 { NFS3_ACCESS_LOOKUP, MAY_EXEC },
544 { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC },
545 { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE },
546 { NFS3_ACCESS_DELETE, MAY_REMOVE },
551 static struct accessmap nfs3_anyaccess[] = {
552 /* Some clients - Solaris 2.6 at least, make an access call
553 * to the server to check for access for things like /dev/null
554 * (which really, the server doesn't care about). So
555 * We provide simple access checking for them, looking
556 * mainly at mode bits, and we make sure to ignore read-only
559 { NFS3_ACCESS_READ, MAY_READ },
560 { NFS3_ACCESS_EXECUTE, MAY_EXEC },
561 { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS },
562 { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS },
568 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
570 struct accessmap *map;
571 struct svc_export *export;
572 struct dentry *dentry;
573 u32 query, result = 0, sresult = 0;
576 error = fh_verify(rqstp, fhp, 0, MAY_NOP);
580 export = fhp->fh_export;
581 dentry = fhp->fh_dentry;
583 if (S_ISREG(dentry->d_inode->i_mode))
584 map = nfs3_regaccess;
585 else if (S_ISDIR(dentry->d_inode->i_mode))
586 map = nfs3_diraccess;
588 map = nfs3_anyaccess;
592 for (; map->access; map++) {
593 if (map->access & query) {
596 sresult |= map->access;
598 err2 = nfsd_permission(export, dentry, map->how);
601 result |= map->access;
604 /* the following error codes just mean the access was not allowed,
605 * rather than an error occurred */
609 /* simply don't "or" in the access bit. */
619 *supported = sresult;
624 #endif /* CONFIG_NFSD_V3 */
629 * Open an existing file or directory.
630 * The access argument indicates the type of open (read/write/lock)
631 * N.B. After this call fhp needs an fh_put
634 nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
635 int access, struct file **filp)
637 struct dentry *dentry;
639 int flags = O_RDONLY|O_LARGEFILE, err;
642 * If we get here, then the client has already done an "open",
643 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
644 * in case a chmod has now revoked permission.
646 err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE);
650 dentry = fhp->fh_dentry;
651 inode = dentry->d_inode;
653 /* Disallow write access to files with the append-only bit set
654 * or any access when mandatory locking enabled
657 if (IS_APPEND(inode) && (access & MAY_WRITE))
659 if (IS_ISMNDLK(inode))
666 * Check to see if there are any leases on this file.
667 * This may block while leases are broken.
669 err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0));
670 if (err == -EWOULDBLOCK)
672 if (err) /* NOMEM or WOULDBLOCK */
675 if (access & MAY_WRITE) {
676 if (access & MAY_READ)
677 flags = O_RDWR|O_LARGEFILE;
679 flags = O_WRONLY|O_LARGEFILE;
683 *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags);
685 err = PTR_ERR(*filp);
697 nfsd_close(struct file *filp)
704 * As this calls fsync (not fdatasync) there is no need for a write_inode
707 static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
708 const struct file_operations *fop)
710 struct inode *inode = dp->d_inode;
711 int (*fsync) (struct file *, struct dentry *, int);
714 err = filemap_fdatawrite(inode->i_mapping);
715 if (err == 0 && fop && (fsync = fop->fsync))
716 err = fsync(filp, dp, 0);
718 err = filemap_fdatawait(inode->i_mapping);
725 nfsd_sync(struct file *filp)
728 struct inode *inode = filp->f_dentry->d_inode;
729 dprintk("nfsd: sync file %s\n", filp->f_dentry->d_name.name);
730 mutex_lock(&inode->i_mutex);
731 err=nfsd_dosync(filp, filp->f_dentry, filp->f_op);
732 mutex_unlock(&inode->i_mutex);
738 nfsd_sync_dir(struct dentry *dp)
740 return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
744 * Obtain the readahead parameters for the file
745 * specified by (dev, ino).
747 static DEFINE_SPINLOCK(ra_lock);
749 static inline struct raparms *
750 nfsd_get_raparms(dev_t dev, ino_t ino)
752 struct raparms *ra, **rap, **frap = NULL;
756 for (rap = &raparm_cache; (ra = *rap); rap = &ra->p_next) {
757 if (ra->p_ino == ino && ra->p_dev == dev)
760 if (ra->p_count == 0)
763 depth = nfsdstats.ra_size*11/10;
765 spin_unlock(&ra_lock);
774 if (rap != &raparm_cache) {
776 ra->p_next = raparm_cache;
780 nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
781 spin_unlock(&ra_lock);
786 * Grab and keep cached pages assosiated with a file in the svc_rqst
787 * so that they can be passed to the netowork sendmsg/sendpage routines
788 * directrly. They will be released after the sending has completed.
791 nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size)
793 unsigned long count = desc->count;
794 struct svc_rqst *rqstp = desc->arg.data;
799 if (rqstp->rq_res.page_len == 0) {
801 rqstp->rq_respages[rqstp->rq_resused++] = page;
802 rqstp->rq_res.page_base = offset;
803 rqstp->rq_res.page_len = size;
804 } else if (page != rqstp->rq_respages[rqstp->rq_resused-1]) {
806 rqstp->rq_respages[rqstp->rq_resused++] = page;
807 rqstp->rq_res.page_len += size;
809 rqstp->rq_res.page_len += size;
812 desc->count = count - size;
813 desc->written += size;
818 nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
819 loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
827 inode = file->f_dentry->d_inode;
829 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
830 (!lock_may_read(inode, offset, *count)))
834 /* Get readahead parameters */
835 ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
838 file->f_ra = ra->p_ra;
840 if (file->f_op->sendfile) {
841 svc_pushback_unused_pages(rqstp);
842 err = file->f_op->sendfile(file, &offset, *count,
843 nfsd_read_actor, rqstp);
847 err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
851 /* Write back readahead params */
854 ra->p_ra = file->f_ra;
857 spin_unlock(&ra_lock);
861 nfsdstats.io_read += err;
864 fsnotify_access(file->f_dentry);
871 static void kill_suid(struct dentry *dentry)
874 ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;
876 mutex_lock(&dentry->d_inode->i_mutex);
877 notify_change(dentry, &ia);
878 mutex_unlock(&dentry->d_inode->i_mutex);
882 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
883 loff_t offset, struct kvec *vec, int vlen,
884 unsigned long cnt, int *stablep)
886 struct svc_export *exp;
887 struct dentry *dentry;
891 int stable = *stablep;
896 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
897 (!lock_may_write(file->f_dentry->d_inode, offset, cnt)))
901 dentry = file->f_dentry;
902 inode = dentry->d_inode;
903 exp = fhp->fh_export;
906 * Request sync writes if
907 * - the sync export option has been set, or
908 * - the client requested O_SYNC behavior (NFSv3 feature).
909 * - The file system doesn't support fsync().
910 * When gathered writes have been configured for this volume,
911 * flushing the data to disk is handled separately below.
914 if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */
916 *stablep = 2; /* FILE_SYNC */
921 if (stable && !EX_WGATHER(exp))
922 file->f_flags |= O_SYNC;
924 /* Write the data. */
925 oldfs = get_fs(); set_fs(KERNEL_DS);
926 err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
929 nfsdstats.io_write += cnt;
930 fsnotify_modify(file->f_dentry);
933 /* clear setuid/setgid flag after write */
934 if (err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID)))
937 if (err >= 0 && stable) {
938 static ino_t last_ino;
939 static dev_t last_dev;
942 * Gathered writes: If another process is currently
943 * writing to the file, there's a high chance
944 * this is another nfsd (triggered by a bulk write
945 * from a client's biod). Rather than syncing the
946 * file with each write request, we sleep for 10 msec.
948 * I don't know if this roughly approximates
949 * C. Juszak's idea of gathered writes, but it's a
950 * nice and simple solution (IMHO), and it seems to
953 if (EX_WGATHER(exp)) {
954 if (atomic_read(&inode->i_writecount) > 1
955 || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
956 dprintk("nfsd: write defer %d\n", current->pid);
958 dprintk("nfsd: write resume %d\n", current->pid);
961 if (inode->i_state & I_DIRTY) {
962 dprintk("nfsd: write sync %d\n", current->pid);
966 wake_up(&inode->i_wait);
969 last_ino = inode->i_ino;
970 last_dev = inode->i_sb->s_dev;
973 dprintk("nfsd: write complete err=%d\n", err);
983 * Read data from a file. count must contain the requested read count
984 * on entry. On return, *count contains the number of bytes actually read.
985 * N.B. After this call fhp needs an fh_put
988 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
989 loff_t offset, struct kvec *vec, int vlen,
990 unsigned long *count)
995 err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
996 MAY_READ|MAY_OWNER_OVERRIDE);
999 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1001 err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file);
1004 err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
1012 * Write data to a file.
1013 * The stable flag requests synchronous writes.
1014 * N.B. After this call fhp needs an fh_put
1017 nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
1018 loff_t offset, struct kvec *vec, int vlen, unsigned long cnt,
1024 err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
1025 MAY_WRITE|MAY_OWNER_OVERRIDE);
1028 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
1031 err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file);
1036 err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
1044 #ifdef CONFIG_NFSD_V3
1046 * Commit all pending writes to stable storage.
1047 * Strictly speaking, we could sync just the indicated file region here,
1048 * but there's currently no way we can ask the VFS to do so.
1050 * Unfortunately we cannot lock the file to make sure we return full WCC
1051 * data to the client, as locking happens lower down in the filesystem.
1054 nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
1055 loff_t offset, unsigned long count)
1060 if ((u64)count > ~(u64)offset)
1061 return nfserr_inval;
1063 if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0)
1065 if (EX_ISSYNC(fhp->fh_export)) {
1066 if (file->f_op && file->f_op->fsync) {
1067 err = nfserrno(nfsd_sync(file));
1069 err = nfserr_notsupp;
1076 #endif /* CONFIG_NFSD_V3 */
1079 * Create a file (regular, directory, device, fifo); UNIX sockets
1080 * not yet implemented.
1081 * If the response fh has been verified, the parent directory should
1082 * already be locked. Note that the parent directory is left locked.
1084 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1087 nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
1088 char *fname, int flen, struct iattr *iap,
1089 int type, dev_t rdev, struct svc_fh *resfhp)
1091 struct dentry *dentry, *dchild = NULL;
1099 if (isdotent(fname, flen))
1102 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1106 dentry = fhp->fh_dentry;
1107 dirp = dentry->d_inode;
1109 err = nfserr_notdir;
1110 if(!dirp->i_op || !dirp->i_op->lookup)
1113 * Check whether the response file handle has been verified yet.
1114 * If it has, the parent directory should already be locked.
1116 if (!resfhp->fh_dentry) {
1117 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1119 dchild = lookup_one_len(fname, dentry, flen);
1120 err = PTR_ERR(dchild);
1123 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1127 /* called from nfsd_proc_create */
1128 dchild = dget(resfhp->fh_dentry);
1129 if (!fhp->fh_locked) {
1130 /* not actually possible */
1132 "nfsd_create: parent %s/%s not locked!\n",
1133 dentry->d_parent->d_name.name,
1134 dentry->d_name.name);
1140 * Make sure the child dentry is still negative ...
1143 if (dchild->d_inode) {
1144 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1145 dentry->d_name.name, dchild->d_name.name);
1149 if (!(iap->ia_valid & ATTR_MODE))
1151 iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
1154 * Get the dir op function pointer.
1159 err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1162 err = vfs_mkdir(dirp, dchild, iap->ia_mode);
1168 err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
1171 printk("nfsd: bad file type %o in nfsd_create\n", type);
1177 if (EX_ISSYNC(fhp->fh_export)) {
1178 err = nfserrno(nfsd_sync_dir(dentry));
1179 write_inode_now(dchild->d_inode, 1);
1183 /* Set file attributes. Mode has already been set and
1184 * setting uid/gid works only for root. Irix appears to
1185 * send along the gid when it tries to implement setgid
1186 * directories via NFS.
1188 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
1189 int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1194 * Update the file handle to get the new inode info.
1197 err = fh_update(resfhp);
1199 if (dchild && !IS_ERR(dchild))
1204 err = nfserrno(err);
1208 #ifdef CONFIG_NFSD_V3
1210 * NFSv3 version of nfsd_create
1213 nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
1214 char *fname, int flen, struct iattr *iap,
1215 struct svc_fh *resfhp, int createmode, u32 *verifier,
1218 struct dentry *dentry, *dchild = NULL;
1221 __u32 v_mtime=0, v_atime=0;
1228 if (isdotent(fname, flen))
1230 if (!(iap->ia_valid & ATTR_MODE))
1232 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1236 dentry = fhp->fh_dentry;
1237 dirp = dentry->d_inode;
1239 /* Get all the sanity checks out of the way before
1240 * we lock the parent. */
1241 err = nfserr_notdir;
1242 if(!dirp->i_op || !dirp->i_op->lookup)
1247 * Compose the response file handle.
1249 dchild = lookup_one_len(fname, dentry, flen);
1250 err = PTR_ERR(dchild);
1254 err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
1258 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1259 /* while the verifier would fit in mtime+atime,
1260 * solaris7 gets confused (bugid 4218508) if these have
1261 * the high bit set, so we use the mode as well
1263 v_mtime = verifier[0]&0x7fffffff;
1264 v_atime = verifier[1]&0x7fffffff;
1266 | ((verifier[0]&0x80000000) >> (32-7)) /* u+x */
1267 | ((verifier[1]&0x80000000) >> (32-9)) /* u+r */
1271 if (dchild->d_inode) {
1274 switch (createmode) {
1275 case NFS3_CREATE_UNCHECKED:
1276 if (! S_ISREG(dchild->d_inode->i_mode))
1279 /* in nfsv4, we need to treat this case a little
1280 * differently. we don't want to truncate the
1281 * file now; this would be wrong if the OPEN
1282 * fails for some other reason. furthermore,
1283 * if the size is nonzero, we should ignore it
1284 * according to spec!
1286 *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
1289 iap->ia_valid &= ATTR_SIZE;
1293 case NFS3_CREATE_EXCLUSIVE:
1294 if ( dchild->d_inode->i_mtime.tv_sec == v_mtime
1295 && dchild->d_inode->i_atime.tv_sec == v_atime
1296 && dchild->d_inode->i_mode == v_mode
1297 && dchild->d_inode->i_size == 0 )
1300 case NFS3_CREATE_GUARDED:
1306 err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
1310 if (EX_ISSYNC(fhp->fh_export)) {
1311 err = nfserrno(nfsd_sync_dir(dentry));
1312 /* setattr will sync the child (or not) */
1315 if (createmode == NFS3_CREATE_EXCLUSIVE) {
1316 /* Cram the verifier into atime/mtime/mode */
1317 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
1318 | ATTR_MTIME_SET|ATTR_ATIME_SET
1320 /* XXX someone who knows this better please fix it for nsec */
1321 iap->ia_mtime.tv_sec = v_mtime;
1322 iap->ia_atime.tv_sec = v_atime;
1323 iap->ia_mtime.tv_nsec = 0;
1324 iap->ia_atime.tv_nsec = 0;
1325 iap->ia_mode = v_mode;
1328 /* Set file attributes.
1329 * Mode has already been set but we might need to reset it
1330 * for CREATE_EXCLUSIVE
1331 * Irix appears to send along the gid when it tries to
1332 * implement setgid directories via NFS. Clear out all that cruft.
1335 if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID)) != 0) {
1336 int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
1342 * Update the filehandle to get the new inode info.
1345 err = fh_update(resfhp);
1349 if (dchild && !IS_ERR(dchild))
1354 err = nfserrno(err);
1357 #endif /* CONFIG_NFSD_V3 */
1360 * Read a symlink. On entry, *lenp must contain the maximum path length that
1361 * fits into the buffer. On return, it contains the true length.
1362 * N.B. After this call fhp needs an fh_put
1365 nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
1367 struct dentry *dentry;
1368 struct inode *inode;
1372 err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP);
1376 dentry = fhp->fh_dentry;
1377 inode = dentry->d_inode;
1380 if (!inode->i_op || !inode->i_op->readlink)
1383 touch_atime(fhp->fh_export->ex_mnt, dentry);
1384 /* N.B. Why does this call need a get_fs()??
1385 * Remove the set_fs and watch the fireworks:-) --okir
1388 oldfs = get_fs(); set_fs(KERNEL_DS);
1389 err = inode->i_op->readlink(dentry, buf, *lenp);
1400 err = nfserrno(err);
1405 * Create a symlink and look up its inode
1406 * N.B. After this call _both_ fhp and resfhp need an fh_put
1409 nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
1410 char *fname, int flen,
1411 char *path, int plen,
1412 struct svc_fh *resfhp,
1415 struct dentry *dentry, *dnew;
1423 if (isdotent(fname, flen))
1426 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
1430 dentry = fhp->fh_dentry;
1431 dnew = lookup_one_len(fname, dentry, flen);
1432 err = PTR_ERR(dnew);
1437 /* Only the MODE ATTRibute is even vaguely meaningful */
1438 if (iap && (iap->ia_valid & ATTR_MODE))
1439 mode = iap->ia_mode & S_IALLUGO;
1441 if (unlikely(path[plen] != 0)) {
1442 char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
1443 if (path_alloced == NULL)
1446 strncpy(path_alloced, path, plen);
1447 path_alloced[plen] = 0;
1448 err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
1449 kfree(path_alloced);
1452 err = vfs_symlink(dentry->d_inode, dnew, path, mode);
1455 if (EX_ISSYNC(fhp->fh_export))
1456 err = nfsd_sync_dir(dentry);
1458 err = nfserrno(err);
1461 cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
1463 if (err==0) err = cerr;
1468 err = nfserrno(err);
1474 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1477 nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
1478 char *name, int len, struct svc_fh *tfhp)
1480 struct dentry *ddir, *dnew, *dold;
1481 struct inode *dirp, *dest;
1484 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
1487 err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP);
1495 if (isdotent(name, len))
1499 ddir = ffhp->fh_dentry;
1500 dirp = ddir->d_inode;
1502 dnew = lookup_one_len(name, ddir, len);
1503 err = PTR_ERR(dnew);
1507 dold = tfhp->fh_dentry;
1508 dest = dold->d_inode;
1510 err = vfs_link(dold, dirp, dnew);
1512 if (EX_ISSYNC(ffhp->fh_export)) {
1513 err = nfserrno(nfsd_sync_dir(ddir));
1514 write_inode_now(dest, 1);
1517 if (err == -EXDEV && rqstp->rq_vers == 2)
1520 err = nfserrno(err);
1530 err = nfserrno(err);
1536 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1539 nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
1540 struct svc_fh *tfhp, char *tname, int tlen)
1542 struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap;
1543 struct inode *fdir, *tdir;
1546 err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
1549 err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
1553 fdentry = ffhp->fh_dentry;
1554 fdir = fdentry->d_inode;
1556 tdentry = tfhp->fh_dentry;
1557 tdir = tdentry->d_inode;
1559 err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
1560 if (ffhp->fh_export != tfhp->fh_export)
1564 if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
1567 /* cannot use fh_lock as we need deadlock protective ordering
1568 * so do it by hand */
1569 trap = lock_rename(tdentry, fdentry);
1570 ffhp->fh_locked = tfhp->fh_locked = 1;
1574 odentry = lookup_one_len(fname, fdentry, flen);
1575 err = PTR_ERR(odentry);
1576 if (IS_ERR(odentry))
1580 if (!odentry->d_inode)
1583 if (odentry == trap)
1586 ndentry = lookup_one_len(tname, tdentry, tlen);
1587 err = PTR_ERR(ndentry);
1588 if (IS_ERR(ndentry))
1591 if (ndentry == trap)
1595 if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1596 ((atomic_read(&odentry->d_count) > 1)
1597 || (atomic_read(&ndentry->d_count) > 1))) {
1601 err = vfs_rename(fdir, odentry, tdir, ndentry);
1602 if (!err && EX_ISSYNC(tfhp->fh_export)) {
1603 err = nfsd_sync_dir(tdentry);
1605 err = nfsd_sync_dir(fdentry);
1614 err = nfserrno(err);
1616 /* we cannot reply on fh_unlock on the two filehandles,
1617 * as that would do the wrong thing if the two directories
1618 * were the same, so again we do it by hand
1620 fill_post_wcc(ffhp);
1621 fill_post_wcc(tfhp);
1622 unlock_rename(tdentry, fdentry);
1623 ffhp->fh_locked = tfhp->fh_locked = 0;
1630 * Unlink a file or directory
1631 * N.B. After this call fhp needs an fh_put
1634 nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
1635 char *fname, int flen)
1637 struct dentry *dentry, *rdentry;
1642 if (!flen || isdotent(fname, flen))
1644 err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
1649 dentry = fhp->fh_dentry;
1650 dirp = dentry->d_inode;
1652 rdentry = lookup_one_len(fname, dentry, flen);
1653 err = PTR_ERR(rdentry);
1654 if (IS_ERR(rdentry))
1657 if (!rdentry->d_inode) {
1664 type = rdentry->d_inode->i_mode & S_IFMT;
1666 if (type != S_IFDIR) { /* It's UNLINK */
1668 if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
1669 (atomic_read(&rdentry->d_count) > 1)) {
1673 err = vfs_unlink(dirp, rdentry);
1674 } else { /* It's RMDIR */
1675 err = vfs_rmdir(dirp, rdentry);
1681 EX_ISSYNC(fhp->fh_export))
1682 err = nfsd_sync_dir(dentry);
1685 err = nfserrno(err);
1691 * Read entries from a directory.
1692 * The NFSv3/4 verifier we ignore for now.
1695 nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp,
1696 struct readdir_cd *cdp, encode_dent_fn func)
1700 loff_t offset = *offsetp;
1702 err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file);
1706 offset = vfs_llseek(file, offset, 0);
1708 err = nfserrno((int)offset);
1713 * Read the directory entries. This silly loop is necessary because
1714 * readdir() is not guaranteed to fill up the entire buffer, but
1715 * may choose to do less.
1719 cdp->err = nfserr_eof; /* will be cleared on successful read */
1720 err = vfs_readdir(file, (filldir_t) func, cdp);
1721 } while (err >=0 && cdp->err == nfs_ok);
1723 err = nfserrno(err);
1726 *offsetp = vfs_llseek(file, 0, 1);
1728 if (err == nfserr_eof || err == nfserr_toosmall)
1729 err = nfs_ok; /* can still be found in ->err */
1737 * Get file system stats
1738 * N.B. After this call fhp needs an fh_put
1741 nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat)
1743 int err = fh_verify(rqstp, fhp, 0, MAY_NOP);
1744 if (!err && vfs_statfs(fhp->fh_dentry,stat))
1750 * Check for a user's access permissions to this inode.
1753 nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc)
1755 struct inode *inode = dentry->d_inode;
1761 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
1763 (acc & MAY_READ)? " read" : "",
1764 (acc & MAY_WRITE)? " write" : "",
1765 (acc & MAY_EXEC)? " exec" : "",
1766 (acc & MAY_SATTR)? " sattr" : "",
1767 (acc & MAY_TRUNC)? " trunc" : "",
1768 (acc & MAY_LOCK)? " lock" : "",
1769 (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "",
1771 IS_IMMUTABLE(inode)? " immut" : "",
1772 IS_APPEND(inode)? " append" : "",
1773 IS_RDONLY(inode)? " ro" : "");
1774 dprintk(" owner %d/%d user %d/%d\n",
1775 inode->i_uid, inode->i_gid, current->fsuid, current->fsgid);
1778 /* Normally we reject any write/sattr etc access on a read-only file
1779 * system. But if it is IRIX doing check on write-access for a
1780 * device special file, we ignore rofs.
1782 if (!(acc & MAY_LOCAL_ACCESS))
1783 if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) {
1784 if (EX_RDONLY(exp) || IS_RDONLY(inode))
1786 if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode))
1789 if ((acc & MAY_TRUNC) && IS_APPEND(inode))
1792 if (acc & MAY_LOCK) {
1793 /* If we cannot rely on authentication in NLM requests,
1794 * just allow locks, otherwise require read permission, or
1797 if (exp->ex_flags & NFSEXP_NOAUTHNLM)
1800 acc = MAY_READ | MAY_OWNER_OVERRIDE;
1803 * The file owner always gets access permission for accesses that
1804 * would normally be checked at open time. This is to make
1805 * file access work even when the client has done a fchmod(fd, 0).
1807 * However, `cp foo bar' should fail nevertheless when bar is
1808 * readonly. A sensible way to do this might be to reject all
1809 * attempts to truncate a read-only file, because a creat() call
1810 * always implies file truncation.
1811 * ... but this isn't really fair. A process may reasonably call
1812 * ftruncate on an open file descriptor on a file with perm 000.
1813 * We must trust the client to do permission checking - using "ACCESS"
1816 if ((acc & MAY_OWNER_OVERRIDE) &&
1817 inode->i_uid == current->fsuid)
1820 err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL);
1822 /* Allow read access to binaries even when mode 111 */
1823 if (err == -EACCES && S_ISREG(inode->i_mode) &&
1824 acc == (MAY_READ | MAY_OWNER_OVERRIDE))
1825 err = permission(inode, MAY_EXEC, NULL);
1827 return err? nfserrno(err) : 0;
1831 nfsd_racache_shutdown(void)
1835 dprintk("nfsd: freeing readahead buffers.\n");
1837 raparm_cache = raparml = NULL;
1840 * Initialize readahead param cache
1843 nfsd_racache_init(int cache_size)
1849 raparml = kmalloc(sizeof(struct raparms) * cache_size, GFP_KERNEL);
1851 if (raparml != NULL) {
1852 dprintk("nfsd: allocating %d readahead buffers.\n",
1854 memset(raparml, 0, sizeof(struct raparms) * cache_size);
1855 for (i = 0; i < cache_size - 1; i++) {
1856 raparml[i].p_next = raparml + i + 1;
1858 raparm_cache = raparml;
1861 "nfsd: Could not allocate memory read-ahead cache.\n");
1864 nfsdstats.ra_size = cache_size;
1868 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
1870 nfsd_get_posix_acl(struct svc_fh *fhp, int type)
1872 struct inode *inode = fhp->fh_dentry->d_inode;
1876 struct posix_acl *acl;
1878 if (!IS_POSIXACL(inode))
1879 return ERR_PTR(-EOPNOTSUPP);
1882 case ACL_TYPE_ACCESS:
1883 name = POSIX_ACL_XATTR_ACCESS;
1885 case ACL_TYPE_DEFAULT:
1886 name = POSIX_ACL_XATTR_DEFAULT;
1889 return ERR_PTR(-EOPNOTSUPP);
1892 size = nfsd_getxattr(fhp->fh_dentry, name, &value);
1894 return ERR_PTR(size);
1896 acl = posix_acl_from_xattr(value, size);
1902 nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl)
1904 struct inode *inode = fhp->fh_dentry->d_inode;
1910 if (!IS_POSIXACL(inode) || !inode->i_op ||
1911 !inode->i_op->setxattr || !inode->i_op->removexattr)
1914 case ACL_TYPE_ACCESS:
1915 name = POSIX_ACL_XATTR_ACCESS;
1917 case ACL_TYPE_DEFAULT:
1918 name = POSIX_ACL_XATTR_DEFAULT;
1924 if (acl && acl->a_count) {
1925 size = posix_acl_xattr_size(acl->a_count);
1926 value = kmalloc(size, GFP_KERNEL);
1929 error = posix_acl_to_xattr(acl, value, size);
1937 error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0);
1939 if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT)
1942 error = vfs_removexattr(fhp->fh_dentry, name);
1943 if (error == -ENODATA)
1952 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */