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>
52 #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_V4)
371 set_nfsv4_acl_one(struct dentry
*dentry
, struct posix_acl
*pacl
, char *key
)
377 struct inode
*inode
= dentry
->d_inode
;
379 buflen
= posix_acl_xattr_size(pacl
->a_count
);
380 buf
= kmalloc(buflen
, GFP_KERNEL
);
385 len
= posix_acl_to_xattr(pacl
, buf
, buflen
);
392 if (inode
->i_op
&& inode
->i_op
->setxattr
) {
394 security_inode_setxattr(dentry
, key
, buf
, len
, 0);
395 error
= inode
->i_op
->setxattr(dentry
, key
, buf
, len
, 0);
397 security_inode_post_setxattr(dentry
, key
, buf
, len
, 0);
406 nfsd4_set_nfs4_acl(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
407 struct nfs4_acl
*acl
)
410 struct dentry
*dentry
;
412 struct posix_acl
*pacl
= NULL
, *dpacl
= NULL
;
413 unsigned int flags
= 0;
416 error
= fh_verify(rqstp
, fhp
, 0 /* S_IFREG */, MAY_SATTR
);
420 dentry
= fhp
->fh_dentry
;
421 inode
= dentry
->d_inode
;
422 if (S_ISDIR(inode
->i_mode
))
423 flags
= NFS4_ACL_DIR
;
425 error
= nfs4_acl_nfsv4_to_posix(acl
, &pacl
, &dpacl
, flags
);
426 if (error
== -EINVAL
) {
427 error
= nfserr_attrnotsupp
;
429 } else if (error
< 0)
433 error
= set_nfsv4_acl_one(dentry
, pacl
, POSIX_ACL_XATTR_ACCESS
);
439 error
= set_nfsv4_acl_one(dentry
, dpacl
, POSIX_ACL_XATTR_DEFAULT
);
447 posix_acl_release(pacl
);
448 posix_acl_release(dpacl
);
451 error
= nfserrno(error
);
455 static struct posix_acl
*
456 _get_posix_acl(struct dentry
*dentry
, char *key
)
458 struct inode
*inode
= dentry
->d_inode
;
460 int buflen
, error
= 0;
461 struct posix_acl
*pacl
= NULL
;
464 if (inode
->i_op
== NULL
)
466 if (inode
->i_op
->getxattr
== NULL
)
469 error
= security_inode_getxattr(dentry
, key
);
473 buflen
= inode
->i_op
->getxattr(dentry
, key
, NULL
, 0);
475 error
= buflen
< 0 ? buflen
: -ENODATA
;
479 buf
= kmalloc(buflen
, GFP_KERNEL
);
485 error
= inode
->i_op
->getxattr(dentry
, key
, buf
, buflen
);
489 pacl
= posix_acl_from_xattr(buf
, buflen
);
494 pacl
= ERR_PTR(error
);
499 nfsd4_get_nfs4_acl(struct svc_rqst
*rqstp
, struct dentry
*dentry
, struct nfs4_acl
**acl
)
501 struct inode
*inode
= dentry
->d_inode
;
503 struct posix_acl
*pacl
= NULL
, *dpacl
= NULL
;
504 unsigned int flags
= 0;
506 pacl
= _get_posix_acl(dentry
, POSIX_ACL_XATTR_ACCESS
);
507 if (IS_ERR(pacl
) && PTR_ERR(pacl
) == -ENODATA
)
508 pacl
= posix_acl_from_mode(inode
->i_mode
, GFP_KERNEL
);
510 error
= PTR_ERR(pacl
);
515 if (S_ISDIR(inode
->i_mode
)) {
516 dpacl
= _get_posix_acl(dentry
, POSIX_ACL_XATTR_DEFAULT
);
517 if (IS_ERR(dpacl
) && PTR_ERR(dpacl
) == -ENODATA
)
519 else if (IS_ERR(dpacl
)) {
520 error
= PTR_ERR(dpacl
);
524 flags
= NFS4_ACL_DIR
;
527 *acl
= nfs4_acl_posix_to_nfsv4(pacl
, dpacl
, flags
);
529 error
= PTR_ERR(*acl
);
533 posix_acl_release(pacl
);
534 posix_acl_release(dpacl
);
538 #endif /* defined(CONFIG_NFS_V4) */
540 #ifdef CONFIG_NFSD_V3
542 * Check server access rights to a file system object
548 static struct accessmap nfs3_regaccess
[] = {
549 { NFS3_ACCESS_READ
, MAY_READ
},
550 { NFS3_ACCESS_EXECUTE
, MAY_EXEC
},
551 { NFS3_ACCESS_MODIFY
, MAY_WRITE
|MAY_TRUNC
},
552 { NFS3_ACCESS_EXTEND
, MAY_WRITE
},
557 static struct accessmap nfs3_diraccess
[] = {
558 { NFS3_ACCESS_READ
, MAY_READ
},
559 { NFS3_ACCESS_LOOKUP
, MAY_EXEC
},
560 { NFS3_ACCESS_MODIFY
, MAY_EXEC
|MAY_WRITE
|MAY_TRUNC
},
561 { NFS3_ACCESS_EXTEND
, MAY_EXEC
|MAY_WRITE
},
562 { NFS3_ACCESS_DELETE
, MAY_REMOVE
},
567 static struct accessmap nfs3_anyaccess
[] = {
568 /* Some clients - Solaris 2.6 at least, make an access call
569 * to the server to check for access for things like /dev/null
570 * (which really, the server doesn't care about). So
571 * We provide simple access checking for them, looking
572 * mainly at mode bits, and we make sure to ignore read-only
575 { NFS3_ACCESS_READ
, MAY_READ
},
576 { NFS3_ACCESS_EXECUTE
, MAY_EXEC
},
577 { NFS3_ACCESS_MODIFY
, MAY_WRITE
|MAY_LOCAL_ACCESS
},
578 { NFS3_ACCESS_EXTEND
, MAY_WRITE
|MAY_LOCAL_ACCESS
},
584 nfsd_access(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, u32
*access
, u32
*supported
)
586 struct accessmap
*map
;
587 struct svc_export
*export
;
588 struct dentry
*dentry
;
589 u32 query
, result
= 0, sresult
= 0;
592 error
= fh_verify(rqstp
, fhp
, 0, MAY_NOP
);
596 export
= fhp
->fh_export
;
597 dentry
= fhp
->fh_dentry
;
599 if (S_ISREG(dentry
->d_inode
->i_mode
))
600 map
= nfs3_regaccess
;
601 else if (S_ISDIR(dentry
->d_inode
->i_mode
))
602 map
= nfs3_diraccess
;
604 map
= nfs3_anyaccess
;
608 for (; map
->access
; map
++) {
609 if (map
->access
& query
) {
612 sresult
|= map
->access
;
614 err2
= nfsd_permission(export
, dentry
, map
->how
);
617 result
|= map
->access
;
620 /* the following error codes just mean the access was not allowed,
621 * rather than an error occurred */
625 /* simply don't "or" in the access bit. */
635 *supported
= sresult
;
640 #endif /* CONFIG_NFSD_V3 */
645 * Open an existing file or directory.
646 * The access argument indicates the type of open (read/write/lock)
647 * N.B. After this call fhp needs an fh_put
650 nfsd_open(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, int type
,
651 int access
, struct file
**filp
)
653 struct dentry
*dentry
;
655 int flags
= O_RDONLY
|O_LARGEFILE
, err
;
658 * If we get here, then the client has already done an "open",
659 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
660 * in case a chmod has now revoked permission.
662 err
= fh_verify(rqstp
, fhp
, type
, access
| MAY_OWNER_OVERRIDE
);
666 dentry
= fhp
->fh_dentry
;
667 inode
= dentry
->d_inode
;
669 /* Disallow write access to files with the append-only bit set
670 * or any access when mandatory locking enabled
673 if (IS_APPEND(inode
) && (access
& MAY_WRITE
))
675 if (IS_ISMNDLK(inode
))
682 * Check to see if there are any leases on this file.
683 * This may block while leases are broken.
685 err
= break_lease(inode
, O_NONBLOCK
| ((access
& MAY_WRITE
) ? FMODE_WRITE
: 0));
686 if (err
== -EWOULDBLOCK
)
688 if (err
) /* NOMEM or WOULDBLOCK */
691 if (access
& MAY_WRITE
) {
692 flags
= O_WRONLY
|O_LARGEFILE
;
696 *filp
= dentry_open(dget(dentry
), mntget(fhp
->fh_export
->ex_mnt
), flags
);
698 err
= PTR_ERR(*filp
);
710 nfsd_close(struct file
*filp
)
717 * As this calls fsync (not fdatasync) there is no need for a write_inode
720 static inline int nfsd_dosync(struct file
*filp
, struct dentry
*dp
,
721 struct file_operations
*fop
)
723 struct inode
*inode
= dp
->d_inode
;
724 int (*fsync
) (struct file
*, struct dentry
*, int);
727 filemap_fdatawrite(inode
->i_mapping
);
728 if (fop
&& (fsync
= fop
->fsync
))
729 err
=fsync(filp
, dp
, 0);
730 filemap_fdatawait(inode
->i_mapping
);
732 return nfserrno(err
);
737 nfsd_sync(struct file
*filp
)
740 struct inode
*inode
= filp
->f_dentry
->d_inode
;
741 dprintk("nfsd: sync file %s\n", filp
->f_dentry
->d_name
.name
);
743 err
=nfsd_dosync(filp
, filp
->f_dentry
, filp
->f_op
);
750 nfsd_sync_dir(struct dentry
*dp
)
752 nfsd_dosync(NULL
, dp
, dp
->d_inode
->i_fop
);
756 * Obtain the readahead parameters for the file
757 * specified by (dev, ino).
759 static DEFINE_SPINLOCK(ra_lock
);
761 static inline struct raparms
*
762 nfsd_get_raparms(dev_t dev
, ino_t ino
)
764 struct raparms
*ra
, **rap
, **frap
= NULL
;
768 for (rap
= &raparm_cache
; (ra
= *rap
); rap
= &ra
->p_next
) {
769 if (ra
->p_ino
== ino
&& ra
->p_dev
== dev
)
772 if (ra
->p_count
== 0)
775 depth
= nfsdstats
.ra_size
*11/10;
777 spin_unlock(&ra_lock
);
786 if (rap
!= &raparm_cache
) {
788 ra
->p_next
= raparm_cache
;
792 nfsdstats
.ra_depth
[depth
*10/nfsdstats
.ra_size
]++;
793 spin_unlock(&ra_lock
);
798 * Grab and keep cached pages assosiated with a file in the svc_rqst
799 * so that they can be passed to the netowork sendmsg/sendpage routines
800 * directrly. They will be released after the sending has completed.
803 nfsd_read_actor(read_descriptor_t
*desc
, struct page
*page
, unsigned long offset
, unsigned long size
)
805 unsigned long count
= desc
->count
;
806 struct svc_rqst
*rqstp
= desc
->arg
.data
;
811 if (rqstp
->rq_res
.page_len
== 0) {
813 rqstp
->rq_respages
[rqstp
->rq_resused
++] = page
;
814 rqstp
->rq_res
.page_base
= offset
;
815 rqstp
->rq_res
.page_len
= size
;
816 } else if (page
!= rqstp
->rq_respages
[rqstp
->rq_resused
-1]) {
818 rqstp
->rq_respages
[rqstp
->rq_resused
++] = page
;
819 rqstp
->rq_res
.page_len
+= size
;
821 rqstp
->rq_res
.page_len
+= size
;
824 desc
->count
= count
- size
;
825 desc
->written
+= size
;
830 nfsd_vfs_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
831 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long *count
)
839 inode
= file
->f_dentry
->d_inode
;
841 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
842 (!lock_may_read(inode
, offset
, *count
)))
846 /* Get readahead parameters */
847 ra
= nfsd_get_raparms(inode
->i_sb
->s_dev
, inode
->i_ino
);
850 file
->f_ra
= ra
->p_ra
;
852 if (file
->f_op
->sendfile
) {
853 svc_pushback_unused_pages(rqstp
);
854 err
= file
->f_op
->sendfile(file
, &offset
, *count
,
855 nfsd_read_actor
, rqstp
);
859 err
= vfs_readv(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
863 /* Write back readahead params */
866 ra
->p_ra
= file
->f_ra
;
869 spin_unlock(&ra_lock
);
873 nfsdstats
.io_read
+= err
;
876 fsnotify_access(file
->f_dentry
);
883 static void kill_suid(struct dentry
*dentry
)
886 ia
.ia_valid
= ATTR_KILL_SUID
| ATTR_KILL_SGID
;
888 down(&dentry
->d_inode
->i_sem
);
889 notify_change(dentry
, &ia
);
890 up(&dentry
->d_inode
->i_sem
);
894 nfsd_vfs_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
895 loff_t offset
, struct kvec
*vec
, int vlen
,
896 unsigned long cnt
, int *stablep
)
898 struct svc_export
*exp
;
899 struct dentry
*dentry
;
903 int stable
= *stablep
;
908 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
909 (!lock_may_write(file
->f_dentry
->d_inode
, offset
, cnt
)))
913 dentry
= file
->f_dentry
;
914 inode
= dentry
->d_inode
;
915 exp
= fhp
->fh_export
;
918 * Request sync writes if
919 * - the sync export option has been set, or
920 * - the client requested O_SYNC behavior (NFSv3 feature).
921 * - The file system doesn't support fsync().
922 * When gathered writes have been configured for this volume,
923 * flushing the data to disk is handled separately below.
926 if (file
->f_op
->fsync
== 0) {/* COMMIT3 cannot work */
928 *stablep
= 2; /* FILE_SYNC */
933 if (stable
&& !EX_WGATHER(exp
))
934 file
->f_flags
|= O_SYNC
;
936 /* Write the data. */
937 oldfs
= get_fs(); set_fs(KERNEL_DS
);
938 err
= vfs_writev(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
941 nfsdstats
.io_write
+= cnt
;
942 fsnotify_modify(file
->f_dentry
);
945 /* clear setuid/setgid flag after write */
946 if (err
>= 0 && (inode
->i_mode
& (S_ISUID
| S_ISGID
)))
949 if (err
>= 0 && stable
) {
950 static ino_t last_ino
;
951 static dev_t last_dev
;
954 * Gathered writes: If another process is currently
955 * writing to the file, there's a high chance
956 * this is another nfsd (triggered by a bulk write
957 * from a client's biod). Rather than syncing the
958 * file with each write request, we sleep for 10 msec.
960 * I don't know if this roughly approximates
961 * C. Juszak's idea of gathered writes, but it's a
962 * nice and simple solution (IMHO), and it seems to
965 if (EX_WGATHER(exp
)) {
966 if (atomic_read(&inode
->i_writecount
) > 1
967 || (last_ino
== inode
->i_ino
&& last_dev
== inode
->i_sb
->s_dev
)) {
968 dprintk("nfsd: write defer %d\n", current
->pid
);
970 dprintk("nfsd: write resume %d\n", current
->pid
);
973 if (inode
->i_state
& I_DIRTY
) {
974 dprintk("nfsd: write sync %d\n", current
->pid
);
978 wake_up(&inode
->i_wait
);
981 last_ino
= inode
->i_ino
;
982 last_dev
= inode
->i_sb
->s_dev
;
985 dprintk("nfsd: write complete err=%d\n", err
);
995 * Read data from a file. count must contain the requested read count
996 * on entry. On return, *count contains the number of bytes actually read.
997 * N.B. After this call fhp needs an fh_put
1000 nfsd_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1001 loff_t offset
, struct kvec
*vec
, int vlen
,
1002 unsigned long *count
)
1007 err
= nfsd_permission(fhp
->fh_export
, fhp
->fh_dentry
,
1008 MAY_READ
|MAY_OWNER_OVERRIDE
);
1011 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
1013 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_READ
, &file
);
1016 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
1024 * Write data to a file.
1025 * The stable flag requests synchronous writes.
1026 * N.B. After this call fhp needs an fh_put
1029 nfsd_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1030 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long cnt
,
1036 err
= nfsd_permission(fhp
->fh_export
, fhp
->fh_dentry
,
1037 MAY_WRITE
|MAY_OWNER_OVERRIDE
);
1040 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
, cnt
,
1043 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_WRITE
, &file
);
1048 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
,
1056 #ifdef CONFIG_NFSD_V3
1058 * Commit all pending writes to stable storage.
1059 * Strictly speaking, we could sync just the indicated file region here,
1060 * but there's currently no way we can ask the VFS to do so.
1062 * Unfortunately we cannot lock the file to make sure we return full WCC
1063 * data to the client, as locking happens lower down in the filesystem.
1066 nfsd_commit(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1067 loff_t offset
, unsigned long count
)
1072 if ((u64
)count
> ~(u64
)offset
)
1073 return nfserr_inval
;
1075 if ((err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_WRITE
, &file
)) != 0)
1077 if (EX_ISSYNC(fhp
->fh_export
)) {
1078 if (file
->f_op
&& file
->f_op
->fsync
) {
1079 err
= nfsd_sync(file
);
1081 err
= nfserr_notsupp
;
1088 #endif /* CONFIG_NFSD_V3 */
1091 * Create a file (regular, directory, device, fifo); UNIX sockets
1092 * not yet implemented.
1093 * If the response fh has been verified, the parent directory should
1094 * already be locked. Note that the parent directory is left locked.
1096 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1099 nfsd_create(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1100 char *fname
, int flen
, struct iattr
*iap
,
1101 int type
, dev_t rdev
, struct svc_fh
*resfhp
)
1103 struct dentry
*dentry
, *dchild
= NULL
;
1111 if (isdotent(fname
, flen
))
1114 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1118 dentry
= fhp
->fh_dentry
;
1119 dirp
= dentry
->d_inode
;
1121 err
= nfserr_notdir
;
1122 if(!dirp
->i_op
|| !dirp
->i_op
->lookup
)
1125 * Check whether the response file handle has been verified yet.
1126 * If it has, the parent directory should already be locked.
1128 if (!resfhp
->fh_dentry
) {
1129 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1131 dchild
= lookup_one_len(fname
, dentry
, flen
);
1132 err
= PTR_ERR(dchild
);
1135 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1139 /* called from nfsd_proc_create */
1140 dchild
= dget(resfhp
->fh_dentry
);
1141 if (!fhp
->fh_locked
) {
1142 /* not actually possible */
1144 "nfsd_create: parent %s/%s not locked!\n",
1145 dentry
->d_parent
->d_name
.name
,
1146 dentry
->d_name
.name
);
1152 * Make sure the child dentry is still negative ...
1155 if (dchild
->d_inode
) {
1156 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1157 dentry
->d_name
.name
, dchild
->d_name
.name
);
1161 if (!(iap
->ia_valid
& ATTR_MODE
))
1163 iap
->ia_mode
= (iap
->ia_mode
& S_IALLUGO
) | type
;
1166 * Get the dir op function pointer.
1171 err
= vfs_create(dirp
, dchild
, iap
->ia_mode
, NULL
);
1174 err
= vfs_mkdir(dirp
, dchild
, iap
->ia_mode
);
1180 err
= vfs_mknod(dirp
, dchild
, iap
->ia_mode
, rdev
);
1183 printk("nfsd: bad file type %o in nfsd_create\n", type
);
1189 if (EX_ISSYNC(fhp
->fh_export
)) {
1190 nfsd_sync_dir(dentry
);
1191 write_inode_now(dchild
->d_inode
, 1);
1195 /* Set file attributes. Mode has already been set and
1196 * setting uid/gid works only for root. Irix appears to
1197 * send along the gid when it tries to implement setgid
1198 * directories via NFS.
1201 if ((iap
->ia_valid
&= ~(ATTR_UID
|ATTR_GID
|ATTR_MODE
)) != 0)
1202 err
= nfsd_setattr(rqstp
, resfhp
, iap
, 0, (time_t)0);
1204 * Update the file handle to get the new inode info.
1207 err
= fh_update(resfhp
);
1209 if (dchild
&& !IS_ERR(dchild
))
1214 err
= nfserrno(err
);
1218 #ifdef CONFIG_NFSD_V3
1220 * NFSv3 version of nfsd_create
1223 nfsd_create_v3(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1224 char *fname
, int flen
, struct iattr
*iap
,
1225 struct svc_fh
*resfhp
, int createmode
, u32
*verifier
,
1228 struct dentry
*dentry
, *dchild
= NULL
;
1231 __u32 v_mtime
=0, v_atime
=0;
1238 if (isdotent(fname
, flen
))
1240 if (!(iap
->ia_valid
& ATTR_MODE
))
1242 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1246 dentry
= fhp
->fh_dentry
;
1247 dirp
= dentry
->d_inode
;
1249 /* Get all the sanity checks out of the way before
1250 * we lock the parent. */
1251 err
= nfserr_notdir
;
1252 if(!dirp
->i_op
|| !dirp
->i_op
->lookup
)
1257 * Compose the response file handle.
1259 dchild
= lookup_one_len(fname
, dentry
, flen
);
1260 err
= PTR_ERR(dchild
);
1264 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1268 if (createmode
== NFS3_CREATE_EXCLUSIVE
) {
1269 /* while the verifier would fit in mtime+atime,
1270 * solaris7 gets confused (bugid 4218508) if these have
1271 * the high bit set, so we use the mode as well
1273 v_mtime
= verifier
[0]&0x7fffffff;
1274 v_atime
= verifier
[1]&0x7fffffff;
1276 | ((verifier
[0]&0x80000000) >> (32-7)) /* u+x */
1277 | ((verifier
[1]&0x80000000) >> (32-9)) /* u+r */
1281 if (dchild
->d_inode
) {
1284 switch (createmode
) {
1285 case NFS3_CREATE_UNCHECKED
:
1286 if (! S_ISREG(dchild
->d_inode
->i_mode
))
1289 /* in nfsv4, we need to treat this case a little
1290 * differently. we don't want to truncate the
1291 * file now; this would be wrong if the OPEN
1292 * fails for some other reason. furthermore,
1293 * if the size is nonzero, we should ignore it
1294 * according to spec!
1296 *truncp
= (iap
->ia_valid
& ATTR_SIZE
) && !iap
->ia_size
;
1299 iap
->ia_valid
&= ATTR_SIZE
;
1303 case NFS3_CREATE_EXCLUSIVE
:
1304 if ( dchild
->d_inode
->i_mtime
.tv_sec
== v_mtime
1305 && dchild
->d_inode
->i_atime
.tv_sec
== v_atime
1306 && dchild
->d_inode
->i_mode
== v_mode
1307 && dchild
->d_inode
->i_size
== 0 )
1310 case NFS3_CREATE_GUARDED
:
1316 err
= vfs_create(dirp
, dchild
, iap
->ia_mode
, NULL
);
1320 if (EX_ISSYNC(fhp
->fh_export
)) {
1321 nfsd_sync_dir(dentry
);
1322 /* setattr will sync the child (or not) */
1326 * Update the filehandle to get the new inode info.
1328 err
= fh_update(resfhp
);
1332 if (createmode
== NFS3_CREATE_EXCLUSIVE
) {
1333 /* Cram the verifier into atime/mtime/mode */
1334 iap
->ia_valid
= ATTR_MTIME
|ATTR_ATIME
1335 | ATTR_MTIME_SET
|ATTR_ATIME_SET
1337 /* XXX someone who knows this better please fix it for nsec */
1338 iap
->ia_mtime
.tv_sec
= v_mtime
;
1339 iap
->ia_atime
.tv_sec
= v_atime
;
1340 iap
->ia_mtime
.tv_nsec
= 0;
1341 iap
->ia_atime
.tv_nsec
= 0;
1342 iap
->ia_mode
= v_mode
;
1345 /* Set file attributes.
1346 * Mode has already been set but we might need to reset it
1347 * for CREATE_EXCLUSIVE
1348 * Irix appears to send along the gid when it tries to
1349 * implement setgid directories via NFS. Clear out all that cruft.
1352 if ((iap
->ia_valid
&= ~(ATTR_UID
|ATTR_GID
)) != 0)
1353 err
= nfsd_setattr(rqstp
, resfhp
, iap
, 0, (time_t)0);
1357 if (dchild
&& !IS_ERR(dchild
))
1362 err
= nfserrno(err
);
1365 #endif /* CONFIG_NFSD_V3 */
1368 * Read a symlink. On entry, *lenp must contain the maximum path length that
1369 * fits into the buffer. On return, it contains the true length.
1370 * N.B. After this call fhp needs an fh_put
1373 nfsd_readlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, char *buf
, int *lenp
)
1375 struct dentry
*dentry
;
1376 struct inode
*inode
;
1380 err
= fh_verify(rqstp
, fhp
, S_IFLNK
, MAY_NOP
);
1384 dentry
= fhp
->fh_dentry
;
1385 inode
= dentry
->d_inode
;
1388 if (!inode
->i_op
|| !inode
->i_op
->readlink
)
1391 touch_atime(fhp
->fh_export
->ex_mnt
, dentry
);
1392 /* N.B. Why does this call need a get_fs()??
1393 * Remove the set_fs and watch the fireworks:-) --okir
1396 oldfs
= get_fs(); set_fs(KERNEL_DS
);
1397 err
= inode
->i_op
->readlink(dentry
, buf
, *lenp
);
1408 err
= nfserrno(err
);
1413 * Create a symlink and look up its inode
1414 * N.B. After this call _both_ fhp and resfhp need an fh_put
1417 nfsd_symlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1418 char *fname
, int flen
,
1419 char *path
, int plen
,
1420 struct svc_fh
*resfhp
,
1423 struct dentry
*dentry
, *dnew
;
1431 if (isdotent(fname
, flen
))
1434 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1438 dentry
= fhp
->fh_dentry
;
1439 dnew
= lookup_one_len(fname
, dentry
, flen
);
1440 err
= PTR_ERR(dnew
);
1445 /* Only the MODE ATTRibute is even vaguely meaningful */
1446 if (iap
&& (iap
->ia_valid
& ATTR_MODE
))
1447 mode
= iap
->ia_mode
& S_IALLUGO
;
1449 if (unlikely(path
[plen
] != 0)) {
1450 char *path_alloced
= kmalloc(plen
+1, GFP_KERNEL
);
1451 if (path_alloced
== NULL
)
1454 strncpy(path_alloced
, path
, plen
);
1455 path_alloced
[plen
] = 0;
1456 err
= vfs_symlink(dentry
->d_inode
, dnew
, path_alloced
, mode
);
1457 kfree(path_alloced
);
1460 err
= vfs_symlink(dentry
->d_inode
, dnew
, path
, mode
);
1463 if (EX_ISSYNC(fhp
->fh_export
))
1464 nfsd_sync_dir(dentry
);
1466 err
= nfserrno(err
);
1469 cerr
= fh_compose(resfhp
, fhp
->fh_export
, dnew
, fhp
);
1471 if (err
==0) err
= cerr
;
1476 err
= nfserrno(err
);
1482 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1485 nfsd_link(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
,
1486 char *name
, int len
, struct svc_fh
*tfhp
)
1488 struct dentry
*ddir
, *dnew
, *dold
;
1489 struct inode
*dirp
, *dest
;
1492 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, MAY_CREATE
);
1495 err
= fh_verify(rqstp
, tfhp
, -S_IFDIR
, MAY_NOP
);
1503 if (isdotent(name
, len
))
1507 ddir
= ffhp
->fh_dentry
;
1508 dirp
= ddir
->d_inode
;
1510 dnew
= lookup_one_len(name
, ddir
, len
);
1511 err
= PTR_ERR(dnew
);
1515 dold
= tfhp
->fh_dentry
;
1516 dest
= dold
->d_inode
;
1518 err
= vfs_link(dold
, dirp
, dnew
);
1520 if (EX_ISSYNC(ffhp
->fh_export
)) {
1521 nfsd_sync_dir(ddir
);
1522 write_inode_now(dest
, 1);
1525 if (err
== -EXDEV
&& rqstp
->rq_vers
== 2)
1528 err
= nfserrno(err
);
1537 err
= nfserrno(err
);
1543 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1546 nfsd_rename(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
, char *fname
, int flen
,
1547 struct svc_fh
*tfhp
, char *tname
, int tlen
)
1549 struct dentry
*fdentry
, *tdentry
, *odentry
, *ndentry
, *trap
;
1550 struct inode
*fdir
, *tdir
;
1553 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, MAY_REMOVE
);
1556 err
= fh_verify(rqstp
, tfhp
, S_IFDIR
, MAY_CREATE
);
1560 fdentry
= ffhp
->fh_dentry
;
1561 fdir
= fdentry
->d_inode
;
1563 tdentry
= tfhp
->fh_dentry
;
1564 tdir
= tdentry
->d_inode
;
1566 err
= (rqstp
->rq_vers
== 2) ? nfserr_acces
: nfserr_xdev
;
1567 if (fdir
->i_sb
!= tdir
->i_sb
)
1571 if (!flen
|| isdotent(fname
, flen
) || !tlen
|| isdotent(tname
, tlen
))
1574 /* cannot use fh_lock as we need deadlock protective ordering
1575 * so do it by hand */
1576 trap
= lock_rename(tdentry
, fdentry
);
1577 ffhp
->fh_locked
= tfhp
->fh_locked
= 1;
1581 odentry
= lookup_one_len(fname
, fdentry
, flen
);
1582 err
= PTR_ERR(odentry
);
1583 if (IS_ERR(odentry
))
1587 if (!odentry
->d_inode
)
1590 if (odentry
== trap
)
1593 ndentry
= lookup_one_len(tname
, tdentry
, tlen
);
1594 err
= PTR_ERR(ndentry
);
1595 if (IS_ERR(ndentry
))
1598 if (ndentry
== trap
)
1602 if ((ffhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
1603 ((atomic_read(&odentry
->d_count
) > 1)
1604 || (atomic_read(&ndentry
->d_count
) > 1))) {
1608 err
= vfs_rename(fdir
, odentry
, tdir
, ndentry
);
1609 if (!err
&& EX_ISSYNC(tfhp
->fh_export
)) {
1610 nfsd_sync_dir(tdentry
);
1611 nfsd_sync_dir(fdentry
);
1620 err
= nfserrno(err
);
1622 /* we cannot reply on fh_unlock on the two filehandles,
1623 * as that would do the wrong thing if the two directories
1624 * were the same, so again we do it by hand
1626 fill_post_wcc(ffhp
);
1627 fill_post_wcc(tfhp
);
1628 unlock_rename(tdentry
, fdentry
);
1629 ffhp
->fh_locked
= tfhp
->fh_locked
= 0;
1636 * Unlink a file or directory
1637 * N.B. After this call fhp needs an fh_put
1640 nfsd_unlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, int type
,
1641 char *fname
, int flen
)
1643 struct dentry
*dentry
, *rdentry
;
1648 if (!flen
|| isdotent(fname
, flen
))
1650 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_REMOVE
);
1655 dentry
= fhp
->fh_dentry
;
1656 dirp
= dentry
->d_inode
;
1658 rdentry
= lookup_one_len(fname
, dentry
, flen
);
1659 err
= PTR_ERR(rdentry
);
1660 if (IS_ERR(rdentry
))
1663 if (!rdentry
->d_inode
) {
1670 type
= rdentry
->d_inode
->i_mode
& S_IFMT
;
1672 if (type
!= S_IFDIR
) { /* It's UNLINK */
1674 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
1675 (atomic_read(&rdentry
->d_count
) > 1)) {
1679 err
= vfs_unlink(dirp
, rdentry
);
1680 } else { /* It's RMDIR */
1681 err
= vfs_rmdir(dirp
, rdentry
);
1688 if (EX_ISSYNC(fhp
->fh_export
))
1689 nfsd_sync_dir(dentry
);
1695 err
= nfserrno(err
);
1700 * Read entries from a directory.
1701 * The NFSv3/4 verifier we ignore for now.
1704 nfsd_readdir(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, loff_t
*offsetp
,
1705 struct readdir_cd
*cdp
, encode_dent_fn func
)
1709 loff_t offset
= *offsetp
;
1711 err
= nfsd_open(rqstp
, fhp
, S_IFDIR
, MAY_READ
, &file
);
1715 offset
= vfs_llseek(file
, offset
, 0);
1717 err
= nfserrno((int)offset
);
1722 * Read the directory entries. This silly loop is necessary because
1723 * readdir() is not guaranteed to fill up the entire buffer, but
1724 * may choose to do less.
1728 cdp
->err
= nfserr_eof
; /* will be cleared on successful read */
1729 err
= vfs_readdir(file
, (filldir_t
) func
, cdp
);
1730 } while (err
>=0 && cdp
->err
== nfs_ok
);
1732 err
= nfserrno(err
);
1735 *offsetp
= vfs_llseek(file
, 0, 1);
1737 if (err
== nfserr_eof
|| err
== nfserr_toosmall
)
1738 err
= nfs_ok
; /* can still be found in ->err */
1746 * Get file system stats
1747 * N.B. After this call fhp needs an fh_put
1750 nfsd_statfs(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct kstatfs
*stat
)
1752 int err
= fh_verify(rqstp
, fhp
, 0, MAY_NOP
);
1753 if (!err
&& vfs_statfs(fhp
->fh_dentry
->d_inode
->i_sb
,stat
))
1759 * Check for a user's access permissions to this inode.
1762 nfsd_permission(struct svc_export
*exp
, struct dentry
*dentry
, int acc
)
1764 struct inode
*inode
= dentry
->d_inode
;
1770 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
1772 (acc
& MAY_READ
)? " read" : "",
1773 (acc
& MAY_WRITE
)? " write" : "",
1774 (acc
& MAY_EXEC
)? " exec" : "",
1775 (acc
& MAY_SATTR
)? " sattr" : "",
1776 (acc
& MAY_TRUNC
)? " trunc" : "",
1777 (acc
& MAY_LOCK
)? " lock" : "",
1778 (acc
& MAY_OWNER_OVERRIDE
)? " owneroverride" : "",
1780 IS_IMMUTABLE(inode
)? " immut" : "",
1781 IS_APPEND(inode
)? " append" : "",
1782 IS_RDONLY(inode
)? " ro" : "");
1783 dprintk(" owner %d/%d user %d/%d\n",
1784 inode
->i_uid
, inode
->i_gid
, current
->fsuid
, current
->fsgid
);
1787 /* Normally we reject any write/sattr etc access on a read-only file
1788 * system. But if it is IRIX doing check on write-access for a
1789 * device special file, we ignore rofs.
1791 if (!(acc
& MAY_LOCAL_ACCESS
))
1792 if (acc
& (MAY_WRITE
| MAY_SATTR
| MAY_TRUNC
)) {
1793 if (EX_RDONLY(exp
) || IS_RDONLY(inode
))
1795 if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode
))
1798 if ((acc
& MAY_TRUNC
) && IS_APPEND(inode
))
1801 if (acc
& MAY_LOCK
) {
1802 /* If we cannot rely on authentication in NLM requests,
1803 * just allow locks, otherwise require read permission, or
1806 if (exp
->ex_flags
& NFSEXP_NOAUTHNLM
)
1809 acc
= MAY_READ
| MAY_OWNER_OVERRIDE
;
1812 * The file owner always gets access permission for accesses that
1813 * would normally be checked at open time. This is to make
1814 * file access work even when the client has done a fchmod(fd, 0).
1816 * However, `cp foo bar' should fail nevertheless when bar is
1817 * readonly. A sensible way to do this might be to reject all
1818 * attempts to truncate a read-only file, because a creat() call
1819 * always implies file truncation.
1820 * ... but this isn't really fair. A process may reasonably call
1821 * ftruncate on an open file descriptor on a file with perm 000.
1822 * We must trust the client to do permission checking - using "ACCESS"
1825 if ((acc
& MAY_OWNER_OVERRIDE
) &&
1826 inode
->i_uid
== current
->fsuid
)
1829 err
= permission(inode
, acc
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
), NULL
);
1831 /* Allow read access to binaries even when mode 111 */
1832 if (err
== -EACCES
&& S_ISREG(inode
->i_mode
) &&
1833 acc
== (MAY_READ
| MAY_OWNER_OVERRIDE
))
1834 err
= permission(inode
, MAY_EXEC
, NULL
);
1836 return err
? nfserrno(err
) : 0;
1840 nfsd_racache_shutdown(void)
1844 dprintk("nfsd: freeing readahead buffers.\n");
1846 raparm_cache
= raparml
= NULL
;
1849 * Initialize readahead param cache
1852 nfsd_racache_init(int cache_size
)
1858 raparml
= kmalloc(sizeof(struct raparms
) * cache_size
, GFP_KERNEL
);
1860 if (raparml
!= NULL
) {
1861 dprintk("nfsd: allocating %d readahead buffers.\n",
1863 memset(raparml
, 0, sizeof(struct raparms
) * cache_size
);
1864 for (i
= 0; i
< cache_size
- 1; i
++) {
1865 raparml
[i
].p_next
= raparml
+ i
+ 1;
1867 raparm_cache
= raparml
;
1870 "nfsd: Could not allocate memory read-ahead cache.\n");
1873 nfsdstats
.ra_size
= cache_size
;
1877 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
1879 nfsd_get_posix_acl(struct svc_fh
*fhp
, int type
)
1881 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
1885 struct posix_acl
*acl
;
1887 if (!IS_POSIXACL(inode
) || !inode
->i_op
|| !inode
->i_op
->getxattr
)
1888 return ERR_PTR(-EOPNOTSUPP
);
1890 case ACL_TYPE_ACCESS
:
1891 name
= POSIX_ACL_XATTR_ACCESS
;
1893 case ACL_TYPE_DEFAULT
:
1894 name
= POSIX_ACL_XATTR_DEFAULT
;
1897 return ERR_PTR(-EOPNOTSUPP
);
1900 size
= inode
->i_op
->getxattr(fhp
->fh_dentry
, name
, NULL
, 0);
1903 acl
= ERR_PTR(size
);
1905 } else if (size
> 0) {
1906 value
= kmalloc(size
, GFP_KERNEL
);
1908 acl
= ERR_PTR(-ENOMEM
);
1911 size
= inode
->i_op
->getxattr(fhp
->fh_dentry
, name
, value
, size
);
1913 acl
= ERR_PTR(size
);
1917 acl
= posix_acl_from_xattr(value
, size
);
1925 nfsd_set_posix_acl(struct svc_fh
*fhp
, int type
, struct posix_acl
*acl
)
1927 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
1933 if (!IS_POSIXACL(inode
) || !inode
->i_op
||
1934 !inode
->i_op
->setxattr
|| !inode
->i_op
->removexattr
)
1937 case ACL_TYPE_ACCESS
:
1938 name
= POSIX_ACL_XATTR_ACCESS
;
1940 case ACL_TYPE_DEFAULT
:
1941 name
= POSIX_ACL_XATTR_DEFAULT
;
1947 if (acl
&& acl
->a_count
) {
1948 size
= posix_acl_xattr_size(acl
->a_count
);
1949 value
= kmalloc(size
, GFP_KERNEL
);
1952 size
= posix_acl_to_xattr(acl
, value
, size
);
1960 if (!fhp
->fh_locked
)
1961 fh_lock(fhp
); /* unlocking is done automatically */
1963 error
= inode
->i_op
->setxattr(fhp
->fh_dentry
, name
,
1966 if (!S_ISDIR(inode
->i_mode
) && type
== ACL_TYPE_DEFAULT
)
1969 error
= inode
->i_op
->removexattr(fhp
->fh_dentry
, name
);
1970 if (error
== -ENODATA
)
1979 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */