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 flags
= O_WRONLY
|O_LARGEFILE
;
680 *filp
= dentry_open(dget(dentry
), mntget(fhp
->fh_export
->ex_mnt
), flags
);
682 err
= PTR_ERR(*filp
);
694 nfsd_close(struct file
*filp
)
701 * As this calls fsync (not fdatasync) there is no need for a write_inode
704 static inline int nfsd_dosync(struct file
*filp
, struct dentry
*dp
,
705 const struct file_operations
*fop
)
707 struct inode
*inode
= dp
->d_inode
;
708 int (*fsync
) (struct file
*, struct dentry
*, int);
711 err
= filemap_fdatawrite(inode
->i_mapping
);
712 if (err
== 0 && fop
&& (fsync
= fop
->fsync
))
713 err
= fsync(filp
, dp
, 0);
715 err
= filemap_fdatawait(inode
->i_mapping
);
722 nfsd_sync(struct file
*filp
)
725 struct inode
*inode
= filp
->f_dentry
->d_inode
;
726 dprintk("nfsd: sync file %s\n", filp
->f_dentry
->d_name
.name
);
727 mutex_lock(&inode
->i_mutex
);
728 err
=nfsd_dosync(filp
, filp
->f_dentry
, filp
->f_op
);
729 mutex_unlock(&inode
->i_mutex
);
735 nfsd_sync_dir(struct dentry
*dp
)
737 return nfsd_dosync(NULL
, dp
, dp
->d_inode
->i_fop
);
741 * Obtain the readahead parameters for the file
742 * specified by (dev, ino).
744 static DEFINE_SPINLOCK(ra_lock
);
746 static inline struct raparms
*
747 nfsd_get_raparms(dev_t dev
, ino_t ino
)
749 struct raparms
*ra
, **rap
, **frap
= NULL
;
753 for (rap
= &raparm_cache
; (ra
= *rap
); rap
= &ra
->p_next
) {
754 if (ra
->p_ino
== ino
&& ra
->p_dev
== dev
)
757 if (ra
->p_count
== 0)
760 depth
= nfsdstats
.ra_size
*11/10;
762 spin_unlock(&ra_lock
);
771 if (rap
!= &raparm_cache
) {
773 ra
->p_next
= raparm_cache
;
777 nfsdstats
.ra_depth
[depth
*10/nfsdstats
.ra_size
]++;
778 spin_unlock(&ra_lock
);
783 * Grab and keep cached pages assosiated with a file in the svc_rqst
784 * so that they can be passed to the netowork sendmsg/sendpage routines
785 * directrly. They will be released after the sending has completed.
788 nfsd_read_actor(read_descriptor_t
*desc
, struct page
*page
, unsigned long offset
, unsigned long size
)
790 unsigned long count
= desc
->count
;
791 struct svc_rqst
*rqstp
= desc
->arg
.data
;
796 if (rqstp
->rq_res
.page_len
== 0) {
798 rqstp
->rq_respages
[rqstp
->rq_resused
++] = page
;
799 rqstp
->rq_res
.page_base
= offset
;
800 rqstp
->rq_res
.page_len
= size
;
801 } else if (page
!= rqstp
->rq_respages
[rqstp
->rq_resused
-1]) {
803 rqstp
->rq_respages
[rqstp
->rq_resused
++] = page
;
804 rqstp
->rq_res
.page_len
+= size
;
806 rqstp
->rq_res
.page_len
+= size
;
809 desc
->count
= count
- size
;
810 desc
->written
+= size
;
815 nfsd_vfs_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
816 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long *count
)
824 inode
= file
->f_dentry
->d_inode
;
826 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
827 (!lock_may_read(inode
, offset
, *count
)))
831 /* Get readahead parameters */
832 ra
= nfsd_get_raparms(inode
->i_sb
->s_dev
, inode
->i_ino
);
835 file
->f_ra
= ra
->p_ra
;
837 if (file
->f_op
->sendfile
) {
838 svc_pushback_unused_pages(rqstp
);
839 err
= file
->f_op
->sendfile(file
, &offset
, *count
,
840 nfsd_read_actor
, rqstp
);
844 err
= vfs_readv(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
848 /* Write back readahead params */
851 ra
->p_ra
= file
->f_ra
;
854 spin_unlock(&ra_lock
);
858 nfsdstats
.io_read
+= err
;
861 fsnotify_access(file
->f_dentry
);
868 static void kill_suid(struct dentry
*dentry
)
871 ia
.ia_valid
= ATTR_KILL_SUID
| ATTR_KILL_SGID
;
873 mutex_lock(&dentry
->d_inode
->i_mutex
);
874 notify_change(dentry
, &ia
);
875 mutex_unlock(&dentry
->d_inode
->i_mutex
);
879 nfsd_vfs_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
880 loff_t offset
, struct kvec
*vec
, int vlen
,
881 unsigned long cnt
, int *stablep
)
883 struct svc_export
*exp
;
884 struct dentry
*dentry
;
888 int stable
= *stablep
;
893 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
894 (!lock_may_write(file
->f_dentry
->d_inode
, offset
, cnt
)))
898 dentry
= file
->f_dentry
;
899 inode
= dentry
->d_inode
;
900 exp
= fhp
->fh_export
;
903 * Request sync writes if
904 * - the sync export option has been set, or
905 * - the client requested O_SYNC behavior (NFSv3 feature).
906 * - The file system doesn't support fsync().
907 * When gathered writes have been configured for this volume,
908 * flushing the data to disk is handled separately below.
911 if (file
->f_op
->fsync
== 0) {/* COMMIT3 cannot work */
913 *stablep
= 2; /* FILE_SYNC */
918 if (stable
&& !EX_WGATHER(exp
))
919 file
->f_flags
|= O_SYNC
;
921 /* Write the data. */
922 oldfs
= get_fs(); set_fs(KERNEL_DS
);
923 err
= vfs_writev(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
926 nfsdstats
.io_write
+= cnt
;
927 fsnotify_modify(file
->f_dentry
);
930 /* clear setuid/setgid flag after write */
931 if (err
>= 0 && (inode
->i_mode
& (S_ISUID
| S_ISGID
)))
934 if (err
>= 0 && stable
) {
935 static ino_t last_ino
;
936 static dev_t last_dev
;
939 * Gathered writes: If another process is currently
940 * writing to the file, there's a high chance
941 * this is another nfsd (triggered by a bulk write
942 * from a client's biod). Rather than syncing the
943 * file with each write request, we sleep for 10 msec.
945 * I don't know if this roughly approximates
946 * C. Juszak's idea of gathered writes, but it's a
947 * nice and simple solution (IMHO), and it seems to
950 if (EX_WGATHER(exp
)) {
951 if (atomic_read(&inode
->i_writecount
) > 1
952 || (last_ino
== inode
->i_ino
&& last_dev
== inode
->i_sb
->s_dev
)) {
953 dprintk("nfsd: write defer %d\n", current
->pid
);
955 dprintk("nfsd: write resume %d\n", current
->pid
);
958 if (inode
->i_state
& I_DIRTY
) {
959 dprintk("nfsd: write sync %d\n", current
->pid
);
963 wake_up(&inode
->i_wait
);
966 last_ino
= inode
->i_ino
;
967 last_dev
= inode
->i_sb
->s_dev
;
970 dprintk("nfsd: write complete err=%d\n", err
);
980 * Read data from a file. count must contain the requested read count
981 * on entry. On return, *count contains the number of bytes actually read.
982 * N.B. After this call fhp needs an fh_put
985 nfsd_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
986 loff_t offset
, struct kvec
*vec
, int vlen
,
987 unsigned long *count
)
992 err
= nfsd_permission(fhp
->fh_export
, fhp
->fh_dentry
,
993 MAY_READ
|MAY_OWNER_OVERRIDE
);
996 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
998 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_READ
, &file
);
1001 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
1009 * Write data to a file.
1010 * The stable flag requests synchronous writes.
1011 * N.B. After this call fhp needs an fh_put
1014 nfsd_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1015 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long cnt
,
1021 err
= nfsd_permission(fhp
->fh_export
, fhp
->fh_dentry
,
1022 MAY_WRITE
|MAY_OWNER_OVERRIDE
);
1025 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
, cnt
,
1028 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_WRITE
, &file
);
1033 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
,
1041 #ifdef CONFIG_NFSD_V3
1043 * Commit all pending writes to stable storage.
1044 * Strictly speaking, we could sync just the indicated file region here,
1045 * but there's currently no way we can ask the VFS to do so.
1047 * Unfortunately we cannot lock the file to make sure we return full WCC
1048 * data to the client, as locking happens lower down in the filesystem.
1051 nfsd_commit(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1052 loff_t offset
, unsigned long count
)
1057 if ((u64
)count
> ~(u64
)offset
)
1058 return nfserr_inval
;
1060 if ((err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_WRITE
, &file
)) != 0)
1062 if (EX_ISSYNC(fhp
->fh_export
)) {
1063 if (file
->f_op
&& file
->f_op
->fsync
) {
1064 err
= nfserrno(nfsd_sync(file
));
1066 err
= nfserr_notsupp
;
1073 #endif /* CONFIG_NFSD_V3 */
1076 * Create a file (regular, directory, device, fifo); UNIX sockets
1077 * not yet implemented.
1078 * If the response fh has been verified, the parent directory should
1079 * already be locked. Note that the parent directory is left locked.
1081 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1084 nfsd_create(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1085 char *fname
, int flen
, struct iattr
*iap
,
1086 int type
, dev_t rdev
, struct svc_fh
*resfhp
)
1088 struct dentry
*dentry
, *dchild
= NULL
;
1096 if (isdotent(fname
, flen
))
1099 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1103 dentry
= fhp
->fh_dentry
;
1104 dirp
= dentry
->d_inode
;
1106 err
= nfserr_notdir
;
1107 if(!dirp
->i_op
|| !dirp
->i_op
->lookup
)
1110 * Check whether the response file handle has been verified yet.
1111 * If it has, the parent directory should already be locked.
1113 if (!resfhp
->fh_dentry
) {
1114 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1116 dchild
= lookup_one_len(fname
, dentry
, flen
);
1117 err
= PTR_ERR(dchild
);
1120 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1124 /* called from nfsd_proc_create */
1125 dchild
= dget(resfhp
->fh_dentry
);
1126 if (!fhp
->fh_locked
) {
1127 /* not actually possible */
1129 "nfsd_create: parent %s/%s not locked!\n",
1130 dentry
->d_parent
->d_name
.name
,
1131 dentry
->d_name
.name
);
1137 * Make sure the child dentry is still negative ...
1140 if (dchild
->d_inode
) {
1141 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1142 dentry
->d_name
.name
, dchild
->d_name
.name
);
1146 if (!(iap
->ia_valid
& ATTR_MODE
))
1148 iap
->ia_mode
= (iap
->ia_mode
& S_IALLUGO
) | type
;
1151 * Get the dir op function pointer.
1156 err
= vfs_create(dirp
, dchild
, iap
->ia_mode
, NULL
);
1159 err
= vfs_mkdir(dirp
, dchild
, iap
->ia_mode
);
1165 err
= vfs_mknod(dirp
, dchild
, iap
->ia_mode
, rdev
);
1168 printk("nfsd: bad file type %o in nfsd_create\n", type
);
1174 if (EX_ISSYNC(fhp
->fh_export
)) {
1175 err
= nfserrno(nfsd_sync_dir(dentry
));
1176 write_inode_now(dchild
->d_inode
, 1);
1180 /* Set file attributes. Mode has already been set and
1181 * setting uid/gid works only for root. Irix appears to
1182 * send along the gid when it tries to implement setgid
1183 * directories via NFS.
1185 if ((iap
->ia_valid
&= ~(ATTR_UID
|ATTR_GID
|ATTR_MODE
)) != 0) {
1186 int err2
= nfsd_setattr(rqstp
, resfhp
, iap
, 0, (time_t)0);
1191 * Update the file handle to get the new inode info.
1194 err
= fh_update(resfhp
);
1196 if (dchild
&& !IS_ERR(dchild
))
1201 err
= nfserrno(err
);
1205 #ifdef CONFIG_NFSD_V3
1207 * NFSv3 version of nfsd_create
1210 nfsd_create_v3(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1211 char *fname
, int flen
, struct iattr
*iap
,
1212 struct svc_fh
*resfhp
, int createmode
, u32
*verifier
,
1215 struct dentry
*dentry
, *dchild
= NULL
;
1218 __u32 v_mtime
=0, v_atime
=0;
1225 if (isdotent(fname
, flen
))
1227 if (!(iap
->ia_valid
& ATTR_MODE
))
1229 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1233 dentry
= fhp
->fh_dentry
;
1234 dirp
= dentry
->d_inode
;
1236 /* Get all the sanity checks out of the way before
1237 * we lock the parent. */
1238 err
= nfserr_notdir
;
1239 if(!dirp
->i_op
|| !dirp
->i_op
->lookup
)
1244 * Compose the response file handle.
1246 dchild
= lookup_one_len(fname
, dentry
, flen
);
1247 err
= PTR_ERR(dchild
);
1251 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1255 if (createmode
== NFS3_CREATE_EXCLUSIVE
) {
1256 /* while the verifier would fit in mtime+atime,
1257 * solaris7 gets confused (bugid 4218508) if these have
1258 * the high bit set, so we use the mode as well
1260 v_mtime
= verifier
[0]&0x7fffffff;
1261 v_atime
= verifier
[1]&0x7fffffff;
1263 | ((verifier
[0]&0x80000000) >> (32-7)) /* u+x */
1264 | ((verifier
[1]&0x80000000) >> (32-9)) /* u+r */
1268 if (dchild
->d_inode
) {
1271 switch (createmode
) {
1272 case NFS3_CREATE_UNCHECKED
:
1273 if (! S_ISREG(dchild
->d_inode
->i_mode
))
1276 /* in nfsv4, we need to treat this case a little
1277 * differently. we don't want to truncate the
1278 * file now; this would be wrong if the OPEN
1279 * fails for some other reason. furthermore,
1280 * if the size is nonzero, we should ignore it
1281 * according to spec!
1283 *truncp
= (iap
->ia_valid
& ATTR_SIZE
) && !iap
->ia_size
;
1286 iap
->ia_valid
&= ATTR_SIZE
;
1290 case NFS3_CREATE_EXCLUSIVE
:
1291 if ( dchild
->d_inode
->i_mtime
.tv_sec
== v_mtime
1292 && dchild
->d_inode
->i_atime
.tv_sec
== v_atime
1293 && dchild
->d_inode
->i_mode
== v_mode
1294 && dchild
->d_inode
->i_size
== 0 )
1297 case NFS3_CREATE_GUARDED
:
1303 err
= vfs_create(dirp
, dchild
, iap
->ia_mode
, NULL
);
1307 if (EX_ISSYNC(fhp
->fh_export
)) {
1308 err
= nfserrno(nfsd_sync_dir(dentry
));
1309 /* setattr will sync the child (or not) */
1312 if (createmode
== NFS3_CREATE_EXCLUSIVE
) {
1313 /* Cram the verifier into atime/mtime/mode */
1314 iap
->ia_valid
= ATTR_MTIME
|ATTR_ATIME
1315 | ATTR_MTIME_SET
|ATTR_ATIME_SET
1317 /* XXX someone who knows this better please fix it for nsec */
1318 iap
->ia_mtime
.tv_sec
= v_mtime
;
1319 iap
->ia_atime
.tv_sec
= v_atime
;
1320 iap
->ia_mtime
.tv_nsec
= 0;
1321 iap
->ia_atime
.tv_nsec
= 0;
1322 iap
->ia_mode
= v_mode
;
1325 /* Set file attributes.
1326 * Mode has already been set but we might need to reset it
1327 * for CREATE_EXCLUSIVE
1328 * Irix appears to send along the gid when it tries to
1329 * implement setgid directories via NFS. Clear out all that cruft.
1332 if ((iap
->ia_valid
&= ~(ATTR_UID
|ATTR_GID
)) != 0) {
1333 int err2
= nfsd_setattr(rqstp
, resfhp
, iap
, 0, (time_t)0);
1339 * Update the filehandle to get the new inode info.
1342 err
= fh_update(resfhp
);
1346 if (dchild
&& !IS_ERR(dchild
))
1351 err
= nfserrno(err
);
1354 #endif /* CONFIG_NFSD_V3 */
1357 * Read a symlink. On entry, *lenp must contain the maximum path length that
1358 * fits into the buffer. On return, it contains the true length.
1359 * N.B. After this call fhp needs an fh_put
1362 nfsd_readlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, char *buf
, int *lenp
)
1364 struct dentry
*dentry
;
1365 struct inode
*inode
;
1369 err
= fh_verify(rqstp
, fhp
, S_IFLNK
, MAY_NOP
);
1373 dentry
= fhp
->fh_dentry
;
1374 inode
= dentry
->d_inode
;
1377 if (!inode
->i_op
|| !inode
->i_op
->readlink
)
1380 touch_atime(fhp
->fh_export
->ex_mnt
, dentry
);
1381 /* N.B. Why does this call need a get_fs()??
1382 * Remove the set_fs and watch the fireworks:-) --okir
1385 oldfs
= get_fs(); set_fs(KERNEL_DS
);
1386 err
= inode
->i_op
->readlink(dentry
, buf
, *lenp
);
1397 err
= nfserrno(err
);
1402 * Create a symlink and look up its inode
1403 * N.B. After this call _both_ fhp and resfhp need an fh_put
1406 nfsd_symlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1407 char *fname
, int flen
,
1408 char *path
, int plen
,
1409 struct svc_fh
*resfhp
,
1412 struct dentry
*dentry
, *dnew
;
1420 if (isdotent(fname
, flen
))
1423 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1427 dentry
= fhp
->fh_dentry
;
1428 dnew
= lookup_one_len(fname
, dentry
, flen
);
1429 err
= PTR_ERR(dnew
);
1434 /* Only the MODE ATTRibute is even vaguely meaningful */
1435 if (iap
&& (iap
->ia_valid
& ATTR_MODE
))
1436 mode
= iap
->ia_mode
& S_IALLUGO
;
1438 if (unlikely(path
[plen
] != 0)) {
1439 char *path_alloced
= kmalloc(plen
+1, GFP_KERNEL
);
1440 if (path_alloced
== NULL
)
1443 strncpy(path_alloced
, path
, plen
);
1444 path_alloced
[plen
] = 0;
1445 err
= vfs_symlink(dentry
->d_inode
, dnew
, path_alloced
, mode
);
1446 kfree(path_alloced
);
1449 err
= vfs_symlink(dentry
->d_inode
, dnew
, path
, mode
);
1452 if (EX_ISSYNC(fhp
->fh_export
))
1453 err
= nfsd_sync_dir(dentry
);
1455 err
= nfserrno(err
);
1458 cerr
= fh_compose(resfhp
, fhp
->fh_export
, dnew
, fhp
);
1460 if (err
==0) err
= cerr
;
1465 err
= nfserrno(err
);
1471 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1474 nfsd_link(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
,
1475 char *name
, int len
, struct svc_fh
*tfhp
)
1477 struct dentry
*ddir
, *dnew
, *dold
;
1478 struct inode
*dirp
, *dest
;
1481 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, MAY_CREATE
);
1484 err
= fh_verify(rqstp
, tfhp
, -S_IFDIR
, MAY_NOP
);
1492 if (isdotent(name
, len
))
1496 ddir
= ffhp
->fh_dentry
;
1497 dirp
= ddir
->d_inode
;
1499 dnew
= lookup_one_len(name
, ddir
, len
);
1500 err
= PTR_ERR(dnew
);
1504 dold
= tfhp
->fh_dentry
;
1505 dest
= dold
->d_inode
;
1507 err
= vfs_link(dold
, dirp
, dnew
);
1509 if (EX_ISSYNC(ffhp
->fh_export
)) {
1510 err
= nfserrno(nfsd_sync_dir(ddir
));
1511 write_inode_now(dest
, 1);
1514 if (err
== -EXDEV
&& rqstp
->rq_vers
== 2)
1517 err
= nfserrno(err
);
1526 err
= nfserrno(err
);
1532 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1535 nfsd_rename(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
, char *fname
, int flen
,
1536 struct svc_fh
*tfhp
, char *tname
, int tlen
)
1538 struct dentry
*fdentry
, *tdentry
, *odentry
, *ndentry
, *trap
;
1539 struct inode
*fdir
, *tdir
;
1542 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, MAY_REMOVE
);
1545 err
= fh_verify(rqstp
, tfhp
, S_IFDIR
, MAY_CREATE
);
1549 fdentry
= ffhp
->fh_dentry
;
1550 fdir
= fdentry
->d_inode
;
1552 tdentry
= tfhp
->fh_dentry
;
1553 tdir
= tdentry
->d_inode
;
1555 err
= (rqstp
->rq_vers
== 2) ? nfserr_acces
: nfserr_xdev
;
1556 if (ffhp
->fh_export
!= tfhp
->fh_export
)
1560 if (!flen
|| isdotent(fname
, flen
) || !tlen
|| isdotent(tname
, tlen
))
1563 /* cannot use fh_lock as we need deadlock protective ordering
1564 * so do it by hand */
1565 trap
= lock_rename(tdentry
, fdentry
);
1566 ffhp
->fh_locked
= tfhp
->fh_locked
= 1;
1570 odentry
= lookup_one_len(fname
, fdentry
, flen
);
1571 err
= PTR_ERR(odentry
);
1572 if (IS_ERR(odentry
))
1576 if (!odentry
->d_inode
)
1579 if (odentry
== trap
)
1582 ndentry
= lookup_one_len(tname
, tdentry
, tlen
);
1583 err
= PTR_ERR(ndentry
);
1584 if (IS_ERR(ndentry
))
1587 if (ndentry
== trap
)
1591 if ((ffhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
1592 ((atomic_read(&odentry
->d_count
) > 1)
1593 || (atomic_read(&ndentry
->d_count
) > 1))) {
1597 err
= vfs_rename(fdir
, odentry
, tdir
, ndentry
);
1598 if (!err
&& EX_ISSYNC(tfhp
->fh_export
)) {
1599 err
= nfsd_sync_dir(tdentry
);
1601 err
= nfsd_sync_dir(fdentry
);
1610 err
= nfserrno(err
);
1612 /* we cannot reply on fh_unlock on the two filehandles,
1613 * as that would do the wrong thing if the two directories
1614 * were the same, so again we do it by hand
1616 fill_post_wcc(ffhp
);
1617 fill_post_wcc(tfhp
);
1618 unlock_rename(tdentry
, fdentry
);
1619 ffhp
->fh_locked
= tfhp
->fh_locked
= 0;
1626 * Unlink a file or directory
1627 * N.B. After this call fhp needs an fh_put
1630 nfsd_unlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, int type
,
1631 char *fname
, int flen
)
1633 struct dentry
*dentry
, *rdentry
;
1638 if (!flen
|| isdotent(fname
, flen
))
1640 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_REMOVE
);
1645 dentry
= fhp
->fh_dentry
;
1646 dirp
= dentry
->d_inode
;
1648 rdentry
= lookup_one_len(fname
, dentry
, flen
);
1649 err
= PTR_ERR(rdentry
);
1650 if (IS_ERR(rdentry
))
1653 if (!rdentry
->d_inode
) {
1660 type
= rdentry
->d_inode
->i_mode
& S_IFMT
;
1662 if (type
!= S_IFDIR
) { /* It's UNLINK */
1664 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
1665 (atomic_read(&rdentry
->d_count
) > 1)) {
1669 err
= vfs_unlink(dirp
, rdentry
);
1670 } else { /* It's RMDIR */
1671 err
= vfs_rmdir(dirp
, rdentry
);
1677 EX_ISSYNC(fhp
->fh_export
))
1678 err
= nfsd_sync_dir(dentry
);
1681 err
= nfserrno(err
);
1687 * Read entries from a directory.
1688 * The NFSv3/4 verifier we ignore for now.
1691 nfsd_readdir(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, loff_t
*offsetp
,
1692 struct readdir_cd
*cdp
, encode_dent_fn func
)
1696 loff_t offset
= *offsetp
;
1698 err
= nfsd_open(rqstp
, fhp
, S_IFDIR
, MAY_READ
, &file
);
1702 offset
= vfs_llseek(file
, offset
, 0);
1704 err
= nfserrno((int)offset
);
1709 * Read the directory entries. This silly loop is necessary because
1710 * readdir() is not guaranteed to fill up the entire buffer, but
1711 * may choose to do less.
1715 cdp
->err
= nfserr_eof
; /* will be cleared on successful read */
1716 err
= vfs_readdir(file
, (filldir_t
) func
, cdp
);
1717 } while (err
>=0 && cdp
->err
== nfs_ok
);
1719 err
= nfserrno(err
);
1722 *offsetp
= vfs_llseek(file
, 0, 1);
1724 if (err
== nfserr_eof
|| err
== nfserr_toosmall
)
1725 err
= nfs_ok
; /* can still be found in ->err */
1733 * Get file system stats
1734 * N.B. After this call fhp needs an fh_put
1737 nfsd_statfs(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct kstatfs
*stat
)
1739 int err
= fh_verify(rqstp
, fhp
, 0, MAY_NOP
);
1740 if (!err
&& vfs_statfs(fhp
->fh_dentry
,stat
))
1746 * Check for a user's access permissions to this inode.
1749 nfsd_permission(struct svc_export
*exp
, struct dentry
*dentry
, int acc
)
1751 struct inode
*inode
= dentry
->d_inode
;
1757 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
1759 (acc
& MAY_READ
)? " read" : "",
1760 (acc
& MAY_WRITE
)? " write" : "",
1761 (acc
& MAY_EXEC
)? " exec" : "",
1762 (acc
& MAY_SATTR
)? " sattr" : "",
1763 (acc
& MAY_TRUNC
)? " trunc" : "",
1764 (acc
& MAY_LOCK
)? " lock" : "",
1765 (acc
& MAY_OWNER_OVERRIDE
)? " owneroverride" : "",
1767 IS_IMMUTABLE(inode
)? " immut" : "",
1768 IS_APPEND(inode
)? " append" : "",
1769 IS_RDONLY(inode
)? " ro" : "");
1770 dprintk(" owner %d/%d user %d/%d\n",
1771 inode
->i_uid
, inode
->i_gid
, current
->fsuid
, current
->fsgid
);
1774 /* Normally we reject any write/sattr etc access on a read-only file
1775 * system. But if it is IRIX doing check on write-access for a
1776 * device special file, we ignore rofs.
1778 if (!(acc
& MAY_LOCAL_ACCESS
))
1779 if (acc
& (MAY_WRITE
| MAY_SATTR
| MAY_TRUNC
)) {
1780 if (EX_RDONLY(exp
) || IS_RDONLY(inode
))
1782 if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode
))
1785 if ((acc
& MAY_TRUNC
) && IS_APPEND(inode
))
1788 if (acc
& MAY_LOCK
) {
1789 /* If we cannot rely on authentication in NLM requests,
1790 * just allow locks, otherwise require read permission, or
1793 if (exp
->ex_flags
& NFSEXP_NOAUTHNLM
)
1796 acc
= MAY_READ
| MAY_OWNER_OVERRIDE
;
1799 * The file owner always gets access permission for accesses that
1800 * would normally be checked at open time. This is to make
1801 * file access work even when the client has done a fchmod(fd, 0).
1803 * However, `cp foo bar' should fail nevertheless when bar is
1804 * readonly. A sensible way to do this might be to reject all
1805 * attempts to truncate a read-only file, because a creat() call
1806 * always implies file truncation.
1807 * ... but this isn't really fair. A process may reasonably call
1808 * ftruncate on an open file descriptor on a file with perm 000.
1809 * We must trust the client to do permission checking - using "ACCESS"
1812 if ((acc
& MAY_OWNER_OVERRIDE
) &&
1813 inode
->i_uid
== current
->fsuid
)
1816 err
= permission(inode
, acc
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
), NULL
);
1818 /* Allow read access to binaries even when mode 111 */
1819 if (err
== -EACCES
&& S_ISREG(inode
->i_mode
) &&
1820 acc
== (MAY_READ
| MAY_OWNER_OVERRIDE
))
1821 err
= permission(inode
, MAY_EXEC
, NULL
);
1823 return err
? nfserrno(err
) : 0;
1827 nfsd_racache_shutdown(void)
1831 dprintk("nfsd: freeing readahead buffers.\n");
1833 raparm_cache
= raparml
= NULL
;
1836 * Initialize readahead param cache
1839 nfsd_racache_init(int cache_size
)
1845 raparml
= kmalloc(sizeof(struct raparms
) * cache_size
, GFP_KERNEL
);
1847 if (raparml
!= NULL
) {
1848 dprintk("nfsd: allocating %d readahead buffers.\n",
1850 memset(raparml
, 0, sizeof(struct raparms
) * cache_size
);
1851 for (i
= 0; i
< cache_size
- 1; i
++) {
1852 raparml
[i
].p_next
= raparml
+ i
+ 1;
1854 raparm_cache
= raparml
;
1857 "nfsd: Could not allocate memory read-ahead cache.\n");
1860 nfsdstats
.ra_size
= cache_size
;
1864 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
1866 nfsd_get_posix_acl(struct svc_fh
*fhp
, int type
)
1868 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
1872 struct posix_acl
*acl
;
1874 if (!IS_POSIXACL(inode
))
1875 return ERR_PTR(-EOPNOTSUPP
);
1878 case ACL_TYPE_ACCESS
:
1879 name
= POSIX_ACL_XATTR_ACCESS
;
1881 case ACL_TYPE_DEFAULT
:
1882 name
= POSIX_ACL_XATTR_DEFAULT
;
1885 return ERR_PTR(-EOPNOTSUPP
);
1888 size
= nfsd_getxattr(fhp
->fh_dentry
, name
, &value
);
1890 return ERR_PTR(size
);
1892 acl
= posix_acl_from_xattr(value
, size
);
1898 nfsd_set_posix_acl(struct svc_fh
*fhp
, int type
, struct posix_acl
*acl
)
1900 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
1906 if (!IS_POSIXACL(inode
) || !inode
->i_op
||
1907 !inode
->i_op
->setxattr
|| !inode
->i_op
->removexattr
)
1910 case ACL_TYPE_ACCESS
:
1911 name
= POSIX_ACL_XATTR_ACCESS
;
1913 case ACL_TYPE_DEFAULT
:
1914 name
= POSIX_ACL_XATTR_DEFAULT
;
1920 if (acl
&& acl
->a_count
) {
1921 size
= posix_acl_xattr_size(acl
->a_count
);
1922 value
= kmalloc(size
, GFP_KERNEL
);
1925 error
= posix_acl_to_xattr(acl
, value
, size
);
1933 error
= vfs_setxattr(fhp
->fh_dentry
, name
, value
, size
, 0);
1935 if (!S_ISDIR(inode
->i_mode
) && type
== ACL_TYPE_DEFAULT
)
1938 error
= vfs_removexattr(fhp
->fh_dentry
, name
);
1939 if (error
== -ENODATA
)
1948 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */