1 #define MSNFS /* HACK HACK */
5 * File operations used by nfsd. Some of these have been ripped from
6 * other parts of the kernel because they weren't exported, others
7 * are partial duplicates with added or changed functionality.
9 * Note that several functions dget() the dentry upon which they want
10 * to act, most notably those that create directory entries. Response
11 * dentry's are dput()'d if necessary in the release callback.
12 * So if you notice code paths that apparently fail to dput() the
13 * dentry, don't worry--they have been taken care of.
15 * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de>
16 * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp>
19 #include <linux/string.h>
20 #include <linux/time.h>
21 #include <linux/errno.h>
23 #include <linux/file.h>
24 #include <linux/mount.h>
25 #include <linux/major.h>
26 #include <linux/ext2_fs.h>
27 #include <linux/proc_fs.h>
28 #include <linux/stat.h>
29 #include <linux/fcntl.h>
30 #include <linux/net.h>
31 #include <linux/unistd.h>
32 #include <linux/slab.h>
33 #include <linux/pagemap.h>
35 #include <linux/module.h>
36 #include <linux/namei.h>
37 #include <linux/vfs.h>
38 #include <linux/delay.h>
39 #include <linux/sunrpc/svc.h>
40 #include <linux/nfsd/nfsd.h>
42 #include <linux/nfs3.h>
43 #include <linux/nfsd/xdr3.h>
44 #endif /* CONFIG_NFSD_V3 */
45 #include <linux/nfsd/nfsfh.h>
46 #include <linux/quotaops.h>
47 #include <linux/fsnotify.h>
48 #include <linux/posix_acl.h>
49 #include <linux/posix_acl_xattr.h>
50 #include <linux/xattr.h>
52 #include <linux/nfs4.h>
53 #include <linux/nfs4_acl.h>
54 #include <linux/nfsd_idmap.h>
55 #include <linux/security.h>
56 #endif /* CONFIG_NFSD_V4 */
57 #include <linux/jhash.h>
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
;
85 unsigned int p_hindex
;
88 struct raparm_hbucket
{
89 struct raparms
*pb_head
;
91 } ____cacheline_aligned_in_smp
;
93 static struct raparms
* raparml
;
94 #define RAPARM_HASH_BITS 4
95 #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS)
96 #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1)
97 static struct raparm_hbucket raparm_hash
[RAPARM_HASH_SIZE
];
100 * Called from nfsd_lookup and encode_dirent. Check if we have crossed
102 * Returns -EAGAIN leaving *dpp and *expp unchanged,
103 * or nfs_ok having possibly changed *dpp and *expp
106 nfsd_cross_mnt(struct svc_rqst
*rqstp
, struct dentry
**dpp
,
107 struct svc_export
**expp
)
109 struct svc_export
*exp
= *expp
, *exp2
= NULL
;
110 struct dentry
*dentry
= *dpp
;
111 struct vfsmount
*mnt
= mntget(exp
->ex_mnt
);
112 struct dentry
*mounts
= dget(dentry
);
115 while (follow_down(&mnt
,&mounts
)&&d_mountpoint(mounts
));
117 exp2
= exp_get_by_name(exp
->ex_client
, mnt
, mounts
, &rqstp
->rq_chandle
);
124 if (exp2
&& ((exp
->ex_flags
& NFSEXP_CROSSMOUNT
) || EX_NOHIDE(exp2
))) {
125 /* successfully crossed mount point */
131 if (exp2
) exp_put(exp2
);
140 * Look up one component of a pathname.
141 * N.B. After this call _both_ fhp and resfh need an fh_put
143 * If the lookup would cross a mountpoint, and the mounted filesystem
144 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
145 * accepted as it stands and the mounted directory is
146 * returned. Otherwise the covered directory is returned.
147 * NOTE: this mountpoint crossing is not supported properly by all
148 * clients and is explicitly disallowed for NFSv3
149 * NeilBrown <neilb@cse.unsw.edu.au>
152 nfsd_lookup(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, const char *name
,
153 int len
, struct svc_fh
*resfh
)
155 struct svc_export
*exp
;
156 struct dentry
*dparent
;
157 struct dentry
*dentry
;
161 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp
), len
,name
);
163 /* Obtain dentry and export. */
164 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_EXEC
);
168 dparent
= fhp
->fh_dentry
;
169 exp
= fhp
->fh_export
;
174 /* Lookup the name, but don't follow links */
175 if (isdotent(name
, len
)) {
177 dentry
= dget(dparent
);
178 else if (dparent
!= exp
->ex_dentry
) {
179 dentry
= dget_parent(dparent
);
180 } else if (!EX_NOHIDE(exp
))
181 dentry
= dget(dparent
); /* .. == . just like at / */
183 /* checking mountpoint crossing is very different when stepping up */
184 struct svc_export
*exp2
= NULL
;
186 struct vfsmount
*mnt
= mntget(exp
->ex_mnt
);
187 dentry
= dget(dparent
);
188 while(dentry
== mnt
->mnt_root
&& follow_up(&mnt
, &dentry
))
190 dp
= dget_parent(dentry
);
194 exp2
= exp_parent(exp
->ex_client
, mnt
, dentry
,
197 host_err
= PTR_ERR(exp2
);
204 dentry
= dget(dparent
);
213 dentry
= lookup_one_len(name
, dparent
, len
);
214 host_err
= PTR_ERR(dentry
);
218 * check if we have crossed a mount point ...
220 if (d_mountpoint(dentry
)) {
221 if ((host_err
= nfsd_cross_mnt(rqstp
, &dentry
, &exp
))) {
228 * Note: we compose the file handle now, but as the
229 * dentry may be negative, it may need to be updated.
231 err
= fh_compose(resfh
, exp
, dentry
, fhp
);
232 if (!err
&& !dentry
->d_inode
)
240 err
= nfserrno(host_err
);
245 * Set various file attributes.
246 * N.B. After this call fhp needs an fh_put
249 nfsd_setattr(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct iattr
*iap
,
250 int check_guard
, time_t guardtime
)
252 struct dentry
*dentry
;
254 int accmode
= MAY_SATTR
;
261 if (iap
->ia_valid
& (ATTR_ATIME
| ATTR_MTIME
| ATTR_SIZE
))
262 accmode
|= MAY_WRITE
|MAY_OWNER_OVERRIDE
;
263 if (iap
->ia_valid
& ATTR_SIZE
)
267 err
= fh_verify(rqstp
, fhp
, ftype
, accmode
);
271 dentry
= fhp
->fh_dentry
;
272 inode
= dentry
->d_inode
;
274 /* Ignore any mode updates on symlinks */
275 if (S_ISLNK(inode
->i_mode
))
276 iap
->ia_valid
&= ~ATTR_MODE
;
281 /* NFSv2 does not differentiate between "set-[ac]time-to-now"
282 * which only requires access, and "set-[ac]time-to-X" which
283 * requires ownership.
284 * So if it looks like it might be "set both to the same time which
285 * is close to now", and if inode_change_ok fails, then we
286 * convert to "set to now" instead of "set to explicit time"
288 * We only call inode_change_ok as the last test as technically
289 * it is not an interface that we should be using. It is only
290 * valid if the filesystem does not define it's own i_op->setattr.
292 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
293 #define MAX_TOUCH_TIME_ERROR (30*60)
294 if ((iap
->ia_valid
& BOTH_TIME_SET
) == BOTH_TIME_SET
295 && iap
->ia_mtime
.tv_sec
== iap
->ia_atime
.tv_sec
297 /* Looks probable. Now just make sure time is in the right ballpark.
298 * Solaris, at least, doesn't seem to care what the time request is.
299 * We require it be within 30 minutes of now.
301 time_t delta
= iap
->ia_atime
.tv_sec
- get_seconds();
302 if (delta
<0) delta
= -delta
;
303 if (delta
< MAX_TOUCH_TIME_ERROR
&&
304 inode_change_ok(inode
, iap
) != 0) {
305 /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
306 * this will cause notify_change to set these times to "now"
308 iap
->ia_valid
&= ~BOTH_TIME_SET
;
312 /* The size case is special. It changes the file as well as the attributes. */
313 if (iap
->ia_valid
& ATTR_SIZE
) {
314 if (iap
->ia_size
< inode
->i_size
) {
315 err
= nfsd_permission(fhp
->fh_export
, dentry
, MAY_TRUNC
|MAY_OWNER_OVERRIDE
);
321 * If we are changing the size of the file, then
322 * we need to break all leases.
324 host_err
= break_lease(inode
, FMODE_WRITE
| O_NONBLOCK
);
325 if (host_err
== -EWOULDBLOCK
)
326 host_err
= -ETIMEDOUT
;
327 if (host_err
) /* ENOMEM or EWOULDBLOCK */
330 host_err
= get_write_access(inode
);
335 host_err
= locks_verify_truncate(inode
, NULL
, iap
->ia_size
);
337 put_write_access(inode
);
343 imode
= inode
->i_mode
;
344 if (iap
->ia_valid
& ATTR_MODE
) {
345 iap
->ia_mode
&= S_IALLUGO
;
346 imode
= iap
->ia_mode
|= (imode
& ~S_IALLUGO
);
349 /* Revoke setuid/setgid bit on chown/chgrp */
350 if ((iap
->ia_valid
& ATTR_UID
) && iap
->ia_uid
!= inode
->i_uid
)
351 iap
->ia_valid
|= ATTR_KILL_SUID
;
352 if ((iap
->ia_valid
& ATTR_GID
) && iap
->ia_gid
!= inode
->i_gid
)
353 iap
->ia_valid
|= ATTR_KILL_SGID
;
355 /* Change the attributes. */
357 iap
->ia_valid
|= ATTR_CTIME
;
359 err
= nfserr_notsync
;
360 if (!check_guard
|| guardtime
== inode
->i_ctime
.tv_sec
) {
362 host_err
= notify_change(dentry
, iap
);
363 err
= nfserrno(host_err
);
367 put_write_access(inode
);
369 if (EX_ISSYNC(fhp
->fh_export
))
370 write_inode_now(inode
, 1);
375 err
= nfserrno(host_err
);
379 #if defined(CONFIG_NFSD_V2_ACL) || \
380 defined(CONFIG_NFSD_V3_ACL) || \
381 defined(CONFIG_NFSD_V4)
382 static ssize_t
nfsd_getxattr(struct dentry
*dentry
, char *key
, void **buf
)
386 buflen
= vfs_getxattr(dentry
, key
, NULL
, 0);
390 *buf
= kmalloc(buflen
, GFP_KERNEL
);
394 return vfs_getxattr(dentry
, key
, *buf
, buflen
);
398 #if defined(CONFIG_NFSD_V4)
400 set_nfsv4_acl_one(struct dentry
*dentry
, struct posix_acl
*pacl
, char *key
)
407 buflen
= posix_acl_xattr_size(pacl
->a_count
);
408 buf
= kmalloc(buflen
, GFP_KERNEL
);
413 len
= posix_acl_to_xattr(pacl
, buf
, buflen
);
419 error
= vfs_setxattr(dentry
, key
, buf
, len
, 0);
426 nfsd4_set_nfs4_acl(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
427 struct nfs4_acl
*acl
)
431 struct dentry
*dentry
;
433 struct posix_acl
*pacl
= NULL
, *dpacl
= NULL
;
434 unsigned int flags
= 0;
437 error
= fh_verify(rqstp
, fhp
, 0 /* S_IFREG */, MAY_SATTR
);
441 dentry
= fhp
->fh_dentry
;
442 inode
= dentry
->d_inode
;
443 if (S_ISDIR(inode
->i_mode
))
444 flags
= NFS4_ACL_DIR
;
446 host_error
= nfs4_acl_nfsv4_to_posix(acl
, &pacl
, &dpacl
, flags
);
447 if (host_error
== -EINVAL
) {
448 error
= nfserr_attrnotsupp
;
450 } else if (host_error
< 0)
453 host_error
= set_nfsv4_acl_one(dentry
, pacl
, POSIX_ACL_XATTR_ACCESS
);
457 if (S_ISDIR(inode
->i_mode
)) {
458 host_error
= set_nfsv4_acl_one(dentry
, dpacl
, POSIX_ACL_XATTR_DEFAULT
);
466 posix_acl_release(pacl
);
467 posix_acl_release(dpacl
);
470 error
= nfserrno(host_error
);
474 static struct posix_acl
*
475 _get_posix_acl(struct dentry
*dentry
, char *key
)
478 struct posix_acl
*pacl
= NULL
;
481 buflen
= nfsd_getxattr(dentry
, key
, &buf
);
485 return ERR_PTR(buflen
);
487 pacl
= posix_acl_from_xattr(buf
, buflen
);
493 nfsd4_get_nfs4_acl(struct svc_rqst
*rqstp
, struct dentry
*dentry
, struct nfs4_acl
**acl
)
495 struct inode
*inode
= dentry
->d_inode
;
497 struct posix_acl
*pacl
= NULL
, *dpacl
= NULL
;
498 unsigned int flags
= 0;
500 pacl
= _get_posix_acl(dentry
, POSIX_ACL_XATTR_ACCESS
);
501 if (IS_ERR(pacl
) && PTR_ERR(pacl
) == -ENODATA
)
502 pacl
= posix_acl_from_mode(inode
->i_mode
, GFP_KERNEL
);
504 error
= PTR_ERR(pacl
);
509 if (S_ISDIR(inode
->i_mode
)) {
510 dpacl
= _get_posix_acl(dentry
, POSIX_ACL_XATTR_DEFAULT
);
511 if (IS_ERR(dpacl
) && PTR_ERR(dpacl
) == -ENODATA
)
513 else if (IS_ERR(dpacl
)) {
514 error
= PTR_ERR(dpacl
);
518 flags
= NFS4_ACL_DIR
;
521 *acl
= nfs4_acl_posix_to_nfsv4(pacl
, dpacl
, flags
);
523 error
= PTR_ERR(*acl
);
527 posix_acl_release(pacl
);
528 posix_acl_release(dpacl
);
532 #endif /* defined(CONFIG_NFS_V4) */
534 #ifdef CONFIG_NFSD_V3
536 * Check server access rights to a file system object
542 static struct accessmap nfs3_regaccess
[] = {
543 { NFS3_ACCESS_READ
, MAY_READ
},
544 { NFS3_ACCESS_EXECUTE
, MAY_EXEC
},
545 { NFS3_ACCESS_MODIFY
, MAY_WRITE
|MAY_TRUNC
},
546 { NFS3_ACCESS_EXTEND
, MAY_WRITE
},
551 static struct accessmap nfs3_diraccess
[] = {
552 { NFS3_ACCESS_READ
, MAY_READ
},
553 { NFS3_ACCESS_LOOKUP
, MAY_EXEC
},
554 { NFS3_ACCESS_MODIFY
, MAY_EXEC
|MAY_WRITE
|MAY_TRUNC
},
555 { NFS3_ACCESS_EXTEND
, MAY_EXEC
|MAY_WRITE
},
556 { NFS3_ACCESS_DELETE
, MAY_REMOVE
},
561 static struct accessmap nfs3_anyaccess
[] = {
562 /* Some clients - Solaris 2.6 at least, make an access call
563 * to the server to check for access for things like /dev/null
564 * (which really, the server doesn't care about). So
565 * We provide simple access checking for them, looking
566 * mainly at mode bits, and we make sure to ignore read-only
569 { NFS3_ACCESS_READ
, MAY_READ
},
570 { NFS3_ACCESS_EXECUTE
, MAY_EXEC
},
571 { NFS3_ACCESS_MODIFY
, MAY_WRITE
|MAY_LOCAL_ACCESS
},
572 { NFS3_ACCESS_EXTEND
, MAY_WRITE
|MAY_LOCAL_ACCESS
},
578 nfsd_access(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, u32
*access
, u32
*supported
)
580 struct accessmap
*map
;
581 struct svc_export
*export
;
582 struct dentry
*dentry
;
583 u32 query
, result
= 0, sresult
= 0;
586 error
= fh_verify(rqstp
, fhp
, 0, MAY_NOP
);
590 export
= fhp
->fh_export
;
591 dentry
= fhp
->fh_dentry
;
593 if (S_ISREG(dentry
->d_inode
->i_mode
))
594 map
= nfs3_regaccess
;
595 else if (S_ISDIR(dentry
->d_inode
->i_mode
))
596 map
= nfs3_diraccess
;
598 map
= nfs3_anyaccess
;
602 for (; map
->access
; map
++) {
603 if (map
->access
& query
) {
606 sresult
|= map
->access
;
608 err2
= nfsd_permission(export
, dentry
, map
->how
);
611 result
|= map
->access
;
614 /* the following error codes just mean the access was not allowed,
615 * rather than an error occurred */
619 /* simply don't "or" in the access bit. */
629 *supported
= sresult
;
634 #endif /* CONFIG_NFSD_V3 */
639 * Open an existing file or directory.
640 * The access argument indicates the type of open (read/write/lock)
641 * N.B. After this call fhp needs an fh_put
644 nfsd_open(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, int type
,
645 int access
, struct file
**filp
)
647 struct dentry
*dentry
;
649 int flags
= O_RDONLY
|O_LARGEFILE
;
654 * If we get here, then the client has already done an "open",
655 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
656 * in case a chmod has now revoked permission.
658 err
= fh_verify(rqstp
, fhp
, type
, access
| MAY_OWNER_OVERRIDE
);
662 dentry
= fhp
->fh_dentry
;
663 inode
= dentry
->d_inode
;
665 /* Disallow write access to files with the append-only bit set
666 * or any access when mandatory locking enabled
669 if (IS_APPEND(inode
) && (access
& MAY_WRITE
))
671 if (IS_ISMNDLK(inode
))
678 * Check to see if there are any leases on this file.
679 * This may block while leases are broken.
681 host_err
= break_lease(inode
, O_NONBLOCK
| ((access
& MAY_WRITE
) ? FMODE_WRITE
: 0));
682 if (host_err
== -EWOULDBLOCK
)
683 host_err
= -ETIMEDOUT
;
684 if (host_err
) /* NOMEM or WOULDBLOCK */
687 if (access
& MAY_WRITE
) {
688 if (access
& MAY_READ
)
689 flags
= O_RDWR
|O_LARGEFILE
;
691 flags
= O_WRONLY
|O_LARGEFILE
;
695 *filp
= dentry_open(dget(dentry
), mntget(fhp
->fh_export
->ex_mnt
), flags
);
697 host_err
= PTR_ERR(*filp
);
699 err
= nfserrno(host_err
);
708 nfsd_close(struct file
*filp
)
715 * As this calls fsync (not fdatasync) there is no need for a write_inode
718 static inline int nfsd_dosync(struct file
*filp
, struct dentry
*dp
,
719 const struct file_operations
*fop
)
721 struct inode
*inode
= dp
->d_inode
;
722 int (*fsync
) (struct file
*, struct dentry
*, int);
725 err
= filemap_fdatawrite(inode
->i_mapping
);
726 if (err
== 0 && fop
&& (fsync
= fop
->fsync
))
727 err
= fsync(filp
, dp
, 0);
729 err
= filemap_fdatawait(inode
->i_mapping
);
736 nfsd_sync(struct file
*filp
)
739 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
740 dprintk("nfsd: sync file %s\n", filp
->f_path
.dentry
->d_name
.name
);
741 mutex_lock(&inode
->i_mutex
);
742 err
=nfsd_dosync(filp
, filp
->f_path
.dentry
, filp
->f_op
);
743 mutex_unlock(&inode
->i_mutex
);
749 nfsd_sync_dir(struct dentry
*dp
)
751 return nfsd_dosync(NULL
, dp
, dp
->d_inode
->i_fop
);
755 * Obtain the readahead parameters for the file
756 * specified by (dev, ino).
759 static inline struct raparms
*
760 nfsd_get_raparms(dev_t dev
, ino_t ino
)
762 struct raparms
*ra
, **rap
, **frap
= NULL
;
765 struct raparm_hbucket
*rab
;
767 hash
= jhash_2words(dev
, ino
, 0xfeedbeef) & RAPARM_HASH_MASK
;
768 rab
= &raparm_hash
[hash
];
770 spin_lock(&rab
->pb_lock
);
771 for (rap
= &rab
->pb_head
; (ra
= *rap
); rap
= &ra
->p_next
) {
772 if (ra
->p_ino
== ino
&& ra
->p_dev
== dev
)
775 if (ra
->p_count
== 0)
778 depth
= nfsdstats
.ra_size
*11/10;
780 spin_unlock(&rab
->pb_lock
);
790 if (rap
!= &rab
->pb_head
) {
792 ra
->p_next
= rab
->pb_head
;
796 nfsdstats
.ra_depth
[depth
*10/nfsdstats
.ra_size
]++;
797 spin_unlock(&rab
->pb_lock
);
802 * Grab and keep cached pages assosiated with a file in the svc_rqst
803 * so that they can be passed to the netowork sendmsg/sendpage routines
804 * directrly. They will be released after the sending has completed.
807 nfsd_read_actor(read_descriptor_t
*desc
, struct page
*page
, unsigned long offset
, unsigned long size
)
809 unsigned long count
= desc
->count
;
810 struct svc_rqst
*rqstp
= desc
->arg
.data
;
811 struct page
**pp
= rqstp
->rq_respages
+ rqstp
->rq_resused
;
816 if (rqstp
->rq_res
.page_len
== 0) {
821 rqstp
->rq_res
.page_base
= offset
;
822 rqstp
->rq_res
.page_len
= size
;
823 } else if (page
!= pp
[-1]) {
828 rqstp
->rq_res
.page_len
+= size
;
830 rqstp
->rq_res
.page_len
+= size
;
832 desc
->count
= count
- size
;
833 desc
->written
+= size
;
838 nfsd_vfs_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
839 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long *count
)
848 inode
= file
->f_path
.dentry
->d_inode
;
850 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
851 (!lock_may_read(inode
, offset
, *count
)))
855 /* Get readahead parameters */
856 ra
= nfsd_get_raparms(inode
->i_sb
->s_dev
, inode
->i_ino
);
859 file
->f_ra
= ra
->p_ra
;
861 if (file
->f_op
->sendfile
&& rqstp
->rq_sendfile_ok
) {
862 rqstp
->rq_resused
= 1;
863 host_err
= file
->f_op
->sendfile(file
, &offset
, *count
,
864 nfsd_read_actor
, rqstp
);
868 host_err
= vfs_readv(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
872 /* Write back readahead params */
874 struct raparm_hbucket
*rab
= &raparm_hash
[ra
->p_hindex
];
875 spin_lock(&rab
->pb_lock
);
876 ra
->p_ra
= file
->f_ra
;
879 spin_unlock(&rab
->pb_lock
);
883 nfsdstats
.io_read
+= host_err
;
886 fsnotify_access(file
->f_path
.dentry
);
888 err
= nfserrno(host_err
);
893 static void kill_suid(struct dentry
*dentry
)
896 ia
.ia_valid
= ATTR_KILL_SUID
| ATTR_KILL_SGID
;
898 mutex_lock(&dentry
->d_inode
->i_mutex
);
899 notify_change(dentry
, &ia
);
900 mutex_unlock(&dentry
->d_inode
->i_mutex
);
904 nfsd_vfs_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
905 loff_t offset
, struct kvec
*vec
, int vlen
,
906 unsigned long cnt
, int *stablep
)
908 struct svc_export
*exp
;
909 struct dentry
*dentry
;
914 int stable
= *stablep
;
919 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
920 (!lock_may_write(file
->f_path
.dentry
->d_inode
, offset
, cnt
)))
924 dentry
= file
->f_path
.dentry
;
925 inode
= dentry
->d_inode
;
926 exp
= fhp
->fh_export
;
929 * Request sync writes if
930 * - the sync export option has been set, or
931 * - the client requested O_SYNC behavior (NFSv3 feature).
932 * - The file system doesn't support fsync().
933 * When gathered writes have been configured for this volume,
934 * flushing the data to disk is handled separately below.
937 if (file
->f_op
->fsync
== 0) {/* COMMIT3 cannot work */
939 *stablep
= 2; /* FILE_SYNC */
944 if (stable
&& !EX_WGATHER(exp
))
945 file
->f_flags
|= O_SYNC
;
947 /* Write the data. */
948 oldfs
= get_fs(); set_fs(KERNEL_DS
);
949 host_err
= vfs_writev(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
952 nfsdstats
.io_write
+= cnt
;
953 fsnotify_modify(file
->f_path
.dentry
);
956 /* clear setuid/setgid flag after write */
957 if (host_err
>= 0 && (inode
->i_mode
& (S_ISUID
| S_ISGID
)))
960 if (host_err
>= 0 && stable
) {
961 static ino_t last_ino
;
962 static dev_t last_dev
;
965 * Gathered writes: If another process is currently
966 * writing to the file, there's a high chance
967 * this is another nfsd (triggered by a bulk write
968 * from a client's biod). Rather than syncing the
969 * file with each write request, we sleep for 10 msec.
971 * I don't know if this roughly approximates
972 * C. Juszak's idea of gathered writes, but it's a
973 * nice and simple solution (IMHO), and it seems to
976 if (EX_WGATHER(exp
)) {
977 if (atomic_read(&inode
->i_writecount
) > 1
978 || (last_ino
== inode
->i_ino
&& last_dev
== inode
->i_sb
->s_dev
)) {
979 dprintk("nfsd: write defer %d\n", current
->pid
);
981 dprintk("nfsd: write resume %d\n", current
->pid
);
984 if (inode
->i_state
& I_DIRTY
) {
985 dprintk("nfsd: write sync %d\n", current
->pid
);
986 host_err
=nfsd_sync(file
);
989 wake_up(&inode
->i_wait
);
992 last_ino
= inode
->i_ino
;
993 last_dev
= inode
->i_sb
->s_dev
;
996 dprintk("nfsd: write complete host_err=%d\n", host_err
);
1000 err
= nfserrno(host_err
);
1006 * Read data from a file. count must contain the requested read count
1007 * on entry. On return, *count contains the number of bytes actually read.
1008 * N.B. After this call fhp needs an fh_put
1011 nfsd_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1012 loff_t offset
, struct kvec
*vec
, int vlen
,
1013 unsigned long *count
)
1018 err
= nfsd_permission(fhp
->fh_export
, fhp
->fh_dentry
,
1019 MAY_READ
|MAY_OWNER_OVERRIDE
);
1022 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
1024 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_READ
, &file
);
1027 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
1035 * Write data to a file.
1036 * The stable flag requests synchronous writes.
1037 * N.B. After this call fhp needs an fh_put
1040 nfsd_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1041 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long cnt
,
1047 err
= nfsd_permission(fhp
->fh_export
, fhp
->fh_dentry
,
1048 MAY_WRITE
|MAY_OWNER_OVERRIDE
);
1051 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
, cnt
,
1054 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_WRITE
, &file
);
1059 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
,
1067 #ifdef CONFIG_NFSD_V3
1069 * Commit all pending writes to stable storage.
1070 * Strictly speaking, we could sync just the indicated file region here,
1071 * but there's currently no way we can ask the VFS to do so.
1073 * Unfortunately we cannot lock the file to make sure we return full WCC
1074 * data to the client, as locking happens lower down in the filesystem.
1077 nfsd_commit(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1078 loff_t offset
, unsigned long count
)
1083 if ((u64
)count
> ~(u64
)offset
)
1084 return nfserr_inval
;
1086 if ((err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_WRITE
, &file
)) != 0)
1088 if (EX_ISSYNC(fhp
->fh_export
)) {
1089 if (file
->f_op
&& file
->f_op
->fsync
) {
1090 err
= nfserrno(nfsd_sync(file
));
1092 err
= nfserr_notsupp
;
1099 #endif /* CONFIG_NFSD_V3 */
1102 * Create a file (regular, directory, device, fifo); UNIX sockets
1103 * not yet implemented.
1104 * If the response fh has been verified, the parent directory should
1105 * already be locked. Note that the parent directory is left locked.
1107 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1110 nfsd_create(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1111 char *fname
, int flen
, struct iattr
*iap
,
1112 int type
, dev_t rdev
, struct svc_fh
*resfhp
)
1114 struct dentry
*dentry
, *dchild
= NULL
;
1123 if (isdotent(fname
, flen
))
1126 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1130 dentry
= fhp
->fh_dentry
;
1131 dirp
= dentry
->d_inode
;
1133 err
= nfserr_notdir
;
1134 if(!dirp
->i_op
|| !dirp
->i_op
->lookup
)
1137 * Check whether the response file handle has been verified yet.
1138 * If it has, the parent directory should already be locked.
1140 if (!resfhp
->fh_dentry
) {
1141 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1142 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1143 dchild
= lookup_one_len(fname
, dentry
, flen
);
1144 host_err
= PTR_ERR(dchild
);
1147 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1151 /* called from nfsd_proc_create */
1152 dchild
= dget(resfhp
->fh_dentry
);
1153 if (!fhp
->fh_locked
) {
1154 /* not actually possible */
1156 "nfsd_create: parent %s/%s not locked!\n",
1157 dentry
->d_parent
->d_name
.name
,
1158 dentry
->d_name
.name
);
1164 * Make sure the child dentry is still negative ...
1167 if (dchild
->d_inode
) {
1168 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1169 dentry
->d_name
.name
, dchild
->d_name
.name
);
1173 if (!(iap
->ia_valid
& ATTR_MODE
))
1175 iap
->ia_mode
= (iap
->ia_mode
& S_IALLUGO
) | type
;
1178 * Get the dir op function pointer.
1183 host_err
= vfs_create(dirp
, dchild
, iap
->ia_mode
, NULL
);
1186 host_err
= vfs_mkdir(dirp
, dchild
, iap
->ia_mode
);
1192 host_err
= vfs_mknod(dirp
, dchild
, iap
->ia_mode
, rdev
);
1195 printk("nfsd: bad file type %o in nfsd_create\n", type
);
1201 if (EX_ISSYNC(fhp
->fh_export
)) {
1202 err
= nfserrno(nfsd_sync_dir(dentry
));
1203 write_inode_now(dchild
->d_inode
, 1);
1207 /* Set file attributes. Mode has already been set and
1208 * setting uid/gid works only for root. Irix appears to
1209 * send along the gid when it tries to implement setgid
1210 * directories via NFS.
1212 if ((iap
->ia_valid
&= ~(ATTR_UID
|ATTR_GID
|ATTR_MODE
)) != 0) {
1213 __be32 err2
= nfsd_setattr(rqstp
, resfhp
, iap
, 0, (time_t)0);
1218 * Update the file handle to get the new inode info.
1221 err
= fh_update(resfhp
);
1223 if (dchild
&& !IS_ERR(dchild
))
1228 err
= nfserrno(host_err
);
1232 #ifdef CONFIG_NFSD_V3
1234 * NFSv3 version of nfsd_create
1237 nfsd_create_v3(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1238 char *fname
, int flen
, struct iattr
*iap
,
1239 struct svc_fh
*resfhp
, int createmode
, u32
*verifier
,
1240 int *truncp
, int *created
)
1242 struct dentry
*dentry
, *dchild
= NULL
;
1246 __u32 v_mtime
=0, v_atime
=0;
1253 if (isdotent(fname
, flen
))
1255 if (!(iap
->ia_valid
& ATTR_MODE
))
1257 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1261 dentry
= fhp
->fh_dentry
;
1262 dirp
= dentry
->d_inode
;
1264 /* Get all the sanity checks out of the way before
1265 * we lock the parent. */
1266 err
= nfserr_notdir
;
1267 if(!dirp
->i_op
|| !dirp
->i_op
->lookup
)
1269 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1272 * Compose the response file handle.
1274 dchild
= lookup_one_len(fname
, dentry
, flen
);
1275 host_err
= PTR_ERR(dchild
);
1279 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1283 if (createmode
== NFS3_CREATE_EXCLUSIVE
) {
1284 /* while the verifier would fit in mtime+atime,
1285 * solaris7 gets confused (bugid 4218508) if these have
1286 * the high bit set, so we use the mode as well
1288 v_mtime
= verifier
[0]&0x7fffffff;
1289 v_atime
= verifier
[1]&0x7fffffff;
1291 | ((verifier
[0]&0x80000000) >> (32-7)) /* u+x */
1292 | ((verifier
[1]&0x80000000) >> (32-9)) /* u+r */
1296 if (dchild
->d_inode
) {
1299 switch (createmode
) {
1300 case NFS3_CREATE_UNCHECKED
:
1301 if (! S_ISREG(dchild
->d_inode
->i_mode
))
1304 /* in nfsv4, we need to treat this case a little
1305 * differently. we don't want to truncate the
1306 * file now; this would be wrong if the OPEN
1307 * fails for some other reason. furthermore,
1308 * if the size is nonzero, we should ignore it
1309 * according to spec!
1311 *truncp
= (iap
->ia_valid
& ATTR_SIZE
) && !iap
->ia_size
;
1314 iap
->ia_valid
&= ATTR_SIZE
;
1318 case NFS3_CREATE_EXCLUSIVE
:
1319 if ( dchild
->d_inode
->i_mtime
.tv_sec
== v_mtime
1320 && dchild
->d_inode
->i_atime
.tv_sec
== v_atime
1321 && dchild
->d_inode
->i_mode
== v_mode
1322 && dchild
->d_inode
->i_size
== 0 )
1325 case NFS3_CREATE_GUARDED
:
1331 host_err
= vfs_create(dirp
, dchild
, iap
->ia_mode
, NULL
);
1337 if (EX_ISSYNC(fhp
->fh_export
)) {
1338 err
= nfserrno(nfsd_sync_dir(dentry
));
1339 /* setattr will sync the child (or not) */
1342 if (createmode
== NFS3_CREATE_EXCLUSIVE
) {
1343 /* Cram the verifier into atime/mtime/mode */
1344 iap
->ia_valid
= ATTR_MTIME
|ATTR_ATIME
1345 | ATTR_MTIME_SET
|ATTR_ATIME_SET
1347 /* XXX someone who knows this better please fix it for nsec */
1348 iap
->ia_mtime
.tv_sec
= v_mtime
;
1349 iap
->ia_atime
.tv_sec
= v_atime
;
1350 iap
->ia_mtime
.tv_nsec
= 0;
1351 iap
->ia_atime
.tv_nsec
= 0;
1352 iap
->ia_mode
= v_mode
;
1355 /* Set file attributes.
1356 * Mode has already been set but we might need to reset it
1357 * for CREATE_EXCLUSIVE
1358 * Irix appears to send along the gid when it tries to
1359 * implement setgid directories via NFS. Clear out all that cruft.
1362 if ((iap
->ia_valid
&= ~(ATTR_UID
|ATTR_GID
)) != 0) {
1363 __be32 err2
= nfsd_setattr(rqstp
, resfhp
, iap
, 0, (time_t)0);
1369 * Update the filehandle to get the new inode info.
1372 err
= fh_update(resfhp
);
1376 if (dchild
&& !IS_ERR(dchild
))
1381 err
= nfserrno(host_err
);
1384 #endif /* CONFIG_NFSD_V3 */
1387 * Read a symlink. On entry, *lenp must contain the maximum path length that
1388 * fits into the buffer. On return, it contains the true length.
1389 * N.B. After this call fhp needs an fh_put
1392 nfsd_readlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, char *buf
, int *lenp
)
1394 struct dentry
*dentry
;
1395 struct inode
*inode
;
1400 err
= fh_verify(rqstp
, fhp
, S_IFLNK
, MAY_NOP
);
1404 dentry
= fhp
->fh_dentry
;
1405 inode
= dentry
->d_inode
;
1408 if (!inode
->i_op
|| !inode
->i_op
->readlink
)
1411 touch_atime(fhp
->fh_export
->ex_mnt
, dentry
);
1412 /* N.B. Why does this call need a get_fs()??
1413 * Remove the set_fs and watch the fireworks:-) --okir
1416 oldfs
= get_fs(); set_fs(KERNEL_DS
);
1417 host_err
= inode
->i_op
->readlink(dentry
, buf
, *lenp
);
1428 err
= nfserrno(host_err
);
1433 * Create a symlink and look up its inode
1434 * N.B. After this call _both_ fhp and resfhp need an fh_put
1437 nfsd_symlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1438 char *fname
, int flen
,
1439 char *path
, int plen
,
1440 struct svc_fh
*resfhp
,
1443 struct dentry
*dentry
, *dnew
;
1452 if (isdotent(fname
, flen
))
1455 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1459 dentry
= fhp
->fh_dentry
;
1460 dnew
= lookup_one_len(fname
, dentry
, flen
);
1461 host_err
= PTR_ERR(dnew
);
1466 /* Only the MODE ATTRibute is even vaguely meaningful */
1467 if (iap
&& (iap
->ia_valid
& ATTR_MODE
))
1468 mode
= iap
->ia_mode
& S_IALLUGO
;
1470 if (unlikely(path
[plen
] != 0)) {
1471 char *path_alloced
= kmalloc(plen
+1, GFP_KERNEL
);
1472 if (path_alloced
== NULL
)
1475 strncpy(path_alloced
, path
, plen
);
1476 path_alloced
[plen
] = 0;
1477 host_err
= vfs_symlink(dentry
->d_inode
, dnew
, path_alloced
, mode
);
1478 kfree(path_alloced
);
1481 host_err
= vfs_symlink(dentry
->d_inode
, dnew
, path
, mode
);
1484 if (EX_ISSYNC(fhp
->fh_export
))
1485 host_err
= nfsd_sync_dir(dentry
);
1487 err
= nfserrno(host_err
);
1490 cerr
= fh_compose(resfhp
, fhp
->fh_export
, dnew
, fhp
);
1492 if (err
==0) err
= cerr
;
1497 err
= nfserrno(host_err
);
1503 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1506 nfsd_link(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
,
1507 char *name
, int len
, struct svc_fh
*tfhp
)
1509 struct dentry
*ddir
, *dnew
, *dold
;
1510 struct inode
*dirp
, *dest
;
1514 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, MAY_CREATE
);
1517 err
= fh_verify(rqstp
, tfhp
, -S_IFDIR
, MAY_NOP
);
1525 if (isdotent(name
, len
))
1528 fh_lock_nested(ffhp
, I_MUTEX_PARENT
);
1529 ddir
= ffhp
->fh_dentry
;
1530 dirp
= ddir
->d_inode
;
1532 dnew
= lookup_one_len(name
, ddir
, len
);
1533 host_err
= PTR_ERR(dnew
);
1537 dold
= tfhp
->fh_dentry
;
1538 dest
= dold
->d_inode
;
1540 host_err
= vfs_link(dold
, dirp
, dnew
);
1542 if (EX_ISSYNC(ffhp
->fh_export
)) {
1543 err
= nfserrno(nfsd_sync_dir(ddir
));
1544 write_inode_now(dest
, 1);
1548 if (host_err
== -EXDEV
&& rqstp
->rq_vers
== 2)
1551 err
= nfserrno(host_err
);
1561 err
= nfserrno(host_err
);
1567 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1570 nfsd_rename(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
, char *fname
, int flen
,
1571 struct svc_fh
*tfhp
, char *tname
, int tlen
)
1573 struct dentry
*fdentry
, *tdentry
, *odentry
, *ndentry
, *trap
;
1574 struct inode
*fdir
, *tdir
;
1578 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, MAY_REMOVE
);
1581 err
= fh_verify(rqstp
, tfhp
, S_IFDIR
, MAY_CREATE
);
1585 fdentry
= ffhp
->fh_dentry
;
1586 fdir
= fdentry
->d_inode
;
1588 tdentry
= tfhp
->fh_dentry
;
1589 tdir
= tdentry
->d_inode
;
1591 err
= (rqstp
->rq_vers
== 2) ? nfserr_acces
: nfserr_xdev
;
1592 if (ffhp
->fh_export
!= tfhp
->fh_export
)
1596 if (!flen
|| isdotent(fname
, flen
) || !tlen
|| isdotent(tname
, tlen
))
1599 /* cannot use fh_lock as we need deadlock protective ordering
1600 * so do it by hand */
1601 trap
= lock_rename(tdentry
, fdentry
);
1602 ffhp
->fh_locked
= tfhp
->fh_locked
= 1;
1606 odentry
= lookup_one_len(fname
, fdentry
, flen
);
1607 host_err
= PTR_ERR(odentry
);
1608 if (IS_ERR(odentry
))
1612 if (!odentry
->d_inode
)
1615 if (odentry
== trap
)
1618 ndentry
= lookup_one_len(tname
, tdentry
, tlen
);
1619 host_err
= PTR_ERR(ndentry
);
1620 if (IS_ERR(ndentry
))
1622 host_err
= -ENOTEMPTY
;
1623 if (ndentry
== trap
)
1627 if ((ffhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
1628 ((atomic_read(&odentry
->d_count
) > 1)
1629 || (atomic_read(&ndentry
->d_count
) > 1))) {
1633 host_err
= vfs_rename(fdir
, odentry
, tdir
, ndentry
);
1634 if (!host_err
&& EX_ISSYNC(tfhp
->fh_export
)) {
1635 host_err
= nfsd_sync_dir(tdentry
);
1637 host_err
= nfsd_sync_dir(fdentry
);
1645 err
= nfserrno(host_err
);
1647 /* we cannot reply on fh_unlock on the two filehandles,
1648 * as that would do the wrong thing if the two directories
1649 * were the same, so again we do it by hand
1651 fill_post_wcc(ffhp
);
1652 fill_post_wcc(tfhp
);
1653 unlock_rename(tdentry
, fdentry
);
1654 ffhp
->fh_locked
= tfhp
->fh_locked
= 0;
1661 * Unlink a file or directory
1662 * N.B. After this call fhp needs an fh_put
1665 nfsd_unlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, int type
,
1666 char *fname
, int flen
)
1668 struct dentry
*dentry
, *rdentry
;
1674 if (!flen
|| isdotent(fname
, flen
))
1676 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_REMOVE
);
1680 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1681 dentry
= fhp
->fh_dentry
;
1682 dirp
= dentry
->d_inode
;
1684 rdentry
= lookup_one_len(fname
, dentry
, flen
);
1685 host_err
= PTR_ERR(rdentry
);
1686 if (IS_ERR(rdentry
))
1689 if (!rdentry
->d_inode
) {
1696 type
= rdentry
->d_inode
->i_mode
& S_IFMT
;
1698 if (type
!= S_IFDIR
) { /* It's UNLINK */
1700 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
1701 (atomic_read(&rdentry
->d_count
) > 1)) {
1705 host_err
= vfs_unlink(dirp
, rdentry
);
1706 } else { /* It's RMDIR */
1707 host_err
= vfs_rmdir(dirp
, rdentry
);
1714 if (EX_ISSYNC(fhp
->fh_export
))
1715 host_err
= nfsd_sync_dir(dentry
);
1718 err
= nfserrno(host_err
);
1724 * Read entries from a directory.
1725 * The NFSv3/4 verifier we ignore for now.
1728 nfsd_readdir(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, loff_t
*offsetp
,
1729 struct readdir_cd
*cdp
, encode_dent_fn func
)
1734 loff_t offset
= *offsetp
;
1736 err
= nfsd_open(rqstp
, fhp
, S_IFDIR
, MAY_READ
, &file
);
1740 offset
= vfs_llseek(file
, offset
, 0);
1742 err
= nfserrno((int)offset
);
1747 * Read the directory entries. This silly loop is necessary because
1748 * readdir() is not guaranteed to fill up the entire buffer, but
1749 * may choose to do less.
1753 cdp
->err
= nfserr_eof
; /* will be cleared on successful read */
1754 host_err
= vfs_readdir(file
, (filldir_t
) func
, cdp
);
1755 } while (host_err
>=0 && cdp
->err
== nfs_ok
);
1757 err
= nfserrno(host_err
);
1760 *offsetp
= vfs_llseek(file
, 0, 1);
1762 if (err
== nfserr_eof
|| err
== nfserr_toosmall
)
1763 err
= nfs_ok
; /* can still be found in ->err */
1771 * Get file system stats
1772 * N.B. After this call fhp needs an fh_put
1775 nfsd_statfs(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct kstatfs
*stat
)
1777 __be32 err
= fh_verify(rqstp
, fhp
, 0, MAY_NOP
);
1778 if (!err
&& vfs_statfs(fhp
->fh_dentry
,stat
))
1784 * Check for a user's access permissions to this inode.
1787 nfsd_permission(struct svc_export
*exp
, struct dentry
*dentry
, int acc
)
1789 struct inode
*inode
= dentry
->d_inode
;
1795 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
1797 (acc
& MAY_READ
)? " read" : "",
1798 (acc
& MAY_WRITE
)? " write" : "",
1799 (acc
& MAY_EXEC
)? " exec" : "",
1800 (acc
& MAY_SATTR
)? " sattr" : "",
1801 (acc
& MAY_TRUNC
)? " trunc" : "",
1802 (acc
& MAY_LOCK
)? " lock" : "",
1803 (acc
& MAY_OWNER_OVERRIDE
)? " owneroverride" : "",
1805 IS_IMMUTABLE(inode
)? " immut" : "",
1806 IS_APPEND(inode
)? " append" : "",
1807 IS_RDONLY(inode
)? " ro" : "");
1808 dprintk(" owner %d/%d user %d/%d\n",
1809 inode
->i_uid
, inode
->i_gid
, current
->fsuid
, current
->fsgid
);
1812 /* Normally we reject any write/sattr etc access on a read-only file
1813 * system. But if it is IRIX doing check on write-access for a
1814 * device special file, we ignore rofs.
1816 if (!(acc
& MAY_LOCAL_ACCESS
))
1817 if (acc
& (MAY_WRITE
| MAY_SATTR
| MAY_TRUNC
)) {
1818 if (EX_RDONLY(exp
) || IS_RDONLY(inode
))
1820 if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode
))
1823 if ((acc
& MAY_TRUNC
) && IS_APPEND(inode
))
1826 if (acc
& MAY_LOCK
) {
1827 /* If we cannot rely on authentication in NLM requests,
1828 * just allow locks, otherwise require read permission, or
1831 if (exp
->ex_flags
& NFSEXP_NOAUTHNLM
)
1834 acc
= MAY_READ
| MAY_OWNER_OVERRIDE
;
1837 * The file owner always gets access permission for accesses that
1838 * would normally be checked at open time. This is to make
1839 * file access work even when the client has done a fchmod(fd, 0).
1841 * However, `cp foo bar' should fail nevertheless when bar is
1842 * readonly. A sensible way to do this might be to reject all
1843 * attempts to truncate a read-only file, because a creat() call
1844 * always implies file truncation.
1845 * ... but this isn't really fair. A process may reasonably call
1846 * ftruncate on an open file descriptor on a file with perm 000.
1847 * We must trust the client to do permission checking - using "ACCESS"
1850 if ((acc
& MAY_OWNER_OVERRIDE
) &&
1851 inode
->i_uid
== current
->fsuid
)
1854 err
= permission(inode
, acc
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
), NULL
);
1856 /* Allow read access to binaries even when mode 111 */
1857 if (err
== -EACCES
&& S_ISREG(inode
->i_mode
) &&
1858 acc
== (MAY_READ
| MAY_OWNER_OVERRIDE
))
1859 err
= permission(inode
, MAY_EXEC
, NULL
);
1861 return err
? nfserrno(err
) : 0;
1865 nfsd_racache_shutdown(void)
1869 dprintk("nfsd: freeing readahead buffers.\n");
1874 * Initialize readahead param cache
1877 nfsd_racache_init(int cache_size
)
1886 if (cache_size
< 2*RAPARM_HASH_SIZE
)
1887 cache_size
= 2*RAPARM_HASH_SIZE
;
1888 raparml
= kcalloc(cache_size
, sizeof(struct raparms
), GFP_KERNEL
);
1892 "nfsd: Could not allocate memory read-ahead cache.\n");
1896 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size
);
1897 for (i
= 0 ; i
< RAPARM_HASH_SIZE
; i
++) {
1898 raparm_hash
[i
].pb_head
= NULL
;
1899 spin_lock_init(&raparm_hash
[i
].pb_lock
);
1901 nperbucket
= cache_size
>> RAPARM_HASH_BITS
;
1902 for (i
= 0; i
< cache_size
- 1; i
++) {
1903 if (i
% nperbucket
== 0)
1904 raparm_hash
[j
++].pb_head
= raparml
+ i
;
1905 if (i
% nperbucket
< nperbucket
-1)
1906 raparml
[i
].p_next
= raparml
+ i
+ 1;
1909 nfsdstats
.ra_size
= cache_size
;
1913 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
1915 nfsd_get_posix_acl(struct svc_fh
*fhp
, int type
)
1917 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
1921 struct posix_acl
*acl
;
1923 if (!IS_POSIXACL(inode
))
1924 return ERR_PTR(-EOPNOTSUPP
);
1927 case ACL_TYPE_ACCESS
:
1928 name
= POSIX_ACL_XATTR_ACCESS
;
1930 case ACL_TYPE_DEFAULT
:
1931 name
= POSIX_ACL_XATTR_DEFAULT
;
1934 return ERR_PTR(-EOPNOTSUPP
);
1937 size
= nfsd_getxattr(fhp
->fh_dentry
, name
, &value
);
1939 return ERR_PTR(size
);
1941 acl
= posix_acl_from_xattr(value
, size
);
1947 nfsd_set_posix_acl(struct svc_fh
*fhp
, int type
, struct posix_acl
*acl
)
1949 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
1955 if (!IS_POSIXACL(inode
) || !inode
->i_op
||
1956 !inode
->i_op
->setxattr
|| !inode
->i_op
->removexattr
)
1959 case ACL_TYPE_ACCESS
:
1960 name
= POSIX_ACL_XATTR_ACCESS
;
1962 case ACL_TYPE_DEFAULT
:
1963 name
= POSIX_ACL_XATTR_DEFAULT
;
1969 if (acl
&& acl
->a_count
) {
1970 size
= posix_acl_xattr_size(acl
->a_count
);
1971 value
= kmalloc(size
, GFP_KERNEL
);
1974 error
= posix_acl_to_xattr(acl
, value
, size
);
1982 error
= vfs_setxattr(fhp
->fh_dentry
, name
, value
, size
, 0);
1984 if (!S_ISDIR(inode
->i_mode
) && type
== ACL_TYPE_DEFAULT
)
1987 error
= vfs_removexattr(fhp
->fh_dentry
, name
);
1988 if (error
== -ENODATA
)
1997 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */