1 #define MSNFS /* HACK HACK */
3 * File operations used by nfsd. Some of these have been ripped from
4 * other parts of the kernel because they weren't exported, others
5 * are partial duplicates with added or changed functionality.
7 * Note that several functions dget() the dentry upon which they want
8 * to act, most notably those that create directory entries. Response
9 * dentry's are dput()'d if necessary in the release callback.
10 * So if you notice code paths that apparently fail to dput() the
11 * dentry, don't worry--they have been taken care of.
13 * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de>
14 * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp>
18 #include <linux/file.h>
19 #include <linux/splice.h>
20 #include <linux/fcntl.h>
21 #include <linux/namei.h>
22 #include <linux/delay.h>
23 #include <linux/quotaops.h>
24 #include <linux/fsnotify.h>
25 #include <linux/posix_acl_xattr.h>
26 #include <linux/xattr.h>
27 #include <linux/jhash.h>
28 #include <linux/ima.h>
29 #include <asm/uaccess.h>
33 #endif /* CONFIG_NFSD_V3 */
36 #include <linux/nfs4_acl.h>
37 #include <linux/nfsd_idmap.h>
38 #endif /* CONFIG_NFSD_V4 */
43 #define NFSDDBG_FACILITY NFSDDBG_FILEOP
47 * This is a cache of readahead params that help us choose the proper
48 * readahead strategy. Initially, we set all readahead parameters to 0
49 * and let the VFS handle things.
50 * If you increase the number of cached files very much, you'll need to
51 * add a hash table here.
54 struct raparms
*p_next
;
59 struct file_ra_state p_ra
;
60 unsigned int p_hindex
;
63 struct raparm_hbucket
{
64 struct raparms
*pb_head
;
66 } ____cacheline_aligned_in_smp
;
68 #define RAPARM_HASH_BITS 4
69 #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS)
70 #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1)
71 static struct raparm_hbucket raparm_hash
[RAPARM_HASH_SIZE
];
74 * Called from nfsd_lookup and encode_dirent. Check if we have crossed
76 * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged,
77 * or nfs_ok having possibly changed *dpp and *expp
80 nfsd_cross_mnt(struct svc_rqst
*rqstp
, struct dentry
**dpp
,
81 struct svc_export
**expp
)
83 struct svc_export
*exp
= *expp
, *exp2
= NULL
;
84 struct dentry
*dentry
= *dpp
;
85 struct path path
= {.mnt
= mntget(exp
->ex_path
.mnt
),
86 .dentry
= dget(dentry
)};
89 while (d_mountpoint(path
.dentry
) && follow_down(&path
))
92 exp2
= rqst_exp_get_by_name(rqstp
, &path
);
96 * We normally allow NFS clients to continue
97 * "underneath" a mountpoint that is not exported.
98 * The exception is V4ROOT, where no traversal is ever
99 * allowed without an explicit export of the new
102 if (err
== -ENOENT
&& !(exp
->ex_flags
& NFSEXP_V4ROOT
))
107 if (nfsd_v4client(rqstp
) ||
108 (exp
->ex_flags
& NFSEXP_CROSSMOUNT
) || EX_NOHIDE(exp2
)) {
109 /* successfully crossed mount point */
111 * This is subtle: path.dentry is *not* on path.mnt
112 * at this point. The only reason we are safe is that
113 * original mnt is pinned down by exp, so we should
114 * put path *before* putting exp
117 path
.dentry
= dentry
;
127 static void follow_to_parent(struct path
*path
)
131 while (path
->dentry
== path
->mnt
->mnt_root
&& follow_up(path
))
133 dp
= dget_parent(path
->dentry
);
138 static int nfsd_lookup_parent(struct svc_rqst
*rqstp
, struct dentry
*dparent
, struct svc_export
**exp
, struct dentry
**dentryp
)
140 struct svc_export
*exp2
;
141 struct path path
= {.mnt
= mntget((*exp
)->ex_path
.mnt
),
142 .dentry
= dget(dparent
)};
144 follow_to_parent(&path
);
146 exp2
= rqst_exp_parent(rqstp
, &path
);
147 if (PTR_ERR(exp2
) == -ENOENT
) {
148 *dentryp
= dget(dparent
);
149 } else if (IS_ERR(exp2
)) {
151 return PTR_ERR(exp2
);
153 *dentryp
= dget(path
.dentry
);
162 * For nfsd purposes, we treat V4ROOT exports as though there was an
163 * export at *every* directory.
165 int nfsd_mountpoint(struct dentry
*dentry
, struct svc_export
*exp
)
167 if (d_mountpoint(dentry
))
169 if (!(exp
->ex_flags
& NFSEXP_V4ROOT
))
171 return dentry
->d_inode
!= NULL
;
175 nfsd_lookup_dentry(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
176 const char *name
, unsigned int len
,
177 struct svc_export
**exp_ret
, struct dentry
**dentry_ret
)
179 struct svc_export
*exp
;
180 struct dentry
*dparent
;
181 struct dentry
*dentry
;
185 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp
), len
,name
);
187 /* Obtain dentry and export. */
188 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_EXEC
);
192 dparent
= fhp
->fh_dentry
;
193 exp
= fhp
->fh_export
;
196 /* Lookup the name, but don't follow links */
197 if (isdotent(name
, len
)) {
199 dentry
= dget(dparent
);
200 else if (dparent
!= exp
->ex_path
.dentry
)
201 dentry
= dget_parent(dparent
);
202 else if (!EX_NOHIDE(exp
) && !nfsd_v4client(rqstp
))
203 dentry
= dget(dparent
); /* .. == . just like at / */
205 /* checking mountpoint crossing is very different when stepping up */
206 host_err
= nfsd_lookup_parent(rqstp
, dparent
, &exp
, &dentry
);
212 dentry
= lookup_one_len(name
, dparent
, len
);
213 host_err
= PTR_ERR(dentry
);
217 * check if we have crossed a mount point ...
219 if (nfsd_mountpoint(dentry
, exp
)) {
220 if ((host_err
= nfsd_cross_mnt(rqstp
, &dentry
, &exp
))) {
226 *dentry_ret
= dentry
;
232 return nfserrno(host_err
);
236 * Look up one component of a pathname.
237 * N.B. After this call _both_ fhp and resfh need an fh_put
239 * If the lookup would cross a mountpoint, and the mounted filesystem
240 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
241 * accepted as it stands and the mounted directory is
242 * returned. Otherwise the covered directory is returned.
243 * NOTE: this mountpoint crossing is not supported properly by all
244 * clients and is explicitly disallowed for NFSv3
245 * NeilBrown <neilb@cse.unsw.edu.au>
248 nfsd_lookup(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, const char *name
,
249 unsigned int len
, struct svc_fh
*resfh
)
251 struct svc_export
*exp
;
252 struct dentry
*dentry
;
255 err
= nfsd_lookup_dentry(rqstp
, fhp
, name
, len
, &exp
, &dentry
);
258 err
= check_nfsd_access(exp
, rqstp
);
262 * Note: we compose the file handle now, but as the
263 * dentry may be negative, it may need to be updated.
265 err
= fh_compose(resfh
, exp
, dentry
, fhp
);
266 if (!err
&& !dentry
->d_inode
)
276 * Set various file attributes.
277 * N.B. After this call fhp needs an fh_put
280 nfsd_setattr(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct iattr
*iap
,
281 int check_guard
, time_t guardtime
)
283 struct dentry
*dentry
;
285 int accmode
= NFSD_MAY_SATTR
;
291 if (iap
->ia_valid
& (ATTR_ATIME
| ATTR_MTIME
| ATTR_SIZE
))
292 accmode
|= NFSD_MAY_WRITE
|NFSD_MAY_OWNER_OVERRIDE
;
293 if (iap
->ia_valid
& ATTR_SIZE
)
297 err
= fh_verify(rqstp
, fhp
, ftype
, accmode
);
301 dentry
= fhp
->fh_dentry
;
302 inode
= dentry
->d_inode
;
304 /* Ignore any mode updates on symlinks */
305 if (S_ISLNK(inode
->i_mode
))
306 iap
->ia_valid
&= ~ATTR_MODE
;
312 * NFSv2 does not differentiate between "set-[ac]time-to-now"
313 * which only requires access, and "set-[ac]time-to-X" which
314 * requires ownership.
315 * So if it looks like it might be "set both to the same time which
316 * is close to now", and if inode_change_ok fails, then we
317 * convert to "set to now" instead of "set to explicit time"
319 * We only call inode_change_ok as the last test as technically
320 * it is not an interface that we should be using. It is only
321 * valid if the filesystem does not define it's own i_op->setattr.
323 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
324 #define MAX_TOUCH_TIME_ERROR (30*60)
325 if ((iap
->ia_valid
& BOTH_TIME_SET
) == BOTH_TIME_SET
&&
326 iap
->ia_mtime
.tv_sec
== iap
->ia_atime
.tv_sec
) {
330 * Now just make sure time is in the right ballpark.
331 * Solaris, at least, doesn't seem to care what the time
332 * request is. We require it be within 30 minutes of now.
334 time_t delta
= iap
->ia_atime
.tv_sec
- get_seconds();
337 if (delta
< MAX_TOUCH_TIME_ERROR
&&
338 inode_change_ok(inode
, iap
) != 0) {
340 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
341 * This will cause notify_change to set these times
344 iap
->ia_valid
&= ~BOTH_TIME_SET
;
349 * The size case is special.
350 * It changes the file as well as the attributes.
352 if (iap
->ia_valid
& ATTR_SIZE
) {
353 if (iap
->ia_size
< inode
->i_size
) {
354 err
= nfsd_permission(rqstp
, fhp
->fh_export
, dentry
,
355 NFSD_MAY_TRUNC
|NFSD_MAY_OWNER_OVERRIDE
);
361 * If we are changing the size of the file, then
362 * we need to break all leases.
364 host_err
= break_lease(inode
, FMODE_WRITE
| O_NONBLOCK
);
365 if (host_err
== -EWOULDBLOCK
)
366 host_err
= -ETIMEDOUT
;
367 if (host_err
) /* ENOMEM or EWOULDBLOCK */
370 host_err
= get_write_access(inode
);
375 host_err
= locks_verify_truncate(inode
, NULL
, iap
->ia_size
);
377 put_write_access(inode
);
383 /* sanitize the mode change */
384 if (iap
->ia_valid
& ATTR_MODE
) {
385 iap
->ia_mode
&= S_IALLUGO
;
386 iap
->ia_mode
|= (inode
->i_mode
& ~S_IALLUGO
);
389 /* Revoke setuid/setgid on chown */
390 if (!S_ISDIR(inode
->i_mode
) &&
391 (((iap
->ia_valid
& ATTR_UID
) && iap
->ia_uid
!= inode
->i_uid
) ||
392 ((iap
->ia_valid
& ATTR_GID
) && iap
->ia_gid
!= inode
->i_gid
))) {
393 iap
->ia_valid
|= ATTR_KILL_PRIV
;
394 if (iap
->ia_valid
& ATTR_MODE
) {
395 /* we're setting mode too, just clear the s*id bits */
396 iap
->ia_mode
&= ~S_ISUID
;
397 if (iap
->ia_mode
& S_IXGRP
)
398 iap
->ia_mode
&= ~S_ISGID
;
400 /* set ATTR_KILL_* bits and let VFS handle it */
401 iap
->ia_valid
|= (ATTR_KILL_SUID
| ATTR_KILL_SGID
);
405 /* Change the attributes. */
407 iap
->ia_valid
|= ATTR_CTIME
;
409 err
= nfserr_notsync
;
410 if (!check_guard
|| guardtime
== inode
->i_ctime
.tv_sec
) {
412 host_err
= notify_change(dentry
, iap
);
413 err
= nfserrno(host_err
);
417 put_write_access(inode
);
419 if (EX_ISSYNC(fhp
->fh_export
))
420 write_inode_now(inode
, 1);
425 err
= nfserrno(host_err
);
429 #if defined(CONFIG_NFSD_V2_ACL) || \
430 defined(CONFIG_NFSD_V3_ACL) || \
431 defined(CONFIG_NFSD_V4)
432 static ssize_t
nfsd_getxattr(struct dentry
*dentry
, char *key
, void **buf
)
437 buflen
= vfs_getxattr(dentry
, key
, NULL
, 0);
441 *buf
= kmalloc(buflen
, GFP_KERNEL
);
445 ret
= vfs_getxattr(dentry
, key
, *buf
, buflen
);
452 #if defined(CONFIG_NFSD_V4)
454 set_nfsv4_acl_one(struct dentry
*dentry
, struct posix_acl
*pacl
, char *key
)
461 buflen
= posix_acl_xattr_size(pacl
->a_count
);
462 buf
= kmalloc(buflen
, GFP_KERNEL
);
467 len
= posix_acl_to_xattr(pacl
, buf
, buflen
);
473 error
= vfs_setxattr(dentry
, key
, buf
, len
, 0);
480 nfsd4_set_nfs4_acl(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
481 struct nfs4_acl
*acl
)
485 struct dentry
*dentry
;
487 struct posix_acl
*pacl
= NULL
, *dpacl
= NULL
;
488 unsigned int flags
= 0;
491 error
= fh_verify(rqstp
, fhp
, 0 /* S_IFREG */, NFSD_MAY_SATTR
);
495 dentry
= fhp
->fh_dentry
;
496 inode
= dentry
->d_inode
;
497 if (S_ISDIR(inode
->i_mode
))
498 flags
= NFS4_ACL_DIR
;
500 host_error
= nfs4_acl_nfsv4_to_posix(acl
, &pacl
, &dpacl
, flags
);
501 if (host_error
== -EINVAL
) {
502 return nfserr_attrnotsupp
;
503 } else if (host_error
< 0)
506 host_error
= set_nfsv4_acl_one(dentry
, pacl
, POSIX_ACL_XATTR_ACCESS
);
510 if (S_ISDIR(inode
->i_mode
))
511 host_error
= set_nfsv4_acl_one(dentry
, dpacl
, POSIX_ACL_XATTR_DEFAULT
);
514 posix_acl_release(pacl
);
515 posix_acl_release(dpacl
);
517 if (host_error
== -EOPNOTSUPP
)
518 return nfserr_attrnotsupp
;
520 return nfserrno(host_error
);
523 static struct posix_acl
*
524 _get_posix_acl(struct dentry
*dentry
, char *key
)
527 struct posix_acl
*pacl
= NULL
;
530 buflen
= nfsd_getxattr(dentry
, key
, &buf
);
534 return ERR_PTR(buflen
);
536 pacl
= posix_acl_from_xattr(buf
, buflen
);
542 nfsd4_get_nfs4_acl(struct svc_rqst
*rqstp
, struct dentry
*dentry
, struct nfs4_acl
**acl
)
544 struct inode
*inode
= dentry
->d_inode
;
546 struct posix_acl
*pacl
= NULL
, *dpacl
= NULL
;
547 unsigned int flags
= 0;
549 pacl
= _get_posix_acl(dentry
, POSIX_ACL_XATTR_ACCESS
);
550 if (IS_ERR(pacl
) && PTR_ERR(pacl
) == -ENODATA
)
551 pacl
= posix_acl_from_mode(inode
->i_mode
, GFP_KERNEL
);
553 error
= PTR_ERR(pacl
);
558 if (S_ISDIR(inode
->i_mode
)) {
559 dpacl
= _get_posix_acl(dentry
, POSIX_ACL_XATTR_DEFAULT
);
560 if (IS_ERR(dpacl
) && PTR_ERR(dpacl
) == -ENODATA
)
562 else if (IS_ERR(dpacl
)) {
563 error
= PTR_ERR(dpacl
);
567 flags
= NFS4_ACL_DIR
;
570 *acl
= nfs4_acl_posix_to_nfsv4(pacl
, dpacl
, flags
);
572 error
= PTR_ERR(*acl
);
576 posix_acl_release(pacl
);
577 posix_acl_release(dpacl
);
581 #endif /* defined(CONFIG_NFS_V4) */
583 #ifdef CONFIG_NFSD_V3
585 * Check server access rights to a file system object
591 static struct accessmap nfs3_regaccess
[] = {
592 { NFS3_ACCESS_READ
, NFSD_MAY_READ
},
593 { NFS3_ACCESS_EXECUTE
, NFSD_MAY_EXEC
},
594 { NFS3_ACCESS_MODIFY
, NFSD_MAY_WRITE
|NFSD_MAY_TRUNC
},
595 { NFS3_ACCESS_EXTEND
, NFSD_MAY_WRITE
},
600 static struct accessmap nfs3_diraccess
[] = {
601 { NFS3_ACCESS_READ
, NFSD_MAY_READ
},
602 { NFS3_ACCESS_LOOKUP
, NFSD_MAY_EXEC
},
603 { NFS3_ACCESS_MODIFY
, NFSD_MAY_EXEC
|NFSD_MAY_WRITE
|NFSD_MAY_TRUNC
},
604 { NFS3_ACCESS_EXTEND
, NFSD_MAY_EXEC
|NFSD_MAY_WRITE
},
605 { NFS3_ACCESS_DELETE
, NFSD_MAY_REMOVE
},
610 static struct accessmap nfs3_anyaccess
[] = {
611 /* Some clients - Solaris 2.6 at least, make an access call
612 * to the server to check for access for things like /dev/null
613 * (which really, the server doesn't care about). So
614 * We provide simple access checking for them, looking
615 * mainly at mode bits, and we make sure to ignore read-only
618 { NFS3_ACCESS_READ
, NFSD_MAY_READ
},
619 { NFS3_ACCESS_EXECUTE
, NFSD_MAY_EXEC
},
620 { NFS3_ACCESS_MODIFY
, NFSD_MAY_WRITE
|NFSD_MAY_LOCAL_ACCESS
},
621 { NFS3_ACCESS_EXTEND
, NFSD_MAY_WRITE
|NFSD_MAY_LOCAL_ACCESS
},
627 nfsd_access(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, u32
*access
, u32
*supported
)
629 struct accessmap
*map
;
630 struct svc_export
*export
;
631 struct dentry
*dentry
;
632 u32 query
, result
= 0, sresult
= 0;
635 error
= fh_verify(rqstp
, fhp
, 0, NFSD_MAY_NOP
);
639 export
= fhp
->fh_export
;
640 dentry
= fhp
->fh_dentry
;
642 if (S_ISREG(dentry
->d_inode
->i_mode
))
643 map
= nfs3_regaccess
;
644 else if (S_ISDIR(dentry
->d_inode
->i_mode
))
645 map
= nfs3_diraccess
;
647 map
= nfs3_anyaccess
;
651 for (; map
->access
; map
++) {
652 if (map
->access
& query
) {
655 sresult
|= map
->access
;
657 err2
= nfsd_permission(rqstp
, export
, dentry
, map
->how
);
660 result
|= map
->access
;
663 /* the following error codes just mean the access was not allowed,
664 * rather than an error occurred */
668 /* simply don't "or" in the access bit. */
678 *supported
= sresult
;
683 #endif /* CONFIG_NFSD_V3 */
688 * Open an existing file or directory.
689 * The access argument indicates the type of open (read/write/lock)
690 * N.B. After this call fhp needs an fh_put
693 nfsd_open(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, int type
,
694 int access
, struct file
**filp
)
696 struct dentry
*dentry
;
698 int flags
= O_RDONLY
|O_LARGEFILE
;
702 validate_process_creds();
705 * If we get here, then the client has already done an "open",
706 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
707 * in case a chmod has now revoked permission.
709 err
= fh_verify(rqstp
, fhp
, type
, access
| NFSD_MAY_OWNER_OVERRIDE
);
713 dentry
= fhp
->fh_dentry
;
714 inode
= dentry
->d_inode
;
716 /* Disallow write access to files with the append-only bit set
717 * or any access when mandatory locking enabled
720 if (IS_APPEND(inode
) && (access
& NFSD_MAY_WRITE
))
723 * We must ignore files (but only files) which might have mandatory
724 * locks on them because there is no way to know if the accesser has
727 if (S_ISREG((inode
)->i_mode
) && mandatory_lock(inode
))
734 * Check to see if there are any leases on this file.
735 * This may block while leases are broken.
737 host_err
= break_lease(inode
, O_NONBLOCK
| ((access
& NFSD_MAY_WRITE
) ? FMODE_WRITE
: 0));
738 if (host_err
== -EWOULDBLOCK
)
739 host_err
= -ETIMEDOUT
;
740 if (host_err
) /* NOMEM or WOULDBLOCK */
743 if (access
& NFSD_MAY_WRITE
) {
744 if (access
& NFSD_MAY_READ
)
745 flags
= O_RDWR
|O_LARGEFILE
;
747 flags
= O_WRONLY
|O_LARGEFILE
;
751 *filp
= dentry_open(dget(dentry
), mntget(fhp
->fh_export
->ex_path
.mnt
),
752 flags
, current_cred());
754 host_err
= PTR_ERR(*filp
);
755 host_err
= ima_file_check(*filp
, access
);
757 err
= nfserrno(host_err
);
759 validate_process_creds();
767 nfsd_close(struct file
*filp
)
774 * As this calls fsync (not fdatasync) there is no need for a write_inode
777 static inline int nfsd_dosync(struct file
*filp
, struct dentry
*dp
,
778 const struct file_operations
*fop
)
780 struct inode
*inode
= dp
->d_inode
;
781 int (*fsync
) (struct file
*, struct dentry
*, int);
784 err
= filemap_write_and_wait(inode
->i_mapping
);
785 if (err
== 0 && fop
&& (fsync
= fop
->fsync
))
786 err
= fsync(filp
, dp
, 0);
791 nfsd_sync(struct file
*filp
)
794 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
795 dprintk("nfsd: sync file %s\n", filp
->f_path
.dentry
->d_name
.name
);
796 mutex_lock(&inode
->i_mutex
);
797 err
=nfsd_dosync(filp
, filp
->f_path
.dentry
, filp
->f_op
);
798 mutex_unlock(&inode
->i_mutex
);
804 nfsd_sync_dir(struct dentry
*dp
)
806 return nfsd_dosync(NULL
, dp
, dp
->d_inode
->i_fop
);
810 * Obtain the readahead parameters for the file
811 * specified by (dev, ino).
814 static inline struct raparms
*
815 nfsd_get_raparms(dev_t dev
, ino_t ino
)
817 struct raparms
*ra
, **rap
, **frap
= NULL
;
820 struct raparm_hbucket
*rab
;
822 hash
= jhash_2words(dev
, ino
, 0xfeedbeef) & RAPARM_HASH_MASK
;
823 rab
= &raparm_hash
[hash
];
825 spin_lock(&rab
->pb_lock
);
826 for (rap
= &rab
->pb_head
; (ra
= *rap
); rap
= &ra
->p_next
) {
827 if (ra
->p_ino
== ino
&& ra
->p_dev
== dev
)
830 if (ra
->p_count
== 0)
833 depth
= nfsdstats
.ra_size
*11/10;
835 spin_unlock(&rab
->pb_lock
);
845 if (rap
!= &rab
->pb_head
) {
847 ra
->p_next
= rab
->pb_head
;
851 nfsdstats
.ra_depth
[depth
*10/nfsdstats
.ra_size
]++;
852 spin_unlock(&rab
->pb_lock
);
857 * Grab and keep cached pages associated with a file in the svc_rqst
858 * so that they can be passed to the network sendmsg/sendpage routines
859 * directly. They will be released after the sending has completed.
862 nfsd_splice_actor(struct pipe_inode_info
*pipe
, struct pipe_buffer
*buf
,
863 struct splice_desc
*sd
)
865 struct svc_rqst
*rqstp
= sd
->u
.data
;
866 struct page
**pp
= rqstp
->rq_respages
+ rqstp
->rq_resused
;
867 struct page
*page
= buf
->page
;
871 ret
= buf
->ops
->confirm(pipe
, buf
);
877 if (rqstp
->rq_res
.page_len
== 0) {
882 rqstp
->rq_res
.page_base
= buf
->offset
;
883 rqstp
->rq_res
.page_len
= size
;
884 } else if (page
!= pp
[-1]) {
890 rqstp
->rq_res
.page_len
+= size
;
892 rqstp
->rq_res
.page_len
+= size
;
897 static int nfsd_direct_splice_actor(struct pipe_inode_info
*pipe
,
898 struct splice_desc
*sd
)
900 return __splice_from_pipe(pipe
, sd
, nfsd_splice_actor
);
903 static inline int svc_msnfs(struct svc_fh
*ffhp
)
906 return (ffhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
);
913 nfsd_vfs_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
914 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long *count
)
923 inode
= file
->f_path
.dentry
->d_inode
;
925 if (svc_msnfs(fhp
) && !lock_may_read(inode
, offset
, *count
))
928 /* Get readahead parameters */
929 ra
= nfsd_get_raparms(inode
->i_sb
->s_dev
, inode
->i_ino
);
932 file
->f_ra
= ra
->p_ra
;
934 if (file
->f_op
->splice_read
&& rqstp
->rq_splice_ok
) {
935 struct splice_desc sd
= {
942 rqstp
->rq_resused
= 1;
943 host_err
= splice_direct_to_actor(file
, &sd
, nfsd_direct_splice_actor
);
947 host_err
= vfs_readv(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
951 /* Write back readahead params */
953 struct raparm_hbucket
*rab
= &raparm_hash
[ra
->p_hindex
];
954 spin_lock(&rab
->pb_lock
);
955 ra
->p_ra
= file
->f_ra
;
958 spin_unlock(&rab
->pb_lock
);
962 nfsdstats
.io_read
+= host_err
;
965 fsnotify_access(file
->f_path
.dentry
);
967 err
= nfserrno(host_err
);
972 static void kill_suid(struct dentry
*dentry
)
975 ia
.ia_valid
= ATTR_KILL_SUID
| ATTR_KILL_SGID
| ATTR_KILL_PRIV
;
977 mutex_lock(&dentry
->d_inode
->i_mutex
);
978 notify_change(dentry
, &ia
);
979 mutex_unlock(&dentry
->d_inode
->i_mutex
);
983 * Gathered writes: If another process is currently writing to the file,
984 * there's a high chance this is another nfsd (triggered by a bulk write
985 * from a client's biod). Rather than syncing the file with each write
986 * request, we sleep for 10 msec.
988 * I don't know if this roughly approximates C. Juszak's idea of
989 * gathered writes, but it's a nice and simple solution (IMHO), and it
992 * Note: we do this only in the NFSv2 case, since v3 and higher have a
993 * better tool (separate unstable writes and commits) for solving this
996 static int wait_for_concurrent_writes(struct file
*file
)
998 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
999 static ino_t last_ino
;
1000 static dev_t last_dev
;
1003 if (atomic_read(&inode
->i_writecount
) > 1
1004 || (last_ino
== inode
->i_ino
&& last_dev
== inode
->i_sb
->s_dev
)) {
1005 dprintk("nfsd: write defer %d\n", task_pid_nr(current
));
1007 dprintk("nfsd: write resume %d\n", task_pid_nr(current
));
1010 if (inode
->i_state
& I_DIRTY
) {
1011 dprintk("nfsd: write sync %d\n", task_pid_nr(current
));
1012 err
= nfsd_sync(file
);
1014 last_ino
= inode
->i_ino
;
1015 last_dev
= inode
->i_sb
->s_dev
;
1020 nfsd_vfs_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1021 loff_t offset
, struct kvec
*vec
, int vlen
,
1022 unsigned long *cnt
, int *stablep
)
1024 struct svc_export
*exp
;
1025 struct dentry
*dentry
;
1026 struct inode
*inode
;
1030 int stable
= *stablep
;
1036 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
1037 (!lock_may_write(file
->f_path
.dentry
->d_inode
, offset
, *cnt
)))
1041 dentry
= file
->f_path
.dentry
;
1042 inode
= dentry
->d_inode
;
1043 exp
= fhp
->fh_export
;
1046 * Request sync writes if
1047 * - the sync export option has been set, or
1048 * - the client requested O_SYNC behavior (NFSv3 feature).
1049 * - The file system doesn't support fsync().
1050 * When NFSv2 gathered writes have been configured for this volume,
1051 * flushing the data to disk is handled separately below.
1053 use_wgather
= (rqstp
->rq_vers
== 2) && EX_WGATHER(exp
);
1055 if (!file
->f_op
->fsync
) {/* COMMIT3 cannot work */
1057 *stablep
= 2; /* FILE_SYNC */
1060 if (!EX_ISSYNC(exp
))
1062 if (stable
&& !use_wgather
) {
1063 spin_lock(&file
->f_lock
);
1064 file
->f_flags
|= O_SYNC
;
1065 spin_unlock(&file
->f_lock
);
1068 /* Write the data. */
1069 oldfs
= get_fs(); set_fs(KERNEL_DS
);
1070 host_err
= vfs_writev(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
1075 nfsdstats
.io_write
+= host_err
;
1076 fsnotify_modify(file
->f_path
.dentry
);
1078 /* clear setuid/setgid flag after write */
1079 if (inode
->i_mode
& (S_ISUID
| S_ISGID
))
1082 if (stable
&& use_wgather
)
1083 host_err
= wait_for_concurrent_writes(file
);
1086 dprintk("nfsd: write complete host_err=%d\n", host_err
);
1090 err
= nfserrno(host_err
);
1096 * Read data from a file. count must contain the requested read count
1097 * on entry. On return, *count contains the number of bytes actually read.
1098 * N.B. After this call fhp needs an fh_put
1101 nfsd_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1102 loff_t offset
, struct kvec
*vec
, int vlen
,
1103 unsigned long *count
)
1108 err
= nfsd_permission(rqstp
, fhp
->fh_export
, fhp
->fh_dentry
,
1109 NFSD_MAY_READ
|NFSD_MAY_OWNER_OVERRIDE
);
1112 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
1114 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, NFSD_MAY_READ
, &file
);
1117 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
1125 * Write data to a file.
1126 * The stable flag requests synchronous writes.
1127 * N.B. After this call fhp needs an fh_put
1130 nfsd_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1131 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long *cnt
,
1137 err
= nfsd_permission(rqstp
, fhp
->fh_export
, fhp
->fh_dentry
,
1138 NFSD_MAY_WRITE
|NFSD_MAY_OWNER_OVERRIDE
);
1141 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
, cnt
,
1144 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, NFSD_MAY_WRITE
, &file
);
1149 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
,
1157 #ifdef CONFIG_NFSD_V3
1159 * Commit all pending writes to stable storage.
1160 * Strictly speaking, we could sync just the indicated file region here,
1161 * but there's currently no way we can ask the VFS to do so.
1163 * Unfortunately we cannot lock the file to make sure we return full WCC
1164 * data to the client, as locking happens lower down in the filesystem.
1167 nfsd_commit(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1168 loff_t offset
, unsigned long count
)
1173 if ((u64
)count
> ~(u64
)offset
)
1174 return nfserr_inval
;
1176 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, NFSD_MAY_WRITE
, &file
);
1179 if (EX_ISSYNC(fhp
->fh_export
)) {
1180 if (file
->f_op
&& file
->f_op
->fsync
) {
1181 err
= nfserrno(nfsd_sync(file
));
1183 err
= nfserr_notsupp
;
1190 #endif /* CONFIG_NFSD_V3 */
1193 nfsd_create_setattr(struct svc_rqst
*rqstp
, struct svc_fh
*resfhp
,
1197 * Mode has already been set earlier in create:
1199 iap
->ia_valid
&= ~ATTR_MODE
;
1201 * Setting uid/gid works only for root. Irix appears to
1202 * send along the gid on create when it tries to implement
1203 * setgid directories via NFS:
1205 if (current_fsuid() != 0)
1206 iap
->ia_valid
&= ~(ATTR_UID
|ATTR_GID
);
1208 return nfsd_setattr(rqstp
, resfhp
, iap
, 0, (time_t)0);
1212 /* HPUX client sometimes creates a file in mode 000, and sets size to 0.
1213 * setting size to 0 may fail for some specific file systems by the permission
1214 * checking which requires WRITE permission but the mode is 000.
1215 * we ignore the resizing(to 0) on the just new created file, since the size is
1216 * 0 after file created.
1218 * call this only after vfs_create() is called.
1221 nfsd_check_ignore_resizing(struct iattr
*iap
)
1223 if ((iap
->ia_valid
& ATTR_SIZE
) && (iap
->ia_size
== 0))
1224 iap
->ia_valid
&= ~ATTR_SIZE
;
1228 * Create a file (regular, directory, device, fifo); UNIX sockets
1229 * not yet implemented.
1230 * If the response fh has been verified, the parent directory should
1231 * already be locked. Note that the parent directory is left locked.
1233 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1236 nfsd_create(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1237 char *fname
, int flen
, struct iattr
*iap
,
1238 int type
, dev_t rdev
, struct svc_fh
*resfhp
)
1240 struct dentry
*dentry
, *dchild
= NULL
;
1250 if (isdotent(fname
, flen
))
1253 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_CREATE
);
1257 dentry
= fhp
->fh_dentry
;
1258 dirp
= dentry
->d_inode
;
1260 err
= nfserr_notdir
;
1261 if (!dirp
->i_op
->lookup
)
1264 * Check whether the response file handle has been verified yet.
1265 * If it has, the parent directory should already be locked.
1267 if (!resfhp
->fh_dentry
) {
1268 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1269 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1270 dchild
= lookup_one_len(fname
, dentry
, flen
);
1271 host_err
= PTR_ERR(dchild
);
1274 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1278 /* called from nfsd_proc_create */
1279 dchild
= dget(resfhp
->fh_dentry
);
1280 if (!fhp
->fh_locked
) {
1281 /* not actually possible */
1283 "nfsd_create: parent %s/%s not locked!\n",
1284 dentry
->d_parent
->d_name
.name
,
1285 dentry
->d_name
.name
);
1291 * Make sure the child dentry is still negative ...
1294 if (dchild
->d_inode
) {
1295 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1296 dentry
->d_name
.name
, dchild
->d_name
.name
);
1300 if (!(iap
->ia_valid
& ATTR_MODE
))
1302 iap
->ia_mode
= (iap
->ia_mode
& S_IALLUGO
) | type
;
1305 if (!S_ISREG(type
) && !S_ISDIR(type
) && !special_file(type
)) {
1306 printk(KERN_WARNING
"nfsd: bad file type %o in nfsd_create\n",
1311 host_err
= mnt_want_write(fhp
->fh_export
->ex_path
.mnt
);
1316 * Get the dir op function pointer.
1321 host_err
= vfs_create(dirp
, dchild
, iap
->ia_mode
, NULL
);
1323 nfsd_check_ignore_resizing(iap
);
1326 host_err
= vfs_mkdir(dirp
, dchild
, iap
->ia_mode
);
1332 host_err
= vfs_mknod(dirp
, dchild
, iap
->ia_mode
, rdev
);
1336 mnt_drop_write(fhp
->fh_export
->ex_path
.mnt
);
1340 if (EX_ISSYNC(fhp
->fh_export
)) {
1341 err
= nfserrno(nfsd_sync_dir(dentry
));
1342 write_inode_now(dchild
->d_inode
, 1);
1345 err2
= nfsd_create_setattr(rqstp
, resfhp
, iap
);
1348 mnt_drop_write(fhp
->fh_export
->ex_path
.mnt
);
1350 * Update the file handle to get the new inode info.
1353 err
= fh_update(resfhp
);
1355 if (dchild
&& !IS_ERR(dchild
))
1360 err
= nfserrno(host_err
);
1364 #ifdef CONFIG_NFSD_V3
1366 * NFSv3 version of nfsd_create
1369 nfsd_create_v3(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1370 char *fname
, int flen
, struct iattr
*iap
,
1371 struct svc_fh
*resfhp
, int createmode
, u32
*verifier
,
1372 int *truncp
, int *created
)
1374 struct dentry
*dentry
, *dchild
= NULL
;
1379 __u32 v_mtime
=0, v_atime
=0;
1385 if (isdotent(fname
, flen
))
1387 if (!(iap
->ia_valid
& ATTR_MODE
))
1389 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_CREATE
);
1393 dentry
= fhp
->fh_dentry
;
1394 dirp
= dentry
->d_inode
;
1396 /* Get all the sanity checks out of the way before
1397 * we lock the parent. */
1398 err
= nfserr_notdir
;
1399 if (!dirp
->i_op
->lookup
)
1401 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1404 * Compose the response file handle.
1406 dchild
= lookup_one_len(fname
, dentry
, flen
);
1407 host_err
= PTR_ERR(dchild
);
1411 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1415 if (createmode
== NFS3_CREATE_EXCLUSIVE
) {
1416 /* solaris7 gets confused (bugid 4218508) if these have
1417 * the high bit set, so just clear the high bits. If this is
1418 * ever changed to use different attrs for storing the
1419 * verifier, then do_open_lookup() will also need to be fixed
1422 v_mtime
= verifier
[0]&0x7fffffff;
1423 v_atime
= verifier
[1]&0x7fffffff;
1426 host_err
= mnt_want_write(fhp
->fh_export
->ex_path
.mnt
);
1429 if (dchild
->d_inode
) {
1432 switch (createmode
) {
1433 case NFS3_CREATE_UNCHECKED
:
1434 if (! S_ISREG(dchild
->d_inode
->i_mode
))
1437 /* in nfsv4, we need to treat this case a little
1438 * differently. we don't want to truncate the
1439 * file now; this would be wrong if the OPEN
1440 * fails for some other reason. furthermore,
1441 * if the size is nonzero, we should ignore it
1442 * according to spec!
1444 *truncp
= (iap
->ia_valid
& ATTR_SIZE
) && !iap
->ia_size
;
1447 iap
->ia_valid
&= ATTR_SIZE
;
1451 case NFS3_CREATE_EXCLUSIVE
:
1452 if ( dchild
->d_inode
->i_mtime
.tv_sec
== v_mtime
1453 && dchild
->d_inode
->i_atime
.tv_sec
== v_atime
1454 && dchild
->d_inode
->i_size
== 0 )
1457 case NFS3_CREATE_GUARDED
:
1460 mnt_drop_write(fhp
->fh_export
->ex_path
.mnt
);
1464 host_err
= vfs_create(dirp
, dchild
, iap
->ia_mode
, NULL
);
1466 mnt_drop_write(fhp
->fh_export
->ex_path
.mnt
);
1472 if (EX_ISSYNC(fhp
->fh_export
)) {
1473 err
= nfserrno(nfsd_sync_dir(dentry
));
1474 /* setattr will sync the child (or not) */
1477 nfsd_check_ignore_resizing(iap
);
1479 if (createmode
== NFS3_CREATE_EXCLUSIVE
) {
1480 /* Cram the verifier into atime/mtime */
1481 iap
->ia_valid
= ATTR_MTIME
|ATTR_ATIME
1482 | ATTR_MTIME_SET
|ATTR_ATIME_SET
;
1483 /* XXX someone who knows this better please fix it for nsec */
1484 iap
->ia_mtime
.tv_sec
= v_mtime
;
1485 iap
->ia_atime
.tv_sec
= v_atime
;
1486 iap
->ia_mtime
.tv_nsec
= 0;
1487 iap
->ia_atime
.tv_nsec
= 0;
1491 err2
= nfsd_create_setattr(rqstp
, resfhp
, iap
);
1495 mnt_drop_write(fhp
->fh_export
->ex_path
.mnt
);
1497 * Update the filehandle to get the new inode info.
1500 err
= fh_update(resfhp
);
1504 if (dchild
&& !IS_ERR(dchild
))
1509 err
= nfserrno(host_err
);
1512 #endif /* CONFIG_NFSD_V3 */
1515 * Read a symlink. On entry, *lenp must contain the maximum path length that
1516 * fits into the buffer. On return, it contains the true length.
1517 * N.B. After this call fhp needs an fh_put
1520 nfsd_readlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, char *buf
, int *lenp
)
1522 struct dentry
*dentry
;
1523 struct inode
*inode
;
1528 err
= fh_verify(rqstp
, fhp
, S_IFLNK
, NFSD_MAY_NOP
);
1532 dentry
= fhp
->fh_dentry
;
1533 inode
= dentry
->d_inode
;
1536 if (!inode
->i_op
->readlink
)
1539 touch_atime(fhp
->fh_export
->ex_path
.mnt
, dentry
);
1540 /* N.B. Why does this call need a get_fs()??
1541 * Remove the set_fs and watch the fireworks:-) --okir
1544 oldfs
= get_fs(); set_fs(KERNEL_DS
);
1545 host_err
= inode
->i_op
->readlink(dentry
, buf
, *lenp
);
1556 err
= nfserrno(host_err
);
1561 * Create a symlink and look up its inode
1562 * N.B. After this call _both_ fhp and resfhp need an fh_put
1565 nfsd_symlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1566 char *fname
, int flen
,
1567 char *path
, int plen
,
1568 struct svc_fh
*resfhp
,
1571 struct dentry
*dentry
, *dnew
;
1579 if (isdotent(fname
, flen
))
1582 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_CREATE
);
1586 dentry
= fhp
->fh_dentry
;
1587 dnew
= lookup_one_len(fname
, dentry
, flen
);
1588 host_err
= PTR_ERR(dnew
);
1592 host_err
= mnt_want_write(fhp
->fh_export
->ex_path
.mnt
);
1596 if (unlikely(path
[plen
] != 0)) {
1597 char *path_alloced
= kmalloc(plen
+1, GFP_KERNEL
);
1598 if (path_alloced
== NULL
)
1601 strncpy(path_alloced
, path
, plen
);
1602 path_alloced
[plen
] = 0;
1603 host_err
= vfs_symlink(dentry
->d_inode
, dnew
, path_alloced
);
1604 kfree(path_alloced
);
1607 host_err
= vfs_symlink(dentry
->d_inode
, dnew
, path
);
1610 if (EX_ISSYNC(fhp
->fh_export
))
1611 host_err
= nfsd_sync_dir(dentry
);
1613 err
= nfserrno(host_err
);
1616 mnt_drop_write(fhp
->fh_export
->ex_path
.mnt
);
1618 cerr
= fh_compose(resfhp
, fhp
->fh_export
, dnew
, fhp
);
1620 if (err
==0) err
= cerr
;
1625 err
= nfserrno(host_err
);
1631 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1634 nfsd_link(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
,
1635 char *name
, int len
, struct svc_fh
*tfhp
)
1637 struct dentry
*ddir
, *dnew
, *dold
;
1638 struct inode
*dirp
, *dest
;
1642 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, NFSD_MAY_CREATE
);
1645 err
= fh_verify(rqstp
, tfhp
, -S_IFDIR
, NFSD_MAY_NOP
);
1653 if (isdotent(name
, len
))
1656 fh_lock_nested(ffhp
, I_MUTEX_PARENT
);
1657 ddir
= ffhp
->fh_dentry
;
1658 dirp
= ddir
->d_inode
;
1660 dnew
= lookup_one_len(name
, ddir
, len
);
1661 host_err
= PTR_ERR(dnew
);
1665 dold
= tfhp
->fh_dentry
;
1666 dest
= dold
->d_inode
;
1668 host_err
= mnt_want_write(tfhp
->fh_export
->ex_path
.mnt
);
1670 err
= nfserrno(host_err
);
1673 host_err
= vfs_link(dold
, dirp
, dnew
);
1675 if (EX_ISSYNC(ffhp
->fh_export
)) {
1676 err
= nfserrno(nfsd_sync_dir(ddir
));
1677 write_inode_now(dest
, 1);
1681 if (host_err
== -EXDEV
&& rqstp
->rq_vers
== 2)
1684 err
= nfserrno(host_err
);
1686 mnt_drop_write(tfhp
->fh_export
->ex_path
.mnt
);
1695 err
= nfserrno(host_err
);
1701 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1704 nfsd_rename(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
, char *fname
, int flen
,
1705 struct svc_fh
*tfhp
, char *tname
, int tlen
)
1707 struct dentry
*fdentry
, *tdentry
, *odentry
, *ndentry
, *trap
;
1708 struct inode
*fdir
, *tdir
;
1712 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, NFSD_MAY_REMOVE
);
1715 err
= fh_verify(rqstp
, tfhp
, S_IFDIR
, NFSD_MAY_CREATE
);
1719 fdentry
= ffhp
->fh_dentry
;
1720 fdir
= fdentry
->d_inode
;
1722 tdentry
= tfhp
->fh_dentry
;
1723 tdir
= tdentry
->d_inode
;
1725 err
= (rqstp
->rq_vers
== 2) ? nfserr_acces
: nfserr_xdev
;
1726 if (ffhp
->fh_export
!= tfhp
->fh_export
)
1730 if (!flen
|| isdotent(fname
, flen
) || !tlen
|| isdotent(tname
, tlen
))
1733 /* cannot use fh_lock as we need deadlock protective ordering
1734 * so do it by hand */
1735 trap
= lock_rename(tdentry
, fdentry
);
1736 ffhp
->fh_locked
= tfhp
->fh_locked
= 1;
1740 odentry
= lookup_one_len(fname
, fdentry
, flen
);
1741 host_err
= PTR_ERR(odentry
);
1742 if (IS_ERR(odentry
))
1746 if (!odentry
->d_inode
)
1749 if (odentry
== trap
)
1752 ndentry
= lookup_one_len(tname
, tdentry
, tlen
);
1753 host_err
= PTR_ERR(ndentry
);
1754 if (IS_ERR(ndentry
))
1756 host_err
= -ENOTEMPTY
;
1757 if (ndentry
== trap
)
1760 if (svc_msnfs(ffhp
) &&
1761 ((atomic_read(&odentry
->d_count
) > 1)
1762 || (atomic_read(&ndentry
->d_count
) > 1))) {
1768 if (ffhp
->fh_export
->ex_path
.mnt
!= tfhp
->fh_export
->ex_path
.mnt
)
1770 host_err
= mnt_want_write(ffhp
->fh_export
->ex_path
.mnt
);
1774 host_err
= vfs_rename(fdir
, odentry
, tdir
, ndentry
);
1775 if (!host_err
&& EX_ISSYNC(tfhp
->fh_export
)) {
1776 host_err
= nfsd_sync_dir(tdentry
);
1778 host_err
= nfsd_sync_dir(fdentry
);
1781 mnt_drop_write(ffhp
->fh_export
->ex_path
.mnt
);
1788 err
= nfserrno(host_err
);
1790 /* we cannot reply on fh_unlock on the two filehandles,
1791 * as that would do the wrong thing if the two directories
1792 * were the same, so again we do it by hand
1794 fill_post_wcc(ffhp
);
1795 fill_post_wcc(tfhp
);
1796 unlock_rename(tdentry
, fdentry
);
1797 ffhp
->fh_locked
= tfhp
->fh_locked
= 0;
1804 * Unlink a file or directory
1805 * N.B. After this call fhp needs an fh_put
1808 nfsd_unlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, int type
,
1809 char *fname
, int flen
)
1811 struct dentry
*dentry
, *rdentry
;
1817 if (!flen
|| isdotent(fname
, flen
))
1819 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_REMOVE
);
1823 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1824 dentry
= fhp
->fh_dentry
;
1825 dirp
= dentry
->d_inode
;
1827 rdentry
= lookup_one_len(fname
, dentry
, flen
);
1828 host_err
= PTR_ERR(rdentry
);
1829 if (IS_ERR(rdentry
))
1832 if (!rdentry
->d_inode
) {
1839 type
= rdentry
->d_inode
->i_mode
& S_IFMT
;
1841 host_err
= mnt_want_write(fhp
->fh_export
->ex_path
.mnt
);
1845 if (type
!= S_IFDIR
) { /* It's UNLINK */
1847 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
1848 (atomic_read(&rdentry
->d_count
) > 1)) {
1852 host_err
= vfs_unlink(dirp
, rdentry
);
1853 } else { /* It's RMDIR */
1854 host_err
= vfs_rmdir(dirp
, rdentry
);
1861 if (EX_ISSYNC(fhp
->fh_export
))
1862 host_err
= nfsd_sync_dir(dentry
);
1865 mnt_drop_write(fhp
->fh_export
->ex_path
.mnt
);
1867 err
= nfserrno(host_err
);
1873 * We do this buffering because we must not call back into the file
1874 * system's ->lookup() method from the filldir callback. That may well
1875 * deadlock a number of file systems.
1877 * This is based heavily on the implementation of same in XFS.
1879 struct buffered_dirent
{
1883 unsigned int d_type
;
1887 struct readdir_data
{
1893 static int nfsd_buffered_filldir(void *__buf
, const char *name
, int namlen
,
1894 loff_t offset
, u64 ino
, unsigned int d_type
)
1896 struct readdir_data
*buf
= __buf
;
1897 struct buffered_dirent
*de
= (void *)(buf
->dirent
+ buf
->used
);
1898 unsigned int reclen
;
1900 reclen
= ALIGN(sizeof(struct buffered_dirent
) + namlen
, sizeof(u64
));
1901 if (buf
->used
+ reclen
> PAGE_SIZE
) {
1906 de
->namlen
= namlen
;
1907 de
->offset
= offset
;
1909 de
->d_type
= d_type
;
1910 memcpy(de
->name
, name
, namlen
);
1911 buf
->used
+= reclen
;
1916 static __be32
nfsd_buffered_readdir(struct file
*file
, filldir_t func
,
1917 struct readdir_cd
*cdp
, loff_t
*offsetp
)
1919 struct readdir_data buf
;
1920 struct buffered_dirent
*de
;
1925 buf
.dirent
= (void *)__get_free_page(GFP_KERNEL
);
1927 return nfserrno(-ENOMEM
);
1932 struct inode
*dir_inode
= file
->f_path
.dentry
->d_inode
;
1933 unsigned int reclen
;
1935 cdp
->err
= nfserr_eof
; /* will be cleared on successful read */
1939 host_err
= vfs_readdir(file
, nfsd_buffered_filldir
, &buf
);
1952 * Various filldir functions may end up calling back into
1953 * lookup_one_len() and the file system's ->lookup() method.
1954 * These expect i_mutex to be held, as it would within readdir.
1956 host_err
= mutex_lock_killable(&dir_inode
->i_mutex
);
1960 de
= (struct buffered_dirent
*)buf
.dirent
;
1962 offset
= de
->offset
;
1964 if (func(cdp
, de
->name
, de
->namlen
, de
->offset
,
1965 de
->ino
, de
->d_type
))
1968 if (cdp
->err
!= nfs_ok
)
1971 reclen
= ALIGN(sizeof(*de
) + de
->namlen
,
1974 de
= (struct buffered_dirent
*)((char *)de
+ reclen
);
1976 mutex_unlock(&dir_inode
->i_mutex
);
1977 if (size
> 0) /* We bailed out early */
1980 offset
= vfs_llseek(file
, 0, SEEK_CUR
);
1983 free_page((unsigned long)(buf
.dirent
));
1986 return nfserrno(host_err
);
1993 * Read entries from a directory.
1994 * The NFSv3/4 verifier we ignore for now.
1997 nfsd_readdir(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, loff_t
*offsetp
,
1998 struct readdir_cd
*cdp
, filldir_t func
)
2002 loff_t offset
= *offsetp
;
2004 err
= nfsd_open(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_READ
, &file
);
2008 offset
= vfs_llseek(file
, offset
, 0);
2010 err
= nfserrno((int)offset
);
2014 err
= nfsd_buffered_readdir(file
, func
, cdp
, offsetp
);
2016 if (err
== nfserr_eof
|| err
== nfserr_toosmall
)
2017 err
= nfs_ok
; /* can still be found in ->err */
2025 * Get file system stats
2026 * N.B. After this call fhp needs an fh_put
2029 nfsd_statfs(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct kstatfs
*stat
, int access
)
2031 __be32 err
= fh_verify(rqstp
, fhp
, 0, NFSD_MAY_NOP
| access
);
2032 if (!err
&& vfs_statfs(fhp
->fh_dentry
,stat
))
2037 static int exp_rdonly(struct svc_rqst
*rqstp
, struct svc_export
*exp
)
2039 return nfsexp_flags(rqstp
, exp
) & NFSEXP_READONLY
;
2043 * Check for a user's access permissions to this inode.
2046 nfsd_permission(struct svc_rqst
*rqstp
, struct svc_export
*exp
,
2047 struct dentry
*dentry
, int acc
)
2049 struct inode
*inode
= dentry
->d_inode
;
2053 if (acc
== NFSD_MAY_NOP
)
2056 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
2058 (acc
& NFSD_MAY_READ
)? " read" : "",
2059 (acc
& NFSD_MAY_WRITE
)? " write" : "",
2060 (acc
& NFSD_MAY_EXEC
)? " exec" : "",
2061 (acc
& NFSD_MAY_SATTR
)? " sattr" : "",
2062 (acc
& NFSD_MAY_TRUNC
)? " trunc" : "",
2063 (acc
& NFSD_MAY_LOCK
)? " lock" : "",
2064 (acc
& NFSD_MAY_OWNER_OVERRIDE
)? " owneroverride" : "",
2066 IS_IMMUTABLE(inode
)? " immut" : "",
2067 IS_APPEND(inode
)? " append" : "",
2068 __mnt_is_readonly(exp
->ex_path
.mnt
)? " ro" : "");
2069 dprintk(" owner %d/%d user %d/%d\n",
2070 inode
->i_uid
, inode
->i_gid
, current_fsuid(), current_fsgid());
2073 /* Normally we reject any write/sattr etc access on a read-only file
2074 * system. But if it is IRIX doing check on write-access for a
2075 * device special file, we ignore rofs.
2077 if (!(acc
& NFSD_MAY_LOCAL_ACCESS
))
2078 if (acc
& (NFSD_MAY_WRITE
| NFSD_MAY_SATTR
| NFSD_MAY_TRUNC
)) {
2079 if (exp_rdonly(rqstp
, exp
) ||
2080 __mnt_is_readonly(exp
->ex_path
.mnt
))
2082 if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode
))
2085 if ((acc
& NFSD_MAY_TRUNC
) && IS_APPEND(inode
))
2088 if (acc
& NFSD_MAY_LOCK
) {
2089 /* If we cannot rely on authentication in NLM requests,
2090 * just allow locks, otherwise require read permission, or
2093 if (exp
->ex_flags
& NFSEXP_NOAUTHNLM
)
2096 acc
= NFSD_MAY_READ
| NFSD_MAY_OWNER_OVERRIDE
;
2099 * The file owner always gets access permission for accesses that
2100 * would normally be checked at open time. This is to make
2101 * file access work even when the client has done a fchmod(fd, 0).
2103 * However, `cp foo bar' should fail nevertheless when bar is
2104 * readonly. A sensible way to do this might be to reject all
2105 * attempts to truncate a read-only file, because a creat() call
2106 * always implies file truncation.
2107 * ... but this isn't really fair. A process may reasonably call
2108 * ftruncate on an open file descriptor on a file with perm 000.
2109 * We must trust the client to do permission checking - using "ACCESS"
2112 if ((acc
& NFSD_MAY_OWNER_OVERRIDE
) &&
2113 inode
->i_uid
== current_fsuid())
2116 /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */
2117 err
= inode_permission(inode
, acc
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
));
2119 /* Allow read access to binaries even when mode 111 */
2120 if (err
== -EACCES
&& S_ISREG(inode
->i_mode
) &&
2121 acc
== (NFSD_MAY_READ
| NFSD_MAY_OWNER_OVERRIDE
))
2122 err
= inode_permission(inode
, MAY_EXEC
);
2126 /* Do integrity (permission) checking now, but defer incrementing
2127 * IMA counts to the actual file open.
2129 path
.mnt
= exp
->ex_path
.mnt
;
2130 path
.dentry
= dentry
;
2132 return err
? nfserrno(err
) : 0;
2136 nfsd_racache_shutdown(void)
2138 struct raparms
*raparm
, *last_raparm
;
2141 dprintk("nfsd: freeing readahead buffers.\n");
2143 for (i
= 0; i
< RAPARM_HASH_SIZE
; i
++) {
2144 raparm
= raparm_hash
[i
].pb_head
;
2146 last_raparm
= raparm
;
2147 raparm
= raparm
->p_next
;
2150 raparm_hash
[i
].pb_head
= NULL
;
2154 * Initialize readahead param cache
2157 nfsd_racache_init(int cache_size
)
2162 struct raparms
**raparm
= NULL
;
2165 if (raparm_hash
[0].pb_head
)
2167 nperbucket
= DIV_ROUND_UP(cache_size
, RAPARM_HASH_SIZE
);
2170 cache_size
= nperbucket
* RAPARM_HASH_SIZE
;
2172 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size
);
2174 for (i
= 0; i
< RAPARM_HASH_SIZE
; i
++) {
2175 spin_lock_init(&raparm_hash
[i
].pb_lock
);
2177 raparm
= &raparm_hash
[i
].pb_head
;
2178 for (j
= 0; j
< nperbucket
; j
++) {
2179 *raparm
= kzalloc(sizeof(struct raparms
), GFP_KERNEL
);
2182 raparm
= &(*raparm
)->p_next
;
2187 nfsdstats
.ra_size
= cache_size
;
2191 dprintk("nfsd: kmalloc failed, freeing readahead buffers\n");
2192 nfsd_racache_shutdown();
2196 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
2198 nfsd_get_posix_acl(struct svc_fh
*fhp
, int type
)
2200 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
2204 struct posix_acl
*acl
;
2206 if (!IS_POSIXACL(inode
))
2207 return ERR_PTR(-EOPNOTSUPP
);
2210 case ACL_TYPE_ACCESS
:
2211 name
= POSIX_ACL_XATTR_ACCESS
;
2213 case ACL_TYPE_DEFAULT
:
2214 name
= POSIX_ACL_XATTR_DEFAULT
;
2217 return ERR_PTR(-EOPNOTSUPP
);
2220 size
= nfsd_getxattr(fhp
->fh_dentry
, name
, &value
);
2222 return ERR_PTR(size
);
2224 acl
= posix_acl_from_xattr(value
, size
);
2230 nfsd_set_posix_acl(struct svc_fh
*fhp
, int type
, struct posix_acl
*acl
)
2232 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
2238 if (!IS_POSIXACL(inode
) ||
2239 !inode
->i_op
->setxattr
|| !inode
->i_op
->removexattr
)
2242 case ACL_TYPE_ACCESS
:
2243 name
= POSIX_ACL_XATTR_ACCESS
;
2245 case ACL_TYPE_DEFAULT
:
2246 name
= POSIX_ACL_XATTR_DEFAULT
;
2252 if (acl
&& acl
->a_count
) {
2253 size
= posix_acl_xattr_size(acl
->a_count
);
2254 value
= kmalloc(size
, GFP_KERNEL
);
2257 error
= posix_acl_to_xattr(acl
, value
, size
);
2264 error
= mnt_want_write(fhp
->fh_export
->ex_path
.mnt
);
2268 error
= vfs_setxattr(fhp
->fh_dentry
, name
, value
, size
, 0);
2270 if (!S_ISDIR(inode
->i_mode
) && type
== ACL_TYPE_DEFAULT
)
2273 error
= vfs_removexattr(fhp
->fh_dentry
, name
);
2274 if (error
== -ENODATA
)
2278 mnt_drop_write(fhp
->fh_export
->ex_path
.mnt
);
2284 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */