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/splice.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
64 /* We must ignore files (but only files) which might have mandatory
65 * locks on them because there is no way to know if the accesser has
68 #define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i))
71 * This is a cache of readahead params that help us choose the proper
72 * readahead strategy. Initially, we set all readahead parameters to 0
73 * and let the VFS handle things.
74 * If you increase the number of cached files very much, you'll need to
75 * add a hash table here.
78 struct raparms
*p_next
;
83 struct file_ra_state p_ra
;
84 unsigned int p_hindex
;
87 struct raparm_hbucket
{
88 struct raparms
*pb_head
;
90 } ____cacheline_aligned_in_smp
;
92 static struct raparms
* raparml
;
93 #define RAPARM_HASH_BITS 4
94 #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS)
95 #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1)
96 static struct raparm_hbucket raparm_hash
[RAPARM_HASH_SIZE
];
99 * Called from nfsd_lookup and encode_dirent. Check if we have crossed
101 * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged,
102 * or nfs_ok having possibly changed *dpp and *expp
105 nfsd_cross_mnt(struct svc_rqst
*rqstp
, struct dentry
**dpp
,
106 struct svc_export
**expp
)
108 struct svc_export
*exp
= *expp
, *exp2
= NULL
;
109 struct dentry
*dentry
= *dpp
;
110 struct vfsmount
*mnt
= mntget(exp
->ex_mnt
);
111 struct dentry
*mounts
= dget(dentry
);
114 while (follow_down(&mnt
,&mounts
)&&d_mountpoint(mounts
));
116 exp2
= rqst_exp_get_by_name(rqstp
, mnt
, mounts
);
123 if (exp2
&& ((exp
->ex_flags
& NFSEXP_CROSSMOUNT
) || EX_NOHIDE(exp2
))) {
124 /* successfully crossed mount point */
130 if (exp2
) exp_put(exp2
);
139 * Look up one component of a pathname.
140 * N.B. After this call _both_ fhp and resfh need an fh_put
142 * If the lookup would cross a mountpoint, and the mounted filesystem
143 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
144 * accepted as it stands and the mounted directory is
145 * returned. Otherwise the covered directory is returned.
146 * NOTE: this mountpoint crossing is not supported properly by all
147 * clients and is explicitly disallowed for NFSv3
148 * NeilBrown <neilb@cse.unsw.edu.au>
151 nfsd_lookup(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, const char *name
,
152 int len
, struct svc_fh
*resfh
)
154 struct svc_export
*exp
;
155 struct dentry
*dparent
;
156 struct dentry
*dentry
;
160 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp
), len
,name
);
162 /* Obtain dentry and export. */
163 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_EXEC
);
167 dparent
= fhp
->fh_dentry
;
168 exp
= fhp
->fh_export
;
171 /* Lookup the name, but don't follow links */
172 if (isdotent(name
, len
)) {
174 dentry
= dget(dparent
);
175 else if (dparent
!= exp
->ex_dentry
) {
176 dentry
= dget_parent(dparent
);
177 } else if (!EX_NOHIDE(exp
))
178 dentry
= dget(dparent
); /* .. == . just like at / */
180 /* checking mountpoint crossing is very different when stepping up */
181 struct svc_export
*exp2
= NULL
;
183 struct vfsmount
*mnt
= mntget(exp
->ex_mnt
);
184 dentry
= dget(dparent
);
185 while(dentry
== mnt
->mnt_root
&& follow_up(&mnt
, &dentry
))
187 dp
= dget_parent(dentry
);
191 exp2
= rqst_exp_parent(rqstp
, mnt
, dentry
);
192 if (PTR_ERR(exp2
) == -ENOENT
) {
194 dentry
= dget(dparent
);
195 } else if (IS_ERR(exp2
)) {
196 host_err
= PTR_ERR(exp2
);
208 dentry
= lookup_one_len(name
, dparent
, len
);
209 host_err
= PTR_ERR(dentry
);
213 * check if we have crossed a mount point ...
215 if (d_mountpoint(dentry
)) {
216 if ((host_err
= nfsd_cross_mnt(rqstp
, &dentry
, &exp
))) {
223 * Note: we compose the file handle now, but as the
224 * dentry may be negative, it may need to be updated.
226 err
= fh_compose(resfh
, exp
, dentry
, fhp
);
227 if (!err
&& !dentry
->d_inode
)
235 err
= nfserrno(host_err
);
240 * Set various file attributes.
241 * N.B. After this call fhp needs an fh_put
244 nfsd_setattr(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct iattr
*iap
,
245 int check_guard
, time_t guardtime
)
247 struct dentry
*dentry
;
249 int accmode
= MAY_SATTR
;
256 if (iap
->ia_valid
& (ATTR_ATIME
| ATTR_MTIME
| ATTR_SIZE
))
257 accmode
|= MAY_WRITE
|MAY_OWNER_OVERRIDE
;
258 if (iap
->ia_valid
& ATTR_SIZE
)
262 err
= fh_verify(rqstp
, fhp
, ftype
, accmode
);
266 dentry
= fhp
->fh_dentry
;
267 inode
= dentry
->d_inode
;
269 /* Ignore any mode updates on symlinks */
270 if (S_ISLNK(inode
->i_mode
))
271 iap
->ia_valid
&= ~ATTR_MODE
;
276 /* NFSv2 does not differentiate between "set-[ac]time-to-now"
277 * which only requires access, and "set-[ac]time-to-X" which
278 * requires ownership.
279 * So if it looks like it might be "set both to the same time which
280 * is close to now", and if inode_change_ok fails, then we
281 * convert to "set to now" instead of "set to explicit time"
283 * We only call inode_change_ok as the last test as technically
284 * it is not an interface that we should be using. It is only
285 * valid if the filesystem does not define it's own i_op->setattr.
287 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
288 #define MAX_TOUCH_TIME_ERROR (30*60)
289 if ((iap
->ia_valid
& BOTH_TIME_SET
) == BOTH_TIME_SET
290 && iap
->ia_mtime
.tv_sec
== iap
->ia_atime
.tv_sec
292 /* Looks probable. Now just make sure time is in the right ballpark.
293 * Solaris, at least, doesn't seem to care what the time request is.
294 * We require it be within 30 minutes of now.
296 time_t delta
= iap
->ia_atime
.tv_sec
- get_seconds();
297 if (delta
<0) delta
= -delta
;
298 if (delta
< MAX_TOUCH_TIME_ERROR
&&
299 inode_change_ok(inode
, iap
) != 0) {
300 /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
301 * this will cause notify_change to set these times to "now"
303 iap
->ia_valid
&= ~BOTH_TIME_SET
;
307 /* The size case is special. It changes the file as well as the attributes. */
308 if (iap
->ia_valid
& ATTR_SIZE
) {
309 if (iap
->ia_size
< inode
->i_size
) {
310 err
= nfsd_permission(fhp
->fh_export
, dentry
, MAY_TRUNC
|MAY_OWNER_OVERRIDE
);
316 * If we are changing the size of the file, then
317 * we need to break all leases.
319 host_err
= break_lease(inode
, FMODE_WRITE
| O_NONBLOCK
);
320 if (host_err
== -EWOULDBLOCK
)
321 host_err
= -ETIMEDOUT
;
322 if (host_err
) /* ENOMEM or EWOULDBLOCK */
325 host_err
= get_write_access(inode
);
330 host_err
= locks_verify_truncate(inode
, NULL
, iap
->ia_size
);
332 put_write_access(inode
);
338 imode
= inode
->i_mode
;
339 if (iap
->ia_valid
& ATTR_MODE
) {
340 iap
->ia_mode
&= S_IALLUGO
;
341 imode
= iap
->ia_mode
|= (imode
& ~S_IALLUGO
);
344 /* Revoke setuid/setgid bit on chown/chgrp */
345 if ((iap
->ia_valid
& ATTR_UID
) && iap
->ia_uid
!= inode
->i_uid
)
346 iap
->ia_valid
|= ATTR_KILL_SUID
;
347 if ((iap
->ia_valid
& ATTR_GID
) && iap
->ia_gid
!= inode
->i_gid
)
348 iap
->ia_valid
|= ATTR_KILL_SGID
;
350 /* Change the attributes. */
352 iap
->ia_valid
|= ATTR_CTIME
;
354 err
= nfserr_notsync
;
355 if (!check_guard
|| guardtime
== inode
->i_ctime
.tv_sec
) {
357 host_err
= notify_change(dentry
, iap
);
358 err
= nfserrno(host_err
);
362 put_write_access(inode
);
364 if (EX_ISSYNC(fhp
->fh_export
))
365 write_inode_now(inode
, 1);
370 err
= nfserrno(host_err
);
374 #if defined(CONFIG_NFSD_V2_ACL) || \
375 defined(CONFIG_NFSD_V3_ACL) || \
376 defined(CONFIG_NFSD_V4)
377 static ssize_t
nfsd_getxattr(struct dentry
*dentry
, char *key
, void **buf
)
381 buflen
= vfs_getxattr(dentry
, key
, NULL
, 0);
385 *buf
= kmalloc(buflen
, GFP_KERNEL
);
389 return vfs_getxattr(dentry
, key
, *buf
, buflen
);
393 #if defined(CONFIG_NFSD_V4)
395 set_nfsv4_acl_one(struct dentry
*dentry
, struct posix_acl
*pacl
, char *key
)
402 buflen
= posix_acl_xattr_size(pacl
->a_count
);
403 buf
= kmalloc(buflen
, GFP_KERNEL
);
408 len
= posix_acl_to_xattr(pacl
, buf
, buflen
);
414 error
= vfs_setxattr(dentry
, key
, buf
, len
, 0);
421 nfsd4_set_nfs4_acl(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
422 struct nfs4_acl
*acl
)
426 struct dentry
*dentry
;
428 struct posix_acl
*pacl
= NULL
, *dpacl
= NULL
;
429 unsigned int flags
= 0;
432 error
= fh_verify(rqstp
, fhp
, 0 /* S_IFREG */, MAY_SATTR
);
436 dentry
= fhp
->fh_dentry
;
437 inode
= dentry
->d_inode
;
438 if (S_ISDIR(inode
->i_mode
))
439 flags
= NFS4_ACL_DIR
;
441 host_error
= nfs4_acl_nfsv4_to_posix(acl
, &pacl
, &dpacl
, flags
);
442 if (host_error
== -EINVAL
) {
443 return nfserr_attrnotsupp
;
444 } else if (host_error
< 0)
447 host_error
= set_nfsv4_acl_one(dentry
, pacl
, POSIX_ACL_XATTR_ACCESS
);
451 if (S_ISDIR(inode
->i_mode
))
452 host_error
= set_nfsv4_acl_one(dentry
, dpacl
, POSIX_ACL_XATTR_DEFAULT
);
455 posix_acl_release(pacl
);
456 posix_acl_release(dpacl
);
458 if (host_error
== -EOPNOTSUPP
)
459 return nfserr_attrnotsupp
;
461 return nfserrno(host_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
;
644 * If we get here, then the client has already done an "open",
645 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
646 * in case a chmod has now revoked permission.
648 err
= fh_verify(rqstp
, fhp
, type
, access
| MAY_OWNER_OVERRIDE
);
652 dentry
= fhp
->fh_dentry
;
653 inode
= dentry
->d_inode
;
655 /* Disallow write access to files with the append-only bit set
656 * or any access when mandatory locking enabled
659 if (IS_APPEND(inode
) && (access
& MAY_WRITE
))
661 if (IS_ISMNDLK(inode
))
668 * Check to see if there are any leases on this file.
669 * This may block while leases are broken.
671 host_err
= break_lease(inode
, O_NONBLOCK
| ((access
& MAY_WRITE
) ? FMODE_WRITE
: 0));
672 if (host_err
== -EWOULDBLOCK
)
673 host_err
= -ETIMEDOUT
;
674 if (host_err
) /* NOMEM or WOULDBLOCK */
677 if (access
& MAY_WRITE
) {
678 if (access
& MAY_READ
)
679 flags
= O_RDWR
|O_LARGEFILE
;
681 flags
= O_WRONLY
|O_LARGEFILE
;
685 *filp
= dentry_open(dget(dentry
), mntget(fhp
->fh_export
->ex_mnt
), flags
);
687 host_err
= PTR_ERR(*filp
);
689 err
= nfserrno(host_err
);
698 nfsd_close(struct file
*filp
)
705 * As this calls fsync (not fdatasync) there is no need for a write_inode
708 static inline int nfsd_dosync(struct file
*filp
, struct dentry
*dp
,
709 const struct file_operations
*fop
)
711 struct inode
*inode
= dp
->d_inode
;
712 int (*fsync
) (struct file
*, struct dentry
*, int);
715 err
= filemap_fdatawrite(inode
->i_mapping
);
716 if (err
== 0 && fop
&& (fsync
= fop
->fsync
))
717 err
= fsync(filp
, dp
, 0);
719 err
= filemap_fdatawait(inode
->i_mapping
);
726 nfsd_sync(struct file
*filp
)
729 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
730 dprintk("nfsd: sync file %s\n", filp
->f_path
.dentry
->d_name
.name
);
731 mutex_lock(&inode
->i_mutex
);
732 err
=nfsd_dosync(filp
, filp
->f_path
.dentry
, filp
->f_op
);
733 mutex_unlock(&inode
->i_mutex
);
739 nfsd_sync_dir(struct dentry
*dp
)
741 return nfsd_dosync(NULL
, dp
, dp
->d_inode
->i_fop
);
745 * Obtain the readahead parameters for the file
746 * specified by (dev, ino).
749 static inline struct raparms
*
750 nfsd_get_raparms(dev_t dev
, ino_t ino
)
752 struct raparms
*ra
, **rap
, **frap
= NULL
;
755 struct raparm_hbucket
*rab
;
757 hash
= jhash_2words(dev
, ino
, 0xfeedbeef) & RAPARM_HASH_MASK
;
758 rab
= &raparm_hash
[hash
];
760 spin_lock(&rab
->pb_lock
);
761 for (rap
= &rab
->pb_head
; (ra
= *rap
); rap
= &ra
->p_next
) {
762 if (ra
->p_ino
== ino
&& ra
->p_dev
== dev
)
765 if (ra
->p_count
== 0)
768 depth
= nfsdstats
.ra_size
*11/10;
770 spin_unlock(&rab
->pb_lock
);
780 if (rap
!= &rab
->pb_head
) {
782 ra
->p_next
= rab
->pb_head
;
786 nfsdstats
.ra_depth
[depth
*10/nfsdstats
.ra_size
]++;
787 spin_unlock(&rab
->pb_lock
);
792 * Grab and keep cached pages associated with a file in the svc_rqst
793 * so that they can be passed to the network sendmsg/sendpage routines
794 * directly. They will be released after the sending has completed.
797 nfsd_splice_actor(struct pipe_inode_info
*pipe
, struct pipe_buffer
*buf
,
798 struct splice_desc
*sd
)
800 struct svc_rqst
*rqstp
= sd
->u
.data
;
801 struct page
**pp
= rqstp
->rq_respages
+ rqstp
->rq_resused
;
802 struct page
*page
= buf
->page
;
806 ret
= buf
->ops
->confirm(pipe
, buf
);
812 if (rqstp
->rq_res
.page_len
== 0) {
817 rqstp
->rq_res
.page_base
= buf
->offset
;
818 rqstp
->rq_res
.page_len
= size
;
819 } else if (page
!= pp
[-1]) {
825 rqstp
->rq_res
.page_len
+= size
;
827 rqstp
->rq_res
.page_len
+= size
;
832 static int nfsd_direct_splice_actor(struct pipe_inode_info
*pipe
,
833 struct splice_desc
*sd
)
835 return __splice_from_pipe(pipe
, sd
, nfsd_splice_actor
);
839 nfsd_vfs_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
840 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long *count
)
849 inode
= file
->f_path
.dentry
->d_inode
;
851 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
852 (!lock_may_read(inode
, offset
, *count
)))
856 /* Get readahead parameters */
857 ra
= nfsd_get_raparms(inode
->i_sb
->s_dev
, inode
->i_ino
);
860 file
->f_ra
= ra
->p_ra
;
862 if (file
->f_op
->splice_read
&& rqstp
->rq_splice_ok
) {
863 struct splice_desc sd
= {
870 rqstp
->rq_resused
= 1;
871 host_err
= splice_direct_to_actor(file
, &sd
, nfsd_direct_splice_actor
);
875 host_err
= vfs_readv(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
879 /* Write back readahead params */
881 struct raparm_hbucket
*rab
= &raparm_hash
[ra
->p_hindex
];
882 spin_lock(&rab
->pb_lock
);
883 ra
->p_ra
= file
->f_ra
;
886 spin_unlock(&rab
->pb_lock
);
890 nfsdstats
.io_read
+= host_err
;
893 fsnotify_access(file
->f_path
.dentry
);
895 err
= nfserrno(host_err
);
900 static void kill_suid(struct dentry
*dentry
)
903 ia
.ia_valid
= ATTR_KILL_SUID
| ATTR_KILL_SGID
;
905 mutex_lock(&dentry
->d_inode
->i_mutex
);
906 notify_change(dentry
, &ia
);
907 mutex_unlock(&dentry
->d_inode
->i_mutex
);
911 nfsd_vfs_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
912 loff_t offset
, struct kvec
*vec
, int vlen
,
913 unsigned long cnt
, int *stablep
)
915 struct svc_export
*exp
;
916 struct dentry
*dentry
;
921 int stable
= *stablep
;
926 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
927 (!lock_may_write(file
->f_path
.dentry
->d_inode
, offset
, cnt
)))
931 dentry
= file
->f_path
.dentry
;
932 inode
= dentry
->d_inode
;
933 exp
= fhp
->fh_export
;
936 * Request sync writes if
937 * - the sync export option has been set, or
938 * - the client requested O_SYNC behavior (NFSv3 feature).
939 * - The file system doesn't support fsync().
940 * When gathered writes have been configured for this volume,
941 * flushing the data to disk is handled separately below.
944 if (file
->f_op
->fsync
== 0) {/* COMMIT3 cannot work */
946 *stablep
= 2; /* FILE_SYNC */
951 if (stable
&& !EX_WGATHER(exp
))
952 file
->f_flags
|= O_SYNC
;
954 /* Write the data. */
955 oldfs
= get_fs(); set_fs(KERNEL_DS
);
956 host_err
= vfs_writev(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
959 nfsdstats
.io_write
+= cnt
;
960 fsnotify_modify(file
->f_path
.dentry
);
963 /* clear setuid/setgid flag after write */
964 if (host_err
>= 0 && (inode
->i_mode
& (S_ISUID
| S_ISGID
)))
967 if (host_err
>= 0 && stable
) {
968 static ino_t last_ino
;
969 static dev_t last_dev
;
972 * Gathered writes: If another process is currently
973 * writing to the file, there's a high chance
974 * this is another nfsd (triggered by a bulk write
975 * from a client's biod). Rather than syncing the
976 * file with each write request, we sleep for 10 msec.
978 * I don't know if this roughly approximates
979 * C. Juszak's idea of gathered writes, but it's a
980 * nice and simple solution (IMHO), and it seems to
983 if (EX_WGATHER(exp
)) {
984 if (atomic_read(&inode
->i_writecount
) > 1
985 || (last_ino
== inode
->i_ino
&& last_dev
== inode
->i_sb
->s_dev
)) {
986 dprintk("nfsd: write defer %d\n", current
->pid
);
988 dprintk("nfsd: write resume %d\n", current
->pid
);
991 if (inode
->i_state
& I_DIRTY
) {
992 dprintk("nfsd: write sync %d\n", current
->pid
);
993 host_err
=nfsd_sync(file
);
996 wake_up(&inode
->i_wait
);
999 last_ino
= inode
->i_ino
;
1000 last_dev
= inode
->i_sb
->s_dev
;
1003 dprintk("nfsd: write complete host_err=%d\n", host_err
);
1007 err
= nfserrno(host_err
);
1013 * Read data from a file. count must contain the requested read count
1014 * on entry. On return, *count contains the number of bytes actually read.
1015 * N.B. After this call fhp needs an fh_put
1018 nfsd_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1019 loff_t offset
, struct kvec
*vec
, int vlen
,
1020 unsigned long *count
)
1025 err
= nfsd_permission(fhp
->fh_export
, fhp
->fh_dentry
,
1026 MAY_READ
|MAY_OWNER_OVERRIDE
);
1029 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
1031 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_READ
, &file
);
1034 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
1042 * Write data to a file.
1043 * The stable flag requests synchronous writes.
1044 * N.B. After this call fhp needs an fh_put
1047 nfsd_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1048 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long cnt
,
1054 err
= nfsd_permission(fhp
->fh_export
, fhp
->fh_dentry
,
1055 MAY_WRITE
|MAY_OWNER_OVERRIDE
);
1058 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
, cnt
,
1061 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_WRITE
, &file
);
1066 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
,
1074 #ifdef CONFIG_NFSD_V3
1076 * Commit all pending writes to stable storage.
1077 * Strictly speaking, we could sync just the indicated file region here,
1078 * but there's currently no way we can ask the VFS to do so.
1080 * Unfortunately we cannot lock the file to make sure we return full WCC
1081 * data to the client, as locking happens lower down in the filesystem.
1084 nfsd_commit(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1085 loff_t offset
, unsigned long count
)
1090 if ((u64
)count
> ~(u64
)offset
)
1091 return nfserr_inval
;
1093 if ((err
= nfsd_open(rqstp
, fhp
, S_IFREG
, MAY_WRITE
, &file
)) != 0)
1095 if (EX_ISSYNC(fhp
->fh_export
)) {
1096 if (file
->f_op
&& file
->f_op
->fsync
) {
1097 err
= nfserrno(nfsd_sync(file
));
1099 err
= nfserr_notsupp
;
1106 #endif /* CONFIG_NFSD_V3 */
1109 * Create a file (regular, directory, device, fifo); UNIX sockets
1110 * not yet implemented.
1111 * If the response fh has been verified, the parent directory should
1112 * already be locked. Note that the parent directory is left locked.
1114 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1117 nfsd_create(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1118 char *fname
, int flen
, struct iattr
*iap
,
1119 int type
, dev_t rdev
, struct svc_fh
*resfhp
)
1121 struct dentry
*dentry
, *dchild
= NULL
;
1130 if (isdotent(fname
, flen
))
1133 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1137 dentry
= fhp
->fh_dentry
;
1138 dirp
= dentry
->d_inode
;
1140 err
= nfserr_notdir
;
1141 if(!dirp
->i_op
|| !dirp
->i_op
->lookup
)
1144 * Check whether the response file handle has been verified yet.
1145 * If it has, the parent directory should already be locked.
1147 if (!resfhp
->fh_dentry
) {
1148 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1149 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1150 dchild
= lookup_one_len(fname
, dentry
, flen
);
1151 host_err
= PTR_ERR(dchild
);
1154 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1158 /* called from nfsd_proc_create */
1159 dchild
= dget(resfhp
->fh_dentry
);
1160 if (!fhp
->fh_locked
) {
1161 /* not actually possible */
1163 "nfsd_create: parent %s/%s not locked!\n",
1164 dentry
->d_parent
->d_name
.name
,
1165 dentry
->d_name
.name
);
1171 * Make sure the child dentry is still negative ...
1174 if (dchild
->d_inode
) {
1175 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1176 dentry
->d_name
.name
, dchild
->d_name
.name
);
1180 if (!(iap
->ia_valid
& ATTR_MODE
))
1182 iap
->ia_mode
= (iap
->ia_mode
& S_IALLUGO
) | type
;
1185 * Get the dir op function pointer.
1190 host_err
= vfs_create(dirp
, dchild
, iap
->ia_mode
, NULL
);
1193 host_err
= vfs_mkdir(dirp
, dchild
, iap
->ia_mode
);
1199 host_err
= vfs_mknod(dirp
, dchild
, iap
->ia_mode
, rdev
);
1202 printk("nfsd: bad file type %o in nfsd_create\n", type
);
1208 if (EX_ISSYNC(fhp
->fh_export
)) {
1209 err
= nfserrno(nfsd_sync_dir(dentry
));
1210 write_inode_now(dchild
->d_inode
, 1);
1214 /* Set file attributes. Mode has already been set and
1215 * setting uid/gid works only for root. Irix appears to
1216 * send along the gid when it tries to implement setgid
1217 * directories via NFS.
1219 if ((iap
->ia_valid
&= ~(ATTR_UID
|ATTR_GID
|ATTR_MODE
)) != 0) {
1220 __be32 err2
= nfsd_setattr(rqstp
, resfhp
, iap
, 0, (time_t)0);
1225 * Update the file handle to get the new inode info.
1228 err
= fh_update(resfhp
);
1230 if (dchild
&& !IS_ERR(dchild
))
1235 err
= nfserrno(host_err
);
1239 #ifdef CONFIG_NFSD_V3
1241 * NFSv3 version of nfsd_create
1244 nfsd_create_v3(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1245 char *fname
, int flen
, struct iattr
*iap
,
1246 struct svc_fh
*resfhp
, int createmode
, u32
*verifier
,
1247 int *truncp
, int *created
)
1249 struct dentry
*dentry
, *dchild
= NULL
;
1253 __u32 v_mtime
=0, v_atime
=0;
1259 if (isdotent(fname
, flen
))
1261 if (!(iap
->ia_valid
& ATTR_MODE
))
1263 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1267 dentry
= fhp
->fh_dentry
;
1268 dirp
= dentry
->d_inode
;
1270 /* Get all the sanity checks out of the way before
1271 * we lock the parent. */
1272 err
= nfserr_notdir
;
1273 if(!dirp
->i_op
|| !dirp
->i_op
->lookup
)
1275 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1278 * Compose the response file handle.
1280 dchild
= lookup_one_len(fname
, dentry
, flen
);
1281 host_err
= PTR_ERR(dchild
);
1285 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1289 if (createmode
== NFS3_CREATE_EXCLUSIVE
) {
1290 /* solaris7 gets confused (bugid 4218508) if these have
1291 * the high bit set, so just clear the high bits.
1293 v_mtime
= verifier
[0]&0x7fffffff;
1294 v_atime
= verifier
[1]&0x7fffffff;
1297 if (dchild
->d_inode
) {
1300 switch (createmode
) {
1301 case NFS3_CREATE_UNCHECKED
:
1302 if (! S_ISREG(dchild
->d_inode
->i_mode
))
1305 /* in nfsv4, we need to treat this case a little
1306 * differently. we don't want to truncate the
1307 * file now; this would be wrong if the OPEN
1308 * fails for some other reason. furthermore,
1309 * if the size is nonzero, we should ignore it
1310 * according to spec!
1312 *truncp
= (iap
->ia_valid
& ATTR_SIZE
) && !iap
->ia_size
;
1315 iap
->ia_valid
&= ATTR_SIZE
;
1319 case NFS3_CREATE_EXCLUSIVE
:
1320 if ( dchild
->d_inode
->i_mtime
.tv_sec
== v_mtime
1321 && dchild
->d_inode
->i_atime
.tv_sec
== v_atime
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 */
1344 iap
->ia_valid
= ATTR_MTIME
|ATTR_ATIME
1345 | ATTR_MTIME_SET
|ATTR_ATIME_SET
;
1346 /* XXX someone who knows this better please fix it for nsec */
1347 iap
->ia_mtime
.tv_sec
= v_mtime
;
1348 iap
->ia_atime
.tv_sec
= v_atime
;
1349 iap
->ia_mtime
.tv_nsec
= 0;
1350 iap
->ia_atime
.tv_nsec
= 0;
1353 /* Set file attributes.
1354 * Irix appears to send along the gid when it tries to
1355 * implement setgid directories via NFS. Clear out all that cruft.
1358 if ((iap
->ia_valid
&= ~(ATTR_UID
|ATTR_GID
|ATTR_MODE
)) != 0) {
1359 __be32 err2
= nfsd_setattr(rqstp
, resfhp
, iap
, 0, (time_t)0);
1365 * Update the filehandle to get the new inode info.
1368 err
= fh_update(resfhp
);
1372 if (dchild
&& !IS_ERR(dchild
))
1377 err
= nfserrno(host_err
);
1380 #endif /* CONFIG_NFSD_V3 */
1383 * Read a symlink. On entry, *lenp must contain the maximum path length that
1384 * fits into the buffer. On return, it contains the true length.
1385 * N.B. After this call fhp needs an fh_put
1388 nfsd_readlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, char *buf
, int *lenp
)
1390 struct dentry
*dentry
;
1391 struct inode
*inode
;
1396 err
= fh_verify(rqstp
, fhp
, S_IFLNK
, MAY_NOP
);
1400 dentry
= fhp
->fh_dentry
;
1401 inode
= dentry
->d_inode
;
1404 if (!inode
->i_op
|| !inode
->i_op
->readlink
)
1407 touch_atime(fhp
->fh_export
->ex_mnt
, dentry
);
1408 /* N.B. Why does this call need a get_fs()??
1409 * Remove the set_fs and watch the fireworks:-) --okir
1412 oldfs
= get_fs(); set_fs(KERNEL_DS
);
1413 host_err
= inode
->i_op
->readlink(dentry
, buf
, *lenp
);
1424 err
= nfserrno(host_err
);
1429 * Create a symlink and look up its inode
1430 * N.B. After this call _both_ fhp and resfhp need an fh_put
1433 nfsd_symlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1434 char *fname
, int flen
,
1435 char *path
, int plen
,
1436 struct svc_fh
*resfhp
,
1439 struct dentry
*dentry
, *dnew
;
1448 if (isdotent(fname
, flen
))
1451 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_CREATE
);
1455 dentry
= fhp
->fh_dentry
;
1456 dnew
= lookup_one_len(fname
, dentry
, flen
);
1457 host_err
= PTR_ERR(dnew
);
1462 /* Only the MODE ATTRibute is even vaguely meaningful */
1463 if (iap
&& (iap
->ia_valid
& ATTR_MODE
))
1464 mode
= iap
->ia_mode
& S_IALLUGO
;
1466 if (unlikely(path
[plen
] != 0)) {
1467 char *path_alloced
= kmalloc(plen
+1, GFP_KERNEL
);
1468 if (path_alloced
== NULL
)
1471 strncpy(path_alloced
, path
, plen
);
1472 path_alloced
[plen
] = 0;
1473 host_err
= vfs_symlink(dentry
->d_inode
, dnew
, path_alloced
, mode
);
1474 kfree(path_alloced
);
1477 host_err
= vfs_symlink(dentry
->d_inode
, dnew
, path
, mode
);
1480 if (EX_ISSYNC(fhp
->fh_export
))
1481 host_err
= nfsd_sync_dir(dentry
);
1483 err
= nfserrno(host_err
);
1486 cerr
= fh_compose(resfhp
, fhp
->fh_export
, dnew
, fhp
);
1488 if (err
==0) err
= cerr
;
1493 err
= nfserrno(host_err
);
1499 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1502 nfsd_link(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
,
1503 char *name
, int len
, struct svc_fh
*tfhp
)
1505 struct dentry
*ddir
, *dnew
, *dold
;
1506 struct inode
*dirp
, *dest
;
1510 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, MAY_CREATE
);
1513 err
= fh_verify(rqstp
, tfhp
, -S_IFDIR
, MAY_NOP
);
1521 if (isdotent(name
, len
))
1524 fh_lock_nested(ffhp
, I_MUTEX_PARENT
);
1525 ddir
= ffhp
->fh_dentry
;
1526 dirp
= ddir
->d_inode
;
1528 dnew
= lookup_one_len(name
, ddir
, len
);
1529 host_err
= PTR_ERR(dnew
);
1533 dold
= tfhp
->fh_dentry
;
1534 dest
= dold
->d_inode
;
1536 host_err
= vfs_link(dold
, dirp
, dnew
);
1538 if (EX_ISSYNC(ffhp
->fh_export
)) {
1539 err
= nfserrno(nfsd_sync_dir(ddir
));
1540 write_inode_now(dest
, 1);
1544 if (host_err
== -EXDEV
&& rqstp
->rq_vers
== 2)
1547 err
= nfserrno(host_err
);
1557 err
= nfserrno(host_err
);
1563 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1566 nfsd_rename(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
, char *fname
, int flen
,
1567 struct svc_fh
*tfhp
, char *tname
, int tlen
)
1569 struct dentry
*fdentry
, *tdentry
, *odentry
, *ndentry
, *trap
;
1570 struct inode
*fdir
, *tdir
;
1574 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, MAY_REMOVE
);
1577 err
= fh_verify(rqstp
, tfhp
, S_IFDIR
, MAY_CREATE
);
1581 fdentry
= ffhp
->fh_dentry
;
1582 fdir
= fdentry
->d_inode
;
1584 tdentry
= tfhp
->fh_dentry
;
1585 tdir
= tdentry
->d_inode
;
1587 err
= (rqstp
->rq_vers
== 2) ? nfserr_acces
: nfserr_xdev
;
1588 if (ffhp
->fh_export
!= tfhp
->fh_export
)
1592 if (!flen
|| isdotent(fname
, flen
) || !tlen
|| isdotent(tname
, tlen
))
1595 /* cannot use fh_lock as we need deadlock protective ordering
1596 * so do it by hand */
1597 trap
= lock_rename(tdentry
, fdentry
);
1598 ffhp
->fh_locked
= tfhp
->fh_locked
= 1;
1602 odentry
= lookup_one_len(fname
, fdentry
, flen
);
1603 host_err
= PTR_ERR(odentry
);
1604 if (IS_ERR(odentry
))
1608 if (!odentry
->d_inode
)
1611 if (odentry
== trap
)
1614 ndentry
= lookup_one_len(tname
, tdentry
, tlen
);
1615 host_err
= PTR_ERR(ndentry
);
1616 if (IS_ERR(ndentry
))
1618 host_err
= -ENOTEMPTY
;
1619 if (ndentry
== trap
)
1623 if ((ffhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
1624 ((atomic_read(&odentry
->d_count
) > 1)
1625 || (atomic_read(&ndentry
->d_count
) > 1))) {
1629 host_err
= vfs_rename(fdir
, odentry
, tdir
, ndentry
);
1630 if (!host_err
&& EX_ISSYNC(tfhp
->fh_export
)) {
1631 host_err
= nfsd_sync_dir(tdentry
);
1633 host_err
= nfsd_sync_dir(fdentry
);
1641 err
= nfserrno(host_err
);
1643 /* we cannot reply on fh_unlock on the two filehandles,
1644 * as that would do the wrong thing if the two directories
1645 * were the same, so again we do it by hand
1647 fill_post_wcc(ffhp
);
1648 fill_post_wcc(tfhp
);
1649 unlock_rename(tdentry
, fdentry
);
1650 ffhp
->fh_locked
= tfhp
->fh_locked
= 0;
1657 * Unlink a file or directory
1658 * N.B. After this call fhp needs an fh_put
1661 nfsd_unlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, int type
,
1662 char *fname
, int flen
)
1664 struct dentry
*dentry
, *rdentry
;
1670 if (!flen
|| isdotent(fname
, flen
))
1672 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, MAY_REMOVE
);
1676 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1677 dentry
= fhp
->fh_dentry
;
1678 dirp
= dentry
->d_inode
;
1680 rdentry
= lookup_one_len(fname
, dentry
, flen
);
1681 host_err
= PTR_ERR(rdentry
);
1682 if (IS_ERR(rdentry
))
1685 if (!rdentry
->d_inode
) {
1692 type
= rdentry
->d_inode
->i_mode
& S_IFMT
;
1694 if (type
!= S_IFDIR
) { /* It's UNLINK */
1696 if ((fhp
->fh_export
->ex_flags
& NFSEXP_MSNFS
) &&
1697 (atomic_read(&rdentry
->d_count
) > 1)) {
1701 host_err
= vfs_unlink(dirp
, rdentry
);
1702 } else { /* It's RMDIR */
1703 host_err
= vfs_rmdir(dirp
, rdentry
);
1710 if (EX_ISSYNC(fhp
->fh_export
))
1711 host_err
= nfsd_sync_dir(dentry
);
1714 err
= nfserrno(host_err
);
1720 * Read entries from a directory.
1721 * The NFSv3/4 verifier we ignore for now.
1724 nfsd_readdir(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, loff_t
*offsetp
,
1725 struct readdir_cd
*cdp
, filldir_t func
)
1730 loff_t offset
= *offsetp
;
1732 err
= nfsd_open(rqstp
, fhp
, S_IFDIR
, MAY_READ
, &file
);
1736 offset
= vfs_llseek(file
, offset
, 0);
1738 err
= nfserrno((int)offset
);
1743 * Read the directory entries. This silly loop is necessary because
1744 * readdir() is not guaranteed to fill up the entire buffer, but
1745 * may choose to do less.
1749 cdp
->err
= nfserr_eof
; /* will be cleared on successful read */
1750 host_err
= vfs_readdir(file
, func
, cdp
);
1751 } while (host_err
>=0 && cdp
->err
== nfs_ok
);
1753 err
= nfserrno(host_err
);
1756 *offsetp
= vfs_llseek(file
, 0, 1);
1758 if (err
== nfserr_eof
|| err
== nfserr_toosmall
)
1759 err
= nfs_ok
; /* can still be found in ->err */
1767 * Get file system stats
1768 * N.B. After this call fhp needs an fh_put
1771 nfsd_statfs(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct kstatfs
*stat
)
1773 __be32 err
= fh_verify(rqstp
, fhp
, 0, MAY_NOP
);
1774 if (!err
&& vfs_statfs(fhp
->fh_dentry
,stat
))
1780 * Check for a user's access permissions to this inode.
1783 nfsd_permission(struct svc_export
*exp
, struct dentry
*dentry
, int acc
)
1785 struct inode
*inode
= dentry
->d_inode
;
1791 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
1793 (acc
& MAY_READ
)? " read" : "",
1794 (acc
& MAY_WRITE
)? " write" : "",
1795 (acc
& MAY_EXEC
)? " exec" : "",
1796 (acc
& MAY_SATTR
)? " sattr" : "",
1797 (acc
& MAY_TRUNC
)? " trunc" : "",
1798 (acc
& MAY_LOCK
)? " lock" : "",
1799 (acc
& MAY_OWNER_OVERRIDE
)? " owneroverride" : "",
1801 IS_IMMUTABLE(inode
)? " immut" : "",
1802 IS_APPEND(inode
)? " append" : "",
1803 IS_RDONLY(inode
)? " ro" : "");
1804 dprintk(" owner %d/%d user %d/%d\n",
1805 inode
->i_uid
, inode
->i_gid
, current
->fsuid
, current
->fsgid
);
1808 /* Normally we reject any write/sattr etc access on a read-only file
1809 * system. But if it is IRIX doing check on write-access for a
1810 * device special file, we ignore rofs.
1812 if (!(acc
& MAY_LOCAL_ACCESS
))
1813 if (acc
& (MAY_WRITE
| MAY_SATTR
| MAY_TRUNC
)) {
1814 if (EX_RDONLY(exp
) || IS_RDONLY(inode
))
1816 if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode
))
1819 if ((acc
& MAY_TRUNC
) && IS_APPEND(inode
))
1822 if (acc
& MAY_LOCK
) {
1823 /* If we cannot rely on authentication in NLM requests,
1824 * just allow locks, otherwise require read permission, or
1827 if (exp
->ex_flags
& NFSEXP_NOAUTHNLM
)
1830 acc
= MAY_READ
| MAY_OWNER_OVERRIDE
;
1833 * The file owner always gets access permission for accesses that
1834 * would normally be checked at open time. This is to make
1835 * file access work even when the client has done a fchmod(fd, 0).
1837 * However, `cp foo bar' should fail nevertheless when bar is
1838 * readonly. A sensible way to do this might be to reject all
1839 * attempts to truncate a read-only file, because a creat() call
1840 * always implies file truncation.
1841 * ... but this isn't really fair. A process may reasonably call
1842 * ftruncate on an open file descriptor on a file with perm 000.
1843 * We must trust the client to do permission checking - using "ACCESS"
1846 if ((acc
& MAY_OWNER_OVERRIDE
) &&
1847 inode
->i_uid
== current
->fsuid
)
1850 err
= permission(inode
, acc
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
), NULL
);
1852 /* Allow read access to binaries even when mode 111 */
1853 if (err
== -EACCES
&& S_ISREG(inode
->i_mode
) &&
1854 acc
== (MAY_READ
| MAY_OWNER_OVERRIDE
))
1855 err
= permission(inode
, MAY_EXEC
, NULL
);
1857 return err
? nfserrno(err
) : 0;
1861 nfsd_racache_shutdown(void)
1865 dprintk("nfsd: freeing readahead buffers.\n");
1870 * Initialize readahead param cache
1873 nfsd_racache_init(int cache_size
)
1882 if (cache_size
< 2*RAPARM_HASH_SIZE
)
1883 cache_size
= 2*RAPARM_HASH_SIZE
;
1884 raparml
= kcalloc(cache_size
, sizeof(struct raparms
), GFP_KERNEL
);
1888 "nfsd: Could not allocate memory read-ahead cache.\n");
1892 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size
);
1893 for (i
= 0 ; i
< RAPARM_HASH_SIZE
; i
++) {
1894 raparm_hash
[i
].pb_head
= NULL
;
1895 spin_lock_init(&raparm_hash
[i
].pb_lock
);
1897 nperbucket
= cache_size
>> RAPARM_HASH_BITS
;
1898 for (i
= 0; i
< cache_size
- 1; i
++) {
1899 if (i
% nperbucket
== 0)
1900 raparm_hash
[j
++].pb_head
= raparml
+ i
;
1901 if (i
% nperbucket
< nperbucket
-1)
1902 raparml
[i
].p_next
= raparml
+ i
+ 1;
1905 nfsdstats
.ra_size
= cache_size
;
1909 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
1911 nfsd_get_posix_acl(struct svc_fh
*fhp
, int type
)
1913 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
1917 struct posix_acl
*acl
;
1919 if (!IS_POSIXACL(inode
))
1920 return ERR_PTR(-EOPNOTSUPP
);
1923 case ACL_TYPE_ACCESS
:
1924 name
= POSIX_ACL_XATTR_ACCESS
;
1926 case ACL_TYPE_DEFAULT
:
1927 name
= POSIX_ACL_XATTR_DEFAULT
;
1930 return ERR_PTR(-EOPNOTSUPP
);
1933 size
= nfsd_getxattr(fhp
->fh_dentry
, name
, &value
);
1935 return ERR_PTR(size
);
1937 acl
= posix_acl_from_xattr(value
, size
);
1943 nfsd_set_posix_acl(struct svc_fh
*fhp
, int type
, struct posix_acl
*acl
)
1945 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
1951 if (!IS_POSIXACL(inode
) || !inode
->i_op
||
1952 !inode
->i_op
->setxattr
|| !inode
->i_op
->removexattr
)
1955 case ACL_TYPE_ACCESS
:
1956 name
= POSIX_ACL_XATTR_ACCESS
;
1958 case ACL_TYPE_DEFAULT
:
1959 name
= POSIX_ACL_XATTR_DEFAULT
;
1965 if (acl
&& acl
->a_count
) {
1966 size
= posix_acl_xattr_size(acl
->a_count
);
1967 value
= kmalloc(size
, GFP_KERNEL
);
1970 error
= posix_acl_to_xattr(acl
, value
, size
);
1978 error
= vfs_setxattr(fhp
->fh_dentry
, name
, value
, size
, 0);
1980 if (!S_ISDIR(inode
->i_mode
) && type
== ACL_TYPE_DEFAULT
)
1983 error
= vfs_removexattr(fhp
->fh_dentry
, name
);
1984 if (error
== -ENODATA
)
1993 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */