2 * File operations used by nfsd. Some of these have been ripped from
3 * other parts of the kernel because they weren't exported, others
4 * are partial duplicates with added or changed functionality.
6 * Note that several functions dget() the dentry upon which they want
7 * to act, most notably those that create directory entries. Response
8 * dentry's are dput()'d if necessary in the release callback.
9 * So if you notice code paths that apparently fail to dput() the
10 * dentry, don't worry--they have been taken care of.
12 * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de>
13 * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp>
17 #include <linux/file.h>
18 #include <linux/splice.h>
19 #include <linux/fcntl.h>
20 #include <linux/namei.h>
21 #include <linux/delay.h>
22 #include <linux/fsnotify.h>
23 #include <linux/posix_acl_xattr.h>
24 #include <linux/xattr.h>
25 #include <linux/jhash.h>
26 #include <linux/ima.h>
27 #include <linux/slab.h>
28 #include <asm/uaccess.h>
29 #include <linux/exportfs.h>
30 #include <linux/writeback.h>
34 #endif /* CONFIG_NFSD_V3 */
39 #endif /* CONFIG_NFSD_V4 */
44 #define NFSDDBG_FACILITY NFSDDBG_FILEOP
48 * This is a cache of readahead params that help us choose the proper
49 * readahead strategy. Initially, we set all readahead parameters to 0
50 * and let the VFS handle things.
51 * If you increase the number of cached files very much, you'll need to
52 * add a hash table here.
55 struct raparms
*p_next
;
60 struct file_ra_state p_ra
;
61 unsigned int p_hindex
;
64 struct raparm_hbucket
{
65 struct raparms
*pb_head
;
67 } ____cacheline_aligned_in_smp
;
69 #define RAPARM_HASH_BITS 4
70 #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS)
71 #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1)
72 static struct raparm_hbucket raparm_hash
[RAPARM_HASH_SIZE
];
75 * Called from nfsd_lookup and encode_dirent. Check if we have crossed
77 * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged,
78 * or nfs_ok having possibly changed *dpp and *expp
81 nfsd_cross_mnt(struct svc_rqst
*rqstp
, struct dentry
**dpp
,
82 struct svc_export
**expp
)
84 struct svc_export
*exp
= *expp
, *exp2
= NULL
;
85 struct dentry
*dentry
= *dpp
;
86 struct path path
= {.mnt
= mntget(exp
->ex_path
.mnt
),
87 .dentry
= dget(dentry
)};
90 err
= follow_down(&path
);
94 exp2
= rqst_exp_get_by_name(rqstp
, &path
);
98 * We normally allow NFS clients to continue
99 * "underneath" a mountpoint that is not exported.
100 * The exception is V4ROOT, where no traversal is ever
101 * allowed without an explicit export of the new
104 if (err
== -ENOENT
&& !(exp
->ex_flags
& NFSEXP_V4ROOT
))
109 if (nfsd_v4client(rqstp
) ||
110 (exp
->ex_flags
& NFSEXP_CROSSMOUNT
) || EX_NOHIDE(exp2
)) {
111 /* successfully crossed mount point */
113 * This is subtle: path.dentry is *not* on path.mnt
114 * at this point. The only reason we are safe is that
115 * original mnt is pinned down by exp, so we should
116 * put path *before* putting exp
119 path
.dentry
= dentry
;
129 static void follow_to_parent(struct path
*path
)
133 while (path
->dentry
== path
->mnt
->mnt_root
&& follow_up(path
))
135 dp
= dget_parent(path
->dentry
);
140 static int nfsd_lookup_parent(struct svc_rqst
*rqstp
, struct dentry
*dparent
, struct svc_export
**exp
, struct dentry
**dentryp
)
142 struct svc_export
*exp2
;
143 struct path path
= {.mnt
= mntget((*exp
)->ex_path
.mnt
),
144 .dentry
= dget(dparent
)};
146 follow_to_parent(&path
);
148 exp2
= rqst_exp_parent(rqstp
, &path
);
149 if (PTR_ERR(exp2
) == -ENOENT
) {
150 *dentryp
= dget(dparent
);
151 } else if (IS_ERR(exp2
)) {
153 return PTR_ERR(exp2
);
155 *dentryp
= dget(path
.dentry
);
164 * For nfsd purposes, we treat V4ROOT exports as though there was an
165 * export at *every* directory.
167 int nfsd_mountpoint(struct dentry
*dentry
, struct svc_export
*exp
)
169 if (d_mountpoint(dentry
))
171 if (nfsd4_is_junction(dentry
))
173 if (!(exp
->ex_flags
& NFSEXP_V4ROOT
))
175 return dentry
->d_inode
!= NULL
;
179 nfsd_lookup_dentry(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
180 const char *name
, unsigned int len
,
181 struct svc_export
**exp_ret
, struct dentry
**dentry_ret
)
183 struct svc_export
*exp
;
184 struct dentry
*dparent
;
185 struct dentry
*dentry
;
188 dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp
), len
,name
);
190 dparent
= fhp
->fh_dentry
;
191 exp
= fhp
->fh_export
;
194 /* Lookup the name, but don't follow links */
195 if (isdotent(name
, len
)) {
197 dentry
= dget(dparent
);
198 else if (dparent
!= exp
->ex_path
.dentry
)
199 dentry
= dget_parent(dparent
);
200 else if (!EX_NOHIDE(exp
) && !nfsd_v4client(rqstp
))
201 dentry
= dget(dparent
); /* .. == . just like at / */
203 /* checking mountpoint crossing is very different when stepping up */
204 host_err
= nfsd_lookup_parent(rqstp
, dparent
, &exp
, &dentry
);
210 dentry
= lookup_one_len(name
, dparent
, len
);
211 host_err
= PTR_ERR(dentry
);
215 * check if we have crossed a mount point ...
217 if (nfsd_mountpoint(dentry
, exp
)) {
218 if ((host_err
= nfsd_cross_mnt(rqstp
, &dentry
, &exp
))) {
224 *dentry_ret
= dentry
;
230 return nfserrno(host_err
);
234 * Look up one component of a pathname.
235 * N.B. After this call _both_ fhp and resfh need an fh_put
237 * If the lookup would cross a mountpoint, and the mounted filesystem
238 * is exported to the client with NFSEXP_NOHIDE, then the lookup is
239 * accepted as it stands and the mounted directory is
240 * returned. Otherwise the covered directory is returned.
241 * NOTE: this mountpoint crossing is not supported properly by all
242 * clients and is explicitly disallowed for NFSv3
243 * NeilBrown <neilb@cse.unsw.edu.au>
246 nfsd_lookup(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, const char *name
,
247 unsigned int len
, struct svc_fh
*resfh
)
249 struct svc_export
*exp
;
250 struct dentry
*dentry
;
253 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_EXEC
);
256 err
= nfsd_lookup_dentry(rqstp
, fhp
, name
, len
, &exp
, &dentry
);
259 err
= check_nfsd_access(exp
, rqstp
);
263 * Note: we compose the file handle now, but as the
264 * dentry may be negative, it may need to be updated.
266 err
= fh_compose(resfh
, exp
, dentry
, fhp
);
267 if (!err
&& !dentry
->d_inode
)
275 static int nfsd_break_lease(struct inode
*inode
)
277 if (!S_ISREG(inode
->i_mode
))
279 return break_lease(inode
, O_WRONLY
| O_NONBLOCK
);
283 * Commit metadata changes to stable storage.
286 commit_metadata(struct svc_fh
*fhp
)
288 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
289 const struct export_operations
*export_ops
= inode
->i_sb
->s_export_op
;
291 if (!EX_ISSYNC(fhp
->fh_export
))
294 if (export_ops
->commit_metadata
)
295 return export_ops
->commit_metadata(inode
);
296 return sync_inode_metadata(inode
, 1);
300 * Set various file attributes.
301 * N.B. After this call fhp needs an fh_put
304 nfsd_setattr(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct iattr
*iap
,
305 int check_guard
, time_t guardtime
)
307 struct dentry
*dentry
;
309 int accmode
= NFSD_MAY_SATTR
;
315 if (iap
->ia_valid
& (ATTR_ATIME
| ATTR_MTIME
| ATTR_SIZE
))
316 accmode
|= NFSD_MAY_WRITE
|NFSD_MAY_OWNER_OVERRIDE
;
317 if (iap
->ia_valid
& ATTR_SIZE
)
321 err
= fh_verify(rqstp
, fhp
, ftype
, accmode
);
325 dentry
= fhp
->fh_dentry
;
326 inode
= dentry
->d_inode
;
328 /* Ignore any mode updates on symlinks */
329 if (S_ISLNK(inode
->i_mode
))
330 iap
->ia_valid
&= ~ATTR_MODE
;
336 * NFSv2 does not differentiate between "set-[ac]time-to-now"
337 * which only requires access, and "set-[ac]time-to-X" which
338 * requires ownership.
339 * So if it looks like it might be "set both to the same time which
340 * is close to now", and if inode_change_ok fails, then we
341 * convert to "set to now" instead of "set to explicit time"
343 * We only call inode_change_ok as the last test as technically
344 * it is not an interface that we should be using. It is only
345 * valid if the filesystem does not define it's own i_op->setattr.
347 #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
348 #define MAX_TOUCH_TIME_ERROR (30*60)
349 if ((iap
->ia_valid
& BOTH_TIME_SET
) == BOTH_TIME_SET
&&
350 iap
->ia_mtime
.tv_sec
== iap
->ia_atime
.tv_sec
) {
354 * Now just make sure time is in the right ballpark.
355 * Solaris, at least, doesn't seem to care what the time
356 * request is. We require it be within 30 minutes of now.
358 time_t delta
= iap
->ia_atime
.tv_sec
- get_seconds();
361 if (delta
< MAX_TOUCH_TIME_ERROR
&&
362 inode_change_ok(inode
, iap
) != 0) {
364 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
365 * This will cause notify_change to set these times
368 iap
->ia_valid
&= ~BOTH_TIME_SET
;
373 * The size case is special.
374 * It changes the file as well as the attributes.
376 if (iap
->ia_valid
& ATTR_SIZE
) {
377 if (iap
->ia_size
< inode
->i_size
) {
378 err
= nfsd_permission(rqstp
, fhp
->fh_export
, dentry
,
379 NFSD_MAY_TRUNC
|NFSD_MAY_OWNER_OVERRIDE
);
384 host_err
= get_write_access(inode
);
389 host_err
= locks_verify_truncate(inode
, NULL
, iap
->ia_size
);
391 put_write_access(inode
);
396 /* sanitize the mode change */
397 if (iap
->ia_valid
& ATTR_MODE
) {
398 iap
->ia_mode
&= S_IALLUGO
;
399 iap
->ia_mode
|= (inode
->i_mode
& ~S_IALLUGO
);
402 /* Revoke setuid/setgid on chown */
403 if (!S_ISDIR(inode
->i_mode
) &&
404 (((iap
->ia_valid
& ATTR_UID
) && !uid_eq(iap
->ia_uid
, inode
->i_uid
)) ||
405 ((iap
->ia_valid
& ATTR_GID
) && !gid_eq(iap
->ia_gid
, inode
->i_gid
)))) {
406 iap
->ia_valid
|= ATTR_KILL_PRIV
;
407 if (iap
->ia_valid
& ATTR_MODE
) {
408 /* we're setting mode too, just clear the s*id bits */
409 iap
->ia_mode
&= ~S_ISUID
;
410 if (iap
->ia_mode
& S_IXGRP
)
411 iap
->ia_mode
&= ~S_ISGID
;
413 /* set ATTR_KILL_* bits and let VFS handle it */
414 iap
->ia_valid
|= (ATTR_KILL_SUID
| ATTR_KILL_SGID
);
418 /* Change the attributes. */
420 iap
->ia_valid
|= ATTR_CTIME
;
422 err
= nfserr_notsync
;
423 if (!check_guard
|| guardtime
== inode
->i_ctime
.tv_sec
) {
424 host_err
= nfsd_break_lease(inode
);
429 host_err
= notify_change(dentry
, iap
);
430 err
= nfserrno(host_err
);
434 put_write_access(inode
);
436 commit_metadata(fhp
);
441 err
= nfserrno(host_err
);
445 #if defined(CONFIG_NFSD_V2_ACL) || \
446 defined(CONFIG_NFSD_V3_ACL) || \
447 defined(CONFIG_NFSD_V4)
448 static ssize_t
nfsd_getxattr(struct dentry
*dentry
, char *key
, void **buf
)
453 buflen
= vfs_getxattr(dentry
, key
, NULL
, 0);
457 *buf
= kmalloc(buflen
, GFP_KERNEL
);
461 ret
= vfs_getxattr(dentry
, key
, *buf
, buflen
);
468 #if defined(CONFIG_NFSD_V4)
470 set_nfsv4_acl_one(struct dentry
*dentry
, struct posix_acl
*pacl
, char *key
)
477 buflen
= posix_acl_xattr_size(pacl
->a_count
);
478 buf
= kmalloc(buflen
, GFP_KERNEL
);
483 len
= posix_acl_to_xattr(&init_user_ns
, pacl
, buf
, buflen
);
489 error
= vfs_setxattr(dentry
, key
, buf
, len
, 0);
496 nfsd4_set_nfs4_acl(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
497 struct nfs4_acl
*acl
)
501 struct dentry
*dentry
;
503 struct posix_acl
*pacl
= NULL
, *dpacl
= NULL
;
504 unsigned int flags
= 0;
507 error
= fh_verify(rqstp
, fhp
, 0, NFSD_MAY_SATTR
);
511 dentry
= fhp
->fh_dentry
;
512 inode
= dentry
->d_inode
;
513 if (S_ISDIR(inode
->i_mode
))
514 flags
= NFS4_ACL_DIR
;
516 host_error
= nfs4_acl_nfsv4_to_posix(acl
, &pacl
, &dpacl
, flags
);
517 if (host_error
== -EINVAL
) {
518 return nfserr_attrnotsupp
;
519 } else if (host_error
< 0)
522 host_error
= set_nfsv4_acl_one(dentry
, pacl
, POSIX_ACL_XATTR_ACCESS
);
526 if (S_ISDIR(inode
->i_mode
))
527 host_error
= set_nfsv4_acl_one(dentry
, dpacl
, POSIX_ACL_XATTR_DEFAULT
);
530 posix_acl_release(pacl
);
531 posix_acl_release(dpacl
);
533 if (host_error
== -EOPNOTSUPP
)
534 return nfserr_attrnotsupp
;
536 return nfserrno(host_error
);
539 static struct posix_acl
*
540 _get_posix_acl(struct dentry
*dentry
, char *key
)
543 struct posix_acl
*pacl
= NULL
;
546 buflen
= nfsd_getxattr(dentry
, key
, &buf
);
550 return ERR_PTR(buflen
);
552 pacl
= posix_acl_from_xattr(&init_user_ns
, buf
, buflen
);
558 nfsd4_get_nfs4_acl(struct svc_rqst
*rqstp
, struct dentry
*dentry
, struct nfs4_acl
**acl
)
560 struct inode
*inode
= dentry
->d_inode
;
562 struct posix_acl
*pacl
= NULL
, *dpacl
= NULL
;
563 unsigned int flags
= 0;
565 pacl
= _get_posix_acl(dentry
, POSIX_ACL_XATTR_ACCESS
);
566 if (IS_ERR(pacl
) && PTR_ERR(pacl
) == -ENODATA
)
567 pacl
= posix_acl_from_mode(inode
->i_mode
, GFP_KERNEL
);
569 error
= PTR_ERR(pacl
);
574 if (S_ISDIR(inode
->i_mode
)) {
575 dpacl
= _get_posix_acl(dentry
, POSIX_ACL_XATTR_DEFAULT
);
576 if (IS_ERR(dpacl
) && PTR_ERR(dpacl
) == -ENODATA
)
578 else if (IS_ERR(dpacl
)) {
579 error
= PTR_ERR(dpacl
);
583 flags
= NFS4_ACL_DIR
;
586 *acl
= nfs4_acl_posix_to_nfsv4(pacl
, dpacl
, flags
);
588 error
= PTR_ERR(*acl
);
592 posix_acl_release(pacl
);
593 posix_acl_release(dpacl
);
598 * NFS junction information is stored in an extended attribute.
600 #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs"
603 * nfsd4_is_junction - Test if an object could be an NFS junction
605 * @dentry: object to test
607 * Returns 1 if "dentry" appears to contain NFS junction information.
608 * Otherwise 0 is returned.
610 int nfsd4_is_junction(struct dentry
*dentry
)
612 struct inode
*inode
= dentry
->d_inode
;
616 if (inode
->i_mode
& S_IXUGO
)
618 if (!(inode
->i_mode
& S_ISVTX
))
620 if (vfs_getxattr(dentry
, NFSD_JUNCTION_XATTR_NAME
, NULL
, 0) <= 0)
624 #endif /* defined(CONFIG_NFSD_V4) */
626 #ifdef CONFIG_NFSD_V3
628 * Check server access rights to a file system object
634 static struct accessmap nfs3_regaccess
[] = {
635 { NFS3_ACCESS_READ
, NFSD_MAY_READ
},
636 { NFS3_ACCESS_EXECUTE
, NFSD_MAY_EXEC
},
637 { NFS3_ACCESS_MODIFY
, NFSD_MAY_WRITE
|NFSD_MAY_TRUNC
},
638 { NFS3_ACCESS_EXTEND
, NFSD_MAY_WRITE
},
643 static struct accessmap nfs3_diraccess
[] = {
644 { NFS3_ACCESS_READ
, NFSD_MAY_READ
},
645 { NFS3_ACCESS_LOOKUP
, NFSD_MAY_EXEC
},
646 { NFS3_ACCESS_MODIFY
, NFSD_MAY_EXEC
|NFSD_MAY_WRITE
|NFSD_MAY_TRUNC
},
647 { NFS3_ACCESS_EXTEND
, NFSD_MAY_EXEC
|NFSD_MAY_WRITE
},
648 { NFS3_ACCESS_DELETE
, NFSD_MAY_REMOVE
},
653 static struct accessmap nfs3_anyaccess
[] = {
654 /* Some clients - Solaris 2.6 at least, make an access call
655 * to the server to check for access for things like /dev/null
656 * (which really, the server doesn't care about). So
657 * We provide simple access checking for them, looking
658 * mainly at mode bits, and we make sure to ignore read-only
661 { NFS3_ACCESS_READ
, NFSD_MAY_READ
},
662 { NFS3_ACCESS_EXECUTE
, NFSD_MAY_EXEC
},
663 { NFS3_ACCESS_MODIFY
, NFSD_MAY_WRITE
|NFSD_MAY_LOCAL_ACCESS
},
664 { NFS3_ACCESS_EXTEND
, NFSD_MAY_WRITE
|NFSD_MAY_LOCAL_ACCESS
},
670 nfsd_access(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, u32
*access
, u32
*supported
)
672 struct accessmap
*map
;
673 struct svc_export
*export
;
674 struct dentry
*dentry
;
675 u32 query
, result
= 0, sresult
= 0;
678 error
= fh_verify(rqstp
, fhp
, 0, NFSD_MAY_NOP
);
682 export
= fhp
->fh_export
;
683 dentry
= fhp
->fh_dentry
;
685 if (S_ISREG(dentry
->d_inode
->i_mode
))
686 map
= nfs3_regaccess
;
687 else if (S_ISDIR(dentry
->d_inode
->i_mode
))
688 map
= nfs3_diraccess
;
690 map
= nfs3_anyaccess
;
694 for (; map
->access
; map
++) {
695 if (map
->access
& query
) {
698 sresult
|= map
->access
;
700 err2
= nfsd_permission(rqstp
, export
, dentry
, map
->how
);
703 result
|= map
->access
;
706 /* the following error codes just mean the access was not allowed,
707 * rather than an error occurred */
711 /* simply don't "or" in the access bit. */
721 *supported
= sresult
;
726 #endif /* CONFIG_NFSD_V3 */
728 static int nfsd_open_break_lease(struct inode
*inode
, int access
)
732 if (access
& NFSD_MAY_NOT_BREAK_LEASE
)
734 mode
= (access
& NFSD_MAY_WRITE
) ? O_WRONLY
: O_RDONLY
;
735 return break_lease(inode
, mode
| O_NONBLOCK
);
739 * Open an existing file or directory.
740 * The may_flags argument indicates the type of open (read/write/lock)
741 * and additional flags.
742 * N.B. After this call fhp needs an fh_put
745 nfsd_open(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, umode_t type
,
746 int may_flags
, struct file
**filp
)
750 int flags
= O_RDONLY
|O_LARGEFILE
;
754 validate_process_creds();
757 * If we get here, then the client has already done an "open",
758 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
759 * in case a chmod has now revoked permission.
761 * Arguably we should also allow the owner override for
762 * directories, but we never have and it doesn't seem to have
763 * caused anyone a problem. If we were to change this, note
764 * also that our filldir callbacks would need a variant of
765 * lookup_one_len that doesn't check permissions.
768 may_flags
|= NFSD_MAY_OWNER_OVERRIDE
;
769 err
= fh_verify(rqstp
, fhp
, type
, may_flags
);
773 path
.mnt
= fhp
->fh_export
->ex_path
.mnt
;
774 path
.dentry
= fhp
->fh_dentry
;
775 inode
= path
.dentry
->d_inode
;
777 /* Disallow write access to files with the append-only bit set
778 * or any access when mandatory locking enabled
781 if (IS_APPEND(inode
) && (may_flags
& NFSD_MAY_WRITE
))
784 * We must ignore files (but only files) which might have mandatory
785 * locks on them because there is no way to know if the accesser has
788 if (S_ISREG((inode
)->i_mode
) && mandatory_lock(inode
))
794 host_err
= nfsd_open_break_lease(inode
, may_flags
);
795 if (host_err
) /* NOMEM or WOULDBLOCK */
798 if (may_flags
& NFSD_MAY_WRITE
) {
799 if (may_flags
& NFSD_MAY_READ
)
800 flags
= O_RDWR
|O_LARGEFILE
;
802 flags
= O_WRONLY
|O_LARGEFILE
;
804 *filp
= dentry_open(&path
, flags
, current_cred());
806 host_err
= PTR_ERR(*filp
);
808 host_err
= ima_file_check(*filp
, may_flags
);
810 if (may_flags
& NFSD_MAY_64BIT_COOKIE
)
811 (*filp
)->f_mode
|= FMODE_64BITHASH
;
813 (*filp
)->f_mode
|= FMODE_32BITHASH
;
817 err
= nfserrno(host_err
);
819 validate_process_creds();
827 nfsd_close(struct file
*filp
)
833 * Obtain the readahead parameters for the file
834 * specified by (dev, ino).
837 static inline struct raparms
*
838 nfsd_get_raparms(dev_t dev
, ino_t ino
)
840 struct raparms
*ra
, **rap
, **frap
= NULL
;
843 struct raparm_hbucket
*rab
;
845 hash
= jhash_2words(dev
, ino
, 0xfeedbeef) & RAPARM_HASH_MASK
;
846 rab
= &raparm_hash
[hash
];
848 spin_lock(&rab
->pb_lock
);
849 for (rap
= &rab
->pb_head
; (ra
= *rap
); rap
= &ra
->p_next
) {
850 if (ra
->p_ino
== ino
&& ra
->p_dev
== dev
)
853 if (ra
->p_count
== 0)
856 depth
= nfsdstats
.ra_size
;
858 spin_unlock(&rab
->pb_lock
);
868 if (rap
!= &rab
->pb_head
) {
870 ra
->p_next
= rab
->pb_head
;
874 nfsdstats
.ra_depth
[depth
*10/nfsdstats
.ra_size
]++;
875 spin_unlock(&rab
->pb_lock
);
880 * Grab and keep cached pages associated with a file in the svc_rqst
881 * so that they can be passed to the network sendmsg/sendpage routines
882 * directly. They will be released after the sending has completed.
885 nfsd_splice_actor(struct pipe_inode_info
*pipe
, struct pipe_buffer
*buf
,
886 struct splice_desc
*sd
)
888 struct svc_rqst
*rqstp
= sd
->u
.data
;
889 struct page
**pp
= rqstp
->rq_next_page
;
890 struct page
*page
= buf
->page
;
895 if (rqstp
->rq_res
.page_len
== 0) {
897 put_page(*rqstp
->rq_next_page
);
898 *(rqstp
->rq_next_page
++) = page
;
899 rqstp
->rq_res
.page_base
= buf
->offset
;
900 rqstp
->rq_res
.page_len
= size
;
901 } else if (page
!= pp
[-1]) {
903 if (*rqstp
->rq_next_page
)
904 put_page(*rqstp
->rq_next_page
);
905 *(rqstp
->rq_next_page
++) = page
;
906 rqstp
->rq_res
.page_len
+= size
;
908 rqstp
->rq_res
.page_len
+= size
;
913 static int nfsd_direct_splice_actor(struct pipe_inode_info
*pipe
,
914 struct splice_desc
*sd
)
916 return __splice_from_pipe(pipe
, sd
, nfsd_splice_actor
);
920 nfsd_vfs_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
921 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long *count
)
929 if (file
->f_op
->splice_read
&& rqstp
->rq_splice_ok
) {
930 struct splice_desc sd
= {
937 rqstp
->rq_next_page
= rqstp
->rq_respages
+ 1;
938 host_err
= splice_direct_to_actor(file
, &sd
, nfsd_direct_splice_actor
);
942 host_err
= vfs_readv(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
947 nfsdstats
.io_read
+= host_err
;
950 fsnotify_access(file
);
952 err
= nfserrno(host_err
);
956 static void kill_suid(struct dentry
*dentry
)
959 ia
.ia_valid
= ATTR_KILL_SUID
| ATTR_KILL_SGID
| ATTR_KILL_PRIV
;
961 mutex_lock(&dentry
->d_inode
->i_mutex
);
962 notify_change(dentry
, &ia
);
963 mutex_unlock(&dentry
->d_inode
->i_mutex
);
967 * Gathered writes: If another process is currently writing to the file,
968 * there's a high chance this is another nfsd (triggered by a bulk write
969 * from a client's biod). Rather than syncing the file with each write
970 * request, we sleep for 10 msec.
972 * I don't know if this roughly approximates C. Juszak's idea of
973 * gathered writes, but it's a nice and simple solution (IMHO), and it
976 * Note: we do this only in the NFSv2 case, since v3 and higher have a
977 * better tool (separate unstable writes and commits) for solving this
980 static int wait_for_concurrent_writes(struct file
*file
)
982 struct inode
*inode
= file_inode(file
);
983 static ino_t last_ino
;
984 static dev_t last_dev
;
987 if (atomic_read(&inode
->i_writecount
) > 1
988 || (last_ino
== inode
->i_ino
&& last_dev
== inode
->i_sb
->s_dev
)) {
989 dprintk("nfsd: write defer %d\n", task_pid_nr(current
));
991 dprintk("nfsd: write resume %d\n", task_pid_nr(current
));
994 if (inode
->i_state
& I_DIRTY
) {
995 dprintk("nfsd: write sync %d\n", task_pid_nr(current
));
996 err
= vfs_fsync(file
, 0);
998 last_ino
= inode
->i_ino
;
999 last_dev
= inode
->i_sb
->s_dev
;
1004 nfsd_vfs_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1005 loff_t offset
, struct kvec
*vec
, int vlen
,
1006 unsigned long *cnt
, int *stablep
)
1008 struct svc_export
*exp
;
1009 struct dentry
*dentry
;
1010 struct inode
*inode
;
1014 int stable
= *stablep
;
1017 dentry
= file
->f_path
.dentry
;
1018 inode
= dentry
->d_inode
;
1019 exp
= fhp
->fh_export
;
1021 use_wgather
= (rqstp
->rq_vers
== 2) && EX_WGATHER(exp
);
1023 if (!EX_ISSYNC(exp
))
1026 /* Write the data. */
1027 oldfs
= get_fs(); set_fs(KERNEL_DS
);
1028 host_err
= vfs_writev(file
, (struct iovec __user
*)vec
, vlen
, &offset
);
1033 nfsdstats
.io_write
+= host_err
;
1034 fsnotify_modify(file
);
1036 /* clear setuid/setgid flag after write */
1037 if (inode
->i_mode
& (S_ISUID
| S_ISGID
))
1042 host_err
= wait_for_concurrent_writes(file
);
1044 host_err
= vfs_fsync_range(file
, offset
, offset
+*cnt
, 0);
1048 dprintk("nfsd: write complete host_err=%d\n", host_err
);
1052 err
= nfserrno(host_err
);
1057 * Read data from a file. count must contain the requested read count
1058 * on entry. On return, *count contains the number of bytes actually read.
1059 * N.B. After this call fhp needs an fh_put
1061 __be32
nfsd_read(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1062 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long *count
)
1065 struct inode
*inode
;
1069 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, NFSD_MAY_READ
, &file
);
1073 inode
= file_inode(file
);
1075 /* Get readahead parameters */
1076 ra
= nfsd_get_raparms(inode
->i_sb
->s_dev
, inode
->i_ino
);
1078 if (ra
&& ra
->p_set
)
1079 file
->f_ra
= ra
->p_ra
;
1081 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
1083 /* Write back readahead params */
1085 struct raparm_hbucket
*rab
= &raparm_hash
[ra
->p_hindex
];
1086 spin_lock(&rab
->pb_lock
);
1087 ra
->p_ra
= file
->f_ra
;
1090 spin_unlock(&rab
->pb_lock
);
1097 /* As above, but use the provided file descriptor. */
1099 nfsd_read_file(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1100 loff_t offset
, struct kvec
*vec
, int vlen
,
1101 unsigned long *count
)
1106 err
= nfsd_permission(rqstp
, fhp
->fh_export
, fhp
->fh_dentry
,
1107 NFSD_MAY_READ
|NFSD_MAY_OWNER_OVERRIDE
);
1110 err
= nfsd_vfs_read(rqstp
, fhp
, file
, offset
, vec
, vlen
, count
);
1111 } else /* Note file may still be NULL in NFSv4 special stateid case: */
1112 err
= nfsd_read(rqstp
, fhp
, offset
, vec
, vlen
, count
);
1118 * Write data to a file.
1119 * The stable flag requests synchronous writes.
1120 * N.B. After this call fhp needs an fh_put
1123 nfsd_write(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file
*file
,
1124 loff_t offset
, struct kvec
*vec
, int vlen
, unsigned long *cnt
,
1130 err
= nfsd_permission(rqstp
, fhp
->fh_export
, fhp
->fh_dentry
,
1131 NFSD_MAY_WRITE
|NFSD_MAY_OWNER_OVERRIDE
);
1134 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
, cnt
,
1137 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, NFSD_MAY_WRITE
, &file
);
1142 err
= nfsd_vfs_write(rqstp
, fhp
, file
, offset
, vec
, vlen
,
1150 #ifdef CONFIG_NFSD_V3
1152 * Commit all pending writes to stable storage.
1154 * Note: we only guarantee that data that lies within the range specified
1155 * by the 'offset' and 'count' parameters will be synced.
1157 * Unfortunately we cannot lock the file to make sure we return full WCC
1158 * data to the client, as locking happens lower down in the filesystem.
1161 nfsd_commit(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1162 loff_t offset
, unsigned long count
)
1165 loff_t end
= LLONG_MAX
;
1166 __be32 err
= nfserr_inval
;
1171 end
= offset
+ (loff_t
)count
- 1;
1176 err
= nfsd_open(rqstp
, fhp
, S_IFREG
,
1177 NFSD_MAY_WRITE
|NFSD_MAY_NOT_BREAK_LEASE
, &file
);
1180 if (EX_ISSYNC(fhp
->fh_export
)) {
1181 int err2
= vfs_fsync_range(file
, offset
, end
, 0);
1183 if (err2
!= -EINVAL
)
1184 err
= nfserrno(err2
);
1186 err
= nfserr_notsupp
;
1193 #endif /* CONFIG_NFSD_V3 */
1196 nfsd_create_setattr(struct svc_rqst
*rqstp
, struct svc_fh
*resfhp
,
1200 * Mode has already been set earlier in create:
1202 iap
->ia_valid
&= ~ATTR_MODE
;
1204 * Setting uid/gid works only for root. Irix appears to
1205 * send along the gid on create when it tries to implement
1206 * setgid directories via NFS:
1208 if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID
))
1209 iap
->ia_valid
&= ~(ATTR_UID
|ATTR_GID
);
1211 return nfsd_setattr(rqstp
, resfhp
, iap
, 0, (time_t)0);
1215 /* HPUX client sometimes creates a file in mode 000, and sets size to 0.
1216 * setting size to 0 may fail for some specific file systems by the permission
1217 * checking which requires WRITE permission but the mode is 000.
1218 * we ignore the resizing(to 0) on the just new created file, since the size is
1219 * 0 after file created.
1221 * call this only after vfs_create() is called.
1224 nfsd_check_ignore_resizing(struct iattr
*iap
)
1226 if ((iap
->ia_valid
& ATTR_SIZE
) && (iap
->ia_size
== 0))
1227 iap
->ia_valid
&= ~ATTR_SIZE
;
1231 * Create a file (regular, directory, device, fifo); UNIX sockets
1232 * not yet implemented.
1233 * If the response fh has been verified, the parent directory should
1234 * already be locked. Note that the parent directory is left locked.
1236 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
1239 nfsd_create(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1240 char *fname
, int flen
, struct iattr
*iap
,
1241 int type
, dev_t rdev
, struct svc_fh
*resfhp
)
1243 struct dentry
*dentry
, *dchild
= NULL
;
1253 if (isdotent(fname
, flen
))
1256 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_CREATE
);
1260 dentry
= fhp
->fh_dentry
;
1261 dirp
= dentry
->d_inode
;
1263 err
= nfserr_notdir
;
1264 if (!dirp
->i_op
->lookup
)
1267 * Check whether the response file handle has been verified yet.
1268 * If it has, the parent directory should already be locked.
1270 if (!resfhp
->fh_dentry
) {
1271 host_err
= fh_want_write(fhp
);
1275 /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
1276 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1277 dchild
= lookup_one_len(fname
, dentry
, flen
);
1278 host_err
= PTR_ERR(dchild
);
1281 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1285 /* called from nfsd_proc_create */
1286 dchild
= dget(resfhp
->fh_dentry
);
1287 if (!fhp
->fh_locked
) {
1288 /* not actually possible */
1290 "nfsd_create: parent %s/%s not locked!\n",
1291 dentry
->d_parent
->d_name
.name
,
1292 dentry
->d_name
.name
);
1298 * Make sure the child dentry is still negative ...
1301 if (dchild
->d_inode
) {
1302 dprintk("nfsd_create: dentry %s/%s not negative!\n",
1303 dentry
->d_name
.name
, dchild
->d_name
.name
);
1307 if (!(iap
->ia_valid
& ATTR_MODE
))
1309 iap
->ia_mode
= (iap
->ia_mode
& S_IALLUGO
) | type
;
1312 if (!S_ISREG(type
) && !S_ISDIR(type
) && !special_file(type
)) {
1313 printk(KERN_WARNING
"nfsd: bad file type %o in nfsd_create\n",
1319 * Get the dir op function pointer.
1325 host_err
= vfs_create(dirp
, dchild
, iap
->ia_mode
, true);
1327 nfsd_check_ignore_resizing(iap
);
1330 host_err
= vfs_mkdir(dirp
, dchild
, iap
->ia_mode
);
1336 host_err
= vfs_mknod(dirp
, dchild
, iap
->ia_mode
, rdev
);
1342 err
= nfsd_create_setattr(rqstp
, resfhp
, iap
);
1345 * nfsd_setattr already committed the child. Transactional filesystems
1346 * had a chance to commit changes for both parent and child
1347 * simultaneously making the following commit_metadata a noop.
1349 err2
= nfserrno(commit_metadata(fhp
));
1353 * Update the file handle to get the new inode info.
1356 err
= fh_update(resfhp
);
1358 if (dchild
&& !IS_ERR(dchild
))
1363 err
= nfserrno(host_err
);
1367 #ifdef CONFIG_NFSD_V3
1369 static inline int nfsd_create_is_exclusive(int createmode
)
1371 return createmode
== NFS3_CREATE_EXCLUSIVE
1372 || createmode
== NFS4_CREATE_EXCLUSIVE4_1
;
1376 * NFSv3 and NFSv4 version of nfsd_create
1379 do_nfsd_create(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1380 char *fname
, int flen
, struct iattr
*iap
,
1381 struct svc_fh
*resfhp
, int createmode
, u32
*verifier
,
1382 bool *truncp
, bool *created
)
1384 struct dentry
*dentry
, *dchild
= NULL
;
1388 __u32 v_mtime
=0, v_atime
=0;
1394 if (isdotent(fname
, flen
))
1396 if (!(iap
->ia_valid
& ATTR_MODE
))
1398 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_EXEC
);
1402 dentry
= fhp
->fh_dentry
;
1403 dirp
= dentry
->d_inode
;
1405 /* Get all the sanity checks out of the way before
1406 * we lock the parent. */
1407 err
= nfserr_notdir
;
1408 if (!dirp
->i_op
->lookup
)
1411 host_err
= fh_want_write(fhp
);
1415 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1418 * Compose the response file handle.
1420 dchild
= lookup_one_len(fname
, dentry
, flen
);
1421 host_err
= PTR_ERR(dchild
);
1425 /* If file doesn't exist, check for permissions to create one */
1426 if (!dchild
->d_inode
) {
1427 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_CREATE
);
1432 err
= fh_compose(resfhp
, fhp
->fh_export
, dchild
, fhp
);
1436 if (nfsd_create_is_exclusive(createmode
)) {
1437 /* solaris7 gets confused (bugid 4218508) if these have
1438 * the high bit set, so just clear the high bits. If this is
1439 * ever changed to use different attrs for storing the
1440 * verifier, then do_open_lookup() will also need to be fixed
1443 v_mtime
= verifier
[0]&0x7fffffff;
1444 v_atime
= verifier
[1]&0x7fffffff;
1447 if (dchild
->d_inode
) {
1450 switch (createmode
) {
1451 case NFS3_CREATE_UNCHECKED
:
1452 if (! S_ISREG(dchild
->d_inode
->i_mode
))
1455 /* in nfsv4, we need to treat this case a little
1456 * differently. we don't want to truncate the
1457 * file now; this would be wrong if the OPEN
1458 * fails for some other reason. furthermore,
1459 * if the size is nonzero, we should ignore it
1460 * according to spec!
1462 *truncp
= (iap
->ia_valid
& ATTR_SIZE
) && !iap
->ia_size
;
1465 iap
->ia_valid
&= ATTR_SIZE
;
1469 case NFS3_CREATE_EXCLUSIVE
:
1470 if ( dchild
->d_inode
->i_mtime
.tv_sec
== v_mtime
1471 && dchild
->d_inode
->i_atime
.tv_sec
== v_atime
1472 && dchild
->d_inode
->i_size
== 0 ) {
1477 case NFS4_CREATE_EXCLUSIVE4_1
:
1478 if ( dchild
->d_inode
->i_mtime
.tv_sec
== v_mtime
1479 && dchild
->d_inode
->i_atime
.tv_sec
== v_atime
1480 && dchild
->d_inode
->i_size
== 0 ) {
1486 case NFS3_CREATE_GUARDED
:
1493 host_err
= vfs_create(dirp
, dchild
, iap
->ia_mode
, true);
1501 nfsd_check_ignore_resizing(iap
);
1503 if (nfsd_create_is_exclusive(createmode
)) {
1504 /* Cram the verifier into atime/mtime */
1505 iap
->ia_valid
= ATTR_MTIME
|ATTR_ATIME
1506 | ATTR_MTIME_SET
|ATTR_ATIME_SET
;
1507 /* XXX someone who knows this better please fix it for nsec */
1508 iap
->ia_mtime
.tv_sec
= v_mtime
;
1509 iap
->ia_atime
.tv_sec
= v_atime
;
1510 iap
->ia_mtime
.tv_nsec
= 0;
1511 iap
->ia_atime
.tv_nsec
= 0;
1515 err
= nfsd_create_setattr(rqstp
, resfhp
, iap
);
1518 * nfsd_setattr already committed the child (and possibly also the parent).
1521 err
= nfserrno(commit_metadata(fhp
));
1524 * Update the filehandle to get the new inode info.
1527 err
= fh_update(resfhp
);
1531 if (dchild
&& !IS_ERR(dchild
))
1537 err
= nfserrno(host_err
);
1540 #endif /* CONFIG_NFSD_V3 */
1543 * Read a symlink. On entry, *lenp must contain the maximum path length that
1544 * fits into the buffer. On return, it contains the true length.
1545 * N.B. After this call fhp needs an fh_put
1548 nfsd_readlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, char *buf
, int *lenp
)
1550 struct inode
*inode
;
1556 err
= fh_verify(rqstp
, fhp
, S_IFLNK
, NFSD_MAY_NOP
);
1560 path
.mnt
= fhp
->fh_export
->ex_path
.mnt
;
1561 path
.dentry
= fhp
->fh_dentry
;
1562 inode
= path
.dentry
->d_inode
;
1565 if (!inode
->i_op
->readlink
)
1569 /* N.B. Why does this call need a get_fs()??
1570 * Remove the set_fs and watch the fireworks:-) --okir
1573 oldfs
= get_fs(); set_fs(KERNEL_DS
);
1574 host_err
= inode
->i_op
->readlink(path
.dentry
, (char __user
*)buf
, *lenp
);
1585 err
= nfserrno(host_err
);
1590 * Create a symlink and look up its inode
1591 * N.B. After this call _both_ fhp and resfhp need an fh_put
1594 nfsd_symlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
,
1595 char *fname
, int flen
,
1596 char *path
, int plen
,
1597 struct svc_fh
*resfhp
,
1600 struct dentry
*dentry
, *dnew
;
1608 if (isdotent(fname
, flen
))
1611 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_CREATE
);
1615 host_err
= fh_want_write(fhp
);
1620 dentry
= fhp
->fh_dentry
;
1621 dnew
= lookup_one_len(fname
, dentry
, flen
);
1622 host_err
= PTR_ERR(dnew
);
1626 if (unlikely(path
[plen
] != 0)) {
1627 char *path_alloced
= kmalloc(plen
+1, GFP_KERNEL
);
1628 if (path_alloced
== NULL
)
1631 strncpy(path_alloced
, path
, plen
);
1632 path_alloced
[plen
] = 0;
1633 host_err
= vfs_symlink(dentry
->d_inode
, dnew
, path_alloced
);
1634 kfree(path_alloced
);
1637 host_err
= vfs_symlink(dentry
->d_inode
, dnew
, path
);
1638 err
= nfserrno(host_err
);
1640 err
= nfserrno(commit_metadata(fhp
));
1645 cerr
= fh_compose(resfhp
, fhp
->fh_export
, dnew
, fhp
);
1647 if (err
==0) err
= cerr
;
1652 err
= nfserrno(host_err
);
1658 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1661 nfsd_link(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
,
1662 char *name
, int len
, struct svc_fh
*tfhp
)
1664 struct dentry
*ddir
, *dnew
, *dold
;
1669 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, NFSD_MAY_CREATE
);
1672 err
= fh_verify(rqstp
, tfhp
, 0, NFSD_MAY_NOP
);
1676 if (S_ISDIR(tfhp
->fh_dentry
->d_inode
->i_mode
))
1682 if (isdotent(name
, len
))
1685 host_err
= fh_want_write(tfhp
);
1687 err
= nfserrno(host_err
);
1691 fh_lock_nested(ffhp
, I_MUTEX_PARENT
);
1692 ddir
= ffhp
->fh_dentry
;
1693 dirp
= ddir
->d_inode
;
1695 dnew
= lookup_one_len(name
, ddir
, len
);
1696 host_err
= PTR_ERR(dnew
);
1700 dold
= tfhp
->fh_dentry
;
1705 host_err
= nfsd_break_lease(dold
->d_inode
);
1707 err
= nfserrno(host_err
);
1710 host_err
= vfs_link(dold
, dirp
, dnew
);
1712 err
= nfserrno(commit_metadata(ffhp
));
1714 err
= nfserrno(commit_metadata(tfhp
));
1716 if (host_err
== -EXDEV
&& rqstp
->rq_vers
== 2)
1719 err
= nfserrno(host_err
);
1725 fh_drop_write(tfhp
);
1730 err
= nfserrno(host_err
);
1736 * N.B. After this call _both_ ffhp and tfhp need an fh_put
1739 nfsd_rename(struct svc_rqst
*rqstp
, struct svc_fh
*ffhp
, char *fname
, int flen
,
1740 struct svc_fh
*tfhp
, char *tname
, int tlen
)
1742 struct dentry
*fdentry
, *tdentry
, *odentry
, *ndentry
, *trap
;
1743 struct inode
*fdir
, *tdir
;
1747 err
= fh_verify(rqstp
, ffhp
, S_IFDIR
, NFSD_MAY_REMOVE
);
1750 err
= fh_verify(rqstp
, tfhp
, S_IFDIR
, NFSD_MAY_CREATE
);
1754 fdentry
= ffhp
->fh_dentry
;
1755 fdir
= fdentry
->d_inode
;
1757 tdentry
= tfhp
->fh_dentry
;
1758 tdir
= tdentry
->d_inode
;
1760 err
= (rqstp
->rq_vers
== 2) ? nfserr_acces
: nfserr_xdev
;
1761 if (ffhp
->fh_export
!= tfhp
->fh_export
)
1765 if (!flen
|| isdotent(fname
, flen
) || !tlen
|| isdotent(tname
, tlen
))
1768 host_err
= fh_want_write(ffhp
);
1770 err
= nfserrno(host_err
);
1774 /* cannot use fh_lock as we need deadlock protective ordering
1775 * so do it by hand */
1776 trap
= lock_rename(tdentry
, fdentry
);
1777 ffhp
->fh_locked
= tfhp
->fh_locked
= 1;
1781 odentry
= lookup_one_len(fname
, fdentry
, flen
);
1782 host_err
= PTR_ERR(odentry
);
1783 if (IS_ERR(odentry
))
1787 if (!odentry
->d_inode
)
1790 if (odentry
== trap
)
1793 ndentry
= lookup_one_len(tname
, tdentry
, tlen
);
1794 host_err
= PTR_ERR(ndentry
);
1795 if (IS_ERR(ndentry
))
1797 host_err
= -ENOTEMPTY
;
1798 if (ndentry
== trap
)
1802 if (ffhp
->fh_export
->ex_path
.mnt
!= tfhp
->fh_export
->ex_path
.mnt
)
1805 host_err
= nfsd_break_lease(odentry
->d_inode
);
1808 if (ndentry
->d_inode
) {
1809 host_err
= nfsd_break_lease(ndentry
->d_inode
);
1813 host_err
= vfs_rename(fdir
, odentry
, tdir
, ndentry
);
1815 host_err
= commit_metadata(tfhp
);
1817 host_err
= commit_metadata(ffhp
);
1824 err
= nfserrno(host_err
);
1826 /* we cannot reply on fh_unlock on the two filehandles,
1827 * as that would do the wrong thing if the two directories
1828 * were the same, so again we do it by hand
1830 fill_post_wcc(ffhp
);
1831 fill_post_wcc(tfhp
);
1832 unlock_rename(tdentry
, fdentry
);
1833 ffhp
->fh_locked
= tfhp
->fh_locked
= 0;
1834 fh_drop_write(ffhp
);
1841 * Unlink a file or directory
1842 * N.B. After this call fhp needs an fh_put
1845 nfsd_unlink(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, int type
,
1846 char *fname
, int flen
)
1848 struct dentry
*dentry
, *rdentry
;
1854 if (!flen
|| isdotent(fname
, flen
))
1856 err
= fh_verify(rqstp
, fhp
, S_IFDIR
, NFSD_MAY_REMOVE
);
1860 host_err
= fh_want_write(fhp
);
1864 fh_lock_nested(fhp
, I_MUTEX_PARENT
);
1865 dentry
= fhp
->fh_dentry
;
1866 dirp
= dentry
->d_inode
;
1868 rdentry
= lookup_one_len(fname
, dentry
, flen
);
1869 host_err
= PTR_ERR(rdentry
);
1870 if (IS_ERR(rdentry
))
1873 if (!rdentry
->d_inode
) {
1880 type
= rdentry
->d_inode
->i_mode
& S_IFMT
;
1882 host_err
= nfsd_break_lease(rdentry
->d_inode
);
1885 if (type
!= S_IFDIR
)
1886 host_err
= vfs_unlink(dirp
, rdentry
);
1888 host_err
= vfs_rmdir(dirp
, rdentry
);
1890 host_err
= commit_metadata(fhp
);
1895 err
= nfserrno(host_err
);
1901 * We do this buffering because we must not call back into the file
1902 * system's ->lookup() method from the filldir callback. That may well
1903 * deadlock a number of file systems.
1905 * This is based heavily on the implementation of same in XFS.
1907 struct buffered_dirent
{
1911 unsigned int d_type
;
1915 struct readdir_data
{
1921 static int nfsd_buffered_filldir(void *__buf
, const char *name
, int namlen
,
1922 loff_t offset
, u64 ino
, unsigned int d_type
)
1924 struct readdir_data
*buf
= __buf
;
1925 struct buffered_dirent
*de
= (void *)(buf
->dirent
+ buf
->used
);
1926 unsigned int reclen
;
1928 reclen
= ALIGN(sizeof(struct buffered_dirent
) + namlen
, sizeof(u64
));
1929 if (buf
->used
+ reclen
> PAGE_SIZE
) {
1934 de
->namlen
= namlen
;
1935 de
->offset
= offset
;
1937 de
->d_type
= d_type
;
1938 memcpy(de
->name
, name
, namlen
);
1939 buf
->used
+= reclen
;
1944 static __be32
nfsd_buffered_readdir(struct file
*file
, filldir_t func
,
1945 struct readdir_cd
*cdp
, loff_t
*offsetp
)
1947 struct readdir_data buf
;
1948 struct buffered_dirent
*de
;
1953 buf
.dirent
= (void *)__get_free_page(GFP_KERNEL
);
1955 return nfserrno(-ENOMEM
);
1960 struct inode
*dir_inode
= file_inode(file
);
1961 unsigned int reclen
;
1963 cdp
->err
= nfserr_eof
; /* will be cleared on successful read */
1967 host_err
= vfs_readdir(file
, nfsd_buffered_filldir
, &buf
);
1980 * Various filldir functions may end up calling back into
1981 * lookup_one_len() and the file system's ->lookup() method.
1982 * These expect i_mutex to be held, as it would within readdir.
1984 host_err
= mutex_lock_killable(&dir_inode
->i_mutex
);
1988 de
= (struct buffered_dirent
*)buf
.dirent
;
1990 offset
= de
->offset
;
1992 if (func(cdp
, de
->name
, de
->namlen
, de
->offset
,
1993 de
->ino
, de
->d_type
))
1996 if (cdp
->err
!= nfs_ok
)
1999 reclen
= ALIGN(sizeof(*de
) + de
->namlen
,
2002 de
= (struct buffered_dirent
*)((char *)de
+ reclen
);
2004 mutex_unlock(&dir_inode
->i_mutex
);
2005 if (size
> 0) /* We bailed out early */
2008 offset
= vfs_llseek(file
, 0, SEEK_CUR
);
2011 free_page((unsigned long)(buf
.dirent
));
2014 return nfserrno(host_err
);
2021 * Read entries from a directory.
2022 * The NFSv3/4 verifier we ignore for now.
2025 nfsd_readdir(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, loff_t
*offsetp
,
2026 struct readdir_cd
*cdp
, filldir_t func
)
2030 loff_t offset
= *offsetp
;
2031 int may_flags
= NFSD_MAY_READ
;
2033 /* NFSv2 only supports 32 bit cookies */
2034 if (rqstp
->rq_vers
> 2)
2035 may_flags
|= NFSD_MAY_64BIT_COOKIE
;
2037 err
= nfsd_open(rqstp
, fhp
, S_IFDIR
, may_flags
, &file
);
2041 offset
= vfs_llseek(file
, offset
, SEEK_SET
);
2043 err
= nfserrno((int)offset
);
2047 err
= nfsd_buffered_readdir(file
, func
, cdp
, offsetp
);
2049 if (err
== nfserr_eof
|| err
== nfserr_toosmall
)
2050 err
= nfs_ok
; /* can still be found in ->err */
2058 * Get file system stats
2059 * N.B. After this call fhp needs an fh_put
2062 nfsd_statfs(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct kstatfs
*stat
, int access
)
2066 err
= fh_verify(rqstp
, fhp
, 0, NFSD_MAY_NOP
| access
);
2068 struct path path
= {
2069 .mnt
= fhp
->fh_export
->ex_path
.mnt
,
2070 .dentry
= fhp
->fh_dentry
,
2072 if (vfs_statfs(&path
, stat
))
2078 static int exp_rdonly(struct svc_rqst
*rqstp
, struct svc_export
*exp
)
2080 return nfsexp_flags(rqstp
, exp
) & NFSEXP_READONLY
;
2084 * Check for a user's access permissions to this inode.
2087 nfsd_permission(struct svc_rqst
*rqstp
, struct svc_export
*exp
,
2088 struct dentry
*dentry
, int acc
)
2090 struct inode
*inode
= dentry
->d_inode
;
2093 if ((acc
& NFSD_MAY_MASK
) == NFSD_MAY_NOP
)
2096 dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
2098 (acc
& NFSD_MAY_READ
)? " read" : "",
2099 (acc
& NFSD_MAY_WRITE
)? " write" : "",
2100 (acc
& NFSD_MAY_EXEC
)? " exec" : "",
2101 (acc
& NFSD_MAY_SATTR
)? " sattr" : "",
2102 (acc
& NFSD_MAY_TRUNC
)? " trunc" : "",
2103 (acc
& NFSD_MAY_LOCK
)? " lock" : "",
2104 (acc
& NFSD_MAY_OWNER_OVERRIDE
)? " owneroverride" : "",
2106 IS_IMMUTABLE(inode
)? " immut" : "",
2107 IS_APPEND(inode
)? " append" : "",
2108 __mnt_is_readonly(exp
->ex_path
.mnt
)? " ro" : "");
2109 dprintk(" owner %d/%d user %d/%d\n",
2110 inode
->i_uid
, inode
->i_gid
, current_fsuid(), current_fsgid());
2113 /* Normally we reject any write/sattr etc access on a read-only file
2114 * system. But if it is IRIX doing check on write-access for a
2115 * device special file, we ignore rofs.
2117 if (!(acc
& NFSD_MAY_LOCAL_ACCESS
))
2118 if (acc
& (NFSD_MAY_WRITE
| NFSD_MAY_SATTR
| NFSD_MAY_TRUNC
)) {
2119 if (exp_rdonly(rqstp
, exp
) ||
2120 __mnt_is_readonly(exp
->ex_path
.mnt
))
2122 if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode
))
2125 if ((acc
& NFSD_MAY_TRUNC
) && IS_APPEND(inode
))
2128 if (acc
& NFSD_MAY_LOCK
) {
2129 /* If we cannot rely on authentication in NLM requests,
2130 * just allow locks, otherwise require read permission, or
2133 if (exp
->ex_flags
& NFSEXP_NOAUTHNLM
)
2136 acc
= NFSD_MAY_READ
| NFSD_MAY_OWNER_OVERRIDE
;
2139 * The file owner always gets access permission for accesses that
2140 * would normally be checked at open time. This is to make
2141 * file access work even when the client has done a fchmod(fd, 0).
2143 * However, `cp foo bar' should fail nevertheless when bar is
2144 * readonly. A sensible way to do this might be to reject all
2145 * attempts to truncate a read-only file, because a creat() call
2146 * always implies file truncation.
2147 * ... but this isn't really fair. A process may reasonably call
2148 * ftruncate on an open file descriptor on a file with perm 000.
2149 * We must trust the client to do permission checking - using "ACCESS"
2152 if ((acc
& NFSD_MAY_OWNER_OVERRIDE
) &&
2153 uid_eq(inode
->i_uid
, current_fsuid()))
2156 /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */
2157 err
= inode_permission(inode
, acc
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
));
2159 /* Allow read access to binaries even when mode 111 */
2160 if (err
== -EACCES
&& S_ISREG(inode
->i_mode
) &&
2161 (acc
== (NFSD_MAY_READ
| NFSD_MAY_OWNER_OVERRIDE
) ||
2162 acc
== (NFSD_MAY_READ
| NFSD_MAY_READ_IF_EXEC
)))
2163 err
= inode_permission(inode
, MAY_EXEC
);
2165 return err
? nfserrno(err
) : 0;
2169 nfsd_racache_shutdown(void)
2171 struct raparms
*raparm
, *last_raparm
;
2174 dprintk("nfsd: freeing readahead buffers.\n");
2176 for (i
= 0; i
< RAPARM_HASH_SIZE
; i
++) {
2177 raparm
= raparm_hash
[i
].pb_head
;
2179 last_raparm
= raparm
;
2180 raparm
= raparm
->p_next
;
2183 raparm_hash
[i
].pb_head
= NULL
;
2187 * Initialize readahead param cache
2190 nfsd_racache_init(int cache_size
)
2195 struct raparms
**raparm
= NULL
;
2198 if (raparm_hash
[0].pb_head
)
2200 nperbucket
= DIV_ROUND_UP(cache_size
, RAPARM_HASH_SIZE
);
2203 cache_size
= nperbucket
* RAPARM_HASH_SIZE
;
2205 dprintk("nfsd: allocating %d readahead buffers.\n", cache_size
);
2207 for (i
= 0; i
< RAPARM_HASH_SIZE
; i
++) {
2208 spin_lock_init(&raparm_hash
[i
].pb_lock
);
2210 raparm
= &raparm_hash
[i
].pb_head
;
2211 for (j
= 0; j
< nperbucket
; j
++) {
2212 *raparm
= kzalloc(sizeof(struct raparms
), GFP_KERNEL
);
2215 raparm
= &(*raparm
)->p_next
;
2220 nfsdstats
.ra_size
= cache_size
;
2224 dprintk("nfsd: kmalloc failed, freeing readahead buffers\n");
2225 nfsd_racache_shutdown();
2229 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
2231 nfsd_get_posix_acl(struct svc_fh
*fhp
, int type
)
2233 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
2237 struct posix_acl
*acl
;
2239 if (!IS_POSIXACL(inode
))
2240 return ERR_PTR(-EOPNOTSUPP
);
2243 case ACL_TYPE_ACCESS
:
2244 name
= POSIX_ACL_XATTR_ACCESS
;
2246 case ACL_TYPE_DEFAULT
:
2247 name
= POSIX_ACL_XATTR_DEFAULT
;
2250 return ERR_PTR(-EOPNOTSUPP
);
2253 size
= nfsd_getxattr(fhp
->fh_dentry
, name
, &value
);
2255 return ERR_PTR(size
);
2257 acl
= posix_acl_from_xattr(&init_user_ns
, value
, size
);
2263 nfsd_set_posix_acl(struct svc_fh
*fhp
, int type
, struct posix_acl
*acl
)
2265 struct inode
*inode
= fhp
->fh_dentry
->d_inode
;
2271 if (!IS_POSIXACL(inode
) ||
2272 !inode
->i_op
->setxattr
|| !inode
->i_op
->removexattr
)
2275 case ACL_TYPE_ACCESS
:
2276 name
= POSIX_ACL_XATTR_ACCESS
;
2278 case ACL_TYPE_DEFAULT
:
2279 name
= POSIX_ACL_XATTR_DEFAULT
;
2285 if (acl
&& acl
->a_count
) {
2286 size
= posix_acl_xattr_size(acl
->a_count
);
2287 value
= kmalloc(size
, GFP_KERNEL
);
2290 error
= posix_acl_to_xattr(&init_user_ns
, acl
, value
, size
);
2297 error
= fh_want_write(fhp
);
2301 error
= vfs_setxattr(fhp
->fh_dentry
, name
, value
, size
, 0);
2303 if (!S_ISDIR(inode
->i_mode
) && type
== ACL_TYPE_DEFAULT
)
2306 error
= vfs_removexattr(fhp
->fh_dentry
, name
);
2307 if (error
== -ENODATA
)
2317 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */