2 * modified for EXT2FS support in Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
8 * Copyright (c) 1982, 1986, 1989, 1993
9 * The Regents of the University of California. All rights reserved.
10 * (c) UNIX System Laboratories, Inc.
11 * All or some portions of this file are derived from material licensed
12 * to the University of California by American Telephone and Telegraph
13 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
14 * the permission of UNIX System Laboratories, Inc.
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94
41 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
45 #include "opt_suiddir.h"
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/resourcevar.h>
50 #include <sys/kernel.h>
51 #include <sys/fcntl.h>
55 #include <sys/endian.h>
58 #include <sys/mount.h>
59 #include <sys/unistd.h>
61 #include <sys/vnode.h>
62 #include <sys/namei.h>
63 #include <sys/lockf.h>
64 #include <sys/event.h>
69 #include <vm/vm_extern.h>
70 #include <vm/vnode_pager.h>
72 #include <fs/fifofs/fifo.h>
74 #include <sys/signalvar.h>
75 #include <ufs/ufs/dir.h>
77 #include <gnu/fs/ext2fs/inode.h>
78 #include <gnu/fs/ext2fs/ext2_mount.h>
79 #include <gnu/fs/ext2fs/ext2_fs_sb.h>
80 #include <gnu/fs/ext2fs/fs.h>
81 #include <gnu/fs/ext2fs/ext2_extern.h>
82 #include <gnu/fs/ext2fs/ext2_fs.h>
84 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
86 static vop_access_t ext2_access;
87 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
88 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
90 static vop_close_t ext2_close;
91 static vop_create_t ext2_create;
92 static vop_fsync_t ext2_fsync;
93 static vop_getattr_t ext2_getattr;
94 static vop_link_t ext2_link;
95 static vop_mkdir_t ext2_mkdir;
96 static vop_mknod_t ext2_mknod;
97 static vop_open_t ext2_open;
98 static vop_pathconf_t ext2_pathconf;
99 static vop_print_t ext2_print;
100 static vop_read_t ext2_read;
101 static vop_readlink_t ext2_readlink;
102 static vop_remove_t ext2_remove;
103 static vop_rename_t ext2_rename;
104 static vop_rmdir_t ext2_rmdir;
105 static vop_setattr_t ext2_setattr;
106 static vop_strategy_t ext2_strategy;
107 static vop_symlink_t ext2_symlink;
108 static vop_write_t ext2_write;
109 static vop_vptofh_t ext2_vptofh;
110 static vop_close_t ext2fifo_close;
111 static vop_kqfilter_t ext2fifo_kqfilter;
113 /* Global vfs data structures for ext2. */
114 struct vop_vector ext2_vnodeops = {
115 .vop_default = &default_vnodeops,
116 .vop_access = ext2_access,
117 .vop_bmap = ext2_bmap,
118 .vop_cachedlookup = ext2_lookup,
119 .vop_close = ext2_close,
120 .vop_create = ext2_create,
121 .vop_fsync = ext2_fsync,
122 .vop_getattr = ext2_getattr,
123 .vop_inactive = ext2_inactive,
124 .vop_link = ext2_link,
125 .vop_lookup = vfs_cache_lookup,
126 .vop_mkdir = ext2_mkdir,
127 .vop_mknod = ext2_mknod,
128 .vop_open = ext2_open,
129 .vop_pathconf = ext2_pathconf,
130 .vop_poll = vop_stdpoll,
131 .vop_print = ext2_print,
132 .vop_read = ext2_read,
133 .vop_readdir = ext2_readdir,
134 .vop_readlink = ext2_readlink,
135 .vop_reallocblks = ext2_reallocblks,
136 .vop_reclaim = ext2_reclaim,
137 .vop_remove = ext2_remove,
138 .vop_rename = ext2_rename,
139 .vop_rmdir = ext2_rmdir,
140 .vop_setattr = ext2_setattr,
141 .vop_strategy = ext2_strategy,
142 .vop_symlink = ext2_symlink,
143 .vop_write = ext2_write,
144 .vop_vptofh = ext2_vptofh,
147 struct vop_vector ext2_fifoops = {
148 .vop_default = &fifo_specops,
149 .vop_access = ext2_access,
150 .vop_close = ext2fifo_close,
151 .vop_fsync = ext2_fsync,
152 .vop_getattr = ext2_getattr,
153 .vop_inactive = ext2_inactive,
154 .vop_kqfilter = ext2fifo_kqfilter,
155 .vop_print = ext2_print,
156 .vop_read = VOP_PANIC,
157 .vop_reclaim = ext2_reclaim,
158 .vop_setattr = ext2_setattr,
159 .vop_write = VOP_PANIC,
160 .vop_vptofh = ext2_vptofh,
163 #include <gnu/fs/ext2fs/ext2_readwrite.c>
166 * A virgin directory (no blushing please).
167 * Note that the type and namlen fields are reversed relative to ext2.
168 * Also, we don't use `struct odirtemplate', since it would just cause
169 * endianness problems.
171 static struct dirtemplate mastertemplate = {
172 0, 12, 1, EXT2_FT_DIR, ".",
173 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
175 static struct dirtemplate omastertemplate = {
176 0, 12, 1, EXT2_FT_UNKNOWN, ".",
177 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
188 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
190 if ((vp->v_type == VBLK || vp->v_type == VCHR))
191 ip->i_flag |= IN_LAZYMOD;
193 ip->i_flag |= IN_MODIFIED;
194 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
196 if (ip->i_flag & IN_ACCESS) {
197 ip->i_atime = ts.tv_sec;
198 ip->i_atimensec = ts.tv_nsec;
200 if (ip->i_flag & IN_UPDATE) {
201 ip->i_mtime = ts.tv_sec;
202 ip->i_mtimensec = ts.tv_nsec;
205 if (ip->i_flag & IN_CHANGE) {
206 ip->i_ctime = ts.tv_sec;
207 ip->i_ctimensec = ts.tv_nsec;
210 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
214 * Create a regular file
218 struct vop_create_args /* {
220 struct vnode **a_vpp;
221 struct componentname *a_cnp;
228 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
229 ap->a_dvp, ap->a_vpp, ap->a_cnp);
237 struct vop_open_args /* {
240 struct ucred *a_cred;
245 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
249 * Files marked append-only must be opened for appending.
251 if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
252 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
255 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
263 * Update the times on the inode.
267 struct vop_close_args /* {
270 struct ucred *a_cred;
274 struct vnode *vp = ap->a_vp;
277 if (vp->v_usecount > 1)
285 struct vop_access_args /* {
288 struct ucred *a_cred;
292 struct vnode *vp = ap->a_vp;
293 struct inode *ip = VTOI(vp);
294 accmode_t accmode = ap->a_accmode;
297 if (vp->v_type == VBLK || vp->v_type == VCHR)
301 * Disallow write attempts on read-only file systems;
302 * unless the file is a socket, fifo, or a block or
303 * character device resident on the file system.
305 if (accmode & VWRITE) {
306 switch (vp->v_type) {
310 if (vp->v_mount->mnt_flag & MNT_RDONLY)
318 /* If immutable bit set, nobody gets to write it. */
319 if ((accmode & VWRITE) && (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT)))
322 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
323 ap->a_accmode, ap->a_cred, NULL);
329 struct vop_getattr_args /* {
332 struct ucred *a_cred;
335 struct vnode *vp = ap->a_vp;
336 struct inode *ip = VTOI(vp);
337 struct vattr *vap = ap->a_vap;
341 * Copy from inode table
343 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
344 vap->va_fileid = ip->i_number;
345 vap->va_mode = ip->i_mode & ~IFMT;
346 vap->va_nlink = ip->i_nlink;
347 vap->va_uid = ip->i_uid;
348 vap->va_gid = ip->i_gid;
349 vap->va_rdev = ip->i_rdev;
350 vap->va_size = ip->i_size;
351 vap->va_atime.tv_sec = ip->i_atime;
352 vap->va_atime.tv_nsec = ip->i_atimensec;
353 vap->va_mtime.tv_sec = ip->i_mtime;
354 vap->va_mtime.tv_nsec = ip->i_mtimensec;
355 vap->va_ctime.tv_sec = ip->i_ctime;
356 vap->va_ctime.tv_nsec = ip->i_ctimensec;
357 vap->va_flags = ip->i_flags;
358 vap->va_gen = ip->i_gen;
359 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
360 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
361 vap->va_type = IFTOVT(ip->i_mode);
362 vap->va_filerev = ip->i_modrev;
367 * Set attribute vnode op. called from several syscalls
371 struct vop_setattr_args /* {
374 struct ucred *a_cred;
377 struct vattr *vap = ap->a_vap;
378 struct vnode *vp = ap->a_vp;
379 struct inode *ip = VTOI(vp);
380 struct ucred *cred = ap->a_cred;
381 struct thread *td = curthread;
385 * Check for unsettable attributes.
387 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
388 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
389 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
390 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
393 if (vap->va_flags != VNOVAL) {
394 /* Disallow flags not supported by ext2fs. */
395 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
398 if (vp->v_mount->mnt_flag & MNT_RDONLY)
401 * Callers may only modify the file flags on objects they
402 * have VADMIN rights for.
404 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
407 * Unprivileged processes and privileged processes in
408 * jail() are not permitted to unset system flags, or
409 * modify flags if any system flags are set.
410 * Privileged non-jail processes may not modify system flags
411 * if securelevel > 0 and any existing system flags are set.
413 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
415 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
416 error = securelevel_gt(cred, 0);
420 ip->i_flags = vap->va_flags;
423 & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
424 (vap->va_flags & UF_SETTABLE) != vap->va_flags)
426 ip->i_flags &= SF_SETTABLE;
427 ip->i_flags |= (vap->va_flags & UF_SETTABLE);
429 ip->i_flag |= IN_CHANGE;
430 if (vap->va_flags & (IMMUTABLE | APPEND))
433 if (ip->i_flags & (IMMUTABLE | APPEND))
436 * Go through the fields and update iff not VNOVAL.
438 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
439 if (vp->v_mount->mnt_flag & MNT_RDONLY)
441 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
445 if (vap->va_size != VNOVAL) {
447 * Disallow write attempts on read-only file systems;
448 * unless the file is a socket, fifo, or a block or
449 * character device resident on the file system.
451 switch (vp->v_type) {
456 if (vp->v_mount->mnt_flag & MNT_RDONLY)
462 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
465 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
466 if (vp->v_mount->mnt_flag & MNT_RDONLY)
470 * If times is NULL, ... The caller must be the owner of
471 * the file, have permission to write the file, or be the
473 * If times is non-NULL, ... The caller must be the owner of
474 * the file or be the super-user.
476 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
477 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
478 (error = VOP_ACCESS(vp, VWRITE, cred, td))))
480 if (vap->va_atime.tv_sec != VNOVAL)
481 ip->i_flag |= IN_ACCESS;
482 if (vap->va_mtime.tv_sec != VNOVAL)
483 ip->i_flag |= IN_CHANGE | IN_UPDATE;
485 if (vap->va_atime.tv_sec != VNOVAL) {
486 ip->i_atime = vap->va_atime.tv_sec;
487 ip->i_atimensec = vap->va_atime.tv_nsec;
489 if (vap->va_mtime.tv_sec != VNOVAL) {
490 ip->i_mtime = vap->va_mtime.tv_sec;
491 ip->i_mtimensec = vap->va_mtime.tv_nsec;
493 error = ext2_update(vp, 0);
498 if (vap->va_mode != (mode_t)VNOVAL) {
499 if (vp->v_mount->mnt_flag & MNT_RDONLY)
501 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
507 * Change the mode on a file.
508 * Inode must be locked before calling.
511 ext2_chmod(vp, mode, cred, td)
517 struct inode *ip = VTOI(vp);
521 * To modify the permissions on a file, must possess VADMIN
524 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
527 * Privileged processes may set the sticky bit on non-directories,
528 * as well as set the setgid bit on a file with a group that the
529 * process is not a member of.
531 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
532 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0);
536 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
537 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
541 ip->i_mode &= ~ALLPERMS;
542 ip->i_mode |= (mode & ALLPERMS);
543 ip->i_flag |= IN_CHANGE;
548 * Perform chown operation on inode ip;
549 * inode must be locked prior to call.
552 ext2_chown(vp, uid, gid, cred, td)
559 struct inode *ip = VTOI(vp);
564 if (uid == (uid_t)VNOVAL)
566 if (gid == (gid_t)VNOVAL)
569 * To modify the ownership of a file, must possess VADMIN
572 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
575 * To change the owner of a file, or change the group of a file
576 * to a group of which we are not a member, the caller must
579 if (uid != ip->i_uid || (gid != ip->i_gid &&
580 !groupmember(gid, cred))) {
581 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
589 ip->i_flag |= IN_CHANGE;
590 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
591 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0)
592 ip->i_mode &= ~(ISUID | ISGID);
598 * Synch an open file.
603 struct vop_fsync_args /* {
605 struct ucred *a_cred;
611 * Flush all dirty buffers associated with a vnode.
613 ext2_discard_prealloc(VTOI(ap->a_vp));
617 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
626 struct vop_mknod_args /* {
628 struct vnode **a_vpp;
629 struct componentname *a_cnp;
633 struct vattr *vap = ap->a_vap;
634 struct vnode **vpp = ap->a_vpp;
639 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
640 ap->a_dvp, vpp, ap->a_cnp);
644 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
645 if (vap->va_rdev != VNOVAL) {
647 * Want to be able to use this to make badblock
648 * inodes, so don't truncate the dev number.
650 ip->i_rdev = vap->va_rdev;
653 * Remove inode, then reload it through VFS_VGET so it is
654 * checked to see if it is an alias of an existing entry in
655 * the inode cache. XXX I don't believe this is necessary now.
657 (*vpp)->v_type = VNON;
658 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
661 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
671 struct vop_remove_args /* {
674 struct componentname *a_cnp;
678 struct vnode *vp = ap->a_vp;
679 struct vnode *dvp = ap->a_dvp;
683 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
684 (VTOI(dvp)->i_flags & APPEND)) {
688 error = ext2_dirremove(dvp, ap->a_cnp);
691 ip->i_flag |= IN_CHANGE;
702 struct vop_link_args /* {
703 struct vnode *a_tdvp;
705 struct componentname *a_cnp;
708 struct vnode *vp = ap->a_vp;
709 struct vnode *tdvp = ap->a_tdvp;
710 struct componentname *cnp = ap->a_cnp;
715 if ((cnp->cn_flags & HASBUF) == 0)
716 panic("ext2_link: no name");
718 if (tdvp->v_mount != vp->v_mount) {
723 if ((nlink_t)ip->i_nlink >= LINK_MAX) {
727 if (ip->i_flags & (IMMUTABLE | APPEND)) {
732 ip->i_flag |= IN_CHANGE;
733 error = ext2_update(vp, 1);
735 error = ext2_direnter(ip, tdvp, cnp);
738 ip->i_flag |= IN_CHANGE;
745 * Rename system call.
746 * See comments in sys/ufs/ufs/ufs_vnops.c
750 struct vop_rename_args /* {
751 struct vnode *a_fdvp;
753 struct componentname *a_fcnp;
754 struct vnode *a_tdvp;
756 struct componentname *a_tcnp;
759 struct vnode *tvp = ap->a_tvp;
760 struct vnode *tdvp = ap->a_tdvp;
761 struct vnode *fvp = ap->a_fvp;
762 struct vnode *fdvp = ap->a_fdvp;
763 struct componentname *tcnp = ap->a_tcnp;
764 struct componentname *fcnp = ap->a_fcnp;
765 struct inode *ip, *xp, *dp;
766 struct dirtemplate dirbuf;
767 int doingdirectory = 0, oldparent = 0, newparent = 0;
772 if ((tcnp->cn_flags & HASBUF) == 0 ||
773 (fcnp->cn_flags & HASBUF) == 0)
774 panic("ext2_rename: no name");
777 * Check for cross-device rename.
779 if ((fvp->v_mount != tdvp->v_mount) ||
780 (tvp && (fvp->v_mount != tvp->v_mount))) {
794 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
795 (VTOI(tdvp)->i_flags & APPEND))) {
801 * Renaming a file to itself has no effect. The upper layers should
802 * not call us in that case. Temporarily just warn if they do.
805 printf("ext2_rename: fvp == tvp (can't happen)\n");
810 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
814 if (ip->i_nlink >= LINK_MAX) {
819 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
820 || (dp->i_flags & APPEND)) {
825 if ((ip->i_mode & IFMT) == IFDIR) {
827 * Avoid ".", "..", and aliases of "." for obvious reasons.
829 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
830 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
831 (ip->i_flag & IN_RENAME)) {
836 ip->i_flag |= IN_RENAME;
837 oldparent = dp->i_number;
843 * When the target exists, both the directory
844 * and target vnodes are returned locked.
852 * 1) Bump link count while we're moving stuff
853 * around. If we crash somewhere before
854 * completing our work, the link count
855 * may be wrong, but correctable.
858 ip->i_flag |= IN_CHANGE;
859 if ((error = ext2_update(fvp, 1)) != 0) {
865 * If ".." must be changed (ie the directory gets a new
866 * parent) then the source directory must not be in the
867 * directory hierarchy above the target, as this would
868 * orphan everything below the source directory. Also
869 * the user must have write permission in the source so
870 * as to be able to change "..". We must repeat the call
871 * to namei, as the parent directory is unlocked by the
872 * call to checkpath().
874 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
876 if (oldparent != dp->i_number)
877 newparent = dp->i_number;
878 if (doingdirectory && newparent) {
879 if (error) /* write access check above */
883 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
887 error = relookup(tdvp, &tvp, tcnp);
897 * 2) If target doesn't exist, link the target
898 * to the source and unlink the source.
899 * Otherwise, rewrite the target directory
900 * entry to reference the source inode and
901 * expunge the original entry's existence.
904 if (dp->i_devvp != ip->i_devvp)
905 panic("ext2_rename: EXDEV");
907 * Account for ".." in new directory.
908 * When source and destination have the same
909 * parent we don't fool with the link count.
911 if (doingdirectory && newparent) {
912 if ((nlink_t)dp->i_nlink >= LINK_MAX) {
917 dp->i_flag |= IN_CHANGE;
918 error = ext2_update(tdvp, 1);
922 error = ext2_direnter(ip, tdvp, tcnp);
924 if (doingdirectory && newparent) {
926 dp->i_flag |= IN_CHANGE;
927 (void)ext2_update(tdvp, 1);
933 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
934 panic("ext2_rename: EXDEV");
936 * Short circuit rename(foo, foo).
938 if (xp->i_number == ip->i_number)
939 panic("ext2_rename: same file");
941 * If the parent directory is "sticky", then the user must
942 * own the parent directory, or the destination of the rename,
943 * otherwise the destination may not be changed (except by
944 * root). This implements append-only directories.
946 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
947 tcnp->cn_cred->cr_uid != dp->i_uid &&
948 xp->i_uid != tcnp->cn_cred->cr_uid) {
953 * Target must be empty if a directory and have no links
954 * to it. Also, ensure source and target are compatible
955 * (both directories, or both not directories).
957 if ((xp->i_mode&IFMT) == IFDIR) {
958 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
963 if (!doingdirectory) {
968 } else if (doingdirectory) {
972 error = ext2_dirrewrite(dp, ip, tcnp);
976 * If the target directory is in the same
977 * directory as the source directory,
978 * decrement the link count on the parent
979 * of the target directory.
981 if (doingdirectory && !newparent) {
983 dp->i_flag |= IN_CHANGE;
987 * Adjust the link count of the target to
988 * reflect the dirrewrite above. If this is
989 * a directory it is empty and there are
990 * no links to it, so we can squash the inode and
991 * any space associated with it. We disallowed
992 * renaming over top of a directory with links to
993 * it above, as the remaining link would point to
994 * a directory without "." or ".." entries.
997 if (doingdirectory) {
998 if (--xp->i_nlink != 0)
999 panic("ext2_rename: linked directory");
1000 error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
1001 tcnp->cn_cred, tcnp->cn_thread);
1003 xp->i_flag |= IN_CHANGE;
1009 * 3) Unlink the source.
1011 fcnp->cn_flags &= ~MODMASK;
1012 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
1014 error = relookup(fdvp, &fvp, fcnp);
1022 * From name has disappeared.
1025 panic("ext2_rename: lost dir entry");
1030 * Ensure that the directory entry still exists and has not
1031 * changed while the new name has been entered. If the source is
1032 * a file then the entry may have been unlinked or renamed. In
1033 * either case there is no further work to be done. If the source
1034 * is a directory then it cannot have been rmdir'ed; its link
1035 * count of three would cause a rmdir to fail with ENOTEMPTY.
1036 * The IN_RENAME flag ensures that it cannot be moved by another
1041 panic("ext2_rename: lost dir entry");
1044 * If the source is a directory with a
1045 * new parent, the link count of the old
1046 * parent directory must be decremented
1047 * and ".." set to point to the new parent.
1049 if (doingdirectory && newparent) {
1051 dp->i_flag |= IN_CHANGE;
1052 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
1053 sizeof (struct dirtemplate), (off_t)0,
1054 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1055 tcnp->cn_cred, NOCRED, NULL, NULL);
1057 /* Like ufs little-endian: */
1058 namlen = dirbuf.dotdot_type;
1060 dirbuf.dotdot_name[0] != '.' ||
1061 dirbuf.dotdot_name[1] != '.') {
1062 ext2_dirbad(xp, (doff_t)12,
1063 "rename: mangled dir");
1065 dirbuf.dotdot_ino = newparent;
1066 (void) vn_rdwr(UIO_WRITE, fvp,
1068 sizeof (struct dirtemplate),
1069 (off_t)0, UIO_SYSSPACE,
1070 IO_NODELOCKED | IO_SYNC |
1071 IO_NOMACCHECK, tcnp->cn_cred,
1072 NOCRED, NULL, NULL);
1077 error = ext2_dirremove(fdvp, fcnp);
1080 xp->i_flag |= IN_CHANGE;
1082 xp->i_flag &= ~IN_RENAME;
1097 ip->i_flag &= ~IN_RENAME;
1098 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
1100 ip->i_flag |= IN_CHANGE;
1101 ip->i_flag &= ~IN_RENAME;
1113 struct vop_mkdir_args /* {
1114 struct vnode *a_dvp;
1115 struct vnode **a_vpp;
1116 struct componentname *a_cnp;
1117 struct vattr *a_vap;
1120 struct vnode *dvp = ap->a_dvp;
1121 struct vattr *vap = ap->a_vap;
1122 struct componentname *cnp = ap->a_cnp;
1123 struct inode *ip, *dp;
1125 struct dirtemplate dirtemplate, *dtp;
1129 if ((cnp->cn_flags & HASBUF) == 0)
1130 panic("ext2_mkdir: no name");
1133 if ((nlink_t)dp->i_nlink >= LINK_MAX) {
1137 dmode = vap->va_mode & 0777;
1140 * Must simulate part of ext2_makeinode here to acquire the inode,
1141 * but not have it entered in the parent directory. The entry is
1142 * made later after writing "." and ".." entries.
1144 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
1148 ip->i_gid = dp->i_gid;
1152 * if we are hacking owners here, (only do this where told to)
1153 * and we are not giving it TOO root, (would subvert quotas)
1154 * then go ahead and give it to the other user.
1155 * The new directory also inherits the SUID bit.
1156 * If user's UID and dir UID are the same,
1157 * 'give it away' so that the SUID is still forced on.
1159 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1160 (dp->i_mode & ISUID) && dp->i_uid) {
1162 ip->i_uid = dp->i_uid;
1164 ip->i_uid = cnp->cn_cred->cr_uid;
1168 ip->i_uid = cnp->cn_cred->cr_uid;
1170 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1172 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1174 if (cnp->cn_flags & ISWHITEOUT)
1175 ip->i_flags |= UF_OPAQUE;
1176 error = ext2_update(tvp, 1);
1179 * Bump link count in parent directory
1180 * to reflect work done below. Should
1181 * be done before reference is created
1182 * so reparation is possible if we crash.
1185 dp->i_flag |= IN_CHANGE;
1186 error = ext2_update(dvp, 1);
1190 /* Initialize directory with "." and ".." from static template. */
1191 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
1192 EXT2_FEATURE_INCOMPAT_FILETYPE))
1193 dtp = &mastertemplate;
1195 dtp = &omastertemplate;
1197 dirtemplate.dot_ino = ip->i_number;
1198 dirtemplate.dotdot_ino = dp->i_number;
1199 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE
1200 * so let's just redefine it - for this function only
1203 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->s_blocksize
1204 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
1205 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
1206 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE,
1207 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
1211 dp->i_flag |= IN_CHANGE;
1214 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
1215 /* XXX should grow with balloc() */
1216 panic("ext2_mkdir: blksize");
1218 ip->i_size = DIRBLKSIZ;
1219 ip->i_flag |= IN_CHANGE;
1222 /* Directory set up, now install its entry in the parent directory. */
1223 error = ext2_direnter(ip, dvp, cnp);
1226 dp->i_flag |= IN_CHANGE;
1230 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
1231 * for us because we set the link count to 0.
1235 ip->i_flag |= IN_CHANGE;
1242 #define DIRBLKSIZ DEV_BSIZE
1246 * Rmdir system call.
1250 struct vop_rmdir_args /* {
1251 struct vnode *a_dvp;
1253 struct componentname *a_cnp;
1256 struct vnode *vp = ap->a_vp;
1257 struct vnode *dvp = ap->a_dvp;
1258 struct componentname *cnp = ap->a_cnp;
1259 struct inode *ip, *dp;
1266 * Verify the directory is empty (and valid).
1267 * (Rmdir ".." won't be valid since
1268 * ".." will contain a reference to
1269 * the current directory and thus be
1273 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1277 if ((dp->i_flags & APPEND)
1278 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1283 * Delete reference to directory before purging
1284 * inode. If we crash in between, the directory
1285 * will be reattached to lost+found,
1287 error = ext2_dirremove(dvp, cnp);
1291 dp->i_flag |= IN_CHANGE;
1295 * Truncate inode. The only stuff left
1296 * in the directory is "." and "..". The
1297 * "." reference is inconsequential since
1298 * we're quashing it. The ".." reference
1299 * has already been adjusted above. We've
1300 * removed the "." reference and the reference
1301 * in the parent directory, but there may be
1302 * other hard links so decrement by 2 and
1303 * worry about them later.
1306 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
1308 cache_purge(ITOV(ip));
1309 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1315 * symlink -- make a symbolic link
1319 struct vop_symlink_args /* {
1320 struct vnode *a_dvp;
1321 struct vnode **a_vpp;
1322 struct componentname *a_cnp;
1323 struct vattr *a_vap;
1327 struct vnode *vp, **vpp = ap->a_vpp;
1331 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1336 len = strlen(ap->a_target);
1337 if (len < vp->v_mount->mnt_maxsymlinklen) {
1339 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
1341 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1343 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
1344 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1345 ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
1352 * Return target name of a symbolic link
1356 struct vop_readlink_args /* {
1359 struct ucred *a_cred;
1362 struct vnode *vp = ap->a_vp;
1363 struct inode *ip = VTOI(vp);
1367 if (isize < vp->v_mount->mnt_maxsymlinklen) {
1368 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
1371 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1375 * Calculate the logical to physical mapping if not done already,
1376 * then call the device strategy routine.
1378 * In order to be able to swap to a file, the ext2_bmaparray() operation may not
1379 * deadlock on memory. See ext2_bmap() for details.
1383 struct vop_strategy_args /* {
1388 struct buf *bp = ap->a_bp;
1389 struct vnode *vp = ap->a_vp;
1396 if (vp->v_type == VBLK || vp->v_type == VCHR)
1397 panic("ext2_strategy: spec");
1398 if (bp->b_blkno == bp->b_lblkno) {
1399 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
1400 bp->b_blkno = blkno;
1402 bp->b_error = error;
1403 bp->b_ioflags |= BIO_ERROR;
1407 if ((long)bp->b_blkno == -1)
1410 if ((long)bp->b_blkno == -1) {
1414 bp->b_iooffset = dbtob(bp->b_blkno);
1415 bo = VFSTOEXT2(vp->v_mount)->um_bo;
1416 BO_STRATEGY(bo, bp);
1421 * Print out the contents of an inode.
1425 struct vop_print_args /* {
1429 struct vnode *vp = ap->a_vp;
1430 struct inode *ip = VTOI(vp);
1432 vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number);
1433 if (vp->v_type == VFIFO)
1440 * Close wrapper for fifos.
1442 * Update the times on the inode then do device close.
1446 struct vop_close_args /* {
1449 struct ucred *a_cred;
1450 struct thread *a_td;
1453 struct vnode *vp = ap->a_vp;
1456 if (vp->v_usecount > 1)
1459 return (fifo_specops.vop_close(ap));
1463 * Kqfilter wrapper for fifos.
1465 * Fall through to ext2 kqfilter routines if needed
1468 ext2fifo_kqfilter(ap)
1469 struct vop_kqfilter_args *ap;
1473 error = fifo_specops.vop_kqfilter(ap);
1475 error = vfs_kqfilter(ap);
1480 * Return POSIX pathconf information applicable to ext2 filesystems.
1484 struct vop_pathconf_args /* {
1491 switch (ap->a_name) {
1493 *ap->a_retval = LINK_MAX;
1496 *ap->a_retval = NAME_MAX;
1499 *ap->a_retval = PATH_MAX;
1502 *ap->a_retval = PIPE_BUF;
1504 case _PC_CHOWN_RESTRICTED:
1517 * Vnode pointer to File handle
1522 struct vop_vptofh_args /* {
1530 ip = VTOI(ap->a_vp);
1531 ufhp = (struct ufid *)ap->a_fhp;
1532 ufhp->ufid_len = sizeof(struct ufid);
1533 ufhp->ufid_ino = ip->i_number;
1534 ufhp->ufid_gen = ip->i_gen;
1539 * Initialize the vnode associated with a new inode, handle aliased
1543 ext2_vinit(mntp, fifoops, vpp)
1545 struct vop_vector *fifoops;
1553 vp->v_type = IFTOVT(ip->i_mode);
1554 if (vp->v_type == VFIFO)
1557 if (ip->i_number == ROOTINO)
1558 vp->v_vflag |= VV_ROOT;
1559 ip->i_modrev = init_va_filerev();
1565 * Allocate a new inode.
1568 ext2_makeinode(mode, dvp, vpp, cnp)
1572 struct componentname *cnp;
1574 struct inode *ip, *pdir;
1580 if ((cnp->cn_flags & HASBUF) == 0)
1581 panic("ext2_makeinode: no name");
1584 if ((mode & IFMT) == 0)
1587 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
1592 ip->i_gid = pdir->i_gid;
1597 * not the owner of the directory,
1598 * and we are hacking owners here, (only do this where told to)
1599 * and we are not giving it TOO root, (would subvert quotas)
1600 * then go ahead and give it to the other user.
1601 * Note that this drops off the execute bits for security.
1603 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1604 (pdir->i_mode & ISUID) &&
1605 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
1606 ip->i_uid = pdir->i_uid;
1609 ip->i_uid = cnp->cn_cred->cr_uid;
1613 ip->i_uid = cnp->cn_cred->cr_uid;
1615 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1617 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1619 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
1620 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0))
1621 ip->i_mode &= ~ISGID;
1624 if (cnp->cn_flags & ISWHITEOUT)
1625 ip->i_flags |= UF_OPAQUE;
1628 * Make sure inode goes to disk before directory entry.
1630 error = ext2_update(tvp, 1);
1633 error = ext2_direnter(ip, dvp, cnp);
1642 * Write error occurred trying to update the inode
1643 * or the directory so must deallocate the inode.
1646 ip->i_flag |= IN_CHANGE;