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
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44 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
45 * @(#)ext2_vnops.c 8.7 (Berkeley) 2/3/94
46 * $FreeBSD: src/sys/gnu/ext2fs/ext2_vnops.c,v 1.51.2.2 2003/01/02 17:26:18 bde Exp $
47 * $DragonFly: src/sys/vfs/gnu/ext2fs/ext2_vnops.c,v 1.13 2004/07/02 15:43:10 joerg Exp $
50 #include "opt_quota.h"
51 #include "opt_suiddir.h"
53 #include <sys/param.h>
54 #include <sys/systm.h>
55 #include <sys/resourcevar.h>
56 #include <sys/kernel.h>
60 #include <sys/mount.h>
62 #include <sys/vnode.h>
63 #include <sys/namei.h>
66 #include <vm/vm_extern.h>
67 #include <vm/vm_zone.h>
68 #include <vm/vnode_pager.h>
71 #include <sys/signalvar.h>
72 #include <vfs/ufs/dir.h>
73 #include <vfs/ufs/quota.h>
74 #include <vfs/ufs/inode.h>
75 #include <vfs/ufs/ufsmount.h>
76 #include <vfs/ufs/ufs_extern.h>
78 #include "ext2_fs_sb.h"
80 #include "ext2_extern.h"
83 static int ext2_makeinode (int mode, struct vnode *, struct vnode **, struct componentname *);
85 static int ext2_fsync (struct vop_fsync_args *);
86 static int ext2_read (struct vop_read_args *);
87 static int ext2_write (struct vop_write_args *);
88 static int ext2_remove (struct vop_remove_args *);
89 static int ext2_link (struct vop_link_args *);
90 static int ext2_rename (struct vop_rename_args *);
91 static int ext2_mkdir (struct vop_mkdir_args *);
92 static int ext2_rmdir (struct vop_rmdir_args *);
93 static int ext2_create (struct vop_create_args *);
94 static int ext2_mknod (struct vop_mknod_args *);
95 static int ext2_symlink (struct vop_symlink_args *);
96 static int ext2_getpages (struct vop_getpages_args *);
97 static int ext2_putpages (struct vop_putpages_args *);
99 /* Global vfs data structures for ufs. */
100 vop_t **ext2_vnodeop_p;
101 static struct vnodeopv_entry_desc ext2_vnodeop_entries[] = {
102 { &vop_default_desc, (vop_t *) ufs_vnoperate },
103 { &vop_cachedlookup_desc, (vop_t *) ext2_lookup },
104 { &vop_fsync_desc, (vop_t *) ext2_fsync },
105 { &vop_inactive_desc, (vop_t *) ext2_inactive },
106 { &vop_lookup_desc, (vop_t *) vfs_cache_lookup },
107 { &vop_read_desc, (vop_t *) ext2_read },
108 { &vop_readdir_desc, (vop_t *) ext2_readdir },
109 { &vop_reallocblks_desc, (vop_t *) ext2_reallocblks },
110 { &vop_write_desc, (vop_t *) ext2_write },
111 { &vop_remove_desc, (vop_t *) ext2_remove },
112 { &vop_link_desc, (vop_t *) ext2_link },
113 { &vop_rename_desc, (vop_t *) ext2_rename },
114 { &vop_mkdir_desc, (vop_t *) ext2_mkdir },
115 { &vop_rmdir_desc, (vop_t *) ext2_rmdir },
116 { &vop_create_desc, (vop_t *) ext2_create },
117 { &vop_mknod_desc, (vop_t *) ext2_mknod },
118 { &vop_symlink_desc, (vop_t *) ext2_symlink },
119 { &vop_getpages_desc, (vop_t *) ext2_getpages },
120 { &vop_putpages_desc, (vop_t *) ext2_putpages },
123 static struct vnodeopv_desc ext2fs_vnodeop_opv_desc =
124 { &ext2_vnodeop_p, ext2_vnodeop_entries };
126 vop_t **ext2_specop_p;
127 static struct vnodeopv_entry_desc ext2_specop_entries[] = {
128 { &vop_default_desc, (vop_t *) ufs_vnoperatespec },
129 { &vop_fsync_desc, (vop_t *) ext2_fsync },
130 { &vop_inactive_desc, (vop_t *) ext2_inactive },
133 static struct vnodeopv_desc ext2fs_specop_opv_desc =
134 { &ext2_specop_p, ext2_specop_entries };
136 vop_t **ext2_fifoop_p;
137 static struct vnodeopv_entry_desc ext2_fifoop_entries[] = {
138 { &vop_default_desc, (vop_t *) ufs_vnoperatefifo },
139 { &vop_fsync_desc, (vop_t *) ext2_fsync },
140 { &vop_inactive_desc, (vop_t *) ext2_inactive },
143 static struct vnodeopv_desc ext2fs_fifoop_opv_desc =
144 { &ext2_fifoop_p, ext2_fifoop_entries };
146 VNODEOP_SET(ext2fs_vnodeop_opv_desc);
147 VNODEOP_SET(ext2fs_specop_opv_desc);
148 VNODEOP_SET(ext2fs_fifoop_opv_desc);
150 #include "ext2_readwrite.c"
153 * A virgin directory (no blushing please).
154 * Note that the type and namlen fields are reversed relative to ufs.
155 * Also, we don't use `struct odirtemplate', since it would just cause
156 * endianness problems.
158 static struct dirtemplate mastertemplate = {
159 0, 12, 1, EXT2_FT_DIR, ".",
160 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
162 static struct dirtemplate omastertemplate = {
163 0, 12, 1, EXT2_FT_UNKNOWN, ".",
164 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
168 * Create a regular file
170 * ext2_create(struct vnode *a_dvp, struct vnode **a_vpp,
171 * struct componentname *a_cnp, struct vattr *a_vap)
174 ext2_create(struct vop_create_args *ap)
179 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
180 ap->a_dvp, ap->a_vpp, ap->a_cnp);
187 * Synch an open file.
189 * ext2_fsync(struct vnode *a_vp, struct ucred *a_cred, int a_waitfor,
194 ext2_fsync(struct vop_fsync_args *ap)
196 struct vnode *vp = ap->a_vp;
202 * XXX why is all this fs specific?
206 * Flush all dirty buffers associated with a vnode.
208 ext2_discard_prealloc(VTOI(vp));
212 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
213 nbp = TAILQ_NEXT(bp, b_vnbufs);
214 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT))
216 if ((bp->b_flags & B_DELWRI) == 0)
217 panic("ext2_fsync: not dirty");
221 * Wait for I/O associated with indirect blocks to complete,
222 * since there is no way to quickly wait for them below.
224 if (bp->b_vp == vp || ap->a_waitfor == MNT_NOWAIT)
230 if (ap->a_waitfor == MNT_WAIT) {
231 while (vp->v_numoutput) {
232 vp->v_flag |= VBWAIT;
233 tsleep(&vp->v_numoutput, 0, "e2fsyn", 0);
236 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) {
237 vprint("ext2_fsync: dirty", vp);
243 return (UFS_UPDATE(ap->a_vp, ap->a_waitfor == MNT_WAIT));
249 * ext2_mknod(struct vnode *a_dvp, struct vnode **a_vpp,
250 * struct componentname *a_cnp, struct vattr *a_vap)
254 ext2_mknod(struct vop_mknod_args *ap)
256 struct vattr *vap = ap->a_vap;
257 struct vnode **vpp = ap->a_vpp;
262 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
263 ap->a_dvp, vpp, ap->a_cnp);
267 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
268 if (vap->va_rdev != VNOVAL) {
270 * Want to be able to use this to make badblock
271 * inodes, so don't truncate the dev number.
273 ip->i_rdev = vap->va_rdev;
276 * Remove inode, then reload it through VFS_VGET so it is
277 * checked to see if it is an alias of an existing entry in
281 (*vpp)->v_type = VNON;
282 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
284 error = VFS_VGET(ap->a_dvp->v_mount, ino, vpp);
293 * ext2_remove(struct vnode *a_dvp, struct vnode *a_vp,
294 * struct componentname *a_cnp)
297 ext2_remove(struct vop_remove_args *ap)
300 struct vnode *vp = ap->a_vp;
301 struct vnode *dvp = ap->a_dvp;
305 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
306 (VTOI(dvp)->i_flags & APPEND)) {
310 error = ext2_dirremove(dvp, ap->a_cnp);
313 ip->i_flag |= IN_CHANGE;
322 * ext2_link(struct vnode *a_tdvp, struct vnode *a_vp,
323 * struct componentname *a_cnp)
326 ext2_link(struct vop_link_args *ap)
328 struct vnode *vp = ap->a_vp;
329 struct vnode *tdvp = ap->a_tdvp;
330 struct componentname *cnp = ap->a_cnp;
331 struct thread *td = cnp->cn_td;
336 if ((cnp->cn_flags & CNP_HASBUF) == 0)
337 panic("ufs_link: no name");
339 if (tdvp->v_mount != vp->v_mount) {
343 if (tdvp != vp && (error = vn_lock(vp, NULL, LK_EXCLUSIVE, td))) {
347 if ((nlink_t)ip->i_nlink >= LINK_MAX) {
351 if (ip->i_flags & (IMMUTABLE | APPEND)) {
356 ip->i_flag |= IN_CHANGE;
357 error = UFS_UPDATE(vp, 1);
359 error = ext2_direnter(ip, tdvp, cnp);
362 ip->i_flag |= IN_CHANGE;
366 VOP_UNLOCK(vp, NULL, 0, td);
372 * Rename system call.
373 * See comments in sys/ufs/ufs/ufs_vnops.c
375 * ext2_rename(struct vnode *a_fdvp, struct vnode *a_fvp,
376 * struct componentname *a_fcnp, struct vnode *a_tdvp,
377 * struct vnode *a_tvp, struct componentname *a_tcnp)
380 ext2_rename(struct vop_rename_args *ap)
382 struct vnode *tvp = ap->a_tvp;
383 struct vnode *tdvp = ap->a_tdvp;
384 struct vnode *fvp = ap->a_fvp;
385 struct vnode *fdvp = ap->a_fdvp;
386 struct componentname *tcnp = ap->a_tcnp;
387 struct componentname *fcnp = ap->a_fcnp;
388 struct thread *td = fcnp->cn_td;
389 struct inode *ip, *xp, *dp;
390 struct dirtemplate dirbuf;
391 int doingdirectory = 0, oldparent = 0, newparent = 0;
396 if ((tcnp->cn_flags & CNP_HASBUF) == 0 ||
397 (fcnp->cn_flags & CNP_HASBUF) == 0)
398 panic("ufs_rename: no name");
401 * Check for cross-device rename.
403 if ((fvp->v_mount != tdvp->v_mount) ||
404 (tvp && (fvp->v_mount != tvp->v_mount))) {
418 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
419 (VTOI(tdvp)->i_flags & APPEND))) {
425 * Renaming a file to itself has no effect. The upper layers should
426 * not call us in that case. Temporarily just warn if they do.
429 printf("ext2_rename: fvp == tvp (can't happen)\n");
434 if ((error = vn_lock(fvp, NULL, LK_EXCLUSIVE, td)) != 0)
438 if (ip->i_nlink >= LINK_MAX) {
439 VOP_UNLOCK(fvp, NULL, 0, td);
443 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
444 || (dp->i_flags & APPEND)) {
445 VOP_UNLOCK(fvp, NULL, 0, td);
449 if ((ip->i_mode & IFMT) == IFDIR) {
451 * Avoid ".", "..", and aliases of "." for obvious reasons.
453 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
454 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & CNP_ISDOTDOT ||
455 (ip->i_flag & IN_RENAME)) {
456 VOP_UNLOCK(fvp, NULL, 0, td);
460 ip->i_flag |= IN_RENAME;
461 oldparent = dp->i_number;
467 * When the target exists, both the directory
468 * and target vnodes are returned locked.
476 * 1) Bump link count while we're moving stuff
477 * around. If we crash somewhere before
478 * completing our work, the link count
479 * may be wrong, but correctable.
482 ip->i_flag |= IN_CHANGE;
483 if ((error = UFS_UPDATE(fvp, 1)) != 0) {
484 VOP_UNLOCK(fvp, NULL, 0, td);
489 * If ".." must be changed (ie the directory gets a new
490 * parent) then the source directory must not be in the
491 * directory heirarchy above the target, as this would
492 * orphan everything below the source directory. Also
493 * the user must have write permission in the source so
494 * as to be able to change "..". We must repeat the call
495 * to namei, as the parent directory is unlocked by the
496 * call to checkpath().
498 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_td);
499 VOP_UNLOCK(fvp, NULL, 0, td);
500 if (oldparent != dp->i_number)
501 newparent = dp->i_number;
502 if (doingdirectory && newparent) {
503 if (error) /* write access check above */
507 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
511 error = relookup(tdvp, &tvp, tcnp);
521 * 2) If target doesn't exist, link the target
522 * to the source and unlink the source.
523 * Otherwise, rewrite the target directory
524 * entry to reference the source inode and
525 * expunge the original entry's existence.
528 if (dp->i_dev != ip->i_dev)
529 panic("ufs_rename: EXDEV");
531 * Account for ".." in new directory.
532 * When source and destination have the same
533 * parent we don't fool with the link count.
535 if (doingdirectory && newparent) {
536 if ((nlink_t)dp->i_nlink >= LINK_MAX) {
541 dp->i_flag |= IN_CHANGE;
542 error = UFS_UPDATE(tdvp, 1);
546 error = ext2_direnter(ip, tdvp, tcnp);
548 if (doingdirectory && newparent) {
550 dp->i_flag |= IN_CHANGE;
551 (void)UFS_UPDATE(tdvp, 1);
557 if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
558 panic("ufs_rename: EXDEV");
560 * Short circuit rename(foo, foo).
562 if (xp->i_number == ip->i_number)
563 panic("ufs_rename: same file");
565 * If the parent directory is "sticky", then the user must
566 * own the parent directory, or the destination of the rename,
567 * otherwise the destination may not be changed (except by
568 * root). This implements append-only directories.
570 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
571 tcnp->cn_cred->cr_uid != dp->i_uid &&
572 xp->i_uid != tcnp->cn_cred->cr_uid) {
577 * Target must be empty if a directory and have no links
578 * to it. Also, ensure source and target are compatible
579 * (both directories, or both not directories).
581 if ((xp->i_mode&IFMT) == IFDIR) {
582 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
587 if (!doingdirectory) {
592 } else if (doingdirectory) {
596 error = ext2_dirrewrite(dp, ip, tcnp);
600 * If the target directory is in the same
601 * directory as the source directory,
602 * decrement the link count on the parent
603 * of the target directory.
605 if (doingdirectory && !newparent) {
607 dp->i_flag |= IN_CHANGE;
611 * Adjust the link count of the target to
612 * reflect the dirrewrite above. If this is
613 * a directory it is empty and there are
614 * no links to it, so we can squash the inode and
615 * any space associated with it. We disallowed
616 * renaming over top of a directory with links to
617 * it above, as the remaining link would point to
618 * a directory without "." or ".." entries.
621 if (doingdirectory) {
622 if (--xp->i_nlink != 0)
623 panic("ufs_rename: linked directory");
624 error = UFS_TRUNCATE(tvp, (off_t)0, IO_SYNC,
625 tcnp->cn_cred, tcnp->cn_td);
627 xp->i_flag |= IN_CHANGE;
633 * 3) Unlink the source.
635 fcnp->cn_flags &= ~CNP_MODMASK;
636 fcnp->cn_flags |= CNP_LOCKPARENT | CNP_LOCKLEAF;
638 error = relookup(fdvp, &fvp, fcnp);
646 * From name has disappeared.
649 panic("ufs_rename: lost dir entry");
654 * Ensure that the directory entry still exists and has not
655 * changed while the new name has been entered. If the source is
656 * a file then the entry may have been unlinked or renamed. In
657 * either case there is no further work to be done. If the source
658 * is a directory then it cannot have been rmdir'ed; its link
659 * count of three would cause a rmdir to fail with ENOTEMPTY.
660 * The IN_RENAME flag ensures that it cannot be moved by another
665 panic("ufs_rename: lost dir entry");
668 * If the source is a directory with a
669 * new parent, the link count of the old
670 * parent directory must be decremented
671 * and ".." set to point to the new parent.
673 if (doingdirectory && newparent) {
675 dp->i_flag |= IN_CHANGE;
676 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
677 sizeof (struct dirtemplate), (off_t)0,
678 UIO_SYSSPACE, IO_NODELOCKED,
679 tcnp->cn_cred, (int *)0, NULL);
681 /* Like ufs little-endian: */
682 namlen = dirbuf.dotdot_type;
684 dirbuf.dotdot_name[0] != '.' ||
685 dirbuf.dotdot_name[1] != '.') {
686 ufs_dirbad(xp, (doff_t)12,
687 "rename: mangled dir");
689 dirbuf.dotdot_ino = newparent;
690 (void) vn_rdwr(UIO_WRITE, fvp,
692 sizeof (struct dirtemplate),
693 (off_t)0, UIO_SYSSPACE,
694 IO_NODELOCKED|IO_SYNC,
695 tcnp->cn_cred, (int *)0,
701 error = ext2_dirremove(fdvp, fcnp);
704 xp->i_flag |= IN_CHANGE;
706 xp->i_flag &= ~IN_RENAME;
721 ip->i_flag &= ~IN_RENAME;
722 if (vn_lock(fvp, NULL, LK_EXCLUSIVE, td) == 0) {
724 ip->i_flag |= IN_CHANGE;
725 ip->i_flag &= ~IN_RENAME;
735 * ext2_mkdir(struct vnode *a_dvp, struct vnode **a_vpp,
736 * struct componentname *a_cnp, struct vattr *a_vap)
739 ext2_mkdir(struct vop_mkdir_args *ap)
741 struct vnode *dvp = ap->a_dvp;
742 struct vattr *vap = ap->a_vap;
743 struct componentname *cnp = ap->a_cnp;
744 struct inode *ip, *dp;
746 struct dirtemplate dirtemplate, *dtp;
750 if ((cnp->cn_flags & CNP_HASBUF) == 0)
751 panic("ufs_mkdir: no name");
754 if ((nlink_t)dp->i_nlink >= LINK_MAX) {
758 dmode = vap->va_mode & 0777;
761 * Must simulate part of ext2_makeinode here to acquire the inode,
762 * but not have it entered in the parent directory. The entry is
763 * made later after writing "." and ".." entries.
765 error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp);
769 ip->i_gid = dp->i_gid;
773 struct ucred ucred, *ucp;
777 * if we are hacking owners here, (only do this where told to)
778 * and we are not giving it TOO root, (would subvert quotas)
779 * then go ahead and give it to the other user.
780 * The new directory also inherits the SUID bit.
781 * If user's UID and dir UID are the same,
782 * 'give it away' so that the SUID is still forced on.
784 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
785 (dp->i_mode & ISUID) && dp->i_uid) {
787 ip->i_uid = dp->i_uid;
789 if (dp->i_uid != cnp->cn_cred->cr_uid) {
791 * make sure the correct user gets charged
793 * Make a dummy credential for the victim.
794 * XXX This seems to never be accessed out of
795 * our context so a stack variable is ok.
798 ucred.cr_uid = ip->i_uid;
799 ucred.cr_ngroups = 1;
800 ucred.cr_groups[0] = dp->i_gid;
805 ip->i_uid = cnp->cn_cred->cr_uid;
808 if ((error = getinoquota(ip)) ||
809 (error = chkiq(ip, 1, ucp, 0))) {
810 UFS_VFREE(tvp, ip->i_number, dmode);
817 ip->i_uid = cnp->cn_cred->cr_uid;
819 if ((error = getinoquota(ip)) ||
820 (error = chkiq(ip, 1, cnp->cn_cred, 0))) {
821 UFS_VFREE(tvp, ip->i_number, dmode);
827 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
829 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
831 if (cnp->cn_flags & CNP_ISWHITEOUT)
832 ip->i_flags |= UF_OPAQUE;
833 error = UFS_UPDATE(tvp, 1);
836 * Bump link count in parent directory
837 * to reflect work done below. Should
838 * be done before reference is created
839 * so reparation is possible if we crash.
842 dp->i_flag |= IN_CHANGE;
843 error = UFS_UPDATE(dvp, 1);
847 /* Initialize directory with "." and ".." from static template. */
848 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs->s_es,
849 EXT2_FEATURE_INCOMPAT_FILETYPE))
850 dtp = &mastertemplate;
852 dtp = &omastertemplate;
854 dirtemplate.dot_ino = ip->i_number;
855 dirtemplate.dotdot_ino = dp->i_number;
856 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE
857 * so let's just redefine it - for this function only
860 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->s_blocksize
861 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
862 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
863 sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE,
864 IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (int *)0, NULL);
867 dp->i_flag |= IN_CHANGE;
870 if (DIRBLKSIZ > VFSTOUFS(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
871 panic("ufs_mkdir: blksize"); /* XXX should grow with balloc() */
873 ip->i_size = DIRBLKSIZ;
874 ip->i_flag |= IN_CHANGE;
877 /* Directory set up, now install its entry in the parent directory. */
878 error = ext2_direnter(ip, dvp, cnp);
881 dp->i_flag |= IN_CHANGE;
885 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
886 * for us because we set the link count to 0.
890 ip->i_flag |= IN_CHANGE;
897 #define DIRBLKSIZ DEV_BSIZE
903 * ext2_rmdir(struct vnode *a_dvp, struct vnode *a_vp,
904 * struct componentname *a_cnp)
907 ext2_rmdir(struct vop_rmdir_args *ap)
909 struct vnode *vp = ap->a_vp;
910 struct vnode *dvp = ap->a_dvp;
911 struct componentname *cnp = ap->a_cnp;
912 struct thread *td = cnp->cn_td;
913 struct inode *ip, *dp;
920 * Verify the directory is empty (and valid).
921 * (Rmdir ".." won't be valid since
922 * ".." will contain a reference to
923 * the current directory and thus be
927 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
931 if ((dp->i_flags & APPEND)
932 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
937 * Delete reference to directory before purging
938 * inode. If we crash in between, the directory
939 * will be reattached to lost+found,
941 error = ext2_dirremove(dvp, cnp);
945 dp->i_flag |= IN_CHANGE;
947 VOP_UNLOCK(dvp, NULL, 0, td);
949 * Truncate inode. The only stuff left
950 * in the directory is "." and "..". The
951 * "." reference is inconsequential since
952 * we're quashing it. The ".." reference
953 * has already been adjusted above. We've
954 * removed the "." reference and the reference
955 * in the parent directory, but there may be
956 * other hard links so decrement by 2 and
957 * worry about them later.
960 error = UFS_TRUNCATE(vp, (off_t)0, IO_SYNC, cnp->cn_cred, td);
961 cache_purge(ITOV(ip));
962 vn_lock(dvp, NULL, LK_EXCLUSIVE | LK_RETRY, td);
968 * symlink -- make a symbolic link
970 * ext2_symlink(struct vnode *a_dvp, struct vnode **a_vpp,
971 * struct componentname *a_cnp, struct vattr *a_vap,
975 ext2_symlink(struct vop_symlink_args *ap)
977 struct vnode *vp, **vpp = ap->a_vpp;
981 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
986 len = strlen(ap->a_target);
987 if (len < vp->v_mount->mnt_maxsymlinklen) {
989 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
991 ip->i_flag |= IN_CHANGE | IN_UPDATE;
993 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
994 UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, (int *)0,
1002 * Allocate a new inode.
1005 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1006 struct componentname *cnp)
1008 struct inode *ip, *pdir;
1014 if ((cnp->cn_flags & CNP_HASBUF) == 0)
1015 panic("ext2_makeinode: no name");
1018 if ((mode & IFMT) == 0)
1021 error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp);
1026 ip->i_gid = pdir->i_gid;
1030 struct ucred ucred, *ucp;
1035 * not the owner of the directory,
1036 * and we are hacking owners here, (only do this where told to)
1037 * and we are not giving it TOO root, (would subvert quotas)
1038 * then go ahead and give it to the other user.
1039 * Note that this drops off the execute bits for security.
1041 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1042 (pdir->i_mode & ISUID) &&
1043 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
1044 ip->i_uid = pdir->i_uid;
1048 * make sure the correct user gets charged
1050 * Quickly knock up a dummy credential for the victim.
1051 * XXX This seems to never be accessed out of our
1052 * context so a stack variable is ok.
1055 ucred.cr_uid = ip->i_uid;
1056 ucred.cr_ngroups = 1;
1057 ucred.cr_groups[0] = pdir->i_gid;
1061 ip->i_uid = cnp->cn_cred->cr_uid;
1065 if ((error = getinoquota(ip)) ||
1066 (error = chkiq(ip, 1, ucp, 0))) {
1067 UFS_VFREE(tvp, ip->i_number, mode);
1074 ip->i_uid = cnp->cn_cred->cr_uid;
1076 if ((error = getinoquota(ip)) ||
1077 (error = chkiq(ip, 1, cnp->cn_cred, 0))) {
1078 UFS_VFREE(tvp, ip->i_number, mode);
1084 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1086 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1088 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) &&
1089 suser_cred(cnp->cn_cred, PRISON_ROOT))
1090 ip->i_mode &= ~ISGID;
1092 if (cnp->cn_flags & CNP_ISWHITEOUT)
1093 ip->i_flags |= UF_OPAQUE;
1096 * Make sure inode goes to disk before directory entry.
1098 error = UFS_UPDATE(tvp, 1);
1101 error = ext2_direnter(ip, dvp, cnp);
1110 * Write error occurred trying to update the inode
1111 * or the directory so must deallocate the inode.
1114 ip->i_flag |= IN_CHANGE;
1122 * XXX By default, wimp out... note that a_offset is ignored (and always
1126 ext2_getpages(struct vop_getpages_args *ap)
1128 return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
1135 * XXX By default, wimp out... note that a_offset is ignored (and always
1139 ext2_putpages(struct vop_putpages_args *ap)
1141 return (vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
1142 ap->a_sync, ap->a_rtvals));