43 */
44
45#include "opt_suiddir.h"
46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/kernel.h>
50#include <sys/fcntl.h>
51#include <sys/filio.h>
52#include <sys/stat.h>
53#include <sys/bio.h>
54#include <sys/buf.h>
55#include <sys/endian.h>
56#include <sys/priv.h>
57#include <sys/mount.h>
58#include <sys/unistd.h>
59#include <sys/time.h>
60#include <sys/vnode.h>
61#include <sys/namei.h>
62#include <sys/lockf.h>
63#include <sys/event.h>
64#include <sys/conf.h>
65#include <sys/file.h>
66
67#include <vm/vm.h>
68#include <vm/vm_page.h>
69#include <vm/vm_object.h>
70#include <vm/vm_extern.h>
71#include <vm/vnode_pager.h>
72
73#include "opt_directio.h"
74
75#include <ufs/ufs/dir.h>
76
77#include <fs/ext2fs/fs.h>
78#include <fs/ext2fs/inode.h>
79#include <fs/ext2fs/ext2_extern.h>
80#include <fs/ext2fs/ext2fs.h>
81#include <fs/ext2fs/ext2_dinode.h>
82#include <fs/ext2fs/ext2_dir.h>
83#include <fs/ext2fs/ext2_mount.h>
84
85static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
86static void ext2_itimes_locked(struct vnode *);
87static int ext4_ext_read(struct vop_read_args *);
88static int ext2_ind_read(struct vop_read_args *);
89
90static vop_access_t ext2_access;
91static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
92static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
93 struct thread *);
94static vop_close_t ext2_close;
95static vop_create_t ext2_create;
96static vop_fsync_t ext2_fsync;
97static vop_getattr_t ext2_getattr;
98static vop_ioctl_t ext2_ioctl;
99static vop_link_t ext2_link;
100static vop_mkdir_t ext2_mkdir;
101static vop_mknod_t ext2_mknod;
102static vop_open_t ext2_open;
103static vop_pathconf_t ext2_pathconf;
104static vop_print_t ext2_print;
105static vop_read_t ext2_read;
106static vop_readlink_t ext2_readlink;
107static vop_remove_t ext2_remove;
108static vop_rename_t ext2_rename;
109static vop_rmdir_t ext2_rmdir;
110static vop_setattr_t ext2_setattr;
111static vop_strategy_t ext2_strategy;
112static vop_symlink_t ext2_symlink;
113static vop_write_t ext2_write;
114static vop_vptofh_t ext2_vptofh;
115static vop_close_t ext2fifo_close;
116static vop_kqfilter_t ext2fifo_kqfilter;
117
118/* Global vfs data structures for ext2. */
119struct vop_vector ext2_vnodeops = {
120 .vop_default = &default_vnodeops,
121 .vop_access = ext2_access,
122 .vop_bmap = ext2_bmap,
123 .vop_cachedlookup = ext2_lookup,
124 .vop_close = ext2_close,
125 .vop_create = ext2_create,
126 .vop_fsync = ext2_fsync,
127 .vop_getattr = ext2_getattr,
128 .vop_inactive = ext2_inactive,
129 .vop_ioctl = ext2_ioctl,
130 .vop_link = ext2_link,
131 .vop_lookup = vfs_cache_lookup,
132 .vop_mkdir = ext2_mkdir,
133 .vop_mknod = ext2_mknod,
134 .vop_open = ext2_open,
135 .vop_pathconf = ext2_pathconf,
136 .vop_poll = vop_stdpoll,
137 .vop_print = ext2_print,
138 .vop_read = ext2_read,
139 .vop_readdir = ext2_readdir,
140 .vop_readlink = ext2_readlink,
141 .vop_reallocblks = ext2_reallocblks,
142 .vop_reclaim = ext2_reclaim,
143 .vop_remove = ext2_remove,
144 .vop_rename = ext2_rename,
145 .vop_rmdir = ext2_rmdir,
146 .vop_setattr = ext2_setattr,
147 .vop_strategy = ext2_strategy,
148 .vop_symlink = ext2_symlink,
149 .vop_write = ext2_write,
150 .vop_vptofh = ext2_vptofh,
151};
152
153struct vop_vector ext2_fifoops = {
154 .vop_default = &fifo_specops,
155 .vop_access = ext2_access,
156 .vop_close = ext2fifo_close,
157 .vop_fsync = ext2_fsync,
158 .vop_getattr = ext2_getattr,
159 .vop_inactive = ext2_inactive,
160 .vop_kqfilter = ext2fifo_kqfilter,
161 .vop_print = ext2_print,
162 .vop_read = VOP_PANIC,
163 .vop_reclaim = ext2_reclaim,
164 .vop_setattr = ext2_setattr,
165 .vop_write = VOP_PANIC,
166 .vop_vptofh = ext2_vptofh,
167};
168
169/*
170 * A virgin directory (no blushing please).
171 * Note that the type and namlen fields are reversed relative to ext2.
172 * Also, we don't use `struct odirtemplate', since it would just cause
173 * endianness problems.
174 */
175static struct dirtemplate mastertemplate = {
176 0, 12, 1, EXT2_FT_DIR, ".",
177 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
178};
179static struct dirtemplate omastertemplate = {
180 0, 12, 1, EXT2_FT_UNKNOWN, ".",
181 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
182};
183
184static void
185ext2_itimes_locked(struct vnode *vp)
186{
187 struct inode *ip;
188 struct timespec ts;
189
190 ASSERT_VI_LOCKED(vp, __func__);
191
192 ip = VTOI(vp);
193 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
194 return;
195 if ((vp->v_type == VBLK || vp->v_type == VCHR))
196 ip->i_flag |= IN_LAZYMOD;
197 else
198 ip->i_flag |= IN_MODIFIED;
199 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
200 vfs_timestamp(&ts);
201 if (ip->i_flag & IN_ACCESS) {
202 ip->i_atime = ts.tv_sec;
203 ip->i_atimensec = ts.tv_nsec;
204 }
205 if (ip->i_flag & IN_UPDATE) {
206 ip->i_mtime = ts.tv_sec;
207 ip->i_mtimensec = ts.tv_nsec;
208 ip->i_modrev++;
209 }
210 if (ip->i_flag & IN_CHANGE) {
211 ip->i_ctime = ts.tv_sec;
212 ip->i_ctimensec = ts.tv_nsec;
213 }
214 }
215 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
216}
217
218void
219ext2_itimes(struct vnode *vp)
220{
221
222 VI_LOCK(vp);
223 ext2_itimes_locked(vp);
224 VI_UNLOCK(vp);
225}
226
227/*
228 * Create a regular file
229 */
230static int
231ext2_create(struct vop_create_args *ap)
232{
233 int error;
234
235 error =
236 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
237 ap->a_dvp, ap->a_vpp, ap->a_cnp);
238 if (error)
239 return (error);
240 return (0);
241}
242
243static int
244ext2_open(struct vop_open_args *ap)
245{
246
247 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
248 return (EOPNOTSUPP);
249
250 /*
251 * Files marked append-only must be opened for appending.
252 */
253 if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
254 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
255 return (EPERM);
256
257 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
258
259 return (0);
260}
261
262/*
263 * Close called.
264 *
265 * Update the times on the inode.
266 */
267static int
268ext2_close(struct vop_close_args *ap)
269{
270 struct vnode *vp = ap->a_vp;
271
272 VI_LOCK(vp);
273 if (vp->v_usecount > 1)
274 ext2_itimes_locked(vp);
275 VI_UNLOCK(vp);
276 return (0);
277}
278
279static int
280ext2_access(struct vop_access_args *ap)
281{
282 struct vnode *vp = ap->a_vp;
283 struct inode *ip = VTOI(vp);
284 accmode_t accmode = ap->a_accmode;
285 int error;
286
287 if (vp->v_type == VBLK || vp->v_type == VCHR)
288 return (EOPNOTSUPP);
289
290 /*
291 * Disallow write attempts on read-only file systems;
292 * unless the file is a socket, fifo, or a block or
293 * character device resident on the file system.
294 */
295 if (accmode & VWRITE) {
296 switch (vp->v_type) {
297 case VDIR:
298 case VLNK:
299 case VREG:
300 if (vp->v_mount->mnt_flag & MNT_RDONLY)
301 return (EROFS);
302 break;
303 default:
304 break;
305 }
306 }
307
308 /* If immutable bit set, nobody gets to write it. */
309 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT)))
310 return (EPERM);
311
312 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
313 ap->a_accmode, ap->a_cred, NULL);
314 return (error);
315}
316
317static int
318ext2_getattr(struct vop_getattr_args *ap)
319{
320 struct vnode *vp = ap->a_vp;
321 struct inode *ip = VTOI(vp);
322 struct vattr *vap = ap->a_vap;
323
324 ext2_itimes(vp);
325 /*
326 * Copy from inode table
327 */
328 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
329 vap->va_fileid = ip->i_number;
330 vap->va_mode = ip->i_mode & ~IFMT;
331 vap->va_nlink = ip->i_nlink;
332 vap->va_uid = ip->i_uid;
333 vap->va_gid = ip->i_gid;
334 vap->va_rdev = ip->i_rdev;
335 vap->va_size = ip->i_size;
336 vap->va_atime.tv_sec = ip->i_atime;
337 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
338 vap->va_mtime.tv_sec = ip->i_mtime;
339 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
340 vap->va_ctime.tv_sec = ip->i_ctime;
341 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
342 if E2DI_HAS_XTIME(ip) {
343 vap->va_birthtime.tv_sec = ip->i_birthtime;
344 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
345 }
346 vap->va_flags = ip->i_flags;
347 vap->va_gen = ip->i_gen;
348 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
349 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
350 vap->va_type = IFTOVT(ip->i_mode);
351 vap->va_filerev = ip->i_modrev;
352 return (0);
353}
354
355/*
356 * Set attribute vnode op. called from several syscalls
357 */
358static int
359ext2_setattr(struct vop_setattr_args *ap)
360{
361 struct vattr *vap = ap->a_vap;
362 struct vnode *vp = ap->a_vp;
363 struct inode *ip = VTOI(vp);
364 struct ucred *cred = ap->a_cred;
365 struct thread *td = curthread;
366 int error;
367
368 /*
369 * Check for unsettable attributes.
370 */
371 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
372 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
373 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
374 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
375 return (EINVAL);
376 }
377 if (vap->va_flags != VNOVAL) {
378 /* Disallow flags not supported by ext2fs. */
379 if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
380 return (EOPNOTSUPP);
381
382 if (vp->v_mount->mnt_flag & MNT_RDONLY)
383 return (EROFS);
384 /*
385 * Callers may only modify the file flags on objects they
386 * have VADMIN rights for.
387 */
388 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
389 return (error);
390 /*
391 * Unprivileged processes and privileged processes in
392 * jail() are not permitted to unset system flags, or
393 * modify flags if any system flags are set.
394 * Privileged non-jail processes may not modify system flags
395 * if securelevel > 0 and any existing system flags are set.
396 */
397 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
398 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
399 error = securelevel_gt(cred, 0);
400 if (error)
401 return (error);
402 }
403 } else {
404 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
405 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
406 return (EPERM);
407 }
408 ip->i_flags = vap->va_flags;
409 ip->i_flag |= IN_CHANGE;
410 if (ip->i_flags & (IMMUTABLE | APPEND))
411 return (0);
412 }
413 if (ip->i_flags & (IMMUTABLE | APPEND))
414 return (EPERM);
415 /*
416 * Go through the fields and update iff not VNOVAL.
417 */
418 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
419 if (vp->v_mount->mnt_flag & MNT_RDONLY)
420 return (EROFS);
421 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
422 td)) != 0)
423 return (error);
424 }
425 if (vap->va_size != VNOVAL) {
426 /*
427 * Disallow write attempts on read-only file systems;
428 * unless the file is a socket, fifo, or a block or
429 * character device resident on the file system.
430 */
431 switch (vp->v_type) {
432 case VDIR:
433 return (EISDIR);
434 case VLNK:
435 case VREG:
436 if (vp->v_mount->mnt_flag & MNT_RDONLY)
437 return (EROFS);
438 break;
439 default:
440 break;
441 }
442 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
443 return (error);
444 }
445 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
446 if (vp->v_mount->mnt_flag & MNT_RDONLY)
447 return (EROFS);
448 /*
449 * From utimes(2):
450 * If times is NULL, ... The caller must be the owner of
451 * the file, have permission to write the file, or be the
452 * super-user.
453 * If times is non-NULL, ... The caller must be the owner of
454 * the file or be the super-user.
455 */
456 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
457 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
458 (error = VOP_ACCESS(vp, VWRITE, cred, td))))
459 return (error);
460 if (vap->va_atime.tv_sec != VNOVAL)
461 ip->i_flag |= IN_ACCESS;
462 if (vap->va_mtime.tv_sec != VNOVAL)
463 ip->i_flag |= IN_CHANGE | IN_UPDATE;
464 ext2_itimes(vp);
465 if (vap->va_atime.tv_sec != VNOVAL) {
466 ip->i_atime = vap->va_atime.tv_sec;
467 ip->i_atimensec = vap->va_atime.tv_nsec;
468 }
469 if (vap->va_mtime.tv_sec != VNOVAL) {
470 ip->i_mtime = vap->va_mtime.tv_sec;
471 ip->i_mtimensec = vap->va_mtime.tv_nsec;
472 }
473 ip->i_birthtime = vap->va_birthtime.tv_sec;
474 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
475 error = ext2_update(vp, 0);
476 if (error)
477 return (error);
478 }
479 error = 0;
480 if (vap->va_mode != (mode_t)VNOVAL) {
481 if (vp->v_mount->mnt_flag & MNT_RDONLY)
482 return (EROFS);
483 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
484 }
485 return (error);
486}
487
488/*
489 * Change the mode on a file.
490 * Inode must be locked before calling.
491 */
492static int
493ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
494{
495 struct inode *ip = VTOI(vp);
496 int error;
497
498 /*
499 * To modify the permissions on a file, must possess VADMIN
500 * for that file.
501 */
502 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
503 return (error);
504 /*
505 * Privileged processes may set the sticky bit on non-directories,
506 * as well as set the setgid bit on a file with a group that the
507 * process is not a member of.
508 */
509 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
510 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0);
511 if (error)
512 return (EFTYPE);
513 }
514 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
515 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
516 if (error)
517 return (error);
518 }
519 ip->i_mode &= ~ALLPERMS;
520 ip->i_mode |= (mode & ALLPERMS);
521 ip->i_flag |= IN_CHANGE;
522 return (0);
523}
524
525/*
526 * Perform chown operation on inode ip;
527 * inode must be locked prior to call.
528 */
529static int
530ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
531 struct thread *td)
532{
533 struct inode *ip = VTOI(vp);
534 uid_t ouid;
535 gid_t ogid;
536 int error = 0;
537
538 if (uid == (uid_t)VNOVAL)
539 uid = ip->i_uid;
540 if (gid == (gid_t)VNOVAL)
541 gid = ip->i_gid;
542 /*
543 * To modify the ownership of a file, must possess VADMIN
544 * for that file.
545 */
546 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
547 return (error);
548 /*
549 * To change the owner of a file, or change the group of a file
550 * to a group of which we are not a member, the caller must
551 * have privilege.
552 */
553 if (uid != ip->i_uid || (gid != ip->i_gid &&
554 !groupmember(gid, cred))) {
555 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
556 if (error)
557 return (error);
558 }
559 ogid = ip->i_gid;
560 ouid = ip->i_uid;
561 ip->i_gid = gid;
562 ip->i_uid = uid;
563 ip->i_flag |= IN_CHANGE;
564 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
565 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0)
566 ip->i_mode &= ~(ISUID | ISGID);
567 }
568 return (0);
569}
570
571/*
572 * Synch an open file.
573 */
574/* ARGSUSED */
575static int
576ext2_fsync(struct vop_fsync_args *ap)
577{
578 /*
579 * Flush all dirty buffers associated with a vnode.
580 */
581
582 vop_stdfsync(ap);
583
584 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
585}
586
587/*
588 * Mknod vnode call
589 */
590/* ARGSUSED */
591static int
592ext2_mknod(struct vop_mknod_args *ap)
593{
594 struct vattr *vap = ap->a_vap;
595 struct vnode **vpp = ap->a_vpp;
596 struct inode *ip;
597 ino_t ino;
598 int error;
599
600 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
601 ap->a_dvp, vpp, ap->a_cnp);
602 if (error)
603 return (error);
604 ip = VTOI(*vpp);
605 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
606 if (vap->va_rdev != VNOVAL) {
607 /*
608 * Want to be able to use this to make badblock
609 * inodes, so don't truncate the dev number.
610 */
611 ip->i_rdev = vap->va_rdev;
612 }
613 /*
614 * Remove inode, then reload it through VFS_VGET so it is
615 * checked to see if it is an alias of an existing entry in
616 * the inode cache. XXX I don't believe this is necessary now.
617 */
618 (*vpp)->v_type = VNON;
619 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
620 vgone(*vpp);
621 vput(*vpp);
622 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
623 if (error) {
624 *vpp = NULL;
625 return (error);
626 }
627 return (0);
628}
629
630static int
631ext2_remove(struct vop_remove_args *ap)
632{
633 struct inode *ip;
634 struct vnode *vp = ap->a_vp;
635 struct vnode *dvp = ap->a_dvp;
636 int error;
637
638 ip = VTOI(vp);
639 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
640 (VTOI(dvp)->i_flags & APPEND)) {
641 error = EPERM;
642 goto out;
643 }
644 error = ext2_dirremove(dvp, ap->a_cnp);
645 if (error == 0) {
646 ip->i_nlink--;
647 ip->i_flag |= IN_CHANGE;
648 }
649out:
650 return (error);
651}
652
653/*
654 * link vnode call
655 */
656static int
657ext2_link(struct vop_link_args *ap)
658{
659 struct vnode *vp = ap->a_vp;
660 struct vnode *tdvp = ap->a_tdvp;
661 struct componentname *cnp = ap->a_cnp;
662 struct inode *ip;
663 int error;
664
665#ifdef INVARIANTS
666 if ((cnp->cn_flags & HASBUF) == 0)
667 panic("ext2_link: no name");
668#endif
669 if (tdvp->v_mount != vp->v_mount) {
670 error = EXDEV;
671 goto out;
672 }
673 ip = VTOI(vp);
674 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) {
675 error = EMLINK;
676 goto out;
677 }
678 if (ip->i_flags & (IMMUTABLE | APPEND)) {
679 error = EPERM;
680 goto out;
681 }
682 ip->i_nlink++;
683 ip->i_flag |= IN_CHANGE;
684 error = ext2_update(vp, !DOINGASYNC(vp));
685 if (!error)
686 error = ext2_direnter(ip, tdvp, cnp);
687 if (error) {
688 ip->i_nlink--;
689 ip->i_flag |= IN_CHANGE;
690 }
691out:
692 return (error);
693}
694
695/*
696 * Rename system call.
697 * rename("foo", "bar");
698 * is essentially
699 * unlink("bar");
700 * link("foo", "bar");
701 * unlink("foo");
702 * but ``atomically''. Can't do full commit without saving state in the
703 * inode on disk which isn't feasible at this time. Best we can do is
704 * always guarantee the target exists.
705 *
706 * Basic algorithm is:
707 *
708 * 1) Bump link count on source while we're linking it to the
709 * target. This also ensure the inode won't be deleted out
710 * from underneath us while we work (it may be truncated by
711 * a concurrent `trunc' or `open' for creation).
712 * 2) Link source to destination. If destination already exists,
713 * delete it first.
714 * 3) Unlink source reference to inode if still around. If a
715 * directory was moved and the parent of the destination
716 * is different from the source, patch the ".." entry in the
717 * directory.
718 */
719static int
720ext2_rename(struct vop_rename_args *ap)
721{
722 struct vnode *tvp = ap->a_tvp;
723 struct vnode *tdvp = ap->a_tdvp;
724 struct vnode *fvp = ap->a_fvp;
725 struct vnode *fdvp = ap->a_fdvp;
726 struct componentname *tcnp = ap->a_tcnp;
727 struct componentname *fcnp = ap->a_fcnp;
728 struct inode *ip, *xp, *dp;
729 struct dirtemplate dirbuf;
730 int doingdirectory = 0, oldparent = 0, newparent = 0;
731 int error = 0;
732 u_char namlen;
733
734#ifdef INVARIANTS
735 if ((tcnp->cn_flags & HASBUF) == 0 ||
736 (fcnp->cn_flags & HASBUF) == 0)
737 panic("ext2_rename: no name");
738#endif
739 /*
740 * Check for cross-device rename.
741 */
742 if ((fvp->v_mount != tdvp->v_mount) ||
743 (tvp && (fvp->v_mount != tvp->v_mount))) {
744 error = EXDEV;
745abortit:
746 if (tdvp == tvp)
747 vrele(tdvp);
748 else
749 vput(tdvp);
750 if (tvp)
751 vput(tvp);
752 vrele(fdvp);
753 vrele(fvp);
754 return (error);
755 }
756
757 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
758 (VTOI(tdvp)->i_flags & APPEND))) {
759 error = EPERM;
760 goto abortit;
761 }
762
763 /*
764 * Renaming a file to itself has no effect. The upper layers should
765 * not call us in that case. Temporarily just warn if they do.
766 */
767 if (fvp == tvp) {
768 printf("ext2_rename: fvp == tvp (can't happen)\n");
769 error = 0;
770 goto abortit;
771 }
772
773 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
774 goto abortit;
775 dp = VTOI(fdvp);
776 ip = VTOI(fvp);
777 if (ip->i_nlink >= EXT2_LINK_MAX) {
778 VOP_UNLOCK(fvp, 0);
779 error = EMLINK;
780 goto abortit;
781 }
782 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
783 || (dp->i_flags & APPEND)) {
784 VOP_UNLOCK(fvp, 0);
785 error = EPERM;
786 goto abortit;
787 }
788 if ((ip->i_mode & IFMT) == IFDIR) {
789 /*
790 * Avoid ".", "..", and aliases of "." for obvious reasons.
791 */
792 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
793 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
794 (ip->i_flag & IN_RENAME)) {
795 VOP_UNLOCK(fvp, 0);
796 error = EINVAL;
797 goto abortit;
798 }
799 ip->i_flag |= IN_RENAME;
800 oldparent = dp->i_number;
801 doingdirectory++;
802 }
803 vrele(fdvp);
804
805 /*
806 * When the target exists, both the directory
807 * and target vnodes are returned locked.
808 */
809 dp = VTOI(tdvp);
810 xp = NULL;
811 if (tvp)
812 xp = VTOI(tvp);
813
814 /*
815 * 1) Bump link count while we're moving stuff
816 * around. If we crash somewhere before
817 * completing our work, the link count
818 * may be wrong, but correctable.
819 */
820 ip->i_nlink++;
821 ip->i_flag |= IN_CHANGE;
822 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
823 VOP_UNLOCK(fvp, 0);
824 goto bad;
825 }
826
827 /*
828 * If ".." must be changed (ie the directory gets a new
829 * parent) then the source directory must not be in the
830 * directory hierarchy above the target, as this would
831 * orphan everything below the source directory. Also
832 * the user must have write permission in the source so
833 * as to be able to change "..". We must repeat the call
834 * to namei, as the parent directory is unlocked by the
835 * call to checkpath().
836 */
837 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
838 VOP_UNLOCK(fvp, 0);
839 if (oldparent != dp->i_number)
840 newparent = dp->i_number;
841 if (doingdirectory && newparent) {
842 if (error) /* write access check above */
843 goto bad;
844 if (xp != NULL)
845 vput(tvp);
846 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
847 if (error)
848 goto out;
849 VREF(tdvp);
850 error = relookup(tdvp, &tvp, tcnp);
851 if (error)
852 goto out;
853 vrele(tdvp);
854 dp = VTOI(tdvp);
855 xp = NULL;
856 if (tvp)
857 xp = VTOI(tvp);
858 }
859 /*
860 * 2) If target doesn't exist, link the target
861 * to the source and unlink the source.
862 * Otherwise, rewrite the target directory
863 * entry to reference the source inode and
864 * expunge the original entry's existence.
865 */
866 if (xp == NULL) {
867 if (dp->i_devvp != ip->i_devvp)
868 panic("ext2_rename: EXDEV");
869 /*
870 * Account for ".." in new directory.
871 * When source and destination have the same
872 * parent we don't fool with the link count.
873 */
874 if (doingdirectory && newparent) {
875 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) {
876 error = EMLINK;
877 goto bad;
878 }
879 dp->i_nlink++;
880 dp->i_flag |= IN_CHANGE;
881 error = ext2_update(tdvp, !DOINGASYNC(tdvp));
882 if (error)
883 goto bad;
884 }
885 error = ext2_direnter(ip, tdvp, tcnp);
886 if (error) {
887 if (doingdirectory && newparent) {
888 dp->i_nlink--;
889 dp->i_flag |= IN_CHANGE;
890 (void)ext2_update(tdvp, 1);
891 }
892 goto bad;
893 }
894 vput(tdvp);
895 } else {
896 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
897 panic("ext2_rename: EXDEV");
898 /*
899 * Short circuit rename(foo, foo).
900 */
901 if (xp->i_number == ip->i_number)
902 panic("ext2_rename: same file");
903 /*
904 * If the parent directory is "sticky", then the user must
905 * own the parent directory, or the destination of the rename,
906 * otherwise the destination may not be changed (except by
907 * root). This implements append-only directories.
908 */
909 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
910 tcnp->cn_cred->cr_uid != dp->i_uid &&
911 xp->i_uid != tcnp->cn_cred->cr_uid) {
912 error = EPERM;
913 goto bad;
914 }
915 /*
916 * Target must be empty if a directory and have no links
917 * to it. Also, ensure source and target are compatible
918 * (both directories, or both not directories).
919 */
920 if ((xp->i_mode&IFMT) == IFDIR) {
921 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
922 xp->i_nlink > 2) {
923 error = ENOTEMPTY;
924 goto bad;
925 }
926 if (!doingdirectory) {
927 error = ENOTDIR;
928 goto bad;
929 }
930 cache_purge(tdvp);
931 } else if (doingdirectory) {
932 error = EISDIR;
933 goto bad;
934 }
935 error = ext2_dirrewrite(dp, ip, tcnp);
936 if (error)
937 goto bad;
938 /*
939 * If the target directory is in the same
940 * directory as the source directory,
941 * decrement the link count on the parent
942 * of the target directory.
943 */
944 if (doingdirectory && !newparent) {
945 dp->i_nlink--;
946 dp->i_flag |= IN_CHANGE;
947 }
948 vput(tdvp);
949 /*
950 * Adjust the link count of the target to
951 * reflect the dirrewrite above. If this is
952 * a directory it is empty and there are
953 * no links to it, so we can squash the inode and
954 * any space associated with it. We disallowed
955 * renaming over top of a directory with links to
956 * it above, as the remaining link would point to
957 * a directory without "." or ".." entries.
958 */
959 xp->i_nlink--;
960 if (doingdirectory) {
961 if (--xp->i_nlink != 0)
962 panic("ext2_rename: linked directory");
963 error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
964 tcnp->cn_cred, tcnp->cn_thread);
965 }
966 xp->i_flag |= IN_CHANGE;
967 vput(tvp);
968 xp = NULL;
969 }
970
971 /*
972 * 3) Unlink the source.
973 */
974 fcnp->cn_flags &= ~MODMASK;
975 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
976 VREF(fdvp);
977 error = relookup(fdvp, &fvp, fcnp);
978 if (error == 0)
979 vrele(fdvp);
980 if (fvp != NULL) {
981 xp = VTOI(fvp);
982 dp = VTOI(fdvp);
983 } else {
984 /*
985 * From name has disappeared.
986 */
987 if (doingdirectory)
988 panic("ext2_rename: lost dir entry");
989 vrele(ap->a_fvp);
990 return (0);
991 }
992 /*
993 * Ensure that the directory entry still exists and has not
994 * changed while the new name has been entered. If the source is
995 * a file then the entry may have been unlinked or renamed. In
996 * either case there is no further work to be done. If the source
997 * is a directory then it cannot have been rmdir'ed; its link
998 * count of three would cause a rmdir to fail with ENOTEMPTY.
999 * The IN_RENAME flag ensures that it cannot be moved by another
1000 * rename.
1001 */
1002 if (xp != ip) {
1003 if (doingdirectory)
1004 panic("ext2_rename: lost dir entry");
1005 } else {
1006 /*
1007 * If the source is a directory with a
1008 * new parent, the link count of the old
1009 * parent directory must be decremented
1010 * and ".." set to point to the new parent.
1011 */
1012 if (doingdirectory && newparent) {
1013 dp->i_nlink--;
1014 dp->i_flag |= IN_CHANGE;
1015 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
1016 sizeof(struct dirtemplate), (off_t)0,
1017 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1018 tcnp->cn_cred, NOCRED, NULL, NULL);
1019 if (error == 0) {
1020 /* Like ufs little-endian: */
1021 namlen = dirbuf.dotdot_type;
1022 if (namlen != 2 ||
1023 dirbuf.dotdot_name[0] != '.' ||
1024 dirbuf.dotdot_name[1] != '.') {
1025 ext2_dirbad(xp, (doff_t)12,
1026 "rename: mangled dir");
1027 } else {
1028 dirbuf.dotdot_ino = newparent;
1029 (void) vn_rdwr(UIO_WRITE, fvp,
1030 (caddr_t)&dirbuf,
1031 sizeof(struct dirtemplate),
1032 (off_t)0, UIO_SYSSPACE,
1033 IO_NODELOCKED | IO_SYNC |
1034 IO_NOMACCHECK, tcnp->cn_cred,
1035 NOCRED, NULL, NULL);
1036 cache_purge(fdvp);
1037 }
1038 }
1039 }
1040 error = ext2_dirremove(fdvp, fcnp);
1041 if (!error) {
1042 xp->i_nlink--;
1043 xp->i_flag |= IN_CHANGE;
1044 }
1045 xp->i_flag &= ~IN_RENAME;
1046 }
1047 if (dp)
1048 vput(fdvp);
1049 if (xp)
1050 vput(fvp);
1051 vrele(ap->a_fvp);
1052 return (error);
1053
1054bad:
1055 if (xp)
1056 vput(ITOV(xp));
1057 vput(ITOV(dp));
1058out:
1059 if (doingdirectory)
1060 ip->i_flag &= ~IN_RENAME;
1061 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
1062 ip->i_nlink--;
1063 ip->i_flag |= IN_CHANGE;
1064 ip->i_flag &= ~IN_RENAME;
1065 vput(fvp);
1066 } else
1067 vrele(fvp);
1068 return (error);
1069}
1070
1071/*
1072 * Mkdir system call
1073 */
1074static int
1075ext2_mkdir(struct vop_mkdir_args *ap)
1076{
1077 struct vnode *dvp = ap->a_dvp;
1078 struct vattr *vap = ap->a_vap;
1079 struct componentname *cnp = ap->a_cnp;
1080 struct inode *ip, *dp;
1081 struct vnode *tvp;
1082 struct dirtemplate dirtemplate, *dtp;
1083 int error, dmode;
1084
1085#ifdef INVARIANTS
1086 if ((cnp->cn_flags & HASBUF) == 0)
1087 panic("ext2_mkdir: no name");
1088#endif
1089 dp = VTOI(dvp);
1090 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) {
1091 error = EMLINK;
1092 goto out;
1093 }
1094 dmode = vap->va_mode & 0777;
1095 dmode |= IFDIR;
1096 /*
1097 * Must simulate part of ext2_makeinode here to acquire the inode,
1098 * but not have it entered in the parent directory. The entry is
1099 * made later after writing "." and ".." entries.
1100 */
1101 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
1102 if (error)
1103 goto out;
1104 ip = VTOI(tvp);
1105 ip->i_gid = dp->i_gid;
1106#ifdef SUIDDIR
1107 {
1108 /*
1109 * if we are hacking owners here, (only do this where told to)
1110 * and we are not giving it TOO root, (would subvert quotas)
1111 * then go ahead and give it to the other user.
1112 * The new directory also inherits the SUID bit.
1113 * If user's UID and dir UID are the same,
1114 * 'give it away' so that the SUID is still forced on.
1115 */
1116 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1117 (dp->i_mode & ISUID) && dp->i_uid) {
1118 dmode |= ISUID;
1119 ip->i_uid = dp->i_uid;
1120 } else {
1121 ip->i_uid = cnp->cn_cred->cr_uid;
1122 }
1123 }
1124#else
1125 ip->i_uid = cnp->cn_cred->cr_uid;
1126#endif
1127 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1128 ip->i_mode = dmode;
1129 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1130 ip->i_nlink = 2;
1131 if (cnp->cn_flags & ISWHITEOUT)
1132 ip->i_flags |= UF_OPAQUE;
1133 error = ext2_update(tvp, 1);
1134
1135 /*
1136 * Bump link count in parent directory
1137 * to reflect work done below. Should
1138 * be done before reference is created
1139 * so reparation is possible if we crash.
1140 */
1141 dp->i_nlink++;
1142 dp->i_flag |= IN_CHANGE;
1143 error = ext2_update(dvp, !DOINGASYNC(dvp));
1144 if (error)
1145 goto bad;
1146
1147 /* Initialize directory with "." and ".." from static template. */
1148 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
1149 EXT2F_INCOMPAT_FTYPE))
1150 dtp = &mastertemplate;
1151 else
1152 dtp = &omastertemplate;
1153 dirtemplate = *dtp;
1154 dirtemplate.dot_ino = ip->i_number;
1155 dirtemplate.dotdot_ino = dp->i_number;
1156 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE
1157 * so let's just redefine it - for this function only
1158 */
1159#undef DIRBLKSIZ
1160#define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize
1161 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
1162 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
1163 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE,
1164 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
1165 NULL, NULL);
1166 if (error) {
1167 dp->i_nlink--;
1168 dp->i_flag |= IN_CHANGE;
1169 goto bad;
1170 }
1171 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
1172 /* XXX should grow with balloc() */
1173 panic("ext2_mkdir: blksize");
1174 else {
1175 ip->i_size = DIRBLKSIZ;
1176 ip->i_flag |= IN_CHANGE;
1177 }
1178
1179 /* Directory set up, now install its entry in the parent directory. */
1180 error = ext2_direnter(ip, dvp, cnp);
1181 if (error) {
1182 dp->i_nlink--;
1183 dp->i_flag |= IN_CHANGE;
1184 }
1185bad:
1186 /*
1187 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
1188 * for us because we set the link count to 0.
1189 */
1190 if (error) {
1191 ip->i_nlink = 0;
1192 ip->i_flag |= IN_CHANGE;
1193 vput(tvp);
1194 } else
1195 *ap->a_vpp = tvp;
1196out:
1197 return (error);
1198#undef DIRBLKSIZ
1199#define DIRBLKSIZ DEV_BSIZE
1200}
1201
1202/*
1203 * Rmdir system call.
1204 */
1205static int
1206ext2_rmdir(struct vop_rmdir_args *ap)
1207{
1208 struct vnode *vp = ap->a_vp;
1209 struct vnode *dvp = ap->a_dvp;
1210 struct componentname *cnp = ap->a_cnp;
1211 struct inode *ip, *dp;
1212 int error;
1213
1214 ip = VTOI(vp);
1215 dp = VTOI(dvp);
1216
1217 /*
1218 * Verify the directory is empty (and valid).
1219 * (Rmdir ".." won't be valid since
1220 * ".." will contain a reference to
1221 * the current directory and thus be
1222 * non-empty.)
1223 */
1224 error = 0;
1225 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1226 error = ENOTEMPTY;
1227 goto out;
1228 }
1229 if ((dp->i_flags & APPEND)
1230 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1231 error = EPERM;
1232 goto out;
1233 }
1234 /*
1235 * Delete reference to directory before purging
1236 * inode. If we crash in between, the directory
1237 * will be reattached to lost+found,
1238 */
1239 error = ext2_dirremove(dvp, cnp);
1240 if (error)
1241 goto out;
1242 dp->i_nlink--;
1243 dp->i_flag |= IN_CHANGE;
1244 cache_purge(dvp);
1245 VOP_UNLOCK(dvp, 0);
1246 /*
1247 * Truncate inode. The only stuff left
1248 * in the directory is "." and "..". The
1249 * "." reference is inconsequential since
1250 * we're quashing it. The ".." reference
1251 * has already been adjusted above. We've
1252 * removed the "." reference and the reference
1253 * in the parent directory, but there may be
1254 * other hard links so decrement by 2 and
1255 * worry about them later.
1256 */
1257 ip->i_nlink -= 2;
1258 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
1259 cnp->cn_thread);
1260 cache_purge(ITOV(ip));
1261 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1262 VOP_UNLOCK(vp, 0);
1263 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1264 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1265 }
1266out:
1267 return (error);
1268}
1269
1270/*
1271 * symlink -- make a symbolic link
1272 */
1273static int
1274ext2_symlink(struct vop_symlink_args *ap)
1275{
1276 struct vnode *vp, **vpp = ap->a_vpp;
1277 struct inode *ip;
1278 int len, error;
1279
1280 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1281 vpp, ap->a_cnp);
1282 if (error)
1283 return (error);
1284 vp = *vpp;
1285 len = strlen(ap->a_target);
1286 if (len < vp->v_mount->mnt_maxsymlinklen) {
1287 ip = VTOI(vp);
1288 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
1289 ip->i_size = len;
1290 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1291 } else
1292 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
1293 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1294 ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
1295 if (error)
1296 vput(vp);
1297 return (error);
1298}
1299
1300/*
1301 * Return target name of a symbolic link
1302 */
1303static int
1304ext2_readlink(struct vop_readlink_args *ap)
1305{
1306 struct vnode *vp = ap->a_vp;
1307 struct inode *ip = VTOI(vp);
1308 int isize;
1309
1310 isize = ip->i_size;
1311 if (isize < vp->v_mount->mnt_maxsymlinklen) {
1312 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
1313 return (0);
1314 }
1315 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1316}
1317
1318/*
1319 * Calculate the logical to physical mapping if not done already,
1320 * then call the device strategy routine.
1321 *
1322 * In order to be able to swap to a file, the ext2_bmaparray() operation may not
1323 * deadlock on memory. See ext2_bmap() for details.
1324 */
1325static int
1326ext2_strategy(struct vop_strategy_args *ap)
1327{
1328 struct buf *bp = ap->a_bp;
1329 struct vnode *vp = ap->a_vp;
1330 struct inode *ip;
1331 struct bufobj *bo;
1332 daddr_t blkno;
1333 int error;
1334
1335 ip = VTOI(vp);
1336 if (vp->v_type == VBLK || vp->v_type == VCHR)
1337 panic("ext2_strategy: spec");
1338 if (bp->b_blkno == bp->b_lblkno) {
1339 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
1340 bp->b_blkno = blkno;
1341 if (error) {
1342 bp->b_error = error;
1343 bp->b_ioflags |= BIO_ERROR;
1344 bufdone(bp);
1345 return (0);
1346 }
1347 if ((long)bp->b_blkno == -1)
1348 vfs_bio_clrbuf(bp);
1349 }
1350 if ((long)bp->b_blkno == -1) {
1351 bufdone(bp);
1352 return (0);
1353 }
1354 bp->b_iooffset = dbtob(bp->b_blkno);
1355 bo = VFSTOEXT2(vp->v_mount)->um_bo;
1356 BO_STRATEGY(bo, bp);
1357 return (0);
1358}
1359
1360/*
1361 * Print out the contents of an inode.
1362 */
1363static int
1364ext2_print(struct vop_print_args *ap)
1365{
1366 struct vnode *vp = ap->a_vp;
1367 struct inode *ip = VTOI(vp);
1368
1369 vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number);
1370 if (vp->v_type == VFIFO)
1371 fifo_printinfo(vp);
1372 printf("\n");
1373 return (0);
1374}
1375
1376/*
1377 * Close wrapper for fifos.
1378 *
1379 * Update the times on the inode then do device close.
1380 */
1381static int
1382ext2fifo_close(struct vop_close_args *ap)
1383{
1384 struct vnode *vp = ap->a_vp;
1385
1386 VI_LOCK(vp);
1387 if (vp->v_usecount > 1)
1388 ext2_itimes_locked(vp);
1389 VI_UNLOCK(vp);
1390 return (fifo_specops.vop_close(ap));
1391}
1392
1393/*
1394 * Kqfilter wrapper for fifos.
1395 *
1396 * Fall through to ext2 kqfilter routines if needed
1397 */
1398static int
1399ext2fifo_kqfilter(struct vop_kqfilter_args *ap)
1400{
1401 int error;
1402
1403 error = fifo_specops.vop_kqfilter(ap);
1404 if (error)
1405 error = vfs_kqfilter(ap);
1406 return (error);
1407}
1408
1409/*
1410 * Return POSIX pathconf information applicable to ext2 filesystems.
1411 */
1412static int
1413ext2_pathconf(struct vop_pathconf_args *ap)
1414{
1415 int error = 0;
1416
1417 switch (ap->a_name) {
1418 case _PC_LINK_MAX:
1419 *ap->a_retval = EXT2_LINK_MAX;
1420 break;
1421 case _PC_NAME_MAX:
1422 *ap->a_retval = NAME_MAX;
1423 break;
1424 case _PC_PATH_MAX:
1425 *ap->a_retval = PATH_MAX;
1426 break;
1427 case _PC_PIPE_BUF:
1428 *ap->a_retval = PIPE_BUF;
1429 break;
1430 case _PC_CHOWN_RESTRICTED:
1431 *ap->a_retval = 1;
1432 break;
1433 case _PC_NO_TRUNC:
1434 *ap->a_retval = 1;
1435 break;
1436 case _PC_MIN_HOLE_SIZE:
1437 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1438 break;
1439 case _PC_ASYNC_IO:
1440 /* _PC_ASYNC_IO should have been handled by upper layers. */
1441 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
1442 error = EINVAL;
1443 break;
1444 case _PC_PRIO_IO:
1445 *ap->a_retval = 0;
1446 break;
1447 case _PC_SYNC_IO:
1448 *ap->a_retval = 0;
1449 break;
1450 case _PC_ALLOC_SIZE_MIN:
1451 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
1452 break;
1453 case _PC_FILESIZEBITS:
1454 *ap->a_retval = 64;
1455 break;
1456 case _PC_REC_INCR_XFER_SIZE:
1457 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1458 break;
1459 case _PC_REC_MAX_XFER_SIZE:
1460 *ap->a_retval = -1; /* means ``unlimited'' */
1461 break;
1462 case _PC_REC_MIN_XFER_SIZE:
1463 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1464 break;
1465 case _PC_REC_XFER_ALIGN:
1466 *ap->a_retval = PAGE_SIZE;
1467 break;
1468 case _PC_SYMLINK_MAX:
1469 *ap->a_retval = MAXPATHLEN;
1470 break;
1471
1472 default:
1473 error = EINVAL;
1474 break;
1475 }
1476 return (error);
1477}
1478
1479/*
1480 * Vnode pointer to File handle
1481 */
1482/* ARGSUSED */
1483static int
1484ext2_vptofh(struct vop_vptofh_args *ap)
1485{
1486 struct inode *ip;
1487 struct ufid *ufhp;
1488
1489 ip = VTOI(ap->a_vp);
1490 ufhp = (struct ufid *)ap->a_fhp;
1491 ufhp->ufid_len = sizeof(struct ufid);
1492 ufhp->ufid_ino = ip->i_number;
1493 ufhp->ufid_gen = ip->i_gen;
1494 return (0);
1495}
1496
1497/*
1498 * Initialize the vnode associated with a new inode, handle aliased
1499 * vnodes.
1500 */
1501int
1502ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
1503{
1504 struct inode *ip;
1505 struct vnode *vp;
1506
1507 vp = *vpp;
1508 ip = VTOI(vp);
1509 vp->v_type = IFTOVT(ip->i_mode);
1510 if (vp->v_type == VFIFO)
1511 vp->v_op = fifoops;
1512
1513 if (ip->i_number == EXT2_ROOTINO)
1514 vp->v_vflag |= VV_ROOT;
1515 ip->i_modrev = init_va_filerev();
1516 *vpp = vp;
1517 return (0);
1518}
1519
1520/*
1521 * Allocate a new inode.
1522 */
1523static int
1524ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1525 struct componentname *cnp)
1526{
1527 struct inode *ip, *pdir;
1528 struct vnode *tvp;
1529 int error;
1530
1531 pdir = VTOI(dvp);
1532#ifdef INVARIANTS
1533 if ((cnp->cn_flags & HASBUF) == 0)
1534 panic("ext2_makeinode: no name");
1535#endif
1536 *vpp = NULL;
1537 if ((mode & IFMT) == 0)
1538 mode |= IFREG;
1539
1540 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
1541 if (error) {
1542 return (error);
1543 }
1544 ip = VTOI(tvp);
1545 ip->i_gid = pdir->i_gid;
1546#ifdef SUIDDIR
1547 {
1548 /*
1549 * if we are
1550 * not the owner of the directory,
1551 * and we are hacking owners here, (only do this where told to)
1552 * and we are not giving it TOO root, (would subvert quotas)
1553 * then go ahead and give it to the other user.
1554 * Note that this drops off the execute bits for security.
1555 */
1556 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1557 (pdir->i_mode & ISUID) &&
1558 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
1559 ip->i_uid = pdir->i_uid;
1560 mode &= ~07111;
1561 } else {
1562 ip->i_uid = cnp->cn_cred->cr_uid;
1563 }
1564 }
1565#else
1566 ip->i_uid = cnp->cn_cred->cr_uid;
1567#endif
1568 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1569 ip->i_mode = mode;
1570 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1571 ip->i_nlink = 1;
1572 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
1573 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0))
1574 ip->i_mode &= ~ISGID;
1575 }
1576
1577 if (cnp->cn_flags & ISWHITEOUT)
1578 ip->i_flags |= UF_OPAQUE;
1579
1580 /*
1581 * Make sure inode goes to disk before directory entry.
1582 */
1583 error = ext2_update(tvp, !DOINGASYNC(tvp));
1584 if (error)
1585 goto bad;
1586 error = ext2_direnter(ip, dvp, cnp);
1587 if (error)
1588 goto bad;
1589
1590 *vpp = tvp;
1591 return (0);
1592
1593bad:
1594 /*
1595 * Write error occurred trying to update the inode
1596 * or the directory so must deallocate the inode.
1597 */
1598 ip->i_nlink = 0;
1599 ip->i_flag |= IN_CHANGE;
1600 vput(tvp);
1601 return (error);
1602}
1603
1604/*
1605 * Vnode op for reading.
1606 */
1607static int
1608ext2_read(struct vop_read_args *ap)
1609{
1610 struct vnode *vp;
1611 struct inode *ip;
1612 int error;
1613
1614 vp = ap->a_vp;
1615 ip = VTOI(vp);
1616
1617 /*EXT4_EXT_LOCK(ip);*/
1618 if (ip->i_flags & EXT4_EXTENTS)
1619 error = ext4_ext_read(ap);
1620 else
1621 error = ext2_ind_read(ap);
1622 /*EXT4_EXT_UNLOCK(ip);*/
1623 return (error);
1624}
1625
1626
1627/*
1628 * Vnode op for reading.
1629 */
1630static int
1631ext2_ind_read(struct vop_read_args *ap)
1632{
1633 struct vnode *vp;
1634 struct inode *ip;
1635 struct uio *uio;
1636 struct m_ext2fs *fs;
1637 struct buf *bp;
1638 daddr_t lbn, nextlbn;
1639 off_t bytesinfile;
1640 long size, xfersize, blkoffset;
1641 int error, orig_resid, seqcount;
1642 int ioflag;
1643
1644 vp = ap->a_vp;
1645 uio = ap->a_uio;
1646 ioflag = ap->a_ioflag;
1647
1648 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
1649 ip = VTOI(vp);
1650
1651#ifdef INVARIANTS
1652 if (uio->uio_rw != UIO_READ)
1653 panic("%s: mode", "ext2_read");
1654
1655 if (vp->v_type == VLNK) {
1656 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
1657 panic("%s: short symlink", "ext2_read");
1658 } else if (vp->v_type != VREG && vp->v_type != VDIR)
1659 panic("%s: type %d", "ext2_read", vp->v_type);
1660#endif
1661 orig_resid = uio->uio_resid;
1662 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
1663 if (orig_resid == 0)
1664 return (0);
1665 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
1666 fs = ip->i_e2fs;
1667 if (uio->uio_offset < ip->i_size &&
1668 uio->uio_offset >= fs->e2fs_maxfilesize)
1669 return (EOVERFLOW);
1670
1671 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
1672 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
1673 break;
1674 lbn = lblkno(fs, uio->uio_offset);
1675 nextlbn = lbn + 1;
1676 size = blksize(fs, ip, lbn);
1677 blkoffset = blkoff(fs, uio->uio_offset);
1678
1679 xfersize = fs->e2fs_fsize - blkoffset;
1680 if (uio->uio_resid < xfersize)
1681 xfersize = uio->uio_resid;
1682 if (bytesinfile < xfersize)
1683 xfersize = bytesinfile;
1684
1685 if (lblktosize(fs, nextlbn) >= ip->i_size)
1686 error = bread(vp, lbn, size, NOCRED, &bp);
1687 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
1688 error = cluster_read(vp, ip->i_size, lbn, size,
1689 NOCRED, blkoffset + uio->uio_resid, seqcount,
1690 0, &bp);
1691 } else if (seqcount > 1) {
| 43 */
44
45#include "opt_suiddir.h"
46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/kernel.h>
50#include <sys/fcntl.h>
51#include <sys/filio.h>
52#include <sys/stat.h>
53#include <sys/bio.h>
54#include <sys/buf.h>
55#include <sys/endian.h>
56#include <sys/priv.h>
57#include <sys/mount.h>
58#include <sys/unistd.h>
59#include <sys/time.h>
60#include <sys/vnode.h>
61#include <sys/namei.h>
62#include <sys/lockf.h>
63#include <sys/event.h>
64#include <sys/conf.h>
65#include <sys/file.h>
66
67#include <vm/vm.h>
68#include <vm/vm_page.h>
69#include <vm/vm_object.h>
70#include <vm/vm_extern.h>
71#include <vm/vnode_pager.h>
72
73#include "opt_directio.h"
74
75#include <ufs/ufs/dir.h>
76
77#include <fs/ext2fs/fs.h>
78#include <fs/ext2fs/inode.h>
79#include <fs/ext2fs/ext2_extern.h>
80#include <fs/ext2fs/ext2fs.h>
81#include <fs/ext2fs/ext2_dinode.h>
82#include <fs/ext2fs/ext2_dir.h>
83#include <fs/ext2fs/ext2_mount.h>
84
85static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
86static void ext2_itimes_locked(struct vnode *);
87static int ext4_ext_read(struct vop_read_args *);
88static int ext2_ind_read(struct vop_read_args *);
89
90static vop_access_t ext2_access;
91static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
92static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
93 struct thread *);
94static vop_close_t ext2_close;
95static vop_create_t ext2_create;
96static vop_fsync_t ext2_fsync;
97static vop_getattr_t ext2_getattr;
98static vop_ioctl_t ext2_ioctl;
99static vop_link_t ext2_link;
100static vop_mkdir_t ext2_mkdir;
101static vop_mknod_t ext2_mknod;
102static vop_open_t ext2_open;
103static vop_pathconf_t ext2_pathconf;
104static vop_print_t ext2_print;
105static vop_read_t ext2_read;
106static vop_readlink_t ext2_readlink;
107static vop_remove_t ext2_remove;
108static vop_rename_t ext2_rename;
109static vop_rmdir_t ext2_rmdir;
110static vop_setattr_t ext2_setattr;
111static vop_strategy_t ext2_strategy;
112static vop_symlink_t ext2_symlink;
113static vop_write_t ext2_write;
114static vop_vptofh_t ext2_vptofh;
115static vop_close_t ext2fifo_close;
116static vop_kqfilter_t ext2fifo_kqfilter;
117
118/* Global vfs data structures for ext2. */
119struct vop_vector ext2_vnodeops = {
120 .vop_default = &default_vnodeops,
121 .vop_access = ext2_access,
122 .vop_bmap = ext2_bmap,
123 .vop_cachedlookup = ext2_lookup,
124 .vop_close = ext2_close,
125 .vop_create = ext2_create,
126 .vop_fsync = ext2_fsync,
127 .vop_getattr = ext2_getattr,
128 .vop_inactive = ext2_inactive,
129 .vop_ioctl = ext2_ioctl,
130 .vop_link = ext2_link,
131 .vop_lookup = vfs_cache_lookup,
132 .vop_mkdir = ext2_mkdir,
133 .vop_mknod = ext2_mknod,
134 .vop_open = ext2_open,
135 .vop_pathconf = ext2_pathconf,
136 .vop_poll = vop_stdpoll,
137 .vop_print = ext2_print,
138 .vop_read = ext2_read,
139 .vop_readdir = ext2_readdir,
140 .vop_readlink = ext2_readlink,
141 .vop_reallocblks = ext2_reallocblks,
142 .vop_reclaim = ext2_reclaim,
143 .vop_remove = ext2_remove,
144 .vop_rename = ext2_rename,
145 .vop_rmdir = ext2_rmdir,
146 .vop_setattr = ext2_setattr,
147 .vop_strategy = ext2_strategy,
148 .vop_symlink = ext2_symlink,
149 .vop_write = ext2_write,
150 .vop_vptofh = ext2_vptofh,
151};
152
153struct vop_vector ext2_fifoops = {
154 .vop_default = &fifo_specops,
155 .vop_access = ext2_access,
156 .vop_close = ext2fifo_close,
157 .vop_fsync = ext2_fsync,
158 .vop_getattr = ext2_getattr,
159 .vop_inactive = ext2_inactive,
160 .vop_kqfilter = ext2fifo_kqfilter,
161 .vop_print = ext2_print,
162 .vop_read = VOP_PANIC,
163 .vop_reclaim = ext2_reclaim,
164 .vop_setattr = ext2_setattr,
165 .vop_write = VOP_PANIC,
166 .vop_vptofh = ext2_vptofh,
167};
168
169/*
170 * A virgin directory (no blushing please).
171 * Note that the type and namlen fields are reversed relative to ext2.
172 * Also, we don't use `struct odirtemplate', since it would just cause
173 * endianness problems.
174 */
175static struct dirtemplate mastertemplate = {
176 0, 12, 1, EXT2_FT_DIR, ".",
177 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
178};
179static struct dirtemplate omastertemplate = {
180 0, 12, 1, EXT2_FT_UNKNOWN, ".",
181 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
182};
183
184static void
185ext2_itimes_locked(struct vnode *vp)
186{
187 struct inode *ip;
188 struct timespec ts;
189
190 ASSERT_VI_LOCKED(vp, __func__);
191
192 ip = VTOI(vp);
193 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
194 return;
195 if ((vp->v_type == VBLK || vp->v_type == VCHR))
196 ip->i_flag |= IN_LAZYMOD;
197 else
198 ip->i_flag |= IN_MODIFIED;
199 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
200 vfs_timestamp(&ts);
201 if (ip->i_flag & IN_ACCESS) {
202 ip->i_atime = ts.tv_sec;
203 ip->i_atimensec = ts.tv_nsec;
204 }
205 if (ip->i_flag & IN_UPDATE) {
206 ip->i_mtime = ts.tv_sec;
207 ip->i_mtimensec = ts.tv_nsec;
208 ip->i_modrev++;
209 }
210 if (ip->i_flag & IN_CHANGE) {
211 ip->i_ctime = ts.tv_sec;
212 ip->i_ctimensec = ts.tv_nsec;
213 }
214 }
215 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
216}
217
218void
219ext2_itimes(struct vnode *vp)
220{
221
222 VI_LOCK(vp);
223 ext2_itimes_locked(vp);
224 VI_UNLOCK(vp);
225}
226
227/*
228 * Create a regular file
229 */
230static int
231ext2_create(struct vop_create_args *ap)
232{
233 int error;
234
235 error =
236 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
237 ap->a_dvp, ap->a_vpp, ap->a_cnp);
238 if (error)
239 return (error);
240 return (0);
241}
242
243static int
244ext2_open(struct vop_open_args *ap)
245{
246
247 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
248 return (EOPNOTSUPP);
249
250 /*
251 * Files marked append-only must be opened for appending.
252 */
253 if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
254 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
255 return (EPERM);
256
257 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
258
259 return (0);
260}
261
262/*
263 * Close called.
264 *
265 * Update the times on the inode.
266 */
267static int
268ext2_close(struct vop_close_args *ap)
269{
270 struct vnode *vp = ap->a_vp;
271
272 VI_LOCK(vp);
273 if (vp->v_usecount > 1)
274 ext2_itimes_locked(vp);
275 VI_UNLOCK(vp);
276 return (0);
277}
278
279static int
280ext2_access(struct vop_access_args *ap)
281{
282 struct vnode *vp = ap->a_vp;
283 struct inode *ip = VTOI(vp);
284 accmode_t accmode = ap->a_accmode;
285 int error;
286
287 if (vp->v_type == VBLK || vp->v_type == VCHR)
288 return (EOPNOTSUPP);
289
290 /*
291 * Disallow write attempts on read-only file systems;
292 * unless the file is a socket, fifo, or a block or
293 * character device resident on the file system.
294 */
295 if (accmode & VWRITE) {
296 switch (vp->v_type) {
297 case VDIR:
298 case VLNK:
299 case VREG:
300 if (vp->v_mount->mnt_flag & MNT_RDONLY)
301 return (EROFS);
302 break;
303 default:
304 break;
305 }
306 }
307
308 /* If immutable bit set, nobody gets to write it. */
309 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT)))
310 return (EPERM);
311
312 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
313 ap->a_accmode, ap->a_cred, NULL);
314 return (error);
315}
316
317static int
318ext2_getattr(struct vop_getattr_args *ap)
319{
320 struct vnode *vp = ap->a_vp;
321 struct inode *ip = VTOI(vp);
322 struct vattr *vap = ap->a_vap;
323
324 ext2_itimes(vp);
325 /*
326 * Copy from inode table
327 */
328 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
329 vap->va_fileid = ip->i_number;
330 vap->va_mode = ip->i_mode & ~IFMT;
331 vap->va_nlink = ip->i_nlink;
332 vap->va_uid = ip->i_uid;
333 vap->va_gid = ip->i_gid;
334 vap->va_rdev = ip->i_rdev;
335 vap->va_size = ip->i_size;
336 vap->va_atime.tv_sec = ip->i_atime;
337 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
338 vap->va_mtime.tv_sec = ip->i_mtime;
339 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
340 vap->va_ctime.tv_sec = ip->i_ctime;
341 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
342 if E2DI_HAS_XTIME(ip) {
343 vap->va_birthtime.tv_sec = ip->i_birthtime;
344 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
345 }
346 vap->va_flags = ip->i_flags;
347 vap->va_gen = ip->i_gen;
348 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
349 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
350 vap->va_type = IFTOVT(ip->i_mode);
351 vap->va_filerev = ip->i_modrev;
352 return (0);
353}
354
355/*
356 * Set attribute vnode op. called from several syscalls
357 */
358static int
359ext2_setattr(struct vop_setattr_args *ap)
360{
361 struct vattr *vap = ap->a_vap;
362 struct vnode *vp = ap->a_vp;
363 struct inode *ip = VTOI(vp);
364 struct ucred *cred = ap->a_cred;
365 struct thread *td = curthread;
366 int error;
367
368 /*
369 * Check for unsettable attributes.
370 */
371 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
372 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
373 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
374 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
375 return (EINVAL);
376 }
377 if (vap->va_flags != VNOVAL) {
378 /* Disallow flags not supported by ext2fs. */
379 if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
380 return (EOPNOTSUPP);
381
382 if (vp->v_mount->mnt_flag & MNT_RDONLY)
383 return (EROFS);
384 /*
385 * Callers may only modify the file flags on objects they
386 * have VADMIN rights for.
387 */
388 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
389 return (error);
390 /*
391 * Unprivileged processes and privileged processes in
392 * jail() are not permitted to unset system flags, or
393 * modify flags if any system flags are set.
394 * Privileged non-jail processes may not modify system flags
395 * if securelevel > 0 and any existing system flags are set.
396 */
397 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
398 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
399 error = securelevel_gt(cred, 0);
400 if (error)
401 return (error);
402 }
403 } else {
404 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
405 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
406 return (EPERM);
407 }
408 ip->i_flags = vap->va_flags;
409 ip->i_flag |= IN_CHANGE;
410 if (ip->i_flags & (IMMUTABLE | APPEND))
411 return (0);
412 }
413 if (ip->i_flags & (IMMUTABLE | APPEND))
414 return (EPERM);
415 /*
416 * Go through the fields and update iff not VNOVAL.
417 */
418 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
419 if (vp->v_mount->mnt_flag & MNT_RDONLY)
420 return (EROFS);
421 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
422 td)) != 0)
423 return (error);
424 }
425 if (vap->va_size != VNOVAL) {
426 /*
427 * Disallow write attempts on read-only file systems;
428 * unless the file is a socket, fifo, or a block or
429 * character device resident on the file system.
430 */
431 switch (vp->v_type) {
432 case VDIR:
433 return (EISDIR);
434 case VLNK:
435 case VREG:
436 if (vp->v_mount->mnt_flag & MNT_RDONLY)
437 return (EROFS);
438 break;
439 default:
440 break;
441 }
442 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
443 return (error);
444 }
445 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
446 if (vp->v_mount->mnt_flag & MNT_RDONLY)
447 return (EROFS);
448 /*
449 * From utimes(2):
450 * If times is NULL, ... The caller must be the owner of
451 * the file, have permission to write the file, or be the
452 * super-user.
453 * If times is non-NULL, ... The caller must be the owner of
454 * the file or be the super-user.
455 */
456 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
457 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
458 (error = VOP_ACCESS(vp, VWRITE, cred, td))))
459 return (error);
460 if (vap->va_atime.tv_sec != VNOVAL)
461 ip->i_flag |= IN_ACCESS;
462 if (vap->va_mtime.tv_sec != VNOVAL)
463 ip->i_flag |= IN_CHANGE | IN_UPDATE;
464 ext2_itimes(vp);
465 if (vap->va_atime.tv_sec != VNOVAL) {
466 ip->i_atime = vap->va_atime.tv_sec;
467 ip->i_atimensec = vap->va_atime.tv_nsec;
468 }
469 if (vap->va_mtime.tv_sec != VNOVAL) {
470 ip->i_mtime = vap->va_mtime.tv_sec;
471 ip->i_mtimensec = vap->va_mtime.tv_nsec;
472 }
473 ip->i_birthtime = vap->va_birthtime.tv_sec;
474 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
475 error = ext2_update(vp, 0);
476 if (error)
477 return (error);
478 }
479 error = 0;
480 if (vap->va_mode != (mode_t)VNOVAL) {
481 if (vp->v_mount->mnt_flag & MNT_RDONLY)
482 return (EROFS);
483 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
484 }
485 return (error);
486}
487
488/*
489 * Change the mode on a file.
490 * Inode must be locked before calling.
491 */
492static int
493ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
494{
495 struct inode *ip = VTOI(vp);
496 int error;
497
498 /*
499 * To modify the permissions on a file, must possess VADMIN
500 * for that file.
501 */
502 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
503 return (error);
504 /*
505 * Privileged processes may set the sticky bit on non-directories,
506 * as well as set the setgid bit on a file with a group that the
507 * process is not a member of.
508 */
509 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
510 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0);
511 if (error)
512 return (EFTYPE);
513 }
514 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
515 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
516 if (error)
517 return (error);
518 }
519 ip->i_mode &= ~ALLPERMS;
520 ip->i_mode |= (mode & ALLPERMS);
521 ip->i_flag |= IN_CHANGE;
522 return (0);
523}
524
525/*
526 * Perform chown operation on inode ip;
527 * inode must be locked prior to call.
528 */
529static int
530ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
531 struct thread *td)
532{
533 struct inode *ip = VTOI(vp);
534 uid_t ouid;
535 gid_t ogid;
536 int error = 0;
537
538 if (uid == (uid_t)VNOVAL)
539 uid = ip->i_uid;
540 if (gid == (gid_t)VNOVAL)
541 gid = ip->i_gid;
542 /*
543 * To modify the ownership of a file, must possess VADMIN
544 * for that file.
545 */
546 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
547 return (error);
548 /*
549 * To change the owner of a file, or change the group of a file
550 * to a group of which we are not a member, the caller must
551 * have privilege.
552 */
553 if (uid != ip->i_uid || (gid != ip->i_gid &&
554 !groupmember(gid, cred))) {
555 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
556 if (error)
557 return (error);
558 }
559 ogid = ip->i_gid;
560 ouid = ip->i_uid;
561 ip->i_gid = gid;
562 ip->i_uid = uid;
563 ip->i_flag |= IN_CHANGE;
564 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
565 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0)
566 ip->i_mode &= ~(ISUID | ISGID);
567 }
568 return (0);
569}
570
571/*
572 * Synch an open file.
573 */
574/* ARGSUSED */
575static int
576ext2_fsync(struct vop_fsync_args *ap)
577{
578 /*
579 * Flush all dirty buffers associated with a vnode.
580 */
581
582 vop_stdfsync(ap);
583
584 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
585}
586
587/*
588 * Mknod vnode call
589 */
590/* ARGSUSED */
591static int
592ext2_mknod(struct vop_mknod_args *ap)
593{
594 struct vattr *vap = ap->a_vap;
595 struct vnode **vpp = ap->a_vpp;
596 struct inode *ip;
597 ino_t ino;
598 int error;
599
600 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
601 ap->a_dvp, vpp, ap->a_cnp);
602 if (error)
603 return (error);
604 ip = VTOI(*vpp);
605 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
606 if (vap->va_rdev != VNOVAL) {
607 /*
608 * Want to be able to use this to make badblock
609 * inodes, so don't truncate the dev number.
610 */
611 ip->i_rdev = vap->va_rdev;
612 }
613 /*
614 * Remove inode, then reload it through VFS_VGET so it is
615 * checked to see if it is an alias of an existing entry in
616 * the inode cache. XXX I don't believe this is necessary now.
617 */
618 (*vpp)->v_type = VNON;
619 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
620 vgone(*vpp);
621 vput(*vpp);
622 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
623 if (error) {
624 *vpp = NULL;
625 return (error);
626 }
627 return (0);
628}
629
630static int
631ext2_remove(struct vop_remove_args *ap)
632{
633 struct inode *ip;
634 struct vnode *vp = ap->a_vp;
635 struct vnode *dvp = ap->a_dvp;
636 int error;
637
638 ip = VTOI(vp);
639 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
640 (VTOI(dvp)->i_flags & APPEND)) {
641 error = EPERM;
642 goto out;
643 }
644 error = ext2_dirremove(dvp, ap->a_cnp);
645 if (error == 0) {
646 ip->i_nlink--;
647 ip->i_flag |= IN_CHANGE;
648 }
649out:
650 return (error);
651}
652
653/*
654 * link vnode call
655 */
656static int
657ext2_link(struct vop_link_args *ap)
658{
659 struct vnode *vp = ap->a_vp;
660 struct vnode *tdvp = ap->a_tdvp;
661 struct componentname *cnp = ap->a_cnp;
662 struct inode *ip;
663 int error;
664
665#ifdef INVARIANTS
666 if ((cnp->cn_flags & HASBUF) == 0)
667 panic("ext2_link: no name");
668#endif
669 if (tdvp->v_mount != vp->v_mount) {
670 error = EXDEV;
671 goto out;
672 }
673 ip = VTOI(vp);
674 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) {
675 error = EMLINK;
676 goto out;
677 }
678 if (ip->i_flags & (IMMUTABLE | APPEND)) {
679 error = EPERM;
680 goto out;
681 }
682 ip->i_nlink++;
683 ip->i_flag |= IN_CHANGE;
684 error = ext2_update(vp, !DOINGASYNC(vp));
685 if (!error)
686 error = ext2_direnter(ip, tdvp, cnp);
687 if (error) {
688 ip->i_nlink--;
689 ip->i_flag |= IN_CHANGE;
690 }
691out:
692 return (error);
693}
694
695/*
696 * Rename system call.
697 * rename("foo", "bar");
698 * is essentially
699 * unlink("bar");
700 * link("foo", "bar");
701 * unlink("foo");
702 * but ``atomically''. Can't do full commit without saving state in the
703 * inode on disk which isn't feasible at this time. Best we can do is
704 * always guarantee the target exists.
705 *
706 * Basic algorithm is:
707 *
708 * 1) Bump link count on source while we're linking it to the
709 * target. This also ensure the inode won't be deleted out
710 * from underneath us while we work (it may be truncated by
711 * a concurrent `trunc' or `open' for creation).
712 * 2) Link source to destination. If destination already exists,
713 * delete it first.
714 * 3) Unlink source reference to inode if still around. If a
715 * directory was moved and the parent of the destination
716 * is different from the source, patch the ".." entry in the
717 * directory.
718 */
719static int
720ext2_rename(struct vop_rename_args *ap)
721{
722 struct vnode *tvp = ap->a_tvp;
723 struct vnode *tdvp = ap->a_tdvp;
724 struct vnode *fvp = ap->a_fvp;
725 struct vnode *fdvp = ap->a_fdvp;
726 struct componentname *tcnp = ap->a_tcnp;
727 struct componentname *fcnp = ap->a_fcnp;
728 struct inode *ip, *xp, *dp;
729 struct dirtemplate dirbuf;
730 int doingdirectory = 0, oldparent = 0, newparent = 0;
731 int error = 0;
732 u_char namlen;
733
734#ifdef INVARIANTS
735 if ((tcnp->cn_flags & HASBUF) == 0 ||
736 (fcnp->cn_flags & HASBUF) == 0)
737 panic("ext2_rename: no name");
738#endif
739 /*
740 * Check for cross-device rename.
741 */
742 if ((fvp->v_mount != tdvp->v_mount) ||
743 (tvp && (fvp->v_mount != tvp->v_mount))) {
744 error = EXDEV;
745abortit:
746 if (tdvp == tvp)
747 vrele(tdvp);
748 else
749 vput(tdvp);
750 if (tvp)
751 vput(tvp);
752 vrele(fdvp);
753 vrele(fvp);
754 return (error);
755 }
756
757 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
758 (VTOI(tdvp)->i_flags & APPEND))) {
759 error = EPERM;
760 goto abortit;
761 }
762
763 /*
764 * Renaming a file to itself has no effect. The upper layers should
765 * not call us in that case. Temporarily just warn if they do.
766 */
767 if (fvp == tvp) {
768 printf("ext2_rename: fvp == tvp (can't happen)\n");
769 error = 0;
770 goto abortit;
771 }
772
773 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
774 goto abortit;
775 dp = VTOI(fdvp);
776 ip = VTOI(fvp);
777 if (ip->i_nlink >= EXT2_LINK_MAX) {
778 VOP_UNLOCK(fvp, 0);
779 error = EMLINK;
780 goto abortit;
781 }
782 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
783 || (dp->i_flags & APPEND)) {
784 VOP_UNLOCK(fvp, 0);
785 error = EPERM;
786 goto abortit;
787 }
788 if ((ip->i_mode & IFMT) == IFDIR) {
789 /*
790 * Avoid ".", "..", and aliases of "." for obvious reasons.
791 */
792 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
793 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
794 (ip->i_flag & IN_RENAME)) {
795 VOP_UNLOCK(fvp, 0);
796 error = EINVAL;
797 goto abortit;
798 }
799 ip->i_flag |= IN_RENAME;
800 oldparent = dp->i_number;
801 doingdirectory++;
802 }
803 vrele(fdvp);
804
805 /*
806 * When the target exists, both the directory
807 * and target vnodes are returned locked.
808 */
809 dp = VTOI(tdvp);
810 xp = NULL;
811 if (tvp)
812 xp = VTOI(tvp);
813
814 /*
815 * 1) Bump link count while we're moving stuff
816 * around. If we crash somewhere before
817 * completing our work, the link count
818 * may be wrong, but correctable.
819 */
820 ip->i_nlink++;
821 ip->i_flag |= IN_CHANGE;
822 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
823 VOP_UNLOCK(fvp, 0);
824 goto bad;
825 }
826
827 /*
828 * If ".." must be changed (ie the directory gets a new
829 * parent) then the source directory must not be in the
830 * directory hierarchy above the target, as this would
831 * orphan everything below the source directory. Also
832 * the user must have write permission in the source so
833 * as to be able to change "..". We must repeat the call
834 * to namei, as the parent directory is unlocked by the
835 * call to checkpath().
836 */
837 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
838 VOP_UNLOCK(fvp, 0);
839 if (oldparent != dp->i_number)
840 newparent = dp->i_number;
841 if (doingdirectory && newparent) {
842 if (error) /* write access check above */
843 goto bad;
844 if (xp != NULL)
845 vput(tvp);
846 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
847 if (error)
848 goto out;
849 VREF(tdvp);
850 error = relookup(tdvp, &tvp, tcnp);
851 if (error)
852 goto out;
853 vrele(tdvp);
854 dp = VTOI(tdvp);
855 xp = NULL;
856 if (tvp)
857 xp = VTOI(tvp);
858 }
859 /*
860 * 2) If target doesn't exist, link the target
861 * to the source and unlink the source.
862 * Otherwise, rewrite the target directory
863 * entry to reference the source inode and
864 * expunge the original entry's existence.
865 */
866 if (xp == NULL) {
867 if (dp->i_devvp != ip->i_devvp)
868 panic("ext2_rename: EXDEV");
869 /*
870 * Account for ".." in new directory.
871 * When source and destination have the same
872 * parent we don't fool with the link count.
873 */
874 if (doingdirectory && newparent) {
875 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) {
876 error = EMLINK;
877 goto bad;
878 }
879 dp->i_nlink++;
880 dp->i_flag |= IN_CHANGE;
881 error = ext2_update(tdvp, !DOINGASYNC(tdvp));
882 if (error)
883 goto bad;
884 }
885 error = ext2_direnter(ip, tdvp, tcnp);
886 if (error) {
887 if (doingdirectory && newparent) {
888 dp->i_nlink--;
889 dp->i_flag |= IN_CHANGE;
890 (void)ext2_update(tdvp, 1);
891 }
892 goto bad;
893 }
894 vput(tdvp);
895 } else {
896 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
897 panic("ext2_rename: EXDEV");
898 /*
899 * Short circuit rename(foo, foo).
900 */
901 if (xp->i_number == ip->i_number)
902 panic("ext2_rename: same file");
903 /*
904 * If the parent directory is "sticky", then the user must
905 * own the parent directory, or the destination of the rename,
906 * otherwise the destination may not be changed (except by
907 * root). This implements append-only directories.
908 */
909 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
910 tcnp->cn_cred->cr_uid != dp->i_uid &&
911 xp->i_uid != tcnp->cn_cred->cr_uid) {
912 error = EPERM;
913 goto bad;
914 }
915 /*
916 * Target must be empty if a directory and have no links
917 * to it. Also, ensure source and target are compatible
918 * (both directories, or both not directories).
919 */
920 if ((xp->i_mode&IFMT) == IFDIR) {
921 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
922 xp->i_nlink > 2) {
923 error = ENOTEMPTY;
924 goto bad;
925 }
926 if (!doingdirectory) {
927 error = ENOTDIR;
928 goto bad;
929 }
930 cache_purge(tdvp);
931 } else if (doingdirectory) {
932 error = EISDIR;
933 goto bad;
934 }
935 error = ext2_dirrewrite(dp, ip, tcnp);
936 if (error)
937 goto bad;
938 /*
939 * If the target directory is in the same
940 * directory as the source directory,
941 * decrement the link count on the parent
942 * of the target directory.
943 */
944 if (doingdirectory && !newparent) {
945 dp->i_nlink--;
946 dp->i_flag |= IN_CHANGE;
947 }
948 vput(tdvp);
949 /*
950 * Adjust the link count of the target to
951 * reflect the dirrewrite above. If this is
952 * a directory it is empty and there are
953 * no links to it, so we can squash the inode and
954 * any space associated with it. We disallowed
955 * renaming over top of a directory with links to
956 * it above, as the remaining link would point to
957 * a directory without "." or ".." entries.
958 */
959 xp->i_nlink--;
960 if (doingdirectory) {
961 if (--xp->i_nlink != 0)
962 panic("ext2_rename: linked directory");
963 error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
964 tcnp->cn_cred, tcnp->cn_thread);
965 }
966 xp->i_flag |= IN_CHANGE;
967 vput(tvp);
968 xp = NULL;
969 }
970
971 /*
972 * 3) Unlink the source.
973 */
974 fcnp->cn_flags &= ~MODMASK;
975 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
976 VREF(fdvp);
977 error = relookup(fdvp, &fvp, fcnp);
978 if (error == 0)
979 vrele(fdvp);
980 if (fvp != NULL) {
981 xp = VTOI(fvp);
982 dp = VTOI(fdvp);
983 } else {
984 /*
985 * From name has disappeared.
986 */
987 if (doingdirectory)
988 panic("ext2_rename: lost dir entry");
989 vrele(ap->a_fvp);
990 return (0);
991 }
992 /*
993 * Ensure that the directory entry still exists and has not
994 * changed while the new name has been entered. If the source is
995 * a file then the entry may have been unlinked or renamed. In
996 * either case there is no further work to be done. If the source
997 * is a directory then it cannot have been rmdir'ed; its link
998 * count of three would cause a rmdir to fail with ENOTEMPTY.
999 * The IN_RENAME flag ensures that it cannot be moved by another
1000 * rename.
1001 */
1002 if (xp != ip) {
1003 if (doingdirectory)
1004 panic("ext2_rename: lost dir entry");
1005 } else {
1006 /*
1007 * If the source is a directory with a
1008 * new parent, the link count of the old
1009 * parent directory must be decremented
1010 * and ".." set to point to the new parent.
1011 */
1012 if (doingdirectory && newparent) {
1013 dp->i_nlink--;
1014 dp->i_flag |= IN_CHANGE;
1015 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
1016 sizeof(struct dirtemplate), (off_t)0,
1017 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1018 tcnp->cn_cred, NOCRED, NULL, NULL);
1019 if (error == 0) {
1020 /* Like ufs little-endian: */
1021 namlen = dirbuf.dotdot_type;
1022 if (namlen != 2 ||
1023 dirbuf.dotdot_name[0] != '.' ||
1024 dirbuf.dotdot_name[1] != '.') {
1025 ext2_dirbad(xp, (doff_t)12,
1026 "rename: mangled dir");
1027 } else {
1028 dirbuf.dotdot_ino = newparent;
1029 (void) vn_rdwr(UIO_WRITE, fvp,
1030 (caddr_t)&dirbuf,
1031 sizeof(struct dirtemplate),
1032 (off_t)0, UIO_SYSSPACE,
1033 IO_NODELOCKED | IO_SYNC |
1034 IO_NOMACCHECK, tcnp->cn_cred,
1035 NOCRED, NULL, NULL);
1036 cache_purge(fdvp);
1037 }
1038 }
1039 }
1040 error = ext2_dirremove(fdvp, fcnp);
1041 if (!error) {
1042 xp->i_nlink--;
1043 xp->i_flag |= IN_CHANGE;
1044 }
1045 xp->i_flag &= ~IN_RENAME;
1046 }
1047 if (dp)
1048 vput(fdvp);
1049 if (xp)
1050 vput(fvp);
1051 vrele(ap->a_fvp);
1052 return (error);
1053
1054bad:
1055 if (xp)
1056 vput(ITOV(xp));
1057 vput(ITOV(dp));
1058out:
1059 if (doingdirectory)
1060 ip->i_flag &= ~IN_RENAME;
1061 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
1062 ip->i_nlink--;
1063 ip->i_flag |= IN_CHANGE;
1064 ip->i_flag &= ~IN_RENAME;
1065 vput(fvp);
1066 } else
1067 vrele(fvp);
1068 return (error);
1069}
1070
1071/*
1072 * Mkdir system call
1073 */
1074static int
1075ext2_mkdir(struct vop_mkdir_args *ap)
1076{
1077 struct vnode *dvp = ap->a_dvp;
1078 struct vattr *vap = ap->a_vap;
1079 struct componentname *cnp = ap->a_cnp;
1080 struct inode *ip, *dp;
1081 struct vnode *tvp;
1082 struct dirtemplate dirtemplate, *dtp;
1083 int error, dmode;
1084
1085#ifdef INVARIANTS
1086 if ((cnp->cn_flags & HASBUF) == 0)
1087 panic("ext2_mkdir: no name");
1088#endif
1089 dp = VTOI(dvp);
1090 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) {
1091 error = EMLINK;
1092 goto out;
1093 }
1094 dmode = vap->va_mode & 0777;
1095 dmode |= IFDIR;
1096 /*
1097 * Must simulate part of ext2_makeinode here to acquire the inode,
1098 * but not have it entered in the parent directory. The entry is
1099 * made later after writing "." and ".." entries.
1100 */
1101 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
1102 if (error)
1103 goto out;
1104 ip = VTOI(tvp);
1105 ip->i_gid = dp->i_gid;
1106#ifdef SUIDDIR
1107 {
1108 /*
1109 * if we are hacking owners here, (only do this where told to)
1110 * and we are not giving it TOO root, (would subvert quotas)
1111 * then go ahead and give it to the other user.
1112 * The new directory also inherits the SUID bit.
1113 * If user's UID and dir UID are the same,
1114 * 'give it away' so that the SUID is still forced on.
1115 */
1116 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1117 (dp->i_mode & ISUID) && dp->i_uid) {
1118 dmode |= ISUID;
1119 ip->i_uid = dp->i_uid;
1120 } else {
1121 ip->i_uid = cnp->cn_cred->cr_uid;
1122 }
1123 }
1124#else
1125 ip->i_uid = cnp->cn_cred->cr_uid;
1126#endif
1127 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1128 ip->i_mode = dmode;
1129 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1130 ip->i_nlink = 2;
1131 if (cnp->cn_flags & ISWHITEOUT)
1132 ip->i_flags |= UF_OPAQUE;
1133 error = ext2_update(tvp, 1);
1134
1135 /*
1136 * Bump link count in parent directory
1137 * to reflect work done below. Should
1138 * be done before reference is created
1139 * so reparation is possible if we crash.
1140 */
1141 dp->i_nlink++;
1142 dp->i_flag |= IN_CHANGE;
1143 error = ext2_update(dvp, !DOINGASYNC(dvp));
1144 if (error)
1145 goto bad;
1146
1147 /* Initialize directory with "." and ".." from static template. */
1148 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
1149 EXT2F_INCOMPAT_FTYPE))
1150 dtp = &mastertemplate;
1151 else
1152 dtp = &omastertemplate;
1153 dirtemplate = *dtp;
1154 dirtemplate.dot_ino = ip->i_number;
1155 dirtemplate.dotdot_ino = dp->i_number;
1156 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE
1157 * so let's just redefine it - for this function only
1158 */
1159#undef DIRBLKSIZ
1160#define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize
1161 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
1162 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
1163 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE,
1164 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
1165 NULL, NULL);
1166 if (error) {
1167 dp->i_nlink--;
1168 dp->i_flag |= IN_CHANGE;
1169 goto bad;
1170 }
1171 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
1172 /* XXX should grow with balloc() */
1173 panic("ext2_mkdir: blksize");
1174 else {
1175 ip->i_size = DIRBLKSIZ;
1176 ip->i_flag |= IN_CHANGE;
1177 }
1178
1179 /* Directory set up, now install its entry in the parent directory. */
1180 error = ext2_direnter(ip, dvp, cnp);
1181 if (error) {
1182 dp->i_nlink--;
1183 dp->i_flag |= IN_CHANGE;
1184 }
1185bad:
1186 /*
1187 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
1188 * for us because we set the link count to 0.
1189 */
1190 if (error) {
1191 ip->i_nlink = 0;
1192 ip->i_flag |= IN_CHANGE;
1193 vput(tvp);
1194 } else
1195 *ap->a_vpp = tvp;
1196out:
1197 return (error);
1198#undef DIRBLKSIZ
1199#define DIRBLKSIZ DEV_BSIZE
1200}
1201
1202/*
1203 * Rmdir system call.
1204 */
1205static int
1206ext2_rmdir(struct vop_rmdir_args *ap)
1207{
1208 struct vnode *vp = ap->a_vp;
1209 struct vnode *dvp = ap->a_dvp;
1210 struct componentname *cnp = ap->a_cnp;
1211 struct inode *ip, *dp;
1212 int error;
1213
1214 ip = VTOI(vp);
1215 dp = VTOI(dvp);
1216
1217 /*
1218 * Verify the directory is empty (and valid).
1219 * (Rmdir ".." won't be valid since
1220 * ".." will contain a reference to
1221 * the current directory and thus be
1222 * non-empty.)
1223 */
1224 error = 0;
1225 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1226 error = ENOTEMPTY;
1227 goto out;
1228 }
1229 if ((dp->i_flags & APPEND)
1230 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1231 error = EPERM;
1232 goto out;
1233 }
1234 /*
1235 * Delete reference to directory before purging
1236 * inode. If we crash in between, the directory
1237 * will be reattached to lost+found,
1238 */
1239 error = ext2_dirremove(dvp, cnp);
1240 if (error)
1241 goto out;
1242 dp->i_nlink--;
1243 dp->i_flag |= IN_CHANGE;
1244 cache_purge(dvp);
1245 VOP_UNLOCK(dvp, 0);
1246 /*
1247 * Truncate inode. The only stuff left
1248 * in the directory is "." and "..". The
1249 * "." reference is inconsequential since
1250 * we're quashing it. The ".." reference
1251 * has already been adjusted above. We've
1252 * removed the "." reference and the reference
1253 * in the parent directory, but there may be
1254 * other hard links so decrement by 2 and
1255 * worry about them later.
1256 */
1257 ip->i_nlink -= 2;
1258 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
1259 cnp->cn_thread);
1260 cache_purge(ITOV(ip));
1261 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1262 VOP_UNLOCK(vp, 0);
1263 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1264 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1265 }
1266out:
1267 return (error);
1268}
1269
1270/*
1271 * symlink -- make a symbolic link
1272 */
1273static int
1274ext2_symlink(struct vop_symlink_args *ap)
1275{
1276 struct vnode *vp, **vpp = ap->a_vpp;
1277 struct inode *ip;
1278 int len, error;
1279
1280 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1281 vpp, ap->a_cnp);
1282 if (error)
1283 return (error);
1284 vp = *vpp;
1285 len = strlen(ap->a_target);
1286 if (len < vp->v_mount->mnt_maxsymlinklen) {
1287 ip = VTOI(vp);
1288 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
1289 ip->i_size = len;
1290 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1291 } else
1292 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
1293 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1294 ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
1295 if (error)
1296 vput(vp);
1297 return (error);
1298}
1299
1300/*
1301 * Return target name of a symbolic link
1302 */
1303static int
1304ext2_readlink(struct vop_readlink_args *ap)
1305{
1306 struct vnode *vp = ap->a_vp;
1307 struct inode *ip = VTOI(vp);
1308 int isize;
1309
1310 isize = ip->i_size;
1311 if (isize < vp->v_mount->mnt_maxsymlinklen) {
1312 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
1313 return (0);
1314 }
1315 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1316}
1317
1318/*
1319 * Calculate the logical to physical mapping if not done already,
1320 * then call the device strategy routine.
1321 *
1322 * In order to be able to swap to a file, the ext2_bmaparray() operation may not
1323 * deadlock on memory. See ext2_bmap() for details.
1324 */
1325static int
1326ext2_strategy(struct vop_strategy_args *ap)
1327{
1328 struct buf *bp = ap->a_bp;
1329 struct vnode *vp = ap->a_vp;
1330 struct inode *ip;
1331 struct bufobj *bo;
1332 daddr_t blkno;
1333 int error;
1334
1335 ip = VTOI(vp);
1336 if (vp->v_type == VBLK || vp->v_type == VCHR)
1337 panic("ext2_strategy: spec");
1338 if (bp->b_blkno == bp->b_lblkno) {
1339 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
1340 bp->b_blkno = blkno;
1341 if (error) {
1342 bp->b_error = error;
1343 bp->b_ioflags |= BIO_ERROR;
1344 bufdone(bp);
1345 return (0);
1346 }
1347 if ((long)bp->b_blkno == -1)
1348 vfs_bio_clrbuf(bp);
1349 }
1350 if ((long)bp->b_blkno == -1) {
1351 bufdone(bp);
1352 return (0);
1353 }
1354 bp->b_iooffset = dbtob(bp->b_blkno);
1355 bo = VFSTOEXT2(vp->v_mount)->um_bo;
1356 BO_STRATEGY(bo, bp);
1357 return (0);
1358}
1359
1360/*
1361 * Print out the contents of an inode.
1362 */
1363static int
1364ext2_print(struct vop_print_args *ap)
1365{
1366 struct vnode *vp = ap->a_vp;
1367 struct inode *ip = VTOI(vp);
1368
1369 vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number);
1370 if (vp->v_type == VFIFO)
1371 fifo_printinfo(vp);
1372 printf("\n");
1373 return (0);
1374}
1375
1376/*
1377 * Close wrapper for fifos.
1378 *
1379 * Update the times on the inode then do device close.
1380 */
1381static int
1382ext2fifo_close(struct vop_close_args *ap)
1383{
1384 struct vnode *vp = ap->a_vp;
1385
1386 VI_LOCK(vp);
1387 if (vp->v_usecount > 1)
1388 ext2_itimes_locked(vp);
1389 VI_UNLOCK(vp);
1390 return (fifo_specops.vop_close(ap));
1391}
1392
1393/*
1394 * Kqfilter wrapper for fifos.
1395 *
1396 * Fall through to ext2 kqfilter routines if needed
1397 */
1398static int
1399ext2fifo_kqfilter(struct vop_kqfilter_args *ap)
1400{
1401 int error;
1402
1403 error = fifo_specops.vop_kqfilter(ap);
1404 if (error)
1405 error = vfs_kqfilter(ap);
1406 return (error);
1407}
1408
1409/*
1410 * Return POSIX pathconf information applicable to ext2 filesystems.
1411 */
1412static int
1413ext2_pathconf(struct vop_pathconf_args *ap)
1414{
1415 int error = 0;
1416
1417 switch (ap->a_name) {
1418 case _PC_LINK_MAX:
1419 *ap->a_retval = EXT2_LINK_MAX;
1420 break;
1421 case _PC_NAME_MAX:
1422 *ap->a_retval = NAME_MAX;
1423 break;
1424 case _PC_PATH_MAX:
1425 *ap->a_retval = PATH_MAX;
1426 break;
1427 case _PC_PIPE_BUF:
1428 *ap->a_retval = PIPE_BUF;
1429 break;
1430 case _PC_CHOWN_RESTRICTED:
1431 *ap->a_retval = 1;
1432 break;
1433 case _PC_NO_TRUNC:
1434 *ap->a_retval = 1;
1435 break;
1436 case _PC_MIN_HOLE_SIZE:
1437 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1438 break;
1439 case _PC_ASYNC_IO:
1440 /* _PC_ASYNC_IO should have been handled by upper layers. */
1441 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
1442 error = EINVAL;
1443 break;
1444 case _PC_PRIO_IO:
1445 *ap->a_retval = 0;
1446 break;
1447 case _PC_SYNC_IO:
1448 *ap->a_retval = 0;
1449 break;
1450 case _PC_ALLOC_SIZE_MIN:
1451 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
1452 break;
1453 case _PC_FILESIZEBITS:
1454 *ap->a_retval = 64;
1455 break;
1456 case _PC_REC_INCR_XFER_SIZE:
1457 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1458 break;
1459 case _PC_REC_MAX_XFER_SIZE:
1460 *ap->a_retval = -1; /* means ``unlimited'' */
1461 break;
1462 case _PC_REC_MIN_XFER_SIZE:
1463 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1464 break;
1465 case _PC_REC_XFER_ALIGN:
1466 *ap->a_retval = PAGE_SIZE;
1467 break;
1468 case _PC_SYMLINK_MAX:
1469 *ap->a_retval = MAXPATHLEN;
1470 break;
1471
1472 default:
1473 error = EINVAL;
1474 break;
1475 }
1476 return (error);
1477}
1478
1479/*
1480 * Vnode pointer to File handle
1481 */
1482/* ARGSUSED */
1483static int
1484ext2_vptofh(struct vop_vptofh_args *ap)
1485{
1486 struct inode *ip;
1487 struct ufid *ufhp;
1488
1489 ip = VTOI(ap->a_vp);
1490 ufhp = (struct ufid *)ap->a_fhp;
1491 ufhp->ufid_len = sizeof(struct ufid);
1492 ufhp->ufid_ino = ip->i_number;
1493 ufhp->ufid_gen = ip->i_gen;
1494 return (0);
1495}
1496
1497/*
1498 * Initialize the vnode associated with a new inode, handle aliased
1499 * vnodes.
1500 */
1501int
1502ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
1503{
1504 struct inode *ip;
1505 struct vnode *vp;
1506
1507 vp = *vpp;
1508 ip = VTOI(vp);
1509 vp->v_type = IFTOVT(ip->i_mode);
1510 if (vp->v_type == VFIFO)
1511 vp->v_op = fifoops;
1512
1513 if (ip->i_number == EXT2_ROOTINO)
1514 vp->v_vflag |= VV_ROOT;
1515 ip->i_modrev = init_va_filerev();
1516 *vpp = vp;
1517 return (0);
1518}
1519
1520/*
1521 * Allocate a new inode.
1522 */
1523static int
1524ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1525 struct componentname *cnp)
1526{
1527 struct inode *ip, *pdir;
1528 struct vnode *tvp;
1529 int error;
1530
1531 pdir = VTOI(dvp);
1532#ifdef INVARIANTS
1533 if ((cnp->cn_flags & HASBUF) == 0)
1534 panic("ext2_makeinode: no name");
1535#endif
1536 *vpp = NULL;
1537 if ((mode & IFMT) == 0)
1538 mode |= IFREG;
1539
1540 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
1541 if (error) {
1542 return (error);
1543 }
1544 ip = VTOI(tvp);
1545 ip->i_gid = pdir->i_gid;
1546#ifdef SUIDDIR
1547 {
1548 /*
1549 * if we are
1550 * not the owner of the directory,
1551 * and we are hacking owners here, (only do this where told to)
1552 * and we are not giving it TOO root, (would subvert quotas)
1553 * then go ahead and give it to the other user.
1554 * Note that this drops off the execute bits for security.
1555 */
1556 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1557 (pdir->i_mode & ISUID) &&
1558 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
1559 ip->i_uid = pdir->i_uid;
1560 mode &= ~07111;
1561 } else {
1562 ip->i_uid = cnp->cn_cred->cr_uid;
1563 }
1564 }
1565#else
1566 ip->i_uid = cnp->cn_cred->cr_uid;
1567#endif
1568 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1569 ip->i_mode = mode;
1570 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1571 ip->i_nlink = 1;
1572 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
1573 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0))
1574 ip->i_mode &= ~ISGID;
1575 }
1576
1577 if (cnp->cn_flags & ISWHITEOUT)
1578 ip->i_flags |= UF_OPAQUE;
1579
1580 /*
1581 * Make sure inode goes to disk before directory entry.
1582 */
1583 error = ext2_update(tvp, !DOINGASYNC(tvp));
1584 if (error)
1585 goto bad;
1586 error = ext2_direnter(ip, dvp, cnp);
1587 if (error)
1588 goto bad;
1589
1590 *vpp = tvp;
1591 return (0);
1592
1593bad:
1594 /*
1595 * Write error occurred trying to update the inode
1596 * or the directory so must deallocate the inode.
1597 */
1598 ip->i_nlink = 0;
1599 ip->i_flag |= IN_CHANGE;
1600 vput(tvp);
1601 return (error);
1602}
1603
1604/*
1605 * Vnode op for reading.
1606 */
1607static int
1608ext2_read(struct vop_read_args *ap)
1609{
1610 struct vnode *vp;
1611 struct inode *ip;
1612 int error;
1613
1614 vp = ap->a_vp;
1615 ip = VTOI(vp);
1616
1617 /*EXT4_EXT_LOCK(ip);*/
1618 if (ip->i_flags & EXT4_EXTENTS)
1619 error = ext4_ext_read(ap);
1620 else
1621 error = ext2_ind_read(ap);
1622 /*EXT4_EXT_UNLOCK(ip);*/
1623 return (error);
1624}
1625
1626
1627/*
1628 * Vnode op for reading.
1629 */
1630static int
1631ext2_ind_read(struct vop_read_args *ap)
1632{
1633 struct vnode *vp;
1634 struct inode *ip;
1635 struct uio *uio;
1636 struct m_ext2fs *fs;
1637 struct buf *bp;
1638 daddr_t lbn, nextlbn;
1639 off_t bytesinfile;
1640 long size, xfersize, blkoffset;
1641 int error, orig_resid, seqcount;
1642 int ioflag;
1643
1644 vp = ap->a_vp;
1645 uio = ap->a_uio;
1646 ioflag = ap->a_ioflag;
1647
1648 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
1649 ip = VTOI(vp);
1650
1651#ifdef INVARIANTS
1652 if (uio->uio_rw != UIO_READ)
1653 panic("%s: mode", "ext2_read");
1654
1655 if (vp->v_type == VLNK) {
1656 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
1657 panic("%s: short symlink", "ext2_read");
1658 } else if (vp->v_type != VREG && vp->v_type != VDIR)
1659 panic("%s: type %d", "ext2_read", vp->v_type);
1660#endif
1661 orig_resid = uio->uio_resid;
1662 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
1663 if (orig_resid == 0)
1664 return (0);
1665 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
1666 fs = ip->i_e2fs;
1667 if (uio->uio_offset < ip->i_size &&
1668 uio->uio_offset >= fs->e2fs_maxfilesize)
1669 return (EOVERFLOW);
1670
1671 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
1672 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
1673 break;
1674 lbn = lblkno(fs, uio->uio_offset);
1675 nextlbn = lbn + 1;
1676 size = blksize(fs, ip, lbn);
1677 blkoffset = blkoff(fs, uio->uio_offset);
1678
1679 xfersize = fs->e2fs_fsize - blkoffset;
1680 if (uio->uio_resid < xfersize)
1681 xfersize = uio->uio_resid;
1682 if (bytesinfile < xfersize)
1683 xfersize = bytesinfile;
1684
1685 if (lblktosize(fs, nextlbn) >= ip->i_size)
1686 error = bread(vp, lbn, size, NOCRED, &bp);
1687 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
1688 error = cluster_read(vp, ip->i_size, lbn, size,
1689 NOCRED, blkoffset + uio->uio_resid, seqcount,
1690 0, &bp);
1691 } else if (seqcount > 1) {
|
1693 error = breadn(vp, lbn,
1694 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
1695 } else
1696 error = bread(vp, lbn, size, NOCRED, &bp);
1697 if (error) {
1698 brelse(bp);
1699 bp = NULL;
1700 break;
1701 }
1702
1703 /*
1704 * If IO_DIRECT then set B_DIRECT for the buffer. This
1705 * will cause us to attempt to release the buffer later on
1706 * and will cause the buffer cache to attempt to free the
1707 * underlying pages.
1708 */
1709 if (ioflag & IO_DIRECT)
1710 bp->b_flags |= B_DIRECT;
1711
1712 /*
1713 * We should only get non-zero b_resid when an I/O error
1714 * has occurred, which should cause us to break above.
1715 * However, if the short read did not cause an error,
1716 * then we want to ensure that we do not uiomove bad
1717 * or uninitialized data.
1718 */
1719 size -= bp->b_resid;
1720 if (size < xfersize) {
1721 if (size == 0)
1722 break;
1723 xfersize = size;
1724 }
1725 error = uiomove((char *)bp->b_data + blkoffset,
1726 (int)xfersize, uio);
1727 if (error)
1728 break;
1729
1730 if (ioflag & (IO_VMIO|IO_DIRECT)) {
1731 /*
1732 * If it's VMIO or direct I/O, then we don't
1733 * need the buf, mark it available for
1734 * freeing. If it's non-direct VMIO, the VM has
1735 * the data.
1736 */
1737 bp->b_flags |= B_RELBUF;
1738 brelse(bp);
1739 } else {
1740 /*
1741 * Otherwise let whoever
1742 * made the request take care of
1743 * freeing it. We just queue
1744 * it onto another list.
1745 */
1746 bqrelse(bp);
1747 }
1748 }
1749
1750 /*
1751 * This can only happen in the case of an error
1752 * because the loop above resets bp to NULL on each iteration
1753 * and on normal completion has not set a new value into it.
1754 * so it must have come from a 'break' statement
1755 */
1756 if (bp != NULL) {
1757 if (ioflag & (IO_VMIO|IO_DIRECT)) {
1758 bp->b_flags |= B_RELBUF;
1759 brelse(bp);
1760 } else {
1761 bqrelse(bp);
1762 }
1763 }
1764
1765 if ((error == 0 || uio->uio_resid != orig_resid) &&
1766 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
1767 ip->i_flag |= IN_ACCESS;
1768 return (error);
1769}
1770
1771static int
1772ext2_ioctl(struct vop_ioctl_args *ap)
1773{
1774
1775 switch (ap->a_command) {
1776 case FIOSEEKDATA:
1777 case FIOSEEKHOLE:
1778 return (vn_bmap_seekhole(ap->a_vp, ap->a_command,
1779 (off_t *)ap->a_data, ap->a_cred));
1780 default:
1781 return (ENOTTY);
1782 }
1783}
1784
1785/*
1786 * this function handles ext4 extents block mapping
1787 */
1788static int
1789ext4_ext_read(struct vop_read_args *ap)
1790{
1791 struct vnode *vp;
1792 struct inode *ip;
1793 struct uio *uio;
1794 struct m_ext2fs *fs;
1795 struct buf *bp;
1796 struct ext4_extent nex, *ep;
1797 struct ext4_extent_path path;
1798 daddr_t lbn, newblk;
1799 off_t bytesinfile;
1800 int cache_type;
1801 ssize_t orig_resid;
1802 int error;
1803 long size, xfersize, blkoffset;
1804
1805 vp = ap->a_vp;
1806 ip = VTOI(vp);
1807 uio = ap->a_uio;
1808 memset(&path, 0, sizeof(path));
1809
1810 orig_resid = uio->uio_resid;
1811 KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__));
1812 if (orig_resid == 0)
1813 return (0);
1814 KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__));
1815 fs = ip->i_e2fs;
1816 if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize)
1817 return (EOVERFLOW);
1818
1819 while (uio->uio_resid > 0) {
1820 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
1821 break;
1822 lbn = lblkno(fs, uio->uio_offset);
1823 size = blksize(fs, ip, lbn);
1824 blkoffset = blkoff(fs, uio->uio_offset);
1825
1826 xfersize = fs->e2fs_fsize - blkoffset;
1827 xfersize = MIN(xfersize, uio->uio_resid);
1828 xfersize = MIN(xfersize, bytesinfile);
1829
1830 /* get block from ext4 extent cache */
1831 cache_type = ext4_ext_in_cache(ip, lbn, &nex);
1832 switch (cache_type) {
1833 case EXT4_EXT_CACHE_NO:
1834 ext4_ext_find_extent(fs, ip, lbn, &path);
1835 ep = path.ep_ext;
1836 if (ep == NULL)
1837 return (EIO);
1838
1839 ext4_ext_put_cache(ip, ep, EXT4_EXT_CACHE_IN);
1840
1841 newblk = lbn - ep->e_blk + (ep->e_start_lo |
1842 (daddr_t)ep->e_start_hi << 32);
1843
1844 if (path.ep_bp != NULL) {
1845 brelse(path.ep_bp);
1846 path.ep_bp = NULL;
1847 }
1848 break;
1849
1850 case EXT4_EXT_CACHE_GAP:
1851 /* block has not been allocated yet */
1852 return (0);
1853
1854 case EXT4_EXT_CACHE_IN:
1855 newblk = lbn - nex.e_blk + (nex.e_start_lo |
1856 (daddr_t)nex.e_start_hi << 32);
1857 break;
1858
1859 default:
1860 panic("%s: invalid cache type", __func__);
1861 }
1862
1863 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size, NOCRED, &bp);
1864 if (error) {
1865 brelse(bp);
1866 return (error);
1867 }
1868
1869 size -= bp->b_resid;
1870 if (size < xfersize) {
1871 if (size == 0) {
1872 bqrelse(bp);
1873 break;
1874 }
1875 xfersize = size;
1876 }
1877 error = uiomove(bp->b_data + blkoffset, (int)xfersize, uio);
1878 bqrelse(bp);
1879 if (error)
1880 return (error);
1881 }
1882
1883 return (0);
1884}
1885
1886/*
1887 * Vnode op for writing.
1888 */
1889static int
1890ext2_write(struct vop_write_args *ap)
1891{
1892 struct vnode *vp;
1893 struct uio *uio;
1894 struct inode *ip;
1895 struct m_ext2fs *fs;
1896 struct buf *bp;
1897 daddr_t lbn;
1898 off_t osize;
1899 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
1900
1901 ioflag = ap->a_ioflag;
1902 uio = ap->a_uio;
1903 vp = ap->a_vp;
1904
1905 seqcount = ioflag >> IO_SEQSHIFT;
1906 ip = VTOI(vp);
1907
1908#ifdef INVARIANTS
1909 if (uio->uio_rw != UIO_WRITE)
1910 panic("%s: mode", "ext2_write");
1911#endif
1912
1913 switch (vp->v_type) {
1914 case VREG:
1915 if (ioflag & IO_APPEND)
1916 uio->uio_offset = ip->i_size;
1917 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
1918 return (EPERM);
1919 /* FALLTHROUGH */
1920 case VLNK:
1921 break;
1922 case VDIR:
1923 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
1924 if ((ioflag & IO_SYNC) == 0)
1925 panic("ext2_write: nonsync dir write");
1926 break;
1927 default:
1928 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
1929 vp->v_type, (intmax_t)uio->uio_offset,
1930 (intmax_t)uio->uio_resid);
1931 }
1932
1933 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
1934 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
1935 fs = ip->i_e2fs;
1936 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
1937 return (EFBIG);
1938 /*
1939 * Maybe this should be above the vnode op call, but so long as
1940 * file servers have no limits, I don't think it matters.
1941 */
1942 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
1943 return (EFBIG);
1944
1945 resid = uio->uio_resid;
1946 osize = ip->i_size;
1947 if (seqcount > BA_SEQMAX)
1948 flags = BA_SEQMAX << BA_SEQSHIFT;
1949 else
1950 flags = seqcount << BA_SEQSHIFT;
1951 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
1952 flags |= IO_SYNC;
1953
1954 for (error = 0; uio->uio_resid > 0;) {
1955 lbn = lblkno(fs, uio->uio_offset);
1956 blkoffset = blkoff(fs, uio->uio_offset);
1957 xfersize = fs->e2fs_fsize - blkoffset;
1958 if (uio->uio_resid < xfersize)
1959 xfersize = uio->uio_resid;
1960 if (uio->uio_offset + xfersize > ip->i_size)
1961 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
1962
1963 /*
1964 * We must perform a read-before-write if the transfer size
1965 * does not cover the entire buffer.
1966 */
1967 if (fs->e2fs_bsize > xfersize)
1968 flags |= BA_CLRBUF;
1969 else
1970 flags &= ~BA_CLRBUF;
1971 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
1972 ap->a_cred, &bp, flags);
1973 if (error != 0)
1974 break;
1975
1976 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL))
1977 bp->b_flags |= B_NOCACHE;
1978 if (uio->uio_offset + xfersize > ip->i_size)
1979 ip->i_size = uio->uio_offset + xfersize;
1980 size = blksize(fs, ip, lbn) - bp->b_resid;
1981 if (size < xfersize)
1982 xfersize = size;
1983
1984 error =
1985 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
1986 /*
1987 * If the buffer is not already filled and we encounter an
1988 * error while trying to fill it, we have to clear out any
1989 * garbage data from the pages instantiated for the buffer.
1990 * If we do not, a failed uiomove() during a write can leave
1991 * the prior contents of the pages exposed to a userland mmap.
1992 *
1993 * Note that we need only clear buffers with a transfer size
1994 * equal to the block size because buffers with a shorter
1995 * transfer size were cleared above by the call to ext2_balloc()
1996 * with the BA_CLRBUF flag set.
1997 *
1998 * If the source region for uiomove identically mmaps the
1999 * buffer, uiomove() performed the NOP copy, and the buffer
2000 * content remains valid because the page fault handler
2001 * validated the pages.
2002 */
2003 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
2004 fs->e2fs_bsize == xfersize)
2005 vfs_bio_clrbuf(bp);
2006 if (ioflag & (IO_VMIO|IO_DIRECT)) {
2007 bp->b_flags |= B_RELBUF;
2008 }
2009
2010 /*
2011 * If IO_SYNC each buffer is written synchronously. Otherwise
2012 * if we have a severe page deficiency write the buffer
2013 * asynchronously. Otherwise try to cluster, and if that
2014 * doesn't do it then either do an async write (if O_DIRECT),
2015 * or a delayed write (if not).
2016 */
2017 if (ioflag & IO_SYNC) {
2018 (void)bwrite(bp);
2019 } else if (vm_page_count_severe() ||
2020 buf_dirty_count_severe() ||
2021 (ioflag & IO_ASYNC)) {
2022 bp->b_flags |= B_CLUSTEROK;
2023 bawrite(bp);
2024 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
2025 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
2026 bp->b_flags |= B_CLUSTEROK;
2027 cluster_write(vp, bp, ip->i_size, seqcount, 0);
2028 } else {
2029 bawrite(bp);
2030 }
2031 } else if (ioflag & IO_DIRECT) {
2032 bp->b_flags |= B_CLUSTEROK;
2033 bawrite(bp);
2034 } else {
2035 bp->b_flags |= B_CLUSTEROK;
2036 bdwrite(bp);
2037 }
2038 if (error || xfersize == 0)
2039 break;
2040 }
2041 /*
2042 * If we successfully wrote any data, and we are not the superuser
2043 * we clear the setuid and setgid bits as a precaution against
2044 * tampering.
2045 */
2046 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
2047 ap->a_cred) {
2048 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
2049 ip->i_mode &= ~(ISUID | ISGID);
2050 }
2051 if (error) {
2052 if (ioflag & IO_UNIT) {
2053 (void)ext2_truncate(vp, osize,
2054 ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
2055 uio->uio_offset -= resid - uio->uio_resid;
2056 uio->uio_resid = resid;
2057 }
2058 }
2059 if (uio->uio_resid != resid) {
2060 ip->i_flag |= IN_CHANGE | IN_UPDATE;
2061 if (ioflag & IO_SYNC)
2062 error = ext2_update(vp, 1);
2063 }
2064 return (error);
2065}
| 1693 error = breadn(vp, lbn,
1694 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
1695 } else
1696 error = bread(vp, lbn, size, NOCRED, &bp);
1697 if (error) {
1698 brelse(bp);
1699 bp = NULL;
1700 break;
1701 }
1702
1703 /*
1704 * If IO_DIRECT then set B_DIRECT for the buffer. This
1705 * will cause us to attempt to release the buffer later on
1706 * and will cause the buffer cache to attempt to free the
1707 * underlying pages.
1708 */
1709 if (ioflag & IO_DIRECT)
1710 bp->b_flags |= B_DIRECT;
1711
1712 /*
1713 * We should only get non-zero b_resid when an I/O error
1714 * has occurred, which should cause us to break above.
1715 * However, if the short read did not cause an error,
1716 * then we want to ensure that we do not uiomove bad
1717 * or uninitialized data.
1718 */
1719 size -= bp->b_resid;
1720 if (size < xfersize) {
1721 if (size == 0)
1722 break;
1723 xfersize = size;
1724 }
1725 error = uiomove((char *)bp->b_data + blkoffset,
1726 (int)xfersize, uio);
1727 if (error)
1728 break;
1729
1730 if (ioflag & (IO_VMIO|IO_DIRECT)) {
1731 /*
1732 * If it's VMIO or direct I/O, then we don't
1733 * need the buf, mark it available for
1734 * freeing. If it's non-direct VMIO, the VM has
1735 * the data.
1736 */
1737 bp->b_flags |= B_RELBUF;
1738 brelse(bp);
1739 } else {
1740 /*
1741 * Otherwise let whoever
1742 * made the request take care of
1743 * freeing it. We just queue
1744 * it onto another list.
1745 */
1746 bqrelse(bp);
1747 }
1748 }
1749
1750 /*
1751 * This can only happen in the case of an error
1752 * because the loop above resets bp to NULL on each iteration
1753 * and on normal completion has not set a new value into it.
1754 * so it must have come from a 'break' statement
1755 */
1756 if (bp != NULL) {
1757 if (ioflag & (IO_VMIO|IO_DIRECT)) {
1758 bp->b_flags |= B_RELBUF;
1759 brelse(bp);
1760 } else {
1761 bqrelse(bp);
1762 }
1763 }
1764
1765 if ((error == 0 || uio->uio_resid != orig_resid) &&
1766 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
1767 ip->i_flag |= IN_ACCESS;
1768 return (error);
1769}
1770
1771static int
1772ext2_ioctl(struct vop_ioctl_args *ap)
1773{
1774
1775 switch (ap->a_command) {
1776 case FIOSEEKDATA:
1777 case FIOSEEKHOLE:
1778 return (vn_bmap_seekhole(ap->a_vp, ap->a_command,
1779 (off_t *)ap->a_data, ap->a_cred));
1780 default:
1781 return (ENOTTY);
1782 }
1783}
1784
1785/*
1786 * this function handles ext4 extents block mapping
1787 */
1788static int
1789ext4_ext_read(struct vop_read_args *ap)
1790{
1791 struct vnode *vp;
1792 struct inode *ip;
1793 struct uio *uio;
1794 struct m_ext2fs *fs;
1795 struct buf *bp;
1796 struct ext4_extent nex, *ep;
1797 struct ext4_extent_path path;
1798 daddr_t lbn, newblk;
1799 off_t bytesinfile;
1800 int cache_type;
1801 ssize_t orig_resid;
1802 int error;
1803 long size, xfersize, blkoffset;
1804
1805 vp = ap->a_vp;
1806 ip = VTOI(vp);
1807 uio = ap->a_uio;
1808 memset(&path, 0, sizeof(path));
1809
1810 orig_resid = uio->uio_resid;
1811 KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__));
1812 if (orig_resid == 0)
1813 return (0);
1814 KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__));
1815 fs = ip->i_e2fs;
1816 if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize)
1817 return (EOVERFLOW);
1818
1819 while (uio->uio_resid > 0) {
1820 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
1821 break;
1822 lbn = lblkno(fs, uio->uio_offset);
1823 size = blksize(fs, ip, lbn);
1824 blkoffset = blkoff(fs, uio->uio_offset);
1825
1826 xfersize = fs->e2fs_fsize - blkoffset;
1827 xfersize = MIN(xfersize, uio->uio_resid);
1828 xfersize = MIN(xfersize, bytesinfile);
1829
1830 /* get block from ext4 extent cache */
1831 cache_type = ext4_ext_in_cache(ip, lbn, &nex);
1832 switch (cache_type) {
1833 case EXT4_EXT_CACHE_NO:
1834 ext4_ext_find_extent(fs, ip, lbn, &path);
1835 ep = path.ep_ext;
1836 if (ep == NULL)
1837 return (EIO);
1838
1839 ext4_ext_put_cache(ip, ep, EXT4_EXT_CACHE_IN);
1840
1841 newblk = lbn - ep->e_blk + (ep->e_start_lo |
1842 (daddr_t)ep->e_start_hi << 32);
1843
1844 if (path.ep_bp != NULL) {
1845 brelse(path.ep_bp);
1846 path.ep_bp = NULL;
1847 }
1848 break;
1849
1850 case EXT4_EXT_CACHE_GAP:
1851 /* block has not been allocated yet */
1852 return (0);
1853
1854 case EXT4_EXT_CACHE_IN:
1855 newblk = lbn - nex.e_blk + (nex.e_start_lo |
1856 (daddr_t)nex.e_start_hi << 32);
1857 break;
1858
1859 default:
1860 panic("%s: invalid cache type", __func__);
1861 }
1862
1863 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size, NOCRED, &bp);
1864 if (error) {
1865 brelse(bp);
1866 return (error);
1867 }
1868
1869 size -= bp->b_resid;
1870 if (size < xfersize) {
1871 if (size == 0) {
1872 bqrelse(bp);
1873 break;
1874 }
1875 xfersize = size;
1876 }
1877 error = uiomove(bp->b_data + blkoffset, (int)xfersize, uio);
1878 bqrelse(bp);
1879 if (error)
1880 return (error);
1881 }
1882
1883 return (0);
1884}
1885
1886/*
1887 * Vnode op for writing.
1888 */
1889static int
1890ext2_write(struct vop_write_args *ap)
1891{
1892 struct vnode *vp;
1893 struct uio *uio;
1894 struct inode *ip;
1895 struct m_ext2fs *fs;
1896 struct buf *bp;
1897 daddr_t lbn;
1898 off_t osize;
1899 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
1900
1901 ioflag = ap->a_ioflag;
1902 uio = ap->a_uio;
1903 vp = ap->a_vp;
1904
1905 seqcount = ioflag >> IO_SEQSHIFT;
1906 ip = VTOI(vp);
1907
1908#ifdef INVARIANTS
1909 if (uio->uio_rw != UIO_WRITE)
1910 panic("%s: mode", "ext2_write");
1911#endif
1912
1913 switch (vp->v_type) {
1914 case VREG:
1915 if (ioflag & IO_APPEND)
1916 uio->uio_offset = ip->i_size;
1917 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
1918 return (EPERM);
1919 /* FALLTHROUGH */
1920 case VLNK:
1921 break;
1922 case VDIR:
1923 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
1924 if ((ioflag & IO_SYNC) == 0)
1925 panic("ext2_write: nonsync dir write");
1926 break;
1927 default:
1928 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
1929 vp->v_type, (intmax_t)uio->uio_offset,
1930 (intmax_t)uio->uio_resid);
1931 }
1932
1933 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
1934 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
1935 fs = ip->i_e2fs;
1936 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
1937 return (EFBIG);
1938 /*
1939 * Maybe this should be above the vnode op call, but so long as
1940 * file servers have no limits, I don't think it matters.
1941 */
1942 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
1943 return (EFBIG);
1944
1945 resid = uio->uio_resid;
1946 osize = ip->i_size;
1947 if (seqcount > BA_SEQMAX)
1948 flags = BA_SEQMAX << BA_SEQSHIFT;
1949 else
1950 flags = seqcount << BA_SEQSHIFT;
1951 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
1952 flags |= IO_SYNC;
1953
1954 for (error = 0; uio->uio_resid > 0;) {
1955 lbn = lblkno(fs, uio->uio_offset);
1956 blkoffset = blkoff(fs, uio->uio_offset);
1957 xfersize = fs->e2fs_fsize - blkoffset;
1958 if (uio->uio_resid < xfersize)
1959 xfersize = uio->uio_resid;
1960 if (uio->uio_offset + xfersize > ip->i_size)
1961 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
1962
1963 /*
1964 * We must perform a read-before-write if the transfer size
1965 * does not cover the entire buffer.
1966 */
1967 if (fs->e2fs_bsize > xfersize)
1968 flags |= BA_CLRBUF;
1969 else
1970 flags &= ~BA_CLRBUF;
1971 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
1972 ap->a_cred, &bp, flags);
1973 if (error != 0)
1974 break;
1975
1976 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL))
1977 bp->b_flags |= B_NOCACHE;
1978 if (uio->uio_offset + xfersize > ip->i_size)
1979 ip->i_size = uio->uio_offset + xfersize;
1980 size = blksize(fs, ip, lbn) - bp->b_resid;
1981 if (size < xfersize)
1982 xfersize = size;
1983
1984 error =
1985 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
1986 /*
1987 * If the buffer is not already filled and we encounter an
1988 * error while trying to fill it, we have to clear out any
1989 * garbage data from the pages instantiated for the buffer.
1990 * If we do not, a failed uiomove() during a write can leave
1991 * the prior contents of the pages exposed to a userland mmap.
1992 *
1993 * Note that we need only clear buffers with a transfer size
1994 * equal to the block size because buffers with a shorter
1995 * transfer size were cleared above by the call to ext2_balloc()
1996 * with the BA_CLRBUF flag set.
1997 *
1998 * If the source region for uiomove identically mmaps the
1999 * buffer, uiomove() performed the NOP copy, and the buffer
2000 * content remains valid because the page fault handler
2001 * validated the pages.
2002 */
2003 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
2004 fs->e2fs_bsize == xfersize)
2005 vfs_bio_clrbuf(bp);
2006 if (ioflag & (IO_VMIO|IO_DIRECT)) {
2007 bp->b_flags |= B_RELBUF;
2008 }
2009
2010 /*
2011 * If IO_SYNC each buffer is written synchronously. Otherwise
2012 * if we have a severe page deficiency write the buffer
2013 * asynchronously. Otherwise try to cluster, and if that
2014 * doesn't do it then either do an async write (if O_DIRECT),
2015 * or a delayed write (if not).
2016 */
2017 if (ioflag & IO_SYNC) {
2018 (void)bwrite(bp);
2019 } else if (vm_page_count_severe() ||
2020 buf_dirty_count_severe() ||
2021 (ioflag & IO_ASYNC)) {
2022 bp->b_flags |= B_CLUSTEROK;
2023 bawrite(bp);
2024 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
2025 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
2026 bp->b_flags |= B_CLUSTEROK;
2027 cluster_write(vp, bp, ip->i_size, seqcount, 0);
2028 } else {
2029 bawrite(bp);
2030 }
2031 } else if (ioflag & IO_DIRECT) {
2032 bp->b_flags |= B_CLUSTEROK;
2033 bawrite(bp);
2034 } else {
2035 bp->b_flags |= B_CLUSTEROK;
2036 bdwrite(bp);
2037 }
2038 if (error || xfersize == 0)
2039 break;
2040 }
2041 /*
2042 * If we successfully wrote any data, and we are not the superuser
2043 * we clear the setuid and setgid bits as a precaution against
2044 * tampering.
2045 */
2046 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
2047 ap->a_cred) {
2048 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
2049 ip->i_mode &= ~(ISUID | ISGID);
2050 }
2051 if (error) {
2052 if (ioflag & IO_UNIT) {
2053 (void)ext2_truncate(vp, osize,
2054 ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
2055 uio->uio_offset -= resid - uio->uio_resid;
2056 uio->uio_resid = resid;
2057 }
2058 }
2059 if (uio->uio_resid != resid) {
2060 ip->i_flag |= IN_CHANGE | IN_UPDATE;
2061 if (ioflag & IO_SYNC)
2062 error = ext2_update(vp, 1);
2063 }
2064 return (error);
2065}
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