2 * modified for EXT2FS support in Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
8 * Copyright (c) 1982, 1986, 1989, 1993
9 * The Regents of the University of California. All rights reserved.
10 * (c) UNIX System Laboratories, Inc.
11 * All or some portions of this file are derived from material licensed
12 * to the University of California by American Telephone and Telegraph
13 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
14 * the permission of UNIX System Laboratories, Inc.
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94
41 * @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
45 #include "opt_suiddir.h"
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/fcntl.h>
51 #include <sys/filio.h>
55 #include <sys/endian.h>
57 #include <sys/rwlock.h>
58 #include <sys/mount.h>
59 #include <sys/unistd.h>
61 #include <sys/vnode.h>
62 #include <sys/namei.h>
63 #include <sys/lockf.h>
64 #include <sys/event.h>
69 #include <vm/vm_param.h>
70 #include <vm/vm_extern.h>
71 #include <vm/vm_object.h>
72 #include <vm/vm_page.h>
73 #include <vm/vm_pager.h>
74 #include <vm/vnode_pager.h>
76 #include "opt_directio.h"
78 #include <ufs/ufs/dir.h>
80 #include <fs/ext2fs/fs.h>
81 #include <fs/ext2fs/inode.h>
82 #include <fs/ext2fs/ext2_extern.h>
83 #include <fs/ext2fs/ext2fs.h>
84 #include <fs/ext2fs/ext2_dinode.h>
85 #include <fs/ext2fs/ext2_dir.h>
86 #include <fs/ext2fs/ext2_mount.h>
88 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
89 static void ext2_itimes_locked(struct vnode *);
90 static int ext4_ext_read(struct vop_read_args *);
91 static int ext2_ind_read(struct vop_read_args *);
93 static vop_access_t ext2_access;
94 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
95 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
97 static vop_close_t ext2_close;
98 static vop_create_t ext2_create;
99 static vop_fsync_t ext2_fsync;
100 static vop_getattr_t ext2_getattr;
101 static vop_ioctl_t ext2_ioctl;
102 static vop_link_t ext2_link;
103 static vop_mkdir_t ext2_mkdir;
104 static vop_mknod_t ext2_mknod;
105 static vop_open_t ext2_open;
106 static vop_pathconf_t ext2_pathconf;
107 static vop_print_t ext2_print;
108 static vop_read_t ext2_read;
109 static vop_readlink_t ext2_readlink;
110 static vop_remove_t ext2_remove;
111 static vop_rename_t ext2_rename;
112 static vop_rmdir_t ext2_rmdir;
113 static vop_setattr_t ext2_setattr;
114 static vop_strategy_t ext2_strategy;
115 static vop_symlink_t ext2_symlink;
116 static vop_write_t ext2_write;
117 static vop_vptofh_t ext2_vptofh;
118 static vop_close_t ext2fifo_close;
119 static vop_kqfilter_t ext2fifo_kqfilter;
121 /* Global vfs data structures for ext2. */
122 struct vop_vector ext2_vnodeops = {
123 .vop_default = &default_vnodeops,
124 .vop_access = ext2_access,
125 .vop_bmap = ext2_bmap,
126 .vop_cachedlookup = ext2_lookup,
127 .vop_close = ext2_close,
128 .vop_create = ext2_create,
129 .vop_fsync = ext2_fsync,
130 .vop_getpages = vnode_pager_local_getpages,
131 .vop_getpages_async = vnode_pager_local_getpages_async,
132 .vop_getattr = ext2_getattr,
133 .vop_inactive = ext2_inactive,
134 .vop_ioctl = ext2_ioctl,
135 .vop_link = ext2_link,
136 .vop_lookup = vfs_cache_lookup,
137 .vop_mkdir = ext2_mkdir,
138 .vop_mknod = ext2_mknod,
139 .vop_open = ext2_open,
140 .vop_pathconf = ext2_pathconf,
141 .vop_poll = vop_stdpoll,
142 .vop_print = ext2_print,
143 .vop_read = ext2_read,
144 .vop_readdir = ext2_readdir,
145 .vop_readlink = ext2_readlink,
146 .vop_reallocblks = ext2_reallocblks,
147 .vop_reclaim = ext2_reclaim,
148 .vop_remove = ext2_remove,
149 .vop_rename = ext2_rename,
150 .vop_rmdir = ext2_rmdir,
151 .vop_setattr = ext2_setattr,
152 .vop_strategy = ext2_strategy,
153 .vop_symlink = ext2_symlink,
154 .vop_write = ext2_write,
155 .vop_vptofh = ext2_vptofh,
158 struct vop_vector ext2_fifoops = {
159 .vop_default = &fifo_specops,
160 .vop_access = ext2_access,
161 .vop_close = ext2fifo_close,
162 .vop_fsync = ext2_fsync,
163 .vop_getattr = ext2_getattr,
164 .vop_inactive = ext2_inactive,
165 .vop_kqfilter = ext2fifo_kqfilter,
166 .vop_print = ext2_print,
167 .vop_read = VOP_PANIC,
168 .vop_reclaim = ext2_reclaim,
169 .vop_setattr = ext2_setattr,
170 .vop_write = VOP_PANIC,
171 .vop_vptofh = ext2_vptofh,
175 * A virgin directory (no blushing please).
176 * Note that the type and namlen fields are reversed relative to ext2.
177 * Also, we don't use `struct odirtemplate', since it would just cause
178 * endianness problems.
180 static struct dirtemplate mastertemplate = {
181 0, 12, 1, EXT2_FT_DIR, ".",
182 0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
184 static struct dirtemplate omastertemplate = {
185 0, 12, 1, EXT2_FT_UNKNOWN, ".",
186 0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
190 ext2_itimes_locked(struct vnode *vp)
195 ASSERT_VI_LOCKED(vp, __func__);
198 if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
200 if ((vp->v_type == VBLK || vp->v_type == VCHR))
201 ip->i_flag |= IN_LAZYMOD;
203 ip->i_flag |= IN_MODIFIED;
204 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
206 if (ip->i_flag & IN_ACCESS) {
207 ip->i_atime = ts.tv_sec;
208 ip->i_atimensec = ts.tv_nsec;
210 if (ip->i_flag & IN_UPDATE) {
211 ip->i_mtime = ts.tv_sec;
212 ip->i_mtimensec = ts.tv_nsec;
215 if (ip->i_flag & IN_CHANGE) {
216 ip->i_ctime = ts.tv_sec;
217 ip->i_ctimensec = ts.tv_nsec;
220 ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
224 ext2_itimes(struct vnode *vp)
228 ext2_itimes_locked(vp);
233 * Create a regular file
236 ext2_create(struct vop_create_args *ap)
241 ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
242 ap->a_dvp, ap->a_vpp, ap->a_cnp);
245 if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0)
246 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp);
251 ext2_open(struct vop_open_args *ap)
254 if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
258 * Files marked append-only must be opened for appending.
260 if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
261 (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
264 vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
272 * Update the times on the inode.
275 ext2_close(struct vop_close_args *ap)
277 struct vnode *vp = ap->a_vp;
280 if (vp->v_usecount > 1)
281 ext2_itimes_locked(vp);
287 ext2_access(struct vop_access_args *ap)
289 struct vnode *vp = ap->a_vp;
290 struct inode *ip = VTOI(vp);
291 accmode_t accmode = ap->a_accmode;
294 if (vp->v_type == VBLK || vp->v_type == VCHR)
298 * Disallow write attempts on read-only file systems;
299 * unless the file is a socket, fifo, or a block or
300 * character device resident on the file system.
302 if (accmode & VWRITE) {
303 switch (vp->v_type) {
307 if (vp->v_mount->mnt_flag & MNT_RDONLY)
315 /* If immutable bit set, nobody gets to write it. */
316 if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT)))
319 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
320 ap->a_accmode, ap->a_cred, NULL);
325 ext2_getattr(struct vop_getattr_args *ap)
327 struct vnode *vp = ap->a_vp;
328 struct inode *ip = VTOI(vp);
329 struct vattr *vap = ap->a_vap;
333 * Copy from inode table
335 vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
336 vap->va_fileid = ip->i_number;
337 vap->va_mode = ip->i_mode & ~IFMT;
338 vap->va_nlink = ip->i_nlink;
339 vap->va_uid = ip->i_uid;
340 vap->va_gid = ip->i_gid;
341 vap->va_rdev = ip->i_rdev;
342 vap->va_size = ip->i_size;
343 vap->va_atime.tv_sec = ip->i_atime;
344 vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
345 vap->va_mtime.tv_sec = ip->i_mtime;
346 vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
347 vap->va_ctime.tv_sec = ip->i_ctime;
348 vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
349 if E2DI_HAS_XTIME(ip) {
350 vap->va_birthtime.tv_sec = ip->i_birthtime;
351 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
353 vap->va_flags = ip->i_flags;
354 vap->va_gen = ip->i_gen;
355 vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
356 vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
357 vap->va_type = IFTOVT(ip->i_mode);
358 vap->va_filerev = ip->i_modrev;
363 * Set attribute vnode op. called from several syscalls
366 ext2_setattr(struct vop_setattr_args *ap)
368 struct vattr *vap = ap->a_vap;
369 struct vnode *vp = ap->a_vp;
370 struct inode *ip = VTOI(vp);
371 struct ucred *cred = ap->a_cred;
372 struct thread *td = curthread;
376 * Check for unsettable attributes.
378 if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
379 (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
380 (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
381 ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
384 if (vap->va_flags != VNOVAL) {
385 /* Disallow flags not supported by ext2fs. */
386 if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
389 if (vp->v_mount->mnt_flag & MNT_RDONLY)
392 * Callers may only modify the file flags on objects they
393 * have VADMIN rights for.
395 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
398 * Unprivileged processes and privileged processes in
399 * jail() are not permitted to unset system flags, or
400 * modify flags if any system flags are set.
401 * Privileged non-jail processes may not modify system flags
402 * if securelevel > 0 and any existing system flags are set.
404 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
405 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
406 error = securelevel_gt(cred, 0);
411 if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
412 ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
415 ip->i_flags = vap->va_flags;
416 ip->i_flag |= IN_CHANGE;
417 if (ip->i_flags & (IMMUTABLE | APPEND))
420 if (ip->i_flags & (IMMUTABLE | APPEND))
423 * Go through the fields and update iff not VNOVAL.
425 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
426 if (vp->v_mount->mnt_flag & MNT_RDONLY)
428 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
432 if (vap->va_size != VNOVAL) {
434 * Disallow write attempts on read-only file systems;
435 * unless the file is a socket, fifo, or a block or
436 * character device resident on the file system.
438 switch (vp->v_type) {
443 if (vp->v_mount->mnt_flag & MNT_RDONLY)
449 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
452 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
453 if (vp->v_mount->mnt_flag & MNT_RDONLY)
457 * If times is NULL, ... The caller must be the owner of
458 * the file, have permission to write the file, or be the
460 * If times is non-NULL, ... The caller must be the owner of
461 * the file or be the super-user.
463 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
464 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
465 (error = VOP_ACCESS(vp, VWRITE, cred, td))))
467 ip->i_flag |= IN_CHANGE | IN_MODIFIED;
468 if (vap->va_atime.tv_sec != VNOVAL) {
469 ip->i_flag &= ~IN_ACCESS;
470 ip->i_atime = vap->va_atime.tv_sec;
471 ip->i_atimensec = vap->va_atime.tv_nsec;
473 if (vap->va_mtime.tv_sec != VNOVAL) {
474 ip->i_flag &= ~IN_UPDATE;
475 ip->i_mtime = vap->va_mtime.tv_sec;
476 ip->i_mtimensec = vap->va_mtime.tv_nsec;
478 ip->i_birthtime = vap->va_birthtime.tv_sec;
479 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
480 error = ext2_update(vp, 0);
485 if (vap->va_mode != (mode_t)VNOVAL) {
486 if (vp->v_mount->mnt_flag & MNT_RDONLY)
488 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
494 * Change the mode on a file.
495 * Inode must be locked before calling.
498 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
500 struct inode *ip = VTOI(vp);
504 * To modify the permissions on a file, must possess VADMIN
507 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
510 * Privileged processes may set the sticky bit on non-directories,
511 * as well as set the setgid bit on a file with a group that the
512 * process is not a member of.
514 if (vp->v_type != VDIR && (mode & S_ISTXT)) {
515 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0);
519 if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
520 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
524 ip->i_mode &= ~ALLPERMS;
525 ip->i_mode |= (mode & ALLPERMS);
526 ip->i_flag |= IN_CHANGE;
531 * Perform chown operation on inode ip;
532 * inode must be locked prior to call.
535 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
538 struct inode *ip = VTOI(vp);
543 if (uid == (uid_t)VNOVAL)
545 if (gid == (gid_t)VNOVAL)
548 * To modify the ownership of a file, must possess VADMIN
551 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
554 * To change the owner of a file, or change the group of a file
555 * to a group of which we are not a member, the caller must
558 if (uid != ip->i_uid || (gid != ip->i_gid &&
559 !groupmember(gid, cred))) {
560 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
568 ip->i_flag |= IN_CHANGE;
569 if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
570 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0)
571 ip->i_mode &= ~(ISUID | ISGID);
577 * Synch an open file.
581 ext2_fsync(struct vop_fsync_args *ap)
584 * Flush all dirty buffers associated with a vnode.
589 return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
597 ext2_mknod(struct vop_mknod_args *ap)
599 struct vattr *vap = ap->a_vap;
600 struct vnode **vpp = ap->a_vpp;
605 error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
606 ap->a_dvp, vpp, ap->a_cnp);
610 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
611 if (vap->va_rdev != VNOVAL) {
613 * Want to be able to use this to make badblock
614 * inodes, so don't truncate the dev number.
616 ip->i_rdev = vap->va_rdev;
619 * Remove inode, then reload it through VFS_VGET so it is
620 * checked to see if it is an alias of an existing entry in
621 * the inode cache. XXX I don't believe this is necessary now.
623 (*vpp)->v_type = VNON;
624 ino = ip->i_number; /* Save this before vgone() invalidates ip. */
627 error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
636 ext2_remove(struct vop_remove_args *ap)
639 struct vnode *vp = ap->a_vp;
640 struct vnode *dvp = ap->a_dvp;
644 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
645 (VTOI(dvp)->i_flags & APPEND)) {
649 error = ext2_dirremove(dvp, ap->a_cnp);
652 ip->i_flag |= IN_CHANGE;
662 ext2_link(struct vop_link_args *ap)
664 struct vnode *vp = ap->a_vp;
665 struct vnode *tdvp = ap->a_tdvp;
666 struct componentname *cnp = ap->a_cnp;
671 if ((cnp->cn_flags & HASBUF) == 0)
672 panic("ext2_link: no name");
675 if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) {
679 if (ip->i_flags & (IMMUTABLE | APPEND)) {
684 ip->i_flag |= IN_CHANGE;
685 error = ext2_update(vp, !DOINGASYNC(vp));
687 error = ext2_direnter(ip, tdvp, cnp);
690 ip->i_flag |= IN_CHANGE;
697 * Rename system call.
698 * rename("foo", "bar");
701 * link("foo", "bar");
703 * but ``atomically''. Can't do full commit without saving state in the
704 * inode on disk which isn't feasible at this time. Best we can do is
705 * always guarantee the target exists.
707 * Basic algorithm is:
709 * 1) Bump link count on source while we're linking it to the
710 * target. This also ensure the inode won't be deleted out
711 * from underneath us while we work (it may be truncated by
712 * a concurrent `trunc' or `open' for creation).
713 * 2) Link source to destination. If destination already exists,
715 * 3) Unlink source reference to inode if still around. If a
716 * directory was moved and the parent of the destination
717 * is different from the source, patch the ".." entry in the
721 ext2_rename(struct vop_rename_args *ap)
723 struct vnode *tvp = ap->a_tvp;
724 struct vnode *tdvp = ap->a_tdvp;
725 struct vnode *fvp = ap->a_fvp;
726 struct vnode *fdvp = ap->a_fdvp;
727 struct componentname *tcnp = ap->a_tcnp;
728 struct componentname *fcnp = ap->a_fcnp;
729 struct inode *ip, *xp, *dp;
730 struct dirtemplate dirbuf;
731 int doingdirectory = 0, oldparent = 0, newparent = 0;
736 if ((tcnp->cn_flags & HASBUF) == 0 ||
737 (fcnp->cn_flags & HASBUF) == 0)
738 panic("ext2_rename: no name");
741 * Check for cross-device rename.
743 if ((fvp->v_mount != tdvp->v_mount) ||
744 (tvp && (fvp->v_mount != tvp->v_mount))) {
758 if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
759 (VTOI(tdvp)->i_flags & APPEND))) {
765 * Renaming a file to itself has no effect. The upper layers should
766 * not call us in that case. Temporarily just warn if they do.
769 printf("ext2_rename: fvp == tvp (can't happen)\n");
774 if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
778 if (ip->i_nlink >= EXT2_LINK_MAX) {
783 if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
784 || (dp->i_flags & APPEND)) {
789 if ((ip->i_mode & IFMT) == IFDIR) {
791 * Avoid ".", "..", and aliases of "." for obvious reasons.
793 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
794 dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
795 (ip->i_flag & IN_RENAME)) {
800 ip->i_flag |= IN_RENAME;
801 oldparent = dp->i_number;
807 * When the target exists, both the directory
808 * and target vnodes are returned locked.
816 * 1) Bump link count while we're moving stuff
817 * around. If we crash somewhere before
818 * completing our work, the link count
819 * may be wrong, but correctable.
822 ip->i_flag |= IN_CHANGE;
823 if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
829 * If ".." must be changed (ie the directory gets a new
830 * parent) then the source directory must not be in the
831 * directory hierarchy above the target, as this would
832 * orphan everything below the source directory. Also
833 * the user must have write permission in the source so
834 * as to be able to change "..". We must repeat the call
835 * to namei, as the parent directory is unlocked by the
836 * call to checkpath().
838 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
840 if (oldparent != dp->i_number)
841 newparent = dp->i_number;
842 if (doingdirectory && newparent) {
843 if (error) /* write access check above */
847 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
851 error = relookup(tdvp, &tvp, tcnp);
861 * 2) If target doesn't exist, link the target
862 * to the source and unlink the source.
863 * Otherwise, rewrite the target directory
864 * entry to reference the source inode and
865 * expunge the original entry's existence.
868 if (dp->i_devvp != ip->i_devvp)
869 panic("ext2_rename: EXDEV");
871 * Account for ".." in new directory.
872 * When source and destination have the same
873 * parent we don't fool with the link count.
875 if (doingdirectory && newparent) {
876 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) {
881 dp->i_flag |= IN_CHANGE;
882 error = ext2_update(tdvp, !DOINGASYNC(tdvp));
886 error = ext2_direnter(ip, tdvp, tcnp);
888 if (doingdirectory && newparent) {
890 dp->i_flag |= IN_CHANGE;
891 (void)ext2_update(tdvp, 1);
897 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
898 panic("ext2_rename: EXDEV");
900 * Short circuit rename(foo, foo).
902 if (xp->i_number == ip->i_number)
903 panic("ext2_rename: same file");
905 * If the parent directory is "sticky", then the user must
906 * own the parent directory, or the destination of the rename,
907 * otherwise the destination may not be changed (except by
908 * root). This implements append-only directories.
910 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
911 tcnp->cn_cred->cr_uid != dp->i_uid &&
912 xp->i_uid != tcnp->cn_cred->cr_uid) {
917 * Target must be empty if a directory and have no links
918 * to it. Also, ensure source and target are compatible
919 * (both directories, or both not directories).
921 if ((xp->i_mode&IFMT) == IFDIR) {
922 if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
927 if (!doingdirectory) {
932 } else if (doingdirectory) {
936 error = ext2_dirrewrite(dp, ip, tcnp);
940 * If the target directory is in the same
941 * directory as the source directory,
942 * decrement the link count on the parent
943 * of the target directory.
945 if (doingdirectory && !newparent) {
947 dp->i_flag |= IN_CHANGE;
951 * Adjust the link count of the target to
952 * reflect the dirrewrite above. If this is
953 * a directory it is empty and there are
954 * no links to it, so we can squash the inode and
955 * any space associated with it. We disallowed
956 * renaming over top of a directory with links to
957 * it above, as the remaining link would point to
958 * a directory without "." or ".." entries.
961 if (doingdirectory) {
962 if (--xp->i_nlink != 0)
963 panic("ext2_rename: linked directory");
964 error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
965 tcnp->cn_cred, tcnp->cn_thread);
967 xp->i_flag |= IN_CHANGE;
973 * 3) Unlink the source.
975 fcnp->cn_flags &= ~MODMASK;
976 fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
978 error = relookup(fdvp, &fvp, fcnp);
986 * From name has disappeared. IN_RENAME is not sufficient
987 * to protect against directory races due to timing windows,
988 * so we can't panic here.
994 * Ensure that the directory entry still exists and has not
995 * changed while the new name has been entered. If the source is
996 * a file then the entry may have been unlinked or renamed. In
997 * either case there is no further work to be done. If the source
998 * is a directory then it cannot have been rmdir'ed; its link
999 * count of three would cause a rmdir to fail with ENOTEMPTY.
1000 * The IN_RENAME flag ensures that it cannot be moved by another
1005 * From name resolves to a different inode. IN_RENAME is
1006 * not sufficient protection against timing window races
1007 * so we can't panic here.
1011 * If the source is a directory with a
1012 * new parent, the link count of the old
1013 * parent directory must be decremented
1014 * and ".." set to point to the new parent.
1016 if (doingdirectory && newparent) {
1018 dp->i_flag |= IN_CHANGE;
1019 error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
1020 sizeof(struct dirtemplate), (off_t)0,
1021 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1022 tcnp->cn_cred, NOCRED, NULL, NULL);
1024 /* Like ufs little-endian: */
1025 namlen = dirbuf.dotdot_type;
1027 dirbuf.dotdot_name[0] != '.' ||
1028 dirbuf.dotdot_name[1] != '.') {
1029 ext2_dirbad(xp, (doff_t)12,
1030 "rename: mangled dir");
1032 dirbuf.dotdot_ino = newparent;
1033 (void) vn_rdwr(UIO_WRITE, fvp,
1035 sizeof(struct dirtemplate),
1036 (off_t)0, UIO_SYSSPACE,
1037 IO_NODELOCKED | IO_SYNC |
1038 IO_NOMACCHECK, tcnp->cn_cred,
1039 NOCRED, NULL, NULL);
1044 error = ext2_dirremove(fdvp, fcnp);
1047 xp->i_flag |= IN_CHANGE;
1049 xp->i_flag &= ~IN_RENAME;
1064 ip->i_flag &= ~IN_RENAME;
1065 if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
1067 ip->i_flag |= IN_CHANGE;
1068 ip->i_flag &= ~IN_RENAME;
1079 ext2_mkdir(struct vop_mkdir_args *ap)
1081 struct vnode *dvp = ap->a_dvp;
1082 struct vattr *vap = ap->a_vap;
1083 struct componentname *cnp = ap->a_cnp;
1084 struct inode *ip, *dp;
1086 struct dirtemplate dirtemplate, *dtp;
1090 if ((cnp->cn_flags & HASBUF) == 0)
1091 panic("ext2_mkdir: no name");
1094 if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) {
1098 dmode = vap->va_mode & 0777;
1101 * Must simulate part of ext2_makeinode here to acquire the inode,
1102 * but not have it entered in the parent directory. The entry is
1103 * made later after writing "." and ".." entries.
1105 error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
1109 ip->i_gid = dp->i_gid;
1113 * if we are hacking owners here, (only do this where told to)
1114 * and we are not giving it TOO root, (would subvert quotas)
1115 * then go ahead and give it to the other user.
1116 * The new directory also inherits the SUID bit.
1117 * If user's UID and dir UID are the same,
1118 * 'give it away' so that the SUID is still forced on.
1120 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1121 (dp->i_mode & ISUID) && dp->i_uid) {
1123 ip->i_uid = dp->i_uid;
1125 ip->i_uid = cnp->cn_cred->cr_uid;
1129 ip->i_uid = cnp->cn_cred->cr_uid;
1131 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1133 tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
1135 if (cnp->cn_flags & ISWHITEOUT)
1136 ip->i_flags |= UF_OPAQUE;
1137 error = ext2_update(tvp, 1);
1140 * Bump link count in parent directory
1141 * to reflect work done below. Should
1142 * be done before reference is created
1143 * so reparation is possible if we crash.
1146 dp->i_flag |= IN_CHANGE;
1147 error = ext2_update(dvp, !DOINGASYNC(dvp));
1151 /* Initialize directory with "." and ".." from static template. */
1152 if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
1153 EXT2F_INCOMPAT_FTYPE))
1154 dtp = &mastertemplate;
1156 dtp = &omastertemplate;
1158 dirtemplate.dot_ino = ip->i_number;
1159 dirtemplate.dotdot_ino = dp->i_number;
1160 /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE
1161 * so let's just redefine it - for this function only
1164 #define DIRBLKSIZ VTOI(dvp)->i_e2fs->e2fs_bsize
1165 dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
1166 error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
1167 sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE,
1168 IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
1172 dp->i_flag |= IN_CHANGE;
1175 if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
1176 /* XXX should grow with balloc() */
1177 panic("ext2_mkdir: blksize");
1179 ip->i_size = DIRBLKSIZ;
1180 ip->i_flag |= IN_CHANGE;
1183 /* Directory set up, now install its entry in the parent directory. */
1184 error = ext2_direnter(ip, dvp, cnp);
1187 dp->i_flag |= IN_CHANGE;
1191 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
1192 * for us because we set the link count to 0.
1196 ip->i_flag |= IN_CHANGE;
1203 #define DIRBLKSIZ DEV_BSIZE
1207 * Rmdir system call.
1210 ext2_rmdir(struct vop_rmdir_args *ap)
1212 struct vnode *vp = ap->a_vp;
1213 struct vnode *dvp = ap->a_dvp;
1214 struct componentname *cnp = ap->a_cnp;
1215 struct inode *ip, *dp;
1222 * Verify the directory is empty (and valid).
1223 * (Rmdir ".." won't be valid since
1224 * ".." will contain a reference to
1225 * the current directory and thus be
1228 if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
1232 if ((dp->i_flags & APPEND)
1233 || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1238 * Delete reference to directory before purging
1239 * inode. If we crash in between, the directory
1240 * will be reattached to lost+found,
1242 error = ext2_dirremove(dvp, cnp);
1246 dp->i_flag |= IN_CHANGE;
1250 * Truncate inode. The only stuff left
1251 * in the directory is "." and "..". The
1252 * "." reference is inconsequential since
1253 * we're quashing it. The ".." reference
1254 * has already been adjusted above. We've
1255 * removed the "." reference and the reference
1256 * in the parent directory, but there may be
1257 * other hard links so decrement by 2 and
1258 * worry about them later.
1261 error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
1263 cache_purge(ITOV(ip));
1264 if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1266 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1267 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1274 * symlink -- make a symbolic link
1277 ext2_symlink(struct vop_symlink_args *ap)
1279 struct vnode *vp, **vpp = ap->a_vpp;
1283 error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
1288 len = strlen(ap->a_target);
1289 if (len < vp->v_mount->mnt_maxsymlinklen) {
1291 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
1293 ip->i_flag |= IN_CHANGE | IN_UPDATE;
1295 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
1296 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
1297 ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
1304 * Return target name of a symbolic link
1307 ext2_readlink(struct vop_readlink_args *ap)
1309 struct vnode *vp = ap->a_vp;
1310 struct inode *ip = VTOI(vp);
1314 if (isize < vp->v_mount->mnt_maxsymlinklen) {
1315 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
1318 return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
1322 * Calculate the logical to physical mapping if not done already,
1323 * then call the device strategy routine.
1325 * In order to be able to swap to a file, the ext2_bmaparray() operation may not
1326 * deadlock on memory. See ext2_bmap() for details.
1329 ext2_strategy(struct vop_strategy_args *ap)
1331 struct buf *bp = ap->a_bp;
1332 struct vnode *vp = ap->a_vp;
1337 if (vp->v_type == VBLK || vp->v_type == VCHR)
1338 panic("ext2_strategy: spec");
1339 if (bp->b_blkno == bp->b_lblkno) {
1340 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
1341 bp->b_blkno = blkno;
1343 bp->b_error = error;
1344 bp->b_ioflags |= BIO_ERROR;
1348 if ((long)bp->b_blkno == -1)
1351 if ((long)bp->b_blkno == -1) {
1355 bp->b_iooffset = dbtob(bp->b_blkno);
1356 bo = VFSTOEXT2(vp->v_mount)->um_bo;
1357 BO_STRATEGY(bo, bp);
1362 * Print out the contents of an inode.
1365 ext2_print(struct vop_print_args *ap)
1367 struct vnode *vp = ap->a_vp;
1368 struct inode *ip = VTOI(vp);
1370 vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number);
1371 if (vp->v_type == VFIFO)
1378 * Close wrapper for fifos.
1380 * Update the times on the inode then do device close.
1383 ext2fifo_close(struct vop_close_args *ap)
1385 struct vnode *vp = ap->a_vp;
1388 if (vp->v_usecount > 1)
1389 ext2_itimes_locked(vp);
1391 return (fifo_specops.vop_close(ap));
1395 * Kqfilter wrapper for fifos.
1397 * Fall through to ext2 kqfilter routines if needed
1400 ext2fifo_kqfilter(struct vop_kqfilter_args *ap)
1404 error = fifo_specops.vop_kqfilter(ap);
1406 error = vfs_kqfilter(ap);
1411 * Return POSIX pathconf information applicable to ext2 filesystems.
1414 ext2_pathconf(struct vop_pathconf_args *ap)
1418 switch (ap->a_name) {
1420 *ap->a_retval = EXT2_LINK_MAX;
1423 *ap->a_retval = NAME_MAX;
1426 *ap->a_retval = PATH_MAX;
1429 *ap->a_retval = PIPE_BUF;
1431 case _PC_CHOWN_RESTRICTED:
1437 case _PC_MIN_HOLE_SIZE:
1438 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1441 /* _PC_ASYNC_IO should have been handled by upper layers. */
1442 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
1451 case _PC_ALLOC_SIZE_MIN:
1452 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
1454 case _PC_FILESIZEBITS:
1457 case _PC_REC_INCR_XFER_SIZE:
1458 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1460 case _PC_REC_MAX_XFER_SIZE:
1461 *ap->a_retval = -1; /* means ``unlimited'' */
1463 case _PC_REC_MIN_XFER_SIZE:
1464 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
1466 case _PC_REC_XFER_ALIGN:
1467 *ap->a_retval = PAGE_SIZE;
1469 case _PC_SYMLINK_MAX:
1470 *ap->a_retval = MAXPATHLEN;
1481 * Vnode pointer to File handle
1485 ext2_vptofh(struct vop_vptofh_args *ap)
1490 ip = VTOI(ap->a_vp);
1491 ufhp = (struct ufid *)ap->a_fhp;
1492 ufhp->ufid_len = sizeof(struct ufid);
1493 ufhp->ufid_ino = ip->i_number;
1494 ufhp->ufid_gen = ip->i_gen;
1499 * Initialize the vnode associated with a new inode, handle aliased
1503 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
1510 vp->v_type = IFTOVT(ip->i_mode);
1511 if (vp->v_type == VFIFO)
1514 if (ip->i_number == EXT2_ROOTINO)
1515 vp->v_vflag |= VV_ROOT;
1516 ip->i_modrev = init_va_filerev();
1522 * Allocate a new inode.
1525 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
1526 struct componentname *cnp)
1528 struct inode *ip, *pdir;
1534 if ((cnp->cn_flags & HASBUF) == 0)
1535 panic("ext2_makeinode: no name");
1538 if ((mode & IFMT) == 0)
1541 error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
1546 ip->i_gid = pdir->i_gid;
1551 * not the owner of the directory,
1552 * and we are hacking owners here, (only do this where told to)
1553 * and we are not giving it TOO root, (would subvert quotas)
1554 * then go ahead and give it to the other user.
1555 * Note that this drops off the execute bits for security.
1557 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
1558 (pdir->i_mode & ISUID) &&
1559 (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
1560 ip->i_uid = pdir->i_uid;
1563 ip->i_uid = cnp->cn_cred->cr_uid;
1567 ip->i_uid = cnp->cn_cred->cr_uid;
1569 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
1571 tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
1573 if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
1574 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0))
1575 ip->i_mode &= ~ISGID;
1578 if (cnp->cn_flags & ISWHITEOUT)
1579 ip->i_flags |= UF_OPAQUE;
1582 * Make sure inode goes to disk before directory entry.
1584 error = ext2_update(tvp, !DOINGASYNC(tvp));
1587 error = ext2_direnter(ip, dvp, cnp);
1596 * Write error occurred trying to update the inode
1597 * or the directory so must deallocate the inode.
1600 ip->i_flag |= IN_CHANGE;
1606 * Vnode op for reading.
1609 ext2_read(struct vop_read_args *ap)
1618 /*EXT4_EXT_LOCK(ip);*/
1619 if (ip->i_flag & IN_E4EXTENTS)
1620 error = ext4_ext_read(ap);
1622 error = ext2_ind_read(ap);
1623 /*EXT4_EXT_UNLOCK(ip);*/
1628 * Vnode op for reading.
1631 ext2_ind_read(struct vop_read_args *ap)
1636 struct m_ext2fs *fs;
1638 daddr_t lbn, nextlbn;
1640 long size, xfersize, blkoffset;
1641 int error, orig_resid, seqcount;
1646 ioflag = ap->a_ioflag;
1648 seqcount = ap->a_ioflag >> IO_SEQSHIFT;
1652 if (uio->uio_rw != UIO_READ)
1653 panic("%s: mode", "ext2_read");
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);
1661 orig_resid = uio->uio_resid;
1662 KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
1663 if (orig_resid == 0)
1665 KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
1667 if (uio->uio_offset < ip->i_size &&
1668 uio->uio_offset >= fs->e2fs_maxfilesize)
1671 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
1672 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
1674 lbn = lblkno(fs, uio->uio_offset);
1676 size = blksize(fs, ip, lbn);
1677 blkoffset = blkoff(fs, uio->uio_offset);
1679 xfersize = fs->e2fs_fsize - blkoffset;
1680 if (uio->uio_resid < xfersize)
1681 xfersize = uio->uio_resid;
1682 if (bytesinfile < xfersize)
1683 xfersize = bytesinfile;
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,
1691 } else if (seqcount > 1) {
1692 u_int nextsize = blksize(fs, ip, nextlbn);
1693 error = breadn(vp, lbn,
1694 size, &nextlbn, &nextsize, 1, NOCRED, &bp);
1696 error = bread(vp, lbn, size, NOCRED, &bp);
1704 * We should only get non-zero b_resid when an I/O error
1705 * has occurred, which should cause us to break above.
1706 * However, if the short read did not cause an error,
1707 * then we want to ensure that we do not uiomove bad
1708 * or uninitialized data.
1710 size -= bp->b_resid;
1711 if (size < xfersize) {
1716 error = uiomove((char *)bp->b_data + blkoffset,
1717 (int)xfersize, uio);
1720 vfs_bio_brelse(bp, ioflag);
1724 * This can only happen in the case of an error
1725 * because the loop above resets bp to NULL on each iteration
1726 * and on normal completion has not set a new value into it.
1727 * so it must have come from a 'break' statement
1730 vfs_bio_brelse(bp, ioflag);
1732 if ((error == 0 || uio->uio_resid != orig_resid) &&
1733 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
1734 ip->i_flag |= IN_ACCESS;
1739 ext2_ioctl(struct vop_ioctl_args *ap)
1742 switch (ap->a_command) {
1745 return (vn_bmap_seekhole(ap->a_vp, ap->a_command,
1746 (off_t *)ap->a_data, ap->a_cred));
1753 * this function handles ext4 extents block mapping
1756 ext4_ext_read(struct vop_read_args *ap)
1758 static unsigned char zeroes[EXT2_MAX_BLOCK_SIZE];
1762 struct m_ext2fs *fs;
1764 struct ext4_extent nex, *ep;
1765 struct ext4_extent_path path;
1766 daddr_t lbn, newblk;
1771 long size, xfersize, blkoffset;
1776 memset(&path, 0, sizeof(path));
1778 orig_resid = uio->uio_resid;
1779 KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__));
1780 if (orig_resid == 0)
1782 KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__));
1784 if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize)
1787 while (uio->uio_resid > 0) {
1788 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
1790 lbn = lblkno(fs, uio->uio_offset);
1791 size = blksize(fs, ip, lbn);
1792 blkoffset = blkoff(fs, uio->uio_offset);
1794 xfersize = fs->e2fs_fsize - blkoffset;
1795 xfersize = MIN(xfersize, uio->uio_resid);
1796 xfersize = MIN(xfersize, bytesinfile);
1798 /* get block from ext4 extent cache */
1799 cache_type = ext4_ext_in_cache(ip, lbn, &nex);
1800 switch (cache_type) {
1801 case EXT4_EXT_CACHE_NO:
1802 ext4_ext_find_extent(fs, ip, lbn, &path);
1803 if (path.ep_is_sparse)
1804 ep = &path.ep_sparse_ext;
1810 ext4_ext_put_cache(ip, ep,
1811 path.ep_is_sparse ? EXT4_EXT_CACHE_GAP : EXT4_EXT_CACHE_IN);
1813 newblk = lbn - ep->e_blk + (ep->e_start_lo |
1814 (daddr_t)ep->e_start_hi << 32);
1816 if (path.ep_bp != NULL) {
1822 case EXT4_EXT_CACHE_GAP:
1823 /* block has not been allocated yet */
1826 case EXT4_EXT_CACHE_IN:
1827 newblk = lbn - nex.e_blk + (nex.e_start_lo |
1828 (daddr_t)nex.e_start_hi << 32);
1832 panic("%s: invalid cache type", __func__);
1835 if (cache_type == EXT4_EXT_CACHE_GAP ||
1836 (cache_type == EXT4_EXT_CACHE_NO && path.ep_is_sparse)) {
1837 if (xfersize > sizeof(zeroes))
1838 xfersize = sizeof(zeroes);
1839 error = uiomove(zeroes, xfersize, uio);
1843 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size,
1850 size -= bp->b_resid;
1851 if (size < xfersize) {
1858 error = uiomove(bp->b_data + blkoffset, xfersize, uio);
1869 * Vnode op for writing.
1872 ext2_write(struct vop_write_args *ap)
1877 struct m_ext2fs *fs;
1881 int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
1883 ioflag = ap->a_ioflag;
1887 seqcount = ioflag >> IO_SEQSHIFT;
1891 if (uio->uio_rw != UIO_WRITE)
1892 panic("%s: mode", "ext2_write");
1895 switch (vp->v_type) {
1897 if (ioflag & IO_APPEND)
1898 uio->uio_offset = ip->i_size;
1899 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
1905 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
1906 if ((ioflag & IO_SYNC) == 0)
1907 panic("ext2_write: nonsync dir write");
1910 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
1911 vp->v_type, (intmax_t)uio->uio_offset,
1912 (intmax_t)uio->uio_resid);
1915 KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
1916 KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
1918 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
1921 * Maybe this should be above the vnode op call, but so long as
1922 * file servers have no limits, I don't think it matters.
1924 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
1927 resid = uio->uio_resid;
1929 if (seqcount > BA_SEQMAX)
1930 flags = BA_SEQMAX << BA_SEQSHIFT;
1932 flags = seqcount << BA_SEQSHIFT;
1933 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
1936 for (error = 0; uio->uio_resid > 0;) {
1937 lbn = lblkno(fs, uio->uio_offset);
1938 blkoffset = blkoff(fs, uio->uio_offset);
1939 xfersize = fs->e2fs_fsize - blkoffset;
1940 if (uio->uio_resid < xfersize)
1941 xfersize = uio->uio_resid;
1942 if (uio->uio_offset + xfersize > ip->i_size)
1943 vnode_pager_setsize(vp, uio->uio_offset + xfersize);
1946 * We must perform a read-before-write if the transfer size
1947 * does not cover the entire buffer.
1949 if (fs->e2fs_bsize > xfersize)
1952 flags &= ~BA_CLRBUF;
1953 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
1954 ap->a_cred, &bp, flags);
1958 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL))
1959 bp->b_flags |= B_NOCACHE;
1960 if (uio->uio_offset + xfersize > ip->i_size)
1961 ip->i_size = uio->uio_offset + xfersize;
1962 size = blksize(fs, ip, lbn) - bp->b_resid;
1963 if (size < xfersize)
1967 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
1969 * If the buffer is not already filled and we encounter an
1970 * error while trying to fill it, we have to clear out any
1971 * garbage data from the pages instantiated for the buffer.
1972 * If we do not, a failed uiomove() during a write can leave
1973 * the prior contents of the pages exposed to a userland mmap.
1975 * Note that we need only clear buffers with a transfer size
1976 * equal to the block size because buffers with a shorter
1977 * transfer size were cleared above by the call to ext2_balloc()
1978 * with the BA_CLRBUF flag set.
1980 * If the source region for uiomove identically mmaps the
1981 * buffer, uiomove() performed the NOP copy, and the buffer
1982 * content remains valid because the page fault handler
1983 * validated the pages.
1985 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
1986 fs->e2fs_bsize == xfersize)
1989 vfs_bio_set_flags(bp, ioflag);
1992 * If IO_SYNC each buffer is written synchronously. Otherwise
1993 * if we have a severe page deficiency write the buffer
1994 * asynchronously. Otherwise try to cluster, and if that
1995 * doesn't do it then either do an async write (if O_DIRECT),
1996 * or a delayed write (if not).
1998 if (ioflag & IO_SYNC) {
2000 } else if (vm_page_count_severe() ||
2001 buf_dirty_count_severe() ||
2002 (ioflag & IO_ASYNC)) {
2003 bp->b_flags |= B_CLUSTEROK;
2005 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
2006 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
2007 bp->b_flags |= B_CLUSTEROK;
2008 cluster_write(vp, bp, ip->i_size, seqcount, 0);
2012 } else if (ioflag & IO_DIRECT) {
2013 bp->b_flags |= B_CLUSTEROK;
2016 bp->b_flags |= B_CLUSTEROK;
2019 if (error || xfersize == 0)
2023 * If we successfully wrote any data, and we are not the superuser
2024 * we clear the setuid and setgid bits as a precaution against
2027 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
2029 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
2030 ip->i_mode &= ~(ISUID | ISGID);
2033 if (ioflag & IO_UNIT) {
2034 (void)ext2_truncate(vp, osize,
2035 ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
2036 uio->uio_offset -= resid - uio->uio_resid;
2037 uio->uio_resid = resid;
2040 if (uio->uio_resid != resid) {
2041 ip->i_flag |= IN_CHANGE | IN_UPDATE;
2042 if (ioflag & IO_SYNC)
2043 error = ext2_update(vp, 1);