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33 * @(#)ffs_vfsops.c 8.31 (Berkeley) 5/20/95
34 * $FreeBSD: src/sys/ufs/ffs/ffs_vfsops.c,v 1.117.2.10 2002/06/23 22:34:52 iedowse Exp $
35 * $DragonFly: src/sys/vfs/ufs/ffs_vfsops.c,v 1.5 2003/07/03 18:35:27 dillon Exp $
38 #include "opt_quota.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
43 #include <sys/namei.h>
44 #include <sys/kernel.h>
45 #include <sys/vnode.h>
46 #include <sys/mount.h>
49 #include <sys/fcntl.h>
50 #include <sys/disklabel.h>
51 #include <sys/malloc.h>
53 #include <ufs/ufs/quota.h>
54 #include <ufs/ufs/ufsmount.h>
55 #include <ufs/ufs/inode.h>
56 #include <ufs/ufs/ufs_extern.h>
58 #include <ufs/ffs/fs.h>
59 #include <ufs/ffs/ffs_extern.h>
62 #include <vm/vm_page.h>
63 #include <vm/vm_zone.h>
65 static MALLOC_DEFINE(M_FFSNODE, "FFS node", "FFS vnode private part");
67 static int ffs_sbupdate __P((struct ufsmount *, int));
68 static int ffs_reload __P((struct mount *,struct ucred *,struct thread *));
69 static int ffs_oldfscompat __P((struct fs *));
70 static int ffs_mount __P((struct mount *, char *, caddr_t,
71 struct nameidata *, struct thread *));
72 static int ffs_init __P((struct vfsconf *));
74 static struct vfsops ufs_vfsops = {
91 VFS_SET(ufs_vfsops, ufs, 0);
96 * Called when mounting local physical media
100 * mp mount point structure
101 * path NULL (flag for root mount!!!)
104 * p process (user credentials check [statfs])
107 * mp mount point structure
108 * path path to mount point
109 * data pointer to argument struct in user space
110 * ndp mount point namei() return (used for
111 * credentials on reload), reused to look
113 * p process (user credentials check)
116 * !0 error number (errno.h)
121 * mount point is locked
123 * mount point is locked
126 * A NULL path can be used for a flag since the mount
127 * system call will fail with EFAULT in copyinstr in
128 * namei() if it is a genuine NULL from the user.
131 ffs_mount( mp, path, data, ndp, td)
132 struct mount *mp; /* mount struct pointer*/
133 char *path; /* path to mount point*/
134 caddr_t data; /* arguments to FS specific mount*/
135 struct nameidata *ndp; /* mount point credentials*/
136 struct thread *td; /* process requesting mount*/
142 struct ufs_args args;
143 struct ufsmount *ump = 0;
144 register struct fs *fs;
145 int error, flags, ronly = 0;
149 KKASSERT(td->td_proc);
150 cred = td->td_proc->p_ucred;
153 * Use NULL path to flag a root mount
158 * Mounting root file system
162 if ((err = bdevvp(rootdev, &rootvp))) {
163 printf("ffs_mountroot: can't find rootvp\n");
167 if( ( err = ffs_mountfs(rootvp, mp, td, M_FFSNODE)) != 0) {
168 /* fs specific cleanup (if any)*/
172 goto dostatfs; /* success*/
178 * Mounting non-root file system or updating a file system
182 /* copy in user arguments*/
183 err = copyin(data, (caddr_t)&args, sizeof (struct ufs_args));
185 goto error_1; /* can't get arguments*/
188 * If updating, check whether changing from read-only to
189 * read/write; if there is no device name, that's all we do.
191 if (mp->mnt_flag & MNT_UPDATE) {
194 devvp = ump->um_devvp;
196 ronly = fs->fs_ronly; /* MNT_RELOAD might change this */
197 if (ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
199 * Flush any dirty data.
201 VFS_SYNC(mp, MNT_WAIT, td);
203 * Check for and optionally get rid of files open
207 if (mp->mnt_flag & MNT_FORCE)
209 if (mp->mnt_flag & MNT_SOFTDEP) {
210 err = softdep_flushfiles(mp, flags, td);
212 err = ffs_flushfiles(mp, flags, td);
216 if (!err && (mp->mnt_flag & MNT_RELOAD))
217 err = ffs_reload(mp, ndp->ni_cnd.cn_cred, td);
221 if (ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
223 * If upgrade to read-write by non-root, then verify
224 * that user has necessary permissions on the device.
226 if (cred->cr_uid != 0) {
227 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
228 if ((error = VOP_ACCESS(devvp, VREAD | VWRITE,
230 VOP_UNLOCK(devvp, 0, td);
233 VOP_UNLOCK(devvp, 0, td);
236 fs->fs_flags &= ~FS_UNCLEAN;
237 if (fs->fs_clean == 0) {
238 fs->fs_flags |= FS_UNCLEAN;
239 if (mp->mnt_flag & MNT_FORCE) {
241 "WARNING: %s was not properly dismounted\n",
245 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
252 /* check to see if we need to start softdep */
253 if (fs->fs_flags & FS_DOSOFTDEP) {
254 err = softdep_mount(devvp, mp, fs);
262 * Soft updates is incompatible with "async",
263 * so if we are doing softupdates stop the user
264 * from setting the async flag in an update.
265 * Softdep_mount() clears it in an initial mount
268 if (mp->mnt_flag & MNT_SOFTDEP) {
269 mp->mnt_flag &= ~MNT_ASYNC;
271 /* if not updating name...*/
272 if (args.fspec == 0) {
274 * Process export requests. Jumping to "success"
275 * will return the vfs_export() error code.
277 err = vfs_export(mp, &ump->um_export, &args.export);
283 * Not an update, or updating the name: look up the name
284 * and verify that it refers to a sensible block device.
286 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td);
289 /* can't get devvp!*/
293 NDFREE(ndp, NDF_ONLY_PNBUF);
296 if (!vn_isdisk(devvp, &err))
300 * If mount by non-root, then verify that user has necessary
301 * permissions on the device.
303 if (cred->cr_uid != 0) {
305 if ((mp->mnt_flag & MNT_RDONLY) == 0)
306 accessmode |= VWRITE;
307 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
308 if ((error = VOP_ACCESS(devvp, accessmode, cred, td)) != 0) {
312 VOP_UNLOCK(devvp, 0, td);
315 if (mp->mnt_flag & MNT_UPDATE) {
319 * If it's not the same vnode, or at least the same device
320 * then it's not correct.
324 if (devvp != ump->um_devvp) {
325 if ( devvp->v_rdev == ump->um_devvp->v_rdev) {
328 err = EINVAL; /* needs translation */
333 * Update device name only on success
336 /* Save "mounted from" info for mount point (NULL pad)*/
337 copyinstr( args.fspec,
338 mp->mnt_stat.f_mntfromname,
341 bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
351 * Since this is a new mount, we want the names for
352 * the device and the mount point copied in. If an
353 * error occurs, the mountpoint is discarded by the
356 /* Save "last mounted on" info for mount point (NULL pad)*/
357 copyinstr( path, /* mount point*/
358 mp->mnt_stat.f_mntonname, /* save area*/
359 MNAMELEN - 1, /* max size*/
360 &size); /* real size*/
361 bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
363 /* Save "mounted from" info for mount point (NULL pad)*/
364 copyinstr( args.fspec, /* device name*/
365 mp->mnt_stat.f_mntfromname, /* save area*/
366 MNAMELEN - 1, /* max size*/
367 &size); /* real size*/
368 bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
370 err = ffs_mountfs(devvp, mp, td, M_FFSNODE);
378 * Initialize FS stat information in mount struct; uses both
379 * mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
381 * This code is common to root and non-root mounts
383 (void)VFS_STATFS(mp, &mp->mnt_stat, td);
388 error_2: /* error with devvp held*/
390 /* release devvp before failing*/
393 error_1: /* no state to back out*/
396 if (!err && path && (mp->mnt_flag & MNT_UPDATE)) {
397 /* Update clean flag after changing read-onlyness. */
399 if (ronly != fs->fs_ronly) {
400 fs->fs_ronly = ronly;
401 fs->fs_clean = ronly &&
402 (fs->fs_flags & FS_UNCLEAN) == 0 ? 1 : 0;
403 ffs_sbupdate(ump, MNT_WAIT);
410 * Reload all incore data for a filesystem (used after running fsck on
411 * the root filesystem and finding things to fix). The filesystem must
412 * be mounted read-only.
414 * Things to do to update the mount:
415 * 1) invalidate all cached meta-data.
416 * 2) re-read superblock from disk.
417 * 3) re-read summary information from disk.
418 * 4) invalidate all inactive vnodes.
419 * 5) invalidate all cached file data.
420 * 6) re-read inode data for all active vnodes.
423 ffs_reload(struct mount *mp, struct ucred *cred, struct thread *td)
425 struct vnode *vp, *nvp, *devvp;
429 struct fs *fs, *newfs;
430 struct partinfo dpart;
432 int i, blks, size, error;
435 KKASSERT(td->td_proc && td->td_proc->p_ucred == cred);
437 if ((mp->mnt_flag & MNT_RDONLY) == 0)
440 * Step 1: invalidate all cached meta-data.
442 devvp = VFSTOUFS(mp)->um_devvp;
443 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
444 error = vinvalbuf(devvp, 0, td, 0, 0);
445 VOP_UNLOCK(devvp, 0, td);
447 panic("ffs_reload: dirty1");
452 * Only VMIO the backing device if the backing device is a real
453 * block device. See ffs_mountmfs() for more details.
455 if (devvp->v_tag != VT_MFS && vn_isdisk(devvp, NULL)) {
456 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
457 vfs_object_create(devvp, td);
458 simple_lock(&devvp->v_interlock);
459 VOP_UNLOCK(devvp, LK_INTERLOCK, td);
463 * Step 2: re-read superblock from disk.
465 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, td) != 0)
468 size = dpart.disklab->d_secsize;
469 if ((error = bread(devvp, (ufs_daddr_t)(SBOFF/size), SBSIZE, &bp)) != 0)
471 newfs = (struct fs *)bp->b_data;
472 if (newfs->fs_magic != FS_MAGIC || newfs->fs_bsize > MAXBSIZE ||
473 newfs->fs_bsize < sizeof(struct fs)) {
475 return (EIO); /* XXX needs translation */
477 fs = VFSTOUFS(mp)->um_fs;
479 * Copy pointer fields back into superblock before copying in XXX
480 * new superblock. These should really be in the ufsmount. XXX
481 * Note that important parameters (eg fs_ncg) are unchanged.
483 newfs->fs_csp = fs->fs_csp;
484 newfs->fs_maxcluster = fs->fs_maxcluster;
485 newfs->fs_contigdirs = fs->fs_contigdirs;
486 bcopy(newfs, fs, (u_int)fs->fs_sbsize);
487 if (fs->fs_sbsize < SBSIZE)
488 bp->b_flags |= B_INVAL;
490 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen;
492 /* An old fsck may have zeroed these fields, so recheck them. */
493 if (fs->fs_avgfilesize <= 0) /* XXX */
494 fs->fs_avgfilesize = AVFILESIZ; /* XXX */
495 if (fs->fs_avgfpdir <= 0) /* XXX */
496 fs->fs_avgfpdir = AFPDIR; /* XXX */
499 * Step 3: re-read summary information from disk.
501 blks = howmany(fs->fs_cssize, fs->fs_fsize);
503 for (i = 0; i < blks; i += fs->fs_frag) {
505 if (i + fs->fs_frag > blks)
506 size = (blks - i) * fs->fs_fsize;
507 error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, &bp);
510 bcopy(bp->b_data, space, (u_int)size);
511 space = (char *)space + size;
515 * We no longer know anything about clusters per cylinder group.
517 if (fs->fs_contigsumsize > 0) {
518 lp = fs->fs_maxcluster;
519 for (i = 0; i < fs->fs_ncg; i++)
520 *lp++ = fs->fs_contigsumsize;
524 simple_lock(&mntvnode_slock);
525 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) {
526 if (vp->v_mount != mp) {
527 simple_unlock(&mntvnode_slock);
530 nvp = TAILQ_NEXT(vp, v_nmntvnodes);
532 * Step 4: invalidate all inactive vnodes.
534 if (vrecycle(vp, &mntvnode_slock, td))
537 * Step 5: invalidate all cached file data.
539 simple_lock(&vp->v_interlock);
540 simple_unlock(&mntvnode_slock);
541 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
544 if (vinvalbuf(vp, 0, td, 0, 0))
545 panic("ffs_reload: dirty2");
547 * Step 6: re-read inode data for all active vnodes.
551 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
552 (int)fs->fs_bsize, &bp);
557 ip->i_din = *((struct dinode *)bp->b_data +
558 ino_to_fsbo(fs, ip->i_number));
559 ip->i_effnlink = ip->i_nlink;
562 simple_lock(&mntvnode_slock);
564 simple_unlock(&mntvnode_slock);
569 * Common code for mount and mountroot
572 ffs_mountfs(devvp, mp, td, malloctype)
573 register struct vnode *devvp;
576 struct malloc_type *malloctype;
578 register struct ufsmount *ump;
580 register struct fs *fs;
582 struct partinfo dpart;
584 int error, i, blks, size, ronly;
586 u_int64_t maxfilesize; /* XXX */
592 * Disallow multiple mounts of the same device.
593 * Disallow mounting of a device that is currently in use
594 * (except for root, which might share swap device for miniroot).
595 * Flush out any old buffers remaining from a previous use.
597 error = vfs_mountedon(devvp);
600 ncount = vcount(devvp);
602 if (ncount > 1 && devvp != rootvp)
604 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
605 error = vinvalbuf(devvp, V_SAVE, td, 0, 0);
606 VOP_UNLOCK(devvp, 0, td);
611 * Only VMIO the backing device if the backing device is a real
612 * block device. This excludes the original MFS implementation.
613 * Note that it is optional that the backing device be VMIOed. This
614 * increases the opportunity for metadata caching.
616 if (devvp->v_tag != VT_MFS && vn_isdisk(devvp, NULL)) {
617 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
618 vfs_object_create(devvp, td);
619 simple_lock(&devvp->v_interlock);
620 VOP_UNLOCK(devvp, LK_INTERLOCK, td);
623 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
624 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
625 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td);
626 VOP_UNLOCK(devvp, 0, td);
629 if (devvp->v_rdev->si_iosize_max != 0)
630 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
631 if (mp->mnt_iosize_max > MAXPHYS)
632 mp->mnt_iosize_max = MAXPHYS;
634 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, proc0.p_ucred, td) != 0)
637 size = dpart.disklab->d_secsize;
641 if ((error = bread(devvp, SBLOCK, SBSIZE, &bp)) != 0)
643 fs = (struct fs *)bp->b_data;
644 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
645 fs->fs_bsize < sizeof(struct fs)) {
646 error = EINVAL; /* XXX needs translation */
650 fs->fs_flags &= ~FS_UNCLEAN;
651 if (fs->fs_clean == 0) {
652 fs->fs_flags |= FS_UNCLEAN;
653 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
655 "WARNING: %s was not properly dismounted\n",
659 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
665 /* XXX updating 4.2 FFS superblocks trashes rotational layout tables */
666 if (fs->fs_postblformat == FS_42POSTBLFMT && !ronly) {
667 error = EROFS; /* needs translation */
670 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
671 bzero((caddr_t)ump, sizeof *ump);
672 ump->um_malloctype = malloctype;
673 ump->um_i_effnlink_valid = 1;
674 ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT,
676 ump->um_blkatoff = ffs_blkatoff;
677 ump->um_truncate = ffs_truncate;
678 ump->um_update = ffs_update;
679 ump->um_valloc = ffs_valloc;
680 ump->um_vfree = ffs_vfree;
681 bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize);
682 if (fs->fs_sbsize < SBSIZE)
683 bp->b_flags |= B_INVAL;
687 fs->fs_ronly = ronly;
688 size = fs->fs_cssize;
689 blks = howmany(size, fs->fs_fsize);
690 if (fs->fs_contigsumsize > 0)
691 size += fs->fs_ncg * sizeof(int32_t);
692 size += fs->fs_ncg * sizeof(u_int8_t);
693 space = malloc((u_long)size, M_UFSMNT, M_WAITOK);
695 for (i = 0; i < blks; i += fs->fs_frag) {
697 if (i + fs->fs_frag > blks)
698 size = (blks - i) * fs->fs_fsize;
699 if ((error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size,
701 free(fs->fs_csp, M_UFSMNT);
704 bcopy(bp->b_data, space, (u_int)size);
705 space = (char *)space + size;
709 if (fs->fs_contigsumsize > 0) {
710 fs->fs_maxcluster = lp = space;
711 for (i = 0; i < fs->fs_ncg; i++)
712 *lp++ = fs->fs_contigsumsize;
715 size = fs->fs_ncg * sizeof(u_int8_t);
716 fs->fs_contigdirs = (u_int8_t *)space;
717 bzero(fs->fs_contigdirs, size);
718 /* Compatibility for old filesystems XXX */
719 if (fs->fs_avgfilesize <= 0) /* XXX */
720 fs->fs_avgfilesize = AVFILESIZ; /* XXX */
721 if (fs->fs_avgfpdir <= 0) /* XXX */
722 fs->fs_avgfpdir = AFPDIR; /* XXX */
723 mp->mnt_data = (qaddr_t)ump;
724 mp->mnt_stat.f_fsid.val[0] = fs->fs_id[0];
725 mp->mnt_stat.f_fsid.val[1] = fs->fs_id[1];
726 if (fs->fs_id[0] == 0 || fs->fs_id[1] == 0 ||
727 vfs_getvfs(&mp->mnt_stat.f_fsid))
729 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen;
730 mp->mnt_flag |= MNT_LOCAL;
733 ump->um_devvp = devvp;
734 ump->um_nindir = fs->fs_nindir;
735 ump->um_bptrtodb = fs->fs_fsbtodb;
736 ump->um_seqinc = fs->fs_frag;
737 for (i = 0; i < MAXQUOTAS; i++)
738 ump->um_quotas[i] = NULLVP;
739 devvp->v_specmountpoint = mp;
743 * Set FS local "last mounted on" information (NULL pad)
745 copystr( mp->mnt_stat.f_mntonname, /* mount point*/
746 fs->fs_fsmnt, /* copy area*/
747 sizeof(fs->fs_fsmnt) - 1, /* max size*/
748 &strsize); /* real size*/
749 bzero( fs->fs_fsmnt + strsize, sizeof(fs->fs_fsmnt) - strsize);
751 if( mp->mnt_flag & MNT_ROOTFS) {
753 * Root mount; update timestamp in mount structure.
754 * this will be used by the common root mount code
755 * to update the system clock.
757 mp->mnt_time = fs->fs_time;
760 ump->um_savedmaxfilesize = fs->fs_maxfilesize; /* XXX */
761 maxfilesize = (u_int64_t)0x40000000 * fs->fs_bsize - 1; /* XXX */
762 /* Enforce limit caused by vm object backing (32 bits vm_pindex_t). */
763 if (maxfilesize > (u_int64_t)0x80000000u * PAGE_SIZE - 1)
764 maxfilesize = (u_int64_t)0x80000000u * PAGE_SIZE - 1;
765 if (fs->fs_maxfilesize > maxfilesize) /* XXX */
766 fs->fs_maxfilesize = maxfilesize; /* XXX */
768 if ((fs->fs_flags & FS_DOSOFTDEP) &&
769 (error = softdep_mount(devvp, mp, fs)) != 0) {
770 free(fs->fs_csp, M_UFSMNT);
775 (void) ffs_sbupdate(ump, MNT_WAIT);
779 devvp->v_specmountpoint = NULL;
782 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, td);
784 free(ump->um_fs, M_UFSMNT);
786 mp->mnt_data = (qaddr_t)0;
792 * Sanity checks for old file systems.
794 * XXX - goes away some day.
801 fs->fs_npsect = max(fs->fs_npsect, fs->fs_nsect); /* XXX */
802 fs->fs_interleave = max(fs->fs_interleave, 1); /* XXX */
803 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
804 fs->fs_nrpos = 8; /* XXX */
805 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
808 u_int64_t sizepb = fs->fs_bsize; /* XXX */
810 fs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */
811 for (i = 0; i < NIADDR; i++) { /* XXX */
812 sizepb *= NINDIR(fs); /* XXX */
813 fs->fs_maxfilesize += sizepb; /* XXX */
816 fs->fs_maxfilesize = (u_quad_t) 1LL << 39;
817 fs->fs_qbmask = ~fs->fs_bmask; /* XXX */
818 fs->fs_qfmask = ~fs->fs_fmask; /* XXX */
824 * unmount system call
827 ffs_unmount(struct mount *mp, int mntflags, struct thread *td)
829 register struct ufsmount *ump;
830 register struct fs *fs;
834 if (mntflags & MNT_FORCE) {
837 if (mp->mnt_flag & MNT_SOFTDEP) {
838 if ((error = softdep_flushfiles(mp, flags, td)) != 0)
841 if ((error = ffs_flushfiles(mp, flags, td)) != 0)
846 if (fs->fs_ronly == 0) {
847 fs->fs_clean = fs->fs_flags & FS_UNCLEAN ? 0 : 1;
848 error = ffs_sbupdate(ump, MNT_WAIT);
854 ump->um_devvp->v_specmountpoint = NULL;
856 vinvalbuf(ump->um_devvp, V_SAVE, td, 0, 0);
857 error = VOP_CLOSE(ump->um_devvp, fs->fs_ronly ? FREAD : FREAD|FWRITE, td);
859 vrele(ump->um_devvp);
861 free(fs->fs_csp, M_UFSMNT);
864 mp->mnt_data = (qaddr_t)0;
865 mp->mnt_flag &= ~MNT_LOCAL;
870 * Flush out all the files in a filesystem.
873 ffs_flushfiles(struct mount *mp, int flags, struct thread *td)
875 struct ufsmount *ump;
879 KKASSERT(td->td_proc);
880 cred = td->td_proc->p_ucred;
884 if (mp->mnt_flag & MNT_QUOTA) {
886 error = vflush(mp, 0, SKIPSYSTEM|flags);
889 for (i = 0; i < MAXQUOTAS; i++) {
890 if (ump->um_quotas[i] == NULLVP)
895 * Here we fall through to vflush again to ensure
896 * that we have gotten rid of all the system vnodes.
901 * Flush all the files.
903 if ((error = vflush(mp, 0, flags)) != 0)
906 * Flush filesystem metadata.
908 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td);
909 error = VOP_FSYNC(ump->um_devvp, MNT_WAIT, td);
910 VOP_UNLOCK(ump->um_devvp, 0, td);
915 * Get file system statistics.
918 ffs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
920 register struct ufsmount *ump;
921 register struct fs *fs;
925 if (fs->fs_magic != FS_MAGIC)
927 sbp->f_bsize = fs->fs_fsize;
928 sbp->f_iosize = fs->fs_bsize;
929 sbp->f_blocks = fs->fs_dsize;
930 sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag +
931 fs->fs_cstotal.cs_nffree;
932 sbp->f_bavail = freespace(fs, fs->fs_minfree);
933 sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO;
934 sbp->f_ffree = fs->fs_cstotal.cs_nifree;
935 if (sbp != &mp->mnt_stat) {
936 sbp->f_type = mp->mnt_vfc->vfc_typenum;
937 bcopy((caddr_t)mp->mnt_stat.f_mntonname,
938 (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
939 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
940 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
946 * Go through the disk queues to initiate sandbagged IO;
947 * go through the inodes to write those that have been modified;
948 * initiate the writing of the super block if it has been modified.
950 * Note: we are always called with the filesystem marked `MPBUSY'.
953 ffs_sync(struct mount *mp, int waitfor, struct thread *td)
955 struct vnode *nvp, *vp;
957 struct ufsmount *ump = VFSTOUFS(mp);
959 int error, allerror = 0;
962 if (fs->fs_fmod != 0 && fs->fs_ronly != 0) { /* XXX */
963 printf("fs = %s\n", fs->fs_fsmnt);
964 panic("ffs_sync: rofs mod");
967 * Write back each (modified) inode.
969 simple_lock(&mntvnode_slock);
971 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) {
973 * If the vnode that we are about to sync is no longer
974 * associated with this mount point, start over.
976 if (vp->v_mount != mp)
980 * Depend on the mntvnode_slock to keep things stable enough
981 * for a quick test. Since there might be hundreds of
982 * thousands of vnodes, we cannot afford even a subroutine
983 * call unless there's a good chance that we have work to do.
985 nvp = TAILQ_NEXT(vp, v_nmntvnodes);
987 if (vp->v_type == VNON || ((ip->i_flag &
988 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
989 TAILQ_EMPTY(&vp->v_dirtyblkhd))) {
992 if (vp->v_type != VCHR) {
993 simple_unlock(&mntvnode_slock);
994 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT, td);
996 simple_lock(&mntvnode_slock);
1000 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
1002 VOP_UNLOCK(vp, 0, td);
1004 simple_lock(&mntvnode_slock);
1008 * We must reference the vp to prevent it from
1009 * getting ripped out from under UFS_UPDATE, since
1010 * we are not holding a vnode lock. XXX why aren't
1011 * we holding a vnode lock?
1014 simple_unlock(&mntvnode_slock);
1015 /* UFS_UPDATE(vp, waitfor == MNT_WAIT); */
1018 simple_lock(&mntvnode_slock);
1020 if (TAILQ_NEXT(vp, v_nmntvnodes) != nvp)
1023 simple_unlock(&mntvnode_slock);
1025 * Force stale file system control information to be flushed.
1027 if (waitfor != MNT_LAZY) {
1028 if (ump->um_mountp->mnt_flag & MNT_SOFTDEP)
1029 waitfor = MNT_NOWAIT;
1030 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td);
1031 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
1033 VOP_UNLOCK(ump->um_devvp, 0, td);
1039 * Write back modified superblock.
1041 if (fs->fs_fmod != 0 && (error = ffs_sbupdate(ump, waitfor)) != 0)
1047 * Look up a FFS dinode number to find its incore vnode, otherwise read it
1048 * in from disk. If it is in core, wait for the lock bit to clear, then
1049 * return the inode locked. Detection and handling of mount points must be
1050 * done by the calling routine.
1052 static int ffs_inode_hash_lock;
1055 ffs_vget(mp, ino, vpp)
1062 struct ufsmount *ump;
1071 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) {
1076 * Lock out the creation of new entries in the FFS hash table in
1077 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
1080 if (ffs_inode_hash_lock) {
1081 while (ffs_inode_hash_lock) {
1082 ffs_inode_hash_lock = -1;
1083 tsleep(&ffs_inode_hash_lock, PVM, "ffsvgt", 0);
1087 ffs_inode_hash_lock = 1;
1090 * If this MALLOC() is performed after the getnewvnode()
1091 * it might block, leaving a vnode with a NULL v_data to be
1092 * found by ffs_sync() if a sync happens to fire right then,
1093 * which will cause a panic because ffs_sync() blindly
1094 * dereferences vp->v_data (as well it should).
1096 MALLOC(ip, struct inode *, sizeof(struct inode),
1097 ump->um_malloctype, M_WAITOK);
1099 /* Allocate a new vnode/inode. */
1100 error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp);
1102 if (ffs_inode_hash_lock < 0)
1103 wakeup(&ffs_inode_hash_lock);
1104 ffs_inode_hash_lock = 0;
1106 FREE(ip, ump->um_malloctype);
1109 bzero((caddr_t)ip, sizeof(struct inode));
1110 lockinit(&ip->i_lock, PINOD, "inode", VLKTIMEOUT, LK_CANRECURSE);
1113 * FFS supports lock sharing in the stack of vnodes
1115 vp->v_vnlock = &ip->i_lock;
1117 ip->i_fs = fs = ump->um_fs;
1123 for (i = 0; i < MAXQUOTAS; i++)
1124 ip->i_dquot[i] = NODQUOT;
1128 * Put it onto its hash chain and lock it so that other requests for
1129 * this inode will block if they arrive while we are sleeping waiting
1130 * for old data structures to be purged or for the contents of the
1131 * disk portion of this inode to be read.
1135 if (ffs_inode_hash_lock < 0)
1136 wakeup(&ffs_inode_hash_lock);
1137 ffs_inode_hash_lock = 0;
1139 /* Read in the disk contents for the inode, copy into the inode. */
1140 error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
1141 (int)fs->fs_bsize, &bp);
1144 * The inode does not contain anything useful, so it would
1145 * be misleading to leave it on its hash chain. With mode
1146 * still zero, it will be unlinked and returned to the free
1154 ip->i_din = *((struct dinode *)bp->b_data + ino_to_fsbo(fs, ino));
1155 if (DOINGSOFTDEP(vp))
1156 softdep_load_inodeblock(ip);
1158 ip->i_effnlink = ip->i_nlink;
1162 * Initialize the vnode from the inode, check for aliases.
1163 * Note that the underlying vnode may have changed.
1165 error = ufs_vinit(mp, ffs_specop_p, ffs_fifoop_p, &vp);
1172 * Finish inode initialization now that aliasing has been resolved.
1174 ip->i_devvp = ump->um_devvp;
1177 * Set up a generation number for this inode if it does not
1178 * already have one. This should only happen on old filesystems.
1180 if (ip->i_gen == 0) {
1181 ip->i_gen = random() / 2 + 1;
1182 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1183 ip->i_flag |= IN_MODIFIED;
1186 * Ensure that uid and gid are correct. This is a temporary
1187 * fix until fsck has been changed to do the update.
1189 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
1190 ip->i_uid = ip->i_din.di_ouid; /* XXX */
1191 ip->i_gid = ip->i_din.di_ogid; /* XXX */
1199 * File handle to vnode
1201 * Have to be really careful about stale file handles:
1202 * - check that the inode number is valid
1203 * - call ffs_vget() to get the locked inode
1204 * - check for an unallocated inode (i_mode == 0)
1205 * - check that the given client host has export rights and return
1206 * those rights via. exflagsp and credanonp
1209 ffs_fhtovp(mp, fhp, vpp)
1210 register struct mount *mp;
1214 register struct ufid *ufhp;
1217 ufhp = (struct ufid *)fhp;
1218 fs = VFSTOUFS(mp)->um_fs;
1219 if (ufhp->ufid_ino < ROOTINO ||
1220 ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg)
1222 return (ufs_fhtovp(mp, ufhp, vpp));
1226 * Vnode pointer to File handle
1234 register struct inode *ip;
1235 register struct ufid *ufhp;
1238 ufhp = (struct ufid *)fhp;
1239 ufhp->ufid_len = sizeof(struct ufid);
1240 ufhp->ufid_ino = ip->i_number;
1241 ufhp->ufid_gen = ip->i_gen;
1246 * Initialize the filesystem; just use ufs_init.
1250 struct vfsconf *vfsp;
1253 softdep_initialize();
1254 return (ufs_init(vfsp));
1258 * Write a superblock and associated information back to disk.
1261 ffs_sbupdate(mp, waitfor)
1262 struct ufsmount *mp;
1265 register struct fs *dfs, *fs = mp->um_fs;
1266 register struct buf *bp;
1269 int i, size, error, allerror = 0;
1272 * First write back the summary information.
1274 blks = howmany(fs->fs_cssize, fs->fs_fsize);
1276 for (i = 0; i < blks; i += fs->fs_frag) {
1277 size = fs->fs_bsize;
1278 if (i + fs->fs_frag > blks)
1279 size = (blks - i) * fs->fs_fsize;
1280 bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i),
1282 bcopy(space, bp->b_data, (u_int)size);
1283 space = (char *)space + size;
1284 if (waitfor != MNT_WAIT)
1286 else if ((error = bwrite(bp)) != 0)
1290 * Now write back the superblock itself. If any errors occurred
1291 * up to this point, then fail so that the superblock avoids
1292 * being written out as clean.
1296 bp = getblk(mp->um_devvp, SBLOCK, (int)fs->fs_sbsize, 0, 0);
1298 fs->fs_time = time_second;
1299 bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize);
1300 /* Restore compatibility to old file systems. XXX */
1301 dfs = (struct fs *)bp->b_data; /* XXX */
1302 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
1303 dfs->fs_nrpos = -1; /* XXX */
1304 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
1305 int32_t *lp, tmp; /* XXX */
1307 lp = (int32_t *)&dfs->fs_qbmask; /* XXX */
1308 tmp = lp[4]; /* XXX */
1309 for (i = 4; i > 0; i--) /* XXX */
1310 lp[i] = lp[i-1]; /* XXX */
1311 lp[0] = tmp; /* XXX */
1313 dfs->fs_maxfilesize = mp->um_savedmaxfilesize; /* XXX */
1314 if (waitfor != MNT_WAIT)
1316 else if ((error = bwrite(bp)) != 0)