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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 1.37 2006/03/29 18:45:04 dillon Exp $
38 #include "opt_quota.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
43 #include <sys/nlookup.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>
56 #include "ufs_extern.h"
59 #include "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 (struct ufsmount *, int);
68 static int ffs_reload (struct mount *,struct ucred *,struct thread *);
69 static int ffs_oldfscompat (struct fs *);
70 static int ffs_mount (struct mount *, char *, caddr_t, struct thread *);
71 static int ffs_init (struct vfsconf *);
73 static struct vfsops ufs_vfsops = {
74 .vfs_mount = ffs_mount,
75 .vfs_unmount = ffs_unmount,
77 .vfs_quotactl = ufs_quotactl,
78 .vfs_statfs = ffs_statfs,
81 .vfs_fhtovp = ffs_fhtovp,
82 .vfs_checkexp = ufs_check_export,
83 .vfs_vptofh = ffs_vptofh,
85 .vfs_uninit = ufs_uninit
88 VFS_SET(ufs_vfsops, ufs, 0);
90 extern struct vnodeopv_entry_desc ffs_vnodeop_entries[];
91 extern struct vnodeopv_entry_desc ffs_specop_entries[];
92 extern struct vnodeopv_entry_desc ffs_fifoop_entries[];
98 * Called when mounting local physical media
102 * mp mount point structure
103 * path NULL (flag for root mount!!!)
105 * p process (user credentials check [statfs])
108 * mp mount point structure
109 * path path to mount point
110 * data pointer to argument struct in user space
111 * p process (user credentials check)
114 * !0 error number (errno.h)
119 * mount point is locked
121 * mount point is locked
124 * A NULL path can be used for a flag since the mount
125 * system call will fail with EFAULT in copyinstr in
126 * nlookup() if it is a genuine NULL from the user.
129 ffs_mount(struct mount *mp, /* mount struct pointer */
130 char *path, /* path to mount point */
131 caddr_t data, /* arguments to FS specific mount */
132 struct thread *td) /* process requesting mount */
138 struct ufs_args args;
139 struct ufsmount *ump = 0;
141 int flags, ronly = 0;
144 struct nlookupdata nd;
145 struct vnode *rootvp;
147 KKASSERT(td->td_proc);
148 cred = td->td_proc->p_ucred;
152 * Use NULL path to flag a root mount
157 * Mounting root filesystem
161 if ((error = bdevvp(rootdev, &rootvp))) {
162 printf("ffs_mountroot: can't find rootvp\n");
166 if( ( error = ffs_mountfs(rootvp, mp, td, M_FFSNODE)) != 0) {
167 /* fs specific cleanup (if any)*/
171 goto dostatfs; /* success*/
177 * Mounting non-root filesystem or updating a filesystem
181 /* copy in user arguments*/
182 error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args));
184 goto error_1; /* can't get arguments*/
187 * If updating, check whether changing from read-only to
188 * read/write; if there is no device name, that's all we do.
190 if (mp->mnt_flag & MNT_UPDATE) {
193 devvp = ump->um_devvp;
195 ronly = fs->fs_ronly; /* MNT_RELOAD might change this */
196 if (ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
198 * Flush any dirty data.
200 VFS_SYNC(mp, MNT_WAIT, td);
202 * Check for and optionally get rid of files open
206 if (mp->mnt_flag & MNT_FORCE)
208 if (mp->mnt_flag & MNT_SOFTDEP) {
209 error = softdep_flushfiles(mp, flags, td);
211 error = ffs_flushfiles(mp, flags, td);
215 if (!error && (mp->mnt_flag & MNT_RELOAD))
216 error = ffs_reload(mp, NULL, td);
220 if (ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
222 * If upgrade to read-write by non-root, then verify
223 * that user has necessary permissions on the device.
225 if (cred->cr_uid != 0) {
226 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
227 if ((error = VOP_ACCESS(devvp, VREAD | VWRITE,
229 VOP_UNLOCK(devvp, 0, td);
232 VOP_UNLOCK(devvp, 0, td);
235 fs->fs_flags &= ~FS_UNCLEAN;
236 if (fs->fs_clean == 0) {
237 fs->fs_flags |= FS_UNCLEAN;
238 if (mp->mnt_flag & MNT_FORCE) {
240 "WARNING: %s was not properly dismounted\n",
244 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
251 /* check to see if we need to start softdep */
252 if (fs->fs_flags & FS_DOSOFTDEP) {
253 error = softdep_mount(devvp, mp, fs);
261 * Soft updates is incompatible with "async",
262 * so if we are doing softupdates stop the user
263 * from setting the async flag in an update.
264 * Softdep_mount() clears it in an initial mount
267 if (mp->mnt_flag & MNT_SOFTDEP) {
268 mp->mnt_flag &= ~MNT_ASYNC;
270 /* if not updating name...*/
271 if (args.fspec == 0) {
273 * Process export requests. Jumping to "success"
274 * will return the vfs_export() error code.
276 error = vfs_export(mp, &ump->um_export, &args.export);
282 * Not an update, or updating the name: look up the name
283 * and verify that it refers to a sensible block device.
286 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
288 error = nlookup(&nd);
290 error = cache_vref(nd.nl_ncp, nd.nl_cred, &devvp);
295 if (!vn_isdisk(devvp, &error))
299 * If mount by non-root, then verify that user has necessary
300 * permissions on the device.
302 if (cred->cr_uid != 0) {
304 if ((mp->mnt_flag & MNT_RDONLY) == 0)
305 accessmode |= VWRITE;
306 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
307 if ((error = VOP_ACCESS(devvp, accessmode, cred, td)) != 0) {
311 VOP_UNLOCK(devvp, 0, td);
314 if (mp->mnt_flag & MNT_UPDATE) {
318 * If it's not the same vnode, or at least the same device
319 * then it's not correct. NOTE: devvp->v_rdev may be NULL
320 * since we haven't opened it, so we compare udev instead.
323 if (devvp != ump->um_devvp) {
324 if (devvp->v_udev == ump->um_devvp->v_udev) {
327 printf("cannot update mount, udev does"
328 " not match %08x vs %08x\n",
329 devvp->v_udev, ump->um_devvp->v_udev);
330 error = EINVAL; /* needs translation */
336 * Update device name only on success
339 /* Save "mounted from" info for mount point (NULL pad)*/
340 copyinstr( args.fspec,
341 mp->mnt_stat.f_mntfromname,
344 bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
353 /* Save "mounted from" info for mount point (NULL pad)*/
354 copyinstr( args.fspec, /* device name*/
355 mp->mnt_stat.f_mntfromname, /* save area*/
356 MNAMELEN - 1, /* max size*/
357 &size); /* real size*/
358 bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
360 error = ffs_mountfs(devvp, mp, td, M_FFSNODE);
368 * Initialize FS stat information in mount struct; uses
369 * mp->mnt_stat.f_mntfromname.
371 * This code is common to root and non-root mounts
373 (void)VFS_STATFS(mp, &mp->mnt_stat, td);
378 error_2: /* error with devvp held*/
380 /* release devvp before failing*/
383 error_1: /* no state to back out*/
386 if (!error && path && (mp->mnt_flag & MNT_UPDATE)) {
387 /* Update clean flag after changing read-onlyness. */
389 if (ronly != fs->fs_ronly) {
390 fs->fs_ronly = ronly;
391 fs->fs_clean = ronly &&
392 (fs->fs_flags & FS_UNCLEAN) == 0 ? 1 : 0;
393 ffs_sbupdate(ump, MNT_WAIT);
400 * Reload all incore data for a filesystem (used after running fsck on
401 * the root filesystem and finding things to fix). The filesystem must
402 * be mounted read-only.
404 * Things to do to update the mount:
405 * 1) invalidate all cached meta-data.
406 * 2) re-read superblock from disk.
407 * 3) re-read summary information from disk.
408 * 4) invalidate all inactive vnodes.
409 * 5) invalidate all cached file data.
410 * 6) re-read inode data for all active vnodes.
413 static int ffs_reload_scan2(struct mount *mp, struct vnode *vp, void *data);
425 ffs_reload(struct mount *mp, struct ucred *cred, struct thread *td)
430 struct fs *fs, *newfs;
431 struct partinfo dpart;
433 int i, blks, size, error;
434 struct scaninfo scaninfo;
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 * The backing device must be VMIO-capable because we use getblk().
453 * NOTE: the MFS driver now returns a VMIO-enabled descriptor.
455 if (devvp->v_object == NULL)
456 panic("ffs_reload: devvp has no VM object!");
459 * Step 2: re-read superblock from disk.
461 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, td) != 0)
464 size = dpart.disklab->d_secsize;
465 if ((error = bread(devvp, SBOFF, SBSIZE, &bp)) != 0) {
469 newfs = (struct fs *)bp->b_data;
470 if (newfs->fs_magic != FS_MAGIC || newfs->fs_bsize > MAXBSIZE ||
471 newfs->fs_bsize < sizeof(struct fs)) {
473 return (EIO); /* XXX needs translation */
475 fs = VFSTOUFS(mp)->um_fs;
477 * Copy pointer fields back into superblock before copying in XXX
478 * new superblock. These should really be in the ufsmount. XXX
479 * Note that important parameters (eg fs_ncg) are unchanged.
481 newfs->fs_csp = fs->fs_csp;
482 newfs->fs_maxcluster = fs->fs_maxcluster;
483 newfs->fs_contigdirs = fs->fs_contigdirs;
484 /* The filesystem is still read-only. */
486 bcopy(newfs, fs, (uint)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, fsbtodoff(fs, fs->fs_csaddr + i), size, &bp);
512 bcopy(bp->b_data, space, (uint)size);
513 space = (char *)space + size;
517 * We no longer know anything about clusters per cylinder group.
519 if (fs->fs_contigsumsize > 0) {
520 lp = fs->fs_maxcluster;
521 for (i = 0; i < fs->fs_ncg; i++)
522 *lp++ = fs->fs_contigsumsize;
527 scaninfo.devvp = devvp;
529 while (error == 0 && scaninfo.rescan) {
531 error = vmntvnodescan(mp, VMSC_GETVX,
532 NULL, ffs_reload_scan2, &scaninfo);
538 ffs_reload_scan2(struct mount *mp, struct vnode *vp, void *data)
540 struct scaninfo *info = data;
548 if (vrecycle(vp, info->td))
551 if (vinvalbuf(vp, 0, info->td, 0, 0))
552 panic("ffs_reload: dirty2");
554 * Step 6: re-read inode data for all active vnodes.
557 error = bread(info->devvp,
558 fsbtodoff(info->fs, ino_to_fsba(info->fs, ip->i_number)),
559 (int)info->fs->fs_bsize, &bp);
564 ip->i_din = *((struct dinode *)bp->b_data +
565 ino_to_fsbo(info->fs, ip->i_number));
566 ip->i_effnlink = ip->i_nlink;
572 * Common code for mount and mountroot
575 ffs_mountfs(struct vnode *devvp, struct mount *mp, struct thread *td,
576 struct malloc_type *malloctype)
578 struct ufsmount *ump;
582 struct partinfo dpart;
584 int error, i, blks, size, ronly;
586 uint64_t maxfilesize; /* XXX */
589 * Disallow multiple mounts of the same device.
590 * Disallow mounting of a device that is currently in use
591 * Flush out any old buffers remaining from a previous use.
593 error = vfs_mountedon(devvp);
596 if (count_udev(devvp->v_udev) > 0)
598 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
599 error = vinvalbuf(devvp, V_SAVE, td, 0, 0);
600 VOP_UNLOCK(devvp, 0, td);
604 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
605 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
606 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, NULL, td);
607 VOP_UNLOCK(devvp, 0, td);
611 if (dev->si_iosize_max != 0)
612 mp->mnt_iosize_max = dev->si_iosize_max;
613 if (mp->mnt_iosize_max > MAXPHYS)
614 mp->mnt_iosize_max = MAXPHYS;
617 * The backing device must be VMIO-capable because we use getblk().
618 * NOTE: the MFS driver now returns a VMIO-enabled descriptor.
619 * The VOP_OPEN() call above should have associated a VM object
622 if (devvp->v_object == NULL)
623 panic("ffs_reload: devvp has no VM object!");
625 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, proc0.p_ucred, td) != 0)
628 size = dpart.disklab->d_secsize;
632 if ((error = bread(devvp, SBOFF, SBSIZE, &bp)) != 0)
634 fs = (struct fs *)bp->b_data;
635 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
636 fs->fs_bsize < sizeof(struct fs)) {
637 error = EINVAL; /* XXX needs translation */
641 fs->fs_flags &= ~FS_UNCLEAN;
642 if (fs->fs_clean == 0) {
643 fs->fs_flags |= FS_UNCLEAN;
644 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
646 "WARNING: %s was not properly dismounted\n",
650 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
656 /* XXX updating 4.2 FFS superblocks trashes rotational layout tables */
657 if (fs->fs_postblformat == FS_42POSTBLFMT && !ronly) {
658 error = EROFS; /* needs translation */
661 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
662 bzero((caddr_t)ump, sizeof *ump);
663 ump->um_malloctype = malloctype;
664 ump->um_i_effnlink_valid = 1;
665 ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT,
667 ump->um_blkatoff = ffs_blkatoff;
668 ump->um_truncate = ffs_truncate;
669 ump->um_update = ffs_update;
670 ump->um_valloc = ffs_valloc;
671 ump->um_vfree = ffs_vfree;
672 bcopy(bp->b_data, ump->um_fs, (uint)fs->fs_sbsize);
673 if (fs->fs_sbsize < SBSIZE)
674 bp->b_flags |= B_INVAL;
678 fs->fs_ronly = ronly;
679 size = fs->fs_cssize;
680 blks = howmany(size, fs->fs_fsize);
681 if (fs->fs_contigsumsize > 0)
682 size += fs->fs_ncg * sizeof(int32_t);
683 size += fs->fs_ncg * sizeof(uint8_t);
684 space = malloc((u_long)size, M_UFSMNT, M_WAITOK);
686 for (i = 0; i < blks; i += fs->fs_frag) {
688 if (i + fs->fs_frag > blks)
689 size = (blks - i) * fs->fs_fsize;
690 if ((error = bread(devvp, fsbtodoff(fs, fs->fs_csaddr + i),
692 free(fs->fs_csp, M_UFSMNT);
695 bcopy(bp->b_data, space, (uint)size);
696 space = (char *)space + size;
700 if (fs->fs_contigsumsize > 0) {
701 fs->fs_maxcluster = lp = space;
702 for (i = 0; i < fs->fs_ncg; i++)
703 *lp++ = fs->fs_contigsumsize;
706 size = fs->fs_ncg * sizeof(uint8_t);
707 fs->fs_contigdirs = (uint8_t *)space;
708 bzero(fs->fs_contigdirs, size);
709 /* Compatibility for old filesystems XXX */
710 if (fs->fs_avgfilesize <= 0) /* XXX */
711 fs->fs_avgfilesize = AVFILESIZ; /* XXX */
712 if (fs->fs_avgfpdir <= 0) /* XXX */
713 fs->fs_avgfpdir = AFPDIR; /* XXX */
714 mp->mnt_data = (qaddr_t)ump;
715 mp->mnt_stat.f_fsid.val[0] = fs->fs_id[0];
716 mp->mnt_stat.f_fsid.val[1] = fs->fs_id[1];
717 if (fs->fs_id[0] == 0 || fs->fs_id[1] == 0 ||
718 vfs_getvfs(&mp->mnt_stat.f_fsid))
720 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen;
721 mp->mnt_flag |= MNT_LOCAL;
724 ump->um_devvp = devvp;
725 ump->um_nindir = fs->fs_nindir;
726 ump->um_bptrtodb = fs->fs_fsbtodb;
727 ump->um_seqinc = fs->fs_frag;
728 for (i = 0; i < MAXQUOTAS; i++)
729 ump->um_quotas[i] = NULLVP;
730 dev->si_mountpoint = mp;
733 if( mp->mnt_flag & MNT_ROOTFS) {
735 * Root mount; update timestamp in mount structure.
736 * this will be used by the common root mount code
737 * to update the system clock.
739 mp->mnt_time = fs->fs_time;
742 ump->um_savedmaxfilesize = fs->fs_maxfilesize; /* XXX */
743 maxfilesize = (uint64_t)0x40000000 * fs->fs_bsize - 1; /* XXX */
744 /* Enforce limit caused by vm object backing (32 bits vm_pindex_t). */
745 if (maxfilesize > (uint64_t)0x80000000u * PAGE_SIZE - 1)
746 maxfilesize = (uint64_t)0x80000000u * PAGE_SIZE - 1;
747 if (fs->fs_maxfilesize > maxfilesize) /* XXX */
748 fs->fs_maxfilesize = maxfilesize; /* XXX */
750 if ((fs->fs_flags & FS_DOSOFTDEP) &&
751 (error = softdep_mount(devvp, mp, fs)) != 0) {
752 free(fs->fs_csp, M_UFSMNT);
757 (void) ffs_sbupdate(ump, MNT_WAIT);
759 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops, ffs_vnodeop_entries, VVF_SUPPORTS_FSMID);
760 vfs_add_vnodeops(mp, &mp->mnt_vn_spec_ops, ffs_specop_entries, VVF_SUPPORTS_FSMID);
761 vfs_add_vnodeops(mp, &mp->mnt_vn_fifo_ops, ffs_fifoop_entries, VVF_SUPPORTS_FSMID);
765 dev->si_mountpoint = NULL;
768 VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, td);
770 free(ump->um_fs, M_UFSMNT);
772 mp->mnt_data = (qaddr_t)0;
778 * Sanity checks for old filesystems.
780 * XXX - goes away some day.
783 ffs_oldfscompat(struct fs *fs)
785 fs->fs_npsect = max(fs->fs_npsect, fs->fs_nsect); /* XXX */
786 fs->fs_interleave = max(fs->fs_interleave, 1); /* XXX */
787 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
788 fs->fs_nrpos = 8; /* XXX */
789 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
792 uint64_t sizepb = fs->fs_bsize; /* XXX */
794 fs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */
795 for (i = 0; i < NIADDR; i++) { /* XXX */
796 sizepb *= NINDIR(fs); /* XXX */
797 fs->fs_maxfilesize += sizepb; /* XXX */
800 fs->fs_maxfilesize = (u_quad_t) 1LL << 39;
801 fs->fs_qbmask = ~fs->fs_bmask; /* XXX */
802 fs->fs_qfmask = ~fs->fs_fmask; /* XXX */
808 * unmount system call
811 ffs_unmount(struct mount *mp, int mntflags, struct thread *td)
813 struct ufsmount *ump;
818 if (mntflags & MNT_FORCE) {
821 if (mp->mnt_flag & MNT_SOFTDEP) {
822 if ((error = softdep_flushfiles(mp, flags, td)) != 0)
825 if ((error = ffs_flushfiles(mp, flags, td)) != 0)
830 if (fs->fs_ronly == 0) {
831 fs->fs_clean = fs->fs_flags & FS_UNCLEAN ? 0 : 1;
832 error = ffs_sbupdate(ump, MNT_WAIT);
838 ump->um_devvp->v_rdev->si_mountpoint = NULL;
840 vinvalbuf(ump->um_devvp, V_SAVE, td, 0, 0);
841 error = VOP_CLOSE(ump->um_devvp, fs->fs_ronly ? FREAD : FREAD|FWRITE, td);
843 vrele(ump->um_devvp);
845 free(fs->fs_csp, M_UFSMNT);
848 mp->mnt_data = (qaddr_t)0;
849 mp->mnt_flag &= ~MNT_LOCAL;
854 * Flush out all the files in a filesystem.
857 ffs_flushfiles(struct mount *mp, int flags, struct thread *td)
859 struct ufsmount *ump;
864 if (mp->mnt_flag & MNT_QUOTA) {
866 error = vflush(mp, 0, SKIPSYSTEM|flags);
869 /* Find out how many quota files we have open. */
870 for (i = 0; i < MAXQUOTAS; i++) {
871 if (ump->um_quotas[i] == NULLVP)
876 * Here we fall through to vflush again to ensure
877 * that we have gotten rid of all the system vnodes.
882 * Flush all the files.
884 if ((error = vflush(mp, 0, flags)) != 0)
887 * Flush filesystem metadata.
889 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td);
890 error = VOP_FSYNC(ump->um_devvp, MNT_WAIT, td);
891 VOP_UNLOCK(ump->um_devvp, 0, td);
896 * Get filesystem statistics.
899 ffs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
901 struct ufsmount *ump;
906 if (fs->fs_magic != FS_MAGIC)
908 sbp->f_bsize = fs->fs_fsize;
909 sbp->f_iosize = fs->fs_bsize;
910 sbp->f_blocks = fs->fs_dsize;
911 sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag +
912 fs->fs_cstotal.cs_nffree;
913 sbp->f_bavail = freespace(fs, fs->fs_minfree);
914 sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO;
915 sbp->f_ffree = fs->fs_cstotal.cs_nifree;
916 if (sbp != &mp->mnt_stat) {
917 sbp->f_type = mp->mnt_vfc->vfc_typenum;
918 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
919 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
925 * Go through the disk queues to initiate sandbagged IO;
926 * go through the inodes to write those that have been modified;
927 * initiate the writing of the super block if it has been modified.
929 * Note: we are always called with the filesystem marked `MPBUSY'.
933 static int ffs_sync_scan1(struct mount *mp, struct vnode *vp, void *data);
934 static int ffs_sync_scan2(struct mount *mp, struct vnode *vp, void *data);
937 ffs_sync(struct mount *mp, int waitfor, struct thread *td)
939 struct ufsmount *ump = VFSTOUFS(mp);
942 struct scaninfo scaninfo;
945 if (fs->fs_fmod != 0 && fs->fs_ronly != 0) { /* XXX */
946 printf("fs = %s\n", fs->fs_fsmnt);
947 panic("ffs_sync: rofs mod");
951 * Write back each (modified) inode.
953 scaninfo.allerror = 0;
955 scaninfo.waitfor = waitfor;
956 while (scaninfo.rescan) {
958 vmntvnodescan(mp, VMSC_GETVP|VMSC_NOWAIT,
959 ffs_sync_scan1, ffs_sync_scan2, &scaninfo);
963 * Force stale filesystem control information to be flushed.
965 if (waitfor != MNT_LAZY) {
966 if (ump->um_mountp->mnt_flag & MNT_SOFTDEP)
967 waitfor = MNT_NOWAIT;
968 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td);
969 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
970 scaninfo.allerror = error;
971 VOP_UNLOCK(ump->um_devvp, 0, td);
977 * Write back modified superblock.
979 if (fs->fs_fmod != 0 && (error = ffs_sbupdate(ump, waitfor)) != 0)
980 scaninfo.allerror = error;
981 return (scaninfo.allerror);
985 ffs_sync_scan1(struct mount *mp, struct vnode *vp, void *data)
990 * Depend on the mount list's vnode lock to keep things stable
991 * enough for a quick test. Since there might be hundreds of
992 * thousands of vnodes, we cannot afford even a subroutine
993 * call unless there's a good chance that we have work to do.
996 /* Restart out whole search if this guy is locked
997 * or is being reclaimed.
999 if (vp->v_type == VNON || ((ip->i_flag &
1000 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
1001 RB_EMPTY(&vp->v_rbdirty_tree))) {
1008 ffs_sync_scan2(struct mount *mp, struct vnode *vp, void *data)
1010 struct scaninfo *info = data;
1011 thread_t td = curthread; /* XXX */
1016 * We have to recheck after having obtained the vnode interlock.
1019 if (vp->v_type == VNON || ((ip->i_flag &
1020 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
1021 RB_EMPTY(&vp->v_rbdirty_tree))) {
1024 if (vp->v_type != VCHR) {
1025 if ((error = VOP_FSYNC(vp, info->waitfor, td)) != 0)
1026 info->allerror = error;
1029 * We must reference the vp to prevent it from
1030 * getting ripped out from under UFS_UPDATE, since
1031 * we are not holding a vnode lock.
1033 /* UFS_UPDATE(vp, waitfor == MNT_WAIT); */
1040 * Look up a FFS dinode number to find its incore vnode, otherwise read it
1041 * in from disk. If it is in core, wait for the lock bit to clear, then
1042 * return the inode locked. Detection and handling of mount points must be
1043 * done by the calling routine.
1047 ffs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
1051 struct ufsmount *ump;
1060 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) {
1065 * If this MALLOC() is performed after the getnewvnode()
1066 * it might block, leaving a vnode with a NULL v_data to be
1067 * found by ffs_sync() if a sync happens to fire right then,
1068 * which will cause a panic because ffs_sync() blindly
1069 * dereferences vp->v_data (as well it should).
1071 * XXX this may no longer be true since getnewvnode returns a
1072 * VX locked vnode now.
1074 MALLOC(ip, struct inode *, sizeof(struct inode),
1075 ump->um_malloctype, M_WAITOK);
1077 /* Allocate a new vnode/inode. */
1078 error = getnewvnode(VT_UFS, mp, &vp, VLKTIMEOUT, LK_CANRECURSE);
1081 free(ip, ump->um_malloctype);
1084 bzero((caddr_t)ip, sizeof(struct inode));
1086 ip->i_fs = fs = ump->um_fs;
1092 for (i = 0; i < MAXQUOTAS; i++)
1093 ip->i_dquot[i] = NODQUOT;
1098 * Insert it into the inode hash table and check for a collision.
1099 * If a collision occurs, throw away the vnode and try again.
1101 if (ufs_ihashins(ip) != 0) {
1102 printf("debug: ufs ihashins collision, retrying inode %ld\n",
1103 (long)ip->i_number);
1105 free(ip, ump->um_malloctype);
1110 /* Read in the disk contents for the inode, copy into the inode. */
1111 error = bread(ump->um_devvp, fsbtodoff(fs, ino_to_fsba(fs, ino)),
1112 (int)fs->fs_bsize, &bp);
1115 * The inode does not contain anything useful, so it would
1116 * be misleading to leave it on its hash chain. With mode
1117 * still zero, it will be unlinked and returned to the free
1125 ip->i_din = *((struct dinode *)bp->b_data + ino_to_fsbo(fs, ino));
1126 if (DOINGSOFTDEP(vp))
1127 softdep_load_inodeblock(ip);
1129 ip->i_effnlink = ip->i_nlink;
1133 * Initialize the vnode from the inode, check for aliases.
1134 * Note that the underlying vnode may have changed.
1136 error = ufs_vinit(mp, &vp);
1143 * Finish inode initialization now that aliasing has been resolved.
1145 ip->i_devvp = ump->um_devvp;
1148 * Set up a generation number for this inode if it does not
1149 * already have one. This should only happen on old filesystems.
1151 if (ip->i_gen == 0) {
1152 ip->i_gen = random() / 2 + 1;
1153 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1154 ip->i_flag |= IN_MODIFIED;
1157 * Ensure that uid and gid are correct. This is a temporary
1158 * fix until fsck has been changed to do the update.
1160 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
1161 ip->i_uid = ip->i_din.di_ouid; /* XXX */
1162 ip->i_gid = ip->i_din.di_ogid; /* XXX */
1166 * return a VX locked and refd vnode (VX == same as normal vget()
1167 * vnode so we are ok)
1174 * File handle to vnode
1176 * Have to be really careful about stale file handles:
1177 * - check that the inode number is valid
1178 * - call ffs_vget() to get the locked inode
1179 * - check for an unallocated inode (i_mode == 0)
1180 * - check that the given client host has export rights and return
1181 * those rights via. exflagsp and credanonp
1184 ffs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
1189 ufhp = (struct ufid *)fhp;
1190 fs = VFSTOUFS(mp)->um_fs;
1191 if (ufhp->ufid_ino < ROOTINO ||
1192 ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg)
1194 return (ufs_fhtovp(mp, ufhp, vpp));
1198 * Vnode pointer to File handle
1202 ffs_vptofh(struct vnode *vp, struct fid *fhp)
1208 ufhp = (struct ufid *)fhp;
1209 ufhp->ufid_len = sizeof(struct ufid);
1210 ufhp->ufid_ino = ip->i_number;
1211 ufhp->ufid_gen = ip->i_gen;
1216 * Initialize the filesystem; just use ufs_init.
1219 ffs_init(struct vfsconf *vfsp)
1221 softdep_initialize();
1222 return (ufs_init(vfsp));
1226 * Write a superblock and associated information back to disk.
1229 ffs_sbupdate(struct ufsmount *mp, int waitfor)
1231 struct fs *dfs, *fs = mp->um_fs;
1235 int i, size, error, allerror = 0;
1238 * First write back the summary information.
1240 * NOTE: the getblk is relative to the device vnode so bio1
1241 * contains the device block number.
1243 blks = howmany(fs->fs_cssize, fs->fs_fsize);
1245 for (i = 0; i < blks; i += fs->fs_frag) {
1246 size = fs->fs_bsize;
1247 if (i + fs->fs_frag > blks)
1248 size = (blks - i) * fs->fs_fsize;
1249 bp = getblk(mp->um_devvp, fsbtodoff(fs, fs->fs_csaddr + i),
1251 bcopy(space, bp->b_data, (uint)size);
1252 space = (char *)space + size;
1253 if (waitfor != MNT_WAIT)
1255 else if ((error = bwrite(bp)) != 0)
1259 * Now write back the superblock itself. If any errors occurred
1260 * up to this point, then fail so that the superblock avoids
1261 * being written out as clean.
1265 bp = getblk(mp->um_devvp, SBOFF, (int)fs->fs_sbsize, 0, 0);
1267 fs->fs_time = time_second;
1268 bcopy((caddr_t)fs, bp->b_data, (uint)fs->fs_sbsize);
1269 /* Restore compatibility to old filesystems. XXX */
1270 dfs = (struct fs *)bp->b_data; /* XXX */
1271 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
1272 dfs->fs_nrpos = -1; /* XXX */
1273 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
1274 int32_t *lp, tmp; /* XXX */
1276 lp = (int32_t *)&dfs->fs_qbmask; /* XXX */
1277 tmp = lp[4]; /* XXX */
1278 for (i = 4; i > 0; i--) /* XXX */
1279 lp[i] = lp[i-1]; /* XXX */
1280 lp[0] = tmp; /* XXX */
1282 dfs->fs_maxfilesize = mp->um_savedmaxfilesize; /* XXX */
1283 if (waitfor != MNT_WAIT)
1285 else if ((error = bwrite(bp)) != 0)