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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 1.11 2003/08/20 09:56:34 rob 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>
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,
71 struct nameidata *, struct thread *);
72 static int ffs_init (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;
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;
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 lwkt_gettoken(&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;
523 gen = lwkt_gettoken(&mntvnode_token);
525 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) {
526 if (vp->v_mount != mp) {
527 lwkt_gentoken(&mntvnode_token, &gen);
530 nvp = TAILQ_NEXT(vp, v_nmntvnodes);
532 * Step 4: invalidate all inactive vnodes.
534 if (vrecycle(vp, NULL, td)) {
535 lwkt_gentoken(&mntvnode_token, &gen);
539 * Step 5: invalidate all cached file data.
541 vgen = lwkt_gettoken(&vp->v_interlock);
542 if (lwkt_gentoken(&mntvnode_token, &gen) != 0 ||
543 lwkt_gentoken(&vp->v_interlock, &vgen) != 0) {
544 lwkt_reltoken(&vp->v_interlock);
545 lwkt_gentoken(&mntvnode_token, &gen);
548 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
549 lwkt_gentoken(&mntvnode_token, &gen);
552 if (vinvalbuf(vp, 0, td, 0, 0))
553 panic("ffs_reload: dirty2");
555 * Step 6: re-read inode data for all active vnodes.
559 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
560 (int)fs->fs_bsize, &bp);
563 lwkt_reltoken(&mntvnode_token);
566 ip->i_din = *((struct dinode *)bp->b_data +
567 ino_to_fsbo(fs, ip->i_number));
568 ip->i_effnlink = ip->i_nlink;
572 lwkt_reltoken(&mntvnode_token);
577 * Common code for mount and mountroot
580 ffs_mountfs(devvp, mp, td, malloctype)
584 struct malloc_type *malloctype;
586 struct ufsmount *ump;
590 struct partinfo dpart;
592 int error, i, blks, size, ronly;
594 u_int64_t maxfilesize; /* XXX */
600 * Disallow multiple mounts of the same device.
601 * Disallow mounting of a device that is currently in use
602 * (except for root, which might share swap device for miniroot).
603 * Flush out any old buffers remaining from a previous use.
605 error = vfs_mountedon(devvp);
608 ncount = vcount(devvp);
610 if (ncount > 1 && devvp != rootvp)
612 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
613 error = vinvalbuf(devvp, V_SAVE, td, 0, 0);
614 VOP_UNLOCK(devvp, 0, td);
619 * Only VMIO the backing device if the backing device is a real
620 * block device. This excludes the original MFS implementation.
621 * Note that it is optional that the backing device be VMIOed. This
622 * increases the opportunity for metadata caching.
624 if (devvp->v_tag != VT_MFS && vn_isdisk(devvp, NULL)) {
625 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
626 vfs_object_create(devvp, td);
627 lwkt_gettoken(&devvp->v_interlock);
628 VOP_UNLOCK(devvp, LK_INTERLOCK, td);
631 ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
632 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
633 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td);
634 VOP_UNLOCK(devvp, 0, td);
637 if (devvp->v_rdev->si_iosize_max != 0)
638 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
639 if (mp->mnt_iosize_max > MAXPHYS)
640 mp->mnt_iosize_max = MAXPHYS;
642 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, proc0.p_ucred, td) != 0)
645 size = dpart.disklab->d_secsize;
649 if ((error = bread(devvp, SBLOCK, SBSIZE, &bp)) != 0)
651 fs = (struct fs *)bp->b_data;
652 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
653 fs->fs_bsize < sizeof(struct fs)) {
654 error = EINVAL; /* XXX needs translation */
658 fs->fs_flags &= ~FS_UNCLEAN;
659 if (fs->fs_clean == 0) {
660 fs->fs_flags |= FS_UNCLEAN;
661 if (ronly || (mp->mnt_flag & MNT_FORCE)) {
663 "WARNING: %s was not properly dismounted\n",
667 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
673 /* XXX updating 4.2 FFS superblocks trashes rotational layout tables */
674 if (fs->fs_postblformat == FS_42POSTBLFMT && !ronly) {
675 error = EROFS; /* needs translation */
678 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
679 bzero((caddr_t)ump, sizeof *ump);
680 ump->um_malloctype = malloctype;
681 ump->um_i_effnlink_valid = 1;
682 ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT,
684 ump->um_blkatoff = ffs_blkatoff;
685 ump->um_truncate = ffs_truncate;
686 ump->um_update = ffs_update;
687 ump->um_valloc = ffs_valloc;
688 ump->um_vfree = ffs_vfree;
689 bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize);
690 if (fs->fs_sbsize < SBSIZE)
691 bp->b_flags |= B_INVAL;
695 fs->fs_ronly = ronly;
696 size = fs->fs_cssize;
697 blks = howmany(size, fs->fs_fsize);
698 if (fs->fs_contigsumsize > 0)
699 size += fs->fs_ncg * sizeof(int32_t);
700 size += fs->fs_ncg * sizeof(u_int8_t);
701 space = malloc((u_long)size, M_UFSMNT, M_WAITOK);
703 for (i = 0; i < blks; i += fs->fs_frag) {
705 if (i + fs->fs_frag > blks)
706 size = (blks - i) * fs->fs_fsize;
707 if ((error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size,
709 free(fs->fs_csp, M_UFSMNT);
712 bcopy(bp->b_data, space, (u_int)size);
713 space = (char *)space + size;
717 if (fs->fs_contigsumsize > 0) {
718 fs->fs_maxcluster = lp = space;
719 for (i = 0; i < fs->fs_ncg; i++)
720 *lp++ = fs->fs_contigsumsize;
723 size = fs->fs_ncg * sizeof(u_int8_t);
724 fs->fs_contigdirs = (u_int8_t *)space;
725 bzero(fs->fs_contigdirs, size);
726 /* Compatibility for old filesystems XXX */
727 if (fs->fs_avgfilesize <= 0) /* XXX */
728 fs->fs_avgfilesize = AVFILESIZ; /* XXX */
729 if (fs->fs_avgfpdir <= 0) /* XXX */
730 fs->fs_avgfpdir = AFPDIR; /* XXX */
731 mp->mnt_data = (qaddr_t)ump;
732 mp->mnt_stat.f_fsid.val[0] = fs->fs_id[0];
733 mp->mnt_stat.f_fsid.val[1] = fs->fs_id[1];
734 if (fs->fs_id[0] == 0 || fs->fs_id[1] == 0 ||
735 vfs_getvfs(&mp->mnt_stat.f_fsid))
737 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen;
738 mp->mnt_flag |= MNT_LOCAL;
741 ump->um_devvp = devvp;
742 ump->um_nindir = fs->fs_nindir;
743 ump->um_bptrtodb = fs->fs_fsbtodb;
744 ump->um_seqinc = fs->fs_frag;
745 for (i = 0; i < MAXQUOTAS; i++)
746 ump->um_quotas[i] = NULLVP;
747 devvp->v_specmountpoint = mp;
751 * Set FS local "last mounted on" information (NULL pad)
753 copystr( mp->mnt_stat.f_mntonname, /* mount point*/
754 fs->fs_fsmnt, /* copy area*/
755 sizeof(fs->fs_fsmnt) - 1, /* max size*/
756 &strsize); /* real size*/
757 bzero( fs->fs_fsmnt + strsize, sizeof(fs->fs_fsmnt) - strsize);
759 if( mp->mnt_flag & MNT_ROOTFS) {
761 * Root mount; update timestamp in mount structure.
762 * this will be used by the common root mount code
763 * to update the system clock.
765 mp->mnt_time = fs->fs_time;
768 ump->um_savedmaxfilesize = fs->fs_maxfilesize; /* XXX */
769 maxfilesize = (u_int64_t)0x40000000 * fs->fs_bsize - 1; /* XXX */
770 /* Enforce limit caused by vm object backing (32 bits vm_pindex_t). */
771 if (maxfilesize > (u_int64_t)0x80000000u * PAGE_SIZE - 1)
772 maxfilesize = (u_int64_t)0x80000000u * PAGE_SIZE - 1;
773 if (fs->fs_maxfilesize > maxfilesize) /* XXX */
774 fs->fs_maxfilesize = maxfilesize; /* XXX */
776 if ((fs->fs_flags & FS_DOSOFTDEP) &&
777 (error = softdep_mount(devvp, mp, fs)) != 0) {
778 free(fs->fs_csp, M_UFSMNT);
783 (void) ffs_sbupdate(ump, MNT_WAIT);
787 devvp->v_specmountpoint = NULL;
790 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, td);
792 free(ump->um_fs, M_UFSMNT);
794 mp->mnt_data = (qaddr_t)0;
800 * Sanity checks for old file systems.
802 * XXX - goes away some day.
809 fs->fs_npsect = max(fs->fs_npsect, fs->fs_nsect); /* XXX */
810 fs->fs_interleave = max(fs->fs_interleave, 1); /* XXX */
811 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
812 fs->fs_nrpos = 8; /* XXX */
813 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
816 u_int64_t sizepb = fs->fs_bsize; /* XXX */
818 fs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */
819 for (i = 0; i < NIADDR; i++) { /* XXX */
820 sizepb *= NINDIR(fs); /* XXX */
821 fs->fs_maxfilesize += sizepb; /* XXX */
824 fs->fs_maxfilesize = (u_quad_t) 1LL << 39;
825 fs->fs_qbmask = ~fs->fs_bmask; /* XXX */
826 fs->fs_qfmask = ~fs->fs_fmask; /* XXX */
832 * unmount system call
835 ffs_unmount(struct mount *mp, int mntflags, struct thread *td)
837 struct ufsmount *ump;
842 if (mntflags & MNT_FORCE) {
845 if (mp->mnt_flag & MNT_SOFTDEP) {
846 if ((error = softdep_flushfiles(mp, flags, td)) != 0)
849 if ((error = ffs_flushfiles(mp, flags, td)) != 0)
854 if (fs->fs_ronly == 0) {
855 fs->fs_clean = fs->fs_flags & FS_UNCLEAN ? 0 : 1;
856 error = ffs_sbupdate(ump, MNT_WAIT);
862 ump->um_devvp->v_specmountpoint = NULL;
864 vinvalbuf(ump->um_devvp, V_SAVE, td, 0, 0);
865 error = VOP_CLOSE(ump->um_devvp, fs->fs_ronly ? FREAD : FREAD|FWRITE, td);
867 vrele(ump->um_devvp);
869 free(fs->fs_csp, M_UFSMNT);
872 mp->mnt_data = (qaddr_t)0;
873 mp->mnt_flag &= ~MNT_LOCAL;
878 * Flush out all the files in a filesystem.
881 ffs_flushfiles(struct mount *mp, int flags, struct thread *td)
883 struct ufsmount *ump;
888 if (mp->mnt_flag & MNT_QUOTA) {
890 error = vflush(mp, 0, SKIPSYSTEM|flags);
893 for (i = 0; i < MAXQUOTAS; i++) {
894 if (ump->um_quotas[i] == NULLVP)
899 * Here we fall through to vflush again to ensure
900 * that we have gotten rid of all the system vnodes.
905 * Flush all the files.
907 if ((error = vflush(mp, 0, flags)) != 0)
910 * Flush filesystem metadata.
912 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td);
913 error = VOP_FSYNC(ump->um_devvp, MNT_WAIT, td);
914 VOP_UNLOCK(ump->um_devvp, 0, td);
919 * Get file system statistics.
922 ffs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
924 struct ufsmount *ump;
929 if (fs->fs_magic != FS_MAGIC)
931 sbp->f_bsize = fs->fs_fsize;
932 sbp->f_iosize = fs->fs_bsize;
933 sbp->f_blocks = fs->fs_dsize;
934 sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag +
935 fs->fs_cstotal.cs_nffree;
936 sbp->f_bavail = freespace(fs, fs->fs_minfree);
937 sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO;
938 sbp->f_ffree = fs->fs_cstotal.cs_nifree;
939 if (sbp != &mp->mnt_stat) {
940 sbp->f_type = mp->mnt_vfc->vfc_typenum;
941 bcopy((caddr_t)mp->mnt_stat.f_mntonname,
942 (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
943 bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
944 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
950 * Go through the disk queues to initiate sandbagged IO;
951 * go through the inodes to write those that have been modified;
952 * initiate the writing of the super block if it has been modified.
954 * Note: we are always called with the filesystem marked `MPBUSY'.
957 ffs_sync(struct mount *mp, int waitfor, struct thread *td)
959 struct vnode *nvp, *vp;
961 struct ufsmount *ump = VFSTOUFS(mp);
963 int error, allerror = 0;
966 if (fs->fs_fmod != 0 && fs->fs_ronly != 0) { /* XXX */
967 printf("fs = %s\n", fs->fs_fsmnt);
968 panic("ffs_sync: rofs mod");
971 * Write back each (modified) inode.
973 lwkt_gettoken(&mntvnode_token);
975 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) {
977 * If the vnode that we are about to sync is no longer
978 * associated with this mount point, start over.
980 if (vp->v_mount != mp)
984 * Depend on the mntvnode_token to keep things stable enough
985 * for a quick test. Since there might be hundreds of
986 * thousands of vnodes, we cannot afford even a subroutine
987 * call unless there's a good chance that we have work to do.
989 nvp = TAILQ_NEXT(vp, v_nmntvnodes);
991 if (vp->v_type == VNON || ((ip->i_flag &
992 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
993 TAILQ_EMPTY(&vp->v_dirtyblkhd))) {
996 if (vp->v_type != VCHR) {
997 lwkt_reltoken(&mntvnode_token);
998 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT, td);
1000 lwkt_gettoken(&mntvnode_token);
1001 if (error == ENOENT)
1004 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
1006 VOP_UNLOCK(vp, 0, td);
1008 lwkt_gettoken(&mntvnode_token);
1012 * We must reference the vp to prevent it from
1013 * getting ripped out from under UFS_UPDATE, since
1014 * we are not holding a vnode lock. XXX why aren't
1015 * we holding a vnode lock?
1018 lwkt_reltoken(&mntvnode_token);
1019 /* UFS_UPDATE(vp, waitfor == MNT_WAIT); */
1022 lwkt_gettoken(&mntvnode_token);
1024 if (TAILQ_NEXT(vp, v_nmntvnodes) != nvp)
1027 lwkt_reltoken(&mntvnode_token);
1029 * Force stale file system control information to be flushed.
1031 if (waitfor != MNT_LAZY) {
1032 if (ump->um_mountp->mnt_flag & MNT_SOFTDEP)
1033 waitfor = MNT_NOWAIT;
1034 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td);
1035 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
1037 VOP_UNLOCK(ump->um_devvp, 0, td);
1043 * Write back modified superblock.
1045 if (fs->fs_fmod != 0 && (error = ffs_sbupdate(ump, waitfor)) != 0)
1051 * Look up a FFS dinode number to find its incore vnode, otherwise read it
1052 * in from disk. If it is in core, wait for the lock bit to clear, then
1053 * return the inode locked. Detection and handling of mount points must be
1054 * done by the calling routine.
1056 static int ffs_inode_hash_lock;
1059 ffs_vget(mp, ino, vpp)
1066 struct ufsmount *ump;
1075 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) {
1080 * Lock out the creation of new entries in the FFS hash table in
1081 * case getnewvnode() or MALLOC() blocks, otherwise a duplicate
1084 if (ffs_inode_hash_lock) {
1085 while (ffs_inode_hash_lock) {
1086 ffs_inode_hash_lock = -1;
1087 tsleep(&ffs_inode_hash_lock, 0, "ffsvgt", 0);
1091 ffs_inode_hash_lock = 1;
1094 * If this MALLOC() is performed after the getnewvnode()
1095 * it might block, leaving a vnode with a NULL v_data to be
1096 * found by ffs_sync() if a sync happens to fire right then,
1097 * which will cause a panic because ffs_sync() blindly
1098 * dereferences vp->v_data (as well it should).
1100 MALLOC(ip, struct inode *, sizeof(struct inode),
1101 ump->um_malloctype, M_WAITOK);
1103 /* Allocate a new vnode/inode. */
1104 error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp);
1106 if (ffs_inode_hash_lock < 0)
1107 wakeup(&ffs_inode_hash_lock);
1108 ffs_inode_hash_lock = 0;
1110 FREE(ip, ump->um_malloctype);
1113 bzero((caddr_t)ip, sizeof(struct inode));
1114 lockinit(&ip->i_lock, 0, "inode", VLKTIMEOUT, LK_CANRECURSE);
1117 * FFS supports lock sharing in the stack of vnodes
1119 vp->v_vnlock = &ip->i_lock;
1121 ip->i_fs = fs = ump->um_fs;
1127 for (i = 0; i < MAXQUOTAS; i++)
1128 ip->i_dquot[i] = NODQUOT;
1132 * Put it onto its hash chain and lock it so that other requests for
1133 * this inode will block if they arrive while we are sleeping waiting
1134 * for old data structures to be purged or for the contents of the
1135 * disk portion of this inode to be read.
1139 if (ffs_inode_hash_lock < 0)
1140 wakeup(&ffs_inode_hash_lock);
1141 ffs_inode_hash_lock = 0;
1143 /* Read in the disk contents for the inode, copy into the inode. */
1144 error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
1145 (int)fs->fs_bsize, &bp);
1148 * The inode does not contain anything useful, so it would
1149 * be misleading to leave it on its hash chain. With mode
1150 * still zero, it will be unlinked and returned to the free
1158 ip->i_din = *((struct dinode *)bp->b_data + ino_to_fsbo(fs, ino));
1159 if (DOINGSOFTDEP(vp))
1160 softdep_load_inodeblock(ip);
1162 ip->i_effnlink = ip->i_nlink;
1166 * Initialize the vnode from the inode, check for aliases.
1167 * Note that the underlying vnode may have changed.
1169 error = ufs_vinit(mp, ffs_specop_p, ffs_fifoop_p, &vp);
1176 * Finish inode initialization now that aliasing has been resolved.
1178 ip->i_devvp = ump->um_devvp;
1181 * Set up a generation number for this inode if it does not
1182 * already have one. This should only happen on old filesystems.
1184 if (ip->i_gen == 0) {
1185 ip->i_gen = random() / 2 + 1;
1186 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
1187 ip->i_flag |= IN_MODIFIED;
1190 * Ensure that uid and gid are correct. This is a temporary
1191 * fix until fsck has been changed to do the update.
1193 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
1194 ip->i_uid = ip->i_din.di_ouid; /* XXX */
1195 ip->i_gid = ip->i_din.di_ogid; /* XXX */
1203 * File handle to vnode
1205 * Have to be really careful about stale file handles:
1206 * - check that the inode number is valid
1207 * - call ffs_vget() to get the locked inode
1208 * - check for an unallocated inode (i_mode == 0)
1209 * - check that the given client host has export rights and return
1210 * those rights via. exflagsp and credanonp
1213 ffs_fhtovp(mp, fhp, vpp)
1221 ufhp = (struct ufid *)fhp;
1222 fs = VFSTOUFS(mp)->um_fs;
1223 if (ufhp->ufid_ino < ROOTINO ||
1224 ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg)
1226 return (ufs_fhtovp(mp, ufhp, vpp));
1230 * Vnode pointer to File handle
1242 ufhp = (struct ufid *)fhp;
1243 ufhp->ufid_len = sizeof(struct ufid);
1244 ufhp->ufid_ino = ip->i_number;
1245 ufhp->ufid_gen = ip->i_gen;
1250 * Initialize the filesystem; just use ufs_init.
1254 struct vfsconf *vfsp;
1257 softdep_initialize();
1258 return (ufs_init(vfsp));
1262 * Write a superblock and associated information back to disk.
1265 ffs_sbupdate(mp, waitfor)
1266 struct ufsmount *mp;
1269 struct fs *dfs, *fs = mp->um_fs;
1273 int i, size, error, allerror = 0;
1276 * First write back the summary information.
1278 blks = howmany(fs->fs_cssize, fs->fs_fsize);
1280 for (i = 0; i < blks; i += fs->fs_frag) {
1281 size = fs->fs_bsize;
1282 if (i + fs->fs_frag > blks)
1283 size = (blks - i) * fs->fs_fsize;
1284 bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i),
1286 bcopy(space, bp->b_data, (u_int)size);
1287 space = (char *)space + size;
1288 if (waitfor != MNT_WAIT)
1290 else if ((error = bwrite(bp)) != 0)
1294 * Now write back the superblock itself. If any errors occurred
1295 * up to this point, then fail so that the superblock avoids
1296 * being written out as clean.
1300 bp = getblk(mp->um_devvp, SBLOCK, (int)fs->fs_sbsize, 0, 0);
1302 fs->fs_time = time_second;
1303 bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize);
1304 /* Restore compatibility to old file systems. XXX */
1305 dfs = (struct fs *)bp->b_data; /* XXX */
1306 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
1307 dfs->fs_nrpos = -1; /* XXX */
1308 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
1309 int32_t *lp, tmp; /* XXX */
1311 lp = (int32_t *)&dfs->fs_qbmask; /* XXX */
1312 tmp = lp[4]; /* XXX */
1313 for (i = 4; i > 0; i--) /* XXX */
1314 lp[i] = lp[i-1]; /* XXX */
1315 lp[0] = tmp; /* XXX */
1317 dfs->fs_maxfilesize = mp->um_savedmaxfilesize; /* XXX */
1318 if (waitfor != MNT_WAIT)
1320 else if ((error = bwrite(bp)) != 0)