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1.1 root 1: /*
2: * Copyright (c) 1989, 1991 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
1.1.1.3 ! root 33: * from: @(#)ufs_vfsops.c 7.56 (Berkeley) 6/28/91
! 34: * ufs_vfsops.c,v 1.2 1993/05/20 03:53:45 cgd Exp
1.1 root 35: */
36:
37: #include "param.h"
38: #include "systm.h"
39: #include "namei.h"
40: #include "proc.h"
41: #include "kernel.h"
42: #include "vnode.h"
43: #include "specdev.h"
44: #include "mount.h"
45: #include "buf.h"
46: #include "file.h"
1.1.1.2 root 47: #include "dkbad.h" /* XXX */
1.1 root 48: #include "disklabel.h"
49: #include "ioctl.h"
50: #include "errno.h"
51: #include "malloc.h"
52:
53: #include "quota.h"
54: #include "fs.h"
55: #include "ufsmount.h"
56: #include "inode.h"
57:
58: struct vfsops ufs_vfsops = {
59: ufs_mount,
60: ufs_start,
61: ufs_unmount,
62: ufs_root,
63: ufs_quotactl,
64: ufs_statfs,
65: ufs_sync,
66: ufs_fhtovp,
67: ufs_vptofh,
68: ufs_init
69: };
70:
71: /*
72: * Flag to allow forcible unmounting.
73: */
74: int doforce = 1;
75:
76: /*
77: * Called by vfs_mountroot when ufs is going to be mounted as root.
78: *
79: * Name is updated by mount(8) after booting.
80: */
81: #define ROOTNAME "root_device"
82:
83: ufs_mountroot()
84: {
85: register struct mount *mp;
86: extern struct vnode *rootvp;
87: struct proc *p = curproc; /* XXX */
88: struct ufsmount *ump;
89: register struct fs *fs;
90: u_int size;
91: int error;
92:
93: mp = (struct mount *)malloc((u_long)sizeof(struct mount),
94: M_MOUNT, M_WAITOK);
95: mp->mnt_op = &ufs_vfsops;
96: mp->mnt_flag = MNT_RDONLY;
97: mp->mnt_exroot = 0;
98: mp->mnt_mounth = NULLVP;
99: error = mountfs(rootvp, mp, p);
100: if (error) {
101: free((caddr_t)mp, M_MOUNT);
102: return (error);
103: }
104: if (error = vfs_lock(mp)) {
105: (void)ufs_unmount(mp, 0, p);
106: free((caddr_t)mp, M_MOUNT);
107: return (error);
108: }
109: rootfs = mp;
110: mp->mnt_next = mp;
111: mp->mnt_prev = mp;
112: mp->mnt_vnodecovered = NULLVP;
113: ump = VFSTOUFS(mp);
114: fs = ump->um_fs;
115: bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
116: fs->fs_fsmnt[0] = '/';
117: bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
118: MNAMELEN);
119: (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
120: &size);
121: bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
122: (void) ufs_statfs(mp, &mp->mnt_stat, p);
123: vfs_unlock(mp);
124: inittodr(fs->fs_time);
125: return (0);
126: }
127:
128: /*
129: * VFS Operations.
130: *
131: * mount system call
132: */
133: ufs_mount(mp, path, data, ndp, p)
134: register struct mount *mp;
135: char *path;
136: caddr_t data;
137: struct nameidata *ndp;
138: struct proc *p;
139: {
140: struct vnode *devvp;
141: struct ufs_args args;
142: struct ufsmount *ump;
143: register struct fs *fs;
144: u_int size;
145: int error;
146:
147: if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
148: return (error);
149: /*
150: * Process export requests.
151: */
152: if ((args.exflags & MNT_EXPORTED) || (mp->mnt_flag & MNT_EXPORTED)) {
153: if (args.exflags & MNT_EXPORTED)
154: mp->mnt_flag |= MNT_EXPORTED;
155: else
156: mp->mnt_flag &= ~MNT_EXPORTED;
157: if (args.exflags & MNT_EXRDONLY)
158: mp->mnt_flag |= MNT_EXRDONLY;
159: else
160: mp->mnt_flag &= ~MNT_EXRDONLY;
161: mp->mnt_exroot = args.exroot;
162: }
163: /*
164: * If updating, check whether changing from read-only to
165: * read/write; if there is no device name, that's all we do.
166: */
167: if (mp->mnt_flag & MNT_UPDATE) {
168: ump = VFSTOUFS(mp);
169: fs = ump->um_fs;
170: if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
171: fs->fs_ronly = 0;
172: if (args.fspec == 0)
173: return (0);
174: }
175: /*
176: * Not an update, or updating the name: look up the name
177: * and verify that it refers to a sensible block device.
178: */
179: ndp->ni_nameiop = LOOKUP | FOLLOW;
180: ndp->ni_segflg = UIO_USERSPACE;
181: ndp->ni_dirp = args.fspec;
182: if (error = namei(ndp, p))
183: return (error);
184: devvp = ndp->ni_vp;
185: if (devvp->v_type != VBLK) {
186: vrele(devvp);
187: return (ENOTBLK);
188: }
189: if (major(devvp->v_rdev) >= nblkdev) {
190: vrele(devvp);
191: return (ENXIO);
192: }
193: if ((mp->mnt_flag & MNT_UPDATE) == 0)
194: error = mountfs(devvp, mp, p);
195: else {
196: if (devvp != ump->um_devvp)
197: error = EINVAL; /* needs translation */
198: else
199: vrele(devvp);
200: }
201: if (error) {
202: vrele(devvp);
203: return (error);
204: }
205: ump = VFSTOUFS(mp);
206: fs = ump->um_fs;
207: (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
208: bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
209: bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
210: MNAMELEN);
211: (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
212: &size);
213: bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
214: (void) ufs_statfs(mp, &mp->mnt_stat, p);
215: return (0);
216: }
217:
218: /*
219: * Common code for mount and mountroot
220: */
221: mountfs(devvp, mp, p)
222: register struct vnode *devvp;
223: struct mount *mp;
224: struct proc *p;
225: {
226: register struct ufsmount *ump = (struct ufsmount *)0;
227: struct buf *bp = NULL;
228: register struct fs *fs;
229: dev_t dev = devvp->v_rdev;
230: struct partinfo dpart;
231: caddr_t base, space;
232: int havepart = 0, blks;
233: int error, i, size;
234: int needclose = 0;
235: int ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
236: extern struct vnode *rootvp;
237:
238: /*
239: * Disallow multiple mounts of the same device.
240: * Disallow mounting of a device that is currently in use
241: * (except for root, which might share swap device for miniroot).
242: * Flush out any old buffers remaining from a previous use.
243: */
244: if (error = mountedon(devvp))
245: return (error);
246: if (vcount(devvp) > 1 && devvp != rootvp)
247: return (EBUSY);
248: vinvalbuf(devvp, 1);
249: if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p))
250: return (error);
251: needclose = 1;
252: if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
253: size = DEV_BSIZE;
254: else {
255: havepart = 1;
256: size = dpart.disklab->d_secsize;
257: }
258: if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
259: goto out;
260: fs = bp->b_un.b_fs;
261: if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
262: fs->fs_bsize < sizeof(struct fs)) {
263: error = EINVAL; /* XXX needs translation */
264: goto out;
265: }
266: ump = (struct ufsmount *)malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
267: ump->um_fs = (struct fs *)malloc((u_long)fs->fs_sbsize, M_SUPERBLK,
268: M_WAITOK);
269: bcopy((caddr_t)bp->b_un.b_addr, (caddr_t)ump->um_fs,
270: (u_int)fs->fs_sbsize);
271: if (fs->fs_sbsize < SBSIZE)
272: bp->b_flags |= B_INVAL;
273: brelse(bp);
274: bp = NULL;
275: fs = ump->um_fs;
276: fs->fs_ronly = ronly;
277: if (ronly == 0)
278: fs->fs_fmod = 1;
279: if (havepart) {
280: dpart.part->p_fstype = FS_BSDFFS;
281: dpart.part->p_fsize = fs->fs_fsize;
282: dpart.part->p_frag = fs->fs_frag;
283: dpart.part->p_cpg = fs->fs_cpg;
284: }
285: blks = howmany(fs->fs_cssize, fs->fs_fsize);
286: base = space = (caddr_t)malloc((u_long)fs->fs_cssize, M_SUPERBLK,
287: M_WAITOK);
288: for (i = 0; i < blks; i += fs->fs_frag) {
289: size = fs->fs_bsize;
290: if (i + fs->fs_frag > blks)
291: size = (blks - i) * fs->fs_fsize;
292: error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size,
293: NOCRED, &bp);
294: if (error) {
295: free((caddr_t)base, M_SUPERBLK);
296: goto out;
297: }
298: bcopy((caddr_t)bp->b_un.b_addr, space, (u_int)size);
299: fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space;
300: space += size;
301: brelse(bp);
302: bp = NULL;
303: }
304: mp->mnt_data = (qaddr_t)ump;
305: mp->mnt_stat.f_fsid.val[0] = (long)dev;
306: mp->mnt_stat.f_fsid.val[1] = MOUNT_UFS;
307: mp->mnt_flag |= MNT_LOCAL;
308: ump->um_mountp = mp;
309: ump->um_dev = dev;
310: ump->um_devvp = devvp;
311: for (i = 0; i < MAXQUOTAS; i++)
312: ump->um_quotas[i] = NULLVP;
313: devvp->v_specflags |= SI_MOUNTEDON;
314:
315: /* Sanity checks for old file systems. XXX */
316: fs->fs_npsect = MAX(fs->fs_npsect, fs->fs_nsect); /* XXX */
317: fs->fs_interleave = MAX(fs->fs_interleave, 1); /* XXX */
318: if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
319: fs->fs_nrpos = 8; /* XXX */
320: return (0);
321: out:
322: if (bp)
323: brelse(bp);
324: if (needclose)
325: (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
326: if (ump) {
327: free((caddr_t)ump->um_fs, M_SUPERBLK);
328: free((caddr_t)ump, M_UFSMNT);
329: mp->mnt_data = (qaddr_t)0;
330: }
331: return (error);
332: }
333:
334: /*
335: * Make a filesystem operational.
336: * Nothing to do at the moment.
337: */
338: /* ARGSUSED */
339: ufs_start(mp, flags, p)
340: struct mount *mp;
341: int flags;
342: struct proc *p;
343: {
344:
345: return (0);
346: }
347:
348: /*
349: * unmount system call
350: */
351: ufs_unmount(mp, mntflags, p)
352: struct mount *mp;
353: int mntflags;
354: struct proc *p;
355: {
356: register struct ufsmount *ump;
357: register struct fs *fs;
358: int i, error, ronly, flags = 0;
359:
360: if (mntflags & MNT_FORCE) {
361: if (!doforce || mp == rootfs)
362: return (EINVAL);
363: flags |= FORCECLOSE;
364: }
365: mntflushbuf(mp, 0);
366: if (mntinvalbuf(mp))
367: return (EBUSY);
368: ump = VFSTOUFS(mp);
369: #ifdef QUOTA
370: if (mp->mnt_flag & MNT_QUOTA) {
371: if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags))
372: return (error);
373: for (i = 0; i < MAXQUOTAS; i++) {
374: if (ump->um_quotas[i] == NULLVP)
375: continue;
376: quotaoff(p, mp, i);
377: }
378: /*
379: * Here we fall through to vflush again to ensure
380: * that we have gotten rid of all the system vnodes.
381: */
382: }
383: #endif
384: if (error = vflush(mp, NULLVP, flags))
385: return (error);
386: fs = ump->um_fs;
387: ronly = !fs->fs_ronly;
388: ump->um_devvp->v_specflags &= ~SI_MOUNTEDON;
389: error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE,
390: NOCRED, p);
391: vrele(ump->um_devvp);
392: free((caddr_t)fs->fs_csp[0], M_SUPERBLK);
393: free((caddr_t)fs, M_SUPERBLK);
394: free((caddr_t)ump, M_UFSMNT);
395: mp->mnt_data = (qaddr_t)0;
396: mp->mnt_flag &= ~MNT_LOCAL;
397: return (error);
398: }
399:
400: /*
401: * Check to see if a filesystem is mounted on a block device.
402: */
403: mountedon(vp)
404: register struct vnode *vp;
405: {
406: register struct vnode *vq;
407:
408: if (vp->v_specflags & SI_MOUNTEDON)
409: return (EBUSY);
410: if (vp->v_flag & VALIASED) {
411: for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
412: if (vq->v_rdev != vp->v_rdev ||
413: vq->v_type != vp->v_type)
414: continue;
415: if (vq->v_specflags & SI_MOUNTEDON)
416: return (EBUSY);
417: }
418: }
419: return (0);
420: }
421:
422: /*
423: * Return root of a filesystem
424: */
425: ufs_root(mp, vpp)
426: struct mount *mp;
427: struct vnode **vpp;
428: {
429: register struct inode *ip;
430: struct inode *nip;
431: struct vnode tvp;
432: int error;
433:
434: tvp.v_mount = mp;
435: ip = VTOI(&tvp);
436: ip->i_vnode = &tvp;
437: ip->i_dev = VFSTOUFS(mp)->um_dev;
438: error = iget(ip, (ino_t)ROOTINO, &nip);
439: if (error)
440: return (error);
441: *vpp = ITOV(nip);
442: return (0);
443: }
444:
445: /*
446: * Do operations associated with quotas
447: */
448: ufs_quotactl(mp, cmds, uid, arg, p)
449: struct mount *mp;
450: int cmds;
451: uid_t uid;
452: caddr_t arg;
453: struct proc *p;
454: {
455: struct ufsmount *ump = VFSTOUFS(mp);
456: int cmd, type, error;
457:
458: #ifndef QUOTA
459: return (EOPNOTSUPP);
460: #else
461: if (uid == -1)
462: uid = p->p_cred->p_ruid;
463: cmd = cmds >> SUBCMDSHIFT;
464:
465: switch (cmd) {
466: case Q_GETQUOTA:
467: case Q_SYNC:
468: if (uid == p->p_cred->p_ruid)
469: break;
470: /* fall through */
471: default:
472: if (error = suser(p->p_ucred, &p->p_acflag))
473: return (error);
474: }
475:
476: type = cmd & SUBCMDMASK;
477: if ((u_int)type >= MAXQUOTAS)
478: return (EINVAL);
479:
480: switch (cmd) {
481:
482: case Q_QUOTAON:
483: return (quotaon(p, mp, type, arg));
484:
485: case Q_QUOTAOFF:
486: if (vfs_busy(mp))
487: return (0);
488: error = quotaoff(p, mp, type);
489: vfs_unbusy(mp);
490: return (error);
491:
492: case Q_SETQUOTA:
493: return (setquota(mp, uid, type, arg));
494:
495: case Q_SETUSE:
496: return (setuse(mp, uid, type, arg));
497:
498: case Q_GETQUOTA:
499: return (getquota(mp, uid, type, arg));
500:
501: case Q_SYNC:
502: if (vfs_busy(mp))
503: return (0);
504: error = qsync(mp);
505: vfs_unbusy(mp);
506: return (error);
507:
508: default:
509: return (EINVAL);
510: }
511: /* NOTREACHED */
512: #endif
513: }
514:
515: /*
516: * Get file system statistics.
517: */
518: ufs_statfs(mp, sbp, p)
519: struct mount *mp;
520: register struct statfs *sbp;
521: struct proc *p;
522: {
523: register struct ufsmount *ump;
524: register struct fs *fs;
525:
526: ump = VFSTOUFS(mp);
527: fs = ump->um_fs;
528: if (fs->fs_magic != FS_MAGIC)
529: panic("ufs_statfs");
530: sbp->f_type = MOUNT_UFS;
531: sbp->f_fsize = fs->fs_fsize;
532: sbp->f_bsize = fs->fs_bsize;
533: sbp->f_blocks = fs->fs_dsize;
534: sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag +
535: fs->fs_cstotal.cs_nffree;
536: sbp->f_bavail = (fs->fs_dsize * (100 - fs->fs_minfree) / 100) -
537: (fs->fs_dsize - sbp->f_bfree);
538: sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO;
539: sbp->f_ffree = fs->fs_cstotal.cs_nifree;
540: if (sbp != &mp->mnt_stat) {
541: bcopy((caddr_t)mp->mnt_stat.f_mntonname,
542: (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
543: bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
544: (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
545: }
546: return (0);
547: }
548:
549: int syncprt = 0;
550:
551: /*
552: * Go through the disk queues to initiate sandbagged IO;
553: * go through the inodes to write those that have been modified;
554: * initiate the writing of the super block if it has been modified.
555: *
556: * Note: we are always called with the filesystem marked `MPBUSY'.
557: */
558: ufs_sync(mp, waitfor)
559: struct mount *mp;
560: int waitfor;
561: {
562: register struct vnode *vp;
563: register struct inode *ip;
564: register struct ufsmount *ump = VFSTOUFS(mp);
565: register struct fs *fs;
566: int error, allerror = 0;
567:
568: if (syncprt)
569: bufstats();
570: fs = ump->um_fs;
571: /*
572: * Write back modified superblock.
573: * Consistency check that the superblock
574: * is still in the buffer cache.
575: */
576: if (fs->fs_fmod != 0) {
577: if (fs->fs_ronly != 0) { /* XXX */
578: printf("fs = %s\n", fs->fs_fsmnt);
579: panic("update: rofs mod");
580: }
581: fs->fs_fmod = 0;
582: fs->fs_time = time.tv_sec;
583: allerror = sbupdate(ump, waitfor);
584: }
585: /*
586: * Write back each (modified) inode.
587: */
588: loop:
589: for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) {
590: /*
591: * If the vnode that we are about to sync is no longer
592: * associated with this mount point, start over.
593: */
594: if (vp->v_mount != mp)
595: goto loop;
596: if (VOP_ISLOCKED(vp))
597: continue;
598: ip = VTOI(vp);
599: if ((ip->i_flag & (IMOD|IACC|IUPD|ICHG)) == 0 &&
600: vp->v_dirtyblkhd == NULL)
601: continue;
602: if (vget(vp))
603: goto loop;
604: if (vp->v_dirtyblkhd)
605: vflushbuf(vp, 0);
606: if ((ip->i_flag & (IMOD|IACC|IUPD|ICHG)) &&
607: (error = iupdat(ip, &time, &time, 0)))
608: allerror = error;
609: vput(vp);
610: }
611: /*
612: * Force stale file system control information to be flushed.
613: */
614: vflushbuf(ump->um_devvp, waitfor == MNT_WAIT ? B_SYNC : 0);
615: #ifdef QUOTA
616: qsync(mp);
617: #endif
618: return (allerror);
619: }
620:
621: /*
622: * Write a superblock and associated information back to disk.
623: */
624: sbupdate(mp, waitfor)
625: struct ufsmount *mp;
626: int waitfor;
627: {
628: register struct fs *fs = mp->um_fs;
629: register struct buf *bp;
630: int blks;
631: caddr_t space;
632: int i, size, error = 0;
633:
634: bp = getblk(mp->um_devvp, SBLOCK, (int)fs->fs_sbsize);
635: bcopy((caddr_t)fs, bp->b_un.b_addr, (u_int)fs->fs_sbsize);
636: /* Restore compatibility to old file systems. XXX */
637: if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
638: bp->b_un.b_fs->fs_nrpos = -1; /* XXX */
639: if (waitfor == MNT_WAIT)
640: error = bwrite(bp);
641: else
642: bawrite(bp);
643: blks = howmany(fs->fs_cssize, fs->fs_fsize);
644: space = (caddr_t)fs->fs_csp[0];
645: for (i = 0; i < blks; i += fs->fs_frag) {
646: size = fs->fs_bsize;
647: if (i + fs->fs_frag > blks)
648: size = (blks - i) * fs->fs_fsize;
649: bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i), size);
650: bcopy(space, bp->b_un.b_addr, (u_int)size);
651: space += size;
652: if (waitfor == MNT_WAIT)
653: error = bwrite(bp);
654: else
655: bawrite(bp);
656: }
657: return (error);
658: }
659:
660: /*
661: * Print out statistics on the current allocation of the buffer pool.
662: * Can be enabled to print out on every ``sync'' by setting "syncprt"
663: * above.
664: */
665: bufstats()
666: {
667: int s, i, j, count;
668: register struct buf *bp, *dp;
669: int counts[MAXBSIZE/CLBYTES+1];
670: static char *bname[BQUEUES] = { "LOCKED", "LRU", "AGE", "EMPTY" };
671:
672: for (bp = bfreelist, i = 0; bp < &bfreelist[BQUEUES]; bp++, i++) {
673: count = 0;
674: for (j = 0; j <= MAXBSIZE/CLBYTES; j++)
675: counts[j] = 0;
676: s = splbio();
677: for (dp = bp->av_forw; dp != bp; dp = dp->av_forw) {
678: counts[dp->b_bufsize/CLBYTES]++;
679: count++;
680: }
681: splx(s);
682: printf("%s: total-%d", bname[i], count);
683: for (j = 0; j <= MAXBSIZE/CLBYTES; j++)
684: if (counts[j] != 0)
685: printf(", %d-%d", j * CLBYTES, counts[j]);
686: printf("\n");
687: }
688: }
689:
690: /*
691: * File handle to vnode
692: *
693: * Have to be really careful about stale file handles:
694: * - check that the inode number is in range
695: * - call iget() to get the locked inode
696: * - check for an unallocated inode (i_mode == 0)
697: * - check that the generation number matches
698: */
699: ufs_fhtovp(mp, fhp, vpp)
700: register struct mount *mp;
701: struct fid *fhp;
702: struct vnode **vpp;
703: {
704: register struct ufid *ufhp;
705: register struct fs *fs;
706: register struct inode *ip;
707: struct inode *nip;
708: struct vnode tvp;
709: int error;
710:
711: ufhp = (struct ufid *)fhp;
712: fs = VFSTOUFS(mp)->um_fs;
713: if (ufhp->ufid_ino < ROOTINO ||
714: ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg) {
715: *vpp = NULLVP;
716: return (EINVAL);
717: }
718: tvp.v_mount = mp;
719: ip = VTOI(&tvp);
720: ip->i_vnode = &tvp;
721: ip->i_dev = VFSTOUFS(mp)->um_dev;
722: if (error = iget(ip, ufhp->ufid_ino, &nip)) {
723: *vpp = NULLVP;
724: return (error);
725: }
726: ip = nip;
727: if (ip->i_mode == 0) {
728: iput(ip);
729: *vpp = NULLVP;
730: return (EINVAL);
731: }
732: if (ip->i_gen != ufhp->ufid_gen) {
733: iput(ip);
734: *vpp = NULLVP;
735: return (EINVAL);
736: }
737: *vpp = ITOV(ip);
738: return (0);
739: }
740:
741: /*
742: * Vnode pointer to File handle
743: */
744: /* ARGSUSED */
745: ufs_vptofh(vp, fhp)
746: struct vnode *vp;
747: struct fid *fhp;
748: {
749: register struct inode *ip = VTOI(vp);
750: register struct ufid *ufhp;
751:
752: ufhp = (struct ufid *)fhp;
753: ufhp->ufid_len = sizeof(struct ufid);
754: ufhp->ufid_ino = ip->i_number;
755: ufhp->ufid_gen = ip->i_gen;
756: return (0);
757: }
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