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1.1 root 1: /*
2: * Written by Paul Popelka ([email protected])
3: *
4: * You can do anything you want with this software,
5: * just don't say you wrote it,
6: * and don't remove this notice.
7: *
8: * This software is provided "as is".
9: *
10: * The author supplies this software to be publicly
11: * redistributed on the understanding that the author
12: * is not responsible for the correct functioning of
13: * this software in any circumstances and is not liable
14: * for any damages caused by this software.
15: *
16: * October 1992
17: *
18: * pcfs_vnops.c,v 1.3.2.1 1993/08/05 02:37:23 cgd Exp
19: */
20:
21: #include "param.h"
22: #include "systm.h"
23: #include "namei.h"
24: #include "resourcevar.h" /* defines plimit structure in proc struct */
25: #include "kernel.h"
26: #include "file.h" /* define FWRITE ... */
27: #include "stat.h"
28: #include "buf.h"
29: #include "proc.h"
30: #include "mount.h"
31: #include "vnode.h"
32: #include "specdev.h" /* defines plimit structure in the proc struct */
33: #include "malloc.h"
34:
35: #include "dir.h" /* defines dirent structure */
36:
37: #include "bpb.h"
38: #include "direntry.h"
39: #include "denode.h"
40: #include "pcfsmount.h"
41: #include "fat.h"
42: /*
43: * Some general notes:
44: *
45: * In the ufs filesystem the inodes, superblocks, and indirect
46: * blocks are read/written using the vnode for the filesystem.
47: * Blocks that represent the contents of a file are read/written
48: * using the vnode for the file (including directories when
49: * they are read/written as files).
50: * This presents problems for the dos filesystem because data
51: * that should be in an inode (if dos had them) resides in the
52: * directory itself. Since we must update directory entries
53: * without the benefit of having the vnode for the directory
54: * we must use the vnode for the filesystem. This means that
55: * when a directory is actually read/written (via read, write,
56: * or readdir, or seek) we must use the vnode for the filesystem
57: * instead of the vnode for the directory as would happen in ufs.
58: * This is to insure we retreive the correct block from the
59: * buffer cache since the hash value is based upon the vnode
60: * address and the desired block number.
61: */
62:
63: /*
64: * Create a regular file.
65: * On entry the directory to contain the file being
66: * created is locked. We must release before we
67: * return.
68: * We must also free the pathname buffer pointed at
69: * by ndp->ni_pnbuf, always on error, or only if the
70: * SAVESTART bit in ni_nameiop is clear on success.
71: */
72: int
73: pcfs_create(ndp, vap, p)
74: struct nameidata *ndp;
75: struct vattr *vap;
76: struct proc *p;
77: {
78: struct denode ndirent;
79: struct direntry *ndirp = &ndirent.de_de;
80: struct denode *dep;
81: struct denode *pdep = VTODE(ndp->ni_dvp);
82: int error;
83: #if defined(PCFSDEBUG)
84: printf("pcfs_create(ndp %08x, vap %08x, p %08x\n", ndp, vap, p);
85: #endif /* defined(PCFSDEBUG) */
86:
87: /*
88: * Create a directory entry for the file, then call
89: * createde() to have it installed.
90: * NOTE: DOS files are always executable. We use the
91: * absence of the owner write bit to make the file readonly.
92: */
93: bzero(&ndirent, sizeof(ndirent));
94: unix2dostime(&time, (union dosdate *)&ndirp->deDate,
95: (union dostime *)&ndirp->deTime);
96: unix2dosfn((u_char *)ndp->ni_ptr, ndirp->deName, ndp->ni_namelen);
97: ndirp->deAttributes = (vap->va_mode & VWRITE) ? 0 : ATTR_READONLY;
98: ndirp->deStartCluster = 0;
99: ndirp->deFileSize = 0;
100: ndirent.de_pmp = pdep->de_pmp;
101: ndirent.de_dev = pdep->de_dev;
102: ndirent.de_devvp = pdep->de_devvp;
103: if ((error = createde(&ndirent, ndp, &dep)) == 0) {
104: ndp->ni_vp = DETOV(dep);
105: if ((ndp->ni_nameiop & SAVESTART) == 0)
106: free(ndp->ni_pnbuf, M_NAMEI);
107: } else {
108: free(ndp->ni_pnbuf, M_NAMEI);
109: }
110: deput(pdep); /* release parent dir */
111: return error;
112: }
113:
114: int
115: pcfs_mknod(ndp, vap, cred, p)
116: struct nameidata *ndp;
117: struct vattr *vap;
118: struct ucred *cred;
119: struct proc *p;
120: {
121: int error;
122:
123: switch (vap->va_type) {
124: case VDIR:
125: error = pcfs_mkdir(ndp, vap, p);
126: break;
127:
128: /*
129: * pcfs_create() sets ndp->ni_vp.
130: */
131: case VREG:
132: error = pcfs_create(ndp, vap, p);
133: break;
134:
135: default:
136: error = EINVAL;
137: break;
138: }
139: return error;
140: }
141:
142: int
143: pcfs_open(vp, mode, cred, p)
144: struct vnode *vp;
145: int mode;
146: struct ucred *cred;
147: struct proc *p;
148: {
149: return 0;
150: }
151:
152: int
153: pcfs_close(vp, fflag, cred, p)
154: struct vnode *vp;
155: int fflag;
156: struct ucred *cred;
157: struct proc *p;
158: {
159: struct denode *dep = VTODE(vp);
160:
161: if (vp->v_usecount > 1 && !(dep->de_flag & DELOCKED))
162: DETIMES(dep, &time);
163: return 0;
164: }
165:
166: int
167: pcfs_access(vp, mode, cred, p)
168: struct vnode *vp;
169: int mode;
170: struct ucred *cred;
171: struct proc *p;
172: {
173: int dosmode;
174: struct denode *dep = VTODE(vp);
175:
176: /*
177: * Root gets to do anything. Even execute a file
178: * without the x-bit on? But, for dos filesystems
179: * every file is executable. I may regret this.
180: */
181: if (cred->cr_uid == 0)
182: return 0;
183:
184: /*
185: * mode is filled with a combination of VREAD, VWRITE,
186: * and/or VEXEC bits turned on. In an octal number these
187: * are the Y in 0Y00.
188: *
189: * Since the dos filesystem doesn't have the concept of
190: * file ownership we just give everybody read and execute
191: * access and write access if the readonly bit is off.
192: */
193: dosmode = VEXEC | VREAD |
194: ((dep->de_Attributes & ATTR_READONLY) ? 0 : VWRITE);
195: return ((dosmode & mode) != 0) ? 0 : EACCES;
196: }
197:
198: int
199: pcfs_getattr(vp, vap, cred, p)
200: struct vnode *vp;
201: struct vattr *vap;
202: struct ucred *cred;
203: struct proc *p;
204: {
205: u_int cn;
206: struct denode *dep = VTODE(vp);
207:
208: DETIMES(dep, &time);
209: vap->va_fsid = dep->de_dev;
210: /* The following computation of the fileid must be the
211: * same as that used in pcfs_readdir() to compute d_fileno.
212: * If not, pwd doesn't work. */
213: if (dep->de_Attributes & ATTR_DIRECTORY) {
214: if ((cn = dep->de_StartCluster) == PCFSROOT)
215: cn = 1;
216: } else {
217: if ((cn = dep->de_dirclust) == PCFSROOT)
218: cn = 1;
219: cn = (cn << 16) | (dep->de_diroffset & 0xffff);
220: }
221: vap->va_fileid = cn;
222: vap->va_mode = (dep->de_Attributes & ATTR_READONLY) ? 0555 : 0777;
223: if (dep->de_Attributes & ATTR_DIRECTORY)
224: vap->va_mode |= S_IFDIR;
225: vap->va_nlink = 1;
226: vap->va_gid = 0;
227: vap->va_uid = 0;
228: vap->va_rdev = 0;
229: vap->va_size = dep->de_FileSize;
230: vap->va_size_rsv = 0;
231: dos2unixtime((union dosdate *)&dep->de_Date,
232: (union dostime *)&dep->de_Time, &vap->va_atime);
233: vap->va_atime.tv_usec = 0;
234: vap->va_mtime.tv_sec = vap->va_atime.tv_sec;
235: vap->va_mtime.tv_usec = 0;
236: vap->va_ctime.tv_sec = vap->va_atime.tv_sec;
237: vap->va_ctime.tv_usec = 0;
238: vap->va_flags = dep->de_flag;
239: vap->va_gen = 0;
240: vap->va_blocksize = dep->de_pmp->pm_bpcluster;
241: vap->va_bytes = (dep->de_FileSize + dep->de_pmp->pm_crbomask) &
242: ~(dep->de_pmp->pm_crbomask);
243: vap->va_bytes_rsv = 0;
244: vap->va_type = vp->v_type;
245: return 0;
246: }
247:
248: int
249: pcfs_setattr(vp, vap, cred, p)
250: struct vnode *vp;
251: struct vattr *vap;
252: struct ucred *cred;
253: struct proc *p;
254: {
255: int error = 0;
256: struct denode *dep = VTODE(vp);
257:
258: #if defined(PCFSDEBUG)
259: printf("pcfs_setattr(): vp %08x, vap %08x, cred %08x, p %08x\n",
260: vp, vap, cred, p);
261: #endif /* defined(PCFSDEBUG) */
262: if ((vap->va_type != VNON) ||
263: (vap->va_nlink != VNOVAL) ||
264: (vap->va_fsid != VNOVAL) ||
265: (vap->va_fileid != VNOVAL) ||
266: (vap->va_blocksize != VNOVAL) ||
267: (vap->va_rdev != VNOVAL) ||
268: (vap->va_bytes != VNOVAL) ||
269: (vap->va_gen != VNOVAL) ||
270: #if 0
271: (vap->va_uid != (u_short)VNOVAL) ||
272: (vap->va_gid != (u_short)VNOVAL) ||
273: (vap->va_atime.tv_sec != VNOVAL) ||
274: #endif
275: 0) {
276: #if defined(PCFSDEBUG)
277: printf("pcfs_setattr(): returning EINVAL\n");
278: printf(" va_type %d, va_nlink %x, va_fsid %x, va_fileid %x\n",
279: vap->va_type, vap->va_nlink, vap->va_fsid, vap->va_fileid);
280: printf(" va_blocksize %x, va_rdev %x, va_bytes %x, va_gen %x\n",
281: vap->va_blocksize, vap->va_rdev, vap->va_bytes, vap->va_gen);
282: printf(" va_uid %x, va_gid %x, va_atime.tv_sec %x\n",
283: vap->va_uid, vap->va_gid, vap->va_atime.tv_sec);
284: #endif /* defined(PCFSDEBUG) */
285: return EINVAL;
286: }
287:
288: if (vap->va_size != VNOVAL) {
289: if (vp->v_type == VDIR)
290: return EISDIR;
291: if (error = detrunc(dep, vap->va_size, 0))
292: return error;
293: }
294: if (vap->va_mtime.tv_sec != VNOVAL) {
295: dep->de_flag |= DEUPD;
296: if (error = deupdat(dep, &vap->va_mtime, 1))
297: return error;
298: }
299:
300: /*
301: * DOS files only have the ability to have thier
302: * writability attribute set, so we use the owner
303: * write bit to set the readonly attribute.
304: */
305: if (vap->va_mode != (u_short)VNOVAL) {
306: /* We ignore the read and execute bits */
307: if (vap->va_mode & VWRITE)
308: dep->de_Attributes &= ~ATTR_READONLY;
309: else
310: dep->de_Attributes |= ATTR_READONLY;
311: dep->de_flag |= DEUPD;
312: }
313:
314: if (vap->va_flags != VNOVAL) {
315: if (error = suser(cred, &p->p_acflag))
316: return error;
317: if (cred->cr_uid == 0)
318: dep->de_flag = vap->va_flags;
319: else {
320: dep->de_flag &= 0xffff0000;
321: dep->de_flag |= (vap->va_flags & 0xffff);
322: }
323: dep->de_flag |= DEUPD;
324: }
325: return error;
326: }
327:
328:
329: int
330: pcfs_read(vp, uio, ioflag, cred)
331: struct vnode *vp;
332: struct uio *uio;
333: int ioflag;
334: struct ucred *cred;
335: {
336: int error = 0;
337: int diff;
338: int isadir;
339: long n;
340: long on;
341: daddr_t bn;
342: daddr_t lbn;
343: daddr_t rablock;
344: struct buf *bp;
345: struct denode *dep = VTODE(vp);
346: struct pcfsmount *pmp = dep->de_pmp;
347:
348: /*
349: * If they didn't ask for any data, then we
350: * are done.
351: */
352: if (uio->uio_resid == 0)
353: return 0;
354: if (uio->uio_offset < 0)
355: return EINVAL;
356:
357: isadir = dep->de_Attributes & ATTR_DIRECTORY;
358: do {
359: lbn = uio->uio_offset >> pmp->pm_cnshift;
360: on = uio->uio_offset & pmp->pm_crbomask;
361: n = MIN((u_long)(pmp->pm_bpcluster - on), uio->uio_resid);
362: diff = dep->de_FileSize - uio->uio_offset;
363: if (diff <= 0)
364: return 0;
365: /* convert cluster # to block # if a directory */
366: if (isadir) {
367: error = pcbmap(dep, lbn, &lbn, 0);
368: if (error)
369: return error;
370: }
371: if (diff < n)
372: n = diff;
373: /*
374: * If we are operating on a directory file then be
375: * sure to do i/o with the vnode for the filesystem
376: * instead of the vnode for the directory.
377: */
378: if (isadir) {
379: error = bread(pmp->pm_devvp, lbn, pmp->pm_bpcluster,
380: NOCRED, &bp);
381: } else {
382: rablock = lbn + 1;
383: if (vp->v_lastr + 1 == lbn &&
384: rablock * pmp->pm_bpcluster < dep->de_FileSize) {
385: error = breada(vp, lbn, pmp->pm_bpcluster,
386: rablock, pmp->pm_bpcluster, NOCRED, &bp);
387: } else {
388: error = bread(vp, lbn, pmp->pm_bpcluster, NOCRED,
389: &bp);
390: }
391: vp->v_lastr = lbn;
392: }
393: if (error) {
394: brelse(bp);
395: return error;
396: }
397: n = MIN(n, pmp->pm_bpcluster - bp->b_resid);
398: error = uiomove(bp->b_un.b_addr + on, (int)n, uio);
399: /*
400: * If we have read everything from this block or
401: * have read to end of file then we are done with
402: * this block. Mark it to say the buffer can be reused if
403: * need be.
404: */
405: #if 0
406: if (n + on == pmp->pm_bpcluster ||
407: uio->uio_offset == dep->de_FileSize)
408: bp->b_flags |= B_AGE;
409: #endif
410: brelse(bp);
411: } while (error == 0 && uio->uio_resid > 0 && n != 0);
412: return error;
413: }
414:
415: /*
416: * Write data to a file or directory.
417: */
418: int
419: pcfs_write(vp, uio, ioflag, cred)
420: struct vnode *vp;
421: struct uio *uio;
422: int ioflag;
423: struct ucred *cred;
424: {
425: int n;
426: int croffset;
427: int resid;
428: int osize;
429: int error;
430: u_long cluster;
431: u_long nextcluster;
432: u_long lastcluster;
433: daddr_t bn;
434: struct buf *bp;
435: struct proc *p = uio->uio_procp;
436: struct denode *dep = VTODE(vp);
437: struct pcfsmount *pmp = dep->de_pmp;
438:
439: #if defined(PCFSDEBUG)
440: printf("pcfs_write(vp %08x, uio %08x, ioflag %08x, cred %08x\n",
441: vp, uio, ioflag, cred);
442: printf("pcfs_write(): diroff %d, dirclust %d, startcluster %d\n",
443: dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster);
444: #endif /* defined(PCFSDEBUG) */
445:
446: switch (vp->v_type) {
447: case VREG:
448: if (ioflag & IO_APPEND)
449: uio->uio_offset = dep->de_FileSize;
450: break;
451:
452: case VDIR:
453: /* In pcfs, directory updates don't use pcfs_write */
454: panic("pcfs_write(): directory update");
455: break;
456:
457: default:
458: panic("pcfs_write(): bad file type");
459: break;
460: }
461:
462: if (uio->uio_offset < 0)
463: return EINVAL;
464: if (uio->uio_resid == 0)
465: return 0;
466:
467: /*
468: * If they've exceeded their filesize limit, tell them about it.
469: */
470: if (vp->v_type == VREG && p &&
471: ((uio->uio_offset + uio->uio_resid) >
472: p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
473: psignal(p, SIGXFSZ);
474: return EFBIG;
475: }
476:
477: /*
478: * If the offset we are starting the write at is beyond the
479: * end of the file, then they've done a seek. Unix filesystems
480: * allow files with holes in them, DOS doesn't so we must
481: * fill the hole with zeroed blocks.
482: */
483: if (uio->uio_offset > dep->de_FileSize) {
484: error = pcfsextend(vp, uio->uio_offset);
485: if (error)
486: return error;
487: }
488:
489: /*
490: * Remember some values in case the write fails.
491: */
492: resid = uio->uio_resid;
493: osize = dep->de_FileSize;
494:
495: do {
496: bn = uio->uio_offset >> pmp->pm_cnshift;
497: croffset = uio->uio_offset & pmp->pm_crbomask;
498: n = MIN(uio->uio_resid, pmp->pm_bpcluster-croffset);
499: /*
500: * If we are appending to the file and we are on a
501: * cluster boundary, then allocate a new cluster
502: * and chain it onto the file.
503: */
504: if (uio->uio_offset == dep->de_FileSize &&
505: (uio->uio_offset & pmp->pm_crbomask) == 0) {
506: if (error = extendfile(dep, &bp, 0))
507: break;
508: } else {
509: /*
510: * The block we need to write into exists,
511: * so just read it in.
512: */
513: if (n == pmp->pm_bpcluster)
514: /* We will overwrite the whole block, so
515: * dont read it*/
516: bp = getblk(vp, bn, pmp->pm_bpcluster);
517: else {
518: error = bread(vp, bn, pmp->pm_bpcluster, cred, &bp);
519: if (error) {
520: brelse(bp);
521: return error;
522: }
523: }
524: }
525: if (uio->uio_offset+n > dep->de_FileSize) {
526: dep->de_FileSize = uio->uio_offset + n;
527: vnode_pager_setsize(vp, dep->de_FileSize);
528: }
529: (void) vnode_pager_uncache(vp);
530:
531: /*
532: * Copy the data from user space into the buf header.
533: */
534: error = uiomove(bp->b_un.b_addr+croffset, n, uio);
535:
536: /*
537: * If they want this synchronous then write it and wait
538: * for it. Otherwise, if on a cluster boundary write it
539: * asynchronously so we can move on to the next block
540: * without delay. Otherwise do a delayed write because
541: * we may want to write somemore into the block later.
542: */
543: if (ioflag & IO_SYNC)
544: (void) bwrite(bp);
545: else
546: if (n + croffset == pmp->pm_bpcluster) {
547: bp->b_flags |= B_AGE;
548: bawrite(bp);
549: } else
550: bdwrite(bp);
551: dep->de_flag |= DEUPD;
552: } while (error == 0 && uio->uio_resid > 0);
553:
554: /*
555: * If the write failed and they want us to, truncate
556: * the file back to the size it was before the write
557: * was attempted.
558: */
559: if (error && (ioflag & IO_UNIT)) {
560: detrunc(dep, osize, ioflag & IO_SYNC);
561: uio->uio_offset -= resid - uio->uio_resid;
562: uio->uio_resid = resid;
563: }
564: if (!error && (ioflag & IO_UNIT))
565: error = deupdat(dep, &time, 1);
566: return error;
567: }
568:
569: int
570: pcfs_ioctl(vp, com, data, fflag, cred, p)
571: struct vnode *vp;
572: int com;
573: caddr_t data;
574: struct ucred *cred;
575: struct proc *p;
576: {
577: return ENOTTY;
578: }
579:
580: int
581: pcfs_select(vp, which, fflags, cred, p)
582: struct vnode *vp;
583: int which;
584: int fflags;
585: struct ucred *cred;
586: struct proc *p;
587: {
588: return 1; /* DOS filesystems never block? */
589: }
590:
591: int
592: pcfs_mmap(vp, fflags, cred, p)
593: struct vnode *vp;
594: int fflags;
595: struct ucred *cred;
596: struct proc *p;
597: {
598: return EINVAL;
599: }
600:
601: /*
602: * Flush the blocks of a file to disk.
603: *
604: * This function is worthless for vnodes that represent
605: * directories.
606: * Maybe we could just do a sync if they try an fsync
607: * on a directory file.
608: */
609: int
610: pcfs_fsync(vp, fflags, cred, waitfor, p)
611: struct vnode *vp;
612: int fflags;
613: struct ucred *cred;
614: int waitfor;
615: struct proc *p;
616: {
617: struct denode *dep = VTODE(vp);
618:
619: if (fflags & FWRITE)
620: dep->de_flag |= DEUPD;
621:
622: vflushbuf(vp, waitfor == MNT_WAIT ? B_SYNC : 0);
623: return deupdat(dep, &time, waitfor == MNT_WAIT);
624: }
625:
626: /*
627: * Since the dos filesystem does not allow files with
628: * holes in them we must fill the file with zeroed
629: * blocks when a write past the end of file happens.
630: */
631: int
632: pcfsextend(vp, newoff)
633: struct vnode *vp;
634: off_t newoff;
635: {
636: int error = 0;
637: off_t foff;
638: struct buf *bp;
639: struct denode *dep = VTODE(vp);
640: struct pcfsmount *pmp = dep->de_pmp;
641:
642: #ifdef DIAGNOSTIC
643: if (dep->de_Attributes & ATTR_DIRECTORY)
644: /* should not happen */
645: return EISDIR;
646: #endif
647:
648: /*
649: * Compute the offset of the first byte after the
650: * last block in the file.
651: * If writing beyond the end of file then fill the
652: * file with zeroed blocks up to the seek address.
653: */
654: foff = (dep->de_FileSize + (pmp->pm_bpcluster-1)) & ~pmp->pm_crbomask;
655: if (newoff <= foff)
656: return 0;
657:
658: /*
659: * Allocate and chain together as many clusters as
660: * are needed to get to newoff.
661: */
662: while (foff < newoff) {
663: if (error = extendfile(dep, &bp, 0))
664: return error;
665: bdwrite(bp);
666: foff += pmp->pm_bpcluster;
667: dep->de_FileSize += pmp->pm_bpcluster;
668: }
669: dep->de_FileSize = newoff;
670: dep->de_flag |= DEUPD;
671: return deupdat(dep, &time);
672: }
673:
674: /*
675: * Seek on a file
676: *
677: * Nothing to do, so just return.
678: */
679: int
680: pcfs_seek(vp, oldoff, newoff, cred)
681: struct vnode *vp;
682: off_t oldoff;
683: off_t newoff;
684: struct ucred *cred;
685: {
686: return 0;
687: }
688:
689: int
690: pcfs_remove(ndp, p)
691: struct nameidata *ndp;
692: struct proc *p;
693: {
694: int error;
695: struct denode *dep = VTODE(ndp->ni_vp);
696: struct denode *ddep = VTODE(ndp->ni_dvp);
697:
698: error = removede(ndp);
699: #if defined(PCFSDEBUG)
700: printf("pcfs_remove(), dep %08x, v_usecount %d\n", dep, ndp->ni_vp->v_usecount);
701: #endif /* defined(PCFSDEBUG) */
702: if (ddep == dep)
703: vrele(DETOV(dep));
704: else
705: deput(dep); /* causes pcfs_inactive() to be called via vrele() */
706: deput(ddep);
707: return error;
708: }
709:
710: /*
711: * DOS filesystems don't know what links are.
712: */
713: int
714: pcfs_link(vp, ndp, p)
715: struct vnode *vp;
716: struct nameidata *ndp;
717: struct proc *p;
718: {
719: return EINVAL;
720: }
721:
722: /*
723: * Renames on files require moving the denode to
724: * a new hash queue since the denode's location is
725: * used to compute which hash queue to put the file in.
726: * Unless it is a rename in place. For example "mv a b".
727: *
728: * What follows is the basic algorithm:
729: *
730: * if (file move) {
731: * if (dest file exists) {
732: * remove dest file
733: * }
734: * if (dest and src in same directory) {
735: * rewrite name in existing directory slot
736: * } else {
737: * write new entry in dest directory
738: * update offset and dirclust in denode
739: * move denode to new hash chain
740: * clear old directory entry
741: * }
742: * } else { directory move
743: * if (dest directory exists) {
744: * if (dest is not empty) {
745: * return ENOTEMPTY
746: * }
747: * remove dest directory
748: * }
749: * if (dest and src in same directory) {
750: * rewrite name in existing entry
751: * } else {
752: * be sure dest is not a child of src directory
753: * write entry in dest directory
754: * update "." and ".." in moved directory
755: * update offset and dirclust in denode
756: * move denode to new hash chain
757: * clear old directory entry for moved directory
758: * }
759: * }
760: *
761: * On entry:
762: * source's parent directory is unlocked
763: * source file or directory is unlocked
764: * destination's parent directory is locked
765: * destination file or directory is locked if it exists
766: *
767: * On exit:
768: * all denodes should be released
769: * Notes:
770: * I'm not sure how the memory containing the pathnames
771: * pointed at by the nameidata structures is freed, there
772: * may be some memory bleeding for each rename done.
773: */
774: int
775: pcfs_rename(fndp, tndp, p)
776: struct nameidata *fndp;
777: struct nameidata *tndp;
778: struct proc *p;
779: {
780: u_char toname[11];
781: int error;
782: int newparent = 0;
783: int sourceisadirectory = 0;
784: u_long to_dirclust;
785: u_long to_diroffset;
786: u_long cn;
787: daddr_t bn;
788: struct denode *fddep; /* from file's parent directory */
789: struct denode *fdep; /* from file or directory */
790: struct denode *tddep; /* to file's parent directory */
791: struct denode *tdep; /* to file or directory */
792: struct pcfsmount *pmp;
793: struct direntry *dotdotp;
794: struct direntry *ep;
795: struct buf *bp;
796:
797: #if defined(PCFSDEBUG)
798: printf("pcfs_rename(fndp %08x, tndp %08x, p %08x\n", fndp, tndp, p);
799: #endif /* defined(PCFSDEBUG) */
800: fddep = VTODE(fndp->ni_dvp);
801: fdep = VTODE(fndp->ni_vp);
802: tddep = VTODE(tndp->ni_dvp);
803: tdep = tndp->ni_vp ? VTODE(tndp->ni_vp) : NULL;
804: pmp = fddep->de_pmp;
805:
806: /*
807: * Convert the filename in tdnp into a dos filename.
808: * We copy this into the denode and directory entry
809: * for the destination file/directory.
810: */
811: unix2dosfn((u_char *)tndp->ni_ptr, toname, tndp->ni_namelen);
812:
813: /*
814: * At this point this is the lock state of the denodes:
815: * fddep referenced
816: * fdep referenced
817: * tddep locked
818: * tdep locked if it exists
819: */
820:
821: /*
822: * Be sure we are not renaming ".", "..", or an alias of ".".
823: * This leads to a crippled directory tree. It's pretty tough
824: * to do a "ls" or "pwd" with the "." directory entry missing,
825: * and "cd .." doesn't work if the ".." entry is missing.
826: */
827: if (fdep->de_Attributes & ATTR_DIRECTORY) {
828: if ((fndp->ni_namelen == 1 && fndp->ni_ptr[0] == '.') ||
829: fddep == fdep || /* won't happen ? */
830: fndp->ni_isdotdot) {
831: VOP_ABORTOP(tndp);
832: vput(tndp->ni_dvp);
833: if (tndp->ni_vp)
834: vput(tndp->ni_vp);
835: VOP_ABORTOP(fndp);
836: vrele(fndp->ni_dvp);
837: vrele(fndp->ni_vp);
838: return EINVAL;
839: }
840: sourceisadirectory = 1;
841: }
842:
843: /*
844: * If we are renaming a directory, and the directory
845: * is being moved to another directory, then we must
846: * be sure the destination directory is not in the
847: * subtree of the source directory. This could orphan
848: * everything under the source directory.
849: * doscheckpath() unlocks the destination's parent
850: * directory so we must look it up again to relock it.
851: */
852: if (fddep->de_StartCluster != tddep->de_StartCluster)
853: newparent = 1;
854: if (sourceisadirectory && newparent) {
855: if (tdep) {
856: deput(tdep);
857: tdep = NULL;
858: }
859: /* doscheckpath() deput()'s tddep */
860: error = doscheckpath(fdep, tddep, tndp->ni_cred);
861: tddep = NULL;
862: if (error)
863: goto bad;
864: if ((tndp->ni_nameiop & SAVESTART) == 0)
865: panic("pcfs_rename(): lost to startdir");
866: if (error = lookup(tndp, p))
867: goto bad;
868: tddep = VTODE(tndp->ni_dvp);
869: tdep = tndp->ni_vp ? VTODE(tndp->ni_vp) : NULL;
870: }
871:
872: /*
873: * If the destination exists, then be sure its type (file or dir)
874: * matches that of the source. And, if it is a directory make
875: * sure it is empty. Then delete the destination.
876: */
877: if (tdep) {
878: if (tdep->de_Attributes & ATTR_DIRECTORY) {
879: if (!sourceisadirectory) {
880: error = ENOTDIR;
881: goto bad;
882: }
883: if (!dosdirempty(tdep)) {
884: error = ENOTEMPTY;
885: goto bad;
886: }
887: } else { /* destination is file */
888: if (sourceisadirectory) {
889: error = EISDIR;
890: goto bad;
891: }
892: }
893: to_dirclust = tdep->de_dirclust;
894: to_diroffset = tdep->de_diroffset;
895: if (error = removede(tndp))
896: goto bad;
897: deput(tdep);
898: tdep = NULL;
899:
900: /*
901: * Remember where the slot was for createde().
902: */
903: tndp->ni_pcfs.pcfs_count = 1;
904: tndp->ni_pcfs.pcfs_cluster = to_dirclust;
905: tndp->ni_pcfs.pcfs_offset = to_diroffset;
906: }
907:
908: /*
909: * If the source and destination are in the same
910: * directory then just read in the directory entry,
911: * change the name in the directory entry and
912: * write it back to disk.
913: */
914: if (newparent == 0) {
915: /* tddep and fddep point to the same denode here */
916: DELOCK(fdep); /* tddep is already locked */
917: if (error = readde(fdep, &bp, &ep)) {
918: DEUNLOCK(fdep);
919: goto bad;
920: }
921: bcopy(toname, ep->deName, 11);
922: if (error = bwrite(bp)) {
923: DEUNLOCK(fdep);
924: goto bad;
925: }
926: bcopy(toname, fdep->de_Name, 11); /* update denode */
927: /*
928: * fdep locked
929: * fddep and tddep point to the same denode which is locked
930: * tdep is unlocked and unreferenced
931: */
932: } else {
933: u_long dirsize;
934: /*
935: * If the source and destination are in different
936: * directories, then mark the entry in the source
937: * directory as deleted and write a new entry in the
938: * destination directory. Then move the denode to
939: * the correct hash chain for its new location in
940: * the filesystem. And, if we moved a directory,
941: * then update its .. entry to point to the new
942: * parent directory.
943: * If we moved a directory will also insure that
944: * the directory entry on disk has a filesize of
945: * zero.
946: */
947: DELOCK(fdep);
948: bcopy(toname, fdep->de_Name, 11); /* update denode */
949: if (fdep->de_Attributes & ATTR_DIRECTORY) {
950: dirsize = fdep->de_FileSize;
951: fdep->de_FileSize = 0;
952: }
953: error = createde(fdep, tndp, (struct denode **)0);
954: if (fdep->de_Attributes & ATTR_DIRECTORY) {
955: fdep->de_FileSize = dirsize;
956: }
957: if (error) {
958: /* should put back filename */
959: DEUNLOCK(fdep);
960: goto bad;
961: }
962: DELOCK(fddep);
963: error = markdeleted (pmp,
964: fndp->ni_pcfs.pcfs_cluster,
965: fndp->ni_pcfs.pcfs_offset);
966: if (error) {
967: DEUNLOCK(fdep);
968: DEUNLOCK(fddep);
969: goto bad;
970: }
971: if (!(fdep->de_Attributes & ATTR_DIRECTORY)) {
972: fdep->de_dirclust = tndp->ni_pcfs.pcfs_cluster;
973: fdep->de_diroffset = tndp->ni_pcfs.pcfs_offset;
974: reinsert(fdep);
975: }
976: DEUNLOCK(fddep);
977: }
978: /* fdep is still locked here */
979:
980: /*
981: * If we moved a directory to a new parent directory,
982: * then we must fixup the ".." entry in the moved
983: * directory.
984: */
985: if (sourceisadirectory && newparent) {
986: cn = fdep->de_StartCluster;
987: if (cn == PCFSROOT)
988: /* this should never happen */
989: panic("pcfs_rename(): updating .. in root directory?\n");
990: error = readep(pmp, cn, 1, &bp, &dotdotp);
991: if (error) {
992: /* should really panic here, fs is corrupt */
993: DEUNLOCK(fdep);
994: goto bad;
995: }
996: dotdotp->deStartCluster = tddep->de_StartCluster;
997: error = bwrite(bp);
998: DEUNLOCK(fdep);
999: if (error)
1000: /* should really panic here, fs is corrupt */
1001: goto bad;
1002: }
1003: else
1004: DEUNLOCK(fdep);
1005: bad:;
1006: vrele(DETOV(fdep));
1007: vrele(DETOV(fddep));
1008: if (tdep)
1009: vput(DETOV(tdep));
1010: if (tddep)
1011: vput(DETOV(tddep));
1012: return error;
1013: }
1014:
1015: struct {
1016: struct direntry dot;
1017: struct direntry dotdot;
1018: } dosdirtemplate = {
1019: ". ", " ", /* the . entry */
1020: ATTR_DIRECTORY, /* file attribute */
1021: 0,0,0,0,0,0,0,0,0,0, /* resevered */
1022: 1234, 1234, /* time and date */
1023: 0, /* startcluster */
1024: 0, /* filesize */
1025: ".. ", " ", /* the .. entry */
1026: ATTR_DIRECTORY, /* file attribute */
1027: 0,0,0,0,0,0,0,0,0,0, /* resevered */
1028: 1234, 1234, /* time and date */
1029: 0, /* startcluster */
1030: 0, /* filesize */
1031: };
1032:
1033: int
1034: pcfs_mkdir(ndp, vap, p)
1035: struct nameidata *ndp;
1036: struct vattr *vap;
1037: struct proc *p;
1038: {
1039: int bn;
1040: int error;
1041: u_long newcluster;
1042: struct denode *pdep;
1043: struct denode *ndep;
1044: struct vnode *pvp;
1045: struct direntry *denp;
1046: struct denode ndirent;
1047: struct pcfsmount *pmp;
1048: struct buf *bp;
1049:
1050: pvp = ndp->ni_dvp;
1051: pdep = VTODE(pvp);
1052:
1053: /*
1054: * If this is the root directory and there is no space left
1055: * we can't do anything. This is because the root directory
1056: * can not change size.
1057: */
1058: if (pdep->de_StartCluster == PCFSROOT && ndp->ni_pcfs.pcfs_count == 0) {
1059: free(ndp->ni_pnbuf, M_NAMEI);
1060: deput(pdep);
1061: return ENOSPC;
1062: }
1063:
1064: pmp = pdep->de_pmp;
1065:
1066: /*
1067: * Allocate a cluster to hold the about to be created directory.
1068: */
1069: if (error = clusteralloc(pmp, &newcluster, CLUST_EOFE)) {
1070: free(ndp->ni_pnbuf, M_NAMEI);
1071: deput(pdep);
1072: return error;
1073: }
1074:
1075: /*
1076: * Now fill the cluster with the "." and ".." entries.
1077: * And write the cluster to disk. This way it is there
1078: * for the parent directory to be pointing at if there
1079: * were a crash.
1080: */
1081: bn = cntobn(pmp, newcluster);
1082: bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster); /* always succeeds */
1083: clrbuf(bp);
1084: bcopy(&dosdirtemplate, bp->b_un.b_addr, sizeof dosdirtemplate);
1085: denp = (struct direntry *)bp->b_un.b_addr;
1086: denp->deStartCluster = newcluster;
1087: unix2dostime(&time, (union dosdate *)&denp->deDate,
1088: (union dostime *)&denp->deTime);
1089: denp++;
1090: denp->deStartCluster = pdep->de_StartCluster;
1091: unix2dostime(&time, (union dosdate *)&denp->deDate,
1092: (union dostime *)&denp->deTime);
1093: if (error = bwrite(bp)) {
1094: clusterfree(pmp, newcluster, NULL);
1095: free(ndp->ni_pnbuf, M_NAMEI);
1096: deput(pdep);
1097: return error;
1098: }
1099:
1100: /*
1101: * Now build up a directory entry pointing to the newly
1102: * allocated cluster. This will be written to an empty
1103: * slot in the parent directory.
1104: */
1105: ndep = &ndirent;
1106: bzero(ndep, sizeof(*ndep));
1107: unix2dosfn((u_char *)ndp->ni_ptr, ndep->de_Name, ndp->ni_namelen);
1108: unix2dostime(&time, (union dosdate *)&ndep->de_Date,
1109: (union dostime *)&ndep->de_Time);
1110: ndep->de_StartCluster = newcluster;
1111: ndep->de_Attributes = ATTR_DIRECTORY;
1112: ndep->de_pmp = pmp; /* createde() needs this */
1113:
1114: error = createde(ndep, ndp, &ndep);
1115: if (error) {
1116: clusterfree(pmp, newcluster, NULL);
1117: } else {
1118: ndp->ni_vp = DETOV(ndep);
1119: }
1120: free(ndp->ni_pnbuf, M_NAMEI);
1121: #if defined(PCFSDEBUG)
1122: printf("pcfs_mkdir(): deput(%08x), vnode %08x\n", pdep, DETOV(pdep));
1123: #endif /* defined(PCFSDEBUG) */
1124: deput(pdep);
1125: return error;
1126: }
1127:
1128: int
1129: pcfs_rmdir(ndp, p)
1130: struct nameidata *ndp;
1131: struct proc *p;
1132: {
1133: struct denode *ddep;
1134: struct denode *dep;
1135: int error = 0;
1136:
1137: ddep = VTODE(ndp->ni_dvp); /* parent dir of dir to delete */
1138: dep = VTODE(ndp->ni_vp); /* directory to delete */
1139:
1140: /*
1141: * Don't let "rmdir ." go thru.
1142: */
1143: if (ddep == dep) {
1144: vrele(DETOV(dep));
1145: deput(dep);
1146: return EINVAL;
1147: }
1148:
1149: /*
1150: * Be sure the directory being deleted is empty.
1151: */
1152: if (dosdirempty(dep) == 0) {
1153: error = ENOTEMPTY;
1154: goto out;
1155: }
1156:
1157: /*
1158: * Delete the entry from the directory. For dos filesystems
1159: * this gets rid of the directory entry on disk, the in memory
1160: * copy still exists but the de_refcnt is <= 0. This prevents
1161: * it from being found by deget(). When the deput() on dep is
1162: * done we give up access and eventually pcfs_reclaim() will
1163: * be called which will remove it from the denode cache.
1164: */
1165: if (error = removede(ndp))
1166: goto out;
1167:
1168: /*
1169: * This is where we decrement the link count in the parent
1170: * directory. Since dos filesystems don't do this we just
1171: * purge the name cache and let go of the parent directory
1172: * denode.
1173: */
1174: cache_purge(DETOV(ddep));
1175: deput(ddep);
1176: ndp->ni_dvp = NULL; /* getting rid of parent dir pointer? */
1177:
1178: /*
1179: * Truncate the directory that is being deleted.
1180: */
1181: error = detrunc(dep, (u_long)0, IO_SYNC);
1182: cache_purge(DETOV(dep));
1183:
1184: out:;
1185: if (ndp->ni_dvp)
1186: deput(ddep);
1187: deput(dep);
1188: return error;
1189: }
1190:
1191: /*
1192: * DOS filesystems don't know what symlinks are.
1193: */
1194: int
1195: pcfs_symlink(ndp, vap, target, p)
1196: struct nameidata *ndp;
1197: struct vattr *vap;
1198: char *target;
1199: struct proc *p;
1200: {
1201: return EINVAL;
1202: }
1203:
1204: /*
1205: * Dummy dirents to simulate the "." and ".." entries
1206: * of the root directory in a dos filesystem. Dos doesn't
1207: * provide these.
1208: * Note that each entry must be the same size as a dos
1209: * directory entry (32 bytes).
1210: */
1211: struct dos_dirent {
1212: u_long d_fileno;
1213: u_short d_reclen;
1214: u_short d_namlen;
1215: u_char d_name[24];
1216: } rootdots[2] = {
1217: {
1218: 1, /* d_fileno */
1219: sizeof(struct direntry), /* d_reclen */
1220: 1, /* d_namlen */
1221: "." /* d_name */
1222: },
1223: {
1224: 1, /* d_fileno */
1225: sizeof(struct direntry), /* d_reclen */
1226: 2, /* d_namlen */
1227: ".." /* d_name */
1228: }
1229: };
1230:
1231: int
1232: pcfs_readdir(vp, uio, cred, eofflagp)
1233: struct vnode *vp;
1234: struct uio *uio;
1235: struct ucred *cred;
1236: int *eofflagp;
1237: {
1238: int error = 0;
1239: int diff;
1240: char pushout;
1241: long n;
1242: long on;
1243: long lost;
1244: long count;
1245: u_long cn;
1246: u_long fileno;
1247: long bias = 0;
1248: daddr_t bn;
1249: daddr_t lbn;
1250: struct buf *bp;
1251: struct denode *dep = VTODE(vp);
1252: struct pcfsmount *pmp = dep->de_pmp;
1253: struct direntry *dentp;
1254: struct dirent *prev;
1255: struct dirent *crnt;
1256: u_char dirbuf[512]; /* holds converted dos directories */
1257: int i=0;
1258:
1259: #if defined(PCFSDEBUG)
1260: printf("pcfs_readdir(): vp %08x, uio %08x, cred %08x, eofflagp %08x\n",
1261: vp, uio, cred, eofflagp);
1262: #endif /* defined(PCFSDEBUG) */
1263:
1264: /*
1265: * pcfs_readdir() won't operate properly on regular files
1266: * since it does i/o only with the the filesystem vnode,
1267: * and hence can retrieve the wrong block from the buffer
1268: * cache for a plain file. So, fail attempts to readdir()
1269: * on a plain file.
1270: */
1271: if ((dep->de_Attributes & ATTR_DIRECTORY) == 0)
1272: return ENOTDIR;
1273:
1274: /*
1275: * If the user buffer is smaller than the size of one dos
1276: * directory entry or the file offset is not a multiple of
1277: * the size of a directory entry, then we fail the read.
1278: */
1279: count = uio->uio_resid & ~(sizeof(struct direntry)-1);
1280: lost = uio->uio_resid - count;
1281: if (count < sizeof(struct direntry) ||
1282: (uio->uio_offset & (sizeof(struct direntry)-1)))
1283: return EINVAL;
1284: uio->uio_resid = count;
1285: uio->uio_iov->iov_len = count;
1286:
1287: /*
1288: * If they are reading from the root directory then,
1289: * we simulate the . and .. entries since these don't
1290: * exist in the root directory. We also set the offset
1291: * bias to make up for having to simulate these entries.
1292: * By this I mean that at file offset 64 we read the first entry
1293: * in the root directory that lives on disk.
1294: */
1295: if (dep->de_StartCluster == PCFSROOT) {
1296: /*printf("pcfs_readdir(): going after . or .. in root dir, offset %d\n",
1297: uio->uio_offset);*/
1298: bias = 2*sizeof(struct direntry);
1299: if (uio->uio_offset < 2*sizeof(struct direntry)) {
1300: error = uiomove((char *)rootdots + uio->uio_offset,
1301: sizeof rootdots - uio->uio_offset, uio);
1302: if (error)
1303: goto out;
1304: }
1305: }
1306: do {
1307: lbn = (uio->uio_offset-bias) >> pmp->pm_cnshift;
1308: on = (uio->uio_offset-bias) & pmp->pm_crbomask;
1309: n = MIN((u_long)(pmp->pm_bpcluster - on), uio->uio_resid);
1310: diff = dep->de_FileSize - (uio->uio_offset - bias);
1311: if (diff <= 0)
1312: return 0;
1313: if (diff < n)
1314: n = diff;
1315: error = pcbmap(dep, lbn, &bn, &cn);
1316: if (error)
1317: break;
1318: error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, NOCRED, &bp);
1319: if (error) {
1320: brelse(bp);
1321: return error;
1322: }
1323: n = MIN(n, pmp->pm_bpcluster - bp->b_resid);
1324:
1325: /*
1326: * code to convert from dos directory entries to ufs directory entries
1327: */
1328: pushout = 0;
1329: dentp = (struct direntry *)(bp->b_un.b_addr + on);
1330: prev = 0;
1331: crnt = (struct dirent *)dirbuf;
1332: while ((char *)dentp < bp->b_un.b_addr + on + n) {
1333: /*printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n",
1334: dentp, prev, crnt, dentp->deName[0], dentp->deAttributes);*/
1335: /*
1336: * If we have an empty entry or a slot from a deleted
1337: * file, or a volume label entry just concatenate its
1338: * space onto the end of the previous entry or,
1339: * manufacture an empty entry if there is no previous
1340: * entry.
1341: */
1342: if (dentp->deName[0] == SLOT_EMPTY ||
1343: dentp->deName[0] == SLOT_DELETED ||
1344: (dentp->deAttributes & ATTR_VOLUME)) {
1345: if (prev) {
1346: prev->d_reclen += sizeof(struct direntry);
1347: } else {
1348: prev = crnt;
1349: prev->d_fileno = 0;
1350: prev->d_reclen = sizeof(struct direntry);
1351: prev->d_namlen = 0;
1352: prev->d_name[0] = 0;
1353: }
1354: } else {
1355: /* this computation of d_fileno must match
1356: * the computation of va_fileid in pcfs_getattr */
1357: if (dentp->deAttributes & ATTR_DIRECTORY) {
1358: /* if this is the root directory */
1359: if ((fileno = dentp->deStartCluster) == PCFSROOT)
1360: fileno = 1;
1361: } else {
1362: /* if the file's dirent lives in root dir */
1363: if ((fileno = cn) == PCFSROOT)
1364: fileno = 1;
1365: fileno = (fileno << 16) |
1366: ((dentp - (struct direntry *)bp->b_un.b_addr) & 0xffff);
1367: }
1368: crnt->d_fileno = fileno;
1369: crnt->d_reclen = sizeof(struct direntry);
1370: crnt->d_namlen = dos2unixfn(dentp->deName,
1371: (u_char *)crnt->d_name);
1372: /*printf("readdir: file %s, fileno %08x, attr %02x, start %08x\n",
1373: crnt->d_name, crnt->d_fileno, dentp->deAttributes, dentp->deStartCluster);*/
1374: prev = crnt;
1375: }
1376: crnt = (struct dirent *)((char *)crnt + sizeof(struct direntry));
1377: pushout = 1;
1378:
1379: /*
1380: * If our intermediate buffer is full then copy
1381: * its contents to user space.
1382: */
1383: if ((u_char *)crnt >= &dirbuf[sizeof dirbuf]) {
1384: pushout = 0;
1385: error = uiomove(dirbuf, sizeof(dirbuf), uio);
1386: if (error)
1387: break;
1388: prev = 0;
1389: crnt = (struct dirent *)dirbuf;
1390: }
1391: dentp++;
1392: }
1393: if (pushout) {
1394: pushout = 0;
1395: error = uiomove(dirbuf, (char *)crnt - (char *)dirbuf,
1396: uio);
1397: }
1398:
1399: /*
1400: * If we have read everything from this block or
1401: * have read to end of file then we are done with
1402: * this block. Mark it to say the buffer can be reused if
1403: * need be.
1404: */
1405: #if 0
1406: if (n + on == pmp->pm_bpcluster ||
1407: (uio->uio_offset-bias) == dep->de_FileSize)
1408: bp->b_flags |= B_AGE;
1409: #endif
1410: brelse(bp);
1411: } while (error == 0 && uio->uio_resid > 0 && n != 0);
1412: out:;
1413: uio->uio_resid += lost;
1414:
1415: /*
1416: * I don't know why we bother setting this eofflag, getdirentries()
1417: * in vfs_syscalls.c doesn't bother to look at it when we return.
1418: * But nfsrv_readdir does.
1419: */
1420: if (dep->de_FileSize - uio->uio_offset - bias <= 0)
1421: *eofflagp = 1;
1422: else
1423: *eofflagp = 0;
1424: return error;
1425: }
1426:
1427: /*
1428: * DOS filesystems don't know what symlinks are.
1429: */
1430: int
1431: pcfs_readlink(vp, uio, cred)
1432: struct vnode *vp;
1433: struct uio *uio;
1434: struct ucred *cred;
1435: {
1436: return EINVAL;
1437: }
1438:
1439: int
1440: pcfs_abortop(ndp)
1441: struct nameidata *ndp;
1442: {
1443: if ((ndp->ni_nameiop & (HASBUF | SAVESTART)) == HASBUF)
1444: FREE(ndp->ni_pnbuf, M_NAMEI);
1445: return 0;
1446: }
1447:
1448: int
1449: pcfs_lock(vp)
1450: struct vnode *vp;
1451: {
1452: struct denode *dep = VTODE(vp);
1453:
1454: DELOCK(dep);
1455: return 0;
1456: }
1457:
1458: int
1459: pcfs_unlock(vp)
1460: struct vnode *vp;
1461: {
1462: struct denode *dep = VTODE(vp);
1463:
1464: if (!(dep->de_flag & DELOCKED))
1465: panic("pcfs_unlock: denode not locked");
1466: DEUNLOCK(dep);
1467: return 0;
1468: }
1469:
1470: int
1471: pcfs_islocked(vp)
1472: struct vnode *vp;
1473: {
1474: return VTODE(vp)->de_flag & DELOCKED ? 1 : 0;
1475: }
1476:
1477: /*
1478: * vp - address of vnode file the file
1479: * bn - which cluster we are interested in mapping to
1480: * a filesystem block number.
1481: * vpp - returns the vnode for the block special file
1482: * holding the filesystem containing the file of interest
1483: * bnp - address of where to return the filesystem
1484: * relative block number
1485: */
1486: int
1487: pcfs_bmap(vp, bn, vpp, bnp)
1488: struct vnode *vp;
1489: daddr_t bn;
1490: struct vnode **vpp;
1491: daddr_t *bnp;
1492: {
1493: struct denode *dep = VTODE(vp);
1494: struct pcfsmount *pmp = dep->de_pmp;
1495:
1496: if (vpp != NULL)
1497: *vpp = dep->de_devvp;
1498: if (bnp == NULL)
1499: return 0;
1500: return pcbmap(dep, bn << (pmp->pm_cnshift - pmp->pm_bnshift), bnp, 0);
1501: }
1502:
1503: int
1504: pcfs_strategy(bp)
1505: struct buf *bp;
1506: {
1507: struct denode *dep = VTODE(bp->b_vp);
1508: struct pcfsmount *pmp = dep->de_pmp;
1509: struct vnode *vp;
1510: int error;
1511:
1512: if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR)
1513: panic("pcfs_strategy: spec");
1514: /*
1515: * If we don't already know the filesystem relative
1516: * block number then get it using pcbmap(). If pcbmap()
1517: * returns the block number as -1 then we've got a hole
1518: * in the file. DOS filesystems don't allow files with
1519: * holes, so we shouldn't ever see this.
1520: */
1521: if (bp->b_blkno == bp->b_lblkno) {
1522: if (error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0))
1523: return error;
1524: if ((long)bp->b_blkno == -1)
1525: clrbuf(bp);
1526: }
1527: if ((long)bp->b_blkno == -1) {
1528: biodone(bp);
1529: return 0;
1530: }
1531: #ifdef DIAGNOSTIC
1532: #endif /* defined(DIAGNOSTIC) */
1533: /*
1534: * Read/write the block from/to the disk that contains the desired
1535: * file block.
1536: */
1537: vp = dep->de_devvp;
1538: bp->b_dev = vp->v_rdev;
1539: (*(vp->v_op->vop_strategy))(bp);
1540: return 0;
1541: }
1542:
1543: int
1544: pcfs_print(vp)
1545: struct vnode *vp;
1546: {
1547: struct denode *dep = VTODE(vp);
1548:
1549: printf("tag VT_MSDOSFS, startcluster %d, dircluster %d, diroffset %d ",
1550: dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset);
1551: printf(" dev %d, %d, %s\n",
1552: major(dep->de_dev), minor(dep->de_dev),
1553: dep->de_flag & DELOCKED ? "(LOCKED)" : "");
1554: if (dep->de_spare0) {
1555: printf(" owner pid %d", dep->de_spare0);
1556: if (dep->de_spare1)
1557: printf(" waiting pid %d", dep->de_spare1);
1558: printf("\n");
1559: }
1560: }
1561:
1562: int
1563: pcfs_advlock(vp, id, op, fl, flags)
1564: struct vnode *vp;
1565: caddr_t id;
1566: int op;
1567: struct flock *fl;
1568: int flags;
1569: {
1570: return EINVAL; /* we don't do locking yet */
1571: }
1572:
1573: struct vnodeops pcfs_vnodeops = {
1574: pcfs_lookup,
1575: pcfs_create,
1576: pcfs_mknod,
1577: pcfs_open,
1578: pcfs_close,
1579: pcfs_access,
1580: pcfs_getattr,
1581: pcfs_setattr,
1582: pcfs_read,
1583: pcfs_write,
1584: pcfs_ioctl,
1585: pcfs_select,
1586: pcfs_mmap,
1587: pcfs_fsync,
1588: pcfs_seek,
1589: pcfs_remove,
1590: pcfs_link,
1591: pcfs_rename,
1592: pcfs_mkdir,
1593: pcfs_rmdir,
1594: pcfs_symlink,
1595: pcfs_readdir,
1596: pcfs_readlink,
1597: pcfs_abortop,
1598: pcfs_inactive,
1599: pcfs_reclaim,
1600: pcfs_lock,
1601: pcfs_unlock,
1602: pcfs_bmap,
1603: pcfs_strategy,
1604: pcfs_print,
1605: pcfs_islocked,
1606: pcfs_advlock,
1607: };
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