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v3.1
  1/*
  2 * JFFS2 -- Journalling Flash File System, Version 2.
  3 *
  4 * Copyright © 2001-2007 Red Hat, Inc.
  5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
  6 *
  7 * Created by David Woodhouse <dwmw2@infradead.org>
  8 *
  9 * For licensing information, see the file 'LICENCE' in this directory.
 10 *
 11 */
 12
 
 
 13#include <linux/kernel.h>
 14#include <linux/slab.h>
 15#include <linux/fs.h>
 16#include <linux/crc32.h>
 17#include <linux/jffs2.h>
 18#include "jffs2_fs_i.h"
 19#include "jffs2_fs_sb.h"
 20#include <linux/time.h>
 21#include "nodelist.h"
 22
 23static int jffs2_readdir (struct file *, void *, filldir_t);
 24
 25static int jffs2_create (struct inode *,struct dentry *,int,
 26			 struct nameidata *);
 27static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
 28				    struct nameidata *);
 29static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
 30static int jffs2_unlink (struct inode *,struct dentry *);
 31static int jffs2_symlink (struct inode *,struct dentry *,const char *);
 32static int jffs2_mkdir (struct inode *,struct dentry *,int);
 33static int jffs2_rmdir (struct inode *,struct dentry *);
 34static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
 35static int jffs2_rename (struct inode *, struct dentry *,
 36			 struct inode *, struct dentry *);
 
 37
 38const struct file_operations jffs2_dir_operations =
 39{
 40	.read =		generic_read_dir,
 41	.readdir =	jffs2_readdir,
 42	.unlocked_ioctl=jffs2_ioctl,
 43	.fsync =	jffs2_fsync,
 44	.llseek =	generic_file_llseek,
 45};
 46
 47
 48const struct inode_operations jffs2_dir_inode_operations =
 49{
 50	.create =	jffs2_create,
 51	.lookup =	jffs2_lookup,
 52	.link =		jffs2_link,
 53	.unlink =	jffs2_unlink,
 54	.symlink =	jffs2_symlink,
 55	.mkdir =	jffs2_mkdir,
 56	.rmdir =	jffs2_rmdir,
 57	.mknod =	jffs2_mknod,
 58	.rename =	jffs2_rename,
 59	.get_acl =	jffs2_get_acl,
 
 60	.setattr =	jffs2_setattr,
 61	.setxattr =	jffs2_setxattr,
 62	.getxattr =	jffs2_getxattr,
 63	.listxattr =	jffs2_listxattr,
 64	.removexattr =	jffs2_removexattr
 65};
 66
 67/***********************************************************************/
 68
 69
 70/* We keep the dirent list sorted in increasing order of name hash,
 71   and we use the same hash function as the dentries. Makes this
 72   nice and simple
 73*/
 74static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
 75				   struct nameidata *nd)
 76{
 77	struct jffs2_inode_info *dir_f;
 78	struct jffs2_full_dirent *fd = NULL, *fd_list;
 79	uint32_t ino = 0;
 80	struct inode *inode = NULL;
 
 81
 82	D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
 83
 84	if (target->d_name.len > JFFS2_MAX_NAME_LEN)
 85		return ERR_PTR(-ENAMETOOLONG);
 86
 87	dir_f = JFFS2_INODE_INFO(dir_i);
 88
 
 
 
 89	mutex_lock(&dir_f->sem);
 90
 91	/* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
 92	for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
 93		if (fd_list->nhash == target->d_name.hash &&
 94		    (!fd || fd_list->version > fd->version) &&
 95		    strlen(fd_list->name) == target->d_name.len &&
 96		    !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
 97			fd = fd_list;
 98		}
 99	}
100	if (fd)
101		ino = fd->ino;
102	mutex_unlock(&dir_f->sem);
103	if (ino) {
104		inode = jffs2_iget(dir_i->i_sb, ino);
105		if (IS_ERR(inode))
106			printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
107	}
108
109	return d_splice_alias(inode, target);
110}
111
112/***********************************************************************/
113
114
115static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
116{
117	struct jffs2_inode_info *f;
118	struct inode *inode = filp->f_path.dentry->d_inode;
119	struct jffs2_full_dirent *fd;
120	unsigned long offset, curofs;
121
122	D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
123
124	f = JFFS2_INODE_INFO(inode);
125
126	offset = filp->f_pos;
127
128	if (offset == 0) {
129		D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
130		if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
131			goto out;
132		offset++;
133	}
134	if (offset == 1) {
135		unsigned long pino = parent_ino(filp->f_path.dentry);
136		D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
137		if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
138			goto out;
139		offset++;
140	}
141
142	curofs=1;
143	mutex_lock(&f->sem);
144	for (fd = f->dents; fd; fd = fd->next) {
145
146		curofs++;
147		/* First loop: curofs = 2; offset = 2 */
148		if (curofs < offset) {
149			D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
150				  fd->name, fd->ino, fd->type, curofs, offset));
151			continue;
152		}
153		if (!fd->ino) {
154			D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
155			offset++;
 
156			continue;
157		}
158		D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
159		if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
 
160			break;
161		offset++;
162	}
163	mutex_unlock(&f->sem);
164 out:
165	filp->f_pos = offset;
166	return 0;
167}
168
169/***********************************************************************/
170
171
172static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
173			struct nameidata *nd)
174{
175	struct jffs2_raw_inode *ri;
176	struct jffs2_inode_info *f, *dir_f;
177	struct jffs2_sb_info *c;
178	struct inode *inode;
179	int ret;
180
181	ri = jffs2_alloc_raw_inode();
182	if (!ri)
183		return -ENOMEM;
184
185	c = JFFS2_SB_INFO(dir_i->i_sb);
186
187	D1(printk(KERN_DEBUG "jffs2_create()\n"));
188
189	inode = jffs2_new_inode(dir_i, mode, ri);
190
191	if (IS_ERR(inode)) {
192		D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
193		jffs2_free_raw_inode(ri);
194		return PTR_ERR(inode);
195	}
196
197	inode->i_op = &jffs2_file_inode_operations;
198	inode->i_fop = &jffs2_file_operations;
199	inode->i_mapping->a_ops = &jffs2_file_address_operations;
200	inode->i_mapping->nrpages = 0;
201
202	f = JFFS2_INODE_INFO(inode);
203	dir_f = JFFS2_INODE_INFO(dir_i);
204
205	/* jffs2_do_create() will want to lock it, _after_ reserving
206	   space and taking c-alloc_sem. If we keep it locked here,
207	   lockdep gets unhappy (although it's a false positive;
208	   nothing else will be looking at this inode yet so there's
209	   no chance of AB-BA deadlock involving its f->sem). */
210	mutex_unlock(&f->sem);
211
212	ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
213	if (ret)
214		goto fail;
215
216	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
217
218	jffs2_free_raw_inode(ri);
219
220	D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
221		  inode->i_ino, inode->i_mode, inode->i_nlink,
222		  f->inocache->pino_nlink, inode->i_mapping->nrpages));
223
224	d_instantiate(dentry, inode);
225	unlock_new_inode(inode);
226	return 0;
227
228 fail:
229	iget_failed(inode);
230	jffs2_free_raw_inode(ri);
231	return ret;
232}
233
234/***********************************************************************/
235
236
237static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
238{
239	struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
240	struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
241	struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
242	int ret;
243	uint32_t now = get_seconds();
244
245	ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
246			      dentry->d_name.len, dead_f, now);
247	if (dead_f->inocache)
248		dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
249	if (!ret)
250		dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
251	return ret;
252}
253/***********************************************************************/
254
255
256static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
257{
258	struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
259	struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
260	struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
261	int ret;
262	uint8_t type;
263	uint32_t now;
264
265	/* Don't let people make hard links to bad inodes. */
266	if (!f->inocache)
267		return -EIO;
268
269	if (S_ISDIR(old_dentry->d_inode->i_mode))
270		return -EPERM;
271
272	/* XXX: This is ugly */
273	type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
274	if (!type) type = DT_REG;
275
276	now = get_seconds();
277	ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
278
279	if (!ret) {
280		mutex_lock(&f->sem);
281		old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
282		mutex_unlock(&f->sem);
283		d_instantiate(dentry, old_dentry->d_inode);
284		dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
285		ihold(old_dentry->d_inode);
286	}
287	return ret;
288}
289
290/***********************************************************************/
291
292static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
293{
294	struct jffs2_inode_info *f, *dir_f;
295	struct jffs2_sb_info *c;
296	struct inode *inode;
297	struct jffs2_raw_inode *ri;
298	struct jffs2_raw_dirent *rd;
299	struct jffs2_full_dnode *fn;
300	struct jffs2_full_dirent *fd;
301	int namelen;
302	uint32_t alloclen;
303	int ret, targetlen = strlen(target);
304
305	/* FIXME: If you care. We'd need to use frags for the target
306	   if it grows much more than this */
307	if (targetlen > 254)
308		return -ENAMETOOLONG;
309
310	ri = jffs2_alloc_raw_inode();
311
312	if (!ri)
313		return -ENOMEM;
314
315	c = JFFS2_SB_INFO(dir_i->i_sb);
316
317	/* Try to reserve enough space for both node and dirent.
318	 * Just the node will do for now, though
319	 */
320	namelen = dentry->d_name.len;
321	ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
322				  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
323
324	if (ret) {
325		jffs2_free_raw_inode(ri);
326		return ret;
327	}
328
329	inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
330
331	if (IS_ERR(inode)) {
332		jffs2_free_raw_inode(ri);
333		jffs2_complete_reservation(c);
334		return PTR_ERR(inode);
335	}
336
337	inode->i_op = &jffs2_symlink_inode_operations;
338
339	f = JFFS2_INODE_INFO(inode);
340
341	inode->i_size = targetlen;
342	ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
343	ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
344	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
345
346	ri->compr = JFFS2_COMPR_NONE;
347	ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
348	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
349
350	fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
351
352	jffs2_free_raw_inode(ri);
353
354	if (IS_ERR(fn)) {
355		/* Eeek. Wave bye bye */
356		mutex_unlock(&f->sem);
357		jffs2_complete_reservation(c);
358		ret = PTR_ERR(fn);
359		goto fail;
360	}
361
362	/* We use f->target field to store the target path. */
363	f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
364	if (!f->target) {
365		printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
366		mutex_unlock(&f->sem);
367		jffs2_complete_reservation(c);
368		ret = -ENOMEM;
369		goto fail;
370	}
 
371
372	D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
 
373
374	/* No data here. Only a metadata node, which will be
375	   obsoleted by the first data write
376	*/
377	f->metadata = fn;
378	mutex_unlock(&f->sem);
379
380	jffs2_complete_reservation(c);
381
382	ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
383	if (ret)
384		goto fail;
385
386	ret = jffs2_init_acl_post(inode);
387	if (ret)
388		goto fail;
389
390	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
391				  ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
392	if (ret)
393		goto fail;
394
395	rd = jffs2_alloc_raw_dirent();
396	if (!rd) {
397		/* Argh. Now we treat it like a normal delete */
398		jffs2_complete_reservation(c);
399		ret = -ENOMEM;
400		goto fail;
401	}
402
403	dir_f = JFFS2_INODE_INFO(dir_i);
404	mutex_lock(&dir_f->sem);
405
406	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
407	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
408	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
409	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
410
411	rd->pino = cpu_to_je32(dir_i->i_ino);
412	rd->version = cpu_to_je32(++dir_f->highest_version);
413	rd->ino = cpu_to_je32(inode->i_ino);
414	rd->mctime = cpu_to_je32(get_seconds());
415	rd->nsize = namelen;
416	rd->type = DT_LNK;
417	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
418	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
419
420	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
421
422	if (IS_ERR(fd)) {
423		/* dirent failed to write. Delete the inode normally
424		   as if it were the final unlink() */
425		jffs2_complete_reservation(c);
426		jffs2_free_raw_dirent(rd);
427		mutex_unlock(&dir_f->sem);
428		ret = PTR_ERR(fd);
429		goto fail;
430	}
431
432	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
433
434	jffs2_free_raw_dirent(rd);
435
436	/* Link the fd into the inode's list, obsoleting an old
437	   one if necessary. */
438	jffs2_add_fd_to_list(c, fd, &dir_f->dents);
439
440	mutex_unlock(&dir_f->sem);
441	jffs2_complete_reservation(c);
442
443	d_instantiate(dentry, inode);
444	unlock_new_inode(inode);
445	return 0;
446
447 fail:
448	iget_failed(inode);
449	return ret;
450}
451
452
453static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
454{
455	struct jffs2_inode_info *f, *dir_f;
456	struct jffs2_sb_info *c;
457	struct inode *inode;
458	struct jffs2_raw_inode *ri;
459	struct jffs2_raw_dirent *rd;
460	struct jffs2_full_dnode *fn;
461	struct jffs2_full_dirent *fd;
462	int namelen;
463	uint32_t alloclen;
464	int ret;
465
466	mode |= S_IFDIR;
467
468	ri = jffs2_alloc_raw_inode();
469	if (!ri)
470		return -ENOMEM;
471
472	c = JFFS2_SB_INFO(dir_i->i_sb);
473
474	/* Try to reserve enough space for both node and dirent.
475	 * Just the node will do for now, though
476	 */
477	namelen = dentry->d_name.len;
478	ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
479				  JFFS2_SUMMARY_INODE_SIZE);
480
481	if (ret) {
482		jffs2_free_raw_inode(ri);
483		return ret;
484	}
485
486	inode = jffs2_new_inode(dir_i, mode, ri);
487
488	if (IS_ERR(inode)) {
489		jffs2_free_raw_inode(ri);
490		jffs2_complete_reservation(c);
491		return PTR_ERR(inode);
492	}
493
494	inode->i_op = &jffs2_dir_inode_operations;
495	inode->i_fop = &jffs2_dir_operations;
496
497	f = JFFS2_INODE_INFO(inode);
498
499	/* Directories get nlink 2 at start */
500	inode->i_nlink = 2;
501	/* but ic->pino_nlink is the parent ino# */
502	f->inocache->pino_nlink = dir_i->i_ino;
503
504	ri->data_crc = cpu_to_je32(0);
505	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
506
507	fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
508
509	jffs2_free_raw_inode(ri);
510
511	if (IS_ERR(fn)) {
512		/* Eeek. Wave bye bye */
513		mutex_unlock(&f->sem);
514		jffs2_complete_reservation(c);
515		ret = PTR_ERR(fn);
516		goto fail;
517	}
518	/* No data here. Only a metadata node, which will be
519	   obsoleted by the first data write
520	*/
521	f->metadata = fn;
522	mutex_unlock(&f->sem);
523
524	jffs2_complete_reservation(c);
525
526	ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
527	if (ret)
528		goto fail;
529
530	ret = jffs2_init_acl_post(inode);
531	if (ret)
532		goto fail;
533
534	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
535				  ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
536	if (ret)
537		goto fail;
538
539	rd = jffs2_alloc_raw_dirent();
540	if (!rd) {
541		/* Argh. Now we treat it like a normal delete */
542		jffs2_complete_reservation(c);
543		ret = -ENOMEM;
544		goto fail;
545	}
546
547	dir_f = JFFS2_INODE_INFO(dir_i);
548	mutex_lock(&dir_f->sem);
549
550	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
551	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
552	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
553	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
554
555	rd->pino = cpu_to_je32(dir_i->i_ino);
556	rd->version = cpu_to_je32(++dir_f->highest_version);
557	rd->ino = cpu_to_je32(inode->i_ino);
558	rd->mctime = cpu_to_je32(get_seconds());
559	rd->nsize = namelen;
560	rd->type = DT_DIR;
561	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
562	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
563
564	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
565
566	if (IS_ERR(fd)) {
567		/* dirent failed to write. Delete the inode normally
568		   as if it were the final unlink() */
569		jffs2_complete_reservation(c);
570		jffs2_free_raw_dirent(rd);
571		mutex_unlock(&dir_f->sem);
572		ret = PTR_ERR(fd);
573		goto fail;
574	}
575
576	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
577	inc_nlink(dir_i);
578
579	jffs2_free_raw_dirent(rd);
580
581	/* Link the fd into the inode's list, obsoleting an old
582	   one if necessary. */
583	jffs2_add_fd_to_list(c, fd, &dir_f->dents);
584
585	mutex_unlock(&dir_f->sem);
586	jffs2_complete_reservation(c);
587
588	d_instantiate(dentry, inode);
589	unlock_new_inode(inode);
590	return 0;
591
592 fail:
593	iget_failed(inode);
594	return ret;
595}
596
597static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
598{
599	struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
600	struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
601	struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
602	struct jffs2_full_dirent *fd;
603	int ret;
604	uint32_t now = get_seconds();
605
606	for (fd = f->dents ; fd; fd = fd->next) {
607		if (fd->ino)
608			return -ENOTEMPTY;
609	}
610
611	ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
612			      dentry->d_name.len, f, now);
613	if (!ret) {
614		dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
615		clear_nlink(dentry->d_inode);
616		drop_nlink(dir_i);
617	}
618	return ret;
619}
620
621static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
622{
623	struct jffs2_inode_info *f, *dir_f;
624	struct jffs2_sb_info *c;
625	struct inode *inode;
626	struct jffs2_raw_inode *ri;
627	struct jffs2_raw_dirent *rd;
628	struct jffs2_full_dnode *fn;
629	struct jffs2_full_dirent *fd;
630	int namelen;
631	union jffs2_device_node dev;
632	int devlen = 0;
633	uint32_t alloclen;
634	int ret;
635
636	if (!new_valid_dev(rdev))
637		return -EINVAL;
638
639	ri = jffs2_alloc_raw_inode();
640	if (!ri)
641		return -ENOMEM;
642
643	c = JFFS2_SB_INFO(dir_i->i_sb);
644
645	if (S_ISBLK(mode) || S_ISCHR(mode))
646		devlen = jffs2_encode_dev(&dev, rdev);
647
648	/* Try to reserve enough space for both node and dirent.
649	 * Just the node will do for now, though
650	 */
651	namelen = dentry->d_name.len;
652	ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
653				  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
654
655	if (ret) {
656		jffs2_free_raw_inode(ri);
657		return ret;
658	}
659
660	inode = jffs2_new_inode(dir_i, mode, ri);
661
662	if (IS_ERR(inode)) {
663		jffs2_free_raw_inode(ri);
664		jffs2_complete_reservation(c);
665		return PTR_ERR(inode);
666	}
667	inode->i_op = &jffs2_file_inode_operations;
668	init_special_inode(inode, inode->i_mode, rdev);
669
670	f = JFFS2_INODE_INFO(inode);
671
672	ri->dsize = ri->csize = cpu_to_je32(devlen);
673	ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
674	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
675
676	ri->compr = JFFS2_COMPR_NONE;
677	ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
678	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
679
680	fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
681
682	jffs2_free_raw_inode(ri);
683
684	if (IS_ERR(fn)) {
685		/* Eeek. Wave bye bye */
686		mutex_unlock(&f->sem);
687		jffs2_complete_reservation(c);
688		ret = PTR_ERR(fn);
689		goto fail;
690	}
691	/* No data here. Only a metadata node, which will be
692	   obsoleted by the first data write
693	*/
694	f->metadata = fn;
695	mutex_unlock(&f->sem);
696
697	jffs2_complete_reservation(c);
698
699	ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
700	if (ret)
701		goto fail;
702
703	ret = jffs2_init_acl_post(inode);
704	if (ret)
705		goto fail;
706
707	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
708				  ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
709	if (ret)
710		goto fail;
711
712	rd = jffs2_alloc_raw_dirent();
713	if (!rd) {
714		/* Argh. Now we treat it like a normal delete */
715		jffs2_complete_reservation(c);
716		ret = -ENOMEM;
717		goto fail;
718	}
719
720	dir_f = JFFS2_INODE_INFO(dir_i);
721	mutex_lock(&dir_f->sem);
722
723	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
724	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
725	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
726	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
727
728	rd->pino = cpu_to_je32(dir_i->i_ino);
729	rd->version = cpu_to_je32(++dir_f->highest_version);
730	rd->ino = cpu_to_je32(inode->i_ino);
731	rd->mctime = cpu_to_je32(get_seconds());
732	rd->nsize = namelen;
733
734	/* XXX: This is ugly. */
735	rd->type = (mode & S_IFMT) >> 12;
736
737	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
738	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
739
740	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
741
742	if (IS_ERR(fd)) {
743		/* dirent failed to write. Delete the inode normally
744		   as if it were the final unlink() */
745		jffs2_complete_reservation(c);
746		jffs2_free_raw_dirent(rd);
747		mutex_unlock(&dir_f->sem);
748		ret = PTR_ERR(fd);
749		goto fail;
750	}
751
752	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
753
754	jffs2_free_raw_dirent(rd);
755
756	/* Link the fd into the inode's list, obsoleting an old
757	   one if necessary. */
758	jffs2_add_fd_to_list(c, fd, &dir_f->dents);
759
760	mutex_unlock(&dir_f->sem);
761	jffs2_complete_reservation(c);
762
763	d_instantiate(dentry, inode);
764	unlock_new_inode(inode);
765	return 0;
766
767 fail:
768	iget_failed(inode);
769	return ret;
770}
771
772static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
773			 struct inode *new_dir_i, struct dentry *new_dentry)
 
774{
775	int ret;
776	struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
777	struct jffs2_inode_info *victim_f = NULL;
778	uint8_t type;
779	uint32_t now;
780
 
 
 
781	/* The VFS will check for us and prevent trying to rename a
782	 * file over a directory and vice versa, but if it's a directory,
783	 * the VFS can't check whether the victim is empty. The filesystem
784	 * needs to do that for itself.
785	 */
786	if (new_dentry->d_inode) {
787		victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
788		if (S_ISDIR(new_dentry->d_inode->i_mode)) {
789			struct jffs2_full_dirent *fd;
790
791			mutex_lock(&victim_f->sem);
792			for (fd = victim_f->dents; fd; fd = fd->next) {
793				if (fd->ino) {
794					mutex_unlock(&victim_f->sem);
795					return -ENOTEMPTY;
796				}
797			}
798			mutex_unlock(&victim_f->sem);
799		}
800	}
801
802	/* XXX: We probably ought to alloc enough space for
803	   both nodes at the same time. Writing the new link,
804	   then getting -ENOSPC, is quite bad :)
805	*/
806
807	/* Make a hard link */
808
809	/* XXX: This is ugly */
810	type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
811	if (!type) type = DT_REG;
812
813	now = get_seconds();
814	ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
815			    old_dentry->d_inode->i_ino, type,
816			    new_dentry->d_name.name, new_dentry->d_name.len, now);
817
818	if (ret)
819		return ret;
820
821	if (victim_f) {
822		/* There was a victim. Kill it off nicely */
823		if (S_ISDIR(new_dentry->d_inode->i_mode))
824			clear_nlink(new_dentry->d_inode);
825		else
826			drop_nlink(new_dentry->d_inode);
827		/* Don't oops if the victim was a dirent pointing to an
828		   inode which didn't exist. */
829		if (victim_f->inocache) {
830			mutex_lock(&victim_f->sem);
831			if (S_ISDIR(new_dentry->d_inode->i_mode))
832				victim_f->inocache->pino_nlink = 0;
833			else
834				victim_f->inocache->pino_nlink--;
835			mutex_unlock(&victim_f->sem);
836		}
837	}
838
839	/* If it was a directory we moved, and there was no victim,
840	   increase i_nlink on its new parent */
841	if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
842		inc_nlink(new_dir_i);
843
844	/* Unlink the original */
845	ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
846			      old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
847
848	/* We don't touch inode->i_nlink */
849
850	if (ret) {
851		/* Oh shit. We really ought to make a single node which can do both atomically */
852		struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
853		mutex_lock(&f->sem);
854		inc_nlink(old_dentry->d_inode);
855		if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
856			f->inocache->pino_nlink++;
857		mutex_unlock(&f->sem);
858
859		printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
860		/* Might as well let the VFS know */
861		d_instantiate(new_dentry, old_dentry->d_inode);
862		ihold(old_dentry->d_inode);
 
 
 
 
 
 
863		new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
864		return ret;
865	}
866
867	if (S_ISDIR(old_dentry->d_inode->i_mode))
868		drop_nlink(old_dir_i);
869
870	new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
871
872	return 0;
873}
874
v5.4
  1/*
  2 * JFFS2 -- Journalling Flash File System, Version 2.
  3 *
  4 * Copyright © 2001-2007 Red Hat, Inc.
  5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
  6 *
  7 * Created by David Woodhouse <dwmw2@infradead.org>
  8 *
  9 * For licensing information, see the file 'LICENCE' in this directory.
 10 *
 11 */
 12
 13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 14
 15#include <linux/kernel.h>
 16#include <linux/slab.h>
 17#include <linux/fs.h>
 18#include <linux/crc32.h>
 19#include <linux/jffs2.h>
 20#include "jffs2_fs_i.h"
 21#include "jffs2_fs_sb.h"
 22#include <linux/time.h>
 23#include "nodelist.h"
 24
 25static int jffs2_readdir (struct file *, struct dir_context *);
 26
 27static int jffs2_create (struct inode *,struct dentry *,umode_t,
 28			 bool);
 29static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
 30				    unsigned int);
 31static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
 32static int jffs2_unlink (struct inode *,struct dentry *);
 33static int jffs2_symlink (struct inode *,struct dentry *,const char *);
 34static int jffs2_mkdir (struct inode *,struct dentry *,umode_t);
 35static int jffs2_rmdir (struct inode *,struct dentry *);
 36static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
 37static int jffs2_rename (struct inode *, struct dentry *,
 38			 struct inode *, struct dentry *,
 39			 unsigned int);
 40
 41const struct file_operations jffs2_dir_operations =
 42{
 43	.read =		generic_read_dir,
 44	.iterate_shared=jffs2_readdir,
 45	.unlocked_ioctl=jffs2_ioctl,
 46	.fsync =	jffs2_fsync,
 47	.llseek =	generic_file_llseek,
 48};
 49
 50
 51const struct inode_operations jffs2_dir_inode_operations =
 52{
 53	.create =	jffs2_create,
 54	.lookup =	jffs2_lookup,
 55	.link =		jffs2_link,
 56	.unlink =	jffs2_unlink,
 57	.symlink =	jffs2_symlink,
 58	.mkdir =	jffs2_mkdir,
 59	.rmdir =	jffs2_rmdir,
 60	.mknod =	jffs2_mknod,
 61	.rename =	jffs2_rename,
 62	.get_acl =	jffs2_get_acl,
 63	.set_acl =	jffs2_set_acl,
 64	.setattr =	jffs2_setattr,
 
 
 65	.listxattr =	jffs2_listxattr,
 
 66};
 67
 68/***********************************************************************/
 69
 70
 71/* We keep the dirent list sorted in increasing order of name hash,
 72   and we use the same hash function as the dentries. Makes this
 73   nice and simple
 74*/
 75static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
 76				   unsigned int flags)
 77{
 78	struct jffs2_inode_info *dir_f;
 79	struct jffs2_full_dirent *fd = NULL, *fd_list;
 80	uint32_t ino = 0;
 81	struct inode *inode = NULL;
 82	unsigned int nhash;
 83
 84	jffs2_dbg(1, "jffs2_lookup()\n");
 85
 86	if (target->d_name.len > JFFS2_MAX_NAME_LEN)
 87		return ERR_PTR(-ENAMETOOLONG);
 88
 89	dir_f = JFFS2_INODE_INFO(dir_i);
 90
 91	/* The 'nhash' on the fd_list is not the same as the dentry hash */
 92	nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len);
 93
 94	mutex_lock(&dir_f->sem);
 95
 96	/* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
 97	for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) {
 98		if (fd_list->nhash == nhash &&
 99		    (!fd || fd_list->version > fd->version) &&
100		    strlen(fd_list->name) == target->d_name.len &&
101		    !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
102			fd = fd_list;
103		}
104	}
105	if (fd)
106		ino = fd->ino;
107	mutex_unlock(&dir_f->sem);
108	if (ino) {
109		inode = jffs2_iget(dir_i->i_sb, ino);
110		if (IS_ERR(inode))
111			pr_warn("iget() failed for ino #%u\n", ino);
112	}
113
114	return d_splice_alias(inode, target);
115}
116
117/***********************************************************************/
118
119
120static int jffs2_readdir(struct file *file, struct dir_context *ctx)
121{
122	struct inode *inode = file_inode(file);
123	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
124	struct jffs2_full_dirent *fd;
125	unsigned long curofs = 1;
 
 
126
127	jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino);
 
 
128
129	if (!dir_emit_dots(file, ctx))
130		return 0;
 
 
 
 
 
 
 
 
 
 
 
131
 
132	mutex_lock(&f->sem);
133	for (fd = f->dents; fd; fd = fd->next) {
 
134		curofs++;
135		/* First loop: curofs = 2; pos = 2 */
136		if (curofs < ctx->pos) {
137			jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
138				  fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos);
139			continue;
140		}
141		if (!fd->ino) {
142			jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
143				  fd->name);
144			ctx->pos++;
145			continue;
146		}
147		jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
148			  (unsigned long)ctx->pos, fd->name, fd->ino, fd->type);
149		if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type))
150			break;
151		ctx->pos++;
152	}
153	mutex_unlock(&f->sem);
 
 
154	return 0;
155}
156
157/***********************************************************************/
158
159
160static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
161			umode_t mode, bool excl)
162{
163	struct jffs2_raw_inode *ri;
164	struct jffs2_inode_info *f, *dir_f;
165	struct jffs2_sb_info *c;
166	struct inode *inode;
167	int ret;
168
169	ri = jffs2_alloc_raw_inode();
170	if (!ri)
171		return -ENOMEM;
172
173	c = JFFS2_SB_INFO(dir_i->i_sb);
174
175	jffs2_dbg(1, "%s()\n", __func__);
176
177	inode = jffs2_new_inode(dir_i, mode, ri);
178
179	if (IS_ERR(inode)) {
180		jffs2_dbg(1, "jffs2_new_inode() failed\n");
181		jffs2_free_raw_inode(ri);
182		return PTR_ERR(inode);
183	}
184
185	inode->i_op = &jffs2_file_inode_operations;
186	inode->i_fop = &jffs2_file_operations;
187	inode->i_mapping->a_ops = &jffs2_file_address_operations;
188	inode->i_mapping->nrpages = 0;
189
190	f = JFFS2_INODE_INFO(inode);
191	dir_f = JFFS2_INODE_INFO(dir_i);
192
193	/* jffs2_do_create() will want to lock it, _after_ reserving
194	   space and taking c-alloc_sem. If we keep it locked here,
195	   lockdep gets unhappy (although it's a false positive;
196	   nothing else will be looking at this inode yet so there's
197	   no chance of AB-BA deadlock involving its f->sem). */
198	mutex_unlock(&f->sem);
199
200	ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
201	if (ret)
202		goto fail;
203
204	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
205
206	jffs2_free_raw_inode(ri);
207
208	jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
209		  __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
210		  f->inocache->pino_nlink, inode->i_mapping->nrpages);
211
212	d_instantiate_new(dentry, inode);
 
213	return 0;
214
215 fail:
216	iget_failed(inode);
217	jffs2_free_raw_inode(ri);
218	return ret;
219}
220
221/***********************************************************************/
222
223
224static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
225{
226	struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
227	struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
228	struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry));
229	int ret;
230	uint32_t now = JFFS2_NOW();
231
232	ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
233			      dentry->d_name.len, dead_f, now);
234	if (dead_f->inocache)
235		set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink);
236	if (!ret)
237		dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
238	return ret;
239}
240/***********************************************************************/
241
242
243static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
244{
245	struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb);
246	struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
247	struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
248	int ret;
249	uint8_t type;
250	uint32_t now;
251
252	/* Don't let people make hard links to bad inodes. */
253	if (!f->inocache)
254		return -EIO;
255
256	if (d_is_dir(old_dentry))
257		return -EPERM;
258
259	/* XXX: This is ugly */
260	type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
261	if (!type) type = DT_REG;
262
263	now = JFFS2_NOW();
264	ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
265
266	if (!ret) {
267		mutex_lock(&f->sem);
268		set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink);
269		mutex_unlock(&f->sem);
270		d_instantiate(dentry, d_inode(old_dentry));
271		dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
272		ihold(d_inode(old_dentry));
273	}
274	return ret;
275}
276
277/***********************************************************************/
278
279static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
280{
281	struct jffs2_inode_info *f, *dir_f;
282	struct jffs2_sb_info *c;
283	struct inode *inode;
284	struct jffs2_raw_inode *ri;
285	struct jffs2_raw_dirent *rd;
286	struct jffs2_full_dnode *fn;
287	struct jffs2_full_dirent *fd;
288	int namelen;
289	uint32_t alloclen;
290	int ret, targetlen = strlen(target);
291
292	/* FIXME: If you care. We'd need to use frags for the target
293	   if it grows much more than this */
294	if (targetlen > 254)
295		return -ENAMETOOLONG;
296
297	ri = jffs2_alloc_raw_inode();
298
299	if (!ri)
300		return -ENOMEM;
301
302	c = JFFS2_SB_INFO(dir_i->i_sb);
303
304	/* Try to reserve enough space for both node and dirent.
305	 * Just the node will do for now, though
306	 */
307	namelen = dentry->d_name.len;
308	ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
309				  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
310
311	if (ret) {
312		jffs2_free_raw_inode(ri);
313		return ret;
314	}
315
316	inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
317
318	if (IS_ERR(inode)) {
319		jffs2_free_raw_inode(ri);
320		jffs2_complete_reservation(c);
321		return PTR_ERR(inode);
322	}
323
324	inode->i_op = &jffs2_symlink_inode_operations;
325
326	f = JFFS2_INODE_INFO(inode);
327
328	inode->i_size = targetlen;
329	ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
330	ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
331	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
332
333	ri->compr = JFFS2_COMPR_NONE;
334	ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
335	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
336
337	fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
338
339	jffs2_free_raw_inode(ri);
340
341	if (IS_ERR(fn)) {
342		/* Eeek. Wave bye bye */
343		mutex_unlock(&f->sem);
344		jffs2_complete_reservation(c);
345		ret = PTR_ERR(fn);
346		goto fail;
347	}
348
349	/* We use f->target field to store the target path. */
350	f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
351	if (!f->target) {
352		pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
353		mutex_unlock(&f->sem);
354		jffs2_complete_reservation(c);
355		ret = -ENOMEM;
356		goto fail;
357	}
358	inode->i_link = f->target;
359
360	jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
361		  __func__, (char *)f->target);
362
363	/* No data here. Only a metadata node, which will be
364	   obsoleted by the first data write
365	*/
366	f->metadata = fn;
367	mutex_unlock(&f->sem);
368
369	jffs2_complete_reservation(c);
370
371	ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
372	if (ret)
373		goto fail;
374
375	ret = jffs2_init_acl_post(inode);
376	if (ret)
377		goto fail;
378
379	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
380				  ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
381	if (ret)
382		goto fail;
383
384	rd = jffs2_alloc_raw_dirent();
385	if (!rd) {
386		/* Argh. Now we treat it like a normal delete */
387		jffs2_complete_reservation(c);
388		ret = -ENOMEM;
389		goto fail;
390	}
391
392	dir_f = JFFS2_INODE_INFO(dir_i);
393	mutex_lock(&dir_f->sem);
394
395	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
396	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
397	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
398	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
399
400	rd->pino = cpu_to_je32(dir_i->i_ino);
401	rd->version = cpu_to_je32(++dir_f->highest_version);
402	rd->ino = cpu_to_je32(inode->i_ino);
403	rd->mctime = cpu_to_je32(JFFS2_NOW());
404	rd->nsize = namelen;
405	rd->type = DT_LNK;
406	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
407	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
408
409	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
410
411	if (IS_ERR(fd)) {
412		/* dirent failed to write. Delete the inode normally
413		   as if it were the final unlink() */
414		jffs2_complete_reservation(c);
415		jffs2_free_raw_dirent(rd);
416		mutex_unlock(&dir_f->sem);
417		ret = PTR_ERR(fd);
418		goto fail;
419	}
420
421	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
422
423	jffs2_free_raw_dirent(rd);
424
425	/* Link the fd into the inode's list, obsoleting an old
426	   one if necessary. */
427	jffs2_add_fd_to_list(c, fd, &dir_f->dents);
428
429	mutex_unlock(&dir_f->sem);
430	jffs2_complete_reservation(c);
431
432	d_instantiate_new(dentry, inode);
 
433	return 0;
434
435 fail:
436	iget_failed(inode);
437	return ret;
438}
439
440
441static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode)
442{
443	struct jffs2_inode_info *f, *dir_f;
444	struct jffs2_sb_info *c;
445	struct inode *inode;
446	struct jffs2_raw_inode *ri;
447	struct jffs2_raw_dirent *rd;
448	struct jffs2_full_dnode *fn;
449	struct jffs2_full_dirent *fd;
450	int namelen;
451	uint32_t alloclen;
452	int ret;
453
454	mode |= S_IFDIR;
455
456	ri = jffs2_alloc_raw_inode();
457	if (!ri)
458		return -ENOMEM;
459
460	c = JFFS2_SB_INFO(dir_i->i_sb);
461
462	/* Try to reserve enough space for both node and dirent.
463	 * Just the node will do for now, though
464	 */
465	namelen = dentry->d_name.len;
466	ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
467				  JFFS2_SUMMARY_INODE_SIZE);
468
469	if (ret) {
470		jffs2_free_raw_inode(ri);
471		return ret;
472	}
473
474	inode = jffs2_new_inode(dir_i, mode, ri);
475
476	if (IS_ERR(inode)) {
477		jffs2_free_raw_inode(ri);
478		jffs2_complete_reservation(c);
479		return PTR_ERR(inode);
480	}
481
482	inode->i_op = &jffs2_dir_inode_operations;
483	inode->i_fop = &jffs2_dir_operations;
484
485	f = JFFS2_INODE_INFO(inode);
486
487	/* Directories get nlink 2 at start */
488	set_nlink(inode, 2);
489	/* but ic->pino_nlink is the parent ino# */
490	f->inocache->pino_nlink = dir_i->i_ino;
491
492	ri->data_crc = cpu_to_je32(0);
493	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
494
495	fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
496
497	jffs2_free_raw_inode(ri);
498
499	if (IS_ERR(fn)) {
500		/* Eeek. Wave bye bye */
501		mutex_unlock(&f->sem);
502		jffs2_complete_reservation(c);
503		ret = PTR_ERR(fn);
504		goto fail;
505	}
506	/* No data here. Only a metadata node, which will be
507	   obsoleted by the first data write
508	*/
509	f->metadata = fn;
510	mutex_unlock(&f->sem);
511
512	jffs2_complete_reservation(c);
513
514	ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
515	if (ret)
516		goto fail;
517
518	ret = jffs2_init_acl_post(inode);
519	if (ret)
520		goto fail;
521
522	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
523				  ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
524	if (ret)
525		goto fail;
526
527	rd = jffs2_alloc_raw_dirent();
528	if (!rd) {
529		/* Argh. Now we treat it like a normal delete */
530		jffs2_complete_reservation(c);
531		ret = -ENOMEM;
532		goto fail;
533	}
534
535	dir_f = JFFS2_INODE_INFO(dir_i);
536	mutex_lock(&dir_f->sem);
537
538	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
539	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
540	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
541	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
542
543	rd->pino = cpu_to_je32(dir_i->i_ino);
544	rd->version = cpu_to_je32(++dir_f->highest_version);
545	rd->ino = cpu_to_je32(inode->i_ino);
546	rd->mctime = cpu_to_je32(JFFS2_NOW());
547	rd->nsize = namelen;
548	rd->type = DT_DIR;
549	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
550	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
551
552	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
553
554	if (IS_ERR(fd)) {
555		/* dirent failed to write. Delete the inode normally
556		   as if it were the final unlink() */
557		jffs2_complete_reservation(c);
558		jffs2_free_raw_dirent(rd);
559		mutex_unlock(&dir_f->sem);
560		ret = PTR_ERR(fd);
561		goto fail;
562	}
563
564	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
565	inc_nlink(dir_i);
566
567	jffs2_free_raw_dirent(rd);
568
569	/* Link the fd into the inode's list, obsoleting an old
570	   one if necessary. */
571	jffs2_add_fd_to_list(c, fd, &dir_f->dents);
572
573	mutex_unlock(&dir_f->sem);
574	jffs2_complete_reservation(c);
575
576	d_instantiate_new(dentry, inode);
 
577	return 0;
578
579 fail:
580	iget_failed(inode);
581	return ret;
582}
583
584static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
585{
586	struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
587	struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
588	struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry));
589	struct jffs2_full_dirent *fd;
590	int ret;
591	uint32_t now = JFFS2_NOW();
592
593	for (fd = f->dents ; fd; fd = fd->next) {
594		if (fd->ino)
595			return -ENOTEMPTY;
596	}
597
598	ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
599			      dentry->d_name.len, f, now);
600	if (!ret) {
601		dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
602		clear_nlink(d_inode(dentry));
603		drop_nlink(dir_i);
604	}
605	return ret;
606}
607
608static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
609{
610	struct jffs2_inode_info *f, *dir_f;
611	struct jffs2_sb_info *c;
612	struct inode *inode;
613	struct jffs2_raw_inode *ri;
614	struct jffs2_raw_dirent *rd;
615	struct jffs2_full_dnode *fn;
616	struct jffs2_full_dirent *fd;
617	int namelen;
618	union jffs2_device_node dev;
619	int devlen = 0;
620	uint32_t alloclen;
621	int ret;
622
 
 
 
623	ri = jffs2_alloc_raw_inode();
624	if (!ri)
625		return -ENOMEM;
626
627	c = JFFS2_SB_INFO(dir_i->i_sb);
628
629	if (S_ISBLK(mode) || S_ISCHR(mode))
630		devlen = jffs2_encode_dev(&dev, rdev);
631
632	/* Try to reserve enough space for both node and dirent.
633	 * Just the node will do for now, though
634	 */
635	namelen = dentry->d_name.len;
636	ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
637				  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
638
639	if (ret) {
640		jffs2_free_raw_inode(ri);
641		return ret;
642	}
643
644	inode = jffs2_new_inode(dir_i, mode, ri);
645
646	if (IS_ERR(inode)) {
647		jffs2_free_raw_inode(ri);
648		jffs2_complete_reservation(c);
649		return PTR_ERR(inode);
650	}
651	inode->i_op = &jffs2_file_inode_operations;
652	init_special_inode(inode, inode->i_mode, rdev);
653
654	f = JFFS2_INODE_INFO(inode);
655
656	ri->dsize = ri->csize = cpu_to_je32(devlen);
657	ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
658	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
659
660	ri->compr = JFFS2_COMPR_NONE;
661	ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
662	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
663
664	fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
665
666	jffs2_free_raw_inode(ri);
667
668	if (IS_ERR(fn)) {
669		/* Eeek. Wave bye bye */
670		mutex_unlock(&f->sem);
671		jffs2_complete_reservation(c);
672		ret = PTR_ERR(fn);
673		goto fail;
674	}
675	/* No data here. Only a metadata node, which will be
676	   obsoleted by the first data write
677	*/
678	f->metadata = fn;
679	mutex_unlock(&f->sem);
680
681	jffs2_complete_reservation(c);
682
683	ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
684	if (ret)
685		goto fail;
686
687	ret = jffs2_init_acl_post(inode);
688	if (ret)
689		goto fail;
690
691	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
692				  ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
693	if (ret)
694		goto fail;
695
696	rd = jffs2_alloc_raw_dirent();
697	if (!rd) {
698		/* Argh. Now we treat it like a normal delete */
699		jffs2_complete_reservation(c);
700		ret = -ENOMEM;
701		goto fail;
702	}
703
704	dir_f = JFFS2_INODE_INFO(dir_i);
705	mutex_lock(&dir_f->sem);
706
707	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
708	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
709	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
710	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
711
712	rd->pino = cpu_to_je32(dir_i->i_ino);
713	rd->version = cpu_to_je32(++dir_f->highest_version);
714	rd->ino = cpu_to_je32(inode->i_ino);
715	rd->mctime = cpu_to_je32(JFFS2_NOW());
716	rd->nsize = namelen;
717
718	/* XXX: This is ugly. */
719	rd->type = (mode & S_IFMT) >> 12;
720
721	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
722	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
723
724	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
725
726	if (IS_ERR(fd)) {
727		/* dirent failed to write. Delete the inode normally
728		   as if it were the final unlink() */
729		jffs2_complete_reservation(c);
730		jffs2_free_raw_dirent(rd);
731		mutex_unlock(&dir_f->sem);
732		ret = PTR_ERR(fd);
733		goto fail;
734	}
735
736	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
737
738	jffs2_free_raw_dirent(rd);
739
740	/* Link the fd into the inode's list, obsoleting an old
741	   one if necessary. */
742	jffs2_add_fd_to_list(c, fd, &dir_f->dents);
743
744	mutex_unlock(&dir_f->sem);
745	jffs2_complete_reservation(c);
746
747	d_instantiate_new(dentry, inode);
 
748	return 0;
749
750 fail:
751	iget_failed(inode);
752	return ret;
753}
754
755static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
756			 struct inode *new_dir_i, struct dentry *new_dentry,
757			 unsigned int flags)
758{
759	int ret;
760	struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
761	struct jffs2_inode_info *victim_f = NULL;
762	uint8_t type;
763	uint32_t now;
764
765	if (flags & ~RENAME_NOREPLACE)
766		return -EINVAL;
767
768	/* The VFS will check for us and prevent trying to rename a
769	 * file over a directory and vice versa, but if it's a directory,
770	 * the VFS can't check whether the victim is empty. The filesystem
771	 * needs to do that for itself.
772	 */
773	if (d_really_is_positive(new_dentry)) {
774		victim_f = JFFS2_INODE_INFO(d_inode(new_dentry));
775		if (d_is_dir(new_dentry)) {
776			struct jffs2_full_dirent *fd;
777
778			mutex_lock(&victim_f->sem);
779			for (fd = victim_f->dents; fd; fd = fd->next) {
780				if (fd->ino) {
781					mutex_unlock(&victim_f->sem);
782					return -ENOTEMPTY;
783				}
784			}
785			mutex_unlock(&victim_f->sem);
786		}
787	}
788
789	/* XXX: We probably ought to alloc enough space for
790	   both nodes at the same time. Writing the new link,
791	   then getting -ENOSPC, is quite bad :)
792	*/
793
794	/* Make a hard link */
795
796	/* XXX: This is ugly */
797	type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
798	if (!type) type = DT_REG;
799
800	now = JFFS2_NOW();
801	ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
802			    d_inode(old_dentry)->i_ino, type,
803			    new_dentry->d_name.name, new_dentry->d_name.len, now);
804
805	if (ret)
806		return ret;
807
808	if (victim_f) {
809		/* There was a victim. Kill it off nicely */
810		if (d_is_dir(new_dentry))
811			clear_nlink(d_inode(new_dentry));
812		else
813			drop_nlink(d_inode(new_dentry));
814		/* Don't oops if the victim was a dirent pointing to an
815		   inode which didn't exist. */
816		if (victim_f->inocache) {
817			mutex_lock(&victim_f->sem);
818			if (d_is_dir(new_dentry))
819				victim_f->inocache->pino_nlink = 0;
820			else
821				victim_f->inocache->pino_nlink--;
822			mutex_unlock(&victim_f->sem);
823		}
824	}
825
826	/* If it was a directory we moved, and there was no victim,
827	   increase i_nlink on its new parent */
828	if (d_is_dir(old_dentry) && !victim_f)
829		inc_nlink(new_dir_i);
830
831	/* Unlink the original */
832	ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
833			      old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
834
835	/* We don't touch inode->i_nlink */
836
837	if (ret) {
838		/* Oh shit. We really ought to make a single node which can do both atomically */
839		struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
840		mutex_lock(&f->sem);
841		inc_nlink(d_inode(old_dentry));
842		if (f->inocache && !d_is_dir(old_dentry))
843			f->inocache->pino_nlink++;
844		mutex_unlock(&f->sem);
845
846		pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
847			  __func__, ret);
848		/*
849		 * We can't keep the target in dcache after that.
850		 * For one thing, we can't afford dentry aliases for directories.
851		 * For another, if there was a victim, we _can't_ set new inode
852		 * for that sucker and we have to trigger mount eviction - the
853		 * caller won't do it on its own since we are returning an error.
854		 */
855		d_invalidate(new_dentry);
856		new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
857		return ret;
858	}
859
860	if (d_is_dir(old_dentry))
861		drop_nlink(old_dir_i);
862
863	new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
864
865	return 0;
866}
867