Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2001-2003 Red Hat, Inc. | |
5 | * | |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
2f0077e0 | 10 | * $Id: fs.c,v 1.66 2005/09/27 13:17:29 dedekind Exp $ |
1da177e4 LT |
11 | * |
12 | */ | |
13 | ||
16f7e0fe | 14 | #include <linux/capability.h> |
1da177e4 LT |
15 | #include <linux/config.h> |
16 | #include <linux/kernel.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/mtd/mtd.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/vmalloc.h> | |
24 | #include <linux/vfs.h> | |
25 | #include <linux/crc32.h> | |
26 | #include "nodelist.h" | |
27 | ||
28 | static int jffs2_flash_setup(struct jffs2_sb_info *c); | |
29 | ||
30 | static int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) | |
31 | { | |
32 | struct jffs2_full_dnode *old_metadata, *new_metadata; | |
33 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
34 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
35 | struct jffs2_raw_inode *ri; | |
36 | unsigned short dev; | |
37 | unsigned char *mdata = NULL; | |
38 | int mdatalen = 0; | |
39 | unsigned int ivalid; | |
40 | uint32_t phys_ofs, alloclen; | |
41 | int ret; | |
42 | D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino)); | |
43 | ret = inode_change_ok(inode, iattr); | |
182ec4ee | 44 | if (ret) |
1da177e4 LT |
45 | return ret; |
46 | ||
47 | /* Special cases - we don't want more than one data node | |
48 | for these types on the medium at any time. So setattr | |
49 | must read the original data associated with the node | |
50 | (i.e. the device numbers or the target name) and write | |
51 | it out again with the appropriate data attached */ | |
52 | if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { | |
53 | /* For these, we don't actually need to read the old node */ | |
54 | dev = old_encode_dev(inode->i_rdev); | |
55 | mdata = (char *)&dev; | |
56 | mdatalen = sizeof(dev); | |
57 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen)); | |
58 | } else if (S_ISLNK(inode->i_mode)) { | |
422138dd | 59 | down(&f->sem); |
1da177e4 LT |
60 | mdatalen = f->metadata->size; |
61 | mdata = kmalloc(f->metadata->size, GFP_USER); | |
422138dd DB |
62 | if (!mdata) { |
63 | up(&f->sem); | |
1da177e4 | 64 | return -ENOMEM; |
422138dd | 65 | } |
1da177e4 LT |
66 | ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); |
67 | if (ret) { | |
422138dd | 68 | up(&f->sem); |
1da177e4 LT |
69 | kfree(mdata); |
70 | return ret; | |
71 | } | |
422138dd | 72 | up(&f->sem); |
1da177e4 LT |
73 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen)); |
74 | } | |
75 | ||
76 | ri = jffs2_alloc_raw_inode(); | |
77 | if (!ri) { | |
78 | if (S_ISLNK(inode->i_mode)) | |
79 | kfree(mdata); | |
80 | return -ENOMEM; | |
81 | } | |
182ec4ee | 82 | |
e631ddba FH |
83 | ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &phys_ofs, &alloclen, |
84 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
85 | if (ret) { |
86 | jffs2_free_raw_inode(ri); | |
87 | if (S_ISLNK(inode->i_mode & S_IFMT)) | |
88 | kfree(mdata); | |
89 | return ret; | |
90 | } | |
91 | down(&f->sem); | |
92 | ivalid = iattr->ia_valid; | |
182ec4ee | 93 | |
1da177e4 LT |
94 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
95 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
96 | ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); | |
97 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
98 | ||
99 | ri->ino = cpu_to_je32(inode->i_ino); | |
100 | ri->version = cpu_to_je32(++f->highest_version); | |
101 | ||
102 | ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid); | |
103 | ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid); | |
104 | ||
105 | if (ivalid & ATTR_MODE) | |
106 | if (iattr->ia_mode & S_ISGID && | |
107 | !in_group_p(je16_to_cpu(ri->gid)) && !capable(CAP_FSETID)) | |
108 | ri->mode = cpu_to_jemode(iattr->ia_mode & ~S_ISGID); | |
182ec4ee | 109 | else |
1da177e4 LT |
110 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
111 | else | |
112 | ri->mode = cpu_to_jemode(inode->i_mode); | |
113 | ||
114 | ||
115 | ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); | |
116 | ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); | |
117 | ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); | |
118 | ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); | |
119 | ||
120 | ri->offset = cpu_to_je32(0); | |
121 | ri->csize = ri->dsize = cpu_to_je32(mdatalen); | |
122 | ri->compr = JFFS2_COMPR_NONE; | |
123 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
124 | /* It's an extension. Make it a hole node */ | |
125 | ri->compr = JFFS2_COMPR_ZERO; | |
126 | ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); | |
127 | ri->offset = cpu_to_je32(inode->i_size); | |
128 | } | |
129 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
130 | if (mdatalen) | |
131 | ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); | |
132 | else | |
133 | ri->data_crc = cpu_to_je32(0); | |
134 | ||
135 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, phys_ofs, ALLOC_NORMAL); | |
136 | if (S_ISLNK(inode->i_mode)) | |
137 | kfree(mdata); | |
182ec4ee | 138 | |
1da177e4 LT |
139 | if (IS_ERR(new_metadata)) { |
140 | jffs2_complete_reservation(c); | |
141 | jffs2_free_raw_inode(ri); | |
142 | up(&f->sem); | |
143 | return PTR_ERR(new_metadata); | |
144 | } | |
145 | /* It worked. Update the inode */ | |
146 | inode->i_atime = ITIME(je32_to_cpu(ri->atime)); | |
147 | inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
148 | inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); | |
149 | inode->i_mode = jemode_to_cpu(ri->mode); | |
150 | inode->i_uid = je16_to_cpu(ri->uid); | |
151 | inode->i_gid = je16_to_cpu(ri->gid); | |
152 | ||
153 | ||
154 | old_metadata = f->metadata; | |
155 | ||
156 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
f302cd02 | 157 | jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
1da177e4 LT |
158 | |
159 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
160 | jffs2_add_full_dnode_to_inode(c, f, new_metadata); | |
161 | inode->i_size = iattr->ia_size; | |
162 | f->metadata = NULL; | |
163 | } else { | |
164 | f->metadata = new_metadata; | |
165 | } | |
166 | if (old_metadata) { | |
167 | jffs2_mark_node_obsolete(c, old_metadata->raw); | |
168 | jffs2_free_full_dnode(old_metadata); | |
169 | } | |
170 | jffs2_free_raw_inode(ri); | |
171 | ||
172 | up(&f->sem); | |
173 | jffs2_complete_reservation(c); | |
174 | ||
175 | /* We have to do the vmtruncate() without f->sem held, since | |
182ec4ee | 176 | some pages may be locked and waiting for it in readpage(). |
1da177e4 LT |
177 | We are protected from a simultaneous write() extending i_size |
178 | back past iattr->ia_size, because do_truncate() holds the | |
179 | generic inode semaphore. */ | |
180 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
181 | vmtruncate(inode, iattr->ia_size); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) | |
187 | { | |
188 | return jffs2_do_setattr(dentry->d_inode, iattr); | |
189 | } | |
190 | ||
191 | int jffs2_statfs(struct super_block *sb, struct kstatfs *buf) | |
192 | { | |
193 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
194 | unsigned long avail; | |
195 | ||
196 | buf->f_type = JFFS2_SUPER_MAGIC; | |
197 | buf->f_bsize = 1 << PAGE_SHIFT; | |
198 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; | |
199 | buf->f_files = 0; | |
200 | buf->f_ffree = 0; | |
201 | buf->f_namelen = JFFS2_MAX_NAME_LEN; | |
202 | ||
203 | spin_lock(&c->erase_completion_lock); | |
1da177e4 LT |
204 | avail = c->dirty_size + c->free_size; |
205 | if (avail > c->sector_size * c->resv_blocks_write) | |
206 | avail -= c->sector_size * c->resv_blocks_write; | |
207 | else | |
208 | avail = 0; | |
e0c8e42f | 209 | spin_unlock(&c->erase_completion_lock); |
1da177e4 LT |
210 | |
211 | buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; | |
212 | ||
1da177e4 LT |
213 | return 0; |
214 | } | |
215 | ||
216 | ||
217 | void jffs2_clear_inode (struct inode *inode) | |
218 | { | |
182ec4ee | 219 | /* We can forget about this inode for now - drop all |
1da177e4 LT |
220 | * the nodelists associated with it, etc. |
221 | */ | |
222 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
223 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
182ec4ee | 224 | |
1da177e4 LT |
225 | D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode)); |
226 | ||
227 | jffs2_do_clear_inode(c, f); | |
228 | } | |
229 | ||
230 | void jffs2_read_inode (struct inode *inode) | |
231 | { | |
232 | struct jffs2_inode_info *f; | |
233 | struct jffs2_sb_info *c; | |
234 | struct jffs2_raw_inode latest_node; | |
235 | int ret; | |
236 | ||
237 | D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino)); | |
238 | ||
239 | f = JFFS2_INODE_INFO(inode); | |
240 | c = JFFS2_SB_INFO(inode->i_sb); | |
241 | ||
242 | jffs2_init_inode_info(f); | |
21eeb7aa | 243 | down(&f->sem); |
182ec4ee | 244 | |
1da177e4 LT |
245 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
246 | ||
247 | if (ret) { | |
248 | make_bad_inode(inode); | |
249 | up(&f->sem); | |
250 | return; | |
251 | } | |
252 | inode->i_mode = jemode_to_cpu(latest_node.mode); | |
253 | inode->i_uid = je16_to_cpu(latest_node.uid); | |
254 | inode->i_gid = je16_to_cpu(latest_node.gid); | |
255 | inode->i_size = je32_to_cpu(latest_node.isize); | |
256 | inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); | |
257 | inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); | |
258 | inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); | |
259 | ||
260 | inode->i_nlink = f->inocache->nlink; | |
261 | ||
262 | inode->i_blksize = PAGE_SIZE; | |
263 | inode->i_blocks = (inode->i_size + 511) >> 9; | |
182ec4ee | 264 | |
1da177e4 LT |
265 | switch (inode->i_mode & S_IFMT) { |
266 | jint16_t rdev; | |
267 | ||
268 | case S_IFLNK: | |
269 | inode->i_op = &jffs2_symlink_inode_operations; | |
270 | break; | |
182ec4ee | 271 | |
1da177e4 LT |
272 | case S_IFDIR: |
273 | { | |
274 | struct jffs2_full_dirent *fd; | |
275 | ||
276 | for (fd=f->dents; fd; fd = fd->next) { | |
277 | if (fd->type == DT_DIR && fd->ino) | |
278 | inode->i_nlink++; | |
279 | } | |
280 | /* and '..' */ | |
281 | inode->i_nlink++; | |
282 | /* Root dir gets i_nlink 3 for some reason */ | |
283 | if (inode->i_ino == 1) | |
284 | inode->i_nlink++; | |
285 | ||
286 | inode->i_op = &jffs2_dir_inode_operations; | |
287 | inode->i_fop = &jffs2_dir_operations; | |
288 | break; | |
289 | } | |
290 | case S_IFREG: | |
291 | inode->i_op = &jffs2_file_inode_operations; | |
292 | inode->i_fop = &jffs2_file_operations; | |
293 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
294 | inode->i_mapping->nrpages = 0; | |
295 | break; | |
296 | ||
297 | case S_IFBLK: | |
298 | case S_IFCHR: | |
299 | /* Read the device numbers from the media */ | |
300 | D1(printk(KERN_DEBUG "Reading device numbers from flash\n")); | |
301 | if (jffs2_read_dnode(c, f, f->metadata, (char *)&rdev, 0, sizeof(rdev)) < 0) { | |
302 | /* Eep */ | |
303 | printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino); | |
304 | up(&f->sem); | |
305 | jffs2_do_clear_inode(c, f); | |
306 | make_bad_inode(inode); | |
307 | return; | |
182ec4ee | 308 | } |
1da177e4 LT |
309 | |
310 | case S_IFSOCK: | |
311 | case S_IFIFO: | |
312 | inode->i_op = &jffs2_file_inode_operations; | |
313 | init_special_inode(inode, inode->i_mode, | |
314 | old_decode_dev((je16_to_cpu(rdev)))); | |
315 | break; | |
316 | ||
317 | default: | |
318 | printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino); | |
319 | } | |
320 | ||
321 | up(&f->sem); | |
322 | ||
323 | D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n")); | |
324 | } | |
325 | ||
326 | void jffs2_dirty_inode(struct inode *inode) | |
327 | { | |
328 | struct iattr iattr; | |
329 | ||
330 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { | |
331 | D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino)); | |
332 | return; | |
333 | } | |
334 | ||
335 | D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino)); | |
336 | ||
337 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; | |
338 | iattr.ia_mode = inode->i_mode; | |
339 | iattr.ia_uid = inode->i_uid; | |
340 | iattr.ia_gid = inode->i_gid; | |
341 | iattr.ia_atime = inode->i_atime; | |
342 | iattr.ia_mtime = inode->i_mtime; | |
343 | iattr.ia_ctime = inode->i_ctime; | |
344 | ||
345 | jffs2_do_setattr(inode, &iattr); | |
346 | } | |
347 | ||
348 | int jffs2_remount_fs (struct super_block *sb, int *flags, char *data) | |
349 | { | |
350 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
351 | ||
352 | if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) | |
353 | return -EROFS; | |
354 | ||
355 | /* We stop if it was running, then restart if it needs to. | |
356 | This also catches the case where it was stopped and this | |
357 | is just a remount to restart it. | |
358 | Flush the writebuffer, if neccecary, else we loose it */ | |
359 | if (!(sb->s_flags & MS_RDONLY)) { | |
360 | jffs2_stop_garbage_collect_thread(c); | |
361 | down(&c->alloc_sem); | |
362 | jffs2_flush_wbuf_pad(c); | |
363 | up(&c->alloc_sem); | |
182ec4ee | 364 | } |
1da177e4 LT |
365 | |
366 | if (!(*flags & MS_RDONLY)) | |
367 | jffs2_start_garbage_collect_thread(c); | |
182ec4ee | 368 | |
1da177e4 LT |
369 | *flags |= MS_NOATIME; |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | void jffs2_write_super (struct super_block *sb) | |
375 | { | |
376 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
377 | sb->s_dirt = 0; | |
378 | ||
379 | if (sb->s_flags & MS_RDONLY) | |
380 | return; | |
381 | ||
382 | D1(printk(KERN_DEBUG "jffs2_write_super()\n")); | |
383 | jffs2_garbage_collect_trigger(c); | |
384 | jffs2_erase_pending_blocks(c, 0); | |
385 | jffs2_flush_wbuf_gc(c, 0); | |
386 | } | |
387 | ||
388 | ||
389 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, | |
390 | fill in the raw_inode while you're at it. */ | |
391 | struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri) | |
392 | { | |
393 | struct inode *inode; | |
394 | struct super_block *sb = dir_i->i_sb; | |
395 | struct jffs2_sb_info *c; | |
396 | struct jffs2_inode_info *f; | |
397 | int ret; | |
398 | ||
399 | D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode)); | |
400 | ||
401 | c = JFFS2_SB_INFO(sb); | |
182ec4ee | 402 | |
1da177e4 | 403 | inode = new_inode(sb); |
182ec4ee | 404 | |
1da177e4 LT |
405 | if (!inode) |
406 | return ERR_PTR(-ENOMEM); | |
407 | ||
408 | f = JFFS2_INODE_INFO(inode); | |
409 | jffs2_init_inode_info(f); | |
21eeb7aa | 410 | down(&f->sem); |
1da177e4 LT |
411 | |
412 | memset(ri, 0, sizeof(*ri)); | |
413 | /* Set OS-specific defaults for new inodes */ | |
414 | ri->uid = cpu_to_je16(current->fsuid); | |
415 | ||
416 | if (dir_i->i_mode & S_ISGID) { | |
417 | ri->gid = cpu_to_je16(dir_i->i_gid); | |
418 | if (S_ISDIR(mode)) | |
419 | mode |= S_ISGID; | |
420 | } else { | |
421 | ri->gid = cpu_to_je16(current->fsgid); | |
422 | } | |
423 | ri->mode = cpu_to_jemode(mode); | |
424 | ret = jffs2_do_new_inode (c, f, mode, ri); | |
425 | if (ret) { | |
426 | make_bad_inode(inode); | |
427 | iput(inode); | |
428 | return ERR_PTR(ret); | |
429 | } | |
430 | inode->i_nlink = 1; | |
431 | inode->i_ino = je32_to_cpu(ri->ino); | |
432 | inode->i_mode = jemode_to_cpu(ri->mode); | |
433 | inode->i_gid = je16_to_cpu(ri->gid); | |
434 | inode->i_uid = je16_to_cpu(ri->uid); | |
435 | inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; | |
436 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); | |
437 | ||
438 | inode->i_blksize = PAGE_SIZE; | |
439 | inode->i_blocks = 0; | |
440 | inode->i_size = 0; | |
441 | ||
442 | insert_inode_hash(inode); | |
443 | ||
444 | return inode; | |
445 | } | |
446 | ||
447 | ||
448 | int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) | |
449 | { | |
450 | struct jffs2_sb_info *c; | |
451 | struct inode *root_i; | |
452 | int ret; | |
453 | size_t blocks; | |
454 | ||
455 | c = JFFS2_SB_INFO(sb); | |
456 | ||
2f82ce1e | 457 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
458 | if (c->mtd->type == MTD_NANDFLASH) { |
459 | printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n"); | |
460 | return -EINVAL; | |
461 | } | |
8f15fd55 AV |
462 | if (c->mtd->type == MTD_DATAFLASH) { |
463 | printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n"); | |
464 | return -EINVAL; | |
465 | } | |
466 | #endif | |
1da177e4 LT |
467 | |
468 | c->flash_size = c->mtd->size; | |
182ec4ee | 469 | c->sector_size = c->mtd->erasesize; |
1da177e4 | 470 | blocks = c->flash_size / c->sector_size; |
1da177e4 LT |
471 | |
472 | /* | |
473 | * Size alignment check | |
474 | */ | |
475 | if ((c->sector_size * blocks) != c->flash_size) { | |
182ec4ee | 476 | c->flash_size = c->sector_size * blocks; |
1da177e4 LT |
477 | printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n", |
478 | c->flash_size / 1024); | |
479 | } | |
480 | ||
1da177e4 LT |
481 | if (c->flash_size < 5*c->sector_size) { |
482 | printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size); | |
483 | return -EINVAL; | |
484 | } | |
485 | ||
486 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); | |
1da177e4 LT |
487 | |
488 | /* NAND (or other bizarre) flash... do setup accordingly */ | |
489 | ret = jffs2_flash_setup(c); | |
490 | if (ret) | |
491 | return ret; | |
492 | ||
493 | c->inocache_list = kmalloc(INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *), GFP_KERNEL); | |
494 | if (!c->inocache_list) { | |
495 | ret = -ENOMEM; | |
496 | goto out_wbuf; | |
497 | } | |
498 | memset(c->inocache_list, 0, INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *)); | |
499 | ||
500 | if ((ret = jffs2_do_mount_fs(c))) | |
501 | goto out_inohash; | |
502 | ||
503 | ret = -EINVAL; | |
504 | ||
505 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n")); | |
506 | root_i = iget(sb, 1); | |
507 | if (is_bad_inode(root_i)) { | |
508 | D1(printk(KERN_WARNING "get root inode failed\n")); | |
6dac02a5 | 509 | goto out_root_i; |
1da177e4 LT |
510 | } |
511 | ||
512 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n")); | |
513 | sb->s_root = d_alloc_root(root_i); | |
514 | if (!sb->s_root) | |
515 | goto out_root_i; | |
516 | ||
1da177e4 | 517 | sb->s_maxbytes = 0xFFFFFFFF; |
1da177e4 LT |
518 | sb->s_blocksize = PAGE_CACHE_SIZE; |
519 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
520 | sb->s_magic = JFFS2_SUPER_MAGIC; | |
521 | if (!(sb->s_flags & MS_RDONLY)) | |
522 | jffs2_start_garbage_collect_thread(c); | |
523 | return 0; | |
524 | ||
525 | out_root_i: | |
526 | iput(root_i); | |
1da177e4 LT |
527 | jffs2_free_ino_caches(c); |
528 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 529 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
530 | vfree(c->blocks); |
531 | else | |
532 | kfree(c->blocks); | |
533 | out_inohash: | |
534 | kfree(c->inocache_list); | |
535 | out_wbuf: | |
536 | jffs2_flash_cleanup(c); | |
537 | ||
538 | return ret; | |
539 | } | |
540 | ||
541 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, | |
542 | struct jffs2_inode_info *f) | |
543 | { | |
544 | iput(OFNI_EDONI_2SFFJ(f)); | |
545 | } | |
546 | ||
547 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, | |
548 | int inum, int nlink) | |
549 | { | |
550 | struct inode *inode; | |
551 | struct jffs2_inode_cache *ic; | |
552 | if (!nlink) { | |
553 | /* The inode has zero nlink but its nodes weren't yet marked | |
182ec4ee | 554 | obsolete. This has to be because we're still waiting for |
1da177e4 LT |
555 | the final (close() and) iput() to happen. |
556 | ||
182ec4ee | 557 | There's a possibility that the final iput() could have |
1da177e4 LT |
558 | happened while we were contemplating. In order to ensure |
559 | that we don't cause a new read_inode() (which would fail) | |
560 | for the inode in question, we use ilookup() in this case | |
561 | instead of iget(). | |
562 | ||
182ec4ee | 563 | The nlink can't _become_ zero at this point because we're |
1da177e4 LT |
564 | holding the alloc_sem, and jffs2_do_unlink() would also |
565 | need that while decrementing nlink on any inode. | |
566 | */ | |
567 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); | |
568 | if (!inode) { | |
569 | D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n", | |
570 | inum)); | |
571 | ||
572 | spin_lock(&c->inocache_lock); | |
573 | ic = jffs2_get_ino_cache(c, inum); | |
574 | if (!ic) { | |
575 | D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum)); | |
576 | spin_unlock(&c->inocache_lock); | |
577 | return NULL; | |
578 | } | |
579 | if (ic->state != INO_STATE_CHECKEDABSENT) { | |
580 | /* Wait for progress. Don't just loop */ | |
581 | D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n", | |
582 | ic->ino, ic->state)); | |
583 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); | |
584 | } else { | |
585 | spin_unlock(&c->inocache_lock); | |
586 | } | |
587 | ||
588 | return NULL; | |
589 | } | |
590 | } else { | |
591 | /* Inode has links to it still; they're not going away because | |
592 | jffs2_do_unlink() would need the alloc_sem and we have it. | |
593 | Just iget() it, and if read_inode() is necessary that's OK. | |
594 | */ | |
595 | inode = iget(OFNI_BS_2SFFJ(c), inum); | |
596 | if (!inode) | |
597 | return ERR_PTR(-ENOMEM); | |
598 | } | |
599 | if (is_bad_inode(inode)) { | |
600 | printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. nlink %d\n", | |
601 | inum, nlink); | |
602 | /* NB. This will happen again. We need to do something appropriate here. */ | |
603 | iput(inode); | |
604 | return ERR_PTR(-EIO); | |
605 | } | |
606 | ||
607 | return JFFS2_INODE_INFO(inode); | |
608 | } | |
609 | ||
182ec4ee TG |
610 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
611 | struct jffs2_inode_info *f, | |
1da177e4 LT |
612 | unsigned long offset, |
613 | unsigned long *priv) | |
614 | { | |
615 | struct inode *inode = OFNI_EDONI_2SFFJ(f); | |
616 | struct page *pg; | |
617 | ||
182ec4ee | 618 | pg = read_cache_page(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
1da177e4 LT |
619 | (void *)jffs2_do_readpage_unlock, inode); |
620 | if (IS_ERR(pg)) | |
621 | return (void *)pg; | |
182ec4ee | 622 | |
1da177e4 LT |
623 | *priv = (unsigned long)pg; |
624 | return kmap(pg); | |
625 | } | |
626 | ||
627 | void jffs2_gc_release_page(struct jffs2_sb_info *c, | |
628 | unsigned char *ptr, | |
629 | unsigned long *priv) | |
630 | { | |
631 | struct page *pg = (void *)*priv; | |
632 | ||
633 | kunmap(pg); | |
634 | page_cache_release(pg); | |
635 | } | |
636 | ||
637 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { | |
638 | int ret = 0; | |
182ec4ee | 639 | |
1da177e4 LT |
640 | if (jffs2_cleanmarker_oob(c)) { |
641 | /* NAND flash... do setup accordingly */ | |
642 | ret = jffs2_nand_flash_setup(c); | |
643 | if (ret) | |
644 | return ret; | |
645 | } | |
646 | ||
647 | /* add setups for other bizarre flashes here... */ | |
648 | if (jffs2_nor_ecc(c)) { | |
649 | ret = jffs2_nor_ecc_flash_setup(c); | |
650 | if (ret) | |
651 | return ret; | |
652 | } | |
182ec4ee | 653 | |
8f15fd55 AV |
654 | /* and Dataflash */ |
655 | if (jffs2_dataflash(c)) { | |
656 | ret = jffs2_dataflash_setup(c); | |
657 | if (ret) | |
658 | return ret; | |
659 | } | |
59da721a NP |
660 | |
661 | /* and Intel "Sibley" flash */ | |
662 | if (jffs2_nor_wbuf_flash(c)) { | |
663 | ret = jffs2_nor_wbuf_flash_setup(c); | |
664 | if (ret) | |
665 | return ret; | |
666 | } | |
667 | ||
1da177e4 LT |
668 | return ret; |
669 | } | |
670 | ||
671 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { | |
672 | ||
673 | if (jffs2_cleanmarker_oob(c)) { | |
674 | jffs2_nand_flash_cleanup(c); | |
675 | } | |
676 | ||
677 | /* add cleanups for other bizarre flashes here... */ | |
678 | if (jffs2_nor_ecc(c)) { | |
679 | jffs2_nor_ecc_flash_cleanup(c); | |
680 | } | |
182ec4ee | 681 | |
8f15fd55 AV |
682 | /* and DataFlash */ |
683 | if (jffs2_dataflash(c)) { | |
684 | jffs2_dataflash_cleanup(c); | |
685 | } | |
59da721a NP |
686 | |
687 | /* and Intel "Sibley" flash */ | |
688 | if (jffs2_nor_wbuf_flash(c)) { | |
689 | jffs2_nor_wbuf_flash_cleanup(c); | |
690 | } | |
1da177e4 | 691 | } |