Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
1da177e4 LT |
5 | * |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
16f7e0fe | 12 | #include <linux/capability.h> |
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/sched.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/mtd/mtd.h> | |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/vfs.h> | |
22 | #include <linux/crc32.h> | |
23 | #include "nodelist.h" | |
24 | ||
25 | static int jffs2_flash_setup(struct jffs2_sb_info *c); | |
26 | ||
9ed437c5 | 27 | int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) |
1da177e4 LT |
28 | { |
29 | struct jffs2_full_dnode *old_metadata, *new_metadata; | |
30 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
31 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
32 | struct jffs2_raw_inode *ri; | |
aef9ab47 | 33 | union jffs2_device_node dev; |
1da177e4 LT |
34 | unsigned char *mdata = NULL; |
35 | int mdatalen = 0; | |
36 | unsigned int ivalid; | |
9fe4854c | 37 | uint32_t alloclen; |
1da177e4 | 38 | int ret; |
9ed437c5 | 39 | |
1da177e4 | 40 | D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino)); |
1da177e4 LT |
41 | |
42 | /* Special cases - we don't want more than one data node | |
43 | for these types on the medium at any time. So setattr | |
44 | must read the original data associated with the node | |
45 | (i.e. the device numbers or the target name) and write | |
46 | it out again with the appropriate data attached */ | |
47 | if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { | |
48 | /* For these, we don't actually need to read the old node */ | |
aef9ab47 | 49 | mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); |
1da177e4 | 50 | mdata = (char *)&dev; |
1da177e4 LT |
51 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen)); |
52 | } else if (S_ISLNK(inode->i_mode)) { | |
422138dd | 53 | down(&f->sem); |
1da177e4 LT |
54 | mdatalen = f->metadata->size; |
55 | mdata = kmalloc(f->metadata->size, GFP_USER); | |
422138dd DB |
56 | if (!mdata) { |
57 | up(&f->sem); | |
1da177e4 | 58 | return -ENOMEM; |
422138dd | 59 | } |
1da177e4 LT |
60 | ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); |
61 | if (ret) { | |
422138dd | 62 | up(&f->sem); |
1da177e4 LT |
63 | kfree(mdata); |
64 | return ret; | |
65 | } | |
422138dd | 66 | up(&f->sem); |
1da177e4 LT |
67 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen)); |
68 | } | |
69 | ||
70 | ri = jffs2_alloc_raw_inode(); | |
71 | if (!ri) { | |
72 | if (S_ISLNK(inode->i_mode)) | |
73 | kfree(mdata); | |
74 | return -ENOMEM; | |
75 | } | |
182ec4ee | 76 | |
9fe4854c DW |
77 | ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, |
78 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
79 | if (ret) { |
80 | jffs2_free_raw_inode(ri); | |
81 | if (S_ISLNK(inode->i_mode & S_IFMT)) | |
82 | kfree(mdata); | |
83 | return ret; | |
84 | } | |
85 | down(&f->sem); | |
86 | ivalid = iattr->ia_valid; | |
182ec4ee | 87 | |
1da177e4 LT |
88 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
89 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
90 | ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); | |
91 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
92 | ||
93 | ri->ino = cpu_to_je32(inode->i_ino); | |
94 | ri->version = cpu_to_je32(++f->highest_version); | |
95 | ||
96 | ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid); | |
97 | ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid); | |
98 | ||
99 | if (ivalid & ATTR_MODE) | |
100 | if (iattr->ia_mode & S_ISGID && | |
101 | !in_group_p(je16_to_cpu(ri->gid)) && !capable(CAP_FSETID)) | |
102 | ri->mode = cpu_to_jemode(iattr->ia_mode & ~S_ISGID); | |
182ec4ee | 103 | else |
1da177e4 LT |
104 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
105 | else | |
106 | ri->mode = cpu_to_jemode(inode->i_mode); | |
107 | ||
108 | ||
109 | ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); | |
110 | ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); | |
111 | ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); | |
112 | ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); | |
113 | ||
114 | ri->offset = cpu_to_je32(0); | |
115 | ri->csize = ri->dsize = cpu_to_je32(mdatalen); | |
116 | ri->compr = JFFS2_COMPR_NONE; | |
117 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
118 | /* It's an extension. Make it a hole node */ | |
119 | ri->compr = JFFS2_COMPR_ZERO; | |
120 | ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); | |
121 | ri->offset = cpu_to_je32(inode->i_size); | |
122 | } | |
123 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
124 | if (mdatalen) | |
125 | ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); | |
126 | else | |
127 | ri->data_crc = cpu_to_je32(0); | |
128 | ||
9fe4854c | 129 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, ALLOC_NORMAL); |
1da177e4 LT |
130 | if (S_ISLNK(inode->i_mode)) |
131 | kfree(mdata); | |
182ec4ee | 132 | |
1da177e4 LT |
133 | if (IS_ERR(new_metadata)) { |
134 | jffs2_complete_reservation(c); | |
135 | jffs2_free_raw_inode(ri); | |
136 | up(&f->sem); | |
137 | return PTR_ERR(new_metadata); | |
138 | } | |
139 | /* It worked. Update the inode */ | |
140 | inode->i_atime = ITIME(je32_to_cpu(ri->atime)); | |
141 | inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
142 | inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); | |
143 | inode->i_mode = jemode_to_cpu(ri->mode); | |
144 | inode->i_uid = je16_to_cpu(ri->uid); | |
145 | inode->i_gid = je16_to_cpu(ri->gid); | |
146 | ||
147 | ||
148 | old_metadata = f->metadata; | |
149 | ||
150 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
f302cd02 | 151 | jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
1da177e4 LT |
152 | |
153 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
154 | jffs2_add_full_dnode_to_inode(c, f, new_metadata); | |
155 | inode->i_size = iattr->ia_size; | |
156 | f->metadata = NULL; | |
157 | } else { | |
158 | f->metadata = new_metadata; | |
159 | } | |
160 | if (old_metadata) { | |
161 | jffs2_mark_node_obsolete(c, old_metadata->raw); | |
162 | jffs2_free_full_dnode(old_metadata); | |
163 | } | |
164 | jffs2_free_raw_inode(ri); | |
165 | ||
166 | up(&f->sem); | |
167 | jffs2_complete_reservation(c); | |
168 | ||
169 | /* We have to do the vmtruncate() without f->sem held, since | |
182ec4ee | 170 | some pages may be locked and waiting for it in readpage(). |
1da177e4 LT |
171 | We are protected from a simultaneous write() extending i_size |
172 | back past iattr->ia_size, because do_truncate() holds the | |
173 | generic inode semaphore. */ | |
174 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
175 | vmtruncate(inode, iattr->ia_size); | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) | |
181 | { | |
aa98d7cf KK |
182 | int rc; |
183 | ||
9ed437c5 DW |
184 | rc = inode_change_ok(dentry->d_inode, iattr); |
185 | if (rc) | |
186 | return rc; | |
187 | ||
aa98d7cf KK |
188 | rc = jffs2_do_setattr(dentry->d_inode, iattr); |
189 | if (!rc && (iattr->ia_valid & ATTR_MODE)) | |
190 | rc = jffs2_acl_chmod(dentry->d_inode); | |
9ed437c5 | 191 | |
aa98d7cf | 192 | return rc; |
1da177e4 LT |
193 | } |
194 | ||
726c3342 | 195 | int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 196 | { |
726c3342 | 197 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
1da177e4 LT |
198 | unsigned long avail; |
199 | ||
200 | buf->f_type = JFFS2_SUPER_MAGIC; | |
201 | buf->f_bsize = 1 << PAGE_SHIFT; | |
202 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; | |
203 | buf->f_files = 0; | |
204 | buf->f_ffree = 0; | |
205 | buf->f_namelen = JFFS2_MAX_NAME_LEN; | |
206 | ||
207 | spin_lock(&c->erase_completion_lock); | |
1da177e4 LT |
208 | avail = c->dirty_size + c->free_size; |
209 | if (avail > c->sector_size * c->resv_blocks_write) | |
210 | avail -= c->sector_size * c->resv_blocks_write; | |
211 | else | |
212 | avail = 0; | |
e0c8e42f | 213 | spin_unlock(&c->erase_completion_lock); |
1da177e4 LT |
214 | |
215 | buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; | |
216 | ||
1da177e4 LT |
217 | return 0; |
218 | } | |
219 | ||
220 | ||
221 | void jffs2_clear_inode (struct inode *inode) | |
222 | { | |
182ec4ee | 223 | /* We can forget about this inode for now - drop all |
1da177e4 LT |
224 | * the nodelists associated with it, etc. |
225 | */ | |
226 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
227 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
182ec4ee | 228 | |
1da177e4 | 229 | D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode)); |
1da177e4 LT |
230 | jffs2_do_clear_inode(c, f); |
231 | } | |
232 | ||
5451f79f | 233 | struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
234 | { |
235 | struct jffs2_inode_info *f; | |
236 | struct jffs2_sb_info *c; | |
237 | struct jffs2_raw_inode latest_node; | |
aef9ab47 | 238 | union jffs2_device_node jdev; |
5451f79f | 239 | struct inode *inode; |
aef9ab47 | 240 | dev_t rdev = 0; |
1da177e4 LT |
241 | int ret; |
242 | ||
5451f79f DH |
243 | D1(printk(KERN_DEBUG "jffs2_iget(): ino == %lu\n", ino)); |
244 | ||
245 | inode = iget_locked(sb, ino); | |
246 | if (!inode) | |
247 | return ERR_PTR(-ENOMEM); | |
248 | if (!(inode->i_state & I_NEW)) | |
249 | return inode; | |
1da177e4 LT |
250 | |
251 | f = JFFS2_INODE_INFO(inode); | |
252 | c = JFFS2_SB_INFO(inode->i_sb); | |
253 | ||
254 | jffs2_init_inode_info(f); | |
21eeb7aa | 255 | down(&f->sem); |
182ec4ee | 256 | |
1da177e4 LT |
257 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
258 | ||
259 | if (ret) { | |
1da177e4 | 260 | up(&f->sem); |
5451f79f DH |
261 | iget_failed(inode); |
262 | return ERR_PTR(ret); | |
1da177e4 LT |
263 | } |
264 | inode->i_mode = jemode_to_cpu(latest_node.mode); | |
265 | inode->i_uid = je16_to_cpu(latest_node.uid); | |
266 | inode->i_gid = je16_to_cpu(latest_node.gid); | |
267 | inode->i_size = je32_to_cpu(latest_node.isize); | |
268 | inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); | |
269 | inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); | |
270 | inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); | |
271 | ||
272 | inode->i_nlink = f->inocache->nlink; | |
273 | ||
1da177e4 | 274 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 275 | |
1da177e4 | 276 | switch (inode->i_mode & S_IFMT) { |
1da177e4 LT |
277 | |
278 | case S_IFLNK: | |
279 | inode->i_op = &jffs2_symlink_inode_operations; | |
280 | break; | |
182ec4ee | 281 | |
1da177e4 LT |
282 | case S_IFDIR: |
283 | { | |
284 | struct jffs2_full_dirent *fd; | |
285 | ||
286 | for (fd=f->dents; fd; fd = fd->next) { | |
287 | if (fd->type == DT_DIR && fd->ino) | |
d8c76e6f | 288 | inc_nlink(inode); |
1da177e4 LT |
289 | } |
290 | /* and '..' */ | |
d8c76e6f | 291 | inc_nlink(inode); |
1da177e4 LT |
292 | /* Root dir gets i_nlink 3 for some reason */ |
293 | if (inode->i_ino == 1) | |
d8c76e6f | 294 | inc_nlink(inode); |
1da177e4 LT |
295 | |
296 | inode->i_op = &jffs2_dir_inode_operations; | |
297 | inode->i_fop = &jffs2_dir_operations; | |
298 | break; | |
299 | } | |
300 | case S_IFREG: | |
301 | inode->i_op = &jffs2_file_inode_operations; | |
302 | inode->i_fop = &jffs2_file_operations; | |
303 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
304 | inode->i_mapping->nrpages = 0; | |
305 | break; | |
306 | ||
307 | case S_IFBLK: | |
308 | case S_IFCHR: | |
309 | /* Read the device numbers from the media */ | |
aef9ab47 DW |
310 | if (f->metadata->size != sizeof(jdev.old) && |
311 | f->metadata->size != sizeof(jdev.new)) { | |
312 | printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size); | |
5451f79f | 313 | goto error_io; |
aef9ab47 | 314 | } |
1da177e4 | 315 | D1(printk(KERN_DEBUG "Reading device numbers from flash\n")); |
5451f79f DH |
316 | ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); |
317 | if (ret < 0) { | |
1da177e4 LT |
318 | /* Eep */ |
319 | printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino); | |
5451f79f | 320 | goto error; |
182ec4ee | 321 | } |
aef9ab47 DW |
322 | if (f->metadata->size == sizeof(jdev.old)) |
323 | rdev = old_decode_dev(je16_to_cpu(jdev.old)); | |
324 | else | |
325 | rdev = new_decode_dev(je32_to_cpu(jdev.new)); | |
1da177e4 LT |
326 | |
327 | case S_IFSOCK: | |
328 | case S_IFIFO: | |
329 | inode->i_op = &jffs2_file_inode_operations; | |
aef9ab47 | 330 | init_special_inode(inode, inode->i_mode, rdev); |
1da177e4 LT |
331 | break; |
332 | ||
333 | default: | |
334 | printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino); | |
335 | } | |
336 | ||
337 | up(&f->sem); | |
338 | ||
339 | D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n")); | |
5451f79f DH |
340 | unlock_new_inode(inode); |
341 | return inode; | |
342 | ||
343 | error_io: | |
344 | ret = -EIO; | |
345 | error: | |
346 | up(&f->sem); | |
347 | jffs2_do_clear_inode(c, f); | |
348 | iget_failed(inode); | |
349 | return ERR_PTR(ret); | |
1da177e4 LT |
350 | } |
351 | ||
352 | void jffs2_dirty_inode(struct inode *inode) | |
353 | { | |
354 | struct iattr iattr; | |
355 | ||
356 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { | |
357 | D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino)); | |
358 | return; | |
359 | } | |
360 | ||
361 | D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino)); | |
362 | ||
363 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; | |
364 | iattr.ia_mode = inode->i_mode; | |
365 | iattr.ia_uid = inode->i_uid; | |
366 | iattr.ia_gid = inode->i_gid; | |
367 | iattr.ia_atime = inode->i_atime; | |
368 | iattr.ia_mtime = inode->i_mtime; | |
369 | iattr.ia_ctime = inode->i_ctime; | |
370 | ||
371 | jffs2_do_setattr(inode, &iattr); | |
372 | } | |
373 | ||
374 | int jffs2_remount_fs (struct super_block *sb, int *flags, char *data) | |
375 | { | |
376 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
377 | ||
378 | if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) | |
379 | return -EROFS; | |
380 | ||
381 | /* We stop if it was running, then restart if it needs to. | |
382 | This also catches the case where it was stopped and this | |
383 | is just a remount to restart it. | |
384 | Flush the writebuffer, if neccecary, else we loose it */ | |
385 | if (!(sb->s_flags & MS_RDONLY)) { | |
386 | jffs2_stop_garbage_collect_thread(c); | |
387 | down(&c->alloc_sem); | |
388 | jffs2_flush_wbuf_pad(c); | |
389 | up(&c->alloc_sem); | |
182ec4ee | 390 | } |
1da177e4 LT |
391 | |
392 | if (!(*flags & MS_RDONLY)) | |
393 | jffs2_start_garbage_collect_thread(c); | |
182ec4ee | 394 | |
1da177e4 LT |
395 | *flags |= MS_NOATIME; |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | void jffs2_write_super (struct super_block *sb) | |
401 | { | |
402 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
403 | sb->s_dirt = 0; | |
404 | ||
405 | if (sb->s_flags & MS_RDONLY) | |
406 | return; | |
407 | ||
408 | D1(printk(KERN_DEBUG "jffs2_write_super()\n")); | |
409 | jffs2_garbage_collect_trigger(c); | |
410 | jffs2_erase_pending_blocks(c, 0); | |
411 | jffs2_flush_wbuf_gc(c, 0); | |
412 | } | |
413 | ||
414 | ||
415 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, | |
416 | fill in the raw_inode while you're at it. */ | |
cfc8dc6f | 417 | struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri) |
1da177e4 LT |
418 | { |
419 | struct inode *inode; | |
420 | struct super_block *sb = dir_i->i_sb; | |
421 | struct jffs2_sb_info *c; | |
422 | struct jffs2_inode_info *f; | |
423 | int ret; | |
424 | ||
425 | D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode)); | |
426 | ||
427 | c = JFFS2_SB_INFO(sb); | |
182ec4ee | 428 | |
1da177e4 | 429 | inode = new_inode(sb); |
182ec4ee | 430 | |
1da177e4 LT |
431 | if (!inode) |
432 | return ERR_PTR(-ENOMEM); | |
433 | ||
434 | f = JFFS2_INODE_INFO(inode); | |
435 | jffs2_init_inode_info(f); | |
21eeb7aa | 436 | down(&f->sem); |
1da177e4 LT |
437 | |
438 | memset(ri, 0, sizeof(*ri)); | |
439 | /* Set OS-specific defaults for new inodes */ | |
440 | ri->uid = cpu_to_je16(current->fsuid); | |
441 | ||
442 | if (dir_i->i_mode & S_ISGID) { | |
443 | ri->gid = cpu_to_je16(dir_i->i_gid); | |
444 | if (S_ISDIR(mode)) | |
445 | mode |= S_ISGID; | |
446 | } else { | |
447 | ri->gid = cpu_to_je16(current->fsgid); | |
448 | } | |
9ed437c5 DW |
449 | |
450 | /* POSIX ACLs have to be processed now, at least partly. | |
451 | The umask is only applied if there's no default ACL */ | |
cfc8dc6f KK |
452 | ret = jffs2_init_acl_pre(dir_i, inode, &mode); |
453 | if (ret) { | |
454 | make_bad_inode(inode); | |
455 | iput(inode); | |
456 | return ERR_PTR(ret); | |
9ed437c5 | 457 | } |
1da177e4 LT |
458 | ret = jffs2_do_new_inode (c, f, mode, ri); |
459 | if (ret) { | |
460 | make_bad_inode(inode); | |
461 | iput(inode); | |
462 | return ERR_PTR(ret); | |
463 | } | |
464 | inode->i_nlink = 1; | |
465 | inode->i_ino = je32_to_cpu(ri->ino); | |
466 | inode->i_mode = jemode_to_cpu(ri->mode); | |
467 | inode->i_gid = je16_to_cpu(ri->gid); | |
468 | inode->i_uid = je16_to_cpu(ri->uid); | |
469 | inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; | |
470 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); | |
471 | ||
1da177e4 LT |
472 | inode->i_blocks = 0; |
473 | inode->i_size = 0; | |
474 | ||
475 | insert_inode_hash(inode); | |
476 | ||
477 | return inode; | |
478 | } | |
479 | ||
480 | ||
481 | int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) | |
482 | { | |
483 | struct jffs2_sb_info *c; | |
484 | struct inode *root_i; | |
485 | int ret; | |
486 | size_t blocks; | |
487 | ||
488 | c = JFFS2_SB_INFO(sb); | |
489 | ||
2f82ce1e | 490 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
491 | if (c->mtd->type == MTD_NANDFLASH) { |
492 | printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n"); | |
493 | return -EINVAL; | |
494 | } | |
8f15fd55 AV |
495 | if (c->mtd->type == MTD_DATAFLASH) { |
496 | printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n"); | |
497 | return -EINVAL; | |
498 | } | |
499 | #endif | |
1da177e4 LT |
500 | |
501 | c->flash_size = c->mtd->size; | |
182ec4ee | 502 | c->sector_size = c->mtd->erasesize; |
1da177e4 | 503 | blocks = c->flash_size / c->sector_size; |
1da177e4 LT |
504 | |
505 | /* | |
506 | * Size alignment check | |
507 | */ | |
508 | if ((c->sector_size * blocks) != c->flash_size) { | |
182ec4ee | 509 | c->flash_size = c->sector_size * blocks; |
1da177e4 LT |
510 | printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n", |
511 | c->flash_size / 1024); | |
512 | } | |
513 | ||
1da177e4 LT |
514 | if (c->flash_size < 5*c->sector_size) { |
515 | printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size); | |
516 | return -EINVAL; | |
517 | } | |
518 | ||
519 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); | |
1da177e4 LT |
520 | |
521 | /* NAND (or other bizarre) flash... do setup accordingly */ | |
522 | ret = jffs2_flash_setup(c); | |
523 | if (ret) | |
524 | return ret; | |
525 | ||
3d375d9e | 526 | c->inocache_list = kcalloc(INOCACHE_HASHSIZE, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); |
1da177e4 LT |
527 | if (!c->inocache_list) { |
528 | ret = -ENOMEM; | |
529 | goto out_wbuf; | |
530 | } | |
1da177e4 | 531 | |
aa98d7cf KK |
532 | jffs2_init_xattr_subsystem(c); |
533 | ||
1da177e4 LT |
534 | if ((ret = jffs2_do_mount_fs(c))) |
535 | goto out_inohash; | |
536 | ||
1da177e4 | 537 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n")); |
5451f79f DH |
538 | root_i = jffs2_iget(sb, 1); |
539 | if (IS_ERR(root_i)) { | |
1da177e4 | 540 | D1(printk(KERN_WARNING "get root inode failed\n")); |
5451f79f DH |
541 | ret = PTR_ERR(root_i); |
542 | goto out_root; | |
1da177e4 LT |
543 | } |
544 | ||
5451f79f DH |
545 | ret = -ENOMEM; |
546 | ||
1da177e4 LT |
547 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n")); |
548 | sb->s_root = d_alloc_root(root_i); | |
549 | if (!sb->s_root) | |
550 | goto out_root_i; | |
551 | ||
1da177e4 | 552 | sb->s_maxbytes = 0xFFFFFFFF; |
1da177e4 LT |
553 | sb->s_blocksize = PAGE_CACHE_SIZE; |
554 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
555 | sb->s_magic = JFFS2_SUPER_MAGIC; | |
556 | if (!(sb->s_flags & MS_RDONLY)) | |
557 | jffs2_start_garbage_collect_thread(c); | |
558 | return 0; | |
559 | ||
560 | out_root_i: | |
561 | iput(root_i); | |
5451f79f | 562 | out_root: |
1da177e4 LT |
563 | jffs2_free_ino_caches(c); |
564 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 565 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
566 | vfree(c->blocks); |
567 | else | |
568 | kfree(c->blocks); | |
569 | out_inohash: | |
aa98d7cf | 570 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
571 | kfree(c->inocache_list); |
572 | out_wbuf: | |
573 | jffs2_flash_cleanup(c); | |
574 | ||
575 | return ret; | |
576 | } | |
577 | ||
578 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, | |
579 | struct jffs2_inode_info *f) | |
580 | { | |
581 | iput(OFNI_EDONI_2SFFJ(f)); | |
582 | } | |
583 | ||
584 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, | |
585 | int inum, int nlink) | |
586 | { | |
587 | struct inode *inode; | |
588 | struct jffs2_inode_cache *ic; | |
589 | if (!nlink) { | |
590 | /* The inode has zero nlink but its nodes weren't yet marked | |
182ec4ee | 591 | obsolete. This has to be because we're still waiting for |
1da177e4 LT |
592 | the final (close() and) iput() to happen. |
593 | ||
182ec4ee | 594 | There's a possibility that the final iput() could have |
1da177e4 LT |
595 | happened while we were contemplating. In order to ensure |
596 | that we don't cause a new read_inode() (which would fail) | |
597 | for the inode in question, we use ilookup() in this case | |
598 | instead of iget(). | |
599 | ||
182ec4ee | 600 | The nlink can't _become_ zero at this point because we're |
1da177e4 LT |
601 | holding the alloc_sem, and jffs2_do_unlink() would also |
602 | need that while decrementing nlink on any inode. | |
603 | */ | |
604 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); | |
605 | if (!inode) { | |
606 | D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n", | |
607 | inum)); | |
608 | ||
609 | spin_lock(&c->inocache_lock); | |
610 | ic = jffs2_get_ino_cache(c, inum); | |
611 | if (!ic) { | |
612 | D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum)); | |
613 | spin_unlock(&c->inocache_lock); | |
614 | return NULL; | |
615 | } | |
616 | if (ic->state != INO_STATE_CHECKEDABSENT) { | |
617 | /* Wait for progress. Don't just loop */ | |
618 | D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n", | |
619 | ic->ino, ic->state)); | |
620 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); | |
621 | } else { | |
622 | spin_unlock(&c->inocache_lock); | |
623 | } | |
624 | ||
625 | return NULL; | |
626 | } | |
627 | } else { | |
628 | /* Inode has links to it still; they're not going away because | |
629 | jffs2_do_unlink() would need the alloc_sem and we have it. | |
630 | Just iget() it, and if read_inode() is necessary that's OK. | |
631 | */ | |
5451f79f DH |
632 | inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); |
633 | if (IS_ERR(inode)) | |
634 | return ERR_CAST(inode); | |
1da177e4 LT |
635 | } |
636 | if (is_bad_inode(inode)) { | |
637 | printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. nlink %d\n", | |
638 | inum, nlink); | |
639 | /* NB. This will happen again. We need to do something appropriate here. */ | |
640 | iput(inode); | |
641 | return ERR_PTR(-EIO); | |
642 | } | |
643 | ||
644 | return JFFS2_INODE_INFO(inode); | |
645 | } | |
646 | ||
182ec4ee TG |
647 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
648 | struct jffs2_inode_info *f, | |
1da177e4 LT |
649 | unsigned long offset, |
650 | unsigned long *priv) | |
651 | { | |
652 | struct inode *inode = OFNI_EDONI_2SFFJ(f); | |
653 | struct page *pg; | |
654 | ||
fc0e0197 | 655 | pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
1da177e4 LT |
656 | (void *)jffs2_do_readpage_unlock, inode); |
657 | if (IS_ERR(pg)) | |
658 | return (void *)pg; | |
182ec4ee | 659 | |
1da177e4 LT |
660 | *priv = (unsigned long)pg; |
661 | return kmap(pg); | |
662 | } | |
663 | ||
664 | void jffs2_gc_release_page(struct jffs2_sb_info *c, | |
665 | unsigned char *ptr, | |
666 | unsigned long *priv) | |
667 | { | |
668 | struct page *pg = (void *)*priv; | |
669 | ||
670 | kunmap(pg); | |
671 | page_cache_release(pg); | |
672 | } | |
673 | ||
674 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { | |
675 | int ret = 0; | |
182ec4ee | 676 | |
1da177e4 LT |
677 | if (jffs2_cleanmarker_oob(c)) { |
678 | /* NAND flash... do setup accordingly */ | |
679 | ret = jffs2_nand_flash_setup(c); | |
680 | if (ret) | |
681 | return ret; | |
682 | } | |
683 | ||
8f15fd55 AV |
684 | /* and Dataflash */ |
685 | if (jffs2_dataflash(c)) { | |
686 | ret = jffs2_dataflash_setup(c); | |
687 | if (ret) | |
688 | return ret; | |
689 | } | |
59da721a NP |
690 | |
691 | /* and Intel "Sibley" flash */ | |
692 | if (jffs2_nor_wbuf_flash(c)) { | |
693 | ret = jffs2_nor_wbuf_flash_setup(c); | |
694 | if (ret) | |
695 | return ret; | |
696 | } | |
697 | ||
0029da3b AB |
698 | /* and an UBI volume */ |
699 | if (jffs2_ubivol(c)) { | |
700 | ret = jffs2_ubivol_setup(c); | |
701 | if (ret) | |
702 | return ret; | |
703 | } | |
704 | ||
1da177e4 LT |
705 | return ret; |
706 | } | |
707 | ||
708 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { | |
709 | ||
710 | if (jffs2_cleanmarker_oob(c)) { | |
711 | jffs2_nand_flash_cleanup(c); | |
712 | } | |
713 | ||
8f15fd55 AV |
714 | /* and DataFlash */ |
715 | if (jffs2_dataflash(c)) { | |
716 | jffs2_dataflash_cleanup(c); | |
717 | } | |
59da721a NP |
718 | |
719 | /* and Intel "Sibley" flash */ | |
720 | if (jffs2_nor_wbuf_flash(c)) { | |
721 | jffs2_nor_wbuf_flash_cleanup(c); | |
722 | } | |
0029da3b AB |
723 | |
724 | /* and an UBI volume */ | |
725 | if (jffs2_ubivol(c)) { | |
726 | jffs2_ubivol_cleanup(c); | |
727 | } | |
1da177e4 | 728 | } |