Commit | Line | Data |
---|---|---|
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; | |
aef9ab47 | 36 | union jffs2_device_node dev; |
1da177e4 LT |
37 | unsigned char *mdata = NULL; |
38 | int mdatalen = 0; | |
39 | unsigned int ivalid; | |
9fe4854c | 40 | uint32_t alloclen; |
1da177e4 LT |
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 */ | |
aef9ab47 | 54 | mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); |
1da177e4 | 55 | mdata = (char *)&dev; |
1da177e4 LT |
56 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen)); |
57 | } else if (S_ISLNK(inode->i_mode)) { | |
422138dd | 58 | down(&f->sem); |
1da177e4 LT |
59 | mdatalen = f->metadata->size; |
60 | mdata = kmalloc(f->metadata->size, GFP_USER); | |
422138dd DB |
61 | if (!mdata) { |
62 | up(&f->sem); | |
1da177e4 | 63 | return -ENOMEM; |
422138dd | 64 | } |
1da177e4 LT |
65 | ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); |
66 | if (ret) { | |
422138dd | 67 | up(&f->sem); |
1da177e4 LT |
68 | kfree(mdata); |
69 | return ret; | |
70 | } | |
422138dd | 71 | up(&f->sem); |
1da177e4 LT |
72 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen)); |
73 | } | |
74 | ||
75 | ri = jffs2_alloc_raw_inode(); | |
76 | if (!ri) { | |
77 | if (S_ISLNK(inode->i_mode)) | |
78 | kfree(mdata); | |
79 | return -ENOMEM; | |
80 | } | |
182ec4ee | 81 | |
9fe4854c DW |
82 | ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, |
83 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
84 | if (ret) { |
85 | jffs2_free_raw_inode(ri); | |
86 | if (S_ISLNK(inode->i_mode & S_IFMT)) | |
87 | kfree(mdata); | |
88 | return ret; | |
89 | } | |
90 | down(&f->sem); | |
91 | ivalid = iattr->ia_valid; | |
182ec4ee | 92 | |
1da177e4 LT |
93 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
94 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
95 | ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); | |
96 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
97 | ||
98 | ri->ino = cpu_to_je32(inode->i_ino); | |
99 | ri->version = cpu_to_je32(++f->highest_version); | |
100 | ||
101 | ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid); | |
102 | ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid); | |
103 | ||
104 | if (ivalid & ATTR_MODE) | |
105 | if (iattr->ia_mode & S_ISGID && | |
106 | !in_group_p(je16_to_cpu(ri->gid)) && !capable(CAP_FSETID)) | |
107 | ri->mode = cpu_to_jemode(iattr->ia_mode & ~S_ISGID); | |
182ec4ee | 108 | else |
1da177e4 LT |
109 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
110 | else | |
111 | ri->mode = cpu_to_jemode(inode->i_mode); | |
112 | ||
113 | ||
114 | ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); | |
115 | ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); | |
116 | ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); | |
117 | ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); | |
118 | ||
119 | ri->offset = cpu_to_je32(0); | |
120 | ri->csize = ri->dsize = cpu_to_je32(mdatalen); | |
121 | ri->compr = JFFS2_COMPR_NONE; | |
122 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
123 | /* It's an extension. Make it a hole node */ | |
124 | ri->compr = JFFS2_COMPR_ZERO; | |
125 | ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); | |
126 | ri->offset = cpu_to_je32(inode->i_size); | |
127 | } | |
128 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
129 | if (mdatalen) | |
130 | ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); | |
131 | else | |
132 | ri->data_crc = cpu_to_je32(0); | |
133 | ||
9fe4854c | 134 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, ALLOC_NORMAL); |
1da177e4 LT |
135 | if (S_ISLNK(inode->i_mode)) |
136 | kfree(mdata); | |
182ec4ee | 137 | |
1da177e4 LT |
138 | if (IS_ERR(new_metadata)) { |
139 | jffs2_complete_reservation(c); | |
140 | jffs2_free_raw_inode(ri); | |
141 | up(&f->sem); | |
142 | return PTR_ERR(new_metadata); | |
143 | } | |
144 | /* It worked. Update the inode */ | |
145 | inode->i_atime = ITIME(je32_to_cpu(ri->atime)); | |
146 | inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
147 | inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); | |
148 | inode->i_mode = jemode_to_cpu(ri->mode); | |
149 | inode->i_uid = je16_to_cpu(ri->uid); | |
150 | inode->i_gid = je16_to_cpu(ri->gid); | |
151 | ||
152 | ||
153 | old_metadata = f->metadata; | |
154 | ||
155 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
f302cd02 | 156 | jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
1da177e4 LT |
157 | |
158 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
159 | jffs2_add_full_dnode_to_inode(c, f, new_metadata); | |
160 | inode->i_size = iattr->ia_size; | |
161 | f->metadata = NULL; | |
162 | } else { | |
163 | f->metadata = new_metadata; | |
164 | } | |
165 | if (old_metadata) { | |
166 | jffs2_mark_node_obsolete(c, old_metadata->raw); | |
167 | jffs2_free_full_dnode(old_metadata); | |
168 | } | |
169 | jffs2_free_raw_inode(ri); | |
170 | ||
171 | up(&f->sem); | |
172 | jffs2_complete_reservation(c); | |
173 | ||
174 | /* We have to do the vmtruncate() without f->sem held, since | |
182ec4ee | 175 | some pages may be locked and waiting for it in readpage(). |
1da177e4 LT |
176 | We are protected from a simultaneous write() extending i_size |
177 | back past iattr->ia_size, because do_truncate() holds the | |
178 | generic inode semaphore. */ | |
179 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
180 | vmtruncate(inode, iattr->ia_size); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) | |
186 | { | |
aa98d7cf KK |
187 | int rc; |
188 | ||
189 | rc = jffs2_do_setattr(dentry->d_inode, iattr); | |
190 | if (!rc && (iattr->ia_valid & ATTR_MODE)) | |
191 | rc = jffs2_acl_chmod(dentry->d_inode); | |
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 LT |
229 | D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode)); |
230 | ||
aa98d7cf | 231 | jffs2_xattr_delete_inode(c, f->inocache); |
1da177e4 LT |
232 | jffs2_do_clear_inode(c, f); |
233 | } | |
234 | ||
235 | void jffs2_read_inode (struct inode *inode) | |
236 | { | |
237 | struct jffs2_inode_info *f; | |
238 | struct jffs2_sb_info *c; | |
239 | struct jffs2_raw_inode latest_node; | |
aef9ab47 DW |
240 | union jffs2_device_node jdev; |
241 | dev_t rdev = 0; | |
1da177e4 LT |
242 | int ret; |
243 | ||
244 | D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino)); | |
245 | ||
246 | f = JFFS2_INODE_INFO(inode); | |
247 | c = JFFS2_SB_INFO(inode->i_sb); | |
248 | ||
249 | jffs2_init_inode_info(f); | |
21eeb7aa | 250 | down(&f->sem); |
182ec4ee | 251 | |
1da177e4 LT |
252 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
253 | ||
254 | if (ret) { | |
255 | make_bad_inode(inode); | |
256 | up(&f->sem); | |
257 | return; | |
258 | } | |
259 | inode->i_mode = jemode_to_cpu(latest_node.mode); | |
260 | inode->i_uid = je16_to_cpu(latest_node.uid); | |
261 | inode->i_gid = je16_to_cpu(latest_node.gid); | |
262 | inode->i_size = je32_to_cpu(latest_node.isize); | |
263 | inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); | |
264 | inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); | |
265 | inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); | |
266 | ||
267 | inode->i_nlink = f->inocache->nlink; | |
268 | ||
269 | inode->i_blksize = PAGE_SIZE; | |
270 | inode->i_blocks = (inode->i_size + 511) >> 9; | |
182ec4ee | 271 | |
1da177e4 | 272 | switch (inode->i_mode & S_IFMT) { |
1da177e4 LT |
273 | |
274 | case S_IFLNK: | |
275 | inode->i_op = &jffs2_symlink_inode_operations; | |
276 | break; | |
182ec4ee | 277 | |
1da177e4 LT |
278 | case S_IFDIR: |
279 | { | |
280 | struct jffs2_full_dirent *fd; | |
281 | ||
282 | for (fd=f->dents; fd; fd = fd->next) { | |
283 | if (fd->type == DT_DIR && fd->ino) | |
284 | inode->i_nlink++; | |
285 | } | |
286 | /* and '..' */ | |
287 | inode->i_nlink++; | |
288 | /* Root dir gets i_nlink 3 for some reason */ | |
289 | if (inode->i_ino == 1) | |
290 | inode->i_nlink++; | |
291 | ||
292 | inode->i_op = &jffs2_dir_inode_operations; | |
293 | inode->i_fop = &jffs2_dir_operations; | |
294 | break; | |
295 | } | |
296 | case S_IFREG: | |
297 | inode->i_op = &jffs2_file_inode_operations; | |
298 | inode->i_fop = &jffs2_file_operations; | |
299 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
300 | inode->i_mapping->nrpages = 0; | |
301 | break; | |
302 | ||
303 | case S_IFBLK: | |
304 | case S_IFCHR: | |
305 | /* Read the device numbers from the media */ | |
aef9ab47 DW |
306 | if (f->metadata->size != sizeof(jdev.old) && |
307 | f->metadata->size != sizeof(jdev.new)) { | |
308 | printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size); | |
309 | up(&f->sem); | |
310 | jffs2_do_clear_inode(c, f); | |
311 | make_bad_inode(inode); | |
312 | return; | |
313 | } | |
1da177e4 | 314 | D1(printk(KERN_DEBUG "Reading device numbers from flash\n")); |
aef9ab47 | 315 | if (jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size) < 0) { |
1da177e4 LT |
316 | /* Eep */ |
317 | printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino); | |
318 | up(&f->sem); | |
319 | jffs2_do_clear_inode(c, f); | |
320 | make_bad_inode(inode); | |
321 | return; | |
182ec4ee | 322 | } |
aef9ab47 DW |
323 | if (f->metadata->size == sizeof(jdev.old)) |
324 | rdev = old_decode_dev(je16_to_cpu(jdev.old)); | |
325 | else | |
326 | rdev = new_decode_dev(je32_to_cpu(jdev.new)); | |
1da177e4 LT |
327 | |
328 | case S_IFSOCK: | |
329 | case S_IFIFO: | |
330 | inode->i_op = &jffs2_file_inode_operations; | |
aef9ab47 | 331 | init_special_inode(inode, inode->i_mode, rdev); |
1da177e4 LT |
332 | break; |
333 | ||
334 | default: | |
335 | printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino); | |
336 | } | |
337 | ||
338 | up(&f->sem); | |
339 | ||
340 | D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n")); | |
341 | } | |
342 | ||
343 | void jffs2_dirty_inode(struct inode *inode) | |
344 | { | |
345 | struct iattr iattr; | |
346 | ||
347 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { | |
348 | D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino)); | |
349 | return; | |
350 | } | |
351 | ||
352 | D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino)); | |
353 | ||
354 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; | |
355 | iattr.ia_mode = inode->i_mode; | |
356 | iattr.ia_uid = inode->i_uid; | |
357 | iattr.ia_gid = inode->i_gid; | |
358 | iattr.ia_atime = inode->i_atime; | |
359 | iattr.ia_mtime = inode->i_mtime; | |
360 | iattr.ia_ctime = inode->i_ctime; | |
361 | ||
362 | jffs2_do_setattr(inode, &iattr); | |
363 | } | |
364 | ||
365 | int jffs2_remount_fs (struct super_block *sb, int *flags, char *data) | |
366 | { | |
367 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
368 | ||
369 | if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) | |
370 | return -EROFS; | |
371 | ||
372 | /* We stop if it was running, then restart if it needs to. | |
373 | This also catches the case where it was stopped and this | |
374 | is just a remount to restart it. | |
375 | Flush the writebuffer, if neccecary, else we loose it */ | |
376 | if (!(sb->s_flags & MS_RDONLY)) { | |
377 | jffs2_stop_garbage_collect_thread(c); | |
378 | down(&c->alloc_sem); | |
379 | jffs2_flush_wbuf_pad(c); | |
380 | up(&c->alloc_sem); | |
182ec4ee | 381 | } |
1da177e4 LT |
382 | |
383 | if (!(*flags & MS_RDONLY)) | |
384 | jffs2_start_garbage_collect_thread(c); | |
182ec4ee | 385 | |
1da177e4 LT |
386 | *flags |= MS_NOATIME; |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | void jffs2_write_super (struct super_block *sb) | |
392 | { | |
393 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
394 | sb->s_dirt = 0; | |
395 | ||
396 | if (sb->s_flags & MS_RDONLY) | |
397 | return; | |
398 | ||
399 | D1(printk(KERN_DEBUG "jffs2_write_super()\n")); | |
400 | jffs2_garbage_collect_trigger(c); | |
401 | jffs2_erase_pending_blocks(c, 0); | |
402 | jffs2_flush_wbuf_gc(c, 0); | |
403 | } | |
404 | ||
405 | ||
406 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, | |
407 | fill in the raw_inode while you're at it. */ | |
408 | struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri) | |
409 | { | |
410 | struct inode *inode; | |
411 | struct super_block *sb = dir_i->i_sb; | |
412 | struct jffs2_sb_info *c; | |
413 | struct jffs2_inode_info *f; | |
414 | int ret; | |
415 | ||
416 | D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode)); | |
417 | ||
418 | c = JFFS2_SB_INFO(sb); | |
182ec4ee | 419 | |
1da177e4 | 420 | inode = new_inode(sb); |
182ec4ee | 421 | |
1da177e4 LT |
422 | if (!inode) |
423 | return ERR_PTR(-ENOMEM); | |
424 | ||
425 | f = JFFS2_INODE_INFO(inode); | |
426 | jffs2_init_inode_info(f); | |
21eeb7aa | 427 | down(&f->sem); |
1da177e4 LT |
428 | |
429 | memset(ri, 0, sizeof(*ri)); | |
430 | /* Set OS-specific defaults for new inodes */ | |
431 | ri->uid = cpu_to_je16(current->fsuid); | |
432 | ||
433 | if (dir_i->i_mode & S_ISGID) { | |
434 | ri->gid = cpu_to_je16(dir_i->i_gid); | |
435 | if (S_ISDIR(mode)) | |
436 | mode |= S_ISGID; | |
437 | } else { | |
438 | ri->gid = cpu_to_je16(current->fsgid); | |
439 | } | |
440 | ri->mode = cpu_to_jemode(mode); | |
441 | ret = jffs2_do_new_inode (c, f, mode, ri); | |
442 | if (ret) { | |
443 | make_bad_inode(inode); | |
444 | iput(inode); | |
445 | return ERR_PTR(ret); | |
446 | } | |
447 | inode->i_nlink = 1; | |
448 | inode->i_ino = je32_to_cpu(ri->ino); | |
449 | inode->i_mode = jemode_to_cpu(ri->mode); | |
450 | inode->i_gid = je16_to_cpu(ri->gid); | |
451 | inode->i_uid = je16_to_cpu(ri->uid); | |
452 | inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; | |
453 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); | |
454 | ||
455 | inode->i_blksize = PAGE_SIZE; | |
456 | inode->i_blocks = 0; | |
457 | inode->i_size = 0; | |
458 | ||
459 | insert_inode_hash(inode); | |
460 | ||
461 | return inode; | |
462 | } | |
463 | ||
464 | ||
465 | int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) | |
466 | { | |
467 | struct jffs2_sb_info *c; | |
468 | struct inode *root_i; | |
469 | int ret; | |
470 | size_t blocks; | |
471 | ||
472 | c = JFFS2_SB_INFO(sb); | |
473 | ||
2f82ce1e | 474 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
475 | if (c->mtd->type == MTD_NANDFLASH) { |
476 | printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n"); | |
477 | return -EINVAL; | |
478 | } | |
8f15fd55 AV |
479 | if (c->mtd->type == MTD_DATAFLASH) { |
480 | printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n"); | |
481 | return -EINVAL; | |
482 | } | |
483 | #endif | |
1da177e4 LT |
484 | |
485 | c->flash_size = c->mtd->size; | |
182ec4ee | 486 | c->sector_size = c->mtd->erasesize; |
1da177e4 | 487 | blocks = c->flash_size / c->sector_size; |
1da177e4 LT |
488 | |
489 | /* | |
490 | * Size alignment check | |
491 | */ | |
492 | if ((c->sector_size * blocks) != c->flash_size) { | |
182ec4ee | 493 | c->flash_size = c->sector_size * blocks; |
1da177e4 LT |
494 | printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n", |
495 | c->flash_size / 1024); | |
496 | } | |
497 | ||
1da177e4 LT |
498 | if (c->flash_size < 5*c->sector_size) { |
499 | printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size); | |
500 | return -EINVAL; | |
501 | } | |
502 | ||
503 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); | |
1da177e4 LT |
504 | |
505 | /* NAND (or other bizarre) flash... do setup accordingly */ | |
506 | ret = jffs2_flash_setup(c); | |
507 | if (ret) | |
508 | return ret; | |
509 | ||
510 | c->inocache_list = kmalloc(INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *), GFP_KERNEL); | |
511 | if (!c->inocache_list) { | |
512 | ret = -ENOMEM; | |
513 | goto out_wbuf; | |
514 | } | |
515 | memset(c->inocache_list, 0, INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *)); | |
516 | ||
aa98d7cf KK |
517 | jffs2_init_xattr_subsystem(c); |
518 | ||
1da177e4 LT |
519 | if ((ret = jffs2_do_mount_fs(c))) |
520 | goto out_inohash; | |
521 | ||
522 | ret = -EINVAL; | |
523 | ||
524 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n")); | |
525 | root_i = iget(sb, 1); | |
526 | if (is_bad_inode(root_i)) { | |
527 | D1(printk(KERN_WARNING "get root inode failed\n")); | |
6dac02a5 | 528 | goto out_root_i; |
1da177e4 LT |
529 | } |
530 | ||
531 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n")); | |
532 | sb->s_root = d_alloc_root(root_i); | |
533 | if (!sb->s_root) | |
534 | goto out_root_i; | |
535 | ||
1da177e4 | 536 | sb->s_maxbytes = 0xFFFFFFFF; |
1da177e4 LT |
537 | sb->s_blocksize = PAGE_CACHE_SIZE; |
538 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
539 | sb->s_magic = JFFS2_SUPER_MAGIC; | |
540 | if (!(sb->s_flags & MS_RDONLY)) | |
541 | jffs2_start_garbage_collect_thread(c); | |
542 | return 0; | |
543 | ||
544 | out_root_i: | |
545 | iput(root_i); | |
1da177e4 LT |
546 | jffs2_free_ino_caches(c); |
547 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 548 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
549 | vfree(c->blocks); |
550 | else | |
551 | kfree(c->blocks); | |
552 | out_inohash: | |
aa98d7cf | 553 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
554 | kfree(c->inocache_list); |
555 | out_wbuf: | |
556 | jffs2_flash_cleanup(c); | |
557 | ||
558 | return ret; | |
559 | } | |
560 | ||
561 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, | |
562 | struct jffs2_inode_info *f) | |
563 | { | |
564 | iput(OFNI_EDONI_2SFFJ(f)); | |
565 | } | |
566 | ||
567 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, | |
568 | int inum, int nlink) | |
569 | { | |
570 | struct inode *inode; | |
571 | struct jffs2_inode_cache *ic; | |
572 | if (!nlink) { | |
573 | /* The inode has zero nlink but its nodes weren't yet marked | |
182ec4ee | 574 | obsolete. This has to be because we're still waiting for |
1da177e4 LT |
575 | the final (close() and) iput() to happen. |
576 | ||
182ec4ee | 577 | There's a possibility that the final iput() could have |
1da177e4 LT |
578 | happened while we were contemplating. In order to ensure |
579 | that we don't cause a new read_inode() (which would fail) | |
580 | for the inode in question, we use ilookup() in this case | |
581 | instead of iget(). | |
582 | ||
182ec4ee | 583 | The nlink can't _become_ zero at this point because we're |
1da177e4 LT |
584 | holding the alloc_sem, and jffs2_do_unlink() would also |
585 | need that while decrementing nlink on any inode. | |
586 | */ | |
587 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); | |
588 | if (!inode) { | |
589 | D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n", | |
590 | inum)); | |
591 | ||
592 | spin_lock(&c->inocache_lock); | |
593 | ic = jffs2_get_ino_cache(c, inum); | |
594 | if (!ic) { | |
595 | D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum)); | |
596 | spin_unlock(&c->inocache_lock); | |
597 | return NULL; | |
598 | } | |
599 | if (ic->state != INO_STATE_CHECKEDABSENT) { | |
600 | /* Wait for progress. Don't just loop */ | |
601 | D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n", | |
602 | ic->ino, ic->state)); | |
603 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); | |
604 | } else { | |
605 | spin_unlock(&c->inocache_lock); | |
606 | } | |
607 | ||
608 | return NULL; | |
609 | } | |
610 | } else { | |
611 | /* Inode has links to it still; they're not going away because | |
612 | jffs2_do_unlink() would need the alloc_sem and we have it. | |
613 | Just iget() it, and if read_inode() is necessary that's OK. | |
614 | */ | |
615 | inode = iget(OFNI_BS_2SFFJ(c), inum); | |
616 | if (!inode) | |
617 | return ERR_PTR(-ENOMEM); | |
618 | } | |
619 | if (is_bad_inode(inode)) { | |
620 | printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. nlink %d\n", | |
621 | inum, nlink); | |
622 | /* NB. This will happen again. We need to do something appropriate here. */ | |
623 | iput(inode); | |
624 | return ERR_PTR(-EIO); | |
625 | } | |
626 | ||
627 | return JFFS2_INODE_INFO(inode); | |
628 | } | |
629 | ||
182ec4ee TG |
630 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
631 | struct jffs2_inode_info *f, | |
1da177e4 LT |
632 | unsigned long offset, |
633 | unsigned long *priv) | |
634 | { | |
635 | struct inode *inode = OFNI_EDONI_2SFFJ(f); | |
636 | struct page *pg; | |
637 | ||
182ec4ee | 638 | pg = read_cache_page(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
1da177e4 LT |
639 | (void *)jffs2_do_readpage_unlock, inode); |
640 | if (IS_ERR(pg)) | |
641 | return (void *)pg; | |
182ec4ee | 642 | |
1da177e4 LT |
643 | *priv = (unsigned long)pg; |
644 | return kmap(pg); | |
645 | } | |
646 | ||
647 | void jffs2_gc_release_page(struct jffs2_sb_info *c, | |
648 | unsigned char *ptr, | |
649 | unsigned long *priv) | |
650 | { | |
651 | struct page *pg = (void *)*priv; | |
652 | ||
653 | kunmap(pg); | |
654 | page_cache_release(pg); | |
655 | } | |
656 | ||
657 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { | |
658 | int ret = 0; | |
182ec4ee | 659 | |
1da177e4 LT |
660 | if (jffs2_cleanmarker_oob(c)) { |
661 | /* NAND flash... do setup accordingly */ | |
662 | ret = jffs2_nand_flash_setup(c); | |
663 | if (ret) | |
664 | return ret; | |
665 | } | |
666 | ||
8f15fd55 AV |
667 | /* and Dataflash */ |
668 | if (jffs2_dataflash(c)) { | |
669 | ret = jffs2_dataflash_setup(c); | |
670 | if (ret) | |
671 | return ret; | |
672 | } | |
59da721a NP |
673 | |
674 | /* and Intel "Sibley" flash */ | |
675 | if (jffs2_nor_wbuf_flash(c)) { | |
676 | ret = jffs2_nor_wbuf_flash_setup(c); | |
677 | if (ret) | |
678 | return ret; | |
679 | } | |
680 | ||
1da177e4 LT |
681 | return ret; |
682 | } | |
683 | ||
684 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { | |
685 | ||
686 | if (jffs2_cleanmarker_oob(c)) { | |
687 | jffs2_nand_flash_cleanup(c); | |
688 | } | |
689 | ||
8f15fd55 AV |
690 | /* and DataFlash */ |
691 | if (jffs2_dataflash(c)) { | |
692 | jffs2_dataflash_cleanup(c); | |
693 | } | |
59da721a NP |
694 | |
695 | /* and Intel "Sibley" flash */ | |
696 | if (jffs2_nor_wbuf_flash(c)) { | |
697 | jffs2_nor_wbuf_flash_cleanup(c); | |
698 | } | |
1da177e4 | 699 | } |