Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
6088c058 | 5 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
1da177e4 LT |
6 | * |
7 | * Created by David Woodhouse <dwmw2@infradead.org> | |
8 | * | |
9 | * For licensing information, see the file 'LICENCE' in this directory. | |
10 | * | |
1da177e4 LT |
11 | */ |
12 | ||
16f7e0fe | 13 | #include <linux/capability.h> |
1da177e4 LT |
14 | #include <linux/kernel.h> |
15 | #include <linux/sched.h> | |
16 | #include <linux/fs.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/mtd/mtd.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/vmalloc.h> | |
22 | #include <linux/vfs.h> | |
23 | #include <linux/crc32.h> | |
24 | #include "nodelist.h" | |
25 | ||
26 | static int jffs2_flash_setup(struct jffs2_sb_info *c); | |
27 | ||
9ed437c5 | 28 | int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) |
1da177e4 LT |
29 | { |
30 | struct jffs2_full_dnode *old_metadata, *new_metadata; | |
31 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
32 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
33 | struct jffs2_raw_inode *ri; | |
aef9ab47 | 34 | union jffs2_device_node dev; |
1da177e4 LT |
35 | unsigned char *mdata = NULL; |
36 | int mdatalen = 0; | |
37 | unsigned int ivalid; | |
9fe4854c | 38 | uint32_t alloclen; |
1da177e4 | 39 | int ret; |
dd919660 | 40 | int alloc_type = ALLOC_NORMAL; |
9ed437c5 | 41 | |
9c261b33 | 42 | jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino); |
1da177e4 LT |
43 | |
44 | /* Special cases - we don't want more than one data node | |
45 | for these types on the medium at any time. So setattr | |
46 | must read the original data associated with the node | |
47 | (i.e. the device numbers or the target name) and write | |
48 | it out again with the appropriate data attached */ | |
49 | if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { | |
50 | /* For these, we don't actually need to read the old node */ | |
aef9ab47 | 51 | mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); |
1da177e4 | 52 | mdata = (char *)&dev; |
9c261b33 JP |
53 | jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n", |
54 | __func__, mdatalen); | |
1da177e4 | 55 | } else if (S_ISLNK(inode->i_mode)) { |
ced22070 | 56 | mutex_lock(&f->sem); |
1da177e4 LT |
57 | mdatalen = f->metadata->size; |
58 | mdata = kmalloc(f->metadata->size, GFP_USER); | |
422138dd | 59 | if (!mdata) { |
ced22070 | 60 | mutex_unlock(&f->sem); |
1da177e4 | 61 | return -ENOMEM; |
422138dd | 62 | } |
1da177e4 LT |
63 | ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); |
64 | if (ret) { | |
ced22070 | 65 | mutex_unlock(&f->sem); |
1da177e4 LT |
66 | kfree(mdata); |
67 | return ret; | |
68 | } | |
ced22070 | 69 | mutex_unlock(&f->sem); |
9c261b33 JP |
70 | jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n", |
71 | __func__, mdatalen); | |
1da177e4 LT |
72 | } |
73 | ||
74 | ri = jffs2_alloc_raw_inode(); | |
75 | if (!ri) { | |
76 | if (S_ISLNK(inode->i_mode)) | |
77 | kfree(mdata); | |
78 | return -ENOMEM; | |
79 | } | |
182ec4ee | 80 | |
9fe4854c DW |
81 | ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, |
82 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
83 | if (ret) { |
84 | jffs2_free_raw_inode(ri); | |
61effb51 | 85 | if (S_ISLNK(inode->i_mode)) |
1da177e4 LT |
86 | kfree(mdata); |
87 | return ret; | |
88 | } | |
ced22070 | 89 | mutex_lock(&f->sem); |
1da177e4 | 90 | ivalid = iattr->ia_valid; |
182ec4ee | 91 | |
1da177e4 LT |
92 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
93 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
94 | ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); | |
95 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
96 | ||
97 | ri->ino = cpu_to_je32(inode->i_ino); | |
98 | ri->version = cpu_to_je32(++f->highest_version); | |
99 | ||
100 | ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid); | |
101 | ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid); | |
102 | ||
103 | if (ivalid & ATTR_MODE) | |
857013b8 | 104 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
1da177e4 LT |
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); | |
dd919660 DW |
122 | } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { |
123 | /* For truncate-to-zero, treat it as deletion because | |
124 | it'll always be obsoleting all previous nodes */ | |
125 | alloc_type = ALLOC_DELETION; | |
1da177e4 LT |
126 | } |
127 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
128 | if (mdatalen) | |
129 | ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); | |
130 | else | |
131 | ri->data_crc = cpu_to_je32(0); | |
132 | ||
dd919660 | 133 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); |
1da177e4 LT |
134 | if (S_ISLNK(inode->i_mode)) |
135 | kfree(mdata); | |
182ec4ee | 136 | |
1da177e4 LT |
137 | if (IS_ERR(new_metadata)) { |
138 | jffs2_complete_reservation(c); | |
139 | jffs2_free_raw_inode(ri); | |
ced22070 | 140 | mutex_unlock(&f->sem); |
1da177e4 LT |
141 | return PTR_ERR(new_metadata); |
142 | } | |
143 | /* It worked. Update the inode */ | |
144 | inode->i_atime = ITIME(je32_to_cpu(ri->atime)); | |
145 | inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
146 | inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); | |
147 | inode->i_mode = jemode_to_cpu(ri->mode); | |
148 | inode->i_uid = je16_to_cpu(ri->uid); | |
149 | inode->i_gid = je16_to_cpu(ri->gid); | |
150 | ||
151 | ||
152 | old_metadata = f->metadata; | |
153 | ||
154 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
f302cd02 | 155 | jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
1da177e4 LT |
156 | |
157 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
158 | jffs2_add_full_dnode_to_inode(c, f, new_metadata); | |
159 | inode->i_size = iattr->ia_size; | |
b28ba9fa | 160 | inode->i_blocks = (inode->i_size + 511) >> 9; |
1da177e4 LT |
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 | ||
ced22070 | 171 | mutex_unlock(&f->sem); |
1da177e4 LT |
172 | jffs2_complete_reservation(c); |
173 | ||
2c27c65e | 174 | /* We have to do the truncate_setsize() 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. */ | |
b28ba9fa | 179 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { |
2c27c65e | 180 | truncate_setsize(inode, iattr->ia_size); |
b28ba9fa DW |
181 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182 | } | |
1da177e4 LT |
183 | |
184 | return 0; | |
185 | } | |
186 | ||
187 | int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) | |
188 | { | |
aa98d7cf KK |
189 | int rc; |
190 | ||
9ed437c5 DW |
191 | rc = inode_change_ok(dentry->d_inode, iattr); |
192 | if (rc) | |
193 | return rc; | |
194 | ||
aa98d7cf KK |
195 | rc = jffs2_do_setattr(dentry->d_inode, iattr); |
196 | if (!rc && (iattr->ia_valid & ATTR_MODE)) | |
197 | rc = jffs2_acl_chmod(dentry->d_inode); | |
9ed437c5 | 198 | |
aa98d7cf | 199 | return rc; |
1da177e4 LT |
200 | } |
201 | ||
726c3342 | 202 | int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 203 | { |
726c3342 | 204 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
1da177e4 LT |
205 | unsigned long avail; |
206 | ||
207 | buf->f_type = JFFS2_SUPER_MAGIC; | |
208 | buf->f_bsize = 1 << PAGE_SHIFT; | |
209 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; | |
210 | buf->f_files = 0; | |
211 | buf->f_ffree = 0; | |
212 | buf->f_namelen = JFFS2_MAX_NAME_LEN; | |
75caf6b5 DW |
213 | buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; |
214 | buf->f_fsid.val[1] = c->mtd->index; | |
1da177e4 LT |
215 | |
216 | spin_lock(&c->erase_completion_lock); | |
1da177e4 LT |
217 | avail = c->dirty_size + c->free_size; |
218 | if (avail > c->sector_size * c->resv_blocks_write) | |
219 | avail -= c->sector_size * c->resv_blocks_write; | |
220 | else | |
221 | avail = 0; | |
e0c8e42f | 222 | spin_unlock(&c->erase_completion_lock); |
1da177e4 LT |
223 | |
224 | buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; | |
225 | ||
1da177e4 LT |
226 | return 0; |
227 | } | |
228 | ||
229 | ||
b57922d9 | 230 | void jffs2_evict_inode (struct inode *inode) |
1da177e4 | 231 | { |
182ec4ee | 232 | /* We can forget about this inode for now - drop all |
1da177e4 LT |
233 | * the nodelists associated with it, etc. |
234 | */ | |
235 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
236 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
182ec4ee | 237 | |
9c261b33 JP |
238 | jffs2_dbg(1, "%s(): ino #%lu mode %o\n", |
239 | __func__, inode->i_ino, inode->i_mode); | |
b57922d9 AV |
240 | truncate_inode_pages(&inode->i_data, 0); |
241 | end_writeback(inode); | |
1da177e4 LT |
242 | jffs2_do_clear_inode(c, f); |
243 | } | |
244 | ||
5451f79f | 245 | struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
246 | { |
247 | struct jffs2_inode_info *f; | |
248 | struct jffs2_sb_info *c; | |
249 | struct jffs2_raw_inode latest_node; | |
aef9ab47 | 250 | union jffs2_device_node jdev; |
5451f79f | 251 | struct inode *inode; |
aef9ab47 | 252 | dev_t rdev = 0; |
1da177e4 LT |
253 | int ret; |
254 | ||
9c261b33 | 255 | jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino); |
5451f79f DH |
256 | |
257 | inode = iget_locked(sb, ino); | |
258 | if (!inode) | |
259 | return ERR_PTR(-ENOMEM); | |
260 | if (!(inode->i_state & I_NEW)) | |
261 | return inode; | |
1da177e4 LT |
262 | |
263 | f = JFFS2_INODE_INFO(inode); | |
264 | c = JFFS2_SB_INFO(inode->i_sb); | |
265 | ||
266 | jffs2_init_inode_info(f); | |
ced22070 | 267 | mutex_lock(&f->sem); |
182ec4ee | 268 | |
1da177e4 LT |
269 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
270 | ||
271 | if (ret) { | |
ced22070 | 272 | mutex_unlock(&f->sem); |
5451f79f DH |
273 | iget_failed(inode); |
274 | return ERR_PTR(ret); | |
1da177e4 LT |
275 | } |
276 | inode->i_mode = jemode_to_cpu(latest_node.mode); | |
277 | inode->i_uid = je16_to_cpu(latest_node.uid); | |
278 | inode->i_gid = je16_to_cpu(latest_node.gid); | |
279 | inode->i_size = je32_to_cpu(latest_node.isize); | |
280 | inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); | |
281 | inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); | |
282 | inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); | |
283 | ||
bfe86848 | 284 | set_nlink(inode, f->inocache->pino_nlink); |
1da177e4 | 285 | |
1da177e4 | 286 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 287 | |
1da177e4 | 288 | switch (inode->i_mode & S_IFMT) { |
1da177e4 LT |
289 | |
290 | case S_IFLNK: | |
291 | inode->i_op = &jffs2_symlink_inode_operations; | |
292 | break; | |
182ec4ee | 293 | |
1da177e4 LT |
294 | case S_IFDIR: |
295 | { | |
296 | struct jffs2_full_dirent *fd; | |
bfe86848 | 297 | set_nlink(inode, 2); /* parent and '.' */ |
1da177e4 LT |
298 | |
299 | for (fd=f->dents; fd; fd = fd->next) { | |
300 | if (fd->type == DT_DIR && fd->ino) | |
d8c76e6f | 301 | inc_nlink(inode); |
1da177e4 | 302 | } |
1da177e4 LT |
303 | /* Root dir gets i_nlink 3 for some reason */ |
304 | if (inode->i_ino == 1) | |
d8c76e6f | 305 | inc_nlink(inode); |
1da177e4 LT |
306 | |
307 | inode->i_op = &jffs2_dir_inode_operations; | |
308 | inode->i_fop = &jffs2_dir_operations; | |
309 | break; | |
310 | } | |
311 | case S_IFREG: | |
312 | inode->i_op = &jffs2_file_inode_operations; | |
313 | inode->i_fop = &jffs2_file_operations; | |
314 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
315 | inode->i_mapping->nrpages = 0; | |
316 | break; | |
317 | ||
318 | case S_IFBLK: | |
319 | case S_IFCHR: | |
320 | /* Read the device numbers from the media */ | |
91f80266 AM |
321 | if (f->metadata->size != sizeof(jdev.old_id) && |
322 | f->metadata->size != sizeof(jdev.new_id)) { | |
da320f05 JP |
323 | pr_notice("Device node has strange size %d\n", |
324 | f->metadata->size); | |
5451f79f | 325 | goto error_io; |
aef9ab47 | 326 | } |
9c261b33 | 327 | jffs2_dbg(1, "Reading device numbers from flash\n"); |
5451f79f DH |
328 | ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); |
329 | if (ret < 0) { | |
1da177e4 | 330 | /* Eep */ |
da320f05 JP |
331 | pr_notice("Read device numbers for inode %lu failed\n", |
332 | (unsigned long)inode->i_ino); | |
5451f79f | 333 | goto error; |
182ec4ee | 334 | } |
91f80266 AM |
335 | if (f->metadata->size == sizeof(jdev.old_id)) |
336 | rdev = old_decode_dev(je16_to_cpu(jdev.old_id)); | |
aef9ab47 | 337 | else |
91f80266 | 338 | rdev = new_decode_dev(je32_to_cpu(jdev.new_id)); |
1da177e4 LT |
339 | |
340 | case S_IFSOCK: | |
341 | case S_IFIFO: | |
342 | inode->i_op = &jffs2_file_inode_operations; | |
aef9ab47 | 343 | init_special_inode(inode, inode->i_mode, rdev); |
1da177e4 LT |
344 | break; |
345 | ||
346 | default: | |
da320f05 JP |
347 | pr_warn("%s(): Bogus i_mode %o for ino %lu\n", |
348 | __func__, inode->i_mode, (unsigned long)inode->i_ino); | |
1da177e4 LT |
349 | } |
350 | ||
ced22070 | 351 | mutex_unlock(&f->sem); |
1da177e4 | 352 | |
9c261b33 | 353 | jffs2_dbg(1, "jffs2_read_inode() returning\n"); |
5451f79f DH |
354 | unlock_new_inode(inode); |
355 | return inode; | |
356 | ||
357 | error_io: | |
358 | ret = -EIO; | |
359 | error: | |
ced22070 | 360 | mutex_unlock(&f->sem); |
5451f79f DH |
361 | jffs2_do_clear_inode(c, f); |
362 | iget_failed(inode); | |
363 | return ERR_PTR(ret); | |
1da177e4 LT |
364 | } |
365 | ||
aa385729 | 366 | void jffs2_dirty_inode(struct inode *inode, int flags) |
1da177e4 LT |
367 | { |
368 | struct iattr iattr; | |
369 | ||
370 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { | |
9c261b33 JP |
371 | jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n", |
372 | __func__, inode->i_ino); | |
1da177e4 LT |
373 | return; |
374 | } | |
375 | ||
9c261b33 JP |
376 | jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n", |
377 | __func__, inode->i_ino); | |
1da177e4 LT |
378 | |
379 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; | |
380 | iattr.ia_mode = inode->i_mode; | |
381 | iattr.ia_uid = inode->i_uid; | |
382 | iattr.ia_gid = inode->i_gid; | |
383 | iattr.ia_atime = inode->i_atime; | |
384 | iattr.ia_mtime = inode->i_mtime; | |
385 | iattr.ia_ctime = inode->i_ctime; | |
386 | ||
387 | jffs2_do_setattr(inode, &iattr); | |
388 | } | |
389 | ||
92abc475 | 390 | int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data) |
1da177e4 LT |
391 | { |
392 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
393 | ||
394 | if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) | |
395 | return -EROFS; | |
396 | ||
397 | /* We stop if it was running, then restart if it needs to. | |
398 | This also catches the case where it was stopped and this | |
399 | is just a remount to restart it. | |
400 | Flush the writebuffer, if neccecary, else we loose it */ | |
401 | if (!(sb->s_flags & MS_RDONLY)) { | |
402 | jffs2_stop_garbage_collect_thread(c); | |
ced22070 | 403 | mutex_lock(&c->alloc_sem); |
1da177e4 | 404 | jffs2_flush_wbuf_pad(c); |
ced22070 | 405 | mutex_unlock(&c->alloc_sem); |
182ec4ee | 406 | } |
1da177e4 LT |
407 | |
408 | if (!(*flags & MS_RDONLY)) | |
409 | jffs2_start_garbage_collect_thread(c); | |
182ec4ee | 410 | |
1da177e4 | 411 | *flags |= MS_NOATIME; |
1da177e4 LT |
412 | return 0; |
413 | } | |
414 | ||
1da177e4 LT |
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. */ | |
d3fb6120 | 417 | struct inode *jffs2_new_inode (struct inode *dir_i, umode_t 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 | ||
9c261b33 JP |
425 | jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n", |
426 | __func__, dir_i->i_ino, mode); | |
1da177e4 LT |
427 | |
428 | c = JFFS2_SB_INFO(sb); | |
182ec4ee | 429 | |
1da177e4 | 430 | inode = new_inode(sb); |
182ec4ee | 431 | |
1da177e4 LT |
432 | if (!inode) |
433 | return ERR_PTR(-ENOMEM); | |
434 | ||
435 | f = JFFS2_INODE_INFO(inode); | |
436 | jffs2_init_inode_info(f); | |
ced22070 | 437 | mutex_lock(&f->sem); |
1da177e4 LT |
438 | |
439 | memset(ri, 0, sizeof(*ri)); | |
440 | /* Set OS-specific defaults for new inodes */ | |
3fc678a0 | 441 | ri->uid = cpu_to_je16(current_fsuid()); |
1da177e4 LT |
442 | |
443 | if (dir_i->i_mode & S_ISGID) { | |
444 | ri->gid = cpu_to_je16(dir_i->i_gid); | |
445 | if (S_ISDIR(mode)) | |
446 | mode |= S_ISGID; | |
447 | } else { | |
3fc678a0 | 448 | ri->gid = cpu_to_je16(current_fsgid()); |
1da177e4 | 449 | } |
9ed437c5 DW |
450 | |
451 | /* POSIX ACLs have to be processed now, at least partly. | |
452 | The umask is only applied if there's no default ACL */ | |
cfc8dc6f KK |
453 | ret = jffs2_init_acl_pre(dir_i, inode, &mode); |
454 | if (ret) { | |
455 | make_bad_inode(inode); | |
456 | iput(inode); | |
457 | return ERR_PTR(ret); | |
9ed437c5 | 458 | } |
1da177e4 LT |
459 | ret = jffs2_do_new_inode (c, f, mode, ri); |
460 | if (ret) { | |
461 | make_bad_inode(inode); | |
462 | iput(inode); | |
463 | return ERR_PTR(ret); | |
464 | } | |
bfe86848 | 465 | set_nlink(inode, 1); |
1da177e4 LT |
466 | inode->i_ino = je32_to_cpu(ri->ino); |
467 | inode->i_mode = jemode_to_cpu(ri->mode); | |
468 | inode->i_gid = je16_to_cpu(ri->gid); | |
469 | inode->i_uid = je16_to_cpu(ri->uid); | |
470 | inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; | |
471 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); | |
472 | ||
1da177e4 LT |
473 | inode->i_blocks = 0; |
474 | inode->i_size = 0; | |
475 | ||
e72e6497 DW |
476 | if (insert_inode_locked(inode) < 0) { |
477 | make_bad_inode(inode); | |
e72e6497 DW |
478 | iput(inode); |
479 | return ERR_PTR(-EINVAL); | |
480 | } | |
1da177e4 LT |
481 | |
482 | return inode; | |
483 | } | |
484 | ||
65e5a0e1 DD |
485 | static int calculate_inocache_hashsize(uint32_t flash_size) |
486 | { | |
487 | /* | |
488 | * Pick a inocache hash size based on the size of the medium. | |
489 | * Count how many megabytes we're dealing with, apply a hashsize twice | |
490 | * that size, but rounding down to the usual big powers of 2. And keep | |
491 | * to sensible bounds. | |
492 | */ | |
493 | ||
494 | int size_mb = flash_size / 1024 / 1024; | |
495 | int hashsize = (size_mb * 2) & ~0x3f; | |
496 | ||
497 | if (hashsize < INOCACHE_HASHSIZE_MIN) | |
498 | return INOCACHE_HASHSIZE_MIN; | |
499 | if (hashsize > INOCACHE_HASHSIZE_MAX) | |
500 | return INOCACHE_HASHSIZE_MAX; | |
501 | ||
502 | return hashsize; | |
503 | } | |
1da177e4 LT |
504 | |
505 | int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) | |
506 | { | |
507 | struct jffs2_sb_info *c; | |
508 | struct inode *root_i; | |
509 | int ret; | |
510 | size_t blocks; | |
511 | ||
512 | c = JFFS2_SB_INFO(sb); | |
513 | ||
2f82ce1e | 514 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 515 | if (c->mtd->type == MTD_NANDFLASH) { |
da320f05 | 516 | pr_err("jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n"); |
1da177e4 LT |
517 | return -EINVAL; |
518 | } | |
8f15fd55 | 519 | if (c->mtd->type == MTD_DATAFLASH) { |
da320f05 | 520 | pr_err("jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n"); |
8f15fd55 AV |
521 | return -EINVAL; |
522 | } | |
523 | #endif | |
1da177e4 LT |
524 | |
525 | c->flash_size = c->mtd->size; | |
182ec4ee | 526 | c->sector_size = c->mtd->erasesize; |
1da177e4 | 527 | blocks = c->flash_size / c->sector_size; |
1da177e4 LT |
528 | |
529 | /* | |
530 | * Size alignment check | |
531 | */ | |
532 | if ((c->sector_size * blocks) != c->flash_size) { | |
182ec4ee | 533 | c->flash_size = c->sector_size * blocks; |
da320f05 | 534 | pr_info("jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n", |
1da177e4 LT |
535 | c->flash_size / 1024); |
536 | } | |
537 | ||
1da177e4 | 538 | if (c->flash_size < 5*c->sector_size) { |
da320f05 JP |
539 | pr_err("jffs2: Too few erase blocks (%d)\n", |
540 | c->flash_size / c->sector_size); | |
1da177e4 LT |
541 | return -EINVAL; |
542 | } | |
543 | ||
544 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); | |
1da177e4 LT |
545 | |
546 | /* NAND (or other bizarre) flash... do setup accordingly */ | |
547 | ret = jffs2_flash_setup(c); | |
548 | if (ret) | |
549 | return ret; | |
550 | ||
65e5a0e1 DD |
551 | c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size); |
552 | c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); | |
1da177e4 LT |
553 | if (!c->inocache_list) { |
554 | ret = -ENOMEM; | |
555 | goto out_wbuf; | |
556 | } | |
1da177e4 | 557 | |
aa98d7cf KK |
558 | jffs2_init_xattr_subsystem(c); |
559 | ||
1da177e4 LT |
560 | if ((ret = jffs2_do_mount_fs(c))) |
561 | goto out_inohash; | |
562 | ||
9c261b33 | 563 | jffs2_dbg(1, "%s(): Getting root inode\n", __func__); |
5451f79f DH |
564 | root_i = jffs2_iget(sb, 1); |
565 | if (IS_ERR(root_i)) { | |
9c261b33 | 566 | jffs2_dbg(1, "get root inode failed\n"); |
5451f79f DH |
567 | ret = PTR_ERR(root_i); |
568 | goto out_root; | |
1da177e4 LT |
569 | } |
570 | ||
5451f79f DH |
571 | ret = -ENOMEM; |
572 | ||
9c261b33 | 573 | jffs2_dbg(1, "%s(): d_alloc_root()\n", __func__); |
1da177e4 LT |
574 | sb->s_root = d_alloc_root(root_i); |
575 | if (!sb->s_root) | |
576 | goto out_root_i; | |
577 | ||
1da177e4 | 578 | sb->s_maxbytes = 0xFFFFFFFF; |
1da177e4 LT |
579 | sb->s_blocksize = PAGE_CACHE_SIZE; |
580 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
581 | sb->s_magic = JFFS2_SUPER_MAGIC; | |
582 | if (!(sb->s_flags & MS_RDONLY)) | |
583 | jffs2_start_garbage_collect_thread(c); | |
584 | return 0; | |
585 | ||
586 | out_root_i: | |
587 | iput(root_i); | |
5451f79f | 588 | out_root: |
1da177e4 LT |
589 | jffs2_free_ino_caches(c); |
590 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 591 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
592 | vfree(c->blocks); |
593 | else | |
594 | kfree(c->blocks); | |
595 | out_inohash: | |
aa98d7cf | 596 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
597 | kfree(c->inocache_list); |
598 | out_wbuf: | |
599 | jffs2_flash_cleanup(c); | |
600 | ||
601 | return ret; | |
602 | } | |
603 | ||
604 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, | |
605 | struct jffs2_inode_info *f) | |
606 | { | |
607 | iput(OFNI_EDONI_2SFFJ(f)); | |
608 | } | |
609 | ||
610 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, | |
1b690b48 | 611 | int inum, int unlinked) |
1da177e4 LT |
612 | { |
613 | struct inode *inode; | |
614 | struct jffs2_inode_cache *ic; | |
1b690b48 DW |
615 | |
616 | if (unlinked) { | |
1da177e4 | 617 | /* The inode has zero nlink but its nodes weren't yet marked |
182ec4ee | 618 | obsolete. This has to be because we're still waiting for |
1da177e4 LT |
619 | the final (close() and) iput() to happen. |
620 | ||
182ec4ee | 621 | There's a possibility that the final iput() could have |
1da177e4 LT |
622 | happened while we were contemplating. In order to ensure |
623 | that we don't cause a new read_inode() (which would fail) | |
624 | for the inode in question, we use ilookup() in this case | |
625 | instead of iget(). | |
626 | ||
182ec4ee | 627 | The nlink can't _become_ zero at this point because we're |
1da177e4 LT |
628 | holding the alloc_sem, and jffs2_do_unlink() would also |
629 | need that while decrementing nlink on any inode. | |
630 | */ | |
631 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); | |
632 | if (!inode) { | |
9c261b33 JP |
633 | jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n", |
634 | inum); | |
1da177e4 LT |
635 | |
636 | spin_lock(&c->inocache_lock); | |
637 | ic = jffs2_get_ino_cache(c, inum); | |
638 | if (!ic) { | |
9c261b33 JP |
639 | jffs2_dbg(1, "Inode cache for ino #%u is gone\n", |
640 | inum); | |
1da177e4 LT |
641 | spin_unlock(&c->inocache_lock); |
642 | return NULL; | |
643 | } | |
644 | if (ic->state != INO_STATE_CHECKEDABSENT) { | |
645 | /* Wait for progress. Don't just loop */ | |
9c261b33 JP |
646 | jffs2_dbg(1, "Waiting for ino #%u in state %d\n", |
647 | ic->ino, ic->state); | |
1da177e4 LT |
648 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); |
649 | } else { | |
650 | spin_unlock(&c->inocache_lock); | |
651 | } | |
652 | ||
653 | return NULL; | |
654 | } | |
655 | } else { | |
656 | /* Inode has links to it still; they're not going away because | |
657 | jffs2_do_unlink() would need the alloc_sem and we have it. | |
658 | Just iget() it, and if read_inode() is necessary that's OK. | |
659 | */ | |
5451f79f DH |
660 | inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); |
661 | if (IS_ERR(inode)) | |
662 | return ERR_CAST(inode); | |
1da177e4 LT |
663 | } |
664 | if (is_bad_inode(inode)) { | |
da320f05 JP |
665 | pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n", |
666 | inum, unlinked); | |
1da177e4 LT |
667 | /* NB. This will happen again. We need to do something appropriate here. */ |
668 | iput(inode); | |
669 | return ERR_PTR(-EIO); | |
670 | } | |
671 | ||
672 | return JFFS2_INODE_INFO(inode); | |
673 | } | |
674 | ||
182ec4ee TG |
675 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
676 | struct jffs2_inode_info *f, | |
1da177e4 LT |
677 | unsigned long offset, |
678 | unsigned long *priv) | |
679 | { | |
680 | struct inode *inode = OFNI_EDONI_2SFFJ(f); | |
681 | struct page *pg; | |
682 | ||
fc0e0197 | 683 | pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
1da177e4 LT |
684 | (void *)jffs2_do_readpage_unlock, inode); |
685 | if (IS_ERR(pg)) | |
686 | return (void *)pg; | |
182ec4ee | 687 | |
1da177e4 LT |
688 | *priv = (unsigned long)pg; |
689 | return kmap(pg); | |
690 | } | |
691 | ||
692 | void jffs2_gc_release_page(struct jffs2_sb_info *c, | |
693 | unsigned char *ptr, | |
694 | unsigned long *priv) | |
695 | { | |
696 | struct page *pg = (void *)*priv; | |
697 | ||
698 | kunmap(pg); | |
699 | page_cache_release(pg); | |
700 | } | |
701 | ||
702 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { | |
703 | int ret = 0; | |
182ec4ee | 704 | |
1da177e4 LT |
705 | if (jffs2_cleanmarker_oob(c)) { |
706 | /* NAND flash... do setup accordingly */ | |
707 | ret = jffs2_nand_flash_setup(c); | |
708 | if (ret) | |
709 | return ret; | |
710 | } | |
711 | ||
8f15fd55 AV |
712 | /* and Dataflash */ |
713 | if (jffs2_dataflash(c)) { | |
714 | ret = jffs2_dataflash_setup(c); | |
715 | if (ret) | |
716 | return ret; | |
717 | } | |
59da721a NP |
718 | |
719 | /* and Intel "Sibley" flash */ | |
720 | if (jffs2_nor_wbuf_flash(c)) { | |
721 | ret = jffs2_nor_wbuf_flash_setup(c); | |
722 | if (ret) | |
723 | return ret; | |
724 | } | |
725 | ||
0029da3b AB |
726 | /* and an UBI volume */ |
727 | if (jffs2_ubivol(c)) { | |
728 | ret = jffs2_ubivol_setup(c); | |
729 | if (ret) | |
730 | return ret; | |
731 | } | |
732 | ||
1da177e4 LT |
733 | return ret; |
734 | } | |
735 | ||
736 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { | |
737 | ||
738 | if (jffs2_cleanmarker_oob(c)) { | |
739 | jffs2_nand_flash_cleanup(c); | |
740 | } | |
741 | ||
8f15fd55 AV |
742 | /* and DataFlash */ |
743 | if (jffs2_dataflash(c)) { | |
744 | jffs2_dataflash_cleanup(c); | |
745 | } | |
59da721a NP |
746 | |
747 | /* and Intel "Sibley" flash */ | |
748 | if (jffs2_nor_wbuf_flash(c)) { | |
749 | jffs2_nor_wbuf_flash_cleanup(c); | |
750 | } | |
0029da3b AB |
751 | |
752 | /* and an UBI volume */ | |
753 | if (jffs2_ubivol(c)) { | |
754 | jffs2_ubivol_cleanup(c); | |
755 | } | |
1da177e4 | 756 | } |