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Commit | Line | Data |
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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 | |
1da177e4 | 42 | D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", 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; |
1da177e4 LT |
53 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen)); |
54 | } else if (S_ISLNK(inode->i_mode)) { | |
ced22070 | 55 | mutex_lock(&f->sem); |
1da177e4 LT |
56 | mdatalen = f->metadata->size; |
57 | mdata = kmalloc(f->metadata->size, GFP_USER); | |
422138dd | 58 | if (!mdata) { |
ced22070 | 59 | mutex_unlock(&f->sem); |
1da177e4 | 60 | return -ENOMEM; |
422138dd | 61 | } |
1da177e4 LT |
62 | ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); |
63 | if (ret) { | |
ced22070 | 64 | mutex_unlock(&f->sem); |
1da177e4 LT |
65 | kfree(mdata); |
66 | return ret; | |
67 | } | |
ced22070 | 68 | mutex_unlock(&f->sem); |
1da177e4 LT |
69 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen)); |
70 | } | |
71 | ||
72 | ri = jffs2_alloc_raw_inode(); | |
73 | if (!ri) { | |
74 | if (S_ISLNK(inode->i_mode)) | |
75 | kfree(mdata); | |
76 | return -ENOMEM; | |
77 | } | |
182ec4ee | 78 | |
9fe4854c DW |
79 | ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, |
80 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
81 | if (ret) { |
82 | jffs2_free_raw_inode(ri); | |
61effb51 | 83 | if (S_ISLNK(inode->i_mode)) |
1da177e4 LT |
84 | kfree(mdata); |
85 | return ret; | |
86 | } | |
ced22070 | 87 | mutex_lock(&f->sem); |
1da177e4 | 88 | ivalid = iattr->ia_valid; |
182ec4ee | 89 | |
1da177e4 LT |
90 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
91 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
92 | ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); | |
93 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
94 | ||
95 | ri->ino = cpu_to_je32(inode->i_ino); | |
96 | ri->version = cpu_to_je32(++f->highest_version); | |
97 | ||
98 | ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid); | |
99 | ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid); | |
100 | ||
101 | if (ivalid & ATTR_MODE) | |
857013b8 | 102 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
1da177e4 LT |
103 | else |
104 | ri->mode = cpu_to_jemode(inode->i_mode); | |
105 | ||
106 | ||
107 | ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); | |
108 | ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); | |
109 | ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); | |
110 | ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); | |
111 | ||
112 | ri->offset = cpu_to_je32(0); | |
113 | ri->csize = ri->dsize = cpu_to_je32(mdatalen); | |
114 | ri->compr = JFFS2_COMPR_NONE; | |
115 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
116 | /* It's an extension. Make it a hole node */ | |
117 | ri->compr = JFFS2_COMPR_ZERO; | |
118 | ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); | |
119 | ri->offset = cpu_to_je32(inode->i_size); | |
dd919660 DW |
120 | } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { |
121 | /* For truncate-to-zero, treat it as deletion because | |
122 | it'll always be obsoleting all previous nodes */ | |
123 | alloc_type = ALLOC_DELETION; | |
1da177e4 LT |
124 | } |
125 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
126 | if (mdatalen) | |
127 | ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); | |
128 | else | |
129 | ri->data_crc = cpu_to_je32(0); | |
130 | ||
dd919660 | 131 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); |
1da177e4 LT |
132 | if (S_ISLNK(inode->i_mode)) |
133 | kfree(mdata); | |
182ec4ee | 134 | |
1da177e4 LT |
135 | if (IS_ERR(new_metadata)) { |
136 | jffs2_complete_reservation(c); | |
137 | jffs2_free_raw_inode(ri); | |
ced22070 | 138 | mutex_unlock(&f->sem); |
1da177e4 LT |
139 | return PTR_ERR(new_metadata); |
140 | } | |
141 | /* It worked. Update the inode */ | |
142 | inode->i_atime = ITIME(je32_to_cpu(ri->atime)); | |
143 | inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
144 | inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); | |
145 | inode->i_mode = jemode_to_cpu(ri->mode); | |
146 | inode->i_uid = je16_to_cpu(ri->uid); | |
147 | inode->i_gid = je16_to_cpu(ri->gid); | |
148 | ||
149 | ||
150 | old_metadata = f->metadata; | |
151 | ||
152 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
f302cd02 | 153 | jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
1da177e4 LT |
154 | |
155 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
156 | jffs2_add_full_dnode_to_inode(c, f, new_metadata); | |
157 | inode->i_size = iattr->ia_size; | |
b28ba9fa | 158 | inode->i_blocks = (inode->i_size + 511) >> 9; |
1da177e4 LT |
159 | f->metadata = NULL; |
160 | } else { | |
161 | f->metadata = new_metadata; | |
162 | } | |
163 | if (old_metadata) { | |
164 | jffs2_mark_node_obsolete(c, old_metadata->raw); | |
165 | jffs2_free_full_dnode(old_metadata); | |
166 | } | |
167 | jffs2_free_raw_inode(ri); | |
168 | ||
ced22070 | 169 | mutex_unlock(&f->sem); |
1da177e4 LT |
170 | jffs2_complete_reservation(c); |
171 | ||
2c27c65e | 172 | /* We have to do the truncate_setsize() without f->sem held, since |
182ec4ee | 173 | some pages may be locked and waiting for it in readpage(). |
1da177e4 LT |
174 | We are protected from a simultaneous write() extending i_size |
175 | back past iattr->ia_size, because do_truncate() holds the | |
176 | generic inode semaphore. */ | |
b28ba9fa | 177 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { |
2c27c65e | 178 | truncate_setsize(inode, iattr->ia_size); |
b28ba9fa DW |
179 | inode->i_blocks = (inode->i_size + 511) >> 9; |
180 | } | |
1da177e4 LT |
181 | |
182 | return 0; | |
183 | } | |
184 | ||
185 | int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) | |
186 | { | |
aa98d7cf KK |
187 | int rc; |
188 | ||
9ed437c5 DW |
189 | rc = inode_change_ok(dentry->d_inode, iattr); |
190 | if (rc) | |
191 | return rc; | |
192 | ||
aa98d7cf KK |
193 | rc = jffs2_do_setattr(dentry->d_inode, iattr); |
194 | if (!rc && (iattr->ia_valid & ATTR_MODE)) | |
195 | rc = jffs2_acl_chmod(dentry->d_inode); | |
9ed437c5 | 196 | |
aa98d7cf | 197 | return rc; |
1da177e4 LT |
198 | } |
199 | ||
726c3342 | 200 | int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 201 | { |
726c3342 | 202 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
1da177e4 LT |
203 | unsigned long avail; |
204 | ||
205 | buf->f_type = JFFS2_SUPER_MAGIC; | |
206 | buf->f_bsize = 1 << PAGE_SHIFT; | |
207 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; | |
208 | buf->f_files = 0; | |
209 | buf->f_ffree = 0; | |
210 | buf->f_namelen = JFFS2_MAX_NAME_LEN; | |
75caf6b5 DW |
211 | buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; |
212 | buf->f_fsid.val[1] = c->mtd->index; | |
1da177e4 LT |
213 | |
214 | spin_lock(&c->erase_completion_lock); | |
1da177e4 LT |
215 | avail = c->dirty_size + c->free_size; |
216 | if (avail > c->sector_size * c->resv_blocks_write) | |
217 | avail -= c->sector_size * c->resv_blocks_write; | |
218 | else | |
219 | avail = 0; | |
e0c8e42f | 220 | spin_unlock(&c->erase_completion_lock); |
1da177e4 LT |
221 | |
222 | buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; | |
223 | ||
1da177e4 LT |
224 | return 0; |
225 | } | |
226 | ||
227 | ||
b57922d9 | 228 | void jffs2_evict_inode (struct inode *inode) |
1da177e4 | 229 | { |
182ec4ee | 230 | /* We can forget about this inode for now - drop all |
1da177e4 LT |
231 | * the nodelists associated with it, etc. |
232 | */ | |
233 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
234 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
182ec4ee | 235 | |
b57922d9 AV |
236 | D1(printk(KERN_DEBUG "jffs2_evict_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode)); |
237 | truncate_inode_pages(&inode->i_data, 0); | |
238 | end_writeback(inode); | |
1da177e4 LT |
239 | jffs2_do_clear_inode(c, f); |
240 | } | |
241 | ||
5451f79f | 242 | struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
243 | { |
244 | struct jffs2_inode_info *f; | |
245 | struct jffs2_sb_info *c; | |
246 | struct jffs2_raw_inode latest_node; | |
aef9ab47 | 247 | union jffs2_device_node jdev; |
5451f79f | 248 | struct inode *inode; |
aef9ab47 | 249 | dev_t rdev = 0; |
1da177e4 LT |
250 | int ret; |
251 | ||
5451f79f DH |
252 | D1(printk(KERN_DEBUG "jffs2_iget(): ino == %lu\n", ino)); |
253 | ||
254 | inode = iget_locked(sb, ino); | |
255 | if (!inode) | |
256 | return ERR_PTR(-ENOMEM); | |
257 | if (!(inode->i_state & I_NEW)) | |
258 | return inode; | |
1da177e4 LT |
259 | |
260 | f = JFFS2_INODE_INFO(inode); | |
261 | c = JFFS2_SB_INFO(inode->i_sb); | |
262 | ||
263 | jffs2_init_inode_info(f); | |
ced22070 | 264 | mutex_lock(&f->sem); |
182ec4ee | 265 | |
1da177e4 LT |
266 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
267 | ||
268 | if (ret) { | |
ced22070 | 269 | mutex_unlock(&f->sem); |
5451f79f DH |
270 | iget_failed(inode); |
271 | return ERR_PTR(ret); | |
1da177e4 LT |
272 | } |
273 | inode->i_mode = jemode_to_cpu(latest_node.mode); | |
274 | inode->i_uid = je16_to_cpu(latest_node.uid); | |
275 | inode->i_gid = je16_to_cpu(latest_node.gid); | |
276 | inode->i_size = je32_to_cpu(latest_node.isize); | |
277 | inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); | |
278 | inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); | |
279 | inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); | |
280 | ||
bfe86848 | 281 | set_nlink(inode, f->inocache->pino_nlink); |
1da177e4 | 282 | |
1da177e4 | 283 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 284 | |
1da177e4 | 285 | switch (inode->i_mode & S_IFMT) { |
1da177e4 LT |
286 | |
287 | case S_IFLNK: | |
288 | inode->i_op = &jffs2_symlink_inode_operations; | |
289 | break; | |
182ec4ee | 290 | |
1da177e4 LT |
291 | case S_IFDIR: |
292 | { | |
293 | struct jffs2_full_dirent *fd; | |
bfe86848 | 294 | set_nlink(inode, 2); /* parent and '.' */ |
1da177e4 LT |
295 | |
296 | for (fd=f->dents; fd; fd = fd->next) { | |
297 | if (fd->type == DT_DIR && fd->ino) | |
d8c76e6f | 298 | inc_nlink(inode); |
1da177e4 | 299 | } |
1da177e4 LT |
300 | /* Root dir gets i_nlink 3 for some reason */ |
301 | if (inode->i_ino == 1) | |
d8c76e6f | 302 | inc_nlink(inode); |
1da177e4 LT |
303 | |
304 | inode->i_op = &jffs2_dir_inode_operations; | |
305 | inode->i_fop = &jffs2_dir_operations; | |
306 | break; | |
307 | } | |
308 | case S_IFREG: | |
309 | inode->i_op = &jffs2_file_inode_operations; | |
310 | inode->i_fop = &jffs2_file_operations; | |
311 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
312 | inode->i_mapping->nrpages = 0; | |
313 | break; | |
314 | ||
315 | case S_IFBLK: | |
316 | case S_IFCHR: | |
317 | /* Read the device numbers from the media */ | |
91f80266 AM |
318 | if (f->metadata->size != sizeof(jdev.old_id) && |
319 | f->metadata->size != sizeof(jdev.new_id)) { | |
aef9ab47 | 320 | printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size); |
5451f79f | 321 | goto error_io; |
aef9ab47 | 322 | } |
1da177e4 | 323 | D1(printk(KERN_DEBUG "Reading device numbers from flash\n")); |
5451f79f DH |
324 | ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); |
325 | if (ret < 0) { | |
1da177e4 LT |
326 | /* Eep */ |
327 | printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino); | |
5451f79f | 328 | goto error; |
182ec4ee | 329 | } |
91f80266 AM |
330 | if (f->metadata->size == sizeof(jdev.old_id)) |
331 | rdev = old_decode_dev(je16_to_cpu(jdev.old_id)); | |
aef9ab47 | 332 | else |
91f80266 | 333 | rdev = new_decode_dev(je32_to_cpu(jdev.new_id)); |
1da177e4 LT |
334 | |
335 | case S_IFSOCK: | |
336 | case S_IFIFO: | |
337 | inode->i_op = &jffs2_file_inode_operations; | |
aef9ab47 | 338 | init_special_inode(inode, inode->i_mode, rdev); |
1da177e4 LT |
339 | break; |
340 | ||
341 | default: | |
342 | printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino); | |
343 | } | |
344 | ||
ced22070 | 345 | mutex_unlock(&f->sem); |
1da177e4 LT |
346 | |
347 | D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n")); | |
5451f79f DH |
348 | unlock_new_inode(inode); |
349 | return inode; | |
350 | ||
351 | error_io: | |
352 | ret = -EIO; | |
353 | error: | |
ced22070 | 354 | mutex_unlock(&f->sem); |
5451f79f DH |
355 | jffs2_do_clear_inode(c, f); |
356 | iget_failed(inode); | |
357 | return ERR_PTR(ret); | |
1da177e4 LT |
358 | } |
359 | ||
aa385729 | 360 | void jffs2_dirty_inode(struct inode *inode, int flags) |
1da177e4 LT |
361 | { |
362 | struct iattr iattr; | |
363 | ||
364 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { | |
365 | D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino)); | |
366 | return; | |
367 | } | |
368 | ||
369 | D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino)); | |
370 | ||
371 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; | |
372 | iattr.ia_mode = inode->i_mode; | |
373 | iattr.ia_uid = inode->i_uid; | |
374 | iattr.ia_gid = inode->i_gid; | |
375 | iattr.ia_atime = inode->i_atime; | |
376 | iattr.ia_mtime = inode->i_mtime; | |
377 | iattr.ia_ctime = inode->i_ctime; | |
378 | ||
379 | jffs2_do_setattr(inode, &iattr); | |
380 | } | |
381 | ||
92abc475 | 382 | int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data) |
1da177e4 LT |
383 | { |
384 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
385 | ||
386 | if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) | |
387 | return -EROFS; | |
388 | ||
389 | /* We stop if it was running, then restart if it needs to. | |
390 | This also catches the case where it was stopped and this | |
391 | is just a remount to restart it. | |
392 | Flush the writebuffer, if neccecary, else we loose it */ | |
393 | if (!(sb->s_flags & MS_RDONLY)) { | |
394 | jffs2_stop_garbage_collect_thread(c); | |
ced22070 | 395 | mutex_lock(&c->alloc_sem); |
1da177e4 | 396 | jffs2_flush_wbuf_pad(c); |
ced22070 | 397 | mutex_unlock(&c->alloc_sem); |
182ec4ee | 398 | } |
1da177e4 LT |
399 | |
400 | if (!(*flags & MS_RDONLY)) | |
401 | jffs2_start_garbage_collect_thread(c); | |
182ec4ee | 402 | |
1da177e4 | 403 | *flags |= MS_NOATIME; |
1da177e4 LT |
404 | return 0; |
405 | } | |
406 | ||
1da177e4 LT |
407 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, |
408 | fill in the raw_inode while you're at it. */ | |
d3fb6120 | 409 | struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri) |
1da177e4 LT |
410 | { |
411 | struct inode *inode; | |
412 | struct super_block *sb = dir_i->i_sb; | |
413 | struct jffs2_sb_info *c; | |
414 | struct jffs2_inode_info *f; | |
415 | int ret; | |
416 | ||
417 | D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode)); | |
418 | ||
419 | c = JFFS2_SB_INFO(sb); | |
182ec4ee | 420 | |
1da177e4 | 421 | inode = new_inode(sb); |
182ec4ee | 422 | |
1da177e4 LT |
423 | if (!inode) |
424 | return ERR_PTR(-ENOMEM); | |
425 | ||
426 | f = JFFS2_INODE_INFO(inode); | |
427 | jffs2_init_inode_info(f); | |
ced22070 | 428 | mutex_lock(&f->sem); |
1da177e4 LT |
429 | |
430 | memset(ri, 0, sizeof(*ri)); | |
431 | /* Set OS-specific defaults for new inodes */ | |
3fc678a0 | 432 | ri->uid = cpu_to_je16(current_fsuid()); |
1da177e4 LT |
433 | |
434 | if (dir_i->i_mode & S_ISGID) { | |
435 | ri->gid = cpu_to_je16(dir_i->i_gid); | |
436 | if (S_ISDIR(mode)) | |
437 | mode |= S_ISGID; | |
438 | } else { | |
3fc678a0 | 439 | ri->gid = cpu_to_je16(current_fsgid()); |
1da177e4 | 440 | } |
9ed437c5 DW |
441 | |
442 | /* POSIX ACLs have to be processed now, at least partly. | |
443 | The umask is only applied if there's no default ACL */ | |
cfc8dc6f KK |
444 | ret = jffs2_init_acl_pre(dir_i, inode, &mode); |
445 | if (ret) { | |
446 | make_bad_inode(inode); | |
447 | iput(inode); | |
448 | return ERR_PTR(ret); | |
9ed437c5 | 449 | } |
1da177e4 LT |
450 | ret = jffs2_do_new_inode (c, f, mode, ri); |
451 | if (ret) { | |
452 | make_bad_inode(inode); | |
453 | iput(inode); | |
454 | return ERR_PTR(ret); | |
455 | } | |
bfe86848 | 456 | set_nlink(inode, 1); |
1da177e4 LT |
457 | inode->i_ino = je32_to_cpu(ri->ino); |
458 | inode->i_mode = jemode_to_cpu(ri->mode); | |
459 | inode->i_gid = je16_to_cpu(ri->gid); | |
460 | inode->i_uid = je16_to_cpu(ri->uid); | |
461 | inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; | |
462 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); | |
463 | ||
1da177e4 LT |
464 | inode->i_blocks = 0; |
465 | inode->i_size = 0; | |
466 | ||
e72e6497 DW |
467 | if (insert_inode_locked(inode) < 0) { |
468 | make_bad_inode(inode); | |
e72e6497 DW |
469 | iput(inode); |
470 | return ERR_PTR(-EINVAL); | |
471 | } | |
1da177e4 LT |
472 | |
473 | return inode; | |
474 | } | |
475 | ||
65e5a0e1 DD |
476 | static int calculate_inocache_hashsize(uint32_t flash_size) |
477 | { | |
478 | /* | |
479 | * Pick a inocache hash size based on the size of the medium. | |
480 | * Count how many megabytes we're dealing with, apply a hashsize twice | |
481 | * that size, but rounding down to the usual big powers of 2. And keep | |
482 | * to sensible bounds. | |
483 | */ | |
484 | ||
485 | int size_mb = flash_size / 1024 / 1024; | |
486 | int hashsize = (size_mb * 2) & ~0x3f; | |
487 | ||
488 | if (hashsize < INOCACHE_HASHSIZE_MIN) | |
489 | return INOCACHE_HASHSIZE_MIN; | |
490 | if (hashsize > INOCACHE_HASHSIZE_MAX) | |
491 | return INOCACHE_HASHSIZE_MAX; | |
492 | ||
493 | return hashsize; | |
494 | } | |
1da177e4 LT |
495 | |
496 | int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) | |
497 | { | |
498 | struct jffs2_sb_info *c; | |
499 | struct inode *root_i; | |
500 | int ret; | |
501 | size_t blocks; | |
502 | ||
503 | c = JFFS2_SB_INFO(sb); | |
504 | ||
2f82ce1e | 505 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
506 | if (c->mtd->type == MTD_NANDFLASH) { |
507 | printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n"); | |
508 | return -EINVAL; | |
509 | } | |
8f15fd55 AV |
510 | if (c->mtd->type == MTD_DATAFLASH) { |
511 | printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n"); | |
512 | return -EINVAL; | |
513 | } | |
514 | #endif | |
1da177e4 LT |
515 | |
516 | c->flash_size = c->mtd->size; | |
182ec4ee | 517 | c->sector_size = c->mtd->erasesize; |
1da177e4 | 518 | blocks = c->flash_size / c->sector_size; |
1da177e4 LT |
519 | |
520 | /* | |
521 | * Size alignment check | |
522 | */ | |
523 | if ((c->sector_size * blocks) != c->flash_size) { | |
182ec4ee | 524 | c->flash_size = c->sector_size * blocks; |
1da177e4 LT |
525 | printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n", |
526 | c->flash_size / 1024); | |
527 | } | |
528 | ||
1da177e4 LT |
529 | if (c->flash_size < 5*c->sector_size) { |
530 | printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size); | |
531 | return -EINVAL; | |
532 | } | |
533 | ||
534 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); | |
1da177e4 LT |
535 | |
536 | /* NAND (or other bizarre) flash... do setup accordingly */ | |
537 | ret = jffs2_flash_setup(c); | |
538 | if (ret) | |
539 | return ret; | |
540 | ||
65e5a0e1 DD |
541 | c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size); |
542 | c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); | |
1da177e4 LT |
543 | if (!c->inocache_list) { |
544 | ret = -ENOMEM; | |
545 | goto out_wbuf; | |
546 | } | |
1da177e4 | 547 | |
aa98d7cf KK |
548 | jffs2_init_xattr_subsystem(c); |
549 | ||
1da177e4 LT |
550 | if ((ret = jffs2_do_mount_fs(c))) |
551 | goto out_inohash; | |
552 | ||
1da177e4 | 553 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n")); |
5451f79f DH |
554 | root_i = jffs2_iget(sb, 1); |
555 | if (IS_ERR(root_i)) { | |
1da177e4 | 556 | D1(printk(KERN_WARNING "get root inode failed\n")); |
5451f79f DH |
557 | ret = PTR_ERR(root_i); |
558 | goto out_root; | |
1da177e4 LT |
559 | } |
560 | ||
5451f79f DH |
561 | ret = -ENOMEM; |
562 | ||
1da177e4 LT |
563 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n")); |
564 | sb->s_root = d_alloc_root(root_i); | |
565 | if (!sb->s_root) | |
566 | goto out_root_i; | |
567 | ||
1da177e4 | 568 | sb->s_maxbytes = 0xFFFFFFFF; |
1da177e4 LT |
569 | sb->s_blocksize = PAGE_CACHE_SIZE; |
570 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
571 | sb->s_magic = JFFS2_SUPER_MAGIC; | |
572 | if (!(sb->s_flags & MS_RDONLY)) | |
573 | jffs2_start_garbage_collect_thread(c); | |
574 | return 0; | |
575 | ||
576 | out_root_i: | |
577 | iput(root_i); | |
5451f79f | 578 | out_root: |
1da177e4 LT |
579 | jffs2_free_ino_caches(c); |
580 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 581 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
582 | vfree(c->blocks); |
583 | else | |
584 | kfree(c->blocks); | |
585 | out_inohash: | |
aa98d7cf | 586 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
587 | kfree(c->inocache_list); |
588 | out_wbuf: | |
589 | jffs2_flash_cleanup(c); | |
590 | ||
591 | return ret; | |
592 | } | |
593 | ||
594 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, | |
595 | struct jffs2_inode_info *f) | |
596 | { | |
597 | iput(OFNI_EDONI_2SFFJ(f)); | |
598 | } | |
599 | ||
600 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, | |
1b690b48 | 601 | int inum, int unlinked) |
1da177e4 LT |
602 | { |
603 | struct inode *inode; | |
604 | struct jffs2_inode_cache *ic; | |
1b690b48 DW |
605 | |
606 | if (unlinked) { | |
1da177e4 | 607 | /* The inode has zero nlink but its nodes weren't yet marked |
182ec4ee | 608 | obsolete. This has to be because we're still waiting for |
1da177e4 LT |
609 | the final (close() and) iput() to happen. |
610 | ||
182ec4ee | 611 | There's a possibility that the final iput() could have |
1da177e4 LT |
612 | happened while we were contemplating. In order to ensure |
613 | that we don't cause a new read_inode() (which would fail) | |
614 | for the inode in question, we use ilookup() in this case | |
615 | instead of iget(). | |
616 | ||
182ec4ee | 617 | The nlink can't _become_ zero at this point because we're |
1da177e4 LT |
618 | holding the alloc_sem, and jffs2_do_unlink() would also |
619 | need that while decrementing nlink on any inode. | |
620 | */ | |
621 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); | |
622 | if (!inode) { | |
623 | D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n", | |
624 | inum)); | |
625 | ||
626 | spin_lock(&c->inocache_lock); | |
627 | ic = jffs2_get_ino_cache(c, inum); | |
628 | if (!ic) { | |
629 | D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum)); | |
630 | spin_unlock(&c->inocache_lock); | |
631 | return NULL; | |
632 | } | |
633 | if (ic->state != INO_STATE_CHECKEDABSENT) { | |
634 | /* Wait for progress. Don't just loop */ | |
635 | D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n", | |
636 | ic->ino, ic->state)); | |
637 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); | |
638 | } else { | |
639 | spin_unlock(&c->inocache_lock); | |
640 | } | |
641 | ||
642 | return NULL; | |
643 | } | |
644 | } else { | |
645 | /* Inode has links to it still; they're not going away because | |
646 | jffs2_do_unlink() would need the alloc_sem and we have it. | |
647 | Just iget() it, and if read_inode() is necessary that's OK. | |
648 | */ | |
5451f79f DH |
649 | inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); |
650 | if (IS_ERR(inode)) | |
651 | return ERR_CAST(inode); | |
1da177e4 LT |
652 | } |
653 | if (is_bad_inode(inode)) { | |
1b690b48 DW |
654 | printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. unlinked %d\n", |
655 | inum, unlinked); | |
1da177e4 LT |
656 | /* NB. This will happen again. We need to do something appropriate here. */ |
657 | iput(inode); | |
658 | return ERR_PTR(-EIO); | |
659 | } | |
660 | ||
661 | return JFFS2_INODE_INFO(inode); | |
662 | } | |
663 | ||
182ec4ee TG |
664 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
665 | struct jffs2_inode_info *f, | |
1da177e4 LT |
666 | unsigned long offset, |
667 | unsigned long *priv) | |
668 | { | |
669 | struct inode *inode = OFNI_EDONI_2SFFJ(f); | |
670 | struct page *pg; | |
671 | ||
fc0e0197 | 672 | pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
1da177e4 LT |
673 | (void *)jffs2_do_readpage_unlock, inode); |
674 | if (IS_ERR(pg)) | |
675 | return (void *)pg; | |
182ec4ee | 676 | |
1da177e4 LT |
677 | *priv = (unsigned long)pg; |
678 | return kmap(pg); | |
679 | } | |
680 | ||
681 | void jffs2_gc_release_page(struct jffs2_sb_info *c, | |
682 | unsigned char *ptr, | |
683 | unsigned long *priv) | |
684 | { | |
685 | struct page *pg = (void *)*priv; | |
686 | ||
687 | kunmap(pg); | |
688 | page_cache_release(pg); | |
689 | } | |
690 | ||
691 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { | |
692 | int ret = 0; | |
182ec4ee | 693 | |
1da177e4 LT |
694 | if (jffs2_cleanmarker_oob(c)) { |
695 | /* NAND flash... do setup accordingly */ | |
696 | ret = jffs2_nand_flash_setup(c); | |
697 | if (ret) | |
698 | return ret; | |
699 | } | |
700 | ||
8f15fd55 AV |
701 | /* and Dataflash */ |
702 | if (jffs2_dataflash(c)) { | |
703 | ret = jffs2_dataflash_setup(c); | |
704 | if (ret) | |
705 | return ret; | |
706 | } | |
59da721a NP |
707 | |
708 | /* and Intel "Sibley" flash */ | |
709 | if (jffs2_nor_wbuf_flash(c)) { | |
710 | ret = jffs2_nor_wbuf_flash_setup(c); | |
711 | if (ret) | |
712 | return ret; | |
713 | } | |
714 | ||
0029da3b AB |
715 | /* and an UBI volume */ |
716 | if (jffs2_ubivol(c)) { | |
717 | ret = jffs2_ubivol_setup(c); | |
718 | if (ret) | |
719 | return ret; | |
720 | } | |
721 | ||
1da177e4 LT |
722 | return ret; |
723 | } | |
724 | ||
725 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { | |
726 | ||
727 | if (jffs2_cleanmarker_oob(c)) { | |
728 | jffs2_nand_flash_cleanup(c); | |
729 | } | |
730 | ||
8f15fd55 AV |
731 | /* and DataFlash */ |
732 | if (jffs2_dataflash(c)) { | |
733 | jffs2_dataflash_cleanup(c); | |
734 | } | |
59da721a NP |
735 | |
736 | /* and Intel "Sibley" flash */ | |
737 | if (jffs2_nor_wbuf_flash(c)) { | |
738 | jffs2_nor_wbuf_flash_cleanup(c); | |
739 | } | |
0029da3b AB |
740 | |
741 | /* and an UBI volume */ | |
742 | if (jffs2_ubivol(c)) { | |
743 | jffs2_ubivol_cleanup(c); | |
744 | } | |
1da177e4 | 745 | } |