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 | ||
5a528957 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
16f7e0fe | 15 | #include <linux/capability.h> |
1da177e4 LT |
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 | ||
9ed437c5 | 30 | int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) |
1da177e4 LT |
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 | 41 | int ret; |
dd919660 | 42 | int alloc_type = ALLOC_NORMAL; |
9ed437c5 | 43 | |
9c261b33 | 44 | jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino); |
1da177e4 LT |
45 | |
46 | /* Special cases - we don't want more than one data node | |
47 | for these types on the medium at any time. So setattr | |
48 | must read the original data associated with the node | |
49 | (i.e. the device numbers or the target name) and write | |
50 | it out again with the appropriate data attached */ | |
51 | if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { | |
52 | /* For these, we don't actually need to read the old node */ | |
aef9ab47 | 53 | mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); |
1da177e4 | 54 | mdata = (char *)&dev; |
9c261b33 JP |
55 | jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n", |
56 | __func__, mdatalen); | |
1da177e4 | 57 | } else if (S_ISLNK(inode->i_mode)) { |
ced22070 | 58 | mutex_lock(&f->sem); |
1da177e4 LT |
59 | mdatalen = f->metadata->size; |
60 | mdata = kmalloc(f->metadata->size, GFP_USER); | |
422138dd | 61 | if (!mdata) { |
ced22070 | 62 | mutex_unlock(&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) { | |
ced22070 | 67 | mutex_unlock(&f->sem); |
1da177e4 LT |
68 | kfree(mdata); |
69 | return ret; | |
70 | } | |
ced22070 | 71 | mutex_unlock(&f->sem); |
9c261b33 JP |
72 | jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n", |
73 | __func__, mdatalen); | |
1da177e4 LT |
74 | } |
75 | ||
76 | ri = jffs2_alloc_raw_inode(); | |
77 | if (!ri) { | |
78 | if (S_ISLNK(inode->i_mode)) | |
79 | kfree(mdata); | |
80 | return -ENOMEM; | |
81 | } | |
182ec4ee | 82 | |
9fe4854c DW |
83 | ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, |
84 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
85 | if (ret) { |
86 | jffs2_free_raw_inode(ri); | |
61effb51 | 87 | if (S_ISLNK(inode->i_mode)) |
1da177e4 LT |
88 | kfree(mdata); |
89 | return ret; | |
90 | } | |
ced22070 | 91 | mutex_lock(&f->sem); |
1da177e4 | 92 | ivalid = iattr->ia_valid; |
182ec4ee | 93 | |
1da177e4 LT |
94 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
95 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
96 | ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); | |
97 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
98 | ||
99 | ri->ino = cpu_to_je32(inode->i_ino); | |
100 | ri->version = cpu_to_je32(++f->highest_version); | |
101 | ||
0cfe53d3 EB |
102 | ri->uid = cpu_to_je16((ivalid & ATTR_UID)? |
103 | from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode)); | |
104 | ri->gid = cpu_to_je16((ivalid & ATTR_GID)? | |
105 | from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode)); | |
1da177e4 LT |
106 | |
107 | if (ivalid & ATTR_MODE) | |
857013b8 | 108 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
1da177e4 LT |
109 | else |
110 | ri->mode = cpu_to_jemode(inode->i_mode); | |
111 | ||
112 | ||
113 | ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); | |
114 | ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); | |
115 | ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); | |
116 | ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); | |
117 | ||
118 | ri->offset = cpu_to_je32(0); | |
119 | ri->csize = ri->dsize = cpu_to_je32(mdatalen); | |
120 | ri->compr = JFFS2_COMPR_NONE; | |
121 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
122 | /* It's an extension. Make it a hole node */ | |
123 | ri->compr = JFFS2_COMPR_ZERO; | |
124 | ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); | |
125 | ri->offset = cpu_to_je32(inode->i_size); | |
dd919660 DW |
126 | } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { |
127 | /* For truncate-to-zero, treat it as deletion because | |
128 | it'll always be obsoleting all previous nodes */ | |
129 | alloc_type = ALLOC_DELETION; | |
1da177e4 LT |
130 | } |
131 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
132 | if (mdatalen) | |
133 | ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); | |
134 | else | |
135 | ri->data_crc = cpu_to_je32(0); | |
136 | ||
dd919660 | 137 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); |
1da177e4 LT |
138 | if (S_ISLNK(inode->i_mode)) |
139 | kfree(mdata); | |
182ec4ee | 140 | |
1da177e4 LT |
141 | if (IS_ERR(new_metadata)) { |
142 | jffs2_complete_reservation(c); | |
143 | jffs2_free_raw_inode(ri); | |
ced22070 | 144 | mutex_unlock(&f->sem); |
1da177e4 LT |
145 | return PTR_ERR(new_metadata); |
146 | } | |
147 | /* It worked. Update the inode */ | |
148 | inode->i_atime = ITIME(je32_to_cpu(ri->atime)); | |
149 | inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
150 | inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); | |
151 | inode->i_mode = jemode_to_cpu(ri->mode); | |
0cfe53d3 EB |
152 | i_uid_write(inode, je16_to_cpu(ri->uid)); |
153 | i_gid_write(inode, je16_to_cpu(ri->gid)); | |
1da177e4 LT |
154 | |
155 | ||
156 | old_metadata = f->metadata; | |
157 | ||
158 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
f302cd02 | 159 | jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
1da177e4 LT |
160 | |
161 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
162 | jffs2_add_full_dnode_to_inode(c, f, new_metadata); | |
163 | inode->i_size = iattr->ia_size; | |
b28ba9fa | 164 | inode->i_blocks = (inode->i_size + 511) >> 9; |
1da177e4 LT |
165 | f->metadata = NULL; |
166 | } else { | |
167 | f->metadata = new_metadata; | |
168 | } | |
169 | if (old_metadata) { | |
170 | jffs2_mark_node_obsolete(c, old_metadata->raw); | |
171 | jffs2_free_full_dnode(old_metadata); | |
172 | } | |
173 | jffs2_free_raw_inode(ri); | |
174 | ||
ced22070 | 175 | mutex_unlock(&f->sem); |
1da177e4 LT |
176 | jffs2_complete_reservation(c); |
177 | ||
2c27c65e | 178 | /* We have to do the truncate_setsize() without f->sem held, since |
182ec4ee | 179 | some pages may be locked and waiting for it in readpage(). |
1da177e4 LT |
180 | We are protected from a simultaneous write() extending i_size |
181 | back past iattr->ia_size, because do_truncate() holds the | |
182 | generic inode semaphore. */ | |
b28ba9fa | 183 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { |
2c27c65e | 184 | truncate_setsize(inode, iattr->ia_size); |
b28ba9fa DW |
185 | inode->i_blocks = (inode->i_size + 511) >> 9; |
186 | } | |
1da177e4 LT |
187 | |
188 | return 0; | |
189 | } | |
190 | ||
191 | int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) | |
192 | { | |
aa98d7cf KK |
193 | int rc; |
194 | ||
9ed437c5 DW |
195 | rc = inode_change_ok(dentry->d_inode, iattr); |
196 | if (rc) | |
197 | return rc; | |
198 | ||
aa98d7cf KK |
199 | rc = jffs2_do_setattr(dentry->d_inode, iattr); |
200 | if (!rc && (iattr->ia_valid & ATTR_MODE)) | |
201 | rc = jffs2_acl_chmod(dentry->d_inode); | |
9ed437c5 | 202 | |
aa98d7cf | 203 | return rc; |
1da177e4 LT |
204 | } |
205 | ||
726c3342 | 206 | int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 207 | { |
726c3342 | 208 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
1da177e4 LT |
209 | unsigned long avail; |
210 | ||
211 | buf->f_type = JFFS2_SUPER_MAGIC; | |
212 | buf->f_bsize = 1 << PAGE_SHIFT; | |
213 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; | |
214 | buf->f_files = 0; | |
215 | buf->f_ffree = 0; | |
216 | buf->f_namelen = JFFS2_MAX_NAME_LEN; | |
75caf6b5 DW |
217 | buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; |
218 | buf->f_fsid.val[1] = c->mtd->index; | |
1da177e4 LT |
219 | |
220 | spin_lock(&c->erase_completion_lock); | |
1da177e4 LT |
221 | avail = c->dirty_size + c->free_size; |
222 | if (avail > c->sector_size * c->resv_blocks_write) | |
223 | avail -= c->sector_size * c->resv_blocks_write; | |
224 | else | |
225 | avail = 0; | |
e0c8e42f | 226 | spin_unlock(&c->erase_completion_lock); |
1da177e4 LT |
227 | |
228 | buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; | |
229 | ||
1da177e4 LT |
230 | return 0; |
231 | } | |
232 | ||
233 | ||
b57922d9 | 234 | void jffs2_evict_inode (struct inode *inode) |
1da177e4 | 235 | { |
182ec4ee | 236 | /* We can forget about this inode for now - drop all |
1da177e4 LT |
237 | * the nodelists associated with it, etc. |
238 | */ | |
239 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
240 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
182ec4ee | 241 | |
9c261b33 JP |
242 | jffs2_dbg(1, "%s(): ino #%lu mode %o\n", |
243 | __func__, inode->i_ino, inode->i_mode); | |
b57922d9 | 244 | truncate_inode_pages(&inode->i_data, 0); |
dbd5768f | 245 | clear_inode(inode); |
1da177e4 LT |
246 | jffs2_do_clear_inode(c, f); |
247 | } | |
248 | ||
5451f79f | 249 | struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
250 | { |
251 | struct jffs2_inode_info *f; | |
252 | struct jffs2_sb_info *c; | |
253 | struct jffs2_raw_inode latest_node; | |
aef9ab47 | 254 | union jffs2_device_node jdev; |
5451f79f | 255 | struct inode *inode; |
aef9ab47 | 256 | dev_t rdev = 0; |
1da177e4 LT |
257 | int ret; |
258 | ||
9c261b33 | 259 | jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino); |
5451f79f DH |
260 | |
261 | inode = iget_locked(sb, ino); | |
262 | if (!inode) | |
263 | return ERR_PTR(-ENOMEM); | |
264 | if (!(inode->i_state & I_NEW)) | |
265 | return inode; | |
1da177e4 LT |
266 | |
267 | f = JFFS2_INODE_INFO(inode); | |
268 | c = JFFS2_SB_INFO(inode->i_sb); | |
269 | ||
270 | jffs2_init_inode_info(f); | |
ced22070 | 271 | mutex_lock(&f->sem); |
182ec4ee | 272 | |
1da177e4 LT |
273 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
274 | ||
275 | if (ret) { | |
ced22070 | 276 | mutex_unlock(&f->sem); |
5451f79f DH |
277 | iget_failed(inode); |
278 | return ERR_PTR(ret); | |
1da177e4 LT |
279 | } |
280 | inode->i_mode = jemode_to_cpu(latest_node.mode); | |
0cfe53d3 EB |
281 | i_uid_write(inode, je16_to_cpu(latest_node.uid)); |
282 | i_gid_write(inode, je16_to_cpu(latest_node.gid)); | |
1da177e4 LT |
283 | inode->i_size = je32_to_cpu(latest_node.isize); |
284 | inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); | |
285 | inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); | |
286 | inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); | |
287 | ||
bfe86848 | 288 | set_nlink(inode, f->inocache->pino_nlink); |
1da177e4 | 289 | |
1da177e4 | 290 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 291 | |
1da177e4 | 292 | switch (inode->i_mode & S_IFMT) { |
1da177e4 LT |
293 | |
294 | case S_IFLNK: | |
295 | inode->i_op = &jffs2_symlink_inode_operations; | |
296 | break; | |
182ec4ee | 297 | |
1da177e4 LT |
298 | case S_IFDIR: |
299 | { | |
300 | struct jffs2_full_dirent *fd; | |
bfe86848 | 301 | set_nlink(inode, 2); /* parent and '.' */ |
1da177e4 LT |
302 | |
303 | for (fd=f->dents; fd; fd = fd->next) { | |
304 | if (fd->type == DT_DIR && fd->ino) | |
d8c76e6f | 305 | inc_nlink(inode); |
1da177e4 | 306 | } |
1da177e4 LT |
307 | /* Root dir gets i_nlink 3 for some reason */ |
308 | if (inode->i_ino == 1) | |
d8c76e6f | 309 | inc_nlink(inode); |
1da177e4 LT |
310 | |
311 | inode->i_op = &jffs2_dir_inode_operations; | |
312 | inode->i_fop = &jffs2_dir_operations; | |
313 | break; | |
314 | } | |
315 | case S_IFREG: | |
316 | inode->i_op = &jffs2_file_inode_operations; | |
317 | inode->i_fop = &jffs2_file_operations; | |
318 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
319 | inode->i_mapping->nrpages = 0; | |
320 | break; | |
321 | ||
322 | case S_IFBLK: | |
323 | case S_IFCHR: | |
324 | /* Read the device numbers from the media */ | |
91f80266 AM |
325 | if (f->metadata->size != sizeof(jdev.old_id) && |
326 | f->metadata->size != sizeof(jdev.new_id)) { | |
da320f05 JP |
327 | pr_notice("Device node has strange size %d\n", |
328 | f->metadata->size); | |
5451f79f | 329 | goto error_io; |
aef9ab47 | 330 | } |
9c261b33 | 331 | jffs2_dbg(1, "Reading device numbers from flash\n"); |
5451f79f DH |
332 | ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); |
333 | if (ret < 0) { | |
1da177e4 | 334 | /* Eep */ |
da320f05 JP |
335 | pr_notice("Read device numbers for inode %lu failed\n", |
336 | (unsigned long)inode->i_ino); | |
5451f79f | 337 | goto error; |
182ec4ee | 338 | } |
91f80266 AM |
339 | if (f->metadata->size == sizeof(jdev.old_id)) |
340 | rdev = old_decode_dev(je16_to_cpu(jdev.old_id)); | |
aef9ab47 | 341 | else |
91f80266 | 342 | rdev = new_decode_dev(je32_to_cpu(jdev.new_id)); |
1da177e4 LT |
343 | |
344 | case S_IFSOCK: | |
345 | case S_IFIFO: | |
346 | inode->i_op = &jffs2_file_inode_operations; | |
aef9ab47 | 347 | init_special_inode(inode, inode->i_mode, rdev); |
1da177e4 LT |
348 | break; |
349 | ||
350 | default: | |
da320f05 JP |
351 | pr_warn("%s(): Bogus i_mode %o for ino %lu\n", |
352 | __func__, inode->i_mode, (unsigned long)inode->i_ino); | |
1da177e4 LT |
353 | } |
354 | ||
ced22070 | 355 | mutex_unlock(&f->sem); |
1da177e4 | 356 | |
9c261b33 | 357 | jffs2_dbg(1, "jffs2_read_inode() returning\n"); |
5451f79f DH |
358 | unlock_new_inode(inode); |
359 | return inode; | |
360 | ||
361 | error_io: | |
362 | ret = -EIO; | |
363 | error: | |
ced22070 | 364 | mutex_unlock(&f->sem); |
5451f79f DH |
365 | jffs2_do_clear_inode(c, f); |
366 | iget_failed(inode); | |
367 | return ERR_PTR(ret); | |
1da177e4 LT |
368 | } |
369 | ||
aa385729 | 370 | void jffs2_dirty_inode(struct inode *inode, int flags) |
1da177e4 LT |
371 | { |
372 | struct iattr iattr; | |
373 | ||
374 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { | |
9c261b33 JP |
375 | jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n", |
376 | __func__, inode->i_ino); | |
1da177e4 LT |
377 | return; |
378 | } | |
379 | ||
9c261b33 JP |
380 | jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n", |
381 | __func__, inode->i_ino); | |
1da177e4 LT |
382 | |
383 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; | |
384 | iattr.ia_mode = inode->i_mode; | |
385 | iattr.ia_uid = inode->i_uid; | |
386 | iattr.ia_gid = inode->i_gid; | |
387 | iattr.ia_atime = inode->i_atime; | |
388 | iattr.ia_mtime = inode->i_mtime; | |
389 | iattr.ia_ctime = inode->i_ctime; | |
390 | ||
391 | jffs2_do_setattr(inode, &iattr); | |
392 | } | |
393 | ||
92abc475 | 394 | int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data) |
1da177e4 LT |
395 | { |
396 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
397 | ||
398 | if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) | |
399 | return -EROFS; | |
400 | ||
401 | /* We stop if it was running, then restart if it needs to. | |
402 | This also catches the case where it was stopped and this | |
403 | is just a remount to restart it. | |
404 | Flush the writebuffer, if neccecary, else we loose it */ | |
405 | if (!(sb->s_flags & MS_RDONLY)) { | |
406 | jffs2_stop_garbage_collect_thread(c); | |
ced22070 | 407 | mutex_lock(&c->alloc_sem); |
1da177e4 | 408 | jffs2_flush_wbuf_pad(c); |
ced22070 | 409 | mutex_unlock(&c->alloc_sem); |
182ec4ee | 410 | } |
1da177e4 LT |
411 | |
412 | if (!(*flags & MS_RDONLY)) | |
413 | jffs2_start_garbage_collect_thread(c); | |
182ec4ee | 414 | |
1da177e4 | 415 | *flags |= MS_NOATIME; |
1da177e4 LT |
416 | return 0; |
417 | } | |
418 | ||
1da177e4 LT |
419 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, |
420 | fill in the raw_inode while you're at it. */ | |
d3fb6120 | 421 | struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri) |
1da177e4 LT |
422 | { |
423 | struct inode *inode; | |
424 | struct super_block *sb = dir_i->i_sb; | |
425 | struct jffs2_sb_info *c; | |
426 | struct jffs2_inode_info *f; | |
427 | int ret; | |
428 | ||
9c261b33 JP |
429 | jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n", |
430 | __func__, dir_i->i_ino, mode); | |
1da177e4 LT |
431 | |
432 | c = JFFS2_SB_INFO(sb); | |
182ec4ee | 433 | |
1da177e4 | 434 | inode = new_inode(sb); |
182ec4ee | 435 | |
1da177e4 LT |
436 | if (!inode) |
437 | return ERR_PTR(-ENOMEM); | |
438 | ||
439 | f = JFFS2_INODE_INFO(inode); | |
440 | jffs2_init_inode_info(f); | |
ced22070 | 441 | mutex_lock(&f->sem); |
1da177e4 LT |
442 | |
443 | memset(ri, 0, sizeof(*ri)); | |
444 | /* Set OS-specific defaults for new inodes */ | |
0cfe53d3 | 445 | ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid())); |
1da177e4 LT |
446 | |
447 | if (dir_i->i_mode & S_ISGID) { | |
0cfe53d3 | 448 | ri->gid = cpu_to_je16(i_gid_read(dir_i)); |
1da177e4 LT |
449 | if (S_ISDIR(mode)) |
450 | mode |= S_ISGID; | |
451 | } else { | |
0cfe53d3 | 452 | ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid())); |
1da177e4 | 453 | } |
9ed437c5 DW |
454 | |
455 | /* POSIX ACLs have to be processed now, at least partly. | |
456 | The umask is only applied if there's no default ACL */ | |
cfc8dc6f KK |
457 | ret = jffs2_init_acl_pre(dir_i, inode, &mode); |
458 | if (ret) { | |
459 | make_bad_inode(inode); | |
460 | iput(inode); | |
461 | return ERR_PTR(ret); | |
9ed437c5 | 462 | } |
1da177e4 LT |
463 | ret = jffs2_do_new_inode (c, f, mode, ri); |
464 | if (ret) { | |
465 | make_bad_inode(inode); | |
466 | iput(inode); | |
467 | return ERR_PTR(ret); | |
468 | } | |
bfe86848 | 469 | set_nlink(inode, 1); |
1da177e4 LT |
470 | inode->i_ino = je32_to_cpu(ri->ino); |
471 | inode->i_mode = jemode_to_cpu(ri->mode); | |
0cfe53d3 EB |
472 | i_gid_write(inode, je16_to_cpu(ri->gid)); |
473 | i_uid_write(inode, je16_to_cpu(ri->uid)); | |
1da177e4 LT |
474 | inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; |
475 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); | |
476 | ||
1da177e4 LT |
477 | inode->i_blocks = 0; |
478 | inode->i_size = 0; | |
479 | ||
e72e6497 DW |
480 | if (insert_inode_locked(inode) < 0) { |
481 | make_bad_inode(inode); | |
e72e6497 DW |
482 | iput(inode); |
483 | return ERR_PTR(-EINVAL); | |
484 | } | |
1da177e4 LT |
485 | |
486 | return inode; | |
487 | } | |
488 | ||
65e5a0e1 DD |
489 | static int calculate_inocache_hashsize(uint32_t flash_size) |
490 | { | |
491 | /* | |
492 | * Pick a inocache hash size based on the size of the medium. | |
493 | * Count how many megabytes we're dealing with, apply a hashsize twice | |
494 | * that size, but rounding down to the usual big powers of 2. And keep | |
495 | * to sensible bounds. | |
496 | */ | |
497 | ||
498 | int size_mb = flash_size / 1024 / 1024; | |
499 | int hashsize = (size_mb * 2) & ~0x3f; | |
500 | ||
501 | if (hashsize < INOCACHE_HASHSIZE_MIN) | |
502 | return INOCACHE_HASHSIZE_MIN; | |
503 | if (hashsize > INOCACHE_HASHSIZE_MAX) | |
504 | return INOCACHE_HASHSIZE_MAX; | |
505 | ||
506 | return hashsize; | |
507 | } | |
1da177e4 LT |
508 | |
509 | int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) | |
510 | { | |
511 | struct jffs2_sb_info *c; | |
512 | struct inode *root_i; | |
513 | int ret; | |
514 | size_t blocks; | |
515 | ||
516 | c = JFFS2_SB_INFO(sb); | |
517 | ||
e104f1e9 HS |
518 | /* Do not support the MLC nand */ |
519 | if (c->mtd->type == MTD_MLCNANDFLASH) | |
520 | return -EINVAL; | |
521 | ||
2f82ce1e | 522 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 523 | if (c->mtd->type == MTD_NANDFLASH) { |
5a528957 | 524 | pr_err("Cannot operate on NAND flash unless jffs2 NAND support is compiled in\n"); |
1da177e4 LT |
525 | return -EINVAL; |
526 | } | |
8f15fd55 | 527 | if (c->mtd->type == MTD_DATAFLASH) { |
5a528957 | 528 | pr_err("Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in\n"); |
8f15fd55 AV |
529 | return -EINVAL; |
530 | } | |
531 | #endif | |
1da177e4 LT |
532 | |
533 | c->flash_size = c->mtd->size; | |
182ec4ee | 534 | c->sector_size = c->mtd->erasesize; |
1da177e4 | 535 | blocks = c->flash_size / c->sector_size; |
1da177e4 LT |
536 | |
537 | /* | |
538 | * Size alignment check | |
539 | */ | |
540 | if ((c->sector_size * blocks) != c->flash_size) { | |
182ec4ee | 541 | c->flash_size = c->sector_size * blocks; |
5a528957 | 542 | pr_info("Flash size not aligned to erasesize, reducing to %dKiB\n", |
1da177e4 LT |
543 | c->flash_size / 1024); |
544 | } | |
545 | ||
1da177e4 | 546 | if (c->flash_size < 5*c->sector_size) { |
5a528957 | 547 | pr_err("Too few erase blocks (%d)\n", |
da320f05 | 548 | c->flash_size / c->sector_size); |
1da177e4 LT |
549 | return -EINVAL; |
550 | } | |
551 | ||
552 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); | |
1da177e4 LT |
553 | |
554 | /* NAND (or other bizarre) flash... do setup accordingly */ | |
555 | ret = jffs2_flash_setup(c); | |
556 | if (ret) | |
557 | return ret; | |
558 | ||
65e5a0e1 DD |
559 | c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size); |
560 | c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); | |
1da177e4 LT |
561 | if (!c->inocache_list) { |
562 | ret = -ENOMEM; | |
563 | goto out_wbuf; | |
564 | } | |
1da177e4 | 565 | |
aa98d7cf KK |
566 | jffs2_init_xattr_subsystem(c); |
567 | ||
1da177e4 LT |
568 | if ((ret = jffs2_do_mount_fs(c))) |
569 | goto out_inohash; | |
570 | ||
9c261b33 | 571 | jffs2_dbg(1, "%s(): Getting root inode\n", __func__); |
5451f79f DH |
572 | root_i = jffs2_iget(sb, 1); |
573 | if (IS_ERR(root_i)) { | |
9c261b33 | 574 | jffs2_dbg(1, "get root inode failed\n"); |
5451f79f DH |
575 | ret = PTR_ERR(root_i); |
576 | goto out_root; | |
1da177e4 LT |
577 | } |
578 | ||
5451f79f DH |
579 | ret = -ENOMEM; |
580 | ||
623ff773 | 581 | jffs2_dbg(1, "%s(): d_make_root()\n", __func__); |
48fde701 | 582 | sb->s_root = d_make_root(root_i); |
1da177e4 | 583 | if (!sb->s_root) |
48fde701 | 584 | goto out_root; |
1da177e4 | 585 | |
1da177e4 | 586 | sb->s_maxbytes = 0xFFFFFFFF; |
1da177e4 LT |
587 | sb->s_blocksize = PAGE_CACHE_SIZE; |
588 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
589 | sb->s_magic = JFFS2_SUPER_MAGIC; | |
590 | if (!(sb->s_flags & MS_RDONLY)) | |
591 | jffs2_start_garbage_collect_thread(c); | |
592 | return 0; | |
593 | ||
5451f79f | 594 | out_root: |
1da177e4 LT |
595 | jffs2_free_ino_caches(c); |
596 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 597 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
598 | vfree(c->blocks); |
599 | else | |
600 | kfree(c->blocks); | |
601 | out_inohash: | |
aa98d7cf | 602 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
603 | kfree(c->inocache_list); |
604 | out_wbuf: | |
605 | jffs2_flash_cleanup(c); | |
606 | ||
607 | return ret; | |
608 | } | |
609 | ||
610 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, | |
611 | struct jffs2_inode_info *f) | |
612 | { | |
613 | iput(OFNI_EDONI_2SFFJ(f)); | |
614 | } | |
615 | ||
616 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, | |
1b690b48 | 617 | int inum, int unlinked) |
1da177e4 LT |
618 | { |
619 | struct inode *inode; | |
620 | struct jffs2_inode_cache *ic; | |
1b690b48 DW |
621 | |
622 | if (unlinked) { | |
1da177e4 | 623 | /* The inode has zero nlink but its nodes weren't yet marked |
182ec4ee | 624 | obsolete. This has to be because we're still waiting for |
1da177e4 LT |
625 | the final (close() and) iput() to happen. |
626 | ||
182ec4ee | 627 | There's a possibility that the final iput() could have |
1da177e4 LT |
628 | happened while we were contemplating. In order to ensure |
629 | that we don't cause a new read_inode() (which would fail) | |
630 | for the inode in question, we use ilookup() in this case | |
631 | instead of iget(). | |
632 | ||
182ec4ee | 633 | The nlink can't _become_ zero at this point because we're |
1da177e4 LT |
634 | holding the alloc_sem, and jffs2_do_unlink() would also |
635 | need that while decrementing nlink on any inode. | |
636 | */ | |
637 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); | |
638 | if (!inode) { | |
9c261b33 JP |
639 | jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n", |
640 | inum); | |
1da177e4 LT |
641 | |
642 | spin_lock(&c->inocache_lock); | |
643 | ic = jffs2_get_ino_cache(c, inum); | |
644 | if (!ic) { | |
9c261b33 JP |
645 | jffs2_dbg(1, "Inode cache for ino #%u is gone\n", |
646 | inum); | |
1da177e4 LT |
647 | spin_unlock(&c->inocache_lock); |
648 | return NULL; | |
649 | } | |
650 | if (ic->state != INO_STATE_CHECKEDABSENT) { | |
651 | /* Wait for progress. Don't just loop */ | |
9c261b33 JP |
652 | jffs2_dbg(1, "Waiting for ino #%u in state %d\n", |
653 | ic->ino, ic->state); | |
1da177e4 LT |
654 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); |
655 | } else { | |
656 | spin_unlock(&c->inocache_lock); | |
657 | } | |
658 | ||
659 | return NULL; | |
660 | } | |
661 | } else { | |
662 | /* Inode has links to it still; they're not going away because | |
663 | jffs2_do_unlink() would need the alloc_sem and we have it. | |
664 | Just iget() it, and if read_inode() is necessary that's OK. | |
665 | */ | |
5451f79f DH |
666 | inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); |
667 | if (IS_ERR(inode)) | |
668 | return ERR_CAST(inode); | |
1da177e4 LT |
669 | } |
670 | if (is_bad_inode(inode)) { | |
da320f05 JP |
671 | pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n", |
672 | inum, unlinked); | |
1da177e4 LT |
673 | /* NB. This will happen again. We need to do something appropriate here. */ |
674 | iput(inode); | |
675 | return ERR_PTR(-EIO); | |
676 | } | |
677 | ||
678 | return JFFS2_INODE_INFO(inode); | |
679 | } | |
680 | ||
182ec4ee TG |
681 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
682 | struct jffs2_inode_info *f, | |
1da177e4 LT |
683 | unsigned long offset, |
684 | unsigned long *priv) | |
685 | { | |
686 | struct inode *inode = OFNI_EDONI_2SFFJ(f); | |
687 | struct page *pg; | |
688 | ||
fc0e0197 | 689 | pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
1da177e4 LT |
690 | (void *)jffs2_do_readpage_unlock, inode); |
691 | if (IS_ERR(pg)) | |
692 | return (void *)pg; | |
182ec4ee | 693 | |
1da177e4 LT |
694 | *priv = (unsigned long)pg; |
695 | return kmap(pg); | |
696 | } | |
697 | ||
698 | void jffs2_gc_release_page(struct jffs2_sb_info *c, | |
699 | unsigned char *ptr, | |
700 | unsigned long *priv) | |
701 | { | |
702 | struct page *pg = (void *)*priv; | |
703 | ||
704 | kunmap(pg); | |
705 | page_cache_release(pg); | |
706 | } | |
707 | ||
708 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { | |
709 | int ret = 0; | |
182ec4ee | 710 | |
1da177e4 LT |
711 | if (jffs2_cleanmarker_oob(c)) { |
712 | /* NAND flash... do setup accordingly */ | |
713 | ret = jffs2_nand_flash_setup(c); | |
714 | if (ret) | |
715 | return ret; | |
716 | } | |
717 | ||
8f15fd55 AV |
718 | /* and Dataflash */ |
719 | if (jffs2_dataflash(c)) { | |
720 | ret = jffs2_dataflash_setup(c); | |
721 | if (ret) | |
722 | return ret; | |
723 | } | |
59da721a NP |
724 | |
725 | /* and Intel "Sibley" flash */ | |
726 | if (jffs2_nor_wbuf_flash(c)) { | |
727 | ret = jffs2_nor_wbuf_flash_setup(c); | |
728 | if (ret) | |
729 | return ret; | |
730 | } | |
731 | ||
0029da3b AB |
732 | /* and an UBI volume */ |
733 | if (jffs2_ubivol(c)) { | |
734 | ret = jffs2_ubivol_setup(c); | |
735 | if (ret) | |
736 | return ret; | |
737 | } | |
738 | ||
1da177e4 LT |
739 | return ret; |
740 | } | |
741 | ||
742 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { | |
743 | ||
744 | if (jffs2_cleanmarker_oob(c)) { | |
745 | jffs2_nand_flash_cleanup(c); | |
746 | } | |
747 | ||
8f15fd55 AV |
748 | /* and DataFlash */ |
749 | if (jffs2_dataflash(c)) { | |
750 | jffs2_dataflash_cleanup(c); | |
751 | } | |
59da721a NP |
752 | |
753 | /* and Intel "Sibley" flash */ | |
754 | if (jffs2_nor_wbuf_flash(c)) { | |
755 | jffs2_nor_wbuf_flash_cleanup(c); | |
756 | } | |
0029da3b AB |
757 | |
758 | /* and an UBI volume */ | |
759 | if (jffs2_ubivol(c)) { | |
760 | jffs2_ubivol_cleanup(c); | |
761 | } | |
1da177e4 | 762 | } |