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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 | ||
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 | { | |
f2963d45 | 193 | struct inode *inode = dentry->d_inode; |
aa98d7cf KK |
194 | int rc; |
195 | ||
f2963d45 | 196 | rc = inode_change_ok(inode, iattr); |
9ed437c5 DW |
197 | if (rc) |
198 | return rc; | |
199 | ||
f2963d45 | 200 | rc = jffs2_do_setattr(inode, iattr); |
aa98d7cf | 201 | if (!rc && (iattr->ia_valid & ATTR_MODE)) |
f2963d45 | 202 | rc = posix_acl_chmod(inode, inode->i_mode); |
9ed437c5 | 203 | |
aa98d7cf | 204 | return rc; |
1da177e4 LT |
205 | } |
206 | ||
726c3342 | 207 | int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 208 | { |
726c3342 | 209 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
1da177e4 LT |
210 | unsigned long avail; |
211 | ||
212 | buf->f_type = JFFS2_SUPER_MAGIC; | |
213 | buf->f_bsize = 1 << PAGE_SHIFT; | |
214 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; | |
215 | buf->f_files = 0; | |
216 | buf->f_ffree = 0; | |
217 | buf->f_namelen = JFFS2_MAX_NAME_LEN; | |
75caf6b5 DW |
218 | buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; |
219 | buf->f_fsid.val[1] = c->mtd->index; | |
1da177e4 LT |
220 | |
221 | spin_lock(&c->erase_completion_lock); | |
1da177e4 LT |
222 | avail = c->dirty_size + c->free_size; |
223 | if (avail > c->sector_size * c->resv_blocks_write) | |
224 | avail -= c->sector_size * c->resv_blocks_write; | |
225 | else | |
226 | avail = 0; | |
e0c8e42f | 227 | spin_unlock(&c->erase_completion_lock); |
1da177e4 LT |
228 | |
229 | buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; | |
230 | ||
1da177e4 LT |
231 | return 0; |
232 | } | |
233 | ||
234 | ||
b57922d9 | 235 | void jffs2_evict_inode (struct inode *inode) |
1da177e4 | 236 | { |
182ec4ee | 237 | /* We can forget about this inode for now - drop all |
1da177e4 LT |
238 | * the nodelists associated with it, etc. |
239 | */ | |
240 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
241 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
182ec4ee | 242 | |
9c261b33 JP |
243 | jffs2_dbg(1, "%s(): ino #%lu mode %o\n", |
244 | __func__, inode->i_ino, inode->i_mode); | |
91b0abe3 | 245 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 246 | clear_inode(inode); |
1da177e4 LT |
247 | jffs2_do_clear_inode(c, f); |
248 | } | |
249 | ||
5451f79f | 250 | struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
251 | { |
252 | struct jffs2_inode_info *f; | |
253 | struct jffs2_sb_info *c; | |
254 | struct jffs2_raw_inode latest_node; | |
aef9ab47 | 255 | union jffs2_device_node jdev; |
5451f79f | 256 | struct inode *inode; |
aef9ab47 | 257 | dev_t rdev = 0; |
1da177e4 LT |
258 | int ret; |
259 | ||
9c261b33 | 260 | jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino); |
5451f79f DH |
261 | |
262 | inode = iget_locked(sb, ino); | |
263 | if (!inode) | |
264 | return ERR_PTR(-ENOMEM); | |
265 | if (!(inode->i_state & I_NEW)) | |
266 | return inode; | |
1da177e4 LT |
267 | |
268 | f = JFFS2_INODE_INFO(inode); | |
269 | c = JFFS2_SB_INFO(inode->i_sb); | |
270 | ||
271 | jffs2_init_inode_info(f); | |
ced22070 | 272 | mutex_lock(&f->sem); |
182ec4ee | 273 | |
1da177e4 LT |
274 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
275 | ||
276 | if (ret) { | |
ced22070 | 277 | mutex_unlock(&f->sem); |
5451f79f DH |
278 | iget_failed(inode); |
279 | return ERR_PTR(ret); | |
1da177e4 LT |
280 | } |
281 | inode->i_mode = jemode_to_cpu(latest_node.mode); | |
0cfe53d3 EB |
282 | i_uid_write(inode, je16_to_cpu(latest_node.uid)); |
283 | i_gid_write(inode, je16_to_cpu(latest_node.gid)); | |
1da177e4 LT |
284 | inode->i_size = je32_to_cpu(latest_node.isize); |
285 | inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); | |
286 | inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); | |
287 | inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); | |
288 | ||
bfe86848 | 289 | set_nlink(inode, f->inocache->pino_nlink); |
1da177e4 | 290 | |
1da177e4 | 291 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 292 | |
1da177e4 | 293 | switch (inode->i_mode & S_IFMT) { |
1da177e4 LT |
294 | |
295 | case S_IFLNK: | |
296 | inode->i_op = &jffs2_symlink_inode_operations; | |
297 | break; | |
182ec4ee | 298 | |
1da177e4 LT |
299 | case S_IFDIR: |
300 | { | |
301 | struct jffs2_full_dirent *fd; | |
bfe86848 | 302 | set_nlink(inode, 2); /* parent and '.' */ |
1da177e4 LT |
303 | |
304 | for (fd=f->dents; fd; fd = fd->next) { | |
305 | if (fd->type == DT_DIR && fd->ino) | |
d8c76e6f | 306 | inc_nlink(inode); |
1da177e4 | 307 | } |
1da177e4 LT |
308 | /* Root dir gets i_nlink 3 for some reason */ |
309 | if (inode->i_ino == 1) | |
d8c76e6f | 310 | inc_nlink(inode); |
1da177e4 LT |
311 | |
312 | inode->i_op = &jffs2_dir_inode_operations; | |
313 | inode->i_fop = &jffs2_dir_operations; | |
314 | break; | |
315 | } | |
316 | case S_IFREG: | |
317 | inode->i_op = &jffs2_file_inode_operations; | |
318 | inode->i_fop = &jffs2_file_operations; | |
319 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
320 | inode->i_mapping->nrpages = 0; | |
321 | break; | |
322 | ||
323 | case S_IFBLK: | |
324 | case S_IFCHR: | |
325 | /* Read the device numbers from the media */ | |
91f80266 AM |
326 | if (f->metadata->size != sizeof(jdev.old_id) && |
327 | f->metadata->size != sizeof(jdev.new_id)) { | |
da320f05 JP |
328 | pr_notice("Device node has strange size %d\n", |
329 | f->metadata->size); | |
5451f79f | 330 | goto error_io; |
aef9ab47 | 331 | } |
9c261b33 | 332 | jffs2_dbg(1, "Reading device numbers from flash\n"); |
5451f79f DH |
333 | ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); |
334 | if (ret < 0) { | |
1da177e4 | 335 | /* Eep */ |
da320f05 JP |
336 | pr_notice("Read device numbers for inode %lu failed\n", |
337 | (unsigned long)inode->i_ino); | |
5451f79f | 338 | goto error; |
182ec4ee | 339 | } |
91f80266 AM |
340 | if (f->metadata->size == sizeof(jdev.old_id)) |
341 | rdev = old_decode_dev(je16_to_cpu(jdev.old_id)); | |
aef9ab47 | 342 | else |
91f80266 | 343 | rdev = new_decode_dev(je32_to_cpu(jdev.new_id)); |
1da177e4 LT |
344 | |
345 | case S_IFSOCK: | |
346 | case S_IFIFO: | |
347 | inode->i_op = &jffs2_file_inode_operations; | |
aef9ab47 | 348 | init_special_inode(inode, inode->i_mode, rdev); |
1da177e4 LT |
349 | break; |
350 | ||
351 | default: | |
da320f05 JP |
352 | pr_warn("%s(): Bogus i_mode %o for ino %lu\n", |
353 | __func__, inode->i_mode, (unsigned long)inode->i_ino); | |
1da177e4 LT |
354 | } |
355 | ||
ced22070 | 356 | mutex_unlock(&f->sem); |
1da177e4 | 357 | |
9c261b33 | 358 | jffs2_dbg(1, "jffs2_read_inode() returning\n"); |
5451f79f DH |
359 | unlock_new_inode(inode); |
360 | return inode; | |
361 | ||
362 | error_io: | |
363 | ret = -EIO; | |
364 | error: | |
ced22070 | 365 | mutex_unlock(&f->sem); |
5451f79f DH |
366 | jffs2_do_clear_inode(c, f); |
367 | iget_failed(inode); | |
368 | return ERR_PTR(ret); | |
1da177e4 LT |
369 | } |
370 | ||
aa385729 | 371 | void jffs2_dirty_inode(struct inode *inode, int flags) |
1da177e4 LT |
372 | { |
373 | struct iattr iattr; | |
374 | ||
375 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { | |
9c261b33 JP |
376 | jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n", |
377 | __func__, inode->i_ino); | |
1da177e4 LT |
378 | return; |
379 | } | |
380 | ||
9c261b33 JP |
381 | jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n", |
382 | __func__, inode->i_ino); | |
1da177e4 LT |
383 | |
384 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; | |
385 | iattr.ia_mode = inode->i_mode; | |
386 | iattr.ia_uid = inode->i_uid; | |
387 | iattr.ia_gid = inode->i_gid; | |
388 | iattr.ia_atime = inode->i_atime; | |
389 | iattr.ia_mtime = inode->i_mtime; | |
390 | iattr.ia_ctime = inode->i_ctime; | |
391 | ||
392 | jffs2_do_setattr(inode, &iattr); | |
393 | } | |
394 | ||
92abc475 | 395 | int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data) |
1da177e4 LT |
396 | { |
397 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
398 | ||
399 | if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) | |
400 | return -EROFS; | |
401 | ||
402 | /* We stop if it was running, then restart if it needs to. | |
403 | This also catches the case where it was stopped and this | |
404 | is just a remount to restart it. | |
405 | Flush the writebuffer, if neccecary, else we loose it */ | |
406 | if (!(sb->s_flags & MS_RDONLY)) { | |
407 | jffs2_stop_garbage_collect_thread(c); | |
ced22070 | 408 | mutex_lock(&c->alloc_sem); |
1da177e4 | 409 | jffs2_flush_wbuf_pad(c); |
ced22070 | 410 | mutex_unlock(&c->alloc_sem); |
182ec4ee | 411 | } |
1da177e4 LT |
412 | |
413 | if (!(*flags & MS_RDONLY)) | |
414 | jffs2_start_garbage_collect_thread(c); | |
182ec4ee | 415 | |
1da177e4 | 416 | *flags |= MS_NOATIME; |
1da177e4 LT |
417 | return 0; |
418 | } | |
419 | ||
1da177e4 LT |
420 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, |
421 | fill in the raw_inode while you're at it. */ | |
d3fb6120 | 422 | struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri) |
1da177e4 LT |
423 | { |
424 | struct inode *inode; | |
425 | struct super_block *sb = dir_i->i_sb; | |
426 | struct jffs2_sb_info *c; | |
427 | struct jffs2_inode_info *f; | |
428 | int ret; | |
429 | ||
9c261b33 JP |
430 | jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n", |
431 | __func__, dir_i->i_ino, mode); | |
1da177e4 LT |
432 | |
433 | c = JFFS2_SB_INFO(sb); | |
182ec4ee | 434 | |
1da177e4 | 435 | inode = new_inode(sb); |
182ec4ee | 436 | |
1da177e4 LT |
437 | if (!inode) |
438 | return ERR_PTR(-ENOMEM); | |
439 | ||
440 | f = JFFS2_INODE_INFO(inode); | |
441 | jffs2_init_inode_info(f); | |
ced22070 | 442 | mutex_lock(&f->sem); |
1da177e4 LT |
443 | |
444 | memset(ri, 0, sizeof(*ri)); | |
445 | /* Set OS-specific defaults for new inodes */ | |
0cfe53d3 | 446 | ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid())); |
1da177e4 LT |
447 | |
448 | if (dir_i->i_mode & S_ISGID) { | |
0cfe53d3 | 449 | ri->gid = cpu_to_je16(i_gid_read(dir_i)); |
1da177e4 LT |
450 | if (S_ISDIR(mode)) |
451 | mode |= S_ISGID; | |
452 | } else { | |
0cfe53d3 | 453 | ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid())); |
1da177e4 | 454 | } |
9ed437c5 DW |
455 | |
456 | /* POSIX ACLs have to be processed now, at least partly. | |
457 | The umask is only applied if there's no default ACL */ | |
cfc8dc6f KK |
458 | ret = jffs2_init_acl_pre(dir_i, inode, &mode); |
459 | if (ret) { | |
01887a3a WG |
460 | mutex_unlock(&f->sem); |
461 | make_bad_inode(inode); | |
462 | iput(inode); | |
463 | return ERR_PTR(ret); | |
9ed437c5 | 464 | } |
1da177e4 LT |
465 | ret = jffs2_do_new_inode (c, f, mode, ri); |
466 | if (ret) { | |
01887a3a | 467 | mutex_unlock(&f->sem); |
1da177e4 LT |
468 | make_bad_inode(inode); |
469 | iput(inode); | |
470 | return ERR_PTR(ret); | |
471 | } | |
bfe86848 | 472 | set_nlink(inode, 1); |
1da177e4 LT |
473 | inode->i_ino = je32_to_cpu(ri->ino); |
474 | inode->i_mode = jemode_to_cpu(ri->mode); | |
0cfe53d3 EB |
475 | i_gid_write(inode, je16_to_cpu(ri->gid)); |
476 | i_uid_write(inode, je16_to_cpu(ri->uid)); | |
1da177e4 LT |
477 | inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; |
478 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); | |
479 | ||
1da177e4 LT |
480 | inode->i_blocks = 0; |
481 | inode->i_size = 0; | |
482 | ||
e72e6497 | 483 | if (insert_inode_locked(inode) < 0) { |
01887a3a | 484 | mutex_unlock(&f->sem); |
e72e6497 | 485 | make_bad_inode(inode); |
e72e6497 DW |
486 | iput(inode); |
487 | return ERR_PTR(-EINVAL); | |
488 | } | |
1da177e4 LT |
489 | |
490 | return inode; | |
491 | } | |
492 | ||
65e5a0e1 DD |
493 | static int calculate_inocache_hashsize(uint32_t flash_size) |
494 | { | |
495 | /* | |
496 | * Pick a inocache hash size based on the size of the medium. | |
497 | * Count how many megabytes we're dealing with, apply a hashsize twice | |
498 | * that size, but rounding down to the usual big powers of 2. And keep | |
499 | * to sensible bounds. | |
500 | */ | |
501 | ||
502 | int size_mb = flash_size / 1024 / 1024; | |
503 | int hashsize = (size_mb * 2) & ~0x3f; | |
504 | ||
505 | if (hashsize < INOCACHE_HASHSIZE_MIN) | |
506 | return INOCACHE_HASHSIZE_MIN; | |
507 | if (hashsize > INOCACHE_HASHSIZE_MAX) | |
508 | return INOCACHE_HASHSIZE_MAX; | |
509 | ||
510 | return hashsize; | |
511 | } | |
1da177e4 LT |
512 | |
513 | int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) | |
514 | { | |
515 | struct jffs2_sb_info *c; | |
516 | struct inode *root_i; | |
517 | int ret; | |
518 | size_t blocks; | |
519 | ||
520 | c = JFFS2_SB_INFO(sb); | |
521 | ||
e104f1e9 HS |
522 | /* Do not support the MLC nand */ |
523 | if (c->mtd->type == MTD_MLCNANDFLASH) | |
524 | return -EINVAL; | |
525 | ||
2f82ce1e | 526 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 527 | if (c->mtd->type == MTD_NANDFLASH) { |
5a528957 | 528 | pr_err("Cannot operate on NAND flash unless jffs2 NAND support is compiled in\n"); |
1da177e4 LT |
529 | return -EINVAL; |
530 | } | |
8f15fd55 | 531 | if (c->mtd->type == MTD_DATAFLASH) { |
5a528957 | 532 | pr_err("Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in\n"); |
8f15fd55 AV |
533 | return -EINVAL; |
534 | } | |
535 | #endif | |
1da177e4 LT |
536 | |
537 | c->flash_size = c->mtd->size; | |
182ec4ee | 538 | c->sector_size = c->mtd->erasesize; |
1da177e4 | 539 | blocks = c->flash_size / c->sector_size; |
1da177e4 LT |
540 | |
541 | /* | |
542 | * Size alignment check | |
543 | */ | |
544 | if ((c->sector_size * blocks) != c->flash_size) { | |
182ec4ee | 545 | c->flash_size = c->sector_size * blocks; |
5a528957 | 546 | pr_info("Flash size not aligned to erasesize, reducing to %dKiB\n", |
1da177e4 LT |
547 | c->flash_size / 1024); |
548 | } | |
549 | ||
1da177e4 | 550 | if (c->flash_size < 5*c->sector_size) { |
5a528957 | 551 | pr_err("Too few erase blocks (%d)\n", |
da320f05 | 552 | c->flash_size / c->sector_size); |
1da177e4 LT |
553 | return -EINVAL; |
554 | } | |
555 | ||
556 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); | |
1da177e4 LT |
557 | |
558 | /* NAND (or other bizarre) flash... do setup accordingly */ | |
559 | ret = jffs2_flash_setup(c); | |
560 | if (ret) | |
561 | return ret; | |
562 | ||
65e5a0e1 DD |
563 | c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size); |
564 | c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); | |
1da177e4 LT |
565 | if (!c->inocache_list) { |
566 | ret = -ENOMEM; | |
567 | goto out_wbuf; | |
568 | } | |
1da177e4 | 569 | |
aa98d7cf KK |
570 | jffs2_init_xattr_subsystem(c); |
571 | ||
1da177e4 LT |
572 | if ((ret = jffs2_do_mount_fs(c))) |
573 | goto out_inohash; | |
574 | ||
9c261b33 | 575 | jffs2_dbg(1, "%s(): Getting root inode\n", __func__); |
5451f79f DH |
576 | root_i = jffs2_iget(sb, 1); |
577 | if (IS_ERR(root_i)) { | |
9c261b33 | 578 | jffs2_dbg(1, "get root inode failed\n"); |
5451f79f DH |
579 | ret = PTR_ERR(root_i); |
580 | goto out_root; | |
1da177e4 LT |
581 | } |
582 | ||
5451f79f DH |
583 | ret = -ENOMEM; |
584 | ||
623ff773 | 585 | jffs2_dbg(1, "%s(): d_make_root()\n", __func__); |
48fde701 | 586 | sb->s_root = d_make_root(root_i); |
1da177e4 | 587 | if (!sb->s_root) |
48fde701 | 588 | goto out_root; |
1da177e4 | 589 | |
1da177e4 | 590 | sb->s_maxbytes = 0xFFFFFFFF; |
1da177e4 LT |
591 | sb->s_blocksize = PAGE_CACHE_SIZE; |
592 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
593 | sb->s_magic = JFFS2_SUPER_MAGIC; | |
594 | if (!(sb->s_flags & MS_RDONLY)) | |
595 | jffs2_start_garbage_collect_thread(c); | |
596 | return 0; | |
597 | ||
5451f79f | 598 | out_root: |
1da177e4 LT |
599 | jffs2_free_ino_caches(c); |
600 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 601 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
602 | vfree(c->blocks); |
603 | else | |
604 | kfree(c->blocks); | |
605 | out_inohash: | |
aa98d7cf | 606 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
607 | kfree(c->inocache_list); |
608 | out_wbuf: | |
609 | jffs2_flash_cleanup(c); | |
610 | ||
611 | return ret; | |
612 | } | |
613 | ||
614 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, | |
615 | struct jffs2_inode_info *f) | |
616 | { | |
617 | iput(OFNI_EDONI_2SFFJ(f)); | |
618 | } | |
619 | ||
620 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, | |
1b690b48 | 621 | int inum, int unlinked) |
1da177e4 LT |
622 | { |
623 | struct inode *inode; | |
624 | struct jffs2_inode_cache *ic; | |
1b690b48 DW |
625 | |
626 | if (unlinked) { | |
1da177e4 | 627 | /* The inode has zero nlink but its nodes weren't yet marked |
182ec4ee | 628 | obsolete. This has to be because we're still waiting for |
1da177e4 LT |
629 | the final (close() and) iput() to happen. |
630 | ||
182ec4ee | 631 | There's a possibility that the final iput() could have |
1da177e4 LT |
632 | happened while we were contemplating. In order to ensure |
633 | that we don't cause a new read_inode() (which would fail) | |
634 | for the inode in question, we use ilookup() in this case | |
635 | instead of iget(). | |
636 | ||
182ec4ee | 637 | The nlink can't _become_ zero at this point because we're |
1da177e4 LT |
638 | holding the alloc_sem, and jffs2_do_unlink() would also |
639 | need that while decrementing nlink on any inode. | |
640 | */ | |
641 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); | |
642 | if (!inode) { | |
9c261b33 JP |
643 | jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n", |
644 | inum); | |
1da177e4 LT |
645 | |
646 | spin_lock(&c->inocache_lock); | |
647 | ic = jffs2_get_ino_cache(c, inum); | |
648 | if (!ic) { | |
9c261b33 JP |
649 | jffs2_dbg(1, "Inode cache for ino #%u is gone\n", |
650 | inum); | |
1da177e4 LT |
651 | spin_unlock(&c->inocache_lock); |
652 | return NULL; | |
653 | } | |
654 | if (ic->state != INO_STATE_CHECKEDABSENT) { | |
655 | /* Wait for progress. Don't just loop */ | |
9c261b33 JP |
656 | jffs2_dbg(1, "Waiting for ino #%u in state %d\n", |
657 | ic->ino, ic->state); | |
1da177e4 LT |
658 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); |
659 | } else { | |
660 | spin_unlock(&c->inocache_lock); | |
661 | } | |
662 | ||
663 | return NULL; | |
664 | } | |
665 | } else { | |
666 | /* Inode has links to it still; they're not going away because | |
667 | jffs2_do_unlink() would need the alloc_sem and we have it. | |
668 | Just iget() it, and if read_inode() is necessary that's OK. | |
669 | */ | |
5451f79f DH |
670 | inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); |
671 | if (IS_ERR(inode)) | |
672 | return ERR_CAST(inode); | |
1da177e4 LT |
673 | } |
674 | if (is_bad_inode(inode)) { | |
da320f05 JP |
675 | pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n", |
676 | inum, unlinked); | |
1da177e4 LT |
677 | /* NB. This will happen again. We need to do something appropriate here. */ |
678 | iput(inode); | |
679 | return ERR_PTR(-EIO); | |
680 | } | |
681 | ||
682 | return JFFS2_INODE_INFO(inode); | |
683 | } | |
684 | ||
182ec4ee TG |
685 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
686 | struct jffs2_inode_info *f, | |
1da177e4 LT |
687 | unsigned long offset, |
688 | unsigned long *priv) | |
689 | { | |
690 | struct inode *inode = OFNI_EDONI_2SFFJ(f); | |
691 | struct page *pg; | |
692 | ||
67f9fd91 | 693 | pg = read_cache_page(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
1da177e4 LT |
694 | (void *)jffs2_do_readpage_unlock, inode); |
695 | if (IS_ERR(pg)) | |
696 | return (void *)pg; | |
182ec4ee | 697 | |
1da177e4 LT |
698 | *priv = (unsigned long)pg; |
699 | return kmap(pg); | |
700 | } | |
701 | ||
702 | void jffs2_gc_release_page(struct jffs2_sb_info *c, | |
703 | unsigned char *ptr, | |
704 | unsigned long *priv) | |
705 | { | |
706 | struct page *pg = (void *)*priv; | |
707 | ||
708 | kunmap(pg); | |
709 | page_cache_release(pg); | |
710 | } | |
711 | ||
712 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { | |
713 | int ret = 0; | |
182ec4ee | 714 | |
1da177e4 LT |
715 | if (jffs2_cleanmarker_oob(c)) { |
716 | /* NAND flash... do setup accordingly */ | |
717 | ret = jffs2_nand_flash_setup(c); | |
718 | if (ret) | |
719 | return ret; | |
720 | } | |
721 | ||
8f15fd55 AV |
722 | /* and Dataflash */ |
723 | if (jffs2_dataflash(c)) { | |
724 | ret = jffs2_dataflash_setup(c); | |
725 | if (ret) | |
726 | return ret; | |
727 | } | |
59da721a NP |
728 | |
729 | /* and Intel "Sibley" flash */ | |
730 | if (jffs2_nor_wbuf_flash(c)) { | |
731 | ret = jffs2_nor_wbuf_flash_setup(c); | |
732 | if (ret) | |
733 | return ret; | |
734 | } | |
735 | ||
0029da3b AB |
736 | /* and an UBI volume */ |
737 | if (jffs2_ubivol(c)) { | |
738 | ret = jffs2_ubivol_setup(c); | |
739 | if (ret) | |
740 | return ret; | |
741 | } | |
742 | ||
1da177e4 LT |
743 | return ret; |
744 | } | |
745 | ||
746 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { | |
747 | ||
748 | if (jffs2_cleanmarker_oob(c)) { | |
749 | jffs2_nand_flash_cleanup(c); | |
750 | } | |
751 | ||
8f15fd55 AV |
752 | /* and DataFlash */ |
753 | if (jffs2_dataflash(c)) { | |
754 | jffs2_dataflash_cleanup(c); | |
755 | } | |
59da721a NP |
756 | |
757 | /* and Intel "Sibley" flash */ | |
758 | if (jffs2_nor_wbuf_flash(c)) { | |
759 | jffs2_nor_wbuf_flash_cleanup(c); | |
760 | } | |
0029da3b AB |
761 | |
762 | /* and an UBI volume */ | |
763 | if (jffs2_ubivol(c)) { | |
764 | jffs2_ubivol_cleanup(c); | |
765 | } | |
1da177e4 | 766 | } |