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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2001-2003 Red Hat, Inc. | |
5 | * | |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
2f0077e0 | 10 | * $Id: fs.c,v 1.66 2005/09/27 13:17:29 dedekind Exp $ |
1da177e4 LT |
11 | * |
12 | */ | |
13 | ||
16f7e0fe | 14 | #include <linux/capability.h> |
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/sched.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/list.h> | |
19 | #include <linux/mtd/mtd.h> | |
20 | #include <linux/pagemap.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/vmalloc.h> | |
23 | #include <linux/vfs.h> | |
24 | #include <linux/crc32.h> | |
25 | #include "nodelist.h" | |
26 | ||
27 | static int jffs2_flash_setup(struct jffs2_sb_info *c); | |
28 | ||
29 | static int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) | |
30 | { | |
31 | struct jffs2_full_dnode *old_metadata, *new_metadata; | |
32 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
33 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
34 | struct jffs2_raw_inode *ri; | |
aef9ab47 | 35 | union jffs2_device_node dev; |
1da177e4 LT |
36 | unsigned char *mdata = NULL; |
37 | int mdatalen = 0; | |
38 | unsigned int ivalid; | |
9fe4854c | 39 | uint32_t alloclen; |
1da177e4 LT |
40 | int ret; |
41 | D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino)); | |
42 | ret = inode_change_ok(inode, iattr); | |
182ec4ee | 43 | if (ret) |
1da177e4 LT |
44 | return ret; |
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; |
1da177e4 LT |
55 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen)); |
56 | } else if (S_ISLNK(inode->i_mode)) { | |
422138dd | 57 | down(&f->sem); |
1da177e4 LT |
58 | mdatalen = f->metadata->size; |
59 | mdata = kmalloc(f->metadata->size, GFP_USER); | |
422138dd DB |
60 | if (!mdata) { |
61 | up(&f->sem); | |
1da177e4 | 62 | return -ENOMEM; |
422138dd | 63 | } |
1da177e4 LT |
64 | ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); |
65 | if (ret) { | |
422138dd | 66 | up(&f->sem); |
1da177e4 LT |
67 | kfree(mdata); |
68 | return ret; | |
69 | } | |
422138dd | 70 | up(&f->sem); |
1da177e4 LT |
71 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen)); |
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); | |
85 | if (S_ISLNK(inode->i_mode & S_IFMT)) | |
86 | kfree(mdata); | |
87 | return ret; | |
88 | } | |
89 | down(&f->sem); | |
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) | |
104 | if (iattr->ia_mode & S_ISGID && | |
105 | !in_group_p(je16_to_cpu(ri->gid)) && !capable(CAP_FSETID)) | |
106 | ri->mode = cpu_to_jemode(iattr->ia_mode & ~S_ISGID); | |
182ec4ee | 107 | else |
1da177e4 LT |
108 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
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); | |
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 | ||
9fe4854c | 133 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, ALLOC_NORMAL); |
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); | |
140 | up(&f->sem); | |
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; | |
160 | f->metadata = NULL; | |
161 | } else { | |
162 | f->metadata = new_metadata; | |
163 | } | |
164 | if (old_metadata) { | |
165 | jffs2_mark_node_obsolete(c, old_metadata->raw); | |
166 | jffs2_free_full_dnode(old_metadata); | |
167 | } | |
168 | jffs2_free_raw_inode(ri); | |
169 | ||
170 | up(&f->sem); | |
171 | jffs2_complete_reservation(c); | |
172 | ||
173 | /* We have to do the vmtruncate() without f->sem held, since | |
182ec4ee | 174 | some pages may be locked and waiting for it in readpage(). |
1da177e4 LT |
175 | We are protected from a simultaneous write() extending i_size |
176 | back past iattr->ia_size, because do_truncate() holds the | |
177 | generic inode semaphore. */ | |
178 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
179 | vmtruncate(inode, iattr->ia_size); | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) | |
185 | { | |
aa98d7cf KK |
186 | int rc; |
187 | ||
188 | rc = jffs2_do_setattr(dentry->d_inode, iattr); | |
189 | if (!rc && (iattr->ia_valid & ATTR_MODE)) | |
190 | rc = jffs2_acl_chmod(dentry->d_inode); | |
191 | return rc; | |
1da177e4 LT |
192 | } |
193 | ||
726c3342 | 194 | int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 195 | { |
726c3342 | 196 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
1da177e4 LT |
197 | unsigned long avail; |
198 | ||
199 | buf->f_type = JFFS2_SUPER_MAGIC; | |
200 | buf->f_bsize = 1 << PAGE_SHIFT; | |
201 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; | |
202 | buf->f_files = 0; | |
203 | buf->f_ffree = 0; | |
204 | buf->f_namelen = JFFS2_MAX_NAME_LEN; | |
205 | ||
206 | spin_lock(&c->erase_completion_lock); | |
1da177e4 LT |
207 | avail = c->dirty_size + c->free_size; |
208 | if (avail > c->sector_size * c->resv_blocks_write) | |
209 | avail -= c->sector_size * c->resv_blocks_write; | |
210 | else | |
211 | avail = 0; | |
e0c8e42f | 212 | spin_unlock(&c->erase_completion_lock); |
1da177e4 LT |
213 | |
214 | buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; | |
215 | ||
1da177e4 LT |
216 | return 0; |
217 | } | |
218 | ||
219 | ||
220 | void jffs2_clear_inode (struct inode *inode) | |
221 | { | |
182ec4ee | 222 | /* We can forget about this inode for now - drop all |
1da177e4 LT |
223 | * the nodelists associated with it, etc. |
224 | */ | |
225 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
226 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
182ec4ee | 227 | |
1da177e4 | 228 | D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode)); |
1da177e4 LT |
229 | jffs2_do_clear_inode(c, f); |
230 | } | |
231 | ||
232 | void jffs2_read_inode (struct inode *inode) | |
233 | { | |
234 | struct jffs2_inode_info *f; | |
235 | struct jffs2_sb_info *c; | |
236 | struct jffs2_raw_inode latest_node; | |
aef9ab47 DW |
237 | union jffs2_device_node jdev; |
238 | dev_t rdev = 0; | |
1da177e4 LT |
239 | int ret; |
240 | ||
241 | D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino)); | |
242 | ||
243 | f = JFFS2_INODE_INFO(inode); | |
244 | c = JFFS2_SB_INFO(inode->i_sb); | |
245 | ||
246 | jffs2_init_inode_info(f); | |
21eeb7aa | 247 | down(&f->sem); |
182ec4ee | 248 | |
1da177e4 LT |
249 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
250 | ||
251 | if (ret) { | |
252 | make_bad_inode(inode); | |
253 | up(&f->sem); | |
254 | return; | |
255 | } | |
256 | inode->i_mode = jemode_to_cpu(latest_node.mode); | |
257 | inode->i_uid = je16_to_cpu(latest_node.uid); | |
258 | inode->i_gid = je16_to_cpu(latest_node.gid); | |
259 | inode->i_size = je32_to_cpu(latest_node.isize); | |
260 | inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); | |
261 | inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); | |
262 | inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); | |
263 | ||
264 | inode->i_nlink = f->inocache->nlink; | |
265 | ||
1da177e4 | 266 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 267 | |
1da177e4 | 268 | switch (inode->i_mode & S_IFMT) { |
1da177e4 LT |
269 | |
270 | case S_IFLNK: | |
271 | inode->i_op = &jffs2_symlink_inode_operations; | |
272 | break; | |
182ec4ee | 273 | |
1da177e4 LT |
274 | case S_IFDIR: |
275 | { | |
276 | struct jffs2_full_dirent *fd; | |
277 | ||
278 | for (fd=f->dents; fd; fd = fd->next) { | |
279 | if (fd->type == DT_DIR && fd->ino) | |
d8c76e6f | 280 | inc_nlink(inode); |
1da177e4 LT |
281 | } |
282 | /* and '..' */ | |
d8c76e6f | 283 | inc_nlink(inode); |
1da177e4 LT |
284 | /* Root dir gets i_nlink 3 for some reason */ |
285 | if (inode->i_ino == 1) | |
d8c76e6f | 286 | inc_nlink(inode); |
1da177e4 LT |
287 | |
288 | inode->i_op = &jffs2_dir_inode_operations; | |
289 | inode->i_fop = &jffs2_dir_operations; | |
290 | break; | |
291 | } | |
292 | case S_IFREG: | |
293 | inode->i_op = &jffs2_file_inode_operations; | |
294 | inode->i_fop = &jffs2_file_operations; | |
295 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
296 | inode->i_mapping->nrpages = 0; | |
297 | break; | |
298 | ||
299 | case S_IFBLK: | |
300 | case S_IFCHR: | |
301 | /* Read the device numbers from the media */ | |
aef9ab47 DW |
302 | if (f->metadata->size != sizeof(jdev.old) && |
303 | f->metadata->size != sizeof(jdev.new)) { | |
304 | printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size); | |
305 | up(&f->sem); | |
306 | jffs2_do_clear_inode(c, f); | |
307 | make_bad_inode(inode); | |
308 | return; | |
309 | } | |
1da177e4 | 310 | D1(printk(KERN_DEBUG "Reading device numbers from flash\n")); |
aef9ab47 | 311 | if (jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size) < 0) { |
1da177e4 LT |
312 | /* Eep */ |
313 | printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino); | |
314 | up(&f->sem); | |
315 | jffs2_do_clear_inode(c, f); | |
316 | make_bad_inode(inode); | |
317 | return; | |
182ec4ee | 318 | } |
aef9ab47 DW |
319 | if (f->metadata->size == sizeof(jdev.old)) |
320 | rdev = old_decode_dev(je16_to_cpu(jdev.old)); | |
321 | else | |
322 | rdev = new_decode_dev(je32_to_cpu(jdev.new)); | |
1da177e4 LT |
323 | |
324 | case S_IFSOCK: | |
325 | case S_IFIFO: | |
326 | inode->i_op = &jffs2_file_inode_operations; | |
aef9ab47 | 327 | init_special_inode(inode, inode->i_mode, rdev); |
1da177e4 LT |
328 | break; |
329 | ||
330 | default: | |
331 | printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino); | |
332 | } | |
333 | ||
334 | up(&f->sem); | |
335 | ||
336 | D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n")); | |
337 | } | |
338 | ||
339 | void jffs2_dirty_inode(struct inode *inode) | |
340 | { | |
341 | struct iattr iattr; | |
342 | ||
343 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { | |
344 | D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino)); | |
345 | return; | |
346 | } | |
347 | ||
348 | D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino)); | |
349 | ||
350 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; | |
351 | iattr.ia_mode = inode->i_mode; | |
352 | iattr.ia_uid = inode->i_uid; | |
353 | iattr.ia_gid = inode->i_gid; | |
354 | iattr.ia_atime = inode->i_atime; | |
355 | iattr.ia_mtime = inode->i_mtime; | |
356 | iattr.ia_ctime = inode->i_ctime; | |
357 | ||
358 | jffs2_do_setattr(inode, &iattr); | |
359 | } | |
360 | ||
361 | int jffs2_remount_fs (struct super_block *sb, int *flags, char *data) | |
362 | { | |
363 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
364 | ||
365 | if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) | |
366 | return -EROFS; | |
367 | ||
368 | /* We stop if it was running, then restart if it needs to. | |
369 | This also catches the case where it was stopped and this | |
370 | is just a remount to restart it. | |
371 | Flush the writebuffer, if neccecary, else we loose it */ | |
372 | if (!(sb->s_flags & MS_RDONLY)) { | |
373 | jffs2_stop_garbage_collect_thread(c); | |
374 | down(&c->alloc_sem); | |
375 | jffs2_flush_wbuf_pad(c); | |
376 | up(&c->alloc_sem); | |
182ec4ee | 377 | } |
1da177e4 LT |
378 | |
379 | if (!(*flags & MS_RDONLY)) | |
380 | jffs2_start_garbage_collect_thread(c); | |
182ec4ee | 381 | |
1da177e4 LT |
382 | *flags |= MS_NOATIME; |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | void jffs2_write_super (struct super_block *sb) | |
388 | { | |
389 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
390 | sb->s_dirt = 0; | |
391 | ||
392 | if (sb->s_flags & MS_RDONLY) | |
393 | return; | |
394 | ||
395 | D1(printk(KERN_DEBUG "jffs2_write_super()\n")); | |
396 | jffs2_garbage_collect_trigger(c); | |
397 | jffs2_erase_pending_blocks(c, 0); | |
398 | jffs2_flush_wbuf_gc(c, 0); | |
399 | } | |
400 | ||
401 | ||
402 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, | |
403 | fill in the raw_inode while you're at it. */ | |
404 | struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri) | |
405 | { | |
406 | struct inode *inode; | |
407 | struct super_block *sb = dir_i->i_sb; | |
408 | struct jffs2_sb_info *c; | |
409 | struct jffs2_inode_info *f; | |
410 | int ret; | |
411 | ||
412 | D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode)); | |
413 | ||
414 | c = JFFS2_SB_INFO(sb); | |
182ec4ee | 415 | |
1da177e4 | 416 | inode = new_inode(sb); |
182ec4ee | 417 | |
1da177e4 LT |
418 | if (!inode) |
419 | return ERR_PTR(-ENOMEM); | |
420 | ||
421 | f = JFFS2_INODE_INFO(inode); | |
422 | jffs2_init_inode_info(f); | |
21eeb7aa | 423 | down(&f->sem); |
1da177e4 LT |
424 | |
425 | memset(ri, 0, sizeof(*ri)); | |
426 | /* Set OS-specific defaults for new inodes */ | |
427 | ri->uid = cpu_to_je16(current->fsuid); | |
428 | ||
429 | if (dir_i->i_mode & S_ISGID) { | |
430 | ri->gid = cpu_to_je16(dir_i->i_gid); | |
431 | if (S_ISDIR(mode)) | |
432 | mode |= S_ISGID; | |
433 | } else { | |
434 | ri->gid = cpu_to_je16(current->fsgid); | |
435 | } | |
436 | ri->mode = cpu_to_jemode(mode); | |
437 | ret = jffs2_do_new_inode (c, f, mode, ri); | |
438 | if (ret) { | |
439 | make_bad_inode(inode); | |
440 | iput(inode); | |
441 | return ERR_PTR(ret); | |
442 | } | |
443 | inode->i_nlink = 1; | |
444 | inode->i_ino = je32_to_cpu(ri->ino); | |
445 | inode->i_mode = jemode_to_cpu(ri->mode); | |
446 | inode->i_gid = je16_to_cpu(ri->gid); | |
447 | inode->i_uid = je16_to_cpu(ri->uid); | |
448 | inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; | |
449 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); | |
450 | ||
1da177e4 LT |
451 | inode->i_blocks = 0; |
452 | inode->i_size = 0; | |
453 | ||
454 | insert_inode_hash(inode); | |
455 | ||
456 | return inode; | |
457 | } | |
458 | ||
459 | ||
460 | int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) | |
461 | { | |
462 | struct jffs2_sb_info *c; | |
463 | struct inode *root_i; | |
464 | int ret; | |
465 | size_t blocks; | |
466 | ||
467 | c = JFFS2_SB_INFO(sb); | |
468 | ||
2f82ce1e | 469 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
470 | if (c->mtd->type == MTD_NANDFLASH) { |
471 | printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n"); | |
472 | return -EINVAL; | |
473 | } | |
8f15fd55 AV |
474 | if (c->mtd->type == MTD_DATAFLASH) { |
475 | printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n"); | |
476 | return -EINVAL; | |
477 | } | |
478 | #endif | |
1da177e4 LT |
479 | |
480 | c->flash_size = c->mtd->size; | |
182ec4ee | 481 | c->sector_size = c->mtd->erasesize; |
1da177e4 | 482 | blocks = c->flash_size / c->sector_size; |
1da177e4 LT |
483 | |
484 | /* | |
485 | * Size alignment check | |
486 | */ | |
487 | if ((c->sector_size * blocks) != c->flash_size) { | |
182ec4ee | 488 | c->flash_size = c->sector_size * blocks; |
1da177e4 LT |
489 | printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n", |
490 | c->flash_size / 1024); | |
491 | } | |
492 | ||
1da177e4 LT |
493 | if (c->flash_size < 5*c->sector_size) { |
494 | printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size); | |
495 | return -EINVAL; | |
496 | } | |
497 | ||
498 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); | |
1da177e4 LT |
499 | |
500 | /* NAND (or other bizarre) flash... do setup accordingly */ | |
501 | ret = jffs2_flash_setup(c); | |
502 | if (ret) | |
503 | return ret; | |
504 | ||
3d375d9e | 505 | c->inocache_list = kcalloc(INOCACHE_HASHSIZE, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); |
1da177e4 LT |
506 | if (!c->inocache_list) { |
507 | ret = -ENOMEM; | |
508 | goto out_wbuf; | |
509 | } | |
1da177e4 | 510 | |
aa98d7cf KK |
511 | jffs2_init_xattr_subsystem(c); |
512 | ||
1da177e4 LT |
513 | if ((ret = jffs2_do_mount_fs(c))) |
514 | goto out_inohash; | |
515 | ||
516 | ret = -EINVAL; | |
517 | ||
518 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n")); | |
519 | root_i = iget(sb, 1); | |
520 | if (is_bad_inode(root_i)) { | |
521 | D1(printk(KERN_WARNING "get root inode failed\n")); | |
6dac02a5 | 522 | goto out_root_i; |
1da177e4 LT |
523 | } |
524 | ||
525 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n")); | |
526 | sb->s_root = d_alloc_root(root_i); | |
527 | if (!sb->s_root) | |
528 | goto out_root_i; | |
529 | ||
1da177e4 | 530 | sb->s_maxbytes = 0xFFFFFFFF; |
1da177e4 LT |
531 | sb->s_blocksize = PAGE_CACHE_SIZE; |
532 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
533 | sb->s_magic = JFFS2_SUPER_MAGIC; | |
534 | if (!(sb->s_flags & MS_RDONLY)) | |
535 | jffs2_start_garbage_collect_thread(c); | |
536 | return 0; | |
537 | ||
538 | out_root_i: | |
539 | iput(root_i); | |
1da177e4 LT |
540 | jffs2_free_ino_caches(c); |
541 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 542 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
543 | vfree(c->blocks); |
544 | else | |
545 | kfree(c->blocks); | |
546 | out_inohash: | |
aa98d7cf | 547 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
548 | kfree(c->inocache_list); |
549 | out_wbuf: | |
550 | jffs2_flash_cleanup(c); | |
551 | ||
552 | return ret; | |
553 | } | |
554 | ||
555 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, | |
556 | struct jffs2_inode_info *f) | |
557 | { | |
558 | iput(OFNI_EDONI_2SFFJ(f)); | |
559 | } | |
560 | ||
561 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, | |
562 | int inum, int nlink) | |
563 | { | |
564 | struct inode *inode; | |
565 | struct jffs2_inode_cache *ic; | |
566 | if (!nlink) { | |
567 | /* The inode has zero nlink but its nodes weren't yet marked | |
182ec4ee | 568 | obsolete. This has to be because we're still waiting for |
1da177e4 LT |
569 | the final (close() and) iput() to happen. |
570 | ||
182ec4ee | 571 | There's a possibility that the final iput() could have |
1da177e4 LT |
572 | happened while we were contemplating. In order to ensure |
573 | that we don't cause a new read_inode() (which would fail) | |
574 | for the inode in question, we use ilookup() in this case | |
575 | instead of iget(). | |
576 | ||
182ec4ee | 577 | The nlink can't _become_ zero at this point because we're |
1da177e4 LT |
578 | holding the alloc_sem, and jffs2_do_unlink() would also |
579 | need that while decrementing nlink on any inode. | |
580 | */ | |
581 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); | |
582 | if (!inode) { | |
583 | D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n", | |
584 | inum)); | |
585 | ||
586 | spin_lock(&c->inocache_lock); | |
587 | ic = jffs2_get_ino_cache(c, inum); | |
588 | if (!ic) { | |
589 | D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum)); | |
590 | spin_unlock(&c->inocache_lock); | |
591 | return NULL; | |
592 | } | |
593 | if (ic->state != INO_STATE_CHECKEDABSENT) { | |
594 | /* Wait for progress. Don't just loop */ | |
595 | D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n", | |
596 | ic->ino, ic->state)); | |
597 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); | |
598 | } else { | |
599 | spin_unlock(&c->inocache_lock); | |
600 | } | |
601 | ||
602 | return NULL; | |
603 | } | |
604 | } else { | |
605 | /* Inode has links to it still; they're not going away because | |
606 | jffs2_do_unlink() would need the alloc_sem and we have it. | |
607 | Just iget() it, and if read_inode() is necessary that's OK. | |
608 | */ | |
609 | inode = iget(OFNI_BS_2SFFJ(c), inum); | |
610 | if (!inode) | |
611 | return ERR_PTR(-ENOMEM); | |
612 | } | |
613 | if (is_bad_inode(inode)) { | |
614 | printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. nlink %d\n", | |
615 | inum, nlink); | |
616 | /* NB. This will happen again. We need to do something appropriate here. */ | |
617 | iput(inode); | |
618 | return ERR_PTR(-EIO); | |
619 | } | |
620 | ||
621 | return JFFS2_INODE_INFO(inode); | |
622 | } | |
623 | ||
182ec4ee TG |
624 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
625 | struct jffs2_inode_info *f, | |
1da177e4 LT |
626 | unsigned long offset, |
627 | unsigned long *priv) | |
628 | { | |
629 | struct inode *inode = OFNI_EDONI_2SFFJ(f); | |
630 | struct page *pg; | |
631 | ||
182ec4ee | 632 | pg = read_cache_page(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
1da177e4 LT |
633 | (void *)jffs2_do_readpage_unlock, inode); |
634 | if (IS_ERR(pg)) | |
635 | return (void *)pg; | |
182ec4ee | 636 | |
1da177e4 LT |
637 | *priv = (unsigned long)pg; |
638 | return kmap(pg); | |
639 | } | |
640 | ||
641 | void jffs2_gc_release_page(struct jffs2_sb_info *c, | |
642 | unsigned char *ptr, | |
643 | unsigned long *priv) | |
644 | { | |
645 | struct page *pg = (void *)*priv; | |
646 | ||
647 | kunmap(pg); | |
648 | page_cache_release(pg); | |
649 | } | |
650 | ||
651 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { | |
652 | int ret = 0; | |
182ec4ee | 653 | |
1da177e4 LT |
654 | if (jffs2_cleanmarker_oob(c)) { |
655 | /* NAND flash... do setup accordingly */ | |
656 | ret = jffs2_nand_flash_setup(c); | |
657 | if (ret) | |
658 | return ret; | |
659 | } | |
660 | ||
8f15fd55 AV |
661 | /* and Dataflash */ |
662 | if (jffs2_dataflash(c)) { | |
663 | ret = jffs2_dataflash_setup(c); | |
664 | if (ret) | |
665 | return ret; | |
666 | } | |
59da721a NP |
667 | |
668 | /* and Intel "Sibley" flash */ | |
669 | if (jffs2_nor_wbuf_flash(c)) { | |
670 | ret = jffs2_nor_wbuf_flash_setup(c); | |
671 | if (ret) | |
672 | return ret; | |
673 | } | |
674 | ||
1da177e4 LT |
675 | return ret; |
676 | } | |
677 | ||
678 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { | |
679 | ||
680 | if (jffs2_cleanmarker_oob(c)) { | |
681 | jffs2_nand_flash_cleanup(c); | |
682 | } | |
683 | ||
8f15fd55 AV |
684 | /* and DataFlash */ |
685 | if (jffs2_dataflash(c)) { | |
686 | jffs2_dataflash_cleanup(c); | |
687 | } | |
59da721a NP |
688 | |
689 | /* and Intel "Sibley" flash */ | |
690 | if (jffs2_nor_wbuf_flash(c)) { | |
691 | jffs2_nor_wbuf_flash_cleanup(c); | |
692 | } | |
1da177e4 | 693 | } |