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1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. |
3 | * |
4 | * Copyright © 2006 NEC Corporation |
5 | * |
6 | * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> |
7 | * |
8 | * For licensing information, see the file 'LICENCE' in this directory. |
9 | * |
10 | */ |
11 | |
12 | #include <linux/kernel.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/fs.h> |
15 | #include <linux/time.h> |
16 | #include <linux/pagemap.h> |
17 | #include <linux/highmem.h> |
18 | #include <linux/crc32.h> |
19 | #include <linux/jffs2.h> |
20 | #include <linux/xattr.h> |
21 | #include <linux/mtd/mtd.h> |
22 | #include "nodelist.h" |
23 | /* -------- xdatum related functions ---------------- |
24 | * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) |
25 | * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is |
26 | * the index of the xattr name/value pair cache (c->xattrindex). |
27 | * is_xattr_datum_unchecked(c, xd) |
28 | * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not |
29 | * unchecked, it returns 0. |
30 | * unload_xattr_datum(c, xd) |
31 | * is used to release xattr name/value pair and detach from c->xattrindex. |
32 | * reclaim_xattr_datum(c) |
33 | * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when |
34 | * memory usage by cache is over c->xdatum_mem_threshold. Currentry, this threshold |
35 | * is hard coded as 32KiB. |
36 | * do_verify_xattr_datum(c, xd) |
37 | * is used to load the xdatum informations without name/value pair from the medium. |
38 | * It's necessary once, because those informations are not collected during mounting |
39 | * process when EBS is enabled. |
40 | * 0 will be returned, if success. An negative return value means recoverable error, and |
41 | * positive return value means unrecoverable error. Thus, caller must remove this xdatum |
42 | * and xref when it returned positive value. |
43 | * do_load_xattr_datum(c, xd) |
44 | * is used to load name/value pair from the medium. |
45 | * The meanings of return value is same as do_verify_xattr_datum(). |
46 | * load_xattr_datum(c, xd) |
47 | * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). |
48 | * If xd need to call do_verify_xattr_datum() at first, it's called before calling |
49 | * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). |
50 | * save_xattr_datum(c, xd) |
51 | * is used to write xdatum to medium. xd->version will be incremented. |
52 | * create_xattr_datum(c, xprefix, xname, xvalue, xsize) |
53 | * is used to create new xdatum and write to medium. |
54 | * unrefer_xattr_datum(c, xd) |
55 | * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD |
56 | * is set on xd->flags and chained xattr_dead_list or release it immediately. |
57 | * In the first case, the garbage collector release it later. |
58 | * -------------------------------------------------- */ |
59 | static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) |
60 | { |
61 | int name_len = strlen(xname); |
62 | |
63 | return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); |
64 | } |
65 | |
66 | static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
67 | { |
68 | struct jffs2_raw_node_ref *raw; |
69 | int rc = 0; |
70 | |
71 | spin_lock(&c->erase_completion_lock); |
72 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { |
73 | if (ref_flags(raw) == REF_UNCHECKED) { |
74 | rc = 1; |
75 | break; |
76 | } |
77 | } |
78 | spin_unlock(&c->erase_completion_lock); |
79 | return rc; |
80 | } |
81 | |
82 | static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
83 | { |
84 | /* must be called under down_write(xattr_sem) */ |
85 | D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); |
86 | if (xd->xname) { |
87 | c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); |
88 | kfree(xd->xname); |
89 | } |
90 | |
91 | list_del_init(&xd->xindex); |
92 | xd->hashkey = 0; |
93 | xd->xname = NULL; |
94 | xd->xvalue = NULL; |
95 | } |
96 | |
97 | static void reclaim_xattr_datum(struct jffs2_sb_info *c) |
98 | { |
99 | /* must be called under down_write(xattr_sem) */ |
100 | struct jffs2_xattr_datum *xd, *_xd; |
101 | uint32_t target, before; |
102 | static int index = 0; |
103 | int count; |
104 | |
105 | if (c->xdatum_mem_threshold > c->xdatum_mem_usage) |
106 | return; |
107 | |
108 | before = c->xdatum_mem_usage; |
109 | target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ |
110 | for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { |
111 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { |
112 | if (xd->flags & JFFS2_XFLAGS_HOT) { |
113 | xd->flags &= ~JFFS2_XFLAGS_HOT; |
114 | } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { |
115 | unload_xattr_datum(c, xd); |
116 | } |
117 | if (c->xdatum_mem_usage <= target) |
118 | goto out; |
119 | } |
120 | index = (index+1) % XATTRINDEX_HASHSIZE; |
121 | } |
122 | out: |
123 | JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", |
124 | before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); |
125 | } |
126 | |
127 | static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
128 | { |
129 | /* must be called under down_write(xattr_sem) */ |
130 | struct jffs2_eraseblock *jeb; |
131 | struct jffs2_raw_node_ref *raw; |
132 | struct jffs2_raw_xattr rx; |
133 | size_t readlen; |
134 | uint32_t crc, offset, totlen; |
135 | int rc; |
136 | |
137 | spin_lock(&c->erase_completion_lock); |
138 | offset = ref_offset(xd->node); |
139 | if (ref_flags(xd->node) == REF_PRISTINE) |
140 | goto complete; |
141 | spin_unlock(&c->erase_completion_lock); |
142 | |
143 | rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); |
144 | if (rc || readlen != sizeof(rx)) { |
145 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", |
146 | rc, sizeof(rx), readlen, offset); |
147 | return rc ? rc : -EIO; |
148 | } |
149 | crc = crc32(0, &rx, sizeof(rx) - 4); |
150 | if (crc != je32_to_cpu(rx.node_crc)) { |
151 | JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
152 | offset, je32_to_cpu(rx.hdr_crc), crc); |
153 | xd->flags |= JFFS2_XFLAGS_INVALID; |
154 | return EIO; |
155 | } |
156 | totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); |
157 | if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK |
158 | || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR |
159 | || je32_to_cpu(rx.totlen) != totlen |
160 | || je32_to_cpu(rx.xid) != xd->xid |
161 | || je32_to_cpu(rx.version) != xd->version) { |
162 | JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " |
163 | "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", |
164 | offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, |
165 | je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, |
166 | je32_to_cpu(rx.totlen), totlen, |
167 | je32_to_cpu(rx.xid), xd->xid, |
168 | je32_to_cpu(rx.version), xd->version); |
169 | xd->flags |= JFFS2_XFLAGS_INVALID; |
170 | return EIO; |
171 | } |
172 | xd->xprefix = rx.xprefix; |
173 | xd->name_len = rx.name_len; |
174 | xd->value_len = je16_to_cpu(rx.value_len); |
175 | xd->data_crc = je32_to_cpu(rx.data_crc); |
176 | |
177 | spin_lock(&c->erase_completion_lock); |
178 | complete: |
179 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { |
180 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; |
181 | totlen = PAD(ref_totlen(c, jeb, raw)); |
182 | if (ref_flags(raw) == REF_UNCHECKED) { |
183 | c->unchecked_size -= totlen; c->used_size += totlen; |
184 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; |
185 | } |
186 | raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); |
187 | } |
188 | spin_unlock(&c->erase_completion_lock); |
189 | |
190 | /* unchecked xdatum is chained with c->xattr_unchecked */ |
191 | list_del_init(&xd->xindex); |
192 | |
193 | dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n", |
194 | xd->xid, xd->version); |
195 | |
196 | return 0; |
197 | } |
198 | |
199 | static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
200 | { |
201 | /* must be called under down_write(xattr_sem) */ |
202 | char *data; |
203 | size_t readlen; |
204 | uint32_t crc, length; |
205 | int i, ret, retry = 0; |
206 | |
207 | BUG_ON(ref_flags(xd->node) != REF_PRISTINE); |
208 | BUG_ON(!list_empty(&xd->xindex)); |
209 | retry: |
210 | length = xd->name_len + 1 + xd->value_len; |
211 | data = kmalloc(length, GFP_KERNEL); |
212 | if (!data) |
213 | return -ENOMEM; |
214 | |
215 | ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), |
216 | length, &readlen, data); |
217 | |
218 | if (ret || length!=readlen) { |
219 | JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", |
220 | ret, length, readlen, ref_offset(xd->node)); |
221 | kfree(data); |
222 | return ret ? ret : -EIO; |
223 | } |
224 | |
225 | data[xd->name_len] = '\0'; |
226 | crc = crc32(0, data, length); |
227 | if (crc != xd->data_crc) { |
228 | JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)" |
229 | " at %#08x, read: 0x%08x calculated: 0x%08x\n", |
230 | ref_offset(xd->node), xd->data_crc, crc); |
231 | kfree(data); |
232 | xd->flags |= JFFS2_XFLAGS_INVALID; |
233 | return EIO; |
234 | } |
235 | |
236 | xd->flags |= JFFS2_XFLAGS_HOT; |
237 | xd->xname = data; |
238 | xd->xvalue = data + xd->name_len+1; |
239 | |
240 | c->xdatum_mem_usage += length; |
241 | |
242 | xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); |
243 | i = xd->hashkey % XATTRINDEX_HASHSIZE; |
244 | list_add(&xd->xindex, &c->xattrindex[i]); |
245 | if (!retry) { |
246 | retry = 1; |
247 | reclaim_xattr_datum(c); |
248 | if (!xd->xname) |
249 | goto retry; |
250 | } |
251 | |
252 | dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", |
253 | xd->xid, xd->xprefix, xd->xname); |
254 | |
255 | return 0; |
256 | } |
257 | |
258 | static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
259 | { |
260 | /* must be called under down_write(xattr_sem); |
261 | * rc < 0 : recoverable error, try again |
262 | * rc = 0 : success |
263 | * rc > 0 : Unrecoverable error, this node should be deleted. |
264 | */ |
265 | int rc = 0; |
266 | |
267 | BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); |
268 | if (xd->xname) |
269 | return 0; |
270 | if (xd->flags & JFFS2_XFLAGS_INVALID) |
271 | return EIO; |
272 | if (unlikely(is_xattr_datum_unchecked(c, xd))) |
273 | rc = do_verify_xattr_datum(c, xd); |
274 | if (!rc) |
275 | rc = do_load_xattr_datum(c, xd); |
276 | return rc; |
277 | } |
278 | |
279 | static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
280 | { |
281 | /* must be called under down_write(xattr_sem) */ |
282 | struct jffs2_raw_xattr rx; |
283 | struct kvec vecs[2]; |
284 | size_t length; |
285 | int rc, totlen; |
286 | uint32_t phys_ofs = write_ofs(c); |
287 | |
288 | BUG_ON(!xd->xname); |
289 | BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); |
290 | |
291 | vecs[0].iov_base = ℞ |
292 | vecs[0].iov_len = sizeof(rx); |
293 | vecs[1].iov_base = xd->xname; |
294 | vecs[1].iov_len = xd->name_len + 1 + xd->value_len; |
295 | totlen = vecs[0].iov_len + vecs[1].iov_len; |
296 | |
297 | /* Setup raw-xattr */ |
298 | memset(&rx, 0, sizeof(rx)); |
299 | rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
300 | rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); |
301 | rx.totlen = cpu_to_je32(PAD(totlen)); |
302 | rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); |
303 | |
304 | rx.xid = cpu_to_je32(xd->xid); |
305 | rx.version = cpu_to_je32(++xd->version); |
306 | rx.xprefix = xd->xprefix; |
307 | rx.name_len = xd->name_len; |
308 | rx.value_len = cpu_to_je16(xd->value_len); |
309 | rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); |
310 | rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); |
311 | |
312 | rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); |
313 | if (rc || totlen != length) { |
314 | JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", |
315 | rc, totlen, length, phys_ofs); |
316 | rc = rc ? rc : -EIO; |
317 | if (length) |
318 | jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); |
319 | |
320 | return rc; |
321 | } |
322 | /* success */ |
323 | jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); |
324 | |
325 | dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", |
326 | xd->xid, xd->version, xd->xprefix, xd->xname); |
327 | |
328 | return 0; |
329 | } |
330 | |
331 | static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, |
332 | int xprefix, const char *xname, |
333 | const char *xvalue, int xsize) |
334 | { |
335 | /* must be called under down_write(xattr_sem) */ |
336 | struct jffs2_xattr_datum *xd; |
337 | uint32_t hashkey, name_len; |
338 | char *data; |
339 | int i, rc; |
340 | |
341 | /* Search xattr_datum has same xname/xvalue by index */ |
342 | hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); |
343 | i = hashkey % XATTRINDEX_HASHSIZE; |
344 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { |
345 | if (xd->hashkey==hashkey |
346 | && xd->xprefix==xprefix |
347 | && xd->value_len==xsize |
348 | && !strcmp(xd->xname, xname) |
349 | && !memcmp(xd->xvalue, xvalue, xsize)) { |
350 | atomic_inc(&xd->refcnt); |
351 | return xd; |
352 | } |
353 | } |
354 | |
355 | /* Not found, Create NEW XATTR-Cache */ |
356 | name_len = strlen(xname); |
357 | |
358 | xd = jffs2_alloc_xattr_datum(); |
359 | if (!xd) |
360 | return ERR_PTR(-ENOMEM); |
361 | |
362 | data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); |
363 | if (!data) { |
364 | jffs2_free_xattr_datum(xd); |
365 | return ERR_PTR(-ENOMEM); |
366 | } |
367 | strcpy(data, xname); |
368 | memcpy(data + name_len + 1, xvalue, xsize); |
369 | |
370 | atomic_set(&xd->refcnt, 1); |
371 | xd->xid = ++c->highest_xid; |
372 | xd->flags |= JFFS2_XFLAGS_HOT; |
373 | xd->xprefix = xprefix; |
374 | |
375 | xd->hashkey = hashkey; |
376 | xd->xname = data; |
377 | xd->xvalue = data + name_len + 1; |
378 | xd->name_len = name_len; |
379 | xd->value_len = xsize; |
380 | xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); |
381 | |
382 | rc = save_xattr_datum(c, xd); |
383 | if (rc) { |
384 | kfree(xd->xname); |
385 | jffs2_free_xattr_datum(xd); |
386 | return ERR_PTR(rc); |
387 | } |
388 | |
389 | /* Insert Hash Index */ |
390 | i = hashkey % XATTRINDEX_HASHSIZE; |
391 | list_add(&xd->xindex, &c->xattrindex[i]); |
392 | |
393 | c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); |
394 | reclaim_xattr_datum(c); |
395 | |
396 | return xd; |
397 | } |
398 | |
399 | static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
400 | { |
401 | /* must be called under down_write(xattr_sem) */ |
402 | if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { |
403 | unload_xattr_datum(c, xd); |
404 | xd->flags |= JFFS2_XFLAGS_DEAD; |
405 | if (xd->node == (void *)xd) { |
406 | BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); |
407 | jffs2_free_xattr_datum(xd); |
408 | } else { |
409 | list_add(&xd->xindex, &c->xattr_dead_list); |
410 | } |
411 | spin_unlock(&c->erase_completion_lock); |
412 | |
413 | dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", |
414 | xd->xid, xd->version); |
415 | } |
416 | } |
417 | |
418 | /* -------- xref related functions ------------------ |
419 | * verify_xattr_ref(c, ref) |
420 | * is used to load xref information from medium. Because summary data does not |
421 | * contain xid/ino, it's necessary to verify once while mounting process. |
422 | * save_xattr_ref(c, ref) |
423 | * is used to write xref to medium. If delete marker is marked, it write |
424 | * a delete marker of xref into medium. |
425 | * create_xattr_ref(c, ic, xd) |
426 | * is used to create a new xref and write to medium. |
427 | * delete_xattr_ref(c, ref) |
428 | * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, |
429 | * and allows GC to reclaim those physical nodes. |
430 | * jffs2_xattr_delete_inode(c, ic) |
431 | * is called to remove xrefs related to obsolete inode when inode is unlinked. |
432 | * jffs2_xattr_free_inode(c, ic) |
433 | * is called to release xattr related objects when unmounting. |
434 | * check_xattr_ref_inode(c, ic) |
435 | * is used to confirm inode does not have duplicate xattr name/value pair. |
436 | * -------------------------------------------------- */ |
437 | static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
438 | { |
439 | struct jffs2_eraseblock *jeb; |
440 | struct jffs2_raw_node_ref *raw; |
441 | struct jffs2_raw_xref rr; |
442 | size_t readlen; |
443 | uint32_t crc, offset, totlen; |
444 | int rc; |
445 | |
446 | spin_lock(&c->erase_completion_lock); |
447 | if (ref_flags(ref->node) != REF_UNCHECKED) |
448 | goto complete; |
449 | offset = ref_offset(ref->node); |
450 | spin_unlock(&c->erase_completion_lock); |
451 | |
452 | rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); |
453 | if (rc || sizeof(rr) != readlen) { |
454 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", |
455 | rc, sizeof(rr), readlen, offset); |
456 | return rc ? rc : -EIO; |
457 | } |
458 | /* obsolete node */ |
459 | crc = crc32(0, &rr, sizeof(rr) - 4); |
460 | if (crc != je32_to_cpu(rr.node_crc)) { |
461 | JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
462 | offset, je32_to_cpu(rr.node_crc), crc); |
463 | return EIO; |
464 | } |
465 | if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK |
466 | || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF |
467 | || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { |
468 | JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " |
469 | "nodetype=%#04x/%#04x, totlen=%u/%zu\n", |
470 | offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, |
471 | je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, |
472 | je32_to_cpu(rr.totlen), PAD(sizeof(rr))); |
473 | return EIO; |
474 | } |
475 | ref->ino = je32_to_cpu(rr.ino); |
476 | ref->xid = je32_to_cpu(rr.xid); |
477 | ref->xseqno = je32_to_cpu(rr.xseqno); |
478 | if (ref->xseqno > c->highest_xseqno) |
479 | c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); |
480 | |
481 | spin_lock(&c->erase_completion_lock); |
482 | complete: |
483 | for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { |
484 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; |
485 | totlen = PAD(ref_totlen(c, jeb, raw)); |
486 | if (ref_flags(raw) == REF_UNCHECKED) { |
487 | c->unchecked_size -= totlen; c->used_size += totlen; |
488 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; |
489 | } |
490 | raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); |
491 | } |
492 | spin_unlock(&c->erase_completion_lock); |
493 | |
494 | dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", |
495 | ref->ino, ref->xid, ref_offset(ref->node)); |
496 | return 0; |
497 | } |
498 | |
499 | static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
500 | { |
501 | /* must be called under down_write(xattr_sem) */ |
502 | struct jffs2_raw_xref rr; |
503 | size_t length; |
504 | uint32_t xseqno, phys_ofs = write_ofs(c); |
505 | int ret; |
506 | |
507 | rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
508 | rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); |
509 | rr.totlen = cpu_to_je32(PAD(sizeof(rr))); |
510 | rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); |
511 | |
512 | xseqno = (c->highest_xseqno += 2); |
513 | if (is_xattr_ref_dead(ref)) { |
514 | xseqno |= XREF_DELETE_MARKER; |
515 | rr.ino = cpu_to_je32(ref->ino); |
516 | rr.xid = cpu_to_je32(ref->xid); |
517 | } else { |
518 | rr.ino = cpu_to_je32(ref->ic->ino); |
519 | rr.xid = cpu_to_je32(ref->xd->xid); |
520 | } |
521 | rr.xseqno = cpu_to_je32(xseqno); |
522 | rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); |
523 | |
524 | ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); |
525 | if (ret || sizeof(rr) != length) { |
526 | JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", |
527 | ret, sizeof(rr), length, phys_ofs); |
528 | ret = ret ? ret : -EIO; |
529 | if (length) |
530 | jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); |
531 | |
532 | return ret; |
533 | } |
534 | /* success */ |
535 | ref->xseqno = xseqno; |
536 | jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); |
537 | |
538 | dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); |
539 | |
540 | return 0; |
541 | } |
542 | |
543 | static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, |
544 | struct jffs2_xattr_datum *xd) |
545 | { |
546 | /* must be called under down_write(xattr_sem) */ |
547 | struct jffs2_xattr_ref *ref; |
548 | int ret; |
549 | |
550 | ref = jffs2_alloc_xattr_ref(); |
551 | if (!ref) |
552 | return ERR_PTR(-ENOMEM); |
553 | ref->ic = ic; |
554 | ref->xd = xd; |
555 | |
556 | ret = save_xattr_ref(c, ref); |
557 | if (ret) { |
558 | jffs2_free_xattr_ref(ref); |
559 | return ERR_PTR(ret); |
560 | } |
561 | |
562 | /* Chain to inode */ |
563 | ref->next = ic->xref; |
564 | ic->xref = ref; |
565 | |
566 | return ref; /* success */ |
567 | } |
568 | |
569 | static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
570 | { |
571 | /* must be called under down_write(xattr_sem) */ |
572 | struct jffs2_xattr_datum *xd; |
573 | |
574 | xd = ref->xd; |
575 | ref->xseqno |= XREF_DELETE_MARKER; |
576 | ref->ino = ref->ic->ino; |
577 | ref->xid = ref->xd->xid; |
578 | spin_lock(&c->erase_completion_lock); |
579 | ref->next = c->xref_dead_list; |
580 | c->xref_dead_list = ref; |
581 | spin_unlock(&c->erase_completion_lock); |
582 | |
583 | dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", |
584 | ref->ino, ref->xid, ref->xseqno); |
585 | |
586 | unrefer_xattr_datum(c, xd); |
587 | } |
588 | |
589 | void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
590 | { |
591 | /* It's called from jffs2_clear_inode() on inode removing. |
592 | When an inode with XATTR is removed, those XATTRs must be removed. */ |
593 | struct jffs2_xattr_ref *ref, *_ref; |
594 | |
595 | if (!ic || ic->pino_nlink > 0) |
596 | return; |
597 | |
598 | down_write(&c->xattr_sem); |
599 | for (ref = ic->xref; ref; ref = _ref) { |
600 | _ref = ref->next; |
601 | delete_xattr_ref(c, ref); |
602 | } |
603 | ic->xref = NULL; |
604 | up_write(&c->xattr_sem); |
605 | } |
606 | |
607 | void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
608 | { |
609 | /* It's called from jffs2_free_ino_caches() until unmounting FS. */ |
610 | struct jffs2_xattr_datum *xd; |
611 | struct jffs2_xattr_ref *ref, *_ref; |
612 | |
613 | down_write(&c->xattr_sem); |
614 | for (ref = ic->xref; ref; ref = _ref) { |
615 | _ref = ref->next; |
616 | xd = ref->xd; |
617 | if (atomic_dec_and_test(&xd->refcnt)) { |
618 | unload_xattr_datum(c, xd); |
619 | jffs2_free_xattr_datum(xd); |
620 | } |
621 | jffs2_free_xattr_ref(ref); |
622 | } |
623 | ic->xref = NULL; |
624 | up_write(&c->xattr_sem); |
625 | } |
626 | |
627 | static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
628 | { |
629 | /* success of check_xattr_ref_inode() means taht inode (ic) dose not have |
630 | * duplicate name/value pairs. If duplicate name/value pair would be found, |
631 | * one will be removed. |
632 | */ |
633 | struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; |
634 | int rc = 0; |
635 | |
636 | if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) |
637 | return 0; |
638 | down_write(&c->xattr_sem); |
639 | retry: |
640 | rc = 0; |
641 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
642 | if (!ref->xd->xname) { |
643 | rc = load_xattr_datum(c, ref->xd); |
644 | if (unlikely(rc > 0)) { |
645 | *pref = ref->next; |
646 | delete_xattr_ref(c, ref); |
647 | goto retry; |
648 | } else if (unlikely(rc < 0)) |
649 | goto out; |
650 | } |
651 | for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { |
652 | if (!cmp->xd->xname) { |
653 | ref->xd->flags |= JFFS2_XFLAGS_BIND; |
654 | rc = load_xattr_datum(c, cmp->xd); |
655 | ref->xd->flags &= ~JFFS2_XFLAGS_BIND; |
656 | if (unlikely(rc > 0)) { |
657 | *pcmp = cmp->next; |
658 | delete_xattr_ref(c, cmp); |
659 | goto retry; |
660 | } else if (unlikely(rc < 0)) |
661 | goto out; |
662 | } |
663 | if (ref->xd->xprefix == cmp->xd->xprefix |
664 | && !strcmp(ref->xd->xname, cmp->xd->xname)) { |
665 | if (ref->xseqno > cmp->xseqno) { |
666 | *pcmp = cmp->next; |
667 | delete_xattr_ref(c, cmp); |
668 | } else { |
669 | *pref = ref->next; |
670 | delete_xattr_ref(c, ref); |
671 | } |
672 | goto retry; |
673 | } |
674 | } |
675 | } |
676 | ic->flags |= INO_FLAGS_XATTR_CHECKED; |
677 | out: |
678 | up_write(&c->xattr_sem); |
679 | |
680 | return rc; |
681 | } |
682 | |
683 | /* -------- xattr subsystem functions --------------- |
684 | * jffs2_init_xattr_subsystem(c) |
685 | * is used to initialize semaphore and list_head, and some variables. |
686 | * jffs2_find_xattr_datum(c, xid) |
687 | * is used to lookup xdatum while scanning process. |
688 | * jffs2_clear_xattr_subsystem(c) |
689 | * is used to release any xattr related objects. |
690 | * jffs2_build_xattr_subsystem(c) |
691 | * is used to associate xdatum and xref while super block building process. |
692 | * jffs2_setup_xattr_datum(c, xid, version) |
693 | * is used to insert xdatum while scanning process. |
694 | * -------------------------------------------------- */ |
695 | void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) |
696 | { |
697 | int i; |
698 | |
699 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) |
700 | INIT_LIST_HEAD(&c->xattrindex[i]); |
701 | INIT_LIST_HEAD(&c->xattr_unchecked); |
702 | INIT_LIST_HEAD(&c->xattr_dead_list); |
703 | c->xref_dead_list = NULL; |
704 | c->xref_temp = NULL; |
705 | |
706 | init_rwsem(&c->xattr_sem); |
707 | c->highest_xid = 0; |
708 | c->highest_xseqno = 0; |
709 | c->xdatum_mem_usage = 0; |
710 | c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ |
711 | } |
712 | |
713 | static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) |
714 | { |
715 | struct jffs2_xattr_datum *xd; |
716 | int i = xid % XATTRINDEX_HASHSIZE; |
717 | |
718 | /* It's only used in scanning/building process. */ |
719 | BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); |
720 | |
721 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { |
722 | if (xd->xid==xid) |
723 | return xd; |
724 | } |
725 | return NULL; |
726 | } |
727 | |
728 | void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) |
729 | { |
730 | struct jffs2_xattr_datum *xd, *_xd; |
731 | struct jffs2_xattr_ref *ref, *_ref; |
732 | int i; |
733 | |
734 | for (ref=c->xref_temp; ref; ref = _ref) { |
735 | _ref = ref->next; |
736 | jffs2_free_xattr_ref(ref); |
737 | } |
738 | |
739 | for (ref=c->xref_dead_list; ref; ref = _ref) { |
740 | _ref = ref->next; |
741 | jffs2_free_xattr_ref(ref); |
742 | } |
743 | |
744 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { |
745 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { |
746 | list_del(&xd->xindex); |
747 | if (xd->xname) |
748 | kfree(xd->xname); |
749 | jffs2_free_xattr_datum(xd); |
750 | } |
751 | } |
752 | |
753 | list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { |
754 | list_del(&xd->xindex); |
755 | jffs2_free_xattr_datum(xd); |
756 | } |
757 | list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { |
758 | list_del(&xd->xindex); |
759 | jffs2_free_xattr_datum(xd); |
760 | } |
761 | } |
762 | |
763 | #define XREF_TMPHASH_SIZE (128) |
764 | void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) |
765 | { |
766 | struct jffs2_xattr_ref *ref, *_ref; |
767 | struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; |
768 | struct jffs2_xattr_datum *xd, *_xd; |
769 | struct jffs2_inode_cache *ic; |
770 | struct jffs2_raw_node_ref *raw; |
771 | int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; |
772 | int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; |
773 | |
774 | BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); |
775 | |
776 | /* Phase.1 : Merge same xref */ |
777 | for (i=0; i < XREF_TMPHASH_SIZE; i++) |
778 | xref_tmphash[i] = NULL; |
779 | for (ref=c->xref_temp; ref; ref=_ref) { |
780 | struct jffs2_xattr_ref *tmp; |
781 | |
782 | _ref = ref->next; |
783 | if (ref_flags(ref->node) != REF_PRISTINE) { |
784 | if (verify_xattr_ref(c, ref)) { |
785 | BUG_ON(ref->node->next_in_ino != (void *)ref); |
786 | ref->node->next_in_ino = NULL; |
787 | jffs2_mark_node_obsolete(c, ref->node); |
788 | jffs2_free_xattr_ref(ref); |
789 | continue; |
790 | } |
791 | } |
792 | |
793 | i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; |
794 | for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { |
795 | if (tmp->ino == ref->ino && tmp->xid == ref->xid) |
796 | break; |
797 | } |
798 | if (tmp) { |
799 | raw = ref->node; |
800 | if (ref->xseqno > tmp->xseqno) { |
801 | tmp->xseqno = ref->xseqno; |
802 | raw->next_in_ino = tmp->node; |
803 | tmp->node = raw; |
804 | } else { |
805 | raw->next_in_ino = tmp->node->next_in_ino; |
806 | tmp->node->next_in_ino = raw; |
807 | } |
808 | jffs2_free_xattr_ref(ref); |
809 | continue; |
810 | } else { |
811 | ref->next = xref_tmphash[i]; |
812 | xref_tmphash[i] = ref; |
813 | } |
814 | } |
815 | c->xref_temp = NULL; |
816 | |
817 | /* Phase.2 : Bind xref with inode_cache and xattr_datum */ |
818 | for (i=0; i < XREF_TMPHASH_SIZE; i++) { |
819 | for (ref=xref_tmphash[i]; ref; ref=_ref) { |
820 | xref_count++; |
821 | _ref = ref->next; |
822 | if (is_xattr_ref_dead(ref)) { |
823 | ref->next = c->xref_dead_list; |
824 | c->xref_dead_list = ref; |
825 | xref_dead_count++; |
826 | continue; |
827 | } |
828 | /* At this point, ref->xid and ref->ino contain XID and inode number. |
829 | ref->xd and ref->ic are not valid yet. */ |
830 | xd = jffs2_find_xattr_datum(c, ref->xid); |
831 | ic = jffs2_get_ino_cache(c, ref->ino); |
832 | if (!xd || !ic || !ic->pino_nlink) { |
833 | dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", |
834 | ref->ino, ref->xid, ref->xseqno); |
835 | ref->xseqno |= XREF_DELETE_MARKER; |
836 | ref->next = c->xref_dead_list; |
837 | c->xref_dead_list = ref; |
838 | xref_orphan_count++; |
839 | continue; |
840 | } |
841 | ref->xd = xd; |
842 | ref->ic = ic; |
843 | atomic_inc(&xd->refcnt); |
844 | ref->next = ic->xref; |
845 | ic->xref = ref; |
846 | } |
847 | } |
848 | |
849 | /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ |
850 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { |
851 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { |
852 | xdatum_count++; |
853 | list_del_init(&xd->xindex); |
854 | if (!atomic_read(&xd->refcnt)) { |
855 | dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", |
856 | xd->xid, xd->version); |
857 | xd->flags |= JFFS2_XFLAGS_DEAD; |
858 | list_add(&xd->xindex, &c->xattr_unchecked); |
859 | xdatum_orphan_count++; |
860 | continue; |
861 | } |
862 | if (is_xattr_datum_unchecked(c, xd)) { |
863 | dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", |
864 | xd->xid, xd->version); |
865 | list_add(&xd->xindex, &c->xattr_unchecked); |
866 | xdatum_unchecked_count++; |
867 | } |
868 | } |
869 | } |
870 | /* build complete */ |
871 | JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" |
872 | " (%u unchecked, %u orphan) and " |
873 | "%u of xref (%u dead, %u orphan) found.\n", |
874 | xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, |
875 | xref_count, xref_dead_count, xref_orphan_count); |
876 | } |
877 | |
878 | struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, |
879 | uint32_t xid, uint32_t version) |
880 | { |
881 | struct jffs2_xattr_datum *xd; |
882 | |
883 | xd = jffs2_find_xattr_datum(c, xid); |
884 | if (!xd) { |
885 | xd = jffs2_alloc_xattr_datum(); |
886 | if (!xd) |
887 | return ERR_PTR(-ENOMEM); |
888 | xd->xid = xid; |
889 | xd->version = version; |
890 | if (xd->xid > c->highest_xid) |
891 | c->highest_xid = xd->xid; |
892 | list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); |
893 | } |
894 | return xd; |
895 | } |
896 | |
897 | /* -------- xattr subsystem functions --------------- |
898 | * xprefix_to_handler(xprefix) |
899 | * is used to translate xprefix into xattr_handler. |
900 | * jffs2_listxattr(dentry, buffer, size) |
901 | * is an implementation of listxattr handler on jffs2. |
902 | * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) |
903 | * is an implementation of getxattr handler on jffs2. |
904 | * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) |
905 | * is an implementation of setxattr handler on jffs2. |
906 | * -------------------------------------------------- */ |
907 | struct xattr_handler *jffs2_xattr_handlers[] = { |
908 | &jffs2_user_xattr_handler, |
909 | #ifdef CONFIG_JFFS2_FS_SECURITY |
910 | &jffs2_security_xattr_handler, |
911 | #endif |
912 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL |
913 | &jffs2_acl_access_xattr_handler, |
914 | &jffs2_acl_default_xattr_handler, |
915 | #endif |
916 | &jffs2_trusted_xattr_handler, |
917 | NULL |
918 | }; |
919 | |
920 | static struct xattr_handler *xprefix_to_handler(int xprefix) { |
921 | struct xattr_handler *ret; |
922 | |
923 | switch (xprefix) { |
924 | case JFFS2_XPREFIX_USER: |
925 | ret = &jffs2_user_xattr_handler; |
926 | break; |
927 | #ifdef CONFIG_JFFS2_FS_SECURITY |
928 | case JFFS2_XPREFIX_SECURITY: |
929 | ret = &jffs2_security_xattr_handler; |
930 | break; |
931 | #endif |
932 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL |
933 | case JFFS2_XPREFIX_ACL_ACCESS: |
934 | ret = &jffs2_acl_access_xattr_handler; |
935 | break; |
936 | case JFFS2_XPREFIX_ACL_DEFAULT: |
937 | ret = &jffs2_acl_default_xattr_handler; |
938 | break; |
939 | #endif |
940 | case JFFS2_XPREFIX_TRUSTED: |
941 | ret = &jffs2_trusted_xattr_handler; |
942 | break; |
943 | default: |
944 | ret = NULL; |
945 | break; |
946 | } |
947 | return ret; |
948 | } |
949 | |
950 | ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) |
951 | { |
952 | struct inode *inode = dentry->d_inode; |
953 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
954 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
955 | struct jffs2_inode_cache *ic = f->inocache; |
956 | struct jffs2_xattr_ref *ref, **pref; |
957 | struct jffs2_xattr_datum *xd; |
958 | struct xattr_handler *xhandle; |
959 | ssize_t len, rc; |
960 | int retry = 0; |
961 | |
962 | rc = check_xattr_ref_inode(c, ic); |
963 | if (unlikely(rc)) |
964 | return rc; |
965 | |
966 | down_read(&c->xattr_sem); |
967 | retry: |
968 | len = 0; |
969 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
970 | BUG_ON(ref->ic != ic); |
971 | xd = ref->xd; |
972 | if (!xd->xname) { |
973 | /* xdatum is unchached */ |
974 | if (!retry) { |
975 | retry = 1; |
976 | up_read(&c->xattr_sem); |
977 | down_write(&c->xattr_sem); |
978 | goto retry; |
979 | } else { |
980 | rc = load_xattr_datum(c, xd); |
981 | if (unlikely(rc > 0)) { |
982 | *pref = ref->next; |
983 | delete_xattr_ref(c, ref); |
984 | goto retry; |
985 | } else if (unlikely(rc < 0)) |
986 | goto out; |
987 | } |
988 | } |
989 | xhandle = xprefix_to_handler(xd->xprefix); |
990 | if (!xhandle) |
991 | continue; |
992 | if (buffer) { |
993 | rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len); |
994 | } else { |
995 | rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len); |
996 | } |
997 | if (rc < 0) |
998 | goto out; |
999 | len += rc; |
1000 | } |
1001 | rc = len; |
1002 | out: |
1003 | if (!retry) { |
1004 | up_read(&c->xattr_sem); |
1005 | } else { |
1006 | up_write(&c->xattr_sem); |
1007 | } |
1008 | return rc; |
1009 | } |
1010 | |
1011 | int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, |
1012 | char *buffer, size_t size) |
1013 | { |
1014 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
1015 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
1016 | struct jffs2_inode_cache *ic = f->inocache; |
1017 | struct jffs2_xattr_datum *xd; |
1018 | struct jffs2_xattr_ref *ref, **pref; |
1019 | int rc, retry = 0; |
1020 | |
1021 | rc = check_xattr_ref_inode(c, ic); |
1022 | if (unlikely(rc)) |
1023 | return rc; |
1024 | |
1025 | down_read(&c->xattr_sem); |
1026 | retry: |
1027 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
1028 | BUG_ON(ref->ic!=ic); |
1029 | |
1030 | xd = ref->xd; |
1031 | if (xd->xprefix != xprefix) |
1032 | continue; |
1033 | if (!xd->xname) { |
1034 | /* xdatum is unchached */ |
1035 | if (!retry) { |
1036 | retry = 1; |
1037 | up_read(&c->xattr_sem); |
1038 | down_write(&c->xattr_sem); |
1039 | goto retry; |
1040 | } else { |
1041 | rc = load_xattr_datum(c, xd); |
1042 | if (unlikely(rc > 0)) { |
1043 | *pref = ref->next; |
1044 | delete_xattr_ref(c, ref); |
1045 | goto retry; |
1046 | } else if (unlikely(rc < 0)) { |
1047 | goto out; |
1048 | } |
1049 | } |
1050 | } |
1051 | if (!strcmp(xname, xd->xname)) { |
1052 | rc = xd->value_len; |
1053 | if (buffer) { |
1054 | if (size < rc) { |
1055 | rc = -ERANGE; |
1056 | } else { |
1057 | memcpy(buffer, xd->xvalue, rc); |
1058 | } |
1059 | } |
1060 | goto out; |
1061 | } |
1062 | } |
1063 | rc = -ENODATA; |
1064 | out: |
1065 | if (!retry) { |
1066 | up_read(&c->xattr_sem); |
1067 | } else { |
1068 | up_write(&c->xattr_sem); |
1069 | } |
1070 | return rc; |
1071 | } |
1072 | |
1073 | int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, |
1074 | const char *buffer, size_t size, int flags) |
1075 | { |
1076 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
1077 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
1078 | struct jffs2_inode_cache *ic = f->inocache; |
1079 | struct jffs2_xattr_datum *xd; |
1080 | struct jffs2_xattr_ref *ref, *newref, **pref; |
1081 | uint32_t length, request; |
1082 | int rc; |
1083 | |
1084 | rc = check_xattr_ref_inode(c, ic); |
1085 | if (unlikely(rc)) |
1086 | return rc; |
1087 | |
1088 | request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); |
1089 | rc = jffs2_reserve_space(c, request, &length, |
1090 | ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); |
1091 | if (rc) { |
1092 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); |
1093 | return rc; |
1094 | } |
1095 | |
1096 | /* Find existing xattr */ |
1097 | down_write(&c->xattr_sem); |
1098 | retry: |
1099 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
1100 | xd = ref->xd; |
1101 | if (xd->xprefix != xprefix) |
1102 | continue; |
1103 | if (!xd->xname) { |
1104 | rc = load_xattr_datum(c, xd); |
1105 | if (unlikely(rc > 0)) { |
1106 | *pref = ref->next; |
1107 | delete_xattr_ref(c, ref); |
1108 | goto retry; |
1109 | } else if (unlikely(rc < 0)) |
1110 | goto out; |
1111 | } |
1112 | if (!strcmp(xd->xname, xname)) { |
1113 | if (flags & XATTR_CREATE) { |
1114 | rc = -EEXIST; |
1115 | goto out; |
1116 | } |
1117 | if (!buffer) { |
1118 | ref->ino = ic->ino; |
1119 | ref->xid = xd->xid; |
1120 | ref->xseqno |= XREF_DELETE_MARKER; |
1121 | rc = save_xattr_ref(c, ref); |
1122 | if (!rc) { |
1123 | *pref = ref->next; |
1124 | spin_lock(&c->erase_completion_lock); |
1125 | ref->next = c->xref_dead_list; |
1126 | c->xref_dead_list = ref; |
1127 | spin_unlock(&c->erase_completion_lock); |
1128 | unrefer_xattr_datum(c, xd); |
1129 | } else { |
1130 | ref->ic = ic; |
1131 | ref->xd = xd; |
1132 | ref->xseqno &= ~XREF_DELETE_MARKER; |
1133 | } |
1134 | goto out; |
1135 | } |
1136 | goto found; |
1137 | } |
1138 | } |
1139 | /* not found */ |
1140 | if (flags & XATTR_REPLACE) { |
1141 | rc = -ENODATA; |
1142 | goto out; |
1143 | } |
1144 | if (!buffer) { |
1145 | rc = -ENODATA; |
1146 | goto out; |
1147 | } |
1148 | found: |
1149 | xd = create_xattr_datum(c, xprefix, xname, buffer, size); |
1150 | if (IS_ERR(xd)) { |
1151 | rc = PTR_ERR(xd); |
1152 | goto out; |
1153 | } |
1154 | up_write(&c->xattr_sem); |
1155 | jffs2_complete_reservation(c); |
1156 | |
1157 | /* create xattr_ref */ |
1158 | request = PAD(sizeof(struct jffs2_raw_xref)); |
1159 | rc = jffs2_reserve_space(c, request, &length, |
1160 | ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); |
1161 | down_write(&c->xattr_sem); |
1162 | if (rc) { |
1163 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); |
1164 | unrefer_xattr_datum(c, xd); |
1165 | up_write(&c->xattr_sem); |
1166 | return rc; |
1167 | } |
1168 | if (ref) |
1169 | *pref = ref->next; |
1170 | newref = create_xattr_ref(c, ic, xd); |
1171 | if (IS_ERR(newref)) { |
1172 | if (ref) { |
1173 | ref->next = ic->xref; |
1174 | ic->xref = ref; |
1175 | } |
1176 | rc = PTR_ERR(newref); |
1177 | unrefer_xattr_datum(c, xd); |
1178 | } else if (ref) { |
1179 | delete_xattr_ref(c, ref); |
1180 | } |
1181 | out: |
1182 | up_write(&c->xattr_sem); |
1183 | jffs2_complete_reservation(c); |
1184 | return rc; |
1185 | } |
1186 | |
1187 | /* -------- garbage collector functions ------------- |
1188 | * jffs2_garbage_collect_xattr_datum(c, xd, raw) |
1189 | * is used to move xdatum into new node. |
1190 | * jffs2_garbage_collect_xattr_ref(c, ref, raw) |
1191 | * is used to move xref into new node. |
1192 | * jffs2_verify_xattr(c) |
1193 | * is used to call do_verify_xattr_datum() before garbage collecting. |
1194 | * jffs2_release_xattr_datum(c, xd) |
1195 | * is used to release an in-memory object of xdatum. |
1196 | * jffs2_release_xattr_ref(c, ref) |
1197 | * is used to release an in-memory object of xref. |
1198 | * -------------------------------------------------- */ |
1199 | int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, |
1200 | struct jffs2_raw_node_ref *raw) |
1201 | { |
1202 | uint32_t totlen, length, old_ofs; |
1203 | int rc = 0; |
1204 | |
1205 | down_write(&c->xattr_sem); |
1206 | if (xd->node != raw) |
1207 | goto out; |
1208 | if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) |
1209 | goto out; |
1210 | |
1211 | rc = load_xattr_datum(c, xd); |
1212 | if (unlikely(rc)) { |
1213 | rc = (rc > 0) ? 0 : rc; |
1214 | goto out; |
1215 | } |
1216 | old_ofs = ref_offset(xd->node); |
1217 | totlen = PAD(sizeof(struct jffs2_raw_xattr) |
1218 | + xd->name_len + 1 + xd->value_len); |
1219 | rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); |
1220 | if (rc) { |
1221 | JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); |
1222 | goto out; |
1223 | } |
1224 | rc = save_xattr_datum(c, xd); |
1225 | if (!rc) |
1226 | dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", |
1227 | xd->xid, xd->version, old_ofs, ref_offset(xd->node)); |
1228 | out: |
1229 | if (!rc) |
1230 | jffs2_mark_node_obsolete(c, raw); |
1231 | up_write(&c->xattr_sem); |
1232 | return rc; |
1233 | } |
1234 | |
1235 | int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, |
1236 | struct jffs2_raw_node_ref *raw) |
1237 | { |
1238 | uint32_t totlen, length, old_ofs; |
1239 | int rc = 0; |
1240 | |
1241 | down_write(&c->xattr_sem); |
1242 | BUG_ON(!ref->node); |
1243 | |
1244 | if (ref->node != raw) |
1245 | goto out; |
1246 | if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) |
1247 | goto out; |
1248 | |
1249 | old_ofs = ref_offset(ref->node); |
1250 | totlen = ref_totlen(c, c->gcblock, ref->node); |
1251 | |
1252 | rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); |
1253 | if (rc) { |
1254 | JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", |
1255 | __func__, rc, totlen); |
1256 | rc = rc ? rc : -EBADFD; |
1257 | goto out; |
1258 | } |
1259 | rc = save_xattr_ref(c, ref); |
1260 | if (!rc) |
1261 | dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", |
1262 | ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); |
1263 | out: |
1264 | if (!rc) |
1265 | jffs2_mark_node_obsolete(c, raw); |
1266 | up_write(&c->xattr_sem); |
1267 | return rc; |
1268 | } |
1269 | |
1270 | int jffs2_verify_xattr(struct jffs2_sb_info *c) |
1271 | { |
1272 | struct jffs2_xattr_datum *xd, *_xd; |
1273 | struct jffs2_eraseblock *jeb; |
1274 | struct jffs2_raw_node_ref *raw; |
1275 | uint32_t totlen; |
1276 | int rc; |
1277 | |
1278 | down_write(&c->xattr_sem); |
1279 | list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { |
1280 | rc = do_verify_xattr_datum(c, xd); |
1281 | if (rc < 0) |
1282 | continue; |
1283 | list_del_init(&xd->xindex); |
1284 | spin_lock(&c->erase_completion_lock); |
1285 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { |
1286 | if (ref_flags(raw) != REF_UNCHECKED) |
1287 | continue; |
1288 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; |
1289 | totlen = PAD(ref_totlen(c, jeb, raw)); |
1290 | c->unchecked_size -= totlen; c->used_size += totlen; |
1291 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; |
1292 | raw->flash_offset = ref_offset(raw) |
1293 | | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); |
1294 | } |
1295 | if (xd->flags & JFFS2_XFLAGS_DEAD) |
1296 | list_add(&xd->xindex, &c->xattr_dead_list); |
1297 | spin_unlock(&c->erase_completion_lock); |
1298 | } |
1299 | up_write(&c->xattr_sem); |
1300 | return list_empty(&c->xattr_unchecked) ? 1 : 0; |
1301 | } |
1302 | |
1303 | void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
1304 | { |
1305 | /* must be called under spin_lock(&c->erase_completion_lock) */ |
1306 | if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) |
1307 | return; |
1308 | |
1309 | list_del(&xd->xindex); |
1310 | jffs2_free_xattr_datum(xd); |
1311 | } |
1312 | |
1313 | void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
1314 | { |
1315 | /* must be called under spin_lock(&c->erase_completion_lock) */ |
1316 | struct jffs2_xattr_ref *tmp, **ptmp; |
1317 | |
1318 | if (ref->node != (void *)ref) |
1319 | return; |
1320 | |
1321 | for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { |
1322 | if (ref == tmp) { |
1323 | *ptmp = tmp->next; |
1324 | break; |
1325 | } |
1326 | } |
1327 | jffs2_free_xattr_ref(ref); |
1328 | } |
1329 |
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9