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652ecc20 KK |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
aa98d7cf | 3 | * |
652ecc20 | 4 | * Copyright (C) 2006 NEC Corporation |
aa98d7cf | 5 | * |
652ecc20 KK |
6 | * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
10 | */ | |
aa98d7cf KK |
11 | #include <linux/kernel.h> |
12 | #include <linux/slab.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/time.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/highmem.h> | |
17 | #include <linux/crc32.h> | |
18 | #include <linux/jffs2.h> | |
19 | #include <linux/xattr.h> | |
20 | #include <linux/mtd/mtd.h> | |
21 | #include "nodelist.h" | |
22 | /* -------- xdatum related functions ---------------- | |
23 | * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) | |
24 | * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is | |
25 | * the index of the xattr name/value pair cache (c->xattrindex). | |
26 | * unload_xattr_datum(c, xd) | |
27 | * is used to release xattr name/value pair and detach from c->xattrindex. | |
28 | * reclaim_xattr_datum(c) | |
29 | * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when | |
30 | * memory usage by cache is over c->xdatum_mem_threshold. Currentry, this threshold | |
31 | * is hard coded as 32KiB. | |
32 | * delete_xattr_datum_node(c, xd) | |
33 | * is used to delete a jffs2 node is dominated by xdatum. When EBS(Erase Block Summary) is | |
34 | * enabled, it overwrites the obsolete node by myself. | |
35 | * delete_xattr_datum(c, xd) | |
36 | * is used to delete jffs2_xattr_datum object. It must be called with 0-value of reference | |
37 | * counter. (It means how many jffs2_xattr_ref object refers this xdatum.) | |
38 | * do_verify_xattr_datum(c, xd) | |
39 | * is used to load the xdatum informations without name/value pair from the medium. | |
40 | * It's necessary once, because those informations are not collected during mounting | |
41 | * process when EBS is enabled. | |
42 | * 0 will be returned, if success. An negative return value means recoverable error, and | |
43 | * positive return value means unrecoverable error. Thus, caller must remove this xdatum | |
44 | * and xref when it returned positive value. | |
45 | * do_load_xattr_datum(c, xd) | |
46 | * is used to load name/value pair from the medium. | |
47 | * The meanings of return value is same as do_verify_xattr_datum(). | |
48 | * load_xattr_datum(c, xd) | |
49 | * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). | |
50 | * If xd need to call do_verify_xattr_datum() at first, it's called before calling | |
51 | * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). | |
52 | * save_xattr_datum(c, xd, phys_ofs) | |
53 | * is used to write xdatum to medium. xd->version will be incremented. | |
54 | * create_xattr_datum(c, xprefix, xname, xvalue, xsize, phys_ofs) | |
55 | * is used to create new xdatum and write to medium. | |
56 | * -------------------------------------------------- */ | |
57 | ||
58 | static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) | |
59 | { | |
60 | int name_len = strlen(xname); | |
61 | ||
62 | return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); | |
63 | } | |
64 | ||
65 | static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
66 | { | |
67 | /* must be called under down_write(xattr_sem) */ | |
68 | D1(dbg_xattr("%s: xid=%u, version=%u\n", __FUNCTION__, xd->xid, xd->version)); | |
69 | if (xd->xname) { | |
70 | c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); | |
71 | kfree(xd->xname); | |
72 | } | |
73 | ||
74 | list_del_init(&xd->xindex); | |
75 | xd->hashkey = 0; | |
76 | xd->xname = NULL; | |
77 | xd->xvalue = NULL; | |
78 | } | |
79 | ||
80 | static void reclaim_xattr_datum(struct jffs2_sb_info *c) | |
81 | { | |
82 | /* must be called under down_write(xattr_sem) */ | |
83 | struct jffs2_xattr_datum *xd, *_xd; | |
84 | uint32_t target, before; | |
85 | static int index = 0; | |
86 | int count; | |
87 | ||
88 | if (c->xdatum_mem_threshold > c->xdatum_mem_usage) | |
89 | return; | |
90 | ||
91 | before = c->xdatum_mem_usage; | |
92 | target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ | |
93 | for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { | |
94 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { | |
95 | if (xd->flags & JFFS2_XFLAGS_HOT) { | |
96 | xd->flags &= ~JFFS2_XFLAGS_HOT; | |
97 | } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { | |
98 | unload_xattr_datum(c, xd); | |
99 | } | |
100 | if (c->xdatum_mem_usage <= target) | |
101 | goto out; | |
102 | } | |
103 | index = (index+1) % XATTRINDEX_HASHSIZE; | |
104 | } | |
105 | out: | |
106 | JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", | |
107 | before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); | |
108 | } | |
109 | ||
110 | static void delete_xattr_datum_node(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
111 | { | |
112 | /* must be called under down_write(xattr_sem) */ | |
113 | struct jffs2_raw_xattr rx; | |
114 | uint32_t length; | |
115 | int rc; | |
116 | ||
117 | if (!xd->node) { | |
118 | JFFS2_WARNING("xdatum (xid=%u) is removed twice.\n", xd->xid); | |
119 | return; | |
120 | } | |
121 | if (jffs2_sum_active()) { | |
122 | memset(&rx, 0xff, sizeof(struct jffs2_raw_xattr)); | |
123 | rc = jffs2_flash_read(c, ref_offset(xd->node), | |
124 | sizeof(struct jffs2_unknown_node), | |
125 | &length, (char *)&rx); | |
126 | if (rc || length != sizeof(struct jffs2_unknown_node)) { | |
127 | JFFS2_ERROR("jffs2_flash_read()=%d, req=%u, read=%u at %#08x\n", | |
128 | rc, sizeof(struct jffs2_unknown_node), | |
129 | length, ref_offset(xd->node)); | |
130 | } | |
131 | rc = jffs2_flash_write(c, ref_offset(xd->node), sizeof(rx), | |
132 | &length, (char *)&rx); | |
133 | if (rc || length != sizeof(struct jffs2_raw_xattr)) { | |
134 | JFFS2_ERROR("jffs2_flash_write()=%d, req=%u, wrote=%u ar %#08x\n", | |
135 | rc, sizeof(rx), length, ref_offset(xd->node)); | |
136 | } | |
137 | } | |
138 | spin_lock(&c->erase_completion_lock); | |
139 | xd->node->next_in_ino = NULL; | |
140 | spin_unlock(&c->erase_completion_lock); | |
141 | jffs2_mark_node_obsolete(c, xd->node); | |
142 | xd->node = NULL; | |
143 | } | |
144 | ||
145 | static void delete_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
146 | { | |
147 | /* must be called under down_write(xattr_sem) */ | |
148 | BUG_ON(xd->refcnt); | |
149 | ||
150 | unload_xattr_datum(c, xd); | |
151 | if (xd->node) { | |
152 | delete_xattr_datum_node(c, xd); | |
153 | xd->node = NULL; | |
154 | } | |
155 | jffs2_free_xattr_datum(xd); | |
156 | } | |
157 | ||
158 | static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
159 | { | |
160 | /* must be called under down_write(xattr_sem) */ | |
161 | struct jffs2_eraseblock *jeb; | |
162 | struct jffs2_raw_xattr rx; | |
163 | size_t readlen; | |
164 | uint32_t crc, totlen; | |
165 | int rc; | |
166 | ||
167 | BUG_ON(!xd->node); | |
168 | BUG_ON(ref_flags(xd->node) != REF_UNCHECKED); | |
169 | ||
170 | rc = jffs2_flash_read(c, ref_offset(xd->node), sizeof(rx), &readlen, (char *)&rx); | |
171 | if (rc || readlen != sizeof(rx)) { | |
172 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%u, read=%u at %#08x\n", | |
173 | rc, sizeof(rx), readlen, ref_offset(xd->node)); | |
174 | return rc ? rc : -EIO; | |
175 | } | |
176 | crc = crc32(0, &rx, sizeof(rx) - 4); | |
177 | if (crc != je32_to_cpu(rx.node_crc)) { | |
178 | if (je32_to_cpu(rx.node_crc) != 0xffffffff) | |
179 | JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", | |
180 | ref_offset(xd->node), je32_to_cpu(rx.hdr_crc), crc); | |
181 | return EIO; | |
182 | } | |
183 | totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); | |
184 | if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK | |
185 | || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR | |
186 | || je32_to_cpu(rx.totlen) != totlen | |
187 | || je32_to_cpu(rx.xid) != xd->xid | |
188 | || je32_to_cpu(rx.version) != xd->version) { | |
189 | JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " | |
190 | "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", | |
191 | ref_offset(xd->node), je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, | |
192 | je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, | |
193 | je32_to_cpu(rx.totlen), totlen, | |
194 | je32_to_cpu(rx.xid), xd->xid, | |
195 | je32_to_cpu(rx.version), xd->version); | |
196 | return EIO; | |
197 | } | |
198 | xd->xprefix = rx.xprefix; | |
199 | xd->name_len = rx.name_len; | |
200 | xd->value_len = je16_to_cpu(rx.value_len); | |
201 | xd->data_crc = je32_to_cpu(rx.data_crc); | |
202 | ||
203 | /* This JFFS2_NODETYPE_XATTR node is checked */ | |
204 | jeb = &c->blocks[ref_offset(xd->node) / c->sector_size]; | |
205 | totlen = PAD(je32_to_cpu(rx.totlen)); | |
206 | ||
207 | spin_lock(&c->erase_completion_lock); | |
208 | c->unchecked_size -= totlen; c->used_size += totlen; | |
209 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
210 | xd->node->flash_offset = ref_offset(xd->node) | REF_PRISTINE; | |
211 | spin_unlock(&c->erase_completion_lock); | |
212 | ||
213 | /* unchecked xdatum is chained with c->xattr_unchecked */ | |
214 | list_del_init(&xd->xindex); | |
215 | ||
216 | dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n", | |
217 | xd->xid, xd->version); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
223 | { | |
224 | /* must be called under down_write(xattr_sem) */ | |
225 | char *data; | |
226 | size_t readlen; | |
227 | uint32_t crc, length; | |
228 | int i, ret, retry = 0; | |
229 | ||
230 | BUG_ON(!xd->node); | |
231 | BUG_ON(ref_flags(xd->node) != REF_PRISTINE); | |
232 | BUG_ON(!list_empty(&xd->xindex)); | |
233 | retry: | |
234 | length = xd->name_len + 1 + xd->value_len; | |
235 | data = kmalloc(length, GFP_KERNEL); | |
236 | if (!data) | |
237 | return -ENOMEM; | |
238 | ||
239 | ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), | |
240 | length, &readlen, data); | |
241 | ||
242 | if (ret || length!=readlen) { | |
243 | JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%d, at %#08x\n", | |
244 | ret, length, readlen, ref_offset(xd->node)); | |
245 | kfree(data); | |
246 | return ret ? ret : -EIO; | |
247 | } | |
248 | ||
249 | data[xd->name_len] = '\0'; | |
250 | crc = crc32(0, data, length); | |
251 | if (crc != xd->data_crc) { | |
252 | JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)" | |
253 | " at %#08x, read: 0x%08x calculated: 0x%08x\n", | |
254 | ref_offset(xd->node), xd->data_crc, crc); | |
255 | kfree(data); | |
256 | return EIO; | |
257 | } | |
258 | ||
259 | xd->flags |= JFFS2_XFLAGS_HOT; | |
260 | xd->xname = data; | |
261 | xd->xvalue = data + xd->name_len+1; | |
262 | ||
263 | c->xdatum_mem_usage += length; | |
264 | ||
265 | xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); | |
266 | i = xd->hashkey % XATTRINDEX_HASHSIZE; | |
267 | list_add(&xd->xindex, &c->xattrindex[i]); | |
268 | if (!retry) { | |
269 | retry = 1; | |
270 | reclaim_xattr_datum(c); | |
271 | if (!xd->xname) | |
272 | goto retry; | |
273 | } | |
274 | ||
275 | dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", | |
276 | xd->xid, xd->xprefix, xd->xname); | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
282 | { | |
283 | /* must be called under down_write(xattr_sem); | |
284 | * rc < 0 : recoverable error, try again | |
285 | * rc = 0 : success | |
286 | * rc > 0 : Unrecoverable error, this node should be deleted. | |
287 | */ | |
288 | int rc = 0; | |
289 | BUG_ON(xd->xname); | |
290 | if (!xd->node) | |
291 | return EIO; | |
292 | if (unlikely(ref_flags(xd->node) != REF_PRISTINE)) { | |
293 | rc = do_verify_xattr_datum(c, xd); | |
294 | if (rc > 0) { | |
295 | list_del_init(&xd->xindex); | |
296 | delete_xattr_datum_node(c, xd); | |
297 | } | |
298 | } | |
299 | if (!rc) | |
300 | rc = do_load_xattr_datum(c, xd); | |
301 | return rc; | |
302 | } | |
303 | ||
304 | static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, uint32_t phys_ofs) | |
305 | { | |
306 | /* must be called under down_write(xattr_sem) */ | |
307 | struct jffs2_raw_xattr rx; | |
308 | struct jffs2_raw_node_ref *raw; | |
309 | struct kvec vecs[2]; | |
310 | uint32_t length; | |
311 | int rc, totlen; | |
312 | ||
313 | BUG_ON(!xd->xname); | |
314 | ||
315 | vecs[0].iov_base = ℞ | |
316 | vecs[0].iov_len = PAD(sizeof(rx)); | |
317 | vecs[1].iov_base = xd->xname; | |
318 | vecs[1].iov_len = xd->name_len + 1 + xd->value_len; | |
319 | totlen = vecs[0].iov_len + vecs[1].iov_len; | |
320 | ||
321 | raw = jffs2_alloc_raw_node_ref(); | |
322 | if (!raw) | |
323 | return -ENOMEM; | |
324 | raw->flash_offset = phys_ofs; | |
325 | raw->__totlen = PAD(totlen); | |
326 | raw->next_phys = NULL; | |
327 | raw->next_in_ino = (void *)xd; | |
328 | ||
329 | /* Setup raw-xattr */ | |
330 | rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
331 | rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); | |
332 | rx.totlen = cpu_to_je32(PAD(totlen)); | |
333 | rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); | |
334 | ||
335 | rx.xid = cpu_to_je32(xd->xid); | |
336 | rx.version = cpu_to_je32(++xd->version); | |
337 | rx.xprefix = xd->xprefix; | |
338 | rx.name_len = xd->name_len; | |
339 | rx.value_len = cpu_to_je16(xd->value_len); | |
340 | rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); | |
341 | rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); | |
342 | ||
343 | rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); | |
344 | if (rc || totlen != length) { | |
345 | JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%u, at %#08x\n", | |
346 | rc, totlen, length, phys_ofs); | |
347 | rc = rc ? rc : -EIO; | |
348 | if (length) { | |
349 | raw->flash_offset |= REF_OBSOLETE; | |
350 | raw->next_in_ino = NULL; | |
351 | jffs2_add_physical_node_ref(c, raw); | |
352 | jffs2_mark_node_obsolete(c, raw); | |
353 | } else { | |
354 | jffs2_free_raw_node_ref(raw); | |
355 | } | |
356 | return rc; | |
357 | } | |
358 | BUG_ON(raw->__totlen < sizeof(struct jffs2_raw_xattr)); | |
359 | /* success */ | |
360 | raw->flash_offset |= REF_PRISTINE; | |
361 | jffs2_add_physical_node_ref(c, raw); | |
362 | if (xd->node) | |
363 | delete_xattr_datum_node(c, xd); | |
364 | xd->node = raw; | |
365 | ||
366 | dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", | |
367 | xd->xid, xd->version, xd->xprefix, xd->xname); | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, | |
373 | int xprefix, const char *xname, | |
374 | const char *xvalue, int xsize, | |
375 | uint32_t phys_ofs) | |
376 | { | |
377 | /* must be called under down_write(xattr_sem) */ | |
378 | struct jffs2_xattr_datum *xd; | |
379 | uint32_t hashkey, name_len; | |
380 | char *data; | |
381 | int i, rc; | |
382 | ||
383 | /* Search xattr_datum has same xname/xvalue by index */ | |
384 | hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); | |
385 | i = hashkey % XATTRINDEX_HASHSIZE; | |
386 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { | |
387 | if (xd->hashkey==hashkey | |
388 | && xd->xprefix==xprefix | |
389 | && xd->value_len==xsize | |
390 | && !strcmp(xd->xname, xname) | |
391 | && !memcmp(xd->xvalue, xvalue, xsize)) { | |
392 | xd->refcnt++; | |
393 | return xd; | |
394 | } | |
395 | } | |
396 | ||
397 | /* Not found, Create NEW XATTR-Cache */ | |
398 | name_len = strlen(xname); | |
399 | ||
400 | xd = jffs2_alloc_xattr_datum(); | |
401 | if (!xd) | |
402 | return ERR_PTR(-ENOMEM); | |
403 | ||
404 | data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); | |
405 | if (!data) { | |
406 | jffs2_free_xattr_datum(xd); | |
407 | return ERR_PTR(-ENOMEM); | |
408 | } | |
409 | strcpy(data, xname); | |
410 | memcpy(data + name_len + 1, xvalue, xsize); | |
411 | ||
412 | xd->refcnt = 1; | |
413 | xd->xid = ++c->highest_xid; | |
414 | xd->flags |= JFFS2_XFLAGS_HOT; | |
415 | xd->xprefix = xprefix; | |
416 | ||
417 | xd->hashkey = hashkey; | |
418 | xd->xname = data; | |
419 | xd->xvalue = data + name_len + 1; | |
420 | xd->name_len = name_len; | |
421 | xd->value_len = xsize; | |
422 | xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); | |
423 | ||
424 | rc = save_xattr_datum(c, xd, phys_ofs); | |
425 | if (rc) { | |
426 | kfree(xd->xname); | |
427 | jffs2_free_xattr_datum(xd); | |
428 | return ERR_PTR(rc); | |
429 | } | |
430 | ||
431 | /* Insert Hash Index */ | |
432 | i = hashkey % XATTRINDEX_HASHSIZE; | |
433 | list_add(&xd->xindex, &c->xattrindex[i]); | |
434 | ||
435 | c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); | |
436 | reclaim_xattr_datum(c); | |
437 | ||
438 | return xd; | |
439 | } | |
440 | ||
441 | /* -------- xdatum related functions ---------------- | |
442 | * verify_xattr_ref(c, ref) | |
443 | * is used to load xref information from medium. Because summary data does not | |
444 | * contain xid/ino, it's necessary to verify once while mounting process. | |
445 | * delete_xattr_ref_node(c, ref) | |
446 | * is used to delete a jffs2 node is dominated by xref. When EBS is enabled, | |
447 | * it overwrites the obsolete node by myself. | |
448 | * delete_xattr_ref(c, ref) | |
449 | * is used to delete jffs2_xattr_ref object. If the reference counter of xdatum | |
450 | * is refered by this xref become 0, delete_xattr_datum() is called later. | |
451 | * save_xattr_ref(c, ref, phys_ofs) | |
452 | * is used to write xref to medium. | |
453 | * create_xattr_ref(c, ic, xd, phys_ofs) | |
454 | * is used to create a new xref and write to medium. | |
455 | * jffs2_xattr_delete_inode(c, ic) | |
456 | * is called to remove xrefs related to obsolete inode when inode is unlinked. | |
457 | * jffs2_xattr_free_inode(c, ic) | |
458 | * is called to release xattr related objects when unmounting. | |
8f2b6f49 | 459 | * check_xattr_ref_inode(c, ic) |
aa98d7cf KK |
460 | * is used to confirm inode does not have duplicate xattr name/value pair. |
461 | * -------------------------------------------------- */ | |
462 | static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
463 | { | |
464 | struct jffs2_eraseblock *jeb; | |
465 | struct jffs2_raw_xref rr; | |
466 | size_t readlen; | |
467 | uint32_t crc, totlen; | |
468 | int rc; | |
469 | ||
470 | BUG_ON(ref_flags(ref->node) != REF_UNCHECKED); | |
471 | ||
472 | rc = jffs2_flash_read(c, ref_offset(ref->node), sizeof(rr), &readlen, (char *)&rr); | |
473 | if (rc || sizeof(rr) != readlen) { | |
474 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%u, read=%u, at %#08x\n", | |
475 | rc, sizeof(rr), readlen, ref_offset(ref->node)); | |
476 | return rc ? rc : -EIO; | |
477 | } | |
478 | /* obsolete node */ | |
479 | crc = crc32(0, &rr, sizeof(rr) - 4); | |
480 | if (crc != je32_to_cpu(rr.node_crc)) { | |
481 | if (je32_to_cpu(rr.node_crc) != 0xffffffff) | |
482 | JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", | |
483 | ref_offset(ref->node), je32_to_cpu(rr.node_crc), crc); | |
484 | return EIO; | |
485 | } | |
486 | if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK | |
487 | || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF | |
488 | || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { | |
489 | JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " | |
490 | "nodetype=%#04x/%#04x, totlen=%u/%u\n", | |
491 | ref_offset(ref->node), je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, | |
492 | je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, | |
493 | je32_to_cpu(rr.totlen), PAD(sizeof(rr))); | |
494 | return EIO; | |
495 | } | |
496 | ref->ino = je32_to_cpu(rr.ino); | |
497 | ref->xid = je32_to_cpu(rr.xid); | |
498 | ||
499 | /* fixup superblock/eraseblock info */ | |
500 | jeb = &c->blocks[ref_offset(ref->node) / c->sector_size]; | |
501 | totlen = PAD(sizeof(rr)); | |
502 | ||
503 | spin_lock(&c->erase_completion_lock); | |
504 | c->unchecked_size -= totlen; c->used_size += totlen; | |
505 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
506 | ref->node->flash_offset = ref_offset(ref->node) | REF_PRISTINE; | |
507 | spin_unlock(&c->erase_completion_lock); | |
508 | ||
509 | dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", | |
510 | ref->ino, ref->xid, ref_offset(ref->node)); | |
511 | return 0; | |
512 | } | |
513 | ||
514 | static void delete_xattr_ref_node(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
515 | { | |
516 | struct jffs2_raw_xref rr; | |
517 | uint32_t length; | |
518 | int rc; | |
519 | ||
520 | if (jffs2_sum_active()) { | |
521 | memset(&rr, 0xff, sizeof(rr)); | |
522 | rc = jffs2_flash_read(c, ref_offset(ref->node), | |
523 | sizeof(struct jffs2_unknown_node), | |
524 | &length, (char *)&rr); | |
525 | if (rc || length != sizeof(struct jffs2_unknown_node)) { | |
526 | JFFS2_ERROR("jffs2_flash_read()=%d, req=%u, read=%u at %#08x\n", | |
527 | rc, sizeof(struct jffs2_unknown_node), | |
528 | length, ref_offset(ref->node)); | |
529 | } | |
530 | rc = jffs2_flash_write(c, ref_offset(ref->node), sizeof(rr), | |
531 | &length, (char *)&rr); | |
532 | if (rc || length != sizeof(struct jffs2_raw_xref)) { | |
533 | JFFS2_ERROR("jffs2_flash_write()=%d, req=%u, wrote=%u at %#08x\n", | |
534 | rc, sizeof(rr), length, ref_offset(ref->node)); | |
535 | } | |
536 | } | |
537 | spin_lock(&c->erase_completion_lock); | |
538 | ref->node->next_in_ino = NULL; | |
539 | spin_unlock(&c->erase_completion_lock); | |
540 | jffs2_mark_node_obsolete(c, ref->node); | |
541 | ref->node = NULL; | |
542 | } | |
543 | ||
544 | static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
545 | { | |
546 | /* must be called under down_write(xattr_sem) */ | |
547 | struct jffs2_xattr_datum *xd; | |
548 | ||
549 | BUG_ON(!ref->node); | |
550 | delete_xattr_ref_node(c, ref); | |
551 | ||
aa98d7cf KK |
552 | xd = ref->xd; |
553 | xd->refcnt--; | |
554 | if (!xd->refcnt) | |
555 | delete_xattr_datum(c, xd); | |
556 | jffs2_free_xattr_ref(ref); | |
557 | } | |
558 | ||
559 | static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, uint32_t phys_ofs) | |
560 | { | |
561 | /* must be called under down_write(xattr_sem) */ | |
562 | struct jffs2_raw_node_ref *raw; | |
563 | struct jffs2_raw_xref rr; | |
564 | uint32_t length; | |
565 | int ret; | |
566 | ||
567 | raw = jffs2_alloc_raw_node_ref(); | |
568 | if (!raw) | |
569 | return -ENOMEM; | |
570 | raw->flash_offset = phys_ofs; | |
571 | raw->__totlen = PAD(sizeof(rr)); | |
572 | raw->next_phys = NULL; | |
573 | raw->next_in_ino = (void *)ref; | |
574 | ||
575 | rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
576 | rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); | |
577 | rr.totlen = cpu_to_je32(PAD(sizeof(rr))); | |
578 | rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); | |
579 | ||
580 | rr.ino = cpu_to_je32(ref->ic->ino); | |
581 | rr.xid = cpu_to_je32(ref->xd->xid); | |
582 | rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); | |
583 | ||
584 | ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); | |
585 | if (ret || sizeof(rr) != length) { | |
586 | JFFS2_WARNING("jffs2_flash_write() returned %d, request=%u, retlen=%u, at %#08x\n", | |
587 | ret, sizeof(rr), length, phys_ofs); | |
588 | ret = ret ? ret : -EIO; | |
589 | if (length) { | |
590 | raw->flash_offset |= REF_OBSOLETE; | |
591 | raw->next_in_ino = NULL; | |
592 | jffs2_add_physical_node_ref(c, raw); | |
593 | jffs2_mark_node_obsolete(c, raw); | |
594 | } else { | |
595 | jffs2_free_raw_node_ref(raw); | |
596 | } | |
597 | return ret; | |
598 | } | |
599 | raw->flash_offset |= REF_PRISTINE; | |
600 | ||
601 | jffs2_add_physical_node_ref(c, raw); | |
602 | if (ref->node) | |
603 | delete_xattr_ref_node(c, ref); | |
604 | ref->node = raw; | |
605 | ||
606 | dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
611 | static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, | |
612 | struct jffs2_xattr_datum *xd, uint32_t phys_ofs) | |
613 | { | |
614 | /* must be called under down_write(xattr_sem) */ | |
615 | struct jffs2_xattr_ref *ref; | |
616 | int ret; | |
617 | ||
618 | ref = jffs2_alloc_xattr_ref(); | |
619 | if (!ref) | |
620 | return ERR_PTR(-ENOMEM); | |
621 | ref->ic = ic; | |
622 | ref->xd = xd; | |
623 | ||
624 | ret = save_xattr_ref(c, ref, phys_ofs); | |
625 | if (ret) { | |
626 | jffs2_free_xattr_ref(ref); | |
627 | return ERR_PTR(ret); | |
628 | } | |
629 | ||
630 | /* Chain to inode */ | |
8f2b6f49 KK |
631 | ref->next = ic->xref; |
632 | ic->xref = ref; | |
aa98d7cf KK |
633 | |
634 | return ref; /* success */ | |
635 | } | |
636 | ||
637 | void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) | |
638 | { | |
639 | /* It's called from jffs2_clear_inode() on inode removing. | |
640 | When an inode with XATTR is removed, those XATTRs must be removed. */ | |
641 | struct jffs2_xattr_ref *ref, *_ref; | |
642 | ||
643 | if (!ic || ic->nlink > 0) | |
644 | return; | |
645 | ||
646 | down_write(&c->xattr_sem); | |
8f2b6f49 KK |
647 | for (ref = ic->xref; ref; ref = _ref) { |
648 | _ref = ref->next; | |
aa98d7cf | 649 | delete_xattr_ref(c, ref); |
8f2b6f49 KK |
650 | } |
651 | ic->xref = NULL; | |
aa98d7cf KK |
652 | up_write(&c->xattr_sem); |
653 | } | |
654 | ||
655 | void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) | |
656 | { | |
657 | /* It's called from jffs2_free_ino_caches() until unmounting FS. */ | |
658 | struct jffs2_xattr_datum *xd; | |
659 | struct jffs2_xattr_ref *ref, *_ref; | |
660 | ||
661 | down_write(&c->xattr_sem); | |
8f2b6f49 KK |
662 | for (ref = ic->xref; ref; ref = _ref) { |
663 | _ref = ref->next; | |
aa98d7cf KK |
664 | xd = ref->xd; |
665 | xd->refcnt--; | |
666 | if (!xd->refcnt) { | |
667 | unload_xattr_datum(c, xd); | |
668 | jffs2_free_xattr_datum(xd); | |
669 | } | |
670 | jffs2_free_xattr_ref(ref); | |
671 | } | |
8f2b6f49 | 672 | ic->xref = NULL; |
aa98d7cf KK |
673 | up_write(&c->xattr_sem); |
674 | } | |
675 | ||
8f2b6f49 | 676 | static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
aa98d7cf | 677 | { |
8f2b6f49 | 678 | /* success of check_xattr_ref_inode() means taht inode (ic) dose not have |
aa98d7cf KK |
679 | * duplicate name/value pairs. If duplicate name/value pair would be found, |
680 | * one will be removed. | |
681 | */ | |
8f2b6f49 | 682 | struct jffs2_xattr_ref *ref, *cmp, **pref; |
aa98d7cf KK |
683 | int rc = 0; |
684 | ||
685 | if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) | |
686 | return 0; | |
687 | down_write(&c->xattr_sem); | |
688 | retry: | |
689 | rc = 0; | |
8f2b6f49 | 690 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
691 | if (!ref->xd->xname) { |
692 | rc = load_xattr_datum(c, ref->xd); | |
693 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 694 | *pref = ref->next; |
aa98d7cf KK |
695 | delete_xattr_ref(c, ref); |
696 | goto retry; | |
697 | } else if (unlikely(rc < 0)) | |
698 | goto out; | |
699 | } | |
8f2b6f49 | 700 | for (cmp=ref->next, pref=&ref->next; cmp; pref=&cmp->next, cmp=cmp->next) { |
aa98d7cf KK |
701 | if (!cmp->xd->xname) { |
702 | ref->xd->flags |= JFFS2_XFLAGS_BIND; | |
703 | rc = load_xattr_datum(c, cmp->xd); | |
704 | ref->xd->flags &= ~JFFS2_XFLAGS_BIND; | |
705 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 706 | *pref = cmp->next; |
aa98d7cf KK |
707 | delete_xattr_ref(c, cmp); |
708 | goto retry; | |
709 | } else if (unlikely(rc < 0)) | |
710 | goto out; | |
711 | } | |
712 | if (ref->xd->xprefix == cmp->xd->xprefix | |
713 | && !strcmp(ref->xd->xname, cmp->xd->xname)) { | |
8f2b6f49 | 714 | *pref = cmp->next; |
aa98d7cf KK |
715 | delete_xattr_ref(c, cmp); |
716 | goto retry; | |
717 | } | |
718 | } | |
719 | } | |
720 | ic->flags |= INO_FLAGS_XATTR_CHECKED; | |
721 | out: | |
722 | up_write(&c->xattr_sem); | |
723 | ||
724 | return rc; | |
725 | } | |
726 | ||
727 | /* -------- xattr subsystem functions --------------- | |
728 | * jffs2_init_xattr_subsystem(c) | |
729 | * is used to initialize semaphore and list_head, and some variables. | |
730 | * jffs2_find_xattr_datum(c, xid) | |
731 | * is used to lookup xdatum while scanning process. | |
732 | * jffs2_clear_xattr_subsystem(c) | |
733 | * is used to release any xattr related objects. | |
734 | * jffs2_build_xattr_subsystem(c) | |
735 | * is used to associate xdatum and xref while super block building process. | |
736 | * jffs2_setup_xattr_datum(c, xid, version) | |
737 | * is used to insert xdatum while scanning process. | |
738 | * -------------------------------------------------- */ | |
739 | void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) | |
740 | { | |
741 | int i; | |
742 | ||
743 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) | |
744 | INIT_LIST_HEAD(&c->xattrindex[i]); | |
aa98d7cf | 745 | INIT_LIST_HEAD(&c->xattr_unchecked); |
8f2b6f49 | 746 | c->xref_temp = NULL; |
aa98d7cf KK |
747 | |
748 | init_rwsem(&c->xattr_sem); | |
749 | c->xdatum_mem_usage = 0; | |
750 | c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ | |
751 | } | |
752 | ||
753 | static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) | |
754 | { | |
755 | struct jffs2_xattr_datum *xd; | |
756 | int i = xid % XATTRINDEX_HASHSIZE; | |
757 | ||
758 | /* It's only used in scanning/building process. */ | |
759 | BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); | |
760 | ||
761 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { | |
762 | if (xd->xid==xid) | |
763 | return xd; | |
764 | } | |
765 | return NULL; | |
766 | } | |
767 | ||
768 | void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) | |
769 | { | |
770 | struct jffs2_xattr_datum *xd, *_xd; | |
771 | struct jffs2_xattr_ref *ref, *_ref; | |
772 | int i; | |
773 | ||
8f2b6f49 KK |
774 | for (ref=c->xref_temp; ref; ref = _ref) { |
775 | _ref = ref->next; | |
aa98d7cf | 776 | jffs2_free_xattr_ref(ref); |
8f2b6f49 KK |
777 | } |
778 | c->xref_temp = NULL; | |
aa98d7cf KK |
779 | |
780 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { | |
781 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { | |
782 | list_del(&xd->xindex); | |
783 | if (xd->xname) | |
784 | kfree(xd->xname); | |
785 | jffs2_free_xattr_datum(xd); | |
786 | } | |
787 | } | |
788 | } | |
789 | ||
790 | void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) | |
791 | { | |
792 | struct jffs2_xattr_ref *ref, *_ref; | |
793 | struct jffs2_xattr_datum *xd, *_xd; | |
794 | struct jffs2_inode_cache *ic; | |
795 | int i, xdatum_count =0, xdatum_unchecked_count = 0, xref_count = 0; | |
796 | ||
797 | BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); | |
798 | ||
799 | /* Phase.1 */ | |
8f2b6f49 KK |
800 | for (ref=c->xref_temp; ref; ref=_ref) { |
801 | _ref = ref->next; | |
aa98d7cf KK |
802 | /* checking REF_UNCHECKED nodes */ |
803 | if (ref_flags(ref->node) != REF_PRISTINE) { | |
804 | if (verify_xattr_ref(c, ref)) { | |
805 | delete_xattr_ref_node(c, ref); | |
806 | jffs2_free_xattr_ref(ref); | |
807 | continue; | |
808 | } | |
809 | } | |
810 | /* At this point, ref->xid and ref->ino contain XID and inode number. | |
811 | ref->xd and ref->ic are not valid yet. */ | |
812 | xd = jffs2_find_xattr_datum(c, ref->xid); | |
813 | ic = jffs2_get_ino_cache(c, ref->ino); | |
814 | if (!xd || !ic) { | |
815 | if (ref_flags(ref->node) != REF_UNCHECKED) | |
816 | JFFS2_WARNING("xref(ino=%u, xid=%u) is orphan. \n", | |
817 | ref->ino, ref->xid); | |
818 | delete_xattr_ref_node(c, ref); | |
819 | jffs2_free_xattr_ref(ref); | |
820 | continue; | |
821 | } | |
822 | ref->xd = xd; | |
823 | ref->ic = ic; | |
824 | xd->refcnt++; | |
8f2b6f49 KK |
825 | ref->next = ic->xref; |
826 | ic->xref = ref; | |
aa98d7cf KK |
827 | xref_count++; |
828 | } | |
8f2b6f49 | 829 | c->xref_temp = NULL; |
aa98d7cf KK |
830 | /* After this, ref->xid/ino are NEVER used. */ |
831 | ||
832 | /* Phase.2 */ | |
833 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { | |
834 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { | |
835 | list_del_init(&xd->xindex); | |
836 | if (!xd->refcnt) { | |
837 | if (ref_flags(xd->node) != REF_UNCHECKED) | |
838 | JFFS2_WARNING("orphan xdatum(xid=%u, version=%u) at %#08x\n", | |
839 | xd->xid, xd->version, ref_offset(xd->node)); | |
840 | delete_xattr_datum(c, xd); | |
841 | continue; | |
842 | } | |
843 | if (ref_flags(xd->node) != REF_PRISTINE) { | |
844 | dbg_xattr("unchecked xdatum(xid=%u) at %#08x\n", | |
845 | xd->xid, ref_offset(xd->node)); | |
846 | list_add(&xd->xindex, &c->xattr_unchecked); | |
847 | xdatum_unchecked_count++; | |
848 | } | |
849 | xdatum_count++; | |
850 | } | |
851 | } | |
852 | /* build complete */ | |
853 | JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum (%u unchecked) and " | |
854 | "%u of xref found.\n", xdatum_count, xdatum_unchecked_count, xref_count); | |
855 | } | |
856 | ||
857 | struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, | |
858 | uint32_t xid, uint32_t version) | |
859 | { | |
860 | struct jffs2_xattr_datum *xd, *_xd; | |
861 | ||
862 | _xd = jffs2_find_xattr_datum(c, xid); | |
863 | if (_xd) { | |
864 | dbg_xattr("duplicate xdatum (xid=%u, version=%u/%u) at %#08x\n", | |
865 | xid, version, _xd->version, ref_offset(_xd->node)); | |
866 | if (version < _xd->version) | |
867 | return ERR_PTR(-EEXIST); | |
868 | } | |
869 | xd = jffs2_alloc_xattr_datum(); | |
870 | if (!xd) | |
871 | return ERR_PTR(-ENOMEM); | |
872 | xd->xid = xid; | |
873 | xd->version = version; | |
874 | if (xd->xid > c->highest_xid) | |
875 | c->highest_xid = xd->xid; | |
876 | list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); | |
877 | ||
878 | if (_xd) { | |
879 | list_del_init(&_xd->xindex); | |
880 | delete_xattr_datum_node(c, _xd); | |
881 | jffs2_free_xattr_datum(_xd); | |
882 | } | |
883 | return xd; | |
884 | } | |
885 | ||
886 | /* -------- xattr subsystem functions --------------- | |
887 | * xprefix_to_handler(xprefix) | |
888 | * is used to translate xprefix into xattr_handler. | |
889 | * jffs2_listxattr(dentry, buffer, size) | |
890 | * is an implementation of listxattr handler on jffs2. | |
891 | * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) | |
892 | * is an implementation of getxattr handler on jffs2. | |
893 | * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) | |
894 | * is an implementation of setxattr handler on jffs2. | |
895 | * -------------------------------------------------- */ | |
896 | struct xattr_handler *jffs2_xattr_handlers[] = { | |
897 | &jffs2_user_xattr_handler, | |
898 | #ifdef CONFIG_JFFS2_FS_SECURITY | |
899 | &jffs2_security_xattr_handler, | |
900 | #endif | |
901 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
902 | &jffs2_acl_access_xattr_handler, | |
903 | &jffs2_acl_default_xattr_handler, | |
904 | #endif | |
905 | &jffs2_trusted_xattr_handler, | |
906 | NULL | |
907 | }; | |
908 | ||
909 | static struct xattr_handler *xprefix_to_handler(int xprefix) { | |
910 | struct xattr_handler *ret; | |
911 | ||
912 | switch (xprefix) { | |
913 | case JFFS2_XPREFIX_USER: | |
914 | ret = &jffs2_user_xattr_handler; | |
915 | break; | |
916 | #ifdef CONFIG_JFFS2_FS_SECURITY | |
917 | case JFFS2_XPREFIX_SECURITY: | |
918 | ret = &jffs2_security_xattr_handler; | |
919 | break; | |
920 | #endif | |
921 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
922 | case JFFS2_XPREFIX_ACL_ACCESS: | |
923 | ret = &jffs2_acl_access_xattr_handler; | |
924 | break; | |
925 | case JFFS2_XPREFIX_ACL_DEFAULT: | |
926 | ret = &jffs2_acl_default_xattr_handler; | |
927 | break; | |
928 | #endif | |
929 | case JFFS2_XPREFIX_TRUSTED: | |
930 | ret = &jffs2_trusted_xattr_handler; | |
931 | break; | |
932 | default: | |
933 | ret = NULL; | |
934 | break; | |
935 | } | |
936 | return ret; | |
937 | } | |
938 | ||
939 | ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) | |
940 | { | |
941 | struct inode *inode = dentry->d_inode; | |
942 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
943 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
944 | struct jffs2_inode_cache *ic = f->inocache; | |
8f2b6f49 | 945 | struct jffs2_xattr_ref *ref, **pref; |
aa98d7cf KK |
946 | struct jffs2_xattr_datum *xd; |
947 | struct xattr_handler *xhandle; | |
948 | ssize_t len, rc; | |
949 | int retry = 0; | |
950 | ||
8f2b6f49 | 951 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
952 | if (unlikely(rc)) |
953 | return rc; | |
954 | ||
955 | down_read(&c->xattr_sem); | |
956 | retry: | |
957 | len = 0; | |
8f2b6f49 | 958 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
959 | BUG_ON(ref->ic != ic); |
960 | xd = ref->xd; | |
961 | if (!xd->xname) { | |
962 | /* xdatum is unchached */ | |
963 | if (!retry) { | |
964 | retry = 1; | |
965 | up_read(&c->xattr_sem); | |
966 | down_write(&c->xattr_sem); | |
967 | goto retry; | |
968 | } else { | |
969 | rc = load_xattr_datum(c, xd); | |
970 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 971 | *pref = ref->next; |
aa98d7cf KK |
972 | delete_xattr_ref(c, ref); |
973 | goto retry; | |
974 | } else if (unlikely(rc < 0)) | |
975 | goto out; | |
976 | } | |
977 | } | |
978 | xhandle = xprefix_to_handler(xd->xprefix); | |
979 | if (!xhandle) | |
980 | continue; | |
981 | if (buffer) { | |
982 | rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len); | |
983 | } else { | |
984 | rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len); | |
985 | } | |
986 | if (rc < 0) | |
987 | goto out; | |
988 | len += rc; | |
989 | } | |
990 | rc = len; | |
991 | out: | |
992 | if (!retry) { | |
993 | up_read(&c->xattr_sem); | |
994 | } else { | |
995 | up_write(&c->xattr_sem); | |
996 | } | |
997 | return rc; | |
998 | } | |
999 | ||
1000 | int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, | |
1001 | char *buffer, size_t size) | |
1002 | { | |
1003 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1004 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
1005 | struct jffs2_inode_cache *ic = f->inocache; | |
1006 | struct jffs2_xattr_datum *xd; | |
8f2b6f49 | 1007 | struct jffs2_xattr_ref *ref, **pref; |
aa98d7cf KK |
1008 | int rc, retry = 0; |
1009 | ||
8f2b6f49 | 1010 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
1011 | if (unlikely(rc)) |
1012 | return rc; | |
1013 | ||
1014 | down_read(&c->xattr_sem); | |
1015 | retry: | |
8f2b6f49 | 1016 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
1017 | BUG_ON(ref->ic!=ic); |
1018 | ||
1019 | xd = ref->xd; | |
1020 | if (xd->xprefix != xprefix) | |
1021 | continue; | |
1022 | if (!xd->xname) { | |
1023 | /* xdatum is unchached */ | |
1024 | if (!retry) { | |
1025 | retry = 1; | |
1026 | up_read(&c->xattr_sem); | |
1027 | down_write(&c->xattr_sem); | |
1028 | goto retry; | |
1029 | } else { | |
1030 | rc = load_xattr_datum(c, xd); | |
1031 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 1032 | *pref = ref->next; |
aa98d7cf KK |
1033 | delete_xattr_ref(c, ref); |
1034 | goto retry; | |
1035 | } else if (unlikely(rc < 0)) { | |
1036 | goto out; | |
1037 | } | |
1038 | } | |
1039 | } | |
1040 | if (!strcmp(xname, xd->xname)) { | |
1041 | rc = xd->value_len; | |
1042 | if (buffer) { | |
1043 | if (size < rc) { | |
1044 | rc = -ERANGE; | |
1045 | } else { | |
1046 | memcpy(buffer, xd->xvalue, rc); | |
1047 | } | |
1048 | } | |
1049 | goto out; | |
1050 | } | |
1051 | } | |
1052 | rc = -ENODATA; | |
1053 | out: | |
1054 | if (!retry) { | |
1055 | up_read(&c->xattr_sem); | |
1056 | } else { | |
1057 | up_write(&c->xattr_sem); | |
1058 | } | |
1059 | return rc; | |
1060 | } | |
1061 | ||
1062 | int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, | |
1063 | const char *buffer, size_t size, int flags) | |
1064 | { | |
1065 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1066 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
1067 | struct jffs2_inode_cache *ic = f->inocache; | |
1068 | struct jffs2_xattr_datum *xd; | |
8f2b6f49 | 1069 | struct jffs2_xattr_ref *ref, *newref, **pref; |
aa98d7cf KK |
1070 | uint32_t phys_ofs, length, request; |
1071 | int rc; | |
1072 | ||
8f2b6f49 | 1073 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
1074 | if (unlikely(rc)) |
1075 | return rc; | |
1076 | ||
1077 | request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); | |
1078 | rc = jffs2_reserve_space(c, request, &phys_ofs, &length, | |
1079 | ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); | |
1080 | if (rc) { | |
1081 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); | |
1082 | return rc; | |
1083 | } | |
1084 | ||
1085 | /* Find existing xattr */ | |
1086 | down_write(&c->xattr_sem); | |
1087 | retry: | |
8f2b6f49 | 1088 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
1089 | xd = ref->xd; |
1090 | if (xd->xprefix != xprefix) | |
1091 | continue; | |
1092 | if (!xd->xname) { | |
1093 | rc = load_xattr_datum(c, xd); | |
1094 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 1095 | *pref = ref->next; |
aa98d7cf KK |
1096 | delete_xattr_ref(c, ref); |
1097 | goto retry; | |
1098 | } else if (unlikely(rc < 0)) | |
1099 | goto out; | |
1100 | } | |
1101 | if (!strcmp(xd->xname, xname)) { | |
1102 | if (flags & XATTR_CREATE) { | |
1103 | rc = -EEXIST; | |
1104 | goto out; | |
1105 | } | |
1106 | if (!buffer) { | |
8f2b6f49 | 1107 | *pref = ref->next; |
aa98d7cf KK |
1108 | delete_xattr_ref(c, ref); |
1109 | rc = 0; | |
1110 | goto out; | |
1111 | } | |
1112 | goto found; | |
1113 | } | |
1114 | } | |
1115 | /* not found */ | |
aa98d7cf KK |
1116 | if (flags & XATTR_REPLACE) { |
1117 | rc = -ENODATA; | |
1118 | goto out; | |
1119 | } | |
1120 | if (!buffer) { | |
1121 | rc = -EINVAL; | |
1122 | goto out; | |
1123 | } | |
1124 | found: | |
1125 | xd = create_xattr_datum(c, xprefix, xname, buffer, size, phys_ofs); | |
1126 | if (IS_ERR(xd)) { | |
1127 | rc = PTR_ERR(xd); | |
1128 | goto out; | |
1129 | } | |
1130 | up_write(&c->xattr_sem); | |
1131 | jffs2_complete_reservation(c); | |
1132 | ||
1133 | /* create xattr_ref */ | |
1134 | request = PAD(sizeof(struct jffs2_raw_xref)); | |
1135 | rc = jffs2_reserve_space(c, request, &phys_ofs, &length, | |
1136 | ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); | |
1137 | if (rc) { | |
1138 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); | |
1139 | down_write(&c->xattr_sem); | |
1140 | xd->refcnt--; | |
1141 | if (!xd->refcnt) | |
1142 | delete_xattr_datum(c, xd); | |
1143 | up_write(&c->xattr_sem); | |
1144 | return rc; | |
1145 | } | |
1146 | down_write(&c->xattr_sem); | |
8f2b6f49 KK |
1147 | if (ref) |
1148 | *pref = ref->next; | |
aa98d7cf KK |
1149 | newref = create_xattr_ref(c, ic, xd, phys_ofs); |
1150 | if (IS_ERR(newref)) { | |
8f2b6f49 KK |
1151 | if (ref) { |
1152 | ref->next = ic->xref; | |
1153 | ic->xref = ref; | |
1154 | } | |
aa98d7cf KK |
1155 | rc = PTR_ERR(newref); |
1156 | xd->refcnt--; | |
1157 | if (!xd->refcnt) | |
1158 | delete_xattr_datum(c, xd); | |
1159 | } else if (ref) { | |
aa98d7cf KK |
1160 | delete_xattr_ref(c, ref); |
1161 | } | |
1162 | out: | |
1163 | up_write(&c->xattr_sem); | |
1164 | jffs2_complete_reservation(c); | |
1165 | return rc; | |
1166 | } | |
1167 | ||
1168 | /* -------- garbage collector functions ------------- | |
1169 | * jffs2_garbage_collect_xattr_datum(c, xd) | |
1170 | * is used to move xdatum into new node. | |
1171 | * jffs2_garbage_collect_xattr_ref(c, ref) | |
1172 | * is used to move xref into new node. | |
aa98d7cf KK |
1173 | * jffs2_verify_xattr(c) |
1174 | * is used to call do_verify_xattr_datum() before garbage collecting. | |
1175 | * -------------------------------------------------- */ | |
084702e0 | 1176 | int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
aa98d7cf | 1177 | { |
aa98d7cf | 1178 | uint32_t phys_ofs, totlen, length, old_ofs; |
084702e0 | 1179 | int rc = -EINVAL; |
aa98d7cf | 1180 | |
084702e0 | 1181 | down_write(&c->xattr_sem); |
aa98d7cf KK |
1182 | BUG_ON(!xd->node); |
1183 | ||
1184 | old_ofs = ref_offset(xd->node); | |
1185 | totlen = ref_totlen(c, c->gcblock, xd->node); | |
1186 | if (totlen < sizeof(struct jffs2_raw_xattr)) | |
084702e0 | 1187 | goto out; |
aa98d7cf KK |
1188 | |
1189 | if (!xd->xname) { | |
1190 | rc = load_xattr_datum(c, xd); | |
1191 | if (unlikely(rc > 0)) { | |
1192 | delete_xattr_datum_node(c, xd); | |
084702e0 KK |
1193 | rc = 0; |
1194 | goto out; | |
aa98d7cf | 1195 | } else if (unlikely(rc < 0)) |
084702e0 | 1196 | goto out; |
aa98d7cf KK |
1197 | } |
1198 | rc = jffs2_reserve_space_gc(c, totlen, &phys_ofs, &length, JFFS2_SUMMARY_XATTR_SIZE); | |
1199 | if (rc || length < totlen) { | |
1200 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, totlen); | |
084702e0 KK |
1201 | rc = rc ? rc : -EBADFD; |
1202 | goto out; | |
aa98d7cf KK |
1203 | } |
1204 | rc = save_xattr_datum(c, xd, phys_ofs); | |
1205 | if (!rc) | |
1206 | dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", | |
1207 | xd->xid, xd->version, old_ofs, ref_offset(xd->node)); | |
084702e0 KK |
1208 | out: |
1209 | up_write(&c->xattr_sem); | |
aa98d7cf KK |
1210 | return rc; |
1211 | } | |
1212 | ||
1213 | ||
084702e0 | 1214 | int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
aa98d7cf | 1215 | { |
aa98d7cf | 1216 | uint32_t phys_ofs, totlen, length, old_ofs; |
084702e0 | 1217 | int rc = -EINVAL; |
aa98d7cf | 1218 | |
084702e0 | 1219 | down_write(&c->xattr_sem); |
aa98d7cf KK |
1220 | BUG_ON(!ref->node); |
1221 | ||
1222 | old_ofs = ref_offset(ref->node); | |
1223 | totlen = ref_totlen(c, c->gcblock, ref->node); | |
1224 | if (totlen != sizeof(struct jffs2_raw_xref)) | |
084702e0 KK |
1225 | goto out; |
1226 | ||
aa98d7cf KK |
1227 | rc = jffs2_reserve_space_gc(c, totlen, &phys_ofs, &length, JFFS2_SUMMARY_XREF_SIZE); |
1228 | if (rc || length < totlen) { | |
1229 | JFFS2_WARNING("%s: jffs2_reserve_space() = %d, request = %u\n", | |
1230 | __FUNCTION__, rc, totlen); | |
084702e0 KK |
1231 | rc = rc ? rc : -EBADFD; |
1232 | goto out; | |
aa98d7cf KK |
1233 | } |
1234 | rc = save_xattr_ref(c, ref, phys_ofs); | |
1235 | if (!rc) | |
1236 | dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", | |
1237 | ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); | |
084702e0 KK |
1238 | out: |
1239 | up_write(&c->xattr_sem); | |
aa98d7cf KK |
1240 | return rc; |
1241 | } | |
1242 | ||
aa98d7cf KK |
1243 | int jffs2_verify_xattr(struct jffs2_sb_info *c) |
1244 | { | |
1245 | struct jffs2_xattr_datum *xd, *_xd; | |
1246 | int rc; | |
1247 | ||
1248 | down_write(&c->xattr_sem); | |
1249 | list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { | |
1250 | rc = do_verify_xattr_datum(c, xd); | |
1251 | if (rc == 0) { | |
1252 | list_del_init(&xd->xindex); | |
1253 | break; | |
1254 | } else if (rc > 0) { | |
1255 | list_del_init(&xd->xindex); | |
1256 | delete_xattr_datum_node(c, xd); | |
1257 | } | |
1258 | } | |
1259 | up_write(&c->xattr_sem); | |
1260 | ||
1261 | return list_empty(&c->xattr_unchecked) ? 1 : 0; | |
1262 | } |