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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(). | |
9fe4854c | 52 | * save_xattr_datum(c, xd) |
aa98d7cf | 53 | * is used to write xdatum to medium. xd->version will be incremented. |
9fe4854c | 54 | * create_xattr_datum(c, xprefix, xname, xvalue, xsize) |
aa98d7cf KK |
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; | |
89291a9d | 114 | size_t length; |
aa98d7cf KK |
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)) { | |
89291a9d | 127 | JFFS2_ERROR("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", |
aa98d7cf KK |
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)) { | |
89291a9d | 134 | JFFS2_ERROR("jffs2_flash_write()=%d, req=%zu, wrote=%zu ar %#08x\n", |
aa98d7cf KK |
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)) { | |
89291a9d | 172 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", |
aa98d7cf KK |
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) { | |
89291a9d | 243 | JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", |
aa98d7cf KK |
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 | ||
9fe4854c | 304 | static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
aa98d7cf KK |
305 | { |
306 | /* must be called under down_write(xattr_sem) */ | |
aa98d7cf | 307 | struct jffs2_raw_node_ref *raw; |
2f785402 | 308 | struct jffs2_raw_xattr rx; |
aa98d7cf | 309 | struct kvec vecs[2]; |
89291a9d | 310 | size_t length; |
aa98d7cf | 311 | int rc, totlen; |
9fe4854c | 312 | uint32_t phys_ofs = write_ofs(c); |
aa98d7cf KK |
313 | |
314 | BUG_ON(!xd->xname); | |
315 | ||
316 | vecs[0].iov_base = ℞ | |
317 | vecs[0].iov_len = PAD(sizeof(rx)); | |
318 | vecs[1].iov_base = xd->xname; | |
319 | vecs[1].iov_len = xd->name_len + 1 + xd->value_len; | |
320 | totlen = vecs[0].iov_len + vecs[1].iov_len; | |
321 | ||
aa98d7cf KK |
322 | /* Setup raw-xattr */ |
323 | rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
324 | rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); | |
325 | rx.totlen = cpu_to_je32(PAD(totlen)); | |
326 | rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); | |
327 | ||
328 | rx.xid = cpu_to_je32(xd->xid); | |
329 | rx.version = cpu_to_je32(++xd->version); | |
330 | rx.xprefix = xd->xprefix; | |
331 | rx.name_len = xd->name_len; | |
332 | rx.value_len = cpu_to_je16(xd->value_len); | |
333 | rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); | |
334 | rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); | |
335 | ||
336 | rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); | |
337 | if (rc || totlen != length) { | |
89291a9d | 338 | JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", |
aa98d7cf KK |
339 | rc, totlen, length, phys_ofs); |
340 | rc = rc ? rc : -EIO; | |
2f785402 DW |
341 | if (length) |
342 | jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); | |
343 | ||
aa98d7cf KK |
344 | return rc; |
345 | } | |
b64335f2 | 346 | |
aa98d7cf | 347 | /* success */ |
2f785402 | 348 | raw = jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), NULL); |
fcb75787 DW |
349 | /* FIXME */ raw->next_in_ino = (void *)xd; |
350 | ||
aa98d7cf KK |
351 | if (xd->node) |
352 | delete_xattr_datum_node(c, xd); | |
353 | xd->node = raw; | |
354 | ||
355 | dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", | |
356 | xd->xid, xd->version, xd->xprefix, xd->xname); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, | |
362 | int xprefix, const char *xname, | |
9fe4854c | 363 | const char *xvalue, int xsize) |
aa98d7cf KK |
364 | { |
365 | /* must be called under down_write(xattr_sem) */ | |
366 | struct jffs2_xattr_datum *xd; | |
367 | uint32_t hashkey, name_len; | |
368 | char *data; | |
369 | int i, rc; | |
370 | ||
371 | /* Search xattr_datum has same xname/xvalue by index */ | |
372 | hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); | |
373 | i = hashkey % XATTRINDEX_HASHSIZE; | |
374 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { | |
375 | if (xd->hashkey==hashkey | |
376 | && xd->xprefix==xprefix | |
377 | && xd->value_len==xsize | |
378 | && !strcmp(xd->xname, xname) | |
379 | && !memcmp(xd->xvalue, xvalue, xsize)) { | |
380 | xd->refcnt++; | |
381 | return xd; | |
382 | } | |
383 | } | |
384 | ||
385 | /* Not found, Create NEW XATTR-Cache */ | |
386 | name_len = strlen(xname); | |
387 | ||
388 | xd = jffs2_alloc_xattr_datum(); | |
389 | if (!xd) | |
390 | return ERR_PTR(-ENOMEM); | |
391 | ||
392 | data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); | |
393 | if (!data) { | |
394 | jffs2_free_xattr_datum(xd); | |
395 | return ERR_PTR(-ENOMEM); | |
396 | } | |
397 | strcpy(data, xname); | |
398 | memcpy(data + name_len + 1, xvalue, xsize); | |
399 | ||
400 | xd->refcnt = 1; | |
401 | xd->xid = ++c->highest_xid; | |
402 | xd->flags |= JFFS2_XFLAGS_HOT; | |
403 | xd->xprefix = xprefix; | |
404 | ||
405 | xd->hashkey = hashkey; | |
406 | xd->xname = data; | |
407 | xd->xvalue = data + name_len + 1; | |
408 | xd->name_len = name_len; | |
409 | xd->value_len = xsize; | |
410 | xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); | |
411 | ||
9fe4854c | 412 | rc = save_xattr_datum(c, xd); |
aa98d7cf KK |
413 | if (rc) { |
414 | kfree(xd->xname); | |
415 | jffs2_free_xattr_datum(xd); | |
416 | return ERR_PTR(rc); | |
417 | } | |
418 | ||
419 | /* Insert Hash Index */ | |
420 | i = hashkey % XATTRINDEX_HASHSIZE; | |
421 | list_add(&xd->xindex, &c->xattrindex[i]); | |
422 | ||
423 | c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); | |
424 | reclaim_xattr_datum(c); | |
425 | ||
426 | return xd; | |
427 | } | |
428 | ||
21b9879b | 429 | /* -------- xref related functions ------------------ |
aa98d7cf KK |
430 | * verify_xattr_ref(c, ref) |
431 | * is used to load xref information from medium. Because summary data does not | |
432 | * contain xid/ino, it's necessary to verify once while mounting process. | |
433 | * delete_xattr_ref_node(c, ref) | |
434 | * is used to delete a jffs2 node is dominated by xref. When EBS is enabled, | |
435 | * it overwrites the obsolete node by myself. | |
436 | * delete_xattr_ref(c, ref) | |
437 | * is used to delete jffs2_xattr_ref object. If the reference counter of xdatum | |
438 | * is refered by this xref become 0, delete_xattr_datum() is called later. | |
9fe4854c | 439 | * save_xattr_ref(c, ref) |
aa98d7cf | 440 | * is used to write xref to medium. |
9fe4854c | 441 | * create_xattr_ref(c, ic, xd) |
aa98d7cf KK |
442 | * is used to create a new xref and write to medium. |
443 | * jffs2_xattr_delete_inode(c, ic) | |
444 | * is called to remove xrefs related to obsolete inode when inode is unlinked. | |
445 | * jffs2_xattr_free_inode(c, ic) | |
446 | * is called to release xattr related objects when unmounting. | |
8f2b6f49 | 447 | * check_xattr_ref_inode(c, ic) |
aa98d7cf KK |
448 | * is used to confirm inode does not have duplicate xattr name/value pair. |
449 | * -------------------------------------------------- */ | |
450 | static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
451 | { | |
452 | struct jffs2_eraseblock *jeb; | |
453 | struct jffs2_raw_xref rr; | |
454 | size_t readlen; | |
455 | uint32_t crc, totlen; | |
456 | int rc; | |
457 | ||
458 | BUG_ON(ref_flags(ref->node) != REF_UNCHECKED); | |
459 | ||
460 | rc = jffs2_flash_read(c, ref_offset(ref->node), sizeof(rr), &readlen, (char *)&rr); | |
461 | if (rc || sizeof(rr) != readlen) { | |
89291a9d | 462 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", |
aa98d7cf KK |
463 | rc, sizeof(rr), readlen, ref_offset(ref->node)); |
464 | return rc ? rc : -EIO; | |
465 | } | |
466 | /* obsolete node */ | |
467 | crc = crc32(0, &rr, sizeof(rr) - 4); | |
468 | if (crc != je32_to_cpu(rr.node_crc)) { | |
469 | if (je32_to_cpu(rr.node_crc) != 0xffffffff) | |
470 | JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", | |
471 | ref_offset(ref->node), je32_to_cpu(rr.node_crc), crc); | |
472 | return EIO; | |
473 | } | |
474 | if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK | |
475 | || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF | |
476 | || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { | |
477 | JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " | |
89291a9d | 478 | "nodetype=%#04x/%#04x, totlen=%u/%zu\n", |
aa98d7cf KK |
479 | ref_offset(ref->node), je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, |
480 | je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, | |
481 | je32_to_cpu(rr.totlen), PAD(sizeof(rr))); | |
482 | return EIO; | |
483 | } | |
484 | ref->ino = je32_to_cpu(rr.ino); | |
485 | ref->xid = je32_to_cpu(rr.xid); | |
486 | ||
487 | /* fixup superblock/eraseblock info */ | |
488 | jeb = &c->blocks[ref_offset(ref->node) / c->sector_size]; | |
489 | totlen = PAD(sizeof(rr)); | |
490 | ||
491 | spin_lock(&c->erase_completion_lock); | |
492 | c->unchecked_size -= totlen; c->used_size += totlen; | |
493 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
494 | ref->node->flash_offset = ref_offset(ref->node) | REF_PRISTINE; | |
495 | spin_unlock(&c->erase_completion_lock); | |
496 | ||
497 | dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", | |
498 | ref->ino, ref->xid, ref_offset(ref->node)); | |
499 | return 0; | |
500 | } | |
501 | ||
502 | static void delete_xattr_ref_node(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
503 | { | |
504 | struct jffs2_raw_xref rr; | |
89291a9d | 505 | size_t length; |
aa98d7cf KK |
506 | int rc; |
507 | ||
508 | if (jffs2_sum_active()) { | |
509 | memset(&rr, 0xff, sizeof(rr)); | |
510 | rc = jffs2_flash_read(c, ref_offset(ref->node), | |
511 | sizeof(struct jffs2_unknown_node), | |
512 | &length, (char *)&rr); | |
513 | if (rc || length != sizeof(struct jffs2_unknown_node)) { | |
89291a9d | 514 | JFFS2_ERROR("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", |
aa98d7cf KK |
515 | rc, sizeof(struct jffs2_unknown_node), |
516 | length, ref_offset(ref->node)); | |
517 | } | |
518 | rc = jffs2_flash_write(c, ref_offset(ref->node), sizeof(rr), | |
519 | &length, (char *)&rr); | |
520 | if (rc || length != sizeof(struct jffs2_raw_xref)) { | |
89291a9d | 521 | JFFS2_ERROR("jffs2_flash_write()=%d, req=%zu, wrote=%zu at %#08x\n", |
aa98d7cf KK |
522 | rc, sizeof(rr), length, ref_offset(ref->node)); |
523 | } | |
524 | } | |
525 | spin_lock(&c->erase_completion_lock); | |
526 | ref->node->next_in_ino = NULL; | |
527 | spin_unlock(&c->erase_completion_lock); | |
528 | jffs2_mark_node_obsolete(c, ref->node); | |
529 | ref->node = NULL; | |
530 | } | |
531 | ||
532 | static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
533 | { | |
534 | /* must be called under down_write(xattr_sem) */ | |
535 | struct jffs2_xattr_datum *xd; | |
536 | ||
537 | BUG_ON(!ref->node); | |
538 | delete_xattr_ref_node(c, ref); | |
539 | ||
aa98d7cf KK |
540 | xd = ref->xd; |
541 | xd->refcnt--; | |
542 | if (!xd->refcnt) | |
543 | delete_xattr_datum(c, xd); | |
544 | jffs2_free_xattr_ref(ref); | |
545 | } | |
546 | ||
9fe4854c | 547 | static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
aa98d7cf KK |
548 | { |
549 | /* must be called under down_write(xattr_sem) */ | |
550 | struct jffs2_raw_node_ref *raw; | |
551 | struct jffs2_raw_xref rr; | |
89291a9d | 552 | size_t length; |
9fe4854c | 553 | uint32_t phys_ofs = write_ofs(c); |
aa98d7cf KK |
554 | int ret; |
555 | ||
aa98d7cf KK |
556 | rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
557 | rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); | |
558 | rr.totlen = cpu_to_je32(PAD(sizeof(rr))); | |
559 | rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); | |
560 | ||
561 | rr.ino = cpu_to_je32(ref->ic->ino); | |
562 | rr.xid = cpu_to_je32(ref->xd->xid); | |
563 | rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); | |
564 | ||
565 | ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); | |
566 | if (ret || sizeof(rr) != length) { | |
89291a9d | 567 | JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", |
aa98d7cf KK |
568 | ret, sizeof(rr), length, phys_ofs); |
569 | ret = ret ? ret : -EIO; | |
2f785402 DW |
570 | if (length) |
571 | jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); | |
572 | ||
aa98d7cf KK |
573 | return ret; |
574 | } | |
aa98d7cf | 575 | |
2f785402 | 576 | raw = jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), NULL); |
fcb75787 | 577 | /* FIXME */ raw->next_in_ino = (void *)ref; |
aa98d7cf KK |
578 | if (ref->node) |
579 | delete_xattr_ref_node(c, ref); | |
580 | ref->node = raw; | |
581 | ||
582 | dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, | |
9fe4854c | 588 | struct jffs2_xattr_datum *xd) |
aa98d7cf KK |
589 | { |
590 | /* must be called under down_write(xattr_sem) */ | |
591 | struct jffs2_xattr_ref *ref; | |
592 | int ret; | |
593 | ||
594 | ref = jffs2_alloc_xattr_ref(); | |
595 | if (!ref) | |
596 | return ERR_PTR(-ENOMEM); | |
597 | ref->ic = ic; | |
598 | ref->xd = xd; | |
599 | ||
9fe4854c | 600 | ret = save_xattr_ref(c, ref); |
aa98d7cf KK |
601 | if (ret) { |
602 | jffs2_free_xattr_ref(ref); | |
603 | return ERR_PTR(ret); | |
604 | } | |
605 | ||
606 | /* Chain to inode */ | |
8f2b6f49 KK |
607 | ref->next = ic->xref; |
608 | ic->xref = ref; | |
aa98d7cf KK |
609 | |
610 | return ref; /* success */ | |
611 | } | |
612 | ||
613 | void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) | |
614 | { | |
615 | /* It's called from jffs2_clear_inode() on inode removing. | |
616 | When an inode with XATTR is removed, those XATTRs must be removed. */ | |
617 | struct jffs2_xattr_ref *ref, *_ref; | |
618 | ||
619 | if (!ic || ic->nlink > 0) | |
620 | return; | |
621 | ||
622 | down_write(&c->xattr_sem); | |
8f2b6f49 KK |
623 | for (ref = ic->xref; ref; ref = _ref) { |
624 | _ref = ref->next; | |
aa98d7cf | 625 | delete_xattr_ref(c, ref); |
8f2b6f49 KK |
626 | } |
627 | ic->xref = NULL; | |
aa98d7cf KK |
628 | up_write(&c->xattr_sem); |
629 | } | |
630 | ||
631 | void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) | |
632 | { | |
633 | /* It's called from jffs2_free_ino_caches() until unmounting FS. */ | |
634 | struct jffs2_xattr_datum *xd; | |
635 | struct jffs2_xattr_ref *ref, *_ref; | |
636 | ||
637 | down_write(&c->xattr_sem); | |
8f2b6f49 KK |
638 | for (ref = ic->xref; ref; ref = _ref) { |
639 | _ref = ref->next; | |
aa98d7cf KK |
640 | xd = ref->xd; |
641 | xd->refcnt--; | |
642 | if (!xd->refcnt) { | |
643 | unload_xattr_datum(c, xd); | |
644 | jffs2_free_xattr_datum(xd); | |
645 | } | |
646 | jffs2_free_xattr_ref(ref); | |
647 | } | |
8f2b6f49 | 648 | ic->xref = NULL; |
aa98d7cf KK |
649 | up_write(&c->xattr_sem); |
650 | } | |
651 | ||
8f2b6f49 | 652 | static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
aa98d7cf | 653 | { |
8f2b6f49 | 654 | /* success of check_xattr_ref_inode() means taht inode (ic) dose not have |
aa98d7cf KK |
655 | * duplicate name/value pairs. If duplicate name/value pair would be found, |
656 | * one will be removed. | |
657 | */ | |
8f2b6f49 | 658 | struct jffs2_xattr_ref *ref, *cmp, **pref; |
aa98d7cf KK |
659 | int rc = 0; |
660 | ||
661 | if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) | |
662 | return 0; | |
663 | down_write(&c->xattr_sem); | |
664 | retry: | |
665 | rc = 0; | |
8f2b6f49 | 666 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
667 | if (!ref->xd->xname) { |
668 | rc = load_xattr_datum(c, ref->xd); | |
669 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 670 | *pref = ref->next; |
aa98d7cf KK |
671 | delete_xattr_ref(c, ref); |
672 | goto retry; | |
673 | } else if (unlikely(rc < 0)) | |
674 | goto out; | |
675 | } | |
8f2b6f49 | 676 | for (cmp=ref->next, pref=&ref->next; cmp; pref=&cmp->next, cmp=cmp->next) { |
aa98d7cf KK |
677 | if (!cmp->xd->xname) { |
678 | ref->xd->flags |= JFFS2_XFLAGS_BIND; | |
679 | rc = load_xattr_datum(c, cmp->xd); | |
680 | ref->xd->flags &= ~JFFS2_XFLAGS_BIND; | |
681 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 682 | *pref = cmp->next; |
aa98d7cf KK |
683 | delete_xattr_ref(c, cmp); |
684 | goto retry; | |
685 | } else if (unlikely(rc < 0)) | |
686 | goto out; | |
687 | } | |
688 | if (ref->xd->xprefix == cmp->xd->xprefix | |
689 | && !strcmp(ref->xd->xname, cmp->xd->xname)) { | |
8f2b6f49 | 690 | *pref = cmp->next; |
aa98d7cf KK |
691 | delete_xattr_ref(c, cmp); |
692 | goto retry; | |
693 | } | |
694 | } | |
695 | } | |
696 | ic->flags |= INO_FLAGS_XATTR_CHECKED; | |
697 | out: | |
698 | up_write(&c->xattr_sem); | |
699 | ||
700 | return rc; | |
701 | } | |
702 | ||
703 | /* -------- xattr subsystem functions --------------- | |
704 | * jffs2_init_xattr_subsystem(c) | |
705 | * is used to initialize semaphore and list_head, and some variables. | |
706 | * jffs2_find_xattr_datum(c, xid) | |
707 | * is used to lookup xdatum while scanning process. | |
708 | * jffs2_clear_xattr_subsystem(c) | |
709 | * is used to release any xattr related objects. | |
710 | * jffs2_build_xattr_subsystem(c) | |
711 | * is used to associate xdatum and xref while super block building process. | |
712 | * jffs2_setup_xattr_datum(c, xid, version) | |
713 | * is used to insert xdatum while scanning process. | |
714 | * -------------------------------------------------- */ | |
715 | void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) | |
716 | { | |
717 | int i; | |
718 | ||
719 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) | |
720 | INIT_LIST_HEAD(&c->xattrindex[i]); | |
aa98d7cf | 721 | INIT_LIST_HEAD(&c->xattr_unchecked); |
8f2b6f49 | 722 | c->xref_temp = NULL; |
aa98d7cf KK |
723 | |
724 | init_rwsem(&c->xattr_sem); | |
725 | c->xdatum_mem_usage = 0; | |
726 | c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ | |
727 | } | |
728 | ||
729 | static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) | |
730 | { | |
731 | struct jffs2_xattr_datum *xd; | |
732 | int i = xid % XATTRINDEX_HASHSIZE; | |
733 | ||
734 | /* It's only used in scanning/building process. */ | |
735 | BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); | |
736 | ||
737 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { | |
738 | if (xd->xid==xid) | |
739 | return xd; | |
740 | } | |
741 | return NULL; | |
742 | } | |
743 | ||
744 | void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) | |
745 | { | |
746 | struct jffs2_xattr_datum *xd, *_xd; | |
747 | struct jffs2_xattr_ref *ref, *_ref; | |
748 | int i; | |
749 | ||
8f2b6f49 KK |
750 | for (ref=c->xref_temp; ref; ref = _ref) { |
751 | _ref = ref->next; | |
aa98d7cf | 752 | jffs2_free_xattr_ref(ref); |
8f2b6f49 KK |
753 | } |
754 | c->xref_temp = NULL; | |
aa98d7cf KK |
755 | |
756 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { | |
757 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { | |
758 | list_del(&xd->xindex); | |
759 | if (xd->xname) | |
760 | kfree(xd->xname); | |
761 | jffs2_free_xattr_datum(xd); | |
762 | } | |
763 | } | |
764 | } | |
765 | ||
766 | void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) | |
767 | { | |
768 | struct jffs2_xattr_ref *ref, *_ref; | |
769 | struct jffs2_xattr_datum *xd, *_xd; | |
770 | struct jffs2_inode_cache *ic; | |
771 | int i, xdatum_count =0, xdatum_unchecked_count = 0, xref_count = 0; | |
772 | ||
773 | BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); | |
774 | ||
775 | /* Phase.1 */ | |
8f2b6f49 KK |
776 | for (ref=c->xref_temp; ref; ref=_ref) { |
777 | _ref = ref->next; | |
aa98d7cf KK |
778 | /* checking REF_UNCHECKED nodes */ |
779 | if (ref_flags(ref->node) != REF_PRISTINE) { | |
780 | if (verify_xattr_ref(c, ref)) { | |
781 | delete_xattr_ref_node(c, ref); | |
782 | jffs2_free_xattr_ref(ref); | |
783 | continue; | |
784 | } | |
785 | } | |
786 | /* At this point, ref->xid and ref->ino contain XID and inode number. | |
787 | ref->xd and ref->ic are not valid yet. */ | |
788 | xd = jffs2_find_xattr_datum(c, ref->xid); | |
789 | ic = jffs2_get_ino_cache(c, ref->ino); | |
790 | if (!xd || !ic) { | |
791 | if (ref_flags(ref->node) != REF_UNCHECKED) | |
792 | JFFS2_WARNING("xref(ino=%u, xid=%u) is orphan. \n", | |
793 | ref->ino, ref->xid); | |
794 | delete_xattr_ref_node(c, ref); | |
795 | jffs2_free_xattr_ref(ref); | |
796 | continue; | |
797 | } | |
798 | ref->xd = xd; | |
799 | ref->ic = ic; | |
800 | xd->refcnt++; | |
8f2b6f49 KK |
801 | ref->next = ic->xref; |
802 | ic->xref = ref; | |
aa98d7cf KK |
803 | xref_count++; |
804 | } | |
8f2b6f49 | 805 | c->xref_temp = NULL; |
aa98d7cf KK |
806 | /* After this, ref->xid/ino are NEVER used. */ |
807 | ||
808 | /* Phase.2 */ | |
809 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { | |
810 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { | |
811 | list_del_init(&xd->xindex); | |
812 | if (!xd->refcnt) { | |
813 | if (ref_flags(xd->node) != REF_UNCHECKED) | |
814 | JFFS2_WARNING("orphan xdatum(xid=%u, version=%u) at %#08x\n", | |
815 | xd->xid, xd->version, ref_offset(xd->node)); | |
816 | delete_xattr_datum(c, xd); | |
817 | continue; | |
818 | } | |
819 | if (ref_flags(xd->node) != REF_PRISTINE) { | |
820 | dbg_xattr("unchecked xdatum(xid=%u) at %#08x\n", | |
821 | xd->xid, ref_offset(xd->node)); | |
822 | list_add(&xd->xindex, &c->xattr_unchecked); | |
823 | xdatum_unchecked_count++; | |
824 | } | |
825 | xdatum_count++; | |
826 | } | |
827 | } | |
828 | /* build complete */ | |
829 | JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum (%u unchecked) and " | |
830 | "%u of xref found.\n", xdatum_count, xdatum_unchecked_count, xref_count); | |
831 | } | |
832 | ||
833 | struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, | |
834 | uint32_t xid, uint32_t version) | |
835 | { | |
836 | struct jffs2_xattr_datum *xd, *_xd; | |
837 | ||
838 | _xd = jffs2_find_xattr_datum(c, xid); | |
839 | if (_xd) { | |
840 | dbg_xattr("duplicate xdatum (xid=%u, version=%u/%u) at %#08x\n", | |
841 | xid, version, _xd->version, ref_offset(_xd->node)); | |
842 | if (version < _xd->version) | |
843 | return ERR_PTR(-EEXIST); | |
844 | } | |
845 | xd = jffs2_alloc_xattr_datum(); | |
846 | if (!xd) | |
847 | return ERR_PTR(-ENOMEM); | |
848 | xd->xid = xid; | |
849 | xd->version = version; | |
850 | if (xd->xid > c->highest_xid) | |
851 | c->highest_xid = xd->xid; | |
852 | list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); | |
853 | ||
854 | if (_xd) { | |
855 | list_del_init(&_xd->xindex); | |
856 | delete_xattr_datum_node(c, _xd); | |
857 | jffs2_free_xattr_datum(_xd); | |
858 | } | |
859 | return xd; | |
860 | } | |
861 | ||
862 | /* -------- xattr subsystem functions --------------- | |
863 | * xprefix_to_handler(xprefix) | |
864 | * is used to translate xprefix into xattr_handler. | |
865 | * jffs2_listxattr(dentry, buffer, size) | |
866 | * is an implementation of listxattr handler on jffs2. | |
867 | * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) | |
868 | * is an implementation of getxattr handler on jffs2. | |
869 | * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) | |
870 | * is an implementation of setxattr handler on jffs2. | |
871 | * -------------------------------------------------- */ | |
872 | struct xattr_handler *jffs2_xattr_handlers[] = { | |
873 | &jffs2_user_xattr_handler, | |
874 | #ifdef CONFIG_JFFS2_FS_SECURITY | |
875 | &jffs2_security_xattr_handler, | |
876 | #endif | |
877 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
878 | &jffs2_acl_access_xattr_handler, | |
879 | &jffs2_acl_default_xattr_handler, | |
880 | #endif | |
881 | &jffs2_trusted_xattr_handler, | |
882 | NULL | |
883 | }; | |
884 | ||
885 | static struct xattr_handler *xprefix_to_handler(int xprefix) { | |
886 | struct xattr_handler *ret; | |
887 | ||
888 | switch (xprefix) { | |
889 | case JFFS2_XPREFIX_USER: | |
890 | ret = &jffs2_user_xattr_handler; | |
891 | break; | |
892 | #ifdef CONFIG_JFFS2_FS_SECURITY | |
893 | case JFFS2_XPREFIX_SECURITY: | |
894 | ret = &jffs2_security_xattr_handler; | |
895 | break; | |
896 | #endif | |
897 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
898 | case JFFS2_XPREFIX_ACL_ACCESS: | |
899 | ret = &jffs2_acl_access_xattr_handler; | |
900 | break; | |
901 | case JFFS2_XPREFIX_ACL_DEFAULT: | |
902 | ret = &jffs2_acl_default_xattr_handler; | |
903 | break; | |
904 | #endif | |
905 | case JFFS2_XPREFIX_TRUSTED: | |
906 | ret = &jffs2_trusted_xattr_handler; | |
907 | break; | |
908 | default: | |
909 | ret = NULL; | |
910 | break; | |
911 | } | |
912 | return ret; | |
913 | } | |
914 | ||
915 | ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) | |
916 | { | |
917 | struct inode *inode = dentry->d_inode; | |
918 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
919 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
920 | struct jffs2_inode_cache *ic = f->inocache; | |
8f2b6f49 | 921 | struct jffs2_xattr_ref *ref, **pref; |
aa98d7cf KK |
922 | struct jffs2_xattr_datum *xd; |
923 | struct xattr_handler *xhandle; | |
924 | ssize_t len, rc; | |
925 | int retry = 0; | |
926 | ||
8f2b6f49 | 927 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
928 | if (unlikely(rc)) |
929 | return rc; | |
930 | ||
931 | down_read(&c->xattr_sem); | |
932 | retry: | |
933 | len = 0; | |
8f2b6f49 | 934 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
935 | BUG_ON(ref->ic != ic); |
936 | xd = ref->xd; | |
937 | if (!xd->xname) { | |
938 | /* xdatum is unchached */ | |
939 | if (!retry) { | |
940 | retry = 1; | |
941 | up_read(&c->xattr_sem); | |
942 | down_write(&c->xattr_sem); | |
943 | goto retry; | |
944 | } else { | |
945 | rc = load_xattr_datum(c, xd); | |
946 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 947 | *pref = ref->next; |
aa98d7cf KK |
948 | delete_xattr_ref(c, ref); |
949 | goto retry; | |
950 | } else if (unlikely(rc < 0)) | |
951 | goto out; | |
952 | } | |
953 | } | |
954 | xhandle = xprefix_to_handler(xd->xprefix); | |
955 | if (!xhandle) | |
956 | continue; | |
957 | if (buffer) { | |
958 | rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len); | |
959 | } else { | |
960 | rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len); | |
961 | } | |
962 | if (rc < 0) | |
963 | goto out; | |
964 | len += rc; | |
965 | } | |
966 | rc = len; | |
967 | out: | |
968 | if (!retry) { | |
969 | up_read(&c->xattr_sem); | |
970 | } else { | |
971 | up_write(&c->xattr_sem); | |
972 | } | |
973 | return rc; | |
974 | } | |
975 | ||
976 | int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, | |
977 | char *buffer, size_t size) | |
978 | { | |
979 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
980 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
981 | struct jffs2_inode_cache *ic = f->inocache; | |
982 | struct jffs2_xattr_datum *xd; | |
8f2b6f49 | 983 | struct jffs2_xattr_ref *ref, **pref; |
aa98d7cf KK |
984 | int rc, retry = 0; |
985 | ||
8f2b6f49 | 986 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
987 | if (unlikely(rc)) |
988 | return rc; | |
989 | ||
990 | down_read(&c->xattr_sem); | |
991 | retry: | |
8f2b6f49 | 992 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
993 | BUG_ON(ref->ic!=ic); |
994 | ||
995 | xd = ref->xd; | |
996 | if (xd->xprefix != xprefix) | |
997 | continue; | |
998 | if (!xd->xname) { | |
999 | /* xdatum is unchached */ | |
1000 | if (!retry) { | |
1001 | retry = 1; | |
1002 | up_read(&c->xattr_sem); | |
1003 | down_write(&c->xattr_sem); | |
1004 | goto retry; | |
1005 | } else { | |
1006 | rc = load_xattr_datum(c, xd); | |
1007 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 1008 | *pref = ref->next; |
aa98d7cf KK |
1009 | delete_xattr_ref(c, ref); |
1010 | goto retry; | |
1011 | } else if (unlikely(rc < 0)) { | |
1012 | goto out; | |
1013 | } | |
1014 | } | |
1015 | } | |
1016 | if (!strcmp(xname, xd->xname)) { | |
1017 | rc = xd->value_len; | |
1018 | if (buffer) { | |
1019 | if (size < rc) { | |
1020 | rc = -ERANGE; | |
1021 | } else { | |
1022 | memcpy(buffer, xd->xvalue, rc); | |
1023 | } | |
1024 | } | |
1025 | goto out; | |
1026 | } | |
1027 | } | |
1028 | rc = -ENODATA; | |
1029 | out: | |
1030 | if (!retry) { | |
1031 | up_read(&c->xattr_sem); | |
1032 | } else { | |
1033 | up_write(&c->xattr_sem); | |
1034 | } | |
1035 | return rc; | |
1036 | } | |
1037 | ||
1038 | int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, | |
1039 | const char *buffer, size_t size, int flags) | |
1040 | { | |
1041 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1042 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
1043 | struct jffs2_inode_cache *ic = f->inocache; | |
1044 | struct jffs2_xattr_datum *xd; | |
8f2b6f49 | 1045 | struct jffs2_xattr_ref *ref, *newref, **pref; |
9fe4854c | 1046 | uint32_t length, request; |
aa98d7cf KK |
1047 | int rc; |
1048 | ||
8f2b6f49 | 1049 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
1050 | if (unlikely(rc)) |
1051 | return rc; | |
1052 | ||
1053 | request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); | |
9fe4854c | 1054 | rc = jffs2_reserve_space(c, request, &length, |
aa98d7cf KK |
1055 | ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); |
1056 | if (rc) { | |
1057 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); | |
1058 | return rc; | |
1059 | } | |
1060 | ||
1061 | /* Find existing xattr */ | |
1062 | down_write(&c->xattr_sem); | |
1063 | retry: | |
8f2b6f49 | 1064 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
1065 | xd = ref->xd; |
1066 | if (xd->xprefix != xprefix) | |
1067 | continue; | |
1068 | if (!xd->xname) { | |
1069 | rc = load_xattr_datum(c, xd); | |
1070 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 1071 | *pref = ref->next; |
aa98d7cf KK |
1072 | delete_xattr_ref(c, ref); |
1073 | goto retry; | |
1074 | } else if (unlikely(rc < 0)) | |
1075 | goto out; | |
1076 | } | |
1077 | if (!strcmp(xd->xname, xname)) { | |
1078 | if (flags & XATTR_CREATE) { | |
1079 | rc = -EEXIST; | |
1080 | goto out; | |
1081 | } | |
1082 | if (!buffer) { | |
8f2b6f49 | 1083 | *pref = ref->next; |
aa98d7cf KK |
1084 | delete_xattr_ref(c, ref); |
1085 | rc = 0; | |
1086 | goto out; | |
1087 | } | |
1088 | goto found; | |
1089 | } | |
1090 | } | |
1091 | /* not found */ | |
aa98d7cf KK |
1092 | if (flags & XATTR_REPLACE) { |
1093 | rc = -ENODATA; | |
1094 | goto out; | |
1095 | } | |
1096 | if (!buffer) { | |
1097 | rc = -EINVAL; | |
1098 | goto out; | |
1099 | } | |
1100 | found: | |
9fe4854c | 1101 | xd = create_xattr_datum(c, xprefix, xname, buffer, size); |
aa98d7cf KK |
1102 | if (IS_ERR(xd)) { |
1103 | rc = PTR_ERR(xd); | |
1104 | goto out; | |
1105 | } | |
1106 | up_write(&c->xattr_sem); | |
1107 | jffs2_complete_reservation(c); | |
1108 | ||
1109 | /* create xattr_ref */ | |
1110 | request = PAD(sizeof(struct jffs2_raw_xref)); | |
9fe4854c | 1111 | rc = jffs2_reserve_space(c, request, &length, |
aa98d7cf KK |
1112 | ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); |
1113 | if (rc) { | |
1114 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); | |
1115 | down_write(&c->xattr_sem); | |
1116 | xd->refcnt--; | |
1117 | if (!xd->refcnt) | |
1118 | delete_xattr_datum(c, xd); | |
1119 | up_write(&c->xattr_sem); | |
1120 | return rc; | |
1121 | } | |
1122 | down_write(&c->xattr_sem); | |
8f2b6f49 KK |
1123 | if (ref) |
1124 | *pref = ref->next; | |
9fe4854c | 1125 | newref = create_xattr_ref(c, ic, xd); |
aa98d7cf | 1126 | if (IS_ERR(newref)) { |
8f2b6f49 KK |
1127 | if (ref) { |
1128 | ref->next = ic->xref; | |
1129 | ic->xref = ref; | |
1130 | } | |
aa98d7cf KK |
1131 | rc = PTR_ERR(newref); |
1132 | xd->refcnt--; | |
1133 | if (!xd->refcnt) | |
1134 | delete_xattr_datum(c, xd); | |
1135 | } else if (ref) { | |
aa98d7cf KK |
1136 | delete_xattr_ref(c, ref); |
1137 | } | |
1138 | out: | |
1139 | up_write(&c->xattr_sem); | |
1140 | jffs2_complete_reservation(c); | |
1141 | return rc; | |
1142 | } | |
1143 | ||
1144 | /* -------- garbage collector functions ------------- | |
1145 | * jffs2_garbage_collect_xattr_datum(c, xd) | |
1146 | * is used to move xdatum into new node. | |
1147 | * jffs2_garbage_collect_xattr_ref(c, ref) | |
1148 | * is used to move xref into new node. | |
aa98d7cf KK |
1149 | * jffs2_verify_xattr(c) |
1150 | * is used to call do_verify_xattr_datum() before garbage collecting. | |
1151 | * -------------------------------------------------- */ | |
084702e0 | 1152 | int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
aa98d7cf | 1153 | { |
9fe4854c | 1154 | uint32_t totlen, length, old_ofs; |
084702e0 | 1155 | int rc = -EINVAL; |
aa98d7cf | 1156 | |
084702e0 | 1157 | down_write(&c->xattr_sem); |
aa98d7cf KK |
1158 | BUG_ON(!xd->node); |
1159 | ||
1160 | old_ofs = ref_offset(xd->node); | |
1161 | totlen = ref_totlen(c, c->gcblock, xd->node); | |
1162 | if (totlen < sizeof(struct jffs2_raw_xattr)) | |
084702e0 | 1163 | goto out; |
aa98d7cf KK |
1164 | |
1165 | if (!xd->xname) { | |
1166 | rc = load_xattr_datum(c, xd); | |
1167 | if (unlikely(rc > 0)) { | |
1168 | delete_xattr_datum_node(c, xd); | |
084702e0 KK |
1169 | rc = 0; |
1170 | goto out; | |
aa98d7cf | 1171 | } else if (unlikely(rc < 0)) |
084702e0 | 1172 | goto out; |
aa98d7cf | 1173 | } |
9fe4854c | 1174 | rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); |
aa98d7cf KK |
1175 | if (rc || length < totlen) { |
1176 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, totlen); | |
084702e0 KK |
1177 | rc = rc ? rc : -EBADFD; |
1178 | goto out; | |
aa98d7cf | 1179 | } |
9fe4854c | 1180 | rc = save_xattr_datum(c, xd); |
aa98d7cf KK |
1181 | if (!rc) |
1182 | dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", | |
1183 | xd->xid, xd->version, old_ofs, ref_offset(xd->node)); | |
084702e0 KK |
1184 | out: |
1185 | up_write(&c->xattr_sem); | |
aa98d7cf KK |
1186 | return rc; |
1187 | } | |
1188 | ||
1189 | ||
084702e0 | 1190 | int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
aa98d7cf | 1191 | { |
9fe4854c | 1192 | uint32_t totlen, length, old_ofs; |
084702e0 | 1193 | int rc = -EINVAL; |
aa98d7cf | 1194 | |
084702e0 | 1195 | down_write(&c->xattr_sem); |
aa98d7cf KK |
1196 | BUG_ON(!ref->node); |
1197 | ||
1198 | old_ofs = ref_offset(ref->node); | |
1199 | totlen = ref_totlen(c, c->gcblock, ref->node); | |
1200 | if (totlen != sizeof(struct jffs2_raw_xref)) | |
084702e0 KK |
1201 | goto out; |
1202 | ||
9fe4854c | 1203 | rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); |
aa98d7cf KK |
1204 | if (rc || length < totlen) { |
1205 | JFFS2_WARNING("%s: jffs2_reserve_space() = %d, request = %u\n", | |
1206 | __FUNCTION__, rc, totlen); | |
084702e0 KK |
1207 | rc = rc ? rc : -EBADFD; |
1208 | goto out; | |
aa98d7cf | 1209 | } |
9fe4854c | 1210 | rc = save_xattr_ref(c, ref); |
aa98d7cf KK |
1211 | if (!rc) |
1212 | dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", | |
1213 | ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); | |
084702e0 KK |
1214 | out: |
1215 | up_write(&c->xattr_sem); | |
aa98d7cf KK |
1216 | return rc; |
1217 | } | |
1218 | ||
aa98d7cf KK |
1219 | int jffs2_verify_xattr(struct jffs2_sb_info *c) |
1220 | { | |
1221 | struct jffs2_xattr_datum *xd, *_xd; | |
1222 | int rc; | |
1223 | ||
1224 | down_write(&c->xattr_sem); | |
1225 | list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { | |
1226 | rc = do_verify_xattr_datum(c, xd); | |
1227 | if (rc == 0) { | |
1228 | list_del_init(&xd->xindex); | |
1229 | break; | |
1230 | } else if (rc > 0) { | |
1231 | list_del_init(&xd->xindex); | |
1232 | delete_xattr_datum_node(c, xd); | |
1233 | } | |
1234 | } | |
1235 | up_write(&c->xattr_sem); | |
1236 | ||
1237 | return list_empty(&c->xattr_unchecked) ? 1 : 0; | |
1238 | } |