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1 | /* | |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright © 2006 NEC Corporation | |
5 | * | |
6 | * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/time.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/highmem.h> | |
18 | #include <linux/crc32.h> | |
19 | #include <linux/jffs2.h> | |
20 | #include <linux/xattr.h> | |
21 | #include <linux/mtd/mtd.h> | |
22 | #include "nodelist.h" | |
23 | /* -------- xdatum related functions ---------------- | |
24 | * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) | |
25 | * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is | |
26 | * the index of the xattr name/value pair cache (c->xattrindex). | |
27 | * is_xattr_datum_unchecked(c, xd) | |
28 | * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not | |
29 | * unchecked, it returns 0. | |
30 | * unload_xattr_datum(c, xd) | |
31 | * is used to release xattr name/value pair and detach from c->xattrindex. | |
32 | * reclaim_xattr_datum(c) | |
33 | * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when | |
34 | * memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold | |
35 | * is hard coded as 32KiB. | |
36 | * do_verify_xattr_datum(c, xd) | |
37 | * is used to load the xdatum informations without name/value pair from the medium. | |
38 | * It's necessary once, because those informations are not collected during mounting | |
39 | * process when EBS is enabled. | |
40 | * 0 will be returned, if success. An negative return value means recoverable error, and | |
41 | * positive return value means unrecoverable error. Thus, caller must remove this xdatum | |
42 | * and xref when it returned positive value. | |
43 | * do_load_xattr_datum(c, xd) | |
44 | * is used to load name/value pair from the medium. | |
45 | * The meanings of return value is same as do_verify_xattr_datum(). | |
46 | * load_xattr_datum(c, xd) | |
47 | * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). | |
48 | * If xd need to call do_verify_xattr_datum() at first, it's called before calling | |
49 | * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). | |
50 | * save_xattr_datum(c, xd) | |
51 | * is used to write xdatum to medium. xd->version will be incremented. | |
52 | * create_xattr_datum(c, xprefix, xname, xvalue, xsize) | |
53 | * is used to create new xdatum and write to medium. | |
54 | * unrefer_xattr_datum(c, xd) | |
55 | * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD | |
56 | * is set on xd->flags and chained xattr_dead_list or release it immediately. | |
57 | * In the first case, the garbage collector release it later. | |
58 | * -------------------------------------------------- */ | |
59 | static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) | |
60 | { | |
61 | int name_len = strlen(xname); | |
62 | ||
63 | return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); | |
64 | } | |
65 | ||
66 | static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
67 | { | |
68 | struct jffs2_raw_node_ref *raw; | |
69 | int rc = 0; | |
70 | ||
71 | spin_lock(&c->erase_completion_lock); | |
72 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { | |
73 | if (ref_flags(raw) == REF_UNCHECKED) { | |
74 | rc = 1; | |
75 | break; | |
76 | } | |
77 | } | |
78 | spin_unlock(&c->erase_completion_lock); | |
79 | return rc; | |
80 | } | |
81 | ||
82 | static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
83 | { | |
84 | /* must be called under down_write(xattr_sem) */ | |
85 | D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); | |
86 | if (xd->xname) { | |
87 | c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); | |
88 | kfree(xd->xname); | |
89 | } | |
90 | ||
91 | list_del_init(&xd->xindex); | |
92 | xd->hashkey = 0; | |
93 | xd->xname = NULL; | |
94 | xd->xvalue = NULL; | |
95 | } | |
96 | ||
97 | static void reclaim_xattr_datum(struct jffs2_sb_info *c) | |
98 | { | |
99 | /* must be called under down_write(xattr_sem) */ | |
100 | struct jffs2_xattr_datum *xd, *_xd; | |
101 | uint32_t target, before; | |
102 | static int index = 0; | |
103 | int count; | |
104 | ||
105 | if (c->xdatum_mem_threshold > c->xdatum_mem_usage) | |
106 | return; | |
107 | ||
108 | before = c->xdatum_mem_usage; | |
109 | target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ | |
110 | for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { | |
111 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { | |
112 | if (xd->flags & JFFS2_XFLAGS_HOT) { | |
113 | xd->flags &= ~JFFS2_XFLAGS_HOT; | |
114 | } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { | |
115 | unload_xattr_datum(c, xd); | |
116 | } | |
117 | if (c->xdatum_mem_usage <= target) | |
118 | goto out; | |
119 | } | |
120 | index = (index+1) % XATTRINDEX_HASHSIZE; | |
121 | } | |
122 | out: | |
123 | JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", | |
124 | before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); | |
125 | } | |
126 | ||
127 | static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
128 | { | |
129 | /* must be called under down_write(xattr_sem) */ | |
130 | struct jffs2_eraseblock *jeb; | |
131 | struct jffs2_raw_node_ref *raw; | |
132 | struct jffs2_raw_xattr rx; | |
133 | size_t readlen; | |
134 | uint32_t crc, offset, totlen; | |
135 | int rc; | |
136 | ||
137 | spin_lock(&c->erase_completion_lock); | |
138 | offset = ref_offset(xd->node); | |
139 | if (ref_flags(xd->node) == REF_PRISTINE) | |
140 | goto complete; | |
141 | spin_unlock(&c->erase_completion_lock); | |
142 | ||
143 | rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); | |
144 | if (rc || readlen != sizeof(rx)) { | |
145 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", | |
146 | rc, sizeof(rx), readlen, offset); | |
147 | return rc ? rc : -EIO; | |
148 | } | |
149 | crc = crc32(0, &rx, sizeof(rx) - 4); | |
150 | if (crc != je32_to_cpu(rx.node_crc)) { | |
151 | JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", | |
152 | offset, je32_to_cpu(rx.hdr_crc), crc); | |
153 | xd->flags |= JFFS2_XFLAGS_INVALID; | |
154 | return EIO; | |
155 | } | |
156 | totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); | |
157 | if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK | |
158 | || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR | |
159 | || je32_to_cpu(rx.totlen) != totlen | |
160 | || je32_to_cpu(rx.xid) != xd->xid | |
161 | || je32_to_cpu(rx.version) != xd->version) { | |
162 | JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " | |
163 | "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", | |
164 | offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, | |
165 | je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, | |
166 | je32_to_cpu(rx.totlen), totlen, | |
167 | je32_to_cpu(rx.xid), xd->xid, | |
168 | je32_to_cpu(rx.version), xd->version); | |
169 | xd->flags |= JFFS2_XFLAGS_INVALID; | |
170 | return EIO; | |
171 | } | |
172 | xd->xprefix = rx.xprefix; | |
173 | xd->name_len = rx.name_len; | |
174 | xd->value_len = je16_to_cpu(rx.value_len); | |
175 | xd->data_crc = je32_to_cpu(rx.data_crc); | |
176 | ||
177 | spin_lock(&c->erase_completion_lock); | |
178 | complete: | |
179 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { | |
180 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; | |
181 | totlen = PAD(ref_totlen(c, jeb, raw)); | |
182 | if (ref_flags(raw) == REF_UNCHECKED) { | |
183 | c->unchecked_size -= totlen; c->used_size += totlen; | |
184 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
185 | } | |
186 | raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); | |
187 | } | |
188 | spin_unlock(&c->erase_completion_lock); | |
189 | ||
190 | /* unchecked xdatum is chained with c->xattr_unchecked */ | |
191 | list_del_init(&xd->xindex); | |
192 | ||
193 | dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n", | |
194 | xd->xid, xd->version); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
200 | { | |
201 | /* must be called under down_write(xattr_sem) */ | |
202 | char *data; | |
203 | size_t readlen; | |
204 | uint32_t crc, length; | |
205 | int i, ret, retry = 0; | |
206 | ||
207 | BUG_ON(ref_flags(xd->node) != REF_PRISTINE); | |
208 | BUG_ON(!list_empty(&xd->xindex)); | |
209 | retry: | |
210 | length = xd->name_len + 1 + xd->value_len; | |
211 | data = kmalloc(length, GFP_KERNEL); | |
212 | if (!data) | |
213 | return -ENOMEM; | |
214 | ||
215 | ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), | |
216 | length, &readlen, data); | |
217 | ||
218 | if (ret || length!=readlen) { | |
219 | JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", | |
220 | ret, length, readlen, ref_offset(xd->node)); | |
221 | kfree(data); | |
222 | return ret ? ret : -EIO; | |
223 | } | |
224 | ||
225 | data[xd->name_len] = '\0'; | |
226 | crc = crc32(0, data, length); | |
227 | if (crc != xd->data_crc) { | |
228 | JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)" | |
229 | " at %#08x, read: 0x%08x calculated: 0x%08x\n", | |
230 | ref_offset(xd->node), xd->data_crc, crc); | |
231 | kfree(data); | |
232 | xd->flags |= JFFS2_XFLAGS_INVALID; | |
233 | return EIO; | |
234 | } | |
235 | ||
236 | xd->flags |= JFFS2_XFLAGS_HOT; | |
237 | xd->xname = data; | |
238 | xd->xvalue = data + xd->name_len+1; | |
239 | ||
240 | c->xdatum_mem_usage += length; | |
241 | ||
242 | xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); | |
243 | i = xd->hashkey % XATTRINDEX_HASHSIZE; | |
244 | list_add(&xd->xindex, &c->xattrindex[i]); | |
245 | if (!retry) { | |
246 | retry = 1; | |
247 | reclaim_xattr_datum(c); | |
248 | if (!xd->xname) | |
249 | goto retry; | |
250 | } | |
251 | ||
252 | dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", | |
253 | xd->xid, xd->xprefix, xd->xname); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
259 | { | |
260 | /* must be called under down_write(xattr_sem); | |
261 | * rc < 0 : recoverable error, try again | |
262 | * rc = 0 : success | |
263 | * rc > 0 : Unrecoverable error, this node should be deleted. | |
264 | */ | |
265 | int rc = 0; | |
266 | ||
267 | BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); | |
268 | if (xd->xname) | |
269 | return 0; | |
270 | if (xd->flags & JFFS2_XFLAGS_INVALID) | |
271 | return EIO; | |
272 | if (unlikely(is_xattr_datum_unchecked(c, xd))) | |
273 | rc = do_verify_xattr_datum(c, xd); | |
274 | if (!rc) | |
275 | rc = do_load_xattr_datum(c, xd); | |
276 | return rc; | |
277 | } | |
278 | ||
279 | static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
280 | { | |
281 | /* must be called under down_write(xattr_sem) */ | |
282 | struct jffs2_raw_xattr rx; | |
283 | struct kvec vecs[2]; | |
284 | size_t length; | |
285 | int rc, totlen; | |
286 | uint32_t phys_ofs = write_ofs(c); | |
287 | ||
288 | BUG_ON(!xd->xname); | |
289 | BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); | |
290 | ||
291 | vecs[0].iov_base = ℞ | |
292 | vecs[0].iov_len = sizeof(rx); | |
293 | vecs[1].iov_base = xd->xname; | |
294 | vecs[1].iov_len = xd->name_len + 1 + xd->value_len; | |
295 | totlen = vecs[0].iov_len + vecs[1].iov_len; | |
296 | ||
297 | /* Setup raw-xattr */ | |
298 | memset(&rx, 0, sizeof(rx)); | |
299 | rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
300 | rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); | |
301 | rx.totlen = cpu_to_je32(PAD(totlen)); | |
302 | rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); | |
303 | ||
304 | rx.xid = cpu_to_je32(xd->xid); | |
305 | rx.version = cpu_to_je32(++xd->version); | |
306 | rx.xprefix = xd->xprefix; | |
307 | rx.name_len = xd->name_len; | |
308 | rx.value_len = cpu_to_je16(xd->value_len); | |
309 | rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); | |
310 | rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); | |
311 | ||
312 | rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); | |
313 | if (rc || totlen != length) { | |
314 | JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", | |
315 | rc, totlen, length, phys_ofs); | |
316 | rc = rc ? rc : -EIO; | |
317 | if (length) | |
318 | jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); | |
319 | ||
320 | return rc; | |
321 | } | |
322 | /* success */ | |
323 | jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); | |
324 | ||
325 | dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", | |
326 | xd->xid, xd->version, xd->xprefix, xd->xname); | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, | |
332 | int xprefix, const char *xname, | |
333 | const char *xvalue, int xsize) | |
334 | { | |
335 | /* must be called under down_write(xattr_sem) */ | |
336 | struct jffs2_xattr_datum *xd; | |
337 | uint32_t hashkey, name_len; | |
338 | char *data; | |
339 | int i, rc; | |
340 | ||
341 | /* Search xattr_datum has same xname/xvalue by index */ | |
342 | hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); | |
343 | i = hashkey % XATTRINDEX_HASHSIZE; | |
344 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { | |
345 | if (xd->hashkey==hashkey | |
346 | && xd->xprefix==xprefix | |
347 | && xd->value_len==xsize | |
348 | && !strcmp(xd->xname, xname) | |
349 | && !memcmp(xd->xvalue, xvalue, xsize)) { | |
350 | atomic_inc(&xd->refcnt); | |
351 | return xd; | |
352 | } | |
353 | } | |
354 | ||
355 | /* Not found, Create NEW XATTR-Cache */ | |
356 | name_len = strlen(xname); | |
357 | ||
358 | xd = jffs2_alloc_xattr_datum(); | |
359 | if (!xd) | |
360 | return ERR_PTR(-ENOMEM); | |
361 | ||
362 | data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); | |
363 | if (!data) { | |
364 | jffs2_free_xattr_datum(xd); | |
365 | return ERR_PTR(-ENOMEM); | |
366 | } | |
367 | strcpy(data, xname); | |
368 | memcpy(data + name_len + 1, xvalue, xsize); | |
369 | ||
370 | atomic_set(&xd->refcnt, 1); | |
371 | xd->xid = ++c->highest_xid; | |
372 | xd->flags |= JFFS2_XFLAGS_HOT; | |
373 | xd->xprefix = xprefix; | |
374 | ||
375 | xd->hashkey = hashkey; | |
376 | xd->xname = data; | |
377 | xd->xvalue = data + name_len + 1; | |
378 | xd->name_len = name_len; | |
379 | xd->value_len = xsize; | |
380 | xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); | |
381 | ||
382 | rc = save_xattr_datum(c, xd); | |
383 | if (rc) { | |
384 | kfree(xd->xname); | |
385 | jffs2_free_xattr_datum(xd); | |
386 | return ERR_PTR(rc); | |
387 | } | |
388 | ||
389 | /* Insert Hash Index */ | |
390 | i = hashkey % XATTRINDEX_HASHSIZE; | |
391 | list_add(&xd->xindex, &c->xattrindex[i]); | |
392 | ||
393 | c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); | |
394 | reclaim_xattr_datum(c); | |
395 | ||
396 | return xd; | |
397 | } | |
398 | ||
399 | static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
400 | { | |
401 | /* must be called under down_write(xattr_sem) */ | |
402 | if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { | |
403 | unload_xattr_datum(c, xd); | |
404 | xd->flags |= JFFS2_XFLAGS_DEAD; | |
405 | if (xd->node == (void *)xd) { | |
406 | BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); | |
407 | jffs2_free_xattr_datum(xd); | |
408 | } else { | |
409 | list_add(&xd->xindex, &c->xattr_dead_list); | |
410 | } | |
411 | spin_unlock(&c->erase_completion_lock); | |
412 | ||
413 | dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", | |
414 | xd->xid, xd->version); | |
415 | } | |
416 | } | |
417 | ||
418 | /* -------- xref related functions ------------------ | |
419 | * verify_xattr_ref(c, ref) | |
420 | * is used to load xref information from medium. Because summary data does not | |
421 | * contain xid/ino, it's necessary to verify once while mounting process. | |
422 | * save_xattr_ref(c, ref) | |
423 | * is used to write xref to medium. If delete marker is marked, it write | |
424 | * a delete marker of xref into medium. | |
425 | * create_xattr_ref(c, ic, xd) | |
426 | * is used to create a new xref and write to medium. | |
427 | * delete_xattr_ref(c, ref) | |
428 | * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, | |
429 | * and allows GC to reclaim those physical nodes. | |
430 | * jffs2_xattr_delete_inode(c, ic) | |
431 | * is called to remove xrefs related to obsolete inode when inode is unlinked. | |
432 | * jffs2_xattr_free_inode(c, ic) | |
433 | * is called to release xattr related objects when unmounting. | |
434 | * check_xattr_ref_inode(c, ic) | |
435 | * is used to confirm inode does not have duplicate xattr name/value pair. | |
436 | * -------------------------------------------------- */ | |
437 | static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
438 | { | |
439 | struct jffs2_eraseblock *jeb; | |
440 | struct jffs2_raw_node_ref *raw; | |
441 | struct jffs2_raw_xref rr; | |
442 | size_t readlen; | |
443 | uint32_t crc, offset, totlen; | |
444 | int rc; | |
445 | ||
446 | spin_lock(&c->erase_completion_lock); | |
447 | if (ref_flags(ref->node) != REF_UNCHECKED) | |
448 | goto complete; | |
449 | offset = ref_offset(ref->node); | |
450 | spin_unlock(&c->erase_completion_lock); | |
451 | ||
452 | rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); | |
453 | if (rc || sizeof(rr) != readlen) { | |
454 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", | |
455 | rc, sizeof(rr), readlen, offset); | |
456 | return rc ? rc : -EIO; | |
457 | } | |
458 | /* obsolete node */ | |
459 | crc = crc32(0, &rr, sizeof(rr) - 4); | |
460 | if (crc != je32_to_cpu(rr.node_crc)) { | |
461 | JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", | |
462 | offset, je32_to_cpu(rr.node_crc), crc); | |
463 | return EIO; | |
464 | } | |
465 | if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK | |
466 | || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF | |
467 | || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { | |
468 | JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " | |
469 | "nodetype=%#04x/%#04x, totlen=%u/%zu\n", | |
470 | offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, | |
471 | je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, | |
472 | je32_to_cpu(rr.totlen), PAD(sizeof(rr))); | |
473 | return EIO; | |
474 | } | |
475 | ref->ino = je32_to_cpu(rr.ino); | |
476 | ref->xid = je32_to_cpu(rr.xid); | |
477 | ref->xseqno = je32_to_cpu(rr.xseqno); | |
478 | if (ref->xseqno > c->highest_xseqno) | |
479 | c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); | |
480 | ||
481 | spin_lock(&c->erase_completion_lock); | |
482 | complete: | |
483 | for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { | |
484 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; | |
485 | totlen = PAD(ref_totlen(c, jeb, raw)); | |
486 | if (ref_flags(raw) == REF_UNCHECKED) { | |
487 | c->unchecked_size -= totlen; c->used_size += totlen; | |
488 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
489 | } | |
490 | raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); | |
491 | } | |
492 | spin_unlock(&c->erase_completion_lock); | |
493 | ||
494 | dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", | |
495 | ref->ino, ref->xid, ref_offset(ref->node)); | |
496 | return 0; | |
497 | } | |
498 | ||
499 | static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
500 | { | |
501 | /* must be called under down_write(xattr_sem) */ | |
502 | struct jffs2_raw_xref rr; | |
503 | size_t length; | |
504 | uint32_t xseqno, phys_ofs = write_ofs(c); | |
505 | int ret; | |
506 | ||
507 | rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
508 | rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); | |
509 | rr.totlen = cpu_to_je32(PAD(sizeof(rr))); | |
510 | rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); | |
511 | ||
512 | xseqno = (c->highest_xseqno += 2); | |
513 | if (is_xattr_ref_dead(ref)) { | |
514 | xseqno |= XREF_DELETE_MARKER; | |
515 | rr.ino = cpu_to_je32(ref->ino); | |
516 | rr.xid = cpu_to_je32(ref->xid); | |
517 | } else { | |
518 | rr.ino = cpu_to_je32(ref->ic->ino); | |
519 | rr.xid = cpu_to_je32(ref->xd->xid); | |
520 | } | |
521 | rr.xseqno = cpu_to_je32(xseqno); | |
522 | rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); | |
523 | ||
524 | ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); | |
525 | if (ret || sizeof(rr) != length) { | |
526 | JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", | |
527 | ret, sizeof(rr), length, phys_ofs); | |
528 | ret = ret ? ret : -EIO; | |
529 | if (length) | |
530 | jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); | |
531 | ||
532 | return ret; | |
533 | } | |
534 | /* success */ | |
535 | ref->xseqno = xseqno; | |
536 | jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); | |
537 | ||
538 | dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, | |
544 | struct jffs2_xattr_datum *xd) | |
545 | { | |
546 | /* must be called under down_write(xattr_sem) */ | |
547 | struct jffs2_xattr_ref *ref; | |
548 | int ret; | |
549 | ||
550 | ref = jffs2_alloc_xattr_ref(); | |
551 | if (!ref) | |
552 | return ERR_PTR(-ENOMEM); | |
553 | ref->ic = ic; | |
554 | ref->xd = xd; | |
555 | ||
556 | ret = save_xattr_ref(c, ref); | |
557 | if (ret) { | |
558 | jffs2_free_xattr_ref(ref); | |
559 | return ERR_PTR(ret); | |
560 | } | |
561 | ||
562 | /* Chain to inode */ | |
563 | ref->next = ic->xref; | |
564 | ic->xref = ref; | |
565 | ||
566 | return ref; /* success */ | |
567 | } | |
568 | ||
569 | static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
570 | { | |
571 | /* must be called under down_write(xattr_sem) */ | |
572 | struct jffs2_xattr_datum *xd; | |
573 | ||
574 | xd = ref->xd; | |
575 | ref->xseqno |= XREF_DELETE_MARKER; | |
576 | ref->ino = ref->ic->ino; | |
577 | ref->xid = ref->xd->xid; | |
578 | spin_lock(&c->erase_completion_lock); | |
579 | ref->next = c->xref_dead_list; | |
580 | c->xref_dead_list = ref; | |
581 | spin_unlock(&c->erase_completion_lock); | |
582 | ||
583 | dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", | |
584 | ref->ino, ref->xid, ref->xseqno); | |
585 | ||
586 | unrefer_xattr_datum(c, xd); | |
587 | } | |
588 | ||
589 | void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) | |
590 | { | |
591 | /* It's called from jffs2_evict_inode() on inode removing. | |
592 | When an inode with XATTR is removed, those XATTRs must be removed. */ | |
593 | struct jffs2_xattr_ref *ref, *_ref; | |
594 | ||
595 | if (!ic || ic->pino_nlink > 0) | |
596 | return; | |
597 | ||
598 | down_write(&c->xattr_sem); | |
599 | for (ref = ic->xref; ref; ref = _ref) { | |
600 | _ref = ref->next; | |
601 | delete_xattr_ref(c, ref); | |
602 | } | |
603 | ic->xref = NULL; | |
604 | up_write(&c->xattr_sem); | |
605 | } | |
606 | ||
607 | void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) | |
608 | { | |
609 | /* It's called from jffs2_free_ino_caches() until unmounting FS. */ | |
610 | struct jffs2_xattr_datum *xd; | |
611 | struct jffs2_xattr_ref *ref, *_ref; | |
612 | ||
613 | down_write(&c->xattr_sem); | |
614 | for (ref = ic->xref; ref; ref = _ref) { | |
615 | _ref = ref->next; | |
616 | xd = ref->xd; | |
617 | if (atomic_dec_and_test(&xd->refcnt)) { | |
618 | unload_xattr_datum(c, xd); | |
619 | jffs2_free_xattr_datum(xd); | |
620 | } | |
621 | jffs2_free_xattr_ref(ref); | |
622 | } | |
623 | ic->xref = NULL; | |
624 | up_write(&c->xattr_sem); | |
625 | } | |
626 | ||
627 | static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) | |
628 | { | |
629 | /* success of check_xattr_ref_inode() means that inode (ic) dose not have | |
630 | * duplicate name/value pairs. If duplicate name/value pair would be found, | |
631 | * one will be removed. | |
632 | */ | |
633 | struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; | |
634 | int rc = 0; | |
635 | ||
636 | if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) | |
637 | return 0; | |
638 | down_write(&c->xattr_sem); | |
639 | retry: | |
640 | rc = 0; | |
641 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { | |
642 | if (!ref->xd->xname) { | |
643 | rc = load_xattr_datum(c, ref->xd); | |
644 | if (unlikely(rc > 0)) { | |
645 | *pref = ref->next; | |
646 | delete_xattr_ref(c, ref); | |
647 | goto retry; | |
648 | } else if (unlikely(rc < 0)) | |
649 | goto out; | |
650 | } | |
651 | for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { | |
652 | if (!cmp->xd->xname) { | |
653 | ref->xd->flags |= JFFS2_XFLAGS_BIND; | |
654 | rc = load_xattr_datum(c, cmp->xd); | |
655 | ref->xd->flags &= ~JFFS2_XFLAGS_BIND; | |
656 | if (unlikely(rc > 0)) { | |
657 | *pcmp = cmp->next; | |
658 | delete_xattr_ref(c, cmp); | |
659 | goto retry; | |
660 | } else if (unlikely(rc < 0)) | |
661 | goto out; | |
662 | } | |
663 | if (ref->xd->xprefix == cmp->xd->xprefix | |
664 | && !strcmp(ref->xd->xname, cmp->xd->xname)) { | |
665 | if (ref->xseqno > cmp->xseqno) { | |
666 | *pcmp = cmp->next; | |
667 | delete_xattr_ref(c, cmp); | |
668 | } else { | |
669 | *pref = ref->next; | |
670 | delete_xattr_ref(c, ref); | |
671 | } | |
672 | goto retry; | |
673 | } | |
674 | } | |
675 | } | |
676 | ic->flags |= INO_FLAGS_XATTR_CHECKED; | |
677 | out: | |
678 | up_write(&c->xattr_sem); | |
679 | ||
680 | return rc; | |
681 | } | |
682 | ||
683 | /* -------- xattr subsystem functions --------------- | |
684 | * jffs2_init_xattr_subsystem(c) | |
685 | * is used to initialize semaphore and list_head, and some variables. | |
686 | * jffs2_find_xattr_datum(c, xid) | |
687 | * is used to lookup xdatum while scanning process. | |
688 | * jffs2_clear_xattr_subsystem(c) | |
689 | * is used to release any xattr related objects. | |
690 | * jffs2_build_xattr_subsystem(c) | |
691 | * is used to associate xdatum and xref while super block building process. | |
692 | * jffs2_setup_xattr_datum(c, xid, version) | |
693 | * is used to insert xdatum while scanning process. | |
694 | * -------------------------------------------------- */ | |
695 | void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) | |
696 | { | |
697 | int i; | |
698 | ||
699 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) | |
700 | INIT_LIST_HEAD(&c->xattrindex[i]); | |
701 | INIT_LIST_HEAD(&c->xattr_unchecked); | |
702 | INIT_LIST_HEAD(&c->xattr_dead_list); | |
703 | c->xref_dead_list = NULL; | |
704 | c->xref_temp = NULL; | |
705 | ||
706 | init_rwsem(&c->xattr_sem); | |
707 | c->highest_xid = 0; | |
708 | c->highest_xseqno = 0; | |
709 | c->xdatum_mem_usage = 0; | |
710 | c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ | |
711 | } | |
712 | ||
713 | static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) | |
714 | { | |
715 | struct jffs2_xattr_datum *xd; | |
716 | int i = xid % XATTRINDEX_HASHSIZE; | |
717 | ||
718 | /* It's only used in scanning/building process. */ | |
719 | BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); | |
720 | ||
721 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { | |
722 | if (xd->xid==xid) | |
723 | return xd; | |
724 | } | |
725 | return NULL; | |
726 | } | |
727 | ||
728 | void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) | |
729 | { | |
730 | struct jffs2_xattr_datum *xd, *_xd; | |
731 | struct jffs2_xattr_ref *ref, *_ref; | |
732 | int i; | |
733 | ||
734 | for (ref=c->xref_temp; ref; ref = _ref) { | |
735 | _ref = ref->next; | |
736 | jffs2_free_xattr_ref(ref); | |
737 | } | |
738 | ||
739 | for (ref=c->xref_dead_list; ref; ref = _ref) { | |
740 | _ref = ref->next; | |
741 | jffs2_free_xattr_ref(ref); | |
742 | } | |
743 | ||
744 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { | |
745 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { | |
746 | list_del(&xd->xindex); | |
747 | if (xd->xname) | |
748 | kfree(xd->xname); | |
749 | jffs2_free_xattr_datum(xd); | |
750 | } | |
751 | } | |
752 | ||
753 | list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { | |
754 | list_del(&xd->xindex); | |
755 | jffs2_free_xattr_datum(xd); | |
756 | } | |
757 | list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { | |
758 | list_del(&xd->xindex); | |
759 | jffs2_free_xattr_datum(xd); | |
760 | } | |
761 | } | |
762 | ||
763 | #define XREF_TMPHASH_SIZE (128) | |
764 | void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) | |
765 | { | |
766 | struct jffs2_xattr_ref *ref, *_ref; | |
767 | struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; | |
768 | struct jffs2_xattr_datum *xd, *_xd; | |
769 | struct jffs2_inode_cache *ic; | |
770 | struct jffs2_raw_node_ref *raw; | |
771 | int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; | |
772 | int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; | |
773 | ||
774 | BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); | |
775 | ||
776 | /* Phase.1 : Merge same xref */ | |
777 | for (i=0; i < XREF_TMPHASH_SIZE; i++) | |
778 | xref_tmphash[i] = NULL; | |
779 | for (ref=c->xref_temp; ref; ref=_ref) { | |
780 | struct jffs2_xattr_ref *tmp; | |
781 | ||
782 | _ref = ref->next; | |
783 | if (ref_flags(ref->node) != REF_PRISTINE) { | |
784 | if (verify_xattr_ref(c, ref)) { | |
785 | BUG_ON(ref->node->next_in_ino != (void *)ref); | |
786 | ref->node->next_in_ino = NULL; | |
787 | jffs2_mark_node_obsolete(c, ref->node); | |
788 | jffs2_free_xattr_ref(ref); | |
789 | continue; | |
790 | } | |
791 | } | |
792 | ||
793 | i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; | |
794 | for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { | |
795 | if (tmp->ino == ref->ino && tmp->xid == ref->xid) | |
796 | break; | |
797 | } | |
798 | if (tmp) { | |
799 | raw = ref->node; | |
800 | if (ref->xseqno > tmp->xseqno) { | |
801 | tmp->xseqno = ref->xseqno; | |
802 | raw->next_in_ino = tmp->node; | |
803 | tmp->node = raw; | |
804 | } else { | |
805 | raw->next_in_ino = tmp->node->next_in_ino; | |
806 | tmp->node->next_in_ino = raw; | |
807 | } | |
808 | jffs2_free_xattr_ref(ref); | |
809 | continue; | |
810 | } else { | |
811 | ref->next = xref_tmphash[i]; | |
812 | xref_tmphash[i] = ref; | |
813 | } | |
814 | } | |
815 | c->xref_temp = NULL; | |
816 | ||
817 | /* Phase.2 : Bind xref with inode_cache and xattr_datum */ | |
818 | for (i=0; i < XREF_TMPHASH_SIZE; i++) { | |
819 | for (ref=xref_tmphash[i]; ref; ref=_ref) { | |
820 | xref_count++; | |
821 | _ref = ref->next; | |
822 | if (is_xattr_ref_dead(ref)) { | |
823 | ref->next = c->xref_dead_list; | |
824 | c->xref_dead_list = ref; | |
825 | xref_dead_count++; | |
826 | continue; | |
827 | } | |
828 | /* At this point, ref->xid and ref->ino contain XID and inode number. | |
829 | ref->xd and ref->ic are not valid yet. */ | |
830 | xd = jffs2_find_xattr_datum(c, ref->xid); | |
831 | ic = jffs2_get_ino_cache(c, ref->ino); | |
832 | if (!xd || !ic || !ic->pino_nlink) { | |
833 | dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", | |
834 | ref->ino, ref->xid, ref->xseqno); | |
835 | ref->xseqno |= XREF_DELETE_MARKER; | |
836 | ref->next = c->xref_dead_list; | |
837 | c->xref_dead_list = ref; | |
838 | xref_orphan_count++; | |
839 | continue; | |
840 | } | |
841 | ref->xd = xd; | |
842 | ref->ic = ic; | |
843 | atomic_inc(&xd->refcnt); | |
844 | ref->next = ic->xref; | |
845 | ic->xref = ref; | |
846 | } | |
847 | } | |
848 | ||
849 | /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ | |
850 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { | |
851 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { | |
852 | xdatum_count++; | |
853 | list_del_init(&xd->xindex); | |
854 | if (!atomic_read(&xd->refcnt)) { | |
855 | dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", | |
856 | xd->xid, xd->version); | |
857 | xd->flags |= JFFS2_XFLAGS_DEAD; | |
858 | list_add(&xd->xindex, &c->xattr_unchecked); | |
859 | xdatum_orphan_count++; | |
860 | continue; | |
861 | } | |
862 | if (is_xattr_datum_unchecked(c, xd)) { | |
863 | dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", | |
864 | xd->xid, xd->version); | |
865 | list_add(&xd->xindex, &c->xattr_unchecked); | |
866 | xdatum_unchecked_count++; | |
867 | } | |
868 | } | |
869 | } | |
870 | /* build complete */ | |
871 | JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" | |
872 | " (%u unchecked, %u orphan) and " | |
873 | "%u of xref (%u dead, %u orphan) found.\n", | |
874 | xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, | |
875 | xref_count, xref_dead_count, xref_orphan_count); | |
876 | } | |
877 | ||
878 | struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, | |
879 | uint32_t xid, uint32_t version) | |
880 | { | |
881 | struct jffs2_xattr_datum *xd; | |
882 | ||
883 | xd = jffs2_find_xattr_datum(c, xid); | |
884 | if (!xd) { | |
885 | xd = jffs2_alloc_xattr_datum(); | |
886 | if (!xd) | |
887 | return ERR_PTR(-ENOMEM); | |
888 | xd->xid = xid; | |
889 | xd->version = version; | |
890 | if (xd->xid > c->highest_xid) | |
891 | c->highest_xid = xd->xid; | |
892 | list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); | |
893 | } | |
894 | return xd; | |
895 | } | |
896 | ||
897 | /* -------- xattr subsystem functions --------------- | |
898 | * xprefix_to_handler(xprefix) | |
899 | * is used to translate xprefix into xattr_handler. | |
900 | * jffs2_listxattr(dentry, buffer, size) | |
901 | * is an implementation of listxattr handler on jffs2. | |
902 | * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) | |
903 | * is an implementation of getxattr handler on jffs2. | |
904 | * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) | |
905 | * is an implementation of setxattr handler on jffs2. | |
906 | * -------------------------------------------------- */ | |
907 | const struct xattr_handler *jffs2_xattr_handlers[] = { | |
908 | &jffs2_user_xattr_handler, | |
909 | #ifdef CONFIG_JFFS2_FS_SECURITY | |
910 | &jffs2_security_xattr_handler, | |
911 | #endif | |
912 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
913 | &jffs2_acl_access_xattr_handler, | |
914 | &jffs2_acl_default_xattr_handler, | |
915 | #endif | |
916 | &jffs2_trusted_xattr_handler, | |
917 | NULL | |
918 | }; | |
919 | ||
920 | static const struct xattr_handler *xprefix_to_handler(int xprefix) { | |
921 | const struct xattr_handler *ret; | |
922 | ||
923 | switch (xprefix) { | |
924 | case JFFS2_XPREFIX_USER: | |
925 | ret = &jffs2_user_xattr_handler; | |
926 | break; | |
927 | #ifdef CONFIG_JFFS2_FS_SECURITY | |
928 | case JFFS2_XPREFIX_SECURITY: | |
929 | ret = &jffs2_security_xattr_handler; | |
930 | break; | |
931 | #endif | |
932 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
933 | case JFFS2_XPREFIX_ACL_ACCESS: | |
934 | ret = &jffs2_acl_access_xattr_handler; | |
935 | break; | |
936 | case JFFS2_XPREFIX_ACL_DEFAULT: | |
937 | ret = &jffs2_acl_default_xattr_handler; | |
938 | break; | |
939 | #endif | |
940 | case JFFS2_XPREFIX_TRUSTED: | |
941 | ret = &jffs2_trusted_xattr_handler; | |
942 | break; | |
943 | default: | |
944 | ret = NULL; | |
945 | break; | |
946 | } | |
947 | return ret; | |
948 | } | |
949 | ||
950 | ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) | |
951 | { | |
952 | struct inode *inode = dentry->d_inode; | |
953 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
954 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
955 | struct jffs2_inode_cache *ic = f->inocache; | |
956 | struct jffs2_xattr_ref *ref, **pref; | |
957 | struct jffs2_xattr_datum *xd; | |
958 | const struct xattr_handler *xhandle; | |
959 | ssize_t len, rc; | |
960 | int retry = 0; | |
961 | ||
962 | rc = check_xattr_ref_inode(c, ic); | |
963 | if (unlikely(rc)) | |
964 | return rc; | |
965 | ||
966 | down_read(&c->xattr_sem); | |
967 | retry: | |
968 | len = 0; | |
969 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { | |
970 | BUG_ON(ref->ic != ic); | |
971 | xd = ref->xd; | |
972 | if (!xd->xname) { | |
973 | /* xdatum is unchached */ | |
974 | if (!retry) { | |
975 | retry = 1; | |
976 | up_read(&c->xattr_sem); | |
977 | down_write(&c->xattr_sem); | |
978 | goto retry; | |
979 | } else { | |
980 | rc = load_xattr_datum(c, xd); | |
981 | if (unlikely(rc > 0)) { | |
982 | *pref = ref->next; | |
983 | delete_xattr_ref(c, ref); | |
984 | goto retry; | |
985 | } else if (unlikely(rc < 0)) | |
986 | goto out; | |
987 | } | |
988 | } | |
989 | xhandle = xprefix_to_handler(xd->xprefix); | |
990 | if (!xhandle) | |
991 | continue; | |
992 | if (buffer) { | |
993 | rc = xhandle->list(dentry, buffer+len, size-len, | |
994 | xd->xname, xd->name_len, xd->flags); | |
995 | } else { | |
996 | rc = xhandle->list(dentry, NULL, 0, xd->xname, | |
997 | xd->name_len, xd->flags); | |
998 | } | |
999 | if (rc < 0) | |
1000 | goto out; | |
1001 | len += rc; | |
1002 | } | |
1003 | rc = len; | |
1004 | out: | |
1005 | if (!retry) { | |
1006 | up_read(&c->xattr_sem); | |
1007 | } else { | |
1008 | up_write(&c->xattr_sem); | |
1009 | } | |
1010 | return rc; | |
1011 | } | |
1012 | ||
1013 | int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, | |
1014 | char *buffer, size_t size) | |
1015 | { | |
1016 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1017 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
1018 | struct jffs2_inode_cache *ic = f->inocache; | |
1019 | struct jffs2_xattr_datum *xd; | |
1020 | struct jffs2_xattr_ref *ref, **pref; | |
1021 | int rc, retry = 0; | |
1022 | ||
1023 | rc = check_xattr_ref_inode(c, ic); | |
1024 | if (unlikely(rc)) | |
1025 | return rc; | |
1026 | ||
1027 | down_read(&c->xattr_sem); | |
1028 | retry: | |
1029 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { | |
1030 | BUG_ON(ref->ic!=ic); | |
1031 | ||
1032 | xd = ref->xd; | |
1033 | if (xd->xprefix != xprefix) | |
1034 | continue; | |
1035 | if (!xd->xname) { | |
1036 | /* xdatum is unchached */ | |
1037 | if (!retry) { | |
1038 | retry = 1; | |
1039 | up_read(&c->xattr_sem); | |
1040 | down_write(&c->xattr_sem); | |
1041 | goto retry; | |
1042 | } else { | |
1043 | rc = load_xattr_datum(c, xd); | |
1044 | if (unlikely(rc > 0)) { | |
1045 | *pref = ref->next; | |
1046 | delete_xattr_ref(c, ref); | |
1047 | goto retry; | |
1048 | } else if (unlikely(rc < 0)) { | |
1049 | goto out; | |
1050 | } | |
1051 | } | |
1052 | } | |
1053 | if (!strcmp(xname, xd->xname)) { | |
1054 | rc = xd->value_len; | |
1055 | if (buffer) { | |
1056 | if (size < rc) { | |
1057 | rc = -ERANGE; | |
1058 | } else { | |
1059 | memcpy(buffer, xd->xvalue, rc); | |
1060 | } | |
1061 | } | |
1062 | goto out; | |
1063 | } | |
1064 | } | |
1065 | rc = -ENODATA; | |
1066 | out: | |
1067 | if (!retry) { | |
1068 | up_read(&c->xattr_sem); | |
1069 | } else { | |
1070 | up_write(&c->xattr_sem); | |
1071 | } | |
1072 | return rc; | |
1073 | } | |
1074 | ||
1075 | int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, | |
1076 | const char *buffer, size_t size, int flags) | |
1077 | { | |
1078 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1079 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
1080 | struct jffs2_inode_cache *ic = f->inocache; | |
1081 | struct jffs2_xattr_datum *xd; | |
1082 | struct jffs2_xattr_ref *ref, *newref, **pref; | |
1083 | uint32_t length, request; | |
1084 | int rc; | |
1085 | ||
1086 | rc = check_xattr_ref_inode(c, ic); | |
1087 | if (unlikely(rc)) | |
1088 | return rc; | |
1089 | ||
1090 | request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); | |
1091 | rc = jffs2_reserve_space(c, request, &length, | |
1092 | ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); | |
1093 | if (rc) { | |
1094 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); | |
1095 | return rc; | |
1096 | } | |
1097 | ||
1098 | /* Find existing xattr */ | |
1099 | down_write(&c->xattr_sem); | |
1100 | retry: | |
1101 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { | |
1102 | xd = ref->xd; | |
1103 | if (xd->xprefix != xprefix) | |
1104 | continue; | |
1105 | if (!xd->xname) { | |
1106 | rc = load_xattr_datum(c, xd); | |
1107 | if (unlikely(rc > 0)) { | |
1108 | *pref = ref->next; | |
1109 | delete_xattr_ref(c, ref); | |
1110 | goto retry; | |
1111 | } else if (unlikely(rc < 0)) | |
1112 | goto out; | |
1113 | } | |
1114 | if (!strcmp(xd->xname, xname)) { | |
1115 | if (flags & XATTR_CREATE) { | |
1116 | rc = -EEXIST; | |
1117 | goto out; | |
1118 | } | |
1119 | if (!buffer) { | |
1120 | ref->ino = ic->ino; | |
1121 | ref->xid = xd->xid; | |
1122 | ref->xseqno |= XREF_DELETE_MARKER; | |
1123 | rc = save_xattr_ref(c, ref); | |
1124 | if (!rc) { | |
1125 | *pref = ref->next; | |
1126 | spin_lock(&c->erase_completion_lock); | |
1127 | ref->next = c->xref_dead_list; | |
1128 | c->xref_dead_list = ref; | |
1129 | spin_unlock(&c->erase_completion_lock); | |
1130 | unrefer_xattr_datum(c, xd); | |
1131 | } else { | |
1132 | ref->ic = ic; | |
1133 | ref->xd = xd; | |
1134 | ref->xseqno &= ~XREF_DELETE_MARKER; | |
1135 | } | |
1136 | goto out; | |
1137 | } | |
1138 | goto found; | |
1139 | } | |
1140 | } | |
1141 | /* not found */ | |
1142 | if (flags & XATTR_REPLACE) { | |
1143 | rc = -ENODATA; | |
1144 | goto out; | |
1145 | } | |
1146 | if (!buffer) { | |
1147 | rc = -ENODATA; | |
1148 | goto out; | |
1149 | } | |
1150 | found: | |
1151 | xd = create_xattr_datum(c, xprefix, xname, buffer, size); | |
1152 | if (IS_ERR(xd)) { | |
1153 | rc = PTR_ERR(xd); | |
1154 | goto out; | |
1155 | } | |
1156 | up_write(&c->xattr_sem); | |
1157 | jffs2_complete_reservation(c); | |
1158 | ||
1159 | /* create xattr_ref */ | |
1160 | request = PAD(sizeof(struct jffs2_raw_xref)); | |
1161 | rc = jffs2_reserve_space(c, request, &length, | |
1162 | ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); | |
1163 | down_write(&c->xattr_sem); | |
1164 | if (rc) { | |
1165 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); | |
1166 | unrefer_xattr_datum(c, xd); | |
1167 | up_write(&c->xattr_sem); | |
1168 | return rc; | |
1169 | } | |
1170 | if (ref) | |
1171 | *pref = ref->next; | |
1172 | newref = create_xattr_ref(c, ic, xd); | |
1173 | if (IS_ERR(newref)) { | |
1174 | if (ref) { | |
1175 | ref->next = ic->xref; | |
1176 | ic->xref = ref; | |
1177 | } | |
1178 | rc = PTR_ERR(newref); | |
1179 | unrefer_xattr_datum(c, xd); | |
1180 | } else if (ref) { | |
1181 | delete_xattr_ref(c, ref); | |
1182 | } | |
1183 | out: | |
1184 | up_write(&c->xattr_sem); | |
1185 | jffs2_complete_reservation(c); | |
1186 | return rc; | |
1187 | } | |
1188 | ||
1189 | /* -------- garbage collector functions ------------- | |
1190 | * jffs2_garbage_collect_xattr_datum(c, xd, raw) | |
1191 | * is used to move xdatum into new node. | |
1192 | * jffs2_garbage_collect_xattr_ref(c, ref, raw) | |
1193 | * is used to move xref into new node. | |
1194 | * jffs2_verify_xattr(c) | |
1195 | * is used to call do_verify_xattr_datum() before garbage collecting. | |
1196 | * jffs2_release_xattr_datum(c, xd) | |
1197 | * is used to release an in-memory object of xdatum. | |
1198 | * jffs2_release_xattr_ref(c, ref) | |
1199 | * is used to release an in-memory object of xref. | |
1200 | * -------------------------------------------------- */ | |
1201 | int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, | |
1202 | struct jffs2_raw_node_ref *raw) | |
1203 | { | |
1204 | uint32_t totlen, length, old_ofs; | |
1205 | int rc = 0; | |
1206 | ||
1207 | down_write(&c->xattr_sem); | |
1208 | if (xd->node != raw) | |
1209 | goto out; | |
1210 | if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) | |
1211 | goto out; | |
1212 | ||
1213 | rc = load_xattr_datum(c, xd); | |
1214 | if (unlikely(rc)) { | |
1215 | rc = (rc > 0) ? 0 : rc; | |
1216 | goto out; | |
1217 | } | |
1218 | old_ofs = ref_offset(xd->node); | |
1219 | totlen = PAD(sizeof(struct jffs2_raw_xattr) | |
1220 | + xd->name_len + 1 + xd->value_len); | |
1221 | rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); | |
1222 | if (rc) { | |
1223 | JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); | |
1224 | goto out; | |
1225 | } | |
1226 | rc = save_xattr_datum(c, xd); | |
1227 | if (!rc) | |
1228 | dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", | |
1229 | xd->xid, xd->version, old_ofs, ref_offset(xd->node)); | |
1230 | out: | |
1231 | if (!rc) | |
1232 | jffs2_mark_node_obsolete(c, raw); | |
1233 | up_write(&c->xattr_sem); | |
1234 | return rc; | |
1235 | } | |
1236 | ||
1237 | int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, | |
1238 | struct jffs2_raw_node_ref *raw) | |
1239 | { | |
1240 | uint32_t totlen, length, old_ofs; | |
1241 | int rc = 0; | |
1242 | ||
1243 | down_write(&c->xattr_sem); | |
1244 | BUG_ON(!ref->node); | |
1245 | ||
1246 | if (ref->node != raw) | |
1247 | goto out; | |
1248 | if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) | |
1249 | goto out; | |
1250 | ||
1251 | old_ofs = ref_offset(ref->node); | |
1252 | totlen = ref_totlen(c, c->gcblock, ref->node); | |
1253 | ||
1254 | rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); | |
1255 | if (rc) { | |
1256 | JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", | |
1257 | __func__, rc, totlen); | |
1258 | rc = rc ? rc : -EBADFD; | |
1259 | goto out; | |
1260 | } | |
1261 | rc = save_xattr_ref(c, ref); | |
1262 | if (!rc) | |
1263 | dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", | |
1264 | ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); | |
1265 | out: | |
1266 | if (!rc) | |
1267 | jffs2_mark_node_obsolete(c, raw); | |
1268 | up_write(&c->xattr_sem); | |
1269 | return rc; | |
1270 | } | |
1271 | ||
1272 | int jffs2_verify_xattr(struct jffs2_sb_info *c) | |
1273 | { | |
1274 | struct jffs2_xattr_datum *xd, *_xd; | |
1275 | struct jffs2_eraseblock *jeb; | |
1276 | struct jffs2_raw_node_ref *raw; | |
1277 | uint32_t totlen; | |
1278 | int rc; | |
1279 | ||
1280 | down_write(&c->xattr_sem); | |
1281 | list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { | |
1282 | rc = do_verify_xattr_datum(c, xd); | |
1283 | if (rc < 0) | |
1284 | continue; | |
1285 | list_del_init(&xd->xindex); | |
1286 | spin_lock(&c->erase_completion_lock); | |
1287 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { | |
1288 | if (ref_flags(raw) != REF_UNCHECKED) | |
1289 | continue; | |
1290 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; | |
1291 | totlen = PAD(ref_totlen(c, jeb, raw)); | |
1292 | c->unchecked_size -= totlen; c->used_size += totlen; | |
1293 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
1294 | raw->flash_offset = ref_offset(raw) | |
1295 | | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); | |
1296 | } | |
1297 | if (xd->flags & JFFS2_XFLAGS_DEAD) | |
1298 | list_add(&xd->xindex, &c->xattr_dead_list); | |
1299 | spin_unlock(&c->erase_completion_lock); | |
1300 | } | |
1301 | up_write(&c->xattr_sem); | |
1302 | return list_empty(&c->xattr_unchecked) ? 1 : 0; | |
1303 | } | |
1304 | ||
1305 | void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
1306 | { | |
1307 | /* must be called under spin_lock(&c->erase_completion_lock) */ | |
1308 | if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) | |
1309 | return; | |
1310 | ||
1311 | list_del(&xd->xindex); | |
1312 | jffs2_free_xattr_datum(xd); | |
1313 | } | |
1314 | ||
1315 | void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
1316 | { | |
1317 | /* must be called under spin_lock(&c->erase_completion_lock) */ | |
1318 | struct jffs2_xattr_ref *tmp, **ptmp; | |
1319 | ||
1320 | if (ref->node != (void *)ref) | |
1321 | return; | |
1322 | ||
1323 | for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { | |
1324 | if (ref == tmp) { | |
1325 | *ptmp = tmp->next; | |
1326 | break; | |
1327 | } | |
1328 | } | |
1329 | jffs2_free_xattr_ref(ref); | |
1330 | } |