Commit | Line | Data |
---|---|---|
652ecc20 KK |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
aa98d7cf | 3 | * |
c00c310e | 4 | * Copyright © 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 | */ | |
c00c310e | 11 | |
9bbf29e4 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
aa98d7cf KK |
14 | #include <linux/kernel.h> |
15 | #include <linux/slab.h> | |
16 | #include <linux/fs.h> | |
17 | #include <linux/time.h> | |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/highmem.h> | |
20 | #include <linux/crc32.h> | |
21 | #include <linux/jffs2.h> | |
22 | #include <linux/xattr.h> | |
23 | #include <linux/mtd/mtd.h> | |
24 | #include "nodelist.h" | |
25 | /* -------- xdatum related functions ---------------- | |
26 | * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) | |
27 | * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is | |
28 | * the index of the xattr name/value pair cache (c->xattrindex). | |
c9f700f8 KK |
29 | * is_xattr_datum_unchecked(c, xd) |
30 | * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not | |
31 | * unchecked, it returns 0. | |
aa98d7cf KK |
32 | * unload_xattr_datum(c, xd) |
33 | * is used to release xattr name/value pair and detach from c->xattrindex. | |
34 | * reclaim_xattr_datum(c) | |
35 | * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when | |
bea93128 | 36 | * memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold |
aa98d7cf | 37 | * is hard coded as 32KiB. |
aa98d7cf KK |
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 | 55 | * is used to create new xdatum and write to medium. |
c6e8c6cc KK |
56 | * unrefer_xattr_datum(c, xd) |
57 | * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD | |
58 | * is set on xd->flags and chained xattr_dead_list or release it immediately. | |
59 | * In the first case, the garbage collector release it later. | |
aa98d7cf | 60 | * -------------------------------------------------- */ |
aa98d7cf KK |
61 | static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) |
62 | { | |
63 | int name_len = strlen(xname); | |
64 | ||
65 | return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); | |
66 | } | |
67 | ||
c9f700f8 KK |
68 | static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
69 | { | |
70 | struct jffs2_raw_node_ref *raw; | |
71 | int rc = 0; | |
72 | ||
73 | spin_lock(&c->erase_completion_lock); | |
74 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { | |
75 | if (ref_flags(raw) == REF_UNCHECKED) { | |
76 | rc = 1; | |
77 | break; | |
78 | } | |
79 | } | |
80 | spin_unlock(&c->erase_completion_lock); | |
81 | return rc; | |
82 | } | |
83 | ||
aa98d7cf KK |
84 | static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
85 | { | |
86 | /* must be called under down_write(xattr_sem) */ | |
8e24eea7 | 87 | D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); |
aa98d7cf KK |
88 | if (xd->xname) { |
89 | c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); | |
90 | kfree(xd->xname); | |
91 | } | |
92 | ||
93 | list_del_init(&xd->xindex); | |
94 | xd->hashkey = 0; | |
95 | xd->xname = NULL; | |
96 | xd->xvalue = NULL; | |
97 | } | |
98 | ||
99 | static void reclaim_xattr_datum(struct jffs2_sb_info *c) | |
100 | { | |
101 | /* must be called under down_write(xattr_sem) */ | |
102 | struct jffs2_xattr_datum *xd, *_xd; | |
103 | uint32_t target, before; | |
104 | static int index = 0; | |
105 | int count; | |
106 | ||
107 | if (c->xdatum_mem_threshold > c->xdatum_mem_usage) | |
108 | return; | |
109 | ||
110 | before = c->xdatum_mem_usage; | |
111 | target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ | |
112 | for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { | |
113 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { | |
114 | if (xd->flags & JFFS2_XFLAGS_HOT) { | |
115 | xd->flags &= ~JFFS2_XFLAGS_HOT; | |
116 | } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { | |
117 | unload_xattr_datum(c, xd); | |
118 | } | |
119 | if (c->xdatum_mem_usage <= target) | |
120 | goto out; | |
121 | } | |
122 | index = (index+1) % XATTRINDEX_HASHSIZE; | |
123 | } | |
124 | out: | |
125 | JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", | |
126 | before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); | |
127 | } | |
128 | ||
aa98d7cf KK |
129 | static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
130 | { | |
131 | /* must be called under down_write(xattr_sem) */ | |
132 | struct jffs2_eraseblock *jeb; | |
c9f700f8 | 133 | struct jffs2_raw_node_ref *raw; |
aa98d7cf KK |
134 | struct jffs2_raw_xattr rx; |
135 | size_t readlen; | |
c9f700f8 | 136 | uint32_t crc, offset, totlen; |
aa98d7cf KK |
137 | int rc; |
138 | ||
c9f700f8 KK |
139 | spin_lock(&c->erase_completion_lock); |
140 | offset = ref_offset(xd->node); | |
141 | if (ref_flags(xd->node) == REF_PRISTINE) | |
142 | goto complete; | |
143 | spin_unlock(&c->erase_completion_lock); | |
aa98d7cf | 144 | |
c9f700f8 | 145 | rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); |
aa98d7cf | 146 | if (rc || readlen != sizeof(rx)) { |
89291a9d | 147 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", |
c9f700f8 | 148 | rc, sizeof(rx), readlen, offset); |
aa98d7cf KK |
149 | return rc ? rc : -EIO; |
150 | } | |
151 | crc = crc32(0, &rx, sizeof(rx) - 4); | |
152 | if (crc != je32_to_cpu(rx.node_crc)) { | |
c9f700f8 KK |
153 | JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
154 | offset, je32_to_cpu(rx.hdr_crc), crc); | |
155 | xd->flags |= JFFS2_XFLAGS_INVALID; | |
f326966b | 156 | return -EIO; |
aa98d7cf | 157 | } |
8a13695c | 158 | totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); |
aa98d7cf KK |
159 | if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK |
160 | || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR | |
161 | || je32_to_cpu(rx.totlen) != totlen | |
162 | || je32_to_cpu(rx.xid) != xd->xid | |
163 | || je32_to_cpu(rx.version) != xd->version) { | |
164 | JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " | |
165 | "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", | |
c9f700f8 | 166 | offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, |
aa98d7cf KK |
167 | je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, |
168 | je32_to_cpu(rx.totlen), totlen, | |
169 | je32_to_cpu(rx.xid), xd->xid, | |
170 | je32_to_cpu(rx.version), xd->version); | |
c9f700f8 | 171 | xd->flags |= JFFS2_XFLAGS_INVALID; |
f326966b | 172 | return -EIO; |
aa98d7cf KK |
173 | } |
174 | xd->xprefix = rx.xprefix; | |
175 | xd->name_len = rx.name_len; | |
176 | xd->value_len = je16_to_cpu(rx.value_len); | |
177 | xd->data_crc = je32_to_cpu(rx.data_crc); | |
178 | ||
aa98d7cf | 179 | spin_lock(&c->erase_completion_lock); |
c9f700f8 KK |
180 | complete: |
181 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { | |
182 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; | |
183 | totlen = PAD(ref_totlen(c, jeb, raw)); | |
184 | if (ref_flags(raw) == REF_UNCHECKED) { | |
185 | c->unchecked_size -= totlen; c->used_size += totlen; | |
186 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
187 | } | |
188 | raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); | |
189 | } | |
aa98d7cf KK |
190 | spin_unlock(&c->erase_completion_lock); |
191 | ||
192 | /* unchecked xdatum is chained with c->xattr_unchecked */ | |
193 | list_del_init(&xd->xindex); | |
194 | ||
195 | dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n", | |
196 | xd->xid, xd->version); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
202 | { | |
203 | /* must be called under down_write(xattr_sem) */ | |
204 | char *data; | |
205 | size_t readlen; | |
206 | uint32_t crc, length; | |
207 | int i, ret, retry = 0; | |
208 | ||
aa98d7cf KK |
209 | BUG_ON(ref_flags(xd->node) != REF_PRISTINE); |
210 | BUG_ON(!list_empty(&xd->xindex)); | |
211 | retry: | |
212 | length = xd->name_len + 1 + xd->value_len; | |
213 | data = kmalloc(length, GFP_KERNEL); | |
214 | if (!data) | |
215 | return -ENOMEM; | |
216 | ||
217 | ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), | |
218 | length, &readlen, data); | |
219 | ||
220 | if (ret || length!=readlen) { | |
89291a9d | 221 | JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", |
aa98d7cf KK |
222 | ret, length, readlen, ref_offset(xd->node)); |
223 | kfree(data); | |
224 | return ret ? ret : -EIO; | |
225 | } | |
226 | ||
227 | data[xd->name_len] = '\0'; | |
228 | crc = crc32(0, data, length); | |
229 | if (crc != xd->data_crc) { | |
230 | JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)" | |
231 | " at %#08x, read: 0x%08x calculated: 0x%08x\n", | |
232 | ref_offset(xd->node), xd->data_crc, crc); | |
233 | kfree(data); | |
c9f700f8 | 234 | xd->flags |= JFFS2_XFLAGS_INVALID; |
f326966b | 235 | return -EIO; |
aa98d7cf KK |
236 | } |
237 | ||
238 | xd->flags |= JFFS2_XFLAGS_HOT; | |
239 | xd->xname = data; | |
240 | xd->xvalue = data + xd->name_len+1; | |
241 | ||
242 | c->xdatum_mem_usage += length; | |
243 | ||
244 | xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); | |
245 | i = xd->hashkey % XATTRINDEX_HASHSIZE; | |
246 | list_add(&xd->xindex, &c->xattrindex[i]); | |
247 | if (!retry) { | |
248 | retry = 1; | |
249 | reclaim_xattr_datum(c); | |
250 | if (!xd->xname) | |
251 | goto retry; | |
252 | } | |
253 | ||
254 | dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", | |
255 | xd->xid, xd->xprefix, xd->xname); | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
261 | { | |
262 | /* must be called under down_write(xattr_sem); | |
263 | * rc < 0 : recoverable error, try again | |
264 | * rc = 0 : success | |
265 | * rc > 0 : Unrecoverable error, this node should be deleted. | |
266 | */ | |
267 | int rc = 0; | |
c9f700f8 | 268 | |
8a13695c | 269 | BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); |
c9f700f8 KK |
270 | if (xd->xname) |
271 | return 0; | |
272 | if (xd->flags & JFFS2_XFLAGS_INVALID) | |
f326966b | 273 | return -EIO; |
c9f700f8 | 274 | if (unlikely(is_xattr_datum_unchecked(c, xd))) |
aa98d7cf | 275 | rc = do_verify_xattr_datum(c, xd); |
aa98d7cf KK |
276 | if (!rc) |
277 | rc = do_load_xattr_datum(c, xd); | |
278 | return rc; | |
279 | } | |
280 | ||
9fe4854c | 281 | static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
aa98d7cf KK |
282 | { |
283 | /* must be called under down_write(xattr_sem) */ | |
2f785402 | 284 | struct jffs2_raw_xattr rx; |
aa98d7cf | 285 | struct kvec vecs[2]; |
89291a9d | 286 | size_t length; |
8a13695c | 287 | int rc, totlen; |
9fe4854c | 288 | uint32_t phys_ofs = write_ofs(c); |
aa98d7cf | 289 | |
8a13695c KK |
290 | BUG_ON(!xd->xname); |
291 | BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); | |
aa98d7cf KK |
292 | |
293 | vecs[0].iov_base = ℞ | |
8a13695c KK |
294 | vecs[0].iov_len = sizeof(rx); |
295 | vecs[1].iov_base = xd->xname; | |
296 | vecs[1].iov_len = xd->name_len + 1 + xd->value_len; | |
297 | totlen = vecs[0].iov_len + vecs[1].iov_len; | |
298 | ||
aa98d7cf | 299 | /* Setup raw-xattr */ |
c9f700f8 | 300 | memset(&rx, 0, sizeof(rx)); |
aa98d7cf KK |
301 | rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
302 | rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); | |
303 | rx.totlen = cpu_to_je32(PAD(totlen)); | |
304 | rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); | |
305 | ||
306 | rx.xid = cpu_to_je32(xd->xid); | |
8a13695c KK |
307 | rx.version = cpu_to_je32(++xd->version); |
308 | rx.xprefix = xd->xprefix; | |
309 | rx.name_len = xd->name_len; | |
310 | rx.value_len = cpu_to_je16(xd->value_len); | |
311 | rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); | |
aa98d7cf KK |
312 | rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); |
313 | ||
8a13695c | 314 | rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); |
aa98d7cf | 315 | if (rc || totlen != length) { |
89291a9d | 316 | JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", |
aa98d7cf KK |
317 | rc, totlen, length, phys_ofs); |
318 | rc = rc ? rc : -EIO; | |
2f785402 DW |
319 | if (length) |
320 | jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); | |
321 | ||
aa98d7cf KK |
322 | return rc; |
323 | } | |
aa98d7cf | 324 | /* success */ |
c9f700f8 | 325 | jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); |
aa98d7cf KK |
326 | |
327 | dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", | |
328 | xd->xid, xd->version, xd->xprefix, xd->xname); | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, | |
334 | int xprefix, const char *xname, | |
9fe4854c | 335 | const char *xvalue, int xsize) |
aa98d7cf KK |
336 | { |
337 | /* must be called under down_write(xattr_sem) */ | |
338 | struct jffs2_xattr_datum *xd; | |
339 | uint32_t hashkey, name_len; | |
340 | char *data; | |
341 | int i, rc; | |
342 | ||
343 | /* Search xattr_datum has same xname/xvalue by index */ | |
344 | hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); | |
345 | i = hashkey % XATTRINDEX_HASHSIZE; | |
346 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { | |
347 | if (xd->hashkey==hashkey | |
348 | && xd->xprefix==xprefix | |
349 | && xd->value_len==xsize | |
350 | && !strcmp(xd->xname, xname) | |
351 | && !memcmp(xd->xvalue, xvalue, xsize)) { | |
2c887e23 | 352 | atomic_inc(&xd->refcnt); |
aa98d7cf KK |
353 | return xd; |
354 | } | |
355 | } | |
356 | ||
357 | /* Not found, Create NEW XATTR-Cache */ | |
358 | name_len = strlen(xname); | |
359 | ||
360 | xd = jffs2_alloc_xattr_datum(); | |
361 | if (!xd) | |
362 | return ERR_PTR(-ENOMEM); | |
363 | ||
364 | data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); | |
365 | if (!data) { | |
366 | jffs2_free_xattr_datum(xd); | |
367 | return ERR_PTR(-ENOMEM); | |
368 | } | |
369 | strcpy(data, xname); | |
370 | memcpy(data + name_len + 1, xvalue, xsize); | |
371 | ||
2c887e23 | 372 | atomic_set(&xd->refcnt, 1); |
aa98d7cf KK |
373 | xd->xid = ++c->highest_xid; |
374 | xd->flags |= JFFS2_XFLAGS_HOT; | |
375 | xd->xprefix = xprefix; | |
376 | ||
377 | xd->hashkey = hashkey; | |
378 | xd->xname = data; | |
379 | xd->xvalue = data + name_len + 1; | |
380 | xd->name_len = name_len; | |
381 | xd->value_len = xsize; | |
382 | xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); | |
383 | ||
9fe4854c | 384 | rc = save_xattr_datum(c, xd); |
aa98d7cf KK |
385 | if (rc) { |
386 | kfree(xd->xname); | |
387 | jffs2_free_xattr_datum(xd); | |
388 | return ERR_PTR(rc); | |
389 | } | |
390 | ||
391 | /* Insert Hash Index */ | |
392 | i = hashkey % XATTRINDEX_HASHSIZE; | |
393 | list_add(&xd->xindex, &c->xattrindex[i]); | |
394 | ||
395 | c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); | |
396 | reclaim_xattr_datum(c); | |
397 | ||
398 | return xd; | |
399 | } | |
400 | ||
c6e8c6cc | 401 | static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
c9f700f8 KK |
402 | { |
403 | /* must be called under down_write(xattr_sem) */ | |
c6e8c6cc | 404 | if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { |
c6e8c6cc KK |
405 | unload_xattr_datum(c, xd); |
406 | xd->flags |= JFFS2_XFLAGS_DEAD; | |
407 | if (xd->node == (void *)xd) { | |
408 | BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); | |
409 | jffs2_free_xattr_datum(xd); | |
410 | } else { | |
411 | list_add(&xd->xindex, &c->xattr_dead_list); | |
412 | } | |
413 | spin_unlock(&c->erase_completion_lock); | |
414 | ||
a6b1d82d JG |
415 | dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", |
416 | xd->xid, xd->version); | |
c9f700f8 | 417 | } |
c9f700f8 KK |
418 | } |
419 | ||
21b9879b | 420 | /* -------- xref related functions ------------------ |
aa98d7cf KK |
421 | * verify_xattr_ref(c, ref) |
422 | * is used to load xref information from medium. Because summary data does not | |
423 | * contain xid/ino, it's necessary to verify once while mounting process. | |
9fe4854c | 424 | * save_xattr_ref(c, ref) |
8a13695c KK |
425 | * is used to write xref to medium. If delete marker is marked, it write |
426 | * a delete marker of xref into medium. | |
9fe4854c | 427 | * create_xattr_ref(c, ic, xd) |
aa98d7cf | 428 | * is used to create a new xref and write to medium. |
8a13695c KK |
429 | * delete_xattr_ref(c, ref) |
430 | * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, | |
431 | * and allows GC to reclaim those physical nodes. | |
aa98d7cf KK |
432 | * jffs2_xattr_delete_inode(c, ic) |
433 | * is called to remove xrefs related to obsolete inode when inode is unlinked. | |
434 | * jffs2_xattr_free_inode(c, ic) | |
435 | * is called to release xattr related objects when unmounting. | |
8f2b6f49 | 436 | * check_xattr_ref_inode(c, ic) |
aa98d7cf KK |
437 | * is used to confirm inode does not have duplicate xattr name/value pair. |
438 | * -------------------------------------------------- */ | |
439 | static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
440 | { | |
441 | struct jffs2_eraseblock *jeb; | |
c9f700f8 | 442 | struct jffs2_raw_node_ref *raw; |
aa98d7cf KK |
443 | struct jffs2_raw_xref rr; |
444 | size_t readlen; | |
c9f700f8 | 445 | uint32_t crc, offset, totlen; |
aa98d7cf KK |
446 | int rc; |
447 | ||
c9f700f8 KK |
448 | spin_lock(&c->erase_completion_lock); |
449 | if (ref_flags(ref->node) != REF_UNCHECKED) | |
450 | goto complete; | |
451 | offset = ref_offset(ref->node); | |
452 | spin_unlock(&c->erase_completion_lock); | |
aa98d7cf | 453 | |
c9f700f8 | 454 | rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); |
aa98d7cf | 455 | if (rc || sizeof(rr) != readlen) { |
89291a9d | 456 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", |
c9f700f8 | 457 | rc, sizeof(rr), readlen, offset); |
aa98d7cf KK |
458 | return rc ? rc : -EIO; |
459 | } | |
460 | /* obsolete node */ | |
461 | crc = crc32(0, &rr, sizeof(rr) - 4); | |
462 | if (crc != je32_to_cpu(rr.node_crc)) { | |
c9f700f8 KK |
463 | JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
464 | offset, je32_to_cpu(rr.node_crc), crc); | |
f326966b | 465 | return -EIO; |
aa98d7cf KK |
466 | } |
467 | if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK | |
468 | || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF | |
469 | || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { | |
470 | JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " | |
89291a9d | 471 | "nodetype=%#04x/%#04x, totlen=%u/%zu\n", |
c9f700f8 | 472 | offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, |
aa98d7cf KK |
473 | je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, |
474 | je32_to_cpu(rr.totlen), PAD(sizeof(rr))); | |
f326966b | 475 | return -EIO; |
aa98d7cf KK |
476 | } |
477 | ref->ino = je32_to_cpu(rr.ino); | |
478 | ref->xid = je32_to_cpu(rr.xid); | |
c9f700f8 KK |
479 | ref->xseqno = je32_to_cpu(rr.xseqno); |
480 | if (ref->xseqno > c->highest_xseqno) | |
481 | c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); | |
aa98d7cf KK |
482 | |
483 | spin_lock(&c->erase_completion_lock); | |
c9f700f8 KK |
484 | complete: |
485 | for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { | |
486 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; | |
487 | totlen = PAD(ref_totlen(c, jeb, raw)); | |
488 | if (ref_flags(raw) == REF_UNCHECKED) { | |
489 | c->unchecked_size -= totlen; c->used_size += totlen; | |
490 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
491 | } | |
492 | raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); | |
493 | } | |
aa98d7cf KK |
494 | spin_unlock(&c->erase_completion_lock); |
495 | ||
496 | dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", | |
497 | ref->ino, ref->xid, ref_offset(ref->node)); | |
498 | return 0; | |
499 | } | |
500 | ||
9fe4854c | 501 | static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
aa98d7cf KK |
502 | { |
503 | /* must be called under down_write(xattr_sem) */ | |
aa98d7cf | 504 | struct jffs2_raw_xref rr; |
89291a9d | 505 | size_t length; |
c9f700f8 | 506 | uint32_t xseqno, phys_ofs = write_ofs(c); |
aa98d7cf KK |
507 | int ret; |
508 | ||
aa98d7cf KK |
509 | rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
510 | rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); | |
511 | rr.totlen = cpu_to_je32(PAD(sizeof(rr))); | |
512 | rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); | |
513 | ||
c9f700f8 KK |
514 | xseqno = (c->highest_xseqno += 2); |
515 | if (is_xattr_ref_dead(ref)) { | |
516 | xseqno |= XREF_DELETE_MARKER; | |
517 | rr.ino = cpu_to_je32(ref->ino); | |
518 | rr.xid = cpu_to_je32(ref->xid); | |
519 | } else { | |
520 | rr.ino = cpu_to_je32(ref->ic->ino); | |
521 | rr.xid = cpu_to_je32(ref->xd->xid); | |
522 | } | |
523 | rr.xseqno = cpu_to_je32(xseqno); | |
aa98d7cf KK |
524 | rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); |
525 | ||
526 | ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); | |
527 | if (ret || sizeof(rr) != length) { | |
89291a9d | 528 | JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", |
aa98d7cf KK |
529 | ret, sizeof(rr), length, phys_ofs); |
530 | ret = ret ? ret : -EIO; | |
2f785402 DW |
531 | if (length) |
532 | jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); | |
533 | ||
aa98d7cf KK |
534 | return ret; |
535 | } | |
c9f700f8 KK |
536 | /* success */ |
537 | ref->xseqno = xseqno; | |
538 | jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); | |
aa98d7cf KK |
539 | |
540 | dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, | |
9fe4854c | 546 | struct jffs2_xattr_datum *xd) |
aa98d7cf KK |
547 | { |
548 | /* must be called under down_write(xattr_sem) */ | |
549 | struct jffs2_xattr_ref *ref; | |
550 | int ret; | |
551 | ||
552 | ref = jffs2_alloc_xattr_ref(); | |
553 | if (!ref) | |
554 | return ERR_PTR(-ENOMEM); | |
555 | ref->ic = ic; | |
556 | ref->xd = xd; | |
557 | ||
9fe4854c | 558 | ret = save_xattr_ref(c, ref); |
aa98d7cf KK |
559 | if (ret) { |
560 | jffs2_free_xattr_ref(ref); | |
561 | return ERR_PTR(ret); | |
562 | } | |
563 | ||
564 | /* Chain to inode */ | |
8f2b6f49 KK |
565 | ref->next = ic->xref; |
566 | ic->xref = ref; | |
aa98d7cf KK |
567 | |
568 | return ref; /* success */ | |
569 | } | |
570 | ||
8a13695c | 571 | static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
c9f700f8 KK |
572 | { |
573 | /* must be called under down_write(xattr_sem) */ | |
574 | struct jffs2_xattr_datum *xd; | |
575 | ||
c9f700f8 | 576 | xd = ref->xd; |
8a13695c | 577 | ref->xseqno |= XREF_DELETE_MARKER; |
c9f700f8 KK |
578 | ref->ino = ref->ic->ino; |
579 | ref->xid = ref->xd->xid; | |
580 | spin_lock(&c->erase_completion_lock); | |
581 | ref->next = c->xref_dead_list; | |
582 | c->xref_dead_list = ref; | |
583 | spin_unlock(&c->erase_completion_lock); | |
584 | ||
8a13695c KK |
585 | dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", |
586 | ref->ino, ref->xid, ref->xseqno); | |
c9f700f8 | 587 | |
c6e8c6cc | 588 | unrefer_xattr_datum(c, xd); |
c9f700f8 KK |
589 | } |
590 | ||
aa98d7cf KK |
591 | void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
592 | { | |
b57922d9 | 593 | /* It's called from jffs2_evict_inode() on inode removing. |
aa98d7cf | 594 | When an inode with XATTR is removed, those XATTRs must be removed. */ |
8a13695c | 595 | struct jffs2_xattr_ref *ref, *_ref; |
aa98d7cf | 596 | |
27c72b04 | 597 | if (!ic || ic->pino_nlink > 0) |
aa98d7cf KK |
598 | return; |
599 | ||
600 | down_write(&c->xattr_sem); | |
8a13695c KK |
601 | for (ref = ic->xref; ref; ref = _ref) { |
602 | _ref = ref->next; | |
603 | delete_xattr_ref(c, ref); | |
8f2b6f49 | 604 | } |
8a13695c | 605 | ic->xref = NULL; |
aa98d7cf KK |
606 | up_write(&c->xattr_sem); |
607 | } | |
608 | ||
609 | void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) | |
610 | { | |
611 | /* It's called from jffs2_free_ino_caches() until unmounting FS. */ | |
612 | struct jffs2_xattr_datum *xd; | |
613 | struct jffs2_xattr_ref *ref, *_ref; | |
614 | ||
615 | down_write(&c->xattr_sem); | |
8f2b6f49 KK |
616 | for (ref = ic->xref; ref; ref = _ref) { |
617 | _ref = ref->next; | |
aa98d7cf | 618 | xd = ref->xd; |
2c887e23 | 619 | if (atomic_dec_and_test(&xd->refcnt)) { |
aa98d7cf KK |
620 | unload_xattr_datum(c, xd); |
621 | jffs2_free_xattr_datum(xd); | |
622 | } | |
623 | jffs2_free_xattr_ref(ref); | |
624 | } | |
8f2b6f49 | 625 | ic->xref = NULL; |
aa98d7cf KK |
626 | up_write(&c->xattr_sem); |
627 | } | |
628 | ||
8f2b6f49 | 629 | static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
aa98d7cf | 630 | { |
a4ce96ac | 631 | /* success of check_xattr_ref_inode() means that inode (ic) dose not have |
aa98d7cf KK |
632 | * duplicate name/value pairs. If duplicate name/value pair would be found, |
633 | * one will be removed. | |
634 | */ | |
c9f700f8 | 635 | struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; |
aa98d7cf KK |
636 | int rc = 0; |
637 | ||
638 | if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) | |
639 | return 0; | |
640 | down_write(&c->xattr_sem); | |
641 | retry: | |
642 | rc = 0; | |
8f2b6f49 | 643 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
644 | if (!ref->xd->xname) { |
645 | rc = load_xattr_datum(c, ref->xd); | |
646 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 647 | *pref = ref->next; |
8a13695c | 648 | delete_xattr_ref(c, ref); |
aa98d7cf KK |
649 | goto retry; |
650 | } else if (unlikely(rc < 0)) | |
651 | goto out; | |
652 | } | |
c9f700f8 | 653 | for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { |
aa98d7cf KK |
654 | if (!cmp->xd->xname) { |
655 | ref->xd->flags |= JFFS2_XFLAGS_BIND; | |
656 | rc = load_xattr_datum(c, cmp->xd); | |
657 | ref->xd->flags &= ~JFFS2_XFLAGS_BIND; | |
658 | if (unlikely(rc > 0)) { | |
c9f700f8 | 659 | *pcmp = cmp->next; |
8a13695c | 660 | delete_xattr_ref(c, cmp); |
aa98d7cf KK |
661 | goto retry; |
662 | } else if (unlikely(rc < 0)) | |
663 | goto out; | |
664 | } | |
665 | if (ref->xd->xprefix == cmp->xd->xprefix | |
666 | && !strcmp(ref->xd->xname, cmp->xd->xname)) { | |
c9f700f8 KK |
667 | if (ref->xseqno > cmp->xseqno) { |
668 | *pcmp = cmp->next; | |
8a13695c | 669 | delete_xattr_ref(c, cmp); |
c9f700f8 KK |
670 | } else { |
671 | *pref = ref->next; | |
8a13695c | 672 | delete_xattr_ref(c, ref); |
c9f700f8 | 673 | } |
aa98d7cf KK |
674 | goto retry; |
675 | } | |
676 | } | |
677 | } | |
678 | ic->flags |= INO_FLAGS_XATTR_CHECKED; | |
679 | out: | |
680 | up_write(&c->xattr_sem); | |
681 | ||
682 | return rc; | |
683 | } | |
684 | ||
685 | /* -------- xattr subsystem functions --------------- | |
686 | * jffs2_init_xattr_subsystem(c) | |
687 | * is used to initialize semaphore and list_head, and some variables. | |
688 | * jffs2_find_xattr_datum(c, xid) | |
689 | * is used to lookup xdatum while scanning process. | |
690 | * jffs2_clear_xattr_subsystem(c) | |
691 | * is used to release any xattr related objects. | |
692 | * jffs2_build_xattr_subsystem(c) | |
693 | * is used to associate xdatum and xref while super block building process. | |
694 | * jffs2_setup_xattr_datum(c, xid, version) | |
695 | * is used to insert xdatum while scanning process. | |
696 | * -------------------------------------------------- */ | |
697 | void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) | |
698 | { | |
699 | int i; | |
700 | ||
701 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) | |
702 | INIT_LIST_HEAD(&c->xattrindex[i]); | |
aa98d7cf | 703 | INIT_LIST_HEAD(&c->xattr_unchecked); |
c9f700f8 KK |
704 | INIT_LIST_HEAD(&c->xattr_dead_list); |
705 | c->xref_dead_list = NULL; | |
8f2b6f49 | 706 | c->xref_temp = NULL; |
aa98d7cf KK |
707 | |
708 | init_rwsem(&c->xattr_sem); | |
c9f700f8 KK |
709 | c->highest_xid = 0; |
710 | c->highest_xseqno = 0; | |
aa98d7cf KK |
711 | c->xdatum_mem_usage = 0; |
712 | c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ | |
713 | } | |
714 | ||
715 | static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) | |
716 | { | |
717 | struct jffs2_xattr_datum *xd; | |
718 | int i = xid % XATTRINDEX_HASHSIZE; | |
719 | ||
720 | /* It's only used in scanning/building process. */ | |
721 | BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); | |
722 | ||
723 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { | |
724 | if (xd->xid==xid) | |
725 | return xd; | |
726 | } | |
727 | return NULL; | |
728 | } | |
729 | ||
730 | void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) | |
731 | { | |
732 | struct jffs2_xattr_datum *xd, *_xd; | |
733 | struct jffs2_xattr_ref *ref, *_ref; | |
734 | int i; | |
735 | ||
8f2b6f49 KK |
736 | for (ref=c->xref_temp; ref; ref = _ref) { |
737 | _ref = ref->next; | |
aa98d7cf | 738 | jffs2_free_xattr_ref(ref); |
8f2b6f49 | 739 | } |
c9f700f8 KK |
740 | |
741 | for (ref=c->xref_dead_list; ref; ref = _ref) { | |
742 | _ref = ref->next; | |
743 | jffs2_free_xattr_ref(ref); | |
744 | } | |
aa98d7cf KK |
745 | |
746 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { | |
747 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { | |
748 | list_del(&xd->xindex); | |
749 | if (xd->xname) | |
750 | kfree(xd->xname); | |
751 | jffs2_free_xattr_datum(xd); | |
752 | } | |
753 | } | |
c9f700f8 KK |
754 | |
755 | list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { | |
756 | list_del(&xd->xindex); | |
757 | jffs2_free_xattr_datum(xd); | |
758 | } | |
2ad8ee71 DW |
759 | list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { |
760 | list_del(&xd->xindex); | |
761 | jffs2_free_xattr_datum(xd); | |
762 | } | |
aa98d7cf KK |
763 | } |
764 | ||
c9f700f8 | 765 | #define XREF_TMPHASH_SIZE (128) |
aa98d7cf KK |
766 | void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) |
767 | { | |
768 | struct jffs2_xattr_ref *ref, *_ref; | |
c9f700f8 | 769 | struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; |
aa98d7cf KK |
770 | struct jffs2_xattr_datum *xd, *_xd; |
771 | struct jffs2_inode_cache *ic; | |
c9f700f8 KK |
772 | struct jffs2_raw_node_ref *raw; |
773 | int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; | |
8a13695c | 774 | int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; |
aa98d7cf KK |
775 | |
776 | BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); | |
777 | ||
8a13695c | 778 | /* Phase.1 : Merge same xref */ |
c9f700f8 KK |
779 | for (i=0; i < XREF_TMPHASH_SIZE; i++) |
780 | xref_tmphash[i] = NULL; | |
8f2b6f49 | 781 | for (ref=c->xref_temp; ref; ref=_ref) { |
c9f700f8 KK |
782 | struct jffs2_xattr_ref *tmp; |
783 | ||
8f2b6f49 | 784 | _ref = ref->next; |
aa98d7cf KK |
785 | if (ref_flags(ref->node) != REF_PRISTINE) { |
786 | if (verify_xattr_ref(c, ref)) { | |
c9f700f8 KK |
787 | BUG_ON(ref->node->next_in_ino != (void *)ref); |
788 | ref->node->next_in_ino = NULL; | |
789 | jffs2_mark_node_obsolete(c, ref->node); | |
aa98d7cf KK |
790 | jffs2_free_xattr_ref(ref); |
791 | continue; | |
792 | } | |
793 | } | |
c9f700f8 KK |
794 | |
795 | i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; | |
796 | for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { | |
797 | if (tmp->ino == ref->ino && tmp->xid == ref->xid) | |
798 | break; | |
799 | } | |
800 | if (tmp) { | |
801 | raw = ref->node; | |
802 | if (ref->xseqno > tmp->xseqno) { | |
803 | tmp->xseqno = ref->xseqno; | |
804 | raw->next_in_ino = tmp->node; | |
805 | tmp->node = raw; | |
806 | } else { | |
807 | raw->next_in_ino = tmp->node->next_in_ino; | |
808 | tmp->node->next_in_ino = raw; | |
809 | } | |
aa98d7cf KK |
810 | jffs2_free_xattr_ref(ref); |
811 | continue; | |
c9f700f8 KK |
812 | } else { |
813 | ref->next = xref_tmphash[i]; | |
814 | xref_tmphash[i] = ref; | |
aa98d7cf | 815 | } |
aa98d7cf | 816 | } |
8f2b6f49 | 817 | c->xref_temp = NULL; |
aa98d7cf | 818 | |
8a13695c | 819 | /* Phase.2 : Bind xref with inode_cache and xattr_datum */ |
c9f700f8 KK |
820 | for (i=0; i < XREF_TMPHASH_SIZE; i++) { |
821 | for (ref=xref_tmphash[i]; ref; ref=_ref) { | |
8a13695c | 822 | xref_count++; |
c9f700f8 KK |
823 | _ref = ref->next; |
824 | if (is_xattr_ref_dead(ref)) { | |
825 | ref->next = c->xref_dead_list; | |
826 | c->xref_dead_list = ref; | |
8a13695c | 827 | xref_dead_count++; |
c9f700f8 KK |
828 | continue; |
829 | } | |
830 | /* At this point, ref->xid and ref->ino contain XID and inode number. | |
831 | ref->xd and ref->ic are not valid yet. */ | |
832 | xd = jffs2_find_xattr_datum(c, ref->xid); | |
833 | ic = jffs2_get_ino_cache(c, ref->ino); | |
27c72b04 | 834 | if (!xd || !ic || !ic->pino_nlink) { |
8a13695c KK |
835 | dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", |
836 | ref->ino, ref->xid, ref->xseqno); | |
837 | ref->xseqno |= XREF_DELETE_MARKER; | |
c9f700f8 KK |
838 | ref->next = c->xref_dead_list; |
839 | c->xref_dead_list = ref; | |
8a13695c | 840 | xref_orphan_count++; |
c9f700f8 KK |
841 | continue; |
842 | } | |
843 | ref->xd = xd; | |
844 | ref->ic = ic; | |
2c887e23 | 845 | atomic_inc(&xd->refcnt); |
c9f700f8 KK |
846 | ref->next = ic->xref; |
847 | ic->xref = ref; | |
c9f700f8 KK |
848 | } |
849 | } | |
850 | ||
8a13695c | 851 | /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ |
aa98d7cf KK |
852 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { |
853 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { | |
8a13695c | 854 | xdatum_count++; |
aa98d7cf | 855 | list_del_init(&xd->xindex); |
2c887e23 | 856 | if (!atomic_read(&xd->refcnt)) { |
8a13695c KK |
857 | dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", |
858 | xd->xid, xd->version); | |
859 | xd->flags |= JFFS2_XFLAGS_DEAD; | |
c9f700f8 | 860 | list_add(&xd->xindex, &c->xattr_unchecked); |
8a13695c | 861 | xdatum_orphan_count++; |
aa98d7cf KK |
862 | continue; |
863 | } | |
c9f700f8 KK |
864 | if (is_xattr_datum_unchecked(c, xd)) { |
865 | dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", | |
866 | xd->xid, xd->version); | |
aa98d7cf KK |
867 | list_add(&xd->xindex, &c->xattr_unchecked); |
868 | xdatum_unchecked_count++; | |
869 | } | |
aa98d7cf KK |
870 | } |
871 | } | |
872 | /* build complete */ | |
8a13695c KK |
873 | JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" |
874 | " (%u unchecked, %u orphan) and " | |
875 | "%u of xref (%u dead, %u orphan) found.\n", | |
876 | xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, | |
877 | xref_count, xref_dead_count, xref_orphan_count); | |
aa98d7cf KK |
878 | } |
879 | ||
880 | struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, | |
881 | uint32_t xid, uint32_t version) | |
882 | { | |
c9f700f8 | 883 | struct jffs2_xattr_datum *xd; |
aa98d7cf | 884 | |
c9f700f8 KK |
885 | xd = jffs2_find_xattr_datum(c, xid); |
886 | if (!xd) { | |
887 | xd = jffs2_alloc_xattr_datum(); | |
888 | if (!xd) | |
889 | return ERR_PTR(-ENOMEM); | |
890 | xd->xid = xid; | |
891 | xd->version = version; | |
892 | if (xd->xid > c->highest_xid) | |
893 | c->highest_xid = xd->xid; | |
894 | list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); | |
aa98d7cf KK |
895 | } |
896 | return xd; | |
897 | } | |
898 | ||
899 | /* -------- xattr subsystem functions --------------- | |
900 | * xprefix_to_handler(xprefix) | |
901 | * is used to translate xprefix into xattr_handler. | |
902 | * jffs2_listxattr(dentry, buffer, size) | |
903 | * is an implementation of listxattr handler on jffs2. | |
904 | * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) | |
905 | * is an implementation of getxattr handler on jffs2. | |
906 | * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) | |
907 | * is an implementation of setxattr handler on jffs2. | |
908 | * -------------------------------------------------- */ | |
365f0cb9 | 909 | const struct xattr_handler *jffs2_xattr_handlers[] = { |
aa98d7cf KK |
910 | &jffs2_user_xattr_handler, |
911 | #ifdef CONFIG_JFFS2_FS_SECURITY | |
912 | &jffs2_security_xattr_handler, | |
913 | #endif | |
914 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
915 | &jffs2_acl_access_xattr_handler, | |
916 | &jffs2_acl_default_xattr_handler, | |
917 | #endif | |
918 | &jffs2_trusted_xattr_handler, | |
919 | NULL | |
920 | }; | |
921 | ||
365f0cb9 SH |
922 | static const struct xattr_handler *xprefix_to_handler(int xprefix) { |
923 | const struct xattr_handler *ret; | |
aa98d7cf KK |
924 | |
925 | switch (xprefix) { | |
926 | case JFFS2_XPREFIX_USER: | |
927 | ret = &jffs2_user_xattr_handler; | |
928 | break; | |
929 | #ifdef CONFIG_JFFS2_FS_SECURITY | |
930 | case JFFS2_XPREFIX_SECURITY: | |
931 | ret = &jffs2_security_xattr_handler; | |
932 | break; | |
933 | #endif | |
934 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
935 | case JFFS2_XPREFIX_ACL_ACCESS: | |
936 | ret = &jffs2_acl_access_xattr_handler; | |
937 | break; | |
938 | case JFFS2_XPREFIX_ACL_DEFAULT: | |
939 | ret = &jffs2_acl_default_xattr_handler; | |
940 | break; | |
941 | #endif | |
942 | case JFFS2_XPREFIX_TRUSTED: | |
943 | ret = &jffs2_trusted_xattr_handler; | |
944 | break; | |
945 | default: | |
946 | ret = NULL; | |
947 | break; | |
948 | } | |
949 | return ret; | |
950 | } | |
951 | ||
952 | ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) | |
953 | { | |
954 | struct inode *inode = dentry->d_inode; | |
955 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
956 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
957 | struct jffs2_inode_cache *ic = f->inocache; | |
8f2b6f49 | 958 | struct jffs2_xattr_ref *ref, **pref; |
aa98d7cf | 959 | struct jffs2_xattr_datum *xd; |
365f0cb9 | 960 | const struct xattr_handler *xhandle; |
aa98d7cf KK |
961 | ssize_t len, rc; |
962 | int retry = 0; | |
963 | ||
8f2b6f49 | 964 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
965 | if (unlikely(rc)) |
966 | return rc; | |
967 | ||
968 | down_read(&c->xattr_sem); | |
969 | retry: | |
970 | len = 0; | |
8f2b6f49 | 971 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
972 | BUG_ON(ref->ic != ic); |
973 | xd = ref->xd; | |
974 | if (!xd->xname) { | |
975 | /* xdatum is unchached */ | |
976 | if (!retry) { | |
977 | retry = 1; | |
978 | up_read(&c->xattr_sem); | |
979 | down_write(&c->xattr_sem); | |
980 | goto retry; | |
981 | } else { | |
982 | rc = load_xattr_datum(c, xd); | |
983 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 984 | *pref = ref->next; |
8a13695c | 985 | delete_xattr_ref(c, ref); |
aa98d7cf KK |
986 | goto retry; |
987 | } else if (unlikely(rc < 0)) | |
988 | goto out; | |
989 | } | |
990 | } | |
991 | xhandle = xprefix_to_handler(xd->xprefix); | |
992 | if (!xhandle) | |
993 | continue; | |
994 | if (buffer) { | |
431547b3 CH |
995 | rc = xhandle->list(dentry, buffer+len, size-len, |
996 | xd->xname, xd->name_len, xd->flags); | |
aa98d7cf | 997 | } else { |
431547b3 CH |
998 | rc = xhandle->list(dentry, NULL, 0, xd->xname, |
999 | xd->name_len, xd->flags); | |
aa98d7cf KK |
1000 | } |
1001 | if (rc < 0) | |
1002 | goto out; | |
1003 | len += rc; | |
1004 | } | |
1005 | rc = len; | |
1006 | out: | |
1007 | if (!retry) { | |
1008 | up_read(&c->xattr_sem); | |
1009 | } else { | |
1010 | up_write(&c->xattr_sem); | |
1011 | } | |
1012 | return rc; | |
1013 | } | |
1014 | ||
1015 | int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, | |
1016 | char *buffer, size_t size) | |
1017 | { | |
1018 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1019 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
1020 | struct jffs2_inode_cache *ic = f->inocache; | |
1021 | struct jffs2_xattr_datum *xd; | |
8f2b6f49 | 1022 | struct jffs2_xattr_ref *ref, **pref; |
aa98d7cf KK |
1023 | int rc, retry = 0; |
1024 | ||
8f2b6f49 | 1025 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
1026 | if (unlikely(rc)) |
1027 | return rc; | |
1028 | ||
1029 | down_read(&c->xattr_sem); | |
1030 | retry: | |
8f2b6f49 | 1031 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
1032 | BUG_ON(ref->ic!=ic); |
1033 | ||
1034 | xd = ref->xd; | |
1035 | if (xd->xprefix != xprefix) | |
1036 | continue; | |
1037 | if (!xd->xname) { | |
1038 | /* xdatum is unchached */ | |
1039 | if (!retry) { | |
1040 | retry = 1; | |
1041 | up_read(&c->xattr_sem); | |
1042 | down_write(&c->xattr_sem); | |
1043 | goto retry; | |
1044 | } else { | |
1045 | rc = load_xattr_datum(c, xd); | |
1046 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 1047 | *pref = ref->next; |
8a13695c | 1048 | delete_xattr_ref(c, ref); |
aa98d7cf KK |
1049 | goto retry; |
1050 | } else if (unlikely(rc < 0)) { | |
1051 | goto out; | |
1052 | } | |
1053 | } | |
1054 | } | |
1055 | if (!strcmp(xname, xd->xname)) { | |
1056 | rc = xd->value_len; | |
1057 | if (buffer) { | |
1058 | if (size < rc) { | |
1059 | rc = -ERANGE; | |
1060 | } else { | |
1061 | memcpy(buffer, xd->xvalue, rc); | |
1062 | } | |
1063 | } | |
1064 | goto out; | |
1065 | } | |
1066 | } | |
1067 | rc = -ENODATA; | |
1068 | out: | |
1069 | if (!retry) { | |
1070 | up_read(&c->xattr_sem); | |
1071 | } else { | |
1072 | up_write(&c->xattr_sem); | |
1073 | } | |
1074 | return rc; | |
1075 | } | |
1076 | ||
1077 | int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, | |
1078 | const char *buffer, size_t size, int flags) | |
1079 | { | |
1080 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1081 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
1082 | struct jffs2_inode_cache *ic = f->inocache; | |
1083 | struct jffs2_xattr_datum *xd; | |
8f2b6f49 | 1084 | struct jffs2_xattr_ref *ref, *newref, **pref; |
9fe4854c | 1085 | uint32_t length, request; |
aa98d7cf KK |
1086 | int rc; |
1087 | ||
8f2b6f49 | 1088 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
1089 | if (unlikely(rc)) |
1090 | return rc; | |
1091 | ||
1092 | request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); | |
9fe4854c | 1093 | rc = jffs2_reserve_space(c, request, &length, |
aa98d7cf KK |
1094 | ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); |
1095 | if (rc) { | |
1096 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); | |
1097 | return rc; | |
1098 | } | |
1099 | ||
1100 | /* Find existing xattr */ | |
1101 | down_write(&c->xattr_sem); | |
1102 | retry: | |
8f2b6f49 | 1103 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
1104 | xd = ref->xd; |
1105 | if (xd->xprefix != xprefix) | |
1106 | continue; | |
1107 | if (!xd->xname) { | |
1108 | rc = load_xattr_datum(c, xd); | |
1109 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 1110 | *pref = ref->next; |
8a13695c | 1111 | delete_xattr_ref(c, ref); |
aa98d7cf KK |
1112 | goto retry; |
1113 | } else if (unlikely(rc < 0)) | |
1114 | goto out; | |
1115 | } | |
1116 | if (!strcmp(xd->xname, xname)) { | |
1117 | if (flags & XATTR_CREATE) { | |
1118 | rc = -EEXIST; | |
1119 | goto out; | |
1120 | } | |
1121 | if (!buffer) { | |
8a13695c KK |
1122 | ref->ino = ic->ino; |
1123 | ref->xid = xd->xid; | |
1124 | ref->xseqno |= XREF_DELETE_MARKER; | |
1125 | rc = save_xattr_ref(c, ref); | |
1126 | if (!rc) { | |
1127 | *pref = ref->next; | |
1128 | spin_lock(&c->erase_completion_lock); | |
1129 | ref->next = c->xref_dead_list; | |
1130 | c->xref_dead_list = ref; | |
1131 | spin_unlock(&c->erase_completion_lock); | |
c6e8c6cc | 1132 | unrefer_xattr_datum(c, xd); |
8a13695c KK |
1133 | } else { |
1134 | ref->ic = ic; | |
1135 | ref->xd = xd; | |
1136 | ref->xseqno &= ~XREF_DELETE_MARKER; | |
1137 | } | |
aa98d7cf KK |
1138 | goto out; |
1139 | } | |
1140 | goto found; | |
1141 | } | |
1142 | } | |
1143 | /* not found */ | |
aa98d7cf KK |
1144 | if (flags & XATTR_REPLACE) { |
1145 | rc = -ENODATA; | |
1146 | goto out; | |
1147 | } | |
1148 | if (!buffer) { | |
c9f700f8 | 1149 | rc = -ENODATA; |
aa98d7cf KK |
1150 | goto out; |
1151 | } | |
1152 | found: | |
9fe4854c | 1153 | xd = create_xattr_datum(c, xprefix, xname, buffer, size); |
aa98d7cf KK |
1154 | if (IS_ERR(xd)) { |
1155 | rc = PTR_ERR(xd); | |
1156 | goto out; | |
1157 | } | |
1158 | up_write(&c->xattr_sem); | |
1159 | jffs2_complete_reservation(c); | |
1160 | ||
1161 | /* create xattr_ref */ | |
1162 | request = PAD(sizeof(struct jffs2_raw_xref)); | |
9fe4854c | 1163 | rc = jffs2_reserve_space(c, request, &length, |
aa98d7cf | 1164 | ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); |
c9f700f8 | 1165 | down_write(&c->xattr_sem); |
aa98d7cf KK |
1166 | if (rc) { |
1167 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); | |
c6e8c6cc | 1168 | unrefer_xattr_datum(c, xd); |
aa98d7cf KK |
1169 | up_write(&c->xattr_sem); |
1170 | return rc; | |
1171 | } | |
8f2b6f49 KK |
1172 | if (ref) |
1173 | *pref = ref->next; | |
9fe4854c | 1174 | newref = create_xattr_ref(c, ic, xd); |
aa98d7cf | 1175 | if (IS_ERR(newref)) { |
8f2b6f49 KK |
1176 | if (ref) { |
1177 | ref->next = ic->xref; | |
1178 | ic->xref = ref; | |
1179 | } | |
aa98d7cf | 1180 | rc = PTR_ERR(newref); |
c6e8c6cc | 1181 | unrefer_xattr_datum(c, xd); |
aa98d7cf | 1182 | } else if (ref) { |
8a13695c | 1183 | delete_xattr_ref(c, ref); |
aa98d7cf KK |
1184 | } |
1185 | out: | |
1186 | up_write(&c->xattr_sem); | |
1187 | jffs2_complete_reservation(c); | |
1188 | return rc; | |
1189 | } | |
1190 | ||
1191 | /* -------- garbage collector functions ------------- | |
c9f700f8 | 1192 | * jffs2_garbage_collect_xattr_datum(c, xd, raw) |
aa98d7cf | 1193 | * is used to move xdatum into new node. |
c9f700f8 | 1194 | * jffs2_garbage_collect_xattr_ref(c, ref, raw) |
aa98d7cf | 1195 | * is used to move xref into new node. |
aa98d7cf KK |
1196 | * jffs2_verify_xattr(c) |
1197 | * is used to call do_verify_xattr_datum() before garbage collecting. | |
8a13695c KK |
1198 | * jffs2_release_xattr_datum(c, xd) |
1199 | * is used to release an in-memory object of xdatum. | |
1200 | * jffs2_release_xattr_ref(c, ref) | |
1201 | * is used to release an in-memory object of xref. | |
aa98d7cf | 1202 | * -------------------------------------------------- */ |
c9f700f8 KK |
1203 | int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, |
1204 | struct jffs2_raw_node_ref *raw) | |
aa98d7cf | 1205 | { |
9fe4854c | 1206 | uint32_t totlen, length, old_ofs; |
c9f700f8 | 1207 | int rc = 0; |
aa98d7cf | 1208 | |
084702e0 | 1209 | down_write(&c->xattr_sem); |
c9f700f8 KK |
1210 | if (xd->node != raw) |
1211 | goto out; | |
8a13695c | 1212 | if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) |
c9f700f8 | 1213 | goto out; |
aa98d7cf | 1214 | |
8a13695c KK |
1215 | rc = load_xattr_datum(c, xd); |
1216 | if (unlikely(rc)) { | |
1217 | rc = (rc > 0) ? 0 : rc; | |
1218 | goto out; | |
aa98d7cf | 1219 | } |
8a13695c KK |
1220 | old_ofs = ref_offset(xd->node); |
1221 | totlen = PAD(sizeof(struct jffs2_raw_xattr) | |
1222 | + xd->name_len + 1 + xd->value_len); | |
9fe4854c | 1223 | rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); |
c9f700f8 KK |
1224 | if (rc) { |
1225 | JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); | |
084702e0 | 1226 | goto out; |
aa98d7cf | 1227 | } |
9fe4854c | 1228 | rc = save_xattr_datum(c, xd); |
aa98d7cf KK |
1229 | if (!rc) |
1230 | dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", | |
1231 | xd->xid, xd->version, old_ofs, ref_offset(xd->node)); | |
084702e0 | 1232 | out: |
c9f700f8 KK |
1233 | if (!rc) |
1234 | jffs2_mark_node_obsolete(c, raw); | |
084702e0 | 1235 | up_write(&c->xattr_sem); |
aa98d7cf KK |
1236 | return rc; |
1237 | } | |
1238 | ||
c9f700f8 KK |
1239 | int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, |
1240 | struct jffs2_raw_node_ref *raw) | |
aa98d7cf | 1241 | { |
9fe4854c | 1242 | uint32_t totlen, length, old_ofs; |
c9f700f8 | 1243 | int rc = 0; |
aa98d7cf | 1244 | |
084702e0 | 1245 | down_write(&c->xattr_sem); |
aa98d7cf KK |
1246 | BUG_ON(!ref->node); |
1247 | ||
c9f700f8 KK |
1248 | if (ref->node != raw) |
1249 | goto out; | |
1250 | if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) | |
1251 | goto out; | |
1252 | ||
aa98d7cf KK |
1253 | old_ofs = ref_offset(ref->node); |
1254 | totlen = ref_totlen(c, c->gcblock, ref->node); | |
084702e0 | 1255 | |
9fe4854c | 1256 | rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); |
c9f700f8 KK |
1257 | if (rc) { |
1258 | JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", | |
8e24eea7 | 1259 | __func__, rc, totlen); |
084702e0 KK |
1260 | rc = rc ? rc : -EBADFD; |
1261 | goto out; | |
aa98d7cf | 1262 | } |
9fe4854c | 1263 | rc = save_xattr_ref(c, ref); |
aa98d7cf KK |
1264 | if (!rc) |
1265 | dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", | |
1266 | ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); | |
084702e0 | 1267 | out: |
c9f700f8 KK |
1268 | if (!rc) |
1269 | jffs2_mark_node_obsolete(c, raw); | |
084702e0 | 1270 | up_write(&c->xattr_sem); |
aa98d7cf KK |
1271 | return rc; |
1272 | } | |
1273 | ||
aa98d7cf KK |
1274 | int jffs2_verify_xattr(struct jffs2_sb_info *c) |
1275 | { | |
1276 | struct jffs2_xattr_datum *xd, *_xd; | |
c9f700f8 KK |
1277 | struct jffs2_eraseblock *jeb; |
1278 | struct jffs2_raw_node_ref *raw; | |
1279 | uint32_t totlen; | |
aa98d7cf KK |
1280 | int rc; |
1281 | ||
1282 | down_write(&c->xattr_sem); | |
1283 | list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { | |
1284 | rc = do_verify_xattr_datum(c, xd); | |
c9f700f8 KK |
1285 | if (rc < 0) |
1286 | continue; | |
1287 | list_del_init(&xd->xindex); | |
1288 | spin_lock(&c->erase_completion_lock); | |
1289 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { | |
1290 | if (ref_flags(raw) != REF_UNCHECKED) | |
1291 | continue; | |
1292 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; | |
1293 | totlen = PAD(ref_totlen(c, jeb, raw)); | |
1294 | c->unchecked_size -= totlen; c->used_size += totlen; | |
1295 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
1296 | raw->flash_offset = ref_offset(raw) | |
1297 | | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); | |
aa98d7cf | 1298 | } |
8a13695c | 1299 | if (xd->flags & JFFS2_XFLAGS_DEAD) |
c9f700f8 KK |
1300 | list_add(&xd->xindex, &c->xattr_dead_list); |
1301 | spin_unlock(&c->erase_completion_lock); | |
aa98d7cf KK |
1302 | } |
1303 | up_write(&c->xattr_sem); | |
aa98d7cf KK |
1304 | return list_empty(&c->xattr_unchecked) ? 1 : 0; |
1305 | } | |
c9f700f8 KK |
1306 | |
1307 | void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
1308 | { | |
1309 | /* must be called under spin_lock(&c->erase_completion_lock) */ | |
2c887e23 | 1310 | if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) |
c9f700f8 KK |
1311 | return; |
1312 | ||
1313 | list_del(&xd->xindex); | |
1314 | jffs2_free_xattr_datum(xd); | |
1315 | } | |
1316 | ||
1317 | void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
1318 | { | |
1319 | /* must be called under spin_lock(&c->erase_completion_lock) */ | |
1320 | struct jffs2_xattr_ref *tmp, **ptmp; | |
1321 | ||
1322 | if (ref->node != (void *)ref) | |
1323 | return; | |
1324 | ||
1325 | for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { | |
1326 | if (ref == tmp) { | |
1327 | *ptmp = tmp->next; | |
c9f700f8 KK |
1328 | break; |
1329 | } | |
1330 | } | |
8a13695c | 1331 | jffs2_free_xattr_ref(ref); |
c9f700f8 | 1332 | } |