Commit | Line | Data |
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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 | ||
9824f75d JCD |
14 | #define JFFS2_XATTR_IS_CORRUPTED 1 |
15 | ||
aa98d7cf KK |
16 | #include <linux/kernel.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/time.h> | |
20 | #include <linux/pagemap.h> | |
21 | #include <linux/highmem.h> | |
22 | #include <linux/crc32.h> | |
23 | #include <linux/jffs2.h> | |
24 | #include <linux/xattr.h> | |
25 | #include <linux/mtd/mtd.h> | |
26 | #include "nodelist.h" | |
27 | /* -------- xdatum related functions ---------------- | |
28 | * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) | |
29 | * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is | |
30 | * the index of the xattr name/value pair cache (c->xattrindex). | |
c9f700f8 KK |
31 | * is_xattr_datum_unchecked(c, xd) |
32 | * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not | |
33 | * unchecked, it returns 0. | |
aa98d7cf KK |
34 | * unload_xattr_datum(c, xd) |
35 | * is used to release xattr name/value pair and detach from c->xattrindex. | |
36 | * reclaim_xattr_datum(c) | |
37 | * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when | |
bea93128 | 38 | * memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold |
aa98d7cf | 39 | * is hard coded as 32KiB. |
aa98d7cf KK |
40 | * do_verify_xattr_datum(c, xd) |
41 | * is used to load the xdatum informations without name/value pair from the medium. | |
42 | * It's necessary once, because those informations are not collected during mounting | |
43 | * process when EBS is enabled. | |
44 | * 0 will be returned, if success. An negative return value means recoverable error, and | |
45 | * positive return value means unrecoverable error. Thus, caller must remove this xdatum | |
46 | * and xref when it returned positive value. | |
47 | * do_load_xattr_datum(c, xd) | |
48 | * is used to load name/value pair from the medium. | |
49 | * The meanings of return value is same as do_verify_xattr_datum(). | |
50 | * load_xattr_datum(c, xd) | |
51 | * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). | |
52 | * If xd need to call do_verify_xattr_datum() at first, it's called before calling | |
53 | * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). | |
9fe4854c | 54 | * save_xattr_datum(c, xd) |
aa98d7cf | 55 | * is used to write xdatum to medium. xd->version will be incremented. |
9fe4854c | 56 | * create_xattr_datum(c, xprefix, xname, xvalue, xsize) |
aa98d7cf | 57 | * is used to create new xdatum and write to medium. |
c6e8c6cc KK |
58 | * unrefer_xattr_datum(c, xd) |
59 | * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD | |
60 | * is set on xd->flags and chained xattr_dead_list or release it immediately. | |
61 | * In the first case, the garbage collector release it later. | |
aa98d7cf | 62 | * -------------------------------------------------- */ |
aa98d7cf KK |
63 | static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) |
64 | { | |
65 | int name_len = strlen(xname); | |
66 | ||
67 | return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); | |
68 | } | |
69 | ||
c9f700f8 KK |
70 | static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
71 | { | |
72 | struct jffs2_raw_node_ref *raw; | |
73 | int rc = 0; | |
74 | ||
75 | spin_lock(&c->erase_completion_lock); | |
76 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { | |
77 | if (ref_flags(raw) == REF_UNCHECKED) { | |
78 | rc = 1; | |
79 | break; | |
80 | } | |
81 | } | |
82 | spin_unlock(&c->erase_completion_lock); | |
83 | return rc; | |
84 | } | |
85 | ||
aa98d7cf KK |
86 | static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
87 | { | |
88 | /* must be called under down_write(xattr_sem) */ | |
8e24eea7 | 89 | D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); |
aa98d7cf KK |
90 | if (xd->xname) { |
91 | c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); | |
92 | kfree(xd->xname); | |
93 | } | |
94 | ||
95 | list_del_init(&xd->xindex); | |
96 | xd->hashkey = 0; | |
97 | xd->xname = NULL; | |
98 | xd->xvalue = NULL; | |
99 | } | |
100 | ||
101 | static void reclaim_xattr_datum(struct jffs2_sb_info *c) | |
102 | { | |
103 | /* must be called under down_write(xattr_sem) */ | |
104 | struct jffs2_xattr_datum *xd, *_xd; | |
105 | uint32_t target, before; | |
106 | static int index = 0; | |
107 | int count; | |
108 | ||
109 | if (c->xdatum_mem_threshold > c->xdatum_mem_usage) | |
110 | return; | |
111 | ||
112 | before = c->xdatum_mem_usage; | |
113 | target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ | |
114 | for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { | |
115 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { | |
116 | if (xd->flags & JFFS2_XFLAGS_HOT) { | |
117 | xd->flags &= ~JFFS2_XFLAGS_HOT; | |
118 | } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { | |
119 | unload_xattr_datum(c, xd); | |
120 | } | |
121 | if (c->xdatum_mem_usage <= target) | |
122 | goto out; | |
123 | } | |
124 | index = (index+1) % XATTRINDEX_HASHSIZE; | |
125 | } | |
126 | out: | |
127 | JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", | |
128 | before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); | |
129 | } | |
130 | ||
aa98d7cf KK |
131 | static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
132 | { | |
133 | /* must be called under down_write(xattr_sem) */ | |
134 | struct jffs2_eraseblock *jeb; | |
c9f700f8 | 135 | struct jffs2_raw_node_ref *raw; |
aa98d7cf KK |
136 | struct jffs2_raw_xattr rx; |
137 | size_t readlen; | |
c9f700f8 | 138 | uint32_t crc, offset, totlen; |
aa98d7cf KK |
139 | int rc; |
140 | ||
c9f700f8 KK |
141 | spin_lock(&c->erase_completion_lock); |
142 | offset = ref_offset(xd->node); | |
143 | if (ref_flags(xd->node) == REF_PRISTINE) | |
144 | goto complete; | |
145 | spin_unlock(&c->erase_completion_lock); | |
aa98d7cf | 146 | |
c9f700f8 | 147 | rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); |
aa98d7cf | 148 | if (rc || readlen != sizeof(rx)) { |
89291a9d | 149 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", |
c9f700f8 | 150 | rc, sizeof(rx), readlen, offset); |
aa98d7cf KK |
151 | return rc ? rc : -EIO; |
152 | } | |
153 | crc = crc32(0, &rx, sizeof(rx) - 4); | |
154 | if (crc != je32_to_cpu(rx.node_crc)) { | |
c9f700f8 KK |
155 | JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
156 | offset, je32_to_cpu(rx.hdr_crc), crc); | |
157 | xd->flags |= JFFS2_XFLAGS_INVALID; | |
9824f75d | 158 | return JFFS2_XATTR_IS_CORRUPTED; |
aa98d7cf | 159 | } |
8a13695c | 160 | totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); |
aa98d7cf KK |
161 | if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK |
162 | || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR | |
163 | || je32_to_cpu(rx.totlen) != totlen | |
164 | || je32_to_cpu(rx.xid) != xd->xid | |
165 | || je32_to_cpu(rx.version) != xd->version) { | |
166 | JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " | |
167 | "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", | |
c9f700f8 | 168 | offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, |
aa98d7cf KK |
169 | je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, |
170 | je32_to_cpu(rx.totlen), totlen, | |
171 | je32_to_cpu(rx.xid), xd->xid, | |
172 | je32_to_cpu(rx.version), xd->version); | |
c9f700f8 | 173 | xd->flags |= JFFS2_XFLAGS_INVALID; |
9824f75d | 174 | return JFFS2_XATTR_IS_CORRUPTED; |
aa98d7cf KK |
175 | } |
176 | xd->xprefix = rx.xprefix; | |
177 | xd->name_len = rx.name_len; | |
178 | xd->value_len = je16_to_cpu(rx.value_len); | |
179 | xd->data_crc = je32_to_cpu(rx.data_crc); | |
180 | ||
aa98d7cf | 181 | spin_lock(&c->erase_completion_lock); |
c9f700f8 KK |
182 | complete: |
183 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { | |
184 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; | |
185 | totlen = PAD(ref_totlen(c, jeb, raw)); | |
186 | if (ref_flags(raw) == REF_UNCHECKED) { | |
187 | c->unchecked_size -= totlen; c->used_size += totlen; | |
188 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
189 | } | |
190 | raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); | |
191 | } | |
aa98d7cf KK |
192 | spin_unlock(&c->erase_completion_lock); |
193 | ||
194 | /* unchecked xdatum is chained with c->xattr_unchecked */ | |
195 | list_del_init(&xd->xindex); | |
196 | ||
197 | dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n", | |
198 | xd->xid, xd->version); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
204 | { | |
205 | /* must be called under down_write(xattr_sem) */ | |
206 | char *data; | |
207 | size_t readlen; | |
208 | uint32_t crc, length; | |
209 | int i, ret, retry = 0; | |
210 | ||
aa98d7cf KK |
211 | BUG_ON(ref_flags(xd->node) != REF_PRISTINE); |
212 | BUG_ON(!list_empty(&xd->xindex)); | |
213 | retry: | |
214 | length = xd->name_len + 1 + xd->value_len; | |
215 | data = kmalloc(length, GFP_KERNEL); | |
216 | if (!data) | |
217 | return -ENOMEM; | |
218 | ||
219 | ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), | |
220 | length, &readlen, data); | |
221 | ||
222 | if (ret || length!=readlen) { | |
89291a9d | 223 | JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", |
aa98d7cf KK |
224 | ret, length, readlen, ref_offset(xd->node)); |
225 | kfree(data); | |
226 | return ret ? ret : -EIO; | |
227 | } | |
228 | ||
229 | data[xd->name_len] = '\0'; | |
230 | crc = crc32(0, data, length); | |
231 | if (crc != xd->data_crc) { | |
9824f75d | 232 | JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XATTR)" |
aa98d7cf KK |
233 | " at %#08x, read: 0x%08x calculated: 0x%08x\n", |
234 | ref_offset(xd->node), xd->data_crc, crc); | |
235 | kfree(data); | |
c9f700f8 | 236 | xd->flags |= JFFS2_XFLAGS_INVALID; |
9824f75d | 237 | return JFFS2_XATTR_IS_CORRUPTED; |
aa98d7cf KK |
238 | } |
239 | ||
240 | xd->flags |= JFFS2_XFLAGS_HOT; | |
241 | xd->xname = data; | |
242 | xd->xvalue = data + xd->name_len+1; | |
243 | ||
244 | c->xdatum_mem_usage += length; | |
245 | ||
246 | xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); | |
247 | i = xd->hashkey % XATTRINDEX_HASHSIZE; | |
248 | list_add(&xd->xindex, &c->xattrindex[i]); | |
249 | if (!retry) { | |
250 | retry = 1; | |
251 | reclaim_xattr_datum(c); | |
252 | if (!xd->xname) | |
253 | goto retry; | |
254 | } | |
255 | ||
256 | dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", | |
257 | xd->xid, xd->xprefix, xd->xname); | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
263 | { | |
264 | /* must be called under down_write(xattr_sem); | |
265 | * rc < 0 : recoverable error, try again | |
266 | * rc = 0 : success | |
267 | * rc > 0 : Unrecoverable error, this node should be deleted. | |
268 | */ | |
269 | int rc = 0; | |
c9f700f8 | 270 | |
8a13695c | 271 | BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); |
c9f700f8 KK |
272 | if (xd->xname) |
273 | return 0; | |
274 | if (xd->flags & JFFS2_XFLAGS_INVALID) | |
9824f75d | 275 | return JFFS2_XATTR_IS_CORRUPTED; |
c9f700f8 | 276 | if (unlikely(is_xattr_datum_unchecked(c, xd))) |
aa98d7cf | 277 | rc = do_verify_xattr_datum(c, xd); |
aa98d7cf KK |
278 | if (!rc) |
279 | rc = do_load_xattr_datum(c, xd); | |
280 | return rc; | |
281 | } | |
282 | ||
9fe4854c | 283 | static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
aa98d7cf KK |
284 | { |
285 | /* must be called under down_write(xattr_sem) */ | |
2f785402 | 286 | struct jffs2_raw_xattr rx; |
aa98d7cf | 287 | struct kvec vecs[2]; |
89291a9d | 288 | size_t length; |
8a13695c | 289 | int rc, totlen; |
9fe4854c | 290 | uint32_t phys_ofs = write_ofs(c); |
aa98d7cf | 291 | |
8a13695c KK |
292 | BUG_ON(!xd->xname); |
293 | BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); | |
aa98d7cf KK |
294 | |
295 | vecs[0].iov_base = ℞ | |
8a13695c KK |
296 | vecs[0].iov_len = sizeof(rx); |
297 | vecs[1].iov_base = xd->xname; | |
298 | vecs[1].iov_len = xd->name_len + 1 + xd->value_len; | |
299 | totlen = vecs[0].iov_len + vecs[1].iov_len; | |
300 | ||
aa98d7cf | 301 | /* Setup raw-xattr */ |
c9f700f8 | 302 | memset(&rx, 0, sizeof(rx)); |
aa98d7cf KK |
303 | rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
304 | rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); | |
305 | rx.totlen = cpu_to_je32(PAD(totlen)); | |
306 | rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); | |
307 | ||
308 | rx.xid = cpu_to_je32(xd->xid); | |
8a13695c KK |
309 | rx.version = cpu_to_je32(++xd->version); |
310 | rx.xprefix = xd->xprefix; | |
311 | rx.name_len = xd->name_len; | |
312 | rx.value_len = cpu_to_je16(xd->value_len); | |
313 | rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); | |
aa98d7cf KK |
314 | rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); |
315 | ||
8a13695c | 316 | rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); |
aa98d7cf | 317 | if (rc || totlen != length) { |
89291a9d | 318 | JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", |
aa98d7cf KK |
319 | rc, totlen, length, phys_ofs); |
320 | rc = rc ? rc : -EIO; | |
2f785402 DW |
321 | if (length) |
322 | jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); | |
323 | ||
aa98d7cf KK |
324 | return rc; |
325 | } | |
aa98d7cf | 326 | /* success */ |
c9f700f8 | 327 | jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); |
aa98d7cf KK |
328 | |
329 | dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", | |
330 | xd->xid, xd->version, xd->xprefix, xd->xname); | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, | |
336 | int xprefix, const char *xname, | |
9fe4854c | 337 | const char *xvalue, int xsize) |
aa98d7cf KK |
338 | { |
339 | /* must be called under down_write(xattr_sem) */ | |
340 | struct jffs2_xattr_datum *xd; | |
341 | uint32_t hashkey, name_len; | |
342 | char *data; | |
343 | int i, rc; | |
344 | ||
345 | /* Search xattr_datum has same xname/xvalue by index */ | |
346 | hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); | |
347 | i = hashkey % XATTRINDEX_HASHSIZE; | |
348 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { | |
349 | if (xd->hashkey==hashkey | |
350 | && xd->xprefix==xprefix | |
351 | && xd->value_len==xsize | |
352 | && !strcmp(xd->xname, xname) | |
353 | && !memcmp(xd->xvalue, xvalue, xsize)) { | |
2c887e23 | 354 | atomic_inc(&xd->refcnt); |
aa98d7cf KK |
355 | return xd; |
356 | } | |
357 | } | |
358 | ||
359 | /* Not found, Create NEW XATTR-Cache */ | |
360 | name_len = strlen(xname); | |
361 | ||
362 | xd = jffs2_alloc_xattr_datum(); | |
363 | if (!xd) | |
364 | return ERR_PTR(-ENOMEM); | |
365 | ||
366 | data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); | |
367 | if (!data) { | |
368 | jffs2_free_xattr_datum(xd); | |
369 | return ERR_PTR(-ENOMEM); | |
370 | } | |
371 | strcpy(data, xname); | |
372 | memcpy(data + name_len + 1, xvalue, xsize); | |
373 | ||
2c887e23 | 374 | atomic_set(&xd->refcnt, 1); |
aa98d7cf KK |
375 | xd->xid = ++c->highest_xid; |
376 | xd->flags |= JFFS2_XFLAGS_HOT; | |
377 | xd->xprefix = xprefix; | |
378 | ||
379 | xd->hashkey = hashkey; | |
380 | xd->xname = data; | |
381 | xd->xvalue = data + name_len + 1; | |
382 | xd->name_len = name_len; | |
383 | xd->value_len = xsize; | |
384 | xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); | |
385 | ||
9fe4854c | 386 | rc = save_xattr_datum(c, xd); |
aa98d7cf KK |
387 | if (rc) { |
388 | kfree(xd->xname); | |
389 | jffs2_free_xattr_datum(xd); | |
390 | return ERR_PTR(rc); | |
391 | } | |
392 | ||
393 | /* Insert Hash Index */ | |
394 | i = hashkey % XATTRINDEX_HASHSIZE; | |
395 | list_add(&xd->xindex, &c->xattrindex[i]); | |
396 | ||
397 | c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); | |
398 | reclaim_xattr_datum(c); | |
399 | ||
400 | return xd; | |
401 | } | |
402 | ||
c6e8c6cc | 403 | static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
c9f700f8 KK |
404 | { |
405 | /* must be called under down_write(xattr_sem) */ | |
c6e8c6cc | 406 | if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { |
c6e8c6cc KK |
407 | unload_xattr_datum(c, xd); |
408 | xd->flags |= JFFS2_XFLAGS_DEAD; | |
409 | if (xd->node == (void *)xd) { | |
410 | BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); | |
411 | jffs2_free_xattr_datum(xd); | |
412 | } else { | |
413 | list_add(&xd->xindex, &c->xattr_dead_list); | |
414 | } | |
415 | spin_unlock(&c->erase_completion_lock); | |
416 | ||
a6b1d82d JG |
417 | dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", |
418 | xd->xid, xd->version); | |
c9f700f8 | 419 | } |
c9f700f8 KK |
420 | } |
421 | ||
21b9879b | 422 | /* -------- xref related functions ------------------ |
aa98d7cf KK |
423 | * verify_xattr_ref(c, ref) |
424 | * is used to load xref information from medium. Because summary data does not | |
425 | * contain xid/ino, it's necessary to verify once while mounting process. | |
9fe4854c | 426 | * save_xattr_ref(c, ref) |
8a13695c KK |
427 | * is used to write xref to medium. If delete marker is marked, it write |
428 | * a delete marker of xref into medium. | |
9fe4854c | 429 | * create_xattr_ref(c, ic, xd) |
aa98d7cf | 430 | * is used to create a new xref and write to medium. |
8a13695c KK |
431 | * delete_xattr_ref(c, ref) |
432 | * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, | |
433 | * and allows GC to reclaim those physical nodes. | |
aa98d7cf KK |
434 | * jffs2_xattr_delete_inode(c, ic) |
435 | * is called to remove xrefs related to obsolete inode when inode is unlinked. | |
436 | * jffs2_xattr_free_inode(c, ic) | |
437 | * is called to release xattr related objects when unmounting. | |
8f2b6f49 | 438 | * check_xattr_ref_inode(c, ic) |
aa98d7cf | 439 | * is used to confirm inode does not have duplicate xattr name/value pair. |
8c5a0366 JCD |
440 | * jffs2_xattr_do_crccheck_inode(c, ic) |
441 | * is used to force xattr data integrity check during the initial gc scan. | |
aa98d7cf KK |
442 | * -------------------------------------------------- */ |
443 | static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
444 | { | |
445 | struct jffs2_eraseblock *jeb; | |
c9f700f8 | 446 | struct jffs2_raw_node_ref *raw; |
aa98d7cf KK |
447 | struct jffs2_raw_xref rr; |
448 | size_t readlen; | |
c9f700f8 | 449 | uint32_t crc, offset, totlen; |
aa98d7cf KK |
450 | int rc; |
451 | ||
c9f700f8 KK |
452 | spin_lock(&c->erase_completion_lock); |
453 | if (ref_flags(ref->node) != REF_UNCHECKED) | |
454 | goto complete; | |
455 | offset = ref_offset(ref->node); | |
456 | spin_unlock(&c->erase_completion_lock); | |
aa98d7cf | 457 | |
c9f700f8 | 458 | rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); |
aa98d7cf | 459 | if (rc || sizeof(rr) != readlen) { |
89291a9d | 460 | JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", |
c9f700f8 | 461 | rc, sizeof(rr), readlen, offset); |
aa98d7cf KK |
462 | return rc ? rc : -EIO; |
463 | } | |
464 | /* obsolete node */ | |
465 | crc = crc32(0, &rr, sizeof(rr) - 4); | |
466 | if (crc != je32_to_cpu(rr.node_crc)) { | |
c9f700f8 KK |
467 | JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
468 | offset, je32_to_cpu(rr.node_crc), crc); | |
9824f75d | 469 | return JFFS2_XATTR_IS_CORRUPTED; |
aa98d7cf KK |
470 | } |
471 | if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK | |
472 | || je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF | |
473 | || je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { | |
474 | JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " | |
89291a9d | 475 | "nodetype=%#04x/%#04x, totlen=%u/%zu\n", |
c9f700f8 | 476 | offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, |
aa98d7cf KK |
477 | je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, |
478 | je32_to_cpu(rr.totlen), PAD(sizeof(rr))); | |
9824f75d | 479 | return JFFS2_XATTR_IS_CORRUPTED; |
aa98d7cf KK |
480 | } |
481 | ref->ino = je32_to_cpu(rr.ino); | |
482 | ref->xid = je32_to_cpu(rr.xid); | |
c9f700f8 KK |
483 | ref->xseqno = je32_to_cpu(rr.xseqno); |
484 | if (ref->xseqno > c->highest_xseqno) | |
485 | c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); | |
aa98d7cf KK |
486 | |
487 | spin_lock(&c->erase_completion_lock); | |
c9f700f8 KK |
488 | complete: |
489 | for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { | |
490 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; | |
491 | totlen = PAD(ref_totlen(c, jeb, raw)); | |
492 | if (ref_flags(raw) == REF_UNCHECKED) { | |
493 | c->unchecked_size -= totlen; c->used_size += totlen; | |
494 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
495 | } | |
496 | raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); | |
497 | } | |
aa98d7cf KK |
498 | spin_unlock(&c->erase_completion_lock); |
499 | ||
500 | dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", | |
501 | ref->ino, ref->xid, ref_offset(ref->node)); | |
502 | return 0; | |
503 | } | |
504 | ||
9fe4854c | 505 | static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
aa98d7cf KK |
506 | { |
507 | /* must be called under down_write(xattr_sem) */ | |
aa98d7cf | 508 | struct jffs2_raw_xref rr; |
89291a9d | 509 | size_t length; |
c9f700f8 | 510 | uint32_t xseqno, phys_ofs = write_ofs(c); |
aa98d7cf KK |
511 | int ret; |
512 | ||
aa98d7cf KK |
513 | rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
514 | rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); | |
515 | rr.totlen = cpu_to_je32(PAD(sizeof(rr))); | |
516 | rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); | |
517 | ||
c9f700f8 KK |
518 | xseqno = (c->highest_xseqno += 2); |
519 | if (is_xattr_ref_dead(ref)) { | |
520 | xseqno |= XREF_DELETE_MARKER; | |
521 | rr.ino = cpu_to_je32(ref->ino); | |
522 | rr.xid = cpu_to_je32(ref->xid); | |
523 | } else { | |
524 | rr.ino = cpu_to_je32(ref->ic->ino); | |
525 | rr.xid = cpu_to_je32(ref->xd->xid); | |
526 | } | |
527 | rr.xseqno = cpu_to_je32(xseqno); | |
aa98d7cf KK |
528 | rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); |
529 | ||
530 | ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); | |
531 | if (ret || sizeof(rr) != length) { | |
89291a9d | 532 | JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", |
aa98d7cf KK |
533 | ret, sizeof(rr), length, phys_ofs); |
534 | ret = ret ? ret : -EIO; | |
2f785402 DW |
535 | if (length) |
536 | jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); | |
537 | ||
aa98d7cf KK |
538 | return ret; |
539 | } | |
c9f700f8 KK |
540 | /* success */ |
541 | ref->xseqno = xseqno; | |
542 | jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); | |
aa98d7cf KK |
543 | |
544 | dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, | |
9fe4854c | 550 | struct jffs2_xattr_datum *xd) |
aa98d7cf KK |
551 | { |
552 | /* must be called under down_write(xattr_sem) */ | |
553 | struct jffs2_xattr_ref *ref; | |
554 | int ret; | |
555 | ||
556 | ref = jffs2_alloc_xattr_ref(); | |
557 | if (!ref) | |
558 | return ERR_PTR(-ENOMEM); | |
559 | ref->ic = ic; | |
560 | ref->xd = xd; | |
561 | ||
9fe4854c | 562 | ret = save_xattr_ref(c, ref); |
aa98d7cf KK |
563 | if (ret) { |
564 | jffs2_free_xattr_ref(ref); | |
565 | return ERR_PTR(ret); | |
566 | } | |
567 | ||
568 | /* Chain to inode */ | |
8f2b6f49 KK |
569 | ref->next = ic->xref; |
570 | ic->xref = ref; | |
aa98d7cf KK |
571 | |
572 | return ref; /* success */ | |
573 | } | |
574 | ||
8a13695c | 575 | static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
c9f700f8 KK |
576 | { |
577 | /* must be called under down_write(xattr_sem) */ | |
578 | struct jffs2_xattr_datum *xd; | |
579 | ||
c9f700f8 | 580 | xd = ref->xd; |
8a13695c | 581 | ref->xseqno |= XREF_DELETE_MARKER; |
c9f700f8 KK |
582 | ref->ino = ref->ic->ino; |
583 | ref->xid = ref->xd->xid; | |
584 | spin_lock(&c->erase_completion_lock); | |
585 | ref->next = c->xref_dead_list; | |
586 | c->xref_dead_list = ref; | |
587 | spin_unlock(&c->erase_completion_lock); | |
588 | ||
8a13695c KK |
589 | dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", |
590 | ref->ino, ref->xid, ref->xseqno); | |
c9f700f8 | 591 | |
c6e8c6cc | 592 | unrefer_xattr_datum(c, xd); |
c9f700f8 KK |
593 | } |
594 | ||
aa98d7cf KK |
595 | void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
596 | { | |
b57922d9 | 597 | /* It's called from jffs2_evict_inode() on inode removing. |
aa98d7cf | 598 | When an inode with XATTR is removed, those XATTRs must be removed. */ |
8a13695c | 599 | struct jffs2_xattr_ref *ref, *_ref; |
aa98d7cf | 600 | |
27c72b04 | 601 | if (!ic || ic->pino_nlink > 0) |
aa98d7cf KK |
602 | return; |
603 | ||
604 | down_write(&c->xattr_sem); | |
8a13695c KK |
605 | for (ref = ic->xref; ref; ref = _ref) { |
606 | _ref = ref->next; | |
607 | delete_xattr_ref(c, ref); | |
8f2b6f49 | 608 | } |
8a13695c | 609 | ic->xref = NULL; |
aa98d7cf KK |
610 | up_write(&c->xattr_sem); |
611 | } | |
612 | ||
613 | void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) | |
614 | { | |
615 | /* It's called from jffs2_free_ino_caches() until unmounting FS. */ | |
616 | struct jffs2_xattr_datum *xd; | |
617 | struct jffs2_xattr_ref *ref, *_ref; | |
618 | ||
619 | down_write(&c->xattr_sem); | |
8f2b6f49 KK |
620 | for (ref = ic->xref; ref; ref = _ref) { |
621 | _ref = ref->next; | |
aa98d7cf | 622 | xd = ref->xd; |
2c887e23 | 623 | if (atomic_dec_and_test(&xd->refcnt)) { |
aa98d7cf KK |
624 | unload_xattr_datum(c, xd); |
625 | jffs2_free_xattr_datum(xd); | |
626 | } | |
627 | jffs2_free_xattr_ref(ref); | |
628 | } | |
8f2b6f49 | 629 | ic->xref = NULL; |
aa98d7cf KK |
630 | up_write(&c->xattr_sem); |
631 | } | |
632 | ||
8f2b6f49 | 633 | static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
aa98d7cf | 634 | { |
a4ce96ac | 635 | /* success of check_xattr_ref_inode() means that inode (ic) dose not have |
aa98d7cf KK |
636 | * duplicate name/value pairs. If duplicate name/value pair would be found, |
637 | * one will be removed. | |
638 | */ | |
c9f700f8 | 639 | struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; |
aa98d7cf KK |
640 | int rc = 0; |
641 | ||
642 | if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) | |
643 | return 0; | |
644 | down_write(&c->xattr_sem); | |
645 | retry: | |
646 | rc = 0; | |
8f2b6f49 | 647 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
648 | if (!ref->xd->xname) { |
649 | rc = load_xattr_datum(c, ref->xd); | |
650 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 651 | *pref = ref->next; |
8a13695c | 652 | delete_xattr_ref(c, ref); |
aa98d7cf KK |
653 | goto retry; |
654 | } else if (unlikely(rc < 0)) | |
655 | goto out; | |
656 | } | |
c9f700f8 | 657 | for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { |
aa98d7cf KK |
658 | if (!cmp->xd->xname) { |
659 | ref->xd->flags |= JFFS2_XFLAGS_BIND; | |
660 | rc = load_xattr_datum(c, cmp->xd); | |
661 | ref->xd->flags &= ~JFFS2_XFLAGS_BIND; | |
662 | if (unlikely(rc > 0)) { | |
c9f700f8 | 663 | *pcmp = cmp->next; |
8a13695c | 664 | delete_xattr_ref(c, cmp); |
aa98d7cf KK |
665 | goto retry; |
666 | } else if (unlikely(rc < 0)) | |
667 | goto out; | |
668 | } | |
669 | if (ref->xd->xprefix == cmp->xd->xprefix | |
670 | && !strcmp(ref->xd->xname, cmp->xd->xname)) { | |
c9f700f8 KK |
671 | if (ref->xseqno > cmp->xseqno) { |
672 | *pcmp = cmp->next; | |
8a13695c | 673 | delete_xattr_ref(c, cmp); |
c9f700f8 KK |
674 | } else { |
675 | *pref = ref->next; | |
8a13695c | 676 | delete_xattr_ref(c, ref); |
c9f700f8 | 677 | } |
aa98d7cf KK |
678 | goto retry; |
679 | } | |
680 | } | |
681 | } | |
682 | ic->flags |= INO_FLAGS_XATTR_CHECKED; | |
683 | out: | |
684 | up_write(&c->xattr_sem); | |
685 | ||
686 | return rc; | |
687 | } | |
688 | ||
8c5a0366 JCD |
689 | void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
690 | { | |
691 | check_xattr_ref_inode(c, ic); | |
692 | } | |
693 | ||
aa98d7cf KK |
694 | /* -------- xattr subsystem functions --------------- |
695 | * jffs2_init_xattr_subsystem(c) | |
696 | * is used to initialize semaphore and list_head, and some variables. | |
697 | * jffs2_find_xattr_datum(c, xid) | |
698 | * is used to lookup xdatum while scanning process. | |
699 | * jffs2_clear_xattr_subsystem(c) | |
700 | * is used to release any xattr related objects. | |
701 | * jffs2_build_xattr_subsystem(c) | |
702 | * is used to associate xdatum and xref while super block building process. | |
703 | * jffs2_setup_xattr_datum(c, xid, version) | |
704 | * is used to insert xdatum while scanning process. | |
705 | * -------------------------------------------------- */ | |
706 | void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) | |
707 | { | |
708 | int i; | |
709 | ||
710 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) | |
711 | INIT_LIST_HEAD(&c->xattrindex[i]); | |
aa98d7cf | 712 | INIT_LIST_HEAD(&c->xattr_unchecked); |
c9f700f8 KK |
713 | INIT_LIST_HEAD(&c->xattr_dead_list); |
714 | c->xref_dead_list = NULL; | |
8f2b6f49 | 715 | c->xref_temp = NULL; |
aa98d7cf KK |
716 | |
717 | init_rwsem(&c->xattr_sem); | |
c9f700f8 KK |
718 | c->highest_xid = 0; |
719 | c->highest_xseqno = 0; | |
aa98d7cf KK |
720 | c->xdatum_mem_usage = 0; |
721 | c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ | |
722 | } | |
723 | ||
724 | static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) | |
725 | { | |
726 | struct jffs2_xattr_datum *xd; | |
727 | int i = xid % XATTRINDEX_HASHSIZE; | |
728 | ||
729 | /* It's only used in scanning/building process. */ | |
730 | BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); | |
731 | ||
732 | list_for_each_entry(xd, &c->xattrindex[i], xindex) { | |
733 | if (xd->xid==xid) | |
734 | return xd; | |
735 | } | |
736 | return NULL; | |
737 | } | |
738 | ||
739 | void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) | |
740 | { | |
741 | struct jffs2_xattr_datum *xd, *_xd; | |
742 | struct jffs2_xattr_ref *ref, *_ref; | |
743 | int i; | |
744 | ||
8f2b6f49 KK |
745 | for (ref=c->xref_temp; ref; ref = _ref) { |
746 | _ref = ref->next; | |
aa98d7cf | 747 | jffs2_free_xattr_ref(ref); |
8f2b6f49 | 748 | } |
c9f700f8 KK |
749 | |
750 | for (ref=c->xref_dead_list; ref; ref = _ref) { | |
751 | _ref = ref->next; | |
752 | jffs2_free_xattr_ref(ref); | |
753 | } | |
aa98d7cf KK |
754 | |
755 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { | |
756 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { | |
757 | list_del(&xd->xindex); | |
758 | if (xd->xname) | |
759 | kfree(xd->xname); | |
760 | jffs2_free_xattr_datum(xd); | |
761 | } | |
762 | } | |
c9f700f8 KK |
763 | |
764 | list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { | |
765 | list_del(&xd->xindex); | |
766 | jffs2_free_xattr_datum(xd); | |
767 | } | |
2ad8ee71 DW |
768 | list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { |
769 | list_del(&xd->xindex); | |
770 | jffs2_free_xattr_datum(xd); | |
771 | } | |
aa98d7cf KK |
772 | } |
773 | ||
c9f700f8 | 774 | #define XREF_TMPHASH_SIZE (128) |
aa98d7cf KK |
775 | void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) |
776 | { | |
777 | struct jffs2_xattr_ref *ref, *_ref; | |
c9f700f8 | 778 | struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; |
aa98d7cf KK |
779 | struct jffs2_xattr_datum *xd, *_xd; |
780 | struct jffs2_inode_cache *ic; | |
c9f700f8 KK |
781 | struct jffs2_raw_node_ref *raw; |
782 | int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; | |
8a13695c | 783 | int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; |
aa98d7cf KK |
784 | |
785 | BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); | |
786 | ||
8a13695c | 787 | /* Phase.1 : Merge same xref */ |
c9f700f8 KK |
788 | for (i=0; i < XREF_TMPHASH_SIZE; i++) |
789 | xref_tmphash[i] = NULL; | |
8f2b6f49 | 790 | for (ref=c->xref_temp; ref; ref=_ref) { |
c9f700f8 KK |
791 | struct jffs2_xattr_ref *tmp; |
792 | ||
8f2b6f49 | 793 | _ref = ref->next; |
aa98d7cf KK |
794 | if (ref_flags(ref->node) != REF_PRISTINE) { |
795 | if (verify_xattr_ref(c, ref)) { | |
c9f700f8 KK |
796 | BUG_ON(ref->node->next_in_ino != (void *)ref); |
797 | ref->node->next_in_ino = NULL; | |
798 | jffs2_mark_node_obsolete(c, ref->node); | |
aa98d7cf KK |
799 | jffs2_free_xattr_ref(ref); |
800 | continue; | |
801 | } | |
802 | } | |
c9f700f8 KK |
803 | |
804 | i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; | |
805 | for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { | |
806 | if (tmp->ino == ref->ino && tmp->xid == ref->xid) | |
807 | break; | |
808 | } | |
809 | if (tmp) { | |
810 | raw = ref->node; | |
811 | if (ref->xseqno > tmp->xseqno) { | |
812 | tmp->xseqno = ref->xseqno; | |
813 | raw->next_in_ino = tmp->node; | |
814 | tmp->node = raw; | |
815 | } else { | |
816 | raw->next_in_ino = tmp->node->next_in_ino; | |
817 | tmp->node->next_in_ino = raw; | |
818 | } | |
aa98d7cf KK |
819 | jffs2_free_xattr_ref(ref); |
820 | continue; | |
c9f700f8 KK |
821 | } else { |
822 | ref->next = xref_tmphash[i]; | |
823 | xref_tmphash[i] = ref; | |
aa98d7cf | 824 | } |
aa98d7cf | 825 | } |
8f2b6f49 | 826 | c->xref_temp = NULL; |
aa98d7cf | 827 | |
8a13695c | 828 | /* Phase.2 : Bind xref with inode_cache and xattr_datum */ |
c9f700f8 KK |
829 | for (i=0; i < XREF_TMPHASH_SIZE; i++) { |
830 | for (ref=xref_tmphash[i]; ref; ref=_ref) { | |
8a13695c | 831 | xref_count++; |
c9f700f8 KK |
832 | _ref = ref->next; |
833 | if (is_xattr_ref_dead(ref)) { | |
834 | ref->next = c->xref_dead_list; | |
835 | c->xref_dead_list = ref; | |
8a13695c | 836 | xref_dead_count++; |
c9f700f8 KK |
837 | continue; |
838 | } | |
839 | /* At this point, ref->xid and ref->ino contain XID and inode number. | |
840 | ref->xd and ref->ic are not valid yet. */ | |
841 | xd = jffs2_find_xattr_datum(c, ref->xid); | |
842 | ic = jffs2_get_ino_cache(c, ref->ino); | |
27c72b04 | 843 | if (!xd || !ic || !ic->pino_nlink) { |
8a13695c KK |
844 | dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", |
845 | ref->ino, ref->xid, ref->xseqno); | |
846 | ref->xseqno |= XREF_DELETE_MARKER; | |
c9f700f8 KK |
847 | ref->next = c->xref_dead_list; |
848 | c->xref_dead_list = ref; | |
8a13695c | 849 | xref_orphan_count++; |
c9f700f8 KK |
850 | continue; |
851 | } | |
852 | ref->xd = xd; | |
853 | ref->ic = ic; | |
2c887e23 | 854 | atomic_inc(&xd->refcnt); |
c9f700f8 KK |
855 | ref->next = ic->xref; |
856 | ic->xref = ref; | |
c9f700f8 KK |
857 | } |
858 | } | |
859 | ||
8a13695c | 860 | /* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ |
aa98d7cf KK |
861 | for (i=0; i < XATTRINDEX_HASHSIZE; i++) { |
862 | list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { | |
8a13695c | 863 | xdatum_count++; |
aa98d7cf | 864 | list_del_init(&xd->xindex); |
2c887e23 | 865 | if (!atomic_read(&xd->refcnt)) { |
8a13695c KK |
866 | dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", |
867 | xd->xid, xd->version); | |
868 | xd->flags |= JFFS2_XFLAGS_DEAD; | |
c9f700f8 | 869 | list_add(&xd->xindex, &c->xattr_unchecked); |
8a13695c | 870 | xdatum_orphan_count++; |
aa98d7cf KK |
871 | continue; |
872 | } | |
c9f700f8 KK |
873 | if (is_xattr_datum_unchecked(c, xd)) { |
874 | dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", | |
875 | xd->xid, xd->version); | |
aa98d7cf KK |
876 | list_add(&xd->xindex, &c->xattr_unchecked); |
877 | xdatum_unchecked_count++; | |
878 | } | |
aa98d7cf KK |
879 | } |
880 | } | |
881 | /* build complete */ | |
8a13695c KK |
882 | JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" |
883 | " (%u unchecked, %u orphan) and " | |
884 | "%u of xref (%u dead, %u orphan) found.\n", | |
885 | xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, | |
886 | xref_count, xref_dead_count, xref_orphan_count); | |
aa98d7cf KK |
887 | } |
888 | ||
889 | struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, | |
890 | uint32_t xid, uint32_t version) | |
891 | { | |
c9f700f8 | 892 | struct jffs2_xattr_datum *xd; |
aa98d7cf | 893 | |
c9f700f8 KK |
894 | xd = jffs2_find_xattr_datum(c, xid); |
895 | if (!xd) { | |
896 | xd = jffs2_alloc_xattr_datum(); | |
897 | if (!xd) | |
898 | return ERR_PTR(-ENOMEM); | |
899 | xd->xid = xid; | |
900 | xd->version = version; | |
901 | if (xd->xid > c->highest_xid) | |
902 | c->highest_xid = xd->xid; | |
903 | list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); | |
aa98d7cf KK |
904 | } |
905 | return xd; | |
906 | } | |
907 | ||
908 | /* -------- xattr subsystem functions --------------- | |
909 | * xprefix_to_handler(xprefix) | |
910 | * is used to translate xprefix into xattr_handler. | |
911 | * jffs2_listxattr(dentry, buffer, size) | |
912 | * is an implementation of listxattr handler on jffs2. | |
913 | * do_jffs2_getxattr(inode, xprefix, xname, buffer, size) | |
914 | * is an implementation of getxattr handler on jffs2. | |
915 | * do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) | |
916 | * is an implementation of setxattr handler on jffs2. | |
917 | * -------------------------------------------------- */ | |
365f0cb9 | 918 | const struct xattr_handler *jffs2_xattr_handlers[] = { |
aa98d7cf KK |
919 | &jffs2_user_xattr_handler, |
920 | #ifdef CONFIG_JFFS2_FS_SECURITY | |
921 | &jffs2_security_xattr_handler, | |
922 | #endif | |
923 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
924 | &jffs2_acl_access_xattr_handler, | |
925 | &jffs2_acl_default_xattr_handler, | |
926 | #endif | |
927 | &jffs2_trusted_xattr_handler, | |
928 | NULL | |
929 | }; | |
930 | ||
365f0cb9 SH |
931 | static const struct xattr_handler *xprefix_to_handler(int xprefix) { |
932 | const struct xattr_handler *ret; | |
aa98d7cf KK |
933 | |
934 | switch (xprefix) { | |
935 | case JFFS2_XPREFIX_USER: | |
936 | ret = &jffs2_user_xattr_handler; | |
937 | break; | |
938 | #ifdef CONFIG_JFFS2_FS_SECURITY | |
939 | case JFFS2_XPREFIX_SECURITY: | |
940 | ret = &jffs2_security_xattr_handler; | |
941 | break; | |
942 | #endif | |
943 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
944 | case JFFS2_XPREFIX_ACL_ACCESS: | |
945 | ret = &jffs2_acl_access_xattr_handler; | |
946 | break; | |
947 | case JFFS2_XPREFIX_ACL_DEFAULT: | |
948 | ret = &jffs2_acl_default_xattr_handler; | |
949 | break; | |
950 | #endif | |
951 | case JFFS2_XPREFIX_TRUSTED: | |
952 | ret = &jffs2_trusted_xattr_handler; | |
953 | break; | |
954 | default: | |
955 | ret = NULL; | |
956 | break; | |
957 | } | |
958 | return ret; | |
959 | } | |
960 | ||
961 | ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) | |
962 | { | |
963 | struct inode *inode = dentry->d_inode; | |
964 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
965 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
966 | struct jffs2_inode_cache *ic = f->inocache; | |
8f2b6f49 | 967 | struct jffs2_xattr_ref *ref, **pref; |
aa98d7cf | 968 | struct jffs2_xattr_datum *xd; |
365f0cb9 | 969 | const struct xattr_handler *xhandle; |
aa98d7cf KK |
970 | ssize_t len, rc; |
971 | int retry = 0; | |
972 | ||
8f2b6f49 | 973 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
974 | if (unlikely(rc)) |
975 | return rc; | |
976 | ||
977 | down_read(&c->xattr_sem); | |
978 | retry: | |
979 | len = 0; | |
8f2b6f49 | 980 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
981 | BUG_ON(ref->ic != ic); |
982 | xd = ref->xd; | |
983 | if (!xd->xname) { | |
984 | /* xdatum is unchached */ | |
985 | if (!retry) { | |
986 | retry = 1; | |
987 | up_read(&c->xattr_sem); | |
988 | down_write(&c->xattr_sem); | |
989 | goto retry; | |
990 | } else { | |
991 | rc = load_xattr_datum(c, xd); | |
992 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 993 | *pref = ref->next; |
8a13695c | 994 | delete_xattr_ref(c, ref); |
aa98d7cf KK |
995 | goto retry; |
996 | } else if (unlikely(rc < 0)) | |
997 | goto out; | |
998 | } | |
999 | } | |
1000 | xhandle = xprefix_to_handler(xd->xprefix); | |
1001 | if (!xhandle) | |
1002 | continue; | |
1003 | if (buffer) { | |
431547b3 CH |
1004 | rc = xhandle->list(dentry, buffer+len, size-len, |
1005 | xd->xname, xd->name_len, xd->flags); | |
aa98d7cf | 1006 | } else { |
431547b3 CH |
1007 | rc = xhandle->list(dentry, NULL, 0, xd->xname, |
1008 | xd->name_len, xd->flags); | |
aa98d7cf KK |
1009 | } |
1010 | if (rc < 0) | |
1011 | goto out; | |
1012 | len += rc; | |
1013 | } | |
1014 | rc = len; | |
1015 | out: | |
1016 | if (!retry) { | |
1017 | up_read(&c->xattr_sem); | |
1018 | } else { | |
1019 | up_write(&c->xattr_sem); | |
1020 | } | |
1021 | return rc; | |
1022 | } | |
1023 | ||
1024 | int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, | |
1025 | char *buffer, size_t size) | |
1026 | { | |
1027 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1028 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
1029 | struct jffs2_inode_cache *ic = f->inocache; | |
1030 | struct jffs2_xattr_datum *xd; | |
8f2b6f49 | 1031 | struct jffs2_xattr_ref *ref, **pref; |
aa98d7cf KK |
1032 | int rc, retry = 0; |
1033 | ||
8f2b6f49 | 1034 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
1035 | if (unlikely(rc)) |
1036 | return rc; | |
1037 | ||
1038 | down_read(&c->xattr_sem); | |
1039 | retry: | |
8f2b6f49 | 1040 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
1041 | BUG_ON(ref->ic!=ic); |
1042 | ||
1043 | xd = ref->xd; | |
1044 | if (xd->xprefix != xprefix) | |
1045 | continue; | |
1046 | if (!xd->xname) { | |
1047 | /* xdatum is unchached */ | |
1048 | if (!retry) { | |
1049 | retry = 1; | |
1050 | up_read(&c->xattr_sem); | |
1051 | down_write(&c->xattr_sem); | |
1052 | goto retry; | |
1053 | } else { | |
1054 | rc = load_xattr_datum(c, xd); | |
1055 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 1056 | *pref = ref->next; |
8a13695c | 1057 | delete_xattr_ref(c, ref); |
aa98d7cf KK |
1058 | goto retry; |
1059 | } else if (unlikely(rc < 0)) { | |
1060 | goto out; | |
1061 | } | |
1062 | } | |
1063 | } | |
1064 | if (!strcmp(xname, xd->xname)) { | |
1065 | rc = xd->value_len; | |
1066 | if (buffer) { | |
1067 | if (size < rc) { | |
1068 | rc = -ERANGE; | |
1069 | } else { | |
1070 | memcpy(buffer, xd->xvalue, rc); | |
1071 | } | |
1072 | } | |
1073 | goto out; | |
1074 | } | |
1075 | } | |
1076 | rc = -ENODATA; | |
1077 | out: | |
1078 | if (!retry) { | |
1079 | up_read(&c->xattr_sem); | |
1080 | } else { | |
1081 | up_write(&c->xattr_sem); | |
1082 | } | |
1083 | return rc; | |
1084 | } | |
1085 | ||
1086 | int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, | |
1087 | const char *buffer, size_t size, int flags) | |
1088 | { | |
1089 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1090 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
1091 | struct jffs2_inode_cache *ic = f->inocache; | |
1092 | struct jffs2_xattr_datum *xd; | |
8f2b6f49 | 1093 | struct jffs2_xattr_ref *ref, *newref, **pref; |
9fe4854c | 1094 | uint32_t length, request; |
aa98d7cf KK |
1095 | int rc; |
1096 | ||
8f2b6f49 | 1097 | rc = check_xattr_ref_inode(c, ic); |
aa98d7cf KK |
1098 | if (unlikely(rc)) |
1099 | return rc; | |
1100 | ||
1101 | request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); | |
9fe4854c | 1102 | rc = jffs2_reserve_space(c, request, &length, |
aa98d7cf KK |
1103 | ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); |
1104 | if (rc) { | |
1105 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); | |
1106 | return rc; | |
1107 | } | |
1108 | ||
1109 | /* Find existing xattr */ | |
1110 | down_write(&c->xattr_sem); | |
1111 | retry: | |
8f2b6f49 | 1112 | for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
aa98d7cf KK |
1113 | xd = ref->xd; |
1114 | if (xd->xprefix != xprefix) | |
1115 | continue; | |
1116 | if (!xd->xname) { | |
1117 | rc = load_xattr_datum(c, xd); | |
1118 | if (unlikely(rc > 0)) { | |
8f2b6f49 | 1119 | *pref = ref->next; |
8a13695c | 1120 | delete_xattr_ref(c, ref); |
aa98d7cf KK |
1121 | goto retry; |
1122 | } else if (unlikely(rc < 0)) | |
1123 | goto out; | |
1124 | } | |
1125 | if (!strcmp(xd->xname, xname)) { | |
1126 | if (flags & XATTR_CREATE) { | |
1127 | rc = -EEXIST; | |
1128 | goto out; | |
1129 | } | |
1130 | if (!buffer) { | |
8a13695c KK |
1131 | ref->ino = ic->ino; |
1132 | ref->xid = xd->xid; | |
1133 | ref->xseqno |= XREF_DELETE_MARKER; | |
1134 | rc = save_xattr_ref(c, ref); | |
1135 | if (!rc) { | |
1136 | *pref = ref->next; | |
1137 | spin_lock(&c->erase_completion_lock); | |
1138 | ref->next = c->xref_dead_list; | |
1139 | c->xref_dead_list = ref; | |
1140 | spin_unlock(&c->erase_completion_lock); | |
c6e8c6cc | 1141 | unrefer_xattr_datum(c, xd); |
8a13695c KK |
1142 | } else { |
1143 | ref->ic = ic; | |
1144 | ref->xd = xd; | |
1145 | ref->xseqno &= ~XREF_DELETE_MARKER; | |
1146 | } | |
aa98d7cf KK |
1147 | goto out; |
1148 | } | |
1149 | goto found; | |
1150 | } | |
1151 | } | |
1152 | /* not found */ | |
aa98d7cf KK |
1153 | if (flags & XATTR_REPLACE) { |
1154 | rc = -ENODATA; | |
1155 | goto out; | |
1156 | } | |
1157 | if (!buffer) { | |
c9f700f8 | 1158 | rc = -ENODATA; |
aa98d7cf KK |
1159 | goto out; |
1160 | } | |
1161 | found: | |
9fe4854c | 1162 | xd = create_xattr_datum(c, xprefix, xname, buffer, size); |
aa98d7cf KK |
1163 | if (IS_ERR(xd)) { |
1164 | rc = PTR_ERR(xd); | |
1165 | goto out; | |
1166 | } | |
1167 | up_write(&c->xattr_sem); | |
1168 | jffs2_complete_reservation(c); | |
1169 | ||
1170 | /* create xattr_ref */ | |
1171 | request = PAD(sizeof(struct jffs2_raw_xref)); | |
9fe4854c | 1172 | rc = jffs2_reserve_space(c, request, &length, |
aa98d7cf | 1173 | ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); |
c9f700f8 | 1174 | down_write(&c->xattr_sem); |
aa98d7cf KK |
1175 | if (rc) { |
1176 | JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); | |
c6e8c6cc | 1177 | unrefer_xattr_datum(c, xd); |
aa98d7cf KK |
1178 | up_write(&c->xattr_sem); |
1179 | return rc; | |
1180 | } | |
8f2b6f49 KK |
1181 | if (ref) |
1182 | *pref = ref->next; | |
9fe4854c | 1183 | newref = create_xattr_ref(c, ic, xd); |
aa98d7cf | 1184 | if (IS_ERR(newref)) { |
8f2b6f49 KK |
1185 | if (ref) { |
1186 | ref->next = ic->xref; | |
1187 | ic->xref = ref; | |
1188 | } | |
aa98d7cf | 1189 | rc = PTR_ERR(newref); |
c6e8c6cc | 1190 | unrefer_xattr_datum(c, xd); |
aa98d7cf | 1191 | } else if (ref) { |
8a13695c | 1192 | delete_xattr_ref(c, ref); |
aa98d7cf KK |
1193 | } |
1194 | out: | |
1195 | up_write(&c->xattr_sem); | |
1196 | jffs2_complete_reservation(c); | |
1197 | return rc; | |
1198 | } | |
1199 | ||
1200 | /* -------- garbage collector functions ------------- | |
c9f700f8 | 1201 | * jffs2_garbage_collect_xattr_datum(c, xd, raw) |
aa98d7cf | 1202 | * is used to move xdatum into new node. |
c9f700f8 | 1203 | * jffs2_garbage_collect_xattr_ref(c, ref, raw) |
aa98d7cf | 1204 | * is used to move xref into new node. |
aa98d7cf KK |
1205 | * jffs2_verify_xattr(c) |
1206 | * is used to call do_verify_xattr_datum() before garbage collecting. | |
8a13695c KK |
1207 | * jffs2_release_xattr_datum(c, xd) |
1208 | * is used to release an in-memory object of xdatum. | |
1209 | * jffs2_release_xattr_ref(c, ref) | |
1210 | * is used to release an in-memory object of xref. | |
aa98d7cf | 1211 | * -------------------------------------------------- */ |
c9f700f8 KK |
1212 | int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, |
1213 | struct jffs2_raw_node_ref *raw) | |
aa98d7cf | 1214 | { |
9fe4854c | 1215 | uint32_t totlen, length, old_ofs; |
c9f700f8 | 1216 | int rc = 0; |
aa98d7cf | 1217 | |
084702e0 | 1218 | down_write(&c->xattr_sem); |
c9f700f8 KK |
1219 | if (xd->node != raw) |
1220 | goto out; | |
8a13695c | 1221 | if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) |
c9f700f8 | 1222 | goto out; |
aa98d7cf | 1223 | |
8a13695c KK |
1224 | rc = load_xattr_datum(c, xd); |
1225 | if (unlikely(rc)) { | |
1226 | rc = (rc > 0) ? 0 : rc; | |
1227 | goto out; | |
aa98d7cf | 1228 | } |
8a13695c KK |
1229 | old_ofs = ref_offset(xd->node); |
1230 | totlen = PAD(sizeof(struct jffs2_raw_xattr) | |
1231 | + xd->name_len + 1 + xd->value_len); | |
9fe4854c | 1232 | rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); |
c9f700f8 KK |
1233 | if (rc) { |
1234 | JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); | |
084702e0 | 1235 | goto out; |
aa98d7cf | 1236 | } |
9fe4854c | 1237 | rc = save_xattr_datum(c, xd); |
aa98d7cf KK |
1238 | if (!rc) |
1239 | dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", | |
1240 | xd->xid, xd->version, old_ofs, ref_offset(xd->node)); | |
084702e0 | 1241 | out: |
c9f700f8 KK |
1242 | if (!rc) |
1243 | jffs2_mark_node_obsolete(c, raw); | |
084702e0 | 1244 | up_write(&c->xattr_sem); |
aa98d7cf KK |
1245 | return rc; |
1246 | } | |
1247 | ||
c9f700f8 KK |
1248 | int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, |
1249 | struct jffs2_raw_node_ref *raw) | |
aa98d7cf | 1250 | { |
9fe4854c | 1251 | uint32_t totlen, length, old_ofs; |
c9f700f8 | 1252 | int rc = 0; |
aa98d7cf | 1253 | |
084702e0 | 1254 | down_write(&c->xattr_sem); |
aa98d7cf KK |
1255 | BUG_ON(!ref->node); |
1256 | ||
c9f700f8 KK |
1257 | if (ref->node != raw) |
1258 | goto out; | |
1259 | if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) | |
1260 | goto out; | |
1261 | ||
aa98d7cf KK |
1262 | old_ofs = ref_offset(ref->node); |
1263 | totlen = ref_totlen(c, c->gcblock, ref->node); | |
084702e0 | 1264 | |
9fe4854c | 1265 | rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); |
c9f700f8 KK |
1266 | if (rc) { |
1267 | JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", | |
8e24eea7 | 1268 | __func__, rc, totlen); |
084702e0 KK |
1269 | rc = rc ? rc : -EBADFD; |
1270 | goto out; | |
aa98d7cf | 1271 | } |
9fe4854c | 1272 | rc = save_xattr_ref(c, ref); |
aa98d7cf KK |
1273 | if (!rc) |
1274 | dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", | |
1275 | ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); | |
084702e0 | 1276 | out: |
c9f700f8 KK |
1277 | if (!rc) |
1278 | jffs2_mark_node_obsolete(c, raw); | |
084702e0 | 1279 | up_write(&c->xattr_sem); |
aa98d7cf KK |
1280 | return rc; |
1281 | } | |
1282 | ||
aa98d7cf KK |
1283 | int jffs2_verify_xattr(struct jffs2_sb_info *c) |
1284 | { | |
1285 | struct jffs2_xattr_datum *xd, *_xd; | |
c9f700f8 KK |
1286 | struct jffs2_eraseblock *jeb; |
1287 | struct jffs2_raw_node_ref *raw; | |
1288 | uint32_t totlen; | |
aa98d7cf KK |
1289 | int rc; |
1290 | ||
1291 | down_write(&c->xattr_sem); | |
1292 | list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { | |
1293 | rc = do_verify_xattr_datum(c, xd); | |
c9f700f8 KK |
1294 | if (rc < 0) |
1295 | continue; | |
1296 | list_del_init(&xd->xindex); | |
1297 | spin_lock(&c->erase_completion_lock); | |
1298 | for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { | |
1299 | if (ref_flags(raw) != REF_UNCHECKED) | |
1300 | continue; | |
1301 | jeb = &c->blocks[ref_offset(raw) / c->sector_size]; | |
1302 | totlen = PAD(ref_totlen(c, jeb, raw)); | |
1303 | c->unchecked_size -= totlen; c->used_size += totlen; | |
1304 | jeb->unchecked_size -= totlen; jeb->used_size += totlen; | |
1305 | raw->flash_offset = ref_offset(raw) | |
1306 | | ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); | |
aa98d7cf | 1307 | } |
8a13695c | 1308 | if (xd->flags & JFFS2_XFLAGS_DEAD) |
c9f700f8 KK |
1309 | list_add(&xd->xindex, &c->xattr_dead_list); |
1310 | spin_unlock(&c->erase_completion_lock); | |
aa98d7cf KK |
1311 | } |
1312 | up_write(&c->xattr_sem); | |
aa98d7cf KK |
1313 | return list_empty(&c->xattr_unchecked) ? 1 : 0; |
1314 | } | |
c9f700f8 KK |
1315 | |
1316 | void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) | |
1317 | { | |
1318 | /* must be called under spin_lock(&c->erase_completion_lock) */ | |
2c887e23 | 1319 | if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) |
c9f700f8 KK |
1320 | return; |
1321 | ||
1322 | list_del(&xd->xindex); | |
1323 | jffs2_free_xattr_datum(xd); | |
1324 | } | |
1325 | ||
1326 | void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) | |
1327 | { | |
1328 | /* must be called under spin_lock(&c->erase_completion_lock) */ | |
1329 | struct jffs2_xattr_ref *tmp, **ptmp; | |
1330 | ||
1331 | if (ref->node != (void *)ref) | |
1332 | return; | |
1333 | ||
1334 | for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { | |
1335 | if (ref == tmp) { | |
1336 | *ptmp = tmp->next; | |
c9f700f8 KK |
1337 | break; |
1338 | } | |
1339 | } | |
8a13695c | 1340 | jffs2_free_xattr_ref(ref); |
c9f700f8 | 1341 | } |