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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-08 07:40:45 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-08 07:40:45 -0400
commite9eca4de957ac33744fb994ccacd4a5102e445a8 (patch)
treefc1cf7c808d3daa365a56856321834d030fcf10d /drivers/mtd
parent1929041bd8afeb3995b7c68d6f16e03422848a4c (diff)
parent76ac66e469f084d41742ba08923de76fbdc7dce3 (diff)
Merge tag 'upstream-3.7-rc1-fastmap' of git://git.infradead.org/linux-ubi
Pull UBI fastmap changes from Artem Bityutskiy: "This pull request contains the UBI fastmap support implemented by Richard Weinberger from Linutronix. Fastmap is designed to address UBI's slow scanning issues. Namely, it introduces a new on-flash data-structure called "fastmap", which stores the information about logical<->physical eraseblocks mappings. So now to get this information just read the fastmap, instead of doing full scan. More information here can be found in Richard's announcement in LKML (Subject: UBI: Fastmap request for inclusion (v19)): http://thread.gmane.org/gmane.linux.kernel/1364922/focus=1369109 One thing I want to explicitly say is that fastmap did not have large enough linux-next exposure. It is partially my fault - I did not respond quickly enough. I _really_ apologize for this. But it had good testing and disabled by default, so I do not expect that we'll break anything. Fastmap is declared as experimental so far, and it is off by default. We did declare that the on-flash format may be changed. The reason for this is that no one used it in real production so far, so there is a high risk that something is missing. Besides, we do not have user-space tools supporting fastmap so far. Nevertheless, I suggest we merge this feature. Many people want UBI's scanning bottleneck to be fixed and merging fastmap now should accelerate its production use. The plan is to make it bullet-prove, somewhat clean-up, and make it the default for UBI. I do not know how many kernel releases will it take. Basically, I what I want to do for fastmap is something like Linus did for btrfs few years ago." * tag 'upstream-3.7-rc1-fastmap' of git://git.infradead.org/linux-ubi: UBI: Wire-up fastmap UBI: Add fastmap core UBI: Add fastmap support to the WL sub-system UBI: Add fastmap stuff to attach.c UBI: Wire-up ->fm_sem UBI: Add fastmap bits to build.c UBI: Add self_check_eba() UBI: Export next_sqnum() UBI: Add fastmap stuff to ubi.h UBI: Add fastmap on-flash data structures
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/ubi/Kconfig21
-rw-r--r--drivers/mtd/ubi/Makefile1
-rw-r--r--drivers/mtd/ubi/attach.c386
-rw-r--r--drivers/mtd/ubi/build.c70
-rw-r--r--drivers/mtd/ubi/eba.c126
-rw-r--r--drivers/mtd/ubi/fastmap.c1537
-rw-r--r--drivers/mtd/ubi/ubi-media.h137
-rw-r--r--drivers/mtd/ubi/ubi.h118
-rw-r--r--drivers/mtd/ubi/wl.c599
9 files changed, 2784 insertions, 211 deletions
diff --git a/drivers/mtd/ubi/Kconfig b/drivers/mtd/ubi/Kconfig
index 271a842f8c39..36663af56d89 100644
--- a/drivers/mtd/ubi/Kconfig
+++ b/drivers/mtd/ubi/Kconfig
@@ -56,6 +56,27 @@ config MTD_UBI_BEB_LIMIT
56 56
57 Leave the default value if unsure. 57 Leave the default value if unsure.
58 58
59config MTD_UBI_FASTMAP
60 bool "UBI Fastmap (Experimental feature)"
61 default n
62 help
63 Important: this feature is experimental so far and the on-flash
64 format for fastmap may change in the next kernel versions
65
66 Fastmap is a mechanism which allows attaching an UBI device
67 in nearly constant time. Instead of scanning the whole MTD device it
68 only has to locate a checkpoint (called fastmap) on the device.
69 The on-flash fastmap contains all information needed to attach
70 the device. Using fastmap makes only sense on large devices where
71 attaching by scanning takes long. UBI will not automatically install
72 a fastmap on old images, but you can set the UBI module parameter
73 fm_autoconvert to 1 if you want so. Please note that fastmap-enabled
74 images are still usable with UBI implementations without
75 fastmap support. On typical flash devices the whole fastmap fits
76 into one PEB. UBI will reserve PEBs to hold two fastmaps.
77
78 If in doubt, say "N".
79
59config MTD_UBI_GLUEBI 80config MTD_UBI_GLUEBI
60 tristate "MTD devices emulation driver (gluebi)" 81 tristate "MTD devices emulation driver (gluebi)"
61 help 82 help
diff --git a/drivers/mtd/ubi/Makefile b/drivers/mtd/ubi/Makefile
index a0803ac74712..b46b0c978581 100644
--- a/drivers/mtd/ubi/Makefile
+++ b/drivers/mtd/ubi/Makefile
@@ -2,5 +2,6 @@ obj-$(CONFIG_MTD_UBI) += ubi.o
2 2
3ubi-y += vtbl.o vmt.o upd.o build.o cdev.o kapi.o eba.o io.o wl.o attach.o 3ubi-y += vtbl.o vmt.o upd.o build.o cdev.o kapi.o eba.o io.o wl.o attach.o
4ubi-y += misc.o debug.o 4ubi-y += misc.o debug.o
5ubi-$(CONFIG_MTD_UBI_FASTMAP) += fastmap.o
5 6
6obj-$(CONFIG_MTD_UBI_GLUEBI) += gluebi.o 7obj-$(CONFIG_MTD_UBI_GLUEBI) += gluebi.o
diff --git a/drivers/mtd/ubi/attach.c b/drivers/mtd/ubi/attach.c
index f7adf53e4f45..fec406b4553d 100644
--- a/drivers/mtd/ubi/attach.c
+++ b/drivers/mtd/ubi/attach.c
@@ -300,7 +300,7 @@ static struct ubi_ainf_volume *add_volume(struct ubi_attach_info *ai,
300} 300}
301 301
302/** 302/**
303 * compare_lebs - find out which logical eraseblock is newer. 303 * ubi_compare_lebs - find out which logical eraseblock is newer.
304 * @ubi: UBI device description object 304 * @ubi: UBI device description object
305 * @aeb: first logical eraseblock to compare 305 * @aeb: first logical eraseblock to compare
306 * @pnum: physical eraseblock number of the second logical eraseblock to 306 * @pnum: physical eraseblock number of the second logical eraseblock to
@@ -319,7 +319,7 @@ static struct ubi_ainf_volume *add_volume(struct ubi_attach_info *ai,
319 * o bit 2 is cleared: the older LEB is not corrupted; 319 * o bit 2 is cleared: the older LEB is not corrupted;
320 * o bit 2 is set: the older LEB is corrupted. 320 * o bit 2 is set: the older LEB is corrupted.
321 */ 321 */
322static int compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb, 322int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
323 int pnum, const struct ubi_vid_hdr *vid_hdr) 323 int pnum, const struct ubi_vid_hdr *vid_hdr)
324{ 324{
325 void *buf; 325 void *buf;
@@ -337,7 +337,7 @@ static int compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
337 * support these images anymore. Well, those images still work, 337 * support these images anymore. Well, those images still work,
338 * but only if no unclean reboots happened. 338 * but only if no unclean reboots happened.
339 */ 339 */
340 ubi_err("unsupported on-flash UBI format\n"); 340 ubi_err("unsupported on-flash UBI format");
341 return -EINVAL; 341 return -EINVAL;
342 } 342 }
343 343
@@ -507,7 +507,7 @@ int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
507 * sequence numbers. We still can attach these images, unless 507 * sequence numbers. We still can attach these images, unless
508 * there is a need to distinguish between old and new 508 * there is a need to distinguish between old and new
509 * eraseblocks, in which case we'll refuse the image in 509 * eraseblocks, in which case we'll refuse the image in
510 * 'compare_lebs()'. In other words, we attach old clean 510 * 'ubi_compare_lebs()'. In other words, we attach old clean
511 * images, but refuse attaching old images with duplicated 511 * images, but refuse attaching old images with duplicated
512 * logical eraseblocks because there was an unclean reboot. 512 * logical eraseblocks because there was an unclean reboot.
513 */ 513 */
@@ -523,7 +523,7 @@ int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
523 * Now we have to drop the older one and preserve the newer 523 * Now we have to drop the older one and preserve the newer
524 * one. 524 * one.
525 */ 525 */
526 cmp_res = compare_lebs(ubi, aeb, pnum, vid_hdr); 526 cmp_res = ubi_compare_lebs(ubi, aeb, pnum, vid_hdr);
527 if (cmp_res < 0) 527 if (cmp_res < 0)
528 return cmp_res; 528 return cmp_res;
529 529
@@ -748,7 +748,7 @@ struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi,
748/** 748/**
749 * check_corruption - check the data area of PEB. 749 * check_corruption - check the data area of PEB.
750 * @ubi: UBI device description object 750 * @ubi: UBI device description object
751 * @vid_hrd: the (corrupted) VID header of this PEB 751 * @vid_hdr: the (corrupted) VID header of this PEB
752 * @pnum: the physical eraseblock number to check 752 * @pnum: the physical eraseblock number to check
753 * 753 *
754 * This is a helper function which is used to distinguish between VID header 754 * This is a helper function which is used to distinguish between VID header
@@ -810,6 +810,8 @@ out_unlock:
810 * @ubi: UBI device description object 810 * @ubi: UBI device description object
811 * @ai: attaching information 811 * @ai: attaching information
812 * @pnum: the physical eraseblock number 812 * @pnum: the physical eraseblock number
813 * @vid: The volume ID of the found volume will be stored in this pointer
814 * @sqnum: The sqnum of the found volume will be stored in this pointer
813 * 815 *
814 * This function reads UBI headers of PEB @pnum, checks them, and adds 816 * This function reads UBI headers of PEB @pnum, checks them, and adds
815 * information about this PEB to the corresponding list or RB-tree in the 817 * information about this PEB to the corresponding list or RB-tree in the
@@ -817,10 +819,10 @@ out_unlock:
817 * successfully handled and a negative error code in case of failure. 819 * successfully handled and a negative error code in case of failure.
818 */ 820 */
819static int scan_peb(struct ubi_device *ubi, struct ubi_attach_info *ai, 821static int scan_peb(struct ubi_device *ubi, struct ubi_attach_info *ai,
820 int pnum) 822 int pnum, int *vid, unsigned long long *sqnum)
821{ 823{
822 long long uninitialized_var(ec); 824 long long uninitialized_var(ec);
823 int err, bitflips = 0, vol_id, ec_err = 0; 825 int err, bitflips = 0, vol_id = -1, ec_err = 0;
824 826
825 dbg_bld("scan PEB %d", pnum); 827 dbg_bld("scan PEB %d", pnum);
826 828
@@ -991,14 +993,21 @@ static int scan_peb(struct ubi_device *ubi, struct ubi_attach_info *ai,
991 } 993 }
992 994
993 vol_id = be32_to_cpu(vidh->vol_id); 995 vol_id = be32_to_cpu(vidh->vol_id);
996 if (vid)
997 *vid = vol_id;
998 if (sqnum)
999 *sqnum = be64_to_cpu(vidh->sqnum);
994 if (vol_id > UBI_MAX_VOLUMES && vol_id != UBI_LAYOUT_VOLUME_ID) { 1000 if (vol_id > UBI_MAX_VOLUMES && vol_id != UBI_LAYOUT_VOLUME_ID) {
995 int lnum = be32_to_cpu(vidh->lnum); 1001 int lnum = be32_to_cpu(vidh->lnum);
996 1002
997 /* Unsupported internal volume */ 1003 /* Unsupported internal volume */
998 switch (vidh->compat) { 1004 switch (vidh->compat) {
999 case UBI_COMPAT_DELETE: 1005 case UBI_COMPAT_DELETE:
1000 ubi_msg("\"delete\" compatible internal volume %d:%d found, will remove it", 1006 if (vol_id != UBI_FM_SB_VOLUME_ID
1001 vol_id, lnum); 1007 && vol_id != UBI_FM_DATA_VOLUME_ID) {
1008 ubi_msg("\"delete\" compatible internal volume %d:%d found, will remove it",
1009 vol_id, lnum);
1010 }
1002 err = add_to_list(ai, pnum, vol_id, lnum, 1011 err = add_to_list(ai, pnum, vol_id, lnum,
1003 ec, 1, &ai->erase); 1012 ec, 1, &ai->erase);
1004 if (err) 1013 if (err)
@@ -1121,51 +1130,126 @@ static int late_analysis(struct ubi_device *ubi, struct ubi_attach_info *ai)
1121} 1130}
1122 1131
1123/** 1132/**
1133 * destroy_av - free volume attaching information.
1134 * @av: volume attaching information
1135 * @ai: attaching information
1136 *
1137 * This function destroys the volume attaching information.
1138 */
1139static void destroy_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av)
1140{
1141 struct ubi_ainf_peb *aeb;
1142 struct rb_node *this = av->root.rb_node;
1143
1144 while (this) {
1145 if (this->rb_left)
1146 this = this->rb_left;
1147 else if (this->rb_right)
1148 this = this->rb_right;
1149 else {
1150 aeb = rb_entry(this, struct ubi_ainf_peb, u.rb);
1151 this = rb_parent(this);
1152 if (this) {
1153 if (this->rb_left == &aeb->u.rb)
1154 this->rb_left = NULL;
1155 else
1156 this->rb_right = NULL;
1157 }
1158
1159 kmem_cache_free(ai->aeb_slab_cache, aeb);
1160 }
1161 }
1162 kfree(av);
1163}
1164
1165/**
1166 * destroy_ai - destroy attaching information.
1167 * @ai: attaching information
1168 */
1169static void destroy_ai(struct ubi_attach_info *ai)
1170{
1171 struct ubi_ainf_peb *aeb, *aeb_tmp;
1172 struct ubi_ainf_volume *av;
1173 struct rb_node *rb;
1174
1175 list_for_each_entry_safe(aeb, aeb_tmp, &ai->alien, u.list) {
1176 list_del(&aeb->u.list);
1177 kmem_cache_free(ai->aeb_slab_cache, aeb);
1178 }
1179 list_for_each_entry_safe(aeb, aeb_tmp, &ai->erase, u.list) {
1180 list_del(&aeb->u.list);
1181 kmem_cache_free(ai->aeb_slab_cache, aeb);
1182 }
1183 list_for_each_entry_safe(aeb, aeb_tmp, &ai->corr, u.list) {
1184 list_del(&aeb->u.list);
1185 kmem_cache_free(ai->aeb_slab_cache, aeb);
1186 }
1187 list_for_each_entry_safe(aeb, aeb_tmp, &ai->free, u.list) {
1188 list_del(&aeb->u.list);
1189 kmem_cache_free(ai->aeb_slab_cache, aeb);
1190 }
1191
1192 /* Destroy the volume RB-tree */
1193 rb = ai->volumes.rb_node;
1194 while (rb) {
1195 if (rb->rb_left)
1196 rb = rb->rb_left;
1197 else if (rb->rb_right)
1198 rb = rb->rb_right;
1199 else {
1200 av = rb_entry(rb, struct ubi_ainf_volume, rb);
1201
1202 rb = rb_parent(rb);
1203 if (rb) {
1204 if (rb->rb_left == &av->rb)
1205 rb->rb_left = NULL;
1206 else
1207 rb->rb_right = NULL;
1208 }
1209
1210 destroy_av(ai, av);
1211 }
1212 }
1213
1214 if (ai->aeb_slab_cache)
1215 kmem_cache_destroy(ai->aeb_slab_cache);
1216
1217 kfree(ai);
1218}
1219
1220/**
1124 * scan_all - scan entire MTD device. 1221 * scan_all - scan entire MTD device.
1125 * @ubi: UBI device description object 1222 * @ubi: UBI device description object
1223 * @ai: attach info object
1224 * @start: start scanning at this PEB
1126 * 1225 *
1127 * This function does full scanning of an MTD device and returns complete 1226 * This function does full scanning of an MTD device and returns complete
1128 * information about it in form of a "struct ubi_attach_info" object. In case 1227 * information about it in form of a "struct ubi_attach_info" object. In case
1129 * of failure, an error code is returned. 1228 * of failure, an error code is returned.
1130 */ 1229 */
1131static struct ubi_attach_info *scan_all(struct ubi_device *ubi) 1230static int scan_all(struct ubi_device *ubi, struct ubi_attach_info *ai,
1231 int start)
1132{ 1232{
1133 int err, pnum; 1233 int err, pnum;
1134 struct rb_node *rb1, *rb2; 1234 struct rb_node *rb1, *rb2;
1135 struct ubi_ainf_volume *av; 1235 struct ubi_ainf_volume *av;
1136 struct ubi_ainf_peb *aeb; 1236 struct ubi_ainf_peb *aeb;
1137 struct ubi_attach_info *ai;
1138
1139 ai = kzalloc(sizeof(struct ubi_attach_info), GFP_KERNEL);
1140 if (!ai)
1141 return ERR_PTR(-ENOMEM);
1142
1143 INIT_LIST_HEAD(&ai->corr);
1144 INIT_LIST_HEAD(&ai->free);
1145 INIT_LIST_HEAD(&ai->erase);
1146 INIT_LIST_HEAD(&ai->alien);
1147 ai->volumes = RB_ROOT;
1148 1237
1149 err = -ENOMEM; 1238 err = -ENOMEM;
1150 ai->aeb_slab_cache = kmem_cache_create("ubi_aeb_slab_cache",
1151 sizeof(struct ubi_ainf_peb),
1152 0, 0, NULL);
1153 if (!ai->aeb_slab_cache)
1154 goto out_ai;
1155 1239
1156 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); 1240 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
1157 if (!ech) 1241 if (!ech)
1158 goto out_ai; 1242 return err;
1159 1243
1160 vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); 1244 vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
1161 if (!vidh) 1245 if (!vidh)
1162 goto out_ech; 1246 goto out_ech;
1163 1247
1164 for (pnum = 0; pnum < ubi->peb_count; pnum++) { 1248 for (pnum = start; pnum < ubi->peb_count; pnum++) {
1165 cond_resched(); 1249 cond_resched();
1166 1250
1167 dbg_gen("process PEB %d", pnum); 1251 dbg_gen("process PEB %d", pnum);
1168 err = scan_peb(ubi, ai, pnum); 1252 err = scan_peb(ubi, ai, pnum, NULL, NULL);
1169 if (err < 0) 1253 if (err < 0)
1170 goto out_vidh; 1254 goto out_vidh;
1171 } 1255 }
@@ -1210,32 +1294,144 @@ static struct ubi_attach_info *scan_all(struct ubi_device *ubi)
1210 ubi_free_vid_hdr(ubi, vidh); 1294 ubi_free_vid_hdr(ubi, vidh);
1211 kfree(ech); 1295 kfree(ech);
1212 1296
1213 return ai; 1297 return 0;
1214 1298
1215out_vidh: 1299out_vidh:
1216 ubi_free_vid_hdr(ubi, vidh); 1300 ubi_free_vid_hdr(ubi, vidh);
1217out_ech: 1301out_ech:
1218 kfree(ech); 1302 kfree(ech);
1219out_ai: 1303 return err;
1220 ubi_destroy_ai(ai); 1304}
1221 return ERR_PTR(err); 1305
1306#ifdef CONFIG_MTD_UBI_FASTMAP
1307
1308/**
1309 * scan_fastmap - try to find a fastmap and attach from it.
1310 * @ubi: UBI device description object
1311 * @ai: attach info object
1312 *
1313 * Returns 0 on success, negative return values indicate an internal
1314 * error.
1315 * UBI_NO_FASTMAP denotes that no fastmap was found.
1316 * UBI_BAD_FASTMAP denotes that the found fastmap was invalid.
1317 */
1318static int scan_fast(struct ubi_device *ubi, struct ubi_attach_info *ai)
1319{
1320 int err, pnum, fm_anchor = -1;
1321 unsigned long long max_sqnum = 0;
1322
1323 err = -ENOMEM;
1324
1325 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
1326 if (!ech)
1327 goto out;
1328
1329 vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
1330 if (!vidh)
1331 goto out_ech;
1332
1333 for (pnum = 0; pnum < UBI_FM_MAX_START; pnum++) {
1334 int vol_id = -1;
1335 unsigned long long sqnum = -1;
1336 cond_resched();
1337
1338 dbg_gen("process PEB %d", pnum);
1339 err = scan_peb(ubi, ai, pnum, &vol_id, &sqnum);
1340 if (err < 0)
1341 goto out_vidh;
1342
1343 if (vol_id == UBI_FM_SB_VOLUME_ID && sqnum > max_sqnum) {
1344 max_sqnum = sqnum;
1345 fm_anchor = pnum;
1346 }
1347 }
1348
1349 ubi_free_vid_hdr(ubi, vidh);
1350 kfree(ech);
1351
1352 if (fm_anchor < 0)
1353 return UBI_NO_FASTMAP;
1354
1355 return ubi_scan_fastmap(ubi, ai, fm_anchor);
1356
1357out_vidh:
1358 ubi_free_vid_hdr(ubi, vidh);
1359out_ech:
1360 kfree(ech);
1361out:
1362 return err;
1363}
1364
1365#endif
1366
1367static struct ubi_attach_info *alloc_ai(const char *slab_name)
1368{
1369 struct ubi_attach_info *ai;
1370
1371 ai = kzalloc(sizeof(struct ubi_attach_info), GFP_KERNEL);
1372 if (!ai)
1373 return ai;
1374
1375 INIT_LIST_HEAD(&ai->corr);
1376 INIT_LIST_HEAD(&ai->free);
1377 INIT_LIST_HEAD(&ai->erase);
1378 INIT_LIST_HEAD(&ai->alien);
1379 ai->volumes = RB_ROOT;
1380 ai->aeb_slab_cache = kmem_cache_create(slab_name,
1381 sizeof(struct ubi_ainf_peb),
1382 0, 0, NULL);
1383 if (!ai->aeb_slab_cache) {
1384 kfree(ai);
1385 ai = NULL;
1386 }
1387
1388 return ai;
1222} 1389}
1223 1390
1224/** 1391/**
1225 * ubi_attach - attach an MTD device. 1392 * ubi_attach - attach an MTD device.
1226 * @ubi: UBI device descriptor 1393 * @ubi: UBI device descriptor
1394 * @force_scan: if set to non-zero attach by scanning
1227 * 1395 *
1228 * This function returns zero in case of success and a negative error code in 1396 * This function returns zero in case of success and a negative error code in
1229 * case of failure. 1397 * case of failure.
1230 */ 1398 */
1231int ubi_attach(struct ubi_device *ubi) 1399int ubi_attach(struct ubi_device *ubi, int force_scan)
1232{ 1400{
1233 int err; 1401 int err;
1234 struct ubi_attach_info *ai; 1402 struct ubi_attach_info *ai;
1235 1403
1236 ai = scan_all(ubi); 1404 ai = alloc_ai("ubi_aeb_slab_cache");
1237 if (IS_ERR(ai)) 1405 if (!ai)
1238 return PTR_ERR(ai); 1406 return -ENOMEM;
1407
1408#ifdef CONFIG_MTD_UBI_FASTMAP
1409 /* On small flash devices we disable fastmap in any case. */
1410 if ((int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) <= UBI_FM_MAX_START) {
1411 ubi->fm_disabled = 1;
1412 force_scan = 1;
1413 }
1414
1415 if (force_scan)
1416 err = scan_all(ubi, ai, 0);
1417 else {
1418 err = scan_fast(ubi, ai);
1419 if (err > 0) {
1420 if (err != UBI_NO_FASTMAP) {
1421 destroy_ai(ai);
1422 ai = alloc_ai("ubi_aeb_slab_cache2");
1423 if (!ai)
1424 return -ENOMEM;
1425 }
1426
1427 err = scan_all(ubi, ai, UBI_FM_MAX_START);
1428 }
1429 }
1430#else
1431 err = scan_all(ubi, ai, 0);
1432#endif
1433 if (err)
1434 goto out_ai;
1239 1435
1240 ubi->bad_peb_count = ai->bad_peb_count; 1436 ubi->bad_peb_count = ai->bad_peb_count;
1241 ubi->good_peb_count = ubi->peb_count - ubi->bad_peb_count; 1437 ubi->good_peb_count = ubi->peb_count - ubi->bad_peb_count;
@@ -1256,7 +1452,29 @@ int ubi_attach(struct ubi_device *ubi)
1256 if (err) 1452 if (err)
1257 goto out_wl; 1453 goto out_wl;
1258 1454
1259 ubi_destroy_ai(ai); 1455#ifdef CONFIG_MTD_UBI_FASTMAP
1456 if (ubi->fm && ubi->dbg->chk_gen) {
1457 struct ubi_attach_info *scan_ai;
1458
1459 scan_ai = alloc_ai("ubi_ckh_aeb_slab_cache");
1460 if (!scan_ai)
1461 goto out_wl;
1462
1463 err = scan_all(ubi, scan_ai, 0);
1464 if (err) {
1465 destroy_ai(scan_ai);
1466 goto out_wl;
1467 }
1468
1469 err = self_check_eba(ubi, ai, scan_ai);
1470 destroy_ai(scan_ai);
1471
1472 if (err)
1473 goto out_wl;
1474 }
1475#endif
1476
1477 destroy_ai(ai);
1260 return 0; 1478 return 0;
1261 1479
1262out_wl: 1480out_wl:
@@ -1265,99 +1483,11 @@ out_vtbl:
1265 ubi_free_internal_volumes(ubi); 1483 ubi_free_internal_volumes(ubi);
1266 vfree(ubi->vtbl); 1484 vfree(ubi->vtbl);
1267out_ai: 1485out_ai:
1268 ubi_destroy_ai(ai); 1486 destroy_ai(ai);
1269 return err; 1487 return err;
1270} 1488}
1271 1489
1272/** 1490/**
1273 * destroy_av - free volume attaching information.
1274 * @av: volume attaching information
1275 * @ai: attaching information
1276 *
1277 * This function destroys the volume attaching information.
1278 */
1279static void destroy_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av)
1280{
1281 struct ubi_ainf_peb *aeb;
1282 struct rb_node *this = av->root.rb_node;
1283
1284 while (this) {
1285 if (this->rb_left)
1286 this = this->rb_left;
1287 else if (this->rb_right)
1288 this = this->rb_right;
1289 else {
1290 aeb = rb_entry(this, struct ubi_ainf_peb, u.rb);
1291 this = rb_parent(this);
1292 if (this) {
1293 if (this->rb_left == &aeb->u.rb)
1294 this->rb_left = NULL;
1295 else
1296 this->rb_right = NULL;
1297 }
1298
1299 kmem_cache_free(ai->aeb_slab_cache, aeb);
1300 }
1301 }
1302 kfree(av);
1303}
1304
1305/**
1306 * ubi_destroy_ai - destroy attaching information.
1307 * @ai: attaching information
1308 */
1309void ubi_destroy_ai(struct ubi_attach_info *ai)
1310{
1311 struct ubi_ainf_peb *aeb, *aeb_tmp;
1312 struct ubi_ainf_volume *av;
1313 struct rb_node *rb;
1314
1315 list_for_each_entry_safe(aeb, aeb_tmp, &ai->alien, u.list) {
1316 list_del(&aeb->u.list);
1317 kmem_cache_free(ai->aeb_slab_cache, aeb);
1318 }
1319 list_for_each_entry_safe(aeb, aeb_tmp, &ai->erase, u.list) {
1320 list_del(&aeb->u.list);
1321 kmem_cache_free(ai->aeb_slab_cache, aeb);
1322 }
1323 list_for_each_entry_safe(aeb, aeb_tmp, &ai->corr, u.list) {
1324 list_del(&aeb->u.list);
1325 kmem_cache_free(ai->aeb_slab_cache, aeb);
1326 }
1327 list_for_each_entry_safe(aeb, aeb_tmp, &ai->free, u.list) {
1328 list_del(&aeb->u.list);
1329 kmem_cache_free(ai->aeb_slab_cache, aeb);
1330 }
1331
1332 /* Destroy the volume RB-tree */
1333 rb = ai->volumes.rb_node;
1334 while (rb) {
1335 if (rb->rb_left)
1336 rb = rb->rb_left;
1337 else if (rb->rb_right)
1338 rb = rb->rb_right;
1339 else {
1340 av = rb_entry(rb, struct ubi_ainf_volume, rb);
1341
1342 rb = rb_parent(rb);
1343 if (rb) {
1344 if (rb->rb_left == &av->rb)
1345 rb->rb_left = NULL;
1346 else
1347 rb->rb_right = NULL;
1348 }
1349
1350 destroy_av(ai, av);
1351 }
1352 }
1353
1354 if (ai->aeb_slab_cache)
1355 kmem_cache_destroy(ai->aeb_slab_cache);
1356
1357 kfree(ai);
1358}
1359
1360/**
1361 * self_check_ai - check the attaching information. 1491 * self_check_ai - check the attaching information.
1362 * @ubi: UBI device description object 1492 * @ubi: UBI device description object
1363 * @ai: attaching information 1493 * @ai: attaching information
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 34977039850c..344b4cb49d4e 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -76,7 +76,10 @@ static int __initdata mtd_devs;
76 76
77/* MTD devices specification parameters */ 77/* MTD devices specification parameters */
78static struct mtd_dev_param __initdata mtd_dev_param[UBI_MAX_DEVICES]; 78static struct mtd_dev_param __initdata mtd_dev_param[UBI_MAX_DEVICES];
79 79#ifdef CONFIG_MTD_UBI_FASTMAP
80/* UBI module parameter to enable fastmap automatically on non-fastmap images */
81static bool fm_autoconvert;
82#endif
80/* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */ 83/* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
81struct class *ubi_class; 84struct class *ubi_class;
82 85
@@ -153,6 +156,19 @@ int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype)
153 156
154 ubi_do_get_device_info(ubi, &nt.di); 157 ubi_do_get_device_info(ubi, &nt.di);
155 ubi_do_get_volume_info(ubi, vol, &nt.vi); 158 ubi_do_get_volume_info(ubi, vol, &nt.vi);
159
160#ifdef CONFIG_MTD_UBI_FASTMAP
161 switch (ntype) {
162 case UBI_VOLUME_ADDED:
163 case UBI_VOLUME_REMOVED:
164 case UBI_VOLUME_RESIZED:
165 case UBI_VOLUME_RENAMED:
166 if (ubi_update_fastmap(ubi)) {
167 ubi_err("Unable to update fastmap!");
168 ubi_ro_mode(ubi);
169 }
170 }
171#endif
156 return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt); 172 return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt);
157} 173}
158 174
@@ -918,10 +934,40 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
918 ubi->vid_hdr_offset = vid_hdr_offset; 934 ubi->vid_hdr_offset = vid_hdr_offset;
919 ubi->autoresize_vol_id = -1; 935 ubi->autoresize_vol_id = -1;
920 936
937#ifdef CONFIG_MTD_UBI_FASTMAP
938 ubi->fm_pool.used = ubi->fm_pool.size = 0;
939 ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0;
940
941 /*
942 * fm_pool.max_size is 5% of the total number of PEBs but it's also
943 * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE.
944 */
945 ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size,
946 ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE);
947 if (ubi->fm_pool.max_size < UBI_FM_MIN_POOL_SIZE)
948 ubi->fm_pool.max_size = UBI_FM_MIN_POOL_SIZE;
949
950 ubi->fm_wl_pool.max_size = UBI_FM_WL_POOL_SIZE;
951 ubi->fm_disabled = !fm_autoconvert;
952
953 if (!ubi->fm_disabled && (int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd)
954 <= UBI_FM_MAX_START) {
955 ubi_err("More than %i PEBs are needed for fastmap, sorry.",
956 UBI_FM_MAX_START);
957 ubi->fm_disabled = 1;
958 }
959
960 ubi_msg("default fastmap pool size: %d", ubi->fm_pool.max_size);
961 ubi_msg("default fastmap WL pool size: %d", ubi->fm_wl_pool.max_size);
962#else
963 ubi->fm_disabled = 1;
964#endif
921 mutex_init(&ubi->buf_mutex); 965 mutex_init(&ubi->buf_mutex);
922 mutex_init(&ubi->ckvol_mutex); 966 mutex_init(&ubi->ckvol_mutex);
923 mutex_init(&ubi->device_mutex); 967 mutex_init(&ubi->device_mutex);
924 spin_lock_init(&ubi->volumes_lock); 968 spin_lock_init(&ubi->volumes_lock);
969 mutex_init(&ubi->fm_mutex);
970 init_rwsem(&ubi->fm_sem);
925 971
926 ubi_msg("attaching mtd%d to ubi%d", mtd->index, ubi_num); 972 ubi_msg("attaching mtd%d to ubi%d", mtd->index, ubi_num);
927 973
@@ -934,11 +980,17 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
934 if (!ubi->peb_buf) 980 if (!ubi->peb_buf)
935 goto out_free; 981 goto out_free;
936 982
983#ifdef CONFIG_MTD_UBI_FASTMAP
984 ubi->fm_size = ubi_calc_fm_size(ubi);
985 ubi->fm_buf = vzalloc(ubi->fm_size);
986 if (!ubi->fm_buf)
987 goto out_free;
988#endif
937 err = ubi_debugging_init_dev(ubi); 989 err = ubi_debugging_init_dev(ubi);
938 if (err) 990 if (err)
939 goto out_free; 991 goto out_free;
940 992
941 err = ubi_attach(ubi); 993 err = ubi_attach(ubi, 0);
942 if (err) { 994 if (err) {
943 ubi_err("failed to attach mtd%d, error %d", mtd->index, err); 995 ubi_err("failed to attach mtd%d, error %d", mtd->index, err);
944 goto out_debugging; 996 goto out_debugging;
@@ -1012,6 +1064,7 @@ out_debugging:
1012 ubi_debugging_exit_dev(ubi); 1064 ubi_debugging_exit_dev(ubi);
1013out_free: 1065out_free:
1014 vfree(ubi->peb_buf); 1066 vfree(ubi->peb_buf);
1067 vfree(ubi->fm_buf);
1015 if (ref) 1068 if (ref)
1016 put_device(&ubi->dev); 1069 put_device(&ubi->dev);
1017 else 1070 else
@@ -1061,7 +1114,11 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
1061 ubi_assert(ubi_num == ubi->ubi_num); 1114 ubi_assert(ubi_num == ubi->ubi_num);
1062 ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL); 1115 ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL);
1063 ubi_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num); 1116 ubi_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
1064 1117#ifdef CONFIG_MTD_UBI_FASTMAP
1118 /* If we don't write a new fastmap at detach time we lose all
1119 * EC updates that have been made since the last written fastmap. */
1120 ubi_update_fastmap(ubi);
1121#endif
1065 /* 1122 /*
1066 * Before freeing anything, we have to stop the background thread to 1123 * Before freeing anything, we have to stop the background thread to
1067 * prevent it from doing anything on this device while we are freeing. 1124 * prevent it from doing anything on this device while we are freeing.
@@ -1077,12 +1134,14 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
1077 1134
1078 ubi_debugfs_exit_dev(ubi); 1135 ubi_debugfs_exit_dev(ubi);
1079 uif_close(ubi); 1136 uif_close(ubi);
1137
1080 ubi_wl_close(ubi); 1138 ubi_wl_close(ubi);
1081 ubi_free_internal_volumes(ubi); 1139 ubi_free_internal_volumes(ubi);
1082 vfree(ubi->vtbl); 1140 vfree(ubi->vtbl);
1083 put_mtd_device(ubi->mtd); 1141 put_mtd_device(ubi->mtd);
1084 ubi_debugging_exit_dev(ubi); 1142 ubi_debugging_exit_dev(ubi);
1085 vfree(ubi->peb_buf); 1143 vfree(ubi->peb_buf);
1144 vfree(ubi->fm_buf);
1086 ubi_msg("mtd%d is detached from ubi%d", ubi->mtd->index, ubi->ubi_num); 1145 ubi_msg("mtd%d is detached from ubi%d", ubi->mtd->index, ubi->ubi_num);
1087 put_device(&ubi->dev); 1146 put_device(&ubi->dev);
1088 return 0; 1147 return 0;
@@ -1404,7 +1463,10 @@ MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|pa
1404 "Example 2: mtd=content,1984 mtd=4 - attach MTD device with name \"content\" using VID header offset 1984, and MTD device number 4 with default VID header offset.\n" 1463 "Example 2: mtd=content,1984 mtd=4 - attach MTD device with name \"content\" using VID header offset 1984, and MTD device number 4 with default VID header offset.\n"
1405 "Example 3: mtd=/dev/mtd1,0,25 - attach MTD device /dev/mtd1 using default VID header offset and reserve 25*nand_size_in_blocks/1024 erase blocks for bad block handling.\n" 1464 "Example 3: mtd=/dev/mtd1,0,25 - attach MTD device /dev/mtd1 using default VID header offset and reserve 25*nand_size_in_blocks/1024 erase blocks for bad block handling.\n"
1406 "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device)."); 1465 "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device).");
1407 1466#ifdef CONFIG_MTD_UBI_FASTMAP
1467module_param(fm_autoconvert, bool, 0644);
1468MODULE_PARM_DESC(fm_autoconvert, "Set this parameter to enable fastmap automatically on images without a fastmap.");
1469#endif
1408MODULE_VERSION(__stringify(UBI_VERSION)); 1470MODULE_VERSION(__stringify(UBI_VERSION));
1409MODULE_DESCRIPTION("UBI - Unsorted Block Images"); 1471MODULE_DESCRIPTION("UBI - Unsorted Block Images");
1410MODULE_AUTHOR("Artem Bityutskiy"); 1472MODULE_AUTHOR("Artem Bityutskiy");
diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index a26d7d253174..0e11671dadc4 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -57,7 +57,7 @@
57 * global sequence counter value. It also increases the global sequence 57 * global sequence counter value. It also increases the global sequence
58 * counter. 58 * counter.
59 */ 59 */
60static unsigned long long next_sqnum(struct ubi_device *ubi) 60unsigned long long ubi_next_sqnum(struct ubi_device *ubi)
61{ 61{
62 unsigned long long sqnum; 62 unsigned long long sqnum;
63 63
@@ -340,7 +340,9 @@ int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
340 340
341 dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum); 341 dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum);
342 342
343 down_read(&ubi->fm_sem);
343 vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED; 344 vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED;
345 up_read(&ubi->fm_sem);
344 err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 0); 346 err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 0);
345 347
346out_unlock: 348out_unlock:
@@ -521,7 +523,7 @@ retry:
521 goto out_put; 523 goto out_put;
522 } 524 }
523 525
524 vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); 526 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
525 err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr); 527 err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr);
526 if (err) 528 if (err)
527 goto write_error; 529 goto write_error;
@@ -548,7 +550,9 @@ retry:
548 mutex_unlock(&ubi->buf_mutex); 550 mutex_unlock(&ubi->buf_mutex);
549 ubi_free_vid_hdr(ubi, vid_hdr); 551 ubi_free_vid_hdr(ubi, vid_hdr);
550 552
553 down_read(&ubi->fm_sem);
551 vol->eba_tbl[lnum] = new_pnum; 554 vol->eba_tbl[lnum] = new_pnum;
555 up_read(&ubi->fm_sem);
552 ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1); 556 ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
553 557
554 ubi_msg("data was successfully recovered"); 558 ubi_msg("data was successfully recovered");
@@ -632,7 +636,7 @@ int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
632 } 636 }
633 637
634 vid_hdr->vol_type = UBI_VID_DYNAMIC; 638 vid_hdr->vol_type = UBI_VID_DYNAMIC;
635 vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); 639 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
636 vid_hdr->vol_id = cpu_to_be32(vol_id); 640 vid_hdr->vol_id = cpu_to_be32(vol_id);
637 vid_hdr->lnum = cpu_to_be32(lnum); 641 vid_hdr->lnum = cpu_to_be32(lnum);
638 vid_hdr->compat = ubi_get_compat(ubi, vol_id); 642 vid_hdr->compat = ubi_get_compat(ubi, vol_id);
@@ -665,7 +669,9 @@ retry:
665 } 669 }
666 } 670 }
667 671
672 down_read(&ubi->fm_sem);
668 vol->eba_tbl[lnum] = pnum; 673 vol->eba_tbl[lnum] = pnum;
674 up_read(&ubi->fm_sem);
669 675
670 leb_write_unlock(ubi, vol_id, lnum); 676 leb_write_unlock(ubi, vol_id, lnum);
671 ubi_free_vid_hdr(ubi, vid_hdr); 677 ubi_free_vid_hdr(ubi, vid_hdr);
@@ -692,7 +698,7 @@ write_error:
692 return err; 698 return err;
693 } 699 }
694 700
695 vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); 701 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
696 ubi_msg("try another PEB"); 702 ubi_msg("try another PEB");
697 goto retry; 703 goto retry;
698} 704}
@@ -745,7 +751,7 @@ int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
745 return err; 751 return err;
746 } 752 }
747 753
748 vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); 754 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
749 vid_hdr->vol_id = cpu_to_be32(vol_id); 755 vid_hdr->vol_id = cpu_to_be32(vol_id);
750 vid_hdr->lnum = cpu_to_be32(lnum); 756 vid_hdr->lnum = cpu_to_be32(lnum);
751 vid_hdr->compat = ubi_get_compat(ubi, vol_id); 757 vid_hdr->compat = ubi_get_compat(ubi, vol_id);
@@ -783,7 +789,9 @@ retry:
783 } 789 }
784 790
785 ubi_assert(vol->eba_tbl[lnum] < 0); 791 ubi_assert(vol->eba_tbl[lnum] < 0);
792 down_read(&ubi->fm_sem);
786 vol->eba_tbl[lnum] = pnum; 793 vol->eba_tbl[lnum] = pnum;
794 up_read(&ubi->fm_sem);
787 795
788 leb_write_unlock(ubi, vol_id, lnum); 796 leb_write_unlock(ubi, vol_id, lnum);
789 ubi_free_vid_hdr(ubi, vid_hdr); 797 ubi_free_vid_hdr(ubi, vid_hdr);
@@ -810,7 +818,7 @@ write_error:
810 return err; 818 return err;
811 } 819 }
812 820
813 vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); 821 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
814 ubi_msg("try another PEB"); 822 ubi_msg("try another PEB");
815 goto retry; 823 goto retry;
816} 824}
@@ -862,7 +870,7 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
862 if (err) 870 if (err)
863 goto out_mutex; 871 goto out_mutex;
864 872
865 vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); 873 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
866 vid_hdr->vol_id = cpu_to_be32(vol_id); 874 vid_hdr->vol_id = cpu_to_be32(vol_id);
867 vid_hdr->lnum = cpu_to_be32(lnum); 875 vid_hdr->lnum = cpu_to_be32(lnum);
868 vid_hdr->compat = ubi_get_compat(ubi, vol_id); 876 vid_hdr->compat = ubi_get_compat(ubi, vol_id);
@@ -904,7 +912,9 @@ retry:
904 goto out_leb_unlock; 912 goto out_leb_unlock;
905 } 913 }
906 914
915 down_read(&ubi->fm_sem);
907 vol->eba_tbl[lnum] = pnum; 916 vol->eba_tbl[lnum] = pnum;
917 up_read(&ubi->fm_sem);
908 918
909out_leb_unlock: 919out_leb_unlock:
910 leb_write_unlock(ubi, vol_id, lnum); 920 leb_write_unlock(ubi, vol_id, lnum);
@@ -930,7 +940,7 @@ write_error:
930 goto out_leb_unlock; 940 goto out_leb_unlock;
931 } 941 }
932 942
933 vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); 943 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
934 ubi_msg("try another PEB"); 944 ubi_msg("try another PEB");
935 goto retry; 945 goto retry;
936} 946}
@@ -1089,7 +1099,7 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
1089 vid_hdr->data_size = cpu_to_be32(data_size); 1099 vid_hdr->data_size = cpu_to_be32(data_size);
1090 vid_hdr->data_crc = cpu_to_be32(crc); 1100 vid_hdr->data_crc = cpu_to_be32(crc);
1091 } 1101 }
1092 vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); 1102 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1093 1103
1094 err = ubi_io_write_vid_hdr(ubi, to, vid_hdr); 1104 err = ubi_io_write_vid_hdr(ubi, to, vid_hdr);
1095 if (err) { 1105 if (err) {
@@ -1151,7 +1161,9 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
1151 } 1161 }
1152 1162
1153 ubi_assert(vol->eba_tbl[lnum] == from); 1163 ubi_assert(vol->eba_tbl[lnum] == from);
1164 down_read(&ubi->fm_sem);
1154 vol->eba_tbl[lnum] = to; 1165 vol->eba_tbl[lnum] = to;
1166 up_read(&ubi->fm_sem);
1155 1167
1156out_unlock_buf: 1168out_unlock_buf:
1157 mutex_unlock(&ubi->buf_mutex); 1169 mutex_unlock(&ubi->buf_mutex);
@@ -1202,6 +1214,102 @@ static void print_rsvd_warning(struct ubi_device *ubi,
1202} 1214}
1203 1215
1204/** 1216/**
1217 * self_check_eba - run a self check on the EBA table constructed by fastmap.
1218 * @ubi: UBI device description object
1219 * @ai_fastmap: UBI attach info object created by fastmap
1220 * @ai_scan: UBI attach info object created by scanning
1221 *
1222 * Returns < 0 in case of an internal error, 0 otherwise.
1223 * If a bad EBA table entry was found it will be printed out and
1224 * ubi_assert() triggers.
1225 */
1226int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
1227 struct ubi_attach_info *ai_scan)
1228{
1229 int i, j, num_volumes, ret = 0;
1230 int **scan_eba, **fm_eba;
1231 struct ubi_ainf_volume *av;
1232 struct ubi_volume *vol;
1233 struct ubi_ainf_peb *aeb;
1234 struct rb_node *rb;
1235
1236 num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
1237
1238 scan_eba = kmalloc(sizeof(*scan_eba) * num_volumes, GFP_KERNEL);
1239 if (!scan_eba)
1240 return -ENOMEM;
1241
1242 fm_eba = kmalloc(sizeof(*fm_eba) * num_volumes, GFP_KERNEL);
1243 if (!fm_eba) {
1244 kfree(scan_eba);
1245 return -ENOMEM;
1246 }
1247
1248 for (i = 0; i < num_volumes; i++) {
1249 vol = ubi->volumes[i];
1250 if (!vol)
1251 continue;
1252
1253 scan_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**scan_eba),
1254 GFP_KERNEL);
1255 if (!scan_eba[i]) {
1256 ret = -ENOMEM;
1257 goto out_free;
1258 }
1259
1260 fm_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**fm_eba),
1261 GFP_KERNEL);
1262 if (!fm_eba[i]) {
1263 ret = -ENOMEM;
1264 goto out_free;
1265 }
1266
1267 for (j = 0; j < vol->reserved_pebs; j++)
1268 scan_eba[i][j] = fm_eba[i][j] = UBI_LEB_UNMAPPED;
1269
1270 av = ubi_find_av(ai_scan, idx2vol_id(ubi, i));
1271 if (!av)
1272 continue;
1273
1274 ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
1275 scan_eba[i][aeb->lnum] = aeb->pnum;
1276
1277 av = ubi_find_av(ai_fastmap, idx2vol_id(ubi, i));
1278 if (!av)
1279 continue;
1280
1281 ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
1282 fm_eba[i][aeb->lnum] = aeb->pnum;
1283
1284 for (j = 0; j < vol->reserved_pebs; j++) {
1285 if (scan_eba[i][j] != fm_eba[i][j]) {
1286 if (scan_eba[i][j] == UBI_LEB_UNMAPPED ||
1287 fm_eba[i][j] == UBI_LEB_UNMAPPED)
1288 continue;
1289
1290 ubi_err("LEB:%i:%i is PEB:%i instead of %i!",
1291 vol->vol_id, i, fm_eba[i][j],
1292 scan_eba[i][j]);
1293 ubi_assert(0);
1294 }
1295 }
1296 }
1297
1298out_free:
1299 for (i = 0; i < num_volumes; i++) {
1300 if (!ubi->volumes[i])
1301 continue;
1302
1303 kfree(scan_eba[i]);
1304 kfree(fm_eba[i]);
1305 }
1306
1307 kfree(scan_eba);
1308 kfree(fm_eba);
1309 return ret;
1310}
1311
1312/**
1205 * ubi_eba_init - initialize the EBA sub-system using attaching information. 1313 * ubi_eba_init - initialize the EBA sub-system using attaching information.
1206 * @ubi: UBI device description object 1314 * @ubi: UBI device description object
1207 * @ai: attaching information 1315 * @ai: attaching information
diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
new file mode 100644
index 000000000000..1a5f53c090d4
--- /dev/null
+++ b/drivers/mtd/ubi/fastmap.c
@@ -0,0 +1,1537 @@
1/*
2 * Copyright (c) 2012 Linutronix GmbH
3 * Author: Richard Weinberger <richard@nod.at>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 */
15
16#include <linux/crc32.h>
17#include "ubi.h"
18
19/**
20 * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device.
21 * @ubi: UBI device description object
22 */
23size_t ubi_calc_fm_size(struct ubi_device *ubi)
24{
25 size_t size;
26
27 size = sizeof(struct ubi_fm_hdr) + \
28 sizeof(struct ubi_fm_scan_pool) + \
29 sizeof(struct ubi_fm_scan_pool) + \
30 (ubi->peb_count * sizeof(struct ubi_fm_ec)) + \
31 (sizeof(struct ubi_fm_eba) + \
32 (ubi->peb_count * sizeof(__be32))) + \
33 sizeof(struct ubi_fm_volhdr) * UBI_MAX_VOLUMES;
34 return roundup(size, ubi->leb_size);
35}
36
37
38/**
39 * new_fm_vhdr - allocate a new volume header for fastmap usage.
40 * @ubi: UBI device description object
41 * @vol_id: the VID of the new header
42 *
43 * Returns a new struct ubi_vid_hdr on success.
44 * NULL indicates out of memory.
45 */
46static struct ubi_vid_hdr *new_fm_vhdr(struct ubi_device *ubi, int vol_id)
47{
48 struct ubi_vid_hdr *new;
49
50 new = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
51 if (!new)
52 goto out;
53
54 new->vol_type = UBI_VID_DYNAMIC;
55 new->vol_id = cpu_to_be32(vol_id);
56
57 /* UBI implementations without fastmap support have to delete the
58 * fastmap.
59 */
60 new->compat = UBI_COMPAT_DELETE;
61
62out:
63 return new;
64}
65
66/**
67 * add_aeb - create and add a attach erase block to a given list.
68 * @ai: UBI attach info object
69 * @list: the target list
70 * @pnum: PEB number of the new attach erase block
71 * @ec: erease counter of the new LEB
72 * @scrub: scrub this PEB after attaching
73 *
74 * Returns 0 on success, < 0 indicates an internal error.
75 */
76static int add_aeb(struct ubi_attach_info *ai, struct list_head *list,
77 int pnum, int ec, int scrub)
78{
79 struct ubi_ainf_peb *aeb;
80
81 aeb = kmem_cache_alloc(ai->aeb_slab_cache, GFP_KERNEL);
82 if (!aeb)
83 return -ENOMEM;
84
85 aeb->pnum = pnum;
86 aeb->ec = ec;
87 aeb->lnum = -1;
88 aeb->scrub = scrub;
89 aeb->copy_flag = aeb->sqnum = 0;
90
91 ai->ec_sum += aeb->ec;
92 ai->ec_count++;
93
94 if (ai->max_ec < aeb->ec)
95 ai->max_ec = aeb->ec;
96
97 if (ai->min_ec > aeb->ec)
98 ai->min_ec = aeb->ec;
99
100 list_add_tail(&aeb->u.list, list);
101
102 return 0;
103}
104
105/**
106 * add_vol - create and add a new volume to ubi_attach_info.
107 * @ai: ubi_attach_info object
108 * @vol_id: VID of the new volume
109 * @used_ebs: number of used EBS
110 * @data_pad: data padding value of the new volume
111 * @vol_type: volume type
112 * @last_eb_bytes: number of bytes in the last LEB
113 *
114 * Returns the new struct ubi_ainf_volume on success.
115 * NULL indicates an error.
116 */
117static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id,
118 int used_ebs, int data_pad, u8 vol_type,
119 int last_eb_bytes)
120{
121 struct ubi_ainf_volume *av;
122 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
123
124 while (*p) {
125 parent = *p;
126 av = rb_entry(parent, struct ubi_ainf_volume, rb);
127
128 if (vol_id > av->vol_id)
129 p = &(*p)->rb_left;
130 else if (vol_id > av->vol_id)
131 p = &(*p)->rb_right;
132 }
133
134 av = kmalloc(sizeof(struct ubi_ainf_volume), GFP_KERNEL);
135 if (!av)
136 goto out;
137
138 av->highest_lnum = av->leb_count = 0;
139 av->vol_id = vol_id;
140 av->used_ebs = used_ebs;
141 av->data_pad = data_pad;
142 av->last_data_size = last_eb_bytes;
143 av->compat = 0;
144 av->vol_type = vol_type;
145 av->root = RB_ROOT;
146
147 dbg_bld("found volume (ID %i)", vol_id);
148
149 rb_link_node(&av->rb, parent, p);
150 rb_insert_color(&av->rb, &ai->volumes);
151
152out:
153 return av;
154}
155
156/**
157 * assign_aeb_to_av - assigns a SEB to a given ainf_volume and removes it
158 * from it's original list.
159 * @ai: ubi_attach_info object
160 * @aeb: the to be assigned SEB
161 * @av: target scan volume
162 */
163static void assign_aeb_to_av(struct ubi_attach_info *ai,
164 struct ubi_ainf_peb *aeb,
165 struct ubi_ainf_volume *av)
166{
167 struct ubi_ainf_peb *tmp_aeb;
168 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
169
170 p = &av->root.rb_node;
171 while (*p) {
172 parent = *p;
173
174 tmp_aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
175 if (aeb->lnum != tmp_aeb->lnum) {
176 if (aeb->lnum < tmp_aeb->lnum)
177 p = &(*p)->rb_left;
178 else
179 p = &(*p)->rb_right;
180
181 continue;
182 } else
183 break;
184 }
185
186 list_del(&aeb->u.list);
187 av->leb_count++;
188
189 rb_link_node(&aeb->u.rb, parent, p);
190 rb_insert_color(&aeb->u.rb, &av->root);
191}
192
193/**
194 * update_vol - inserts or updates a LEB which was found a pool.
195 * @ubi: the UBI device object
196 * @ai: attach info object
197 * @av: the volume this LEB belongs to
198 * @new_vh: the volume header derived from new_aeb
199 * @new_aeb: the AEB to be examined
200 *
201 * Returns 0 on success, < 0 indicates an internal error.
202 */
203static int update_vol(struct ubi_device *ubi, struct ubi_attach_info *ai,
204 struct ubi_ainf_volume *av, struct ubi_vid_hdr *new_vh,
205 struct ubi_ainf_peb *new_aeb)
206{
207 struct rb_node **p = &av->root.rb_node, *parent = NULL;
208 struct ubi_ainf_peb *aeb, *victim;
209 int cmp_res;
210
211 while (*p) {
212 parent = *p;
213 aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
214
215 if (be32_to_cpu(new_vh->lnum) != aeb->lnum) {
216 if (be32_to_cpu(new_vh->lnum) < aeb->lnum)
217 p = &(*p)->rb_left;
218 else
219 p = &(*p)->rb_right;
220
221 continue;
222 }
223
224 /* This case can happen if the fastmap gets written
225 * because of a volume change (creation, deletion, ..).
226 * Then a PEB can be within the persistent EBA and the pool.
227 */
228 if (aeb->pnum == new_aeb->pnum) {
229 ubi_assert(aeb->lnum == new_aeb->lnum);
230 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
231
232 return 0;
233 }
234
235 cmp_res = ubi_compare_lebs(ubi, aeb, new_aeb->pnum, new_vh);
236 if (cmp_res < 0)
237 return cmp_res;
238
239 /* new_aeb is newer */
240 if (cmp_res & 1) {
241 victim = kmem_cache_alloc(ai->aeb_slab_cache,
242 GFP_KERNEL);
243 if (!victim)
244 return -ENOMEM;
245
246 victim->ec = aeb->ec;
247 victim->pnum = aeb->pnum;
248 list_add_tail(&victim->u.list, &ai->erase);
249
250 if (av->highest_lnum == be32_to_cpu(new_vh->lnum))
251 av->last_data_size = \
252 be32_to_cpu(new_vh->data_size);
253
254 dbg_bld("vol %i: AEB %i's PEB %i is the newer",
255 av->vol_id, aeb->lnum, new_aeb->pnum);
256
257 aeb->ec = new_aeb->ec;
258 aeb->pnum = new_aeb->pnum;
259 aeb->copy_flag = new_vh->copy_flag;
260 aeb->scrub = new_aeb->scrub;
261 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
262
263 /* new_aeb is older */
264 } else {
265 dbg_bld("vol %i: AEB %i's PEB %i is old, dropping it",
266 av->vol_id, aeb->lnum, new_aeb->pnum);
267 list_add_tail(&new_aeb->u.list, &ai->erase);
268 }
269
270 return 0;
271 }
272 /* This LEB is new, let's add it to the volume */
273
274 if (av->highest_lnum <= be32_to_cpu(new_vh->lnum)) {
275 av->highest_lnum = be32_to_cpu(new_vh->lnum);
276 av->last_data_size = be32_to_cpu(new_vh->data_size);
277 }
278
279 if (av->vol_type == UBI_STATIC_VOLUME)
280 av->used_ebs = be32_to_cpu(new_vh->used_ebs);
281
282 av->leb_count++;
283
284 rb_link_node(&new_aeb->u.rb, parent, p);
285 rb_insert_color(&new_aeb->u.rb, &av->root);
286
287 return 0;
288}
289
290/**
291 * process_pool_aeb - we found a non-empty PEB in a pool.
292 * @ubi: UBI device object
293 * @ai: attach info object
294 * @new_vh: the volume header derived from new_aeb
295 * @new_aeb: the AEB to be examined
296 *
297 * Returns 0 on success, < 0 indicates an internal error.
298 */
299static int process_pool_aeb(struct ubi_device *ubi, struct ubi_attach_info *ai,
300 struct ubi_vid_hdr *new_vh,
301 struct ubi_ainf_peb *new_aeb)
302{
303 struct ubi_ainf_volume *av, *tmp_av = NULL;
304 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
305 int found = 0;
306
307 if (be32_to_cpu(new_vh->vol_id) == UBI_FM_SB_VOLUME_ID ||
308 be32_to_cpu(new_vh->vol_id) == UBI_FM_DATA_VOLUME_ID) {
309 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
310
311 return 0;
312 }
313
314 /* Find the volume this SEB belongs to */
315 while (*p) {
316 parent = *p;
317 tmp_av = rb_entry(parent, struct ubi_ainf_volume, rb);
318
319 if (be32_to_cpu(new_vh->vol_id) > tmp_av->vol_id)
320 p = &(*p)->rb_left;
321 else if (be32_to_cpu(new_vh->vol_id) < tmp_av->vol_id)
322 p = &(*p)->rb_right;
323 else {
324 found = 1;
325 break;
326 }
327 }
328
329 if (found)
330 av = tmp_av;
331 else {
332 ubi_err("orphaned volume in fastmap pool!");
333 return UBI_BAD_FASTMAP;
334 }
335
336 ubi_assert(be32_to_cpu(new_vh->vol_id) == av->vol_id);
337
338 return update_vol(ubi, ai, av, new_vh, new_aeb);
339}
340
341/**
342 * unmap_peb - unmap a PEB.
343 * If fastmap detects a free PEB in the pool it has to check whether
344 * this PEB has been unmapped after writing the fastmap.
345 *
346 * @ai: UBI attach info object
347 * @pnum: The PEB to be unmapped
348 */
349static void unmap_peb(struct ubi_attach_info *ai, int pnum)
350{
351 struct ubi_ainf_volume *av;
352 struct rb_node *node, *node2;
353 struct ubi_ainf_peb *aeb;
354
355 for (node = rb_first(&ai->volumes); node; node = rb_next(node)) {
356 av = rb_entry(node, struct ubi_ainf_volume, rb);
357
358 for (node2 = rb_first(&av->root); node2;
359 node2 = rb_next(node2)) {
360 aeb = rb_entry(node2, struct ubi_ainf_peb, u.rb);
361 if (aeb->pnum == pnum) {
362 rb_erase(&aeb->u.rb, &av->root);
363 kmem_cache_free(ai->aeb_slab_cache, aeb);
364 return;
365 }
366 }
367 }
368}
369
370/**
371 * scan_pool - scans a pool for changed (no longer empty PEBs).
372 * @ubi: UBI device object
373 * @ai: attach info object
374 * @pebs: an array of all PEB numbers in the to be scanned pool
375 * @pool_size: size of the pool (number of entries in @pebs)
376 * @max_sqnum: pointer to the maximal sequence number
377 * @eba_orphans: list of PEBs which need to be scanned
378 * @free: list of PEBs which are most likely free (and go into @ai->free)
379 *
380 * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned.
381 * < 0 indicates an internal error.
382 */
383static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
384 int *pebs, int pool_size, unsigned long long *max_sqnum,
385 struct list_head *eba_orphans, struct list_head *free)
386{
387 struct ubi_vid_hdr *vh;
388 struct ubi_ec_hdr *ech;
389 struct ubi_ainf_peb *new_aeb, *tmp_aeb;
390 int i, pnum, err, found_orphan, ret = 0;
391
392 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
393 if (!ech)
394 return -ENOMEM;
395
396 vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
397 if (!vh) {
398 kfree(ech);
399 return -ENOMEM;
400 }
401
402 dbg_bld("scanning fastmap pool: size = %i", pool_size);
403
404 /*
405 * Now scan all PEBs in the pool to find changes which have been made
406 * after the creation of the fastmap
407 */
408 for (i = 0; i < pool_size; i++) {
409 int scrub = 0;
410
411 pnum = be32_to_cpu(pebs[i]);
412
413 if (ubi_io_is_bad(ubi, pnum)) {
414 ubi_err("bad PEB in fastmap pool!");
415 ret = UBI_BAD_FASTMAP;
416 goto out;
417 }
418
419 err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
420 if (err && err != UBI_IO_BITFLIPS) {
421 ubi_err("unable to read EC header! PEB:%i err:%i",
422 pnum, err);
423 ret = err > 0 ? UBI_BAD_FASTMAP : err;
424 goto out;
425 } else if (ret == UBI_IO_BITFLIPS)
426 scrub = 1;
427
428 if (be32_to_cpu(ech->image_seq) != ubi->image_seq) {
429 ubi_err("bad image seq: 0x%x, expected: 0x%x",
430 be32_to_cpu(ech->image_seq), ubi->image_seq);
431 err = UBI_BAD_FASTMAP;
432 goto out;
433 }
434
435 err = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
436 if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) {
437 unsigned long long ec = be64_to_cpu(ech->ec);
438 unmap_peb(ai, pnum);
439 dbg_bld("Adding PEB to free: %i", pnum);
440 if (err == UBI_IO_FF_BITFLIPS)
441 add_aeb(ai, free, pnum, ec, 1);
442 else
443 add_aeb(ai, free, pnum, ec, 0);
444 continue;
445 } else if (err == 0 || err == UBI_IO_BITFLIPS) {
446 dbg_bld("Found non empty PEB:%i in pool", pnum);
447
448 if (err == UBI_IO_BITFLIPS)
449 scrub = 1;
450
451 found_orphan = 0;
452 list_for_each_entry(tmp_aeb, eba_orphans, u.list) {
453 if (tmp_aeb->pnum == pnum) {
454 found_orphan = 1;
455 break;
456 }
457 }
458 if (found_orphan) {
459 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
460 list_del(&tmp_aeb->u.list);
461 }
462
463 new_aeb = kmem_cache_alloc(ai->aeb_slab_cache,
464 GFP_KERNEL);
465 if (!new_aeb) {
466 ret = -ENOMEM;
467 goto out;
468 }
469
470 new_aeb->ec = be64_to_cpu(ech->ec);
471 new_aeb->pnum = pnum;
472 new_aeb->lnum = be32_to_cpu(vh->lnum);
473 new_aeb->sqnum = be64_to_cpu(vh->sqnum);
474 new_aeb->copy_flag = vh->copy_flag;
475 new_aeb->scrub = scrub;
476
477 if (*max_sqnum < new_aeb->sqnum)
478 *max_sqnum = new_aeb->sqnum;
479
480 err = process_pool_aeb(ubi, ai, vh, new_aeb);
481 if (err) {
482 ret = err > 0 ? UBI_BAD_FASTMAP : err;
483 goto out;
484 }
485 } else {
486 /* We are paranoid and fall back to scanning mode */
487 ubi_err("fastmap pool PEBs contains damaged PEBs!");
488 ret = err > 0 ? UBI_BAD_FASTMAP : err;
489 goto out;
490 }
491
492 }
493
494out:
495 ubi_free_vid_hdr(ubi, vh);
496 kfree(ech);
497 return ret;
498}
499
500/**
501 * count_fastmap_pebs - Counts the PEBs found by fastmap.
502 * @ai: The UBI attach info object
503 */
504static int count_fastmap_pebs(struct ubi_attach_info *ai)
505{
506 struct ubi_ainf_peb *aeb;
507 struct ubi_ainf_volume *av;
508 struct rb_node *rb1, *rb2;
509 int n = 0;
510
511 list_for_each_entry(aeb, &ai->erase, u.list)
512 n++;
513
514 list_for_each_entry(aeb, &ai->free, u.list)
515 n++;
516
517 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb)
518 ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb)
519 n++;
520
521 return n;
522}
523
524/**
525 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap.
526 * @ubi: UBI device object
527 * @ai: UBI attach info object
528 * @fm: the fastmap to be attached
529 *
530 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable.
531 * < 0 indicates an internal error.
532 */
533static int ubi_attach_fastmap(struct ubi_device *ubi,
534 struct ubi_attach_info *ai,
535 struct ubi_fastmap_layout *fm)
536{
537 struct list_head used, eba_orphans, free;
538 struct ubi_ainf_volume *av;
539 struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb;
540 struct ubi_ec_hdr *ech;
541 struct ubi_fm_sb *fmsb;
542 struct ubi_fm_hdr *fmhdr;
543 struct ubi_fm_scan_pool *fmpl1, *fmpl2;
544 struct ubi_fm_ec *fmec;
545 struct ubi_fm_volhdr *fmvhdr;
546 struct ubi_fm_eba *fm_eba;
547 int ret, i, j, pool_size, wl_pool_size;
548 size_t fm_pos = 0, fm_size = ubi->fm_size;
549 unsigned long long max_sqnum = 0;
550 void *fm_raw = ubi->fm_buf;
551
552 INIT_LIST_HEAD(&used);
553 INIT_LIST_HEAD(&free);
554 INIT_LIST_HEAD(&eba_orphans);
555 INIT_LIST_HEAD(&ai->corr);
556 INIT_LIST_HEAD(&ai->free);
557 INIT_LIST_HEAD(&ai->erase);
558 INIT_LIST_HEAD(&ai->alien);
559 ai->volumes = RB_ROOT;
560 ai->min_ec = UBI_MAX_ERASECOUNTER;
561
562 ai->aeb_slab_cache = kmem_cache_create("ubi_ainf_peb_slab",
563 sizeof(struct ubi_ainf_peb),
564 0, 0, NULL);
565 if (!ai->aeb_slab_cache) {
566 ret = -ENOMEM;
567 goto fail;
568 }
569
570 fmsb = (struct ubi_fm_sb *)(fm_raw);
571 ai->max_sqnum = fmsb->sqnum;
572 fm_pos += sizeof(struct ubi_fm_sb);
573 if (fm_pos >= fm_size)
574 goto fail_bad;
575
576 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
577 fm_pos += sizeof(*fmhdr);
578 if (fm_pos >= fm_size)
579 goto fail_bad;
580
581 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
582 ubi_err("bad fastmap header magic: 0x%x, expected: 0x%x",
583 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
584 goto fail_bad;
585 }
586
587 fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
588 fm_pos += sizeof(*fmpl1);
589 if (fm_pos >= fm_size)
590 goto fail_bad;
591 if (be32_to_cpu(fmpl1->magic) != UBI_FM_POOL_MAGIC) {
592 ubi_err("bad fastmap pool magic: 0x%x, expected: 0x%x",
593 be32_to_cpu(fmpl1->magic), UBI_FM_POOL_MAGIC);
594 goto fail_bad;
595 }
596
597 fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
598 fm_pos += sizeof(*fmpl2);
599 if (fm_pos >= fm_size)
600 goto fail_bad;
601 if (be32_to_cpu(fmpl2->magic) != UBI_FM_POOL_MAGIC) {
602 ubi_err("bad fastmap pool magic: 0x%x, expected: 0x%x",
603 be32_to_cpu(fmpl2->magic), UBI_FM_POOL_MAGIC);
604 goto fail_bad;
605 }
606
607 pool_size = be16_to_cpu(fmpl1->size);
608 wl_pool_size = be16_to_cpu(fmpl2->size);
609 fm->max_pool_size = be16_to_cpu(fmpl1->max_size);
610 fm->max_wl_pool_size = be16_to_cpu(fmpl2->max_size);
611
612 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
613 ubi_err("bad pool size: %i", pool_size);
614 goto fail_bad;
615 }
616
617 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
618 ubi_err("bad WL pool size: %i", wl_pool_size);
619 goto fail_bad;
620 }
621
622
623 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
624 fm->max_pool_size < 0) {
625 ubi_err("bad maximal pool size: %i", fm->max_pool_size);
626 goto fail_bad;
627 }
628
629 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
630 fm->max_wl_pool_size < 0) {
631 ubi_err("bad maximal WL pool size: %i", fm->max_wl_pool_size);
632 goto fail_bad;
633 }
634
635 /* read EC values from free list */
636 for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) {
637 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
638 fm_pos += sizeof(*fmec);
639 if (fm_pos >= fm_size)
640 goto fail_bad;
641
642 add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum),
643 be32_to_cpu(fmec->ec), 0);
644 }
645
646 /* read EC values from used list */
647 for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) {
648 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
649 fm_pos += sizeof(*fmec);
650 if (fm_pos >= fm_size)
651 goto fail_bad;
652
653 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
654 be32_to_cpu(fmec->ec), 0);
655 }
656
657 /* read EC values from scrub list */
658 for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) {
659 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
660 fm_pos += sizeof(*fmec);
661 if (fm_pos >= fm_size)
662 goto fail_bad;
663
664 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
665 be32_to_cpu(fmec->ec), 1);
666 }
667
668 /* read EC values from erase list */
669 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
670 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
671 fm_pos += sizeof(*fmec);
672 if (fm_pos >= fm_size)
673 goto fail_bad;
674
675 add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
676 be32_to_cpu(fmec->ec), 1);
677 }
678
679 ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
680 ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
681
682 /* Iterate over all volumes and read their EBA table */
683 for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
684 fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
685 fm_pos += sizeof(*fmvhdr);
686 if (fm_pos >= fm_size)
687 goto fail_bad;
688
689 if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
690 ubi_err("bad fastmap vol header magic: 0x%x, " \
691 "expected: 0x%x",
692 be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
693 goto fail_bad;
694 }
695
696 av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
697 be32_to_cpu(fmvhdr->used_ebs),
698 be32_to_cpu(fmvhdr->data_pad),
699 fmvhdr->vol_type,
700 be32_to_cpu(fmvhdr->last_eb_bytes));
701
702 if (!av)
703 goto fail_bad;
704
705 ai->vols_found++;
706 if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
707 ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);
708
709 fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
710 fm_pos += sizeof(*fm_eba);
711 fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
712 if (fm_pos >= fm_size)
713 goto fail_bad;
714
715 if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
716 ubi_err("bad fastmap EBA header magic: 0x%x, " \
717 "expected: 0x%x",
718 be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
719 goto fail_bad;
720 }
721
722 for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
723 int pnum = be32_to_cpu(fm_eba->pnum[j]);
724
725 if ((int)be32_to_cpu(fm_eba->pnum[j]) < 0)
726 continue;
727
728 aeb = NULL;
729 list_for_each_entry(tmp_aeb, &used, u.list) {
730 if (tmp_aeb->pnum == pnum)
731 aeb = tmp_aeb;
732 }
733
734 /* This can happen if a PEB is already in an EBA known
735 * by this fastmap but the PEB itself is not in the used
736 * list.
737 * In this case the PEB can be within the fastmap pool
738 * or while writing the fastmap it was in the protection
739 * queue.
740 */
741 if (!aeb) {
742 aeb = kmem_cache_alloc(ai->aeb_slab_cache,
743 GFP_KERNEL);
744 if (!aeb) {
745 ret = -ENOMEM;
746
747 goto fail;
748 }
749
750 aeb->lnum = j;
751 aeb->pnum = be32_to_cpu(fm_eba->pnum[j]);
752 aeb->ec = -1;
753 aeb->scrub = aeb->copy_flag = aeb->sqnum = 0;
754 list_add_tail(&aeb->u.list, &eba_orphans);
755 continue;
756 }
757
758 aeb->lnum = j;
759
760 if (av->highest_lnum <= aeb->lnum)
761 av->highest_lnum = aeb->lnum;
762
763 assign_aeb_to_av(ai, aeb, av);
764
765 dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
766 aeb->pnum, aeb->lnum, av->vol_id);
767 }
768
769 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
770 if (!ech) {
771 ret = -ENOMEM;
772 goto fail;
773 }
774
775 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &eba_orphans,
776 u.list) {
777 int err;
778
779 if (ubi_io_is_bad(ubi, tmp_aeb->pnum)) {
780 ubi_err("bad PEB in fastmap EBA orphan list");
781 ret = UBI_BAD_FASTMAP;
782 kfree(ech);
783 goto fail;
784 }
785
786 err = ubi_io_read_ec_hdr(ubi, tmp_aeb->pnum, ech, 0);
787 if (err && err != UBI_IO_BITFLIPS) {
788 ubi_err("unable to read EC header! PEB:%i " \
789 "err:%i", tmp_aeb->pnum, err);
790 ret = err > 0 ? UBI_BAD_FASTMAP : err;
791 kfree(ech);
792
793 goto fail;
794 } else if (err == UBI_IO_BITFLIPS)
795 tmp_aeb->scrub = 1;
796
797 tmp_aeb->ec = be64_to_cpu(ech->ec);
798 assign_aeb_to_av(ai, tmp_aeb, av);
799 }
800
801 kfree(ech);
802 }
803
804 ret = scan_pool(ubi, ai, fmpl1->pebs, pool_size, &max_sqnum,
805 &eba_orphans, &free);
806 if (ret)
807 goto fail;
808
809 ret = scan_pool(ubi, ai, fmpl2->pebs, wl_pool_size, &max_sqnum,
810 &eba_orphans, &free);
811 if (ret)
812 goto fail;
813
814 if (max_sqnum > ai->max_sqnum)
815 ai->max_sqnum = max_sqnum;
816
817 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
818 list_del(&tmp_aeb->u.list);
819 list_add_tail(&tmp_aeb->u.list, &ai->free);
820 }
821
822 /*
823 * If fastmap is leaking PEBs (must not happen), raise a
824 * fat warning and fall back to scanning mode.
825 * We do this here because in ubi_wl_init() it's too late
826 * and we cannot fall back to scanning.
827 */
828 if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
829 ai->bad_peb_count - fm->used_blocks))
830 goto fail_bad;
831
832 return 0;
833
834fail_bad:
835 ret = UBI_BAD_FASTMAP;
836fail:
837 return ret;
838}
839
840/**
841 * ubi_scan_fastmap - scan the fastmap.
842 * @ubi: UBI device object
843 * @ai: UBI attach info to be filled
844 * @fm_anchor: The fastmap starts at this PEB
845 *
846 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found,
847 * UBI_BAD_FASTMAP if one was found but is not usable.
848 * < 0 indicates an internal error.
849 */
850int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
851 int fm_anchor)
852{
853 struct ubi_fm_sb *fmsb, *fmsb2;
854 struct ubi_vid_hdr *vh;
855 struct ubi_ec_hdr *ech;
856 struct ubi_fastmap_layout *fm;
857 int i, used_blocks, pnum, ret = 0;
858 size_t fm_size;
859 __be32 crc, tmp_crc;
860 unsigned long long sqnum = 0;
861
862 mutex_lock(&ubi->fm_mutex);
863 memset(ubi->fm_buf, 0, ubi->fm_size);
864
865 fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL);
866 if (!fmsb) {
867 ret = -ENOMEM;
868 goto out;
869 }
870
871 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
872 if (!fm) {
873 ret = -ENOMEM;
874 kfree(fmsb);
875 goto out;
876 }
877
878 ret = ubi_io_read(ubi, fmsb, fm_anchor, ubi->leb_start, sizeof(*fmsb));
879 if (ret && ret != UBI_IO_BITFLIPS)
880 goto free_fm_sb;
881 else if (ret == UBI_IO_BITFLIPS)
882 fm->to_be_tortured[0] = 1;
883
884 if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
885 ubi_err("bad super block magic: 0x%x, expected: 0x%x",
886 be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
887 ret = UBI_BAD_FASTMAP;
888 goto free_fm_sb;
889 }
890
891 if (fmsb->version != UBI_FM_FMT_VERSION) {
892 ubi_err("bad fastmap version: %i, expected: %i",
893 fmsb->version, UBI_FM_FMT_VERSION);
894 ret = UBI_BAD_FASTMAP;
895 goto free_fm_sb;
896 }
897
898 used_blocks = be32_to_cpu(fmsb->used_blocks);
899 if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
900 ubi_err("number of fastmap blocks is invalid: %i", used_blocks);
901 ret = UBI_BAD_FASTMAP;
902 goto free_fm_sb;
903 }
904
905 fm_size = ubi->leb_size * used_blocks;
906 if (fm_size != ubi->fm_size) {
907 ubi_err("bad fastmap size: %zi, expected: %zi", fm_size,
908 ubi->fm_size);
909 ret = UBI_BAD_FASTMAP;
910 goto free_fm_sb;
911 }
912
913 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
914 if (!ech) {
915 ret = -ENOMEM;
916 goto free_fm_sb;
917 }
918
919 vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
920 if (!vh) {
921 ret = -ENOMEM;
922 goto free_hdr;
923 }
924
925 for (i = 0; i < used_blocks; i++) {
926 pnum = be32_to_cpu(fmsb->block_loc[i]);
927
928 if (ubi_io_is_bad(ubi, pnum)) {
929 ret = UBI_BAD_FASTMAP;
930 goto free_hdr;
931 }
932
933 ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
934 if (ret && ret != UBI_IO_BITFLIPS) {
935 ubi_err("unable to read fastmap block# %i EC (PEB: %i)",
936 i, pnum);
937 if (ret > 0)
938 ret = UBI_BAD_FASTMAP;
939 goto free_hdr;
940 } else if (ret == UBI_IO_BITFLIPS)
941 fm->to_be_tortured[i] = 1;
942
943 if (!ubi->image_seq)
944 ubi->image_seq = be32_to_cpu(ech->image_seq);
945
946 if (be32_to_cpu(ech->image_seq) != ubi->image_seq) {
947 ret = UBI_BAD_FASTMAP;
948 goto free_hdr;
949 }
950
951 ret = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
952 if (ret && ret != UBI_IO_BITFLIPS) {
953 ubi_err("unable to read fastmap block# %i (PEB: %i)",
954 i, pnum);
955 goto free_hdr;
956 }
957
958 if (i == 0) {
959 if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
960 ubi_err("bad fastmap anchor vol_id: 0x%x," \
961 " expected: 0x%x",
962 be32_to_cpu(vh->vol_id),
963 UBI_FM_SB_VOLUME_ID);
964 ret = UBI_BAD_FASTMAP;
965 goto free_hdr;
966 }
967 } else {
968 if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
969 ubi_err("bad fastmap data vol_id: 0x%x," \
970 " expected: 0x%x",
971 be32_to_cpu(vh->vol_id),
972 UBI_FM_DATA_VOLUME_ID);
973 ret = UBI_BAD_FASTMAP;
974 goto free_hdr;
975 }
976 }
977
978 if (sqnum < be64_to_cpu(vh->sqnum))
979 sqnum = be64_to_cpu(vh->sqnum);
980
981 ret = ubi_io_read(ubi, ubi->fm_buf + (ubi->leb_size * i), pnum,
982 ubi->leb_start, ubi->leb_size);
983 if (ret && ret != UBI_IO_BITFLIPS) {
984 ubi_err("unable to read fastmap block# %i (PEB: %i, " \
985 "err: %i)", i, pnum, ret);
986 goto free_hdr;
987 }
988 }
989
990 kfree(fmsb);
991 fmsb = NULL;
992
993 fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
994 tmp_crc = be32_to_cpu(fmsb2->data_crc);
995 fmsb2->data_crc = 0;
996 crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
997 if (crc != tmp_crc) {
998 ubi_err("fastmap data CRC is invalid");
999 ubi_err("CRC should be: 0x%x, calc: 0x%x", tmp_crc, crc);
1000 ret = UBI_BAD_FASTMAP;
1001 goto free_hdr;
1002 }
1003
1004 fmsb2->sqnum = sqnum;
1005
1006 fm->used_blocks = used_blocks;
1007
1008 ret = ubi_attach_fastmap(ubi, ai, fm);
1009 if (ret) {
1010 if (ret > 0)
1011 ret = UBI_BAD_FASTMAP;
1012 goto free_hdr;
1013 }
1014
1015 for (i = 0; i < used_blocks; i++) {
1016 struct ubi_wl_entry *e;
1017
1018 e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
1019 if (!e) {
1020 while (i--)
1021 kfree(fm->e[i]);
1022
1023 ret = -ENOMEM;
1024 goto free_hdr;
1025 }
1026
1027 e->pnum = be32_to_cpu(fmsb2->block_loc[i]);
1028 e->ec = be32_to_cpu(fmsb2->block_ec[i]);
1029 fm->e[i] = e;
1030 }
1031
1032 ubi->fm = fm;
1033 ubi->fm_pool.max_size = ubi->fm->max_pool_size;
1034 ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
1035 ubi_msg("attached by fastmap");
1036 ubi_msg("fastmap pool size: %d", ubi->fm_pool.max_size);
1037 ubi_msg("fastmap WL pool size: %d", ubi->fm_wl_pool.max_size);
1038 ubi->fm_disabled = 0;
1039
1040 ubi_free_vid_hdr(ubi, vh);
1041 kfree(ech);
1042out:
1043 mutex_unlock(&ubi->fm_mutex);
1044 if (ret == UBI_BAD_FASTMAP)
1045 ubi_err("Attach by fastmap failed, doing a full scan!");
1046 return ret;
1047
1048free_hdr:
1049 ubi_free_vid_hdr(ubi, vh);
1050 kfree(ech);
1051free_fm_sb:
1052 kfree(fmsb);
1053 kfree(fm);
1054 goto out;
1055}
1056
1057/**
1058 * ubi_write_fastmap - writes a fastmap.
1059 * @ubi: UBI device object
1060 * @new_fm: the to be written fastmap
1061 *
1062 * Returns 0 on success, < 0 indicates an internal error.
1063 */
1064static int ubi_write_fastmap(struct ubi_device *ubi,
1065 struct ubi_fastmap_layout *new_fm)
1066{
1067 size_t fm_pos = 0;
1068 void *fm_raw;
1069 struct ubi_fm_sb *fmsb;
1070 struct ubi_fm_hdr *fmh;
1071 struct ubi_fm_scan_pool *fmpl1, *fmpl2;
1072 struct ubi_fm_ec *fec;
1073 struct ubi_fm_volhdr *fvh;
1074 struct ubi_fm_eba *feba;
1075 struct rb_node *node;
1076 struct ubi_wl_entry *wl_e;
1077 struct ubi_volume *vol;
1078 struct ubi_vid_hdr *avhdr, *dvhdr;
1079 struct ubi_work *ubi_wrk;
1080 int ret, i, j, free_peb_count, used_peb_count, vol_count;
1081 int scrub_peb_count, erase_peb_count;
1082
1083 fm_raw = ubi->fm_buf;
1084 memset(ubi->fm_buf, 0, ubi->fm_size);
1085
1086 avhdr = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1087 if (!avhdr) {
1088 ret = -ENOMEM;
1089 goto out;
1090 }
1091
1092 dvhdr = new_fm_vhdr(ubi, UBI_FM_DATA_VOLUME_ID);
1093 if (!dvhdr) {
1094 ret = -ENOMEM;
1095 goto out_kfree;
1096 }
1097
1098 spin_lock(&ubi->volumes_lock);
1099 spin_lock(&ubi->wl_lock);
1100
1101 fmsb = (struct ubi_fm_sb *)fm_raw;
1102 fm_pos += sizeof(*fmsb);
1103 ubi_assert(fm_pos <= ubi->fm_size);
1104
1105 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
1106 fm_pos += sizeof(*fmh);
1107 ubi_assert(fm_pos <= ubi->fm_size);
1108
1109 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC);
1110 fmsb->version = UBI_FM_FMT_VERSION;
1111 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks);
1112 /* the max sqnum will be filled in while *reading* the fastmap */
1113 fmsb->sqnum = 0;
1114
1115 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC);
1116 free_peb_count = 0;
1117 used_peb_count = 0;
1118 scrub_peb_count = 0;
1119 erase_peb_count = 0;
1120 vol_count = 0;
1121
1122 fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1123 fm_pos += sizeof(*fmpl1);
1124 fmpl1->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1125 fmpl1->size = cpu_to_be16(ubi->fm_pool.size);
1126 fmpl1->max_size = cpu_to_be16(ubi->fm_pool.max_size);
1127
1128 for (i = 0; i < ubi->fm_pool.size; i++)
1129 fmpl1->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]);
1130
1131 fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1132 fm_pos += sizeof(*fmpl2);
1133 fmpl2->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1134 fmpl2->size = cpu_to_be16(ubi->fm_wl_pool.size);
1135 fmpl2->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size);
1136
1137 for (i = 0; i < ubi->fm_wl_pool.size; i++)
1138 fmpl2->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]);
1139
1140 for (node = rb_first(&ubi->free); node; node = rb_next(node)) {
1141 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1142 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1143
1144 fec->pnum = cpu_to_be32(wl_e->pnum);
1145 fec->ec = cpu_to_be32(wl_e->ec);
1146
1147 free_peb_count++;
1148 fm_pos += sizeof(*fec);
1149 ubi_assert(fm_pos <= ubi->fm_size);
1150 }
1151 fmh->free_peb_count = cpu_to_be32(free_peb_count);
1152
1153 for (node = rb_first(&ubi->used); node; node = rb_next(node)) {
1154 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1155 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1156
1157 fec->pnum = cpu_to_be32(wl_e->pnum);
1158 fec->ec = cpu_to_be32(wl_e->ec);
1159
1160 used_peb_count++;
1161 fm_pos += sizeof(*fec);
1162 ubi_assert(fm_pos <= ubi->fm_size);
1163 }
1164 fmh->used_peb_count = cpu_to_be32(used_peb_count);
1165
1166 for (node = rb_first(&ubi->scrub); node; node = rb_next(node)) {
1167 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1168 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1169
1170 fec->pnum = cpu_to_be32(wl_e->pnum);
1171 fec->ec = cpu_to_be32(wl_e->ec);
1172
1173 scrub_peb_count++;
1174 fm_pos += sizeof(*fec);
1175 ubi_assert(fm_pos <= ubi->fm_size);
1176 }
1177 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count);
1178
1179
1180 list_for_each_entry(ubi_wrk, &ubi->works, list) {
1181 if (ubi_is_erase_work(ubi_wrk)) {
1182 wl_e = ubi_wrk->e;
1183 ubi_assert(wl_e);
1184
1185 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1186
1187 fec->pnum = cpu_to_be32(wl_e->pnum);
1188 fec->ec = cpu_to_be32(wl_e->ec);
1189
1190 erase_peb_count++;
1191 fm_pos += sizeof(*fec);
1192 ubi_assert(fm_pos <= ubi->fm_size);
1193 }
1194 }
1195 fmh->erase_peb_count = cpu_to_be32(erase_peb_count);
1196
1197 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) {
1198 vol = ubi->volumes[i];
1199
1200 if (!vol)
1201 continue;
1202
1203 vol_count++;
1204
1205 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
1206 fm_pos += sizeof(*fvh);
1207 ubi_assert(fm_pos <= ubi->fm_size);
1208
1209 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC);
1210 fvh->vol_id = cpu_to_be32(vol->vol_id);
1211 fvh->vol_type = vol->vol_type;
1212 fvh->used_ebs = cpu_to_be32(vol->used_ebs);
1213 fvh->data_pad = cpu_to_be32(vol->data_pad);
1214 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes);
1215
1216 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME ||
1217 vol->vol_type == UBI_STATIC_VOLUME);
1218
1219 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
1220 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);
1221 ubi_assert(fm_pos <= ubi->fm_size);
1222
1223 for (j = 0; j < vol->reserved_pebs; j++)
1224 feba->pnum[j] = cpu_to_be32(vol->eba_tbl[j]);
1225
1226 feba->reserved_pebs = cpu_to_be32(j);
1227 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);
1228 }
1229 fmh->vol_count = cpu_to_be32(vol_count);
1230 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count);
1231
1232 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1233 avhdr->lnum = 0;
1234
1235 spin_unlock(&ubi->wl_lock);
1236 spin_unlock(&ubi->volumes_lock);
1237
1238 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum);
1239 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avhdr);
1240 if (ret) {
1241 ubi_err("unable to write vid_hdr to fastmap SB!");
1242 goto out_kfree;
1243 }
1244
1245 for (i = 0; i < new_fm->used_blocks; i++) {
1246 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum);
1247 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec);
1248 }
1249
1250 fmsb->data_crc = 0;
1251 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw,
1252 ubi->fm_size));
1253
1254 for (i = 1; i < new_fm->used_blocks; i++) {
1255 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1256 dvhdr->lnum = cpu_to_be32(i);
1257 dbg_bld("writing fastmap data to PEB %i sqnum %llu",
1258 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum));
1259 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvhdr);
1260 if (ret) {
1261 ubi_err("unable to write vid_hdr to PEB %i!",
1262 new_fm->e[i]->pnum);
1263 goto out_kfree;
1264 }
1265 }
1266
1267 for (i = 0; i < new_fm->used_blocks; i++) {
1268 ret = ubi_io_write(ubi, fm_raw + (i * ubi->leb_size),
1269 new_fm->e[i]->pnum, ubi->leb_start, ubi->leb_size);
1270 if (ret) {
1271 ubi_err("unable to write fastmap to PEB %i!",
1272 new_fm->e[i]->pnum);
1273 goto out_kfree;
1274 }
1275 }
1276
1277 ubi_assert(new_fm);
1278 ubi->fm = new_fm;
1279
1280 dbg_bld("fastmap written!");
1281
1282out_kfree:
1283 ubi_free_vid_hdr(ubi, avhdr);
1284 ubi_free_vid_hdr(ubi, dvhdr);
1285out:
1286 return ret;
1287}
1288
1289/**
1290 * erase_block - Manually erase a PEB.
1291 * @ubi: UBI device object
1292 * @pnum: PEB to be erased
1293 *
1294 * Returns the new EC value on success, < 0 indicates an internal error.
1295 */
1296static int erase_block(struct ubi_device *ubi, int pnum)
1297{
1298 int ret;
1299 struct ubi_ec_hdr *ec_hdr;
1300 long long ec;
1301
1302 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
1303 if (!ec_hdr)
1304 return -ENOMEM;
1305
1306 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0);
1307 if (ret < 0)
1308 goto out;
1309 else if (ret && ret != UBI_IO_BITFLIPS) {
1310 ret = -EINVAL;
1311 goto out;
1312 }
1313
1314 ret = ubi_io_sync_erase(ubi, pnum, 0);
1315 if (ret < 0)
1316 goto out;
1317
1318 ec = be64_to_cpu(ec_hdr->ec);
1319 ec += ret;
1320 if (ec > UBI_MAX_ERASECOUNTER) {
1321 ret = -EINVAL;
1322 goto out;
1323 }
1324
1325 ec_hdr->ec = cpu_to_be64(ec);
1326 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
1327 if (ret < 0)
1328 goto out;
1329
1330 ret = ec;
1331out:
1332 kfree(ec_hdr);
1333 return ret;
1334}
1335
1336/**
1337 * invalidate_fastmap - destroys a fastmap.
1338 * @ubi: UBI device object
1339 * @fm: the fastmap to be destroyed
1340 *
1341 * Returns 0 on success, < 0 indicates an internal error.
1342 */
1343static int invalidate_fastmap(struct ubi_device *ubi,
1344 struct ubi_fastmap_layout *fm)
1345{
1346 int ret, i;
1347 struct ubi_vid_hdr *vh;
1348
1349 ret = erase_block(ubi, fm->e[0]->pnum);
1350 if (ret < 0)
1351 return ret;
1352
1353 vh = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1354 if (!vh)
1355 return -ENOMEM;
1356
1357 /* deleting the current fastmap SB is not enough, an old SB may exist,
1358 * so create a (corrupted) SB such that fastmap will find it and fall
1359 * back to scanning mode in any case */
1360 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1361 ret = ubi_io_write_vid_hdr(ubi, fm->e[0]->pnum, vh);
1362
1363 for (i = 0; i < fm->used_blocks; i++)
1364 ubi_wl_put_fm_peb(ubi, fm->e[i], i, fm->to_be_tortured[i]);
1365
1366 return ret;
1367}
1368
1369/**
1370 * ubi_update_fastmap - will be called by UBI if a volume changes or
1371 * a fastmap pool becomes full.
1372 * @ubi: UBI device object
1373 *
1374 * Returns 0 on success, < 0 indicates an internal error.
1375 */
1376int ubi_update_fastmap(struct ubi_device *ubi)
1377{
1378 int ret, i;
1379 struct ubi_fastmap_layout *new_fm, *old_fm;
1380 struct ubi_wl_entry *tmp_e;
1381
1382 mutex_lock(&ubi->fm_mutex);
1383
1384 ubi_refill_pools(ubi);
1385
1386 if (ubi->ro_mode || ubi->fm_disabled) {
1387 mutex_unlock(&ubi->fm_mutex);
1388 return 0;
1389 }
1390
1391 ret = ubi_ensure_anchor_pebs(ubi);
1392 if (ret) {
1393 mutex_unlock(&ubi->fm_mutex);
1394 return ret;
1395 }
1396
1397 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
1398 if (!new_fm) {
1399 mutex_unlock(&ubi->fm_mutex);
1400 return -ENOMEM;
1401 }
1402
1403 new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
1404
1405 for (i = 0; i < new_fm->used_blocks; i++) {
1406 new_fm->e[i] = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
1407 if (!new_fm->e[i]) {
1408 while (i--)
1409 kfree(new_fm->e[i]);
1410
1411 kfree(new_fm);
1412 mutex_unlock(&ubi->fm_mutex);
1413 return -ENOMEM;
1414 }
1415 }
1416
1417 old_fm = ubi->fm;
1418 ubi->fm = NULL;
1419
1420 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) {
1421 ubi_err("fastmap too large");
1422 ret = -ENOSPC;
1423 goto err;
1424 }
1425
1426 for (i = 1; i < new_fm->used_blocks; i++) {
1427 spin_lock(&ubi->wl_lock);
1428 tmp_e = ubi_wl_get_fm_peb(ubi, 0);
1429 spin_unlock(&ubi->wl_lock);
1430
1431 if (!tmp_e && !old_fm) {
1432 int j;
1433 ubi_err("could not get any free erase block");
1434
1435 for (j = 1; j < i; j++)
1436 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0);
1437
1438 ret = -ENOSPC;
1439 goto err;
1440 } else if (!tmp_e && old_fm) {
1441 ret = erase_block(ubi, old_fm->e[i]->pnum);
1442 if (ret < 0) {
1443 int j;
1444
1445 for (j = 1; j < i; j++)
1446 ubi_wl_put_fm_peb(ubi, new_fm->e[j],
1447 j, 0);
1448
1449 ubi_err("could not erase old fastmap PEB");
1450 goto err;
1451 }
1452
1453 new_fm->e[i]->pnum = old_fm->e[i]->pnum;
1454 new_fm->e[i]->ec = old_fm->e[i]->ec;
1455 } else {
1456 new_fm->e[i]->pnum = tmp_e->pnum;
1457 new_fm->e[i]->ec = tmp_e->ec;
1458
1459 if (old_fm)
1460 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1461 old_fm->to_be_tortured[i]);
1462 }
1463 }
1464
1465 spin_lock(&ubi->wl_lock);
1466 tmp_e = ubi_wl_get_fm_peb(ubi, 1);
1467 spin_unlock(&ubi->wl_lock);
1468
1469 if (old_fm) {
1470 /* no fresh anchor PEB was found, reuse the old one */
1471 if (!tmp_e) {
1472 ret = erase_block(ubi, old_fm->e[0]->pnum);
1473 if (ret < 0) {
1474 int i;
1475 ubi_err("could not erase old anchor PEB");
1476
1477 for (i = 1; i < new_fm->used_blocks; i++)
1478 ubi_wl_put_fm_peb(ubi, new_fm->e[i],
1479 i, 0);
1480 goto err;
1481 }
1482
1483 new_fm->e[0]->pnum = old_fm->e[0]->pnum;
1484 new_fm->e[0]->ec = ret;
1485 } else {
1486 /* we've got a new anchor PEB, return the old one */
1487 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
1488 old_fm->to_be_tortured[0]);
1489
1490 new_fm->e[0]->pnum = tmp_e->pnum;
1491 new_fm->e[0]->ec = tmp_e->ec;
1492 }
1493 } else {
1494 if (!tmp_e) {
1495 int i;
1496 ubi_err("could not find any anchor PEB");
1497
1498 for (i = 1; i < new_fm->used_blocks; i++)
1499 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0);
1500
1501 ret = -ENOSPC;
1502 goto err;
1503 }
1504
1505 new_fm->e[0]->pnum = tmp_e->pnum;
1506 new_fm->e[0]->ec = tmp_e->ec;
1507 }
1508
1509 down_write(&ubi->work_sem);
1510 down_write(&ubi->fm_sem);
1511 ret = ubi_write_fastmap(ubi, new_fm);
1512 up_write(&ubi->fm_sem);
1513 up_write(&ubi->work_sem);
1514
1515 if (ret)
1516 goto err;
1517
1518out_unlock:
1519 mutex_unlock(&ubi->fm_mutex);
1520 kfree(old_fm);
1521 return ret;
1522
1523err:
1524 kfree(new_fm);
1525
1526 ubi_warn("Unable to write new fastmap, err=%i", ret);
1527
1528 ret = 0;
1529 if (old_fm) {
1530 ret = invalidate_fastmap(ubi, old_fm);
1531 if (ret < 0)
1532 ubi_err("Unable to invalidiate current fastmap!");
1533 else if (ret)
1534 ret = 0;
1535 }
1536 goto out_unlock;
1537}
diff --git a/drivers/mtd/ubi/ubi-media.h b/drivers/mtd/ubi/ubi-media.h
index 468ffbc0eabd..ac2b24d1783d 100644
--- a/drivers/mtd/ubi/ubi-media.h
+++ b/drivers/mtd/ubi/ubi-media.h
@@ -375,4 +375,141 @@ struct ubi_vtbl_record {
375 __be32 crc; 375 __be32 crc;
376} __packed; 376} __packed;
377 377
378/* UBI fastmap on-flash data structures */
379
380#define UBI_FM_SB_VOLUME_ID (UBI_LAYOUT_VOLUME_ID + 1)
381#define UBI_FM_DATA_VOLUME_ID (UBI_LAYOUT_VOLUME_ID + 2)
382
383/* fastmap on-flash data structure format version */
384#define UBI_FM_FMT_VERSION 1
385
386#define UBI_FM_SB_MAGIC 0x7B11D69F
387#define UBI_FM_HDR_MAGIC 0xD4B82EF7
388#define UBI_FM_VHDR_MAGIC 0xFA370ED1
389#define UBI_FM_POOL_MAGIC 0x67AF4D08
390#define UBI_FM_EBA_MAGIC 0xf0c040a8
391
392/* A fastmap supber block can be located between PEB 0 and
393 * UBI_FM_MAX_START */
394#define UBI_FM_MAX_START 64
395
396/* A fastmap can use up to UBI_FM_MAX_BLOCKS PEBs */
397#define UBI_FM_MAX_BLOCKS 32
398
399/* 5% of the total number of PEBs have to be scanned while attaching
400 * from a fastmap.
401 * But the size of this pool is limited to be between UBI_FM_MIN_POOL_SIZE and
402 * UBI_FM_MAX_POOL_SIZE */
403#define UBI_FM_MIN_POOL_SIZE 8
404#define UBI_FM_MAX_POOL_SIZE 256
405
406#define UBI_FM_WL_POOL_SIZE 25
407
408/**
409 * struct ubi_fm_sb - UBI fastmap super block
410 * @magic: fastmap super block magic number (%UBI_FM_SB_MAGIC)
411 * @version: format version of this fastmap
412 * @data_crc: CRC over the fastmap data
413 * @used_blocks: number of PEBs used by this fastmap
414 * @block_loc: an array containing the location of all PEBs of the fastmap
415 * @block_ec: the erase counter of each used PEB
416 * @sqnum: highest sequence number value at the time while taking the fastmap
417 *
418 */
419struct ubi_fm_sb {
420 __be32 magic;
421 __u8 version;
422 __u8 padding1[3];
423 __be32 data_crc;
424 __be32 used_blocks;
425 __be32 block_loc[UBI_FM_MAX_BLOCKS];
426 __be32 block_ec[UBI_FM_MAX_BLOCKS];
427 __be64 sqnum;
428 __u8 padding2[32];
429} __packed;
430
431/**
432 * struct ubi_fm_hdr - header of the fastmap data set
433 * @magic: fastmap header magic number (%UBI_FM_HDR_MAGIC)
434 * @free_peb_count: number of free PEBs known by this fastmap
435 * @used_peb_count: number of used PEBs known by this fastmap
436 * @scrub_peb_count: number of to be scrubbed PEBs known by this fastmap
437 * @bad_peb_count: number of bad PEBs known by this fastmap
438 * @erase_peb_count: number of bad PEBs which have to be erased
439 * @vol_count: number of UBI volumes known by this fastmap
440 */
441struct ubi_fm_hdr {
442 __be32 magic;
443 __be32 free_peb_count;
444 __be32 used_peb_count;
445 __be32 scrub_peb_count;
446 __be32 bad_peb_count;
447 __be32 erase_peb_count;
448 __be32 vol_count;
449 __u8 padding[4];
450} __packed;
451
452/* struct ubi_fm_hdr is followed by two struct ubi_fm_scan_pool */
453
454/**
455 * struct ubi_fm_scan_pool - Fastmap pool PEBs to be scanned while attaching
456 * @magic: pool magic numer (%UBI_FM_POOL_MAGIC)
457 * @size: current pool size
458 * @max_size: maximal pool size
459 * @pebs: an array containing the location of all PEBs in this pool
460 */
461struct ubi_fm_scan_pool {
462 __be32 magic;
463 __be16 size;
464 __be16 max_size;
465 __be32 pebs[UBI_FM_MAX_POOL_SIZE];
466 __be32 padding[4];
467} __packed;
468
469/* ubi_fm_scan_pool is followed by nfree+nused struct ubi_fm_ec records */
470
471/**
472 * struct ubi_fm_ec - stores the erase counter of a PEB
473 * @pnum: PEB number
474 * @ec: ec of this PEB
475 */
476struct ubi_fm_ec {
477 __be32 pnum;
478 __be32 ec;
479} __packed;
480
481/**
482 * struct ubi_fm_volhdr - Fastmap volume header
483 * it identifies the start of an eba table
484 * @magic: Fastmap volume header magic number (%UBI_FM_VHDR_MAGIC)
485 * @vol_id: volume id of the fastmapped volume
486 * @vol_type: type of the fastmapped volume
487 * @data_pad: data_pad value of the fastmapped volume
488 * @used_ebs: number of used LEBs within this volume
489 * @last_eb_bytes: number of bytes used in the last LEB
490 */
491struct ubi_fm_volhdr {
492 __be32 magic;
493 __be32 vol_id;
494 __u8 vol_type;
495 __u8 padding1[3];
496 __be32 data_pad;
497 __be32 used_ebs;
498 __be32 last_eb_bytes;
499 __u8 padding2[8];
500} __packed;
501
502/* struct ubi_fm_volhdr is followed by one struct ubi_fm_eba records */
503
504/**
505 * struct ubi_fm_eba - denotes an association beween a PEB and LEB
506 * @magic: EBA table magic number
507 * @reserved_pebs: number of table entries
508 * @pnum: PEB number of LEB (LEB is the index)
509 */
510struct ubi_fm_eba {
511 __be32 magic;
512 __be32 reserved_pebs;
513 __be32 pnum[0];
514} __packed;
378#endif /* !__UBI_MEDIA_H__ */ 515#endif /* !__UBI_MEDIA_H__ */
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 383ee43d2425..7d57469723cf 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -133,6 +133,17 @@ enum {
133 MOVE_RETRY, 133 MOVE_RETRY,
134}; 134};
135 135
136/*
137 * Return codes of the fastmap sub-system
138 *
139 * UBI_NO_FASTMAP: No fastmap super block was found
140 * UBI_BAD_FASTMAP: A fastmap was found but it's unusable
141 */
142enum {
143 UBI_NO_FASTMAP = 1,
144 UBI_BAD_FASTMAP,
145};
146
136/** 147/**
137 * struct ubi_wl_entry - wear-leveling entry. 148 * struct ubi_wl_entry - wear-leveling entry.
138 * @u.rb: link in the corresponding (free/used) RB-tree 149 * @u.rb: link in the corresponding (free/used) RB-tree
@@ -199,6 +210,41 @@ struct ubi_rename_entry {
199struct ubi_volume_desc; 210struct ubi_volume_desc;
200 211
201/** 212/**
213 * struct ubi_fastmap_layout - in-memory fastmap data structure.
214 * @e: PEBs used by the current fastmap
215 * @to_be_tortured: if non-zero tortured this PEB
216 * @used_blocks: number of used PEBs
217 * @max_pool_size: maximal size of the user pool
218 * @max_wl_pool_size: maximal size of the pool used by the WL sub-system
219 */
220struct ubi_fastmap_layout {
221 struct ubi_wl_entry *e[UBI_FM_MAX_BLOCKS];
222 int to_be_tortured[UBI_FM_MAX_BLOCKS];
223 int used_blocks;
224 int max_pool_size;
225 int max_wl_pool_size;
226};
227
228/**
229 * struct ubi_fm_pool - in-memory fastmap pool
230 * @pebs: PEBs in this pool
231 * @used: number of used PEBs
232 * @size: total number of PEBs in this pool
233 * @max_size: maximal size of the pool
234 *
235 * A pool gets filled with up to max_size.
236 * If all PEBs within the pool are used a new fastmap will be written
237 * to the flash and the pool gets refilled with empty PEBs.
238 *
239 */
240struct ubi_fm_pool {
241 int pebs[UBI_FM_MAX_POOL_SIZE];
242 int used;
243 int size;
244 int max_size;
245};
246
247/**
202 * struct ubi_volume - UBI volume description data structure. 248 * struct ubi_volume - UBI volume description data structure.
203 * @dev: device object to make use of the the Linux device model 249 * @dev: device object to make use of the the Linux device model
204 * @cdev: character device object to create character device 250 * @cdev: character device object to create character device
@@ -333,9 +379,21 @@ struct ubi_wl_entry;
333 * @ltree: the lock tree 379 * @ltree: the lock tree
334 * @alc_mutex: serializes "atomic LEB change" operations 380 * @alc_mutex: serializes "atomic LEB change" operations
335 * 381 *
382 * @fm_disabled: non-zero if fastmap is disabled (default)
383 * @fm: in-memory data structure of the currently used fastmap
384 * @fm_pool: in-memory data structure of the fastmap pool
385 * @fm_wl_pool: in-memory data structure of the fastmap pool used by the WL
386 * sub-system
387 * @fm_mutex: serializes ubi_update_fastmap() and protects @fm_buf
388 * @fm_buf: vmalloc()'d buffer which holds the raw fastmap
389 * @fm_size: fastmap size in bytes
390 * @fm_sem: allows ubi_update_fastmap() to block EBA table changes
391 * @fm_work: fastmap work queue
392 *
336 * @used: RB-tree of used physical eraseblocks 393 * @used: RB-tree of used physical eraseblocks
337 * @erroneous: RB-tree of erroneous used physical eraseblocks 394 * @erroneous: RB-tree of erroneous used physical eraseblocks
338 * @free: RB-tree of free physical eraseblocks 395 * @free: RB-tree of free physical eraseblocks
396 * @free_count: Contains the number of elements in @free
339 * @scrub: RB-tree of physical eraseblocks which need scrubbing 397 * @scrub: RB-tree of physical eraseblocks which need scrubbing
340 * @pq: protection queue (contain physical eraseblocks which are temporarily 398 * @pq: protection queue (contain physical eraseblocks which are temporarily
341 * protected from the wear-leveling worker) 399 * protected from the wear-leveling worker)
@@ -426,10 +484,22 @@ struct ubi_device {
426 struct rb_root ltree; 484 struct rb_root ltree;
427 struct mutex alc_mutex; 485 struct mutex alc_mutex;
428 486
487 /* Fastmap stuff */
488 int fm_disabled;
489 struct ubi_fastmap_layout *fm;
490 struct ubi_fm_pool fm_pool;
491 struct ubi_fm_pool fm_wl_pool;
492 struct rw_semaphore fm_sem;
493 struct mutex fm_mutex;
494 void *fm_buf;
495 size_t fm_size;
496 struct work_struct fm_work;
497
429 /* Wear-leveling sub-system's stuff */ 498 /* Wear-leveling sub-system's stuff */
430 struct rb_root used; 499 struct rb_root used;
431 struct rb_root erroneous; 500 struct rb_root erroneous;
432 struct rb_root free; 501 struct rb_root free;
502 int free_count;
433 struct rb_root scrub; 503 struct rb_root scrub;
434 struct list_head pq[UBI_PROT_QUEUE_LEN]; 504 struct list_head pq[UBI_PROT_QUEUE_LEN];
435 int pq_head; 505 int pq_head;
@@ -596,6 +666,32 @@ struct ubi_attach_info {
596 struct kmem_cache *aeb_slab_cache; 666 struct kmem_cache *aeb_slab_cache;
597}; 667};
598 668
669/**
670 * struct ubi_work - UBI work description data structure.
671 * @list: a link in the list of pending works
672 * @func: worker function
673 * @e: physical eraseblock to erase
674 * @vol_id: the volume ID on which this erasure is being performed
675 * @lnum: the logical eraseblock number
676 * @torture: if the physical eraseblock has to be tortured
677 * @anchor: produce a anchor PEB to by used by fastmap
678 *
679 * The @func pointer points to the worker function. If the @cancel argument is
680 * not zero, the worker has to free the resources and exit immediately. The
681 * worker has to return zero in case of success and a negative error code in
682 * case of failure.
683 */
684struct ubi_work {
685 struct list_head list;
686 int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int cancel);
687 /* The below fields are only relevant to erasure works */
688 struct ubi_wl_entry *e;
689 int vol_id;
690 int lnum;
691 int torture;
692 int anchor;
693};
694
599#include "debug.h" 695#include "debug.h"
600 696
601extern struct kmem_cache *ubi_wl_entry_slab; 697extern struct kmem_cache *ubi_wl_entry_slab;
@@ -606,7 +702,7 @@ extern struct class *ubi_class;
606extern struct mutex ubi_devices_mutex; 702extern struct mutex ubi_devices_mutex;
607extern struct blocking_notifier_head ubi_notifiers; 703extern struct blocking_notifier_head ubi_notifiers;
608 704
609/* scan.c */ 705/* attach.c */
610int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum, 706int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
611 int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips); 707 int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips);
612struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai, 708struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,
@@ -614,7 +710,7 @@ struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,
614void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av); 710void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av);
615struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi, 711struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi,
616 struct ubi_attach_info *ai); 712 struct ubi_attach_info *ai);
617int ubi_attach(struct ubi_device *ubi); 713int ubi_attach(struct ubi_device *ubi, int force_scan);
618void ubi_destroy_ai(struct ubi_attach_info *ai); 714void ubi_destroy_ai(struct ubi_attach_info *ai);
619 715
620/* vtbl.c */ 716/* vtbl.c */
@@ -664,6 +760,9 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
664int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, 760int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
665 struct ubi_vid_hdr *vid_hdr); 761 struct ubi_vid_hdr *vid_hdr);
666int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai); 762int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
763unsigned long long ubi_next_sqnum(struct ubi_device *ubi);
764int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
765 struct ubi_attach_info *ai_scan);
667 766
668/* wl.c */ 767/* wl.c */
669int ubi_wl_get_peb(struct ubi_device *ubi); 768int ubi_wl_get_peb(struct ubi_device *ubi);
@@ -674,6 +773,12 @@ int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum);
674int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai); 773int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
675void ubi_wl_close(struct ubi_device *ubi); 774void ubi_wl_close(struct ubi_device *ubi);
676int ubi_thread(void *u); 775int ubi_thread(void *u);
776struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor);
777int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *used_e,
778 int lnum, int torture);
779int ubi_is_erase_work(struct ubi_work *wrk);
780void ubi_refill_pools(struct ubi_device *ubi);
781int ubi_ensure_anchor_pebs(struct ubi_device *ubi);
677 782
678/* io.c */ 783/* io.c */
679int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset, 784int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
@@ -711,6 +816,15 @@ void ubi_free_internal_volumes(struct ubi_device *ubi);
711void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di); 816void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di);
712void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol, 817void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol,
713 struct ubi_volume_info *vi); 818 struct ubi_volume_info *vi);
819/* scan.c */
820int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
821 int pnum, const struct ubi_vid_hdr *vid_hdr);
822
823/* fastmap.c */
824size_t ubi_calc_fm_size(struct ubi_device *ubi);
825int ubi_update_fastmap(struct ubi_device *ubi);
826int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
827 int fm_anchor);
714 828
715/* 829/*
716 * ubi_rb_for_each_entry - walk an RB-tree. 830 * ubi_rb_for_each_entry - walk an RB-tree.
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 032fc57f1090..da7b44998b40 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -135,36 +135,48 @@
135 */ 135 */
136#define WL_MAX_FAILURES 32 136#define WL_MAX_FAILURES 32
137 137
138/**
139 * struct ubi_work - UBI work description data structure.
140 * @list: a link in the list of pending works
141 * @func: worker function
142 * @e: physical eraseblock to erase
143 * @vol_id: the volume ID on which this erasure is being performed
144 * @lnum: the logical eraseblock number
145 * @torture: if the physical eraseblock has to be tortured
146 *
147 * The @func pointer points to the worker function. If the @cancel argument is
148 * not zero, the worker has to free the resources and exit immediately. The
149 * worker has to return zero in case of success and a negative error code in
150 * case of failure.
151 */
152struct ubi_work {
153 struct list_head list;
154 int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int cancel);
155 /* The below fields are only relevant to erasure works */
156 struct ubi_wl_entry *e;
157 int vol_id;
158 int lnum;
159 int torture;
160};
161
162static int self_check_ec(struct ubi_device *ubi, int pnum, int ec); 138static int self_check_ec(struct ubi_device *ubi, int pnum, int ec);
163static int self_check_in_wl_tree(const struct ubi_device *ubi, 139static int self_check_in_wl_tree(const struct ubi_device *ubi,
164 struct ubi_wl_entry *e, struct rb_root *root); 140 struct ubi_wl_entry *e, struct rb_root *root);
165static int self_check_in_pq(const struct ubi_device *ubi, 141static int self_check_in_pq(const struct ubi_device *ubi,
166 struct ubi_wl_entry *e); 142 struct ubi_wl_entry *e);
167 143
144#ifdef CONFIG_MTD_UBI_FASTMAP
145/**
146 * update_fastmap_work_fn - calls ubi_update_fastmap from a work queue
147 * @wrk: the work description object
148 */
149static void update_fastmap_work_fn(struct work_struct *wrk)
150{
151 struct ubi_device *ubi = container_of(wrk, struct ubi_device, fm_work);
152 ubi_update_fastmap(ubi);
153}
154
155/**
156 * ubi_ubi_is_fm_block - returns 1 if a PEB is currently used in a fastmap.
157 * @ubi: UBI device description object
158 * @pnum: the to be checked PEB
159 */
160static int ubi_is_fm_block(struct ubi_device *ubi, int pnum)
161{
162 int i;
163
164 if (!ubi->fm)
165 return 0;
166
167 for (i = 0; i < ubi->fm->used_blocks; i++)
168 if (ubi->fm->e[i]->pnum == pnum)
169 return 1;
170
171 return 0;
172}
173#else
174static int ubi_is_fm_block(struct ubi_device *ubi, int pnum)
175{
176 return 0;
177}
178#endif
179
168/** 180/**
169 * wl_tree_add - add a wear-leveling entry to a WL RB-tree. 181 * wl_tree_add - add a wear-leveling entry to a WL RB-tree.
170 * @e: the wear-leveling entry to add 182 * @e: the wear-leveling entry to add
@@ -261,18 +273,16 @@ static int produce_free_peb(struct ubi_device *ubi)
261{ 273{
262 int err; 274 int err;
263 275
264 spin_lock(&ubi->wl_lock);
265 while (!ubi->free.rb_node) { 276 while (!ubi->free.rb_node) {
266 spin_unlock(&ubi->wl_lock); 277 spin_unlock(&ubi->wl_lock);
267 278
268 dbg_wl("do one work synchronously"); 279 dbg_wl("do one work synchronously");
269 err = do_work(ubi); 280 err = do_work(ubi);
270 if (err)
271 return err;
272 281
273 spin_lock(&ubi->wl_lock); 282 spin_lock(&ubi->wl_lock);
283 if (err)
284 return err;
274 } 285 }
275 spin_unlock(&ubi->wl_lock);
276 286
277 return 0; 287 return 0;
278} 288}
@@ -339,16 +349,18 @@ static void prot_queue_add(struct ubi_device *ubi, struct ubi_wl_entry *e)
339 349
340/** 350/**
341 * find_wl_entry - find wear-leveling entry closest to certain erase counter. 351 * find_wl_entry - find wear-leveling entry closest to certain erase counter.
352 * @ubi: UBI device description object
342 * @root: the RB-tree where to look for 353 * @root: the RB-tree where to look for
343 * @diff: maximum possible difference from the smallest erase counter 354 * @diff: maximum possible difference from the smallest erase counter
344 * 355 *
345 * This function looks for a wear leveling entry with erase counter closest to 356 * This function looks for a wear leveling entry with erase counter closest to
346 * min + @diff, where min is the smallest erase counter. 357 * min + @diff, where min is the smallest erase counter.
347 */ 358 */
348static struct ubi_wl_entry *find_wl_entry(struct rb_root *root, int diff) 359static struct ubi_wl_entry *find_wl_entry(struct ubi_device *ubi,
360 struct rb_root *root, int diff)
349{ 361{
350 struct rb_node *p; 362 struct rb_node *p;
351 struct ubi_wl_entry *e; 363 struct ubi_wl_entry *e, *prev_e = NULL;
352 int max; 364 int max;
353 365
354 e = rb_entry(rb_first(root), struct ubi_wl_entry, u.rb); 366 e = rb_entry(rb_first(root), struct ubi_wl_entry, u.rb);
@@ -363,35 +375,143 @@ static struct ubi_wl_entry *find_wl_entry(struct rb_root *root, int diff)
363 p = p->rb_left; 375 p = p->rb_left;
364 else { 376 else {
365 p = p->rb_right; 377 p = p->rb_right;
378 prev_e = e;
366 e = e1; 379 e = e1;
367 } 380 }
368 } 381 }
369 382
383 /* If no fastmap has been written and this WL entry can be used
384 * as anchor PEB, hold it back and return the second best WL entry
385 * such that fastmap can use the anchor PEB later. */
386 if (prev_e && !ubi->fm_disabled &&
387 !ubi->fm && e->pnum < UBI_FM_MAX_START)
388 return prev_e;
389
370 return e; 390 return e;
371} 391}
372 392
373/** 393/**
374 * ubi_wl_get_peb - get a physical eraseblock. 394 * find_mean_wl_entry - find wear-leveling entry with medium erase counter.
395 * @ubi: UBI device description object
396 * @root: the RB-tree where to look for
397 *
398 * This function looks for a wear leveling entry with medium erase counter,
399 * but not greater or equivalent than the lowest erase counter plus
400 * %WL_FREE_MAX_DIFF/2.
401 */
402static struct ubi_wl_entry *find_mean_wl_entry(struct ubi_device *ubi,
403 struct rb_root *root)
404{
405 struct ubi_wl_entry *e, *first, *last;
406
407 first = rb_entry(rb_first(root), struct ubi_wl_entry, u.rb);
408 last = rb_entry(rb_last(root), struct ubi_wl_entry, u.rb);
409
410 if (last->ec - first->ec < WL_FREE_MAX_DIFF) {
411 e = rb_entry(root->rb_node, struct ubi_wl_entry, u.rb);
412
413#ifdef CONFIG_MTD_UBI_FASTMAP
414 /* If no fastmap has been written and this WL entry can be used
415 * as anchor PEB, hold it back and return the second best
416 * WL entry such that fastmap can use the anchor PEB later. */
417 if (e && !ubi->fm_disabled && !ubi->fm &&
418 e->pnum < UBI_FM_MAX_START)
419 e = rb_entry(rb_next(root->rb_node),
420 struct ubi_wl_entry, u.rb);
421#endif
422 } else
423 e = find_wl_entry(ubi, root, WL_FREE_MAX_DIFF/2);
424
425 return e;
426}
427
428#ifdef CONFIG_MTD_UBI_FASTMAP
429/**
430 * find_anchor_wl_entry - find wear-leveling entry to used as anchor PEB.
431 * @root: the RB-tree where to look for
432 */
433static struct ubi_wl_entry *find_anchor_wl_entry(struct rb_root *root)
434{
435 struct rb_node *p;
436 struct ubi_wl_entry *e, *victim = NULL;
437 int max_ec = UBI_MAX_ERASECOUNTER;
438
439 ubi_rb_for_each_entry(p, e, root, u.rb) {
440 if (e->pnum < UBI_FM_MAX_START && e->ec < max_ec) {
441 victim = e;
442 max_ec = e->ec;
443 }
444 }
445
446 return victim;
447}
448
449static int anchor_pebs_avalible(struct rb_root *root)
450{
451 struct rb_node *p;
452 struct ubi_wl_entry *e;
453
454 ubi_rb_for_each_entry(p, e, root, u.rb)
455 if (e->pnum < UBI_FM_MAX_START)
456 return 1;
457
458 return 0;
459}
460
461/**
462 * ubi_wl_get_fm_peb - find a physical erase block with a given maximal number.
463 * @ubi: UBI device description object
464 * @anchor: This PEB will be used as anchor PEB by fastmap
465 *
466 * The function returns a physical erase block with a given maximal number
467 * and removes it from the wl subsystem.
468 * Must be called with wl_lock held!
469 */
470struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor)
471{
472 struct ubi_wl_entry *e = NULL;
473
474 if (!ubi->free.rb_node || (ubi->free_count - ubi->beb_rsvd_pebs < 1))
475 goto out;
476
477 if (anchor)
478 e = find_anchor_wl_entry(&ubi->free);
479 else
480 e = find_mean_wl_entry(ubi, &ubi->free);
481
482 if (!e)
483 goto out;
484
485 self_check_in_wl_tree(ubi, e, &ubi->free);
486
487 /* remove it from the free list,
488 * the wl subsystem does no longer know this erase block */
489 rb_erase(&e->u.rb, &ubi->free);
490 ubi->free_count--;
491out:
492 return e;
493}
494#endif
495
496/**
497 * __wl_get_peb - get a physical eraseblock.
375 * @ubi: UBI device description object 498 * @ubi: UBI device description object
376 * 499 *
377 * This function returns a physical eraseblock in case of success and a 500 * This function returns a physical eraseblock in case of success and a
378 * negative error code in case of failure. Might sleep. 501 * negative error code in case of failure. Might sleep.
379 */ 502 */
380int ubi_wl_get_peb(struct ubi_device *ubi) 503static int __wl_get_peb(struct ubi_device *ubi)
381{ 504{
382 int err; 505 int err;
383 struct ubi_wl_entry *e, *first, *last; 506 struct ubi_wl_entry *e;
384 507
385retry: 508retry:
386 spin_lock(&ubi->wl_lock);
387 if (!ubi->free.rb_node) { 509 if (!ubi->free.rb_node) {
388 if (ubi->works_count == 0) { 510 if (ubi->works_count == 0) {
389 ubi_assert(list_empty(&ubi->works));
390 ubi_err("no free eraseblocks"); 511 ubi_err("no free eraseblocks");
391 spin_unlock(&ubi->wl_lock); 512 ubi_assert(list_empty(&ubi->works));
392 return -ENOSPC; 513 return -ENOSPC;
393 } 514 }
394 spin_unlock(&ubi->wl_lock);
395 515
396 err = produce_free_peb(ubi); 516 err = produce_free_peb(ubi);
397 if (err < 0) 517 if (err < 0)
@@ -399,13 +519,11 @@ retry:
399 goto retry; 519 goto retry;
400 } 520 }
401 521
402 first = rb_entry(rb_first(&ubi->free), struct ubi_wl_entry, u.rb); 522 e = find_mean_wl_entry(ubi, &ubi->free);
403 last = rb_entry(rb_last(&ubi->free), struct ubi_wl_entry, u.rb); 523 if (!e) {
404 524 ubi_err("no free eraseblocks");
405 if (last->ec - first->ec < WL_FREE_MAX_DIFF) 525 return -ENOSPC;
406 e = rb_entry(ubi->free.rb_node, struct ubi_wl_entry, u.rb); 526 }
407 else
408 e = find_wl_entry(&ubi->free, WL_FREE_MAX_DIFF/2);
409 527
410 self_check_in_wl_tree(ubi, e, &ubi->free); 528 self_check_in_wl_tree(ubi, e, &ubi->free);
411 529
@@ -414,10 +532,14 @@ retry:
414 * be protected from being moved for some time. 532 * be protected from being moved for some time.
415 */ 533 */
416 rb_erase(&e->u.rb, &ubi->free); 534 rb_erase(&e->u.rb, &ubi->free);
535 ubi->free_count--;
417 dbg_wl("PEB %d EC %d", e->pnum, e->ec); 536 dbg_wl("PEB %d EC %d", e->pnum, e->ec);
537#ifndef CONFIG_MTD_UBI_FASTMAP
538 /* We have to enqueue e only if fastmap is disabled,
539 * is fastmap enabled prot_queue_add() will be called by
540 * ubi_wl_get_peb() after removing e from the pool. */
418 prot_queue_add(ubi, e); 541 prot_queue_add(ubi, e);
419 spin_unlock(&ubi->wl_lock); 542#endif
420
421 err = ubi_self_check_all_ff(ubi, e->pnum, ubi->vid_hdr_aloffset, 543 err = ubi_self_check_all_ff(ubi, e->pnum, ubi->vid_hdr_aloffset,
422 ubi->peb_size - ubi->vid_hdr_aloffset); 544 ubi->peb_size - ubi->vid_hdr_aloffset);
423 if (err) { 545 if (err) {
@@ -428,6 +550,150 @@ retry:
428 return e->pnum; 550 return e->pnum;
429} 551}
430 552
553#ifdef CONFIG_MTD_UBI_FASTMAP
554/**
555 * return_unused_pool_pebs - returns unused PEB to the free tree.
556 * @ubi: UBI device description object
557 * @pool: fastmap pool description object
558 */
559static void return_unused_pool_pebs(struct ubi_device *ubi,
560 struct ubi_fm_pool *pool)
561{
562 int i;
563 struct ubi_wl_entry *e;
564
565 for (i = pool->used; i < pool->size; i++) {
566 e = ubi->lookuptbl[pool->pebs[i]];
567 wl_tree_add(e, &ubi->free);
568 ubi->free_count++;
569 }
570}
571
572/**
573 * refill_wl_pool - refills all the fastmap pool used by the
574 * WL sub-system.
575 * @ubi: UBI device description object
576 */
577static void refill_wl_pool(struct ubi_device *ubi)
578{
579 struct ubi_wl_entry *e;
580 struct ubi_fm_pool *pool = &ubi->fm_wl_pool;
581
582 return_unused_pool_pebs(ubi, pool);
583
584 for (pool->size = 0; pool->size < pool->max_size; pool->size++) {
585 if (!ubi->free.rb_node ||
586 (ubi->free_count - ubi->beb_rsvd_pebs < 5))
587 break;
588
589 e = find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);
590 self_check_in_wl_tree(ubi, e, &ubi->free);
591 rb_erase(&e->u.rb, &ubi->free);
592 ubi->free_count--;
593
594 pool->pebs[pool->size] = e->pnum;
595 }
596 pool->used = 0;
597}
598
599/**
600 * refill_wl_user_pool - refills all the fastmap pool used by ubi_wl_get_peb.
601 * @ubi: UBI device description object
602 */
603static void refill_wl_user_pool(struct ubi_device *ubi)
604{
605 struct ubi_fm_pool *pool = &ubi->fm_pool;
606
607 return_unused_pool_pebs(ubi, pool);
608
609 for (pool->size = 0; pool->size < pool->max_size; pool->size++) {
610 if (!ubi->free.rb_node ||
611 (ubi->free_count - ubi->beb_rsvd_pebs < 1))
612 break;
613
614 pool->pebs[pool->size] = __wl_get_peb(ubi);
615 if (pool->pebs[pool->size] < 0)
616 break;
617 }
618 pool->used = 0;
619}
620
621/**
622 * ubi_refill_pools - refills all fastmap PEB pools.
623 * @ubi: UBI device description object
624 */
625void ubi_refill_pools(struct ubi_device *ubi)
626{
627 spin_lock(&ubi->wl_lock);
628 refill_wl_pool(ubi);
629 refill_wl_user_pool(ubi);
630 spin_unlock(&ubi->wl_lock);
631}
632
633/* ubi_wl_get_peb - works exaclty like __wl_get_peb but keeps track of
634 * the fastmap pool.
635 */
636int ubi_wl_get_peb(struct ubi_device *ubi)
637{
638 int ret;
639 struct ubi_fm_pool *pool = &ubi->fm_pool;
640 struct ubi_fm_pool *wl_pool = &ubi->fm_wl_pool;
641
642 if (!pool->size || !wl_pool->size || pool->used == pool->size ||
643 wl_pool->used == wl_pool->size)
644 ubi_update_fastmap(ubi);
645
646 /* we got not a single free PEB */
647 if (!pool->size)
648 ret = -ENOSPC;
649 else {
650 spin_lock(&ubi->wl_lock);
651 ret = pool->pebs[pool->used++];
652 prot_queue_add(ubi, ubi->lookuptbl[ret]);
653 spin_unlock(&ubi->wl_lock);
654 }
655
656 return ret;
657}
658
659/* get_peb_for_wl - returns a PEB to be used internally by the WL sub-system.
660 *
661 * @ubi: UBI device description object
662 */
663static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi)
664{
665 struct ubi_fm_pool *pool = &ubi->fm_wl_pool;
666 int pnum;
667
668 if (pool->used == pool->size || !pool->size) {
669 /* We cannot update the fastmap here because this
670 * function is called in atomic context.
671 * Let's fail here and refill/update it as soon as possible. */
672 schedule_work(&ubi->fm_work);
673 return NULL;
674 } else {
675 pnum = pool->pebs[pool->used++];
676 return ubi->lookuptbl[pnum];
677 }
678}
679#else
680static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi)
681{
682 return find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);
683}
684
685int ubi_wl_get_peb(struct ubi_device *ubi)
686{
687 int peb;
688
689 spin_lock(&ubi->wl_lock);
690 peb = __wl_get_peb(ubi);
691 spin_unlock(&ubi->wl_lock);
692
693 return peb;
694}
695#endif
696
431/** 697/**
432 * prot_queue_del - remove a physical eraseblock from the protection queue. 698 * prot_queue_del - remove a physical eraseblock from the protection queue.
433 * @ubi: UBI device description object 699 * @ubi: UBI device description object
@@ -558,14 +824,14 @@ repeat:
558} 824}
559 825
560/** 826/**
561 * schedule_ubi_work - schedule a work. 827 * __schedule_ubi_work - schedule a work.
562 * @ubi: UBI device description object 828 * @ubi: UBI device description object
563 * @wrk: the work to schedule 829 * @wrk: the work to schedule
564 * 830 *
565 * This function adds a work defined by @wrk to the tail of the pending works 831 * This function adds a work defined by @wrk to the tail of the pending works
566 * list. 832 * list. Can only be used of ubi->work_sem is already held in read mode!
567 */ 833 */
568static void schedule_ubi_work(struct ubi_device *ubi, struct ubi_work *wrk) 834static void __schedule_ubi_work(struct ubi_device *ubi, struct ubi_work *wrk)
569{ 835{
570 spin_lock(&ubi->wl_lock); 836 spin_lock(&ubi->wl_lock);
571 list_add_tail(&wrk->list, &ubi->works); 837 list_add_tail(&wrk->list, &ubi->works);
@@ -576,9 +842,35 @@ static void schedule_ubi_work(struct ubi_device *ubi, struct ubi_work *wrk)
576 spin_unlock(&ubi->wl_lock); 842 spin_unlock(&ubi->wl_lock);
577} 843}
578 844
845/**
846 * schedule_ubi_work - schedule a work.
847 * @ubi: UBI device description object
848 * @wrk: the work to schedule
849 *
850 * This function adds a work defined by @wrk to the tail of the pending works
851 * list.
852 */
853static void schedule_ubi_work(struct ubi_device *ubi, struct ubi_work *wrk)
854{
855 down_read(&ubi->work_sem);
856 __schedule_ubi_work(ubi, wrk);
857 up_read(&ubi->work_sem);
858}
859
579static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk, 860static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
580 int cancel); 861 int cancel);
581 862
863#ifdef CONFIG_MTD_UBI_FASTMAP
864/**
865 * ubi_is_erase_work - checks whether a work is erase work.
866 * @wrk: The work object to be checked
867 */
868int ubi_is_erase_work(struct ubi_work *wrk)
869{
870 return wrk->func == erase_worker;
871}
872#endif
873
582/** 874/**
583 * schedule_erase - schedule an erase work. 875 * schedule_erase - schedule an erase work.
584 * @ubi: UBI device description object 876 * @ubi: UBI device description object
@@ -595,6 +887,9 @@ static int schedule_erase(struct ubi_device *ubi, struct ubi_wl_entry *e,
595{ 887{
596 struct ubi_work *wl_wrk; 888 struct ubi_work *wl_wrk;
597 889
890 ubi_assert(e);
891 ubi_assert(!ubi_is_fm_block(ubi, e->pnum));
892
598 dbg_wl("schedule erasure of PEB %d, EC %d, torture %d", 893 dbg_wl("schedule erasure of PEB %d, EC %d, torture %d",
599 e->pnum, e->ec, torture); 894 e->pnum, e->ec, torture);
600 895
@@ -613,6 +908,79 @@ static int schedule_erase(struct ubi_device *ubi, struct ubi_wl_entry *e,
613} 908}
614 909
615/** 910/**
911 * do_sync_erase - run the erase worker synchronously.
912 * @ubi: UBI device description object
913 * @e: the WL entry of the physical eraseblock to erase
914 * @vol_id: the volume ID that last used this PEB
915 * @lnum: the last used logical eraseblock number for the PEB
916 * @torture: if the physical eraseblock has to be tortured
917 *
918 */
919static int do_sync_erase(struct ubi_device *ubi, struct ubi_wl_entry *e,
920 int vol_id, int lnum, int torture)
921{
922 struct ubi_work *wl_wrk;
923
924 dbg_wl("sync erase of PEB %i", e->pnum);
925
926 wl_wrk = kmalloc(sizeof(struct ubi_work), GFP_NOFS);
927 if (!wl_wrk)
928 return -ENOMEM;
929
930 wl_wrk->e = e;
931 wl_wrk->vol_id = vol_id;
932 wl_wrk->lnum = lnum;
933 wl_wrk->torture = torture;
934
935 return erase_worker(ubi, wl_wrk, 0);
936}
937
938#ifdef CONFIG_MTD_UBI_FASTMAP
939/**
940 * ubi_wl_put_fm_peb - returns a PEB used in a fastmap to the wear-leveling
941 * sub-system.
942 * see: ubi_wl_put_peb()
943 *
944 * @ubi: UBI device description object
945 * @fm_e: physical eraseblock to return
946 * @lnum: the last used logical eraseblock number for the PEB
947 * @torture: if this physical eraseblock has to be tortured
948 */
949int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *fm_e,
950 int lnum, int torture)
951{
952 struct ubi_wl_entry *e;
953 int vol_id, pnum = fm_e->pnum;
954
955 dbg_wl("PEB %d", pnum);
956
957 ubi_assert(pnum >= 0);
958 ubi_assert(pnum < ubi->peb_count);
959
960 spin_lock(&ubi->wl_lock);
961 e = ubi->lookuptbl[pnum];
962
963 /* This can happen if we recovered from a fastmap the very
964 * first time and writing now a new one. In this case the wl system
965 * has never seen any PEB used by the original fastmap.
966 */
967 if (!e) {
968 e = fm_e;
969 ubi_assert(e->ec >= 0);
970 ubi->lookuptbl[pnum] = e;
971 } else {
972 e->ec = fm_e->ec;
973 kfree(fm_e);
974 }
975
976 spin_unlock(&ubi->wl_lock);
977
978 vol_id = lnum ? UBI_FM_DATA_VOLUME_ID : UBI_FM_SB_VOLUME_ID;
979 return schedule_erase(ubi, e, vol_id, lnum, torture);
980}
981#endif
982
983/**
616 * wear_leveling_worker - wear-leveling worker function. 984 * wear_leveling_worker - wear-leveling worker function.
617 * @ubi: UBI device description object 985 * @ubi: UBI device description object
618 * @wrk: the work object 986 * @wrk: the work object
@@ -627,6 +995,9 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
627{ 995{
628 int err, scrubbing = 0, torture = 0, protect = 0, erroneous = 0; 996 int err, scrubbing = 0, torture = 0, protect = 0, erroneous = 0;
629 int vol_id = -1, uninitialized_var(lnum); 997 int vol_id = -1, uninitialized_var(lnum);
998#ifdef CONFIG_MTD_UBI_FASTMAP
999 int anchor = wrk->anchor;
1000#endif
630 struct ubi_wl_entry *e1, *e2; 1001 struct ubi_wl_entry *e1, *e2;
631 struct ubi_vid_hdr *vid_hdr; 1002 struct ubi_vid_hdr *vid_hdr;
632 1003
@@ -660,14 +1031,35 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
660 goto out_cancel; 1031 goto out_cancel;
661 } 1032 }
662 1033
1034#ifdef CONFIG_MTD_UBI_FASTMAP
1035 /* Check whether we need to produce an anchor PEB */
1036 if (!anchor)
1037 anchor = !anchor_pebs_avalible(&ubi->free);
1038
1039 if (anchor) {
1040 e1 = find_anchor_wl_entry(&ubi->used);
1041 if (!e1)
1042 goto out_cancel;
1043 e2 = get_peb_for_wl(ubi);
1044 if (!e2)
1045 goto out_cancel;
1046
1047 self_check_in_wl_tree(ubi, e1, &ubi->used);
1048 rb_erase(&e1->u.rb, &ubi->used);
1049 dbg_wl("anchor-move PEB %d to PEB %d", e1->pnum, e2->pnum);
1050 } else if (!ubi->scrub.rb_node) {
1051#else
663 if (!ubi->scrub.rb_node) { 1052 if (!ubi->scrub.rb_node) {
1053#endif
664 /* 1054 /*
665 * Now pick the least worn-out used physical eraseblock and a 1055 * Now pick the least worn-out used physical eraseblock and a
666 * highly worn-out free physical eraseblock. If the erase 1056 * highly worn-out free physical eraseblock. If the erase
667 * counters differ much enough, start wear-leveling. 1057 * counters differ much enough, start wear-leveling.
668 */ 1058 */
669 e1 = rb_entry(rb_first(&ubi->used), struct ubi_wl_entry, u.rb); 1059 e1 = rb_entry(rb_first(&ubi->used), struct ubi_wl_entry, u.rb);
670 e2 = find_wl_entry(&ubi->free, WL_FREE_MAX_DIFF); 1060 e2 = get_peb_for_wl(ubi);
1061 if (!e2)
1062 goto out_cancel;
671 1063
672 if (!(e2->ec - e1->ec >= UBI_WL_THRESHOLD)) { 1064 if (!(e2->ec - e1->ec >= UBI_WL_THRESHOLD)) {
673 dbg_wl("no WL needed: min used EC %d, max free EC %d", 1065 dbg_wl("no WL needed: min used EC %d, max free EC %d",
@@ -682,14 +1074,15 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
682 /* Perform scrubbing */ 1074 /* Perform scrubbing */
683 scrubbing = 1; 1075 scrubbing = 1;
684 e1 = rb_entry(rb_first(&ubi->scrub), struct ubi_wl_entry, u.rb); 1076 e1 = rb_entry(rb_first(&ubi->scrub), struct ubi_wl_entry, u.rb);
685 e2 = find_wl_entry(&ubi->free, WL_FREE_MAX_DIFF); 1077 e2 = get_peb_for_wl(ubi);
1078 if (!e2)
1079 goto out_cancel;
1080
686 self_check_in_wl_tree(ubi, e1, &ubi->scrub); 1081 self_check_in_wl_tree(ubi, e1, &ubi->scrub);
687 rb_erase(&e1->u.rb, &ubi->scrub); 1082 rb_erase(&e1->u.rb, &ubi->scrub);
688 dbg_wl("scrub PEB %d to PEB %d", e1->pnum, e2->pnum); 1083 dbg_wl("scrub PEB %d to PEB %d", e1->pnum, e2->pnum);
689 } 1084 }
690 1085
691 self_check_in_wl_tree(ubi, e2, &ubi->free);
692 rb_erase(&e2->u.rb, &ubi->free);
693 ubi->move_from = e1; 1086 ubi->move_from = e1;
694 ubi->move_to = e2; 1087 ubi->move_to = e2;
695 spin_unlock(&ubi->wl_lock); 1088 spin_unlock(&ubi->wl_lock);
@@ -806,7 +1199,7 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
806 ubi->move_to_put = ubi->wl_scheduled = 0; 1199 ubi->move_to_put = ubi->wl_scheduled = 0;
807 spin_unlock(&ubi->wl_lock); 1200 spin_unlock(&ubi->wl_lock);
808 1201
809 err = schedule_erase(ubi, e1, vol_id, lnum, 0); 1202 err = do_sync_erase(ubi, e1, vol_id, lnum, 0);
810 if (err) { 1203 if (err) {
811 kmem_cache_free(ubi_wl_entry_slab, e1); 1204 kmem_cache_free(ubi_wl_entry_slab, e1);
812 if (e2) 1205 if (e2)
@@ -821,7 +1214,7 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
821 */ 1214 */
822 dbg_wl("PEB %d (LEB %d:%d) was put meanwhile, erase", 1215 dbg_wl("PEB %d (LEB %d:%d) was put meanwhile, erase",
823 e2->pnum, vol_id, lnum); 1216 e2->pnum, vol_id, lnum);
824 err = schedule_erase(ubi, e2, vol_id, lnum, 0); 1217 err = do_sync_erase(ubi, e2, vol_id, lnum, 0);
825 if (err) { 1218 if (err) {
826 kmem_cache_free(ubi_wl_entry_slab, e2); 1219 kmem_cache_free(ubi_wl_entry_slab, e2);
827 goto out_ro; 1220 goto out_ro;
@@ -860,7 +1253,7 @@ out_not_moved:
860 spin_unlock(&ubi->wl_lock); 1253 spin_unlock(&ubi->wl_lock);
861 1254
862 ubi_free_vid_hdr(ubi, vid_hdr); 1255 ubi_free_vid_hdr(ubi, vid_hdr);
863 err = schedule_erase(ubi, e2, vol_id, lnum, torture); 1256 err = do_sync_erase(ubi, e2, vol_id, lnum, torture);
864 if (err) { 1257 if (err) {
865 kmem_cache_free(ubi_wl_entry_slab, e2); 1258 kmem_cache_free(ubi_wl_entry_slab, e2);
866 goto out_ro; 1259 goto out_ro;
@@ -901,12 +1294,13 @@ out_cancel:
901/** 1294/**
902 * ensure_wear_leveling - schedule wear-leveling if it is needed. 1295 * ensure_wear_leveling - schedule wear-leveling if it is needed.
903 * @ubi: UBI device description object 1296 * @ubi: UBI device description object
1297 * @nested: set to non-zero if this function is called from UBI worker
904 * 1298 *
905 * This function checks if it is time to start wear-leveling and schedules it 1299 * This function checks if it is time to start wear-leveling and schedules it
906 * if yes. This function returns zero in case of success and a negative error 1300 * if yes. This function returns zero in case of success and a negative error
907 * code in case of failure. 1301 * code in case of failure.
908 */ 1302 */
909static int ensure_wear_leveling(struct ubi_device *ubi) 1303static int ensure_wear_leveling(struct ubi_device *ubi, int nested)
910{ 1304{
911 int err = 0; 1305 int err = 0;
912 struct ubi_wl_entry *e1; 1306 struct ubi_wl_entry *e1;
@@ -934,7 +1328,7 @@ static int ensure_wear_leveling(struct ubi_device *ubi)
934 * %UBI_WL_THRESHOLD. 1328 * %UBI_WL_THRESHOLD.
935 */ 1329 */
936 e1 = rb_entry(rb_first(&ubi->used), struct ubi_wl_entry, u.rb); 1330 e1 = rb_entry(rb_first(&ubi->used), struct ubi_wl_entry, u.rb);
937 e2 = find_wl_entry(&ubi->free, WL_FREE_MAX_DIFF); 1331 e2 = find_wl_entry(ubi, &ubi->free, WL_FREE_MAX_DIFF);
938 1332
939 if (!(e2->ec - e1->ec >= UBI_WL_THRESHOLD)) 1333 if (!(e2->ec - e1->ec >= UBI_WL_THRESHOLD))
940 goto out_unlock; 1334 goto out_unlock;
@@ -951,8 +1345,12 @@ static int ensure_wear_leveling(struct ubi_device *ubi)
951 goto out_cancel; 1345 goto out_cancel;
952 } 1346 }
953 1347
1348 wrk->anchor = 0;
954 wrk->func = &wear_leveling_worker; 1349 wrk->func = &wear_leveling_worker;
955 schedule_ubi_work(ubi, wrk); 1350 if (nested)
1351 __schedule_ubi_work(ubi, wrk);
1352 else
1353 schedule_ubi_work(ubi, wrk);
956 return err; 1354 return err;
957 1355
958out_cancel: 1356out_cancel:
@@ -963,6 +1361,38 @@ out_unlock:
963 return err; 1361 return err;
964} 1362}
965 1363
1364#ifdef CONFIG_MTD_UBI_FASTMAP
1365/**
1366 * ubi_ensure_anchor_pebs - schedule wear-leveling to produce an anchor PEB.
1367 * @ubi: UBI device description object
1368 */
1369int ubi_ensure_anchor_pebs(struct ubi_device *ubi)
1370{
1371 struct ubi_work *wrk;
1372
1373 spin_lock(&ubi->wl_lock);
1374 if (ubi->wl_scheduled) {
1375 spin_unlock(&ubi->wl_lock);
1376 return 0;
1377 }
1378 ubi->wl_scheduled = 1;
1379 spin_unlock(&ubi->wl_lock);
1380
1381 wrk = kmalloc(sizeof(struct ubi_work), GFP_NOFS);
1382 if (!wrk) {
1383 spin_lock(&ubi->wl_lock);
1384 ubi->wl_scheduled = 0;
1385 spin_unlock(&ubi->wl_lock);
1386 return -ENOMEM;
1387 }
1388
1389 wrk->anchor = 1;
1390 wrk->func = &wear_leveling_worker;
1391 schedule_ubi_work(ubi, wrk);
1392 return 0;
1393}
1394#endif
1395
966/** 1396/**
967 * erase_worker - physical eraseblock erase worker function. 1397 * erase_worker - physical eraseblock erase worker function.
968 * @ubi: UBI device description object 1398 * @ubi: UBI device description object
@@ -993,6 +1423,8 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
993 dbg_wl("erase PEB %d EC %d LEB %d:%d", 1423 dbg_wl("erase PEB %d EC %d LEB %d:%d",
994 pnum, e->ec, wl_wrk->vol_id, wl_wrk->lnum); 1424 pnum, e->ec, wl_wrk->vol_id, wl_wrk->lnum);
995 1425
1426 ubi_assert(!ubi_is_fm_block(ubi, e->pnum));
1427
996 err = sync_erase(ubi, e, wl_wrk->torture); 1428 err = sync_erase(ubi, e, wl_wrk->torture);
997 if (!err) { 1429 if (!err) {
998 /* Fine, we've erased it successfully */ 1430 /* Fine, we've erased it successfully */
@@ -1000,6 +1432,7 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
1000 1432
1001 spin_lock(&ubi->wl_lock); 1433 spin_lock(&ubi->wl_lock);
1002 wl_tree_add(e, &ubi->free); 1434 wl_tree_add(e, &ubi->free);
1435 ubi->free_count++;
1003 spin_unlock(&ubi->wl_lock); 1436 spin_unlock(&ubi->wl_lock);
1004 1437
1005 /* 1438 /*
@@ -1009,7 +1442,7 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
1009 serve_prot_queue(ubi); 1442 serve_prot_queue(ubi);
1010 1443
1011 /* And take care about wear-leveling */ 1444 /* And take care about wear-leveling */
1012 err = ensure_wear_leveling(ubi); 1445 err = ensure_wear_leveling(ubi, 1);
1013 return err; 1446 return err;
1014 } 1447 }
1015 1448
@@ -1247,7 +1680,7 @@ retry:
1247 * Technically scrubbing is the same as wear-leveling, so it is done 1680 * Technically scrubbing is the same as wear-leveling, so it is done
1248 * by the WL worker. 1681 * by the WL worker.
1249 */ 1682 */
1250 return ensure_wear_leveling(ubi); 1683 return ensure_wear_leveling(ubi, 0);
1251} 1684}
1252 1685
1253/** 1686/**
@@ -1428,7 +1861,7 @@ static void cancel_pending(struct ubi_device *ubi)
1428 */ 1861 */
1429int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai) 1862int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
1430{ 1863{
1431 int err, i; 1864 int err, i, reserved_pebs, found_pebs = 0;
1432 struct rb_node *rb1, *rb2; 1865 struct rb_node *rb1, *rb2;
1433 struct ubi_ainf_volume *av; 1866 struct ubi_ainf_volume *av;
1434 struct ubi_ainf_peb *aeb, *tmp; 1867 struct ubi_ainf_peb *aeb, *tmp;
@@ -1440,6 +1873,9 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
1440 init_rwsem(&ubi->work_sem); 1873 init_rwsem(&ubi->work_sem);
1441 ubi->max_ec = ai->max_ec; 1874 ubi->max_ec = ai->max_ec;
1442 INIT_LIST_HEAD(&ubi->works); 1875 INIT_LIST_HEAD(&ubi->works);
1876#ifdef CONFIG_MTD_UBI_FASTMAP
1877 INIT_WORK(&ubi->fm_work, update_fastmap_work_fn);
1878#endif
1443 1879
1444 sprintf(ubi->bgt_name, UBI_BGT_NAME_PATTERN, ubi->ubi_num); 1880 sprintf(ubi->bgt_name, UBI_BGT_NAME_PATTERN, ubi->ubi_num);
1445 1881
@@ -1461,13 +1897,17 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
1461 1897
1462 e->pnum = aeb->pnum; 1898 e->pnum = aeb->pnum;
1463 e->ec = aeb->ec; 1899 e->ec = aeb->ec;
1900 ubi_assert(!ubi_is_fm_block(ubi, e->pnum));
1464 ubi->lookuptbl[e->pnum] = e; 1901 ubi->lookuptbl[e->pnum] = e;
1465 if (schedule_erase(ubi, e, aeb->vol_id, aeb->lnum, 0)) { 1902 if (schedule_erase(ubi, e, aeb->vol_id, aeb->lnum, 0)) {
1466 kmem_cache_free(ubi_wl_entry_slab, e); 1903 kmem_cache_free(ubi_wl_entry_slab, e);
1467 goto out_free; 1904 goto out_free;
1468 } 1905 }
1906
1907 found_pebs++;
1469 } 1908 }
1470 1909
1910 ubi->free_count = 0;
1471 list_for_each_entry(aeb, &ai->free, u.list) { 1911 list_for_each_entry(aeb, &ai->free, u.list) {
1472 cond_resched(); 1912 cond_resched();
1473 1913
@@ -1478,8 +1918,14 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
1478 e->pnum = aeb->pnum; 1918 e->pnum = aeb->pnum;
1479 e->ec = aeb->ec; 1919 e->ec = aeb->ec;
1480 ubi_assert(e->ec >= 0); 1920 ubi_assert(e->ec >= 0);
1921 ubi_assert(!ubi_is_fm_block(ubi, e->pnum));
1922
1481 wl_tree_add(e, &ubi->free); 1923 wl_tree_add(e, &ubi->free);
1924 ubi->free_count++;
1925
1482 ubi->lookuptbl[e->pnum] = e; 1926 ubi->lookuptbl[e->pnum] = e;
1927
1928 found_pebs++;
1483 } 1929 }
1484 1930
1485 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) { 1931 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) {
@@ -1493,6 +1939,7 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
1493 e->pnum = aeb->pnum; 1939 e->pnum = aeb->pnum;
1494 e->ec = aeb->ec; 1940 e->ec = aeb->ec;
1495 ubi->lookuptbl[e->pnum] = e; 1941 ubi->lookuptbl[e->pnum] = e;
1942
1496 if (!aeb->scrub) { 1943 if (!aeb->scrub) {
1497 dbg_wl("add PEB %d EC %d to the used tree", 1944 dbg_wl("add PEB %d EC %d to the used tree",
1498 e->pnum, e->ec); 1945 e->pnum, e->ec);
@@ -1502,22 +1949,38 @@ int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
1502 e->pnum, e->ec); 1949 e->pnum, e->ec);
1503 wl_tree_add(e, &ubi->scrub); 1950 wl_tree_add(e, &ubi->scrub);
1504 } 1951 }
1952
1953 found_pebs++;
1505 } 1954 }
1506 } 1955 }
1507 1956
1508 if (ubi->avail_pebs < WL_RESERVED_PEBS) { 1957 dbg_wl("found %i PEBs", found_pebs);
1958
1959 if (ubi->fm)
1960 ubi_assert(ubi->good_peb_count == \
1961 found_pebs + ubi->fm->used_blocks);
1962 else
1963 ubi_assert(ubi->good_peb_count == found_pebs);
1964
1965 reserved_pebs = WL_RESERVED_PEBS;
1966#ifdef CONFIG_MTD_UBI_FASTMAP
1967 /* Reserve enough LEBs to store two fastmaps. */
1968 reserved_pebs += (ubi->fm_size / ubi->leb_size) * 2;
1969#endif
1970
1971 if (ubi->avail_pebs < reserved_pebs) {
1509 ubi_err("no enough physical eraseblocks (%d, need %d)", 1972 ubi_err("no enough physical eraseblocks (%d, need %d)",
1510 ubi->avail_pebs, WL_RESERVED_PEBS); 1973 ubi->avail_pebs, reserved_pebs);
1511 if (ubi->corr_peb_count) 1974 if (ubi->corr_peb_count)
1512 ubi_err("%d PEBs are corrupted and not used", 1975 ubi_err("%d PEBs are corrupted and not used",
1513 ubi->corr_peb_count); 1976 ubi->corr_peb_count);
1514 goto out_free; 1977 goto out_free;
1515 } 1978 }
1516 ubi->avail_pebs -= WL_RESERVED_PEBS; 1979 ubi->avail_pebs -= reserved_pebs;
1517 ubi->rsvd_pebs += WL_RESERVED_PEBS; 1980 ubi->rsvd_pebs += reserved_pebs;
1518 1981
1519 /* Schedule wear-leveling if needed */ 1982 /* Schedule wear-leveling if needed */
1520 err = ensure_wear_leveling(ubi); 1983 err = ensure_wear_leveling(ubi, 0);
1521 if (err) 1984 if (err)
1522 goto out_free; 1985 goto out_free;
1523 1986
@@ -1596,7 +2059,7 @@ static int self_check_ec(struct ubi_device *ubi, int pnum, int ec)
1596 } 2059 }
1597 2060
1598 read_ec = be64_to_cpu(ec_hdr->ec); 2061 read_ec = be64_to_cpu(ec_hdr->ec);
1599 if (ec != read_ec) { 2062 if (ec != read_ec && read_ec - ec > 1) {
1600 ubi_err("self-check failed for PEB %d", pnum); 2063 ubi_err("self-check failed for PEB %d", pnum);
1601 ubi_err("read EC is %lld, should be %d", read_ec, ec); 2064 ubi_err("read EC is %lld, should be %d", read_ec, ec);
1602 dump_stack(); 2065 dump_stack();
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-02 02:17:47 -0500