2bb7774fc6dcd597de4ffa022bb2779ba441485e
[openwrt/svn-archive/archive.git] / target / linux / generic / patches-3.10 / 400-rootfs_split.patch
1 --- a/drivers/mtd/Kconfig
2 +++ b/drivers/mtd/Kconfig
3 @@ -23,6 +23,14 @@ config MTD_TESTS
4 WARNING: some of the tests will ERASE entire MTD device which they
5 test. Do not use these tests unless you really know what you do.
6
7 +config MTD_ROOTFS_ROOT_DEV
8 + bool "Automatically set 'rootfs' partition to be root filesystem"
9 + default y
10 +
11 +config MTD_ROOTFS_SPLIT
12 + bool "Automatically split 'rootfs' partition for squashfs"
13 + default y
14 +
15 config MTD_REDBOOT_PARTS
16 tristate "RedBoot partition table parsing"
17 ---help---
18 --- a/drivers/mtd/mtdpart.c
19 +++ b/drivers/mtd/mtdpart.c
20 @@ -29,6 +29,8 @@
21 #include <linux/kmod.h>
22 #include <linux/mtd/mtd.h>
23 #include <linux/mtd/partitions.h>
24 +#include <linux/root_dev.h>
25 +#include <linux/magic.h>
26 #include <linux/err.h>
27
28 #include "mtdcore.h"
29 @@ -50,7 +52,7 @@ struct mtd_part {
30 * the pointer to that structure with this macro.
31 */
32 #define PART(x) ((struct mtd_part *)(x))
33 -
34 +#define IS_PART(mtd) (mtd->_read == part_read)
35
36 /*
37 * MTD methods which simply translate the effective address and pass through
38 @@ -613,6 +615,144 @@ int mtd_del_partition(struct mtd_info *m
39 }
40 EXPORT_SYMBOL_GPL(mtd_del_partition);
41
42 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
43 +#define ROOTFS_SPLIT_NAME "rootfs_data"
44 +#define ROOTFS_REMOVED_NAME "<removed>"
45 +
46 +struct squashfs_super_block {
47 + __le32 s_magic;
48 + __le32 pad0[9];
49 + __le64 bytes_used;
50 +};
51 +
52 +
53 +static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
54 +{
55 + struct squashfs_super_block sb;
56 + int len, ret;
57 +
58 + ret = mtd_read(master, offset, sizeof(sb), &len, (void *) &sb);
59 + if (ret || (len != sizeof(sb))) {
60 + printk(KERN_ALERT "split_squashfs: error occured while reading "
61 + "from \"%s\"\n", master->name);
62 + return -EINVAL;
63 + }
64 +
65 + if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) ) {
66 + printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
67 + master->name);
68 + *split_offset = 0;
69 + return 0;
70 + }
71 +
72 + if (le64_to_cpu((sb.bytes_used)) <= 0) {
73 + printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
74 + master->name);
75 + *split_offset = 0;
76 + return 0;
77 + }
78 +
79 + len = (u32) le64_to_cpu(sb.bytes_used);
80 + len += (offset & 0x000fffff);
81 + len += (master->erasesize - 1);
82 + len &= ~(master->erasesize - 1);
83 + len -= (offset & 0x000fffff);
84 + *split_offset = offset + len;
85 +
86 + return 0;
87 +}
88 +
89 +static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part)
90 +{
91 + struct mtd_partition dpart;
92 + struct mtd_part *slave = NULL;
93 + struct mtd_part *spart;
94 + int ret, split_offset = 0;
95 +
96 + spart = PART(rpart);
97 + ret = split_squashfs(master, spart->offset, &split_offset);
98 + if (ret)
99 + return ret;
100 +
101 + if (split_offset <= 0)
102 + return 0;
103 +
104 + memcpy(&dpart, part, sizeof(dpart));
105 + dpart.name = ROOTFS_SPLIT_NAME;
106 +
107 + dpart.size = rpart->size - (split_offset - spart->offset);
108 + dpart.offset = split_offset;
109 +
110 + printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n",
111 + ROOTFS_SPLIT_NAME, dpart.offset, dpart.size);
112 +
113 + slave = allocate_partition(master, &dpart, 0, split_offset);
114 + if (IS_ERR(slave))
115 + return PTR_ERR(slave);
116 + mutex_lock(&mtd_partitions_mutex);
117 + list_add(&slave->list, &mtd_partitions);
118 + mutex_unlock(&mtd_partitions_mutex);
119 +
120 + add_mtd_device(&slave->mtd);
121 +
122 + rpart->split = &slave->mtd;
123 +
124 + return 0;
125 +}
126 +
127 +static int refresh_rootfs_split(struct mtd_info *mtd)
128 +{
129 + struct mtd_partition tpart;
130 + struct mtd_part *part;
131 + char *name;
132 + //int index = 0;
133 + int offset, size;
134 + int ret;
135 +
136 + part = PART(mtd);
137 +
138 + /* check for the new squashfs offset first */
139 + ret = split_squashfs(part->master, part->offset, &offset);
140 + if (ret)
141 + return ret;
142 +
143 + if ((offset > 0) && !mtd->split) {
144 + printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
145 + /* if we don't have a rootfs split partition, create a new one */
146 + tpart.name = (char *) mtd->name;
147 + tpart.size = mtd->size;
148 + tpart.offset = part->offset;
149 +
150 + return split_rootfs_data(part->master, &part->mtd, &tpart);
151 + } else if ((offset > 0) && mtd->split) {
152 + /* update the offsets of the existing partition */
153 + size = mtd->size + part->offset - offset;
154 +
155 + part = PART(mtd->split);
156 + part->offset = offset;
157 + part->mtd.size = size;
158 + printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
159 + __func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
160 + (u32) part->offset, (u32) part->mtd.size);
161 + name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
162 + strcpy(name, ROOTFS_SPLIT_NAME);
163 + part->mtd.name = name;
164 + } else if ((offset <= 0) && mtd->split) {
165 + printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
166 +
167 + /* mark existing partition as removed */
168 + part = PART(mtd->split);
169 + name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
170 + strcpy(name, ROOTFS_REMOVED_NAME);
171 + part->mtd.name = name;
172 + part->offset = 0;
173 + part->mtd.size = 0;
174 + }
175 +
176 + return 0;
177 +}
178 +#endif /* CONFIG_MTD_ROOTFS_SPLIT */
179 +
180 /*
181 * This function, given a master MTD object and a partition table, creates
182 * and registers slave MTD objects which are bound to the master according to
183 @@ -629,6 +769,9 @@ int add_mtd_partitions(struct mtd_info *
184 struct mtd_part *slave;
185 uint64_t cur_offset = 0;
186 int i;
187 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
188 + int ret;
189 +#endif
190
191 printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
192
193 @@ -643,12 +786,53 @@ int add_mtd_partitions(struct mtd_info *
194
195 add_mtd_device(&slave->mtd);
196
197 + if (!strcmp(parts[i].name, "rootfs")) {
198 +#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
199 + if (ROOT_DEV == 0) {
200 + printk(KERN_NOTICE "mtd: partition \"rootfs\" "
201 + "set to be root filesystem\n");
202 + ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
203 + }
204 +#endif
205 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
206 + ret = split_rootfs_data(master, &slave->mtd, &parts[i]);
207 + /* if (ret == 0)
208 + * j++; */
209 +#endif
210 + }
211 +
212 cur_offset = slave->offset + slave->mtd.size;
213 }
214
215 return 0;
216 }
217
218 +int mtd_device_refresh(struct mtd_info *mtd)
219 +{
220 + int ret = 0;
221 +
222 + if (IS_PART(mtd)) {
223 + struct mtd_part *part;
224 + struct mtd_info *master;
225 +
226 + part = PART(mtd);
227 + master = part->master;
228 + if (master->refresh_device)
229 + ret = master->refresh_device(master);
230 + }
231 +
232 + if (!ret && mtd->refresh_device)
233 + ret = mtd->refresh_device(mtd);
234 +
235 +#ifdef CONFIG_MTD_ROOTFS_SPLIT
236 + if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
237 + refresh_rootfs_split(mtd);
238 +#endif
239 +
240 + return 0;
241 +}
242 +EXPORT_SYMBOL_GPL(mtd_device_refresh);
243 +
244 static DEFINE_SPINLOCK(part_parser_lock);
245 static LIST_HEAD(part_parsers);
246
247 --- a/drivers/mtd/mtdchar.c
248 +++ b/drivers/mtd/mtdchar.c
249 @@ -1010,6 +1010,12 @@ static int mtdchar_ioctl(struct file *fi
250 break;
251 }
252
253 + case MTDREFRESH:
254 + {
255 + ret = mtd_device_refresh(mtd);
256 + break;
257 + }
258 +
259 default:
260 ret = -ENOTTY;
261 }
262 --- a/include/linux/mtd/mtd.h
263 +++ b/include/linux/mtd/mtd.h
264 @@ -114,6 +114,7 @@ struct nand_ecclayout {
265
266 struct module; /* only needed for owner field in mtd_info */
267
268 +struct mtd_info;
269 struct mtd_info {
270 u_char type;
271 uint32_t flags;
272 @@ -226,6 +227,9 @@ struct mtd_info {
273 int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
274 int (*_suspend) (struct mtd_info *mtd);
275 void (*_resume) (struct mtd_info *mtd);
276 + int (*refresh_device)(struct mtd_info *mtd);
277 + struct mtd_info *split;
278 +
279 /*
280 * If the driver is something smart, like UBI, it may need to maintain
281 * its own reference counting. The below functions are only for driver.
282 @@ -368,6 +372,7 @@ extern int mtd_device_parse_register(str
283 int defnr_parts);
284 #define mtd_device_register(master, parts, nr_parts) \
285 mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
286 +extern int mtd_device_refresh(struct mtd_info *master);
287 extern int mtd_device_unregister(struct mtd_info *master);
288 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
289 extern int __get_mtd_device(struct mtd_info *mtd);
290 --- a/include/linux/mtd/partitions.h
291 +++ b/include/linux/mtd/partitions.h
292 @@ -36,12 +36,14 @@
293 * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
294 */
295
296 +struct mtd_partition;
297 struct mtd_partition {
298 char *name; /* identifier string */
299 uint64_t size; /* partition size */
300 uint64_t offset; /* offset within the master MTD space */
301 uint32_t mask_flags; /* master MTD flags to mask out for this partition */
302 struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only) */
303 + int (*refresh_partition)(struct mtd_info *);
304 };
305
306 #define MTDPART_OFS_RETAIN (-3)
307 --- a/include/uapi/mtd/mtd-abi.h
308 +++ b/include/uapi/mtd/mtd-abi.h
309 @@ -202,6 +202,7 @@ struct otp_info {
310 * without OOB, e.g., NOR flash.
311 */
312 #define MEMWRITE _IOWR('M', 24, struct mtd_write_req)
313 +#define MTDREFRESH _IO('M', 50)
314
315 /*
316 * Obsolete legacy interface. Keep it in order not to break userspace