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openwrt/target/linux/generic-2.6/patches/060-rootfs_split.patch
Gabor Juhos 6761ddd557 refresh generic 2.6.21 patches 
SVN-Revision: 11185
2008-05-18 20:23:20 +00:00

493 lines
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Index: linux-2.6.21.7/drivers/mtd/Kconfig
===================================================================
--- linux-2.6.21.7.orig/drivers/mtd/Kconfig
+++ linux-2.6.21.7/drivers/mtd/Kconfig
@@ -49,6 +49,16 @@ config MTD_PARTITIONS
devices. Partitioning on NFTL 'devices' is a different - that's the
'normal' form of partitioning used on a block device.
+config MTD_ROOTFS_ROOT_DEV
+ bool "Automatically set 'rootfs' partition to be root filesystem"
+ depends on MTD_PARTITIONS
+ default y
+
+config MTD_ROOTFS_SPLIT
+ bool "Automatically split 'rootfs' partition for squashfs"
+ depends on MTD_PARTITIONS
+ default y
+
config MTD_REDBOOT_PARTS
tristate "RedBoot partition table parsing"
depends on MTD_PARTITIONS
Index: linux-2.6.21.7/drivers/mtd/mtdpart.c
===================================================================
--- linux-2.6.21.7.orig/drivers/mtd/mtdpart.c
+++ linux-2.6.21.7/drivers/mtd/mtdpart.c
@@ -20,6 +20,8 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/compatmac.h>
+#include <linux/squashfs_fs.h>
+#include <linux/root_dev.h>
/* Our partition linked list */
static LIST_HEAD(mtd_partitions);
@@ -308,6 +310,266 @@ int del_mtd_partitions(struct mtd_info *
return 0;
}
+static u_int32_t cur_offset = 0;
+static int add_one_partition(struct mtd_info *master, const struct mtd_partition *part,
+ int i, struct mtd_part **slp)
+{
+ struct mtd_part *slave;
+
+ /* allocate the partition structure */
+ slave = kzalloc (sizeof(*slave), GFP_KERNEL);
+ if (!slave) {
+ printk ("memory allocation error while creating partitions for \"%s\"\n",
+ master->name);
+ del_mtd_partitions(master);
+ return -ENOMEM;
+ }
+ list_add(&slave->list, &mtd_partitions);
+
+ /* set up the MTD object for this partition */
+ slave->mtd.type = master->type;
+ slave->mtd.flags = master->flags & ~part->mask_flags;
+ slave->mtd.size = part->size;
+ slave->mtd.writesize = master->writesize;
+ slave->mtd.oobsize = master->oobsize;
+ slave->mtd.oobavail = master->oobavail;
+ slave->mtd.subpage_sft = master->subpage_sft;
+
+ slave->mtd.name = part->name;
+ slave->mtd.bank_size = master->bank_size;
+ slave->mtd.owner = master->owner;
+
+ slave->mtd.read = part_read;
+ slave->mtd.write = part_write;
+
+ if(master->point && master->unpoint){
+ slave->mtd.point = part_point;
+ slave->mtd.unpoint = part_unpoint;
+ }
+
+ if (master->read_oob)
+ slave->mtd.read_oob = part_read_oob;
+ if (master->write_oob)
+ slave->mtd.write_oob = part_write_oob;
+ if(master->read_user_prot_reg)
+ slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
+ if(master->read_fact_prot_reg)
+ slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
+ if(master->write_user_prot_reg)
+ slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
+ if(master->lock_user_prot_reg)
+ slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
+ if(master->get_user_prot_info)
+ slave->mtd.get_user_prot_info = part_get_user_prot_info;
+ if(master->get_fact_prot_info)
+ slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
+ if (master->sync)
+ slave->mtd.sync = part_sync;
+ if (!i && master->suspend && master->resume) {
+ slave->mtd.suspend = part_suspend;
+ slave->mtd.resume = part_resume;
+ }
+ if (master->writev)
+ slave->mtd.writev = part_writev;
+ if (master->lock)
+ slave->mtd.lock = part_lock;
+ if (master->unlock)
+ slave->mtd.unlock = part_unlock;
+ if (master->block_isbad)
+ slave->mtd.block_isbad = part_block_isbad;
+ if (master->block_markbad)
+ slave->mtd.block_markbad = part_block_markbad;
+ slave->mtd.erase = part_erase;
+ slave->master = master;
+ slave->offset = part->offset;
+ slave->index = i;
+
+ if (slave->offset == MTDPART_OFS_APPEND)
+ slave->offset = cur_offset;
+ if (slave->offset == MTDPART_OFS_NXTBLK) {
+ slave->offset = cur_offset;
+ if ((cur_offset % master->erasesize) != 0) {
+ /* Round up to next erasesize */
+ slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
+ printk(KERN_NOTICE "Moving partition %d: "
+ "0x%08x -> 0x%08x\n", i,
+ cur_offset, slave->offset);
+ }
+ }
+ if (slave->mtd.size == MTDPART_SIZ_FULL)
+ slave->mtd.size = master->size - slave->offset;
+ cur_offset = slave->offset + slave->mtd.size;
+
+ printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
+ slave->offset + slave->mtd.size, slave->mtd.name);
+
+ /* let's do some sanity checks */
+ if (slave->offset >= master->size) {
+ /* let's register it anyway to preserve ordering */
+ slave->offset = 0;
+ slave->mtd.size = 0;
+ printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
+ part->name);
+ }
+ if (slave->offset + slave->mtd.size > master->size) {
+ slave->mtd.size = master->size - slave->offset;
+ printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
+ part->name, master->name, slave->mtd.size);
+ }
+ if (master->numeraseregions>1) {
+ /* Deal with variable erase size stuff */
+ int i;
+ struct mtd_erase_region_info *regions = master->eraseregions;
+
+ /* Find the first erase regions which is part of this partition. */
+ for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
+ ;
+
+ for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
+ if (slave->mtd.erasesize < regions[i].erasesize) {
+ slave->mtd.erasesize = regions[i].erasesize;
+ }
+ }
+ } else {
+ /* Single erase size */
+ slave->mtd.erasesize = master->erasesize;
+ }
+
+ if ((slave->mtd.flags & MTD_WRITEABLE) &&
+ (slave->offset % slave->mtd.erasesize)) {
+ /* Doesn't start on a boundary of major erase size */
+ /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
+ slave->mtd.flags &= ~MTD_WRITEABLE;
+ printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
+ part->name);
+ }
+ if ((slave->mtd.flags & MTD_WRITEABLE) &&
+ (slave->mtd.size % slave->mtd.erasesize)) {
+ slave->mtd.flags &= ~MTD_WRITEABLE;
+ printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
+ part->name);
+ }
+
+ slave->mtd.ecclayout = master->ecclayout;
+ if (master->block_isbad) {
+ uint32_t offs = 0;
+
+ while(offs < slave->mtd.size) {
+ if (master->block_isbad(master,
+ offs + slave->offset))
+ slave->mtd.ecc_stats.badblocks++;
+ offs += slave->mtd.erasesize;
+ }
+ }
+
+ if(part->mtdp)
+ { /* store the object pointer (caller may or may not register it */
+ *part->mtdp = &slave->mtd;
+ slave->registered = 0;
+ }
+ else
+ {
+ /* register our partition */
+ add_mtd_device(&slave->mtd);
+ slave->registered = 1;
+ }
+
+ if (slp)
+ *slp = slave;
+
+ return 0;
+}
+
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
+#define ROOTFS_SPLIT_NAME "rootfs_data"
+static int split_squashfs(struct mtd_info *master, struct mtd_partition *old,
+ struct mtd_partition **new)
+{
+ struct mtd_partition *part = NULL;
+ int len;
+ char buf[512];
+ struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
+ int ret;
+
+ ret = master->read(master, old->offset, sizeof(*sb), &len, buf);
+ if (ret) {
+ printk(KERN_ALERT "split_squashfs: error occured while reading "
+ "from \"%s\"\n", master->name);
+ goto out;
+ }
+
+ if (len != sizeof(*sb)) {
+ printk(KERN_ALERT "split_squashfs: unable to read superblock "
+ "from \"%s\"\n", master->name);
+ ret=-1;
+ goto out;
+ }
+
+ if (*((u32 *) buf) != SQUASHFS_MAGIC) {
+ printk(KERN_ALERT "split_squasfs: no squashfs found in \"%s\"\n",
+ master->name);
+ ret=0;
+ goto out;
+ }
+
+ if (sb->bytes_used <= 0) {
+ printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
+ master->name);
+ ret=0;
+ goto out;
+ }
+
+ part = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
+ if (part == NULL) {
+ printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
+ ROOTFS_SPLIT_NAME);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ memcpy(part, old, sizeof(*part));
+ part->name = (unsigned char *)&part[1];
+ strcpy(part->name, ROOTFS_SPLIT_NAME);
+
+ len = (u32) sb->bytes_used;
+ len += (part->offset & 0x000fffff);
+ len += (master->erasesize - 1);
+ len &= ~(master->erasesize - 1);
+ len -= (part->offset & 0x000fffff);
+ part->offset += len;
+ part->size -= len;
+
+ ret = 0;
+
+out:
+ *new = part;
+ return ret;
+}
+
+static int split_rootfs_data(struct mtd_info *master, struct mtd_partition *part,
+ int index)
+{
+ struct mtd_partition *dpart;
+ int ret;
+
+ ret = split_squashfs(master, part, &dpart);
+ if (ret)
+ return ret;
+
+ if (dpart == NULL)
+ return 1;
+
+ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%X, len=%X \n",
+ ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
+
+ ret = add_one_partition(master, dpart, index, NULL);
+ if (ret)
+ kfree(dpart);
+
+ return ret;
+}
+#endif /* CONFIG_MTD_ROOTFS_SPLIT */
+
/*
* This function, given a master MTD object and a partition table, creates
* and registers slave MTD objects which are bound to the master according to
@@ -320,169 +582,31 @@ int add_mtd_partitions(struct mtd_info *
int nbparts)
{
struct mtd_part *slave;
- u_int32_t cur_offset = 0;
- int i;
+ struct mtd_partition *part;
+ int i, j, ret = 0;
printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
- for (i = 0; i < nbparts; i++) {
-
- /* allocate the partition structure */
- slave = kzalloc (sizeof(*slave), GFP_KERNEL);
- if (!slave) {
- printk ("memory allocation error while creating partitions for \"%s\"\n",
- master->name);
- del_mtd_partitions(master);
- return -ENOMEM;
- }
- list_add(&slave->list, &mtd_partitions);
-
- /* set up the MTD object for this partition */
- slave->mtd.type = master->type;
- slave->mtd.flags = master->flags & ~parts[i].mask_flags;
- slave->mtd.size = parts[i].size;
- slave->mtd.writesize = master->writesize;
- slave->mtd.oobsize = master->oobsize;
- slave->mtd.oobavail = master->oobavail;
- slave->mtd.subpage_sft = master->subpage_sft;
-
- slave->mtd.name = parts[i].name;
- slave->mtd.bank_size = master->bank_size;
- slave->mtd.owner = master->owner;
-
- slave->mtd.read = part_read;
- slave->mtd.write = part_write;
-
- if(master->point && master->unpoint){
- slave->mtd.point = part_point;
- slave->mtd.unpoint = part_unpoint;
- }
-
- if (master->read_oob)
- slave->mtd.read_oob = part_read_oob;
- if (master->write_oob)
- slave->mtd.write_oob = part_write_oob;
- if(master->read_user_prot_reg)
- slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
- if(master->read_fact_prot_reg)
- slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
- if(master->write_user_prot_reg)
- slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
- if(master->lock_user_prot_reg)
- slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
- if(master->get_user_prot_info)
- slave->mtd.get_user_prot_info = part_get_user_prot_info;
- if(master->get_fact_prot_info)
- slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
- if (master->sync)
- slave->mtd.sync = part_sync;
- if (!i && master->suspend && master->resume) {
- slave->mtd.suspend = part_suspend;
- slave->mtd.resume = part_resume;
- }
- if (master->writev)
- slave->mtd.writev = part_writev;
- if (master->lock)
- slave->mtd.lock = part_lock;
- if (master->unlock)
- slave->mtd.unlock = part_unlock;
- if (master->block_isbad)
- slave->mtd.block_isbad = part_block_isbad;
- if (master->block_markbad)
- slave->mtd.block_markbad = part_block_markbad;
- slave->mtd.erase = part_erase;
- slave->master = master;
- slave->offset = parts[i].offset;
- slave->index = i;
-
- if (slave->offset == MTDPART_OFS_APPEND)
- slave->offset = cur_offset;
- if (slave->offset == MTDPART_OFS_NXTBLK) {
- slave->offset = cur_offset;
- if ((cur_offset % master->erasesize) != 0) {
- /* Round up to next erasesize */
- slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
- printk(KERN_NOTICE "Moving partition %d: "
- "0x%08x -> 0x%08x\n", i,
- cur_offset, slave->offset);
- }
- }
- if (slave->mtd.size == MTDPART_SIZ_FULL)
- slave->mtd.size = master->size - slave->offset;
- cur_offset = slave->offset + slave->mtd.size;
-
- printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
- slave->offset + slave->mtd.size, slave->mtd.name);
-
- /* let's do some sanity checks */
- if (slave->offset >= master->size) {
- /* let's register it anyway to preserve ordering */
- slave->offset = 0;
- slave->mtd.size = 0;
- printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
- parts[i].name);
- }
- if (slave->offset + slave->mtd.size > master->size) {
- slave->mtd.size = master->size - slave->offset;
- printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
- parts[i].name, master->name, slave->mtd.size);
- }
- if (master->numeraseregions>1) {
- /* Deal with variable erase size stuff */
- int i;
- struct mtd_erase_region_info *regions = master->eraseregions;
-
- /* Find the first erase regions which is part of this partition. */
- for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
- ;
-
- for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
- if (slave->mtd.erasesize < regions[i].erasesize) {
- slave->mtd.erasesize = regions[i].erasesize;
- }
- }
- } else {
- /* Single erase size */
- slave->mtd.erasesize = master->erasesize;
- }
-
- if ((slave->mtd.flags & MTD_WRITEABLE) &&
- (slave->offset % slave->mtd.erasesize)) {
- /* Doesn't start on a boundary of major erase size */
- /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
- slave->mtd.flags &= ~MTD_WRITEABLE;
- printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
- parts[i].name);
- }
- if ((slave->mtd.flags & MTD_WRITEABLE) &&
- (slave->mtd.size % slave->mtd.erasesize)) {
- slave->mtd.flags &= ~MTD_WRITEABLE;
- printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
- parts[i].name);
- }
-
- slave->mtd.ecclayout = master->ecclayout;
- if (master->block_isbad) {
- uint32_t offs = 0;
-
- while(offs < slave->mtd.size) {
- if (master->block_isbad(master,
- offs + slave->offset))
- slave->mtd.ecc_stats.badblocks++;
- offs += slave->mtd.erasesize;
+ for (i = 0, j = 0; i < nbparts; i++) {
+ part = (struct mtd_partition *) &parts[i];
+ ret = add_one_partition(master, part, j, &slave);
+ if (ret)
+ return ret;
+ j++;
+
+ if (strcmp(part->name, "rootfs") == 0 && slave->registered) {
+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
+ if (ROOT_DEV == 0) {
+ printk(KERN_NOTICE "mtd: partition \"rootfs\" "
+ "set to be root filesystem\n");
+ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
}
- }
-
- if(parts[i].mtdp)
- { /* store the object pointer (caller may or may not register it */
- *parts[i].mtdp = &slave->mtd;
- slave->registered = 0;
- }
- else
- {
- /* register our partition */
- add_mtd_device(&slave->mtd);
- slave->registered = 1;
+#endif
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
+ ret = split_rootfs_data(master, part, j);
+ if (ret == 0)
+ j++;
+#endif
}
}
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