diff options
Diffstat (limited to 'target/linux/generic-2.6/patches-2.6.25/065-rootfs_split.patch')
| -rw-r--r-- | target/linux/generic-2.6/patches-2.6.25/065-rootfs_split.patch | 965 |
1 files changed, 965 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.25/065-rootfs_split.patch b/target/linux/generic-2.6/patches-2.6.25/065-rootfs_split.patch new file mode 100644 index 0000000000..6b34a7a704 --- /dev/null +++ b/target/linux/generic-2.6/patches-2.6.25/065-rootfs_split.patch @@ -0,0 +1,965 @@ +Index: linux-2.6.23-rc6/drivers/mtd/Kconfig +=================================================================== +--- linux-2.6.23-rc6.orig/drivers/mtd/Kconfig 2007-09-21 16:23:54.000000000 +0800 ++++ linux-2.6.23-rc6/drivers/mtd/Kconfig 2007-09-21 16:23:59.000000000 +0800 +@@ -47,6 +47,16 @@ + 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-2.6.23-rc6/drivers/mtd/mtdpart.c +=================================================================== +--- linux-2.6.23-rc6.orig/drivers/mtd/mtdpart.c 2007-09-21 16:23:54.000000000 +0800 ++++ linux-2.6.23-rc6/drivers/mtd/mtdpart.c 2007-09-21 16:23:59.000000000 +0800 +@@ -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); +@@ -39,7 +41,7 @@ + * the pointer to that structure with this macro. + */ + #define PART(x) ((struct mtd_part *)(x)) +- ++#define IS_PART(mtd) (mtd->read == part_read) + + /* + * MTD methods which simply translate the effective address and pass through +@@ -322,6 +324,316 @@ + 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.owner = master->owner; ++ ++ slave->mtd.read = part_read; ++ slave->mtd.write = part_write; ++ ++ if (master->panic_write) ++ slave->mtd.panic_write = part_panic_write; ++ ++ slave->mtd.refresh_device = part->refresh_partition; ++ ++ 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" ++#define ROOTFS_REMOVED_NAME "<removed>" ++static int split_squashfs(struct mtd_info *master, int offset, int *split_offset) ++{ ++ char buf[512]; ++ struct squashfs_super_block *sb = (struct squashfs_super_block *) buf; ++ int len, ret; ++ ++ ret = master->read(master, offset, sizeof(*sb), &len, buf); ++ if (ret || (len != sizeof(*sb))) { ++ printk(KERN_ALERT "split_squashfs: error occured while reading " ++ "from \"%s\"\n", master->name); ++ return -EINVAL; ++ } ++ ++ if (*((u32 *) buf) != SQUASHFS_MAGIC) { ++ printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n", ++ master->name); ++ *split_offset = 0; ++ return 0; ++ } ++ ++ if (sb->bytes_used <= 0) { ++ printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n", ++ master->name); ++ *split_offset = 0; ++ return 0; ++ } ++ ++ len = (u32) sb->bytes_used; ++ len += (offset & 0x000fffff); ++ len += (master->erasesize - 1); ++ len &= ~(master->erasesize - 1); ++ len -= (offset & 0x000fffff); ++ *split_offset = offset + len; ++ ++ return 0; ++} ++ ++static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, struct mtd_partition *part, ++ int index) ++{ ++ struct mtd_partition *dpart; ++ struct mtd_part *slave = NULL; ++ int split_offset = 0; ++ int ret; ++ ++ ret = split_squashfs(master, part->offset, &split_offset); ++ if (ret) ++ return ret; ++ ++ if (split_offset <= 0) ++ return 0; ++ ++ dpart = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL); ++ if (dpart == NULL) { ++ printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n", ++ ROOTFS_SPLIT_NAME); ++ return -ENOMEM; ++ } ++ ++ memcpy(dpart, part, sizeof(*part)); ++ dpart->name = (unsigned char *)&dpart[1]; ++ strcpy(dpart->name, ROOTFS_SPLIT_NAME); ++ ++ dpart->size -= split_offset - dpart->offset; ++ dpart->offset = split_offset; ++ ++ 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, &slave); ++ if (ret) ++ kfree(dpart); ++ else if (slave) ++ rpart->split = &slave->mtd; ++ ++ return ret; ++} ++ ++static int refresh_rootfs_split(struct mtd_info *mtd) ++{ ++ struct mtd_partition tpart; ++ struct mtd_part *part; ++ int index = 0; ++ int offset, size; ++ int ret; ++ ++ part = PART(mtd); ++ ++ /* check for the new squashfs offset first */ ++ ret = split_squashfs(part->master, part->offset, &offset); ++ if (ret) ++ return ret; ++ ++ if ((offset > 0) && !mtd->split) { ++ printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name); ++ /* if we don't have a rootfs split partition, create a new one */ ++ tpart.name = mtd->name; ++ tpart.size = mtd->size; ++ tpart.offset = part->offset; ++ ++ /* find the index of the last partition */ ++ if (!list_empty(&mtd_partitions)) ++ index = list_first_entry(&mtd_partitions, struct mtd_part, list)->index + 1; ++ ++ return split_rootfs_data(part->master, &part->mtd, &tpart, index); ++ } else if ((offset > 0) && mtd->split) { ++ /* update the offsets of the existing partition */ ++ size = mtd->size + part->offset - offset; ++ ++ part = PART(mtd->split); ++ part->offset = offset; ++ part->mtd.size = size; ++ printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n", ++ __func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"), ++ part->offset, part->mtd.size); ++ strcpy(part->mtd.name, ROOTFS_SPLIT_NAME); ++ } else if ((offset <= 0) && mtd->split) { ++ printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name); ++ ++ /* mark existing partition as removed */ ++ part = PART(mtd->split); ++ strcpy(part->mtd.name, ROOTFS_REMOVED_NAME); ++ part->offset = 0; ++ part->mtd.size = 0; ++ } ++ ++ return 0; ++} ++#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 +@@ -334,171 +646,31 @@ + 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.owner = master->owner; +- +- slave->mtd.read = part_read; +- slave->mtd.write = part_write; +- +- if (master->panic_write) +- slave->mtd.panic_write = part_panic_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; +- } ++ 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); + } +- } 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; +- } +- } +- +- 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, &slave->mtd, part, j); ++ if (ret == 0) ++ j++; ++#endif + } + } + +@@ -574,6 +746,32 @@ + return ret; + } + ++int refresh_mtd_partitions(struct mtd_info *mtd) ++{ ++ int ret = 0; ++ ++ if (IS_PART(mtd)) { ++ struct mtd_part *part; ++ struct mtd_info *master; ++ ++ part = PART(mtd); ++ master = part->master; ++ if (master->refresh_device) ++ ret = master->refresh_device(master); ++ } ++ ++ if (!ret && mtd->refresh_device) ++ ret = mtd->refresh_device(mtd); ++ ++#ifdef CONFIG_MTD_ROOTFS_SPLIT ++ if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs")) ++ refresh_rootfs_split(mtd); ++#endif ++ ++ return 0; ++} ++ + EXPORT_SYMBOL_GPL(parse_mtd_partitions); ++EXPORT_SYMBOL_GPL(refresh_mtd_partitions); + EXPORT_SYMBOL_GPL(register_mtd_parser); + EXPORT_SYMBOL_GPL(deregister_mtd_parser); +Index: linux-2.6.23-rc6/drivers/mtd/devices/block2mtd.c +=================================================================== +--- linux-2.6.23-rc6.orig/drivers/mtd/devices/block2mtd.c 2007-09-21 16:23:59.000000000 +0800 ++++ linux-2.6.23-rc6/drivers/mtd/devices/block2mtd.c 2007-09-21 16:23:59.000000000 +0800 +@@ -34,6 +34,8 @@ + struct block_device *blkdev; + struct mtd_info mtd; + struct mutex write_mutex; ++ rwlock_t bdev_mutex; ++ char devname[0]; + }; + + +@@ -86,6 +88,12 @@ + size_t len = instr->len; + int err; + ++ read_lock(&dev->bdev_mutex); ++ if (!dev->blkdev) { ++ err = -EINVAL; ++ goto done; ++ } ++ + instr->state = MTD_ERASING; + mutex_lock(&dev->write_mutex); + err = _block2mtd_erase(dev, from, len); +@@ -98,6 +106,10 @@ + + instr->state = MTD_ERASE_DONE; + mtd_erase_callback(instr); ++ ++done: ++ read_unlock(&dev->bdev_mutex); ++ + return err; + } + +@@ -109,10 +121,14 @@ + struct page *page; + int index = from >> PAGE_SHIFT; + int offset = from & (PAGE_SIZE-1); +- int cpylen; ++ int cpylen, err = 0; ++ ++ read_lock(&dev->bdev_mutex); ++ if (!dev->blkdev || (from > mtd->size)) { ++ err = -EINVAL; ++ goto done; ++ } + +- if (from > mtd->size) +- return -EINVAL; + if (from + len > mtd->size) + len = mtd->size - from; + +@@ -127,10 +143,14 @@ + len = len - cpylen; + + page = page_read(dev->blkdev->bd_inode->i_mapping, index); +- if (!page) +- return -ENOMEM; +- if (IS_ERR(page)) +- return PTR_ERR(page); ++ if (!page) { ++ err = -ENOMEM; ++ goto done; ++ } ++ if (IS_ERR(page)) { ++ err = PTR_ERR(page); ++ goto done; ++ } + + memcpy(buf, page_address(page) + offset, cpylen); + page_cache_release(page); +@@ -141,7 +161,10 @@ + offset = 0; + index++; + } +- return 0; ++ ++done: ++ read_unlock(&dev->bdev_mutex); ++ return err; + } + + +@@ -193,12 +216,22 @@ + size_t *retlen, const u_char *buf) + { + struct block2mtd_dev *dev = mtd->priv; +- int err; ++ int err = 0; ++ ++ read_lock(&dev->bdev_mutex); ++ if (!dev->blkdev) { ++ err = -EINVAL; ++ goto done; ++ } + + if (!len) +- return 0; +- if (to >= mtd->size) +- return -ENOSPC; ++ goto done; ++ ++ if (to >= mtd->size) { ++ err = -ENOSPC; ++ goto done; ++ } ++ + if (to + len > mtd->size) + len = mtd->size - to; + +@@ -207,6 +240,9 @@ + mutex_unlock(&dev->write_mutex); + if (err > 0) + err = 0; ++ ++done: ++ read_unlock(&dev->bdev_mutex); + return err; + } + +@@ -215,51 +251,29 @@ + static void block2mtd_sync(struct mtd_info *mtd) + { + struct block2mtd_dev *dev = mtd->priv; +- sync_blockdev(dev->blkdev); +- return; +-} +- +- +-static void block2mtd_free_device(struct block2mtd_dev *dev) +-{ +- if (!dev) +- return; +- +- kfree(dev->mtd.name); + +- if (dev->blkdev) { +- invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping, +- 0, -1); +- close_bdev_excl(dev->blkdev); +- } ++ read_lock(&dev->bdev_mutex); ++ if (dev->blkdev) ++ sync_blockdev(dev->blkdev); ++ read_unlock(&dev->bdev_mutex); + +- kfree(dev); ++ return; + } + + +-/* FIXME: ensure that mtd->size % erase_size == 0 */ +-static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname) ++static int _open_bdev(struct block2mtd_dev *dev) + { + struct block_device *bdev; +- struct block2mtd_dev *dev; +- struct mtd_partition *part; +- +- if (!devname) +- return NULL; +- +- dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL); +- if (!dev) +- return NULL; + + /* Get a handle on the device */ +- bdev = open_bdev_excl(devname, O_RDWR, NULL); ++ bdev = open_bdev_excl(dev->devname, O_RDWR, NULL); + #ifndef MODULE + if (IS_ERR(bdev)) { + + /* We might not have rootfs mounted at this point. Try + to resolve the device name by other means. */ + +- dev_t devt = name_to_dev_t(devname); ++ dev_t devt = name_to_dev_t(dev->devname); + if (devt) { + bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ); + } +@@ -267,17 +281,96 @@ + #endif + + if (IS_ERR(bdev)) { +- ERROR("error: cannot open device %s", devname); +- goto devinit_err; ++ ERROR("error: cannot open device %s", dev->devname); ++ return 1; + } + dev->blkdev = bdev; + + if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) { + ERROR("attempting to use an MTD device as a block device"); +- goto devinit_err; ++ return 1; + } + ++ return 0; ++} ++ ++static void _close_bdev(struct block2mtd_dev *dev) ++{ ++ struct block_device *bdev; ++ ++ if (!dev->blkdev) ++ return; ++ ++ bdev = dev->blkdev; ++ invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping, 0, -1); ++ close_bdev_excl(dev->blkdev); ++ dev->blkdev = NULL; ++} ++ ++static void block2mtd_free_device(struct block2mtd_dev *dev) ++{ ++ if (!dev) ++ return; ++ ++ kfree(dev->mtd.name); ++ _close_bdev(dev); ++ kfree(dev); ++} ++ ++ ++static int block2mtd_refresh(struct mtd_info *mtd) ++{ ++ struct block2mtd_dev *dev = mtd->priv; ++ struct block_device *bdev; ++ dev_t devt; ++ int err = 0; ++ ++ /* no other mtd function can run at this point */ ++ write_lock(&dev->bdev_mutex); ++ ++ /* get the device number for the whole disk */ ++ devt = MKDEV(MAJOR(dev->blkdev->bd_dev), 0); ++ ++ /* close the old block device */ ++ _close_bdev(dev); ++ ++ /* open the whole disk, issue a partition rescan, then */ ++ bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ); ++ if (!bdev || !bdev->bd_disk) ++ err = -EINVAL; ++ else { ++ err = rescan_partitions(bdev->bd_disk, bdev); ++ } ++ if (bdev) ++ close_bdev_excl(bdev); ++ ++ /* try to open the partition block device again */ ++ _open_bdev(dev); ++ write_unlock(&dev->bdev_mutex); ++ ++ return err; ++} ++ ++/* FIXME: ensure that mtd->size % erase_size == 0 */ ++static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname) ++{ ++ struct block2mtd_dev *dev; ++ struct mtd_partition *part; ++ ++ if (!devname) ++ return NULL; ++ ++ dev = kzalloc(sizeof(struct block2mtd_dev) + strlen(devname) + 1, GFP_KERNEL); ++ if (!dev) ++ return NULL; ++ ++ strcpy(dev->devname, devname); ++ ++ if (_open_bdev(dev)) ++ goto devinit_err; ++ + mutex_init(&dev->write_mutex); ++ rwlock_init(&dev->bdev_mutex); + + /* Setup the MTD structure */ + /* make the name contain the block device in */ +@@ -304,6 +397,7 @@ + dev->mtd.read = block2mtd_read; + dev->mtd.priv = dev; + dev->mtd.owner = THIS_MODULE; ++ dev->mtd.refresh_device = block2mtd_refresh; + + part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL); + part->name = dev->mtd.name; +Index: linux-2.6.23-rc6/drivers/mtd/mtdchar.c +=================================================================== +--- linux-2.6.23-rc6.orig/drivers/mtd/mtdchar.c 2007-09-21 16:23:54.000000000 +0800 ++++ linux-2.6.23-rc6/drivers/mtd/mtdchar.c 2007-09-21 16:23:59.000000000 +0800 +@@ -17,6 +17,7 @@ + + #include <linux/mtd/mtd.h> + #include <linux/mtd/compatmac.h> ++#include <linux/mtd/partitions.h> + + #include <asm/uaccess.h> + +@@ -753,6 +754,13 @@ + file->f_pos = 0; + break; + } ++#ifdef CONFIG_MTD_PARTITIONS ++ case MTDREFRESH: ++ { ++ ret = refresh_mtd_partitions(mtd); ++ break; ++ } ++#endif + + default: + ret = -ENOTTY; +Index: linux-2.6.23-rc6/include/linux/mtd/mtd.h +=================================================================== +--- linux-2.6.23-rc6.orig/include/linux/mtd/mtd.h 2007-09-21 16:23:54.000000000 +0800 ++++ linux-2.6.23-rc6/include/linux/mtd/mtd.h 2007-09-21 16:23:59.000000000 +0800 +@@ -98,6 +98,7 @@ + uint8_t *oobbuf; + }; + ++struct mtd_info; + struct mtd_info { + u_char type; + u_int32_t flags; +@@ -195,6 +196,9 @@ + struct module *owner; + int usecount; + ++ int (*refresh_device)(struct mtd_info *mtd); ++ struct mtd_info *split; ++ + /* If the driver is something smart, like UBI, it may need to maintain + * its own reference counting. The below functions are only for driver. + * The driver may register its callbacks. These callbacks are not +Index: linux-2.6.23-rc6/include/linux/mtd/partitions.h +=================================================================== +--- linux-2.6.23-rc6.orig/include/linux/mtd/partitions.h 2007-09-21 16:23:54.000000000 +0800 ++++ linux-2.6.23-rc6/include/linux/mtd/partitions.h 2007-09-21 16:23:59.000000000 +0800 +@@ -36,6 +36,7 @@ + * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK). + */ + ++struct mtd_partition; + struct mtd_partition { + char *name; /* identifier string */ + u_int32_t size; /* partition size */ +@@ -43,6 +44,7 @@ + u_int32_t mask_flags; /* master MTD flags to mask out for this partition */ + struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only)*/ + struct mtd_info **mtdp; /* pointer to store the MTD object */ ++ int (*refresh_partition)(struct mtd_info *); + }; + + #define MTDPART_OFS_NXTBLK (-2) +@@ -52,6 +54,7 @@ + + int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int); + int del_mtd_partitions(struct mtd_info *); ++int refresh_mtd_partitions(struct mtd_info *); + + /* + * Functions dealing with the various ways of partitioning the space +Index: linux-2.6.23-rc6/include/mtd/mtd-abi.h +=================================================================== +--- linux-2.6.23-rc6.orig/include/mtd/mtd-abi.h 2007-09-21 16:23:54.000000000 +0800 ++++ linux-2.6.23-rc6/include/mtd/mtd-abi.h 2007-09-21 16:23:59.000000000 +0800 +@@ -95,6 +95,7 @@ + #define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout) + #define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats) + #define MTDFILEMODE _IO('M', 19) ++#define MTDREFRESH _IO('M', 23) + + /* + * Obsolete legacy interface. Keep it in order not to break userspace |