diff options
Diffstat (limited to 'target/linux/generic/patches-2.6.39/065-rootfs_split.patch')
| -rw-r--r-- | target/linux/generic/patches-2.6.39/065-rootfs_split.patch | 619 |
1 files changed, 619 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.39/065-rootfs_split.patch b/target/linux/generic/patches-2.6.39/065-rootfs_split.patch new file mode 100644 index 0000000000..081a1b4f01 --- /dev/null +++ b/target/linux/generic/patches-2.6.39/065-rootfs_split.patch @@ -0,0 +1,619 @@ +--- a/drivers/mtd/Kconfig ++++ b/drivers/mtd/Kconfig +@@ -47,6 +47,16 @@ config MTD_PARTITIONS + + if MTD_PARTITIONS + ++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" + ---help--- +--- a/drivers/mtd/mtdpart.c ++++ b/drivers/mtd/mtdpart.c +@@ -29,6 +29,8 @@ + #include <linux/kmod.h> + #include <linux/mtd/mtd.h> + #include <linux/mtd/partitions.h> ++#include <linux/root_dev.h> ++#include <linux/magic.h> + #include <linux/err.h> + + /* Our partition linked list */ +@@ -48,7 +50,7 @@ struct mtd_part { + * 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 +@@ -636,6 +638,153 @@ int mtd_del_partition(struct mtd_info *m + } + EXPORT_SYMBOL_GPL(mtd_del_partition); + ++#ifdef CONFIG_MTD_ROOTFS_SPLIT ++#define ROOTFS_SPLIT_NAME "rootfs_data" ++#define ROOTFS_REMOVED_NAME "<removed>" ++ ++struct squashfs_super_block { ++ __le32 s_magic; ++ __le32 pad0[9]; ++ __le64 bytes_used; ++}; ++ ++ ++static int split_squashfs(struct mtd_info *master, int offset, int *split_offset) ++{ ++ struct squashfs_super_block sb; ++ int len, ret; ++ ++ ret = master->read(master, offset, sizeof(sb), &len, (void *) &sb); ++ if (ret || (len != sizeof(sb))) { ++ printk(KERN_ALERT "split_squashfs: error occured while reading " ++ "from \"%s\"\n", master->name); ++ return -EINVAL; ++ } ++ ++ if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) ) { ++ printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n", ++ master->name); ++ *split_offset = 0; ++ return 0; ++ } ++ ++ if (le64_to_cpu((sb.bytes_used)) <= 0) { ++ printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n", ++ master->name); ++ *split_offset = 0; ++ return 0; ++ } ++ ++ len = (u32) le64_to_cpu(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, const struct mtd_partition *part) ++{ ++ struct mtd_partition *dpart; ++ struct mtd_part *slave = NULL; ++ int ret, split_offset = 0; ++ ++ 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=%llX, len=%llX \n", ++ ROOTFS_SPLIT_NAME, dpart->offset, dpart->size); ++ ++ slave = allocate_partition(master, dpart, 0, split_offset); ++ if (IS_ERR(slave)) ++ return PTR_ERR(slave); ++ mutex_lock(&mtd_partitions_mutex); ++ list_add(&slave->list, &mtd_partitions); ++ mutex_unlock(&mtd_partitions_mutex); ++ ++ add_mtd_device(&slave->mtd); ++ ++ rpart->split = &slave->mtd; ++ ++ return 0; ++} ++ ++static int refresh_rootfs_split(struct mtd_info *mtd) ++{ ++ struct mtd_partition tpart; ++ struct mtd_part *part; ++ char *name; ++ //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 = (char *) mtd->name; ++ tpart.size = mtd->size; ++ tpart.offset = part->offset; ++ ++ return split_rootfs_data(part->master, &part->mtd, &tpart); ++ } 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"), ++ (u32) part->offset, (u32) part->mtd.size); ++ name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL); ++ strcpy(name, ROOTFS_SPLIT_NAME); ++ part->mtd.name = 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); ++ name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL); ++ strcpy(name, ROOTFS_REMOVED_NAME); ++ part->mtd.name = 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 +@@ -652,6 +801,9 @@ int add_mtd_partitions(struct mtd_info * + struct mtd_part *slave; + uint64_t cur_offset = 0; + int i; ++#ifdef CONFIG_MTD_ROOTFS_SPLIT ++ int ret; ++#endif + + printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); + +@@ -666,6 +818,21 @@ int add_mtd_partitions(struct mtd_info * + + add_mtd_device(&slave->mtd); + ++ if (!strcmp(parts[i].name, "rootfs")) { ++#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); ++ } ++#endif ++#ifdef CONFIG_MTD_ROOTFS_SPLIT ++ ret = split_rootfs_data(master, &slave->mtd, &parts[i]); ++ /* if (ret == 0) ++ * j++; */ ++#endif ++ } ++ + cur_offset = slave->offset + slave->mtd.size; + } + +@@ -673,6 +840,32 @@ int add_mtd_partitions(struct mtd_info * + } + EXPORT_SYMBOL(add_mtd_partitions); + ++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(refresh_mtd_partitions); ++ + static DEFINE_SPINLOCK(part_parser_lock); + static LIST_HEAD(part_parsers); + +--- a/drivers/mtd/devices/block2mtd.c ++++ b/drivers/mtd/devices/block2mtd.c +@@ -30,6 +30,8 @@ struct block2mtd_dev { + struct block_device *blkdev; + struct mtd_info mtd; + struct mutex write_mutex; ++ rwlock_t bdev_mutex; ++ char devname[0]; + }; + + +@@ -82,6 +84,12 @@ static int block2mtd_erase(struct mtd_in + 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); +@@ -93,6 +101,10 @@ static int block2mtd_erase(struct mtd_in + instr->state = MTD_ERASE_DONE; + + mtd_erase_callback(instr); ++ ++done: ++ read_unlock(&dev->bdev_mutex); ++ + return err; + } + +@@ -104,10 +116,14 @@ static int block2mtd_read(struct mtd_inf + 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; + +@@ -122,10 +138,14 @@ static int block2mtd_read(struct mtd_inf + 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); +@@ -136,7 +156,10 @@ static int block2mtd_read(struct mtd_inf + offset = 0; + index++; + } +- return 0; ++ ++done: ++ read_unlock(&dev->bdev_mutex); ++ return err; + } + + +@@ -188,12 +211,22 @@ static int block2mtd_write(struct mtd_in + 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; + +@@ -202,6 +235,9 @@ static int block2mtd_write(struct mtd_in + mutex_unlock(&dev->write_mutex); + if (err > 0) + err = 0; ++ ++done: ++ read_unlock(&dev->bdev_mutex); + return err; + } + +@@ -210,33 +246,109 @@ static int block2mtd_write(struct mtd_in + static void block2mtd_sync(struct mtd_info *mtd) + { + struct block2mtd_dev *dev = mtd->priv; ++ read_lock(&dev->bdev_mutex); ++ if (dev->blkdev) + sync_blockdev(dev->blkdev); ++ read_unlock(&dev->bdev_mutex); ++ + return; + } + + ++static int _open_bdev(struct block2mtd_dev *dev) ++{ ++ const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL; ++ struct block_device *bdev; ++ ++ /* Get a handle on the device */ ++ bdev = blkdev_get_by_path(dev->devname, mode, dev); ++#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(dev->devname); ++ if (devt) ++ bdev = blkdev_get_by_dev(devt, mode, dev); ++ } ++#endif ++ ++ if (IS_ERR(bdev)) { ++ 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"); ++ 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); ++ blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); ++ dev->blkdev = NULL; ++} ++ + 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); +- blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); +- } +- ++ _close_bdev(dev); + kfree(dev); + } + + +-/* FIXME: ensure that mtd->size % erase_size == 0 */ +-static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname) ++static int block2mtd_refresh(struct mtd_info *mtd) + { +- const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL; ++ 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 = blkdev_get_by_dev(devt, FMODE_WRITE | FMODE_READ); ++ if (!bdev || !bdev->bd_disk) ++ err = -EINVAL; ++#ifndef CONFIG_MTD_BLOCK2MTD_MODULE ++ else ++ err = rescan_partitions(bdev->bd_disk, bdev); ++#endif ++ if (bdev) ++ blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); ++ ++ /* 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; + char *name; +@@ -244,36 +356,17 @@ static struct block2mtd_dev *add_device( + if (!devname) + return NULL; + +- dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL); ++ dev = kzalloc(sizeof(struct block2mtd_dev) + strlen(devname) + 1, GFP_KERNEL); + if (!dev) + return NULL; + +- /* Get a handle on the device */ +- bdev = blkdev_get_by_path(devname, mode, dev); +-#ifndef MODULE +- if (IS_ERR(bdev)) { +- +- /* We might not have rootfs mounted at this point. Try +- to resolve the device name by other means. */ ++ strcpy(dev->devname, devname); + +- dev_t devt = name_to_dev_t(devname); +- if (devt) +- bdev = blkdev_get_by_dev(devt, mode, dev); +- } +-#endif +- +- if (IS_ERR(bdev)) { +- ERROR("error: cannot open device %s", devname); ++ if (_open_bdev(dev)) + goto devinit_err; +- } +- 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; +- } + + mutex_init(&dev->write_mutex); ++ rwlock_init(&dev->bdev_mutex); + + /* Setup the MTD structure */ + /* make the name contain the block device in */ +@@ -298,6 +391,7 @@ static struct block2mtd_dev *add_device( + 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; +--- a/drivers/mtd/mtdchar.c ++++ b/drivers/mtd/mtdchar.c +@@ -841,6 +841,13 @@ static int mtd_ioctl(struct file *file, + file->f_pos = 0; + break; + } ++#ifdef CONFIG_MTD_PARTITIONS ++ case MTDREFRESH: ++ { ++ ret = refresh_mtd_partitions(mtd); ++ break; ++ } ++#endif + + case OTPGETREGIONCOUNT: + case OTPGETREGIONINFO: +--- a/include/linux/mtd/mtd.h ++++ b/include/linux/mtd/mtd.h +@@ -125,6 +125,7 @@ struct nand_ecclayout { + struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE]; + }; + ++struct mtd_info; + struct mtd_info { + u_char type; + uint32_t flags; +@@ -277,6 +278,9 @@ struct mtd_info { + struct device dev; + 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 +--- a/include/linux/mtd/partitions.h ++++ b/include/linux/mtd/partitions.h +@@ -34,12 +34,14 @@ + * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK). + */ + ++struct mtd_partition; + struct mtd_partition { + char *name; /* identifier string */ + uint64_t size; /* partition size */ + uint64_t offset; /* offset within the master MTD space */ + uint32_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) */ ++ int (*refresh_partition)(struct mtd_info *); + }; + + #define MTDPART_OFS_NXTBLK (-2) +@@ -51,6 +53,7 @@ struct mtd_info; + + 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 +--- a/include/mtd/mtd-abi.h ++++ b/include/mtd/mtd-abi.h +@@ -127,6 +127,7 @@ struct otp_info { + #define MEMWRITEOOB64 _IOWR('M', 21, struct mtd_oob_buf64) + #define MEMREADOOB64 _IOWR('M', 22, struct mtd_oob_buf64) + #define MEMISLOCKED _IOR('M', 23, struct erase_info_user) ++#define MTDREFRESH _IO('M', 23) + + /* + * Obsolete legacy interface. Keep it in order not to break userspace |