diff options
Diffstat (limited to 'target/linux/generic/patches-3.10/400-mtd-add-rootfs-split-support.patch')
| -rw-r--r-- | target/linux/generic/patches-3.10/400-mtd-add-rootfs-split-support.patch | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.10/400-mtd-add-rootfs-split-support.patch b/target/linux/generic/patches-3.10/400-mtd-add-rootfs-split-support.patch new file mode 100644 index 0000000000..4cacf641d8 --- /dev/null +++ b/target/linux/generic/patches-3.10/400-mtd-add-rootfs-split-support.patch @@ -0,0 +1,282 @@ +--- a/drivers/mtd/Kconfig ++++ b/drivers/mtd/Kconfig +@@ -23,6 +23,23 @@ config MTD_TESTS + WARNING: some of the tests will ERASE entire MTD device which they + test. Do not use these tests unless you really know what you do. + ++config MTD_ROOTFS_ROOT_DEV ++ bool "Automatically set 'rootfs' partition to be root filesystem" ++ default y ++ ++config MTD_ROOTFS_SPLIT ++ bool "Automatically split 'rootfs' partition for squashfs" ++ default y ++ ++config MTD_UIMAGE_SPLIT ++ bool "Automatically split off rootfs from a kernel partition containing a uImage" ++ default y ++ ++config MTD_UIMAGE_SPLIT_NAME ++ string "uImage partition name" ++ depends on MTD_UIMAGE_SPLIT ++ default "firmware" ++ + 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> + + #include "mtdcore.h" +@@ -45,12 +47,14 @@ struct mtd_part { + struct list_head list; + }; + ++static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part); ++ + /* + * Given a pointer to the MTD object in the mtd_part structure, we can retrieve + * 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 +@@ -533,8 +537,10 @@ out_register: + return slave; + } + +-int mtd_add_partition(struct mtd_info *master, char *name, +- long long offset, long long length) ++ ++static int ++__mtd_add_partition(struct mtd_info *master, char *name, ++ long long offset, long long length, bool dup_check) + { + struct mtd_partition part; + struct mtd_part *p, *new; +@@ -566,21 +572,24 @@ int mtd_add_partition(struct mtd_info *m + end = offset + length; + + mutex_lock(&mtd_partitions_mutex); +- list_for_each_entry(p, &mtd_partitions, list) +- if (p->master == master) { +- if ((start >= p->offset) && +- (start < (p->offset + p->mtd.size))) +- goto err_inv; +- +- if ((end >= p->offset) && +- (end < (p->offset + p->mtd.size))) +- goto err_inv; +- } ++ if (dup_check) { ++ list_for_each_entry(p, &mtd_partitions, list) ++ if (p->master == master) { ++ if ((start >= p->offset) && ++ (start < (p->offset + p->mtd.size))) ++ goto err_inv; ++ ++ if ((end >= p->offset) && ++ (end < (p->offset + p->mtd.size))) ++ goto err_inv; ++ } ++ } + + list_add(&new->list, &mtd_partitions); + mutex_unlock(&mtd_partitions_mutex); + + add_mtd_device(&new->mtd); ++ mtd_partition_split(master, new); + + return ret; + err_inv: +@@ -590,6 +599,12 @@ err_inv: + } + EXPORT_SYMBOL_GPL(mtd_add_partition); + ++int mtd_add_partition(struct mtd_info *master, char *name, ++ long long offset, long long length) ++{ ++ return __mtd_add_partition(master, name, offset, length, true); ++} ++ + int mtd_del_partition(struct mtd_info *master, int partno) + { + struct mtd_part *slave, *next; +@@ -613,6 +628,149 @@ int mtd_del_partition(struct mtd_info *m + } + EXPORT_SYMBOL_GPL(mtd_del_partition); + ++static inline unsigned long ++mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len) ++{ ++ unsigned long mask = mtd->erasesize - 1; ++ ++ len += offset & mask; ++ len = (len + mask) & ~mask; ++ len -= offset & mask; ++ return len; ++} ++ ++#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 = mtd_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 = mtd_pad_erasesize(master, offset, len); ++ *split_offset = offset + len; ++ ++ return 0; ++} ++ ++static void split_rootfs_data(struct mtd_info *master, struct mtd_part *part) ++{ ++ unsigned int split_offset = 0; ++ unsigned int split_size; ++ int ret; ++ ++ ret = split_squashfs(master, part->offset, &split_offset); ++ if (ret) ++ return; ++ ++ if (split_offset <= 0) ++ return; ++ ++ split_size = part->mtd.size - (split_offset - part->offset); ++ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=0x%x, len=0x%x\n", ++ ROOTFS_SPLIT_NAME, split_offset, split_size); ++ ++ __mtd_add_partition(master, ROOTFS_SPLIT_NAME, split_offset, ++ split_size, false); ++} ++#endif /* CONFIG_MTD_ROOTFS_SPLIT */ ++ ++#ifdef CONFIG_MTD_UIMAGE_SPLIT ++#define UBOOT_MAGIC 0x27051956 ++ ++static void split_uimage(struct mtd_info *master, struct mtd_part *part) ++{ ++ struct { ++ __be32 magic; ++ __be32 pad[2]; ++ __be32 size; ++ } hdr; ++ size_t len; ++ ++ if (strcmp(part->mtd.name, CONFIG_MTD_UIMAGE_SPLIT_NAME) != 0) ++ return; ++ ++ if (mtd_read(master, part->offset, sizeof(hdr), &len, (void *) &hdr)) ++ return; ++ ++ if (len != sizeof(hdr) || hdr.magic != cpu_to_be32(UBOOT_MAGIC)) ++ return; ++ ++ len = be32_to_cpu(hdr.size) + 0x40; ++ len = mtd_pad_erasesize(master, part->offset, len); ++ if (len + master->erasesize > part->mtd.size) ++ return; ++ ++ __mtd_add_partition(master, "rootfs", part->offset + len, ++ part->mtd.size - len, false); ++} ++#endif ++ ++void __weak arch_split_mtd_part(struct mtd_info *master, const char *name, ++ int offset, int size) ++{ ++} ++ ++ ++static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part) ++{ ++ static int rootfs_found = 0; ++ ++ if (rootfs_found) ++ return; ++ ++ if (!strcmp(part->mtd.name, "rootfs")) { ++ rootfs_found = 1; ++ ++#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, part->mtd.index); ++ } ++#endif ++#ifdef CONFIG_MTD_ROOTFS_SPLIT ++ split_rootfs_data(master, part); ++#endif ++ } ++ ++#ifdef CONFIG_MTD_UIMAGE_SPLIT ++ split_uimage(master, part); ++#endif ++ ++ arch_split_mtd_part(master, part->mtd.name, part->offset, ++ part->mtd.size); ++} + /* + * 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 +@@ -642,6 +800,7 @@ int add_mtd_partitions(struct mtd_info * + mutex_unlock(&mtd_partitions_mutex); + + add_mtd_device(&slave->mtd); ++ mtd_partition_split(master, slave); + + cur_offset = slave->offset + slave->mtd.size; + } +--- a/include/linux/mtd/partitions.h ++++ b/include/linux/mtd/partitions.h +@@ -84,5 +84,7 @@ int mtd_add_partition(struct mtd_info *m + long long offset, long long length); + int mtd_del_partition(struct mtd_info *master, int partno); + uint64_t mtd_get_device_size(const struct mtd_info *mtd); ++extern void __weak arch_split_mtd_part(struct mtd_info *master, ++ const char *name, int offset, int size); + + #endif |