mirror of https://github.com/hak5/openwrt.git
945 lines
25 KiB
Diff
945 lines
25 KiB
Diff
--- a/drivers/mtd/Kconfig
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+++ b/drivers/mtd/Kconfig
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@@ -47,6 +47,16 @@
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devices. Partitioning on NFTL 'devices' is a different - that's the
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'normal' form of partitioning used on a block device.
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+config MTD_ROOTFS_ROOT_DEV
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+ bool "Automatically set 'rootfs' partition to be root filesystem"
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+ depends on MTD_PARTITIONS
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+ default y
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+
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+config MTD_ROOTFS_SPLIT
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+ bool "Automatically split 'rootfs' partition for squashfs"
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+ depends on MTD_PARTITIONS
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+ default y
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+
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config MTD_REDBOOT_PARTS
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tristate "RedBoot partition table parsing"
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depends on MTD_PARTITIONS
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -20,6 +20,8 @@
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/compatmac.h>
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+#include <linux/squashfs_fs.h>
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+#include <linux/root_dev.h>
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/* Our partition linked list */
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static LIST_HEAD(mtd_partitions);
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@@ -39,7 +41,7 @@
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* the pointer to that structure with this macro.
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*/
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#define PART(x) ((struct mtd_part *)(x))
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-
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+#define IS_PART(mtd) (mtd->read == part_read)
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/*
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* MTD methods which simply translate the effective address and pass through
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@@ -308,6 +310,312 @@
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return 0;
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}
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+static u_int32_t cur_offset = 0;
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+static int add_one_partition(struct mtd_info *master, const struct mtd_partition *part,
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+ int i, struct mtd_part **slp)
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+{
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+ struct mtd_part *slave;
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+
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+ /* allocate the partition structure */
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+ slave = kzalloc (sizeof(*slave), GFP_KERNEL);
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+ if (!slave) {
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+ printk ("memory allocation error while creating partitions for \"%s\"\n",
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+ master->name);
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+ del_mtd_partitions(master);
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+ return -ENOMEM;
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+ }
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+ list_add(&slave->list, &mtd_partitions);
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+
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+ /* set up the MTD object for this partition */
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+ slave->mtd.type = master->type;
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+ slave->mtd.flags = master->flags & ~part->mask_flags;
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+ slave->mtd.size = part->size;
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+ slave->mtd.writesize = master->writesize;
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+ slave->mtd.oobsize = master->oobsize;
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+ slave->mtd.oobavail = master->oobavail;
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+ slave->mtd.subpage_sft = master->subpage_sft;
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+
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+ slave->mtd.name = part->name;
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+ slave->mtd.owner = master->owner;
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+
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+ slave->mtd.read = part_read;
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+ slave->mtd.write = part_write;
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+ slave->mtd.refresh_device = part->refresh_partition;
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+
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+ if(master->point && master->unpoint){
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+ slave->mtd.point = part_point;
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+ slave->mtd.unpoint = part_unpoint;
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+ }
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+
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+ if (master->read_oob)
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+ slave->mtd.read_oob = part_read_oob;
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+ if (master->write_oob)
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+ slave->mtd.write_oob = part_write_oob;
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+ if(master->read_user_prot_reg)
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+ slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
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+ if(master->read_fact_prot_reg)
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+ slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
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+ if(master->write_user_prot_reg)
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+ slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
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+ if(master->lock_user_prot_reg)
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+ slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
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+ if(master->get_user_prot_info)
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+ slave->mtd.get_user_prot_info = part_get_user_prot_info;
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+ if(master->get_fact_prot_info)
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+ slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
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+ if (master->sync)
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+ slave->mtd.sync = part_sync;
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+ if (!i && master->suspend && master->resume) {
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+ slave->mtd.suspend = part_suspend;
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+ slave->mtd.resume = part_resume;
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+ }
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+ if (master->writev)
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+ slave->mtd.writev = part_writev;
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+ if (master->lock)
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+ slave->mtd.lock = part_lock;
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+ if (master->unlock)
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+ slave->mtd.unlock = part_unlock;
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+ if (master->block_isbad)
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+ slave->mtd.block_isbad = part_block_isbad;
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+ if (master->block_markbad)
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+ slave->mtd.block_markbad = part_block_markbad;
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+ slave->mtd.erase = part_erase;
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+ slave->master = master;
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+ slave->offset = part->offset;
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+ slave->index = i;
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+
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+ if (slave->offset == MTDPART_OFS_APPEND)
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+ slave->offset = cur_offset;
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+ if (slave->offset == MTDPART_OFS_NXTBLK) {
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+ slave->offset = cur_offset;
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+ if ((cur_offset % master->erasesize) != 0) {
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+ /* Round up to next erasesize */
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+ slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
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+ printk(KERN_NOTICE "Moving partition %d: "
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+ "0x%08x -> 0x%08x\n", i,
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+ cur_offset, slave->offset);
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+ }
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+ }
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+ if (slave->mtd.size == MTDPART_SIZ_FULL)
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+ slave->mtd.size = master->size - slave->offset;
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+ cur_offset = slave->offset + slave->mtd.size;
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+
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+ printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
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+ slave->offset + slave->mtd.size, slave->mtd.name);
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+
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+ /* let's do some sanity checks */
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+ if (slave->offset >= master->size) {
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+ /* let's register it anyway to preserve ordering */
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+ slave->offset = 0;
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+ slave->mtd.size = 0;
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+ printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
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+ part->name);
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+ }
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+ if (slave->offset + slave->mtd.size > master->size) {
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+ slave->mtd.size = master->size - slave->offset;
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+ printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
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+ part->name, master->name, slave->mtd.size);
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+ }
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+ if (master->numeraseregions>1) {
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+ /* Deal with variable erase size stuff */
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+ int i;
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+ struct mtd_erase_region_info *regions = master->eraseregions;
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+
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+ /* Find the first erase regions which is part of this partition. */
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+ for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
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+ ;
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+
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+ for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
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+ if (slave->mtd.erasesize < regions[i].erasesize) {
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+ slave->mtd.erasesize = regions[i].erasesize;
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+ }
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+ }
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+ } else {
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+ /* Single erase size */
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+ slave->mtd.erasesize = master->erasesize;
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+ }
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+
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+ if ((slave->mtd.flags & MTD_WRITEABLE) &&
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+ (slave->offset % slave->mtd.erasesize)) {
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+ /* Doesn't start on a boundary of major erase size */
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+ /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
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+ slave->mtd.flags &= ~MTD_WRITEABLE;
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+ printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
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+ part->name);
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+ }
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+ if ((slave->mtd.flags & MTD_WRITEABLE) &&
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+ (slave->mtd.size % slave->mtd.erasesize)) {
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+ slave->mtd.flags &= ~MTD_WRITEABLE;
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+ printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
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+ part->name);
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+ }
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+
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+ slave->mtd.ecclayout = master->ecclayout;
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+ if (master->block_isbad) {
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+ uint32_t offs = 0;
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+
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+ while(offs < slave->mtd.size) {
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+ if (master->block_isbad(master,
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+ offs + slave->offset))
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+ slave->mtd.ecc_stats.badblocks++;
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+ offs += slave->mtd.erasesize;
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+ }
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+ }
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+
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+ if(part->mtdp)
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+ { /* store the object pointer (caller may or may not register it */
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+ *part->mtdp = &slave->mtd;
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+ slave->registered = 0;
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+ }
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+ else
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+ {
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+ /* register our partition */
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+ add_mtd_device(&slave->mtd);
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+ slave->registered = 1;
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+ }
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+
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+ if (slp)
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+ *slp = slave;
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+
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+ return 0;
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+}
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+
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+#ifdef CONFIG_MTD_ROOTFS_SPLIT
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+#define ROOTFS_SPLIT_NAME "rootfs_data"
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+#define ROOTFS_REMOVED_NAME "<removed>"
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+static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
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+{
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+ char buf[512];
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+ struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
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+ int len, ret;
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+
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+ ret = master->read(master, offset, sizeof(*sb), &len, buf);
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+ if (ret || (len != sizeof(*sb))) {
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+ printk(KERN_ALERT "split_squashfs: error occured while reading "
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+ "from \"%s\"\n", master->name);
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+ return -EINVAL;
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+ }
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+
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+ if (*((u32 *) buf) != SQUASHFS_MAGIC) {
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+ printk(KERN_ALERT "split_squasfs: no squashfs found in \"%s\"\n",
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+ master->name);
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+ *split_offset = 0;
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+ return 0;
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+ }
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+
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+ if (sb->bytes_used <= 0) {
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+ printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
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+ master->name);
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+ *split_offset = 0;
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+ return 0;
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+ }
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+
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+ len = (u32) sb->bytes_used;
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+ len += (offset & 0x000fffff);
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+ len += (master->erasesize - 1);
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+ len &= ~(master->erasesize - 1);
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+ len -= (offset & 0x000fffff);
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+ *split_offset = offset + len;
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+
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+ return 0;
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+}
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+
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+static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, struct mtd_partition *part,
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+ int index)
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+{
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+ struct mtd_partition *dpart;
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+ struct mtd_part *slave = NULL;
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+ int split_offset = 0;
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+ int ret;
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+
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+ ret = split_squashfs(master, part->offset, &split_offset);
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+ if (ret)
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+ return ret;
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+
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+ if (split_offset <= 0)
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+ return 0;
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+
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+ dpart = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
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+ if (dpart == NULL) {
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+ printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
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+ ROOTFS_SPLIT_NAME);
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+ return -ENOMEM;
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+ }
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+
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+ memcpy(dpart, part, sizeof(*part));
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+ dpart->name = (unsigned char *)&dpart[1];
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+ strcpy(dpart->name, ROOTFS_SPLIT_NAME);
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+
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+ dpart->size -= split_offset - dpart->offset;
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+ dpart->offset = split_offset;
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+
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+ if (dpart == NULL)
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+ return 1;
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+
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+ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%X, len=%X \n",
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+ ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
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+
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+ ret = add_one_partition(master, dpart, index, &slave);
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+ if (ret)
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+ kfree(dpart);
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+ else if (slave)
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+ rpart->split = &slave->mtd;
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+
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+ return ret;
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+}
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+
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+static int refresh_rootfs_split(struct mtd_info *mtd)
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+{
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+ struct mtd_partition tpart;
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+ struct mtd_part *part;
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+ int index = 0;
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+ int offset, size;
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+ int ret;
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+
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+ part = PART(mtd);
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+
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+ /* check for the new squashfs offset first */
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+ ret = split_squashfs(part->master, part->offset, &offset);
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+ if (ret)
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+ return ret;
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+
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+ if ((offset > 0) && !mtd->split) {
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+ printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
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+ /* if we don't have a rootfs split partition, create a new one */
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+ tpart.name = mtd->name;
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+ tpart.size = mtd->size;
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+ tpart.offset = part->offset;
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+
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+ /* find the index of the last partition */
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+ if (!list_empty(&mtd_partitions))
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+ index = list_first_entry(&mtd_partitions, struct mtd_part, list)->index + 1;
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+
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+ return split_rootfs_data(part->master, &part->mtd, &tpart, index);
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+ } else if ((offset > 0) && mtd->split) {
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+ /* update the offsets of the existing partition */
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+ size = mtd->size + part->offset - offset;
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+
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+ part = PART(mtd->split);
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+ part->offset = offset;
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+ part->mtd.size = size;
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+ printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
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+ __func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
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+ part->offset, part->mtd.size);
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+ strcpy(part->mtd.name, ROOTFS_SPLIT_NAME);
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+ } else if ((offset <= 0) && mtd->split) {
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+ printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
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+
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+ /* mark existing partition as removed */
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+ part = PART(mtd->split);
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+ strcpy(part->mtd.name, ROOTFS_REMOVED_NAME);
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+ part->offset = 0;
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+ part->mtd.size = 0;
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+ }
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+
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+ return 0;
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+}
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+#endif /* CONFIG_MTD_ROOTFS_SPLIT */
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+
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/*
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* This function, given a master MTD object and a partition table, creates
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* and registers slave MTD objects which are bound to the master according to
|
|
@@ -320,168 +628,31 @@
|
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int nbparts)
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{
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struct mtd_part *slave;
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- u_int32_t cur_offset = 0;
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- int i;
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+ struct mtd_partition *part;
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+ int i, j, ret = 0;
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printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
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- for (i = 0; i < nbparts; i++) {
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-
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- /* allocate the partition structure */
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- slave = kzalloc (sizeof(*slave), GFP_KERNEL);
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- if (!slave) {
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- printk ("memory allocation error while creating partitions for \"%s\"\n",
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- master->name);
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- del_mtd_partitions(master);
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- return -ENOMEM;
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- }
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- list_add(&slave->list, &mtd_partitions);
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-
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- /* set up the MTD object for this partition */
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- slave->mtd.type = master->type;
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- slave->mtd.flags = master->flags & ~parts[i].mask_flags;
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- slave->mtd.size = parts[i].size;
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- slave->mtd.writesize = master->writesize;
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- slave->mtd.oobsize = master->oobsize;
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- slave->mtd.oobavail = master->oobavail;
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- slave->mtd.subpage_sft = master->subpage_sft;
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-
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- slave->mtd.name = parts[i].name;
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- slave->mtd.owner = master->owner;
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-
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- slave->mtd.read = part_read;
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- slave->mtd.write = part_write;
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-
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- if(master->point && master->unpoint){
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- slave->mtd.point = part_point;
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- slave->mtd.unpoint = part_unpoint;
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- }
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-
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- if (master->read_oob)
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- slave->mtd.read_oob = part_read_oob;
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- if (master->write_oob)
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- slave->mtd.write_oob = part_write_oob;
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- if(master->read_user_prot_reg)
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- slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
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- if(master->read_fact_prot_reg)
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- slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
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- if(master->write_user_prot_reg)
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- slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
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- if(master->lock_user_prot_reg)
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- slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
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- if(master->get_user_prot_info)
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- slave->mtd.get_user_prot_info = part_get_user_prot_info;
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- if(master->get_fact_prot_info)
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- slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
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- if (master->sync)
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- slave->mtd.sync = part_sync;
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- if (!i && master->suspend && master->resume) {
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- slave->mtd.suspend = part_suspend;
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- slave->mtd.resume = part_resume;
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- }
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- if (master->writev)
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- slave->mtd.writev = part_writev;
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- if (master->lock)
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- slave->mtd.lock = part_lock;
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- if (master->unlock)
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- slave->mtd.unlock = part_unlock;
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- if (master->block_isbad)
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- slave->mtd.block_isbad = part_block_isbad;
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- if (master->block_markbad)
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- slave->mtd.block_markbad = part_block_markbad;
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- slave->mtd.erase = part_erase;
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- slave->master = master;
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- slave->offset = parts[i].offset;
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- slave->index = i;
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-
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- if (slave->offset == MTDPART_OFS_APPEND)
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- slave->offset = cur_offset;
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- if (slave->offset == MTDPART_OFS_NXTBLK) {
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- 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
|
|
}
|
|
}
|
|
|
|
@@ -557,6 +728,32 @@
|
|
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);
|
|
--- a/drivers/mtd/devices/block2mtd.c
|
|
+++ b/drivers/mtd/devices/block2mtd.c
|
|
@@ -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;
|
|
--- a/drivers/mtd/mtdchar.c
|
|
+++ b/drivers/mtd/mtdchar.c
|
|
@@ -16,6 +16,7 @@
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/compatmac.h>
|
|
+#include <linux/mtd/partitions.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
@@ -752,6 +753,13 @@
|
|
file->f_pos = 0;
|
|
break;
|
|
}
|
|
+#ifdef CONFIG_MTD_PARTITIONS
|
|
+ case MTDREFRESH:
|
|
+ {
|
|
+ ret = refresh_mtd_partitions(mtd);
|
|
+ break;
|
|
+ }
|
|
+#endif
|
|
|
|
default:
|
|
ret = -ENOTTY;
|
|
--- a/include/linux/mtd/mtd.h
|
|
+++ b/include/linux/mtd/mtd.h
|
|
@@ -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
|
|
--- a/include/linux/mtd/partitions.h
|
|
+++ b/include/linux/mtd/partitions.h
|
|
@@ -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
|
|
--- a/include/mtd/mtd-abi.h
|
|
+++ b/include/mtd/mtd-abi.h
|
|
@@ -95,6 +95,7 @@
|
|
#define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout)
|
|
#define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats)
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#define MTDFILEMODE _IO('M', 19)
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+#define MTDREFRESH _IO('M', 23)
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/*
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* Obsolete legacy interface. Keep it in order not to break userspace
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