diff options
author | Sascha Hauer <s.hauer@pengutronix.de> | 2024-02-19 09:31:38 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2024-02-20 11:46:30 +0100 |
commit | 8f48e6366cbbf132a91c49bff862e98066a5c530 (patch) | |
tree | 7493f1dfb3032964cddb3a7c27141d94369c39aa | |
parent | 914f24316014b04ce3d6dbbb99cb7c659f4bf066 (diff) | |
download | barebox-8f48e6366cbb.tar.gz barebox-8f48e6366cbb.tar.xz |
partitions: dos: implement partition manipulation support
This fills in the msdos specific function hooks to add/remove
partitions.
Link: https://lore.barebox.org/20240219083140.2713047-11-s.hauer@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r-- | common/partitions/dos.c | 256 |
1 files changed, 243 insertions, 13 deletions
diff --git a/common/partitions/dos.c b/common/partitions/dos.c index e5ff59f71a..9bb51bce85 100644 --- a/common/partitions/dos.c +++ b/common/partitions/dos.c @@ -15,10 +15,26 @@ #include <common.h> #include <disks.h> #include <init.h> +#include <stdlib.h> #include <asm/unaligned.h> #include <linux/err.h> #include <partitions.h> +struct dos_partition_desc { + struct partition_desc pd; + uint32_t signature; +}; + +struct dos_partition { + struct partition part; + bool extended; + bool logical; + + uint8_t boot_indicator; + uint8_t chs_begin[3]; + uint8_t type; + uint8_t chs_end[3]; +}; enum { /* These three have identical behaviour; use the second one if DOS FDISK gets @@ -105,13 +121,14 @@ static int dos_get_disk_signature(struct param_d *p, void *_priv) return 0; } -static void dos_extended_partition(struct block_device *blk, struct partition_desc *pd, +static void dos_extended_partition(struct block_device *blk, struct dos_partition_desc *dpd, struct partition *partition, uint32_t signature) { uint8_t *buf = malloc(SECTOR_SIZE); uint32_t ebr_sector = partition->first_sec; struct partition_entry *table = (struct partition_entry *)&buf[0x1be]; unsigned partno = 5; + struct dos_partition *dpart; struct partition *pentry; while (1) { @@ -138,7 +155,14 @@ static void dos_extended_partition(struct block_device *blk, struct partition_de } /* /sanity checks */ - pentry = xzalloc(sizeof(*pentry)); + dpart = xzalloc(sizeof(*dpart)); + dpart->logical = true; + dpart->boot_indicator = table[0].boot_indicator; + memcpy(dpart->chs_begin, table[0].chs_begin, sizeof(table[0].chs_begin)); + dpart->type = table[0].type; + memcpy(dpart->chs_end, table[0].chs_end, sizeof(table[0].chs_end)); + + pentry = &dpart->part; /* the first entry defines the extended partition */ pentry->first_sec = ebr_sector + @@ -150,7 +174,7 @@ static void dos_extended_partition(struct block_device *blk, struct partition_de sprintf(pentry->partuuid, "%08x-%02u", signature, partno); - list_add_tail(&pentry->list, &pd->partitions); + list_add_tail(&pentry->list, &dpd->pd.partitions); partno++; /* the second entry defines the start of the next ebr if != 0 */ @@ -177,13 +201,14 @@ out: static struct partition_desc *dos_partition(void *buf, struct block_device *blk) { struct partition_entry *table; + struct dos_partition *dpart; struct partition *pentry; struct partition *extended_partition = NULL; uint8_t *buffer = buf; int i; struct disk_signature_priv *dsp; uint32_t signature = get_unaligned_le32(buf + 0x1b8); - struct partition_desc *pd; + struct dos_partition_desc *dpd; if (signature) sprintf(blk->cdev.diskuuid, "%08x", signature); @@ -192,8 +217,8 @@ static struct partition_desc *dos_partition(void *buf, struct block_device *blk) table = (struct partition_entry *)&buffer[446]; - pd = xzalloc(sizeof(*pd)); - INIT_LIST_HEAD(&pd->partitions); + dpd = xzalloc(sizeof(*dpd)); + partition_desc_init(&dpd->pd, blk); for (i = 0; i < 4; i++) { uint64_t first_sec = get_unaligned_le32(&table[i].partition_start); @@ -203,16 +228,26 @@ static struct partition_desc *dos_partition(void *buf, struct block_device *blk) continue; } - pentry = xzalloc(sizeof(*pentry)); + dpart = xzalloc(sizeof(*dpart)); + dpart->boot_indicator = table[i].boot_indicator; + memcpy(dpart->chs_begin, table[i].chs_begin, sizeof(table[i].chs_begin)); + dpart->type = table[i].type; + memcpy(dpart->chs_end, table[i].chs_end, sizeof(table[i].chs_end)); + + pentry = &dpart->part; pentry->first_sec = first_sec; pentry->size = get_unaligned_le32(&table[i].partition_size); pentry->dos_partition_type = table[i].type; + pentry->num = i + 1; - if (signature) + if (signature) { sprintf(pentry->partuuid, "%08x-%02d", signature, i + 1); + dpd->signature = signature; + } if (is_extended_partition(pentry)) { + dpart->extended = true; pentry->size = 2; if (!extended_partition) @@ -226,11 +261,11 @@ static struct partition_desc *dos_partition(void *buf, struct block_device *blk) dev_warn(blk->dev, "Skipping additional extended partition\n"); } - list_add_tail(&pentry->list, &pd->partitions); + list_add_tail(&pentry->list, &dpd->pd.partitions); } if (extended_partition) - dos_extended_partition(blk, pd, extended_partition, signature); + dos_extended_partition(blk, dpd, extended_partition, signature); dsp = xzalloc(sizeof(*dsp)); dsp->blk = blk; @@ -249,23 +284,218 @@ static struct partition_desc *dos_partition(void *buf, struct block_device *blk) dos_set_disk_signature, dos_get_disk_signature, &dsp->signature, "%08x", dsp); - return pd; + return &dpd->pd; } static void dos_partition_free(struct partition_desc *pd) { struct partition *part, *tmp; - list_for_each_entry_safe(part, tmp, &pd->partitions, list) - free(part); + list_for_each_entry_safe(part, tmp, &pd->partitions, list) { + struct dos_partition *dpart = container_of(part, struct dos_partition, part); + + free(dpart); + } free(pd); } +static __maybe_unused struct partition_desc *dos_partition_create_table(struct block_device *blk) +{ + struct dos_partition_desc *dpd = xzalloc(512); + + partition_desc_init(&dpd->pd, blk); + + dpd->signature = random32(); + + return &dpd->pd; +} + +static int fs_type_to_type(const char *fstype) +{ + unsigned long type; + int ret; + + if (!strcmp(fstype, "ext2")) + return 0x83; + if (!strcmp(fstype, "ext3")) + return 0x83; + if (!strcmp(fstype, "ext4")) + return 0x83; + if (!strcmp(fstype, "fat16")) + return 0xe; + if (!strcmp(fstype, "fat32")) + return 0xc; + + ret = kstrtoul(fstype, 16, &type); + if (ret) + return ret; + + if (type > 0xff) + return -EINVAL; + + return type; +} + +static __maybe_unused int dos_partition_mkpart(struct partition_desc *pd, + const char *name, const char *fs_type, + uint64_t start_lba, uint64_t end_lba) +{ + struct dos_partition *dpart; + struct partition *part, *part_extended = NULL; + int npart = 0, npart_logical = 0; + uint64_t size; + int mask_free = 0xf; + int type = fs_type_to_type(fs_type); + + if (type < 0) { + pr_err("invalid fs_type \"%s\"\n", fs_type); + return -EINVAL; + } + + if (start_lba < 1) { + pr_err("invalid start LBA, minimum is 1\n"); + return -EINVAL; + } + + list_for_each_entry(part, &pd->partitions, list) { + dpart = container_of(part, struct dos_partition, part); + + mask_free &= ~(1 << npart); + + if (dpart->extended) + part_extended = part; + if (dpart->logical) + npart_logical++; + else + npart++; + } + + if (!strcmp(name, "extended")) { + if (part_extended) { + pr_err("extended partition already exists\n"); + return -ENOSPC; + } + goto create; + } else if (!strcmp(name, "primary")) { + if (npart == 4) { + pr_err("Can't create any more partitions\n"); + return -ENOSPC; + } + + goto create; + } else if (!strcmp(name, "logical")) { + if (!part_extended) { + pr_err("No extended partition\n"); + return -EINVAL; + } + + if (npart_logical >= 4) { + pr_err("Can't create any more partitions\n"); + return -ENOSPC; + } + + pr_err("Can't create logical partitions yet\n"); + return -EINVAL; + } else { + pr_err("Invalid name \"%s\"\n", name); + return -EINVAL; + } + + return 0; + +create: + dpart = xzalloc(sizeof(*dpart)); + part = &dpart->part; + + if (start_lba > UINT_MAX) + return -ENOSPC; + size = end_lba - start_lba + 1; + + if (size > UINT_MAX) + return -ENOSPC; + + dpart->type = fs_type_to_type(fs_type); + + part->first_sec = start_lba; + part->size = size; + part->num = ffs(mask_free); + + list_add_tail(&part->list, &pd->partitions); + + return 0; +} + +static __maybe_unused int dos_partition_rmpart(struct partition_desc *pd, struct partition *part) +{ + struct dos_partition *dpart = container_of(part, struct dos_partition, part); + + list_del(&part->list); + free(dpart); + + return 0; +} + +static __maybe_unused int dos_partition_write(struct partition_desc *pd) +{ + struct dos_partition_desc *dpd = container_of(pd, struct dos_partition_desc, pd); + struct dos_partition *dpart; + struct partition *part; + void *buf; + struct partition_entry *table, *entry; + int ret; + + list_for_each_entry(part, &pd->partitions, list) { + dpart = container_of(part, struct dos_partition, part); + if (dpart->logical) { + pr_err("Cannot write tables with logical partitions yet\n"); + return -EINVAL; + } + } + + buf = read_mbr(pd->blk); + if (!buf) + return -EIO; + + put_unaligned_le32(dpd->signature, buf + 0x1b8); + + table = buf + 0x1be; + memset(table, 0x0, sizeof(*table) * 4); + + *(u8 *)(buf + 0x1fe) = 0x55; + *(u8 *)(buf + 0x1ff) = 0xaa; + + list_for_each_entry(part, &pd->partitions, list) { + dpart = container_of(part, struct dos_partition, part); + + entry = &table[part->num - 1]; + + entry->boot_indicator = dpart->boot_indicator; + memcpy(entry->chs_begin, dpart->chs_begin, sizeof(entry->chs_begin)); + entry->type = dpart->type; + memcpy(entry->chs_end, dpart->chs_end, sizeof(entry->chs_end)); + put_unaligned_le32(part->first_sec, &entry->partition_start); + put_unaligned_le32(part->size, &entry->partition_size); + } + + ret = block_write(pd->blk, buf, 0, 1); + + free(buf); + + return ret; +} + static struct partition_parser dos = { .parse = dos_partition, .partition_free = dos_partition_free, +#ifdef CONFIG_PARTITION_MANIPULATION + .create = dos_partition_create_table, + .mkpart = dos_partition_mkpart, + .rmpart = dos_partition_rmpart, + .write = dos_partition_write, +#endif .type = filetype_mbr, + .name = "msdos", }; static int dos_partition_init(void) |