mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 02:38:56 +00:00
106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
|
// SPDX-License-Identifier: GPL-2.0+
|
||
|
|
#include "internal.h"
|
||
|
|
|
||
|
|
static bool check_layout_compatibility(struct erofs_sb_info *sbi,
|
||
|
|
struct erofs_super_block *dsb)
|
||
|
|
{
|
||
|
|
const unsigned int feature = le32_to_cpu(dsb->feature_incompat);
|
||
|
|
|
||
|
|
sbi->feature_incompat = feature;
|
||
|
|
|
||
|
|
/* check if current kernel meets all mandatory requirements */
|
||
|
|
if (feature & (~EROFS_ALL_FEATURE_INCOMPAT)) {
|
||
|
|
erofs_err("unidentified incompatible feature %x, please upgrade kernel version",
|
||
|
|
feature & ~EROFS_ALL_FEATURE_INCOMPAT);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int erofs_init_devices(struct erofs_sb_info *sbi,
|
||
|
|
struct erofs_super_block *dsb)
|
||
|
|
{
|
||
|
|
unsigned int ondisk_extradevs, i;
|
||
|
|
erofs_off_t pos;
|
||
|
|
|
||
|
|
sbi->total_blocks = sbi->primarydevice_blocks;
|
||
|
|
|
||
|
|
if (!erofs_sb_has_device_table())
|
||
|
|
ondisk_extradevs = 0;
|
||
|
|
else
|
||
|
|
ondisk_extradevs = le16_to_cpu(dsb->extra_devices);
|
||
|
|
|
||
|
|
if (ondisk_extradevs != sbi->extra_devices) {
|
||
|
|
erofs_err("extra devices don't match (ondisk %u, given %u)",
|
||
|
|
ondisk_extradevs, sbi->extra_devices);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
if (!ondisk_extradevs)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
sbi->device_id_mask = roundup_pow_of_two(ondisk_extradevs + 1) - 1;
|
||
|
|
sbi->devs = calloc(ondisk_extradevs, sizeof(*sbi->devs));
|
||
|
|
pos = le16_to_cpu(dsb->devt_slotoff) * EROFS_DEVT_SLOT_SIZE;
|
||
|
|
for (i = 0; i < ondisk_extradevs; ++i) {
|
||
|
|
struct erofs_deviceslot dis;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = erofs_dev_read(0, &dis, pos, sizeof(dis));
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
sbi->devs[i].mapped_blkaddr = dis.mapped_blkaddr;
|
||
|
|
sbi->total_blocks += dis.blocks;
|
||
|
|
pos += EROFS_DEVT_SLOT_SIZE;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int erofs_read_superblock(void)
|
||
|
|
{
|
||
|
|
char data[EROFS_BLKSIZ];
|
||
|
|
struct erofs_super_block *dsb;
|
||
|
|
unsigned int blkszbits;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = erofs_blk_read(data, 0, 1);
|
||
|
|
if (ret < 0) {
|
||
|
|
erofs_err("cannot read erofs superblock: %d", ret);
|
||
|
|
return -EIO;
|
||
|
|
}
|
||
|
|
dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
|
||
|
|
|
||
|
|
ret = -EINVAL;
|
||
|
|
if (le32_to_cpu(dsb->magic) != EROFS_SUPER_MAGIC_V1) {
|
||
|
|
erofs_err("cannot find valid erofs superblock");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
sbi.feature_compat = le32_to_cpu(dsb->feature_compat);
|
||
|
|
|
||
|
|
blkszbits = dsb->blkszbits;
|
||
|
|
/* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */
|
||
|
|
if (blkszbits != LOG_BLOCK_SIZE) {
|
||
|
|
erofs_err("blksize %u isn't supported on this platform",
|
||
|
|
1 << blkszbits);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!check_layout_compatibility(&sbi, dsb))
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
sbi.primarydevice_blocks = le32_to_cpu(dsb->blocks);
|
||
|
|
sbi.meta_blkaddr = le32_to_cpu(dsb->meta_blkaddr);
|
||
|
|
sbi.xattr_blkaddr = le32_to_cpu(dsb->xattr_blkaddr);
|
||
|
|
sbi.islotbits = EROFS_ISLOTBITS;
|
||
|
|
sbi.root_nid = le16_to_cpu(dsb->root_nid);
|
||
|
|
sbi.inos = le64_to_cpu(dsb->inos);
|
||
|
|
sbi.checksum = le32_to_cpu(dsb->checksum);
|
||
|
|
|
||
|
|
sbi.build_time = le64_to_cpu(dsb->build_time);
|
||
|
|
sbi.build_time_nsec = le32_to_cpu(dsb->build_time_nsec);
|
||
|
|
|
||
|
|
memcpy(&sbi.uuid, dsb->uuid, sizeof(dsb->uuid));
|
||
|
|
return erofs_init_devices(&sbi, dsb);
|
||
|
|
}
|