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