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149 lines
3.8 KiB
149 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* QNX6 file system, Linux implementation. |
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* |
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* Version : 1.0.0 |
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* |
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* History : |
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* |
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* 01-02-2012 by Kai Bankett ([email protected]) : first release. |
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* |
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*/ |
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#include <linux/buffer_head.h> |
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#include <linux/slab.h> |
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#include <linux/crc32.h> |
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#include "qnx6.h" |
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static void qnx6_mmi_copy_sb(struct qnx6_super_block *qsb, |
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struct qnx6_mmi_super_block *sb) |
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{ |
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qsb->sb_magic = sb->sb_magic; |
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qsb->sb_checksum = sb->sb_checksum; |
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qsb->sb_serial = sb->sb_serial; |
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qsb->sb_blocksize = sb->sb_blocksize; |
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qsb->sb_num_inodes = sb->sb_num_inodes; |
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qsb->sb_free_inodes = sb->sb_free_inodes; |
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qsb->sb_num_blocks = sb->sb_num_blocks; |
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qsb->sb_free_blocks = sb->sb_free_blocks; |
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/* the rest of the superblock is the same */ |
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memcpy(&qsb->Inode, &sb->Inode, sizeof(sb->Inode)); |
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memcpy(&qsb->Bitmap, &sb->Bitmap, sizeof(sb->Bitmap)); |
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memcpy(&qsb->Longfile, &sb->Longfile, sizeof(sb->Longfile)); |
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} |
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struct qnx6_super_block *qnx6_mmi_fill_super(struct super_block *s, int silent) |
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{ |
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struct buffer_head *bh1, *bh2 = NULL; |
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struct qnx6_mmi_super_block *sb1, *sb2; |
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struct qnx6_super_block *qsb = NULL; |
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struct qnx6_sb_info *sbi; |
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__u64 offset; |
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/* Check the superblock signatures |
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start with the first superblock */ |
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bh1 = sb_bread(s, 0); |
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if (!bh1) { |
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pr_err("Unable to read first mmi superblock\n"); |
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return NULL; |
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} |
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sb1 = (struct qnx6_mmi_super_block *)bh1->b_data; |
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sbi = QNX6_SB(s); |
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if (fs32_to_cpu(sbi, sb1->sb_magic) != QNX6_SUPER_MAGIC) { |
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if (!silent) { |
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pr_err("wrong signature (magic) in superblock #1.\n"); |
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goto out; |
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} |
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} |
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/* checksum check - start at byte 8 and end at byte 512 */ |
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if (fs32_to_cpu(sbi, sb1->sb_checksum) != |
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crc32_be(0, (char *)(bh1->b_data + 8), 504)) { |
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pr_err("superblock #1 checksum error\n"); |
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goto out; |
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} |
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/* calculate second superblock blocknumber */ |
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offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) + QNX6_SUPERBLOCK_AREA / |
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fs32_to_cpu(sbi, sb1->sb_blocksize); |
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/* set new blocksize */ |
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if (!sb_set_blocksize(s, fs32_to_cpu(sbi, sb1->sb_blocksize))) { |
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pr_err("unable to set blocksize\n"); |
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goto out; |
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} |
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/* blocksize invalidates bh - pull it back in */ |
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brelse(bh1); |
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bh1 = sb_bread(s, 0); |
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if (!bh1) |
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goto out; |
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sb1 = (struct qnx6_mmi_super_block *)bh1->b_data; |
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/* read second superblock */ |
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bh2 = sb_bread(s, offset); |
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if (!bh2) { |
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pr_err("unable to read the second superblock\n"); |
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goto out; |
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} |
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sb2 = (struct qnx6_mmi_super_block *)bh2->b_data; |
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if (fs32_to_cpu(sbi, sb2->sb_magic) != QNX6_SUPER_MAGIC) { |
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if (!silent) |
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pr_err("wrong signature (magic) in superblock #2.\n"); |
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goto out; |
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} |
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/* checksum check - start at byte 8 and end at byte 512 */ |
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if (fs32_to_cpu(sbi, sb2->sb_checksum) |
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!= crc32_be(0, (char *)(bh2->b_data + 8), 504)) { |
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pr_err("superblock #1 checksum error\n"); |
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goto out; |
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} |
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qsb = kmalloc(sizeof(*qsb), GFP_KERNEL); |
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if (!qsb) { |
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pr_err("unable to allocate memory.\n"); |
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goto out; |
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} |
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if (fs64_to_cpu(sbi, sb1->sb_serial) > |
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fs64_to_cpu(sbi, sb2->sb_serial)) { |
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/* superblock #1 active */ |
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qnx6_mmi_copy_sb(qsb, sb1); |
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#ifdef CONFIG_QNX6FS_DEBUG |
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qnx6_superblock_debug(qsb, s); |
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#endif |
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memcpy(bh1->b_data, qsb, sizeof(struct qnx6_super_block)); |
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sbi->sb_buf = bh1; |
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sbi->sb = (struct qnx6_super_block *)bh1->b_data; |
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brelse(bh2); |
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pr_info("superblock #1 active\n"); |
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} else { |
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/* superblock #2 active */ |
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qnx6_mmi_copy_sb(qsb, sb2); |
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#ifdef CONFIG_QNX6FS_DEBUG |
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qnx6_superblock_debug(qsb, s); |
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#endif |
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memcpy(bh2->b_data, qsb, sizeof(struct qnx6_super_block)); |
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sbi->sb_buf = bh2; |
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sbi->sb = (struct qnx6_super_block *)bh2->b_data; |
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brelse(bh1); |
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pr_info("superblock #2 active\n"); |
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} |
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kfree(qsb); |
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/* offset for mmi_fs is just SUPERBLOCK_AREA bytes */ |
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sbi->s_blks_off = QNX6_SUPERBLOCK_AREA / s->s_blocksize; |
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/* success */ |
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return sbi->sb; |
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out: |
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if (bh1 != NULL) |
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brelse(bh1); |
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if (bh2 != NULL) |
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brelse(bh2); |
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return NULL; |
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}
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