Messages in this thread Patch in this message | | | Date | Sun, 13 Oct 2002 11:56:50 +0200 | From | Anders Larsen <> | Subject | [PATCH][RESEND] 2.5.42 qnx4fs (2/2): recognize qnx6 file-systems |
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Hi Linus, please apply this patch (a forward port from 2.4.19) which replaces the check for the QNX boot-sector signature by a check for another signature in the superblock (the (invariant) name of the root dir). This allows us to mount partitions created with QNX 6.1+ (that don't have the boot-sector signature we used to check for), without breaking existing functionality.
fs/Config.help already claims we have this functionality, so the code really needs to be updated to reflect that...
Cheers Anders (qnx4fs maintainer)
diff -ur linux-2.5.42.qnx4fs-patch1/fs/qnx4/inode.c linux-2.5.42/fs/qnx4/inode.c --- linux-2.5.42.qnx4fs-patch1/fs/qnx4/inode.c Sun Oct 13 10:53:54 2002 +++ linux-2.5.42/fs/qnx4/inode.c Sun Oct 13 10:54:35 2002 @@ -356,26 +356,19 @@ sb_set_blocksize(s, QNX4_BLOCK_SIZE); - /* Check the boot signature. Since the qnx4 code is + /* Check the superblock signature. Since the qnx4 code is dangerous, we should leave as quickly as possible if we don't belong here... */ - bh = sb_bread(s, 0); + bh = sb_bread(s, 1); if (!bh) { - printk("qnx4: unable to read the boot sector\n"); + printk("qnx4: unable to read the superblock\n"); goto outnobh; } - if ( memcmp( (char*)bh->b_data + 4, "QNX4FS", 6 ) ) { + if ( le32_to_cpu( *(__u32*)bh->b_data ) != QNX4_SUPER_MAGIC ) { if (!silent) - printk("qnx4: wrong fsid in boot sector.\n"); + printk("qnx4: wrong fsid in superblock.\n"); goto out; } - brelse(bh); - - bh = sb_bread(s, 1); - if (!bh) { - printk("qnx4: unable to read the superblock\n"); - goto outnobh; - } s->s_op = &qnx4_sops; s->s_magic = QNX4_SUPER_MAGIC; #ifndef CONFIG_QNX4FS_RW @@ -583,7 +576,7 @@ return err; } - printk("QNX4 filesystem 0.2.2 registered.\n"); + printk("QNX4 filesystem 0.2.3 registered.\n"); return 0; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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