Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 171 insertions, 0 deletions

diff --git a/fs/hfsplus/wrapper.c b/fs/hfsplus/wrapper.c
new file mode 100644
index 0000000..0c51d63
--- /dev/null
+++ b/fs/hfsplus/wrapper.c
@@ -0,0 +1,171 @@
+/*
+ *  linux/fs/hfsplus/wrapper.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Handling of HFS wrappers around HFS+ volumes
+ */
+
+#include <linux/fs.h>
+#include <linux/blkdev.h>
+#include <linux/cdrom.h>
+#include <linux/genhd.h>
+#include <linux/version.h>
+#include <asm/unaligned.h>
+
+#include "hfsplus_fs.h"
+#include "hfsplus_raw.h"
+
+struct hfsplus_wd {
+	u32 ablk_size;
+	u16 ablk_start;
+	u16 embed_start;
+	u16 embed_count;
+};
+
+static int hfsplus_read_mdb(void *bufptr, struct hfsplus_wd *wd)
+{
+	u32 extent;
+	u16 attrib;
+
+	if (be16_to_cpu(*(__be16 *)(bufptr + HFSP_WRAPOFF_EMBEDSIG)) != HFSPLUS_VOLHEAD_SIG)
+		return 0;
+
+	attrib = be16_to_cpu(*(__be16 *)(bufptr + HFSP_WRAPOFF_ATTRIB));
+	if (!(attrib & HFSP_WRAP_ATTRIB_SLOCK) ||
+	   !(attrib & HFSP_WRAP_ATTRIB_SPARED))
+		return 0;
+
+	wd->ablk_size = be32_to_cpu(*(__be32 *)(bufptr + HFSP_WRAPOFF_ABLKSIZE));
+	if (wd->ablk_size < HFSPLUS_SECTOR_SIZE)
+		return 0;
+	if (wd->ablk_size % HFSPLUS_SECTOR_SIZE)
+		return 0;
+	wd->ablk_start = be16_to_cpu(*(__be16 *)(bufptr + HFSP_WRAPOFF_ABLKSTART));
+
+	extent = be32_to_cpu(get_unaligned((__be32 *)(bufptr + HFSP_WRAPOFF_EMBEDEXT)));
+	wd->embed_start = (extent >> 16) & 0xFFFF;
+	wd->embed_count = extent & 0xFFFF;
+
+	return 1;
+}
+
+static int hfsplus_get_last_session(struct super_block *sb,
+				    sector_t *start, sector_t *size)
+{
+	struct cdrom_multisession ms_info;
+	struct cdrom_tocentry te;
+	int res;
+
+	/* default values */
+	*start = 0;
+	*size = sb->s_bdev->bd_inode->i_size >> 9;
+
+	if (HFSPLUS_SB(sb).session >= 0) {
+		te.cdte_track = HFSPLUS_SB(sb).session;
+		te.cdte_format = CDROM_LBA;
+		res = ioctl_by_bdev(sb->s_bdev, CDROMREADTOCENTRY, (unsigned long)&te);
+		if (!res && (te.cdte_ctrl & CDROM_DATA_TRACK) == 4) {
+			*start = (sector_t)te.cdte_addr.lba << 2;
+			return 0;
+		}
+		printk(KERN_ERR "HFS: Invalid session number or type of track\n");
+		return -EINVAL;
+	}
+	ms_info.addr_format = CDROM_LBA;
+	res = ioctl_by_bdev(sb->s_bdev, CDROMMULTISESSION, (unsigned long)&ms_info);
+	if (!res && ms_info.xa_flag)
+		*start = (sector_t)ms_info.addr.lba << 2;
+	return 0;
+}
+
+/* Find the volume header and fill in some minimum bits in superblock */
+/* Takes in super block, returns true if good data read */
+int hfsplus_read_wrapper(struct super_block *sb)
+{
+	struct buffer_head *bh;
+	struct hfsplus_vh *vhdr;
+	struct hfsplus_wd wd;
+	sector_t part_start, part_size;
+	u32 blocksize;
+
+	blocksize = sb_min_blocksize(sb, HFSPLUS_SECTOR_SIZE);
+	if (!blocksize)
+		return -EINVAL;
+
+	if (hfsplus_get_last_session(sb, &part_start, &part_size))
+		return -EINVAL;
+	while (1) {
+		bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr);
+		if (!bh)
+			return -EIO;
+
+		if (vhdr->signature == cpu_to_be16(HFSP_WRAP_MAGIC)) {
+			if (!hfsplus_read_mdb(vhdr, &wd))
+				goto error;
+			wd.ablk_size >>= HFSPLUS_SECTOR_SHIFT;
+			part_start += wd.ablk_start + wd.embed_start * wd.ablk_size;
+			part_size = wd.embed_count * wd.ablk_size;
+			brelse(bh);
+			bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr);
+			if (!bh)
+				return -EIO;
+		}
+		if (vhdr->signature == cpu_to_be16(HFSPLUS_VOLHEAD_SIG))
+			break;
+		brelse(bh);
+
+		/* check for a partition block
+		 * (should do this only for cdrom/loop though)
+		 */
+		if (hfs_part_find(sb, &part_start, &part_size))
+			return -EINVAL;
+	}
+
+	blocksize = be32_to_cpu(vhdr->blocksize);
+	brelse(bh);
+
+	/* block size must be at least as large as a sector
+	 * and a multiple of 2
+	 */
+	if (blocksize < HFSPLUS_SECTOR_SIZE ||
+	    ((blocksize - 1) & blocksize))
+		return -EINVAL;
+	HFSPLUS_SB(sb).alloc_blksz = blocksize;
+	HFSPLUS_SB(sb).alloc_blksz_shift = 0;
+	while ((blocksize >>= 1) != 0)
+		HFSPLUS_SB(sb).alloc_blksz_shift++;
+	blocksize = min(HFSPLUS_SB(sb).alloc_blksz, (u32)PAGE_SIZE);
+
+	/* align block size to block offset */
+	while (part_start & ((blocksize >> HFSPLUS_SECTOR_SHIFT) - 1))
+		blocksize >>= 1;
+
+	if (sb_set_blocksize(sb, blocksize) != blocksize) {
+		printk("HFS+: unable to blocksize to %u!\n", blocksize);
+		return -EINVAL;
+	}
+
+	HFSPLUS_SB(sb).blockoffset = part_start >>
+			(sb->s_blocksize_bits - HFSPLUS_SECTOR_SHIFT);
+	HFSPLUS_SB(sb).sect_count = part_size;
+	HFSPLUS_SB(sb).fs_shift = HFSPLUS_SB(sb).alloc_blksz_shift -
+			sb->s_blocksize_bits;
+
+	bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr);
+	if (!bh)
+		return -EIO;
+
+	/* should still be the same... */
+	if (be16_to_cpu(vhdr->signature) != HFSPLUS_VOLHEAD_SIG)
+		goto error;
+	HFSPLUS_SB(sb).s_vhbh = bh;
+	HFSPLUS_SB(sb).s_vhdr = vhdr;
+
+	return 0;
+ error:
+	brelse(bh);
+	return -EINVAL;
+}