a linux filesystem natively formatted without giving up the F/G drives used by homebrew software.
Reference: http://article.gmane.org/gmane.linux.ports.xbox.devel/7572
CODE
Index: linux-2.4.32-xbox-r1/fs/partitions/xbox.c
===================================================================
--- linux-2.4.32-xbox-r1.orig/fs/partitions/xbox.c
+++ linux-2.4.32-xbox-r1/fs/partitions/xbox.c
@@ -26,7 +26,7 @@
/*
* The offset for numbering xbox partitions:
- * We create hdX50->56
+ * We create hdX50->56 (or higher if a partition table is found in sector 0)
*/
#define XBOX_PARTITION_OFFSET 50
@@ -51,6 +51,26 @@
#define XBOX_SECTOR_MAGIC (3L)
+#define XBOX_PARTITION_IN_USE 0x80000000
+
+typedef struct
+{
+ char name[16];
+ u32 flags;
+ u32 start;
+ u32 size;
+ u32 reserved;
+} xbox_partition_entry;
+
+
+typedef struct
+{
+ char magic[16];
+ char reserved[32];
+ xbox_partition_entry partitions[14];
+} xbox_partition_table;
+
+
static int
xbox_sig_string_match( struct block_device *bdev,
unsigned long at_sector,
@@ -101,6 +121,33 @@ xbox_drive_detect(struct block_device *b
(xbox_sig_string_match(bdev,XBOX_SECTOR_STORE ,"FATX"))) {
return 1; //success
}
+
+ return 0; // no xbox drive
+}
+
+static inline int
+xbox_ptbl_detect(struct block_device *bdev)
+{
+ /**
+ * check for "BRFR" magic number, then for "****PARTINFO****" at
+ * start of zeroth sector. This intentionally doesn't check for
+ * FATX signatures at the expected system and store locations
+ * as it's possible for these partitions to have been moved.
+ */
+ if (xbox_sig_string_match(bdev,XBOX_SECTOR_MAGIC,"BRFR")) {
+ Sector sect;
+ int retv;
+ xbox_partition_table *table;
+
+ table = (xbox_partition_table*)read_dev_sector(bdev, XBOX_SECTOR_CONFIG, §);
+
+ if (!table) return 0;
+
+ if (strncmp(table->magic, "****PARTINFO****", 16) == 0) retv = 1; else retv = 0;
+
+ put_dev_sector(sect);
+ return retv;
+ }
return 0; // no xbox drive
}
@@ -118,8 +165,32 @@ int xbox_partition(struct gendisk *hd, s
return 0;
}
- if (xbox_drive_detect(bdev)) {
- num_sectors = (blk_size[hd->major][first_part_minor-1] << 1);
+ num_sectors = (blk_size[hd->major][first_part_minor-1] << 1);
+
+ if (xbox_ptbl_detect(bdev)) {
+ Sector sect;
+ xbox_partition_table *table;
+
+ table = (xbox_partition_table*)read_dev_sector(bdev, XBOX_SECTOR_CONFIG, §);
+
+ if (!table) return 0;
+
+ int i;
+ for (i=0; i<14; i++) {
+ xbox_partition_entry *part = &table->partitions[i];
+ if (part->flags & XBOX_PARTITION_IN_USE) {
+ if (part->start >= num_sectors)
+ printk("xbox_partition: partition %d starts off the end of the disk, at sector %d, skipping\n", i, part->start);
+ else if (part->start + part->size > num_sectors)
+ printk("xbox_partition: partition %d extends past the end of the disk, to sector %d, skipping\n",
i, part->start + part->size - 1);
+ else
+ add_gd_partition(hd,minor+i,part->start,part->size);
+ }
+ }
+
+ put_dev_sector(sect);
+ return 1;
+ } else if (xbox_drive_detect(bdev)) {
add_gd_partition(hd,minor++,XBOX_SECTOR_STORE ,XBOX_SECTORS_STORE );
add_gd_partition(hd,minor++,XBOX_SECTOR_SYSTEM,XBOX_SECTORS_SYSTEM);
add_gd_partition(hd,minor++,XBOX_SECTOR_CACHE1,XBOX_SECTORS_CACHE1);
@@ -136,6 +207,7 @@ int xbox_partition(struct gendisk *hd, s
/* Just a large F on this system - to end of drive*/
else add_gd_partition(hd,minor++,XBOX_SECTOR_EXTEND_F, num_sectors-XBOX_SECTOR_EXTEND_F);
}
+ return 0; // this will ensure other partition schemes are tried
} else {
//not an xbox drive
return 0;
Index: linux-2.4.32-xbox-r1/fs/partitions/check.c
===================================================================
--- linux-2.4.32-xbox-r1.orig/fs/partitions/check.c
+++ linux-2.4.32-xbox-r1/fs/partitions/check.c
@@ -42,6 +42,14 @@ extern int *blk_size[];
int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
static int (*check_part[])(struct gendisk *hd, struct block_device *bdev, unsigned long first_sect,
int first_minor) = {
+#ifdef CONFIG_XBOX_PARTITION
+/* do this first; if the drive is Xbox-formatted, add partitions 50+
+ * and then go ahead and look for other schemes - this way, an Xbox
+ * HD can have 2 partitioning systems: the implicit Xbox one (50+)
+ * and the explicit one (1+)
+ */
+ xbox_partition,
+#endif
#ifdef CONFIG_ACORN_PARTITION
acorn_partition,
#endif
@@ -270,12 +278,6 @@ static void check_partition(struct gendi
printk(" unknown partition table\n");
setup_devfs:
-/* if the drive is Xbox-formatted, add partitions 50+ to the existing
- partitions - this way, an Xbox HD can have 2 partitioning systems
- systems: the implicit Xbox one (50+) and the explicit one (1+) */
-#ifdef CONFIG_XBOX_PARTITION
- xbox_partition(hd, bdev, first_sector, first_part_minor);
-#endif
invalidate_bdev(bdev, 1);
truncate_inode_pages(bdev->bd_inode->i_mapping, 0);
bdput(bdev);
lol
