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authorAl Viro <viro@zeniv.linux.org.uk>2011-09-16 00:25:05 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-01-03 22:54:06 -0500
commit9be96f3fd10187f185d84cf878cf032465bcced3 (patch)
tree432a430ed9e0cbe0c18916cd3c3992f09b3feb37 /block/partitions/sgi.c
parent4752bc309b7604d507c973c7b7678ac2ce10a058 (diff)
downloadlinux-9be96f3fd10187f185d84cf878cf032465bcced3.tar.gz
move fs/partitions to block/
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'block/partitions/sgi.c')
-rw-r--r--block/partitions/sgi.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/block/partitions/sgi.c b/block/partitions/sgi.c
new file mode 100644
index 00000000000..ea8a86dceaf
--- /dev/null
+++ b/block/partitions/sgi.c
@@ -0,0 +1,82 @@
+/*
+ * fs/partitions/sgi.c
+ *
+ * Code extracted from drivers/block/genhd.c
+ */
+
+#include "check.h"
+#include "sgi.h"
+
+struct sgi_disklabel {
+ __be32 magic_mushroom; /* Big fat spliff... */
+ __be16 root_part_num; /* Root partition number */
+ __be16 swap_part_num; /* Swap partition number */
+ s8 boot_file[16]; /* Name of boot file for ARCS */
+ u8 _unused0[48]; /* Device parameter useless crapola.. */
+ struct sgi_volume {
+ s8 name[8]; /* Name of volume */
+ __be32 block_num; /* Logical block number */
+ __be32 num_bytes; /* How big, in bytes */
+ } volume[15];
+ struct sgi_partition {
+ __be32 num_blocks; /* Size in logical blocks */
+ __be32 first_block; /* First logical block */
+ __be32 type; /* Type of this partition */
+ } partitions[16];
+ __be32 csum; /* Disk label checksum */
+ __be32 _unused1; /* Padding */
+};
+
+int sgi_partition(struct parsed_partitions *state)
+{
+ int i, csum;
+ __be32 magic;
+ int slot = 1;
+ unsigned int start, blocks;
+ __be32 *ui, cs;
+ Sector sect;
+ struct sgi_disklabel *label;
+ struct sgi_partition *p;
+ char b[BDEVNAME_SIZE];
+
+ label = read_part_sector(state, 0, &sect);
+ if (!label)
+ return -1;
+ p = &label->partitions[0];
+ magic = label->magic_mushroom;
+ if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) {
+ /*printk("Dev %s SGI disklabel: bad magic %08x\n",
+ bdevname(bdev, b), be32_to_cpu(magic));*/
+ put_dev_sector(sect);
+ return 0;
+ }
+ ui = ((__be32 *) (label + 1)) - 1;
+ for(csum = 0; ui >= ((__be32 *) label);) {
+ cs = *ui--;
+ csum += be32_to_cpu(cs);
+ }
+ if(csum) {
+ printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n",
+ bdevname(state->bdev, b));
+ put_dev_sector(sect);
+ return 0;
+ }
+ /* All SGI disk labels have 16 partitions, disks under Linux only
+ * have 15 minor's. Luckily there are always a few zero length
+ * partitions which we don't care about so we never overflow the
+ * current_minor.
+ */
+ for(i = 0; i < 16; i++, p++) {
+ blocks = be32_to_cpu(p->num_blocks);
+ start = be32_to_cpu(p->first_block);
+ if (blocks) {
+ put_partition(state, slot, start, blocks);
+ if (be32_to_cpu(p->type) == LINUX_RAID_PARTITION)
+ state->parts[slot].flags = ADDPART_FLAG_RAID;
+ }
+ slot++;
+ }
+ strlcat(state->pp_buf, "\n", PAGE_SIZE);
+ put_dev_sector(sect);
+ return 1;
+}