Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / block / partitions / sgi.c

diff --git a/kernel/block/partitions/sgi.c b/kernel/block/partitions/sgi.c
new file mode 100644 (file)
index 0000000..ea8a86d
--- /dev/null
+++ b/kernel/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;
+}