Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/block/partitions/atari.c b/kernel/block/partitions/atari.c
new file mode 100644 (file)
index 0000000..9875b05
--- /dev/null
+++ b/kernel/block/partitions/atari.c
@@ -0,0 +1,149 @@
+/*
+ *  fs/partitions/atari.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include <linux/ctype.h>
+#include "check.h"
+#include "atari.h"
+
+/* ++guenther: this should be settable by the user ("make config")?.
+ */
+#define ICD_PARTS
+
+/* check if a partition entry looks valid -- Atari format is assumed if at
+   least one of the primary entries is ok this way */
+#define        VALID_PARTITION(pi,hdsiz)                                            \
+    (((pi)->flg & 1) &&                                                             \
+     isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
+     be32_to_cpu((pi)->st) <= (hdsiz) &&                                    \
+     be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
+
+static inline int OK_id(char *s)
+{
+       return  memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||
+               memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||
+               memcmp (s, "RAW", 3) == 0 ;
+}
+
+int atari_partition(struct parsed_partitions *state)
+{
+       Sector sect;
+       struct rootsector *rs;
+       struct partition_info *pi;
+       u32 extensect;
+       u32 hd_size;
+       int slot;
+#ifdef ICD_PARTS
+       int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
+#endif
+
+       rs = read_part_sector(state, 0, &sect);
+       if (!rs)
+               return -1;
+
+       /* Verify this is an Atari rootsector: */
+       hd_size = state->bdev->bd_inode->i_size >> 9;
+       if (!VALID_PARTITION(&rs->part[0], hd_size) &&
+           !VALID_PARTITION(&rs->part[1], hd_size) &&
+           !VALID_PARTITION(&rs->part[2], hd_size) &&
+           !VALID_PARTITION(&rs->part[3], hd_size)) {
+               /*
+                * if there's no valid primary partition, assume that no Atari
+                * format partition table (there's no reliable magic or the like
+                * :-()
+                */
+               put_dev_sector(sect);
+               return 0;
+       }
+
+       pi = &rs->part[0];
+       strlcat(state->pp_buf, " AHDI", PAGE_SIZE);
+       for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {
+               struct rootsector *xrs;
+               Sector sect2;
+               ulong partsect;
+
+               if ( !(pi->flg & 1) )
+                       continue;
+               /* active partition */
+               if (memcmp (pi->id, "XGM", 3) != 0) {
+                       /* we don't care about other id's */
+                       put_partition (state, slot, be32_to_cpu(pi->st),
+                                       be32_to_cpu(pi->siz));
+                       continue;
+               }
+               /* extension partition */
+#ifdef ICD_PARTS
+               part_fmt = 1;
+#endif
+               strlcat(state->pp_buf, " XGM<", PAGE_SIZE);
+               partsect = extensect = be32_to_cpu(pi->st);
+               while (1) {
+                       xrs = read_part_sector(state, partsect, &sect2);
+                       if (!xrs) {
+                               printk (" block %ld read failed\n", partsect);
+                               put_dev_sector(sect);
+                               return -1;
+                       }
+
+                       /* ++roman: sanity check: bit 0 of flg field must be set */
+                       if (!(xrs->part[0].flg & 1)) {
+                               printk( "\nFirst sub-partition in extended partition is not valid!\n" );
+                               put_dev_sector(sect2);
+                               break;
+                       }
+
+                       put_partition(state, slot,
+                                  partsect + be32_to_cpu(xrs->part[0].st),
+                                  be32_to_cpu(xrs->part[0].siz));
+
+                       if (!(xrs->part[1].flg & 1)) {
+                               /* end of linked partition list */
+                               put_dev_sector(sect2);
+                               break;
+                       }
+                       if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
+                               printk("\nID of extended partition is not XGM!\n");
+                               put_dev_sector(sect2);
+                               break;
+                       }
+
+                       partsect = be32_to_cpu(xrs->part[1].st) + extensect;
+                       put_dev_sector(sect2);
+                       if (++slot == state->limit) {
+                               printk( "\nMaximum number of partitions reached!\n" );
+                               break;
+                       }
+               }
+               strlcat(state->pp_buf, " >", PAGE_SIZE);
+       }
+#ifdef ICD_PARTS
+       if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */
+               pi = &rs->icdpart[0];
+               /* sanity check: no ICD format if first partition invalid */
+               if (OK_id(pi->id)) {
+                       strlcat(state->pp_buf, " ICD<", PAGE_SIZE);
+                       for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {
+                               /* accept only GEM,BGM,RAW,LNX,SWP partitions */
+                               if (!((pi->flg & 1) && OK_id(pi->id)))
+                                       continue;
+                               part_fmt = 2;
+                               put_partition (state, slot,
+                                               be32_to_cpu(pi->st),
+                                               be32_to_cpu(pi->siz));
+                       }
+                       strlcat(state->pp_buf, " >", PAGE_SIZE);
+               }
+       }
+#endif
+       put_dev_sector(sect);
+
+       strlcat(state->pp_buf, "\n", PAGE_SIZE);
+
+       return 1;
+}