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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/atari.c
parent4752bc309b7604d507c973c7b7678ac2ce10a058 (diff)
downloadlinux-0-day-9be96f3fd10187f185d84cf878cf032465bcced3.tar.gz
move fs/partitions to block/
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'block/partitions/atari.c')
-rw-r--r--block/partitions/atari.c149
1 files changed, 149 insertions, 0 deletions
diff --git a/block/partitions/atari.c b/block/partitions/atari.c
new file mode 100644
index 0000000..9875b05
--- /dev/null
+++ b/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;
+}