blob: 52b100311ec3fec4b47c88a43c132a2c316314d7 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/pagemap.h>
2#include <linux/blkdev.h>
Will Drewry6d1d8052010-08-31 15:47:05 -05003#include <linux/genhd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004
5/*
6 * add_gd_partition adds a partitions details to the devices partition
7 * description.
8 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07009struct parsed_partitions {
Tejun Heo1493bf22010-05-15 20:09:30 +020010 struct block_device *bdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 char name[BDEVNAME_SIZE];
12 struct {
13 sector_t from;
14 sector_t size;
15 int flags;
Will Drewry6d1d8052010-08-31 15:47:05 -050016 bool has_info;
17 struct partition_meta_info info;
Tejun Heo689d6fa2008-08-25 19:56:16 +090018 } parts[DISK_MAX_PARTS];
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 int next;
20 int limit;
Tejun Heob403a982010-05-15 20:09:31 +020021 bool access_beyond_eod;
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -070022 char *pp_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070023};
24
Al Viro94ea4152011-09-16 00:45:36 -040025struct parsed_partitions *
26check_partition(struct gendisk *, struct block_device *);
27
Tejun Heo1493bf22010-05-15 20:09:30 +020028static inline void *read_part_sector(struct parsed_partitions *state,
29 sector_t n, Sector *p)
30{
Tejun Heob403a982010-05-15 20:09:31 +020031 if (n >= get_capacity(state->bdev->bd_disk)) {
32 state->access_beyond_eod = true;
33 return NULL;
34 }
Tejun Heo1493bf22010-05-15 20:09:30 +020035 return read_dev_sector(state->bdev, n, p);
36}
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038static inline void
39put_partition(struct parsed_partitions *p, int n, sector_t from, sector_t size)
40{
41 if (n < p->limit) {
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -070042 char tmp[1 + BDEVNAME_SIZE + 10 + 1];
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 p->parts[n].from = from;
45 p->parts[n].size = size;
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -070046 snprintf(tmp, sizeof(tmp), " %s%d", p->name, n);
47 strlcat(p->pp_buf, tmp, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 }
49}
50
51extern int warn_no_part;
52