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authorWill Drewry <wad@chromium.org>2010-08-31 15:47:05 -0500
committerJens Axboe <jaxboe@fusionio.com>2010-09-15 16:13:18 +0200
commit6d1d8050b4bc89d0165d29b58e894aeba2564a97 (patch)
treeb5c5b730bd7b80fe9041c031a6fcf08f42fff0d5 /include/linux/genhd.h
parent144177991ca624841ddbd1e7edff958fc0f6d1fe (diff)
downloadop-kernel-dev-6d1d8050b4bc89d0165d29b58e894aeba2564a97.zip
op-kernel-dev-6d1d8050b4bc89d0165d29b58e894aeba2564a97.tar.gz
block, partition: add partition_meta_info to hd_struct
I'm reposting this patch series as v4 since there have been no additional comments, and I cleaned up one extra bit of unneeded code (in 3/3). The patches are against Linus's tree: 2bfc96a127bc1cc94d26bfaa40159966064f9c8c (2.6.36-rc3). Would this patchset be suitable for inclusion in an mm branch? This changes adds a partition_meta_info struct which itself contains a union of structures that provide partition table specific metadata. This change leaves the union empty. The subsequent patch includes an implementation for CONFIG_EFI_PARTITION-based metadata. Signed-off-by: Will Drewry <wad@chromium.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'include/linux/genhd.h')
-rw-r--r--include/linux/genhd.h53
1 files changed, 51 insertions, 2 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 5f2f4c4..66e26b5 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -12,6 +12,7 @@
#include <linux/types.h>
#include <linux/kdev_t.h>
#include <linux/rcupdate.h>
+#include <linux/slab.h>
#ifdef CONFIG_BLOCK
@@ -86,7 +87,15 @@ struct disk_stats {
unsigned long io_ticks;
unsigned long time_in_queue;
};
-
+
+#define PARTITION_META_INFO_VOLNAMELTH 64
+#define PARTITION_META_INFO_UUIDLTH 16
+
+struct partition_meta_info {
+ u8 uuid[PARTITION_META_INFO_UUIDLTH]; /* always big endian */
+ u8 volname[PARTITION_META_INFO_VOLNAMELTH];
+};
+
struct hd_struct {
sector_t start_sect;
sector_t nr_sects;
@@ -95,6 +104,7 @@ struct hd_struct {
struct device __dev;
struct kobject *holder_dir;
int policy, partno;
+ struct partition_meta_info *info;
#ifdef CONFIG_FAIL_MAKE_REQUEST
int make_it_fail;
#endif
@@ -181,6 +191,30 @@ static inline struct gendisk *part_to_disk(struct hd_struct *part)
return NULL;
}
+static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
+{
+ int i;
+ for (i = 0; i < 16; ++i) {
+ *to++ = (hex_to_bin(*uuid_str) << 4) |
+ (hex_to_bin(*(uuid_str + 1)));
+ uuid_str += 2;
+ switch (i) {
+ case 3:
+ case 5:
+ case 7:
+ case 9:
+ uuid_str++;
+ continue;
+ }
+ }
+}
+
+static inline char *part_unpack_uuid(const u8 *uuid, char *out)
+{
+ sprintf(out, "%pU", uuid);
+ return out;
+}
+
static inline int disk_max_parts(struct gendisk *disk)
{
if (disk->flags & GENHD_FL_EXT_DEVT)
@@ -342,6 +376,19 @@ static inline int part_in_flight(struct hd_struct *part)
return part->in_flight[0] + part->in_flight[1];
}
+static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
+{
+ if (disk)
+ return kzalloc_node(sizeof(struct partition_meta_info),
+ GFP_KERNEL, disk->node_id);
+ return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
+}
+
+static inline void free_part_info(struct hd_struct *part)
+{
+ kfree(part->info);
+}
+
/* block/blk-core.c */
extern void part_round_stats(int cpu, struct hd_struct *part);
@@ -533,7 +580,9 @@ extern int disk_expand_part_tbl(struct gendisk *disk, int target);
extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
int partno, sector_t start,
- sector_t len, int flags);
+ sector_t len, int flags,
+ struct partition_meta_info
+ *info);
extern void delete_partition(struct gendisk *, int);
extern void printk_all_partitions(void);
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