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block, partition: add partition_meta_info to hd_struct

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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: 2bfc96a127
(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>
This commit is contained in:
Will Drewry
2010-08-31 15:47:05 -05:00
committed by Jens Axboe
parent 144177991c
commit 6d1d8050b4
5 changed files with 76 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/genhd.h
+51 -2
View File
@@ -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);