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: 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:
Родитель
144177991c
Коммит
6d1d8050b4
|
@ -1004,6 +1004,7 @@ static void disk_release(struct device *dev)
|
|||
kfree(disk->random);
|
||||
disk_replace_part_tbl(disk, NULL);
|
||||
free_part_stats(&disk->part0);
|
||||
free_part_info(&disk->part0);
|
||||
kfree(disk);
|
||||
}
|
||||
struct class block_class = {
|
||||
|
|
|
@ -62,7 +62,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
|
|||
|
||||
/* all seems OK */
|
||||
part = add_partition(disk, partno, start, length,
|
||||
ADDPART_FLAG_NONE);
|
||||
ADDPART_FLAG_NONE, NULL);
|
||||
mutex_unlock(&bdev->bd_mutex);
|
||||
return IS_ERR(part) ? PTR_ERR(part) : 0;
|
||||
case BLKPG_DEL_PARTITION:
|
||||
|
|
|
@ -352,6 +352,7 @@ static void part_release(struct device *dev)
|
|||
{
|
||||
struct hd_struct *p = dev_to_part(dev);
|
||||
free_part_stats(p);
|
||||
free_part_info(p);
|
||||
kfree(p);
|
||||
}
|
||||
|
||||
|
@ -401,7 +402,8 @@ static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
|
|||
whole_disk_show, NULL);
|
||||
|
||||
struct hd_struct *add_partition(struct gendisk *disk, int partno,
|
||||
sector_t start, sector_t len, int flags)
|
||||
sector_t start, sector_t len, int flags,
|
||||
struct partition_meta_info *info)
|
||||
{
|
||||
struct hd_struct *p;
|
||||
dev_t devt = MKDEV(0, 0);
|
||||
|
@ -438,6 +440,14 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno,
|
|||
p->partno = partno;
|
||||
p->policy = get_disk_ro(disk);
|
||||
|
||||
if (info) {
|
||||
struct partition_meta_info *pinfo = alloc_part_info(disk);
|
||||
if (!pinfo)
|
||||
goto out_free_stats;
|
||||
memcpy(pinfo, info, sizeof(*info));
|
||||
p->info = pinfo;
|
||||
}
|
||||
|
||||
dname = dev_name(ddev);
|
||||
if (isdigit(dname[strlen(dname) - 1]))
|
||||
dev_set_name(pdev, "%sp%d", dname, partno);
|
||||
|
@ -451,7 +461,7 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno,
|
|||
|
||||
err = blk_alloc_devt(p, &devt);
|
||||
if (err)
|
||||
goto out_free_stats;
|
||||
goto out_free_info;
|
||||
pdev->devt = devt;
|
||||
|
||||
/* delay uevent until 'holders' subdir is created */
|
||||
|
@ -481,6 +491,8 @@ struct hd_struct *add_partition(struct gendisk *disk, int partno,
|
|||
|
||||
return p;
|
||||
|
||||
out_free_info:
|
||||
free_part_info(p);
|
||||
out_free_stats:
|
||||
free_part_stats(p);
|
||||
out_free:
|
||||
|
@ -642,6 +654,7 @@ rescan:
|
|||
/* add partitions */
|
||||
for (p = 1; p < state->limit; p++) {
|
||||
sector_t size, from;
|
||||
struct partition_meta_info *info = NULL;
|
||||
|
||||
size = state->parts[p].size;
|
||||
if (!size)
|
||||
|
@ -675,8 +688,12 @@ rescan:
|
|||
size = get_capacity(disk) - from;
|
||||
}
|
||||
}
|
||||
|
||||
if (state->parts[p].has_info)
|
||||
info = &state->parts[p].info;
|
||||
part = add_partition(disk, p, from, size,
|
||||
state->parts[p].flags);
|
||||
state->parts[p].flags,
|
||||
&state->parts[p].info);
|
||||
if (IS_ERR(part)) {
|
||||
printk(KERN_ERR " %s: p%d could not be added: %ld\n",
|
||||
disk->disk_name, p, -PTR_ERR(part));
|
||||
|
|
|
@ -1,5 +1,6 @@
|
|||
#include <linux/pagemap.h>
|
||||
#include <linux/blkdev.h>
|
||||
#include <linux/genhd.h>
|
||||
|
||||
/*
|
||||
* add_gd_partition adds a partitions details to the devices partition
|
||||
|
@ -12,6 +13,8 @@ struct parsed_partitions {
|
|||
sector_t from;
|
||||
sector_t size;
|
||||
int flags;
|
||||
bool has_info;
|
||||
struct partition_meta_info info;
|
||||
} parts[DISK_MAX_PARTS];
|
||||
int next;
|
||||
int limit;
|
||||
|
|
|
@ -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);
|
||||
|
||||
|
|
Загрузка…
Ссылка в новой задаче