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Change btrfs_map_block to return a structure with mappings for all stripes

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-09 16:28:12 -04:00
parent d18a2c4475
commit cea9e4452e
4 changed files with 102 additions and 68 deletions
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25
fs/btrfs/volumes.h
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@@ -19,6 +19,8 @@
#ifndef __BTRFS_VOLUMES_
#define __BTRFS_VOLUMES_
#include <linux/bio.h>
struct btrfs_device {
struct list_head dev_list;
struct btrfs_root *dev_root;
@@ -69,12 +71,29 @@ struct btrfs_fs_devices {
struct list_head list;
};
struct btrfs_bio_stripe {
struct btrfs_device *dev;
u64 physical;
};
struct btrfs_multi_bio {
atomic_t stripes_pending;
bio_end_io_t *end_io;
void *private;
int error;
int num_stripes;
struct btrfs_bio_stripe stripes[];
};
#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
(sizeof(struct btrfs_bio_stripe) * (n)))
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
u64 owner, u64 num_bytes, u64 *start);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, int stripe_nr,
u64 logical, u64 *phys, u64 *length,
struct btrfs_device **dev, int *total_stripes);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
u64 logical, u64 *length,
struct btrfs_multi_bio **multi_ret);
int btrfs_read_sys_array(struct btrfs_root *root);
int btrfs_read_chunk_tree(struct btrfs_root *root);
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,