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Implement raid0 when multiple devices are present 

This defaults to striping across all devices
master
Chris Mason 2008-03-25 16:50:20 -04:00 committed by David Woodhouse
parent 0dcfa3b827
commit e9e3422f85
3 changed files with 147 additions and 63 deletions
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1
ctree.h
View File

@ -402,6 +402,7 @@ struct btrfs_csum_item {
#define BTRFS_BLOCK_GROUP_DATA (1 << 0)
#define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
#define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
#define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
struct btrfs_block_group_item {
__le64 used;

77
extent-tree.c
View File

@ -989,6 +989,35 @@ static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
}
static int update_space_info(struct btrfs_fs_info *info, u64 flags,
u64 total_bytes, u64 bytes_used,
struct btrfs_space_info **space_info)
{
struct btrfs_space_info *found;
found = __find_space_info(info, flags);
if (found) {
found->total_bytes += total_bytes;
found->bytes_used += bytes_used;
WARN_ON(found->total_bytes < found->bytes_used);
*space_info = found;
return 0;
}
found = kmalloc(sizeof(*found), GFP_NOFS);
if (!found)
return -ENOMEM;
list_add(&found->list, &info->space_info);
found->flags = flags;
found->total_bytes = total_bytes;
found->bytes_used = bytes_used;
found->bytes_pinned = 0;
found->full = 0;
*space_info = found;
return 0;
}
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 alloc_bytes,
u64 flags)
@ -1000,6 +1029,11 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
int ret;
space_info = __find_space_info(extent_root->fs_info, flags);
if (!space_info) {
ret = update_space_info(extent_root->fs_info, flags,
0, 0, &space_info);
BUG_ON(ret);
}
BUG_ON(!space_info);
if (space_info->full)
@ -1579,25 +1613,30 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
struct btrfs_extent_item *extent_item;
struct btrfs_extent_ref *ref;
struct btrfs_key keys[2];
int extra_alloc_flags = 0;
if (btrfs_super_num_devices(&info->super_copy) > 1)
extra_alloc_flags = BTRFS_BLOCK_GROUP_RAID0;
if (data) {
data = BTRFS_BLOCK_GROUP_DATA;
data = BTRFS_BLOCK_GROUP_DATA | extra_alloc_flags;
} else if (root == root->fs_info->chunk_root ||
info->force_system_allocs) {
data = BTRFS_BLOCK_GROUP_SYSTEM;
} else {
data = BTRFS_BLOCK_GROUP_METADATA;
data = BTRFS_BLOCK_GROUP_METADATA | extra_alloc_flags;
}
if (root->ref_cows) {
if (data != BTRFS_BLOCK_GROUP_METADATA) {
if (!(data & BTRFS_BLOCK_GROUP_METADATA)) {
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
num_bytes,
BTRFS_BLOCK_GROUP_METADATA);
BTRFS_BLOCK_GROUP_METADATA |
extra_alloc_flags);
BUG_ON(ret);
}
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
num_bytes, data);
num_bytes + 2 * 1024 * 1024, data);
BUG_ON(ret);
}
@ -2143,34 +2182,6 @@ error:
return ret;
}
static int update_space_info(struct btrfs_fs_info *info, u64 flags,
u64 total_bytes, u64 bytes_used,
struct btrfs_space_info **space_info)
{
struct btrfs_space_info *found;
found = __find_space_info(info, flags);
if (found) {
found->total_bytes += total_bytes;
found->bytes_used += bytes_used;
WARN_ON(found->total_bytes < found->bytes_used);
*space_info = found;
return 0;
}
found = kmalloc(sizeof(*found), GFP_NOFS);
if (!found)
return -ENOMEM;
list_add(&found->list, &info->space_info);
found->flags = flags;
found->total_bytes = total_bytes;
found->bytes_used = bytes_used;
found->bytes_pinned = 0;
found->full = 0;
*space_info = found;
return 0;
}
int btrfs_read_block_groups(struct btrfs_root *root)
{
struct btrfs_path *path;

132
volumes.c
View File

@ -30,11 +30,25 @@
#include "print-tree.h"
#include "volumes.h"
struct map_lookup {
struct cache_extent ce;
struct stripe {
struct btrfs_device *dev;
u64 physical;
};
struct map_lookup {
struct cache_extent ce;
u64 type;
int io_align;
int io_width;
int stripe_len;
int sector_size;
int num_stripes;
struct stripe stripes[];
};
#define map_lookup_size(n) (sizeof(struct map_lookup) + \
(sizeof(struct stripe) * (n)))
static LIST_HEAD(fs_uuids);
static struct btrfs_device *__find_device(struct list_head *head, u64 devid)
@ -540,6 +554,7 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
u64 *num_bytes, u64 type)
{
u64 dev_offset;
struct btrfs_fs_info *info = extent_root->fs_info;
struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
struct btrfs_stripe *stripes;
struct btrfs_device *device = NULL;
@ -549,17 +564,25 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct list_head *cur;
struct map_lookup *map;
u64 physical;
u64 calc_size = 128 * 1024 * 1024;
u64 calc_size = 8 * 1024 * 1024;
u64 avail;
u64 max_avail = 0;
int num_stripes = 1;
int looped = 0;
int ret;
int index;
int stripe_len = 64 * 1024;
struct btrfs_key key;
if (list_empty(dev_list))
return -ENOSPC;
if (type & BTRFS_BLOCK_GROUP_RAID0)
num_stripes = btrfs_super_num_devices(&info->super_copy);
if (type & BTRFS_BLOCK_GROUP_DATA)
stripe_len = 64 * 1024;
if (type & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM))
stripe_len = 32 * 1024;
again:
INIT_LIST_HEAD(&private_devs);
cur = dev_list->next;
@ -596,9 +619,15 @@ again:
if (!chunk)
return -ENOMEM;
map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
if (!map) {
kfree(chunk);
return -ENOMEM;
}
stripes = &chunk->stripe;
*num_bytes = calc_size;
*num_bytes = calc_size * num_stripes;
index = 0;
while(index < num_stripes) {
BUG_ON(list_empty(&private_devs));
@ -615,6 +644,8 @@ printk("alloc chunk size %Lu from dev %Lu\n", calc_size, device->devid);
ret = btrfs_update_device(trans, device);
BUG_ON(ret);
map->stripes[index].dev = device;
map->stripes[index].physical = dev_offset;
btrfs_set_stack_stripe_devid(stripes + index, device->devid);
btrfs_set_stack_stripe_offset(stripes + index, dev_offset);
physical = dev_offset;
@ -626,32 +657,27 @@ printk("alloc chunk size %Lu from dev %Lu\n", calc_size, device->devid);
key.offset = *num_bytes;
key.type = BTRFS_CHUNK_ITEM_KEY;
btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid);
btrfs_set_stack_chunk_stripe_len(chunk, 64 * 1024);
btrfs_set_stack_chunk_stripe_len(chunk, stripe_len);
btrfs_set_stack_chunk_type(chunk, type);
btrfs_set_stack_chunk_num_stripes(chunk, num_stripes);
btrfs_set_stack_chunk_io_align(chunk, extent_root->sectorsize);
btrfs_set_stack_chunk_io_width(chunk, extent_root->sectorsize);
btrfs_set_stack_chunk_io_align(chunk, stripe_len);
btrfs_set_stack_chunk_io_width(chunk, stripe_len);
btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize);
map->sector_size = extent_root->sectorsize;
map->stripe_len = stripe_len;
map->io_align = stripe_len;
map->io_width = stripe_len;
map->type = type;
map->num_stripes = num_stripes;
ret = btrfs_insert_item(trans, chunk_root, &key, chunk,
btrfs_chunk_item_size(num_stripes));
BUG_ON(ret);
*start = key.objectid;
map = kmalloc(sizeof(*map), GFP_NOFS);
if (!map)
return -ENOMEM;
map->ce.start = key.objectid;
map->ce.size = key.offset;
map->physical = physical;
map->dev = device;
if (!map->dev) {
kfree(map);
return -EIO;
}
ret = insert_existing_cache_extent(
&extent_root->fs_info->mapping_tree.cache_tree,
&map->ce);
@ -673,15 +699,50 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
struct cache_extent *ce;
struct map_lookup *map;
u64 offset;
u64 stripe_offset;
u64 stripe_nr;
int stripe_index;
ce = find_first_cache_extent(&map_tree->cache_tree, logical);
BUG_ON(!ce);
BUG_ON(ce->start > logical || ce->start + ce->size < logical);
map = container_of(ce, struct map_lookup, ce);
offset = logical - ce->start;
*phys = map->physical + offset;
*length = ce->size - offset;
*dev = map->dev;
stripe_nr = offset;
/*
* stripe_nr counts the total number of stripes we have to stride
* to get to this block
*/
stripe_nr = stripe_nr / map->stripe_len;
stripe_offset = stripe_nr * map->stripe_len;
BUG_ON(offset < stripe_offset);
/* stripe_offset is the offset of this block in its stripe*/
stripe_offset = offset - stripe_offset;
/*
* after this do_div call, stripe_nr is the number of stripes
* on this device we have to walk to find the data, and
* stripe_index is the number of our device in the stripe array
*/
stripe_index = stripe_nr % map->num_stripes;
stripe_nr = stripe_nr / map->num_stripes;
BUG_ON(stripe_index >= map->num_stripes);
*phys = map->stripes[stripe_index].physical + stripe_offset +
stripe_nr * map->stripe_len;
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
/* we limit the length of each bio to what fits in a stripe */
*length = min_t(u64, ce->size - offset,
map->stripe_len - stripe_offset);
} else {
*length = ce->size - offset;
}
*dev = map->stripes[stripe_index].dev;
return 0;
}
@ -702,7 +763,9 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
u64 logical;
u64 length;
u64 devid;
int num_stripes;
int ret;
int i;
logical = key->objectid;
length = key->offset;
@ -713,21 +776,30 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
return 0;
}
map = kmalloc(sizeof(*map), GFP_NOFS);
num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
if (!map)
return -ENOMEM;
map->ce.start = logical;
map->ce.size = length;
map->physical = btrfs_stripe_offset_nr(leaf, chunk, 0);
map->num_stripes = num_stripes;
map->io_width = btrfs_chunk_io_width(leaf, chunk);
map->io_align = btrfs_chunk_io_align(leaf, chunk);
map->sector_size = btrfs_chunk_sector_size(leaf, chunk);
map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
map->type = btrfs_chunk_type(leaf, chunk);
for (i = 0; i < num_stripes; i++) {
map->stripes[i].physical =
btrfs_stripe_offset_nr(leaf, chunk, i);
devid = btrfs_stripe_devid_nr(leaf, chunk, i);
map->stripes[i].dev = btrfs_find_device(root, devid);
if (!map->stripes[i].dev) {
kfree(map);
return -EIO;
}
devid = btrfs_stripe_devid_nr(leaf, chunk, 0);
map->dev = btrfs_find_device(root, devid);
if (!map->dev) {
kfree(map);
return -EIO;
}
ret = insert_existing_cache_extent(&map_tree->cache_tree, &map->ce);
BUG_ON(ret);
@ -761,7 +833,7 @@ static int read_one_dev(struct btrfs_root *root,
{
struct btrfs_device *device;
u64 devid;
int ret;
int ret = 0;
devid = btrfs_device_id(leaf, dev_item);
device = btrfs_find_device(root, devid);