Btrfs: Implement raid0 when multiple devices are present
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
parent
8a4b83cc8b
commit
593060d756
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@ -413,6 +413,7 @@ struct btrfs_csum_item {
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#define BTRFS_BLOCK_GROUP_DATA (1 << 0)
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#define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
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#define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
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#define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
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struct btrfs_block_group_item {
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@ -498,6 +499,8 @@ struct btrfs_fs_info {
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u64 delalloc_bytes;
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u64 last_alloc;
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u64 last_data_alloc;
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int extra_data_alloc_bits;
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int extra_alloc_bits;
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};
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/*
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@ -736,6 +736,8 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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fs_info->total_pinned = 0;
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fs_info->last_alloc = 0;
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fs_info->last_data_alloc = 0;
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fs_info->extra_alloc_bits = 0;
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fs_info->extra_data_alloc_bits = 0;
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#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
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INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
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@ -172,7 +172,7 @@ struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
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static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits)
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{
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return (cache->flags & bits);
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return (cache->flags & bits) == bits;
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}
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static int noinline find_search_start(struct btrfs_root *root,
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@ -1010,6 +1010,35 @@ static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
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}
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static int update_space_info(struct btrfs_fs_info *info, u64 flags,
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u64 total_bytes, u64 bytes_used,
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struct btrfs_space_info **space_info)
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{
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struct btrfs_space_info *found;
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found = __find_space_info(info, flags);
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if (found) {
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found->total_bytes += total_bytes;
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found->bytes_used += bytes_used;
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WARN_ON(found->total_bytes < found->bytes_used);
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*space_info = found;
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return 0;
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}
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found = kmalloc(sizeof(*found), GFP_NOFS);
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if (!found)
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return -ENOMEM;
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list_add(&found->list, &info->space_info);
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found->flags = flags;
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found->total_bytes = total_bytes;
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found->bytes_used = bytes_used;
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found->bytes_pinned = 0;
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found->full = 0;
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*space_info = found;
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return 0;
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}
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static int do_chunk_alloc(struct btrfs_trans_handle *trans,
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struct btrfs_root *extent_root, u64 alloc_bytes,
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u64 flags)
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@ -1021,6 +1050,11 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
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int ret;
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space_info = __find_space_info(extent_root->fs_info, flags);
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if (!space_info) {
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ret = update_space_info(extent_root->fs_info, flags,
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0, 0, &space_info);
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BUG_ON(ret);
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}
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BUG_ON(!space_info);
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if (space_info->full)
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@ -1044,6 +1078,17 @@ printk("space info full %Lu\n", flags);
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extent_root->fs_info->chunk_root->root_key.objectid,
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start, num_bytes);
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BUG_ON(ret);
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if (flags & BTRFS_BLOCK_GROUP_RAID0) {
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if (flags & BTRFS_BLOCK_GROUP_DATA) {
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extent_root->fs_info->extra_data_alloc_bits =
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BTRFS_BLOCK_GROUP_RAID0;
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}
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if (flags & BTRFS_BLOCK_GROUP_METADATA) {
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extent_root->fs_info->extra_alloc_bits =
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BTRFS_BLOCK_GROUP_RAID0;
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}
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}
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return 0;
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}
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@ -1655,24 +1700,31 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
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struct btrfs_extent_ref *ref;
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struct btrfs_path *path;
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struct btrfs_key keys[2];
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int extra_chunk_alloc_bits = 0;
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if (data) {
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data = BTRFS_BLOCK_GROUP_DATA;
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data = BTRFS_BLOCK_GROUP_DATA | info->extra_data_alloc_bits;
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} else if (root == root->fs_info->chunk_root) {
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data = BTRFS_BLOCK_GROUP_SYSTEM;
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} else {
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data = BTRFS_BLOCK_GROUP_METADATA;
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data = BTRFS_BLOCK_GROUP_METADATA | info->extra_alloc_bits;
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}
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if (btrfs_super_num_devices(&info->super_copy) > 1 &&
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!(data & BTRFS_BLOCK_GROUP_SYSTEM))
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extra_chunk_alloc_bits = BTRFS_BLOCK_GROUP_RAID0;
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if (root->ref_cows) {
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if (data != BTRFS_BLOCK_GROUP_METADATA) {
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if (!(data & BTRFS_BLOCK_GROUP_METADATA)) {
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ret = do_chunk_alloc(trans, root->fs_info->extent_root,
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2 * 1024 * 1024,
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BTRFS_BLOCK_GROUP_METADATA);
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BTRFS_BLOCK_GROUP_METADATA |
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info->extra_alloc_bits |
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extra_chunk_alloc_bits);
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BUG_ON(ret);
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}
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ret = do_chunk_alloc(trans, root->fs_info->extent_root,
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num_bytes + 2 * 1024 * 1024, data);
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num_bytes + 2 * 1024 * 1024, data |
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extra_chunk_alloc_bits);
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BUG_ON(ret);
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}
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@ -2627,34 +2679,6 @@ error:
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return ret;
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}
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static int update_space_info(struct btrfs_fs_info *info, u64 flags,
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u64 total_bytes, u64 bytes_used,
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struct btrfs_space_info **space_info)
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{
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struct btrfs_space_info *found;
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found = __find_space_info(info, flags);
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if (found) {
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found->total_bytes += total_bytes;
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found->bytes_used += bytes_used;
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WARN_ON(found->total_bytes < found->bytes_used);
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*space_info = found;
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return 0;
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}
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found = kmalloc(sizeof(*found), GFP_NOFS);
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if (!found)
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return -ENOMEM;
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list_add(&found->list, &info->space_info);
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found->flags = flags;
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found->total_bytes = total_bytes;
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found->bytes_used = bytes_used;
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found->bytes_pinned = 0;
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found->full = 0;
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*space_info = found;
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return 0;
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}
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int btrfs_read_block_groups(struct btrfs_root *root)
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{
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struct btrfs_path *path;
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@ -2712,6 +2736,16 @@ int btrfs_read_block_groups(struct btrfs_root *root)
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} else if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) {
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bit = BLOCK_GROUP_METADATA;
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}
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if (cache->flags & BTRFS_BLOCK_GROUP_RAID0) {
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if (cache->flags & BTRFS_BLOCK_GROUP_DATA) {
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info->extra_data_alloc_bits =
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BTRFS_BLOCK_GROUP_RAID0;
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}
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if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) {
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info->extra_alloc_bits =
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BTRFS_BLOCK_GROUP_RAID0;
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}
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}
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ret = update_space_info(info, cache->flags, found_key.offset,
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btrfs_block_group_used(&cache->item),
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@ -317,8 +317,6 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
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map_length = length;
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ret = btrfs_map_block(map_tree, logical, &physical, &map_length, &dev);
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if (map_length < length + size) {
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printk("merge bio hook logical %Lu bio len %Lu physical %Lu "
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"len %Lu\n", logical, length, physical, map_length);
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return 1;
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}
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return 0;
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@ -18,6 +18,7 @@
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#include <linux/sched.h>
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#include <linux/bio.h>
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#include <linux/buffer_head.h>
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#include <asm/div64.h>
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#include "ctree.h"
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#include "extent_map.h"
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#include "disk-io.h"
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@ -25,10 +26,24 @@
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#include "print-tree.h"
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#include "volumes.h"
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struct map_lookup {
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struct stripe {
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struct btrfs_device *dev;
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u64 physical;
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};
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struct map_lookup {
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u64 type;
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int io_align;
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int io_width;
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int stripe_len;
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int sector_size;
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int num_stripes;
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struct stripe stripes[];
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};
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#define map_lookup_size(n) (sizeof(struct map_lookup) + \
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(sizeof(struct stripe) * (n)))
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static DEFINE_MUTEX(uuid_mutex);
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static LIST_HEAD(fs_uuids);
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@ -592,6 +607,7 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
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u64 *num_bytes, u64 type)
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{
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u64 dev_offset;
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struct btrfs_fs_info *info = extent_root->fs_info;
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struct btrfs_root *chunk_root = extent_root->fs_info->chunk_root;
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struct btrfs_stripe *stripes;
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struct btrfs_device *device = NULL;
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@ -610,10 +626,18 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
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int looped = 0;
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int ret;
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int index;
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int stripe_len = 64 * 1024;
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struct btrfs_key key;
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if (list_empty(dev_list))
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return -ENOSPC;
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if (type & BTRFS_BLOCK_GROUP_RAID0)
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num_stripes = btrfs_super_num_devices(&info->super_copy);
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if (type & BTRFS_BLOCK_GROUP_DATA)
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stripe_len = 64 * 1024;
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if (type & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM))
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stripe_len = 32 * 1024;
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again:
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INIT_LIST_HEAD(&private_devs);
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cur = dev_list->next;
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@ -650,9 +674,15 @@ again:
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if (!chunk)
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return -ENOMEM;
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map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
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if (!map) {
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kfree(chunk);
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return -ENOMEM;
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}
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stripes = &chunk->stripe;
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*num_bytes = calc_size;
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*num_bytes = calc_size * num_stripes;
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index = 0;
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while(index < num_stripes) {
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BUG_ON(list_empty(&private_devs));
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@ -669,6 +699,8 @@ printk("alloc chunk size %Lu from dev %Lu\n", calc_size, device->devid);
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ret = btrfs_update_device(trans, device);
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BUG_ON(ret);
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map->stripes[index].dev = device;
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map->stripes[index].physical = dev_offset;
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btrfs_set_stack_stripe_devid(stripes + index, device->devid);
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btrfs_set_stack_stripe_offset(stripes + index, dev_offset);
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physical = dev_offset;
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@ -680,12 +712,18 @@ printk("alloc chunk size %Lu from dev %Lu\n", calc_size, device->devid);
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key.offset = *num_bytes;
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key.type = BTRFS_CHUNK_ITEM_KEY;
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btrfs_set_stack_chunk_owner(chunk, extent_root->root_key.objectid);
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btrfs_set_stack_chunk_stripe_len(chunk, 64 * 1024);
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btrfs_set_stack_chunk_stripe_len(chunk, stripe_len);
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btrfs_set_stack_chunk_type(chunk, type);
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btrfs_set_stack_chunk_num_stripes(chunk, num_stripes);
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btrfs_set_stack_chunk_io_align(chunk, extent_root->sectorsize);
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btrfs_set_stack_chunk_io_width(chunk, extent_root->sectorsize);
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btrfs_set_stack_chunk_io_align(chunk, stripe_len);
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btrfs_set_stack_chunk_io_width(chunk, stripe_len);
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btrfs_set_stack_chunk_sector_size(chunk, extent_root->sectorsize);
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map->sector_size = extent_root->sectorsize;
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map->stripe_len = stripe_len;
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map->io_align = stripe_len;
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map->io_width = stripe_len;
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map->type = type;
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map->num_stripes = num_stripes;
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ret = btrfs_insert_item(trans, chunk_root, &key, chunk,
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btrfs_chunk_item_size(num_stripes));
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@ -695,25 +733,11 @@ printk("alloc chunk size %Lu from dev %Lu\n", calc_size, device->devid);
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em = alloc_extent_map(GFP_NOFS);
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if (!em)
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return -ENOMEM;
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map = kmalloc(sizeof(*map), GFP_NOFS);
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if (!map) {
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free_extent_map(em);
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return -ENOMEM;
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}
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em->bdev = (struct block_device *)map;
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em->start = key.objectid;
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em->len = key.offset;
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em->block_start = 0;
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map->physical = physical;
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map->dev = device;
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if (!map->dev) {
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kfree(map);
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free_extent_map(em);
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return -EIO;
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}
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kfree(chunk);
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em_tree = &extent_root->fs_info->mapping_tree.map_tree;
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@ -758,6 +782,9 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
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struct map_lookup *map;
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struct extent_map_tree *em_tree = &map_tree->map_tree;
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u64 offset;
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u64 stripe_offset;
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u64 stripe_nr;
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int stripe_index;
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spin_lock(&em_tree->lock);
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@ -767,9 +794,40 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
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BUG_ON(em->start > logical || em->start + em->len < logical);
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map = (struct map_lookup *)em->bdev;
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offset = logical - em->start;
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*phys = map->physical + offset;
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*length = em->len - offset;
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*dev = map->dev;
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stripe_nr = offset;
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/*
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* stripe_nr counts the total number of stripes we have to stride
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* to get to this block
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*/
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do_div(stripe_nr, map->stripe_len);
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stripe_offset = stripe_nr * map->stripe_len;
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BUG_ON(offset < stripe_offset);
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/* stripe_offset is the offset of this block in its stripe*/
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stripe_offset = offset - stripe_offset;
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/*
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* after this do_div call, stripe_nr is the number of stripes
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* on this device we have to walk to find the data, and
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* stripe_index is the number of our device in the stripe array
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*/
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stripe_index = do_div(stripe_nr, map->num_stripes);
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BUG_ON(stripe_index >= map->num_stripes);
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*phys = map->stripes[stripe_index].physical + stripe_offset +
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stripe_nr * map->stripe_len;
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if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
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/* we limit the length of each bio to what fits in a stripe */
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*length = min_t(u64, em->len - offset,
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map->stripe_len - stripe_offset);
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} else {
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*length = em->len - offset;
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}
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*dev = map->stripes[stripe_index].dev;
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free_extent_map(em);
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spin_unlock(&em_tree->lock);
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return 0;
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@ -822,7 +880,9 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
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u64 logical;
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u64 length;
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u64 devid;
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int num_stripes;
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int ret;
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int i;
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logical = key->objectid;
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length = key->offset;
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@ -846,7 +906,8 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
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em = alloc_extent_map(GFP_NOFS);
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if (!em)
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return -ENOMEM;
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map = kmalloc(sizeof(*map), GFP_NOFS);
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num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
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map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
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if (!map) {
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free_extent_map(em);
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return -ENOMEM;
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@ -857,13 +918,22 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
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em->len = length;
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em->block_start = 0;
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map->physical = btrfs_stripe_offset_nr(leaf, chunk, 0);
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devid = btrfs_stripe_devid_nr(leaf, chunk, 0);
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map->dev = btrfs_find_device(root, devid);
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if (!map->dev) {
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kfree(map);
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free_extent_map(em);
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return -EIO;
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map->num_stripes = num_stripes;
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map->io_width = btrfs_chunk_io_width(leaf, chunk);
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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);
|
||||
free_extent_map(em);
|
||||
return -EIO;
|
||||
}
|
||||
}
|
||||
|
||||
spin_lock(&map_tree->map_tree.lock);
|
||||
|
|
|
|||
Reference in New Issue