Btrfs: use a separate flag for search_start vs a hint in find_free_extent
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
David Woodhouse
Родитель
1e2677e000
Коммит
fbdc762b4e
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@ -5,8 +5,9 @@
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#include "transaction.h"
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static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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*orig_root, u64 num_blocks, u64 search_start, u64
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search_end, struct btrfs_key *ins, int data);
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*orig_root, u64 num_blocks, u64 search_start,
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u64 search_end, u64 hint_block,
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struct btrfs_key *ins, int data);
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static int finish_current_insert(struct btrfs_trans_handle *trans, struct
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btrfs_root *extent_root);
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static int del_pending_extents(struct btrfs_trans_handle *trans, struct
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@ -157,12 +158,6 @@ static struct btrfs_block_group_cache *lookup_block_group(struct
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block_group->key.objectid + block_group->key.offset)
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return block_group;
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}
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WARN_ON(1);
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printk("lookup_block_group fails for blocknr %Lu\n", blocknr);
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printk("last ret was %d\n", ret);
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if (ret) {
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printk("last block group was %Lu %Lu\n", block_group->key.objectid, block_group->key.offset);
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}
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return NULL;
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}
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@ -378,7 +373,7 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
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struct btrfs_key ins;
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u32 refs;
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find_free_extent(trans, root->fs_info->extent_root, 0, 0, (u64)-1,
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find_free_extent(trans, root->fs_info->extent_root, 0, 0, (u64)-1, 0,
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&ins, 0);
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path = btrfs_alloc_path();
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BUG_ON(!path);
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@ -495,7 +490,7 @@ static int write_one_cache_group(struct btrfs_trans_handle *trans,
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struct btrfs_block_group_item *bi;
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struct btrfs_key ins;
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find_free_extent(trans, extent_root, 0, 0, (u64)-1, &ins, 0);
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find_free_extent(trans, extent_root, 0, 0, (u64)-1, 0, &ins, 0);
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ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1);
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BUG_ON(ret);
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bi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
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@ -788,7 +783,7 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
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key.offset = num_blocks;
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find_free_extent(trans, root, 0, 0, (u64)-1, &ins, 0);
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find_free_extent(trans, root, 0, 0, (u64)-1, 0, &ins, 0);
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path = btrfs_alloc_path();
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BUG_ON(!path);
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btrfs_init_path(path);
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@ -906,7 +901,8 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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*/
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static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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*orig_root, u64 num_blocks, u64 search_start, u64
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search_end, struct btrfs_key *ins, int data)
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search_end, u64 hint_block,
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struct btrfs_key *ins, int data)
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{
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struct btrfs_path *path;
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struct btrfs_key key;
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@ -926,6 +922,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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int level;
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struct btrfs_block_group_cache *block_group;
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int full_scan = 0;
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int wrapped = 0;
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u64 limit;
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path = btrfs_alloc_path();
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@ -940,10 +937,10 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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}
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if (search_end == (u64)-1)
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search_end = btrfs_super_total_blocks(info->disk_super);
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if (search_start) {
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block_group = lookup_block_group(info, search_start);
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if (hint_block) {
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block_group = lookup_block_group(info, hint_block);
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block_group = btrfs_find_block_group(root, block_group,
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search_start, data, 1);
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hint_block, data, 1);
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} else {
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block_group = btrfs_find_block_group(root,
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trans->block_group, 0,
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@ -954,7 +951,7 @@ check_failed:
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if (!block_group->data)
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search_start = find_search_start(root, &block_group,
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search_start, total_needed);
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else
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else if (!full_scan)
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search_start = max(block_group->last_alloc, search_start);
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btrfs_init_path(path);
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@ -1039,7 +1036,7 @@ check_failed:
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start_found = 1;
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last_block = key.objectid + key.offset;
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if (last_block >= block_group->key.objectid +
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if (!full_scan && last_block >= block_group->key.objectid +
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block_group->key.offset) {
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btrfs_release_path(root, path);
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search_start = block_group->key.objectid +
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@ -1059,10 +1056,15 @@ check_pending:
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BUG_ON(ins->objectid < search_start);
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if (ins->objectid + num_blocks >= search_end) {
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if (full_scan)
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return -ENOSPC;
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if (full_scan) {
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ret = -ENOSPC;
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goto error;
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}
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search_start = orig_search_start;
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full_scan = 1;
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if (wrapped)
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full_scan = 1;
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else
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wrapped = 1;
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goto new_group;
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}
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for (test_block = ins->objectid;
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@ -1132,14 +1134,20 @@ check_pending:
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new_group:
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if (search_start + num_blocks >= search_end) {
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search_start = orig_search_start;
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printk("doing full scan!\n");
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full_scan = 1;
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if (full_scan) {
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ret = -ENOSPC;
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goto error;
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}
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if (wrapped)
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full_scan = 1;
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else
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wrapped = 1;
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}
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block_group = lookup_block_group(info, search_start);
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cond_resched();
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if (!full_scan)
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block_group = btrfs_find_block_group(root, block_group,
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search_start, data, 0);
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cond_resched();
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goto check_failed;
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error:
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@ -1156,12 +1164,13 @@ error:
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*/
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int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 owner,
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u64 num_blocks, u64 search_start,
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u64 num_blocks, u64 hint_block,
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u64 search_end, struct btrfs_key *ins, int data)
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{
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int ret;
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int pending_ret;
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u64 super_blocks_used;
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u64 search_start = 0;
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struct btrfs_fs_info *info = root->fs_info;
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struct btrfs_root *extent_root = info->extent_root;
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struct btrfs_extent_item extent_item;
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@ -1193,7 +1202,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
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*/
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if (data) {
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ret = find_free_extent(trans, root, 0, 0,
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search_end, &prealloc_key, 0);
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search_end, 0, &prealloc_key, 0);
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if (ret) {
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return ret;
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}
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@ -1204,9 +1213,11 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
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search_start = info->extent_tree_prealloc[0] + 1;
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}
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}
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if (hint_block < search_start)
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hint_block = search_start;
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/* do the real allocation */
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ret = find_free_extent(trans, root, num_blocks, search_start,
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search_end, ins, data);
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search_end, hint_block, ins, data);
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if (ret) {
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return ret;
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}
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@ -1226,8 +1237,12 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
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else
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search_start = ins->objectid + ins->offset;
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if (hint_block < search_start)
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hint_block = search_start;
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ret = find_free_extent(trans, root, 0, search_start,
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search_end, &prealloc_key, 0);
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search_end, hint_block,
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&prealloc_key, 0);
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if (ret) {
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return ret;
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}
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