mirror of https://gitee.com/openkylin/linux.git
Btrfs: remove dead code
This patch removes a bunch of dead code from the snapshot removal stuff. It was confusing me when doing the metadata ENOSPC stuff so I killed it. Signed-off-by: Josef Bacik <jbacik@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Josef Bacik
Chris Mason
parent
f019f4264a
commit
f61408b81c
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@ -4462,430 +4462,6 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
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return buf;
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}
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#if 0
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int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, struct extent_buffer *leaf)
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{
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u64 disk_bytenr;
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u64 num_bytes;
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struct btrfs_key key;
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struct btrfs_file_extent_item *fi;
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u32 nritems;
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int i;
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int ret;
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BUG_ON(!btrfs_is_leaf(leaf));
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nritems = btrfs_header_nritems(leaf);
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for (i = 0; i < nritems; i++) {
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cond_resched();
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btrfs_item_key_to_cpu(leaf, &key, i);
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/* only extents have references, skip everything else */
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if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
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continue;
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fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
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/* inline extents live in the btree, they don't have refs */
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if (btrfs_file_extent_type(leaf, fi) ==
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BTRFS_FILE_EXTENT_INLINE)
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continue;
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disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
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/* holes don't have refs */
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if (disk_bytenr == 0)
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continue;
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num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
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ret = btrfs_free_extent(trans, root, disk_bytenr, num_bytes,
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leaf->start, 0, key.objectid, 0);
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BUG_ON(ret);
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}
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return 0;
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}
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static noinline int cache_drop_leaf_ref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_leaf_ref *ref)
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{
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int i;
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int ret;
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struct btrfs_extent_info *info;
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struct refsort *sorted;
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if (ref->nritems == 0)
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return 0;
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sorted = kmalloc(sizeof(*sorted) * ref->nritems, GFP_NOFS);
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for (i = 0; i < ref->nritems; i++) {
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sorted[i].bytenr = ref->extents[i].bytenr;
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sorted[i].slot = i;
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}
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sort(sorted, ref->nritems, sizeof(struct refsort), refsort_cmp, NULL);
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/*
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* the items in the ref were sorted when the ref was inserted
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* into the ref cache, so this is already in order
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*/
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for (i = 0; i < ref->nritems; i++) {
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info = ref->extents + sorted[i].slot;
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ret = btrfs_free_extent(trans, root, info->bytenr,
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info->num_bytes, ref->bytenr,
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ref->owner, ref->generation,
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info->objectid, 0);
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atomic_inc(&root->fs_info->throttle_gen);
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wake_up(&root->fs_info->transaction_throttle);
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cond_resched();
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BUG_ON(ret);
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info++;
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}
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kfree(sorted);
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return 0;
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}
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static int drop_snap_lookup_refcount(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 start,
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u64 len, u32 *refs)
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{
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int ret;
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ret = btrfs_lookup_extent_refs(trans, root, start, len, refs);
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BUG_ON(ret);
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#if 0 /* some debugging code in case we see problems here */
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/* if the refs count is one, it won't get increased again. But
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* if the ref count is > 1, someone may be decreasing it at
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* the same time we are.
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*/
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if (*refs != 1) {
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struct extent_buffer *eb = NULL;
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eb = btrfs_find_create_tree_block(root, start, len);
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if (eb)
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btrfs_tree_lock(eb);
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mutex_lock(&root->fs_info->alloc_mutex);
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ret = lookup_extent_ref(NULL, root, start, len, refs);
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BUG_ON(ret);
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mutex_unlock(&root->fs_info->alloc_mutex);
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if (eb) {
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btrfs_tree_unlock(eb);
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free_extent_buffer(eb);
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}
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if (*refs == 1) {
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printk(KERN_ERR "btrfs block %llu went down to one "
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"during drop_snap\n", (unsigned long long)start);
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}
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}
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#endif
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cond_resched();
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return ret;
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}
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/*
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* this is used while deleting old snapshots, and it drops the refs
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* on a whole subtree starting from a level 1 node.
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*
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* The idea is to sort all the leaf pointers, and then drop the
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* ref on all the leaves in order. Most of the time the leaves
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* will have ref cache entries, so no leaf IOs will be required to
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* find the extents they have references on.
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*
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* For each leaf, any references it has are also dropped in order
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*
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* This ends up dropping the references in something close to optimal
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* order for reading and modifying the extent allocation tree.
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*/
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static noinline int drop_level_one_refs(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path)
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{
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u64 bytenr;
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u64 root_owner;
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u64 root_gen;
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struct extent_buffer *eb = path->nodes[1];
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struct extent_buffer *leaf;
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struct btrfs_leaf_ref *ref;
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struct refsort *sorted = NULL;
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int nritems = btrfs_header_nritems(eb);
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int ret;
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int i;
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int refi = 0;
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int slot = path->slots[1];
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u32 blocksize = btrfs_level_size(root, 0);
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u32 refs;
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if (nritems == 0)
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goto out;
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root_owner = btrfs_header_owner(eb);
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root_gen = btrfs_header_generation(eb);
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sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS);
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/*
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* step one, sort all the leaf pointers so we don't scribble
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* randomly into the extent allocation tree
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*/
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for (i = slot; i < nritems; i++) {
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sorted[refi].bytenr = btrfs_node_blockptr(eb, i);
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sorted[refi].slot = i;
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refi++;
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}
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/*
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* nritems won't be zero, but if we're picking up drop_snapshot
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* after a crash, slot might be > 0, so double check things
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* just in case.
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*/
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if (refi == 0)
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goto out;
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sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL);
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/*
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* the first loop frees everything the leaves point to
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*/
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for (i = 0; i < refi; i++) {
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u64 ptr_gen;
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bytenr = sorted[i].bytenr;
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/*
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* check the reference count on this leaf. If it is > 1
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* we just decrement it below and don't update any
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* of the refs the leaf points to.
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*/
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ret = drop_snap_lookup_refcount(trans, root, bytenr,
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blocksize, &refs);
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BUG_ON(ret);
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if (refs != 1)
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continue;
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ptr_gen = btrfs_node_ptr_generation(eb, sorted[i].slot);
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/*
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* the leaf only had one reference, which means the
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* only thing pointing to this leaf is the snapshot
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* we're deleting. It isn't possible for the reference
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* count to increase again later
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*
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* The reference cache is checked for the leaf,
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* and if found we'll be able to drop any refs held by
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* the leaf without needing to read it in.
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*/
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ref = btrfs_lookup_leaf_ref(root, bytenr);
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if (ref && ref->generation != ptr_gen) {
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btrfs_free_leaf_ref(root, ref);
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ref = NULL;
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}
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if (ref) {
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ret = cache_drop_leaf_ref(trans, root, ref);
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BUG_ON(ret);
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btrfs_remove_leaf_ref(root, ref);
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btrfs_free_leaf_ref(root, ref);
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} else {
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/*
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* the leaf wasn't in the reference cache, so
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* we have to read it.
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*/
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leaf = read_tree_block(root, bytenr, blocksize,
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ptr_gen);
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ret = btrfs_drop_leaf_ref(trans, root, leaf);
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BUG_ON(ret);
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free_extent_buffer(leaf);
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}
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atomic_inc(&root->fs_info->throttle_gen);
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wake_up(&root->fs_info->transaction_throttle);
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cond_resched();
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}
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/*
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* run through the loop again to free the refs on the leaves.
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* This is faster than doing it in the loop above because
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* the leaves are likely to be clustered together. We end up
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* working in nice chunks on the extent allocation tree.
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*/
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for (i = 0; i < refi; i++) {
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bytenr = sorted[i].bytenr;
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ret = btrfs_free_extent(trans, root, bytenr,
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blocksize, eb->start,
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root_owner, root_gen, 0, 1);
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BUG_ON(ret);
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atomic_inc(&root->fs_info->throttle_gen);
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wake_up(&root->fs_info->transaction_throttle);
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cond_resched();
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}
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out:
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kfree(sorted);
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/*
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* update the path to show we've processed the entire level 1
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* node. This will get saved into the root's drop_snapshot_progress
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* field so these drops are not repeated again if this transaction
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* commits.
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*/
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path->slots[1] = nritems;
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return 0;
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}
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/*
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* helper function for drop_snapshot, this walks down the tree dropping ref
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* counts as it goes.
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*/
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static noinline int walk_down_tree(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path, int *level)
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{
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u64 root_owner;
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u64 root_gen;
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u64 bytenr;
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u64 ptr_gen;
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struct extent_buffer *next;
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struct extent_buffer *cur;
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struct extent_buffer *parent;
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u32 blocksize;
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int ret;
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u32 refs;
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WARN_ON(*level < 0);
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WARN_ON(*level >= BTRFS_MAX_LEVEL);
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ret = drop_snap_lookup_refcount(trans, root, path->nodes[*level]->start,
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path->nodes[*level]->len, &refs);
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BUG_ON(ret);
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if (refs > 1)
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goto out;
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/*
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* walk down to the last node level and free all the leaves
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*/
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while (*level >= 0) {
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WARN_ON(*level < 0);
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WARN_ON(*level >= BTRFS_MAX_LEVEL);
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cur = path->nodes[*level];
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if (btrfs_header_level(cur) != *level)
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WARN_ON(1);
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if (path->slots[*level] >=
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btrfs_header_nritems(cur))
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break;
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/* the new code goes down to level 1 and does all the
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* leaves pointed to that node in bulk. So, this check
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* for level 0 will always be false.
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*
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* But, the disk format allows the drop_snapshot_progress
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* field in the root to leave things in a state where
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* a leaf will need cleaning up here. If someone crashes
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* with the old code and then boots with the new code,
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* we might find a leaf here.
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*/
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if (*level == 0) {
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ret = btrfs_drop_leaf_ref(trans, root, cur);
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BUG_ON(ret);
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break;
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}
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/*
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* once we get to level one, process the whole node
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* at once, including everything below it.
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*/
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if (*level == 1) {
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ret = drop_level_one_refs(trans, root, path);
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BUG_ON(ret);
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break;
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}
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bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
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ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
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blocksize = btrfs_level_size(root, *level - 1);
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ret = drop_snap_lookup_refcount(trans, root, bytenr,
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blocksize, &refs);
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BUG_ON(ret);
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/*
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* if there is more than one reference, we don't need
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* to read that node to drop any references it has. We
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* just drop the ref we hold on that node and move on to the
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* next slot in this level.
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*/
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if (refs != 1) {
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parent = path->nodes[*level];
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root_owner = btrfs_header_owner(parent);
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root_gen = btrfs_header_generation(parent);
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path->slots[*level]++;
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ret = btrfs_free_extent(trans, root, bytenr,
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blocksize, parent->start,
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root_owner, root_gen,
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*level - 1, 1);
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BUG_ON(ret);
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atomic_inc(&root->fs_info->throttle_gen);
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wake_up(&root->fs_info->transaction_throttle);
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cond_resched();
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continue;
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}
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/*
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* we need to keep freeing things in the next level down.
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* read the block and loop around to process it
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*/
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next = read_tree_block(root, bytenr, blocksize, ptr_gen);
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WARN_ON(*level <= 0);
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if (path->nodes[*level-1])
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free_extent_buffer(path->nodes[*level-1]);
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path->nodes[*level-1] = next;
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*level = btrfs_header_level(next);
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path->slots[*level] = 0;
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cond_resched();
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}
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out:
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WARN_ON(*level < 0);
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WARN_ON(*level >= BTRFS_MAX_LEVEL);
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if (path->nodes[*level] == root->node) {
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parent = path->nodes[*level];
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bytenr = path->nodes[*level]->start;
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} else {
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parent = path->nodes[*level + 1];
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bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]);
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}
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blocksize = btrfs_level_size(root, *level);
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root_owner = btrfs_header_owner(parent);
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root_gen = btrfs_header_generation(parent);
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/*
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* cleanup and free the reference on the last node
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* we processed
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*/
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ret = btrfs_free_extent(trans, root, bytenr, blocksize,
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parent->start, root_owner, root_gen,
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*level, 1);
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free_extent_buffer(path->nodes[*level]);
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path->nodes[*level] = NULL;
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*level += 1;
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BUG_ON(ret);
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cond_resched();
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return 0;
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}
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#endif
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struct walk_control {
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u64 refs[BTRFS_MAX_LEVEL];
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u64 flags[BTRFS_MAX_LEVEL];
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|
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@ -7129,288 +6705,6 @@ int btrfs_prepare_block_group_relocation(struct btrfs_root *root,
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return 0;
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}
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#if 0
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static int __insert_orphan_inode(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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u64 objectid, u64 size)
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{
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struct btrfs_path *path;
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struct btrfs_inode_item *item;
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struct extent_buffer *leaf;
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int ret;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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path->leave_spinning = 1;
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ret = btrfs_insert_empty_inode(trans, root, path, objectid);
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if (ret)
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goto out;
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leaf = path->nodes[0];
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item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item);
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memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item));
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btrfs_set_inode_generation(leaf, item, 1);
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btrfs_set_inode_size(leaf, item, size);
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btrfs_set_inode_mode(leaf, item, S_IFREG | 0600);
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btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS);
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btrfs_mark_buffer_dirty(leaf);
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btrfs_release_path(root, path);
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out:
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btrfs_free_path(path);
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return ret;
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}
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static noinline struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *group)
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{
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struct inode *inode = NULL;
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struct btrfs_trans_handle *trans;
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struct btrfs_root *root;
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struct btrfs_key root_key;
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u64 objectid = BTRFS_FIRST_FREE_OBJECTID;
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int err = 0;
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|
||||
root_key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
|
||||
root_key.type = BTRFS_ROOT_ITEM_KEY;
|
||||
root_key.offset = (u64)-1;
|
||||
root = btrfs_read_fs_root_no_name(fs_info, &root_key);
|
||||
if (IS_ERR(root))
|
||||
return ERR_CAST(root);
|
||||
|
||||
trans = btrfs_start_transaction(root, 1);
|
||||
BUG_ON(!trans);
|
||||
|
||||
err = btrfs_find_free_objectid(trans, root, objectid, &objectid);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
err = __insert_orphan_inode(trans, root, objectid, group->key.offset);
|
||||
BUG_ON(err);
|
||||
|
||||
err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0,
|
||||
group->key.offset, 0, group->key.offset,
|
||||
0, 0, 0);
|
||||
BUG_ON(err);
|
||||
|
||||
inode = btrfs_iget_locked(root->fs_info->sb, objectid, root);
|
||||
if (inode->i_state & I_NEW) {
|
||||
BTRFS_I(inode)->root = root;
|
||||
BTRFS_I(inode)->location.objectid = objectid;
|
||||
BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
|
||||
BTRFS_I(inode)->location.offset = 0;
|
||||
btrfs_read_locked_inode(inode);
|
||||
unlock_new_inode(inode);
|
||||
BUG_ON(is_bad_inode(inode));
|
||||
} else {
|
||||
BUG_ON(1);
|
||||
}
|
||||
BTRFS_I(inode)->index_cnt = group->key.objectid;
|
||||
|
||||
err = btrfs_orphan_add(trans, inode);
|
||||
out:
|
||||
btrfs_end_transaction(trans, root);
|
||||
if (err) {
|
||||
if (inode)
|
||||
iput(inode);
|
||||
inode = ERR_PTR(err);
|
||||
}
|
||||
return inode;
|
||||
}
|
||||
|
||||
int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len)
|
||||
{
|
||||
|
||||
struct btrfs_ordered_sum *sums;
|
||||
struct btrfs_sector_sum *sector_sum;
|
||||
struct btrfs_ordered_extent *ordered;
|
||||
struct btrfs_root *root = BTRFS_I(inode)->root;
|
||||
struct list_head list;
|
||||
size_t offset;
|
||||
int ret;
|
||||
u64 disk_bytenr;
|
||||
|
||||
INIT_LIST_HEAD(&list);
|
||||
|
||||
ordered = btrfs_lookup_ordered_extent(inode, file_pos);
|
||||
BUG_ON(ordered->file_offset != file_pos || ordered->len != len);
|
||||
|
||||
disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt;
|
||||
ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr,
|
||||
disk_bytenr + len - 1, &list);
|
||||
|
||||
while (!list_empty(&list)) {
|
||||
sums = list_entry(list.next, struct btrfs_ordered_sum, list);
|
||||
list_del_init(&sums->list);
|
||||
|
||||
sector_sum = sums->sums;
|
||||
sums->bytenr = ordered->start;
|
||||
|
||||
offset = 0;
|
||||
while (offset < sums->len) {
|
||||
sector_sum->bytenr += ordered->start - disk_bytenr;
|
||||
sector_sum++;
|
||||
offset += root->sectorsize;
|
||||
}
|
||||
|
||||
btrfs_add_ordered_sum(inode, ordered, sums);
|
||||
}
|
||||
btrfs_put_ordered_extent(ordered);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start)
|
||||
{
|
||||
struct btrfs_trans_handle *trans;
|
||||
struct btrfs_path *path;
|
||||
struct btrfs_fs_info *info = root->fs_info;
|
||||
struct extent_buffer *leaf;
|
||||
struct inode *reloc_inode;
|
||||
struct btrfs_block_group_cache *block_group;
|
||||
struct btrfs_key key;
|
||||
u64 skipped;
|
||||
u64 cur_byte;
|
||||
u64 total_found;
|
||||
u32 nritems;
|
||||
int ret;
|
||||
int progress;
|
||||
int pass = 0;
|
||||
|
||||
root = root->fs_info->extent_root;
|
||||
|
||||
block_group = btrfs_lookup_block_group(info, group_start);
|
||||
BUG_ON(!block_group);
|
||||
|
||||
printk(KERN_INFO "btrfs relocating block group %llu flags %llu\n",
|
||||
(unsigned long long)block_group->key.objectid,
|
||||
(unsigned long long)block_group->flags);
|
||||
|
||||
path = btrfs_alloc_path();
|
||||
BUG_ON(!path);
|
||||
|
||||
reloc_inode = create_reloc_inode(info, block_group);
|
||||
BUG_ON(IS_ERR(reloc_inode));
|
||||
|
||||
__alloc_chunk_for_shrink(root, block_group, 1);
|
||||
set_block_group_readonly(block_group);
|
||||
|
||||
btrfs_start_delalloc_inodes(info->tree_root);
|
||||
btrfs_wait_ordered_extents(info->tree_root, 0);
|
||||
again:
|
||||
skipped = 0;
|
||||
total_found = 0;
|
||||
progress = 0;
|
||||
key.objectid = block_group->key.objectid;
|
||||
key.offset = 0;
|
||||
key.type = 0;
|
||||
cur_byte = key.objectid;
|
||||
|
||||
trans = btrfs_start_transaction(info->tree_root, 1);
|
||||
btrfs_commit_transaction(trans, info->tree_root);
|
||||
|
||||
mutex_lock(&root->fs_info->cleaner_mutex);
|
||||
btrfs_clean_old_snapshots(info->tree_root);
|
||||
btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1);
|
||||
mutex_unlock(&root->fs_info->cleaner_mutex);
|
||||
|
||||
trans = btrfs_start_transaction(info->tree_root, 1);
|
||||
btrfs_commit_transaction(trans, info->tree_root);
|
||||
|
||||
while (1) {
|
||||
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
next:
|
||||
leaf = path->nodes[0];
|
||||
nritems = btrfs_header_nritems(leaf);
|
||||
if (path->slots[0] >= nritems) {
|
||||
ret = btrfs_next_leaf(root, path);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
if (ret == 1) {
|
||||
ret = 0;
|
||||
break;
|
||||
}
|
||||
leaf = path->nodes[0];
|
||||
nritems = btrfs_header_nritems(leaf);
|
||||
}
|
||||
|
||||
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
||||
|
||||
if (key.objectid >= block_group->key.objectid +
|
||||
block_group->key.offset)
|
||||
break;
|
||||
|
||||
if (progress && need_resched()) {
|
||||
btrfs_release_path(root, path);
|
||||
cond_resched();
|
||||
progress = 0;
|
||||
continue;
|
||||
}
|
||||
progress = 1;
|
||||
|
||||
if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY ||
|
||||
key.objectid + key.offset <= cur_byte) {
|
||||
path->slots[0]++;
|
||||
goto next;
|
||||
}
|
||||
|
||||
total_found++;
|
||||
cur_byte = key.objectid + key.offset;
|
||||
btrfs_release_path(root, path);
|
||||
|
||||
__alloc_chunk_for_shrink(root, block_group, 0);
|
||||
ret = relocate_one_extent(root, path, &key, block_group,
|
||||
reloc_inode, pass);
|
||||
BUG_ON(ret < 0);
|
||||
if (ret > 0)
|
||||
skipped++;
|
||||
|
||||
key.objectid = cur_byte;
|
||||
key.type = 0;
|
||||
key.offset = 0;
|
||||
}
|
||||
|
||||
btrfs_release_path(root, path);
|
||||
|
||||
if (pass == 0) {
|
||||
btrfs_wait_ordered_range(reloc_inode, 0, (u64)-1);
|
||||
invalidate_mapping_pages(reloc_inode->i_mapping, 0, -1);
|
||||
}
|
||||
|
||||
if (total_found > 0) {
|
||||
printk(KERN_INFO "btrfs found %llu extents in pass %d\n",
|
||||
(unsigned long long)total_found, pass);
|
||||
pass++;
|
||||
if (total_found == skipped && pass > 2) {
|
||||
iput(reloc_inode);
|
||||
reloc_inode = create_reloc_inode(info, block_group);
|
||||
pass = 0;
|
||||
}
|
||||
goto again;
|
||||
}
|
||||
|
||||
/* delete reloc_inode */
|
||||
iput(reloc_inode);
|
||||
|
||||
/* unpin extents in this range */
|
||||
trans = btrfs_start_transaction(info->tree_root, 1);
|
||||
btrfs_commit_transaction(trans, info->tree_root);
|
||||
|
||||
spin_lock(&block_group->lock);
|
||||
WARN_ON(block_group->pinned > 0);
|
||||
WARN_ON(block_group->reserved > 0);
|
||||
WARN_ON(btrfs_block_group_used(&block_group->item) > 0);
|
||||
spin_unlock(&block_group->lock);
|
||||
btrfs_put_block_group(block_group);
|
||||
ret = 0;
|
||||
out:
|
||||
btrfs_free_path(path);
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* checks to see if its even possible to relocate this block group.
|
||||
*
|
||||
|
|
|
|||
Loading…
Reference in New Issue