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Btrfs: Audit callers and return codes to make sure -ENOSPC gets up the stack

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-06-22 14:16:25 -04:00
committed by David Woodhouse
parent 11bd143fc8
commit 54aa1f4dfd
11 changed files with 411 additions and 216 deletions
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143
fs/btrfs/extent-tree.c
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@@ -100,6 +100,8 @@ static int cache_block_group(struct btrfs_root *root,
if (slot >= btrfs_header_nritems(&leaf->header)) {
reada_extent_leaves(root, path, limit);
ret = btrfs_next_leaf(root, path);
if (ret < 0)
goto err;
if (ret == 0) {
continue;
} else {
@@ -148,6 +150,7 @@ static int cache_block_group(struct btrfs_root *root,
}
block_group->cached = 1;
err:
btrfs_free_path(path);
return 0;
}
@@ -201,7 +204,9 @@ static u64 find_search_start(struct btrfs_root *root,
last = max(last, cache->last_prealloc);
}
again:
cache_block_group(root, cache);
ret = cache_block_group(root, cache);
if (ret)
goto out;
while(1) {
ret = find_first_radix_bit(&root->fs_info->extent_map_radix,
gang, last, ARRAY_SIZE(gang));
@@ -398,16 +403,23 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_key ins;
u32 refs;
find_free_extent(trans, root->fs_info->extent_root, 0, 0, (u64)-1, 0,
&ins, 0);
path = btrfs_alloc_path();
BUG_ON(!path);
if (!path)
return -ENOMEM;
ret = find_free_extent(trans, root->fs_info->extent_root, 0, 0,
(u64)-1, 0, &ins, 0);
if (ret) {
btrfs_free_path(path);
return ret;
}
key.objectid = blocknr;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
key.offset = num_blocks;
ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
0, 1);
if (ret < 0)
return ret;
if (ret != 0) {
BUG();
}
@@ -442,12 +454,14 @@ static int lookup_extent_ref(struct btrfs_trans_handle *trans,
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path,
0, 0);
if (ret < 0)
goto out;
if (ret != 0)
BUG();
l = btrfs_buffer_leaf(path->nodes[0]);
item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item);
*refs = btrfs_extent_refs(item);
btrfs_release_path(root->fs_info->extent_root, path);
out:
btrfs_free_path(path);
return 0;
}
@@ -469,6 +483,8 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
int i;
int leaf;
int ret;
int faili;
int err;
if (!root->ref_cows)
return 0;
@@ -491,14 +507,45 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
continue;
ret = btrfs_inc_extent_ref(trans, root, disk_blocknr,
btrfs_file_extent_disk_num_blocks(fi));
BUG_ON(ret);
if (ret) {
faili = i;
goto fail;
}
} else {
blocknr = btrfs_node_blockptr(buf_node, i);
ret = btrfs_inc_extent_ref(trans, root, blocknr, 1);
BUG_ON(ret);
if (ret) {
faili = i;
goto fail;
}
}
}
return 0;
fail:
for (i =0; i < faili; i++) {
if (leaf) {
u64 disk_blocknr;
key = &buf_leaf->items[i].key;
if (btrfs_disk_key_type(key) != BTRFS_EXTENT_DATA_KEY)
continue;
fi = btrfs_item_ptr(buf_leaf, i,
struct btrfs_file_extent_item);
if (btrfs_file_extent_type(fi) ==
BTRFS_FILE_EXTENT_INLINE)
continue;
disk_blocknr = btrfs_file_extent_disk_blocknr(fi);
if (disk_blocknr == 0)
continue;
err = btrfs_free_extent(trans, root, disk_blocknr,
btrfs_file_extent_disk_num_blocks(fi), 0);
BUG_ON(err);
} else {
blocknr = btrfs_node_blockptr(buf_node, i);
err = btrfs_free_extent(trans, root, blocknr, 1, 0);
BUG_ON(err);
}
}
return ret;
}
static int write_one_cache_group(struct btrfs_trans_handle *trans,
@@ -512,15 +559,20 @@ static int write_one_cache_group(struct btrfs_trans_handle *trans,
struct btrfs_block_group_item *bi;
struct btrfs_key ins;
find_free_extent(trans, extent_root, 0, 0, (u64)-1, 0, &ins, 0);
ret = find_free_extent(trans, extent_root, 0, 0, (u64)-1, 0, &ins, 0);
/* FIXME, set bit to recalc cache groups on next mount */
if (ret)
return ret;
ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1);
if (ret < 0)
goto fail;
BUG_ON(ret);
bi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
struct btrfs_block_group_item);
memcpy(bi, &cache->item, sizeof(*bi));
mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(extent_root, path);
fail:
finish_current_insert(trans, extent_root);
pending_ret = del_pending_extents(trans, extent_root);
if (ret)
@@ -543,6 +595,7 @@ static int write_dirty_block_radix(struct btrfs_trans_handle *trans,
int werr = 0;
int i;
struct btrfs_path *path;
unsigned long off = 0;
path = btrfs_alloc_path();
if (!path)
@@ -550,18 +603,28 @@ static int write_dirty_block_radix(struct btrfs_trans_handle *trans,
while(1) {
ret = radix_tree_gang_lookup_tag(radix, (void **)cache,
0, ARRAY_SIZE(cache),
off, ARRAY_SIZE(cache),
BTRFS_BLOCK_GROUP_DIRTY);
if (!ret)
break;
for (i = 0; i < ret; i++) {
err = write_one_cache_group(trans, root,
path, cache[i]);
/*
* if we fail to write the cache group, we want
* to keep it marked dirty in hopes that a later
* write will work
*/
if (err) {
werr = err;
off = cache[i]->key.objectid +
cache[i]->key.offset;
continue;
}
radix_tree_tag_clear(radix, cache[i]->key.objectid +
cache[i]->key.offset - 1,
BTRFS_BLOCK_GROUP_DIRTY);
err = write_one_cache_group(trans, root,
path, cache[i]);
if (err)
werr = err;
}
}
btrfs_free_path(path);
@@ -801,14 +864,20 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
key.offset = num_blocks;
find_free_extent(trans, root, 0, 0, (u64)-1, 0, &ins, 0);
path = btrfs_alloc_path();
BUG_ON(!path);
if (!path)
return -ENOMEM;
ret = find_free_extent(trans, root, 0, 0, (u64)-1, 0, &ins, 0);
if (ret) {
btrfs_free_path(path);
return ret;
}
ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1);
if (ret) {
BUG();
}
if (ret < 0)
return ret;
BUG_ON(ret);
ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
struct btrfs_extent_item);
BUG_ON(ei->refs == 0);
@@ -827,8 +896,9 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
btrfs_set_super_blocks_used(info->disk_super,
super_blocks_used - num_blocks);
ret = btrfs_del_item(trans, extent_root, path);
if (ret)
BUG();
if (ret) {
return ret;
}
ret = update_block_group(trans, root, blocknr, num_blocks, 0,
mark_free, 0);
BUG_ON(ret);
@@ -1075,7 +1145,6 @@ next:
path->slots[0]++;
cond_resched();
}
// FIXME -ENOSPC
check_pending:
/* we have to make sure we didn't find an extent that has already
* been allocated by the map tree or the original allocation
@@ -1246,7 +1315,15 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
ret = find_free_extent(trans, root, num_blocks, search_start,
search_end, hint_block, ins, data);
if (ret) {
return ret;
if (search_start == 0)
return ret;
search_end = search_start - 1;
search_start = 0;
hint_block = search_start;
ret = find_free_extent(trans, root, num_blocks, search_start,
search_end, hint_block, ins, data);
if (ret)
return ret;
}
/*
@@ -1271,7 +1348,16 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
search_end, hint_block,
&prealloc_key, 0);
if (ret) {
return ret;
if (search_start == 0)
return ret;
search_end = search_start - 1;
search_start = 0;
hint_block = search_start;
ret = find_free_extent(trans, root, 0, search_start,
search_end, hint_block,
&prealloc_key, 0);
if (ret)
return ret;
}
}
@@ -1309,11 +1395,14 @@ struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
ret = btrfs_alloc_extent(trans, root, root->root_key.objectid,
1, hint, (unsigned long)-1, &ins, 0);
if (ret) {
BUG();
return NULL;
BUG_ON(ret > 0);
return ERR_PTR(ret);
}
BUG_ON(ret);
buf = btrfs_find_create_tree_block(root, ins.objectid);
if (!buf) {
btrfs_free_extent(trans, root, ins.objectid, 1, 0);
return ERR_PTR(-ENOMEM);
}
set_buffer_uptodate(buf);
set_buffer_checked(buf);
set_radix_bit(&trans->transaction->dirty_pages, buf->b_page->index);