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Btrfs: Reduce stack usage in the resizer, fix 32 bit compiles

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-01-03 09:08:48 -05:00
parent 56b453c92f
commit 4313b3994d
5 changed files with 63 additions and 43 deletions
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74
fs/btrfs/extent-tree.c
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@@ -751,7 +751,7 @@ again:
if (found_objectid != root_objectid) {
total_count = 2;
break;
goto out;
}
total_count = 1;
path->slots[0]++;
@@ -760,8 +760,6 @@ again:
total_count = 0;
goto out;
}
if (total_count > 1)
goto out;
if (level >= 0 && root->node == count_path->nodes[level])
goto out;
level++;
@@ -2109,22 +2107,23 @@ static int relocate_inode_pages(struct inode *inode, u64 start, u64 len)
u64 delalloc_start;
u64 existing_delalloc;
unsigned long last_index;
unsigned long first_index;
unsigned long i;
struct page *page;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct file_ra_state ra;
struct file_ra_state *ra;
ra = kzalloc(sizeof(*ra), GFP_NOFS);
mutex_lock(&inode->i_mutex);
first_index = start >> PAGE_CACHE_SHIFT;
i = start >> PAGE_CACHE_SHIFT;
last_index = (start + len - 1) >> PAGE_CACHE_SHIFT;
memset(&ra, 0, sizeof(ra));
file_ra_state_init(&ra, inode->i_mapping);
btrfs_force_ra(inode->i_mapping, &ra, NULL, first_index, last_index);
file_ra_state_init(ra, inode->i_mapping);
btrfs_force_ra(inode->i_mapping, ra, NULL, i, last_index);
kfree(ra);
for (i = first_index; i <= last_index; i++) {
for (; i <= last_index; i++) {
page = grab_cache_page(inode->i_mapping, i);
if (!page)
goto out_unlock;
@@ -2167,27 +2166,43 @@ out_unlock:
return 0;
}
/*
* note, this releases the path
*/
static int relocate_one_reference(struct btrfs_root *extent_root,
struct btrfs_path *path,
struct btrfs_key *extent_key,
u64 ref_root, u64 ref_gen, u64 ref_objectid,
u64 ref_offset)
struct btrfs_key *extent_key)
{
struct inode *inode;
struct btrfs_root *found_root;
struct btrfs_key root_location;
struct btrfs_key *root_location;
struct btrfs_extent_ref *ref;
u64 ref_root;
u64 ref_gen;
u64 ref_objectid;
u64 ref_offset;
int ret;
root_location.objectid = ref_root;
ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_extent_ref);
ref_root = btrfs_ref_root(path->nodes[0], ref);
ref_gen = btrfs_ref_generation(path->nodes[0], ref);
ref_objectid = btrfs_ref_objectid(path->nodes[0], ref);
ref_offset = btrfs_ref_offset(path->nodes[0], ref);
btrfs_release_path(extent_root, path);
root_location = kmalloc(sizeof(*root_location), GFP_NOFS);
root_location->objectid = ref_root;
if (ref_gen == 0)
root_location.offset = 0;
root_location->offset = 0;
else
root_location.offset = (u64)-1;
root_location.type = BTRFS_ROOT_ITEM_KEY;
root_location->offset = (u64)-1;
root_location->type = BTRFS_ROOT_ITEM_KEY;
found_root = btrfs_read_fs_root_no_name(extent_root->fs_info,
&root_location);
root_location);
BUG_ON(!found_root);
kfree(root_location);
if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
mutex_unlock(&extent_root->fs_info->fs_mutex);
@@ -2259,12 +2274,7 @@ static int relocate_one_extent(struct btrfs_root *extent_root,
{
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_extent_ref *ref;
struct extent_buffer *leaf;
u64 ref_root;
u64 ref_gen;
u64 ref_objectid;
u64 ref_offset;
u32 nritems;
u32 item_size;
int ret = 0;
@@ -2297,17 +2307,7 @@ static int relocate_one_extent(struct btrfs_root *extent_root,
key.offset = found_key.offset + 1;
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
ref = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_ref);
ref_root = btrfs_ref_root(leaf, ref);
ref_gen = btrfs_ref_generation(leaf, ref);
ref_objectid = btrfs_ref_objectid(leaf, ref);
ref_offset = btrfs_ref_offset(leaf, ref);
btrfs_release_path(extent_root, path);
ret = relocate_one_reference(extent_root, path,
extent_key, ref_root, ref_gen,
ref_objectid, ref_offset);
ret = relocate_one_reference(extent_root, path, extent_key);
if (ret)
goto out;
}
@@ -2354,7 +2354,6 @@ int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size)
struct btrfs_path *path;
u64 cur_byte;
u64 total_found;
u64 ptr;
struct btrfs_fs_info *info = root->fs_info;
struct extent_map_tree *block_group_cache;
struct btrfs_key key;
@@ -2377,6 +2376,7 @@ again:
key.offset = 0;
key.type = 0;
while(1) {
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
@@ -2441,6 +2441,8 @@ next:
key.offset = 0;
key.type = 0;
while(1) {
u64 ptr;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret < 0)
goto out;