mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 00:36:40 +07:00
559af82114
These are all the cases where a variable is set, but not read which are not bugs as far as I can see, but simply leftovers. Still needs more review. Found by gcc 4.6's new warnings Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Chris Mason <chris.mason@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Chris Mason <chris.mason@oracle.com>
146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include "ctree.h"
|
|
#include "disk-io.h"
|
|
#include "print-tree.h"
|
|
#include "transaction.h"
|
|
#include "locking.h"
|
|
|
|
/* defrag all the leaves in a given btree. If cache_only == 1, don't read
|
|
* things from disk, otherwise read all the leaves and try to get key order to
|
|
* better reflect disk order
|
|
*/
|
|
|
|
int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, int cache_only)
|
|
{
|
|
struct btrfs_path *path = NULL;
|
|
struct btrfs_key key;
|
|
int ret = 0;
|
|
int wret;
|
|
int level;
|
|
int is_extent = 0;
|
|
int next_key_ret = 0;
|
|
u64 last_ret = 0;
|
|
u64 min_trans = 0;
|
|
|
|
if (cache_only)
|
|
goto out;
|
|
|
|
if (root->fs_info->extent_root == root) {
|
|
/*
|
|
* there's recursion here right now in the tree locking,
|
|
* we can't defrag the extent root without deadlock
|
|
*/
|
|
goto out;
|
|
}
|
|
|
|
if (root->ref_cows == 0 && !is_extent)
|
|
goto out;
|
|
|
|
if (btrfs_test_opt(root, SSD))
|
|
goto out;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
level = btrfs_header_level(root->node);
|
|
|
|
if (level == 0)
|
|
goto out;
|
|
|
|
if (root->defrag_progress.objectid == 0) {
|
|
struct extent_buffer *root_node;
|
|
u32 nritems;
|
|
|
|
root_node = btrfs_lock_root_node(root);
|
|
btrfs_set_lock_blocking(root_node);
|
|
nritems = btrfs_header_nritems(root_node);
|
|
root->defrag_max.objectid = 0;
|
|
/* from above we know this is not a leaf */
|
|
btrfs_node_key_to_cpu(root_node, &root->defrag_max,
|
|
nritems - 1);
|
|
btrfs_tree_unlock(root_node);
|
|
free_extent_buffer(root_node);
|
|
memset(&key, 0, sizeof(key));
|
|
} else {
|
|
memcpy(&key, &root->defrag_progress, sizeof(key));
|
|
}
|
|
|
|
path->keep_locks = 1;
|
|
if (cache_only)
|
|
min_trans = root->defrag_trans_start;
|
|
|
|
ret = btrfs_search_forward(root, &key, NULL, path,
|
|
cache_only, min_trans);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret > 0) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
btrfs_release_path(root, path);
|
|
wret = btrfs_search_slot(trans, root, &key, path, 0, 1);
|
|
|
|
if (wret < 0) {
|
|
ret = wret;
|
|
goto out;
|
|
}
|
|
if (!path->nodes[1]) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
path->slots[1] = btrfs_header_nritems(path->nodes[1]);
|
|
next_key_ret = btrfs_find_next_key(root, path, &key, 1, cache_only,
|
|
min_trans);
|
|
ret = btrfs_realloc_node(trans, root,
|
|
path->nodes[1], 0,
|
|
cache_only, &last_ret,
|
|
&root->defrag_progress);
|
|
if (ret) {
|
|
WARN_ON(ret == -EAGAIN);
|
|
goto out;
|
|
}
|
|
if (next_key_ret == 0) {
|
|
memcpy(&root->defrag_progress, &key, sizeof(key));
|
|
ret = -EAGAIN;
|
|
}
|
|
out:
|
|
if (path)
|
|
btrfs_free_path(path);
|
|
if (ret == -EAGAIN) {
|
|
if (root->defrag_max.objectid > root->defrag_progress.objectid)
|
|
goto done;
|
|
if (root->defrag_max.type > root->defrag_progress.type)
|
|
goto done;
|
|
if (root->defrag_max.offset > root->defrag_progress.offset)
|
|
goto done;
|
|
ret = 0;
|
|
}
|
|
done:
|
|
if (ret != -EAGAIN) {
|
|
memset(&root->defrag_progress, 0,
|
|
sizeof(root->defrag_progress));
|
|
root->defrag_trans_start = trans->transid;
|
|
}
|
|
return ret;
|
|
}
|