linux/fs/ocfs2/move_extents.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * move_extents.c
 *
 * Copyright (C) 2011 Oracle.  All rights reserved.
 */
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/mount.h>
#include <linux/swap.h>

#include <cluster/masklog.h>

#include "ocfs2.h"
#include "ocfs2_ioctl.h"

#include "alloc.h"
#include "localalloc.h"
#include "aops.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "inode.h"
#include "journal.h"
#include "suballoc.h"
#include "uptodate.h"
#include "super.h"
#include "dir.h"
#include "buffer_head_io.h"
#include "sysfile.h"
#include "refcounttree.h"
#include "move_extents.h"

struct ocfs2_move_extents_context { … };

static int __ocfs2_move_extent(handle_t *handle,
			       struct ocfs2_move_extents_context *context,
			       u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos,
			       int ext_flags)
{ … }

/*
 * lock allocator, and reserve appropriate number of bits for
 * meta blocks.
 */
static int ocfs2_lock_meta_allocator_move_extents(struct inode *inode,
					struct ocfs2_extent_tree *et,
					u32 clusters_to_move,
					u32 extents_to_split,
					struct ocfs2_alloc_context **meta_ac,
					int extra_blocks,
					int *credits)
{ … }

/*
 * Using one journal handle to guarantee the data consistency in case
 * crash happens anywhere.
 *
 *  XXX: defrag can end up with finishing partial extent as requested,
 * due to not enough contiguous clusters can be found in allocator.
 */
static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context,
			       u32 cpos, u32 phys_cpos, u32 *len, int ext_flags)
{ … }

/*
 * find the victim alloc group, where #blkno fits.
 */
static int ocfs2_find_victim_alloc_group(struct inode *inode,
					 u64 vict_blkno,
					 int type, int slot,
					 int *vict_bit,
					 struct buffer_head **ret_bh)
{ … }

/*
 * XXX: helper to validate and adjust moving goal.
 */
static int ocfs2_validate_and_adjust_move_goal(struct inode *inode,
					       struct ocfs2_move_extents *range)
{ … }

static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh,
				    int *goal_bit, u32 move_len, u32 max_hop,
				    u32 *phys_cpos)
{ … }

static int ocfs2_move_extent(struct ocfs2_move_extents_context *context,
			     u32 cpos, u32 phys_cpos, u32 *new_phys_cpos,
			     u32 len, int ext_flags)
{ … }

/*
 * Helper to calculate the defraging length in one run according to threshold.
 */
static void ocfs2_calc_extent_defrag_len(u32 *alloc_size, u32 *len_defraged,
					 u32 threshold, int *skip)
{ … }

static int __ocfs2_move_extents_range(struct buffer_head *di_bh,
				struct ocfs2_move_extents_context *context)
{ … }

static int ocfs2_move_extents(struct ocfs2_move_extents_context *context)
{ … }

int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp)
{ … }