linux/fs/gfs2/meta_io.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/swap.h>
#include <linux/delay.h>
#include <linux/bio.h>
#include <linux/gfs2_ondisk.h>

#include "gfs2.h"
#include "incore.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "log.h"
#include "lops.h"
#include "meta_io.h"
#include "rgrp.h"
#include "trans.h"
#include "util.h"
#include "trace_gfs2.h"

static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wbc)
{ … }

const struct address_space_operations gfs2_meta_aops = …;

const struct address_space_operations gfs2_rgrp_aops = …;

/**
 * gfs2_getbuf - Get a buffer with a given address space
 * @gl: the glock
 * @blkno: the block number (filesystem scope)
 * @create: 1 if the buffer should be created
 *
 * Returns: the buffer
 */

struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
{ … }

static void meta_prep_new(struct buffer_head *bh)
{ … }

/**
 * gfs2_meta_new - Get a block
 * @gl: The glock associated with this block
 * @blkno: The block number
 *
 * Returns: The buffer
 */

struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
{ … }

static void gfs2_meta_read_endio(struct bio *bio)
{ … }

/*
 * Submit several consecutive buffer head I/O requests as a single bio I/O
 * request.  (See submit_bh_wbc.)
 */
static void gfs2_submit_bhs(blk_opf_t opf, struct buffer_head *bhs[], int num)
{ … }

/**
 * gfs2_meta_read - Read a block from disk
 * @gl: The glock covering the block
 * @blkno: The block number
 * @flags: flags
 * @rahead: Do read-ahead
 * @bhp: the place where the buffer is returned (NULL on failure)
 *
 * Returns: errno
 */

int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
		   int rahead, struct buffer_head **bhp)
{ … }

/**
 * gfs2_meta_wait - Reread a block from disk
 * @sdp: the filesystem
 * @bh: The block to wait for
 *
 * Returns: errno
 */

int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
{ … }

void gfs2_remove_from_journal(struct buffer_head *bh, int meta)
{ … }

/**
 * gfs2_ail1_wipe - remove deleted/freed buffers from the ail1 list
 * @sdp: superblock
 * @bstart: starting block address of buffers to remove
 * @blen: length of buffers to be removed
 *
 * This function is called from gfs2_journal wipe, whose job is to remove
 * buffers, corresponding to deleted blocks, from the journal. If we find any
 * bufdata elements on the system ail1 list, they haven't been written to
 * the journal yet. So we remove them.
 */
static void gfs2_ail1_wipe(struct gfs2_sbd *sdp, u64 bstart, u32 blen)
{ … }

static struct buffer_head *gfs2_getjdatabuf(struct gfs2_inode *ip, u64 blkno)
{ … }

/**
 * gfs2_journal_wipe - make inode's buffers so they aren't dirty/pinned anymore
 * @ip: the inode who owns the buffers
 * @bstart: the first buffer in the run
 * @blen: the number of buffers in the run
 *
 */

void gfs2_journal_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
{ … }

/**
 * gfs2_meta_buffer - Get a metadata buffer
 * @ip: The GFS2 inode
 * @mtype: The block type (GFS2_METATYPE_*)
 * @num: The block number (device relative) of the buffer
 * @bhp: the buffer is returned here
 *
 * Returns: errno
 */

int gfs2_meta_buffer(struct gfs2_inode *ip, u32 mtype, u64 num,
		     struct buffer_head **bhp)
{ … }

/**
 * gfs2_meta_ra - start readahead on an extent of a file
 * @gl: the glock the blocks belong to
 * @dblock: the starting disk block
 * @extlen: the number of blocks in the extent
 *
 * returns: the first buffer in the extent
 */

struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
{ … }