linux/fs/gfs2/aops.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/pagemap.h>
#include <linux/pagevec.h>
#include <linux/mpage.h>
#include <linux/fs.h>
#include <linux/writeback.h>
#include <linux/swap.h>
#include <linux/gfs2_ondisk.h>
#include <linux/backing-dev.h>
#include <linux/uio.h>
#include <trace/events/writeback.h>
#include <linux/sched/signal.h>

#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
#include "glock.h"
#include "inode.h"
#include "log.h"
#include "meta_io.h"
#include "quota.h"
#include "trans.h"
#include "rgrp.h"
#include "super.h"
#include "util.h"
#include "glops.h"
#include "aops.h"


void gfs2_trans_add_databufs(struct gfs2_inode *ip, struct folio *folio,
			     size_t from, size_t len)
{ … }

/**
 * gfs2_get_block_noalloc - Fills in a buffer head with details about a block
 * @inode: The inode
 * @lblock: The block number to look up
 * @bh_result: The buffer head to return the result in
 * @create: Non-zero if we may add block to the file
 *
 * Returns: errno
 */

static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
				  struct buffer_head *bh_result, int create)
{ … }

/**
 * gfs2_write_jdata_folio - gfs2 jdata-specific version of block_write_full_folio
 * @folio: The folio to write
 * @wbc: The writeback control
 *
 * This is the same as calling block_write_full_folio, but it also
 * writes pages outside of i_size
 */
static int gfs2_write_jdata_folio(struct folio *folio,
				 struct writeback_control *wbc)
{ … }

/**
 * __gfs2_jdata_write_folio - The core of jdata writepage
 * @folio: The folio to write
 * @wbc: The writeback control
 *
 * Implements the core of write back. If a transaction is required then
 * the checked flag will have been set and the transaction will have
 * already been started before this is called.
 */
static int __gfs2_jdata_write_folio(struct folio *folio,
		struct writeback_control *wbc)
{ … }

/**
 * gfs2_jdata_writepage - Write complete page
 * @page: Page to write
 * @wbc: The writeback control
 *
 * Returns: errno
 *
 */

static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
{ … }

/**
 * gfs2_writepages - Write a bunch of dirty pages back to disk
 * @mapping: The mapping to write
 * @wbc: Write-back control
 *
 * Used for both ordered and writeback modes.
 */
static int gfs2_writepages(struct address_space *mapping,
			   struct writeback_control *wbc)
{ … }

/**
 * gfs2_write_jdata_batch - Write back a folio batch's worth of folios
 * @mapping: The mapping
 * @wbc: The writeback control
 * @fbatch: The batch of folios
 * @done_index: Page index
 *
 * Returns: non-zero if loop should terminate, zero otherwise
 */

static int gfs2_write_jdata_batch(struct address_space *mapping,
				    struct writeback_control *wbc,
				    struct folio_batch *fbatch,
				    pgoff_t *done_index)
{ … }

/**
 * gfs2_write_cache_jdata - Like write_cache_pages but different
 * @mapping: The mapping to write
 * @wbc: The writeback control
 *
 * The reason that we use our own function here is that we need to
 * start transactions before we grab page locks. This allows us
 * to get the ordering right.
 */

static int gfs2_write_cache_jdata(struct address_space *mapping,
				  struct writeback_control *wbc)
{ … }


/**
 * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
 * @mapping: The mapping to write
 * @wbc: The writeback control
 * 
 */

static int gfs2_jdata_writepages(struct address_space *mapping,
				 struct writeback_control *wbc)
{ … }

/**
 * stuffed_read_folio - Fill in a Linux folio with stuffed file data
 * @ip: the inode
 * @folio: the folio
 *
 * Returns: errno
 */
static int stuffed_read_folio(struct gfs2_inode *ip, struct folio *folio)
{ … }

/**
 * gfs2_read_folio - read a folio from a file
 * @file: The file to read
 * @folio: The folio in the file
 */
static int gfs2_read_folio(struct file *file, struct folio *folio)
{ … }

/**
 * gfs2_internal_read - read an internal file
 * @ip: The gfs2 inode
 * @buf: The buffer to fill
 * @pos: The file position
 * @size: The amount to read
 *
 */

ssize_t gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
			   size_t size)
{ … }

/**
 * gfs2_readahead - Read a bunch of pages at once
 * @rac: Read-ahead control structure
 *
 * Some notes:
 * 1. This is only for readahead, so we can simply ignore any things
 *    which are slightly inconvenient (such as locking conflicts between
 *    the page lock and the glock) and return having done no I/O. Its
 *    obviously not something we'd want to do on too regular a basis.
 *    Any I/O we ignore at this time will be done via readpage later.
 * 2. We don't handle stuffed files here we let readpage do the honours.
 * 3. mpage_readahead() does most of the heavy lifting in the common case.
 * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
 */

static void gfs2_readahead(struct readahead_control *rac)
{ … }

/**
 * adjust_fs_space - Adjusts the free space available due to gfs2_grow
 * @inode: the rindex inode
 */
void adjust_fs_space(struct inode *inode)
{ … }

static bool jdata_dirty_folio(struct address_space *mapping,
		struct folio *folio)
{ … }

/**
 * gfs2_bmap - Block map function
 * @mapping: Address space info
 * @lblock: The block to map
 *
 * Returns: The disk address for the block or 0 on hole or error
 */

static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
{ … }

static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
{ … }

static void gfs2_invalidate_folio(struct folio *folio, size_t offset,
				size_t length)
{ … }

/**
 * gfs2_release_folio - free the metadata associated with a folio
 * @folio: the folio that's being released
 * @gfp_mask: passed from Linux VFS, ignored by us
 *
 * Calls try_to_free_buffers() to free the buffers and put the folio if the
 * buffers can be released.
 *
 * Returns: true if the folio was put or else false
 */

bool gfs2_release_folio(struct folio *folio, gfp_t gfp_mask)
{ … }

static const struct address_space_operations gfs2_aops = …;

static const struct address_space_operations gfs2_jdata_aops = …;

void gfs2_set_aops(struct inode *inode)
{ … }