linux/fs/xfs/xfs_dir2_readdir.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * Copyright (c) 2013 Red Hat, Inc.
 * All Rights Reserved.
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_dir2.h"
#include "xfs_dir2_priv.h"
#include "xfs_trace.h"
#include "xfs_bmap.h"
#include "xfs_trans.h"
#include "xfs_error.h"
#include "xfs_health.h"

/*
 * Directory file type support functions
 */
static unsigned char xfs_dir3_filetype_table[] = …;

unsigned char
xfs_dir3_get_dtype(
	struct xfs_mount	*mp,
	uint8_t			filetype)
{ … }

STATIC int
xfs_dir2_sf_getdents(
	struct xfs_da_args	*args,
	struct dir_context	*ctx)
{ … }

/*
 * Readdir for block directories.
 */
STATIC int
xfs_dir2_block_getdents(
	struct xfs_da_args	*args,
	struct dir_context	*ctx,
	unsigned int		*lock_mode)
{ … }

/*
 * Read a directory block and initiate readahead for blocks beyond that.
 * We maintain a sliding readahead window of the remaining space in the
 * buffer rounded up to the nearest block.
 */
STATIC int
xfs_dir2_leaf_readbuf(
	struct xfs_da_args	*args,
	size_t			bufsize,
	xfs_dir2_off_t		*cur_off,
	xfs_dablk_t		*ra_blk,
	struct xfs_buf		**bpp)
{ … }

/*
 * Getdents (readdir) for leaf and node directories.
 * This reads the data blocks only, so is the same for both forms.
 */
STATIC int
xfs_dir2_leaf_getdents(
	struct xfs_da_args	*args,
	struct dir_context	*ctx,
	size_t			bufsize,
	unsigned int		*lock_mode)
{ … }

/*
 * Read a directory.
 *
 * If supplied, the transaction collects locked dir buffers to avoid
 * nested buffer deadlocks.  This function does not dirty the
 * transaction.  The caller must hold the IOLOCK (shared or exclusive)
 * before calling this function.
 */
int
xfs_readdir(
	struct xfs_trans	*tp,
	struct xfs_inode	*dp,
	struct dir_context	*ctx,
	size_t			bufsize)
{ … }