linux/fs/freevxfs/vxfs_bmap.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2000-2001 Christoph Hellwig.
 */

/*
 * Veritas filesystem driver - filesystem to disk block mapping.
 */
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/kernel.h>

#include "vxfs.h"
#include "vxfs_inode.h"
#include "vxfs_extern.h"


#ifdef DIAGNOSTIC
static void
vxfs_typdump(struct vxfs_typed *typ)
{
	printk(KERN_DEBUG "type=%Lu ", typ->vt_hdr >> VXFS_TYPED_TYPESHIFT);
	printk("offset=%Lx ", typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
	printk("block=%x ", typ->vt_block);
	printk("size=%x\n", typ->vt_size);
}
#endif

/**
 * vxfs_bmap_ext4 - do bmap for ext4 extents
 * @ip:		pointer to the inode we do bmap for
 * @bn:		logical block.
 *
 * Description:
 *   vxfs_bmap_ext4 performs the bmap operation for inodes with
 *   ext4-style extents (which are much like the traditional UNIX
 *   inode organisation).
 *
 * Returns:
 *   The physical block number on success, else Zero.
 */
static daddr_t
vxfs_bmap_ext4(struct inode *ip, long bn)
{ … }

/**
 * vxfs_bmap_indir - recursion for vxfs_bmap_typed
 * @ip:		pointer to the inode we do bmap for
 * @indir:	indirect block we start reading at
 * @size:	size of the typed area to search
 * @block:	partially result from further searches
 *
 * Description:
 *   vxfs_bmap_indir reads a &struct vxfs_typed at @indir
 *   and performs the type-defined action.
 *
 * Returns:
 *   The physical block number on success, else Zero.
 *
 * Note:
 *   Kernelstack is rare.  Unrecurse?
 */
static daddr_t
vxfs_bmap_indir(struct inode *ip, long indir, int size, long block)
{ … }

/**
 * vxfs_bmap_typed - bmap for typed extents
 * @ip:		pointer to the inode we do bmap for
 * @iblock:	logical block
 *
 * Description:
 *   Performs the bmap operation for typed extents.
 *
 * Returns:
 *   The physical block number on success, else Zero.
 */
static daddr_t
vxfs_bmap_typed(struct inode *ip, long iblock)
{ … }

/**
 * vxfs_bmap1 - vxfs-internal bmap operation
 * @ip:			pointer to the inode we do bmap for
 * @iblock:		logical block
 *
 * Description:
 *   vxfs_bmap1 perfoms a logical to physical block mapping
 *   for vxfs-internal purposes.
 *
 * Returns:
 *   The physical block number on success, else Zero.
 */
daddr_t
vxfs_bmap1(struct inode *ip, long iblock)
{ … }