xfs_inode_fork.c | Explore in Territory

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2006 Silicon Graphics, 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_trans.h"
#include "xfs_inode_item.h"
#include "xfs_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_bmap.h"
#include "xfs_error.h"
#include "xfs_trace.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_dir2_priv.h"
#include "xfs_attr_leaf.h"
#include "xfs_types.h"
#include "xfs_errortag.h"
#include "xfs_health.h"
#include "xfs_symlink_remote.h"

struct kmem_cache *xfs_ifork_cache;

void
xfs_init_local_fork(
	struct xfs_inode	*ip,
	int			whichfork,
	const void		*data,
	int64_t			size)
{ … }

/*
 * The file is in-lined in the on-disk inode.
 */
STATIC int
xfs_iformat_local(
	struct xfs_inode	*ip,
	struct xfs_dinode	*dip,
	int			whichfork,
	int			size)
{ … }

/*
 * The file consists of a set of extents all of which fit into the on-disk
 * inode.
 */
STATIC int
xfs_iformat_extents(
	struct xfs_inode	*ip,
	struct xfs_dinode	*dip,
	int			whichfork)
{ … }

/*
 * The file has too many extents to fit into
 * the inode, so they are in B-tree format.
 * Allocate a buffer for the root of the B-tree
 * and copy the root into it.  The i_extents
 * field will remain NULL until all of the
 * extents are read in (when they are needed).
 */
STATIC int
xfs_iformat_btree(
	struct xfs_inode	*ip,
	struct xfs_dinode	*dip,
	int			whichfork)
{ … }

int
xfs_iformat_data_fork(
	struct xfs_inode	*ip,
	struct xfs_dinode	*dip)
{ … }

static uint16_t
xfs_dfork_attr_shortform_size(
	struct xfs_dinode		*dip)
{ … }

void
xfs_ifork_init_attr(
	struct xfs_inode	*ip,
	enum xfs_dinode_fmt	format,
	xfs_extnum_t		nextents)
{ … }

void
xfs_ifork_zap_attr(
	struct xfs_inode	*ip)
{ … }

int
xfs_iformat_attr_fork(
	struct xfs_inode	*ip,
	struct xfs_dinode	*dip)
{ … }

/*
 * Reallocate the space for if_broot based on the number of records
 * being added or deleted as indicated in rec_diff.  Move the records
 * and pointers in if_broot to fit the new size.  When shrinking this
 * will eliminate holes between the records and pointers created by
 * the caller.  When growing this will create holes to be filled in
 * by the caller.
 *
 * The caller must not request to add more records than would fit in
 * the on-disk inode root.  If the if_broot is currently NULL, then
 * if we are adding records, one will be allocated.  The caller must also
 * not request that the number of records go below zero, although
 * it can go to zero.
 *
 * ip -- the inode whose if_broot area is changing
 * ext_diff -- the change in the number of records, positive or negative,
 *	 requested for the if_broot array.
 */
void
xfs_iroot_realloc(
	xfs_inode_t		*ip,
	int			rec_diff,
	int			whichfork)
{ … }


/*
 * This is called when the amount of space needed for if_data
 * is increased or decreased.  The change in size is indicated by
 * the number of bytes that need to be added or deleted in the
 * byte_diff parameter.
 *
 * If the amount of space needed has decreased below the size of the
 * inline buffer, then switch to using the inline buffer.  Otherwise,
 * use krealloc() or kmalloc() to adjust the size of the buffer
 * to what is needed.
 *
 * ip -- the inode whose if_data area is changing
 * byte_diff -- the change in the number of bytes, positive or negative,
 *	 requested for the if_data array.
 */
void *
xfs_idata_realloc(
	struct xfs_inode	*ip,
	int64_t			byte_diff,
	int			whichfork)
{ … }

/* Free all memory and reset a fork back to its initial state. */
void
xfs_idestroy_fork(
	struct xfs_ifork	*ifp)
{ … }

/*
 * Convert in-core extents to on-disk form
 *
 * In the case of the data fork, the in-core and on-disk fork sizes can be
 * different due to delayed allocation extents. We only copy on-disk extents
 * here, so callers must always use the physical fork size to determine the
 * size of the buffer passed to this routine.  We will return the size actually
 * used.
 */
int
xfs_iextents_copy(
	struct xfs_inode	*ip,
	struct xfs_bmbt_rec	*dp,
	int			whichfork)
{ … }

/*
 * Each of the following cases stores data into the same region
 * of the on-disk inode, so only one of them can be valid at
 * any given time. While it is possible to have conflicting formats
 * and log flags, e.g. having XFS_ILOG_?DATA set when the fork is
 * in EXTENTS format, this can only happen when the fork has
 * changed formats after being modified but before being flushed.
 * In these cases, the format always takes precedence, because the
 * format indicates the current state of the fork.
 */
void
xfs_iflush_fork(
	struct xfs_inode	*ip,
	struct xfs_dinode	*dip,
	struct xfs_inode_log_item *iip,
	int			whichfork)
{ … }

/* Convert bmap state flags to an inode fork. */
struct xfs_ifork *
xfs_iext_state_to_fork(
	struct xfs_inode	*ip,
	int			state)
{ … }

/*
 * Initialize an inode's copy-on-write fork.
 */
void
xfs_ifork_init_cow(
	struct xfs_inode	*ip)
{ … }

/* Verify the inline contents of the data fork of an inode. */
int
xfs_ifork_verify_local_data(
	struct xfs_inode	*ip)
{ … }

/* Verify the inline contents of the attr fork of an inode. */
int
xfs_ifork_verify_local_attr(
	struct xfs_inode	*ip)
{ … }

/*
 * Check if the inode fork supports adding nr_to_add more extents.
 *
 * If it doesn't but we can upgrade it to large extent counters, do the upgrade.
 * If we can't upgrade or are already using big counters but still can't fit the
 * additional extents, return -EFBIG.
 */
int
xfs_iext_count_extend(
	struct xfs_trans	*tp,
	struct xfs_inode	*ip,
	int			whichfork,
	uint			nr_to_add)
{ … }

/* Decide if a file mapping is on the realtime device or not. */
bool
xfs_ifork_is_realtime(
	struct xfs_inode	*ip,
	int			whichfork)
{ … }
linux/fs/xfs/libxfs/xfs_inode_fork.c
