linux/fs/xfs/xfs_filestream.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2006-2007 Silicon Graphics, Inc.
 * Copyright (c) 2014 Christoph Hellwig.
 * All Rights Reserved.
 */
#include "xfs.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_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_alloc.h"
#include "xfs_mru_cache.h"
#include "xfs_trace.h"
#include "xfs_ag.h"
#include "xfs_ag_resv.h"
#include "xfs_trans.h"
#include "xfs_filestream.h"

struct xfs_fstrm_item { … };

enum xfs_fstrm_alloc { … };

static void
xfs_fstrm_free_func(
	void			*data,
	struct xfs_mru_cache_elem *mru)
{ … }

/*
 * Scan the AGs starting at start_agno looking for an AG that isn't in use and
 * has at least minlen blocks free. If no AG is found to match the allocation
 * requirements, pick the AG with the most free space in it.
 */
static int
xfs_filestream_pick_ag(
	struct xfs_alloc_arg	*args,
	xfs_ino_t		pino,
	xfs_agnumber_t		start_agno,
	int			flags,
	xfs_extlen_t		*longest)
{ … }

static struct xfs_inode *
xfs_filestream_get_parent(
	struct xfs_inode	*ip)
{ … }

/*
 * Lookup the mru cache for an existing association. If one exists and we can
 * use it, return with an active perag reference indicating that the allocation
 * will proceed with that association.
 *
 * If we have no association, or we cannot use the current one and have to
 * destroy it, return with longest = 0 to tell the caller to create a new
 * association.
 */
static int
xfs_filestream_lookup_association(
	struct xfs_bmalloca	*ap,
	struct xfs_alloc_arg	*args,
	xfs_ino_t		pino,
	xfs_extlen_t		*longest)
{ … }

static int
xfs_filestream_create_association(
	struct xfs_bmalloca	*ap,
	struct xfs_alloc_arg	*args,
	xfs_ino_t		pino,
	xfs_extlen_t		*longest)
{ … }

/*
 * Search for an allocation group with a single extent large enough for
 * the request. First we look for an existing association and use that if it
 * is found. Otherwise, we create a new association by selecting an AG that fits
 * the allocation criteria.
 *
 * We return with a referenced perag in args->pag to indicate which AG we are
 * allocating into or an error with no references held.
 */
int
xfs_filestream_select_ag(
	struct xfs_bmalloca	*ap,
	struct xfs_alloc_arg	*args,
	xfs_extlen_t		*longest)
{ … }

void
xfs_filestream_deassociate(
	struct xfs_inode	*ip)
{ … }

int
xfs_filestream_mount(
	xfs_mount_t	*mp)
{ … }

void
xfs_filestream_unmount(
	xfs_mount_t	*mp)
{ … }