linux/fs/xfs/xfs_fsops.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2005 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_sb.h"
#include "xfs_mount.h"
#include "xfs_trans.h"
#include "xfs_error.h"
#include "xfs_alloc.h"
#include "xfs_fsops.h"
#include "xfs_trans_space.h"
#include "xfs_log.h"
#include "xfs_log_priv.h"
#include "xfs_ag.h"
#include "xfs_ag_resv.h"
#include "xfs_trace.h"

/*
 * Write new AG headers to disk. Non-transactional, but need to be
 * written and completed prior to the growfs transaction being logged.
 * To do this, we use a delayed write buffer list and wait for
 * submission and IO completion of the list as a whole. This allows the
 * IO subsystem to merge all the AG headers in a single AG into a single
 * IO and hide most of the latency of the IO from us.
 *
 * This also means that if we get an error whilst building the buffer
 * list to write, we can cancel the entire list without having written
 * anything.
 */
static int
xfs_resizefs_init_new_ags(
	struct xfs_trans	*tp,
	struct aghdr_init_data	*id,
	xfs_agnumber_t		oagcount,
	xfs_agnumber_t		nagcount,
	xfs_rfsblock_t		delta,
	struct xfs_perag	*last_pag,
	bool			*lastag_extended)
{ … }

/*
 * growfs operations
 */
static int
xfs_growfs_data_private(
	struct xfs_mount	*mp,		/* mount point for filesystem */
	struct xfs_growfs_data	*in)		/* growfs data input struct */
{ … }

static int
xfs_growfs_log_private(
	struct xfs_mount	*mp,	/* mount point for filesystem */
	struct xfs_growfs_log	*in)	/* growfs log input struct */
{ … }

static int
xfs_growfs_imaxpct(
	struct xfs_mount	*mp,
	__u32			imaxpct)
{ … }

/*
 * protected versions of growfs function acquire and release locks on the mount
 * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
 * XFS_IOC_FSGROWFSRT
 */
int
xfs_growfs_data(
	struct xfs_mount	*mp,
	struct xfs_growfs_data	*in)
{ … }

int
xfs_growfs_log(
	xfs_mount_t		*mp,
	struct xfs_growfs_log	*in)
{ … }

/*
 * Reserve the requested number of blocks if available. Otherwise return
 * as many as possible to satisfy the request. The actual number
 * reserved are returned in outval.
 */
int
xfs_reserve_blocks(
	struct xfs_mount	*mp,
	uint64_t		request)
{ … }

int
xfs_fs_goingdown(
	xfs_mount_t	*mp,
	uint32_t	inflags)
{ … }

/*
 * Force a shutdown of the filesystem instantly while keeping the filesystem
 * consistent. We don't do an unmount here; just shutdown the shop, make sure
 * that absolutely nothing persistent happens to this filesystem after this
 * point.
 *
 * The shutdown state change is atomic, resulting in the first and only the
 * first shutdown call processing the shutdown. This means we only shutdown the
 * log once as it requires, and we don't spam the logs when multiple concurrent
 * shutdowns race to set the shutdown flags.
 */
void
xfs_do_force_shutdown(
	struct xfs_mount *mp,
	uint32_t	flags,
	char		*fname,
	int		lnnum)
{ … }

/*
 * Reserve free space for per-AG metadata.
 */
int
xfs_fs_reserve_ag_blocks(
	struct xfs_mount	*mp)
{ … }

/*
 * Free space reserved for per-AG metadata.
 */
void
xfs_fs_unreserve_ag_blocks(
	struct xfs_mount	*mp)
{ … }