path: root/fs/xfs/xfs_ioctl.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_mount.h"
#include "xfs_inode.h"
#include "xfs_rtalloc.h"
#include "xfs_iwalk.h"
#include "xfs_itable.h"
#include "xfs_error.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_attr.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_fsops.h"
#include "xfs_discard.h"
#include "xfs_quota.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
#include "xfs_trans.h"
#include "xfs_btree.h"
#include <linux/fsmap.h>
#include "xfs_fsmap.h"
#include "scrub/xfs_scrub.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_health.h"
#include "xfs_reflink.h"
#include "xfs_ioctl.h"
#include "xfs_xattr.h"
#include "xfs_rtbitmap.h"
#include "xfs_file.h"
#include "xfs_exchrange.h"
#include "xfs_handle.h"

#include <linux/mount.h>
#include <linux/fileattr.h>

/* Return 0 on success or positive error */
int
xfs_fsbulkstat_one_fmt(
	struct xfs_ibulk		*breq,
	const struct xfs_bulkstat	*bstat)
{
	struct xfs_bstat		bs1;

	xfs_bulkstat_to_bstat(breq->mp, &bs1, bstat);
	if (copy_to_user(breq->ubuffer, &bs1, sizeof(bs1)))
		return -EFAULT;
	return xfs_ibulk_advance(breq, sizeof(struct xfs_bstat));
}

int
xfs_fsinumbers_fmt(
	struct xfs_ibulk		*breq,
	const struct xfs_inumbers	*igrp)
{
	struct xfs_inogrp		ig1;

	xfs_inumbers_to_inogrp(&ig1, igrp);
	if (copy_to_user(breq->ubuffer, &ig1, sizeof(struct xfs_inogrp)))
		return -EFAULT;
	return xfs_ibulk_advance(breq, sizeof(struct xfs_inogrp));
}

STATIC int
xfs_ioc_fsbulkstat(
	struct file		*file,
	unsigned int		cmd,
	void			__user *arg)
{
	struct xfs_mount	*mp = XFS_I(file_inode(file))->i_mount;
	struct xfs_fsop_bulkreq	bulkreq;
	struct xfs_ibulk	breq = {
		.mp		= mp,
		.idmap		= file_mnt_idmap(file),
		.ocount		= 0,
	};
	xfs_ino_t		lastino;
	int			error;

	/* done = 1 if there are more stats to get and if bulkstat */
	/* should be called again (unused here, but used in dmapi) */

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (xfs_is_shutdown(mp))
		return -EIO;

	if (copy_from_user(&bulkreq, arg, sizeof(struct xfs_fsop_bulkreq)))
		return -EFAULT;

	if (copy_from_user(&lastino, bulkreq.lastip, sizeof(__s64)))
		return -EFAULT;

	if (bulkreq.icount <= 0)
		return -EINVAL;

	if (bulkreq.ubuffer == NULL)
		return -EINVAL;

	breq.ubuffer = bulkreq.ubuffer;
	breq.icount = bulkreq.icount;

	/*
	 * FSBULKSTAT_SINGLE expects that *lastip contains the inode number
	 * that we want to stat.  However, FSINUMBERS and FSBULKSTAT expect
	 * that *lastip contains either zero or the number of the last inode to
	 * be examined by the previous call and return results starting with
	 * the next inode after that.  The new bulk request back end functions
	 * take the inode to start with, so we have to compute the startino
	 * parameter from lastino to maintain correct function.  lastino == 0
	 * is a special case because it has traditionally meant "first inode
	 * in filesystem".
	 */
	if (cmd == XFS_IOC_FSINUMBERS) {
		breq.startino = lastino ? lastino + 1 : 0;
		error = xfs_inumbers(&breq, xfs_fsinumbers_fmt);
		lastino = breq.startino - 1;
	} else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE) {
		breq.startino = lastino;
		breq.icount = 1;
		error = xfs_bulkstat_one(&breq, xfs_fsbulkstat_one_fmt);
	} else {	/* XFS_IOC_FSBULKSTAT */
		breq.startino = lastino ? lastino + 1 : 0;
		error = xfs_bulkstat(&breq, xfs_fsbulkstat_one_fmt);
		lastino = breq.startino - 1;
	}

	if (error)
		return error;

	if (bulkreq.lastip != NULL &&
	    copy_to_user(bulkreq.lastip, &lastino, sizeof(xfs_ino_t)))
		return -EFAULT;

	if (bulkreq.ocount != NULL &&
	    copy_to_user(bulkreq.ocount, &breq.ocount, sizeof(__s32)))
		return -EFAULT;

	return 0;
}

/* Return 0 on success or positive error */
static int
xfs_bulkstat_fmt(
	struct xfs_ibulk		*breq,
	const struct xfs_bulkstat	*bstat)
{
	if (copy_to_user(breq->ubuffer, bstat, sizeof(struct xfs_bulkstat)))
		return -EFAULT;
	return xfs_ibulk_advance(breq, sizeof(struct xfs_bulkstat));
}

/*
 * Check the incoming bulk request @hdr from userspace and initialize the
 * internal @breq bulk request appropriately.  Returns 0 if the bulk request
 * should proceed; -ECANCELED if there's nothing to do; or the usual
 * negative error code.
 */
static int
xfs_bulk_ireq_setup(
	struct xfs_mount	*mp,
	const struct xfs_bulk_ireq *hdr,
	struct xfs_ibulk	*breq,
	void __user		*ubuffer)
{
	if (hdr->icount == 0 ||
	    (hdr->flags & ~XFS_BULK_IREQ_FLAGS_ALL) ||
	    memchr_inv(hdr->reserved, 0, sizeof(hdr->reserved)))
		return -EINVAL;

	breq->startino = hdr->ino;
	breq->ubuffer = ubuffer;
	breq->icount = hdr->icount;
	breq->ocount = 0;
	breq->flags = 0;

	/*
	 * The @ino parameter is a special value, so we must look it up here.
	 * We're not allowed to have IREQ_AGNO, and we only return one inode
	 * worth of data.
	 */
	if (hdr->flags & XFS_BULK_IREQ_SPECIAL) {
		if (hdr->flags & XFS_BULK_IREQ_AGNO)
			return -EINVAL;

		switch (hdr->ino) {
		case XFS_BULK_IREQ_SPECIAL_ROOT:
			breq->startino = mp->m_sb.sb_rootino;
			break;
		default:
			return -EINVAL;
		}
		breq->icount = 1;
	}

	/*
	 * The IREQ_AGNO flag means that we only want results from a given AG.
	 * If @hdr->ino is zero, we start iterating in that AG.  If @hdr->ino is
	 * beyond the specified AG then we return no results.
	 */
	if (hdr->flags & XFS_BULK_IREQ_AGNO) {
		if (hdr->agno >= mp->m_sb.sb_agcount)
			return -EINVAL;

		if (breq->startino == 0)
			breq->startino = XFS_AGINO_TO_INO(mp, hdr->agno, 0);
		else if (XFS_INO_TO_AGNO(mp, breq->startino) < hdr->agno)
			return -EINVAL;

		breq->flags |= XFS_IBULK_SAME_AG;

		/* Asking for an inode past the end of the AG?  We're done! */
		if (XFS_INO_TO_AGNO(mp, breq->startino) > hdr->agno)
			return -ECANCELED;
	} else if (hdr->agno)
		return -EINVAL;

	/* Asking for an inode past the end of the FS?  We're done! */
	if (XFS_INO_TO_AGNO(mp, breq->startino) >= mp->m_sb.sb_agcount)
		return -ECANCELED;

	if (hdr->flags & XFS_BULK_IREQ_NREXT64)
		breq->flags |= XFS_IBULK_NREXT64;

	return 0;
}

/*
 * Update the userspace bulk request @hdr to reflect the end state of the
 * internal bulk request @breq.
 */
static void
xfs_bulk_ireq_teardown(
	struct xfs_bulk_ireq	*hdr,
	struct xfs_ibulk	*breq)
{
	hdr->ino = breq->startino;
	hdr->ocount = breq->ocount;
}

/* Handle the v5 bulkstat ioctl. */
STATIC int
xfs_ioc_bulkstat(
	struct file			*file,
	unsigned int			cmd,
	struct xfs_bulkstat_req __user	*arg)
{
	struct xfs_mount		*mp = XFS_I(file_inode(file))->i_mount;
	struct xfs_bulk_ireq		hdr;
	struct xfs_ibulk		breq = {
		.mp			= mp,
		.idmap			= file_mnt_idmap(file),
	};
	int				error;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (xfs_is_shutdown(mp))
		return -EIO;

	if (copy_from_user(&hdr, &arg->hdr, sizeof(hdr)))
		return -EFAULT;

	error = xfs_bulk_ireq_setup(mp, &hdr, &breq, arg->bulkstat);
	if (error == -ECANCELED)
		goto out_teardown;
	if (error < 0)
		return error;

	error = xfs_bulkstat(&breq, xfs_bulkstat_fmt);
	if (error)
		return error;

out_teardown:
	xfs_bulk_ireq_teardown(&hdr, &breq);
	if (copy_to_user(&arg->hdr, &hdr, sizeof(hdr)))
		return -EFAULT;

	return 0;
}

STATIC int
xfs_inumbers_fmt(
	struct xfs_ibulk		*breq,
	const struct xfs_inumbers	*igrp)
{
	if (copy_to_user(breq->ubuffer, igrp, sizeof(struct xfs_inumbers)))
		return -EFAULT;
	return xfs_ibulk_advance(breq, sizeof(struct xfs_inumbers));
}

/*