fs/xfs/libxfs/xfs_dquot_buf.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
  * Copyright (c) 2013 Red Hat, 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_quota.h"
 #include "xfs_trans.h"
 #include "xfs_qm.h"
 #include "xfs_error.h"

 int
 xfs_calc_dquots_per_chunk(
 	unsigned int		nbblks)	/* basic block units */
 {
 	ASSERT(nbblks > 0);
 	return BBTOB(nbblks) / sizeof(struct xfs_dqblk);
 }

 /*
  * Do some primitive error checking on ondisk dquot data structures.
  *
  * The xfs_dqblk structure /contains/ the xfs_disk_dquot structure;
  * we verify them separately because at some points we have only the
  * smaller xfs_disk_dquot structure available.
  */

 xfs_failaddr_t
 xfs_dquot_verify(
 	struct xfs_mount	*mp,
 	struct xfs_disk_dquot	*ddq,
 	xfs_dqid_t		id)	/* used only during quotacheck */
 {
 	__u8			ddq_type;

 	/*
 	 * We can encounter an uninitialized dquot buffer for 2 reasons:
 	 * 1. If we crash while deleting the quotainode(s), and those blks got
 	 *    used for user data. This is because we take the path of regular
 	 *    file deletion; however, the size field of quotainodes is never
 	 *    updated, so all the tricks that we play in itruncate_finish
 	 *    don't quite matter.
 	 *
 	 * 2. We don't play the quota buffers when there's a quotaoff logitem.
 	 *    But the allocation will be replayed so we'll end up with an
 	 *    uninitialized quota block.
 	 *
 	 * This is all fine; things are still consistent, and we haven't lost
 	 * any quota information. Just don't complain about bad dquot blks.
 	 */
 	if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC))
 		return __this_address;
 	if (ddq->d_version != XFS_DQUOT_VERSION)
 		return __this_address;

 	if (ddq->d_type & ~XFS_DQTYPE_ANY)
 		return __this_address;
 	ddq_type = ddq->d_type & XFS_DQTYPE_REC_MASK;
 	if (ddq_type != XFS_DQTYPE_USER &&
 	    ddq_type != XFS_DQTYPE_PROJ &&
 	    ddq_type != XFS_DQTYPE_GROUP)
 		return __this_address;

 	if ((ddq->d_type & XFS_DQTYPE_BIGTIME) &&
 	    !xfs_has_bigtime(mp))
 		return __this_address;

 	if ((ddq->d_type & XFS_DQTYPE_BIGTIME) && !ddq->d_id)
 		return __this_address;

 	if (id != -1 && id != be32_to_cpu(ddq->d_id))
 		return __this_address;

 	if (!ddq->d_id)
 		return NULL;

 	if (ddq->d_blk_softlimit &&
 	    be64_to_cpu(ddq->d_bcount) > be64_to_cpu(ddq->d_blk_softlimit) &&
 	    !ddq->d_btimer)
 		return __this_address;

 	if (ddq->d_ino_softlimit &&
 	    be64_to_cpu(ddq->d_icount) > be64_to_cpu(ddq->d_ino_softlimit) &&
 	    !ddq->d_itimer)
 		return __this_address;

 	if (ddq->d_rtb_softlimit &&
 	    be64_to_cpu(ddq->d_rtbcount) > be64_to_cpu(ddq->d_rtb_softlimit) &&
 	    !ddq->d_rtbtimer)
 		return __this_address;

 	return NULL;
 }

 xfs_failaddr_t
 xfs_dqblk_verify(
 	struct xfs_mount	*mp,
 	struct xfs_dqblk	*dqb,
 	xfs_dqid_t		id)	/* used only during quotacheck */
 {
 	if (xfs_has_crc(mp) &&
 	    !uuid_equal(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid))
 		return __this_address;

 	return xfs_dquot_verify(mp, &dqb->dd_diskdq, id);
 }

 /*
  * Do some primitive error checking on ondisk dquot data structures.
  */
 void
 xfs_dqblk_repair(
 	struct xfs_mount	*mp,
 	struct xfs_dqblk	*dqb,
 	xfs_dqid_t		id,
 	xfs_dqtype_t		type)
 {
 	/*
 	 * Typically, a repair is only requested by quotacheck.
 	 */
 	ASSERT(id != -1);
 	memset(dqb, 0, sizeof(struct xfs_dqblk));

 	dqb->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
 	dqb->dd_diskdq.d_version = XFS_DQUOT_VERSION;
 	dqb->dd_diskdq.d_type = type;
 	dqb->dd_diskdq.d_id = cpu_to_be32(id);

 	if (xfs_has_crc(mp)) {
 		uuid_copy(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid);
 		xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk),
 				 XFS_DQUOT_CRC_OFF);
 	}
 }

 STATIC bool
 xfs_dquot_buf_verify_crc(
 	struct xfs_mount	*mp,
 	struct xfs_buf		*bp,
 	bool			readahead)
 {
 	struct xfs_dqblk	*d = (struct xfs_dqblk *)bp->b_addr;
 	int			ndquots;
 	int			i;

 	if (!xfs_has_crc(mp))
 		return true;

 	/*
 	 * if we are in log recovery, the quota subsystem has not been
 	 * initialised so we have no quotainfo structure. In that case, we need
 	 * to manually calculate the number of dquots in the buffer.
 	 */
 	if (mp->m_quotainfo)
 		ndquots = mp->m_quotainfo->qi_dqperchunk;
 	else
 		ndquots = xfs_calc_dquots_per_chunk(bp->b_length);

 	for (i = 0; i < ndquots; i++, d++) {
 		if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk),
 				 XFS_DQUOT_CRC_OFF)) {
 			if (!readahead)
 				xfs_buf_verifier_error(bp, -EFSBADCRC, __func__,
 					d, sizeof(*d), __this_address);
 			return false;
 		}
 	}
 	return true;
 }

 STATIC xfs_failaddr_t
 xfs_dquot_buf_verify(
 	struct xfs_mount	*mp,
 	struct xfs_buf		*bp,
 	bool			readahead)
 {
 	struct xfs_dqblk	*dqb = bp->b_addr;
 	xfs_failaddr_t		fa;
 	xfs_dqid_t		id = 0;
 	int			ndquots;
 	int			i;

 	/*
 	 * if we are in log recovery, the quota subsystem has not been
 	 * initialised so we have no quotainfo structure. In that case, we need
 	 * to manually calculate the number of dquots in the buffer.
 	 */
 	if (mp->m_quotainfo)
 		ndquots = mp->m_quotainfo->qi_dqperchunk;
 	else
 		ndquots = xfs_calc_dquots_per_chunk(bp->b_length);

 	/*
 	 * On the first read of the buffer, verify that each dquot is valid.
 	 * We don't know what the id of the dquot is supposed to be, just that
 	 * they should be increasing monotonically within the buffer. If the
 	 * first id is corrupt, then it will fail on the second dquot in the
 	 * buffer so corruptions could point to the wrong dquot in this case.
 	 */
 	for (i = 0; i < ndquots; i++) {
 		struct xfs_disk_dquot	*ddq;

 		ddq = &dqb[i].dd_diskdq;

 		if (i == 0)
 			id = be32_to_cpu(ddq->d_id);

 		fa = xfs_dqblk_verify(mp, &dqb[i], id + i);
 		if (fa) {
 			if (!readahead)
 				xfs_buf_verifier_error(bp, -EFSCORRUPTED,
 					__func__, &dqb[i],
 					sizeof(struct xfs_dqblk), fa);
 			return fa;
 		}
 	}

 	return NULL;
 }

 static xfs_failaddr_t
 xfs_dquot_buf_verify_struct(
 	struct xfs_buf		*bp)
 {
 	struct xfs_mount	*mp = bp->b_mount;

 	return xfs_dquot_buf_verify(mp, bp, false);
 }

 static void
 xfs_dquot_buf_read_verify(
 	struct xfs_buf		*bp)
 {
 	struct xfs_mount	*mp = bp->b_mount;

 	if (!xfs_dquot_buf_verify_crc(mp, bp, false))
 		return;
 	xfs_dquot_buf_verify(mp, bp, false);
 }

 /*
  * readahead errors are silent and simply leave the buffer as !done so a real
  * read will then be run with the xfs_dquot_buf_ops verifier. See
  * xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than
  * reporting the failure.
  */
 static void
 xfs_dquot_buf_readahead_verify(
 	struct xfs_buf	*bp)
 {
 	struct xfs_mount	*mp = bp->b_mount;

 	if (!xfs_dquot_buf_verify_crc(mp, bp, true) ||
 	    xfs_dquot_buf_verify(mp, bp, true) != NULL) {
 		xfs_buf_ioerror(bp, -EIO);
 		bp->b_flags &= ~XBF_DONE;
 	}
 }

 /*
  * we don't calculate the CRC here as that is done when the dquot is flushed to
  * the buffer after the update is done. This ensures that the dquot in the
  * buffer always has an up-to-date CRC value.
  */
 static void
 xfs_dquot_buf_write_verify(
 	struct xfs_buf		*bp)
 {
 	struct xfs_mount	*mp = bp->b_mount;

 	xfs_dquot_buf_verify(mp, bp, false);
 }

 const struct xfs_buf_ops xfs_dquot_buf_ops = {
 	.name = "xfs_dquot",
 	.magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
 		     cpu_to_be16(XFS_DQUOT_MAGIC) },
 	.verify_read = xfs_dquot_buf_read_verify,
 	.verify_write = xfs_dquot_buf_write_verify,
 	.verify_struct = xfs_dquot_buf_verify_struct,
 };

 const struct xfs_buf_ops xfs_dquot_buf_ra_ops = {
 	.name = "xfs_dquot_ra",
 	.magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
 		     cpu_to_be16(XFS_DQUOT_MAGIC) },
 	.verify_read = xfs_dquot_buf_readahead_verify,
 	.verify_write = xfs_dquot_buf_write_verify,
 };

 /* Convert an on-disk timer value into an incore timer value. */
 time64_t
 xfs_dquot_from_disk_ts(
 	struct xfs_disk_dquot	*ddq,
 	__be32			dtimer)
 {
 	uint32_t		t = be32_to_cpu(dtimer);

 	if (t != 0 && (ddq->d_type & XFS_DQTYPE_BIGTIME))
 		return xfs_dq_bigtime_to_unix(t);

 	return t;
 }

 /* Convert an incore timer value into an on-disk timer value. */
 __be32
 xfs_dquot_to_disk_ts(
 	struct xfs_dquot	*dqp,
 	time64_t		timer)
 {
 	uint32_t		t = timer;

 	if (timer != 0 && (dqp->q_type & XFS_DQTYPE_BIGTIME))
 		t = xfs_dq_unix_to_bigtime(timer);

 	return cpu_to_be32(t);
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2000-2006 Silicon Graphics, Inc.
	* Copyright (c) 2013 Red Hat, 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_quota.h"
	#include "xfs_trans.h"
	#include "xfs_qm.h"
	#include "xfs_error.h"

	int
	xfs_calc_dquots_per_chunk(
	unsigned int nbblks) /* basic block units */
	{
	ASSERT(nbblks > 0);
	return BBTOB(nbblks) / sizeof(struct xfs_dqblk);
	}

	/*
	* Do some primitive error checking on ondisk dquot data structures.
	*
	* The xfs_dqblk structure /contains/ the xfs_disk_dquot structure;
	* we verify them separately because at some points we have only the
	* smaller xfs_disk_dquot structure available.
	*/

	xfs_failaddr_t
	xfs_dquot_verify(
	struct xfs_mount *mp,
	struct xfs_disk_dquot *ddq,
	xfs_dqid_t id) /* used only during quotacheck */
	{
	__u8 ddq_type;

	/*
	* We can encounter an uninitialized dquot buffer for 2 reasons:
	* 1. If we crash while deleting the quotainode(s), and those blks got
	* used for user data. This is because we take the path of regular
	* file deletion; however, the size field of quotainodes is never
	* updated, so all the tricks that we play in itruncate_finish
	* don't quite matter.
	*
	* 2. We don't play the quota buffers when there's a quotaoff logitem.
	* But the allocation will be replayed so we'll end up with an
	* uninitialized quota block.
	*
	* This is all fine; things are still consistent, and we haven't lost
	* any quota information. Just don't complain about bad dquot blks.
	*/
	if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC))
	return __this_address;
	if (ddq->d_version != XFS_DQUOT_VERSION)
	return __this_address;

	if (ddq->d_type & ~XFS_DQTYPE_ANY)
	return __this_address;
	ddq_type = ddq->d_type & XFS_DQTYPE_REC_MASK;
	if (ddq_type != XFS_DQTYPE_USER &&
	ddq_type != XFS_DQTYPE_PROJ &&
	ddq_type != XFS_DQTYPE_GROUP)
	return __this_address;

	if ((ddq->d_type & XFS_DQTYPE_BIGTIME) &&
	!xfs_has_bigtime(mp))
	return __this_address;

	if ((ddq->d_type & XFS_DQTYPE_BIGTIME) && !ddq->d_id)
	return __this_address;

	if (id != -1 && id != be32_to_cpu(ddq->d_id))
	return __this_address;

	if (!ddq->d_id)
	return NULL;

	if (ddq->d_blk_softlimit &&
	be64_to_cpu(ddq->d_bcount) > be64_to_cpu(ddq->d_blk_softlimit) &&
	!ddq->d_btimer)
	return __this_address;

	if (ddq->d_ino_softlimit &&
	be64_to_cpu(ddq->d_icount) > be64_to_cpu(ddq->d_ino_softlimit) &&
	!ddq->d_itimer)
	return __this_address;

	if (ddq->d_rtb_softlimit &&
	be64_to_cpu(ddq->d_rtbcount) > be64_to_cpu(ddq->d_rtb_softlimit) &&
	!ddq->d_rtbtimer)
	return __this_address;

	return NULL;
	}

	xfs_failaddr_t
	xfs_dqblk_verify(
	struct xfs_mount *mp,
	struct xfs_dqblk *dqb,
	xfs_dqid_t id) /* used only during quotacheck */
	{
	if (xfs_has_crc(mp) &&
	!uuid_equal(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid))
	return __this_address;

	return xfs_dquot_verify(mp, &dqb->dd_diskdq, id);
	}

	/*
	* Do some primitive error checking on ondisk dquot data structures.
	*/
	void
	xfs_dqblk_repair(
	struct xfs_mount *mp,
	struct xfs_dqblk *dqb,
	xfs_dqid_t id,
	xfs_dqtype_t type)
	{
	/*
	* Typically, a repair is only requested by quotacheck.
	*/
	ASSERT(id != -1);
	memset(dqb, 0, sizeof(struct xfs_dqblk));

	dqb->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
	dqb->dd_diskdq.d_version = XFS_DQUOT_VERSION;
	dqb->dd_diskdq.d_type = type;
	dqb->dd_diskdq.d_id = cpu_to_be32(id);

	if (xfs_has_crc(mp)) {
	uuid_copy(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid);
	xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk),
	XFS_DQUOT_CRC_OFF);
	}
	}

	STATIC bool
	xfs_dquot_buf_verify_crc(
	struct xfs_mount *mp,
	struct xfs_buf *bp,
	bool readahead)
	{
	struct xfs_dqblk d = (struct xfs_dqblk )bp->b_addr;
	int ndquots;
	int i;

	if (!xfs_has_crc(mp))
	return true;

	/*
	* if we are in log recovery, the quota subsystem has not been
	* initialised so we have no quotainfo structure. In that case, we need
	* to manually calculate the number of dquots in the buffer.
	*/
	if (mp->m_quotainfo)
	ndquots = mp->m_quotainfo->qi_dqperchunk;
	else
	ndquots = xfs_calc_dquots_per_chunk(bp->b_length);

	for (i = 0; i < ndquots; i++, d++) {
	if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk),
	XFS_DQUOT_CRC_OFF)) {
	if (!readahead)
	xfs_buf_verifier_error(bp, -EFSBADCRC, __func__,
	d, sizeof(*d), __this_address);
	return false;
	}
	}
	return true;
	}

	STATIC xfs_failaddr_t
	xfs_dquot_buf_verify(
	struct xfs_mount *mp,
	struct xfs_buf *bp,
	bool readahead)
	{
	struct xfs_dqblk *dqb = bp->b_addr;
	xfs_failaddr_t fa;
	xfs_dqid_t id = 0;
	int ndquots;
	int i;

	/*
	* if we are in log recovery, the quota subsystem has not been
	* initialised so we have no quotainfo structure. In that case, we need
	* to manually calculate the number of dquots in the buffer.
	*/
	if (mp->m_quotainfo)
	ndquots = mp->m_quotainfo->qi_dqperchunk;
	else
	ndquots = xfs_calc_dquots_per_chunk(bp->b_length);

	/*
	* On the first read of the buffer, verify that each dquot is valid.
	* We don't know what the id of the dquot is supposed to be, just that
	* they should be increasing monotonically within the buffer. If the
	* first id is corrupt, then it will fail on the second dquot in the
	* buffer so corruptions could point to the wrong dquot in this case.
	*/
	for (i = 0; i < ndquots; i++) {
	struct xfs_disk_dquot *ddq;

	ddq = &dqb[i].dd_diskdq;

	if (i == 0)
	id = be32_to_cpu(ddq->d_id);

	fa = xfs_dqblk_verify(mp, &dqb[i], id + i);
	if (fa) {
	if (!readahead)
	xfs_buf_verifier_error(bp, -EFSCORRUPTED,
	__func__, &dqb[i],
	sizeof(struct xfs_dqblk), fa);
	return fa;
	}
	}

	return NULL;
	}

	static xfs_failaddr_t
	xfs_dquot_buf_verify_struct(
	struct xfs_buf *bp)
	{
	struct xfs_mount *mp = bp->b_mount;

	return xfs_dquot_buf_verify(mp, bp, false);
	}

	static void
	xfs_dquot_buf_read_verify(
	struct xfs_buf *bp)
	{
	struct xfs_mount *mp = bp->b_mount;

	if (!xfs_dquot_buf_verify_crc(mp, bp, false))
	return;
	xfs_dquot_buf_verify(mp, bp, false);
	}

	/*
	* readahead errors are silent and simply leave the buffer as !done so a real
	* read will then be run with the xfs_dquot_buf_ops verifier. See
	* xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than
	* reporting the failure.
	*/
	static void
	xfs_dquot_buf_readahead_verify(
	struct xfs_buf *bp)
	{
	struct xfs_mount *mp = bp->b_mount;

	if (!xfs_dquot_buf_verify_crc(mp, bp, true) \|\|
	xfs_dquot_buf_verify(mp, bp, true) != NULL) {
	xfs_buf_ioerror(bp, -EIO);
	bp->b_flags &= ~XBF_DONE;
	}
	}

	/*
	* we don't calculate the CRC here as that is done when the dquot is flushed to
	* the buffer after the update is done. This ensures that the dquot in the
	* buffer always has an up-to-date CRC value.
	*/
	static void
	xfs_dquot_buf_write_verify(
	struct xfs_buf *bp)
	{
	struct xfs_mount *mp = bp->b_mount;

	xfs_dquot_buf_verify(mp, bp, false);
	}

	const struct xfs_buf_ops xfs_dquot_buf_ops = {
	.name = "xfs_dquot",
	.magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
	cpu_to_be16(XFS_DQUOT_MAGIC) },
	.verify_read = xfs_dquot_buf_read_verify,
	.verify_write = xfs_dquot_buf_write_verify,
	.verify_struct = xfs_dquot_buf_verify_struct,
	};

	const struct xfs_buf_ops xfs_dquot_buf_ra_ops = {
	.name = "xfs_dquot_ra",
	.magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
	cpu_to_be16(XFS_DQUOT_MAGIC) },
	.verify_read = xfs_dquot_buf_readahead_verify,
	.verify_write = xfs_dquot_buf_write_verify,
	};

	/* Convert an on-disk timer value into an incore timer value. */
	time64_t
	xfs_dquot_from_disk_ts(
	struct xfs_disk_dquot *ddq,
	__be32 dtimer)
	{
	uint32_t t = be32_to_cpu(dtimer);

	if (t != 0 && (ddq->d_type & XFS_DQTYPE_BIGTIME))
	return xfs_dq_bigtime_to_unix(t);

	return t;
	}

	/* Convert an incore timer value into an on-disk timer value. */
	__be32
	xfs_dquot_to_disk_ts(
	struct xfs_dquot *dqp,
	time64_t timer)
	{
	uint32_t t = timer;

	if (timer != 0 && (dqp->q_type & XFS_DQTYPE_BIGTIME))
	t = xfs_dq_unix_to_bigtime(timer);

	return cpu_to_be32(t);
	}