326 lines
8.0 KiB
C
326 lines
8.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* Copyright (c) 2013 Red Hat, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_quota.h"
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#include "xfs_trans.h"
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#include "xfs_qm.h"
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#include "xfs_error.h"
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int
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xfs_calc_dquots_per_chunk(
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unsigned int nbblks) /* basic block units */
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{
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ASSERT(nbblks > 0);
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return BBTOB(nbblks) / sizeof(xfs_dqblk_t);
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}
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/*
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* Do some primitive error checking on ondisk dquot data structures.
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*
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* The xfs_dqblk structure /contains/ the xfs_disk_dquot structure;
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* we verify them separately because at some points we have only the
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* smaller xfs_disk_dquot structure available.
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*/
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xfs_failaddr_t
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xfs_dquot_verify(
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struct xfs_mount *mp,
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struct xfs_disk_dquot *ddq,
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xfs_dqid_t id) /* used only during quotacheck */
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{
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__u8 ddq_type;
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/*
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* We can encounter an uninitialized dquot buffer for 2 reasons:
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* 1. If we crash while deleting the quotainode(s), and those blks got
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* used for user data. This is because we take the path of regular
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* file deletion; however, the size field of quotainodes is never
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* updated, so all the tricks that we play in itruncate_finish
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* don't quite matter.
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*
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* 2. We don't play the quota buffers when there's a quotaoff logitem.
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* But the allocation will be replayed so we'll end up with an
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* uninitialized quota block.
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*
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* This is all fine; things are still consistent, and we haven't lost
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* any quota information. Just don't complain about bad dquot blks.
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*/
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if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC))
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return __this_address;
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if (ddq->d_version != XFS_DQUOT_VERSION)
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return __this_address;
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if (ddq->d_type & ~XFS_DQTYPE_ANY)
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return __this_address;
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ddq_type = ddq->d_type & XFS_DQTYPE_REC_MASK;
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if (ddq_type != XFS_DQTYPE_USER &&
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ddq_type != XFS_DQTYPE_PROJ &&
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ddq_type != XFS_DQTYPE_GROUP)
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return __this_address;
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if ((ddq->d_type & XFS_DQTYPE_BIGTIME) &&
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!xfs_has_bigtime(mp))
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return __this_address;
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if ((ddq->d_type & XFS_DQTYPE_BIGTIME) && !ddq->d_id)
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return __this_address;
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if (id != -1 && id != be32_to_cpu(ddq->d_id))
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return __this_address;
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if (!ddq->d_id)
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return NULL;
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if (ddq->d_blk_softlimit &&
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be64_to_cpu(ddq->d_bcount) > be64_to_cpu(ddq->d_blk_softlimit) &&
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!ddq->d_btimer)
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return __this_address;
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if (ddq->d_ino_softlimit &&
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be64_to_cpu(ddq->d_icount) > be64_to_cpu(ddq->d_ino_softlimit) &&
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!ddq->d_itimer)
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return __this_address;
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if (ddq->d_rtb_softlimit &&
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be64_to_cpu(ddq->d_rtbcount) > be64_to_cpu(ddq->d_rtb_softlimit) &&
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!ddq->d_rtbtimer)
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return __this_address;
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return NULL;
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}
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xfs_failaddr_t
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xfs_dqblk_verify(
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struct xfs_mount *mp,
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struct xfs_dqblk *dqb,
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xfs_dqid_t id) /* used only during quotacheck */
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{
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if (xfs_has_crc(mp) &&
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!uuid_equal(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid))
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return __this_address;
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return xfs_dquot_verify(mp, &dqb->dd_diskdq, id);
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}
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/*
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* Do some primitive error checking on ondisk dquot data structures.
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*/
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void
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xfs_dqblk_repair(
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struct xfs_mount *mp,
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struct xfs_dqblk *dqb,
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xfs_dqid_t id,
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xfs_dqtype_t type)
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{
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/*
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* Typically, a repair is only requested by quotacheck.
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*/
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ASSERT(id != -1);
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memset(dqb, 0, sizeof(xfs_dqblk_t));
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dqb->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
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dqb->dd_diskdq.d_version = XFS_DQUOT_VERSION;
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dqb->dd_diskdq.d_type = type;
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dqb->dd_diskdq.d_id = cpu_to_be32(id);
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if (xfs_has_crc(mp)) {
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uuid_copy(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid);
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xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk),
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XFS_DQUOT_CRC_OFF);
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}
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}
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STATIC bool
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xfs_dquot_buf_verify_crc(
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struct xfs_mount *mp,
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struct xfs_buf *bp,
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bool readahead)
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{
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struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr;
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int ndquots;
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int i;
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if (!xfs_has_crc(mp))
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return true;
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/*
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* if we are in log recovery, the quota subsystem has not been
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* initialised so we have no quotainfo structure. In that case, we need
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* to manually calculate the number of dquots in the buffer.
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*/
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if (mp->m_quotainfo)
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ndquots = mp->m_quotainfo->qi_dqperchunk;
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else
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ndquots = xfs_calc_dquots_per_chunk(bp->b_length);
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for (i = 0; i < ndquots; i++, d++) {
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if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk),
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XFS_DQUOT_CRC_OFF)) {
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if (!readahead)
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xfs_buf_verifier_error(bp, -EFSBADCRC, __func__,
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d, sizeof(*d), __this_address);
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return false;
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}
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}
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return true;
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}
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STATIC xfs_failaddr_t
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xfs_dquot_buf_verify(
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struct xfs_mount *mp,
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struct xfs_buf *bp,
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bool readahead)
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{
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struct xfs_dqblk *dqb = bp->b_addr;
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xfs_failaddr_t fa;
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xfs_dqid_t id = 0;
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int ndquots;
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int i;
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/*
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* if we are in log recovery, the quota subsystem has not been
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* initialised so we have no quotainfo structure. In that case, we need
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* to manually calculate the number of dquots in the buffer.
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*/
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if (mp->m_quotainfo)
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ndquots = mp->m_quotainfo->qi_dqperchunk;
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else
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ndquots = xfs_calc_dquots_per_chunk(bp->b_length);
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/*
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* On the first read of the buffer, verify that each dquot is valid.
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* We don't know what the id of the dquot is supposed to be, just that
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* they should be increasing monotonically within the buffer. If the
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* first id is corrupt, then it will fail on the second dquot in the
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* buffer so corruptions could point to the wrong dquot in this case.
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*/
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for (i = 0; i < ndquots; i++) {
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struct xfs_disk_dquot *ddq;
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ddq = &dqb[i].dd_diskdq;
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if (i == 0)
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id = be32_to_cpu(ddq->d_id);
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fa = xfs_dqblk_verify(mp, &dqb[i], id + i);
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if (fa) {
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if (!readahead)
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xfs_buf_verifier_error(bp, -EFSCORRUPTED,
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__func__, &dqb[i],
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sizeof(struct xfs_dqblk), fa);
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return fa;
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}
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}
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return NULL;
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}
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static xfs_failaddr_t
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xfs_dquot_buf_verify_struct(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_mount;
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return xfs_dquot_buf_verify(mp, bp, false);
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}
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static void
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xfs_dquot_buf_read_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_mount;
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if (!xfs_dquot_buf_verify_crc(mp, bp, false))
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return;
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xfs_dquot_buf_verify(mp, bp, false);
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}
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/*
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* readahead errors are silent and simply leave the buffer as !done so a real
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* read will then be run with the xfs_dquot_buf_ops verifier. See
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* xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than
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* reporting the failure.
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*/
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static void
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xfs_dquot_buf_readahead_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_mount;
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if (!xfs_dquot_buf_verify_crc(mp, bp, true) ||
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xfs_dquot_buf_verify(mp, bp, true) != NULL) {
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xfs_buf_ioerror(bp, -EIO);
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bp->b_flags &= ~XBF_DONE;
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}
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}
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/*
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* we don't calculate the CRC here as that is done when the dquot is flushed to
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* the buffer after the update is done. This ensures that the dquot in the
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* buffer always has an up-to-date CRC value.
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*/
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static void
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xfs_dquot_buf_write_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_mount;
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xfs_dquot_buf_verify(mp, bp, false);
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}
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const struct xfs_buf_ops xfs_dquot_buf_ops = {
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.name = "xfs_dquot",
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.magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
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cpu_to_be16(XFS_DQUOT_MAGIC) },
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.verify_read = xfs_dquot_buf_read_verify,
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.verify_write = xfs_dquot_buf_write_verify,
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.verify_struct = xfs_dquot_buf_verify_struct,
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};
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const struct xfs_buf_ops xfs_dquot_buf_ra_ops = {
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.name = "xfs_dquot_ra",
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.magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
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cpu_to_be16(XFS_DQUOT_MAGIC) },
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.verify_read = xfs_dquot_buf_readahead_verify,
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.verify_write = xfs_dquot_buf_write_verify,
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};
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/* Convert an on-disk timer value into an incore timer value. */
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time64_t
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xfs_dquot_from_disk_ts(
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struct xfs_disk_dquot *ddq,
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__be32 dtimer)
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{
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uint32_t t = be32_to_cpu(dtimer);
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if (t != 0 && (ddq->d_type & XFS_DQTYPE_BIGTIME))
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return xfs_dq_bigtime_to_unix(t);
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return t;
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}
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/* Convert an incore timer value into an on-disk timer value. */
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__be32
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xfs_dquot_to_disk_ts(
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struct xfs_dquot *dqp,
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time64_t timer)
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{
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uint32_t t = timer;
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if (timer != 0 && (dqp->q_type & XFS_DQTYPE_BIGTIME))
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t = xfs_dq_unix_to_bigtime(timer);
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return cpu_to_be32(t);
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}
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