// 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(xfs_dqblk_t);
}
/*
* 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,
xfs_disk_dquot_t *ddq,
xfs_dqid_t id,
uint type) /* used only during quotacheck */
{
/*
* 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 (type && ddq->d_flags != type)
return __this_address;
if (ddq->d_flags != XFS_DQ_USER &&
ddq->d_flags != XFS_DQ_PROJ &&
ddq->d_flags != XFS_DQ_GROUP)
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,
uint type) /* used only during quotacheck */
{
if (xfs_sb_version_hascrc(&mp->m_sb) &&
!uuid_equal(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid))
return __this_address;
return xfs_dquot_verify(mp, &dqb->dd_diskdq, id, type);
}
/*
* 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,
uint type)
{
/*
* Typically, a repair is only requested by quotacheck.
*/
ASSERT(id != -1);
memset(dqb, 0, sizeof(xfs_dqblk_t));
dqb->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
dqb->dd_diskdq.d_version = XFS_DQUOT_VERSION;
dqb->dd_diskdq.d_flags = type;
dqb->dd_diskdq.d_id = cpu_to_be32(id);
if (xfs_sb_version_hascrc(&mp->m_sb)) {
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_sb_version_hascrc(&mp->m_sb))
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, 0);
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,
};
