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linux/fs/xfs/libxfs/xfs_sb.c
Dave Chinner f0f5f65806 xfs: validate v5 feature fields 
We don't check that the v4 feature flags taht v5 requires to be set
are actually set anywhere. Do this check when we see that the
filesystem is a v5 filesystem.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Dave Chinner <david@fromorbit.com>
2022-05-04 12:17:18 +10:00

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// 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_bit.h"
#include "xfs_sb.h"
#include "xfs_mount.h"
#include "xfs_ialloc.h"
#include "xfs_alloc.h"
#include "xfs_error.h"
#include "xfs_trans.h"
#include "xfs_buf_item.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_log.h"
#include "xfs_rmap_btree.h"
#include "xfs_refcount_btree.h"
#include "xfs_da_format.h"
#include "xfs_health.h"
#include "xfs_ag.h"
/*
* Physical superblock buffer manipulations. Shared with libxfs in userspace.
*/
/*
* Check that all the V4 feature bits that the V5 filesystem format requires are
* correctly set.
*/
static bool
xfs_sb_validate_v5_features(
struct xfs_sb *sbp)
{
/* We must not have any unknown V4 feature bits set */
if (sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS)
return false;
/*
* The CRC bit is considered an invalid V4 flag, so we have to add it
* manually to the OKBITS mask.
*/
if (sbp->sb_features2 & ~(XFS_SB_VERSION2_OKBITS |
XFS_SB_VERSION2_CRCBIT))
return false;
/* Now check all the required V4 feature flags are set. */
#define V5_VERS_FLAGS (XFS_SB_VERSION_NLINKBIT | \
XFS_SB_VERSION_ALIGNBIT | \
XFS_SB_VERSION_LOGV2BIT | \
XFS_SB_VERSION_EXTFLGBIT | \
XFS_SB_VERSION_DIRV2BIT | \
XFS_SB_VERSION_MOREBITSBIT)
#define V5_FEAT_FLAGS (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
XFS_SB_VERSION2_ATTR2BIT | \
XFS_SB_VERSION2_PROJID32BIT | \
XFS_SB_VERSION2_CRCBIT)
if ((sbp->sb_versionnum & V5_VERS_FLAGS) != V5_VERS_FLAGS)
return false;
if ((sbp->sb_features2 & V5_FEAT_FLAGS) != V5_FEAT_FLAGS)
return false;
return true;
}
/*
* We support all XFS versions newer than a v4 superblock with V2 directories.
*/
bool
xfs_sb_good_version(
struct xfs_sb *sbp)
{
/*
* All v5 filesystems are supported, but we must check that all the
* required v4 feature flags are enabled correctly as the code checks
* those flags and not for v5 support.
*/
if (xfs_sb_is_v5(sbp))
return xfs_sb_validate_v5_features(sbp);
/* We must not have any unknown v4 feature bits set */
if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) ||
((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
(sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
return false;
/* versions prior to v4 are not supported */
if (XFS_SB_VERSION_NUM(sbp) < XFS_SB_VERSION_4)
return false;
/* V4 filesystems need v2 directories and unwritten extents */
if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
return false;
if (!(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT))
return false;
/* It's a supported v4 filesystem */
return true;
}
uint64_t
xfs_sb_version_to_features(
struct xfs_sb *sbp)
{
uint64_t features = 0;
/* optional V4 features */
if (sbp->sb_rblocks > 0)
features |= XFS_FEAT_REALTIME;
if (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT)
features |= XFS_FEAT_NLINK;
if (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT)
features |= XFS_FEAT_ATTR;
if (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT)
features |= XFS_FEAT_QUOTA;
if (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT)
features |= XFS_FEAT_ALIGN;
if (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT)
features |= XFS_FEAT_LOGV2;
if (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT)
features |= XFS_FEAT_DALIGN;
if (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT)
features |= XFS_FEAT_EXTFLG;
if (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT)
features |= XFS_FEAT_SECTOR;
if (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT)
features |= XFS_FEAT_ASCIICI;
if (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) {
if (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT)
features |= XFS_FEAT_LAZYSBCOUNT;
if (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT)
features |= XFS_FEAT_ATTR2;
if (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT)
features |= XFS_FEAT_PROJID32;
if (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)
features |= XFS_FEAT_FTYPE;
}
if (!xfs_sb_is_v5(sbp))
return features;
/* Always on V5 features */
features |= XFS_FEAT_ALIGN | XFS_FEAT_LOGV2 | XFS_FEAT_EXTFLG |
XFS_FEAT_LAZYSBCOUNT | XFS_FEAT_ATTR2 | XFS_FEAT_PROJID32 |
XFS_FEAT_V3INODES | XFS_FEAT_CRC | XFS_FEAT_PQUOTINO;
/* Optional V5 features */
if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT)
features |= XFS_FEAT_FINOBT;
if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT)
features |= XFS_FEAT_RMAPBT;
if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK)
features |= XFS_FEAT_REFLINK;
if (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_INOBTCNT)
features |= XFS_FEAT_INOBTCNT;
if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_FTYPE)
features |= XFS_FEAT_FTYPE;
if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES)
features |= XFS_FEAT_SPINODES;
if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID)
features |= XFS_FEAT_META_UUID;
if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_BIGTIME)
features |= XFS_FEAT_BIGTIME;
if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR)
features |= XFS_FEAT_NEEDSREPAIR;
if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_NREXT64)
features |= XFS_FEAT_NREXT64;
return features;
}
/* Check all the superblock fields we care about when reading one in. */
STATIC int
xfs_validate_sb_read(
struct xfs_mount *mp,
struct xfs_sb *sbp)
{
if (!xfs_sb_is_v5(sbp))
return 0;
/*
* Version 5 superblock feature mask validation. Reject combinations
* the kernel cannot support up front before checking anything else.
*/
if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) {
xfs_warn(mp,
"Superblock has unknown compatible features (0x%x) enabled.",
(sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN));
xfs_warn(mp,
"Using a more recent kernel is recommended.");
}
if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
xfs_alert(mp,
"Superblock has unknown read-only compatible features (0x%x) enabled.",
(sbp->sb_features_ro_compat &
XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
if (!xfs_is_readonly(mp)) {
xfs_warn(mp,
"Attempted to mount read-only compatible filesystem read-write.");
xfs_warn(mp,
"Filesystem can only be safely mounted read only.");
return -EINVAL;
}
}
if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
xfs_warn(mp,
"Superblock has unknown incompatible features (0x%x) enabled.",
(sbp->sb_features_incompat &
XFS_SB_FEAT_INCOMPAT_UNKNOWN));
xfs_warn(mp,
"Filesystem cannot be safely mounted by this kernel.");
return -EINVAL;
}
return 0;
}
/* Check all the superblock fields we care about when writing one out. */
STATIC int
xfs_validate_sb_write(
struct xfs_mount *mp,
struct xfs_buf *bp,
struct xfs_sb *sbp)
{
/*
* Carry out additional sb summary counter sanity checks when we write
* the superblock. We skip this in the read validator because there
* could be newer superblocks in the log and if the values are garbage
* even after replay we'll recalculate them at the end of log mount.
*
* mkfs has traditionally written zeroed counters to inprogress and
* secondary superblocks, so allow this usage to continue because
* we never read counters from such superblocks.
*/
if (xfs_buf_daddr(bp) == XFS_SB_DADDR && !sbp->sb_inprogress &&
(sbp->sb_fdblocks > sbp->sb_dblocks ||
!xfs_verify_icount(mp, sbp->sb_icount) ||
sbp->sb_ifree > sbp->sb_icount)) {
xfs_warn(mp, "SB summary counter sanity check failed");
return -EFSCORRUPTED;
}
if (!xfs_sb_is_v5(sbp))
return 0;
/*
* Version 5 superblock feature mask validation. Reject combinations
* the kernel cannot support since we checked for unsupported bits in
* the read verifier, which means that memory is corrupt.
*/
if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) {
xfs_warn(mp,
"Corruption detected in superblock compatible features (0x%x)!",
(sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN));
return -EFSCORRUPTED;
}
if (xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
xfs_alert(mp,
"Corruption detected in superblock read-only compatible features (0x%x)!",
(sbp->sb_features_ro_compat &
XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
return -EFSCORRUPTED;
}
if (xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_UNKNOWN)) {
xfs_warn(mp,
"Corruption detected in superblock incompatible features (0x%x)!",
(sbp->sb_features_incompat &
XFS_SB_FEAT_INCOMPAT_UNKNOWN));
return -EFSCORRUPTED;
}
if (xfs_sb_has_incompat_log_feature(sbp,
XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) {
xfs_warn(mp,
"Corruption detected in superblock incompatible log features (0x%x)!",
(sbp->sb_features_log_incompat &
XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN));
return -EFSCORRUPTED;
}
/*
* We can't read verify the sb LSN because the read verifier is called
* before the log is allocated and processed. We know the log is set up
* before write verifier calls, so check it here.
*/
if (!xfs_log_check_lsn(mp, sbp->sb_lsn))
return -EFSCORRUPTED;
return 0;
}
/* Check the validity of the SB. */
STATIC int
xfs_validate_sb_common(
struct xfs_mount *mp,
struct xfs_buf *bp,
struct xfs_sb *sbp)
{
struct xfs_dsb *dsb = bp->b_addr;
uint32_t agcount = 0;
uint32_t rem;
bool has_dalign;
if (!xfs_verify_magic(bp, dsb->sb_magicnum)) {
xfs_warn(mp,
"Superblock has bad magic number 0x%x. Not an XFS filesystem?",
be32_to_cpu(dsb->sb_magicnum));
return -EWRONGFS;
}
if (!xfs_sb_good_version(sbp)) {
xfs_warn(mp,
"Superblock has unknown features enabled or corrupted feature masks.");
return -EWRONGFS;
}
/*
* Validate feature flags and state
*/
if (xfs_sb_is_v5(sbp)) {
if (sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) {
xfs_notice(mp,
"Block size (%u bytes) too small for Version 5 superblock (minimum %d bytes)",
sbp->sb_blocksize, XFS_MIN_CRC_BLOCKSIZE);
return -EFSCORRUPTED;
}
/* V5 has a separate project quota inode */
if (sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
xfs_notice(mp,
"Version 5 of Super block has XFS_OQUOTA bits.");
return -EFSCORRUPTED;
}
/*
* Full inode chunks must be aligned to inode chunk size when
* sparse inodes are enabled to support the sparse chunk
* allocation algorithm and prevent overlapping inode records.
*/
if (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_SPINODES) {
uint32_t align;
align = XFS_INODES_PER_CHUNK * sbp->sb_inodesize
>> sbp->sb_blocklog;
if (sbp->sb_inoalignmt != align) {
xfs_warn(mp,
"Inode block alignment (%u) must match chunk size (%u) for sparse inodes.",
sbp->sb_inoalignmt, align);
return -EINVAL;
}
}
} else if (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
xfs_notice(mp,
"Superblock earlier than Version 5 has XFS_{P|G}QUOTA_{ENFD|CHKD} bits.");
return -EFSCORRUPTED;
}
if (unlikely(
sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
xfs_warn(mp,
"filesystem is marked as having an external log; "
"specify logdev on the mount command line.");
return -EINVAL;
}
if (unlikely(
sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
xfs_warn(mp,
"filesystem is marked as having an internal log; "
"do not specify logdev on the mount command line.");
return -EINVAL;
}
/* Compute agcount for this number of dblocks and agblocks */
if (sbp->sb_agblocks) {
agcount = div_u64_rem(sbp->sb_dblocks, sbp->sb_agblocks, &rem);
if (rem)
agcount++;
}
/*
* More sanity checking. Most of these were stolen directly from
* xfs_repair.
*/
if (unlikely(
sbp->sb_agcount <= 0 ||
sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
sbp->sb_sectsize != (1 << sbp->sb_sectlog) ||
sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
sbp->sb_blocksize != (1 << sbp->sb_blocklog) ||
sbp->sb_dirblklog + sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
sbp->sb_inodelog < XFS_DINODE_MIN_LOG ||
sbp->sb_inodelog > XFS_DINODE_MAX_LOG ||
sbp->sb_inodesize != (1 << sbp->sb_inodelog) ||
sbp->sb_logsunit > XLOG_MAX_RECORD_BSIZE ||
sbp->sb_inopblock != howmany(sbp->sb_blocksize,sbp->sb_inodesize) ||
XFS_FSB_TO_B(mp, sbp->sb_agblocks) < XFS_MIN_AG_BYTES ||
XFS_FSB_TO_B(mp, sbp->sb_agblocks) > XFS_MAX_AG_BYTES ||
sbp->sb_agblklog != xfs_highbit32(sbp->sb_agblocks - 1) + 1 ||
agcount == 0 || agcount != sbp->sb_agcount ||
(sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) ||
(sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
(sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
(sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) ||
sbp->sb_dblocks == 0 ||
sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) ||
sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp) ||
sbp->sb_shared_vn != 0)) {
xfs_notice(mp, "SB sanity check failed");
return -EFSCORRUPTED;
}
/* Validate the realtime geometry; stolen from xfs_repair */
if (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE ||
sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) {
xfs_notice(mp,
"realtime extent sanity check failed");
return -EFSCORRUPTED;
}
if (sbp->sb_rblocks == 0) {
if (sbp->sb_rextents != 0 || sbp->sb_rbmblocks != 0 ||
sbp->sb_rextslog != 0 || sbp->sb_frextents != 0) {
xfs_notice(mp,
"realtime zeroed geometry check failed");
return -EFSCORRUPTED;
}
} else {
uint64_t rexts;
uint64_t rbmblocks;
rexts = div_u64(sbp->sb_rblocks, sbp->sb_rextsize);
rbmblocks = howmany_64(sbp->sb_rextents,
NBBY * sbp->sb_blocksize);
if (sbp->sb_rextents != rexts ||
sbp->sb_rextslog != xfs_highbit32(sbp->sb_rextents) ||
sbp->sb_rbmblocks != rbmblocks) {
xfs_notice(mp,
"realtime geometry sanity check failed");
return -EFSCORRUPTED;
}
}
/*
* Either (sb_unit and !hasdalign) or (!sb_unit and hasdalign)
* would imply the image is corrupted.
*/
has_dalign = sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT;
if (!!sbp->sb_unit ^ has_dalign) {
xfs_notice(mp, "SB stripe alignment sanity check failed");
return -EFSCORRUPTED;
}
if (!xfs_validate_stripe_geometry(mp, XFS_FSB_TO_B(mp, sbp->sb_unit),
XFS_FSB_TO_B(mp, sbp->sb_width), 0, false))
return -EFSCORRUPTED;
/*
* Currently only very few inode sizes are supported.
*/
switch (sbp->sb_inodesize) {
case 256:
case 512:
case 1024:
case 2048:
break;
default:
xfs_warn(mp, "inode size of %d bytes not supported",
sbp->sb_inodesize);
return -ENOSYS;
}
return 0;
}
void
xfs_sb_quota_from_disk(struct xfs_sb *sbp)
{
/*
* older mkfs doesn't initialize quota inodes to NULLFSINO. This
* leads to in-core values having two different values for a quota
* inode to be invalid: 0 and NULLFSINO. Change it to a single value
* NULLFSINO.
*
* Note that this change affect only the in-core values. These
* values are not written back to disk unless any quota information
* is written to the disk. Even in that case, sb_pquotino field is
* not written to disk unless the superblock supports pquotino.
*/
if (sbp->sb_uquotino == 0)
sbp->sb_uquotino = NULLFSINO;
if (sbp->sb_gquotino == 0)
sbp->sb_gquotino = NULLFSINO;
if (sbp->sb_pquotino == 0)
sbp->sb_pquotino = NULLFSINO;
/*
* We need to do these manipilations only if we are working
* with an older version of on-disk superblock.
*/
if (xfs_sb_is_v5(sbp))
return;
if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
if (sbp->sb_qflags & XFS_OQUOTA_CHKD)
sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
if (sbp->sb_qflags & XFS_PQUOTA_ACCT &&
sbp->sb_gquotino != NULLFSINO) {
/*
* In older version of superblock, on-disk superblock only
* has sb_gquotino, and in-core superblock has both sb_gquotino
* and sb_pquotino. But, only one of them is supported at any
* point of time. So, if PQUOTA is set in disk superblock,
* copy over sb_gquotino to sb_pquotino. The NULLFSINO test
* above is to make sure we don't do this twice and wipe them
* both out!
*/
sbp->sb_pquotino = sbp->sb_gquotino;
sbp->sb_gquotino = NULLFSINO;
}
}
static void
__xfs_sb_from_disk(
struct xfs_sb *to,
struct xfs_dsb *from,
bool convert_xquota)
{
to->sb_magicnum = be32_to_cpu(from->sb_magicnum);
to->sb_blocksize = be32_to_cpu(from->sb_blocksize);
to->sb_dblocks = be64_to_cpu(from->sb_dblocks);
to->sb_rblocks = be64_to_cpu(from->sb_rblocks);
to->sb_rextents = be64_to_cpu(from->sb_rextents);
memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
to->sb_logstart = be64_to_cpu(from->sb_logstart);
to->sb_rootino = be64_to_cpu(from->sb_rootino);
to->sb_rbmino = be64_to_cpu(from->sb_rbmino);
to->sb_rsumino = be64_to_cpu(from->sb_rsumino);
to->sb_rextsize = be32_to_cpu(from->sb_rextsize);
to->sb_agblocks = be32_to_cpu(from->sb_agblocks);
to->sb_agcount = be32_to_cpu(from->sb_agcount);
to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks);
to->sb_logblocks = be32_to_cpu(from->sb_logblocks);
to->sb_versionnum = be16_to_cpu(from->sb_versionnum);
to->sb_sectsize = be16_to_cpu(from->sb_sectsize);
to->sb_inodesize = be16_to_cpu(from->sb_inodesize);
to->sb_inopblock = be16_to_cpu(from->sb_inopblock);
memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
to->sb_blocklog = from->sb_blocklog;
to->sb_sectlog = from->sb_sectlog;
to->sb_inodelog = from->sb_inodelog;
to->sb_inopblog = from->sb_inopblog;
to->sb_agblklog = from->sb_agblklog;
to->sb_rextslog = from->sb_rextslog;
to->sb_inprogress = from->sb_inprogress;
to->sb_imax_pct = from->sb_imax_pct;
to->sb_icount = be64_to_cpu(from->sb_icount);
to->sb_ifree = be64_to_cpu(from->sb_ifree);
to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks);
to->sb_frextents = be64_to_cpu(from->sb_frextents);
to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
to->sb_qflags = be16_to_cpu(from->sb_qflags);
to->sb_flags = from->sb_flags;
to->sb_shared_vn = from->sb_shared_vn;
to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
to->sb_unit = be32_to_cpu(from->sb_unit);
to->sb_width = be32_to_cpu(from->sb_width);
to->sb_dirblklog = from->sb_dirblklog;
to->sb_logsectlog = from->sb_logsectlog;
to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize);
to->sb_logsunit = be32_to_cpu(from->sb_logsunit);
to->sb_features2 = be32_to_cpu(from->sb_features2);
to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
to->sb_features_compat = be32_to_cpu(from->sb_features_compat);
to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat);
to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat);
to->sb_features_log_incompat =
be32_to_cpu(from->sb_features_log_incompat);
/* crc is only used on disk, not in memory; just init to 0 here. */
to->sb_crc = 0;
to->sb_spino_align = be32_to_cpu(from->sb_spino_align);
to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
to->sb_lsn = be64_to_cpu(from->sb_lsn);
/*
* sb_meta_uuid is only on disk if it differs from sb_uuid and the
* feature flag is set; if not set we keep it only in memory.
*/
if (xfs_sb_is_v5(to) &&
(to->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID))
uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
else
uuid_copy(&to->sb_meta_uuid, &from->sb_uuid);
/* Convert on-disk flags to in-memory flags? */
if (convert_xquota)
xfs_sb_quota_from_disk(to);
}
void
xfs_sb_from_disk(
struct xfs_sb *to,
struct xfs_dsb *from)
{
__xfs_sb_from_disk(to, from, true);
}
static void
xfs_sb_quota_to_disk(
struct xfs_dsb *to,
struct xfs_sb *from)
{
uint16_t qflags = from->sb_qflags;
to->sb_uquotino = cpu_to_be64(from->sb_uquotino);
/*
* The in-memory superblock quota state matches the v5 on-disk format so
* just write them out and return
*/
if (xfs_sb_is_v5(from)) {
to->sb_qflags = cpu_to_be16(from->sb_qflags);
to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
to->sb_pquotino = cpu_to_be64(from->sb_pquotino);
return;
}
/*
* For older superblocks (v4), the in-core version of sb_qflags do not
* have XFS_OQUOTA_* flags, whereas the on-disk version does. So,
* convert incore XFS_{PG}QUOTA_* flags to on-disk XFS_OQUOTA_* flags.
*/
qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
if (from->sb_qflags &
(XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
qflags |= XFS_OQUOTA_ENFD;
if (from->sb_qflags &
(XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
qflags |= XFS_OQUOTA_CHKD;
to->sb_qflags = cpu_to_be16(qflags);
/*
* GQUOTINO and PQUOTINO cannot be used together in versions
* of superblock that do not have pquotino. from->sb_flags
* tells us which quota is active and should be copied to
* disk. If neither are active, we should NULL the inode.
*
* In all cases, the separate pquotino must remain 0 because it
* is beyond the "end" of the valid non-pquotino superblock.
*/
if (from->sb_qflags & XFS_GQUOTA_ACCT)
to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
else if (from->sb_qflags & XFS_PQUOTA_ACCT)
to->sb_gquotino = cpu_to_be64(from->sb_pquotino);
else {
/*
* We can't rely on just the fields being logged to tell us
* that it is safe to write NULLFSINO - we should only do that
* if quotas are not actually enabled. Hence only write
* NULLFSINO if both in-core quota inodes are NULL.
*/
if (from->sb_gquotino == NULLFSINO &&
from->sb_pquotino == NULLFSINO)
to->sb_gquotino = cpu_to_be64(NULLFSINO);
}
to->sb_pquotino = 0;
}
void
xfs_sb_to_disk(
struct xfs_dsb *to,
struct xfs_sb *from)
{
xfs_sb_quota_to_disk(to, from);
to->sb_magicnum = cpu_to_be32(from->sb_magicnum);
to->sb_blocksize = cpu_to_be32(from->sb_blocksize);
to->sb_dblocks = cpu_to_be64(from->sb_dblocks);
to->sb_rblocks = cpu_to_be64(from->sb_rblocks);
to->sb_rextents = cpu_to_be64(from->sb_rextents);
memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid));
to->sb_logstart = cpu_to_be64(from->sb_logstart);
to->sb_rootino = cpu_to_be64(from->sb_rootino);
to->sb_rbmino = cpu_to_be64(from->sb_rbmino);
to->sb_rsumino = cpu_to_be64(from->sb_rsumino);
to->sb_rextsize = cpu_to_be32(from->sb_rextsize);
to->sb_agblocks = cpu_to_be32(from->sb_agblocks);
to->sb_agcount = cpu_to_be32(from->sb_agcount);
to->sb_rbmblocks = cpu_to_be32(from->sb_rbmblocks);
to->sb_logblocks = cpu_to_be32(from->sb_logblocks);
to->sb_versionnum = cpu_to_be16(from->sb_versionnum);
to->sb_sectsize = cpu_to_be16(from->sb_sectsize);
to->sb_inodesize = cpu_to_be16(from->sb_inodesize);
to->sb_inopblock = cpu_to_be16(from->sb_inopblock);
memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname));
to->sb_blocklog = from->sb_blocklog;
to->sb_sectlog = from->sb_sectlog;
to->sb_inodelog = from->sb_inodelog;
to->sb_inopblog = from->sb_inopblog;
to->sb_agblklog = from->sb_agblklog;
to->sb_rextslog = from->sb_rextslog;
to->sb_inprogress = from->sb_inprogress;
to->sb_imax_pct = from->sb_imax_pct;
to->sb_icount = cpu_to_be64(from->sb_icount);
to->sb_ifree = cpu_to_be64(from->sb_ifree);
to->sb_fdblocks = cpu_to_be64(from->sb_fdblocks);
to->sb_frextents = cpu_to_be64(from->sb_frextents);
to->sb_flags = from->sb_flags;
to->sb_shared_vn = from->sb_shared_vn;
to->sb_inoalignmt = cpu_to_be32(from->sb_inoalignmt);
to->sb_unit = cpu_to_be32(from->sb_unit);
to->sb_width = cpu_to_be32(from->sb_width);
to->sb_dirblklog = from->sb_dirblklog;
to->sb_logsectlog = from->sb_logsectlog;
to->sb_logsectsize = cpu_to_be16(from->sb_logsectsize);
to->sb_logsunit = cpu_to_be32(from->sb_logsunit);
/*
* We need to ensure that bad_features2 always matches features2.
* Hence we enforce that here rather than having to remember to do it
* everywhere else that updates features2.
*/
from->sb_bad_features2 = from->sb_features2;
to->sb_features2 = cpu_to_be32(from->sb_features2);
to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2);
if (!xfs_sb_is_v5(from))
return;
to->sb_features_compat = cpu_to_be32(from->sb_features_compat);
to->sb_features_ro_compat =
cpu_to_be32(from->sb_features_ro_compat);
to->sb_features_incompat =
cpu_to_be32(from->sb_features_incompat);
to->sb_features_log_incompat =
cpu_to_be32(from->sb_features_log_incompat);
to->sb_spino_align = cpu_to_be32(from->sb_spino_align);
to->sb_lsn = cpu_to_be64(from->sb_lsn);
if (from->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID)
uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
}
/*
* If the superblock has the CRC feature bit set or the CRC field is non-null,
* check that the CRC is valid. We check the CRC field is non-null because a
* single bit error could clear the feature bit and unused parts of the
* superblock are supposed to be zero. Hence a non-null crc field indicates that
* we've potentially lost a feature bit and we should check it anyway.
*
* However, past bugs (i.e. in growfs) left non-zeroed regions beyond the
* last field in V4 secondary superblocks. So for secondary superblocks,
* we are more forgiving, and ignore CRC failures if the primary doesn't
* indicate that the fs version is V5.
*/
static void
xfs_sb_read_verify(
struct xfs_buf *bp)
{
struct xfs_sb sb;
struct xfs_mount *mp = bp->b_mount;
struct xfs_dsb *dsb = bp->b_addr;
int error;
/*
* open code the version check to avoid needing to convert the entire
* superblock from disk order just to check the version number
*/
if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) &&
(((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) ==
XFS_SB_VERSION_5) ||
dsb->sb_crc != 0)) {
if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) {
/* Only fail bad secondaries on a known V5 filesystem */
if (xfs_buf_daddr(bp) == XFS_SB_DADDR ||
xfs_has_crc(mp)) {
error = -EFSBADCRC;
goto out_error;
}
}
}
/*
* Check all the superblock fields. Don't byteswap the xquota flags
* because _verify_common checks the on-disk values.
*/
__xfs_sb_from_disk(&sb, dsb, false);
error = xfs_validate_sb_common(mp, bp, &sb);
if (error)
goto out_error;
error = xfs_validate_sb_read(mp, &sb);
out_error:
if (error == -EFSCORRUPTED || error == -EFSBADCRC)
xfs_verifier_error(bp, error, __this_address);
else if (error)
xfs_buf_ioerror(bp, error);
}
/*
* We may be probed for a filesystem match, so we may not want to emit
* messages when the superblock buffer is not actually an XFS superblock.
* If we find an XFS superblock, then run a normal, noisy mount because we are
* really going to mount it and want to know about errors.
*/
static void
xfs_sb_quiet_read_verify(
struct xfs_buf *bp)
{
struct xfs_dsb *dsb = bp->b_addr;
if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) {
/* XFS filesystem, verify noisily! */
xfs_sb_read_verify(bp);
return;
}
/* quietly fail */
xfs_buf_ioerror(bp, -EWRONGFS);
}
static void
xfs_sb_write_verify(
struct xfs_buf *bp)
{
struct xfs_sb sb;
struct xfs_mount *mp = bp->b_mount;
struct xfs_buf_log_item *bip = bp->b_log_item;
struct xfs_dsb *dsb = bp->b_addr;
int error;
/*
* Check all the superblock fields. Don't byteswap the xquota flags
* because _verify_common checks the on-disk values.
*/
__xfs_sb_from_disk(&sb, dsb, false);
error = xfs_validate_sb_common(mp, bp, &sb);
if (error)
goto out_error;
error = xfs_validate_sb_write(mp, bp, &sb);
if (error)
goto out_error;
if (!xfs_sb_is_v5(&sb))
return;
if (bip)
dsb->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn);
xfs_buf_update_cksum(bp, XFS_SB_CRC_OFF);
return;
out_error:
xfs_verifier_error(bp, error, __this_address);
}
const struct xfs_buf_ops xfs_sb_buf_ops = {
.name = "xfs_sb",
.magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
.verify_read = xfs_sb_read_verify,
.verify_write = xfs_sb_write_verify,
};
const struct xfs_buf_ops xfs_sb_quiet_buf_ops = {
.name = "xfs_sb_quiet",
.magic = { cpu_to_be32(XFS_SB_MAGIC), cpu_to_be32(XFS_SB_MAGIC) },
.verify_read = xfs_sb_quiet_read_verify,
.verify_write = xfs_sb_write_verify,
};
/*
* xfs_mount_common
*
* Mount initialization code establishing various mount
* fields from the superblock associated with the given
* mount structure.
*
* Inode geometry are calculated in xfs_ialloc_setup_geometry.
*/
void
xfs_sb_mount_common(
struct xfs_mount *mp,
struct xfs_sb *sbp)
{
mp->m_agfrotor = mp->m_agirotor = 0;
mp->m_maxagi = mp->m_sb.sb_agcount;
mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
mp->m_blockmask = sbp->sb_blocksize - 1;
mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
mp->m_blockwmask = mp->m_blockwsize - 1;
mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1);
mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0);
mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;
mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2;
mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1);
mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0);
mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2;
mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2;
mp->m_rmap_mxr[0] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 1);
mp->m_rmap_mxr[1] = xfs_rmapbt_maxrecs(sbp->sb_blocksize, 0);
mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2;
mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2;
mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, true);
mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(sbp->sb_blocksize, false);
mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2;
mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2;
mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
mp->m_ag_max_usable = xfs_alloc_ag_max_usable(mp);
}
/*
* xfs_log_sb() can be used to copy arbitrary changes to the in-core superblock
* into the superblock buffer to be logged. It does not provide the higher
* level of locking that is needed to protect the in-core superblock from
* concurrent access.
*/
void
xfs_log_sb(
struct xfs_trans *tp)
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_buf *bp = xfs_trans_getsb(tp);
/*
* Lazy sb counters don't update the in-core superblock so do that now.
* If this is at unmount, the counters will be exactly correct, but at
* any other time they will only be ballpark correct because of
* reservations that have been taken out percpu counters. If we have an
* unclean shutdown, this will be corrected by log recovery rebuilding
* the counters from the AGF block counts.
*
* Do not update sb_frextents here because it is not part of the lazy
* sb counters, despite having a percpu counter. It is always kept
* consistent with the ondisk rtbitmap by xfs_trans_apply_sb_deltas()
* and hence we don't need have to update it here.
*/
if (xfs_has_lazysbcount(mp)) {
mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount);
mp->m_sb.sb_ifree = percpu_counter_sum(&mp->m_ifree);
mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks);
}
xfs_sb_to_disk(bp->b_addr, &mp->m_sb);
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1);
}
/*
* xfs_sync_sb
*
* Sync the superblock to disk.
*
* Note that the caller is responsible for checking the frozen state of the
* filesystem. This procedure uses the non-blocking transaction allocator and
* thus will allow modifications to a frozen fs. This is required because this
* code can be called during the process of freezing where use of the high-level
* allocator would deadlock.
*/
int
xfs_sync_sb(
struct xfs_mount *mp,
bool wait)
{
struct xfs_trans *tp;
int error;
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0,
XFS_TRANS_NO_WRITECOUNT, &tp);
if (error)
return error;
xfs_log_sb(tp);
if (wait)
xfs_trans_set_sync(tp);
return xfs_trans_commit(tp);
}
/*
* Update all the secondary superblocks to match the new state of the primary.
* Because we are completely overwriting all the existing fields in the
* secondary superblock buffers, there is no need to read them in from disk.
* Just get a new buffer, stamp it and write it.
*
* The sb buffers need to be cached here so that we serialise against other
* operations that access the secondary superblocks, but we don't want to keep
* them in memory once it is written so we mark it as a one-shot buffer.
*/
int
xfs_update_secondary_sbs(
struct xfs_mount *mp)
{
struct xfs_perag *pag;
xfs_agnumber_t agno = 1;
int saved_error = 0;
int error = 0;
LIST_HEAD (buffer_list);
/* update secondary superblocks. */
for_each_perag_from(mp, agno, pag) {
struct xfs_buf *bp;
error = xfs_buf_get(mp->m_ddev_targp,
XFS_AG_DADDR(mp, pag->pag_agno, XFS_SB_DADDR),
XFS_FSS_TO_BB(mp, 1), &bp);
/*
* If we get an error reading or writing alternate superblocks,
* continue. xfs_repair chooses the "best" superblock based
* on most matches; if we break early, we'll leave more
* superblocks un-updated than updated, and xfs_repair may
* pick them over the properly-updated primary.
*/
if (error) {
xfs_warn(mp,
"error allocating secondary superblock for ag %d",
pag->pag_agno);
if (!saved_error)
saved_error = error;
continue;
}
bp->b_ops = &xfs_sb_buf_ops;
xfs_buf_oneshot(bp);
xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
xfs_sb_to_disk(bp->b_addr, &mp->m_sb);
xfs_buf_delwri_queue(bp, &buffer_list);
xfs_buf_relse(bp);
/* don't hold too many buffers at once */
if (agno % 16)
continue;
error = xfs_buf_delwri_submit(&buffer_list);
if (error) {
xfs_warn(mp,
"write error %d updating a secondary superblock near ag %d",
error, pag->pag_agno);
if (!saved_error)
saved_error = error;
continue;
}
}
error = xfs_buf_delwri_submit(&buffer_list);
if (error) {
xfs_warn(mp,
"write error %d updating a secondary superblock near ag %d",
error, agno);
}
return saved_error ? saved_error : error;
}
/*
* Same behavior as xfs_sync_sb, except that it is always synchronous and it
* also writes the superblock buffer to disk sector 0 immediately.
*/
int
xfs_sync_sb_buf(
struct xfs_mount *mp)
{
struct xfs_trans *tp;
struct xfs_buf *bp;
int error;
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp);
if (error)
return error;
bp = xfs_trans_getsb(tp);
xfs_log_sb(tp);
xfs_trans_bhold(tp, bp);
xfs_trans_set_sync(tp);
error = xfs_trans_commit(tp);
if (error)
goto out;
/*
* write out the sb buffer to get the changes to disk
*/
error = xfs_bwrite(bp);
out:
xfs_buf_relse(bp);
return error;
}
void
xfs_fs_geometry(
struct xfs_mount *mp,
struct xfs_fsop_geom *geo,
int struct_version)
{
struct xfs_sb *sbp = &mp->m_sb;
memset(geo, 0, sizeof(struct xfs_fsop_geom));
geo->blocksize = sbp->sb_blocksize;
geo->rtextsize = sbp->sb_rextsize;
geo->agblocks = sbp->sb_agblocks;
geo->agcount = sbp->sb_agcount;
geo->logblocks = sbp->sb_logblocks;
geo->sectsize = sbp->sb_sectsize;
geo->inodesize = sbp->sb_inodesize;
geo->imaxpct = sbp->sb_imax_pct;
geo->datablocks = sbp->sb_dblocks;
geo->rtblocks = sbp->sb_rblocks;
geo->rtextents = sbp->sb_rextents;
geo->logstart = sbp->sb_logstart;
BUILD_BUG_ON(sizeof(geo->uuid) != sizeof(sbp->sb_uuid));
memcpy(geo->uuid, &sbp->sb_uuid, sizeof(sbp->sb_uuid));
if (struct_version < 2)
return;
geo->sunit = sbp->sb_unit;
geo->swidth = sbp->sb_width;
if (struct_version < 3)
return;
geo->version = XFS_FSOP_GEOM_VERSION;
geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
XFS_FSOP_GEOM_FLAGS_DIRV2 |
XFS_FSOP_GEOM_FLAGS_EXTFLG;
if (xfs_has_attr(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR;
if (xfs_has_quota(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA;
if (xfs_has_align(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN;
if (xfs_has_dalign(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN;
if (xfs_has_asciici(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI;
if (xfs_has_lazysbcount(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB;
if (xfs_has_attr2(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2;
if (xfs_has_projid32(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32;
if (xfs_has_crc(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB;
if (xfs_has_ftype(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE;
if (xfs_has_finobt(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT;
if (xfs_has_sparseinodes(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES;
if (xfs_has_rmapbt(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT;
if (xfs_has_reflink(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK;
if (xfs_has_bigtime(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_BIGTIME;
if (xfs_has_inobtcounts(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_INOBTCNT;
if (xfs_has_sector(mp)) {
geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR;
geo->logsectsize = sbp->sb_logsectsize;
} else {
geo->logsectsize = BBSIZE;
}
if (xfs_has_large_extent_counts(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_NREXT64;
geo->rtsectsize = sbp->sb_blocksize;
geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp);
if (struct_version < 4)
return;
if (xfs_has_logv2(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2;
geo->logsunit = sbp->sb_logsunit;
if (struct_version < 5)
return;
geo->version = XFS_FSOP_GEOM_VERSION_V5;
}
/* Read a secondary superblock. */
int
xfs_sb_read_secondary(
struct xfs_mount *mp,
struct xfs_trans *tp,
xfs_agnumber_t agno,
struct xfs_buf **bpp)
{
struct xfs_buf *bp;
int error;
ASSERT(agno != 0 && agno != NULLAGNUMBER);
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops);
if (error)
return error;
xfs_buf_set_ref(bp, XFS_SSB_REF);
*bpp = bp;
return 0;
}
/* Get an uninitialised secondary superblock buffer. */
int
xfs_sb_get_secondary(
struct xfs_mount *mp,
struct xfs_trans *tp,
xfs_agnumber_t agno,
struct xfs_buf **bpp)
{
struct xfs_buf *bp;
int error;
ASSERT(agno != 0 && agno != NULLAGNUMBER);
error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
XFS_FSS_TO_BB(mp, 1), 0, &bp);
if (error)
return error;
bp->b_ops = &xfs_sb_buf_ops;
xfs_buf_oneshot(bp);
*bpp = bp;
return 0;
}
/*
* sunit, swidth, sectorsize(optional with 0) should be all in bytes,
* so users won't be confused by values in error messages.
*/
bool
xfs_validate_stripe_geometry(
struct xfs_mount *mp,
__s64 sunit,
__s64 swidth,
int sectorsize,
bool silent)
{
if (swidth > INT_MAX) {
if (!silent)
xfs_notice(mp,
"stripe width (%lld) is too large", swidth);
return false;
}
if (sunit > swidth) {
if (!silent)
xfs_notice(mp,
"stripe unit (%lld) is larger than the stripe width (%lld)", sunit, swidth);
return false;
}
if (sectorsize && (int)sunit % sectorsize) {
if (!silent)
xfs_notice(mp,
"stripe unit (%lld) must be a multiple of the sector size (%d)",
sunit, sectorsize);
return false;
}
if (sunit && !swidth) {
if (!silent)
xfs_notice(mp,
"invalid stripe unit (%lld) and stripe width of 0", sunit);
return false;
}
if (!sunit && swidth) {
if (!silent)
xfs_notice(mp,
"invalid stripe width (%lld) and stripe unit of 0", swidth);
return false;
}
if (sunit && (int)swidth % (int)sunit) {
if (!silent)
xfs_notice(mp,
"stripe width (%lld) must be a multiple of the stripe unit (%lld)",
swidth, sunit);
return false;
}
return true;
}
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