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linuxdebug/fs/xfs/libxfs/xfs_sb.c

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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 current support XFS v5 formats with known features and v4 superblocks with
* at least 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);
/* versions prior to v4 are not supported */
if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_4)
return false;
/* 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;
/* 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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