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[PATCH 1/6] xfs: remove bitfield based superblock updates

To: xfs@xxxxxxxxxxx
Subject: [PATCH 1/6] xfs: remove bitfield based superblock updates
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 31 Jul 2014 17:33:10 +1000
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1406791995-14723-1-git-send-email-david@xxxxxxxxxxxxx>
References: <1406791995-14723-1-git-send-email-david@xxxxxxxxxxxxx>
From: Dave Chinner <dchinner@xxxxxxxxxx>

When we log changes to the superblock, we first have to write them
to the on-disk buffer, and then log that. Right now we have a
complex bitfield based arrangement to only write the modified field
to the buffer before we log it.

This used to be necessary as a performance optimisation because we
logged the superblock buffer in every extent or inode allocation or
freeing, and so performance was extremely important. We haven't done
this for years, however, ever since the lazy superblock counters
pulled the superblock logging out of the transaction commit
fast path.

Hence we have a bunch of complexity that is not necessary that makes
writing the in-core superblock to disk much more complex than it
needs to be. We only need to log the superblock now during
management operations (e.g. during mount, unmount or quota control
operations) so it is not a performance critical path anymore.

As such, remove the complex field based logging mechanism and
replace it with a simple conversion function similar to what we use
for all other on-disk structures.

This means we always log the entirity of the superblock, but again
because we rarely modify the superblock this is not an issue for log
bandwidth or CPU time. Indeed, if we do log the superblock
frequently, delayed logging will minimise the impact of this
overhead.

Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
---
 fs/xfs/libxfs/xfs_attr_leaf.c |   2 +-
 fs/xfs/libxfs/xfs_bmap.c      |  14 +--
 fs/xfs/libxfs/xfs_sb.c        | 287 +++++++++++++++---------------------------
 fs/xfs/libxfs/xfs_sb.h        |  10 +-
 fs/xfs/xfs_fsops.c            |   6 +-
 fs/xfs/xfs_mount.c            |  18 +--
 fs/xfs/xfs_mount.h            |   2 +-
 fs/xfs/xfs_qm.c               |  26 +---
 fs/xfs/xfs_qm.h               |   2 +-
 fs/xfs/xfs_qm_syscalls.c      |  13 +-
 fs/xfs/xfs_super.c            |   2 +-
 11 files changed, 130 insertions(+), 252 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
index b1f73db..f4a47a7 100644
--- a/fs/xfs/libxfs/xfs_attr_leaf.c
+++ b/fs/xfs/libxfs/xfs_attr_leaf.c
@@ -405,7 +405,7 @@ xfs_sbversion_add_attr2(xfs_mount_t *mp, xfs_trans_t *tp)
                if (!xfs_sb_version_hasattr2(&mp->m_sb)) {
                        xfs_sb_version_addattr2(&mp->m_sb);
                        spin_unlock(&mp->m_sb_lock);
-                       xfs_mod_sb(tp, XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
+                       xfs_mod_sb(tp);
                } else
                        spin_unlock(&mp->m_sb_lock);
        }
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index de2d26d..15e8c09 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -1224,22 +1224,20 @@ xfs_bmap_add_attrfork(
                goto bmap_cancel;
        if (!xfs_sb_version_hasattr(&mp->m_sb) ||
           (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) {
-               __int64_t sbfields = 0;
+               bool mod_sb = false;
 
                spin_lock(&mp->m_sb_lock);
                if (!xfs_sb_version_hasattr(&mp->m_sb)) {
                        xfs_sb_version_addattr(&mp->m_sb);
-                       sbfields |= XFS_SB_VERSIONNUM;
+                       mod_sb = true;
                }
                if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) {
                        xfs_sb_version_addattr2(&mp->m_sb);
-                       sbfields |= (XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
+                       mod_sb = true;
                }
-               if (sbfields) {
-                       spin_unlock(&mp->m_sb_lock);
-                       xfs_mod_sb(tp, sbfields);
-               } else
-                       spin_unlock(&mp->m_sb_lock);
+               spin_unlock(&mp->m_sb_lock);
+               if (mod_sb)
+                       xfs_mod_sb(tp);
        }
 
        error = xfs_bmap_finish(&tp, &flist, &committed);
diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index 6e93b5e..d16b549 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -42,69 +42,6 @@
  * Physical superblock buffer manipulations. Shared with libxfs in userspace.
  */
 
-static const struct {
-       short offset;
-       short type;     /* 0 = integer
-                        * 1 = binary / string (no translation)
-                        */
-} xfs_sb_info[] = {
-       { offsetof(xfs_sb_t, sb_magicnum),      0 },
-       { offsetof(xfs_sb_t, sb_blocksize),     0 },
-       { offsetof(xfs_sb_t, sb_dblocks),       0 },
-       { offsetof(xfs_sb_t, sb_rblocks),       0 },
-       { offsetof(xfs_sb_t, sb_rextents),      0 },
-       { offsetof(xfs_sb_t, sb_uuid),          1 },
-       { offsetof(xfs_sb_t, sb_logstart),      0 },
-       { offsetof(xfs_sb_t, sb_rootino),       0 },
-       { offsetof(xfs_sb_t, sb_rbmino),        0 },
-       { offsetof(xfs_sb_t, sb_rsumino),       0 },
-       { offsetof(xfs_sb_t, sb_rextsize),      0 },
-       { offsetof(xfs_sb_t, sb_agblocks),      0 },
-       { offsetof(xfs_sb_t, sb_agcount),       0 },
-       { offsetof(xfs_sb_t, sb_rbmblocks),     0 },
-       { offsetof(xfs_sb_t, sb_logblocks),     0 },
-       { offsetof(xfs_sb_t, sb_versionnum),    0 },
-       { offsetof(xfs_sb_t, sb_sectsize),      0 },
-       { offsetof(xfs_sb_t, sb_inodesize),     0 },
-       { offsetof(xfs_sb_t, sb_inopblock),     0 },
-       { offsetof(xfs_sb_t, sb_fname[0]),      1 },
-       { offsetof(xfs_sb_t, sb_blocklog),      0 },
-       { offsetof(xfs_sb_t, sb_sectlog),       0 },
-       { offsetof(xfs_sb_t, sb_inodelog),      0 },
-       { offsetof(xfs_sb_t, sb_inopblog),      0 },
-       { offsetof(xfs_sb_t, sb_agblklog),      0 },
-       { offsetof(xfs_sb_t, sb_rextslog),      0 },
-       { offsetof(xfs_sb_t, sb_inprogress),    0 },
-       { offsetof(xfs_sb_t, sb_imax_pct),      0 },
-       { offsetof(xfs_sb_t, sb_icount),        0 },
-       { offsetof(xfs_sb_t, sb_ifree),         0 },
-       { offsetof(xfs_sb_t, sb_fdblocks),      0 },
-       { offsetof(xfs_sb_t, sb_frextents),     0 },
-       { offsetof(xfs_sb_t, sb_uquotino),      0 },
-       { offsetof(xfs_sb_t, sb_gquotino),      0 },
-       { offsetof(xfs_sb_t, sb_qflags),        0 },
-       { offsetof(xfs_sb_t, sb_flags),         0 },
-       { offsetof(xfs_sb_t, sb_shared_vn),     0 },
-       { offsetof(xfs_sb_t, sb_inoalignmt),    0 },
-       { offsetof(xfs_sb_t, sb_unit),          0 },
-       { offsetof(xfs_sb_t, sb_width),         0 },
-       { offsetof(xfs_sb_t, sb_dirblklog),     0 },
-       { offsetof(xfs_sb_t, sb_logsectlog),    0 },
-       { offsetof(xfs_sb_t, sb_logsectsize),   0 },
-       { offsetof(xfs_sb_t, sb_logsunit),      0 },
-       { offsetof(xfs_sb_t, sb_features2),     0 },
-       { offsetof(xfs_sb_t, sb_bad_features2), 0 },
-       { offsetof(xfs_sb_t, sb_features_compat),       0 },
-       { offsetof(xfs_sb_t, sb_features_ro_compat),    0 },
-       { offsetof(xfs_sb_t, sb_features_incompat),     0 },
-       { offsetof(xfs_sb_t, sb_features_log_incompat), 0 },
-       { offsetof(xfs_sb_t, sb_crc),           0 },
-       { offsetof(xfs_sb_t, sb_pad),           0 },
-       { offsetof(xfs_sb_t, sb_pquotino),      0 },
-       { offsetof(xfs_sb_t, sb_lsn),           0 },
-       { sizeof(xfs_sb_t),                     0 }
-};
-
 /*
  * Reference counting access wrappers to the perag structures.
  * Because we never free per-ag structures, the only thing we
@@ -447,125 +384,119 @@ xfs_sb_from_disk(
        to->sb_lsn = be64_to_cpu(from->sb_lsn);
 }
 
-static inline void
+static void
 xfs_sb_quota_to_disk(
-       xfs_dsb_t       *to,
-       xfs_sb_t        *from,
-       __int64_t       *fields)
+       struct xfs_dsb  *to,
+       struct xfs_sb   *from)
 {
        __uint16_t      qflags = from->sb_qflags;
 
+       to->sb_uquotino = cpu_to_be64(from->sb_uquotino);
+       if (xfs_sb_version_has_pquotino(from)) {
+               to->sb_qflags = be16_to_cpu(from->sb_qflags);
+               to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
+               to->sb_pquotino = cpu_to_be64(from->sb_pquotino);
+               return;
+       }
+
        /*
-        * We need to do these manipilations only if we are working
-        * with an older version of on-disk superblock.
+        * 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.
         */
-       if (xfs_sb_version_has_pquotino(from))
-               return;
+       qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
+                       XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
 
-       if (*fields & XFS_SB_QFLAGS) {
-               /*
-                * 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);
-               *fields &= ~XFS_SB_QFLAGS;
-       }
+       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,
-        * make sure we write NULLFSINO to the sb_gquotino field as a quota
-        * inode value of "0" is invalid when the XFS_SB_VERSION_QUOTA feature
-        * bit is set.
+        * 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.
         *
-        * Note that we don't need to handle the sb_uquotino or sb_pquotino here
-        * as they do not require any translation. Hence the main sb field loop
-        * will write them appropriately from the in-core superblock.
+        * In all cases, the separate pquotino must remain 0 because it
+        * it beyond the "end" of the valid non-pquotino superblock.
         */
-       if ((*fields & XFS_SB_GQUOTINO) &&
-                               (from->sb_qflags & XFS_GQUOTA_ACCT))
+       if (from->sb_qflags & XFS_GQUOTA_ACCT)
                to->sb_gquotino = cpu_to_be64(from->sb_gquotino);
-       else if ((*fields & XFS_SB_PQUOTINO) &&
-                               (from->sb_qflags & XFS_PQUOTA_ACCT))
+       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);
-       }
+       else
+               to->sb_gquotino = cpu_to_be64(NULLFSINO);
 
-       *fields &= ~(XFS_SB_PQUOTINO | XFS_SB_GQUOTINO);
+       to->sb_pquotino = 0;
 }
 
-/*
- * Copy in core superblock to ondisk one.
- *
- * The fields argument is mask of superblock fields to copy.
- */
 void
 xfs_sb_to_disk(
-       xfs_dsb_t       *to,
-       xfs_sb_t        *from,
-       __int64_t       fields)
+       struct xfs_dsb  *to,
+       struct xfs_sb   *from)
 {
-       xfs_caddr_t     to_ptr = (xfs_caddr_t)to;
-       xfs_caddr_t     from_ptr = (xfs_caddr_t)from;
-       xfs_sb_field_t  f;
-       int             first;
-       int             size;
-
-       ASSERT(fields);
-       if (!fields)
-               return;
+       xfs_sb_quota_to_disk(to, from);
 
-       xfs_sb_quota_to_disk(to, from, &fields);
-       while (fields) {
-               f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
-               first = xfs_sb_info[f].offset;
-               size = xfs_sb_info[f + 1].offset - first;
-
-               ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
-
-               if (size == 1 || xfs_sb_info[f].type == 1) {
-                       memcpy(to_ptr + first, from_ptr + first, size);
-               } else {
-                       switch (size) {
-                       case 2:
-                               *(__be16 *)(to_ptr + first) =
-                                     cpu_to_be16(*(__u16 *)(from_ptr + first));
-                               break;
-                       case 4:
-                               *(__be32 *)(to_ptr + first) =
-                                     cpu_to_be32(*(__u32 *)(from_ptr + first));
-                               break;
-                       case 8:
-                               *(__be64 *)(to_ptr + first) =
-                                     cpu_to_be64(*(__u64 *)(from_ptr + first));
-                               break;
-                       default:
-                               ASSERT(0);
-                       }
-               }
+       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);
 
-               fields &= ~(1LL << f);
+
+       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);
+       to->sb_features2 = cpu_to_be32(from->sb_features2);
+       to->sb_bad_features2 = cpu_to_be32(from->sb_bad_features2);
+
+       if (xfs_sb_version_hascrc(from)) {
+               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_pad = 0;
+               to->sb_lsn = cpu_to_be64(from->sb_lsn);
        }
 }
 
@@ -802,35 +733,13 @@ xfs_initialize_perag_data(
  * access.
  */
 void
-xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
+xfs_mod_sb(
+       struct xfs_trans        *tp)
 {
-       xfs_buf_t       *bp;
-       int             first;
-       int             last;
-       xfs_mount_t     *mp;
-       xfs_sb_field_t  f;
-
-       ASSERT(fields);
-       if (!fields)
-               return;
-       mp = tp->t_mountp;
-       bp = xfs_trans_getsb(tp, mp, 0);
-       first = sizeof(xfs_sb_t);
-       last = 0;
-
-       /* translate/copy */
-
-       xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields);
-
-       /* find modified range */
-       f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
-       ASSERT((1LL << f) & XFS_SB_MOD_BITS);
-       last = xfs_sb_info[f + 1].offset - 1;
-
-       f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
-       ASSERT((1LL << f) & XFS_SB_MOD_BITS);
-       first = xfs_sb_info[f].offset;
+       struct xfs_mount        *mp = tp->t_mountp;
+       struct xfs_buf          *bp = xfs_trans_getsb(tp, mp, 0);
 
+       xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
        xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
-       xfs_trans_log_buf(tp, bp, first, last);
+       xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb));
 }
diff --git a/fs/xfs/libxfs/xfs_sb.h b/fs/xfs/libxfs/xfs_sb.h
index 2e73970..c28b3c1 100644
--- a/fs/xfs/libxfs/xfs_sb.h
+++ b/fs/xfs/libxfs/xfs_sb.h
@@ -611,11 +611,11 @@ extern struct xfs_perag *xfs_perag_get_tag(struct 
xfs_mount *, xfs_agnumber_t,
 extern void    xfs_perag_put(struct xfs_perag *pag);
 extern int     xfs_initialize_perag_data(struct xfs_mount *, xfs_agnumber_t);
 
-extern void    xfs_sb_calc_crc(struct xfs_buf  *);
-extern void    xfs_mod_sb(struct xfs_trans *, __int64_t);
-extern void    xfs_sb_mount_common(struct xfs_mount *, struct xfs_sb *);
-extern void    xfs_sb_from_disk(struct xfs_sb *, struct xfs_dsb *);
-extern void    xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
+extern void    xfs_sb_calc_crc(struct xfs_buf *bp);
+extern void    xfs_mod_sb(struct xfs_trans *tp);
+extern void    xfs_sb_mount_common(struct xfs_mount *mp, struct xfs_sb *sbp);
+extern void    xfs_sb_from_disk(struct xfs_sb *to, struct xfs_dsb *from);
+extern void    xfs_sb_to_disk(struct xfs_dsb *to, struct xfs_sb *from);
 extern void    xfs_sb_quota_from_disk(struct xfs_sb *sbp);
 
 #endif /* __XFS_SB_H__ */
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index f91de1e..2c44e0b 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -548,7 +548,7 @@ xfs_growfs_data_private(
                        saved_error = error;
                        continue;
                }
-               xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
+               xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
 
                error = xfs_bwrite(bp);
                xfs_buf_relse(bp);
@@ -787,9 +787,7 @@ xfs_fs_log_dummy(
                xfs_trans_cancel(tp, 0);
                return error;
        }
-
-       /* log the UUID because it is an unchanging field */
-       xfs_mod_sb(tp, XFS_SB_UUID);
+       xfs_mod_sb(tp);
        xfs_trans_set_sync(tp);
        return xfs_trans_commit(tp, 0);
 }
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 6dbad45..592e169 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -621,7 +621,7 @@ xfs_mount_reset_sbqflags(
                return error;
        }
 
-       xfs_mod_sb(tp, XFS_SB_QFLAGS);
+       xfs_mod_sb(tp);
        return xfs_trans_commit(tp, 0);
 }
 
@@ -905,7 +905,7 @@ xfs_mountfs(
         * perform the update e.g. for the root filesystem.
         */
        if (mp->m_update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) {
-               error = xfs_mount_log_sb(mp, mp->m_update_flags);
+               error = xfs_mount_log_sb(mp);
                if (error) {
                        xfs_warn(mp, "failed to write sb changes");
                        goto out_rtunmount;
@@ -1122,7 +1122,7 @@ xfs_log_sbcount(xfs_mount_t *mp)
                return error;
        }
 
-       xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS);
+       xfs_mod_sb(tp);
        xfs_trans_set_sync(tp);
        error = xfs_trans_commit(tp, 0);
        return error;
@@ -1425,25 +1425,19 @@ xfs_freesb(
  */
 int
 xfs_mount_log_sb(
-       xfs_mount_t     *mp,
-       __int64_t       fields)
+       xfs_mount_t     *mp)
 {
        xfs_trans_t     *tp;
        int             error;
 
-       ASSERT(fields & (XFS_SB_UNIT | XFS_SB_WIDTH | XFS_SB_UUID |
-                        XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2 |
-                        XFS_SB_VERSIONNUM));
-
        tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
        error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
        if (error) {
                xfs_trans_cancel(tp, 0);
                return error;
        }
-       xfs_mod_sb(tp, fields);
-       error = xfs_trans_commit(tp, 0);
-       return error;
+       xfs_mod_sb(tp);
+       return xfs_trans_commit(tp, 0);
 }
 
 /*
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index b0447c8..1ae9f56 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -380,7 +380,7 @@ extern void xfs_unmountfs(xfs_mount_t *);
 extern int     xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
 extern int     xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
                        uint, int);
-extern int     xfs_mount_log_sb(xfs_mount_t *, __int64_t);
+extern int     xfs_mount_log_sb(xfs_mount_t *);
 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
 extern int     xfs_readsb(xfs_mount_t *, int);
 extern void    xfs_freesb(xfs_mount_t *);
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index 1023210..170f951 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -715,7 +715,6 @@ STATIC int
 xfs_qm_qino_alloc(
        xfs_mount_t     *mp,
        xfs_inode_t     **ip,
-       __int64_t       sbfields,
        uint            flags)
 {
        xfs_trans_t     *tp;
@@ -778,11 +777,6 @@ xfs_qm_qino_alloc(
        spin_lock(&mp->m_sb_lock);
        if (flags & XFS_QMOPT_SBVERSION) {
                ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
-               ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
-                       XFS_SB_GQUOTINO | XFS_SB_PQUOTINO | XFS_SB_QFLAGS)) ==
-                               (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
-                                XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
-                                XFS_SB_QFLAGS));
 
                xfs_sb_version_addquota(&mp->m_sb);
                mp->m_sb.sb_uquotino = NULLFSINO;
@@ -799,7 +793,7 @@ xfs_qm_qino_alloc(
        else
                mp->m_sb.sb_pquotino = (*ip)->i_ino;
        spin_unlock(&mp->m_sb_lock);
-       xfs_mod_sb(tp, sbfields);
+       xfs_mod_sb(tp);
 
        if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
                xfs_alert(mp, "%s failed (error %d)!", __func__, error);
@@ -1452,7 +1446,7 @@ xfs_qm_mount_quotas(
        spin_unlock(&mp->m_sb_lock);
 
        if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
-               if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
+               if (xfs_qm_write_sb_changes(mp)) {
                        /*
                         * We could only have been turning quotas off.
                         * We aren't in very good shape actually because
@@ -1483,7 +1477,6 @@ xfs_qm_init_quotainos(
        struct xfs_inode        *gip = NULL;
        struct xfs_inode        *pip = NULL;
        int                     error;
-       __int64_t               sbflags = 0;
        uint                    flags = 0;
 
        ASSERT(mp->m_quotainfo);
@@ -1518,9 +1511,6 @@ xfs_qm_init_quotainos(
                }
        } else {
                flags |= XFS_QMOPT_SBVERSION;
-               sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
-                           XFS_SB_GQUOTINO | XFS_SB_PQUOTINO |
-                           XFS_SB_QFLAGS);
        }
 
        /*
@@ -1531,7 +1521,6 @@ xfs_qm_init_quotainos(
         */
        if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
                error = xfs_qm_qino_alloc(mp, &uip,
-                                             sbflags | XFS_SB_UQUOTINO,
                                              flags | XFS_QMOPT_UQUOTA);
                if (error)
                        goto error_rele;
@@ -1540,7 +1529,6 @@ xfs_qm_init_quotainos(
        }
        if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
                error = xfs_qm_qino_alloc(mp, &gip,
-                                         sbflags | XFS_SB_GQUOTINO,
                                          flags | XFS_QMOPT_GQUOTA);
                if (error)
                        goto error_rele;
@@ -1549,7 +1537,6 @@ xfs_qm_init_quotainos(
        }
        if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
                error = xfs_qm_qino_alloc(mp, &pip,
-                                         sbflags | XFS_SB_PQUOTINO,
                                          flags | XFS_QMOPT_PQUOTA);
                if (error)
                        goto error_rele;
@@ -1594,8 +1581,7 @@ xfs_qm_dqfree_one(
  */
 int
 xfs_qm_write_sb_changes(
-       xfs_mount_t     *mp,
-       __int64_t       flags)
+       struct xfs_mount *mp)
 {
        xfs_trans_t     *tp;
        int             error;
@@ -1607,10 +1593,8 @@ xfs_qm_write_sb_changes(
                return error;
        }
 
-       xfs_mod_sb(tp, flags);
-       error = xfs_trans_commit(tp, 0);
-
-       return error;
+       xfs_mod_sb(tp);
+       return xfs_trans_commit(tp, 0);
 }
 
 
diff --git a/fs/xfs/xfs_qm.h b/fs/xfs/xfs_qm.h
index 3a07a93..bddd23f 100644
--- a/fs/xfs/xfs_qm.h
+++ b/fs/xfs/xfs_qm.h
@@ -157,7 +157,7 @@ struct xfs_dquot_acct {
 #define XFS_QM_RTBWARNLIMIT    5
 
 extern void            xfs_qm_destroy_quotainfo(struct xfs_mount *);
-extern int             xfs_qm_write_sb_changes(struct xfs_mount *, __int64_t);
+extern int             xfs_qm_write_sb_changes(struct xfs_mount *);
 
 /* dquot stuff */
 extern void            xfs_qm_dqpurge_all(struct xfs_mount *, uint);
diff --git a/fs/xfs/xfs_qm_syscalls.c b/fs/xfs/xfs_qm_syscalls.c
index 80f2d77..45f28f1 100644
--- a/fs/xfs/xfs_qm_syscalls.c
+++ b/fs/xfs/xfs_qm_syscalls.c
@@ -93,8 +93,7 @@ xfs_qm_scall_quotaoff(
                mutex_unlock(&q->qi_quotaofflock);
 
                /* XXX what to do if error ? Revert back to old vals incore ? */
-               error = xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS);
-               return error;
+               return xfs_qm_write_sb_changes(mp);
        }
 
        dqtype = 0;
@@ -315,7 +314,6 @@ xfs_qm_scall_quotaon(
 {
        int             error;
        uint            qf;
-       __int64_t       sbflags;
 
        flags &= (XFS_ALL_QUOTA_ACCT | XFS_ALL_QUOTA_ENFD);
        /*
@@ -323,8 +321,6 @@ xfs_qm_scall_quotaon(
         */
        flags &= ~(XFS_ALL_QUOTA_ACCT);
 
-       sbflags = 0;
-
        if (flags == 0) {
                xfs_debug(mp, "%s: zero flags, m_qflags=%x",
                        __func__, mp->m_qflags);
@@ -371,11 +367,10 @@ xfs_qm_scall_quotaon(
        /*
         * There's nothing to change if it's the same.
         */
-       if ((qf & flags) == flags && sbflags == 0)
+       if ((qf & flags) == flags)
                return -EEXIST;
-       sbflags |= XFS_SB_QFLAGS;
 
-       if ((error = xfs_qm_write_sb_changes(mp, sbflags)))
+       if ((error = xfs_qm_write_sb_changes(mp)))
                return error;
        /*
         * If we aren't trying to switch on quota enforcement, we are done.
@@ -800,7 +795,7 @@ xfs_qm_log_quotaoff(
        mp->m_sb.sb_qflags = (mp->m_qflags & ~(flags)) & XFS_MOUNT_QUOTA_ALL;
        spin_unlock(&mp->m_sb_lock);
 
-       xfs_mod_sb(tp, XFS_SB_QFLAGS);
+       xfs_mod_sb(tp);
 
        /*
         * We have to make sure that the transaction is secure on disk before we
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index b194652..8aa9eb4 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1250,7 +1250,7 @@ xfs_fs_remount(
                 * might have some superblock changes to update.
                 */
                if (mp->m_update_flags) {
-                       error = xfs_mount_log_sb(mp, mp->m_update_flags);
+                       error = xfs_mount_log_sb(mp);
                        if (error) {
                                xfs_warn(mp, "failed to write sb changes");
                                return error;
-- 
2.0.0

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