6 files changed, 191 insertions, 94 deletions

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index 432e82347ed6..3d27909770ea 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -136,7 +136,6 @@ xfs_growfs_data_private(
         xfs_rfsblock_t          nfree;
         xfs_agnumber_t          oagcount;
         int                     pct;
-        xfs_sb_t                *sbp;
         xfs_trans_t             *tp;
 
         nb = in->newblocks;
@@ -377,8 +376,7 @@ xfs_growfs_data_private(
                                 error, agno);
                         break;
                 }
-                sbp = XFS_BUF_TO_SBP(bp);
-                xfs_xlatesb(sbp, &mp->m_sb, -1, XFS_SB_ALL_BITS);
+                xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
                 /*
                  * If we get an error writing out the alternate superblocks,
                  * just issue a warning and continue.  The real work is
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 758543443b66..eb341461feb9 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -3846,7 +3846,7 @@ xlog_do_recover(
 
         /* Convert superblock from on-disk format */
         sbp = &log->l_mp->m_sb;
-        xfs_xlatesb(XFS_BUF_TO_SBP(bp), sbp, 1, XFS_SB_ALL_BITS);
+        xfs_sb_from_disk(sbp, XFS_BUF_TO_SBP(bp));
         ASSERT(sbp->sb_magicnum == XFS_SB_MAGIC);
         ASSERT(XFS_SB_GOOD_VERSION(sbp));
         xfs_buf_relse(bp);
@@ -4024,7 +4024,7 @@ xlog_recover_check_summary(
         sbbp = xfs_getsb(mp, 0);
 #ifdef XFS_LOUD_RECOVERY
         sbp = &mp->m_sb;
-        xfs_xlatesb(XFS_BUF_TO_SBP(sbbp), sbp, 1, XFS_SB_ALL_BITS);
+        xfs_sb_from_disk(sbp, XFS_BUF_TO_SBP(sbbp));
         cmn_err(CE_NOTE,
                 "xlog_recover_check_summary: sb_icount %Lu itotal %Lu",
                 sbp->sb_icount, itotal);
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index eef27f21f9ab..f4daf1ec9931 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -407,37 +407,79 @@ xfs_initialize_perag(
         return index;
 }
 
+void
+xfs_sb_from_disk(
+        xfs_sb_t        *to,
+        xfs_dsb_t       *from)
+{
+        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);
+}
+
 /*
- * xfs_xlatesb
+ * Copy in core superblock to ondisk one.
  *
- *     data       - on disk version of sb
- *     sb         - a superblock
- *     dir        - conversion direction: <0 - convert sb to buf
- *                                        >0 - convert buf to sb
- *     fields     - which fields to copy (bitmask)
+ * The fields argument is mask of superblock fields to copy.
  */
 void
-xfs_xlatesb(
-        void            *data,
-        xfs_sb_t        *sb,
-        int             dir,
+xfs_sb_to_disk(
+        xfs_dsb_t       *to,
+        xfs_sb_t        *from,
         __int64_t       fields)
 {
-        xfs_caddr_t     buf_ptr;
-        xfs_caddr_t     mem_ptr;
+        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(dir);
         ASSERT(fields);
-
         if (!fields)
                 return;
 
-        buf_ptr = (xfs_caddr_t)data;
-        mem_ptr = (xfs_caddr_t)sb;
-
         while (fields) {
                 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
                 first = xfs_sb_info[f].offset;
@@ -446,26 +488,20 @@ xfs_xlatesb(
                 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
 
                 if (size == 1 || xfs_sb_info[f].type == 1) {
-                        if (dir > 0) {
-                                memcpy(mem_ptr + first, buf_ptr + first, size);
-                        } else {
-                                memcpy(buf_ptr + first, mem_ptr + first, size);
-                        }
+                        memcpy(to_ptr + first, from_ptr + first, size);
                 } else {
                         switch (size) {
                         case 2:
-                                INT_XLATE(*(__uint16_t*)(buf_ptr+first),
-                                          *(__uint16_t*)(mem_ptr+first),
-                                          dir, ARCH_CONVERT);
+                                *(__be16 *)(to_ptr + first) =
+                                        cpu_to_be16(*(__u16 *)(from_ptr + first));
                                 break;
                         case 4:
-                                INT_XLATE(*(__uint32_t*)(buf_ptr+first),
-                                          *(__uint32_t*)(mem_ptr+first),
-                                          dir, ARCH_CONVERT);
+                                *(__be32 *)(to_ptr + first) =
+                                        cpu_to_be32(*(__u32 *)(from_ptr + first));
                                 break;
                         case 8:
-                                INT_XLATE(*(__uint64_t*)(buf_ptr+first),
-                                          *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT);
+                                *(__be64 *)(to_ptr + first) =
+                                        cpu_to_be64(*(__u64 *)(from_ptr + first));
                                 break;
                         default:
                                 ASSERT(0);
@@ -487,7 +523,6 @@ xfs_readsb(xfs_mount_t *mp, int flags)
         unsigned int    sector_size;
         unsigned int    extra_flags;
         xfs_buf_t       *bp;
-        xfs_sb_t        *sbp;
         int             error;
 
         ASSERT(mp->m_sb_bp == NULL);
@@ -515,8 +550,7 @@ xfs_readsb(xfs_mount_t *mp, int flags)
          * Initialize the mount structure from the superblock.
          * But first do some basic consistency checking.
          */
-        sbp = XFS_BUF_TO_SBP(bp);
-        xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS);
+        xfs_sb_from_disk(&mp->m_sb, XFS_BUF_TO_SBP(bp));
 
         error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags);
         if (error) {
@@ -1335,11 +1369,28 @@ xfs_log_sbcount(
         return 0;
 }
 
+STATIC void
+xfs_mark_shared_ro(
+        xfs_mount_t     *mp,
+        xfs_buf_t       *bp)
+{
+        xfs_dsb_t       *sb = XFS_BUF_TO_SBP(bp);
+        __uint16_t      version;
+
+        if (!(sb->sb_flags & XFS_SBF_READONLY))
+                sb->sb_flags |= XFS_SBF_READONLY;
+
+        version = be16_to_cpu(sb->sb_versionnum);
+        if ((version & XFS_SB_VERSION_NUMBITS) != XFS_SB_VERSION_4 ||
+            !(version & XFS_SB_VERSION_SHAREDBIT))
+                version |= XFS_SB_VERSION_SHAREDBIT;
+        sb->sb_versionnum = cpu_to_be16(version);
+}
+
 int
 xfs_unmountfs_writesb(xfs_mount_t *mp)
 {
         xfs_buf_t       *sbp;
-        xfs_sb_t        *sb;
         int             error = 0;
 
         /*
@@ -1350,19 +1401,12 @@ xfs_unmountfs_writesb(xfs_mount_t *mp)
                 XFS_FORCED_SHUTDOWN(mp))) {
 
                 sbp = xfs_getsb(mp, 0);
-                sb = XFS_BUF_TO_SBP(sbp);
 
                 /*
                  * mark shared-readonly if desired
                  */
-                if (mp->m_mk_sharedro) {
-                        if (!(sb->sb_flags & XFS_SBF_READONLY))
-                                sb->sb_flags |= XFS_SBF_READONLY;
-                        if (!XFS_SB_VERSION_HASSHARED(sb))
-                                XFS_SB_VERSION_ADDSHARED(sb);
-                        xfs_fs_cmn_err(CE_NOTE, mp,
-                                "Unmounting, marking shared read-only");
-                }
+                if (mp->m_mk_sharedro)
+                        xfs_mark_shared_ro(mp, sbp);
 
                 XFS_BUF_UNDONE(sbp);
                 XFS_BUF_UNREAD(sbp);
@@ -1397,7 +1441,6 @@ xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
         int             first;
         int             last;
         xfs_mount_t     *mp;
-        xfs_sb_t        *sbp;
         xfs_sb_field_t  f;
 
         ASSERT(fields);
@@ -1405,13 +1448,12 @@ xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
                 return;
         mp = tp->t_mountp;
         bp = xfs_trans_getsb(tp, mp, 0);
-        sbp = XFS_BUF_TO_SBP(bp);
         first = sizeof(xfs_sb_t);
         last = 0;
 
         /* translate/copy */
 
-        xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields);
+        xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields);
 
         /* find modified range */
 
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 1a5d1d360d80..9ceff40326d0 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -630,7 +630,8 @@ extern int	xfs_syncsub(xfs_mount_t *, int, int *);
 extern int      xfs_sync_inodes(xfs_mount_t *, int, int *);
 extern xfs_agnumber_t   xfs_initialize_perag(struct bhv_vfs *, xfs_mount_t *,
                                                 xfs_agnumber_t);
-extern void     xfs_xlatesb(void *, struct xfs_sb *, int, __int64_t);
+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 int      xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
 
 extern struct xfs_dmops xfs_dmcore_stub;
diff --git a/fs/xfs/xfs_sb.h b/fs/xfs/xfs_sb.h
index ef42537a607a..94660b1a6ccc 100644
--- a/fs/xfs/xfs_sb.h
+++ b/fs/xfs/xfs_sb.h
@@ -87,8 +87,10 @@ struct xfs_mount;
         (XFS_SB_VERSION2_OKREALFBITS |  \
          XFS_SB_VERSION2_OKSASHFBITS )
 
-typedef struct xfs_sb
-{
+/*
+ * Superblock - in core version.  Must match the ondisk version below.
+ */
+typedef struct xfs_sb {
         __uint32_t      sb_magicnum;    /* magic number == XFS_SB_MAGIC */
         __uint32_t      sb_blocksize;   /* logical block size, bytes */
         xfs_drfsbno_t   sb_dblocks;     /* number of data blocks */
@@ -146,6 +148,66 @@ typedef struct xfs_sb
 } xfs_sb_t;
 
 /*
+ * Superblock - on disk version.  Must match the in core version below.
+ */
+typedef struct xfs_dsb {
+        __be32          sb_magicnum;    /* magic number == XFS_SB_MAGIC */
+        __be32          sb_blocksize;   /* logical block size, bytes */
+        __be64          sb_dblocks;     /* number of data blocks */
+        __be64          sb_rblocks;     /* number of realtime blocks */
+        __be64          sb_rextents;    /* number of realtime extents */
+        uuid_t          sb_uuid;        /* file system unique id */
+        __be64          sb_logstart;    /* starting block of log if internal */
+        __be64          sb_rootino;     /* root inode number */
+        __be64          sb_rbmino;      /* bitmap inode for realtime extents */
+        __be64          sb_rsumino;     /* summary inode for rt bitmap */
+        __be32          sb_rextsize;    /* realtime extent size, blocks */
+        __be32          sb_agblocks;    /* size of an allocation group */
+        __be32          sb_agcount;     /* number of allocation groups */
+        __be32          sb_rbmblocks;   /* number of rt bitmap blocks */
+        __be32          sb_logblocks;   /* number of log blocks */
+        __be16          sb_versionnum;  /* header version == XFS_SB_VERSION */
+        __be16          sb_sectsize;    /* volume sector size, bytes */
+        __be16          sb_inodesize;   /* inode size, bytes */
+        __be16          sb_inopblock;   /* inodes per block */
+        char            sb_fname[12];   /* file system name */
+        __u8            sb_blocklog;    /* log2 of sb_blocksize */
+        __u8            sb_sectlog;     /* log2 of sb_sectsize */
+        __u8            sb_inodelog;    /* log2 of sb_inodesize */
+        __u8            sb_inopblog;    /* log2 of sb_inopblock */
+        __u8            sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
+        __u8            sb_rextslog;    /* log2 of sb_rextents */
+        __u8            sb_inprogress;  /* mkfs is in progress, don't mount */
+        __u8            sb_imax_pct;    /* max % of fs for inode space */
+                                        /* statistics */
+        /*
+         * These fields must remain contiguous.  If you really
+         * want to change their layout, make sure you fix the
+         * code in xfs_trans_apply_sb_deltas().
+         */
+        __be64          sb_icount;      /* allocated inodes */
+        __be64          sb_ifree;       /* free inodes */
+        __be64          sb_fdblocks;    /* free data blocks */
+        __be64          sb_frextents;   /* free realtime extents */
+        /*
+         * End contiguous fields.
+         */
+        __be64          sb_uquotino;    /* user quota inode */
+        __be64          sb_gquotino;    /* group quota inode */
+        __be16          sb_qflags;      /* quota flags */
+        __u8            sb_flags;       /* misc. flags */
+        __u8            sb_shared_vn;   /* shared version number */
+        __be32          sb_inoalignmt;  /* inode chunk alignment, fsblocks */
+        __be32          sb_unit;        /* stripe or raid unit */
+        __be32          sb_width;       /* stripe or raid width */
+        __u8            sb_dirblklog;   /* log2 of dir block size (fsbs) */
+        __u8            sb_logsectlog;  /* log2 of the log sector size */
+        __be16          sb_logsectsize; /* sector size for the log, bytes */
+        __be32          sb_logsunit;    /* stripe unit size for the log */
+        __be32          sb_features2;   /* additional feature bits */
+} xfs_dsb_t;
+
+/*
  * Sequence number values for the fields.
  */
 typedef enum {
@@ -446,7 +508,7 @@ static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
 
 #define XFS_SB_DADDR            ((xfs_daddr_t)0) /* daddr in filesystem/ag */
 #define XFS_SB_BLOCK(mp)        XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
-#define XFS_BUF_TO_SBP(bp)      ((xfs_sb_t *)XFS_BUF_PTR(bp))
+#define XFS_BUF_TO_SBP(bp)      ((xfs_dsb_t *)XFS_BUF_PTR(bp))
 
 #define XFS_HDR_BLOCK(mp,d)     ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
 #define XFS_DADDR_TO_FSB(mp,d)  XFS_AGB_TO_FSB(mp, \
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 356d6627f581..668996aae36d 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -548,7 +548,7 @@ STATIC void
 xfs_trans_apply_sb_deltas(
         xfs_trans_t     *tp)
 {
-        xfs_sb_t        *sbp;
+        xfs_dsb_t       *sbp;
         xfs_buf_t       *bp;
         int             whole = 0;
 
@@ -566,57 +566,51 @@ xfs_trans_apply_sb_deltas(
          * Only update the superblock counters if we are logging them
          */
         if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
-                if (tp->t_icount_delta != 0) {
-                        INT_MOD(sbp->sb_icount, ARCH_CONVERT, tp->t_icount_delta);
-                }
-                if (tp->t_ifree_delta != 0) {
-                        INT_MOD(sbp->sb_ifree, ARCH_CONVERT, tp->t_ifree_delta);
-                }
-
-                if (tp->t_fdblocks_delta != 0) {
-                        INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_fdblocks_delta);
-                }
-                if (tp->t_res_fdblocks_delta != 0) {
-                        INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_res_fdblocks_delta);
-                }
+                if (tp->t_icount_delta)
+                        be64_add(&sbp->sb_icount, tp->t_icount_delta);
+                if (tp->t_ifree_delta)
+                        be64_add(&sbp->sb_ifree, tp->t_ifree_delta);
+                if (tp->t_fdblocks_delta)
+                        be64_add(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
+                if (tp->t_res_fdblocks_delta)
+                        be64_add(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
         }
 
-        if (tp->t_frextents_delta != 0) {
-                INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_frextents_delta);
-        }
-        if (tp->t_res_frextents_delta != 0) {
-                INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_res_frextents_delta);
-        }
-        if (tp->t_dblocks_delta != 0) {
-                INT_MOD(sbp->sb_dblocks, ARCH_CONVERT, tp->t_dblocks_delta);
+        if (tp->t_frextents_delta)
+                be64_add(&sbp->sb_frextents, tp->t_frextents_delta);
+        if (tp->t_res_frextents_delta)
+                be64_add(&sbp->sb_frextents, tp->t_res_frextents_delta);
+
+        if (tp->t_dblocks_delta) {
+                be64_add(&sbp->sb_dblocks, tp->t_dblocks_delta);
                 whole = 1;
         }
-        if (tp->t_agcount_delta != 0) {
-                INT_MOD(sbp->sb_agcount, ARCH_CONVERT, tp->t_agcount_delta);
+        if (tp->t_agcount_delta) {
+                be32_add(&sbp->sb_agcount, tp->t_agcount_delta);
                 whole = 1;
         }
-        if (tp->t_imaxpct_delta != 0) {
-                INT_MOD(sbp->sb_imax_pct, ARCH_CONVERT, tp->t_imaxpct_delta);
+        if (tp->t_imaxpct_delta) {
+                sbp->sb_imax_pct += tp->t_imaxpct_delta;
                 whole = 1;
         }
-        if (tp->t_rextsize_delta != 0) {
-                INT_MOD(sbp->sb_rextsize, ARCH_CONVERT, tp->t_rextsize_delta);
+        if (tp->t_rextsize_delta) {
+                be32_add(&sbp->sb_rextsize, tp->t_rextsize_delta);
                 whole = 1;
         }
-        if (tp->t_rbmblocks_delta != 0) {
-                INT_MOD(sbp->sb_rbmblocks, ARCH_CONVERT, tp->t_rbmblocks_delta);
+        if (tp->t_rbmblocks_delta) {
+                be32_add(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
                 whole = 1;
         }
-        if (tp->t_rblocks_delta != 0) {
-                INT_MOD(sbp->sb_rblocks, ARCH_CONVERT, tp->t_rblocks_delta);
+        if (tp->t_rblocks_delta) {
+                be64_add(&sbp->sb_rblocks, tp->t_rblocks_delta);
                 whole = 1;
         }
-        if (tp->t_rextents_delta != 0) {
-                INT_MOD(sbp->sb_rextents, ARCH_CONVERT, tp->t_rextents_delta);
+        if (tp->t_rextents_delta) {
+                be64_add(&sbp->sb_rextents, tp->t_rextents_delta);
                 whole = 1;
         }
-        if (tp->t_rextslog_delta != 0) {
-                INT_MOD(sbp->sb_rextslog, ARCH_CONVERT, tp->t_rextslog_delta);
+        if (tp->t_rextslog_delta) {
+                sbp->sb_rextslog += tp->t_rextslog_delta;
                 whole = 1;
         }
 
@@ -624,14 +618,14 @@ xfs_trans_apply_sb_deltas(
                 /*
                  * Log the whole thing, the fields are noncontiguous.
                  */
-                xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_sb_t) - 1);
+                xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
         else
                 /*
                  * Since all the modifiable fields are contiguous, we
                  * can get away with this.
                  */
-                xfs_trans_log_buf(tp, bp, offsetof(xfs_sb_t, sb_icount),
-                                  offsetof(xfs_sb_t, sb_frextents) +
+                xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
+                                  offsetof(xfs_dsb_t, sb_frextents) +
                                   sizeof(sbp->sb_frextents) - 1);
 
         XFS_MTOVFS(tp->t_mountp)->vfs_super->s_dirt = 1;