1 files changed, 87 insertions, 80 deletions

diff --git a/fs/xfs/xfs_sb.h b/fs/xfs/xfs_sb.h
index 3f8cf1587f4c..1ed71916e4c9 100644
--- a/fs/xfs/xfs_sb.h
+++ b/fs/xfs/xfs_sb.h
@@ -79,6 +79,7 @@ struct xfs_mount;
 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT  0x00000002      /* Superblk counters */
 #define XFS_SB_VERSION2_RESERVED4BIT    0x00000004
 #define XFS_SB_VERSION2_ATTR2BIT        0x00000008      /* Inline attr rework */
+#define XFS_SB_VERSION2_PARENTBIT       0x00000010      /* parent pointers */
 
 #define XFS_SB_VERSION2_OKREALFBITS     \
         (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
@@ -296,30 +297,34 @@ typedef enum {
 
 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
 
-#ifdef __KERNEL__
 static inline int xfs_sb_good_version(xfs_sb_t *sbp)
 {
-        return (((sbp->sb_versionnum >= XFS_SB_VERSION_1) && \
-                  (sbp->sb_versionnum <= XFS_SB_VERSION_3)) || \
-                   ((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                    !((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) || \
-                      ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && \
-                       (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS))) && \
-                    (sbp->sb_shared_vn <= XFS_SB_MAX_SHARED_VN)));
-}
+        /* We always support version 1-3 */
+        if (sbp->sb_versionnum >= XFS_SB_VERSION_1 &&
+            sbp->sb_versionnum <= XFS_SB_VERSION_3)
+                return 1;
+
+        /* We support version 4 if all feature bits are supported */
+        if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) {
+                if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) ||
+                    ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
+                     (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS)))
+                        return 0;
+
+#ifdef __KERNEL__
+                if (sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
+                        return 0;
 #else
-static inline int xfs_sb_good_version(xfs_sb_t *sbp)
-{
-        return (((sbp->sb_versionnum >= XFS_SB_VERSION_1) && \
-                  (sbp->sb_versionnum <= XFS_SB_VERSION_3)) || \
-                   ((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                    !((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) || \
-                      ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && \
-                       (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS))) && \
-                  (!(sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT) || \
-                   (sbp->sb_shared_vn <= XFS_SB_MAX_SHARED_VN))));
+                if ((sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT) &&
+                    sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
+                        return 0;
+#endif
+
+                return 1;
+        }
+
+        return 0;
 }
-#endif /* __KERNEL__ */
 
 /*
  * Detect a mismatched features2 field.  Older kernels read/wrote
@@ -332,123 +337,127 @@ static inline int xfs_sb_has_mismatched_features2(xfs_sb_t *sbp)
 
 static inline unsigned xfs_sb_version_tonew(unsigned v)
 {
-        return ((((v) == XFS_SB_VERSION_1) ? \
-                0 : \
-                (((v) == XFS_SB_VERSION_2) ? \
-                        XFS_SB_VERSION_ATTRBIT : \
-                        (XFS_SB_VERSION_ATTRBIT | XFS_SB_VERSION_NLINKBIT))) | \
-                XFS_SB_VERSION_4);
+        if (v == XFS_SB_VERSION_1)
+                return XFS_SB_VERSION_4;
+
+        if (v == XFS_SB_VERSION_2)
+                return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
+
+        return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT |
+                XFS_SB_VERSION_NLINKBIT;
 }
 
 static inline unsigned xfs_sb_version_toold(unsigned v)
 {
-        return (((v) & (XFS_SB_VERSION_QUOTABIT | XFS_SB_VERSION_ALIGNBIT)) ? \
-                0 : \
-                (((v) & XFS_SB_VERSION_NLINKBIT) ? \
-                        XFS_SB_VERSION_3 : \
-                        (((v) & XFS_SB_VERSION_ATTRBIT) ?  \
-                                XFS_SB_VERSION_2 : \
-                                XFS_SB_VERSION_1)));
+        if (v & (XFS_SB_VERSION_QUOTABIT | XFS_SB_VERSION_ALIGNBIT))
+                return 0;
+        if (v & XFS_SB_VERSION_NLINKBIT)
+                return XFS_SB_VERSION_3;
+        if (v & XFS_SB_VERSION_ATTRBIT)
+                return XFS_SB_VERSION_2;
+        return XFS_SB_VERSION_1;
 }
 
 static inline int xfs_sb_version_hasattr(xfs_sb_t *sbp)
 {
-        return ((sbp)->sb_versionnum == XFS_SB_VERSION_2) || \
-                 ((sbp)->sb_versionnum == XFS_SB_VERSION_3) || \
-                 ((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                  ((sbp)->sb_versionnum & XFS_SB_VERSION_ATTRBIT));
+        return sbp->sb_versionnum == XFS_SB_VERSION_2 ||
+                sbp->sb_versionnum == XFS_SB_VERSION_3 ||
+                (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+                 (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT));
 }
 
 static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
 {
-        (sbp)->sb_versionnum = (((sbp)->sb_versionnum == XFS_SB_VERSION_1) ? \
-                XFS_SB_VERSION_2 : \
-                ((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) ? \
-                        ((sbp)->sb_versionnum | XFS_SB_VERSION_ATTRBIT) : \
-                        (XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT)));
+        if (sbp->sb_versionnum == XFS_SB_VERSION_1)
+                sbp->sb_versionnum = XFS_SB_VERSION_2;
+        else if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
+                sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
+        else
+                sbp->sb_versionnum = XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
 }
 
 static inline int xfs_sb_version_hasnlink(xfs_sb_t *sbp)
 {
-        return ((sbp)->sb_versionnum == XFS_SB_VERSION_3) || \
-                 ((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                  ((sbp)->sb_versionnum & XFS_SB_VERSION_NLINKBIT));
+        return sbp->sb_versionnum == XFS_SB_VERSION_3 ||
+                 (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+                  (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT));
 }
 
 static inline void xfs_sb_version_addnlink(xfs_sb_t *sbp)
 {
-        (sbp)->sb_versionnum = ((sbp)->sb_versionnum <= XFS_SB_VERSION_2 ? \
-                XFS_SB_VERSION_3 : \
-                ((sbp)->sb_versionnum | XFS_SB_VERSION_NLINKBIT));
+        if (sbp->sb_versionnum <= XFS_SB_VERSION_2)
+                sbp->sb_versionnum = XFS_SB_VERSION_3;
+        else
+                sbp->sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
 }
 
 static inline int xfs_sb_version_hasquota(xfs_sb_t *sbp)
 {
-        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                ((sbp)->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
+        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+                (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
 }
 
 static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
 {
-        (sbp)->sb_versionnum = \
-                 (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 ? \
-                        ((sbp)->sb_versionnum | XFS_SB_VERSION_QUOTABIT) : \
-                        (xfs_sb_version_tonew((sbp)->sb_versionnum) | \
-                         XFS_SB_VERSION_QUOTABIT));
+        if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
+                sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
+        else
+                sbp->sb_versionnum = xfs_sb_version_tonew(sbp->sb_versionnum) |
+                                        XFS_SB_VERSION_QUOTABIT;
 }
 
 static inline int xfs_sb_version_hasalign(xfs_sb_t *sbp)
 {
-        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                ((sbp)->sb_versionnum & XFS_SB_VERSION_ALIGNBIT);
+        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+                (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT);
 }
 
 static inline int xfs_sb_version_hasdalign(xfs_sb_t *sbp)
 {
-        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                ((sbp)->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
+        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+                (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
 }
 
 static inline int xfs_sb_version_hasshared(xfs_sb_t *sbp)
 {
-        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                ((sbp)->sb_versionnum & XFS_SB_VERSION_SHAREDBIT);
+        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+                (sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT);
 }
 
 static inline int xfs_sb_version_hasdirv2(xfs_sb_t *sbp)
 {
-        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                ((sbp)->sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
+        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+                (sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
 }
 
 static inline int xfs_sb_version_haslogv2(xfs_sb_t *sbp)
 {
-        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                ((sbp)->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
+        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+                (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
 }
 
 static inline int xfs_sb_version_hasextflgbit(xfs_sb_t *sbp)
 {
-        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                ((sbp)->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
+        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+                (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
 }
 
 static inline int xfs_sb_version_hassector(xfs_sb_t *sbp)
 {
-        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                ((sbp)->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
+        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+                (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
 }
 
 static inline int xfs_sb_version_hasasciici(xfs_sb_t *sbp)
 {
-        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
+        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
                 (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
 }
 
 static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
 {
-        return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
-                ((sbp)->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
+        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+                (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
 }
 
 /*
@@ -463,22 +472,20 @@ static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
 
 static inline int xfs_sb_version_haslazysbcount(xfs_sb_t *sbp)
 {
-        return (xfs_sb_version_hasmorebits(sbp) &&      \
-                ((sbp)->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
+        return xfs_sb_version_hasmorebits(sbp) &&
+                (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT);
 }
 
 static inline int xfs_sb_version_hasattr2(xfs_sb_t *sbp)
 {
-        return (xfs_sb_version_hasmorebits(sbp)) &&     \
-                ((sbp)->sb_features2 & XFS_SB_VERSION2_ATTR2BIT);
+        return xfs_sb_version_hasmorebits(sbp) &&
+                (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT);
 }
 
 static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
 {
-        ((sbp)->sb_versionnum = \
-                ((sbp)->sb_versionnum | XFS_SB_VERSION_MOREBITSBIT),    \
-        ((sbp)->sb_features2 =  \
-                ((sbp)->sb_features2 | XFS_SB_VERSION2_ATTR2BIT)));
+        sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
+        sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
 }
 
 static inline void xfs_sb_version_removeattr2(xfs_sb_t *sbp)