1 files changed, 188 insertions, 75 deletions

diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index 04f5386446db..e58349be78bd 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -30,13 +30,110 @@
  * Physical superblock buffer manipulations. Shared with libxfs in userspace.
  */
 
+/*
+ * We support all XFS versions newer than a v4 superblock with V2 directories.
+ */
+bool
+xfs_sb_good_version(
+	struct xfs_sb	*sbp)
+{
+	/* all v5 filesystems are supported */
+	if (xfs_sb_is_v5(sbp))
+		return true;
+
+	/* versions prior to v4 are not supported */
+	if (XFS_SB_VERSION_NUM(sbp) < XFS_SB_VERSION_4)
+		return false;
+
+	/* V4 filesystems need v2 directories and unwritten extents */
+	if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
+		return false;
+	if (!(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT))
+		return false;
+
+	/* And 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;
+
+	/* 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_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;
+	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_VERSION_NUM(sbp) != XFS_SB_VERSION_5)
+	if (!xfs_sb_is_v5(sbp))
 		return 0;
 
 	/*
@@ -56,7 +153,7 @@ xfs_validate_sb_read(
 "Superblock has unknown read-only compatible features (0x%x) enabled.",
 			(sbp->sb_features_ro_compat &
 					XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
-		if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
+		if (!xfs_is_readonly(mp)) {
 			xfs_warn(mp,
 "Attempted to mount read-only compatible filesystem read-write.");
 			xfs_warn(mp,
@@ -95,7 +192,7 @@ xfs_validate_sb_write(
 	 * secondary superblocks, so allow this usage to continue because
 	 * we never read counters from such superblocks.
 	 */
-	if (XFS_BUF_ADDR(bp) == XFS_SB_DADDR && !sbp->sb_inprogress &&
+	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)) {
@@ -103,7 +200,7 @@ xfs_validate_sb_write(
 		return -EFSCORRUPTED;
 	}
 
-	if (XFS_SB_VERSION_NUM(sbp) != XFS_SB_VERSION_5)
+	if (!xfs_sb_is_v5(sbp))
 		return 0;
 
 	/*
@@ -162,6 +259,7 @@ xfs_validate_sb_common(
 	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, "bad magic number");
@@ -173,12 +271,41 @@ xfs_validate_sb_common(
 		return -EWRONGFS;
 	}
 
-	if (xfs_sb_version_has_pquotino(sbp)) {
+	/*
+	 * 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,
@@ -186,24 +313,6 @@ xfs_validate_sb_common(
 			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 (xfs_sb_version_hassparseinodes(sbp)) {
-		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;
-		}
-	}
-
 	if (unlikely(
 	    sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
 		xfs_warn(mp,
@@ -303,7 +412,8 @@ xfs_validate_sb_common(
 	 * Either (sb_unit and !hasdalign) or (!sb_unit and hasdalign)
 	 * would imply the image is corrupted.
 	 */
-	if (!!sbp->sb_unit ^ xfs_sb_version_hasdalign(sbp)) {
+	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;
 	}
@@ -312,12 +422,6 @@ xfs_validate_sb_common(
 			XFS_FSB_TO_B(mp, sbp->sb_width), 0, false))
 		return -EFSCORRUPTED;
 
-	if (xfs_sb_version_hascrc(&mp->m_sb) &&
-	    sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) {
-		xfs_notice(mp, "v5 SB sanity check failed");
-		return -EFSCORRUPTED;
-	}
-
 	/*
 	 * Currently only very few inode sizes are supported.
 	 */
@@ -361,7 +465,7 @@ xfs_sb_quota_from_disk(struct xfs_sb *sbp)
 	 * We need to do these manipilations only if we are working
 	 * with an older version of on-disk superblock.
 	 */
-	if (xfs_sb_version_has_pquotino(sbp))
+	if (xfs_sb_is_v5(sbp))
 		return;
 
 	if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
@@ -454,7 +558,8 @@ __xfs_sb_from_disk(
 	 * 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_version_hasmetauuid(to))
+	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);
@@ -479,7 +584,12 @@ xfs_sb_quota_to_disk(
 	uint16_t	qflags = from->sb_qflags;
 
 	to->sb_uquotino = cpu_to_be64(from->sb_uquotino);
-	if (xfs_sb_version_has_pquotino(from)) {
+
+	/*
+	 * 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);
@@ -487,9 +597,9 @@ xfs_sb_quota_to_disk(
 	}
 
 	/*
-	 * 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.
+	 * 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);
@@ -589,19 +699,20 @@ xfs_sb_to_disk(
 	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_spino_align = cpu_to_be32(from->sb_spino_align);
-		to->sb_lsn = cpu_to_be64(from->sb_lsn);
-		if (xfs_sb_version_hasmetauuid(from))
-			uuid_copy(&to->sb_meta_uuid, &from->sb_meta_uuid);
-	}
+	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);
 }
 
 /*
@@ -636,8 +747,8 @@ xfs_sb_read_verify(
 
 		if (!xfs_buf_verify_cksum(bp, XFS_SB_CRC_OFF)) {
 			/* Only fail bad secondaries on a known V5 filesystem */
-			if (bp->b_bn == XFS_SB_DADDR ||
-			    xfs_sb_version_hascrc(&mp->m_sb)) {
+			if (xfs_buf_daddr(bp) == XFS_SB_DADDR ||
+			    xfs_has_crc(mp)) {
 				error = -EFSBADCRC;
 				goto out_error;
 			}
@@ -704,7 +815,7 @@ xfs_sb_write_verify(
 	if (error)
 		goto out_error;
 
-	if (!xfs_sb_version_hascrc(&mp->m_sb))
+	if (!xfs_sb_is_v5(&sb))
 		return;
 
 	if (bip)
@@ -801,7 +912,7 @@ xfs_log_sb(
 	 * unclean shutdown, this will be corrected by log recovery rebuilding
 	 * the counters from the AGF block counts.
 	 */
-	if (xfs_sb_version_haslazysbcount(&mp->m_sb)) {
+	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);
@@ -950,10 +1061,12 @@ out:
 
 void
 xfs_fs_geometry(
-	struct xfs_sb		*sbp,
+	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;
@@ -984,51 +1097,51 @@ xfs_fs_geometry(
 	geo->flags = XFS_FSOP_GEOM_FLAGS_NLINK |
 		     XFS_FSOP_GEOM_FLAGS_DIRV2 |
 		     XFS_FSOP_GEOM_FLAGS_EXTFLG;
-	if (xfs_sb_version_hasattr(sbp))
+	if (xfs_has_attr(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR;
-	if (xfs_sb_version_hasquota(sbp))
+	if (xfs_has_quota(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_QUOTA;
-	if (xfs_sb_version_hasalign(sbp))
+	if (xfs_has_align(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_IALIGN;
-	if (xfs_sb_version_hasdalign(sbp))
+	if (xfs_has_dalign(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_DALIGN;
-	if (xfs_sb_version_hassector(sbp))
-		geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR;
-	if (xfs_sb_version_hasasciici(sbp))
+	if (xfs_has_asciici(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_DIRV2CI;
-	if (xfs_sb_version_haslazysbcount(sbp))
+	if (xfs_has_lazysbcount(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_LAZYSB;
-	if (xfs_sb_version_hasattr2(sbp))
+	if (xfs_has_attr2(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_ATTR2;
-	if (xfs_sb_version_hasprojid32bit(sbp))
+	if (xfs_has_projid32(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_PROJID32;
-	if (xfs_sb_version_hascrc(sbp))
+	if (xfs_has_crc(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_V5SB;
-	if (xfs_sb_version_hasftype(sbp))
+	if (xfs_has_ftype(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_FTYPE;
-	if (xfs_sb_version_hasfinobt(sbp))
+	if (xfs_has_finobt(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_FINOBT;
-	if (xfs_sb_version_hassparseinodes(sbp))
+	if (xfs_has_sparseinodes(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_SPINODES;
-	if (xfs_sb_version_hasrmapbt(sbp))
+	if (xfs_has_rmapbt(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_RMAPBT;
-	if (xfs_sb_version_hasreflink(sbp))
+	if (xfs_has_reflink(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_REFLINK;
-	if (xfs_sb_version_hasbigtime(sbp))
+	if (xfs_has_bigtime(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_BIGTIME;
-	if (xfs_sb_version_hasinobtcounts(sbp))
+	if (xfs_has_inobtcounts(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_INOBTCNT;
-	if (xfs_sb_version_hassector(sbp))
+	if (xfs_has_sector(mp)) {
+		geo->flags |= XFS_FSOP_GEOM_FLAGS_SECTOR;
 		geo->logsectsize = sbp->sb_logsectsize;
-	else
+	} else {
 		geo->logsectsize = BBSIZE;
+	}
 	geo->rtsectsize = sbp->sb_blocksize;
 	geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp);
 
 	if (struct_version < 4)
 		return;
 
-	if (xfs_sb_version_haslogv2(sbp))
+	if (xfs_has_logv2(mp))
 		geo->flags |= XFS_FSOP_GEOM_FLAGS_LOGV2;
 
 	geo->logsunit = sbp->sb_logsunit;