resize2fs test
Creating filesystem with 786432 1k blocks and 98304 inodes
Superblock backups stored on blocks: 
	8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409, 663553

Allocating group tables:      done                            
Writing inode tables:      done                            
Creating journal (16384 blocks): done
Creating 727 huge file(s) with 1024 blocks each: done
Writing superblocks and filesystem accounting information:      done

Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

Exit status is 0
resize2fs test.img -b
Converting the filesystem to 64-bit.
The filesystem on test.img is now 786432 (1k) blocks long.

Exit status is 0
Change in FS metadata:
@@ -2,7 +2,7 @@
 Last mounted on:          <not available>
 Filesystem magic number:  0xEF53
 Filesystem revision #:    1 (dynamic)
-Filesystem features:      has_journal ext_attr dir_index filetype extent sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
+Filesystem features:      has_journal ext_attr dir_index filetype extent 64bit sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
 Default mount options:    user_xattr acl
 Filesystem state:         clean
 Errors behavior:          Continue
@@ -10,12 +10,12 @@
 Inode count:              98304
 Block count:              786432
 Reserved block count:     39321
-Overhead clusters:        41193
-Free blocks:              764
+Free blocks:              734
 Free inodes:              97566
 First block:              1
 Block size:               1024
 Fragment size:            1024
+Group descriptor size:    64
 Blocks per group:         8192
 Fragments per group:      8192
 Inodes per group:         1024
@@ -41,16 +41,16 @@
 
 
 group:block:super:gdt:bbitmap:ibitmap:itable
-0:1:1:2-4:5:6:7
-1:8193:8193:8194-8196:8197:8198:8199
+0:1:1:2-7:8:9:10
+1:8193:8193:8194-8199:8200:8201:8202
 2:16385:-1:-1:16385:16386:16387
-3:24577:24577:24578-24580:24581:24582:24583
+3:24577:24577:24578-24583:24584:24585:24586
 4:32769:-1:-1:32769:32770:32771
-5:40961:40961:40962-40964:40965:40966:40967
+5:40961:40961:40962-40967:40968:40969:40970
 6:49153:-1:-1:49153:49154:49155
-7:57345:57345:57346-57348:57349:57350:57351
+7:57345:57345:57346-57351:57352:57353:57354
 8:65537:-1:-1:65537:65538:65539
-9:73729:73729:73730-73732:73733:73734:73735
+9:73729:73729:73730-73735:73736:73737:73738
 10:81921:-1:-1:81921:81922:81923
 11:90113:-1:-1:90113:90114:90115
 12:98305:-1:-1:98305:98306:98307
@@ -66,9 +66,9 @@
 22:180225:-1:-1:180225:180226:180227
 23:188417:-1:-1:188417:188418:188419
 24:196609:-1:-1:196609:196610:196611
-25:204801:204801:204802-204804:204805:204806:204807
+25:204801:204801:204802-204807:204808:204809:204810
 26:212993:-1:-1:212993:212994:212995
-27:221185:221185:221186-221188:221189:221190:221191
+27:221185:221185:221186-221191:221192:221193:221194
 28:229377:-1:-1:229377:229378:229379
 29:237569:-1:-1:237569:237570:237571
 30:245761:-1:-1:245761:245762:245763
@@ -90,7 +90,7 @@
 46:376833:-1:-1:376833:376834:376835
 47:385025:-1:-1:385025:385026:385027
 48:393217:-1:-1:393217:393218:393219
-49:401409:401409:401410-401412:401413:401414:401415
+49:401409:401409:401410-401415:401416:401417:401418
 50:409601:-1:-1:409601:409602:409603
 51:417793:-1:-1:417793:417794:417795
 52:425985:-1:-1:425985:425986:425987
@@ -122,7 +122,7 @@
 78:638977:-1:-1:638977:638978:638979
 79:647169:-1:-1:647169:647170:647171
 80:655361:-1:-1:655361:655362:655363
-81:663553:663553:663554-663556:663557:663558:663559
+81:663553:663553:663554-663559:663560:663561:663562
 82:671745:-1:-1:671745:671746:671747
 83:679937:-1:-1:679937:679938:679939
 84:688129:-1:-1:688129:688130:688131
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

Exit status is 0