[PATCH 30/47] resize2fs: don't play stupid games with the block count

["Darrick J. Wong" <darrick.wong@oracle.com>]

While it may be true that playing games with old_fs' block count
during a grow operation shuts up a bunch of warnings, resize2fs
doesn't actually expand the group descriptor array to match the size
we're artificially stuffing into old_fs, which means that if we
actually need to allocate a block out of the larger fs (i.e. we're in
desperation mode), ext2fs_block_alloc_stats2() scribbles on the heap,
leading to crashes if you're lucky and FS corruption if not.

So, rip that piece out and turn off com_err warnings properly and add
a test case to deal with growing a nearly full filesystem.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 resize/resize2fs.c         |   19 +-
 tests/r_expand_full/expect |  375 ++++++++++++++++++++++++++++++++++++++++++++
 tests/r_expand_full/name   |    1 
 tests/r_expand_full/script |   79 +++++++++
 4 files changed, 462 insertions(+), 12 deletions(-)
 create mode 100644 tests/r_expand_full/expect
 create mode 100644 tests/r_expand_full/name
 create mode 100644 tests/r_expand_full/script


diff --git a/resize/resize2fs.c b/resize/resize2fs.c
index a760593..0d1f7fa 100644
--- a/resize/resize2fs.c
+++ b/resize/resize2fs.c
@@ -1629,6 +1629,11 @@ out:
 	return errcode;
 }
 
+static void quiet_com_err_proc(const char *whoami, errcode_t code,
+			       const char *fmt, va_list args)
+{
+}
+
 static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
 {
 	struct process_block_struct	pb;
@@ -1638,7 +1643,6 @@ static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
 	errcode_t		retval;
 	char			*block_buf = 0;
 	ext2_ino_t		start_to_move;
-	blk64_t			orig_size;
 	int			inode_size;
 
 	if ((rfs->old_fs->group_desc_count <=
@@ -1646,16 +1650,7 @@ static errcode_t inode_scan_and_fix(ext2_resize_t rfs)
 	    !rfs->bmap)
 		return 0;
 
-	/*
-	 * Save the original size of the old filesystem, and
-	 * temporarily set the size to be the new size if the new size
-	 * is larger.  We need to do this to avoid catching an error
-	 * by the block iterator routines
-	 */
-	orig_size = ext2fs_blocks_count(rfs->old_fs->super);
-	if (orig_size < ext2fs_blocks_count(rfs->new_fs->super))
-		ext2fs_blocks_count_set(rfs->old_fs->super,
-				ext2fs_blocks_count(rfs->new_fs->super));
+	set_com_err_hook(quiet_com_err_proc);
 
 	retval = ext2fs_open_inode_scan(rfs->old_fs, 0, &scan);
 	if (retval) goto errout;
@@ -1791,7 +1786,7 @@ remap_blocks:
 	io_channel_flush(rfs->old_fs->io);
 
 errout:
-	ext2fs_blocks_count_set(rfs->old_fs->super, orig_size);
+	reset_com_err_hook();
 	if (rfs->bmap) {
 		ext2fs_free_extent_table(rfs->bmap);
 		rfs->bmap = 0;
diff --git a/tests/r_expand_full/expect b/tests/r_expand_full/expect
new file mode 100644
index 0000000..c80baa2
--- /dev/null
+++ b/tests/r_expand_full/expect
@@ -0,0 +1,375 @@
+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:      \b\b\b\b\bdone                            
+Writing inode tables:      \b\b\b\b\bdone                            
+Creating journal (16384 blocks): done
+Creating 727 huge file(s) with 1024 blocks each: done
+Writing superblocks and filesystem accounting information:      \b\b\b\b\bdone
+
+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
+Resizing the filesystem on test.img to 3145728 (1k) blocks.
+The filesystem on test.img is now 3145728 (1k) blocks long.
+
+Exit status is 0
+Change in FS metadata:
+@@ -1,15 +1,15 @@
+ 
+ group:block:super:gdt:bbitmap:ibitmap:itable
+-0:1:1:2-4:5:6:7
+-1:8193:8193:8194-8196:8197:8198:8199
++0:1:1:2-13:263:264:265
++1:8193:8193:8194-8205:8455:8456:8457
+ 2:16385:-1:-1:16385:16386:16387
+-3:24577:24577:24578-24580:24581:24582:24583
++3:24577:24577:24578-24589:24839:24840:24841
+ 4:32769:-1:-1:32769:32770:32771
+-5:40961:40961:40962-40964:40965:40966:40967
++5:40961:40961:40962-40973:41223:41224:41225
+ 6:49153:-1:-1:49153:49154:49155
+-7:57345:57345:57346-57348:57349:57350:57351
++7:57345:57345:57346-57357:57607:57608:57609
+ 8:65537:-1:-1:65537:65538:65539
+-9:73729:73729:73730-73732:73733:73734:73735
++9:73729:73729:73730-73741:73991:73992:73993
+ 10:81921:-1:-1:81921:81922:81923
+ 11:90113:-1:-1:90113:90114:90115
+ 12:98305:-1:-1:98305:98306:98307
+@@ -25,9 +25,9 @@
+ 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
++25:204801:204801:204802-204813:205063:205064:205065
+ 26:212993:-1:-1:212993:212994:212995
+-27:221185:221185:221186-221188:221189:221190:221191
++27:221185:221185:221186-221197:221447:221448:221449
+ 28:229377:-1:-1:229377:229378:229379
+ 29:237569:-1:-1:237569:237570:237571
+ 30:245761:-1:-1:245761:245762:245763
+@@ -49,7 +49,7 @@
+ 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
++49:401409:401409:401410-401421:401671:401672:401673
+ 50:409601:-1:-1:409601:409602:409603
+ 51:417793:-1:-1:417793:417794:417795
+ 52:425985:-1:-1:425985:425986:425987
+@@ -81,7 +81,7 @@
+ 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
++81:663553:663553:663554-663565:663815:663816:663817
+ 82:671745:-1:-1:671745:671746:671747
+ 83:679937:-1:-1:679937:679938:679939
+ 84:688129:-1:-1:688129:688130:688131
+@@ -96,3 +96,291 @@
+ 93:761857:-1:-1:761857:761858:761859
+ 94:770049:-1:-1:770049:770050:770051
+ 95:778241:-1:-1:778241:778242:778243
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++99:811009:-1:-1:811009:811010:811011
++100:819201:-1:-1:819201:819202:819203
++101:827393:-1:-1:827393:827394:827395
++102:835585:-1:-1:835585:835586:835587
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++104:851969:-1:-1:851969:851970:851971
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++323:2646017:-1:-1:2646017:2646018:2646019
++324:2654209:-1:-1:2654209:2654210:2654211
++325:2662401:-1:-1:2662401:2662402:2662403
++326:2670593:-1:-1:2670593:2670594:2670595
++327:2678785:-1:-1:2678785:2678786:2678787
++328:2686977:-1:-1:2686977:2686978:2686979
++329:2695169:-1:-1:2695169:2695170:2695171
++330:2703361:-1:-1:2703361:2703362:2703363
++331:2711553:-1:-1:2711553:2711554:2711555
++332:2719745:-1:-1:2719745:2719746:2719747
++333:2727937:-1:-1:2727937:2727938:2727939
++334:2736129:-1:-1:2736129:2736130:2736131
++335:2744321:-1:-1:2744321:2744322:2744323
++336:2752513:-1:-1:2752513:2752514:2752515
++337:2760705:-1:-1:2760705:2760706:2760707
++338:2768897:-1:-1:2768897:2768898:2768899
++339:2777089:-1:-1:2777089:2777090:2777091
++340:2785281:-1:-1:2785281:2785282:2785283
++341:2793473:-1:-1:2793473:2793474:2793475
++342:2801665:-1:-1:2801665:2801666:2801667
++343:2809857:2809857:2809858-2809869:2809870:2809871:2809872
++344:2818049:-1:-1:2818049:2818050:2818051
++345:2826241:-1:-1:2826241:2826242:2826243
++346:2834433:-1:-1:2834433:2834434:2834435
++347:2842625:-1:-1:2842625:2842626:2842627
++348:2850817:-1:-1:2850817:2850818:2850819
++349:2859009:-1:-1:2859009:2859010:2859011
++350:2867201:-1:-1:2867201:2867202:2867203
++351:2875393:-1:-1:2875393:2875394:2875395
++352:2883585:-1:-1:2883585:2883586:2883587
++353:2891777:-1:-1:2891777:2891778:2891779
++354:2899969:-1:-1:2899969:2899970:2899971
++355:2908161:-1:-1:2908161:2908162:2908163
++356:2916353:-1:-1:2916353:2916354:2916355
++357:2924545:-1:-1:2924545:2924546:2924547
++358:2932737:-1:-1:2932737:2932738:2932739
++359:2940929:-1:-1:2940929:2940930:2940931
++360:2949121:-1:-1:2949121:2949122:2949123
++361:2957313:-1:-1:2957313:2957314:2957315
++362:2965505:-1:-1:2965505:2965506:2965507
++363:2973697:-1:-1:2973697:2973698:2973699
++364:2981889:-1:-1:2981889:2981890:2981891
++365:2990081:-1:-1:2990081:2990082:2990083
++366:2998273:-1:-1:2998273:2998274:2998275
++367:3006465:-1:-1:3006465:3006466:3006467
++368:3014657:-1:-1:3014657:3014658:3014659
++369:3022849:-1:-1:3022849:3022850:3022851
++370:3031041:-1:-1:3031041:3031042:3031043
++371:3039233:-1:-1:3039233:3039234:3039235
++372:3047425:-1:-1:3047425:3047426:3047427
++373:3055617:-1:-1:3055617:3055618:3055619
++374:3063809:-1:-1:3063809:3063810:3063811
++375:3072001:-1:-1:3072001:3072002:3072003
++376:3080193:-1:-1:3080193:3080194:3080195
++377:3088385:-1:-1:3088385:3088386:3088387
++378:3096577:-1:-1:3096577:3096578:3096579
++379:3104769:-1:-1:3104769:3104770:3104771
++380:3112961:-1:-1:3112961:3112962:3112963
++381:3121153:-1:-1:3121153:3121154:3121155
++382:3129345:-1:-1:3129345:3129346:3129347
++383:3137537:-1:-1:3137537:3137538:3137539
+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
diff --git a/tests/r_expand_full/name b/tests/r_expand_full/name
new file mode 100644
index 0000000..af40cba
--- /dev/null
+++ b/tests/r_expand_full/name
@@ -0,0 +1 @@
+expand a totally full filesystem
diff --git a/tests/r_expand_full/script b/tests/r_expand_full/script
new file mode 100644
index 0000000..a2c09db
--- /dev/null
+++ b/tests/r_expand_full/script
@@ -0,0 +1,79 @@
+if test -x $RESIZE2FS_EXE -a -x $DEBUGFS_EXE; then
+
+FSCK_OPT=-fn
+OUT=$test_name.log
+EXP=$test_dir/expect
+CONF=$TMPFILE.conf
+
+#gzip -d < $EXP.gz > $EXP
+
+cat > $CONF << ENDL
+[fs_types]
+	ext4h = {
+		features = has_journal,extent,huge_file,uninit_bg,dir_nlink,extra_isize,sparse_super,filetype,dir_index,ext_attr,^resize_inode,^meta_bg,^flex_bg
+		blocksize = 1024
+		inode_size = 256
+		make_hugefiles = true
+		hugefiles_dir = /
+		hugefiles_slack = 0
+		hugefiles_name = aaaaa
+		hugefiles_digits = 4
+		hugefiles_size = 1M
+		zero_hugefiles = false
+	}
+ENDL
+
+echo "resize2fs test" > $OUT
+
+MKE2FS_CONFIG=$CONF $MKE2FS -F -T ext4h $TMPFILE 786432 >> $OUT 2>&1
+rm -rf $CONF
+
+# dump and check
+$DUMPE2FS -g $TMPFILE 2>&1 >> $OUT.before 2> /dev/null
+$FSCK $FSCK_OPT -N test_filesys $TMPFILE >> $OUT 2>&1
+status=$?
+echo Exit status is $status >> $OUT
+
+# convert it
+echo "resize2fs test.img" >> $OUT
+dd if=/dev/zero of=$TMPFILE conv=notrunc bs=1 count=1 seek=3221225471 2> /dev/null
+$RESIZE2FS -f $TMPFILE 2>&1 >> $OUT 2>&1
+status=$?
+echo Exit status is $status >> $OUT
+
+# dump and check
+$DUMPE2FS -g $TMPFILE 2>&1 >> $OUT.after 2> /dev/null
+echo "Change in FS metadata:" >> $OUT
+diff -u $OUT.before $OUT.after | tail -n +3 >> $OUT
+$FSCK $FSCK_OPT -N test_filesys $TMPFILE >> $OUT 2>&1
+status=$?
+echo Exit status is $status >> $OUT
+
+rm $TMPFILE
+
+#
+# Do the verification
+#
+
+sed -f $cmd_dir/filter.sed -e "s;$TMPFILE;test.img;" -e 's/test_filesys:.*//g' < $OUT > $OUT.new
+mv $OUT.new $OUT
+
+cmp -s $OUT $EXP
+status=$?
+
+if [ "$status" = 0 ] ; then
+	echo "$test_name: $test_description: ok"
+	touch $test_name.ok
+else
+	echo "$test_name: $test_description: failed"
+	diff $DIFF_OPTS $EXP $OUT > $test_name.failed
+fi
+
+rm $OUT.before $OUT.after
+
+unset IMAGE FSCK_OPT OUT EXP CONF
+
+else #if test -x $RESIZE2FS_EXE -a -x $DEBUGFS_EXE; then
+	echo "$test_name: $test_description: skipped"
+fi
+