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Date: Thu, 1 Aug 2013 22:46:39 +0200 From: Christian Nilsson <nikize@...il.com> To: linux-ext4@...r.kernel.org Subject: resize2fs ext4 shrink corruption? Hi, This is half a support request and half a possible issue. - sorry about that. Got some fs problems after resize. Shrink of ext4 fs from ~6.8TB to ~5.5TB now getting fs errors, is this expected or can someone see a reason for it going wrong? (anyone seen this before? Could not find similar issues reported, except for other features enabled.) And are there anything better to do to recover then a fsck? Test run of fsck -y is in progress and not yet complete. Some commands and output below (underlaying md3 as of this posting not yet shrunk) # resize2fs -d 31 -p /dev/md3 5545605120K > md3shrink.log (log is 16GB uncompressed bz2 is 1.7G) estimated runtime maybe ~24h(?) (i started of by reading source code and canceling on block move because of no output or status messages at all, and on that not i sugest using xx% compleate instead of those XXX if possible since any other output will change the layout of them.) # dumpe2fs /dev/md3 > md3_dumpe2fs.full let me know if any of these log files are of interest. and I will make them available. # dumpe2fs -h /dev/md3 Filesystem volume name: data Last mounted on: /data Filesystem UUID: 70131c5d-de06-4349-954e-6f0d9ef3538c Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent sparse_super large_file uninit_bg Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 346603520 Block count: 1386401280 Reserved block count: 69303139 Free blocks: 31526436 Free inodes: 346589276 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 693 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 RAID stride: 16 RAID stripe width: 112 Filesystem created: Tue Apr 22 23:51:00 2008 Last mount time: Sun Feb 3 15:52:25 2013 Last write time: Thu Aug 1 10:21:05 2013 Mount count: 0 Maximum mount count: 35 Last checked: Tue Jul 30 13:03:01 2013 Check interval: 15552000 (6 months) Next check after: Sun Jan 26 12:03:01 2014 Lifetime writes: 1738 GB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Journal inode: 8 Default directory hash: tea Directory Hash Seed: cd66ced7-b600-43c2-82ef-b0971239f822 Journal backup: inode blocks Journal features: journal_incompat_revoke Journal size: 128M Journal length: 32768 Journal sequence: 0x00dcfa88 Journal start: 0 # fsck.ext4 -C0 -n /dev/md3 > md3fsck_errs.log estimated runtime ~5h Here is part of the output the "Illegal block number" is not in the logfile. (actually from separate run) e2fsck 1.42.7 (21-Jan-2013) ext2fs_check_desc: Corrupt group descriptor: bad block for block bitmap e2fsck: Group descriptors look bad... trying backup blocks... Block bitmap for group 42309 is not in group. (block 1386413648) Relocate? no Inode bitmap for group 42309 is not in group. (block 1386413649) Relocate? no data contains a file system with errors, check forced. Pass 1: Checking inodes, blocks, and sizes Illegal block number passed to ext2fs_test_block_bitmap #1386413648 for in-use block map Illegal block number passed to ext2fs_mark_block_bitmap #1386413648 for in-use block map Illegal block number passed to ext2fs_test_block_bitmap #1386413649 for in-use block map Illegal block number passed to ext2fs_mark_block_bitmap #1386413649 for in-use block map Interior extent node level 1 of inode 357: Logical start 36672 does not match logical start 36863 at next level. Fix? no Interior extent node level 1 of inode 357: Logical start 46464 does not match logical start 46591 at next level. Fix? no Interior extent node level 1 of inode 357: Logical start 140096 does not match logical start 140159 at next level. Fix? no Interior extent node level 1 of inode 363: Logical start 46656 does not match logical start 46783 at next level. Fix? no [...snip...] Interior extent node level 0 of inode 267124739: Logical start 38784 does not match logical start 39039 at next level. Fix? no Interior extent node level 1 of inode 315826185: Logical start 25728 does not match logical start 25855 at next level. Fix? no Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information data: ********** WARNING: Filesystem still has errors ********** data: 14244/346603520 files (31.6% non-contiguous), 1354874844/1386401280 blocks Before i do a fsck on the device, let's see if any of the files are available... # mount /dev/md3 /mnt/floppy -r mount: wrong fs type ... Nope, Ok lets create a cow image we can use to test the result of fsck # qemu-img create -f qcow2 -o backing_file=/dev/md3 md3.qcow2 Formatting 'md3.qcow2', fmt=qcow2 size=7571599523840 backing_file='/dev/md3' encryption=off cluster_size=65536 # qemu-nbd -c /dev/nbd1 md3.qcow2 # e2fsck -C0 /dev/nbd1 e2fsck 1.42.7 (21-Jan-2013) ext2fs_check_desc: Corrupt group descriptor: bad block for block bitmap e2fsck: Group descriptors look bad... trying backup blocks... Block bitmap for group 42309 is not in group. (block 1386413648) Relocate<y>? yes Inode bitmap for group 42309 is not in group. (block 1386413649) Relocate<y>? yes One or more block group descriptor checksums are invalid. Fix<y>? yes Group descriptor 42309 checksum is 0x561b, should be 0xf661. FIXED. data contains a file system with errors, check forced. Pass 1: Checking inodes, blocks, and sizes Interior extent node level 1 of inode 357: Logical start 36672 does not match logical start 36863 at next level. Fix<y>? yes Interior extent node level 1 of inode 357: Logical start 46464 does not match logical start 46591 at next level. Fix<y>? yes ... and waiting on 33%, qcow image at 5.8MB Any pointers at all would be greatly appreciated. /Christian -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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