Hi Andreas,
Trying to resize a mounted ext3 filesystem fails due to small journal size.
Background :
The filesystem was created with default values, except blocksize = 4K on
a LV partition. Later we tried extended the partition to +16M and tried
to resize the fs using resize2fs, while it was mounted.
[root@llm47 ~]# resize2fs /dev/mapper/testvg-tmp
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/mapper/testvg-tmp is mounted on /tmp; on-line
resizing required
Performing an on-line resize of /dev/mapper/testvg-tmp to 186368 (4k)
blocks.
resize2fs: No space left on device While trying to add group #4
Analysis :
While adding the new blockgroup, inside setup_new_group_blocks() we hit
the limit because we are requesting for a a credit value of 2 +
sbi->s_itb_per_group which in the case of the file system below is 1026
while the max_transaction credits possible is 1024 for the fs.
journal->j_maxlen = inode->i_size / blocksize = 16M/4K = 4K
journal->j_max_transaction_buffers = journal->j_maxlen / 4 = 1K
journal->j_max_transaction_buffers = 1024.
# dumpe2fs /dev/mapper/testvg-tmp
dumpe2fs 1.39 (29-May-2006)
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: 7d82f07b-cb22-4c7d-b290-a35749121bbb
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal resize_inode dir_index filetype
needs_recovery sparse_super large_file
Default mount options: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 131072
Block count: 131072
Reserved block count: 6553
Free blocks: 122753
Free inodes: 131056
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 31
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 32768
Inode blocks per group: 1024
Filesystem created: Mon Jul 9 00:09:23 2007
Last mount time: Tue Jul 10 02:44:44 2007
Last write time: Tue Jul 10 02:44:44 2007
Mount count: 7
Maximum mount count: 33
Last checked: Mon Jul 9 00:09:23 2007
Check interval: 15552000 (6 months)
Next check after: Sat Jan 5 00:09:23 2008
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
Journal inode: 8
Default directory hash: tea
Directory Hash Seed: 0a57077d-9778-4f3a-8605-7f0c86f18d8a
Journal backup: inode blocks
Journal size: 16M
Group 0: (Blocks 0-32767)
Primary superblock at 0, Group descriptors at 1-1
Reserved GDT blocks at 2-32
Block bitmap at 33 (+33), Inode bitmap at 34 (+34)
Inode table at 35-1058 (+35)
27600 free blocks, 32755 free inodes, 2 directories
Free blocks: 5168-32767
Free inodes: 14-32768
Group 1: (Blocks 32768-65535)
Backup superblock at 32768, Group descriptors at 32769-32769
Reserved GDT blocks at 32770-32800
Block bitmap at 32801 (+33), Inode bitmap at 32802 (+34)
Inode table at 32803-33826 (+35)
31708 free blocks, 32767 free inodes, 1 directories
Free blocks: 33828-65535
Free inodes: 32770-65536
Group 2: (Blocks 65536-98303)
Block bitmap at 65536 (+0), Inode bitmap at 65537 (+1)
Inode table at 65538-66561 (+2)
31740 free blocks, 32764 free inodes, 2 directories
Free blocks: 66562-83967, 83969-94207, 94209-98303
Free inodes: 65541-98304
Group 3: (Blocks 98304-131071)
Backup superblock at 98304, Group descriptors at 98305-98305
Reserved GDT blocks at 98306-98336
Block bitmap at 98337 (+33), Inode bitmap at 98338 (+34)
Inode table at 98339-99362 (+35)
31704 free blocks, 32766 free inodes, 1 directories
Free blocks: 99363-126976, 126982-131071
Free inodes: 98305, 98308-131072
Is this a supported operation ? If yes, what could be the best way to
fix it ?
Resizing the journal is not supported at the moment :(.
Thoughts ?
Thanks
Suzuki
IBM Linux Technology Centre
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