[LU-12505] mounting bigalloc enabled large OST takes a long time

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Labels: e2fsprogs
• Environment: master
• Severity: 3
• Assignee: Dongyang Li
• Reporter: Shuichi Ihara

Description

Not only Lustre OST, but also when OSS mounts large OST device which 'bigalloc' is enabled, it takes huge amount of time to complete.

# time mount -t ldiskfs /dev/ddn/scratch0_ost0000 /lustre/scratch0/ost0000

real    12m32.153s
user    0m0.000s
sys     11m49.887s

# dumpe2fs -h /dev/ddn/scratch0_ost0000
dumpe2fs 1.45.2.wc1 (27-May-2019)
Filesystem volume name:   scratch0-OST0000
Last mounted on:          /
Filesystem UUID:          1ca9dd81-8b70-4805-a430-78b0eafc1c45
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr dir_index filetype needs_recovery meta_bg extent 64bit mmp flex_bg sparse_super large_file huge_file uninit_bg dir_nlink quota bigalloc
Filesystem flags:         signed_directory_hash 
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              1074397184
Block count:              275045679104
Reserved block count:     2750456791
Free blocks:              274909403680
Free inodes:              1074396851
First block:              0
Block size:               4096
Cluster size:             131072
Group descriptor size:    64
Blocks per group:         1048576
Clusters per group:       32768
Inodes per group:         4096
Inode blocks per group:   512
RAID stride:              512
RAID stripe width:        512
Flex block group size:    256
Filesystem created:       Mon Jul  1 00:43:14 2019
Last mount time:          Wed Jul  3 05:55:22 2019
Last write time:          Wed Jul  3 05:55:22 2019
Mount count:              8
Maximum mount count:      -1
Last checked:             Mon Jul  1 00:43:14 2019
Check interval:           0 (<none>)
Lifetime writes:          2693 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               512
Required extra isize:     32
Desired extra isize:      32
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      4eeb2234-062d-4af5-8973-872baabd2e9f
Journal backup:           inode blocks
MMP block number:         131680
MMP update interval:      5
User quota inode:         3
Group quota inode:        4
Journal features:         journal_incompat_revoke journal_64bit
Journal size:             4096M
Journal length:           1048576
Journal sequence:         0x00000494
Journal start:            0
MMP_block:
    mmp_magic: 0x4d4d50
    mmp_check_interval: 10
    mmp_sequence: 0x0000cd
    mmp_update_date: Wed Jul  3 06:00:33 2019
    mmp_update_time: 1562133633
    mmp_node_name: es18k-vm11
    mmp_device_name: sda

Without bigalloc

# time mount -t ldiskfs /dev/ddn/scratch0_ost0000 /lustre/scratch0/ost0000

real	0m6.484s
user	0m0.000s
sys	0m4.954s

Issue Links

• is related to: LU-13604 rebase Lustre e2fsprogs onto 1.45.6