[Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi

[Zhangfei Gao]

Here is one question about testing virtio-scsi & vhost-scsi.
I met ext4 error using fileio or iblock.
And after the error, the filesystem can not be remount next time in
guest os except mkfs.ext4 again.

Any suggestions?
Thanks in advance.


Basic steps.
fileio:
mount /dev/sda3 /mnt
dd if=/dev/zero of=test bs=1M count=1024


#targetcli

(targetcli) /> cd backstores/fileio

(targetcli) /> create name=file_backend file_or_dev=/mnt/test size=1G

(targetcli) /> cd /vhost

(targetcli) /> create wwn=naa.60014052cc816bf4

(targetcli) /> cd naa.60014052cc816bf4/tpgt1/luns

(targetcli) /> create /backstores/fileio/file_backend

(targetcli) /> cd /

(targetcli) /> saveconfig

(targetcli) /> exit

qemu.git/aarch64-softmmu/qemu-system-aarch64 \

   -enable-kvm -nographic -kernel Image \

   -device vhost-scsi-pci,wwpn=naa.60014052cc816bf4 \

   -m 512 -M virt -cpu host \

   -append "earlyprintk console=ttyAMA0 mem=512M rw"


After guest kernel is boot,

Mkfs.ext4 /dev/sda

Mount /dev/sda /mnt


sync; date; dd if=/dev/zero of=test bs=1M count=100; sync; date;


Ext4 error:

And can not be mounted next time.

[  762.387457] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[  762.395622] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[  762.403915] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[  762.412263] EXT4-fs error (device sda) in ext4_ext_truncate:4661:
Corrupt filesystem

[  762.420613] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[  762.428913] EXT4-fs error (device sda) in ext4_orphan_del:2896:
Corrupt filesystem

[  762.437262] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[  762.445614] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[  762.454516] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[  762.462283] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[  767.370571] jbd2_journal_bmap: journal block not found at offset 13 on sda-8

[  767.371458] Aborting journal on device sda-8.

[  767.395583] EXT4-fs error: 564 callbacks suppressed

[  767.396173] EXT4-fs error (device sda) in ext4_da_write_end:2841: IO failure

[  767.412221] EXT4-fs error (device sda):
ext4_journal_check_start:56: Detected aborted journal

[  767.413325] EXT4-fs (sda): Remounting filesystem read-only

dd: writing '/mnt/test.bin': Read-only file system


blockio:

# targetcli

/> cd backstores/iblock

/backstores/iblock> create name=block_backend dev=/dev/sda4

/backstores/iblock> cd /vhost

/vhost> create

/vhost> ls

o- vhost ............................................................ [1 Target]

 o- naa.60014053c5cc00ac .............................................. [1 TPG]

   o- tpg1 ............................................. [naa.6001405830beacfa]

     o- luns ......................................................... [0 LUNs]

/vhost> cd naa.60014053c5cc00ac/tpg1/luns

/vhost/naa.60...0ac/tpg1/luns> create /backstores/iblock/block_backend

/vhost/naa.60...0ac/tpg1/luns> cd /

/> saveconfig

qemu.git/aarch64-softmmu/qemu-system-aarch64 \

   -enable-kvm -nographic -kernel Image \

   -device vhost-scsi-pci,wwpn=naa.60014053c5cc00ac \

   -m 512 -M virt -cpu host \

   -append "earlyprintk console=ttyAMA0 mem=512M"


Mount /dev/sda /mnt

sync; date; dd if=/dev/zero of=/mnt/test bs=1M count=100; sync; date;


sync; date; sync; date; dd if=/dev/zero of=/mnt/test bs=1M count=100;

Thu Jan  1 00:01:16 UTC 1970

[   77.044879] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[   77.067334] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[   77.075623] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[   77.083970] EXT4-fs error (device sda) in ext4_ext_truncate:4661:
Corrupt filesystem

[   77.092322] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[   77.100619] EXT4-fs error (device sda) in ext4_orphan_del:2896:
Corrupt filesystem

[   77.108971] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[   77.117321] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[   77.126204] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem

[   77.133989] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5172: Corrupt filesystem


[   82.025630] jbd2_journal_bmap: journal block not found at offset 10 on sda-8

[   82.026522] Aborting journal on device sda-8.

[   82.050642] EXT4-fs error: 563 callbacks suppressed

[   82.051278] EXT4-fs error (device sda) in ext4_da_write_end:2841: IO failure

[   82.067283] EXT4-fs error (device sda):
ext4_journal_check_start:56: Detected aborted journal

[   82.068372] EXT4-fs (sda): Remounting filesystem read-only

dd: writing '/mnt/test': Read-only file system