On 25.04.2012 21:12, Vladimir 'φ-coder/phcoder' Serbinenko wrote: > Hello, with the attached script grub-fstest fails completely with > blocksize=1024 and partially with 2048. Do you have any idea why? I > tried to debug and my finding is that grub_nilfs2_read_checkpoint reads > garbage. pptr makes sense but it points inside a file instead of to the > metadata. If I load the other superblock I'm able to read empty disk > (what's there before script starts putting files). Easier way to reproduce and log: ~/compile/nilfs$ qemu-img create 1.img 500M Formatting '1.img', fmt=raw size=524288000 ~/compile/nilfs$ mkfs.nilfs2 -b 1024 1.img mkfs.nilfs2 (nilfs-utils 2.1.0) Start writing file system initial data to the device Blocksize:1024 Device:1.img Device Size:524288000 File system initialization succeeded !! ~/compile/nilfs$ sudo mount 1.img /mnt/1/ -o loop mount.nilfs2: cannot modify /etc/mtab. Please remount the partition with -f option after making /etc/mtab writable. nilfs_cleanerd not started ~/compile/nilfs$ ./grub-fstest ./1.img ls -- -l Device loop0: Filesystem type nilfs2 - UUID 88cf7708-5700-481c-8039-d05d3fedab13 - Total size 1024000 sectors Device host: Filesystem type hostfs - Total size 0 sectors
~/compile/nilfs$ sudo dd if=/dev/zero of=/mnt/1/x2 bs=1M count=30 30+0 records in 30+0 records out 31457280 bytes (31 MB) copied, 0.292755 s, 107 MB/s ~/compile/nilfs$ sync ~/compile/nilfs$ ./grub-fstest ./1.img ls -- -l / 31457280 x2 ~/compile/nilfs$ sudo dd if=/dev/zero of=/mnt/1/x1 bs=1M count=30 30+0 records in 30+0 records out 31457280 bytes (31 MB) copied, 0.324172 s, 97.0 MB/s ~/compile/nilfs$ sync ~/compile/nilfs$ ./grub-fstest ./1.img ls -- -l / ~/compile/nilfs$ ./grub-fstest ./1.img ls -- -l Device loop0: Filesystem type nilfs2 - UUID 88cf7708-5700-481c-8039-d05d3fedab13 - Total size 1024000 sectors Device host: Filesystem type hostfs - Total size 0 sectors (it reads all-zeros from file as checkpoint descriptor) -- Regards Vladimir 'φ-coder/phcoder' Serbinenko
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