Wrong/Incomplete Data Read from Disk
|Reported by:||bonefish||Owned by:||axeld|
VMWare, 1 CPU, 256 MB RAM, 100 MB Haiku image (hrev20309) as IDE 0:0, 100 MB ReiserFS image as IDE 0:1, CD ROM IDE 1:0,...
When trying to mount the ReiserFS volume (through UserlandFS) readv_pos()/read_pos() retrieve incorrect data from the device for one of the blocks. I've traced the read requests to scsi_dsk:das_read() where they look OK. I dumped the read block in block_io:block_io_read() (io.c) showing the beginning reflect the actual data stored on disk, but the remainder is zero'd out. Of the two attempts to read the block in question the second one returned more of the correct data. An md5sum over the device returned the correct checksum, though.
Attached is the part of the serial debug output showing the dumped block. The second attachment shows a dump of the block how it should look like.
For testing ReiserFS via UserlandFS add the following to you UserBuildConfig:
# UserlandFS kernel add-on, server, and BeOS FS interface lib AddFilesToHaikuImage beos system add-ons kernel file_systems : userlandfs ; AddFilesToHaikuImage beos system servers : UserlandFSServer ; AddFilesToHaikuImage beos system lib : libuserlandfs_beos_kernel.so ; # settings file local ufsSettings = <userlandfs!settings>userlandfs ; SEARCH on $(ufsSettings) = [ FDirName $(HAIKU_TOP) src add-ons kernel file_systems userlandfs ] ; AddFilesToHaikuImage home config settings kernel drivers : $(ufsSettings) ; # ReiserFS AddFilesToHaikuImage home config add-ons userlandfs : <userland>reiserfs ;
When Haiku has booted start the UserlandFSServer in one Terminal:
and mount the volume in another one:
mkdir /mnt mount -t userlandfs -p reiserfs /dev/disk/ata/0/slave/raw /mnt
I've uploaded my ReiserFS test image to: