I wrote a filter driver over block device.

Question

HI,
I wrote a virutal volume driver over block device , simlar with LVM,
I call it "vraid" ,I can create PV,VG,LV,it's working well.
However I cannot acess the sector over 2G , I can use the system
command "newfs -s XXXX /dev/vlun/rdsk/vlun0" to create a 2G filesystem.
If I use newfs /dev/vlun/rdsk/vlun0 to create the file system in the whole LV size,I found
If LV>2G ,the sector beyond 2G will not be located correctly. output as below.
seek\:XXXXXX Invalid argument.
So I use the system c ommand "truss" to trace the command mkfs (newfs invoke mkfs finally) ,
I found the llseek() is the matter,
When llseek() is invoked, I trace d all system callings,I found if I use llseek() to
locate some sectors, however there is no any callings ocurred in my drvier besides the
calling open() and close()/
I wonder to know why I always failed to acess the sector over 2G .
thanks and happies.
I'm sorry my poor English/
I'm in China. and I'm a Chinese girl.
Ms. Anda

Answer 1

My makefile is the following.:
# CC = /opt/SUNWspro/bin/cc
CC = /usr/local/bin/gcc
LD = /usr/ucb/bin/ld
# 'uname -p' command
INST = i386
INCL = -I . -I $(TOPDIR)/include
#gcc
CFLAGS = -O $(INCL) -D_KERNEL -DOS_SOLARIS -Wall
TOPDIR = ../..
BUILD = vraid
OBJS = _vraid.o        \
raid0.o \
raid1.o \
multicopy.o \
snapshot.o \
queue.o \
hash.o \
rand.o
$(BUILD) vraid_driver_setup.bin:$(OBJS)
$(LD) -r -o $(BUILD) $(OBJS)
sh -c ./generate_bin_install.sh
hash.o:hash.c
$(CC) $(CFLAGS) -o hash.o -c hash.c
_vraid.o:vraid.c
$(CC) $(CFLAGS) -o _vraid.o -c vraid.c
raid0.o:raid0.c
$(CC) $(CFLAGS) -o raid0.o -c raid0.c
raid1.o:raid1.c
multicopy.o:multicopy.c
$(CC) $(CFLAGS) -o multicopy.o -c multicopy.c
queue.o:queue.c
$(CC) $(CFLAGS) -o queue.o -c queue.c
snapshot.o:snapshot.c
$(CC) $(CFLAGS) -o snapshot.o -c snapshot.c
rand.o:rand.c
$(CC) $(CFLAGS) -o rand.o -c rand.c
clean:
rm -rf $(OBJS) $(BUILD) vraid_driver_setup.bin