Ilan,
On Mon, Mar 20, 2017 at 10:33 AM, Ilan Schwarts <ila...@gmail.com> wrote:
> I need to cast struct inode to struct btrfs_inode.
> in order to do it, i looked at implementation of btrfs_getattr.
>
> the code is simple:
> struct btrfs_inode *btrfsInode;
> btrfsInode = BTRFS_I(inode);
>
> in order to compile i must add the headers on top of the function:
> #include "/data/kernel/linux-4.1.21-x86_64/fs/btrfs/ctree.h"
> #include "/data/kernel/linux-4.1.21-x86_64/fs/btrfs/btrfs_inode.h"
>
> What is the problem ?
> I must manually download and include ctree.h and btrfs_inode.h, they
> are not provided in the kernel-headers package.
> On every platform I compile my driver, I have specific VM for the
> distro/kernel version, so on every VM I usually download package
> kernel-headers and everything compiles perfectly.
>
> btrfs was introduced in kernel 3.0 above.
> Arent the btrfs headers should be there ? do they exist in another
> package ? maybe fs-headers or something like that ?
Try using the below simple Makefile[1] to compile btrfs loadable
module. You need to have the kernel-headers package installed.
You can place the makefile anywhere you want, and compile via:
# make -f <path to makefile>
Thanks,
Alex.
[1]
obj-m += btrfs.o
# or substitute with hard-coded kernel version
KVERSION = $(shell uname -r)
SRC_DIR=<path to your kernel source>/fs/btrfs
BTRFS_KO=btrfs.ko
# or specify any other output directory
OUT_DIR=/lib/modules/$(KVERSION)/kernel/fs/btrfs
all: $(OUT_DIR)/$(BTRFS_KO)
$(OUT_DIR)/$(BTRFS_KO): $(SRC_DIR)/$(BTRFS_KO)
cp $(SRC_DIR)/$(BTRFS_KO) $(OUT_DIR)/
$(SRC_DIR)/$(BTRFS_KO): $(SRC_DIR)/*.c $(SRC_DIR)/*.h
$(MAKE) -C /lib/modules/$(KVERSION)/build M=$(SRC_DIR) modules
clean:
$(MAKE) -C /lib/modules/$(KVERSION)/build M=$(SRC_DIR) clean
test -f $(OUT_DIR)/$(BTRFS_KO) && rm $(OUT_DIR)/$(BTRFS_KO) || true
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