c - Clarification need on calling a function in the kernel -

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i having issue calling function (ext3_get_inode_loc) exec.c exists in several other files.

i should mention new , entirely self-taught i'm sure have major knowledge gaps. appreciate pointers or advice on i'm missing, and/or answers.

below result of recursive grep linux-3.10.0.123.20.1.el7 directory - 

"grep ext3_get_inode_loc -r *"  fs/ext3/inode.c:  fs/ext3/inode.c:static int __ext3_get_inode_loc(struct inode *inode,   fs/ext3/inode.c:ext3_error (inode->i_sb, ext3_get_inode_loc",   fs/ext3/inode.c:ext3_error(inode->i_sb, ext3_get_inode_loc",   fs/ext3/inode.c:int ext3_get_inode_loc(struct inode *inode, struct ext3_iloc *iloc)   fs/ext3/inode.c:return __ext3_get_inode_loc(inode, iloc,   fs/ext3/inode.c:ret = __ext3_get_inode_loc(inode, &iloc, 0);   fs/ext3/inode.c:err = ext3_get_inode_loc(inode, iloc);   fs/ext3/inode.c:err = ext3_get_inode_loc(inode, &iloc);   fs/ext3/ext3.h:extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);   fs/ext3/xattr.c:error = ext3_get_inode_loc(inode, &iloc);   fs/ext3/xattr.c:error = ext3_get_inode_loc(inode, &iloc);   fs/ext3/xattr.c:error = ext3_get_inode_loc(inode, &is.iloc);

which shows exists in these 3 files -

ext3.h   inode.c   xattr.c

ext3.h includes function prototype 

extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);

inode.c , xattr.c both include ext3.h providing prototype both files 

#include "ext3.h"

inode.c includes function definition - 

static int __ext3_get_inode_loc(struct inode *inode, struct ext3_iloc *iloc, int in_mem) {     ext3_fsblk_t block;     struct buffer_head *bh;      block = ext3_get_inode_block(inode->i_sb, inode->i_ino, iloc);     if (!block)             return -eio;      bh = sb_getblk(inode->i_sb, block); . . ... , forth }

and function call - 

err = ext3_get_inode_loc(inode, iloc);

xattr.c includes call, not definition - 

error = ext3_get_inode_loc(inode, &iloc);

my question is, if add exact same line of code - 

error = ext3_get_inode_loc(inode, &iloc);

to open_exec() within exec.c in same manner of xattr.c (without function definition) following error when compiling "make" -

fs/built-in.o: in function `open_exec': ~/linux-3.10.0-123.20.1.el7/fs/exec.c:828: undefined reference `ext3_get_inode_loc'

why function available xattr.c , not exec.c? i've googled quite bit on , have read might due linking issue (or lack thereof) between exec.c , xattr.c

thanks ahead of time - rog

ext3_get_inode_loc local ext3 driver, located @ fs/ext3. cannot call outside of driver code.


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