在omfs_create处下断点：
Breakpoint 3, omfs_create (dir=0xdde13c20, dentry=0xdf6f6440, mode=33188,
nd=0xddbe1eb8) at fs/omfs/dir.c:304
函数调用堆栈如下：
#0 omfs_create (dir=0xdde13c20, dentry=0xdf6f6440, mode=33188, nd=0xddbe1eb8)
at fs/omfs/dir.c:304
#1 0xc029e952 in vfs_create (dir=0xdde13c20, dentry=0xdf6f6440, mode=33188,
nd=0xddbe1eb8) at fs/namei.c:1418
#2 0xc029ebe5 in __open_namei_create (nd=0xddbe1eb8, path=0xddbe1f18,
open_flag=35137, mode=420) at fs/namei.c:1513
#3 0xc029f119 in do_last (nd=0xddbe1eb8, path=0xddbe1f18, open_flag=35137,
acc_mode=34, mode=438, pathname=0xd784f000 "aaaa") at fs/namei.c:1696
#4 0xc029f513 in do_filp_open (dfd=-100, pathname=0xd784f000 "aaaa",
open_flag=35137, mode=438, acc_mode=34) at fs/namei.c:1835
#5 0xc028f239 in do_sys_open (dfd=-100, filename=0xbfe8392a "aaaa",
flags=35137, mode=438) at fs/open.c:1052
#6 0xc028f2a7 in sys_open (filename=0xbfe8392a "aaaa", flags=35137, mode=438)
at fs/open.c:1073
#7 0xc0104657 in ?? () at arch/x86/kernel/entry_32.S:457
Omfs_createàomfs_add_node(dir, dentry, mode | S_IFREG);
区别如下：
在omfs_new_inode中：
switch (mode & S_IFMT) {
case S_IFDIR:
inode->i_op = &omfs_dir_inops;
inode->i_fop = &omfs_dir_operations;
inode->i_size = sbi->s_sys_blocksize;
inc_nlink(inode);
break;
case S_IFREG:
inode->i_op = &omfs_file_inops;
inode->i_fop = &omfs_file_operations;
inode->i_size = 0;
break;
}
在omfs_make_empty中：
if (inode->i_mode & S_IFDIR) {
memset(&bh->b_data[OMFS_DIR_START], 0xff,
sbi->s_sys_blocksize - OMFS_DIR_START);
} else
omfs_make_empty_table(bh, OMFS_EXTENT_START);
#define OMFS_EXTENT_START 0x1d0
对于文件的inode，我们会在inode中写入omfs_extent信息：
oe->e_next = ~cpu_to_be64(0ULL);
oe->e_extent_count = cpu_to_be32(1),
oe->e_fill = cpu_to_be32(0x22),
oe->e_entry.e_cluster = ~cpu_to_be64(0ULL);
oe->e_entry.e_blocks = ~cpu_to_be64(0ULL);