what's relationship between VFS inode and ext3_inode?

[Zhang Shukun <bitzsk gmail com>]

hi,

in kernel space ,if i get the i_ino(inode mumber ) of a file, and next
how could i get the block number of this file? in VFS layer the inode
struct haven't i_block[] array to point to the blocks. but in
ext3_inode struct, it has. what's the relationship between the VFS
inode and ext3_inode?

how do i get the block number of a file ?  the path is as follow:

filp_open("/bin/ls",O_RDONLY,0)----

-->struct file *------->struct dentry  *f_dentry----->struct inode *d_inode-------->struct inode{}------------->???------------>struct ext3_inode{}---------->__le32    i_block[EXT2_N_BLOCKS];

from VFS inode to ext3_inode , i don't know how to transfer?? Thanks!

-- 
Best regards,
张树坤
北京理工大学，计算机科学技术学院
Sucan
Computer Department,Beijing Institute of Technology,China