what's relationship between VFS inode and ext3_inode?

[Zhang Shukun]

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
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