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what's relationship between VFS inode and ext3_inode?



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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