read() from VFS to ext2 file system

[Anandanam Rama Kotaiah <kotaiah@xxxxxxxxxxxxx>]

hi all
 In the system calls such as read,write.. the file system beneath only
deals with the block number.. but how does the kernel map a position
inside the file into a block number when the file is accessed..where
does the code exist in which a file system specific request is made..

bye
a Linux lover

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