Re: [PATCH] direct IO breaks root filesystem

From: Linus Torvalds (
Date: Tue Dec 11 2001 - 12:26:09 EST

On Tue, 11 Dec 2001, GOTO Masanori wrote:
> I, however, found another problem.
> Accessing with inode size unit (== 4096 byte) is ok, but if I accessed
> with block size unit, generic_direct_IO() returns error. The reason
> is that blocksize is designated as inode->i_blkbits, and its value is
> not disk minimal block size (512), but inode's unit size (4096).

That is not a bug, but a feature.

We _always_ have to do the IO in "inode size" chunks, and if you want to
change it, you have to change it at a higher level (ie you should set the
blocksize with the "BLKBSZSET" ioctl.)


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This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:20 EST