Hi all,
I plan to use O_DIRECT in my application (on a partition, no fs).
It is hard to find info on the exact requirements on the mandatory
alignments of buffer, offset, transfer size: it's easy to find many
contradicting documents. And checking the kernel source itself isn't
trivial.
lseek(int fildes, off_t offset, int whence);
read(int fd, void *buf, size_t count);
My current assumption is this:
- offset must be block_aligned (multiple of 512)
- buf must be page_aligned (4096 on IA32)
- count must be "block_aligned" (multiple of 512)
Is this correct ?
r.
sysinfo:
--------
- Linux 2.4 (recent versions)
- using raw partion, no files, no fs
- IA32
-
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This archive was generated by hypermail 2b29 : Tue Apr 15 2003 - 22:00:18 EST