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SubjectRe: [PATCH] comments on st_blksize and f_bsize for 2.5
On Tue, Feb 18, 2003 at 08:25:40PM +0300, Hans Reiser wrote:

> Since a few applications, and the linux manpages, seem to not really
> understand what these are for, they need comments like SUSv2 has for
> them. A larger discussion will be provided if requested.

> + unsigned int st_blksize; /* Optimal I/O size */

> + int f_bsize; /* Filesystem blocksize */

Yes, discussion - I wouldnt mind seeing details.

The trivial part is st_blksize: all agree.
Quoting the man page:

The value st_blksize gives the "preferred" blocksize
for efficient file system I/O. (Writing to a file in
smaller chunks may cause an inefficient read-modify-rewrite.)

The nontrivial part is f_bsize. As far as I can see
BSD and SYSV and SUS all differ. And there are the use
in struct statfs and the use in struct statvfs that are
nonequivalent.

Maybe BSD f_iosize, f_bsize in statfs corresponds to
SYSV f_bsize, f_frsize in statfs. Linux is again a
bit different.

Andries
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