Hi,
the blocks size is computed according to statvfs structure description
(see 'man statvfs'):
--8<--
struct statvfs {
unsigned long f_bsize; /* file system block size */
unsigned long f_frsize; /* fragment size */
fsblkcnt_t f_blocks; /* size of fs in f_frsize units */
fsblkcnt_t f_bfree; /* # free blocks */
fsblkcnt_t f_bavail; /* # free blocks for non-root */
fsfilcnt_t f_files; /* # inodes */
fsfilcnt_t f_ffree; /* # free inodes */
fsfilcnt_t f_favail; /* # free inodes for non-root */
unsigned long f_fsid; /* file system ID */
unsigned long f_flag; /* mount flags */
unsigned long f_namemax; /* maximum filename length */
};
--8<--
f_blocks has to be recomputed this way since it describes the number of
fragments, not blocks (the f_bsize and f_frsize match on all linuxes
which i ever saw even with different block sizes).
Martin
Aaron Scamehorn wrote:
Hello,
In device_usage_sysdep:
I'm not quite sure what the following is supposed to be calculating:
inf->f_blocks= usage.f_blocks * usage.f_frsize / usage.f_bsize;
I think you're incorrectly mixing block size & fragment sizes. I don't
think they have anything to do with each other.
You're probably just getting lucky, because your f_frsize & f_bsize both
= 4K.
However, on large filesystems, where f_bsize might be 32K, you'll get
crazy usage numbers.
I think you just want:
inf->f_blocks= usage.f_blocks ;
Thanks,
Aaron
25 if(statvfs( dir, &usage) != 0) {
(gdb) n
(gdb) print usage
$1 = {f_bsize = 32768, f_frsize = 4096, f_blocks = 8811322, f_bfree =
8053030, f_bavail = 7605440,
f_files = 35815424, f_ffree = 35800806, f_favail = 35800806, f_fsid =
0, __f_unused = 0, f_flag = 0,
f_namemax = 255, __f_spare = {0, 0, 0, 0, 0, 0}}
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