DragonFlyBSD

Hi,

I'm seeing a weird problem with statvfs() on a hammer filesystems.
With this little test program:

#include <inttypes.h>
#include <stdio.h>
#include <sys/statvfs.h>

int main(int argc, char **argv) {
struct statvfs fsbuf;

if (statvfs(argv[1], &fsbuf) < 0)
        err(1, "Can't statvfs() `%s'", argv[1]);

fprintf(stderr, "statvfs %s, bavail %lld, frsize %lld\n",
        argv[1], fsbuf.f_bavail, fsbuf.f_frsize);
}

I get fsbuf.f_bavail == 0 on a freshly mounted hammer FS:

vkernel-leaf# dd if=/dev/zero of=hammer.img bs=1024 count=194000
vkernel-leaf# vnconfig vn0 hammer.img
vkernel-leaf# newfs_hammer -L foo -f /dev/vn0
vkernel-leaf# mount_hammer /dev/vn0 /mnt/
vkernel-leaf# ./statvfs /mnt/
statvfs /mnt/, bavail 0, frsize 16384

After doing df -k, things are back to normal:

vkernel-leaf# df -k
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/vkd0s0a 516054 503790 -29020 106% /
devfs 1 1 0 100% /dev
foo 65536 210016 -144480 320% /mnt
vkernel-leaf# ./statvfs /mnt/
statvfs /mnt/, bavail -9030, frsize 16384

I added some kprintf()s:

diff --git a/sys/vfs/hammer/hammer_vfsops.c b/sys/vfs/hammer/hammer_vfsops.c
index 0b6139e..f94bfed 100644
--- a/sys/vfs/hammer/hammer_vfsops.c
+++ b/sys/vfs/hammer/hammer_vfsops.c
@ -921,10 +921,17 @ hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
hammer_rel_volume(volume, 0);

mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;

+kprintf("hammer_vfs_statvfs: mp->mnt_vstat.f_bfree %lld\n", mp->mnt_vstat.f_bfree);

     mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree;

+kprintf("hammer_vfs_statvfs: mp->mnt_vstat.f_bavail %lld\n", mp->mnt_vstat.f_bavail);

     if (mp->mnt_vstat.f_files < 0)
         mp->mnt_vstat.f_files = 0;
     *sbp = mp->mnt_vstat;
+
     return(0);
 }

With those I get:

hammer_vfs_statvfs: mp->mnt_vstat.f_bfree 9721495
hammer_vfs_statvfs: mp->mnt_vstat.f_bavail 0

What am I missing?

Cheers,
Johannes

PS: The original problem is that pkgin is reporting not enough space to
install packages.