Oh hai
Sorry if it's already fixed, but at least in fedora's
2.6.32.3-10.fc12.i686.PAE btrfs has a regression which can be
illustrated by running the following dumb test:
=== cut here ===
#define _GNU_SOURCE
#define _FILE_OFFSET_BITS 64
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main() {
int fd = open("testfile", O_CLOEXEC | O_CREAT | O_NOATIME | O_WRONLY, 0666);
fallocate(fd, 0, 0, 100);
write(fd, "test", 4);
close(fd);
}
=== cut here ===
if you run it on ext4, it will create a 4-byte file with "test" in it.
On btrfs, however, the file size would be 4096, and the remaining
space will be filled with zeroes.
I will try more recent kernels with that though.
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