Theodore Ts'o wrote: > Hey Eric, > > Can you or Ric put in a good word with Ulrich (through appropriate Red > Hat channels, if that would be helpful) for this glibc enhancement request: > > http://sources.redhat.com/bugzilla/show_bug.cgi?id=7083 > > Given that glibc 2.9 was just released, presumably this won't show up > until glibc 2.10, and it'll probably be a *long* time before it this > will show up in real distributions, but it would be good to get this > into functionality into glibc ASAP. Hm... I thought it was already there. posix_fallocate() is indeed calling sys_fallocate; doing a very simple test: fd = open("testfile", O_RDWR|O_CREAT); error = posix_fallocate(fd, 0, 16384); and then asking xfs about the allocation (sorry for the xfs, but xfs_bmap is still so handy for this...): # xfs_bmap -vv testfile testfile: EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL FLAGS 0: [0..31]: 34984576..34984607 2 (1256112..1256143) 32 10000 FLAG Values: 010000 Unwritten preallocated extent it looks like it's doing the Right Thing. This is on: # rpm -q glibc glibc-2.9-2.x86_64 ... oh, ok, but plain old fallocate() isn't yet hooked up, odd. # gcc -o test-fallocate test-fallocate.c /tmp/ccQTk6an.o: In function `main': test-fallocate.c:(.text+0x3e): undefined reference to `fallocate' Especially odd because we have a man page shipping, but no actual implemented interface :) OK, I'll go bug people. -Eric -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
