On Thu, Feb 4, 2016 at 9:21 PM, Dave Chinner <david@xxxxxxxxxxxxx> wrote: > On Thu, Feb 04, 2016 at 12:11:28AM +0000, fdmanana@xxxxxxxxxx wrote: >> From: Filipe Manana <fdmanana@xxxxxxxx> >> >> Test that an incremental send operation which issues clone operations >> works for files that have a full path containing more than one parent >> directory component. >> >> This used to fail before the following patch for the linux kernel: >> >> "[PATCH] Btrfs: send, fix extent buffer tree lock assertion failure" >> >> Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx> > > Looks ok, I've pulled it in. Something to think about: > >> +# Create a bunch of small and empty files, this is just to make sure our >> +# subvolume's btree gets more than 1 leaf, a condition necessary to trigger a >> +# past bug (1000 files is enough even for a leaf/node size of 64K, the largest >> +# possible size). >> +for ((i = 1; i <= 1000; i++)); do >> + echo -n > $SCRATCH_MNT/a/b/c/z_$i >> +done > > We already do have a generic function for doing this called > _populate_fs(), it's just not optimised for speed with large numbers > of files being created. > > i.e. The above is simple a single directory tree with a single level > with 1000 files of size 0: > > _populate_fs() -d 1 -n 1 -f 1000 -s 0 -r $SCRATCH_MNT/a/b/ > > Can you look into optimising _populate_fs() to use multiple threads > (say up to 4 by default) and "echo -n" to create files, and then > convert all our open coded "create lots of files" loops in tests to > use it? Sure, I'll take a look at it when I get some spare time. Thanks Dave. > > Cheers, > > Dave. > -- > Dave Chinner > david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe fstests" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
