Downloading large mp3 files using bittorrent causes beagled-helper to get stuck using lots of CPU time.

I'm using Azureus.  It pre-allocates the mp3 file with lots of zero bytes, which seems to cause trouble for beagled-helper.

To reproduce the problem, run this command somewhere that beagle indexes:

  dd if=/dev/zero of=zero.mp3 bs=1000 count=10000

This makes a 96M file full of zeros.

Running strace on beagled-helper shows that it's doing the following:

_llseek(31, 39540358, [39540358], SEEK_SET) = 0
read(31, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192) = 8192
fstat64(31, {st_mode=S_IFREG|0644, st_size=100000000, ...}) = 0
_llseek(31, 39540359, [39540359], SEEK_SET) = 0
read(31, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192) = 8192
fstat64(31, {st_mode=S_IFREG|0644, st_size=100000000, ...}) = 0
_llseek(31, 39540360, [39540360], SEEK_SET) = 0
read(31, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192) = 8192
fstat64(31, {st_mode=S_IFREG|0644, st_size=100000000, ...}) = 0
_llseek(31, 39540361, [39540361], SEEK_SET) = 0
read(31, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192) = 8192
fstat64(31, {st_mode=S_IFREG|0644, st_size=100000000, ...}) = 0
_llseek(31, 39540362, [39540362], SEEK_SET) = 0
read(31, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 8192) = 8192
fstat64(31, {st_mode=S_IFREG|0644, st_size=100000000, ...}) = 0

notice that the llseek offset is increased by one each time.  I guess it's trying to find the ID3 header at every location within the file, and using a lot of CPU time in the process.