tree 8044870624bd8bc18a6ac26a3abef8f7064a0343
parent e90a59ed434d6c5e38dd148aa4ba5b22b8f7eb24
author Lukas Czerner <lczerner@redhat.com> 1290051517 +0000
committer Theodore Ts'o <tytso@mit.edu> 1290476506 -0500

e2fsprogs: Add CHANNEL_FLAGS_DISCARD_ZEROES flag for io_manager

When the device have discard support and simultaneously discard zeroes
data (and it is properly advertised), then we can take advantage of such
behavior in several e2fsprogs tools.

Add new flag CHANNEL_FLAGS_DISCARD_ZEROES for struct_io_channel so
each io_manager can take advantage of this. The flag is properly set
according to BLKDISCARDZEROES ioctl in unix_open.

Also remove old mke2fs_discard_zeroes_data() function and substitute it
with helper which test this flag.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>