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authorLukas Czerner <lczerner@redhat.com>2010-10-28 01:30:12 (GMT)
committerTheodore Ts'o <tytso@mit.edu>2010-10-28 01:30:12 (GMT)
commit7360d1731e5dc78aec867e65e55f9fb58782b5fe (patch)
tree2cc0d139ec129c19150ef481d6adb9b0fd947c89 /include
parent367a51a339020ba4d9edb0ce0f21d65bd50b00c9 (diff)
downloadlinux-7360d1731e5dc78aec867e65e55f9fb58782b5fe.tar.xz
ext4: Add batched discard support for ext4
Walk through allocation groups and trim all free extents. It can be invoked through FITRIM ioctl on the file system. The main idea is to provide a way to trim the whole file system if needed, since some SSD's may suffer from performance loss after the whole device was filled (it does not mean that fs is full!). It search for free extents in allocation groups specified by Byte range start -> start+len. When the free extent is within this range, blocks are marked as used and then trimmed. Afterwards these blocks are marked as free in per-group bitmap. Since fstrim is a long operation it is good to have an ability to interrupt it by a signal. This was added by Dmitry Monakhov. Thanks Dimitry. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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