diff options
| author | Paul Clements | 2012-10-05 02:16:18 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2012-10-05 20:05:24 +0200 |
| commit | a336d29870f8a1f8e5f10d9f1aa95531c4edeabe (patch) | |
| tree | 9957b7a2dbdc5047fe1f2be7907f90f5bdb6fbf0 /drivers/block/aoe/aoenet.c | |
| parent | nbd: add set flags ioctl (diff) | |
| download | kernel-qcow2-linux-a336d29870f8a1f8e5f10d9f1aa95531c4edeabe.tar.gz kernel-qcow2-linux-a336d29870f8a1f8e5f10d9f1aa95531c4edeabe.tar.xz kernel-qcow2-linux-a336d29870f8a1f8e5f10d9f1aa95531c4edeabe.zip | |
nbd: handle discard requests
Add discard support to nbd. If the nbd-server supports discard, it will
send NBD_FLAG_SEND_TRIM to the client. The client will then set the flag
in the kernel via NBD_SET_FLAGS, which tells the kernel to enable discards
for the device (QUEUE_FLAG_DISCARD).
If discard support is enabled, then when the nbd client system receives a
discard request, this will be passed along to the nbd-server. When the
discard request is received by the nbd-server, it will perform:
fallocate(.. FALLOC_FL_PUNCH_HOLE ..)
To punch a hole in the backend storage, which is no longer needed.
Signed-off-by: Paul Clements <paul.clements@steeleye.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block/aoe/aoenet.c')
0 files changed, 0 insertions, 0 deletions