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authorBrian Foster <bfoster@redhat.com>2013-05-23 12:19:42 -0400
committerAnand Avati <avati@redhat.com>2013-06-13 14:37:43 -0700
commit17f287172413dc04244781aa5302a0e4f10e2777 (patch)
tree2acfc7097c92de32b19e82140befd8dc9fb2dad2 /xlators/performance/io-threads
parentd1ccc4e400728d90f2ef7904661f53deb7199123 (diff)
glusterfs: discard (hole punch) support
Add support for the DISCARD file operation. Discard punches a hole in a file in the provided range. Block de-allocation is implemented via fallocate() (as requested via fuse and passed on to the brick fs) but a separate fop is created within gluster to emphasize the fact that discard changes file data (the discarded region is replaced with zeroes) and must invalidate caches where appropriate. BUG: 963678 Change-Id: I34633a0bfff2187afeab4292a15f3cc9adf261af Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-on: http://review.gluster.org/5090 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
Diffstat (limited to 'xlators/performance/io-threads')
-rw-r--r--xlators/performance/io-threads/src/io-threads.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/xlators/performance/io-threads/src/io-threads.c b/xlators/performance/io-threads/src/io-threads.c
index 33642bffb25..c6bdc375439 100644
--- a/xlators/performance/io-threads/src/io-threads.c
+++ b/xlators/performance/io-threads/src/io-threads.c
@@ -308,6 +308,7 @@ iot_schedule (call_frame_t *frame, xlator_t *this, call_stub_t *stub)
case GF_FOP_FXATTROP:
case GF_FOP_RCHECKSUM:
case GF_FOP_FALLOCATE:
+ case GF_FOP_DISCARD:
pri = IOT_PRI_LO;
break;
@@ -2459,6 +2460,56 @@ out:
}
int
+iot_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ struct iatt *preop, struct iatt *postop, dict_t *xdata)
+{
+ STACK_UNWIND_STRICT (discard, frame, op_ret, op_errno, preop, postop,
+ xdata);
+ return 0;
+}
+
+
+int
+iot_discard_wrapper(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+ size_t len, dict_t *xdata)
+{
+ STACK_WIND (frame, iot_discard_cbk, FIRST_CHILD (this),
+ FIRST_CHILD (this)->fops->discard, fd, offset, len, xdata);
+ return 0;
+}
+
+
+int
+iot_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+ size_t len, dict_t *xdata)
+{
+ call_stub_t *stub = NULL;
+ int ret = -1;
+
+ stub = fop_discard_stub(frame, iot_discard_wrapper, fd, offset, len,
+ xdata);
+ if (!stub) {
+ gf_log (this->name, GF_LOG_ERROR, "cannot create discard stub"
+ "(out of memory)");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = iot_schedule (frame, this, stub);
+
+out:
+ if (ret < 0) {
+ STACK_UNWIND_STRICT (discard, frame, -1, -ret, NULL, NULL,
+ NULL);
+ if (stub != NULL) {
+ call_stub_destroy (stub);
+ }
+ }
+ return 0;
+}
+
+int
__iot_workers_scale (iot_conf_t *conf)
{
int scale = 0;
@@ -2788,6 +2839,7 @@ struct xlator_fops fops = {
.fxattrop = iot_fxattrop,
.rchecksum = iot_rchecksum,
.fallocate = iot_fallocate,
+ .discard = iot_discard,
};
struct xlator_cbks cbks;