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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/features
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/features')
-rw-r--r--xlators/features/marker/src/marker.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/xlators/features/marker/src/marker.c b/xlators/features/marker/src/marker.c
index 2dc03f93..112e71df 100644
--- a/xlators/features/marker/src/marker.c
+++ b/xlators/features/marker/src/marker.c
@@ -1876,6 +1876,75 @@ err:
return 0;
}
+
+int32_t
+marker_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+ struct iatt *postbuf, dict_t *xdata)
+{
+ marker_local_t *local = NULL;
+ marker_conf_t *priv = NULL;
+
+ if (op_ret == -1) {
+ gf_log (this->name, GF_LOG_TRACE, "%s occurred during discard",
+ strerror (op_errno));
+ }
+
+ local = (marker_local_t *) frame->local;
+
+ frame->local = NULL;
+
+ STACK_UNWIND_STRICT (discard, frame, op_ret, op_errno, prebuf,
+ postbuf, xdata);
+
+ if (op_ret == -1 || local == NULL)
+ goto out;
+
+ priv = this->private;
+
+ if (priv->feature_enabled & GF_QUOTA)
+ mq_initiate_quota_txn (this, &local->loc);
+
+ if (priv->feature_enabled & GF_XTIME)
+ marker_xtime_update_marks (this, local);
+out:
+ marker_local_unref (local);
+
+ return 0;
+}
+
+int32_t
+marker_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+ size_t len, dict_t *xdata)
+{
+ int32_t ret = 0;
+ marker_local_t *local = NULL;
+ marker_conf_t *priv = NULL;
+
+ priv = this->private;
+
+ if (priv->feature_enabled == 0)
+ goto wind;
+
+ local = mem_get0 (this->local_pool);
+
+ MARKER_INIT_LOCAL (frame, local);
+
+ ret = marker_inode_loc_fill (fd->inode, &local->loc);
+
+ if (ret == -1)
+ goto err;
+wind:
+ STACK_WIND (frame, marker_discard_cbk, FIRST_CHILD(this),
+ FIRST_CHILD(this)->fops->discard, fd, offset, len, xdata);
+ return 0;
+err:
+ STACK_UNWIND_STRICT (discard, frame, -1, ENOMEM, NULL, NULL, NULL);
+
+ return 0;
+}
+
+
/* when a call from the special client is received on
* key trusted.glusterfs.volume-mark with value "RESET"
* or if the value is 0length, update the change the
@@ -2686,6 +2755,7 @@ struct xlator_fops fops = {
.getxattr = marker_getxattr,
.readdirp = marker_readdirp,
.fallocate = marker_fallocate,
+ .discard = marker_discard,
};
struct xlator_cbks cbks = {