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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/protocol/server/src/server-rpc-fops.c
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/protocol/server/src/server-rpc-fops.c')
-rw-r--r--xlators/protocol/server/src/server-rpc-fops.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/xlators/protocol/server/src/server-rpc-fops.c b/xlators/protocol/server/src/server-rpc-fops.c
index 4b847ea..55e30fd 100644
--- a/xlators/protocol/server/src/server-rpc-fops.c
+++ b/xlators/protocol/server/src/server-rpc-fops.c
@@ -2008,6 +2008,45 @@ out:
return 0;
}
+int
+server_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ struct iatt *statpre, struct iatt *statpost, dict_t *xdata)
+{
+ gfs3_discard_rsp rsp = {0,};
+ server_state_t *state = NULL;
+ rpcsvc_request_t *req = NULL;
+
+ req = frame->local;
+ state = CALL_STATE (frame);
+
+ GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+ rsp.xdata.xdata_len, op_errno, out);
+
+ if (op_ret) {
+ gf_log (this->name, GF_LOG_INFO,
+ "%"PRId64": DISCARD %"PRId64" (%s) ==> (%s)",
+ frame->root->unique, state->resolve.fd_no,
+ uuid_utoa (state->resolve.gfid),
+ strerror (op_errno));
+ goto out;
+ }
+
+ gf_stat_from_iatt (&rsp.statpre, statpre);
+ gf_stat_from_iatt (&rsp.statpost, statpost);
+
+out:
+ rsp.op_ret = op_ret;
+ rsp.op_errno = gf_errno_to_error (op_errno);
+
+ server_submit_reply(frame, req, &rsp, NULL, 0, NULL,
+ (xdrproc_t) xdr_gfs3_discard_rsp);
+
+ GF_FREE (rsp.xdata.xdata_val);
+
+ return 0;
+}
+
/* Resume function section */
int
@@ -2975,6 +3014,26 @@ err:
return 0;
}
+int
+server_discard_resume (call_frame_t *frame, xlator_t *bound_xl)
+{
+ server_state_t *state = NULL;
+
+ state = CALL_STATE (frame);
+
+ if (state->resolve.op_ret != 0)
+ goto err;
+
+ STACK_WIND (frame, server_discard_cbk,
+ bound_xl, bound_xl->fops->discard,
+ state->fd, state->offset, state->size, state->xdata);
+ return 0;
+err:
+ server_discard_cbk(frame, NULL, frame->this, state->resolve.op_ret,
+ state->resolve.op_errno, NULL, NULL, NULL);
+
+ return 0;
+}
/* Fop section */
@@ -3213,6 +3272,68 @@ out:
return ret;
}
+
+
+int
+server3_3_discard(rpcsvc_request_t *req)
+{
+ server_state_t *state = NULL;
+ call_frame_t *frame = NULL;
+ gfs3_discard_req args = {{0},};
+ int ret = -1;
+ int op_errno = 0;
+
+ if (!req)
+ return ret;
+
+ ret = xdr_to_generic (req->msg[0], &args,
+ (xdrproc_t)xdr_gfs3_discard_req);
+ if (ret < 0) {
+ //failed to decode msg;
+ req->rpc_err = GARBAGE_ARGS;
+ goto out;
+ }
+
+ frame = get_frame_from_request (req);
+ if (!frame) {
+ // something wrong, mostly insufficient memory
+ req->rpc_err = GARBAGE_ARGS; /* TODO */
+ goto out;
+ }
+ frame->root->op = GF_FOP_DISCARD;
+
+ state = CALL_STATE (frame);
+ if (!state->conn->bound_xl) {
+ /* auth failure, request on subvolume without setvolume */
+ req->rpc_err = GARBAGE_ARGS;
+ goto out;
+ }
+
+ state->resolve.type = RESOLVE_MUST;
+ state->resolve.fd_no = args.fd;
+
+ state->offset = args.offset;
+ state->size = args.size;
+ memcpy(state->resolve.gfid, args.gfid, 16);
+
+ GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
+ (args.xdata.xdata_val),
+ (args.xdata.xdata_len), ret,
+ op_errno, out);
+
+ ret = 0;
+ resolve_and_resume (frame, server_discard_resume);
+
+out:
+ free (args.xdata.xdata_val);
+
+ if (op_errno)
+ req->rpc_err = GARBAGE_ARGS;
+
+ return ret;
+}
+
+
int
server3_3_readlink (rpcsvc_request_t *req)
{
@@ -5867,6 +5988,7 @@ rpcsvc_actor_t glusterfs3_3_fop_actors[] = {
[GFS3_OP_FSETATTR] = { "FSETATTR", GFS3_OP_FSETATTR, server3_3_fsetattr, NULL, 0},
[GFS3_OP_READDIRP] = { "READDIRP", GFS3_OP_READDIRP, server3_3_readdirp, NULL, 0},
[GFS3_OP_FALLOCATE] = { "FALLOCATE", GFS3_OP_FALLOCATE, server3_3_fallocate, NULL, 0},
+ [GFS3_OP_DISCARD] = { "DISCARD", GFS3_OP_DISCARD, server3_3_discard, NULL, 0},
[GFS3_OP_RELEASE] = { "RELEASE", GFS3_OP_RELEASE, server3_3_release, NULL, 0},
[GFS3_OP_RELEASEDIR] = { "RELEASEDIR", GFS3_OP_RELEASEDIR, server3_3_releasedir, NULL, 0},
[GFS3_OP_FREMOVEXATTR] = { "FREMOVEXATTR", GFS3_OP_FREMOVEXATTR, server3_3_fremovexattr, NULL, 0},