quiesce: add fallocate and seek fops

quiesce is useful in a gfproxy setup where if gfproxy machine goes
down the fop would be replayed. Hence only added the fops which is
supported by fuse layer to start with. With this patch, no behavior
change is added (ie, volfile change etc). Just making sure to have
the translator up-to-date so that if required we can consume it.

Updates #242

Change-Id: Id3bf204f2ccd42c3ac8f88d85836ecb855703e02
Signed-off-by: Amar Tumballi <amarts@redhat.com>
Signed-off-by: Poornima G <pgurusid@redhat.com>

2 files changed, 141 insertions, 4 deletions

diff --git a/xlators/features/quiesce/src/quiesce.c b/xlators/features/quiesce/src/quiesce.c
index c78cabb31f3..59e57d284a0 100644
--- a/xlators/features/quiesce/src/quiesce.c
+++ b/xlators/features/quiesce/src/quiesce.c
@@ -2421,6 +2421,120 @@ quiesce_fsetattr (call_frame_t *frame,
 }
 
 int32_t
+quiesce_fallocate (call_frame_t *frame,
+                   xlator_t *this,
+                   fd_t *fd, int32_t mode,
+                   off_t offset, size_t len, dict_t *xdata)
+{
+	quiesce_priv_t *priv = NULL;
+        call_stub_t    *stub = NULL;
+        quiesce_local_t *local = NULL;
+
+        priv = this->private;
+
+        if (priv && priv->pass_through) {
+                local = mem_get0 (priv->local_pool);
+                local->fd = fd_ref (fd);
+                local->offset = offset;
+                local->len = len;
+                local->flag = mode;
+
+                frame->local = local;
+
+                STACK_WIND (frame,
+                            default_fallocate_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->fallocate,
+                            fd, mode, offset, len, xdata);
+                return 0;
+        }
+
+        stub = fop_fallocate_stub (frame, default_fallocate_resume, fd,
+                                   mode, offset, len, xdata);
+        if (!stub) {
+                STACK_UNWIND_STRICT (fallocate, frame, -1, ENOMEM,
+                                     NULL, NULL, NULL);
+                return 0;
+        }
+
+        gf_quiesce_enqueue (this, stub);
+
+        return 0;
+}
+
+
+int
+quiesce_seek_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, off_t offset,
+                  dict_t *xdata)
+{
+        call_stub_t    *stub = NULL;
+        quiesce_local_t *local = NULL;
+
+        local = frame->local;
+        frame->local = NULL;
+        if ((op_ret == -1) && (op_errno == ENOTCONN)) {
+                /* Re-transmit (by putting in the queue) */
+                stub = fop_seek_stub (frame, default_seek_resume,
+                                      local->fd, local->offset,
+                                      local->what, xdata);
+                if (!stub) {
+                        STACK_UNWIND_STRICT (seek, frame, -1, ENOMEM, 0, NULL);
+                        goto out;
+                }
+
+                gf_quiesce_enqueue (this, stub);
+                goto out;
+        }
+
+        STACK_UNWIND_STRICT (seek, frame, op_ret, op_errno, offset, xdata);
+out:
+        gf_quiesce_local_wipe (this, local);
+
+        return 0;
+}
+
+int
+quiesce_seek (call_frame_t *frame, xlator_t *this, fd_t *fd,
+              off_t offset, gf_seek_what_t what, dict_t *xdata)
+{
+	quiesce_priv_t *priv = NULL;
+        call_stub_t    *stub = NULL;
+        quiesce_local_t *local = NULL;
+
+        priv = this->private;
+
+        if (priv && priv->pass_through) {
+                local = mem_get0 (priv->local_pool);
+                local->fd = fd_ref (fd);
+                local->offset = offset;
+                local->what = what;
+
+                frame->local = local;
+
+                STACK_WIND (frame,
+                            quiesce_seek_cbk,
+                            FIRST_CHILD(this),
+                            FIRST_CHILD(this)->fops->seek,
+                            fd, offset, what, xdata);
+                return 0;
+        }
+
+        stub = fop_seek_stub (frame, default_seek_resume, fd,
+                              offset, what, xdata);
+        if (!stub) {
+                STACK_UNWIND_STRICT (seek, frame, -1, ENOMEM, 0, NULL);
+                return 0;
+        }
+
+        gf_quiesce_enqueue (this, stub);
+
+        return 0;
+}
+
+
+
+int32_t
 mem_acct_init (xlator_t *this)
 {
         int     ret = -1;
@@ -2431,6 +2545,20 @@ mem_acct_init (xlator_t *this)
 }
 
 int
+reconfigure (xlator_t *this, dict_t *options)
+{
+        int32_t       ret      = -1;
+        quiesce_priv_t *priv = NULL;
+
+        priv = this->private;
+
+        GF_OPTION_RECONF("timeout", priv->timeout, options, time, out);
+        ret = 0;
+out:
+        return ret;
+}
+
+int
 init (xlator_t *this)
 {
         int ret = -1;
@@ -2560,6 +2688,7 @@ struct xlator_fops fops = {
 	.mkdir       = quiesce_mkdir,
 	.rmdir       = quiesce_rmdir,
 	.rename      = quiesce_rename,
+        .fallocate   = quiesce_fallocate,
 
         /* The below calls are known to change state, hence
            re-transmittion is not advised */
@@ -2594,7 +2723,7 @@ struct xlator_fops fops = {
 	.readdir     = quiesce_readdir,
 	.readdirp    = quiesce_readdirp,
 	.fsyncdir    = quiesce_fsyncdir,
-
+        .seek        = quiesce_seek,
 };
 
 struct xlator_dumpops dumpops;
@@ -2606,10 +2735,14 @@ struct xlator_cbks cbks;
 struct volume_options options[] = {
         { .key = {"timeout"},
           .type = GF_OPTION_TYPE_TIME,
-          .default_value = "20s",
-          .description = "timeout for ignoring all the quiesced calls",
-          .tags = {"debug", "dev-only"},
+          .default_value = "20",
+          .description = "After 'timeout' seconds since the time 'quiesce' "
+          "option was set to \"!pass-through\", acknowledgements to file "
+          "operations are no longer quiesced and previously "
+          "quiesced acknowledgements are sent to the application",
+          .tags = {"debug", "diagnose"},
           .op_version = { GD_OP_VERSION_4_0_0 },
+          .flags = OPT_FLAG_CLIENT_OPT,
         },
 	{ .key  = {NULL} },
 };
diff --git a/xlators/features/quiesce/src/quiesce.h b/xlators/features/quiesce/src/quiesce.h
index a5fb43ccdc8..e76523c602b 100644
--- a/xlators/features/quiesce/src/quiesce.h
+++ b/xlators/features/quiesce/src/quiesce.h
@@ -47,6 +47,10 @@ typedef struct {
         gf_xattrop_flags_t  xattrop_flags;
         int32_t             wbflags;
         uint32_t            io_flag;
+        /* for fallocate */
+        size_t len;
+        /* for lseek */
+        gf_seek_what_t what;
 } quiesce_local_t;
 
 #endif