features/bit-rot-stub: implement mknod fop

    Backport of http://review.gluster.org/10790

With the absence of mknod() fop implementation in bitrot stub,
further operations that trigger versioning resulted in crashes
as they expect the inode context to be valid. Therefore, this
patch implements mknod() following similar simantics to fops
such as create().

Furthermore, bitrot stub test C program is fixed to stop lying
and validate obj versions according to the versioning protocol.

Change-Id: If76f252577445d1851d6c13c7e969e864e2183ef
BUG: 1226139
Original-Author: Raghavendra Bhat <raghavendra@redhat.com>
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-on: http://review.gluster.org/10987
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Tested-by: Gluster Build System <jenkins@build.gluster.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/xlators/features/bit-rot/src/stub/bit-rot-stub.c b/xlators/features/bit-rot/src/stub/bit-rot-stub.c
index 1827f48c1c9..69e326b17e1 100644
--- a/xlators/features/bit-rot/src/stub/bit-rot-stub.c
+++ b/xlators/features/bit-rot/src/stub/bit-rot-stub.c
@@ -1647,6 +1647,10 @@ br_stub_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         if (ret < 0) {
                 ret = br_stub_init_inode_versions (this, fd, inode, version,
                                                    _gf_true);
+                if (ret) {
+                        op_ret = -1;
+                        op_errno = EINVAL;
+                }
         } else {
                 ctx = (br_stub_inode_ctx_t *)(long)ctx_addr;
                 ret = br_stub_add_fd_to_inode (this, fd, ctx);
@@ -1679,6 +1683,52 @@ unwind:
         return 0;
 }
 
+int
+br_stub_mknod_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                   int op_ret, int op_errno, inode_t *inode,
+                    struct iatt *stbuf, struct iatt *preparent,
+                    struct iatt *postparent, dict_t *xdata)
+{
+        int32_t              ret      = -1;
+        unsigned long        version  = BITROT_DEFAULT_CURRENT_VERSION;
+
+        if (op_ret < 0)
+                goto unwind;
+
+        ret = br_stub_init_inode_versions (this, NULL, inode, version,
+                                           _gf_true);
+        /**
+         * Like lookup, if init_inode_versions fail, return EINVAL
+         */
+        if (ret) {
+                op_ret = -1;
+                op_errno = EINVAL;
+        }
+
+unwind:
+        STACK_UNWIND_STRICT (mknod, frame, op_ret, op_errno,
+                             inode, stbuf, preparent, postparent, xdata);
+        return 0;
+}
+
+int
+br_stub_mknod (call_frame_t *frame, xlator_t *this,
+                loc_t *loc, mode_t mode, dev_t dev, mode_t umask, dict_t *xdata)
+{
+        GF_VALIDATE_OR_GOTO ("bit-rot-stub", this, unwind);
+        GF_VALIDATE_OR_GOTO (this->name, loc, unwind);
+        GF_VALIDATE_OR_GOTO (this->name, loc->inode, unwind);
+
+        STACK_WIND (frame, br_stub_mknod_cbk, FIRST_CHILD (this),
+                    FIRST_CHILD (this)->fops->mknod,
+                    loc, mode, dev, umask, xdata);
+        return 0;
+unwind:
+        STACK_UNWIND_STRICT (mknod, frame, -1, EINVAL, NULL, NULL, NULL,
+                             NULL, NULL);
+        return 0;
+}
+
 /** }}} */
 
 static inline int32_t
@@ -2144,6 +2194,7 @@ struct xlator_fops fops = {
         .writev    = br_stub_writev,
         .truncate  = br_stub_truncate,
         .ftruncate = br_stub_ftruncate,
+        .mknod     = br_stub_mknod,
 };
 
 struct xlator_cbks cbks = {