clean up handling of special client pids

- no need to name a lower boundary [drop GF_CLIENT_PID_MIN]
- drop utility function to decide about pid speciality [gf_pid_client_check()];
  when we implement uniform policy for special pids, use just comparison with
  GF_CLIENT_PID_MAX (currently such uniform policy exists in io-threads, where
  special clients get lowest priority)
- io-threads: drop numeric literal, use GF_CLIENT_PID_MAX
- xattr flipping (in fuse):
  - fuse_xattr_alloc_default() made static
  - avoid compiler warnings wrt. partial enum traversal in the switch
    by not casting the original numeric value to gf_client_pid_t (enum) type
  - trim down the switch to those cases with which there is something to do
    [GF_CLIENT_PID_GSYNCD, GF_CLIENT_PID_HADOOP]
  - eliminate the (theoretical) chance of succesfully returning
    from fuse_flip_xattr_ns() with unallocated nkey
    [as was the case with pids GF_CLIENT_PID_{MIN,MAX,DEFRAG}]

Change-Id: Ic2b83b908d8e3be23a7fba1e5895869828a6194b
BUG: 765433
Signed-off-by: Csaba Henk <csaba@redhat.com>
Reviewed-on: http://review.gluster.com/3170
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-by: Anand Avati <avati@redhat.com>

5 files changed, 6 insertions, 37 deletions

diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index 0e133c005..5e849e066 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -2017,14 +2017,6 @@ get_mem_size ()
 	return memsize;
 }
 
-
-int
-gf_client_pid_check (gf_client_pid_t npid)
-{
-        return ( (npid > GF_CLIENT_PID_MIN) && (npid < GF_CLIENT_PID_MAX) )
-                ? 0 : -1;
-}
-
 /* Strips all whitespace characters in a string and returns length of new string
  * on success
  */
diff --git a/libglusterfs/src/common-utils.h b/libglusterfs/src/common-utils.h
index 7e6da9ed2..c15abdbaa 100644
--- a/libglusterfs/src/common-utils.h
+++ b/libglusterfs/src/common-utils.h
@@ -105,7 +105,6 @@ enum _gf_client_pid
         GF_CLIENT_PID_GSYNCD = -1,
         GF_CLIENT_PID_HADOOP = -2,
         GF_CLIENT_PID_DEFRAG = -3,
-        GF_CLIENT_PID_MIN    = -4
 };
 
 typedef enum _gf_boolean gf_boolean_t;
@@ -493,6 +492,5 @@ char *get_host_name (char *word, char **host);
 char *get_path_name (char *word, char **path);
 void gf_path_strip_trailing_slashes (char *path);
 uint64_t get_mem_size ();
-int gf_client_pid_check (gf_client_pid_t npid);
 int gf_strip_whitespace (char *str, int len);
 #endif /* _COMMON_UTILS_H */
diff --git a/xlators/mount/fuse/src/fuse-bridge.h b/xlators/mount/fuse/src/fuse-bridge.h
index d20413055..3711ca54d 100644
--- a/xlators/mount/fuse/src/fuse-bridge.h
+++ b/xlators/mount/fuse/src/fuse-bridge.h
@@ -350,7 +350,6 @@ inode_t *fuse_ino_to_inode (uint64_t ino, xlator_t *fuse);
 int send_fuse_err (xlator_t *this, fuse_in_header_t *finh, int error);
 int fuse_gfid_set (fuse_state_t *state);
 int fuse_flip_xattr_ns (struct fuse_private *priv, char *okey, char **nkey);
-int fuse_xattr_alloc_default (char *okey, char **nkey);
 fuse_fd_ctx_t * __fuse_fd_ctx_check_n_create (fd_t *fd, xlator_t *this);
 fuse_fd_ctx_t * fuse_fd_ctx_check_n_create (fd_t *fd, xlator_t *this);
 
diff --git a/xlators/mount/fuse/src/fuse-helpers.c b/xlators/mount/fuse/src/fuse-helpers.c
index 8af19de9d..452a48194 100644
--- a/xlators/mount/fuse/src/fuse-helpers.c
+++ b/xlators/mount/fuse/src/fuse-helpers.c
@@ -450,7 +450,7 @@ fuse_do_flip_xattr_ns (char *okey, const char *nns, char **nkey)
         return ret;
 }
 
-int
+static int
 fuse_xattr_alloc_default (char *okey, char **nkey)
 {
         int ret = 0;
@@ -469,28 +469,12 @@ fuse_flip_xattr_ns (fuse_private_t *priv, char *okey, char **nkey)
 {
         int             ret       = 0;
         gf_boolean_t    need_flip = _gf_false;
-        gf_client_pid_t npid      = 0;
-
-        npid = priv->client_pid;
-        if (gf_client_pid_check (npid)) {
-                ret = fuse_xattr_alloc_default (okey, nkey);
-                goto out;
-        }
-
-        switch (npid) {
-                /*
-                 * These two cases will never execute as we check the
-                 * pid range above, but are kept to keep the compiler
-                 * happy.
-                 */
-        case GF_CLIENT_PID_MAX:
-        case GF_CLIENT_PID_MIN:
-                goto out;
 
+        switch (priv->client_pid) {
         case GF_CLIENT_PID_GSYNCD:
                 /* valid xattr(s): *xtime, volume-mark* */
                 gf_log("glusterfs-fuse", GF_LOG_DEBUG, "PID: %d, checking xattr(s): "
-                       "volume-mark*, *xtime", npid);
+                       "volume-mark*, *xtime", priv->client_pid);
                 if ( (strcmp (okey, UNPRIV_XA_NS".glusterfs.volume-mark") == 0)
                      || (fnmatch (UNPRIV_XA_NS".glusterfs.volume-mark.*", okey, FNM_PERIOD) == 0)
                      || (fnmatch (UNPRIV_XA_NS".glusterfs.*.xtime", okey, FNM_PERIOD) == 0) )
@@ -500,14 +484,10 @@ fuse_flip_xattr_ns (fuse_private_t *priv, char *okey, char **nkey)
         case GF_CLIENT_PID_HADOOP:
                 /* valid xattr(s): pathinfo */
                 gf_log("glusterfs-fuse", GF_LOG_DEBUG, "PID: %d, checking xattr(s): "
-                       "pathinfo", npid);
+                       "pathinfo", priv->client_pid);
                 if (strcmp (okey, UNPRIV_XA_NS".glusterfs.pathinfo") == 0)
                         need_flip = _gf_true;
                 break;
-
-                /* This is never true for fuse mount, as defrag uses syncops */
-        case GF_CLIENT_PID_DEFRAG:
-                goto out;
         }
 
         if (need_flip) {
@@ -518,6 +498,6 @@ fuse_flip_xattr_ns (fuse_private_t *priv, char *okey, char **nkey)
                 /* if we cannot match, continue with what we got */
                 ret = fuse_xattr_alloc_default (okey, nkey);
         }
- out:
+
         return ret;
 }
diff --git a/xlators/performance/io-threads/src/io-threads.c b/xlators/performance/io-threads/src/io-threads.c
index d316a19a4..66864fcd4 100644
--- a/xlators/performance/io-threads/src/io-threads.c
+++ b/xlators/performance/io-threads/src/io-threads.c
@@ -202,7 +202,7 @@ iot_schedule (call_frame_t *frame, xlator_t *this, call_stub_t *stub)
         int             ret = -1;
         iot_pri_t       pri = IOT_PRI_MAX - 1;
 
-        if (frame->root->pid < 0) {
+        if (frame->root->pid < GF_CLIENT_PID_MAX) {
                 pri = IOT_PRI_LEAST;
                 goto out;
         }