Description of problem:
storage/posix: Fix posix_symlinks_match()

1) snprintf into linkname_expected should happen with PATH_MAX
2) comparison should happen with linkname_actual with string linkname_expected

114	posix_symlinks_match (xlator_t *this, loc_t *loc, uuid_t gfid)
115	{
116	        struct posix_private *priv = NULL;
117	        char linkname_actual[PATH_MAX] = {0,};
118	        char linkname_expected[PATH_MAX] = {0};
119	        char *dir_handle = NULL;
(gdb) 
120	        size_t len = 0;
121	        size_t handle_size = 0;
122	        gf_boolean_t ret = _gf_false;
123	
124	        priv = this->private;
125	        handle_size = POSIX_GFID_HANDLE_SIZE(priv->base_path_length);
126	        dir_handle = alloca0 (handle_size);
127	
128	        snprintf (linkname_expected, handle_size, "../../%02x/%02x/%s/%s",

<<<<<<<<< s/handle_size/PATH_MAX

129	                  loc->pargfid[0], loc->pargfid[1], uuid_utoa (loc->pargfid),
(gdb) 
130	                  loc->name);
131	
132	        MAKE_HANDLE_GFID_PATH (dir_handle, this, gfid, NULL);
133	        len = sys_readlink (dir_handle, linkname_actual, PATH_MAX);
134	        if (len < 0)
135	                goto out;
136	        linkname_actual[len] = '\0';
137	
138	        if (!strncmp (linkname_actual, linkname_expected, handle_size))
139	                ret = _gf_true;
(gdb) p handle_size
$12 = 77
(gdb) q
A debugging session is active.

(gdb) p linkname_actual 
$9 = "../../78/2f/782f8b99-a965-4b32-95ff-b698fdb0a08e/_gqac023.sbu.lab.eng.bos.redhat.com_00_1_.d", '\000' <repeats 4003 times>
(gdb) p linkname_expected 
$10 = "../../78/2f/782f8b99-a965-4b32-95ff-b698fdb0a08e/_gqac023.sbu.lab.eng.bos.re", '\000' <repeats 4019 times>


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Expected results:


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