storage/posix: UNWIND right op_error and op_errno in *setxattr()

1. errno was being set after gf_log() in posix_{f}handle_pair, this
would cause errno to be overwritten.

2. dht would expect -1 for indication of failure in setxattr
callback (dht_err_cbk()). posix_{f}setxattr has been changed to set
op_ret as -1 instead of -op_errno.

3. dict_foreach() has been changed to return an error if the invoked
fn() returns < 0.

Bug report and test case credits to Zorro Lang <zlang@redhat.com>

Change-Id: I96c15f12a5d7717b7584ba392f390a0b4f704a98
BUG: 1051896
Signed-off-by: Vijay Bellur <vbellur@redhat.com>
Reviewed-on: http://review.gluster.org/6684
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Anand Avati <avati@redhat.com>

1 files changed, 94 insertions, 0 deletions

diff --git a/tests/bugs/bug-1051896.c b/tests/bugs/bug-1051896.c
new file mode 100644
index 0000000000..0ffd819864
--- /dev/null
+++ b/tests/bugs/bug-1051896.c
@@ -0,0 +1,94 @@
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <grp.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <assert.h>
+#include <sys/types.h>
+#include <utime.h>
+#include <sys/acl.h>
+
+int do_setfacl(const char *path, const char *options, const char *textacl)
+{
+	int r;
+	int type;
+	acl_t acl;
+	int dob;
+	int dok;
+	int dom;
+	struct stat st;
+	char textmode[30];
+
+	r = 0;
+	dob = strchr(options,'b') != (char*)NULL;
+	dok = strchr(options,'k') != (char*)NULL;
+	dom = strchr(options,'m') != (char*)NULL;
+	if ((dom && !textacl)
+	    || (!dom && (textacl || (!dok && !dob) ||
+                                    strchr(options,'d')))) {
+		errno = EBADRQC; /* "bad request" */
+		r = -1;
+	} else {
+		if (dob || dok) {
+			r = acl_delete_def_file(path);
+		}
+		if (dob && !r) {
+			if (!stat(path,&st)) {
+				sprintf(textmode,
+                                        "u::%c%c%c,g::%c%c%c,o::%c%c%c",
+					(st.st_mode & 0400 ? 'r' : '-'),
+					(st.st_mode & 0200 ? 'w' : '-'),
+					(st.st_mode & 0100 ? 'x' : '-'),
+					(st.st_mode & 0040 ? 'r' : '-'),
+					(st.st_mode & 0020 ? 'w' : '-'),
+					(st.st_mode & 0010 ? 'x' : '-'),
+					(st.st_mode & 004 ? 'r' : '-'),
+					(st.st_mode & 002 ? 'w' : '-'),
+					(st.st_mode & 001 ? 'x' : '-'));
+				acl = acl_from_text(textmode);
+				if (acl) {
+					r = acl_set_file(path,
+                                                         ACL_TYPE_ACCESS,acl);
+					acl_free(acl);
+				} else
+					r = -1;
+			} else
+				r = -1;
+		}
+		if (!r && dom) {
+			if (strchr(options,'d'))
+				type = ACL_TYPE_DEFAULT;
+			else
+				type = ACL_TYPE_ACCESS;
+			acl = acl_from_text(textacl);
+			if (acl) {
+				r = acl_set_file(path,type,acl);
+				acl_free(acl);
+			} else
+				r = -1;
+		}
+	}
+	if (r)
+		r = -errno;
+	return (r);
+}
+
+
+int main(int argc, char *argv[]){
+	int rc = 0;
+	if (argc != 4) {
+		fprintf(stderr,
+                        "usage: ./setfacl_test <path> <options> <textacl>\n");
+		return 0;
+	}
+	if ((rc = do_setfacl(argv[1], argv[2], argv[3])) != 0){
+		fprintf(stderr, "do_setfacl failed: %s\n", strerror(errno));
+		return rc;
+	}
+	return 0;
+}