[Ocfs2-tools-devel] [PATCH 4/8] O2info: Add running codes for '--volinfo'.

[Tristan Ye]

Task of '--volinfo' will be capable of two approaches, including
libocfs2 and ioctl solutions.

Signed-off-by: Tristan Ye <tristan.ye at oracle.com>
---
 o2info/main.c       |   16 +++++++
 o2info/operations.c |  114 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 130 insertions(+), 0 deletions(-)

diff --git a/o2info/main.c b/o2info/main.c
index 2ccc6b0..bda7dce 100644
--- a/o2info/main.c
+++ b/o2info/main.c
@@ -34,6 +34,8 @@
 
 #include "utils.h"
 
+extern struct o2info_operation volinfo_op;
+
 static LIST_HEAD(o2info_op_task_list);
 static int o2info_op_task_count;
 int no_coherency;
@@ -77,9 +79,23 @@ static struct o2info_option version_option = {
 	.opt_private = NULL,
 };
 
+static struct o2info_option volinfo_option = {
+	.opt_option	= {
+		.name		= "volinfo",
+		.val		= CHAR_MAX,
+		.has_arg	= 0,
+		.flag		= NULL,
+	},
+	.opt_help	= "   --volinfo",
+	.opt_handler	= NULL,
+	.opt_op		= &volinfo_op,
+	.opt_private	= NULL,
+};
+
 static struct o2info_option *options[] = {
 	&help_option,
 	&version_option,
+	&volinfo_option,
 	NULL,
 };
 
diff --git a/o2info/operations.c b/o2info/operations.c
index 1162f5e..f2abf9f 100644
--- a/o2info/operations.c
+++ b/o2info/operations.c
@@ -66,3 +66,117 @@ static void o2i_error(struct o2info_operation *op, const char *fmt, ...)
 
 	return;
 }
+
+struct o2info_volinfo {
+	uint32_t blocksize;
+	uint32_t clustersize;
+	uint16_t maxslots;
+	uint8_t label[OCFS2_MAX_VOL_LABEL_LEN];
+	uint8_t uuid_str[OCFS2_VOL_UUIDSTR_LEN];
+};
+
+static int get_volinfo_libocfs2(struct o2info_operation *op,
+				ocfs2_filesys *fs,
+				struct o2info_volinfo *vf)
+{
+	int rc = 0;
+	struct ocfs2_super_block *sb = NULL;
+
+	memset(vf, 0, sizeof(*vf));
+
+	sb = OCFS2_RAW_SB(fs->fs_super);
+	vf->blocksize = fs->fs_blocksize;
+	vf->clustersize = fs->fs_clustersize;
+	vf->maxslots = sb->s_max_slots;
+	memcpy(vf->label, sb->s_label, OCFS2_MAX_VOL_LABEL_LEN);
+	memcpy(vf->uuid_str, fs->uuid_str, OCFS2_VOL_UUIDSTR_LEN);
+
+	return rc;
+}
+
+static int get_volinfo_ioctl(struct o2info_operation *op,
+			     int fd,
+			     struct o2info_volinfo *vf)
+{
+	int rc = 0;
+
+	struct ocfs2_info_blocksize oib;
+	struct ocfs2_info_clustersize oic;
+	struct ocfs2_info_maxslots oim;
+	struct ocfs2_info_label oil;
+	struct ocfs2_info_uuid oiu;
+
+	memset(vf, 0, sizeof(*vf));
+
+	o2info_fill_request(&oib, OCFS2_INFO_BLOCKSIZE, no_coherency);
+	o2info_fill_request(&oic, OCFS2_INFO_CLUSTERSIZE, no_coherency);
+	o2info_fill_request(&oim, OCFS2_INFO_MAXSLOTS, no_coherency);
+	o2info_fill_request(&oil, OCFS2_INFO_LABEL, no_coherency);
+	o2info_fill_request(&oiu, OCFS2_INFO_UUID, no_coherency);
+
+	uint64_t reqs[5] = {(unsigned long)&oib,
+			    (unsigned long)&oic,
+			    (unsigned long)&oim,
+			    (unsigned long)&oil,
+			    (unsigned long)&oiu};
+
+	struct ocfs2_info info = {
+		.oi_requests = (uint64_t)reqs,
+		.oi_count = 5,
+	};
+
+	rc = ioctl(fd, OCFS2_IOC_INFO, &info);
+	if (rc) {
+		rc = errno;
+		o2i_error(op, "ioctl failed: %s\n", strerror(rc));
+		goto out;
+	}
+
+	if (oib.ib_req.ir_flags & OCFS2_INFO_FL_FILLED)
+		vf->blocksize = oib.ib_blocksize;
+
+	if (oic.ic_req.ir_flags & OCFS2_INFO_FL_FILLED)
+		vf->clustersize = oic.ic_clustersize;
+
+	if (oim.im_req.ir_flags & OCFS2_INFO_FL_FILLED)
+		vf->maxslots = oim.im_max_slots;
+
+	if (oil.il_req.ir_flags & OCFS2_INFO_FL_FILLED)
+		memcpy(vf->label, oil.il_label, OCFS2_MAX_VOL_LABEL_LEN);
+
+	if (oiu.iu_req.ir_flags & OCFS2_INFO_FL_FILLED)
+		memcpy(vf->uuid_str, oiu.iu_uuid_str, OCFS2_VOL_UUIDSTR_LEN);
+
+out:
+	return rc;
+}
+
+static int volinfo_run(struct o2info_operation *op,
+		       struct o2info_method *om,
+		       void *arg)
+{
+	int rc = 0;
+	static struct o2info_volinfo vf;
+
+#define VOLINFO "  Block Size: %u\n" \
+		"Cluster Size: %u\n" \
+		"   Max Slots: %u\n" \
+		"Volume Label: %s\n" \
+		" Volume UUID: %s\n"
+
+	if (om->om_method == O2INFO_USE_IOCTL)
+		rc = get_volinfo_ioctl(op, om->om_fd, &vf);
+	else
+		rc = get_volinfo_libocfs2(op, om->om_fs, &vf);
+	if (rc)
+		goto out;
+
+	fprintf(stdout, VOLINFO, vf.blocksize, vf.clustersize,
+		vf.maxslots, vf.label, vf.uuid_str);
+out:
+	return rc;
+}
+
+DEFINE_O2INFO_OP(volinfo,
+		 volinfo_run,
+		 NULL);
-- 
1.5.5