[PATCH] dm: improve error message consistency

Tidy device-mapper error messages to include context information
automatically.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 21 insertions, 22 deletions

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 1816f30678ed..217615b33223 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -21,6 +21,7 @@
 #include <linux/workqueue.h>
 #include <asm/atomic.h>
 
+#define DM_MSG_PREFIX "multipath"
 #define MESG_STR(x) x, sizeof(x)
 
 /* Path properties */
@@ -446,8 +447,6 @@ struct param {
 	char *error;
 };
 
-#define ESTR(s) ("dm-multipath: " s)
-
 static int read_param(struct param *param, char *str, unsigned *v, char **error)
 {
 	if (!str ||
@@ -495,12 +494,12 @@ static int parse_path_selector(struct arg_set *as, struct priority_group *pg,
 	unsigned ps_argc;
 
 	static struct param _params[] = {
-		{0, 1024, ESTR("invalid number of path selector args")},
+		{0, 1024, "invalid number of path selector args"},
 	};
 
 	pst = dm_get_path_selector(shift(as));
 	if (!pst) {
-		ti->error = ESTR("unknown path selector type");
+		ti->error = "unknown path selector type";
 		return -EINVAL;
 	}
 
@@ -511,7 +510,7 @@ static int parse_path_selector(struct arg_set *as, struct priority_group *pg,
 	r = pst->create(&pg->ps, ps_argc, as->argv);
 	if (r) {
 		dm_put_path_selector(pst);
-		ti->error = ESTR("path selector constructor failed");
+		ti->error = "path selector constructor failed";
 		return r;
 	}
 
@@ -529,7 +528,7 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
 
 	/* we need at least a path arg */
 	if (as->argc < 1) {
-		ti->error = ESTR("no device given");
+		ti->error = "no device given";
 		return NULL;
 	}
 
@@ -540,7 +539,7 @@ static struct pgpath *parse_path(struct arg_set *as, struct path_selector *ps,
 	r = dm_get_device(ti, shift(as), ti->begin, ti->len,
 			  dm_table_get_mode(ti->table), &p->path.dev);
 	if (r) {
-		ti->error = ESTR("error getting device");
+		ti->error = "error getting device";
 		goto bad;
 	}
 
@@ -562,8 +561,8 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
 						   struct dm_target *ti)
 {
 	static struct param _params[] = {
-		{1, 1024, ESTR("invalid number of paths")},
-		{0, 1024, ESTR("invalid number of selector args")}
+		{1, 1024, "invalid number of paths"},
+		{0, 1024, "invalid number of selector args"}
 	};
 
 	int r;
@@ -572,13 +571,13 @@ static struct priority_group *parse_priority_group(struct arg_set *as,
 
 	if (as->argc < 2) {
 		as->argc = 0;
-		ti->error = ESTR("not enough priority group aruments");
+		ti->error = "not enough priority group aruments";
 		return NULL;
 	}
 
 	pg = alloc_priority_group();
 	if (!pg) {
-		ti->error = ESTR("couldn't allocate priority group");
+		ti->error = "couldn't allocate priority group";
 		return NULL;
 	}
 	pg->m = m;
@@ -633,7 +632,7 @@ static int parse_hw_handler(struct arg_set *as, struct multipath *m,
 	unsigned hw_argc;
 
 	static struct param _params[] = {
-		{0, 1024, ESTR("invalid number of hardware handler args")},
+		{0, 1024, "invalid number of hardware handler args"},
 	};
 
 	r = read_param(_params, shift(as), &hw_argc, &ti->error);
@@ -645,14 +644,14 @@ static int parse_hw_handler(struct arg_set *as, struct multipath *m,
 
 	hwht = dm_get_hw_handler(shift(as));
 	if (!hwht) {
-		ti->error = ESTR("unknown hardware handler type");
+		ti->error = "unknown hardware handler type";
 		return -EINVAL;
 	}
 
 	r = hwht->create(&m->hw_handler, hw_argc - 1, as->argv);
 	if (r) {
 		dm_put_hw_handler(hwht);
-		ti->error = ESTR("hardware handler constructor failed");
+		ti->error = "hardware handler constructor failed";
 		return r;
 	}
 
@@ -669,7 +668,7 @@ static int parse_features(struct arg_set *as, struct multipath *m,
 	unsigned argc;
 
 	static struct param _params[] = {
-		{0, 1, ESTR("invalid number of feature args")},
+		{0, 1, "invalid number of feature args"},
 	};
 
 	r = read_param(_params, shift(as), &argc, &ti->error);
@@ -692,8 +691,8 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
 {
 	/* target parameters */
 	static struct param _params[] = {
-		{1, 1024, ESTR("invalid number of priority groups")},
-		{1, 1024, ESTR("invalid initial priority group number")},
+		{1, 1024, "invalid number of priority groups"},
+		{1, 1024, "invalid initial priority group number"},
 	};
 
 	int r;
@@ -707,7 +706,7 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
 
 	m = alloc_multipath();
 	if (!m) {
-		ti->error = ESTR("can't allocate multipath");
+		ti->error = "can't allocate multipath";
 		return -EINVAL;
 	}
 
@@ -746,7 +745,7 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
 	}
 
 	if (pg_count != m->nr_priority_groups) {
-		ti->error = ESTR("priority group count mismatch");
+		ti->error = "priority group count mismatch";
 		r = -EINVAL;
 		goto bad;
 	}
@@ -807,7 +806,7 @@ static int fail_path(struct pgpath *pgpath)
 	if (!pgpath->path.is_active)
 		goto out;
 
-	DMWARN("dm-multipath: Failing path %s.", pgpath->path.dev->name);
+	DMWARN("Failing path %s.", pgpath->path.dev->name);
 
 	pgpath->pg->ps.type->fail_path(&pgpath->pg->ps, &pgpath->path);
 	pgpath->path.is_active = 0;
@@ -1250,7 +1249,7 @@ static int multipath_message(struct dm_target *ti, unsigned argc, char **argv)
 	r = dm_get_device(ti, argv[1], ti->begin, ti->len,
 			  dm_table_get_mode(ti->table), &dev);
 	if (r) {
-		DMWARN("dm-multipath message: error getting device %s",
+		DMWARN("message: error getting device %s",
 		       argv[1]);
 		return -EINVAL;
 	}
@@ -1309,7 +1308,7 @@ static int __init dm_multipath_init(void)
 		return -ENOMEM;
 	}
 
-	DMINFO("dm-multipath version %u.%u.%u loaded",
+	DMINFO("version %u.%u.%u loaded",
 	       multipath_target.version[0], multipath_target.version[1],
 	       multipath_target.version[2]);