[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]);