dm raid: a few cleanups

- ensure maximum device limit in superblock
- rename DMPF_* (print flags) to CTR_FLAG_* (constructor flags)
  and their respective struct raid_set member
- use strcasecmp() in raid10_format_to_md_layout() as in the constructor

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Reviewed-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

1 files changed, 46 insertions, 45 deletions

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 423e42e9a1ad..af49ddebaa62 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -17,6 +17,7 @@
 #include <linux/device-mapper.h>
 
 #define DM_MSG_PREFIX "raid"
+#define MAX_RAID_DEVICES        253 /* raid4/5/6 limit */
 
 static bool devices_handle_discard_safely = false;
 
@@ -45,25 +46,25 @@ struct raid_dev {
 };
 
 /*
- * Flags for rs->print_flags field.
+ * Flags for rs->ctr_flags field.
  */
-#define DMPF_SYNC              0x1
-#define DMPF_NOSYNC            0x2
-#define DMPF_REBUILD           0x4
-#define DMPF_DAEMON_SLEEP      0x8
-#define DMPF_MIN_RECOVERY_RATE 0x10
-#define DMPF_MAX_RECOVERY_RATE 0x20
-#define DMPF_MAX_WRITE_BEHIND  0x40
-#define DMPF_STRIPE_CACHE      0x80
-#define DMPF_REGION_SIZE       0x100
-#define DMPF_RAID10_COPIES     0x200
-#define DMPF_RAID10_FORMAT     0x400
+#define CTR_FLAG_SYNC              0x1
+#define CTR_FLAG_NOSYNC            0x2
+#define CTR_FLAG_REBUILD           0x4
+#define CTR_FLAG_DAEMON_SLEEP      0x8
+#define CTR_FLAG_MIN_RECOVERY_RATE 0x10
+#define CTR_FLAG_MAX_RECOVERY_RATE 0x20
+#define CTR_FLAG_MAX_WRITE_BEHIND  0x40
+#define CTR_FLAG_STRIPE_CACHE      0x80
+#define CTR_FLAG_REGION_SIZE       0x100
+#define CTR_FLAG_RAID10_COPIES     0x200
+#define CTR_FLAG_RAID10_FORMAT     0x400
 
 struct raid_set {
         struct dm_target *ti;
 
         uint32_t bitmap_loaded;
-        uint32_t print_flags;
+        uint32_t ctr_flags;
 
         struct mddev md;
         struct raid_type *raid_type;
@@ -119,15 +120,15 @@ static int raid10_format_to_md_layout(char *format, unsigned copies)
 {
         unsigned n = 1, f = 1;
 
-        if (!strcmp("near", format))
+        if (!strcasecmp("near", format))
                 n = copies;
         else
                 f = copies;
 
-        if (!strcmp("offset", format))
+        if (!strcasecmp("offset", format))
                 return 0x30000 | (f << 8) | n;
 
-        if (!strcmp("far", format))
+        if (!strcasecmp("far", format))
                 return 0x20000 | (f << 8) | n;
 
         return (f << 8) | n;
@@ -553,12 +554,12 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
         for (i = 0; i < num_raid_params; i++) {
                 if (!strcasecmp(argv[i], "nosync")) {
                         rs->md.recovery_cp = MaxSector;
-                        rs->print_flags |= DMPF_NOSYNC;
+                        rs->ctr_flags |= CTR_FLAG_NOSYNC;
                         continue;
                 }
                 if (!strcasecmp(argv[i], "sync")) {
                         rs->md.recovery_cp = 0;
-                        rs->print_flags |= DMPF_SYNC;
+                        rs->ctr_flags |= CTR_FLAG_SYNC;
                         continue;
                 }
 
@@ -583,7 +584,7 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
                                 return -EINVAL;
                         }
                         raid10_format = argv[i];
-                        rs->print_flags |= DMPF_RAID10_FORMAT;
+                        rs->ctr_flags |= CTR_FLAG_RAID10_FORMAT;
                         continue;
                 }
 
@@ -600,7 +601,7 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
                         }
                         clear_bit(In_sync, &rs->dev[value].rdev.flags);
                         rs->dev[value].rdev.recovery_offset = 0;
-                        rs->print_flags |= DMPF_REBUILD;
+                        rs->ctr_flags |= CTR_FLAG_REBUILD;
                 } else if (!strcasecmp(key, "write_mostly")) {
                         if (rs->raid_type->level != 1) {
                                 rs->ti->error = "write_mostly option is only valid for RAID1";
@@ -616,7 +617,7 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
                                 rs->ti->error = "max_write_behind option is only valid for RAID1";
                                 return -EINVAL;
                         }
-                        rs->print_flags |= DMPF_MAX_WRITE_BEHIND;
+                        rs->ctr_flags |= CTR_FLAG_MAX_WRITE_BEHIND;
 
                         /*
                          * In device-mapper, we specify things in sectors, but
@@ -629,14 +630,14 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
                         }
                         rs->md.bitmap_info.max_write_behind = value;
                 } else if (!strcasecmp(key, "daemon_sleep")) {
-                        rs->print_flags |= DMPF_DAEMON_SLEEP;
+                        rs->ctr_flags |= CTR_FLAG_DAEMON_SLEEP;
                         if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
                                 rs->ti->error = "daemon sleep period out of range";
                                 return -EINVAL;
                         }
                         rs->md.bitmap_info.daemon_sleep = value;
                 } else if (!strcasecmp(key, "stripe_cache")) {
-                        rs->print_flags |= DMPF_STRIPE_CACHE;
+                        rs->ctr_flags |= CTR_FLAG_STRIPE_CACHE;
 
                         /*
                          * In device-mapper, we specify things in sectors, but
@@ -654,21 +655,21 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
                                 return -EINVAL;
                         }
                 } else if (!strcasecmp(key, "min_recovery_rate")) {
-                        rs->print_flags |= DMPF_MIN_RECOVERY_RATE;
+                        rs->ctr_flags |= CTR_FLAG_MIN_RECOVERY_RATE;
                         if (value > INT_MAX) {
                                 rs->ti->error = "min_recovery_rate out of range";
                                 return -EINVAL;
                         }
                         rs->md.sync_speed_min = (int)value;
                 } else if (!strcasecmp(key, "max_recovery_rate")) {
-                        rs->print_flags |= DMPF_MAX_RECOVERY_RATE;
+                        rs->ctr_flags |= CTR_FLAG_MAX_RECOVERY_RATE;
                         if (value > INT_MAX) {
                                 rs->ti->error = "max_recovery_rate out of range";
                                 return -EINVAL;
                         }
                         rs->md.sync_speed_max = (int)value;
                 } else if (!strcasecmp(key, "region_size")) {
-                        rs->print_flags |= DMPF_REGION_SIZE;
+                        rs->ctr_flags |= CTR_FLAG_REGION_SIZE;
                         region_size = value;
                 } else if (!strcasecmp(key, "raid10_copies") &&
                            (rs->raid_type->level == 10)) {
@@ -676,7 +677,7 @@ static int parse_raid_params(struct raid_set *rs, char **argv,
                                 rs->ti->error = "Bad value for 'raid10_copies'";
                                 return -EINVAL;
                         }
-                        rs->print_flags |= DMPF_RAID10_COPIES;
+                        rs->ctr_flags |= CTR_FLAG_RAID10_COPIES;
                         raid10_copies = value;
                 } else {
                         DMERR("Unable to parse RAID parameter: %s", key);
@@ -945,7 +946,7 @@ static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev)
                 return -EINVAL;
         }
 
-        if (!(rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC)))
+        if (!(rs->ctr_flags & (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)))
                 mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
 
         /*
@@ -1071,7 +1072,7 @@ static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
         freshest = NULL;
         rdev_for_each_safe(rdev, tmp, mddev) {
                 /*
-                 * Skipping super_load due to DMPF_SYNC will cause
+                 * Skipping super_load due to CTR_FLAG_SYNC will cause
                  * the array to undergo initialization again as
                  * though it were new.  This is the intended effect
                  * of the "sync" directive.
@@ -1080,7 +1081,7 @@ static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
                  * that the "sync" directive is disallowed during the
                  * reshape.
                  */
-                if (rs->print_flags & DMPF_SYNC)
+                if (rs->ctr_flags & CTR_FLAG_SYNC)
                         continue;
 
                 if (!rdev->meta_bdev)
@@ -1241,7 +1242,7 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
         }
 
         if ((kstrtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) ||
-            (num_raid_devs >= INT_MAX)) {
+            (num_raid_devs > MAX_RAID_DEVICES)) {
                 ti->error = "Cannot understand number of raid devices";
                 return -EINVAL;
         }
@@ -1444,7 +1445,7 @@ static void raid_status(struct dm_target *ti, status_type_t type,
         case STATUSTYPE_TABLE:
                 /* The string you would use to construct this array */
                 for (i = 0; i < rs->md.raid_disks; i++) {
-                        if ((rs->print_flags & DMPF_REBUILD) &&
+                        if ((rs->ctr_flags & CTR_FLAG_REBUILD) &&
                             rs->dev[i].data_dev &&
                             !test_bit(In_sync, &rs->dev[i].rdev.flags))
                                 raid_param_cnt += 2; /* for rebuilds */
@@ -1453,33 +1454,33 @@ static void raid_status(struct dm_target *ti, status_type_t type,
                                 raid_param_cnt += 2;
                 }
 
-                raid_param_cnt += (hweight32(rs->print_flags & ~DMPF_REBUILD) * 2);
-                if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))
+                raid_param_cnt += (hweight32(rs->ctr_flags & ~CTR_FLAG_REBUILD) * 2);
+                if (rs->ctr_flags & (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC))
                         raid_param_cnt--;
 
                 DMEMIT("%s %u %u", rs->raid_type->name,
                        raid_param_cnt, rs->md.chunk_sectors);
 
-                if ((rs->print_flags & DMPF_SYNC) &&
+                if ((rs->ctr_flags & CTR_FLAG_SYNC) &&
                     (rs->md.recovery_cp == MaxSector))
                         DMEMIT(" sync");
-                if (rs->print_flags & DMPF_NOSYNC)
+                if (rs->ctr_flags & CTR_FLAG_NOSYNC)
                         DMEMIT(" nosync");
 
                 for (i = 0; i < rs->md.raid_disks; i++)
-                        if ((rs->print_flags & DMPF_REBUILD) &&
+                        if ((rs->ctr_flags & CTR_FLAG_REBUILD) &&
                             rs->dev[i].data_dev &&
                             !test_bit(In_sync, &rs->dev[i].rdev.flags))
                                 DMEMIT(" rebuild %u", i);
 
-                if (rs->print_flags & DMPF_DAEMON_SLEEP)
+                if (rs->ctr_flags & CTR_FLAG_DAEMON_SLEEP)
                         DMEMIT(" daemon_sleep %lu",
                                rs->md.bitmap_info.daemon_sleep);
 
-                if (rs->print_flags & DMPF_MIN_RECOVERY_RATE)
+                if (rs->ctr_flags & CTR_FLAG_MIN_RECOVERY_RATE)
                         DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min);
 
-                if (rs->print_flags & DMPF_MAX_RECOVERY_RATE)
+                if (rs->ctr_flags & CTR_FLAG_MAX_RECOVERY_RATE)
                         DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max);
 
                 for (i = 0; i < rs->md.raid_disks; i++)
@@ -1487,11 +1488,11 @@ static void raid_status(struct dm_target *ti, status_type_t type,
                             test_bit(WriteMostly, &rs->dev[i].rdev.flags))
                                 DMEMIT(" write_mostly %u", i);
 
-                if (rs->print_flags & DMPF_MAX_WRITE_BEHIND)
+                if (rs->ctr_flags & CTR_FLAG_MAX_WRITE_BEHIND)
                         DMEMIT(" max_write_behind %lu",
                                rs->md.bitmap_info.max_write_behind);
 
-                if (rs->print_flags & DMPF_STRIPE_CACHE) {
+                if (rs->ctr_flags & CTR_FLAG_STRIPE_CACHE) {
                         struct r5conf *conf = rs->md.private;
 
                         /* convert from kiB to sectors */
@@ -1499,15 +1500,15 @@ static void raid_status(struct dm_target *ti, status_type_t type,
                                conf ? conf->max_nr_stripes * 2 : 0);
                 }
 
-                if (rs->print_flags & DMPF_REGION_SIZE)
+                if (rs->ctr_flags & CTR_FLAG_REGION_SIZE)
                         DMEMIT(" region_size %lu",
                                rs->md.bitmap_info.chunksize >> 9);
 
-                if (rs->print_flags & DMPF_RAID10_COPIES)
+                if (rs->ctr_flags & CTR_FLAG_RAID10_COPIES)
                         DMEMIT(" raid10_copies %u",
                                raid10_md_layout_to_copies(rs->md.layout));
 
-                if (rs->print_flags & DMPF_RAID10_FORMAT)
+                if (rs->ctr_flags & CTR_FLAG_RAID10_FORMAT)
                         DMEMIT(" raid10_format %s",
                                raid10_md_layout_to_format(rs->md.layout));