[PATCH] md: convert 'faulty' and 'in_sync' fields to bits in 'flags' field

This has the advantage of removing the confusion caused by 'rdev_t' and
'mddev_t' both having 'in_sync' fields.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 45 insertions, 47 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 3fb80397f8aa..9dfa063d1c6a 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -610,7 +610,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
         mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
 
         rdev->raid_disk = -1;
-        rdev->in_sync = 0;
+        rdev->flags = 0;
         if (mddev->raid_disks == 0) {
                 mddev->major_version = 0;
                 mddev->minor_version = sb->minor_version;
@@ -671,21 +671,19 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
                 return 0;
 
         if (mddev->level != LEVEL_MULTIPATH) {
-                rdev->faulty = 0;
-                rdev->flags = 0;
                 desc = sb->disks + rdev->desc_nr;
 
                 if (desc->state & (1<<MD_DISK_FAULTY))
-                        rdev->faulty = 1;
+                        set_bit(Faulty, &rdev->flags);
                 else if (desc->state & (1<<MD_DISK_SYNC) &&
                          desc->raid_disk < mddev->raid_disks) {
-                        rdev->in_sync = 1;
+                        set_bit(In_sync, &rdev->flags);
                         rdev->raid_disk = desc->raid_disk;
                 }
                 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
                         set_bit(WriteMostly, &rdev->flags);
         } else /* MULTIPATH are always insync */
-                rdev->in_sync = 1;
+                set_bit(In_sync, &rdev->flags);
         return 0;
 }
 
@@ -761,7 +759,8 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
         ITERATE_RDEV(mddev,rdev2,tmp) {
                 mdp_disk_t *d;
                 int desc_nr;
-                if (rdev2->raid_disk >= 0 && rdev2->in_sync && !rdev2->faulty)
+                if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
+                    && !test_bit(Faulty, &rdev2->flags))
                         desc_nr = rdev2->raid_disk;
                 else
                         desc_nr = next_spare++;
@@ -780,14 +779,15 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
                 d->number = rdev2->desc_nr;
                 d->major = MAJOR(rdev2->bdev->bd_dev);
                 d->minor = MINOR(rdev2->bdev->bd_dev);
-                if (rdev2->raid_disk >= 0 && rdev2->in_sync && !rdev2->faulty)
+                if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
+                    && !test_bit(Faulty, &rdev2->flags))
                         d->raid_disk = rdev2->raid_disk;
                 else
                         d->raid_disk = rdev2->desc_nr; /* compatibility */
-                if (rdev2->faulty) {
+                if (test_bit(Faulty, &rdev2->flags)) {
                         d->state = (1<<MD_DISK_FAULTY);
                         failed++;
-                } else if (rdev2->in_sync) {
+                } else if (test_bit(In_sync, &rdev2->flags)) {
                         d->state = (1<<MD_DISK_ACTIVE);
                         d->state |= (1<<MD_DISK_SYNC);
                         active++;
@@ -975,7 +975,7 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
         struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
 
         rdev->raid_disk = -1;
-        rdev->in_sync = 0;
+        rdev->flags = 0;
         if (mddev->raid_disks == 0) {
                 mddev->major_version = 1;
                 mddev->patch_version = 0;
@@ -1027,22 +1027,19 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
                 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
                 switch(role) {
                 case 0xffff: /* spare */
-                        rdev->faulty = 0;
                         break;
                 case 0xfffe: /* faulty */
-                        rdev->faulty = 1;
+                        set_bit(Faulty, &rdev->flags);
                         break;
                 default:
-                        rdev->in_sync = 1;
-                        rdev->faulty = 0;
+                        set_bit(In_sync, &rdev->flags);
                         rdev->raid_disk = role;
                         break;
                 }
-                rdev->flags = 0;
                 if (sb->devflags & WriteMostly1)
                         set_bit(WriteMostly, &rdev->flags);
         } else /* MULTIPATH are always insync */
-                rdev->in_sync = 1;
+                set_bit(In_sync, &rdev->flags);
 
         return 0;
 }
@@ -1086,9 +1083,9 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
         
         ITERATE_RDEV(mddev,rdev2,tmp) {
                 i = rdev2->desc_nr;
-                if (rdev2->faulty)
+                if (test_bit(Faulty, &rdev2->flags))
                         sb->dev_roles[i] = cpu_to_le16(0xfffe);
-                else if (rdev2->in_sync)
+                else if (test_bit(In_sync, &rdev2->flags))
                         sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
                 else
                         sb->dev_roles[i] = cpu_to_le16(0xffff);
@@ -1327,7 +1324,8 @@ static void print_rdev(mdk_rdev_t *rdev)
         char b[BDEVNAME_SIZE];
         printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
                 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
-                rdev->faulty, rdev->in_sync, rdev->desc_nr);
+                test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
+                rdev->desc_nr);
         if (rdev->sb_loaded) {
                 printk(KERN_INFO "md: rdev superblock:\n");
                 print_sb((mdp_super_t*)page_address(rdev->sb_page));
@@ -1421,11 +1419,11 @@ repeat:
         ITERATE_RDEV(mddev,rdev,tmp) {
                 char b[BDEVNAME_SIZE];
                 dprintk(KERN_INFO "md: ");
-                if (rdev->faulty)
+                if (test_bit(Faulty, &rdev->flags))
                         dprintk("(skipping faulty ");
 
                 dprintk("%s ", bdevname(rdev->bdev,b));
-                if (!rdev->faulty) {
+                if (!test_bit(Faulty, &rdev->flags)) {
                         md_super_write(mddev,rdev,
                                        rdev->sb_offset<<1, rdev->sb_size,
                                        rdev->sb_page);
@@ -1466,15 +1464,16 @@ rdev_show_state(mdk_rdev_t *rdev, char *page)
         char *sep = "";
         int len=0;
 
-        if (rdev->faulty) {
+        if (test_bit(Faulty, &rdev->flags)) {
                 len+= sprintf(page+len, "%sfaulty",sep);
                 sep = ",";
         }
-        if (rdev->in_sync) {
+        if (test_bit(In_sync, &rdev->flags)) {
                 len += sprintf(page+len, "%sin_sync",sep);
                 sep = ",";
         }
-        if (!rdev->faulty && !rdev->in_sync) {
+        if (!test_bit(Faulty, &rdev->flags) &&
+            !test_bit(In_sync, &rdev->flags)) {
                 len += sprintf(page+len, "%sspare", sep);
                 sep = ",";
         }
@@ -1578,8 +1577,7 @@ static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_mi
         kobject_init(&rdev->kobj);
 
         rdev->desc_nr = -1;
-        rdev->faulty = 0;
-        rdev->in_sync = 0;
+        rdev->flags = 0;
         rdev->data_offset = 0;
         atomic_set(&rdev->nr_pending, 0);
         atomic_set(&rdev->read_errors, 0);
@@ -1670,7 +1668,7 @@ static void analyze_sbs(mddev_t * mddev)
                 if (mddev->level == LEVEL_MULTIPATH) {
                         rdev->desc_nr = i++;
                         rdev->raid_disk = rdev->desc_nr;
-                        rdev->in_sync = 1;
+                        set_bit(In_sync, &rdev->flags);
                 }
         }
 
@@ -1939,7 +1937,7 @@ static int do_md_run(mddev_t * mddev)
 
                 /* devices must have minimum size of one chunk */
                 ITERATE_RDEV(mddev,rdev,tmp) {
-                        if (rdev->faulty)
+                        if (test_bit(Faulty, &rdev->flags))
                                 continue;
                         if (rdev->size < chunk_size / 1024) {
                                 printk(KERN_WARNING
@@ -1967,7 +1965,7 @@ static int do_md_run(mddev_t * mddev)
          * Also find largest hardsector size
          */
         ITERATE_RDEV(mddev,rdev,tmp) {
-                if (rdev->faulty)
+                if (test_bit(Faulty, &rdev->flags))
                         continue;
                 sync_blockdev(rdev->bdev);
                 invalidate_bdev(rdev->bdev, 0);
@@ -2304,7 +2302,7 @@ static int autostart_array(dev_t startdev)
                 return err;
         }
 
-        if (start_rdev->faulty) {
+        if (test_bit(Faulty, &start_rdev->flags)) {
                 printk(KERN_WARNING 
                         "md: can not autostart based on faulty %s!\n",
                         bdevname(start_rdev->bdev,b));
@@ -2363,11 +2361,11 @@ static int get_array_info(mddev_t * mddev, void __user * arg)
         nr=working=active=failed=spare=0;
         ITERATE_RDEV(mddev,rdev,tmp) {
                 nr++;
-                if (rdev->faulty)
+                if (test_bit(Faulty, &rdev->flags))
                         failed++;
                 else {
                         working++;
-                        if (rdev->in_sync)
+                        if (test_bit(In_sync, &rdev->flags))
                                 active++;       
                         else
                                 spare++;
@@ -2458,9 +2456,9 @@ static int get_disk_info(mddev_t * mddev, void __user * arg)
                 info.minor = MINOR(rdev->bdev->bd_dev);
                 info.raid_disk = rdev->raid_disk;
                 info.state = 0;
-                if (rdev->faulty)
+                if (test_bit(Faulty, &rdev->flags))
                         info.state |= (1<<MD_DISK_FAULTY);
-                else if (rdev->in_sync) {
+                else if (test_bit(In_sync, &rdev->flags)) {
                         info.state |= (1<<MD_DISK_ACTIVE);
                         info.state |= (1<<MD_DISK_SYNC);
                 }
@@ -2553,7 +2551,7 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
                                 validate_super(mddev, rdev);
                 rdev->saved_raid_disk = rdev->raid_disk;
 
-                rdev->in_sync = 0; /* just to be sure */
+                clear_bit(In_sync, &rdev->flags); /* just to be sure */
                 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
                         set_bit(WriteMostly, &rdev->flags);
 
@@ -2591,11 +2589,11 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
                 else
                         rdev->raid_disk = -1;
 
-                rdev->faulty = 0;
+                rdev->flags = 0;
+
                 if (rdev->raid_disk < mddev->raid_disks)
-                        rdev->in_sync = (info->state & (1<<MD_DISK_SYNC));
-                else
-                        rdev->in_sync = 0;
+                        if (info->state & (1<<MD_DISK_SYNC))
+                                set_bit(In_sync, &rdev->flags);
 
                 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
                         set_bit(WriteMostly, &rdev->flags);
@@ -2694,14 +2692,14 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev)
                 goto abort_export;
         }
 
-        if (rdev->faulty) {
+        if (test_bit(Faulty, &rdev->flags)) {
                 printk(KERN_WARNING 
                         "md: can not hot-add faulty %s disk to %s!\n",
                         bdevname(rdev->bdev,b), mdname(mddev));
                 err = -EINVAL;
                 goto abort_export;
         }
-        rdev->in_sync = 0;
+        clear_bit(In_sync, &rdev->flags);
         rdev->desc_nr = -1;
         bind_rdev_to_array(rdev, mddev);
 
@@ -3428,7 +3426,7 @@ void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
                 return;
         }
 
-        if (!rdev || rdev->faulty)
+        if (!rdev || test_bit(Faulty, &rdev->flags))
                 return;
 /*
         dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
@@ -3626,7 +3624,7 @@ static int md_seq_show(struct seq_file *seq, void *v)
                                 bdevname(rdev->bdev,b), rdev->desc_nr);
                         if (test_bit(WriteMostly, &rdev->flags))
                                 seq_printf(seq, "(W)");
-                        if (rdev->faulty) {
+                        if (test_bit(Faulty, &rdev->flags)) {
                                 seq_printf(seq, "(F)");
                                 continue;
                         } else if (rdev->raid_disk < 0)
@@ -4174,7 +4172,7 @@ void md_check_recovery(mddev_t *mddev)
                  */
                 ITERATE_RDEV(mddev,rdev,rtmp)
                         if (rdev->raid_disk >= 0 &&
-                            (rdev->faulty || ! rdev->in_sync) &&
+                            (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
                             atomic_read(&rdev->nr_pending)==0) {
                                 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
                                         char nm[20];
@@ -4187,7 +4185,7 @@ void md_check_recovery(mddev_t *mddev)
                 if (mddev->degraded) {
                         ITERATE_RDEV(mddev,rdev,rtmp)
                                 if (rdev->raid_disk < 0
-                                    && !rdev->faulty) {
+                                    && !test_bit(Faulty, &rdev->flags)) {
                                         if (mddev->pers->hot_add_disk(mddev,rdev)) {
                                                 char nm[20];
                                                 sprintf(nm, "rd%d", rdev->raid_disk);
@@ -4347,7 +4345,7 @@ static void autostart_arrays(int part)
                 if (IS_ERR(rdev))
                         continue;
 
-                if (rdev->faulty) {
+                if (test_bit(Faulty, &rdev->flags)) {
                         MD_BUG();
                         continue;
                 }