Merge branch 'omap-pool'

[linux-2.6-omap-h63xx.git] / drivers / md / bitmap.c

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 719943763391263c7a4ab98ad0201244ce1d3d62..f8a9f7ab2cb8ac71884b87fb512a281db3c86789 100644 (file)
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -16,6 +16,7 @@
  * wait if count gets too high, wake when it drops to half.
  */
 
+#include <linux/blkdev.h>
 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
@@ -26,8 +27,8 @@
 #include <linux/file.h>
 #include <linux/mount.h>
 #include <linux/buffer_head.h>
-#include <linux/raid/md.h>
-#include <linux/raid/bitmap.h>
+#include "md.h"
+#include "bitmap.h"
 
 /* debug macros */
 
@@ -111,9 +112,10 @@ static int bitmap_checkpage(struct bitmap *bitmap, unsigned long page, int creat
        unsigned char *mappage;
 
        if (page >= bitmap->pages) {
-               printk(KERN_ALERT
-                       "%s: invalid bitmap page request: %lu (> %lu)\n",
-                       bmname(bitmap), page, bitmap->pages-1);
+               /* This can happen if bitmap_start_sync goes beyond
+                * End-of-device while looking for a whole page.
+                * It is harmless.
+                */
                return -EINVAL;
        }
 
@@ -265,7 +267,6 @@ static mdk_rdev_t *next_active_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
        list_for_each_continue_rcu(pos, &mddev->disks) {
                rdev = list_entry(pos, mdk_rdev_t, same_set);
                if (rdev->raid_disk >= 0 &&
-                   test_bit(In_sync, &rdev->flags) &&
                    !test_bit(Faulty, &rdev->flags)) {
                        /* this is a usable devices */
                        atomic_inc(&rdev->nr_pending);
@@ -297,7 +298,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
                                    + size/512 > 0)
                                        /* bitmap runs in to metadata */
                                        goto bad_alignment;
-                               if (rdev->data_offset + mddev->size*2
+                               if (rdev->data_offset + mddev->dev_sectors
                                    > rdev->sb_start + bitmap->offset)
                                        /* data runs in to bitmap */
                                        goto bad_alignment;
@@ -570,7 +571,7 @@ static int bitmap_read_sb(struct bitmap *bitmap)
        else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO ||
                 le32_to_cpu(sb->version) > BITMAP_MAJOR_HI)
                reason = "unrecognized superblock version";
-       else if (chunksize < PAGE_SIZE)
+       else if (chunksize < 512)
                reason = "bitmap chunksize too small";
        else if ((1 << ffz(~chunksize)) != chunksize)
                reason = "bitmap chunksize not a power of 2";
@@ -1306,6 +1307,9 @@ void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long secto
                PRINTK(KERN_DEBUG "dec write-behind count %d/%d\n",
                  atomic_read(&bitmap->behind_writes), bitmap->max_write_behind);
        }
+       if (bitmap->mddev->degraded)
+               /* Never clear bits or update events_cleared when degraded */
+               success = 0;
 
        while (sectors) {
                int blocks;
@@ -1345,8 +1349,8 @@ void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long secto
        }
 }
 
-int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks,
-                       int degraded)
+static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks,
+                              int degraded)
 {
        bitmap_counter_t *bmc;
        int rv;
@@ -1374,6 +1378,29 @@ int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks,
        return rv;
 }
 
+int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks,
+                     int degraded)
+{
+       /* bitmap_start_sync must always report on multiples of whole
+        * pages, otherwise resync (which is very PAGE_SIZE based) will
+        * get confused.
+        * So call __bitmap_start_sync repeatedly (if needed) until
+        * At least PAGE_SIZE>>9 blocks are covered.
+        * Return the 'or' of the result.
+        */
+       int rv = 0;
+       int blocks1;
+
+       *blocks = 0;
+       while (*blocks < (PAGE_SIZE>>9)) {
+               rv |= __bitmap_start_sync(bitmap, offset,
+                                         &blocks1, degraded);
+               offset += blocks1;
+               *blocks += blocks1;
+       }
+       return rv;
+}
+
 void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int aborted)
 {
        bitmap_counter_t *bmc;
@@ -1443,6 +1470,8 @@ void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector)
        wait_event(bitmap->mddev->recovery_wait,
                   atomic_read(&bitmap->mddev->recovery_active) == 0);
 
+       bitmap->mddev->curr_resync_completed = bitmap->mddev->curr_resync;
+       set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags);
        sector &= ~((1ULL << CHUNK_BLOCK_SHIFT(bitmap)) - 1);
        s = 0;
        while (s < sector && s < bitmap->mddev->resync_max_sectors) {