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-rw-r--r--drivers/md/bitmap.c7
-rw-r--r--drivers/md/bitmap.h4
2 files changed, 10 insertions, 1 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 8f681da00277..15dbe03117e4 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -423,6 +423,8 @@ void bitmap_update_sb(struct bitmap *bitmap)
/* This might have been changed by a reshape */
sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize);
+ sb->sectors_reserved = cpu_to_le32(bitmap->mddev->
+ bitmap_info.space);
kunmap_atomic(sb);
write_page(bitmap, bitmap->storage.sb_page, 1);
}
@@ -536,6 +538,7 @@ static int bitmap_read_sb(struct bitmap *bitmap)
bitmap_super_t *sb;
unsigned long chunksize, daemon_sleep, write_behind;
unsigned long long events;
+ unsigned long sectors_reserved = 0;
int err = -EINVAL;
struct page *sb_page;
@@ -573,6 +576,7 @@ static int bitmap_read_sb(struct bitmap *bitmap)
chunksize = le32_to_cpu(sb->chunksize);
daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ;
write_behind = le32_to_cpu(sb->write_behind);
+ sectors_reserved = le32_to_cpu(sb->sectors_reserved);
/* verify that the bitmap-specific fields are valid */
if (sb->magic != cpu_to_le32(BITMAP_MAGIC))
@@ -633,6 +637,9 @@ out_no_sb:
bitmap->mddev->bitmap_info.chunksize = chunksize;
bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
bitmap->mddev->bitmap_info.max_write_behind = write_behind;
+ if (bitmap->mddev->bitmap_info.space == 0 ||
+ bitmap->mddev->bitmap_info.space > sectors_reserved)
+ bitmap->mddev->bitmap_info.space = sectors_reserved;
if (err)
bitmap_print_sb(bitmap);
return err;
diff --git a/drivers/md/bitmap.h b/drivers/md/bitmap.h
index 04dcde3871be..df4aeb6ac6f0 100644
--- a/drivers/md/bitmap.h
+++ b/drivers/md/bitmap.h
@@ -128,8 +128,10 @@ typedef struct bitmap_super_s {
__le32 chunksize; /* 52 the bitmap chunk size in bytes */
__le32 daemon_sleep; /* 56 seconds between disk flushes */
__le32 write_behind; /* 60 number of outstanding write-behind writes */
+ __le32 sectors_reserved; /* 64 number of 512-byte sectors that are
+ * reserved for the bitmap. */
- __u8 pad[256 - 64]; /* set to zero */
+ __u8 pad[256 - 68]; /* set to zero */
} bitmap_super_t;
/* notes: