[PATCH] md: remove inappropriate limits in md/bitmap configuration.

The kernel should not be imposing these policy limits: The time between
bitmap updates should certainly be allowed to be more than 15 seconds, and
if someone wants a bitmap chunk size in excess of 4MB, the kernel isn't the
place to stop them.

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

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 519b1bf..abe415f 100644 (file)
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -485,12 +485,12 @@ 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 < 512 || chunksize > (1024 * 1024 * 4))
-               reason = "bitmap chunksize out of range (512B - 4MB)";
+       else if (chunksize < PAGE_SIZE)
+               reason = "bitmap chunksize too small";
        else if ((1 << ffz(~chunksize)) != chunksize)
                reason = "bitmap chunksize not a power of 2";
-       else if (daemon_sleep < 1 || daemon_sleep > 15)
-               reason = "daemon sleep period out of range (1-15s)";
+       else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT / HZ)
+               reason = "daemon sleep period out of range";
        else if (write_behind > COUNTER_MAX)
                reason = "write-behind limit out of range (0 - 16383)";
        if (reason) {