skge: default WOL should be magic only (rev2)

[powerpc.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 0c59b70..7428992 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -22,6 +22,7 @@
 #include <linux/mount.h>
 #include <linux/uio.h>
 #include <linux/namei.h>
+#include <linux/log2.h>
 #include <asm/uaccess.h>
 #include "internal.h"
 
@@ -55,17 +56,19 @@ static sector_t max_block(struct block_device *bdev)
        return retval;
 }
 
-/* Kill _all_ buffers, dirty or not.. */
+/* Kill _all_ buffers and pagecache , dirty or not.. */
 static void kill_bdev(struct block_device *bdev)
 {
-       invalidate_bdev(bdev, 1);
+       if (bdev->bd_inode->i_mapping->nrpages == 0)
+               return;
+       invalidate_bh_lrus();
        truncate_inode_pages(bdev->bd_inode->i_mapping, 0);
 }      
 
 int set_blocksize(struct block_device *bdev, int size)
 {
        /* Size must be a power of two, and between 512 and PAGE_SIZE */
-       if (size > PAGE_SIZE || size < 512 || (size & (size-1)))
+       if (size > PAGE_SIZE || size < 512 || !is_power_of_2(size))
                return -EINVAL;
 
        /* Size cannot be smaller than the size supported by the device */
@@ -455,9 +458,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
        struct bdev_inode *ei = (struct bdev_inode *) foo;
        struct block_device *bdev = &ei->bdev;
 
-       if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
-           SLAB_CTOR_CONSTRUCTOR)
-       {
+       if (flags & SLAB_CTOR_CONSTRUCTOR) {
                memset(bdev, 0, sizeof(*bdev));
                mutex_init(&bdev->bd_mutex);
                sema_init(&bdev->bd_mount_sem, 1);
@@ -1101,6 +1102,13 @@ static int __blkdev_get(struct block_device *bdev, mode_t mode, unsigned flags,
                        int for_part);
 static int __blkdev_put(struct block_device *bdev, int for_part);
 
+/*
+ * bd_mutex locking:
+ *
+ *  mutex_lock(part->bd_mutex)
+ *    mutex_lock_nested(whole->bd_mutex, 1)
+ */
+
 static int do_open(struct block_device *bdev, struct file *file, int for_part)
 {
        struct module *owner = NULL;
@@ -1471,7 +1479,7 @@ int __invalidate_device(struct block_device *bdev)
                res = invalidate_inodes(sb);
                drop_super(sb);
        }
-       invalidate_bdev(bdev, 0);
+       invalidate_bdev(bdev);
        return res;
 }
 EXPORT_SYMBOL(__invalidate_device);