ext4: Init the complete page while building buddy cache

We need to init the complete page during buddy cache init
by setting the contents to '1'.  Otherwise we can see the
following errors after doing an online resize of the
filesystem:

EXT4-fs error (device sdb1): ext4_mb_mark_diskspace_used:
	Allocating block 1040385 in system zone of 127 group

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 0c7e247f714cca9121561954328944040edc9a60..fd2294de404c04f0b838d6e4aeba23c279cba2df 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -846,6 +846,8 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
 
        err = 0;
        first_block = page->index * blocks_per_page;
+       /* init the page  */
+       memset(page_address(page), 0xff, PAGE_CACHE_SIZE);
        for (i = 0; i < blocks_per_page; i++) {
                int group;
                struct ext4_group_info *grinfo;
@@ -872,7 +874,6 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
                        BUG_ON(incore == NULL);
                        mb_debug("put buddy for group %u in page %lu/%x\n",
                                group, page->index, i * blocksize);
-                       memset(data, 0xff, blocksize);
                        grinfo = ext4_get_group_info(sb, group);
                        grinfo->bb_fragments = 0;
                        memset(grinfo->bb_counters, 0,