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[-V3] ext4: Init the complete page while building buddy cache

Message ID 1228198262-23984-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com
State Accepted, archived
Headers show

Commit Message

Aneesh Kumar K.V Dec. 2, 2008, 6:11 a.m. UTC 
We need to init the complete page during buddy cache init
by setting the contents to '1'. This ensures that during
resize when we increment the s_groups_count we don't hit
the erros as below.

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

V3 changes:
We don't need to do a memset when updating buddy cache since
we do a complete init of the page.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 fs/ext4/mballoc.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
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Patch

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 8f33691..0ecc7c7 100644
--- 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,