diff mbox

[17/36] ext4: Widen type of ext4_sb_info.s_mb_maxs[]

Message ID 20090218222928.GR10668@kroah.com
State Not Applicable, archived
Headers show

Commit Message

gregkh@suse.de Feb. 18, 2009, 10:29 p.m. UTC
2.6.27-stable review patch.  If anyone has any objections, please let us know.


From: Yasunori Goto <y-goto@jp.fujitsu.com>

(cherry picked from commit ff7ef329b268b603ea4a2303241ef1c3829fd574)

I chased the cause of following ext4 oops report which is tested on
ia64 box.


The cause is the size of s_mb_maxs array that is defined as "unsigned
short" in ext4_sb_info structure.  If the file system's block size is
8k or greater, an unsigned short is not wide enough to contain the
value fs->blocksize << 3.

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

 fs/ext4/ext4_sb.h |    3 ++-
 fs/ext4/mballoc.c |    2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

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diff mbox


--- a/fs/ext4/ext4_sb.h
+++ b/fs/ext4/ext4_sb.h
@@ -103,7 +103,8 @@  struct ext4_sb_info {
 	struct list_head s_committed_transaction;
 	spinlock_t s_md_lock;
 	tid_t s_last_transaction;
-	unsigned short *s_mb_offsets, *s_mb_maxs;
+	unsigned short *s_mb_offsets;
+	unsigned int *s_mb_maxs;
 	/* tunables */
 	unsigned long s_stripe;
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2495,6 +2495,8 @@  int ext4_mb_init(struct super_block *sb,
 		clear_opt(sbi->s_mount_opt, MBALLOC);
 		return -ENOMEM;
+	i = (sb->s_blocksize_bits + 2) * sizeof(unsigned int);
 	sbi->s_mb_maxs = kmalloc(i, GFP_KERNEL);
 	if (sbi->s_mb_maxs == NULL) {
 		clear_opt(sbi->s_mount_opt, MBALLOC);