diff options
| author | Yasunori Goto <y-goto@jp.fujitsu.com> | 2009-02-17 10:32:23 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-02-20 14:40:23 -0800 |
| commit | b823aa0a9c93ba5cbd005c06388d4e61e2a815d9 (patch) | |
| tree | 9b0425925a125f598d2a1fc39092970ddf942928 | |
| parent | 5a7330c4bf35a4943e0ee0a1ad3373f8ce99654a (diff) | |
| download | lwn-b823aa0a9c93ba5cbd005c06388d4e61e2a815d9.tar.gz lwn-b823aa0a9c93ba5cbd005c06388d4e61e2a815d9.zip | |
ext4: Widen type of ext4_sb_info.s_mb_maxs[]
(cherry picked from commit ff7ef329b268b603ea4a2303241ef1c3829fd574)
I chased the cause of following ext4 oops report which is tested on
ia64 box.
http://bugzilla.kernel.org/show_bug.cgi?id=12018
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>
| -rw-r--r-- | fs/ext4/ext4_sb.h | 3 | ||||
| -rw-r--r-- | fs/ext4/mballoc.c | 2 |
2 files changed, 4 insertions, 1 deletions
diff --git a/fs/ext4/ext4_sb.h b/fs/ext4/ext4_sb.h index 2f3b8b1ca592..f00f112edea1 100644 --- a/fs/ext4/ext4_sb.h +++ b/fs/ext4/ext4_sb.h @@ -102,7 +102,8 @@ struct ext4_sb_info { spinlock_t s_reserve_lock; 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; diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 444ad998f72e..7beab7141dd5 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2493,6 +2493,8 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery) if (sbi->s_mb_offsets == NULL) { 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) { kfree(sbi->s_mb_maxs); |