Re: ext4: oops on boot with root fs needing recovery

From: Theodore Tso
Date: Thu Oct 16 2008 - 16:33:22 EST


On Thu, Oct 16, 2008 at 01:12:03PM -0700, Jeremy Fitzhardinge wrote:
> I had a crash and rebooted. The root filesystem needed journal
> recovery, but ext4 crashed.
>
> My root fs is ext3 (no extents), but I've been mounting it as ext4 to
> see how it turns out.

Yeah, known bug. I'll push a patch to Linus to fix this.

- Ted

ext4: Do mballoc init before doing filesystem recovery

From: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>

During filesystem recovery we may be doing a truncate
which expects some of the mballoc data structures to
be initialized. So do ext4_mb_init before recovery.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 0e661c5..6ca2146 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2441,6 +2441,21 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
"available.\n");
}

+ if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
+ printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
+ "requested data journaling mode\n");
+ clear_opt(sbi->s_mount_opt, DELALLOC);
+ } else if (test_opt(sb, DELALLOC))
+ printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
+
+ ext4_ext_init(sb);
+ err = ext4_mb_init(sb, needs_recovery);
+ if (err) {
+ printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
+ err);
+ goto failed_mount4;
+ }
+
/*
* akpm: core read_super() calls in here with the superblock locked.
* That deadlocks, because orphan cleanup needs to lock the superblock
@@ -2460,21 +2475,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
"writeback");

- if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
- printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
- "requested data journaling mode\n");
- clear_opt(sbi->s_mount_opt, DELALLOC);
- } else if (test_opt(sb, DELALLOC))
- printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
-
- ext4_ext_init(sb);
- err = ext4_mb_init(sb, needs_recovery);
- if (err) {
- printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
- err);
- goto failed_mount4;
- }
-
lock_kernel();
return 0;

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/