These are a few places I've found in jbd that look like they
may not be 16T-safe, or consistent with the use of unsigned
longs for block containers.
(well, some of these have come from the ext4 work on jbd
as well - although I think some of the ext4/jbd2 modifications
may not be needed, see my earlier messages today).
I think there's one more possibility that the wrap()
function may not be safe IF your last block in the journal
butts right up against the 2^32 block boundary, but that seems
like a VERY remote possibility, and I'm not worrying about it
at this point.
Comments? I'll send this upstream if it looks good.
Thanks,
-Eric
Signed-off-by: Eric Sandeen <esandeen@xxxxxxxxxx>
Index: linux-2.6.17-1.2654.el5/fs/jbd/journal.c
===================================================================
--- linux-2.6.17-1.2654.el5.orig/fs/jbd/journal.c
+++ linux-2.6.17-1.2654.el5/fs/jbd/journal.c
@@ -271,7 +271,7 @@ static void journal_kill_thread(journal_
int journal_write_metadata_buffer(transaction_t *transaction,
struct journal_head *jh_in,
struct journal_head **jh_out,
- int blocknr)
+ unsigned long blocknr)
{
int need_copy_out = 0;
int done_copy_out = 0;
@@ -696,7 +696,7 @@ fail:
* @bdev: Block device on which to create the journal
* @fs_dev: Device which hold journalled filesystem for this journal.
* @start: Block nr Start of journal.
- * @len: Lenght of the journal in blocks.
+ * @len: Length of the journal in blocks.
* @blocksize: blocksize of journalling device
* @returns: a newly created journal_t *
*
@@ -820,7 +820,7 @@ static void journal_fail_superblock (jou
static int journal_reset(journal_t *journal)
{
journal_superblock_t *sb = journal->j_superblock;
- unsigned int first, last;
+ unsigned long first, last;
first = be32_to_cpu(sb->s_first);
last = be32_to_cpu(sb->s_maxlen);
Index: linux-2.6.17-1.2654.el5/include/linux/jbd.h
===================================================================
--- linux-2.6.17-1.2654.el5.orig/include/linux/jbd.h
+++ linux-2.6.17-1.2654.el5/include/linux/jbd.h
@@ -732,7 +732,7 @@ struct journal_s
*/
struct block_device *j_dev;
int j_blocksize;
- unsigned int j_blk_offset;
+ unsigned long j_blk_offset;
/*
* Device which holds the client fs. For internal journal this will be
@@ -866,7 +866,7 @@ extern int
journal_write_metadata_buffer(transaction_t *transaction,
struct journal_head *jh_in,
struct journal_head **jh_out,
- int blocknr);
+ unsigned long blocknr);
/* Transaction locking */
extern void __wait_on_journal (journal_t *);
-
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