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Subject[Patch 1/4] fs.h: b_journal_head
Add a new member to struct buffer_head called b_journal_head.  This is
for jbd to use, rather than have it peeking at b_private for in flight
ios.
--- diff/fs/buffer.c 2003-12-09 10:25:27.000000000 +0000
+++ source/fs/buffer.c 2003-12-09 10:32:41.000000000 +0000
@@ -763,6 +763,7 @@
bh->b_list = BUF_CLEAN;
bh->b_end_io = handler;
bh->b_private = private;
+ bh->b_journal_head = NULL;
}

static void end_buffer_io_async(struct buffer_head * bh, int uptodate)
--- diff/fs/jbd/journal.c 2003-12-09 10:25:27.000000000 +0000
+++ source/fs/jbd/journal.c 2003-12-09 10:32:41.000000000 +0000
@@ -1802,9 +1802,9 @@

if (buffer_jbd(bh)) {
/* Someone did it for us! */
- J_ASSERT_BH(bh, bh->b_private != NULL);
+ J_ASSERT_BH(bh, bh->b_journal_head != NULL);
journal_free_journal_head(jh);
- jh = bh->b_private;
+ jh = bh->b_journal_head;
} else {
/*
* We actually don't need jh_splice_lock when
@@ -1812,7 +1812,7 @@
*/
spin_lock(&jh_splice_lock);
set_bit(BH_JBD, &bh->b_state);
- bh->b_private = jh;
+ bh->b_journal_head = jh;
jh->b_bh = bh;
atomic_inc(&bh->b_count);
spin_unlock(&jh_splice_lock);
@@ -1821,7 +1821,7 @@
}
jh->b_jcount++;
spin_unlock(&journal_datalist_lock);
- return bh->b_private;
+ return bh->b_journal_head;
}

/*
@@ -1854,7 +1854,7 @@
J_ASSERT_BH(bh, jh2bh(jh) == bh);
BUFFER_TRACE(bh, "remove journal_head");
spin_lock(&jh_splice_lock);
- bh->b_private = NULL;
+ bh->b_journal_head = NULL;
jh->b_bh = NULL; /* debug, really */
clear_bit(BH_JBD, &bh->b_state);
__brelse(bh);
--- diff/include/linux/fs.h 2003-12-09 10:25:27.000000000 +0000
+++ source/include/linux/fs.h 2003-12-09 10:32:41.000000000 +0000
@@ -265,7 +265,7 @@
struct page *b_page; /* the page this bh is mapped to */
void (*b_end_io)(struct buffer_head *bh, int uptodate); /* I/O completion */
void *b_private; /* reserved for b_end_io */
-
+ void *b_journal_head; /* ext3 journal_heads */
unsigned long b_rsector; /* Real buffer location on disk */
wait_queue_head_t b_wait;

--- diff/include/linux/jbd.h 2003-06-16 09:56:12.000000000 +0100
+++ source/include/linux/jbd.h 2003-12-09 10:32:41.000000000 +0000
@@ -311,7 +311,7 @@

static inline struct journal_head *bh2jh(struct buffer_head *bh)
{
- return bh->b_private;
+ return bh->b_journal_head;
}

#define HAVE_JOURNAL_CALLBACK_STATUS
-
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