[PATCH 1/5] jbd: strictly check for write errors on data buffers

Hidehiro Kawai
2008-06-02T10:44:22Z

Subject: [PATCH 1/5] jbd: strictly check for write errors on data buffers

In ordered mode, we should abort journaling when an I/O error has
occurred on a file data buffer in the committing transaction. But
there can be data buffers which are not checked for error:

(a) the buffer which has already been written out by pdflush
(b) the buffer which has been unlocked before scanned in the
t_locked_list loop

This patch adds missing error checks and aborts journaling
appropriately.

Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitacih.com>
Acked-by: Jan Kara <jack@suse.cz>
---
fs/jbd/commit.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)

Index: linux-2.6.26-rc4/fs/jbd/commit.c
===================================================================
--- linux-2.6.26-rc4.orig/fs/jbd/commit.c
+++ linux-2.6.26-rc4/fs/jbd/commit.c
@@ -172,7 +172,7 @@ static void journal_do_submit_data(struc
/*
* Submit all the data buffers to disk
*/
-static void journal_submit_data_buffers(journal_t *journal,
+static int journal_submit_data_buffers(journal_t *journal,
transaction_t *commit_transaction)
{
struct journal_head *jh;
@@ -180,6 +180,7 @@ static void journal_submit_data_buffers(
int locked;
int bufs = 0;
struct buffer_head **wbuf = journal->j_wbuf;
+ int err = 0;

/*
* Whenever we unlock the journal and sleep, things can get added
@@ -253,6 +254,8 @@ write_out_data:
put_bh(bh);
} else {
BUFFER_TRACE(bh, "writeout complete: unfile");
+ if (unlikely(!buffer_uptodate(bh)))
+ err = -EIO;
__journal_unfile_buffer(jh);
jbd_unlock_bh_state(bh);
if (locked)
@@ -271,6 +274,8 @@ write_out_data:
}
spin_unlock(&journal->j_list_lock);
journal_do_submit_data(wbuf, bufs);
+
+ return err;
}

/*
@@ -410,8 +415,7 @@ void journal_commit_transaction(journal_
* Now start flushing things to disk, in the order they appear
* on the transaction lists. Data blocks go first.
*/
- err = 0;
- journal_submit_data_buffers(journal, commit_transaction);
+ err = journal_submit_data_buffers(journal, commit_transaction);

/*
* Wait for all previously submitted IO to complete.
@@ -426,10 +430,10 @@ void journal_commit_transaction(journal_
if (buffer_locked(bh)) {
spin_unlock(&journal->j_list_lock);
wait_on_buffer(bh);
- if (unlikely(!buffer_uptodate(bh)))
- err = -EIO;
spin_lock(&journal->j_list_lock);
}
+ if (unlikely(!buffer_uptodate(bh)))
+ err = -EIO;
if (!inverted_lock(journal, bh)) {
put_bh(bh);
spin_lock(&journal->j_list_lock);