This is a note to let you know that I've just added the patch titled
jbd2: don't BUG but return ENOSPC if a handle runs out of space
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
jbd2-don-t-bug-but-return-enospc-if-a-handle-runs-out-of-space.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f6c07cad081ba222d63623d913aafba5586c1d2c Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@xxxxxxx>
Date: Sun, 8 Dec 2013 21:12:59 -0500
Subject: jbd2: don't BUG but return ENOSPC if a handle runs out of space
From: Theodore Ts'o <tytso@xxxxxxx>
commit f6c07cad081ba222d63623d913aafba5586c1d2c upstream.
If a handle runs out of space, we currently stop the kernel with a BUG
in jbd2_journal_dirty_metadata(). This makes it hard to figure out
what might be going on. So return an error of ENOSPC, so we can let
the file system layer figure out what is going on, to make it more
likely we can get useful debugging information). This should make it
easier to debug problems such as the one which was reported by:
https://bugzilla.kernel.org/show_bug.cgi?id=44731
The only two callers of this function are ext4_handle_dirty_metadata()
and ocfs2_journal_dirty(). The ocfs2 function will trigger a
BUG_ON(), which means there will be no change in behavior. The ext4
function will call ext4_error_inode() which will print the useful
debugging information and then handle the situation using ext4's error
handling mechanisms (i.e., which might mean halting the kernel or
remounting the file system read-only).
Also, since both file systems already call WARN_ON(), drop the WARN_ON
from jbd2_journal_dirty_metadata() to avoid two stack traces from
being displayed.
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: ocfs2-devel@xxxxxxxxxxxxxx
Acked-by: Joel Becker <jlbec@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/jbd2/transaction.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1126,7 +1126,10 @@ int jbd2_journal_dirty_metadata(handle_t
* once a transaction -bzzz
*/
jh->b_modified = 1;
- J_ASSERT_JH(jh, handle->h_buffer_credits > 0);
+ if (handle->h_buffer_credits <= 0) {
+ ret = -ENOSPC;
+ goto out_unlock_bh;
+ }
handle->h_buffer_credits--;
}
@@ -1209,7 +1212,6 @@ out_unlock_bh:
jbd2_journal_put_journal_head(jh);
out:
JBUFFER_TRACE(jh, "exit");
- WARN_ON(ret); /* All errors are bugs, so dump the stack */
return ret;
}
Patches currently in stable-queue which might be from tytso@xxxxxxx are
queue-3.4/ext4-check-for-overlapping-extents-in-ext4_valid_extent_entries.patch
queue-3.4/jbd2-don-t-bug-but-return-enospc-if-a-handle-runs-out-of-space.patch
queue-3.4/ext4-fix-use-after-free-in-ext4_mb_new_blocks.patch
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