This is a note to let you know that I've just added the patch titled
Btrfs: delete inline extents when we find them during logging
to the 3.8-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:
btrfs-delete-inline-extents-when-we-find-them-during-logging.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 124fe663f93162d17b7e391705cac122101e93d8 Mon Sep 17 00:00:00 2001
From: Josef Bacik <jbacik@xxxxxxxxxxxx>
Date: Fri, 1 Mar 2013 11:47:21 -0500
Subject: Btrfs: delete inline extents when we find them during logging
From: Josef Bacik <jbacik@xxxxxxxxxxxx>
commit 124fe663f93162d17b7e391705cac122101e93d8 upstream.
Apparently when we do inline extents we allow the data to overlap the last chunk
of the btrfs_file_extent_item, which means that we can possibly have a
btrfs_file_extent_item that isn't actually as large as a btrfs_file_extent_item.
This messes with us when we try to overwrite the extent when logging new extents
since we expect for it to be the right size. To fix this just delete the item
and try to do the insert again which will give us the proper sized
btrfs_file_extent_item. This fixes a panic where map_private_extent_buffer
would blow up because we're trying to write past the end of the leaf. Thanks,
Signed-off-by: Josef Bacik <jbacik@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/tree-log.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -3281,6 +3281,7 @@ static int log_one_extent(struct btrfs_t
int ret;
bool skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
+insert:
INIT_LIST_HEAD(&ordered_sums);
btrfs_init_map_token(&token);
key.objectid = btrfs_ino(inode);
@@ -3296,6 +3297,23 @@ static int log_one_extent(struct btrfs_t
leaf = path->nodes[0];
fi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
+
+ /*
+ * If we are overwriting an inline extent with a real one then we need
+ * to just delete the inline extent as it may not be large enough to
+ * have the entire file_extent_item.
+ */
+ if (ret && btrfs_token_file_extent_type(leaf, fi, &token) ==
+ BTRFS_FILE_EXTENT_INLINE) {
+ ret = btrfs_del_item(trans, log, path);
+ btrfs_release_path(path);
+ if (ret) {
+ path->really_keep_locks = 0;
+ return ret;
+ }
+ goto insert;
+ }
+
btrfs_set_token_file_extent_generation(leaf, fi, em->generation,
&token);
if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) {
Patches currently in stable-queue which might be from jbacik@xxxxxxxxxxxx are
queue-3.8/btrfs-copy-everything-if-we-ve-created-an-inline-extent.patch
queue-3.8/btrfs-delete-inline-extents-when-we-find-them-during-logging.patch
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