From: Arne Jansen <sensille@gmx.net>
To: chris.mason@oracle.com, linux-btrfs@vger.kernel.org
Subject: [PATCH] btrfs: scrub: errors in tree enumeration
Date: Fri, 3 Jun 2011 11:28:05 +0200 [thread overview]
Message-ID: <1307093285-7966-1-git-send-email-sensille@gmx.net> (raw)
due to the semantics of btrfs_search_slot the path can point to an
invalid slot when ret > 0. This condition went unnoticed, which in
turn could have led to an incomplete scrubbing.
Signed-off-by: Arne Jansen <sensille@gmx.net>
---
fs/btrfs/scrub.c | 21 ++++++++++++---------
1 files changed, 12 insertions(+), 9 deletions(-)
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 2d1f890..3dff244 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -906,11 +906,7 @@ again:
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
-
- l = path->nodes[0];
- slot = path->slots[0];
- btrfs_item_key_to_cpu(l, &key, slot);
- if (key.objectid != logical) {
+ if (ret > 0) {
ret = btrfs_previous_item(root, path, 0,
BTRFS_EXTENT_ITEM_KEY);
if (ret < 0)
@@ -1063,7 +1059,15 @@ int scrub_enumerate_chunks(struct scrub_dev *sdev, u64 start, u64 end)
while (1) {
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
- goto out;
+ break;
+ if (ret > 0) {
+ if (path->slots[0] >=
+ btrfs_header_nritems(path->nodes[0])) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret)
+ break;
+ }
+ }
ret = 0;
l = path->nodes[0];
@@ -1074,7 +1078,7 @@ int scrub_enumerate_chunks(struct scrub_dev *sdev, u64 start, u64 end)
if (found_key.objectid != sdev->dev->devid)
break;
- if (btrfs_key_type(&key) != BTRFS_DEV_EXTENT_KEY)
+ if (btrfs_key_type(&found_key) != BTRFS_DEV_EXTENT_KEY)
break;
if (found_key.offset >= end)
@@ -1103,7 +1107,7 @@ int scrub_enumerate_chunks(struct scrub_dev *sdev, u64 start, u64 end)
cache = btrfs_lookup_block_group(fs_info, chunk_offset);
if (!cache) {
ret = -ENOENT;
- goto out;
+ break;
}
ret = scrub_chunk(sdev, chunk_tree, chunk_objectid,
chunk_offset, length);
@@ -1115,7 +1119,6 @@ int scrub_enumerate_chunks(struct scrub_dev *sdev, u64 start, u64 end)
btrfs_release_path(path);
}
-out:
btrfs_free_path(path);
return ret;
}
--
1.7.3.4
reply other threads:[~2011-06-03 9:28 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1307093285-7966-1-git-send-email-sensille@gmx.net \
--to=sensille@gmx.net \
--cc=chris.mason@oracle.com \
--cc=linux-btrfs@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.