This is a note to let you know that I've just added the patch titled
Revert "Btrfs: race free update of commit root for ro snapshots"
to the 3.17-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:
revert-btrfs-race-free-update-of-commit-root-for-ro-snapshots.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d37973082b453ba6b89ec07eb7b84305895d35e1 Mon Sep 17 00:00:00 2001
From: Chris Mason <clm@xxxxxx>
Date: Wed, 15 Oct 2014 13:50:56 -0700
Subject: Revert "Btrfs: race free update of commit root for ro snapshots"
From: Chris Mason <clm@xxxxxx>
commit d37973082b453ba6b89ec07eb7b84305895d35e1 upstream.
This reverts commit 9c3b306e1c9e6be4be09e99a8fe2227d1005effc.
Switching only one commit root during a transaction is wrong because it
leads the fs into an inconsistent state. All commit roots should be
switched at once, at transaction commit time, otherwise backref walking
can often miss important references that were only accessible through
the old commit root. Plus, the root item for the snapshot's root wasn't
getting updated and preventing the next transaction commit to do it.
This made several users get into random corruption issues after creation
of readonly snapshots.
A regression test for xfstests will follow soon.
Cc: stable@xxxxxxxxxxxxxxx # 3.17
Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/inode.c | 36 ------------------------------------
fs/btrfs/ioctl.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 33 insertions(+), 36 deletions(-)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5203,42 +5203,6 @@ struct inode *btrfs_lookup_dentry(struct
iput(inode);
inode = ERR_PTR(ret);
}
- /*
- * If orphan cleanup did remove any orphans, it means the tree
- * was modified and therefore the commit root is not the same as
- * the current root anymore. This is a problem, because send
- * uses the commit root and therefore can see inode items that
- * don't exist in the current root anymore, and for example make
- * calls to btrfs_iget, which will do tree lookups based on the
- * current root and not on the commit root. Those lookups will
- * fail, returning a -ESTALE error, and making send fail with
- * that error. So make sure a send does not see any orphans we
- * have just removed, and that it will see the same inodes
- * regardless of whether a transaction commit happened before
- * it started (meaning that the commit root will be the same as
- * the current root) or not.
- */
- if (sub_root->node != sub_root->commit_root) {
- u64 sub_flags = btrfs_root_flags(&sub_root->root_item);
-
- if (sub_flags & BTRFS_ROOT_SUBVOL_RDONLY) {
- struct extent_buffer *eb;
-
- /*
- * Assert we can't have races between dentry
- * lookup called through the snapshot creation
- * ioctl and the VFS.
- */
- ASSERT(mutex_is_locked(&dir->i_mutex));
-
- down_write(&root->fs_info->commit_root_sem);
- eb = sub_root->commit_root;
- sub_root->commit_root =
- btrfs_root_node(sub_root);
- up_write(&root->fs_info->commit_root_sem);
- free_extent_buffer(eb);
- }
- }
}
return inode;
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -714,6 +714,39 @@ static int create_snapshot(struct btrfs_
if (ret)
goto fail;
+ ret = btrfs_orphan_cleanup(pending_snapshot->snap);
+ if (ret)
+ goto fail;
+
+ /*
+ * If orphan cleanup did remove any orphans, it means the tree was
+ * modified and therefore the commit root is not the same as the
+ * current root anymore. This is a problem, because send uses the
+ * commit root and therefore can see inode items that don't exist
+ * in the current root anymore, and for example make calls to
+ * btrfs_iget, which will do tree lookups based on the current root
+ * and not on the commit root. Those lookups will fail, returning a
+ * -ESTALE error, and making send fail with that error. So make sure
+ * a send does not see any orphans we have just removed, and that it
+ * will see the same inodes regardless of whether a transaction
+ * commit happened before it started (meaning that the commit root
+ * will be the same as the current root) or not.
+ */
+ if (readonly && pending_snapshot->snap->node !=
+ pending_snapshot->snap->commit_root) {
+ trans = btrfs_join_transaction(pending_snapshot->snap);
+ if (IS_ERR(trans) && PTR_ERR(trans) != -ENOENT) {
+ ret = PTR_ERR(trans);
+ goto fail;
+ }
+ if (!IS_ERR(trans)) {
+ ret = btrfs_commit_transaction(trans,
+ pending_snapshot->snap);
+ if (ret)
+ goto fail;
+ }
+ }
+
inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
if (IS_ERR(inode)) {
ret = PTR_ERR(inode);
Patches currently in stable-queue which might be from clm@xxxxxx are
queue-3.17/btrfs-fix-build_backref_tree-issue-with-multiple-shared-blocks.patch
queue-3.17/btrfs-add-missing-compression-property-remove-in-btrfs_ioctl_setflags.patch
queue-3.17/btrfs-fix-the-wrong-condition-judgment-about-subset-extent-map.patch
queue-3.17/btrfs-don-t-go-readonly-on-existing-qgroup-items.patch
queue-3.17/btrfs-try-not-to-enospc-on-log-replay.patch
queue-3.17/btrfs-don-t-do-async-reclaim-during-log-replay.patch
queue-3.17/revert-btrfs-race-free-update-of-commit-root-for-ro-snapshots.patch
queue-3.17/btrfs-wake-up-transaction-thread-from-sync_fs-ioctl.patch
queue-3.17/btrfs-fix-a-deadlock-in-btrfs_dev_replace_finishing.patch
queue-3.17/btrfs-fix-and-enhance-merge_extent_mapping-to-insert-best-fitted-extent-map.patch
queue-3.17/btrfs-cleanup-error-handling-in-build_backref_tree.patch
queue-3.17/btrfs-fix-up-bounds-checking-in-lseek.patch
queue-3.17/btrfs-fix-race-in-wait_sync-ioctl.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html