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btrfs: Deprecate userspace transaction ioctls

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Userspace transactions were introduced in commit 6bf13c0cc8 ("Btrfs:
transaction ioctls") to provide semantics that Ceph's object store
required. However, things have changed significantly since then, to the
point where btrfs is no longer suitable as a backend for ceph and in
fact it's actively advised against such usages. Considering this, there
doesn't seem to be a widespread, legit use case of userspace
transaction. They also clutter the file->private pointer.

So to end the agony let's nuke the userspace transaction ioctls. As a
first step let's give time for people to voice their objection by just
WARN()ining when the userspace transaction is used.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ move the warning past perm checks, keep the has-been-printed state;
  we're ok with just one warning over all filesystems ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2017-07-26 11:26:28 +03:00 committed by David Sterba
parent 9f6d251033
commit 3558d4f88e
1 changed files with 11 additions and 0 deletions
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11
fs/btrfs/ioctl.c
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@ -3967,11 +3967,22 @@ static long btrfs_ioctl_trans_start(struct file *file)
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
int ret;
static bool warned = false;
ret = -EPERM;
if (!capable(CAP_SYS_ADMIN))
goto out;
if (!warned) {
btrfs_warn(fs_info,
"Userspace transaction mechanism is considered "
"deprecated and slated to be removed in 4.17. "
"If you have a valid use case please "
"speak up on the mailing list");
WARN_ON(1);
warned = true;
}
ret = -EINPROGRESS;
if (file->private_data)
goto out;