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    Subject[PATCH 1/2] locks: let the caller free file_lock on ->setlease failure
    The caller allocated it, the caller should free it.  The only issue so
    far is that we could change the flp pointer even on an error return if
    the fl_change callback failed. But we can simply move the flp assignment
    after the fl_change invocation, as the callers don't care about the
    flp return value if the setlease call failed.

    Signed-off-by: Christoph Hellwig <hch@lst.de>

    Index: linux-2.6/fs/cifs/cifsfs.c
    ===================================================================
    --- linux-2.6.orig/fs/cifs/cifsfs.c 2010-10-31 07:10:07.636004223 -0400
    +++ linux-2.6/fs/cifs/cifsfs.c 2010-10-31 07:10:10.922004154 -0400
    @@ -625,11 +625,8 @@ static int cifs_setlease(struct file *fi
    knows that the file won't be changed on the server
    by anyone else */
    return generic_setlease(file, arg, lease);
    - else {
    - if (arg != F_UNLCK)
    - locks_free_lock(*lease);
    + else
    return -EAGAIN;
    - }
    }

    struct file_system_type cifs_fs_type = {
    Index: linux-2.6/fs/gfs2/file.c
    ===================================================================
    --- linux-2.6.orig/fs/gfs2/file.c 2010-10-31 07:10:07.643004363 -0400
    +++ linux-2.6/fs/gfs2/file.c 2010-10-31 07:10:10.923003665 -0400
    @@ -629,8 +629,6 @@ static ssize_t gfs2_file_aio_write(struc

    static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
    {
    - if (arg != F_UNLCK)
    - locks_free_lock(*fl);
    return -EINVAL;
    }

    Index: linux-2.6/fs/locks.c
    ===================================================================
    --- linux-2.6.orig/fs/locks.c 2010-10-31 07:10:07.649004084 -0400
    +++ linux-2.6/fs/locks.c 2010-10-31 07:34:10.102255587 -0400
    @@ -1428,8 +1425,9 @@ int generic_setlease(struct file *filp,
    goto out;

    if (my_before != NULL) {
    - *flp = *my_before;
    error = lease->fl_lmops->fl_change(my_before, arg);
    + if (!error)
    + *flp = *my_before;
    goto out;
    }

    @@ -1444,8 +1442,6 @@ int generic_setlease(struct file *filp,
    return 0;

    out:
    - if (arg != F_UNLCK)
    - locks_free_lock(lease);
    return error;
    }
    EXPORT_SYMBOL(generic_setlease);
    @@ -1524,8 +1520,11 @@ static int do_fcntl_add_lease(unsigned i
    }
    lock_flocks();
    error = __vfs_setlease(filp, arg, &fl);
    - if (error)
    - goto out_unlock;
    + if (error) {
    + unlock_flocks();
    + locks_free_lock(fl);
    + goto out_free_fasync;
    + }

    /*
    * fasync_insert_entry() returns the old entry if any.
    @@ -1541,12 +1540,12 @@ static int do_fcntl_add_lease(unsigned i
    fl->fl_type = F_UNLCK | F_INPROGRESS;
    fl->fl_break_time = jiffies - 10;
    time_out_leases(inode);
    - goto out_unlock;
    + } else {
    + error = __f_setown(filp, task_pid(current), PIDTYPE_PID, 0);
    }
    -
    - error = __f_setown(filp, task_pid(current), PIDTYPE_PID, 0);
    -out_unlock:
    unlock_flocks();
    +
    +out_free_fasync:
    if (new)
    fasync_free(new);
    return error;
    Index: linux-2.6/fs/nfs/file.c
    ===================================================================
    --- linux-2.6.orig/fs/nfs/file.c 2010-10-31 07:10:07.658003804 -0400
    +++ linux-2.6/fs/nfs/file.c 2010-10-31 07:10:10.936003734 -0400
    @@ -884,7 +884,5 @@ static int nfs_setlease(struct file *fil
    dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
    file->f_path.dentry->d_parent->d_name.name,
    file->f_path.dentry->d_name.name, arg);
    - if (arg != F_UNLCK)
    - locks_free_lock(*fl);
    return -EINVAL;
    }
    Index: linux-2.6/fs/nfsd/nfs4state.c
    ===================================================================
    --- linux-2.6.orig/fs/nfsd/nfs4state.c 2010-10-31 07:10:07.666004084 -0400
    +++ linux-2.6/fs/nfsd/nfs4state.c 2010-10-31 07:32:56.906254608 -0400
    @@ -2652,6 +2652,7 @@ nfs4_open_delegation(struct svc_fh *fh,
    if ((status = vfs_setlease(fl->fl_file, fl->fl_type, &fl))) {
    dprintk("NFSD: setlease failed [%d], no delegation\n", status);
    dp->dl_flock = NULL;
    + locks_free_lock(fl);
    unhash_delegation(dp);
    flag = NFS4_OPEN_DELEGATE_NONE;
    goto out;

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