On May 15, 2017, at 11:07, Davidlohr Bueso <d...@stgolabs.net> wrote:
>
> This replaces the in-house version, which is also derived
> from Jan's interval tree implementation.
>
> Cc: oleg.dro...@intel.com
> Cc: andreas.dil...@intel.com
> Cc: jsimm...@infradead.org
> Cc: lustre-de...@lists.lustre.org
> Signed-off-by: Davidlohr Bueso <dbu...@suse.de>
Repeating my request that the whole patch series should be CC'd to the
linux-fsdevel list,
since I only got this last patch and this makes it difficult to review the
whole series.
> ---
> diff --git a/drivers/staging/lustre/lustre/llite/file.c
> b/drivers/staging/lustre/lustre/llite/file.c
> index 67c4b9cc6e75..bd020bdaf85d 100644
> --- a/drivers/staging/lustre/lustre/llite/file.c
> +++ b/drivers/staging/lustre/lustre/llite/file.c
> @@ -1083,10 +1083,10 @@ ll_file_io_generic(const struct lu_env *env, struct
> vvp_io_args *args,
> if (((iot == CIT_WRITE) ||
> (iot == CIT_READ && (file->f_flags & O_DIRECT))) &&
> !(vio->vui_fd->fd_flags & LL_FILE_GROUP_LOCKED)) {
> - CDEBUG(D_VFSTRACE, "Range lock [%llu, %llu]\n",
> - range.rl_node.in_extent.start,
> - range.rl_node.in_extent.end);
> - rc = range_lock(&lli->lli_write_tree, &range);
> + CDEBUG(D_VFSTRACE, "Range lock [%lu, %lu]\n",
> + range.node.start,
> + range.node.last);
> + rc =
> range_write_lock_interruptible(&lli->lli_write_tree, &range);
> if (rc < 0)
> goto out;
>
> @@ -1096,10 +1096,10 @@ ll_file_io_generic(const struct lu_env *env, struct
> vvp_io_args *args,
> rc = cl_io_loop(env, io);
> ll_cl_remove(file, env);
> if (range_locked) {
> - CDEBUG(D_VFSTRACE, "Range unlock [%llu, %llu]\n",
> - range.rl_node.in_extent.start,
> - range.rl_node.in_extent.end);
> - range_unlock(&lli->lli_write_tree, &range);
> + CDEBUG(D_VFSTRACE, "Range unlock [%lu, %lu]\n",
> + range.node.start,
> + range.node.last);
> + range_write_unlock(&lli->lli_write_tree, &range);
> }
> } else {
> /* cl_io_rw_init() handled IO */
I'm not against this patch, but it does expose an implementation difference
between the
Lustre version of this code and the in-tree version. Preferred kernel coding
style is to
have a struct-unique prefix for struct members (e.g. using "rl_" for struct
range_lock,
using "in_" for struct interval_tree_node). That allows tags to work properly,
instead
of trying to locate generic struct names like "start", "node" etc.
In an unexpected twist of fate, the Lustre version of this code is following
preferred
coding style and the in-tree (interval_tree) and submitted (range_rwlock) code
does not.
Cheers, Andreas
