On Mon, Jun 04, 2018 at 09:26:06PM +0200, Goffredo Baroncelli wrote:
> Resend this patch because I am not sure that all received it.
It looks that #4 is a bit unfortunate for you and/or patch series... :-)))
> BR
> G.Baroncelli
>
>
> -------- Forwarded Message --------
> Subject: [PATCH 4/9] btrfs: Avoid a rescan for a device which was already not
> found.
> Date: Sun, 3 Jun 2018 20:53:43 +0200
> From: Goffredo Baroncelli <kreij...@gmail.com>
> To: grub-devel@gnu.org
> CC: Goffredo Baroncelli <kreij...@inwind.it>
>
> If a device is not found, record this failure by storing NULL in
> data->devices_attached[]. This way we avoid unnecessary devices rescan,
Hmmm... Could you point me out where this store happens below?
Daniel
> and speedup the reads in case of a degraded array.
>
> Signed-off-by: Goffredo Baroncelli <kreik...@inwind.it>
> ---
> grub-core/fs/btrfs.c | 19 +++++++++----------
> 1 file changed, 9 insertions(+), 10 deletions(-)
>
> diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
> index 9b3a22772..b64b692f8 100644
> --- a/grub-core/fs/btrfs.c
> +++ b/grub-core/fs/btrfs.c
> @@ -588,7 +588,7 @@ find_device_iter (const char *name, void *data)
> }
>
> static grub_device_t
> -find_device (struct grub_btrfs_data *data, grub_uint64_t id, int do_rescan)
> +find_device (struct grub_btrfs_data *data, grub_uint64_t id)
> {
> struct find_device_ctx ctx = {
> .data = data,
> @@ -600,12 +600,9 @@ find_device (struct grub_btrfs_data *data, grub_uint64_t
> id, int do_rescan)
> for (i = 0; i < data->n_devices_attached; i++)
> if (id == data->devices_attached[i].id)
> return data->devices_attached[i].dev;
> - if (do_rescan)
> - grub_device_iterate (find_device_iter, &ctx);
> - if (!ctx.dev_found)
> - {
> - return NULL;
> - }
> +
> + grub_device_iterate (find_device_iter, &ctx);
> +
> data->n_devices_attached++;
> if (data->n_devices_attached > data->n_devices_allocated)
> {
> @@ -617,7 +614,8 @@ find_device (struct grub_btrfs_data *data, grub_uint64_t
> id, int do_rescan)
> * sizeof (data->devices_attached[0]));
> if (!data->devices_attached)
> {
> - grub_device_close (ctx.dev_found);
> + if (ctx.dev_found)
> + grub_device_close (ctx.dev_found);
> data->devices_attached = tmp;
> return NULL;
> }
> @@ -896,7 +894,7 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data,
> grub_disk_addr_t addr,
> " for laddr 0x%" PRIxGRUB_UINT64_T "\n", paddr,
> addr);
>
> - dev = find_device (data, stripe->device_id, j);
> + dev = find_device (data, stripe->device_id);
> if (!dev)
> {
> grub_dprintf ("btrfs",
> @@ -973,7 +971,8 @@ grub_btrfs_unmount (struct grub_btrfs_data *data)
> unsigned i;
> /* The device 0 is closed one layer upper. */
> for (i = 1; i < data->n_devices_attached; i++)
> - grub_device_close (data->devices_attached[i].dev);
> + if (data->devices_attached[i].dev)
> + grub_device_close (data->devices_attached[i].dev);
> grub_free (data->devices_attached);
> grub_free (data->extent);
> grub_free (data);
> --
> 2.17.1
>
>
>
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