On Thu, Nov 22 2012, Andrzej Pietrasiewicz wrote:
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx>
> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> ---
> drivers/usb/gadget/f_mass_storage.c | 225 +++++++++++++++++++++++++++++++++++
> 1 files changed, 225 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
> index b244ddc..c9b9d06 100644
> --- a/drivers/usb/gadget/f_mass_storage.c
> +++ b/drivers/usb/gadget/f_mass_storage.c
> +static ssize_t fsg_common_show_luns(struct fsg_common *common, char *buf)
> +{
> + return sprintf(buf, "%d\n", common->nluns);
> +}
> +
> +static ssize_t fsg_common_store_luns(struct fsg_common *common, const char *buf,
> + size_t count)
> +{
> + struct config_item *function, *config, *gadget;
> + struct dentry *parent, *new;
> + char n[UFG_STR_LEN];
UFG_STR_LEN seems like an overkill considering that the strings will be
up to 4 character long. ;)
> + u16 tmp;
> + char *p = (char *)buf;
> + int rc;
> +
> + function = common->group.cg_item.ci_parent;
> + if (!function)
> + return -EBUSY;
> +
> + config = function->ci_parent;
> + if (!config)
> + return -EBUSY;
> +
> + gadget = config->ci_parent;
> + if (!gadget)
> + return -EBUSY;
> +
> + rc = kstrtou16(p, 10, &tmp);
> + if (rc < 0)
> + return rc;
> + if (tmp > FSG_MAX_LUNS)
> + return -ERANGE;
> +
> + common->nluns = tmp;
> + parent = common->group.cg_item.ci_dentry;
> + for (tmp = 0; tmp < common->nluns; tmp++) {
> + struct qstr name;
> +
> + sprintf(n, "lun%d", tmp);
> + name.name = n;
> + name.len = strlen(name.name);
> + name.hash = full_name_hash(name.name, name.len);
> +
> + new = d_alloc(parent, &name);
> + if (IS_ERR_OR_NULL(new)) {
> + rc = -ENOMEM;
> + goto rollback;
> + }
> + d_add(new, NULL);
> + rc = ufg_mkdir(parent, new);
> + if (rc) {
> + d_drop(new);
> + dput(new);
> +
> + goto rollback;
> + }
> + dput(new); /* make the refcount 1 */
> + }
> +
> + return count;
> +
> +rollback:
> + while (tmp--) {
> + struct config_item *child;
> +
> + sprintf(n, "lun%d", tmp);
> + child = config_group_find_item(&common->group, n);
> + if (child)
> + ufg_rmdir(parent, child->ci_dentry);
> +
> + }
> + return rc;
> +}
--
Best regards, _ _
.o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
..o | Computer Science, Michał “mina86” Nazarewicz (o o)
ooo +----<email/xmpp: mpn@xxxxxxxxxx>--------------ooO--(_)--Ooo--Attachment:
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