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59 lines
2.2 KiB
Diff
59 lines
2.2 KiB
Diff
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From 463c5eedb4a13b9aa91f05498a0f2c20bd03f8c4 Mon Sep 17 00:00:00 2001
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From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
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Date: Wed, 5 Mar 2014 11:16:14 -0300
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Subject: [PATCH] UBI: make UBI_IOCVOLCRBLK take a parameter for future usage
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In order to allow a future ioctl parameter, such as a creation flag,
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we change the UBI_IOCVOLCRBLK so it accepts a struct ubi_blkcreate_req.
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For the time being the structure is not in use, but fully reserved.
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This ABI change is still possible and harmless, because the ioctl has just
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been introduced and there's no userspace program which uses it.
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Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
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Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
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---
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include/uapi/mtd/ubi-user.h | 19 +++++++++++++++----
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1 file changed, 15 insertions(+), 4 deletions(-)
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--- a/include/uapi/mtd/ubi-user.h
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+++ b/include/uapi/mtd/ubi-user.h
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@@ -138,9 +138,12 @@
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* Block devices on UBI volumes
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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- * To create or remove a R/O block device on top of an UBI volume the
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- * %UBI_IOCVOLCRBLK and %UBI_IOCVOLRMBLK ioctl commands should be used,
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- * respectively. These commands take no arguments.
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+ * To create a R/O block device on top of an UBI volume the %UBI_IOCVOLCRBLK
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+ * should be used. A pointer to a &struct ubi_blkcreate_req object is expected
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+ * to be passed, which is not used and reserved for future usage.
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+ *
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+ * Conversely, to remove a block device the %UBI_IOCVOLRMBLK should be used,
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+ * which takes no arguments.
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*/
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/*
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@@ -199,7 +202,7 @@
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#define UBI_IOCSETVOLPROP _IOW(UBI_VOL_IOC_MAGIC, 6, \
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struct ubi_set_vol_prop_req)
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/* Create a R/O block device on top of an UBI volume */
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-#define UBI_IOCVOLCRBLK _IO(UBI_VOL_IOC_MAGIC, 7)
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+#define UBI_IOCVOLCRBLK _IOW(UBI_VOL_IOC_MAGIC, 7, struct ubi_blkcreate_req)
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/* Remove the R/O block device */
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#define UBI_IOCVOLRMBLK _IO(UBI_VOL_IOC_MAGIC, 8)
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@@ -431,4 +434,12 @@ struct ubi_set_vol_prop_req {
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__u64 value;
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} __packed;
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+/**
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+ * struct ubi_blkcreate_req - a data structure used in block creation requests.
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+ * @padding: reserved for future, not used, has to be zeroed
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+ */
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+struct ubi_blkcreate_req {
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+ __s8 padding[128];
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+} __packed;
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+
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#endif /* __UBI_USER_H__ */
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