[PATCH] mtd: core: allow mask_flags to be set for mtd_add_partition

Bruno Pena brunompena at gmail.com
Tue Nov 26 13:25:11 PST 2019


This patchs makes it possible to mask certain flags for new partitions (e.g. to make them read-only).
The change consists in the addition of a new argument "mask_flags" to "mtd_add_partition" that is passed on to the "allocate_partition".

Signed-off-by: Bruno Pena <brunompena at gmail.com>
---
 drivers/mtd/mtdchar.c          | 5 ++++-
 drivers/mtd/mtdpart.c          | 3 ++-
 include/linux/mtd/partitions.h | 2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 0238952..0c0a6f2 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -583,7 +583,10 @@ static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
 		/* Sanitize user input */
 		p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
 
-		return mtd_add_partition(mtd, p.devname, p.start, p.length);
+		/* No mtd flag masking required */
+		uint32_t mask_flags = 0;
+
+		return mtd_add_partition(mtd, p.devname, p.start, p.length, mask_flags);
 
 	case BLKPG_DEL_PARTITION:
 
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index b6af41b..66675a4 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -588,7 +588,7 @@ static int mtd_add_partition_attrs(struct mtd_part *new)
 }
 
 int mtd_add_partition(struct mtd_info *parent, const char *name,
-		      long long offset, long long length)
+		      long long offset, long long length, uint32_t mask_flags)
 {
 	struct mtd_partition part;
 	struct mtd_part *new;
@@ -609,6 +609,7 @@ int mtd_add_partition(struct mtd_info *parent, const char *name,
 	part.name = name;
 	part.size = length;
 	part.offset = offset;
+	part.mask_flags = mask_flags;
 
 	new = allocate_partition(parent, &part, -1, offset);
 	if (IS_ERR(new))
diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h
index 11cb0c5..1a0deeb 100644
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -107,7 +107,7 @@ extern void deregister_mtd_parser(struct mtd_part_parser *parser);
 
 int mtd_is_partition(const struct mtd_info *mtd);
 int mtd_add_partition(struct mtd_info *master, const char *name,
-		      long long offset, long long length);
+		      long long offset, long long length, uint32_t mask_flags);
 int mtd_del_partition(struct mtd_info *master, int partno);
 uint64_t mtd_get_device_size(const struct mtd_info *mtd);
 
-- 
2.7.4




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