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authorBrandon Maier <brandon.maier@collins.com>2022-12-12 12:01:58 -0600
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2023-05-30 11:12:12 +0200
commit730148bc94411f13a0171204e872b0760fbde185 (patch)
tree8b07dd5ef274c0e4e36944f4ef6929399a77e56f /lib
parenta527b22f0a30d66d4674624d16f4bb0ffe2e94d0 (diff)
mtd-utils: Add new syntax to get devices by name
This introduces a new feature to the MTD command line utilities that allows MTD devices to be referenced by name instead of device node. For example this looks like: > # Display info for the MTD device with name "data" > mtdinfo mtd:data > # Copy file to MTD device with name "data" > flashcp /my/file mtd:data This follows the syntax supported by the kernel which allows MTD device's to be mounted by name[1]. Add the function mtd_find_dev_node() that accepts an MTD "identifier" and returns the MTD's device node. The function accepts a string starting with "mtd:" which it treats as the MTD's name. It then attempts to search for the MTD, and if found maps it back to the /dev/mtdX device node. If the string does not start with "mtd:", then assume it's the old style and refers directly to a MTD device node. The function is then hooked into existing tools like flashcp, mtdinfo, flash_unlock, etc. To load in the new MTD parsing code in a consistent way across programs. [1] http://www.linux-mtd.infradead.org/faq/jffs2.html#L_mtdblock Signed-off-by: Brandon Maier <brandon.maier@collins.com> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib')
-rw-r--r--lib/common.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/lib/common.c b/lib/common.c
index 8041878..e278593 100644
--- a/lib/common.c
+++ b/lib/common.c
@@ -33,6 +33,9 @@
#include <stdlib.h>
#include <unistd.h>
#include "common.h"
+#include "libmtd.h"
+
+#define MTD_DEV_PATT "/dev/mtd%d"
/**
* get_multiplier - convert size specifier to an integer multiplier.
@@ -162,3 +165,46 @@ int util_srand(void)
srand(seed);
return 0;
}
+
+/**
+ * mtd_find_dev_node - Find the device node for an MTD
+ * @id: Identifier for the MTD. this can be the device node itself, or
+ * "mtd:<name>" to look up MTD by name
+ *
+ * This is a helper function to convert MTD device identifiers into their
+ * device node.
+ *
+ * Returns a pointer to a string containing the device node that must be
+ * free'd, or NULL on failure.
+ */
+char *mtd_find_dev_node(const char *id)
+{
+ struct mtd_dev_info info;
+ struct libmtd_t *lib_mtd;
+ char *node;
+ int ret;
+
+ if (strncmp(id, "mtd:", 4)) {
+ /* Assume @id is the device node */
+ return strdup(id);
+ }
+
+ /* Search for MTD matching name */
+ id += 4;
+
+ lib_mtd = libmtd_open();
+ if (!lib_mtd)
+ return NULL;
+
+ ret = mtd_get_dev_info2(lib_mtd, id, &info);
+ libmtd_close(lib_mtd);
+ if (ret < 0)
+ return NULL;
+
+ node = malloc(strlen(MTD_DEV_PATT) + 20);
+ if (!node)
+ return NULL;
+
+ sprintf(node, MTD_DEV_PATT, info.mtd_num);
+ return node;
+}