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Commit 3572bc61 authored by Brian Beloshapka's avatar Brian Beloshapka Committed by Steve Kondik
Browse files

init: create symlinks to mtd block device nodes 

Given a device in the form of "/devices/virtual/mtd/mtd0/mtdblock0":
* Creates symlinks for mtd block devices in
  /dev/block/mtd/mtd<partition number>
* Creates symlinks based on partition name in
  /dev/block/mtd/by-name/<partition name>

Change-Id: Id8d61be88935a0ef83297d1d5e453d8ba0d586de
parent e9af679e

init/devices.c

+59 −0
Original line number Diff line number Diff line
@@ -352,6 +352,35 @@ static void remove_platform_device(const char *path) 
    }

}



/* Given a path that may start with an MTD device (/devices/virtual/mtd/mtd8/mtdblock8),

 * populate the supplied buffer with the MTD partition number and return 0.

 * If it doesn't start with an MTD device, or there is some error, return -1 */

static int find_mtd_device_prefix(const char *path, char *buf, ssize_t buf_sz)

{

    const char *start, *end;



    if (strncmp(path, "/devices/virtual/mtd", 20))

        return -1;



    /* Beginning of the prefix is the initial "mtdXX" after "/devices/virtual/mtd/" */

    start = path + 21;



    /* End of the prefix is one path '/' later, capturing the partition number

     * Example: mtd8 */

    end = strchr(start, '/');

    if (!end) {

        return -1;

    }



    /* Make sure we have enough room for the string plus null terminator */

    if (end - start + 1 > buf_sz)

        return -1;



    strncpy(buf, start, end - start);

    buf[end - start] = '\0';

    return 0;

}



/* Given a path that may start with a PCI device, populate the supplied buffer

 * with the PCI domain/bus number and the peripheral ID and return 0.

 * If it doesn't start with a PCI device, or there is some error, return -1 */
@@ -557,6 +586,10 @@ static char **get_block_device_symlinks(struct uevent *uevent) 
    char *p;

    unsigned int size;

    struct stat info;

    int mtd_fd = -1;

    int nr;

    char mtd_name_path[256];

    char mtd_name[64];



    pdev = find_platform_device(uevent->path);

    if (pdev) {
@@ -565,6 +598,9 @@ static char **get_block_device_symlinks(struct uevent *uevent) 
    } else if (!find_pci_device_prefix(uevent->path, buf, sizeof(buf))) {

        device = buf;

        type = "pci";

    } else if (!find_mtd_device_prefix(uevent->path, buf, sizeof(buf))) {

        device = buf;

        type = "mtd";

    } else {

        return NULL;

    }
@@ -578,6 +614,29 @@ static char **get_block_device_symlinks(struct uevent *uevent) 


    snprintf(link_path, sizeof(link_path), "/dev/block/%s/%s", type, device);



    if(!strcmp(type, "mtd")) {

        snprintf(mtd_name_path, sizeof(mtd_name_path),

            "/sys/devices/virtual/%s/%s/name", type, device);

        mtd_fd = open(mtd_name_path, O_RDONLY);

            if(mtd_fd < 0) {

                ERROR("Unable to open %s for reading", mtd_name_path);

                return NULL;

            }

        nr = read(mtd_fd, mtd_name, sizeof(mtd_name) - 1);

        if (nr <= 0)

            return NULL;

        close(mtd_fd);

        mtd_name[nr - 1] = '\0';



        p = strdup(mtd_name);

        sanitize(p);

        if (asprintf(&links[link_num], "/dev/block/%s/by-name/%s", type, p) > 0)

            link_num++;

        else

            links[link_num] = NULL;

        free(p);

    }



    if (uevent->partition_name) {

        p = strdup(uevent->partition_name);

        sanitize(p);