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Commit 937309d3 authored by Jeremy Compostella's avatar Jeremy Compostella
Browse files

ueventd: support by-name symlinks for virtual block devices 



This patch makes ueventd create by-name symlinks for virtual block
devices when Android is running as a Xen guest OS.

The symlinks will be created under /dev/block/vbd/. For example:
/dev/block/vbd/768/by-name/

Change-Id: Id45da560d13f641d7c8419511c154de9ae8a4ec9
Test: manual
Signed-off-by: default avatarJeremy Compostella <jeremy.compostella@intel.com>
parent 6684ec8d

init/devices.cpp

+31 −0
Original line number Diff line number Diff line
@@ -390,6 +390,34 @@ static int find_pci_device_prefix(const char *path, char *buf, ssize_t buf_sz) 
    return 0;

}



/* Given a path that may start with a virtual block device, populate

 * the supplied buffer with the virtual block device ID and return 0.

 * If it doesn't start with a virtual block device, or there is some

 * error, return -1 */

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

{

    const char *start, *end;



    /* Beginning of the prefix is the initial "vbd-" after "/devices/" */

    if (strncmp(path, "/devices/vbd-", 13))

        return -1;



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

       virtual block device ID. Example: 768 */

    start = path + 13;

    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;

}



static void parse_event(const char *msg, struct uevent *uevent)

{

    uevent->action = "";
@@ -516,6 +544,9 @@ 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_vbd_device_prefix(uevent->path, buf, sizeof(buf))) {

        device = buf;

        type = "vbd";

    } else {

        return NULL;

    }