126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
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/*
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* Many of the syscalls used in this file expect some of the arguments
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* to be __user pointers not __kernel pointers. To limit the sparse
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* noise, turn off sparse checking for this file.
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*/
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#ifdef __CHECKER__
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#undef __CHECKER__
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#warning "Sparse checking disabled for this file"
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#endif
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/ctype.h>
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#include <linux/genhd.h>
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#include <linux/mount.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include "do_mounts.h"
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struct namecmp {
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const char *name;
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int len;
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};
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/**
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* match_dev_by_name - callback for finding a partition using its name
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* @dev: device passed in by the caller
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* @data: opaque pointer to the desired struct namecmp to match
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*
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* Returns 1 if the device matches, and 0 otherwise.
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*/
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static int match_dev_by_name(struct device *dev, const void *data)
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{
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const struct namecmp *cmp = data;
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struct hd_struct *part = dev_to_part(dev);
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if (!part->info)
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goto no_match;
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if (strncasecmp(cmp->name, part->info->volname, cmp->len))
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goto no_match;
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return 1;
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no_match:
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return 0;
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}
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/**
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* devt_from_partname - looks up the dev_t of a partition by its name
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* @name_str: char array containing ascii name
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*
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* The function will return the first partition which contains a matching
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* name value in its partition_meta_info struct.
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*
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* Returns the matching dev_t on success or 0 on failure.
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*/
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static dev_t devt_from_partname(const char *name_str)
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{
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dev_t res = 0;
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struct namecmp cmp;
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struct device *dev = NULL;
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cmp.name = name_str;
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cmp.len = strlen(name_str);
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dev = class_find_device(&block_class, NULL, &cmp,
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&match_dev_by_name);
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if (!dev)
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goto out;
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res = dev->devt;
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put_device(dev);
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out:
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return res;
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}
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struct mount_map {
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char *name;
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char *dev_name;
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char *mountpoint;
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} mount_maps[] = {
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{"eng_system", "/dev/eng_system", "/root/eng"},
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{"eng_vendor", "/dev/eng_vendor", "/root/eng/vendor"},
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};
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void __init mount_block_root_post(void)
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{
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dev_t ENG_DEV;
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int i, err;
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char *name, *dev_name, *mountpoint;
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int mount_flags = MS_RDONLY | MS_SILENT;
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for (i = 0; i < ARRAY_SIZE(mount_maps); i++) {
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name = mount_maps[i].name;
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dev_name = mount_maps[i].dev_name;
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mountpoint = mount_maps[i].mountpoint;
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/* create device node */
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ENG_DEV = devt_from_partname(name);
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err = create_dev(dev_name, ENG_DEV);
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if (err < 0) {
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pr_info("Failed to create %s: %d\n", dev_name, err);
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break;
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}
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/* mount */
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err = sys_mount(dev_name, mountpoint, "ext4", mount_flags, NULL);
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if (err) {
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pr_info("Failed to mount %s: %d\n", dev_name, err);
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break;
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}
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pr_info("VFS: Mounted %s on device %s(%u:%u).\n",
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mountpoint, dev_name, MAJOR(ENG_DEV), MINOR(ENG_DEV));
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}
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err = sys_mount("/root/eng/init", "/root/init", NULL, MS_BIND, NULL);
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if (err) {
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pr_info("Failed to bind mount: %d\n", err);
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return;
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}
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return;
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}
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