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634 lines
15 KiB
634 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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/fd.h> |
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#include <linux/tty.h> |
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#include <linux/suspend.h> |
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#include <linux/root_dev.h> |
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#include <linux/security.h> |
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#include <linux/delay.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 <linux/initrd.h> |
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#include <linux/async.h> |
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#include <linux/fs_struct.h> |
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#include <linux/slab.h> |
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#include <linux/ramfs.h> |
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#include <linux/shmem_fs.h> |
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|
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#include <linux/nfs_fs.h> |
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#include <linux/nfs_fs_sb.h> |
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#include <linux/nfs_mount.h> |
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#include <linux/raid/detect.h> |
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#include <uapi/linux/mount.h> |
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|
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#include "do_mounts.h" |
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int root_mountflags = MS_RDONLY | MS_SILENT; |
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static char * __initdata root_device_name; |
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static char __initdata saved_root_name[64]; |
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static int root_wait; |
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dev_t ROOT_DEV; |
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|
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static int __init load_ramdisk(char *str) |
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{ |
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pr_warn("ignoring the deprecated load_ramdisk= option\n"); |
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return 1; |
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} |
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__setup("load_ramdisk=", load_ramdisk); |
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|
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static int __init readonly(char *str) |
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{ |
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if (*str) |
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return 0; |
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root_mountflags |= MS_RDONLY; |
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return 1; |
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} |
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|
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static int __init readwrite(char *str) |
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{ |
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if (*str) |
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return 0; |
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root_mountflags &= ~MS_RDONLY; |
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return 1; |
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} |
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|
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__setup("ro", readonly); |
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__setup("rw", readwrite); |
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|
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#ifdef CONFIG_BLOCK |
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struct uuidcmp { |
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const char *uuid; |
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int len; |
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}; |
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|
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/** |
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* match_dev_by_uuid - callback for finding a partition using its uuid |
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* @dev: device passed in by the caller |
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* @data: opaque pointer to the desired struct uuidcmp 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_uuid(struct device *dev, const void *data) |
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{ |
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struct block_device *bdev = dev_to_bdev(dev); |
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const struct uuidcmp *cmp = data; |
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|
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if (!bdev->bd_meta_info || |
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strncasecmp(cmp->uuid, bdev->bd_meta_info->uuid, cmp->len)) |
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return 0; |
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return 1; |
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} |
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|
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/** |
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* devt_from_partuuid - looks up the dev_t of a partition by its UUID |
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* @uuid_str: char array containing ascii UUID |
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* |
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* The function will return the first partition which contains a matching |
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* UUID value in its partition_meta_info struct. This does not search |
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* by filesystem UUIDs. |
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* |
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* If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be |
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* extracted and used as an offset from the partition identified by the UUID. |
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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_partuuid(const char *uuid_str) |
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{ |
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struct uuidcmp cmp; |
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struct device *dev = NULL; |
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dev_t devt = 0; |
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int offset = 0; |
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char *slash; |
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cmp.uuid = uuid_str; |
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slash = strchr(uuid_str, '/'); |
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/* Check for optional partition number offset attributes. */ |
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if (slash) { |
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char c = 0; |
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/* Explicitly fail on poor PARTUUID syntax. */ |
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if (sscanf(slash + 1, "PARTNROFF=%d%c", &offset, &c) != 1) |
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goto clear_root_wait; |
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cmp.len = slash - uuid_str; |
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} else { |
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cmp.len = strlen(uuid_str); |
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} |
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if (!cmp.len) |
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goto clear_root_wait; |
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dev = class_find_device(&block_class, NULL, &cmp, &match_dev_by_uuid); |
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if (!dev) |
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return 0; |
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if (offset) { |
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/* |
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* Attempt to find the requested partition by adding an offset |
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* to the partition number found by UUID. |
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*/ |
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devt = part_devt(dev_to_disk(dev), |
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dev_to_bdev(dev)->bd_partno + offset); |
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} else { |
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devt = dev->devt; |
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} |
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put_device(dev); |
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return devt; |
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clear_root_wait: |
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pr_err("VFS: PARTUUID= is invalid.\n" |
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"Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); |
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if (root_wait) |
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pr_err("Disabling rootwait; root= is invalid.\n"); |
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root_wait = 0; |
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return 0; |
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} |
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/** |
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* match_dev_by_label - callback for finding a partition using its label |
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* @dev: device passed in by the caller |
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* @data: opaque pointer to the label 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_label(struct device *dev, const void *data) |
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{ |
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struct block_device *bdev = dev_to_bdev(dev); |
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const char *label = data; |
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|
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if (!bdev->bd_meta_info || strcmp(label, bdev->bd_meta_info->volname)) |
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return 0; |
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return 1; |
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} |
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static dev_t devt_from_partlabel(const char *label) |
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{ |
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struct device *dev; |
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dev_t devt = 0; |
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dev = class_find_device(&block_class, NULL, label, &match_dev_by_label); |
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if (dev) { |
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devt = dev->devt; |
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put_device(dev); |
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} |
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return devt; |
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} |
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static dev_t devt_from_devname(const char *name) |
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{ |
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dev_t devt = 0; |
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int part; |
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char s[32]; |
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char *p; |
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if (strlen(name) > 31) |
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return 0; |
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strcpy(s, name); |
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for (p = s; *p; p++) { |
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if (*p == '/') |
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*p = '!'; |
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} |
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devt = blk_lookup_devt(s, 0); |
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if (devt) |
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return devt; |
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/* |
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* Try non-existent, but valid partition, which may only exist after |
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* opening the device, like partitioned md devices. |
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*/ |
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while (p > s && isdigit(p[-1])) |
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p--; |
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if (p == s || !*p || *p == '0') |
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return 0; |
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/* try disk name without <part number> */ |
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part = simple_strtoul(p, NULL, 10); |
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*p = '\0'; |
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devt = blk_lookup_devt(s, part); |
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if (devt) |
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return devt; |
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/* try disk name without p<part number> */ |
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if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') |
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return 0; |
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p[-1] = '\0'; |
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return blk_lookup_devt(s, part); |
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} |
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#endif /* CONFIG_BLOCK */ |
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static dev_t devt_from_devnum(const char *name) |
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{ |
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unsigned maj, min, offset; |
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dev_t devt = 0; |
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char *p, dummy; |
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if (sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2 || |
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sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3) { |
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devt = MKDEV(maj, min); |
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if (maj != MAJOR(devt) || min != MINOR(devt)) |
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return 0; |
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} else { |
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devt = new_decode_dev(simple_strtoul(name, &p, 16)); |
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if (*p) |
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return 0; |
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} |
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return devt; |
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} |
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/* |
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* Convert a name into device number. We accept the following variants: |
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* |
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* 1) <hex_major><hex_minor> device number in hexadecimal represents itself |
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* no leading 0x, for example b302. |
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* 2) /dev/nfs represents Root_NFS (0xff) |
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* 3) /dev/<disk_name> represents the device number of disk |
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* 4) /dev/<disk_name><decimal> represents the device number |
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* of partition - device number of disk plus the partition number |
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* 5) /dev/<disk_name>p<decimal> - same as the above, that form is |
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* used when disk name of partitioned disk ends on a digit. |
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* 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the |
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* unique id of a partition if the partition table provides it. |
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* The UUID may be either an EFI/GPT UUID, or refer to an MSDOS |
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* partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- |
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* filled hex representation of the 32-bit "NT disk signature", and PP |
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* is a zero-filled hex representation of the 1-based partition number. |
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* 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to |
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* a partition with a known unique id. |
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* 8) <major>:<minor> major and minor number of the device separated by |
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* a colon. |
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* 9) PARTLABEL=<name> with name being the GPT partition label. |
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* MSDOS partitions do not support labels! |
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* 10) /dev/cifs represents Root_CIFS (0xfe) |
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* |
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* If name doesn't have fall into the categories above, we return (0,0). |
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* block_class is used to check if something is a disk name. If the disk |
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* name contains slashes, the device name has them replaced with |
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* bangs. |
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*/ |
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dev_t name_to_dev_t(const char *name) |
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{ |
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if (strcmp(name, "/dev/nfs") == 0) |
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return Root_NFS; |
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if (strcmp(name, "/dev/cifs") == 0) |
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return Root_CIFS; |
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if (strcmp(name, "/dev/ram") == 0) |
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return Root_RAM0; |
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#ifdef CONFIG_BLOCK |
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if (strncmp(name, "PARTUUID=", 9) == 0) |
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return devt_from_partuuid(name + 9); |
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if (strncmp(name, "PARTLABEL=", 10) == 0) |
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return devt_from_partlabel(name + 10); |
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if (strncmp(name, "/dev/", 5) == 0) |
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return devt_from_devname(name + 5); |
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#endif |
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return devt_from_devnum(name); |
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} |
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EXPORT_SYMBOL_GPL(name_to_dev_t); |
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static int __init root_dev_setup(char *line) |
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{ |
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strlcpy(saved_root_name, line, sizeof(saved_root_name)); |
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return 1; |
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} |
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__setup("root=", root_dev_setup); |
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static int __init rootwait_setup(char *str) |
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{ |
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if (*str) |
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return 0; |
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root_wait = 1; |
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return 1; |
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} |
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__setup("rootwait", rootwait_setup); |
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static char * __initdata root_mount_data; |
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static int __init root_data_setup(char *str) |
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{ |
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root_mount_data = str; |
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return 1; |
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} |
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static char * __initdata root_fs_names; |
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static int __init fs_names_setup(char *str) |
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{ |
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root_fs_names = str; |
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return 1; |
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} |
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static unsigned int __initdata root_delay; |
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static int __init root_delay_setup(char *str) |
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{ |
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root_delay = simple_strtoul(str, NULL, 0); |
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return 1; |
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} |
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__setup("rootflags=", root_data_setup); |
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__setup("rootfstype=", fs_names_setup); |
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__setup("rootdelay=", root_delay_setup); |
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static void __init get_fs_names(char *page) |
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{ |
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char *s = page; |
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if (root_fs_names) { |
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strcpy(page, root_fs_names); |
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while (*s++) { |
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if (s[-1] == ',') |
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s[-1] = '\0'; |
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} |
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} else { |
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int len = get_filesystem_list(page); |
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char *p, *next; |
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page[len] = '\0'; |
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for (p = page-1; p; p = next) { |
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next = strchr(++p, '\n'); |
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if (*p++ != '\t') |
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continue; |
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while ((*s++ = *p++) != '\n') |
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; |
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s[-1] = '\0'; |
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} |
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} |
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*s = '\0'; |
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} |
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static int __init do_mount_root(const char *name, const char *fs, |
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const int flags, const void *data) |
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{ |
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struct super_block *s; |
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struct page *p = NULL; |
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char *data_page = NULL; |
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int ret; |
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if (data) { |
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/* init_mount() requires a full page as fifth argument */ |
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p = alloc_page(GFP_KERNEL); |
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if (!p) |
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return -ENOMEM; |
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data_page = page_address(p); |
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/* zero-pad. init_mount() will make sure it's terminated */ |
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strncpy(data_page, data, PAGE_SIZE); |
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} |
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ret = init_mount(name, "/root", fs, flags, data_page); |
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if (ret) |
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goto out; |
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init_chdir("/root"); |
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s = current->fs->pwd.dentry->d_sb; |
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ROOT_DEV = s->s_dev; |
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printk(KERN_INFO |
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"VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", |
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s->s_type->name, |
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sb_rdonly(s) ? " readonly" : "", |
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MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); |
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|
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out: |
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if (p) |
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put_page(p); |
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return ret; |
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} |
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|
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void __init mount_block_root(char *name, int flags) |
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{ |
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struct page *page = alloc_page(GFP_KERNEL); |
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char *fs_names = page_address(page); |
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char *p; |
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char b[BDEVNAME_SIZE]; |
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|
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scnprintf(b, BDEVNAME_SIZE, "unknown-block(%u,%u)", |
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MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); |
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get_fs_names(fs_names); |
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retry: |
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for (p = fs_names; *p; p += strlen(p)+1) { |
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int err = do_mount_root(name, p, flags, root_mount_data); |
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switch (err) { |
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case 0: |
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goto out; |
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case -EACCES: |
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case -EINVAL: |
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continue; |
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} |
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/* |
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* Allow the user to distinguish between failed sys_open |
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* and bad superblock on root device. |
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* and give them a list of the available devices |
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*/ |
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printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", |
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root_device_name, b, err); |
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printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
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printk_all_partitions(); |
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#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT |
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printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " |
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"explicit textual name for \"root=\" boot option.\n"); |
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#endif |
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panic("VFS: Unable to mount root fs on %s", b); |
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} |
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if (!(flags & SB_RDONLY)) { |
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flags |= SB_RDONLY; |
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goto retry; |
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} |
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printk("List of all partitions:\n"); |
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printk_all_partitions(); |
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printk("No filesystem could mount root, tried: "); |
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for (p = fs_names; *p; p += strlen(p)+1) |
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printk(" %s", p); |
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printk("\n"); |
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panic("VFS: Unable to mount root fs on %s", b); |
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out: |
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put_page(page); |
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} |
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#ifdef CONFIG_ROOT_NFS |
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|
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#define NFSROOT_TIMEOUT_MIN 5 |
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#define NFSROOT_TIMEOUT_MAX 30 |
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#define NFSROOT_RETRY_MAX 5 |
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|
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static int __init mount_nfs_root(void) |
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{ |
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char *root_dev, *root_data; |
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unsigned int timeout; |
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int try, err; |
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err = nfs_root_data(&root_dev, &root_data); |
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if (err != 0) |
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return 0; |
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|
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/* |
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* The server or network may not be ready, so try several |
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* times. Stop after a few tries in case the client wants |
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* to fall back to other boot methods. |
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*/ |
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timeout = NFSROOT_TIMEOUT_MIN; |
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for (try = 1; ; try++) { |
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err = do_mount_root(root_dev, "nfs", |
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root_mountflags, root_data); |
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if (err == 0) |
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return 1; |
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if (try > NFSROOT_RETRY_MAX) |
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break; |
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|
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/* Wait, in case the server refused us immediately */ |
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ssleep(timeout); |
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timeout <<= 1; |
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if (timeout > NFSROOT_TIMEOUT_MAX) |
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timeout = NFSROOT_TIMEOUT_MAX; |
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} |
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return 0; |
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} |
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#endif |
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#ifdef CONFIG_CIFS_ROOT |
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|
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extern int cifs_root_data(char **dev, char **opts); |
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|
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#define CIFSROOT_TIMEOUT_MIN 5 |
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#define CIFSROOT_TIMEOUT_MAX 30 |
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#define CIFSROOT_RETRY_MAX 5 |
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|
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static int __init mount_cifs_root(void) |
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{ |
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char *root_dev, *root_data; |
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unsigned int timeout; |
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int try, err; |
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err = cifs_root_data(&root_dev, &root_data); |
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if (err != 0) |
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return 0; |
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timeout = CIFSROOT_TIMEOUT_MIN; |
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for (try = 1; ; try++) { |
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err = do_mount_root(root_dev, "cifs", root_mountflags, |
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root_data); |
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if (err == 0) |
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return 1; |
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if (try > CIFSROOT_RETRY_MAX) |
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break; |
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|
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ssleep(timeout); |
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timeout <<= 1; |
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if (timeout > CIFSROOT_TIMEOUT_MAX) |
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timeout = CIFSROOT_TIMEOUT_MAX; |
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} |
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return 0; |
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} |
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#endif |
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|
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void __init mount_root(void) |
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{ |
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#ifdef CONFIG_ROOT_NFS |
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if (ROOT_DEV == Root_NFS) { |
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if (!mount_nfs_root()) |
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printk(KERN_ERR "VFS: Unable to mount root fs via NFS.\n"); |
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return; |
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} |
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#endif |
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#ifdef CONFIG_CIFS_ROOT |
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if (ROOT_DEV == Root_CIFS) { |
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if (!mount_cifs_root()) |
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printk(KERN_ERR "VFS: Unable to mount root fs via SMB.\n"); |
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return; |
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} |
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#endif |
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#ifdef CONFIG_BLOCK |
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{ |
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int err = create_dev("/dev/root", ROOT_DEV); |
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|
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if (err < 0) |
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pr_emerg("Failed to create /dev/root: %d\n", err); |
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mount_block_root("/dev/root", root_mountflags); |
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} |
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#endif |
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} |
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|
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/* |
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* Prepare the namespace - decide what/where to mount, load ramdisks, etc. |
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*/ |
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void __init prepare_namespace(void) |
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{ |
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if (root_delay) { |
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printk(KERN_INFO "Waiting %d sec before mounting root device...\n", |
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root_delay); |
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ssleep(root_delay); |
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} |
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|
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/* |
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* wait for the known devices to complete their probing |
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* |
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* Note: this is a potential source of long boot delays. |
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* For example, it is not atypical to wait 5 seconds here |
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* for the touchpad of a laptop to initialize. |
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*/ |
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wait_for_device_probe(); |
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|
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md_run_setup(); |
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|
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if (saved_root_name[0]) { |
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root_device_name = saved_root_name; |
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if (!strncmp(root_device_name, "mtd", 3) || |
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!strncmp(root_device_name, "ubi", 3)) { |
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mount_block_root(root_device_name, root_mountflags); |
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goto out; |
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} |
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ROOT_DEV = name_to_dev_t(root_device_name); |
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if (strncmp(root_device_name, "/dev/", 5) == 0) |
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root_device_name += 5; |
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} |
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|
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if (initrd_load()) |
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goto out; |
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|
|
/* wait for any asynchronous scanning to complete */ |
|
if ((ROOT_DEV == 0) && root_wait) { |
|
printk(KERN_INFO "Waiting for root device %s...\n", |
|
saved_root_name); |
|
while (driver_probe_done() != 0 || |
|
(ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) |
|
msleep(5); |
|
async_synchronize_full(); |
|
} |
|
|
|
mount_root(); |
|
out: |
|
devtmpfs_mount(); |
|
init_mount(".", "/", NULL, MS_MOVE, NULL); |
|
init_chroot("."); |
|
} |
|
|
|
static bool is_tmpfs; |
|
static int rootfs_init_fs_context(struct fs_context *fc) |
|
{ |
|
if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) |
|
return shmem_init_fs_context(fc); |
|
|
|
return ramfs_init_fs_context(fc); |
|
} |
|
|
|
struct file_system_type rootfs_fs_type = { |
|
.name = "rootfs", |
|
.init_fs_context = rootfs_init_fs_context, |
|
.kill_sb = kill_litter_super, |
|
}; |
|
|
|
void __init init_rootfs(void) |
|
{ |
|
if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && |
|
(!root_fs_names || strstr(root_fs_names, "tmpfs"))) |
|
is_tmpfs = true; |
|
}
|
|
|