// SPDX-License-Identifier: GPL-2.0-only#include <linux/module.h>#include <linux/sched.h>#include <linux/ctype.h>#include <linux/fd.h>#include <linux/tty.h>#include <linux/suspend.h>#include <linux/root_dev.h>#include <linux/security.h>#include <linux/delay.h>#include <linux/genhd.h>#include <linux/mount.h>#include <linux/device.h>#include <linux/init.h>#include <linux/fs.h>#include <linux/initrd.h>#include <linux/async.h>#include <linux/fs_struct.h>#include <linux/slab.h>#include <linux/ramfs.h>#include <linux/shmem_fs.h> #include <linux/nfs_fs.h>#include <linux/nfs_fs_sb.h>#include <linux/nfs_mount.h>#include <linux/raid/detect.h>#include <uapi/linux/mount.h> #include "do_mounts.h" int root_mountflags = MS_RDONLY | MS_SILENT;static char * __initdata root_device_name;static char __initdata saved_root_name[64];static int root_wait; dev_t ROOT_DEV; static int __init load_ramdisk(char *str){ pr_warn("ignoring the deprecated load_ramdisk= option\n"); return 1;}__setup("load_ramdisk=", load_ramdisk); static int __init readonly(char *str){ if (*str) return 0; root_mountflags |= MS_RDONLY; return 1;} static int __init readwrite(char *str){ if (*str) return 0; root_mountflags &= ~MS_RDONLY; return 1;} __setup("ro", readonly);__setup("rw", readwrite); #ifdef CONFIG_BLOCKstruct uuidcmp { const char *uuid; int len;}; /** * match_dev_by_uuid - callback for finding a partition using its uuid * @dev: device passed in by the caller * @data: opaque pointer to the desired struct uuidcmp to match * * Returns 1 if the device matches, and 0 otherwise. */static int match_dev_by_uuid(struct device *dev, const void *data){ struct block_device *bdev = dev_to_bdev(dev); const struct uuidcmp *cmp = data; if (!bdev->bd_meta_info || strncasecmp(cmp->uuid, bdev->bd_meta_info->uuid, cmp->len)) return 0; return 1;} /** * devt_from_partuuid - looks up the dev_t of a partition by its UUID * @uuid_str: char array containing ascii UUID * * The function will return the first partition which contains a matching * UUID value in its partition_meta_info struct. This does not search * by filesystem UUIDs. * * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be * extracted and used as an offset from the partition identified by the UUID. * * Returns the matching dev_t on success or 0 on failure. */static dev_t devt_from_partuuid(const char *uuid_str){ struct uuidcmp cmp; struct device *dev = NULL; dev_t devt = 0; int offset = 0; char *slash; cmp.uuid = uuid_str; slash = strchr(uuid_str, '/'); /* Check for optional partition number offset attributes. */ if (slash) { char c = 0; /* Explicitly fail on poor PARTUUID syntax. */ if (sscanf(slash + 1, "PARTNROFF=%d%c", &offset, &c) != 1) goto clear_root_wait; cmp.len = slash - uuid_str; } else { cmp.len = strlen(uuid_str); } if (!cmp.len) goto clear_root_wait; dev = class_find_device(&block_class, NULL, &cmp, &match_dev_by_uuid); if (!dev) return 0; if (offset) { /* * Attempt to find the requested partition by adding an offset * to the partition number found by UUID. */ struct block_device *part; part = bdget_disk(dev_to_disk(dev), dev_to_bdev(dev)->bd_partno + offset); if (part) { devt = part->bd_dev; bdput(part); } } else { devt = dev->devt; } put_device(dev); return devt; clear_root_wait: pr_err("VFS: PARTUUID= is invalid.\n" "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); if (root_wait) pr_err("Disabling rootwait; root= is invalid.\n"); root_wait = 0; return 0;} /** * match_dev_by_label - callback for finding a partition using its label * @dev: device passed in by the caller * @data: opaque pointer to the label to match * * Returns 1 if the device matches, and 0 otherwise. */static int match_dev_by_label(struct device *dev, const void *data){ struct block_device *bdev = dev_to_bdev(dev); const char *label = data; if (!bdev->bd_meta_info || strcmp(label, bdev->bd_meta_info->volname)) return 0; return 1;} static dev_t devt_from_partlabel(const char *label){ struct device *dev; dev_t devt = 0; dev = class_find_device(&block_class, NULL, label, &match_dev_by_label); if (dev) { devt = dev->devt; put_device(dev); } return devt;} static dev_t devt_from_devname(const char *name){ dev_t devt = 0; int part; char s[32]; char *p; if (strlen(name) > 31) return 0; strcpy(s, name); for (p = s; *p; p++) { if (*p == '/') *p = '!'; } devt = blk_lookup_devt(s, 0); if (devt) return devt; /* * Try non-existent, but valid partition, which may only exist after * opening the device, like partitioned md devices. */ while (p > s && isdigit(p[-1])) p--; if (p == s || !*p || *p == '0') return 0; /* try disk name without <part number> */ part = simple_strtoul(p, NULL, 10); *p = '\0'; devt = blk_lookup_devt(s, part); if (devt) return devt; /* try disk name without p<part number> */ if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') return 0; p[-1] = '\0'; return blk_lookup_devt(s, part);}#endif /* CONFIG_BLOCK */ static dev_t devt_from_devnum(const char *name){ unsigned maj, min, offset; dev_t devt = 0; char *p, dummy; if (sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2 || sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3) { devt = MKDEV(maj, min); if (maj != MAJOR(devt) || min != MINOR(devt)) return 0; } else { devt = new_decode_dev(simple_strtoul(name, &p, 16)); if (*p) return 0; } return devt;} /* * Convert a name into device number. We accept the following variants: * * 1) <hex_major><hex_minor> device number in hexadecimal represents itself * no leading 0x, for example b302. * 2) /dev/nfs represents Root_NFS (0xff) * 3) /dev/<disk_name> represents the device number of disk * 4) /dev/<disk_name><decimal> represents the device number * of partition - device number of disk plus the partition number * 5) /dev/<disk_name>p<decimal> - same as the above, that form is * used when disk name of partitioned disk ends on a digit. * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the * unique id of a partition if the partition table provides it. * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- * filled hex representation of the 32-bit "NT disk signature", and PP * is a zero-filled hex representation of the 1-based partition number. * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to * a partition with a known unique id. * 8) <major>:<minor> major and minor number of the device separated by * a colon. * 9) PARTLABEL=<name> with name being the GPT partition label. * MSDOS partitions do not support labels! * 10) /dev/cifs represents Root_CIFS (0xfe) * * If name doesn't have fall into the categories above, we return (0,0). * block_class is used to check if something is a disk name. If the disk * name contains slashes, the device name has them replaced with * bangs. */dev_t name_to_dev_t(const char *name){ if (strcmp(name, "/dev/nfs") == 0) return Root_NFS; if (strcmp(name, "/dev/cifs") == 0) return Root_CIFS; if (strcmp(name, "/dev/ram") == 0) return Root_RAM0;#ifdef CONFIG_BLOCK if (strncmp(name, "PARTUUID=", 9) == 0) return devt_from_partuuid(name + 9); if (strncmp(name, "PARTLABEL=", 10) == 0) return devt_from_partlabel(name + 10); if (strncmp(name, "/dev/", 5) == 0) return devt_from_devname(name + 5);#endif return devt_from_devnum(name);}EXPORT_SYMBOL_GPL(name_to_dev_t); static int __init root_dev_setup(char *line){ strlcpy(saved_root_name, line, sizeof(saved_root_name)); return 1;} __setup("root=", root_dev_setup); static int __init rootwait_setup(char *str){ if (*str) return 0; root_wait = 1; return 1;} __setup("rootwait", rootwait_setup); static char * __initdata root_mount_data;static int __init root_data_setup(char *str){ root_mount_data = str; return 1;} static char * __initdata root_fs_names;static int __init fs_names_setup(char *str){ root_fs_names = str; return 1;} static unsigned int __initdata root_delay;static int __init root_delay_setup(char *str){ root_delay = simple_strtoul(str, NULL, 0); return 1;} __setup("rootflags=", root_data_setup);__setup("rootfstype=", fs_names_setup);__setup("rootdelay=", root_delay_setup); static void __init get_fs_names(char *page){ char *s = page; if (root_fs_names) { strcpy(page, root_fs_names); while (*s++) { if (s[-1] == ',') s[-1] = '\0'; } } else { int len = get_filesystem_list(page); char *p, *next; page[len] = '\0'; for (p = page-1; p; p = next) { next = strchr(++p, '\n'); if (*p++ != '\t') continue; while ((*s++ = *p++) != '\n') ; s[-1] = '\0'; } } *s = '\0';} static int __init do_mount_root(const char *name, const char *fs, const int flags, const void *data){ struct super_block *s; struct page *p = NULL; char *data_page = NULL; int ret; if (data) { /* init_mount() requires a full page as fifth argument */ p = alloc_page(GFP_KERNEL); if (!p) return -ENOMEM; data_page = page_address(p); /* zero-pad. init_mount() will make sure it's terminated */ strncpy(data_page, data, PAGE_SIZE); } ret = init_mount(name, "/root", fs, flags, data_page); if (ret) goto out; init_chdir("/root"); s = current->fs->pwd.dentry->d_sb; ROOT_DEV = s->s_dev; printk(KERN_INFO "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", s->s_type->name, sb_rdonly(s) ? " readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); out: if (p) put_page(p); return ret;} void __init mount_block_root(char *name, int flags){ struct page *page = alloc_page(GFP_KERNEL); char *fs_names = page_address(page); char *p; char b[BDEVNAME_SIZE]; scnprintf(b, BDEVNAME_SIZE, "unknown-block(%u,%u)", MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); get_fs_names(fs_names);retry: for (p = fs_names; *p; p += strlen(p)+1) { int err = do_mount_root(name, p, flags, root_mount_data); switch (err) { case 0: goto out; case -EACCES: case -EINVAL: continue; } /* * Allow the user to distinguish between failed sys_open * and bad superblock on root device. * and give them a list of the available devices */ printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", root_device_name, b, err); printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); printk_all_partitions();#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " "explicit textual name for \"root=\" boot option.\n");#endif panic("VFS: Unable to mount root fs on %s", b); } if (!(flags & SB_RDONLY)) { flags |= SB_RDONLY; goto retry; } printk("List of all partitions:\n"); printk_all_partitions(); printk("No filesystem could mount root, tried: "); for (p = fs_names; *p; p += strlen(p)+1) printk(" %s", p); printk("\n"); panic("VFS: Unable to mount root fs on %s", b);out: put_page(page);} #ifdef CONFIG_ROOT_NFS #define NFSROOT_TIMEOUT_MIN 5#define NFSROOT_TIMEOUT_MAX 30#define NFSROOT_RETRY_MAX 5 static int __init mount_nfs_root(void){ char *root_dev, *root_data; unsigned int timeout; int try, err; err = nfs_root_data(&root_dev, &root_data); if (err != 0) return 0; /* * The server or network may not be ready, so try several * times. Stop after a few tries in case the client wants * to fall back to other boot methods. */ timeout = NFSROOT_TIMEOUT_MIN; for (try = 1; ; try++) { err = do_mount_root(root_dev, "nfs", root_mountflags, root_data); if (err == 0) return 1; if (try > NFSROOT_RETRY_MAX) break; /* Wait, in case the server refused us immediately */ ssleep(timeout); timeout <<= 1; if (timeout > NFSROOT_TIMEOUT_MAX) timeout = NFSROOT_TIMEOUT_MAX; } return 0;}Lines 1–500 of 640. Load more
// SPDX-License-Identifier: GPL-2.0-only #include <linux/module.h> #include <linux/sched.h> #include <linux/ctype.h> #include <linux/fd.h> #include <linux/tty.h> #include <linux/suspend.h> #include <linux/root_dev.h> #include <linux/security.h> #include <linux/delay.h> #include <linux/genhd.h> #include <linux/mount.h> #include <linux/device.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/initrd.h> #include <linux/async.h> #include <linux/fs_struct.h> #include <linux/slab.h> #include <linux/ramfs.h> #include <linux/shmem_fs.h> #include <linux/nfs_fs.h> #include <linux/nfs_fs_sb.h> #include <linux/nfs_mount.h> #include <linux/raid/detect.h> #include <uapi/linux/mount.h> #include "do_mounts.h" int root_mountflags = MS_RDONLY | MS_SILENT; static char * __initdata root_device_name; static char __initdata saved_root_name[64]; static int root_wait; dev_t ROOT_DEV; static int __init load_ramdisk(char *str) { pr_warn("ignoring the deprecated load_ramdisk= option\n"); return 1; } __setup("load_ramdisk=", load_ramdisk); static int __init readonly(char *str) { if (*str) return 0; root_mountflags |= MS_RDONLY; return 1; } static int __init readwrite(char *str) { if (*str) return 0; root_mountflags &= ~MS_RDONLY; return 1; } __setup("ro", readonly); __setup("rw", readwrite); #ifdef CONFIG_BLOCK struct uuidcmp { const char *uuid; int len; }; /** * match_dev_by_uuid - callback for finding a partition using its uuid * @dev: device passed in by the caller * @data: opaque pointer to the desired struct uuidcmp to match * * Returns 1 if the device matches, and 0 otherwise. */ static int match_dev_by_uuid(struct device *dev, const void *data) { struct block_device *bdev = dev_to_bdev(dev); const struct uuidcmp *cmp = data; if (!bdev->bd_meta_info || strncasecmp(cmp->uuid, bdev->bd_meta_info->uuid, cmp->len)) return 0; return 1; } /** * devt_from_partuuid - looks up the dev_t of a partition by its UUID * @uuid_str: char array containing ascii UUID * * The function will return the first partition which contains a matching * UUID value in its partition_meta_info struct. This does not search * by filesystem UUIDs. * * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be * extracted and used as an offset from the partition identified by the UUID. * * Returns the matching dev_t on success or 0 on failure. */ static dev_t devt_from_partuuid(const char *uuid_str) { struct uuidcmp cmp; struct device *dev = NULL; dev_t devt = 0; int offset = 0; char *slash; cmp.uuid = uuid_str; slash = strchr(uuid_str, '/'); /* Check for optional partition number offset attributes. */ if (slash) { char c = 0; /* Explicitly fail on poor PARTUUID syntax. */ if (sscanf(slash + 1, "PARTNROFF=%d%c", &offset, &c) != 1) goto clear_root_wait; cmp.len = slash - uuid_str; } else { cmp.len = strlen(uuid_str); } if (!cmp.len) goto clear_root_wait; dev = class_find_device(&block_class, NULL, &cmp, &match_dev_by_uuid); if (!dev) return 0; if (offset) { /* * Attempt to find the requested partition by adding an offset * to the partition number found by UUID. */ struct block_device *part; part = bdget_disk(dev_to_disk(dev), dev_to_bdev(dev)->bd_partno + offset); if (part) { devt = part->bd_dev; bdput(part); } } else { devt = dev->devt; } put_device(dev); return devt; clear_root_wait: pr_err("VFS: PARTUUID= is invalid.\n" "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); if (root_wait) pr_err("Disabling rootwait; root= is invalid.\n"); root_wait = 0; return 0; } /** * match_dev_by_label - callback for finding a partition using its label * @dev: device passed in by the caller * @data: opaque pointer to the label to match * * Returns 1 if the device matches, and 0 otherwise. */ static int match_dev_by_label(struct device *dev, const void *data) { struct block_device *bdev = dev_to_bdev(dev); const char *label = data; if (!bdev->bd_meta_info || strcmp(label, bdev->bd_meta_info->volname)) return 0; return 1; } static dev_t devt_from_partlabel(const char *label) { struct device *dev; dev_t devt = 0; dev = class_find_device(&block_class, NULL, label, &match_dev_by_label); if (dev) { devt = dev->devt; put_device(dev); } return devt; } static dev_t devt_from_devname(const char *name) { dev_t devt = 0; int part; char s[32]; char *p; if (strlen(name) > 31) return 0; strcpy(s, name); for (p = s; *p; p++) { if (*p == '/') *p = '!'; } devt = blk_lookup_devt(s, 0); if (devt) return devt; /* * Try non-existent, but valid partition, which may only exist after * opening the device, like partitioned md devices. */ while (p > s && isdigit(p[-1])) p--; if (p == s || !*p || *p == '0') return 0; /* try disk name without <part number> */ part = simple_strtoul(p, NULL, 10); *p = '\0'; devt = blk_lookup_devt(s, part); if (devt) return devt; /* try disk name without p<part number> */ if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') return 0; p[-1] = '\0'; return blk_lookup_devt(s, part); } #endif /* CONFIG_BLOCK */ static dev_t devt_from_devnum(const char *name) { unsigned maj, min, offset; dev_t devt = 0; char *p, dummy; if (sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2 || sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset, &dummy) == 3) { devt = MKDEV(maj, min); if (maj != MAJOR(devt) || min != MINOR(devt)) return 0; } else { devt = new_decode_dev(simple_strtoul(name, &p, 16)); if (*p) return 0; } return devt; } /* * Convert a name into device number. We accept the following variants: * * 1) <hex_major><hex_minor> device number in hexadecimal represents itself * no leading 0x, for example b302. * 2) /dev/nfs represents Root_NFS (0xff) * 3) /dev/<disk_name> represents the device number of disk * 4) /dev/<disk_name><decimal> represents the device number * of partition - device number of disk plus the partition number * 5) /dev/<disk_name>p<decimal> - same as the above, that form is * used when disk name of partitioned disk ends on a digit. * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the * unique id of a partition if the partition table provides it. * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- * filled hex representation of the 32-bit "NT disk signature", and PP * is a zero-filled hex representation of the 1-based partition number. * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to * a partition with a known unique id. * 8) <major>:<minor> major and minor number of the device separated by * a colon. * 9) PARTLABEL=<name> with name being the GPT partition label. * MSDOS partitions do not support labels! * 10) /dev/cifs represents Root_CIFS (0xfe) * * If name doesn't have fall into the categories above, we return (0,0). * block_class is used to check if something is a disk name. If the disk * name contains slashes, the device name has them replaced with * bangs. */ dev_t name_to_dev_t(const char *name) { if (strcmp(name, "/dev/nfs") == 0) return Root_NFS; if (strcmp(name, "/dev/cifs") == 0) return Root_CIFS; if (strcmp(name, "/dev/ram") == 0) return Root_RAM0; #ifdef CONFIG_BLOCK if (strncmp(name, "PARTUUID=", 9) == 0) return devt_from_partuuid(name + 9); if (strncmp(name, "PARTLABEL=", 10) == 0) return devt_from_partlabel(name + 10); if (strncmp(name, "/dev/", 5) == 0) return devt_from_devname(name + 5); #endif return devt_from_devnum(name); } EXPORT_SYMBOL_GPL(name_to_dev_t); static int __init root_dev_setup(char *line) { strlcpy(saved_root_name, line, sizeof(saved_root_name)); return 1; } __setup("root=", root_dev_setup); static int __init rootwait_setup(char *str) { if (*str) return 0; root_wait = 1; return 1; } __setup("rootwait", rootwait_setup); static char * __initdata root_mount_data; static int __init root_data_setup(char *str) { root_mount_data = str; return 1; } static char * __initdata root_fs_names; static int __init fs_names_setup(char *str) { root_fs_names = str; return 1; } static unsigned int __initdata root_delay; static int __init root_delay_setup(char *str) { root_delay = simple_strtoul(str, NULL, 0); return 1; } __setup("rootflags=", root_data_setup); __setup("rootfstype=", fs_names_setup); __setup("rootdelay=", root_delay_setup); static void __init get_fs_names(char *page) { char *s = page; if (root_fs_names) { strcpy(page, root_fs_names); while (*s++) { if (s[-1] == ',') s[-1] = '\0'; } } else { int len = get_filesystem_list(page); char *p, *next; page[len] = '\0'; for (p = page-1; p; p = next) { next = strchr(++p, '\n'); if (*p++ != '\t') continue; while ((*s++ = *p++) != '\n') ; s[-1] = '\0'; } } *s = '\0'; } static int __init do_mount_root(const char *name, const char *fs, const int flags, const void *data) { struct super_block *s; struct page *p = NULL; char *data_page = NULL; int ret; if (data) { /* init_mount() requires a full page as fifth argument */ p = alloc_page(GFP_KERNEL); if (!p) return -ENOMEM; data_page = page_address(p); /* zero-pad. init_mount() will make sure it's terminated */ strncpy(data_page, data, PAGE_SIZE); } ret = init_mount(name, "/root", fs, flags, data_page); if (ret) goto out; init_chdir("/root"); s = current->fs->pwd.dentry->d_sb; ROOT_DEV = s->s_dev; printk(KERN_INFO "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", s->s_type->name, sb_rdonly(s) ? " readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); out: if (p) put_page(p); return ret; } void __init mount_block_root(char *name, int flags) { struct page *page = alloc_page(GFP_KERNEL); char *fs_names = page_address(page); char *p; char b[BDEVNAME_SIZE]; scnprintf(b, BDEVNAME_SIZE, "unknown-block(%u,%u)", MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); get_fs_names(fs_names); retry: for (p = fs_names; *p; p += strlen(p)+1) { int err = do_mount_root(name, p, flags, root_mount_data); switch (err) { case 0: goto out; case -EACCES: case -EINVAL: continue; } /* * Allow the user to distinguish between failed sys_open * and bad superblock on root device. * and give them a list of the available devices */ printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", root_device_name, b, err); printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); printk_all_partitions(); #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " "explicit textual name for \"root=\" boot option.\n"); #endif panic("VFS: Unable to mount root fs on %s", b); } if (!(flags & SB_RDONLY)) { flags |= SB_RDONLY; goto retry; } printk("List of all partitions:\n"); printk_all_partitions(); printk("No filesystem could mount root, tried: "); for (p = fs_names; *p; p += strlen(p)+1) printk(" %s", p); printk("\n"); panic("VFS: Unable to mount root fs on %s", b); out: put_page(page); } #ifdef CONFIG_ROOT_NFS #define NFSROOT_TIMEOUT_MIN 5 #define NFSROOT_TIMEOUT_MAX 30 #define NFSROOT_RETRY_MAX 5 static int __init mount_nfs_root(void) { char *root_dev, *root_data; unsigned int timeout; int try, err; err = nfs_root_data(&root_dev, &root_data); if (err != 0) return 0; /* * The server or network may not be ready, so try several * times. Stop after a few tries in case the client wants * to fall back to other boot methods. */ timeout = NFSROOT_TIMEOUT_MIN; for (try = 1; ; try++) { err = do_mount_root(root_dev, "nfs", root_mountflags, root_data); if (err == 0) return 1; if (try > NFSROOT_RETRY_MAX) break; /* Wait, in case the server refused us immediately */ ssleep(timeout); timeout <<= 1; if (timeout > NFSROOT_TIMEOUT_MAX) timeout = NFSROOT_TIMEOUT_MAX; } return 0; }