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init/initramfs.c
13.1 KB
c67e5382f init: disable spa... |
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/* * Many of the syscalls used in this file expect some of the arguments * to be __user pointers not __kernel pointers. To limit the sparse * noise, turn off sparse checking for this file. */ #ifdef __CHECKER__ #undef __CHECKER__ #warning "Sparse checking disabled for this file" #endif |
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#include <linux/init.h> #include <linux/fs.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/fcntl.h> #include <linux/delay.h> #include <linux/string.h> |
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#include <linux/dirent.h> |
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#include <linux/syscalls.h> |
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#include <linux/utime.h> |
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static __initdata char *message; static void __init error(char *x) { if (!message) message = x; } |
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/* link hash */ |
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#define N_ALIGN(len) ((((len) + 1) & ~3) + 2) |
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static __initdata struct hash { int ino, minor, major; |
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umode_t mode; |
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struct hash *next; |
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char name[N_ALIGN(PATH_MAX)]; |
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} *head[32]; static inline int hash(int major, int minor, int ino) { unsigned long tmp = ino + minor + (major << 3); tmp += tmp >> 5; return tmp & 31; } |
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static char __init *find_link(int major, int minor, int ino, |
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umode_t mode, char *name) |
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{ struct hash **p, *q; for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) { if ((*p)->ino != ino) continue; if ((*p)->minor != minor) continue; if ((*p)->major != major) continue; |
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if (((*p)->mode ^ mode) & S_IFMT) continue; |
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return (*p)->name; } |
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q = kmalloc(sizeof(struct hash), GFP_KERNEL); |
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if (!q) panic("can't allocate link hash entry"); |
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q->major = major; |
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q->minor = minor; q->ino = ino; q->mode = mode; |
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strcpy(q->name, name); |
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q->next = NULL; *p = q; return NULL; } static void __init free_hash(void) { struct hash **p, *q; for (p = head; p < head + 32; p++) { while (*p) { q = *p; *p = q->next; |
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kfree(q); |
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} } } |
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static long __init do_utime(char *filename, time_t mtime) |
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{ struct timespec t[2]; t[0].tv_sec = mtime; t[0].tv_nsec = 0; t[1].tv_sec = mtime; t[1].tv_nsec = 0; return do_utimes(AT_FDCWD, filename, t, AT_SYMLINK_NOFOLLOW); } static __initdata LIST_HEAD(dir_list); struct dir_entry { struct list_head list; char *name; time_t mtime; }; static void __init dir_add(const char *name, time_t mtime) { struct dir_entry *de = kmalloc(sizeof(struct dir_entry), GFP_KERNEL); if (!de) panic("can't allocate dir_entry buffer"); INIT_LIST_HEAD(&de->list); de->name = kstrdup(name, GFP_KERNEL); de->mtime = mtime; list_add(&de->list, &dir_list); } static void __init dir_utime(void) { struct dir_entry *de, *tmp; list_for_each_entry_safe(de, tmp, &dir_list, list) { list_del(&de->list); do_utime(de->name, de->mtime); kfree(de->name); kfree(de); } } static __initdata time_t mtime; |
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/* cpio header parsing */ static __initdata unsigned long ino, major, minor, nlink; |
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static __initdata umode_t mode; |
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static __initdata unsigned long body_len, name_len; static __initdata uid_t uid; static __initdata gid_t gid; static __initdata unsigned rdev; static void __init parse_header(char *s) { unsigned long parsed[12]; char buf[9]; int i; buf[8] = '\0'; for (i = 0, s += 6; i < 12; i++, s += 8) { memcpy(buf, s, 8); parsed[i] = simple_strtoul(buf, NULL, 16); } ino = parsed[0]; mode = parsed[1]; uid = parsed[2]; gid = parsed[3]; nlink = parsed[4]; |
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mtime = parsed[5]; |
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body_len = parsed[6]; major = parsed[7]; minor = parsed[8]; rdev = new_encode_dev(MKDEV(parsed[9], parsed[10])); name_len = parsed[11]; } /* FSM */ static __initdata enum state { Start, Collect, GotHeader, SkipIt, GotName, CopyFile, GotSymlink, Reset } state, next_state; static __initdata char *victim; static __initdata unsigned count; static __initdata loff_t this_header, next_header; |
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static inline void __init eat(unsigned n) |
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{ victim += n; this_header += n; count -= n; } |
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static __initdata char *vcollected; |
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static __initdata char *collected; static __initdata int remains; static __initdata char *collect; static void __init read_into(char *buf, unsigned size, enum state next) { if (count >= size) { collected = victim; eat(size); state = next; } else { collect = collected = buf; remains = size; next_state = next; state = Collect; } } static __initdata char *header_buf, *symlink_buf, *name_buf; static int __init do_start(void) { read_into(header_buf, 110, GotHeader); return 0; } static int __init do_collect(void) { unsigned n = remains; if (count < n) n = count; memcpy(collect, victim, n); eat(n); collect += n; if ((remains -= n) != 0) return 1; state = next_state; return 0; } static int __init do_header(void) { |
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if (memcmp(collected, "070707", 6)==0) { error("incorrect cpio method used: use -H newc option"); return 1; } |
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if (memcmp(collected, "070701", 6)) { error("no cpio magic"); return 1; } parse_header(collected); next_header = this_header + N_ALIGN(name_len) + body_len; next_header = (next_header + 3) & ~3; |
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state = SkipIt; if (name_len <= 0 || name_len > PATH_MAX) return 0; if (S_ISLNK(mode)) { if (body_len > PATH_MAX) return 0; collect = collected = symlink_buf; remains = N_ALIGN(name_len) + body_len; next_state = GotSymlink; state = Collect; return 0; } if (S_ISREG(mode) || !body_len) read_into(name_buf, N_ALIGN(name_len), GotName); return 0; } static int __init do_skip(void) { if (this_header + count < next_header) { eat(count); return 1; } else { eat(next_header - this_header); state = next_state; return 0; } } static int __init do_reset(void) { while(count && *victim == '\0') eat(1); if (count && (this_header & 3)) error("broken padding"); return 1; } static int __init maybe_link(void) { if (nlink >= 2) { |
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char *old = find_link(major, minor, ino, mode, collected); |
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if (old) return (sys_link(old, collected) < 0) ? -1 : 1; } return 0; } |
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static void __init clean_path(char *path, umode_t mode) |
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{ struct stat st; if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) { if (S_ISDIR(st.st_mode)) sys_rmdir(path); else sys_unlink(path); } } |
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static __initdata int wfd; static int __init do_name(void) { state = SkipIt; next_state = Reset; if (strcmp(collected, "TRAILER!!!") == 0) { free_hash(); return 0; } |
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clean_path(collected, mode); |
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if (S_ISREG(mode)) { |
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int ml = maybe_link(); if (ml >= 0) { int openflags = O_WRONLY|O_CREAT; if (ml != 1) openflags |= O_TRUNC; wfd = sys_open(collected, openflags, mode); |
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if (wfd >= 0) { sys_fchown(wfd, uid, gid); sys_fchmod(wfd, mode); |
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if (body_len) sys_ftruncate(wfd, body_len); |
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vcollected = kstrdup(collected, GFP_KERNEL); |
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state = CopyFile; } } } else if (S_ISDIR(mode)) { sys_mkdir(collected, mode); sys_chown(collected, uid, gid); sys_chmod(collected, mode); |
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dir_add(collected, mtime); |
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} else if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { if (maybe_link() == 0) { sys_mknod(collected, mode, rdev); sys_chown(collected, uid, gid); sys_chmod(collected, mode); |
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do_utime(collected, mtime); |
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} } return 0; } static int __init do_copy(void) { if (count >= body_len) { sys_write(wfd, victim, body_len); sys_close(wfd); |
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do_utime(vcollected, mtime); kfree(vcollected); |
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eat(body_len); state = SkipIt; return 0; } else { sys_write(wfd, victim, count); body_len -= count; eat(count); return 1; } } static int __init do_symlink(void) { collected[N_ALIGN(name_len) + body_len] = '\0'; |
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clean_path(collected, 0); |
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sys_symlink(collected + N_ALIGN(name_len), collected); sys_lchown(collected, uid, gid); |
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do_utime(collected, mtime); |
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state = SkipIt; next_state = Reset; return 0; } static __initdata int (*actions[])(void) = { [Start] = do_start, [Collect] = do_collect, [GotHeader] = do_header, [SkipIt] = do_skip, [GotName] = do_name, [CopyFile] = do_copy, [GotSymlink] = do_symlink, [Reset] = do_reset, }; static int __init write_buffer(char *buf, unsigned len) { count = len; victim = buf; while (!actions[state]()) ; return len - count; } |
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static int __init flush_buffer(void *bufv, unsigned len) |
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{ |
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char *buf = (char *) bufv; |
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int written; |
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int origLen = len; |
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if (message) |
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return -1; |
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while ((written = write_buffer(buf, len)) < len && !message) { char c = buf[written]; if (c == '0') { buf += written; len -= written; state = Start; } else if (c == 0) { buf += written; len -= written; state = Reset; } else error("junk in compressed archive"); } |
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return origLen; |
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} |
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static unsigned my_inptr; /* index of next byte to be processed in inbuf */ |
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|
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#include <linux/decompress/generic.h> |
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|
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static char * __init unpack_to_rootfs(char *buf, unsigned len) |
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{ |
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int written, res; |
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decompress_fn decompress; |
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const char *compress_name; static __initdata char msg_buf[64]; |
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|
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header_buf = kmalloc(110, GFP_KERNEL); symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL); name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL); |
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if (!header_buf || !symlink_buf || !name_buf) |
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panic("can't allocate buffers"); |
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|
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state = Start; this_header = 0; message = NULL; while (!message && len) { loff_t saved_offset = this_header; if (*buf == '0' && !(this_header & 3)) { state = Start; written = write_buffer(buf, len); buf += written; len -= written; continue; } if (!*buf) { buf++; len--; this_header++; continue; } this_header = 0; |
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decompress = decompress_method(buf, len, &compress_name); |
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pr_debug("Detected %s compressed data ", compress_name); |
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if (decompress) { res = decompress(buf, len, NULL, flush_buffer, NULL, |
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&my_inptr, error); |
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if (res) error("decompressor failed"); } else if (compress_name) { |
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if (!message) { snprintf(msg_buf, sizeof msg_buf, "compression method %s not configured", compress_name); message = msg_buf; } |
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} else error("junk in compressed archive"); |
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if (state != Reset) |
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error("junk in compressed archive"); this_header = saved_offset + my_inptr; buf += my_inptr; len -= my_inptr; |
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} |
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dir_utime(); |
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kfree(name_buf); kfree(symlink_buf); kfree(header_buf); |
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return message; } |
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static int __initdata do_retain_initrd; static int __init retain_initrd_param(char *str) { if (*str) return 0; do_retain_initrd = 1; return 1; } __setup("retain_initrd", retain_initrd_param); |
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extern char __initramfs_start[]; extern unsigned long __initramfs_size; |
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#include <linux/initrd.h> |
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#include <linux/kexec.h> |
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static void __init free_initrd(void) { |
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#ifdef CONFIG_KEXEC unsigned long crashk_start = (unsigned long)__va(crashk_res.start); unsigned long crashk_end = (unsigned long)__va(crashk_res.end); |
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#endif if (do_retain_initrd) goto skip; |
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|
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#ifdef CONFIG_KEXEC |
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/* * If the initrd region is overlapped with crashkernel reserved region, * free only memory that is not part of crashkernel region. */ if (initrd_start < crashk_end && initrd_end > crashk_start) { /* * Initialize initrd memory region since the kexec boot does * not do. */ memset((void *)initrd_start, 0, initrd_end - initrd_start); if (initrd_start < crashk_start) free_initrd_mem(initrd_start, crashk_start); if (initrd_end > crashk_end) free_initrd_mem(crashk_end, initrd_end); } else #endif free_initrd_mem(initrd_start, initrd_end); |
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skip: |
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initrd_start = 0; initrd_end = 0; } |
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#ifdef CONFIG_BLK_DEV_RAM |
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#define BUF_SIZE 1024 static void __init clean_rootfs(void) { int fd; void *buf; struct linux_dirent64 *dirp; |
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int num; |
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|
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fd = sys_open("/", O_RDONLY, 0); |
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WARN_ON(fd < 0); if (fd < 0) return; buf = kzalloc(BUF_SIZE, GFP_KERNEL); WARN_ON(!buf); if (!buf) { sys_close(fd); return; } dirp = buf; |
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num = sys_getdents64(fd, dirp, BUF_SIZE); while (num > 0) { while (num > 0) { |
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struct stat st; int ret; ret = sys_newlstat(dirp->d_name, &st); WARN_ON_ONCE(ret); if (!ret) { if (S_ISDIR(st.st_mode)) sys_rmdir(dirp->d_name); else sys_unlink(dirp->d_name); } |
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num -= dirp->d_reclen; |
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dirp = (void *)dirp + dirp->d_reclen; } dirp = buf; memset(buf, 0, BUF_SIZE); |
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num = sys_getdents64(fd, dirp, BUF_SIZE); |
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} sys_close(fd); kfree(buf); } |
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#endif |
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|
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static int __init populate_rootfs(void) |
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{ |
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char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size); |
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if (err) |
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panic("%s", err); /* Failed to decompress INTERNAL initramfs */ |
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if (initrd_start) { |
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#ifdef CONFIG_BLK_DEV_RAM |
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int fd; |
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printk(KERN_INFO "Trying to unpack rootfs image as initramfs... "); |
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err = unpack_to_rootfs((char *)initrd_start, |
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initrd_end - initrd_start); |
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if (!err) { |
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free_initrd(); |
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goto done; |
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} else { clean_rootfs(); |
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unpack_to_rootfs(__initramfs_start, __initramfs_size); |
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} |
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printk(KERN_INFO "rootfs image is not initramfs (%s)" "; looks like an initrd ", err); |
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fd = sys_open("/initrd.image", |
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O_WRONLY|O_CREAT, 0700); |
1da177e4c Linux-2.6.12-rc2 |
590 591 592 593 |
if (fd >= 0) { sys_write(fd, (char *)initrd_start, initrd_end - initrd_start); sys_close(fd); |
0f3d2bd54 [PATCH] free init... |
594 |
free_initrd(); |
1da177e4c Linux-2.6.12-rc2 |
595 |
} |
bb813f4c9 init, block: try ... |
596 |
done: |
340e48e66 [PATCH] BLK_DEV_I... |
597 |
#else |
a1e6b6c1a initramfs: clean ... |
598 599 |
printk(KERN_INFO "Unpacking initramfs... "); |
340e48e66 [PATCH] BLK_DEV_I... |
600 |
err = unpack_to_rootfs((char *)initrd_start, |
df52092f3 fastboot: remove ... |
601 |
initrd_end - initrd_start); |
a1e6b6c1a initramfs: clean ... |
602 603 604 |
if (err) printk(KERN_EMERG "Initramfs unpacking failed: %s ", err); |
340e48e66 [PATCH] BLK_DEV_I... |
605 606 |
free_initrd(); #endif |
bb813f4c9 init, block: try ... |
607 608 609 610 611 |
/* * Try loading default modules from initramfs. This gives * us a chance to load before device_initcalls. */ load_default_modules(); |
1da177e4c Linux-2.6.12-rc2 |
612 |
} |
8d610dd52 Make sure we popu... |
613 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
614 |
} |
8d610dd52 Make sure we popu... |
615 |
rootfs_initcall(populate_rootfs); |