CGroup API files: update cpusets to use cgroup structured file API

[safe/jmp/linux-2.6] / init / initramfs.c

diff --git a/init/initramfs.c b/init/initramfs.c
index f81cfa4..8eeeccb 100644 (file)
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -30,6 +30,7 @@ static void __init free(void *where)
 
 static __initdata struct hash {
        int ino, minor, major;
+       mode_t mode;
        struct hash *next;
        char name[N_ALIGN(PATH_MAX)];
 } *head[32];
@@ -41,7 +42,8 @@ static inline int hash(int major, int minor, int ino)
        return tmp & 31;
 }
 
-static char __init *find_link(int major, int minor, int ino, char *name)
+static char __init *find_link(int major, int minor, int ino,
+                             mode_t mode, char *name)
 {
        struct hash **p, *q;
        for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
@@ -51,14 +53,17 @@ static char __init *find_link(int major, int minor, int ino, char *name)
                        continue;
                if ((*p)->major != major)
                        continue;
+               if (((*p)->mode ^ mode) & S_IFMT)
+                       continue;
                return (*p)->name;
        }
-       q = (struct hash *)malloc(sizeof(struct hash));
+       q = kmalloc(sizeof(struct hash), GFP_KERNEL);
        if (!q)
                panic("can't allocate link hash entry");
-       q->ino = ino;
-       q->minor = minor;
        q->major = major;
+       q->minor = minor;
+       q->ino = ino;
+       q->mode = mode;
        strcpy(q->name, name);
        q->next = NULL;
        *p = q;
@@ -72,7 +77,7 @@ static void __init free_hash(void)
                while (*p) {
                        q = *p;
                        *p = q->next;
-                       free(q);
+                       kfree(q);
                }
        }
 }
@@ -128,7 +133,7 @@ static __initdata loff_t this_header, next_header;
 
 static __initdata int dry_run;
 
-static inline void eat(unsigned n)
+static inline void __init eat(unsigned n)
 {
        victim += n;
        this_header += n;
@@ -177,6 +182,10 @@ static int __init do_collect(void)
 
 static int __init do_header(void)
 {
+       if (memcmp(collected, "070707", 6)==0) {
+               error("incorrect cpio method used: use -H newc option");
+               return 1;
+       }
        if (memcmp(collected, "070701", 6)) {
                error("no cpio magic");
                return 1;
@@ -229,13 +238,25 @@ static int __init do_reset(void)
 static int __init maybe_link(void)
 {
        if (nlink >= 2) {
-               char *old = find_link(major, minor, ino, collected);
+               char *old = find_link(major, minor, ino, mode, collected);
                if (old)
                        return (sys_link(old, collected) < 0) ? -1 : 1;
        }
        return 0;
 }
 
+static void __init clean_path(char *path, mode_t mode)
+{
+       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);
+       }
+}
+
 static __initdata int wfd;
 
 static int __init do_name(void)
@@ -248,9 +269,15 @@ static int __init do_name(void)
        }
        if (dry_run)
                return 0;
+       clean_path(collected, mode);
        if (S_ISREG(mode)) {
-               if (maybe_link() >= 0) {
-                       wfd = sys_open(collected, O_WRONLY|O_CREAT, mode);
+               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);
+
                        if (wfd >= 0) {
                                sys_fchown(wfd, uid, gid);
                                sys_fchmod(wfd, mode);
@@ -291,6 +318,7 @@ static int __init do_copy(void)
 static int __init do_symlink(void)
 {
        collected[N_ALIGN(name_len) + body_len] = '\0';
+       clean_path(collected, 0);
        sys_symlink(collected + N_ALIGN(name_len), collected);
        sys_lchown(collected, uid, gid);
        state = SkipIt;
@@ -417,10 +445,10 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
 {
        int written;
        dry_run = check_only;
-       header_buf = malloc(110);
-       symlink_buf = malloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1);
-       name_buf = malloc(N_ALIGN(PATH_MAX));
-       window = malloc(WSIZE);
+       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);
+       window = kmalloc(WSIZE, GFP_KERNEL);
        if (!window || !header_buf || !symlink_buf || !name_buf)
                panic("can't allocate buffers");
        state = Start;
@@ -456,15 +484,25 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
                buf += inptr;
                len -= inptr;
        }
-       free(window);
-       free(name_buf);
-       free(symlink_buf);
-       free(header_buf);
+       kfree(window);
+       kfree(name_buf);
+       kfree(symlink_buf);
+       kfree(header_buf);
        return message;
 }
 
+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);
+
 extern char __initramfs_start[], __initramfs_end[];
-#ifdef CONFIG_BLK_DEV_INITRD
 #include <linux/initrd.h>
 #include <linux/kexec.h>
 
@@ -473,7 +511,11 @@ static void __init free_initrd(void)
 #ifdef CONFIG_KEXEC
        unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
        unsigned long crashk_end   = (unsigned long)__va(crashk_res.end);
+#endif
+       if (do_retain_initrd)
+               goto skip;
 
+#ifdef CONFIG_KEXEC
        /*
         * If the initrd region is overlapped with crashkernel reserved region,
         * free only memory that is not part of crashkernel region.
@@ -491,20 +533,17 @@ static void __init free_initrd(void)
        } else
 #endif
                free_initrd_mem(initrd_start, initrd_end);
-
+skip:
        initrd_start = 0;
        initrd_end = 0;
 }
 
-#endif
-
-void __init populate_rootfs(void)
+static int __init populate_rootfs(void)
 {
        char *err = unpack_to_rootfs(__initramfs_start,
                         __initramfs_end - __initramfs_start, 0);
        if (err)
                panic(err);
-#ifdef CONFIG_BLK_DEV_INITRD
        if (initrd_start) {
 #ifdef CONFIG_BLK_DEV_RAM
                int fd;
@@ -516,7 +555,7 @@ void __init populate_rootfs(void)
                        unpack_to_rootfs((char *)initrd_start,
                                initrd_end - initrd_start, 0);
                        free_initrd();
-                       return;
+                       return 0;
                }
                printk("it isn't (%s); looks like an initrd\n", err);
                fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700);
@@ -536,5 +575,6 @@ void __init populate_rootfs(void)
                free_initrd();
 #endif
        }
-#endif
+       return 0;
 }
+rootfs_initcall(populate_rootfs);