video: tegra: host: Fix a warning from fifo_gk20a
[linux-3.10.git] / init / initramfs.c
index e44f2d9..a67ef9d 100644 (file)
@@ -1,3 +1,13 @@
+/*
+ * 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
+
 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/slab.h>
@@ -22,7 +32,7 @@ static void __init error(char *x)
 
 static __initdata struct hash {
        int ino, minor, major;
-       mode_t mode;
+       umode_t mode;
        struct hash *next;
        char name[N_ALIGN(PATH_MAX)];
 } *head[32];
@@ -35,7 +45,7 @@ static inline int hash(int major, int minor, int ino)
 }
 
 static char __init *find_link(int major, int minor, int ino,
-                             mode_t mode, char *name)
+                             umode_t mode, char *name)
 {
        struct hash **p, *q;
        for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
@@ -74,7 +84,7 @@ static void __init free_hash(void)
        }
 }
 
-static long __init do_utime(char __user *filename, time_t mtime)
+static long __init do_utime(char *filename, time_t mtime)
 {
        struct timespec t[2];
 
@@ -120,7 +130,7 @@ static __initdata time_t mtime;
 /* cpio header parsing */
 
 static __initdata unsigned long ino, major, minor, nlink;
-static __initdata mode_t mode;
+static __initdata umode_t mode;
 static __initdata unsigned long body_len, name_len;
 static __initdata uid_t uid;
 static __initdata gid_t gid;
@@ -276,7 +286,7 @@ static int __init maybe_link(void)
        return 0;
 }
 
-static void __init clean_path(char *path, mode_t mode)
+static void __init clean_path(char *path, umode_t mode)
 {
        struct stat st;
 
@@ -310,7 +320,8 @@ static int __init do_name(void)
                        if (wfd >= 0) {
                                sys_fchown(wfd, uid, gid);
                                sys_fchmod(wfd, mode);
-                               sys_ftruncate(wfd, body_len);
+                               if (body_len)
+                                       sys_ftruncate(wfd, body_len);
                                vcollected = kstrdup(collected, GFP_KERNEL);
                                state = CopyFile;
                        }
@@ -412,7 +423,7 @@ static unsigned my_inptr;   /* index of next byte to be processed in inbuf */
 
 static char * __init unpack_to_rootfs(char *buf, unsigned len)
 {
-       int written;
+       int written, res;
        decompress_fn decompress;
        const char *compress_name;
        static __initdata char msg_buf[64];
@@ -444,17 +455,20 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len)
                }
                this_header = 0;
                decompress = decompress_method(buf, len, &compress_name);
-               if (decompress)
-                       decompress(buf, len, NULL, flush_buffer, NULL,
+               if (decompress) {
+                       res = decompress(buf, len, NULL, flush_buffer, NULL,
                                   &my_inptr, error);
-               else if (compress_name) {
+                       if (res)
+                               error("decompressor failed");
+               } else if (compress_name) {
                        if (!message) {
                                snprintf(msg_buf, sizeof msg_buf,
                                         "compression method %s not configured",
                                         compress_name);
                                message = msg_buf;
                        }
-               }
+               } else
+                       error("junk in compressed archive");
                if (state != Reset)
                        error("junk in compressed archive");
                this_header = saved_offset + my_inptr;
@@ -479,7 +493,8 @@ static int __init retain_initrd_param(char *str)
 }
 __setup("retain_initrd", retain_initrd_param);
 
-extern char __initramfs_start[], __initramfs_end[];
+extern char __initramfs_start[];
+extern unsigned long __initramfs_size;
 #include <linux/initrd.h>
 #include <linux/kexec.h>
 
@@ -522,7 +537,7 @@ static void __init clean_rootfs(void)
        int fd;
        void *buf;
        struct linux_dirent64 *dirp;
-       int count;
+       int num;
 
        fd = sys_open("/", O_RDONLY, 0);
        WARN_ON(fd < 0);
@@ -536,9 +551,9 @@ static void __init clean_rootfs(void)
        }
 
        dirp = buf;
-       count = sys_getdents64(fd, dirp, BUF_SIZE);
-       while (count > 0) {
-               while (count > 0) {
+       num = sys_getdents64(fd, dirp, BUF_SIZE);
+       while (num > 0) {
+               while (num > 0) {
                        struct stat st;
                        int ret;
 
@@ -551,12 +566,12 @@ static void __init clean_rootfs(void)
                                        sys_unlink(dirp->d_name);
                        }
 
-                       count -= dirp->d_reclen;
+                       num -= dirp->d_reclen;
                        dirp = (void *)dirp + dirp->d_reclen;
                }
                dirp = buf;
                memset(buf, 0, BUF_SIZE);
-               count = sys_getdents64(fd, dirp, BUF_SIZE);
+               num = sys_getdents64(fd, dirp, BUF_SIZE);
        }
 
        sys_close(fd);
@@ -566,46 +581,46 @@ static void __init clean_rootfs(void)
 
 static int __init populate_rootfs(void)
 {
-       char *err = unpack_to_rootfs(__initramfs_start,
-                        __initramfs_end - __initramfs_start);
+       char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
        if (err)
                panic(err);     /* Failed to decompress INTERNAL initramfs */
        if (initrd_start) {
 #ifdef CONFIG_BLK_DEV_RAM
                int fd;
-               printk(KERN_INFO "checking if image is initramfs...\n");
+               printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
                err = unpack_to_rootfs((char *)initrd_start,
                        initrd_end - initrd_start);
                if (!err) {
-                       printk(KERN_INFO "rootfs image is initramfs; unpacking...\n");
                        free_initrd();
-                       return 0;
+                       goto done;
                } else {
                        clean_rootfs();
-                       unpack_to_rootfs(__initramfs_start,
-                                __initramfs_end - __initramfs_start);
+                       unpack_to_rootfs(__initramfs_start, __initramfs_size);
                }
                printk(KERN_INFO "rootfs image is not initramfs (%s)"
                                "; looks like an initrd\n", err);
-               fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700);
+               fd = sys_open("/initrd.image",
+                             O_WRONLY|O_CREAT, 0700);
                if (fd >= 0) {
                        sys_write(fd, (char *)initrd_start,
                                        initrd_end - initrd_start);
                        sys_close(fd);
                        free_initrd();
                }
+       done:
 #else
-               printk(KERN_INFO "Unpacking initramfs...");
+               printk(KERN_INFO "Unpacking initramfs...\n");
                err = unpack_to_rootfs((char *)initrd_start,
                        initrd_end - initrd_start);
-               if (err) {
-                       printk(" failed!\n");
-                       printk(KERN_EMERG "%s\n", err);
-               } else {
-                       printk(" done\n");
-               }
+               if (err)
+                       printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
                free_initrd();
 #endif
+               /*
+                * Try loading default modules from initramfs.  This gives
+                * us a chance to load before device_initcalls.
+                */
+               load_default_modules();
        }
        return 0;
 }