Revision ac34ebb3a67e699edcb5ac72f19d31679369dfaa authored by Christopher Yeoh on 31 May 2012, 23:26:42 UTC, committed by Linus Torvalds on 01 June 2012, 00:49:32 UTC
A cleanup of rw_copy_check_uvector and compat_rw_copy_check_uvector after changes made to support CMA in an earlier patch. Rather than having an additional check_access parameter to these functions, the first paramater type is overloaded to allow the caller to specify CHECK_IOVEC_ONLY which means check that the contents of the iovec are valid, but do not check the memory that they point to. This is used by process_vm_readv/writev where we need to validate that a iovec passed to the syscall is valid but do not want to check the memory that it points to at this point because it refers to an address space in another process. Signed-off-by: Chris Yeoh <yeohc@au1.ibm.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent ee62c6b
do_mounts.h
#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/init.h>
#include <linux/syscalls.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/mount.h>
#include <linux/major.h>
#include <linux/root_dev.h>
void change_floppy(char *fmt, ...);
void mount_block_root(char *name, int flags);
void mount_root(void);
extern int root_mountflags;
static inline int create_dev(char *name, dev_t dev)
{
sys_unlink(name);
return sys_mknod(name, S_IFBLK|0600, new_encode_dev(dev));
}
#if BITS_PER_LONG == 32
static inline u32 bstat(char *name)
{
struct stat64 stat;
if (sys_stat64(name, &stat) != 0)
return 0;
if (!S_ISBLK(stat.st_mode))
return 0;
if (stat.st_rdev != (u32)stat.st_rdev)
return 0;
return stat.st_rdev;
}
#else
static inline u32 bstat(char *name)
{
struct stat stat;
if (sys_newstat(name, &stat) != 0)
return 0;
if (!S_ISBLK(stat.st_mode))
return 0;
return stat.st_rdev;
}
#endif
#ifdef CONFIG_BLK_DEV_RAM
int __init rd_load_disk(int n);
int __init rd_load_image(char *from);
#else
static inline int rd_load_disk(int n) { return 0; }
static inline int rd_load_image(char *from) { return 0; }
#endif
#ifdef CONFIG_BLK_DEV_INITRD
int __init initrd_load(void);
#else
static inline int initrd_load(void) { return 0; }
#endif
#ifdef CONFIG_BLK_DEV_MD
void md_run_setup(void);
#else
static inline void md_run_setup(void) {}
#endif
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