mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
4f911138c8
The immutable and append-only properties on an inode are published on the inode's i_flags and enforced by the VFS. Create a helper to fill the corresponding STATX_ATTR_ flags in the kstat structure from the inode's i_flags. Only orange was converted to use this helper. Other filesystems could use it in the future. Suggested-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
792 lines
21 KiB
C
792 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/fs/stat.c
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/file.h>
|
|
#include <linux/highuid.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/security.h>
|
|
#include <linux/cred.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/compat.h>
|
|
|
|
#include <linux/uaccess.h>
|
|
#include <asm/unistd.h>
|
|
|
|
#include "internal.h"
|
|
#include "mount.h"
|
|
|
|
/**
|
|
* generic_fillattr - Fill in the basic attributes from the inode struct
|
|
* @mnt_userns: user namespace of the mount the inode was found from
|
|
* @inode: Inode to use as the source
|
|
* @stat: Where to fill in the attributes
|
|
*
|
|
* Fill in the basic attributes in the kstat structure from data that's to be
|
|
* found on the VFS inode structure. This is the default if no getattr inode
|
|
* operation is supplied.
|
|
*
|
|
* If the inode has been found through an idmapped mount the user namespace of
|
|
* the vfsmount must be passed through @mnt_userns. This function will then
|
|
* take care to map the inode according to @mnt_userns before filling in the
|
|
* uid and gid filds. On non-idmapped mounts or if permission checking is to be
|
|
* performed on the raw inode simply passs init_user_ns.
|
|
*/
|
|
void generic_fillattr(struct user_namespace *mnt_userns, struct inode *inode,
|
|
struct kstat *stat)
|
|
{
|
|
stat->dev = inode->i_sb->s_dev;
|
|
stat->ino = inode->i_ino;
|
|
stat->mode = inode->i_mode;
|
|
stat->nlink = inode->i_nlink;
|
|
stat->uid = i_uid_into_mnt(mnt_userns, inode);
|
|
stat->gid = i_gid_into_mnt(mnt_userns, inode);
|
|
stat->rdev = inode->i_rdev;
|
|
stat->size = i_size_read(inode);
|
|
stat->atime = inode->i_atime;
|
|
stat->mtime = inode->i_mtime;
|
|
stat->ctime = inode->i_ctime;
|
|
stat->blksize = i_blocksize(inode);
|
|
stat->blocks = inode->i_blocks;
|
|
}
|
|
EXPORT_SYMBOL(generic_fillattr);
|
|
|
|
/**
|
|
* generic_fill_statx_attr - Fill in the statx attributes from the inode flags
|
|
* @inode: Inode to use as the source
|
|
* @stat: Where to fill in the attribute flags
|
|
*
|
|
* Fill in the STATX_ATTR_* flags in the kstat structure for properties of the
|
|
* inode that are published on i_flags and enforced by the VFS.
|
|
*/
|
|
void generic_fill_statx_attr(struct inode *inode, struct kstat *stat)
|
|
{
|
|
if (inode->i_flags & S_IMMUTABLE)
|
|
stat->attributes |= STATX_ATTR_IMMUTABLE;
|
|
if (inode->i_flags & S_APPEND)
|
|
stat->attributes |= STATX_ATTR_APPEND;
|
|
stat->attributes_mask |= KSTAT_ATTR_VFS_FLAGS;
|
|
}
|
|
EXPORT_SYMBOL(generic_fill_statx_attr);
|
|
|
|
/**
|
|
* vfs_getattr_nosec - getattr without security checks
|
|
* @path: file to get attributes from
|
|
* @stat: structure to return attributes in
|
|
* @request_mask: STATX_xxx flags indicating what the caller wants
|
|
* @query_flags: Query mode (AT_STATX_SYNC_TYPE)
|
|
*
|
|
* Get attributes without calling security_inode_getattr.
|
|
*
|
|
* Currently the only caller other than vfs_getattr is internal to the
|
|
* filehandle lookup code, which uses only the inode number and returns no
|
|
* attributes to any user. Any other code probably wants vfs_getattr.
|
|
*/
|
|
int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
|
|
u32 request_mask, unsigned int query_flags)
|
|
{
|
|
struct user_namespace *mnt_userns;
|
|
struct inode *inode = d_backing_inode(path->dentry);
|
|
|
|
memset(stat, 0, sizeof(*stat));
|
|
stat->result_mask |= STATX_BASIC_STATS;
|
|
query_flags &= AT_STATX_SYNC_TYPE;
|
|
|
|
/* allow the fs to override these if it really wants to */
|
|
/* SB_NOATIME means filesystem supplies dummy atime value */
|
|
if (inode->i_sb->s_flags & SB_NOATIME)
|
|
stat->result_mask &= ~STATX_ATIME;
|
|
|
|
/*
|
|
* Note: If you add another clause to set an attribute flag, please
|
|
* update attributes_mask below.
|
|
*/
|
|
if (IS_AUTOMOUNT(inode))
|
|
stat->attributes |= STATX_ATTR_AUTOMOUNT;
|
|
|
|
if (IS_DAX(inode))
|
|
stat->attributes |= STATX_ATTR_DAX;
|
|
|
|
stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT |
|
|
STATX_ATTR_DAX);
|
|
|
|
mnt_userns = mnt_user_ns(path->mnt);
|
|
if (inode->i_op->getattr)
|
|
return inode->i_op->getattr(mnt_userns, path, stat,
|
|
request_mask, query_flags);
|
|
|
|
generic_fillattr(mnt_userns, inode, stat);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(vfs_getattr_nosec);
|
|
|
|
/*
|
|
* vfs_getattr - Get the enhanced basic attributes of a file
|
|
* @path: The file of interest
|
|
* @stat: Where to return the statistics
|
|
* @request_mask: STATX_xxx flags indicating what the caller wants
|
|
* @query_flags: Query mode (AT_STATX_SYNC_TYPE)
|
|
*
|
|
* Ask the filesystem for a file's attributes. The caller must indicate in
|
|
* request_mask and query_flags to indicate what they want.
|
|
*
|
|
* If the file is remote, the filesystem can be forced to update the attributes
|
|
* from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can
|
|
* suppress the update by passing AT_STATX_DONT_SYNC.
|
|
*
|
|
* Bits must have been set in request_mask to indicate which attributes the
|
|
* caller wants retrieving. Any such attribute not requested may be returned
|
|
* anyway, but the value may be approximate, and, if remote, may not have been
|
|
* synchronised with the server.
|
|
*
|
|
* 0 will be returned on success, and a -ve error code if unsuccessful.
|
|
*/
|
|
int vfs_getattr(const struct path *path, struct kstat *stat,
|
|
u32 request_mask, unsigned int query_flags)
|
|
{
|
|
int retval;
|
|
|
|
retval = security_inode_getattr(path);
|
|
if (retval)
|
|
return retval;
|
|
return vfs_getattr_nosec(path, stat, request_mask, query_flags);
|
|
}
|
|
EXPORT_SYMBOL(vfs_getattr);
|
|
|
|
/**
|
|
* vfs_fstat - Get the basic attributes by file descriptor
|
|
* @fd: The file descriptor referring to the file of interest
|
|
* @stat: The result structure to fill in.
|
|
*
|
|
* This function is a wrapper around vfs_getattr(). The main difference is
|
|
* that it uses a file descriptor to determine the file location.
|
|
*
|
|
* 0 will be returned on success, and a -ve error code if unsuccessful.
|
|
*/
|
|
int vfs_fstat(int fd, struct kstat *stat)
|
|
{
|
|
struct fd f;
|
|
int error;
|
|
|
|
f = fdget_raw(fd);
|
|
if (!f.file)
|
|
return -EBADF;
|
|
error = vfs_getattr(&f.file->f_path, stat, STATX_BASIC_STATS, 0);
|
|
fdput(f);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* vfs_statx - Get basic and extra attributes by filename
|
|
* @dfd: A file descriptor representing the base dir for a relative filename
|
|
* @filename: The name of the file of interest
|
|
* @flags: Flags to control the query
|
|
* @stat: The result structure to fill in.
|
|
* @request_mask: STATX_xxx flags indicating what the caller wants
|
|
*
|
|
* This function is a wrapper around vfs_getattr(). The main difference is
|
|
* that it uses a filename and base directory to determine the file location.
|
|
* Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
|
|
* at the given name from being referenced.
|
|
*
|
|
* 0 will be returned on success, and a -ve error code if unsuccessful.
|
|
*/
|
|
static int vfs_statx(int dfd, const char __user *filename, int flags,
|
|
struct kstat *stat, u32 request_mask)
|
|
{
|
|
struct path path;
|
|
unsigned lookup_flags = 0;
|
|
int error;
|
|
|
|
if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH |
|
|
AT_STATX_SYNC_TYPE))
|
|
return -EINVAL;
|
|
|
|
if (!(flags & AT_SYMLINK_NOFOLLOW))
|
|
lookup_flags |= LOOKUP_FOLLOW;
|
|
if (!(flags & AT_NO_AUTOMOUNT))
|
|
lookup_flags |= LOOKUP_AUTOMOUNT;
|
|
if (flags & AT_EMPTY_PATH)
|
|
lookup_flags |= LOOKUP_EMPTY;
|
|
|
|
retry:
|
|
error = user_path_at(dfd, filename, lookup_flags, &path);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = vfs_getattr(&path, stat, request_mask, flags);
|
|
stat->mnt_id = real_mount(path.mnt)->mnt_id;
|
|
stat->result_mask |= STATX_MNT_ID;
|
|
if (path.mnt->mnt_root == path.dentry)
|
|
stat->attributes |= STATX_ATTR_MOUNT_ROOT;
|
|
stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT;
|
|
path_put(&path);
|
|
if (retry_estale(error, lookup_flags)) {
|
|
lookup_flags |= LOOKUP_REVAL;
|
|
goto retry;
|
|
}
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
int vfs_fstatat(int dfd, const char __user *filename,
|
|
struct kstat *stat, int flags)
|
|
{
|
|
return vfs_statx(dfd, filename, flags | AT_NO_AUTOMOUNT,
|
|
stat, STATX_BASIC_STATS);
|
|
}
|
|
|
|
#ifdef __ARCH_WANT_OLD_STAT
|
|
|
|
/*
|
|
* For backward compatibility? Maybe this should be moved
|
|
* into arch/i386 instead?
|
|
*/
|
|
static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
|
|
{
|
|
static int warncount = 5;
|
|
struct __old_kernel_stat tmp;
|
|
|
|
if (warncount > 0) {
|
|
warncount--;
|
|
printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
|
|
current->comm);
|
|
} else if (warncount < 0) {
|
|
/* it's laughable, but... */
|
|
warncount = 0;
|
|
}
|
|
|
|
memset(&tmp, 0, sizeof(struct __old_kernel_stat));
|
|
tmp.st_dev = old_encode_dev(stat->dev);
|
|
tmp.st_ino = stat->ino;
|
|
if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
|
|
return -EOVERFLOW;
|
|
tmp.st_mode = stat->mode;
|
|
tmp.st_nlink = stat->nlink;
|
|
if (tmp.st_nlink != stat->nlink)
|
|
return -EOVERFLOW;
|
|
SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
|
|
SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
|
|
tmp.st_rdev = old_encode_dev(stat->rdev);
|
|
#if BITS_PER_LONG == 32
|
|
if (stat->size > MAX_NON_LFS)
|
|
return -EOVERFLOW;
|
|
#endif
|
|
tmp.st_size = stat->size;
|
|
tmp.st_atime = stat->atime.tv_sec;
|
|
tmp.st_mtime = stat->mtime.tv_sec;
|
|
tmp.st_ctime = stat->ctime.tv_sec;
|
|
return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(stat, const char __user *, filename,
|
|
struct __old_kernel_stat __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error;
|
|
|
|
error = vfs_stat(filename, &stat);
|
|
if (error)
|
|
return error;
|
|
|
|
return cp_old_stat(&stat, statbuf);
|
|
}
|
|
|
|
SYSCALL_DEFINE2(lstat, const char __user *, filename,
|
|
struct __old_kernel_stat __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error;
|
|
|
|
error = vfs_lstat(filename, &stat);
|
|
if (error)
|
|
return error;
|
|
|
|
return cp_old_stat(&stat, statbuf);
|
|
}
|
|
|
|
SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error = vfs_fstat(fd, &stat);
|
|
|
|
if (!error)
|
|
error = cp_old_stat(&stat, statbuf);
|
|
|
|
return error;
|
|
}
|
|
|
|
#endif /* __ARCH_WANT_OLD_STAT */
|
|
|
|
#ifdef __ARCH_WANT_NEW_STAT
|
|
|
|
#if BITS_PER_LONG == 32
|
|
# define choose_32_64(a,b) a
|
|
#else
|
|
# define choose_32_64(a,b) b
|
|
#endif
|
|
|
|
#define valid_dev(x) choose_32_64(old_valid_dev(x),true)
|
|
#define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
|
|
|
|
#ifndef INIT_STRUCT_STAT_PADDING
|
|
# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
|
|
#endif
|
|
|
|
static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
|
|
{
|
|
struct stat tmp;
|
|
|
|
if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
|
|
return -EOVERFLOW;
|
|
#if BITS_PER_LONG == 32
|
|
if (stat->size > MAX_NON_LFS)
|
|
return -EOVERFLOW;
|
|
#endif
|
|
|
|
INIT_STRUCT_STAT_PADDING(tmp);
|
|
tmp.st_dev = encode_dev(stat->dev);
|
|
tmp.st_ino = stat->ino;
|
|
if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
|
|
return -EOVERFLOW;
|
|
tmp.st_mode = stat->mode;
|
|
tmp.st_nlink = stat->nlink;
|
|
if (tmp.st_nlink != stat->nlink)
|
|
return -EOVERFLOW;
|
|
SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
|
|
SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
|
|
tmp.st_rdev = encode_dev(stat->rdev);
|
|
tmp.st_size = stat->size;
|
|
tmp.st_atime = stat->atime.tv_sec;
|
|
tmp.st_mtime = stat->mtime.tv_sec;
|
|
tmp.st_ctime = stat->ctime.tv_sec;
|
|
#ifdef STAT_HAVE_NSEC
|
|
tmp.st_atime_nsec = stat->atime.tv_nsec;
|
|
tmp.st_mtime_nsec = stat->mtime.tv_nsec;
|
|
tmp.st_ctime_nsec = stat->ctime.tv_nsec;
|
|
#endif
|
|
tmp.st_blocks = stat->blocks;
|
|
tmp.st_blksize = stat->blksize;
|
|
return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(newstat, const char __user *, filename,
|
|
struct stat __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error = vfs_stat(filename, &stat);
|
|
|
|
if (error)
|
|
return error;
|
|
return cp_new_stat(&stat, statbuf);
|
|
}
|
|
|
|
SYSCALL_DEFINE2(newlstat, const char __user *, filename,
|
|
struct stat __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error;
|
|
|
|
error = vfs_lstat(filename, &stat);
|
|
if (error)
|
|
return error;
|
|
|
|
return cp_new_stat(&stat, statbuf);
|
|
}
|
|
|
|
#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
|
|
SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
|
|
struct stat __user *, statbuf, int, flag)
|
|
{
|
|
struct kstat stat;
|
|
int error;
|
|
|
|
error = vfs_fstatat(dfd, filename, &stat, flag);
|
|
if (error)
|
|
return error;
|
|
return cp_new_stat(&stat, statbuf);
|
|
}
|
|
#endif
|
|
|
|
SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error = vfs_fstat(fd, &stat);
|
|
|
|
if (!error)
|
|
error = cp_new_stat(&stat, statbuf);
|
|
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
static int do_readlinkat(int dfd, const char __user *pathname,
|
|
char __user *buf, int bufsiz)
|
|
{
|
|
struct path path;
|
|
int error;
|
|
int empty = 0;
|
|
unsigned int lookup_flags = LOOKUP_EMPTY;
|
|
|
|
if (bufsiz <= 0)
|
|
return -EINVAL;
|
|
|
|
retry:
|
|
error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
|
|
if (!error) {
|
|
struct inode *inode = d_backing_inode(path.dentry);
|
|
|
|
error = empty ? -ENOENT : -EINVAL;
|
|
/*
|
|
* AFS mountpoints allow readlink(2) but are not symlinks
|
|
*/
|
|
if (d_is_symlink(path.dentry) || inode->i_op->readlink) {
|
|
error = security_inode_readlink(path.dentry);
|
|
if (!error) {
|
|
touch_atime(&path);
|
|
error = vfs_readlink(path.dentry, buf, bufsiz);
|
|
}
|
|
}
|
|
path_put(&path);
|
|
if (retry_estale(error, lookup_flags)) {
|
|
lookup_flags |= LOOKUP_REVAL;
|
|
goto retry;
|
|
}
|
|
}
|
|
return error;
|
|
}
|
|
|
|
SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
|
|
char __user *, buf, int, bufsiz)
|
|
{
|
|
return do_readlinkat(dfd, pathname, buf, bufsiz);
|
|
}
|
|
|
|
SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
|
|
int, bufsiz)
|
|
{
|
|
return do_readlinkat(AT_FDCWD, path, buf, bufsiz);
|
|
}
|
|
|
|
|
|
/* ---------- LFS-64 ----------- */
|
|
#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
|
|
|
|
#ifndef INIT_STRUCT_STAT64_PADDING
|
|
# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
|
|
#endif
|
|
|
|
static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
|
|
{
|
|
struct stat64 tmp;
|
|
|
|
INIT_STRUCT_STAT64_PADDING(tmp);
|
|
#ifdef CONFIG_MIPS
|
|
/* mips has weird padding, so we don't get 64 bits there */
|
|
tmp.st_dev = new_encode_dev(stat->dev);
|
|
tmp.st_rdev = new_encode_dev(stat->rdev);
|
|
#else
|
|
tmp.st_dev = huge_encode_dev(stat->dev);
|
|
tmp.st_rdev = huge_encode_dev(stat->rdev);
|
|
#endif
|
|
tmp.st_ino = stat->ino;
|
|
if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
|
|
return -EOVERFLOW;
|
|
#ifdef STAT64_HAS_BROKEN_ST_INO
|
|
tmp.__st_ino = stat->ino;
|
|
#endif
|
|
tmp.st_mode = stat->mode;
|
|
tmp.st_nlink = stat->nlink;
|
|
tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
|
|
tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
|
|
tmp.st_atime = stat->atime.tv_sec;
|
|
tmp.st_atime_nsec = stat->atime.tv_nsec;
|
|
tmp.st_mtime = stat->mtime.tv_sec;
|
|
tmp.st_mtime_nsec = stat->mtime.tv_nsec;
|
|
tmp.st_ctime = stat->ctime.tv_sec;
|
|
tmp.st_ctime_nsec = stat->ctime.tv_nsec;
|
|
tmp.st_size = stat->size;
|
|
tmp.st_blocks = stat->blocks;
|
|
tmp.st_blksize = stat->blksize;
|
|
return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(stat64, const char __user *, filename,
|
|
struct stat64 __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error = vfs_stat(filename, &stat);
|
|
|
|
if (!error)
|
|
error = cp_new_stat64(&stat, statbuf);
|
|
|
|
return error;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(lstat64, const char __user *, filename,
|
|
struct stat64 __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error = vfs_lstat(filename, &stat);
|
|
|
|
if (!error)
|
|
error = cp_new_stat64(&stat, statbuf);
|
|
|
|
return error;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error = vfs_fstat(fd, &stat);
|
|
|
|
if (!error)
|
|
error = cp_new_stat64(&stat, statbuf);
|
|
|
|
return error;
|
|
}
|
|
|
|
SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
|
|
struct stat64 __user *, statbuf, int, flag)
|
|
{
|
|
struct kstat stat;
|
|
int error;
|
|
|
|
error = vfs_fstatat(dfd, filename, &stat, flag);
|
|
if (error)
|
|
return error;
|
|
return cp_new_stat64(&stat, statbuf);
|
|
}
|
|
#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
|
|
|
|
static noinline_for_stack int
|
|
cp_statx(const struct kstat *stat, struct statx __user *buffer)
|
|
{
|
|
struct statx tmp;
|
|
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
|
|
tmp.stx_mask = stat->result_mask;
|
|
tmp.stx_blksize = stat->blksize;
|
|
tmp.stx_attributes = stat->attributes;
|
|
tmp.stx_nlink = stat->nlink;
|
|
tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid);
|
|
tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid);
|
|
tmp.stx_mode = stat->mode;
|
|
tmp.stx_ino = stat->ino;
|
|
tmp.stx_size = stat->size;
|
|
tmp.stx_blocks = stat->blocks;
|
|
tmp.stx_attributes_mask = stat->attributes_mask;
|
|
tmp.stx_atime.tv_sec = stat->atime.tv_sec;
|
|
tmp.stx_atime.tv_nsec = stat->atime.tv_nsec;
|
|
tmp.stx_btime.tv_sec = stat->btime.tv_sec;
|
|
tmp.stx_btime.tv_nsec = stat->btime.tv_nsec;
|
|
tmp.stx_ctime.tv_sec = stat->ctime.tv_sec;
|
|
tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec;
|
|
tmp.stx_mtime.tv_sec = stat->mtime.tv_sec;
|
|
tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec;
|
|
tmp.stx_rdev_major = MAJOR(stat->rdev);
|
|
tmp.stx_rdev_minor = MINOR(stat->rdev);
|
|
tmp.stx_dev_major = MAJOR(stat->dev);
|
|
tmp.stx_dev_minor = MINOR(stat->dev);
|
|
tmp.stx_mnt_id = stat->mnt_id;
|
|
|
|
return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
|
|
}
|
|
|
|
int do_statx(int dfd, const char __user *filename, unsigned flags,
|
|
unsigned int mask, struct statx __user *buffer)
|
|
{
|
|
struct kstat stat;
|
|
int error;
|
|
|
|
if (mask & STATX__RESERVED)
|
|
return -EINVAL;
|
|
if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
|
|
return -EINVAL;
|
|
|
|
error = vfs_statx(dfd, filename, flags, &stat, mask);
|
|
if (error)
|
|
return error;
|
|
|
|
return cp_statx(&stat, buffer);
|
|
}
|
|
|
|
/**
|
|
* sys_statx - System call to get enhanced stats
|
|
* @dfd: Base directory to pathwalk from *or* fd to stat.
|
|
* @filename: File to stat or "" with AT_EMPTY_PATH
|
|
* @flags: AT_* flags to control pathwalk.
|
|
* @mask: Parts of statx struct actually required.
|
|
* @buffer: Result buffer.
|
|
*
|
|
* Note that fstat() can be emulated by setting dfd to the fd of interest,
|
|
* supplying "" as the filename and setting AT_EMPTY_PATH in the flags.
|
|
*/
|
|
SYSCALL_DEFINE5(statx,
|
|
int, dfd, const char __user *, filename, unsigned, flags,
|
|
unsigned int, mask,
|
|
struct statx __user *, buffer)
|
|
{
|
|
return do_statx(dfd, filename, flags, mask, buffer);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
|
|
{
|
|
struct compat_stat tmp;
|
|
|
|
if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
|
|
return -EOVERFLOW;
|
|
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
tmp.st_dev = old_encode_dev(stat->dev);
|
|
tmp.st_ino = stat->ino;
|
|
if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
|
|
return -EOVERFLOW;
|
|
tmp.st_mode = stat->mode;
|
|
tmp.st_nlink = stat->nlink;
|
|
if (tmp.st_nlink != stat->nlink)
|
|
return -EOVERFLOW;
|
|
SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
|
|
SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
|
|
tmp.st_rdev = old_encode_dev(stat->rdev);
|
|
if ((u64) stat->size > MAX_NON_LFS)
|
|
return -EOVERFLOW;
|
|
tmp.st_size = stat->size;
|
|
tmp.st_atime = stat->atime.tv_sec;
|
|
tmp.st_atime_nsec = stat->atime.tv_nsec;
|
|
tmp.st_mtime = stat->mtime.tv_sec;
|
|
tmp.st_mtime_nsec = stat->mtime.tv_nsec;
|
|
tmp.st_ctime = stat->ctime.tv_sec;
|
|
tmp.st_ctime_nsec = stat->ctime.tv_nsec;
|
|
tmp.st_blocks = stat->blocks;
|
|
tmp.st_blksize = stat->blksize;
|
|
return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
|
|
struct compat_stat __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error;
|
|
|
|
error = vfs_stat(filename, &stat);
|
|
if (error)
|
|
return error;
|
|
return cp_compat_stat(&stat, statbuf);
|
|
}
|
|
|
|
COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
|
|
struct compat_stat __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error;
|
|
|
|
error = vfs_lstat(filename, &stat);
|
|
if (error)
|
|
return error;
|
|
return cp_compat_stat(&stat, statbuf);
|
|
}
|
|
|
|
#ifndef __ARCH_WANT_STAT64
|
|
COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
|
|
const char __user *, filename,
|
|
struct compat_stat __user *, statbuf, int, flag)
|
|
{
|
|
struct kstat stat;
|
|
int error;
|
|
|
|
error = vfs_fstatat(dfd, filename, &stat, flag);
|
|
if (error)
|
|
return error;
|
|
return cp_compat_stat(&stat, statbuf);
|
|
}
|
|
#endif
|
|
|
|
COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
|
|
struct compat_stat __user *, statbuf)
|
|
{
|
|
struct kstat stat;
|
|
int error = vfs_fstat(fd, &stat);
|
|
|
|
if (!error)
|
|
error = cp_compat_stat(&stat, statbuf);
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
|
|
void __inode_add_bytes(struct inode *inode, loff_t bytes)
|
|
{
|
|
inode->i_blocks += bytes >> 9;
|
|
bytes &= 511;
|
|
inode->i_bytes += bytes;
|
|
if (inode->i_bytes >= 512) {
|
|
inode->i_blocks++;
|
|
inode->i_bytes -= 512;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(__inode_add_bytes);
|
|
|
|
void inode_add_bytes(struct inode *inode, loff_t bytes)
|
|
{
|
|
spin_lock(&inode->i_lock);
|
|
__inode_add_bytes(inode, bytes);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
EXPORT_SYMBOL(inode_add_bytes);
|
|
|
|
void __inode_sub_bytes(struct inode *inode, loff_t bytes)
|
|
{
|
|
inode->i_blocks -= bytes >> 9;
|
|
bytes &= 511;
|
|
if (inode->i_bytes < bytes) {
|
|
inode->i_blocks--;
|
|
inode->i_bytes += 512;
|
|
}
|
|
inode->i_bytes -= bytes;
|
|
}
|
|
|
|
EXPORT_SYMBOL(__inode_sub_bytes);
|
|
|
|
void inode_sub_bytes(struct inode *inode, loff_t bytes)
|
|
{
|
|
spin_lock(&inode->i_lock);
|
|
__inode_sub_bytes(inode, bytes);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
EXPORT_SYMBOL(inode_sub_bytes);
|
|
|
|
loff_t inode_get_bytes(struct inode *inode)
|
|
{
|
|
loff_t ret;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
ret = __inode_get_bytes(inode);
|
|
spin_unlock(&inode->i_lock);
|
|
return ret;
|
|
}
|
|
|
|
EXPORT_SYMBOL(inode_get_bytes);
|
|
|
|
void inode_set_bytes(struct inode *inode, loff_t bytes)
|
|
{
|
|
/* Caller is here responsible for sufficient locking
|
|
* (ie. inode->i_lock) */
|
|
inode->i_blocks = bytes >> 9;
|
|
inode->i_bytes = bytes & 511;
|
|
}
|
|
|
|
EXPORT_SYMBOL(inode_set_bytes);
|