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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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static int flags_by_mnt(int mnt_flags){ int flags = 0;
if (mnt_flags & MNT_READONLY) flags |= ST_RDONLY; if (mnt_flags & MNT_NOSUID) flags |= ST_NOSUID; if (mnt_flags & MNT_NODEV) flags |= ST_NODEV; if (mnt_flags & MNT_NOEXEC) flags |= ST_NOEXEC; if (mnt_flags & MNT_NOATIME) flags |= ST_NOATIME; if (mnt_flags & MNT_NODIRATIME) flags |= ST_NODIRATIME; if (mnt_flags & MNT_RELATIME) flags |= ST_RELATIME; if (mnt_flags & MNT_NOSYMFOLLOW) flags |= ST_NOSYMFOLLOW; return flags;}
static int flags_by_sb(int s_flags){ int flags = 0; if (s_flags & SB_SYNCHRONOUS) flags |= ST_SYNCHRONOUS; if (s_flags & SB_MANDLOCK) flags |= ST_MANDLOCK; if (s_flags & SB_RDONLY) flags |= ST_RDONLY; return flags;}
static int calculate_f_flags(struct vfsmount *mnt){ return ST_VALID | flags_by_mnt(mnt->mnt_flags) | flags_by_sb(mnt->mnt_sb->s_flags);}
static int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf){ int retval;
if (!dentry->d_sb->s_op->statfs) return -ENOSYS;
memset(buf, 0, sizeof(*buf)); retval = security_sb_statfs(dentry); if (retval) return retval; retval = dentry->d_sb->s_op->statfs(dentry, buf); if (retval == 0 && buf->f_frsize == 0) buf->f_frsize = buf->f_bsize; return retval;}
int vfs_get_fsid(struct dentry *dentry, __kernel_fsid_t *fsid){ struct kstatfs st; int error;
error = statfs_by_dentry(dentry, &st); if (error) return error;
*fsid = st.f_fsid; return 0;}EXPORT_SYMBOL(vfs_get_fsid);
int vfs_statfs(const struct path *path, struct kstatfs *buf){ int error;
error = statfs_by_dentry(path->dentry, buf); if (!error) buf->f_flags = calculate_f_flags(path->mnt); return error;}EXPORT_SYMBOL(vfs_statfs);
int user_statfs(const char __user *pathname, struct kstatfs *st){ struct path path; int error; unsigned int lookup_flags = LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT; CLASS(filename, name)(pathname);retry: error = filename_lookup(AT_FDCWD, name, lookup_flags, &path, NULL); if (!error) { error = vfs_statfs(&path, st); path_put(&path); if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; } } return error;}
int fd_statfs(int fd, struct kstatfs *st){ CLASS(fd_raw, f)(fd);
if (fd_empty(f)) return -EBADF; return vfs_statfs(&fd_file(f)->f_path, st);}
static int do_statfs_native(struct kstatfs *st, struct statfs __user *p){ struct statfs buf;
if (sizeof(buf) == sizeof(*st)) memcpy(&buf, st, sizeof(*st)); else { memset(&buf, 0, sizeof(buf)); if (sizeof buf.f_blocks == 4) { if ((st->f_blocks | st->f_bfree | st->f_bavail | st->f_bsize | st->f_frsize) & 0xffffffff00000000ULL) return -EOVERFLOW; /* * f_files and f_ffree may be -1; it's okay to stuff * that into 32 bits */ if (st->f_files != -1 && (st->f_files & 0xffffffff00000000ULL)) return -EOVERFLOW; if (st->f_ffree != -1 && (st->f_ffree & 0xffffffff00000000ULL)) return -EOVERFLOW; }
buf.f_type = st->f_type; buf.f_bsize = st->f_bsize; buf.f_blocks = st->f_blocks; buf.f_bfree = st->f_bfree; buf.f_bavail = st->f_bavail; buf.f_files = st->f_files; buf.f_ffree = st->f_ffree; buf.f_fsid = st->f_fsid; buf.f_namelen = st->f_namelen; buf.f_frsize = st->f_frsize; buf.f_flags = st->f_flags; } if (copy_to_user(p, &buf, sizeof(buf))) return -EFAULT; return 0;}
static int do_statfs64(struct kstatfs *st, struct statfs64 __user *p){ struct statfs64 buf; if (sizeof(buf) == sizeof(*st)) memcpy(&buf, st, sizeof(*st)); else { memset(&buf, 0, sizeof(buf)); buf.f_type = st->f_type; buf.f_bsize = st->f_bsize; buf.f_blocks = st->f_blocks; buf.f_bfree = st->f_bfree; buf.f_bavail = st->f_bavail; buf.f_files = st->f_files; buf.f_ffree = st->f_ffree; buf.f_fsid = st->f_fsid; buf.f_namelen = st->f_namelen; buf.f_frsize = st->f_frsize; buf.f_flags = st->f_flags; } if (copy_to_user(p, &buf, sizeof(buf))) return -EFAULT; return 0;}
SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, buf){ struct kstatfs st; int error = user_statfs(pathname, &st); if (!error) error = do_statfs_native(&st, buf); return error;}
SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct statfs64 __user *, buf){ struct kstatfs st; int error; if (sz != sizeof(*buf)) return -EINVAL; error = user_statfs(pathname, &st); if (!error) error = do_statfs64(&st, buf); return error;}
SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf){ struct kstatfs st; int error = fd_statfs(fd, &st); if (!error) error = do_statfs_native(&st, buf); return error;}
SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf){ struct kstatfs st; int error;
if (sz != sizeof(*buf)) return -EINVAL;
error = fd_statfs(fd, &st); if (!error) error = do_statfs64(&st, buf); return error;}
static int vfs_ustat(dev_t dev, struct kstatfs *sbuf){ struct super_block *s = user_get_super(dev, false); int err; if (!s) return -EINVAL;
err = statfs_by_dentry(s->s_root, sbuf); drop_super(s); return err;}
SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf){ struct ustat tmp; struct kstatfs sbuf; int err = vfs_ustat(new_decode_dev(dev), &sbuf); if (err) return err;
memset(&tmp,0,sizeof(struct ustat)); tmp.f_tfree = sbuf.f_bfree; if (IS_ENABLED(CONFIG_ARCH_32BIT_USTAT_F_TINODE)) tmp.f_tinode = min_t(u64, sbuf.f_ffree, UINT_MAX); else tmp.f_tinode = sbuf.f_ffree;
return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0;}
#ifdef CONFIG_COMPATstatic int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf){ struct compat_statfs buf; if (sizeof ubuf->f_blocks == 4) { if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail | kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL) return -EOVERFLOW; /* f_files and f_ffree may be -1; it's okay * to stuff that into 32 bits */ if (kbuf->f_files != 0xffffffffffffffffULL && (kbuf->f_files & 0xffffffff00000000ULL)) return -EOVERFLOW; if (kbuf->f_ffree != 0xffffffffffffffffULL && (kbuf->f_ffree & 0xffffffff00000000ULL)) return -EOVERFLOW; } memset(&buf, 0, sizeof(struct compat_statfs)); buf.f_type = kbuf->f_type; buf.f_bsize = kbuf->f_bsize; buf.f_blocks = kbuf->f_blocks; buf.f_bfree = kbuf->f_bfree; buf.f_bavail = kbuf->f_bavail; buf.f_files = kbuf->f_files; buf.f_ffree = kbuf->f_ffree; buf.f_namelen = kbuf->f_namelen; buf.f_fsid.val[0] = kbuf->f_fsid.val[0]; buf.f_fsid.val[1] = kbuf->f_fsid.val[1]; buf.f_frsize = kbuf->f_frsize; buf.f_flags = kbuf->f_flags; if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs))) return -EFAULT; return 0;}
/* * The following statfs calls are copies of code from fs/statfs.c and * should be checked against those from time to time */COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf){ struct kstatfs tmp; int error = user_statfs(pathname, &tmp); if (!error) error = put_compat_statfs(buf, &tmp); return error;}
COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf){ struct kstatfs tmp; int error = fd_statfs(fd, &tmp); if (!error) error = put_compat_statfs(buf, &tmp); return error;}
static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf){ struct compat_statfs64 buf;
if ((kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL) return -EOVERFLOW;
memset(&buf, 0, sizeof(struct compat_statfs64)); buf.f_type = kbuf->f_type; buf.f_bsize = kbuf->f_bsize; buf.f_blocks = kbuf->f_blocks; buf.f_bfree = kbuf->f_bfree; buf.f_bavail = kbuf->f_bavail; buf.f_files = kbuf->f_files; buf.f_ffree = kbuf->f_ffree; buf.f_namelen = kbuf->f_namelen; buf.f_fsid.val[0] = kbuf->f_fsid.val[0]; buf.f_fsid.val[1] = kbuf->f_fsid.val[1]; buf.f_frsize = kbuf->f_frsize; buf.f_flags = kbuf->f_flags; if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs64))) return -EFAULT; return 0;}
int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz, struct compat_statfs64 __user * buf){ struct kstatfs tmp; int error;
if (sz != sizeof(*buf)) return -EINVAL;
error = user_statfs(pathname, &tmp); if (!error) error = put_compat_statfs64(buf, &tmp); return error;}
COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf){ return kcompat_sys_statfs64(pathname, sz, buf);}
int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user * buf){ struct kstatfs tmp; int error;
if (sz != sizeof(*buf)) return -EINVAL;
error = fd_statfs(fd, &tmp); if (!error) error = put_compat_statfs64(buf, &tmp); return error;}
COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf){ return kcompat_sys_fstatfs64(fd, sz, buf);}
/* * This is a copy of sys_ustat, just dealing with a structure layout. * Given how simple this syscall is that apporach is more maintainable * than the various conversion hacks. */COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u){ struct compat_ustat tmp; struct kstatfs sbuf; int err = vfs_ustat(new_decode_dev(dev), &sbuf); if (err) return err;
memset(&tmp, 0, sizeof(struct compat_ustat)); tmp.f_tfree = sbuf.f_bfree; tmp.f_tinode = sbuf.f_ffree; if (copy_to_user(u, &tmp, sizeof(struct compat_ustat))) return -EFAULT; return 0;}#endif