Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/statfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) static int flags_by_mnt(int mnt_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	int flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	if (mnt_flags & MNT_READONLY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 		flags |= ST_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	if (mnt_flags & MNT_NOSUID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 		flags |= ST_NOSUID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	if (mnt_flags & MNT_NODEV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 		flags |= ST_NODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	if (mnt_flags & MNT_NOEXEC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 		flags |= ST_NOEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	if (mnt_flags & MNT_NOATIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 		flags |= ST_NOATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	if (mnt_flags & MNT_NODIRATIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 		flags |= ST_NODIRATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	if (mnt_flags & MNT_RELATIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 		flags |= ST_RELATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	if (mnt_flags & MNT_NOSYMFOLLOW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		flags |= ST_NOSYMFOLLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	return flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static int flags_by_sb(int s_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	int flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	if (s_flags & SB_SYNCHRONOUS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		flags |= ST_SYNCHRONOUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	if (s_flags & SB_MANDLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		flags |= ST_MANDLOCK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	if (s_flags & SB_RDONLY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		flags |= ST_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	return flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) static int calculate_f_flags(struct vfsmount *mnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	return ST_VALID | flags_by_mnt(mnt->mnt_flags) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		flags_by_sb(mnt->mnt_sb->s_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) static int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	if (!dentry->d_sb->s_op->statfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	memset(buf, 0, sizeof(*buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	retval = security_sb_statfs(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	retval = dentry->d_sb->s_op->statfs(dentry, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (retval == 0 && buf->f_frsize == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		buf->f_frsize = buf->f_bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) int vfs_get_fsid(struct dentry *dentry, __kernel_fsid_t *fsid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	struct kstatfs st;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	error = statfs_by_dentry(dentry, &st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	*fsid = st.f_fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) EXPORT_SYMBOL(vfs_get_fsid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) int vfs_statfs(const struct path *path, struct kstatfs *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	error = statfs_by_dentry(path->dentry, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		buf->f_flags = calculate_f_flags(path->mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) EXPORT_SYMBOL(vfs_statfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) int user_statfs(const char __user *pathname, struct kstatfs *st)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	unsigned int lookup_flags = LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	if (!error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		error = vfs_statfs(&path, st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		path_put(&path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		if (retry_estale(error, lookup_flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			lookup_flags |= LOOKUP_REVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) int fd_statfs(int fd, struct kstatfs *st)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	struct fd f = fdget_raw(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	int error = -EBADF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (f.file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		error = vfs_statfs(&f.file->f_path, st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		fdput(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int do_statfs_native(struct kstatfs *st, struct statfs __user *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	struct statfs buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (sizeof(buf) == sizeof(*st))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		memcpy(&buf, st, sizeof(*st));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		if (sizeof buf.f_blocks == 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 			if ((st->f_blocks | st->f_bfree | st->f_bavail |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 			     st->f_bsize | st->f_frsize) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			    0xffffffff00000000ULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 				return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			 * f_files and f_ffree may be -1; it's okay to stuff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			 * that into 32 bits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			if (st->f_files != -1 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			    (st->f_files & 0xffffffff00000000ULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 				return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			if (st->f_ffree != -1 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			    (st->f_ffree & 0xffffffff00000000ULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 				return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		buf.f_type = st->f_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		buf.f_bsize = st->f_bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		buf.f_blocks = st->f_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		buf.f_bfree = st->f_bfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		buf.f_bavail = st->f_bavail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		buf.f_files = st->f_files;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		buf.f_ffree = st->f_ffree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		buf.f_fsid = st->f_fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		buf.f_namelen = st->f_namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		buf.f_frsize = st->f_frsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		buf.f_flags = st->f_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		memset(buf.f_spare, 0, sizeof(buf.f_spare));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (copy_to_user(p, &buf, sizeof(buf)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static int do_statfs64(struct kstatfs *st, struct statfs64 __user *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	struct statfs64 buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (sizeof(buf) == sizeof(*st))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		memcpy(&buf, st, sizeof(*st));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		buf.f_type = st->f_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		buf.f_bsize = st->f_bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		buf.f_blocks = st->f_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		buf.f_bfree = st->f_bfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		buf.f_bavail = st->f_bavail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		buf.f_files = st->f_files;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		buf.f_ffree = st->f_ffree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		buf.f_fsid = st->f_fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		buf.f_namelen = st->f_namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		buf.f_frsize = st->f_frsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		buf.f_flags = st->f_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		memset(buf.f_spare, 0, sizeof(buf.f_spare));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (copy_to_user(p, &buf, sizeof(buf)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	struct kstatfs st;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	int error = user_statfs(pathname, &st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		error = do_statfs_native(&st, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct statfs64 __user *, buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	struct kstatfs st;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	if (sz != sizeof(*buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	error = user_statfs(pathname, &st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		error = do_statfs64(&st, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	struct kstatfs st;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	int error = fd_statfs(fd, &st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		error = do_statfs_native(&st, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	struct kstatfs st;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	if (sz != sizeof(*buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	error = fd_statfs(fd, &st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		error = do_statfs64(&st, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static int vfs_ustat(dev_t dev, struct kstatfs *sbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	struct super_block *s = user_get_super(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	if (!s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	err = statfs_by_dentry(s->s_root, sbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	drop_super(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	struct ustat tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	struct kstatfs sbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	memset(&tmp,0,sizeof(struct ustat));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	tmp.f_tfree = sbuf.f_bfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	tmp.f_tinode = sbuf.f_ffree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	struct compat_statfs buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (sizeof ubuf->f_blocks == 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		     kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		/* f_files and f_ffree may be -1; it's okay
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		 * to stuff that into 32 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		if (kbuf->f_files != 0xffffffffffffffffULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		 && (kbuf->f_files & 0xffffffff00000000ULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		if (kbuf->f_ffree != 0xffffffffffffffffULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		 && (kbuf->f_ffree & 0xffffffff00000000ULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 			return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	memset(&buf, 0, sizeof(struct compat_statfs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	buf.f_type = kbuf->f_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	buf.f_bsize = kbuf->f_bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	buf.f_blocks = kbuf->f_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	buf.f_bfree = kbuf->f_bfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	buf.f_bavail = kbuf->f_bavail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	buf.f_files = kbuf->f_files;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	buf.f_ffree = kbuf->f_ffree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	buf.f_namelen = kbuf->f_namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	buf.f_frsize = kbuf->f_frsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	buf.f_flags = kbuf->f_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)  * The following statfs calls are copies of code from fs/statfs.c and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)  * should be checked against those from time to time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	struct kstatfs tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	int error = user_statfs(pathname, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		error = put_compat_statfs(buf, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	struct kstatfs tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	int error = fd_statfs(fd, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		error = put_compat_statfs(buf, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	struct compat_statfs64 buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	if ((kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	memset(&buf, 0, sizeof(struct compat_statfs64));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	buf.f_type = kbuf->f_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	buf.f_bsize = kbuf->f_bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	buf.f_blocks = kbuf->f_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	buf.f_bfree = kbuf->f_bfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	buf.f_bavail = kbuf->f_bavail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	buf.f_files = kbuf->f_files;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	buf.f_ffree = kbuf->f_ffree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	buf.f_namelen = kbuf->f_namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	buf.f_fsid.val[0] = kbuf->f_fsid.val[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	buf.f_fsid.val[1] = kbuf->f_fsid.val[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	buf.f_frsize = kbuf->f_frsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	buf.f_flags = kbuf->f_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	if (copy_to_user(ubuf, &buf, sizeof(struct compat_statfs64)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) int kcompat_sys_statfs64(const char __user * pathname, compat_size_t sz, struct compat_statfs64 __user * buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	struct kstatfs tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	if (sz != sizeof(*buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	error = user_statfs(pathname, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		error = put_compat_statfs64(buf, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	return kcompat_sys_statfs64(pathname, sz, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) int kcompat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user * buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	struct kstatfs tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	if (sz != sizeof(*buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	error = fd_statfs(fd, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		error = put_compat_statfs64(buf, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	return kcompat_sys_fstatfs64(fd, sz, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)  * This is a copy of sys_ustat, just dealing with a structure layout.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)  * Given how simple this syscall is that apporach is more maintainable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)  * than the various conversion hacks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	struct compat_ustat tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	struct kstatfs sbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	int err = vfs_ustat(new_decode_dev(dev), &sbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	memset(&tmp, 0, sizeof(struct compat_ustat));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	tmp.f_tfree = sbuf.f_bfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	tmp.f_tinode = sbuf.f_ffree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) #endif