cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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coda_linux.c (5286B)


      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Inode operations for Coda filesystem
      4 * Original version: (C) 1996 P. Braam and M. Callahan
      5 * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
      6 * 
      7 * Carnegie Mellon encourages users to contribute improvements to
      8 * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
      9 */
     10
     11#include <linux/types.h>
     12#include <linux/kernel.h>
     13#include <linux/time.h>
     14#include <linux/fs.h>
     15#include <linux/stat.h>
     16#include <linux/errno.h>
     17#include <linux/uaccess.h>
     18#include <linux/string.h>
     19
     20#include <linux/coda.h>
     21#include "coda_psdev.h"
     22#include "coda_linux.h"
     23
     24/* initialize the debugging variables */
     25int coda_fake_statfs;
     26
     27/* print a fid */
     28char * coda_f2s(struct CodaFid *f)
     29{
     30	static char s[60];
     31
     32 	sprintf(s, "(%08x.%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2], f->opaque[3]);
     33
     34	return s;
     35}
     36
     37/* recognize special .CONTROL name */
     38int coda_iscontrol(const char *name, size_t length)
     39{
     40	return ((CODA_CONTROLLEN == length) && 
     41                (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));
     42}
     43
     44unsigned short coda_flags_to_cflags(unsigned short flags)
     45{
     46	unsigned short coda_flags = 0;
     47	
     48	if ((flags & O_ACCMODE) == O_RDONLY)
     49		coda_flags |= C_O_READ;
     50
     51	if ((flags & O_ACCMODE) == O_RDWR)
     52		coda_flags |= C_O_READ | C_O_WRITE;
     53
     54	if ((flags & O_ACCMODE) == O_WRONLY)
     55		coda_flags |= C_O_WRITE;
     56
     57	if (flags & O_TRUNC)
     58		coda_flags |= C_O_TRUNC;
     59
     60	if (flags & O_CREAT)
     61		coda_flags |= C_O_CREAT;
     62
     63	if (flags & O_EXCL)
     64		coda_flags |= C_O_EXCL;
     65
     66	return coda_flags;
     67}
     68
     69static struct timespec64 coda_to_timespec64(struct coda_timespec ts)
     70{
     71	struct timespec64 ts64 = {
     72		.tv_sec = ts.tv_sec,
     73		.tv_nsec = ts.tv_nsec,
     74	};
     75
     76	return ts64;
     77}
     78
     79static struct coda_timespec timespec64_to_coda(struct timespec64 ts64)
     80{
     81	struct coda_timespec ts = {
     82		.tv_sec = ts64.tv_sec,
     83		.tv_nsec = ts64.tv_nsec,
     84	};
     85
     86	return ts;
     87}
     88
     89/* utility functions below */
     90umode_t coda_inode_type(struct coda_vattr *attr)
     91{
     92	switch (attr->va_type) {
     93	case C_VREG:
     94		return S_IFREG;
     95	case C_VDIR:
     96		return S_IFDIR;
     97	case C_VLNK:
     98		return S_IFLNK;
     99	case C_VNON:
    100	default:
    101		return 0;
    102	}
    103}
    104
    105void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
    106{
    107	/* inode's i_flags, i_ino are set by iget
    108	 * XXX: is this all we need ??
    109	 */
    110	umode_t inode_type = coda_inode_type(attr);
    111	inode->i_mode |= inode_type;
    112
    113	if (attr->va_mode != (u_short) -1)
    114	        inode->i_mode = attr->va_mode | inode_type;
    115        if (attr->va_uid != -1) 
    116	        inode->i_uid = make_kuid(&init_user_ns, (uid_t) attr->va_uid);
    117        if (attr->va_gid != -1)
    118	        inode->i_gid = make_kgid(&init_user_ns, (gid_t) attr->va_gid);
    119	if (attr->va_nlink != -1)
    120		set_nlink(inode, attr->va_nlink);
    121	if (attr->va_size != -1)
    122	        inode->i_size = attr->va_size;
    123	if (attr->va_size != -1)
    124		inode->i_blocks = (attr->va_size + 511) >> 9;
    125	if (attr->va_atime.tv_sec != -1) 
    126		inode->i_atime = coda_to_timespec64(attr->va_atime);
    127	if (attr->va_mtime.tv_sec != -1)
    128		inode->i_mtime = coda_to_timespec64(attr->va_mtime);
    129        if (attr->va_ctime.tv_sec != -1)
    130		inode->i_ctime = coda_to_timespec64(attr->va_ctime);
    131}
    132
    133
    134/* 
    135 * BSD sets attributes that need not be modified to -1. 
    136 * Linux uses the valid field to indicate what should be
    137 * looked at.  The BSD type field needs to be deduced from linux 
    138 * mode.
    139 * So we have to do some translations here.
    140 */
    141
    142void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
    143{
    144        unsigned int valid;
    145
    146        /* clean out */        
    147	vattr->va_mode = -1;
    148        vattr->va_uid = (vuid_t) -1; 
    149        vattr->va_gid = (vgid_t) -1;
    150        vattr->va_size = (off_t) -1;
    151	vattr->va_atime.tv_sec = (int64_t) -1;
    152	vattr->va_atime.tv_nsec = (long) -1;
    153	vattr->va_mtime.tv_sec = (int64_t) -1;
    154	vattr->va_mtime.tv_nsec = (long) -1;
    155	vattr->va_ctime.tv_sec = (int64_t) -1;
    156	vattr->va_ctime.tv_nsec = (long) -1;
    157        vattr->va_type = C_VNON;
    158	vattr->va_fileid = -1;
    159	vattr->va_gen = -1;
    160	vattr->va_bytes = -1;
    161	vattr->va_nlink = -1;
    162	vattr->va_blocksize = -1;
    163	vattr->va_rdev = -1;
    164        vattr->va_flags = 0;
    165
    166        /* determine the type */
    167#if 0
    168        mode = iattr->ia_mode;
    169                if ( S_ISDIR(mode) ) {
    170                vattr->va_type = C_VDIR; 
    171        } else if ( S_ISREG(mode) ) {
    172                vattr->va_type = C_VREG;
    173        } else if ( S_ISLNK(mode) ) {
    174                vattr->va_type = C_VLNK;
    175        } else {
    176                /* don't do others */
    177                vattr->va_type = C_VNON;
    178        }
    179#endif 
    180
    181        /* set those vattrs that need change */
    182        valid = iattr->ia_valid;
    183        if ( valid & ATTR_MODE ) {
    184                vattr->va_mode = iattr->ia_mode;
    185	}
    186        if ( valid & ATTR_UID ) {
    187                vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid);
    188	}
    189        if ( valid & ATTR_GID ) {
    190                vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid);
    191	}
    192        if ( valid & ATTR_SIZE ) {
    193                vattr->va_size = iattr->ia_size;
    194	}
    195        if ( valid & ATTR_ATIME ) {
    196		vattr->va_atime = timespec64_to_coda(iattr->ia_atime);
    197	}
    198        if ( valid & ATTR_MTIME ) {
    199		vattr->va_mtime = timespec64_to_coda(iattr->ia_mtime);
    200	}
    201        if ( valid & ATTR_CTIME ) {
    202		vattr->va_ctime = timespec64_to_coda(iattr->ia_ctime);
    203	}
    204}
    205