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 */ 25 int coda_fake_statfs; 26 27 /* print a fid */ 28 char * 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 */ 38 int coda_iscontrol(const char *name, size_t length) 39 { 40 return ((CODA_CONTROLLEN == length) && 41 (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0)); 42 } 43 44 unsigned 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 69 static 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 79 static 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 */ 90 umode_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 } 104 105 void 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_set_ctime_to_ts(inode, 131 coda_to_timespec64(attr->va_ctime)); 132 } 133 134 135 /* 136 * BSD sets attributes that need not be modified to -1. 137 * Linux uses the valid field to indicate what should be 138 * looked at. The BSD type field needs to be deduced from linux 139 * mode. 140 * So we have to do some translations here. 141 */ 142 143 void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr) 144 { 145 unsigned int valid; 146 147 /* clean out */ 148 vattr->va_mode = -1; 149 vattr->va_uid = (vuid_t) -1; 150 vattr->va_gid = (vgid_t) -1; 151 vattr->va_size = (off_t) -1; 152 vattr->va_atime.tv_sec = (int64_t) -1; 153 vattr->va_atime.tv_nsec = (long) -1; 154 vattr->va_mtime.tv_sec = (int64_t) -1; 155 vattr->va_mtime.tv_nsec = (long) -1; 156 vattr->va_ctime.tv_sec = (int64_t) -1; 157 vattr->va_ctime.tv_nsec = (long) -1; 158 vattr->va_type = C_VNON; 159 vattr->va_fileid = -1; 160 vattr->va_gen = -1; 161 vattr->va_bytes = -1; 162 vattr->va_nlink = -1; 163 vattr->va_blocksize = -1; 164 vattr->va_rdev = -1; 165 vattr->va_flags = 0; 166 167 /* determine the type */ 168 #if 0 169 mode = iattr->ia_mode; 170 if ( S_ISDIR(mode) ) { 171 vattr->va_type = C_VDIR; 172 } else if ( S_ISREG(mode) ) { 173 vattr->va_type = C_VREG; 174 } else if ( S_ISLNK(mode) ) { 175 vattr->va_type = C_VLNK; 176 } else { 177 /* don't do others */ 178 vattr->va_type = C_VNON; 179 } 180 #endif 181 182 /* set those vattrs that need change */ 183 valid = iattr->ia_valid; 184 if ( valid & ATTR_MODE ) { 185 vattr->va_mode = iattr->ia_mode; 186 } 187 if ( valid & ATTR_UID ) { 188 vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid); 189 } 190 if ( valid & ATTR_GID ) { 191 vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid); 192 } 193 if ( valid & ATTR_SIZE ) { 194 vattr->va_size = iattr->ia_size; 195 } 196 if ( valid & ATTR_ATIME ) { 197 vattr->va_atime = timespec64_to_coda(iattr->ia_atime); 198 } 199 if ( valid & ATTR_MTIME ) { 200 vattr->va_mtime = timespec64_to_coda(iattr->ia_mtime); 201 } 202 if ( valid & ATTR_CTIME ) { 203 vattr->va_ctime = timespec64_to_coda(iattr->ia_ctime); 204 } 205 } 206 207