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 <linux/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 70 /* utility functions below */ 71 void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr) 72 { 73 int inode_type; 74 /* inode's i_flags, i_ino are set by iget 75 XXX: is this all we need ?? 76 */ 77 switch (attr->va_type) { 78 case C_VNON: 79 inode_type = 0; 80 break; 81 case C_VREG: 82 inode_type = S_IFREG; 83 break; 84 case C_VDIR: 85 inode_type = S_IFDIR; 86 break; 87 case C_VLNK: 88 inode_type = S_IFLNK; 89 break; 90 default: 91 inode_type = 0; 92 } 93 inode->i_mode |= inode_type; 94 95 if (attr->va_mode != (u_short) -1) 96 inode->i_mode = attr->va_mode | inode_type; 97 if (attr->va_uid != -1) 98 inode->i_uid = make_kuid(&init_user_ns, (uid_t) attr->va_uid); 99 if (attr->va_gid != -1) 100 inode->i_gid = make_kgid(&init_user_ns, (gid_t) attr->va_gid); 101 if (attr->va_nlink != -1) 102 set_nlink(inode, attr->va_nlink); 103 if (attr->va_size != -1) 104 inode->i_size = attr->va_size; 105 if (attr->va_size != -1) 106 inode->i_blocks = (attr->va_size + 511) >> 9; 107 if (attr->va_atime.tv_sec != -1) 108 inode->i_atime = attr->va_atime; 109 if (attr->va_mtime.tv_sec != -1) 110 inode->i_mtime = attr->va_mtime; 111 if (attr->va_ctime.tv_sec != -1) 112 inode->i_ctime = attr->va_ctime; 113 } 114 115 116 /* 117 * BSD sets attributes that need not be modified to -1. 118 * Linux uses the valid field to indicate what should be 119 * looked at. The BSD type field needs to be deduced from linux 120 * mode. 121 * So we have to do some translations here. 122 */ 123 124 void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr) 125 { 126 unsigned int valid; 127 128 /* clean out */ 129 vattr->va_mode = -1; 130 vattr->va_uid = (vuid_t) -1; 131 vattr->va_gid = (vgid_t) -1; 132 vattr->va_size = (off_t) -1; 133 vattr->va_atime.tv_sec = (time_t) -1; 134 vattr->va_atime.tv_nsec = (time_t) -1; 135 vattr->va_mtime.tv_sec = (time_t) -1; 136 vattr->va_mtime.tv_nsec = (time_t) -1; 137 vattr->va_ctime.tv_sec = (time_t) -1; 138 vattr->va_ctime.tv_nsec = (time_t) -1; 139 vattr->va_type = C_VNON; 140 vattr->va_fileid = -1; 141 vattr->va_gen = -1; 142 vattr->va_bytes = -1; 143 vattr->va_nlink = -1; 144 vattr->va_blocksize = -1; 145 vattr->va_rdev = -1; 146 vattr->va_flags = 0; 147 148 /* determine the type */ 149 #if 0 150 mode = iattr->ia_mode; 151 if ( S_ISDIR(mode) ) { 152 vattr->va_type = C_VDIR; 153 } else if ( S_ISREG(mode) ) { 154 vattr->va_type = C_VREG; 155 } else if ( S_ISLNK(mode) ) { 156 vattr->va_type = C_VLNK; 157 } else { 158 /* don't do others */ 159 vattr->va_type = C_VNON; 160 } 161 #endif 162 163 /* set those vattrs that need change */ 164 valid = iattr->ia_valid; 165 if ( valid & ATTR_MODE ) { 166 vattr->va_mode = iattr->ia_mode; 167 } 168 if ( valid & ATTR_UID ) { 169 vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid); 170 } 171 if ( valid & ATTR_GID ) { 172 vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid); 173 } 174 if ( valid & ATTR_SIZE ) { 175 vattr->va_size = iattr->ia_size; 176 } 177 if ( valid & ATTR_ATIME ) { 178 vattr->va_atime = iattr->ia_atime; 179 } 180 if ( valid & ATTR_MTIME ) { 181 vattr->va_mtime = iattr->ia_mtime; 182 } 183 if ( valid & ATTR_CTIME ) { 184 vattr->va_ctime = iattr->ia_ctime; 185 } 186 } 187 188