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