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_linux.h> 21 #include <linux/coda_psdev.h> 22 #include <linux/coda_fs_i.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 /* recognize /coda inode */ 45 int coda_isroot(struct inode *i) 46 { 47 return ( i->i_sb->s_root->d_inode == i ); 48 } 49 50 unsigned short coda_flags_to_cflags(unsigned short flags) 51 { 52 unsigned short coda_flags = 0; 53 54 if ((flags & O_ACCMODE) == O_RDONLY) 55 coda_flags |= C_O_READ; 56 57 if ((flags & O_ACCMODE) == O_RDWR) 58 coda_flags |= C_O_READ | C_O_WRITE; 59 60 if ((flags & O_ACCMODE) == O_WRONLY) 61 coda_flags |= C_O_WRITE; 62 63 if (flags & O_TRUNC) 64 coda_flags |= C_O_TRUNC; 65 66 if (flags & O_CREAT) 67 coda_flags |= C_O_CREAT; 68 69 if (flags & O_EXCL) 70 coda_flags |= C_O_EXCL; 71 72 return coda_flags; 73 } 74 75 76 /* utility functions below */ 77 void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr) 78 { 79 int inode_type; 80 /* inode's i_flags, i_ino are set by iget 81 XXX: is this all we need ?? 82 */ 83 switch (attr->va_type) { 84 case C_VNON: 85 inode_type = 0; 86 break; 87 case C_VREG: 88 inode_type = S_IFREG; 89 break; 90 case C_VDIR: 91 inode_type = S_IFDIR; 92 break; 93 case C_VLNK: 94 inode_type = S_IFLNK; 95 break; 96 default: 97 inode_type = 0; 98 } 99 inode->i_mode |= inode_type; 100 101 if (attr->va_mode != (u_short) -1) 102 inode->i_mode = attr->va_mode | inode_type; 103 if (attr->va_uid != -1) 104 inode->i_uid = (uid_t) attr->va_uid; 105 if (attr->va_gid != -1) 106 inode->i_gid = (gid_t) attr->va_gid; 107 if (attr->va_nlink != -1) 108 inode->i_nlink = attr->va_nlink; 109 if (attr->va_size != -1) 110 inode->i_size = attr->va_size; 111 if (attr->va_size != -1) 112 inode->i_blocks = (attr->va_size + 511) >> 9; 113 if (attr->va_atime.tv_sec != -1) 114 inode->i_atime = attr->va_atime; 115 if (attr->va_mtime.tv_sec != -1) 116 inode->i_mtime = attr->va_mtime; 117 if (attr->va_ctime.tv_sec != -1) 118 inode->i_ctime = attr->va_ctime; 119 } 120 121 122 /* 123 * BSD sets attributes that need not be modified to -1. 124 * Linux uses the valid field to indicate what should be 125 * looked at. The BSD type field needs to be deduced from linux 126 * mode. 127 * So we have to do some translations here. 128 */ 129 130 void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr) 131 { 132 unsigned int valid; 133 134 /* clean out */ 135 vattr->va_mode = -1; 136 vattr->va_uid = (vuid_t) -1; 137 vattr->va_gid = (vgid_t) -1; 138 vattr->va_size = (off_t) -1; 139 vattr->va_atime.tv_sec = (time_t) -1; 140 vattr->va_atime.tv_nsec = (time_t) -1; 141 vattr->va_mtime.tv_sec = (time_t) -1; 142 vattr->va_mtime.tv_nsec = (time_t) -1; 143 vattr->va_ctime.tv_sec = (time_t) -1; 144 vattr->va_ctime.tv_nsec = (time_t) -1; 145 vattr->va_type = C_VNON; 146 vattr->va_fileid = -1; 147 vattr->va_gen = -1; 148 vattr->va_bytes = -1; 149 vattr->va_nlink = -1; 150 vattr->va_blocksize = -1; 151 vattr->va_rdev = -1; 152 vattr->va_flags = 0; 153 154 /* determine the type */ 155 #if 0 156 mode = iattr->ia_mode; 157 if ( S_ISDIR(mode) ) { 158 vattr->va_type = C_VDIR; 159 } else if ( S_ISREG(mode) ) { 160 vattr->va_type = C_VREG; 161 } else if ( S_ISLNK(mode) ) { 162 vattr->va_type = C_VLNK; 163 } else { 164 /* don't do others */ 165 vattr->va_type = C_VNON; 166 } 167 #endif 168 169 /* set those vattrs that need change */ 170 valid = iattr->ia_valid; 171 if ( valid & ATTR_MODE ) { 172 vattr->va_mode = iattr->ia_mode; 173 } 174 if ( valid & ATTR_UID ) { 175 vattr->va_uid = (vuid_t) iattr->ia_uid; 176 } 177 if ( valid & ATTR_GID ) { 178 vattr->va_gid = (vgid_t) iattr->ia_gid; 179 } 180 if ( valid & ATTR_SIZE ) { 181 vattr->va_size = iattr->ia_size; 182 } 183 if ( valid & ATTR_ATIME ) { 184 vattr->va_atime = iattr->ia_atime; 185 } 186 if ( valid & ATTR_MTIME ) { 187 vattr->va_mtime = iattr->ia_mtime; 188 } 189 if ( valid & ATTR_CTIME ) { 190 vattr->va_ctime = iattr->ia_ctime; 191 } 192 } 193 194