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Linux/fs/coda/coda_linux.c

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  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 = timespec_to_timespec64(attr->va_atime);
109         if (attr->va_mtime.tv_sec != -1)
110                 inode->i_mtime = timespec_to_timespec64(attr->va_mtime);
111         if (attr->va_ctime.tv_sec != -1)
112                 inode->i_ctime = timespec_to_timespec64(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 = timespec64_to_timespec(iattr->ia_atime);
179         }
180         if ( valid & ATTR_MTIME ) {
181                 vattr->va_mtime = timespec64_to_timespec(iattr->ia_mtime);
182         }
183         if ( valid & ATTR_CTIME ) {
184                 vattr->va_ctime = timespec64_to_timespec(iattr->ia_ctime);
185         }
186 }
187 
188 

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