2.11BSD#431 - /usr/src/sys/sys/ufs_syscalls2.c

   1: /*
   2:  * 	@(#) 	ufs_syscalls2.c	  1.5 (2.11BSD) 1997/1/31
   3:  *
   4:  * ufs_syscalls was getting too large.  Various UFS related system calls were
   5:  * relocated to this file.
   6: */
   7: 
   8: #include "param.h"
   9: #include "../machine/seg.h"
  10: #include "sys/file.h"
  11: #include "user.h"
  12: #include "inode.h"
  13: #include "buf.h"
  14: #include "fs.h"
  15: #include "namei.h"
  16: #include "mount.h"
  17: #include "kernel.h"
  18: 
  19: statfs()
  20:     {
  21:     register struct a
  22:         {
  23:         char    *path;
  24:         struct  statfs  *buf;
  25:         } *uap = (struct a *)u.u_ap;
  26:     register struct inode   *ip;
  27:     struct  nameidata nd;
  28:     register struct nameidata *ndp = &nd;
  29:     struct  mount   *mp;
  30: 
  31:     NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path);
  32:     ip = namei(ndp);
  33:     if  (!ip)
  34:         return(u.u_error);
  35:     mp = (struct mount *)((int)ip->i_fs - offsetof(struct mount, m_filsys));
  36:     iput(ip);
  37:     u.u_error = statfs1(mp, uap->buf);
  38:     return(u.u_error);
  39:     }
  40: 
  41: fstatfs()
  42:     {
  43:     register struct a
  44:         {
  45:         int fd;
  46:         struct  statfs *buf;
  47:         } *uap = (struct a *)u.u_ap;
  48:     register struct inode *ip;
  49:     struct  mount *mp;
  50: 
  51:     ip = getinode(uap->fd);
  52:     if  (!ip)
  53:         return(u.u_error);
  54:     mp = (struct mount *)((int)ip->i_fs - offsetof(struct mount, m_filsys));
  55:     u.u_error = statfs1(mp, uap->buf);
  56:     return(u.u_error);
  57:     }
  58: 
  59: statfs1(mp, sbp)
  60:     struct  mount   *mp;
  61:     struct  statfs  *sbp;
  62:     {
  63:     struct  statfs  sfs;
  64:     register struct statfs  *sfsp;
  65:     struct  xmount  *xmp = (struct xmount *)SEG5;
  66:     struct  fs  *fs = &mp->m_filsys;
  67: 
  68:     sfsp = &sfs;
  69:     sfsp->f_type = MOUNT_UFS;
  70:     sfsp->f_bsize = MAXBSIZE;
  71:     sfsp->f_iosize = MAXBSIZE;
  72:     sfsp->f_blocks = fs->fs_fsize - fs->fs_isize;
  73:     sfsp->f_bfree = fs->fs_tfree;
  74:     sfsp->f_bavail = fs->fs_tfree;
  75:     sfsp->f_files = (fs->fs_isize - 2) * INOPB;
  76:     sfsp->f_ffree = fs->fs_tinode;
  77: 
  78:     mapseg5(mp->m_extern, XMOUNTDESC);
  79:     bcopy(xmp->xm_mnton, sfsp->f_mntonname, MNAMELEN);
  80:     bcopy(xmp->xm_mntfrom, sfsp->f_mntfromname, MNAMELEN);
  81:     normalseg5();
  82:     sfsp->f_flags = mp->m_flags & MNT_VISFLAGMASK;
  83:     return(copyout(sfsp, sbp, sizeof (struct statfs)));
  84:     }
  85: 
  86: getfsstat()
  87:     {
  88:     register struct a
  89:         {
  90:         struct  statfs  *buf;
  91:         int bufsize;
  92:         u_int   flags;
  93:         } *uap = (struct a *)u.u_ap;
  94:     register struct mount *mp;
  95:     caddr_t sfsp;
  96:     int count, maxcount, error;
  97: 
  98:     maxcount = uap->bufsize / sizeof (struct statfs);
  99:     sfsp = (caddr_t)uap->buf;
 100:     count = 0;
 101:     for (mp = mount; mp < &mount[NMOUNT]; mp++)
 102:         {
 103:         if  (mp->m_inodp == NULL)
 104:             continue;
 105:         if  (count < maxcount)
 106:             {
 107:             if  (error = statfs1(mp, sfsp))
 108:                 return(u.u_error = error);
 109:             sfsp += sizeof (struct statfs);
 110:             }
 111:         count++;
 112:         }
 113:     if  (sfsp && count > maxcount)
 114:         u.u_r.r_val1 = maxcount;
 115:     else
 116:         u.u_r.r_val1 = count;
 117:     return(0);
 118:     }
 119: 
 120: /*
 121:  * 'ufs_sync' is the routine which syncs a single filesystem.  This was
 122:  * created to replace 'update' which 'unmount' called.  It seemed silly to
 123:  * sync _every_ filesystem when unmounting just one filesystem.
 124: */
 125: 
 126: ufs_sync(mp)
 127:     register struct mount *mp;
 128:     {
 129:     register struct fs *fs;
 130:     struct  buf *bp;
 131:     int error = 0;
 132: 
 133:     fs = &mp->m_filsys;
 134:     if  (fs->fs_fmod && (mp->m_flags & MNT_RDONLY))
 135:         {
 136:         printf("fs = %s\n", fs->fs_fsmnt);
 137:         panic("sync: rofs");
 138:         }
 139:     syncinodes(fs);     /* sync the inodes for this filesystem */
 140:     bflush(mp->m_dev);  /* flush dirty data blocks */
 141: #ifdef  QUOTA
 142:     qsync(mp->m_dev);   /* sync the quotas */
 143: #endif
 144: 
 145: /*
 146:  * And lastly the superblock, if the filesystem was modified.
 147:  * Write back modified superblocks. Consistency check that the superblock
 148:  * of each file system is still in the buffer cache.
 149: */
 150:     if  (fs->fs_fmod)
 151:         {
 152:         bp =  getblk(mp->m_dev, SUPERB);
 153:         fs->fs_fmod = 0;
 154:         fs->fs_time = time.tv_sec;
 155:         bcopy(fs, mapin(bp), sizeof (struct fs));
 156:         mapout(bp);
 157:         bwrite(bp);
 158:         error = geterror(bp);
 159:         }
 160:     return(error);
 161:     }
 162: 
 163: /*
 164:  * This is somewhat inefficient in that the inode table is scanned for each
 165:  * filesystem but it didn't seem worth a page or two of code on something
 166:  * which only happens every 30 seconds.
 167: */
 168: 
 169: syncinodes(fs)
 170:     struct  fs *fs;
 171:     {
 172:     register struct inode *ip;
 173: 
 174:     /*
 175: 	 * Write back each (modified) inode.
 176: 	 */
 177:     for (ip = inode; ip < inodeNINODE; ip++)
 178:         {
 179: /*
 180:  * Attempt to reduce the overhead by short circuiting the scan if the
 181:  * inode is not for the filesystem being processed.
 182: */
 183:         if  (ip->i_fs != fs)
 184:             continue;
 185:         if ((ip->i_flag & ILOCKED) != 0 || ip->i_count == 0 ||
 186:                (ip->i_flag & (IMOD|IACC|IUPD|ICHG)) == 0)
 187:             continue;
 188:         ip->i_flag |= ILOCKED;
 189:         ip->i_count++;
 190:         iupdat(ip, &time, &time, 0);
 191:         iput(ip);
 192:         }
 193:     }
 194: 
 195: /*
 196:  * mode mask for creation of files
 197:  */
 198: umask()
 199: {
 200:     register struct a {
 201:         int mask;
 202:     } *uap = (struct a *)u.u_ap;
 203: 
 204:     u.u_r.r_val1 = u.u_cmask;
 205:     u.u_cmask = uap->mask & 07777;
 206: }
 207: 
 208: /*
 209:  * Seek system call
 210:  */
 211: lseek()
 212: {
 213:     register struct file *fp;
 214:     register struct a {
 215:         int fd;
 216:         off_t   off;
 217:         int sbase;
 218:     } *uap = (struct a *)u.u_ap;
 219: 
 220:     if ((fp = getf(uap->fd)) == NULL)
 221:         return;
 222:     if (fp->f_type != DTYPE_INODE) {
 223:         u.u_error = ESPIPE;
 224:         return;
 225:     }
 226:     switch (uap->sbase) {
 227: 
 228:     case L_INCR:
 229:         fp->f_offset += uap->off;
 230:         break;
 231:     case L_XTND:
 232:         fp->f_offset = uap->off + ((struct inode *)fp->f_data)->i_size;
 233:         break;
 234:     case L_SET:
 235:         fp->f_offset = uap->off;
 236:         break;
 237:     default:
 238:         u.u_error = EINVAL;
 239:         return;
 240:     }
 241:     u.u_r.r_off = fp->f_offset;
 242: }
 243: 
 244: /*
 245:  * Synch an open file.
 246:  */
 247: fsync()
 248: {
 249:     register struct a {
 250:         int fd;
 251:     } *uap = (struct a *)u.u_ap;
 252:     register struct inode *ip;
 253: 
 254:     if ((ip = getinode(uap->fd)) == NULL)
 255:         return;
 256:     ilock(ip);
 257:     syncip(ip);
 258:     iunlock(ip);
 259: }
 260: 
 261: utimes()
 262: {
 263:     register struct a {
 264:         char    *fname;
 265:         struct  timeval *tptr;
 266:     } *uap = (struct a *)u.u_ap;
 267:     register struct inode *ip;
 268:     struct  nameidata nd;
 269:     register struct nameidata *ndp = &nd;
 270:     struct timeval tv[2];
 271:     struct vattr vattr;
 272: 
 273:     VATTR_NULL(&vattr);
 274:     if (uap->tptr == NULL) {
 275:         tv[0].tv_sec = tv[1].tv_sec = time.tv_sec;
 276:         vattr.va_vaflags |= VA_UTIMES_NULL;
 277:     } else if (u.u_error = copyin((caddr_t)uap->tptr,(caddr_t)tv,sizeof(tv)))
 278:         return;
 279:     NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, uap->fname);
 280:     if ((ip = namei(ndp)) == NULL)
 281:         return;
 282:     vattr.va_atime = tv[0].tv_sec;
 283:     vattr.va_mtime = tv[1].tv_sec;
 284:     u.u_error = ufs_setattr(ip, &vattr);
 285:     iput(ip);
 286: }

Defined functions

Defined struct's