The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_stats.c

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    1 /*-
    2  * Copyright (c) 1994-1995 Søren Schmidt
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include "opt_compat.h"
   33 #include "opt_mac.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/dirent.h>
   37 #include <sys/file.h>
   38 #include <sys/filedesc.h>
   39 #include <sys/proc.h>
   40 #include <sys/jail.h>
   41 #include <sys/malloc.h>
   42 #include <sys/mount.h>
   43 #include <sys/namei.h>
   44 #include <sys/stat.h>
   45 #include <sys/syscallsubr.h>
   46 #include <sys/systm.h>
   47 #include <sys/vnode.h>
   48 #include <sys/conf.h>
   49 #include <sys/fcntl.h>
   50 
   51 #ifdef COMPAT_LINUX32
   52 #include <machine/../linux32/linux.h>
   53 #include <machine/../linux32/linux32_proto.h>
   54 #else
   55 #include <machine/../linux/linux.h>
   56 #include <machine/../linux/linux_proto.h>
   57 #endif
   58 
   59 #include <compat/linux/linux_util.h>
   60 
   61 #include <security/mac/mac_framework.h>
   62 
   63 /*
   64  * XXX: This was removed from newstat_copyout(), and almost identical
   65  * XXX: code was in stat64_copyout().  findcdev() needs to be replaced
   66  * XXX: with something that does lookup and locking properly.
   67  * XXX: When somebody fixes this: please try to avoid duplicating it.
   68  */
   69 #if 0
   70 static void
   71 disk_foo(struct somestat *tbuf)
   72 {
   73         struct cdevsw *cdevsw;
   74         struct cdev *dev;
   75 
   76         /* Lie about disk drives which are character devices
   77          * in FreeBSD but block devices under Linux.
   78          */
   79         if (S_ISCHR(tbuf.st_mode) &&
   80             (dev = findcdev(buf->st_rdev)) != NULL) {
   81                 cdevsw = dev_refthread(dev);
   82                 if (cdevsw != NULL) {
   83                         if (cdevsw->d_flags & D_DISK) {
   84                                 tbuf.st_mode &= ~S_IFMT;
   85                                 tbuf.st_mode |= S_IFBLK;
   86 
   87                                 /* XXX this may not be quite right */
   88                                 /* Map major number to 0 */
   89                                 tbuf.st_dev = uminor(buf->st_dev) & 0xf;
   90                                 tbuf.st_rdev = buf->st_rdev & 0xff;
   91                         }
   92                         dev_relthread(dev);
   93                 }
   94         }
   95 
   96 }
   97 #endif
   98 
   99 static void
  100 translate_fd_major_minor(struct thread *td, int fd, struct stat *buf)
  101 {
  102         struct file *fp;
  103         int major, minor;
  104 
  105         if ((!S_ISCHR(buf->st_mode) && !S_ISBLK(buf->st_mode)) ||
  106             fget(td, fd, &fp) != 0)
  107                 return;
  108         if (fp->f_vnode != NULL &&
  109             fp->f_vnode->v_un.vu_cdev != NULL &&
  110             linux_driver_get_major_minor(fp->f_vnode->v_un.vu_cdev->si_name,
  111                                          &major, &minor) == 0)
  112                 buf->st_rdev = (major << 8 | minor);
  113         fdrop(fp, td);
  114 }
  115 
  116 static void
  117 translate_path_major_minor(struct thread *td, char *path, struct stat *buf)
  118 {
  119         struct proc *p = td->td_proc;   
  120         struct filedesc *fdp = p->p_fd;
  121         int fd;
  122         int temp;
  123 
  124         if (!S_ISCHR(buf->st_mode) && !S_ISBLK(buf->st_mode))
  125                 return;
  126         temp = td->td_retval[0];
  127         if (kern_open(td, path, UIO_SYSSPACE, O_RDONLY, 0) != 0)
  128                 return;
  129         fd = td->td_retval[0];
  130         td->td_retval[0] = temp;
  131         translate_fd_major_minor(td, fd, buf);
  132         fdclose(fdp, fdp->fd_ofiles[fd], fd, td);
  133 }
  134 
  135 static int
  136 newstat_copyout(struct stat *buf, void *ubuf)
  137 {
  138         struct l_newstat tbuf;
  139 
  140         bzero(&tbuf, sizeof(tbuf));
  141         tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
  142         tbuf.st_ino = buf->st_ino;
  143         tbuf.st_mode = buf->st_mode;
  144         tbuf.st_nlink = buf->st_nlink;
  145         tbuf.st_uid = buf->st_uid;
  146         tbuf.st_gid = buf->st_gid;
  147         tbuf.st_rdev = buf->st_rdev;
  148         tbuf.st_size = buf->st_size;
  149         tbuf.st_atime = buf->st_atime;
  150         tbuf.st_mtime = buf->st_mtime;
  151         tbuf.st_ctime = buf->st_ctime;
  152         tbuf.st_blksize = buf->st_blksize;
  153         tbuf.st_blocks = buf->st_blocks;
  154 
  155         return (copyout(&tbuf, ubuf, sizeof(tbuf)));
  156 }
  157 
  158 int
  159 linux_newstat(struct thread *td, struct linux_newstat_args *args)
  160 {
  161         struct stat buf;
  162         char *path;
  163         int error;
  164 
  165         LCONVPATHEXIST(td, args->path, &path);
  166 
  167 #ifdef DEBUG
  168         if (ldebug(newstat))
  169                 printf(ARGS(newstat, "%s, *"), path);
  170 #endif
  171 
  172         error = kern_stat(td, path, UIO_SYSSPACE, &buf);
  173         if (!error) {
  174                 if (strlen(path) > strlen("/dev/pts/") &&
  175                     !strncmp(path, "/dev/pts/", strlen("/dev/pts/")) &&
  176                     path[9] >= '' && path[9] <= '9') {
  177                         /*
  178                          * Linux checks major and minors of the slave device
  179                          * to make sure it's a pty device, so let's make him
  180                          * believe it is.
  181                          */
  182                         buf.st_rdev = (136 << 8);
  183                 } else
  184                         translate_path_major_minor(td, path, &buf);
  185         }
  186         LFREEPATH(path);
  187         if (error)
  188                 return (error);
  189         return (newstat_copyout(&buf, args->buf));
  190 }
  191 
  192 int
  193 linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
  194 {
  195         struct stat sb;
  196         char *path;
  197         int error;
  198 
  199         LCONVPATHEXIST(td, args->path, &path);
  200 
  201 #ifdef DEBUG
  202         if (ldebug(newlstat))
  203                 printf(ARGS(newlstat, "%s, *"), path);
  204 #endif
  205 
  206         error = kern_lstat(td, path, UIO_SYSSPACE, &sb);
  207         if (!error)
  208                 translate_path_major_minor(td, path, &sb);
  209         LFREEPATH(path);
  210         if (error)
  211                 return (error);
  212         return (newstat_copyout(&sb, args->buf));
  213 }
  214 
  215 int
  216 linux_newfstat(struct thread *td, struct linux_newfstat_args *args)
  217 {
  218         struct stat buf;
  219         int error;
  220 
  221 #ifdef DEBUG
  222         if (ldebug(newfstat))
  223                 printf(ARGS(newfstat, "%d, *"), args->fd);
  224 #endif
  225 
  226         error = kern_fstat(td, args->fd, &buf);
  227         translate_fd_major_minor(td, args->fd, &buf);
  228         if (!error)
  229                 error = newstat_copyout(&buf, args->buf);
  230 
  231         return (error);
  232 }
  233 
  234 static int
  235 stat_copyout(struct stat *buf, void *ubuf)
  236 {
  237         struct l_stat lbuf;
  238         
  239         bzero(&lbuf, sizeof(lbuf));
  240         lbuf.st_dev = buf->st_dev;
  241         lbuf.st_ino = buf->st_ino;
  242         lbuf.st_mode = buf->st_mode;
  243         lbuf.st_nlink = buf->st_nlink;
  244         lbuf.st_uid = buf->st_uid;
  245         lbuf.st_gid = buf->st_gid;
  246         lbuf.st_rdev = buf->st_rdev;
  247         if (buf->st_size < (quad_t)1 << 32)
  248                 lbuf.st_size = buf->st_size;
  249         else
  250                 lbuf.st_size = -2;
  251         lbuf.st_atime = buf->st_atime;
  252         lbuf.st_mtime = buf->st_mtime;
  253         lbuf.st_ctime = buf->st_ctime;
  254         lbuf.st_blksize = buf->st_blksize;
  255         lbuf.st_blocks = buf->st_blocks;
  256         lbuf.st_flags = buf->st_flags;
  257         lbuf.st_gen = buf->st_gen;
  258 
  259         return (copyout(&lbuf, ubuf, sizeof(lbuf)));
  260 }
  261 
  262 int
  263 linux_stat(struct thread *td, struct linux_stat_args *args)
  264 {
  265         struct stat buf;
  266         char *path;
  267         int error;
  268 
  269         LCONVPATHEXIST(td, args->path, &path);
  270 
  271 #ifdef DEBUG
  272         if (ldebug(stat))
  273                 printf(ARGS(stat, "%s, *"), path);
  274 #endif
  275         error = kern_stat(td, path, UIO_SYSSPACE, &buf);
  276         if (error) {
  277                 LFREEPATH(path);
  278                 return (error);
  279         }
  280         translate_path_major_minor(td, path, &buf);
  281         LFREEPATH(path);
  282         return(stat_copyout(&buf, args->up));
  283 }
  284 
  285 int
  286 linux_lstat(struct thread *td, struct linux_lstat_args *args)
  287 {
  288         struct stat buf;
  289         char *path;
  290         int error;
  291 
  292         LCONVPATHEXIST(td, args->path, &path);
  293 
  294 #ifdef DEBUG
  295         if (ldebug(lstat))
  296                 printf(ARGS(lstat, "%s, *"), path);
  297 #endif
  298         error = kern_lstat(td, path, UIO_SYSSPACE, &buf);
  299         if (error) {
  300                 LFREEPATH(path);
  301                 return (error);
  302         }
  303         translate_path_major_minor(td, path, &buf);
  304         LFREEPATH(path);
  305         return(stat_copyout(&buf, args->up));
  306 }
  307 
  308 /* XXX - All fields of type l_int are defined as l_long on i386 */
  309 struct l_statfs {
  310         l_int           f_type;
  311         l_int           f_bsize;
  312         l_int           f_blocks;
  313         l_int           f_bfree;
  314         l_int           f_bavail;
  315         l_int           f_files;
  316         l_int           f_ffree;
  317         l_fsid_t        f_fsid;
  318         l_int           f_namelen;
  319         l_int           f_spare[6];
  320 };
  321 
  322 #define LINUX_CODA_SUPER_MAGIC  0x73757245L
  323 #define LINUX_EXT2_SUPER_MAGIC  0xEF53L
  324 #define LINUX_HPFS_SUPER_MAGIC  0xf995e849L
  325 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L
  326 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L
  327 #define LINUX_NCP_SUPER_MAGIC   0x564cL
  328 #define LINUX_NFS_SUPER_MAGIC   0x6969L
  329 #define LINUX_NTFS_SUPER_MAGIC  0x5346544EL
  330 #define LINUX_PROC_SUPER_MAGIC  0x9fa0L
  331 #define LINUX_UFS_SUPER_MAGIC   0x00011954L     /* XXX - UFS_MAGIC in Linux */
  332 #define LINUX_DEVFS_SUPER_MAGIC 0x1373L
  333 
  334 static long
  335 bsd_to_linux_ftype(const char *fstypename)
  336 {
  337         int i;
  338         static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = {
  339                 {"ufs",     LINUX_UFS_SUPER_MAGIC},
  340                 {"cd9660",  LINUX_ISOFS_SUPER_MAGIC},
  341                 {"nfs",     LINUX_NFS_SUPER_MAGIC},
  342                 {"ext2fs",  LINUX_EXT2_SUPER_MAGIC},
  343                 {"procfs",  LINUX_PROC_SUPER_MAGIC},
  344                 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC},
  345                 {"ntfs",    LINUX_NTFS_SUPER_MAGIC},
  346                 {"nwfs",    LINUX_NCP_SUPER_MAGIC},
  347                 {"hpfs",    LINUX_HPFS_SUPER_MAGIC},
  348                 {"coda",    LINUX_CODA_SUPER_MAGIC},
  349                 {"devfs",   LINUX_DEVFS_SUPER_MAGIC},
  350                 {NULL,      0L}};
  351 
  352         for (i = 0; b2l_tbl[i].bsd_name != NULL; i++)
  353                 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0)
  354                         return (b2l_tbl[i].linux_type);
  355 
  356         return (0L);
  357 }
  358 
  359 static void
  360 bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs)
  361 {
  362 
  363         linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
  364         linux_statfs->f_bsize = bsd_statfs->f_bsize;
  365         linux_statfs->f_blocks = bsd_statfs->f_blocks;
  366         linux_statfs->f_bfree = bsd_statfs->f_bfree;
  367         linux_statfs->f_bavail = bsd_statfs->f_bavail;
  368         linux_statfs->f_ffree = bsd_statfs->f_ffree;
  369         linux_statfs->f_files = bsd_statfs->f_files;
  370         linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
  371         linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
  372         linux_statfs->f_namelen = MAXNAMLEN;
  373 }
  374 
  375 int
  376 linux_statfs(struct thread *td, struct linux_statfs_args *args)
  377 {
  378         struct l_statfs linux_statfs;
  379         struct statfs bsd_statfs;
  380         char *path;
  381         int error;
  382 
  383         LCONVPATHEXIST(td, args->path, &path);
  384 
  385 #ifdef DEBUG
  386         if (ldebug(statfs))
  387                 printf(ARGS(statfs, "%s, *"), path);
  388 #endif
  389         error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
  390         LFREEPATH(path);
  391         if (error)
  392                 return (error);
  393         bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
  394         return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
  395 }
  396 
  397 static void
  398 bsd_to_linux_statfs64(struct statfs *bsd_statfs, struct l_statfs64 *linux_statfs)
  399 {
  400 
  401         linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
  402         linux_statfs->f_bsize = bsd_statfs->f_bsize;
  403         linux_statfs->f_blocks = bsd_statfs->f_blocks;
  404         linux_statfs->f_bfree = bsd_statfs->f_bfree;
  405         linux_statfs->f_bavail = bsd_statfs->f_bavail;
  406         linux_statfs->f_ffree = bsd_statfs->f_ffree;
  407         linux_statfs->f_files = bsd_statfs->f_files;
  408         linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
  409         linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
  410         linux_statfs->f_namelen = MAXNAMLEN;
  411 }
  412 
  413 int
  414 linux_statfs64(struct thread *td, struct linux_statfs64_args *args)
  415 {
  416         struct l_statfs64 linux_statfs;
  417         struct statfs bsd_statfs;
  418         char *path;
  419         int error;
  420 
  421         if (args->bufsize != sizeof(struct l_statfs64))
  422                 return EINVAL;
  423 
  424         LCONVPATHEXIST(td, args->path, &path);
  425 
  426 #ifdef DEBUG
  427         if (ldebug(statfs64))
  428                 printf(ARGS(statfs64, "%s, *"), path);
  429 #endif
  430         error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
  431         LFREEPATH(path);
  432         if (error)
  433                 return (error);
  434         bsd_to_linux_statfs64(&bsd_statfs, &linux_statfs);
  435         return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
  436 }
  437 
  438 int
  439 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args)
  440 {
  441         struct l_statfs linux_statfs;
  442         struct statfs bsd_statfs;
  443         int error;
  444 
  445 #ifdef DEBUG
  446         if (ldebug(fstatfs))
  447                 printf(ARGS(fstatfs, "%d, *"), args->fd);
  448 #endif
  449         error = kern_fstatfs(td, args->fd, &bsd_statfs);
  450         if (error)
  451                 return error;
  452         bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
  453         return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
  454 }
  455 
  456 struct l_ustat
  457 {
  458         l_daddr_t       f_tfree;
  459         l_ino_t         f_tinode;
  460         char            f_fname[6];
  461         char            f_fpack[6];
  462 };
  463 
  464 int
  465 linux_ustat(struct thread *td, struct linux_ustat_args *args)
  466 {
  467 #ifdef DEBUG
  468         if (ldebug(ustat))
  469                 printf(ARGS(ustat, "%d, *"), args->dev);
  470 #endif
  471 
  472         return (EOPNOTSUPP);
  473 }
  474 
  475 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  476 
  477 static int
  478 stat64_copyout(struct stat *buf, void *ubuf)
  479 {
  480         struct l_stat64 lbuf;
  481 
  482         bzero(&lbuf, sizeof(lbuf));
  483         lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
  484         lbuf.st_ino = buf->st_ino;
  485         lbuf.st_mode = buf->st_mode;
  486         lbuf.st_nlink = buf->st_nlink;
  487         lbuf.st_uid = buf->st_uid;
  488         lbuf.st_gid = buf->st_gid;
  489         lbuf.st_rdev = buf->st_rdev;
  490         lbuf.st_size = buf->st_size;
  491         lbuf.st_atime = buf->st_atime;
  492         lbuf.st_mtime = buf->st_mtime;
  493         lbuf.st_ctime = buf->st_ctime;
  494         lbuf.st_blksize = buf->st_blksize;
  495         lbuf.st_blocks = buf->st_blocks;
  496 
  497         /*
  498          * The __st_ino field makes all the difference. In the Linux kernel
  499          * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO,
  500          * but without the assignment to __st_ino the runtime linker refuses
  501          * to mmap(2) any shared libraries. I guess it's broken alright :-)
  502          */
  503         lbuf.__st_ino = buf->st_ino;
  504 
  505         return (copyout(&lbuf, ubuf, sizeof(lbuf)));
  506 }
  507 
  508 int
  509 linux_stat64(struct thread *td, struct linux_stat64_args *args)
  510 {
  511         struct stat buf;
  512         char *filename;
  513         int error;
  514 
  515         LCONVPATHEXIST(td, args->filename, &filename);
  516 
  517 #ifdef DEBUG
  518         if (ldebug(stat64))
  519                 printf(ARGS(stat64, "%s, *"), filename);
  520 #endif
  521 
  522         error = kern_stat(td, filename, UIO_SYSSPACE, &buf);
  523         if (!error) {
  524                 if (strlen(filename) > strlen("/dev/pts/") &&
  525                     !strncmp(filename, "/dev/pts/", strlen("/dev/pts/")) &&
  526                     filename[9] >= '' && filename[9] <= '9') {
  527                         /*
  528                          * Linux checks major and minors of the slave device
  529                          * to make sure it's a pty deivce, so let's make him
  530                          * believe it is.
  531                          */
  532                         buf.st_rdev = (136 << 8);
  533                 } else
  534                         translate_path_major_minor(td, filename, &buf);
  535         }
  536         LFREEPATH(filename);
  537         if (error)
  538                 return (error);
  539         return (stat64_copyout(&buf, args->statbuf));
  540 }
  541 
  542 int
  543 linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
  544 {
  545         struct stat sb;
  546         char *filename;
  547         int error;
  548 
  549         LCONVPATHEXIST(td, args->filename, &filename);
  550 
  551 #ifdef DEBUG
  552         if (ldebug(lstat64))
  553                 printf(ARGS(lstat64, "%s, *"), args->filename);
  554 #endif
  555 
  556         error = kern_lstat(td, filename, UIO_SYSSPACE, &sb);
  557         if (!error)
  558                 translate_path_major_minor(td, filename, &sb);
  559         LFREEPATH(filename);
  560         if (error)
  561                 return (error);
  562         return (stat64_copyout(&sb, args->statbuf));
  563 }
  564 
  565 int
  566 linux_fstat64(struct thread *td, struct linux_fstat64_args *args)
  567 {
  568         struct stat buf;
  569         int error;
  570 
  571 #ifdef DEBUG
  572         if (ldebug(fstat64))
  573                 printf(ARGS(fstat64, "%d, *"), args->fd);
  574 #endif
  575 
  576         error = kern_fstat(td, args->fd, &buf);
  577         translate_fd_major_minor(td, args->fd, &buf);
  578         if (!error)
  579                 error = stat64_copyout(&buf, args->statbuf);
  580 
  581         return (error);
  582 }
  583 
  584 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */

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