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: releng/6.3/sys/compat/linux/linux_stats.c 174447 2007-12-08 13:43:48Z dwmalone $");
   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/mac.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mount.h>
   44 #include <sys/namei.h>
   45 #include <sys/stat.h>
   46 #include <sys/syscallsubr.h>
   47 #include <sys/systm.h>
   48 #include <sys/vnode.h>
   49 #include <sys/conf.h>
   50 #include <sys/fcntl.h>
   51 
   52 #ifdef COMPAT_LINUX32
   53 #include <machine/../linux32/linux.h>
   54 #include <machine/../linux32/linux32_proto.h>
   55 #else
   56 #include <machine/../linux/linux.h>
   57 #include <machine/../linux/linux_proto.h>
   58 #endif
   59 
   60 #include <compat/linux/linux_util.h>
   61 
   62 /*
   63  * XXX: This was removed from newstat_copyout(), and almost identical
   64  * XXX: code was in stat64_copyout().  findcdev() needs to be replaced
   65  * XXX: with something that does lookup and locking properly.
   66  * XXX: When somebody fixes this: please try to avoid duplicating it.
   67  */
   68 #if 0
   69 static void
   70 disk_foo(struct somestat *tbuf)
   71 {
   72         struct cdevsw *cdevsw;
   73         struct cdev *dev;
   74 
   75         /* Lie about disk drives which are character devices
   76          * in FreeBSD but block devices under Linux.
   77          */
   78         if (S_ISCHR(tbuf.st_mode) &&
   79             (dev = findcdev(buf->st_rdev)) != NULL) {
   80                 cdevsw = dev_refthread(dev);
   81                 if (cdevsw != NULL) {
   82                         if (cdevsw->d_flags & D_DISK) {
   83                                 tbuf.st_mode &= ~S_IFMT;
   84                                 tbuf.st_mode |= S_IFBLK;
   85 
   86                                 /* XXX this may not be quite right */
   87                                 /* Map major number to 0 */
   88                                 tbuf.st_dev = uminor(buf->st_dev) & 0xf;
   89                                 tbuf.st_rdev = buf->st_rdev & 0xff;
   90                         }
   91                         dev_relthread(dev);
   92                 }
   93         }
   94 
   95 }
   96 #endif
   97 
   98 static void
   99 translate_fd_major_minor(struct thread *td, int fd, struct stat *buf)
  100 {
  101         struct file *fp;
  102         int error;
  103         int major, minor;
  104 
  105         if ((error = fget(td, fd, &fp)) != 0)
  106                 return;
  107         if (fp->f_vnode) {
  108                 if (fp->f_vnode->v_type == VCHR
  109                     || fp->f_vnode->v_type == VBLK) {
  110                         if (fp->f_vnode->v_un.vu_cdev) {
  111                                 if (linux_driver_get_major_minor(
  112                                     fp->f_vnode->v_un.vu_cdev->si_name,
  113                                     &major, &minor) == 0) {
  114                                         buf->st_rdev = (major << 8 | minor);
  115                                 }
  116                         }
  117                 }
  118         }
  119         fdrop(fp, td);
  120 }
  121 
  122 static void
  123 translate_path_major_minor(struct thread *td, char *path, struct stat *buf)
  124 {
  125         struct proc *p = td->td_proc;   
  126         struct filedesc *fdp = p->p_fd;
  127         struct file *fp;
  128         int fd;
  129         int temp;
  130 
  131         temp = td->td_retval[0];
  132         if (kern_open(td, path, UIO_SYSSPACE, O_RDONLY, 0) != 0)
  133                 return;
  134         fd = td->td_retval[0];
  135         td->td_retval[0] = temp;
  136         translate_fd_major_minor(td, fd, buf);
  137         FILEDESC_LOCK(fdp);
  138         fp = fdp->fd_ofiles[fd];
  139         FILEDESC_UNLOCK(fdp);
  140         fdclose(fdp, fdp->fd_ofiles[fd], fd, td);
  141 }
  142 
  143 static int
  144 newstat_copyout(struct stat *buf, void *ubuf)
  145 {
  146         struct l_newstat tbuf;
  147 
  148         bzero(&tbuf, sizeof(tbuf));
  149         tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
  150         tbuf.st_ino = buf->st_ino;
  151         tbuf.st_mode = buf->st_mode;
  152         tbuf.st_nlink = buf->st_nlink;
  153         tbuf.st_uid = buf->st_uid;
  154         tbuf.st_gid = buf->st_gid;
  155         tbuf.st_rdev = buf->st_rdev;
  156         tbuf.st_size = buf->st_size;
  157         tbuf.st_atime = buf->st_atime;
  158         tbuf.st_mtime = buf->st_mtime;
  159         tbuf.st_ctime = buf->st_ctime;
  160         tbuf.st_blksize = buf->st_blksize;
  161         tbuf.st_blocks = buf->st_blocks;
  162 
  163         return (copyout(&tbuf, ubuf, sizeof(tbuf)));
  164 }
  165 
  166 int
  167 linux_newstat(struct thread *td, struct linux_newstat_args *args)
  168 {
  169         struct stat buf;
  170         char *path;
  171         int error;
  172 
  173         LCONVPATHEXIST(td, args->path, &path);
  174 
  175 #ifdef DEBUG
  176         if (ldebug(newstat))
  177                 printf(ARGS(newstat, "%s, *"), path);
  178 #endif
  179 
  180         error = kern_stat(td, path, UIO_SYSSPACE, &buf);
  181           if (!error && strlen(path) > strlen("/dev/pts/") &&
  182               !strncmp(path, "/dev/pts/", strlen("/dev/pts/"))
  183               && path[9] >= '' && path[9] <= '9') {
  184                   /*
  185                    * Linux checks major and minors of the slave device to make
  186                    * sure it's a pty device, so let's make him believe it is.
  187                    */
  188                   buf.st_rdev = (136 << 8);
  189           }
  190 
  191         translate_path_major_minor(td, path, &buf);
  192 
  193         LFREEPATH(path);
  194         if (error)
  195                 return (error);
  196         return (newstat_copyout(&buf, args->buf));
  197 }
  198 
  199 int
  200 linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
  201 {
  202         struct stat sb;
  203         char *path;
  204         int error;
  205 
  206         LCONVPATHEXIST(td, args->path, &path);
  207 
  208 #ifdef DEBUG
  209         if (ldebug(newlstat))
  210                 printf(ARGS(newlstat, "%s, *"), path);
  211 #endif
  212 
  213         error = kern_lstat(td, path, UIO_SYSSPACE, &sb);
  214         if (!error)
  215                 translate_path_major_minor(td, path, &sb);
  216         LFREEPATH(path);
  217         if (error)
  218                 return (error);
  219         return (newstat_copyout(&sb, args->buf));
  220 }
  221 
  222 int
  223 linux_newfstat(struct thread *td, struct linux_newfstat_args *args)
  224 {
  225         struct stat buf;
  226         int error;
  227 
  228 #ifdef DEBUG
  229         if (ldebug(newfstat))
  230                 printf(ARGS(newfstat, "%d, *"), args->fd);
  231 #endif
  232 
  233         error = kern_fstat(td, args->fd, &buf);
  234         translate_fd_major_minor(td, args->fd, &buf);
  235         if (!error)
  236                 error = newstat_copyout(&buf, args->buf);
  237 
  238         return (error);
  239 }
  240 
  241 static int
  242 stat_copyout(struct stat *buf, void *ubuf)
  243 {
  244         struct l_stat lbuf;
  245         
  246         bzero(&lbuf, sizeof(lbuf));
  247         lbuf.st_dev = buf->st_dev;
  248         lbuf.st_ino = buf->st_ino;
  249         lbuf.st_mode = buf->st_mode;
  250         lbuf.st_nlink = buf->st_nlink;
  251         lbuf.st_uid = buf->st_uid;
  252         lbuf.st_gid = buf->st_gid;
  253         lbuf.st_rdev = buf->st_rdev;
  254         if (buf->st_size < (quad_t)1 << 32)
  255                 lbuf.st_size = buf->st_size;
  256         else
  257                 lbuf.st_size = -2;
  258         lbuf.st_atime = buf->st_atime;
  259         lbuf.st_mtime = buf->st_mtime;
  260         lbuf.st_ctime = buf->st_ctime;
  261         lbuf.st_blksize = buf->st_blksize;
  262         lbuf.st_blocks = buf->st_blocks;
  263         lbuf.st_flags = buf->st_flags;
  264         lbuf.st_gen = buf->st_gen;
  265 
  266         return (copyout(&lbuf, ubuf, sizeof(lbuf)));
  267 }
  268 
  269 int
  270 linux_stat(struct thread *td, struct linux_stat_args *args)
  271 {
  272         struct stat buf;
  273         int error;
  274 #ifdef DEBUG
  275         if (ldebug(stat))
  276         printf(ARGS(stat, "%s, *"), args->path);
  277 #endif
  278         error = kern_stat(td, args->path, UIO_SYSSPACE, &buf);
  279         if (error)
  280                 return (error);
  281         translate_path_major_minor(td, args->path, &buf);
  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         int error;
  290 
  291 #ifdef DEBUG
  292         if (ldebug(lstat))
  293         printf(ARGS(lstat, "%s, *"), args->path);
  294 #endif
  295         error = kern_lstat(td, args->path, UIO_SYSSPACE, &buf);
  296         if (error)
  297                 return (error);
  298         translate_path_major_minor(td, args->path, &buf);
  299         return(stat_copyout(&buf, args->up));
  300 }
  301 
  302 /* XXX - All fields of type l_int are defined as l_long on i386 */
  303 struct l_statfs {
  304         l_int           f_type;
  305         l_int           f_bsize;
  306         l_int           f_blocks;
  307         l_int           f_bfree;
  308         l_int           f_bavail;
  309         l_int           f_files;
  310         l_int           f_ffree;
  311         l_fsid_t        f_fsid;
  312         l_int           f_namelen;
  313         l_int           f_spare[6];
  314 };
  315 
  316 #define LINUX_CODA_SUPER_MAGIC  0x73757245L
  317 #define LINUX_EXT2_SUPER_MAGIC  0xEF53L
  318 #define LINUX_HPFS_SUPER_MAGIC  0xf995e849L
  319 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L
  320 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L
  321 #define LINUX_NCP_SUPER_MAGIC   0x564cL
  322 #define LINUX_NFS_SUPER_MAGIC   0x6969L
  323 #define LINUX_NTFS_SUPER_MAGIC  0x5346544EL
  324 #define LINUX_PROC_SUPER_MAGIC  0x9fa0L
  325 #define LINUX_UFS_SUPER_MAGIC   0x00011954L     /* XXX - UFS_MAGIC in Linux */
  326 #define LINUX_DEVFS_SUPER_MAGIC 0x1373L
  327 
  328 static long
  329 bsd_to_linux_ftype(const char *fstypename)
  330 {
  331         int i;
  332         static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = {
  333                 {"ufs",     LINUX_UFS_SUPER_MAGIC},
  334                 {"cd9660",  LINUX_ISOFS_SUPER_MAGIC},
  335                 {"nfs",     LINUX_NFS_SUPER_MAGIC},
  336                 {"ext2fs",  LINUX_EXT2_SUPER_MAGIC},
  337                 {"procfs",  LINUX_PROC_SUPER_MAGIC},
  338                 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC},
  339                 {"ntfs",    LINUX_NTFS_SUPER_MAGIC},
  340                 {"nwfs",    LINUX_NCP_SUPER_MAGIC},
  341                 {"hpfs",    LINUX_HPFS_SUPER_MAGIC},
  342                 {"coda",    LINUX_CODA_SUPER_MAGIC},
  343                 {"devfs",   LINUX_DEVFS_SUPER_MAGIC},
  344                 {NULL,      0L}};
  345 
  346         for (i = 0; b2l_tbl[i].bsd_name != NULL; i++)
  347                 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0)
  348                         return (b2l_tbl[i].linux_type);
  349 
  350         return (0L);
  351 }
  352 
  353 static void
  354 bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs)
  355 {
  356 
  357         linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
  358         linux_statfs->f_bsize = bsd_statfs->f_bsize;
  359         linux_statfs->f_blocks = bsd_statfs->f_blocks;
  360         linux_statfs->f_bfree = bsd_statfs->f_bfree;
  361         linux_statfs->f_bavail = bsd_statfs->f_bavail;
  362         linux_statfs->f_ffree = bsd_statfs->f_ffree;
  363         linux_statfs->f_files = bsd_statfs->f_files;
  364         linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
  365         linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
  366         linux_statfs->f_namelen = MAXNAMLEN;
  367 }
  368 
  369 int
  370 linux_statfs(struct thread *td, struct linux_statfs_args *args)
  371 {
  372         struct l_statfs linux_statfs;
  373         struct statfs bsd_statfs;
  374         char *path;
  375         int error;
  376 
  377         LCONVPATHEXIST(td, args->path, &path);
  378 
  379 #ifdef DEBUG
  380         if (ldebug(statfs))
  381                 printf(ARGS(statfs, "%s, *"), path);
  382 #endif
  383         error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
  384         LFREEPATH(path);
  385         if (error)
  386                 return (error);
  387         bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
  388         return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
  389 }
  390 
  391 static void
  392 bsd_to_linux_statfs64(struct statfs *bsd_statfs, struct l_statfs64 *linux_statfs)
  393 {
  394 
  395         linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
  396         linux_statfs->f_bsize = bsd_statfs->f_bsize;
  397         linux_statfs->f_blocks = bsd_statfs->f_blocks;
  398         linux_statfs->f_bfree = bsd_statfs->f_bfree;
  399         linux_statfs->f_bavail = bsd_statfs->f_bavail;
  400         linux_statfs->f_ffree = bsd_statfs->f_ffree;
  401         linux_statfs->f_files = bsd_statfs->f_files;
  402         linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
  403         linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
  404         linux_statfs->f_namelen = MAXNAMLEN;
  405 }
  406 
  407 int
  408 linux_statfs64(struct thread *td, struct linux_statfs64_args *args)
  409 {
  410         struct l_statfs64 linux_statfs;
  411         struct statfs bsd_statfs;
  412         char *path;
  413         int error;
  414 
  415         if (args->bufsize != sizeof(struct l_statfs64))
  416                 return EINVAL;
  417 
  418         LCONVPATHEXIST(td, args->path, &path);
  419 
  420 #ifdef DEBUG
  421         if (ldebug(statfs64))
  422                 printf(ARGS(statfs64, "%s, *"), path);
  423 #endif
  424         error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
  425         LFREEPATH(path);
  426         if (error)
  427                 return (error);
  428         bsd_to_linux_statfs64(&bsd_statfs, &linux_statfs);
  429         return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
  430 }
  431 
  432 int
  433 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args)
  434 {
  435         struct l_statfs linux_statfs;
  436         struct statfs bsd_statfs;
  437         int error;
  438 
  439 #ifdef DEBUG
  440         if (ldebug(fstatfs))
  441                 printf(ARGS(fstatfs, "%d, *"), args->fd);
  442 #endif
  443         error = kern_fstatfs(td, args->fd, &bsd_statfs);
  444         if (error)
  445                 return error;
  446         bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
  447         return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
  448 }
  449 
  450 struct l_ustat
  451 {
  452         l_daddr_t       f_tfree;
  453         l_ino_t         f_tinode;
  454         char            f_fname[6];
  455         char            f_fpack[6];
  456 };
  457 
  458 int
  459 linux_ustat(struct thread *td, struct linux_ustat_args *args)
  460 {
  461 #ifdef DEBUG
  462         if (ldebug(ustat))
  463                 printf(ARGS(ustat, "%d, *"), args->dev);
  464 #endif
  465 
  466         return (EOPNOTSUPP);
  467 }
  468 
  469 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  470 
  471 static int
  472 stat64_copyout(struct stat *buf, void *ubuf)
  473 {
  474         struct l_stat64 lbuf;
  475 
  476         bzero(&lbuf, sizeof(lbuf));
  477         lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
  478         lbuf.st_ino = buf->st_ino;
  479         lbuf.st_mode = buf->st_mode;
  480         lbuf.st_nlink = buf->st_nlink;
  481         lbuf.st_uid = buf->st_uid;
  482         lbuf.st_gid = buf->st_gid;
  483         lbuf.st_rdev = buf->st_rdev;
  484         lbuf.st_size = buf->st_size;
  485         lbuf.st_atime = buf->st_atime;
  486         lbuf.st_mtime = buf->st_mtime;
  487         lbuf.st_ctime = buf->st_ctime;
  488         lbuf.st_blksize = buf->st_blksize;
  489         lbuf.st_blocks = buf->st_blocks;
  490 
  491         /*
  492          * The __st_ino field makes all the difference. In the Linux kernel
  493          * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO,
  494          * but without the assignment to __st_ino the runtime linker refuses
  495          * to mmap(2) any shared libraries. I guess it's broken alright :-)
  496          */
  497         lbuf.__st_ino = buf->st_ino;
  498 
  499         return (copyout(&lbuf, ubuf, sizeof(lbuf)));
  500 }
  501 
  502 int
  503 linux_stat64(struct thread *td, struct linux_stat64_args *args)
  504 {
  505         struct stat buf;
  506         char *filename;
  507         int error;
  508 
  509         LCONVPATHEXIST(td, args->filename, &filename);
  510 
  511 #ifdef DEBUG
  512         if (ldebug(stat64))
  513                 printf(ARGS(stat64, "%s, *"), filename);
  514 #endif
  515 
  516         error = kern_stat(td, filename, UIO_SYSSPACE, &buf);
  517         if (!error) {
  518                 if (strlen(filename) > strlen("/dev/pts/") &&
  519                     !strncmp(filename, "/dev/pts/", strlen("/dev/pts/")) &&
  520                     filename[9] >= '' && filename[9] <= '9') {
  521                         /*
  522                          * Linux checks major and minors of the slave device
  523                          * to make sure it's a pty deivce, so let's make him
  524                          * believe it is.
  525                          */
  526                         buf.st_rdev = (136 << 8);
  527                 } else
  528                         translate_path_major_minor(td, filename, &buf);
  529         }
  530         LFREEPATH(filename);
  531         if (error)
  532                 return (error);
  533         return (stat64_copyout(&buf, args->statbuf));
  534 }
  535 
  536 int
  537 linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
  538 {
  539         struct stat sb;
  540         char *filename;
  541         int error;
  542 
  543         LCONVPATHEXIST(td, args->filename, &filename);
  544 
  545 #ifdef DEBUG
  546         if (ldebug(lstat64))
  547                 printf(ARGS(lstat64, "%s, *"), args->filename);
  548 #endif
  549 
  550         error = kern_lstat(td, filename, UIO_SYSSPACE, &sb);
  551         if (!error)
  552                 translate_path_major_minor(td, filename, &sb);
  553         LFREEPATH(filename);
  554         if (error)
  555                 return (error);
  556         return (stat64_copyout(&sb, args->statbuf));
  557 }
  558 
  559 int
  560 linux_fstat64(struct thread *td, struct linux_fstat64_args *args)
  561 {
  562         struct stat buf;
  563         int error;
  564 
  565 #ifdef DEBUG
  566         if (ldebug(fstat64))
  567                 printf(ARGS(fstat64, "%d, *"), args->fd);
  568 #endif
  569 
  570         error = kern_fstat(td, args->fd, &buf);
  571         translate_fd_major_minor(td, args->fd, &buf);
  572         if (!error)
  573                 error = stat64_copyout(&buf, args->statbuf);
  574 
  575         return (error);
  576 }
  577 
  578 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */

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