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/6.0/sys/compat/linux/linux_stats.c 147559 2005-06-23 22:13:29Z pjd $");
   31 
   32 #include "opt_mac.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/dirent.h>
   36 #include <sys/file.h>
   37 #include <sys/filedesc.h>
   38 #include <sys/proc.h>
   39 #include <sys/jail.h>
   40 #include <sys/mac.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 
   49 #include "opt_compat.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 /*
   62  * XXX: This was removed from newstat_copyout(), and almost identical
   63  * XXX: code was in stat64_copyout().  findcdev() needs to be replaced
   64  * XXX: with something that does lookup and locking properly.
   65  * XXX: When somebody fixes this: please try to avoid duplicating it.
   66  */
   67 #if 0
   68 static void
   69 disk_foo(struct somestat *tbuf)
   70 {
   71         struct cdevsw *cdevsw;
   72         struct cdev *dev;
   73 
   74         /* Lie about disk drives which are character devices
   75          * in FreeBSD but block devices under Linux.
   76          */
   77         if (S_ISCHR(tbuf.st_mode) &&
   78             (dev = findcdev(buf->st_rdev)) != NULL) {
   79                 cdevsw = dev_refthread(dev);
   80                 if (cdevsw != NULL) {
   81                         if (cdevsw->d_flags & D_DISK) {
   82                                 tbuf.st_mode &= ~S_IFMT;
   83                                 tbuf.st_mode |= S_IFBLK;
   84 
   85                                 /* XXX this may not be quite right */
   86                                 /* Map major number to 0 */
   87                                 tbuf.st_dev = uminor(buf->st_dev) & 0xf;
   88                                 tbuf.st_rdev = buf->st_rdev & 0xff;
   89                         }
   90                         dev_relthread(dev);
   91                 }
   92         }
   93 
   94 }
   95 #endif
   96 
   97 static int
   98 newstat_copyout(struct stat *buf, void *ubuf)
   99 {
  100         struct l_newstat tbuf;
  101 
  102         bzero(&tbuf, sizeof(tbuf));
  103         tbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
  104         tbuf.st_ino = buf->st_ino;
  105         tbuf.st_mode = buf->st_mode;
  106         tbuf.st_nlink = buf->st_nlink;
  107         tbuf.st_uid = buf->st_uid;
  108         tbuf.st_gid = buf->st_gid;
  109         tbuf.st_rdev = buf->st_rdev;
  110         tbuf.st_size = buf->st_size;
  111         tbuf.st_atime = buf->st_atime;
  112         tbuf.st_mtime = buf->st_mtime;
  113         tbuf.st_ctime = buf->st_ctime;
  114         tbuf.st_blksize = buf->st_blksize;
  115         tbuf.st_blocks = buf->st_blocks;
  116 
  117         return (copyout(&tbuf, ubuf, sizeof(tbuf)));
  118 }
  119 
  120 int
  121 linux_newstat(struct thread *td, struct linux_newstat_args *args)
  122 {
  123         struct stat buf;
  124         char *path;
  125         int error;
  126 
  127         LCONVPATHEXIST(td, args->path, &path);
  128 
  129 #ifdef DEBUG
  130         if (ldebug(newstat))
  131                 printf(ARGS(newstat, "%s, *"), path);
  132 #endif
  133 
  134         error = kern_stat(td, path, UIO_SYSSPACE, &buf);
  135         LFREEPATH(path);
  136         if (error)
  137                 return (error);
  138         return (newstat_copyout(&buf, args->buf));
  139 }
  140 
  141 int
  142 linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
  143 {
  144         struct stat sb;
  145         char *path;
  146         int error;
  147 
  148         LCONVPATHEXIST(td, args->path, &path);
  149 
  150 #ifdef DEBUG
  151         if (ldebug(newlstat))
  152                 printf(ARGS(newlstat, "%s, *"), path);
  153 #endif
  154 
  155         error = kern_lstat(td, path, UIO_SYSSPACE, &sb);
  156         LFREEPATH(path);
  157         if (error)
  158                 return (error);
  159         return (newstat_copyout(&sb, args->buf));
  160 }
  161 
  162 int
  163 linux_newfstat(struct thread *td, struct linux_newfstat_args *args)
  164 {
  165         struct stat buf;
  166         int error;
  167 
  168 #ifdef DEBUG
  169         if (ldebug(newfstat))
  170                 printf(ARGS(newfstat, "%d, *"), args->fd);
  171 #endif
  172 
  173         error = kern_fstat(td, args->fd, &buf);
  174         if (!error)
  175                 error = newstat_copyout(&buf, args->buf);
  176 
  177         return (error);
  178 }
  179 
  180 /* XXX - All fields of type l_int are defined as l_long on i386 */
  181 struct l_statfs {
  182         l_int           f_type;
  183         l_int           f_bsize;
  184         l_int           f_blocks;
  185         l_int           f_bfree;
  186         l_int           f_bavail;
  187         l_int           f_files;
  188         l_int           f_ffree;
  189         l_fsid_t        f_fsid;
  190         l_int           f_namelen;
  191         l_int           f_spare[6];
  192 };
  193 
  194 #define LINUX_CODA_SUPER_MAGIC  0x73757245L
  195 #define LINUX_EXT2_SUPER_MAGIC  0xEF53L
  196 #define LINUX_HPFS_SUPER_MAGIC  0xf995e849L
  197 #define LINUX_ISOFS_SUPER_MAGIC 0x9660L
  198 #define LINUX_MSDOS_SUPER_MAGIC 0x4d44L
  199 #define LINUX_NCP_SUPER_MAGIC   0x564cL
  200 #define LINUX_NFS_SUPER_MAGIC   0x6969L
  201 #define LINUX_NTFS_SUPER_MAGIC  0x5346544EL
  202 #define LINUX_PROC_SUPER_MAGIC  0x9fa0L
  203 #define LINUX_UFS_SUPER_MAGIC   0x00011954L     /* XXX - UFS_MAGIC in Linux */
  204 
  205 static long
  206 bsd_to_linux_ftype(const char *fstypename)
  207 {
  208         int i;
  209         static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = {
  210                 {"ufs",     LINUX_UFS_SUPER_MAGIC},
  211                 {"cd9660",  LINUX_ISOFS_SUPER_MAGIC},
  212                 {"nfs",     LINUX_NFS_SUPER_MAGIC},
  213                 {"ext2fs",  LINUX_EXT2_SUPER_MAGIC},
  214                 {"procfs",  LINUX_PROC_SUPER_MAGIC},
  215                 {"msdosfs", LINUX_MSDOS_SUPER_MAGIC},
  216                 {"ntfs",    LINUX_NTFS_SUPER_MAGIC},
  217                 {"nwfs",    LINUX_NCP_SUPER_MAGIC},
  218                 {"hpfs",    LINUX_HPFS_SUPER_MAGIC},
  219                 {"coda",    LINUX_CODA_SUPER_MAGIC},
  220                 {NULL,      0L}};
  221 
  222         for (i = 0; b2l_tbl[i].bsd_name != NULL; i++)
  223                 if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0)
  224                         return (b2l_tbl[i].linux_type);
  225 
  226         return (0L);
  227 }
  228 
  229 static void
  230 bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs)
  231 {
  232 
  233         linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
  234         linux_statfs->f_bsize = bsd_statfs->f_bsize;
  235         linux_statfs->f_blocks = bsd_statfs->f_blocks;
  236         linux_statfs->f_bfree = bsd_statfs->f_bfree;
  237         linux_statfs->f_bavail = bsd_statfs->f_bavail;
  238         linux_statfs->f_ffree = bsd_statfs->f_ffree;
  239         linux_statfs->f_files = bsd_statfs->f_files;
  240         linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
  241         linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
  242         linux_statfs->f_namelen = MAXNAMLEN;
  243 }
  244 
  245 int
  246 linux_statfs(struct thread *td, struct linux_statfs_args *args)
  247 {
  248         struct l_statfs linux_statfs;
  249         struct statfs bsd_statfs;
  250         char *path;
  251         int error;
  252 
  253         LCONVPATHEXIST(td, args->path, &path);
  254 
  255 #ifdef DEBUG
  256         if (ldebug(statfs))
  257                 printf(ARGS(statfs, "%s, *"), path);
  258 #endif
  259         error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
  260         LFREEPATH(path);
  261         if (error)
  262                 return (error);
  263         bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
  264         return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
  265 }
  266 
  267 int
  268 linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args)
  269 {
  270         struct l_statfs linux_statfs;
  271         struct statfs bsd_statfs;
  272         int error;
  273 
  274 #ifdef DEBUG
  275         if (ldebug(fstatfs))
  276                 printf(ARGS(fstatfs, "%d, *"), args->fd);
  277 #endif
  278         error = kern_fstatfs(td, args->fd, &bsd_statfs);
  279         if (error)
  280                 return error;
  281         bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
  282         return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
  283 }
  284 
  285 struct l_ustat
  286 {
  287         l_daddr_t       f_tfree;
  288         l_ino_t         f_tinode;
  289         char            f_fname[6];
  290         char            f_fpack[6];
  291 };
  292 
  293 int
  294 linux_ustat(struct thread *td, struct linux_ustat_args *args)
  295 {
  296 #ifdef DEBUG
  297         if (ldebug(ustat))
  298                 printf(ARGS(ustat, "%d, *"), args->dev);
  299 #endif
  300 
  301         return (EOPNOTSUPP);
  302 
  303 #ifdef not_that_way
  304         struct l_ustat lu;
  305         struct cdev *dev;
  306         struct vnode *vp;
  307         struct statfs *stat;
  308         int error;
  309 
  310 
  311         /*
  312          * lu.f_fname and lu.f_fpack are not used. They are always zeroed.
  313          * lu.f_tinode and lu.f_tfree are set from the device's super block.
  314          */
  315         bzero(&lu, sizeof(lu));
  316 
  317         /*
  318          * XXX - Don't return an error if we can't find a vnode for the
  319          * device. Our struct cdev *is 32-bits whereas Linux only has a 16-bits
  320          * struct cdev *. The struct cdev *that is used now may as well be a truncated
  321          * struct cdev *returned from previous syscalls. Just return a bzeroed
  322          * ustat in that case.
  323          *
  324          * XXX: findcdev() SHALL not be used this way.  Somebody (TM) will
  325          *      have to find a better way.  It may be that we should stick
  326          *      a dev_t into struct mount, and walk the mountlist for a
  327          *      perfect match and failing that try again looking for a
  328          *      minor-truncated match.
  329          */
  330         dev = findcdev(makedev(args->dev >> 8, args->dev & 0xFF));
  331         if (dev != NULL && vfinddev(dev, &vp)) {
  332                 if (vp->v_mount == NULL)
  333                         return (EINVAL);
  334 #ifdef MAC
  335                 error = mac_check_mount_stat(td->td_ucred, vp->v_mount);
  336                 if (error)
  337                         return (error);
  338 #endif
  339                 stat = &(vp->v_mount->mnt_stat);
  340                 error = VFS_STATFS(vp->v_mount, stat, td);
  341                 if (error)
  342                         return (error);
  343 
  344                 lu.f_tfree = stat->f_bfree;
  345                 lu.f_tinode = stat->f_ffree;
  346         }
  347 
  348         return (copyout(&lu, args->ubuf, sizeof(lu)));
  349 #endif
  350 }
  351 
  352 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  353 
  354 static int
  355 stat64_copyout(struct stat *buf, void *ubuf)
  356 {
  357         struct l_stat64 lbuf;
  358 
  359         bzero(&lbuf, sizeof(lbuf));
  360         lbuf.st_dev = uminor(buf->st_dev) | (umajor(buf->st_dev) << 8);
  361         lbuf.st_ino = buf->st_ino;
  362         lbuf.st_mode = buf->st_mode;
  363         lbuf.st_nlink = buf->st_nlink;
  364         lbuf.st_uid = buf->st_uid;
  365         lbuf.st_gid = buf->st_gid;
  366         lbuf.st_rdev = buf->st_rdev;
  367         lbuf.st_size = buf->st_size;
  368         lbuf.st_atime = buf->st_atime;
  369         lbuf.st_mtime = buf->st_mtime;
  370         lbuf.st_ctime = buf->st_ctime;
  371         lbuf.st_blksize = buf->st_blksize;
  372         lbuf.st_blocks = buf->st_blocks;
  373 
  374         /*
  375          * The __st_ino field makes all the difference. In the Linux kernel
  376          * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO,
  377          * but without the assignment to __st_ino the runtime linker refuses
  378          * to mmap(2) any shared libraries. I guess it's broken alright :-)
  379          */
  380         lbuf.__st_ino = buf->st_ino;
  381 
  382         return (copyout(&lbuf, ubuf, sizeof(lbuf)));
  383 }
  384 
  385 int
  386 linux_stat64(struct thread *td, struct linux_stat64_args *args)
  387 {
  388         struct stat buf;
  389         char *filename;
  390         int error;
  391 
  392         LCONVPATHEXIST(td, args->filename, &filename);
  393 
  394 #ifdef DEBUG
  395         if (ldebug(stat64))
  396                 printf(ARGS(stat64, "%s, *"), filename);
  397 #endif
  398 
  399         error = kern_stat(td, filename, UIO_SYSSPACE, &buf);
  400         LFREEPATH(filename);
  401         if (error)
  402                 return (error);
  403         return (stat64_copyout(&buf, args->statbuf));
  404 }
  405 
  406 int
  407 linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
  408 {
  409         struct stat sb;
  410         char *filename;
  411         int error;
  412 
  413         LCONVPATHEXIST(td, args->filename, &filename);
  414 
  415 #ifdef DEBUG
  416         if (ldebug(lstat64))
  417                 printf(ARGS(lstat64, "%s, *"), args->filename);
  418 #endif
  419 
  420         error = kern_lstat(td, filename, UIO_SYSSPACE, &sb);
  421         LFREEPATH(filename);
  422         if (error)
  423                 return (error);
  424         return (stat64_copyout(&sb, args->statbuf));
  425 }
  426 
  427 int
  428 linux_fstat64(struct thread *td, struct linux_fstat64_args *args)
  429 {
  430         struct stat buf;
  431         int error;
  432 
  433 #ifdef DEBUG
  434         if (ldebug(fstat64))
  435                 printf(ARGS(fstat64, "%d, *"), args->fd);
  436 #endif
  437 
  438         error = kern_fstat(td, args->fd, &buf);
  439         if (!error)
  440                 error = stat64_copyout(&buf, args->statbuf);
  441 
  442         return (error);
  443 }
  444 
  445 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */

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