FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/lib/libspl/os/linux/getmntany.c

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License, Version 1.0 only
      * (the "License").  You may not use this file except in compliance
      * with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
     * Copyright 2006 Ricardo Correia.  All rights reserved.
     * Use is subject to license terms.
     */
    
    /*      Copyright (c) 1988 AT&T */
    /*        All Rights Reserved   */
    
    #include <stdio.h>
    #include <string.h>
    #include <mntent.h>
    #include <sys/errno.h>
    #include <sys/mnttab.h>
    
    #include <sys/types.h>
    #include <sys/sysmacros.h>
    #include <sys/stat.h>
    #include <unistd.h>
    
    #define BUFSIZE (MNT_LINE_MAX + 2)
    
    static __thread char buf[BUFSIZE];
    
    #define DIFF(xx)        ( \
                (mrefp->xx != NULL) && \
                (mgetp->xx == NULL || strcmp(mrefp->xx, mgetp->xx) != 0))
    
    int
    getmntany(FILE *fp, struct mnttab *mgetp, struct mnttab *mrefp)
    {
            int ret;
    
            while (
                ((ret = _sol_getmntent(fp, mgetp)) == 0) && (
                DIFF(mnt_special) || DIFF(mnt_mountp) ||
                DIFF(mnt_fstype) || DIFF(mnt_mntopts))) { }
    
            return (ret);
    }
    
    int
    _sol_getmntent(FILE *fp, struct mnttab *mgetp)
    {
            struct mntent mntbuf;
            struct mntent *ret;
    
            ret = getmntent_r(fp, &mntbuf, buf, BUFSIZE);
    
            if (ret != NULL) {
                    mgetp->mnt_special = mntbuf.mnt_fsname;
                    mgetp->mnt_mountp = mntbuf.mnt_dir;
                    mgetp->mnt_fstype = mntbuf.mnt_type;
                    mgetp->mnt_mntopts = mntbuf.mnt_opts;
                    return (0);
            }
    
            if (feof(fp))
                    return (-1);
    
            return (MNT_TOOLONG);
    }
    
    static int
    getextmntent_impl(FILE *fp, struct extmnttab *mp)
    {
            int ret;
            struct stat64 st;
    
            ret = _sol_getmntent(fp, (struct mnttab *)mp);
            if (ret == 0) {
                    if (stat64(mp->mnt_mountp, &st) != 0) {
                            mp->mnt_major = 0;
                            mp->mnt_minor = 0;
                            return (ret);
                    }
                    mp->mnt_major = major(st.st_dev);
                    mp->mnt_minor = minor(st.st_dev);
           }
   
           return (ret);
   }
   
   int
   getextmntent(const char *path, struct extmnttab *entry, struct stat64 *statbuf)
   {
           struct stat64 st;
           FILE *fp;
           int match;
   
           if (strlen(path) >= MAXPATHLEN) {
                   (void) fprintf(stderr, "invalid object; pathname too long\n");
                   return (-1);
           }
   
           /*
            * Search for the path in /proc/self/mounts. Rather than looking for the
            * specific path, which can be fooled by non-standard paths (i.e. ".."
            * or "//"), we stat() the path and search for the corresponding
            * (major,minor) device pair.
            */
           if (stat64(path, statbuf) != 0) {
                   (void) fprintf(stderr, "cannot open '%s': %s\n",
                       path, strerror(errno));
                   return (-1);
           }
   
   
           if ((fp = fopen(MNTTAB, "re")) == NULL) {
                   (void) fprintf(stderr, "cannot open %s\n", MNTTAB);
                   return (-1);
           }
   
           /*
            * Search for the given (major,minor) pair in the mount table.
            */
   
           match = 0;
           while (getextmntent_impl(fp, entry) == 0) {
                   if (makedev(entry->mnt_major, entry->mnt_minor) ==
                       statbuf->st_dev) {
                           match = 1;
                           break;
                   }
           }
           (void) fclose(fp);
   
           if (!match) {
                   (void) fprintf(stderr, "cannot find mountpoint for '%s'\n",
                       path);
                   return (-1);
           }
   
           if (stat64(entry->mnt_mountp, &st) != 0) {
                   entry->mnt_major = 0;
                   entry->mnt_minor = 0;
                   return (-1);
           }
   
           return (0);
   }

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