write_dos_attributes.c

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    1 /*
    2  * This file and its contents are supplied under the terms of the
    3  * Common Development and Distribution License ("CDDL"), version 1.0.
    4  * You may only use this file in accordance with the terms of version
    5  * 1.0 of the CDDL.
    6  *
    7  * A full copy of the text of the CDDL should have accompanied this
    8  * source.  A copy of the CDDL is also available via the Internet at
    9  * http://www.illumos.org/license/CDDL.
   10  */
   11 
   12 /*
   13  * Copyright 2022 iXsystems, Inc.
   14  */
   15 
   16 /*
   17  * FreeBSD exposes additional file attributes via ls -o and chflags.
   18  * Under Linux, we provide ZFS_IOC_[GS]ETDOSFLAGS ioctl()s.
   19  *
   20  * This application is equivalent to FreeBSD chflags.
   21  */
   22 
   23 #include <err.h>
   24 #include <fcntl.h>
   25 #include <stdio.h>
   26 #include <stdlib.h>
   27 #include <stdbool.h>
   28 #include <sys/types.h>
   29 #include <sys/stat.h>
   30 #include <sys/ioctl.h>
   31 #include <sys/fs/zfs.h>
   32 #include "dos_attributes.h"
   33 
   34 int
   35 main(int argc, const char *const *argv)
   36 {
   37         if (argc != 3)
   38                 errx(EXIT_FAILURE, "usage: %s flag file", argv[0]);
   39 
   40         bool unset = false;
   41         uint64_t attr = 0;
   42         const char *flag = argv[1];
   43         if (strcmp(flag, "") == 0)
   44                 ;
   45         else if (strcmp(flag, SU_NODUMP) == 0)
   46                 attr = ZFS_NODUMP;
   47         else if (strcmp(flag, UNSET_NODUMP) == 0) {
   48                 attr = ZFS_NODUMP;
   49                 unset = true;
   50         } else {
   51                 if (strncmp(flag, "no", 2) == 0) {
   52                         unset = true;
   53                         flag += 2;
   54                 }
   55                 for (size_t i = 0; i < ARRAY_SIZE(all_dos_attribute_names); ++i)
   56                         for (const char *const *nm = all_dos_attribute_names[i];
   57                             *nm; ++nm)
   58                                 if (strcmp(flag, *nm) == 0) {
   59                                         attr = all_dos_attributes[i];
   60                                         goto found;
   61                                 }
   62 
   63                 errx(EXIT_FAILURE, "%s: unknown flag", argv[1]);
   64 found:;
   65         }
   66 
   67         int fd = open(argv[2], O_RDWR | O_APPEND | O_CLOEXEC);
   68         if (fd == -1)
   69                 err(EXIT_FAILURE, "%s", argv[2]);
   70 
   71         uint64_t flags;
   72         if (ioctl(fd, ZFS_IOC_GETDOSFLAGS, &flags) == -1)
   73                 err(EXIT_FAILURE, "ZFS_IOC_GETDOSFLAGS");
   74 
   75         if (attr == 0)
   76                 flags = 0;
   77         else if (unset)
   78                 flags &= ~attr;
   79         else
   80                 flags |= attr;
   81 
   82         if (ioctl(fd, ZFS_IOC_SETDOSFLAGS, &flags) == -1)
   83                 err(EXIT_FAILURE, "ZFS_IOC_SETDOSFLAGS");
   84 
   85         uint64_t newflags;
   86         if (ioctl(fd, ZFS_IOC_GETDOSFLAGS, &newflags) == -1)
   87                 err(EXIT_FAILURE, "second ZFS_IOC_GETDOSFLAGS");
   88 
   89         if (newflags != flags)
   90                 errx(EXIT_FAILURE, "expecting %#" PRIx64 ", got %#" PRIx64
   91                     "; %ssetting %#" PRIx64 "",
   92                     flags, newflags, unset ? "un" : "", attr);
   93 
   94         (void) printf("%#" PRIx64 "\n", flags);
   95 }

Cache object: c5e4810bfab06873aa82d6eb8a304372

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/tests/zfs-tests/cmd/linux_dos_attributes/write_dos_attributes.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/tests/zfs-tests/cmd/linux_dos_attributes/write_dos_attributes.c