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Expose additional file level attributes
ZFS allows to update and retrieve additional file level attributes for FreeBSD. This commit allows additional file level attributes to be updated and retrieved for Linux. These include the flags stored in the upper half of z_pflags only. Two new IOCTLs have been added for this purpose. ZFS_IOC_GETDOSFLAGS can be used to retrieve the attributes, while ZFS_IOC_SETDOSFLAGS can be used to update the attributes. Attributes that are allowed to be updated include ZFS_IMMUTABLE, ZFS_APPENDONLY, ZFS_NOUNLINK, ZFS_ARCHIVE, ZFS_NODUMP, ZFS_SYSTEM, ZFS_HIDDEN, ZFS_READONLY, ZFS_REPARSE, ZFS_OFFLINE and ZFS_SPARSE. Flags can be or'd together while calling ZFS_IOC_SETDOSFLAGS. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Umer Saleem <usaleem@ixsystems.com> Closes #13118
This commit is contained in:
Umer Saleem
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/write_dos_attributes
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include $(top_srcdir)/config/Rules.am
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pkgexecdir = $(datadir)/@PACKAGE@/zfs-tests/bin
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pkgexec_PROGRAMS = write_dos_attributes
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write_dos_attributes_SOURCES = write_dos_attributes.c
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/*
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* This file and its contents are supplied under the terms of the
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* Common Development and Distribution License ("CDDL"), version 1.0.
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* You may only use this file in accordance with the terms of version
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* 1.0 of the CDDL.
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*
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* A full copy of the text of the CDDL should have accompanied this
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* source. A copy of the CDDL is also available via the Internet at
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* http://www.illumos.org/license/CDDL.
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*/
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/*
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* Copyright 2022 iXsystems, Inc.
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*/
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/*
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* FreeBSD allows to update and retreive additional file level attributes.
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* For Linux, two IOCTLs have been added to update and retrieve additional
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* level attributes.
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*
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* This application updates additional file level attributes on a given
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* file. FreeBSD keywords can be used to specify the flag.
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*
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* Usage: 'write_dos_attributes flag filepath'
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <err.h>
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#include <sys/fs/zfs.h>
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#include <string.h>
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#include <ctype.h>
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#define SU_ARCH_SHORT "arch"
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#define SU_ARCH_FULL "archived"
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#define SU_NODUMP "nodump"
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#define SU_APPEND_SHORT "sappnd"
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#define SU_APPEND_FULL "sappend"
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#define SU_IMMUTABLE "schg"
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#define SU_IMMUTABLE_SHORT "schange"
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#define SU_IMMUTABLE_FULL "simmutable"
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#define SU_UNLINK_SHORT "sunlnk"
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#define SU_UNLINK_FULL "sunlink"
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#define U_APPEND_SHORT "uappnd"
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#define U_APPEND_FULL "uappend"
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#define U_ARCH_SHORT "uarch"
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#define U_ARCH_FULL "uarchive"
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#define U_IMMUTABLE "uchg"
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#define U_IMMUTABLE_SHORT "uchange"
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#define U_IMMUTABLE_FULL "uimmutable"
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#define U_HIDDEN_SHORT "hidden"
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#define U_HIDDEN_FULL "uhidden"
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#define U_OFFLINE_SHORT "offline"
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#define U_OFFLINE_FULL "uoffline"
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#define U_RDONLY "rdonly"
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#define U_RDONLY_SHORT "urdonly"
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#define U_RDONLY_FULL "readonly"
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#define U_SPARSE_SHORT "sparse"
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#define U_SPARSE_FULL "usparse"
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#define U_SYSTEM_SHORT "system"
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#define U_SYSTEM_FULL "usystem"
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#define U_REPARSE_SHORT "reparse"
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#define U_REPARSE_FULL "ureparse"
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#define U_UNLINK_SHORT "uunlnk"
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#define U_UNLINK_FULL "uunlink"
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#define UNSET_NODUMP "dump"
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#define IS_NO(s) (s[0] == 'n' && s[1] == 'o')
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uint64_t str_to_attribute(char *str);
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uint64_t
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str_to_attribute(char *str)
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{
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if ((strcmp(str, SU_ARCH_SHORT) == 0) ||
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(strcmp(str, SU_ARCH_FULL) == 0) ||
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(strcmp(str, U_ARCH_SHORT) == 0) ||
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(strcmp(str, U_ARCH_FULL) == 0))
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return (ZFS_ARCHIVE);
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else if ((strcmp(str, SU_APPEND_SHORT) == 0) ||
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(strcmp(str, SU_APPEND_FULL) == 0) ||
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(strcmp(str, U_APPEND_SHORT) == 0) ||
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(strcmp(str, U_APPEND_FULL) == 0))
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return (ZFS_APPENDONLY);
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else if ((strcmp(str, SU_IMMUTABLE) == 0) ||
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(strcmp(str, SU_IMMUTABLE_SHORT) == 0) ||
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(strcmp(str, SU_IMMUTABLE_FULL) == 0))
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return (ZFS_IMMUTABLE);
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else if ((strcmp(str, SU_UNLINK_SHORT) == 0) ||
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(strcmp(str, SU_UNLINK_FULL) == 0) ||
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(strcmp(str, U_UNLINK_SHORT) == 0) ||
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(strcmp(str, SU_UNLINK_FULL) == 0))
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return (ZFS_NOUNLINK);
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else if ((strcmp(str, U_HIDDEN_SHORT) == 0) ||
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(strcmp(str, U_HIDDEN_FULL) == 0))
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return (ZFS_HIDDEN);
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else if ((strcmp(str, U_OFFLINE_SHORT) == 0) ||
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(strcmp(str, U_OFFLINE_FULL) == 0))
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return (ZFS_OFFLINE);
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else if ((strcmp(str, U_RDONLY) == 0) ||
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(strcmp(str, U_RDONLY_SHORT) == 0) ||
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(strcmp(str, U_RDONLY_FULL) == 0))
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return (ZFS_READONLY);
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else if ((strcmp(str, U_SPARSE_SHORT) == 0) ||
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(strcmp(str, U_SPARSE_FULL) == 0))
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return (ZFS_SPARSE);
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else if ((strcmp(str, U_SYSTEM_SHORT) == 0) ||
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(strcmp(str, U_SYSTEM_FULL) == 0))
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return (ZFS_SYSTEM);
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else if ((strcmp(str, U_REPARSE_SHORT) == 0) ||
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(strcmp(str, U_REPARSE_FULL) == 0))
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return (ZFS_REPARSE);
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return (-1);
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}
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int
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main(int argc, const char * const argv[])
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{
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if (argc != 3)
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errx(EXIT_FAILURE, "Usage: %s flag filepath", argv[0]);
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uint8_t unset, unset_all;
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uint64_t attribute, dosflags;
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char *flag = strdup(argv[1]);
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unset = unset_all = 0;
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attribute = dosflags = 0;
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// convert the flag to lower case
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for (int i = 0; i < strlen(argv[1]); ++i)
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flag[i] = tolower((unsigned char) flag[i]);
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// check if flag starts with 'no'
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if (IS_NO(flag)) {
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if (strcmp(flag, SU_NODUMP) == 0) {
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attribute = ZFS_NODUMP;
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} else {
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attribute = str_to_attribute(flag + 2);
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unset = 1;
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}
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}
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// check if '0' was passed
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else if (strcmp(flag, "0") == 0) {
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unset_all = 1;
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}
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// check if the flag is 'dump'
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else if (strcmp(flag, UNSET_NODUMP) == 0) {
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attribute = ZFS_NODUMP;
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unset = 1;
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} else {
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attribute = str_to_attribute(flag);
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}
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if (attribute == -1)
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errx(EXIT_FAILURE, "Invalid Flag %s", argv[1]);
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int fd = open(argv[2], O_RDWR | O_APPEND);
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if (fd < 0)
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err(EXIT_FAILURE, "Failed to open %s", argv[2]);
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if (ioctl(fd, ZFS_IOC_GETDOSFLAGS, &dosflags) == -1)
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err(EXIT_FAILURE, "ZFS_IOC_GETDOSFLAGS failed");
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if (unset == 0 && attribute != 0)
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attribute |= dosflags;
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else if (unset == 1 && attribute != 0)
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attribute = dosflags & (~attribute);
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else if (unset_all == 1)
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attribute = 0;
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// set the attribute/s
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if (ioctl(fd, ZFS_IOC_SETDOSFLAGS, &attribute) == -1)
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err(EXIT_FAILURE, "ZFS_IOC_SETDOSFLAGS failed");
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// get the attributes to confirm
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dosflags = -1;
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if (ioctl(fd, ZFS_IOC_GETDOSFLAGS, &dosflags) == -1)
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err(EXIT_FAILURE, "ZFS_IOC_GETDOSFLAGS failed");
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(void) close(fd);
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if (dosflags != attribute)
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errx(EXIT_FAILURE, "Could not set %s attribute", argv[1]);
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(void) printf("New Dos Flags: 0x%llx\n", (u_longlong_t)dosflags);
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return (EXIT_SUCCESS);
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}
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