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As new compression algorithms are added to ZFS, it could be useful for people to recompress data with new algorithms. There is currently no mechanism to do this aside from copying the data manually into a new filesystem with the new algorithm enabled. This tool allows the transformation to happen through zfs send, allowing it to be done efficiently to remote systems and in an incremental fashion. A new zstream command is added that decompresses WRITE records and then recompresses them with a provided algorithm, and then re-emits the modified send stream. It may also be possible to re-compress embedded block pointers, but that was not attempted for the initial version. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Signed-off-by: Paul Dagnelie <pcd@delphix.com> Closes #14106
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/*
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* CDDL HEADER START
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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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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2020 by Delphix. All rights reserved.
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* Copyright (c) 2020 by Datto Inc. All rights reserved.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <libintl.h>
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#include <stddef.h>
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#include <libzfs.h>
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#include "zstream.h"
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void
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zstream_usage(void)
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{
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(void) fprintf(stderr,
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"usage: zstream command args ...\n"
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"Available commands are:\n"
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"\n"
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"\tzstream dump [-vCd] FILE\n"
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"\t... | zstream dump [-vCd]\n"
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"\n"
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"\tzstream decompress [-v] [OBJECT,OFFSET[,TYPE]] ...\n"
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"\n"
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"\tzstream recompress [ -l level] TYPE\n"
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"\n"
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"\tzstream token resume_token\n"
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"\n"
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"\tzstream redup [-v] FILE | ...\n");
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exit(1);
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}
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int
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main(int argc, char *argv[])
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{
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char *basename = strrchr(argv[0], '/');
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basename = basename ? (basename + 1) : argv[0];
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if (argc >= 1 && strcmp(basename, "zstreamdump") == 0)
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return (zstream_do_dump(argc, argv));
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if (argc < 2)
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zstream_usage();
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char *subcommand = argv[1];
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if (strcmp(subcommand, "dump") == 0) {
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return (zstream_do_dump(argc - 1, argv + 1));
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} else if (strcmp(subcommand, "decompress") == 0) {
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return (zstream_do_decompress(argc - 1, argv + 1));
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} else if (strcmp(subcommand, "recompress") == 0) {
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return (zstream_do_recompress(argc - 1, argv + 1));
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} else if (strcmp(subcommand, "token") == 0) {
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return (zstream_do_token(argc - 1, argv + 1));
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} else if (strcmp(subcommand, "redup") == 0) {
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return (zstream_do_redup(argc - 1, argv + 1));
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} else {
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zstream_usage();
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}
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}
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