Add new defrag range ioctl that can also compress files on demand.
This commit is contained in:
Chris Mason
parent
7b14bc0f4f
commit
06cbf62fda
5
Makefile
5
Makefile
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@ -17,7 +17,7 @@ bindir = $(prefix)/bin
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LIBS=-luuid
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progs = btrfsctl mkfs.btrfs btrfs-debug-tree btrfs-show btrfs-vol btrfsck \
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btrfs-map-logical btrfs-list
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btrfs-map-logical btrfs-list btrfs-defrag
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# make C=1 to enable sparse
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ifdef C
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@ -39,6 +39,9 @@ version:
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btrfs-list: $(objects) btrfs-list.o
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gcc $(CFLAGS) -o btrfs-list btrfs-list.o $(objects) $(LDFLAGS) $(LIBS)
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btrfs-defrag: $(objects) btrfs-defrag.o
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gcc $(CFLAGS) -o btrfs-defrag btrfs-defrag.o $(objects) $(LDFLAGS) $(LIBS)
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btrfsctl: $(objects) btrfsctl.o
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gcc $(CFLAGS) -o btrfsctl btrfsctl.o $(objects) $(LDFLAGS) $(LIBS)
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151
btrfs-defrag.c
Normal file
151
btrfs-defrag.c
Normal file
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@ -0,0 +1,151 @@
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/*
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* Copyright (C) 2010 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __CHECKER__
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include "ioctl.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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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 <unistd.h>
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#include <dirent.h>
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#include <libgen.h>
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#include <getopt.h>
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#include "kerncompat.h"
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#include "ctree.h"
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#include "transaction.h"
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#include "utils.h"
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#include "version.h"
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static u64 parse_size(char *s)
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{
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int len = strlen(s);
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char c;
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u64 mult = 1;
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if (!isdigit(s[len - 1])) {
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c = tolower(s[len - 1]);
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switch (c) {
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case 'g':
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mult *= 1024;
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case 'm':
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mult *= 1024;
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case 'k':
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mult *= 1024;
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case 'b':
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break;
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default:
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fprintf(stderr, "Unknown size descriptor %c\n", c);
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exit(1);
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}
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s[len - 1] = '\0';
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}
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return atoll(s) * mult;
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}
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static void print_usage(void)
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{
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printf("usage: btrfs-defrag [-c] [-f] [-s start] [-l len] "
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"[-t threshold] file ...\n");
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exit(1);
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}
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int main(int ac, char **av)
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{
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int fd;
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int compress = 0;
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int flush = 0;
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u64 start = 0;
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u64 len = (u64)-1;
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u32 thresh = 0;
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int i;
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int errors = 0;
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int ret = 0;
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int verbose = 0;
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struct btrfs_ioctl_defrag_range_args range;
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while(1) {
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int c = getopt(ac, av, "vcfs:l:t:");
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if (c < 0)
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break;
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switch(c) {
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case 'c':
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compress = 1;
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break;
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case 'f':
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flush = 1;
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break;
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case 'v':
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verbose = 1;
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break;
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case 's':
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start = parse_size(optarg);
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break;
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case 'l':
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len = parse_size(optarg);
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break;
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case 't':
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thresh = parse_size(optarg);
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break;
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default:
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print_usage();
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return 1;
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}
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}
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if (ac - optind == 0)
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print_usage();
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memset(&range, 0, sizeof(range));
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range.start = start;
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range.len = len;
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range.extent_thresh = thresh;
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if (compress)
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range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
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if (flush)
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range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
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for (i = optind; i < ac; i++) {
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fd = open(av[i], O_RDWR);
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if (fd < 0) {
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fprintf(stderr, "failed to open %s\n", av[i]);
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perror("open:");
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errors++;
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continue;
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}
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ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, &range);
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if (ret) {
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fprintf(stderr, "ioctl failed on %s ret %d\n",
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av[i], ret);
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errors++;
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}
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close(fd);
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}
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if (verbose)
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printf("%s\n", BTRFS_BUILD_VERSION);
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if (errors) {
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fprintf(stderr, "total %d failures\n", errors);
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exit(1);
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}
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return 0;
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}
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32
ioctl.h
32
ioctl.h
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@ -92,6 +92,34 @@ struct btrfs_ioctl_ino_lookup_args {
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char name[BTRFS_INO_LOOKUP_PATH_MAX];
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};
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/* flags for the defrag range ioctl */
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#define BTRFS_DEFRAG_RANGE_COMPRESS 1
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#define BTRFS_DEFRAG_RANGE_START_IO 2
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struct btrfs_ioctl_defrag_range_args {
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/* start of the defrag operation */
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__u64 start;
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/* number of bytes to defrag, use (u64)-1 to say all */
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__u64 len;
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/*
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* flags for the operation, which can include turning
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* on compression for this one defrag
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*/
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__u64 flags;
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/*
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* any extent bigger than this will be considered
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* already defragged. Use 0 to take the kernel default
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* Use 1 to say every single extent must be rewritten
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*/
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__u32 extent_thresh;
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/* spare for later */
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__u32 unused[5];
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};
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#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
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@ -118,10 +146,10 @@ struct btrfs_ioctl_ino_lookup_args {
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/* 13 is for CLONE_RANGE */
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#define BTRFS_IOC_SUBVOL_CREATE _IOW(BTRFS_IOCTL_MAGIC, 14, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_SNAP_DESTROY _IOW(BTRFS_IOCTL_MAGIC, 15, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_DEFRAG_RANGE _IOW(BTRFS_IOCTL_MAGIC, 16, \
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struct btrfs_ioctl_defrag_range_args)
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#define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
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struct btrfs_ioctl_search_args)
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#define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
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