mirror of
https://github.com/versity/scoutfs.git
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Zach Brown
b9bd7d1293
The first commit of the scoutfs-tests suite which uses multiple mounts on one host to test multi-node scoutfs. Signed-off-by: Zach Brown <zab@versity.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* Given a scoutfs mountpoint and an inode number, open the inode by
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* handle and print the contents to stdout.
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*
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* Copyright (C) 2018 Versity Software, Inc. 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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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <unistd.h>
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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 <inttypes.h>
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#include <errno.h>
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#include <endian.h>
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#include <linux/types.h>
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#define FILEID_SCOUTFS 0x81
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#define FILEID_SCOUTFS_WITH_PARENT 0x82
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struct our_handle {
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struct file_handle handle;
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/*
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* scoutfs file handle can be ino or ino/parent. The
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* handle_type field of struct file_handle denotes which
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* version is in use. We only use the ino variant here.
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*/
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__le64 scoutfs_ino;
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};
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#define SZ 4096
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char buf[SZ];
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int main(int argc, char **argv)
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{
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int fd, mntfd, bytes;
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char *mnt;
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uint64_t ino;
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struct our_handle handle;
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if (argc < 3) {
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printf("%s <mountpoint> <inode #>\n", argv[0]);
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return 1;
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}
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mnt = argv[1];
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ino = strtoull(argv[2], NULL, 10);
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mntfd = open(mnt, O_RDONLY);
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if (mntfd == -1) {
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perror("while opening mountpoint");
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return 1;
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}
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handle.handle.handle_bytes = sizeof(struct our_handle);
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handle.handle.handle_type = FILEID_SCOUTFS;
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handle.scoutfs_ino = htole64(ino);
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fd = open_by_handle_at(mntfd, &handle.handle, O_RDONLY);
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if (fd == -1) {
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perror("while opening inode by handle");
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return 1;
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}
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while ((bytes = read(fd, buf, SZ)) > 0)
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write(STDOUT_FILENO, buf, bytes);
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close(fd);
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close(mntfd);
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return 0;
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}
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