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Add a tool for creating small image files. Data is written out in a reproducible order, sequentially from the start of the device. Metadata is initially written to a temporary device, then after writing out data, the metadata we want to keep (alloc info is left out by default) is migrated to the real device. Then, the image file is trimmed to minimum size and the temporary metadata device dropped. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
123 lines
4.7 KiB
C
123 lines
4.7 KiB
C
/*
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* Authors: Kent Overstreet <kent.overstreet@gmail.com>
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* Gabriel de Perthuis <g2p.code@gmail.com>
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* Jacob Malevich <jam@datera.io>
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*
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* GPLv2
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <raid/raid.h>
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#include "cmds.h"
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void bcachefs_usage(void)
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{
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puts("bcachefs - tool for managing bcachefs filesystems\n"
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"usage: bcachefs <command> [<args>]\n"
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"\n"
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"Superblock commands:\n"
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" format Format a new filesystem\n"
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" show-super Dump superblock information to stdout\n"
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" recover-super Attempt to recover overwritten superblock from backups\n"
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" set-fs-option Set a filesystem option\n"
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" reset-counters Reset all counters on an unmounted device\n"
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" strip-alloc Strip alloc info on a filesystem to be used read-only\n"
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"\n"
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"Commands for managing images:\n"
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" image create Create a new compact disk image\n"
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"Mount:\n"
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" mount Mount a filesystem\n"
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"\n"
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"Repair:\n"
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" fsck Check an existing filesystem for errors\n"
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"\n"
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#if 0
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"Startup/shutdown, assembly of multi device filesystems:\n"
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" assemble Assemble an existing multi device filesystem\n"
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" incremental Incrementally assemble an existing multi device filesystem\n"
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" run Start a partially assembled filesystem\n"
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" stop Stop a running filesystem\n"
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"\n"
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#endif
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"Commands for managing a running filesystem:\n"
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" fs usage Show disk usage\n"
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" fs top Show runtime performance information\n"
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"\n"
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"Commands for managing devices within a running filesystem:\n"
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" device add Add a new device to an existing filesystem\n"
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" device remove Remove a device from an existing filesystem\n"
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" device online Re-add an existing member to a filesystem\n"
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" device offline Take a device offline, without removing it\n"
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" device evacuate Migrate data off of a specific device\n"
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" device set-state Mark a device as failed\n"
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" device resize Resize filesystem on a device\n"
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" device resize-journal Resize journal on a device\n"
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"\n"
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"Commands for managing subvolumes and snapshots:\n"
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" subvolume create Create a new subvolume\n"
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" subvolume delete Delete an existing subvolume\n"
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" subvolume snapshot Create a snapshot\n"
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"\n"
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"Commands for managing filesystem data:\n"
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" data rereplicate Rereplicate degraded data\n"
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" data scrub Verify checksums and correct errors, if possible\n"
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" data job Kick off low level data jobs\n"
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"\n"
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"Encryption:\n"
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" unlock Unlock an encrypted filesystem prior to running/mounting\n"
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" set-passphrase Change passphrase on an existing (unmounted) filesystem\n"
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" remove-passphrase Remove passphrase on an existing (unmounted) filesystem\n"
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"\n"
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"Migrate:\n"
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" migrate Migrate an existing filesystem to bcachefs, in place\n"
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" migrate-superblock Add default superblock, after bcachefs migrate\n"
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"\n"
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"Commands for operating on files in a bcachefs filesystem:\n"
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" set-file-option Set various attributes on files or directories\n"
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"\n"
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"Debug:\n"
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"These commands work on offline, unmounted filesystems\n"
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" dump Dump filesystem metadata to a qcow2 image\n"
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" list List filesystem metadata in textual form\n"
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" list_journal List contents of journal\n"
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"\n"
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#ifdef BCACHEFS_FUSE
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"FUSE:\n"
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" fusemount Mount a filesystem via FUSE\n"
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"\n"
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#endif
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"Miscellaneous:\n"
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" completions Generate shell completions\n"
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" version Display the version of the invoked bcachefs tool\n");
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}
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int fs_cmds(int argc, char *argv[])
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{
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char *cmd = pop_cmd(&argc, argv);
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if (argc < 1)
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return fs_usage();
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if (!strcmp(cmd, "usage"))
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return cmd_fs_usage(argc, argv);
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if (!strcmp(cmd, "top"))
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return cmd_fs_top(argc, argv);
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fs_usage();
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return -EINVAL;
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}
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