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btrfs-progs/qgroup-verify.h

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btrfs-progs: add quota group verify code This patch adds functionality (in qgroup-verify.c) to compute bytecounts in subvolume quota groups. The original groups are read in and stored in memory so that after we compute our own bytecounts, we can compare them with those on disk. A print function is provided to do this comparison and show the results on the console. A 'qgroup check' pass is added to btrfsck. If any subvolume quota groups differ from what we compute, the differences for them are printed. We also provide an option '--qgroup-report' which will run only the quota check code and print a report on all quota groups. Other than making it possible to verify that our qgroup changes work correctly, this mode can also be used in xfstests for automated checking after qgroup tests. This patch does not address the following: - compressed counts are identical to non compressed, because kernel doesn't make the distinction yet. Adding the code to verify compressed counts shouldn't be hard at all though once kernel can do this. - It is only concerned with subvolume quota groups (like most of btrfs-progs). Signed-off-by: Mark Fasheh <mfasheh@suse.de> Signed-off-by: David Sterba <dsterba@suse.cz>
2014-05-07 20:07:17 +00:00
/*
* Copyright (C) 2014 SUSE. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#ifndef _BTRFS_QGROUP_VERIFY_H
#define _BTRFS_QGROUP_VERIFY_H
int qgroup_verify_all(struct btrfs_fs_info *info);
void print_qgroup_report(int all);
btrfs-progs: show extent state for a subvolume The qgroup verification code can trivially be extended to provide extended information on the extents which a subvolume root references. Along with qgroup-verify, I have found this tool to be invaluable when tracking down extent references. The patch adds a switch to the check subcommand '--subvol-extents' which takes as args a single subvolume id. When run with the switch, we'll print out each extent that the subvolume references. The extent printout gives standard extent info you would expect along with information on which other roots reference it. Sample output follows - this is a few lines from a run on a subvolume I've been testing qgroup changes on: Print extent state for subvolume 281 on /dev/vdb2 UUID: 8203ca66-9858-4e3f-b447-5bbaacf79c02 Offset Len Root Refs Roots 12582912 20480 12 257 279 280 281 282 283 284 285 286 287 288 289 12603392 8192 12 257 279 280 281 282 283 284 285 286 287 288 289 12611584 12288 12 257 279 280 281 282 283 284 285 286 287 288 289 <snip a bunch of extents to show some variety> 124583936 16384 4 281 282 283 280 125075456 16384 4 280 281 282 283 126255104 16384 11 257 280 281 282 283 284 285 286 287 288 289 4763508736 4096 3 279 280 281 In case it wasn't clear, this applies on top of my qgroup verify patch: "btrfs-progs: add quota group verify code" A branch with all this can be found on github: https://github.com/markfasheh/btrfs-progs-patches/tree/qgroup-verify Please apply, Signed-off-by: Mark Fasheh <mfasheh@suse.de> Signed-off-by: David Sterba <dsterba@suse.cz>
2014-07-02 20:34:41 +00:00
int print_extent_state(struct btrfs_fs_info *info, u64 subvol);
btrfs-progs: add quota group verify code This patch adds functionality (in qgroup-verify.c) to compute bytecounts in subvolume quota groups. The original groups are read in and stored in memory so that after we compute our own bytecounts, we can compare them with those on disk. A print function is provided to do this comparison and show the results on the console. A 'qgroup check' pass is added to btrfsck. If any subvolume quota groups differ from what we compute, the differences for them are printed. We also provide an option '--qgroup-report' which will run only the quota check code and print a report on all quota groups. Other than making it possible to verify that our qgroup changes work correctly, this mode can also be used in xfstests for automated checking after qgroup tests. This patch does not address the following: - compressed counts are identical to non compressed, because kernel doesn't make the distinction yet. Adding the code to verify compressed counts shouldn't be hard at all though once kernel can do this. - It is only concerned with subvolume quota groups (like most of btrfs-progs). Signed-off-by: Mark Fasheh <mfasheh@suse.de> Signed-off-by: David Sterba <dsterba@suse.cz>
2014-05-07 20:07:17 +00:00
#endif /* _BTRFS_QGROUP_VERIFY_H */