2017-10-19 05:41:37 +00:00
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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.
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*/
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/*
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* Defines and functions declarations for mkfs --rootdir
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*/
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#ifndef __BTRFS_MKFS_ROOTDIR_H__
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#define __BTRFS_MKFS_ROOTDIR_H__
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#include "kernel-lib/list.h"
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struct directory_name_entry {
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const char *dir_name;
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const char *path;
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ino_t inum;
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struct list_head list;
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};
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int btrfs_mkfs_fill_dir(const char *source_dir, struct btrfs_root *root,
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bool verbose);
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btrfs-progs: mkfs/rootdir: Use over-reserve method to make size estimate easier
Use an easier method to calculate the estimate device size for
mkfs.btrfs --rootdir.
The new method will over-estimate, but should ensure we won't encounter
ENOSPC.
It relies on the following data:
1) number of inodes -- for metadata chunk size
2) rounded up data size of each regular inode -- for data chunk size
Total meta chunk size = round_up(nr_inode * (PATH_MAX * 3 + sectorsize),
min_chunk_size) * profile_multiplier
PATH_MAX is the maximum size possible for INODE_REF/DIR_INDEX/DIR_ITEM.
Sectorsize is the maximum size possible for inline extent.
min_chunk_size is 8M for SINGLE, and 32M for DUP, get from
btrfs_alloc_chunk().
profile_multiplier is 1 for Single, 2 for DUP.
Total data chunk size is much easier.
Total data chunk size = round_up(total_data_usage, min_chunk_size) *
profile_multiplier
Total_data_usage is the sum of *rounded up* size of each regular inode
use.
min_chunk_size is 8M for SINGLE, 64M for DUP, get from btrfS_alloc_chunk().
Same profile_multiplier for meta.
This over-estimate calculate is, of course inacurrate, but since we will
later shrink the fs to its real usage, it doesn't matter much now.
Signed-off-by: Qu Wenruo <wqu@suse.com>
[ update comments ]
Signed-off-by: David Sterba <dsterba@suse.com>
2017-10-19 02:11:07 +00:00
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u64 btrfs_mkfs_size_dir(const char *dir_name, u32 sectorsize, u64 min_dev_size,
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u64 meta_profile, u64 data_profile);
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2017-10-19 09:13:55 +00:00
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int btrfs_mkfs_shrink_fs(struct btrfs_fs_info *fs_info, u64 *new_size_ret,
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bool shrink_file_size);
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2017-10-19 05:41:37 +00:00
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#endif
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