+++ /dev/null
-(* 'df' command for virtual domains.
- (C) Copyright 2007 Richard W.M. Jones, Red Hat Inc.
- http://libvirt.org/
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- 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., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- Support for EXT2/EXT3 filesystems.
-*)
-
-open Unix
-open Printf
-
-open Virt_df_gettext.Gettext
-open Virt_df
-
-let superblock_offset = 1024L
-
-let probe_ext2 dev =
- (* Load the superblock. *)
- let bits = dev#read_bitstring superblock_offset 1024 in
-
- (* The structure is straight from /usr/include/linux/ext3_fs.h *)
- bitmatch bits with
- | s_inodes_count : 32 : littleendian; (* Inodes count *)
- s_blocks_count : 32 : littleendian; (* Blocks count *)
- s_r_blocks_count : 32 : littleendian; (* Reserved blocks count *)
- s_free_blocks_count : 32 : littleendian; (* Free blocks count *)
- s_free_inodes_count : 32 : littleendian; (* Free inodes count *)
- s_first_data_block : 32 : littleendian; (* First Data Block *)
- s_log_block_size : 32 : littleendian; (* Block size *)
- s_log_frag_size : 32 : littleendian; (* Fragment size *)
- s_blocks_per_group : 32 : littleendian; (* # Blocks per group *)
- s_frags_per_group : 32 : littleendian; (* # Fragments per group *)
- s_inodes_per_group : 32 : littleendian; (* # Inodes per group *)
- s_mtime : 32 : littleendian; (* Mount time *)
- s_wtime : 32 : littleendian; (* Write time *)
- s_mnt_count : 16 : littleendian; (* Mount count *)
- s_max_mnt_count : 16 : littleendian; (* Maximal mount count *)
- 0xef53 : 16 : littleendian; (* Magic signature *)
- s_state : 16 : littleendian; (* File system state *)
- s_errors : 16 : littleendian; (* Behaviour when detecting errors *)
- s_minor_rev_level : 16 : littleendian; (* minor revision level *)
- s_lastcheck : 32 : littleendian; (* time of last check *)
- s_checkinterval : 32 : littleendian; (* max. time between checks *)
- s_creator_os : 32 : littleendian; (* OS *)
- s_rev_level : 32 : littleendian; (* Revision level *)
- s_def_resuid : 16 : littleendian; (* Default uid for reserved blocks *)
- s_def_resgid : 16 : littleendian; (* Default gid for reserved blocks *)
- s_first_ino : 32 : littleendian; (* First non-reserved inode *)
- s_inode_size : 16 : littleendian; (* size of inode structure *)
- s_block_group_nr : 16 : littleendian; (* block group # of this superblock *)
- s_feature_compat : 32 : littleendian; (* compatible feature set *)
- s_feature_incompat : 32 : littleendian; (* incompatible feature set *)
- s_feature_ro_compat : 32 : littleendian; (* readonly-compatible feature set *)
- s_uuid : 128 : bitstring; (* 128-bit uuid for volume *)
- s_volume_name : 128 : bitstring; (* volume name XXX string *)
- s_last_mounted : 512 : bitstring; (* directory where last mounted XXX string *)
- s_algorithm_usage_bitmap : 32 : littleendian; (* For compression *)
- s_prealloc_blocks : 8; (* Nr of blocks to try to preallocate*)
- s_prealloc_dir_blocks : 8; (* Nr to preallocate for dirs *)
- s_reserved_gdt_blocks : 16 : littleendian; (* Per group desc for online growth *)
- s_journal_uuid : 128 : bitstring; (* uuid of journal superblock *)
- s_journal_inum : 32 : littleendian; (* inode number of journal file *)
- s_journal_dev : 32 : littleendian; (* device number of journal file *)
- s_last_orphan : 32 : littleendian; (* start of list of inodes to delete *)
- s_hash_seed0 : 32 : littleendian; (* HTREE hash seed *)
- s_hash_seed1 : 32 : littleendian;
- s_hash_seed2 : 32 : littleendian;
- s_hash_seed3 : 32 : littleendian;
- s_def_hash_version : 8; (* Default hash version to use *)
- s_reserved_char_pad : 8;
- s_reserved_word_pad : 16 : littleendian;
- s_default_mount_opts : 32 : littleendian;
- s_first_meta_bg : 32 : littleendian; (* First metablock block group *)
- s_reserved : 6080 : bitstring -> (* Padding to the end of the block *)
-
- (* Work out the block size in bytes. *)
- let s_log_block_size = Int32.to_int s_log_block_size in
- let block_size = 1024L in
- let block_size = Int64.shift_left block_size s_log_block_size in
-
- (* Number of groups. *)
- let s_groups_count =
- Int64.of_int32 (
- (s_blocks_count -* s_first_data_block -* 1l)
- /* s_blocks_per_group +* 1l
- ) in
-
-(*
- (* Number of group descriptors per block. *)
- let s_inodes_per_block = s_blocksize /
- let s_desc_per_block = block_size / s_inodes_per_block in
- let db_count =
- (s_groups_count +^ s_desc_per_block -^ 1L)
- /^ s_desc_per_block
-*)
-
- (* Calculate the block overhead (used by superblocks, inodes, etc.)
- * See fs/ext2/super.c.
- *)
- let overhead = Int64.of_int32 s_first_data_block in
- let overhead = (* XXX *) overhead in
-
- {
- fs_name = s_ "Linux ext2/3";
- fs_block_size = block_size;
- fs_blocks_total = Int64.of_int32 s_blocks_count -^ overhead;
- fs_is_swap = false;
- fs_blocks_reserved = Int64.of_int32 s_r_blocks_count;
- fs_blocks_avail = Int64.of_int32 s_free_blocks_count;
- fs_blocks_used =
- Int64.of_int32 s_blocks_count -^ overhead
- -^ Int64.of_int32 s_free_blocks_count;
- fs_inodes_total = Int64.of_int32 s_inodes_count;
- fs_inodes_reserved = 0L; (* XXX? *)
- fs_inodes_avail = Int64.of_int32 s_free_inodes_count;
- fs_inodes_used = Int64.of_int32 s_inodes_count
- (*-^ 0L*)
- -^ Int64.of_int32 s_free_inodes_count;
- }
-
- | _ ->
- raise Not_found (* Not an EXT2/3 superblock. *)
-
-(* Register with main code. *)
-let () = filesystem_type_register "ext2" probe_ext2
git.annexia.org / virt-top.git / blobdiff