1 /* 2 * Copyright (C) 2017 Oracle. All Rights Reserved. 3 * 4 * Author: Darrick J. Wong <darrick.wong@oracle.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 2 9 * of the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it would be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. 19 */ 20 #ifndef __EXT4_FSMAP_H__ 21 #define __EXT4_FSMAP_H__ 22 23 struct fsmap; 24 25 /* internal fsmap representation */ 26 struct ext4_fsmap { 27 struct list_head fmr_list; 28 dev_t fmr_device; /* device id */ 29 uint32_t fmr_flags; /* mapping flags */ 30 uint64_t fmr_physical; /* device offset of segment */ 31 uint64_t fmr_owner; /* owner id */ 32 uint64_t fmr_length; /* length of segment, blocks */ 33 }; 34 35 struct ext4_fsmap_head { 36 uint32_t fmh_iflags; /* control flags */ 37 uint32_t fmh_oflags; /* output flags */ 38 unsigned int fmh_count; /* # of entries in array incl. input */ 39 unsigned int fmh_entries; /* # of entries filled in (output). */ 40 41 struct ext4_fsmap fmh_keys[2]; /* low and high keys */ 42 }; 43 44 void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest, 45 struct ext4_fsmap *src); 46 void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest, 47 struct fsmap *src); 48 49 /* fsmap to userspace formatter - copy to user & advance pointer */ 50 typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *); 51 52 int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head, 53 ext4_fsmap_format_t formatter, void *arg); 54 55 #define EXT4_QUERY_RANGE_ABORT 1 56 #define EXT4_QUERY_RANGE_CONTINUE 0 57 58 /* fmr_owner special values for FS_IOC_GETFSMAP; some share w/ XFS */ 59 #define EXT4_FMR_OWN_FREE FMR_OWN_FREE /* free space */ 60 #define EXT4_FMR_OWN_UNKNOWN FMR_OWN_UNKNOWN /* unknown owner */ 61 #define EXT4_FMR_OWN_FS FMR_OWNER('X', 1) /* static fs metadata */ 62 #define EXT4_FMR_OWN_LOG FMR_OWNER('X', 2) /* journalling log */ 63 #define EXT4_FMR_OWN_INODES FMR_OWNER('X', 5) /* inodes */ 64 #define EXT4_FMR_OWN_GDT FMR_OWNER('f', 1) /* group descriptors */ 65 #define EXT4_FMR_OWN_RESV_GDT FMR_OWNER('f', 2) /* reserved gdt blocks */ 66 #define EXT4_FMR_OWN_BLKBM FMR_OWNER('f', 3) /* inode bitmap */ 67 #define EXT4_FMR_OWN_INOBM FMR_OWNER('f', 4) /* block bitmap */ 68 69 #endif /* __EXT4_FSMAP_H__ */ 70