fs/ext4/fsmap.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 Oracle.  All Rights Reserved.
   4  *
   5  * Author: Darrick J. Wong <darrick.wong@oracle.com>
   6  */
   7 #ifndef __EXT4_FSMAP_H__
   8 #define __EXT4_FSMAP_H__
   9
  10 struct fsmap;
  11
  12 /* internal fsmap representation */
  13 struct ext4_fsmap {
  14         struct list_head        fmr_list;
  15         dev_t           fmr_device;     /* device id */
  16         uint32_t        fmr_flags;      /* mapping flags */
  17         uint64_t        fmr_physical;   /* device offset of segment */
  18         uint64_t        fmr_owner;      /* owner id */
  19         uint64_t        fmr_length;     /* length of segment, blocks */
  20 };
  21
  22 struct ext4_fsmap_head {
  23         uint32_t        fmh_iflags;     /* control flags */
  24         uint32_t        fmh_oflags;     /* output flags */
  25         unsigned int    fmh_count;      /* # of entries in array incl. input */
  26         unsigned int    fmh_entries;    /* # of entries filled in (output). */
  27
  28         struct ext4_fsmap fmh_keys[2];  /* low and high keys */
  29 };
  30
  31 void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest,
  32                 struct ext4_fsmap *src);
  33 void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest,
  34                 struct fsmap *src);
  35
  36 /* fsmap to userspace formatter - copy to user & advance pointer */
  37 typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *);
  38
  39 int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head,
  40                 ext4_fsmap_format_t formatter, void *arg);
  41
  42 #define EXT4_QUERY_RANGE_ABORT          1
  43 #define EXT4_QUERY_RANGE_CONTINUE       0
  44
  45 /*      fmr_owner special values for FS_IOC_GETFSMAP; some share w/ XFS */
  46 #define EXT4_FMR_OWN_FREE       FMR_OWN_FREE      /* free space */
  47 #define EXT4_FMR_OWN_UNKNOWN    FMR_OWN_UNKNOWN   /* unknown owner */
  48 #define EXT4_FMR_OWN_FS         FMR_OWNER('X', 1) /* static fs metadata */
  49 #define EXT4_FMR_OWN_LOG        FMR_OWNER('X', 2) /* journalling log */
  50 #define EXT4_FMR_OWN_INODES     FMR_OWNER('X', 5) /* inodes */
  51 #define EXT4_FMR_OWN_GDT        FMR_OWNER('f', 1) /* group descriptors */
  52 #define EXT4_FMR_OWN_RESV_GDT   FMR_OWNER('f', 2) /* reserved gdt blocks */
  53 #define EXT4_FMR_OWN_BLKBM      FMR_OWNER('f', 3) /* block bitmap */
  54 #define EXT4_FMR_OWN_INOBM      FMR_OWNER('f', 4) /* inode bitmap */
  55
  56 #endif /* __EXT4_FSMAP_H__ */