The kernel EFS code has been unmaintained for over twenty years. It was superseded on IRIX around thirty years ago. I haven't seen an EFS filesystem in the wild since 1999. Userspace tools to read EFS filesystems exist, such as https://github.com/jkbenaim/efsextract There's no benefit to keeping this filesystem in the kernel, and it only increases the maintenance burden for tree-wide changes.
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| 1 | −/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ | |
| 2 | −/* | |
| 3 | − * efs_fs_sb.h | |
| 4 | − * | |
| 5 | − * Copyright (c) 1999 Al Smith | |
| 6 | − * | |
| 7 | − * Portions derived from IRIX header files (c) 1988 Silicon Graphics | |
| 8 | − */ | |
| 9 | − | |
| 10 | −#ifndef __EFS_FS_SB_H__ | |
| 11 | −#define __EFS_FS_SB_H__ | |
| 12 | − | |
| 13 | −#include <linux/types.h> | |
| 14 | −#include <linux/magic.h> | |
| 15 | − | |
| 16 | −/* EFS superblock magic numbers */ | |
| 17 | −#define EFS_MAGIC 0x072959 | |
| 18 | −#define EFS_NEWMAGIC 0x07295a | |
| 19 | − | |
| 20 | −#define IS_EFS_MAGIC(x) ((x == EFS_MAGIC) || (x == EFS_NEWMAGIC)) | |
| 21 | − | |
| 22 | −#define EFS_SUPER 1 | |
| 23 | −#define EFS_ROOTINODE 2 | |
| 24 | − | |
| 25 | −/* efs superblock on disk */ | |
| 26 | −struct efs_super { | |
| 27 | − __be32 fs_size; /* size of filesystem, in sectors */ | |
| 28 | − __be32 fs_firstcg; /* bb offset to first cg */ | |
| 29 | − __be32 fs_cgfsize; /* size of cylinder group in bb's */ | |
| 30 | − __be16 fs_cgisize; /* bb's of inodes per cylinder group */ | |
| 31 | − __be16 fs_sectors; /* sectors per track */ | |
| 32 | − __be16 fs_heads; /* heads per cylinder */ | |
| 33 | − __be16 fs_ncg; /* # of cylinder groups in filesystem */ | |
| 34 | − __be16 fs_dirty; /* fs needs to be fsck'd */ | |
| 35 | − __be32 fs_time; /* last super-block update */ | |
| 36 | − __be32 fs_magic; /* magic number */ | |
| 37 | − char fs_fname[6]; /* file system name */ | |
| 38 | − char fs_fpack[6]; /* file system pack name */ | |
| 39 | − __be32 fs_bmsize; /* size of bitmap in bytes */ | |
| 40 | − __be32 fs_tfree; /* total free data blocks */ | |
| 41 | − __be32 fs_tinode; /* total free inodes */ | |
| 42 | − __be32 fs_bmblock; /* bitmap location. */ | |
| 43 | − __be32 fs_replsb; /* Location of replicated superblock. */ | |
| 44 | − __be32 fs_lastialloc; /* last allocated inode */ | |
| 45 | − char fs_spare[20]; /* space for expansion - MUST BE ZERO */ | |
| 46 | − __be32 fs_checksum; /* checksum of volume portion of fs */ | |
| 47 | −}; | |
| 48 | − | |
| 49 | −/* efs superblock information in memory */ | |
| 50 | −struct efs_sb_info { | |
| 51 | − __u32 fs_magic; /* superblock magic number */ | |
| 52 | − __u32 fs_start; /* first block of filesystem */ | |
| 53 | − __u32 first_block; /* first data block in filesystem */ | |
| 54 | − __u32 total_blocks; /* total number of blocks in filesystem */ | |
| 55 | − __u32 group_size; /* # of blocks a group consists of */ | |
| 56 | − __u32 data_free; /* # of free data blocks */ | |
| 57 | − __u32 inode_free; /* # of free inodes */ | |
| 58 | − __u16 inode_blocks; /* # of blocks used for inodes in every grp */ | |
| 59 | − __u16 total_groups; /* # of groups */ | |
| 60 | −}; | |
| 61 | − | |
| 62 | −#endif /* __EFS_FS_SB_H__ */ | |
| 63 | − | |