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 It was superseded on IRIX around thirty years ago.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 | |||