efs: Remove EFS

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It was superseded on IRIX around thirty years ago.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.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://patch.msgid.link/20260618211822.3599089-1-willy@infradead.org
Acked-by: Jori Koolstra <jkoolstra@xs4all.nl>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

1 files changed, 0 insertions, 63 deletions

diff --git a/include/uapi/linux/efs_fs_sb.h b/include/uapi/linux/efs_fs_sb.h
deleted file mode 100644
index 6bad29a10faa..000000000000
--- a/include/uapi/linux/efs_fs_sb.h
+++ /dev/null
@@ -1,63 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-/*
- * efs_fs_sb.h
- *
- * Copyright (c) 1999 Al Smith
- *
- * Portions derived from IRIX header files (c) 1988 Silicon Graphics
- */
-
-#ifndef __EFS_FS_SB_H__
-#define __EFS_FS_SB_H__
-
-#include <linux/types.h>
-#include <linux/magic.h>
-
-/* EFS superblock magic numbers */
-#define EFS_MAGIC	0x072959
-#define EFS_NEWMAGIC	0x07295a
-
-#define IS_EFS_MAGIC(x)	((x == EFS_MAGIC) || (x == EFS_NEWMAGIC))
-
-#define EFS_SUPER		1
-#define EFS_ROOTINODE		2
-
-/* efs superblock on disk */
-struct efs_super {
-	__be32		fs_size;        /* size of filesystem, in sectors */
-	__be32		fs_firstcg;     /* bb offset to first cg */
-	__be32		fs_cgfsize;     /* size of cylinder group in bb's */
-	__be16		fs_cgisize;     /* bb's of inodes per cylinder group */
-	__be16		fs_sectors;     /* sectors per track */
-	__be16		fs_heads;       /* heads per cylinder */
-	__be16		fs_ncg;         /* # of cylinder groups in filesystem */
-	__be16		fs_dirty;       /* fs needs to be fsck'd */
-	__be32		fs_time;        /* last super-block update */
-	__be32		fs_magic;       /* magic number */
-	char		fs_fname[6];    /* file system name */
-	char		fs_fpack[6];    /* file system pack name */
-	__be32		fs_bmsize;      /* size of bitmap in bytes */
-	__be32		fs_tfree;       /* total free data blocks */
-	__be32		fs_tinode;      /* total free inodes */
-	__be32		fs_bmblock;     /* bitmap location. */
-	__be32		fs_replsb;      /* Location of replicated superblock. */
-	__be32		fs_lastialloc;  /* last allocated inode */
-	char		fs_spare[20];   /* space for expansion - MUST BE ZERO */
-	__be32		fs_checksum;    /* checksum of volume portion of fs */
-};
-
-/* efs superblock information in memory */
-struct efs_sb_info {
-	__u32	fs_magic;	/* superblock magic number */
-	__u32	fs_start;	/* first block of filesystem */
-	__u32	first_block;	/* first data block in filesystem */
-	__u32	total_blocks;	/* total number of blocks in filesystem */
-	__u32	group_size;	/* # of blocks a group consists of */ 
-	__u32	data_free;	/* # of free data blocks */
-	__u32	inode_free;	/* # of free inodes */
-	__u16	inode_blocks;	/* # of blocks used for inodes in every grp */
-	__u16	total_groups;	/* # of groups */
-};
-
-#endif /* __EFS_FS_SB_H__ */
-