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efs: Remove EFS

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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It was superseded on IRIX around thirty years ago.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>
This commit is contained in:
Matthew Wilcox (Oracle)
2026-06-18 22:18:19 +01:00
committed by Christian Brauner
parent dc59e4fea9
commit 969076f31b
14 changed files with 0 additions and 1292 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
MAINTAINERS
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@@ -9493,11 +9493,6 @@ L: linux-fbdev@vger.kernel.org
S: Maintained
F: drivers/video/fbdev/efifb.c
EFS FILESYSTEM
S: Orphan
W: http://aeschi.ch.eu.org/efs/
F: fs/efs/
EHEA (IBM pSeries eHEA 10Gb ethernet adapter) DRIVER
L: netdev@vger.kernel.org
S: Orphan

1
fs/Kconfig
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@@ -315,7 +315,6 @@ source "fs/hfs/Kconfig"
source "fs/hfsplus/Kconfig"
source "fs/befs/Kconfig"
source "fs/bfs/Kconfig"
source "fs/efs/Kconfig"
source "fs/jffs2/Kconfig"
# UBIFS File system configuration
source "fs/ubifs/Kconfig"

1
fs/Makefile
View File

@@ -92,7 +92,6 @@ obj-$(CONFIG_HPFS_FS) += hpfs/
obj-$(CONFIG_NTFS_FS) += ntfs/
obj-$(CONFIG_NTFS3_FS) += ntfs3/
obj-$(CONFIG_UFS_FS) += ufs/
obj-$(CONFIG_EFS_FS) += efs/
obj-$(CONFIG_JFFS2_FS) += jffs2/
obj-$(CONFIG_UBIFS_FS) += ubifs/
obj-$(CONFIG_AFFS_FS) += affs/

16
fs/efs/Kconfig
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@@ -1,16 +0,0 @@
# SPDX-License-Identifier: GPL-2.0-only
config EFS_FS
tristate "EFS file system support (read only)"
depends on BLOCK
select BUFFER_HEAD
help
EFS is an older file system used for non-ISO9660 CD-ROMs and hard
disk partitions by SGI's IRIX operating system (IRIX 6.0 and newer
uses the XFS file system for hard disk partitions however).
This implementation only offers read-only access. If you don't know
what all this is about, it's safe to say N. For more information
about EFS see its home page at <http://aeschi.ch.eu.org/efs/>.
To compile the EFS file system support as a module, choose M here: the
module will be called efs.

8
fs/efs/Makefile
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@@ -1,8 +0,0 @@
# SPDX-License-Identifier: GPL-2.0-only
#
# Makefile for the linux efs-filesystem routines.
#
obj-$(CONFIG_EFS_FS) += efs.o
efs-objs := super.o inode.o namei.o dir.o file.o symlink.o

105
fs/efs/dir.c
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@@ -1,105 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/*
* dir.c
*
* Copyright (c) 1999 Al Smith
*/
#include <linux/buffer_head.h>
#include <linux/filelock.h>
#include "efs.h"
static int efs_readdir(struct file *, struct dir_context *);
const struct file_operations efs_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.iterate_shared = efs_readdir,
.setlease = generic_setlease,
};
const struct inode_operations efs_dir_inode_operations = {
.lookup = efs_lookup,
};
static int efs_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
efs_block_t block;
int slot;
if (inode->i_size & (EFS_DIRBSIZE-1))
pr_warn("%s(): directory size not a multiple of EFS_DIRBSIZE\n",
__func__);
/* work out where this entry can be found */
block = ctx->pos >> EFS_DIRBSIZE_BITS;
/* each block contains at most 256 slots */
slot = ctx->pos & 0xff;
/* look at all blocks */
while (block < inode->i_blocks) {
struct efs_dir *dirblock;
struct buffer_head *bh;
/* read the dir block */
bh = sb_bread(inode->i_sb, efs_bmap(inode, block));
if (!bh) {
pr_err("%s(): failed to read dir block %d\n",
__func__, block);
break;
}
dirblock = (struct efs_dir *) bh->b_data;
if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) {
pr_err("%s(): invalid directory block\n", __func__);
brelse(bh);
break;
}
for (; slot < dirblock->slots; slot++) {
struct efs_dentry *dirslot;
efs_ino_t inodenum;
const char *nameptr;
int namelen;
if (dirblock->space[slot] == 0)
continue;
dirslot = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot));
inodenum = be32_to_cpu(dirslot->inode);
namelen = dirslot->namelen;
nameptr = dirslot->name;
pr_debug("%s(): block %d slot %d/%d: inode %u, name \"%s\", namelen %u\n",
__func__, block, slot, dirblock->slots-1,
inodenum, nameptr, namelen);
if (!namelen)
continue;
/* found the next entry */
ctx->pos = (block << EFS_DIRBSIZE_BITS) | slot;
/* sanity check */
if (nameptr - (char *) dirblock + namelen > EFS_DIRBSIZE) {
pr_warn("directory entry %d exceeds directory block\n",
slot);
continue;
}
/* copy filename and data in dirslot */
if (!dir_emit(ctx, nameptr, namelen, inodenum, DT_UNKNOWN)) {
brelse(bh);
return 0;
}
}
brelse(bh);
slot = 0;
block++;
}
ctx->pos = (block << EFS_DIRBSIZE_BITS) | slot;
return 0;
}

144
fs/efs/efs.h
View File

@@ -1,144 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 1999 Al Smith, <Al.Smith@aeschi.ch.eu.org>
*
* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
* Portions derived from IRIX header files (c) 1988 Silicon Graphics
*/
#ifndef _EFS_EFS_H_
#define _EFS_EFS_H_
#ifdef pr_fmt
#undef pr_fmt
#endif
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/fs.h>
#include <linux/uaccess.h>
#define EFS_VERSION "1.0a"
/* 1 block is 512 bytes */
#define EFS_BLOCKSIZE_BITS 9
#define EFS_BLOCKSIZE (1 << EFS_BLOCKSIZE_BITS)
typedef int32_t efs_block_t;
typedef uint32_t efs_ino_t;
#define EFS_DIRECTEXTENTS 12
/*
* layout of an extent, in memory and on disk. 8 bytes exactly.
*/
typedef union extent_u {
unsigned char raw[8];
struct extent_s {
unsigned int ex_magic:8; /* magic # (zero) */
unsigned int ex_bn:24; /* basic block */
unsigned int ex_length:8; /* numblocks in this extent */
unsigned int ex_offset:24; /* logical offset into file */
} cooked;
} efs_extent;
typedef struct edevs {
__be16 odev;
__be32 ndev;
} efs_devs;
/*
* extent based filesystem inode as it appears on disk. The efs inode
* is exactly 128 bytes long.
*/
struct efs_dinode {
__be16 di_mode; /* mode and type of file */
__be16 di_nlink; /* number of links to file */
__be16 di_uid; /* owner's user id */
__be16 di_gid; /* owner's group id */
__be32 di_size; /* number of bytes in file */
__be32 di_atime; /* time last accessed */
__be32 di_mtime; /* time last modified */
__be32 di_ctime; /* time created */
__be32 di_gen; /* generation number */
__be16 di_numextents; /* # of extents */
u_char di_version; /* version of inode */
u_char di_spare; /* spare - used by AFS */
union di_addr {
efs_extent di_extents[EFS_DIRECTEXTENTS];
efs_devs di_dev; /* device for IFCHR/IFBLK */
} di_u;
};
/* efs inode storage in memory */
struct efs_inode_info {
int numextents;
int lastextent;
efs_extent extents[EFS_DIRECTEXTENTS];
struct inode vfs_inode;
};
#include <linux/efs_fs_sb.h>
#define EFS_DIRBSIZE_BITS EFS_BLOCKSIZE_BITS
#define EFS_DIRBSIZE (1 << EFS_DIRBSIZE_BITS)
struct efs_dentry {
__be32 inode;
unsigned char namelen;
char name[3];
};
#define EFS_DENTSIZE (sizeof(struct efs_dentry) - 3 + 1)
#define EFS_MAXNAMELEN ((1 << (sizeof(char) * 8)) - 1)
#define EFS_DIRBLK_HEADERSIZE 4
#define EFS_DIRBLK_MAGIC 0xbeef /* moo */
struct efs_dir {
__be16 magic;
unsigned char firstused;
unsigned char slots;
unsigned char space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE];
};
#define EFS_MAXENTS \
((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \
(EFS_DENTSIZE + sizeof(char)))
#define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot])
#define EFS_REALOFF(offset) ((offset << 1))
static inline struct efs_inode_info *INODE_INFO(struct inode *inode)
{
return container_of(inode, struct efs_inode_info, vfs_inode);
}
static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb)
{
return sb->s_fs_info;
}
struct statfs;
struct fid;
extern const struct inode_operations efs_dir_inode_operations;
extern const struct file_operations efs_dir_operations;
extern const struct address_space_operations efs_symlink_aops;
extern struct inode *efs_iget(struct super_block *, unsigned long);
extern efs_block_t efs_map_block(struct inode *, efs_block_t);
extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int);
extern struct dentry *efs_lookup(struct inode *, struct dentry *, unsigned int);
extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
int fh_len, int fh_type);
extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
int fh_len, int fh_type);
extern struct dentry *efs_get_parent(struct dentry *);
extern int efs_bmap(struct inode *, int);
#endif /* _EFS_EFS_H_ */

42
fs/efs/file.c
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@@ -1,42 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/*
* file.c
*
* Copyright (c) 1999 Al Smith
*
* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
*/
#include <linux/buffer_head.h>
#include "efs.h"
int efs_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
int error = -EROFS;
long phys;
if (create)
return error;
if (iblock >= inode->i_blocks)
return 0;
phys = efs_map_block(inode, iblock);
if (phys)
map_bh(bh_result, inode->i_sb, phys);
return 0;
}
int efs_bmap(struct inode *inode, efs_block_t block) {
if (block < 0) {
pr_warn("%s(): block < 0\n", __func__);
return 0;
}
/* are we about to read past the end of a file ? */
if (!(block < inode->i_blocks))
return 0;
return efs_map_block(inode, block);
}

315
fs/efs/inode.c
View File

@@ -1,315 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* inode.c
*
* Copyright (c) 1999 Al Smith
*
* Portions derived from work (c) 1995,1996 Christian Vogelgsang,
* and from work (c) 1998 Mike Shaver.
*/
#include <linux/buffer_head.h>
#include <linux/module.h>
#include <linux/fs.h>
#include "efs.h"
#include <linux/efs_fs_sb.h>
static int efs_read_folio(struct file *file, struct folio *folio)
{
return block_read_full_folio(folio, efs_get_block);
}
static sector_t _efs_bmap(struct address_space *mapping, sector_t block)
{
return generic_block_bmap(mapping,block,efs_get_block);
}
static const struct address_space_operations efs_aops = {
.read_folio = efs_read_folio,
.bmap = _efs_bmap
};
static inline void extent_copy(efs_extent *src, efs_extent *dst) {
/*
* this is slightly evil. it doesn't just copy
* efs_extent from src to dst, it also mangles
* the bits so that dst ends up in cpu byte-order.
*/
dst->cooked.ex_magic = (unsigned int) src->raw[0];
dst->cooked.ex_bn = ((unsigned int) src->raw[1] << 16) |
((unsigned int) src->raw[2] << 8) |
((unsigned int) src->raw[3] << 0);
dst->cooked.ex_length = (unsigned int) src->raw[4];
dst->cooked.ex_offset = ((unsigned int) src->raw[5] << 16) |
((unsigned int) src->raw[6] << 8) |
((unsigned int) src->raw[7] << 0);
return;
}
struct inode *efs_iget(struct super_block *super, unsigned long ino)
{
int i, inode_index;
dev_t device;
u32 rdev;
struct buffer_head *bh;
struct efs_sb_info *sb = SUPER_INFO(super);
struct efs_inode_info *in;
efs_block_t block, offset;
struct efs_dinode *efs_inode;
struct inode *inode;
inode = iget_locked(super, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode_state_read_once(inode) & I_NEW))
return inode;
in = INODE_INFO(inode);
/*
** EFS layout:
**
** | cylinder group | cylinder group | cylinder group ..etc
** |inodes|data |inodes|data |inodes|data ..etc
**
** work out the inode block index, (considering initially that the
** inodes are stored as consecutive blocks). then work out the block
** number of that inode given the above layout, and finally the
** offset of the inode within that block.
*/
inode_index = inode->i_ino /
(EFS_BLOCKSIZE / sizeof(struct efs_dinode));
block = sb->fs_start + sb->first_block +
(sb->group_size * (inode_index / sb->inode_blocks)) +
(inode_index % sb->inode_blocks);
offset = (inode->i_ino %
(EFS_BLOCKSIZE / sizeof(struct efs_dinode))) *
sizeof(struct efs_dinode);
bh = sb_bread(inode->i_sb, block);
if (!bh) {
pr_warn("%s() failed at block %d\n", __func__, block);
goto read_inode_error;
}
efs_inode = (struct efs_dinode *) (bh->b_data + offset);
inode->i_mode = be16_to_cpu(efs_inode->di_mode);
set_nlink(inode, be16_to_cpu(efs_inode->di_nlink));
i_uid_write(inode, (uid_t)be16_to_cpu(efs_inode->di_uid));
i_gid_write(inode, (gid_t)be16_to_cpu(efs_inode->di_gid));
inode->i_size = be32_to_cpu(efs_inode->di_size);
inode_set_atime(inode, be32_to_cpu(efs_inode->di_atime), 0);
inode_set_mtime(inode, be32_to_cpu(efs_inode->di_mtime), 0);
inode_set_ctime(inode, be32_to_cpu(efs_inode->di_ctime), 0);
/* this is the number of blocks in the file */
if (inode->i_size == 0) {
inode->i_blocks = 0;
} else {
inode->i_blocks = ((inode->i_size - 1) >> EFS_BLOCKSIZE_BITS) + 1;
}
rdev = be16_to_cpu(efs_inode->di_u.di_dev.odev);
if (rdev == 0xffff) {
rdev = be32_to_cpu(efs_inode->di_u.di_dev.ndev);
if (sysv_major(rdev) > 0xfff)
device = 0;
else
device = MKDEV(sysv_major(rdev), sysv_minor(rdev));
} else
device = old_decode_dev(rdev);
/* get the number of extents for this object */
in->numextents = be16_to_cpu(efs_inode->di_numextents);
in->lastextent = 0;
/* copy the extents contained within the inode to memory */
for(i = 0; i < EFS_DIRECTEXTENTS; i++) {
extent_copy(&(efs_inode->di_u.di_extents[i]), &(in->extents[i]));
if (i < in->numextents && in->extents[i].cooked.ex_magic != 0) {
pr_warn("extent %d has bad magic number in inode %llu\n",
i, inode->i_ino);
brelse(bh);
goto read_inode_error;
}
}
brelse(bh);
pr_debug("efs_iget(): inode %llu, extents %d, mode %o\n",
inode->i_ino, in->numextents, inode->i_mode);
switch (inode->i_mode & S_IFMT) {
case S_IFDIR:
inode->i_op = &efs_dir_inode_operations;
inode->i_fop = &efs_dir_operations;
break;
case S_IFREG:
inode->i_fop = &generic_ro_fops;
inode->i_data.a_ops = &efs_aops;
break;
case S_IFLNK:
inode->i_op = &page_symlink_inode_operations;
inode_nohighmem(inode);
inode->i_data.a_ops = &efs_symlink_aops;
break;
case S_IFCHR:
case S_IFBLK:
case S_IFIFO:
init_special_inode(inode, inode->i_mode, device);
break;
default:
pr_warn("unsupported inode mode %o\n", inode->i_mode);
goto read_inode_error;
break;
}
unlock_new_inode(inode);
return inode;
read_inode_error:
pr_warn("failed to read inode %llu\n", inode->i_ino);
iget_failed(inode);
return ERR_PTR(-EIO);
}
static inline efs_block_t
efs_extent_check(efs_extent *ptr, efs_block_t block, struct efs_sb_info *sb) {
efs_block_t start;
efs_block_t length;
efs_block_t offset;
/*
* given an extent and a logical block within a file,
* can this block be found within this extent ?
*/
start = ptr->cooked.ex_bn;
length = ptr->cooked.ex_length;
offset = ptr->cooked.ex_offset;
if ((block >= offset) && (block < offset+length)) {
return(sb->fs_start + start + block - offset);
} else {
return 0;
}
}
efs_block_t efs_map_block(struct inode *inode, efs_block_t block) {
struct efs_sb_info *sb = SUPER_INFO(inode->i_sb);
struct efs_inode_info *in = INODE_INFO(inode);
struct buffer_head *bh = NULL;
int cur, last, first = 1;
int ibase, ioffset, dirext, direxts, indext, indexts;
efs_block_t iblock, result = 0, lastblock = 0;
efs_extent ext, *exts;
last = in->lastextent;
if (in->numextents <= EFS_DIRECTEXTENTS) {
/* first check the last extent we returned */
if ((result = efs_extent_check(&in->extents[last], block, sb)))
return result;
/* if we only have one extent then nothing can be found */
if (in->numextents == 1) {
pr_err("%s() failed to map (1 extent)\n", __func__);
return 0;
}
direxts = in->numextents;
/*
* check the stored extents in the inode
* start with next extent and check forwards
*/
for(dirext = 1; dirext < direxts; dirext++) {
cur = (last + dirext) % in->numextents;
if ((result = efs_extent_check(&in->extents[cur], block, sb))) {
in->lastextent = cur;
return result;
}
}
pr_err("%s() failed to map block %u (dir)\n", __func__, block);
return 0;
}
pr_debug("%s(): indirect search for logical block %u\n",
__func__, block);
direxts = in->extents[0].cooked.ex_offset;
indexts = in->numextents;
for(indext = 0; indext < indexts; indext++) {
cur = (last + indext) % indexts;
/*
* work out which direct extent contains `cur'.
*
* also compute ibase: i.e. the number of the first
* indirect extent contained within direct extent `cur'.
*
*/
ibase = 0;
for(dirext = 0; cur < ibase && dirext < direxts; dirext++) {
ibase += in->extents[dirext].cooked.ex_length *
(EFS_BLOCKSIZE / sizeof(efs_extent));
}
if (dirext == direxts) {
/* should never happen */
pr_err("couldn't find direct extent for indirect extent %d (block %u)\n",
cur, block);
if (bh) brelse(bh);
return 0;
}
/* work out block number and offset of this indirect extent */
iblock = sb->fs_start + in->extents[dirext].cooked.ex_bn +
(cur - ibase) /
(EFS_BLOCKSIZE / sizeof(efs_extent));
ioffset = (cur - ibase) %
(EFS_BLOCKSIZE / sizeof(efs_extent));
if (first || lastblock != iblock) {
if (bh) brelse(bh);
bh = sb_bread(inode->i_sb, iblock);
if (!bh) {
pr_err("%s() failed at block %d\n",
__func__, iblock);
return 0;
}
pr_debug("%s(): read indirect extent block %d\n",
__func__, iblock);
first = 0;
lastblock = iblock;
}
exts = (efs_extent *) bh->b_data;
extent_copy(&(exts[ioffset]), &ext);
if (ext.cooked.ex_magic != 0) {
pr_err("extent %d has bad magic number in block %d\n",
cur, iblock);
if (bh) brelse(bh);
return 0;
}
if ((result = efs_extent_check(&ext, block, sb))) {
if (bh) brelse(bh);
in->lastextent = cur;
return result;
}
}
if (bh) brelse(bh);
pr_err("%s() failed to map block %u (indir)\n", __func__, block);
return 0;
}
MODULE_DESCRIPTION("Extent File System (efs)");
MODULE_LICENSE("GPL");

120
fs/efs/namei.c
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@@ -1,120 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/*
* namei.c
*
* Copyright (c) 1999 Al Smith
*
* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
*/
#include <linux/buffer_head.h>
#include <linux/string.h>
#include <linux/exportfs.h>
#include "efs.h"
static efs_ino_t efs_find_entry(struct inode *inode, const char *name, int len)
{
struct buffer_head *bh;
int slot, namelen;
char *nameptr;
struct efs_dir *dirblock;
struct efs_dentry *dirslot;
efs_ino_t inodenum;
efs_block_t block;
if (inode->i_size & (EFS_DIRBSIZE-1))
pr_warn("%s(): directory size not a multiple of EFS_DIRBSIZE\n",
__func__);
for(block = 0; block < inode->i_blocks; block++) {
bh = sb_bread(inode->i_sb, efs_bmap(inode, block));
if (!bh) {
pr_err("%s(): failed to read dir block %d\n",
__func__, block);
return 0;
}
dirblock = (struct efs_dir *) bh->b_data;
if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) {
pr_err("%s(): invalid directory block\n", __func__);
brelse(bh);
return 0;
}
for (slot = 0; slot < dirblock->slots; slot++) {
dirslot = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot));
namelen = dirslot->namelen;
nameptr = dirslot->name;
if ((namelen == len) && (!memcmp(name, nameptr, len))) {
inodenum = be32_to_cpu(dirslot->inode);
brelse(bh);
return inodenum;
}
}
brelse(bh);
}
return 0;
}
struct dentry *efs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
efs_ino_t inodenum;
struct inode *inode = NULL;
inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len);
if (inodenum)
inode = efs_iget(dir->i_sb, inodenum);
return d_splice_alias(inode, dentry);
}
static struct inode *efs_nfs_get_inode(struct super_block *sb, u64 ino,
u32 generation)
{
struct inode *inode;
if (ino == 0)
return ERR_PTR(-ESTALE);
inode = efs_iget(sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (generation && inode->i_generation != generation) {
iput(inode);
return ERR_PTR(-ESTALE);
}
return inode;
}
struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
int fh_len, int fh_type)
{
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
efs_nfs_get_inode);
}
struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
int fh_len, int fh_type)
{
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
efs_nfs_get_inode);
}
struct dentry *efs_get_parent(struct dentry *child)
{
struct dentry *parent = ERR_PTR(-ENOENT);
efs_ino_t ino;
ino = efs_find_entry(d_inode(child), "..", 2);
if (ino)
parent = d_obtain_alias(efs_iget(child->d_sb, ino));
return parent;
}

368
fs/efs/super.c
View File

@@ -1,368 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/*
* super.c
*
* Copyright (c) 1999 Al Smith
*
* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/exportfs.h>
#include <linux/slab.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
#include <linux/blkdev.h>
#include <linux/fs_context.h>
#include "efs.h"
#include <linux/efs_vh.h>
#include <linux/efs_fs_sb.h>
static int efs_statfs(struct dentry *dentry, struct kstatfs *buf);
static int efs_init_fs_context(struct fs_context *fc);
static void efs_kill_sb(struct super_block *s)
{
struct efs_sb_info *sbi = SUPER_INFO(s);
kill_block_super(s);
kfree(sbi);
}
static struct pt_types sgi_pt_types[] = {
{0x00, "SGI vh"},
{0x01, "SGI trkrepl"},
{0x02, "SGI secrepl"},
{0x03, "SGI raw"},
{0x04, "SGI bsd"},
{SGI_SYSV, "SGI sysv"},
{0x06, "SGI vol"},
{SGI_EFS, "SGI efs"},
{0x08, "SGI lv"},
{0x09, "SGI rlv"},
{0x0A, "SGI xfs"},
{0x0B, "SGI xfslog"},
{0x0C, "SGI xlv"},
{0x82, "Linux swap"},
{0x83, "Linux native"},
{0, NULL}
};
/*
* File system definition and registration.
*/
static struct file_system_type efs_fs_type = {
.owner = THIS_MODULE,
.name = "efs",
.kill_sb = efs_kill_sb,
.fs_flags = FS_REQUIRES_DEV,
.init_fs_context = efs_init_fs_context,
};
MODULE_ALIAS_FS("efs");
static struct kmem_cache * efs_inode_cachep;
static struct inode *efs_alloc_inode(struct super_block *sb)
{
struct efs_inode_info *ei;
ei = alloc_inode_sb(sb, efs_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
return &ei->vfs_inode;
}
static void efs_free_inode(struct inode *inode)
{
kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
}
static void init_once(void *foo)
{
struct efs_inode_info *ei = (struct efs_inode_info *) foo;
inode_init_once(&ei->vfs_inode);
}
static int __init init_inodecache(void)
{
efs_inode_cachep = kmem_cache_create("efs_inode_cache",
sizeof(struct efs_inode_info), 0,
SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT,
init_once);
if (efs_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static void destroy_inodecache(void)
{
/*
* Make sure all delayed rcu free inodes are flushed before we
* destroy cache.
*/
rcu_barrier();
kmem_cache_destroy(efs_inode_cachep);
}
static const struct super_operations efs_superblock_operations = {
.alloc_inode = efs_alloc_inode,
.free_inode = efs_free_inode,
.statfs = efs_statfs,
};
static const struct export_operations efs_export_ops = {
.encode_fh = generic_encode_ino32_fh,
.fh_to_dentry = efs_fh_to_dentry,
.fh_to_parent = efs_fh_to_parent,
.get_parent = efs_get_parent,
};
static int __init init_efs_fs(void) {
int err;
pr_info(EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
err = init_inodecache();
if (err)
goto out1;
err = register_filesystem(&efs_fs_type);
if (err)
goto out;
return 0;
out:
destroy_inodecache();
out1:
return err;
}
static void __exit exit_efs_fs(void) {
unregister_filesystem(&efs_fs_type);
destroy_inodecache();
}
module_init(init_efs_fs)
module_exit(exit_efs_fs)
static efs_block_t efs_validate_vh(struct volume_header *vh) {
int i;
__be32 cs, *ui;
int csum;
efs_block_t sblock = 0; /* shuts up gcc */
struct pt_types *pt_entry;
int pt_type, slice = -1;
if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
/*
* assume that we're dealing with a partition and allow
* read_super() to try and detect a valid superblock
* on the next block.
*/
return 0;
}
ui = ((__be32 *) (vh + 1)) - 1;
for(csum = 0; ui >= ((__be32 *) vh);) {
cs = *ui--;
csum += be32_to_cpu(cs);
}
if (csum) {
pr_warn("SGI disklabel: checksum bad, label corrupted\n");
return 0;
}
#ifdef DEBUG
pr_debug("bf: \"%16s\"\n", vh->vh_bootfile);
for(i = 0; i < NVDIR; i++) {
int j;
char name[VDNAMESIZE+1];
for(j = 0; j < VDNAMESIZE; j++) {
name[j] = vh->vh_vd[i].vd_name[j];
}
name[j] = (char) 0;
if (name[0]) {
pr_debug("vh: %8s block: 0x%08x size: 0x%08x\n",
name, (int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
(int) be32_to_cpu(vh->vh_vd[i].vd_nbytes));
}
}
#endif
for(i = 0; i < NPARTAB; i++) {
pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type);
for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) {
if (pt_type == pt_entry->pt_type) break;
}
#ifdef DEBUG
if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) {
pr_debug("pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
i, (int)be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
(int)be32_to_cpu(vh->vh_pt[i].pt_nblks),
pt_type, (pt_entry->pt_name) ?
pt_entry->pt_name : "unknown");
}
#endif
if (IS_EFS(pt_type)) {
sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
slice = i;
}
}
if (slice == -1) {
pr_notice("partition table contained no EFS partitions\n");
#ifdef DEBUG
} else {
pr_info("using slice %d (type %s, offset 0x%x)\n", slice,
(pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
sblock);
#endif
}
return sblock;
}
static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) {
if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic)))
return -1;
sb->fs_magic = be32_to_cpu(super->fs_magic);
sb->total_blocks = be32_to_cpu(super->fs_size);
sb->first_block = be32_to_cpu(super->fs_firstcg);
sb->group_size = be32_to_cpu(super->fs_cgfsize);
sb->data_free = be32_to_cpu(super->fs_tfree);
sb->inode_free = be32_to_cpu(super->fs_tinode);
sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
sb->total_groups = be16_to_cpu(super->fs_ncg);
return 0;
}
static int efs_fill_super(struct super_block *s, struct fs_context *fc)
{
struct efs_sb_info *sb;
struct buffer_head *bh;
struct inode *root;
sb = kzalloc_obj(struct efs_sb_info);
if (!sb)
return -ENOMEM;
s->s_fs_info = sb;
s->s_time_min = 0;
s->s_time_max = U32_MAX;
s->s_magic = EFS_SUPER_MAGIC;
if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
pr_err("device does not support %d byte blocks\n",
EFS_BLOCKSIZE);
return invalf(fc, "device does not support %d byte blocks\n",
EFS_BLOCKSIZE);
}
/* read the vh (volume header) block */
bh = sb_bread(s, 0);
if (!bh) {
pr_err("cannot read volume header\n");
return -EIO;
}
/*
* if this returns zero then we didn't find any partition table.
* this isn't (yet) an error - just assume for the moment that
* the device is valid and go on to search for a superblock.
*/
sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
brelse(bh);
if (sb->fs_start == -1) {
return -EINVAL;
}
bh = sb_bread(s, sb->fs_start + EFS_SUPER);
if (!bh) {
pr_err("cannot read superblock\n");
return -EIO;
}
if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
#ifdef DEBUG
pr_warn("invalid superblock at block %u\n",
sb->fs_start + EFS_SUPER);
#endif
brelse(bh);
return -EINVAL;
}
brelse(bh);
if (!sb_rdonly(s)) {
#ifdef DEBUG
pr_info("forcing read-only mode\n");
#endif
s->s_flags |= SB_RDONLY;
}
s->s_op = &efs_superblock_operations;
s->s_export_op = &efs_export_ops;
root = efs_iget(s, EFS_ROOTINODE);
if (IS_ERR(root)) {
pr_err("get root inode failed\n");
return PTR_ERR(root);
}
s->s_root = d_make_root(root);
if (!(s->s_root)) {
pr_err("get root dentry failed\n");
return -ENOMEM;
}
return 0;
}
static int efs_get_tree(struct fs_context *fc)
{
return get_tree_bdev(fc, efs_fill_super);
}
static int efs_reconfigure(struct fs_context *fc)
{
sync_filesystem(fc->root->d_sb);
fc->sb_flags |= SB_RDONLY;
return 0;
}
static const struct fs_context_operations efs_context_opts = {
.get_tree = efs_get_tree,
.reconfigure = efs_reconfigure,
};
/*
* Set up the filesystem mount context.
*/
static int efs_init_fs_context(struct fs_context *fc)
{
fc->ops = &efs_context_opts;
return 0;
}
static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) {
struct super_block *sb = dentry->d_sb;
struct efs_sb_info *sbi = SUPER_INFO(sb);
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */
buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */
buf->f_blocks = sbi->total_groups * /* total data blocks */
(sbi->group_size - sbi->inode_blocks);
buf->f_bfree = sbi->data_free; /* free data blocks */
buf->f_bavail = sbi->data_free; /* free blocks for non-root */
buf->f_files = sbi->total_groups * /* total inodes */
sbi->inode_blocks *
(EFS_BLOCKSIZE / sizeof(struct efs_dinode));
buf->f_ffree = sbi->inode_free; /* free inodes */
buf->f_fsid = u64_to_fsid(id);
buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */
return 0;
}

50
fs/efs/symlink.c
View File

@@ -1,50 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/*
* symlink.c
*
* Copyright (c) 1999 Al Smith
*
* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
*/
#include <linux/string.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include "efs.h"
static int efs_symlink_read_folio(struct file *file, struct folio *folio)
{
char *link = folio_address(folio);
struct buffer_head *bh;
struct inode *inode = folio->mapping->host;
efs_block_t size = inode->i_size;
int err;
err = -ENAMETOOLONG;
if (size > 2 * EFS_BLOCKSIZE)
goto fail;
/* read first 512 bytes of link target */
err = -EIO;
bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
if (!bh)
goto fail;
memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
brelse(bh);
if (size > EFS_BLOCKSIZE) {
bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
if (!bh)
goto fail;
memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
brelse(bh);
}
link[size] = '\0';
err = 0;
fail:
folio_end_read(folio, err == 0);
return err;
}
const struct address_space_operations efs_symlink_aops = {
.read_folio = efs_symlink_read_folio
};

54
include/linux/efs_vh.h
View File

@@ -1,54 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* efs_vh.h
*
* Copyright (c) 1999 Al Smith
*
* Portions derived from IRIX header files (c) 1985 MIPS Computer Systems, Inc.
*/
#ifndef __EFS_VH_H__
#define __EFS_VH_H__
#define VHMAGIC 0xbe5a941 /* volume header magic number */
#define NPARTAB 16 /* 16 unix partitions */
#define NVDIR 15 /* max of 15 directory entries */
#define BFNAMESIZE 16 /* max 16 chars in boot file name */
#define VDNAMESIZE 8
struct volume_directory {
char vd_name[VDNAMESIZE]; /* name */
__be32 vd_lbn; /* logical block number */
__be32 vd_nbytes; /* file length in bytes */
};
struct partition_table { /* one per logical partition */
__be32 pt_nblks; /* # of logical blks in partition */
__be32 pt_firstlbn; /* first lbn of partition */
__be32 pt_type; /* use of partition */
};
struct volume_header {
__be32 vh_magic; /* identifies volume header */
__be16 vh_rootpt; /* root partition number */
__be16 vh_swappt; /* swap partition number */
char vh_bootfile[BFNAMESIZE]; /* name of file to boot */
char pad[48]; /* device param space */
struct volume_directory vh_vd[NVDIR]; /* other vol hdr contents */
struct partition_table vh_pt[NPARTAB]; /* device partition layout */
__be32 vh_csum; /* volume header checksum */
__be32 vh_fill; /* fill out to 512 bytes */
};
/* partition type sysv is used for EFS format CD-ROM partitions */
#define SGI_SYSV 0x05
#define SGI_EFS 0x07
#define IS_EFS(x) (((x) == SGI_EFS) || ((x) == SGI_SYSV))
struct pt_types {
int pt_type;
char *pt_name;
};
#endif /* __EFS_VH_H__ */

63
include/uapi/linux/efs_fs_sb.h
View File

@@ -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__ */