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-rw-r--r--fs/adfs/Kconfig27
-rw-r--r--fs/adfs/Makefile7
-rw-r--r--fs/adfs/adfs.h209
-rw-r--r--fs/adfs/dir.c274
-rw-r--r--fs/adfs/dir_f.c486
-rw-r--r--fs/adfs/dir_f.h65
-rw-r--r--fs/adfs/dir_fplus.c265
-rw-r--r--fs/adfs/dir_fplus.h45
-rw-r--r--fs/adfs/file.c36
-rw-r--r--fs/adfs/inode.c371
-rw-r--r--fs/adfs/map.c290
-rw-r--r--fs/adfs/super.c566
12 files changed, 2641 insertions, 0 deletions
diff --git a/fs/adfs/Kconfig b/fs/adfs/Kconfig
new file mode 100644
index 000000000..c5a7787dd
--- /dev/null
+++ b/fs/adfs/Kconfig
@@ -0,0 +1,27 @@
+config ADFS_FS
+ tristate "ADFS file system support"
+ depends on BLOCK
+ help
+ The Acorn Disc Filing System is the standard file system of the
+ RiscOS operating system which runs on Acorn's ARM-based Risc PC
+ systems and the Acorn Archimedes range of machines. If you say Y
+ here, Linux will be able to read from ADFS partitions on hard drives
+ and from ADFS-formatted floppy discs. If you also want to be able to
+ write to those devices, say Y to "ADFS write support" below.
+
+ The ADFS partition should be the first partition (i.e.,
+ /dev/[hs]d?1) on each of your drives. Please read the file
+ <file:Documentation/filesystems/adfs.txt> for further details.
+
+ To compile this code as a module, choose M here: the module will be
+ called adfs.
+
+ If unsure, say N.
+
+config ADFS_FS_RW
+ bool "ADFS write support (DANGEROUS)"
+ depends on ADFS_FS
+ help
+ If you say Y here, you will be able to write to ADFS partitions on
+ hard drives and ADFS-formatted floppy disks. This is experimental
+ codes, so if you're unsure, say N.
diff --git a/fs/adfs/Makefile b/fs/adfs/Makefile
new file mode 100644
index 000000000..9b2d71a9a
--- /dev/null
+++ b/fs/adfs/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux adfs filesystem routines.
+#
+
+obj-$(CONFIG_ADFS_FS) += adfs.o
+
+adfs-objs := dir.o dir_f.o dir_fplus.o file.o inode.o map.o super.o
diff --git a/fs/adfs/adfs.h b/fs/adfs/adfs.h
new file mode 100644
index 000000000..c76db75f0
--- /dev/null
+++ b/fs/adfs/adfs.h
@@ -0,0 +1,209 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/fs.h>
+#include <linux/adfs_fs.h>
+
+/* Internal data structures for ADFS */
+
+#define ADFS_FREE_FRAG 0
+#define ADFS_BAD_FRAG 1
+#define ADFS_ROOT_FRAG 2
+
+#define ADFS_NDA_OWNER_READ (1 << 0)
+#define ADFS_NDA_OWNER_WRITE (1 << 1)
+#define ADFS_NDA_LOCKED (1 << 2)
+#define ADFS_NDA_DIRECTORY (1 << 3)
+#define ADFS_NDA_EXECUTE (1 << 4)
+#define ADFS_NDA_PUBLIC_READ (1 << 5)
+#define ADFS_NDA_PUBLIC_WRITE (1 << 6)
+
+#include "dir_f.h"
+
+struct buffer_head;
+
+/*
+ * adfs file system inode data in memory
+ */
+struct adfs_inode_info {
+ loff_t mmu_private;
+ unsigned long parent_id; /* object id of parent */
+ __u32 loadaddr; /* RISC OS load address */
+ __u32 execaddr; /* RISC OS exec address */
+ unsigned int filetype; /* RISC OS file type */
+ unsigned int attr; /* RISC OS permissions */
+ unsigned int stamped:1; /* RISC OS file has date/time */
+ struct inode vfs_inode;
+};
+
+/*
+ * Forward-declare this
+ */
+struct adfs_discmap;
+struct adfs_dir_ops;
+
+/*
+ * ADFS file system superblock data in memory
+ */
+struct adfs_sb_info {
+ union { struct {
+ struct adfs_discmap *s_map; /* bh list containing map */
+ const struct adfs_dir_ops *s_dir; /* directory operations */
+ };
+ struct rcu_head rcu; /* used only at shutdown time */
+ };
+ kuid_t s_uid; /* owner uid */
+ kgid_t s_gid; /* owner gid */
+ umode_t s_owner_mask; /* ADFS owner perm -> unix perm */
+ umode_t s_other_mask; /* ADFS other perm -> unix perm */
+ int s_ftsuffix; /* ,xyz hex filetype suffix option */
+
+ __u32 s_ids_per_zone; /* max. no ids in one zone */
+ __u32 s_idlen; /* length of ID in map */
+ __u32 s_map_size; /* sector size of a map */
+ unsigned long s_size; /* total size (in blocks) of this fs */
+ signed int s_map2blk; /* shift left by this for map->sector*/
+ unsigned int s_log2sharesize;/* log2 share size */
+ __le32 s_version; /* disc format version */
+ unsigned int s_namelen; /* maximum number of characters in name */
+};
+
+static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
+{
+ return sb->s_fs_info;
+}
+
+static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
+{
+ return container_of(inode, struct adfs_inode_info, vfs_inode);
+}
+
+/*
+ * Directory handling
+ */
+struct adfs_dir {
+ struct super_block *sb;
+
+ int nr_buffers;
+ struct buffer_head *bh[4];
+
+ /* big directories need allocated buffers */
+ struct buffer_head **bh_fplus;
+
+ unsigned int pos;
+ unsigned int parent_id;
+
+ struct adfs_dirheader dirhead;
+ union adfs_dirtail dirtail;
+};
+
+/*
+ * This is the overall maximum name length
+ */
+#define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */
+struct object_info {
+ __u32 parent_id; /* parent object id */
+ __u32 file_id; /* object id */
+ __u32 loadaddr; /* load address */
+ __u32 execaddr; /* execution address */
+ __u32 size; /* size */
+ __u8 attr; /* RISC OS attributes */
+ unsigned int name_len; /* name length */
+ char name[ADFS_MAX_NAME_LEN];/* file name */
+
+ /* RISC OS file type (12-bit: derived from loadaddr) */
+ __u16 filetype;
+};
+
+/* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */
+static inline int append_filetype_suffix(char *buf, __u16 filetype)
+{
+ if (filetype == 0xffff) /* no explicit 12-bit file type was set */
+ return 0;
+
+ *buf++ = ',';
+ *buf++ = hex_asc_lo(filetype >> 8);
+ *buf++ = hex_asc_lo(filetype >> 4);
+ *buf++ = hex_asc_lo(filetype >> 0);
+ return 4;
+}
+
+struct adfs_dir_ops {
+ int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
+ int (*setpos)(struct adfs_dir *dir, unsigned int fpos);
+ int (*getnext)(struct adfs_dir *dir, struct object_info *obj);
+ int (*update)(struct adfs_dir *dir, struct object_info *obj);
+ int (*create)(struct adfs_dir *dir, struct object_info *obj);
+ int (*remove)(struct adfs_dir *dir, struct object_info *obj);
+ int (*sync)(struct adfs_dir *dir);
+ void (*free)(struct adfs_dir *dir);
+};
+
+struct adfs_discmap {
+ struct buffer_head *dm_bh;
+ __u32 dm_startblk;
+ unsigned int dm_startbit;
+ unsigned int dm_endbit;
+};
+
+/* Inode stuff */
+struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
+int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
+int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
+
+/* map.c */
+extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
+extern unsigned int adfs_map_free(struct super_block *sb);
+
+/* Misc */
+__printf(3, 4)
+void __adfs_error(struct super_block *sb, const char *function,
+ const char *fmt, ...);
+#define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
+
+/* super.c */
+
+/*
+ * Inodes and file operations
+ */
+
+/* dir_*.c */
+extern const struct inode_operations adfs_dir_inode_operations;
+extern const struct file_operations adfs_dir_operations;
+extern const struct dentry_operations adfs_dentry_operations;
+extern const struct adfs_dir_ops adfs_f_dir_ops;
+extern const struct adfs_dir_ops adfs_fplus_dir_ops;
+
+extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
+ int wait);
+
+/* file.c */
+extern const struct inode_operations adfs_file_inode_operations;
+extern const struct file_operations adfs_file_operations;
+
+static inline __u32 signed_asl(__u32 val, signed int shift)
+{
+ if (shift >= 0)
+ val <<= shift;
+ else
+ val >>= -shift;
+ return val;
+}
+
+/*
+ * Calculate the address of a block in an object given the block offset
+ * and the object identity.
+ *
+ * The root directory ID should always be looked up in the map [3.4]
+ */
+static inline int
+__adfs_block_map(struct super_block *sb, unsigned int object_id,
+ unsigned int block)
+{
+ if (object_id & 255) {
+ unsigned int off;
+
+ off = (object_id & 255) - 1;
+ block += off << ADFS_SB(sb)->s_log2sharesize;
+ }
+
+ return adfs_map_lookup(sb, object_id >> 8, block);
+}
diff --git a/fs/adfs/dir.c b/fs/adfs/dir.c
new file mode 100644
index 000000000..e18eff854
--- /dev/null
+++ b/fs/adfs/dir.c
@@ -0,0 +1,274 @@
+/*
+ * linux/fs/adfs/dir.c
+ *
+ * Copyright (C) 1999-2000 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Common directory handling for ADFS
+ */
+#include "adfs.h"
+
+/*
+ * For future. This should probably be per-directory.
+ */
+static DEFINE_RWLOCK(adfs_dir_lock);
+
+static int
+adfs_readdir(struct file *file, struct dir_context *ctx)
+{
+ struct inode *inode = file_inode(file);
+ struct super_block *sb = inode->i_sb;
+ const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
+ struct object_info obj;
+ struct adfs_dir dir;
+ int ret = 0;
+
+ if (ctx->pos >> 32)
+ return 0;
+
+ ret = ops->read(sb, inode->i_ino, inode->i_size, &dir);
+ if (ret)
+ return ret;
+
+ if (ctx->pos == 0) {
+ if (!dir_emit_dot(file, ctx))
+ goto free_out;
+ ctx->pos = 1;
+ }
+ if (ctx->pos == 1) {
+ if (!dir_emit(ctx, "..", 2, dir.parent_id, DT_DIR))
+ goto free_out;
+ ctx->pos = 2;
+ }
+
+ read_lock(&adfs_dir_lock);
+
+ ret = ops->setpos(&dir, ctx->pos - 2);
+ if (ret)
+ goto unlock_out;
+ while (ops->getnext(&dir, &obj) == 0) {
+ if (!dir_emit(ctx, obj.name, obj.name_len,
+ obj.file_id, DT_UNKNOWN))
+ break;
+ ctx->pos++;
+ }
+
+unlock_out:
+ read_unlock(&adfs_dir_lock);
+
+free_out:
+ ops->free(&dir);
+ return ret;
+}
+
+int
+adfs_dir_update(struct super_block *sb, struct object_info *obj, int wait)
+{
+ int ret = -EINVAL;
+#ifdef CONFIG_ADFS_FS_RW
+ const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
+ struct adfs_dir dir;
+
+ printk(KERN_INFO "adfs_dir_update: object %06X in dir %06X\n",
+ obj->file_id, obj->parent_id);
+
+ if (!ops->update) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = ops->read(sb, obj->parent_id, 0, &dir);
+ if (ret)
+ goto out;
+
+ write_lock(&adfs_dir_lock);
+ ret = ops->update(&dir, obj);
+ write_unlock(&adfs_dir_lock);
+
+ if (wait) {
+ int err = ops->sync(&dir);
+ if (!ret)
+ ret = err;
+ }
+
+ ops->free(&dir);
+out:
+#endif
+ return ret;
+}
+
+static int
+adfs_match(const struct qstr *name, struct object_info *obj)
+{
+ int i;
+
+ if (name->len != obj->name_len)
+ return 0;
+
+ for (i = 0; i < name->len; i++) {
+ char c1, c2;
+
+ c1 = name->name[i];
+ c2 = obj->name[i];
+
+ if (c1 >= 'A' && c1 <= 'Z')
+ c1 += 'a' - 'A';
+ if (c2 >= 'A' && c2 <= 'Z')
+ c2 += 'a' - 'A';
+
+ if (c1 != c2)
+ return 0;
+ }
+ return 1;
+}
+
+static int
+adfs_dir_lookup_byname(struct inode *inode, const struct qstr *name, struct object_info *obj)
+{
+ struct super_block *sb = inode->i_sb;
+ const struct adfs_dir_ops *ops = ADFS_SB(sb)->s_dir;
+ struct adfs_dir dir;
+ int ret;
+
+ ret = ops->read(sb, inode->i_ino, inode->i_size, &dir);
+ if (ret)
+ goto out;
+
+ if (ADFS_I(inode)->parent_id != dir.parent_id) {
+ adfs_error(sb, "parent directory changed under me! (%lx but got %x)\n",
+ ADFS_I(inode)->parent_id, dir.parent_id);
+ ret = -EIO;
+ goto free_out;
+ }
+
+ obj->parent_id = inode->i_ino;
+
+ read_lock(&adfs_dir_lock);
+
+ ret = ops->setpos(&dir, 0);
+ if (ret)
+ goto unlock_out;
+
+ ret = -ENOENT;
+ while (ops->getnext(&dir, obj) == 0) {
+ if (adfs_match(name, obj)) {
+ ret = 0;
+ break;
+ }
+ }
+
+unlock_out:
+ read_unlock(&adfs_dir_lock);
+
+free_out:
+ ops->free(&dir);
+out:
+ return ret;
+}
+
+const struct file_operations adfs_dir_operations = {
+ .read = generic_read_dir,
+ .llseek = generic_file_llseek,
+ .iterate = adfs_readdir,
+ .fsync = generic_file_fsync,
+};
+
+static int
+adfs_hash(const struct dentry *parent, struct qstr *qstr)
+{
+ const unsigned int name_len = ADFS_SB(parent->d_sb)->s_namelen;
+ const unsigned char *name;
+ unsigned long hash;
+ int i;
+
+ if (qstr->len < name_len)
+ return 0;
+
+ /*
+ * Truncate the name in place, avoids
+ * having to define a compare function.
+ */
+ qstr->len = i = name_len;
+ name = qstr->name;
+ hash = init_name_hash(parent);
+ while (i--) {
+ char c;
+
+ c = *name++;
+ if (c >= 'A' && c <= 'Z')
+ c += 'a' - 'A';
+
+ hash = partial_name_hash(c, hash);
+ }
+ qstr->hash = end_name_hash(hash);
+
+ return 0;
+}
+
+/*
+ * Compare two names, taking note of the name length
+ * requirements of the underlying filesystem.
+ */
+static int
+adfs_compare(const struct dentry *dentry,
+ unsigned int len, const char *str, const struct qstr *name)
+{
+ int i;
+
+ if (len != name->len)
+ return 1;
+
+ for (i = 0; i < name->len; i++) {
+ char a, b;
+
+ a = str[i];
+ b = name->name[i];
+
+ if (a >= 'A' && a <= 'Z')
+ a += 'a' - 'A';
+ if (b >= 'A' && b <= 'Z')
+ b += 'a' - 'A';
+
+ if (a != b)
+ return 1;
+ }
+ return 0;
+}
+
+const struct dentry_operations adfs_dentry_operations = {
+ .d_hash = adfs_hash,
+ .d_compare = adfs_compare,
+};
+
+static struct dentry *
+adfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
+{
+ struct inode *inode = NULL;
+ struct object_info obj;
+ int error;
+
+ error = adfs_dir_lookup_byname(dir, &dentry->d_name, &obj);
+ if (error == 0) {
+ /*
+ * This only returns NULL if get_empty_inode
+ * fails.
+ */
+ inode = adfs_iget(dir->i_sb, &obj);
+ if (!inode)
+ inode = ERR_PTR(-EACCES);
+ } else if (error != -ENOENT) {
+ inode = ERR_PTR(error);
+ }
+ return d_splice_alias(inode, dentry);
+}
+
+/*
+ * directories can handle most operations...
+ */
+const struct inode_operations adfs_dir_inode_operations = {
+ .lookup = adfs_lookup,
+ .setattr = adfs_notify_change,
+};
diff --git a/fs/adfs/dir_f.c b/fs/adfs/dir_f.c
new file mode 100644
index 000000000..0fbfd0b04
--- /dev/null
+++ b/fs/adfs/dir_f.c
@@ -0,0 +1,486 @@
+/*
+ * linux/fs/adfs/dir_f.c
+ *
+ * Copyright (C) 1997-1999 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * E and F format directory handling
+ */
+#include <linux/buffer_head.h>
+#include "adfs.h"
+#include "dir_f.h"
+
+static void adfs_f_free(struct adfs_dir *dir);
+
+/*
+ * Read an (unaligned) value of length 1..4 bytes
+ */
+static inline unsigned int adfs_readval(unsigned char *p, int len)
+{
+ unsigned int val = 0;
+
+ switch (len) {
+ case 4: val |= p[3] << 24;
+ case 3: val |= p[2] << 16;
+ case 2: val |= p[1] << 8;
+ default: val |= p[0];
+ }
+ return val;
+}
+
+static inline void adfs_writeval(unsigned char *p, int len, unsigned int val)
+{
+ switch (len) {
+ case 4: p[3] = val >> 24;
+ case 3: p[2] = val >> 16;
+ case 2: p[1] = val >> 8;
+ default: p[0] = val;
+ }
+}
+
+static inline int adfs_readname(char *buf, char *ptr, int maxlen)
+{
+ char *old_buf = buf;
+
+ while ((unsigned char)*ptr >= ' ' && maxlen--) {
+ if (*ptr == '/')
+ *buf++ = '.';
+ else
+ *buf++ = *ptr;
+ ptr++;
+ }
+
+ return buf - old_buf;
+}
+
+#define ror13(v) ((v >> 13) | (v << 19))
+
+#define dir_u8(idx) \
+ ({ int _buf = idx >> blocksize_bits; \
+ int _off = idx - (_buf << blocksize_bits);\
+ *(u8 *)(bh[_buf]->b_data + _off); \
+ })
+
+#define dir_u32(idx) \
+ ({ int _buf = idx >> blocksize_bits; \
+ int _off = idx - (_buf << blocksize_bits);\
+ *(__le32 *)(bh[_buf]->b_data + _off); \
+ })
+
+#define bufoff(_bh,_idx) \
+ ({ int _buf = _idx >> blocksize_bits; \
+ int _off = _idx - (_buf << blocksize_bits);\
+ (u8 *)(_bh[_buf]->b_data + _off); \
+ })
+
+/*
+ * There are some algorithms that are nice in
+ * assembler, but a bitch in C... This is one
+ * of them.
+ */
+static u8
+adfs_dir_checkbyte(const struct adfs_dir *dir)
+{
+ struct buffer_head * const *bh = dir->bh;
+ const int blocksize_bits = dir->sb->s_blocksize_bits;
+ union { __le32 *ptr32; u8 *ptr8; } ptr, end;
+ u32 dircheck = 0;
+ int last = 5 - 26;
+ int i = 0;
+
+ /*
+ * Accumulate each word up to the last whole
+ * word of the last directory entry. This
+ * can spread across several buffer heads.
+ */
+ do {
+ last += 26;
+ do {
+ dircheck = le32_to_cpu(dir_u32(i)) ^ ror13(dircheck);
+
+ i += sizeof(u32);
+ } while (i < (last & ~3));
+ } while (dir_u8(last) != 0);
+
+ /*
+ * Accumulate the last few bytes. These
+ * bytes will be within the same bh.
+ */
+ if (i != last) {
+ ptr.ptr8 = bufoff(bh, i);
+ end.ptr8 = ptr.ptr8 + last - i;
+
+ do {
+ dircheck = *ptr.ptr8++ ^ ror13(dircheck);
+ } while (ptr.ptr8 < end.ptr8);
+ }
+
+ /*
+ * The directory tail is in the final bh
+ * Note that contary to the RISC OS PRMs,
+ * the first few bytes are NOT included
+ * in the check. All bytes are in the
+ * same bh.
+ */
+ ptr.ptr8 = bufoff(bh, 2008);
+ end.ptr8 = ptr.ptr8 + 36;
+
+ do {
+ __le32 v = *ptr.ptr32++;
+ dircheck = le32_to_cpu(v) ^ ror13(dircheck);
+ } while (ptr.ptr32 < end.ptr32);
+
+ return (dircheck ^ (dircheck >> 8) ^ (dircheck >> 16) ^ (dircheck >> 24)) & 0xff;
+}
+
+/*
+ * Read and check that a directory is valid
+ */
+static int
+adfs_dir_read(struct super_block *sb, unsigned long object_id,
+ unsigned int size, struct adfs_dir *dir)
+{
+ const unsigned int blocksize_bits = sb->s_blocksize_bits;
+ int blk = 0;
+
+ /*
+ * Directories which are not a multiple of 2048 bytes
+ * are considered bad v2 [3.6]
+ */
+ if (size & 2047)
+ goto bad_dir;
+
+ size >>= blocksize_bits;
+
+ dir->nr_buffers = 0;
+ dir->sb = sb;
+
+ for (blk = 0; blk < size; blk++) {
+ int phys;
+
+ phys = __adfs_block_map(sb, object_id, blk);
+ if (!phys) {
+ adfs_error(sb, "dir object %lX has a hole at offset %d",
+ object_id, blk);
+ goto release_buffers;
+ }
+
+ dir->bh[blk] = sb_bread(sb, phys);
+ if (!dir->bh[blk])
+ goto release_buffers;
+ }
+
+ memcpy(&dir->dirhead, bufoff(dir->bh, 0), sizeof(dir->dirhead));
+ memcpy(&dir->dirtail, bufoff(dir->bh, 2007), sizeof(dir->dirtail));
+
+ if (dir->dirhead.startmasseq != dir->dirtail.new.endmasseq ||
+ memcmp(&dir->dirhead.startname, &dir->dirtail.new.endname, 4))
+ goto bad_dir;
+
+ if (memcmp(&dir->dirhead.startname, "Nick", 4) &&
+ memcmp(&dir->dirhead.startname, "Hugo", 4))
+ goto bad_dir;
+
+ if (adfs_dir_checkbyte(dir) != dir->dirtail.new.dircheckbyte)
+ goto bad_dir;
+
+ dir->nr_buffers = blk;
+
+ return 0;
+
+bad_dir:
+ adfs_error(sb, "corrupted directory fragment %lX",
+ object_id);
+release_buffers:
+ for (blk -= 1; blk >= 0; blk -= 1)
+ brelse(dir->bh[blk]);
+
+ dir->sb = NULL;
+
+ return -EIO;
+}
+
+/*
+ * convert a disk-based directory entry to a Linux ADFS directory entry
+ */
+static inline void
+adfs_dir2obj(struct adfs_dir *dir, struct object_info *obj,
+ struct adfs_direntry *de)
+{
+ obj->name_len = adfs_readname(obj->name, de->dirobname, ADFS_F_NAME_LEN);
+ obj->file_id = adfs_readval(de->dirinddiscadd, 3);
+ obj->loadaddr = adfs_readval(de->dirload, 4);
+ obj->execaddr = adfs_readval(de->direxec, 4);
+ obj->size = adfs_readval(de->dirlen, 4);
+ obj->attr = de->newdiratts;
+ obj->filetype = -1;
+
+ /*
+ * object is a file and is filetyped and timestamped?
+ * RISC OS 12-bit filetype is stored in load_address[19:8]
+ */
+ if ((0 == (obj->attr & ADFS_NDA_DIRECTORY)) &&
+ (0xfff00000 == (0xfff00000 & obj->loadaddr))) {
+ obj->filetype = (__u16) ((0x000fff00 & obj->loadaddr) >> 8);
+
+ /* optionally append the ,xyz hex filetype suffix */
+ if (ADFS_SB(dir->sb)->s_ftsuffix)
+ obj->name_len +=
+ append_filetype_suffix(
+ &obj->name[obj->name_len],
+ obj->filetype);
+ }
+}
+
+/*
+ * convert a Linux ADFS directory entry to a disk-based directory entry
+ */
+static inline void
+adfs_obj2dir(struct adfs_direntry *de, struct object_info *obj)
+{
+ adfs_writeval(de->dirinddiscadd, 3, obj->file_id);
+ adfs_writeval(de->dirload, 4, obj->loadaddr);
+ adfs_writeval(de->direxec, 4, obj->execaddr);
+ adfs_writeval(de->dirlen, 4, obj->size);
+ de->newdiratts = obj->attr;
+}
+
+/*
+ * get a directory entry. Note that the caller is responsible
+ * for holding the relevant locks.
+ */
+static int
+__adfs_dir_get(struct adfs_dir *dir, int pos, struct object_info *obj)
+{
+ struct super_block *sb = dir->sb;
+ struct adfs_direntry de;
+ int thissize, buffer, offset;
+
+ buffer = pos >> sb->s_blocksize_bits;
+
+ if (buffer > dir->nr_buffers)
+ return -EINVAL;
+
+ offset = pos & (sb->s_blocksize - 1);
+ thissize = sb->s_blocksize - offset;
+ if (thissize > 26)
+ thissize = 26;
+
+ memcpy(&de, dir->bh[buffer]->b_data + offset, thissize);
+ if (thissize != 26)
+ memcpy(((char *)&de) + thissize, dir->bh[buffer + 1]->b_data,
+ 26 - thissize);
+
+ if (!de.dirobname[0])
+ return -ENOENT;
+
+ adfs_dir2obj(dir, obj, &de);
+
+ return 0;
+}
+
+static int
+__adfs_dir_put(struct adfs_dir *dir, int pos, struct object_info *obj)
+{
+ struct super_block *sb = dir->sb;
+ struct adfs_direntry de;
+ int thissize, buffer, offset;
+
+ buffer = pos >> sb->s_blocksize_bits;
+
+ if (buffer > dir->nr_buffers)
+ return -EINVAL;
+
+ offset = pos & (sb->s_blocksize - 1);
+ thissize = sb->s_blocksize - offset;
+ if (thissize > 26)
+ thissize = 26;
+
+ /*
+ * Get the entry in total
+ */
+ memcpy(&de, dir->bh[buffer]->b_data + offset, thissize);
+ if (thissize != 26)
+ memcpy(((char *)&de) + thissize, dir->bh[buffer + 1]->b_data,
+ 26 - thissize);
+
+ /*
+ * update it
+ */
+ adfs_obj2dir(&de, obj);
+
+ /*
+ * Put the new entry back
+ */
+ memcpy(dir->bh[buffer]->b_data + offset, &de, thissize);
+ if (thissize != 26)
+ memcpy(dir->bh[buffer + 1]->b_data, ((char *)&de) + thissize,
+ 26 - thissize);
+
+ return 0;
+}
+
+/*
+ * the caller is responsible for holding the necessary
+ * locks.
+ */
+static int
+adfs_dir_find_entry(struct adfs_dir *dir, unsigned long object_id)
+{
+ int pos, ret;
+
+ ret = -ENOENT;
+
+ for (pos = 5; pos < ADFS_NUM_DIR_ENTRIES * 26 + 5; pos += 26) {
+ struct object_info obj;
+
+ if (!__adfs_dir_get(dir, pos, &obj))
+ break;
+
+ if (obj.file_id == object_id) {
+ ret = pos;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static int
+adfs_f_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir)
+{
+ int ret;
+
+ if (sz != ADFS_NEWDIR_SIZE)
+ return -EIO;
+
+ ret = adfs_dir_read(sb, id, sz, dir);
+ if (ret)
+ adfs_error(sb, "unable to read directory");
+ else
+ dir->parent_id = adfs_readval(dir->dirtail.new.dirparent, 3);
+
+ return ret;
+}
+
+static int
+adfs_f_setpos(struct adfs_dir *dir, unsigned int fpos)
+{
+ if (fpos >= ADFS_NUM_DIR_ENTRIES)
+ return -ENOENT;
+
+ dir->pos = 5 + fpos * 26;
+ return 0;
+}
+
+static int
+adfs_f_getnext(struct adfs_dir *dir, struct object_info *obj)
+{
+ unsigned int ret;
+
+ ret = __adfs_dir_get(dir, dir->pos, obj);
+ if (ret == 0)
+ dir->pos += 26;
+
+ return ret;
+}
+
+static int
+adfs_f_update(struct adfs_dir *dir, struct object_info *obj)
+{
+ struct super_block *sb = dir->sb;
+ int ret, i;
+
+ ret = adfs_dir_find_entry(dir, obj->file_id);
+ if (ret < 0) {
+ adfs_error(dir->sb, "unable to locate entry to update");
+ goto out;
+ }
+
+ __adfs_dir_put(dir, ret, obj);
+
+ /*
+ * Increment directory sequence number
+ */
+ dir->bh[0]->b_data[0] += 1;
+ dir->bh[dir->nr_buffers - 1]->b_data[sb->s_blocksize - 6] += 1;
+
+ ret = adfs_dir_checkbyte(dir);
+ /*
+ * Update directory check byte
+ */
+ dir->bh[dir->nr_buffers - 1]->b_data[sb->s_blocksize - 1] = ret;
+
+#if 1
+ {
+ const unsigned int blocksize_bits = sb->s_blocksize_bits;
+
+ memcpy(&dir->dirhead, bufoff(dir->bh, 0), sizeof(dir->dirhead));
+ memcpy(&dir->dirtail, bufoff(dir->bh, 2007), sizeof(dir->dirtail));
+
+ if (dir->dirhead.startmasseq != dir->dirtail.new.endmasseq ||
+ memcmp(&dir->dirhead.startname, &dir->dirtail.new.endname, 4))
+ goto bad_dir;
+
+ if (memcmp(&dir->dirhead.startname, "Nick", 4) &&
+ memcmp(&dir->dirhead.startname, "Hugo", 4))
+ goto bad_dir;
+
+ if (adfs_dir_checkbyte(dir) != dir->dirtail.new.dircheckbyte)
+ goto bad_dir;
+ }
+#endif
+ for (i = dir->nr_buffers - 1; i >= 0; i--)
+ mark_buffer_dirty(dir->bh[i]);
+
+ ret = 0;
+out:
+ return ret;
+#if 1
+bad_dir:
+ adfs_error(dir->sb, "whoops! I broke a directory!");
+ return -EIO;
+#endif
+}
+
+static int
+adfs_f_sync(struct adfs_dir *dir)
+{
+ int err = 0;
+ int i;
+
+ for (i = dir->nr_buffers - 1; i >= 0; i--) {
+ struct buffer_head *bh = dir->bh[i];
+ sync_dirty_buffer(bh);
+ if (buffer_req(bh) && !buffer_uptodate(bh))
+ err = -EIO;
+ }
+
+ return err;
+}
+
+static void
+adfs_f_free(struct adfs_dir *dir)
+{
+ int i;
+
+ for (i = dir->nr_buffers - 1; i >= 0; i--) {
+ brelse(dir->bh[i]);
+ dir->bh[i] = NULL;
+ }
+
+ dir->nr_buffers = 0;
+ dir->sb = NULL;
+}
+
+const struct adfs_dir_ops adfs_f_dir_ops = {
+ .read = adfs_f_read,
+ .setpos = adfs_f_setpos,
+ .getnext = adfs_f_getnext,
+ .update = adfs_f_update,
+ .sync = adfs_f_sync,
+ .free = adfs_f_free
+};
diff --git a/fs/adfs/dir_f.h b/fs/adfs/dir_f.h
new file mode 100644
index 000000000..e47134040
--- /dev/null
+++ b/fs/adfs/dir_f.h
@@ -0,0 +1,65 @@
+/*
+ * linux/fs/adfs/dir_f.h
+ *
+ * Copyright (C) 1999 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Structures of directories on the F format disk
+ */
+#ifndef ADFS_DIR_F_H
+#define ADFS_DIR_F_H
+
+/*
+ * Directory header
+ */
+struct adfs_dirheader {
+ unsigned char startmasseq;
+ unsigned char startname[4];
+};
+
+#define ADFS_NEWDIR_SIZE 2048
+#define ADFS_NUM_DIR_ENTRIES 77
+
+/*
+ * Directory entries
+ */
+struct adfs_direntry {
+#define ADFS_F_NAME_LEN 10
+ char dirobname[ADFS_F_NAME_LEN];
+ __u8 dirload[4];
+ __u8 direxec[4];
+ __u8 dirlen[4];
+ __u8 dirinddiscadd[3];
+ __u8 newdiratts;
+};
+
+/*
+ * Directory tail
+ */
+union adfs_dirtail {
+ struct {
+ unsigned char dirlastmask;
+ char dirname[10];
+ unsigned char dirparent[3];
+ char dirtitle[19];
+ unsigned char reserved[14];
+ unsigned char endmasseq;
+ unsigned char endname[4];
+ unsigned char dircheckbyte;
+ } old;
+ struct {
+ unsigned char dirlastmask;
+ unsigned char reserved[2];
+ unsigned char dirparent[3];
+ char dirtitle[19];
+ char dirname[10];
+ unsigned char endmasseq;
+ unsigned char endname[4];
+ unsigned char dircheckbyte;
+ } new;
+};
+
+#endif
diff --git a/fs/adfs/dir_fplus.c b/fs/adfs/dir_fplus.c
new file mode 100644
index 000000000..c92cfb638
--- /dev/null
+++ b/fs/adfs/dir_fplus.c
@@ -0,0 +1,265 @@
+/*
+ * linux/fs/adfs/dir_fplus.c
+ *
+ * Copyright (C) 1997-1999 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/buffer_head.h>
+#include <linux/slab.h>
+#include "adfs.h"
+#include "dir_fplus.h"
+
+static int
+adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir)
+{
+ struct adfs_bigdirheader *h;
+ struct adfs_bigdirtail *t;
+ unsigned long block;
+ unsigned int blk, size;
+ int i, ret = -EIO;
+
+ dir->nr_buffers = 0;
+
+ /* start off using fixed bh set - only alloc for big dirs */
+ dir->bh_fplus = &dir->bh[0];
+
+ block = __adfs_block_map(sb, id, 0);
+ if (!block) {
+ adfs_error(sb, "dir object %X has a hole at offset 0", id);
+ goto out;
+ }
+
+ dir->bh_fplus[0] = sb_bread(sb, block);
+ if (!dir->bh_fplus[0])
+ goto out;
+ dir->nr_buffers += 1;
+
+ h = (struct adfs_bigdirheader *)dir->bh_fplus[0]->b_data;
+ size = le32_to_cpu(h->bigdirsize);
+ if (size != sz) {
+ printk(KERN_WARNING "adfs: adfs_fplus_read:"
+ " directory header size %X\n"
+ " does not match directory size %X\n",
+ size, sz);
+ }
+
+ if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||
+ h->bigdirversion[2] != 0 || size & 2047 ||
+ h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) {
+ printk(KERN_WARNING "adfs: dir object %X has"
+ " malformed dir header\n", id);
+ goto out;
+ }
+
+ size >>= sb->s_blocksize_bits;
+ if (size > ARRAY_SIZE(dir->bh)) {
+ /* this directory is too big for fixed bh set, must allocate */
+ struct buffer_head **bh_fplus =
+ kcalloc(size, sizeof(struct buffer_head *),
+ GFP_KERNEL);
+ if (!bh_fplus) {
+ ret = -ENOMEM;
+ adfs_error(sb, "not enough memory for"
+ " dir object %X (%d blocks)", id, size);
+ goto out;
+ }
+ dir->bh_fplus = bh_fplus;
+ /* copy over the pointer to the block that we've already read */
+ dir->bh_fplus[0] = dir->bh[0];
+ }
+
+ for (blk = 1; blk < size; blk++) {
+ block = __adfs_block_map(sb, id, blk);
+ if (!block) {
+ adfs_error(sb, "dir object %X has a hole at offset %d", id, blk);
+ goto out;
+ }
+
+ dir->bh_fplus[blk] = sb_bread(sb, block);
+ if (!dir->bh_fplus[blk]) {
+ adfs_error(sb, "dir object %x failed read for offset %d, mapped block %lX",
+ id, blk, block);
+ goto out;
+ }
+
+ dir->nr_buffers += 1;
+ }
+
+ t = (struct adfs_bigdirtail *)
+ (dir->bh_fplus[size - 1]->b_data + (sb->s_blocksize - 8));
+
+ if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||
+ t->bigdirendmasseq != h->startmasseq ||
+ t->reserved[0] != 0 || t->reserved[1] != 0) {
+ printk(KERN_WARNING "adfs: dir object %X has "
+ "malformed dir end\n", id);
+ goto out;
+ }
+
+ dir->parent_id = le32_to_cpu(h->bigdirparent);
+ dir->sb = sb;
+ return 0;
+
+out:
+ if (dir->bh_fplus) {
+ for (i = 0; i < dir->nr_buffers; i++)
+ brelse(dir->bh_fplus[i]);
+
+ if (&dir->bh[0] != dir->bh_fplus)
+ kfree(dir->bh_fplus);
+
+ dir->bh_fplus = NULL;
+ }
+
+ dir->nr_buffers = 0;
+ dir->sb = NULL;
+ return ret;
+}
+
+static int
+adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos)
+{
+ struct adfs_bigdirheader *h =
+ (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data;
+ int ret = -ENOENT;
+
+ if (fpos <= le32_to_cpu(h->bigdirentries)) {
+ dir->pos = fpos;
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static void
+dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len)
+{
+ struct super_block *sb = dir->sb;
+ unsigned int buffer, partial, remainder;
+
+ buffer = offset >> sb->s_blocksize_bits;
+ offset &= sb->s_blocksize - 1;
+
+ partial = sb->s_blocksize - offset;
+
+ if (partial >= len)
+ memcpy(to, dir->bh_fplus[buffer]->b_data + offset, len);
+ else {
+ char *c = (char *)to;
+
+ remainder = len - partial;
+
+ memcpy(c,
+ dir->bh_fplus[buffer]->b_data + offset,
+ partial);
+
+ memcpy(c + partial,
+ dir->bh_fplus[buffer + 1]->b_data,
+ remainder);
+ }
+}
+
+static int
+adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)
+{
+ struct adfs_bigdirheader *h =
+ (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data;
+ struct adfs_bigdirentry bde;
+ unsigned int offset;
+ int i, ret = -ENOENT;
+
+ if (dir->pos >= le32_to_cpu(h->bigdirentries))
+ goto out;
+
+ offset = offsetof(struct adfs_bigdirheader, bigdirname);
+ offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
+ offset += dir->pos * sizeof(struct adfs_bigdirentry);
+
+ dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry));
+
+ obj->loadaddr = le32_to_cpu(bde.bigdirload);
+ obj->execaddr = le32_to_cpu(bde.bigdirexec);
+ obj->size = le32_to_cpu(bde.bigdirlen);
+ obj->file_id = le32_to_cpu(bde.bigdirindaddr);
+ obj->attr = le32_to_cpu(bde.bigdirattr);
+ obj->name_len = le32_to_cpu(bde.bigdirobnamelen);
+
+ offset = offsetof(struct adfs_bigdirheader, bigdirname);
+ offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
+ offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry);
+ offset += le32_to_cpu(bde.bigdirobnameptr);
+
+ dir_memcpy(dir, offset, obj->name, obj->name_len);
+ for (i = 0; i < obj->name_len; i++)
+ if (obj->name[i] == '/')
+ obj->name[i] = '.';
+
+ obj->filetype = -1;
+
+ /*
+ * object is a file and is filetyped and timestamped?
+ * RISC OS 12-bit filetype is stored in load_address[19:8]
+ */
+ if ((0 == (obj->attr & ADFS_NDA_DIRECTORY)) &&
+ (0xfff00000 == (0xfff00000 & obj->loadaddr))) {
+ obj->filetype = (__u16) ((0x000fff00 & obj->loadaddr) >> 8);
+
+ /* optionally append the ,xyz hex filetype suffix */
+ if (ADFS_SB(dir->sb)->s_ftsuffix)
+ obj->name_len +=
+ append_filetype_suffix(
+ &obj->name[obj->name_len],
+ obj->filetype);
+ }
+
+ dir->pos += 1;
+ ret = 0;
+out:
+ return ret;
+}
+
+static int
+adfs_fplus_sync(struct adfs_dir *dir)
+{
+ int err = 0;
+ int i;
+
+ for (i = dir->nr_buffers - 1; i >= 0; i--) {
+ struct buffer_head *bh = dir->bh_fplus[i];
+ sync_dirty_buffer(bh);
+ if (buffer_req(bh) && !buffer_uptodate(bh))
+ err = -EIO;
+ }
+
+ return err;
+}
+
+static void
+adfs_fplus_free(struct adfs_dir *dir)
+{
+ int i;
+
+ if (dir->bh_fplus) {
+ for (i = 0; i < dir->nr_buffers; i++)
+ brelse(dir->bh_fplus[i]);
+
+ if (&dir->bh[0] != dir->bh_fplus)
+ kfree(dir->bh_fplus);
+
+ dir->bh_fplus = NULL;
+ }
+
+ dir->nr_buffers = 0;
+ dir->sb = NULL;
+}
+
+const struct adfs_dir_ops adfs_fplus_dir_ops = {
+ .read = adfs_fplus_read,
+ .setpos = adfs_fplus_setpos,
+ .getnext = adfs_fplus_getnext,
+ .sync = adfs_fplus_sync,
+ .free = adfs_fplus_free
+};
diff --git a/fs/adfs/dir_fplus.h b/fs/adfs/dir_fplus.h
new file mode 100644
index 000000000..b55aa41a6
--- /dev/null
+++ b/fs/adfs/dir_fplus.h
@@ -0,0 +1,45 @@
+/*
+ * linux/fs/adfs/dir_fplus.h
+ *
+ * Copyright (C) 1999 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Structures of directories on the F+ format disk
+ */
+
+#define ADFS_FPLUS_NAME_LEN 255
+
+#define BIGDIRSTARTNAME ('S' | 'B' << 8 | 'P' << 16 | 'r' << 24)
+#define BIGDIRENDNAME ('o' | 'v' << 8 | 'e' << 16 | 'n' << 24)
+
+struct adfs_bigdirheader {
+ __u8 startmasseq;
+ __u8 bigdirversion[3];
+ __le32 bigdirstartname;
+ __le32 bigdirnamelen;
+ __le32 bigdirsize;
+ __le32 bigdirentries;
+ __le32 bigdirnamesize;
+ __le32 bigdirparent;
+ char bigdirname[1];
+};
+
+struct adfs_bigdirentry {
+ __le32 bigdirload;
+ __le32 bigdirexec;
+ __le32 bigdirlen;
+ __le32 bigdirindaddr;
+ __le32 bigdirattr;
+ __le32 bigdirobnamelen;
+ __le32 bigdirobnameptr;
+};
+
+struct adfs_bigdirtail {
+ __le32 bigdirendname;
+ __u8 bigdirendmasseq;
+ __u8 reserved[2];
+ __u8 bigdircheckbyte;
+};
diff --git a/fs/adfs/file.c b/fs/adfs/file.c
new file mode 100644
index 000000000..754afb14a
--- /dev/null
+++ b/fs/adfs/file.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/adfs/file.c
+ *
+ * Copyright (C) 1997-1999 Russell King
+ * from:
+ *
+ * linux/fs/ext2/file.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ * from
+ *
+ * linux/fs/minix/file.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * adfs regular file handling primitives
+ */
+#include "adfs.h"
+
+const struct file_operations adfs_file_operations = {
+ .llseek = generic_file_llseek,
+ .read_iter = generic_file_read_iter,
+ .mmap = generic_file_mmap,
+ .fsync = generic_file_fsync,
+ .write_iter = generic_file_write_iter,
+ .splice_read = generic_file_splice_read,
+};
+
+const struct inode_operations adfs_file_inode_operations = {
+ .setattr = adfs_notify_change,
+};
diff --git a/fs/adfs/inode.c b/fs/adfs/inode.c
new file mode 100644
index 000000000..66621e96f
--- /dev/null
+++ b/fs/adfs/inode.c
@@ -0,0 +1,371 @@
+/*
+ * linux/fs/adfs/inode.c
+ *
+ * Copyright (C) 1997-1999 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/buffer_head.h>
+#include <linux/writeback.h>
+#include "adfs.h"
+
+/*
+ * Lookup/Create a block at offset 'block' into 'inode'. We currently do
+ * not support creation of new blocks, so we return -EIO for this case.
+ */
+static int
+adfs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh,
+ int create)
+{
+ if (!create) {
+ if (block >= inode->i_blocks)
+ goto abort_toobig;
+
+ block = __adfs_block_map(inode->i_sb, inode->i_ino, block);
+ if (block)
+ map_bh(bh, inode->i_sb, block);
+ return 0;
+ }
+ /* don't support allocation of blocks yet */
+ return -EIO;
+
+abort_toobig:
+ return 0;
+}
+
+static int adfs_writepage(struct page *page, struct writeback_control *wbc)
+{
+ return block_write_full_page(page, adfs_get_block, wbc);
+}
+
+static int adfs_readpage(struct file *file, struct page *page)
+{
+ return block_read_full_page(page, adfs_get_block);
+}
+
+static void adfs_write_failed(struct address_space *mapping, loff_t to)
+{
+ struct inode *inode = mapping->host;
+
+ if (to > inode->i_size)
+ truncate_pagecache(inode, inode->i_size);
+}
+
+static int adfs_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
+{
+ int ret;
+
+ *pagep = NULL;
+ ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
+ adfs_get_block,
+ &ADFS_I(mapping->host)->mmu_private);
+ if (unlikely(ret))
+ adfs_write_failed(mapping, pos + len);
+
+ return ret;
+}
+
+static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
+{
+ return generic_block_bmap(mapping, block, adfs_get_block);
+}
+
+static const struct address_space_operations adfs_aops = {
+ .readpage = adfs_readpage,
+ .writepage = adfs_writepage,
+ .write_begin = adfs_write_begin,
+ .write_end = generic_write_end,
+ .bmap = _adfs_bmap
+};
+
+/*
+ * Convert ADFS attributes and filetype to Linux permission.
+ */
+static umode_t
+adfs_atts2mode(struct super_block *sb, struct inode *inode)
+{
+ unsigned int attr = ADFS_I(inode)->attr;
+ umode_t mode, rmask;
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+
+ if (attr & ADFS_NDA_DIRECTORY) {
+ mode = S_IRUGO & asb->s_owner_mask;
+ return S_IFDIR | S_IXUGO | mode;
+ }
+
+ switch (ADFS_I(inode)->filetype) {
+ case 0xfc0: /* LinkFS */
+ return S_IFLNK|S_IRWXUGO;
+
+ case 0xfe6: /* UnixExec */
+ rmask = S_IRUGO | S_IXUGO;
+ break;
+
+ default:
+ rmask = S_IRUGO;
+ }
+
+ mode = S_IFREG;
+
+ if (attr & ADFS_NDA_OWNER_READ)
+ mode |= rmask & asb->s_owner_mask;
+
+ if (attr & ADFS_NDA_OWNER_WRITE)
+ mode |= S_IWUGO & asb->s_owner_mask;
+
+ if (attr & ADFS_NDA_PUBLIC_READ)
+ mode |= rmask & asb->s_other_mask;
+
+ if (attr & ADFS_NDA_PUBLIC_WRITE)
+ mode |= S_IWUGO & asb->s_other_mask;
+ return mode;
+}
+
+/*
+ * Convert Linux permission to ADFS attribute. We try to do the reverse
+ * of atts2mode, but there is not a 1:1 translation.
+ */
+static int
+adfs_mode2atts(struct super_block *sb, struct inode *inode)
+{
+ umode_t mode;
+ int attr;
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+
+ /* FIXME: should we be able to alter a link? */
+ if (S_ISLNK(inode->i_mode))
+ return ADFS_I(inode)->attr;
+
+ if (S_ISDIR(inode->i_mode))
+ attr = ADFS_NDA_DIRECTORY;
+ else
+ attr = 0;
+
+ mode = inode->i_mode & asb->s_owner_mask;
+ if (mode & S_IRUGO)
+ attr |= ADFS_NDA_OWNER_READ;
+ if (mode & S_IWUGO)
+ attr |= ADFS_NDA_OWNER_WRITE;
+
+ mode = inode->i_mode & asb->s_other_mask;
+ mode &= ~asb->s_owner_mask;
+ if (mode & S_IRUGO)
+ attr |= ADFS_NDA_PUBLIC_READ;
+ if (mode & S_IWUGO)
+ attr |= ADFS_NDA_PUBLIC_WRITE;
+
+ return attr;
+}
+
+/*
+ * Convert an ADFS time to Unix time. ADFS has a 40-bit centi-second time
+ * referenced to 1 Jan 1900 (til 2248) so we need to discard 2208988800 seconds
+ * of time to convert from RISC OS epoch to Unix epoch.
+ */
+static void
+adfs_adfs2unix_time(struct timespec64 *tv, struct inode *inode)
+{
+ unsigned int high, low;
+ /* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since
+ * 01 Jan 1900 00:00:00 (RISC OS epoch)
+ */
+ static const s64 nsec_unix_epoch_diff_risc_os_epoch =
+ 2208988800000000000LL;
+ s64 nsec;
+
+ if (ADFS_I(inode)->stamped == 0)
+ goto cur_time;
+
+ high = ADFS_I(inode)->loadaddr & 0xFF; /* top 8 bits of timestamp */
+ low = ADFS_I(inode)->execaddr; /* bottom 32 bits of timestamp */
+
+ /* convert 40-bit centi-seconds to 32-bit seconds
+ * going via nanoseconds to retain precision
+ */
+ nsec = (((s64) high << 32) | (s64) low) * 10000000; /* cs to ns */
+
+ /* Files dated pre 01 Jan 1970 00:00:00. */
+ if (nsec < nsec_unix_epoch_diff_risc_os_epoch)
+ goto too_early;
+
+ /* convert from RISC OS to Unix epoch */
+ nsec -= nsec_unix_epoch_diff_risc_os_epoch;
+
+ *tv = ns_to_timespec64(nsec);
+ return;
+
+ cur_time:
+ *tv = current_time(inode);
+ return;
+
+ too_early:
+ tv->tv_sec = tv->tv_nsec = 0;
+ return;
+}
+
+/*
+ * Convert an Unix time to ADFS time. We only do this if the entry has a
+ * time/date stamp already.
+ */
+static void
+adfs_unix2adfs_time(struct inode *inode, unsigned int secs)
+{
+ unsigned int high, low;
+
+ if (ADFS_I(inode)->stamped) {
+ /* convert 32-bit seconds to 40-bit centi-seconds */
+ low = (secs & 255) * 100;
+ high = (secs / 256) * 100 + (low >> 8) + 0x336e996a;
+
+ ADFS_I(inode)->loadaddr = (high >> 24) |
+ (ADFS_I(inode)->loadaddr & ~0xff);
+ ADFS_I(inode)->execaddr = (low & 255) | (high << 8);
+ }
+}
+
+/*
+ * Fill in the inode information from the object information.
+ *
+ * Note that this is an inode-less filesystem, so we can't use the inode
+ * number to reference the metadata on the media. Instead, we use the
+ * inode number to hold the object ID, which in turn will tell us where
+ * the data is held. We also save the parent object ID, and with these
+ * two, we can locate the metadata.
+ *
+ * This does mean that we rely on an objects parent remaining the same at
+ * all times - we cannot cope with a cross-directory rename (yet).
+ */
+struct inode *
+adfs_iget(struct super_block *sb, struct object_info *obj)
+{
+ struct inode *inode;
+
+ inode = new_inode(sb);
+ if (!inode)
+ goto out;
+
+ inode->i_uid = ADFS_SB(sb)->s_uid;
+ inode->i_gid = ADFS_SB(sb)->s_gid;
+ inode->i_ino = obj->file_id;
+ inode->i_size = obj->size;
+ set_nlink(inode, 2);
+ inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >>
+ sb->s_blocksize_bits;
+
+ /*
+ * we need to save the parent directory ID so that
+ * write_inode can update the directory information
+ * for this file. This will need special handling
+ * for cross-directory renames.
+ */
+ ADFS_I(inode)->parent_id = obj->parent_id;
+ ADFS_I(inode)->loadaddr = obj->loadaddr;
+ ADFS_I(inode)->execaddr = obj->execaddr;
+ ADFS_I(inode)->attr = obj->attr;
+ ADFS_I(inode)->filetype = obj->filetype;
+ ADFS_I(inode)->stamped = ((obj->loadaddr & 0xfff00000) == 0xfff00000);
+
+ inode->i_mode = adfs_atts2mode(sb, inode);
+ adfs_adfs2unix_time(&inode->i_mtime, inode);
+ inode->i_atime = inode->i_mtime;
+ inode->i_ctime = inode->i_mtime;
+
+ if (S_ISDIR(inode->i_mode)) {
+ inode->i_op = &adfs_dir_inode_operations;
+ inode->i_fop = &adfs_dir_operations;
+ } else if (S_ISREG(inode->i_mode)) {
+ inode->i_op = &adfs_file_inode_operations;
+ inode->i_fop = &adfs_file_operations;
+ inode->i_mapping->a_ops = &adfs_aops;
+ ADFS_I(inode)->mmu_private = inode->i_size;
+ }
+
+ inode_fake_hash(inode);
+
+out:
+ return inode;
+}
+
+/*
+ * Validate and convert a changed access mode/time to their ADFS equivalents.
+ * adfs_write_inode will actually write the information back to the directory
+ * later.
+ */
+int
+adfs_notify_change(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = d_inode(dentry);
+ struct super_block *sb = inode->i_sb;
+ unsigned int ia_valid = attr->ia_valid;
+ int error;
+
+ error = setattr_prepare(dentry, attr);
+
+ /*
+ * we can't change the UID or GID of any file -
+ * we have a global UID/GID in the superblock
+ */
+ if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, ADFS_SB(sb)->s_uid)) ||
+ (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, ADFS_SB(sb)->s_gid)))
+ error = -EPERM;
+
+ if (error)
+ goto out;
+
+ /* XXX: this is missing some actual on-disk truncation.. */
+ if (ia_valid & ATTR_SIZE)
+ truncate_setsize(inode, attr->ia_size);
+
+ if (ia_valid & ATTR_MTIME) {
+ inode->i_mtime = attr->ia_mtime;
+ adfs_unix2adfs_time(inode, attr->ia_mtime.tv_sec);
+ }
+ /*
+ * FIXME: should we make these == to i_mtime since we don't
+ * have the ability to represent them in our filesystem?
+ */
+ if (ia_valid & ATTR_ATIME)
+ inode->i_atime = attr->ia_atime;
+ if (ia_valid & ATTR_CTIME)
+ inode->i_ctime = attr->ia_ctime;
+ if (ia_valid & ATTR_MODE) {
+ ADFS_I(inode)->attr = adfs_mode2atts(sb, inode);
+ inode->i_mode = adfs_atts2mode(sb, inode);
+ }
+
+ /*
+ * FIXME: should we be marking this inode dirty even if
+ * we don't have any metadata to write back?
+ */
+ if (ia_valid & (ATTR_SIZE | ATTR_MTIME | ATTR_MODE))
+ mark_inode_dirty(inode);
+out:
+ return error;
+}
+
+/*
+ * write an existing inode back to the directory, and therefore the disk.
+ * The adfs-specific inode data has already been updated by
+ * adfs_notify_change()
+ */
+int adfs_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+ struct super_block *sb = inode->i_sb;
+ struct object_info obj;
+ int ret;
+
+ obj.file_id = inode->i_ino;
+ obj.name_len = 0;
+ obj.parent_id = ADFS_I(inode)->parent_id;
+ obj.loadaddr = ADFS_I(inode)->loadaddr;
+ obj.execaddr = ADFS_I(inode)->execaddr;
+ obj.attr = ADFS_I(inode)->attr;
+ obj.size = inode->i_size;
+
+ ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
+ return ret;
+}
diff --git a/fs/adfs/map.c b/fs/adfs/map.c
new file mode 100644
index 000000000..6935f0520
--- /dev/null
+++ b/fs/adfs/map.c
@@ -0,0 +1,290 @@
+/*
+ * linux/fs/adfs/map.c
+ *
+ * Copyright (C) 1997-2002 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/buffer_head.h>
+#include <asm/unaligned.h>
+#include "adfs.h"
+
+/*
+ * The ADFS map is basically a set of sectors. Each sector is called a
+ * zone which contains a bitstream made up of variable sized fragments.
+ * Each bit refers to a set of bytes in the filesystem, defined by
+ * log2bpmb. This may be larger or smaller than the sector size, but
+ * the overall size it describes will always be a round number of
+ * sectors. A fragment id is always idlen bits long.
+ *
+ * < idlen > < n > <1>
+ * +---------+-------//---------+---+
+ * | frag id | 0000....000000 | 1 |
+ * +---------+-------//---------+---+
+ *
+ * The physical disk space used by a fragment is taken from the start of
+ * the fragment id up to and including the '1' bit - ie, idlen + n + 1
+ * bits.
+ *
+ * A fragment id can be repeated multiple times in the whole map for
+ * large or fragmented files. The first map zone a fragment starts in
+ * is given by fragment id / ids_per_zone - this allows objects to start
+ * from any zone on the disk.
+ *
+ * Free space is described by a linked list of fragments. Each free
+ * fragment describes free space in the same way as the other fragments,
+ * however, the frag id specifies an offset (in map bits) from the end
+ * of this fragment to the start of the next free fragment.
+ *
+ * Objects stored on the disk are allocated object ids (we use these as
+ * our inode numbers.) Object ids contain a fragment id and an optional
+ * offset. This allows a directory fragment to contain small files
+ * associated with that directory.
+ */
+
+/*
+ * For the future...
+ */
+static DEFINE_RWLOCK(adfs_map_lock);
+
+/*
+ * This is fun. We need to load up to 19 bits from the map at an
+ * arbitrary bit alignment. (We're limited to 19 bits by F+ version 2).
+ */
+#define GET_FRAG_ID(_map,_start,_idmask) \
+ ({ \
+ unsigned char *_m = _map + (_start >> 3); \
+ u32 _frag = get_unaligned_le32(_m); \
+ _frag >>= (_start & 7); \
+ _frag & _idmask; \
+ })
+
+/*
+ * return the map bit offset of the fragment frag_id in the zone dm.
+ * Note that the loop is optimised for best asm code - look at the
+ * output of:
+ * gcc -D__KERNEL__ -O2 -I../../include -o - -S map.c
+ */
+static int
+lookup_zone(const struct adfs_discmap *dm, const unsigned int idlen,
+ const unsigned int frag_id, unsigned int *offset)
+{
+ const unsigned int mapsize = dm->dm_endbit;
+ const u32 idmask = (1 << idlen) - 1;
+ unsigned char *map = dm->dm_bh->b_data + 4;
+ unsigned int start = dm->dm_startbit;
+ unsigned int mapptr;
+ u32 frag;
+
+ do {
+ frag = GET_FRAG_ID(map, start, idmask);
+ mapptr = start + idlen;
+
+ /*
+ * find end of fragment
+ */
+ {
+ __le32 *_map = (__le32 *)map;
+ u32 v = le32_to_cpu(_map[mapptr >> 5]) >> (mapptr & 31);
+ while (v == 0) {
+ mapptr = (mapptr & ~31) + 32;
+ if (mapptr >= mapsize)
+ goto error;
+ v = le32_to_cpu(_map[mapptr >> 5]);
+ }
+
+ mapptr += 1 + ffz(~v);
+ }
+
+ if (frag == frag_id)
+ goto found;
+again:
+ start = mapptr;
+ } while (mapptr < mapsize);
+ return -1;
+
+error:
+ printk(KERN_ERR "adfs: oversized fragment 0x%x at 0x%x-0x%x\n",
+ frag, start, mapptr);
+ return -1;
+
+found:
+ {
+ int length = mapptr - start;
+ if (*offset >= length) {
+ *offset -= length;
+ goto again;
+ }
+ }
+ return start + *offset;
+}
+
+/*
+ * Scan the free space map, for this zone, calculating the total
+ * number of map bits in each free space fragment.
+ *
+ * Note: idmask is limited to 15 bits [3.2]
+ */
+static unsigned int
+scan_free_map(struct adfs_sb_info *asb, struct adfs_discmap *dm)
+{
+ const unsigned int mapsize = dm->dm_endbit + 32;
+ const unsigned int idlen = asb->s_idlen;
+ const unsigned int frag_idlen = idlen <= 15 ? idlen : 15;
+ const u32 idmask = (1 << frag_idlen) - 1;
+ unsigned char *map = dm->dm_bh->b_data;
+ unsigned int start = 8, mapptr;
+ u32 frag;
+ unsigned long total = 0;
+
+ /*
+ * get fragment id
+ */
+ frag = GET_FRAG_ID(map, start, idmask);
+
+ /*
+ * If the freelink is null, then no free fragments
+ * exist in this zone.
+ */
+ if (frag == 0)
+ return 0;
+
+ do {
+ start += frag;
+
+ /*
+ * get fragment id
+ */
+ frag = GET_FRAG_ID(map, start, idmask);
+ mapptr = start + idlen;
+
+ /*
+ * find end of fragment
+ */
+ {
+ __le32 *_map = (__le32 *)map;
+ u32 v = le32_to_cpu(_map[mapptr >> 5]) >> (mapptr & 31);
+ while (v == 0) {
+ mapptr = (mapptr & ~31) + 32;
+ if (mapptr >= mapsize)
+ goto error;
+ v = le32_to_cpu(_map[mapptr >> 5]);
+ }
+
+ mapptr += 1 + ffz(~v);
+ }
+
+ total += mapptr - start;
+ } while (frag >= idlen + 1);
+
+ if (frag != 0)
+ printk(KERN_ERR "adfs: undersized free fragment\n");
+
+ return total;
+error:
+ printk(KERN_ERR "adfs: oversized free fragment\n");
+ return 0;
+}
+
+static int
+scan_map(struct adfs_sb_info *asb, unsigned int zone,
+ const unsigned int frag_id, unsigned int mapoff)
+{
+ const unsigned int idlen = asb->s_idlen;
+ struct adfs_discmap *dm, *dm_end;
+ int result;
+
+ dm = asb->s_map + zone;
+ zone = asb->s_map_size;
+ dm_end = asb->s_map + zone;
+
+ do {
+ result = lookup_zone(dm, idlen, frag_id, &mapoff);
+
+ if (result != -1)
+ goto found;
+
+ dm ++;
+ if (dm == dm_end)
+ dm = asb->s_map;
+ } while (--zone > 0);
+
+ return -1;
+found:
+ result -= dm->dm_startbit;
+ result += dm->dm_startblk;
+
+ return result;
+}
+
+/*
+ * calculate the amount of free blocks in the map.
+ *
+ * n=1
+ * total_free = E(free_in_zone_n)
+ * nzones
+ */
+unsigned int
+adfs_map_free(struct super_block *sb)
+{
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+ struct adfs_discmap *dm;
+ unsigned int total = 0;
+ unsigned int zone;
+
+ dm = asb->s_map;
+ zone = asb->s_map_size;
+
+ do {
+ total += scan_free_map(asb, dm++);
+ } while (--zone > 0);
+
+ return signed_asl(total, asb->s_map2blk);
+}
+
+int
+adfs_map_lookup(struct super_block *sb, unsigned int frag_id,
+ unsigned int offset)
+{
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+ unsigned int zone, mapoff;
+ int result;
+
+ /*
+ * map & root fragment is special - it starts in the center of the
+ * disk. The other fragments start at zone (frag / ids_per_zone)
+ */
+ if (frag_id == ADFS_ROOT_FRAG)
+ zone = asb->s_map_size >> 1;
+ else
+ zone = frag_id / asb->s_ids_per_zone;
+
+ if (zone >= asb->s_map_size)
+ goto bad_fragment;
+
+ /* Convert sector offset to map offset */
+ mapoff = signed_asl(offset, -asb->s_map2blk);
+
+ read_lock(&adfs_map_lock);
+ result = scan_map(asb, zone, frag_id, mapoff);
+ read_unlock(&adfs_map_lock);
+
+ if (result > 0) {
+ unsigned int secoff;
+
+ /* Calculate sector offset into map block */
+ secoff = offset - signed_asl(mapoff, asb->s_map2blk);
+ return secoff + signed_asl(result, asb->s_map2blk);
+ }
+
+ adfs_error(sb, "fragment 0x%04x at offset %d not found in map",
+ frag_id, offset);
+ return 0;
+
+bad_fragment:
+ adfs_error(sb, "invalid fragment 0x%04x (zone = %d, max = %d)",
+ frag_id, zone, asb->s_map_size);
+ return 0;
+}
diff --git a/fs/adfs/super.c b/fs/adfs/super.c
new file mode 100644
index 000000000..4dc15b263
--- /dev/null
+++ b/fs/adfs/super.c
@@ -0,0 +1,566 @@
+/*
+ * linux/fs/adfs/super.c
+ *
+ * Copyright (C) 1997-1999 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/buffer_head.h>
+#include <linux/parser.h>
+#include <linux/mount.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/statfs.h>
+#include <linux/user_namespace.h>
+#include "adfs.h"
+#include "dir_f.h"
+#include "dir_fplus.h"
+
+#define ADFS_DEFAULT_OWNER_MASK S_IRWXU
+#define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO)
+
+void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...)
+{
+ char error_buf[128];
+ va_list args;
+
+ va_start(args, fmt);
+ vsnprintf(error_buf, sizeof(error_buf), fmt, args);
+ va_end(args);
+
+ printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n",
+ sb->s_id, function ? ": " : "",
+ function ? function : "", error_buf);
+}
+
+static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
+{
+ int i;
+
+ /* sector size must be 256, 512 or 1024 bytes */
+ if (dr->log2secsize != 8 &&
+ dr->log2secsize != 9 &&
+ dr->log2secsize != 10)
+ return 1;
+
+ /* idlen must be at least log2secsize + 3 */
+ if (dr->idlen < dr->log2secsize + 3)
+ return 1;
+
+ /* we cannot have such a large disc that we
+ * are unable to represent sector offsets in
+ * 32 bits. This works out at 2.0 TB.
+ */
+ if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
+ return 1;
+
+ /* idlen must be no greater than 19 v2 [1.0] */
+ if (dr->idlen > 19)
+ return 1;
+
+ /* reserved bytes should be zero */
+ for (i = 0; i < sizeof(dr->unused52); i++)
+ if (dr->unused52[i] != 0)
+ return 1;
+
+ return 0;
+}
+
+static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map)
+{
+ unsigned int v0, v1, v2, v3;
+ int i;
+
+ v0 = v1 = v2 = v3 = 0;
+ for (i = sb->s_blocksize - 4; i; i -= 4) {
+ v0 += map[i] + (v3 >> 8);
+ v3 &= 0xff;
+ v1 += map[i + 1] + (v0 >> 8);
+ v0 &= 0xff;
+ v2 += map[i + 2] + (v1 >> 8);
+ v1 &= 0xff;
+ v3 += map[i + 3] + (v2 >> 8);
+ v2 &= 0xff;
+ }
+ v0 += v3 >> 8;
+ v1 += map[1] + (v0 >> 8);
+ v2 += map[2] + (v1 >> 8);
+ v3 += map[3] + (v2 >> 8);
+
+ return v0 ^ v1 ^ v2 ^ v3;
+}
+
+static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm)
+{
+ unsigned char crosscheck = 0, zonecheck = 1;
+ int i;
+
+ for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) {
+ unsigned char *map;
+
+ map = dm[i].dm_bh->b_data;
+
+ if (adfs_calczonecheck(sb, map) != map[0]) {
+ adfs_error(sb, "zone %d fails zonecheck", i);
+ zonecheck = 0;
+ }
+ crosscheck ^= map[3];
+ }
+ if (crosscheck != 0xff)
+ adfs_error(sb, "crosscheck != 0xff");
+ return crosscheck == 0xff && zonecheck;
+}
+
+static void adfs_put_super(struct super_block *sb)
+{
+ int i;
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+
+ for (i = 0; i < asb->s_map_size; i++)
+ brelse(asb->s_map[i].dm_bh);
+ kfree(asb->s_map);
+ kfree_rcu(asb, rcu);
+}
+
+static int adfs_show_options(struct seq_file *seq, struct dentry *root)
+{
+ struct adfs_sb_info *asb = ADFS_SB(root->d_sb);
+
+ if (!uid_eq(asb->s_uid, GLOBAL_ROOT_UID))
+ seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, asb->s_uid));
+ if (!gid_eq(asb->s_gid, GLOBAL_ROOT_GID))
+ seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, asb->s_gid));
+ if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK)
+ seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
+ if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
+ seq_printf(seq, ",othmask=%o", asb->s_other_mask);
+ if (asb->s_ftsuffix != 0)
+ seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);
+
+ return 0;
+}
+
+enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
+
+static const match_table_t tokens = {
+ {Opt_uid, "uid=%u"},
+ {Opt_gid, "gid=%u"},
+ {Opt_ownmask, "ownmask=%o"},
+ {Opt_othmask, "othmask=%o"},
+ {Opt_ftsuffix, "ftsuffix=%u"},
+ {Opt_err, NULL}
+};
+
+static int parse_options(struct super_block *sb, char *options)
+{
+ char *p;
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+ int option;
+
+ if (!options)
+ return 0;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ substring_t args[MAX_OPT_ARGS];
+ int token;
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_uid:
+ if (match_int(args, &option))
+ return -EINVAL;
+ asb->s_uid = make_kuid(current_user_ns(), option);
+ if (!uid_valid(asb->s_uid))
+ return -EINVAL;
+ break;
+ case Opt_gid:
+ if (match_int(args, &option))
+ return -EINVAL;
+ asb->s_gid = make_kgid(current_user_ns(), option);
+ if (!gid_valid(asb->s_gid))
+ return -EINVAL;
+ break;
+ case Opt_ownmask:
+ if (match_octal(args, &option))
+ return -EINVAL;
+ asb->s_owner_mask = option;
+ break;
+ case Opt_othmask:
+ if (match_octal(args, &option))
+ return -EINVAL;
+ asb->s_other_mask = option;
+ break;
+ case Opt_ftsuffix:
+ if (match_int(args, &option))
+ return -EINVAL;
+ asb->s_ftsuffix = option;
+ break;
+ default:
+ printk("ADFS-fs: unrecognised mount option \"%s\" "
+ "or missing value\n", p);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int adfs_remount(struct super_block *sb, int *flags, char *data)
+{
+ sync_filesystem(sb);
+ *flags |= SB_NODIRATIME;
+ return parse_options(sb, data);
+}
+
+static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ struct adfs_sb_info *sbi = ADFS_SB(sb);
+ u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+
+ buf->f_type = ADFS_SUPER_MAGIC;
+ buf->f_namelen = sbi->s_namelen;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = sbi->s_size;
+ buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size;
+ buf->f_bavail =
+ buf->f_bfree = adfs_map_free(sb);
+ buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
+ buf->f_fsid.val[0] = (u32)id;
+ buf->f_fsid.val[1] = (u32)(id >> 32);
+
+ return 0;
+}
+
+static struct kmem_cache *adfs_inode_cachep;
+
+static struct inode *adfs_alloc_inode(struct super_block *sb)
+{
+ struct adfs_inode_info *ei;
+ ei = kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+static void adfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
+}
+
+static void adfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, adfs_i_callback);
+}
+
+static void init_once(void *foo)
+{
+ struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
+
+ inode_init_once(&ei->vfs_inode);
+}
+
+static int __init init_inodecache(void)
+{
+ adfs_inode_cachep = kmem_cache_create("adfs_inode_cache",
+ sizeof(struct adfs_inode_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+ init_once);
+ if (adfs_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(adfs_inode_cachep);
+}
+
+static const struct super_operations adfs_sops = {
+ .alloc_inode = adfs_alloc_inode,
+ .destroy_inode = adfs_destroy_inode,
+ .drop_inode = generic_delete_inode,
+ .write_inode = adfs_write_inode,
+ .put_super = adfs_put_super,
+ .statfs = adfs_statfs,
+ .remount_fs = adfs_remount,
+ .show_options = adfs_show_options,
+};
+
+static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
+{
+ struct adfs_discmap *dm;
+ unsigned int map_addr, zone_size, nzones;
+ int i, zone;
+ struct adfs_sb_info *asb = ADFS_SB(sb);
+
+ nzones = asb->s_map_size;
+ zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
+ map_addr = (nzones >> 1) * zone_size -
+ ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
+ map_addr = signed_asl(map_addr, asb->s_map2blk);
+
+ asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
+
+ dm = kmalloc_array(nzones, sizeof(*dm), GFP_KERNEL);
+ if (dm == NULL) {
+ adfs_error(sb, "not enough memory");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ for (zone = 0; zone < nzones; zone++, map_addr++) {
+ dm[zone].dm_startbit = 0;
+ dm[zone].dm_endbit = zone_size;
+ dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
+ dm[zone].dm_bh = sb_bread(sb, map_addr);
+
+ if (!dm[zone].dm_bh) {
+ adfs_error(sb, "unable to read map");
+ goto error_free;
+ }
+ }
+
+ /* adjust the limits for the first and last map zones */
+ i = zone - 1;
+ dm[0].dm_startblk = 0;
+ dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
+ dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
+ (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
+ (ADFS_DR_SIZE_BITS - i * zone_size);
+
+ if (adfs_checkmap(sb, dm))
+ return dm;
+
+ adfs_error(sb, "map corrupted");
+
+error_free:
+ while (--zone >= 0)
+ brelse(dm[zone].dm_bh);
+
+ kfree(dm);
+ return ERR_PTR(-EIO);
+}
+
+static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
+{
+ unsigned long discsize;
+
+ discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
+ discsize |= le32_to_cpu(dr->disc_size) >> block_bits;
+
+ return discsize;
+}
+
+static int adfs_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct adfs_discrecord *dr;
+ struct buffer_head *bh;
+ struct object_info root_obj;
+ unsigned char *b_data;
+ unsigned int blocksize;
+ struct adfs_sb_info *asb;
+ struct inode *root;
+ int ret = -EINVAL;
+
+ sb->s_flags |= SB_NODIRATIME;
+
+ asb = kzalloc(sizeof(*asb), GFP_KERNEL);
+ if (!asb)
+ return -ENOMEM;
+ sb->s_fs_info = asb;
+
+ /* set default options */
+ asb->s_uid = GLOBAL_ROOT_UID;
+ asb->s_gid = GLOBAL_ROOT_GID;
+ asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
+ asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
+ asb->s_ftsuffix = 0;
+
+ if (parse_options(sb, data))
+ goto error;
+
+ sb_set_blocksize(sb, BLOCK_SIZE);
+ if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
+ adfs_error(sb, "unable to read superblock");
+ ret = -EIO;
+ goto error;
+ }
+
+ b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
+
+ if (adfs_checkbblk(b_data)) {
+ if (!silent)
+ printk("VFS: Can't find an adfs filesystem on dev "
+ "%s.\n", sb->s_id);
+ ret = -EINVAL;
+ goto error_free_bh;
+ }
+
+ dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
+
+ /*
+ * Do some sanity checks on the ADFS disc record
+ */
+ if (adfs_checkdiscrecord(dr)) {
+ if (!silent)
+ printk("VPS: Can't find an adfs filesystem on dev "
+ "%s.\n", sb->s_id);
+ ret = -EINVAL;
+ goto error_free_bh;
+ }
+
+ blocksize = 1 << dr->log2secsize;
+ brelse(bh);
+
+ if (sb_set_blocksize(sb, blocksize)) {
+ bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
+ if (!bh) {
+ adfs_error(sb, "couldn't read superblock on "
+ "2nd try.");
+ ret = -EIO;
+ goto error;
+ }
+ b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
+ if (adfs_checkbblk(b_data)) {
+ adfs_error(sb, "disc record mismatch, very weird!");
+ ret = -EINVAL;
+ goto error_free_bh;
+ }
+ dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
+ } else {
+ if (!silent)
+ printk(KERN_ERR "VFS: Unsupported blocksize on dev "
+ "%s.\n", sb->s_id);
+ ret = -EINVAL;
+ goto error;
+ }
+
+ /*
+ * blocksize on this device should now be set to the ADFS log2secsize
+ */
+
+ sb->s_magic = ADFS_SUPER_MAGIC;
+ asb->s_idlen = dr->idlen;
+ asb->s_map_size = dr->nzones | (dr->nzones_high << 8);
+ asb->s_map2blk = dr->log2bpmb - dr->log2secsize;
+ asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits);
+ asb->s_version = dr->format_version;
+ asb->s_log2sharesize = dr->log2sharesize;
+
+ asb->s_map = adfs_read_map(sb, dr);
+ if (IS_ERR(asb->s_map)) {
+ ret = PTR_ERR(asb->s_map);
+ goto error_free_bh;
+ }
+
+ brelse(bh);
+
+ /*
+ * set up enough so that we can read an inode
+ */
+ sb->s_op = &adfs_sops;
+
+ dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
+
+ root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
+ root_obj.name_len = 0;
+ /* Set root object date as 01 Jan 1987 00:00:00 */
+ root_obj.loadaddr = 0xfff0003f;
+ root_obj.execaddr = 0xec22c000;
+ root_obj.size = ADFS_NEWDIR_SIZE;
+ root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
+ ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
+ root_obj.filetype = -1;
+
+ /*
+ * If this is a F+ disk with variable length directories,
+ * get the root_size from the disc record.
+ */
+ if (asb->s_version) {
+ root_obj.size = le32_to_cpu(dr->root_size);
+ asb->s_dir = &adfs_fplus_dir_ops;
+ asb->s_namelen = ADFS_FPLUS_NAME_LEN;
+ } else {
+ asb->s_dir = &adfs_f_dir_ops;
+ asb->s_namelen = ADFS_F_NAME_LEN;
+ }
+ /*
+ * ,xyz hex filetype suffix may be added by driver
+ * to files that have valid RISC OS filetype
+ */
+ if (asb->s_ftsuffix)
+ asb->s_namelen += 4;
+
+ sb->s_d_op = &adfs_dentry_operations;
+ root = adfs_iget(sb, &root_obj);
+ sb->s_root = d_make_root(root);
+ if (!sb->s_root) {
+ int i;
+ for (i = 0; i < asb->s_map_size; i++)
+ brelse(asb->s_map[i].dm_bh);
+ kfree(asb->s_map);
+ adfs_error(sb, "get root inode failed\n");
+ ret = -EIO;
+ goto error;
+ }
+ return 0;
+
+error_free_bh:
+ brelse(bh);
+error:
+ sb->s_fs_info = NULL;
+ kfree(asb);
+ return ret;
+}
+
+static struct dentry *adfs_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
+}
+
+static struct file_system_type adfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "adfs",
+ .mount = adfs_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("adfs");
+
+static int __init init_adfs_fs(void)
+{
+ int err = init_inodecache();
+ if (err)
+ goto out1;
+ err = register_filesystem(&adfs_fs_type);
+ if (err)
+ goto out;
+ return 0;
+out:
+ destroy_inodecache();
+out1:
+ return err;
+}
+
+static void __exit exit_adfs_fs(void)
+{
+ unregister_filesystem(&adfs_fs_type);
+ destroy_inodecache();
+}
+
+module_init(init_adfs_fs)
+module_exit(exit_adfs_fs)
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 10:21:17 +0000