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![Christoph Hellwig](/assets/img/avatar_default.png)
Move the struct block_device definition together with most of the block layer definitions, as it has nothing to do with the rest of fs.h. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
1029 lines
26 KiB
C
1029 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/fs/befs/linuxvfs.c
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*
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* Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/errno.h>
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#include <linux/stat.h>
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#include <linux/nls.h>
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#include <linux/buffer_head.h>
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#include <linux/vfs.h>
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#include <linux/parser.h>
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#include <linux/namei.h>
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#include <linux/sched.h>
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#include <linux/cred.h>
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#include <linux/exportfs.h>
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#include <linux/seq_file.h>
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#include <linux/blkdev.h>
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#include "befs.h"
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#include "btree.h"
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#include "inode.h"
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#include "datastream.h"
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#include "super.h"
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#include "io.h"
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MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
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MODULE_AUTHOR("Will Dyson");
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MODULE_LICENSE("GPL");
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/* The units the vfs expects inode->i_blocks to be in */
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#define VFS_BLOCK_SIZE 512
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static int befs_readdir(struct file *, struct dir_context *);
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static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int);
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static int befs_readpage(struct file *file, struct page *page);
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static sector_t befs_bmap(struct address_space *mapping, sector_t block);
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static struct dentry *befs_lookup(struct inode *, struct dentry *,
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unsigned int);
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static struct inode *befs_iget(struct super_block *, unsigned long);
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static struct inode *befs_alloc_inode(struct super_block *sb);
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static void befs_free_inode(struct inode *inode);
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static void befs_destroy_inodecache(void);
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static int befs_symlink_readpage(struct file *, struct page *);
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static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
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char **out, int *out_len);
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static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
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char **out, int *out_len);
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static void befs_put_super(struct super_block *);
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static int befs_remount(struct super_block *, int *, char *);
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static int befs_statfs(struct dentry *, struct kstatfs *);
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static int befs_show_options(struct seq_file *, struct dentry *);
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static int parse_options(char *, struct befs_mount_options *);
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static struct dentry *befs_fh_to_dentry(struct super_block *sb,
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struct fid *fid, int fh_len, int fh_type);
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static struct dentry *befs_fh_to_parent(struct super_block *sb,
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struct fid *fid, int fh_len, int fh_type);
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static struct dentry *befs_get_parent(struct dentry *child);
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static const struct super_operations befs_sops = {
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.alloc_inode = befs_alloc_inode, /* allocate a new inode */
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.free_inode = befs_free_inode, /* deallocate an inode */
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.put_super = befs_put_super, /* uninit super */
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.statfs = befs_statfs, /* statfs */
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.remount_fs = befs_remount,
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.show_options = befs_show_options,
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};
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/* slab cache for befs_inode_info objects */
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static struct kmem_cache *befs_inode_cachep;
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static const struct file_operations befs_dir_operations = {
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.read = generic_read_dir,
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.iterate_shared = befs_readdir,
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.llseek = generic_file_llseek,
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};
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static const struct inode_operations befs_dir_inode_operations = {
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.lookup = befs_lookup,
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};
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static const struct address_space_operations befs_aops = {
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.readpage = befs_readpage,
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.bmap = befs_bmap,
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};
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static const struct address_space_operations befs_symlink_aops = {
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.readpage = befs_symlink_readpage,
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};
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static const struct export_operations befs_export_operations = {
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.fh_to_dentry = befs_fh_to_dentry,
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.fh_to_parent = befs_fh_to_parent,
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.get_parent = befs_get_parent,
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};
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/*
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* Called by generic_file_read() to read a page of data
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*
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* In turn, simply calls a generic block read function and
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* passes it the address of befs_get_block, for mapping file
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* positions to disk blocks.
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*/
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static int
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befs_readpage(struct file *file, struct page *page)
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{
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return block_read_full_page(page, befs_get_block);
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}
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static sector_t
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befs_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping, block, befs_get_block);
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}
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/*
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* Generic function to map a file position (block) to a
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* disk offset (passed back in bh_result).
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*
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* Used by many higher level functions.
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*
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* Calls befs_fblock2brun() in datastream.c to do the real work.
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*/
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static int
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befs_get_block(struct inode *inode, sector_t block,
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struct buffer_head *bh_result, int create)
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{
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struct super_block *sb = inode->i_sb;
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befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
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befs_block_run run = BAD_IADDR;
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int res;
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ulong disk_off;
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befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
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(unsigned long)inode->i_ino, (long)block);
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if (create) {
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befs_error(sb, "befs_get_block() was asked to write to "
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"block %ld in inode %lu", (long)block,
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(unsigned long)inode->i_ino);
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return -EPERM;
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}
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res = befs_fblock2brun(sb, ds, block, &run);
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if (res != BEFS_OK) {
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befs_error(sb,
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"<--- %s for inode %lu, block %ld ERROR",
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__func__, (unsigned long)inode->i_ino,
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(long)block);
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return -EFBIG;
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}
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disk_off = (ulong) iaddr2blockno(sb, &run);
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map_bh(bh_result, inode->i_sb, disk_off);
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befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu",
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__func__, (unsigned long)inode->i_ino, (long)block,
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(unsigned long)disk_off);
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return 0;
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}
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static struct dentry *
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befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
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{
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struct inode *inode;
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struct super_block *sb = dir->i_sb;
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const befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
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befs_off_t offset;
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int ret;
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int utfnamelen;
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char *utfname;
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const char *name = dentry->d_name.name;
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befs_debug(sb, "---> %s name %pd inode %ld", __func__,
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dentry, dir->i_ino);
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/* Convert to UTF-8 */
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if (BEFS_SB(sb)->nls) {
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ret =
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befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
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if (ret < 0) {
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befs_debug(sb, "<--- %s ERROR", __func__);
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return ERR_PTR(ret);
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}
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ret = befs_btree_find(sb, ds, utfname, &offset);
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kfree(utfname);
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} else {
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ret = befs_btree_find(sb, ds, name, &offset);
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}
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if (ret == BEFS_BT_NOT_FOUND) {
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befs_debug(sb, "<--- %s %pd not found", __func__, dentry);
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inode = NULL;
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} else if (ret != BEFS_OK || offset == 0) {
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befs_error(sb, "<--- %s Error", __func__);
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inode = ERR_PTR(-ENODATA);
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} else {
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inode = befs_iget(dir->i_sb, (ino_t) offset);
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}
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befs_debug(sb, "<--- %s", __func__);
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return d_splice_alias(inode, dentry);
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}
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static int
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befs_readdir(struct file *file, struct dir_context *ctx)
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{
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struct inode *inode = file_inode(file);
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struct super_block *sb = inode->i_sb;
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const befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
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befs_off_t value;
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int result;
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size_t keysize;
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char keybuf[BEFS_NAME_LEN + 1];
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befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld",
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__func__, file, inode->i_ino, ctx->pos);
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while (1) {
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result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1,
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keybuf, &keysize, &value);
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if (result == BEFS_ERR) {
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befs_debug(sb, "<--- %s ERROR", __func__);
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befs_error(sb, "IO error reading %pD (inode %lu)",
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file, inode->i_ino);
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return -EIO;
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} else if (result == BEFS_BT_END) {
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befs_debug(sb, "<--- %s END", __func__);
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return 0;
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} else if (result == BEFS_BT_EMPTY) {
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befs_debug(sb, "<--- %s Empty directory", __func__);
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return 0;
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}
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/* Convert to NLS */
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if (BEFS_SB(sb)->nls) {
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char *nlsname;
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int nlsnamelen;
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result =
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befs_utf2nls(sb, keybuf, keysize, &nlsname,
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&nlsnamelen);
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if (result < 0) {
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befs_debug(sb, "<--- %s ERROR", __func__);
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return result;
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}
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if (!dir_emit(ctx, nlsname, nlsnamelen,
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(ino_t) value, DT_UNKNOWN)) {
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kfree(nlsname);
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return 0;
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}
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kfree(nlsname);
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} else {
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if (!dir_emit(ctx, keybuf, keysize,
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(ino_t) value, DT_UNKNOWN))
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return 0;
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}
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ctx->pos++;
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}
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}
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static struct inode *
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befs_alloc_inode(struct super_block *sb)
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{
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struct befs_inode_info *bi;
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bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL);
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if (!bi)
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return NULL;
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return &bi->vfs_inode;
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}
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static void befs_free_inode(struct inode *inode)
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{
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kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
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}
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static void init_once(void *foo)
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{
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struct befs_inode_info *bi = (struct befs_inode_info *) foo;
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inode_init_once(&bi->vfs_inode);
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}
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static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
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{
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struct buffer_head *bh;
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befs_inode *raw_inode;
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struct befs_sb_info *befs_sb = BEFS_SB(sb);
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struct befs_inode_info *befs_ino;
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struct inode *inode;
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befs_debug(sb, "---> %s inode = %lu", __func__, ino);
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inode = iget_locked(sb, ino);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (!(inode->i_state & I_NEW))
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return inode;
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befs_ino = BEFS_I(inode);
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/* convert from vfs's inode number to befs's inode number */
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befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
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befs_debug(sb, " real inode number [%u, %hu, %hu]",
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befs_ino->i_inode_num.allocation_group,
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befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
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bh = sb_bread(sb, inode->i_ino);
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if (!bh) {
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befs_error(sb, "unable to read inode block - "
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"inode = %lu", inode->i_ino);
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goto unacquire_none;
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}
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raw_inode = (befs_inode *) bh->b_data;
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befs_dump_inode(sb, raw_inode);
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if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
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befs_error(sb, "Bad inode: %lu", inode->i_ino);
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goto unacquire_bh;
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}
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inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
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/*
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* set uid and gid. But since current BeOS is single user OS, so
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* you can change by "uid" or "gid" options.
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*/
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inode->i_uid = befs_sb->mount_opts.use_uid ?
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befs_sb->mount_opts.uid :
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make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid));
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inode->i_gid = befs_sb->mount_opts.use_gid ?
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befs_sb->mount_opts.gid :
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make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid));
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set_nlink(inode, 1);
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/*
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* BEFS's time is 64 bits, but current VFS is 32 bits...
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* BEFS don't have access time. Nor inode change time. VFS
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* doesn't have creation time.
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* Also, the lower 16 bits of the last_modified_time and
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* create_time are just a counter to help ensure uniqueness
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* for indexing purposes. (PFD, page 54)
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*/
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inode->i_mtime.tv_sec =
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fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
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inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
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inode->i_ctime = inode->i_mtime;
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inode->i_atime = inode->i_mtime;
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befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
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befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
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befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
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befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
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if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
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inode->i_size = 0;
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inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
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strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
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BEFS_SYMLINK_LEN);
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} else {
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int num_blks;
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befs_ino->i_data.ds =
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fsds_to_cpu(sb, &raw_inode->data.datastream);
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num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
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inode->i_blocks =
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num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
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inode->i_size = befs_ino->i_data.ds.size;
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}
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inode->i_mapping->a_ops = &befs_aops;
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if (S_ISREG(inode->i_mode)) {
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inode->i_fop = &generic_ro_fops;
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} else if (S_ISDIR(inode->i_mode)) {
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inode->i_op = &befs_dir_inode_operations;
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inode->i_fop = &befs_dir_operations;
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} else if (S_ISLNK(inode->i_mode)) {
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if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
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inode->i_op = &page_symlink_inode_operations;
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inode_nohighmem(inode);
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inode->i_mapping->a_ops = &befs_symlink_aops;
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} else {
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inode->i_link = befs_ino->i_data.symlink;
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inode->i_op = &simple_symlink_inode_operations;
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}
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} else {
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befs_error(sb, "Inode %lu is not a regular file, "
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"directory or symlink. THAT IS WRONG! BeFS has no "
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"on disk special files", inode->i_ino);
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goto unacquire_bh;
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}
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brelse(bh);
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befs_debug(sb, "<--- %s", __func__);
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unlock_new_inode(inode);
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return inode;
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unacquire_bh:
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brelse(bh);
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unacquire_none:
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iget_failed(inode);
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befs_debug(sb, "<--- %s - Bad inode", __func__);
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return ERR_PTR(-EIO);
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}
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|
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/* Initialize the inode cache. Called at fs setup.
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*
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* Taken from NFS implementation by Al Viro.
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*/
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static int __init
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befs_init_inodecache(void)
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{
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befs_inode_cachep = kmem_cache_create_usercopy("befs_inode_cache",
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sizeof(struct befs_inode_info), 0,
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(SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
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SLAB_ACCOUNT),
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offsetof(struct befs_inode_info,
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i_data.symlink),
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sizeof_field(struct befs_inode_info,
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i_data.symlink),
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init_once);
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if (befs_inode_cachep == NULL)
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return -ENOMEM;
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|
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return 0;
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}
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|
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/* Called at fs teardown.
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*
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* Taken from NFS implementation by Al Viro.
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*/
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static void
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befs_destroy_inodecache(void)
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{
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/*
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* Make sure all delayed rcu free inodes are flushed before we
|
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* destroy cache.
|
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*/
|
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rcu_barrier();
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kmem_cache_destroy(befs_inode_cachep);
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}
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|
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/*
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* The inode of symbolic link is different to data stream.
|
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* The data stream become link name. Unless the LONG_SYMLINK
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* flag is set.
|
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*/
|
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static int befs_symlink_readpage(struct file *unused, struct page *page)
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{
|
|
struct inode *inode = page->mapping->host;
|
|
struct super_block *sb = inode->i_sb;
|
|
struct befs_inode_info *befs_ino = BEFS_I(inode);
|
|
befs_data_stream *data = &befs_ino->i_data.ds;
|
|
befs_off_t len = data->size;
|
|
char *link = page_address(page);
|
|
|
|
if (len == 0 || len > PAGE_SIZE) {
|
|
befs_error(sb, "Long symlink with illegal length");
|
|
goto fail;
|
|
}
|
|
befs_debug(sb, "Follow long symlink");
|
|
|
|
if (befs_read_lsymlink(sb, data, link, len) != len) {
|
|
befs_error(sb, "Failed to read entire long symlink");
|
|
goto fail;
|
|
}
|
|
link[len - 1] = '\0';
|
|
SetPageUptodate(page);
|
|
unlock_page(page);
|
|
return 0;
|
|
fail:
|
|
SetPageError(page);
|
|
unlock_page(page);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* UTF-8 to NLS charset convert routine
|
|
*
|
|
* Uses uni2char() / char2uni() rather than the nls tables directly
|
|
*/
|
|
static int
|
|
befs_utf2nls(struct super_block *sb, const char *in,
|
|
int in_len, char **out, int *out_len)
|
|
{
|
|
struct nls_table *nls = BEFS_SB(sb)->nls;
|
|
int i, o;
|
|
unicode_t uni;
|
|
int unilen, utflen;
|
|
char *result;
|
|
/* The utf8->nls conversion won't make the final nls string bigger
|
|
* than the utf one, but if the string is pure ascii they'll have the
|
|
* same width and an extra char is needed to save the additional \0
|
|
*/
|
|
int maxlen = in_len + 1;
|
|
|
|
befs_debug(sb, "---> %s", __func__);
|
|
|
|
if (!nls) {
|
|
befs_error(sb, "%s called with no NLS table loaded", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*out = result = kmalloc(maxlen, GFP_NOFS);
|
|
if (!*out)
|
|
return -ENOMEM;
|
|
|
|
for (i = o = 0; i < in_len; i += utflen, o += unilen) {
|
|
|
|
/* convert from UTF-8 to Unicode */
|
|
utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
|
|
if (utflen < 0)
|
|
goto conv_err;
|
|
|
|
/* convert from Unicode to nls */
|
|
if (uni > MAX_WCHAR_T)
|
|
goto conv_err;
|
|
unilen = nls->uni2char(uni, &result[o], in_len - o);
|
|
if (unilen < 0)
|
|
goto conv_err;
|
|
}
|
|
result[o] = '\0';
|
|
*out_len = o;
|
|
|
|
befs_debug(sb, "<--- %s", __func__);
|
|
|
|
return o;
|
|
|
|
conv_err:
|
|
befs_error(sb, "Name using character set %s contains a character that "
|
|
"cannot be converted to unicode.", nls->charset);
|
|
befs_debug(sb, "<--- %s", __func__);
|
|
kfree(result);
|
|
return -EILSEQ;
|
|
}
|
|
|
|
/**
|
|
* befs_nls2utf - Convert NLS string to utf8 encodeing
|
|
* @sb: Superblock
|
|
* @in: Input string buffer in NLS format
|
|
* @in_len: Length of input string in bytes
|
|
* @out: The output string in UTF-8 format
|
|
* @out_len: Length of the output buffer
|
|
*
|
|
* Converts input string @in, which is in the format of the loaded NLS map,
|
|
* into a utf8 string.
|
|
*
|
|
* The destination string @out is allocated by this function and the caller is
|
|
* responsible for freeing it with kfree()
|
|
*
|
|
* On return, *@out_len is the length of @out in bytes.
|
|
*
|
|
* On success, the return value is the number of utf8 characters written to
|
|
* the output buffer @out.
|
|
*
|
|
* On Failure, a negative number coresponding to the error code is returned.
|
|
*/
|
|
|
|
static int
|
|
befs_nls2utf(struct super_block *sb, const char *in,
|
|
int in_len, char **out, int *out_len)
|
|
{
|
|
struct nls_table *nls = BEFS_SB(sb)->nls;
|
|
int i, o;
|
|
wchar_t uni;
|
|
int unilen, utflen;
|
|
char *result;
|
|
/*
|
|
* There are nls characters that will translate to 3-chars-wide UTF-8
|
|
* characters, an additional byte is needed to save the final \0
|
|
* in special cases
|
|
*/
|
|
int maxlen = (3 * in_len) + 1;
|
|
|
|
befs_debug(sb, "---> %s\n", __func__);
|
|
|
|
if (!nls) {
|
|
befs_error(sb, "%s called with no NLS table loaded.",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*out = result = kmalloc(maxlen, GFP_NOFS);
|
|
if (!*out) {
|
|
*out_len = 0;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = o = 0; i < in_len; i += unilen, o += utflen) {
|
|
|
|
/* convert from nls to unicode */
|
|
unilen = nls->char2uni(&in[i], in_len - i, &uni);
|
|
if (unilen < 0)
|
|
goto conv_err;
|
|
|
|
/* convert from unicode to UTF-8 */
|
|
utflen = utf32_to_utf8(uni, &result[o], 3);
|
|
if (utflen <= 0)
|
|
goto conv_err;
|
|
}
|
|
|
|
result[o] = '\0';
|
|
*out_len = o;
|
|
|
|
befs_debug(sb, "<--- %s", __func__);
|
|
|
|
return i;
|
|
|
|
conv_err:
|
|
befs_error(sb, "Name using character set %s contains a character that "
|
|
"cannot be converted to unicode.", nls->charset);
|
|
befs_debug(sb, "<--- %s", __func__);
|
|
kfree(result);
|
|
return -EILSEQ;
|
|
}
|
|
|
|
static struct inode *befs_nfs_get_inode(struct super_block *sb, uint64_t ino,
|
|
uint32_t generation)
|
|
{
|
|
/* No need to handle i_generation */
|
|
return befs_iget(sb, ino);
|
|
}
|
|
|
|
/*
|
|
* Map a NFS file handle to a corresponding dentry
|
|
*/
|
|
static struct dentry *befs_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,
|
|
befs_nfs_get_inode);
|
|
}
|
|
|
|
/*
|
|
* Find the parent for a file specified by NFS handle
|
|
*/
|
|
static struct dentry *befs_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,
|
|
befs_nfs_get_inode);
|
|
}
|
|
|
|
static struct dentry *befs_get_parent(struct dentry *child)
|
|
{
|
|
struct inode *parent;
|
|
struct befs_inode_info *befs_ino = BEFS_I(d_inode(child));
|
|
|
|
parent = befs_iget(child->d_sb,
|
|
(unsigned long)befs_ino->i_parent.start);
|
|
if (IS_ERR(parent))
|
|
return ERR_CAST(parent);
|
|
|
|
return d_obtain_alias(parent);
|
|
}
|
|
|
|
enum {
|
|
Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
|
|
};
|
|
|
|
static const match_table_t befs_tokens = {
|
|
{Opt_uid, "uid=%d"},
|
|
{Opt_gid, "gid=%d"},
|
|
{Opt_charset, "iocharset=%s"},
|
|
{Opt_debug, "debug"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
static int
|
|
parse_options(char *options, struct befs_mount_options *opts)
|
|
{
|
|
char *p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int option;
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
|
|
/* Initialize options */
|
|
opts->uid = GLOBAL_ROOT_UID;
|
|
opts->gid = GLOBAL_ROOT_GID;
|
|
opts->use_uid = 0;
|
|
opts->use_gid = 0;
|
|
opts->iocharset = NULL;
|
|
opts->debug = 0;
|
|
|
|
if (!options)
|
|
return 1;
|
|
|
|
while ((p = strsep(&options, ",")) != NULL) {
|
|
int token;
|
|
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, befs_tokens, args);
|
|
switch (token) {
|
|
case Opt_uid:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
uid = INVALID_UID;
|
|
if (option >= 0)
|
|
uid = make_kuid(current_user_ns(), option);
|
|
if (!uid_valid(uid)) {
|
|
pr_err("Invalid uid %d, "
|
|
"using default\n", option);
|
|
break;
|
|
}
|
|
opts->uid = uid;
|
|
opts->use_uid = 1;
|
|
break;
|
|
case Opt_gid:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
gid = INVALID_GID;
|
|
if (option >= 0)
|
|
gid = make_kgid(current_user_ns(), option);
|
|
if (!gid_valid(gid)) {
|
|
pr_err("Invalid gid %d, "
|
|
"using default\n", option);
|
|
break;
|
|
}
|
|
opts->gid = gid;
|
|
opts->use_gid = 1;
|
|
break;
|
|
case Opt_charset:
|
|
kfree(opts->iocharset);
|
|
opts->iocharset = match_strdup(&args[0]);
|
|
if (!opts->iocharset) {
|
|
pr_err("allocation failure for "
|
|
"iocharset string\n");
|
|
return 0;
|
|
}
|
|
break;
|
|
case Opt_debug:
|
|
opts->debug = 1;
|
|
break;
|
|
default:
|
|
pr_err("Unrecognized mount option \"%s\" "
|
|
"or missing value\n", p);
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int befs_show_options(struct seq_file *m, struct dentry *root)
|
|
{
|
|
struct befs_sb_info *befs_sb = BEFS_SB(root->d_sb);
|
|
struct befs_mount_options *opts = &befs_sb->mount_opts;
|
|
|
|
if (!uid_eq(opts->uid, GLOBAL_ROOT_UID))
|
|
seq_printf(m, ",uid=%u",
|
|
from_kuid_munged(&init_user_ns, opts->uid));
|
|
if (!gid_eq(opts->gid, GLOBAL_ROOT_GID))
|
|
seq_printf(m, ",gid=%u",
|
|
from_kgid_munged(&init_user_ns, opts->gid));
|
|
if (opts->iocharset)
|
|
seq_printf(m, ",charset=%s", opts->iocharset);
|
|
if (opts->debug)
|
|
seq_puts(m, ",debug");
|
|
return 0;
|
|
}
|
|
|
|
/* This function has the responsibiltiy of getting the
|
|
* filesystem ready for unmounting.
|
|
* Basically, we free everything that we allocated in
|
|
* befs_read_inode
|
|
*/
|
|
static void
|
|
befs_put_super(struct super_block *sb)
|
|
{
|
|
kfree(BEFS_SB(sb)->mount_opts.iocharset);
|
|
BEFS_SB(sb)->mount_opts.iocharset = NULL;
|
|
unload_nls(BEFS_SB(sb)->nls);
|
|
kfree(sb->s_fs_info);
|
|
sb->s_fs_info = NULL;
|
|
}
|
|
|
|
/* Allocate private field of the superblock, fill it.
|
|
*
|
|
* Finish filling the public superblock fields
|
|
* Make the root directory
|
|
* Load a set of NLS translations if needed.
|
|
*/
|
|
static int
|
|
befs_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct befs_sb_info *befs_sb;
|
|
befs_super_block *disk_sb;
|
|
struct inode *root;
|
|
long ret = -EINVAL;
|
|
const unsigned long sb_block = 0;
|
|
const off_t x86_sb_off = 512;
|
|
int blocksize;
|
|
|
|
sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
|
|
if (sb->s_fs_info == NULL)
|
|
goto unacquire_none;
|
|
|
|
befs_sb = BEFS_SB(sb);
|
|
|
|
if (!parse_options((char *) data, &befs_sb->mount_opts)) {
|
|
if (!silent)
|
|
befs_error(sb, "cannot parse mount options");
|
|
goto unacquire_priv_sbp;
|
|
}
|
|
|
|
befs_debug(sb, "---> %s", __func__);
|
|
|
|
if (!sb_rdonly(sb)) {
|
|
befs_warning(sb,
|
|
"No write support. Marking filesystem read-only");
|
|
sb->s_flags |= SB_RDONLY;
|
|
}
|
|
|
|
/*
|
|
* Set dummy blocksize to read super block.
|
|
* Will be set to real fs blocksize later.
|
|
*
|
|
* Linux 2.4.10 and later refuse to read blocks smaller than
|
|
* the logical block size for the device. But we also need to read at
|
|
* least 1k to get the second 512 bytes of the volume.
|
|
*/
|
|
blocksize = sb_min_blocksize(sb, 1024);
|
|
if (!blocksize) {
|
|
if (!silent)
|
|
befs_error(sb, "unable to set blocksize");
|
|
goto unacquire_priv_sbp;
|
|
}
|
|
|
|
bh = sb_bread(sb, sb_block);
|
|
if (!bh) {
|
|
if (!silent)
|
|
befs_error(sb, "unable to read superblock");
|
|
goto unacquire_priv_sbp;
|
|
}
|
|
|
|
/* account for offset of super block on x86 */
|
|
disk_sb = (befs_super_block *) bh->b_data;
|
|
if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
|
|
(disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
|
|
befs_debug(sb, "Using PPC superblock location");
|
|
} else {
|
|
befs_debug(sb, "Using x86 superblock location");
|
|
disk_sb =
|
|
(befs_super_block *) ((void *) bh->b_data + x86_sb_off);
|
|
}
|
|
|
|
if ((befs_load_sb(sb, disk_sb) != BEFS_OK) ||
|
|
(befs_check_sb(sb) != BEFS_OK))
|
|
goto unacquire_bh;
|
|
|
|
befs_dump_super_block(sb, disk_sb);
|
|
|
|
brelse(bh);
|
|
|
|
if (befs_sb->num_blocks > ~((sector_t)0)) {
|
|
if (!silent)
|
|
befs_error(sb, "blocks count: %llu is larger than the host can use",
|
|
befs_sb->num_blocks);
|
|
goto unacquire_priv_sbp;
|
|
}
|
|
|
|
/*
|
|
* set up enough so that it can read an inode
|
|
* Fill in kernel superblock fields from private sb
|
|
*/
|
|
sb->s_magic = BEFS_SUPER_MAGIC;
|
|
/* Set real blocksize of fs */
|
|
sb_set_blocksize(sb, (ulong) befs_sb->block_size);
|
|
sb->s_op = &befs_sops;
|
|
sb->s_export_op = &befs_export_operations;
|
|
sb->s_time_min = 0;
|
|
sb->s_time_max = 0xffffffffffffll;
|
|
root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
|
|
if (IS_ERR(root)) {
|
|
ret = PTR_ERR(root);
|
|
goto unacquire_priv_sbp;
|
|
}
|
|
sb->s_root = d_make_root(root);
|
|
if (!sb->s_root) {
|
|
if (!silent)
|
|
befs_error(sb, "get root inode failed");
|
|
goto unacquire_priv_sbp;
|
|
}
|
|
|
|
/* load nls library */
|
|
if (befs_sb->mount_opts.iocharset) {
|
|
befs_debug(sb, "Loading nls: %s",
|
|
befs_sb->mount_opts.iocharset);
|
|
befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
|
|
if (!befs_sb->nls) {
|
|
befs_warning(sb, "Cannot load nls %s"
|
|
" loading default nls",
|
|
befs_sb->mount_opts.iocharset);
|
|
befs_sb->nls = load_nls_default();
|
|
}
|
|
/* load default nls if none is specified in mount options */
|
|
} else {
|
|
befs_debug(sb, "Loading default nls");
|
|
befs_sb->nls = load_nls_default();
|
|
}
|
|
|
|
return 0;
|
|
|
|
unacquire_bh:
|
|
brelse(bh);
|
|
|
|
unacquire_priv_sbp:
|
|
kfree(befs_sb->mount_opts.iocharset);
|
|
kfree(sb->s_fs_info);
|
|
sb->s_fs_info = NULL;
|
|
|
|
unacquire_none:
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
befs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
sync_filesystem(sb);
|
|
if (!(*flags & SB_RDONLY))
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
befs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
|
|
befs_debug(sb, "---> %s", __func__);
|
|
|
|
buf->f_type = BEFS_SUPER_MAGIC;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_blocks = BEFS_SB(sb)->num_blocks;
|
|
buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
|
|
buf->f_bavail = buf->f_bfree;
|
|
buf->f_files = 0; /* UNKNOWN */
|
|
buf->f_ffree = 0; /* UNKNOWN */
|
|
buf->f_fsid.val[0] = (u32)id;
|
|
buf->f_fsid.val[1] = (u32)(id >> 32);
|
|
buf->f_namelen = BEFS_NAME_LEN;
|
|
|
|
befs_debug(sb, "<--- %s", __func__);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *
|
|
befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
|
|
void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type befs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "befs",
|
|
.mount = befs_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("befs");
|
|
|
|
static int __init
|
|
init_befs_fs(void)
|
|
{
|
|
int err;
|
|
|
|
pr_info("version: %s\n", BEFS_VERSION);
|
|
|
|
err = befs_init_inodecache();
|
|
if (err)
|
|
goto unacquire_none;
|
|
|
|
err = register_filesystem(&befs_fs_type);
|
|
if (err)
|
|
goto unacquire_inodecache;
|
|
|
|
return 0;
|
|
|
|
unacquire_inodecache:
|
|
befs_destroy_inodecache();
|
|
|
|
unacquire_none:
|
|
return err;
|
|
}
|
|
|
|
static void __exit
|
|
exit_befs_fs(void)
|
|
{
|
|
befs_destroy_inodecache();
|
|
|
|
unregister_filesystem(&befs_fs_type);
|
|
}
|
|
|
|
/*
|
|
* Macros that typecheck the init and exit functions,
|
|
* ensures that they are called at init and cleanup,
|
|
* and eliminates warnings about unused functions.
|
|
*/
|
|
module_init(init_befs_fs)
|
|
module_exit(exit_befs_fs)
|