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1028 lines
26 KiB
1028 lines
26 KiB
// 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 <[email protected] |
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* |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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befs_dump_inode(sb, raw_inode); |
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|
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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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/* |
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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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|
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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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|
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set_nlink(inode, 1); |
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|
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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, " |
|
"directory or symlink. THAT IS WRONG! BeFS has no " |
|
"on disk special files", inode->i_ino); |
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goto unacquire_bh; |
|
} |
|
|
|
brelse(bh); |
|
befs_debug(sb, "<--- %s", __func__); |
|
unlock_new_inode(inode); |
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return inode; |
|
|
|
unacquire_bh: |
|
brelse(bh); |
|
|
|
unacquire_none: |
|
iget_failed(inode); |
|
befs_debug(sb, "<--- %s - Bad inode", __func__); |
|
return ERR_PTR(-EIO); |
|
} |
|
|
|
/* Initialize the inode cache. Called at fs setup. |
|
* |
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* Taken from NFS implementation by Al Viro. |
|
*/ |
|
static int __init |
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befs_init_inodecache(void) |
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{ |
|
befs_inode_cachep = kmem_cache_create_usercopy("befs_inode_cache", |
|
sizeof(struct befs_inode_info), 0, |
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(SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| |
|
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), |
|
init_once); |
|
if (befs_inode_cachep == NULL) |
|
return -ENOMEM; |
|
|
|
return 0; |
|
} |
|
|
|
/* Called at fs teardown. |
|
* |
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* Taken from NFS implementation by Al Viro. |
|
*/ |
|
static void |
|
befs_destroy_inodecache(void) |
|
{ |
|
/* |
|
* Make sure all delayed rcu free inodes are flushed before we |
|
* destroy cache. |
|
*/ |
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rcu_barrier(); |
|
kmem_cache_destroy(befs_inode_cachep); |
|
} |
|
|
|
/* |
|
* The inode of symbolic link is different to data stream. |
|
* The data stream become link name. Unless the LONG_SYMLINK |
|
* flag is set. |
|
*/ |
|
static int befs_symlink_readpage(struct file *unused, struct page *page) |
|
{ |
|
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 |
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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 = u64_to_fsid(id); |
|
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)
|
|
|