540 lines
16 KiB
C
540 lines
16 KiB
C
/*
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* linux/fs/hfsplus/super.c
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*
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* Copyright (C) 2001
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* Brad Boyer (flar@allandria.com)
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* (C) 2003 Ardis Technologies <roman@ardistech.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/pagemap.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/smp_lock.h>
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#include <linux/vfs.h>
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#include <linux/nls.h>
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static struct inode *hfsplus_alloc_inode(struct super_block *sb);
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static void hfsplus_destroy_inode(struct inode *inode);
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#include "hfsplus_fs.h"
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struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
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{
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struct hfs_find_data fd;
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struct hfsplus_vh *vhdr;
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struct inode *inode;
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long err = -EIO;
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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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INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
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mutex_init(&HFSPLUS_I(inode).extents_lock);
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HFSPLUS_I(inode).flags = 0;
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HFSPLUS_I(inode).rsrc_inode = NULL;
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atomic_set(&HFSPLUS_I(inode).opencnt, 0);
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if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
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read_inode:
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hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
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err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
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if (!err)
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err = hfsplus_cat_read_inode(inode, &fd);
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hfs_find_exit(&fd);
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if (err)
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goto bad_inode;
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goto done;
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}
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vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
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switch(inode->i_ino) {
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case HFSPLUS_ROOT_CNID:
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goto read_inode;
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case HFSPLUS_EXT_CNID:
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hfsplus_inode_read_fork(inode, &vhdr->ext_file);
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inode->i_mapping->a_ops = &hfsplus_btree_aops;
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break;
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case HFSPLUS_CAT_CNID:
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hfsplus_inode_read_fork(inode, &vhdr->cat_file);
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inode->i_mapping->a_ops = &hfsplus_btree_aops;
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break;
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case HFSPLUS_ALLOC_CNID:
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hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
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inode->i_mapping->a_ops = &hfsplus_aops;
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break;
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case HFSPLUS_START_CNID:
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hfsplus_inode_read_fork(inode, &vhdr->start_file);
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break;
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case HFSPLUS_ATTR_CNID:
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hfsplus_inode_read_fork(inode, &vhdr->attr_file);
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inode->i_mapping->a_ops = &hfsplus_btree_aops;
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break;
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default:
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goto bad_inode;
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}
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done:
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unlock_new_inode(inode);
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return inode;
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bad_inode:
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iget_failed(inode);
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return ERR_PTR(err);
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}
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static int hfsplus_write_inode(struct inode *inode,
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struct writeback_control *wbc)
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{
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struct hfsplus_vh *vhdr;
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int ret = 0;
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dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
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hfsplus_ext_write_extent(inode);
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if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
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return hfsplus_cat_write_inode(inode);
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}
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vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
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switch (inode->i_ino) {
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case HFSPLUS_ROOT_CNID:
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ret = hfsplus_cat_write_inode(inode);
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break;
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case HFSPLUS_EXT_CNID:
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if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
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HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
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inode->i_sb->s_dirt = 1;
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}
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hfsplus_inode_write_fork(inode, &vhdr->ext_file);
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hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
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break;
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case HFSPLUS_CAT_CNID:
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if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
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HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
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inode->i_sb->s_dirt = 1;
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}
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hfsplus_inode_write_fork(inode, &vhdr->cat_file);
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hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
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break;
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case HFSPLUS_ALLOC_CNID:
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if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
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HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
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inode->i_sb->s_dirt = 1;
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}
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hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
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break;
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case HFSPLUS_START_CNID:
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if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
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HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
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inode->i_sb->s_dirt = 1;
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}
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hfsplus_inode_write_fork(inode, &vhdr->start_file);
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break;
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case HFSPLUS_ATTR_CNID:
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if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
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HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
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inode->i_sb->s_dirt = 1;
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}
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hfsplus_inode_write_fork(inode, &vhdr->attr_file);
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hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
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break;
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}
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return ret;
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}
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static void hfsplus_evict_inode(struct inode *inode)
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{
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dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
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truncate_inode_pages(&inode->i_data, 0);
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end_writeback(inode);
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if (HFSPLUS_IS_RSRC(inode)) {
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HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
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iput(HFSPLUS_I(inode).rsrc_inode);
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}
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}
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int hfsplus_sync_fs(struct super_block *sb, int wait)
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{
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struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
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dprint(DBG_SUPER, "hfsplus_write_super\n");
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lock_super(sb);
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sb->s_dirt = 0;
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vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
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vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
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vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
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vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
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vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
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mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
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if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
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if (HFSPLUS_SB(sb).sect_count) {
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struct buffer_head *bh;
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u32 block, offset;
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block = HFSPLUS_SB(sb).blockoffset;
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block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
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offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
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printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
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HFSPLUS_SB(sb).sect_count, block, offset);
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bh = sb_bread(sb, block);
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if (bh) {
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vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
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if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
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memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
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mark_buffer_dirty(bh);
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brelse(bh);
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} else
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printk(KERN_WARNING "hfs: backup not found!\n");
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}
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}
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HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
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}
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unlock_super(sb);
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return 0;
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}
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static void hfsplus_write_super(struct super_block *sb)
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{
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if (!(sb->s_flags & MS_RDONLY))
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hfsplus_sync_fs(sb, 1);
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else
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sb->s_dirt = 0;
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}
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static void hfsplus_put_super(struct super_block *sb)
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{
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dprint(DBG_SUPER, "hfsplus_put_super\n");
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if (!sb->s_fs_info)
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return;
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lock_kernel();
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if (sb->s_dirt)
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hfsplus_write_super(sb);
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if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
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struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
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vhdr->modify_date = hfsp_now2mt();
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vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
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vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
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mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
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sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
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}
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hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
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hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
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iput(HFSPLUS_SB(sb).alloc_file);
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iput(HFSPLUS_SB(sb).hidden_dir);
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brelse(HFSPLUS_SB(sb).s_vhbh);
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unload_nls(HFSPLUS_SB(sb).nls);
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kfree(sb->s_fs_info);
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sb->s_fs_info = NULL;
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unlock_kernel();
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}
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static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct super_block *sb = dentry->d_sb;
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u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
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buf->f_type = HFSPLUS_SUPER_MAGIC;
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buf->f_bsize = sb->s_blocksize;
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buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
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buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
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buf->f_bavail = buf->f_bfree;
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buf->f_files = 0xFFFFFFFF;
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buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
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buf->f_fsid.val[0] = (u32)id;
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buf->f_fsid.val[1] = (u32)(id >> 32);
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buf->f_namelen = HFSPLUS_MAX_STRLEN;
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return 0;
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}
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static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
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{
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if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
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return 0;
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if (!(*flags & MS_RDONLY)) {
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struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
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struct hfsplus_sb_info sbi;
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memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
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sbi.nls = HFSPLUS_SB(sb).nls;
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if (!hfsplus_parse_options(data, &sbi))
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return -EINVAL;
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if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
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printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
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"running fsck.hfsplus is recommended. leaving read-only.\n");
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sb->s_flags |= MS_RDONLY;
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*flags |= MS_RDONLY;
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} else if (sbi.flags & HFSPLUS_SB_FORCE) {
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/* nothing */
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} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
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printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
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sb->s_flags |= MS_RDONLY;
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*flags |= MS_RDONLY;
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} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
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printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
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sb->s_flags |= MS_RDONLY;
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*flags |= MS_RDONLY;
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}
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}
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return 0;
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}
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static const struct super_operations hfsplus_sops = {
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.alloc_inode = hfsplus_alloc_inode,
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.destroy_inode = hfsplus_destroy_inode,
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.write_inode = hfsplus_write_inode,
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.evict_inode = hfsplus_evict_inode,
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.put_super = hfsplus_put_super,
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.write_super = hfsplus_write_super,
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.sync_fs = hfsplus_sync_fs,
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.statfs = hfsplus_statfs,
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.remount_fs = hfsplus_remount,
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.show_options = hfsplus_show_options,
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};
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static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct hfsplus_vh *vhdr;
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struct hfsplus_sb_info *sbi;
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hfsplus_cat_entry entry;
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struct hfs_find_data fd;
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struct inode *root, *inode;
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struct qstr str;
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struct nls_table *nls = NULL;
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int err = -EINVAL;
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
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if (!sbi)
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return -ENOMEM;
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sb->s_fs_info = sbi;
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INIT_HLIST_HEAD(&sbi->rsrc_inodes);
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hfsplus_fill_defaults(sbi);
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if (!hfsplus_parse_options(data, sbi)) {
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printk(KERN_ERR "hfs: unable to parse mount options\n");
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err = -EINVAL;
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goto cleanup;
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}
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/* temporarily use utf8 to correctly find the hidden dir below */
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nls = sbi->nls;
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sbi->nls = load_nls("utf8");
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if (!sbi->nls) {
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printk(KERN_ERR "hfs: unable to load nls for utf8\n");
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err = -EINVAL;
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goto cleanup;
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}
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/* Grab the volume header */
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if (hfsplus_read_wrapper(sb)) {
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if (!silent)
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printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
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err = -EINVAL;
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goto cleanup;
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}
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vhdr = HFSPLUS_SB(sb).s_vhdr;
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/* Copy parts of the volume header into the superblock */
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sb->s_magic = HFSPLUS_VOLHEAD_SIG;
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if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
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be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
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printk(KERN_ERR "hfs: wrong filesystem version\n");
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goto cleanup;
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}
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HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
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HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
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HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
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HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
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HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
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HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
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HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
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if (!HFSPLUS_SB(sb).data_clump_blocks)
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HFSPLUS_SB(sb).data_clump_blocks = 1;
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HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
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if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
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HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
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/* Set up operations so we can load metadata */
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sb->s_op = &hfsplus_sops;
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
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printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
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"running fsck.hfsplus is recommended. mounting read-only.\n");
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sb->s_flags |= MS_RDONLY;
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} else if (sbi->flags & HFSPLUS_SB_FORCE) {
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/* nothing */
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} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
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printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
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sb->s_flags |= MS_RDONLY;
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} else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
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printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
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"use the force option at your own risk, mounting read-only.\n");
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sb->s_flags |= MS_RDONLY;
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}
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sbi->flags &= ~HFSPLUS_SB_FORCE;
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/* Load metadata objects (B*Trees) */
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HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
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if (!HFSPLUS_SB(sb).ext_tree) {
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printk(KERN_ERR "hfs: failed to load extents file\n");
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goto cleanup;
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}
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HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
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if (!HFSPLUS_SB(sb).cat_tree) {
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printk(KERN_ERR "hfs: failed to load catalog file\n");
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goto cleanup;
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}
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inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
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if (IS_ERR(inode)) {
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printk(KERN_ERR "hfs: failed to load allocation file\n");
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err = PTR_ERR(inode);
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goto cleanup;
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}
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HFSPLUS_SB(sb).alloc_file = inode;
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/* Load the root directory */
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root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
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if (IS_ERR(root)) {
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printk(KERN_ERR "hfs: failed to load root directory\n");
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err = PTR_ERR(root);
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goto cleanup;
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}
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sb->s_root = d_alloc_root(root);
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if (!sb->s_root) {
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iput(root);
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err = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
sb->s_root->d_op = &hfsplus_dentry_operations;
|
|
|
|
str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
|
|
str.name = HFSP_HIDDENDIR_NAME;
|
|
hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
|
|
hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
|
|
if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
|
|
hfs_find_exit(&fd);
|
|
if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
|
|
goto cleanup;
|
|
inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto cleanup;
|
|
}
|
|
HFSPLUS_SB(sb).hidden_dir = inode;
|
|
} else
|
|
hfs_find_exit(&fd);
|
|
|
|
if (sb->s_flags & MS_RDONLY)
|
|
goto out;
|
|
|
|
/* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
|
|
* all three are registered with Apple for our use
|
|
*/
|
|
vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
|
|
vhdr->modify_date = hfsp_now2mt();
|
|
be32_add_cpu(&vhdr->write_count, 1);
|
|
vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
|
|
vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
|
|
mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
|
|
sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
|
|
|
|
if (!HFSPLUS_SB(sb).hidden_dir) {
|
|
printk(KERN_DEBUG "hfs: create hidden dir...\n");
|
|
HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
|
|
hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
|
|
&str, HFSPLUS_SB(sb).hidden_dir);
|
|
mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
|
|
}
|
|
out:
|
|
unload_nls(sbi->nls);
|
|
sbi->nls = nls;
|
|
return 0;
|
|
|
|
cleanup:
|
|
hfsplus_put_super(sb);
|
|
unload_nls(nls);
|
|
return err;
|
|
}
|
|
|
|
MODULE_AUTHOR("Brad Boyer");
|
|
MODULE_DESCRIPTION("Extended Macintosh Filesystem");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static struct kmem_cache *hfsplus_inode_cachep;
|
|
|
|
static struct inode *hfsplus_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct hfsplus_inode_info *i;
|
|
|
|
i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
|
|
return i ? &i->vfs_inode : NULL;
|
|
}
|
|
|
|
static void hfsplus_destroy_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
|
|
}
|
|
|
|
#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
|
|
|
|
static int hfsplus_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data,
|
|
struct vfsmount *mnt)
|
|
{
|
|
return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
|
|
mnt);
|
|
}
|
|
|
|
static struct file_system_type hfsplus_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "hfsplus",
|
|
.get_sb = hfsplus_get_sb,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static void hfsplus_init_once(void *p)
|
|
{
|
|
struct hfsplus_inode_info *i = p;
|
|
|
|
inode_init_once(&i->vfs_inode);
|
|
}
|
|
|
|
static int __init init_hfsplus_fs(void)
|
|
{
|
|
int err;
|
|
|
|
hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
|
|
HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
|
|
hfsplus_init_once);
|
|
if (!hfsplus_inode_cachep)
|
|
return -ENOMEM;
|
|
err = register_filesystem(&hfsplus_fs_type);
|
|
if (err)
|
|
kmem_cache_destroy(hfsplus_inode_cachep);
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_hfsplus_fs(void)
|
|
{
|
|
unregister_filesystem(&hfsplus_fs_type);
|
|
kmem_cache_destroy(hfsplus_inode_cachep);
|
|
}
|
|
|
|
module_init(init_hfsplus_fs)
|
|
module_exit(exit_hfsplus_fs)
|