621 lines
16 KiB
C
621 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/blkdev.h>
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#include <linux/fs.h>
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#include <linux/slab.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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static int hfsplus_system_read_inode(struct inode *inode)
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{
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struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr;
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switch (inode->i_ino) {
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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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return -EIO;
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}
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return 0;
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}
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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 inode *inode;
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int err;
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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)->extent_state = 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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inode->i_ino == HFSPLUS_ROOT_CNID) {
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err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
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if (!err) {
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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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}
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} else {
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err = hfsplus_system_read_inode(inode);
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}
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if (err) {
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iget_failed(inode);
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return ERR_PTR(err);
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}
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unlock_new_inode(inode);
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return inode;
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}
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static int hfsplus_system_write_inode(struct inode *inode)
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{
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
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struct hfsplus_vh *vhdr = sbi->s_vhdr;
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struct hfsplus_fork_raw *fork;
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struct hfs_btree *tree = NULL;
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switch (inode->i_ino) {
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case HFSPLUS_EXT_CNID:
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fork = &vhdr->ext_file;
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tree = sbi->ext_tree;
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break;
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case HFSPLUS_CAT_CNID:
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fork = &vhdr->cat_file;
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tree = sbi->cat_tree;
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break;
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case HFSPLUS_ALLOC_CNID:
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fork = &vhdr->alloc_file;
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break;
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case HFSPLUS_START_CNID:
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fork = &vhdr->start_file;
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break;
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case HFSPLUS_ATTR_CNID:
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fork = &vhdr->attr_file;
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tree = sbi->attr_tree;
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default:
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return -EIO;
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}
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if (fork->total_size != cpu_to_be64(inode->i_size)) {
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set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
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inode->i_sb->s_dirt = 1;
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}
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hfsplus_inode_write_fork(inode, fork);
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if (tree)
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hfs_btree_write(tree);
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return 0;
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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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int err;
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dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
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err = hfsplus_ext_write_extent(inode);
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if (err)
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return err;
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if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
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inode->i_ino == HFSPLUS_ROOT_CNID)
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return hfsplus_cat_write_inode(inode);
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else
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return hfsplus_system_write_inode(inode);
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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_sb_info *sbi = HFSPLUS_SB(sb);
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struct hfsplus_vh *vhdr = sbi->s_vhdr;
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int write_backup = 0;
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int error, error2;
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if (!wait)
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return 0;
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dprint(DBG_SUPER, "hfsplus_write_super\n");
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sb->s_dirt = 0;
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/*
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* Explicitly write out the special metadata inodes.
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*
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* While these special inodes are marked as hashed and written
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* out peridocically by the flusher threads we redirty them
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* during writeout of normal inodes, and thus the life lock
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* prevents us from getting the latest state to disk.
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*/
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error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
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error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
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if (!error)
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error = error2;
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error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
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if (!error)
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error = error2;
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mutex_lock(&sbi->vh_mutex);
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mutex_lock(&sbi->alloc_mutex);
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vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
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vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
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vhdr->folder_count = cpu_to_be32(sbi->folder_count);
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vhdr->file_count = cpu_to_be32(sbi->file_count);
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if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
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memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
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write_backup = 1;
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}
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error2 = hfsplus_submit_bio(sb,
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sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
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sbi->s_vhdr_buf, NULL, WRITE_SYNC);
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if (!error)
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error = error2;
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if (!write_backup)
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goto out;
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error2 = hfsplus_submit_bio(sb,
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sbi->part_start + sbi->sect_count - 2,
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sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
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if (!error)
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error2 = error;
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out:
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mutex_unlock(&sbi->alloc_mutex);
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mutex_unlock(&sbi->vh_mutex);
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if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
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blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
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return error;
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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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struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
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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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if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
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struct hfsplus_vh *vhdr = sbi->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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hfsplus_sync_fs(sb, 1);
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}
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hfs_btree_close(sbi->cat_tree);
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hfs_btree_close(sbi->ext_tree);
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iput(sbi->alloc_file);
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iput(sbi->hidden_dir);
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kfree(sbi->s_vhdr_buf);
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kfree(sbi->s_backup_vhdr_buf);
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unload_nls(sbi->nls);
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kfree(sb->s_fs_info);
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sb->s_fs_info = NULL;
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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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struct hfsplus_sb_info *sbi = HFSPLUS_SB(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 = sbi->total_blocks << sbi->fs_shift;
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buf->f_bfree = sbi->free_blocks << sbi->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 - sbi->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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int force = 0;
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if (!hfsplus_parse_options_remount(data, &force))
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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 "
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"not cleanly unmounted, "
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"running fsck.hfsplus is recommended. "
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"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 (force) {
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/* nothing */
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} else if (vhdr->attributes &
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cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
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printk(KERN_WARNING "hfs: filesystem is marked locked, "
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"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 &
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cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
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printk(KERN_WARNING "hfs: filesystem is "
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"marked journaled, "
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"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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u64 last_fs_block, last_fs_page;
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int err;
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err = -EINVAL;
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
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if (!sbi)
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goto out;
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sb->s_fs_info = sbi;
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mutex_init(&sbi->alloc_mutex);
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mutex_init(&sbi->vh_mutex);
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hfsplus_fill_defaults(sbi);
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err = -EINVAL;
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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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goto out_unload_nls;
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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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goto out_unload_nls;
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}
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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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goto out_unload_nls;
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}
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vhdr = sbi->s_vhdr;
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|
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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 out_free_vhdr;
|
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}
|
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sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
|
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sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
|
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sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
|
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sbi->file_count = be32_to_cpu(vhdr->file_count);
|
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sbi->folder_count = be32_to_cpu(vhdr->folder_count);
|
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sbi->data_clump_blocks =
|
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be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
|
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if (!sbi->data_clump_blocks)
|
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sbi->data_clump_blocks = 1;
|
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sbi->rsrc_clump_blocks =
|
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be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
|
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if (!sbi->rsrc_clump_blocks)
|
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sbi->rsrc_clump_blocks = 1;
|
|
|
|
err = -EFBIG;
|
|
last_fs_block = sbi->total_blocks - 1;
|
|
last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
|
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PAGE_CACHE_SHIFT;
|
|
|
|
if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
|
|
(last_fs_page > (pgoff_t)(~0ULL))) {
|
|
printk(KERN_ERR "hfs: filesystem size too large.\n");
|
|
goto out_free_vhdr;
|
|
}
|
|
|
|
/* Set up operations so we can load metadata */
|
|
sb->s_op = &hfsplus_sops;
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
|
|
if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
|
|
printk(KERN_WARNING "hfs: Filesystem was "
|
|
"not cleanly unmounted, "
|
|
"running fsck.hfsplus is recommended. "
|
|
"mounting read-only.\n");
|
|
sb->s_flags |= MS_RDONLY;
|
|
} else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
|
|
/* nothing */
|
|
} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
|
|
printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
|
|
sb->s_flags |= MS_RDONLY;
|
|
} else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
|
|
!(sb->s_flags & MS_RDONLY)) {
|
|
printk(KERN_WARNING "hfs: write access to "
|
|
"a journaled filesystem is not supported, "
|
|
"use the force option at your own risk, "
|
|
"mounting read-only.\n");
|
|
sb->s_flags |= MS_RDONLY;
|
|
}
|
|
|
|
err = -EINVAL;
|
|
|
|
/* Load metadata objects (B*Trees) */
|
|
sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
|
|
if (!sbi->ext_tree) {
|
|
printk(KERN_ERR "hfs: failed to load extents file\n");
|
|
goto out_free_vhdr;
|
|
}
|
|
sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
|
|
if (!sbi->cat_tree) {
|
|
printk(KERN_ERR "hfs: failed to load catalog file\n");
|
|
goto out_close_ext_tree;
|
|
}
|
|
|
|
inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
|
|
if (IS_ERR(inode)) {
|
|
printk(KERN_ERR "hfs: failed to load allocation file\n");
|
|
err = PTR_ERR(inode);
|
|
goto out_close_cat_tree;
|
|
}
|
|
sbi->alloc_file = inode;
|
|
|
|
/* Load the root directory */
|
|
root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
|
|
if (IS_ERR(root)) {
|
|
printk(KERN_ERR "hfs: failed to load root directory\n");
|
|
err = PTR_ERR(root);
|
|
goto out_put_alloc_file;
|
|
}
|
|
|
|
str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
|
|
str.name = HFSP_HIDDENDIR_NAME;
|
|
err = hfs_find_init(sbi->cat_tree, &fd);
|
|
if (err)
|
|
goto out_put_root;
|
|
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 out_put_root;
|
|
inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto out_put_root;
|
|
}
|
|
sbi->hidden_dir = inode;
|
|
} else
|
|
hfs_find_exit(&fd);
|
|
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
/*
|
|
* 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);
|
|
hfsplus_sync_fs(sb, 1);
|
|
|
|
if (!sbi->hidden_dir) {
|
|
mutex_lock(&sbi->vh_mutex);
|
|
sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
|
|
if (!sbi->hidden_dir) {
|
|
mutex_unlock(&sbi->vh_mutex);
|
|
err = -ENOMEM;
|
|
goto out_put_root;
|
|
}
|
|
err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
|
|
&str, sbi->hidden_dir);
|
|
mutex_unlock(&sbi->vh_mutex);
|
|
if (err)
|
|
goto out_put_hidden_dir;
|
|
|
|
hfsplus_mark_inode_dirty(sbi->hidden_dir,
|
|
HFSPLUS_I_CAT_DIRTY);
|
|
}
|
|
}
|
|
|
|
sb->s_d_op = &hfsplus_dentry_operations;
|
|
sb->s_root = d_alloc_root(root);
|
|
if (!sb->s_root) {
|
|
err = -ENOMEM;
|
|
goto out_put_hidden_dir;
|
|
}
|
|
|
|
unload_nls(sbi->nls);
|
|
sbi->nls = nls;
|
|
return 0;
|
|
|
|
out_put_hidden_dir:
|
|
iput(sbi->hidden_dir);
|
|
out_put_root:
|
|
iput(root);
|
|
out_put_alloc_file:
|
|
iput(sbi->alloc_file);
|
|
out_close_cat_tree:
|
|
hfs_btree_close(sbi->cat_tree);
|
|
out_close_ext_tree:
|
|
hfs_btree_close(sbi->ext_tree);
|
|
out_free_vhdr:
|
|
kfree(sbi->s_vhdr_buf);
|
|
kfree(sbi->s_backup_vhdr_buf);
|
|
out_unload_nls:
|
|
unload_nls(sbi->nls);
|
|
unload_nls(nls);
|
|
kfree(sbi);
|
|
out:
|
|
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_i_callback(struct rcu_head *head)
|
|
{
|
|
struct inode *inode = container_of(head, struct inode, i_rcu);
|
|
|
|
kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
|
|
}
|
|
|
|
static void hfsplus_destroy_inode(struct inode *inode)
|
|
{
|
|
call_rcu(&inode->i_rcu, hfsplus_i_callback);
|
|
}
|
|
|
|
#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
|
|
|
|
static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
|
|
}
|
|
|
|
static struct file_system_type hfsplus_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "hfsplus",
|
|
.mount = hfsplus_mount,
|
|
.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)
|