/* * linux/fs/hfsplus/super.c * * Copyright (C) 2001 * Brad Boyer (flar@allandria.com) * (C) 2003 Ardis Technologies <roman@ardistech.com> * */ #include <linux/module.h> #include <linux/init.h> #include <linux/pagemap.h> #include <linux/fs.h> #include <linux/slab.h> #include <linux/smp_lock.h> #include <linux/vfs.h> #include <linux/nls.h> static struct inode *hfsplus_alloc_inode(struct super_block *sb); static void hfsplus_destroy_inode(struct inode *inode); #include "hfsplus_fs.h" struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) { struct hfs_find_data fd; struct hfsplus_vh *vhdr; struct inode *inode; long err = -EIO; inode = iget_locked(sb, ino); if (!inode) return ERR_PTR(-ENOMEM); if (!(inode->i_state & I_NEW)) return inode; INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); mutex_init(&HFSPLUS_I(inode).extents_lock); HFSPLUS_I(inode).flags = 0; HFSPLUS_I(inode).rsrc_inode = NULL; atomic_set(&HFSPLUS_I(inode).opencnt, 0); if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) { read_inode: hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd); err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); if (!err) err = hfsplus_cat_read_inode(inode, &fd); hfs_find_exit(&fd); if (err) goto bad_inode; goto done; } vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr; switch(inode->i_ino) { case HFSPLUS_ROOT_CNID: goto read_inode; case HFSPLUS_EXT_CNID: hfsplus_inode_read_fork(inode, &vhdr->ext_file); inode->i_mapping->a_ops = &hfsplus_btree_aops; break; case HFSPLUS_CAT_CNID: hfsplus_inode_read_fork(inode, &vhdr->cat_file); inode->i_mapping->a_ops = &hfsplus_btree_aops; break; case HFSPLUS_ALLOC_CNID: hfsplus_inode_read_fork(inode, &vhdr->alloc_file); inode->i_mapping->a_ops = &hfsplus_aops; break; case HFSPLUS_START_CNID: hfsplus_inode_read_fork(inode, &vhdr->start_file); break; case HFSPLUS_ATTR_CNID: hfsplus_inode_read_fork(inode, &vhdr->attr_file); inode->i_mapping->a_ops = &hfsplus_btree_aops; break; default: goto bad_inode; } done: unlock_new_inode(inode); return inode; bad_inode: iget_failed(inode); return ERR_PTR(err); } static int hfsplus_write_inode(struct inode *inode, int unused) { struct hfsplus_vh *vhdr; int ret = 0; dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); hfsplus_ext_write_extent(inode); if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) { return hfsplus_cat_write_inode(inode); } vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr; switch (inode->i_ino) { case HFSPLUS_ROOT_CNID: ret = hfsplus_cat_write_inode(inode); break; case HFSPLUS_EXT_CNID: if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) { HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; inode->i_sb->s_dirt = 1; } hfsplus_inode_write_fork(inode, &vhdr->ext_file); hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree); break; case HFSPLUS_CAT_CNID: if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) { HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; inode->i_sb->s_dirt = 1; } hfsplus_inode_write_fork(inode, &vhdr->cat_file); hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree); break; case HFSPLUS_ALLOC_CNID: if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) { HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; inode->i_sb->s_dirt = 1; } hfsplus_inode_write_fork(inode, &vhdr->alloc_file); break; case HFSPLUS_START_CNID: if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) { HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; inode->i_sb->s_dirt = 1; } hfsplus_inode_write_fork(inode, &vhdr->start_file); break; case HFSPLUS_ATTR_CNID: if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) { HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; inode->i_sb->s_dirt = 1; } hfsplus_inode_write_fork(inode, &vhdr->attr_file); hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree); break; } return ret; } static void hfsplus_clear_inode(struct inode *inode) { dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino); if (HFSPLUS_IS_RSRC(inode)) { HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL; iput(HFSPLUS_I(inode).rsrc_inode); } } static int hfsplus_sync_fs(struct super_block *sb, int wait) { struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; dprint(DBG_SUPER, "hfsplus_write_super\n"); lock_super(sb); sb->s_dirt = 0; vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks); vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc); vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid); vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count); vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count); mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) { if (HFSPLUS_SB(sb).sect_count) { struct buffer_head *bh; u32 block, offset; block = HFSPLUS_SB(sb).blockoffset; block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9); offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1); printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset, HFSPLUS_SB(sb).sect_count, block, offset); bh = sb_bread(sb, block); if (bh) { vhdr = (struct hfsplus_vh *)(bh->b_data + offset); if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) { memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr)); mark_buffer_dirty(bh); brelse(bh); } else printk(KERN_WARNING "hfs: backup not found!\n"); } } HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP; } unlock_super(sb); return 0; } static void hfsplus_write_super(struct super_block *sb) { if (!(sb->s_flags & MS_RDONLY)) hfsplus_sync_fs(sb, 1); else sb->s_dirt = 0; } static void hfsplus_put_super(struct super_block *sb) { dprint(DBG_SUPER, "hfsplus_put_super\n"); if (!sb->s_fs_info) return; lock_kernel(); if (sb->s_dirt) hfsplus_write_super(sb); if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) { struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; vhdr->modify_date = hfsp_now2mt(); 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); } hfs_btree_close(HFSPLUS_SB(sb).cat_tree); hfs_btree_close(HFSPLUS_SB(sb).ext_tree); iput(HFSPLUS_SB(sb).alloc_file); iput(HFSPLUS_SB(sb).hidden_dir); brelse(HFSPLUS_SB(sb).s_vhbh); unload_nls(HFSPLUS_SB(sb).nls); kfree(sb->s_fs_info); sb->s_fs_info = NULL; unlock_kernel(); } static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) { struct super_block *sb = dentry->d_sb; u64 id = huge_encode_dev(sb->s_bdev->bd_dev); buf->f_type = HFSPLUS_SUPER_MAGIC; buf->f_bsize = sb->s_blocksize; buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift; buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift; buf->f_bavail = buf->f_bfree; buf->f_files = 0xFFFFFFFF; buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid; buf->f_fsid.val[0] = (u32)id; buf->f_fsid.val[1] = (u32)(id >> 32); buf->f_namelen = HFSPLUS_MAX_STRLEN; return 0; } static int hfsplus_remount(struct super_block *sb, int *flags, char *data) { if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) return 0; if (!(*flags & MS_RDONLY)) { struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; struct hfsplus_sb_info sbi; memset(&sbi, 0, sizeof(struct hfsplus_sb_info)); sbi.nls = HFSPLUS_SB(sb).nls; if (!hfsplus_parse_options(data, &sbi)) return -EINVAL; if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, " "running fsck.hfsplus is recommended. leaving read-only.\n"); sb->s_flags |= MS_RDONLY; *flags |= MS_RDONLY; } else if (sbi.flags & HFSPLUS_SB_FORCE) { /* nothing */ } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n"); sb->s_flags |= MS_RDONLY; *flags |= MS_RDONLY; } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n"); sb->s_flags |= MS_RDONLY; *flags |= MS_RDONLY; } } return 0; } static const struct super_operations hfsplus_sops = { .alloc_inode = hfsplus_alloc_inode, .destroy_inode = hfsplus_destroy_inode, .write_inode = hfsplus_write_inode, .clear_inode = hfsplus_clear_inode, .put_super = hfsplus_put_super, .write_super = hfsplus_write_super, .sync_fs = hfsplus_sync_fs, .statfs = hfsplus_statfs, .remount_fs = hfsplus_remount, .show_options = hfsplus_show_options, }; static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) { struct hfsplus_vh *vhdr; struct hfsplus_sb_info *sbi; hfsplus_cat_entry entry; struct hfs_find_data fd; struct inode *root, *inode; struct qstr str; struct nls_table *nls = NULL; int err = -EINVAL; sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); if (!sbi) return -ENOMEM; sb->s_fs_info = sbi; INIT_HLIST_HEAD(&sbi->rsrc_inodes); hfsplus_fill_defaults(sbi); if (!hfsplus_parse_options(data, sbi)) { printk(KERN_ERR "hfs: unable to parse mount options\n"); err = -EINVAL; goto cleanup; } /* temporarily use utf8 to correctly find the hidden dir below */ nls = sbi->nls; sbi->nls = load_nls("utf8"); if (!sbi->nls) { printk(KERN_ERR "hfs: unable to load nls for utf8\n"); err = -EINVAL; goto cleanup; } /* Grab the volume header */ if (hfsplus_read_wrapper(sb)) { if (!silent) printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n"); err = -EINVAL; goto cleanup; } vhdr = HFSPLUS_SB(sb).s_vhdr; /* Copy parts of the volume header into the superblock */ sb->s_magic = HFSPLUS_VOLHEAD_SIG; if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { printk(KERN_ERR "hfs: wrong filesystem version\n"); goto cleanup; } HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks); HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks); HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc); HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid); HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count); HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count); HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift; if (!HFSPLUS_SB(sb).data_clump_blocks) HFSPLUS_SB(sb).data_clump_blocks = 1; HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift; if (!HFSPLUS_SB(sb).rsrc_clump_blocks) HFSPLUS_SB(sb).rsrc_clump_blocks = 1; /* 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 (sbi->flags & HFSPLUS_SB_FORCE) { /* 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; } sbi->flags &= ~HFSPLUS_SB_FORCE; /* Load metadata objects (B*Trees) */ HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); if (!HFSPLUS_SB(sb).ext_tree) { printk(KERN_ERR "hfs: failed to load extents file\n"); goto cleanup; } HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); if (!HFSPLUS_SB(sb).cat_tree) { printk(KERN_ERR "hfs: failed to load catalog file\n"); goto cleanup; } 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 cleanup; } HFSPLUS_SB(sb).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 cleanup; } sb->s_root = d_alloc_root(root); if (!sb->s_root) { iput(root); 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)