/* * linux/fs/hfsplus/inode.c * * Copyright (C) 2001 * Brad Boyer (flar@allandria.com) * (C) 2003 Ardis Technologies <roman@ardistech.com> * * Inode handling routines */ #include <linux/mm.h> #include <linux/fs.h> #include <linux/pagemap.h> #include <linux/mpage.h> #include <linux/sched.h> #include "hfsplus_fs.h" #include "hfsplus_raw.h" static int hfsplus_readpage(struct file *file, struct page *page) { return block_read_full_page(page, hfsplus_get_block); } static int hfsplus_writepage(struct page *page, struct writeback_control *wbc) { return block_write_full_page(page, hfsplus_get_block, wbc); } static int hfsplus_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) { *pagep = NULL; return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, hfsplus_get_block, &HFSPLUS_I(mapping->host).phys_size); } static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block) { return generic_block_bmap(mapping, block, hfsplus_get_block); } static int hfsplus_releasepage(struct page *page, gfp_t mask) { struct inode *inode = page->mapping->host; struct super_block *sb = inode->i_sb; struct hfs_btree *tree; struct hfs_bnode *node; u32 nidx; int i, res = 1; switch (inode->i_ino) { case HFSPLUS_EXT_CNID: tree = HFSPLUS_SB(sb).ext_tree; break; case HFSPLUS_CAT_CNID: tree = HFSPLUS_SB(sb).cat_tree; break; case HFSPLUS_ATTR_CNID: tree = HFSPLUS_SB(sb).attr_tree; break; default: BUG(); return 0; } if (tree->node_size >= PAGE_CACHE_SIZE) { nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); spin_lock(&tree->hash_lock); node = hfs_bnode_findhash(tree, nidx); if (!node) ; else if (atomic_read(&node->refcnt)) res = 0; if (res && node) { hfs_bnode_unhash(node); hfs_bnode_free(node); } spin_unlock(&tree->hash_lock); } else { nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); spin_lock(&tree->hash_lock); do { node = hfs_bnode_findhash(tree, nidx++); if (!node) continue; if (atomic_read(&node->refcnt)) { res = 0; break; } hfs_bnode_unhash(node); hfs_bnode_free(node); } while (--i && nidx < tree->node_count); spin_unlock(&tree->hash_lock); } return res ? try_to_free_buffers(page) : 0; } static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_t offset, unsigned long nr_segs) { struct file *file = iocb->ki_filp; struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, offset, nr_segs, hfsplus_get_block, NULL); } static int hfsplus_writepages(struct address_space *mapping, struct writeback_control *wbc) { return mpage_writepages(mapping, wbc, hfsplus_get_block); } const struct address_space_operations hfsplus_btree_aops = { .readpage = hfsplus_readpage, .writepage = hfsplus_writepage, .sync_page = block_sync_page, .write_begin = hfsplus_write_begin, .write_end = generic_write_end, .bmap = hfsplus_bmap, .releasepage = hfsplus_releasepage, }; const struct address_space_operations hfsplus_aops = { .readpage = hfsplus_readpage, .writepage = hfsplus_writepage, .sync_page = block_sync_page, .write_begin = hfsplus_write_begin, .write_end = generic_write_end, .bmap = hfsplus_bmap, .direct_IO = hfsplus_direct_IO, .writepages = hfsplus_writepages, }; struct dentry_operations hfsplus_dentry_operations = { .d_hash = hfsplus_hash_dentry, .d_compare = hfsplus_compare_dentry, }; static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { struct hfs_find_data fd; struct super_block *sb = dir->i_sb; struct inode *inode = NULL; int err; if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) goto out; inode = HFSPLUS_I(dir).rsrc_inode; if (inode) goto out; inode = new_inode(sb); if (!inode) return ERR_PTR(-ENOMEM); inode->i_ino = dir->i_ino; INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); init_MUTEX(&HFSPLUS_I(inode).extents_lock); HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC; hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); err = hfsplus_find_cat(sb, dir->i_ino, &fd); if (!err) err = hfsplus_cat_read_inode(inode, &fd); hfs_find_exit(&fd); if (err) { iput(inode); return ERR_PTR(err); } HFSPLUS_I(inode).rsrc_inode = dir; HFSPLUS_I(dir).rsrc_inode = inode; igrab(dir); hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes); mark_inode_dirty(inode); out: d_add(dentry, inode); return NULL; } static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir) { struct super_block *sb = inode->i_sb; u16 mode; mode = be16_to_cpu(perms->mode); inode->i_uid = be32_to_cpu(perms->owner); if (!inode->i_uid && !mode) inode->i_uid = HFSPLUS_SB(sb).uid; inode->i_gid = be32_to_cpu(perms->group); if (!inode->i_gid && !mode) inode->i_gid = HFSPLUS_SB(sb).gid; if (dir) { mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask)); mode |= S_IFDIR; } else if (!mode) mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(HFSPLUS_SB(sb).umask)); inode->i_mode = mode; HFSPLUS_I(inode).rootflags = perms->rootflags; HFSPLUS_I(inode).userflags = perms->userflags; if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE) inode->i_flags |= S_IMMUTABLE; else inode->i_flags &= ~S_IMMUTABLE; if (perms->rootflags & HFSPLUS_FLG_APPEND) inode->i_flags |= S_APPEND; else inode->i_flags &= ~S_APPEND; } static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms) { if (inode->i_flags & S_IMMUTABLE) perms->rootflags |= HFSPLUS_FLG_IMMUTABLE; else perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE; if (inode->i_flags & S_APPEND) perms->rootflags |= HFSPLUS_FLG_APPEND; else perms->rootflags &= ~HFSPLUS_FLG_APPEND; perms->userflags = HFSPLUS_I(inode).userflags; perms->mode = cpu_to_be16(inode->i_mode); perms->owner = cpu_to_be32(inode->i_uid); perms->group = cpu_to_be32(inode->i_gid); perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev); } static int hfsplus_permission(struct inode *inode, int mask, struct nameidata *nd) { /* MAY_EXEC is also used for lookup, if no x bit is set allow lookup, * open_exec has the same test, so it's still not executable, if a x bit * is set fall back to standard permission check. */ if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111)) return 0; return generic_permission(inode, mask, NULL); } static int hfsplus_file_open(struct inode *inode, struct file *file) { if (HFSPLUS_IS_RSRC(inode)) inode = HFSPLUS_I(inode).rsrc_inode; if (atomic_read(&file->f_count) != 1) return 0; atomic_inc(&HFSPLUS_I(inode).opencnt); return 0; } static int hfsplus_file_release(struct inode *inode, struct file *file) { struct super_block *sb = inode->i_sb; if (HFSPLUS_IS_RSRC(inode)) inode = HFSPLUS_I(inode).rsrc_inode; if (atomic_read(&file->f_count) != 0) return 0; if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) { mutex_lock(&inode->i_mutex); hfsplus_file_truncate(inode); if (inode->i_flags & S_DEAD) { hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); hfsplus_delete_inode(inode); } mutex_unlock(&inode->i_mutex); } return 0; } extern const struct inode_operations hfsplus_dir_inode_operations; extern struct file_operations hfsplus_dir_operations; static const struct inode_operations hfsplus_file_inode_operations = { .lookup = hfsplus_file_lookup, .truncate = hfsplus_file_truncate, .permission = hfsplus_permission, .setxattr = hfsplus_setxattr, .getxattr = hfsplus_getxattr, .listxattr = hfsplus_listxattr, }; static const struct file_operations hfsplus_file_operations = { .llseek = generic_file_llseek, .read = do_sync_read, .aio_read = generic_file_aio_read, .write = do_sync_write, .aio_write = generic_file_aio_write, .mmap = generic_file_mmap, .splice_read = generic_file_splice_read, .fsync = file_fsync, .open = hfsplus_file_open, .release = hfsplus_file_release, .ioctl = hfsplus_ioctl, }; struct inode *hfsplus_new_inode(struct super_block *sb, int mode) { struct inode *inode = new_inode(sb); if (!inode) return NULL; inode->i_ino = HFSPLUS_SB(sb).next_cnid++; inode->i_mode = mode; inode->i_uid = current->fsuid; inode->i_gid = current->fsgid; inode->i_nlink = 1; inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); init_MUTEX(&HFSPLUS_I(inode).extents_lock); atomic_set(&HFSPLUS_I(inode).opencnt, 0); HFSPLUS_I(inode).flags = 0; memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec)); memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); HFSPLUS_I(inode).alloc_blocks = 0; HFSPLUS_I(inode).first_blocks = 0; HFSPLUS_I(inode).cached_start = 0; HFSPLUS_I(inode).cached_blocks = 0; HFSPLUS_I(inode).phys_size = 0; HFSPLUS_I(inode).fs_blocks = 0; HFSPLUS_I(inode).rsrc_inode = NULL; if (S_ISDIR(inode->i_mode)) { inode->i_size = 2; HFSPLUS_SB(sb).folder_count++; inode->i_op = &hfsplus_dir_inode_operations; inode->i_fop = &hfsplus_dir_operations; } else if (S_ISREG(inode->i_mode)) { HFSPLUS_SB(sb).file_count++; inode->i_op = &hfsplus_file_inode_operations; inode->i_fop = &hfsplus_file_operations; inode->i_mapping->a_ops = &hfsplus_aops; HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks; } else if (S_ISLNK(inode->i_mode)) { HFSPLUS_SB(sb).file_count++; inode->i_op = &page_symlink_inode_operations; inode->i_mapping->a_ops = &hfsplus_aops; HFSPLUS_I(inode).clump_blocks = 1; } else HFSPLUS_SB(sb).file_count++; insert_inode_hash(inode); mark_inode_dirty(inode); sb->s_dirt = 1; return inode; } void hfsplus_delete_inode(struct inode *inode) { struct super_block *sb = inode->i_sb; if (S_ISDIR(inode->i_mode)) { HFSPLUS_SB(sb).folder_count--; sb->s_dirt = 1; return; } HFSPLUS_SB(sb).file_count--; if (S_ISREG(inode->i_mode)) { if (!inode->i_nlink) { inode->i_size = 0; hfsplus_file_truncate(inode); } } else if (S_ISLNK(inode->i_mode)) { inode->i_size = 0; hfsplus_file_truncate(inode); } sb->s_dirt = 1; } void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) { struct super_block *sb = inode->i_sb; u32 count; int i; memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents, sizeof(hfsplus_extent_rec)); for (count = 0, i = 0; i < 8; i++) count += be32_to_cpu(fork->extents[i].block_count); HFSPLUS_I(inode).first_blocks = count; memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); HFSPLUS_I(inode).cached_start = 0; HFSPLUS_I(inode).cached_blocks = 0; HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks); inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size); HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits); HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift; if (!HFSPLUS_I(inode).clump_blocks) HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks : HFSPLUS_SB(sb).data_clump_blocks; } void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork) { memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents, sizeof(hfsplus_extent_rec)); fork->total_size = cpu_to_be64(inode->i_size); fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks); } int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) { hfsplus_cat_entry entry; int res = 0; u16 type; type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); HFSPLUS_I(inode).dev = 0; if (type == HFSPLUS_FOLDER) { struct hfsplus_cat_folder *folder = &entry.folder; if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) /* panic? */; hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, sizeof(struct hfsplus_cat_folder)); hfsplus_get_perms(inode, &folder->permissions, 1); inode->i_nlink = 1; inode->i_size = 2 + be32_to_cpu(folder->valence); inode->i_atime = hfsp_mt2ut(folder->access_date); inode->i_mtime = hfsp_mt2ut(folder->content_mod_date); inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date); HFSPLUS_I(inode).create_date = folder->create_date; HFSPLUS_I(inode).fs_blocks = 0; inode->i_op = &hfsplus_dir_inode_operations; inode->i_fop = &hfsplus_dir_operations; } else if (type == HFSPLUS_FILE) { struct hfsplus_cat_file *file = &entry.file; if (fd->entrylength < sizeof(struct hfsplus_cat_file)) /* panic? */; hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, sizeof(struct hfsplus_cat_file)); hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ? &file->data_fork : &file->rsrc_fork); hfsplus_get_perms(inode, &file->permissions, 0); inode->i_nlink = 1; if (S_ISREG(inode->i_mode)) { if (file->permissions.dev) inode->i_nlink = be32_to_cpu(file->permissions.dev); inode->i_op = &hfsplus_file_inode_operations; inode->i_fop = &hfsplus_file_operations; inode->i_mapping->a_ops = &hfsplus_aops; } else if (S_ISLNK(inode->i_mode)) { inode->i_op = &page_symlink_inode_operations; inode->i_mapping->a_ops = &hfsplus_aops; } else { init_special_inode(inode, inode->i_mode, be32_to_cpu(file->permissions.dev)); } inode->i_atime = hfsp_mt2ut(file->access_date); inode->i_mtime = hfsp_mt2ut(file->content_mod_date); inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date); HFSPLUS_I(inode).create_date = file->create_date; } else { printk(KERN_ERR "hfs: bad catalog entry used to create inode\n"); res = -EIO; } return res; } int hfsplus_cat_write_inode(struct inode *inode) { struct inode *main_inode = inode; struct hfs_find_data fd; hfsplus_cat_entry entry; if (HFSPLUS_IS_RSRC(inode)) main_inode = HFSPLUS_I(inode).rsrc_inode; if (!main_inode->i_nlink) return 0; if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd)) /* panic? */ return -EIO; if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) /* panic? */ goto out; if (S_ISDIR(main_inode->i_mode)) { struct hfsplus_cat_folder *folder = &entry.folder; if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) /* panic? */; hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, sizeof(struct hfsplus_cat_folder)); /* simple node checks? */ hfsplus_set_perms(inode, &folder->permissions); folder->access_date = hfsp_ut2mt(inode->i_atime); folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); folder->valence = cpu_to_be32(inode->i_size - 2); hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, sizeof(struct hfsplus_cat_folder)); } else if (HFSPLUS_IS_RSRC(inode)) { struct hfsplus_cat_file *file = &entry.file; hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, sizeof(struct hfsplus_cat_file)); hfsplus_inode_write_fork(inode, &file->rsrc_fork); hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, sizeof(struct hfsplus_cat_file)); } else { struct hfsplus_cat_file *file = &entry.file; if (fd.entrylength < sizeof(struct hfsplus_cat_file)) /* panic? */; hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, sizeof(struct hfsplus_cat_file)); hfsplus_inode_write_fork(inode, &file->data_fork); if (S_ISREG(inode->i_mode)) HFSPLUS_I(inode).dev = inode->i_nlink; if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev); hfsplus_set_perms(inode, &file->permissions); if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE) file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); else file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); file->access_date = hfsp_ut2mt(inode->i_atime); file->content_mod_date = hfsp_ut2mt(inode->i_mtime); file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, sizeof(struct hfsplus_cat_file)); } out: hfs_find_exit(&fd); return 0; }