// SPDX-License-Identifier: GPL-2.0 /* * linux/fs/hfsplus/xattr.c * * Vyacheslav Dubeyko <slava@dubeyko.com> * * Logic of processing extended attributes */ #include "hfsplus_fs.h" #include <linux/posix_acl_xattr.h> #include <linux/nls.h> #include "xattr.h" #include "acl.h" static int hfsplus_removexattr(struct inode *inode, const char *name); const struct xattr_handler *hfsplus_xattr_handlers[] = { &hfsplus_xattr_osx_handler, &hfsplus_xattr_user_handler, &hfsplus_xattr_trusted_handler, #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL &posix_acl_access_xattr_handler, &posix_acl_default_xattr_handler, #endif &hfsplus_xattr_security_handler, NULL }; static int strcmp_xattr_finder_info(const char *name) { if (name) { return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME, sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME)); } return -1; } static int strcmp_xattr_acl(const char *name) { if (name) { return strncmp(name, HFSPLUS_XATTR_ACL_NAME, sizeof(HFSPLUS_XATTR_ACL_NAME)); } return -1; } static bool is_known_namespace(const char *name) { if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) && strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) && strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) && strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN)) return false; return true; } static void hfsplus_init_header_node(struct inode *attr_file, u32 clump_size, char *buf, u16 node_size) { struct hfs_bnode_desc *desc; struct hfs_btree_header_rec *head; u16 offset; __be16 *rec_offsets; u32 hdr_node_map_rec_bits; char *bmp; u32 used_nodes; u32 used_bmp_bytes; u64 tmp; hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n", clump_size, node_size); /* The end of the node contains list of record offsets */ rec_offsets = (__be16 *)(buf + node_size); desc = (struct hfs_bnode_desc *)buf; desc->type = HFS_NODE_HEADER; desc->num_recs = cpu_to_be16(HFSPLUS_BTREE_HDR_NODE_RECS_COUNT); offset = sizeof(struct hfs_bnode_desc); *--rec_offsets = cpu_to_be16(offset); head = (struct hfs_btree_header_rec *)(buf + offset); head->node_size = cpu_to_be16(node_size); tmp = i_size_read(attr_file); do_div(tmp, node_size); head->node_count = cpu_to_be32(tmp); head->free_nodes = cpu_to_be32(be32_to_cpu(head->node_count) - 1); head->clump_size = cpu_to_be32(clump_size); head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS); head->max_key_len = cpu_to_be16(HFSPLUS_ATTR_KEYLEN - sizeof(u16)); offset += sizeof(struct hfs_btree_header_rec); *--rec_offsets = cpu_to_be16(offset); offset += HFSPLUS_BTREE_HDR_USER_BYTES; *--rec_offsets = cpu_to_be16(offset); hdr_node_map_rec_bits = 8 * (node_size - offset - (4 * sizeof(u16))); if (be32_to_cpu(head->node_count) > hdr_node_map_rec_bits) { u32 map_node_bits; u32 map_nodes; desc->next = cpu_to_be32(be32_to_cpu(head->leaf_tail) + 1); map_node_bits = 8 * (node_size - sizeof(struct hfs_bnode_desc) - (2 * sizeof(u16)) - 2); map_nodes = (be32_to_cpu(head->node_count) - hdr_node_map_rec_bits + (map_node_bits - 1)) / map_node_bits; be32_add_cpu(&head->free_nodes, 0 - map_nodes); } bmp = buf + offset; used_nodes = be32_to_cpu(head->node_count) - be32_to_cpu(head->free_nodes); used_bmp_bytes = used_nodes / 8; if (used_bmp_bytes) { memset(bmp, 0xFF, used_bmp_bytes); bmp += used_bmp_bytes; used_nodes %= 8; } *bmp = ~(0xFF >> used_nodes); offset += hdr_node_map_rec_bits / 8; *--rec_offsets = cpu_to_be16(offset); } static int hfsplus_create_attributes_file(struct super_block *sb) { int err = 0; struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); struct inode *attr_file; struct hfsplus_inode_info *hip; u32 clump_size; u16 node_size = HFSPLUS_ATTR_TREE_NODE_SIZE; char *buf; int index, written; struct address_space *mapping; struct page *page; int old_state = HFSPLUS_EMPTY_ATTR_TREE; hfs_dbg(ATTR_MOD, "create_attr_file: ino %d\n", HFSPLUS_ATTR_CNID); check_attr_tree_state_again: switch (atomic_read(&sbi->attr_tree_state)) { case HFSPLUS_EMPTY_ATTR_TREE: if (old_state != atomic_cmpxchg(&sbi->attr_tree_state, old_state, HFSPLUS_CREATING_ATTR_TREE)) goto check_attr_tree_state_again; break; case HFSPLUS_CREATING_ATTR_TREE: /* * This state means that another thread is in process * of AttributesFile creation. Theoretically, it is * possible to be here. But really __setxattr() method * first of all calls hfs_find_init() for lookup in * B-tree of CatalogFile. This method locks mutex of * CatalogFile's B-tree. As a result, if some thread * is inside AttributedFile creation operation then * another threads will be waiting unlocking of * CatalogFile's B-tree's mutex. However, if code will * change then we will return error code (-EAGAIN) from * here. Really, it means that first try to set of xattr * fails with error but second attempt will have success. */ return -EAGAIN; case HFSPLUS_VALID_ATTR_TREE: return 0; case HFSPLUS_FAILED_ATTR_TREE: return -EOPNOTSUPP; default: BUG(); } attr_file = hfsplus_iget(sb, HFSPLUS_ATTR_CNID); if (IS_ERR(attr_file)) { pr_err("failed to load attributes file\n"); return PTR_ERR(attr_file); } BUG_ON(i_size_read(attr_file) != 0); hip = HFSPLUS_I(attr_file); clump_size = hfsplus_calc_btree_clump_size(sb->s_blocksize, node_size, sbi->sect_count, HFSPLUS_ATTR_CNID); mutex_lock(&hip->extents_lock); hip->clump_blocks = clump_size >> sbi->alloc_blksz_shift; mutex_unlock(&hip->extents_lock); if (sbi->free_blocks <= (hip->clump_blocks << 1)) { err = -ENOSPC; goto end_attr_file_creation; } while (hip->alloc_blocks < hip->clump_blocks) { err = hfsplus_file_extend(attr_file, false); if (unlikely(err)) { pr_err("failed to extend attributes file\n"); goto end_attr_file_creation; } hip->phys_size = attr_file->i_size = (loff_t)hip->alloc_blocks << sbi->alloc_blksz_shift; hip->fs_blocks = hip->alloc_blocks << sbi->fs_shift; inode_set_bytes(attr_file, attr_file->i_size); } buf = kzalloc(node_size, GFP_NOFS); if (!buf) { pr_err("failed to allocate memory for header node\n"); err = -ENOMEM; goto end_attr_file_creation; } hfsplus_init_header_node(attr_file, clump_size, buf, node_size); mapping = attr_file->i_mapping; index = 0; written = 0; for (; written < node_size; index++, written += PAGE_SIZE) { void *kaddr; page = read_mapping_page(mapping, index, NULL); if (IS_ERR(page)) { err = PTR_ERR(page); goto failed_header_node_init; } kaddr = kmap_atomic(page); memcpy(kaddr, buf + written, min_t(size_t, PAGE_SIZE, node_size - written)); kunmap_atomic(kaddr); set_page_dirty(page); put_page(page); } hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY); sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); if (!sbi->attr_tree) pr_err("failed to load attributes file\n"); failed_header_node_init: kfree(buf); end_attr_file_creation: iput(attr_file); if (!err) atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); else if (err == -ENOSPC) atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); else atomic_set(&sbi->attr_tree_state, HFSPLUS_FAILED_ATTR_TREE); return err; } int __hfsplus_setxattr(struct inode *inode, const char *name, const void *value, size_t size, int flags) { int err = 0; struct hfs_find_data cat_fd; hfsplus_cat_entry entry; u16 cat_entry_flags, cat_entry_type; u16 folder_finderinfo_len = sizeof(struct DInfo) + sizeof(struct DXInfo); u16 file_finderinfo_len = sizeof(struct FInfo) + sizeof(struct FXInfo); if ((!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode)) || HFSPLUS_IS_RSRC(inode)) return -EOPNOTSUPP; if (value == NULL) return hfsplus_removexattr(inode, name); err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd); if (err) { pr_err("can't init xattr find struct\n"); return err; } err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd); if (err) { pr_err("catalog searching failed\n"); goto end_setxattr; } if (!strcmp_xattr_finder_info(name)) { if (flags & XATTR_CREATE) { pr_err("xattr exists yet\n"); err = -EOPNOTSUPP; goto end_setxattr; } hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset, sizeof(hfsplus_cat_entry)); if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) { if (size == folder_finderinfo_len) { memcpy(&entry.folder.user_info, value, folder_finderinfo_len); hfs_bnode_write(cat_fd.bnode, &entry, cat_fd.entryoffset, sizeof(struct hfsplus_cat_folder)); hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); } else { err = -ERANGE; goto end_setxattr; } } else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) { if (size == file_finderinfo_len) { memcpy(&entry.file.user_info, value, file_finderinfo_len); hfs_bnode_write(cat_fd.bnode, &entry, cat_fd.entryoffset, sizeof(struct hfsplus_cat_file)); hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); } else { err = -ERANGE; goto end_setxattr; } } else { err = -EOPNOTSUPP; goto end_setxattr; } goto end_setxattr; } if (!HFSPLUS_SB(inode->i_sb)->attr_tree) { err = hfsplus_create_attributes_file(inode->i_sb); if (unlikely(err)) goto end_setxattr; } if (hfsplus_attr_exists(inode, name)) { if (flags & XATTR_CREATE) { pr_err("xattr exists yet\n"); err = -EOPNOTSUPP; goto end_setxattr; } err = hfsplus_delete_attr(inode, name); if (err) goto end_setxattr; err = hfsplus_create_attr(inode, name, value, size); if (err) goto end_setxattr; } else { if (flags & XATTR_REPLACE) { pr_err("cannot replace xattr\n"); err = -EOPNOTSUPP; goto end_setxattr; } err = hfsplus_create_attr(inode, name, value, size); if (err) goto end_setxattr; } cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset); if (cat_entry_type == HFSPLUS_FOLDER) { cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + offsetof(struct hfsplus_cat_folder, flags)); cat_entry_flags |= HFSPLUS_XATTR_EXISTS; if (!strcmp_xattr_acl(name)) cat_entry_flags |= HFSPLUS_ACL_EXISTS; hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + offsetof(struct hfsplus_cat_folder, flags), cat_entry_flags); hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); } else if (cat_entry_type == HFSPLUS_FILE) { cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + offsetof(struct hfsplus_cat_file, flags)); cat_entry_flags |= HFSPLUS_XATTR_EXISTS; if (!strcmp_xattr_acl(name)) cat_entry_flags |= HFSPLUS_ACL_EXISTS; hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + offsetof(struct hfsplus_cat_file, flags), cat_entry_flags); hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); } else { pr_err("invalid catalog entry type\n"); err = -EIO; goto end_setxattr; } end_setxattr: hfs_find_exit(&cat_fd); return err; } static int name_len(const char *xattr_name, int xattr_name_len) { int len = xattr_name_len + 1; if (!is_known_namespace(xattr_name)) len += XATTR_MAC_OSX_PREFIX_LEN; return len; } static int copy_name(char *buffer, const char *xattr_name, int name_len) { int len = name_len; int offset = 0; if (!is_known_namespace(xattr_name)) { strncpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN); offset += XATTR_MAC_OSX_PREFIX_LEN; len += XATTR_MAC_OSX_PREFIX_LEN; } strncpy(buffer + offset, xattr_name, name_len); memset(buffer + offset + name_len, 0, 1); len += 1; return len; } int hfsplus_setxattr(struct inode *inode, const char *name, const void *value, size_t size, int flags, const char *prefix, size_t prefixlen) { char *xattr_name; int res; xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, GFP_KERNEL); if (!xattr_name) return -ENOMEM; strcpy(xattr_name, prefix); strcpy(xattr_name + prefixlen, name); res = __hfsplus_setxattr(inode, xattr_name, value, size, flags); kfree(xattr_name); return res; } static ssize_t hfsplus_getxattr_finder_info(struct inode *inode, void *value, size_t size) { ssize_t res = 0; struct hfs_find_data fd; u16 entry_type; u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo); u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo); u16 record_len = max(folder_rec_len, file_rec_len); u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)]; u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)]; if (size >= record_len) { res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); if (res) { pr_err("can't init xattr find struct\n"); return res; } res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); if (res) goto end_getxattr_finder_info; entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset); if (entry_type == HFSPLUS_FOLDER) { hfs_bnode_read(fd.bnode, folder_finder_info, fd.entryoffset + offsetof(struct hfsplus_cat_folder, user_info), folder_rec_len); memcpy(value, folder_finder_info, folder_rec_len); res = folder_rec_len; } else if (entry_type == HFSPLUS_FILE) { hfs_bnode_read(fd.bnode, file_finder_info, fd.entryoffset + offsetof(struct hfsplus_cat_file, user_info), file_rec_len); memcpy(value, file_finder_info, file_rec_len); res = file_rec_len; } else { res = -EOPNOTSUPP; goto end_getxattr_finder_info; } } else res = size ? -ERANGE : record_len; end_getxattr_finder_info: if (size >= record_len) hfs_find_exit(&fd); return res; } ssize_t __hfsplus_getxattr(struct inode *inode, const char *name, void *value, size_t size) { struct hfs_find_data fd; hfsplus_attr_entry *entry; __be32 xattr_record_type; u32 record_type; u16 record_length = 0; ssize_t res = 0; if ((!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode)) || HFSPLUS_IS_RSRC(inode)) return -EOPNOTSUPP; if (!strcmp_xattr_finder_info(name)) return hfsplus_getxattr_finder_info(inode, value, size); if (!HFSPLUS_SB(inode->i_sb)->attr_tree) return -EOPNOTSUPP; entry = hfsplus_alloc_attr_entry(); if (!entry) { pr_err("can't allocate xattr entry\n"); return -ENOMEM; } res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd); if (res) { pr_err("can't init xattr find struct\n"); goto failed_getxattr_init; } res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd); if (res) { if (res == -ENOENT) res = -ENODATA; else pr_err("xattr searching failed\n"); goto out; } hfs_bnode_read(fd.bnode, &xattr_record_type, fd.entryoffset, sizeof(xattr_record_type)); record_type = be32_to_cpu(xattr_record_type); if (record_type == HFSPLUS_ATTR_INLINE_DATA) { record_length = hfs_bnode_read_u16(fd.bnode, fd.entryoffset + offsetof(struct hfsplus_attr_inline_data, length)); if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) { pr_err("invalid xattr record size\n"); res = -EIO; goto out; } } else if (record_type == HFSPLUS_ATTR_FORK_DATA || record_type == HFSPLUS_ATTR_EXTENTS) { pr_err("only inline data xattr are supported\n"); res = -EOPNOTSUPP; goto out; } else { pr_err("invalid xattr record\n"); res = -EIO; goto out; } if (size) { hfs_bnode_read(fd.bnode, entry, fd.entryoffset, offsetof(struct hfsplus_attr_inline_data, raw_bytes) + record_length); } if (size >= record_length) { memcpy(value, entry->inline_data.raw_bytes, record_length); res = record_length; } else res = size ? -ERANGE : record_length; out: hfs_find_exit(&fd); failed_getxattr_init: hfsplus_destroy_attr_entry(entry); return res; } ssize_t hfsplus_getxattr(struct inode *inode, const char *name, void *value, size_t size, const char *prefix, size_t prefixlen) { int res; char *xattr_name; xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, GFP_KERNEL); if (!xattr_name) return -ENOMEM; strcpy(xattr_name, prefix); strcpy(xattr_name + prefixlen, name); res = __hfsplus_getxattr(inode, xattr_name, value, size); kfree(xattr_name); return res; } static inline int can_list(const char *xattr_name) { if (!xattr_name) return 0; return strncmp(xattr_name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) || capable(CAP_SYS_ADMIN); } static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry, char *buffer, size_t size) { ssize_t res = 0; struct inode *inode = d_inode(dentry); struct hfs_find_data fd; u16 entry_type; u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)]; u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)]; unsigned long len, found_bit; int xattr_name_len, symbols_count; res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); if (res) { pr_err("can't init xattr find struct\n"); return res; } res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); if (res) goto end_listxattr_finder_info; entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset); if (entry_type == HFSPLUS_FOLDER) { len = sizeof(struct DInfo) + sizeof(struct DXInfo); hfs_bnode_read(fd.bnode, folder_finder_info, fd.entryoffset + offsetof(struct hfsplus_cat_folder, user_info), len); found_bit = find_first_bit((void *)folder_finder_info, len*8); } else if (entry_type == HFSPLUS_FILE) { len = sizeof(struct FInfo) + sizeof(struct FXInfo); hfs_bnode_read(fd.bnode, file_finder_info, fd.entryoffset + offsetof(struct hfsplus_cat_file, user_info), len); found_bit = find_first_bit((void *)file_finder_info, len*8); } else { res = -EOPNOTSUPP; goto end_listxattr_finder_info; } if (found_bit >= (len*8)) res = 0; else { symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1; xattr_name_len = name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count); if (!buffer || !size) { if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) res = xattr_name_len; } else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) { if (size < xattr_name_len) res = -ERANGE; else { res = copy_name(buffer, HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count); } } } end_listxattr_finder_info: hfs_find_exit(&fd); return res; } ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size) { ssize_t err; ssize_t res = 0; struct inode *inode = d_inode(dentry); struct hfs_find_data fd; u16 key_len = 0; struct hfsplus_attr_key attr_key; char *strbuf; int xattr_name_len; if ((!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode)) || HFSPLUS_IS_RSRC(inode)) return -EOPNOTSUPP; res = hfsplus_listxattr_finder_info(dentry, buffer, size); if (res < 0) return res; else if (!HFSPLUS_SB(inode->i_sb)->attr_tree) return (res == 0) ? -EOPNOTSUPP : res; err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd); if (err) { pr_err("can't init xattr find struct\n"); return err; } strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL); if (!strbuf) { res = -ENOMEM; goto out; } err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd); if (err) { if (err == -ENOENT) { if (res == 0) res = -ENODATA; goto end_listxattr; } else { res = err; goto end_listxattr; } } for (;;) { key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset); if (key_len == 0 || key_len > fd.tree->max_key_len) { pr_err("invalid xattr key length: %d\n", key_len); res = -EIO; goto end_listxattr; } hfs_bnode_read(fd.bnode, &attr_key, fd.keyoffset, key_len + sizeof(key_len)); if (be32_to_cpu(attr_key.cnid) != inode->i_ino) goto end_listxattr; xattr_name_len = NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN; if (hfsplus_uni2asc(inode->i_sb, (const struct hfsplus_unistr *)&fd.key->attr.key_name, strbuf, &xattr_name_len)) { pr_err("unicode conversion failed\n"); res = -EIO; goto end_listxattr; } if (!buffer || !size) { if (can_list(strbuf)) res += name_len(strbuf, xattr_name_len); } else if (can_list(strbuf)) { if (size < (res + name_len(strbuf, xattr_name_len))) { res = -ERANGE; goto end_listxattr; } else res += copy_name(buffer + res, strbuf, xattr_name_len); } if (hfs_brec_goto(&fd, 1)) goto end_listxattr; } end_listxattr: kfree(strbuf); out: hfs_find_exit(&fd); return res; } static int hfsplus_removexattr(struct inode *inode, const char *name) { int err = 0; struct hfs_find_data cat_fd; u16 flags; u16 cat_entry_type; int is_xattr_acl_deleted = 0; int is_all_xattrs_deleted = 0; if (!HFSPLUS_SB(inode->i_sb)->attr_tree) return -EOPNOTSUPP; if (!strcmp_xattr_finder_info(name)) return -EOPNOTSUPP; err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd); if (err) { pr_err("can't init xattr find struct\n"); return err; } err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd); if (err) { pr_err("catalog searching failed\n"); goto end_removexattr; } err = hfsplus_delete_attr(inode, name); if (err) goto end_removexattr; is_xattr_acl_deleted = !strcmp_xattr_acl(name); is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL); if (!is_xattr_acl_deleted && !is_all_xattrs_deleted) goto end_removexattr; cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset); if (cat_entry_type == HFSPLUS_FOLDER) { flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + offsetof(struct hfsplus_cat_folder, flags)); if (is_xattr_acl_deleted) flags &= ~HFSPLUS_ACL_EXISTS; if (is_all_xattrs_deleted) flags &= ~HFSPLUS_XATTR_EXISTS; hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + offsetof(struct hfsplus_cat_folder, flags), flags); hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); } else if (cat_entry_type == HFSPLUS_FILE) { flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset + offsetof(struct hfsplus_cat_file, flags)); if (is_xattr_acl_deleted) flags &= ~HFSPLUS_ACL_EXISTS; if (is_all_xattrs_deleted) flags &= ~HFSPLUS_XATTR_EXISTS; hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset + offsetof(struct hfsplus_cat_file, flags), flags); hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY); } else { pr_err("invalid catalog entry type\n"); err = -EIO; goto end_removexattr; } end_removexattr: hfs_find_exit(&cat_fd); return err; } static int hfsplus_osx_getxattr(const struct xattr_handler *handler, struct dentry *unused, struct inode *inode, const char *name, void *buffer, size_t size) { /* * Don't allow retrieving properly prefixed attributes * by prepending them with "osx." */ if (is_known_namespace(name)) return -EOPNOTSUPP; /* * osx is the namespace we use to indicate an unprefixed * attribute on the filesystem (like the ones that OS X * creates), so we pass the name through unmodified (after * ensuring it doesn't conflict with another namespace). */ return __hfsplus_getxattr(inode, name, buffer, size); } static int hfsplus_osx_setxattr(const struct xattr_handler *handler, struct dentry *unused, struct inode *inode, const char *name, const void *buffer, size_t size, int flags) { /* * Don't allow setting properly prefixed attributes * by prepending them with "osx." */ if (is_known_namespace(name)) return -EOPNOTSUPP; /* * osx is the namespace we use to indicate an unprefixed * attribute on the filesystem (like the ones that OS X * creates), so we pass the name through unmodified (after * ensuring it doesn't conflict with another namespace). */ return __hfsplus_setxattr(inode, name, buffer, size, flags); } const struct xattr_handler hfsplus_xattr_osx_handler = { .prefix = XATTR_MAC_OSX_PREFIX, .get = hfsplus_osx_getxattr, .set = hfsplus_osx_setxattr, };