| // SPDX-License-Identifier: LGPL-2.1 |
| /* |
| * Copyright (c) 2012 Taobao. |
| * Written by Tao Ma <boyu.mt@taobao.com> |
| */ |
| |
| #include <linux/iomap.h> |
| #include <linux/fiemap.h> |
| #include <linux/iversion.h> |
| |
| #include "ext4_jbd2.h" |
| #include "ext4.h" |
| #include "xattr.h" |
| #include "truncate.h" |
| |
| #define EXT4_XATTR_SYSTEM_DATA "data" |
| #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS)) |
| #define EXT4_INLINE_DOTDOT_OFFSET 2 |
| #define EXT4_INLINE_DOTDOT_SIZE 4 |
| |
| static int ext4_get_inline_size(struct inode *inode) |
| { |
| if (EXT4_I(inode)->i_inline_off) |
| return EXT4_I(inode)->i_inline_size; |
| |
| return 0; |
| } |
| |
| static int get_max_inline_xattr_value_size(struct inode *inode, |
| struct ext4_iloc *iloc) |
| { |
| struct ext4_xattr_ibody_header *header; |
| struct ext4_xattr_entry *entry; |
| struct ext4_inode *raw_inode; |
| int free, min_offs; |
| |
| min_offs = EXT4_SB(inode->i_sb)->s_inode_size - |
| EXT4_GOOD_OLD_INODE_SIZE - |
| EXT4_I(inode)->i_extra_isize - |
| sizeof(struct ext4_xattr_ibody_header); |
| |
| /* |
| * We need to subtract another sizeof(__u32) since an in-inode xattr |
| * needs an empty 4 bytes to indicate the gap between the xattr entry |
| * and the name/value pair. |
| */ |
| if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
| return EXT4_XATTR_SIZE(min_offs - |
| EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) - |
| EXT4_XATTR_ROUND - sizeof(__u32)); |
| |
| raw_inode = ext4_raw_inode(iloc); |
| header = IHDR(inode, raw_inode); |
| entry = IFIRST(header); |
| |
| /* Compute min_offs. */ |
| for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
| if (!entry->e_value_inum && entry->e_value_size) { |
| size_t offs = le16_to_cpu(entry->e_value_offs); |
| if (offs < min_offs) |
| min_offs = offs; |
| } |
| } |
| free = min_offs - |
| ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32); |
| |
| if (EXT4_I(inode)->i_inline_off) { |
| entry = (struct ext4_xattr_entry *) |
| ((void *)raw_inode + EXT4_I(inode)->i_inline_off); |
| |
| free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); |
| goto out; |
| } |
| |
| free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)); |
| |
| if (free > EXT4_XATTR_ROUND) |
| free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND); |
| else |
| free = 0; |
| |
| out: |
| return free; |
| } |
| |
| /* |
| * Get the maximum size we now can store in an inode. |
| * If we can't find the space for a xattr entry, don't use the space |
| * of the extents since we have no space to indicate the inline data. |
| */ |
| int ext4_get_max_inline_size(struct inode *inode) |
| { |
| int error, max_inline_size; |
| struct ext4_iloc iloc; |
| |
| if (EXT4_I(inode)->i_extra_isize == 0) |
| return 0; |
| |
| error = ext4_get_inode_loc(inode, &iloc); |
| if (error) { |
| ext4_error_inode(inode, __func__, __LINE__, 0, |
| "can't get inode location %lu", |
| inode->i_ino); |
| return 0; |
| } |
| |
| down_read(&EXT4_I(inode)->xattr_sem); |
| max_inline_size = get_max_inline_xattr_value_size(inode, &iloc); |
| up_read(&EXT4_I(inode)->xattr_sem); |
| |
| brelse(iloc.bh); |
| |
| if (!max_inline_size) |
| return 0; |
| |
| return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE; |
| } |
| |
| /* |
| * this function does not take xattr_sem, which is OK because it is |
| * currently only used in a code path coming form ext4_iget, before |
| * the new inode has been unlocked |
| */ |
| int ext4_find_inline_data_nolock(struct inode *inode) |
| { |
| struct ext4_xattr_ibody_find is = { |
| .s = { .not_found = -ENODATA, }, |
| }; |
| struct ext4_xattr_info i = { |
| .name_index = EXT4_XATTR_INDEX_SYSTEM, |
| .name = EXT4_XATTR_SYSTEM_DATA, |
| }; |
| int error; |
| |
| if (EXT4_I(inode)->i_extra_isize == 0) |
| return 0; |
| |
| error = ext4_get_inode_loc(inode, &is.iloc); |
| if (error) |
| return error; |
| |
| error = ext4_xattr_ibody_find(inode, &i, &is); |
| if (error) |
| goto out; |
| |
| if (!is.s.not_found) { |
| if (is.s.here->e_value_inum) { |
| EXT4_ERROR_INODE(inode, "inline data xattr refers " |
| "to an external xattr inode"); |
| error = -EFSCORRUPTED; |
| goto out; |
| } |
| EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - |
| (void *)ext4_raw_inode(&is.iloc)); |
| EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + |
| le32_to_cpu(is.s.here->e_value_size); |
| ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
| } |
| out: |
| brelse(is.iloc.bh); |
| return error; |
| } |
| |
| static int ext4_read_inline_data(struct inode *inode, void *buffer, |
| unsigned int len, |
| struct ext4_iloc *iloc) |
| { |
| struct ext4_xattr_entry *entry; |
| struct ext4_xattr_ibody_header *header; |
| int cp_len = 0; |
| struct ext4_inode *raw_inode; |
| |
| if (!len) |
| return 0; |
| |
| BUG_ON(len > EXT4_I(inode)->i_inline_size); |
| |
| cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ? |
| len : EXT4_MIN_INLINE_DATA_SIZE; |
| |
| raw_inode = ext4_raw_inode(iloc); |
| memcpy(buffer, (void *)(raw_inode->i_block), cp_len); |
| |
| len -= cp_len; |
| buffer += cp_len; |
| |
| if (!len) |
| goto out; |
| |
| header = IHDR(inode, raw_inode); |
| entry = (struct ext4_xattr_entry *)((void *)raw_inode + |
| EXT4_I(inode)->i_inline_off); |
| len = min_t(unsigned int, len, |
| (unsigned int)le32_to_cpu(entry->e_value_size)); |
| |
| memcpy(buffer, |
| (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len); |
| cp_len += len; |
| |
| out: |
| return cp_len; |
| } |
| |
| /* |
| * write the buffer to the inline inode. |
| * If 'create' is set, we don't need to do the extra copy in the xattr |
| * value since it is already handled by ext4_xattr_ibody_inline_set. |
| * That saves us one memcpy. |
| */ |
| static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc, |
| void *buffer, loff_t pos, unsigned int len) |
| { |
| struct ext4_xattr_entry *entry; |
| struct ext4_xattr_ibody_header *header; |
| struct ext4_inode *raw_inode; |
| int cp_len = 0; |
| |
| if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
| return; |
| |
| BUG_ON(!EXT4_I(inode)->i_inline_off); |
| BUG_ON(pos + len > EXT4_I(inode)->i_inline_size); |
| |
| raw_inode = ext4_raw_inode(iloc); |
| buffer += pos; |
| |
| if (pos < EXT4_MIN_INLINE_DATA_SIZE) { |
| cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ? |
| EXT4_MIN_INLINE_DATA_SIZE - pos : len; |
| memcpy((void *)raw_inode->i_block + pos, buffer, cp_len); |
| |
| len -= cp_len; |
| buffer += cp_len; |
| pos += cp_len; |
| } |
| |
| if (!len) |
| return; |
| |
| pos -= EXT4_MIN_INLINE_DATA_SIZE; |
| header = IHDR(inode, raw_inode); |
| entry = (struct ext4_xattr_entry *)((void *)raw_inode + |
| EXT4_I(inode)->i_inline_off); |
| |
| memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos, |
| buffer, len); |
| } |
| |
| static int ext4_create_inline_data(handle_t *handle, |
| struct inode *inode, unsigned len) |
| { |
| int error; |
| void *value = NULL; |
| struct ext4_xattr_ibody_find is = { |
| .s = { .not_found = -ENODATA, }, |
| }; |
| struct ext4_xattr_info i = { |
| .name_index = EXT4_XATTR_INDEX_SYSTEM, |
| .name = EXT4_XATTR_SYSTEM_DATA, |
| }; |
| |
| error = ext4_get_inode_loc(inode, &is.iloc); |
| if (error) |
| return error; |
| |
| BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
| error = ext4_journal_get_write_access(handle, is.iloc.bh); |
| if (error) |
| goto out; |
| |
| if (len > EXT4_MIN_INLINE_DATA_SIZE) { |
| value = EXT4_ZERO_XATTR_VALUE; |
| len -= EXT4_MIN_INLINE_DATA_SIZE; |
| } else { |
| value = ""; |
| len = 0; |
| } |
| |
| /* Insert the the xttr entry. */ |
| i.value = value; |
| i.value_len = len; |
| |
| error = ext4_xattr_ibody_find(inode, &i, &is); |
| if (error) |
| goto out; |
| |
| BUG_ON(!is.s.not_found); |
| |
| error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
| if (error) { |
| if (error == -ENOSPC) |
| ext4_clear_inode_state(inode, |
| EXT4_STATE_MAY_INLINE_DATA); |
| goto out; |
| } |
| |
| memset((void *)ext4_raw_inode(&is.iloc)->i_block, |
| 0, EXT4_MIN_INLINE_DATA_SIZE); |
| |
| EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - |
| (void *)ext4_raw_inode(&is.iloc)); |
| EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE; |
| ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); |
| ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA); |
| get_bh(is.iloc.bh); |
| error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
| |
| out: |
| brelse(is.iloc.bh); |
| return error; |
| } |
| |
| static int ext4_update_inline_data(handle_t *handle, struct inode *inode, |
| unsigned int len) |
| { |
| int error; |
| void *value = NULL; |
| struct ext4_xattr_ibody_find is = { |
| .s = { .not_found = -ENODATA, }, |
| }; |
| struct ext4_xattr_info i = { |
| .name_index = EXT4_XATTR_INDEX_SYSTEM, |
| .name = EXT4_XATTR_SYSTEM_DATA, |
| }; |
| |
| /* If the old space is ok, write the data directly. */ |
| if (len <= EXT4_I(inode)->i_inline_size) |
| return 0; |
| |
| error = ext4_get_inode_loc(inode, &is.iloc); |
| if (error) |
| return error; |
| |
| error = ext4_xattr_ibody_find(inode, &i, &is); |
| if (error) |
| goto out; |
| |
| BUG_ON(is.s.not_found); |
| |
| len -= EXT4_MIN_INLINE_DATA_SIZE; |
| value = kzalloc(len, GFP_NOFS); |
| if (!value) { |
| error = -ENOMEM; |
| goto out; |
| } |
| |
| error = ext4_xattr_ibody_get(inode, i.name_index, i.name, |
| value, len); |
| if (error == -ENODATA) |
| goto out; |
| |
| BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
| error = ext4_journal_get_write_access(handle, is.iloc.bh); |
| if (error) |
| goto out; |
| |
| /* Update the xttr entry. */ |
| i.value = value; |
| i.value_len = len; |
| |
| error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
| if (error) |
| goto out; |
| |
| EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - |
| (void *)ext4_raw_inode(&is.iloc)); |
| EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + |
| le32_to_cpu(is.s.here->e_value_size); |
| ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
| get_bh(is.iloc.bh); |
| error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
| |
| out: |
| kfree(value); |
| brelse(is.iloc.bh); |
| return error; |
| } |
| |
| static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, |
| unsigned int len) |
| { |
| int ret, size, no_expand; |
| struct ext4_inode_info *ei = EXT4_I(inode); |
| |
| if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) |
| return -ENOSPC; |
| |
| size = ext4_get_max_inline_size(inode); |
| if (size < len) |
| return -ENOSPC; |
| |
| ext4_write_lock_xattr(inode, &no_expand); |
| |
| if (ei->i_inline_off) |
| ret = ext4_update_inline_data(handle, inode, len); |
| else |
| ret = ext4_create_inline_data(handle, inode, len); |
| |
| ext4_write_unlock_xattr(inode, &no_expand); |
| return ret; |
| } |
| |
| static int ext4_destroy_inline_data_nolock(handle_t *handle, |
| struct inode *inode) |
| { |
| struct ext4_inode_info *ei = EXT4_I(inode); |
| struct ext4_xattr_ibody_find is = { |
| .s = { .not_found = 0, }, |
| }; |
| struct ext4_xattr_info i = { |
| .name_index = EXT4_XATTR_INDEX_SYSTEM, |
| .name = EXT4_XATTR_SYSTEM_DATA, |
| .value = NULL, |
| .value_len = 0, |
| }; |
| int error; |
| |
| if (!ei->i_inline_off) |
| return 0; |
| |
| error = ext4_get_inode_loc(inode, &is.iloc); |
| if (error) |
| return error; |
| |
| error = ext4_xattr_ibody_find(inode, &i, &is); |
| if (error) |
| goto out; |
| |
| BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
| error = ext4_journal_get_write_access(handle, is.iloc.bh); |
| if (error) |
| goto out; |
| |
| error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
| if (error) |
| goto out; |
| |
| memset((void *)ext4_raw_inode(&is.iloc)->i_block, |
| 0, EXT4_MIN_INLINE_DATA_SIZE); |
| memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE); |
| |
| if (ext4_has_feature_extents(inode->i_sb)) { |
| if (S_ISDIR(inode->i_mode) || |
| S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) { |
| ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); |
| ext4_ext_tree_init(handle, inode); |
| } |
| } |
| ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA); |
| |
| get_bh(is.iloc.bh); |
| error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
| |
| EXT4_I(inode)->i_inline_off = 0; |
| EXT4_I(inode)->i_inline_size = 0; |
| ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
| out: |
| brelse(is.iloc.bh); |
| if (error == -ENODATA) |
| error = 0; |
| return error; |
| } |
| |
| static int ext4_read_inline_page(struct inode *inode, struct page *page) |
| { |
| void *kaddr; |
| int ret = 0; |
| size_t len; |
| struct ext4_iloc iloc; |
| |
| BUG_ON(!PageLocked(page)); |
| BUG_ON(!ext4_has_inline_data(inode)); |
| BUG_ON(page->index); |
| |
| if (!EXT4_I(inode)->i_inline_off) { |
| ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.", |
| inode->i_ino); |
| goto out; |
| } |
| |
| ret = ext4_get_inode_loc(inode, &iloc); |
| if (ret) |
| goto out; |
| |
| len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode)); |
| kaddr = kmap_atomic(page); |
| ret = ext4_read_inline_data(inode, kaddr, len, &iloc); |
| flush_dcache_page(page); |
| kunmap_atomic(kaddr); |
| zero_user_segment(page, len, PAGE_SIZE); |
| SetPageUptodate(page); |
| brelse(iloc.bh); |
| |
| out: |
| return ret; |
| } |
| |
| int ext4_readpage_inline(struct inode *inode, struct page *page) |
| { |
| int ret = 0; |
| |
| down_read(&EXT4_I(inode)->xattr_sem); |
| if (!ext4_has_inline_data(inode)) { |
| up_read(&EXT4_I(inode)->xattr_sem); |
| return -EAGAIN; |
| } |
| |
| /* |
| * Current inline data can only exist in the 1st page, |
| * So for all the other pages, just set them uptodate. |
| */ |
| if (!page->index) |
| ret = ext4_read_inline_page(inode, page); |
| else if (!PageUptodate(page)) { |
| zero_user_segment(page, 0, PAGE_SIZE); |
| SetPageUptodate(page); |
| } |
| |
| up_read(&EXT4_I(inode)->xattr_sem); |
| |
| unlock_page(page); |
| return ret >= 0 ? 0 : ret; |
| } |
| |
| static int ext4_convert_inline_data_to_extent(struct address_space *mapping, |
| struct inode *inode, |
| unsigned flags) |
| { |
| int ret, needed_blocks, no_expand; |
| handle_t *handle = NULL; |
| int retries = 0, sem_held = 0; |
| struct page *page = NULL; |
| unsigned from, to; |
| struct ext4_iloc iloc; |
| |
| if (!ext4_has_inline_data(inode)) { |
| /* |
| * clear the flag so that no new write |
| * will trap here again. |
| */ |
| ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
| return 0; |
| } |
| |
| needed_blocks = ext4_writepage_trans_blocks(inode); |
| |
| ret = ext4_get_inode_loc(inode, &iloc); |
| if (ret) |
| return ret; |
| |
| retry: |
| handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
| if (IS_ERR(handle)) { |
| ret = PTR_ERR(handle); |
| handle = NULL; |
| goto out; |
| } |
| |
| /* We cannot recurse into the filesystem as the transaction is already |
| * started */ |
| flags |= AOP_FLAG_NOFS; |
| |
| page = grab_cache_page_write_begin(mapping, 0, flags); |
| if (!page) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| ext4_write_lock_xattr(inode, &no_expand); |
| sem_held = 1; |
| /* If some one has already done this for us, just exit. */ |
| if (!ext4_has_inline_data(inode)) { |
| ret = 0; |
| goto out; |
| } |
| |
| from = 0; |
| to = ext4_get_inline_size(inode); |
| if (!PageUptodate(page)) { |
| ret = ext4_read_inline_page(inode, page); |
| if (ret < 0) |
| goto out; |
| } |
| |
| ret = ext4_destroy_inline_data_nolock(handle, inode); |
| if (ret) |
| goto out; |
| |
| if (ext4_should_dioread_nolock(inode)) { |
| ret = __block_write_begin(page, from, to, |
| ext4_get_block_unwritten); |
| } else |
| ret = __block_write_begin(page, from, to, ext4_get_block); |
| |
| if (!ret && ext4_should_journal_data(inode)) { |
| ret = ext4_walk_page_buffers(handle, page_buffers(page), |
| from, to, NULL, |
| do_journal_get_write_access); |
| } |
| |
| if (ret) { |
| unlock_page(page); |
| put_page(page); |
| page = NULL; |
| ext4_orphan_add(handle, inode); |
| ext4_write_unlock_xattr(inode, &no_expand); |
| sem_held = 0; |
| ext4_journal_stop(handle); |
| handle = NULL; |
| ext4_truncate_failed_write(inode); |
| /* |
| * If truncate failed early the inode might |
| * still be on the orphan list; we need to |
| * make sure the inode is removed from the |
| * orphan list in that case. |
| */ |
| if (inode->i_nlink) |
| ext4_orphan_del(NULL, inode); |
| } |
| |
| if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) |
| goto retry; |
| |
| if (page) |
| block_commit_write(page, from, to); |
| out: |
| if (page) { |
| unlock_page(page); |
| put_page(page); |
| } |
| if (sem_held) |
| ext4_write_unlock_xattr(inode, &no_expand); |
| if (handle) |
| ext4_journal_stop(handle); |
| brelse(iloc.bh); |
| return ret; |
| } |
| |
| /* |
| * Try to write data in the inode. |
| * If the inode has inline data, check whether the new write can be |
| * in the inode also. If not, create the page the handle, move the data |
| * to the page make it update and let the later codes create extent for it. |
| */ |
| int ext4_try_to_write_inline_data(struct address_space *mapping, |
| struct inode *inode, |
| loff_t pos, unsigned len, |
| unsigned flags, |
| struct page **pagep) |
| { |
| int ret; |
| handle_t *handle; |
| struct page *page; |
| struct ext4_iloc iloc; |
| |
| if (pos + len > ext4_get_max_inline_size(inode)) |
| goto convert; |
| |
| ret = ext4_get_inode_loc(inode, &iloc); |
| if (ret) |
| return ret; |
| |
| /* |
| * The possible write could happen in the inode, |
| * so try to reserve the space in inode first. |
| */ |
| handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
| if (IS_ERR(handle)) { |
| ret = PTR_ERR(handle); |
| handle = NULL; |
| goto out; |
| } |
| |
| ret = ext4_prepare_inline_data(handle, inode, pos + len); |
| if (ret && ret != -ENOSPC) |
| goto out; |
| |
| /* We don't have space in inline inode, so convert it to extent. */ |
| if (ret == -ENOSPC) { |
| ext4_journal_stop(handle); |
| brelse(iloc.bh); |
| goto convert; |
| } |
| |
| ret = ext4_journal_get_write_access(handle, iloc.bh); |
| if (ret) |
| goto out; |
| |
| flags |= AOP_FLAG_NOFS; |
| |
| page = grab_cache_page_write_begin(mapping, 0, flags); |
| if (!page) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| *pagep = page; |
| down_read(&EXT4_I(inode)->xattr_sem); |
| if (!ext4_has_inline_data(inode)) { |
| ret = 0; |
| unlock_page(page); |
| put_page(page); |
| goto out_up_read; |
| } |
| |
| if (!PageUptodate(page)) { |
| ret = ext4_read_inline_page(inode, page); |
| if (ret < 0) { |
| unlock_page(page); |
| put_page(page); |
| goto out_up_read; |
| } |
| } |
| |
| ret = 1; |
| handle = NULL; |
| out_up_read: |
| up_read(&EXT4_I(inode)->xattr_sem); |
| out: |
| if (handle && (ret != 1)) |
| ext4_journal_stop(handle); |
| brelse(iloc.bh); |
| return ret; |
| convert: |
| return ext4_convert_inline_data_to_extent(mapping, |
| inode, flags); |
| } |
| |
| int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, |
| unsigned copied, struct page *page) |
| { |
| int ret, no_expand; |
| void *kaddr; |
| struct ext4_iloc iloc; |
| |
| if (unlikely(copied < len)) { |
| if (!PageUptodate(page)) { |
| copied = 0; |
| goto out; |
| } |
| } |
| |
| ret = ext4_get_inode_loc(inode, &iloc); |
| if (ret) { |
| ext4_std_error(inode->i_sb, ret); |
| copied = 0; |
| goto out; |
| } |
| |
| ext4_write_lock_xattr(inode, &no_expand); |
| BUG_ON(!ext4_has_inline_data(inode)); |
| |
| /* |
| * ei->i_inline_off may have changed since ext4_write_begin() |
| * called ext4_try_to_write_inline_data() |
| */ |
| (void) ext4_find_inline_data_nolock(inode); |
| |
| kaddr = kmap_atomic(page); |
| ext4_write_inline_data(inode, &iloc, kaddr, pos, len); |
| kunmap_atomic(kaddr); |
| SetPageUptodate(page); |
| /* clear page dirty so that writepages wouldn't work for us. */ |
| ClearPageDirty(page); |
| |
| ext4_write_unlock_xattr(inode, &no_expand); |
| brelse(iloc.bh); |
| mark_inode_dirty(inode); |
| out: |
| return copied; |
| } |
| |
| struct buffer_head * |
| ext4_journalled_write_inline_data(struct inode *inode, |
| unsigned len, |
| struct page *page) |
| { |
| int ret, no_expand; |
| void *kaddr; |
| struct ext4_iloc iloc; |
| |
| ret = ext4_get_inode_loc(inode, &iloc); |
| if (ret) { |
| ext4_std_error(inode->i_sb, ret); |
| return NULL; |
| } |
| |
| ext4_write_lock_xattr(inode, &no_expand); |
| kaddr = kmap_atomic(page); |
| ext4_write_inline_data(inode, &iloc, kaddr, 0, len); |
| kunmap_atomic(kaddr); |
| ext4_write_unlock_xattr(inode, &no_expand); |
| |
| return iloc.bh; |
| } |
| |
| /* |
| * Try to make the page cache and handle ready for the inline data case. |
| * We can call this function in 2 cases: |
| * 1. The inode is created and the first write exceeds inline size. We can |
| * clear the inode state safely. |
| * 2. The inode has inline data, then we need to read the data, make it |
| * update and dirty so that ext4_da_writepages can handle it. We don't |
| * need to start the journal since the file's metatdata isn't changed now. |
| */ |
| static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping, |
| struct inode *inode, |
| unsigned flags, |
| void **fsdata) |
| { |
| int ret = 0, inline_size; |
| struct page *page; |
| |
| page = grab_cache_page_write_begin(mapping, 0, flags); |
| if (!page) |
| return -ENOMEM; |
| |
| down_read(&EXT4_I(inode)->xattr_sem); |
| if (!ext4_has_inline_data(inode)) { |
| ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
| goto out; |
| } |
| |
| inline_size = ext4_get_inline_size(inode); |
| |
| if (!PageUptodate(page)) { |
| ret = ext4_read_inline_page(inode, page); |
| if (ret < 0) |
| goto out; |
| } |
| |
| ret = __block_write_begin(page, 0, inline_size, |
| ext4_da_get_block_prep); |
| if (ret) { |
| up_read(&EXT4_I(inode)->xattr_sem); |
| unlock_page(page); |
| put_page(page); |
| ext4_truncate_failed_write(inode); |
| return ret; |
| } |
| |
| SetPageDirty(page); |
| SetPageUptodate(page); |
| ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
| *fsdata = (void *)CONVERT_INLINE_DATA; |
| |
| out: |
| up_read(&EXT4_I(inode)->xattr_sem); |
| if (page) { |
| unlock_page(page); |
| put_page(page); |
| } |
| return ret; |
| } |
| |
| /* |
| * Prepare the write for the inline data. |
| * If the the data can be written into the inode, we just read |
| * the page and make it uptodate, and start the journal. |
| * Otherwise read the page, makes it dirty so that it can be |
| * handle in writepages(the i_disksize update is left to the |
| * normal ext4_da_write_end). |
| */ |
| int ext4_da_write_inline_data_begin(struct address_space *mapping, |
| struct inode *inode, |
| loff_t pos, unsigned len, |
| unsigned flags, |
| struct page **pagep, |
| void **fsdata) |
| { |
| int ret, inline_size; |
| handle_t *handle; |
| struct page *page; |
| struct ext4_iloc iloc; |
| int retries = 0; |
| |
| ret = ext4_get_inode_loc(inode, &iloc); |
| if (ret) |
| return ret; |
| |
| retry_journal: |
| handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
| if (IS_ERR(handle)) { |
| ret = PTR_ERR(handle); |
| goto out; |
| } |
| |
| inline_size = ext4_get_max_inline_size(inode); |
| |
| ret = -ENOSPC; |
| if (inline_size >= pos + len) { |
| ret = ext4_prepare_inline_data(handle, inode, pos + len); |
| if (ret && ret != -ENOSPC) |
| goto out_journal; |
| } |
| |
| /* |
| * We cannot recurse into the filesystem as the transaction |
| * is already started. |
| */ |
| flags |= AOP_FLAG_NOFS; |
| |
| if (ret == -ENOSPC) { |
| ext4_journal_stop(handle); |
| ret = ext4_da_convert_inline_data_to_extent(mapping, |
| inode, |
| flags, |
| fsdata); |
| if (ret == -ENOSPC && |
| ext4_should_retry_alloc(inode->i_sb, &retries)) |
| goto retry_journal; |
| goto out; |
| } |
| |
| page = grab_cache_page_write_begin(mapping, 0, flags); |
| if (!page) { |
| ret = -ENOMEM; |
| goto out_journal; |
| } |
| |
| down_read(&EXT4_I(inode)->xattr_sem); |
| if (!ext4_has_inline_data(inode)) { |
| ret = 0; |
| goto out_release_page; |
| } |
| |
| if (!PageUptodate(page)) { |
| ret = ext4_read_inline_page(inode, page); |
| if (ret < 0) |
| goto out_release_page; |
| } |
| ret = ext4_journal_get_write_access(handle, iloc.bh); |
| if (ret) |
| goto out_release_page; |
| |
| up_read(&EXT4_I(inode)->xattr_sem); |
| *pagep = page; |
| brelse(iloc.bh); |
| return 1; |
| out_release_page: |
| up_read(&EXT4_I(inode)->xattr_sem); |
| unlock_page(page); |
| put_page(page); |
| out_journal: |
| ext4_journal_stop(handle); |
| out: |
| brelse(iloc.bh); |
| return ret; |
| } |
| |
| int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, |
| unsigned len, unsigned copied, |
| struct page *page) |
| { |
| int ret; |
| |
| ret = ext4_write_inline_data_end(inode, pos, len, copied, page); |
| if (ret < 0) { |
| unlock_page(page); |
| put_page(page); |
| return ret; |
| } |
| copied = ret; |
| |
| /* |
| * No need to use i_size_read() here, the i_size |
| * cannot change under us because we hold i_mutex. |
| * |
| * But it's important to update i_size while still holding page lock: |
| * page writeout could otherwise come in and zero beyond i_size. |
| */ |
| if (pos+copied > inode->i_size) |
| i_size_write(inode, pos+copied); |
| unlock_page(page); |
| put_page(page); |
| |
| /* |
| * Don't mark the inode dirty under page lock. First, it unnecessarily |
| * makes the holding time of page lock longer. Second, it forces lock |
| * ordering of page lock and transaction start for journaling |
| * filesystems. |
| */ |
| mark_inode_dirty(inode); |
| |
| return copied; |
| } |
| |
| #ifdef INLINE_DIR_DEBUG |
| void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh, |
| void *inline_start, int inline_size) |
| { |
| int offset; |
| unsigned short de_len; |
| struct ext4_dir_entry_2 *de = inline_start; |
| void *dlimit = inline_start + inline_size; |
| |
| trace_printk("inode %lu\n", dir->i_ino); |
| offset = 0; |
| while ((void *)de < dlimit) { |
| de_len = ext4_rec_len_from_disk(de->rec_len, inline_size); |
| trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n", |
| offset, de_len, de->name_len, de->name, |
| de->name_len, le32_to_cpu(de->inode)); |
| if (ext4_check_dir_entry(dir, NULL, de, bh, |
| inline_start, inline_size, offset)) |
| BUG(); |
| |
| offset += de_len; |
| de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); |
| } |
| } |
| #else |
| #define ext4_show_inline_dir(dir, bh, inline_start, inline_size) |
| #endif |
| |
| /* |
| * Add a new entry into a inline dir. |
| * It will return -ENOSPC if no space is available, and -EIO |
| * and -EEXIST if directory entry already exists. |
| */ |
| static int ext4_add_dirent_to_inline(handle_t *handle, |
| struct ext4_filename *fname, |
| struct inode *dir, |
| struct inode *inode, |
| struct ext4_iloc *iloc, |
| void *inline_start, int inline_size) |
| { |
| int err; |
| struct ext4_dir_entry_2 *de; |
| |
| err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start, |
| inline_size, fname, &de); |
| if (err) |
| return err; |
| |
| BUFFER_TRACE(iloc->bh, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, iloc->bh); |
| if (err) |
| return err; |
| ext4_insert_dentry(inode, de, inline_size, fname); |
| |
| ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size); |
| |
| /* |
| * XXX shouldn't update any times until successful |
| * completion of syscall, but too many callers depend |
| * on this. |
| * |
| * XXX similarly, too many callers depend on |
| * ext4_new_inode() setting the times, but error |
| * recovery deletes the inode, so the worst that can |
| * happen is that the times are slightly out of date |
| * and/or different from the directory change time. |
| */ |
| dir->i_mtime = dir->i_ctime = current_time(dir); |
| ext4_update_dx_flag(dir); |
| inode_inc_iversion(dir); |
| return 1; |
| } |
| |
| static void *ext4_get_inline_xattr_pos(struct inode *inode, |
| struct ext4_iloc *iloc) |
| { |
| struct ext4_xattr_entry *entry; |
| struct ext4_xattr_ibody_header *header; |
| |
| BUG_ON(!EXT4_I(inode)->i_inline_off); |
| |
| header = IHDR(inode, ext4_raw_inode(iloc)); |
| entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) + |
| EXT4_I(inode)->i_inline_off); |
| |
| return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs); |
| } |
| |
| /* Set the final de to cover the whole block. */ |
| static void ext4_update_final_de(void *de_buf, int old_size, int new_size) |
| { |
| struct ext4_dir_entry_2 *de, *prev_de; |
| void *limit; |
| int de_len; |
| |
| de = (struct ext4_dir_entry_2 *)de_buf; |
| if (old_size) { |
| limit = de_buf + old_size; |
| do { |
| prev_de = de; |
| de_len = ext4_rec_len_from_disk(de->rec_len, old_size); |
| de_buf += de_len; |
| de = (struct ext4_dir_entry_2 *)de_buf; |
| } while (de_buf < limit); |
| |
| prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size - |
| old_size, new_size); |
| } else { |
| /* this is just created, so create an empty entry. */ |
| de->inode = 0; |
| de->rec_len = ext4_rec_len_to_disk(new_size, new_size); |
| } |
| } |
| |
| static int ext4_update_inline_dir(handle_t *handle, struct inode *dir, |
| struct ext4_iloc *iloc) |
| { |
| int ret; |
| int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE; |
| int new_size = get_max_inline_xattr_value_size(dir, iloc); |
| |
| if (new_size - old_size <= EXT4_DIR_REC_LEN(1)) |
| return -ENOSPC; |
| |
| ret = ext4_update_inline_data(handle, dir, |
| new_size + EXT4_MIN_INLINE_DATA_SIZE); |
| if (ret) |
| return ret; |
| |
| ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size, |
| EXT4_I(dir)->i_inline_size - |
| EXT4_MIN_INLINE_DATA_SIZE); |
| dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size; |
| return 0; |
| } |
| |
| static void ext4_restore_inline_data(handle_t *handle, struct inode *inode, |
| struct ext4_iloc *iloc, |
| void *buf, int inline_size) |
| { |
| ext4_create_inline_data(handle, inode, inline_size); |
| ext4_write_inline_data(inode, iloc, buf, 0, inline_size); |
| ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
| } |
| |
| static int ext4_finish_convert_inline_dir(handle_t *handle, |
| struct inode *inode, |
| struct buffer_head *dir_block, |
| void *buf, |
| int inline_size) |
| { |
| int err, csum_size = 0, header_size = 0; |
| struct ext4_dir_entry_2 *de; |
| void *target = dir_block->b_data; |
| |
| /* |
| * First create "." and ".." and then copy the dir information |
| * back to the block. |
| */ |
| de = (struct ext4_dir_entry_2 *)target; |
| de = ext4_init_dot_dotdot(inode, de, |
| inode->i_sb->s_blocksize, csum_size, |
| le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1); |
| header_size = (void *)de - target; |
| |
| memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE, |
| inline_size - EXT4_INLINE_DOTDOT_SIZE); |
| |
| if (ext4_has_metadata_csum(inode->i_sb)) |
| csum_size = sizeof(struct ext4_dir_entry_tail); |
| |
| inode->i_size = inode->i_sb->s_blocksize; |
| i_size_write(inode, inode->i_sb->s_blocksize); |
| EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize; |
| ext4_update_final_de(dir_block->b_data, |
| inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size, |
| inode->i_sb->s_blocksize - csum_size); |
| |
| if (csum_size) |
| ext4_initialize_dirent_tail(dir_block, |
| inode->i_sb->s_blocksize); |
| set_buffer_uptodate(dir_block); |
| err = ext4_handle_dirty_dirblock(handle, inode, dir_block); |
| if (err) |
| return err; |
| set_buffer_verified(dir_block); |
| return ext4_mark_inode_dirty(handle, inode); |
| } |
| |
| static int ext4_convert_inline_data_nolock(handle_t *handle, |
| struct inode *inode, |
| struct ext4_iloc *iloc) |
| { |
| int error; |
| void *buf = NULL; |
| struct buffer_head *data_bh = NULL; |
| struct ext4_map_blocks map; |
| int inline_size; |
| |
| inline_size = ext4_get_inline_size(inode); |
| buf = kmalloc(inline_size, GFP_NOFS); |
| if (!buf) { |
| error = -ENOMEM; |
| goto out; |
| } |
| |
| error = ext4_read_inline_data(inode, buf, inline_size, iloc); |
| if (error < 0) |
| goto out; |
| |
| /* |
| * Make sure the inline directory entries pass checks before we try to |
| * convert them, so that we avoid touching stuff that needs fsck. |
| */ |
| if (S_ISDIR(inode->i_mode)) { |
| error = ext4_check_all_de(inode, iloc->bh, |
| buf + EXT4_INLINE_DOTDOT_SIZE, |
| inline_size - EXT4_INLINE_DOTDOT_SIZE); |
| if (error) |
| goto out; |
| } |
| |
| error = ext4_destroy_inline_data_nolock(handle, inode); |
| if (error) |
| goto out; |
| |
| map.m_lblk = 0; |
| map.m_len = 1; |
| map.m_flags = 0; |
| error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE); |
| if (error < 0) |
| goto out_restore; |
| if (!(map.m_flags & EXT4_MAP_MAPPED)) { |
| error = -EIO; |
| goto out_restore; |
| } |
| |
| data_bh = sb_getblk(inode->i_sb, map.m_pblk); |
| if (!data_bh) { |
| error = -ENOMEM; |
| goto out_restore; |
| } |
| |
| lock_buffer(data_bh); |
| error = ext4_journal_get_create_access(handle, data_bh); |
| if (error) { |
| unlock_buffer(data_bh); |
| error = -EIO; |
| goto out_restore; |
| } |
| memset(data_bh->b_data, 0, inode->i_sb->s_blocksize); |
| |
| if (!S_ISDIR(inode->i_mode)) { |
| memcpy(data_bh->b_data, buf, inline_size); |
| set_buffer_uptodate(data_bh); |
| error = ext4_handle_dirty_metadata(handle, |
| inode, data_bh); |
| } else { |
| error = ext4_finish_convert_inline_dir(handle, inode, data_bh, |
| buf, inline_size); |
| } |
| |
| unlock_buffer(data_bh); |
| out_restore: |
| if (error) |
| ext4_restore_inline_data(handle, inode, iloc, buf, inline_size); |
| |
| out: |
| brelse(data_bh); |
| kfree(buf); |
| return error; |
| } |
| |
| /* |
| * Try to add the new entry to the inline data. |
| * If succeeds, return 0. If not, extended the inline dir and copied data to |
| * the new created block. |
| */ |
| int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname, |
| struct inode *dir, struct inode *inode) |
| { |
| int ret, inline_size, no_expand; |
| void *inline_start; |
| struct ext4_iloc iloc; |
| |
| ret = ext4_get_inode_loc(dir, &iloc); |
| if (ret) |
| return ret; |
| |
| ext4_write_lock_xattr(dir, &no_expand); |
| if (!ext4_has_inline_data(dir)) |
| goto out; |
| |
| inline_start = (void *)ext4_raw_inode(&iloc)->i_block + |
| EXT4_INLINE_DOTDOT_SIZE; |
| inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; |
| |
| ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc, |
| inline_start, inline_size); |
| if (ret != -ENOSPC) |
| goto out; |
| |
| /* check whether it can be inserted to inline xattr space. */ |
| inline_size = EXT4_I(dir)->i_inline_size - |
| EXT4_MIN_INLINE_DATA_SIZE; |
| if (!inline_size) { |
| /* Try to use the xattr space.*/ |
| ret = ext4_update_inline_dir(handle, dir, &iloc); |
| if (ret && ret != -ENOSPC) |
| goto out; |
| |
| inline_size = EXT4_I(dir)->i_inline_size - |
| EXT4_MIN_INLINE_DATA_SIZE; |
| } |
| |
| if (inline_size) { |
| inline_start = ext4_get_inline_xattr_pos(dir, &iloc); |
| |
| ret = ext4_add_dirent_to_inline(handle, fname, dir, |
| inode, &iloc, inline_start, |
| inline_size); |
| |
| if (ret != -ENOSPC) |
| goto out; |
| } |
| |
| /* |
| * The inline space is filled up, so create a new block for it. |
| * As the extent tree will be created, we have to save the inline |
| * dir first. |
| */ |
| ret = ext4_convert_inline_data_nolock(handle, dir, &iloc); |
| |
| out: |
| ext4_write_unlock_xattr(dir, &no_expand); |
| ext4_mark_inode_dirty(handle, dir); |
| brelse(iloc.bh); |
| return ret; |
| } |
| |
| /* |
| * This function fills a red-black tree with information from an |
| * inlined dir. It returns the number directory entries loaded |
| * into the tree. If there is an error it is returned in err. |
| */ |
| int ext4_inlinedir_to_tree(struct file *dir_file, |
| struct inode *dir, ext4_lblk_t block, |
| struct dx_hash_info *hinfo, |
| __u32 start_hash, __u32 start_minor_hash, |
| int *has_inline_data) |
| { |
| int err = 0, count = 0; |
| unsigned int parent_ino; |
| int pos; |
| struct ext4_dir_entry_2 *de; |
| struct inode *inode = file_inode(dir_file); |
| int ret, inline_size = 0; |
| struct ext4_iloc iloc; |
| void *dir_buf = NULL; |
| struct ext4_dir_entry_2 fake; |
| struct fscrypt_str tmp_str; |
| |
| ret = ext4_get_inode_loc(inode, &iloc); |
| if (ret) |
| return ret; |
| |
| down_read(&EXT4_I(inode)->xattr_sem); |
| if (!ext4_has_inline_data(inode)) { |
| up_read(&EXT4_I(inode)->xattr_sem); |
| *has_inline_data = 0; |
| goto out; |
| } |
| |
| inline_size = ext4_get_inline_size(inode); |
| dir_buf = kmalloc(inline_size, GFP_NOFS); |
| if (!dir_buf) { |
| ret = -ENOMEM; |
| up_read(&EXT4_I(inode)->xattr_sem); |
| goto out; |
| } |
| |
| ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc); |
| up_read(&EXT4_I(inode)->xattr_sem); |
| if (ret < 0) |
| goto out; |
| |
| pos = 0; |
| parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); |
| while (pos < inline_size) { |
| /* |
| * As inlined dir doesn't store any information about '.' and |
| * only the inode number of '..' is stored, we have to handle |
| * them differently. |
| */ |
| if (pos == 0) { |
| fake.inode = cpu_to_le32(inode->i_ino); |
| fake.name_len = 1; |
| strcpy(fake.name, "."); |
| fake.rec_len = ext4_rec_len_to_disk( |
| EXT4_DIR_REC_LEN(fake.name_len), |
| inline_size); |
| ext4_set_de_type(inode->i_sb, &fake, S_IFDIR); |
| de = &fake; |
| pos = EXT4_INLINE_DOTDOT_OFFSET; |
| } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) { |
| fake.inode = cpu_to_le32(parent_ino); |
| fake.name_len = 2; |
| strcpy(fake.name, ".."); |
| fake.rec_len = ext4_rec_len_to_disk( |
| EXT4_DIR_REC_LEN(fake.name_len), |
| inline_size); |
| ext4_set_de_type(inode->i_sb, &fake, S_IFDIR); |
| de = &fake; |
| pos = EXT4_INLINE_DOTDOT_SIZE; |
| } else { |
| de = (struct ext4_dir_entry_2 *)(dir_buf + pos); |
| pos += ext4_rec_len_from_disk(de->rec_len, inline_size); |
| if (ext4_check_dir_entry(inode, dir_file, de, |
| iloc.bh, dir_buf, |
| inline_size, pos)) { |
| ret = count; |
| goto out; |
| } |
| } |
| |
| ext4fs_dirhash(dir, de->name, de->name_len, hinfo); |
| if ((hinfo->hash < start_hash) || |
| ((hinfo->hash == start_hash) && |
| (hinfo->minor_hash < start_minor_hash))) |
| continue; |
| if (de->inode == 0) |
| continue; |
| tmp_str.name = de->name; |
| tmp_str.len = de->name_len; |
| err = ext4_htree_store_dirent(dir_file, hinfo->hash, |
| hinfo->minor_hash, de, &tmp_str); |
| if (err) { |
| ret = err; |
| goto out; |
| } |
| count++; |
| } |
| ret = count; |
| out: |
| kfree(dir_buf); |
| brelse(iloc.bh); |
| return ret; |
| } |
| |
| /* |
| * So this function is called when the volume is mkfsed with |
| * dir_index disabled. In order to keep f_pos persistent |
| * after we convert from an inlined dir to a blocked based, |
| * we just pretend that we are a normal dir and return the |
| * offset as if '.' and '..' really take place. |
| * |
| */ |
| int ext4_read_inline_dir(struct file *file, |
| struct dir_context *ctx, |
| int *has_inline_data) |
| { |
| unsigned int offset, parent_ino; |
| int i; |
| struct ext4_dir_entry_2 *de; |
| struct super_block *sb; |
| struct inode *inode = file_inode(file); |
| int ret, inline_size = 0; |
| struct ext4_iloc iloc; |
| void *dir_buf = NULL; |
| int dotdot_offset, dotdot_size, extra_offset, extra_size; |
| |
| ret = ext4_get_inode_loc(inode, &iloc); |
| if (ret) |
| return ret; |
| |
| down_read(&EXT4_I(inode)->xattr_sem); |
| if (!ext4_has_inline_data(inode)) { |
| up_read(&EXT4_I(inode)->xattr_sem); |
| *has_inline_data = 0; |
| goto out; |
| } |
| |
| inline_size = ext4_get_inline_size(inode); |
| dir_buf = kmalloc(inline_size, GFP_NOFS); |
| if (!dir_buf) { |
| ret = -ENOMEM; |
| up_read(&EXT4_I(inode)->xattr_sem); |
| goto out; |
| } |
| |
| ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc); |
| up_read(&EXT4_I(inode)->xattr_sem); |
| if (ret < 0) |
| goto out; |
| |
| ret = 0; |
| sb = inode->i_sb; |
| parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); |
| offset = ctx->pos; |
| |
| /* |
| * dotdot_offset and dotdot_size is the real offset and |
| * size for ".." and "." if the dir is block based while |
| * the real size for them are only EXT4_INLINE_DOTDOT_SIZE. |
| * So we will use extra_offset and extra_size to indicate them |
| * during the inline dir iteration. |
| */ |
| dotdot_offset = EXT4_DIR_REC_LEN(1); |
| dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2); |
| extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE; |
| extra_size = extra_offset + inline_size; |
| |
| /* |
| * If the version has changed since the last call to |
| * readdir(2), then we might be pointing to an invalid |
| * dirent right now. Scan from the start of the inline |
| * dir to make sure. |
| */ |
| if (!inode_eq_iversion(inode, file->f_version)) { |
| for (i = 0; i < extra_size && i < offset;) { |
| /* |
| * "." is with offset 0 and |
| * ".." is dotdot_offset. |
| */ |
| if (!i) { |
| i = dotdot_offset; |
| continue; |
| } else if (i == dotdot_offset) { |
| i = dotdot_size; |
| continue; |
| } |
| /* for other entry, the real offset in |
| * the buf has to be tuned accordingly. |
| */ |
| de = (struct ext4_dir_entry_2 *) |
| (dir_buf + i - extra_offset); |
| /* It's too expensive to do a full |
| * dirent test each time round this |
| * loop, but we do have to test at |
| * least that it is non-zero. A |
| * failure will be detected in the |
| * dirent test below. */ |
| if (ext4_rec_len_from_disk(de->rec_len, extra_size) |
| < EXT4_DIR_REC_LEN(1)) |
| break; |
| i += ext4_rec_len_from_disk(de->rec_len, |
| extra_size); |
| } |
| offset = i; |
| ctx->pos = offset; |
| file->f_version = inode_query_iversion(inode); |
| } |
| |
| while (ctx->pos < extra_size) { |
| if (ctx->pos == 0) { |
| if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR)) |
| goto out; |
| ctx->pos = dotdot_offset; |
| continue; |
| } |
| |
| if (ctx->pos == dotdot_offset) { |
| if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR)) |
| goto out; |
| ctx->pos = dotdot_size; |
| continue; |
| } |
| |
| de = (struct ext4_dir_entry_2 *) |
| (dir_buf + ctx->pos - extra_offset); |
| if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf, |
| extra_size, ctx->pos)) |
| goto out; |
| if (le32_to_cpu(de->inode)) { |
| if (!dir_emit(ctx, de->name, de->name_len, |
| le32_to_cpu(de->inode), |
| get_dtype(sb, de->file_type))) |
| goto out; |
| } |
| ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size); |
| } |
| out: |
| kfree(dir_buf); |
| brelse(iloc.bh); |
| return ret; |
| } |
| |
| struct buffer_head *ext4_get_first_inline_block(struct inode *inode, |
| struct ext4_dir_entry_2 **parent_de, |
| int *retval) |
| { |
| struct ext4_iloc iloc; |
| |
| *retval = ext4_get_inode_loc(inode, &iloc); |
| if (*retval) |
| return NULL; |
| |
| *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; |
| |
| return iloc.bh; |
| } |
| |
| /* |
| * Try to create the inline data for the new dir. |
| * If it succeeds, return 0, otherwise return the error. |
| * In case of ENOSPC, the caller should create the normal disk layout dir. |
| */ |
| int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent, |
| struct inode *inode) |
| { |
| int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE; |
| struct ext4_iloc iloc; |
| struct ext4_dir_entry_2 *de; |
| |
| ret = ext4_get_inode_loc(inode, &iloc); |
| if (ret) |
| return ret; |
| |
| ret = ext4_prepare_inline_data(handle, inode, inline_size); |
| if (ret) |
| goto out; |
| |
| /* |
| * For inline dir, we only save the inode information for the ".." |
| * and create a fake dentry to cover the left space. |
| */ |
| de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; |
| de->inode = cpu_to_le32(parent->i_ino); |
| de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE); |
| de->inode = 0; |
| de->rec_len = ext4_rec_len_to_disk( |
| inline_size - EXT4_INLINE_DOTDOT_SIZE, |
| inline_size); |
| set_nlink(inode, 2); |
| inode->i_size = EXT4_I(inode)->i_disksize = inline_size; |
| out: |
| brelse(iloc.bh); |
| return ret; |
| } |
| |
| struct buffer_head *ext4_find_inline_entry(struct inode *dir, |
| struct ext4_filename *fname, |
| struct ext4_dir_entry_2 **res_dir, |
| int *has_inline_data) |
| { |
| int ret; |
| struct ext4_iloc iloc; |
| void *inline_start; |
| int inline_size; |
| |
| if (ext4_get_inode_loc(dir, &iloc)) |
| return NULL; |
| |
| down_read(&EXT4_I(dir)->xattr_sem); |
| if (!ext4_has_inline_data(dir)) { |
| *has_inline_data = 0; |
| goto out; |
| } |
| |
| inline_start = (void *)ext4_raw_inode(&iloc)->i_block + |
| EXT4_INLINE_DOTDOT_SIZE; |
| inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; |
| ret = ext4_search_dir(iloc.bh, inline_start, inline_size, |
| dir, fname, 0, res_dir); |
| if (ret == 1) |
| goto out_find; |
| if (ret < 0) |
| goto out; |
| |
| if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE) |
| goto out; |
| |
| inline_start = ext4_get_inline_xattr_pos(dir, &iloc); |
| inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE; |
| |
| ret = ext4_search_dir(iloc.bh, inline_start, inline_size, |
| dir, fname, 0, res_dir); |
| if (ret == 1) |
| goto out_find; |
| |
| out: |
| brelse(iloc.bh); |
| iloc.bh = NULL; |
| out_find: |
| up_read(&EXT4_I(dir)->xattr_sem); |
| return iloc.bh; |
| } |
| |
| int ext4_delete_inline_entry(handle_t *handle, |
| struct inode *dir, |
| struct ext4_dir_entry_2 *de_del, |
| struct buffer_head *bh, |
| int *has_inline_data) |
| { |
| int err, inline_size, no_expand; |
| struct ext4_iloc iloc; |
| void *inline_start; |
| |
| err = ext4_get_inode_loc(dir, &iloc); |
| if (err) |
| return err; |
| |
| ext4_write_lock_xattr(dir, &no_expand); |
| if (!ext4_has_inline_data(dir)) { |
| *has_inline_data = 0; |
| goto out; |
| } |
| |
| if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) < |
| EXT4_MIN_INLINE_DATA_SIZE) { |
| inline_start = (void *)ext4_raw_inode(&iloc)->i_block + |
| EXT4_INLINE_DOTDOT_SIZE; |
| inline_size = EXT4_MIN_INLINE_DATA_SIZE - |
| EXT4_INLINE_DOTDOT_SIZE; |
| } else { |
| inline_start = ext4_get_inline_xattr_pos(dir, &iloc); |
| inline_size = ext4_get_inline_size(dir) - |
| EXT4_MIN_INLINE_DATA_SIZE; |
| } |
| |
| BUFFER_TRACE(bh, "get_write_access"); |
| err = ext4_journal_get_write_access(handle, bh); |
| if (err) |
| goto out; |
| |
| err = ext4_generic_delete_entry(handle, dir, de_del, bh, |
| inline_start, inline_size, 0); |
| if (err) |
| goto out; |
| |
| ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size); |
| out: |
| ext4_write_unlock_xattr(dir, &no_expand); |
| if (likely(err == 0)) |
| err = ext4_mark_inode_dirty(handle, dir); |
| brelse(iloc.bh); |
| if (err != -ENOENT) |
| ext4_std_error(dir->i_sb, err); |
| return err; |
| } |
| |
| /* |
| * Get the inline dentry at offset. |
| */ |
| static inline struct ext4_dir_entry_2 * |
| ext4_get_inline_entry(struct inode *inode, |
| struct ext4_iloc *iloc, |
| unsigned int offset, |
| void **inline_start, |
| int *inline_size) |
| { |
| void *inline_pos; |
| |
| BUG_ON(offset > ext4_get_inline_size(inode)); |
| |
| if (offset < EXT4_MIN_INLINE_DATA_SIZE) { |
| inline_pos = (void *)ext4_raw_inode(iloc)->i_block; |
| *inline_size = EXT4_MIN_INLINE_DATA_SIZE; |
| } else { |
| inline_pos = ext4_get_inline_xattr_pos(inode, iloc); |
| offset -= EXT4_MIN_INLINE_DATA_SIZE; |
| *inline_size = ext4_get_inline_size(inode) - |
| EXT4_MIN_INLINE_DATA_SIZE; |
| } |
| |
| if (inline_start) |
| *inline_start = inline_pos; |
| return (struct ext4_dir_entry_2 *)(inline_pos + offset); |
| } |
| |
| bool empty_inline_dir(struct inode *dir, int *has_inline_data) |
| { |
| int err, inline_size; |
| struct ext4_iloc iloc; |
| size_t inline_len; |
| void *inline_pos; |
| unsigned int offset; |
| struct ext4_dir_entry_2 *de; |
| bool ret = true; |
| |
| err = ext4_get_inode_loc(dir, &iloc); |
| if (err) { |
| EXT4_ERROR_INODE(dir, "error %d getting inode %lu block", |
| err, dir->i_ino); |
| return true; |
| } |
| |
| down_read(&EXT4_I(dir)->xattr_sem); |
| if (!ext4_has_inline_data(dir)) { |
| *has_inline_data = 0; |
| goto out; |
| } |
| |
| de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; |
| if (!le32_to_cpu(de->inode)) { |
| ext4_warning(dir->i_sb, |
| "bad inline directory (dir #%lu) - no `..'", |
| dir->i_ino); |
| ret = true; |
| goto out; |
| } |
| |
| inline_len = ext4_get_inline_size(dir); |
| offset = EXT4_INLINE_DOTDOT_SIZE; |
| while (offset < inline_len) { |
| de = ext4_get_inline_entry(dir, &iloc, offset, |
| &inline_pos, &inline_size); |
| if (ext4_check_dir_entry(dir, NULL, de, |
| iloc.bh, inline_pos, |
| inline_size, offset)) { |
| ext4_warning(dir->i_sb, |
| "bad inline directory (dir #%lu) - " |
| "inode %u, rec_len %u, name_len %d" |
| "inline size %d", |
| dir->i_ino, le32_to_cpu(de->inode), |
| le16_to_cpu(de->rec_len), de->name_len, |
| inline_size); |
| ret = true; |
| goto out; |
| } |
| if (le32_to_cpu(de->inode)) { |
| ret = false; |
| goto out; |
| } |
| offset += ext4_rec_len_from_disk(de->rec_len, inline_size); |
| } |
| |
| out: |
| up_read(&EXT4_I(dir)->xattr_sem); |
| brelse(iloc.bh); |
| return ret; |
| } |
| |
| int ext4_destroy_inline_data(handle_t *handle, struct inode *inode) |
| { |
| int ret, no_expand; |
| |
| ext4_write_lock_xattr(inode, &no_expand); |
| ret = ext4_destroy_inline_data_nolock(handle, inode); |
| ext4_write_unlock_xattr(inode, &no_expand); |
| |
| return ret; |
| } |
| |
| int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap) |
| { |
| __u64 addr; |
| int error = -EAGAIN; |
| struct ext4_iloc iloc; |
| |
| down_read(&EXT4_I(inode)->xattr_sem); |
| if (!ext4_has_inline_data(inode)) |
| goto out; |
| |
| error = ext4_get_inode_loc(inode, &iloc); |
| if (error) |
| goto out; |
| |
| addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits; |
| addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data; |
| addr += offsetof(struct ext4_inode, i_block); |
| |
| brelse(iloc.bh); |
| |
| iomap->addr = addr; |
| iomap->offset = 0; |
| iomap->length = min_t(loff_t, ext4_get_inline_size(inode), |
| i_size_read(inode)); |
| iomap->type = IOMAP_INLINE; |
| iomap->flags = 0; |
| |
| out: |
| up_read(&EXT4_I(inode)->xattr_sem); |
| return error; |
| } |
| |
| int ext4_inline_data_fiemap(struct inode *inode, |
| struct fiemap_extent_info *fieinfo, |
| int *has_inline, __u64 start, __u64 len) |
| { |
| __u64 physical = 0; |
| __u64 inline_len; |
| __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED | |
| FIEMAP_EXTENT_LAST; |
| int error = 0; |
| struct ext4_iloc iloc; |
| |
| down_read(&EXT4_I(inode)->xattr_sem); |
| if (!ext4_has_inline_data(inode)) { |
| *has_inline = 0; |
| goto out; |
| } |
| inline_len = min_t(size_t, ext4_get_inline_size(inode), |
| i_size_read(inode)); |
| if (start >= inline_len) |
| goto out; |
| if (start + len < inline_len) |
| inline_len = start + len; |
| inline_len -= start; |
| |
| error = ext4_get_inode_loc(inode, &iloc); |
| if (error) |
| goto out; |
| |
| physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits; |
| physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data; |
| physical += offsetof(struct ext4_inode, i_block); |
| |
| brelse(iloc.bh); |
| out: |
| up_read(&EXT4_I(inode)->xattr_sem); |
| if (physical) |
| error = fiemap_fill_next_extent(fieinfo, start, physical, |
| inline_len, flags); |
| return (error < 0 ? error : 0); |
| } |
| |
| int ext4_inline_data_truncate(struct inode *inode, int *has_inline) |
| { |
| handle_t *handle; |
| int inline_size, value_len, needed_blocks, no_expand, err = 0; |
| size_t i_size; |
| void *value = NULL; |
| struct ext4_xattr_ibody_find is = { |
| .s = { .not_found = -ENODATA, }, |
| }; |
| struct ext4_xattr_info i = { |
| .name_index = EXT4_XATTR_INDEX_SYSTEM, |
| .name = EXT4_XATTR_SYSTEM_DATA, |
| }; |
| |
| |
| needed_blocks = ext4_writepage_trans_blocks(inode); |
| handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| |
| ext4_write_lock_xattr(inode, &no_expand); |
| if (!ext4_has_inline_data(inode)) { |
| ext4_write_unlock_xattr(inode, &no_expand); |
| *has_inline = 0; |
| ext4_journal_stop(handle); |
| return 0; |
| } |
| |
| if ((err = ext4_orphan_add(handle, inode)) != 0) |
| goto out; |
| |
| if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0) |
| goto out; |
| |
| down_write(&EXT4_I(inode)->i_data_sem); |
| i_size = inode->i_size; |
| inline_size = ext4_get_inline_size(inode); |
| EXT4_I(inode)->i_disksize = i_size; |
| |
| if (i_size < inline_size) { |
| /* Clear the content in the xattr space. */ |
| if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) { |
| if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0) |
| goto out_error; |
| |
| BUG_ON(is.s.not_found); |
| |
| value_len = le32_to_cpu(is.s.here->e_value_size); |
| value = kmalloc(value_len, GFP_NOFS); |
| if (!value) { |
| err = -ENOMEM; |
| goto out_error; |
| } |
| |
| err = ext4_xattr_ibody_get(inode, i.name_index, |
| i.name, value, value_len); |
| if (err <= 0) |
| goto out_error; |
| |
| i.value = value; |
| i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ? |
| i_size - EXT4_MIN_INLINE_DATA_SIZE : 0; |
| err = ext4_xattr_ibody_inline_set(handle, inode, |
| &i, &is); |
| if (err) |
| goto out_error; |
| } |
| |
| /* Clear the content within i_blocks. */ |
| if (i_size < EXT4_MIN_INLINE_DATA_SIZE) { |
| void *p = (void *) ext4_raw_inode(&is.iloc)->i_block; |
| memset(p + i_size, 0, |
| EXT4_MIN_INLINE_DATA_SIZE - i_size); |
| } |
| |
| EXT4_I(inode)->i_inline_size = i_size < |
| EXT4_MIN_INLINE_DATA_SIZE ? |
| EXT4_MIN_INLINE_DATA_SIZE : i_size; |
| } |
| |
| out_error: |
| up_write(&EXT4_I(inode)->i_data_sem); |
| out: |
| brelse(is.iloc.bh); |
| ext4_write_unlock_xattr(inode, &no_expand); |
| kfree(value); |
| if (inode->i_nlink) |
| ext4_orphan_del(handle, inode); |
| |
| if (err == 0) { |
| inode->i_mtime = inode->i_ctime = current_time(inode); |
| err = ext4_mark_inode_dirty(handle, inode); |
| if (IS_SYNC(inode)) |
| ext4_handle_sync(handle); |
| } |
| ext4_journal_stop(handle); |
| return err; |
| } |
| |
| int ext4_convert_inline_data(struct inode *inode) |
| { |
| int error, needed_blocks, no_expand; |
| handle_t *handle; |
| struct ext4_iloc iloc; |
| |
| if (!ext4_has_inline_data(inode)) { |
| ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
| return 0; |
| } |
| |
| needed_blocks = ext4_writepage_trans_blocks(inode); |
| |
| iloc.bh = NULL; |
| error = ext4_get_inode_loc(inode, &iloc); |
| if (error) |
| return error; |
| |
| handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
| if (IS_ERR(handle)) { |
| error = PTR_ERR(handle); |
| goto out_free; |
| } |
| |
| ext4_write_lock_xattr(inode, &no_expand); |
| if (ext4_has_inline_data(inode)) |
| error = ext4_convert_inline_data_nolock(handle, inode, &iloc); |
| ext4_write_unlock_xattr(inode, &no_expand); |
| ext4_journal_stop(handle); |
| out_free: |
| brelse(iloc.bh); |
| return error; |
| } |