Initial import

1 files changed, 532 insertions, 0 deletions

diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
new file mode 100644
index 000000000..8140e4f0e
--- /dev/null
+++ b/fs/f2fs/inline.c
@@ -0,0 +1,532 @@
+/*
+ * fs/f2fs/inline.c
+ * Copyright (c) 2013, Intel Corporation
+ * Authors: Huajun Li <huajun.li@intel.com>
+ *          Haicheng Li <haicheng.li@intel.com>
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/fs.h>
+#include <linux/f2fs_fs.h>
+
+#include "f2fs.h"
+
+bool f2fs_may_inline(struct inode *inode)
+{
+	if (!test_opt(F2FS_I_SB(inode), INLINE_DATA))
+		return false;
+
+	if (f2fs_is_atomic_file(inode))
+		return false;
+
+	if (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode))
+		return false;
+
+	if (i_size_read(inode) > MAX_INLINE_DATA)
+		return false;
+
+	return true;
+}
+
+void read_inline_data(struct page *page, struct page *ipage)
+{
+	void *src_addr, *dst_addr;
+
+	if (PageUptodate(page))
+		return;
+
+	f2fs_bug_on(F2FS_P_SB(page), page->index);
+
+	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
+
+	/* Copy the whole inline data block */
+	src_addr = inline_data_addr(ipage);
+	dst_addr = kmap_atomic(page);
+	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
+	flush_dcache_page(page);
+	kunmap_atomic(dst_addr);
+	SetPageUptodate(page);
+}
+
+bool truncate_inline_inode(struct page *ipage, u64 from)
+{
+	void *addr;
+
+	if (from >= MAX_INLINE_DATA)
+		return false;
+
+	addr = inline_data_addr(ipage);
+
+	f2fs_wait_on_page_writeback(ipage, NODE);
+	memset(addr + from, 0, MAX_INLINE_DATA - from);
+
+	return true;
+}
+
+int f2fs_read_inline_data(struct inode *inode, struct page *page)
+{
+	struct page *ipage;
+
+	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
+	if (IS_ERR(ipage)) {
+		unlock_page(page);
+		return PTR_ERR(ipage);
+	}
+
+	if (!f2fs_has_inline_data(inode)) {
+		f2fs_put_page(ipage, 1);
+		return -EAGAIN;
+	}
+
+	if (page->index)
+		zero_user_segment(page, 0, PAGE_CACHE_SIZE);
+	else
+		read_inline_data(page, ipage);
+
+	SetPageUptodate(page);
+	f2fs_put_page(ipage, 1);
+	unlock_page(page);
+	return 0;
+}
+
+int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
+{
+	void *src_addr, *dst_addr;
+	struct f2fs_io_info fio = {
+		.type = DATA,
+		.rw = WRITE_SYNC | REQ_PRIO,
+	};
+	int dirty, err;
+
+	f2fs_bug_on(F2FS_I_SB(dn->inode), page->index);
+
+	if (!f2fs_exist_data(dn->inode))
+		goto clear_out;
+
+	err = f2fs_reserve_block(dn, 0);
+	if (err)
+		return err;
+
+	f2fs_wait_on_page_writeback(page, DATA);
+
+	if (PageUptodate(page))
+		goto no_update;
+
+	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
+
+	/* Copy the whole inline data block */
+	src_addr = inline_data_addr(dn->inode_page);
+	dst_addr = kmap_atomic(page);
+	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
+	flush_dcache_page(page);
+	kunmap_atomic(dst_addr);
+	SetPageUptodate(page);
+no_update:
+	/* clear dirty state */
+	dirty = clear_page_dirty_for_io(page);
+
+	/* write data page to try to make data consistent */
+	set_page_writeback(page);
+	fio.blk_addr = dn->data_blkaddr;
+	write_data_page(page, dn, &fio);
+	set_data_blkaddr(dn);
+	f2fs_update_extent_cache(dn);
+	f2fs_wait_on_page_writeback(page, DATA);
+	if (dirty)
+		inode_dec_dirty_pages(dn->inode);
+
+	/* this converted inline_data should be recovered. */
+	set_inode_flag(F2FS_I(dn->inode), FI_APPEND_WRITE);
+
+	/* clear inline data and flag after data writeback */
+	truncate_inline_inode(dn->inode_page, 0);
+clear_out:
+	stat_dec_inline_inode(dn->inode);
+	f2fs_clear_inline_inode(dn->inode);
+	sync_inode_page(dn);
+	f2fs_put_dnode(dn);
+	return 0;
+}
+
+int f2fs_convert_inline_inode(struct inode *inode)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct dnode_of_data dn;
+	struct page *ipage, *page;
+	int err = 0;
+
+	page = grab_cache_page(inode->i_mapping, 0);
+	if (!page)
+		return -ENOMEM;
+
+	f2fs_lock_op(sbi);
+
+	ipage = get_node_page(sbi, inode->i_ino);
+	if (IS_ERR(ipage)) {
+		err = PTR_ERR(ipage);
+		goto out;
+	}
+
+	set_new_dnode(&dn, inode, ipage, ipage, 0);
+
+	if (f2fs_has_inline_data(inode))
+		err = f2fs_convert_inline_page(&dn, page);
+
+	f2fs_put_dnode(&dn);
+out:
+	f2fs_unlock_op(sbi);
+
+	f2fs_put_page(page, 1);
+	return err;
+}
+
+int f2fs_write_inline_data(struct inode *inode, struct page *page)
+{
+	void *src_addr, *dst_addr;
+	struct dnode_of_data dn;
+	int err;
+
+	set_new_dnode(&dn, inode, NULL, NULL, 0);
+	err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
+	if (err)
+		return err;
+
+	if (!f2fs_has_inline_data(inode)) {
+		f2fs_put_dnode(&dn);
+		return -EAGAIN;
+	}
+
+	f2fs_bug_on(F2FS_I_SB(inode), page->index);
+
+	f2fs_wait_on_page_writeback(dn.inode_page, NODE);
+	src_addr = kmap_atomic(page);
+	dst_addr = inline_data_addr(dn.inode_page);
+	memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
+	kunmap_atomic(src_addr);
+
+	set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
+	set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
+
+	sync_inode_page(&dn);
+	f2fs_put_dnode(&dn);
+	return 0;
+}
+
+bool recover_inline_data(struct inode *inode, struct page *npage)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct f2fs_inode *ri = NULL;
+	void *src_addr, *dst_addr;
+	struct page *ipage;
+
+	/*
+	 * The inline_data recovery policy is as follows.
+	 * [prev.] [next] of inline_data flag
+	 *    o       o  -> recover inline_data
+	 *    o       x  -> remove inline_data, and then recover data blocks
+	 *    x       o  -> remove inline_data, and then recover inline_data
+	 *    x       x  -> recover data blocks
+	 */
+	if (IS_INODE(npage))
+		ri = F2FS_INODE(npage);
+
+	if (f2fs_has_inline_data(inode) &&
+			ri && (ri->i_inline & F2FS_INLINE_DATA)) {
+process_inline:
+		ipage = get_node_page(sbi, inode->i_ino);
+		f2fs_bug_on(sbi, IS_ERR(ipage));
+
+		f2fs_wait_on_page_writeback(ipage, NODE);
+
+		src_addr = inline_data_addr(npage);
+		dst_addr = inline_data_addr(ipage);
+		memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
+
+		set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
+		set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
+
+		update_inode(inode, ipage);
+		f2fs_put_page(ipage, 1);
+		return true;
+	}
+
+	if (f2fs_has_inline_data(inode)) {
+		ipage = get_node_page(sbi, inode->i_ino);
+		f2fs_bug_on(sbi, IS_ERR(ipage));
+		truncate_inline_inode(ipage, 0);
+		f2fs_clear_inline_inode(inode);
+		update_inode(inode, ipage);
+		f2fs_put_page(ipage, 1);
+	} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
+		truncate_blocks(inode, 0, false);
+		goto process_inline;
+	}
+	return false;
+}
+
+struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
+				struct qstr *name, struct page **res_page)
+{
+	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
+	struct f2fs_inline_dentry *inline_dentry;
+	struct f2fs_dir_entry *de;
+	struct f2fs_dentry_ptr d;
+	struct page *ipage;
+
+	ipage = get_node_page(sbi, dir->i_ino);
+	if (IS_ERR(ipage))
+		return NULL;
+
+	inline_dentry = inline_data_addr(ipage);
+
+	make_dentry_ptr(&d, (void *)inline_dentry, 2);
+	de = find_target_dentry(name, NULL, &d);
+
+	unlock_page(ipage);
+	if (de)
+		*res_page = ipage;
+	else
+		f2fs_put_page(ipage, 0);
+
+	/*
+	 * For the most part, it should be a bug when name_len is zero.
+	 * We stop here for figuring out where the bugs has occurred.
+	 */
+	f2fs_bug_on(sbi, d.max < 0);
+	return de;
+}
+
+struct f2fs_dir_entry *f2fs_parent_inline_dir(struct inode *dir,
+							struct page **p)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
+	struct page *ipage;
+	struct f2fs_dir_entry *de;
+	struct f2fs_inline_dentry *dentry_blk;
+
+	ipage = get_node_page(sbi, dir->i_ino);
+	if (IS_ERR(ipage))
+		return NULL;
+
+	dentry_blk = inline_data_addr(ipage);
+	de = &dentry_blk->dentry[1];
+	*p = ipage;
+	unlock_page(ipage);
+	return de;
+}
+
+int make_empty_inline_dir(struct inode *inode, struct inode *parent,
+							struct page *ipage)
+{
+	struct f2fs_inline_dentry *dentry_blk;
+	struct f2fs_dentry_ptr d;
+
+	dentry_blk = inline_data_addr(ipage);
+
+	make_dentry_ptr(&d, (void *)dentry_blk, 2);
+	do_make_empty_dir(inode, parent, &d);
+
+	set_page_dirty(ipage);
+
+	/* update i_size to MAX_INLINE_DATA */
+	if (i_size_read(inode) < MAX_INLINE_DATA) {
+		i_size_write(inode, MAX_INLINE_DATA);
+		set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
+	}
+	return 0;
+}
+
+static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
+				struct f2fs_inline_dentry *inline_dentry)
+{
+	struct page *page;
+	struct dnode_of_data dn;
+	struct f2fs_dentry_block *dentry_blk;
+	int err;
+
+	page = grab_cache_page(dir->i_mapping, 0);
+	if (!page)
+		return -ENOMEM;
+
+	set_new_dnode(&dn, dir, ipage, NULL, 0);
+	err = f2fs_reserve_block(&dn, 0);
+	if (err)
+		goto out;
+
+	f2fs_wait_on_page_writeback(page, DATA);
+	zero_user_segment(page, 0, PAGE_CACHE_SIZE);
+
+	dentry_blk = kmap_atomic(page);
+
+	/* copy data from inline dentry block to new dentry block */
+	memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
+					INLINE_DENTRY_BITMAP_SIZE);
+	memcpy(dentry_blk->dentry, inline_dentry->dentry,
+			sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
+	memcpy(dentry_blk->filename, inline_dentry->filename,
+					NR_INLINE_DENTRY * F2FS_SLOT_LEN);
+
+	kunmap_atomic(dentry_blk);
+	SetPageUptodate(page);
+	set_page_dirty(page);
+
+	/* clear inline dir and flag after data writeback */
+	truncate_inline_inode(ipage, 0);
+
+	stat_dec_inline_dir(dir);
+	clear_inode_flag(F2FS_I(dir), FI_INLINE_DENTRY);
+
+	if (i_size_read(dir) < PAGE_CACHE_SIZE) {
+		i_size_write(dir, PAGE_CACHE_SIZE);
+		set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
+	}
+
+	sync_inode_page(&dn);
+out:
+	f2fs_put_page(page, 1);
+	return err;
+}
+
+int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
+			struct inode *inode, nid_t ino, umode_t mode)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
+	struct page *ipage;
+	unsigned int bit_pos;
+	f2fs_hash_t name_hash;
+	size_t namelen = name->len;
+	struct f2fs_inline_dentry *dentry_blk = NULL;
+	struct f2fs_dentry_ptr d;
+	int slots = GET_DENTRY_SLOTS(namelen);
+	struct page *page = NULL;
+	int err = 0;
+
+	ipage = get_node_page(sbi, dir->i_ino);
+	if (IS_ERR(ipage))
+		return PTR_ERR(ipage);
+
+	dentry_blk = inline_data_addr(ipage);
+	bit_pos = room_for_filename(&dentry_blk->dentry_bitmap,
+						slots, NR_INLINE_DENTRY);
+	if (bit_pos >= NR_INLINE_DENTRY) {
+		err = f2fs_convert_inline_dir(dir, ipage, dentry_blk);
+		if (!err)
+			err = -EAGAIN;
+		goto out;
+	}
+
+	if (inode) {
+		down_write(&F2FS_I(inode)->i_sem);
+		page = init_inode_metadata(inode, dir, name, ipage);
+		if (IS_ERR(page)) {
+			err = PTR_ERR(page);
+			goto fail;
+		}
+	}
+
+	f2fs_wait_on_page_writeback(ipage, NODE);
+
+	name_hash = f2fs_dentry_hash(name);
+	make_dentry_ptr(&d, (void *)dentry_blk, 2);
+	f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);
+
+	set_page_dirty(ipage);
+
+	/* we don't need to mark_inode_dirty now */
+	if (inode) {
+		F2FS_I(inode)->i_pino = dir->i_ino;
+		update_inode(inode, page);
+		f2fs_put_page(page, 1);
+	}
+
+	update_parent_metadata(dir, inode, 0);
+fail:
+	if (inode)
+		up_write(&F2FS_I(inode)->i_sem);
+
+	if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
+		update_inode(dir, ipage);
+		clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
+	}
+out:
+	f2fs_put_page(ipage, 1);
+	return err;
+}
+
+void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
+					struct inode *dir, struct inode *inode)
+{
+	struct f2fs_inline_dentry *inline_dentry;
+	int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
+	unsigned int bit_pos;
+	int i;
+
+	lock_page(page);
+	f2fs_wait_on_page_writeback(page, NODE);
+
+	inline_dentry = inline_data_addr(page);
+	bit_pos = dentry - inline_dentry->dentry;
+	for (i = 0; i < slots; i++)
+		test_and_clear_bit_le(bit_pos + i,
+				&inline_dentry->dentry_bitmap);
+
+	set_page_dirty(page);
+
+	dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+
+	if (inode)
+		f2fs_drop_nlink(dir, inode, page);
+
+	f2fs_put_page(page, 1);
+}
+
+bool f2fs_empty_inline_dir(struct inode *dir)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
+	struct page *ipage;
+	unsigned int bit_pos = 2;
+	struct f2fs_inline_dentry *dentry_blk;
+
+	ipage = get_node_page(sbi, dir->i_ino);
+	if (IS_ERR(ipage))
+		return false;
+
+	dentry_blk = inline_data_addr(ipage);
+	bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
+					NR_INLINE_DENTRY,
+					bit_pos);
+
+	f2fs_put_page(ipage, 1);
+
+	if (bit_pos < NR_INLINE_DENTRY)
+		return false;
+
+	return true;
+}
+
+int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx)
+{
+	struct inode *inode = file_inode(file);
+	struct f2fs_inline_dentry *inline_dentry = NULL;
+	struct page *ipage = NULL;
+	struct f2fs_dentry_ptr d;
+
+	if (ctx->pos == NR_INLINE_DENTRY)
+		return 0;
+
+	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
+	if (IS_ERR(ipage))
+		return PTR_ERR(ipage);
+
+	inline_dentry = inline_data_addr(ipage);
+
+	make_dentry_ptr(&d, (void *)inline_dentry, 2);
+
+	if (!f2fs_fill_dentries(ctx, &d, 0))
+		ctx->pos = NR_INLINE_DENTRY;
+
+	f2fs_put_page(ipage, 1);
+	return 0;
+}