f2fs: key functions to handle inline data
Functions to implement inline data read/write, and move inline data to
normal data block when file size exceeds inline data limitation.
Signed-off-by: Huajun Li <huajun.li@intel.com>
Signed-off-by: Haicheng Li <haicheng.li@linux.intel.com>
Signed-off-by: Weihong Xu <weihong.xu@intel.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/Makefile b/fs/f2fs/Makefile
index 27a0820..2e35da1 100644
--- a/fs/f2fs/Makefile
+++ b/fs/f2fs/Makefile
@@ -1,6 +1,6 @@
obj-$(CONFIG_F2FS_FS) += f2fs.o
-f2fs-y := dir.o file.o inode.o namei.o hash.o super.o
+f2fs-y := dir.o file.o inode.o namei.o hash.o super.o inline.o
f2fs-y += checkpoint.o gc.o data.o node.o segment.o recovery.o
f2fs-$(CONFIG_F2FS_STAT_FS) += debug.o
f2fs-$(CONFIG_F2FS_FS_XATTR) += xattr.o
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 36211cb..b01ccaa 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1296,4 +1296,12 @@
extern const struct inode_operations f2fs_symlink_inode_operations;
extern const struct inode_operations f2fs_special_inode_operations;
+/*
+ * inline.c
+ */
+inline int f2fs_has_inline_data(struct inode *);
+bool f2fs_may_inline(struct inode *);
+int f2fs_read_inline_data(struct inode *, struct page *);
+int f2fs_convert_inline_data(struct inode *, struct page *, unsigned);
+int f2fs_write_inline_data(struct inode *, struct page *, unsigned int);
#endif
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
new file mode 100644
index 0000000..62c72aa
--- /dev/null
+++ b/fs/f2fs/inline.c
@@ -0,0 +1,176 @@
+/*
+ * 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"
+
+inline int f2fs_has_inline_data(struct inode *inode)
+{
+ return is_inode_flag_set(F2FS_I(inode), FI_INLINE_DATA);
+}
+
+bool f2fs_may_inline(struct inode *inode)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
+ block_t nr_blocks;
+ loff_t i_size;
+
+ if (!test_opt(sbi, INLINE_DATA))
+ return false;
+
+ nr_blocks = F2FS_I(inode)->i_xattr_nid ? 3 : 2;
+ if (inode->i_blocks > nr_blocks)
+ return false;
+
+ i_size = i_size_read(inode);
+ if (i_size > MAX_INLINE_DATA)
+ return false;
+
+ return true;
+}
+
+int f2fs_read_inline_data(struct inode *inode, struct page *page)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
+ struct page *ipage;
+ void *src_addr, *dst_addr;
+
+ ipage = get_node_page(sbi, inode->i_ino);
+ if (IS_ERR(ipage))
+ return PTR_ERR(ipage);
+
+ zero_user_segment(page, INLINE_DATA_OFFSET,
+ INLINE_DATA_OFFSET + MAX_INLINE_DATA);
+
+ /* Copy the whole inline data block */
+ src_addr = inline_data_addr(ipage);
+ dst_addr = kmap(page);
+ memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
+ kunmap(page);
+ f2fs_put_page(ipage, 1);
+
+ SetPageUptodate(page);
+ unlock_page(page);
+
+ return 0;
+}
+
+static int __f2fs_convert_inline_data(struct inode *inode, struct page *page)
+{
+ int err;
+ struct page *ipage;
+ struct dnode_of_data dn;
+ void *src_addr, *dst_addr;
+ block_t new_blk_addr;
+ struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
+ struct f2fs_io_info fio = {
+ .type = DATA,
+ .rw = WRITE_SYNC | REQ_PRIO,
+ };
+
+ f2fs_lock_op(sbi);
+ ipage = get_node_page(sbi, inode->i_ino);
+ if (IS_ERR(ipage))
+ return PTR_ERR(ipage);
+
+ /*
+ * i_addr[0] is not used for inline data,
+ * so reserving new block will not destroy inline data
+ */
+ set_new_dnode(&dn, inode, ipage, ipage, 0);
+ err = f2fs_reserve_block(&dn, 0);
+ if (err) {
+ f2fs_put_page(ipage, 1);
+ f2fs_unlock_op(sbi);
+ return err;
+ }
+
+ zero_user_segment(page, 0, PAGE_CACHE_SIZE);
+
+ /* Copy the whole inline data block */
+ src_addr = inline_data_addr(ipage);
+ dst_addr = kmap(page);
+ memcpy(dst_addr, src_addr, MAX_INLINE_DATA);
+ kunmap(page);
+
+ /* write data page to try to make data consistent */
+ set_page_writeback(page);
+ write_data_page(page, &dn, &new_blk_addr, &fio);
+ update_extent_cache(new_blk_addr, &dn);
+ f2fs_wait_on_page_writeback(page, DATA, true);
+
+ /* clear inline data and flag after data writeback */
+ zero_user_segment(ipage, INLINE_DATA_OFFSET,
+ INLINE_DATA_OFFSET + MAX_INLINE_DATA);
+ clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
+
+ sync_inode_page(&dn);
+ f2fs_put_page(ipage, 1);
+ f2fs_unlock_op(sbi);
+
+ return err;
+}
+
+int f2fs_convert_inline_data(struct inode *inode,
+ struct page *p, unsigned flags)
+{
+ int err;
+ struct page *page;
+
+ if (!p || p->index) {
+ page = grab_cache_page_write_begin(inode->i_mapping, 0, flags);
+ if (IS_ERR(page))
+ return PTR_ERR(page);
+ } else {
+ page = p;
+ }
+
+ err = __f2fs_convert_inline_data(inode, page);
+
+ if (!p || p->index)
+ f2fs_put_page(page, 1);
+
+ return err;
+}
+
+int f2fs_write_inline_data(struct inode *inode,
+ struct page *page, unsigned size)
+{
+ void *src_addr, *dst_addr;
+ struct page *ipage;
+ 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;
+ ipage = dn.inode_page;
+
+ zero_user_segment(ipage, INLINE_DATA_OFFSET,
+ INLINE_DATA_OFFSET + MAX_INLINE_DATA);
+ src_addr = kmap(page);
+ dst_addr = inline_data_addr(ipage);
+ memcpy(dst_addr, src_addr, size);
+ kunmap(page);
+
+ /* Release the first data block if it is allocated */
+ if (!f2fs_has_inline_data(inode)) {
+ truncate_data_blocks_range(&dn, 1);
+ set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
+ }
+
+ sync_inode_page(&dn);
+ f2fs_put_dnode(&dn);
+
+ return 0;
+}