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 (file)
--- 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 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1296,4 +1296,12 @@ extern const struct inode_operations f2fs_dir_inode_operations;
 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 (file)
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;
+}