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f2fs: skip unnecessary data writes during fsync 

This patch intends to improve the fsync performance by skipping remaining the
recovery information, only when there is no data that we should recover.

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2014-07-24 19:08:02 -07:00
parent fff04f90c1
commit 6d99ba41a7
1 changed files with 18 additions and 0 deletions
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18
fs/f2fs/file.c
View File

@ -133,6 +133,17 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
return ret;
}
/*
* if there is no written data, don't waste time to write recovery info.
*/
if (!is_inode_flag_set(fi, FI_APPEND_WRITE) &&
!exist_written_data(sbi, inode->i_ino, APPEND_INO)) {
if (is_inode_flag_set(fi, FI_UPDATE_WRITE) ||
exist_written_data(sbi, inode->i_ino, UPDATE_INO))
goto flush_out;
goto out;
}
/* guarantee free sections for fsync */
f2fs_balance_fs(sbi);
@ -188,6 +199,13 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
ret = wait_on_node_pages_writeback(sbi, inode->i_ino);
if (ret)
goto out;
/* once recovery info is written, don't need to tack this */
remove_dirty_inode(sbi, inode->i_ino, APPEND_INO);
clear_inode_flag(fi, FI_APPEND_WRITE);
flush_out:
remove_dirty_inode(sbi, inode->i_ino, UPDATE_INO);
clear_inode_flag(fi, FI_UPDATE_WRITE);
ret = f2fs_issue_flush(F2FS_SB(inode->i_sb));
}
out: