Commit 36abef4e authored Jun 03, 2016 by Jaegeuk Kim

f2fs: introduce mode=lfs mount option



This mount option is to enable original log-structured filesystem forcefully.
So, there should be no random writes for main area.

Especially, this supports host-managed SMR device.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent aa987273

Documentation/filesystems/f2fs.txt

+3 −0

Original line number	Diff line number	Diff line
		@@ -151,6 +151,9 @@ noinline_data Disable the inline data feature, inline data feature is
		enabled by default.
		data_flush Enable data flushing before checkpoint in order to
		persist data of regular and symlink.
		mode=%s Control block allocation mode which supports "adaptive"
		and "lfs". In "lfs" mode, there should be no random
		writes towards main area.

		================================================================================
		DEBUGFS ENTRIES

fs/f2fs/checkpoint.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -981,7 +981,7 @@ static int do_checkpoint(struct f2fs_sb_info sbi, struct cp_control cpc)
		* This avoids to conduct wrong roll-forward operations and uses
		* metapages, so should be called prior to sync_meta_pages below.
		*/
		if (discard_next_dnode(sbi, discard_blk))
		if (!test_opt(sbi, LFS) && discard_next_dnode(sbi, discard_blk))
		invalidate = true;

		/* Flush all the NAT/SIT pages */

fs/f2fs/data.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1710,6 +1710,8 @@ static ssize_t f2fs_direct_IO(struct kiocb iocb, struct iov_iter iter)

		if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
		return 0;
		if (test_opt(F2FS_I_SB(inode), LFS))
		return 0;

		trace_f2fs_direct_IO_enter(inode, offset, count, iov_iter_rw(iter));

fs/f2fs/f2fs.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -111,6 +111,8 @@ static inline bool time_to_inject(int type)
		#define F2FS_MOUNT_FORCE_FG_GC 0x00004000
		#define F2FS_MOUNT_DATA_FLUSH 0x00008000
		#define F2FS_MOUNT_FAULT_INJECTION 0x00010000
		#define F2FS_MOUNT_ADAPTIVE 0x00020000
		#define F2FS_MOUNT_LFS 0x00040000

		#define clear_opt(sbi, option) (sbi->mount_opt.opt &= ~F2FS_MOUNT_##option)
		#define set_opt(sbi, option) (sbi->mount_opt.opt \|= F2FS_MOUNT_##option)

fs/f2fs/file.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -878,9 +878,15 @@ static int __exchange_data_block(struct inode *inode, pgoff_t src,
		return full ? truncate_hole(inode, dst, dst + 1) : 0;

		if (do_replace) {
		struct page *ipage = get_node_page(sbi, inode->i_ino);
		struct page *ipage;
		struct node_info ni;

		if (test_opt(sbi, LFS)) {
		ret = -ENOTSUPP;
		goto err_out;
		}

		ipage = get_node_page(sbi, inode->i_ino);
		if (IS_ERR(ipage)) {
		ret = PTR_ERR(ipage);
		goto err_out;