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>
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 890bb28d..d74cc33 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -470,6 +470,10 @@
{
int node_secs = get_blocktype_secs(sbi, F2FS_DIRTY_NODES);
int dent_secs = get_blocktype_secs(sbi, F2FS_DIRTY_DENTS);
+
+ if (test_opt(sbi, LFS))
+ return false;
+
return free_sections(sbi) <= (node_secs + 2 * dent_secs +
reserved_sections(sbi) + 1);
}
@@ -533,6 +537,9 @@
if (S_ISDIR(inode->i_mode) || f2fs_is_atomic_file(inode))
return false;
+ if (test_opt(sbi, LFS))
+ return false;
+
if (policy & (0x1 << F2FS_IPU_FORCE))
return true;
if (policy & (0x1 << F2FS_IPU_SSR) && need_SSR(sbi))