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f2fs: add nodiscard mount option 

This patch adds 'nodiscard' mount option.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

 Conflicts:
	Documentation/filesystems/f2fs.txt
This commit is contained in:
Chao Yu 2016-07-03 22:05:14 +08:00 committed by Jaegeuk Kim
parent 3a4806bb83
commit d959f7defb
2 changed files with 17 additions and 3 deletions
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16
Documentation/filesystems/f2fs.txt
View File

@ -98,10 +98,20 @@ Cleaning Overhead
MOUNT OPTIONS
================================================================================
background_gc_off Turn off cleaning operations, namely garbage collection,
triggered in background when I/O subsystem is idle.
background_gc=%s Turn on/off cleaning operations, namely garbage
collection, triggered in background when I/O subsystem is
idle. If background_gc=on, it will turn on the garbage
collection and if background_gc=off, garbage collection
will be turned off. If background_gc=sync, it will turn
on synchronous garbage collection running in background.
Default value for this option is on. So garbage
collection is on by default.
disable_roll_forward Disable the roll-forward recovery routine
discard Issue discard/TRIM commands when a segment is cleaned.
norecovery Disable the roll-forward recovery routine, mounted read-
only (i.e., -o ro,disable_roll_forward)
discard/nodiscard Enable/disable real-time discard in f2fs, if discard is
enabled, f2fs will issue discard/TRIM commands when a
segment is cleaned.
no_heap Disable heap-style segment allocation which finds free
segments for data from the beginning of main area, while
for node from the end of main area.

4
fs/f2fs/super.c
View File

@ -75,6 +75,7 @@ enum {
Opt_disable_roll_forward,
Opt_norecovery,
Opt_discard,
Opt_nodiscard,
Opt_noheap,
Opt_user_xattr,
Opt_nouser_xattr,
@ -103,6 +104,7 @@ static match_table_t f2fs_tokens = {
{Opt_disable_roll_forward, "disable_roll_forward"},
{Opt_norecovery, "norecovery"},
{Opt_discard, "discard"},
{Opt_nodiscard, "nodiscard"},
{Opt_noheap, "no_heap"},
{Opt_user_xattr, "user_xattr"},
{Opt_nouser_xattr, "nouser_xattr"},
@ -421,6 +423,8 @@ static int parse_options(struct super_block *sb, char *options)
"the device does not support discard");
}
break;
case Opt_nodiscard:
clear_opt(sbi, DISCARD);
case Opt_noheap:
set_opt(sbi, NOHEAP);
break;