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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 MOUNT OPTIONS
================================================================================ ================================================================================
background_gc_off Turn off cleaning operations, namely garbage collection, background_gc=%s Turn on/off cleaning operations, namely garbage
triggered in background when I/O subsystem is idle. 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 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 no_heap Disable heap-style segment allocation which finds free
segments for data from the beginning of main area, while segments for data from the beginning of main area, while
for node from the end of main area. 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_disable_roll_forward,
Opt_norecovery, Opt_norecovery,
Opt_discard, Opt_discard,
Opt_nodiscard,
Opt_noheap, Opt_noheap,
Opt_user_xattr, Opt_user_xattr,
Opt_nouser_xattr, Opt_nouser_xattr,
@ -103,6 +104,7 @@ static match_table_t f2fs_tokens = {
{Opt_disable_roll_forward, "disable_roll_forward"}, {Opt_disable_roll_forward, "disable_roll_forward"},
{Opt_norecovery, "norecovery"}, {Opt_norecovery, "norecovery"},
{Opt_discard, "discard"}, {Opt_discard, "discard"},
{Opt_nodiscard, "nodiscard"},
{Opt_noheap, "no_heap"}, {Opt_noheap, "no_heap"},
{Opt_user_xattr, "user_xattr"}, {Opt_user_xattr, "user_xattr"},
{Opt_nouser_xattr, "nouser_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"); "the device does not support discard");
} }
break; break;
case Opt_nodiscard:
clear_opt(sbi, DISCARD);
case Opt_noheap: case Opt_noheap:
set_opt(sbi, NOHEAP); set_opt(sbi, NOHEAP);
break; break;