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f2fs: add nobarrier mount option

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This patch adds a mount option, nobarrier, in f2fs.
The assumption in here is that file system keeps the IO ordering, but
doesn't care about cache flushes inside the storages.

Reviewed-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
This commit is contained in:
Jaegeuk Kim 2014-07-23 09:57:31 -07:00
commit 0f7b2abd18
5 changed files with 20 additions and 1 deletions
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5
fs/f2fs/data.c
View file

@ -139,7 +139,10 @@ void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
/* change META to META_FLUSH in the checkpoint procedure */
if (type >= META_FLUSH) {
io->fio.type = META_FLUSH;
io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO;
if (test_opt(sbi, NOBARRIER))
io->fio.rw = WRITE_FLUSH | REQ_META | REQ_PRIO;
else
io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO;
}
__submit_merged_bio(io);
up_write(&io->io_rwsem);

1
fs/f2fs/f2fs.h
View file

@ -41,6 +41,7 @@
#define F2FS_MOUNT_INLINE_XATTR 0x00000080
#define F2FS_MOUNT_INLINE_DATA 0x00000100
#define F2FS_MOUNT_FLUSH_MERGE 0x00000200
#define F2FS_MOUNT_NOBARRIER 0x00000400
#define clear_opt(sbi, option) (sbi->mount_opt.opt &= ~F2FS_MOUNT_##option)
#define set_opt(sbi, option) (sbi->mount_opt.opt |= F2FS_MOUNT_##option)

3
fs/f2fs/segment.c
View file

@ -239,6 +239,9 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi)
struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
struct flush_cmd cmd;
if (test_opt(sbi, NOBARRIER))
return 0;
if (!test_opt(sbi, FLUSH_MERGE))
return blkdev_issue_flush(sbi->sb->s_bdev, GFP_KERNEL, NULL);

7
fs/f2fs/super.c
View file

@ -52,6 +52,7 @@ enum {
Opt_inline_xattr,
Opt_inline_data,
Opt_flush_merge,
Opt_nobarrier,
Opt_err,
};
@ -69,6 +70,7 @@ static match_table_t f2fs_tokens = {
{Opt_inline_xattr, "inline_xattr"},
{Opt_inline_data, "inline_data"},
{Opt_flush_merge, "flush_merge"},
{Opt_nobarrier, "nobarrier"},
{Opt_err, NULL},
};
@ -339,6 +341,9 @@ static int parse_options(struct super_block *sb, char *options)
case Opt_flush_merge:
set_opt(sbi, FLUSH_MERGE);
break;
case Opt_nobarrier:
set_opt(sbi, NOBARRIER);
break;
default:
f2fs_msg(sb, KERN_ERR,
"Unrecognized mount option \"%s\" or missing value",
@ -544,6 +549,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
seq_puts(seq, ",inline_data");
if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
seq_puts(seq, ",flush_merge");
if (test_opt(sbi, NOBARRIER))
seq_puts(seq, ",nobarrier");
seq_printf(seq, ",active_logs=%u", sbi->active_logs);
return 0;