Add noflushoncommit mount option to disable flush on commit with
remount option.
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
changelog:
v2: Add noflushoncommit mount option.
---
Documentation/filesystems/btrfs.txt | 1 +
fs/btrfs/super.c | 8 +++++++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/Documentation/filesystems/btrfs.txt b/Documentation/filesystems/btrfs.txt
index 14765e6..516ed65 100644
--- a/Documentation/filesystems/btrfs.txt
+++ b/Documentation/filesystems/btrfs.txt
@@ -120,6 +120,7 @@ Options with (*) are default options and will not show in the mount options.
"bug" - BUG() on a fatal error. This is the default.
"panic" - panic() on a fatal error.
+ noflushoncommit(*)
flushoncommit
The 'flushoncommit' mount option forces any data dirtied by a write in a
prior transaction to commit as part of the current commit. This makes
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index fa9c698..c511239 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -324,7 +324,7 @@ enum {
Opt_check_integrity, Opt_check_integrity_including_extent_data,
Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree,
Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nocheck_integrity,
- Opt_nodiscard, Opt_noenospc_debug,
+ Opt_nodiscard, Opt_noenospc_debug, Opt_noflushoncommit,
Opt_err,
};
@@ -350,6 +350,7 @@ static match_table_t tokens = {
{Opt_noacl, "noacl"},
{Opt_notreelog, "notreelog"},
{Opt_flushoncommit, "flushoncommit"},
+ {Opt_noflushoncommit, "noflushoncommit"},
{Opt_ratio, "metadata_ratio=%d"},
{Opt_discard, "discard"},
{Opt_nodiscard, "nodiscard"},
@@ -563,6 +564,11 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
btrfs_info(root->fs_info, "turning on flush-on-commit");
btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT);
break;
+ case Opt_noflushoncommit:
+ if (btrfs_test_opt(root, FLUSHONCOMMIT))
+ btrfs_info(root->fs_info, "turning off flush-on-commit");
+ btrfs_clear_opt(info->mount_opt, FLUSHONCOMMIT);
+ break;
case Opt_ratio:
ret = match_int(&args[0], &intarg);
if (ret) {
--
1.8.5.2
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