Hi Chris-
Here's a simpler version of the patch that drops the unrelated sync_fs
stuff.
thanks-
sage
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
the committed state a fully consistent view of the file system from the
application's perspective (i.e., it includes all completed file system
operations). This was previously the behavior only when a snapshot is
created.
This is used by Ceph to ensure that completed writes make it to the
platter along with the metadata operations they are bound to (by
BTRFS_IOC_TRANS_{START,END}).
Signed-off-by: Sage Weil <sage@xxxxxxxxxxxx>
---
fs/btrfs/ctree.h | 1 +
fs/btrfs/super.c | 10 +++++++---
fs/btrfs/transaction.c | 5 ++++-
3 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 471fa67..019e7a7 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -951,6 +951,7 @@ struct btrfs_root {
#define BTRFS_MOUNT_DEGRADED (1 << 4)
#define BTRFS_MOUNT_COMPRESS (1 << 5)
#define BTRFS_MOUNT_NOTREELOG (1 << 6)
+#define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
#define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
#define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index d8c664c..2b33a6a 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -67,7 +67,7 @@ enum {
Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow,
Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier,
Opt_ssd, Opt_thread_pool, Opt_noacl, Opt_compress, Opt_notreelog,
- Opt_err,
+ Opt_flushoncommit, Opt_err,
};
static match_table_t tokens = {
@@ -85,6 +85,7 @@ static match_table_t tokens = {
{Opt_ssd, "ssd"},
{Opt_noacl, "noacl"},
{Opt_notreelog, "notreelog"},
+ {Opt_flushoncommit, "flushoncommit"},
{Opt_err, NULL},
};
@@ -228,6 +229,10 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
printk(KERN_INFO "btrfs: disabling tree log\n");
btrfs_set_opt(info->mount_opt, NOTREELOG);
break;
+ case Opt_flushoncommit:
+ printk(KERN_INFO "btrfs: turning on flush-on-commit\n");
+ btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT);
+ break;
default:
break;
}
@@ -369,9 +374,8 @@ fail_close:
int btrfs_sync_fs(struct super_block *sb, int wait)
{
struct btrfs_trans_handle *trans;
- struct btrfs_root *root;
+ struct btrfs_root *root = btrfs_sb(sb);
int ret;
- root = btrfs_sb(sb);
if (sb->s_flags & MS_RDONLY)
return 0;
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 919172d..b8822d5 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -892,6 +892,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
struct extent_io_tree *pinned_copy;
DEFINE_WAIT(wait);
int ret;
+ int ordered = btrfs_test_opt(root, FLUSHONCOMMIT);
INIT_LIST_HEAD(&dirty_fs_roots);
mutex_lock(&root->fs_info->trans_mutex);
@@ -952,7 +953,9 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
mutex_unlock(&root->fs_info->trans_mutex);
- if (snap_pending) {
+ if (ordered || snap_pending) {
+ if (ordered)
+ btrfs_start_delalloc_inodes(root);
ret = btrfs_wait_ordered_extents(root, 1);
BUG_ON(ret);
}
--
1.5.6.5
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