Btrfs: Introduce global metadata reservation
Reserve metadata space for extent tree, checksum tree and root tree
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 054b447..309d8c0 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1463,10 +1463,6 @@
struct btrfs_root *root = arg;
do {
- smp_mb();
- if (root->fs_info->closing)
- break;
-
vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
if (!(root->fs_info->sb->s_flags & MS_RDONLY) &&
@@ -1479,11 +1475,9 @@
if (freezing(current)) {
refrigerator();
} else {
- smp_mb();
- if (root->fs_info->closing)
- break;
set_current_state(TASK_INTERRUPTIBLE);
- schedule();
+ if (!kthread_should_stop())
+ schedule();
__set_current_state(TASK_RUNNING);
}
} while (!kthread_should_stop());
@@ -1495,36 +1489,40 @@
struct btrfs_root *root = arg;
struct btrfs_trans_handle *trans;
struct btrfs_transaction *cur;
+ u64 transid;
unsigned long now;
unsigned long delay;
int ret;
do {
- smp_mb();
- if (root->fs_info->closing)
- break;
-
delay = HZ * 30;
vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
mutex_lock(&root->fs_info->transaction_kthread_mutex);
- mutex_lock(&root->fs_info->trans_mutex);
+ spin_lock(&root->fs_info->new_trans_lock);
cur = root->fs_info->running_transaction;
if (!cur) {
- mutex_unlock(&root->fs_info->trans_mutex);
+ spin_unlock(&root->fs_info->new_trans_lock);
goto sleep;
}
now = get_seconds();
- if (now < cur->start_time || now - cur->start_time < 30) {
- mutex_unlock(&root->fs_info->trans_mutex);
+ if (!cur->blocked &&
+ (now < cur->start_time || now - cur->start_time < 30)) {
+ spin_unlock(&root->fs_info->new_trans_lock);
delay = HZ * 5;
goto sleep;
}
- mutex_unlock(&root->fs_info->trans_mutex);
- trans = btrfs_join_transaction(root, 1);
- ret = btrfs_commit_transaction(trans, root);
+ transid = cur->transid;
+ spin_unlock(&root->fs_info->new_trans_lock);
+ trans = btrfs_join_transaction(root, 1);
+ if (transid == trans->transid) {
+ ret = btrfs_commit_transaction(trans, root);
+ BUG_ON(ret);
+ } else {
+ btrfs_end_transaction(trans, root);
+ }
sleep:
wake_up_process(root->fs_info->cleaner_kthread);
mutex_unlock(&root->fs_info->transaction_kthread_mutex);
@@ -1532,10 +1530,10 @@
if (freezing(current)) {
refrigerator();
} else {
- if (root->fs_info->closing)
- break;
set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(delay);
+ if (!kthread_should_stop() &&
+ !btrfs_transaction_blocked(root->fs_info))
+ schedule_timeout(delay);
__set_current_state(TASK_RUNNING);
}
} while (!kthread_should_stop());
@@ -1917,17 +1915,18 @@
csum_root->track_dirty = 1;
+ fs_info->generation = generation;
+ fs_info->last_trans_committed = generation;
+ fs_info->data_alloc_profile = (u64)-1;
+ fs_info->metadata_alloc_profile = (u64)-1;
+ fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
+
ret = btrfs_read_block_groups(extent_root);
if (ret) {
printk(KERN_ERR "Failed to read block groups: %d\n", ret);
goto fail_block_groups;
}
- fs_info->generation = generation;
- fs_info->last_trans_committed = generation;
- fs_info->data_alloc_profile = (u64)-1;
- fs_info->metadata_alloc_profile = (u64)-1;
- fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
"btrfs-cleaner");
if (IS_ERR(fs_info->cleaner_kthread))
@@ -2430,15 +2429,15 @@
fs_info->closing = 1;
smp_mb();
- kthread_stop(root->fs_info->transaction_kthread);
- kthread_stop(root->fs_info->cleaner_kthread);
-
if (!(fs_info->sb->s_flags & MS_RDONLY)) {
ret = btrfs_commit_super(root);
if (ret)
printk(KERN_ERR "btrfs: commit super ret %d\n", ret);
}
+ kthread_stop(root->fs_info->transaction_kthread);
+ kthread_stop(root->fs_info->cleaner_kthread);
+
fs_info->closing = 2;
smp_mb();