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-rw-r--r--fs/btrfs/disk-io.c5
-rw-r--r--fs/btrfs/super.c18
-rw-r--r--fs/btrfs/transaction.c45
-rw-r--r--fs/btrfs/transaction.h4
4 files changed, 49 insertions, 23 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 2c18a4eb4d5a..dcaf55695e6f 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1657,9 +1657,10 @@ static int transaction_kthread(void *arg)
spin_unlock(&root->fs_info->trans_lock);
/* If the file system is aborted, this will always fail. */
- trans = btrfs_join_transaction(root);
+ trans = btrfs_attach_transaction(root);
if (IS_ERR(trans)) {
- cannot_commit = true;
+ if (PTR_ERR(trans) != -ENOENT)
+ cannot_commit = true;
goto sleep;
}
if (transid == trans->transid) {
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index fb260bbf59c6..f8b803f30ed8 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -854,10 +854,10 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
btrfs_wait_ordered_extents(root, 0);
- trans = btrfs_join_transaction_freeze(root);
+ trans = btrfs_attach_transaction(root);
if (IS_ERR(trans)) {
- /* Frozen, don't bother */
- if (PTR_ERR(trans) == -EPERM)
+ /* no transaction, don't bother */
+ if (PTR_ERR(trans) == -ENOENT)
return 0;
return PTR_ERR(trans);
}
@@ -1511,7 +1511,17 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
static int btrfs_freeze(struct super_block *sb)
{
- return 0;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_root *root = btrfs_sb(sb)->tree_root;
+
+ trans = btrfs_attach_transaction(root);
+ if (IS_ERR(trans)) {
+ /* no transaction, don't bother */
+ if (PTR_ERR(trans) == -ENOENT)
+ return 0;
+ return PTR_ERR(trans);
+ }
+ return btrfs_commit_transaction(trans, root);
}
static int btrfs_unfreeze(struct super_block *sb)
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index d0a2b7e49381..69139a356f71 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -53,7 +53,7 @@ static noinline void switch_commit_root(struct btrfs_root *root)
/*
* either allocate a new transaction or hop into the existing one
*/
-static noinline int join_transaction(struct btrfs_root *root, int nofail)
+static noinline int join_transaction(struct btrfs_root *root, int type)
{
struct btrfs_transaction *cur_trans;
struct btrfs_fs_info *fs_info = root->fs_info;
@@ -67,7 +67,13 @@ loop:
}
if (fs_info->trans_no_join) {
- if (!nofail) {
+ /*
+ * If we are JOIN_NOLOCK we're already committing a current
+ * transaction, we just need a handle to deal with something
+ * when committing the transaction, such as inode cache and
+ * space cache. It is a special case.
+ */
+ if (type != TRANS_JOIN_NOLOCK) {
spin_unlock(&fs_info->trans_lock);
return -EBUSY;
}
@@ -87,6 +93,13 @@ loop:
}
spin_unlock(&fs_info->trans_lock);
+ /*
+ * If we are ATTACH, we just want to catch the current transaction,
+ * and commit it. If there is no transaction, just return ENOENT.
+ */
+ if (type == TRANS_ATTACH)
+ return -ENOENT;
+
cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, GFP_NOFS);
if (!cur_trans)
return -ENOMEM;
@@ -340,27 +353,28 @@ again:
* because we're already holding a ref. We need this because we could
* have raced in and did an fsync() on a file which can kick a commit
* and then we deadlock with somebody doing a freeze.
+ *
+ * If we are ATTACH, it means we just want to catch the current
+ * transaction and commit it, so we needn't do sb_start_intwrite().
*/
- if (type != TRANS_JOIN_NOLOCK &&
- !__sb_start_write(root->fs_info->sb, SB_FREEZE_FS, false)) {
- if (type == TRANS_JOIN_FREEZE) {
- kmem_cache_free(btrfs_trans_handle_cachep, h);
- return ERR_PTR(-EPERM);
- }
+ if (type < TRANS_JOIN_NOLOCK)
sb_start_intwrite(root->fs_info->sb);
- }
if (may_wait_transaction(root, type))
wait_current_trans(root);
do {
- ret = join_transaction(root, type == TRANS_JOIN_NOLOCK);
+ ret = join_transaction(root, type);
if (ret == -EBUSY)
wait_current_trans(root);
} while (ret == -EBUSY);
if (ret < 0) {
- sb_end_intwrite(root->fs_info->sb);
+ /* We must get the transaction if we are JOIN_NOLOCK. */
+ BUG_ON(type == TRANS_JOIN_NOLOCK);
+
+ if (type < TRANS_JOIN_NOLOCK)
+ sb_end_intwrite(root->fs_info->sb);
kmem_cache_free(btrfs_trans_handle_cachep, h);
return ERR_PTR(ret);
}
@@ -432,9 +446,9 @@ struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root
return start_transaction(root, 0, TRANS_USERSPACE, 0);
}
-struct btrfs_trans_handle *btrfs_join_transaction_freeze(struct btrfs_root *root)
+struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root)
{
- return start_transaction(root, 0, TRANS_JOIN_FREEZE, 0);
+ return start_transaction(root, 0, TRANS_ATTACH, 0);
}
/* wait for a transaction commit to be fully complete */
@@ -605,7 +619,7 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
}
}
- if (lock)
+ if (trans->type < TRANS_JOIN_NOLOCK)
sb_end_intwrite(root->fs_info->sb);
WARN_ON(cur_trans != info->running_transaction);
@@ -1678,7 +1692,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
put_transaction(cur_trans);
put_transaction(cur_trans);
- sb_end_intwrite(root->fs_info->sb);
+ if (trans->type < TRANS_JOIN_NOLOCK)
+ sb_end_intwrite(root->fs_info->sb);
trace_btrfs_transaction_commit(root);
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 0630bd19396a..80961947a6b2 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -52,7 +52,7 @@ enum btrfs_trans_type {
TRANS_JOIN,
TRANS_USERSPACE,
TRANS_JOIN_NOLOCK,
- TRANS_JOIN_FREEZE,
+ TRANS_ATTACH,
};
struct btrfs_trans_handle {
@@ -109,7 +109,7 @@ struct btrfs_trans_handle *btrfs_start_transaction_noflush(
struct btrfs_root *root, int num_items);
struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
-struct btrfs_trans_handle *btrfs_join_transaction_freeze(struct btrfs_root *root);
+struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-03 10:55:53 +0000