From: Josef Bacik <josef@toxicpanda.com>
Date: Tue, 21 Jul 2020 10:22:12 -0400
Subject: btrfs: change nr to u64 in btrfs_start_delalloc_roots
Git-commit: b49121393f583635b78abae4037fa1e772b2a042
Patch-mainline: v5.10-rc1
References: bsc#1135481

We have btrfs_wait_ordered_roots() which takes a u64 for nr, but
btrfs_start_delalloc_roots() that takes an int for nr, which makes using
them in conjunction, especially for something like (u64)-1, annoying and
inconsistent.  Fix btrfs_start_delalloc_roots() to take a u64 for nr and
adjust start_delalloc_inodes() and it's callers appropriately.

This means we've adjusted start_delalloc_inodes() to take a pointer of
nr since we want to preserve the ability for start-delalloc_inodes() to
return an error, so simply make it do the nr adjusting as necessary.

Part of adjusting the callers to this means changing
btrfs_writeback_inodes_sb_nr() to take a u64 for items.  This may be
confusing because it seems unrelated, but the caller of
btrfs_writeback_inodes_sb_nr() already passes in a u64, it's just the
function variable that needs to be changed.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Tested-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Acked-by: Nikolay Borisov <nborisov@suse.com>
---
 fs/btrfs/ctree.h       |  2 +-
 fs/btrfs/dev-replace.c |  2 +-
 fs/btrfs/inode.c       | 26 ++++++++++----------------
 fs/btrfs/ioctl.c       |  2 +-
 fs/btrfs/space-info.c  |  2 +-
 5 files changed, 14 insertions(+), 20 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 9a72896bed2e..e2ec4f067857 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2956,7 +2956,7 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
 			       u32 min_type);
 
 int btrfs_start_delalloc_snapshot(struct btrfs_root *root);
-int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr);
+int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, u64 nr);
 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
 			      unsigned int extra_bits,
 			      struct extent_state **cached_state);
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index e4a1c6afe35d..61d800a149b0 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -661,7 +661,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
 	 * flush all outstanding I/O and inode extent mappings before the
 	 * copy operation is declared as being finished
 	 */
-	ret = btrfs_start_delalloc_roots(fs_info, -1);
+	ret = btrfs_start_delalloc_roots(fs_info, U64_MAX);
 	if (ret) {
 		mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
 		return ret;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index df08ace5d914..48b8b5f09f47 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -9387,7 +9387,7 @@ static struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode
  * some fairly slow code that needs optimization. This walks the list
  * of all the inodes with pending delalloc and forces them to disk.
  */
-static int start_delalloc_inodes(struct btrfs_root *root, int nr, bool snapshot)
+static int start_delalloc_inodes(struct btrfs_root *root, u64 *nr, bool snapshot)
 {
 	struct btrfs_inode *binode;
 	struct inode *inode;
@@ -9427,9 +9427,11 @@ static int start_delalloc_inodes(struct btrfs_root *root, int nr, bool snapshot)
 		list_add_tail(&work->list, &works);
 		btrfs_queue_work(root->fs_info->flush_workers,
 				 &work->work);
-		ret++;
-		if (nr != -1 && ret >= nr)
-			goto out;
+		if (*nr != U64_MAX) {
+			(*nr)--;
+			if (*nr == 0)
+				goto out;
+		}
 		cond_resched();
 		spin_lock(&root->delalloc_lock);
 	}
@@ -9454,18 +9456,15 @@ static int start_delalloc_inodes(struct btrfs_root *root, int nr, bool snapshot)
 int btrfs_start_delalloc_snapshot(struct btrfs_root *root)
 {
 	struct btrfs_fs_info *fs_info = root->fs_info;
-	int ret;
+	u64 nr = U64_MAX;
 
 	if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
 		return -EROFS;
 
-	ret = start_delalloc_inodes(root, -1, true);
-	if (ret > 0)
-		ret = 0;
-	return ret;
+	return start_delalloc_inodes(root, &nr, true);
 }
 
-int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr)
+int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, u64 nr)
 {
 	struct btrfs_root *root;
 	struct list_head splice;
@@ -9488,15 +9487,10 @@ int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr)
 			       &fs_info->delalloc_roots);
 		spin_unlock(&fs_info->delalloc_root_lock);
 
-		ret = start_delalloc_inodes(root, nr, false);
+		ret = start_delalloc_inodes(root, &nr, false);
 		btrfs_put_root(root);
 		if (ret < 0)
 			goto out;
-
-		if (nr != -1) {
-			nr -= ret;
-			WARN_ON(nr < 0);
-		}
 		spin_lock(&fs_info->delalloc_root_lock);
 	}
 	spin_unlock(&fs_info->delalloc_root_lock);
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 2d9109d9e98f..a5355a16eabb 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4897,7 +4897,7 @@ long btrfs_ioctl(struct file *file, unsigned int
 	case BTRFS_IOC_SYNC: {
 		int ret;
 
-		ret = btrfs_start_delalloc_roots(fs_info, -1);
+		ret = btrfs_start_delalloc_roots(fs_info, U64_MAX);
 		if (ret)
 			return ret;
 		ret = btrfs_sync_fs(inode->i_sb, 1);
diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
index 475968ccbd1d..266ff14e4c8c 100644
--- a/fs/btrfs/space-info.c
+++ b/fs/btrfs/space-info.c
@@ -477,7 +477,7 @@ void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
 }
 
 static void btrfs_writeback_inodes_sb_nr(struct btrfs_fs_info *fs_info,
-					 unsigned long nr_pages, int nr_items)
+					 unsigned long nr_pages, u64 nr_items)
 {
 	struct super_block *sb = fs_info->sb;