From d7fe99de12daf964a7422c98fda30cb5cc57cbdf Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 6 Oct 2025 10:36:11 +0200 Subject: [PATCH] btrfs: push struct writeback_control into start_delalloc_inodes In preparation for changing the filemap_fdatawrite_wbc API to not expose the writeback_control to the callers, push the wbc declaration next to the filemap_fdatawrite_wbc call and just pass the nr_to_write value to start_delalloc_inodes. Signed-off-by: Christoph Hellwig Reviewed-by: Damien Le Moal Reviewed-by: Johannes Thumshirn --- fs/btrfs/inode.c | 51 ++++++++++++++++++++---------------------------- 1 file changed, 21 insertions(+), 30 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 9edb78fc57fc..b97d6c1f7772 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -8709,15 +8709,13 @@ 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, - struct writeback_control *wbc, bool snapshot, - bool in_reclaim_context) +static int start_delalloc_inodes(struct btrfs_root *root, long *nr_to_write, + bool snapshot, bool in_reclaim_context) { struct btrfs_delalloc_work *work, *next; LIST_HEAD(works); LIST_HEAD(splice); int ret = 0; - bool full_flush = wbc->nr_to_write == LONG_MAX; mutex_lock(&root->delalloc_mutex); spin_lock(&root->delalloc_lock); @@ -8743,7 +8741,7 @@ static int start_delalloc_inodes(struct btrfs_root *root, if (snapshot) set_bit(BTRFS_INODE_SNAPSHOT_FLUSH, &inode->runtime_flags); - if (full_flush) { + if (nr_to_write == NULL) { work = btrfs_alloc_delalloc_work(tmp_inode); if (!work) { iput(tmp_inode); @@ -8754,9 +8752,20 @@ static int start_delalloc_inodes(struct btrfs_root *root, btrfs_queue_work(root->fs_info->flush_workers, &work->work); } else { - ret = filemap_fdatawrite_wbc(tmp_inode->i_mapping, wbc); + struct writeback_control wbc = { + .nr_to_write = *nr_to_write, + .sync_mode = WB_SYNC_NONE, + .range_start = 0, + .range_end = LLONG_MAX, + }; + + ret = filemap_fdatawrite_wbc(tmp_inode->i_mapping, + &wbc); btrfs_add_delayed_iput(inode); - if (ret || wbc->nr_to_write <= 0) + + if (*nr_to_write != LONG_MAX) + *nr_to_write = wbc.nr_to_write; + if (ret || *nr_to_write <= 0) goto out; } cond_resched(); @@ -8782,29 +8791,17 @@ out: int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context) { - struct writeback_control wbc = { - .nr_to_write = LONG_MAX, - .sync_mode = WB_SYNC_NONE, - .range_start = 0, - .range_end = LLONG_MAX, - }; struct btrfs_fs_info *fs_info = root->fs_info; if (BTRFS_FS_ERROR(fs_info)) return -EROFS; - - return start_delalloc_inodes(root, &wbc, true, in_reclaim_context); + return start_delalloc_inodes(root, NULL, true, in_reclaim_context); } int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr, bool in_reclaim_context) { - struct writeback_control wbc = { - .nr_to_write = nr, - .sync_mode = WB_SYNC_NONE, - .range_start = 0, - .range_end = LLONG_MAX, - }; + long *nr_to_write = nr == LONG_MAX ? NULL : &nr; struct btrfs_root *root; LIST_HEAD(splice); int ret; @@ -8816,13 +8813,6 @@ int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr, spin_lock(&fs_info->delalloc_root_lock); list_splice_init(&fs_info->delalloc_roots, &splice); while (!list_empty(&splice)) { - /* - * Reset nr_to_write here so we know that we're doing a full - * flush. - */ - if (nr == LONG_MAX) - wbc.nr_to_write = LONG_MAX; - root = list_first_entry(&splice, struct btrfs_root, delalloc_root); root = btrfs_grab_root(root); @@ -8831,9 +8821,10 @@ int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr, &fs_info->delalloc_roots); spin_unlock(&fs_info->delalloc_root_lock); - ret = start_delalloc_inodes(root, &wbc, false, in_reclaim_context); + ret = start_delalloc_inodes(root, nr_to_write, false, + in_reclaim_context); btrfs_put_root(root); - if (ret < 0 || wbc.nr_to_write <= 0) + if (ret < 0 || nr <= 0) goto out; spin_lock(&fs_info->delalloc_root_lock); } -- 2.51.0