From 3499dcb6c507d378b1b75ff40d602da6e1991b8d Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Wed, 7 May 2025 13:05:36 +0100 Subject: [PATCH] btrfs: fix qgroup reservation leak on failure to allocate ordered extent [ Upstream commit 1f2889f5594a2bc4c6a52634c4a51b93e785def5 ] If we fail to allocate an ordered extent for a COW write we end up leaking a qgroup data reservation since we called btrfs_qgroup_release_data() but we didn't call btrfs_qgroup_free_refroot() (which would happen when running the respective data delayed ref created by ordered extent completion or when finishing the ordered extent in case an error happened). So make sure we call btrfs_qgroup_free_refroot() if we fail to allocate an ordered extent for a COW write. Fixes: 7dbeaad0af7d ("btrfs: change timing for qgroup reserved space for ordered extents to fix reserved space leak") CC: stable@vger.kernel.org # 6.1+ Reviewed-by: Boris Burkov Reviewed-by: Qu Wenruo Signed-off-by: Filipe Manana Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/ordered-data.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c index 86d846eb5ed4..c68e9ecbc438 100644 --- a/fs/btrfs/ordered-data.c +++ b/fs/btrfs/ordered-data.c @@ -154,9 +154,10 @@ static struct btrfs_ordered_extent *alloc_ordered_extent( struct btrfs_ordered_extent *entry; int ret; u64 qgroup_rsv = 0; + const bool is_nocow = (flags & + ((1U << BTRFS_ORDERED_NOCOW) | (1U << BTRFS_ORDERED_PREALLOC))); - if (flags & - ((1 << BTRFS_ORDERED_NOCOW) | (1 << BTRFS_ORDERED_PREALLOC))) { + if (is_nocow) { /* For nocow write, we can release the qgroup rsv right now */ ret = btrfs_qgroup_free_data(inode, NULL, file_offset, num_bytes, &qgroup_rsv); if (ret < 0) @@ -171,8 +172,13 @@ static struct btrfs_ordered_extent *alloc_ordered_extent( return ERR_PTR(ret); } entry = kmem_cache_zalloc(btrfs_ordered_extent_cache, GFP_NOFS); - if (!entry) + if (!entry) { + if (!is_nocow) + btrfs_qgroup_free_refroot(inode->root->fs_info, + btrfs_root_id(inode->root), + qgroup_rsv, BTRFS_QGROUP_RSV_DATA); return ERR_PTR(-ENOMEM); + } entry->file_offset = file_offset; entry->num_bytes = num_bytes;