btrfs: check for relocation inodes on zoned btrfs in should_nocow

commit 2adada886b26e998b5a624e72f0834ebfdc54cc7 upstream

Prepare for allowing preallocation for relocation inodes.

Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 85663bccde8a8cbbdac15d805f6125ba6eb4cdfa..61b4651f008d4e04014bd90be01724b57dea4258 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1945,7 +1945,15 @@ int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page
        const bool zoned = btrfs_is_zoned(inode->root->fs_info);
 
        if (should_nocow(inode, start, end)) {
-               ASSERT(!zoned);
+               /*
+                * Normally on a zoned device we're only doing COW writes, but
+                * in case of relocation on a zoned filesystem we have taken
+                * precaution, that we're only writing sequentially. It's safe
+                * to use run_delalloc_nocow() here, like for  regular
+                * preallocated inodes.
+                */
+               ASSERT(!zoned ||
+                      (zoned && btrfs_is_data_reloc_root(inode->root)));
                ret = run_delalloc_nocow(inode, locked_page, start, end,
                                         page_started, nr_written);
        } else if (!inode_can_compress(inode) ||