From: Qu Wenruo Date: Tue, 25 Jun 2024 04:10:49 +0000 (+0930) Subject: btrfs: fix the ram_bytes assignment for truncated ordered extents X-Git-Tag: v6.11-rc1~157^2~13 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=896c8b92dda6ca20c6a591db996039aa8931478b;p=thirdparty%2Fkernel%2Flinux.git btrfs: fix the ram_bytes assignment for truncated ordered extents [HICCUP] After adding extra checks on btrfs_file_extent_item::ram_bytes to tree-checker, running fsstress leads to tree-checker warning at write time, as we created file extent items with an invalid ram_bytes. All those offending file extents have offset 0, and ram_bytes matching num_bytes, and smaller than disk_num_bytes. This would also trigger the recently enhanced btrfs-check, which catches such mismatches and report them as minor errors. [CAUSE] When a folio/page is invalidated and it is part of a submitted OE, we mark the OE truncated just to the beginning of the folio/page. And for truncated OE, we insert the file extent item with incorrect value for ram_bytes (using num_bytes instead of the usual value). This is not a big deal for end users, as we do not utilize the ram_bytes field for regular non-compressed extents. This mismatch is just a small violation against on-disk format. [FIX] Fix it by removing the override on btrfs_file_extent_item::ram_bytes. Reviewed-by: Filipe Manana Signed-off-by: Qu Wenruo Signed-off-by: David Sterba --- diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 90f26b0464b88..a208ec47b6bde 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2960,10 +2960,8 @@ static int insert_ordered_extent_file_extent(struct btrfs_trans_handle *trans, btrfs_set_stack_file_extent_disk_num_bytes(&stack_fi, oe->disk_num_bytes); btrfs_set_stack_file_extent_offset(&stack_fi, oe->offset); - if (test_bit(BTRFS_ORDERED_TRUNCATED, &oe->flags)) { + if (test_bit(BTRFS_ORDERED_TRUNCATED, &oe->flags)) num_bytes = oe->truncated_len; - ram_bytes = num_bytes; - } btrfs_set_stack_file_extent_num_bytes(&stack_fi, num_bytes); btrfs_set_stack_file_extent_ram_bytes(&stack_fi, ram_bytes); btrfs_set_stack_file_extent_compression(&stack_fi, oe->compress_type);