Hi Nikolay, Thank you for the patch! Yet something to improve:
[auto build test ERROR on next-20180626] [cannot apply to btrfs/next v4.18-rc2 v4.18-rc1 v4.17 v4.18-rc2] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Nikolay-Borisov/btrfs-Add-graceful-handling-of-V0-extents/20180626-231445 config: i386-randconfig-s1-201825 (attached as .config) compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): fs/btrfs/extent-tree.c: In function 'btrfs_lookup_extent_info': >> fs/btrfs/extent-tree.c:871:4: error: implicit declaration of function >> 'btrfs_print_v0_err' [-Werror=implicit-function-declaration] btrfs_print_v0_err(fs_info); ^~~~~~~~~~~~~~~~~~ fs/btrfs/extent-tree.c: In function 'remove_extent_data_ref': >> fs/btrfs/extent-tree.c:1308:22: error: 'fs_info' undeclared (first use in >> this function) btrfs_print_v0_err(fs_info); ^~~~~~~ fs/btrfs/extent-tree.c:1308:22: note: each undeclared identifier is reported only once for each function it appears in cc1: some warnings being treated as errors -- fs/btrfs/print-tree.c: In function 'print_extent_item': >> fs/btrfs/print-tree.c:56:3: error: implicit declaration of function >> 'btrfs_print_v0_err' [-Werror=implicit-function-declaration] btrfs_print_v0_err(eb->fs_info); ^~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors -- fs/btrfs/relocation.c: In function 'find_inline_backref': >> fs/btrfs/relocation.c:602:3: error: implicit declaration of function >> 'btrfs_print_v0_err' [-Werror=implicit-function-declaration] btrfs_print_v0_err(leaf->fs_info); ^~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/btrfs_print_v0_err +871 fs/btrfs/extent-tree.c 794 795 /* 796 * helper function to lookup reference count and flags of a tree block. 797 * 798 * the head node for delayed ref is used to store the sum of all the 799 * reference count modifications queued up in the rbtree. the head 800 * node may also store the extent flags to set. This way you can check 801 * to see what the reference count and extent flags would be if all of 802 * the delayed refs are not processed. 803 */ 804 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, 805 struct btrfs_fs_info *fs_info, u64 bytenr, 806 u64 offset, int metadata, u64 *refs, u64 *flags) 807 { 808 struct btrfs_delayed_ref_head *head; 809 struct btrfs_delayed_ref_root *delayed_refs; 810 struct btrfs_path *path; 811 struct btrfs_extent_item *ei; 812 struct extent_buffer *leaf; 813 struct btrfs_key key; 814 u32 item_size; 815 u64 num_refs; 816 u64 extent_flags; 817 int ret; 818 819 /* 820 * If we don't have skinny metadata, don't bother doing anything 821 * different 822 */ 823 if (metadata && !btrfs_fs_incompat(fs_info, SKINNY_METADATA)) { 824 offset = fs_info->nodesize; 825 metadata = 0; 826 } 827 828 path = btrfs_alloc_path(); 829 if (!path) 830 return -ENOMEM; 831 832 if (!trans) { 833 path->skip_locking = 1; 834 path->search_commit_root = 1; 835 } 836 837 search_again: 838 key.objectid = bytenr; 839 key.offset = offset; 840 if (metadata) 841 key.type = BTRFS_METADATA_ITEM_KEY; 842 else 843 key.type = BTRFS_EXTENT_ITEM_KEY; 844 845 ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 0); 846 if (ret < 0) 847 goto out_free; 848 849 if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) { 850 if (path->slots[0]) { 851 path->slots[0]--; 852 btrfs_item_key_to_cpu(path->nodes[0], &key, 853 path->slots[0]); 854 if (key.objectid == bytenr && 855 key.type == BTRFS_EXTENT_ITEM_KEY && 856 key.offset == fs_info->nodesize) 857 ret = 0; 858 } 859 } 860 861 if (ret == 0) { 862 leaf = path->nodes[0]; 863 item_size = btrfs_item_size_nr(leaf, path->slots[0]); 864 if (item_size >= sizeof(*ei)) { 865 ei = btrfs_item_ptr(leaf, path->slots[0], 866 struct btrfs_extent_item); 867 num_refs = btrfs_extent_refs(leaf, ei); 868 extent_flags = btrfs_extent_flags(leaf, ei); 869 } else { 870 ret = -EINVAL; > 871 btrfs_print_v0_err(fs_info); 872 if (trans) 873 btrfs_abort_transaction(trans, ret); 874 else 875 btrfs_handle_fs_error(fs_info, ret, NULL); 876 877 goto out_free; 878 } 879 880 BUG_ON(num_refs == 0); 881 } else { 882 num_refs = 0; 883 extent_flags = 0; 884 ret = 0; 885 } 886 887 if (!trans) 888 goto out; 889 890 delayed_refs = &trans->transaction->delayed_refs; 891 spin_lock(&delayed_refs->lock); 892 head = btrfs_find_delayed_ref_head(delayed_refs, bytenr); 893 if (head) { 894 if (!mutex_trylock(&head->mutex)) { 895 refcount_inc(&head->refs); 896 spin_unlock(&delayed_refs->lock); 897 898 btrfs_release_path(path); 899 900 /* 901 * Mutex was contended, block until it's released and try 902 * again 903 */ 904 mutex_lock(&head->mutex); 905 mutex_unlock(&head->mutex); 906 btrfs_put_delayed_ref_head(head); 907 goto search_again; 908 } 909 spin_lock(&head->lock); 910 if (head->extent_op && head->extent_op->update_flags) 911 extent_flags |= head->extent_op->flags_to_set; 912 else 913 BUG_ON(num_refs == 0); 914 915 num_refs += head->ref_mod; 916 spin_unlock(&head->lock); 917 mutex_unlock(&head->mutex); 918 } 919 spin_unlock(&delayed_refs->lock); 920 out: 921 WARN_ON(num_refs == 0); 922 if (refs) 923 *refs = num_refs; 924 if (flags) 925 *flags = extent_flags; 926 out_free: 927 btrfs_free_path(path); 928 return ret; 929 } 930 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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