Merge tag 'for-4.19-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[muen/linux.git] / fs / btrfs / inode.c
index 9357a19d2bff2c76de1b29d2e221333b6f76da7e..3ea5339603cff14f8dc103f6561091e83dc0b81a 100644 (file)
@@ -1271,7 +1271,7 @@ static noinline int run_delalloc_nocow(struct inode *inode,
        u64 disk_num_bytes;
        u64 ram_bytes;
        int extent_type;
-       int ret, err;
+       int ret;
        int type;
        int nocow;
        int check_prev = 1;
@@ -1403,11 +1403,8 @@ next_slot:
                         * if there are pending snapshots for this root,
                         * we fall into common COW way.
                         */
-                       if (!nolock) {
-                               err = btrfs_start_write_no_snapshotting(root);
-                               if (!err)
-                                       goto out_check;
-                       }
+                       if (!nolock && atomic_read(&root->snapshot_force_cow))
+                               goto out_check;
                        /*
                         * force cow if csum exists in the range.
                         * this ensure that csum for a given extent are
@@ -1416,9 +1413,6 @@ next_slot:
                        ret = csum_exist_in_range(fs_info, disk_bytenr,
                                                  num_bytes);
                        if (ret) {
-                               if (!nolock)
-                                       btrfs_end_write_no_snapshotting(root);
-
                                /*
                                 * ret could be -EIO if the above fails to read
                                 * metadata.
@@ -1431,11 +1425,8 @@ next_slot:
                                WARN_ON_ONCE(nolock);
                                goto out_check;
                        }
-                       if (!btrfs_inc_nocow_writers(fs_info, disk_bytenr)) {
-                               if (!nolock)
-                                       btrfs_end_write_no_snapshotting(root);
+                       if (!btrfs_inc_nocow_writers(fs_info, disk_bytenr))
                                goto out_check;
-                       }
                        nocow = 1;
                } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
                        extent_end = found_key.offset +
@@ -1448,8 +1439,6 @@ next_slot:
 out_check:
                if (extent_end <= start) {
                        path->slots[0]++;
-                       if (!nolock && nocow)
-                               btrfs_end_write_no_snapshotting(root);
                        if (nocow)
                                btrfs_dec_nocow_writers(fs_info, disk_bytenr);
                        goto next_slot;
@@ -1471,8 +1460,6 @@ out_check:
                                             end, page_started, nr_written, 1,
                                             NULL);
                        if (ret) {
-                               if (!nolock && nocow)
-                                       btrfs_end_write_no_snapshotting(root);
                                if (nocow)
                                        btrfs_dec_nocow_writers(fs_info,
                                                                disk_bytenr);
@@ -1492,8 +1479,6 @@ out_check:
                                          ram_bytes, BTRFS_COMPRESS_NONE,
                                          BTRFS_ORDERED_PREALLOC);
                        if (IS_ERR(em)) {
-                               if (!nolock && nocow)
-                                       btrfs_end_write_no_snapshotting(root);
                                if (nocow)
                                        btrfs_dec_nocow_writers(fs_info,
                                                                disk_bytenr);
@@ -1532,8 +1517,6 @@ out_check:
                                             EXTENT_CLEAR_DATA_RESV,
                                             PAGE_UNLOCK | PAGE_SET_PRIVATE2);
 
-               if (!nolock && nocow)
-                       btrfs_end_write_no_snapshotting(root);
                cur_offset = extent_end;
 
                /*
@@ -6639,6 +6622,8 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
                drop_inode = 1;
        } else {
                struct dentry *parent = dentry->d_parent;
+               int ret;
+
                err = btrfs_update_inode(trans, root, inode);
                if (err)
                        goto fail;
@@ -6652,7 +6637,12 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
                                goto fail;
                }
                d_instantiate(dentry, inode);
-               btrfs_log_new_name(trans, BTRFS_I(inode), NULL, parent);
+               ret = btrfs_log_new_name(trans, BTRFS_I(inode), NULL, parent,
+                                        true, NULL);
+               if (ret == BTRFS_NEED_TRANS_COMMIT) {
+                       err = btrfs_commit_transaction(trans);
+                       trans = NULL;
+               }
        }
 
 fail:
@@ -9388,14 +9378,21 @@ static int btrfs_rename_exchange(struct inode *old_dir,
        u64 new_idx = 0;
        u64 root_objectid;
        int ret;
-       int ret2;
        bool root_log_pinned = false;
        bool dest_log_pinned = false;
+       struct btrfs_log_ctx ctx_root;
+       struct btrfs_log_ctx ctx_dest;
+       bool sync_log_root = false;
+       bool sync_log_dest = false;
+       bool commit_transaction = false;
 
        /* we only allow rename subvolume link between subvolumes */
        if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest)
                return -EXDEV;
 
+       btrfs_init_log_ctx(&ctx_root, old_inode);
+       btrfs_init_log_ctx(&ctx_dest, new_inode);
+
        /* close the race window with snapshot create/destroy ioctl */
        if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
                down_read(&fs_info->subvol_sem);
@@ -9542,15 +9539,29 @@ static int btrfs_rename_exchange(struct inode *old_dir,
 
        if (root_log_pinned) {
                parent = new_dentry->d_parent;
-               btrfs_log_new_name(trans, BTRFS_I(old_inode), BTRFS_I(old_dir),
-                               parent);
+               ret = btrfs_log_new_name(trans, BTRFS_I(old_inode),
+                                        BTRFS_I(old_dir), parent,
+                                        false, &ctx_root);
+               if (ret == BTRFS_NEED_LOG_SYNC)
+                       sync_log_root = true;
+               else if (ret == BTRFS_NEED_TRANS_COMMIT)
+                       commit_transaction = true;
+               ret = 0;
                btrfs_end_log_trans(root);
                root_log_pinned = false;
        }
        if (dest_log_pinned) {
-               parent = old_dentry->d_parent;
-               btrfs_log_new_name(trans, BTRFS_I(new_inode), BTRFS_I(new_dir),
-                               parent);
+               if (!commit_transaction) {
+                       parent = old_dentry->d_parent;
+                       ret = btrfs_log_new_name(trans, BTRFS_I(new_inode),
+                                                BTRFS_I(new_dir), parent,
+                                                false, &ctx_dest);
+                       if (ret == BTRFS_NEED_LOG_SYNC)
+                               sync_log_dest = true;
+                       else if (ret == BTRFS_NEED_TRANS_COMMIT)
+                               commit_transaction = true;
+                       ret = 0;
+               }
                btrfs_end_log_trans(dest);
                dest_log_pinned = false;
        }
@@ -9583,8 +9594,26 @@ out_fail:
                        dest_log_pinned = false;
                }
        }
-       ret2 = btrfs_end_transaction(trans);
-       ret = ret ? ret : ret2;
+       if (!ret && sync_log_root && !commit_transaction) {
+               ret = btrfs_sync_log(trans, BTRFS_I(old_inode)->root,
+                                    &ctx_root);
+               if (ret)
+                       commit_transaction = true;
+       }
+       if (!ret && sync_log_dest && !commit_transaction) {
+               ret = btrfs_sync_log(trans, BTRFS_I(new_inode)->root,
+                                    &ctx_dest);
+               if (ret)
+                       commit_transaction = true;
+       }
+       if (commit_transaction) {
+               ret = btrfs_commit_transaction(trans);
+       } else {
+               int ret2;
+
+               ret2 = btrfs_end_transaction(trans);
+               ret = ret ? ret : ret2;
+       }
 out_notrans:
        if (new_ino == BTRFS_FIRST_FREE_OBJECTID)
                up_read(&fs_info->subvol_sem);
@@ -9661,6 +9690,9 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
        int ret;
        u64 old_ino = btrfs_ino(BTRFS_I(old_inode));
        bool log_pinned = false;
+       struct btrfs_log_ctx ctx;
+       bool sync_log = false;
+       bool commit_transaction = false;
 
        if (btrfs_ino(BTRFS_I(new_dir)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
                return -EPERM;
@@ -9818,8 +9850,15 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
        if (log_pinned) {
                struct dentry *parent = new_dentry->d_parent;
 
-               btrfs_log_new_name(trans, BTRFS_I(old_inode), BTRFS_I(old_dir),
-                               parent);
+               btrfs_init_log_ctx(&ctx, old_inode);
+               ret = btrfs_log_new_name(trans, BTRFS_I(old_inode),
+                                        BTRFS_I(old_dir), parent,
+                                        false, &ctx);
+               if (ret == BTRFS_NEED_LOG_SYNC)
+                       sync_log = true;
+               else if (ret == BTRFS_NEED_TRANS_COMMIT)
+                       commit_transaction = true;
+               ret = 0;
                btrfs_end_log_trans(root);
                log_pinned = false;
        }
@@ -9856,7 +9895,19 @@ out_fail:
                btrfs_end_log_trans(root);
                log_pinned = false;
        }
-       btrfs_end_transaction(trans);
+       if (!ret && sync_log) {
+               ret = btrfs_sync_log(trans, BTRFS_I(old_inode)->root, &ctx);
+               if (ret)
+                       commit_transaction = true;
+       }
+       if (commit_transaction) {
+               ret = btrfs_commit_transaction(trans);
+       } else {
+               int ret2;
+
+               ret2 = btrfs_end_transaction(trans);
+               ret = ret ? ret : ret2;
+       }
 out_notrans:
        if (old_ino == BTRFS_FIRST_FREE_OBJECTID)
                up_read(&fs_info->subvol_sem);