--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 Red Hat
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#ifndef SCRUBSTACK_H_
+#define SCRUBSTACK_H_
+
+#include "CDir.h"
+#include "CDentry.h"
+#include "CInode.h"
+#include "MDSContext.h"
+#include "ScrubHeader.h"
+
+#include "include/elist.h"
+
+class MDCache;
+class Finisher;
+
+class ScrubStack {
+protected:
+ /// A finisher needed so that we don't re-enter kick_off_scrubs
+ Finisher *finisher;
+
+ /// The stack of dentries we want to scrub
+ elist<CInode*> inode_stack;
+ /// current number of dentries we're actually scrubbing
+ int scrubs_in_progress;
+ ScrubStack *scrubstack; // hack for dout
+ int stack_size;
+
+ class C_KickOffScrubs : public MDSInternalContext {
+ ScrubStack *stack;
+ public:
+ C_KickOffScrubs(MDCache *mdcache, ScrubStack *s);
+ void finish(int r) override { }
+ void complete(int r) override {
+ stack->scrubs_in_progress--;
+ stack->kick_off_scrubs();
+ // don't delete self
+ }
+ };
+ C_KickOffScrubs scrub_kick;
+
+public:
+ MDCache *mdcache;
+ ScrubStack(MDCache *mdc, Finisher *finisher_) :
+ finisher(finisher_),
+ inode_stack(member_offset(CInode, item_scrub)),
+ scrubs_in_progress(0),
+ scrubstack(this),
+ stack_size(0),
+ scrub_kick(mdc, this),
+ mdcache(mdc) {}
+ ~ScrubStack() {
+ assert(inode_stack.empty());
+ assert(!scrubs_in_progress);
+ }
+ /**
+ * Put a inode on the top of the scrub stack, so it is the highest priority.
+ * If there are other scrubs in progress, they will not continue scrubbing new
+ * entries until this one is completed.
+ * @param in The inodey to scrub
+ * @param header The ScrubHeader propagated from whereever this scrub
+ * was initiated
+ */
+ void enqueue_inode_top(CInode *in, const ScrubHeaderRefConst& header,
+ MDSInternalContextBase *on_finish) {
+ enqueue_inode(in, header, on_finish, true);
+ }
+ /** Like enqueue_inode_top, but we wait for all pending scrubs before
+ * starting this one.
+ */
+ void enqueue_inode_bottom(CInode *in, const ScrubHeaderRefConst& header,
+ MDSInternalContextBase *on_finish) {
+ enqueue_inode(in, header, on_finish, false);
+ }
+
+private:
+ /**
+ * Put the inode at either the top or bottom of the stack, with
+ * the given scrub params, and then try and kick off more scrubbing.
+ */
+ void enqueue_inode(CInode *in, const ScrubHeaderRefConst& header,
+ MDSInternalContextBase *on_finish, bool top);
+ void _enqueue_inode(CInode *in, CDentry *parent, const ScrubHeaderRefConst& header,
+ MDSInternalContextBase *on_finish, bool top);
+ /**
+ * Kick off as many scrubs as are appropriate, based on the current
+ * state of the stack.
+ */
+ void kick_off_scrubs();
+ /**
+ * Push a indoe on top of the stack.
+ */
+ inline void push_inode(CInode *in);
+ /**
+ * Push a inode to the bottom of the stack.
+ */
+ inline void push_inode_bottom(CInode *in);
+ /**
+ * Pop the given inode off the stack.
+ */
+ inline void pop_inode(CInode *in);
+
+ /**
+ * Scrub a file inode.
+ * @param in The indoe to scrub
+ */
+ void scrub_file_inode(CInode *in);
+
+ /**
+ * Callback from completion of CInode::validate_disk_state
+ * @param in The inode we were validating
+ * @param r The return status from validate_disk_state
+ * @param result Populated results from validate_disk_state
+ */
+ void _validate_inode_done(CInode *in, int r,
+ const CInode::validated_data &result);
+ friend class C_InodeValidated;
+
+ /**
+ * Make progress on scrubbing a directory-representing dirfrag and
+ * its children..
+ *
+ * 1) Select the next dirfrag which hasn't been scrubbed, and make progress
+ * on it if possible.
+ *
+ * 2) If not, move on to the next dirfrag and start it up, if any.
+ *
+ * 3) If waiting for results from dirfrag scrubs, do nothing.
+ *
+ * 4) If all dirfrags have been scrubbed, scrub my inode.
+ *
+ * @param in The CInode to scrub as a directory
+ * @param added_dentries set to true if we pushed some of our children
+ * onto the ScrubStack
+ * @param is_terminal set to true if there are no descendant dentries
+ * remaining to start scrubbing.
+ * @param done set to true if we and all our children have finished scrubbing
+ */
+ void scrub_dir_inode(CInode *in, bool *added_children, bool *is_terminal,
+ bool *done);
+ /**
+ * Make progress on scrubbing a dirfrag. It may return after each of the
+ * following steps, but will report making progress on each one.
+ *
+ * 1) enqueues the next unscrubbed child directory dentry at the
+ * top of the stack.
+ *
+ * 2) Initiates a scrub on the next unscrubbed file dentry
+ *
+ * If there are scrubs currently in progress on child dentries, no more child
+ * dentries to scrub, and this function is invoked, it will report no
+ * progress. Try again later.
+ *
+ */
+ void scrub_dirfrag(CDir *dir, const ScrubHeaderRefConst& header,
+ bool *added_children, bool *is_terminal, bool *done);
+ /**
+ * Scrub a directory-representing dentry.
+ *
+ * @param in The directory inode we're doing final scrub on.
+ */
+ void scrub_dir_inode_final(CInode *in);
+
+ /**
+ * Get a CDir into memory, and return it if it's already complete.
+ * Otherwise, fetch it and kick off scrubbing when done.
+ *
+ * @param in The Inode to get the next directory from
+ * @param new_dir The CDir we're returning to you. NULL if
+ * not ready yet or there aren't any.
+ * @returns false if you have to wait, true if there's no work
+ * left to do (we returned it, or there are none left in this inode).
+ */
+ bool get_next_cdir(CInode *in, CDir **new_dir);
+
+};
+
+#endif /* SCRUBSTACK_H_ */
Code Review / stor4nfv.git / blobdiff