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![Sunil Mushran](/assets/img/avatar_default.png)
Patch removes trailing whitespaces. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com>
639 lines
18 KiB
C
639 lines
18 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* uptodate.c
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*
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* Tracking the up-to-date-ness of a local buffer_head with respect to
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* the cluster.
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*
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* Copyright (C) 2002, 2004, 2005 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*
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* Standard buffer head caching flags (uptodate, etc) are insufficient
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* in a clustered environment - a buffer may be marked up to date on
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* our local node but could have been modified by another cluster
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* member. As a result an additional (and performant) caching scheme
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* is required. A further requirement is that we consume as little
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* memory as possible - we never pin buffer_head structures in order
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* to cache them.
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*
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* We track the existence of up to date buffers on the inodes which
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* are associated with them. Because we don't want to pin
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* buffer_heads, this is only a (strong) hint and several other checks
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* are made in the I/O path to ensure that we don't use a stale or
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* invalid buffer without going to disk:
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* - buffer_jbd is used liberally - if a bh is in the journal on
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* this node then it *must* be up to date.
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* - the standard buffer_uptodate() macro is used to detect buffers
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* which may be invalid (even if we have an up to date tracking
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* item for them)
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*
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* For a full understanding of how this code works together, one
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* should read the callers in dlmglue.c, the I/O functions in
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* buffer_head_io.c and ocfs2_journal_access in journal.c
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/buffer_head.h>
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#include <linux/rbtree.h>
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#define MLOG_MASK_PREFIX ML_UPTODATE
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "inode.h"
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#include "uptodate.h"
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struct ocfs2_meta_cache_item {
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struct rb_node c_node;
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sector_t c_block;
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};
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static struct kmem_cache *ocfs2_uptodate_cachep = NULL;
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u64 ocfs2_metadata_cache_owner(struct ocfs2_caching_info *ci)
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{
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BUG_ON(!ci || !ci->ci_ops);
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return ci->ci_ops->co_owner(ci);
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}
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struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci)
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{
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BUG_ON(!ci || !ci->ci_ops);
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return ci->ci_ops->co_get_super(ci);
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}
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static void ocfs2_metadata_cache_lock(struct ocfs2_caching_info *ci)
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{
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BUG_ON(!ci || !ci->ci_ops);
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ci->ci_ops->co_cache_lock(ci);
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}
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static void ocfs2_metadata_cache_unlock(struct ocfs2_caching_info *ci)
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{
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BUG_ON(!ci || !ci->ci_ops);
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ci->ci_ops->co_cache_unlock(ci);
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}
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void ocfs2_metadata_cache_io_lock(struct ocfs2_caching_info *ci)
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{
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BUG_ON(!ci || !ci->ci_ops);
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ci->ci_ops->co_io_lock(ci);
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}
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void ocfs2_metadata_cache_io_unlock(struct ocfs2_caching_info *ci)
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{
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BUG_ON(!ci || !ci->ci_ops);
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ci->ci_ops->co_io_unlock(ci);
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}
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static void ocfs2_metadata_cache_reset(struct ocfs2_caching_info *ci,
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int clear)
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{
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ci->ci_flags |= OCFS2_CACHE_FL_INLINE;
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ci->ci_num_cached = 0;
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if (clear) {
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ci->ci_created_trans = 0;
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ci->ci_last_trans = 0;
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}
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}
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void ocfs2_metadata_cache_init(struct ocfs2_caching_info *ci,
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const struct ocfs2_caching_operations *ops)
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{
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BUG_ON(!ops);
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ci->ci_ops = ops;
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ocfs2_metadata_cache_reset(ci, 1);
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}
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void ocfs2_metadata_cache_exit(struct ocfs2_caching_info *ci)
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{
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ocfs2_metadata_cache_purge(ci);
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ocfs2_metadata_cache_reset(ci, 1);
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}
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/* No lock taken here as 'root' is not expected to be visible to other
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* processes. */
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static unsigned int ocfs2_purge_copied_metadata_tree(struct rb_root *root)
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{
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unsigned int purged = 0;
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struct rb_node *node;
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struct ocfs2_meta_cache_item *item;
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while ((node = rb_last(root)) != NULL) {
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item = rb_entry(node, struct ocfs2_meta_cache_item, c_node);
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mlog(0, "Purge item %llu\n",
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(unsigned long long) item->c_block);
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rb_erase(&item->c_node, root);
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kmem_cache_free(ocfs2_uptodate_cachep, item);
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purged++;
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}
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return purged;
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}
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/* Called from locking and called from ocfs2_clear_inode. Dump the
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* cache for a given inode.
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*
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* This function is a few more lines longer than necessary due to some
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* accounting done here, but I think it's worth tracking down those
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* bugs sooner -- Mark */
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void ocfs2_metadata_cache_purge(struct ocfs2_caching_info *ci)
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{
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unsigned int tree, to_purge, purged;
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struct rb_root root = RB_ROOT;
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BUG_ON(!ci || !ci->ci_ops);
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ocfs2_metadata_cache_lock(ci);
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tree = !(ci->ci_flags & OCFS2_CACHE_FL_INLINE);
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to_purge = ci->ci_num_cached;
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mlog(0, "Purge %u %s items from Owner %llu\n", to_purge,
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tree ? "array" : "tree",
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(unsigned long long)ocfs2_metadata_cache_owner(ci));
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/* If we're a tree, save off the root so that we can safely
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* initialize the cache. We do the work to free tree members
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* without the spinlock. */
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if (tree)
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root = ci->ci_cache.ci_tree;
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ocfs2_metadata_cache_reset(ci, 0);
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ocfs2_metadata_cache_unlock(ci);
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purged = ocfs2_purge_copied_metadata_tree(&root);
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/* If possible, track the number wiped so that we can more
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* easily detect counting errors. Unfortunately, this is only
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* meaningful for trees. */
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if (tree && purged != to_purge)
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mlog(ML_ERROR, "Owner %llu, count = %u, purged = %u\n",
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(unsigned long long)ocfs2_metadata_cache_owner(ci),
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to_purge, purged);
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}
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/* Returns the index in the cache array, -1 if not found.
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* Requires ip_lock. */
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static int ocfs2_search_cache_array(struct ocfs2_caching_info *ci,
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sector_t item)
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{
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int i;
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for (i = 0; i < ci->ci_num_cached; i++) {
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if (item == ci->ci_cache.ci_array[i])
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return i;
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}
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return -1;
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}
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/* Returns the cache item if found, otherwise NULL.
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* Requires ip_lock. */
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static struct ocfs2_meta_cache_item *
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ocfs2_search_cache_tree(struct ocfs2_caching_info *ci,
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sector_t block)
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{
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struct rb_node * n = ci->ci_cache.ci_tree.rb_node;
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struct ocfs2_meta_cache_item *item = NULL;
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while (n) {
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item = rb_entry(n, struct ocfs2_meta_cache_item, c_node);
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if (block < item->c_block)
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n = n->rb_left;
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else if (block > item->c_block)
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n = n->rb_right;
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else
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return item;
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}
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return NULL;
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}
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static int ocfs2_buffer_cached(struct ocfs2_caching_info *ci,
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struct buffer_head *bh)
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{
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int index = -1;
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struct ocfs2_meta_cache_item *item = NULL;
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ocfs2_metadata_cache_lock(ci);
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mlog(0, "Owner %llu, query block %llu (inline = %u)\n",
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(unsigned long long)ocfs2_metadata_cache_owner(ci),
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(unsigned long long) bh->b_blocknr,
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!!(ci->ci_flags & OCFS2_CACHE_FL_INLINE));
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if (ci->ci_flags & OCFS2_CACHE_FL_INLINE)
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index = ocfs2_search_cache_array(ci, bh->b_blocknr);
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else
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item = ocfs2_search_cache_tree(ci, bh->b_blocknr);
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ocfs2_metadata_cache_unlock(ci);
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mlog(0, "index = %d, item = %p\n", index, item);
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return (index != -1) || (item != NULL);
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}
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/* Warning: even if it returns true, this does *not* guarantee that
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* the block is stored in our inode metadata cache.
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*
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* This can be called under lock_buffer()
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*/
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int ocfs2_buffer_uptodate(struct ocfs2_caching_info *ci,
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struct buffer_head *bh)
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{
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/* Doesn't matter if the bh is in our cache or not -- if it's
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* not marked uptodate then we know it can't have correct
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* data. */
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if (!buffer_uptodate(bh))
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return 0;
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/* OCFS2 does not allow multiple nodes to be changing the same
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* block at the same time. */
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if (buffer_jbd(bh))
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return 1;
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/* Ok, locally the buffer is marked as up to date, now search
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* our cache to see if we can trust that. */
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return ocfs2_buffer_cached(ci, bh);
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}
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/*
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* Determine whether a buffer is currently out on a read-ahead request.
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* ci_io_sem should be held to serialize submitters with the logic here.
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*/
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int ocfs2_buffer_read_ahead(struct ocfs2_caching_info *ci,
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struct buffer_head *bh)
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{
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return buffer_locked(bh) && ocfs2_buffer_cached(ci, bh);
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}
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/* Requires ip_lock */
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static void ocfs2_append_cache_array(struct ocfs2_caching_info *ci,
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sector_t block)
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{
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BUG_ON(ci->ci_num_cached >= OCFS2_CACHE_INFO_MAX_ARRAY);
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mlog(0, "block %llu takes position %u\n", (unsigned long long) block,
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ci->ci_num_cached);
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ci->ci_cache.ci_array[ci->ci_num_cached] = block;
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ci->ci_num_cached++;
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}
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/* By now the caller should have checked that the item does *not*
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* exist in the tree.
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* Requires ip_lock. */
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static void __ocfs2_insert_cache_tree(struct ocfs2_caching_info *ci,
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struct ocfs2_meta_cache_item *new)
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{
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sector_t block = new->c_block;
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struct rb_node *parent = NULL;
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struct rb_node **p = &ci->ci_cache.ci_tree.rb_node;
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struct ocfs2_meta_cache_item *tmp;
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mlog(0, "Insert block %llu num = %u\n", (unsigned long long) block,
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ci->ci_num_cached);
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while(*p) {
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parent = *p;
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tmp = rb_entry(parent, struct ocfs2_meta_cache_item, c_node);
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if (block < tmp->c_block)
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p = &(*p)->rb_left;
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else if (block > tmp->c_block)
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p = &(*p)->rb_right;
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else {
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/* This should never happen! */
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mlog(ML_ERROR, "Duplicate block %llu cached!\n",
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(unsigned long long) block);
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BUG();
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}
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}
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rb_link_node(&new->c_node, parent, p);
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rb_insert_color(&new->c_node, &ci->ci_cache.ci_tree);
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ci->ci_num_cached++;
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}
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/* co_cache_lock() must be held */
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static inline int ocfs2_insert_can_use_array(struct ocfs2_caching_info *ci)
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{
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return (ci->ci_flags & OCFS2_CACHE_FL_INLINE) &&
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(ci->ci_num_cached < OCFS2_CACHE_INFO_MAX_ARRAY);
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}
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/* tree should be exactly OCFS2_CACHE_INFO_MAX_ARRAY wide. NULL the
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* pointers in tree after we use them - this allows caller to detect
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* when to free in case of error.
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*
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* The co_cache_lock() must be held. */
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static void ocfs2_expand_cache(struct ocfs2_caching_info *ci,
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struct ocfs2_meta_cache_item **tree)
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{
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int i;
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mlog_bug_on_msg(ci->ci_num_cached != OCFS2_CACHE_INFO_MAX_ARRAY,
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"Owner %llu, num cached = %u, should be %u\n",
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(unsigned long long)ocfs2_metadata_cache_owner(ci),
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ci->ci_num_cached, OCFS2_CACHE_INFO_MAX_ARRAY);
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mlog_bug_on_msg(!(ci->ci_flags & OCFS2_CACHE_FL_INLINE),
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"Owner %llu not marked as inline anymore!\n",
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(unsigned long long)ocfs2_metadata_cache_owner(ci));
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/* Be careful to initialize the tree members *first* because
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* once the ci_tree is used, the array is junk... */
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for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++)
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tree[i]->c_block = ci->ci_cache.ci_array[i];
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ci->ci_flags &= ~OCFS2_CACHE_FL_INLINE;
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ci->ci_cache.ci_tree = RB_ROOT;
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/* this will be set again by __ocfs2_insert_cache_tree */
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ci->ci_num_cached = 0;
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for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++) {
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__ocfs2_insert_cache_tree(ci, tree[i]);
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tree[i] = NULL;
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}
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mlog(0, "Expanded %llu to a tree cache: flags 0x%x, num = %u\n",
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(unsigned long long)ocfs2_metadata_cache_owner(ci),
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ci->ci_flags, ci->ci_num_cached);
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}
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/* Slow path function - memory allocation is necessary. See the
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* comment above ocfs2_set_buffer_uptodate for more information. */
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static void __ocfs2_set_buffer_uptodate(struct ocfs2_caching_info *ci,
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sector_t block,
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int expand_tree)
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{
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int i;
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struct ocfs2_meta_cache_item *new = NULL;
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struct ocfs2_meta_cache_item *tree[OCFS2_CACHE_INFO_MAX_ARRAY] =
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{ NULL, };
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mlog(0, "Owner %llu, block %llu, expand = %d\n",
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(unsigned long long)ocfs2_metadata_cache_owner(ci),
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(unsigned long long)block, expand_tree);
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new = kmem_cache_alloc(ocfs2_uptodate_cachep, GFP_NOFS);
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if (!new) {
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mlog_errno(-ENOMEM);
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return;
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}
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new->c_block = block;
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if (expand_tree) {
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/* Do *not* allocate an array here - the removal code
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* has no way of tracking that. */
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for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++) {
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tree[i] = kmem_cache_alloc(ocfs2_uptodate_cachep,
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GFP_NOFS);
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if (!tree[i]) {
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mlog_errno(-ENOMEM);
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goto out_free;
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}
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/* These are initialized in ocfs2_expand_cache! */
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}
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}
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ocfs2_metadata_cache_lock(ci);
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if (ocfs2_insert_can_use_array(ci)) {
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mlog(0, "Someone cleared the tree underneath us\n");
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/* Ok, items were removed from the cache in between
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* locks. Detect this and revert back to the fast path */
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ocfs2_append_cache_array(ci, block);
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ocfs2_metadata_cache_unlock(ci);
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goto out_free;
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}
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if (expand_tree)
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ocfs2_expand_cache(ci, tree);
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__ocfs2_insert_cache_tree(ci, new);
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ocfs2_metadata_cache_unlock(ci);
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new = NULL;
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out_free:
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if (new)
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kmem_cache_free(ocfs2_uptodate_cachep, new);
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/* If these were used, then ocfs2_expand_cache re-set them to
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* NULL for us. */
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if (tree[0]) {
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for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++)
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if (tree[i])
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kmem_cache_free(ocfs2_uptodate_cachep,
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tree[i]);
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}
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}
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/* Item insertion is guarded by co_io_lock(), so the insertion path takes
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* advantage of this by not rechecking for a duplicate insert during
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* the slow case. Additionally, if the cache needs to be bumped up to
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* a tree, the code will not recheck after acquiring the lock --
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* multiple paths cannot be expanding to a tree at the same time.
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*
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* The slow path takes into account that items can be removed
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* (including the whole tree wiped and reset) when this process it out
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* allocating memory. In those cases, it reverts back to the fast
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* path.
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*
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* Note that this function may actually fail to insert the block if
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* memory cannot be allocated. This is not fatal however (but may
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* result in a performance penalty)
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*
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* Readahead buffers can be passed in here before the I/O request is
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* completed.
|
|
*/
|
|
void ocfs2_set_buffer_uptodate(struct ocfs2_caching_info *ci,
|
|
struct buffer_head *bh)
|
|
{
|
|
int expand;
|
|
|
|
/* The block may very well exist in our cache already, so avoid
|
|
* doing any more work in that case. */
|
|
if (ocfs2_buffer_cached(ci, bh))
|
|
return;
|
|
|
|
mlog(0, "Owner %llu, inserting block %llu\n",
|
|
(unsigned long long)ocfs2_metadata_cache_owner(ci),
|
|
(unsigned long long)bh->b_blocknr);
|
|
|
|
/* No need to recheck under spinlock - insertion is guarded by
|
|
* co_io_lock() */
|
|
ocfs2_metadata_cache_lock(ci);
|
|
if (ocfs2_insert_can_use_array(ci)) {
|
|
/* Fast case - it's an array and there's a free
|
|
* spot. */
|
|
ocfs2_append_cache_array(ci, bh->b_blocknr);
|
|
ocfs2_metadata_cache_unlock(ci);
|
|
return;
|
|
}
|
|
|
|
expand = 0;
|
|
if (ci->ci_flags & OCFS2_CACHE_FL_INLINE) {
|
|
/* We need to bump things up to a tree. */
|
|
expand = 1;
|
|
}
|
|
ocfs2_metadata_cache_unlock(ci);
|
|
|
|
__ocfs2_set_buffer_uptodate(ci, bh->b_blocknr, expand);
|
|
}
|
|
|
|
/* Called against a newly allocated buffer. Most likely nobody should
|
|
* be able to read this sort of metadata while it's still being
|
|
* allocated, but this is careful to take co_io_lock() anyway. */
|
|
void ocfs2_set_new_buffer_uptodate(struct ocfs2_caching_info *ci,
|
|
struct buffer_head *bh)
|
|
{
|
|
/* This should definitely *not* exist in our cache */
|
|
BUG_ON(ocfs2_buffer_cached(ci, bh));
|
|
|
|
set_buffer_uptodate(bh);
|
|
|
|
ocfs2_metadata_cache_io_lock(ci);
|
|
ocfs2_set_buffer_uptodate(ci, bh);
|
|
ocfs2_metadata_cache_io_unlock(ci);
|
|
}
|
|
|
|
/* Requires ip_lock. */
|
|
static void ocfs2_remove_metadata_array(struct ocfs2_caching_info *ci,
|
|
int index)
|
|
{
|
|
sector_t *array = ci->ci_cache.ci_array;
|
|
int bytes;
|
|
|
|
BUG_ON(index < 0 || index >= OCFS2_CACHE_INFO_MAX_ARRAY);
|
|
BUG_ON(index >= ci->ci_num_cached);
|
|
BUG_ON(!ci->ci_num_cached);
|
|
|
|
mlog(0, "remove index %d (num_cached = %u\n", index,
|
|
ci->ci_num_cached);
|
|
|
|
ci->ci_num_cached--;
|
|
|
|
/* don't need to copy if the array is now empty, or if we
|
|
* removed at the tail */
|
|
if (ci->ci_num_cached && index < ci->ci_num_cached) {
|
|
bytes = sizeof(sector_t) * (ci->ci_num_cached - index);
|
|
memmove(&array[index], &array[index + 1], bytes);
|
|
}
|
|
}
|
|
|
|
/* Requires ip_lock. */
|
|
static void ocfs2_remove_metadata_tree(struct ocfs2_caching_info *ci,
|
|
struct ocfs2_meta_cache_item *item)
|
|
{
|
|
mlog(0, "remove block %llu from tree\n",
|
|
(unsigned long long) item->c_block);
|
|
|
|
rb_erase(&item->c_node, &ci->ci_cache.ci_tree);
|
|
ci->ci_num_cached--;
|
|
}
|
|
|
|
static void ocfs2_remove_block_from_cache(struct ocfs2_caching_info *ci,
|
|
sector_t block)
|
|
{
|
|
int index;
|
|
struct ocfs2_meta_cache_item *item = NULL;
|
|
|
|
ocfs2_metadata_cache_lock(ci);
|
|
mlog(0, "Owner %llu, remove %llu, items = %u, array = %u\n",
|
|
(unsigned long long)ocfs2_metadata_cache_owner(ci),
|
|
(unsigned long long) block, ci->ci_num_cached,
|
|
ci->ci_flags & OCFS2_CACHE_FL_INLINE);
|
|
|
|
if (ci->ci_flags & OCFS2_CACHE_FL_INLINE) {
|
|
index = ocfs2_search_cache_array(ci, block);
|
|
if (index != -1)
|
|
ocfs2_remove_metadata_array(ci, index);
|
|
} else {
|
|
item = ocfs2_search_cache_tree(ci, block);
|
|
if (item)
|
|
ocfs2_remove_metadata_tree(ci, item);
|
|
}
|
|
ocfs2_metadata_cache_unlock(ci);
|
|
|
|
if (item)
|
|
kmem_cache_free(ocfs2_uptodate_cachep, item);
|
|
}
|
|
|
|
/*
|
|
* Called when we remove a chunk of metadata from an inode. We don't
|
|
* bother reverting things to an inlined array in the case of a remove
|
|
* which moves us back under the limit.
|
|
*/
|
|
void ocfs2_remove_from_cache(struct ocfs2_caching_info *ci,
|
|
struct buffer_head *bh)
|
|
{
|
|
sector_t block = bh->b_blocknr;
|
|
|
|
ocfs2_remove_block_from_cache(ci, block);
|
|
}
|
|
|
|
/* Called when we remove xattr clusters from an inode. */
|
|
void ocfs2_remove_xattr_clusters_from_cache(struct ocfs2_caching_info *ci,
|
|
sector_t block,
|
|
u32 c_len)
|
|
{
|
|
struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
|
|
unsigned int i, b_len = ocfs2_clusters_to_blocks(sb, 1) * c_len;
|
|
|
|
for (i = 0; i < b_len; i++, block++)
|
|
ocfs2_remove_block_from_cache(ci, block);
|
|
}
|
|
|
|
int __init init_ocfs2_uptodate_cache(void)
|
|
{
|
|
ocfs2_uptodate_cachep = kmem_cache_create("ocfs2_uptodate",
|
|
sizeof(struct ocfs2_meta_cache_item),
|
|
0, SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!ocfs2_uptodate_cachep)
|
|
return -ENOMEM;
|
|
|
|
mlog(0, "%u inlined cache items per inode.\n",
|
|
OCFS2_CACHE_INFO_MAX_ARRAY);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void exit_ocfs2_uptodate_cache(void)
|
|
{
|
|
if (ocfs2_uptodate_cachep)
|
|
kmem_cache_destroy(ocfs2_uptodate_cachep);
|
|
}
|