1159 lines
28 KiB
C
1159 lines
28 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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* localalloc.c
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*
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* Node local data allocation
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*
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* Copyright (C) 2002, 2004 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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#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/bitops.h>
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#define MLOG_MASK_PREFIX ML_DISK_ALLOC
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "dlmglue.h"
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#include "inode.h"
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#include "journal.h"
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#include "localalloc.h"
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#include "suballoc.h"
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#include "super.h"
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#include "sysfile.h"
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#include "buffer_head_io.h"
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#define OCFS2_LOCAL_ALLOC(dinode) (&((dinode)->id2.i_lab))
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static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);
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static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
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struct ocfs2_dinode *alloc,
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u32 numbits);
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static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);
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static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
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handle_t *handle,
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struct ocfs2_dinode *alloc,
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struct inode *main_bm_inode,
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struct buffer_head *main_bm_bh);
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static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
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struct ocfs2_alloc_context **ac,
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struct inode **bitmap_inode,
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struct buffer_head **bitmap_bh);
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static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
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handle_t *handle,
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struct ocfs2_alloc_context *ac);
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static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
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struct inode *local_alloc_inode);
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static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
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{
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return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
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osb->local_alloc_state == OCFS2_LA_ENABLED);
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}
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void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
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unsigned int num_clusters)
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{
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spin_lock(&osb->osb_lock);
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if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
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osb->local_alloc_state == OCFS2_LA_THROTTLED)
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if (num_clusters >= osb->local_alloc_default_bits) {
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cancel_delayed_work(&osb->la_enable_wq);
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osb->local_alloc_state = OCFS2_LA_ENABLED;
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}
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spin_unlock(&osb->osb_lock);
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}
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void ocfs2_la_enable_worker(struct work_struct *work)
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{
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struct ocfs2_super *osb =
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container_of(work, struct ocfs2_super,
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la_enable_wq.work);
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spin_lock(&osb->osb_lock);
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osb->local_alloc_state = OCFS2_LA_ENABLED;
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spin_unlock(&osb->osb_lock);
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}
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/*
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* Tell us whether a given allocation should use the local alloc
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* file. Otherwise, it has to go to the main bitmap.
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*
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* This function does semi-dirty reads of local alloc size and state!
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* This is ok however, as the values are re-checked once under mutex.
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*/
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int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
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{
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int ret = 0;
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int la_bits;
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spin_lock(&osb->osb_lock);
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la_bits = osb->local_alloc_bits;
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if (!ocfs2_la_state_enabled(osb))
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goto bail;
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/* la_bits should be at least twice the size (in clusters) of
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* a new block group. We want to be sure block group
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* allocations go through the local alloc, so allow an
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* allocation to take up to half the bitmap. */
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if (bits > (la_bits / 2))
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goto bail;
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ret = 1;
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bail:
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mlog(0, "state=%d, bits=%llu, la_bits=%d, ret=%d\n",
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osb->local_alloc_state, (unsigned long long)bits, la_bits, ret);
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spin_unlock(&osb->osb_lock);
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return ret;
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}
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int ocfs2_load_local_alloc(struct ocfs2_super *osb)
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{
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int status = 0;
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struct ocfs2_dinode *alloc = NULL;
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struct buffer_head *alloc_bh = NULL;
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u32 num_used;
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struct inode *inode = NULL;
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struct ocfs2_local_alloc *la;
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mlog_entry_void();
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if (osb->local_alloc_bits == 0)
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goto bail;
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if (osb->local_alloc_bits >= osb->bitmap_cpg) {
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mlog(ML_NOTICE, "Requested local alloc window %d is larger "
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"than max possible %u. Using defaults.\n",
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osb->local_alloc_bits, (osb->bitmap_cpg - 1));
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osb->local_alloc_bits =
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ocfs2_megabytes_to_clusters(osb->sb,
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OCFS2_DEFAULT_LOCAL_ALLOC_SIZE);
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}
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/* read the alloc off disk */
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inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
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osb->slot_num);
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if (!inode) {
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status = -EINVAL;
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mlog_errno(status);
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goto bail;
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}
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status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno,
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&alloc_bh, 0, inode);
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if (status < 0) {
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mlog_errno(status);
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goto bail;
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}
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alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
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la = OCFS2_LOCAL_ALLOC(alloc);
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if (!(le32_to_cpu(alloc->i_flags) &
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(OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
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mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
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(unsigned long long)OCFS2_I(inode)->ip_blkno);
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status = -EINVAL;
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goto bail;
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}
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if ((la->la_size == 0) ||
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(le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
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mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
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le16_to_cpu(la->la_size));
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status = -EINVAL;
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goto bail;
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}
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/* do a little verification. */
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num_used = ocfs2_local_alloc_count_bits(alloc);
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/* hopefully the local alloc has always been recovered before
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* we load it. */
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if (num_used
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|| alloc->id1.bitmap1.i_used
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|| alloc->id1.bitmap1.i_total
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|| la->la_bm_off)
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mlog(ML_ERROR, "Local alloc hasn't been recovered!\n"
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"found = %u, set = %u, taken = %u, off = %u\n",
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num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
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le32_to_cpu(alloc->id1.bitmap1.i_total),
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OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
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osb->local_alloc_bh = alloc_bh;
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osb->local_alloc_state = OCFS2_LA_ENABLED;
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bail:
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if (status < 0)
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if (alloc_bh)
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brelse(alloc_bh);
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if (inode)
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iput(inode);
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mlog(0, "Local alloc window bits = %d\n", osb->local_alloc_bits);
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mlog_exit(status);
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return status;
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}
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/*
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* return any unused bits to the bitmap and write out a clean
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* local_alloc.
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*
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* local_alloc_bh is optional. If not passed, we will simply use the
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* one off osb. If you do pass it however, be warned that it *will* be
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* returned brelse'd and NULL'd out.*/
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void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
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{
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int status;
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handle_t *handle;
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struct inode *local_alloc_inode = NULL;
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struct buffer_head *bh = NULL;
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struct buffer_head *main_bm_bh = NULL;
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struct inode *main_bm_inode = NULL;
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struct ocfs2_dinode *alloc_copy = NULL;
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struct ocfs2_dinode *alloc = NULL;
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mlog_entry_void();
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cancel_delayed_work(&osb->la_enable_wq);
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flush_workqueue(ocfs2_wq);
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if (osb->local_alloc_state == OCFS2_LA_UNUSED)
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goto out;
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local_alloc_inode =
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ocfs2_get_system_file_inode(osb,
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LOCAL_ALLOC_SYSTEM_INODE,
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osb->slot_num);
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if (!local_alloc_inode) {
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status = -ENOENT;
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mlog_errno(status);
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goto out;
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}
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osb->local_alloc_state = OCFS2_LA_DISABLED;
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main_bm_inode = ocfs2_get_system_file_inode(osb,
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GLOBAL_BITMAP_SYSTEM_INODE,
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OCFS2_INVALID_SLOT);
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if (!main_bm_inode) {
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status = -EINVAL;
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mlog_errno(status);
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goto out;
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}
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mutex_lock(&main_bm_inode->i_mutex);
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status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
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if (status < 0) {
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mlog_errno(status);
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goto out_mutex;
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}
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/* WINDOW_MOVE_CREDITS is a bit heavy... */
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handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
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if (IS_ERR(handle)) {
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mlog_errno(PTR_ERR(handle));
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handle = NULL;
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goto out_unlock;
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}
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bh = osb->local_alloc_bh;
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alloc = (struct ocfs2_dinode *) bh->b_data;
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alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
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if (!alloc_copy) {
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status = -ENOMEM;
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goto out_commit;
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}
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memcpy(alloc_copy, alloc, bh->b_size);
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status = ocfs2_journal_access(handle, local_alloc_inode, bh,
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OCFS2_JOURNAL_ACCESS_WRITE);
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if (status < 0) {
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mlog_errno(status);
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goto out_commit;
|
|
}
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|
|
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ocfs2_clear_local_alloc(alloc);
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|
|
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status = ocfs2_journal_dirty(handle, bh);
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if (status < 0) {
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mlog_errno(status);
|
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goto out_commit;
|
|
}
|
|
|
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brelse(bh);
|
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osb->local_alloc_bh = NULL;
|
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osb->local_alloc_state = OCFS2_LA_UNUSED;
|
|
|
|
status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
|
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main_bm_inode, main_bm_bh);
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if (status < 0)
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|
mlog_errno(status);
|
|
|
|
out_commit:
|
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ocfs2_commit_trans(osb, handle);
|
|
|
|
out_unlock:
|
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if (main_bm_bh)
|
|
brelse(main_bm_bh);
|
|
|
|
ocfs2_inode_unlock(main_bm_inode, 1);
|
|
|
|
out_mutex:
|
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mutex_unlock(&main_bm_inode->i_mutex);
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iput(main_bm_inode);
|
|
|
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out:
|
|
if (local_alloc_inode)
|
|
iput(local_alloc_inode);
|
|
|
|
if (alloc_copy)
|
|
kfree(alloc_copy);
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
/*
|
|
* We want to free the bitmap bits outside of any recovery context as
|
|
* we'll need a cluster lock to do so, but we must clear the local
|
|
* alloc before giving up the recovered nodes journal. To solve this,
|
|
* we kmalloc a copy of the local alloc before it's change for the
|
|
* caller to process with ocfs2_complete_local_alloc_recovery
|
|
*/
|
|
int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
|
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int slot_num,
|
|
struct ocfs2_dinode **alloc_copy)
|
|
{
|
|
int status = 0;
|
|
struct buffer_head *alloc_bh = NULL;
|
|
struct inode *inode = NULL;
|
|
struct ocfs2_dinode *alloc;
|
|
|
|
mlog_entry("(slot_num = %d)\n", slot_num);
|
|
|
|
*alloc_copy = NULL;
|
|
|
|
inode = ocfs2_get_system_file_inode(osb,
|
|
LOCAL_ALLOC_SYSTEM_INODE,
|
|
slot_num);
|
|
if (!inode) {
|
|
status = -EINVAL;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
|
|
status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno,
|
|
&alloc_bh, 0, inode);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
*alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
|
|
if (!(*alloc_copy)) {
|
|
status = -ENOMEM;
|
|
goto bail;
|
|
}
|
|
memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
|
|
|
|
alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
|
|
ocfs2_clear_local_alloc(alloc);
|
|
|
|
status = ocfs2_write_block(osb, alloc_bh, inode);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
bail:
|
|
if ((status < 0) && (*alloc_copy)) {
|
|
kfree(*alloc_copy);
|
|
*alloc_copy = NULL;
|
|
}
|
|
|
|
if (alloc_bh)
|
|
brelse(alloc_bh);
|
|
|
|
if (inode) {
|
|
mutex_unlock(&inode->i_mutex);
|
|
iput(inode);
|
|
}
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Step 2: By now, we've completed the journal recovery, we've stamped
|
|
* a clean local alloc on disk and dropped the node out of the
|
|
* recovery map. Dlm locks will no longer stall, so lets clear out the
|
|
* main bitmap.
|
|
*/
|
|
int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
|
|
struct ocfs2_dinode *alloc)
|
|
{
|
|
int status;
|
|
handle_t *handle;
|
|
struct buffer_head *main_bm_bh = NULL;
|
|
struct inode *main_bm_inode;
|
|
|
|
mlog_entry_void();
|
|
|
|
main_bm_inode = ocfs2_get_system_file_inode(osb,
|
|
GLOBAL_BITMAP_SYSTEM_INODE,
|
|
OCFS2_INVALID_SLOT);
|
|
if (!main_bm_inode) {
|
|
status = -EINVAL;
|
|
mlog_errno(status);
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&main_bm_inode->i_mutex);
|
|
|
|
status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto out_mutex;
|
|
}
|
|
|
|
handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
|
|
if (IS_ERR(handle)) {
|
|
status = PTR_ERR(handle);
|
|
handle = NULL;
|
|
mlog_errno(status);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* we want the bitmap change to be recorded on disk asap */
|
|
handle->h_sync = 1;
|
|
|
|
status = ocfs2_sync_local_to_main(osb, handle, alloc,
|
|
main_bm_inode, main_bm_bh);
|
|
if (status < 0)
|
|
mlog_errno(status);
|
|
|
|
ocfs2_commit_trans(osb, handle);
|
|
|
|
out_unlock:
|
|
ocfs2_inode_unlock(main_bm_inode, 1);
|
|
|
|
out_mutex:
|
|
mutex_unlock(&main_bm_inode->i_mutex);
|
|
|
|
if (main_bm_bh)
|
|
brelse(main_bm_bh);
|
|
|
|
iput(main_bm_inode);
|
|
|
|
out:
|
|
if (!status)
|
|
ocfs2_init_inode_steal_slot(osb);
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* make sure we've got at least bits_wanted contiguous bits in the
|
|
* local alloc. You lose them when you drop i_mutex.
|
|
*
|
|
* We will add ourselves to the transaction passed in, but may start
|
|
* our own in order to shift windows.
|
|
*/
|
|
int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
|
|
u32 bits_wanted,
|
|
struct ocfs2_alloc_context *ac)
|
|
{
|
|
int status;
|
|
struct ocfs2_dinode *alloc;
|
|
struct inode *local_alloc_inode;
|
|
unsigned int free_bits;
|
|
|
|
mlog_entry_void();
|
|
|
|
BUG_ON(!ac);
|
|
|
|
local_alloc_inode =
|
|
ocfs2_get_system_file_inode(osb,
|
|
LOCAL_ALLOC_SYSTEM_INODE,
|
|
osb->slot_num);
|
|
if (!local_alloc_inode) {
|
|
status = -ENOENT;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
mutex_lock(&local_alloc_inode->i_mutex);
|
|
|
|
/*
|
|
* We must double check state and allocator bits because
|
|
* another process may have changed them while holding i_mutex.
|
|
*/
|
|
spin_lock(&osb->osb_lock);
|
|
if (!ocfs2_la_state_enabled(osb) ||
|
|
(bits_wanted > osb->local_alloc_bits)) {
|
|
spin_unlock(&osb->osb_lock);
|
|
status = -ENOSPC;
|
|
goto bail;
|
|
}
|
|
spin_unlock(&osb->osb_lock);
|
|
|
|
alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
|
|
|
|
#ifdef CONFIG_OCFS2_DEBUG_FS
|
|
if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
|
|
ocfs2_local_alloc_count_bits(alloc)) {
|
|
ocfs2_error(osb->sb, "local alloc inode %llu says it has "
|
|
"%u free bits, but a count shows %u",
|
|
(unsigned long long)le64_to_cpu(alloc->i_blkno),
|
|
le32_to_cpu(alloc->id1.bitmap1.i_used),
|
|
ocfs2_local_alloc_count_bits(alloc));
|
|
status = -EIO;
|
|
goto bail;
|
|
}
|
|
#endif
|
|
|
|
free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
|
|
le32_to_cpu(alloc->id1.bitmap1.i_used);
|
|
if (bits_wanted > free_bits) {
|
|
/* uhoh, window change time. */
|
|
status =
|
|
ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* Under certain conditions, the window slide code
|
|
* might have reduced the number of bits available or
|
|
* disabled the the local alloc entirely. Re-check
|
|
* here and return -ENOSPC if necessary.
|
|
*/
|
|
status = -ENOSPC;
|
|
if (!ocfs2_la_state_enabled(osb))
|
|
goto bail;
|
|
|
|
free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
|
|
le32_to_cpu(alloc->id1.bitmap1.i_used);
|
|
if (bits_wanted > free_bits)
|
|
goto bail;
|
|
}
|
|
|
|
ac->ac_inode = local_alloc_inode;
|
|
/* We should never use localalloc from another slot */
|
|
ac->ac_alloc_slot = osb->slot_num;
|
|
ac->ac_which = OCFS2_AC_USE_LOCAL;
|
|
get_bh(osb->local_alloc_bh);
|
|
ac->ac_bh = osb->local_alloc_bh;
|
|
status = 0;
|
|
bail:
|
|
if (status < 0 && local_alloc_inode) {
|
|
mutex_unlock(&local_alloc_inode->i_mutex);
|
|
iput(local_alloc_inode);
|
|
}
|
|
|
|
mlog(0, "bits=%d, slot=%d, ret=%d\n", bits_wanted, osb->slot_num,
|
|
status);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct ocfs2_alloc_context *ac,
|
|
u32 bits_wanted,
|
|
u32 *bit_off,
|
|
u32 *num_bits)
|
|
{
|
|
int status, start;
|
|
struct inode *local_alloc_inode;
|
|
void *bitmap;
|
|
struct ocfs2_dinode *alloc;
|
|
struct ocfs2_local_alloc *la;
|
|
|
|
mlog_entry_void();
|
|
BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
|
|
|
|
local_alloc_inode = ac->ac_inode;
|
|
alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
|
|
la = OCFS2_LOCAL_ALLOC(alloc);
|
|
|
|
start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted);
|
|
if (start == -1) {
|
|
/* TODO: Shouldn't we just BUG here? */
|
|
status = -ENOSPC;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
bitmap = la->la_bitmap;
|
|
*bit_off = le32_to_cpu(la->la_bm_off) + start;
|
|
/* local alloc is always contiguous by nature -- we never
|
|
* delete bits from it! */
|
|
*num_bits = bits_wanted;
|
|
|
|
status = ocfs2_journal_access(handle, local_alloc_inode,
|
|
osb->local_alloc_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
while(bits_wanted--)
|
|
ocfs2_set_bit(start++, bitmap);
|
|
|
|
le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
|
|
|
|
status = ocfs2_journal_dirty(handle, osb->local_alloc_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = 0;
|
|
bail:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
|
|
{
|
|
int i;
|
|
u8 *buffer;
|
|
u32 count = 0;
|
|
struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
|
|
|
|
mlog_entry_void();
|
|
|
|
buffer = la->la_bitmap;
|
|
for (i = 0; i < le16_to_cpu(la->la_size); i++)
|
|
count += hweight8(buffer[i]);
|
|
|
|
mlog_exit(count);
|
|
return count;
|
|
}
|
|
|
|
static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
|
|
struct ocfs2_dinode *alloc,
|
|
u32 numbits)
|
|
{
|
|
int numfound, bitoff, left, startoff, lastzero;
|
|
void *bitmap = NULL;
|
|
|
|
mlog_entry("(numbits wanted = %u)\n", numbits);
|
|
|
|
if (!alloc->id1.bitmap1.i_total) {
|
|
mlog(0, "No bits in my window!\n");
|
|
bitoff = -1;
|
|
goto bail;
|
|
}
|
|
|
|
bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
|
|
|
|
numfound = bitoff = startoff = 0;
|
|
lastzero = -1;
|
|
left = le32_to_cpu(alloc->id1.bitmap1.i_total);
|
|
while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
|
|
if (bitoff == left) {
|
|
/* mlog(0, "bitoff (%d) == left", bitoff); */
|
|
break;
|
|
}
|
|
/* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
|
|
"numfound = %d\n", bitoff, startoff, numfound);*/
|
|
|
|
/* Ok, we found a zero bit... is it contig. or do we
|
|
* start over?*/
|
|
if (bitoff == startoff) {
|
|
/* we found a zero */
|
|
numfound++;
|
|
startoff++;
|
|
} else {
|
|
/* got a zero after some ones */
|
|
numfound = 1;
|
|
startoff = bitoff+1;
|
|
}
|
|
/* we got everything we needed */
|
|
if (numfound == numbits) {
|
|
/* mlog(0, "Found it all!\n"); */
|
|
break;
|
|
}
|
|
}
|
|
|
|
mlog(0, "Exiting loop, bitoff = %d, numfound = %d\n", bitoff,
|
|
numfound);
|
|
|
|
if (numfound == numbits)
|
|
bitoff = startoff - numfound;
|
|
else
|
|
bitoff = -1;
|
|
|
|
bail:
|
|
mlog_exit(bitoff);
|
|
return bitoff;
|
|
}
|
|
|
|
static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
|
|
{
|
|
struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
|
|
int i;
|
|
mlog_entry_void();
|
|
|
|
alloc->id1.bitmap1.i_total = 0;
|
|
alloc->id1.bitmap1.i_used = 0;
|
|
la->la_bm_off = 0;
|
|
for(i = 0; i < le16_to_cpu(la->la_size); i++)
|
|
la->la_bitmap[i] = 0;
|
|
|
|
mlog_exit_void();
|
|
}
|
|
|
|
#if 0
|
|
/* turn this on and uncomment below to aid debugging window shifts. */
|
|
static void ocfs2_verify_zero_bits(unsigned long *bitmap,
|
|
unsigned int start,
|
|
unsigned int count)
|
|
{
|
|
unsigned int tmp = count;
|
|
while(tmp--) {
|
|
if (ocfs2_test_bit(start + tmp, bitmap)) {
|
|
printk("ocfs2_verify_zero_bits: start = %u, count = "
|
|
"%u\n", start, count);
|
|
printk("ocfs2_verify_zero_bits: bit %u is set!",
|
|
start + tmp);
|
|
BUG();
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* sync the local alloc to main bitmap.
|
|
*
|
|
* assumes you've already locked the main bitmap -- the bitmap inode
|
|
* passed is used for caching.
|
|
*/
|
|
static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct ocfs2_dinode *alloc,
|
|
struct inode *main_bm_inode,
|
|
struct buffer_head *main_bm_bh)
|
|
{
|
|
int status = 0;
|
|
int bit_off, left, count, start;
|
|
u64 la_start_blk;
|
|
u64 blkno;
|
|
void *bitmap;
|
|
struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
|
|
|
|
mlog_entry("total = %u, used = %u\n",
|
|
le32_to_cpu(alloc->id1.bitmap1.i_total),
|
|
le32_to_cpu(alloc->id1.bitmap1.i_used));
|
|
|
|
if (!alloc->id1.bitmap1.i_total) {
|
|
mlog(0, "nothing to sync!\n");
|
|
goto bail;
|
|
}
|
|
|
|
if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
|
|
le32_to_cpu(alloc->id1.bitmap1.i_total)) {
|
|
mlog(0, "all bits were taken!\n");
|
|
goto bail;
|
|
}
|
|
|
|
la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
|
|
le32_to_cpu(la->la_bm_off));
|
|
bitmap = la->la_bitmap;
|
|
start = count = bit_off = 0;
|
|
left = le32_to_cpu(alloc->id1.bitmap1.i_total);
|
|
|
|
while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
|
|
!= -1) {
|
|
if ((bit_off < left) && (bit_off == start)) {
|
|
count++;
|
|
start++;
|
|
continue;
|
|
}
|
|
if (count) {
|
|
blkno = la_start_blk +
|
|
ocfs2_clusters_to_blocks(osb->sb,
|
|
start - count);
|
|
|
|
mlog(0, "freeing %u bits starting at local alloc bit "
|
|
"%u (la_start_blk = %llu, blkno = %llu)\n",
|
|
count, start - count,
|
|
(unsigned long long)la_start_blk,
|
|
(unsigned long long)blkno);
|
|
|
|
status = ocfs2_free_clusters(handle, main_bm_inode,
|
|
main_bm_bh, blkno, count);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
}
|
|
if (bit_off >= left)
|
|
break;
|
|
count = 1;
|
|
start = bit_off + 1;
|
|
}
|
|
|
|
bail:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
enum ocfs2_la_event {
|
|
OCFS2_LA_EVENT_SLIDE, /* Normal window slide. */
|
|
OCFS2_LA_EVENT_FRAGMENTED, /* The global bitmap has
|
|
* enough bits theoretically
|
|
* free, but a contiguous
|
|
* allocation could not be
|
|
* found. */
|
|
OCFS2_LA_EVENT_ENOSPC, /* Global bitmap doesn't have
|
|
* enough bits free to satisfy
|
|
* our request. */
|
|
};
|
|
#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
|
|
/*
|
|
* Given an event, calculate the size of our next local alloc window.
|
|
*
|
|
* This should always be called under i_mutex of the local alloc inode
|
|
* so that local alloc disabling doesn't race with processes trying to
|
|
* use the allocator.
|
|
*
|
|
* Returns the state which the local alloc was left in. This value can
|
|
* be ignored by some paths.
|
|
*/
|
|
static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
|
|
enum ocfs2_la_event event)
|
|
{
|
|
unsigned int bits;
|
|
int state;
|
|
|
|
spin_lock(&osb->osb_lock);
|
|
if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
|
|
WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* ENOSPC and fragmentation are treated similarly for now.
|
|
*/
|
|
if (event == OCFS2_LA_EVENT_ENOSPC ||
|
|
event == OCFS2_LA_EVENT_FRAGMENTED) {
|
|
/*
|
|
* We ran out of contiguous space in the primary
|
|
* bitmap. Drastically reduce the number of bits used
|
|
* by local alloc until we have to disable it.
|
|
*/
|
|
bits = osb->local_alloc_bits >> 1;
|
|
if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
|
|
/*
|
|
* By setting state to THROTTLED, we'll keep
|
|
* the number of local alloc bits used down
|
|
* until an event occurs which would give us
|
|
* reason to assume the bitmap situation might
|
|
* have changed.
|
|
*/
|
|
osb->local_alloc_state = OCFS2_LA_THROTTLED;
|
|
osb->local_alloc_bits = bits;
|
|
} else {
|
|
osb->local_alloc_state = OCFS2_LA_DISABLED;
|
|
}
|
|
queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
|
|
OCFS2_LA_ENABLE_INTERVAL);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* Don't increase the size of the local alloc window until we
|
|
* know we might be able to fulfill the request. Otherwise, we
|
|
* risk bouncing around the global bitmap during periods of
|
|
* low space.
|
|
*/
|
|
if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
|
|
osb->local_alloc_bits = osb->local_alloc_default_bits;
|
|
|
|
out_unlock:
|
|
state = osb->local_alloc_state;
|
|
spin_unlock(&osb->osb_lock);
|
|
|
|
return state;
|
|
}
|
|
|
|
static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
|
|
struct ocfs2_alloc_context **ac,
|
|
struct inode **bitmap_inode,
|
|
struct buffer_head **bitmap_bh)
|
|
{
|
|
int status;
|
|
|
|
*ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
|
|
if (!(*ac)) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
retry_enospc:
|
|
(*ac)->ac_bits_wanted = osb->local_alloc_bits;
|
|
|
|
status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
|
|
if (status == -ENOSPC) {
|
|
if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
|
|
OCFS2_LA_DISABLED)
|
|
goto bail;
|
|
|
|
ocfs2_free_ac_resource(*ac);
|
|
memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
|
|
goto retry_enospc;
|
|
}
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
*bitmap_inode = (*ac)->ac_inode;
|
|
igrab(*bitmap_inode);
|
|
*bitmap_bh = (*ac)->ac_bh;
|
|
get_bh(*bitmap_bh);
|
|
status = 0;
|
|
bail:
|
|
if ((status < 0) && *ac) {
|
|
ocfs2_free_alloc_context(*ac);
|
|
*ac = NULL;
|
|
}
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* pass it the bitmap lock in lock_bh if you have it.
|
|
*/
|
|
static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
|
|
handle_t *handle,
|
|
struct ocfs2_alloc_context *ac)
|
|
{
|
|
int status = 0;
|
|
u32 cluster_off, cluster_count;
|
|
struct ocfs2_dinode *alloc = NULL;
|
|
struct ocfs2_local_alloc *la;
|
|
|
|
mlog_entry_void();
|
|
|
|
alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
|
|
la = OCFS2_LOCAL_ALLOC(alloc);
|
|
|
|
if (alloc->id1.bitmap1.i_total)
|
|
mlog(0, "asking me to alloc a new window over a non-empty "
|
|
"one\n");
|
|
|
|
mlog(0, "Allocating %u clusters for a new window.\n",
|
|
osb->local_alloc_bits);
|
|
|
|
/* Instruct the allocation code to try the most recently used
|
|
* cluster group. We'll re-record the group used this pass
|
|
* below. */
|
|
ac->ac_last_group = osb->la_last_gd;
|
|
|
|
/* we used the generic suballoc reserve function, but we set
|
|
* everything up nicely, so there's no reason why we can't use
|
|
* the more specific cluster api to claim bits. */
|
|
status = ocfs2_claim_clusters(osb, handle, ac, osb->local_alloc_bits,
|
|
&cluster_off, &cluster_count);
|
|
if (status == -ENOSPC) {
|
|
retry_enospc:
|
|
/*
|
|
* Note: We could also try syncing the journal here to
|
|
* allow use of any free bits which the current
|
|
* transaction can't give us access to. --Mark
|
|
*/
|
|
if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
|
|
OCFS2_LA_DISABLED)
|
|
goto bail;
|
|
|
|
status = ocfs2_claim_clusters(osb, handle, ac,
|
|
osb->local_alloc_bits,
|
|
&cluster_off,
|
|
&cluster_count);
|
|
if (status == -ENOSPC)
|
|
goto retry_enospc;
|
|
/*
|
|
* We only shrunk the *minimum* number of in our
|
|
* request - it's entirely possible that the allocator
|
|
* might give us more than we asked for.
|
|
*/
|
|
if (status == 0) {
|
|
spin_lock(&osb->osb_lock);
|
|
osb->local_alloc_bits = cluster_count;
|
|
spin_unlock(&osb->osb_lock);
|
|
}
|
|
}
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
osb->la_last_gd = ac->ac_last_group;
|
|
|
|
la->la_bm_off = cpu_to_le32(cluster_off);
|
|
alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
|
|
/* just in case... In the future when we find space ourselves,
|
|
* we don't have to get all contiguous -- but we'll have to
|
|
* set all previously used bits in bitmap and update
|
|
* la_bits_set before setting the bits in the main bitmap. */
|
|
alloc->id1.bitmap1.i_used = 0;
|
|
memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
|
|
le16_to_cpu(la->la_size));
|
|
|
|
mlog(0, "New window allocated:\n");
|
|
mlog(0, "window la_bm_off = %u\n",
|
|
OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
|
|
mlog(0, "window bits = %u\n", le32_to_cpu(alloc->id1.bitmap1.i_total));
|
|
|
|
bail:
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|
|
/* Note that we do *NOT* lock the local alloc inode here as
|
|
* it's been locked already for us. */
|
|
static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
|
|
struct inode *local_alloc_inode)
|
|
{
|
|
int status = 0;
|
|
struct buffer_head *main_bm_bh = NULL;
|
|
struct inode *main_bm_inode = NULL;
|
|
handle_t *handle = NULL;
|
|
struct ocfs2_dinode *alloc;
|
|
struct ocfs2_dinode *alloc_copy = NULL;
|
|
struct ocfs2_alloc_context *ac = NULL;
|
|
|
|
mlog_entry_void();
|
|
|
|
ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
|
|
|
|
/* This will lock the main bitmap for us. */
|
|
status = ocfs2_local_alloc_reserve_for_window(osb,
|
|
&ac,
|
|
&main_bm_inode,
|
|
&main_bm_bh);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
|
|
if (IS_ERR(handle)) {
|
|
status = PTR_ERR(handle);
|
|
handle = NULL;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
|
|
|
|
/* We want to clear the local alloc before doing anything
|
|
* else, so that if we error later during this operation,
|
|
* local alloc shutdown won't try to double free main bitmap
|
|
* bits. Make a copy so the sync function knows which bits to
|
|
* free. */
|
|
alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
|
|
if (!alloc_copy) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
|
|
|
|
status = ocfs2_journal_access(handle, local_alloc_inode,
|
|
osb->local_alloc_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
ocfs2_clear_local_alloc(alloc);
|
|
|
|
status = ocfs2_journal_dirty(handle, osb->local_alloc_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
|
|
main_bm_inode, main_bm_bh);
|
|
if (status < 0) {
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_local_alloc_new_window(osb, handle, ac);
|
|
if (status < 0) {
|
|
if (status != -ENOSPC)
|
|
mlog_errno(status);
|
|
goto bail;
|
|
}
|
|
|
|
atomic_inc(&osb->alloc_stats.moves);
|
|
|
|
status = 0;
|
|
bail:
|
|
if (handle)
|
|
ocfs2_commit_trans(osb, handle);
|
|
|
|
if (main_bm_bh)
|
|
brelse(main_bm_bh);
|
|
|
|
if (main_bm_inode)
|
|
iput(main_bm_inode);
|
|
|
|
if (alloc_copy)
|
|
kfree(alloc_copy);
|
|
|
|
if (ac)
|
|
ocfs2_free_alloc_context(ac);
|
|
|
|
mlog_exit(status);
|
|
return status;
|
|
}
|
|
|