![Ryusuke Konishi](/assets/img/avatar_default.png)
This will clean up the removal list of segments and the related functions from segment.c and ioctl.c, which have hurt code readability. This elimination is applied by using nilfs_sufile_updatev() previously introduced in the patch ("nilfs2: add sufile function that can modify multiple segment usages"). Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2919 lines
77 KiB
C
2919 lines
77 KiB
C
/*
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* segment.c - NILFS segment constructor.
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* GNU 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 License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Ryusuke Konishi <ryusuke@osrg.net>
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*
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*/
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#include <linux/pagemap.h>
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#include <linux/buffer_head.h>
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#include <linux/writeback.h>
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#include <linux/bio.h>
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#include <linux/completion.h>
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/freezer.h>
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#include <linux/kthread.h>
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#include <linux/crc32.h>
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#include <linux/pagevec.h>
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#include "nilfs.h"
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#include "btnode.h"
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#include "page.h"
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#include "segment.h"
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#include "sufile.h"
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#include "cpfile.h"
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#include "ifile.h"
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#include "segbuf.h"
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/*
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* Segment constructor
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*/
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#define SC_N_INODEVEC 16 /* Size of locally allocated inode vector */
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#define SC_MAX_SEGDELTA 64 /* Upper limit of the number of segments
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appended in collection retry loop */
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/* Construction mode */
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enum {
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SC_LSEG_SR = 1, /* Make a logical segment having a super root */
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SC_LSEG_DSYNC, /* Flush data blocks of a given file and make
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a logical segment without a super root */
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SC_FLUSH_FILE, /* Flush data files, leads to segment writes without
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creating a checkpoint */
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SC_FLUSH_DAT, /* Flush DAT file. This also creates segments without
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a checkpoint */
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};
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/* Stage numbers of dirty block collection */
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enum {
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NILFS_ST_INIT = 0,
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NILFS_ST_GC, /* Collecting dirty blocks for GC */
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NILFS_ST_FILE,
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NILFS_ST_IFILE,
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NILFS_ST_CPFILE,
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NILFS_ST_SUFILE,
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NILFS_ST_DAT,
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NILFS_ST_SR, /* Super root */
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NILFS_ST_DSYNC, /* Data sync blocks */
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NILFS_ST_DONE,
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};
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/* State flags of collection */
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#define NILFS_CF_NODE 0x0001 /* Collecting node blocks */
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#define NILFS_CF_IFILE_STARTED 0x0002 /* IFILE stage has started */
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#define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */
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#define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED)
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/* Operations depending on the construction mode and file type */
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struct nilfs_sc_operations {
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int (*collect_data)(struct nilfs_sc_info *, struct buffer_head *,
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struct inode *);
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int (*collect_node)(struct nilfs_sc_info *, struct buffer_head *,
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struct inode *);
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int (*collect_bmap)(struct nilfs_sc_info *, struct buffer_head *,
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struct inode *);
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void (*write_data_binfo)(struct nilfs_sc_info *,
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struct nilfs_segsum_pointer *,
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union nilfs_binfo *);
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void (*write_node_binfo)(struct nilfs_sc_info *,
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struct nilfs_segsum_pointer *,
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union nilfs_binfo *);
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};
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/*
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* Other definitions
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*/
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static void nilfs_segctor_start_timer(struct nilfs_sc_info *);
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static void nilfs_segctor_do_flush(struct nilfs_sc_info *, int);
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static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *);
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static void nilfs_dispose_list(struct nilfs_sb_info *, struct list_head *,
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int);
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#define nilfs_cnt32_gt(a, b) \
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(typecheck(__u32, a) && typecheck(__u32, b) && \
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((__s32)(b) - (__s32)(a) < 0))
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#define nilfs_cnt32_ge(a, b) \
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(typecheck(__u32, a) && typecheck(__u32, b) && \
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((__s32)(a) - (__s32)(b) >= 0))
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#define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a)
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#define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a)
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/*
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* Transaction
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*/
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static struct kmem_cache *nilfs_transaction_cachep;
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/**
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* nilfs_init_transaction_cache - create a cache for nilfs_transaction_info
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*
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* nilfs_init_transaction_cache() creates a slab cache for the struct
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* nilfs_transaction_info.
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*
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* Return Value: On success, it returns 0. On error, one of the following
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* negative error code is returned.
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*
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* %-ENOMEM - Insufficient memory available.
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*/
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int nilfs_init_transaction_cache(void)
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{
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nilfs_transaction_cachep =
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kmem_cache_create("nilfs2_transaction_cache",
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sizeof(struct nilfs_transaction_info),
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0, SLAB_RECLAIM_ACCOUNT, NULL);
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return (nilfs_transaction_cachep == NULL) ? -ENOMEM : 0;
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}
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/**
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* nilfs_detroy_transaction_cache - destroy the cache for transaction info
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*
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* nilfs_destroy_transaction_cache() frees the slab cache for the struct
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* nilfs_transaction_info.
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*/
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void nilfs_destroy_transaction_cache(void)
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{
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kmem_cache_destroy(nilfs_transaction_cachep);
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}
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static int nilfs_prepare_segment_lock(struct nilfs_transaction_info *ti)
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{
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struct nilfs_transaction_info *cur_ti = current->journal_info;
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void *save = NULL;
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if (cur_ti) {
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if (cur_ti->ti_magic == NILFS_TI_MAGIC)
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return ++cur_ti->ti_count;
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else {
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/*
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* If journal_info field is occupied by other FS,
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* it is saved and will be restored on
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* nilfs_transaction_commit().
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*/
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printk(KERN_WARNING
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"NILFS warning: journal info from a different "
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"FS\n");
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save = current->journal_info;
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}
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}
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if (!ti) {
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ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS);
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if (!ti)
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return -ENOMEM;
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ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC;
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} else {
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ti->ti_flags = 0;
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}
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ti->ti_count = 0;
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ti->ti_save = save;
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ti->ti_magic = NILFS_TI_MAGIC;
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current->journal_info = ti;
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return 0;
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}
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/**
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* nilfs_transaction_begin - start indivisible file operations.
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* @sb: super block
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* @ti: nilfs_transaction_info
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* @vacancy_check: flags for vacancy rate checks
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*
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* nilfs_transaction_begin() acquires a reader/writer semaphore, called
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* the segment semaphore, to make a segment construction and write tasks
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* exclusive. The function is used with nilfs_transaction_commit() in pairs.
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* The region enclosed by these two functions can be nested. To avoid a
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* deadlock, the semaphore is only acquired or released in the outermost call.
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*
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* This function allocates a nilfs_transaction_info struct to keep context
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* information on it. It is initialized and hooked onto the current task in
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* the outermost call. If a pre-allocated struct is given to @ti, it is used
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* instead; othewise a new struct is assigned from a slab.
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*
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* When @vacancy_check flag is set, this function will check the amount of
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* free space, and will wait for the GC to reclaim disk space if low capacity.
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*
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* Return Value: On success, 0 is returned. On error, one of the following
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* negative error code is returned.
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*
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* %-ENOMEM - Insufficient memory available.
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*
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* %-ENOSPC - No space left on device
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*/
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int nilfs_transaction_begin(struct super_block *sb,
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struct nilfs_transaction_info *ti,
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int vacancy_check)
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{
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struct nilfs_sb_info *sbi;
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struct the_nilfs *nilfs;
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int ret = nilfs_prepare_segment_lock(ti);
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if (unlikely(ret < 0))
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return ret;
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if (ret > 0)
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return 0;
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sbi = NILFS_SB(sb);
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nilfs = sbi->s_nilfs;
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down_read(&nilfs->ns_segctor_sem);
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if (vacancy_check && nilfs_near_disk_full(nilfs)) {
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up_read(&nilfs->ns_segctor_sem);
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ret = -ENOSPC;
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goto failed;
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}
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return 0;
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failed:
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ti = current->journal_info;
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current->journal_info = ti->ti_save;
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if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
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kmem_cache_free(nilfs_transaction_cachep, ti);
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return ret;
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}
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/**
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* nilfs_transaction_commit - commit indivisible file operations.
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* @sb: super block
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*
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* nilfs_transaction_commit() releases the read semaphore which is
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* acquired by nilfs_transaction_begin(). This is only performed
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* in outermost call of this function. If a commit flag is set,
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* nilfs_transaction_commit() sets a timer to start the segment
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* constructor. If a sync flag is set, it starts construction
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* directly.
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*/
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int nilfs_transaction_commit(struct super_block *sb)
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{
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struct nilfs_transaction_info *ti = current->journal_info;
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struct nilfs_sb_info *sbi;
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struct nilfs_sc_info *sci;
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int err = 0;
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BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
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ti->ti_flags |= NILFS_TI_COMMIT;
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if (ti->ti_count > 0) {
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ti->ti_count--;
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return 0;
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}
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sbi = NILFS_SB(sb);
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sci = NILFS_SC(sbi);
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if (sci != NULL) {
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if (ti->ti_flags & NILFS_TI_COMMIT)
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nilfs_segctor_start_timer(sci);
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if (atomic_read(&sbi->s_nilfs->ns_ndirtyblks) >
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sci->sc_watermark)
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nilfs_segctor_do_flush(sci, 0);
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}
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up_read(&sbi->s_nilfs->ns_segctor_sem);
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current->journal_info = ti->ti_save;
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if (ti->ti_flags & NILFS_TI_SYNC)
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err = nilfs_construct_segment(sb);
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if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
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kmem_cache_free(nilfs_transaction_cachep, ti);
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return err;
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}
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void nilfs_transaction_abort(struct super_block *sb)
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{
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struct nilfs_transaction_info *ti = current->journal_info;
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BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
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if (ti->ti_count > 0) {
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ti->ti_count--;
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return;
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}
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up_read(&NILFS_SB(sb)->s_nilfs->ns_segctor_sem);
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current->journal_info = ti->ti_save;
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if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
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kmem_cache_free(nilfs_transaction_cachep, ti);
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}
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void nilfs_relax_pressure_in_lock(struct super_block *sb)
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{
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struct nilfs_sb_info *sbi = NILFS_SB(sb);
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struct nilfs_sc_info *sci = NILFS_SC(sbi);
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struct the_nilfs *nilfs = sbi->s_nilfs;
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if (!sci || !sci->sc_flush_request)
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return;
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set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
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up_read(&nilfs->ns_segctor_sem);
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down_write(&nilfs->ns_segctor_sem);
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if (sci->sc_flush_request &&
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test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) {
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struct nilfs_transaction_info *ti = current->journal_info;
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ti->ti_flags |= NILFS_TI_WRITER;
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nilfs_segctor_do_immediate_flush(sci);
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ti->ti_flags &= ~NILFS_TI_WRITER;
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}
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downgrade_write(&nilfs->ns_segctor_sem);
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}
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static void nilfs_transaction_lock(struct nilfs_sb_info *sbi,
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struct nilfs_transaction_info *ti,
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int gcflag)
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{
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struct nilfs_transaction_info *cur_ti = current->journal_info;
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WARN_ON(cur_ti);
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ti->ti_flags = NILFS_TI_WRITER;
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ti->ti_count = 0;
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ti->ti_save = cur_ti;
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ti->ti_magic = NILFS_TI_MAGIC;
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INIT_LIST_HEAD(&ti->ti_garbage);
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current->journal_info = ti;
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for (;;) {
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down_write(&sbi->s_nilfs->ns_segctor_sem);
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if (!test_bit(NILFS_SC_PRIOR_FLUSH, &NILFS_SC(sbi)->sc_flags))
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break;
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nilfs_segctor_do_immediate_flush(NILFS_SC(sbi));
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up_write(&sbi->s_nilfs->ns_segctor_sem);
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yield();
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}
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if (gcflag)
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ti->ti_flags |= NILFS_TI_GC;
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}
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static void nilfs_transaction_unlock(struct nilfs_sb_info *sbi)
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{
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struct nilfs_transaction_info *ti = current->journal_info;
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BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
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BUG_ON(ti->ti_count > 0);
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up_write(&sbi->s_nilfs->ns_segctor_sem);
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current->journal_info = ti->ti_save;
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if (!list_empty(&ti->ti_garbage))
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nilfs_dispose_list(sbi, &ti->ti_garbage, 0);
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}
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static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci,
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struct nilfs_segsum_pointer *ssp,
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unsigned bytes)
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{
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struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
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unsigned blocksize = sci->sc_super->s_blocksize;
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void *p;
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if (unlikely(ssp->offset + bytes > blocksize)) {
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ssp->offset = 0;
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BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh,
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&segbuf->sb_segsum_buffers));
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ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh);
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}
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p = ssp->bh->b_data + ssp->offset;
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ssp->offset += bytes;
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return p;
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}
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/**
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* nilfs_segctor_reset_segment_buffer - reset the current segment buffer
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* @sci: nilfs_sc_info
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*/
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static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci)
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{
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struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
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struct buffer_head *sumbh;
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unsigned sumbytes;
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unsigned flags = 0;
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int err;
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if (nilfs_doing_gc())
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flags = NILFS_SS_GC;
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err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime);
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if (unlikely(err))
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return err;
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sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
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sumbytes = segbuf->sb_sum.sumbytes;
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sci->sc_finfo_ptr.bh = sumbh; sci->sc_finfo_ptr.offset = sumbytes;
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sci->sc_binfo_ptr.bh = sumbh; sci->sc_binfo_ptr.offset = sumbytes;
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sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
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return 0;
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}
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static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci)
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{
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sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
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if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs))
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return -E2BIG; /* The current segment is filled up
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(internal code) */
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sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg);
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return nilfs_segctor_reset_segment_buffer(sci);
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}
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static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci)
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{
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struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
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int err;
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if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) {
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err = nilfs_segctor_feed_segment(sci);
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if (err)
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return err;
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segbuf = sci->sc_curseg;
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}
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err = nilfs_segbuf_extend_payload(segbuf, &sci->sc_super_root);
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if (likely(!err))
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segbuf->sb_sum.flags |= NILFS_SS_SR;
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return err;
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}
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|
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/*
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* Functions for making segment summary and payloads
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*/
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static int nilfs_segctor_segsum_block_required(
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struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp,
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unsigned binfo_size)
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{
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unsigned blocksize = sci->sc_super->s_blocksize;
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/* Size of finfo and binfo is enough small against blocksize */
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return ssp->offset + binfo_size +
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(!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) >
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blocksize;
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}
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|
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static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci,
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struct inode *inode)
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{
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sci->sc_curseg->sb_sum.nfinfo++;
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sci->sc_binfo_ptr = sci->sc_finfo_ptr;
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nilfs_segctor_map_segsum_entry(
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sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo));
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if (inode->i_sb && !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
|
|
set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
|
|
/* skip finfo */
|
|
}
|
|
|
|
static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci,
|
|
struct inode *inode)
|
|
{
|
|
struct nilfs_finfo *finfo;
|
|
struct nilfs_inode_info *ii;
|
|
struct nilfs_segment_buffer *segbuf;
|
|
|
|
if (sci->sc_blk_cnt == 0)
|
|
return;
|
|
|
|
ii = NILFS_I(inode);
|
|
finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr,
|
|
sizeof(*finfo));
|
|
finfo->fi_ino = cpu_to_le64(inode->i_ino);
|
|
finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt);
|
|
finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt);
|
|
finfo->fi_cno = cpu_to_le64(ii->i_cno);
|
|
|
|
segbuf = sci->sc_curseg;
|
|
segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset +
|
|
sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1);
|
|
sci->sc_finfo_ptr = sci->sc_binfo_ptr;
|
|
sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
|
|
}
|
|
|
|
static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci,
|
|
struct buffer_head *bh,
|
|
struct inode *inode,
|
|
unsigned binfo_size)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
int required, err = 0;
|
|
|
|
retry:
|
|
segbuf = sci->sc_curseg;
|
|
required = nilfs_segctor_segsum_block_required(
|
|
sci, &sci->sc_binfo_ptr, binfo_size);
|
|
if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) {
|
|
nilfs_segctor_end_finfo(sci, inode);
|
|
err = nilfs_segctor_feed_segment(sci);
|
|
if (err)
|
|
return err;
|
|
goto retry;
|
|
}
|
|
if (unlikely(required)) {
|
|
err = nilfs_segbuf_extend_segsum(segbuf);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
}
|
|
if (sci->sc_blk_cnt == 0)
|
|
nilfs_segctor_begin_finfo(sci, inode);
|
|
|
|
nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size);
|
|
/* Substitution to vblocknr is delayed until update_blocknr() */
|
|
nilfs_segbuf_add_file_buffer(segbuf, bh);
|
|
sci->sc_blk_cnt++;
|
|
failed:
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_handle_bmap_error(int err, const char *fname,
|
|
struct inode *inode, struct super_block *sb)
|
|
{
|
|
if (err == -EINVAL) {
|
|
nilfs_error(sb, fname, "broken bmap (inode=%lu)\n",
|
|
inode->i_ino);
|
|
err = -EIO;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Callback functions that enumerate, mark, and collect dirty blocks
|
|
*/
|
|
static int nilfs_collect_file_data(struct nilfs_sc_info *sci,
|
|
struct buffer_head *bh, struct inode *inode)
|
|
{
|
|
int err;
|
|
|
|
err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
|
|
if (unlikely(err < 0))
|
|
return nilfs_handle_bmap_error(err, __func__, inode,
|
|
sci->sc_super);
|
|
|
|
err = nilfs_segctor_add_file_block(sci, bh, inode,
|
|
sizeof(struct nilfs_binfo_v));
|
|
if (!err)
|
|
sci->sc_datablk_cnt++;
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_collect_file_node(struct nilfs_sc_info *sci,
|
|
struct buffer_head *bh,
|
|
struct inode *inode)
|
|
{
|
|
int err;
|
|
|
|
err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
|
|
if (unlikely(err < 0))
|
|
return nilfs_handle_bmap_error(err, __func__, inode,
|
|
sci->sc_super);
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci,
|
|
struct buffer_head *bh,
|
|
struct inode *inode)
|
|
{
|
|
WARN_ON(!buffer_dirty(bh));
|
|
return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
|
|
}
|
|
|
|
static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci,
|
|
struct nilfs_segsum_pointer *ssp,
|
|
union nilfs_binfo *binfo)
|
|
{
|
|
struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry(
|
|
sci, ssp, sizeof(*binfo_v));
|
|
*binfo_v = binfo->bi_v;
|
|
}
|
|
|
|
static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci,
|
|
struct nilfs_segsum_pointer *ssp,
|
|
union nilfs_binfo *binfo)
|
|
{
|
|
__le64 *vblocknr = nilfs_segctor_map_segsum_entry(
|
|
sci, ssp, sizeof(*vblocknr));
|
|
*vblocknr = binfo->bi_v.bi_vblocknr;
|
|
}
|
|
|
|
struct nilfs_sc_operations nilfs_sc_file_ops = {
|
|
.collect_data = nilfs_collect_file_data,
|
|
.collect_node = nilfs_collect_file_node,
|
|
.collect_bmap = nilfs_collect_file_bmap,
|
|
.write_data_binfo = nilfs_write_file_data_binfo,
|
|
.write_node_binfo = nilfs_write_file_node_binfo,
|
|
};
|
|
|
|
static int nilfs_collect_dat_data(struct nilfs_sc_info *sci,
|
|
struct buffer_head *bh, struct inode *inode)
|
|
{
|
|
int err;
|
|
|
|
err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
|
|
if (unlikely(err < 0))
|
|
return nilfs_handle_bmap_error(err, __func__, inode,
|
|
sci->sc_super);
|
|
|
|
err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
|
|
if (!err)
|
|
sci->sc_datablk_cnt++;
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci,
|
|
struct buffer_head *bh, struct inode *inode)
|
|
{
|
|
WARN_ON(!buffer_dirty(bh));
|
|
return nilfs_segctor_add_file_block(sci, bh, inode,
|
|
sizeof(struct nilfs_binfo_dat));
|
|
}
|
|
|
|
static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci,
|
|
struct nilfs_segsum_pointer *ssp,
|
|
union nilfs_binfo *binfo)
|
|
{
|
|
__le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp,
|
|
sizeof(*blkoff));
|
|
*blkoff = binfo->bi_dat.bi_blkoff;
|
|
}
|
|
|
|
static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci,
|
|
struct nilfs_segsum_pointer *ssp,
|
|
union nilfs_binfo *binfo)
|
|
{
|
|
struct nilfs_binfo_dat *binfo_dat =
|
|
nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat));
|
|
*binfo_dat = binfo->bi_dat;
|
|
}
|
|
|
|
struct nilfs_sc_operations nilfs_sc_dat_ops = {
|
|
.collect_data = nilfs_collect_dat_data,
|
|
.collect_node = nilfs_collect_file_node,
|
|
.collect_bmap = nilfs_collect_dat_bmap,
|
|
.write_data_binfo = nilfs_write_dat_data_binfo,
|
|
.write_node_binfo = nilfs_write_dat_node_binfo,
|
|
};
|
|
|
|
struct nilfs_sc_operations nilfs_sc_dsync_ops = {
|
|
.collect_data = nilfs_collect_file_data,
|
|
.collect_node = NULL,
|
|
.collect_bmap = NULL,
|
|
.write_data_binfo = nilfs_write_file_data_binfo,
|
|
.write_node_binfo = NULL,
|
|
};
|
|
|
|
static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,
|
|
struct list_head *listp,
|
|
size_t nlimit,
|
|
loff_t start, loff_t end)
|
|
{
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct pagevec pvec;
|
|
pgoff_t index = 0, last = ULONG_MAX;
|
|
size_t ndirties = 0;
|
|
int i;
|
|
|
|
if (unlikely(start != 0 || end != LLONG_MAX)) {
|
|
/*
|
|
* A valid range is given for sync-ing data pages. The
|
|
* range is rounded to per-page; extra dirty buffers
|
|
* may be included if blocksize < pagesize.
|
|
*/
|
|
index = start >> PAGE_SHIFT;
|
|
last = end >> PAGE_SHIFT;
|
|
}
|
|
pagevec_init(&pvec, 0);
|
|
repeat:
|
|
if (unlikely(index > last) ||
|
|
!pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,
|
|
min_t(pgoff_t, last - index,
|
|
PAGEVEC_SIZE - 1) + 1))
|
|
return ndirties;
|
|
|
|
for (i = 0; i < pagevec_count(&pvec); i++) {
|
|
struct buffer_head *bh, *head;
|
|
struct page *page = pvec.pages[i];
|
|
|
|
if (unlikely(page->index > last))
|
|
break;
|
|
|
|
if (mapping->host) {
|
|
lock_page(page);
|
|
if (!page_has_buffers(page))
|
|
create_empty_buffers(page,
|
|
1 << inode->i_blkbits, 0);
|
|
unlock_page(page);
|
|
}
|
|
|
|
bh = head = page_buffers(page);
|
|
do {
|
|
if (!buffer_dirty(bh))
|
|
continue;
|
|
get_bh(bh);
|
|
list_add_tail(&bh->b_assoc_buffers, listp);
|
|
ndirties++;
|
|
if (unlikely(ndirties >= nlimit)) {
|
|
pagevec_release(&pvec);
|
|
cond_resched();
|
|
return ndirties;
|
|
}
|
|
} while (bh = bh->b_this_page, bh != head);
|
|
}
|
|
pagevec_release(&pvec);
|
|
cond_resched();
|
|
goto repeat;
|
|
}
|
|
|
|
static void nilfs_lookup_dirty_node_buffers(struct inode *inode,
|
|
struct list_head *listp)
|
|
{
|
|
struct nilfs_inode_info *ii = NILFS_I(inode);
|
|
struct address_space *mapping = &ii->i_btnode_cache;
|
|
struct pagevec pvec;
|
|
struct buffer_head *bh, *head;
|
|
unsigned int i;
|
|
pgoff_t index = 0;
|
|
|
|
pagevec_init(&pvec, 0);
|
|
|
|
while (pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,
|
|
PAGEVEC_SIZE)) {
|
|
for (i = 0; i < pagevec_count(&pvec); i++) {
|
|
bh = head = page_buffers(pvec.pages[i]);
|
|
do {
|
|
if (buffer_dirty(bh)) {
|
|
get_bh(bh);
|
|
list_add_tail(&bh->b_assoc_buffers,
|
|
listp);
|
|
}
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
}
|
|
pagevec_release(&pvec);
|
|
cond_resched();
|
|
}
|
|
}
|
|
|
|
static void nilfs_dispose_list(struct nilfs_sb_info *sbi,
|
|
struct list_head *head, int force)
|
|
{
|
|
struct nilfs_inode_info *ii, *n;
|
|
struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii;
|
|
unsigned nv = 0;
|
|
|
|
while (!list_empty(head)) {
|
|
spin_lock(&sbi->s_inode_lock);
|
|
list_for_each_entry_safe(ii, n, head, i_dirty) {
|
|
list_del_init(&ii->i_dirty);
|
|
if (force) {
|
|
if (unlikely(ii->i_bh)) {
|
|
brelse(ii->i_bh);
|
|
ii->i_bh = NULL;
|
|
}
|
|
} else if (test_bit(NILFS_I_DIRTY, &ii->i_state)) {
|
|
set_bit(NILFS_I_QUEUED, &ii->i_state);
|
|
list_add_tail(&ii->i_dirty,
|
|
&sbi->s_dirty_files);
|
|
continue;
|
|
}
|
|
ivec[nv++] = ii;
|
|
if (nv == SC_N_INODEVEC)
|
|
break;
|
|
}
|
|
spin_unlock(&sbi->s_inode_lock);
|
|
|
|
for (pii = ivec; nv > 0; pii++, nv--)
|
|
iput(&(*pii)->vfs_inode);
|
|
}
|
|
}
|
|
|
|
static int nilfs_test_metadata_dirty(struct nilfs_sb_info *sbi)
|
|
{
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
int ret = 0;
|
|
|
|
if (nilfs_mdt_fetch_dirty(sbi->s_ifile))
|
|
ret++;
|
|
if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile))
|
|
ret++;
|
|
if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile))
|
|
ret++;
|
|
if (ret || nilfs_doing_gc())
|
|
if (nilfs_mdt_fetch_dirty(nilfs_dat_inode(nilfs)))
|
|
ret++;
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_segctor_clean(struct nilfs_sc_info *sci)
|
|
{
|
|
return list_empty(&sci->sc_dirty_files) &&
|
|
!test_bit(NILFS_SC_DIRTY, &sci->sc_flags) &&
|
|
sci->sc_nfreesegs == 0 &&
|
|
(!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes));
|
|
}
|
|
|
|
static int nilfs_segctor_confirm(struct nilfs_sc_info *sci)
|
|
{
|
|
struct nilfs_sb_info *sbi = sci->sc_sbi;
|
|
int ret = 0;
|
|
|
|
if (nilfs_test_metadata_dirty(sbi))
|
|
set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
|
|
|
|
spin_lock(&sbi->s_inode_lock);
|
|
if (list_empty(&sbi->s_dirty_files) && nilfs_segctor_clean(sci))
|
|
ret++;
|
|
|
|
spin_unlock(&sbi->s_inode_lock);
|
|
return ret;
|
|
}
|
|
|
|
static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci)
|
|
{
|
|
struct nilfs_sb_info *sbi = sci->sc_sbi;
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
|
|
nilfs_mdt_clear_dirty(sbi->s_ifile);
|
|
nilfs_mdt_clear_dirty(nilfs->ns_cpfile);
|
|
nilfs_mdt_clear_dirty(nilfs->ns_sufile);
|
|
nilfs_mdt_clear_dirty(nilfs_dat_inode(nilfs));
|
|
}
|
|
|
|
static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci)
|
|
{
|
|
struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs;
|
|
struct buffer_head *bh_cp;
|
|
struct nilfs_checkpoint *raw_cp;
|
|
int err;
|
|
|
|
/* XXX: this interface will be changed */
|
|
err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1,
|
|
&raw_cp, &bh_cp);
|
|
if (likely(!err)) {
|
|
/* The following code is duplicated with cpfile. But, it is
|
|
needed to collect the checkpoint even if it was not newly
|
|
created */
|
|
nilfs_mdt_mark_buffer_dirty(bh_cp);
|
|
nilfs_mdt_mark_dirty(nilfs->ns_cpfile);
|
|
nilfs_cpfile_put_checkpoint(
|
|
nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
|
|
} else
|
|
WARN_ON(err == -EINVAL || err == -ENOENT);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
|
|
{
|
|
struct nilfs_sb_info *sbi = sci->sc_sbi;
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
struct buffer_head *bh_cp;
|
|
struct nilfs_checkpoint *raw_cp;
|
|
int err;
|
|
|
|
err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0,
|
|
&raw_cp, &bh_cp);
|
|
if (unlikely(err)) {
|
|
WARN_ON(err == -EINVAL || err == -ENOENT);
|
|
goto failed_ibh;
|
|
}
|
|
raw_cp->cp_snapshot_list.ssl_next = 0;
|
|
raw_cp->cp_snapshot_list.ssl_prev = 0;
|
|
raw_cp->cp_inodes_count =
|
|
cpu_to_le64(atomic_read(&sbi->s_inodes_count));
|
|
raw_cp->cp_blocks_count =
|
|
cpu_to_le64(atomic_read(&sbi->s_blocks_count));
|
|
raw_cp->cp_nblk_inc =
|
|
cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc);
|
|
raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime);
|
|
raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno);
|
|
|
|
if (test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
|
|
nilfs_checkpoint_clear_minor(raw_cp);
|
|
else
|
|
nilfs_checkpoint_set_minor(raw_cp);
|
|
|
|
nilfs_write_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode, 1);
|
|
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
|
|
return 0;
|
|
|
|
failed_ibh:
|
|
return err;
|
|
}
|
|
|
|
static void nilfs_fill_in_file_bmap(struct inode *ifile,
|
|
struct nilfs_inode_info *ii)
|
|
|
|
{
|
|
struct buffer_head *ibh;
|
|
struct nilfs_inode *raw_inode;
|
|
|
|
if (test_bit(NILFS_I_BMAP, &ii->i_state)) {
|
|
ibh = ii->i_bh;
|
|
BUG_ON(!ibh);
|
|
raw_inode = nilfs_ifile_map_inode(ifile, ii->vfs_inode.i_ino,
|
|
ibh);
|
|
nilfs_bmap_write(ii->i_bmap, raw_inode);
|
|
nilfs_ifile_unmap_inode(ifile, ii->vfs_inode.i_ino, ibh);
|
|
}
|
|
}
|
|
|
|
static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci,
|
|
struct inode *ifile)
|
|
{
|
|
struct nilfs_inode_info *ii;
|
|
|
|
list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) {
|
|
nilfs_fill_in_file_bmap(ifile, ii);
|
|
set_bit(NILFS_I_COLLECTED, &ii->i_state);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* CRC calculation routines
|
|
*/
|
|
static void nilfs_fill_in_super_root_crc(struct buffer_head *bh_sr, u32 seed)
|
|
{
|
|
struct nilfs_super_root *raw_sr =
|
|
(struct nilfs_super_root *)bh_sr->b_data;
|
|
u32 crc;
|
|
|
|
crc = crc32_le(seed,
|
|
(unsigned char *)raw_sr + sizeof(raw_sr->sr_sum),
|
|
NILFS_SR_BYTES - sizeof(raw_sr->sr_sum));
|
|
raw_sr->sr_sum = cpu_to_le32(crc);
|
|
}
|
|
|
|
static void nilfs_segctor_fill_in_checksums(struct nilfs_sc_info *sci,
|
|
u32 seed)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
|
|
if (sci->sc_super_root)
|
|
nilfs_fill_in_super_root_crc(sci->sc_super_root, seed);
|
|
|
|
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
|
|
nilfs_segbuf_fill_in_segsum_crc(segbuf, seed);
|
|
nilfs_segbuf_fill_in_data_crc(segbuf, seed);
|
|
}
|
|
}
|
|
|
|
static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci,
|
|
struct the_nilfs *nilfs)
|
|
{
|
|
struct buffer_head *bh_sr = sci->sc_super_root;
|
|
struct nilfs_super_root *raw_sr =
|
|
(struct nilfs_super_root *)bh_sr->b_data;
|
|
unsigned isz = nilfs->ns_inode_size;
|
|
|
|
raw_sr->sr_bytes = cpu_to_le16(NILFS_SR_BYTES);
|
|
raw_sr->sr_nongc_ctime
|
|
= cpu_to_le64(nilfs_doing_gc() ?
|
|
nilfs->ns_nongc_ctime : sci->sc_seg_ctime);
|
|
raw_sr->sr_flags = 0;
|
|
|
|
nilfs_mdt_write_inode_direct(
|
|
nilfs_dat_inode(nilfs), bh_sr, NILFS_SR_DAT_OFFSET(isz));
|
|
nilfs_mdt_write_inode_direct(
|
|
nilfs->ns_cpfile, bh_sr, NILFS_SR_CPFILE_OFFSET(isz));
|
|
nilfs_mdt_write_inode_direct(
|
|
nilfs->ns_sufile, bh_sr, NILFS_SR_SUFILE_OFFSET(isz));
|
|
}
|
|
|
|
static void nilfs_redirty_inodes(struct list_head *head)
|
|
{
|
|
struct nilfs_inode_info *ii;
|
|
|
|
list_for_each_entry(ii, head, i_dirty) {
|
|
if (test_bit(NILFS_I_COLLECTED, &ii->i_state))
|
|
clear_bit(NILFS_I_COLLECTED, &ii->i_state);
|
|
}
|
|
}
|
|
|
|
static void nilfs_drop_collected_inodes(struct list_head *head)
|
|
{
|
|
struct nilfs_inode_info *ii;
|
|
|
|
list_for_each_entry(ii, head, i_dirty) {
|
|
if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state))
|
|
continue;
|
|
|
|
clear_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
|
|
set_bit(NILFS_I_UPDATED, &ii->i_state);
|
|
}
|
|
}
|
|
|
|
static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci,
|
|
struct inode *inode,
|
|
struct list_head *listp,
|
|
int (*collect)(struct nilfs_sc_info *,
|
|
struct buffer_head *,
|
|
struct inode *))
|
|
{
|
|
struct buffer_head *bh, *n;
|
|
int err = 0;
|
|
|
|
if (collect) {
|
|
list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) {
|
|
list_del_init(&bh->b_assoc_buffers);
|
|
err = collect(sci, bh, inode);
|
|
brelse(bh);
|
|
if (unlikely(err))
|
|
goto dispose_buffers;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
dispose_buffers:
|
|
while (!list_empty(listp)) {
|
|
bh = list_entry(listp->next, struct buffer_head,
|
|
b_assoc_buffers);
|
|
list_del_init(&bh->b_assoc_buffers);
|
|
brelse(bh);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci)
|
|
{
|
|
/* Remaining number of blocks within segment buffer */
|
|
return sci->sc_segbuf_nblocks -
|
|
(sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks);
|
|
}
|
|
|
|
static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci,
|
|
struct inode *inode,
|
|
struct nilfs_sc_operations *sc_ops)
|
|
{
|
|
LIST_HEAD(data_buffers);
|
|
LIST_HEAD(node_buffers);
|
|
int err;
|
|
|
|
if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
|
|
size_t n, rest = nilfs_segctor_buffer_rest(sci);
|
|
|
|
n = nilfs_lookup_dirty_data_buffers(
|
|
inode, &data_buffers, rest + 1, 0, LLONG_MAX);
|
|
if (n > rest) {
|
|
err = nilfs_segctor_apply_buffers(
|
|
sci, inode, &data_buffers,
|
|
sc_ops->collect_data);
|
|
BUG_ON(!err); /* always receive -E2BIG or true error */
|
|
goto break_or_fail;
|
|
}
|
|
}
|
|
nilfs_lookup_dirty_node_buffers(inode, &node_buffers);
|
|
|
|
if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
|
|
err = nilfs_segctor_apply_buffers(
|
|
sci, inode, &data_buffers, sc_ops->collect_data);
|
|
if (unlikely(err)) {
|
|
/* dispose node list */
|
|
nilfs_segctor_apply_buffers(
|
|
sci, inode, &node_buffers, NULL);
|
|
goto break_or_fail;
|
|
}
|
|
sci->sc_stage.flags |= NILFS_CF_NODE;
|
|
}
|
|
/* Collect node */
|
|
err = nilfs_segctor_apply_buffers(
|
|
sci, inode, &node_buffers, sc_ops->collect_node);
|
|
if (unlikely(err))
|
|
goto break_or_fail;
|
|
|
|
nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers);
|
|
err = nilfs_segctor_apply_buffers(
|
|
sci, inode, &node_buffers, sc_ops->collect_bmap);
|
|
if (unlikely(err))
|
|
goto break_or_fail;
|
|
|
|
nilfs_segctor_end_finfo(sci, inode);
|
|
sci->sc_stage.flags &= ~NILFS_CF_NODE;
|
|
|
|
break_or_fail:
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci,
|
|
struct inode *inode)
|
|
{
|
|
LIST_HEAD(data_buffers);
|
|
size_t n, rest = nilfs_segctor_buffer_rest(sci);
|
|
int err;
|
|
|
|
n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1,
|
|
sci->sc_dsync_start,
|
|
sci->sc_dsync_end);
|
|
|
|
err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers,
|
|
nilfs_collect_file_data);
|
|
if (!err) {
|
|
nilfs_segctor_end_finfo(sci, inode);
|
|
BUG_ON(n > rest);
|
|
/* always receive -E2BIG or true error if n > rest */
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode)
|
|
{
|
|
struct nilfs_sb_info *sbi = sci->sc_sbi;
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
struct list_head *head;
|
|
struct nilfs_inode_info *ii;
|
|
size_t ndone;
|
|
int err = 0;
|
|
|
|
switch (sci->sc_stage.scnt) {
|
|
case NILFS_ST_INIT:
|
|
/* Pre-processes */
|
|
sci->sc_stage.flags = 0;
|
|
|
|
if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) {
|
|
sci->sc_nblk_inc = 0;
|
|
sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN;
|
|
if (mode == SC_LSEG_DSYNC) {
|
|
sci->sc_stage.scnt = NILFS_ST_DSYNC;
|
|
goto dsync_mode;
|
|
}
|
|
}
|
|
|
|
sci->sc_stage.dirty_file_ptr = NULL;
|
|
sci->sc_stage.gc_inode_ptr = NULL;
|
|
if (mode == SC_FLUSH_DAT) {
|
|
sci->sc_stage.scnt = NILFS_ST_DAT;
|
|
goto dat_stage;
|
|
}
|
|
sci->sc_stage.scnt++; /* Fall through */
|
|
case NILFS_ST_GC:
|
|
if (nilfs_doing_gc()) {
|
|
head = &sci->sc_gc_inodes;
|
|
ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr,
|
|
head, i_dirty);
|
|
list_for_each_entry_continue(ii, head, i_dirty) {
|
|
err = nilfs_segctor_scan_file(
|
|
sci, &ii->vfs_inode,
|
|
&nilfs_sc_file_ops);
|
|
if (unlikely(err)) {
|
|
sci->sc_stage.gc_inode_ptr = list_entry(
|
|
ii->i_dirty.prev,
|
|
struct nilfs_inode_info,
|
|
i_dirty);
|
|
goto break_or_fail;
|
|
}
|
|
set_bit(NILFS_I_COLLECTED, &ii->i_state);
|
|
}
|
|
sci->sc_stage.gc_inode_ptr = NULL;
|
|
}
|
|
sci->sc_stage.scnt++; /* Fall through */
|
|
case NILFS_ST_FILE:
|
|
head = &sci->sc_dirty_files;
|
|
ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head,
|
|
i_dirty);
|
|
list_for_each_entry_continue(ii, head, i_dirty) {
|
|
clear_bit(NILFS_I_DIRTY, &ii->i_state);
|
|
|
|
err = nilfs_segctor_scan_file(sci, &ii->vfs_inode,
|
|
&nilfs_sc_file_ops);
|
|
if (unlikely(err)) {
|
|
sci->sc_stage.dirty_file_ptr =
|
|
list_entry(ii->i_dirty.prev,
|
|
struct nilfs_inode_info,
|
|
i_dirty);
|
|
goto break_or_fail;
|
|
}
|
|
/* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */
|
|
/* XXX: required ? */
|
|
}
|
|
sci->sc_stage.dirty_file_ptr = NULL;
|
|
if (mode == SC_FLUSH_FILE) {
|
|
sci->sc_stage.scnt = NILFS_ST_DONE;
|
|
return 0;
|
|
}
|
|
sci->sc_stage.scnt++;
|
|
sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED;
|
|
/* Fall through */
|
|
case NILFS_ST_IFILE:
|
|
err = nilfs_segctor_scan_file(sci, sbi->s_ifile,
|
|
&nilfs_sc_file_ops);
|
|
if (unlikely(err))
|
|
break;
|
|
sci->sc_stage.scnt++;
|
|
/* Creating a checkpoint */
|
|
err = nilfs_segctor_create_checkpoint(sci);
|
|
if (unlikely(err))
|
|
break;
|
|
/* Fall through */
|
|
case NILFS_ST_CPFILE:
|
|
err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile,
|
|
&nilfs_sc_file_ops);
|
|
if (unlikely(err))
|
|
break;
|
|
sci->sc_stage.scnt++; /* Fall through */
|
|
case NILFS_ST_SUFILE:
|
|
err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs,
|
|
sci->sc_nfreesegs, &ndone);
|
|
if (unlikely(err)) {
|
|
nilfs_sufile_cancel_freev(nilfs->ns_sufile,
|
|
sci->sc_freesegs, ndone,
|
|
NULL);
|
|
break;
|
|
}
|
|
sci->sc_stage.flags |= NILFS_CF_SUFREED;
|
|
|
|
err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile,
|
|
&nilfs_sc_file_ops);
|
|
if (unlikely(err))
|
|
break;
|
|
sci->sc_stage.scnt++; /* Fall through */
|
|
case NILFS_ST_DAT:
|
|
dat_stage:
|
|
err = nilfs_segctor_scan_file(sci, nilfs_dat_inode(nilfs),
|
|
&nilfs_sc_dat_ops);
|
|
if (unlikely(err))
|
|
break;
|
|
if (mode == SC_FLUSH_DAT) {
|
|
sci->sc_stage.scnt = NILFS_ST_DONE;
|
|
return 0;
|
|
}
|
|
sci->sc_stage.scnt++; /* Fall through */
|
|
case NILFS_ST_SR:
|
|
if (mode == SC_LSEG_SR) {
|
|
/* Appending a super root */
|
|
err = nilfs_segctor_add_super_root(sci);
|
|
if (unlikely(err))
|
|
break;
|
|
}
|
|
/* End of a logical segment */
|
|
sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
|
|
sci->sc_stage.scnt = NILFS_ST_DONE;
|
|
return 0;
|
|
case NILFS_ST_DSYNC:
|
|
dsync_mode:
|
|
sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT;
|
|
ii = sci->sc_dsync_inode;
|
|
if (!test_bit(NILFS_I_BUSY, &ii->i_state))
|
|
break;
|
|
|
|
err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode);
|
|
if (unlikely(err))
|
|
break;
|
|
sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
|
|
sci->sc_stage.scnt = NILFS_ST_DONE;
|
|
return 0;
|
|
case NILFS_ST_DONE:
|
|
return 0;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
break_or_fail:
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_touch_segusage(struct inode *sufile, __u64 segnum)
|
|
{
|
|
struct buffer_head *bh_su;
|
|
struct nilfs_segment_usage *raw_su;
|
|
int err;
|
|
|
|
err = nilfs_sufile_get_segment_usage(sufile, segnum, &raw_su, &bh_su);
|
|
if (unlikely(err))
|
|
return err;
|
|
nilfs_mdt_mark_buffer_dirty(bh_su);
|
|
nilfs_mdt_mark_dirty(sufile);
|
|
nilfs_sufile_put_segment_usage(sufile, segnum, bh_su);
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci,
|
|
struct the_nilfs *nilfs)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf, *n;
|
|
__u64 nextnum;
|
|
int err;
|
|
|
|
if (list_empty(&sci->sc_segbufs)) {
|
|
segbuf = nilfs_segbuf_new(sci->sc_super);
|
|
if (unlikely(!segbuf))
|
|
return -ENOMEM;
|
|
list_add(&segbuf->sb_list, &sci->sc_segbufs);
|
|
} else
|
|
segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
|
|
|
|
nilfs_segbuf_map(segbuf, nilfs->ns_segnum, nilfs->ns_pseg_offset,
|
|
nilfs);
|
|
|
|
if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
|
|
nilfs_shift_to_next_segment(nilfs);
|
|
nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs);
|
|
}
|
|
sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks;
|
|
|
|
err = nilfs_touch_segusage(nilfs->ns_sufile, segbuf->sb_segnum);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
if (nilfs->ns_segnum == nilfs->ns_nextnum) {
|
|
/* Start from the head of a new full segment */
|
|
err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum);
|
|
if (unlikely(err))
|
|
return err;
|
|
} else
|
|
nextnum = nilfs->ns_nextnum;
|
|
|
|
segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq;
|
|
nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs);
|
|
|
|
/* truncating segment buffers */
|
|
list_for_each_entry_safe_continue(segbuf, n, &sci->sc_segbufs,
|
|
sb_list) {
|
|
list_del_init(&segbuf->sb_list);
|
|
nilfs_segbuf_free(segbuf);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
|
|
struct the_nilfs *nilfs, int nadd)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf, *prev, *n;
|
|
struct inode *sufile = nilfs->ns_sufile;
|
|
__u64 nextnextnum;
|
|
LIST_HEAD(list);
|
|
int err, ret, i;
|
|
|
|
prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
|
|
/*
|
|
* Since the segment specified with nextnum might be allocated during
|
|
* the previous construction, the buffer including its segusage may
|
|
* not be dirty. The following call ensures that the buffer is dirty
|
|
* and will pin the buffer on memory until the sufile is written.
|
|
*/
|
|
err = nilfs_touch_segusage(sufile, prev->sb_nextnum);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
for (i = 0; i < nadd; i++) {
|
|
/* extend segment info */
|
|
err = -ENOMEM;
|
|
segbuf = nilfs_segbuf_new(sci->sc_super);
|
|
if (unlikely(!segbuf))
|
|
goto failed;
|
|
|
|
/* map this buffer to region of segment on-disk */
|
|
nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
|
|
sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks;
|
|
|
|
/* allocate the next next full segment */
|
|
err = nilfs_sufile_alloc(sufile, &nextnextnum);
|
|
if (unlikely(err))
|
|
goto failed_segbuf;
|
|
|
|
segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1;
|
|
nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs);
|
|
|
|
list_add_tail(&segbuf->sb_list, &list);
|
|
prev = segbuf;
|
|
}
|
|
list_splice(&list, sci->sc_segbufs.prev);
|
|
return 0;
|
|
|
|
failed_segbuf:
|
|
nilfs_segbuf_free(segbuf);
|
|
failed:
|
|
list_for_each_entry_safe(segbuf, n, &list, sb_list) {
|
|
ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
|
|
WARN_ON(ret); /* never fails */
|
|
list_del_init(&segbuf->sb_list);
|
|
nilfs_segbuf_free(segbuf);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void nilfs_segctor_free_incomplete_segments(struct nilfs_sc_info *sci,
|
|
struct the_nilfs *nilfs)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
int ret, done = 0;
|
|
|
|
segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
|
|
if (nilfs->ns_nextnum != segbuf->sb_nextnum) {
|
|
ret = nilfs_sufile_free(nilfs->ns_sufile, segbuf->sb_nextnum);
|
|
WARN_ON(ret); /* never fails */
|
|
}
|
|
if (segbuf->sb_io_error) {
|
|
/* Case 1: The first segment failed */
|
|
if (segbuf->sb_pseg_start != segbuf->sb_fseg_start)
|
|
/* Case 1a: Partial segment appended into an existing
|
|
segment */
|
|
nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start,
|
|
segbuf->sb_fseg_end);
|
|
else /* Case 1b: New full segment */
|
|
set_nilfs_discontinued(nilfs);
|
|
done++;
|
|
}
|
|
|
|
list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
|
|
ret = nilfs_sufile_free(nilfs->ns_sufile, segbuf->sb_nextnum);
|
|
WARN_ON(ret); /* never fails */
|
|
if (!done && segbuf->sb_io_error) {
|
|
if (segbuf->sb_segnum != nilfs->ns_nextnum)
|
|
/* Case 2: extended segment (!= next) failed */
|
|
nilfs_sufile_set_error(nilfs->ns_sufile,
|
|
segbuf->sb_segnum);
|
|
done++;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void nilfs_segctor_clear_segment_buffers(struct nilfs_sc_info *sci)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
|
|
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list)
|
|
nilfs_segbuf_clear(segbuf);
|
|
sci->sc_super_root = NULL;
|
|
}
|
|
|
|
static void nilfs_segctor_destroy_segment_buffers(struct nilfs_sc_info *sci)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
|
|
while (!list_empty(&sci->sc_segbufs)) {
|
|
segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
|
|
list_del_init(&segbuf->sb_list);
|
|
nilfs_segbuf_free(segbuf);
|
|
}
|
|
/* sci->sc_curseg = NULL; */
|
|
}
|
|
|
|
static void nilfs_segctor_end_construction(struct nilfs_sc_info *sci,
|
|
struct the_nilfs *nilfs, int err)
|
|
{
|
|
if (unlikely(err)) {
|
|
nilfs_segctor_free_incomplete_segments(sci, nilfs);
|
|
if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
|
|
int ret;
|
|
|
|
ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
|
|
sci->sc_freesegs,
|
|
sci->sc_nfreesegs,
|
|
NULL);
|
|
WARN_ON(ret); /* do not happen */
|
|
}
|
|
}
|
|
nilfs_segctor_clear_segment_buffers(sci);
|
|
}
|
|
|
|
static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci,
|
|
struct inode *sufile)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
struct buffer_head *bh_su;
|
|
struct nilfs_segment_usage *raw_su;
|
|
unsigned long live_blocks;
|
|
int ret;
|
|
|
|
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
|
|
ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
|
|
&raw_su, &bh_su);
|
|
WARN_ON(ret); /* always succeed because bh_su is dirty */
|
|
live_blocks = segbuf->sb_sum.nblocks +
|
|
(segbuf->sb_pseg_start - segbuf->sb_fseg_start);
|
|
raw_su->su_lastmod = cpu_to_le64(sci->sc_seg_ctime);
|
|
raw_su->su_nblocks = cpu_to_le32(live_blocks);
|
|
nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum,
|
|
bh_su);
|
|
}
|
|
}
|
|
|
|
static void nilfs_segctor_cancel_segusage(struct nilfs_sc_info *sci,
|
|
struct inode *sufile)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
struct buffer_head *bh_su;
|
|
struct nilfs_segment_usage *raw_su;
|
|
int ret;
|
|
|
|
segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
|
|
ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
|
|
&raw_su, &bh_su);
|
|
WARN_ON(ret); /* always succeed because bh_su is dirty */
|
|
raw_su->su_nblocks = cpu_to_le32(segbuf->sb_pseg_start -
|
|
segbuf->sb_fseg_start);
|
|
nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum, bh_su);
|
|
|
|
list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
|
|
ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
|
|
&raw_su, &bh_su);
|
|
WARN_ON(ret); /* always succeed */
|
|
raw_su->su_nblocks = 0;
|
|
nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum,
|
|
bh_su);
|
|
}
|
|
}
|
|
|
|
static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci,
|
|
struct nilfs_segment_buffer *last,
|
|
struct inode *sufile)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf = last, *n;
|
|
int ret;
|
|
|
|
list_for_each_entry_safe_continue(segbuf, n, &sci->sc_segbufs,
|
|
sb_list) {
|
|
list_del_init(&segbuf->sb_list);
|
|
sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks;
|
|
ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
|
|
WARN_ON(ret);
|
|
nilfs_segbuf_free(segbuf);
|
|
}
|
|
}
|
|
|
|
|
|
static int nilfs_segctor_collect(struct nilfs_sc_info *sci,
|
|
struct the_nilfs *nilfs, int mode)
|
|
{
|
|
struct nilfs_cstage prev_stage = sci->sc_stage;
|
|
int err, nadd = 1;
|
|
|
|
/* Collection retry loop */
|
|
for (;;) {
|
|
sci->sc_super_root = NULL;
|
|
sci->sc_nblk_this_inc = 0;
|
|
sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
|
|
|
|
err = nilfs_segctor_reset_segment_buffer(sci);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
|
|
err = nilfs_segctor_collect_blocks(sci, mode);
|
|
sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
|
|
if (!err)
|
|
break;
|
|
|
|
if (unlikely(err != -E2BIG))
|
|
goto failed;
|
|
|
|
/* The current segment is filled up */
|
|
if (mode != SC_LSEG_SR || sci->sc_stage.scnt < NILFS_ST_CPFILE)
|
|
break;
|
|
|
|
if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
|
|
err = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
|
|
sci->sc_freesegs,
|
|
sci->sc_nfreesegs,
|
|
NULL);
|
|
WARN_ON(err); /* do not happen */
|
|
}
|
|
nilfs_segctor_clear_segment_buffers(sci);
|
|
|
|
err = nilfs_segctor_extend_segments(sci, nilfs, nadd);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA);
|
|
sci->sc_stage = prev_stage;
|
|
}
|
|
nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile);
|
|
return 0;
|
|
|
|
failed:
|
|
return err;
|
|
}
|
|
|
|
static void nilfs_list_replace_buffer(struct buffer_head *old_bh,
|
|
struct buffer_head *new_bh)
|
|
{
|
|
BUG_ON(!list_empty(&new_bh->b_assoc_buffers));
|
|
|
|
list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers);
|
|
/* The caller must release old_bh */
|
|
}
|
|
|
|
static int
|
|
nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci,
|
|
struct nilfs_segment_buffer *segbuf,
|
|
int mode)
|
|
{
|
|
struct inode *inode = NULL;
|
|
sector_t blocknr;
|
|
unsigned long nfinfo = segbuf->sb_sum.nfinfo;
|
|
unsigned long nblocks = 0, ndatablk = 0;
|
|
struct nilfs_sc_operations *sc_op = NULL;
|
|
struct nilfs_segsum_pointer ssp;
|
|
struct nilfs_finfo *finfo = NULL;
|
|
union nilfs_binfo binfo;
|
|
struct buffer_head *bh, *bh_org;
|
|
ino_t ino = 0;
|
|
int err = 0;
|
|
|
|
if (!nfinfo)
|
|
goto out;
|
|
|
|
blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk;
|
|
ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
|
|
ssp.offset = sizeof(struct nilfs_segment_summary);
|
|
|
|
list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
|
|
if (bh == sci->sc_super_root)
|
|
break;
|
|
if (!finfo) {
|
|
finfo = nilfs_segctor_map_segsum_entry(
|
|
sci, &ssp, sizeof(*finfo));
|
|
ino = le64_to_cpu(finfo->fi_ino);
|
|
nblocks = le32_to_cpu(finfo->fi_nblocks);
|
|
ndatablk = le32_to_cpu(finfo->fi_ndatablk);
|
|
|
|
if (buffer_nilfs_node(bh))
|
|
inode = NILFS_BTNC_I(bh->b_page->mapping);
|
|
else
|
|
inode = NILFS_AS_I(bh->b_page->mapping);
|
|
|
|
if (mode == SC_LSEG_DSYNC)
|
|
sc_op = &nilfs_sc_dsync_ops;
|
|
else if (ino == NILFS_DAT_INO)
|
|
sc_op = &nilfs_sc_dat_ops;
|
|
else /* file blocks */
|
|
sc_op = &nilfs_sc_file_ops;
|
|
}
|
|
bh_org = bh;
|
|
get_bh(bh_org);
|
|
err = nilfs_bmap_assign(NILFS_I(inode)->i_bmap, &bh, blocknr,
|
|
&binfo);
|
|
if (bh != bh_org)
|
|
nilfs_list_replace_buffer(bh_org, bh);
|
|
brelse(bh_org);
|
|
if (unlikely(err))
|
|
goto failed_bmap;
|
|
|
|
if (ndatablk > 0)
|
|
sc_op->write_data_binfo(sci, &ssp, &binfo);
|
|
else
|
|
sc_op->write_node_binfo(sci, &ssp, &binfo);
|
|
|
|
blocknr++;
|
|
if (--nblocks == 0) {
|
|
finfo = NULL;
|
|
if (--nfinfo == 0)
|
|
break;
|
|
} else if (ndatablk > 0)
|
|
ndatablk--;
|
|
}
|
|
out:
|
|
return 0;
|
|
|
|
failed_bmap:
|
|
err = nilfs_handle_bmap_error(err, __func__, inode, sci->sc_super);
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
int err;
|
|
|
|
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
|
|
err = nilfs_segctor_update_payload_blocknr(sci, segbuf, mode);
|
|
if (unlikely(err))
|
|
return err;
|
|
nilfs_segbuf_fill_in_segsum(segbuf);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
nilfs_copy_replace_page_buffers(struct page *page, struct list_head *out)
|
|
{
|
|
struct page *clone_page;
|
|
struct buffer_head *bh, *head, *bh2;
|
|
void *kaddr;
|
|
|
|
bh = head = page_buffers(page);
|
|
|
|
clone_page = nilfs_alloc_private_page(bh->b_bdev, bh->b_size, 0);
|
|
if (unlikely(!clone_page))
|
|
return -ENOMEM;
|
|
|
|
bh2 = page_buffers(clone_page);
|
|
kaddr = kmap_atomic(page, KM_USER0);
|
|
do {
|
|
if (list_empty(&bh->b_assoc_buffers))
|
|
continue;
|
|
get_bh(bh2);
|
|
page_cache_get(clone_page); /* for each bh */
|
|
memcpy(bh2->b_data, kaddr + bh_offset(bh), bh2->b_size);
|
|
bh2->b_blocknr = bh->b_blocknr;
|
|
list_replace(&bh->b_assoc_buffers, &bh2->b_assoc_buffers);
|
|
list_add_tail(&bh->b_assoc_buffers, out);
|
|
} while (bh = bh->b_this_page, bh2 = bh2->b_this_page, bh != head);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
|
|
if (!TestSetPageWriteback(clone_page))
|
|
inc_zone_page_state(clone_page, NR_WRITEBACK);
|
|
unlock_page(clone_page);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_test_page_to_be_frozen(struct page *page)
|
|
{
|
|
struct address_space *mapping = page->mapping;
|
|
|
|
if (!mapping || !mapping->host || S_ISDIR(mapping->host->i_mode))
|
|
return 0;
|
|
|
|
if (page_mapped(page)) {
|
|
ClearPageChecked(page);
|
|
return 1;
|
|
}
|
|
return PageChecked(page);
|
|
}
|
|
|
|
static int nilfs_begin_page_io(struct page *page, struct list_head *out)
|
|
{
|
|
if (!page || PageWriteback(page))
|
|
/* For split b-tree node pages, this function may be called
|
|
twice. We ignore the 2nd or later calls by this check. */
|
|
return 0;
|
|
|
|
lock_page(page);
|
|
clear_page_dirty_for_io(page);
|
|
set_page_writeback(page);
|
|
unlock_page(page);
|
|
|
|
if (nilfs_test_page_to_be_frozen(page)) {
|
|
int err = nilfs_copy_replace_page_buffers(page, out);
|
|
if (unlikely(err))
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_segctor_prepare_write(struct nilfs_sc_info *sci,
|
|
struct page **failed_page)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
struct page *bd_page = NULL, *fs_page = NULL;
|
|
struct list_head *list = &sci->sc_copied_buffers;
|
|
int err;
|
|
|
|
*failed_page = NULL;
|
|
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
|
|
struct buffer_head *bh;
|
|
|
|
list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
|
|
b_assoc_buffers) {
|
|
if (bh->b_page != bd_page) {
|
|
if (bd_page) {
|
|
lock_page(bd_page);
|
|
clear_page_dirty_for_io(bd_page);
|
|
set_page_writeback(bd_page);
|
|
unlock_page(bd_page);
|
|
}
|
|
bd_page = bh->b_page;
|
|
}
|
|
}
|
|
|
|
list_for_each_entry(bh, &segbuf->sb_payload_buffers,
|
|
b_assoc_buffers) {
|
|
if (bh == sci->sc_super_root) {
|
|
if (bh->b_page != bd_page) {
|
|
lock_page(bd_page);
|
|
clear_page_dirty_for_io(bd_page);
|
|
set_page_writeback(bd_page);
|
|
unlock_page(bd_page);
|
|
bd_page = bh->b_page;
|
|
}
|
|
break;
|
|
}
|
|
if (bh->b_page != fs_page) {
|
|
err = nilfs_begin_page_io(fs_page, list);
|
|
if (unlikely(err)) {
|
|
*failed_page = fs_page;
|
|
goto out;
|
|
}
|
|
fs_page = bh->b_page;
|
|
}
|
|
}
|
|
}
|
|
if (bd_page) {
|
|
lock_page(bd_page);
|
|
clear_page_dirty_for_io(bd_page);
|
|
set_page_writeback(bd_page);
|
|
unlock_page(bd_page);
|
|
}
|
|
err = nilfs_begin_page_io(fs_page, list);
|
|
if (unlikely(err))
|
|
*failed_page = fs_page;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int nilfs_segctor_write(struct nilfs_sc_info *sci,
|
|
struct backing_dev_info *bdi)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
struct nilfs_write_info wi;
|
|
int err, res;
|
|
|
|
wi.sb = sci->sc_super;
|
|
wi.bh_sr = sci->sc_super_root;
|
|
wi.bdi = bdi;
|
|
|
|
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
|
|
nilfs_segbuf_prepare_write(segbuf, &wi);
|
|
err = nilfs_segbuf_write(segbuf, &wi);
|
|
|
|
res = nilfs_segbuf_wait(segbuf, &wi);
|
|
err = unlikely(err) ? : res;
|
|
if (unlikely(err))
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_page_has_uncleared_buffer(struct page *page)
|
|
{
|
|
struct buffer_head *head, *bh;
|
|
|
|
head = bh = page_buffers(page);
|
|
do {
|
|
if (buffer_dirty(bh) && !list_empty(&bh->b_assoc_buffers))
|
|
return 1;
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
return 0;
|
|
}
|
|
|
|
static void __nilfs_end_page_io(struct page *page, int err)
|
|
{
|
|
if (!err) {
|
|
if (!nilfs_page_buffers_clean(page))
|
|
__set_page_dirty_nobuffers(page);
|
|
ClearPageError(page);
|
|
} else {
|
|
__set_page_dirty_nobuffers(page);
|
|
SetPageError(page);
|
|
}
|
|
|
|
if (buffer_nilfs_allocated(page_buffers(page))) {
|
|
if (TestClearPageWriteback(page))
|
|
dec_zone_page_state(page, NR_WRITEBACK);
|
|
} else
|
|
end_page_writeback(page);
|
|
}
|
|
|
|
static void nilfs_end_page_io(struct page *page, int err)
|
|
{
|
|
if (!page)
|
|
return;
|
|
|
|
if (buffer_nilfs_node(page_buffers(page)) &&
|
|
nilfs_page_has_uncleared_buffer(page))
|
|
/* For b-tree node pages, this function may be called twice
|
|
or more because they might be split in a segment.
|
|
This check assures that cleanup has been done for all
|
|
buffers in a split btnode page. */
|
|
return;
|
|
|
|
__nilfs_end_page_io(page, err);
|
|
}
|
|
|
|
static void nilfs_clear_copied_buffers(struct list_head *list, int err)
|
|
{
|
|
struct buffer_head *bh, *head;
|
|
struct page *page;
|
|
|
|
while (!list_empty(list)) {
|
|
bh = list_entry(list->next, struct buffer_head,
|
|
b_assoc_buffers);
|
|
page = bh->b_page;
|
|
page_cache_get(page);
|
|
head = bh = page_buffers(page);
|
|
do {
|
|
if (!list_empty(&bh->b_assoc_buffers)) {
|
|
list_del_init(&bh->b_assoc_buffers);
|
|
if (!err) {
|
|
set_buffer_uptodate(bh);
|
|
clear_buffer_dirty(bh);
|
|
clear_buffer_nilfs_volatile(bh);
|
|
}
|
|
brelse(bh); /* for b_assoc_buffers */
|
|
}
|
|
} while ((bh = bh->b_this_page) != head);
|
|
|
|
__nilfs_end_page_io(page, err);
|
|
page_cache_release(page);
|
|
}
|
|
}
|
|
|
|
static void nilfs_segctor_abort_write(struct nilfs_sc_info *sci,
|
|
struct page *failed_page, int err)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
struct page *bd_page = NULL, *fs_page = NULL;
|
|
|
|
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
|
|
struct buffer_head *bh;
|
|
|
|
list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
|
|
b_assoc_buffers) {
|
|
if (bh->b_page != bd_page) {
|
|
if (bd_page)
|
|
end_page_writeback(bd_page);
|
|
bd_page = bh->b_page;
|
|
}
|
|
}
|
|
|
|
list_for_each_entry(bh, &segbuf->sb_payload_buffers,
|
|
b_assoc_buffers) {
|
|
if (bh == sci->sc_super_root) {
|
|
if (bh->b_page != bd_page) {
|
|
end_page_writeback(bd_page);
|
|
bd_page = bh->b_page;
|
|
}
|
|
break;
|
|
}
|
|
if (bh->b_page != fs_page) {
|
|
nilfs_end_page_io(fs_page, err);
|
|
if (unlikely(fs_page == failed_page))
|
|
goto done;
|
|
fs_page = bh->b_page;
|
|
}
|
|
}
|
|
}
|
|
if (bd_page)
|
|
end_page_writeback(bd_page);
|
|
|
|
nilfs_end_page_io(fs_page, err);
|
|
done:
|
|
nilfs_clear_copied_buffers(&sci->sc_copied_buffers, err);
|
|
}
|
|
|
|
static void nilfs_set_next_segment(struct the_nilfs *nilfs,
|
|
struct nilfs_segment_buffer *segbuf)
|
|
{
|
|
nilfs->ns_segnum = segbuf->sb_segnum;
|
|
nilfs->ns_nextnum = segbuf->sb_nextnum;
|
|
nilfs->ns_pseg_offset = segbuf->sb_pseg_start - segbuf->sb_fseg_start
|
|
+ segbuf->sb_sum.nblocks;
|
|
nilfs->ns_seg_seq = segbuf->sb_sum.seg_seq;
|
|
nilfs->ns_ctime = segbuf->sb_sum.ctime;
|
|
}
|
|
|
|
static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
|
|
{
|
|
struct nilfs_segment_buffer *segbuf;
|
|
struct page *bd_page = NULL, *fs_page = NULL;
|
|
struct nilfs_sb_info *sbi = sci->sc_sbi;
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
int update_sr = (sci->sc_super_root != NULL);
|
|
|
|
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
|
|
struct buffer_head *bh;
|
|
|
|
list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
|
|
b_assoc_buffers) {
|
|
set_buffer_uptodate(bh);
|
|
clear_buffer_dirty(bh);
|
|
if (bh->b_page != bd_page) {
|
|
if (bd_page)
|
|
end_page_writeback(bd_page);
|
|
bd_page = bh->b_page;
|
|
}
|
|
}
|
|
/*
|
|
* We assume that the buffers which belong to the same page
|
|
* continue over the buffer list.
|
|
* Under this assumption, the last BHs of pages is
|
|
* identifiable by the discontinuity of bh->b_page
|
|
* (page != fs_page).
|
|
*
|
|
* For B-tree node blocks, however, this assumption is not
|
|
* guaranteed. The cleanup code of B-tree node pages needs
|
|
* special care.
|
|
*/
|
|
list_for_each_entry(bh, &segbuf->sb_payload_buffers,
|
|
b_assoc_buffers) {
|
|
set_buffer_uptodate(bh);
|
|
clear_buffer_dirty(bh);
|
|
clear_buffer_nilfs_volatile(bh);
|
|
if (bh == sci->sc_super_root) {
|
|
if (bh->b_page != bd_page) {
|
|
end_page_writeback(bd_page);
|
|
bd_page = bh->b_page;
|
|
}
|
|
break;
|
|
}
|
|
if (bh->b_page != fs_page) {
|
|
nilfs_end_page_io(fs_page, 0);
|
|
fs_page = bh->b_page;
|
|
}
|
|
}
|
|
|
|
if (!NILFS_SEG_SIMPLEX(&segbuf->sb_sum)) {
|
|
if (NILFS_SEG_LOGBGN(&segbuf->sb_sum)) {
|
|
set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
|
|
sci->sc_lseg_stime = jiffies;
|
|
}
|
|
if (NILFS_SEG_LOGEND(&segbuf->sb_sum))
|
|
clear_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
|
|
}
|
|
}
|
|
/*
|
|
* Since pages may continue over multiple segment buffers,
|
|
* end of the last page must be checked outside of the loop.
|
|
*/
|
|
if (bd_page)
|
|
end_page_writeback(bd_page);
|
|
|
|
nilfs_end_page_io(fs_page, 0);
|
|
|
|
nilfs_clear_copied_buffers(&sci->sc_copied_buffers, 0);
|
|
|
|
nilfs_drop_collected_inodes(&sci->sc_dirty_files);
|
|
|
|
if (nilfs_doing_gc()) {
|
|
nilfs_drop_collected_inodes(&sci->sc_gc_inodes);
|
|
if (update_sr)
|
|
nilfs_commit_gcdat_inode(nilfs);
|
|
} else
|
|
nilfs->ns_nongc_ctime = sci->sc_seg_ctime;
|
|
|
|
sci->sc_nblk_inc += sci->sc_nblk_this_inc;
|
|
|
|
segbuf = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
|
|
nilfs_set_next_segment(nilfs, segbuf);
|
|
|
|
if (update_sr) {
|
|
nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start,
|
|
segbuf->sb_sum.seg_seq, nilfs->ns_cno++);
|
|
sbi->s_super->s_dirt = 1;
|
|
|
|
clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
|
|
clear_bit(NILFS_SC_DIRTY, &sci->sc_flags);
|
|
set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
|
|
} else
|
|
clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
|
|
}
|
|
|
|
static int nilfs_segctor_check_in_files(struct nilfs_sc_info *sci,
|
|
struct nilfs_sb_info *sbi)
|
|
{
|
|
struct nilfs_inode_info *ii, *n;
|
|
__u64 cno = sbi->s_nilfs->ns_cno;
|
|
|
|
spin_lock(&sbi->s_inode_lock);
|
|
retry:
|
|
list_for_each_entry_safe(ii, n, &sbi->s_dirty_files, i_dirty) {
|
|
if (!ii->i_bh) {
|
|
struct buffer_head *ibh;
|
|
int err;
|
|
|
|
spin_unlock(&sbi->s_inode_lock);
|
|
err = nilfs_ifile_get_inode_block(
|
|
sbi->s_ifile, ii->vfs_inode.i_ino, &ibh);
|
|
if (unlikely(err)) {
|
|
nilfs_warning(sbi->s_super, __func__,
|
|
"failed to get inode block.\n");
|
|
return err;
|
|
}
|
|
nilfs_mdt_mark_buffer_dirty(ibh);
|
|
nilfs_mdt_mark_dirty(sbi->s_ifile);
|
|
spin_lock(&sbi->s_inode_lock);
|
|
if (likely(!ii->i_bh))
|
|
ii->i_bh = ibh;
|
|
else
|
|
brelse(ibh);
|
|
goto retry;
|
|
}
|
|
ii->i_cno = cno;
|
|
|
|
clear_bit(NILFS_I_QUEUED, &ii->i_state);
|
|
set_bit(NILFS_I_BUSY, &ii->i_state);
|
|
list_del(&ii->i_dirty);
|
|
list_add_tail(&ii->i_dirty, &sci->sc_dirty_files);
|
|
}
|
|
spin_unlock(&sbi->s_inode_lock);
|
|
|
|
NILFS_I(sbi->s_ifile)->i_cno = cno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nilfs_segctor_check_out_files(struct nilfs_sc_info *sci,
|
|
struct nilfs_sb_info *sbi)
|
|
{
|
|
struct nilfs_transaction_info *ti = current->journal_info;
|
|
struct nilfs_inode_info *ii, *n;
|
|
__u64 cno = sbi->s_nilfs->ns_cno;
|
|
|
|
spin_lock(&sbi->s_inode_lock);
|
|
list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) {
|
|
if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) ||
|
|
test_bit(NILFS_I_DIRTY, &ii->i_state)) {
|
|
/* The current checkpoint number (=nilfs->ns_cno) is
|
|
changed between check-in and check-out only if the
|
|
super root is written out. So, we can update i_cno
|
|
for the inodes that remain in the dirty list. */
|
|
ii->i_cno = cno;
|
|
continue;
|
|
}
|
|
clear_bit(NILFS_I_BUSY, &ii->i_state);
|
|
brelse(ii->i_bh);
|
|
ii->i_bh = NULL;
|
|
list_del(&ii->i_dirty);
|
|
list_add_tail(&ii->i_dirty, &ti->ti_garbage);
|
|
}
|
|
spin_unlock(&sbi->s_inode_lock);
|
|
}
|
|
|
|
/*
|
|
* Main procedure of segment constructor
|
|
*/
|
|
static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
|
|
{
|
|
struct nilfs_sb_info *sbi = sci->sc_sbi;
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
struct page *failed_page;
|
|
int err, has_sr = 0;
|
|
|
|
sci->sc_stage.scnt = NILFS_ST_INIT;
|
|
|
|
err = nilfs_segctor_check_in_files(sci, sbi);
|
|
if (unlikely(err))
|
|
goto out;
|
|
|
|
if (nilfs_test_metadata_dirty(sbi))
|
|
set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
|
|
|
|
if (nilfs_segctor_clean(sci))
|
|
goto out;
|
|
|
|
do {
|
|
sci->sc_stage.flags &= ~NILFS_CF_HISTORY_MASK;
|
|
|
|
err = nilfs_segctor_begin_construction(sci, nilfs);
|
|
if (unlikely(err))
|
|
goto out;
|
|
|
|
/* Update time stamp */
|
|
sci->sc_seg_ctime = get_seconds();
|
|
|
|
err = nilfs_segctor_collect(sci, nilfs, mode);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
|
|
has_sr = (sci->sc_super_root != NULL);
|
|
|
|
/* Avoid empty segment */
|
|
if (sci->sc_stage.scnt == NILFS_ST_DONE &&
|
|
NILFS_SEG_EMPTY(&sci->sc_curseg->sb_sum)) {
|
|
nilfs_segctor_end_construction(sci, nilfs, 1);
|
|
goto out;
|
|
}
|
|
|
|
err = nilfs_segctor_assign(sci, mode);
|
|
if (unlikely(err))
|
|
goto failed;
|
|
|
|
if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
|
|
nilfs_segctor_fill_in_file_bmap(sci, sbi->s_ifile);
|
|
|
|
if (has_sr) {
|
|
err = nilfs_segctor_fill_in_checkpoint(sci);
|
|
if (unlikely(err))
|
|
goto failed_to_make_up;
|
|
|
|
nilfs_segctor_fill_in_super_root(sci, nilfs);
|
|
}
|
|
nilfs_segctor_update_segusage(sci, nilfs->ns_sufile);
|
|
|
|
/* Write partial segments */
|
|
err = nilfs_segctor_prepare_write(sci, &failed_page);
|
|
if (unlikely(err))
|
|
goto failed_to_write;
|
|
|
|
nilfs_segctor_fill_in_checksums(sci, nilfs->ns_crc_seed);
|
|
|
|
err = nilfs_segctor_write(sci, nilfs->ns_bdi);
|
|
if (unlikely(err))
|
|
goto failed_to_write;
|
|
|
|
nilfs_segctor_complete_write(sci);
|
|
|
|
/* Commit segments */
|
|
if (has_sr)
|
|
nilfs_segctor_clear_metadata_dirty(sci);
|
|
|
|
nilfs_segctor_end_construction(sci, nilfs, 0);
|
|
|
|
} while (sci->sc_stage.scnt != NILFS_ST_DONE);
|
|
|
|
out:
|
|
nilfs_segctor_destroy_segment_buffers(sci);
|
|
nilfs_segctor_check_out_files(sci, sbi);
|
|
return err;
|
|
|
|
failed_to_write:
|
|
nilfs_segctor_abort_write(sci, failed_page, err);
|
|
nilfs_segctor_cancel_segusage(sci, nilfs->ns_sufile);
|
|
|
|
failed_to_make_up:
|
|
if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
|
|
nilfs_redirty_inodes(&sci->sc_dirty_files);
|
|
|
|
failed:
|
|
if (nilfs_doing_gc())
|
|
nilfs_redirty_inodes(&sci->sc_gc_inodes);
|
|
nilfs_segctor_end_construction(sci, nilfs, err);
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* nilfs_secgtor_start_timer - set timer of background write
|
|
* @sci: nilfs_sc_info
|
|
*
|
|
* If the timer has already been set, it ignores the new request.
|
|
* This function MUST be called within a section locking the segment
|
|
* semaphore.
|
|
*/
|
|
static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci)
|
|
{
|
|
spin_lock(&sci->sc_state_lock);
|
|
if (sci->sc_timer && !(sci->sc_state & NILFS_SEGCTOR_COMMIT)) {
|
|
sci->sc_timer->expires = jiffies + sci->sc_interval;
|
|
add_timer(sci->sc_timer);
|
|
sci->sc_state |= NILFS_SEGCTOR_COMMIT;
|
|
}
|
|
spin_unlock(&sci->sc_state_lock);
|
|
}
|
|
|
|
static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn)
|
|
{
|
|
spin_lock(&sci->sc_state_lock);
|
|
if (!(sci->sc_flush_request & (1 << bn))) {
|
|
unsigned long prev_req = sci->sc_flush_request;
|
|
|
|
sci->sc_flush_request |= (1 << bn);
|
|
if (!prev_req)
|
|
wake_up(&sci->sc_wait_daemon);
|
|
}
|
|
spin_unlock(&sci->sc_state_lock);
|
|
}
|
|
|
|
/**
|
|
* nilfs_flush_segment - trigger a segment construction for resource control
|
|
* @sb: super block
|
|
* @ino: inode number of the file to be flushed out.
|
|
*/
|
|
void nilfs_flush_segment(struct super_block *sb, ino_t ino)
|
|
{
|
|
struct nilfs_sb_info *sbi = NILFS_SB(sb);
|
|
struct nilfs_sc_info *sci = NILFS_SC(sbi);
|
|
|
|
if (!sci || nilfs_doing_construction())
|
|
return;
|
|
nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0);
|
|
/* assign bit 0 to data files */
|
|
}
|
|
|
|
struct nilfs_segctor_wait_request {
|
|
wait_queue_t wq;
|
|
__u32 seq;
|
|
int err;
|
|
atomic_t done;
|
|
};
|
|
|
|
static int nilfs_segctor_sync(struct nilfs_sc_info *sci)
|
|
{
|
|
struct nilfs_segctor_wait_request wait_req;
|
|
int err = 0;
|
|
|
|
spin_lock(&sci->sc_state_lock);
|
|
init_wait(&wait_req.wq);
|
|
wait_req.err = 0;
|
|
atomic_set(&wait_req.done, 0);
|
|
wait_req.seq = ++sci->sc_seq_request;
|
|
spin_unlock(&sci->sc_state_lock);
|
|
|
|
init_waitqueue_entry(&wait_req.wq, current);
|
|
add_wait_queue(&sci->sc_wait_request, &wait_req.wq);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
wake_up(&sci->sc_wait_daemon);
|
|
|
|
for (;;) {
|
|
if (atomic_read(&wait_req.done)) {
|
|
err = wait_req.err;
|
|
break;
|
|
}
|
|
if (!signal_pending(current)) {
|
|
schedule();
|
|
continue;
|
|
}
|
|
err = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
finish_wait(&sci->sc_wait_request, &wait_req.wq);
|
|
return err;
|
|
}
|
|
|
|
static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err)
|
|
{
|
|
struct nilfs_segctor_wait_request *wrq, *n;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&sci->sc_wait_request.lock, flags);
|
|
list_for_each_entry_safe(wrq, n, &sci->sc_wait_request.task_list,
|
|
wq.task_list) {
|
|
if (!atomic_read(&wrq->done) &&
|
|
nilfs_cnt32_ge(sci->sc_seq_done, wrq->seq)) {
|
|
wrq->err = err;
|
|
atomic_set(&wrq->done, 1);
|
|
}
|
|
if (atomic_read(&wrq->done)) {
|
|
wrq->wq.func(&wrq->wq,
|
|
TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE,
|
|
0, NULL);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&sci->sc_wait_request.lock, flags);
|
|
}
|
|
|
|
/**
|
|
* nilfs_construct_segment - construct a logical segment
|
|
* @sb: super block
|
|
*
|
|
* Return Value: On success, 0 is retured. On errors, one of the following
|
|
* negative error code is returned.
|
|
*
|
|
* %-EROFS - Read only filesystem.
|
|
*
|
|
* %-EIO - I/O error
|
|
*
|
|
* %-ENOSPC - No space left on device (only in a panic state).
|
|
*
|
|
* %-ERESTARTSYS - Interrupted.
|
|
*
|
|
* %-ENOMEM - Insufficient memory available.
|
|
*/
|
|
int nilfs_construct_segment(struct super_block *sb)
|
|
{
|
|
struct nilfs_sb_info *sbi = NILFS_SB(sb);
|
|
struct nilfs_sc_info *sci = NILFS_SC(sbi);
|
|
struct nilfs_transaction_info *ti;
|
|
int err;
|
|
|
|
if (!sci)
|
|
return -EROFS;
|
|
|
|
/* A call inside transactions causes a deadlock. */
|
|
BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC);
|
|
|
|
err = nilfs_segctor_sync(sci);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* nilfs_construct_dsync_segment - construct a data-only logical segment
|
|
* @sb: super block
|
|
* @inode: inode whose data blocks should be written out
|
|
* @start: start byte offset
|
|
* @end: end byte offset (inclusive)
|
|
*
|
|
* Return Value: On success, 0 is retured. On errors, one of the following
|
|
* negative error code is returned.
|
|
*
|
|
* %-EROFS - Read only filesystem.
|
|
*
|
|
* %-EIO - I/O error
|
|
*
|
|
* %-ENOSPC - No space left on device (only in a panic state).
|
|
*
|
|
* %-ERESTARTSYS - Interrupted.
|
|
*
|
|
* %-ENOMEM - Insufficient memory available.
|
|
*/
|
|
int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode,
|
|
loff_t start, loff_t end)
|
|
{
|
|
struct nilfs_sb_info *sbi = NILFS_SB(sb);
|
|
struct nilfs_sc_info *sci = NILFS_SC(sbi);
|
|
struct nilfs_inode_info *ii;
|
|
struct nilfs_transaction_info ti;
|
|
int err = 0;
|
|
|
|
if (!sci)
|
|
return -EROFS;
|
|
|
|
nilfs_transaction_lock(sbi, &ti, 0);
|
|
|
|
ii = NILFS_I(inode);
|
|
if (test_bit(NILFS_I_INODE_DIRTY, &ii->i_state) ||
|
|
nilfs_test_opt(sbi, STRICT_ORDER) ||
|
|
test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
|
|
nilfs_discontinued(sbi->s_nilfs)) {
|
|
nilfs_transaction_unlock(sbi);
|
|
err = nilfs_segctor_sync(sci);
|
|
return err;
|
|
}
|
|
|
|
spin_lock(&sbi->s_inode_lock);
|
|
if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
|
|
!test_bit(NILFS_I_BUSY, &ii->i_state)) {
|
|
spin_unlock(&sbi->s_inode_lock);
|
|
nilfs_transaction_unlock(sbi);
|
|
return 0;
|
|
}
|
|
spin_unlock(&sbi->s_inode_lock);
|
|
sci->sc_dsync_inode = ii;
|
|
sci->sc_dsync_start = start;
|
|
sci->sc_dsync_end = end;
|
|
|
|
err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC);
|
|
|
|
nilfs_transaction_unlock(sbi);
|
|
return err;
|
|
}
|
|
|
|
struct nilfs_segctor_req {
|
|
int mode;
|
|
__u32 seq_accepted;
|
|
int sc_err; /* construction failure */
|
|
int sb_err; /* super block writeback failure */
|
|
};
|
|
|
|
#define FLUSH_FILE_BIT (0x1) /* data file only */
|
|
#define FLUSH_DAT_BIT (1 << NILFS_DAT_INO) /* DAT only */
|
|
|
|
static void nilfs_segctor_accept(struct nilfs_sc_info *sci,
|
|
struct nilfs_segctor_req *req)
|
|
{
|
|
req->sc_err = req->sb_err = 0;
|
|
spin_lock(&sci->sc_state_lock);
|
|
req->seq_accepted = sci->sc_seq_request;
|
|
spin_unlock(&sci->sc_state_lock);
|
|
|
|
if (sci->sc_timer)
|
|
del_timer_sync(sci->sc_timer);
|
|
}
|
|
|
|
static void nilfs_segctor_notify(struct nilfs_sc_info *sci,
|
|
struct nilfs_segctor_req *req)
|
|
{
|
|
/* Clear requests (even when the construction failed) */
|
|
spin_lock(&sci->sc_state_lock);
|
|
|
|
sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
|
|
|
|
if (req->mode == SC_LSEG_SR) {
|
|
sci->sc_seq_done = req->seq_accepted;
|
|
nilfs_segctor_wakeup(sci, req->sc_err ? : req->sb_err);
|
|
sci->sc_flush_request = 0;
|
|
} else if (req->mode == SC_FLUSH_FILE)
|
|
sci->sc_flush_request &= ~FLUSH_FILE_BIT;
|
|
else if (req->mode == SC_FLUSH_DAT)
|
|
sci->sc_flush_request &= ~FLUSH_DAT_BIT;
|
|
|
|
spin_unlock(&sci->sc_state_lock);
|
|
}
|
|
|
|
static int nilfs_segctor_construct(struct nilfs_sc_info *sci,
|
|
struct nilfs_segctor_req *req)
|
|
{
|
|
struct nilfs_sb_info *sbi = sci->sc_sbi;
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
int err = 0;
|
|
|
|
if (nilfs_discontinued(nilfs))
|
|
req->mode = SC_LSEG_SR;
|
|
if (!nilfs_segctor_confirm(sci)) {
|
|
err = nilfs_segctor_do_construct(sci, req->mode);
|
|
req->sc_err = err;
|
|
}
|
|
if (likely(!err)) {
|
|
if (req->mode != SC_FLUSH_DAT)
|
|
atomic_set(&nilfs->ns_ndirtyblks, 0);
|
|
if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) &&
|
|
nilfs_discontinued(nilfs)) {
|
|
down_write(&nilfs->ns_sem);
|
|
req->sb_err = nilfs_commit_super(sbi, 0);
|
|
up_write(&nilfs->ns_sem);
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void nilfs_construction_timeout(unsigned long data)
|
|
{
|
|
struct task_struct *p = (struct task_struct *)data;
|
|
wake_up_process(p);
|
|
}
|
|
|
|
static void
|
|
nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head)
|
|
{
|
|
struct nilfs_inode_info *ii, *n;
|
|
|
|
list_for_each_entry_safe(ii, n, head, i_dirty) {
|
|
if (!test_bit(NILFS_I_UPDATED, &ii->i_state))
|
|
continue;
|
|
hlist_del_init(&ii->vfs_inode.i_hash);
|
|
list_del_init(&ii->i_dirty);
|
|
nilfs_clear_gcinode(&ii->vfs_inode);
|
|
}
|
|
}
|
|
|
|
int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
|
|
void **kbufs)
|
|
{
|
|
struct nilfs_sb_info *sbi = NILFS_SB(sb);
|
|
struct nilfs_sc_info *sci = NILFS_SC(sbi);
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
struct nilfs_transaction_info ti;
|
|
struct nilfs_segctor_req req = { .mode = SC_LSEG_SR };
|
|
int err;
|
|
|
|
if (unlikely(!sci))
|
|
return -EROFS;
|
|
|
|
nilfs_transaction_lock(sbi, &ti, 1);
|
|
|
|
err = nilfs_init_gcdat_inode(nilfs);
|
|
if (unlikely(err))
|
|
goto out_unlock;
|
|
|
|
err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs);
|
|
if (unlikely(err))
|
|
goto out_unlock;
|
|
|
|
sci->sc_freesegs = kbufs[4];
|
|
sci->sc_nfreesegs = argv[4].v_nmembs;
|
|
list_splice_init(&nilfs->ns_gc_inodes, sci->sc_gc_inodes.prev);
|
|
|
|
for (;;) {
|
|
nilfs_segctor_accept(sci, &req);
|
|
err = nilfs_segctor_construct(sci, &req);
|
|
nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes);
|
|
nilfs_segctor_notify(sci, &req);
|
|
|
|
if (likely(!err))
|
|
break;
|
|
|
|
nilfs_warning(sb, __func__,
|
|
"segment construction failed. (err=%d)", err);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(sci->sc_interval);
|
|
}
|
|
|
|
out_unlock:
|
|
sci->sc_freesegs = NULL;
|
|
sci->sc_nfreesegs = 0;
|
|
nilfs_clear_gcdat_inode(nilfs);
|
|
nilfs_transaction_unlock(sbi);
|
|
return err;
|
|
}
|
|
|
|
static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode)
|
|
{
|
|
struct nilfs_sb_info *sbi = sci->sc_sbi;
|
|
struct nilfs_transaction_info ti;
|
|
struct nilfs_segctor_req req = { .mode = mode };
|
|
|
|
nilfs_transaction_lock(sbi, &ti, 0);
|
|
|
|
nilfs_segctor_accept(sci, &req);
|
|
nilfs_segctor_construct(sci, &req);
|
|
nilfs_segctor_notify(sci, &req);
|
|
|
|
/*
|
|
* Unclosed segment should be retried. We do this using sc_timer.
|
|
* Timeout of sc_timer will invoke complete construction which leads
|
|
* to close the current logical segment.
|
|
*/
|
|
if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags))
|
|
nilfs_segctor_start_timer(sci);
|
|
|
|
nilfs_transaction_unlock(sbi);
|
|
}
|
|
|
|
static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci)
|
|
{
|
|
int mode = 0;
|
|
int err;
|
|
|
|
spin_lock(&sci->sc_state_lock);
|
|
mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ?
|
|
SC_FLUSH_DAT : SC_FLUSH_FILE;
|
|
spin_unlock(&sci->sc_state_lock);
|
|
|
|
if (mode) {
|
|
err = nilfs_segctor_do_construct(sci, mode);
|
|
|
|
spin_lock(&sci->sc_state_lock);
|
|
sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ?
|
|
~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT;
|
|
spin_unlock(&sci->sc_state_lock);
|
|
}
|
|
clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
|
|
}
|
|
|
|
static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci)
|
|
{
|
|
if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
|
|
time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) {
|
|
if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT))
|
|
return SC_FLUSH_FILE;
|
|
else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT))
|
|
return SC_FLUSH_DAT;
|
|
}
|
|
return SC_LSEG_SR;
|
|
}
|
|
|
|
/**
|
|
* nilfs_segctor_thread - main loop of the segment constructor thread.
|
|
* @arg: pointer to a struct nilfs_sc_info.
|
|
*
|
|
* nilfs_segctor_thread() initializes a timer and serves as a daemon
|
|
* to execute segment constructions.
|
|
*/
|
|
static int nilfs_segctor_thread(void *arg)
|
|
{
|
|
struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg;
|
|
struct timer_list timer;
|
|
int timeout = 0;
|
|
|
|
init_timer(&timer);
|
|
timer.data = (unsigned long)current;
|
|
timer.function = nilfs_construction_timeout;
|
|
sci->sc_timer = &timer;
|
|
|
|
/* start sync. */
|
|
sci->sc_task = current;
|
|
wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */
|
|
printk(KERN_INFO
|
|
"segctord starting. Construction interval = %lu seconds, "
|
|
"CP frequency < %lu seconds\n",
|
|
sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ);
|
|
|
|
spin_lock(&sci->sc_state_lock);
|
|
loop:
|
|
for (;;) {
|
|
int mode;
|
|
|
|
if (sci->sc_state & NILFS_SEGCTOR_QUIT)
|
|
goto end_thread;
|
|
|
|
if (timeout || sci->sc_seq_request != sci->sc_seq_done)
|
|
mode = SC_LSEG_SR;
|
|
else if (!sci->sc_flush_request)
|
|
break;
|
|
else
|
|
mode = nilfs_segctor_flush_mode(sci);
|
|
|
|
spin_unlock(&sci->sc_state_lock);
|
|
nilfs_segctor_thread_construct(sci, mode);
|
|
spin_lock(&sci->sc_state_lock);
|
|
timeout = 0;
|
|
}
|
|
|
|
|
|
if (freezing(current)) {
|
|
spin_unlock(&sci->sc_state_lock);
|
|
refrigerator();
|
|
spin_lock(&sci->sc_state_lock);
|
|
} else {
|
|
DEFINE_WAIT(wait);
|
|
int should_sleep = 1;
|
|
|
|
prepare_to_wait(&sci->sc_wait_daemon, &wait,
|
|
TASK_INTERRUPTIBLE);
|
|
|
|
if (sci->sc_seq_request != sci->sc_seq_done)
|
|
should_sleep = 0;
|
|
else if (sci->sc_flush_request)
|
|
should_sleep = 0;
|
|
else if (sci->sc_state & NILFS_SEGCTOR_COMMIT)
|
|
should_sleep = time_before(jiffies,
|
|
sci->sc_timer->expires);
|
|
|
|
if (should_sleep) {
|
|
spin_unlock(&sci->sc_state_lock);
|
|
schedule();
|
|
spin_lock(&sci->sc_state_lock);
|
|
}
|
|
finish_wait(&sci->sc_wait_daemon, &wait);
|
|
timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
|
|
time_after_eq(jiffies, sci->sc_timer->expires));
|
|
}
|
|
goto loop;
|
|
|
|
end_thread:
|
|
spin_unlock(&sci->sc_state_lock);
|
|
del_timer_sync(sci->sc_timer);
|
|
sci->sc_timer = NULL;
|
|
|
|
/* end sync. */
|
|
sci->sc_task = NULL;
|
|
wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */
|
|
return 0;
|
|
}
|
|
|
|
static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci)
|
|
{
|
|
struct task_struct *t;
|
|
|
|
t = kthread_run(nilfs_segctor_thread, sci, "segctord");
|
|
if (IS_ERR(t)) {
|
|
int err = PTR_ERR(t);
|
|
|
|
printk(KERN_ERR "NILFS: error %d creating segctord thread\n",
|
|
err);
|
|
return err;
|
|
}
|
|
wait_event(sci->sc_wait_task, sci->sc_task != NULL);
|
|
return 0;
|
|
}
|
|
|
|
static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci)
|
|
{
|
|
sci->sc_state |= NILFS_SEGCTOR_QUIT;
|
|
|
|
while (sci->sc_task) {
|
|
wake_up(&sci->sc_wait_daemon);
|
|
spin_unlock(&sci->sc_state_lock);
|
|
wait_event(sci->sc_wait_task, sci->sc_task == NULL);
|
|
spin_lock(&sci->sc_state_lock);
|
|
}
|
|
}
|
|
|
|
static int nilfs_segctor_init(struct nilfs_sc_info *sci)
|
|
{
|
|
sci->sc_seq_done = sci->sc_seq_request;
|
|
|
|
return nilfs_segctor_start_thread(sci);
|
|
}
|
|
|
|
/*
|
|
* Setup & clean-up functions
|
|
*/
|
|
static struct nilfs_sc_info *nilfs_segctor_new(struct nilfs_sb_info *sbi)
|
|
{
|
|
struct nilfs_sc_info *sci;
|
|
|
|
sci = kzalloc(sizeof(*sci), GFP_KERNEL);
|
|
if (!sci)
|
|
return NULL;
|
|
|
|
sci->sc_sbi = sbi;
|
|
sci->sc_super = sbi->s_super;
|
|
|
|
init_waitqueue_head(&sci->sc_wait_request);
|
|
init_waitqueue_head(&sci->sc_wait_daemon);
|
|
init_waitqueue_head(&sci->sc_wait_task);
|
|
spin_lock_init(&sci->sc_state_lock);
|
|
INIT_LIST_HEAD(&sci->sc_dirty_files);
|
|
INIT_LIST_HEAD(&sci->sc_segbufs);
|
|
INIT_LIST_HEAD(&sci->sc_gc_inodes);
|
|
INIT_LIST_HEAD(&sci->sc_copied_buffers);
|
|
|
|
sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT;
|
|
sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ;
|
|
sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK;
|
|
|
|
if (sbi->s_interval)
|
|
sci->sc_interval = sbi->s_interval;
|
|
if (sbi->s_watermark)
|
|
sci->sc_watermark = sbi->s_watermark;
|
|
return sci;
|
|
}
|
|
|
|
static void nilfs_segctor_write_out(struct nilfs_sc_info *sci)
|
|
{
|
|
int ret, retrycount = NILFS_SC_CLEANUP_RETRY;
|
|
|
|
/* The segctord thread was stopped and its timer was removed.
|
|
But some tasks remain. */
|
|
do {
|
|
struct nilfs_sb_info *sbi = sci->sc_sbi;
|
|
struct nilfs_transaction_info ti;
|
|
struct nilfs_segctor_req req = { .mode = SC_LSEG_SR };
|
|
|
|
nilfs_transaction_lock(sbi, &ti, 0);
|
|
nilfs_segctor_accept(sci, &req);
|
|
ret = nilfs_segctor_construct(sci, &req);
|
|
nilfs_segctor_notify(sci, &req);
|
|
nilfs_transaction_unlock(sbi);
|
|
|
|
} while (ret && retrycount-- > 0);
|
|
}
|
|
|
|
/**
|
|
* nilfs_segctor_destroy - destroy the segment constructor.
|
|
* @sci: nilfs_sc_info
|
|
*
|
|
* nilfs_segctor_destroy() kills the segctord thread and frees
|
|
* the nilfs_sc_info struct.
|
|
* Caller must hold the segment semaphore.
|
|
*/
|
|
static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
|
|
{
|
|
struct nilfs_sb_info *sbi = sci->sc_sbi;
|
|
int flag;
|
|
|
|
up_write(&sbi->s_nilfs->ns_segctor_sem);
|
|
|
|
spin_lock(&sci->sc_state_lock);
|
|
nilfs_segctor_kill_thread(sci);
|
|
flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request
|
|
|| sci->sc_seq_request != sci->sc_seq_done);
|
|
spin_unlock(&sci->sc_state_lock);
|
|
|
|
if (flag || nilfs_segctor_confirm(sci))
|
|
nilfs_segctor_write_out(sci);
|
|
|
|
WARN_ON(!list_empty(&sci->sc_copied_buffers));
|
|
|
|
if (!list_empty(&sci->sc_dirty_files)) {
|
|
nilfs_warning(sbi->s_super, __func__,
|
|
"dirty file(s) after the final construction\n");
|
|
nilfs_dispose_list(sbi, &sci->sc_dirty_files, 1);
|
|
}
|
|
|
|
WARN_ON(!list_empty(&sci->sc_segbufs));
|
|
|
|
down_write(&sbi->s_nilfs->ns_segctor_sem);
|
|
|
|
kfree(sci);
|
|
}
|
|
|
|
/**
|
|
* nilfs_attach_segment_constructor - attach a segment constructor
|
|
* @sbi: nilfs_sb_info
|
|
*
|
|
* nilfs_attach_segment_constructor() allocates a struct nilfs_sc_info,
|
|
* initilizes it, and starts the segment constructor.
|
|
*
|
|
* Return Value: On success, 0 is returned. On error, one of the following
|
|
* negative error code is returned.
|
|
*
|
|
* %-ENOMEM - Insufficient memory available.
|
|
*/
|
|
int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi)
|
|
{
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
int err;
|
|
|
|
/* Each field of nilfs_segctor is cleared through the initialization
|
|
of super-block info */
|
|
sbi->s_sc_info = nilfs_segctor_new(sbi);
|
|
if (!sbi->s_sc_info)
|
|
return -ENOMEM;
|
|
|
|
nilfs_attach_writer(nilfs, sbi);
|
|
err = nilfs_segctor_init(NILFS_SC(sbi));
|
|
if (err) {
|
|
nilfs_detach_writer(nilfs, sbi);
|
|
kfree(sbi->s_sc_info);
|
|
sbi->s_sc_info = NULL;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* nilfs_detach_segment_constructor - destroy the segment constructor
|
|
* @sbi: nilfs_sb_info
|
|
*
|
|
* nilfs_detach_segment_constructor() kills the segment constructor daemon,
|
|
* frees the struct nilfs_sc_info, and destroy the dirty file list.
|
|
*/
|
|
void nilfs_detach_segment_constructor(struct nilfs_sb_info *sbi)
|
|
{
|
|
struct the_nilfs *nilfs = sbi->s_nilfs;
|
|
LIST_HEAD(garbage_list);
|
|
|
|
down_write(&nilfs->ns_segctor_sem);
|
|
if (NILFS_SC(sbi)) {
|
|
nilfs_segctor_destroy(NILFS_SC(sbi));
|
|
sbi->s_sc_info = NULL;
|
|
}
|
|
|
|
/* Force to free the list of dirty files */
|
|
spin_lock(&sbi->s_inode_lock);
|
|
if (!list_empty(&sbi->s_dirty_files)) {
|
|
list_splice_init(&sbi->s_dirty_files, &garbage_list);
|
|
nilfs_warning(sbi->s_super, __func__,
|
|
"Non empty dirty list after the last "
|
|
"segment construction\n");
|
|
}
|
|
spin_unlock(&sbi->s_inode_lock);
|
|
up_write(&nilfs->ns_segctor_sem);
|
|
|
|
nilfs_dispose_list(sbi, &garbage_list, 1);
|
|
nilfs_detach_writer(nilfs, sbi);
|
|
}
|