818 lines
18 KiB
C
818 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) International Business Machines Corp., 2000-2005
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* Portions Copyright (C) Christoph Hellwig, 2001-2002
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*/
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/bio.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/buffer_head.h>
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#include <linux/mempool.h>
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#include <linux/seq_file.h>
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#include <linux/writeback.h>
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#include "jfs_incore.h"
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#include "jfs_superblock.h"
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#include "jfs_filsys.h"
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#include "jfs_metapage.h"
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#include "jfs_txnmgr.h"
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#include "jfs_debug.h"
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#ifdef CONFIG_JFS_STATISTICS
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static struct {
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uint pagealloc; /* # of page allocations */
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uint pagefree; /* # of page frees */
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uint lockwait; /* # of sleeping lock_metapage() calls */
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} mpStat;
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#endif
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#define metapage_locked(mp) test_bit(META_locked, &(mp)->flag)
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#define trylock_metapage(mp) test_and_set_bit_lock(META_locked, &(mp)->flag)
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static inline void unlock_metapage(struct metapage *mp)
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{
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clear_bit_unlock(META_locked, &mp->flag);
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wake_up(&mp->wait);
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}
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static inline void __lock_metapage(struct metapage *mp)
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{
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DECLARE_WAITQUEUE(wait, current);
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INCREMENT(mpStat.lockwait);
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add_wait_queue_exclusive(&mp->wait, &wait);
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do {
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set_current_state(TASK_UNINTERRUPTIBLE);
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if (metapage_locked(mp)) {
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unlock_page(mp->page);
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io_schedule();
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lock_page(mp->page);
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}
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} while (trylock_metapage(mp));
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(&mp->wait, &wait);
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}
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/*
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* Must have mp->page locked
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*/
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static inline void lock_metapage(struct metapage *mp)
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{
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if (trylock_metapage(mp))
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__lock_metapage(mp);
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}
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#define METAPOOL_MIN_PAGES 32
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static struct kmem_cache *metapage_cache;
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static mempool_t *metapage_mempool;
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#define MPS_PER_PAGE (PAGE_SIZE >> L2PSIZE)
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#if MPS_PER_PAGE > 1
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struct meta_anchor {
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int mp_count;
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atomic_t io_count;
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struct metapage *mp[MPS_PER_PAGE];
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};
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#define mp_anchor(page) ((struct meta_anchor *)page_private(page))
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static inline struct metapage *page_to_mp(struct page *page, int offset)
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{
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if (!PagePrivate(page))
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return NULL;
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return mp_anchor(page)->mp[offset >> L2PSIZE];
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}
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static inline int insert_metapage(struct page *page, struct metapage *mp)
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{
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struct meta_anchor *a;
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int index;
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int l2mp_blocks; /* log2 blocks per metapage */
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if (PagePrivate(page))
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a = mp_anchor(page);
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else {
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a = kzalloc(sizeof(struct meta_anchor), GFP_NOFS);
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if (!a)
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return -ENOMEM;
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set_page_private(page, (unsigned long)a);
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SetPagePrivate(page);
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kmap(page);
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}
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if (mp) {
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l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits;
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index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1);
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a->mp_count++;
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a->mp[index] = mp;
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}
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return 0;
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}
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static inline void remove_metapage(struct page *page, struct metapage *mp)
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{
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struct meta_anchor *a = mp_anchor(page);
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int l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits;
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int index;
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index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1);
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BUG_ON(a->mp[index] != mp);
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a->mp[index] = NULL;
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if (--a->mp_count == 0) {
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kfree(a);
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set_page_private(page, 0);
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ClearPagePrivate(page);
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kunmap(page);
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}
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}
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static inline void inc_io(struct page *page)
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{
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atomic_inc(&mp_anchor(page)->io_count);
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}
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static inline void dec_io(struct page *page, void (*handler) (struct page *))
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{
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if (atomic_dec_and_test(&mp_anchor(page)->io_count))
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handler(page);
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}
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#else
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static inline struct metapage *page_to_mp(struct page *page, int offset)
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{
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return PagePrivate(page) ? (struct metapage *)page_private(page) : NULL;
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}
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static inline int insert_metapage(struct page *page, struct metapage *mp)
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{
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if (mp) {
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set_page_private(page, (unsigned long)mp);
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SetPagePrivate(page);
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kmap(page);
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}
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return 0;
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}
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static inline void remove_metapage(struct page *page, struct metapage *mp)
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{
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set_page_private(page, 0);
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ClearPagePrivate(page);
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kunmap(page);
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}
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#define inc_io(page) do {} while(0)
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#define dec_io(page, handler) handler(page)
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#endif
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static inline struct metapage *alloc_metapage(gfp_t gfp_mask)
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{
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struct metapage *mp = mempool_alloc(metapage_mempool, gfp_mask);
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if (mp) {
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mp->lid = 0;
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mp->lsn = 0;
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mp->data = NULL;
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mp->clsn = 0;
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mp->log = NULL;
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init_waitqueue_head(&mp->wait);
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}
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return mp;
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}
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static inline void free_metapage(struct metapage *mp)
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{
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mempool_free(mp, metapage_mempool);
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}
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int __init metapage_init(void)
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{
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/*
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* Allocate the metapage structures
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*/
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metapage_cache = kmem_cache_create("jfs_mp", sizeof(struct metapage),
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0, 0, NULL);
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if (metapage_cache == NULL)
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return -ENOMEM;
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metapage_mempool = mempool_create_slab_pool(METAPOOL_MIN_PAGES,
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metapage_cache);
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if (metapage_mempool == NULL) {
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kmem_cache_destroy(metapage_cache);
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return -ENOMEM;
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}
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return 0;
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}
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void metapage_exit(void)
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{
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mempool_destroy(metapage_mempool);
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kmem_cache_destroy(metapage_cache);
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}
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static inline void drop_metapage(struct page *page, struct metapage *mp)
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{
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if (mp->count || mp->nohomeok || test_bit(META_dirty, &mp->flag) ||
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test_bit(META_io, &mp->flag))
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return;
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remove_metapage(page, mp);
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INCREMENT(mpStat.pagefree);
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free_metapage(mp);
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}
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/*
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* Metapage address space operations
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*/
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static sector_t metapage_get_blocks(struct inode *inode, sector_t lblock,
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int *len)
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{
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int rc = 0;
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int xflag;
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s64 xaddr;
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sector_t file_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
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inode->i_blkbits;
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if (lblock >= file_blocks)
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return 0;
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if (lblock + *len > file_blocks)
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*len = file_blocks - lblock;
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if (inode->i_ino) {
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rc = xtLookup(inode, (s64)lblock, *len, &xflag, &xaddr, len, 0);
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if ((rc == 0) && *len)
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lblock = (sector_t)xaddr;
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else
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lblock = 0;
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} /* else no mapping */
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return lblock;
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}
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static void last_read_complete(struct page *page)
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{
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if (!PageError(page))
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SetPageUptodate(page);
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unlock_page(page);
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}
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static void metapage_read_end_io(struct bio *bio)
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{
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struct page *page = bio->bi_private;
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if (bio->bi_status) {
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printk(KERN_ERR "metapage_read_end_io: I/O error\n");
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SetPageError(page);
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}
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dec_io(page, last_read_complete);
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bio_put(bio);
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}
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static void remove_from_logsync(struct metapage *mp)
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{
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struct jfs_log *log = mp->log;
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unsigned long flags;
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/*
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* This can race. Recheck that log hasn't been set to null, and after
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* acquiring logsync lock, recheck lsn
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*/
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if (!log)
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return;
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LOGSYNC_LOCK(log, flags);
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if (mp->lsn) {
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mp->log = NULL;
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mp->lsn = 0;
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mp->clsn = 0;
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log->count--;
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list_del(&mp->synclist);
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}
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LOGSYNC_UNLOCK(log, flags);
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}
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static void last_write_complete(struct page *page)
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{
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struct metapage *mp;
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unsigned int offset;
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for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) {
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mp = page_to_mp(page, offset);
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if (mp && test_bit(META_io, &mp->flag)) {
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if (mp->lsn)
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remove_from_logsync(mp);
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clear_bit(META_io, &mp->flag);
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}
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/*
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* I'd like to call drop_metapage here, but I don't think it's
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* safe unless I have the page locked
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*/
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}
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end_page_writeback(page);
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}
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static void metapage_write_end_io(struct bio *bio)
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{
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struct page *page = bio->bi_private;
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BUG_ON(!PagePrivate(page));
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if (bio->bi_status) {
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printk(KERN_ERR "metapage_write_end_io: I/O error\n");
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SetPageError(page);
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}
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dec_io(page, last_write_complete);
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bio_put(bio);
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}
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static int metapage_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct bio *bio = NULL;
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int block_offset; /* block offset of mp within page */
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struct inode *inode = page->mapping->host;
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int blocks_per_mp = JFS_SBI(inode->i_sb)->nbperpage;
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int len;
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int xlen;
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struct metapage *mp;
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int redirty = 0;
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sector_t lblock;
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int nr_underway = 0;
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sector_t pblock;
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sector_t next_block = 0;
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sector_t page_start;
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unsigned long bio_bytes = 0;
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unsigned long bio_offset = 0;
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int offset;
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int bad_blocks = 0;
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page_start = (sector_t)page->index <<
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(PAGE_SHIFT - inode->i_blkbits);
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BUG_ON(!PageLocked(page));
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BUG_ON(PageWriteback(page));
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set_page_writeback(page);
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for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) {
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mp = page_to_mp(page, offset);
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if (!mp || !test_bit(META_dirty, &mp->flag))
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continue;
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if (mp->nohomeok && !test_bit(META_forcewrite, &mp->flag)) {
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redirty = 1;
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/*
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* Make sure this page isn't blocked indefinitely.
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* If the journal isn't undergoing I/O, push it
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*/
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if (mp->log && !(mp->log->cflag & logGC_PAGEOUT))
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jfs_flush_journal(mp->log, 0);
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continue;
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}
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clear_bit(META_dirty, &mp->flag);
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set_bit(META_io, &mp->flag);
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block_offset = offset >> inode->i_blkbits;
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lblock = page_start + block_offset;
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if (bio) {
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if (xlen && lblock == next_block) {
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/* Contiguous, in memory & on disk */
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len = min(xlen, blocks_per_mp);
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xlen -= len;
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bio_bytes += len << inode->i_blkbits;
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continue;
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}
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/* Not contiguous */
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if (bio_add_page(bio, page, bio_bytes, bio_offset) <
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bio_bytes)
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goto add_failed;
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/*
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* Increment counter before submitting i/o to keep
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* count from hitting zero before we're through
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*/
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inc_io(page);
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if (!bio->bi_iter.bi_size)
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goto dump_bio;
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submit_bio(bio);
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nr_underway++;
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bio = NULL;
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} else
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inc_io(page);
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xlen = (PAGE_SIZE - offset) >> inode->i_blkbits;
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pblock = metapage_get_blocks(inode, lblock, &xlen);
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if (!pblock) {
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printk(KERN_ERR "JFS: metapage_get_blocks failed\n");
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/*
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* We already called inc_io(), but can't cancel it
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* with dec_io() until we're done with the page
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*/
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bad_blocks++;
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continue;
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}
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len = min(xlen, (int)JFS_SBI(inode->i_sb)->nbperpage);
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bio = bio_alloc(inode->i_sb->s_bdev, 1, REQ_OP_WRITE, GFP_NOFS);
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bio->bi_iter.bi_sector = pblock << (inode->i_blkbits - 9);
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bio->bi_end_io = metapage_write_end_io;
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bio->bi_private = page;
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/* Don't call bio_add_page yet, we may add to this vec */
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bio_offset = offset;
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bio_bytes = len << inode->i_blkbits;
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xlen -= len;
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next_block = lblock + len;
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}
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if (bio) {
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if (bio_add_page(bio, page, bio_bytes, bio_offset) < bio_bytes)
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goto add_failed;
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if (!bio->bi_iter.bi_size)
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goto dump_bio;
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submit_bio(bio);
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nr_underway++;
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}
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if (redirty)
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redirty_page_for_writepage(wbc, page);
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unlock_page(page);
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if (bad_blocks)
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goto err_out;
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if (nr_underway == 0)
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end_page_writeback(page);
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return 0;
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add_failed:
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/* We should never reach here, since we're only adding one vec */
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printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n");
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goto skip;
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dump_bio:
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print_hex_dump(KERN_ERR, "JFS: dump of bio: ", DUMP_PREFIX_ADDRESS, 16,
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4, bio, sizeof(*bio), 0);
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skip:
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bio_put(bio);
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unlock_page(page);
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dec_io(page, last_write_complete);
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err_out:
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while (bad_blocks--)
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dec_io(page, last_write_complete);
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return -EIO;
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}
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static int metapage_read_folio(struct file *fp, struct folio *folio)
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{
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struct page *page = &folio->page;
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struct inode *inode = page->mapping->host;
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struct bio *bio = NULL;
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int block_offset;
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int blocks_per_page = i_blocks_per_page(inode, page);
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sector_t page_start; /* address of page in fs blocks */
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sector_t pblock;
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int xlen;
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unsigned int len;
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int offset;
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BUG_ON(!PageLocked(page));
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page_start = (sector_t)page->index <<
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(PAGE_SHIFT - inode->i_blkbits);
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block_offset = 0;
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while (block_offset < blocks_per_page) {
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xlen = blocks_per_page - block_offset;
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pblock = metapage_get_blocks(inode, page_start + block_offset,
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&xlen);
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if (pblock) {
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if (!PagePrivate(page))
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insert_metapage(page, NULL);
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inc_io(page);
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if (bio)
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submit_bio(bio);
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bio = bio_alloc(inode->i_sb->s_bdev, 1, REQ_OP_READ,
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GFP_NOFS);
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bio->bi_iter.bi_sector =
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pblock << (inode->i_blkbits - 9);
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bio->bi_end_io = metapage_read_end_io;
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bio->bi_private = page;
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len = xlen << inode->i_blkbits;
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offset = block_offset << inode->i_blkbits;
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if (bio_add_page(bio, page, len, offset) < len)
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goto add_failed;
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block_offset += xlen;
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} else
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block_offset++;
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}
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if (bio)
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submit_bio(bio);
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else
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unlock_page(page);
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return 0;
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add_failed:
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printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n");
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bio_put(bio);
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dec_io(page, last_read_complete);
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return -EIO;
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}
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static bool metapage_release_folio(struct folio *folio, gfp_t gfp_mask)
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{
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struct metapage *mp;
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bool ret = true;
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int offset;
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for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) {
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mp = page_to_mp(&folio->page, offset);
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if (!mp)
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continue;
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|
|
jfs_info("metapage_release_folio: mp = 0x%p", mp);
|
|
if (mp->count || mp->nohomeok ||
|
|
test_bit(META_dirty, &mp->flag)) {
|
|
jfs_info("count = %ld, nohomeok = %d", mp->count,
|
|
mp->nohomeok);
|
|
ret = false;
|
|
continue;
|
|
}
|
|
if (mp->lsn)
|
|
remove_from_logsync(mp);
|
|
remove_metapage(&folio->page, mp);
|
|
INCREMENT(mpStat.pagefree);
|
|
free_metapage(mp);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void metapage_invalidate_folio(struct folio *folio, size_t offset,
|
|
size_t length)
|
|
{
|
|
BUG_ON(offset || length < folio_size(folio));
|
|
|
|
BUG_ON(folio_test_writeback(folio));
|
|
|
|
metapage_release_folio(folio, 0);
|
|
}
|
|
|
|
const struct address_space_operations jfs_metapage_aops = {
|
|
.read_folio = metapage_read_folio,
|
|
.writepage = metapage_writepage,
|
|
.release_folio = metapage_release_folio,
|
|
.invalidate_folio = metapage_invalidate_folio,
|
|
.dirty_folio = filemap_dirty_folio,
|
|
};
|
|
|
|
struct metapage *__get_metapage(struct inode *inode, unsigned long lblock,
|
|
unsigned int size, int absolute,
|
|
unsigned long new)
|
|
{
|
|
int l2BlocksPerPage;
|
|
int l2bsize;
|
|
struct address_space *mapping;
|
|
struct metapage *mp = NULL;
|
|
struct page *page;
|
|
unsigned long page_index;
|
|
unsigned long page_offset;
|
|
|
|
jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d",
|
|
inode->i_ino, lblock, absolute);
|
|
|
|
l2bsize = inode->i_blkbits;
|
|
l2BlocksPerPage = PAGE_SHIFT - l2bsize;
|
|
page_index = lblock >> l2BlocksPerPage;
|
|
page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize;
|
|
if ((page_offset + size) > PAGE_SIZE) {
|
|
jfs_err("MetaData crosses page boundary!!");
|
|
jfs_err("lblock = %lx, size = %d", lblock, size);
|
|
dump_stack();
|
|
return NULL;
|
|
}
|
|
if (absolute)
|
|
mapping = JFS_SBI(inode->i_sb)->direct_inode->i_mapping;
|
|
else {
|
|
/*
|
|
* If an nfs client tries to read an inode that is larger
|
|
* than any existing inodes, we may try to read past the
|
|
* end of the inode map
|
|
*/
|
|
if ((lblock << inode->i_blkbits) >= inode->i_size)
|
|
return NULL;
|
|
mapping = inode->i_mapping;
|
|
}
|
|
|
|
if (new && (PSIZE == PAGE_SIZE)) {
|
|
page = grab_cache_page(mapping, page_index);
|
|
if (!page) {
|
|
jfs_err("grab_cache_page failed!");
|
|
return NULL;
|
|
}
|
|
SetPageUptodate(page);
|
|
} else {
|
|
page = read_mapping_page(mapping, page_index, NULL);
|
|
if (IS_ERR(page)) {
|
|
jfs_err("read_mapping_page failed!");
|
|
return NULL;
|
|
}
|
|
lock_page(page);
|
|
}
|
|
|
|
mp = page_to_mp(page, page_offset);
|
|
if (mp) {
|
|
if (mp->logical_size != size) {
|
|
jfs_error(inode->i_sb,
|
|
"get_mp->logical_size != size\n");
|
|
jfs_err("logical_size = %d, size = %d",
|
|
mp->logical_size, size);
|
|
dump_stack();
|
|
goto unlock;
|
|
}
|
|
mp->count++;
|
|
lock_metapage(mp);
|
|
if (test_bit(META_discard, &mp->flag)) {
|
|
if (!new) {
|
|
jfs_error(inode->i_sb,
|
|
"using a discarded metapage\n");
|
|
discard_metapage(mp);
|
|
goto unlock;
|
|
}
|
|
clear_bit(META_discard, &mp->flag);
|
|
}
|
|
} else {
|
|
INCREMENT(mpStat.pagealloc);
|
|
mp = alloc_metapage(GFP_NOFS);
|
|
if (!mp)
|
|
goto unlock;
|
|
mp->page = page;
|
|
mp->sb = inode->i_sb;
|
|
mp->flag = 0;
|
|
mp->xflag = COMMIT_PAGE;
|
|
mp->count = 1;
|
|
mp->nohomeok = 0;
|
|
mp->logical_size = size;
|
|
mp->data = page_address(page) + page_offset;
|
|
mp->index = lblock;
|
|
if (unlikely(insert_metapage(page, mp))) {
|
|
free_metapage(mp);
|
|
goto unlock;
|
|
}
|
|
lock_metapage(mp);
|
|
}
|
|
|
|
if (new) {
|
|
jfs_info("zeroing mp = 0x%p", mp);
|
|
memset(mp->data, 0, PSIZE);
|
|
}
|
|
|
|
unlock_page(page);
|
|
jfs_info("__get_metapage: returning = 0x%p data = 0x%p", mp, mp->data);
|
|
return mp;
|
|
|
|
unlock:
|
|
unlock_page(page);
|
|
return NULL;
|
|
}
|
|
|
|
void grab_metapage(struct metapage * mp)
|
|
{
|
|
jfs_info("grab_metapage: mp = 0x%p", mp);
|
|
get_page(mp->page);
|
|
lock_page(mp->page);
|
|
mp->count++;
|
|
lock_metapage(mp);
|
|
unlock_page(mp->page);
|
|
}
|
|
|
|
void force_metapage(struct metapage *mp)
|
|
{
|
|
struct page *page = mp->page;
|
|
jfs_info("force_metapage: mp = 0x%p", mp);
|
|
set_bit(META_forcewrite, &mp->flag);
|
|
clear_bit(META_sync, &mp->flag);
|
|
get_page(page);
|
|
lock_page(page);
|
|
set_page_dirty(page);
|
|
if (write_one_page(page))
|
|
jfs_error(mp->sb, "write_one_page() failed\n");
|
|
clear_bit(META_forcewrite, &mp->flag);
|
|
put_page(page);
|
|
}
|
|
|
|
void hold_metapage(struct metapage *mp)
|
|
{
|
|
lock_page(mp->page);
|
|
}
|
|
|
|
void put_metapage(struct metapage *mp)
|
|
{
|
|
if (mp->count || mp->nohomeok) {
|
|
/* Someone else will release this */
|
|
unlock_page(mp->page);
|
|
return;
|
|
}
|
|
get_page(mp->page);
|
|
mp->count++;
|
|
lock_metapage(mp);
|
|
unlock_page(mp->page);
|
|
release_metapage(mp);
|
|
}
|
|
|
|
void release_metapage(struct metapage * mp)
|
|
{
|
|
struct page *page = mp->page;
|
|
jfs_info("release_metapage: mp = 0x%p, flag = 0x%lx", mp, mp->flag);
|
|
|
|
BUG_ON(!page);
|
|
|
|
lock_page(page);
|
|
unlock_metapage(mp);
|
|
|
|
assert(mp->count);
|
|
if (--mp->count || mp->nohomeok) {
|
|
unlock_page(page);
|
|
put_page(page);
|
|
return;
|
|
}
|
|
|
|
if (test_bit(META_dirty, &mp->flag)) {
|
|
set_page_dirty(page);
|
|
if (test_bit(META_sync, &mp->flag)) {
|
|
clear_bit(META_sync, &mp->flag);
|
|
if (write_one_page(page))
|
|
jfs_error(mp->sb, "write_one_page() failed\n");
|
|
lock_page(page); /* write_one_page unlocks the page */
|
|
}
|
|
} else if (mp->lsn) /* discard_metapage doesn't remove it */
|
|
remove_from_logsync(mp);
|
|
|
|
/* Try to keep metapages from using up too much memory */
|
|
drop_metapage(page, mp);
|
|
|
|
unlock_page(page);
|
|
put_page(page);
|
|
}
|
|
|
|
void __invalidate_metapages(struct inode *ip, s64 addr, int len)
|
|
{
|
|
sector_t lblock;
|
|
int l2BlocksPerPage = PAGE_SHIFT - ip->i_blkbits;
|
|
int BlocksPerPage = 1 << l2BlocksPerPage;
|
|
/* All callers are interested in block device's mapping */
|
|
struct address_space *mapping =
|
|
JFS_SBI(ip->i_sb)->direct_inode->i_mapping;
|
|
struct metapage *mp;
|
|
struct page *page;
|
|
unsigned int offset;
|
|
|
|
/*
|
|
* Mark metapages to discard. They will eventually be
|
|
* released, but should not be written.
|
|
*/
|
|
for (lblock = addr & ~(BlocksPerPage - 1); lblock < addr + len;
|
|
lblock += BlocksPerPage) {
|
|
page = find_lock_page(mapping, lblock >> l2BlocksPerPage);
|
|
if (!page)
|
|
continue;
|
|
for (offset = 0; offset < PAGE_SIZE; offset += PSIZE) {
|
|
mp = page_to_mp(page, offset);
|
|
if (!mp)
|
|
continue;
|
|
if (mp->index < addr)
|
|
continue;
|
|
if (mp->index >= addr + len)
|
|
break;
|
|
|
|
clear_bit(META_dirty, &mp->flag);
|
|
set_bit(META_discard, &mp->flag);
|
|
if (mp->lsn)
|
|
remove_from_logsync(mp);
|
|
}
|
|
unlock_page(page);
|
|
put_page(page);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_JFS_STATISTICS
|
|
int jfs_mpstat_proc_show(struct seq_file *m, void *v)
|
|
{
|
|
seq_printf(m,
|
|
"JFS Metapage statistics\n"
|
|
"=======================\n"
|
|
"page allocations = %d\n"
|
|
"page frees = %d\n"
|
|
"lock waits = %d\n",
|
|
mpStat.pagealloc,
|
|
mpStat.pagefree,
|
|
mpStat.lockwait);
|
|
return 0;
|
|
}
|
|
#endif
|