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818 lines
18 KiB
818 lines
18 KiB
// 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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|
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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 "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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|
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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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|
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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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|
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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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|
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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(GFP_NOFS, 1); |
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bio_set_dev(bio, inode->i_sb->s_bdev); |
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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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bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
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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_readpage(struct file *fp, struct page *page) |
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{ |
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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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|
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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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|
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bio = bio_alloc(GFP_NOFS, 1); |
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bio_set_dev(bio, inode->i_sb->s_bdev); |
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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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bio_set_op_attrs(bio, REQ_OP_READ, 0); |
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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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|
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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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|
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static int metapage_releasepage(struct page *page, gfp_t gfp_mask) |
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{ |
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struct metapage *mp; |
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int ret = 1; |
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int offset; |
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|
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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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|
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if (!mp) |
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continue; |
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|
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jfs_info("metapage_releasepage: mp = 0x%p", mp); |
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if (mp->count || mp->nohomeok || |
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test_bit(META_dirty, &mp->flag)) { |
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jfs_info("count = %ld, nohomeok = %d", mp->count, |
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mp->nohomeok); |
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ret = 0; |
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continue; |
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} |
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if (mp->lsn) |
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remove_from_logsync(mp); |
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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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return ret; |
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} |
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|
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static void metapage_invalidatepage(struct page *page, unsigned int offset, |
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unsigned int length) |
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{ |
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BUG_ON(offset || length < PAGE_SIZE); |
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|
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BUG_ON(PageWriteback(page)); |
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|
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metapage_releasepage(page, 0); |
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} |
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|
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const struct address_space_operations jfs_metapage_aops = { |
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.readpage = metapage_readpage, |
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.writepage = metapage_writepage, |
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.releasepage = metapage_releasepage, |
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.invalidatepage = metapage_invalidatepage, |
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.set_page_dirty = __set_page_dirty_nobuffers, |
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}; |
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|
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struct metapage *__get_metapage(struct inode *inode, unsigned long lblock, |
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unsigned int size, int absolute, |
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unsigned long new) |
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{ |
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int l2BlocksPerPage; |
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int l2bsize; |
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struct address_space *mapping; |
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struct metapage *mp = NULL; |
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struct page *page; |
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unsigned long page_index; |
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unsigned long page_offset; |
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|
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jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d", |
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inode->i_ino, lblock, absolute); |
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|
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l2bsize = inode->i_blkbits; |
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l2BlocksPerPage = PAGE_SHIFT - l2bsize; |
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page_index = lblock >> l2BlocksPerPage; |
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page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize; |
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if ((page_offset + size) > PAGE_SIZE) { |
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jfs_err("MetaData crosses page boundary!!"); |
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jfs_err("lblock = %lx, size = %d", lblock, size); |
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dump_stack(); |
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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) || !PageUptodate(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
|
|
|