diff options
Diffstat (limited to 'fs/jfs/jfs_metapage.c')
| -rw-r--r-- | fs/jfs/jfs_metapage.c | 908 |
1 files changed, 601 insertions, 307 deletions
diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c index 4c0a3ac75c08..41bf078dce05 100644 --- a/fs/jfs/jfs_metapage.c +++ b/fs/jfs/jfs_metapage.c @@ -1,5 +1,5 @@ /* - * Copyright (C) International Business Machines Corp., 2000-2003 + * Copyright (C) International Business Machines Corp., 2000-2005 * Portions Copyright (C) Christoph Hellwig, 2001-2002 * * This program is free software; you can redistribute it and/or modify @@ -18,10 +18,11 @@ */ #include <linux/fs.h> +#include <linux/mm.h> +#include <linux/bio.h> #include <linux/init.h> #include <linux/buffer_head.h> #include <linux/mempool.h> -#include <linux/delay.h> #include "jfs_incore.h" #include "jfs_superblock.h" #include "jfs_filsys.h" @@ -29,8 +30,6 @@ #include "jfs_txnmgr.h" #include "jfs_debug.h" -static DEFINE_SPINLOCK(meta_lock); - #ifdef CONFIG_JFS_STATISTICS static struct { uint pagealloc; /* # of page allocations */ @@ -39,22 +38,8 @@ static struct { } mpStat; #endif - -#define HASH_BITS 10 /* This makes hash_table 1 4K page */ -#define HASH_SIZE (1 << HASH_BITS) -static struct metapage **hash_table = NULL; -static unsigned long hash_order; - - -static inline int metapage_locked(struct metapage *mp) -{ - return test_bit(META_locked, &mp->flag); -} - -static inline int trylock_metapage(struct metapage *mp) -{ - return test_and_set_bit(META_locked, &mp->flag); -} +#define metapage_locked(mp) test_bit(META_locked, &(mp)->flag) +#define trylock_metapage(mp) test_and_set_bit(META_locked, &(mp)->flag) static inline void unlock_metapage(struct metapage *mp) { @@ -62,26 +47,26 @@ static inline void unlock_metapage(struct metapage *mp) wake_up(&mp->wait); } -static void __lock_metapage(struct metapage *mp) +static inline void __lock_metapage(struct metapage *mp) { DECLARE_WAITQUEUE(wait, current); - INCREMENT(mpStat.lockwait); - add_wait_queue_exclusive(&mp->wait, &wait); do { set_current_state(TASK_UNINTERRUPTIBLE); if (metapage_locked(mp)) { - spin_unlock(&meta_lock); + unlock_page(mp->page); schedule(); - spin_lock(&meta_lock); + lock_page(mp->page); } } while (trylock_metapage(mp)); __set_current_state(TASK_RUNNING); remove_wait_queue(&mp->wait, &wait); } -/* needs meta_lock */ +/* + * Must have mp->page locked + */ static inline void lock_metapage(struct metapage *mp) { if (trylock_metapage(mp)) @@ -92,6 +77,110 @@ static inline void lock_metapage(struct metapage *mp) static kmem_cache_t *metapage_cache; static mempool_t *metapage_mempool; +#define MPS_PER_PAGE (PAGE_CACHE_SIZE >> L2PSIZE) + +#if MPS_PER_PAGE > 1 + +struct meta_anchor { + int mp_count; + atomic_t io_count; + struct metapage *mp[MPS_PER_PAGE]; +}; +#define mp_anchor(page) ((struct meta_anchor *)page->private) + +static inline struct metapage *page_to_mp(struct page *page, uint offset) +{ + if (!PagePrivate(page)) + return NULL; + return mp_anchor(page)->mp[offset >> L2PSIZE]; +} + +static inline int insert_metapage(struct page *page, struct metapage *mp) +{ + struct meta_anchor *a; + int index; + int l2mp_blocks; /* log2 blocks per metapage */ + + if (PagePrivate(page)) + a = mp_anchor(page); + else { + a = kmalloc(sizeof(struct meta_anchor), GFP_NOFS); + if (!a) + return -ENOMEM; + memset(a, 0, sizeof(struct meta_anchor)); + page->private = (unsigned long)a; + SetPagePrivate(page); + kmap(page); + } + + if (mp) { + l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits; + index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1); + a->mp_count++; + a->mp[index] = mp; + } + + return 0; +} + +static inline void remove_metapage(struct page *page, struct metapage *mp) +{ + struct meta_anchor *a = mp_anchor(page); + int l2mp_blocks = L2PSIZE - page->mapping->host->i_blkbits; + int index; + + index = (mp->index >> l2mp_blocks) & (MPS_PER_PAGE - 1); + + BUG_ON(a->mp[index] != mp); + + a->mp[index] = NULL; + if (--a->mp_count == 0) { + kfree(a); + page->private = 0; + ClearPagePrivate(page); + kunmap(page); + } +} + +static inline void inc_io(struct page *page) +{ + atomic_inc(&mp_anchor(page)->io_count); +} + +static inline void dec_io(struct page *page, void (*handler) (struct page *)) +{ + if (atomic_dec_and_test(&mp_anchor(page)->io_count)) + handler(page); +} + +#else +static inline struct metapage *page_to_mp(struct page *page, uint offset) +{ + return PagePrivate(page) ? (struct metapage *)page->private : NULL; +} + +static inline int insert_metapage(struct page *page, struct metapage *mp) +{ + if (mp) { + page->private = (unsigned long)mp; + SetPagePrivate(page); + kmap(page); + } + return 0; +} + +static inline void remove_metapage(struct page *page, struct metapage *mp) +{ + page->private = 0; + ClearPagePrivate(page); + kunmap(page); +} + +#define inc_io(page) do {} while(0) +#define dec_io(page, handler) handler(page) + +#endif + static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags) { struct metapage *mp = (struct metapage *)foo; @@ -139,16 +228,6 @@ int __init metapage_init(void) kmem_cache_destroy(metapage_cache); return -ENOMEM; } - /* - * Now the hash list - */ - for (hash_order = 0; - ((PAGE_SIZE << hash_order) / sizeof(void *)) < HASH_SIZE; - hash_order++); - hash_table = - (struct metapage **) __get_free_pages(GFP_KERNEL, hash_order); - assert(hash_table); - memset(hash_table, 0, PAGE_SIZE << hash_order); return 0; } @@ -159,73 +238,388 @@ void metapage_exit(void) kmem_cache_destroy(metapage_cache); } +static inline void drop_metapage(struct page *page, struct metapage *mp) +{ + if (mp->count || mp->nohomeok || test_bit(META_dirty, &mp->flag) || + test_bit(META_io, &mp->flag)) + return; + remove_metapage(page, mp); + INCREMENT(mpStat.pagefree); + free_metapage(mp); +} + /* - * Basically same hash as in pagemap.h, but using our hash table + * Metapage address space operations */ -static struct metapage **meta_hash(struct address_space *mapping, - unsigned long index) + +static sector_t metapage_get_blocks(struct inode *inode, sector_t lblock, + unsigned int *len) { -#define i (((unsigned long)mapping)/ \ - (sizeof(struct inode) & ~(sizeof(struct inode) -1 ))) -#define s(x) ((x) + ((x) >> HASH_BITS)) - return hash_table + (s(i + index) & (HASH_SIZE - 1)); -#undef i -#undef s + int rc = 0; + int xflag; + s64 xaddr; + sector_t file_blocks = (inode->i_size + inode->i_blksize - 1) >> + inode->i_blkbits; + + if (lblock >= file_blocks) + return 0; + if (lblock + *len > file_blocks) + *len = file_blocks - lblock; + + if (inode->i_ino) { + rc = xtLookup(inode, (s64)lblock, *len, &xflag, &xaddr, len, 0); + if ((rc == 0) && *len) + lblock = (sector_t)xaddr; + else + lblock = 0; + } /* else no mapping */ + + return lblock; } -static struct metapage *search_hash(struct metapage ** hash_ptr, - struct address_space *mapping, - unsigned long index) +static void last_read_complete(struct page *page) { - struct metapage *ptr; + if (!PageError(page)) + SetPageUptodate(page); + unlock_page(page); +} + +static int metapage_read_end_io(struct bio *bio, unsigned int bytes_done, + int err) +{ + struct page *page = bio->bi_private; + + if (bio->bi_size) + return 1; - for (ptr = *hash_ptr; ptr; ptr = ptr->hash_next) { - if ((ptr->mapping == mapping) && (ptr->index == index)) - return ptr; + if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { + printk(KERN_ERR "metapage_read_end_io: I/O error\n"); + SetPageError(page); } - return NULL; + dec_io(page, last_read_complete); + bio_put(bio); + + return 0; } -static void add_to_hash(struct metapage * mp, struct metapage ** hash_ptr) +static void remove_from_logsync(struct metapage *mp) { - if (*hash_ptr) - (*hash_ptr)->hash_prev = mp; + struct jfs_log *log = mp->log; + unsigned long flags; +/* + * This can race. Recheck that log hasn't been set to null, and after + * acquiring logsync lock, recheck lsn + */ + if (!log) + return; + + LOGSYNC_LOCK(log, flags); + if (mp->lsn) { + mp->log = NULL; + mp->lsn = 0; + mp->clsn = 0; + log->count--; + list_del(&mp->synclist); + } + LOGSYNC_UNLOCK(log, flags); +} - mp->hash_prev = NULL; - mp->hash_next = *hash_ptr; - *hash_ptr = mp; +static void last_write_complete(struct page *page) +{ + struct metapage *mp; + unsigned int offset; + + for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { + mp = page_to_mp(page, offset); + if (mp && test_bit(META_io, &mp->flag)) { + if (mp->lsn) + remove_from_logsync(mp); + clear_bit(META_io, &mp->flag); + } + /* + * I'd like to call drop_metapage here, but I don't think it's + * safe unless I have the page locked + */ + } + end_page_writeback(page); } -static void remove_from_hash(struct metapage * mp, struct metapage ** hash_ptr) +static int metapage_write_end_io(struct bio *bio, unsigned int bytes_done, + int err) { - if (mp->hash_prev) - mp->hash_prev->hash_next = mp->hash_next; - else { - assert(*hash_ptr == mp); - *hash_ptr = mp->hash_next; + struct page *page = bio->bi_private; + + BUG_ON(!PagePrivate(page)); + + if (bio->bi_size) + return 1; + + if (! test_bit(BIO_UPTODATE, &bio->bi_flags)) { + printk(KERN_ERR "metapage_write_end_io: I/O error\n"); + SetPageError(page); + } + dec_io(page, last_write_complete); + bio_put(bio); + return 0; +} + +static int metapage_writepage(struct page *page, struct writeback_control *wbc) +{ + struct bio *bio = NULL; + unsigned int block_offset; /* block offset of mp within page */ + struct inode *inode = page->mapping->host; + unsigned int blocks_per_mp = JFS_SBI(inode->i_sb)->nbperpage; + unsigned int len; + unsigned int xlen; + struct metapage *mp; + int redirty = 0; + sector_t lblock; + sector_t pblock; + sector_t next_block = 0; + sector_t page_start; + unsigned long bio_bytes = 0; + unsigned long bio_offset = 0; + unsigned int offset; + + page_start = (sector_t)page->index << + (PAGE_CACHE_SHIFT - inode->i_blkbits); + BUG_ON(!PageLocked(page)); + BUG_ON(PageWriteback(page)); + + for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { + mp = page_to_mp(page, offset); + + if (!mp || !test_bit(META_dirty, &mp->flag)) + continue; + + if (mp->nohomeok && !test_bit(META_forcewrite, &mp->flag)) { + redirty = 1; + continue; + } + + clear_bit(META_dirty, &mp->flag); + block_offset = offset >> inode->i_blkbits; + lblock = page_start + block_offset; + if (bio) { + if (xlen && lblock == next_block) { + /* Contiguous, in memory & on disk */ + len = min(xlen, blocks_per_mp); + xlen -= len; + bio_bytes += len << inode->i_blkbits; + set_bit(META_io, &mp->flag); + continue; + } + /* Not contiguous */ + if (bio_add_page(bio, page, bio_bytes, bio_offset) < + bio_bytes) + goto add_failed; + /* + * Increment counter before submitting i/o to keep + * count from hitting zero before we're through + */ + inc_io(page); + if (!bio->bi_size) + goto dump_bio; + submit_bio(WRITE, bio); + bio = NULL; + } else { + set_page_writeback(page); + inc_io(page); + } + xlen = (PAGE_CACHE_SIZE - offset) >> inode->i_blkbits; + pblock = metapage_get_blocks(inode, lblock, &xlen); + if (!pblock) { + /* Need better error handling */ + printk(KERN_ERR "JFS: metapage_get_blocks failed\n"); + dec_io(page, last_write_complete); + continue; + } + set_bit(META_io, &mp->flag); + len = min(xlen, (uint) JFS_SBI(inode->i_sb)->nbperpage); + + bio = bio_alloc(GFP_NOFS, 1); + bio->bi_bdev = inode->i_sb->s_bdev; + bio->bi_sector = pblock << (inode->i_blkbits - 9); + bio->bi_end_io = metapage_write_end_io; + bio->bi_private = page; + + /* Don't call bio_add_page yet, we may add to this vec */ + bio_offset = offset; + bio_bytes = len << inode->i_blkbits; + + xlen -= len; + next_block = lblock + len; + } + if (bio) { + if (bio_add_page(bio, page, bio_bytes, bio_offset) < bio_bytes) + goto add_failed; + if (!bio->bi_size) + goto dump_bio; + + submit_bio(WRITE, bio); + } + if (redirty) + redirty_page_for_writepage(wbc, page); + + unlock_page(page); + + return 0; +add_failed: + /* We should never reach here, since we're only adding one vec */ + printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); + goto skip; +dump_bio: + dump_mem("bio", bio, sizeof(*bio)); +skip: + bio_put(bio); + unlock_page(page); + dec_io(page, last_write_complete); + + return -EIO; +} + +static int metapage_readpage(struct file *fp, struct page *page) +{ + struct inode *inode = page->mapping->host; + struct bio *bio = NULL; + unsigned int block_offset; + unsigned int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits; + sector_t page_start; /* address of page in fs blocks */ + sector_t pblock; + unsigned int xlen; + unsigned int len; + unsigned int offset; + + BUG_ON(!PageLocked(page)); + page_start = (sector_t)page->index << + (PAGE_CACHE_SHIFT - inode->i_blkbits); + + block_offset = 0; + while (block_offset < blocks_per_page) { + xlen = blocks_per_page - block_offset; + pblock = metapage_get_blocks(inode, page_start + block_offset, + &xlen); + if (pblock) { + if (!PagePrivate(page)) + insert_metapage(page, NULL); + inc_io(page); + if (bio) + submit_bio(READ, bio); + + bio = bio_alloc(GFP_NOFS, 1); + bio->bi_bdev = inode->i_sb->s_bdev; + bio->bi_sector = pblock << (inode->i_blkbits - 9); + bio->bi_end_io = metapage_read_end_io; + bio->bi_private = page; + len = xlen << inode->i_blkbits; + offset = block_offset << inode->i_blkbits; + if (bio_add_page(bio, page, len, offset) < len) + goto add_failed; + block_offset += xlen; + } else + block_offset++; } + if (bio) + submit_bio(READ, bio); + else + unlock_page(page); + + return 0; - if (mp->hash_next) - mp->hash_next->hash_prev = mp->hash_prev; +add_failed: + printk(KERN_ERR "JFS: bio_add_page failed unexpectedly\n"); + bio_put(bio); + dec_io(page, last_read_complete); + return -EIO; } +static int metapage_releasepage(struct page *page, int gfp_mask) +{ + struct metapage *mp; + int busy = 0; + unsigned int offset; + + for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) { + mp = page_to_mp(page, offset); + + if (!mp) + continue; + + jfs_info("metapage_releasepage: mp = 0x%p", mp); + if (mp->count || mp->nohomeok) { + jfs_info("count = %ld, nohomeok = %d", mp->count, + mp->nohomeok); + busy = 1; + continue; + } + wait_on_page_writeback(page); + //WARN_ON(test_bit(META_dirty, &mp->flag)); + if (test_bit(META_dirty, &mp->flag)) { + dump_mem("dirty mp in metapage_releasepage", mp, + sizeof(struct metapage)); + dump_mem("page", page, sizeof(struct page)); + dump_stack(); + } + WARN_ON(mp->lsn); + if (mp->lsn) + remove_from_logsync(mp); + remove_metapage(page, mp); + INCREMENT(mpStat.pagefree); + free_metapage(mp); + } + if (busy) + return -1; + + return 0; +} + +static int metapage_invalidatepage(struct page *page, unsigned long offset) +{ + BUG_ON(offset); + + if (PageWriteback(page)) + return 0; + + return metapage_releasepage(page, 0); +} + +struct address_space_operations jfs_metapage_aops = { + .readpage = metapage_readpage, + .writepage = metapage_writepage, + .sync_page = block_sync_page, + .releasepage = metapage_releasepage, + .invalidatepage = metapage_invalidatepage, + .set_page_dirty = __set_page_dirty_nobuffers, +}; + struct metapage *__get_metapage(struct inode *inode, unsigned long lblock, unsigned int size, int absolute, unsigned long new) { - struct metapage **hash_ptr; int l2BlocksPerPage; int l2bsize; struct address_space *mapping; - struct metapage *mp; + struct metapage *mp = NULL; + struct page *page; unsigned long page_index; unsigned long page_offset; - jfs_info("__get_metapage: inode = 0x%p, lblock = 0x%lx", inode, lblock); - + jfs_info("__get_metapage: ino = %ld, lblock = 0x%lx, abs=%d", + inode->i_ino, lblock, absolute); + + l2bsize = inode->i_blkbits; + l2BlocksPerPage = PAGE_CACHE_SHIFT - l2bsize; + page_index = lblock >> l2BlocksPerPage; + page_offset = (lblock - (page_index << l2BlocksPerPage)) << l2bsize; + if ((page_offset + size) > PAGE_CACHE_SIZE) { + jfs_err("MetaData crosses page boundary!!"); + jfs_err("lblock = %lx, size = %d", lblock, size); + dump_stack(); + return NULL; + } if (absolute) - mapping = inode->i_sb->s_bdev->bd_inode->i_mapping; + mapping = JFS_SBI(inode->i_sb)->direct_inode->i_mapping; else { /* * If an nfs client tries to read an inode that is larger @@ -237,312 +631,212 @@ struct metapage *__get_metapage(struct inode *inode, unsigned long lblock, mapping = inode->i_mapping; } - hash_ptr = meta_hash(mapping, lblock); -again: - spin_lock(&meta_lock); - mp = search_hash(hash_ptr, mapping, lblock); + if (new && (PSIZE == PAGE_CACHE_SIZE)) { + page = grab_cache_page(mapping, page_index); + if (!page) { + jfs_err("grab_cache_page failed!"); + return NULL; + } + SetPageUptodate(page); + } else { + page = read_cache_page(mapping, page_index, + (filler_t *)mapping->a_ops->readpage, NULL); + if (IS_ERR(page)) { + jfs_err("read_cache_page failed!"); + return NULL; + } + lock_page(page); + } + + mp = page_to_mp(page, page_offset); if (mp) { - page_found: - if (test_bit(META_stale, &mp->flag)) { - spin_unlock(&meta_lock); - msleep(1); - goto again; + if (mp->logical_size != size) { + jfs_error(inode->i_sb, + "__get_metapage: mp->logical_size != size"); + jfs_err("logical_size = %d, size = %d", + mp->logical_size, size); + dump_stack(); + goto unlock; } mp->count++; lock_metapage(mp); - spin_unlock(&meta_lock); if (test_bit(META_discard, &mp->flag)) { if (!new) { jfs_error(inode->i_sb, "__get_metapage: using a " "discarded metapage"); - release_metapage(mp); - return NULL; + discard_metapage(mp); + goto unlock; } clear_bit(META_discard, &mp->flag); } - jfs_info("__get_metapage: found 0x%p, in hash", mp); - if (mp->logical_size != size) { - jfs_error(inode->i_sb, - "__get_metapage: mp->logical_size != size"); - release_metapage(mp); - return NULL; - } } else { - l2bsize = inode->i_blkbits; - l2BlocksPerPage = PAGE_CACHE_SHIFT - l2bsize; - page_index = lblock >> l2BlocksPerPage; - page_offset = (lblock - (page_index << l2BlocksPerPage)) << - l2bsize; - if ((page_offset + size) > PAGE_CACHE_SIZE) { - spin_unlock(&meta_lock); - jfs_err("MetaData crosses page boundary!!"); - return NULL; - } - - /* - * Locks held on aggregate inode pages are usually - * not held long, and they are taken in critical code - * paths (committing dirty inodes, txCommit thread) - * - * Attempt to get metapage without blocking, tapping into - * reserves if necessary. - */ - mp = NULL; - if (JFS_IP(inode)->fileset == AGGREGATE_I) { - mp = alloc_metapage(GFP_ATOMIC); - if (!mp) { - /* - * mempool is supposed to protect us from - * failing here. We will try a blocking - * call, but a deadlock is possible here - */ - printk(KERN_WARNING - "__get_metapage: atomic call to mempool_alloc failed.\n"); - printk(KERN_WARNING - "Will attempt blocking call\n"); - } - } - if (!mp) { - struct metapage *mp2; - - spin_unlock(&meta_lock); - mp = alloc_metapage(GFP_NOFS); - spin_lock(&meta_lock); - - /* we dropped the meta_lock, we need to search the - * hash again. - */ - mp2 = search_hash(hash_ptr, mapping, lblock); - if (mp2) { - free_metapage(mp); - mp = mp2; - goto page_found; - } - } + INCREMENT(mpStat.pagealloc); + mp = alloc_metapage(GFP_NOFS); + mp->page = page; mp->flag = 0; - lock_metapage(mp); - if (absolute) - set_bit(META_absolute, &mp->flag); mp->xflag = COMMIT_PAGE; mp->count = 1; - atomic_set(&mp->nohomeok,0); - mp->mapping = mapping; - mp->index = lblock; - mp->page = NULL; + mp->nohomeok = 0; mp->logical_size = size; - add_to_hash(mp, hash_ptr); - spin_unlock(&meta_lock); - - if (new) { - jfs_info("__get_metapage: Calling grab_cache_page"); - mp->page = grab_cache_page(mapping, page_index); - if (!mp->page) { - jfs_err("grab_cache_page failed!"); - goto freeit; - } else { - INCREMENT(mpStat.pagealloc); - unlock_page(mp->page); - } - } else { - jfs_info("__get_metapage: Calling read_cache_page"); - mp->page = read_cache_page(mapping, lblock, - (filler_t *)mapping->a_ops->readpage, NULL); - if (IS_ERR(mp->page)) { - jfs_err("read_cache_page failed!"); - goto freeit; - } else - INCREMENT(mpStat.pagealloc); + mp->data = page_address(page) + page_offset; + mp->index = lblock; + if (unlikely(insert_metapage(page, mp))) { + free_metapage(mp); + goto unlock; } - mp->data = kmap(mp->page) + page_offset; + lock_metapage(mp); } - if (new) + if (new) { + jfs_info("zeroing mp = 0x%p", mp); memset(mp->data, 0, PSIZE); + } - jfs_info("__get_metapage: returning = 0x%p", mp); + unlock_page(page); + jfs_info("__get_metapage: returning = 0x%p data = 0x%p", mp, mp->data); return mp; -freeit: - spin_lock(&meta_lock); - remove_from_hash(mp, hash_ptr); - free_metapage(mp); - spin_unlock(&meta_lock); +unlock: + unlock_page(page); return NULL; } -void hold_metapage(struct metapage * mp, int force) +void grab_metapage(struct metapage * mp) { - spin_lock(&meta_lock); - + jfs_info("grab_metapage: mp = 0x%p", mp); + page_cache_get(mp->page); + lock_page(mp->page); mp->count++; - - if (force) { - ASSERT (!(test_bit(META_forced, &mp->flag))); - if (trylock_metapage(mp)) - set_bit(META_forced, &mp->flag); - } else - lock_metapage(mp); - - spin_unlock(&meta_lock); + lock_metapage(mp); + unlock_page(mp->page); } -static void __write_metapage(struct metapage * mp) +void force_metapage(struct metapage *mp) { - int l2bsize = mp->mapping->host->i_blkbits; - int l2BlocksPerPage = PAGE_CACHE_SHIFT - l2bsize; - unsigned long page_index; - unsigned long page_offset; - int rc; - - jfs_info("__write_metapage: mp = 0x%p", mp); - - page_index = mp->page->index; - page_offset = - (mp->index - (page_index << l2BlocksPerPage)) << l2bsize; + 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); + page_cache_get(page); + lock_page(page); + set_page_dirty(page); + write_one_page(page, 1); + clear_bit(META_forcewrite, &mp->flag); + page_cache_release(page); +} +extern void hold_metapage(struct metapage *mp) +{ lock_page(mp->page); - rc = mp->mapping->a_ops->prepare_write(NULL, mp->page, page_offset, - page_offset + - mp->logical_size); - if (rc) { - jfs_err("prepare_write return %d!", rc); - ClearPageUptodate(mp->page); +} + +extern void put_metapage(struct metapage *mp) +{ + if (mp->count || mp->nohomeok) { + /* Someone else will release this */ unlock_page(mp->page); - clear_bit(META_dirty, &mp->flag); return; } - rc = mp->mapping->a_ops->commit_write(NULL, mp->page, page_offset, - page_offset + - mp->logical_size); - if (rc) { - jfs_err("commit_write returned %d", rc); - } - + page_cache_get(mp->page); + mp->count++; + lock_metapage(mp); unlock_page(mp->page); - clear_bit(META_dirty, &mp->flag); - - jfs_info("__write_metapage done"); -} - -static inline void sync_metapage(struct metapage *mp) -{ - struct page *page = mp->page; - - page_cache_get(page); - lock_page(page); - - /* we're done with this page - no need to check for errors */ - if (page_has_buffers(page)) - write_one_page(page, 1); - else - unlock_page(page); - page_cache_release(page); + release_metapage(mp); } void release_metapage(struct metapage * mp) { - struct jfs_log *log; - + struct page *page = mp->page; jfs_info("release_metapage: mp = 0x%p, flag = 0x%lx", mp, mp->flag); - spin_lock(&meta_lock); - if (test_bit(META_forced, &mp->flag)) { - clear_bit(META_forced, &mp->flag); - mp->count--; - spin_unlock(&meta_lock); - return; - } + BUG_ON(!page); + + lock_page(page); + unlock_metapage(mp); assert(mp->count); - if (--mp->count || atomic_read(&mp->nohomeok)) { - unlock_metapage(mp); - spin_unlock(&meta_lock); + if (--mp->count || mp->nohomeok) { + unlock_page(page); + page_cache_release(page); return; } - if (mp->page) { - set_bit(META_stale, &mp->flag); - spin_unlock(&meta_lock); - kunmap(mp->page); - mp->data = NULL; - if (test_bit(META_dirty, &mp->flag)) - __write_metapage(mp); + if (test_bit(META_dirty, &mp->flag)) { + set_page_dirty(page); if (test_bit(META_sync, &mp->flag)) { - sync_metapage(mp); clear_bit(META_sync, &mp->flag); + write_one_page(page, 1); + lock_page(page); /* write_one_page unlocks the page */ } + } else if (mp->lsn) /* discard_metapage doesn't remove it */ + remove_from_logsync(mp); - if (test_bit(META_discard, &mp->flag)) { - lock_page(mp->page); - block_invalidatepage(mp->page, 0); - unlock_page(mp->page); - } - - page_cache_release(mp->page); - mp->page = NULL; - INCREMENT(mpStat.pagefree); - spin_lock(&meta_lock); - } +#if MPS_PER_PAGE == 1 + /* + * If we know this is the only thing in the page, we can throw + * the page out of the page cache. If pages are larger, we + * don't want to do this. + */ - if (mp->lsn) { - /* - * Remove metapage from logsynclist. - */ - log = mp->log; - LOGSYNC_LOCK(log); - mp->log = NULL; - mp->lsn = 0; - mp->clsn = 0; - log->count--; - list_del(&mp->synclist); - LOGSYNC_UNLOCK(log); + /* Retest mp->count since we may have released page lock */ + if (test_bit(META_discard, &mp->flag) && !mp->count) { + clear_page_dirty(page); + ClearPageUptodate(page); +#ifdef _NOT_YET + if (page->mapping) { + /* Remove from page cache and page cache reference */ + remove_from_page_cache(page); + page_cache_release(page); + metapage_releasepage(page, 0); + } +#endif } - remove_from_hash(mp, meta_hash(mp->mapping, mp->index)); - spin_unlock(&meta_lock); - - free_metapage(mp); +#else + /* Try to keep metapages from using up too much memory */ + drop_metapage(page, mp); +#endif + unlock_page(page); + page_cache_release(page); } void __invalidate_metapages(struct inode *ip, s64 addr, int len) { - struct metapage **hash_ptr; - unsigned long lblock; + sector_t lblock; int l2BlocksPerPage = PAGE_CACHE_SHIFT - ip->i_blkbits; + int BlocksPerPage = 1 << l2BlocksPerPage; /* All callers are interested in block device's mapping */ - struct address_space *mapping = ip->i_sb->s_bdev->bd_inode->i_mapping; + struct address_space *mapping = + JFS_SBI(ip->i_sb)->direct_inode->i_mapping; struct metapage *mp; struct page *page; + unsigned int offset; /* - * First, mark metapages to discard. They will eventually be + * Mark metapages to discard. They will eventually be * released, but should not be written. */ - for (lblock = addr; lblock < addr + len; - lblock += 1 << l2BlocksPerPage) { - hash_ptr = meta_hash(mapping, lblock); -again: - spin_lock(&meta_lock); - mp = search_hash(hash_ptr, mapping, lblock); - if (mp) { - if (test_bit(META_stale, &mp->flag)) { - spin_unlock(&meta_lock); - msleep(1); - goto again; - } + 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_CACHE_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); - spin_unlock(&meta_lock); - } else { - spin_unlock(&meta_lock); - page = find_lock_page(mapping, lblock>>l2BlocksPerPage); - if (page) { - block_invalidatepage(page, 0); - unlock_page(page); - page_cache_release(page); - } + if (mp->lsn) + remove_from_logsync(mp); } + unlock_page(page); + page_cache_release(page); } } |