/*
- * 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
*/
#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"
#include "jfs_txnmgr.h"
#include "jfs_debug.h"
-static DEFINE_SPINLOCK(meta_lock);
-
#ifdef CONFIG_JFS_STATISTICS
static struct {
uint pagealloc; /* # of page allocations */
} 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)
{
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))
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;
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;
}
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
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);
}
}
git.samba.org / sfrench / cifs-2.6.git / commitdiff