*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
+ * the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
- *
+ *
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
+ * along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include <linux/mm.h>
+#include <linux/module.h>
#include <linux/bio.h>
#include <linux/init.h>
#include <linux/buffer_head.h>
#include <linux/mempool.h>
+#include <linux/seq_file.h>
#include "jfs_incore.h"
#include "jfs_superblock.h"
#include "jfs_filsys.h"
#endif
#define metapage_locked(mp) test_bit(META_locked, &(mp)->flag)
-#define trylock_metapage(mp) test_and_set_bit(META_locked, &(mp)->flag)
+#define trylock_metapage(mp) test_and_set_bit_lock(META_locked, &(mp)->flag)
static inline void unlock_metapage(struct metapage *mp)
{
- clear_bit(META_locked, &mp->flag);
+ clear_bit_unlock(META_locked, &mp->flag);
wake_up(&mp->wait);
}
set_current_state(TASK_UNINTERRUPTIBLE);
if (metapage_locked(mp)) {
unlock_page(mp->page);
- schedule();
+ io_schedule();
lock_page(mp->page);
}
} while (trylock_metapage(mp));
}
#define METAPOOL_MIN_PAGES 32
-static kmem_cache_t *metapage_cache;
+static struct kmem_cache *metapage_cache;
static mempool_t *metapage_mempool;
#define MPS_PER_PAGE (PAGE_CACHE_SIZE >> L2PSIZE)
atomic_t io_count;
struct metapage *mp[MPS_PER_PAGE];
};
-#define mp_anchor(page) ((struct meta_anchor *)page->private)
+#define mp_anchor(page) ((struct meta_anchor *)page_private(page))
-static inline struct metapage *page_to_mp(struct page *page, uint offset)
+static inline struct metapage *page_to_mp(struct page *page, int offset)
{
if (!PagePrivate(page))
return NULL;
if (PagePrivate(page))
a = mp_anchor(page);
else {
- a = kmalloc(sizeof(struct meta_anchor), GFP_NOFS);
+ a = kzalloc(sizeof(struct meta_anchor), GFP_NOFS);
if (!a)
return -ENOMEM;
- memset(a, 0, sizeof(struct meta_anchor));
- page->private = (unsigned long)a;
+ set_page_private(page, (unsigned long)a);
SetPagePrivate(page);
kmap(page);
}
a->mp[index] = NULL;
if (--a->mp_count == 0) {
kfree(a);
- page->private = 0;
+ set_page_private(page, 0);
ClearPagePrivate(page);
kunmap(page);
}
}
#else
-static inline struct metapage *page_to_mp(struct page *page, uint offset)
+static inline struct metapage *page_to_mp(struct page *page, int offset)
{
- return PagePrivate(page) ? (struct metapage *)page->private : NULL;
+ return PagePrivate(page) ? (struct metapage *)page_private(page) : NULL;
}
static inline int insert_metapage(struct page *page, struct metapage *mp)
{
if (mp) {
- page->private = (unsigned long)mp;
+ set_page_private(page, (unsigned long)mp);
SetPagePrivate(page);
kmap(page);
}
static inline void remove_metapage(struct page *page, struct metapage *mp)
{
- page->private = 0;
+ set_page_private(page, 0);
ClearPagePrivate(page);
kunmap(page);
}
#endif
-static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
+static void init_once(void *foo)
{
struct metapage *mp = (struct metapage *)foo;
- if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
- SLAB_CTOR_CONSTRUCTOR) {
- mp->lid = 0;
- mp->lsn = 0;
- mp->flag = 0;
- mp->data = NULL;
- mp->clsn = 0;
- mp->log = NULL;
- set_bit(META_free, &mp->flag);
- init_waitqueue_head(&mp->wait);
- }
+ mp->lid = 0;
+ mp->lsn = 0;
+ mp->flag = 0;
+ mp->data = NULL;
+ mp->clsn = 0;
+ mp->log = NULL;
+ set_bit(META_free, &mp->flag);
+ init_waitqueue_head(&mp->wait);
}
-static inline struct metapage *alloc_metapage(unsigned int gfp_mask)
+static inline struct metapage *alloc_metapage(gfp_t gfp_mask)
{
return mempool_alloc(metapage_mempool, gfp_mask);
}
* Allocate the metapage structures
*/
metapage_cache = kmem_cache_create("jfs_mp", sizeof(struct metapage),
- 0, 0, init_once, NULL);
+ 0, 0, init_once);
if (metapage_cache == NULL)
return -ENOMEM;
- metapage_mempool = mempool_create(METAPOOL_MIN_PAGES, mempool_alloc_slab,
- mempool_free_slab, metapage_cache);
+ metapage_mempool = mempool_create_slab_pool(METAPOOL_MIN_PAGES,
+ metapage_cache);
if (metapage_mempool == NULL) {
kmem_cache_destroy(metapage_cache);
*/
static sector_t metapage_get_blocks(struct inode *inode, sector_t lblock,
- unsigned int *len)
+ int *len)
{
int rc = 0;
int xflag;
s64 xaddr;
- sector_t file_blocks = (inode->i_size + inode->i_blksize - 1) >>
+ sector_t file_blocks = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
inode->i_blkbits;
if (lblock >= file_blocks)
unlock_page(page);
}
-static int metapage_read_end_io(struct bio *bio, unsigned int bytes_done,
- int err)
+static void metapage_read_end_io(struct bio *bio, int err)
{
struct page *page = bio->bi_private;
- if (bio->bi_size)
- return 1;
-
if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
printk(KERN_ERR "metapage_read_end_io: I/O error\n");
SetPageError(page);
dec_io(page, last_read_complete);
bio_put(bio);
-
- return 0;
}
static void remove_from_logsync(struct metapage *mp)
end_page_writeback(page);
}
-static int metapage_write_end_io(struct bio *bio, unsigned int bytes_done,
- int err)
+static void metapage_write_end_io(struct bio *bio, int err)
{
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 */
+ 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;
+ int blocks_per_mp = JFS_SBI(inode->i_sb)->nbperpage;
+ int len;
+ int xlen;
struct metapage *mp;
int redirty = 0;
sector_t lblock;
+ int nr_underway = 0;
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;
+ int offset;
+ int bad_blocks = 0;
page_start = (sector_t)page->index <<
(PAGE_CACHE_SHIFT - inode->i_blkbits);
BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) {
mp = page_to_mp(page, offset);
if (mp->nohomeok && !test_bit(META_forcewrite, &mp->flag)) {
redirty = 1;
+ /*
+ * Make sure this page isn't blocked indefinitely.
+ * If the journal isn't undergoing I/O, push it
+ */
+ if (mp->log && !(mp->log->cflag & logGC_PAGEOUT))
+ jfs_flush_journal(mp->log, 0);
continue;
}
clear_bit(META_dirty, &mp->flag);
+ set_bit(META_io, &mp->flag);
block_offset = offset >> inode->i_blkbits;
lblock = page_start + block_offset;
if (bio) {
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->bi_size)
goto dump_bio;
submit_bio(WRITE, bio);
+ nr_underway++;
bio = NULL;
- } else {
- set_page_writeback(page);
+ } else
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);
+ /*
+ * We already called inc_io(), but can't cancel it
+ * with dec_io() until we're done with the page
+ */
+ bad_blocks++;
continue;
}
- set_bit(META_io, &mp->flag);
- len = min(xlen, (uint) JFS_SBI(inode->i_sb)->nbperpage);
+ len = min(xlen, (int)JFS_SBI(inode->i_sb)->nbperpage);
bio = bio_alloc(GFP_NOFS, 1);
bio->bi_bdev = inode->i_sb->s_bdev;
goto add_failed;
if (!bio->bi_size)
goto dump_bio;
-
+
submit_bio(WRITE, bio);
+ nr_underway++;
}
if (redirty)
redirty_page_for_writepage(wbc, page);
unlock_page(page);
+ if (bad_blocks)
+ goto err_out;
+
+ if (nr_underway == 0)
+ end_page_writeback(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));
+ print_hex_dump(KERN_ERR, "JFS: dump of bio: ", DUMP_PREFIX_ADDRESS, 16,
+ 4, bio, sizeof(*bio), 0);
skip:
bio_put(bio);
unlock_page(page);
dec_io(page, last_write_complete);
-
+err_out:
+ while (bad_blocks--)
+ dec_io(page, last_write_complete);
return -EIO;
}
{
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;
+ int block_offset;
+ 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;
+ int xlen;
unsigned int len;
- unsigned int offset;
+ int offset;
BUG_ON(!PageLocked(page));
page_start = (sector_t)page->index <<
return -EIO;
}
-static int metapage_releasepage(struct page *page, int gfp_mask)
+static int metapage_releasepage(struct page *page, gfp_t gfp_mask)
{
struct metapage *mp;
- int busy = 0;
- unsigned int offset;
+ int ret = 1;
+ int offset;
for (offset = 0; offset < PAGE_CACHE_SIZE; offset += PSIZE) {
mp = page_to_mp(page, offset);
continue;
jfs_info("metapage_releasepage: mp = 0x%p", mp);
- if (mp->count || mp->nohomeok) {
+ if (mp->count || mp->nohomeok ||
+ test_bit(META_dirty, &mp->flag)) {
jfs_info("count = %ld, nohomeok = %d", mp->count,
mp->nohomeok);
- busy = 1;
+ ret = 0;
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;
+ return ret;
}
-static int metapage_invalidatepage(struct page *page, unsigned long offset)
+static void metapage_invalidatepage(struct page *page, unsigned long offset)
{
BUG_ON(offset);
- if (PageWriteback(page))
- return 0;
+ BUG_ON(PageWriteback(page));
- return metapage_releasepage(page, 0);
+ metapage_releasepage(page, 0);
}
-struct address_space_operations jfs_metapage_aops = {
+const struct address_space_operations jfs_metapage_aops = {
.readpage = metapage_readpage,
.writepage = metapage_writepage,
.sync_page = block_sync_page,
}
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!");
+ 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);
jfs_err("logical_size = %d, size = %d",
mp->logical_size, size);
dump_stack();
- goto unlock;
+ goto unlock;
}
mp->count++;
lock_metapage(mp);
"__get_metapage: using a "
"discarded metapage");
discard_metapage(mp);
- goto unlock;
+ goto unlock;
}
clear_bit(META_discard, &mp->flag);
}
} else if (mp->lsn) /* discard_metapage doesn't remove it */
remove_from_logsync(mp);
-#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.
- */
-
- /* 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
- }
-#else
/* Try to keep metapages from using up too much memory */
drop_metapage(page, mp);
-#endif
+
unlock_page(page);
page_cache_release(page);
}
}
#ifdef CONFIG_JFS_STATISTICS
-int jfs_mpstat_read(char *buffer, char **start, off_t offset, int length,
- int *eof, void *data)
+static int jfs_mpstat_proc_show(struct seq_file *m, void *v)
{
- int len = 0;
- off_t begin;
-
- len += sprintf(buffer,
+ seq_printf(m,
"JFS Metapage statistics\n"
"=======================\n"
"page allocations = %d\n"
mpStat.pagealloc,
mpStat.pagefree,
mpStat.lockwait);
+ return 0;
+}
- begin = offset;
- *start = buffer + begin;
- len -= begin;
-
- if (len > length)
- len = length;
- else
- *eof = 1;
-
- if (len < 0)
- len = 0;
-
- return len;
+static int jfs_mpstat_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, jfs_mpstat_proc_show, NULL);
}
+
+const struct file_operations jfs_mpstat_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = jfs_mpstat_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
#endif
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff