#include <linux/buffer_head.h>
#include <linux/mm.h>
#include <linux/backing-dev.h>
+#include <linux/gfp.h>
#include "nilfs.h"
#include "mdt.h"
#include "dat.h"
#include "page.h"
#include "btnode.h"
-
-void nilfs_btnode_cache_init_once(struct address_space *btnc)
+void nilfs_btnode_cache_clear(struct address_space *btnc)
{
- INIT_RADIX_TREE(&btnc->page_tree, GFP_ATOMIC);
- spin_lock_init(&btnc->tree_lock);
- INIT_LIST_HEAD(&btnc->private_list);
- spin_lock_init(&btnc->private_lock);
-
- spin_lock_init(&btnc->i_mmap_lock);
- INIT_RAW_PRIO_TREE_ROOT(&btnc->i_mmap);
- INIT_LIST_HEAD(&btnc->i_mmap_nonlinear);
+ invalidate_mapping_pages(btnc, 0, -1);
+ truncate_inode_pages(btnc, 0);
}
-static struct address_space_operations def_btnode_aops;
-
-void nilfs_btnode_cache_init(struct address_space *btnc)
+struct buffer_head *
+nilfs_btnode_create_block(struct address_space *btnc, __u64 blocknr)
{
- btnc->host = NULL; /* can safely set to host inode ? */
- btnc->flags = 0;
- mapping_set_gfp_mask(btnc, GFP_NOFS);
- btnc->assoc_mapping = NULL;
- btnc->backing_dev_info = &default_backing_dev_info;
- btnc->a_ops = &def_btnode_aops;
-}
+ struct inode *inode = NILFS_BTNC_I(btnc);
+ struct buffer_head *bh;
-void nilfs_btnode_cache_clear(struct address_space *btnc)
-{
- invalidate_mapping_pages(btnc, 0, -1);
- truncate_inode_pages(btnc, 0);
+ bh = nilfs_grab_buffer(inode, btnc, blocknr, 1 << BH_NILFS_Node);
+ if (unlikely(!bh))
+ return NULL;
+
+ if (unlikely(buffer_mapped(bh) || buffer_uptodate(bh) ||
+ buffer_dirty(bh))) {
+ brelse(bh);
+ BUG();
+ }
+ memset(bh->b_data, 0, 1 << inode->i_blkbits);
+ bh->b_bdev = inode->i_sb->s_bdev;
+ bh->b_blocknr = blocknr;
+ set_buffer_mapped(bh);
+ set_buffer_uptodate(bh);
+
+ unlock_page(bh->b_page);
+ page_cache_release(bh->b_page);
+ return bh;
}
int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr,
- sector_t pblocknr, struct buffer_head **pbh,
- int newblk)
+ sector_t pblocknr, int mode,
+ struct buffer_head **pbh, sector_t *submit_ptr)
{
struct buffer_head *bh;
struct inode *inode = NILFS_BTNC_I(btnc);
+ struct page *page;
int err;
bh = nilfs_grab_buffer(inode, btnc, blocknr, 1 << BH_NILFS_Node);
return -ENOMEM;
err = -EEXIST; /* internal code */
- if (newblk) {
- if (unlikely(buffer_mapped(bh) || buffer_uptodate(bh) ||
- buffer_dirty(bh))) {
- brelse(bh);
- BUG();
- }
- bh->b_bdev = NILFS_I_NILFS(inode)->ns_bdev;
- bh->b_blocknr = blocknr;
- set_buffer_mapped(bh);
- set_buffer_uptodate(bh);
- goto found;
- }
+ page = bh->b_page;
if (buffer_uptodate(bh) || buffer_dirty(bh))
goto found;
if (pblocknr == 0) {
pblocknr = blocknr;
if (inode->i_ino != NILFS_DAT_INO) {
- struct inode *dat =
- nilfs_dat_inode(NILFS_I_NILFS(inode));
+ struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
/* blocknr is a virtual block number */
- err = nilfs_dat_translate(dat, blocknr, &pblocknr);
+ err = nilfs_dat_translate(nilfs->ns_dat, blocknr,
+ &pblocknr);
if (unlikely(err)) {
brelse(bh);
goto out_locked;
}
}
}
- lock_buffer(bh);
+
+ if (mode == READA) {
+ if (pblocknr != *submit_ptr + 1 || !trylock_buffer(bh)) {
+ err = -EBUSY; /* internal code */
+ brelse(bh);
+ goto out_locked;
+ }
+ } else { /* mode == READ */
+ lock_buffer(bh);
+ }
if (buffer_uptodate(bh)) {
unlock_buffer(bh);
err = -EEXIST; /* internal code */
goto found;
}
set_buffer_mapped(bh);
- bh->b_bdev = NILFS_I_NILFS(inode)->ns_bdev;
+ bh->b_bdev = inode->i_sb->s_bdev;
bh->b_blocknr = pblocknr; /* set block address for read */
bh->b_end_io = end_buffer_read_sync;
get_bh(bh);
- submit_bh(READ, bh);
+ submit_bh(mode, bh);
bh->b_blocknr = blocknr; /* set back to the given block address */
+ *submit_ptr = pblocknr;
err = 0;
found:
*pbh = bh;
out_locked:
- unlock_page(bh->b_page);
- page_cache_release(bh->b_page);
+ unlock_page(page);
+ page_cache_release(page);
return err;
}
-int nilfs_btnode_get(struct address_space *btnc, __u64 blocknr,
- sector_t pblocknr, struct buffer_head **pbh, int newblk)
-{
- struct buffer_head *bh;
- int err;
-
- err = nilfs_btnode_submit_block(btnc, blocknr, pblocknr, pbh, newblk);
- if (err == -EEXIST) /* internal code (cache hit) */
- return 0;
- if (unlikely(err))
- return err;
-
- bh = *pbh;
- wait_on_buffer(bh);
- if (!buffer_uptodate(bh)) {
- brelse(bh);
- return -EIO;
- }
- return 0;
-}
-
/**
* nilfs_btnode_delete - delete B-tree node buffer
* @bh: buffer to be deleted
* We cannot call radix_tree_preload for the kernels older
* than 2.6.23, because it is not exported for modules.
*/
+retry:
err = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
if (err)
goto failed_unlock;
(unsigned long long)oldkey,
(unsigned long long)newkey);
-retry:
spin_lock_irq(&btnc->tree_lock);
err = radix_tree_insert(&btnc->page_tree, newkey, obh->b_page);
spin_unlock_irq(&btnc->tree_lock);
unlock_page(obh->b_page);
}
- err = nilfs_btnode_get(btnc, newkey, 0, &nbh, 1);
- if (likely(!err)) {
- BUG_ON(nbh == obh);
- ctxt->newbh = nbh;
- }
- return err;
+ nbh = nilfs_btnode_create_block(btnc, newkey);
+ if (!nbh)
+ return -ENOMEM;
+
+ BUG_ON(nbh == obh);
+ ctxt->newbh = nbh;
+ return 0;
failed_unlock:
unlock_page(obh->b_page);
"invalid oldkey %lld (newkey=%lld)",
(unsigned long long)oldkey,
(unsigned long long)newkey);
- if (!test_set_buffer_dirty(obh) && TestSetPageDirty(opage))
- BUG();
+ mark_buffer_dirty(obh);
spin_lock_irq(&btnc->tree_lock);
radix_tree_delete(&btnc->page_tree, oldkey);
unlock_page(opage);
} else {
nilfs_copy_buffer(nbh, obh);
- nilfs_btnode_mark_dirty(nbh);
+ mark_buffer_dirty(nbh);
nbh->b_blocknr = newkey;
ctxt->bh = nbh;
Code Review / linux-3.10.git / blobdiff