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[PATCH] pass b_size to ->get_block()

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Pass amount of disk needs to be mapped to get_block().  This way one can
modify the fs ->get_block() functions to map multiple blocks at the same time.

[akpm@osdl.org: performance tweak]
[akpm@osdl.org: remove unneeded assignments]
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Badari Pulavarty 2006-03-26 01:38:00 -08:00 committed by Linus Torvalds
parent 205f87f6b3
commit b0cf2321c6
3 changed files with 11 additions and 1 deletions
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9
fs/buffer.c
View file

@ -1738,6 +1738,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
sector_t block;
sector_t last_block;
struct buffer_head *bh, *head;
const unsigned blocksize = 1 << inode->i_blkbits;
int nr_underway = 0;
BUG_ON(!PageLocked(page));
@ -1745,7 +1746,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
if (!page_has_buffers(page)) {
create_empty_buffers(page, 1 << inode->i_blkbits,
create_empty_buffers(page, blocksize,
(1 << BH_Dirty)|(1 << BH_Uptodate));
}
@ -1780,6 +1781,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
clear_buffer_dirty(bh);
set_buffer_uptodate(bh);
} else if (!buffer_mapped(bh) && buffer_dirty(bh)) {
WARN_ON(bh->b_size != blocksize);
err = get_block(inode, block, bh, 1);
if (err)
goto recover;
@ -1933,6 +1935,7 @@ static int __block_prepare_write(struct inode *inode, struct page *page,
if (buffer_new(bh))
clear_buffer_new(bh);
if (!buffer_mapped(bh)) {
WARN_ON(bh->b_size != blocksize);
err = get_block(inode, block, bh, 1);
if (err)
break;
@ -2088,6 +2091,7 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
fully_mapped = 0;
if (iblock < lblock) {
WARN_ON(bh->b_size != blocksize);
err = get_block(inode, iblock, bh, 0);
if (err)
SetPageError(page);
@ -2409,6 +2413,7 @@ int nobh_prepare_write(struct page *page, unsigned from, unsigned to,
create = 1;
if (block_start >= to)
create = 0;
map_bh.b_size = blocksize;
ret = get_block(inode, block_in_file + block_in_page,
&map_bh, create);
if (ret)
@ -2669,6 +2674,7 @@ int block_truncate_page(struct address_space *mapping,
err = 0;
if (!buffer_mapped(bh)) {
WARN_ON(bh->b_size != blocksize);
err = get_block(inode, iblock, bh, 0);
if (err)
goto unlock;
@ -2755,6 +2761,7 @@ sector_t generic_block_bmap(struct address_space *mapping, sector_t block,
struct inode *inode = mapping->host;
tmp.b_state = 0;
tmp.b_blocknr = 0;
tmp.b_size = 1 << inode->i_blkbits;
get_block(inode, block, &tmp, 0);
return tmp.b_blocknr;
}

2
fs/mpage.c
View file

@ -192,6 +192,7 @@ do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages,
page_block++, block_in_file++) {
bh.b_state = 0;
if (block_in_file < last_block) {
bh.b_size = blocksize;
if (get_block(inode, block_in_file, &bh, 0))
goto confused;
}
@ -472,6 +473,7 @@ __mpage_writepage(struct bio *bio, struct page *page, get_block_t get_block,
for (page_block = 0; page_block < blocks_per_page; ) {
map_bh.b_state = 0;
map_bh.b_size = 1 << blkbits;
if (get_block(inode, block_in_file, &map_bh, 1))
goto confused;
if (buffer_new(&map_bh))

1
include/linux/buffer_head.h
View file

@ -280,6 +280,7 @@ map_bh(struct buffer_head *bh, struct super_block *sb, sector_t block)
set_buffer_mapped(bh);
bh->b_bdev = sb->s_bdev;
bh->b_blocknr = block;
bh->b_size = sb->s_blocksize;
}
/*