[PATCH] pass b_size to ->get_block()
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>
diff --git a/fs/buffer.c b/fs/buffer.c
index e7a1461..a507b58 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1738,6 +1738,7 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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;
}