[RFC][PATCH 6/9] -Wshadow: 'map_bh' and 'wbc' shadow fixes
From: Jesper Juhl
Date: Mon Jul 10 2006 - 07:14:36 EST
(please see the mail titled
"[RFC][PATCH 0/9] -Wshadow: Making the kernel build clean with -Wshadow"
for an explanation of why I'm doing this)
Fixes for the following -Wshadow warnings :
fs/buffer.c:2377: warning: declaration of 'map_bh' shadows a global declaration
include/linux/buffer_head.h:279: warning: shadowed declaration is here
fs/mpage.c:177: warning: declaration of 'map_bh' shadows a global declaration
include/linux/buffer_head.h:279: warning: shadowed declaration is here
fs/mpage.c:393: warning: declaration of 'map_bh' shadows a global declaration
include/linux/buffer_head.h:279: warning: shadowed declaration is here
fs/mpage.c:431: warning: declaration of 'map_bh' shadows a global declaration
include/linux/buffer_head.h:279: warning: shadowed declaration is here
fs/mpage.c:479: warning: declaration of 'map_bh' shadows a global declaration
include/linux/buffer_head.h:279: warning: shadowed declaration is here
fs/mpage.c:706: warning: declaration of 'wbc' shadows a parameter
fs/mpage.c:699: warning: shadowed declaration is here
fs/direct-io.c:515: warning: declaration of 'map_bh' shadows a global declaration
include/linux/buffer_head.h:279: warning: shadowed declaration is here
fs/direct-io.c:802: warning: declaration of 'map_bh' shadows a global declaration
include/linux/buffer_head.h:279: warning: shadowed declaration is here
Signed-off-by: Jesper Juhl <jesper.juhl@xxxxxxxxx>
---
fs/buffer.c | 28 +++++++--------
fs/direct-io.c | 24 ++++++-------
fs/mpage.c | 84 +++++++++++++++++++++++------------------------
3 files changed, 68 insertions(+), 68 deletions(-)
--- linux-2.6.18-rc1-orig/fs/buffer.c 2006-07-06 19:39:47.000000000 +0200
+++ linux-2.6.18-rc1/fs/buffer.c 2006-07-09 20:53:26.000000000 +0200
@@ -2374,7 +2374,7 @@ int nobh_prepare_write(struct page *page
struct inode *inode = page->mapping->host;
const unsigned blkbits = inode->i_blkbits;
const unsigned blocksize = 1 << blkbits;
- struct buffer_head map_bh;
+ struct buffer_head bh_map;
struct buffer_head *read_bh[MAX_BUF_PER_PAGE];
unsigned block_in_page;
unsigned block_start;
@@ -2390,7 +2390,7 @@ int nobh_prepare_write(struct page *page
return 0;
block_in_file = (sector_t)page->index << (PAGE_CACHE_SHIFT - blkbits);
- map_bh.b_page = page;
+ bh_map.b_page = page;
/*
* We loop across all blocks in the page, whether or not they are
@@ -2403,23 +2403,23 @@ int nobh_prepare_write(struct page *page
unsigned block_end = block_start + blocksize;
int create;
- map_bh.b_state = 0;
+ bh_map.b_state = 0;
create = 1;
if (block_start >= to)
create = 0;
- map_bh.b_size = blocksize;
+ bh_map.b_size = blocksize;
ret = get_block(inode, block_in_file + block_in_page,
- &map_bh, create);
+ &bh_map, create);
if (ret)
goto failed;
- if (!buffer_mapped(&map_bh))
+ if (!buffer_mapped(&bh_map))
is_mapped_to_disk = 0;
- if (buffer_new(&map_bh))
- unmap_underlying_metadata(map_bh.b_bdev,
- map_bh.b_blocknr);
+ if (buffer_new(&bh_map))
+ unmap_underlying_metadata(bh_map.b_bdev,
+ bh_map.b_blocknr);
if (PageUptodate(page))
continue;
- if (buffer_new(&map_bh) || !buffer_mapped(&map_bh)) {
+ if (buffer_new(&bh_map) || !buffer_mapped(&bh_map)) {
kaddr = kmap_atomic(page, KM_USER0);
if (block_start < from) {
memset(kaddr+block_start, 0, from-block_start);
@@ -2433,7 +2433,7 @@ int nobh_prepare_write(struct page *page
kunmap_atomic(kaddr, KM_USER0);
continue;
}
- if (buffer_uptodate(&map_bh))
+ if (buffer_uptodate(&bh_map))
continue; /* reiserfs does this */
if (block_start < from || block_end > to) {
struct buffer_head *bh = alloc_buffer_head(GFP_NOFS);
@@ -2442,14 +2442,14 @@ int nobh_prepare_write(struct page *page
ret = -ENOMEM;
goto failed;
}
- bh->b_state = map_bh.b_state;
+ bh->b_state = bh_map.b_state;
atomic_set(&bh->b_count, 0);
bh->b_this_page = NULL;
bh->b_page = page;
- bh->b_blocknr = map_bh.b_blocknr;
+ bh->b_blocknr = bh_map.b_blocknr;
bh->b_size = blocksize;
bh->b_data = (char *)(long)block_start;
- bh->b_bdev = map_bh.b_bdev;
+ bh->b_bdev = bh_map.b_bdev;
bh->b_private = NULL;
read_bh[nr_reads++] = bh;
}
--- linux-2.6.18-rc1-orig/fs/mpage.c 2006-07-06 19:39:47.000000000 +0200
+++ linux-2.6.18-rc1/fs/mpage.c 2006-07-09 20:54:33.000000000 +0200
@@ -174,7 +174,7 @@ map_buffer_to_page(struct page *page, st
*/
static struct bio *
do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages,
- sector_t *last_block_in_bio, struct buffer_head *map_bh,
+ sector_t *last_block_in_bio, struct buffer_head *bh_map,
unsigned long *first_logical_block, get_block_t get_block)
{
struct inode *inode = page->mapping->host;
@@ -206,49 +206,49 @@ do_mpage_readpage(struct bio *bio, struc
/*
* Map blocks using the result from the previous get_blocks call first.
*/
- nblocks = map_bh->b_size >> blkbits;
- if (buffer_mapped(map_bh) && block_in_file > *first_logical_block &&
+ nblocks = bh_map->b_size >> blkbits;
+ if (buffer_mapped(bh_map) && block_in_file > *first_logical_block &&
block_in_file < (*first_logical_block + nblocks)) {
unsigned map_offset = block_in_file - *first_logical_block;
unsigned last = nblocks - map_offset;
for (relative_block = 0; ; relative_block++) {
if (relative_block == last) {
- clear_buffer_mapped(map_bh);
+ clear_buffer_mapped(bh_map);
break;
}
if (page_block == blocks_per_page)
break;
- blocks[page_block] = map_bh->b_blocknr + map_offset +
+ blocks[page_block] = bh_map->b_blocknr + map_offset +
relative_block;
page_block++;
block_in_file++;
}
- bdev = map_bh->b_bdev;
+ bdev = bh_map->b_bdev;
}
/*
* Then do more get_blocks calls until we are done with this page.
*/
- map_bh->b_page = page;
+ bh_map->b_page = page;
while (page_block < blocks_per_page) {
- map_bh->b_state = 0;
- map_bh->b_size = 0;
+ bh_map->b_state = 0;
+ bh_map->b_size = 0;
if (block_in_file < last_block) {
- map_bh->b_size = (last_block-block_in_file) << blkbits;
- if (get_block(inode, block_in_file, map_bh, 0))
+ bh_map->b_size = (last_block-block_in_file) << blkbits;
+ if (get_block(inode, block_in_file, bh_map, 0))
goto confused;
*first_logical_block = block_in_file;
}
- if (!buffer_mapped(map_bh)) {
+ if (!buffer_mapped(bh_map)) {
fully_mapped = 0;
if (first_hole == blocks_per_page)
first_hole = page_block;
page_block++;
block_in_file++;
- clear_buffer_mapped(map_bh);
+ clear_buffer_mapped(bh_map);
continue;
}
@@ -258,8 +258,8 @@ do_mpage_readpage(struct bio *bio, struc
* we just collected from get_block into the page's buffers
* so readpage doesn't have to repeat the get_block call
*/
- if (buffer_uptodate(map_bh)) {
- map_buffer_to_page(page, map_bh, page_block);
+ if (buffer_uptodate(bh_map)) {
+ map_buffer_to_page(page, bh_map, page_block);
goto confused;
}
@@ -267,20 +267,20 @@ do_mpage_readpage(struct bio *bio, struc
goto confused; /* hole -> non-hole */
/* Contiguous blocks? */
- if (page_block && blocks[page_block-1] != map_bh->b_blocknr-1)
+ if (page_block && blocks[page_block-1] != bh_map->b_blocknr-1)
goto confused;
- nblocks = map_bh->b_size >> blkbits;
+ nblocks = bh_map->b_size >> blkbits;
for (relative_block = 0; ; relative_block++) {
if (relative_block == nblocks) {
- clear_buffer_mapped(map_bh);
+ clear_buffer_mapped(bh_map);
break;
} else if (page_block == blocks_per_page)
break;
- blocks[page_block] = map_bh->b_blocknr+relative_block;
+ blocks[page_block] = bh_map->b_blocknr+relative_block;
page_block++;
block_in_file++;
}
- bdev = map_bh->b_bdev;
+ bdev = bh_map->b_bdev;
}
if (first_hole != blocks_per_page) {
@@ -319,7 +319,7 @@ alloc_new:
goto alloc_new;
}
- if (buffer_boundary(map_bh) || (first_hole != blocks_per_page))
+ if (buffer_boundary(bh_map) || (first_hole != blocks_per_page))
bio = mpage_bio_submit(READ, bio);
else
*last_block_in_bio = blocks[blocks_per_page - 1];
@@ -390,10 +390,10 @@ mpage_readpages(struct address_space *ma
unsigned page_idx;
sector_t last_block_in_bio = 0;
struct pagevec lru_pvec;
- struct buffer_head map_bh;
+ struct buffer_head bh_map;
unsigned long first_logical_block = 0;
- clear_buffer_mapped(&map_bh);
+ clear_buffer_mapped(&bh_map);
pagevec_init(&lru_pvec, 0);
for (page_idx = 0; page_idx < nr_pages; page_idx++) {
struct page *page = list_entry(pages->prev, struct page, lru);
@@ -404,7 +404,7 @@ mpage_readpages(struct address_space *ma
page->index, GFP_KERNEL)) {
bio = do_mpage_readpage(bio, page,
nr_pages - page_idx,
- &last_block_in_bio, &map_bh,
+ &last_block_in_bio, &bh_map,
&first_logical_block,
get_block);
if (!pagevec_add(&lru_pvec, page))
@@ -428,12 +428,12 @@ int mpage_readpage(struct page *page, ge
{
struct bio *bio = NULL;
sector_t last_block_in_bio = 0;
- struct buffer_head map_bh;
+ struct buffer_head bh_map;
unsigned long first_logical_block = 0;
- clear_buffer_mapped(&map_bh);
+ clear_buffer_mapped(&bh_map);
bio = do_mpage_readpage(bio, page, 1, &last_block_in_bio,
- &map_bh, &first_logical_block, get_block);
+ &bh_map, &first_logical_block, get_block);
if (bio)
mpage_bio_submit(READ, bio);
return 0;
@@ -476,7 +476,7 @@ __mpage_writepage(struct bio *bio, struc
sector_t boundary_block = 0;
struct block_device *boundary_bdev = NULL;
int length;
- struct buffer_head map_bh;
+ struct buffer_head bh_map;
loff_t i_size = i_size_read(inode);
if (page_has_buffers(page)) {
@@ -535,27 +535,27 @@ __mpage_writepage(struct bio *bio, struc
BUG_ON(!PageUptodate(page));
block_in_file = (sector_t)page->index << (PAGE_CACHE_SHIFT - blkbits);
last_block = (i_size - 1) >> blkbits;
- map_bh.b_page = page;
+ bh_map.b_page = page;
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))
+ bh_map.b_state = 0;
+ bh_map.b_size = 1 << blkbits;
+ if (get_block(inode, block_in_file, &bh_map, 1))
goto confused;
- if (buffer_new(&map_bh))
- unmap_underlying_metadata(map_bh.b_bdev,
- map_bh.b_blocknr);
- if (buffer_boundary(&map_bh)) {
- boundary_block = map_bh.b_blocknr;
- boundary_bdev = map_bh.b_bdev;
+ if (buffer_new(&bh_map))
+ unmap_underlying_metadata(bh_map.b_bdev,
+ bh_map.b_blocknr);
+ if (buffer_boundary(&bh_map)) {
+ boundary_block = bh_map.b_blocknr;
+ boundary_bdev = bh_map.b_bdev;
}
if (page_block) {
- if (map_bh.b_blocknr != blocks[page_block-1] + 1)
+ if (bh_map.b_blocknr != blocks[page_block-1] + 1)
goto confused;
}
- blocks[page_block++] = map_bh.b_blocknr;
- boundary = buffer_boundary(&map_bh);
- bdev = map_bh.b_bdev;
+ blocks[page_block++] = bh_map.b_blocknr;
+ boundary = buffer_boundary(&bh_map);
+ bdev = bh_map.b_bdev;
if (block_in_file == last_block)
break;
block_in_file++;
--- linux-2.6.18-rc1-orig/fs/direct-io.c 2006-07-06 19:39:47.000000000 +0200
+++ linux-2.6.18-rc1/fs/direct-io.c 2006-07-09 20:57:53.000000000 +0200
@@ -512,7 +512,7 @@ static int dio_bio_reap(struct dio *dio)
static int get_more_blocks(struct dio *dio)
{
int ret;
- struct buffer_head *map_bh = &dio->map_bh;
+ struct buffer_head *bh_map = &dio->map_bh;
sector_t fs_startblk; /* Into file, in filesystem-sized blocks */
unsigned long fs_count; /* Number of filesystem-sized blocks */
unsigned long dio_count;/* Number of dio_block-sized blocks */
@@ -533,8 +533,8 @@ static int get_more_blocks(struct dio *d
if (dio_count & blkmask)
fs_count++;
- map_bh->b_state = 0;
- map_bh->b_size = fs_count << dio->inode->i_blkbits;
+ bh_map->b_state = 0;
+ bh_map->b_size = fs_count << dio->inode->i_blkbits;
create = dio->rw & WRITE;
if (dio->lock_type == DIO_LOCKING) {
@@ -552,7 +552,7 @@ static int get_more_blocks(struct dio *d
* writes.
*/
ret = (*dio->get_block)(dio->inode, fs_startblk,
- map_bh, create);
+ bh_map, create);
}
return ret;
}
@@ -799,7 +799,7 @@ static int do_direct_IO(struct dio *dio)
const unsigned blocks_per_page = PAGE_SIZE >> blkbits;
struct page *page;
unsigned block_in_page;
- struct buffer_head *map_bh = &dio->map_bh;
+ struct buffer_head *bh_map = &dio->map_bh;
int ret = 0;
/* The I/O can start at any block offset within the first page */
@@ -830,14 +830,14 @@ static int do_direct_IO(struct dio *dio)
page_cache_release(page);
goto out;
}
- if (!buffer_mapped(map_bh))
+ if (!buffer_mapped(bh_map))
goto do_holes;
dio->blocks_available =
- map_bh->b_size >> dio->blkbits;
+ bh_map->b_size >> dio->blkbits;
dio->next_block_for_io =
- map_bh->b_blocknr << dio->blkfactor;
- if (buffer_new(map_bh))
+ bh_map->b_blocknr << dio->blkfactor;
+ if (buffer_new(bh_map))
clean_blockdev_aliases(dio);
if (!dio->blkfactor)
@@ -857,13 +857,13 @@ static int do_direct_IO(struct dio *dio)
* the start of the fs block must be zeroed out
* on-disk
*/
- if (!buffer_new(map_bh))
+ if (!buffer_new(bh_map))
dio->next_block_for_io += dio_remainder;
dio->blocks_available -= dio_remainder;
}
do_holes:
/* Handle holes */
- if (!buffer_mapped(map_bh)) {
+ if (!buffer_mapped(bh_map)) {
char *kaddr;
loff_t i_size_aligned;
@@ -917,7 +917,7 @@ do_holes:
this_chunk_bytes = this_chunk_blocks << blkbits;
BUG_ON(this_chunk_bytes == 0);
- dio->boundary = buffer_boundary(map_bh);
+ dio->boundary = buffer_boundary(bh_map);
ret = submit_page_section(dio, page, offset_in_page,
this_chunk_bytes, dio->next_block_for_io);
if (ret) {
-
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