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fs: Add helper to clean bdev aliases under a bh and use it

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Add a helper function that clears buffer heads from a block device
aliasing passed bh. Use this helper function from filesystems instead of
the original unmap_underlying_metadata() to save some boiler plate code
and also have a better name for the functionalily since it is not
unmapping anything for a *long* time.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jan Kara 2016-11-04 18:08:15 +01:00 committed by Jens Axboe
parent 69a9bea146
commit e64855c6cf
10 changed files with 16 additions and 19 deletions
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8
fs/buffer.c
View File

@ -1821,8 +1821,7 @@ int __block_write_full_page(struct inode *inode, struct page *page,
if (buffer_new(bh)) {
/* blockdev mappings never come here */
clear_buffer_new(bh);
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
clean_bdev_bh_alias(bh);
}
}
bh = bh->b_this_page;
@ -2068,8 +2067,7 @@ int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
}
if (buffer_new(bh)) {
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
clean_bdev_bh_alias(bh);
if (PageUptodate(page)) {
clear_buffer_new(bh);
set_buffer_uptodate(bh);
@ -2709,7 +2707,7 @@ int nobh_write_begin(struct address_space *mapping,
if (!buffer_mapped(bh))
is_mapped_to_disk = 0;
if (buffer_new(bh))
unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
clean_bdev_bh_alias(bh);
if (PageUptodate(page)) {
set_buffer_uptodate(bh);
continue;

3
fs/ext4/inode.c
View File

@ -1123,8 +1123,7 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
if (err)
break;
if (buffer_new(bh)) {
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
clean_bdev_bh_alias(bh);
if (PageUptodate(page)) {
clear_buffer_new(bh);
set_buffer_uptodate(bh);

2
fs/ext4/page-io.c
View File

@ -457,7 +457,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
}
if (buffer_new(bh)) {
clear_buffer_new(bh);
unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
clean_bdev_bh_alias(bh);
}
set_buffer_async_write(bh);
nr_to_submit++;

3
fs/mpage.c
View File

@ -555,8 +555,7 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
if (mpd->get_block(inode, block_in_file, &map_bh, 1))
goto confused;
if (buffer_new(&map_bh))
unmap_underlying_metadata(map_bh.b_bdev,
map_bh.b_blocknr);
clean_bdev_bh_alias(&map_bh);
if (buffer_boundary(&map_bh)) {
boundary_block = map_bh.b_blocknr;
boundary_bdev = map_bh.b_bdev;

2
fs/ntfs/aops.c
View File

@ -765,7 +765,7 @@ static int ntfs_write_block(struct page *page, struct writeback_control *wbc)
}
// TODO: Instantiate the hole.
// clear_buffer_new(bh);
// unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
// clean_bdev_bh_alias(bh);
ntfs_error(vol->sb, "Writing into sparse regions is "
"not supported yet. Sorry.");
err = -EOPNOTSUPP;

5
fs/ntfs/file.c
View File

@ -740,8 +740,7 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
set_buffer_uptodate(bh);
if (unlikely(was_hole)) {
/* We allocated the buffer. */
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
clean_bdev_bh_alias(bh);
if (bh_end <= pos || bh_pos >= end)
mark_buffer_dirty(bh);
else
@ -784,7 +783,7 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
continue;
}
/* We allocated the buffer. */
unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
clean_bdev_bh_alias(bh);
/*
* If the buffer is fully outside the write, zero it,
* set it uptodate, and mark it dirty so it gets

2
fs/ocfs2/aops.c
View File

@ -630,7 +630,7 @@ int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
if (!buffer_mapped(bh)) {
map_bh(bh, inode->i_sb, *p_blkno);
unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
clean_bdev_bh_alias(bh);
}
if (PageUptodate(page)) {

3
fs/ufs/balloc.c
View File

@ -307,8 +307,7 @@ static void ufs_change_blocknr(struct inode *inode, sector_t beg,
(unsigned long long)(pos + newb), pos);
bh->b_blocknr = newb + pos;
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
clean_bdev_bh_alias(bh);
mark_buffer_dirty(bh);
++j;
bh = bh->b_this_page;

3
fs/ufs/inode.c
View File

@ -1070,8 +1070,7 @@ static int ufs_alloc_lastblock(struct inode *inode, loff_t size)
if (buffer_new(bh)) {
clear_buffer_new(bh);
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
clean_bdev_bh_alias(bh);
/*
* we do not zeroize fragment, because of
* if it maped to hole, it already contains zeroes

4
include/linux/buffer_head.h
View File

@ -171,6 +171,10 @@ int sync_mapping_buffers(struct address_space *mapping);
void unmap_underlying_metadata(struct block_device *bdev, sector_t block);
void clean_bdev_aliases(struct block_device *bdev, sector_t block,
sector_t len);
static inline void clean_bdev_bh_alias(struct buffer_head *bh)
{
clean_bdev_aliases(bh->b_bdev, bh->b_blocknr, 1);
}
void mark_buffer_async_write(struct buffer_head *bh);
void __wait_on_buffer(struct buffer_head *);