diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/buffer.c | 32 |
1 files changed, 0 insertions, 32 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 912d70169fca..1104ce8b4536 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -1605,38 +1605,6 @@ void create_empty_buffers(struct page *page, } EXPORT_SYMBOL(create_empty_buffers); -/* - * We are taking a block for data and we don't want any output from any - * buffer-cache aliases starting from return from that function and - * until the moment when something will explicitly mark the buffer - * dirty (hopefully that will not happen until we will free that block ;-) - * We don't even need to mark it not-uptodate - nobody can expect - * anything from a newly allocated buffer anyway. We used to used - * unmap_buffer() for such invalidation, but that was wrong. We definitely - * don't want to mark the alias unmapped, for example - it would confuse - * anyone who might pick it with bread() afterwards... - * - * Also.. Note that bforget() doesn't lock the buffer. So there can - * be writeout I/O going on against recently-freed buffers. We don't - * wait on that I/O in bforget() - it's more efficient to wait on the I/O - * only if we really need to. That happens here. - */ -void unmap_underlying_metadata(struct block_device *bdev, sector_t block) -{ - struct buffer_head *old_bh; - - might_sleep(); - - old_bh = __find_get_block_slow(bdev, block); - if (old_bh) { - clear_buffer_dirty(old_bh); - wait_on_buffer(old_bh); - clear_buffer_req(old_bh); - __brelse(old_bh); - } -} -EXPORT_SYMBOL(unmap_underlying_metadata); - /** * clean_bdev_aliases: clean a range of buffers in block device * @bdev: Block device to clean buffers in |