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authorJan Kara <jack@suse.cz>2016-11-04 18:08:16 +0100
committerJens Axboe <axboe@fb.com>2016-11-04 14:34:47 -0600
commitce98321bf7d274a470642ef99e1d82512673ce7c (patch)
treeb38ed4addc703bb68669c774275c4c4d4afa9be4 /fs
parente64855c6cfaa0a80c1b71c5f647cb792dc436668 (diff)
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fs: Remove unmap_underlying_metadata
Nobody is using this function anymore. Remove it. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/buffer.c32
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