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Revert "mm/filemap: avoid buffered read/write race to read inconsistent data" 

This reverts commit e2c27b803b ("mm/filemap: avoid buffered read/write
race to read inconsistent data"). After making the i_size_read/write
helpers be smp_load_acquire/store_release(), it is already guaranteed that
changes to page contents are visible before we see increased inode size,
so the extra smp_rmb() in filemap_read() can be removed.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Link: https://lore.kernel.org/r/20240124142857.4146716-3-libaokun1@huawei.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Baokun Li 2024-01-24 22:28:56 +08:00 committed by Christian Brauner
parent d8f899d13d
commit 4b944f8ef9
1 changed files with 0 additions and 9 deletions
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9
mm/filemap.c
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@ -2608,15 +2608,6 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,
goto put_folios;
end_offset = min_t(loff_t, isize, iocb->ki_pos + iter->count);
/*
* Pairs with a barrier in
* block_write_end()->mark_buffer_dirty() or other page
* dirtying routines like iomap_write_end() to ensure
* changes to page contents are visible before we see
* increased inode size.
*/
smp_rmb();
/*
* Once we start copying data, we don't want to be touching any
* cachelines that might be contended: