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Revert "ext4: fix fsx truncate failure" 

This reverts commit 189e868fa8.

This commit reintroduces the use of ext4_block_truncate_page() in ext4
truncate operation instead of ext4_discard_partial_page_buffers().

The statement in the commit description that the truncate operation only
zero block unaligned portion of the last page is not exactly right,
since truncate_pagecache_range() also zeroes and invalidate the unaligned
portion of the page. Then there is no need to zero and unmap it once more
and ext4_block_truncate_page() was doing the right job, although we
still need to update the buffer head containing the last block, which is
exactly what ext4_block_truncate_page() is doing.

Moreover the problem described in the commit is fixed more properly with
commit

15291164b2
	jbd2: clear BH_Delay & BH_Unwritten in journal_unmap_buffer

This was tested on ppc64 machine with block size of 1024 bytes without
any problems.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Lukas Czerner 2013-05-27 23:32:35 -04:00 committed by Theodore Ts'o
parent 0713ed0cde
commit eb3544c6fc
1 changed files with 2 additions and 9 deletions
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11
fs/ext4/inode.c
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@ -3938,7 +3938,6 @@ void ext4_truncate(struct inode *inode)
unsigned int credits;
handle_t *handle;
struct address_space *mapping = inode->i_mapping;
loff_t page_len;
/*
* There is a possibility that we're either freeing the inode
@ -3982,14 +3981,8 @@ void ext4_truncate(struct inode *inode)
return;
}
if (inode->i_size % PAGE_CACHE_SIZE != 0) {
page_len = PAGE_CACHE_SIZE -
(inode->i_size & (PAGE_CACHE_SIZE - 1));
if (ext4_discard_partial_page_buffers(handle,
mapping, inode->i_size, page_len, 0))
goto out_stop;
}
if (inode->i_size & (inode->i_sb->s_blocksize - 1))
ext4_block_truncate_page(handle, mapping, inode->i_size);
/*
* We add the inode to the orphan list, so that if this