From: Lukas Czerner Subject: [PATCH 02/12 v2] Revert "ext4: fix fsx truncate failure" Date: Fri, 13 Jul 2012 15:19:05 +0200 Message-ID: <1342185555-21146-2-git-send-email-lczerner@redhat.com> References: <1342185555-21146-1-git-send-email-lczerner@redhat.com> Cc: linux-fsdevel@vger.kernel.org, tytso@mit.edu, achender@linux.vnet.ibm.com, Lukas Czerner To: linux-ext4@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:27482 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1162559Ab2GMNT0 (ORCPT ); Fri, 13 Jul 2012 09:19:26 -0400 In-Reply-To: <1342185555-21146-1-git-send-email-lczerner@redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: This reverts commit 189e868fa8fdca702eb9db9d8afc46b5cb9144c9. 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. This was tested on ppc64 machine with block size of 1024 bytes without any problems. Signed-off-by: Lukas Czerner --- fs/ext4/extents.c | 13 ++----------- fs/ext4/indirect.c | 13 ++----------- 2 files changed, 4 insertions(+), 22 deletions(-) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 91341ec..ceab5f5 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4222,7 +4222,6 @@ void ext4_ext_truncate(struct inode *inode) struct super_block *sb = inode->i_sb; ext4_lblk_t last_block; handle_t *handle; - loff_t page_len; int err = 0; /* @@ -4239,16 +4238,8 @@ void ext4_ext_truncate(struct inode *inode) if (IS_ERR(handle)) return; - if (inode->i_size % PAGE_CACHE_SIZE != 0) { - page_len = PAGE_CACHE_SIZE - - (inode->i_size & (PAGE_CACHE_SIZE - 1)); - - err = ext4_discard_partial_page_buffers(handle, - mapping, inode->i_size, page_len, 0); - - if (err) - goto out_stop; - } + if (inode->i_size & (sb->s_blocksize - 1)) + ext4_block_truncate_page(handle, mapping, inode->i_size); if (ext4_orphan_add(handle, inode)) goto out_stop; diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c index 830e1b2..a082b30 100644 --- a/fs/ext4/indirect.c +++ b/fs/ext4/indirect.c @@ -1349,9 +1349,7 @@ void ext4_ind_truncate(struct inode *inode) __le32 nr = 0; int n = 0; ext4_lblk_t last_block, max_block; - loff_t page_len; unsigned blocksize = inode->i_sb->s_blocksize; - int err; handle = start_transaction(inode); if (IS_ERR(handle)) @@ -1362,16 +1360,9 @@ void ext4_ind_truncate(struct inode *inode) max_block = (EXT4_SB(inode->i_sb)->s_bitmap_maxbytes + blocksize-1) >> EXT4_BLOCK_SIZE_BITS(inode->i_sb); - if (inode->i_size % PAGE_CACHE_SIZE != 0) { - page_len = PAGE_CACHE_SIZE - - (inode->i_size & (PAGE_CACHE_SIZE - 1)); - - err = ext4_discard_partial_page_buffers(handle, - mapping, inode->i_size, page_len, 0);