From: "Kirill A. Shutemov" Subject: [PATCHv5 32/36] ext4: make EXT4_IOC_MOVE_EXT work with huge pages Date: Tue, 29 Nov 2016 14:23:00 +0300 Message-ID: <20161129112304.90056-33-kirill.shutemov@linux.intel.com> References: <20161129112304.90056-1-kirill.shutemov@linux.intel.com> Cc: Alexander Viro , Hugh Dickins , Andrea Arcangeli , Dave Hansen , Vlastimil Babka , Matthew Wilcox , Ross Zwisler , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org, "Kirill A. Shutemov" To: "Theodore Ts'o" , Andreas Dilger , Jan Kara , Andrew Morton Return-path: In-Reply-To: <20161129112304.90056-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-Id: linux-ext4.vger.kernel.org Adjust how we find relevant block within page and how we clear the required part of the page. Signed-off-by: Kirill A. Shutemov --- fs/ext4/move_extent.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c index 6fc14def0c70..2efa9deb47a9 100644 --- a/fs/ext4/move_extent.c +++ b/fs/ext4/move_extent.c @@ -210,7 +210,9 @@ mext_page_mkuptodate(struct page *page, unsigned from, unsigned to) return err; } if (!buffer_mapped(bh)) { - zero_user(page, block_start, blocksize); + zero_user(page + block_start / PAGE_SIZE, + block_start % PAGE_SIZE, + blocksize); set_buffer_uptodate(bh); continue; } @@ -267,10 +269,11 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode, unsigned int tmp_data_size, data_size, replaced_size; int i, err2, jblocks, retries = 0; int replaced_count = 0; - int from = data_offset_in_page << orig_inode->i_blkbits; + int from; int blocks_per_page = PAGE_SIZE >> orig_inode->i_blkbits; struct super_block *sb = orig_inode->i_sb; struct buffer_head *bh = NULL; + int diff; /* * It needs twice the amount of ordinary journal buffers because @@ -355,6 +358,9 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode, goto unlock_pages; } data_copy: + diff = (pagep[0] - compound_head(pagep[0])) * blocks_per_page; + from = (data_offset_in_page + diff) << orig_inode->i_blkbits; + pagep[0] = compound_head(pagep[0]); *err = mext_page_mkuptodate(pagep[0], from, from + replaced_size); if (*err) goto unlock_pages; @@ -384,7 +390,7 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode, if (!page_has_buffers(pagep[0])) create_empty_buffers(pagep[0], 1 << orig_inode->i_blkbits, 0); bh = page_buffers(pagep[0]); - for (i = 0; i < data_offset_in_page; i++) + for (i = 0; i < data_offset_in_page + diff; i++) bh = bh->b_this_page; for (i = 0; i < block_len_in_page; i++) { *err = ext4_get_block(orig_inode, orig_blk_offset + i, bh, 0); -- 2.10.2 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org