From: Tao Ma Subject: [PATCH V1 05/17] ext4: Add journalled write support for inline data. Date: Wed, 26 Oct 2011 15:34:16 +0800 Message-ID: <1319614468-11227-5-git-send-email-tm@tao.ma> References: <4EA7B788.3040503@tao.ma> <1319614468-11227-1-git-send-email-tm@tao.ma> Cc: tytso@mit.edu, linux-kernel@vger.kernel.org, adilger@dilger.ca To: linux-ext4@vger.kernel.org Return-path: In-Reply-To: <1319614468-11227-1-git-send-email-tm@tao.ma> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org From: Tao Ma Signed-off-by: Tao Ma --- fs/ext4/inode.c | 81 ++++++++++++++++++++++++++++++++++++++++++------------ 1 files changed, 63 insertions(+), 18 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 876cdfd..bbd4b3c 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1196,16 +1196,21 @@ static int ext4_journalled_write_end(struct file *file, BUG_ON(!ext4_handle_valid(handle)); - if (copied < len) { - if (!PageUptodate(page)) - copied = 0; - page_zero_new_buffers(page, from+copied, to); - } + if (ext4_has_inline_data(inode)) + copied = ext4_write_inline_data_end(inode, pos, len, + copied, page); + else { + if (copied < len) { + if (!PageUptodate(page)) + copied = 0; + page_zero_new_buffers(page, from+copied, to); + } - ret = walk_page_buffers(handle, page_buffers(page), from, - to, &partial, write_end_fn); - if (!partial) - SetPageUptodate(page); + ret = walk_page_buffers(handle, page_buffers(page), from, + to, &partial, write_end_fn); + if (!partial) + SetPageUptodate(page); + } new_i_size = pos + copied; if (new_i_size > inode->i_size) i_size_write(inode, pos+copied); @@ -1893,20 +1898,50 @@ static int bput_one(handle_t *handle, struct buffer_head *bh) return 0; } +static struct buffer_head * +ext4_journalled_write_inline_data(struct inode *inode, + unsigned len, + struct page *page) +{ + int ret; + void *kaddr; + struct ext4_iloc iloc; + + ret = ext4_get_inode_loc(inode, &iloc); + if (ret) { + ext4_std_error(inode->i_sb, ret); + return NULL; + } + + kaddr = kmap_atomic(page, KM_USER0); + ext4_write_inline_data(inode, &iloc, kaddr, 0, len); + kunmap_atomic(kaddr, KM_USER0); + + return iloc.bh; +} + static int __ext4_journalled_writepage(struct page *page, unsigned int len) { struct address_space *mapping = page->mapping; struct inode *inode = mapping->host; - struct buffer_head *page_bufs; + struct buffer_head *page_bufs = NULL; handle_t *handle = NULL; int ret = 0; int err; + struct buffer_head *inode_bh = NULL; ClearPageChecked(page); - page_bufs = page_buffers(page); - BUG_ON(!page_bufs); - walk_page_buffers(handle, page_bufs, 0, len, NULL, bget_one); + + if (ext4_has_inline_data(inode)) { + BUG_ON(page->index != 0); + BUG_ON(len > ext4_get_max_inline_size(inode)); + inode_bh = ext4_journalled_write_inline_data(inode, len, page); + } else { + page_bufs = page_buffers(page); + BUG_ON(!page_bufs); + walk_page_buffers(handle, page_bufs, 0, len, NULL, bget_one); + } /* As soon as we unlock the page, it can go away, but we have * references to buffers so we are safe */ unlock_page(page); @@ -1919,11 +1954,19 @@ static int __ext4_journalled_writepage(struct page *page, BUG_ON(!ext4_handle_valid(handle)); - ret = walk_page_buffers(handle, page_bufs, 0, len, NULL, - do_journal_get_write_access); + if (ext4_has_inline_data(inode) && inode_bh) { + ret = ext4_journal_get_write_access(handle, inode_bh); + + err = ext4_handle_dirty_metadata(handle, inode, inode_bh); + + } else { + ret = walk_page_buffers(handle, page_bufs, 0, len, NULL, + do_journal_get_write_access); + + err = walk_page_buffers(handle, page_bufs, 0, len, NULL, + write_end_fn); + } - err = walk_page_buffers(handle, page_bufs, 0, len, NULL, - write_end_fn); if (ret == 0) ret = err; EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid; @@ -1931,9 +1974,11 @@ static int __ext4_journalled_writepage(struct page *page, if (!ret) ret = err; - walk_page_buffers(handle, page_bufs, 0, len, NULL, bput_one); + if (!ext4_has_inline_data(inode)) + walk_page_buffers(handle, page_bufs, 0, len, NULL, bput_one); ext4_set_inode_state(inode, EXT4_STATE_JDATA); out: + brelse(inode_bh); return ret; } -- 1.7.0.4