linux-kernel - [PATCHv3 34/41] ext4: handle huge pages in ext4_da_write

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Message-Id: <20160915115523.29737-35-kirill.shutemov@linux.intel.com>
Date:   Thu, 15 Sep 2016 14:55:16 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jan Kara <jack@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Hugh Dickins <hughd@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-block@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv3 34/41] ext4: handle huge pages in ext4_da_write_end()

Call ext4_da_should_update_i_disksize() for head page with offset
relative to head page.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 fs/ext4/inode.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 31560b52eff2..deacd3499ec7 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3006,7 +3006,6 @@ static int ext4_da_write_end(struct file *file,
 	int ret = 0, ret2;
 	handle_t *handle = ext4_journal_current_handle();
 	loff_t new_i_size;
-	unsigned long start, end;
 	int write_mode = (int)(unsigned long)fsdata;
 
 	if (write_mode == FALL_BACK_TO_NONDELALLOC)
@@ -3014,8 +3013,6 @@ static int ext4_da_write_end(struct file *file,
 				      len, copied, page, fsdata);
 
 	trace_ext4_da_write_end(inode, pos, len, copied);
-	start = pos & (PAGE_SIZE - 1);
-	end = start + copied - 1;
 
 	/*
 	 * generic_write_end() will run mark_inode_dirty() if i_size
@@ -3024,8 +3021,10 @@ static int ext4_da_write_end(struct file *file,
 	 */
 	new_i_size = pos + copied;
 	if (copied && new_i_size > EXT4_I(inode)->i_disksize) {
+		struct page *head = compound_head(page);
+		unsigned long end = (pos & ~hpage_mask(head)) + copied - 1;
 		if (ext4_has_inline_data(inode) ||
-		    ext4_da_should_update_i_disksize(page, end)) {
+		    ext4_da_should_update_i_disksize(head, end)) {
 			ext4_update_i_disksize(inode, new_i_size);
 			/* We need to mark inode dirty even if
 			 * new_i_size is less that inode->i_size
-- 
2.9.3