linux-kernel - [PATCHv4 40/43] ext4: fix SEEK_DATA/SEEK

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Date:   Tue, 25 Oct 2016 03:13:39 +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: [PATCHv4 40/43] ext4: fix SEEK_DATA/SEEK_HOLE for huge pages

ext4_find_unwritten_pgoff() needs few tweaks to work with huge pages.
Mostly trivial page_mapping()/page_to_pgoff() and adjustment to how we
find relevant block.

Signe-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 fs/ext4/file.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 2a822d30e73f..8b70c1660342 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -467,7 +467,7 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
 			 * range, it will be a hole.
 			 */
 			if (lastoff < endoff && whence == SEEK_HOLE &&
-			    page->index > end) {
+			    page_to_pgoff(page) > end) {
 				found = 1;
 				*offset = lastoff;
 				goto out;
@@ -475,7 +475,7 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
 
 			lock_page(page);
 
-			if (unlikely(page->mapping != inode->i_mapping)) {
+			if (unlikely(page_mapping(page) != inode->i_mapping)) {
 				unlock_page(page);
 				continue;
 			}
@@ -486,8 +486,12 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
 			}
 
 			if (page_has_buffers(page)) {
+				int diff;
 				lastoff = page_offset(page);
 				bh = head = page_buffers(page);
+				diff = (page - compound_head(page)) << inode->i_blkbits;
+				while (diff--)
+					bh = bh->b_this_page;
 				do {
 					if (buffer_uptodate(bh) ||
 					    buffer_unwritten(bh)) {
@@ -508,8 +512,12 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
 				} while (bh != head);
 			}
 
-			lastoff = page_offset(page) + PAGE_SIZE;
+			lastoff = page_offset(page) + hpage_size(page);
 			unlock_page(page);
+			if (PageTransCompound(page)) {
+				i++;
+				break;
+			}
 		}
 
 		/*
@@ -522,7 +530,9 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
 			break;
 		}
 
-		index = pvec.pages[i - 1]->index + 1;
+		index = page_to_pgoff(pvec.pages[i - 1]) + 1;
+		if (PageTransCompound(pvec.pages[i - 1]))
+			index = round_up(index, HPAGE_PMD_NR);
 		pagevec_release(&pvec);
 	} while (index <= end);
 
-- 
2.9.3