linux-ext4 - [PATCH 13/31] ext4: Convert ext4_da_write_inline_data

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 26 Jan 2023 20:23:57 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     "Theodore Tso" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 13/31] ext4: Convert ext4_da_write_inline_data_begin() to use a folio

Saves a number of calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 fs/ext4/inline.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 99c77dd519f0..b8e22348dad2 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -910,10 +910,9 @@ int ext4_da_write_inline_data_begin(struct address_space *mapping,
 {
 	int ret;
 	handle_t *handle;
-	struct page *page;
+	struct folio *folio;
 	struct ext4_iloc iloc;
 	int retries = 0;
-	unsigned int flags;
 
 	ret = ext4_get_inode_loc(inode, &iloc);
 	if (ret)
@@ -945,10 +944,9 @@ int ext4_da_write_inline_data_begin(struct address_space *mapping,
 	 * We cannot recurse into the filesystem as the transaction
 	 * is already started.
 	 */
-	flags = memalloc_nofs_save();
-	page = grab_cache_page_write_begin(mapping, 0);
-	memalloc_nofs_restore(flags);
-	if (!page) {
+	folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
+					mapping_gfp_mask(mapping));
+	if (!folio) {
 		ret = -ENOMEM;
 		goto out_journal;
 	}
@@ -959,8 +957,8 @@ int ext4_da_write_inline_data_begin(struct address_space *mapping,
 		goto out_release_page;
 	}
 
-	if (!PageUptodate(page)) {
-		ret = ext4_read_inline_page(inode, page);
+	if (!folio_test_uptodate(folio)) {
+		ret = ext4_read_inline_page(inode, &folio->page);
 		if (ret < 0)
 			goto out_release_page;
 	}
@@ -970,13 +968,13 @@ int ext4_da_write_inline_data_begin(struct address_space *mapping,
 		goto out_release_page;
 
 	up_read(&EXT4_I(inode)->xattr_sem);
-	*pagep = page;
+	*pagep = &folio->page;
 	brelse(iloc.bh);
 	return 1;
 out_release_page:
 	up_read(&EXT4_I(inode)->xattr_sem);
-	unlock_page(page);
-	put_page(page);
+	folio_unlock(folio);
+	folio_put(folio);
 out_journal:
 	ext4_journal_stop(handle);
 out:
-- 
2.35.1