linux-ext4 - [PATCH 10/12] fuse: update ki_pos in fuse_perform

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]

Message-Id: <20230531075026.480237-11-hch@lst.de>
Date:   Wed, 31 May 2023 09:50:24 +0200
From:   Christoph Hellwig <hch@....de>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Jens Axboe <axboe@...nel.dk>, Xiubo Li <xiubli@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        "Theodore Ts'o" <tytso@....edu>, Jaegeuk Kim <jaegeuk@...nel.org>,
        Chao Yu <chao@...nel.org>, Miklos Szeredi <miklos@...redi.hu>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Damien Le Moal <dlemoal@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-block@...r.kernel.org, ceph-devel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-xfs@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH 10/12] fuse: update ki_pos in fuse_perform_write

Both callers of fuse_perform_write need to updated ki_pos, move it into
common code.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Damien Le Moal <dlemoal@...nel.org>
---
 fs/fuse/file.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 97d435874b14aa..e60e48bf392d49 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1329,7 +1329,10 @@ static ssize_t fuse_perform_write(struct kiocb *iocb,
 	fuse_write_update_attr(inode, pos, res);
 	clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
 
-	return res > 0 ? res : err;
+	if (!res)
+		return err;
+	iocb->ki_pos += res;
+	return res;
 }
 
 static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
@@ -1341,7 +1344,6 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	struct inode *inode = mapping->host;
 	ssize_t err;
 	struct fuse_conn *fc = get_fuse_conn(inode);
-	loff_t endbyte = 0;
 
 	if (fc->writeback_cache) {
 		/* Update size (EOF optimization) and mode (SUID clearing) */
@@ -1375,19 +1377,20 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		goto out;
 
 	if (iocb->ki_flags & IOCB_DIRECT) {
-		loff_t pos = iocb->ki_pos;
+		loff_t pos, endbyte;
+
 		written = generic_file_direct_write(iocb, from);
 		if (written < 0 || !iov_iter_count(from))
 			goto out;
 
-		pos += written;
-
-		written_buffered = fuse_perform_write(iocb, mapping, from, pos);
+		written_buffered = fuse_perform_write(iocb, mapping, from,
+						      iocb->ki_pos);
 		if (written_buffered < 0) {
 			err = written_buffered;
 			goto out;
 		}
-		endbyte = pos + written_buffered - 1;
+		pos = iocb->ki_pos - written_buffered;
+		endbyte = iocb->ki_pos - 1;
 
 		err = filemap_write_and_wait_range(file->f_mapping, pos,
 						   endbyte);
@@ -1399,17 +1402,11 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
 					 endbyte >> PAGE_SHIFT);
 
 		written += written_buffered;
-		iocb->ki_pos = pos + written_buffered;
 	} else {
 		written = fuse_perform_write(iocb, mapping, from, iocb->ki_pos);
-		if (written >= 0)
-			iocb->ki_pos += written;
 	}
 out:
 	inode_unlock(inode);
-	if (written > 0)
-		written = generic_write_sync(iocb, written);
-
 	return written ? written : err;
 }
 
-- 
2.39.2