linux-ext4 - [PATCH 19/38] lib/ext2fs: fix two compiler warnings in windows

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Date:   Sat, 21 Jan 2023 12:32:11 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-ext4@...r.kernel.org
Subject: [PATCH 19/38] lib/ext2fs: fix two compiler warnings in windows_io.c

From: Eric Biggers <ebiggers@...gle.com>

init_private_data() triggers a -Wstringop-truncation warning, due to a
real bug.  Fix it.

windows_open() has a -Wunused-variable warning because some
macOS-specific code was copied there for no reason.  Remove it.

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 lib/ext2fs/windows_io.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/lib/ext2fs/windows_io.c b/lib/ext2fs/windows_io.c
index 68b5571bb..83aea68b6 100644
--- a/lib/ext2fs/windows_io.c
+++ b/lib/ext2fs/windows_io.c
@@ -499,9 +499,6 @@ static errcode_t windows_open_channel(struct windows_private_data *data,
 #if defined(O_DIRECT)
 	if (flags & IO_FLAG_DIRECT_IO)
 		io->align = ext2fs_get_dio_alignment(data->dev);
-#elif defined(F_NOCACHE)
-	if (flags & IO_FLAG_DIRECT_IO)
-		io->align = 4096;
 #endif
 
 	/*
@@ -609,7 +606,7 @@ static struct windows_private_data *init_private_data(const char *name, int flag
 		return NULL;
 
 	memset(data, 0, sizeof(struct windows_private_data));
-	strncpy(data->name, name, sizeof(data->name));
+	strncpy(data->name, name, sizeof(data->name) - 1);
 	data->magic = EXT2_ET_MAGIC_WINDOWS_IO_CHANNEL;
 	data->io_stats.num_fields = 2;
 	data->flags = flags;
@@ -620,7 +617,6 @@ static struct windows_private_data *init_private_data(const char *name, int flag
 
 static errcode_t windows_open(const char *name, int flags, io_channel *channel)
 {
-	int fd = -1;
 	int open_flags;
 	struct windows_private_data *data;
 
@@ -644,12 +640,6 @@ static errcode_t windows_open(const char *name, int flags, io_channel *channel)
 		return EXT2_ET_BAD_DEVICE_NAME;
 	}
 
-#if defined(F_NOCACHE) && !defined(IO_DIRECT)
-	if (flags & IO_FLAG_DIRECT_IO) {
-		if (fcntl(fd, F_NOCACHE, 1) < 0)
-			return errno;
-	}
-#endif
 	return windows_open_channel(data, flags, channel, windows_io_manager);
 }
 
-- 
2.39.0