linux-kernel - [PATCH v2 2/2] fat: always use dir_emit

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Date: Tue, 25 Jun 2024 14:51:33 -0300
From: Thadeu Lima de Souza Cascardo <cascardo@...lia.com>
To: linux-fsdevel@...r.kernel.org
Cc: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	linux-kernel@...r.kernel.org,
	Gwendal Grignou <gwendal@...omium.org>,
	dlunev@...omium.org,
	Thadeu Lima de Souza Cascardo <cascardo@...lia.com>
Subject: [PATCH v2 2/2] fat: always use dir_emit_dots and ignore . and .. entries

Instead of only using dir_emit_dots for the root inode and explictily
requiring the . and .. entries to emit them, use dir_emit_dots for all
directories.

That allows filesystems with directories without the . or .. entries to
still show them.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...lia.com>
---
 fs/fat/dir.c | 24 +++++++++---------------
 1 file changed, 9 insertions(+), 15 deletions(-)

diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 4e4a359a1ea3..e70781569de5 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -583,15 +583,14 @@ static int __fat_readdir(struct inode *inode, struct file *file,
 	mutex_lock(&sbi->s_lock);
 
 	cpos = ctx->pos;
-	/* Fake . and .. for the root directory. */
-	if (inode->i_ino == MSDOS_ROOT_INO) {
-		if (!dir_emit_dots(file, ctx))
-			goto out;
-		if (ctx->pos == 2) {
-			fake_offset = 1;
-			cpos = 0;
-		}
+
+	if (!dir_emit_dots(file, ctx))
+		goto out;
+	if (ctx->pos == 2) {
+		fake_offset = 1;
+		cpos = 0;
 	}
+
 	if (cpos & (sizeof(struct msdos_dir_entry) - 1)) {
 		ret = -ENOENT;
 		goto out;
@@ -671,13 +670,8 @@ static int __fat_readdir(struct inode *inode, struct file *file,
 	if (fake_offset && ctx->pos < 2)
 		ctx->pos = 2;
 
-	if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) {
-		if (!dir_emit_dot(file, ctx))
-			goto fill_failed;
-	} else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
-		if (!dir_emit_dotdot(file, ctx))
-			goto fill_failed;
-	} else {
+	if (memcmp(de->name, MSDOS_DOT, MSDOS_NAME) &&
+	    memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
 		unsigned long inum;
 		loff_t i_pos = fat_make_i_pos(sb, bh, de);
 		struct inode *tmp = fat_iget(sb, i_pos);
-- 
2.34.1