linux-ext4 - [PATCH 6/8] fuse2fs: add tracing for retrieving timestamps

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Message-ID: <175573714501.22854.12509350759198668701.stgit@frogsfrogsfrogs>
Date: Wed, 20 Aug 2025 18:22:44 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: tytso@....edu
Cc: John@...ves.net, bernd@...ernd.com, linux-fsdevel@...r.kernel.org,
 linux-ext4@...r.kernel.org, miklos@...redi.hu, joannelkoong@...il.com,
 neal@...pa.dev
Subject: [PATCH 6/8] fuse2fs: add tracing for retrieving timestamps

From: Darrick J. Wong <djwong@...nel.org>

Add tracing for retrieving timestamps so we can debug the weird
behavior.

Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 misc/fuse2fs.c |   22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)


diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index df84884ba6b7d0..80bd47549925bf 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -1571,9 +1571,11 @@ static void *op_init(struct fuse_conn_info *conn
 	return ff;
 }
 
-static int stat_inode(ext2_filsys fs, ext2_ino_t ino, struct stat *statbuf)
+static int fuse2fs_stat(struct fuse2fs *ff, ext2_ino_t ino,
+			struct stat *statbuf)
 {
 	struct ext2_inode_large inode;
+	ext2_filsys fs = ff->fs;
 	dev_t fakedev = 0;
 	errcode_t err;
 	int ret = 0;
@@ -1612,6 +1614,13 @@ static int stat_inode(ext2_filsys fs, ext2_ino_t ino, struct stat *statbuf)
 #else
 	statbuf->st_ctime = tv.tv_sec;
 #endif
+
+	dbg_printf(ff, "%s: ino=%d atime=%lld.%ld mtime=%lld.%ld ctime=%lld.%ld\n",
+		   __func__, ino,
+		   (long long int)statbuf->st_atim.tv_sec, statbuf->st_atim.tv_nsec,
+		   (long long int)statbuf->st_mtim.tv_sec, statbuf->st_mtim.tv_nsec,
+		   (long long int)statbuf->st_ctim.tv_sec, statbuf->st_ctim.tv_nsec);
+
 	if (LINUX_S_ISCHR(inode.i_mode) ||
 	    LINUX_S_ISBLK(inode.i_mode)) {
 		if (inode.i_block[0])
@@ -1669,16 +1678,15 @@ static int op_getattr(const char *path, struct stat *statbuf
 			)
 {
 	struct fuse2fs *ff = fuse2fs_get();
-	ext2_filsys fs;
 	ext2_ino_t ino;
 	int ret = 0;
 
 	FUSE2FS_CHECK_CONTEXT(ff);
-	fs = fuse2fs_start(ff);
+	fuse2fs_start(ff);
 	ret = fuse2fs_file_ino(ff, path, fi, &ino);
 	if (ret)
 		goto out;
-	ret = stat_inode(fs, ino, statbuf);
+	ret = fuse2fs_stat(ff, ino, statbuf);
 out:
 	fuse2fs_finish(ff, ret);
 	return ret;
@@ -3423,7 +3431,7 @@ static int fuse2fs_file_uses_iomap(struct fuse2fs *ff, ext2_ino_t ino)
 	if (!fuse2fs_iomap_enabled(ff))
 		return 0;
 
-	ret = stat_inode(ff->fs, ino, &statbuf);
+	ret = fuse2fs_stat(ff, ino, &statbuf);
 	if (ret)
 		return ret;
 
@@ -4334,7 +4342,7 @@ static int op_readdir_iter(ext2_ino_t dir EXT2FS_ATTR((unused)),
 
 #if FUSE_VERSION >= FUSE_MAKE_VERSION(3, 0)
 	if (i->flags == FUSE_READDIR_PLUS) {
-		ret = stat_inode(i->fs, dirent->inode, &stat);
+		ret = fuse2fs_stat(i->ff, dirent->inode, &stat);
 		if (ret)
 			return DIRENT_ABORT;
 	}
@@ -4618,7 +4626,7 @@ static int op_fgetattr(const char *path EXT2FS_ATTR((unused)),
 	FUSE2FS_CHECK_HANDLE(ff, fh);
 	dbg_printf(ff, "%s: ino=%d\n", __func__, fh->ino);
 	fs = fuse2fs_start(ff);
-	ret = stat_inode(fs, fh->ino, statbuf);
+	ret = fuse2fs_stat(ff, fh->ino, statbuf);
 	fuse2fs_finish(ff, ret);
 
 	return ret;