[PATCH] vfs: fix check for tmpfile support

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When ext4 is used with quota support the test fails with EINVAL because
it is run after we idmapped the mount. If the caller's fs{g,u}ids aren't
mapped then we fail and log a misleading error. Move the checks for
tmpfile support right at the beginning of the test in all tests.

Reported-by: Luis Henriques <lhenriques@xxxxxxx>
Link: https://lore.kernel.org/r/20240222-knast-reifen-953312ce17a9@brauner
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
---
 src/vfs/idmapped-mounts.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/src/vfs/idmapped-mounts.c b/src/vfs/idmapped-mounts.c
index 547182fe..e490f3d7 100644
--- a/src/vfs/idmapped-mounts.c
+++ b/src/vfs/idmapped-mounts.c
@@ -3815,6 +3815,8 @@ int tcore_setgid_create_idmapped(const struct vfstest_info *info)
 		goto out;
 	}
 
+	supported = openat_tmpfile_supported(info->t_dir1_fd);
+
 	/* Changing mount properties on a detached mount. */
 	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
 	if (attr.userns_fd < 0) {
@@ -3838,8 +3840,6 @@ int tcore_setgid_create_idmapped(const struct vfstest_info *info)
 		goto out;
 	}
 
-	supported = openat_tmpfile_supported(open_tree_fd);
-
 	pid = fork();
 	if (pid < 0) {
 		log_stderr("failure: fork");
@@ -3991,6 +3991,8 @@ int tcore_setgid_create_idmapped_in_userns(const struct vfstest_info *info)
 		goto out;
 	}
 
+	supported = openat_tmpfile_supported(info->t_dir1_fd);
+
 	/* Changing mount properties on a detached mount. */
 	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
 	if (attr.userns_fd < 0) {
@@ -4014,8 +4016,6 @@ int tcore_setgid_create_idmapped_in_userns(const struct vfstest_info *info)
 		goto out;
 	}
 
-	supported = openat_tmpfile_supported(open_tree_fd);
-
 	pid = fork();
 	if (pid < 0) {
 		log_stderr("failure: fork");
@@ -7715,6 +7715,8 @@ static int setgid_create_umask_idmapped(const struct vfstest_info *info)
 		goto out;
 	}
 
+	supported = openat_tmpfile_supported(info->t_dir1_fd);
+
 	/* Changing mount properties on a detached mount. */
 	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
 	if (attr.userns_fd < 0) {
@@ -7738,8 +7740,6 @@ static int setgid_create_umask_idmapped(const struct vfstest_info *info)
 		goto out;
 	}
 
-	supported = openat_tmpfile_supported(open_tree_fd);
-
 	pid = fork();
 	if (pid < 0) {
 		log_stderr("failure: fork");
@@ -7929,6 +7929,8 @@ static int setgid_create_umask_idmapped_in_userns(const struct vfstest_info *inf
 		goto out;
 	}
 
+	supported = openat_tmpfile_supported(info->t_dir1_fd);
+
 	/* Changing mount properties on a detached mount. */
 	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
 	if (attr.userns_fd < 0) {
@@ -7952,8 +7954,6 @@ static int setgid_create_umask_idmapped_in_userns(const struct vfstest_info *inf
 		goto out;
 	}
 
-	supported = openat_tmpfile_supported(open_tree_fd);
-
 	/*
 	 * Below we verify that setgid inheritance for a newly created file or
 	 * directory works correctly. As part of this we need to verify that
@@ -8163,6 +8163,8 @@ static int setgid_create_acl_idmapped(const struct vfstest_info *info)
 		goto out;
 	}
 
+	supported = openat_tmpfile_supported(info->t_dir1_fd);
+
 	/* Changing mount properties on a detached mount. */
 	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
 	if (attr.userns_fd < 0) {
@@ -8186,8 +8188,6 @@ static int setgid_create_acl_idmapped(const struct vfstest_info *info)
 		goto out;
 	}
 
-	supported = openat_tmpfile_supported(open_tree_fd);
-
 	pid = fork();
 	if (pid < 0) {
 		log_stderr("failure: fork");
@@ -8518,6 +8518,8 @@ static int setgid_create_acl_idmapped_in_userns(const struct vfstest_info *info)
 		goto out;
 	}
 
+	supported = openat_tmpfile_supported(info->t_dir1_fd);
+
 	/* Changing mount properties on a detached mount. */
 	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
 	if (attr.userns_fd < 0) {
@@ -8541,8 +8543,6 @@ static int setgid_create_acl_idmapped_in_userns(const struct vfstest_info *info)
 		goto out;
 	}
 
-	supported = openat_tmpfile_supported(open_tree_fd);
-
 	/*
 	 * Below we verify that setgid inheritance for a newly created file or
 	 * directory works correctly. As part of this we need to verify that
-- 
2.43.0





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