From: Simon Glass <simon.glass@canonical.com>
Implement ext4l_exists() to check if a file or directory exists on the
filesystem. This uses ext4l_resolve_path() to look up the path and
returns 1 if found, 0 otherwise.
Wire the function into fs_legacy.c and add a basic test.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
---
fs/ext4l/interface.c | 13 +++++++++++++
fs/fs_legacy.c | 2 +-
include/ext4l.h | 8 ++++++++
test/fs/ext4l.c | 27 +++++++++++++++++++++++++++
test/py/tests/test_fs/test_ext4l.py | 7 +++++++
5 files changed, 56 insertions(+), 1 deletion(-)
@@ -636,6 +636,19 @@ int ext4l_ls(const char *dirname)
return ret;
}
+int ext4l_exists(const char *filename)
+{
+ struct inode *inode;
+
+ if (!filename)
+ return 0;
+
+ if (ext4l_resolve_path(filename, &inode))
+ return 0;
+
+ return 1;
+}
+
void ext4l_close(void)
{
if (ext4l_open_dirs > 0)
@@ -266,7 +266,7 @@ static struct fstype_info fstypes[] = {
.probe = ext4l_probe,
.close = ext4l_close,
.ls = ext4l_ls,
- .exists = fs_exists_unsupported,
+ .exists = ext4l_exists,
.size = fs_size_unsupported,
.read = fs_read_unsupported,
.write = fs_write_unsupported,
@@ -38,6 +38,14 @@ void ext4l_close(void);
*/
int ext4l_ls(const char *dirname);
+/**
+ * ext4l_exists() - Check if a file or directory exists
+ *
+ * @filename: Path to check
+ * Return: 1 if exists, 0 if not
+ */
+int ext4l_exists(const char *filename);
+
/**
* ext4l_get_uuid() - Get the filesystem UUID
*
@@ -196,3 +196,30 @@ static int fs_test_ext4l_opendir_norun(struct unit_test_state *uts)
}
FS_TEST_ARGS(fs_test_ext4l_opendir_norun, UTF_SCAN_FDT | UTF_CONSOLE |
UTF_MANUAL, { "fs_image", UT_ARG_STR });
+
+/**
+ * fs_test_ext4l_exists_norun() - Test ext4l_exists function
+ *
+ * Verifies that ext4l_exists correctly reports file existence.
+ *
+ * Arguments:
+ * fs_image: Path to the ext4 filesystem image
+ */
+static int fs_test_ext4l_exists_norun(struct unit_test_state *uts)
+{
+ const char *fs_image = ut_str(EXT4L_ARG_IMAGE);
+
+ ut_assertnonnull(fs_image);
+ ut_assertok(run_commandf("host bind 0 %s", fs_image));
+ ut_assertok(fs_set_blk_dev("host", "0", FS_TYPE_ANY));
+
+ /* Test existing directory */
+ ut_asserteq(1, ext4l_exists("/"));
+
+ /* Test non-existent paths */
+ ut_asserteq(0, ext4l_exists("/no/such/path"));
+
+ return 0;
+}
+FS_TEST_ARGS(fs_test_ext4l_exists_norun, UTF_SCAN_FDT | UTF_CONSOLE |
+ UTF_MANUAL, { "fs_image", UT_ARG_STR });
@@ -96,3 +96,10 @@ class TestExt4l:
output = ubman.run_command(
f'ut -f fs fs_test_ext4l_opendir_norun fs_image={ext4_image}')
assert 'failures: 0' in output
+
+ def test_exists(self, ubman, ext4_image):
+ """Test that ext4l_exists reports file existence correctly."""
+ with ubman.log.section('Test ext4l exists'):
+ output = ubman.run_command(
+ f'ut -f fs fs_test_ext4l_exists_norun fs_image={ext4_image}')
+ assert 'failures: 0' in output