Implement directory listing (ls) for the ext4l filesystem driver. This
includes path resolution with symlink following (limited to 8 levels to
prevent loops).
Add ext4l_ls() which uses ext4_lookup() for path resolution and
ext4_readdir() for directory enumeration. The dir_context actor callback
formats and prints each directory entry.
Export ext4_lookup() from namei.c and add declarations to ext4.h.
Add test_ls to the Python test suite, which creates a test file using
debugfs and verifies it appears in the directory listing with the
correct size.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Cover-letter:
ext4l: Add support for listing directoties (Part H)
This series adds directory-listing support to the ext4l filesystem
driver. It exports a few required functions from the Linux ext4 code,
fixes the dir_emit() stub to properly call the actor callback, and
implements ext4l_ls() with path resolution and symlink following.
END
Signed-off-by: Simon Glass <simon.glass@canonical.com>
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