NSFS | Folders extended attributes

[romayalon]

Signed-off-by: Romy romy2232@gmail.com

Explain the changes

1. FS Napi - added dir_content xattr to the USER_XATTRS vector.

2. test_namespace_fs - added unit tests

3. namespace_fs -

   b. list objects -
   - Skipped processing entry when entry is .folder file.
   - Checked existence of XATTR_DIR_CONTENT xattr in the dir's xattr in process_dir and when evaluated to true the entry will be added to the objects list (when no delimiter or in other corner cases)

   c. read_object_md - added true to the call of get_version_path in order to get the directory path and not the .folder file when object is a directory content object.

   d. upload_object / complete_multipart_upload -
   d.1. upload_object -
   * Created the .folder file only when content size > 0 when the entry is a directory.
   * Created _create_empty_dir_content function for the creation of directory objects of size 0 - this function created
   the directory key, sets the xattr on the directory, deleted the old directory if exists, and returns directory info as a
   upload_info response.
   * On non-empty dir content - added a check to finish_upload() to not set the xattr on the object itself but put it on the
   directory instead.
   d.2. mpu -
   * we always create a .folder file as we assume the size is always > 0
   * when object is a dir content object -
   - skipped set xattr on .folder.
   - replaced old xattr with new xattr and added XATTR_DIR_OBJ xattr to the directory.
   - no override case - as we assume size > 0.

   e. delete_object / delete_multiple_objects -
   - Unlink - skipped when the file is .folder and error code is ENOENT (needed for directory objects of size 0)
   - Called clear xattr on directories ( needed for non-empty directory objects )

   f. get_object - called stat when the file is .folder and checked if XATTR_DIR_CONTENT xattr exists, if yes, returned {}; (needed for directory objects of size 0)

Issues: Fixed #xxx / Gap #xxx

1. gap - upgrade script for existing directory objects (need to copy .folder xattr to the folder itself)
2. Fixed #NSFS dir attrs should be taken from the dir itself and use a .folder subfile only if content is provided at all #6980

Testing Instructions:

• Doc added/updated
• Tests added

[jackyalbo]

Mainly need more explanations. Also let's schedule a meeting in order to push this quicker.

[guymguym]

godspeed

[dannyzaken]

waiting for #6973