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add: spiffs issues documentation

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Issues documented:
 - SPIFFS is unable to utilize 100% of partition space
 - Long time between write function calls
 - Memory leaks when deleting file

JIRA IDF-3776
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Matus Fabo 2021-09-29 14:24:10 +02:00
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docs/en/api-reference/storage/spiffs.rst
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@ -14,6 +14,9 @@ Notes
- Currently, SPIFFS does not support directories, it produces a flat structure. If SPIFFS is mounted under ``/spiffs``, then creating a file with the path ``/spiffs/tmp/myfile.txt`` will create a file called ``/tmp/myfile.txt`` in SPIFFS, instead of ``myfile.txt`` in the directory ``/spiffs/tmp``.
- It is not a real-time stack. One write operation might take much longer than another.
- For now, it does not detect or handle bad blocks.
- SPIFFS is able to reliably utilize only around 75% of assigned partition space.
- When the filesystem is running out of space, the garbage collector is trying to find free space by scanning the filesystem multiple times, which can take up to a few seconds per write function call, depending on required space.
- Deleting files does not always delete the whole file, which leaves unusable sections throughout the filesystem.
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