[WIP] MFS improvements #4515
Closed
[WIP] MFS improvements #4515
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Member
Stebalien
commented
Dec 21, 2017
Stebalien
commented
- Avoid syncing/flushing after closing an fd.
- Avoid reading/writing after closing an fd.
- Use a rw lock to guard the file's node (allows concurrent size checks).
- Simpler mode/access checks.
- Fix MFS: Race when reading node and taking read/write lock #4514 (take the read/write lock before reading the file's node).
- Syncing/flushing when we don't need to.
* Ensure we don't flush unnecessarily. * Make it easier to work with modes. * Better handle closed files. License: MIT Signed-off-by: Steven Allen <[email protected]>
Otherwise, it could be exchanged out from under us! fixes #4514 License: MIT Signed-off-by: Steven Allen <[email protected]>
This allows us to, e.g., get the size, etc. in parallel. License: MIT Signed-off-by: Steven Allen <[email protected]>
Technically, the sync could fail. If it does, we don't want to allow syncing *again* without the write lock held. License: MIT Signed-off-by: Steven Allen <[email protected]>
ghost
assigned 
|
TODO: Test the race. |
|
I think I'm going to take a different approach to modes. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.