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vfs: add callback readv and writev handlers - #66548

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dcavalcante:vfs-readv-writev
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dcavalcante:vfs-readv-writev

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A mounted VFS causes callback readv and writev to call missing handlers, breaking both virtual and real file descriptors.

This adds both handlers and preserves I/O for real descriptors..

Fixes: #66532

@nodejs-github-bot nodejs-github-bot added needs-ci PRs that need a full CI run. vfs Issues and PRs related to the virtual filesystem subsystem. labels Oct 6, 2026
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github-actions Bot commented Oct 6, 2026

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Welcome to Node.js, and thank you for your first contribution!

Before review, please take a moment to read:

Please make sure every commit is signed off. For a first pull request, GitHub Actions require collaborator approval and Jenkins CI must be started by a collaborator or triager, so an initial wait is normal.

A mounted VFS causes callback readv and writev to call missing
handlers, breaking both virtual and real file descriptors.

Add both handlers while preserving I/O for real descriptors.

Signed-off-by: Daniel Cavalcante <dcavalcante@gmail.com>
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codecov Bot commented Oct 6, 2026 •

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.40%. Comparing base (9746ebc) to head (7710c7a).
⚠️ Report is 518 commits behind head on main.

Additional details and impacted files
@@           Coverage Diff           @@
##             main   #66548   +/-   ##
=======================================
  Coverage   90.40%   90.40%           
=======================================
  Files         791      791           
  Lines      276120   276132   +12     
  Branches    53022    53039   +17     
=======================================
+ Hits       249618   249645   +27     
+ Misses      16897    16894    -3     
+ Partials     9605     9593   -12     
Files with missing lines Coverage Δ
lib/internal/vfs/setup.js 87.26% <100.00%> (+0.13%) ⬆️

... and 20 files with indirect coverage changes

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lgtm

@pipobscure pipobscure added the request-ci Add this label to start a Jenkins CI on a PR. Only starts once the PR has an approving review. label Nov 10, 2026
@github-actions github-actions Bot removed the request-ci Add this label to start a Jenkins CI on a PR. Only starts once the PR has an approving review. label Nov 10, 2026
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@dcavalcante

dcavalcante commented Nov 10, 2026 •

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Thanks for the approval @pipobscure ! I noticed it's failing node-test-commit-plinux-rhel10-ppc64le but Jenkins logs are restricted so I can't check it..

@pipobscure pipobscure added resume-ci Add this label to resume the latest eligible Jenkins CI run on a PR with an approving review. author ready PRs with CI started, the required approvals, and no outstanding review comments. labels Nov 10, 2026
@github-actions github-actions Bot removed the resume-ci Add this label to resume the latest eligible Jenkins CI run on a PR with an approving review. label Nov 10, 2026
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It looks like this is a flaky test tracked in #67374 . I'll double-check tomorrow.

@pipobscure pipobscure added the resume-ci Add this label to resume the latest eligible Jenkins CI run on a PR with an approving review. label Nov 11, 2026
@github-actions github-actions Bot added resume-ci-failed Resuming CI with the resume-ci label failed and requires manual intervention. and removed resume-ci Add this label to resume the latest eligible Jenkins CI run on a PR with an approving review. labels Nov 11, 2026
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@pipobscure pipobscure added request-ci Add this label to start a Jenkins CI on a PR. Only starts once the PR has an approving review. and removed resume-ci-failed Resuming CI with the resume-ci label failed and requires manual intervention. labels Nov 11, 2026
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@panva the label based CI seems stuck. What is the best way to actually get CI to run again? Should I just wait for the test to be fixed in #67379 ? Your advice is appreciated!

@github-actions github-actions Bot removed the request-ci Add this label to start a Jenkins CI on a PR. Only starts once the PR has an approving review. label Nov 11, 2026
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CI: https://ci.nodejs.org/job/node-test-pull-request/78979/

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vfs: createVfsHandlers() does not implement writev(fd, buffers, position)

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