copy_file_range: Call vn_rdwr() even for zero-length files
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Authored by markj on Jan 20 2024, 5:29 PM.

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Reviewers

asomers
kib
rmacklem
olce

Commits

rG08f3d5b60cdf: copy_file_range: Call vn_rdwr() at least once

Summary

This ensures that we invoke VOP_READ on the input file even if it's
empty, which in turn helps ensure that filesystems update the atime of
the file.

PR: 274615

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Repository

rG FreeBSD src repository

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Event Timeline

markj created this revision.Jan 20 2024, 5:29 PM

Herald added a subscriber: imp. · View Herald TranscriptJan 20 2024, 5:29 PM

markj requested review of this revision.Jan 20 2024, 5:29 PM

Harbormaster completed remote builds in B55512: Diff 133096.Jan 20 2024, 5:29 PM

kib accepted this revision.Jan 20 2024, 6:45 PM

This revision is now accepted and ready to land.Jan 20 2024, 6:45 PM

olce accepted this revision.Jan 20 2024, 8:06 PM

Looks ok to me.

Needs rebasing but passes the additional test from D44609.

des added inline comments.Apr 3 2024, 2:50 PM

sys/kern/vfs_vnops.c
3592	Instead of adding a flag, you could simply switch from while to do-while.

markj added inline comments.Apr 3 2024, 3:39 PM

sys/kern/vfs_vnops.c
3592	It's not that simple - we could have `interrupted != 0` before the first iteration.

Closed by commit rG08f3d5b60cdf: copy_file_range: Call vn_rdwr() at least once (authored by markj). · Explain WhyApr 4 2024, 9:17 PM

This revision was automatically updated to reflect the committed changes.

markj added a commit: rG08f3d5b60cdf: copy_file_range: Call vn_rdwr() at least once.

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Size

sys/

kern/

vfs_vnops.c

16 lines

Diff 136548

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copy_file_range: Call vn_rdwr() even for zero-length filesClosedPublicActions