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Differential D39019

tarfs: Correctly track link count.
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Authored by des on Mar 10 2023, 5:50 PM.
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sjg
stevek
kib
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Klara
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rGfd8c98a52f71: tarfs: Correctly track link count.
Summary

Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.

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rG FreeBSD src repository
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Event Timeline

des created this revision.Mar 10 2023, 5:50 PM
Herald added a subscriber: imp. · View Herald TranscriptMar 10 2023, 5:50 PM
des requested review of this revision.Mar 10 2023, 5:50 PM
Harbormaster completed remote builds in B50281: Diff 118640.Mar 10 2023, 5:50 PM
des added a child revision: D39020: tarfs: Support tar files which include file modes with permissions..Mar 10 2023, 5:50 PM
des abandoned this revision.Mar 10 2023, 5:52 PM

buggy, will resubmit

des reclaimed this revision.Mar 10 2023, 6:27 PM
des updated this revision to Diff 118643.Mar 10 2023, 6:27 PM

Now it works

Harbormaster completed remote builds in B50283: Diff 118643.Mar 10 2023, 6:28 PM
des added a reviewer: kib.Mar 11 2023, 6:22 PM
kib added inline comments.Mar 11 2023, 10:03 PM
sys/fs/tarfs/tarfs_vfsops.c
745

What protects other->nlink during the increment? Could two calls to tarfs_alloc_one() executed in parallel, targeting the same dst node?

Or even, what protects other itself? For instance, could unmount occur in parallel with the tarfs_alloc_one()?

des added inline comments.Mar 13 2023, 2:19 PM
sys/fs/tarfs/tarfs_vfsops.c
745

tarfs_alloc_one() is called sequentially during mount, and tarfs_free_node() is called sequentially during unmount or while cleaning up after a failed mount.

kib accepted this revision.Mar 13 2023, 5:56 PM
This revision is now accepted and ready to land.Mar 13 2023, 5:56 PM
Closed by commit rGfd8c98a52f71: tarfs: Correctly track link count. (authored by des). · Explain WhyMar 16 2023, 12:20 PM
This revision was automatically updated to reflect the committed changes.
des added a commit: rGfd8c98a52f71: tarfs: Correctly track link count..

Revision Contents
Changeset List

PathSize
sys/
fs/
tarfs/
13 lines
7 lines
tests/
sys/
fs/
tarfs/
2 lines

Diff 118908

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sys/fs/tarfs/tarfs_subr.c

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sys/fs/tarfs/tarfs_vfsops.c

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tests/sys/fs/tarfs/tarfs_test.sh

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