Diffusion FreeBSD src repository 4c3a868d13c0

fcntl(F_SETFL): only allow one thread to perform F_SETFL
4c3a868d13c0
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Description

fcntl(F_SETFL): only allow one thread to perform F_SETFL

Use f_vflags file locking for this.
Allowing more than one thread handling F_SETFL might cause de-sync
between real driver state and flags.

Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D52487

Details

Provenance

kib	Authored on Sep 11 2025, 10:05 AM

Reviewer

Differential Revision

D52487: fcntl(F_SETFL): only allow one thread to perform F_SETFL

Parents

rG0ee6f5efdfc6: kern/vfs_vnops.c: generalize the lock primitive for file foffset

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Event Timeline

kib committed rG4c3a868d13c0: fcntl(F_SETFL): only allow one thread to perform F_SETFL (authored by kib).Sep 20 2025, 7:24 PM

kib added an edge: D52487: fcntl(F_SETFL): only allow one thread to perform F_SETFL.Sep 20 2025, 7:35 PM

jhb mentioned this in rG11870bb24801: fcntl(F_SETFL): only allow one thread to perform F_SETFL.Dec 18 2025, 6:23 PM

jhb mentioned this in rG7bf3b6d8e426: fcntl(F_SETFL): only allow one thread to perform F_SETFL.

Changes (3)

Path

Size

sys/

kern/

sys/

rG4c3a868d13c0

sys/kern/kern_descrip.c

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sys/kern/vfs_vnops.c

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sys/sys/file.h

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