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buf: Add sysctl flag CTLFLAG_TUN to loader tunable

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The sysctl variable 'vfs.unmapped_buf_allowed' is actually a loader
tunable. Add sysctl flag CTLFLAG_TUN to it so that `sysctl -T` will
report it correctly.

No functional change intended.

Reviewed by:	kib, imp
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D42113

(cherry picked from commit 31b94065300a76e52c26b8caec7256574d64a777)
This commit is contained in:
Zhenlei Huang 2023-10-09 18:30:22 +08:00
parent e4f97a1ec7
commit 8c4eaac153
1 changed files with 2 additions and 1 deletions
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3
sys/kern/vfs_bio.c
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@ -320,7 +320,8 @@ SYSCTL_COUNTER_U64(_vfs, OID_AUTO, notbufdflushes, CTLFLAG_RD, &notbufdflushes,
static long barrierwrites;
SYSCTL_LONG(_vfs, OID_AUTO, barrierwrites, CTLFLAG_RW | CTLFLAG_STATS,
&barrierwrites, 0, "Number of barrier writes");
SYSCTL_INT(_vfs, OID_AUTO, unmapped_buf_allowed, CTLFLAG_RD,
SYSCTL_INT(_vfs, OID_AUTO, unmapped_buf_allowed,
CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
&unmapped_buf_allowed, 0,
"Permit the use of the unmapped i/o");
int maxbcachebuf = MAXBCACHEBUF;