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diff --git a/bin/chflags/chflags.1.nocache b/bin/chflags/chflags.1
--- a/bin/chflags/chflags.1.nocache
+++ b/bin/chflags/chflags.1
@@ -29,7 +29,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd June 12, 2018
+.Dd July 9, 2026
.Dt CHFLAGS 1
.Os
.Sh NAME
@@ -105,6 +105,8 @@
.Bl -tag -offset indent -width ".Cm opaque"
.It Cm arch , archived
set the archived flag (super-user only)
+.It Cm udontcache , dontcache
+set the dont cache flag (owner or super-user only)
.It Cm nodump
set the nodump flag (owner or super-user only)
.It Cm opaque
diff --git a/lib/libc/gen/strtofflags.c.nocache b/lib/libc/gen/strtofflags.c
--- a/lib/libc/gen/strtofflags.c.nocache
+++ b/lib/libc/gen/strtofflags.c
@@ -80,7 +80,9 @@
{ "nosparse", 0, UF_SPARSE },
{ "nousparse", 0, UF_SPARSE },
{ "nosystem", 0, UF_SYSTEM },
- { "nousystem", 0, UF_SYSTEM }
+ { "nousystem", 0, UF_SYSTEM },
+ { "nodontcache", 0, UF_DONTCACHE },
+ { "noudontcache", 0, UF_DONTCACHE }
};
#define nmappings (sizeof(mapping) / sizeof(mapping[0]))
diff --git a/sys/fs/tmpfs/tmpfs_subr.c.nocache b/sys/fs/tmpfs/tmpfs_subr.c
--- a/sys/fs/tmpfs/tmpfs_subr.c.nocache
+++ b/sys/fs/tmpfs/tmpfs_subr.c
@@ -2042,7 +2042,7 @@
if ((flags & ~(SF_APPEND | SF_ARCHIVED | SF_IMMUTABLE | SF_NOUNLINK |
UF_APPEND | UF_ARCHIVE | UF_HIDDEN | UF_IMMUTABLE | UF_NODUMP |
UF_NOUNLINK | UF_OFFLINE | UF_OPAQUE | UF_READONLY | UF_REPARSE |
- UF_SPARSE | UF_SYSTEM)) != 0)
+ UF_SPARSE | UF_SYSTEM | UF_DONTCACHE)) != 0)
return (EOPNOTSUPP);
/* Disallow this operation if the file system is mounted read-only. */
diff --git a/sys/sys/stat.h.nocache b/sys/sys/stat.h
--- a/sys/sys/stat.h.nocache
+++ b/sys/sys/stat.h
@@ -327,6 +327,7 @@
#define UF_REPARSE 0x00000400 /* Windows reparse point file bit */
#define UF_ARCHIVE 0x00000800 /* file needs to be archived */
#define UF_READONLY 0x00001000 /* Windows readonly file bit */
+#define UF_DONTCACHE 0x00002000 /* don't cache file data (NFSv4) */
/* This is the same as the MacOS X definition of UF_HIDDEN. */
#define UF_HIDDEN 0x00008000 /* file is hidden */
diff --git a/sys/ufs/ufs/ufs_vnops.c.nocache b/sys/ufs/ufs/ufs_vnops.c
--- a/sys/ufs/ufs/ufs_vnops.c.nocache
+++ b/sys/ufs/ufs/ufs_vnops.c
@@ -662,7 +662,7 @@
SF_NOUNLINK | SF_SNAPSHOT | UF_APPEND | UF_ARCHIVE |
UF_HIDDEN | UF_IMMUTABLE | UF_NODUMP | UF_NOUNLINK |
UF_OFFLINE | UF_OPAQUE | UF_READONLY | UF_REPARSE |
- UF_SPARSE | UF_SYSTEM)) != 0)
+ UF_SPARSE | UF_SYSTEM | UF_DONTCACHE)) != 0)
return (EOPNOTSUPP);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);

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