diff options
| author | Rick Macklem <rmacklem@FreeBSD.org> | 2026-07-12 22:45:28 +0000 |
|---|---|---|
| committer | Rick Macklem <rmacklem@FreeBSD.org> | 2026-07-12 22:45:28 +0000 |
| commit | 74654ba3b1b3bcf6ba8870a54310accbb6adbf0b (patch) | |
| tree | aed5adabfa29333d0ee54590a3e1507cb09a8479 | |
| parent | 87fb416ac8828d07fdf23a2c0d35d88efafce2af (diff) | |
chflags: Add a new UF_DONTCACHE flag
This internet draft (which is close to being an RFC)
specifies a new NFSv4.2 attribute which tells the NFSv4.2
client to not cache file data. (Similar to O_DIRECT, but
triggered by this attribute set on the file on the NFSv4.2
server and not by the application's open(2).)
https://datatracker.ietf.org/doc/draft-ietf-nfsv4-uncacheable-files/
This patch adds a new chflags(1) flag called UF_DONTCACHE to
implement this.
Patches for NFS and ZFS will be done separately.
Reviewed by: kib
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D58181
| -rw-r--r-- | lib/libc/gen/strtofflags.c | 4 | ||||
| -rw-r--r-- | sys/fs/tmpfs/tmpfs_subr.c | 2 | ||||
| -rw-r--r-- | sys/sys/stat.h | 1 | ||||
| -rw-r--r-- | sys/ufs/ufs/ufs_vnops.c | 2 |
4 files changed, 6 insertions, 3 deletions
diff --git a/lib/libc/gen/strtofflags.c b/lib/libc/gen/strtofflags.c index 73b4db54ccdd..ca12401c37e5 100644 --- a/lib/libc/gen/strtofflags.c +++ b/lib/libc/gen/strtofflags.c @@ -80,7 +80,9 @@ static struct { { "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 b/sys/fs/tmpfs/tmpfs_subr.c index dd281d18d87d..c9a9a3114fb3 100644 --- a/sys/fs/tmpfs/tmpfs_subr.c +++ b/sys/fs/tmpfs/tmpfs_subr.c @@ -2042,7 +2042,7 @@ tmpfs_chflags(struct vnode *vp, u_long flags, struct ucred *cred, 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 b/sys/sys/stat.h index 0c58838094ed..457ec99365d2 100644 --- a/sys/sys/stat.h +++ b/sys/sys/stat.h @@ -327,6 +327,7 @@ struct nstat { #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 b/sys/ufs/ufs/ufs_vnops.c index 1d04e1b2785f..762b5bb5b5ec 100644 --- a/sys/ufs/ufs/ufs_vnops.c +++ b/sys/ufs/ufs/ufs_vnops.c @@ -667,7 +667,7 @@ ufs_setattr( 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); |