git: 2ac083f60f8c - main - Add vn_rlimit_trunc()

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=2ac083f60f8c9ce361c3daf691c60486459d87ae

commit 2ac083f60f8c9ce361c3daf691c60486459d87ae
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2022-09-18 19:52:13 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2022-09-24 16:41:18 +0000

    Add vn_rlimit_trunc()
    
    Reviewed by:    asomers, jah, markj
    Tested by:      pho
    Sponsored by:   The FreeBSD Foundation
    MFC after:      2 weeks
    Differential revision:  https://reviews.freebsd.org/D36625
---
 sys/kern/vfs_vnops.c | 24 +++++++++++++++++++-----
 sys/sys/vnode.h      |  1 +
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
index 1d2c4f332473..6eef39a37f25 100644
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -2372,6 +2372,23 @@ vn_vget_ino_gen(struct vnode *vp, vn_get_ino_t alloc, void *alloc_arg,
 	return (error);
 }
 
+static void
+vn_send_sigxfsz(struct proc *p)
+{
+	PROC_LOCK(p);
+	kern_psignal(p, SIGXFSZ);
+	PROC_UNLOCK(p);
+}
+
+int
+vn_rlimit_trunc(u_quad_t size, struct thread *td)
+{
+	if (size <= lim_cur(td, RLIMIT_FSIZE))
+		return (0);
+	vn_send_sigxfsz(td->td_proc);
+	return (EFBIG);
+}
+
 int
 vn_rlimit_fsize(const struct vnode *vp, const struct uio *uio,
     struct thread *td)
@@ -2400,11 +2417,8 @@ vn_rlimit_fsize(const struct vnode *vp, const struct uio *uio,
 	    (td->td_pflags2 & TDP2_ACCT) != 0)
 		return (0);
 
-	if (!ktr_write || ktr_filesize_limit_signal) {
-		PROC_LOCK(td->td_proc);
-		kern_psignal(td->td_proc, SIGXFSZ);
-		PROC_UNLOCK(td->td_proc);
-	}
+	if (!ktr_write || ktr_filesize_limit_signal)
+		vn_send_sigxfsz(td->td_proc);
 	return (EFBIG);
 }
 
diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h
index f3170d77e6d4..da17170cbb2d 100644
--- a/sys/sys/vnode.h
+++ b/sys/sys/vnode.h
@@ -786,6 +786,7 @@ int	vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, void *base,
 int	vn_read_from_obj(struct vnode *vp, struct uio *uio);
 int	vn_rlimit_fsize(const struct vnode *vp, const struct uio *uio,
 	    struct thread *td);
+int	vn_rlimit_trunc(u_quad_t size, struct thread *td);
 int	vn_start_write(struct vnode *vp, struct mount **mpp, int flags);
 int	vn_start_secondary_write(struct vnode *vp, struct mount **mpp,
 	    int flags);