FreeBSD: Clean up the use of ioflags

- Prefer O_* flags over F* flags that mostly mirror O_* flags anyway,
  but O_* flags seem to be preferred.
- Simplify the code as all the F*SYNC flags were defined as FFSYNC flag.
- Don't define FRSYNC flag, so we don't generate unnecessary ZIL commits.
- Remove EXCL define, FreeBSD ignores the excl argument for zfs_create()
  anyway.

Reviewed-by: Allan Jude <allan@klarasystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Pawel Jakub Dawidek <pawel@dawidek.net>
Closes #13400

include/os/freebsd/spl/sys/vnode.h

@@ -136,17 +136,7 @@ vn_flush_cached_data(vnode_t *vp, boolean_t sync)
 #define	va_blksize	va_blocksize
 
 #define	MAXOFFSET_T	OFF_MAX
-#define	EXCL		0
 
-#define	FCREAT		O_CREAT
-#define	FTRUNC		O_TRUNC
-#define	FEXCL		O_EXCL
-#ifndef FDSYNC
-#define	FDSYNC		FFSYNC
-#endif
-#define	FRSYNC		FFSYNC
-#define	FSYNC		FFSYNC
-#define	FOFFMAX		0x00
 #define	FIGNORECASE	0x00
 
 /*

lib/libspl/include/os/freebsd/sys/file.h

@@ -29,14 +29,6 @@
 
 #include_next <sys/file.h>
 
-#define	FCREAT	O_CREAT
-#define	FTRUNC	O_TRUNC
-#define	FSYNC	O_SYNC
-#define	FDSYNC	O_DSYNC
-#define	FEXCL	O_EXCL
-
-#define	FNODSYNC	0x10000	/* fsync pseudo flag */
-#define	FNOFOLLOW	0x20000	/* don't follow symlinks */
 #define	FIGNORECASE	0x80000	/* request case-insensitive lookups */
 
 #endif

module/os/freebsd/zfs/zfs_vnops_os.c

@@ -241,7 +241,7 @@ zfs_open(vnode_t **vpp, int flag, cred_t *cr)
 	}
 
 	/* Keep a count of the synchronous opens in the znode */
-	if (flag & (FSYNC | FDSYNC))
+	if (flag & O_SYNC)
 		atomic_inc_32(&zp->z_sync_cnt);
 
 	ZFS_EXIT(zfsvfs);
@@ -259,7 +259,7 @@ zfs_close(vnode_t *vp, int flag, int count, offset_t offset, cred_t *cr)
 	ZFS_VERIFY_ZP(zp);
 
 	/* Decrement the synchronous opens in the znode */
-	if ((flag & (FSYNC | FDSYNC)) && (count == 1))
+	if ((flag & O_SYNC) && (count == 1))
 		atomic_dec_32(&zp->z_sync_cnt);
 
 	ZFS_EXIT(zfsvfs);
@@ -4402,11 +4402,11 @@ ioflags(int ioflags)
 	int flags = 0;
 
 	if (ioflags & IO_APPEND)
-		flags |= FAPPEND;
+		flags |= O_APPEND;
 	if (ioflags & IO_NDELAY)
-		flags |= FNONBLOCK;
+		flags |= O_NONBLOCK;
 	if (ioflags & IO_SYNC)
-		flags |= (FSYNC | FDSYNC | FRSYNC);
+		flags |= O_SYNC;
 
 	return (flags);
 }
@@ -4627,7 +4627,7 @@ zfs_freebsd_create(struct vop_create_args *ap)
 	zfsvfs = ap->a_dvp->v_mount->mnt_data;
 	*ap->a_vpp = NULL;
 
-	rc = zfs_create(VTOZ(ap->a_dvp), cnp->cn_nameptr, vap, !EXCL, mode,
+	rc = zfs_create(VTOZ(ap->a_dvp), cnp->cn_nameptr, vap, 0, mode,
 	    &zp, cnp->cn_cred, 0 /* flag */, NULL /* vsecattr */);
 	if (rc == 0)
 		*ap->a_vpp = ZTOV(zp);

module/os/freebsd/zfs/zvol_os.c

@@ -311,15 +311,13 @@ zvol_geom_open(struct g_provider *pp, int flag, int count)
 		err = SET_ERROR(EBUSY);
 		goto out_opened;
 	}
-#ifdef FEXCL
-	if (flag & FEXCL) {
+	if (flag & O_EXCL) {
 		if (zv->zv_open_count != 0) {
 			err = SET_ERROR(EBUSY);
 			goto out_opened;
 		}
 		zv->zv_flags |= ZVOL_EXCL;
 	}
-#endif
 
 	zv->zv_open_count += count;
 out_opened:
@@ -952,18 +950,16 @@ zvol_cdev_open(struct cdev *dev, int flags, int fmt, struct thread *td)
 		err = SET_ERROR(EBUSY);
 		goto out_opened;
 	}
-#ifdef FEXCL
-	if (flags & FEXCL) {
+	if (flags & O_EXCL) {
 		if (zv->zv_open_count != 0) {
 			err = SET_ERROR(EBUSY);
 			goto out_opened;
 		}
 		zv->zv_flags |= ZVOL_EXCL;
 	}
-#endif
 
 	zv->zv_open_count++;
-	if (flags & (FSYNC | FDSYNC)) {
+	if (flags & O_SYNC) {
 		zsd = &zv->zv_zso->zso_dev;
 		zsd->zsd_sync_cnt++;
 		if (zsd->zsd_sync_cnt == 1 &&
@@ -1037,7 +1033,7 @@ zvol_cdev_close(struct cdev *dev, int flags, int fmt, struct thread *td)
 	 * You may get multiple opens, but only one close.
 	 */
 	zv->zv_open_count--;
-	if (flags & (FSYNC | FDSYNC)) {
+	if (flags & O_SYNC) {
 		zsd = &zv->zv_zso->zso_dev;
 		zsd->zsd_sync_cnt--;
 	}