Differential D23042 Diff 66512 head/sys/kern/vfs_vnops.c

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head/sys/kern/vfs_vnops.c

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static fo_rdwr_t vn_io_fault;		static fo_rdwr_t vn_io_fault;
static fo_truncate_t vn_truncate;		static fo_truncate_t vn_truncate;
static fo_ioctl_t vn_ioctl;		static fo_ioctl_t vn_ioctl;
static fo_poll_t vn_poll;		static fo_poll_t vn_poll;
static fo_kqfilter_t vn_kqfilter;		static fo_kqfilter_t vn_kqfilter;
static fo_stat_t vn_statfile;		static fo_stat_t vn_statfile;
static fo_close_t vn_closefile;		static fo_close_t vn_closefile;
static fo_mmap_t vn_mmap;		static fo_mmap_t vn_mmap;
		static fo_fallocate_t vn_fallocate;

struct fileops vnops = {		struct fileops vnops = {
.fo_read = vn_io_fault,		.fo_read = vn_io_fault,
.fo_write = vn_io_fault,		.fo_write = vn_io_fault,
.fo_truncate = vn_truncate,		.fo_truncate = vn_truncate,
.fo_ioctl = vn_ioctl,		.fo_ioctl = vn_ioctl,
.fo_poll = vn_poll,		.fo_poll = vn_poll,
.fo_kqfilter = vn_kqfilter,		.fo_kqfilter = vn_kqfilter,
.fo_stat = vn_statfile,		.fo_stat = vn_statfile,
.fo_close = vn_closefile,		.fo_close = vn_closefile,
.fo_chmod = vn_chmod,		.fo_chmod = vn_chmod,
.fo_chown = vn_chown,		.fo_chown = vn_chown,
.fo_sendfile = vn_sendfile,		.fo_sendfile = vn_sendfile,
.fo_seek = vn_seek,		.fo_seek = vn_seek,
.fo_fill_kinfo = vn_fill_kinfo,		.fo_fill_kinfo = vn_fill_kinfo,
.fo_mmap = vn_mmap,		.fo_mmap = vn_mmap,
		.fo_fallocate = vn_fallocate,
.fo_flags = DFLAG_PASSABLE \| DFLAG_SEEKABLE		.fo_flags = DFLAG_PASSABLE \| DFLAG_SEEKABLE
};		};

static const int io_hold_cnt = 16;		static const int io_hold_cnt = 16;
static int vn_io_fault_enable = 1;		static int vn_io_fault_enable = 1;
SYSCTL_INT(_debug, OID_AUTO, vn_io_fault_enable, CTLFLAG_RW,		SYSCTL_INT(_debug, OID_AUTO, vn_io_fault_enable, CTLFLAG_RW,
&vn_io_fault_enable, 0, "Enable vn_io_fault lock avoidance");		&vn_io_fault_enable, 0, "Enable vn_io_fault lock avoidance");
static int vn_io_fault_prefault = 0;		static int vn_io_fault_prefault = 0;
▲ Show 20 Lines • Show All 3,013 Lines • ▼ Show 20 Lines	while (copylen > 0 && error == 0 && !eof) {
}		}
}		}
xfer = blksize;		xfer = blksize;
}		}
}		}
out:		out:
*lenp = savlen - len;		*lenp = savlen - len;
free(dat, M_TEMP);		free(dat, M_TEMP);
		return (error);
		}

		static int
		vn_fallocate(struct file fp, off_t offset, off_t len, struct thread td)
		{
		struct mount *mp;
		struct vnode *vp;
		off_t olen, ooffset;
		int error;
		#ifdef AUDIT
		int audited_vnode1 = 0;
		#endif

		vp = fp->f_vnode;
		if (vp->v_type != VREG)
		return (ENODEV);

		/* Allocating blocks may take a long time, so iterate. */
		for (;;) {
		olen = len;
		ooffset = offset;

		bwillwrite();
		mp = NULL;
		error = vn_start_write(vp, &mp, V_WAIT \| PCATCH);
		if (error != 0)
		break;
		error = vn_lock(vp, LK_EXCLUSIVE);
		if (error != 0) {
		vn_finished_write(mp);
		break;
		}
		#ifdef AUDIT
		if (!audited_vnode1) {
		AUDIT_ARG_VNODE1(vp);
		audited_vnode1 = 1;
		}
		#endif
		#ifdef MAC
		error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp);
		if (error == 0)
		#endif
		error = VOP_ALLOCATE(vp, &offset, &len);
		VOP_UNLOCK(vp);
		vn_finished_write(mp);

		if (olen + ooffset != offset + len) {
		panic("offset + len changed from %jx/%jx to %jx/%jx",
		ooffset, olen, offset, len);
		}
		if (error != 0 \|\| len == 0)
		break;
		KASSERT(olen > len, ("Iteration did not make progress?"));
		maybe_yield();
		}

return (error);		return (error);
}		}