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freebsd-dev/sys/fs/smbfs/smbfs_vfsops.c
Gleb Smirnoff 756a541279 Allocate pager bufs from UMA instead of 80-ish mutex protected linked list. 
o In vm_pager_bufferinit() create pbuf_zone and start accounting on how many
  pbufs are we going to have set.
  In various subsystems that are going to utilize pbufs create private zones
  via call to pbuf_zsecond_create(). The latter calls uma_zsecond_create(),
  and sets a limit on created zone. After startup preallocate pbufs according
  to requirements of all pbuf zones.

  Subsystems that used to have a private limit with old allocator now have
  private pbuf zones: md(4), fusefs, NFS client, smbfs, VFS cluster, FFS,
  swap, vnode pager.

  The following subsystems use shared pbuf zone: cam(4), nvme(4), physio(9),
  aio(4). They should have their private limits, but changing that is out of
  scope of this commit.

o Fetch tunable value of kern.nswbuf from init_param2() and while here move
  NSWBUF_MIN to opt_param.h and eliminate opt_swap.h, that was holding only
  this option.
  Default values aren't touched by this commit, but they probably should be
  reviewed wrt to modern hardware.

This change removes a tight bottleneck from sendfile(2) operation, that
uses pbufs in vnode pager. Other pagers also would benefit from faster
allocation.

Together with:	gallatin
Tested by:	pho
2019-01-15 01:02:16 +00:00

411 lines
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2000-2001 Boris Popov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/sx.h>
#include <netsmb/smb.h>
#include <netsmb/smb_conn.h>
#include <netsmb/smb_subr.h>
#include <netsmb/smb_dev.h>
#include <fs/smbfs/smbfs.h>
#include <fs/smbfs/smbfs_node.h>
#include <fs/smbfs/smbfs_subr.h>
static int smbfs_debuglevel = 0;
static int smbfs_version = SMBFS_VERSION;
SYSCTL_NODE(_vfs, OID_AUTO, smbfs, CTLFLAG_RW, 0, "SMB/CIFS filesystem");
SYSCTL_INT(_vfs_smbfs, OID_AUTO, version, CTLFLAG_RD, &smbfs_version, 0, "");
SYSCTL_INT(_vfs_smbfs, OID_AUTO, debuglevel, CTLFLAG_RW, &smbfs_debuglevel, 0, "");
static vfs_init_t smbfs_init;
static vfs_uninit_t smbfs_uninit;
static vfs_cmount_t smbfs_cmount;
static vfs_mount_t smbfs_mount;
static vfs_root_t smbfs_root;
static vfs_quotactl_t smbfs_quotactl;
static vfs_statfs_t smbfs_statfs;
static vfs_unmount_t smbfs_unmount;
static struct vfsops smbfs_vfsops = {
.vfs_init = smbfs_init,
.vfs_cmount = smbfs_cmount,
.vfs_mount = smbfs_mount,
.vfs_quotactl = smbfs_quotactl,
.vfs_root = smbfs_root,
.vfs_statfs = smbfs_statfs,
.vfs_sync = vfs_stdsync,
.vfs_uninit = smbfs_uninit,
.vfs_unmount = smbfs_unmount,
};
VFS_SET(smbfs_vfsops, smbfs, VFCF_NETWORK);
MODULE_DEPEND(smbfs, netsmb, NSMB_VERSION, NSMB_VERSION, NSMB_VERSION);
MODULE_DEPEND(smbfs, libiconv, 1, 1, 2);
MODULE_DEPEND(smbfs, libmchain, 1, 1, 1);
uma_zone_t smbfs_pbuf_zone;
static int
smbfs_cmount(struct mntarg *ma, void * data, uint64_t flags)
{
struct smbfs_args args;
int error;
error = copyin(data, &args, sizeof(struct smbfs_args));
if (error)
return error;
if (args.version != SMBFS_VERSION) {
printf("mount version mismatch: kernel=%d, mount=%d\n",
SMBFS_VERSION, args.version);
return EINVAL;
}
ma = mount_argf(ma, "dev", "%d", args.dev);
ma = mount_argb(ma, args.flags & SMBFS_MOUNT_SOFT, "nosoft");
ma = mount_argb(ma, args.flags & SMBFS_MOUNT_INTR, "nointr");
ma = mount_argb(ma, args.flags & SMBFS_MOUNT_STRONG, "nostrong");
ma = mount_argb(ma, args.flags & SMBFS_MOUNT_HAVE_NLS, "nohave_nls");
ma = mount_argb(ma, !(args.flags & SMBFS_MOUNT_NO_LONG), "nolong");
ma = mount_arg(ma, "rootpath", args.root_path, -1);
ma = mount_argf(ma, "uid", "%d", args.uid);
ma = mount_argf(ma, "gid", "%d", args.gid);
ma = mount_argf(ma, "file_mode", "%d", args.file_mode);
ma = mount_argf(ma, "dir_mode", "%d", args.dir_mode);
ma = mount_argf(ma, "caseopt", "%d", args.caseopt);
error = kernel_mount(ma, flags);
return (error);
}
static const char *smbfs_opts[] = {
"fd", "soft", "intr", "strong", "have_nls", "long",
"mountpoint", "rootpath", "uid", "gid", "file_mode", "dir_mode",
"caseopt", "errmsg", NULL
};
static int
smbfs_mount(struct mount *mp)
{
struct smbmount *smp = NULL;
struct smb_vc *vcp;
struct smb_share *ssp = NULL;
struct vnode *vp;
struct thread *td;
struct smb_dev *dev;
struct smb_cred *scred;
int error, v;
char *pc, *pe;
dev = NULL;
td = curthread;
if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
return EOPNOTSUPP;
if (vfs_filteropt(mp->mnt_optnew, smbfs_opts)) {
vfs_mount_error(mp, "%s", "Invalid option");
return (EINVAL);
}
scred = smbfs_malloc_scred();
smb_makescred(scred, td, td->td_ucred);
/* Ask userspace of `fd`, the file descriptor of this session */
if (1 != vfs_scanopt(mp->mnt_optnew, "fd", "%d", &v)) {
vfs_mount_error(mp, "No fd option");
smbfs_free_scred(scred);
return (EINVAL);
}
error = smb_dev2share(v, SMBM_EXEC, scred, &ssp, &dev);
smp = malloc(sizeof(*smp), M_SMBFSDATA, M_WAITOK | M_ZERO);
if (error) {
printf("invalid device handle %d (%d)\n", v, error);
vfs_mount_error(mp, "invalid device handle %d %d\n", v, error);
smbfs_free_scred(scred);
free(smp, M_SMBFSDATA);
return error;
}
vcp = SSTOVC(ssp);
smb_share_unlock(ssp);
mp->mnt_stat.f_iosize = SSTOVC(ssp)->vc_txmax;
mp->mnt_data = smp;
smp->sm_share = ssp;
smp->sm_root = NULL;
smp->sm_dev = dev;
if (1 != vfs_scanopt(mp->mnt_optnew,
"caseopt", "%d", &smp->sm_caseopt)) {
vfs_mount_error(mp, "Invalid caseopt");
error = EINVAL;
goto bad;
}
if (1 != vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v)) {
vfs_mount_error(mp, "Invalid uid");
error = EINVAL;
goto bad;
}
smp->sm_uid = v;
if (1 != vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v)) {
vfs_mount_error(mp, "Invalid gid");
error = EINVAL;
goto bad;
}
smp->sm_gid = v;
if (1 != vfs_scanopt(mp->mnt_optnew, "file_mode", "%d", &v)) {
vfs_mount_error(mp, "Invalid file_mode");
error = EINVAL;
goto bad;
}
smp->sm_file_mode = (v & (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFREG;
if (1 != vfs_scanopt(mp->mnt_optnew, "dir_mode", "%d", &v)) {
vfs_mount_error(mp, "Invalid dir_mode");
error = EINVAL;
goto bad;
}
smp->sm_dir_mode = (v & (S_IRWXU|S_IRWXG|S_IRWXO)) | S_IFDIR;
vfs_flagopt(mp->mnt_optnew,
"nolong", &smp->sm_flags, SMBFS_MOUNT_NO_LONG);
pc = mp->mnt_stat.f_mntfromname;
pe = pc + sizeof(mp->mnt_stat.f_mntfromname);
bzero(pc, MNAMELEN);
*pc++ = '/';
*pc++ = '/';
pc = strchr(strncpy(pc, vcp->vc_username, pe - pc - 2), 0);
if (pc < pe-1) {
*(pc++) = '@';
pc = strchr(strncpy(pc, vcp->vc_srvname, pe - pc - 2), 0);
if (pc < pe - 1) {
*(pc++) = '/';
strncpy(pc, ssp->ss_name, pe - pc - 2);
}
}
vfs_getnewfsid(mp);
error = smbfs_root(mp, LK_EXCLUSIVE, &vp);
if (error) {
vfs_mount_error(mp, "smbfs_root error: %d", error);
goto bad;
}
VOP_UNLOCK(vp, 0);
SMBVDEBUG("root.v_usecount = %d\n", vrefcnt(vp));
#ifdef DIAGNOSTIC
SMBERROR("mp=%p\n", mp);
#endif
smbfs_free_scred(scred);
return error;
bad:
if (ssp)
smb_share_put(ssp, scred);
smbfs_free_scred(scred);
SMB_LOCK();
if (error && smp->sm_dev == dev) {
smp->sm_dev = NULL;
sdp_trydestroy(dev);
}
SMB_UNLOCK();
free(smp, M_SMBFSDATA);
return error;
}
/* Unmount the filesystem described by mp. */
static int
smbfs_unmount(struct mount *mp, int mntflags)
{
struct thread *td;
struct smbmount *smp = VFSTOSMBFS(mp);
struct smb_cred *scred;
struct smb_dev *dev;
int error, flags;
SMBVDEBUG("smbfs_unmount: flags=%04x\n", mntflags);
td = curthread;
flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
/*
* Keep trying to flush the vnode list for the mount while
* some are still busy and we are making progress towards
* making them not busy. This is needed because smbfs vnodes
* reference their parent directory but may appear after their
* parent in the list; one pass over the vnode list is not
* sufficient in this case.
*/
do {
smp->sm_didrele = 0;
/* There is 1 extra root vnode reference from smbfs_mount(). */
error = vflush(mp, 1, flags, td);
} while (error == EBUSY && smp->sm_didrele != 0);
if (error)
return error;
scred = smbfs_malloc_scred();
smb_makescred(scred, td, td->td_ucred);
error = smb_share_lock(smp->sm_share);
if (error)
goto out;
smb_share_put(smp->sm_share, scred);
SMB_LOCK();
dev = smp->sm_dev;
if (!dev)
panic("No private data for mount point");
sdp_trydestroy(dev);
mp->mnt_data = NULL;
SMB_UNLOCK();
free(smp, M_SMBFSDATA);
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_LOCAL;
MNT_IUNLOCK(mp);
out:
smbfs_free_scred(scred);
return error;
}
/*
* Return locked root vnode of a filesystem
*/
static int
smbfs_root(struct mount *mp, int flags, struct vnode **vpp)
{
struct smbmount *smp = VFSTOSMBFS(mp);
struct vnode *vp;
struct smbnode *np;
struct smbfattr fattr;
struct thread *td;
struct ucred *cred;
struct smb_cred *scred;
int error;
td = curthread;
cred = td->td_ucred;
if (smp->sm_root) {
*vpp = SMBTOV(smp->sm_root);
return vget(*vpp, LK_EXCLUSIVE | LK_RETRY, td);
}
scred = smbfs_malloc_scred();
smb_makescred(scred, td, cred);
error = smbfs_smb_lookup(NULL, NULL, 0, &fattr, scred);
if (error)
goto out;
error = smbfs_nget(mp, NULL, NULL, 0, &fattr, &vp);
if (error)
goto out;
ASSERT_VOP_LOCKED(vp, "smbfs_root");
vp->v_vflag |= VV_ROOT;
np = VTOSMB(vp);
smp->sm_root = np;
*vpp = vp;
out:
smbfs_free_scred(scred);
return error;
}
/*
* Do operations associated with quotas, not supported
*/
/* ARGSUSED */
static int
smbfs_quotactl(mp, cmd, uid, arg)
struct mount *mp;
int cmd;
uid_t uid;
void *arg;
{
SMBVDEBUG("return EOPNOTSUPP\n");
return EOPNOTSUPP;
}
/*ARGSUSED*/
int
smbfs_init(struct vfsconf *vfsp)
{
smbfs_pbuf_zone = pbuf_zsecond_create("smbpbuf", nswbuf / 2);
SMBVDEBUG("done.\n");
return 0;
}
/*ARGSUSED*/
int
smbfs_uninit(struct vfsconf *vfsp)
{
uma_zdestroy(smbfs_pbuf_zone);
SMBVDEBUG("done.\n");
return 0;
}
/*
* smbfs_statfs call
*/
int
smbfs_statfs(struct mount *mp, struct statfs *sbp)
{
struct thread *td = curthread;
struct smbmount *smp = VFSTOSMBFS(mp);
struct smbnode *np = smp->sm_root;
struct smb_share *ssp = smp->sm_share;
struct smb_cred *scred;
int error;
if (np == NULL) {
vfs_mount_error(mp, "np == NULL");
return EINVAL;
}
sbp->f_iosize = SSTOVC(ssp)->vc_txmax; /* optimal transfer block size */
scred = smbfs_malloc_scred();
smb_makescred(scred, td, td->td_ucred);
error = smbfs_smb_statfs(ssp, sbp, scred);
smbfs_free_scred(scred);
return (error);
}
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