FreeBSD: Add support for lockless lookup
Authored-by: mjg <mjg@FreeBSD.org> Reviewed-by: Ryan Moeller <ryan@ixsystems.com> Signed-off-by: Matt Macy <mmacy@FreeBSD.org> Closes #10657
This commit is contained in:
Matthew Macy
GitHub
parent
22dcf89181
commit
1b376d176e
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@ -55,6 +55,21 @@
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#else
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#define getnewvnode_reserve_() getnewvnode_reserve(1)
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#endif
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#if __FreeBSD_version < 1300102
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#define ASSERT_VOP_IN_SEQC(zp)
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#define MNTK_FPLOOKUP 0
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#define vn_seqc_write_begin(vp)
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#define vn_seqc_write_end(vp)
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#ifndef VFS_SMR_DECLARE
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#define VFS_SMR_DECLARE
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#endif
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#ifndef VFS_SMR_ZONE_SET
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#define VFS_SMR_ZONE_SET(zone)
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#endif
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#endif
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struct hlist_node {
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struct hlist_node *next, **pprev;
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};
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@ -99,6 +99,7 @@ extern minor_t zfsdev_minor_alloc(void);
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#define ZTOV(ZP) ((ZP)->z_vnode)
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#define ZTOI(ZP) ((ZP)->z_vnode)
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#define VTOZ(VP) ((struct znode *)(VP)->v_data)
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#define VTOZ_SMR(VP) ((znode_t *)vn_load_v_data_smr(VP))
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#define ITOZ(VP) ((struct znode *)(VP)->v_data)
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#define zhold(zp) vhold(ZTOV((zp)))
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#define zrele(zp) vrele(ZTOV((zp)))
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@ -161,6 +161,7 @@ mount_snapshot(kthread_t *td, vnode_t **vpp, const char *fstype, char *fspath,
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vput(vp);
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return (error);
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}
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vn_seqc_write_begin(vp);
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VOP_UNLOCK1(vp);
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/*
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@ -213,6 +214,7 @@ mount_snapshot(kthread_t *td, vnode_t **vpp, const char *fstype, char *fspath,
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VI_LOCK(vp);
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vp->v_iflag &= ~VI_MOUNT;
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VI_UNLOCK(vp);
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vn_seqc_write_end(vp);
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vput(vp);
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vfs_unbusy(mp);
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vfs_freeopts(mp->mnt_optnew);
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@ -248,6 +250,7 @@ mount_snapshot(kthread_t *td, vnode_t **vpp, const char *fstype, char *fspath,
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vfs_event_signal(NULL, VQ_MOUNT, 0);
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if (VFS_ROOT(mp, LK_EXCLUSIVE, &mvp))
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panic("mount: lost mount");
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vn_seqc_write_end(vp);
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VOP_UNLOCK1(vp);
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#if __FreeBSD_version >= 1300048
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vfs_op_exit(mp);
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@ -1144,6 +1144,7 @@ zfs_acl_chown_setattr(znode_t *zp)
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if (zp->z_zfsvfs->z_replay == B_FALSE)
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ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);
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ASSERT(MUTEX_HELD(&zp->z_acl_lock));
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ASSERT_VOP_IN_SEQC(ZTOV(zp));
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if ((error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE)) == 0)
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zp->z_mode = zfs_mode_compute(zp->z_mode, aclp,
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@ -1171,6 +1172,8 @@ zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, dmu_tx_t *tx)
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int count = 0;
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zfs_acl_phys_t acl_phys;
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ASSERT_VOP_IN_SEQC(ZTOV(zp));
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mode = zp->z_mode;
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mode = zfs_mode_compute(mode, aclp, &zp->z_pflags,
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@ -1192,6 +1192,9 @@ zfs_domount(vfs_t *vfsp, char *osname)
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vfsp->mnt_kern_flag |= MNTK_NOMSYNC;
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vfsp->mnt_kern_flag |= MNTK_VMSETSIZE_BUG;
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#if defined(_KERNEL) && !defined(KMEM_DEBUG)
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vfsp->mnt_kern_flag |= MNTK_FPLOOKUP;
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#endif
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/*
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* The fsid is 64 bits, composed of an 8-bit fs type, which
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* separates our fsid from any other filesystem types, and a
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@ -39,6 +39,9 @@
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#include <sys/endian.h>
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#include <sys/vm.h>
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#include <sys/vnode.h>
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#if __FreeBSD_version >= 1300102
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#include <sys/smr.h>
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#endif
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#include <sys/dirent.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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@ -91,6 +94,8 @@
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#define VN_OPEN_INVFS 0x0
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#endif
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VFS_SMR_DECLARE;
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#if __FreeBSD_version >= 1300047
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#define vm_page_wire_lock(pp)
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#define vm_page_wire_unlock(pp)
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@ -3932,6 +3937,7 @@ zfs_rename_(vnode_t *sdvp, vnode_t **svpp, struct componentname *scnp,
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char *snm = scnp->cn_nameptr;
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char *tnm = tcnp->cn_nameptr;
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int error = 0;
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bool want_seqc_end __maybe_unused = false;
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/* Reject renames across filesystems. */
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if ((*svpp)->v_mount != tdvp->v_mount ||
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@ -4075,6 +4081,15 @@ zfs_rename_(vnode_t *sdvp, vnode_t **svpp, struct componentname *scnp,
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}
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}
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vn_seqc_write_begin(*svpp);
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vn_seqc_write_begin(sdvp);
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if (*tvpp != NULL)
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vn_seqc_write_begin(*tvpp);
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if (tdvp != *tvpp)
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vn_seqc_write_begin(tdvp);
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#if __FreeBSD_version >= 1300102
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want_seqc_end = true;
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#endif
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vnevent_rename_src(*svpp, sdvp, scnp->cn_nameptr, ct);
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if (tzp)
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vnevent_rename_dest(*tvpp, tdvp, tnm, ct);
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@ -4161,10 +4176,20 @@ zfs_rename_(vnode_t *sdvp, vnode_t **svpp, struct componentname *scnp,
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unlockout: /* all 4 vnodes are locked, ZFS_ENTER called */
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ZFS_EXIT(zfsvfs);
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if (want_seqc_end) {
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vn_seqc_write_end(*svpp);
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vn_seqc_write_end(sdvp);
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if (*tvpp != NULL)
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vn_seqc_write_end(*tvpp);
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if (tdvp != *tvpp)
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vn_seqc_write_end(tdvp);
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want_seqc_end = false;
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}
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VOP_UNLOCK1(*svpp);
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VOP_UNLOCK1(sdvp);
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out: /* original two vnodes are locked */
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MPASS(!want_seqc_end);
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if (error == 0 && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
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zil_commit(zilog, 0);
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@ -5196,6 +5221,33 @@ zfs_freebsd_write(struct vop_write_args *ap)
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ap->a_cred));
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}
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#if __FreeBSD_version >= 1300102
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/*
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* VOP_FPLOOKUP_VEXEC routines are subject to special circumstances, see
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* the comment above cache_fplookup for details.
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*/
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static int
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zfs_freebsd_fplookup_vexec(struct vop_fplookup_vexec_args *v)
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{
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vnode_t *vp;
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znode_t *zp;
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uint64_t pflags;
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vp = v->a_vp;
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zp = VTOZ_SMR(vp);
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if (__predict_false(zp == NULL))
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return (EAGAIN);
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pflags = atomic_load_64(&zp->z_pflags);
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if (pflags & ZFS_AV_QUARANTINED)
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return (EAGAIN);
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if (pflags & ZFS_XATTR)
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return (EAGAIN);
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if ((pflags & ZFS_NO_EXECS_DENIED) == 0)
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return (EAGAIN);
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return (0);
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}
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#endif
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#ifndef _SYS_SYSPROTO_H_
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struct vop_access_args {
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struct vnode *a_vp;
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@ -6483,6 +6535,9 @@ struct vop_vector zfs_vnodeops = {
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.vop_need_inactive = zfs_freebsd_need_inactive,
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#endif
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.vop_reclaim = zfs_freebsd_reclaim,
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#if __FreeBSD_version >= 1300102
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.vop_fplookup_vexec = zfs_freebsd_fplookup_vexec,
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#endif
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.vop_access = zfs_freebsd_access,
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.vop_allocate = VOP_EINVAL,
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.vop_lookup = zfs_cache_lookup,
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@ -6537,6 +6592,9 @@ VFS_VOP_VECTOR_REGISTER(zfs_vnodeops);
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struct vop_vector zfs_fifoops = {
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.vop_default = &fifo_specops,
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.vop_fsync = zfs_freebsd_fsync,
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#if __FreeBSD_version >= 1300102
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.vop_fplookup_vexec = zfs_freebsd_fplookup_vexec,
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#endif
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.vop_access = zfs_freebsd_access,
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.vop_getattr = zfs_freebsd_getattr,
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.vop_inactive = zfs_freebsd_inactive,
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@ -97,7 +97,13 @@ SYSCTL_INT(_debug_sizeof, OID_AUTO, znode, CTLFLAG_RD,
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*/
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krwlock_t zfsvfs_lock;
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#if defined(_KERNEL) && !defined(KMEM_DEBUG) && \
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__FreeBSD_version >= 1300102
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#define _ZFS_USE_SMR
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static uma_zone_t znode_uma_zone;
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#else
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static kmem_cache_t *znode_cache = NULL;
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#endif
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extern struct vop_vector zfs_vnodeops;
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extern struct vop_vector zfs_fifoops;
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@ -169,6 +175,53 @@ zfs_znode_cache_destructor(void *buf, void *arg)
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ASSERT(zp->z_acl_cached == NULL);
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}
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#ifdef _ZFS_USE_SMR
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VFS_SMR_DECLARE;
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static int
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zfs_znode_cache_constructor_smr(void *mem, int size __unused, void *private,
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int flags)
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{
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return (zfs_znode_cache_constructor(mem, private, flags));
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}
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static void
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zfs_znode_cache_destructor_smr(void *mem, int size __unused, void *private)
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{
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zfs_znode_cache_destructor(mem, private);
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}
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void
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zfs_znode_init(void)
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{
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/*
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* Initialize zcache
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*/
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rw_init(&zfsvfs_lock, NULL, RW_DEFAULT, NULL);
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ASSERT(znode_uma_zone == NULL);
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znode_uma_zone = uma_zcreate("zfs_znode_cache",
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sizeof (znode_t), zfs_znode_cache_constructor_smr,
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zfs_znode_cache_destructor_smr, NULL, NULL, 0, 0);
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VFS_SMR_ZONE_SET(znode_uma_zone);
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}
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static znode_t *
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zfs_znode_alloc_kmem(int flags)
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{
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return (uma_zalloc_smr(znode_uma_zone, flags));
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}
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static void
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zfs_znode_free_kmem(znode_t *zp)
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{
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uma_zfree_smr(znode_uma_zone, zp);
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}
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#else
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void
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zfs_znode_init(void)
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{
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@ -180,18 +233,40 @@ zfs_znode_init(void)
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znode_cache = kmem_cache_create("zfs_znode_cache",
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sizeof (znode_t), 0, zfs_znode_cache_constructor,
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zfs_znode_cache_destructor, NULL, NULL, NULL, 0);
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// kmem_cache_set_move(znode_cache, zfs_znode_move);
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}
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static znode_t *
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zfs_znode_alloc_kmem(int flags)
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{
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return (kmem_cache_alloc(znode_cache, flags));
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}
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static void
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zfs_znode_free_kmem(znode_t *zp)
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{
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kmem_cache_free(znode_cache, zp);
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}
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#endif
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void
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zfs_znode_fini(void)
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{
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/*
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* Cleanup zcache
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*/
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if (znode_cache)
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#ifdef _ZFS_USE_SMR
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if (znode_uma_zone) {
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uma_zdestroy(znode_uma_zone);
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znode_uma_zone = NULL;
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}
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#else
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if (znode_cache) {
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kmem_cache_destroy(znode_cache);
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znode_cache = NULL;
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znode_cache = NULL;
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}
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#endif
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rw_destroy(&zfsvfs_lock);
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}
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@ -211,7 +286,7 @@ zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
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vattr.va_uid = crgetuid(kcred);
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vattr.va_gid = crgetgid(kcred);
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sharezp = kmem_cache_alloc(znode_cache, KM_SLEEP);
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sharezp = zfs_znode_alloc_kmem(KM_SLEEP);
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ASSERT(!POINTER_IS_VALID(sharezp->z_zfsvfs));
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sharezp->z_moved = 0;
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sharezp->z_unlinked = 0;
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@ -230,7 +305,7 @@ zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
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zfs_acl_ids_free(&acl_ids);
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sa_handle_destroy(sharezp->z_sa_hdl);
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kmem_cache_free(znode_cache, sharezp);
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zfs_znode_free_kmem(sharezp);
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return (error);
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}
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@ -349,7 +424,12 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
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int count = 0;
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int error;
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zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
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zp = zfs_znode_alloc_kmem(KM_SLEEP);
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#ifndef _ZFS_USE_SMR
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KASSERT((zfsvfs->z_parent->z_vfs->mnt_kern_flag & MNTK_FPLOOKUP) == 0,
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("%s: fast path lookup enabled without smr", __func__));
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#endif
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#if __FreeBSD_version >= 1300076
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KASSERT(curthread->td_vp_reserved != NULL,
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@ -360,7 +440,7 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
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#endif
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error = getnewvnode("zfs", zfsvfs->z_parent->z_vfs, &zfs_vnodeops, &vp);
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if (error != 0) {
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kmem_cache_free(znode_cache, zp);
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zfs_znode_free_kmem(zp);
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return (NULL);
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}
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zp->z_vnode = vp;
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@ -416,7 +496,7 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
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sa_handle_destroy(zp->z_sa_hdl);
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zfs_vnode_forget(vp);
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zp->z_vnode = NULL;
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kmem_cache_free(znode_cache, zp);
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zfs_znode_free_kmem(zp);
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return (NULL);
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}
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@ -763,6 +843,8 @@ zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
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xoap = xva_getxoptattr(xvap);
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ASSERT(xoap);
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ASSERT_VOP_IN_SEQC(ZTOV(zp));
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if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
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uint64_t times[2];
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ZFS_TIME_ENCODE(&xoap->xoa_createtime, times);
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@ -1191,8 +1273,7 @@ zfs_znode_free(znode_t *zp)
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zp->z_acl_cached = NULL;
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}
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kmem_cache_free(znode_cache, zp);
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zfs_znode_free_kmem(zp);
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}
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void
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@ -1628,7 +1709,7 @@ zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
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zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
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rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
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rootzp = zfs_znode_alloc_kmem(KM_SLEEP);
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ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs));
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rootzp->z_moved = 0;
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rootzp->z_unlinked = 0;
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@ -1672,7 +1753,7 @@ zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
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POINTER_INVALIDATE(&rootzp->z_zfsvfs);
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sa_handle_destroy(rootzp->z_sa_hdl);
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kmem_cache_free(znode_cache, rootzp);
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zfs_znode_free_kmem(rootzp);
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/*
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* Create shares directory
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