Date: Sun, 6 Oct 2019 22:16:00 +0000 (UTC) From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r353151 - in head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs: . sys Message-ID: <201910062216.x96MG070085756@repo.freebsd.org>
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Author: mjg Date: Sun Oct 6 22:16:00 2019 New Revision: 353151 URL: https://svnweb.freebsd.org/changeset/base/353151 Log: zfs: add root vnode caching This replaces the approach added in r338927. See r353150. Sponsored by: The FreeBSD Foundation Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h Sun Oct 6 22:14:32 2019 (r353150) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h Sun Oct 6 22:16:00 2019 (r353151) @@ -46,8 +46,6 @@ struct zfsvfs { zfsvfs_t *z_parent; /* parent fs */ objset_t *z_os; /* objset reference */ uint64_t z_root; /* id of root znode */ - struct vnode *z_rootvnode; /* root vnode */ - struct rmlock z_rootvnodelock;/* protection for root vnode */ uint64_t z_unlinkedobj; /* id of unlinked zapobj */ uint64_t z_max_blksz; /* maximum block size for files */ uint64_t z_fuid_obj; /* fuid table object number */ Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c Sun Oct 6 22:14:32 2019 (r353150) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c Sun Oct 6 22:16:00 2019 (r353151) @@ -65,7 +65,6 @@ #include <sys/spa_boot.h> #include <sys/jail.h> #include <ufs/ufs/quota.h> -#include <sys/rmlock.h> #include "zfs_comutil.h" @@ -93,9 +92,6 @@ static int zfs_version_zpl = ZPL_VERSION; SYSCTL_INT(_vfs_zfs_version, OID_AUTO, zpl, CTLFLAG_RD, &zfs_version_zpl, 0, "ZPL_VERSION"); -static int zfs_root_setvnode(zfsvfs_t *zfsvfs); -static void zfs_root_dropvnode(zfsvfs_t *zfsvfs); - static int zfs_quotactl(vfs_t *vfsp, int cmds, uid_t id, void *arg); static int zfs_mount(vfs_t *vfsp); static int zfs_umount(vfs_t *vfsp, int fflag); @@ -112,7 +108,8 @@ static void zfs_freevfs(vfs_t *vfsp); struct vfsops zfs_vfsops = { .vfs_mount = zfs_mount, .vfs_unmount = zfs_umount, - .vfs_root = zfs_root, + .vfs_root = vfs_cache_root, + .vfs_cachedroot = zfs_root, .vfs_statfs = zfs_statfs, .vfs_vget = zfs_vget, .vfs_sync = zfs_sync, @@ -1213,8 +1210,6 @@ zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, for (int i = 0; i != ZFS_OBJ_MTX_SZ; i++) mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); - rm_init(&zfsvfs->z_rootvnodelock, "zfs root vnode lock"); - error = zfsvfs_init(zfsvfs, os); if (error != 0) { *zfvp = NULL; @@ -1321,8 +1316,6 @@ zfsvfs_free(zfsvfs_t *zfsvfs) rw_enter(&zfsvfs_lock, RW_READER); rw_exit(&zfsvfs_lock); - rm_destroy(&zfsvfs->z_rootvnodelock); - zfs_fuid_destroy(zfsvfs); mutex_destroy(&zfsvfs->z_znodes_lock); @@ -1929,9 +1922,6 @@ zfs_mount(vfs_t *vfsp) error = zfs_domount(vfsp, osname); PICKUP_GIANT(); - if (error == 0) - zfs_root_setvnode((zfsvfs_t *)vfsp->vfs_data); - #ifdef illumos /* * Add an extra VFS_HOLD on our parent vfs so that it can't @@ -2004,65 +1994,14 @@ zfs_statfs(vfs_t *vfsp, struct statfs *statp) } static int -zfs_root_setvnode(zfsvfs_t *zfsvfs) -{ - znode_t *rootzp; - int error; - - ZFS_ENTER(zfsvfs); - error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); - if (error != 0) - panic("could not zfs_zget for root vnode"); - ZFS_EXIT(zfsvfs); - - rm_wlock(&zfsvfs->z_rootvnodelock); - if (zfsvfs->z_rootvnode != NULL) - panic("zfs mount point already has a root vnode: %p\n", - zfsvfs->z_rootvnode); - zfsvfs->z_rootvnode = ZTOV(rootzp); - rm_wunlock(&zfsvfs->z_rootvnodelock); - return (0); -} - -static void -zfs_root_putvnode(zfsvfs_t *zfsvfs) -{ - struct vnode *vp; - - rm_wlock(&zfsvfs->z_rootvnodelock); - vp = zfsvfs->z_rootvnode; - zfsvfs->z_rootvnode = NULL; - rm_wunlock(&zfsvfs->z_rootvnodelock); - if (vp != NULL) - vrele(vp); -} - -static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp) { - struct rm_priotracker tracker; zfsvfs_t *zfsvfs = vfsp->vfs_data; znode_t *rootzp; int error; - rm_rlock(&zfsvfs->z_rootvnodelock, &tracker); - *vpp = zfsvfs->z_rootvnode; - if (*vpp != NULL && (((*vpp)->v_iflag & VI_DOOMED) == 0)) { - vrefact(*vpp); - rm_runlock(&zfsvfs->z_rootvnodelock, &tracker); - goto lock; - } - rm_runlock(&zfsvfs->z_rootvnodelock, &tracker); - - /* - * We found the vnode but did not like it. - */ - if (*vpp != NULL) { - *vpp = NULL; - zfs_root_putvnode(zfsvfs); - } - ZFS_ENTER(zfsvfs); + error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp); if (error == 0) *vpp = ZTOV(rootzp); @@ -2070,7 +2009,6 @@ zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp) ZFS_EXIT(zfsvfs); if (error == 0) { -lock: error = vn_lock(*vpp, flags); if (error != 0) { VN_RELE(*vpp); @@ -2188,8 +2126,6 @@ zfs_umount(vfs_t *vfsp, int fflag) objset_t *os; cred_t *cr = td->td_ucred; int ret; - - zfs_root_putvnode(zfsvfs); ret = secpolicy_fs_unmount(cr, vfsp); if (ret) {
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