From 1625821302ba692391bedcdc28a9d41c58b545f5 Mon Sep 17 00:00:00 2001 From: avg Date: Sat, 24 Dec 2016 14:13:21 +0000 Subject: [PATCH] MFC r309097: MFV r308987: 7180 potential race between zfs_suspend_fs+zfs_resume_fs and zfs_ioc_rename git-svn-id: svn://svn.freebsd.org/base/stable/10@310510 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- .../opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h | 2 +- .../opensolaris/uts/common/fs/zfs/zfs_ioctl.c | 14 +++++++++++--- .../opensolaris/uts/common/fs/zfs/zfs_vfsops.c | 13 ++++++------- 3 files changed, 18 insertions(+), 11 deletions(-) diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h index df5ce05b1..bcf22cdb9 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_vfsops.h @@ -142,7 +142,7 @@ extern uint_t zfs_fsyncer_key; extern int zfs_super_owner; extern int zfs_suspend_fs(zfsvfs_t *zfsvfs); -extern int zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname); +extern int zfs_resume_fs(zfsvfs_t *zfsvfs, struct dsl_dataset *ds); extern int zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, const char *domain, uint64_t rid, uint64_t *valuep); extern int zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type, diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c index 52b9c8353..0e2ba7748 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c @@ -3788,12 +3788,15 @@ zfs_ioc_rollback(const char *fsname, nvlist_t *args, nvlist_t *outnvl) int error; if (getzfsvfs(fsname, &zfsvfs) == 0) { + dsl_dataset_t *ds; + + ds = dmu_objset_ds(zfsvfs->z_os); error = zfs_suspend_fs(zfsvfs); if (error == 0) { int resume_err; error = dsl_dataset_rollback(fsname, zfsvfs, outnvl); - resume_err = zfs_resume_fs(zfsvfs, fsname); + resume_err = zfs_resume_fs(zfsvfs, ds); error = error ? error : resume_err; } #ifdef illumos @@ -4444,8 +4447,10 @@ zfs_ioc_recv(zfs_cmd_t *zc) if (getzfsvfs(tofs, &zfsvfs) == 0) { /* online recv */ + dsl_dataset_t *ds; int end_err; + ds = dmu_objset_ds(zfsvfs->z_os); error = zfs_suspend_fs(zfsvfs); /* * If the suspend fails, then the recv_end will @@ -4453,7 +4458,7 @@ zfs_ioc_recv(zfs_cmd_t *zc) */ end_err = dmu_recv_end(&drc, zfsvfs); if (error == 0) - error = zfs_resume_fs(zfsvfs, tofs); + error = zfs_resume_fs(zfsvfs, ds); error = error ? error : end_err; #ifdef illumos VFS_RELE(zfsvfs->z_vfs); @@ -4999,11 +5004,14 @@ zfs_ioc_userspace_upgrade(zfs_cmd_t *zc) * objset needs to be closed & reopened (to grow the * objset_phys_t). Suspend/resume the fs will do that. */ + dsl_dataset_t *ds; + + ds = dmu_objset_ds(zfsvfs->z_os); error = zfs_suspend_fs(zfsvfs); if (error == 0) { dmu_objset_refresh_ownership(zfsvfs->z_os, zfsvfs); - error = zfs_resume_fs(zfsvfs, zc->zc_name); + error = zfs_resume_fs(zfsvfs, ds); } } if (error == 0) diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c index bae4d8a98..2a9e7ab13 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c @@ -2226,7 +2226,7 @@ zfs_suspend_fs(zfsvfs_t *zfsvfs) * zfsvfs, held, and long held on entry. */ int -zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname) +zfs_resume_fs(zfsvfs_t *zfsvfs, dsl_dataset_t *ds) { int err; znode_t *zp; @@ -2235,14 +2235,13 @@ zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname) ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)); /* - * We already own this, so just hold and rele it to update the - * objset_t, as the one we had before may have been evicted. + * We already own this, so just update the objset_t, as the one we + * had before may have been evicted. */ objset_t *os; - VERIFY0(dmu_objset_hold(osname, zfsvfs, &os)); - VERIFY3P(os->os_dsl_dataset->ds_owner, ==, zfsvfs); - VERIFY(dsl_dataset_long_held(os->os_dsl_dataset)); - dmu_objset_rele(os, zfsvfs); + VERIFY3P(ds->ds_owner, ==, zfsvfs); + VERIFY(dsl_dataset_long_held(ds)); + VERIFY0(dmu_objset_from_ds(ds, &os)); err = zfsvfs_init(zfsvfs, os); if (err != 0) -- 2.45.0