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OpenZFS 7180 - potential race between zfs_suspend_fs+zfs_resume_fs and zfs_ioc_rename 

Authored by: Andriy Gapon <andriy.gapon@clusterhq.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: George Melikov <mail@gmelikov.ru>

OpenZFS-issue: https://www.illumos.org/issues/7180
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/690041b
Closes #5627
This commit is contained in:
George Melikov 2017-01-23 21:53:46 +03:00 committed by Brian Behlendorf
parent cffd6e1167
commit ec923db25c
3 changed files with 18 additions and 11 deletions
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2
include/sys/zfs_vfsops.h
View File

@ -181,7 +181,7 @@ typedef struct zfid_long {
extern uint_t zfs_fsyncer_key;
extern int zfs_suspend_fs(zfs_sb_t *zsb);
extern int zfs_resume_fs(zfs_sb_t *zsb, const char *osname);
extern int zfs_resume_fs(zfs_sb_t *zsb, struct dsl_dataset *ds);
extern int zfs_userspace_one(zfs_sb_t *zsb, zfs_userquota_prop_t type,
const char *domain, uint64_t rid, uint64_t *valuep);
extern int zfs_userspace_many(zfs_sb_t *zsb, zfs_userquota_prop_t type,

14
module/zfs/zfs_ioctl.c
View File

@ -3645,12 +3645,15 @@ zfs_ioc_rollback(const char *fsname, nvlist_t *args, nvlist_t *outnvl)
int error;
if (get_zfs_sb(fsname, &zsb) == 0) {
dsl_dataset_t *ds;
ds = dmu_objset_ds(zsb->z_os);
error = zfs_suspend_fs(zsb);
if (error == 0) {
int resume_err;
error = dsl_dataset_rollback(fsname, zsb, outnvl);
resume_err = zfs_resume_fs(zsb, fsname);
resume_err = zfs_resume_fs(zsb, ds);
error = error ? error : resume_err;
}
deactivate_super(zsb->z_sb);
@ -4248,8 +4251,10 @@ zfs_ioc_recv_impl(char *tofs, char *tosnap, char *origin,
if (get_zfs_sb(tofs, &zsb) == 0) {
/* online recv */
dsl_dataset_t *ds;
int end_err;
ds = dmu_objset_ds(zsb->z_os);
error = zfs_suspend_fs(zsb);
/*
* If the suspend fails, then the recv_end will
@ -4257,7 +4262,7 @@ zfs_ioc_recv_impl(char *tofs, char *tosnap, char *origin,
*/
end_err = dmu_recv_end(&drc, zsb);
if (error == 0)
error = zfs_resume_fs(zsb, tofs);
error = zfs_resume_fs(zsb, ds);
error = error ? error : end_err;
deactivate_super(zsb->z_sb);
} else if ((zv = zvol_suspend(tofs)) != NULL) {
@ -4944,11 +4949,14 @@ 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(zsb->z_os);
error = zfs_suspend_fs(zsb);
if (error == 0) {
dmu_objset_refresh_ownership(zsb->z_os,
zsb);
error = zfs_resume_fs(zsb, zc->zc_name);
error = zfs_resume_fs(zsb, ds);
}
}
if (error == 0)

13
module/zfs/zfs_vfsops.c
View File

@ -1710,7 +1710,7 @@ EXPORT_SYMBOL(zfs_suspend_fs);
* Reopen zfs_sb_t and release VFS ops.
*/
int
zfs_resume_fs(zfs_sb_t *zsb, const char *osname)
zfs_resume_fs(zfs_sb_t *zsb, dsl_dataset_t *ds)
{
int err, err2;
znode_t *zp;
@ -1720,13 +1720,12 @@ zfs_resume_fs(zfs_sb_t *zsb, const char *osname)
ASSERT(RW_WRITE_HELD(&zsb->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.
*/
VERIFY0(dmu_objset_hold(osname, zsb, &zsb->z_os));
VERIFY3P(zsb->z_os->os_dsl_dataset->ds_owner, ==, zsb);
VERIFY(dsl_dataset_long_held(zsb->z_os->os_dsl_dataset));
dmu_objset_rele(zsb->z_os, zsb);
VERIFY3P(ds->ds_owner, ==, zsb);
VERIFY(dsl_dataset_long_held(ds));
VERIFY0(dmu_objset_from_ds(ds, &zsb->z_os));
/*
* Make sure version hasn't changed