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OpenZFS 7301 - zpool export -f should be able to interrupt file freeing 

Authored by: Alek Pinchuk <alek@nexenta.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Sanjay Nadkarni <sanjay.nadkarni@nexenta.com>
Reviewed by: Saso Kiselkov <saso.kiselkov@nexenta.com>
Reviewed by: John Kennedy <john.kennedy@delphix.com>
Approved by: Gordon Ross <gordon.ross@nexenta.com>
Reviewed-by: Tim Chase <tim@chase2k.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: George Melikov <mail@gmelikov.ru>

OpenZFS-issue: https://www.illumos.org/issues/7301
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/eb72182
Closes #5680
This commit is contained in:
George Melikov 2017-01-27 22:46:39 +03:00 committed by Brian Behlendorf
parent cc9bb3e58e
commit a08abc1bb3
4 changed files with 48 additions and 5 deletions
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2
include/sys/zfs_znode.h
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@ -21,6 +21,7 @@
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
* Copyright 2016 Nexenta Systems, Inc. All rights reserved.
*/
#ifndef _SYS_FS_ZFS_ZNODE_H
@ -311,6 +312,7 @@ extern int zfs_sync(struct super_block *, int, cred_t *);
extern dev_t zfs_cmpldev(uint64_t);
extern int zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value);
extern int zfs_get_stats(objset_t *os, nvlist_t *nv);
extern boolean_t zfs_get_vfs_flag_unmounted(objset_t *os);
extern void zfs_znode_dmu_fini(znode_t *);
extern int zfs_inode_alloc(struct super_block *, struct inode **ip);
extern void zfs_inode_destroy(struct inode *);

21
module/zfs/dmu.c
View File

@ -23,7 +23,7 @@
* Copyright (c) 2011, 2016 by Delphix. All rights reserved.
* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
* Copyright (c) 2013, Joyent, Inc. All rights reserved.
* Copyright (c) 2014, Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2016, Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
*/
@ -705,6 +705,22 @@ get_next_chunk(dnode_t *dn, uint64_t *start, uint64_t minimum)
return (0);
}
/*
* If this objset is of type OST_ZFS return true if vfs's unmounted flag is set,
* otherwise return false.
* Used below in dmu_free_long_range_impl() to enable abort when unmounting
*/
/*ARGSUSED*/
static boolean_t
dmu_objset_zfs_unmounting(objset_t *os)
{
#ifdef _KERNEL
if (dmu_objset_type(os) == DMU_OST_ZFS)
return (zfs_get_vfs_flag_unmounted(os));
#endif
return (B_FALSE);
}
static int
dmu_free_long_range_impl(objset_t *os, dnode_t *dn, uint64_t offset,
uint64_t length)
@ -726,6 +742,9 @@ dmu_free_long_range_impl(objset_t *os, dnode_t *dn, uint64_t offset,
uint64_t chunk_end, chunk_begin;
dmu_tx_t *tx;
if (dmu_objset_zfs_unmounting(dn->dn_objset))
return (SET_ERROR(EINTR));
chunk_end = chunk_begin = offset + length;
/* move chunk_begin backwards to the beginning of this chunk */

4
module/zfs/zfs_dir.c
View File

@ -644,8 +644,8 @@ zfs_rmnode(znode_t *zp)
error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END);
if (error) {
/*
* Not enough space. Leave the file in the unlinked
* set.
* Not enough space or we were interrupted by unmount.
* Leave the file in the unlinked set.
*/
zfs_znode_dmu_fini(zp);
return;

26
module/zfs/zfs_vfsops.c
View File

@ -1263,7 +1263,7 @@ EXPORT_SYMBOL(zfs_sb_prune);
/*
* Teardown the zfs_sb_t.
*
* Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock'
* Note, if 'unmounting' is FALSE, we return with the 'z_teardown_lock'
* and 'z_teardown_inactive_lock' held.
*/
int
@ -1358,8 +1358,8 @@ zfs_sb_teardown(zfs_sb_t *zsb, boolean_t unmounting)
*/
if (unmounting) {
zsb->z_unmounted = B_TRUE;
rrm_exit(&zsb->z_teardown_lock, FTAG);
rw_exit(&zsb->z_teardown_inactive_lock);
rrm_exit(&zsb->z_teardown_lock, FTAG);
}
/*
@ -1906,6 +1906,28 @@ zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value)
}
EXPORT_SYMBOL(zfs_get_zplprop);
/*
* Return true if the coresponding vfs's unmounted flag is set.
* Otherwise return false.
* If this function returns true we know VFS unmount has been initiated.
*/
boolean_t
zfs_get_vfs_flag_unmounted(objset_t *os)
{
zfs_sb_t *zfvp;
boolean_t unmounted = B_FALSE;
ASSERT(dmu_objset_type(os) == DMU_OST_ZFS);
mutex_enter(&os->os_user_ptr_lock);
zfvp = dmu_objset_get_user(os);
if (zfvp != NULL && zfvp->z_unmounted)
unmounted = B_TRUE;
mutex_exit(&os->os_user_ptr_lock);
return (unmounted);
}
void
zfs_init(void)
{