diff options
Diffstat (limited to 'include/sys/dsl_synctask.h')
| -rw-r--r-- | include/sys/dsl_synctask.h | 41 |
1 files changed, 36 insertions, 5 deletions
diff --git a/include/sys/dsl_synctask.h b/include/sys/dsl_synctask.h index 6139303c1..da6c7a40d 100644 --- a/include/sys/dsl_synctask.h +++ b/include/sys/dsl_synctask.h @@ -20,7 +20,7 @@ */ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2012, 2014 by Delphix. All rights reserved. + * Copyright (c) 2012, 2017 by Delphix. All rights reserved. */ #ifndef _SYS_DSL_SYNCTASK_H @@ -57,14 +57,41 @@ typedef enum zfs_space_check { ZFS_SPACE_CHECK_RESERVED, /* - * No space check is performed. Only operations which we expect to - * result in a net reduction in space should use this - * (e.g. "zfs destroy". Setting quotas & reservations also uses - * this because it needs to circumvent the quota/reservation checks). + * Space check allows use of three quarters of the slop space. + * If there is less than 0.8% free space, the operation will + * fail. + */ + ZFS_SPACE_CHECK_EXTRA_RESERVED, + + /* + * In all cases "zfs destroy" is expected to result in an net + * reduction of space, except one. When the pool has a + * checkpoint, space freed by "zfs destroy" will not actually + * free anything internally. Thus, it starts failing after + * three quarters of the slop space is exceeded. + */ + ZFS_SPACE_CHECK_DESTROY = ZFS_SPACE_CHECK_EXTRA_RESERVED, + + /* + * A channel program can run a "zfs destroy" as part of its + * script and therefore has the same space_check policy when + * being evaluated. + */ + ZFS_SPACE_CHECK_ZCP_EVAL = ZFS_SPACE_CHECK_DESTROY, + + /* + * No space check is performed. This level of space check should + * be used cautiously as operations that use it can even run when + * 0.8% capacity is left for use. In this scenario, if there is a + * checkpoint, async destroys are suspended and any kind of freeing + * can potentially add space instead of freeing it. * * See also the comments above spa_slop_shift. */ ZFS_SPACE_CHECK_NONE, + + ZFS_SPACE_CHECK_DISCARD_CHECKPOINT = ZFS_SPACE_CHECK_NONE, + } zfs_space_check_t; typedef struct dsl_sync_task { @@ -85,6 +112,10 @@ int dsl_sync_task(const char *, dsl_checkfunc_t *, dsl_syncfunc_t *, void *, int, zfs_space_check_t); void dsl_sync_task_nowait(struct dsl_pool *, dsl_syncfunc_t *, void *, int, zfs_space_check_t, dmu_tx_t *); +int dsl_early_sync_task(const char *, dsl_checkfunc_t *, + dsl_syncfunc_t *, void *, int, zfs_space_check_t); +void dsl_early_sync_task_nowait(struct dsl_pool *, dsl_syncfunc_t *, + void *, int, zfs_space_check_t, dmu_tx_t *); #ifdef __cplusplus } |