TXFS_MODIFY_RM structure (winioctl.h)
[Microsoft strongly recommends developers utilize alternative means to achieve your application’s needs. Many scenarios that TxF was developed for can be achieved through simpler and more readily available techniques. Furthermore, TxF may not be available in future versions of Microsoft Windows. For more information, and alternatives to TxF, please see Alternatives to using Transactional NTFS.]
Contains the information required when modifying log parameters and logging mode for a secondary resource manager.
Syntax
typedef struct _TXFS_MODIFY_RM {
DWORD Flags;
DWORD LogContainerCountMax;
DWORD LogContainerCountMin;
DWORD LogContainerCount;
DWORD LogGrowthIncrement;
DWORD LogAutoShrinkPercentage;
DWORDLONG Reserved;
WORD LoggingMode;
} TXFS_MODIFY_RM, *PTXFS_MODIFY_RM;
Members
Flags
The log parameters to be set.
This member can be one or more of the following values.
| Value | Meaning |
|---|---|
|
If this flag is set, the LoggingMode member of this structure is being used. If the flag is not set, the LoggingMode member is ignored. |
|
If this flag is set, the RM is instructed to rename itself (creating a new GUID). |
|
If this flag is set, the LogContainerCountMax member is being used. If the flag is not set, the LogContainerCountMax member is ignored. This flag is mutually exclusive with TXFS_RM_FLAG_LOG_NO_CONTAINER_COUNT_MIN. |
|
If this flag is set, the LogContainerCountMin member is being used. If the flag is not set, the LogContainerCountMin member is ignored. This flag is mutually exclusive with TXFS_RM_FLAG_LOG_NO_CONTAINER_COUNT_MAX. |
|
If this flag is set, the LogGrowthIncrement member is being used. If the flag is not set, the LogGrowthIncrement member is ignored. This flag indicates that the log should grow by the number of containers specified in the LogGrowthIncrement member. This flag is mutually exclusive with TXFS_RM_FLAG_LOG_GROWTH_INCREMENT_PERCENT. |
|
If this flag is set, the LogGrowthIncrement member is being used. If the flag is not set, the LogGrowthIncrement member is ignored. This flag indicates that the log should grow by the percentage of the log size specified in the LogGrowthIncrement member. This flag is mutually exclusive with TXFS_RM_FLAG_LOG_GROWTH_INCREMENT_NUM_CONTAINERS. |
|
If this flag is set, the LogAutoShrinkPercentage member is being used. If the flag is not set, the LogAutoShrinkPercentage is ignored. |
|
If this flag is set, the RM is instructed to allow its log to grow without bounds. This flag is mutually exclusive with TXFS_RM_FLAG_LOG_NO_CONTAINER_COUNT_MIN. |
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If this flag is set, the RM is instructed to allow its log to shrink the log to only two containers. This flag is mutually exclusive with TXFS_RM_FLAG_LOG_NO_CONTAINER_COUNT_MAX. |
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If this flag is set, the log is instructed to immediately increase its size to the size specified in LogContainerCount. If the flag is not set, the LogContainerCount is ignored. |
|
If this flag is set, the log is instructed to immediately decrease its size to the size specified in LogContainerCount. If this flag and TXFS_RM_FLAG_ENFORCE_MINIMUM_SIZE are set, the log is instructed to shrink to its minimum allowable size, and LogContainerCount is ignored. |
|
If this flag and TXFS_RM_FLAG_SHRINK_LOG are set, the log is instructed to shrink to its minimum allowable size, and LogContainerCount is ignored. If this flag is set, the TXFS_RM_FLAG_SHRINK_LOG must be set. |
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If this flag is set, the log is instructed to preserve the changes on disk. If this flag is not set, any changes made are temporary (that is, until the RM is shut down and restarted). |
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This flag is only valid for default RMs, not secondary RMs. If this flag is set, the RM is instructed to reset itself the next time it is started. The log and the associated metadata are deleted. |
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This flag is only valid for default RMs, not secondary RMs. If this flag is set, a previous call to FSCTL_TXFS_MODIFY_RM is canceled with the TXFS_RM_FLAG_RESET_RM_AT_NEXT_START flag set. |
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Indicates that the RM is to prefer transaction consistency over system availability. This flag is mutually exclusive with TXFS_RM_FLAG_PREFER_AVAILABILITY and is not supported by the default RM on the system volume. |
|
Indicates that the RM is to prefer system availability over transaction consistency. This flag is mutually exclusive with TXFS_RM_FLAG_PREFER_CONSISTENCY and is forced by the default RM on the system volume. |
LogContainerCountMax
The maximum size of the log, in containers.
LogContainerCountMin
The minimum size of the log, in containers.
LogContainerCount
The actual size of the log, in containers.
LogGrowthIncrement
The number of containers or percentage of space that should be added to the log.
LogAutoShrinkPercentage
The percentage of log space to keep free. This member is used when the TXFS_RM_FLAG_LOG_AUTO_SHRINK_PERCENTAGE flag is used, and instructs the log to automatically shrink itself, so no more than LogAutoShrinkPercentage of the log is free at any given time.
Reserved
Reserved.
LoggingMode
The current logging mode.
| Value | Meaning |
|---|---|
|
Simple logging is used. |
|
Full logging is used |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Vista [desktop apps only] |
| Minimum supported server | Windows Server 2008 [desktop apps only] |
| Header | winioctl.h (include Windows.h) |