=============
- ====================== ============================================================
- background_gc=%s Turn on/off cleaning operations, namely garbage
- collection, triggered in background when I/O subsystem is
- idle. If background_gc=on, it will turn on the garbage
- collection and if background_gc=off, garbage collection
- will be turned off. If background_gc=sync, it will turn
- on synchronous garbage collection running in background.
- Default value for this option is on. So garbage
- collection is on by default.
- disable_roll_forward Disable the roll-forward recovery routine
- norecovery Disable the roll-forward recovery routine, mounted read-
- only (i.e., -o ro,disable_roll_forward)
- discard/nodiscard Enable/disable real-time discard in f2fs, if discard is
- enabled, f2fs will issue discard/TRIM commands when a
- segment is cleaned.
- no_heap Disable heap-style segment allocation which finds free
- segments for data from the beginning of main area, while
- for node from the end of main area.
- nouser_xattr Disable Extended User Attributes. Note: xattr is enabled
- by default if CONFIG_F2FS_FS_XATTR is selected.
- noacl Disable POSIX Access Control List. Note: acl is enabled
- by default if CONFIG_F2FS_FS_POSIX_ACL is selected.
- active_logs=%u Support configuring the number of active logs. In the
- current design, f2fs supports only 2, 4, and 6 logs.
- Default number is 6.
- disable_ext_identify Disable the extension list configured by mkfs, so f2fs
- does not aware of cold files such as media files.
- inline_xattr Enable the inline xattrs feature.
- noinline_xattr Disable the inline xattrs feature.
- inline_xattr_size=%u Support configuring inline xattr size, it depends on
- flexible inline xattr feature.
- inline_data Enable the inline data feature: New created small(<~3.4k)
- files can be written into inode block.
- inline_dentry Enable the inline dir feature: data in new created
- directory entries can be written into inode block. The
- space of inode block which is used to store inline
- dentries is limited to ~3.4k.
- noinline_dentry Disable the inline dentry feature.
- flush_merge Merge concurrent cache_flush commands as much as possible
- to eliminate redundant command issues. If the underlying
- device handles the cache_flush command relatively slowly,
- recommend to enable this option.
- nobarrier This option can be used if underlying storage guarantees
- its cached data should be written to the novolatile area.
- If this option is set, no cache_flush commands are issued
- but f2fs still guarantees the write ordering of all the
- data writes.
- fastboot This option is used when a system wants to reduce mount
- time as much as possible, even though normal performance
- can be sacrificed.
- extent_cache Enable an extent cache based on rb-tree, it can cache
- as many as extent which map between contiguous logical
- address and physical address per inode, resulting in
- increasing the cache hit ratio. Set by default.
- noextent_cache Disable an extent cache based on rb-tree explicitly, see
- the above extent_cache mount option.
- noinline_data Disable the inline data feature, inline data feature is
- enabled by default.
- data_flush Enable data flushing before checkpoint in order to
- persist data of regular and symlink.
- reserve_root=%d Support configuring reserved space which is used for
- allocation from a privileged user with specified uid or
- gid, unit: 4KB, the default limit is 0.2% of user blocks.
- resuid=%d The user ID which may use the reserved blocks.
- resgid=%d The group ID which may use the reserved blocks.
- fault_injection=%d Enable fault injection in all supported types with
- specified injection rate.
- fault_type=%d Support configuring fault injection type, should be
- enabled with fault_injection option, fault type value
- is shown below, it supports single or combined type.
+ ======================== ============================================================
+ background_gc=%s Turn on/off cleaning operations, namely garbage
+ collection, triggered in background when I/O subsystem is
+ idle. If background_gc=on, it will turn on the garbage
+ collection and if background_gc=off, garbage collection
+ will be turned off. If background_gc=sync, it will turn
+ on synchronous garbage collection running in background.
+ Default value for this option is on. So garbage
+ collection is on by default.
+ disable_roll_forward Disable the roll-forward recovery routine
+ norecovery Disable the roll-forward recovery routine, mounted read-
+ only (i.e., -o ro,disable_roll_forward)
+ discard/nodiscard Enable/disable real-time discard in f2fs, if discard is
+ enabled, f2fs will issue discard/TRIM commands when a
+ segment is cleaned.
+ no_heap Disable heap-style segment allocation which finds free
+ segments for data from the beginning of main area, while
+ for node from the end of main area.
+ nouser_xattr Disable Extended User Attributes. Note: xattr is enabled
+ by default if CONFIG_F2FS_FS_XATTR is selected.
+ noacl Disable POSIX Access Control List. Note: acl is enabled
+ by default if CONFIG_F2FS_FS_POSIX_ACL is selected.
+ active_logs=%u Support configuring the number of active logs. In the
+ current design, f2fs supports only 2, 4, and 6 logs.
+ Default number is 6.
+ disable_ext_identify Disable the extension list configured by mkfs, so f2fs
+ does not aware of cold files such as media files.
+ inline_xattr Enable the inline xattrs feature.
+ noinline_xattr Disable the inline xattrs feature.
+ inline_xattr_size=%u Support configuring inline xattr size, it depends on
+ flexible inline xattr feature.
+ inline_data Enable the inline data feature: New created small(<~3.4k)
+ files can be written into inode block.
+ inline_dentry Enable the inline dir feature: data in new created
+ directory entries can be written into inode block. The
+ space of inode block which is used to store inline
+ dentries is limited to ~3.4k.
+ noinline_dentry Disable the inline dentry feature.
+ flush_merge Merge concurrent cache_flush commands as much as possible
+ to eliminate redundant command issues. If the underlying
+ device handles the cache_flush command relatively slowly,
+ recommend to enable this option.
+ nobarrier This option can be used if underlying storage guarantees
+ its cached data should be written to the novolatile area.
+ If this option is set, no cache_flush commands are issued
+ but f2fs still guarantees the write ordering of all the
+ data writes.
+ fastboot This option is used when a system wants to reduce mount
+ time as much as possible, even though normal performance
+ can be sacrificed.
+ extent_cache Enable an extent cache based on rb-tree, it can cache
+ as many as extent which map between contiguous logical
+ address and physical address per inode, resulting in
+ increasing the cache hit ratio. Set by default.
+ noextent_cache Disable an extent cache based on rb-tree explicitly, see
+ the above extent_cache mount option.
+ noinline_data Disable the inline data feature, inline data feature is
+ enabled by default.
+ data_flush Enable data flushing before checkpoint in order to
+ persist data of regular and symlink.
+ reserve_root=%d Support configuring reserved space which is used for
+ allocation from a privileged user with specified uid or
+ gid, unit: 4KB, the default limit is 0.2% of user blocks.
+ resuid=%d The user ID which may use the reserved blocks.
+ resgid=%d The group ID which may use the reserved blocks.
+ fault_injection=%d Enable fault injection in all supported types with
+ specified injection rate.
+ fault_type=%d Support configuring fault injection type, should be
+ enabled with fault_injection option, fault type value
+ is shown below, it supports single or combined type.
- =================== ===========
- Type_Name Type_Value
- =================== ===========
- FAULT_KMALLOC 0x000000001
- FAULT_KVMALLOC 0x000000002
- FAULT_PAGE_ALLOC 0x000000004
- FAULT_PAGE_GET 0x000000008
- FAULT_ALLOC_BIO 0x000000010
- FAULT_ALLOC_NID 0x000000020
- FAULT_ORPHAN 0x000000040
- FAULT_BLOCK 0x000000080
- FAULT_DIR_DEPTH 0x000000100
- FAULT_EVICT_INODE 0x000000200
- FAULT_TRUNCATE 0x000000400
- FAULT_READ_IO 0x000000800
- FAULT_CHECKPOINT 0x000001000
- FAULT_DISCARD 0x000002000
- FAULT_WRITE_IO 0x000004000
- =================== ===========
- mode=%s Control block allocation mode which supports "adaptive"
- and "lfs". In "lfs" mode, there should be no random
- writes towards main area.
- io_bits=%u Set the bit size of write IO requests. It should be set
- with "mode=lfs".
- usrquota Enable plain user disk quota accounting.
- grpquota Enable plain group disk quota accounting.
- prjquota Enable plain project quota accounting.
- usrjquota=<file> Appoint specified file and type during mount, so that quota
- grpjquota=<file> information can be properly updated during recovery flow,
- prjjquota=<file> <quota file>: must be in root directory;
- jqfmt=<quota type> <quota type>: [vfsold,vfsv0,vfsv1].
- offusrjquota Turn off user journelled quota.
- offgrpjquota Turn off group journelled quota.
- offprjjquota Turn off project journelled quota.
- quota Enable plain user disk quota accounting.
- noquota Disable all plain disk quota option.
- whint_mode=%s Control which write hints are passed down to block
- layer. This supports "off", "user-based", and
- "fs-based". In "off" mode (default), f2fs does not pass
- down hints. In "user-based" mode, f2fs tries to pass
- down hints given by users. And in "fs-based" mode, f2fs
- passes down hints with its policy.
- alloc_mode=%s Adjust block allocation policy, which supports "reuse"
- and "default".
- fsync_mode=%s Control the policy of fsync. Currently supports "posix",
- "strict", and "nobarrier". In "posix" mode, which is
- default, fsync will follow POSIX semantics and does a
- light operation to improve the filesystem performance.
- In "strict" mode, fsync will be heavy and behaves in line
- with xfs, ext4 and btrfs, where xfstest generic/342 will
- pass, but the performance will regress. "nobarrier" is
- based on "posix", but doesn't issue flush command for
- non-atomic files likewise "nobarrier" mount option.
+ =================== ===========
+ Type_Name Type_Value
+ =================== ===========
+ FAULT_KMALLOC 0x000000001
+ FAULT_KVMALLOC 0x000000002
+ FAULT_PAGE_ALLOC 0x000000004
+ FAULT_PAGE_GET 0x000000008
+ FAULT_ALLOC_BIO 0x000000010
+ FAULT_ALLOC_NID 0x000000020
+ FAULT_ORPHAN 0x000000040
+ FAULT_BLOCK 0x000000080
+ FAULT_DIR_DEPTH 0x000000100
+ FAULT_EVICT_INODE 0x000000200
+ FAULT_TRUNCATE 0x000000400
+ FAULT_READ_IO 0x000000800
+ FAULT_CHECKPOINT 0x000001000
+ FAULT_DISCARD 0x000002000
+ FAULT_WRITE_IO 0x000004000
+ =================== ===========
+ mode=%s Control block allocation mode which supports "adaptive"
+ and "lfs". In "lfs" mode, there should be no random
+ writes towards main area.
+ io_bits=%u Set the bit size of write IO requests. It should be set
+ with "mode=lfs".
+ usrquota Enable plain user disk quota accounting.
+ grpquota Enable plain group disk quota accounting.
+ prjquota Enable plain project quota accounting.
+ usrjquota=<file> Appoint specified file and type during mount, so that quota
+ grpjquota=<file> information can be properly updated during recovery flow,
+ prjjquota=<file> <quota file>: must be in root directory;
+ jqfmt=<quota type> <quota type>: [vfsold,vfsv0,vfsv1].
+ offusrjquota Turn off user journelled quota.
+ offgrpjquota Turn off group journelled quota.
+ offprjjquota Turn off project journelled quota.
+ quota Enable plain user disk quota accounting.
+ noquota Disable all plain disk quota option.
+ whint_mode=%s Control which write hints are passed down to block
+ layer. This supports "off", "user-based", and
+ "fs-based". In "off" mode (default), f2fs does not pass
+ down hints. In "user-based" mode, f2fs tries to pass
+ down hints given by users. And in "fs-based" mode, f2fs
+ passes down hints with its policy.
+ alloc_mode=%s Adjust block allocation policy, which supports "reuse"
+ and "default".
+ fsync_mode=%s Control the policy of fsync. Currently supports "posix",
+ "strict", and "nobarrier". In "posix" mode, which is
+ default, fsync will follow POSIX semantics and does a
+ light operation to improve the filesystem performance.
+ In "strict" mode, fsync will be heavy and behaves in line
+ with xfs, ext4 and btrfs, where xfstest generic/342 will
+ pass, but the performance will regress. "nobarrier" is
+ based on "posix", but doesn't issue flush command for
+ non-atomic files likewise "nobarrier" mount option.
test_dummy_encryption
test_dummy_encryption=%s
- Enable dummy encryption, which provides a fake fscrypt
- context. The fake fscrypt context is used by xfstests.
- The argument may be either "v1" or "v2", in order to
- select the corresponding fscrypt policy version.
- checkpoint=%s[:%u[%]] Set to "disable" to turn off checkpointing. Set to "enable"
- to reenable checkpointing. Is enabled by default. While
- disabled, any unmounting or unexpected shutdowns will cause
- the filesystem contents to appear as they did when the
- filesystem was mounted with that option.
- While mounting with checkpoint=disabled, the filesystem must
- run garbage collection to ensure that all available space can
- be used. If this takes too much time, the mount may return
- EAGAIN. You may optionally add a value to indicate how much
- of the disk you would be willing to temporarily give up to
- avoid additional garbage collection. This can be given as a
- number of blocks, or as a percent. For instance, mounting
- with checkpoint=disable:100% would always succeed, but it may
- hide up to all remaining free space. The actual space that
- would be unusable can be viewed at /sys/fs/f2fs/<disk>/unusable
- This space is reclaimed once checkpoint=enable.
- compress_algorithm=%s Control compress algorithm, currently f2fs supports "lzo",
- "lz4", "zstd" and "lzo-rle" algorithm.
- compress_log_size=%u Support configuring compress cluster size, the size will
- be 4KB * (1 << %u), 16KB is minimum size, also it's
- default size.
- compress_extension=%s Support adding specified extension, so that f2fs can enable
- compression on those corresponding files, e.g. if all files
- with '.ext' has high compression rate, we can set the '.ext'
- on compression extension list and enable compression on
- these file by default rather than to enable it via ioctl.
- For other files, we can still enable compression via ioctl.
- inlinecrypt
- When possible, encrypt/decrypt the contents of encrypted
- files using the blk-crypto framework rather than
- filesystem-layer encryption. This allows the use of
- inline encryption hardware. The on-disk format is
- unaffected. For more details, see
- Documentation/block/inline-encryption.rst.
- ====================== ============================================================
+ Enable dummy encryption, which provides a fake fscrypt
+ context. The fake fscrypt context is used by xfstests.
+ The argument may be either "v1" or "v2", in order to
+ select the corresponding fscrypt policy version.
+ checkpoint=%s[:%u[%]] Set to "disable" to turn off checkpointing. Set to "enable"
+ to reenable checkpointing. Is enabled by default. While
+ disabled, any unmounting or unexpected shutdowns will cause
+ the filesystem contents to appear as they did when the
+ filesystem was mounted with that option.
+ While mounting with checkpoint=disabled, the filesystem must
+ run garbage collection to ensure that all available space can
+ be used. If this takes too much time, the mount may return
+ EAGAIN. You may optionally add a value to indicate how much
+ of the disk you would be willing to temporarily give up to
+ avoid additional garbage collection. This can be given as a
+ number of blocks, or as a percent. For instance, mounting
+ with checkpoint=disable:100% would always succeed, but it may
+ hide up to all remaining free space. The actual space that
+ would be unusable can be viewed at /sys/fs/f2fs/<disk>/unusable
+ This space is reclaimed once checkpoint=enable.
+ compress_algorithm=%s Control compress algorithm, currently f2fs supports "lzo",
+ "lz4", "zstd" and "lzo-rle" algorithm.
+ compress_log_size=%u Support configuring compress cluster size, the size will
+ be 4KB * (1 << %u), 16KB is minimum size, also it's
+ default size.
+ compress_extension=%s Support adding specified extension, so that f2fs can enable
+ compression on those corresponding files, e.g. if all files
+ with '.ext' has high compression rate, we can set the '.ext'
+ on compression extension list and enable compression on
+ these file by default rather than to enable it via ioctl.
+ For other files, we can still enable compression via ioctl.
++inlinecrypt When possible, encrypt/decrypt the contents of encrypted
++ files using the blk-crypto framework rather than
++ filesystem-layer encryption. This allows the use of
++ inline encryption hardware. The on-disk format is
++ unaffected. For more details, see
++ Documentation/block/inline-encryption.rst.
+ ======================== ============================================================
Debugfs Entries
===============
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