Commit f5fa7c8b authored by Hridya Valsaraju's avatar Hridya Valsaraju Committed by Jaegeuk Kim

f2fs: delete duplicate information on sysfs nodes

This patch merges the sysfs node documentation present in
Documentation/filesystems/f2fs.txt and
Documentation/ABI/testing/sysfs-fs-f2fs
and deletes the duplicate information from
Documentation/filesystems/f2fs.txt. This is to prevent having to update
both files when a new sysfs node is added for f2fs.
The patch also makes minor formatting changes to
Documentation/ABI/testing/sysfs-fs-f2fs.
Signed-off-by: default avatarHridya Valsaraju <hridya@google.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent fb24fea7
This diff is collapsed.
...@@ -270,172 +270,6 @@ The files in each per-device directory are shown in table below. ...@@ -270,172 +270,6 @@ The files in each per-device directory are shown in table below.
Files in /sys/fs/f2fs/<devname> Files in /sys/fs/f2fs/<devname>
(see also Documentation/ABI/testing/sysfs-fs-f2fs) (see also Documentation/ABI/testing/sysfs-fs-f2fs)
..............................................................................
File Content
gc_urgent_sleep_time This parameter controls sleep time for gc_urgent.
500 ms is set by default. See above gc_urgent.
gc_min_sleep_time This tuning parameter controls the minimum sleep
time for the garbage collection thread. Time is
in milliseconds.
gc_max_sleep_time This tuning parameter controls the maximum sleep
time for the garbage collection thread. Time is
in milliseconds.
gc_no_gc_sleep_time This tuning parameter controls the default sleep
time for the garbage collection thread. Time is
in milliseconds.
gc_idle This parameter controls the selection of victim
policy for garbage collection. Setting gc_idle = 0
(default) will disable this option. Setting
gc_idle = 1 will select the Cost Benefit approach
& setting gc_idle = 2 will select the greedy approach.
gc_urgent This parameter controls triggering background GCs
urgently or not. Setting gc_urgent = 0 [default]
makes back to default behavior, while if it is set
to 1, background thread starts to do GC by given
gc_urgent_sleep_time interval.
reclaim_segments This parameter controls the number of prefree
segments to be reclaimed. If the number of prefree
segments is larger than the number of segments
in the proportion to the percentage over total
volume size, f2fs tries to conduct checkpoint to
reclaim the prefree segments to free segments.
By default, 5% over total # of segments.
main_blkaddr This value gives the first block address of
MAIN area in the partition.
max_small_discards This parameter controls the number of discard
commands that consist small blocks less than 2MB.
The candidates to be discarded are cached until
checkpoint is triggered, and issued during the
checkpoint. By default, it is disabled with 0.
discard_granularity This parameter controls the granularity of discard
command size. It will issue discard commands iif
the size is larger than given granularity. Its
unit size is 4KB, and 4 (=16KB) is set by default.
The maximum value is 128 (=512KB).
reserved_blocks This parameter indicates the number of blocks that
f2fs reserves internally for root.
batched_trim_sections This parameter controls the number of sections
to be trimmed out in batch mode when FITRIM
conducts. 32 sections is set by default.
ipu_policy This parameter controls the policy of in-place
updates in f2fs. User can set:
0x01: F2FS_IPU_FORCE, 0x02: F2FS_IPU_SSR,
0x04: F2FS_IPU_UTIL, 0x08: F2FS_IPU_SSR_UTIL,
0x10: F2FS_IPU_FSYNC, 0x20: F2FS_IPU_ASYNC,
0x40: F2FS_IPU_NOCACHE.
Refer segment.h for details.
min_ipu_util This parameter controls the threshold to trigger
in-place-updates. The number indicates percentage
of the filesystem utilization, and used by
F2FS_IPU_UTIL and F2FS_IPU_SSR_UTIL policies.
min_fsync_blocks This parameter controls the threshold to trigger
in-place-updates when F2FS_IPU_FSYNC mode is set.
The number indicates the number of dirty pages
when fsync needs to flush on its call path. If
the number is less than this value, it triggers
in-place-updates.
min_seq_blocks This parameter controls the threshold to serialize
write IOs issued by multiple threads in parallel.
min_hot_blocks This parameter controls the threshold to allocate
a hot data log for pending data blocks to write.
min_ssr_sections This parameter adds the threshold when deciding
SSR block allocation. If this is large, SSR mode
will be enabled early.
ram_thresh This parameter controls the memory footprint used
by free nids and cached nat entries. By default,
1 is set, which indicates 10 MB / 1 GB RAM.
ra_nid_pages When building free nids, F2FS reads NAT blocks
ahead for speed up. Default is 0.
dirty_nats_ratio Given dirty ratio of cached nat entries, F2FS
determines flushing them in background.
max_victim_search This parameter controls the number of trials to
find a victim segment when conducting SSR and
cleaning operations. The default value is 4096
which covers 8GB block address range.
migration_granularity For large-sized sections, F2FS can stop GC given
this granularity instead of reclaiming entire
section.
dir_level This parameter controls the directory level to
support large directory. If a directory has a
number of files, it can reduce the file lookup
latency by increasing this dir_level value.
Otherwise, it needs to decrease this value to
reduce the space overhead. The default value is 0.
cp_interval F2FS tries to do checkpoint periodically, 60 secs
by default.
idle_interval F2FS detects system is idle, if there's no F2FS
operations during given interval, 5 secs by
default.
discard_idle_interval F2FS detects the discard thread is idle, given
time interval. Default is 5 secs.
gc_idle_interval F2FS detects the GC thread is idle, given time
interval. Default is 5 secs.
umount_discard_timeout When unmounting the disk, F2FS waits for finishing
queued discard commands which can take huge time.
This gives time out for it, 5 secs by default.
iostat_enable This controls to enable/disable iostat in F2FS.
readdir_ra This enables/disabled readahead of inode blocks
in readdir, and default is enabled.
gc_pin_file_thresh This indicates how many GC can be failed for the
pinned file. If it exceeds this, F2FS doesn't
guarantee its pinning state. 2048 trials is set
by default.
extension_list This enables to change extension_list for hot/cold
files in runtime.
inject_rate This controls injection rate of arbitrary faults.
inject_type This controls injection type of arbitrary faults.
dirty_segments This shows # of dirty segments.
lifetime_write_kbytes This shows # of data written to the disk.
features This shows current features enabled on F2FS.
current_reserved_blocks This shows # of blocks currently reserved.
unusable If checkpoint=disable, this shows the number of
blocks that are unusable.
If checkpoint=enable it shows the number of blocks
that would be unusable if checkpoint=disable were
to be set.
encoding This shows the encoding used for casefolding.
If casefolding is not enabled, returns (none)
================================================================================ ================================================================================
USAGE USAGE
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