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Date:   Fri, 20 Nov 2020 11:15:56 -0800
From:   Harshad Shirwadkar <harshadshirwadkar@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     tytso@....edu, Harshad Shirwadkar <harshadshirwadkar@...il.com>
Subject: [PATCH 05/15] mke2fs, tune2fs: update man page with fast commit info

This patch adds information about fast commit feature in mke2fs and
tune2fs man pages.

Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>
---
 misc/mke2fs.8.in  | 21 +++++++++++++++++++++
 misc/tune2fs.8.in | 25 +++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/misc/mke2fs.8.in b/misc/mke2fs.8.in
index e6bfc6d6..2833b408 100644
--- a/misc/mke2fs.8.in
+++ b/misc/mke2fs.8.in
@@ -521,6 +521,27 @@ The size of the journal must be at least 1024 filesystem blocks
 and may be no more than 10,240,000 filesystem blocks or half the total
 file system size (whichever is smaller)
 .TP
+.BI fast_commit_size= fast-commit-size
+Create an additional fast commit journal area of size
+.I fast-commit-size
+kilobytes.
+This option is only valid if
+.B fast_commit
+feature is enabled
+on the file system. If this option is not specified and if
+.B fast_commit
+feature is turned on, fast commit area size defaults to
+.I journal-size
+/ 64 megabytes. The total size of the journal with
+.B fast_commit
+feature set is
+.I journal-size
++ (
+.I fast-commit-size
+* 1024) megabytes. The total journal size may be no more than
+10,240,000 filesystem blocks or half the total file system size
+(whichever is smaller).
+.TP
 .BI location =journal-location
 Specify the location of the journal.  The argument
 .I journal-location
diff --git a/misc/tune2fs.8.in b/misc/tune2fs.8.in
index 582d1da5..2114c623 100644
--- a/misc/tune2fs.8.in
+++ b/misc/tune2fs.8.in
@@ -357,6 +357,27 @@ and may be no more than 10,240,000 filesystem blocks.
 There must be enough free space in the filesystem to create a journal of
 that size.
 .TP
+.BI fast_commit_size= fast-commit-size
+Create an additional fast commit journal area of size
+.I fast-commit-size
+kilobytes.
+This option is only valid if
+.B fast_commit
+feature is enabled
+on the file system. If this option is not specified and if
+.B fast_commit
+feature is turned on, fast commit area size defaults to
+.I journal-size
+/ 64 megabytes. The total size of the journal with
+.B fast_commit
+feature set is
+.I journal-size
++ (
+.I fast-commit-size
+* 1024) megabytes. The total journal size may be no more than
+10,240,000 filesystem blocks or half the total file system size
+(whichever is smaller).
+.TP
 .BI location =journal-location
 Specify the location of the journal.  The argument
 .I journal-location
@@ -586,6 +607,10 @@ Setting the filesystem feature is equivalent to using the
 .B \-j
 option.
 .TP
+.TP
+.B fast_commit
+Enable fast commit journaling feature to improve fsync latency.
+.TP
 .B large_dir
 Increase the limit on the number of files per directory.
 .B Tune2fs
-- 
2.29.2.454.gaff20da3a2-goog

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