linux-ext4 - Re: [PATCH 12/19] libext2fs: Bump default number of reserved inodes to 64

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Message-Id: <B63A9BEE-3A2D-4FD3-93E1-AE9C1F9F506C@gmail.com>
Date:	Fri, 7 Aug 2015 13:58:22 +0300
From:	Alexey Lyashkov <alexey.lyashkov@...il.com>
To:	Jan Kara <jack@...e.com>
Cc:	linux-ext4@...r.kernel.org, Ted Tso <tytso@....edu>,
	"Darrick J. Wong" <darrick.wong@...cle.com>,
	Jan Kara <jack@...e.cz>
Subject: Re: [PATCH 12/19] libext2fs: Bump default number of reserved inodes to 64

May you don’t use a magic constants in code? It hard to maintain latter.


> On Aug 7, 2015, at 1:51 PM, Jan Kara <jack@...e.com> wrote:
> 
> From: Jan Kara <jack@...e.cz>
> 
> We ran out of reserved inodes so bump the default number of reserved
> inodes to 64 to get some breathing space. Otherwise we have to do a full
> fs scan when increasing number of reserved inodes when some feature
> needing another reserved inode is enabled. This consumes 13.5 KB on a
> filesystem which is negligible these days.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
> lib/ext2fs/initialize.c | 2 +-
> misc/mke2fs.8.in        | 8 ++++----
> misc/mke2fs.conf.5.in   | 7 ++++---
> 3 files changed, 9 insertions(+), 8 deletions(-)
> 
> diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c
> index 75fbf8ee0061..0ecf4606ce48 100644
> --- a/lib/ext2fs/initialize.c
> +++ b/lib/ext2fs/initialize.c
> @@ -186,7 +186,7 @@ errcode_t ext2fs_initialize(const char *name, int flags,
> 
> 	set_field(s_rev_level, EXT2_GOOD_OLD_REV);
> 	if (super->s_rev_level >= EXT2_DYNAMIC_REV) {
> -		set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
> +		set_field(s_first_ino, 64);
> 		set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE);
> 		if (super->s_inode_size >= sizeof(struct ext2_inode_large)) {
> 			int extra_isize = sizeof(struct ext2_inode_large) -
> diff --git a/misc/mke2fs.8.in b/misc/mke2fs.8.in
> index 520a07185f9f..6eef1d97bfbf 100644
> --- a/misc/mke2fs.8.in
> +++ b/misc/mke2fs.8.in
> @@ -386,10 +386,10 @@ Do not attempt to discard blocks at mkfs time.
> @QUOTA_MAN_COMMENT@...avior is to initialize both user and group quotas.
> .TP
> .BI reserved_inodes= number
> -Specify the number of inodes reserved for system files. This number must be
> -at least 10. Currently 10 is enough but future features may require additional
> -reserved inodes. Reserving more inodes after file system is created requires
> -full file system scan so it can take a long time.
> +Specify the number of inodes reserved for system files. This number must be at
> +least 10, default is 64. Currently 10 is enough but future features may require
> +additional reserved inodes. Reserving more inodes after file system is created
> +requires full file system scan so it can take a long time.
> .RE
> .TP
> .BI \-f " fragment-size"
> diff --git a/misc/mke2fs.conf.5.in b/misc/mke2fs.conf.5.in
> index 06ca9e4eabc4..b35767bfedf2 100644
> --- a/misc/mke2fs.conf.5.in
> +++ b/misc/mke2fs.conf.5.in
> @@ -197,9 +197,10 @@ reserved ratio. This value can be a floating point number.
> .TP
> .I reserved_inodes
> This relation specifies the default number of inodes reserved for system files.
> -The number must be at least 10. Currently 10 is enough but future features may
> -require additional reserved inodes. Reserving more inodes after file system is
> -created requires full file system scan so it can take a long time.
> +The number must be at least 10, default is 64. Currently 10 is enough but
> +future features may require additional reserved inodes. Reserving more inodes
> +after file system is created requires full file system scan so it can take a
> +long time.
> .TP
> .I undo_dir
> This relation specifies the directory where the undo file should be
> -- 
> 2.1.4
> 
> --
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