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

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Message-Id: <5DA1BF3A-32DC-4969-9C22-DF3DD3CDC89B@gmail.com>
Date:	Fri, 7 Aug 2015 21:11:55 +0300
From:	Alexey Lyashkov <alexey.lyashkov@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Jan Kara <jack@...e.com>, linux-ext4@...r.kernel.org,
	Ted Tso <tytso@....edu>,
	"Darrick J. Wong" <darrick.wong@...cle.com>
Subject: Re: [PATCH 12/19] libext2fs: Bump default number of reserved inodes to 64

It’s correct - i mean about it. 
Same define may used on ext4 code to verify inode number correctness. 


> On Aug 7, 2015, at 2:03 PM, Jan Kara <jack@...e.cz> wrote:
> 
> On Fri 07-08-15 13:58:22, Alexey Lyashkov wrote:
>> May you don’t use a magic constants in code? It hard to maintain latter.
> 
> I guess you mean the default number of reserved inodes. Yes, I guess I can
> create a define for that...
> 
> 								Honza
> 
>>> 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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>> 
> -- 
> Jan Kara <jack@...e.com>
> SUSE Labs, CR

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