From: Jan Kara <jack@suse.cz>
To: Christoph Hellwig <hch@infradead.org>
Cc: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>,
viro@ZenIV.linux.org.uk, jack@suse.cz, dedekind1@gmail.com,
richard.weinberger@gmail.com, linux-mtd@lists.infradead.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v3 01/39] fs: introduce a ->s_cdev field into struct super_block
Date: Mon, 5 Oct 2015 10:36:24 +0200 [thread overview]
Message-ID: <20151005083624.GD15529@quack.suse.cz> (raw)
In-Reply-To: <20151004063119.GF28519@infradead.org>
On Sat 03-10-15 23:31:19, Christoph Hellwig wrote:
> On Tue, Sep 15, 2015 at 05:01:56PM +0800, Dongsheng Yang wrote:
> > There are some filesystems are running on char devs, such
> > as ubifs. So we need a field in super_block to hold a
> > reference to the char device.
>
> We only care about the block device to get a device number to return
> in st.st_dev. And while filesystem literally run on top of a block
> device that is not the case of a character device - you might use a
> chardev to identify a device to mount but it'll never use the actual
> char device.
>
> So please don't bloat the superblock with this.
Hum, interesting idea. You're right that using anon bdev ubifs got assigned
in set_anon_super() would work as well. It may be slightly confusing for
quota-tools usage where specifying char device on command line would not
work (specifying block device to identify filesystem works there). But
using mount point would work fine so the situation would be the same as
with network filesystems.
We could even add a translation in quota-tools to convert char device to
corresponding anon block device if there's a reasonably simple way to do
that in userspace or we could translate in quotactl code in kernel if
that's any easier. But currently I don't see a way how we could easily do
either of those.
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2015-10-05 8:36 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-15 9:01 [PATCH v3 00/39] Add quota supporting in ubifs Dongsheng Yang
2015-09-15 9:01 ` Dongsheng Yang
2015-09-15 9:01 ` [PATCH v3 01/39] fs: introduce a ->s_cdev field into struct super_block Dongsheng Yang
2015-09-15 9:01 ` Dongsheng Yang
2015-10-04 6:31 ` Christoph Hellwig
2015-10-05 8:36 ` Jan Kara [this message]
2015-09-15 9:01 ` [PATCH v3 02/39] fs: cleanup: remove the blank line before EXPORT_SYMBOL Dongsheng Yang
2015-09-15 9:01 ` Dongsheng Yang
2015-09-15 9:01 ` [PATCH v3 03/39] fs: super: cleanup: make the comment of each function aligned Dongsheng Yang
2015-09-15 9:01 ` Dongsheng Yang
2015-09-15 9:01 ` [PATCH v3 04/39] fs: super: consolidate the get_super class functions Dongsheng Yang
2015-09-15 9:01 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 05/39] fs: super: introduce a get_super_cdev to get super by a cdev reference Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-10-04 6:32 ` Christoph Hellwig
2015-09-15 9:02 ` [PATCH v3 06/39] fs: super: introduce a get_super_cdev_thawed to get sb by " Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 21:24 ` Jan Kara
2015-09-15 9:02 ` [PATCH v3 07/39] fs: char_dev: introduce cd_acquire function to acquire cdev Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-16 8:16 ` Jan Kara
2015-09-17 3:30 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 08/39] fs: introduce a __lookup_dev for internal using Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 09/39] fs: char_dev: introduce lookup_cdev to get cdev by pathname Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 10/39] fs: dquot: skip invalidate_bdev if bdev is NULL Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 11/39] fs: quota: replace opened calling of ->sync_fs with sync_filesystem Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-16 10:14 ` Jan Kara
2015-09-17 6:28 ` Dongsheng Yang
2015-09-17 6:28 ` Dongsheng Yang
2015-09-17 11:05 ` Jan Kara
2015-09-18 5:49 ` Dongsheng Yang
2015-09-18 9:00 ` Jan Kara
2015-09-21 4:31 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 12/39] fs: quota: make quota support fs which is running on char dev Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 13/39] fs: introduce a get_qsize() to inode_operations Dongsheng Yang
2015-10-04 6:33 ` Christoph Hellwig
2015-10-05 8:01 ` Jan Kara
2015-09-15 9:02 ` [PATCH v3 14/39] fs: quota: restore i_flags of quota files in dquot_disable Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 15/39] fs: quota: introduce a callback of restore_iflags to quotactl_ops Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-16 9:47 ` Jan Kara
2015-09-15 9:02 ` [PATCH v3 16/39] ubi: introduce a interface to get cdev in ubi_volume Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 17/39] ubifs: extend budget for blocks Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 18/39] ubifs: fill sb->s_cdev in ubifs_fill_super() Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 19/39] ubifs: fill ->s_dev in ubifs_fill_super Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 20/39] ubifs: export read_block() from file.c Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 21/39] ubifs: introduce i_dquot to ubifs_inode Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 22/39] ubifs: implement IO functions for quota files Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 23/39] ubifs: disable quota in ubifs_put_super Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 24/39] ubifs: write quota back in ubifs_sync Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 25/39] ubifs: set/clear MS_RDONLY properly in ubifs_remount Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 26/39] ubifs: suspend & resume quota " Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 27/39] ubifs: check inode with NULL before using it Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 28/39] ubifs: record quota information about inode in ubifs_new_inode Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:35 ` Sheng Yong
2015-09-16 1:46 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 29/39] ubifs: free quota inode information in ubifs_evict_inode Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 30/39] ubifs: alloc quota space in ubifs writing path Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 31/39] ubifs: free quota space in do_truncation Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 32/39] ubifs: free quota space when deleting a file Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 33/39] ubifs: adapt quota space informatin in do_setattr Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 34/39] ubifs: transfer quota information in changing owner or group Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 35/39] ubifs: write inode in ubifs_quota_write if we are appending Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 36/39] ubifs: implement ubifs_get_qsize to get quota size in ubifs Dongsheng Yang
2015-09-16 10:00 ` Jan Kara
2015-09-17 7:23 ` Dongsheng Yang
2015-09-17 7:23 ` Dongsheng Yang
2015-09-17 12:00 ` Jan Kara
2015-09-18 6:14 ` Dongsheng Yang
2015-09-18 11:20 ` Jan Kara
2015-09-21 4:35 ` Dongsheng Yang
2015-09-21 9:13 ` Jan Kara
2015-09-21 9:16 ` Dongsheng Yang
2015-09-21 9:44 ` Jan Kara
2015-09-21 11:02 ` Dongsheng Yang
2015-09-23 7:42 ` Jan Kara
2015-09-24 0:50 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 37/39] ubifs: implement ubifs_restore_iflags for quotactl_operations Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 38/39] ubifs: fill the quota related fields in ubifs_fill_super Dongsheng Yang
2015-09-15 9:02 ` [PATCH v3 39/39] ubifs: introduce quota related mount options Dongsheng Yang
2015-09-15 9:02 ` Dongsheng Yang
2015-09-15 9:36 ` Sheng Yong
2015-09-16 1:48 ` Dongsheng Yang
2015-10-03 18:57 ` [PATCH v3 00/39] Add quota supporting in ubifs Richard Weinberger
2015-10-04 2:32 ` Dongsheng Yang
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