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From: Ben Myers <bpm@sgi.com>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-fsdevel@vger.kernel.org, olaf@sgi.com, xfs@oss.sgi.com
Subject: Re: [PATCH 09/16] xfs: add a superblock feature bit to indicate UTF-8 support.
Date: Thu, 9 Oct 2014 10:26:40 -0500	[thread overview]
Message-ID: <20141009152640.GB1865@sgi.com> (raw)
In-Reply-To: <20141006212558.GF2301@dastard>

On Tue, Oct 07, 2014 at 08:25:58AM +1100, Dave Chinner wrote:
> On Fri, Oct 03, 2014 at 04:59:46PM -0500, Ben Myers wrote:
> > From: Olaf Weber <olaf@sgi.com>
> > 
> > When UTF-8 support is enabled, the xfs_dir_ci_inode_operations must be
> > installed. Add xfs_sb_version_hasci(), which tests both the borgbit and
> > the utf8bit, and returns true if at least one of them is set. Replace
> > calls to xfs_sb_version_hasasciici() as needed.
> > 
> > Signed-off-by: Olaf Weber <olaf@sgi.com>
> > ---
> >  fs/xfs/libxfs/xfs_sb.h | 24 +++++++++++++++++++++++-
> >  fs/xfs/xfs_fs.h        |  1 +
> >  fs/xfs/xfs_fsops.c     |  4 +++-
> >  fs/xfs/xfs_iops.c      |  4 ++--
> >  4 files changed, 29 insertions(+), 4 deletions(-)
> > 
> > diff --git a/fs/xfs/libxfs/xfs_sb.h b/fs/xfs/libxfs/xfs_sb.h
> > index 2e73970..525eacb 100644
> > --- a/fs/xfs/libxfs/xfs_sb.h
> > +++ b/fs/xfs/libxfs/xfs_sb.h
> > @@ -70,6 +70,7 @@ struct xfs_trans;
> >  #define XFS_SB_VERSION2_RESERVED4BIT	0x00000004
> >  #define XFS_SB_VERSION2_ATTR2BIT	0x00000008	/* Inline attr rework */
> >  #define XFS_SB_VERSION2_PARENTBIT	0x00000010	/* parent pointers */
> > +#define XFS_SB_VERSION2_UTF8BIT		0x00000020      /* utf8 names */
> >  #define XFS_SB_VERSION2_PROJID32BIT	0x00000080	/* 32 bit project id */
> 
> Can you explain why this bit is safe to use?

I believe Olaf chose this value to match what was used in Barry's
implementation.

> I don't recall why
> XFS_SB_VERSION2_PROJID32BIT skipped several bits because there
> aren't any comments explaining why that value was chosen. Adding a
> comment about the 0x00000040 bit at the same time would be useful.

I'm not sure why we skipped.  I'll see what I can find in mail archives.

-Ben

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  reply	other threads:[~2014-10-09 15:26 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-03 21:47 [RFC v3] Unicode/UTF-8 support for XFS Ben Myers
2014-10-03 21:50 ` [PATCH 01/16] lib: add unicode character database files Ben Myers
2014-10-03 21:51 ` [PATCH 02/16] scripts: add trie generator for UTF-8 Ben Myers
2014-10-03 21:54 ` [PATCH 03/16] lib: add supporting code " Ben Myers
2014-10-03 21:54 ` [PATCH 04/16] lib/utf8norm.c: reduce the size of utf8data[] Ben Myers
2014-10-05 21:52   ` Dave Chinner
2014-10-05 21:52     ` Dave Chinner
2014-10-03 21:55 ` [PATCH 05/16] xfs: return the first match during case-insensitive lookup Ben Myers
2014-10-06 22:19   ` Dave Chinner
2014-10-09 15:42     ` Ben Myers
2014-10-09 20:38       ` Dave Chinner
2014-10-09 20:38         ` Dave Chinner
2014-10-14 15:04         ` Ben Myers
2014-10-14 15:04           ` Ben Myers
2014-10-03 21:56 ` [PATCH 06/16] xfs: rename XFS_CMP_CASE to XFS_CMP_MATCH Ben Myers
2014-10-03 21:58 ` [PATCH 07/16] xfs: add xfs_nameops.normhash Ben Myers
2014-10-03 21:58 ` [PATCH 08/16] xfs: change interface of xfs_nameops.hashname Ben Myers
2014-10-06 22:17   ` Dave Chinner
2014-10-06 22:17     ` Dave Chinner
2014-10-14 15:34     ` Ben Myers
2014-10-03 21:59 ` [PATCH 09/16] xfs: add a superblock feature bit to indicate UTF-8 support Ben Myers
2014-10-06 21:25   ` Dave Chinner
2014-10-09 15:26     ` Ben Myers [this message]
2014-10-03 22:00 ` [PATCH 10/16] xfs: store utf8version in the superblock Ben Myers
2014-10-06 21:53   ` Dave Chinner
2014-10-06 21:53     ` Dave Chinner
2014-10-03 22:01 ` [PATCH 11/16] xfs: add xfs_nameops for utf8 and utf8+casefold Ben Myers
2014-10-06 22:10   ` Dave Chinner
2014-10-06 22:10     ` Dave Chinner
2014-10-03 22:03 ` [PATCH 12/16] xfs: apply utf-8 normalization rules to user extended attribute names Ben Myers
2014-10-03 22:03 ` [PATCH 13/16] xfs: implement demand load of utf8norm.ko Ben Myers
2014-10-04  7:16   ` Christoph Hellwig
2014-10-04  7:16     ` Christoph Hellwig
2014-10-09 15:19     ` Ben Myers
2014-10-03 22:04 ` [PATCH 14/16] xfs: rename XFS_IOC_FSGEOM to XFS_IOC_FSGEOM_V2 Ben Myers
2014-10-06 20:33   ` Dave Chinner
2014-10-06 20:33     ` Dave Chinner
2014-10-06 20:38     ` Ben Myers
2014-10-03 22:05 ` [PATCH 15/16] xfs: xfs_fs_geometry returns a number of bytes to copy Ben Myers
2014-10-06 20:41   ` Dave Chinner
2014-10-06 20:41     ` Dave Chinner
2014-10-03 22:05 ` [PATCH 16/16] xfs: add versioned fsgeom ioctl with utf8version field Ben Myers
2014-10-06 21:13   ` Dave Chinner
2014-10-06 21:13     ` Dave Chinner
2014-10-03 22:06 ` [PATCH 17/35] xfsprogs: add unicode character database files Ben Myers
2014-10-03 22:07 ` [PATCH 18/35] xfsprogs: add trie generator for UTF-8 Ben Myers
2014-10-03 22:07 ` [PATCH 19/35] xfsprogs: add supporting code " Ben Myers
2014-10-03 22:08 ` [PATCH 20/35] xfsprogs: reduce the size of utf8data[] Ben Myers
2014-10-03 22:09 ` [PATCH 21/35] libxfs: return the first match during case-insensitive lookup Ben Myers
2014-10-03 22:09 ` [PATCH 22/35] libxfs: rename XFS_CMP_CASE to XFS_CMP_MATCH Ben Myers
2014-10-03 22:10 ` [PATCH 23/35] libxfs: add xfs_nameops.normhash Ben Myers
2014-10-03 22:11 ` [PATCH 24/35] libxfs: change interface of xfs_nameops.hashname Ben Myers
2014-10-03 22:11 ` [PATCH 25/35] libxfs: add a superblock feature bit to indicate UTF-8 support Ben Myers
2014-10-03 22:12 ` [PATCH 26/35] libxfs: store utf8version in the superblock Ben Myers
2014-10-03 22:13 ` [PATCH 27/35] libxfs: add xfs_nameops for utf8 and utf8+casefold Ben Myers
2014-10-03 22:13 ` [PATCH 28/35] libxfs: apply utf-8 normalization rules to user extended attribute names Ben Myers
2014-10-03 22:14 ` [PATCH 29/35] libxfs: rename XFS_IOC_FSGEOM to XFS_IOC_FSGEOM_V2 Ben Myers
2014-10-03 22:14 ` [PATCH 30/35] libxfs: add versioned fsgeom ioctl with utf8version field Ben Myers
2014-10-03 22:15 ` [PATCH 31/35] xfsprogs: add utf8 support to growfs Ben Myers
2014-10-03 22:15 ` [PATCH 32/35] xfsprogs: add utf8 support to mkfs.xfs Ben Myers
2014-10-03 22:16 ` [PATCH 33/35] xfsprogs: add utf8 support to xfs_repair Ben Myers
2014-10-03 22:16 ` [PATCH 34/35] xfsprogs: xfs_db support for sb_utf8version Ben Myers
2014-10-03 22:17 ` [PATCH 35/35] xfsprogs: add a test for utf8 support Ben Myers

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