linux-kernel - Re: [PATCH] exportfs: add FILEID_INVALID to indicate invalid fid

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Message-ID: <CAKYAXd_BNh1FgUoe5k-DJMTs0d-e21zM5Z1R0pbOspyEQ_a7EA@mail.gmail.com>
Date:	Fri, 31 Aug 2012 07:54:29 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	Vivek Trivedi <vtrivedi018@...il.com>
Subject: Re: [PATCH] exportfs: add FILEID_INVALID to indicate invalid fid_type

2012/8/31, J. Bruce Fields <bfields@...ldses.org>:
> On Wed, Aug 29, 2012 at 10:10:10AM -0400, Namjae Jeon wrote:
>> This commit adds FILEID_INVALID = 0xff in fid_type to
>> indicate invalid fid_type
>
> OK, applying for 3.7.
>
> Looks like this shows up in a lot of filesystems too as just "255".  Are
> you planning to patch up the filesystems afterwards?
Hi Bruce.
Yes, I will fix these from next patches.
Thanks.
>
> --b.
>
>>
>> It avoids using magic number 255
>>
>> Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
>> Signed-off-by: Vivek Trivedi <vtrivedi018@...il.com>
>> ---
>>  fs/exportfs/expfs.c      |    4 ++--
>>  fs/fhandle.c             |    2 +-
>>  fs/nfsd/nfsfh.c          |    4 ++--
>>  include/linux/exportfs.h |    5 +++++
>>  4 files changed, 10 insertions(+), 5 deletions(-)
>>
>> diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
>> index 29ab099..f1f1c59 100644
>> --- a/fs/exportfs/expfs.c
>> +++ b/fs/exportfs/expfs.c
>> @@ -322,10 +322,10 @@ static int export_encode_fh(struct inode *inode,
>> struct fid *fid,
>>
>>  	if (parent && (len < 4)) {
>>  		*max_len = 4;
>> -		return 255;
>> +		return FILEID_INVALID;
>>  	} else if (len < 2) {
>>  		*max_len = 2;
>> -		return 255;
>> +		return FILEID_INVALID;
>>  	}
>>
>>  	len = 2;
>> diff --git a/fs/fhandle.c b/fs/fhandle.c
>> index a48e4a1..78a7879 100644
>> --- a/fs/fhandle.c
>> +++ b/fs/fhandle.c
>> @@ -52,7 +52,7 @@ static long do_sys_name_to_handle(struct path *path,
>>  	handle_bytes = handle_dwords * sizeof(u32);
>>  	handle->handle_bytes = handle_bytes;
>>  	if ((handle->handle_bytes > f_handle.handle_bytes) ||
>> -	    (retval == 255) || (retval == -ENOSPC)) {
>> +	    (retval == FILEID_INVALID) || (retval == -ENOSPC)) {
>>  		/* As per old exportfs_encode_fh documentation
>>  		 * we could return ENOSPC to indicate overflow
>>  		 * But file system returned 255 always. So handle
>> diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
>> index 032af38..814afaa 100644
>> --- a/fs/nfsd/nfsfh.c
>> +++ b/fs/nfsd/nfsfh.c
>> @@ -572,7 +572,7 @@ fh_compose(struct svc_fh *fhp, struct svc_export *exp,
>> struct dentry *dentry,
>>
>>  		if (inode)
>>  			_fh_update(fhp, exp, dentry);
>> -		if (fhp->fh_handle.fh_fileid_type == 255) {
>> +		if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) {
>>  			fh_put(fhp);
>>  			return nfserr_opnotsupp;
>>  		}
>> @@ -603,7 +603,7 @@ fh_update(struct svc_fh *fhp)
>>  			goto out;
>>
>>  		_fh_update(fhp, fhp->fh_export, dentry);
>> -		if (fhp->fh_handle.fh_fileid_type == 255)
>> +		if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID)
>>  			return nfserr_opnotsupp;
>>  	}
>>  out:
>> diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h
>> index 12291a7..0e14525 100644
>> --- a/include/linux/exportfs.h
>> +++ b/include/linux/exportfs.h
>> @@ -83,6 +83,11 @@ enum fid_type {
>>  	 * 64 bit parent inode number.
>>  	 */
>>  	FILEID_NILFS_WITH_PARENT = 0x62,
>> +
>> +	/*
>> +	 * Filesystems must not use 0xff file ID.
>> +	 */
>> +	FILEID_INVALID = 0xff,
>>  };
>>
>>  struct fid {
>> --
>> 1.7.9.5
>>
>
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