[PATCH 11/20] fs/jfs: return f_fsid for statfs(2), v2

[PATCH 11/20] fs/jfs: return f_fsid for statfs(2), v2

[Coly Li]

This patch makes jfs return f_fsid info for statfs(2). By Andreas' suggestion, this patch populates
a persistent f_fsid between boots/mounts with help of on-disk uuid record.

Signed-off-by: Coly Li <coly.li@suse.de>
Cc: Dave Kleikamp <shaggy@austin.ibm.com>
---
 fs/jfs/super.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index b37d1f7..6ce1aac 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -29,6 +29,7 @@
 #include <linux/posix_acl.h>
 #include <linux/buffer_head.h>
 #include <linux/exportfs.h>
+#include <linux/crc32.h>
 #include <asm/uaccess.h>
 #include <linux/seq_file.h>

@@ -168,7 +169,10 @@ static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	buf->f_files = maxinodes;
 	buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 				    atomic_read(&imap->im_numfree));
-
+	buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
+	buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
+					sizeof(sbi->uuid)/2);
+	
 	buf->f_namelen = JFS_NAME_MAX;
 	return 0;
 }

-- 
Coly Li
SuSE Labs

Re: [PATCH 11/20] fs/jfs: return f_fsid for statfs(2), v2

[Dave Kleikamp]

One minor nit...

On Tue, 2009-01-20 at 15:06 +0800, Coly Li wrote:
> This patch makes jfs return f_fsid info for statfs(2). By Andreas' suggestion, this patch populates
> a persistent f_fsid between boots/mounts with help of on-disk uuid record.
> 
> Signed-off-by: Coly Li <coly.li@suse.de>

Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>

> ---
>  fs/jfs/super.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/jfs/super.c b/fs/jfs/super.c
> index b37d1f7..6ce1aac 100644
> --- a/fs/jfs/super.c
> +++ b/fs/jfs/super.c
> @@ -29,6 +29,7 @@
>  #include <linux/posix_acl.h>
>  #include <linux/buffer_head.h>
>  #include <linux/exportfs.h>
> +#include <linux/crc32.h>
>  #include <asm/uaccess.h>
>  #include <linux/seq_file.h>
> 
> @@ -168,7 +169,10 @@ static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
>  	buf->f_files = maxinodes;
>  	buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
>  				    atomic_read(&imap->im_numfree));
> -
> +	buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
> +	buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
> +					sizeof(sbi->uuid)/2);
> +	

checkpatch.pl points out a trailing tab here

>  	buf->f_namelen = JFS_NAME_MAX;
>  	return 0;
>  }
> 
-- 
David Kleikamp
IBM Linux Technology Center

Re: [PATCH 11/20] fs/jfs: return f_fsid for statfs(2), v2

[Coly Li]

Dave Kleikamp Wrote:
> One minor nit...
> 
Yeah, if there is no other device preempts major device number, it's almost no difference to
huge_encode_dev() method in common cases. Anyway, using uuid a little better than v1 :)

> On Tue, 2009-01-20 at 15:06 +0800, Coly Li wrote:
>> This patch makes jfs return f_fsid info for statfs(2). By Andreas' suggestion, this patch populates
>> a persistent f_fsid between boots/mounts with help of on-disk uuid record.
>>
>> Signed-off-by: Coly Li <coly.li@suse.de>
> 
> Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
> 
>> ---
>>  fs/jfs/super.c |    6 +++++-
>>  1 files changed, 5 insertions(+), 1 deletions(-)
>>
>> diff --git a/fs/jfs/super.c b/fs/jfs/super.c
>> index b37d1f7..6ce1aac 100644
>> --- a/fs/jfs/super.c
>> +++ b/fs/jfs/super.c
>> @@ -29,6 +29,7 @@
>>  #include <linux/posix_acl.h>
>>  #include <linux/buffer_head.h>
>>  #include <linux/exportfs.h>
>> +#include <linux/crc32.h>
>>  #include <asm/uaccess.h>
>>  #include <linux/seq_file.h>
>>
>> @@ -168,7 +169,10 @@ static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
>>  	buf->f_files = maxinodes;
>>  	buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
>>  				    atomic_read(&imap->im_numfree));
>> -
>> +	buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
>> +	buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
>> +					sizeof(sbi->uuid)/2);
>> +	
> 
> checkpatch.pl points out a trailing tab here
> 
Oops, thanks for pointing out this. I will send out v3 and add your Acked-By in the patch.

Thanks for review.
-- 
Coly Li
SuSE Labs