On Mon, Mar 23, 2009 at 09:20:24PM +0530, Aneesh Kumar K.V wrote:
> On Sat, Feb 28, 2009 at 12:01:52AM -0500, Theodore Ts'o wrote:
> >
> > Add a new superblock value which tracks the lifetime amount of writes
> > to the filesystem. This is useful in estimating the amount of wear on
> > solid state drives (SSD's) caused by writes to the filesystem.
> >
> > Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
> > ---
> > fs/ext4/ext4.h | 3 ++-
> > fs/ext4/ext4_sb.h | 4 ++++
> > fs/ext4/super.c | 7 +++++++
> > 3 files changed, 13 insertions(+), 1 deletions(-)
> >
> > diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> > index 8599e37..f9a3bc3 100644
> > --- a/fs/ext4/ext4.h
> > +++ b/fs/ext4/ext4.h
> > @@ -685,7 +685,8 @@ struct ext4_super_block {
> > __u8 s_log_groups_per_flex; /* FLEX_BG group size */
> > __u8 s_reserved_char_pad2;
> > __le16 s_reserved_pad;
> > - __u32 s_reserved[162]; /* Padding to the end of the block */
> > + __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
> > + __u32 s_reserved[160]; /* Padding to the end of the block */
> > };
> >
> > #ifdef __KERNEL__
> > diff --git a/fs/ext4/ext4_sb.h b/fs/ext4/ext4_sb.h
> > index 4e4d9cc..50ab116 100644
> > --- a/fs/ext4/ext4_sb.h
> > +++ b/fs/ext4/ext4_sb.h
> > @@ -142,6 +142,10 @@ struct ext4_sb_info {
> > /* locality groups */
> > struct ext4_locality_group *s_locality_groups;
> >
> > + /* for write statistics */
> > + unsigned long s_sectors_written_start;
> > + u64 s_kbytes_written;
> > +
> > unsigned int s_log_groups_per_flex;
> > struct flex_groups *s_flex_groups;
> > };
>
> Do we need this change ? We don't seems to be using it anywhere.
>
Looked at the patchqueue and found that you have users in sysfs-support
patch. I guess it would be better if you put this patch after
sysfs-support and moved session_write_kbytes_show and others to this
patch.
-aneesh
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