On Mon, Jul 12, 2010 at 1:19 PM, Benny Halevy <bhalevy@xxxxxxxxxxx> wrote:
> On Jul. 08, 2010, 1:34 +0300, andros@xxxxxxxxxx wrote:
>> From: Andy Adamson <andros@xxxxxxxxxx>
>>
>> Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
>> ---
>> fs/nfs/nfs4proc.c | 2 ++
>> fs/nfs/pnfs.c | 13 +++++++++++++
>> fs/nfs/pnfs.h | 1 +
>> 3 files changed, 16 insertions(+), 0 deletions(-)
>>
>> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
>> index 6acebc3..f763746 100644
>> --- a/fs/nfs/nfs4proc.c
>> +++ b/fs/nfs/nfs4proc.c
>> @@ -5565,6 +5565,8 @@ static void pnfs_layoutcommit_release(void *lcdata)
>> struct pnfs_layoutcommit_data *data =
>> (struct pnfs_layoutcommit_data *)lcdata;
>>
>> + /* Matched by get_layout in pnfs_layoutcommit_inode */
>> + put_layout(data->args.inode);
>> put_rpccred(data->cred);
>> pnfs_layoutcommit_free(lcdata);
>> }
>> diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
>> index aa16e5d..d42c5da 100644
>> --- a/fs/nfs/pnfs.c
>> +++ b/fs/nfs/pnfs.c
>> @@ -354,6 +354,15 @@ put_layout_locked(struct pnfs_layout_type *lo)
>> }
>>
>> void
>> +put_layout(struct inode *inode)
>> +{
>> + spin_lock(&inode->i_lock);
>> + put_layout_locked(NFS_I(inode)->layout);
>> + spin_unlock(&inode->i_lock);
>> +
>> +}
>> +
>> +void
>> pnfs_layout_release(struct pnfs_layout_type *lo,
>> struct nfs4_pnfs_layout_segment *range)
>> {
>> @@ -1598,6 +1607,9 @@ pnfs_layoutcommit_inode(struct inode *inode, int sync)
>> __clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->layout->pnfs_layout_state);
>> pnfs_get_layout_stateid(&data->args.stateid, nfsi->layout);
>>
>> + /* Reference for layoutcommit matched in pnfs_layoutcommit_release */
>> + get_layout(NFS_I(inode)->layout);
>> +
>
> So from the 30000 foot level, I need to remind myself what do
> we need the refcount on the layout hdr (pnfs_layout_type) for?
> Can we really use it detached from the inode? NO
> Is it only for debugging to make catch the case that the inode
> is released while there are references to the layout?
When we migrate the filesystem, we need to reap the nfs_inode->layout
while keeping the nfs_inode.
Same with server reboot, network partition, and use of a different replica.
-->Andy
>
> Benny
>
>> spin_unlock(&inode->i_lock);
>>
>> /* Set up layout commit args */
>> @@ -1606,6 +1618,7 @@ pnfs_layoutcommit_inode(struct inode *inode, int sync)
>> if (status) {
>> /* The layout driver failed to setup the layoutcommit */
>> put_rpccred(data->cred);
>> + put_layout(inode);
>> goto out_free;
>> }
>> status = pnfs4_proc_layoutcommit(data, sync);
>> diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
>> index 9b0fed4..e04b9d4 100644
>> --- a/fs/nfs/pnfs.h
>> +++ b/fs/nfs/pnfs.h
>> @@ -64,6 +64,7 @@ void pnfs_layout_release(struct pnfs_layout_type *, struct nfs4_pnfs_layout_segm
>> void pnfs_set_layout_stateid(struct pnfs_layout_type *lo,
>> const nfs4_stateid *stateid);
>> void pnfs_destroy_layout(struct nfs_inode *);
>> +void put_layout(struct inode *inode);
>>
>> #define PNFS_EXISTS_LDIO_OP(srv, opname) ((srv)->pnfs_curr_ld && \
>> (srv)->pnfs_curr_ld->ld_io_ops && \
>
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