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flexfiles: add kerneldoc header to nfs4_ff_layout_prepare_ds 

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Jeff Layton 2016-05-17 12:28:44 -04:00 committed by Anna Schumaker
parent 094069f1d9
commit 95e2b7e95d
1 changed files with 17 additions and 1 deletions
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18
fs/nfs/flexfilelayout/flexfilelayoutdev.c
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@ -343,7 +343,23 @@ out:
return fh;
}
/* Upon return, either ds is connected, or ds is NULL */
/**
* nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call
* @lseg: the layout segment we're operating on
* @ds_idx: index of the DS to use
* @fail_return: return layout on connect failure?
*
* Try to prepare a DS connection to accept an RPC call. This involves
* selecting a mirror to use and connecting the client to it if it's not
* already connected.
*
* Since we only need a single functioning mirror to satisfy a read, we don't
* want to return the layout if there is one. For writes though, any down
* mirror should result in a LAYOUTRETURN. @fail_return is how we distinguish
* between the two cases.
*
* Returns a pointer to a connected DS object on success or NULL on failure.
*/
struct nfs4_pnfs_ds *
nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
bool fail_return)