pnfsblock: bl_read_pagelist
authorFred Isaman <iisaman@citi.umich.edu>
Sun, 31 Jul 2011 00:52:53 +0000 (20:52 -0400)
committerTrond Myklebust <Trond.Myklebust@netapp.com>
Sun, 31 Jul 2011 16:18:17 +0000 (12:18 -0400)
commit9549ec01b0dcf1c1eb277cba60067236b3f48508
tree5f6aaeaafd088a13cf8369a11ac37367a44c2cde
parentb2be7811dd94816f3df76708c8eb7f55bf7289e2
pnfsblock: bl_read_pagelist

Note: When upper layer's read/write request cannot be fulfilled, the block
layout driver shouldn't silently mark the page as error. It should do
what can be done and  leave the rest to the upper layer. To do so, we
should set rdata/wdata->res.count properly.

When upper layer re-send the read/write request to finish the rest
part of the request, pgbase is the position where we should start at.

[pnfsblock: mark IO error with NFS_LAYOUT_{RW|RO}_FAILED]
Signed-off-by: Peng Tao <peng_tao@emc.com>
[pnfsblock: read path error handling]
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
[pnfsblock: handle errors when read or write pagelist.]
Signed-off-by: Zhang Jingwang <yyalone@gmail.com>
[pnfs-block: use new read_pagelist api]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
fs/nfs/blocklayout/blocklayout.c