linux-toradex.git/include/linux/nfs_page.h, branch v3.4.12

NFSv4.1: Clean ups and bugfixes for the pNFS read/writeback/commit code

2012-03-17T15:09:33+00:00

Move more pnfs-isms out of the generic commit code.

Bugfixes:

- filelayout_scan_commit_lists doesn't need to get/put the lseg.
  In fact since it is run under the inode->i_lock, the lseg_put()
  can deadlock.

- Ensure that we distinguish between what needs to be done for
  commit-to-data server and what needs to be done for commit-to-MDS
  using the new flag PG_COMMIT_TO_DS. Otherwise we may end up calling
  put_lseg() on a bucket for a struct nfs_page that got written
  through the MDS.

- Fix a case where we were using list_del() on an nfs_page->wb_list
  instead of list_del_init().

- filelayout_initiate_commit needs to call filelayout_commit_release
  on error instead of the mds_ops->rpc_release(). Otherwise it won't
  clear the commit lock.

Cleanups:

- Let the files layout manage the commit lists for the pNFS case.
  Don't expose stuff like pnfs_choose_commit_list, and the fact
  that the commit buckets hold references to the layout segment
  in common code.

- Cast out the put_lseg() calls for the struct nfs_read/write_data->lseg
  into the pNFS layer from whence they came.

- Let the pNFS layer manage the NFS_INO_PNFS_COMMIT bit.

Signed-off-by: Trond Myklebust 
Cc: Fred Isaman

NFS: remove nfs_inode radix tree

2012-03-10T22:14:10+00:00

The radix tree is only being used to compile lists of reqs needing commit.
It is simpler to just put the reqs directly into a list.

Signed-off-by: Fred Isaman 
Signed-off-by: Trond Myklebust

NFS: remove NFS_PAGE_TAG_LOCKED

2012-03-10T22:13:58+00:00

The last real use of this tag was removed by
commit 7f2f12d963 NFS: Simplify nfs_wb_page()

Signed-off-by: Fred Isaman 
Signed-off-by: Trond Myklebust

NFS: Don't rely on PageError in nfs_readpage_release_partial

2011-10-19T20:58:38+00:00

Don't rely on the PageError flag to tell us if one of the partial reads of
the page failed. Instead, replace that with a dedicated flag in the
struct nfs_page.

Then clean out redundant uses of the PageError flag: the VM no longer
checks it for reads.

Signed-off-by: Trond Myklebust

NFS: Move the pnfs write code into pnfs.c

2011-07-15T13:12:22+00:00

...and ensure that we recoalese to take into account differences in
differences in block sizes when falling back to write through the MDS.

Signed-off-by: Trond Myklebust

NFS: Move the pnfs read code into pnfs.c

2011-07-15T13:12:21+00:00

...and ensure that we recoalese to take into account differences in
block sizes when falling back to read through the MDS.

Signed-off-by: Trond Myklebust

NFS: Allow the nfs_pageio_descriptor to signal that a re-coalesce is needed

2011-07-15T13:12:21+00:00

If an attempt to do pNFS fails, and we have to fall back to writing through
the MDS, then we may want to re-coalesce the requests that we already have
since the block size for the MDS read/writes may be different to that of
the DS read/writes.

Signed-off-by: Trond Myklebust

NFS: Cache rpc_ops in struct nfs_pageio_descriptor

2011-07-15T13:12:20+00:00

Signed-off-by: Trond Myklebust

NFSv4.1: Add an initialisation callback for pNFS

2011-07-12T17:40:28+00:00

Ensure that we always get a layout before setting up the i/o request.

Signed-off-by: Trond Myklebust

NFS: Cleanup of the nfs_pageio code in preparation for a pnfs bugfix

2011-07-12T17:40:28+00:00

We need to ensure that the layouts are set up before we can decide to
coalesce requests. To do so, we want to further split up the struct
nfs_pageio_descriptor operations into an initialisation callback, a
coalescing test callback, and a 'do i/o' callback.

This patch cleans up the existing callback methods before adding the
'initialisation' callback.

Signed-off-by: Trond Myklebust