@@ -1403,19 +1403,19 @@ pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *r
{
u64 rd_size = req->wb_bytes;
- WARN_ON_ONCE(pgio->pg_lseg != NULL);
-
- if (pgio->pg_dreq == NULL)
- rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
- else
- rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
-
- pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
- req->wb_context,
- req_offset(req),
- rd_size,
- IOMODE_READ,
- GFP_KERNEL);
+ if (pgio->pg_lseg == NULL) {
+ if (pgio->pg_dreq == NULL)
+ rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
+ else
+ rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
+
+ pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
+ req->wb_context,
+ req_offset(req),
+ rd_size,
+ IOMODE_READ,
+ GFP_KERNEL);
+ }
/* If no lseg, fall back to read through mds */
if (pgio->pg_lseg == NULL)
nfs_pageio_reset_read_mds(pgio);
@@ -1427,14 +1427,13 @@ void
pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req, u64 wb_size)
{
- WARN_ON_ONCE(pgio->pg_lseg != NULL);
-
- pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
- req->wb_context,
- req_offset(req),
- wb_size,
- IOMODE_RW,
- GFP_NOFS);
+ if (pgio->pg_lseg == NULL)
+ pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
+ req->wb_context,
+ req_offset(req),
+ wb_size,
+ IOMODE_RW,
+ GFP_NOFS);
/* If no lseg, fall back to write through mds */
if (pgio->pg_lseg == NULL)
nfs_pageio_reset_write_mds(pgio);
This is a note to let you know that I have just added a patch titled nfs41: .init_read and .init_write can be called with valid pg_lseg to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue This patch is scheduled to be released in version 3.16.7-ckt8. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.16.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From 6184a5e071e36e45549aafc8f8eb530177ac750f Mon Sep 17 00:00:00 2001 From: Peng Tao <tao.peng@primarydata.com> Date: Sat, 24 Jan 2015 22:14:52 +0800 Subject: nfs41: .init_read and .init_write can be called with valid pg_lseg commit cb5d04bc39e914124e811ea55f3034d2379a5f6c upstream. With pgio refactoring in v3.15, .init_read and .init_write can be called with valid pgio->pg_lseg. file layout was fixed at that time by commit c6194271f (pnfs: filelayout: support non page aligned layouts). But the generic helper still needs to be fixed. Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- fs/nfs/pnfs.c | 41 ++++++++++++++++++++--------------------- 1 file changed, 20 insertions(+), 21 deletions(-)