The EOF calculation was done on .read_pagelist(), cached
in objlayout_io_state->eof, and set in objlayout_read_done()
into nfs_read_data->res.eof.
So set it directly into nfs_read_data->res.eof and avoid
the extra member.
This is a slight behaviour change because before eof was
*not* set on an error update at objlayout_read_done(). But
is that a problem? Is Generic layer so sensitive that it
will miss the error IO if eof was set? From my testing
I did not see such a problem.
Benny please review.
Which brings me to a more abstract problem. Why does the
LAYOUT driver needs to do this eof calculation? .i.e we
are inspecting generic i_size_read() and if spanned by
offset + count which is received from generic layer we set
eof. It looks like all this can/should be done in generic
layer and not at LD. Where does NFS and files-LD do it?
It looks like it can be promoted.
Signed-off-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
---
fs/nfs/objlayout/objlayout.c | 16 +++++++---------
fs/nfs/objlayout/objlayout.h | 1 -
2 files changed, 7 insertions(+), 10 deletions(-)
diff --git a/fs/nfs/objlayout/objlayout.c b/fs/nfs/objlayout/objlayout.c
index 1d06f8e..1300736 100644
--- a/fs/nfs/objlayout/objlayout.c
+++ b/fs/nfs/objlayout/objlayout.c
@@ -287,17 +287,14 @@ static void _rpc_read_complete(struct work_struct *work)
void
objlayout_read_done(struct objlayout_io_state *state, ssize_t status, bool sync)
{
- int eof = state->eof;
- struct nfs_read_data *rdata;
+ struct nfs_read_data *rdata = state->rpcdata;
state->status = status;
- dprintk("%s: Begin status=%zd eof=%d\n", __func__, status, eof);
- rdata = state->rpcdata;
+ dprintk("%s: Begin status=%zd eof=%d\n", __func__,
+ status, rdata->res.eof);
rdata->task.tk_status = status;
- if (status >= 0) {
+ if (status >= 0)
rdata->res.count = status;
- rdata->res.eof = eof;
- }
objlayout_iodone(state);
/* must not use state after this point */
@@ -330,11 +327,14 @@ objlayout_read_pagelist(struct nfs_read_data *rdata)
status = 0;
rdata->res.count = 0;
rdata->res.eof = 1;
+ /*FIXME: do we need to call pnfs_ld_read_done() */
goto out;
}
count = eof - offset;
}
+ rdata->res.eof = (offset + count) >= eof;
+
state = objlayout_alloc_io_state(NFS_I(rdata->inode)->layout,
rdata->args.pages, rdata->args.pgbase,
offset, count,
@@ -345,8 +345,6 @@ objlayout_read_pagelist(struct nfs_read_data *rdata)
goto out;
}
- state->eof = state->offset + state->count >= eof;
-
status = objio_read_pagelist(state);
out:
dprintk("%s: Return status %Zd\n", __func__, status);
diff --git a/fs/nfs/objlayout/objlayout.h b/fs/nfs/objlayout/objlayout.h
index a8244c8..ffb884c 100644
--- a/fs/nfs/objlayout/objlayout.h
+++ b/fs/nfs/objlayout/objlayout.h
@@ -86,7 +86,6 @@ struct objlayout_io_state {
void *rpcdata;
int status; /* res */
- int eof; /* res */
int committed; /* res */
/* Error reporting (layout_return) */
--
1.7.2.3
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