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pnfs-obj: Return PNFS_NOT_ATTEMPTED in case of read/write_pagelist

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objlayout driver was always returning PNFS_ATTEMPTED from it's
read/write_pagelist operations. Even on error. Fix that.

Start by establishing an error return API from io-engine, by
not returning ssize_t (length-or-error) but returning "int"
0=OK, 0>Error. And clean up all return types in io-engine.

Then if io-engine returned error return PNFS_NOT_ATTEMPTED
to generic layer. (With a dprint)

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Boaz Harrosh 2011-10-31 14:45:46 -07:00 committed by Trond Myklebust
parent 4cdc685c7d
commit e6c40fe3f4
3 changed files with 37 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
fs/nfs/objlayout/objio_osd.c
View File

@ -142,7 +142,7 @@ OBJIO_LSEG(struct pnfs_layout_segment *lseg)
}
struct objio_state;
typedef ssize_t (*objio_done_fn)(struct objio_state *ios);
typedef int (*objio_done_fn)(struct objio_state *ios);
struct objio_state {
/* Generic layer */
@ -720,7 +720,7 @@ out:
return 0;
}
static ssize_t _sync_done(struct objio_state *ios)
static int _sync_done(struct objio_state *ios)
{
struct completion *waiting = ios->private;
@ -742,10 +742,10 @@ static void _done_io(struct osd_request *or, void *p)
kref_put(&ios->kref, _last_io);
}
static ssize_t _io_exec(struct objio_state *ios)
static int _io_exec(struct objio_state *ios)
{
DECLARE_COMPLETION_ONSTACK(wait);
ssize_t status = 0; /* sync status */
int ret = 0;
unsigned i;
objio_done_fn saved_done_fn = ios->done;
bool sync = ios->ol_state.sync;
@ -771,16 +771,16 @@ static ssize_t _io_exec(struct objio_state *ios)
if (sync) {
wait_for_completion(&wait);
status = saved_done_fn(ios);
ret = saved_done_fn(ios);
}
return status;
return ret;
}
/*
* read
*/
static ssize_t _read_done(struct objio_state *ios)
static int _read_done(struct objio_state *ios)
{
ssize_t status;
int ret = _io_check(ios, false);
@ -793,7 +793,7 @@ static ssize_t _read_done(struct objio_state *ios)
status = ret;
objlayout_read_done(&ios->ol_state, status, ios->ol_state.sync);
return status;
return ret;
}
static int _read_mirrors(struct objio_state *ios, unsigned cur_comp)
@ -833,7 +833,7 @@ err:
return ret;
}
static ssize_t _read_exec(struct objio_state *ios)
static int _read_exec(struct objio_state *ios)
{
unsigned i;
int ret;
@ -847,14 +847,14 @@ static ssize_t _read_exec(struct objio_state *ios)
}
ios->done = _read_done;
return _io_exec(ios); /* In sync mode exec returns the io status */
return _io_exec(ios);
err:
_io_free(ios);
return ret;
}
ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state)
int objio_read_pagelist(struct objlayout_io_state *ol_state)
{
struct objio_state *ios = container_of(ol_state, struct objio_state,
ol_state);
@ -870,7 +870,7 @@ ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state)
/*
* write
*/
static ssize_t _write_done(struct objio_state *ios)
static int _write_done(struct objio_state *ios)
{
ssize_t status;
int ret = _io_check(ios, true);
@ -887,7 +887,7 @@ static ssize_t _write_done(struct objio_state *ios)
}
objlayout_write_done(&ios->ol_state, status, ios->ol_state.sync);
return status;
return ret;
}
static int _write_mirrors(struct objio_state *ios, unsigned cur_comp)
@ -955,7 +955,7 @@ err:
return ret;
}
static ssize_t _write_exec(struct objio_state *ios)
static int _write_exec(struct objio_state *ios)
{
unsigned i;
int ret;
@ -969,14 +969,14 @@ static ssize_t _write_exec(struct objio_state *ios)
}
ios->done = _write_done;
return _io_exec(ios); /* In sync mode exec returns the io->status */
return _io_exec(ios);
err:
_io_free(ios);
return ret;
}
ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state, bool stable)
int objio_write_pagelist(struct objlayout_io_state *ol_state, bool stable)
{
struct objio_state *ios = container_of(ol_state, struct objio_state,
ol_state);

36
fs/nfs/objlayout/objlayout.c
View File

@ -315,16 +315,13 @@ objlayout_read_pagelist(struct nfs_read_data *rdata)
loff_t offset = rdata->args.offset;
size_t count = rdata->args.count;
struct objlayout_io_state *state;
ssize_t status = 0;
int err;
loff_t eof;
dprintk("%s: Begin inode %p offset %llu count %d\n",
__func__, rdata->inode, offset, (int)count);
eof = i_size_read(rdata->inode);
if (unlikely(offset + count > eof)) {
if (offset >= eof) {
status = 0;
err = 0;
rdata->res.count = 0;
rdata->res.eof = 1;
/*FIXME: do we need to call pnfs_ld_read_done() */
@ -341,14 +338,19 @@ objlayout_read_pagelist(struct nfs_read_data *rdata)
rdata->lseg, rdata,
GFP_KERNEL);
if (unlikely(!state)) {
status = -ENOMEM;
err = -ENOMEM;
goto out;
}
dprintk("%s: inode(%lx) offset 0x%llx count 0x%Zx eof=%d\n",
__func__, rdata->inode->i_ino, offset, count, rdata->res.eof);
status = objio_read_pagelist(state);
err = objio_read_pagelist(state);
out:
dprintk("%s: Return status %Zd\n", __func__, status);
rdata->pnfs_error = status;
if (unlikely(err)) {
rdata->pnfs_error = err;
dprintk("%s: Returned Error %d\n", __func__, err);
return PNFS_NOT_ATTEMPTED;
}
return PNFS_ATTEMPTED;
}
@ -406,10 +408,7 @@ objlayout_write_pagelist(struct nfs_write_data *wdata,
int how)
{
struct objlayout_io_state *state;
ssize_t status;
dprintk("%s: Begin inode %p offset %llu count %u\n",
__func__, wdata->inode, wdata->args.offset, wdata->args.count);
int err;
state = objlayout_alloc_io_state(NFS_I(wdata->inode)->layout,
wdata->args.pages,
@ -419,16 +418,19 @@ objlayout_write_pagelist(struct nfs_write_data *wdata,
wdata->lseg, wdata,
GFP_NOFS);
if (unlikely(!state)) {
status = -ENOMEM;
err = -ENOMEM;
goto out;
}
state->sync = how & FLUSH_SYNC;
status = objio_write_pagelist(state, how & FLUSH_STABLE);
err = objio_write_pagelist(state, how & FLUSH_STABLE);
out:
dprintk("%s: Return status %Zd\n", __func__, status);
wdata->pnfs_error = status;
if (unlikely(err)) {
wdata->pnfs_error = err;
dprintk("%s: Returned Error %d\n", __func__, err);
return PNFS_NOT_ATTEMPTED;
}
return PNFS_ATTEMPTED;
}

4
fs/nfs/objlayout/objlayout.h
View File

@ -115,8 +115,8 @@ extern int objio_alloc_io_state(
gfp_t gfp_flags);
extern void objio_free_io_state(struct objlayout_io_state *state);
extern ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state);
extern ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state,
extern int objio_read_pagelist(struct objlayout_io_state *ol_state);
extern int objio_write_pagelist(struct objlayout_io_state *ol_state,
bool stable);
/*