Commit 650e2d39 authored by Fred Isaman's avatar Fred Isaman Committed by Trond Myklebust

pnfsblock: bl_write_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: bl_write_pagelist support functions]
[pnfsblock: bl_write_pagelist adjust for missing PG_USE_PNFS]
Signed-off-by: default avatarFred Isaman <iisaman@citi.umich.edu>
[pnfsblock: handle errors when read or write pagelist.]
Signed-off-by: default avatarZhang Jingwang <yyalone@gmail.com>
[pnfs-block: use new write_pagelist api]
Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
Signed-off-by: default avatarBenny Halevy <bhalevy@tonian.com>
Signed-off-by: default avatarJim Rees <rees@umich.edu>

[SQUASHME: pnfsblock: mds_offset is set in the generic layer]
Signed-off-by: default avatarBoaz Harrosh <bharrosh@panasas.com>
Signed-off-by: default avatarBenny Halevy <bhalevy@tonian.com>

[pnfsblock: mark IO error with NFS_LAYOUT_{RW|RO}_FAILED]
Signed-off-by: default avatarPeng Tao <peng_tao@emc.com>
[pnfsblock: SQUASHME: adjust to API change]
Signed-off-by: default avatarFred Isaman <iisaman@citi.umich.edu>
[pnfsblock: fixup blksize alignment in bl_setup_layoutcommit]
Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
Signed-off-by: default avatarBenny Halevy <bhalevy@tonian.com>
[pnfsblock: bl_write_pagelist adjust for missing PG_USE_PNFS]
Signed-off-by: default avatarFred Isaman <iisaman@citi.umich.edu>
[pnfsblock: handle errors when read or write pagelist.]
Signed-off-by: default avatarZhang Jingwang <yyalone@gmail.com>
[pnfs-block: use new write_pagelist api]
Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
Signed-off-by: default avatarBenny Halevy <bhalevy@tonian.com>
Signed-off-by: default avatarJim Rees <rees@umich.edu>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 9549ec01
......@@ -74,6 +74,19 @@ static int is_hole(struct pnfs_block_extent *be, sector_t isect)
return !bl_is_sector_init(be->be_inval, isect);
}
/* Given the be associated with isect, determine if page data can be
* written to disk.
*/
static int is_writable(struct pnfs_block_extent *be, sector_t isect)
{
if (be->be_state == PNFS_BLOCK_READWRITE_DATA)
return 1;
else if (be->be_state != PNFS_BLOCK_INVALID_DATA)
return 0;
else
return bl_is_sector_init(be->be_inval, isect);
}
/* The data we are handed might be spread across several bios. We need
* to track when the last one is finished.
*/
......@@ -316,11 +329,121 @@ bl_read_pagelist(struct nfs_read_data *rdata)
return PNFS_NOT_ATTEMPTED;
}
/* This is basically copied from mpage_end_io_read */
static void bl_end_io_write(struct bio *bio, int err)
{
struct parallel_io *par = bio->bi_private;
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct nfs_write_data *wdata = (struct nfs_write_data *)par->data;
if (!uptodate) {
if (!wdata->pnfs_error)
wdata->pnfs_error = -EIO;
bl_set_lo_fail(wdata->lseg);
}
bio_put(bio);
put_parallel(par);
}
/* Function scheduled for call during bl_end_par_io_write,
* it marks sectors as written and extends the commitlist.
*/
static void bl_write_cleanup(struct work_struct *work)
{
struct rpc_task *task;
struct nfs_write_data *wdata;
dprintk("%s enter\n", __func__);
task = container_of(work, struct rpc_task, u.tk_work);
wdata = container_of(task, struct nfs_write_data, task);
pnfs_ld_write_done(wdata);
}
/* Called when last of bios associated with a bl_write_pagelist call finishes */
static void
bl_end_par_io_write(void *data)
{
struct nfs_write_data *wdata = data;
/* STUB - ignoring error handling */
wdata->task.tk_status = 0;
wdata->verf.committed = NFS_FILE_SYNC;
INIT_WORK(&wdata->task.u.tk_work, bl_write_cleanup);
schedule_work(&wdata->task.u.tk_work);
}
static enum pnfs_try_status
bl_write_pagelist(struct nfs_write_data *wdata,
int sync)
bl_write_pagelist(struct nfs_write_data *wdata, int sync)
{
int i;
struct bio *bio = NULL;
struct pnfs_block_extent *be = NULL;
sector_t isect, extent_length = 0;
struct parallel_io *par;
loff_t offset = wdata->args.offset;
size_t count = wdata->args.count;
struct page **pages = wdata->args.pages;
int pg_index = wdata->args.pgbase >> PAGE_CACHE_SHIFT;
dprintk("%s enter, %Zu@%lld\n", __func__, count, offset);
/* At this point, wdata->pages is a (sequential) list of nfs_pages.
* We want to write each, and if there is an error remove it from
* list and call
* nfs_retry_request(req) to have it redone using nfs.
* QUEST? Do as block or per req? Think have to do per block
* as part of end_bio
*/
par = alloc_parallel(wdata);
if (!par)
return PNFS_NOT_ATTEMPTED;
par->call_ops = *wdata->mds_ops;
par->call_ops.rpc_call_done = bl_rpc_do_nothing;
par->pnfs_callback = bl_end_par_io_write;
/* At this point, have to be more careful with error handling */
isect = (sector_t) ((offset & (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT);
for (i = pg_index; i < wdata->npages ; i++) {
if (!extent_length) {
/* We've used up the previous extent */
bl_put_extent(be);
bio = bl_submit_bio(WRITE, bio);
/* Get the next one */
be = bl_find_get_extent(BLK_LSEG2EXT(wdata->lseg),
isect, NULL);
if (!be || !is_writable(be, isect)) {
wdata->pnfs_error = -ENOMEM;
goto out;
}
extent_length = be->be_length -
(isect - be->be_f_offset);
}
for (;;) {
if (!bio) {
bio = bio_alloc(GFP_NOIO, wdata->npages - i);
if (!bio) {
wdata->pnfs_error = -ENOMEM;
goto out;
}
bio->bi_sector = isect - be->be_f_offset +
be->be_v_offset;
bio->bi_bdev = be->be_mdev;
bio->bi_end_io = bl_end_io_write;
bio->bi_private = par;
}
if (bio_add_page(bio, pages[i], PAGE_SIZE, 0))
break;
bio = bl_submit_bio(WRITE, bio);
}
isect += PAGE_CACHE_SECTORS;
extent_length -= PAGE_CACHE_SECTORS;
}
wdata->res.count = (isect << SECTOR_SHIFT) - (offset);
if (count < wdata->res.count)
wdata->res.count = count;
out:
bl_put_extent(be);
bl_submit_bio(WRITE, bio);
put_parallel(par);
return PNFS_ATTEMPTED;
}
/* FIXME - range ignored */
......
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