pnfs-obj: osd raid engine read/write implementation
With the use of the in-kernel osd library. Implement read/write
of data from/to osd-objects according to information specified
in the objects-layout.
Support for stripping over mirrors with a received stripe_unit.
There are however a few constrains which are not supported:
1. Stripe Unit must be a multiple of PAGE_SIZE
2. stripe length (stripe_unit * number_of_stripes) can not be
bigger then 32bit.
Also support raid-groups and partial-layout. Partial-layout is
when not all the groups are received on the line, addressing
only a partial range of the file.
TODO:
Only raid0! raid 4/5/6 support will come at later stage
A none supported layout will send IO through the MDS
[Important fallout from the last rebase]
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
[gfp_flags]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Boaz Harrosh
parent
d20581aa4b
commit
04f8345038
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@ -46,6 +46,10 @@
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#define _LLU(x) ((unsigned long long)x)
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enum { BIO_MAX_PAGES_KMALLOC =
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(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
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};
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struct objio_dev_ent {
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struct nfs4_deviceid_node id_node;
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struct osd_dev *od;
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@ -136,6 +140,31 @@ OBJIO_LSEG(struct pnfs_layout_segment *lseg)
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return container_of(lseg, struct objio_segment, lseg);
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}
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struct objio_state;
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typedef ssize_t (*objio_done_fn)(struct objio_state *ios);
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struct objio_state {
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/* Generic layer */
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struct objlayout_io_state ol_state;
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struct objio_segment *layout;
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struct kref kref;
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objio_done_fn done;
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void *private;
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unsigned long length;
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unsigned numdevs; /* Actually used devs in this IO */
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/* A per-device variable array of size numdevs */
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struct _objio_per_comp {
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struct bio *bio;
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struct osd_request *or;
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unsigned long length;
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u64 offset;
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unsigned dev;
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} per_dev[];
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};
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/* Send and wait for a get_device_info of devices in the layout,
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then look them up with the osd_initiator library */
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static struct objio_dev_ent *_device_lookup(struct pnfs_layout_hdr *pnfslay,
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@ -359,6 +388,578 @@ void objio_free_lseg(struct pnfs_layout_segment *lseg)
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kfree(objio_seg);
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}
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int objio_alloc_io_state(struct pnfs_layout_segment *lseg,
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struct objlayout_io_state **outp,
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gfp_t gfp_flags)
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{
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struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
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struct objio_state *ios;
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const unsigned first_size = sizeof(*ios) +
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objio_seg->num_comps * sizeof(ios->per_dev[0]);
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ios = kzalloc(first_size, gfp_flags);
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if (unlikely(!ios))
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return -ENOMEM;
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ios->layout = objio_seg;
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*outp = &ios->ol_state;
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return 0;
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}
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void objio_free_io_state(struct objlayout_io_state *ol_state)
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{
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struct objio_state *ios = container_of(ol_state, struct objio_state,
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ol_state);
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kfree(ios);
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}
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static void _clear_bio(struct bio *bio)
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{
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struct bio_vec *bv;
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unsigned i;
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__bio_for_each_segment(bv, bio, i, 0) {
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unsigned this_count = bv->bv_len;
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if (likely(PAGE_SIZE == this_count))
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clear_highpage(bv->bv_page);
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else
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zero_user(bv->bv_page, bv->bv_offset, this_count);
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}
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}
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static int _io_check(struct objio_state *ios, bool is_write)
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{
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enum osd_err_priority oep = OSD_ERR_PRI_NO_ERROR;
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int lin_ret = 0;
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int i;
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for (i = 0; i < ios->numdevs; i++) {
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struct osd_sense_info osi;
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struct osd_request *or = ios->per_dev[i].or;
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unsigned dev;
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int ret;
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if (!or)
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continue;
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ret = osd_req_decode_sense(or, &osi);
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if (likely(!ret))
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continue;
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if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
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/* start read offset passed endof file */
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BUG_ON(is_write);
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_clear_bio(ios->per_dev[i].bio);
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dprintk("%s: start read offset passed end of file "
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"offset=0x%llx, length=0x%lx\n", __func__,
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_LLU(ios->per_dev[i].offset),
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ios->per_dev[i].length);
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continue; /* we recovered */
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}
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dev = ios->per_dev[i].dev;
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if (osi.osd_err_pri >= oep) {
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oep = osi.osd_err_pri;
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lin_ret = ret;
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}
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}
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return lin_ret;
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}
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/*
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* Common IO state helpers.
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*/
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static void _io_free(struct objio_state *ios)
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{
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unsigned i;
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for (i = 0; i < ios->numdevs; i++) {
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struct _objio_per_comp *per_dev = &ios->per_dev[i];
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if (per_dev->or) {
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osd_end_request(per_dev->or);
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per_dev->or = NULL;
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}
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if (per_dev->bio) {
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bio_put(per_dev->bio);
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per_dev->bio = NULL;
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}
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}
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}
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struct osd_dev *_io_od(struct objio_state *ios, unsigned dev)
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{
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unsigned min_dev = ios->layout->comps_index;
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unsigned max_dev = min_dev + ios->layout->num_comps;
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BUG_ON(dev < min_dev || max_dev <= dev);
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return ios->layout->ods[dev - min_dev]->od;
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}
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struct _striping_info {
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u64 obj_offset;
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u64 group_length;
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unsigned dev;
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unsigned unit_off;
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};
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static void _calc_stripe_info(struct objio_state *ios, u64 file_offset,
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struct _striping_info *si)
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{
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u32 stripe_unit = ios->layout->stripe_unit;
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u32 group_width = ios->layout->group_width;
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u64 group_depth = ios->layout->group_depth;
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u32 U = stripe_unit * group_width;
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u64 T = U * group_depth;
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u64 S = T * ios->layout->group_count;
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u64 M = div64_u64(file_offset, S);
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/*
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G = (L - (M * S)) / T
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H = (L - (M * S)) % T
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*/
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u64 LmodU = file_offset - M * S;
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u32 G = div64_u64(LmodU, T);
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u64 H = LmodU - G * T;
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u32 N = div_u64(H, U);
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div_u64_rem(file_offset, stripe_unit, &si->unit_off);
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si->obj_offset = si->unit_off + (N * stripe_unit) +
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(M * group_depth * stripe_unit);
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/* "H - (N * U)" is just "H % U" so it's bound to u32 */
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si->dev = (u32)(H - (N * U)) / stripe_unit + G * group_width;
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si->dev *= ios->layout->mirrors_p1;
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si->group_length = T - H;
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}
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static int _add_stripe_unit(struct objio_state *ios, unsigned *cur_pg,
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unsigned pgbase, struct _objio_per_comp *per_dev, int cur_len,
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gfp_t gfp_flags)
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{
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unsigned pg = *cur_pg;
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struct request_queue *q =
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osd_request_queue(_io_od(ios, per_dev->dev));
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per_dev->length += cur_len;
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if (per_dev->bio == NULL) {
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unsigned stripes = ios->layout->num_comps /
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ios->layout->mirrors_p1;
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unsigned pages_in_stripe = stripes *
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(ios->layout->stripe_unit / PAGE_SIZE);
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unsigned bio_size = (ios->ol_state.nr_pages + pages_in_stripe) /
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stripes;
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if (BIO_MAX_PAGES_KMALLOC < bio_size)
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bio_size = BIO_MAX_PAGES_KMALLOC;
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per_dev->bio = bio_kmalloc(gfp_flags, bio_size);
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if (unlikely(!per_dev->bio)) {
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dprintk("Faild to allocate BIO size=%u\n", bio_size);
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return -ENOMEM;
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}
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}
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while (cur_len > 0) {
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unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len);
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unsigned added_len;
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BUG_ON(ios->ol_state.nr_pages <= pg);
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cur_len -= pglen;
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added_len = bio_add_pc_page(q, per_dev->bio,
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ios->ol_state.pages[pg], pglen, pgbase);
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if (unlikely(pglen != added_len))
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return -ENOMEM;
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pgbase = 0;
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++pg;
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}
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BUG_ON(cur_len);
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*cur_pg = pg;
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return 0;
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}
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static int _prepare_one_group(struct objio_state *ios, u64 length,
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struct _striping_info *si, unsigned *last_pg,
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gfp_t gfp_flags)
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{
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unsigned stripe_unit = ios->layout->stripe_unit;
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unsigned mirrors_p1 = ios->layout->mirrors_p1;
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unsigned devs_in_group = ios->layout->group_width * mirrors_p1;
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unsigned dev = si->dev;
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unsigned first_dev = dev - (dev % devs_in_group);
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unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0;
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unsigned cur_pg = *last_pg;
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int ret = 0;
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while (length) {
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struct _objio_per_comp *per_dev = &ios->per_dev[dev];
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unsigned cur_len, page_off = 0;
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if (!per_dev->length) {
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per_dev->dev = dev;
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if (dev < si->dev) {
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per_dev->offset = si->obj_offset + stripe_unit -
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si->unit_off;
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cur_len = stripe_unit;
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} else if (dev == si->dev) {
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per_dev->offset = si->obj_offset;
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cur_len = stripe_unit - si->unit_off;
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page_off = si->unit_off & ~PAGE_MASK;
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BUG_ON(page_off &&
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(page_off != ios->ol_state.pgbase));
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} else { /* dev > si->dev */
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per_dev->offset = si->obj_offset - si->unit_off;
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cur_len = stripe_unit;
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}
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if (max_comp < dev)
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max_comp = dev;
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} else {
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cur_len = stripe_unit;
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}
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if (cur_len >= length)
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cur_len = length;
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ret = _add_stripe_unit(ios, &cur_pg, page_off , per_dev,
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cur_len, gfp_flags);
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if (unlikely(ret))
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goto out;
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dev += mirrors_p1;
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dev = (dev % devs_in_group) + first_dev;
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length -= cur_len;
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ios->length += cur_len;
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}
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out:
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ios->numdevs = max_comp + mirrors_p1;
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*last_pg = cur_pg;
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return ret;
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}
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static int _io_rw_pagelist(struct objio_state *ios, gfp_t gfp_flags)
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{
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u64 length = ios->ol_state.count;
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u64 offset = ios->ol_state.offset;
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struct _striping_info si;
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unsigned last_pg = 0;
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int ret = 0;
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while (length) {
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_calc_stripe_info(ios, offset, &si);
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if (length < si.group_length)
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si.group_length = length;
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ret = _prepare_one_group(ios, si.group_length, &si, &last_pg, gfp_flags);
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if (unlikely(ret))
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goto out;
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offset += si.group_length;
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length -= si.group_length;
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}
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out:
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if (!ios->length)
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return ret;
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return 0;
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}
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static ssize_t _sync_done(struct objio_state *ios)
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{
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struct completion *waiting = ios->private;
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complete(waiting);
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return 0;
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}
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static void _last_io(struct kref *kref)
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{
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struct objio_state *ios = container_of(kref, struct objio_state, kref);
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ios->done(ios);
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}
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static void _done_io(struct osd_request *or, void *p)
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{
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struct objio_state *ios = p;
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kref_put(&ios->kref, _last_io);
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}
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static ssize_t _io_exec(struct objio_state *ios)
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{
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DECLARE_COMPLETION_ONSTACK(wait);
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ssize_t status = 0; /* sync status */
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unsigned i;
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objio_done_fn saved_done_fn = ios->done;
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bool sync = ios->ol_state.sync;
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if (sync) {
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ios->done = _sync_done;
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ios->private = &wait;
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}
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kref_init(&ios->kref);
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for (i = 0; i < ios->numdevs; i++) {
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struct osd_request *or = ios->per_dev[i].or;
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if (!or)
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continue;
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kref_get(&ios->kref);
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osd_execute_request_async(or, _done_io, ios);
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}
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kref_put(&ios->kref, _last_io);
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if (sync) {
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wait_for_completion(&wait);
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status = saved_done_fn(ios);
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}
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return status;
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}
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/*
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* read
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*/
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static ssize_t _read_done(struct objio_state *ios)
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{
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ssize_t status;
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int ret = _io_check(ios, false);
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_io_free(ios);
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if (likely(!ret))
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status = ios->length;
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else
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status = ret;
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objlayout_read_done(&ios->ol_state, status, ios->ol_state.sync);
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return status;
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}
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static int _read_mirrors(struct objio_state *ios, unsigned cur_comp)
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{
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struct osd_request *or = NULL;
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struct _objio_per_comp *per_dev = &ios->per_dev[cur_comp];
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unsigned dev = per_dev->dev;
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struct pnfs_osd_object_cred *cred =
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&ios->layout->comps[dev];
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struct osd_obj_id obj = {
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.partition = cred->oc_object_id.oid_partition_id,
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.id = cred->oc_object_id.oid_object_id,
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};
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int ret;
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or = osd_start_request(_io_od(ios, dev), GFP_KERNEL);
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if (unlikely(!or)) {
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ret = -ENOMEM;
|
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goto err;
|
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}
|
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per_dev->or = or;
|
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osd_req_read(or, &obj, per_dev->offset, per_dev->bio, per_dev->length);
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ret = osd_finalize_request(or, 0, cred->oc_cap.cred, NULL);
|
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if (ret) {
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dprintk("%s: Faild to osd_finalize_request() => %d\n",
|
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__func__, ret);
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goto err;
|
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}
|
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|
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dprintk("%s:[%d] dev=%d obj=0x%llx start=0x%llx length=0x%lx\n",
|
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__func__, cur_comp, dev, obj.id, _LLU(per_dev->offset),
|
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per_dev->length);
|
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|
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err:
|
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return ret;
|
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}
|
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|
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static ssize_t _read_exec(struct objio_state *ios)
|
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{
|
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unsigned i;
|
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int ret;
|
||||
|
||||
for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
|
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if (!ios->per_dev[i].length)
|
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continue;
|
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ret = _read_mirrors(ios, i);
|
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if (unlikely(ret))
|
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goto err;
|
||||
}
|
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|
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ios->done = _read_done;
|
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return _io_exec(ios); /* In sync mode exec returns the io status */
|
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|
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err:
|
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_io_free(ios);
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return ret;
|
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}
|
||||
|
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ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state)
|
||||
{
|
||||
struct objio_state *ios = container_of(ol_state, struct objio_state,
|
||||
ol_state);
|
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int ret;
|
||||
|
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ret = _io_rw_pagelist(ios, GFP_KERNEL);
|
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if (unlikely(ret))
|
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return ret;
|
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|
||||
return _read_exec(ios);
|
||||
}
|
||||
|
||||
/*
|
||||
* write
|
||||
*/
|
||||
static ssize_t _write_done(struct objio_state *ios)
|
||||
{
|
||||
ssize_t status;
|
||||
int ret = _io_check(ios, true);
|
||||
|
||||
_io_free(ios);
|
||||
|
||||
if (likely(!ret)) {
|
||||
/* FIXME: should be based on the OSD's persistence model
|
||||
* See OSD2r05 Section 4.13 Data persistence model */
|
||||
ios->ol_state.committed = NFS_FILE_SYNC;
|
||||
status = ios->length;
|
||||
} else {
|
||||
status = ret;
|
||||
}
|
||||
|
||||
objlayout_write_done(&ios->ol_state, status, ios->ol_state.sync);
|
||||
return status;
|
||||
}
|
||||
|
||||
static int _write_mirrors(struct objio_state *ios, unsigned cur_comp)
|
||||
{
|
||||
struct _objio_per_comp *master_dev = &ios->per_dev[cur_comp];
|
||||
unsigned dev = ios->per_dev[cur_comp].dev;
|
||||
unsigned last_comp = cur_comp + ios->layout->mirrors_p1;
|
||||
int ret;
|
||||
|
||||
for (; cur_comp < last_comp; ++cur_comp, ++dev) {
|
||||
struct osd_request *or = NULL;
|
||||
struct pnfs_osd_object_cred *cred =
|
||||
&ios->layout->comps[dev];
|
||||
struct osd_obj_id obj = {
|
||||
.partition = cred->oc_object_id.oid_partition_id,
|
||||
.id = cred->oc_object_id.oid_object_id,
|
||||
};
|
||||
struct _objio_per_comp *per_dev = &ios->per_dev[cur_comp];
|
||||
struct bio *bio;
|
||||
|
||||
or = osd_start_request(_io_od(ios, dev), GFP_NOFS);
|
||||
if (unlikely(!or)) {
|
||||
ret = -ENOMEM;
|
||||
goto err;
|
||||
}
|
||||
per_dev->or = or;
|
||||
|
||||
if (per_dev != master_dev) {
|
||||
bio = bio_kmalloc(GFP_NOFS,
|
||||
master_dev->bio->bi_max_vecs);
|
||||
if (unlikely(!bio)) {
|
||||
dprintk("Faild to allocate BIO size=%u\n",
|
||||
master_dev->bio->bi_max_vecs);
|
||||
ret = -ENOMEM;
|
||||
goto err;
|
||||
}
|
||||
|
||||
__bio_clone(bio, master_dev->bio);
|
||||
bio->bi_bdev = NULL;
|
||||
bio->bi_next = NULL;
|
||||
per_dev->bio = bio;
|
||||
per_dev->dev = dev;
|
||||
per_dev->length = master_dev->length;
|
||||
per_dev->offset = master_dev->offset;
|
||||
} else {
|
||||
bio = master_dev->bio;
|
||||
bio->bi_rw |= REQ_WRITE;
|
||||
}
|
||||
|
||||
osd_req_write(or, &obj, per_dev->offset, bio, per_dev->length);
|
||||
|
||||
ret = osd_finalize_request(or, 0, cred->oc_cap.cred, NULL);
|
||||
if (ret) {
|
||||
dprintk("%s: Faild to osd_finalize_request() => %d\n",
|
||||
__func__, ret);
|
||||
goto err;
|
||||
}
|
||||
|
||||
dprintk("%s:[%d] dev=%d obj=0x%llx start=0x%llx length=0x%lx\n",
|
||||
__func__, cur_comp, dev, obj.id, _LLU(per_dev->offset),
|
||||
per_dev->length);
|
||||
}
|
||||
|
||||
err:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t _write_exec(struct objio_state *ios)
|
||||
{
|
||||
unsigned i;
|
||||
int ret;
|
||||
|
||||
for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
|
||||
if (!ios->per_dev[i].length)
|
||||
continue;
|
||||
ret = _write_mirrors(ios, i);
|
||||
if (unlikely(ret))
|
||||
goto err;
|
||||
}
|
||||
|
||||
ios->done = _write_done;
|
||||
return _io_exec(ios); /* In sync mode exec returns the io->status */
|
||||
|
||||
err:
|
||||
_io_free(ios);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state, bool stable)
|
||||
{
|
||||
struct objio_state *ios = container_of(ol_state, struct objio_state,
|
||||
ol_state);
|
||||
int ret;
|
||||
|
||||
/* TODO: ios->stable = stable; */
|
||||
ret = _io_rw_pagelist(ios, GFP_NOFS);
|
||||
if (unlikely(ret))
|
||||
return ret;
|
||||
|
||||
return _write_exec(ios);
|
||||
}
|
||||
|
||||
/*
|
||||
* objlayout_pg_test(). Called by nfs_can_coalesce_requests()
|
||||
*
|
||||
* return 1 : coalesce page
|
||||
* return 0 : don't coalesce page
|
||||
*/
|
||||
int
|
||||
objlayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
|
||||
struct nfs_page *req)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
static struct pnfs_layoutdriver_type objlayout_type = {
|
||||
.id = LAYOUT_OSD2_OBJECTS,
|
||||
|
|
@ -370,6 +971,10 @@ static struct pnfs_layoutdriver_type objlayout_type = {
|
|||
.alloc_lseg = objlayout_alloc_lseg,
|
||||
.free_lseg = objlayout_free_lseg,
|
||||
|
||||
.read_pagelist = objlayout_read_pagelist,
|
||||
.write_pagelist = objlayout_write_pagelist,
|
||||
.pg_test = objlayout_pg_test,
|
||||
|
||||
.free_deviceid_node = objio_free_deviceid_node,
|
||||
};
|
||||
|
||||
|
|
|
|||
|
|
@ -128,6 +128,260 @@ objlayout_free_lseg(struct pnfs_layout_segment *lseg)
|
|||
objio_free_lseg(lseg);
|
||||
}
|
||||
|
||||
/*
|
||||
* I/O Operations
|
||||
*/
|
||||
static inline u64
|
||||
end_offset(u64 start, u64 len)
|
||||
{
|
||||
u64 end;
|
||||
|
||||
end = start + len;
|
||||
return end >= start ? end : NFS4_MAX_UINT64;
|
||||
}
|
||||
|
||||
/* last octet in a range */
|
||||
static inline u64
|
||||
last_byte_offset(u64 start, u64 len)
|
||||
{
|
||||
u64 end;
|
||||
|
||||
BUG_ON(!len);
|
||||
end = start + len;
|
||||
return end > start ? end - 1 : NFS4_MAX_UINT64;
|
||||
}
|
||||
|
||||
static struct objlayout_io_state *
|
||||
objlayout_alloc_io_state(struct pnfs_layout_hdr *pnfs_layout_type,
|
||||
struct page **pages,
|
||||
unsigned pgbase,
|
||||
loff_t offset,
|
||||
size_t count,
|
||||
struct pnfs_layout_segment *lseg,
|
||||
void *rpcdata,
|
||||
gfp_t gfp_flags)
|
||||
{
|
||||
struct objlayout_io_state *state;
|
||||
u64 lseg_end_offset;
|
||||
|
||||
dprintk("%s: allocating io_state\n", __func__);
|
||||
if (objio_alloc_io_state(lseg, &state, gfp_flags))
|
||||
return NULL;
|
||||
|
||||
BUG_ON(offset < lseg->pls_range.offset);
|
||||
lseg_end_offset = end_offset(lseg->pls_range.offset,
|
||||
lseg->pls_range.length);
|
||||
BUG_ON(offset >= lseg_end_offset);
|
||||
if (offset + count > lseg_end_offset) {
|
||||
count = lseg->pls_range.length -
|
||||
(offset - lseg->pls_range.offset);
|
||||
dprintk("%s: truncated count %Zd\n", __func__, count);
|
||||
}
|
||||
|
||||
if (pgbase > PAGE_SIZE) {
|
||||
pages += pgbase >> PAGE_SHIFT;
|
||||
pgbase &= ~PAGE_MASK;
|
||||
}
|
||||
|
||||
state->lseg = lseg;
|
||||
state->rpcdata = rpcdata;
|
||||
state->pages = pages;
|
||||
state->pgbase = pgbase;
|
||||
state->nr_pages = (pgbase + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
||||
state->offset = offset;
|
||||
state->count = count;
|
||||
state->sync = 0;
|
||||
|
||||
return state;
|
||||
}
|
||||
|
||||
static void
|
||||
objlayout_free_io_state(struct objlayout_io_state *state)
|
||||
{
|
||||
dprintk("%s: freeing io_state\n", __func__);
|
||||
if (unlikely(!state))
|
||||
return;
|
||||
|
||||
objio_free_io_state(state);
|
||||
}
|
||||
|
||||
/*
|
||||
* I/O done common code
|
||||
*/
|
||||
static void
|
||||
objlayout_iodone(struct objlayout_io_state *state)
|
||||
{
|
||||
dprintk("%s: state %p status\n", __func__, state);
|
||||
|
||||
objlayout_free_io_state(state);
|
||||
}
|
||||
|
||||
/* Function scheduled on rpc workqueue to call ->nfs_readlist_complete().
|
||||
* This is because the osd completion is called with ints-off from
|
||||
* the block layer
|
||||
*/
|
||||
static void _rpc_read_complete(struct work_struct *work)
|
||||
{
|
||||
struct rpc_task *task;
|
||||
struct nfs_read_data *rdata;
|
||||
|
||||
dprintk("%s enter\n", __func__);
|
||||
task = container_of(work, struct rpc_task, u.tk_work);
|
||||
rdata = container_of(task, struct nfs_read_data, task);
|
||||
|
||||
pnfs_ld_read_done(rdata);
|
||||
}
|
||||
|
||||
void
|
||||
objlayout_read_done(struct objlayout_io_state *state, ssize_t status, bool sync)
|
||||
{
|
||||
int eof = state->eof;
|
||||
struct nfs_read_data *rdata;
|
||||
|
||||
state->status = status;
|
||||
dprintk("%s: Begin status=%ld eof=%d\n", __func__, status, eof);
|
||||
rdata = state->rpcdata;
|
||||
rdata->task.tk_status = status;
|
||||
if (status >= 0) {
|
||||
rdata->res.count = status;
|
||||
rdata->res.eof = eof;
|
||||
}
|
||||
objlayout_iodone(state);
|
||||
/* must not use state after this point */
|
||||
|
||||
if (sync)
|
||||
pnfs_ld_read_done(rdata);
|
||||
else {
|
||||
INIT_WORK(&rdata->task.u.tk_work, _rpc_read_complete);
|
||||
schedule_work(&rdata->task.u.tk_work);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Perform sync or async reads.
|
||||
*/
|
||||
enum pnfs_try_status
|
||||
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;
|
||||
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;
|
||||
rdata->res.count = 0;
|
||||
rdata->res.eof = 1;
|
||||
goto out;
|
||||
}
|
||||
count = eof - offset;
|
||||
}
|
||||
|
||||
state = objlayout_alloc_io_state(NFS_I(rdata->inode)->layout,
|
||||
rdata->args.pages, rdata->args.pgbase,
|
||||
offset, count,
|
||||
rdata->lseg, rdata,
|
||||
GFP_KERNEL);
|
||||
if (unlikely(!state)) {
|
||||
status = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
state->eof = state->offset + state->count >= eof;
|
||||
|
||||
status = objio_read_pagelist(state);
|
||||
out:
|
||||
dprintk("%s: Return status %Zd\n", __func__, status);
|
||||
rdata->pnfs_error = status;
|
||||
return PNFS_ATTEMPTED;
|
||||
}
|
||||
|
||||
/* Function scheduled on rpc workqueue to call ->nfs_writelist_complete().
|
||||
* This is because the osd completion is called with ints-off from
|
||||
* the block layer
|
||||
*/
|
||||
static void _rpc_write_complete(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);
|
||||
}
|
||||
|
||||
void
|
||||
objlayout_write_done(struct objlayout_io_state *state, ssize_t status,
|
||||
bool sync)
|
||||
{
|
||||
struct nfs_write_data *wdata;
|
||||
|
||||
dprintk("%s: Begin\n", __func__);
|
||||
wdata = state->rpcdata;
|
||||
state->status = status;
|
||||
wdata->task.tk_status = status;
|
||||
if (status >= 0) {
|
||||
wdata->res.count = status;
|
||||
wdata->verf.committed = state->committed;
|
||||
dprintk("%s: Return status %d committed %d\n",
|
||||
__func__, wdata->task.tk_status,
|
||||
wdata->verf.committed);
|
||||
} else
|
||||
dprintk("%s: Return status %d\n",
|
||||
__func__, wdata->task.tk_status);
|
||||
objlayout_iodone(state);
|
||||
/* must not use state after this point */
|
||||
|
||||
if (sync)
|
||||
pnfs_ld_write_done(wdata);
|
||||
else {
|
||||
INIT_WORK(&wdata->task.u.tk_work, _rpc_write_complete);
|
||||
schedule_work(&wdata->task.u.tk_work);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Perform sync or async writes.
|
||||
*/
|
||||
enum pnfs_try_status
|
||||
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);
|
||||
|
||||
state = objlayout_alloc_io_state(NFS_I(wdata->inode)->layout,
|
||||
wdata->args.pages,
|
||||
wdata->args.pgbase,
|
||||
wdata->args.offset,
|
||||
wdata->args.count,
|
||||
wdata->lseg, wdata,
|
||||
GFP_NOFS);
|
||||
if (unlikely(!state)) {
|
||||
status = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
state->sync = how & FLUSH_SYNC;
|
||||
|
||||
status = objio_write_pagelist(state, how & FLUSH_STABLE);
|
||||
out:
|
||||
dprintk("%s: Return status %Zd\n", __func__, status);
|
||||
wdata->pnfs_error = status;
|
||||
return PNFS_ATTEMPTED;
|
||||
}
|
||||
|
||||
/*
|
||||
* Get Device Info API for io engines
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -58,6 +58,26 @@ OBJLAYOUT(struct pnfs_layout_hdr *lo)
|
|||
return container_of(lo, struct objlayout, pnfs_layout);
|
||||
}
|
||||
|
||||
/*
|
||||
* per-I/O operation state
|
||||
* embedded in objects provider io_state data structure
|
||||
*/
|
||||
struct objlayout_io_state {
|
||||
struct pnfs_layout_segment *lseg;
|
||||
|
||||
struct page **pages;
|
||||
unsigned pgbase;
|
||||
unsigned nr_pages;
|
||||
unsigned long count;
|
||||
loff_t offset;
|
||||
bool sync;
|
||||
|
||||
void *rpcdata;
|
||||
int status; /* res */
|
||||
int eof; /* res */
|
||||
int committed; /* res */
|
||||
};
|
||||
|
||||
/*
|
||||
* Raid engine I/O API
|
||||
*/
|
||||
|
|
@ -68,9 +88,24 @@ extern int objio_alloc_lseg(struct pnfs_layout_segment **outp,
|
|||
gfp_t gfp_flags);
|
||||
extern void objio_free_lseg(struct pnfs_layout_segment *lseg);
|
||||
|
||||
extern int objio_alloc_io_state(
|
||||
struct pnfs_layout_segment *lseg,
|
||||
struct objlayout_io_state **outp,
|
||||
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,
|
||||
bool stable);
|
||||
|
||||
/*
|
||||
* callback API
|
||||
*/
|
||||
extern void objlayout_read_done(struct objlayout_io_state *state,
|
||||
ssize_t status, bool sync);
|
||||
extern void objlayout_write_done(struct objlayout_io_state *state,
|
||||
ssize_t status, bool sync);
|
||||
|
||||
extern int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay,
|
||||
struct nfs4_deviceid *d_id, struct pnfs_osd_deviceaddr **deviceaddr,
|
||||
gfp_t gfp_flags);
|
||||
|
|
@ -89,4 +124,11 @@ extern struct pnfs_layout_segment *objlayout_alloc_lseg(
|
|||
gfp_t gfp_flags);
|
||||
extern void objlayout_free_lseg(struct pnfs_layout_segment *);
|
||||
|
||||
extern enum pnfs_try_status objlayout_read_pagelist(
|
||||
struct nfs_read_data *);
|
||||
|
||||
extern enum pnfs_try_status objlayout_write_pagelist(
|
||||
struct nfs_write_data *,
|
||||
int how);
|
||||
|
||||
#endif /* _OBJLAYOUT_H */
|
||||
|
|
|
|||
Loading…
Reference in New Issue