diff options
Diffstat (limited to 'fs/nfs/objlayout/objio_osd.c')
| -rw-r--r-- | fs/nfs/objlayout/objio_osd.c | 706 |
1 files changed, 706 insertions, 0 deletions
diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c new file mode 100644 index 00000000000..611320753db --- /dev/null +++ b/fs/nfs/objlayout/objio_osd.c @@ -0,0 +1,706 @@ +/* + * pNFS Objects layout implementation over open-osd initiator library + * + * Copyright (C) 2009 Panasas Inc. [year of first publication] + * All rights reserved. + * + * Benny Halevy <bhalevy@panasas.com> + * Boaz Harrosh <bharrosh@panasas.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * See the file COPYING included with this distribution for more details. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the Panasas company nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <linux/module.h> +#include <scsi/osd_ore.h> + +#include "objlayout.h" +#include "../internal.h" + +#define NFSDBG_FACILITY NFSDBG_PNFS_LD + +struct objio_dev_ent { + struct nfs4_deviceid_node id_node; + struct ore_dev od; +}; + +static void +objio_free_deviceid_node(struct nfs4_deviceid_node *d) +{ + struct objio_dev_ent *de = container_of(d, struct objio_dev_ent, id_node); + + dprintk("%s: free od=%p\n", __func__, de->od.od); + osduld_put_device(de->od.od); + kfree(de); +} + +static struct objio_dev_ent *_dev_list_find(const struct nfs_server *nfss, + const struct nfs4_deviceid *d_id) +{ + struct nfs4_deviceid_node *d; + struct objio_dev_ent *de; + + d = nfs4_find_get_deviceid(nfss->pnfs_curr_ld, nfss->nfs_client, d_id); + if (!d) + return NULL; + + de = container_of(d, struct objio_dev_ent, id_node); + return de; +} + +static struct objio_dev_ent * +_dev_list_add(const struct nfs_server *nfss, + const struct nfs4_deviceid *d_id, struct osd_dev *od, + gfp_t gfp_flags) +{ + struct nfs4_deviceid_node *d; + struct objio_dev_ent *de = kzalloc(sizeof(*de), gfp_flags); + struct objio_dev_ent *n; + + if (!de) { + dprintk("%s: -ENOMEM od=%p\n", __func__, od); + return NULL; + } + + dprintk("%s: Adding od=%p\n", __func__, od); + nfs4_init_deviceid_node(&de->id_node, + nfss->pnfs_curr_ld, + nfss->nfs_client, + d_id); + de->od.od = od; + + d = nfs4_insert_deviceid_node(&de->id_node); + n = container_of(d, struct objio_dev_ent, id_node); + if (n != de) { + dprintk("%s: Race with other n->od=%p\n", __func__, n->od.od); + objio_free_deviceid_node(&de->id_node); + de = n; + } + + return de; +} + +struct objio_segment { + struct pnfs_layout_segment lseg; + + struct ore_layout layout; + struct ore_components oc; +}; + +static inline struct objio_segment * +OBJIO_LSEG(struct pnfs_layout_segment *lseg) +{ + return container_of(lseg, struct objio_segment, lseg); +} + +struct objio_state { + /* Generic layer */ + struct objlayout_io_res oir; + + bool sync; + /*FIXME: Support for extra_bytes at ore_get_rw_state() */ + struct ore_io_state *ios; +}; + +/* Send and wait for a get_device_info of devices in the layout, + then look them up with the osd_initiator library */ +static int objio_devices_lookup(struct pnfs_layout_hdr *pnfslay, + struct objio_segment *objio_seg, unsigned c, struct nfs4_deviceid *d_id, + gfp_t gfp_flags) +{ + struct pnfs_osd_deviceaddr *deviceaddr; + struct objio_dev_ent *ode; + struct osd_dev *od; + struct osd_dev_info odi; + bool retry_flag = true; + int err; + + ode = _dev_list_find(NFS_SERVER(pnfslay->plh_inode), d_id); + if (ode) { + objio_seg->oc.ods[c] = &ode->od; /* must use container_of */ + return 0; + } + + err = objlayout_get_deviceinfo(pnfslay, d_id, &deviceaddr, gfp_flags); + if (unlikely(err)) { + dprintk("%s: objlayout_get_deviceinfo dev(%llx:%llx) =>%d\n", + __func__, _DEVID_LO(d_id), _DEVID_HI(d_id), err); + return err; + } + + odi.systemid_len = deviceaddr->oda_systemid.len; + if (odi.systemid_len > sizeof(odi.systemid)) { + dprintk("%s: odi.systemid_len > sizeof(systemid=%zd)\n", + __func__, sizeof(odi.systemid)); + err = -EINVAL; + goto out; + } else if (odi.systemid_len) + memcpy(odi.systemid, deviceaddr->oda_systemid.data, + odi.systemid_len); + odi.osdname_len = deviceaddr->oda_osdname.len; + odi.osdname = (u8 *)deviceaddr->oda_osdname.data; + + if (!odi.osdname_len && !odi.systemid_len) { + dprintk("%s: !odi.osdname_len && !odi.systemid_len\n", + __func__); + err = -ENODEV; + goto out; + } + +retry_lookup: + od = osduld_info_lookup(&odi); + if (unlikely(IS_ERR(od))) { + err = PTR_ERR(od); + dprintk("%s: osduld_info_lookup => %d\n", __func__, err); + if (err == -ENODEV && retry_flag) { + err = objlayout_autologin(deviceaddr); + if (likely(!err)) { + retry_flag = false; + goto retry_lookup; + } + } + goto out; + } + + ode = _dev_list_add(NFS_SERVER(pnfslay->plh_inode), d_id, od, + gfp_flags); + objio_seg->oc.ods[c] = &ode->od; /* must use container_of */ + dprintk("Adding new dev_id(%llx:%llx)\n", + _DEVID_LO(d_id), _DEVID_HI(d_id)); +out: + objlayout_put_deviceinfo(deviceaddr); + return err; +} + +static void copy_single_comp(struct ore_components *oc, unsigned c, + struct pnfs_osd_object_cred *src_comp) +{ + struct ore_comp *ocomp = &oc->comps[c]; + + WARN_ON(src_comp->oc_cap_key.cred_len > 0); /* libosd is NO_SEC only */ + WARN_ON(src_comp->oc_cap.cred_len > sizeof(ocomp->cred)); + + ocomp->obj.partition = src_comp->oc_object_id.oid_partition_id; + ocomp->obj.id = src_comp->oc_object_id.oid_object_id; + + memcpy(ocomp->cred, src_comp->oc_cap.cred, sizeof(ocomp->cred)); +} + +static int __alloc_objio_seg(unsigned numdevs, gfp_t gfp_flags, + struct objio_segment **pseg) +{ +/* This is the in memory structure of the objio_segment + * + * struct __alloc_objio_segment { + * struct objio_segment olseg; + * struct ore_dev *ods[numdevs]; + * struct ore_comp comps[numdevs]; + * } *aolseg; + * NOTE: The code as above compiles and runs perfectly. It is elegant, + * type safe and compact. At some Past time Linus has decided he does not + * like variable length arrays, For the sake of this principal we uglify + * the code as below. + */ + struct objio_segment *lseg; + size_t lseg_size = sizeof(*lseg) + + numdevs * sizeof(lseg->oc.ods[0]) + + numdevs * sizeof(*lseg->oc.comps); + + lseg = kzalloc(lseg_size, gfp_flags); + if (unlikely(!lseg)) { + dprintk("%s: Failed allocation numdevs=%d size=%zd\n", __func__, + numdevs, lseg_size); + return -ENOMEM; + } + + lseg->oc.numdevs = numdevs; + lseg->oc.single_comp = EC_MULTPLE_COMPS; + lseg->oc.ods = (void *)(lseg + 1); + lseg->oc.comps = (void *)(lseg->oc.ods + numdevs); + + *pseg = lseg; + return 0; +} + +int objio_alloc_lseg(struct pnfs_layout_segment **outp, + struct pnfs_layout_hdr *pnfslay, + struct pnfs_layout_range *range, + struct xdr_stream *xdr, + gfp_t gfp_flags) +{ + struct objio_segment *objio_seg; + struct pnfs_osd_xdr_decode_layout_iter iter; + struct pnfs_osd_layout layout; + struct pnfs_osd_object_cred src_comp; + unsigned cur_comp; + int err; + + err = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr); + if (unlikely(err)) + return err; + + err = __alloc_objio_seg(layout.olo_num_comps, gfp_flags, &objio_seg); + if (unlikely(err)) + return err; + + objio_seg->layout.stripe_unit = layout.olo_map.odm_stripe_unit; + objio_seg->layout.group_width = layout.olo_map.odm_group_width; + objio_seg->layout.group_depth = layout.olo_map.odm_group_depth; + objio_seg->layout.mirrors_p1 = layout.olo_map.odm_mirror_cnt + 1; + objio_seg->layout.raid_algorithm = layout.olo_map.odm_raid_algorithm; + + err = ore_verify_layout(layout.olo_map.odm_num_comps, + &objio_seg->layout); + if (unlikely(err)) + goto err; + + objio_seg->oc.first_dev = layout.olo_comps_index; + cur_comp = 0; + while (pnfs_osd_xdr_decode_layout_comp(&src_comp, &iter, xdr, &err)) { + copy_single_comp(&objio_seg->oc, cur_comp, &src_comp); + err = objio_devices_lookup(pnfslay, objio_seg, cur_comp, + &src_comp.oc_object_id.oid_device_id, + gfp_flags); + if (err) + goto err; + ++cur_comp; + } + /* pnfs_osd_xdr_decode_layout_comp returns false on error */ + if (unlikely(err)) + goto err; + + *outp = &objio_seg->lseg; + return 0; + +err: + kfree(objio_seg); + dprintk("%s: Error: return %d\n", __func__, err); + *outp = NULL; + return err; +} + +void objio_free_lseg(struct pnfs_layout_segment *lseg) +{ + int i; + struct objio_segment *objio_seg = OBJIO_LSEG(lseg); + + for (i = 0; i < objio_seg->oc.numdevs; i++) { + struct ore_dev *od = objio_seg->oc.ods[i]; + struct objio_dev_ent *ode; + + if (!od) + break; + ode = container_of(od, typeof(*ode), od); + nfs4_put_deviceid_node(&ode->id_node); + } + kfree(objio_seg); +} + +static int +objio_alloc_io_state(struct pnfs_layout_hdr *pnfs_layout_type, bool is_reading, + struct pnfs_layout_segment *lseg, struct page **pages, unsigned pgbase, + loff_t offset, size_t count, void *rpcdata, gfp_t gfp_flags, + struct objio_state **outp) +{ + struct objio_segment *objio_seg = OBJIO_LSEG(lseg); + struct ore_io_state *ios; + int ret; + struct __alloc_objio_state { + struct objio_state objios; + struct pnfs_osd_ioerr ioerrs[objio_seg->oc.numdevs]; + } *aos; + + aos = kzalloc(sizeof(*aos), gfp_flags); + if (unlikely(!aos)) + return -ENOMEM; + + objlayout_init_ioerrs(&aos->objios.oir, objio_seg->oc.numdevs, + aos->ioerrs, rpcdata, pnfs_layout_type); + + ret = ore_get_rw_state(&objio_seg->layout, &objio_seg->oc, is_reading, + offset, count, &ios); + if (unlikely(ret)) { + kfree(aos); + return ret; + } + + ios->pages = pages; + ios->pgbase = pgbase; + ios->private = aos; + BUG_ON(ios->nr_pages > (pgbase + count + PAGE_SIZE - 1) >> PAGE_SHIFT); + + aos->objios.sync = 0; + aos->objios.ios = ios; + *outp = &aos->objios; + return 0; +} + +void objio_free_result(struct objlayout_io_res *oir) +{ + struct objio_state *objios = container_of(oir, struct objio_state, oir); + + ore_put_io_state(objios->ios); + kfree(objios); +} + +static enum pnfs_osd_errno osd_pri_2_pnfs_err(enum osd_err_priority oep) +{ + switch (oep) { + case OSD_ERR_PRI_NO_ERROR: + return (enum pnfs_osd_errno)0; + + case OSD_ERR_PRI_CLEAR_PAGES: + BUG_ON(1); + return 0; + + case OSD_ERR_PRI_RESOURCE: + return PNFS_OSD_ERR_RESOURCE; + case OSD_ERR_PRI_BAD_CRED: + return PNFS_OSD_ERR_BAD_CRED; + case OSD_ERR_PRI_NO_ACCESS: + return PNFS_OSD_ERR_NO_ACCESS; + case OSD_ERR_PRI_UNREACHABLE: + return PNFS_OSD_ERR_UNREACHABLE; + case OSD_ERR_PRI_NOT_FOUND: + return PNFS_OSD_ERR_NOT_FOUND; + case OSD_ERR_PRI_NO_SPACE: + return PNFS_OSD_ERR_NO_SPACE; + default: + WARN_ON(1); + /* fallthrough */ + case OSD_ERR_PRI_EIO: + return PNFS_OSD_ERR_EIO; + } +} + +static void __on_dev_error(struct ore_io_state *ios, + struct ore_dev *od, unsigned dev_index, enum osd_err_priority oep, + u64 dev_offset, u64 dev_len) +{ + struct objio_state *objios = ios->private; + struct pnfs_osd_objid pooid; + struct objio_dev_ent *ode = container_of(od, typeof(*ode), od); + /* FIXME: what to do with more-then-one-group layouts. We need to + * translate from ore_io_state index to oc->comps index + */ + unsigned comp = dev_index; + + pooid.oid_device_id = ode->id_node.deviceid; + pooid.oid_partition_id = ios->oc->comps[comp].obj.partition; + pooid.oid_object_id = ios->oc->comps[comp].obj.id; + + objlayout_io_set_result(&objios->oir, comp, + &pooid, osd_pri_2_pnfs_err(oep), + dev_offset, dev_len, !ios->reading); +} + +/* + * read + */ +static void _read_done(struct ore_io_state *ios, void *private) +{ + struct objio_state *objios = private; + ssize_t status; + int ret = ore_check_io(ios, &__on_dev_error); + + /* FIXME: _io_free(ios) can we dealocate the libosd resources; */ + + if (likely(!ret)) + status = ios->length; + else + status = ret; + + objlayout_read_done(&objios->oir, status, objios->sync); +} + +int objio_read_pagelist(struct nfs_pgio_data *rdata) +{ + struct nfs_pgio_header *hdr = rdata->header; + struct objio_state *objios; + int ret; + + ret = objio_alloc_io_state(NFS_I(hdr->inode)->layout, true, + hdr->lseg, rdata->args.pages, rdata->args.pgbase, + rdata->args.offset, rdata->args.count, rdata, + GFP_KERNEL, &objios); + if (unlikely(ret)) + return ret; + + objios->ios->done = _read_done; + dprintk("%s: offset=0x%llx length=0x%x\n", __func__, + rdata->args.offset, rdata->args.count); + ret = ore_read(objios->ios); + if (unlikely(ret)) + objio_free_result(&objios->oir); + return ret; +} + +/* + * write + */ +static void _write_done(struct ore_io_state *ios, void *private) +{ + struct objio_state *objios = private; + ssize_t status; + int ret = ore_check_io(ios, &__on_dev_error); + + /* FIXME: _io_free(ios) can we dealocate the libosd resources; */ + + if (likely(!ret)) { + /* FIXME: should be based on the OSD's persistence model + * See OSD2r05 Section 4.13 Data persistence model */ + objios->oir.committed = NFS_FILE_SYNC; + status = ios->length; + } else { + status = ret; + } + + objlayout_write_done(&objios->oir, status, objios->sync); +} + +static struct page *__r4w_get_page(void *priv, u64 offset, bool *uptodate) +{ + struct objio_state *objios = priv; + struct nfs_pgio_data *wdata = objios->oir.rpcdata; + struct address_space *mapping = wdata->header->inode->i_mapping; + pgoff_t index = offset / PAGE_SIZE; + struct page *page; + loff_t i_size = i_size_read(wdata->header->inode); + + if (offset >= i_size) { + *uptodate = true; + dprintk("%s: g_zero_page index=0x%lx\n", __func__, index); + return ZERO_PAGE(0); + } + + page = find_get_page(mapping, index); + if (!page) { + page = find_or_create_page(mapping, index, GFP_NOFS); + if (unlikely(!page)) { + dprintk("%s: grab_cache_page Failed index=0x%lx\n", + __func__, index); + return NULL; + } + unlock_page(page); + } + if (PageDirty(page) || PageWriteback(page)) + *uptodate = true; + else + *uptodate = PageUptodate(page); + dprintk("%s: index=0x%lx uptodate=%d\n", __func__, index, *uptodate); + return page; +} + +static void __r4w_put_page(void *priv, struct page *page) +{ + dprintk("%s: index=0x%lx\n", __func__, + (page == ZERO_PAGE(0)) ? -1UL : page->index); + if (ZERO_PAGE(0) != page) + page_cache_release(page); + return; +} + +static const struct _ore_r4w_op _r4w_op = { + .get_page = &__r4w_get_page, + .put_page = &__r4w_put_page, +}; + +int objio_write_pagelist(struct nfs_pgio_data *wdata, int how) +{ + struct nfs_pgio_header *hdr = wdata->header; + struct objio_state *objios; + int ret; + + ret = objio_alloc_io_state(NFS_I(hdr->inode)->layout, false, + hdr->lseg, wdata->args.pages, wdata->args.pgbase, + wdata->args.offset, wdata->args.count, wdata, GFP_NOFS, + &objios); + if (unlikely(ret)) + return ret; + + objios->sync = 0 != (how & FLUSH_SYNC); + objios->ios->r4w = &_r4w_op; + + if (!objios->sync) + objios->ios->done = _write_done; + + dprintk("%s: offset=0x%llx length=0x%x\n", __func__, + wdata->args.offset, wdata->args.count); + ret = ore_write(objios->ios); + if (unlikely(ret)) { + objio_free_result(&objios->oir); + return ret; + } + + if (objios->sync) + _write_done(objios->ios, objios); + + return 0; +} + +/* + * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number + * of bytes (maximum @req->wb_bytes) that can be coalesced. + */ +static size_t objio_pg_test(struct nfs_pageio_descriptor *pgio, + struct nfs_page *prev, struct nfs_page *req) +{ + unsigned int size; + + size = pnfs_generic_pg_test(pgio, prev, req); + + if (!size || pgio->pg_count + req->wb_bytes > + (unsigned long)pgio->pg_layout_private) + return 0; + + return min(size, req->wb_bytes); +} + +static void objio_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) +{ + pnfs_generic_pg_init_read(pgio, req); + if (unlikely(pgio->pg_lseg == NULL)) + return; /* Not pNFS */ + + pgio->pg_layout_private = (void *) + OBJIO_LSEG(pgio->pg_lseg)->layout.max_io_length; +} + +static bool aligned_on_raid_stripe(u64 offset, struct ore_layout *layout, + unsigned long *stripe_end) +{ + u32 stripe_off; + unsigned stripe_size; + + if (layout->raid_algorithm == PNFS_OSD_RAID_0) + return true; + + stripe_size = layout->stripe_unit * + (layout->group_width - layout->parity); + + div_u64_rem(offset, stripe_size, &stripe_off); + if (!stripe_off) + return true; + + *stripe_end = stripe_size - stripe_off; + return false; +} + +static void objio_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) +{ + unsigned long stripe_end = 0; + u64 wb_size; + + if (pgio->pg_dreq == NULL) + wb_size = i_size_read(pgio->pg_inode) - req_offset(req); + else + wb_size = nfs_dreq_bytes_left(pgio->pg_dreq); + + pnfs_generic_pg_init_write(pgio, req, wb_size); + if (unlikely(pgio->pg_lseg == NULL)) + return; /* Not pNFS */ + + if (req->wb_offset || + !aligned_on_raid_stripe(req->wb_index * PAGE_SIZE, + &OBJIO_LSEG(pgio->pg_lseg)->layout, + &stripe_end)) { + pgio->pg_layout_private = (void *)stripe_end; + } else { + pgio->pg_layout_private = (void *) + OBJIO_LSEG(pgio->pg_lseg)->layout.max_io_length; + } +} + +static const struct nfs_pageio_ops objio_pg_read_ops = { + .pg_init = objio_init_read, + .pg_test = objio_pg_test, + .pg_doio = pnfs_generic_pg_readpages, +}; + +static const struct nfs_pageio_ops objio_pg_write_ops = { + .pg_init = objio_init_write, + .pg_test = objio_pg_test, + .pg_doio = pnfs_generic_pg_writepages, +}; + +static struct pnfs_layoutdriver_type objlayout_type = { + .id = LAYOUT_OSD2_OBJECTS, + .name = "LAYOUT_OSD2_OBJECTS", + .flags = PNFS_LAYOUTRET_ON_SETATTR | + PNFS_LAYOUTRET_ON_ERROR, + + .owner = THIS_MODULE, + .alloc_layout_hdr = objlayout_alloc_layout_hdr, + .free_layout_hdr = objlayout_free_layout_hdr, + + .alloc_lseg = objlayout_alloc_lseg, + .free_lseg = objlayout_free_lseg, + + .read_pagelist = objlayout_read_pagelist, + .write_pagelist = objlayout_write_pagelist, + .pg_read_ops = &objio_pg_read_ops, + .pg_write_ops = &objio_pg_write_ops, + + .free_deviceid_node = objio_free_deviceid_node, + + .encode_layoutcommit = objlayout_encode_layoutcommit, + .encode_layoutreturn = objlayout_encode_layoutreturn, +}; + +MODULE_DESCRIPTION("pNFS Layout Driver for OSD2 objects"); +MODULE_AUTHOR("Benny Halevy <bhalevy@panasas.com>"); +MODULE_LICENSE("GPL"); + +static int __init +objlayout_init(void) +{ + int ret = pnfs_register_layoutdriver(&objlayout_type); + + if (ret) + printk(KERN_INFO + "NFS: %s: Registering OSD pNFS Layout Driver failed: error=%d\n", + __func__, ret); + else + printk(KERN_INFO "NFS: %s: Registered OSD pNFS Layout Driver\n", + __func__); + return ret; +} + +static void __exit +objlayout_exit(void) +{ + pnfs_unregister_layoutdriver(&objlayout_type); + printk(KERN_INFO "NFS: %s: Unregistered OSD pNFS Layout Driver\n", + __func__); +} + +MODULE_ALIAS("nfs-layouttype4-2"); + +module_init(objlayout_init); +module_exit(objlayout_exit); |