| /* |
| * linux/fs/nfs/callback_proc.c |
| * |
| * Copyright (C) 2004 Trond Myklebust |
| * |
| * NFSv4 callback procedures |
| */ |
| #include <linux/nfs4.h> |
| #include <linux/nfs_fs.h> |
| #include <linux/slab.h> |
| #include <linux/rcupdate.h> |
| #include "nfs4_fs.h" |
| #include "callback.h" |
| #include "delegation.h" |
| #include "internal.h" |
| #include "pnfs.h" |
| #include "nfs4session.h" |
| #include "nfs4trace.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_CALLBACK |
| |
| __be32 nfs4_callback_getattr(struct cb_getattrargs *args, |
| struct cb_getattrres *res, |
| struct cb_process_state *cps) |
| { |
| struct nfs_delegation *delegation; |
| struct nfs_inode *nfsi; |
| struct inode *inode; |
| |
| res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION); |
| if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ |
| goto out; |
| |
| res->bitmap[0] = res->bitmap[1] = 0; |
| res->status = htonl(NFS4ERR_BADHANDLE); |
| |
| dprintk_rcu("NFS: GETATTR callback request from %s\n", |
| rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); |
| |
| inode = nfs_delegation_find_inode(cps->clp, &args->fh); |
| if (inode == NULL) { |
| trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL, |
| -ntohl(res->status)); |
| goto out; |
| } |
| nfsi = NFS_I(inode); |
| rcu_read_lock(); |
| delegation = rcu_dereference(nfsi->delegation); |
| if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0) |
| goto out_iput; |
| res->size = i_size_read(inode); |
| res->change_attr = delegation->change_attr; |
| if (nfsi->nrequests != 0) |
| res->change_attr++; |
| res->ctime = inode->i_ctime; |
| res->mtime = inode->i_mtime; |
| res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) & |
| args->bitmap[0]; |
| res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) & |
| args->bitmap[1]; |
| res->status = 0; |
| out_iput: |
| rcu_read_unlock(); |
| trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status)); |
| iput(inode); |
| out: |
| dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); |
| return res->status; |
| } |
| |
| __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy, |
| struct cb_process_state *cps) |
| { |
| struct inode *inode; |
| __be32 res; |
| |
| res = htonl(NFS4ERR_OP_NOT_IN_SESSION); |
| if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ |
| goto out; |
| |
| dprintk_rcu("NFS: RECALL callback request from %s\n", |
| rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); |
| |
| res = htonl(NFS4ERR_BADHANDLE); |
| inode = nfs_delegation_find_inode(cps->clp, &args->fh); |
| if (inode == NULL) |
| goto out; |
| /* Set up a helper thread to actually return the delegation */ |
| switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { |
| case 0: |
| res = 0; |
| break; |
| case -ENOENT: |
| res = htonl(NFS4ERR_BAD_STATEID); |
| break; |
| default: |
| res = htonl(NFS4ERR_RESOURCE); |
| } |
| trace_nfs4_recall_delegation(inode, -ntohl(res)); |
| iput(inode); |
| out: |
| dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); |
| return res; |
| } |
| |
| #if defined(CONFIG_NFS_V4_1) |
| |
| /* |
| * Lookup a layout by filehandle. |
| * |
| * Note: gets a refcount on the layout hdr and on its respective inode. |
| * Caller must put the layout hdr and the inode. |
| * |
| * TODO: keep track of all layouts (and delegations) in a hash table |
| * hashed by filehandle. |
| */ |
| static struct pnfs_layout_hdr * get_layout_by_fh_locked(struct nfs_client *clp, |
| struct nfs_fh *fh, nfs4_stateid *stateid) |
| { |
| struct nfs_server *server; |
| struct inode *ino; |
| struct pnfs_layout_hdr *lo; |
| |
| list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| list_for_each_entry(lo, &server->layouts, plh_layouts) { |
| if (!nfs4_stateid_match_other(&lo->plh_stateid, stateid)) |
| continue; |
| if (nfs_compare_fh(fh, &NFS_I(lo->plh_inode)->fh)) |
| continue; |
| ino = igrab(lo->plh_inode); |
| if (!ino) |
| break; |
| spin_lock(&ino->i_lock); |
| /* Is this layout in the process of being freed? */ |
| if (NFS_I(ino)->layout != lo) { |
| spin_unlock(&ino->i_lock); |
| iput(ino); |
| break; |
| } |
| pnfs_get_layout_hdr(lo); |
| spin_unlock(&ino->i_lock); |
| return lo; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static struct pnfs_layout_hdr * get_layout_by_fh(struct nfs_client *clp, |
| struct nfs_fh *fh, nfs4_stateid *stateid) |
| { |
| struct pnfs_layout_hdr *lo; |
| |
| spin_lock(&clp->cl_lock); |
| rcu_read_lock(); |
| lo = get_layout_by_fh_locked(clp, fh, stateid); |
| rcu_read_unlock(); |
| spin_unlock(&clp->cl_lock); |
| |
| return lo; |
| } |
| |
| static u32 initiate_file_draining(struct nfs_client *clp, |
| struct cb_layoutrecallargs *args) |
| { |
| struct inode *ino; |
| struct pnfs_layout_hdr *lo; |
| u32 rv = NFS4ERR_NOMATCHING_LAYOUT; |
| LIST_HEAD(free_me_list); |
| |
| lo = get_layout_by_fh(clp, &args->cbl_fh, &args->cbl_stateid); |
| if (!lo) |
| goto out; |
| |
| ino = lo->plh_inode; |
| |
| spin_lock(&ino->i_lock); |
| pnfs_set_layout_stateid(lo, &args->cbl_stateid, true); |
| spin_unlock(&ino->i_lock); |
| |
| pnfs_layoutcommit_inode(ino, false); |
| |
| spin_lock(&ino->i_lock); |
| if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) || |
| pnfs_mark_matching_lsegs_invalid(lo, &free_me_list, |
| &args->cbl_range)) { |
| rv = NFS4ERR_DELAY; |
| goto unlock; |
| } |
| |
| if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { |
| NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, |
| &args->cbl_range); |
| } |
| unlock: |
| spin_unlock(&ino->i_lock); |
| pnfs_free_lseg_list(&free_me_list); |
| pnfs_put_layout_hdr(lo); |
| trace_nfs4_cb_layoutrecall_inode(clp, &args->cbl_fh, ino, -rv); |
| iput(ino); |
| out: |
| return rv; |
| } |
| |
| static u32 initiate_bulk_draining(struct nfs_client *clp, |
| struct cb_layoutrecallargs *args) |
| { |
| int stat; |
| |
| if (args->cbl_recall_type == RETURN_FSID) |
| stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true); |
| else |
| stat = pnfs_destroy_layouts_byclid(clp, true); |
| if (stat != 0) |
| return NFS4ERR_DELAY; |
| return NFS4ERR_NOMATCHING_LAYOUT; |
| } |
| |
| static u32 do_callback_layoutrecall(struct nfs_client *clp, |
| struct cb_layoutrecallargs *args) |
| { |
| u32 res; |
| |
| dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type); |
| if (args->cbl_recall_type == RETURN_FILE) |
| res = initiate_file_draining(clp, args); |
| else |
| res = initiate_bulk_draining(clp, args); |
| dprintk("%s returning %i\n", __func__, res); |
| return res; |
| |
| } |
| |
| __be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args, |
| void *dummy, struct cb_process_state *cps) |
| { |
| u32 res; |
| |
| dprintk("%s: -->\n", __func__); |
| |
| if (cps->clp) |
| res = do_callback_layoutrecall(cps->clp, args); |
| else |
| res = NFS4ERR_OP_NOT_IN_SESSION; |
| |
| dprintk("%s: exit with status = %d\n", __func__, res); |
| return cpu_to_be32(res); |
| } |
| |
| static void pnfs_recall_all_layouts(struct nfs_client *clp) |
| { |
| struct cb_layoutrecallargs args; |
| |
| /* Pretend we got a CB_LAYOUTRECALL(ALL) */ |
| memset(&args, 0, sizeof(args)); |
| args.cbl_recall_type = RETURN_ALL; |
| /* FIXME we ignore errors, what should we do? */ |
| do_callback_layoutrecall(clp, &args); |
| } |
| |
| __be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args, |
| void *dummy, struct cb_process_state *cps) |
| { |
| int i; |
| __be32 res = 0; |
| struct nfs_client *clp = cps->clp; |
| struct nfs_server *server = NULL; |
| |
| dprintk("%s: -->\n", __func__); |
| |
| if (!clp) { |
| res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); |
| goto out; |
| } |
| |
| for (i = 0; i < args->ndevs; i++) { |
| struct cb_devicenotifyitem *dev = &args->devs[i]; |
| |
| if (!server || |
| server->pnfs_curr_ld->id != dev->cbd_layout_type) { |
| rcu_read_lock(); |
| list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
| if (server->pnfs_curr_ld && |
| server->pnfs_curr_ld->id == dev->cbd_layout_type) { |
| rcu_read_unlock(); |
| goto found; |
| } |
| rcu_read_unlock(); |
| dprintk("%s: layout type %u not found\n", |
| __func__, dev->cbd_layout_type); |
| continue; |
| } |
| |
| found: |
| nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id); |
| } |
| |
| out: |
| kfree(args->devs); |
| dprintk("%s: exit with status = %u\n", |
| __func__, be32_to_cpu(res)); |
| return res; |
| } |
| |
| /* |
| * Validate the sequenceID sent by the server. |
| * Return success if the sequenceID is one more than what we last saw on |
| * this slot, accounting for wraparound. Increments the slot's sequence. |
| * |
| * We don't yet implement a duplicate request cache, instead we set the |
| * back channel ca_maxresponsesize_cached to zero. This is OK for now |
| * since we only currently implement idempotent callbacks anyway. |
| * |
| * We have a single slot backchannel at this time, so we don't bother |
| * checking the used_slots bit array on the table. The lower layer guarantees |
| * a single outstanding callback request at a time. |
| */ |
| static __be32 |
| validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args) |
| { |
| struct nfs4_slot *slot; |
| |
| dprintk("%s enter. slotid %u seqid %u\n", |
| __func__, args->csa_slotid, args->csa_sequenceid); |
| |
| if (args->csa_slotid >= NFS41_BC_MAX_CALLBACKS) |
| return htonl(NFS4ERR_BADSLOT); |
| |
| slot = tbl->slots + args->csa_slotid; |
| dprintk("%s slot table seqid: %u\n", __func__, slot->seq_nr); |
| |
| /* Normal */ |
| if (likely(args->csa_sequenceid == slot->seq_nr + 1)) |
| goto out_ok; |
| |
| /* Replay */ |
| if (args->csa_sequenceid == slot->seq_nr) { |
| dprintk("%s seqid %u is a replay\n", |
| __func__, args->csa_sequenceid); |
| /* Signal process_op to set this error on next op */ |
| if (args->csa_cachethis == 0) |
| return htonl(NFS4ERR_RETRY_UNCACHED_REP); |
| |
| /* The ca_maxresponsesize_cached is 0 with no DRC */ |
| else if (args->csa_cachethis == 1) |
| return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); |
| } |
| |
| /* Wraparound */ |
| if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) { |
| slot->seq_nr = 1; |
| goto out_ok; |
| } |
| |
| /* Misordered request */ |
| return htonl(NFS4ERR_SEQ_MISORDERED); |
| out_ok: |
| tbl->highest_used_slotid = args->csa_slotid; |
| return htonl(NFS4_OK); |
| } |
| |
| /* |
| * For each referring call triple, check the session's slot table for |
| * a match. If the slot is in use and the sequence numbers match, the |
| * client is still waiting for a response to the original request. |
| */ |
| static bool referring_call_exists(struct nfs_client *clp, |
| uint32_t nrclists, |
| struct referring_call_list *rclists) |
| { |
| bool status = 0; |
| int i, j; |
| struct nfs4_session *session; |
| struct nfs4_slot_table *tbl; |
| struct referring_call_list *rclist; |
| struct referring_call *ref; |
| |
| /* |
| * XXX When client trunking is implemented, this becomes |
| * a session lookup from within the loop |
| */ |
| session = clp->cl_session; |
| tbl = &session->fc_slot_table; |
| |
| for (i = 0; i < nrclists; i++) { |
| rclist = &rclists[i]; |
| if (memcmp(session->sess_id.data, |
| rclist->rcl_sessionid.data, |
| NFS4_MAX_SESSIONID_LEN) != 0) |
| continue; |
| |
| for (j = 0; j < rclist->rcl_nrefcalls; j++) { |
| ref = &rclist->rcl_refcalls[j]; |
| |
| dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u " |
| "slotid %u\n", __func__, |
| ((u32 *)&rclist->rcl_sessionid.data)[0], |
| ((u32 *)&rclist->rcl_sessionid.data)[1], |
| ((u32 *)&rclist->rcl_sessionid.data)[2], |
| ((u32 *)&rclist->rcl_sessionid.data)[3], |
| ref->rc_sequenceid, ref->rc_slotid); |
| |
| spin_lock(&tbl->slot_tbl_lock); |
| status = (test_bit(ref->rc_slotid, tbl->used_slots) && |
| tbl->slots[ref->rc_slotid].seq_nr == |
| ref->rc_sequenceid); |
| spin_unlock(&tbl->slot_tbl_lock); |
| if (status) |
| goto out; |
| } |
| } |
| |
| out: |
| return status; |
| } |
| |
| __be32 nfs4_callback_sequence(struct cb_sequenceargs *args, |
| struct cb_sequenceres *res, |
| struct cb_process_state *cps) |
| { |
| struct nfs4_slot_table *tbl; |
| struct nfs4_slot *slot; |
| struct nfs_client *clp; |
| int i; |
| __be32 status = htonl(NFS4ERR_BADSESSION); |
| |
| clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, |
| &args->csa_sessionid, cps->minorversion); |
| if (clp == NULL) |
| goto out; |
| |
| if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) |
| goto out; |
| |
| tbl = &clp->cl_session->bc_slot_table; |
| slot = tbl->slots + args->csa_slotid; |
| |
| spin_lock(&tbl->slot_tbl_lock); |
| /* state manager is resetting the session */ |
| if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { |
| status = htonl(NFS4ERR_DELAY); |
| /* Return NFS4ERR_BADSESSION if we're draining the session |
| * in order to reset it. |
| */ |
| if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
| status = htonl(NFS4ERR_BADSESSION); |
| goto out_unlock; |
| } |
| |
| memcpy(&res->csr_sessionid, &args->csa_sessionid, |
| sizeof(res->csr_sessionid)); |
| res->csr_sequenceid = args->csa_sequenceid; |
| res->csr_slotid = args->csa_slotid; |
| res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; |
| res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1; |
| |
| status = validate_seqid(tbl, args); |
| if (status) |
| goto out_unlock; |
| |
| cps->slotid = args->csa_slotid; |
| |
| /* |
| * Check for pending referring calls. If a match is found, a |
| * related callback was received before the response to the original |
| * call. |
| */ |
| if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) { |
| status = htonl(NFS4ERR_DELAY); |
| goto out_unlock; |
| } |
| |
| /* |
| * RFC5661 20.9.3 |
| * If CB_SEQUENCE returns an error, then the state of the slot |
| * (sequence ID, cached reply) MUST NOT change. |
| */ |
| slot->seq_nr++; |
| out_unlock: |
| spin_unlock(&tbl->slot_tbl_lock); |
| |
| out: |
| cps->clp = clp; /* put in nfs4_callback_compound */ |
| for (i = 0; i < args->csa_nrclists; i++) |
| kfree(args->csa_rclists[i].rcl_refcalls); |
| kfree(args->csa_rclists); |
| |
| if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { |
| cps->drc_status = status; |
| status = 0; |
| } else |
| res->csr_status = status; |
| |
| trace_nfs4_cb_sequence(args, res, status); |
| dprintk("%s: exit with status = %d res->csr_status %d\n", __func__, |
| ntohl(status), ntohl(res->csr_status)); |
| return status; |
| } |
| |
| static bool |
| validate_bitmap_values(unsigned long mask) |
| { |
| return (mask & ~RCA4_TYPE_MASK_ALL) == 0; |
| } |
| |
| __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy, |
| struct cb_process_state *cps) |
| { |
| __be32 status; |
| fmode_t flags = 0; |
| |
| status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); |
| if (!cps->clp) /* set in cb_sequence */ |
| goto out; |
| |
| dprintk_rcu("NFS: RECALL_ANY callback request from %s\n", |
| rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); |
| |
| status = cpu_to_be32(NFS4ERR_INVAL); |
| if (!validate_bitmap_values(args->craa_type_mask)) |
| goto out; |
| |
| status = cpu_to_be32(NFS4_OK); |
| if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *) |
| &args->craa_type_mask)) |
| flags = FMODE_READ; |
| if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *) |
| &args->craa_type_mask)) |
| flags |= FMODE_WRITE; |
| if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *) |
| &args->craa_type_mask)) |
| pnfs_recall_all_layouts(cps->clp); |
| if (flags) |
| nfs_expire_unused_delegation_types(cps->clp, flags); |
| out: |
| dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
| return status; |
| } |
| |
| /* Reduce the fore channel's max_slots to the target value */ |
| __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy, |
| struct cb_process_state *cps) |
| { |
| struct nfs4_slot_table *fc_tbl; |
| __be32 status; |
| |
| status = htonl(NFS4ERR_OP_NOT_IN_SESSION); |
| if (!cps->clp) /* set in cb_sequence */ |
| goto out; |
| |
| dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n", |
| rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), |
| args->crsa_target_highest_slotid); |
| |
| fc_tbl = &cps->clp->cl_session->fc_slot_table; |
| |
| status = htonl(NFS4_OK); |
| |
| nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid); |
| nfs41_notify_server(cps->clp); |
| out: |
| dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); |
| return status; |
| } |
| #endif /* CONFIG_NFS_V4_1 */ |