| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * linux/fs/nfs/callback_proc.c |
| * |
| * Copyright (C) 2004 Trond Myklebust |
| * |
| * NFSv4 callback procedures |
| */ |
| |
| #include <linux/errno.h> |
| #include <linux/math.h> |
| #include <linux/nfs4.h> |
| #include <linux/nfs_fs.h> |
| #include <linux/slab.h> |
| #include <linux/rcupdate.h> |
| #include <linux/types.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(void *argp, void *resp, |
| struct cb_process_state *cps) |
| { |
| struct cb_getattrargs *args = argp; |
| struct cb_getattrres *res = resp; |
| struct nfs_delegation *delegation; |
| 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 (IS_ERR(inode)) { |
| if (inode == ERR_PTR(-EAGAIN)) |
| res->status = htonl(NFS4ERR_DELAY); |
| trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL, |
| -ntohl(res->status)); |
| goto out; |
| } |
| rcu_read_lock(); |
| delegation = nfs4_get_valid_delegation(inode); |
| if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0) |
| goto out_iput; |
| res->size = i_size_read(inode); |
| res->change_attr = delegation->change_attr; |
| if (nfs_have_writebacks(inode)) |
| 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)); |
| nfs_iput_and_deactive(inode); |
| out: |
| dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); |
| return res->status; |
| } |
| |
| __be32 nfs4_callback_recall(void *argp, void *resp, |
| struct cb_process_state *cps) |
| { |
| struct cb_recallargs *args = argp; |
| 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 (IS_ERR(inode)) { |
| if (inode == ERR_PTR(-EAGAIN)) |
| res = htonl(NFS4ERR_DELAY); |
| trace_nfs4_cb_recall(cps->clp, &args->fh, NULL, |
| &args->stateid, -ntohl(res)); |
| 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_cb_recall(cps->clp, &args->fh, inode, |
| &args->stateid, -ntohl(res)); |
| nfs_iput_and_deactive(inode); |
| out: |
| dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); |
| return res; |
| } |
| |
| #if defined(CONFIG_NFS_V4_1) |
| |
| /* |
| * Lookup a layout inode by stateid |
| * |
| * Note: returns a refcount on the inode and superblock |
| */ |
| static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp, |
| const nfs4_stateid *stateid) |
| __must_hold(RCU) |
| { |
| struct nfs_server *server; |
| struct inode *inode; |
| struct pnfs_layout_hdr *lo; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { |
| if (!pnfs_layout_is_valid(lo)) |
| continue; |
| if (!nfs4_stateid_match_other(stateid, &lo->plh_stateid)) |
| continue; |
| if (nfs_sb_active(server->super)) |
| inode = igrab(lo->plh_inode); |
| else |
| inode = ERR_PTR(-EAGAIN); |
| rcu_read_unlock(); |
| if (inode) |
| return inode; |
| nfs_sb_deactive(server->super); |
| return ERR_PTR(-EAGAIN); |
| } |
| } |
| rcu_read_unlock(); |
| return ERR_PTR(-ENOENT); |
| } |
| |
| /* |
| * Lookup a layout inode by filehandle. |
| * |
| * Note: returns a refcount on the inode and superblock |
| * |
| */ |
| static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp, |
| const struct nfs_fh *fh) |
| { |
| struct nfs_server *server; |
| struct nfs_inode *nfsi; |
| struct inode *inode; |
| struct pnfs_layout_hdr *lo; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { |
| nfsi = NFS_I(lo->plh_inode); |
| if (nfs_compare_fh(fh, &nfsi->fh)) |
| continue; |
| if (nfsi->layout != lo) |
| continue; |
| if (nfs_sb_active(server->super)) |
| inode = igrab(lo->plh_inode); |
| else |
| inode = ERR_PTR(-EAGAIN); |
| rcu_read_unlock(); |
| if (inode) |
| return inode; |
| nfs_sb_deactive(server->super); |
| return ERR_PTR(-EAGAIN); |
| } |
| } |
| rcu_read_unlock(); |
| return ERR_PTR(-ENOENT); |
| } |
| |
| static struct inode *nfs_layout_find_inode(struct nfs_client *clp, |
| const struct nfs_fh *fh, |
| const nfs4_stateid *stateid) |
| { |
| struct inode *inode; |
| |
| inode = nfs_layout_find_inode_by_stateid(clp, stateid); |
| if (inode == ERR_PTR(-ENOENT)) |
| inode = nfs_layout_find_inode_by_fh(clp, fh); |
| return inode; |
| } |
| |
| /* |
| * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing) |
| */ |
| static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo, |
| const nfs4_stateid *new) |
| { |
| u32 oldseq, newseq; |
| |
| /* Is the stateid not initialised? */ |
| if (!pnfs_layout_is_valid(lo)) |
| return NFS4ERR_NOMATCHING_LAYOUT; |
| |
| /* Mismatched stateid? */ |
| if (!nfs4_stateid_match_other(&lo->plh_stateid, new)) |
| return NFS4ERR_BAD_STATEID; |
| |
| newseq = be32_to_cpu(new->seqid); |
| /* Are we already in a layout recall situation? */ |
| if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && |
| lo->plh_return_seq != 0) { |
| if (newseq < lo->plh_return_seq) |
| return NFS4ERR_OLD_STATEID; |
| if (newseq > lo->plh_return_seq) |
| return NFS4ERR_DELAY; |
| goto out; |
| } |
| |
| /* Check that the stateid matches what we think it should be. */ |
| oldseq = be32_to_cpu(lo->plh_stateid.seqid); |
| if (newseq > oldseq + 1) |
| return NFS4ERR_DELAY; |
| /* Crazy server! */ |
| if (newseq <= oldseq) |
| return NFS4ERR_OLD_STATEID; |
| out: |
| return NFS_OK; |
| } |
| |
| 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); |
| |
| ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid); |
| if (IS_ERR(ino)) { |
| if (ino == ERR_PTR(-EAGAIN)) |
| rv = NFS4ERR_DELAY; |
| goto out_noput; |
| } |
| |
| pnfs_layoutcommit_inode(ino, false); |
| |
| |
| spin_lock(&ino->i_lock); |
| lo = NFS_I(ino)->layout; |
| if (!lo) { |
| spin_unlock(&ino->i_lock); |
| goto out; |
| } |
| pnfs_get_layout_hdr(lo); |
| rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid); |
| if (rv != NFS_OK) |
| goto unlock; |
| |
| /* |
| * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return) |
| */ |
| if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { |
| rv = NFS4ERR_DELAY; |
| goto unlock; |
| } |
| |
| pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true); |
| switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list, |
| &args->cbl_range, |
| be32_to_cpu(args->cbl_stateid.seqid))) { |
| case 0: |
| case -EBUSY: |
| /* There are layout segments that need to be returned */ |
| rv = NFS4_OK; |
| break; |
| case -ENOENT: |
| /* Embrace your forgetfulness! */ |
| rv = NFS4ERR_NOMATCHING_LAYOUT; |
| |
| 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); |
| /* Free all lsegs that are attached to commit buckets */ |
| nfs_commit_inode(ino, 0); |
| pnfs_put_layout_hdr(lo); |
| out: |
| nfs_iput_and_deactive(ino); |
| out_noput: |
| trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino, |
| &args->cbl_stateid, -rv); |
| 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) |
| { |
| if (args->cbl_recall_type == RETURN_FILE) |
| return initiate_file_draining(clp, args); |
| return initiate_bulk_draining(clp, args); |
| } |
| |
| __be32 nfs4_callback_layoutrecall(void *argp, void *resp, |
| struct cb_process_state *cps) |
| { |
| struct cb_layoutrecallargs *args = argp; |
| u32 res = NFS4ERR_OP_NOT_IN_SESSION; |
| |
| if (cps->clp) |
| res = do_callback_layoutrecall(cps->clp, args); |
| 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(void *argp, void *resp, |
| struct cb_process_state *cps) |
| { |
| struct cb_devicenotifyargs *args = argp; |
| int i; |
| __be32 res = 0; |
| struct nfs_client *clp = cps->clp; |
| struct nfs_server *server = NULL; |
| |
| 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(); |
| continue; |
| } |
| |
| found: |
| nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id); |
| } |
| |
| out: |
| kfree(args->devs); |
| 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(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot, |
| const struct cb_sequenceargs * args) |
| { |
| __be32 ret; |
| |
| ret = cpu_to_be32(NFS4ERR_BADSLOT); |
| if (args->csa_slotid > tbl->server_highest_slotid) |
| goto out_err; |
| |
| /* Replay */ |
| if (args->csa_sequenceid == slot->seq_nr) { |
| ret = cpu_to_be32(NFS4ERR_DELAY); |
| if (nfs4_test_locked_slot(tbl, slot->slot_nr)) |
| goto out_err; |
| |
| /* Signal process_op to set this error on next op */ |
| ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP); |
| if (args->csa_cachethis == 0) |
| goto out_err; |
| |
| /* Liar! We never allowed you to set csa_cachethis != 0 */ |
| ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY); |
| goto out_err; |
| } |
| |
| /* Note: wraparound relies on seq_nr being of type u32 */ |
| /* Misordered request */ |
| ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED); |
| if (args->csa_sequenceid != slot->seq_nr + 1) |
| goto out_err; |
| |
| return cpu_to_be32(NFS4_OK); |
| |
| out_err: |
| trace_nfs4_cb_seqid_err(args, ret); |
| return ret; |
| } |
| |
| /* |
| * 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 int referring_call_exists(struct nfs_client *clp, |
| uint32_t nrclists, |
| struct referring_call_list *rclists, |
| spinlock_t *lock) |
| __releases(lock) |
| __acquires(lock) |
| { |
| int 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]; |
| spin_unlock(lock); |
| status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid, |
| ref->rc_sequenceid, HZ >> 1) < 0; |
| spin_lock(lock); |
| if (status) |
| goto out; |
| } |
| } |
| |
| out: |
| return status; |
| } |
| |
| __be32 nfs4_callback_sequence(void *argp, void *resp, |
| struct cb_process_state *cps) |
| { |
| struct cb_sequenceargs *args = argp; |
| struct cb_sequenceres *res = resp; |
| 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; |
| |
| /* Set up res before grabbing the spinlock */ |
| memcpy(&res->csr_sessionid, &args->csa_sessionid, |
| sizeof(res->csr_sessionid)); |
| res->csr_sequenceid = args->csa_sequenceid; |
| res->csr_slotid = 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; |
| } |
| |
| status = htonl(NFS4ERR_BADSLOT); |
| slot = nfs4_lookup_slot(tbl, args->csa_slotid); |
| if (IS_ERR(slot)) |
| goto out_unlock; |
| |
| res->csr_highestslotid = tbl->server_highest_slotid; |
| res->csr_target_highestslotid = tbl->target_highest_slotid; |
| |
| status = validate_seqid(tbl, slot, args); |
| if (status) |
| goto out_unlock; |
| if (!nfs4_try_to_lock_slot(tbl, slot)) { |
| status = htonl(NFS4ERR_DELAY); |
| goto out_unlock; |
| } |
| cps->slot = slot; |
| |
| /* The ca_maxresponsesize_cached is 0 with no DRC */ |
| if (args->csa_cachethis != 0) { |
| status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); |
| goto out_unlock; |
| } |
| |
| /* |
| * 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, |
| &tbl->slot_tbl_lock) < 0) { |
| 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 = args->csa_sequenceid; |
| 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); |
| return status; |
| } |
| |
| static bool |
| validate_bitmap_values(unsigned int mask) |
| { |
| return (mask & ~RCA4_TYPE_MASK_ALL) == 0; |
| } |
| |
| __be32 nfs4_callback_recallany(void *argp, void *resp, |
| struct cb_process_state *cps) |
| { |
| struct cb_recallanyargs *args = argp; |
| __be32 status; |
| fmode_t flags = 0; |
| bool schedule_manager = false; |
| |
| 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 (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG)) |
| flags = FMODE_READ; |
| if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG)) |
| flags |= FMODE_WRITE; |
| if (flags) |
| nfs_expire_unused_delegation_types(cps->clp, flags); |
| |
| if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT)) |
| pnfs_recall_all_layouts(cps->clp); |
| |
| if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) { |
| set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state); |
| schedule_manager = true; |
| } |
| if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) { |
| set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state); |
| schedule_manager = true; |
| } |
| if (schedule_manager) |
| nfs4_schedule_state_manager(cps->clp); |
| |
| 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(void *argp, void *resp, |
| struct cb_process_state *cps) |
| { |
| struct cb_recallslotargs *args = argp; |
| 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; |
| } |
| |
| __be32 nfs4_callback_notify_lock(void *argp, void *resp, |
| struct cb_process_state *cps) |
| { |
| struct cb_notify_lock_args *args = argp; |
| |
| if (!cps->clp) /* set in cb_sequence */ |
| return htonl(NFS4ERR_OP_NOT_IN_SESSION); |
| |
| dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n", |
| rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); |
| |
| /* Don't wake anybody if the string looked bogus */ |
| if (args->cbnl_valid) |
| __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args); |
| |
| return htonl(NFS4_OK); |
| } |
| #endif /* CONFIG_NFS_V4_1 */ |
| #ifdef CONFIG_NFS_V4_2 |
| static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state, |
| struct cb_offloadargs *args) |
| { |
| cp_state->count = args->wr_count; |
| cp_state->error = args->error; |
| if (!args->error) { |
| cp_state->verf.committed = args->wr_writeverf.committed; |
| memcpy(&cp_state->verf.verifier.data[0], |
| &args->wr_writeverf.verifier.data[0], |
| NFS4_VERIFIER_SIZE); |
| } |
| } |
| |
| __be32 nfs4_callback_offload(void *data, void *dummy, |
| struct cb_process_state *cps) |
| { |
| struct cb_offloadargs *args = data; |
| struct nfs_server *server; |
| struct nfs4_copy_state *copy, *tmp_copy; |
| bool found = false; |
| |
| copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS); |
| if (!copy) |
| return htonl(NFS4ERR_SERVERFAULT); |
| |
| spin_lock(&cps->clp->cl_lock); |
| rcu_read_lock(); |
| list_for_each_entry_rcu(server, &cps->clp->cl_superblocks, |
| client_link) { |
| list_for_each_entry(tmp_copy, &server->ss_copies, copies) { |
| if (memcmp(args->coa_stateid.other, |
| tmp_copy->stateid.other, |
| sizeof(args->coa_stateid.other))) |
| continue; |
| nfs4_copy_cb_args(tmp_copy, args); |
| complete(&tmp_copy->completion); |
| found = true; |
| goto out; |
| } |
| } |
| out: |
| rcu_read_unlock(); |
| if (!found) { |
| memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE); |
| nfs4_copy_cb_args(copy, args); |
| list_add_tail(©->copies, &cps->clp->pending_cb_stateids); |
| } else |
| kfree(copy); |
| spin_unlock(&cps->clp->cl_lock); |
| |
| return 0; |
| } |
| #endif /* CONFIG_NFS_V4_2 */ |