diff options
Diffstat (limited to 'fs/nfs/callback_proc.c')
| -rw-r--r-- | fs/nfs/callback_proc.c | 716 |
1 files changed, 716 insertions, 0 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c new file mode 100644 index 000000000..f2a854805 --- /dev/null +++ b/fs/nfs/callback_proc.c @@ -0,0 +1,716 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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(void *argp, void *resp, + struct cb_process_state *cps) +{ + struct cb_getattrargs *args = argp; + struct cb_getattrres *res = resp; + 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 (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; + } + 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 (nfs_have_writebacks(inode)) + res->change_attr++; + res->ctime = timespec64_to_timespec(inode->i_ctime); + res->mtime = timespec64_to_timespec(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) +{ + struct nfs_server *server; + struct inode *inode; + 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 (!pnfs_layout_is_valid(lo)) + continue; + if (stateid != NULL && + !nfs4_stateid_match_other(stateid, &lo->plh_stateid)) + continue; + inode = igrab(lo->plh_inode); + if (!inode) + return ERR_PTR(-EAGAIN); + if (!nfs_sb_active(inode->i_sb)) { + rcu_read_unlock(); + spin_unlock(&clp->cl_lock); + iput(inode); + spin_lock(&clp->cl_lock); + rcu_read_lock(); + return ERR_PTR(-EAGAIN); + } + return inode; + } + } + + 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; + + list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { + list_for_each_entry(lo, &server->layouts, plh_layouts) { + nfsi = NFS_I(lo->plh_inode); + if (nfs_compare_fh(fh, &nfsi->fh)) + continue; + if (nfsi->layout != lo) + continue; + inode = igrab(lo->plh_inode); + if (!inode) + return ERR_PTR(-EAGAIN); + if (!nfs_sb_active(inode->i_sb)) { + rcu_read_unlock(); + spin_unlock(&clp->cl_lock); + iput(inode); + spin_lock(&clp->cl_lock); + rcu_read_lock(); + return ERR_PTR(-EAGAIN); + } + return inode; + } + } + + 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; + + spin_lock(&clp->cl_lock); + rcu_read_lock(); + inode = nfs_layout_find_inode_by_stateid(clp, stateid); + if (inode == ERR_PTR(-ENOENT)) + inode = nfs_layout_find_inode_by_fh(clp, fh); + rcu_read_unlock(); + spin_unlock(&clp->cl_lock); + + 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, 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; + const struct pnfs_layoutdriver_type *ld = NULL; + uint32_t i; + __be32 res = 0; + + if (!cps->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 (!ld || ld->id != dev->cbd_layout_type) { + pnfs_put_layoutdriver(ld); + ld = pnfs_find_layoutdriver(dev->cbd_layout_type); + if (!ld) + continue; + } + nfs4_delete_deviceid(ld, cps->clp, &dev->cbd_dev_id); + } + pnfs_put_layoutdriver(ld); +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) +{ + if (args->csa_slotid > tbl->server_highest_slotid) + return htonl(NFS4ERR_BADSLOT); + + /* Replay */ + if (args->csa_sequenceid == slot->seq_nr) { + if (nfs4_test_locked_slot(tbl, slot->slot_nr)) + return htonl(NFS4ERR_DELAY); + /* Signal process_op to set this error on next op */ + if (args->csa_cachethis == 0) + return htonl(NFS4ERR_RETRY_UNCACHED_REP); + + /* Liar! We never allowed you to set csa_cachethis != 0 */ + return htonl(NFS4ERR_SEQ_FALSE_RETRY); + } + + /* Note: wraparound relies on seq_nr being of type u32 */ + if (likely(args->csa_sequenceid == slot->seq_nr + 1)) + return htonl(NFS4_OK); + + /* Misordered request */ + return htonl(NFS4ERR_SEQ_MISORDERED); +} + +/* + * 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; + + 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); +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 */ |