zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/nfs/callback_proc.c b/ap/os/linux/linux-3.4.x/fs/nfs/callback_proc.c
new file mode 100644
index 0000000..1b5d809
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/nfs/callback_proc.c
@@ -0,0 +1,569 @@
+/*
+ * 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"
+
+#ifdef NFS_DEBUG
+#define NFSDBG_FACILITY NFSDBG_CALLBACK
+#endif
+
+__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)
+ 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->npages != 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();
+ 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);
+ }
+ 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)
+{
+ 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 (nfs_compare_fh(fh, &NFS_I(lo->plh_inode)->fh))
+ continue;
+ ino = igrab(lo->plh_inode);
+ if (!ino)
+ continue;
+ get_layout_hdr(lo);
+ return lo;
+ }
+ }
+
+ return NULL;
+}
+
+static struct pnfs_layout_hdr * get_layout_by_fh(struct nfs_client *clp, struct nfs_fh *fh)
+{
+ struct pnfs_layout_hdr *lo;
+
+ spin_lock(&clp->cl_lock);
+ rcu_read_lock();
+ lo = get_layout_by_fh_locked(clp, fh);
+ 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);
+ if (!lo)
+ return NFS4ERR_NOMATCHING_LAYOUT;
+
+ ino = lo->plh_inode;
+ spin_lock(&ino->i_lock);
+ if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
+ mark_matching_lsegs_invalid(lo, &free_me_list,
+ &args->cbl_range))
+ rv = NFS4ERR_DELAY;
+ else
+ rv = NFS4ERR_NOMATCHING_LAYOUT;
+ pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
+ spin_unlock(&ino->i_lock);
+ pnfs_free_lseg_list(&free_me_list);
+ put_layout_hdr(lo);
+ iput(ino);
+ return rv;
+}
+
+static u32 initiate_bulk_draining(struct nfs_client *clp,
+ struct cb_layoutrecallargs *args)
+{
+ struct nfs_server *server;
+ struct pnfs_layout_hdr *lo;
+ struct inode *ino;
+ u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
+ struct pnfs_layout_hdr *tmp;
+ LIST_HEAD(recall_list);
+ LIST_HEAD(free_me_list);
+ struct pnfs_layout_range range = {
+ .iomode = IOMODE_ANY,
+ .offset = 0,
+ .length = NFS4_MAX_UINT64,
+ };
+
+ spin_lock(&clp->cl_lock);
+ rcu_read_lock();
+ list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
+ if ((args->cbl_recall_type == RETURN_FSID) &&
+ memcmp(&server->fsid, &args->cbl_fsid,
+ sizeof(struct nfs_fsid)))
+ continue;
+
+ list_for_each_entry(lo, &server->layouts, plh_layouts) {
+ if (!igrab(lo->plh_inode))
+ continue;
+ get_layout_hdr(lo);
+ BUG_ON(!list_empty(&lo->plh_bulk_recall));
+ list_add(&lo->plh_bulk_recall, &recall_list);
+ }
+ }
+ rcu_read_unlock();
+ spin_unlock(&clp->cl_lock);
+
+ list_for_each_entry_safe(lo, tmp,
+ &recall_list, plh_bulk_recall) {
+ ino = lo->plh_inode;
+ spin_lock(&ino->i_lock);
+ set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
+ if (mark_matching_lsegs_invalid(lo, &free_me_list, &range))
+ rv = NFS4ERR_DELAY;
+ list_del_init(&lo->plh_bulk_recall);
+ spin_unlock(&ino->i_lock);
+ pnfs_free_lseg_list(&free_me_list);
+ put_layout_hdr(lo);
+ iput(ino);
+ }
+ return rv;
+}
+
+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:
+ if (dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE)
+ dprintk("%s: NOTIFY_DEVICEID4_CHANGE not supported, "
+ "deleting instead\n", __func__);
+ 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 %d seqid %d\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: %d\n", __func__, slot->seq_nr);
+
+ /* Normal */
+ if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
+ slot->seq_nr++;
+ goto out_ok;
+ }
+
+ /* Replay */
+ if (args->csa_sequenceid == slot->seq_nr) {
+ dprintk("%s seqid %d 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 nfs_client *clp;
+ int i;
+ __be32 status = htonl(NFS4ERR_BADSESSION);
+
+ clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, &args->csa_sessionid);
+ if (clp == NULL)
+ goto out;
+
+ tbl = &clp->cl_session->bc_slot_table;
+
+ spin_lock(&tbl->slot_tbl_lock);
+ /* state manager is resetting the session */
+ if (test_bit(NFS4_SESSION_DRAINING, &clp->cl_session->session_state)) {
+ spin_unlock(&tbl->slot_tbl_lock);
+ 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;
+ }
+
+ status = validate_seqid(&clp->cl_session->bc_slot_table, args);
+ spin_unlock(&tbl->slot_tbl_lock);
+ if (status)
+ goto out;
+
+ 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;
+ }
+
+ 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;
+
+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;
+
+ 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_all_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 max slots %d\n",
+ rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
+ args->crsa_target_max_slots);
+
+ fc_tbl = &cps->clp->cl_session->fc_slot_table;
+
+ status = htonl(NFS4ERR_BAD_HIGH_SLOT);
+ if (args->crsa_target_max_slots > fc_tbl->max_slots ||
+ args->crsa_target_max_slots < 1)
+ goto out;
+
+ status = htonl(NFS4_OK);
+ if (args->crsa_target_max_slots == fc_tbl->max_slots)
+ goto out;
+
+ fc_tbl->target_max_slots = args->crsa_target_max_slots;
+ nfs41_handle_recall_slot(cps->clp);
+out:
+ dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
+ return status;
+}
+#endif /* CONFIG_NFS_V4_1 */