![Fred Isaman](/assets/img/avatar_default.png)
The pnfs code was using throughout the lock order i_lock, cl_lock. This conflicts with the nfs delegation code. Rework the pnfs code to avoid taking both locks simultaneously. Currently the code takes the double lock to add/remove the layout to a nfs_client list, while atomically checking that the list of lsegs is empty. To avoid this, we rely on existing serializations. When a layout is initialized with lseg count equal zero, LAYOUTGET's openstateid serialization is in effect, making it safe to assume it stays zero unless we change it. And once a layout's lseg count drops to zero, it is set as DESTROYED and so will stay at zero. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
502 lines
13 KiB
C
502 lines
13 KiB
C
/*
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* linux/fs/nfs/callback_proc.c
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*
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* Copyright (C) 2004 Trond Myklebust
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*
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* NFSv4 callback procedures
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*/
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#include <linux/nfs4.h>
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#include <linux/nfs_fs.h>
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#include <linux/slab.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "delegation.h"
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#include "internal.h"
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#include "pnfs.h"
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#ifdef NFS_DEBUG
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#define NFSDBG_FACILITY NFSDBG_CALLBACK
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#endif
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__be32 nfs4_callback_getattr(struct cb_getattrargs *args,
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struct cb_getattrres *res,
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struct cb_process_state *cps)
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{
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struct nfs_delegation *delegation;
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struct nfs_inode *nfsi;
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struct inode *inode;
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res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
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if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
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goto out;
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res->bitmap[0] = res->bitmap[1] = 0;
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res->status = htonl(NFS4ERR_BADHANDLE);
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dprintk("NFS: GETATTR callback request from %s\n",
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rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
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inode = nfs_delegation_find_inode(cps->clp, &args->fh);
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if (inode == NULL)
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goto out;
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nfsi = NFS_I(inode);
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rcu_read_lock();
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delegation = rcu_dereference(nfsi->delegation);
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if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
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goto out_iput;
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res->size = i_size_read(inode);
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res->change_attr = delegation->change_attr;
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if (nfsi->npages != 0)
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res->change_attr++;
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res->ctime = inode->i_ctime;
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res->mtime = inode->i_mtime;
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res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
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args->bitmap[0];
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res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
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args->bitmap[1];
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res->status = 0;
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out_iput:
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rcu_read_unlock();
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iput(inode);
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out:
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dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
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return res->status;
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}
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__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
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struct cb_process_state *cps)
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{
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struct inode *inode;
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__be32 res;
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res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
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if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
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goto out;
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dprintk("NFS: RECALL callback request from %s\n",
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rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
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res = htonl(NFS4ERR_BADHANDLE);
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inode = nfs_delegation_find_inode(cps->clp, &args->fh);
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if (inode == NULL)
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goto out;
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/* Set up a helper thread to actually return the delegation */
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switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
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case 0:
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res = 0;
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break;
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case -ENOENT:
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if (res != 0)
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res = htonl(NFS4ERR_BAD_STATEID);
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break;
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default:
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res = htonl(NFS4ERR_RESOURCE);
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}
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iput(inode);
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out:
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dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
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return res;
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}
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int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
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{
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if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data,
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sizeof(delegation->stateid.data)) != 0)
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return 0;
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return 1;
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}
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#if defined(CONFIG_NFS_V4_1)
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static u32 initiate_file_draining(struct nfs_client *clp,
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struct cb_layoutrecallargs *args)
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{
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struct pnfs_layout_hdr *lo;
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struct inode *ino;
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bool found = false;
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u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
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LIST_HEAD(free_me_list);
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spin_lock(&clp->cl_lock);
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list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
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if (nfs_compare_fh(&args->cbl_fh,
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&NFS_I(lo->plh_inode)->fh))
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continue;
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ino = igrab(lo->plh_inode);
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if (!ino)
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continue;
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found = true;
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/* Without this, layout can be freed as soon
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* as we release cl_lock.
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*/
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get_layout_hdr(lo);
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break;
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}
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spin_unlock(&clp->cl_lock);
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if (!found)
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return NFS4ERR_NOMATCHING_LAYOUT;
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spin_lock(&ino->i_lock);
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if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
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mark_matching_lsegs_invalid(lo, &free_me_list,
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args->cbl_range.iomode))
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rv = NFS4ERR_DELAY;
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else
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rv = NFS4ERR_NOMATCHING_LAYOUT;
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pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
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spin_unlock(&ino->i_lock);
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pnfs_free_lseg_list(&free_me_list);
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put_layout_hdr(lo);
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iput(ino);
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return rv;
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}
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static u32 initiate_bulk_draining(struct nfs_client *clp,
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struct cb_layoutrecallargs *args)
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{
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struct pnfs_layout_hdr *lo;
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struct inode *ino;
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u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
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struct pnfs_layout_hdr *tmp;
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LIST_HEAD(recall_list);
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LIST_HEAD(free_me_list);
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struct pnfs_layout_range range = {
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.iomode = IOMODE_ANY,
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.offset = 0,
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.length = NFS4_MAX_UINT64,
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};
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spin_lock(&clp->cl_lock);
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list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
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if ((args->cbl_recall_type == RETURN_FSID) &&
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memcmp(&NFS_SERVER(lo->plh_inode)->fsid,
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&args->cbl_fsid, sizeof(struct nfs_fsid)))
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continue;
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if (!igrab(lo->plh_inode))
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continue;
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get_layout_hdr(lo);
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BUG_ON(!list_empty(&lo->plh_bulk_recall));
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list_add(&lo->plh_bulk_recall, &recall_list);
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}
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spin_unlock(&clp->cl_lock);
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list_for_each_entry_safe(lo, tmp,
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&recall_list, plh_bulk_recall) {
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ino = lo->plh_inode;
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spin_lock(&ino->i_lock);
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set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
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if (mark_matching_lsegs_invalid(lo, &free_me_list, range.iomode))
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rv = NFS4ERR_DELAY;
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list_del_init(&lo->plh_bulk_recall);
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spin_unlock(&ino->i_lock);
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pnfs_free_lseg_list(&free_me_list);
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put_layout_hdr(lo);
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iput(ino);
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}
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return rv;
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}
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static u32 do_callback_layoutrecall(struct nfs_client *clp,
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struct cb_layoutrecallargs *args)
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{
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u32 res = NFS4ERR_DELAY;
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dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
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if (test_and_set_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state))
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goto out;
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if (args->cbl_recall_type == RETURN_FILE)
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res = initiate_file_draining(clp, args);
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else
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res = initiate_bulk_draining(clp, args);
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clear_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state);
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out:
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dprintk("%s returning %i\n", __func__, res);
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return res;
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}
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__be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
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void *dummy, struct cb_process_state *cps)
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{
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u32 res;
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dprintk("%s: -->\n", __func__);
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if (cps->clp)
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res = do_callback_layoutrecall(cps->clp, args);
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else
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res = NFS4ERR_OP_NOT_IN_SESSION;
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dprintk("%s: exit with status = %d\n", __func__, res);
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return cpu_to_be32(res);
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}
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static void pnfs_recall_all_layouts(struct nfs_client *clp)
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{
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struct cb_layoutrecallargs args;
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/* Pretend we got a CB_LAYOUTRECALL(ALL) */
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memset(&args, 0, sizeof(args));
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args.cbl_recall_type = RETURN_ALL;
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/* FIXME we ignore errors, what should we do? */
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do_callback_layoutrecall(clp, &args);
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}
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int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
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{
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if (delegation == NULL)
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return 0;
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if (stateid->stateid.seqid != 0)
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return 0;
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if (memcmp(&delegation->stateid.stateid.other,
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&stateid->stateid.other,
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NFS4_STATEID_OTHER_SIZE))
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return 0;
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return 1;
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}
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/*
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* Validate the sequenceID sent by the server.
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* Return success if the sequenceID is one more than what we last saw on
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* this slot, accounting for wraparound. Increments the slot's sequence.
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*
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* We don't yet implement a duplicate request cache, instead we set the
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* back channel ca_maxresponsesize_cached to zero. This is OK for now
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* since we only currently implement idempotent callbacks anyway.
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*
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* We have a single slot backchannel at this time, so we don't bother
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* checking the used_slots bit array on the table. The lower layer guarantees
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* a single outstanding callback request at a time.
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*/
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static __be32
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validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
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{
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struct nfs4_slot *slot;
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dprintk("%s enter. slotid %d seqid %d\n",
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__func__, args->csa_slotid, args->csa_sequenceid);
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if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
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return htonl(NFS4ERR_BADSLOT);
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slot = tbl->slots + args->csa_slotid;
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dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
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/* Normal */
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if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
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slot->seq_nr++;
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return htonl(NFS4_OK);
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}
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/* Replay */
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if (args->csa_sequenceid == slot->seq_nr) {
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dprintk("%s seqid %d is a replay\n",
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__func__, args->csa_sequenceid);
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/* Signal process_op to set this error on next op */
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if (args->csa_cachethis == 0)
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return htonl(NFS4ERR_RETRY_UNCACHED_REP);
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/* The ca_maxresponsesize_cached is 0 with no DRC */
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else if (args->csa_cachethis == 1)
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return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
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}
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/* Wraparound */
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if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
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slot->seq_nr = 1;
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return htonl(NFS4_OK);
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}
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/* Misordered request */
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return htonl(NFS4ERR_SEQ_MISORDERED);
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}
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/*
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* For each referring call triple, check the session's slot table for
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* a match. If the slot is in use and the sequence numbers match, the
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* client is still waiting for a response to the original request.
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*/
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static bool referring_call_exists(struct nfs_client *clp,
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uint32_t nrclists,
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struct referring_call_list *rclists)
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{
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bool status = 0;
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int i, j;
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struct nfs4_session *session;
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struct nfs4_slot_table *tbl;
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struct referring_call_list *rclist;
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struct referring_call *ref;
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/*
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* XXX When client trunking is implemented, this becomes
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* a session lookup from within the loop
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*/
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session = clp->cl_session;
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tbl = &session->fc_slot_table;
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for (i = 0; i < nrclists; i++) {
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rclist = &rclists[i];
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if (memcmp(session->sess_id.data,
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rclist->rcl_sessionid.data,
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NFS4_MAX_SESSIONID_LEN) != 0)
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continue;
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for (j = 0; j < rclist->rcl_nrefcalls; j++) {
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ref = &rclist->rcl_refcalls[j];
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dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
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"slotid %u\n", __func__,
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((u32 *)&rclist->rcl_sessionid.data)[0],
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((u32 *)&rclist->rcl_sessionid.data)[1],
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((u32 *)&rclist->rcl_sessionid.data)[2],
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((u32 *)&rclist->rcl_sessionid.data)[3],
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ref->rc_sequenceid, ref->rc_slotid);
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spin_lock(&tbl->slot_tbl_lock);
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status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
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tbl->slots[ref->rc_slotid].seq_nr ==
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ref->rc_sequenceid);
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spin_unlock(&tbl->slot_tbl_lock);
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if (status)
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goto out;
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}
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}
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out:
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return status;
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}
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__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
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struct cb_sequenceres *res,
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struct cb_process_state *cps)
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{
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struct nfs_client *clp;
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int i;
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__be32 status = htonl(NFS4ERR_BADSESSION);
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cps->clp = NULL;
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clp = nfs4_find_client_sessionid(args->csa_addr, &args->csa_sessionid);
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if (clp == NULL)
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goto out;
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/* state manager is resetting the session */
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if (test_bit(NFS4_SESSION_DRAINING, &clp->cl_session->session_state)) {
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status = NFS4ERR_DELAY;
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goto out;
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}
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status = validate_seqid(&clp->cl_session->bc_slot_table, args);
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if (status)
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goto out;
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/*
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* Check for pending referring calls. If a match is found, a
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* related callback was received before the response to the original
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* call.
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*/
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if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
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status = htonl(NFS4ERR_DELAY);
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goto out;
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}
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memcpy(&res->csr_sessionid, &args->csa_sessionid,
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sizeof(res->csr_sessionid));
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res->csr_sequenceid = args->csa_sequenceid;
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res->csr_slotid = args->csa_slotid;
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res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
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res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
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nfs4_cb_take_slot(clp);
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out:
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cps->clp = clp; /* put in nfs4_callback_compound */
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for (i = 0; i < args->csa_nrclists; i++)
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kfree(args->csa_rclists[i].rcl_refcalls);
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kfree(args->csa_rclists);
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if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
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cps->drc_status = status;
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status = 0;
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} else
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res->csr_status = status;
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dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
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ntohl(status), ntohl(res->csr_status));
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return status;
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}
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static bool
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validate_bitmap_values(unsigned long mask)
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{
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return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
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}
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__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
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struct cb_process_state *cps)
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{
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__be32 status;
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fmode_t flags = 0;
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status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
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if (!cps->clp) /* set in cb_sequence */
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goto out;
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dprintk("NFS: RECALL_ANY callback request from %s\n",
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rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
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status = cpu_to_be32(NFS4ERR_INVAL);
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if (!validate_bitmap_values(args->craa_type_mask))
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goto out;
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status = cpu_to_be32(NFS4_OK);
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if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
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&args->craa_type_mask))
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flags = FMODE_READ;
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if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
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&args->craa_type_mask))
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flags |= FMODE_WRITE;
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if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
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&args->craa_type_mask))
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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("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 */
|