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/*
* 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
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