[linux-block.git] / fs / nfs / callback_proc.c

/*
 * linux/fs/nfs/callback_proc.c
 *
 * Copyright (C) 2004 Trond Myklebust
 *
 * NFSv4 callback procedures
 */
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
#include "internal.h"

#ifdef NFS_DEBUG
#define NFSDBG_FACILITY NFSDBG_CALLBACK
#endif
 
__be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
{
	struct nfs_client *clp;
	struct nfs_delegation *delegation;
	struct nfs_inode *nfsi;
	struct inode *inode;

	res->bitmap[0] = res->bitmap[1] = 0;
	res->status = htonl(NFS4ERR_BADHANDLE);
	clp = nfs_find_client(args->addr, 4);
	if (clp == NULL)
		goto out;

	dprintk("NFS: GETATTR callback request from %s\n",
		rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	inode = nfs_delegation_find_inode(clp, &args->fh);
	if (inode == NULL)
		goto out_putclient;
	nfsi = NFS_I(inode);
	down_read(&nfsi->rwsem);
	delegation = 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:
	up_read(&nfsi->rwsem);
	iput(inode);
out_putclient:
	nfs_put_client(clp);
out:
	dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));
	return res->status;
}

__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
{
	struct nfs_client *clp;
	struct inode *inode;
	__be32 res;
	
	res = htonl(NFS4ERR_BADHANDLE);
	clp = nfs_find_client(args->addr, 4);
	if (clp == NULL)
		goto out;

	dprintk("NFS: RECALL callback request from %s\n",
		rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));

	do {
		struct nfs_client *prev = clp;

		inode = nfs_delegation_find_inode(clp, &args->fh);
		if (inode != NULL) {
			/* 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:
					if (res != 0)
						res = htonl(NFS4ERR_BAD_STATEID);
					break;
				default:
					res = htonl(NFS4ERR_RESOURCE);
			}
			iput(inode);
		}
		clp = nfs_find_client_next(prev);
		nfs_put_client(prev);
	} while (clp != NULL);
out:
	dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));
	return res;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/nfs/callback_proc.c
	3	*
	4	* Copyright (C) 2004 Trond Myklebust
	5	*
	6	* NFSv4 callback procedures
	7	*/
1da177e4 LT	8	#include <linux/nfs4.h>
1da177e4 LT	9	#include <linux/nfs_fs.h>
4ce79717	10	#include "nfs4_fs.h"
1da177e4 LT	11	#include "callback.h"
1da177e4 LT	12	#include "delegation.h"
24c8dbbb	13	#include "internal.h"
1da177e4	14
1d98fe67	15	#ifdef NFS_DEBUG
1da177e4	16	#define NFSDBG_FACILITY NFSDBG_CALLBACK
1d98fe67	17	#endif
1da177e4	18
e6f684f6	19	__be32 nfs4_callback_getattr(struct cb_getattrargs args, struct cb_getattrres res)
1da177e4	20	{
adfa6f98	21	struct nfs_client *clp;
1da177e4 LT	22	struct nfs_delegation *delegation;
	23	struct nfs_inode *nfsi;
	24	struct inode *inode;
1d98fe67	25
1da177e4 LT	26	res->bitmap[0] = res->bitmap[1] = 0;
1da177e4 LT	27	res->status = htonl(NFS4ERR_BADHANDLE);
ff052645	28	clp = nfs_find_client(args->addr, 4);
1da177e4 LT	29	if (clp == NULL)
1da177e4 LT	30	goto out;
1d98fe67 CL	31
	32	dprintk("NFS: GETATTR callback request from %s\n",
	33	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	34
1da177e4 LT	35	inode = nfs_delegation_find_inode(clp, &args->fh);
	36	if (inode == NULL)
	37	goto out_putclient;
	38	nfsi = NFS_I(inode);
	39	down_read(&nfsi->rwsem);
	40	delegation = nfsi->delegation;
	41	if (delegation == NULL \|\| (delegation->type & FMODE_WRITE) == 0)
	42	goto out_iput;
	43	res->size = i_size_read(inode);
beb2a5ec TM	44	res->change_attr = delegation->change_attr;
	45	if (nfsi->npages != 0)
	46	res->change_attr++;
1da177e4 LT	47	res->ctime = inode->i_ctime;
	48	res->mtime = inode->i_mtime;
	49	res->bitmap[0] = (FATTR4_WORD0_CHANGE\|FATTR4_WORD0_SIZE) &
	50	args->bitmap[0];
	51	res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA\|FATTR4_WORD1_TIME_MODIFY) &
	52	args->bitmap[1];
	53	res->status = 0;
	54	out_iput:
	55	up_read(&nfsi->rwsem);
	56	iput(inode);
	57	out_putclient:
24c8dbbb	58	nfs_put_client(clp);
1da177e4 LT	59	out:
	60	dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));
	61	return res->status;
	62	}
	63
e6f684f6	64	__be32 nfs4_callback_recall(struct cb_recallargs args, void dummy)
1da177e4	65	{
adfa6f98	66	struct nfs_client *clp;
1da177e4	67	struct inode *inode;
e6f684f6	68	__be32 res;
1da177e4 LT	69
1da177e4 LT	70	res = htonl(NFS4ERR_BADHANDLE);
ff052645	71	clp = nfs_find_client(args->addr, 4);
1da177e4 LT	72	if (clp == NULL)
1da177e4 LT	73	goto out;
1d98fe67 CL	74
	75	dprintk("NFS: RECALL callback request from %s\n",
	76	rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
	77
3fbd67ad TM	78	do {
	79	struct nfs_client *prev = clp;
	80
	81	inode = nfs_delegation_find_inode(clp, &args->fh);
	82	if (inode != NULL) {
	83	/* Set up a helper thread to actually return the delegation */
	84	switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {
	85	case 0:
	86	res = 0;
	87	break;
	88	case -ENOENT:
	89	if (res != 0)
	90	res = htonl(NFS4ERR_BAD_STATEID);
	91	break;
	92	default:
	93	res = htonl(NFS4ERR_RESOURCE);
	94	}
	95	iput(inode);
	96	}
	97	clp = nfs_find_client_next(prev);
	98	nfs_put_client(prev);
	99	} while (clp != NULL);
1da177e4 LT	100	out:
	101	dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));
	102	return res;
	103	}