forked from luck/tmp_suning_uos_patched
beb2a5ec38
According to RFC3530 we're supposed to cache the change attribute at the time the client receives a write delegation. If the inode is clean, a CB_GETATTR callback by the server to the client is supposed to return the cached change attribute. If, OTOH, the inode is dirty, the client should bump the cached change attribute by 1. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
89 lines
2.2 KiB
C
89 lines
2.2 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/config.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_fs.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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#define NFSDBG_FACILITY NFSDBG_CALLBACK
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unsigned nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
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{
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struct nfs4_client *clp;
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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->bitmap[0] = res->bitmap[1] = 0;
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res->status = htonl(NFS4ERR_BADHANDLE);
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clp = nfs4_find_client(&args->addr->sin_addr);
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if (clp == NULL)
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goto out;
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inode = nfs_delegation_find_inode(clp, &args->fh);
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if (inode == NULL)
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goto out_putclient;
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nfsi = NFS_I(inode);
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down_read(&nfsi->rwsem);
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delegation = 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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up_read(&nfsi->rwsem);
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iput(inode);
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out_putclient:
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nfs4_put_client(clp);
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out:
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dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));
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return res->status;
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}
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unsigned nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
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{
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struct nfs4_client *clp;
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struct inode *inode;
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unsigned res;
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res = htonl(NFS4ERR_BADHANDLE);
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clp = nfs4_find_client(&args->addr->sin_addr);
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if (clp == NULL)
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goto out;
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inode = nfs_delegation_find_inode(clp, &args->fh);
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if (inode == NULL)
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goto out_putclient;
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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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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_putclient:
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nfs4_put_client(clp);
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out:
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dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));
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return res;
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}
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