678 lines
17 KiB
C
678 lines
17 KiB
C
/*
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* linux/fs/nfs/proc.c
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*
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* Copyright (C) 1992, 1993, 1994 Rick Sladkey
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*
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* OS-independent nfs remote procedure call functions
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*
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* Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers
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* so at last we can have decent(ish) throughput off a
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* Sun server.
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*
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* Coding optimized and cleaned up by Florian La Roche.
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* Note: Error returns are optimized for NFS_OK, which isn't translated via
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* nfs_stat_to_errno(), but happens to be already the right return code.
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*
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* Also, the code currently doesn't check the size of the packet, when
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* it decodes the packet.
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*
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* Feel free to fix it and mail me the diffs if it worries you.
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*
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* Completely rewritten to support the new RPC call interface;
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* rewrote and moved the entire XDR stuff to xdr.c
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* --Olaf Kirch June 1996
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*
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* The code below initializes all auto variables explicitly, otherwise
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* it will fail to work as a module (gcc generates a memset call for an
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* incomplete struct).
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*/
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#include <linux/types.h>
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#include <linux/param.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/mm.h>
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#include <linux/utsname.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/in.h>
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#include <linux/pagemap.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfs.h>
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#include <linux/nfs2.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_page.h>
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#include <linux/lockd/bind.h>
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#include <linux/smp_lock.h>
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#define NFSDBG_FACILITY NFSDBG_PROC
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extern struct rpc_procinfo nfs_procedures[];
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/*
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* Bare-bones access to getattr: this is for nfs_read_super.
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*/
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static int
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nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
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struct nfs_fsinfo *info)
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{
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struct nfs_fattr *fattr = info->fattr;
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struct nfs2_fsstat fsinfo;
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int status;
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dprintk("%s: call getattr\n", __FUNCTION__);
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nfs_fattr_init(fattr);
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status = rpc_call(server->client_sys, NFSPROC_GETATTR, fhandle, fattr, 0);
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dprintk("%s: reply getattr: %d\n", __FUNCTION__, status);
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if (status)
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return status;
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dprintk("%s: call statfs\n", __FUNCTION__);
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status = rpc_call(server->client_sys, NFSPROC_STATFS, fhandle, &fsinfo, 0);
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dprintk("%s: reply statfs: %d\n", __FUNCTION__, status);
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if (status)
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return status;
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info->rtmax = NFS_MAXDATA;
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info->rtpref = fsinfo.tsize;
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info->rtmult = fsinfo.bsize;
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info->wtmax = NFS_MAXDATA;
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info->wtpref = fsinfo.tsize;
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info->wtmult = fsinfo.bsize;
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info->dtpref = fsinfo.tsize;
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info->maxfilesize = 0x7FFFFFFF;
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info->lease_time = 0;
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return 0;
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}
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/*
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* One function for each procedure in the NFS protocol.
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*/
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static int
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nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
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struct nfs_fattr *fattr)
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{
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int status;
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dprintk("NFS call getattr\n");
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nfs_fattr_init(fattr);
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status = rpc_call(server->client, NFSPROC_GETATTR,
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fhandle, fattr, 0);
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dprintk("NFS reply getattr: %d\n", status);
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return status;
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}
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static int
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nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
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struct iattr *sattr)
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{
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struct inode *inode = dentry->d_inode;
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struct nfs_sattrargs arg = {
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.fh = NFS_FH(inode),
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.sattr = sattr
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};
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int status;
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dprintk("NFS call setattr\n");
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nfs_fattr_init(fattr);
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status = rpc_call(NFS_CLIENT(inode), NFSPROC_SETATTR, &arg, fattr, 0);
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if (status == 0)
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nfs_setattr_update_inode(inode, sattr);
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dprintk("NFS reply setattr: %d\n", status);
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return status;
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}
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static int
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nfs_proc_lookup(struct inode *dir, struct qstr *name,
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struct nfs_fh *fhandle, struct nfs_fattr *fattr)
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{
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struct nfs_diropargs arg = {
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.fh = NFS_FH(dir),
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.name = name->name,
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.len = name->len
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};
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struct nfs_diropok res = {
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.fh = fhandle,
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.fattr = fattr
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};
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int status;
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dprintk("NFS call lookup %s\n", name->name);
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nfs_fattr_init(fattr);
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status = rpc_call(NFS_CLIENT(dir), NFSPROC_LOOKUP, &arg, &res, 0);
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dprintk("NFS reply lookup: %d\n", status);
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return status;
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}
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static int nfs_proc_readlink(struct inode *inode, struct page *page,
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unsigned int pgbase, unsigned int pglen)
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{
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struct nfs_readlinkargs args = {
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.fh = NFS_FH(inode),
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.pgbase = pgbase,
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.pglen = pglen,
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.pages = &page
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};
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int status;
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dprintk("NFS call readlink\n");
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status = rpc_call(NFS_CLIENT(inode), NFSPROC_READLINK, &args, NULL, 0);
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dprintk("NFS reply readlink: %d\n", status);
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return status;
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}
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static int nfs_proc_read(struct nfs_read_data *rdata)
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{
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int flags = rdata->flags;
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struct inode * inode = rdata->inode;
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struct nfs_fattr * fattr = rdata->res.fattr;
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struct rpc_message msg = {
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.rpc_proc = &nfs_procedures[NFSPROC_READ],
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.rpc_argp = &rdata->args,
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.rpc_resp = &rdata->res,
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.rpc_cred = rdata->cred,
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};
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int status;
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dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
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(long long) rdata->args.offset);
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nfs_fattr_init(fattr);
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status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
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if (status >= 0) {
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nfs_refresh_inode(inode, fattr);
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/* Emulate the eof flag, which isn't normally needed in NFSv2
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* as it is guaranteed to always return the file attributes
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*/
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if (rdata->args.offset + rdata->args.count >= fattr->size)
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rdata->res.eof = 1;
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}
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dprintk("NFS reply read: %d\n", status);
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return status;
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}
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static int nfs_proc_write(struct nfs_write_data *wdata)
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{
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int flags = wdata->flags;
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struct inode * inode = wdata->inode;
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struct nfs_fattr * fattr = wdata->res.fattr;
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struct rpc_message msg = {
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.rpc_proc = &nfs_procedures[NFSPROC_WRITE],
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.rpc_argp = &wdata->args,
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.rpc_resp = &wdata->res,
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.rpc_cred = wdata->cred,
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};
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int status;
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dprintk("NFS call write %d @ %Ld\n", wdata->args.count,
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(long long) wdata->args.offset);
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nfs_fattr_init(fattr);
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status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
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if (status >= 0) {
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nfs_post_op_update_inode(inode, fattr);
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wdata->res.count = wdata->args.count;
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wdata->verf.committed = NFS_FILE_SYNC;
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}
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dprintk("NFS reply write: %d\n", status);
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return status < 0? status : wdata->res.count;
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}
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static int
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nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
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int flags, struct nameidata *nd)
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{
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struct nfs_fh fhandle;
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struct nfs_fattr fattr;
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struct nfs_createargs arg = {
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.fh = NFS_FH(dir),
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.name = dentry->d_name.name,
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.len = dentry->d_name.len,
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.sattr = sattr
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};
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struct nfs_diropok res = {
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.fh = &fhandle,
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.fattr = &fattr
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};
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int status;
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nfs_fattr_init(&fattr);
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dprintk("NFS call create %s\n", dentry->d_name.name);
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status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0);
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if (status == 0)
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status = nfs_instantiate(dentry, &fhandle, &fattr);
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dprintk("NFS reply create: %d\n", status);
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return status;
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}
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/*
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* In NFSv2, mknod is grafted onto the create call.
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*/
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static int
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nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
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dev_t rdev)
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{
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struct nfs_fh fhandle;
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struct nfs_fattr fattr;
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struct nfs_createargs arg = {
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.fh = NFS_FH(dir),
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.name = dentry->d_name.name,
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.len = dentry->d_name.len,
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.sattr = sattr
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};
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struct nfs_diropok res = {
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.fh = &fhandle,
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.fattr = &fattr
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};
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int status, mode;
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dprintk("NFS call mknod %s\n", dentry->d_name.name);
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mode = sattr->ia_mode;
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if (S_ISFIFO(mode)) {
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sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
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sattr->ia_valid &= ~ATTR_SIZE;
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} else if (S_ISCHR(mode) || S_ISBLK(mode)) {
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sattr->ia_valid |= ATTR_SIZE;
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sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
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}
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nfs_fattr_init(&fattr);
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status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0);
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nfs_mark_for_revalidate(dir);
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if (status == -EINVAL && S_ISFIFO(mode)) {
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sattr->ia_mode = mode;
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nfs_fattr_init(&fattr);
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status = rpc_call(NFS_CLIENT(dir), NFSPROC_CREATE, &arg, &res, 0);
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}
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if (status == 0)
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status = nfs_instantiate(dentry, &fhandle, &fattr);
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dprintk("NFS reply mknod: %d\n", status);
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return status;
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}
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static int
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nfs_proc_remove(struct inode *dir, struct qstr *name)
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{
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struct nfs_diropargs arg = {
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.fh = NFS_FH(dir),
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.name = name->name,
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.len = name->len
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};
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struct rpc_message msg = {
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.rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
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.rpc_argp = &arg,
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.rpc_resp = NULL,
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.rpc_cred = NULL
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};
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int status;
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dprintk("NFS call remove %s\n", name->name);
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status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
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nfs_mark_for_revalidate(dir);
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dprintk("NFS reply remove: %d\n", status);
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return status;
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}
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static int
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nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
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{
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struct nfs_diropargs *arg;
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arg = (struct nfs_diropargs *)kmalloc(sizeof(*arg), GFP_KERNEL);
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if (!arg)
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return -ENOMEM;
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arg->fh = NFS_FH(dir->d_inode);
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arg->name = name->name;
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arg->len = name->len;
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msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
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msg->rpc_argp = arg;
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return 0;
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}
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static int
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nfs_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
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{
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struct rpc_message *msg = &task->tk_msg;
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if (msg->rpc_argp) {
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nfs_mark_for_revalidate(dir->d_inode);
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kfree(msg->rpc_argp);
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}
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return 0;
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}
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static int
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nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
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struct inode *new_dir, struct qstr *new_name)
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{
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struct nfs_renameargs arg = {
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.fromfh = NFS_FH(old_dir),
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.fromname = old_name->name,
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.fromlen = old_name->len,
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.tofh = NFS_FH(new_dir),
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.toname = new_name->name,
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.tolen = new_name->len
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};
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int status;
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dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
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status = rpc_call(NFS_CLIENT(old_dir), NFSPROC_RENAME, &arg, NULL, 0);
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nfs_mark_for_revalidate(old_dir);
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nfs_mark_for_revalidate(new_dir);
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dprintk("NFS reply rename: %d\n", status);
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return status;
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}
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static int
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nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
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{
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struct nfs_linkargs arg = {
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.fromfh = NFS_FH(inode),
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.tofh = NFS_FH(dir),
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.toname = name->name,
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.tolen = name->len
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};
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int status;
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dprintk("NFS call link %s\n", name->name);
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status = rpc_call(NFS_CLIENT(inode), NFSPROC_LINK, &arg, NULL, 0);
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nfs_mark_for_revalidate(inode);
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nfs_mark_for_revalidate(dir);
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dprintk("NFS reply link: %d\n", status);
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return status;
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}
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static int
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nfs_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path,
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struct iattr *sattr, struct nfs_fh *fhandle,
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struct nfs_fattr *fattr)
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{
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struct nfs_symlinkargs arg = {
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.fromfh = NFS_FH(dir),
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.fromname = name->name,
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.fromlen = name->len,
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.topath = path->name,
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.tolen = path->len,
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.sattr = sattr
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};
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int status;
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if (path->len > NFS2_MAXPATHLEN)
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return -ENAMETOOLONG;
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dprintk("NFS call symlink %s -> %s\n", name->name, path->name);
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nfs_fattr_init(fattr);
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fhandle->size = 0;
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status = rpc_call(NFS_CLIENT(dir), NFSPROC_SYMLINK, &arg, NULL, 0);
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nfs_mark_for_revalidate(dir);
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dprintk("NFS reply symlink: %d\n", status);
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return status;
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}
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static int
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nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
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{
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struct nfs_fh fhandle;
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struct nfs_fattr fattr;
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struct nfs_createargs arg = {
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.fh = NFS_FH(dir),
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.name = dentry->d_name.name,
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.len = dentry->d_name.len,
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.sattr = sattr
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};
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struct nfs_diropok res = {
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.fh = &fhandle,
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.fattr = &fattr
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};
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int status;
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dprintk("NFS call mkdir %s\n", dentry->d_name.name);
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nfs_fattr_init(&fattr);
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status = rpc_call(NFS_CLIENT(dir), NFSPROC_MKDIR, &arg, &res, 0);
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nfs_mark_for_revalidate(dir);
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if (status == 0)
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status = nfs_instantiate(dentry, &fhandle, &fattr);
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dprintk("NFS reply mkdir: %d\n", status);
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return status;
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}
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static int
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nfs_proc_rmdir(struct inode *dir, struct qstr *name)
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{
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struct nfs_diropargs arg = {
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.fh = NFS_FH(dir),
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.name = name->name,
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.len = name->len
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};
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int status;
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dprintk("NFS call rmdir %s\n", name->name);
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status = rpc_call(NFS_CLIENT(dir), NFSPROC_RMDIR, &arg, NULL, 0);
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nfs_mark_for_revalidate(dir);
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dprintk("NFS reply rmdir: %d\n", status);
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return status;
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}
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/*
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* The READDIR implementation is somewhat hackish - we pass a temporary
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* buffer to the encode function, which installs it in the receive
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* the receive iovec. The decode function just parses the reply to make
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* sure it is syntactically correct; the entries itself are decoded
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* from nfs_readdir by calling the decode_entry function directly.
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*/
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static int
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nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
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u64 cookie, struct page *page, unsigned int count, int plus)
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{
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struct inode *dir = dentry->d_inode;
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struct nfs_readdirargs arg = {
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.fh = NFS_FH(dir),
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.cookie = cookie,
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.count = count,
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.pages = &page
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};
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struct rpc_message msg = {
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.rpc_proc = &nfs_procedures[NFSPROC_READDIR],
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.rpc_argp = &arg,
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.rpc_resp = NULL,
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.rpc_cred = cred
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};
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int status;
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lock_kernel();
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dprintk("NFS call readdir %d\n", (unsigned int)cookie);
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status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
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dprintk("NFS reply readdir: %d\n", status);
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unlock_kernel();
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return status;
|
|
}
|
|
|
|
static int
|
|
nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
|
|
struct nfs_fsstat *stat)
|
|
{
|
|
struct nfs2_fsstat fsinfo;
|
|
int status;
|
|
|
|
dprintk("NFS call statfs\n");
|
|
nfs_fattr_init(stat->fattr);
|
|
status = rpc_call(server->client, NFSPROC_STATFS, fhandle, &fsinfo, 0);
|
|
dprintk("NFS reply statfs: %d\n", status);
|
|
if (status)
|
|
goto out;
|
|
stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
|
|
stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
|
|
stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
|
|
stat->tfiles = 0;
|
|
stat->ffiles = 0;
|
|
stat->afiles = 0;
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
|
|
struct nfs_fsinfo *info)
|
|
{
|
|
struct nfs2_fsstat fsinfo;
|
|
int status;
|
|
|
|
dprintk("NFS call fsinfo\n");
|
|
nfs_fattr_init(info->fattr);
|
|
status = rpc_call(server->client, NFSPROC_STATFS, fhandle, &fsinfo, 0);
|
|
dprintk("NFS reply fsinfo: %d\n", status);
|
|
if (status)
|
|
goto out;
|
|
info->rtmax = NFS_MAXDATA;
|
|
info->rtpref = fsinfo.tsize;
|
|
info->rtmult = fsinfo.bsize;
|
|
info->wtmax = NFS_MAXDATA;
|
|
info->wtpref = fsinfo.tsize;
|
|
info->wtmult = fsinfo.bsize;
|
|
info->dtpref = fsinfo.tsize;
|
|
info->maxfilesize = 0x7FFFFFFF;
|
|
info->lease_time = 0;
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
|
|
struct nfs_pathconf *info)
|
|
{
|
|
info->max_link = 0;
|
|
info->max_namelen = NFS2_MAXNAMLEN;
|
|
return 0;
|
|
}
|
|
|
|
extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
|
|
|
|
static void nfs_read_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_read_data *data = calldata;
|
|
|
|
if (task->tk_status >= 0) {
|
|
nfs_refresh_inode(data->inode, data->res.fattr);
|
|
/* Emulate the eof flag, which isn't normally needed in NFSv2
|
|
* as it is guaranteed to always return the file attributes
|
|
*/
|
|
if (data->args.offset + data->args.count >= data->res.fattr->size)
|
|
data->res.eof = 1;
|
|
}
|
|
nfs_readpage_result(task, calldata);
|
|
}
|
|
|
|
static const struct rpc_call_ops nfs_read_ops = {
|
|
.rpc_call_done = nfs_read_done,
|
|
.rpc_release = nfs_readdata_release,
|
|
};
|
|
|
|
static void
|
|
nfs_proc_read_setup(struct nfs_read_data *data)
|
|
{
|
|
struct rpc_task *task = &data->task;
|
|
struct inode *inode = data->inode;
|
|
int flags;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs_procedures[NFSPROC_READ],
|
|
.rpc_argp = &data->args,
|
|
.rpc_resp = &data->res,
|
|
.rpc_cred = data->cred,
|
|
};
|
|
|
|
/* N.B. Do we need to test? Never called for swapfile inode */
|
|
flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
|
|
|
|
/* Finalize the task. */
|
|
rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs_read_ops, data);
|
|
rpc_call_setup(task, &msg, 0);
|
|
}
|
|
|
|
static void nfs_write_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_write_data *data = calldata;
|
|
|
|
if (task->tk_status >= 0)
|
|
nfs_post_op_update_inode(data->inode, data->res.fattr);
|
|
nfs_writeback_done(task, calldata);
|
|
}
|
|
|
|
static const struct rpc_call_ops nfs_write_ops = {
|
|
.rpc_call_done = nfs_write_done,
|
|
.rpc_release = nfs_writedata_release,
|
|
};
|
|
|
|
static void
|
|
nfs_proc_write_setup(struct nfs_write_data *data, int how)
|
|
{
|
|
struct rpc_task *task = &data->task;
|
|
struct inode *inode = data->inode;
|
|
int flags;
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &nfs_procedures[NFSPROC_WRITE],
|
|
.rpc_argp = &data->args,
|
|
.rpc_resp = &data->res,
|
|
.rpc_cred = data->cred,
|
|
};
|
|
|
|
/* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
|
|
data->args.stable = NFS_FILE_SYNC;
|
|
|
|
/* Set the initial flags for the task. */
|
|
flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
|
|
|
|
/* Finalize the task. */
|
|
rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs_write_ops, data);
|
|
rpc_call_setup(task, &msg, 0);
|
|
}
|
|
|
|
static void
|
|
nfs_proc_commit_setup(struct nfs_write_data *data, int how)
|
|
{
|
|
BUG();
|
|
}
|
|
|
|
static int
|
|
nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
|
|
{
|
|
return nlmclnt_proc(filp->f_dentry->d_inode, cmd, fl);
|
|
}
|
|
|
|
|
|
struct nfs_rpc_ops nfs_v2_clientops = {
|
|
.version = 2, /* protocol version */
|
|
.dentry_ops = &nfs_dentry_operations,
|
|
.dir_inode_ops = &nfs_dir_inode_operations,
|
|
.file_inode_ops = &nfs_file_inode_operations,
|
|
.getroot = nfs_proc_get_root,
|
|
.getattr = nfs_proc_getattr,
|
|
.setattr = nfs_proc_setattr,
|
|
.lookup = nfs_proc_lookup,
|
|
.access = NULL, /* access */
|
|
.readlink = nfs_proc_readlink,
|
|
.read = nfs_proc_read,
|
|
.write = nfs_proc_write,
|
|
.commit = NULL, /* commit */
|
|
.create = nfs_proc_create,
|
|
.remove = nfs_proc_remove,
|
|
.unlink_setup = nfs_proc_unlink_setup,
|
|
.unlink_done = nfs_proc_unlink_done,
|
|
.rename = nfs_proc_rename,
|
|
.link = nfs_proc_link,
|
|
.symlink = nfs_proc_symlink,
|
|
.mkdir = nfs_proc_mkdir,
|
|
.rmdir = nfs_proc_rmdir,
|
|
.readdir = nfs_proc_readdir,
|
|
.mknod = nfs_proc_mknod,
|
|
.statfs = nfs_proc_statfs,
|
|
.fsinfo = nfs_proc_fsinfo,
|
|
.pathconf = nfs_proc_pathconf,
|
|
.decode_dirent = nfs_decode_dirent,
|
|
.read_setup = nfs_proc_read_setup,
|
|
.write_setup = nfs_proc_write_setup,
|
|
.commit_setup = nfs_proc_commit_setup,
|
|
.file_open = nfs_open,
|
|
.file_release = nfs_release,
|
|
.lock = nfs_proc_lock,
|
|
};
|