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/*

 *  linux/fs/nfs/nfs3proc.c

 *

 *  Client-side NFSv3 procedures stubs.

 *

 *  Copyright (C) 1997, Olaf Kirch

 */

#include <linux/mm.h>

#include <linux/utsname.h>

#include <linux/errno.h>

#include <linux/string.h>

#include <linux/sunrpc/clnt.h>

#include <linux/nfs.h>

#include <linux/nfs3.h>

#include <linux/nfs_fs.h>

#define NFSDBG_FACILITY         NFSDBG_PROC

/* A wrapper to handle the EJUKEBOX error message */

static int

nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)

{

        sigset_t oldset;

        int res;

        rpc_clnt_sigmask(clnt, &oldset);

        do {

                res = rpc_call_sync(clnt, msg, flags);

                if (res != -EJUKEBOX)

                        break;

                set_current_state(TASK_INTERRUPTIBLE);

                schedule_timeout(NFS_JUKEBOX_RETRY_TIME);

                res = -ERESTARTSYS;

        } while (!signalled());

        rpc_clnt_sigunmask(clnt, &oldset);

        return res;

}

static inline int

nfs3_rpc_call_wrapper(struct rpc_clnt *clnt, u32 proc, void *argp, void *resp, int flags)

{

        struct rpc_message msg = { proc, argp, resp, NULL };

        return nfs3_rpc_wrapper(clnt, &msg, flags);

}

#define rpc_call(clnt, proc, argp, resp, flags) \

                nfs3_rpc_call_wrapper(clnt, proc, argp, resp, flags)

#define rpc_call_sync(clnt, msg, flags) \

                nfs3_rpc_wrapper(clnt, msg, flags)

/*

 * Bare-bones access to getattr: this is for nfs_read_super.

 */

static int

nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,

                   struct nfs_fattr *fattr)

{

        int     status;

        dprintk("NFS call  getroot\n");

        fattr->valid = 0;

        status = rpc_call(server->client, NFS3PROC_GETATTR, fhandle, fattr, 0);

        dprintk("NFS reply getroot\n");

        return status;

}

/*

 * One function for each procedure in the NFS protocol.

 */

static int

nfs3_proc_getattr(struct inode *inode, struct nfs_fattr *fattr)

{

        int     status;

        dprintk("NFS call  getattr\n");

        fattr->valid = 0;

        status = rpc_call(NFS_CLIENT(inode), NFS3PROC_GETATTR,

                          NFS_FH(inode), fattr, 0);

        dprintk("NFS reply getattr\n");

        return status;

}

static int

nfs3_proc_setattr(struct inode *inode, struct nfs_fattr *fattr,

                        struct iattr *sattr)

{

        struct nfs3_sattrargs   arg = { NFS_FH(inode), sattr, 0, 0 };

        int     status;

        dprintk("NFS call  setattr\n");

        fattr->valid = 0;

        status = rpc_call(NFS_CLIENT(inode), NFS3PROC_SETATTR, &arg, fattr, 0);

        dprintk("NFS reply setattr\n");

        return status;

}

static int

nfs3_proc_lookup(struct inode *dir, struct qstr *name,

                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)

{

        struct nfs_fattr        dir_attr;

        struct nfs3_diropargs   arg = { NFS_FH(dir), name->name, name->len };

        struct nfs3_diropres    res = { &dir_attr, fhandle, fattr };

        int                     status;

        dprintk("NFS call  lookup %s\n", name->name);

        dir_attr.valid = 0;

        fattr->valid = 0;

        status = rpc_call(NFS_CLIENT(dir), NFS3PROC_LOOKUP, &arg, &res, 0);

        if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR))

                status = rpc_call(NFS_CLIENT(dir), NFS3PROC_GETATTR,

                         fhandle, fattr, 0);

        dprintk("NFS reply lookup: %d\n", status);

        if (status >= 0)

                status = nfs_refresh_inode(dir, &dir_attr);

        return status;

}

static int

nfs3_proc_access(struct inode *inode, int mode, int ruid)

{

        struct nfs_fattr        fattr;

        struct nfs3_accessargs  arg = { NFS_FH(inode), 0 };

        struct nfs3_accessres   res = { &fattr, 0 };

        int     status, flags;

        dprintk("NFS call  access\n");

        fattr.valid = 0;

        if (mode & MAY_READ)

                arg.access |= NFS3_ACCESS_READ;

        if (S_ISDIR(inode->i_mode)) {

                if (mode & MAY_WRITE)

                        arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE;

                if (mode & MAY_EXEC)

                        arg.access |= NFS3_ACCESS_LOOKUP;

        } else {

                if (mode & MAY_WRITE)

                        arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND;

                if (mode & MAY_EXEC)

                        arg.access |= NFS3_ACCESS_EXECUTE;

        }

        flags = (ruid) ? RPC_CALL_REALUID : 0;

        status = rpc_call(NFS_CLIENT(inode), NFS3PROC_ACCESS, &arg, &res, flags);

        nfs_refresh_inode(inode, &fattr);

        dprintk("NFS reply access\n");

        if (status == 0 && (arg.access & res.access) != arg.access)

                status = -EACCES;

        return status;

}

static int

nfs3_proc_readlink(struct inode *inode, struct page *page)

{

        struct nfs_fattr        fattr;

        struct nfs3_readlinkargs args = { NFS_FH(inode), PAGE_CACHE_SIZE, &page };

        int                     status;

        dprintk("NFS call  readlink\n");

        fattr.valid = 0;

        status = rpc_call(NFS_CLIENT(inode), NFS3PROC_READLINK,

                        &args, &fattr, 0);

        nfs_refresh_inode(inode, &fattr);

        dprintk("NFS reply readlink: %d\n", status);

        return status;

}

static int

nfs3_proc_read(struct inode *inode, struct rpc_cred *cred,

               struct nfs_fattr *fattr, int flags,

               unsigned int base, unsigned int count, struct page *page,

               int *eofp)

{

        u64                     offset = page_offset(page) + base;

        struct nfs_readargs     arg = { NFS_FH(inode), offset, count,

                                        base, &page };

        struct nfs_readres      res = { fattr, count, 0 };

        struct rpc_message      msg = { NFS3PROC_READ, &arg, &res, cred };

        int                     status;

        dprintk("NFS call  read %d @ %Ld\n", count, (long long)offset);

        fattr->valid = 0;

        status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);

        dprintk("NFS reply read: %d\n", status);

        *eofp = res.eof;

        return status;

}

static int

nfs3_proc_write(struct inode *inode, struct rpc_cred *cred,

                struct nfs_fattr *fattr, int flags,

                unsigned int base, unsigned int count,

                struct page *page, struct nfs_writeverf *verf)

{

        u64                     offset = page_offset(page) + base;

        struct nfs_writeargs    arg = { NFS_FH(inode), offset, count,

                                        NFS_FILE_SYNC, base, &page };

        struct nfs_writeres     res = { fattr, verf, 0 };

        struct rpc_message      msg = { NFS3PROC_WRITE, &arg, &res, cred };

        int                     status, rpcflags = 0;

        dprintk("NFS call  write %d @ %Ld\n", count, (long long)offset);

        fattr->valid = 0;

        if (flags & NFS_RW_SWAP)

                rpcflags |= NFS_RPC_SWAPFLAGS;

        arg.stable = (flags & NFS_RW_SYNC) ? NFS_FILE_SYNC : NFS_UNSTABLE;

        status = rpc_call_sync(NFS_CLIENT(inode), &msg, rpcflags);

        dprintk("NFS reply read: %d\n", status);

        return status < 0? status : res.count;

}

/*

 * Create a regular file.

 * For now, we don't implement O_EXCL.

 */

static int

nfs3_proc_create(struct inode *dir, struct qstr *name, struct iattr *sattr,

                 int flags, struct nfs_fh *fhandle, struct nfs_fattr *fattr)

{

        struct nfs_fattr        dir_attr;

        struct nfs3_createargs  arg = { NFS_FH(dir), name->name, name->len,

                                        sattr, 0, { 0, 0 } };

        struct nfs3_diropres    res = { &dir_attr, fhandle, fattr };

        int                     status;

        dprintk("NFS call  create %s\n", name->name);

        arg.createmode = NFS3_CREATE_UNCHECKED;

        if (flags & O_EXCL) {

                arg.createmode  = NFS3_CREATE_EXCLUSIVE;

                arg.verifier[0] = jiffies;

                arg.verifier[1] = current->pid;

        }

again:

        dir_attr.valid = 0;

        fattr->valid = 0;

        status = rpc_call(NFS_CLIENT(dir), NFS3PROC_CREATE, &arg, &res, 0);

        nfs_refresh_inode(dir, &dir_attr);

        /* If the server doesn't support the exclusive creation semantics,

         * try again with simple 'guarded' mode. */

        if (status == NFSERR_NOTSUPP) {

                switch (arg.createmode) {

                        case NFS3_CREATE_EXCLUSIVE:

                                arg.createmode = NFS3_CREATE_GUARDED;

                                break;

                        case NFS3_CREATE_GUARDED:

                                arg.createmode = NFS3_CREATE_UNCHECKED;

                                break;

                        case NFS3_CREATE_UNCHECKED:

                                goto exit;

                }

                goto again;

        }

exit:

        dprintk("NFS reply create: %d\n", status);

        /* When we created the file with exclusive semantics, make

         * sure we set the attributes afterwards. */

        if (status == 0 && arg.createmode == NFS3_CREATE_EXCLUSIVE) {

                struct nfs3_sattrargs   arg = { fhandle, sattr, 0, 0 };

                dprintk("NFS call  setattr (post-create)\n");

                /* Note: we could use a guarded setattr here, but I'm

                 * not sure this buys us anything (and I'd have

                 * to revamp the NFSv3 XDR code) */

                fattr->valid = 0;

                status = rpc_call(NFS_CLIENT(dir), NFS3PROC_SETATTR,

                                                &arg, fattr, 0);

                dprintk("NFS reply setattr (post-create): %d\n", status);

        }

        return status;

}

static int

nfs3_proc_remove(struct inode *dir, struct qstr *name)

{

        struct nfs_fattr        dir_attr;

        struct nfs3_diropargs   arg = { NFS_FH(dir), name->name, name->len };

        struct rpc_message      msg = { NFS3PROC_REMOVE, &arg, &dir_attr, NULL };

        int                     status;

        dprintk("NFS call  remove %s\n", name->name);

        dir_attr.valid = 0;

        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);

        nfs_refresh_inode(dir, &dir_attr);

        dprintk("NFS reply remove: %d\n", status);

        return status;

}

static int

nfs3_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)

{

        struct nfs3_diropargs   *arg;

        struct nfs_fattr        *res;

        struct unlinkxdr {

                struct nfs3_diropargs arg;

                struct nfs_fattr res;

        } *ptr;

        ptr = (struct unlinkxdr *)kmalloc(sizeof(*ptr), GFP_KERNEL);

        if (!ptr)

                return -ENOMEM;

        arg = &ptr->arg;

        res = &ptr->res;

        arg->fh = NFS_FH(dir->d_inode);

        arg->name = name->name;

        arg->len = name->len;

        res->valid = 0;

        msg->rpc_proc = NFS3PROC_REMOVE;

        msg->rpc_argp = arg;

        msg->rpc_resp = res;

        return 0;

}

static void

nfs3_proc_unlink_done(struct dentry *dir, struct rpc_message *msg)

{

        struct nfs_fattr        *dir_attr;

        if (msg->rpc_argp) {

                dir_attr = (struct nfs_fattr*)msg->rpc_resp;

                nfs_refresh_inode(dir->d_inode, dir_attr);

                kfree(msg->rpc_argp);

        }

}

static int

nfs3_proc_rename(struct inode *old_dir, struct qstr *old_name,

                 struct inode *new_dir, struct qstr *new_name)

{

        struct nfs_fattr        old_dir_attr, new_dir_attr;

        struct nfs3_renameargs  arg = { NFS_FH(old_dir),

                                        old_name->name, old_name->len,

                                        NFS_FH(new_dir),

                                        new_name->name, new_name->len };

        struct nfs3_renameres   res = { &old_dir_attr, &new_dir_attr };

        int                     status;

        dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);

        old_dir_attr.valid = 0;

        new_dir_attr.valid = 0;

        status = rpc_call(NFS_CLIENT(old_dir), NFS3PROC_RENAME, &arg, &res, 0);

        nfs_refresh_inode(old_dir, &old_dir_attr);

        nfs_refresh_inode(new_dir, &new_dir_attr);

        dprintk("NFS reply rename: %d\n", status);

        return status;

}

static int

nfs3_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)

{

        struct nfs_fattr        dir_attr, fattr;

        struct nfs3_linkargs    arg = { NFS_FH(inode), NFS_FH(dir),

                                        name->name, name->len };

        struct nfs3_linkres     res = { &dir_attr, &fattr };

        int                     status;

        dprintk("NFS call  link %s\n", name->name);

        dir_attr.valid = 0;

        fattr.valid = 0;

        status = rpc_call(NFS_CLIENT(inode), NFS3PROC_LINK, &arg, &res, 0);

        nfs_refresh_inode(dir, &dir_attr);

        nfs_refresh_inode(inode, &fattr);

        dprintk("NFS reply link: %d\n", status);

        return status;

}

static int

nfs3_proc_symlink(struct inode *dir, struct qstr *name, struct qstr *path,

                  struct iattr *sattr, struct nfs_fh *fhandle,

                  struct nfs_fattr *fattr)

{

        struct nfs_fattr        dir_attr;

        struct nfs3_symlinkargs arg = { NFS_FH(dir), name->name, name->len,

                                        path->name, path->len, sattr };

        struct nfs3_diropres    res = { &dir_attr, fhandle, fattr };

        int                     status;

        dprintk("NFS call  symlink %s -> %s\n", name->name, path->name);

        dir_attr.valid = 0;

        fattr->valid = 0;

        status = rpc_call(NFS_CLIENT(dir), NFS3PROC_SYMLINK, &arg, &res, 0);

        nfs_refresh_inode(dir, &dir_attr);

        dprintk("NFS reply symlink: %d\n", status);

        return status;

}

static int

nfs3_proc_mkdir(struct inode *dir, struct qstr *name, struct iattr *sattr,

                struct nfs_fh *fhandle, struct nfs_fattr *fattr)

{

        struct nfs_fattr        dir_attr;

        struct nfs3_mkdirargs   arg = { NFS_FH(dir), name->name, name->len,

                                        sattr };

        struct nfs3_diropres    res = { &dir_attr, fhandle, fattr };

        int                     status;

        dprintk("NFS call  mkdir %s\n", name->name);

        dir_attr.valid = 0;

        fattr->valid = 0;

        status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKDIR, &arg, &res, 0);

        nfs_refresh_inode(dir, &dir_attr);

        dprintk("NFS reply mkdir: %d\n", status);

        return status;

}

static int

nfs3_proc_rmdir(struct inode *dir, struct qstr *name)

{

        struct nfs_fattr        dir_attr;

        struct nfs3_diropargs   arg = { NFS_FH(dir), name->name, name->len };

        int                     status;

        dprintk("NFS call  rmdir %s\n", name->name);

        dir_attr.valid = 0;

        status = rpc_call(NFS_CLIENT(dir), NFS3PROC_RMDIR, &arg, &dir_attr, 0);

        nfs_refresh_inode(dir, &dir_attr);

        dprintk("NFS reply rmdir: %d\n", status);

        return status;

}

/*

 * The READDIR implementation is somewhat hackish - we pass the user buffer

 * to the encode function, which installs it in the receive iovec.

 * The decode function itself doesn't perform any decoding, it just makes

 * sure the reply is syntactically correct.

 *

 */

static int

nfs3_proc_readdir(struct inode *dir, struct rpc_cred *cred,

                  u64 cookie, struct page *page, unsigned int count, int plus)

{

        struct nfs_fattr        dir_attr;

        u32                     *verf = NFS_COOKIEVERF(dir);

        struct nfs3_readdirargs arg = { NFS_FH(dir), cookie, {verf[0], verf[1]},

                                        plus, count, &page };

        struct nfs3_readdirres  res = { &dir_attr, verf, plus };

        struct rpc_message      msg = { NFS3PROC_READDIR, &arg, &res, cred };

        int                     status;

        dprintk("NFS call  readdir %d\n", (unsigned int) cookie);

        dir_attr.valid = 0;

        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);

        nfs_refresh_inode(dir, &dir_attr);

        dprintk("NFS reply readdir: %d\n", status);

        return status;

}

static int

nfs3_proc_mknod(struct inode *dir, struct qstr *name, struct iattr *sattr,

                dev_t rdev, struct nfs_fh *fh, struct nfs_fattr *fattr)

{

        struct nfs_fattr        dir_attr;

        struct nfs3_mknodargs   arg = { NFS_FH(dir), name->name, name->len, 0,

                                        sattr, rdev };

        struct nfs3_diropres    res = { &dir_attr, fh, fattr };

        int                     status;

        switch (sattr->ia_mode & S_IFMT) {

        case S_IFBLK:   arg.type = NF3BLK;  break;

        case S_IFCHR:   arg.type = NF3CHR;  break;

        case S_IFIFO:   arg.type = NF3FIFO; break;

        case S_IFSOCK:  arg.type = NF3SOCK; break;

        default:        return -EINVAL;

        }

        dprintk("NFS call  mknod %s %x\n", name->name, rdev);

        dir_attr.valid = 0;

        fattr->valid = 0;

        status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKNOD, &arg, &res, 0);

        nfs_refresh_inode(dir, &dir_attr);

        dprintk("NFS reply mknod: %d\n", status);

        return status;

}

/*

 * This is a combo call of fsstat and fsinfo

 */

static int

nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,

                 struct nfs_fsinfo *info)

{

        int     status;

        dprintk("NFS call  fsstat\n");

        memset((char *)info, 0, sizeof(*info));

        status = rpc_call(server->client, NFS3PROC_FSSTAT, fhandle, info, 0);

        if (status < 0)

                goto error;

        status = rpc_call(server->client, NFS3PROC_FSINFO, fhandle, info, 0);

error:

        dprintk("NFS reply statfs: %d\n", status);

        return status;

}

extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int);

struct nfs_rpc_ops      nfs_v3_clientops = {

        3,                      /* protocol version */

        nfs3_proc_get_root,

        nfs3_proc_getattr,

        nfs3_proc_setattr,

        nfs3_proc_lookup,

        nfs3_proc_access,

        nfs3_proc_readlink,

        nfs3_proc_read,

        nfs3_proc_write,

        NULL,                   /* commit */

        nfs3_proc_create,

        nfs3_proc_remove,

        nfs3_proc_unlink_setup,

        nfs3_proc_unlink_done,

        nfs3_proc_rename,

        nfs3_proc_link,

        nfs3_proc_symlink,

        nfs3_proc_mkdir,

        nfs3_proc_rmdir,

        nfs3_proc_readdir,

        nfs3_proc_mknod,

        nfs3_proc_statfs,

        nfs3_decode_dirent,

};