Exemplo n.º 1
0
static void
nfs4_setup_readdir(struct nfs4_compound *cp, u64 cookie, u32 *verifier,
		     struct page **pages, unsigned int bufsize, struct dentry *dentry)
{
	u32 *start, *p;
	struct nfs4_readdir *readdir = GET_OP(cp, readdir);

	BUG_ON(bufsize < 80);
	readdir->rd_cookie = (cookie > 2) ? cookie : 0;
	memcpy(&readdir->rd_req_verifier, verifier, sizeof(readdir->rd_req_verifier));
	readdir->rd_count = bufsize;
	readdir->rd_bmval[0] = FATTR4_WORD0_FILEID;
	readdir->rd_bmval[1] = 0;
	readdir->rd_pages = pages;
	readdir->rd_pgbase = 0;
	
	OPNUM(cp) = OP_READDIR;
	cp->req_nops++;

	if (cookie >= 2)
		return;
	
	/*
	 * NFSv4 servers do not return entries for '.' and '..'
	 * Therefore, we fake these entries here.  We let '.'
	 * have cookie 0 and '..' have cookie 1.  Note that
	 * when talking to the server, we always send cookie 0
	 * instead of 1 or 2.
	 */
	start = p = (u32 *)kmap_atomic(*pages, KM_USER0);
	
	if (cookie == 0) {
		*p++ = xdr_one;                                  /* next */
		*p++ = xdr_zero;                   /* cookie, first word */
		*p++ = xdr_one;                   /* cookie, second word */
		*p++ = xdr_one;                             /* entry len */
		memcpy(p, ".\0\0\0", 4);                        /* entry */
		p++;
		*p++ = xdr_one;                         /* bitmap length */
		*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
		*p++ = htonl(8);              /* attribute buffer length */
		p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
	}
	
	*p++ = xdr_one;                                  /* next */
	*p++ = xdr_zero;                   /* cookie, first word */
	*p++ = xdr_two;                   /* cookie, second word */
	*p++ = xdr_two;                             /* entry len */
	memcpy(p, "..\0\0", 4);                         /* entry */
	p++;
	*p++ = xdr_one;                         /* bitmap length */
	*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
	*p++ = htonl(8);              /* attribute buffer length */
	p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));

	readdir->rd_pgbase = (char *)p - (char *)start;
	readdir->rd_count -= readdir->rd_pgbase;
	kunmap_atomic(start, KM_USER0);
}
Exemplo n.º 2
0
/*
 * Handle a write reply that flushed part of a page.
 */
static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
{
	struct nfs_write_data	*data = calldata;

	dprintk("NFS: %5u write(%s/%lld %d@%lld)",
		task->tk_pid,
		data->req->wb_context->path.dentry->d_inode->i_sb->s_id,
		(long long)
		  NFS_FILEID(data->req->wb_context->path.dentry->d_inode),
		data->req->wb_bytes, (long long)req_offset(data->req));

	nfs_writeback_done(task, data);
}
/*
 * In NFSv3 we can have 64bit inode numbers. In order to support
 * this, and re-exported directories (also seen in NFSv2)
 * we are forced to allow 2 different inodes to have the same
 * i_ino.
 */
static int
nfs_find_actor(struct inode *inode, void *opaque)
{
	struct nfs_find_desc	*desc = (struct nfs_find_desc *)opaque;
	struct nfs_fh		*fh = desc->fh;
	struct nfs_fattr	*fattr = desc->fattr;

	if (NFS_FILEID(inode) != fattr->fileid)
		return 0;
	if (nfs_compare_fh(NFS_FH(inode), fh))
		return 0;
	if (is_bad_inode(inode) || NFS_STALE(inode))
		return 0;
	return 1;
}
Exemplo n.º 4
0
static void nfs_writeback_release_full(void *calldata)
{
	struct nfs_write_data	*data = calldata;
	int status = data->task.tk_status;

	/* Update attributes as result of writeback. */
	while (!list_empty(&data->pages)) {
		struct nfs_page *req = nfs_list_entry(data->pages.next);
		struct page *page = req->wb_page;

		nfs_list_remove_request(req);

		dprintk("NFS: %5u write (%s/%lld %d@%lld)",
			data->task.tk_pid,
			req->wb_context->path.dentry->d_inode->i_sb->s_id,
			(long long)NFS_FILEID(req->wb_context->path.dentry->d_inode),
			req->wb_bytes,
			(long long)req_offset(req));

		if (status < 0) {
			nfs_set_pageerror(page);
			nfs_context_set_write_error(req->wb_context, status);
			dprintk(", error = %d\n", status);
			goto remove_request;
		}

		if (nfs_write_need_commit(data)) {
			memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
			nfs_mark_request_commit(req);
			nfs_end_page_writeback(page);
			dprintk(" marked for commit\n");
			goto next;
		}
		dprintk(" OK\n");
remove_request:
		nfs_end_page_writeback(page);
		nfs_inode_remove_request(req);
	next:
		nfs_clear_page_tag_locked(req);
	}
	nfs_writedata_release(calldata);
}
Exemplo n.º 5
0
/*
 * The "read_inode" function doesn't actually do anything:
 * the real data is filled in later in nfs_fhget. Here we
 * just mark the cache times invalid, and zero out i_mode
 * (the latter makes "nfs_refresh_inode" do the right thing
 * wrt pipe inodes)
 */
static void
nfs_read_inode(struct inode * inode)
{
	inode->i_blksize = inode->i_sb->s_blocksize;
	inode->i_mode = 0;
	inode->i_rdev = 0;
	NFS_FILEID(inode) = 0;
	NFS_FSID(inode) = 0;
	INIT_LIST_HEAD(&inode->u.nfs_i.read);
	INIT_LIST_HEAD(&inode->u.nfs_i.dirty);
	INIT_LIST_HEAD(&inode->u.nfs_i.commit);
	INIT_LIST_HEAD(&inode->u.nfs_i.writeback);
	inode->u.nfs_i.nread = 0;
	inode->u.nfs_i.ndirty = 0;
	inode->u.nfs_i.ncommit = 0;
	inode->u.nfs_i.npages = 0;
	NFS_CACHEINV(inode);
	NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
	NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
}
Exemplo n.º 6
0
Arquivo: inode.c Projeto: nhanh0/hah
/*
 * The "read_inode" function doesn't actually do anything:
 * the real data is filled in later in nfs_fhget. Here we
 * just mark the cache times invalid, and zero out i_mode
 * (the latter makes "nfs_refresh_inode" do the right thing
 * wrt pipe inodes)
 */
static void
nfs_read_inode(struct inode * inode)
{
	inode->i_blksize = inode->i_sb->s_blocksize;
	inode->i_mode = 0;
	inode->i_rdev = 0;
	/* We can't support UPDATE_ATIME(), since the server will reset it */
	inode->i_flags |= S_NOATIME;
	NFS_FILEID(inode) = 0;
	NFS_FSID(inode) = 0;
	NFS_FLAGS(inode) = 0;
	INIT_LIST_HEAD(&inode->u.nfs_i.read);
	INIT_LIST_HEAD(&inode->u.nfs_i.dirty);
	INIT_LIST_HEAD(&inode->u.nfs_i.commit);
	INIT_LIST_HEAD(&inode->u.nfs_i.writeback);
	inode->u.nfs_i.nread = 0;
	inode->u.nfs_i.ndirty = 0;
	inode->u.nfs_i.ncommit = 0;
	inode->u.nfs_i.npages = 0;
	NFS_CACHEINV(inode);
	NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
	NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
}
Exemplo n.º 7
0
/**
 * nfs_sillyrename - Perform a silly-rename of a dentry
 * @dir: inode of directory that contains dentry
 * @dentry: dentry to be sillyrenamed
 *
 * NFSv2/3 is stateless and the server doesn't know when the client is
 * holding a file open. To prevent application problems when a file is
 * unlinked while it's still open, the client performs a "silly-rename".
 * That is, it renames the file to a hidden file in the same directory,
 * and only performs the unlink once the last reference to it is put.
 *
 * The final cleanup is done during dentry_iput.
 *
 * (Note: NFSv4 is stateful, and has opens, so in theory an NFSv4 server
 * could take responsibility for keeping open files referenced.  The server
 * would also need to ensure that opened-but-deleted files were kept over
 * reboots.  However, we may not assume a server does so.  (RFC 5661
 * does provide an OPEN4_RESULT_PRESERVE_UNLINKED flag that a server can
 * use to advertise that it does this; some day we may take advantage of
 * it.))
 */
int
nfs_sillyrename(struct inode *dir, struct dentry *dentry)
{
    static unsigned int sillycounter;
    const int      fileidsize  = sizeof(NFS_FILEID(dentry->d_inode))*2;
    const int      countersize = sizeof(sillycounter)*2;
    const int      slen        = sizeof(".nfs")+fileidsize+countersize-1;
    char           silly[slen+1];
    struct dentry *sdentry;
    struct rpc_task *task;
    int            error = -EIO;

    dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n",
             dentry->d_parent->d_name.name, dentry->d_name.name,
             dentry->d_count);
    nfs_inc_stats(dir, NFSIOS_SILLYRENAME);

    /*
     * We don't allow a dentry to be silly-renamed twice.
     */
    error = -EBUSY;
    if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
        goto out;

    sprintf(silly, ".nfs%*.*Lx",
            fileidsize, fileidsize,
            (unsigned long long)NFS_FILEID(dentry->d_inode));

    /* Return delegation in anticipation of the rename */
    NFS_PROTO(dentry->d_inode)->return_delegation(dentry->d_inode);

    sdentry = NULL;
    do {
        char *suffix = silly + slen - countersize;

        dput(sdentry);
        sillycounter++;
        sprintf(suffix, "%*.*x", countersize, countersize, sillycounter);

        dfprintk(VFS, "NFS: trying to rename %s to %s\n",
                 dentry->d_name.name, silly);

        sdentry = lookup_one_len(silly, dentry->d_parent, slen);
        /*
         * N.B. Better to return EBUSY here ... it could be
         * dangerous to delete the file while it's in use.
         */
        if (IS_ERR(sdentry))
            goto out;
    } while (sdentry->d_inode != NULL); /* need negative lookup */

    /* queue unlink first. Can't do this from rpc_release as it
     * has to allocate memory
     */
    error = nfs_async_unlink(dir, dentry);
    if (error)
        goto out_dput;

    /* populate unlinkdata with the right dname */
    error = nfs_copy_dname(sdentry,
                           (struct nfs_unlinkdata *)dentry->d_fsdata);
    if (error) {
        nfs_cancel_async_unlink(dentry);
        goto out_dput;
    }

    /* run the rename task, undo unlink if it fails */
    task = nfs_async_rename(dir, dir, dentry, sdentry);
    if (IS_ERR(task)) {
        error = -EBUSY;
        nfs_cancel_async_unlink(dentry);
        goto out_dput;
    }

    /* wait for the RPC task to complete, unless a SIGKILL intervenes */
    error = rpc_wait_for_completion_task(task);
    if (error == 0)
        error = task->tk_status;
    switch (error) {
    case 0:
        /* The rename succeeded */
        nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
        d_move(dentry, sdentry);
        break;
    case -ERESTARTSYS:
        /* The result of the rename is unknown. Play it safe by
         * forcing a new lookup */
        d_drop(dentry);
        d_drop(sdentry);
    }
    rpc_put_task(task);
out_dput:
    dput(sdentry);
out:
    return error;
}
Exemplo n.º 8
0
/*
 * Set up the argument/result storage required for the RPC call.
 */
static int nfs_write_rpcsetup(struct nfs_page *req,
		struct nfs_write_data *data,
		const struct rpc_call_ops *call_ops,
		unsigned int count, unsigned int offset,
		int how)
{
	struct inode *inode = req->wb_context->path.dentry->d_inode;
	int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
	int priority = flush_task_priority(how);
	struct rpc_task *task;
	struct rpc_message msg = {
		.rpc_argp = &data->args,
		.rpc_resp = &data->res,
		.rpc_cred = req->wb_context->cred,
	};
	struct rpc_task_setup task_setup_data = {
		.rpc_client = NFS_CLIENT(inode),
		.task = &data->task,
		.rpc_message = &msg,
		.callback_ops = call_ops,
		.callback_data = data,
		.workqueue = nfsiod_workqueue,
		.flags = flags,
		.priority = priority,
	};

	/* Set up the RPC argument and reply structs
	 * NB: take care not to mess about with data->commit et al. */

	data->req = req;
	data->inode = inode = req->wb_context->path.dentry->d_inode;
	data->cred = msg.rpc_cred;

	data->args.fh     = NFS_FH(inode);
	data->args.offset = req_offset(req) + offset;
	data->args.pgbase = req->wb_pgbase + offset;
	data->args.pages  = data->pagevec;
	data->args.count  = count;
	data->args.context = get_nfs_open_context(req->wb_context);
	data->args.stable  = NFS_UNSTABLE;
	if (how & FLUSH_STABLE) {
		data->args.stable = NFS_DATA_SYNC;
		if (!nfs_need_commit(NFS_I(inode)))
			data->args.stable = NFS_FILE_SYNC;
	}

	data->res.fattr   = &data->fattr;
	data->res.count   = count;
	data->res.verf    = &data->verf;
	nfs_fattr_init(&data->fattr);

	/* Set up the initial task struct.  */
	NFS_PROTO(inode)->write_setup(data, &msg);

	dprintk("NFS: %5u initiated write call "
		"(req %s/%lld, %u bytes @ offset %llu)\n",
		data->task.tk_pid,
		inode->i_sb->s_id,
		(long long)NFS_FILEID(inode),
		count,
		(unsigned long long)data->args.offset);

	task = rpc_run_task(&task_setup_data);
	if (IS_ERR(task))
		return PTR_ERR(task);
	rpc_put_task(task);
	return 0;
}

/* If a nfs_flush_* function fails, it should remove reqs from @head and
 * call this on each, which will prepare them to be retried on next
 * writeback using standard nfs.
 */
static void nfs_redirty_request(struct nfs_page *req)
{
	nfs_mark_request_dirty(req);
	nfs_end_page_writeback(req->wb_page);
	nfs_clear_page_tag_locked(req);
}

/*
 * Generate multiple small requests to write out a single
 * contiguous dirty area on one page.
 */
static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how)
{
	struct nfs_page *req = nfs_list_entry(head->next);
	struct page *page = req->wb_page;
	struct nfs_write_data *data;
	size_t wsize = NFS_SERVER(inode)->wsize, nbytes;
	unsigned int offset;
	int requests = 0;
	int ret = 0;
	LIST_HEAD(list);

	nfs_list_remove_request(req);

	nbytes = count;
	do {
		size_t len = min(nbytes, wsize);

		data = nfs_writedata_alloc(1);
		if (!data)
			goto out_bad;
		list_add(&data->pages, &list);
		requests++;
		nbytes -= len;
	} while (nbytes != 0);
	atomic_set(&req->wb_complete, requests);

	ClearPageError(page);
	offset = 0;
	nbytes = count;
	do {
		int ret2;

		data = list_entry(list.next, struct nfs_write_data, pages);
		list_del_init(&data->pages);

		data->pagevec[0] = page;

		if (nbytes < wsize)
			wsize = nbytes;
		ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops,
				   wsize, offset, how);
		if (ret == 0)
			ret = ret2;
		offset += wsize;
		nbytes -= wsize;
	} while (nbytes != 0);

	return ret;

out_bad:
	while (!list_empty(&list)) {
		data = list_entry(list.next, struct nfs_write_data, pages);
		list_del(&data->pages);
		nfs_writedata_release(data);
	}
	nfs_redirty_request(req);
	return -ENOMEM;
}

/*
 * Create an RPC task for the given write request and kick it.
 * The page must have been locked by the caller.
 *
 * It may happen that the page we're passed is not marked dirty.
 * This is the case if nfs_updatepage detects a conflicting request
 * that has been written but not committed.
 */
static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how)
{
	struct nfs_page		*req;
	struct page		**pages;
	struct nfs_write_data	*data;

	data = nfs_writedata_alloc(npages);
	if (!data)
		goto out_bad;

	pages = data->pagevec;
	while (!list_empty(head)) {
		req = nfs_list_entry(head->next);
		nfs_list_remove_request(req);
		nfs_list_add_request(req, &data->pages);
		ClearPageError(req->wb_page);
		*pages++ = req->wb_page;
	}
	req = nfs_list_entry(data->pages.next);

	/* Set up the argument struct */
	return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how);
 out_bad:
	while (!list_empty(head)) {
		req = nfs_list_entry(head->next);
		nfs_list_remove_request(req);
		nfs_redirty_request(req);
	}
	return -ENOMEM;
}

static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
				  struct inode *inode, int ioflags)
{
	size_t wsize = NFS_SERVER(inode)->wsize;

	if (wsize < PAGE_CACHE_SIZE)
		nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags);
	else
		nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags);
}
Exemplo n.º 9
0
/*
 * Set up the argument/result storage required for the RPC call.
 */
static int nfs_commit_rpcsetup(struct list_head *head,
		struct nfs_write_data *data,
		int how)
{
	struct nfs_page *first = nfs_list_entry(head->next);
	struct inode *inode = first->wb_context->path.dentry->d_inode;
	int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
	int priority = flush_task_priority(how);
	struct rpc_task *task;
	struct rpc_message msg = {
		.rpc_argp = &data->args,
		.rpc_resp = &data->res,
		.rpc_cred = first->wb_context->cred,
	};
	struct rpc_task_setup task_setup_data = {
		.task = &data->task,
		.rpc_client = NFS_CLIENT(inode),
		.rpc_message = &msg,
		.callback_ops = &nfs_commit_ops,
		.callback_data = data,
		.workqueue = nfsiod_workqueue,
		.flags = flags,
		.priority = priority,
	};

	/* Set up the RPC argument and reply structs
	 * NB: take care not to mess about with data->commit et al. */

	list_splice_init(head, &data->pages);

	data->inode	  = inode;
	data->cred	  = msg.rpc_cred;

	data->args.fh     = NFS_FH(data->inode);
	/* Note: we always request a commit of the entire inode */
	data->args.offset = 0;
	data->args.count  = 0;
	data->args.context = get_nfs_open_context(first->wb_context);
	data->res.count   = 0;
	data->res.fattr   = &data->fattr;
	data->res.verf    = &data->verf;
	nfs_fattr_init(&data->fattr);

	/* Set up the initial task struct.  */
	NFS_PROTO(inode)->commit_setup(data, &msg);

	dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);

	task = rpc_run_task(&task_setup_data);
	if (IS_ERR(task))
		return PTR_ERR(task);
	rpc_put_task(task);
	return 0;
}

/*
 * Commit dirty pages
 */
static int
nfs_commit_list(struct inode *inode, struct list_head *head, int how)
{
	struct nfs_write_data	*data;
	struct nfs_page         *req;

	data = nfs_commitdata_alloc();

	if (!data)
		goto out_bad;

	/* Set up the argument struct */
	return nfs_commit_rpcsetup(head, data, how);
 out_bad:
	while (!list_empty(head)) {
		req = nfs_list_entry(head->next);
		nfs_list_remove_request(req);
		nfs_mark_request_commit(req);
		dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
		dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
				BDI_RECLAIMABLE);
		nfs_clear_page_tag_locked(req);
	}
	return -ENOMEM;
}

/*
 * COMMIT call returned
 */
static void nfs_commit_done(struct rpc_task *task, void *calldata)
{
	struct nfs_write_data	*data = calldata;

        dprintk("NFS: %5u nfs_commit_done (status %d)\n",
                                task->tk_pid, task->tk_status);

	/* Call the NFS version-specific code */
	if (NFS_PROTO(data->inode)->commit_done(task, data) != 0)
		return;
}

static void nfs_commit_release(void *calldata)
{
	struct nfs_write_data	*data = calldata;
	struct nfs_page		*req;
	int status = data->task.tk_status;

	while (!list_empty(&data->pages)) {
		req = nfs_list_entry(data->pages.next);
		nfs_list_remove_request(req);
		nfs_clear_request_commit(req);

		dprintk("NFS:       commit (%s/%lld %d@%lld)",
			req->wb_context->path.dentry->d_inode->i_sb->s_id,
			(long long)NFS_FILEID(req->wb_context->path.dentry->d_inode),
			req->wb_bytes,
			(long long)req_offset(req));
		if (status < 0) {
			nfs_context_set_write_error(req->wb_context, status);
			nfs_inode_remove_request(req);
			dprintk(", error = %d\n", status);
			goto next;
		}

		/* Okay, COMMIT succeeded, apparently. Check the verifier
		 * returned by the server against all stored verfs. */
		if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) {
			/* We have a match */
			nfs_inode_remove_request(req);
			dprintk(" OK\n");
			goto next;
		}
		/* We have a mismatch. Write the page again */
		dprintk(" mismatch\n");
		nfs_mark_request_dirty(req);
	next:
		nfs_clear_page_tag_locked(req);
	}
	nfs_commitdata_release(calldata);
}

static const struct rpc_call_ops nfs_commit_ops = {
#if defined(CONFIG_NFS_V4_1)
	.rpc_call_prepare = nfs_write_prepare,
#endif /* CONFIG_NFS_V4_1 */
	.rpc_call_done = nfs_commit_done,
	.rpc_release = nfs_commit_release,
};

int nfs_commit_inode(struct inode *inode, int how)
{
	LIST_HEAD(head);
	int res;

	spin_lock(&inode->i_lock);
	res = nfs_scan_commit(inode, &head, 0, 0);
	spin_unlock(&inode->i_lock);
	if (res) {
		int error = nfs_commit_list(inode, &head, how);
		if (error < 0)
			return error;
	}
	return res;
}
#else
static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how)
{
	return 0;
}
#endif

long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how)
{
	struct inode *inode = mapping->host;
	pgoff_t idx_start, idx_end;
	unsigned int npages = 0;
	LIST_HEAD(head);
	int nocommit = how & FLUSH_NOCOMMIT;
	long pages, ret;

	/* FIXME */
	if (wbc->range_cyclic)
		idx_start = 0;
	else {
		idx_start = wbc->range_start >> PAGE_CACHE_SHIFT;
		idx_end = wbc->range_end >> PAGE_CACHE_SHIFT;
		if (idx_end > idx_start) {
			pgoff_t l_npages = 1 + idx_end - idx_start;
			npages = l_npages;
			if (sizeof(npages) != sizeof(l_npages) &&
					(pgoff_t)npages != l_npages)
				npages = 0;
		}
	}
	how &= ~FLUSH_NOCOMMIT;
	spin_lock(&inode->i_lock);
	do {
		ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
		if (ret != 0)
			continue;
		if (nocommit)
			break;
		pages = nfs_scan_commit(inode, &head, idx_start, npages);
		if (pages == 0)
			break;
		if (how & FLUSH_INVALIDATE) {
			spin_unlock(&inode->i_lock);
			nfs_cancel_commit_list(&head);
			ret = pages;
			spin_lock(&inode->i_lock);
			continue;
		}
		pages += nfs_scan_commit(inode, &head, 0, 0);
		spin_unlock(&inode->i_lock);
		ret = nfs_commit_list(inode, &head, how);
		spin_lock(&inode->i_lock);

	} while (ret >= 0);
	spin_unlock(&inode->i_lock);
	return ret;
}

static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
{
	int ret;

	ret = nfs_writepages(mapping, wbc);
	if (ret < 0)
		goto out;
	ret = nfs_sync_mapping_wait(mapping, wbc, how);
	if (ret < 0)
		goto out;
	return 0;
out:
	__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
	return ret;
}
Exemplo n.º 10
0
/*
 * Write a page synchronously.
 * Offset is the data offset within the page.
 */
static int
nfs_writepage_sync(struct file *file, struct inode *inode, struct page *page,
		   unsigned int offset, unsigned int count)
{
	struct rpc_cred	*cred = NULL;
	loff_t		base;
	unsigned int	wsize = NFS_SERVER(inode)->wsize;
	int		result, refresh = 0, written = 0, flags;
	u8		*buffer;
	struct nfs_fattr fattr;
	struct nfs_writeverf verf;


	if (file)
		cred = get_rpccred(nfs_file_cred(file));
	if (!cred)
		cred = get_rpccred(NFS_I(inode)->mm_cred);

	dprintk("NFS:      nfs_writepage_sync(%x/%Ld %d@%Ld)\n",
		inode->i_dev, (long long)NFS_FILEID(inode),
		count, (long long)(page_offset(page) + offset));

	buffer = kmap(page) + offset;
	base = page_offset(page) + offset;

	flags = ((IS_SWAPFILE(inode)) ? NFS_RW_SWAP : 0) | NFS_RW_SYNC;

	do {
		if (count < wsize && !IS_SWAPFILE(inode))
			wsize = count;

		result = NFS_PROTO(inode)->write(inode, cred, &fattr, flags,
						 base, wsize, buffer, &verf);
		nfs_write_attributes(inode, &fattr);

		if (result < 0) {
			/* Must mark the page invalid after I/O error */
			ClearPageUptodate(page);
			goto io_error;
		}
		if (result != wsize)
			printk("NFS: short write, wsize=%u, result=%d\n",
			wsize, result);
		refresh = 1;
		buffer  += wsize;
	        base    += wsize;
		written += wsize;
		count   -= wsize;
		/*
		 * If we've extended the file, update the inode
		 * now so we don't invalidate the cache.
		 */
		if (base > inode->i_size)
			inode->i_size = base;
	} while (count);

	if (PageError(page))
		ClearPageError(page);

io_error:
	kunmap(page);
	if (cred)
		put_rpccred(cred);

	return written? written : result;
}
Exemplo n.º 11
0
int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
		      const struct rpc_call_ops *call_ops, int how, int flags)
{
	struct rpc_task *task;
	struct rpc_message msg = {
		.rpc_argp = &hdr->args,
		.rpc_resp = &hdr->res,
		.rpc_cred = hdr->cred,
	};
	struct rpc_task_setup task_setup_data = {
		.rpc_client = clnt,
		.task = &hdr->task,
		.rpc_message = &msg,
		.callback_ops = call_ops,
		.callback_data = hdr,
		.workqueue = nfsiod_workqueue,
		.flags = RPC_TASK_ASYNC | flags,
	};
	int ret = 0;

	hdr->rw_ops->rw_initiate(hdr, &msg, &task_setup_data, how);

	dprintk("NFS: %5u initiated pgio call "
		"(req %s/%llu, %u bytes @ offset %llu)\n",
		hdr->task.tk_pid,
		hdr->inode->i_sb->s_id,
		(unsigned long long)NFS_FILEID(hdr->inode),
		hdr->args.count,
		(unsigned long long)hdr->args.offset);

	task = rpc_run_task(&task_setup_data);
	if (IS_ERR(task)) {
		ret = PTR_ERR(task);
		goto out;
	}
	if (how & FLUSH_SYNC) {
		ret = rpc_wait_for_completion_task(task);
		if (ret == 0)
			ret = task->tk_status;
	}
	rpc_put_task(task);
out:
	return ret;
}
EXPORT_SYMBOL_GPL(nfs_initiate_pgio);

/**
 * nfs_pgio_error - Clean up from a pageio error
 * @desc: IO descriptor
 * @hdr: pageio header
 */
static int nfs_pgio_error(struct nfs_pageio_descriptor *desc,
			  struct nfs_pgio_header *hdr)
{
	set_bit(NFS_IOHDR_REDO, &hdr->flags);
	nfs_pgio_data_destroy(hdr);
	hdr->completion_ops->completion(hdr);
	desc->pg_completion_ops->error_cleanup(&desc->pg_list);
	return -ENOMEM;
}

/**
 * nfs_pgio_release - Release pageio data
 * @calldata: The pageio header to release
 */
static void nfs_pgio_release(void *calldata)
{
	struct nfs_pgio_header *hdr = calldata;
	if (hdr->rw_ops->rw_release)
		hdr->rw_ops->rw_release(hdr);
	nfs_pgio_data_destroy(hdr);
	hdr->completion_ops->completion(hdr);
}

/**
 * nfs_pageio_init - initialise a page io descriptor
 * @desc: pointer to descriptor
 * @inode: pointer to inode
 * @doio: pointer to io function
 * @bsize: io block size
 * @io_flags: extra parameters for the io function
 */
void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
		     struct inode *inode,
		     const struct nfs_pageio_ops *pg_ops,
		     const struct nfs_pgio_completion_ops *compl_ops,
		     const struct nfs_rw_ops *rw_ops,
		     size_t bsize,
		     int io_flags)
{
	INIT_LIST_HEAD(&desc->pg_list);
	desc->pg_bytes_written = 0;
	desc->pg_count = 0;
	desc->pg_bsize = bsize;
	desc->pg_base = 0;
	desc->pg_moreio = 0;
	desc->pg_recoalesce = 0;
	desc->pg_inode = inode;
	desc->pg_ops = pg_ops;
	desc->pg_completion_ops = compl_ops;
	desc->pg_rw_ops = rw_ops;
	desc->pg_ioflags = io_flags;
	desc->pg_error = 0;
	desc->pg_lseg = NULL;
	desc->pg_dreq = NULL;
	desc->pg_layout_private = NULL;
}
Exemplo n.º 12
0
int
nfs_sillyrename(struct inode *dir, struct dentry *dentry)
{
	static unsigned int sillycounter;
	const int      fileidsize  = sizeof(NFS_FILEID(dentry->d_inode))*2;
	const int      countersize = sizeof(sillycounter)*2;
	const int      slen        = sizeof(".nfs")+fileidsize+countersize-1;
	char           silly[slen+1];
	struct dentry *sdentry;
	struct rpc_task *task;
	int            error = -EIO;

	dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n",
		dentry->d_parent->d_name.name, dentry->d_name.name,
		dentry->d_count);
	nfs_inc_stats(dir, NFSIOS_SILLYRENAME);

	error = -EBUSY;
	if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
		goto out;

	sprintf(silly, ".nfs%*.*Lx",
		fileidsize, fileidsize,
		(unsigned long long)NFS_FILEID(dentry->d_inode));

	
	nfs_inode_return_delegation(dentry->d_inode);

	sdentry = NULL;
	do {
		char *suffix = silly + slen - countersize;

		dput(sdentry);
		sillycounter++;
		sprintf(suffix, "%*.*x", countersize, countersize, sillycounter);

		dfprintk(VFS, "NFS: trying to rename %s to %s\n",
				dentry->d_name.name, silly);

		sdentry = lookup_one_len(silly, dentry->d_parent, slen);
		if (IS_ERR(sdentry))
			goto out;
	} while (sdentry->d_inode != NULL); 

	error = nfs_async_unlink(dir, dentry);
	if (error)
		goto out_dput;

	
	error = nfs_copy_dname(sdentry,
				(struct nfs_unlinkdata *)dentry->d_fsdata);
	if (error) {
		nfs_cancel_async_unlink(dentry);
		goto out_dput;
	}

	
	task = nfs_async_rename(dir, dir, dentry, sdentry);
	if (IS_ERR(task)) {
		error = -EBUSY;
		nfs_cancel_async_unlink(dentry);
		goto out_dput;
	}

	
	error = rpc_wait_for_completion_task(task);
	if (error == 0)
		error = task->tk_status;
	switch (error) {
	case 0:
		/* The rename succeeded */
		nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
		d_move(dentry, sdentry);
		break;
	case -ERESTARTSYS:
		/* The result of the rename is unknown. Play it safe by
		 * forcing a new lookup */
		d_drop(dentry);
		d_drop(sdentry);
	}
	rpc_put_task(task);
out_dput:
	dput(sdentry);
out:
	return error;
}