[linux-block.git] / fs / afs / file.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* AFS filesystem file handling
 *
 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/gfp.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/netfs.h>
#include <trace/events/netfs.h>
#include "internal.h"

static int afs_file_mmap(struct file *file, struct vm_area_struct *vma);

static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter);
static ssize_t afs_file_splice_read(struct file *in, loff_t *ppos,
				    struct pipe_inode_info *pipe,
				    size_t len, unsigned int flags);
static void afs_vm_open(struct vm_area_struct *area);
static void afs_vm_close(struct vm_area_struct *area);
static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff);

const struct file_operations afs_file_operations = {
	.open		= afs_open,
	.release	= afs_release,
	.llseek		= generic_file_llseek,
	.read_iter	= afs_file_read_iter,
	.write_iter	= netfs_file_write_iter,
	.mmap		= afs_file_mmap,
	.splice_read	= afs_file_splice_read,
	.splice_write	= iter_file_splice_write,
	.fsync		= afs_fsync,
	.lock		= afs_lock,
	.flock		= afs_flock,
};

const struct inode_operations afs_file_inode_operations = {
	.getattr	= afs_getattr,
	.setattr	= afs_setattr,
	.permission	= afs_permission,
};

const struct address_space_operations afs_file_aops = {
	.direct_IO	= noop_direct_IO,
	.read_folio	= netfs_read_folio,
	.readahead	= netfs_readahead,
	.dirty_folio	= netfs_dirty_folio,
	.release_folio	= netfs_release_folio,
	.invalidate_folio = netfs_invalidate_folio,
	.migrate_folio	= filemap_migrate_folio,
	.writepages	= afs_writepages,
};

static const struct vm_operations_struct afs_vm_ops = {
	.open		= afs_vm_open,
	.close		= afs_vm_close,
	.fault		= filemap_fault,
	.map_pages	= afs_vm_map_pages,
	.page_mkwrite	= afs_page_mkwrite,
};

/*
 * Discard a pin on a writeback key.
 */
void afs_put_wb_key(struct afs_wb_key *wbk)
{
	if (wbk && refcount_dec_and_test(&wbk->usage)) {
		key_put(wbk->key);
		kfree(wbk);
	}
}

/*
 * Cache key for writeback.
 */
int afs_cache_wb_key(struct afs_vnode *vnode, struct afs_file *af)
{
	struct afs_wb_key *wbk, *p;

	wbk = kzalloc(sizeof(struct afs_wb_key), GFP_KERNEL);
	if (!wbk)
		return -ENOMEM;
	refcount_set(&wbk->usage, 2);
	wbk->key = af->key;

	spin_lock(&vnode->wb_lock);
	list_for_each_entry(p, &vnode->wb_keys, vnode_link) {
		if (p->key == wbk->key)
			goto found;
	}

	key_get(wbk->key);
	list_add_tail(&wbk->vnode_link, &vnode->wb_keys);
	spin_unlock(&vnode->wb_lock);
	af->wb = wbk;
	return 0;

found:
	refcount_inc(&p->usage);
	spin_unlock(&vnode->wb_lock);
	af->wb = p;
	kfree(wbk);
	return 0;
}

/*
 * open an AFS file or directory and attach a key to it
 */
int afs_open(struct inode *inode, struct file *file)
{
	struct afs_vnode *vnode = AFS_FS_I(inode);
	struct afs_file *af;
	struct key *key;
	int ret;

	_enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode);

	key = afs_request_key(vnode->volume->cell);
	if (IS_ERR(key)) {
		ret = PTR_ERR(key);
		goto error;
	}

	af = kzalloc(sizeof(*af), GFP_KERNEL);
	if (!af) {
		ret = -ENOMEM;
		goto error_key;
	}
	af->key = key;

	ret = afs_validate(vnode, key);
	if (ret < 0)
		goto error_af;

	if (file->f_mode & FMODE_WRITE) {
		ret = afs_cache_wb_key(vnode, af);
		if (ret < 0)
			goto error_af;
	}

	if (file->f_flags & O_TRUNC)
		set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);

	fscache_use_cookie(afs_vnode_cache(vnode), file->f_mode & FMODE_WRITE);

	file->private_data = af;
	_leave(" = 0");
	return 0;

error_af:
	kfree(af);
error_key:
	key_put(key);
error:
	_leave(" = %d", ret);
	return ret;
}

/*
 * release an AFS file or directory and discard its key
 */
int afs_release(struct inode *inode, struct file *file)
{
	struct afs_vnode_cache_aux aux;
	struct afs_vnode *vnode = AFS_FS_I(inode);
	struct afs_file *af = file->private_data;
	loff_t i_size;
	int ret = 0;

	_enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode);

	if ((file->f_mode & FMODE_WRITE))
		ret = vfs_fsync(file, 0);

	file->private_data = NULL;
	if (af->wb)
		afs_put_wb_key(af->wb);

	if ((file->f_mode & FMODE_WRITE)) {
		i_size = i_size_read(&vnode->netfs.inode);
		afs_set_cache_aux(vnode, &aux);
		fscache_unuse_cookie(afs_vnode_cache(vnode), &aux, &i_size);
	} else {
		fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
	}

	key_put(af->key);
	kfree(af);
	afs_prune_wb_keys(vnode);
	_leave(" = %d", ret);
	return ret;
}

static void afs_fetch_data_notify(struct afs_operation *op)
{
	struct netfs_io_subrequest *subreq = op->fetch.subreq;

	subreq->error = afs_op_error(op);
	netfs_read_subreq_terminated(subreq);
}

static void afs_fetch_data_success(struct afs_operation *op)
{
	struct afs_vnode *vnode = op->file[0].vnode;

	_enter("op=%08x", op->debug_id);
	afs_vnode_commit_status(op, &op->file[0]);
	afs_stat_v(vnode, n_fetches);
	atomic_long_add(op->fetch.subreq->transferred, &op->net->n_fetch_bytes);
	afs_fetch_data_notify(op);
}

static void afs_fetch_data_aborted(struct afs_operation *op)
{
	afs_check_for_remote_deletion(op);
	afs_fetch_data_notify(op);
}

const struct afs_operation_ops afs_fetch_data_operation = {
	.issue_afs_rpc	= afs_fs_fetch_data,
	.issue_yfs_rpc	= yfs_fs_fetch_data,
	.success	= afs_fetch_data_success,
	.aborted	= afs_fetch_data_aborted,
	.failed		= afs_fetch_data_notify,
};

static void afs_issue_read_call(struct afs_operation *op)
{
	op->call_responded = false;
	op->call_error = 0;
	op->call_abort_code = 0;
	if (test_bit(AFS_SERVER_FL_IS_YFS, &op->server->flags))
		yfs_fs_fetch_data(op);
	else
		afs_fs_fetch_data(op);
}

static void afs_end_read(struct afs_operation *op)
{
	if (op->call_responded && op->server)
		set_bit(AFS_SERVER_FL_RESPONDING, &op->server->flags);

	if (!afs_op_error(op))
		afs_fetch_data_success(op);
	else if (op->cumul_error.aborted)
		afs_fetch_data_aborted(op);
	else
		afs_fetch_data_notify(op);

	afs_end_vnode_operation(op);
	afs_put_operation(op);
}

/*
 * Perform I/O processing on an asynchronous call.  The work item carries a ref
 * to the call struct that we either need to release or to pass on.
 */
static void afs_read_receive(struct afs_call *call)
{
	struct afs_operation *op = call->op;
	enum afs_call_state state;

	_enter("");

	state = READ_ONCE(call->state);
	if (state == AFS_CALL_COMPLETE)
		return;
	trace_afs_read_recv(op, call);

	while (state < AFS_CALL_COMPLETE && READ_ONCE(call->need_attention)) {
		WRITE_ONCE(call->need_attention, false);
		afs_deliver_to_call(call);
		state = READ_ONCE(call->state);
	}

	if (state < AFS_CALL_COMPLETE) {
		netfs_read_subreq_progress(op->fetch.subreq);
		if (rxrpc_kernel_check_life(call->net->socket, call->rxcall))
			return;
		/* rxrpc terminated the call. */
		afs_set_call_complete(call, call->error, call->abort_code);
	}

	op->call_abort_code	= call->abort_code;
	op->call_error		= call->error;
	op->call_responded	= call->responded;
	op->call		= NULL;
	call->op		= NULL;
	afs_put_call(call);

	/* If the call failed, then we need to crank the server rotation
	 * handle and try the next.
	 */
	if (afs_select_fileserver(op)) {
		afs_issue_read_call(op);
		return;
	}

	afs_end_read(op);
}

void afs_fetch_data_async_rx(struct work_struct *work)
{
	struct afs_call *call = container_of(work, struct afs_call, async_work);

	afs_read_receive(call);
	afs_put_call(call);
}

void afs_fetch_data_immediate_cancel(struct afs_call *call)
{
	if (call->async) {
		afs_get_call(call, afs_call_trace_wake);
		if (!queue_work(afs_async_calls, &call->async_work))
			afs_deferred_put_call(call);
		flush_work(&call->async_work);
	}
}

/*
 * Fetch file data from the volume.
 */
static void afs_issue_read(struct netfs_io_subrequest *subreq)
{
	struct afs_operation *op;
	struct afs_vnode *vnode = AFS_FS_I(subreq->rreq->inode);
	struct key *key = subreq->rreq->netfs_priv;

	_enter("%s{%llx:%llu.%u},%x,,,",
	       vnode->volume->name,
	       vnode->fid.vid,
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       key_serial(key));

	op = afs_alloc_operation(key, vnode->volume);
	if (IS_ERR(op)) {
		subreq->error = PTR_ERR(op);
		netfs_read_subreq_terminated(subreq);
		return;
	}

	afs_op_set_vnode(op, 0, vnode);

	op->fetch.subreq = subreq;
	op->ops		= &afs_fetch_data_operation;

	trace_netfs_sreq(subreq, netfs_sreq_trace_submit);

	if (subreq->rreq->origin == NETFS_READAHEAD ||
	    subreq->rreq->iocb) {
		op->flags |= AFS_OPERATION_ASYNC;

		if (!afs_begin_vnode_operation(op)) {
			subreq->error = afs_put_operation(op);
			netfs_read_subreq_terminated(subreq);
			return;
		}

		if (!afs_select_fileserver(op)) {
			afs_end_read(op);
			return;
		}

		afs_issue_read_call(op);
	} else {
		afs_do_sync_operation(op);
	}
}

static int afs_init_request(struct netfs_io_request *rreq, struct file *file)
{
	struct afs_vnode *vnode = AFS_FS_I(rreq->inode);

	if (file)
		rreq->netfs_priv = key_get(afs_file_key(file));
	rreq->rsize = 256 * 1024;
	rreq->wsize = 256 * 1024 * 1024;

	switch (rreq->origin) {
	case NETFS_READ_SINGLE:
		if (!file) {
			struct key *key = afs_request_key(vnode->volume->cell);

			if (IS_ERR(key))
				return PTR_ERR(key);
			rreq->netfs_priv = key;
		}
		break;
	case NETFS_WRITEBACK:
	case NETFS_WRITETHROUGH:
	case NETFS_UNBUFFERED_WRITE:
	case NETFS_DIO_WRITE:
		if (S_ISREG(rreq->inode->i_mode))
			rreq->io_streams[0].avail = true;
		break;
	case NETFS_WRITEBACK_SINGLE:
	default:
		break;
	}
	return 0;
}

static int afs_check_write_begin(struct file *file, loff_t pos, unsigned len,
				 struct folio **foliop, void **_fsdata)
{
	struct afs_vnode *vnode = AFS_FS_I(file_inode(file));

	return test_bit(AFS_VNODE_DELETED, &vnode->flags) ? -ESTALE : 0;
}

static void afs_free_request(struct netfs_io_request *rreq)
{
	key_put(rreq->netfs_priv);
	afs_put_wb_key(rreq->netfs_priv2);
}

static void afs_update_i_size(struct inode *inode, loff_t new_i_size)
{
	struct afs_vnode *vnode = AFS_FS_I(inode);
	loff_t i_size;

	write_seqlock(&vnode->cb_lock);
	i_size = i_size_read(&vnode->netfs.inode);
	if (new_i_size > i_size) {
		i_size_write(&vnode->netfs.inode, new_i_size);
		inode_set_bytes(&vnode->netfs.inode, new_i_size);
	}
	write_sequnlock(&vnode->cb_lock);
	fscache_update_cookie(afs_vnode_cache(vnode), NULL, &new_i_size);
}

static void afs_netfs_invalidate_cache(struct netfs_io_request *wreq)
{
	struct afs_vnode *vnode = AFS_FS_I(wreq->inode);

	afs_invalidate_cache(vnode, 0);
}

const struct netfs_request_ops afs_req_ops = {
	.init_request		= afs_init_request,
	.free_request		= afs_free_request,
	.check_write_begin	= afs_check_write_begin,
	.issue_read		= afs_issue_read,
	.update_i_size		= afs_update_i_size,
	.invalidate_cache	= afs_netfs_invalidate_cache,
	.begin_writeback	= afs_begin_writeback,
	.prepare_write		= afs_prepare_write,
	.issue_write		= afs_issue_write,
	.retry_request		= afs_retry_request,
};

static void afs_add_open_mmap(struct afs_vnode *vnode)
{
	if (atomic_inc_return(&vnode->cb_nr_mmap) == 1) {
		down_write(&vnode->volume->open_mmaps_lock);

		if (list_empty(&vnode->cb_mmap_link))
			list_add_tail(&vnode->cb_mmap_link, &vnode->volume->open_mmaps);

		up_write(&vnode->volume->open_mmaps_lock);
	}
}

static void afs_drop_open_mmap(struct afs_vnode *vnode)
{
	if (atomic_add_unless(&vnode->cb_nr_mmap, -1, 1))
		return;

	down_write(&vnode->volume->open_mmaps_lock);

	read_seqlock_excl(&vnode->cb_lock);
	// the only place where ->cb_nr_mmap may hit 0
	// see __afs_break_callback() for the other side...
	if (atomic_dec_and_test(&vnode->cb_nr_mmap))
		list_del_init(&vnode->cb_mmap_link);
	read_sequnlock_excl(&vnode->cb_lock);

	up_write(&vnode->volume->open_mmaps_lock);
	flush_work(&vnode->cb_work);
}

/*
 * Handle setting up a memory mapping on an AFS file.
 */
static int afs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
	int ret;

	afs_add_open_mmap(vnode);

	ret = generic_file_mmap(file, vma);
	if (ret == 0)
		vma->vm_ops = &afs_vm_ops;
	else
		afs_drop_open_mmap(vnode);
	return ret;
}

static void afs_vm_open(struct vm_area_struct *vma)
{
	afs_add_open_mmap(AFS_FS_I(file_inode(vma->vm_file)));
}

static void afs_vm_close(struct vm_area_struct *vma)
{
	afs_drop_open_mmap(AFS_FS_I(file_inode(vma->vm_file)));
}

static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff)
{
	struct afs_vnode *vnode = AFS_FS_I(file_inode(vmf->vma->vm_file));

	if (afs_check_validity(vnode))
		return filemap_map_pages(vmf, start_pgoff, end_pgoff);
	return 0;
}

static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
	struct inode *inode = file_inode(iocb->ki_filp);
	struct afs_vnode *vnode = AFS_FS_I(inode);
	struct afs_file *af = iocb->ki_filp->private_data;
	ssize_t ret;

	if (iocb->ki_flags & IOCB_DIRECT)
		return netfs_unbuffered_read_iter(iocb, iter);

	ret = netfs_start_io_read(inode);
	if (ret < 0)
		return ret;
	ret = afs_validate(vnode, af->key);
	if (ret == 0)
		ret = filemap_read(iocb, iter, 0);
	netfs_end_io_read(inode);
	return ret;
}

static ssize_t afs_file_splice_read(struct file *in, loff_t *ppos,
				    struct pipe_inode_info *pipe,
				    size_t len, unsigned int flags)
{
	struct inode *inode = file_inode(in);
	struct afs_vnode *vnode = AFS_FS_I(inode);
	struct afs_file *af = in->private_data;
	ssize_t ret;

	ret = netfs_start_io_read(inode);
	if (ret < 0)
		return ret;
	ret = afs_validate(vnode, af->key);
	if (ret == 0)
		ret = filemap_splice_read(in, ppos, pipe, len, flags);
	netfs_end_io_read(inode);
	return ret;
}
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
08e0e7c8	2	/* AFS filesystem file handling
1da177e4	3	*
08e0e7c8	4	* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
1da177e4	5	* Written by David Howells (dhowells@redhat.com)
1da177e4 LT	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/module.h>
	10	#include <linux/init.h>
1da177e4 LT	11	#include <linux/fs.h>
1da177e4 LT	12	#include <linux/pagemap.h>
31143d5d	13	#include <linux/writeback.h>
5a0e3ad6	14	#include <linux/gfp.h>
91b467e0	15	#include <linux/task_io_accounting_ops.h>
f86196ea	16	#include <linux/mm.h>
d7bdba1c	17	#include <linux/swap.h>
5cbf0398	18	#include <linux/netfs.h>
ee4cdf7b	19	#include <trace/events/netfs.h>
1da177e4 LT	20	#include "internal.h"
1da177e4 LT	21
1cf7a151	22	static int afs_file_mmap(struct file file, struct vm_area_struct vma);
1da177e4	23
3978d816	24	static ssize_t afs_file_read_iter(struct kiocb iocb, struct iov_iter iter);
d96d96ee DH	25	static ssize_t afs_file_splice_read(struct file in, loff_t ppos,
	26	struct pipe_inode_info *pipe,
	27	size_t len, unsigned int flags);
6e0e99d5 DH	28	static void afs_vm_open(struct vm_area_struct *area);
	29	static void afs_vm_close(struct vm_area_struct *area);
	30	static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff);
9b3f26c9	31
00d3b7a4 DH	32	const struct file_operations afs_file_operations = {
	33	.open = afs_open,
	34	.release = afs_release,
	35	.llseek = generic_file_llseek,
3978d816	36	.read_iter = afs_file_read_iter,
3560358a	37	.write_iter = netfs_file_write_iter,
1cf7a151	38	.mmap = afs_file_mmap,
d96d96ee	39	.splice_read = afs_file_splice_read,
06a17bbe	40	.splice_write = iter_file_splice_write,
31143d5d	41	.fsync = afs_fsync,
e8d6c554 DH	42	.lock = afs_lock,
e8d6c554 DH	43	.flock = afs_flock,
00d3b7a4 DH	44	};
00d3b7a4 DH	45
754661f1	46	const struct inode_operations afs_file_inode_operations = {
416351f2	47	.getattr = afs_getattr,
31143d5d	48	.setattr = afs_setattr,
00d3b7a4	49	.permission = afs_permission,
1da177e4 LT	50	};
1da177e4 LT	51
75bd228d	52	const struct address_space_operations afs_file_aops = {
3560358a	53	.direct_IO = noop_direct_IO,
6c62371b	54	.read_folio = netfs_read_folio,
bc899ee1	55	.readahead = netfs_readahead,
c9c4ff12	56	.dirty_folio = netfs_dirty_folio,
c1ec4d7c DH	57	.release_folio = netfs_release_folio,
c1ec4d7c DH	58	.invalidate_folio = netfs_invalidate_folio,
a9eb558a	59	.migrate_folio = filemap_migrate_folio,
3560358a	60	.writepages = afs_writepages,
1da177e4 LT	61	};
1da177e4 LT	62
1cf7a151	63	static const struct vm_operations_struct afs_vm_ops = {
6e0e99d5 DH	64	.open = afs_vm_open,
6e0e99d5 DH	65	.close = afs_vm_close,
1cf7a151	66	.fault = filemap_fault,
6e0e99d5	67	.map_pages = afs_vm_map_pages,
1cf7a151 DH	68	.page_mkwrite = afs_page_mkwrite,
	69	};
	70
4343d008 DH	71	/*
	72	* Discard a pin on a writeback key.
	73	*/
	74	void afs_put_wb_key(struct afs_wb_key *wbk)
	75	{
e49c7b2f	76	if (wbk && refcount_dec_and_test(&wbk->usage)) {
4343d008 DH	77	key_put(wbk->key);
	78	kfree(wbk);
	79	}
	80	}
	81
	82	/*
	83	* Cache key for writeback.
	84	*/
	85	int afs_cache_wb_key(struct afs_vnode vnode, struct afs_file af)
	86	{
	87	struct afs_wb_key wbk, p;
	88
	89	wbk = kzalloc(sizeof(struct afs_wb_key), GFP_KERNEL);
	90	if (!wbk)
	91	return -ENOMEM;
	92	refcount_set(&wbk->usage, 2);
	93	wbk->key = af->key;
	94
	95	spin_lock(&vnode->wb_lock);
	96	list_for_each_entry(p, &vnode->wb_keys, vnode_link) {
	97	if (p->key == wbk->key)
	98	goto found;
	99	}
	100
	101	key_get(wbk->key);
	102	list_add_tail(&wbk->vnode_link, &vnode->wb_keys);
	103	spin_unlock(&vnode->wb_lock);
	104	af->wb = wbk;
	105	return 0;
	106
	107	found:
	108	refcount_inc(&p->usage);
	109	spin_unlock(&vnode->wb_lock);
	110	af->wb = p;
	111	kfree(wbk);
	112	return 0;
	113	}
	114
00d3b7a4 DH	115	/*
	116	* open an AFS file or directory and attach a key to it
	117	*/
	118	int afs_open(struct inode inode, struct file file)
	119	{
	120	struct afs_vnode *vnode = AFS_FS_I(inode);
215804a9	121	struct afs_file *af;
00d3b7a4	122	struct key *key;
260a9803	123	int ret;
00d3b7a4	124
3b6492df	125	_enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode);
00d3b7a4 DH	126
	127	key = afs_request_key(vnode->volume->cell);
	128	if (IS_ERR(key)) {
215804a9 DH	129	ret = PTR_ERR(key);
215804a9 DH	130	goto error;
00d3b7a4 DH	131	}
00d3b7a4 DH	132
215804a9 DH	133	af = kzalloc(sizeof(*af), GFP_KERNEL);
	134	if (!af) {
	135	ret = -ENOMEM;
	136	goto error_key;
260a9803	137	}
4343d008	138	af->key = key;
260a9803	139
215804a9 DH	140	ret = afs_validate(vnode, key);
	141	if (ret < 0)
	142	goto error_af;
	143
4343d008 DH	144	if (file->f_mode & FMODE_WRITE) {
	145	ret = afs_cache_wb_key(vnode, af);
	146	if (ret < 0)
	147	goto error_af;
	148	}
5a813276 DH	149
	150	if (file->f_flags & O_TRUNC)
	151	set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
523d27cd DH	152
	153	fscache_use_cookie(afs_vnode_cache(vnode), file->f_mode & FMODE_WRITE);
	154
215804a9	155	file->private_data = af;
00d3b7a4 DH	156	_leave(" = 0");
00d3b7a4 DH	157	return 0;
215804a9 DH	158
	159	error_af:
	160	kfree(af);
	161	error_key:
	162	key_put(key);
	163	error:
	164	_leave(" = %d", ret);
	165	return ret;
00d3b7a4 DH	166	}
	167
	168	/*
	169	* release an AFS file or directory and discard its key
	170	*/
	171	int afs_release(struct inode inode, struct file file)
	172	{
523d27cd	173	struct afs_vnode_cache_aux aux;
00d3b7a4	174	struct afs_vnode *vnode = AFS_FS_I(inode);
215804a9	175	struct afs_file *af = file->private_data;
523d27cd	176	loff_t i_size;
a1b879ee	177	int ret = 0;
00d3b7a4	178
3b6492df	179	_enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode);
00d3b7a4	180
5a813276	181	if ((file->f_mode & FMODE_WRITE))
a1b879ee	182	ret = vfs_fsync(file, 0);
5a813276	183
215804a9	184	file->private_data = NULL;
4343d008 DH	185	if (af->wb)
4343d008 DH	186	afs_put_wb_key(af->wb);
523d27cd DH	187
523d27cd DH	188	if ((file->f_mode & FMODE_WRITE)) {
874c8ca1	189	i_size = i_size_read(&vnode->netfs.inode);
523d27cd DH	190	afs_set_cache_aux(vnode, &aux);
	191	fscache_unuse_cookie(afs_vnode_cache(vnode), &aux, &i_size);
	192	} else {
	193	fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
	194	}
	195
215804a9 DH	196	key_put(af->key);
215804a9 DH	197	kfree(af);
4343d008	198	afs_prune_wb_keys(vnode);
a1b879ee DH	199	_leave(" = %d", ret);
a1b879ee DH	200	return ret;
00d3b7a4 DH	201	}
00d3b7a4 DH	202
dc419184 DH	203	static void afs_fetch_data_notify(struct afs_operation *op)
dc419184 DH	204	{
f28fc201 DH	205	struct netfs_io_subrequest *subreq = op->fetch.subreq;
	206
	207	subreq->error = afs_op_error(op);
	208	netfs_read_subreq_terminated(subreq);
dc419184 DH	209	}
dc419184 DH	210
e49c7b2f DH	211	static void afs_fetch_data_success(struct afs_operation *op)
	212	{
	213	struct afs_vnode *vnode = op->file[0].vnode;
	214
	215	_enter("op=%08x", op->debug_id);
e49c7b2f DH	216	afs_vnode_commit_status(op, &op->file[0]);
e49c7b2f DH	217	afs_stat_v(vnode, n_fetches);
f28fc201	218	atomic_long_add(op->fetch.subreq->transferred, &op->net->n_fetch_bytes);
dc419184	219	afs_fetch_data_notify(op);
e49c7b2f DH	220	}
e49c7b2f DH	221
ee4cdf7b DH	222	static void afs_fetch_data_aborted(struct afs_operation *op)
	223	{
	224	afs_check_for_remote_deletion(op);
	225	afs_fetch_data_notify(op);
	226	}
	227
f28fc201	228	const struct afs_operation_ops afs_fetch_data_operation = {
e49c7b2f DH	229	.issue_afs_rpc = afs_fs_fetch_data,
	230	.issue_yfs_rpc = yfs_fs_fetch_data,
	231	.success = afs_fetch_data_success,
ee4cdf7b	232	.aborted = afs_fetch_data_aborted,
dc419184	233	.failed = afs_fetch_data_notify,
e49c7b2f DH	234	};
e49c7b2f DH	235
eddf51f2 DH	236	static void afs_issue_read_call(struct afs_operation *op)
	237	{
	238	op->call_responded = false;
	239	op->call_error = 0;
	240	op->call_abort_code = 0;
	241	if (test_bit(AFS_SERVER_FL_IS_YFS, &op->server->flags))
	242	yfs_fs_fetch_data(op);
	243	else
	244	afs_fs_fetch_data(op);
	245	}
	246
	247	static void afs_end_read(struct afs_operation *op)
	248	{
	249	if (op->call_responded && op->server)
	250	set_bit(AFS_SERVER_FL_RESPONDING, &op->server->flags);
	251
	252	if (!afs_op_error(op))
	253	afs_fetch_data_success(op);
	254	else if (op->cumul_error.aborted)
	255	afs_fetch_data_aborted(op);
	256	else
	257	afs_fetch_data_notify(op);
	258
	259	afs_end_vnode_operation(op);
	260	afs_put_operation(op);
	261	}
	262
	263	/*
	264	* Perform I/O processing on an asynchronous call. The work item carries a ref
	265	* to the call struct that we either need to release or to pass on.
	266	*/
	267	static void afs_read_receive(struct afs_call *call)
	268	{
	269	struct afs_operation *op = call->op;
	270	enum afs_call_state state;
	271
	272	_enter("");
	273
	274	state = READ_ONCE(call->state);
	275	if (state == AFS_CALL_COMPLETE)
	276	return;
3c49e529	277	trace_afs_read_recv(op, call);
eddf51f2 DH	278
	279	while (state < AFS_CALL_COMPLETE && READ_ONCE(call->need_attention)) {
	280	WRITE_ONCE(call->need_attention, false);
	281	afs_deliver_to_call(call);
	282	state = READ_ONCE(call->state);
	283	}
	284
	285	if (state < AFS_CALL_COMPLETE) {
	286	netfs_read_subreq_progress(op->fetch.subreq);
	287	if (rxrpc_kernel_check_life(call->net->socket, call->rxcall))
	288	return;
	289	/* rxrpc terminated the call. */
	290	afs_set_call_complete(call, call->error, call->abort_code);
	291	}
	292
	293	op->call_abort_code = call->abort_code;
	294	op->call_error = call->error;
	295	op->call_responded = call->responded;
	296	op->call = NULL;
	297	call->op = NULL;
	298	afs_put_call(call);
	299
	300	/* If the call failed, then we need to crank the server rotation
	301	* handle and try the next.
	302	*/
	303	if (afs_select_fileserver(op)) {
	304	afs_issue_read_call(op);
	305	return;
	306	}
	307
	308	afs_end_read(op);
	309	}
	310
	311	void afs_fetch_data_async_rx(struct work_struct *work)
	312	{
	313	struct afs_call *call = container_of(work, struct afs_call, async_work);
	314
	315	afs_read_receive(call);
	316	afs_put_call(call);
	317	}
	318
	319	void afs_fetch_data_immediate_cancel(struct afs_call *call)
	320	{
	321	if (call->async) {
	322	afs_get_call(call, afs_call_trace_wake);
	323	if (!queue_work(afs_async_calls, &call->async_work))
	324	afs_deferred_put_call(call);
	325	flush_work(&call->async_work);
	326	}
	327	}
	328
d2ddc776 DH	329	/*
	330	* Fetch file data from the volume.
	331	*/
eddf51f2	332	static void afs_issue_read(struct netfs_io_subrequest *subreq)
d2ddc776	333	{
e49c7b2f	334	struct afs_operation *op;
f28fc201 DH	335	struct afs_vnode *vnode = AFS_FS_I(subreq->rreq->inode);
f28fc201 DH	336	struct key *key = subreq->rreq->netfs_priv;
d2ddc776	337
3b6492df	338	_enter("%s{%llx:%llu.%u},%x,,,",
d2ddc776 DH	339	vnode->volume->name,
	340	vnode->fid.vid,
	341	vnode->fid.vnode,
	342	vnode->fid.unique,
f28fc201	343	key_serial(key));
d2ddc776	344
f28fc201	345	op = afs_alloc_operation(key, vnode->volume);
5cbf0398	346	if (IS_ERR(op)) {
f28fc201 DH	347	subreq->error = PTR_ERR(op);
	348	netfs_read_subreq_terminated(subreq);
	349	return;
5cbf0398	350	}
a58823ac	351
e49c7b2f	352	afs_op_set_vnode(op, 0, vnode);
d2ddc776	353
f28fc201	354	op->fetch.subreq = subreq;
e49c7b2f	355	op->ops = &afs_fetch_data_operation;
c4508464	356
ee4cdf7b	357	trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
1da177e4	358
eddf51f2 DH	359	if (subreq->rreq->origin == NETFS_READAHEAD \|\|
	360	subreq->rreq->iocb) {
	361	op->flags \|= AFS_OPERATION_ASYNC;
	362
	363	if (!afs_begin_vnode_operation(op)) {
	364	subreq->error = afs_put_operation(op);
	365	netfs_read_subreq_terminated(subreq);
	366	return;
	367	}
	368
	369	if (!afs_select_fileserver(op)) {
	370	afs_end_read(op);
	371	return;
	372	}
	373
	374	afs_issue_read_call(op);
	375	} else {
	376	afs_do_sync_operation(op);
	377	}
2e45b922 DH	378	}
2e45b922 DH	379
2de16041	380	static int afs_init_request(struct netfs_io_request rreq, struct file file)
5cbf0398	381	{
b2604315 DH	382	struct afs_vnode *vnode = AFS_FS_I(rreq->inode);
b2604315 DH	383
3560358a DH	384	if (file)
	385	rreq->netfs_priv = key_get(afs_file_key(file));
	386	rreq->rsize = 256 * 1024;
2df86547	387	rreq->wsize = 256 * 1024 * 1024;
b2604315 DH	388
	389	switch (rreq->origin) {
	390	case NETFS_READ_SINGLE:
	391	if (!file) {
	392	struct key *key = afs_request_key(vnode->volume->cell);
	393
	394	if (IS_ERR(key))
	395	return PTR_ERR(key);
	396	rreq->netfs_priv = key;
	397	}
	398	break;
6dd80936 DH	399	case NETFS_WRITEBACK:
	400	case NETFS_WRITETHROUGH:
	401	case NETFS_UNBUFFERED_WRITE:
	402	case NETFS_DIO_WRITE:
	403	if (S_ISREG(rreq->inode->i_mode))
	404	rreq->io_streams[0].avail = true;
	405	break;
	406	case NETFS_WRITEBACK_SINGLE:
b2604315 DH	407	default:
	408	break;
	409	}
2de16041	410	return 0;
5cbf0398	411	}
91b467e0	412
3003bbd0	413	static int afs_check_write_begin(struct file *file, loff_t pos, unsigned len,
fac47b43	414	struct folio foliop, void _fsdata)
3003bbd0 DH	415	{
	416	struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
	417
	418	return test_bit(AFS_VNODE_DELETED, &vnode->flags) ? -ESTALE : 0;
	419	}
	420
40a81101	421	static void afs_free_request(struct netfs_io_request *rreq)
1da177e4	422	{
40a81101	423	key_put(rreq->netfs_priv);
1ecb146f	424	afs_put_wb_key(rreq->netfs_priv2);
5cbf0398	425	}
f6d335c0	426
3560358a	427	static void afs_update_i_size(struct inode *inode, loff_t new_i_size)
c7f75ef3	428	{
3560358a DH	429	struct afs_vnode *vnode = AFS_FS_I(inode);
3560358a DH	430	loff_t i_size;
f86726a6	431
3560358a DH	432	write_seqlock(&vnode->cb_lock);
	433	i_size = i_size_read(&vnode->netfs.inode);
	434	if (new_i_size > i_size) {
	435	i_size_write(&vnode->netfs.inode, new_i_size);
	436	inode_set_bytes(&vnode->netfs.inode, new_i_size);
	437	}
	438	write_sequnlock(&vnode->cb_lock);
	439	fscache_update_cookie(afs_vnode_cache(vnode), NULL, &new_i_size);
f86726a6 DH	440	}
f86726a6 DH	441
3560358a	442	static void afs_netfs_invalidate_cache(struct netfs_io_request *wreq)
9b3f26c9	443	{
3560358a	444	struct afs_vnode *vnode = AFS_FS_I(wreq->inode);
9b3f26c9	445
3560358a	446	afs_invalidate_cache(vnode, 0);
9b3f26c9 DH	447	}
9b3f26c9 DH	448
6a19114b DH	449	const struct netfs_request_ops afs_req_ops = {
6a19114b DH	450	.init_request = afs_init_request,
40a81101	451	.free_request = afs_free_request,
3003bbd0	452	.check_write_begin = afs_check_write_begin,
f18a3785	453	.issue_read = afs_issue_read,
3560358a DH	454	.update_i_size = afs_update_i_size,
3560358a DH	455	.invalidate_cache = afs_netfs_invalidate_cache,
ed22e1db DH	456	.begin_writeback = afs_begin_writeback,
	457	.prepare_write = afs_prepare_write,
	458	.issue_write = afs_issue_write,
2cf36327	459	.retry_request = afs_retry_request,
5cbf0398	460	};
1cf7a151	461
6e0e99d5 DH	462	static void afs_add_open_mmap(struct afs_vnode *vnode)
	463	{
	464	if (atomic_inc_return(&vnode->cb_nr_mmap) == 1) {
453924de	465	down_write(&vnode->volume->open_mmaps_lock);
6e0e99d5	466
1744a22a	467	if (list_empty(&vnode->cb_mmap_link))
453924de	468	list_add_tail(&vnode->cb_mmap_link, &vnode->volume->open_mmaps);
6e0e99d5	469
453924de	470	up_write(&vnode->volume->open_mmaps_lock);
6e0e99d5 DH	471	}
	472	}
	473
	474	static void afs_drop_open_mmap(struct afs_vnode *vnode)
	475	{
275655d3	476	if (atomic_add_unless(&vnode->cb_nr_mmap, -1, 1))
6e0e99d5 DH	477	return;
6e0e99d5 DH	478
453924de	479	down_write(&vnode->volume->open_mmaps_lock);
6e0e99d5	480
275655d3 AV	481	read_seqlock_excl(&vnode->cb_lock);
	482	// the only place where ->cb_nr_mmap may hit 0
	483	// see __afs_break_callback() for the other side...
	484	if (atomic_dec_and_test(&vnode->cb_nr_mmap))
6e0e99d5	485	list_del_init(&vnode->cb_mmap_link);
275655d3	486	read_sequnlock_excl(&vnode->cb_lock);
6e0e99d5	487
453924de	488	up_write(&vnode->volume->open_mmaps_lock);
6e0e99d5 DH	489	flush_work(&vnode->cb_work);
	490	}
	491
1cf7a151 DH	492	/*
	493	* Handle setting up a memory mapping on an AFS file.
	494	*/
	495	static int afs_file_mmap(struct file file, struct vm_area_struct vma)
	496	{
6e0e99d5	497	struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
1cf7a151 DH	498	int ret;
1cf7a151 DH	499
6e0e99d5 DH	500	afs_add_open_mmap(vnode);
6e0e99d5 DH	501
1cf7a151 DH	502	ret = generic_file_mmap(file, vma);
	503	if (ret == 0)
	504	vma->vm_ops = &afs_vm_ops;
6e0e99d5 DH	505	else
6e0e99d5 DH	506	afs_drop_open_mmap(vnode);
1cf7a151 DH	507	return ret;
1cf7a151 DH	508	}
3978d816	509
6e0e99d5 DH	510	static void afs_vm_open(struct vm_area_struct *vma)
	511	{
	512	afs_add_open_mmap(AFS_FS_I(file_inode(vma->vm_file)));
	513	}
	514
	515	static void afs_vm_close(struct vm_area_struct *vma)
	516	{
	517	afs_drop_open_mmap(AFS_FS_I(file_inode(vma->vm_file)));
	518	}
	519
	520	static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff)
	521	{
	522	struct afs_vnode *vnode = AFS_FS_I(file_inode(vmf->vma->vm_file));
6e0e99d5	523
453924de	524	if (afs_check_validity(vnode))
6e0e99d5	525	return filemap_map_pages(vmf, start_pgoff, end_pgoff);
0050d7f5	526	return 0;
6e0e99d5 DH	527	}
6e0e99d5 DH	528
3978d816 DH	529	static ssize_t afs_file_read_iter(struct kiocb iocb, struct iov_iter iter)
3978d816 DH	530	{
3560358a DH	531	struct inode *inode = file_inode(iocb->ki_filp);
3560358a DH	532	struct afs_vnode *vnode = AFS_FS_I(inode);
3978d816	533	struct afs_file *af = iocb->ki_filp->private_data;
3560358a	534	ssize_t ret;
3978d816	535
3560358a DH	536	if (iocb->ki_flags & IOCB_DIRECT)
	537	return netfs_unbuffered_read_iter(iocb, iter);
	538
	539	ret = netfs_start_io_read(inode);
3978d816 DH	540	if (ret < 0)
3978d816 DH	541	return ret;
3560358a DH	542	ret = afs_validate(vnode, af->key);
	543	if (ret == 0)
	544	ret = filemap_read(iocb, iter, 0);
	545	netfs_end_io_read(inode);
	546	return ret;
3978d816	547	}
d96d96ee DH	548
	549	static ssize_t afs_file_splice_read(struct file in, loff_t ppos,
	550	struct pipe_inode_info *pipe,
	551	size_t len, unsigned int flags)
	552	{
3560358a DH	553	struct inode *inode = file_inode(in);
3560358a DH	554	struct afs_vnode *vnode = AFS_FS_I(inode);
d96d96ee	555	struct afs_file *af = in->private_data;
3560358a	556	ssize_t ret;
d96d96ee	557
3560358a	558	ret = netfs_start_io_read(inode);
d96d96ee DH	559	if (ret < 0)
d96d96ee DH	560	return ret;
3560358a DH	561	ret = afs_validate(vnode, af->key);
	562	if (ret == 0)
	563	ret = filemap_splice_read(in, ppos, pipe, len, flags);
	564	netfs_end_io_read(inode);
	565	return ret;
d96d96ee	566	}