[linux.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 int afs_symlink_read_folio(struct file *file, struct folio *folio);

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,
};

const struct address_space_operations afs_symlink_aops = {
	.read_folio	= afs_symlink_read_folio,
	.release_folio	= netfs_release_folio,
	.invalidate_folio = netfs_invalidate_folio,
	.migrate_folio	= filemap_migrate_folio,
};

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;
}

/*
 * Allocate a new read record.
 */
struct afs_read *afs_alloc_read(gfp_t gfp)
{
	struct afs_read *req;

	req = kzalloc(sizeof(struct afs_read), gfp);
	if (req)
		refcount_set(&req->usage, 1);

	return req;
}

/*
 * Dispose of a ref to a read record.
 */
void afs_put_read(struct afs_read *req)
{
	if (refcount_dec_and_test(&req->usage)) {
		if (req->cleanup)
			req->cleanup(req);
		key_put(req->key);
		kfree(req);
	}
}

static void afs_fetch_data_notify(struct afs_operation *op)
{
	struct afs_read *req = op->fetch.req;
	struct netfs_io_subrequest *subreq = req->subreq;
	int error = afs_op_error(op);

	req->error = error;
	if (subreq) {
		subreq->rreq->i_size = req->file_size;
		if (req->pos + req->actual_len >= req->file_size)
			__set_bit(NETFS_SREQ_HIT_EOF, &subreq->flags);
		netfs_read_subreq_terminated(subreq, error, false);
		req->subreq = NULL;
	} else if (req->done) {
		req->done(req);
	}
}

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.req->actual_len, &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);
}

static void afs_fetch_data_put(struct afs_operation *op)
{
	op->fetch.req->error = afs_op_error(op);
	afs_put_read(op->fetch.req);
}

static 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,
	.put		= afs_fetch_data_put,
};

/*
 * Fetch file data from the volume.
 */
int afs_fetch_data(struct afs_vnode *vnode, struct afs_read *req)
{
	struct afs_operation *op;

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

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

	afs_op_set_vnode(op, 0, vnode);

	op->fetch.req	= afs_get_read(req);
	op->ops		= &afs_fetch_data_operation;
	return afs_do_sync_operation(op);
}

static void afs_read_worker(struct work_struct *work)
{
	struct netfs_io_subrequest *subreq = container_of(work, struct netfs_io_subrequest, work);
	struct afs_vnode *vnode = AFS_FS_I(subreq->rreq->inode);
	struct afs_read *fsreq;

	fsreq = afs_alloc_read(GFP_NOFS);
	if (!fsreq)
		return netfs_read_subreq_terminated(subreq, -ENOMEM, false);

	fsreq->subreq	= subreq;
	fsreq->pos	= subreq->start + subreq->transferred;
	fsreq->len	= subreq->len   - subreq->transferred;
	fsreq->key	= key_get(subreq->rreq->netfs_priv);
	fsreq->vnode	= vnode;
	fsreq->iter	= &subreq->io_iter;

	trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
	afs_fetch_data(fsreq->vnode, fsreq);
	afs_put_read(fsreq);
}

static void afs_issue_read(struct netfs_io_subrequest *subreq)
{
	INIT_WORK(&subreq->work, afs_read_worker);
	queue_work(system_long_wq, &subreq->work);
}

static int afs_symlink_read_folio(struct file *file, struct folio *folio)
{
	struct afs_vnode *vnode = AFS_FS_I(folio->mapping->host);
	struct afs_read *fsreq;
	int ret;

	fsreq = afs_alloc_read(GFP_NOFS);
	if (!fsreq)
		return -ENOMEM;

	fsreq->pos	= folio_pos(folio);
	fsreq->len	= folio_size(folio);
	fsreq->vnode	= vnode;
	fsreq->iter	= &fsreq->def_iter;
	iov_iter_xarray(&fsreq->def_iter, ITER_DEST, &folio->mapping->i_pages,
			fsreq->pos, fsreq->len);

	ret = afs_fetch_data(fsreq->vnode, fsreq);
	if (ret == 0)
		folio_mark_uptodate(folio);
	folio_unlock(folio);
	return ret;
}

static int afs_init_request(struct netfs_io_request *rreq, struct file *file)
{
	if (file)
		rreq->netfs_priv = key_get(afs_file_key(file));
	rreq->rsize = 256 * 1024;
	rreq->wsize = 256 * 1024 * 1024;
	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);
d7e0f539	23	static int afs_symlink_read_folio(struct file file, struct folio folio);
1da177e4	24
3978d816	25	static ssize_t afs_file_read_iter(struct kiocb iocb, struct iov_iter iter);
d96d96ee DH	26	static ssize_t afs_file_splice_read(struct file in, loff_t ppos,
	27	struct pipe_inode_info *pipe,
	28	size_t len, unsigned int flags);
6e0e99d5 DH	29	static void afs_vm_open(struct vm_area_struct *area);
	30	static void afs_vm_close(struct vm_area_struct *area);
	31	static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff);
9b3f26c9	32
00d3b7a4 DH	33	const struct file_operations afs_file_operations = {
	34	.open = afs_open,
	35	.release = afs_release,
	36	.llseek = generic_file_llseek,
3978d816	37	.read_iter = afs_file_read_iter,
3560358a	38	.write_iter = netfs_file_write_iter,
1cf7a151	39	.mmap = afs_file_mmap,
d96d96ee	40	.splice_read = afs_file_splice_read,
06a17bbe	41	.splice_write = iter_file_splice_write,
31143d5d	42	.fsync = afs_fsync,
e8d6c554 DH	43	.lock = afs_lock,
e8d6c554 DH	44	.flock = afs_flock,
00d3b7a4 DH	45	};
00d3b7a4 DH	46
754661f1	47	const struct inode_operations afs_file_inode_operations = {
416351f2	48	.getattr = afs_getattr,
31143d5d	49	.setattr = afs_setattr,
00d3b7a4	50	.permission = afs_permission,
1da177e4 LT	51	};
1da177e4 LT	52
75bd228d	53	const struct address_space_operations afs_file_aops = {
3560358a	54	.direct_IO = noop_direct_IO,
6c62371b	55	.read_folio = netfs_read_folio,
bc899ee1	56	.readahead = netfs_readahead,
c9c4ff12	57	.dirty_folio = netfs_dirty_folio,
c1ec4d7c DH	58	.release_folio = netfs_release_folio,
c1ec4d7c DH	59	.invalidate_folio = netfs_invalidate_folio,
a9eb558a	60	.migrate_folio = filemap_migrate_folio,
3560358a	61	.writepages = afs_writepages,
1da177e4 LT	62	};
1da177e4 LT	63
75bd228d	64	const struct address_space_operations afs_symlink_aops = {
d7e0f539	65	.read_folio = afs_symlink_read_folio,
c1ec4d7c DH	66	.release_folio = netfs_release_folio,
c1ec4d7c DH	67	.invalidate_folio = netfs_invalidate_folio,
a9eb558a	68	.migrate_folio = filemap_migrate_folio,
75bd228d DH	69	};
75bd228d DH	70
1cf7a151	71	static const struct vm_operations_struct afs_vm_ops = {
6e0e99d5 DH	72	.open = afs_vm_open,
6e0e99d5 DH	73	.close = afs_vm_close,
1cf7a151	74	.fault = filemap_fault,
6e0e99d5	75	.map_pages = afs_vm_map_pages,
1cf7a151 DH	76	.page_mkwrite = afs_page_mkwrite,
	77	};
	78
4343d008 DH	79	/*
	80	* Discard a pin on a writeback key.
	81	*/
	82	void afs_put_wb_key(struct afs_wb_key *wbk)
	83	{
e49c7b2f	84	if (wbk && refcount_dec_and_test(&wbk->usage)) {
4343d008 DH	85	key_put(wbk->key);
	86	kfree(wbk);
	87	}
	88	}
	89
	90	/*
	91	* Cache key for writeback.
	92	*/
	93	int afs_cache_wb_key(struct afs_vnode vnode, struct afs_file af)
	94	{
	95	struct afs_wb_key wbk, p;
	96
	97	wbk = kzalloc(sizeof(struct afs_wb_key), GFP_KERNEL);
	98	if (!wbk)
	99	return -ENOMEM;
	100	refcount_set(&wbk->usage, 2);
	101	wbk->key = af->key;
	102
	103	spin_lock(&vnode->wb_lock);
	104	list_for_each_entry(p, &vnode->wb_keys, vnode_link) {
	105	if (p->key == wbk->key)
	106	goto found;
	107	}
	108
	109	key_get(wbk->key);
	110	list_add_tail(&wbk->vnode_link, &vnode->wb_keys);
	111	spin_unlock(&vnode->wb_lock);
	112	af->wb = wbk;
	113	return 0;
	114
	115	found:
	116	refcount_inc(&p->usage);
	117	spin_unlock(&vnode->wb_lock);
	118	af->wb = p;
	119	kfree(wbk);
	120	return 0;
	121	}
	122
00d3b7a4 DH	123	/*
	124	* open an AFS file or directory and attach a key to it
	125	*/
	126	int afs_open(struct inode inode, struct file file)
	127	{
	128	struct afs_vnode *vnode = AFS_FS_I(inode);
215804a9	129	struct afs_file *af;
00d3b7a4	130	struct key *key;
260a9803	131	int ret;
00d3b7a4	132
3b6492df	133	_enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode);
00d3b7a4 DH	134
	135	key = afs_request_key(vnode->volume->cell);
	136	if (IS_ERR(key)) {
215804a9 DH	137	ret = PTR_ERR(key);
215804a9 DH	138	goto error;
00d3b7a4 DH	139	}
00d3b7a4 DH	140
215804a9 DH	141	af = kzalloc(sizeof(*af), GFP_KERNEL);
	142	if (!af) {
	143	ret = -ENOMEM;
	144	goto error_key;
260a9803	145	}
4343d008	146	af->key = key;
260a9803	147
215804a9 DH	148	ret = afs_validate(vnode, key);
	149	if (ret < 0)
	150	goto error_af;
	151
4343d008 DH	152	if (file->f_mode & FMODE_WRITE) {
	153	ret = afs_cache_wb_key(vnode, af);
	154	if (ret < 0)
	155	goto error_af;
	156	}
5a813276 DH	157
	158	if (file->f_flags & O_TRUNC)
	159	set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
523d27cd DH	160
	161	fscache_use_cookie(afs_vnode_cache(vnode), file->f_mode & FMODE_WRITE);
	162
215804a9	163	file->private_data = af;
00d3b7a4 DH	164	_leave(" = 0");
00d3b7a4 DH	165	return 0;
215804a9 DH	166
	167	error_af:
	168	kfree(af);
	169	error_key:
	170	key_put(key);
	171	error:
	172	_leave(" = %d", ret);
	173	return ret;
00d3b7a4 DH	174	}
	175
	176	/*
	177	* release an AFS file or directory and discard its key
	178	*/
	179	int afs_release(struct inode inode, struct file file)
	180	{
523d27cd	181	struct afs_vnode_cache_aux aux;
00d3b7a4	182	struct afs_vnode *vnode = AFS_FS_I(inode);
215804a9	183	struct afs_file *af = file->private_data;
523d27cd	184	loff_t i_size;
a1b879ee	185	int ret = 0;
00d3b7a4	186
3b6492df	187	_enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode);
00d3b7a4	188
5a813276	189	if ((file->f_mode & FMODE_WRITE))
a1b879ee	190	ret = vfs_fsync(file, 0);
5a813276	191
215804a9	192	file->private_data = NULL;
4343d008 DH	193	if (af->wb)
4343d008 DH	194	afs_put_wb_key(af->wb);
523d27cd DH	195
523d27cd DH	196	if ((file->f_mode & FMODE_WRITE)) {
874c8ca1	197	i_size = i_size_read(&vnode->netfs.inode);
523d27cd DH	198	afs_set_cache_aux(vnode, &aux);
	199	fscache_unuse_cookie(afs_vnode_cache(vnode), &aux, &i_size);
	200	} else {
	201	fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
	202	}
	203
215804a9 DH	204	key_put(af->key);
215804a9 DH	205	kfree(af);
4343d008	206	afs_prune_wb_keys(vnode);
a1b879ee DH	207	_leave(" = %d", ret);
a1b879ee DH	208	return ret;
00d3b7a4 DH	209	}
00d3b7a4 DH	210
c4508464	211	/*
5cbf0398	212	* Allocate a new read record.
c4508464	213	*/
5cbf0398	214	struct afs_read *afs_alloc_read(gfp_t gfp)
c4508464	215	{
5cbf0398	216	struct afs_read *req;
c4508464	217
5cbf0398 DH	218	req = kzalloc(sizeof(struct afs_read), gfp);
	219	if (req)
	220	refcount_set(&req->usage, 1);
c4508464	221
5cbf0398	222	return req;
c4508464 DH	223	}
c4508464 DH	224
196ee9cd DH	225	/*
	226	* Dispose of a ref to a read record.
	227	*/
	228	void afs_put_read(struct afs_read *req)
	229	{
f3ddee8d	230	if (refcount_dec_and_test(&req->usage)) {
c4508464 DH	231	if (req->cleanup)
c4508464 DH	232	req->cleanup(req);
c69bf479	233	key_put(req->key);
196ee9cd DH	234	kfree(req);
	235	}
	236	}
	237
dc419184 DH	238	static void afs_fetch_data_notify(struct afs_operation *op)
	239	{
	240	struct afs_read *req = op->fetch.req;
6a19114b	241	struct netfs_io_subrequest *subreq = req->subreq;
2de5599f	242	int error = afs_op_error(op);
dc419184	243
dc419184	244	req->error = error;
5cbf0398	245	if (subreq) {
ee4cdf7b DH	246	subreq->rreq->i_size = req->file_size;
	247	if (req->pos + req->actual_len >= req->file_size)
	248	__set_bit(NETFS_SREQ_HIT_EOF, &subreq->flags);
	249	netfs_read_subreq_terminated(subreq, error, false);
5cbf0398 DH	250	req->subreq = NULL;
5cbf0398 DH	251	} else if (req->done) {
dc419184	252	req->done(req);
5cbf0398	253	}
dc419184 DH	254	}
dc419184 DH	255
e49c7b2f DH	256	static void afs_fetch_data_success(struct afs_operation *op)
	257	{
	258	struct afs_vnode *vnode = op->file[0].vnode;
	259
	260	_enter("op=%08x", op->debug_id);
e49c7b2f DH	261	afs_vnode_commit_status(op, &op->file[0]);
	262	afs_stat_v(vnode, n_fetches);
	263	atomic_long_add(op->fetch.req->actual_len, &op->net->n_fetch_bytes);
dc419184	264	afs_fetch_data_notify(op);
e49c7b2f DH	265	}
e49c7b2f DH	266
ee4cdf7b DH	267	static void afs_fetch_data_aborted(struct afs_operation *op)
	268	{
	269	afs_check_for_remote_deletion(op);
	270	afs_fetch_data_notify(op);
	271	}
	272
e49c7b2f DH	273	static void afs_fetch_data_put(struct afs_operation *op)
e49c7b2f DH	274	{
2de5599f	275	op->fetch.req->error = afs_op_error(op);
e49c7b2f DH	276	afs_put_read(op->fetch.req);
	277	}
	278
	279	static const struct afs_operation_ops afs_fetch_data_operation = {
	280	.issue_afs_rpc = afs_fs_fetch_data,
	281	.issue_yfs_rpc = yfs_fs_fetch_data,
	282	.success = afs_fetch_data_success,
ee4cdf7b	283	.aborted = afs_fetch_data_aborted,
dc419184	284	.failed = afs_fetch_data_notify,
e49c7b2f DH	285	.put = afs_fetch_data_put,
	286	};
	287
d2ddc776 DH	288	/*
	289	* Fetch file data from the volume.
	290	*/
c69bf479	291	int afs_fetch_data(struct afs_vnode vnode, struct afs_read req)
d2ddc776	292	{
e49c7b2f	293	struct afs_operation *op;
d2ddc776	294
3b6492df	295	_enter("%s{%llx:%llu.%u},%x,,,",
d2ddc776 DH	296	vnode->volume->name,
	297	vnode->fid.vid,
	298	vnode->fid.vnode,
	299	vnode->fid.unique,
c69bf479	300	key_serial(req->key));
d2ddc776	301
c69bf479	302	op = afs_alloc_operation(req->key, vnode->volume);
5cbf0398 DH	303	if (IS_ERR(op)) {
5cbf0398 DH	304	if (req->subreq)
ee4cdf7b	305	netfs_read_subreq_terminated(req->subreq, PTR_ERR(op), false);
e49c7b2f	306	return PTR_ERR(op);
5cbf0398	307	}
a58823ac	308
e49c7b2f	309	afs_op_set_vnode(op, 0, vnode);
d2ddc776	310
e49c7b2f DH	311	op->fetch.req = afs_get_read(req);
	312	op->ops = &afs_fetch_data_operation;
	313	return afs_do_sync_operation(op);
d2ddc776 DH	314	}
d2ddc776 DH	315
2e45b922	316	static void afs_read_worker(struct work_struct *work)
1da177e4	317	{
2e45b922	318	struct netfs_io_subrequest *subreq = container_of(work, struct netfs_io_subrequest, work);
5cbf0398 DH	319	struct afs_vnode *vnode = AFS_FS_I(subreq->rreq->inode);
5cbf0398 DH	320	struct afs_read *fsreq;
1da177e4	321
5cbf0398 DH	322	fsreq = afs_alloc_read(GFP_NOFS);
5cbf0398 DH	323	if (!fsreq)
ee4cdf7b	324	return netfs_read_subreq_terminated(subreq, -ENOMEM, false);
1da177e4	325
5cbf0398 DH	326	fsreq->subreq = subreq;
	327	fsreq->pos = subreq->start + subreq->transferred;
	328	fsreq->len = subreq->len - subreq->transferred;
345e1ae0	329	fsreq->key = key_get(subreq->rreq->netfs_priv);
5cbf0398	330	fsreq->vnode = vnode;
92b6cc5d	331	fsreq->iter = &subreq->io_iter;
c4508464	332
ee4cdf7b	333	trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
5cbf0398	334	afs_fetch_data(fsreq->vnode, fsreq);
345e1ae0	335	afs_put_read(fsreq);
ec26815a	336	}
1da177e4	337
2e45b922 DH	338	static void afs_issue_read(struct netfs_io_subrequest *subreq)
	339	{
	340	INIT_WORK(&subreq->work, afs_read_worker);
	341	queue_work(system_long_wq, &subreq->work);
	342	}
	343
d7e0f539	344	static int afs_symlink_read_folio(struct file file, struct folio folio)
f6d335c0	345	{
d7e0f539	346	struct afs_vnode *vnode = AFS_FS_I(folio->mapping->host);
5cbf0398	347	struct afs_read *fsreq;
f6d335c0 AV	348	int ret;
f6d335c0 AV	349
5cbf0398 DH	350	fsreq = afs_alloc_read(GFP_NOFS);
5cbf0398 DH	351	if (!fsreq)
91b467e0 DH	352	return -ENOMEM;
91b467e0 DH	353
78525c74 DH	354	fsreq->pos = folio_pos(folio);
78525c74 DH	355	fsreq->len = folio_size(folio);
5cbf0398 DH	356	fsreq->vnode = vnode;
5cbf0398 DH	357	fsreq->iter = &fsreq->def_iter;
de4eda9d	358	iov_iter_xarray(&fsreq->def_iter, ITER_DEST, &folio->mapping->i_pages,
5cbf0398	359	fsreq->pos, fsreq->len);
c4508464	360
5cbf0398	361	ret = afs_fetch_data(fsreq->vnode, fsreq);
78525c74	362	if (ret == 0)
d7e0f539 MWO	363	folio_mark_uptodate(folio);
d7e0f539 MWO	364	folio_unlock(folio);
5cbf0398 DH	365	return ret;
5cbf0398 DH	366	}
91b467e0	367
2de16041	368	static int afs_init_request(struct netfs_io_request rreq, struct file file)
5cbf0398	369	{
3560358a DH	370	if (file)
	371	rreq->netfs_priv = key_get(afs_file_key(file));
	372	rreq->rsize = 256 * 1024;
2df86547	373	rreq->wsize = 256 * 1024 * 1024;
2de16041	374	return 0;
5cbf0398	375	}
91b467e0	376
3003bbd0	377	static int afs_check_write_begin(struct file *file, loff_t pos, unsigned len,
fac47b43	378	struct folio foliop, void _fsdata)
3003bbd0 DH	379	{
	380	struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
	381
	382	return test_bit(AFS_VNODE_DELETED, &vnode->flags) ? -ESTALE : 0;
	383	}
	384
40a81101	385	static void afs_free_request(struct netfs_io_request *rreq)
1da177e4	386	{
40a81101	387	key_put(rreq->netfs_priv);
1ecb146f	388	afs_put_wb_key(rreq->netfs_priv2);
5cbf0398	389	}
f6d335c0	390
3560358a	391	static void afs_update_i_size(struct inode *inode, loff_t new_i_size)
c7f75ef3	392	{
3560358a DH	393	struct afs_vnode *vnode = AFS_FS_I(inode);
3560358a DH	394	loff_t i_size;
f86726a6	395
3560358a DH	396	write_seqlock(&vnode->cb_lock);
	397	i_size = i_size_read(&vnode->netfs.inode);
	398	if (new_i_size > i_size) {
	399	i_size_write(&vnode->netfs.inode, new_i_size);
	400	inode_set_bytes(&vnode->netfs.inode, new_i_size);
	401	}
	402	write_sequnlock(&vnode->cb_lock);
	403	fscache_update_cookie(afs_vnode_cache(vnode), NULL, &new_i_size);
f86726a6 DH	404	}
f86726a6 DH	405
3560358a	406	static void afs_netfs_invalidate_cache(struct netfs_io_request *wreq)
9b3f26c9	407	{
3560358a	408	struct afs_vnode *vnode = AFS_FS_I(wreq->inode);
9b3f26c9	409
3560358a	410	afs_invalidate_cache(vnode, 0);
9b3f26c9 DH	411	}
9b3f26c9 DH	412
6a19114b DH	413	const struct netfs_request_ops afs_req_ops = {
6a19114b DH	414	.init_request = afs_init_request,
40a81101	415	.free_request = afs_free_request,
3003bbd0	416	.check_write_begin = afs_check_write_begin,
f18a3785	417	.issue_read = afs_issue_read,
3560358a DH	418	.update_i_size = afs_update_i_size,
3560358a DH	419	.invalidate_cache = afs_netfs_invalidate_cache,
ed22e1db DH	420	.begin_writeback = afs_begin_writeback,
	421	.prepare_write = afs_prepare_write,
	422	.issue_write = afs_issue_write,
2cf36327	423	.retry_request = afs_retry_request,
5cbf0398	424	};
1cf7a151	425
6e0e99d5 DH	426	static void afs_add_open_mmap(struct afs_vnode *vnode)
	427	{
	428	if (atomic_inc_return(&vnode->cb_nr_mmap) == 1) {
453924de	429	down_write(&vnode->volume->open_mmaps_lock);
6e0e99d5	430
1744a22a	431	if (list_empty(&vnode->cb_mmap_link))
453924de	432	list_add_tail(&vnode->cb_mmap_link, &vnode->volume->open_mmaps);
6e0e99d5	433
453924de	434	up_write(&vnode->volume->open_mmaps_lock);
6e0e99d5 DH	435	}
	436	}
	437
	438	static void afs_drop_open_mmap(struct afs_vnode *vnode)
	439	{
275655d3	440	if (atomic_add_unless(&vnode->cb_nr_mmap, -1, 1))
6e0e99d5 DH	441	return;
6e0e99d5 DH	442
453924de	443	down_write(&vnode->volume->open_mmaps_lock);
6e0e99d5	444
275655d3 AV	445	read_seqlock_excl(&vnode->cb_lock);
	446	// the only place where ->cb_nr_mmap may hit 0
	447	// see __afs_break_callback() for the other side...
	448	if (atomic_dec_and_test(&vnode->cb_nr_mmap))
6e0e99d5	449	list_del_init(&vnode->cb_mmap_link);
275655d3	450	read_sequnlock_excl(&vnode->cb_lock);
6e0e99d5	451
453924de	452	up_write(&vnode->volume->open_mmaps_lock);
6e0e99d5 DH	453	flush_work(&vnode->cb_work);
	454	}
	455
1cf7a151 DH	456	/*
	457	* Handle setting up a memory mapping on an AFS file.
	458	*/
	459	static int afs_file_mmap(struct file file, struct vm_area_struct vma)
	460	{
6e0e99d5	461	struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
1cf7a151 DH	462	int ret;
1cf7a151 DH	463
6e0e99d5 DH	464	afs_add_open_mmap(vnode);
6e0e99d5 DH	465
1cf7a151 DH	466	ret = generic_file_mmap(file, vma);
	467	if (ret == 0)
	468	vma->vm_ops = &afs_vm_ops;
6e0e99d5 DH	469	else
6e0e99d5 DH	470	afs_drop_open_mmap(vnode);
1cf7a151 DH	471	return ret;
1cf7a151 DH	472	}
3978d816	473
6e0e99d5 DH	474	static void afs_vm_open(struct vm_area_struct *vma)
	475	{
	476	afs_add_open_mmap(AFS_FS_I(file_inode(vma->vm_file)));
	477	}
	478
	479	static void afs_vm_close(struct vm_area_struct *vma)
	480	{
	481	afs_drop_open_mmap(AFS_FS_I(file_inode(vma->vm_file)));
	482	}
	483
	484	static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff)
	485	{
	486	struct afs_vnode *vnode = AFS_FS_I(file_inode(vmf->vma->vm_file));
6e0e99d5	487
453924de	488	if (afs_check_validity(vnode))
6e0e99d5	489	return filemap_map_pages(vmf, start_pgoff, end_pgoff);
0050d7f5	490	return 0;
6e0e99d5 DH	491	}
6e0e99d5 DH	492
3978d816 DH	493	static ssize_t afs_file_read_iter(struct kiocb iocb, struct iov_iter iter)
3978d816 DH	494	{
3560358a DH	495	struct inode *inode = file_inode(iocb->ki_filp);
3560358a DH	496	struct afs_vnode *vnode = AFS_FS_I(inode);
3978d816	497	struct afs_file *af = iocb->ki_filp->private_data;
3560358a	498	ssize_t ret;
3978d816	499
3560358a DH	500	if (iocb->ki_flags & IOCB_DIRECT)
	501	return netfs_unbuffered_read_iter(iocb, iter);
	502
	503	ret = netfs_start_io_read(inode);
3978d816 DH	504	if (ret < 0)
3978d816 DH	505	return ret;
3560358a DH	506	ret = afs_validate(vnode, af->key);
	507	if (ret == 0)
	508	ret = filemap_read(iocb, iter, 0);
	509	netfs_end_io_read(inode);
	510	return ret;
3978d816	511	}
d96d96ee DH	512
	513	static ssize_t afs_file_splice_read(struct file in, loff_t ppos,
	514	struct pipe_inode_info *pipe,
	515	size_t len, unsigned int flags)
	516	{
3560358a DH	517	struct inode *inode = file_inode(in);
3560358a DH	518	struct afs_vnode *vnode = AFS_FS_I(inode);
d96d96ee	519	struct afs_file *af = in->private_data;
3560358a	520	ssize_t ret;
d96d96ee	521
3560358a	522	ret = netfs_start_io_read(inode);
d96d96ee DH	523	if (ret < 0)
d96d96ee DH	524	return ret;
3560358a DH	525	ret = afs_validate(vnode, af->key);
	526	if (ret == 0)
	527	ret = filemap_splice_read(in, ppos, pipe, len, flags);
	528	netfs_end_io_read(inode);
	529	return ret;
d96d96ee	530	}