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

// SPDX-License-Identifier: GPL-2.0
/*
 * File operations for Coda.
 * Original version: (C) 1996 Peter Braam 
 * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
 *
 * Carnegie Mellon encourages users of this code to contribute improvements
 * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
 */

#include <linux/refcount.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/stat.h>
#include <linux/cred.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/uio.h>

#include <linux/coda.h>
#include "coda_psdev.h"
#include "coda_linux.h"
#include "coda_int.h"

struct coda_vm_ops {
	refcount_t refcnt;
	struct file *coda_file;
	const struct vm_operations_struct *host_vm_ops;
	struct vm_operations_struct vm_ops;
};

static ssize_t
coda_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
	struct file *coda_file = iocb->ki_filp;
	struct inode *coda_inode = file_inode(coda_file);
	struct coda_file_info *cfi = coda_ftoc(coda_file);
	loff_t ki_pos = iocb->ki_pos;
	size_t count = iov_iter_count(to);
	ssize_t ret;

	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
				  &cfi->cfi_access_intent,
				  count, ki_pos, CODA_ACCESS_TYPE_READ);
	if (ret)
		goto finish_read;

	ret = vfs_iter_read(cfi->cfi_container, to, &iocb->ki_pos, 0);

finish_read:
	venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
			    &cfi->cfi_access_intent,
			    count, ki_pos, CODA_ACCESS_TYPE_READ_FINISH);
	return ret;
}

static ssize_t
coda_file_write_iter(struct kiocb *iocb, struct iov_iter *to)
{
	struct file *coda_file = iocb->ki_filp;
	struct inode *coda_inode = file_inode(coda_file);
	struct coda_file_info *cfi = coda_ftoc(coda_file);
	struct file *host_file = cfi->cfi_container;
	loff_t ki_pos = iocb->ki_pos;
	size_t count = iov_iter_count(to);
	ssize_t ret;

	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
				  &cfi->cfi_access_intent,
				  count, ki_pos, CODA_ACCESS_TYPE_WRITE);
	if (ret)
		goto finish_write;

	file_start_write(host_file);
	inode_lock(coda_inode);
	ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos, 0);
	coda_inode->i_size = file_inode(host_file)->i_size;
	coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
	coda_inode->i_mtime = coda_inode->i_ctime = current_time(coda_inode);
	inode_unlock(coda_inode);
	file_end_write(host_file);

finish_write:
	venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
			    &cfi->cfi_access_intent,
			    count, ki_pos, CODA_ACCESS_TYPE_WRITE_FINISH);
	return ret;
}

static void
coda_vm_open(struct vm_area_struct *vma)
{
	struct coda_vm_ops *cvm_ops =
		container_of(vma->vm_ops, struct coda_vm_ops, vm_ops);

	refcount_inc(&cvm_ops->refcnt);

	if (cvm_ops->host_vm_ops && cvm_ops->host_vm_ops->open)
		cvm_ops->host_vm_ops->open(vma);
}

static void
coda_vm_close(struct vm_area_struct *vma)
{
	struct coda_vm_ops *cvm_ops =
		container_of(vma->vm_ops, struct coda_vm_ops, vm_ops);

	if (cvm_ops->host_vm_ops && cvm_ops->host_vm_ops->close)
		cvm_ops->host_vm_ops->close(vma);

	if (refcount_dec_and_test(&cvm_ops->refcnt)) {
		vma->vm_ops = cvm_ops->host_vm_ops;
		fput(cvm_ops->coda_file);
		kfree(cvm_ops);
	}
}

static int
coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma)
{
	struct inode *coda_inode = file_inode(coda_file);
	struct coda_file_info *cfi = coda_ftoc(coda_file);
	struct file *host_file = cfi->cfi_container;
	struct inode *host_inode = file_inode(host_file);
	struct coda_inode_info *cii;
	struct coda_vm_ops *cvm_ops;
	loff_t ppos;
	size_t count;
	int ret;

	if (!host_file->f_op->mmap)
		return -ENODEV;

	if (WARN_ON(coda_file != vma->vm_file))
		return -EIO;

	count = vma->vm_end - vma->vm_start;
	ppos = vma->vm_pgoff * PAGE_SIZE;

	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
				  &cfi->cfi_access_intent,
				  count, ppos, CODA_ACCESS_TYPE_MMAP);
	if (ret)
		return ret;

	cvm_ops = kmalloc(sizeof(struct coda_vm_ops), GFP_KERNEL);
	if (!cvm_ops)
		return -ENOMEM;

	cii = ITOC(coda_inode);
	spin_lock(&cii->c_lock);
	coda_file->f_mapping = host_file->f_mapping;
	if (coda_inode->i_mapping == &coda_inode->i_data)
		coda_inode->i_mapping = host_inode->i_mapping;

	/* only allow additional mmaps as long as userspace isn't changing
	 * the container file on us! */
	else if (coda_inode->i_mapping != host_inode->i_mapping) {
		spin_unlock(&cii->c_lock);
		kfree(cvm_ops);
		return -EBUSY;
	}

	/* keep track of how often the coda_inode/host_file has been mmapped */
	cii->c_mapcount++;
	cfi->cfi_mapcount++;
	spin_unlock(&cii->c_lock);

	vma->vm_file = get_file(host_file);
	ret = call_mmap(vma->vm_file, vma);

	if (ret) {
		/* if call_mmap fails, our caller will put host_file so we
		 * should drop the reference to the coda_file that we got.
		 */
		fput(coda_file);
		kfree(cvm_ops);
	} else {
		/* here we add redirects for the open/close vm_operations */
		cvm_ops->host_vm_ops = vma->vm_ops;
		if (vma->vm_ops)
			cvm_ops->vm_ops = *vma->vm_ops;

		cvm_ops->vm_ops.open = coda_vm_open;
		cvm_ops->vm_ops.close = coda_vm_close;
		cvm_ops->coda_file = coda_file;
		refcount_set(&cvm_ops->refcnt, 1);

		vma->vm_ops = &cvm_ops->vm_ops;
	}
	return ret;
}

int coda_open(struct inode *coda_inode, struct file *coda_file)
{
	struct file *host_file = NULL;
	int error;
	unsigned short flags = coda_file->f_flags & (~O_EXCL);
	unsigned short coda_flags = coda_flags_to_cflags(flags);
	struct coda_file_info *cfi;

	cfi = kmalloc(sizeof(struct coda_file_info), GFP_KERNEL);
	if (!cfi)
		return -ENOMEM;

	error = venus_open(coda_inode->i_sb, coda_i2f(coda_inode), coda_flags,
			   &host_file);
	if (!host_file)
		error = -EIO;

	if (error) {
		kfree(cfi);
		return error;
	}

	host_file->f_flags |= coda_file->f_flags & (O_APPEND | O_SYNC);

	cfi->cfi_magic = CODA_MAGIC;
	cfi->cfi_mapcount = 0;
	cfi->cfi_container = host_file;
	/* assume access intents are supported unless we hear otherwise */
	cfi->cfi_access_intent = true;

	BUG_ON(coda_file->private_data != NULL);
	coda_file->private_data = cfi;
	return 0;
}

int coda_release(struct inode *coda_inode, struct file *coda_file)
{
	unsigned short flags = (coda_file->f_flags) & (~O_EXCL);
	unsigned short coda_flags = coda_flags_to_cflags(flags);
	struct coda_file_info *cfi;
	struct coda_inode_info *cii;
	struct inode *host_inode;

	cfi = coda_ftoc(coda_file);

	venus_close(coda_inode->i_sb, coda_i2f(coda_inode),
			  coda_flags, coda_file->f_cred->fsuid);

	host_inode = file_inode(cfi->cfi_container);
	cii = ITOC(coda_inode);

	/* did we mmap this file? */
	spin_lock(&cii->c_lock);
	if (coda_inode->i_mapping == &host_inode->i_data) {
		cii->c_mapcount -= cfi->cfi_mapcount;
		if (!cii->c_mapcount)
			coda_inode->i_mapping = &coda_inode->i_data;
	}
	spin_unlock(&cii->c_lock);

	fput(cfi->cfi_container);
	kfree(coda_file->private_data);
	coda_file->private_data = NULL;

	/* VFS fput ignores the return value from file_operations->release, so
	 * there is no use returning an error here */
	return 0;
}

int coda_fsync(struct file *coda_file, loff_t start, loff_t end, int datasync)
{
	struct file *host_file;
	struct inode *coda_inode = file_inode(coda_file);
	struct coda_file_info *cfi;
	int err;

	if (!(S_ISREG(coda_inode->i_mode) || S_ISDIR(coda_inode->i_mode) ||
	      S_ISLNK(coda_inode->i_mode)))
		return -EINVAL;

	err = filemap_write_and_wait_range(coda_inode->i_mapping, start, end);
	if (err)
		return err;
	inode_lock(coda_inode);

	cfi = coda_ftoc(coda_file);
	host_file = cfi->cfi_container;

	err = vfs_fsync(host_file, datasync);
	if (!err && !datasync)
		err = venus_fsync(coda_inode->i_sb, coda_i2f(coda_inode));
	inode_unlock(coda_inode);

	return err;
}

const struct file_operations coda_file_operations = {
	.llseek		= generic_file_llseek,
	.read_iter	= coda_file_read_iter,
	.write_iter	= coda_file_write_iter,
	.mmap		= coda_file_mmap,
	.open		= coda_open,
	.release	= coda_release,
	.fsync		= coda_fsync,
	.splice_read	= generic_file_splice_read,
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* File operations for Coda.
	4	* Original version: (C) 1996 Peter Braam
	5	* Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
	6	*
	7	* Carnegie Mellon encourages users of this code to contribute improvements
	8	* to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
	9	*/
	10
1077c285	11	#include <linux/refcount.h>
1da177e4 LT	12	#include <linux/types.h>
	13	#include <linux/kernel.h>
	14	#include <linux/time.h>
	15	#include <linux/file.h>
	16	#include <linux/fs.h>
cbcc268b	17	#include <linux/pagemap.h>
1da177e4	18	#include <linux/stat.h>
7596b27d	19	#include <linux/cred.h>
1da177e4	20	#include <linux/errno.h>
b5ce1d83	21	#include <linux/spinlock.h>
1da177e4	22	#include <linux/string.h>
5a0e3ad6	23	#include <linux/slab.h>
834b46c3	24	#include <linux/uaccess.h>
a9fba24c	25	#include <linux/uio.h>
1da177e4 LT	26
1da177e4 LT	27	#include <linux/coda.h>
8fc8b9df	28	#include "coda_psdev.h"
31a203df	29	#include "coda_linux.h"
c98d8cfb AB	30	#include "coda_int.h"
c98d8cfb AB	31
7fa0a1da	32	struct coda_vm_ops {
1077c285	33	refcount_t refcnt;
7fa0a1da JH	34	struct file *coda_file;
	35	const struct vm_operations_struct *host_vm_ops;
	36	struct vm_operations_struct vm_ops;
	37	};
	38
1da177e4	39	static ssize_t
c12c49e7	40	coda_file_read_iter(struct kiocb iocb, struct iov_iter to)
1da177e4	41	{
c12c49e7	42	struct file *coda_file = iocb->ki_filp;
a9fba24c	43	struct inode *coda_inode = file_inode(coda_file);
5bb44810	44	struct coda_file_info *cfi = coda_ftoc(coda_file);
a9fba24c PC	45	loff_t ki_pos = iocb->ki_pos;
	46	size_t count = iov_iter_count(to);
	47	ssize_t ret;
	48
	49	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	50	&cfi->cfi_access_intent,
	51	count, ki_pos, CODA_ACCESS_TYPE_READ);
	52	if (ret)
	53	goto finish_read;
	54
	55	ret = vfs_iter_read(cfi->cfi_container, to, &iocb->ki_pos, 0);
1da177e4	56
a9fba24c PC	57	finish_read:
	58	venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	59	&cfi->cfi_access_intent,
	60	count, ki_pos, CODA_ACCESS_TYPE_READ_FINISH);
	61	return ret;
1da177e4 LT	62	}
1da177e4 LT	63
1da177e4	64	static ssize_t
c12c49e7	65	coda_file_write_iter(struct kiocb iocb, struct iov_iter to)
1da177e4	66	{
c12c49e7 AV	67	struct file *coda_file = iocb->ki_filp;
c12c49e7 AV	68	struct inode *coda_inode = file_inode(coda_file);
5bb44810	69	struct coda_file_info *cfi = coda_ftoc(coda_file);
a9fba24c PC	70	struct file *host_file = cfi->cfi_container;
	71	loff_t ki_pos = iocb->ki_pos;
	72	size_t count = iov_iter_count(to);
1da177e4 LT	73	ssize_t ret;
1da177e4 LT	74
a9fba24c PC	75	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	76	&cfi->cfi_access_intent,
	77	count, ki_pos, CODA_ACCESS_TYPE_WRITE);
	78	if (ret)
	79	goto finish_write;
	80
03d95eb2	81	file_start_write(host_file);
5955102c	82	inode_lock(coda_inode);
abbb6589	83	ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos, 0);
c12c49e7	84	coda_inode->i_size = file_inode(host_file)->i_size;
1da177e4	85	coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
02027d42	86	coda_inode->i_mtime = coda_inode->i_ctime = current_time(coda_inode);
5955102c	87	inode_unlock(coda_inode);
03d95eb2	88	file_end_write(host_file);
a9fba24c PC	89
	90	finish_write:
	91	venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	92	&cfi->cfi_access_intent,
	93	count, ki_pos, CODA_ACCESS_TYPE_WRITE_FINISH);
1da177e4 LT	94	return ret;
	95	}
	96
7fa0a1da JH	97	static void
	98	coda_vm_open(struct vm_area_struct *vma)
	99	{
	100	struct coda_vm_ops *cvm_ops =
	101	container_of(vma->vm_ops, struct coda_vm_ops, vm_ops);
	102
1077c285	103	refcount_inc(&cvm_ops->refcnt);
7fa0a1da JH	104
	105	if (cvm_ops->host_vm_ops && cvm_ops->host_vm_ops->open)
	106	cvm_ops->host_vm_ops->open(vma);
	107	}
	108
	109	static void
	110	coda_vm_close(struct vm_area_struct *vma)
	111	{
	112	struct coda_vm_ops *cvm_ops =
	113	container_of(vma->vm_ops, struct coda_vm_ops, vm_ops);
	114
	115	if (cvm_ops->host_vm_ops && cvm_ops->host_vm_ops->close)
	116	cvm_ops->host_vm_ops->close(vma);
	117
1077c285	118	if (refcount_dec_and_test(&cvm_ops->refcnt)) {
7fa0a1da JH	119	vma->vm_ops = cvm_ops->host_vm_ops;
	120	fput(cvm_ops->coda_file);
	121	kfree(cvm_ops);
	122	}
	123	}
	124
1da177e4 LT	125	static int
	126	coda_file_mmap(struct file coda_file, struct vm_area_struct vma)
	127	{
a9fba24c PC	128	struct inode *coda_inode = file_inode(coda_file);
	129	struct coda_file_info *cfi = coda_ftoc(coda_file);
	130	struct file *host_file = cfi->cfi_container;
	131	struct inode *host_inode = file_inode(host_file);
1da177e4	132	struct coda_inode_info *cii;
7fa0a1da	133	struct coda_vm_ops *cvm_ops;
a9fba24c PC	134	loff_t ppos;
a9fba24c PC	135	size_t count;
7fa0a1da	136	int ret;
1da177e4	137
72c2d531	138	if (!host_file->f_op->mmap)
1da177e4 LT	139	return -ENODEV;
1da177e4 LT	140
7fa0a1da JH	141	if (WARN_ON(coda_file != vma->vm_file))
	142	return -EIO;
	143
a9fba24c PC	144	count = vma->vm_end - vma->vm_start;
	145	ppos = vma->vm_pgoff * PAGE_SIZE;
	146
	147	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	148	&cfi->cfi_access_intent,
	149	count, ppos, CODA_ACCESS_TYPE_MMAP);
	150	if (ret)
	151	return ret;
	152
7fa0a1da JH	153	cvm_ops = kmalloc(sizeof(struct coda_vm_ops), GFP_KERNEL);
	154	if (!cvm_ops)
	155	return -ENOMEM;
	156
b5ce1d83 YA	157	cii = ITOC(coda_inode);
b5ce1d83 YA	158	spin_lock(&cii->c_lock);
1da177e4 LT	159	coda_file->f_mapping = host_file->f_mapping;
	160	if (coda_inode->i_mapping == &coda_inode->i_data)
	161	coda_inode->i_mapping = host_inode->i_mapping;
	162
	163	/* only allow additional mmaps as long as userspace isn't changing
	164	* the container file on us! */
b5ce1d83 YA	165	else if (coda_inode->i_mapping != host_inode->i_mapping) {
b5ce1d83 YA	166	spin_unlock(&cii->c_lock);
7fa0a1da	167	kfree(cvm_ops);
1da177e4	168	return -EBUSY;
b5ce1d83	169	}
1da177e4 LT	170
1da177e4 LT	171	/* keep track of how often the coda_inode/host_file has been mmapped */
1da177e4 LT	172	cii->c_mapcount++;
1da177e4 LT	173	cfi->cfi_mapcount++;
b5ce1d83	174	spin_unlock(&cii->c_lock);
1da177e4	175
7fa0a1da JH	176	vma->vm_file = get_file(host_file);
	177	ret = call_mmap(vma->vm_file, vma);
	178
	179	if (ret) {
9da29c7f CK	180	/* if call_mmap fails, our caller will put host_file so we
9da29c7f CK	181	* should drop the reference to the coda_file that we got.
7fa0a1da	182	*/
9da29c7f	183	fput(coda_file);
7fa0a1da JH	184	kfree(cvm_ops);
	185	} else {
	186	/* here we add redirects for the open/close vm_operations */
	187	cvm_ops->host_vm_ops = vma->vm_ops;
	188	if (vma->vm_ops)
	189	cvm_ops->vm_ops = *vma->vm_ops;
	190
	191	cvm_ops->vm_ops.open = coda_vm_open;
	192	cvm_ops->vm_ops.close = coda_vm_close;
	193	cvm_ops->coda_file = coda_file;
1077c285	194	refcount_set(&cvm_ops->refcnt, 1);
7fa0a1da JH	195
	196	vma->vm_ops = &cvm_ops->vm_ops;
	197	}
	198	return ret;
1da177e4 LT	199	}
	200
	201	int coda_open(struct inode coda_inode, struct file coda_file)
	202	{
	203	struct file *host_file = NULL;
	204	int error;
	205	unsigned short flags = coda_file->f_flags & (~O_EXCL);
	206	unsigned short coda_flags = coda_flags_to_cflags(flags);
	207	struct coda_file_info *cfi;
	208
1da177e4	209	cfi = kmalloc(sizeof(struct coda_file_info), GFP_KERNEL);
6ecbc4e1	210	if (!cfi)
1da177e4	211	return -ENOMEM;
1da177e4	212
1da177e4	213	error = venus_open(coda_inode->i_sb, coda_i2f(coda_inode), coda_flags,
38c2e437 JH	214	&host_file);
	215	if (!host_file)
	216	error = -EIO;
	217
	218	if (error) {
1da177e4	219	kfree(cfi);
1da177e4 LT	220	return error;
	221	}
	222
	223	host_file->f_flags \|= coda_file->f_flags & (O_APPEND \| O_SYNC);
	224
	225	cfi->cfi_magic = CODA_MAGIC;
	226	cfi->cfi_mapcount = 0;
	227	cfi->cfi_container = host_file;
a9fba24c PC	228	/* assume access intents are supported unless we hear otherwise */
a9fba24c PC	229	cfi->cfi_access_intent = true;
1da177e4 LT	230
	231	BUG_ON(coda_file->private_data != NULL);
	232	coda_file->private_data = cfi;
1da177e4 LT	233	return 0;
	234	}
	235
1da177e4 LT	236	int coda_release(struct inode coda_inode, struct file coda_file)
	237	{
	238	unsigned short flags = (coda_file->f_flags) & (~O_EXCL);
	239	unsigned short coda_flags = coda_flags_to_cflags(flags);
	240	struct coda_file_info *cfi;
	241	struct coda_inode_info *cii;
	242	struct inode *host_inode;
3cf01f28	243
5bb44810	244	cfi = coda_ftoc(coda_file);
1da177e4	245
b1deb685	246	venus_close(coda_inode->i_sb, coda_i2f(coda_inode),
d76b0d9b	247	coda_flags, coda_file->f_cred->fsuid);
1da177e4	248
496ad9aa	249	host_inode = file_inode(cfi->cfi_container);
1da177e4 LT	250	cii = ITOC(coda_inode);
	251
	252	/* did we mmap this file? */
b5ce1d83	253	spin_lock(&cii->c_lock);
1da177e4 LT	254	if (coda_inode->i_mapping == &host_inode->i_data) {
	255	cii->c_mapcount -= cfi->cfi_mapcount;
	256	if (!cii->c_mapcount)
	257	coda_inode->i_mapping = &coda_inode->i_data;
	258	}
b5ce1d83	259	spin_unlock(&cii->c_lock);
1da177e4 LT	260
	261	fput(cfi->cfi_container);
	262	kfree(coda_file->private_data);
	263	coda_file->private_data = NULL;
	264
d3fec424 JH	265	/* VFS fput ignores the return value from file_operations->release, so
	266	* there is no use returning an error here */
	267	return 0;
1da177e4 LT	268	}
1da177e4 LT	269
02c24a82	270	int coda_fsync(struct file *coda_file, loff_t start, loff_t end, int datasync)
1da177e4 LT	271	{
1da177e4 LT	272	struct file *host_file;
496ad9aa	273	struct inode *coda_inode = file_inode(coda_file);
1da177e4	274	struct coda_file_info *cfi;
f7cc02b8	275	int err;
1da177e4 LT	276
	277	if (!(S_ISREG(coda_inode->i_mode) \|\| S_ISDIR(coda_inode->i_mode) \|\|
	278	S_ISLNK(coda_inode->i_mode)))
	279	return -EINVAL;
	280
02c24a82 JB	281	err = filemap_write_and_wait_range(coda_inode->i_mapping, start, end);
	282	if (err)
	283	return err;
5955102c	284	inode_lock(coda_inode);
02c24a82	285
5bb44810	286	cfi = coda_ftoc(coda_file);
1da177e4 LT	287	host_file = cfi->cfi_container;
1da177e4 LT	288
8018ab05	289	err = vfs_fsync(host_file, datasync);
f7cc02b8	290	if (!err && !datasync)
1da177e4	291	err = venus_fsync(coda_inode->i_sb, coda_i2f(coda_inode));
5955102c	292	inode_unlock(coda_inode);
1da177e4 LT	293
	294	return err;
	295	}
	296
4b6f5d20	297	const struct file_operations coda_file_operations = {
1da177e4	298	.llseek = generic_file_llseek,
c12c49e7 AV	299	.read_iter = coda_file_read_iter,
c12c49e7 AV	300	.write_iter = coda_file_write_iter,
1da177e4 LT	301	.mmap = coda_file_mmap,
1da177e4 LT	302	.open = coda_open,
1da177e4 LT	303	.release = coda_release,
1da177e4 LT	304	.fsync = coda_fsync,
82c156f8	305	.splice_read = generic_file_splice_read,
1da177e4	306	};