[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/splice.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 ssize_t
coda_file_splice_read(struct file *coda_file, loff_t *ppos,
		      struct pipe_inode_info *pipe,
		      size_t len, unsigned int flags)
{
	struct inode *coda_inode = file_inode(coda_file);
	struct coda_file_info *cfi = coda_ftoc(coda_file);
	struct file *in = cfi->cfi_container;
	loff_t ki_pos = *ppos;
	ssize_t ret;

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

	ret = vfs_splice_read(in, ppos, pipe, len, flags);

finish_read:
	venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
			    &cfi->cfi_access_intent,
			    len, ki_pos, CODA_ACCESS_TYPE_READ_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	= coda_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>
a1be2935	26	#include <linux/splice.h>
1da177e4 LT	27
1da177e4 LT	28	#include <linux/coda.h>
8fc8b9df	29	#include "coda_psdev.h"
31a203df	30	#include "coda_linux.h"
c98d8cfb AB	31	#include "coda_int.h"
c98d8cfb AB	32
7fa0a1da	33	struct coda_vm_ops {
1077c285	34	refcount_t refcnt;
7fa0a1da JH	35	struct file *coda_file;
	36	const struct vm_operations_struct *host_vm_ops;
	37	struct vm_operations_struct vm_ops;
	38	};
	39
1da177e4	40	static ssize_t
c12c49e7	41	coda_file_read_iter(struct kiocb iocb, struct iov_iter to)
1da177e4	42	{
c12c49e7	43	struct file *coda_file = iocb->ki_filp;
a9fba24c	44	struct inode *coda_inode = file_inode(coda_file);
5bb44810	45	struct coda_file_info *cfi = coda_ftoc(coda_file);
a9fba24c PC	46	loff_t ki_pos = iocb->ki_pos;
	47	size_t count = iov_iter_count(to);
	48	ssize_t ret;
	49
	50	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	51	&cfi->cfi_access_intent,
	52	count, ki_pos, CODA_ACCESS_TYPE_READ);
	53	if (ret)
	54	goto finish_read;
	55
	56	ret = vfs_iter_read(cfi->cfi_container, to, &iocb->ki_pos, 0);
1da177e4	57
a9fba24c PC	58	finish_read:
	59	venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	60	&cfi->cfi_access_intent,
	61	count, ki_pos, CODA_ACCESS_TYPE_READ_FINISH);
	62	return ret;
1da177e4 LT	63	}
1da177e4 LT	64
1da177e4	65	static ssize_t
c12c49e7	66	coda_file_write_iter(struct kiocb iocb, struct iov_iter to)
1da177e4	67	{
c12c49e7 AV	68	struct file *coda_file = iocb->ki_filp;
c12c49e7 AV	69	struct inode *coda_inode = file_inode(coda_file);
5bb44810	70	struct coda_file_info *cfi = coda_ftoc(coda_file);
a9fba24c PC	71	struct file *host_file = cfi->cfi_container;
	72	loff_t ki_pos = iocb->ki_pos;
	73	size_t count = iov_iter_count(to);
1da177e4 LT	74	ssize_t ret;
1da177e4 LT	75
a9fba24c PC	76	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	77	&cfi->cfi_access_intent,
	78	count, ki_pos, CODA_ACCESS_TYPE_WRITE);
	79	if (ret)
	80	goto finish_write;
	81
03d95eb2	82	file_start_write(host_file);
5955102c	83	inode_lock(coda_inode);
abbb6589	84	ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos, 0);
c12c49e7	85	coda_inode->i_size = file_inode(host_file)->i_size;
1da177e4	86	coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
02027d42	87	coda_inode->i_mtime = coda_inode->i_ctime = current_time(coda_inode);
5955102c	88	inode_unlock(coda_inode);
03d95eb2	89	file_end_write(host_file);
a9fba24c PC	90
	91	finish_write:
	92	venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	93	&cfi->cfi_access_intent,
	94	count, ki_pos, CODA_ACCESS_TYPE_WRITE_FINISH);
1da177e4 LT	95	return ret;
	96	}
	97
a1be2935 DH	98	static ssize_t
	99	coda_file_splice_read(struct file coda_file, loff_t ppos,
	100	struct pipe_inode_info *pipe,
	101	size_t len, unsigned int flags)
	102	{
	103	struct inode *coda_inode = file_inode(coda_file);
	104	struct coda_file_info *cfi = coda_ftoc(coda_file);
	105	struct file *in = cfi->cfi_container;
	106	loff_t ki_pos = *ppos;
	107	ssize_t ret;
	108
	109	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	110	&cfi->cfi_access_intent,
	111	len, ki_pos, CODA_ACCESS_TYPE_READ);
	112	if (ret)
	113	goto finish_read;
	114
	115	ret = vfs_splice_read(in, ppos, pipe, len, flags);
	116
	117	finish_read:
	118	venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	119	&cfi->cfi_access_intent,
	120	len, ki_pos, CODA_ACCESS_TYPE_READ_FINISH);
	121	return ret;
	122	}
	123
7fa0a1da JH	124	static void
	125	coda_vm_open(struct vm_area_struct *vma)
	126	{
	127	struct coda_vm_ops *cvm_ops =
	128	container_of(vma->vm_ops, struct coda_vm_ops, vm_ops);
	129
1077c285	130	refcount_inc(&cvm_ops->refcnt);
7fa0a1da JH	131
	132	if (cvm_ops->host_vm_ops && cvm_ops->host_vm_ops->open)
	133	cvm_ops->host_vm_ops->open(vma);
	134	}
	135
	136	static void
	137	coda_vm_close(struct vm_area_struct *vma)
	138	{
	139	struct coda_vm_ops *cvm_ops =
	140	container_of(vma->vm_ops, struct coda_vm_ops, vm_ops);
	141
	142	if (cvm_ops->host_vm_ops && cvm_ops->host_vm_ops->close)
	143	cvm_ops->host_vm_ops->close(vma);
	144
1077c285	145	if (refcount_dec_and_test(&cvm_ops->refcnt)) {
7fa0a1da JH	146	vma->vm_ops = cvm_ops->host_vm_ops;
	147	fput(cvm_ops->coda_file);
	148	kfree(cvm_ops);
	149	}
	150	}
	151
1da177e4 LT	152	static int
	153	coda_file_mmap(struct file coda_file, struct vm_area_struct vma)
	154	{
a9fba24c PC	155	struct inode *coda_inode = file_inode(coda_file);
	156	struct coda_file_info *cfi = coda_ftoc(coda_file);
	157	struct file *host_file = cfi->cfi_container;
	158	struct inode *host_inode = file_inode(host_file);
1da177e4	159	struct coda_inode_info *cii;
7fa0a1da	160	struct coda_vm_ops *cvm_ops;
a9fba24c PC	161	loff_t ppos;
a9fba24c PC	162	size_t count;
7fa0a1da	163	int ret;
1da177e4	164
72c2d531	165	if (!host_file->f_op->mmap)
1da177e4 LT	166	return -ENODEV;
1da177e4 LT	167
7fa0a1da JH	168	if (WARN_ON(coda_file != vma->vm_file))
	169	return -EIO;
	170
a9fba24c PC	171	count = vma->vm_end - vma->vm_start;
	172	ppos = vma->vm_pgoff * PAGE_SIZE;
	173
	174	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	175	&cfi->cfi_access_intent,
	176	count, ppos, CODA_ACCESS_TYPE_MMAP);
	177	if (ret)
	178	return ret;
	179
7fa0a1da JH	180	cvm_ops = kmalloc(sizeof(struct coda_vm_ops), GFP_KERNEL);
	181	if (!cvm_ops)
	182	return -ENOMEM;
	183
b5ce1d83 YA	184	cii = ITOC(coda_inode);
b5ce1d83 YA	185	spin_lock(&cii->c_lock);
1da177e4 LT	186	coda_file->f_mapping = host_file->f_mapping;
	187	if (coda_inode->i_mapping == &coda_inode->i_data)
	188	coda_inode->i_mapping = host_inode->i_mapping;
	189
	190	/* only allow additional mmaps as long as userspace isn't changing
	191	* the container file on us! */
b5ce1d83 YA	192	else if (coda_inode->i_mapping != host_inode->i_mapping) {
b5ce1d83 YA	193	spin_unlock(&cii->c_lock);
7fa0a1da	194	kfree(cvm_ops);
1da177e4	195	return -EBUSY;
b5ce1d83	196	}
1da177e4 LT	197
1da177e4 LT	198	/* keep track of how often the coda_inode/host_file has been mmapped */
1da177e4 LT	199	cii->c_mapcount++;
1da177e4 LT	200	cfi->cfi_mapcount++;
b5ce1d83	201	spin_unlock(&cii->c_lock);
1da177e4	202
7fa0a1da JH	203	vma->vm_file = get_file(host_file);
	204	ret = call_mmap(vma->vm_file, vma);
	205
	206	if (ret) {
9da29c7f CK	207	/* if call_mmap fails, our caller will put host_file so we
9da29c7f CK	208	* should drop the reference to the coda_file that we got.
7fa0a1da	209	*/
9da29c7f	210	fput(coda_file);
7fa0a1da JH	211	kfree(cvm_ops);
	212	} else {
	213	/* here we add redirects for the open/close vm_operations */
	214	cvm_ops->host_vm_ops = vma->vm_ops;
	215	if (vma->vm_ops)
	216	cvm_ops->vm_ops = *vma->vm_ops;
	217
	218	cvm_ops->vm_ops.open = coda_vm_open;
	219	cvm_ops->vm_ops.close = coda_vm_close;
	220	cvm_ops->coda_file = coda_file;
1077c285	221	refcount_set(&cvm_ops->refcnt, 1);
7fa0a1da JH	222
	223	vma->vm_ops = &cvm_ops->vm_ops;
	224	}
	225	return ret;
1da177e4 LT	226	}
	227
	228	int coda_open(struct inode coda_inode, struct file coda_file)
	229	{
	230	struct file *host_file = NULL;
	231	int error;
	232	unsigned short flags = coda_file->f_flags & (~O_EXCL);
	233	unsigned short coda_flags = coda_flags_to_cflags(flags);
	234	struct coda_file_info *cfi;
	235
1da177e4	236	cfi = kmalloc(sizeof(struct coda_file_info), GFP_KERNEL);
6ecbc4e1	237	if (!cfi)
1da177e4	238	return -ENOMEM;
1da177e4	239
1da177e4	240	error = venus_open(coda_inode->i_sb, coda_i2f(coda_inode), coda_flags,
38c2e437 JH	241	&host_file);
	242	if (!host_file)
	243	error = -EIO;
	244
	245	if (error) {
1da177e4	246	kfree(cfi);
1da177e4 LT	247	return error;
	248	}
	249
	250	host_file->f_flags \|= coda_file->f_flags & (O_APPEND \| O_SYNC);
	251
	252	cfi->cfi_magic = CODA_MAGIC;
	253	cfi->cfi_mapcount = 0;
	254	cfi->cfi_container = host_file;
a9fba24c PC	255	/* assume access intents are supported unless we hear otherwise */
a9fba24c PC	256	cfi->cfi_access_intent = true;
1da177e4 LT	257
	258	BUG_ON(coda_file->private_data != NULL);
	259	coda_file->private_data = cfi;
1da177e4 LT	260	return 0;
	261	}
	262
1da177e4 LT	263	int coda_release(struct inode coda_inode, struct file coda_file)
	264	{
	265	unsigned short flags = (coda_file->f_flags) & (~O_EXCL);
	266	unsigned short coda_flags = coda_flags_to_cflags(flags);
	267	struct coda_file_info *cfi;
	268	struct coda_inode_info *cii;
	269	struct inode *host_inode;
3cf01f28	270
5bb44810	271	cfi = coda_ftoc(coda_file);
1da177e4	272
b1deb685	273	venus_close(coda_inode->i_sb, coda_i2f(coda_inode),
d76b0d9b	274	coda_flags, coda_file->f_cred->fsuid);
1da177e4	275
496ad9aa	276	host_inode = file_inode(cfi->cfi_container);
1da177e4 LT	277	cii = ITOC(coda_inode);
	278
	279	/* did we mmap this file? */
b5ce1d83	280	spin_lock(&cii->c_lock);
1da177e4 LT	281	if (coda_inode->i_mapping == &host_inode->i_data) {
	282	cii->c_mapcount -= cfi->cfi_mapcount;
	283	if (!cii->c_mapcount)
	284	coda_inode->i_mapping = &coda_inode->i_data;
	285	}
b5ce1d83	286	spin_unlock(&cii->c_lock);
1da177e4 LT	287
	288	fput(cfi->cfi_container);
	289	kfree(coda_file->private_data);
	290	coda_file->private_data = NULL;
	291
d3fec424 JH	292	/* VFS fput ignores the return value from file_operations->release, so
	293	* there is no use returning an error here */
	294	return 0;
1da177e4 LT	295	}
1da177e4 LT	296
02c24a82	297	int coda_fsync(struct file *coda_file, loff_t start, loff_t end, int datasync)
1da177e4 LT	298	{
1da177e4 LT	299	struct file *host_file;
496ad9aa	300	struct inode *coda_inode = file_inode(coda_file);
1da177e4	301	struct coda_file_info *cfi;
f7cc02b8	302	int err;
1da177e4 LT	303
	304	if (!(S_ISREG(coda_inode->i_mode) \|\| S_ISDIR(coda_inode->i_mode) \|\|
	305	S_ISLNK(coda_inode->i_mode)))
	306	return -EINVAL;
	307
02c24a82 JB	308	err = filemap_write_and_wait_range(coda_inode->i_mapping, start, end);
	309	if (err)
	310	return err;
5955102c	311	inode_lock(coda_inode);
02c24a82	312
5bb44810	313	cfi = coda_ftoc(coda_file);
1da177e4 LT	314	host_file = cfi->cfi_container;
1da177e4 LT	315
8018ab05	316	err = vfs_fsync(host_file, datasync);
f7cc02b8	317	if (!err && !datasync)
1da177e4	318	err = venus_fsync(coda_inode->i_sb, coda_i2f(coda_inode));
5955102c	319	inode_unlock(coda_inode);
1da177e4 LT	320
	321	return err;
	322	}
	323
4b6f5d20	324	const struct file_operations coda_file_operations = {
1da177e4	325	.llseek = generic_file_llseek,
c12c49e7 AV	326	.read_iter = coda_file_read_iter,
c12c49e7 AV	327	.write_iter = coda_file_write_iter,
1da177e4 LT	328	.mmap = coda_file_mmap,
1da177e4 LT	329	.open = coda_open,
1da177e4 LT	330	.release = coda_release,
1da177e4 LT	331	.fsync = coda_fsync,
a1be2935	332	.splice_read = coda_file_splice_read,
1da177e4	333	};