[linux.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;

	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;
	inode_set_mtime_to_ts(coda_inode, inode_set_ctime_current(coda_inode));
	inode_unlock(coda_inode);

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
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;
581a4d00	86	inode_set_mtime_to_ts(coda_inode, inode_set_ctime_current(coda_inode));
e389b76a	87	inode_unlock(coda_inode);
a9fba24c PC	88
	89	finish_write:
	90	venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	91	&cfi->cfi_access_intent,
	92	count, ki_pos, CODA_ACCESS_TYPE_WRITE_FINISH);
1da177e4 LT	93	return ret;
	94	}
	95
a1be2935 DH	96	static ssize_t
	97	coda_file_splice_read(struct file coda_file, loff_t ppos,
	98	struct pipe_inode_info *pipe,
	99	size_t len, unsigned int flags)
	100	{
	101	struct inode *coda_inode = file_inode(coda_file);
	102	struct coda_file_info *cfi = coda_ftoc(coda_file);
	103	struct file *in = cfi->cfi_container;
	104	loff_t ki_pos = *ppos;
	105	ssize_t ret;
	106
	107	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	108	&cfi->cfi_access_intent,
	109	len, ki_pos, CODA_ACCESS_TYPE_READ);
	110	if (ret)
	111	goto finish_read;
	112
	113	ret = vfs_splice_read(in, ppos, pipe, len, flags);
	114
	115	finish_read:
	116	venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	117	&cfi->cfi_access_intent,
	118	len, ki_pos, CODA_ACCESS_TYPE_READ_FINISH);
	119	return ret;
	120	}
	121
7fa0a1da JH	122	static void
	123	coda_vm_open(struct vm_area_struct *vma)
	124	{
	125	struct coda_vm_ops *cvm_ops =
	126	container_of(vma->vm_ops, struct coda_vm_ops, vm_ops);
	127
1077c285	128	refcount_inc(&cvm_ops->refcnt);
7fa0a1da JH	129
	130	if (cvm_ops->host_vm_ops && cvm_ops->host_vm_ops->open)
	131	cvm_ops->host_vm_ops->open(vma);
	132	}
	133
	134	static void
	135	coda_vm_close(struct vm_area_struct *vma)
	136	{
	137	struct coda_vm_ops *cvm_ops =
	138	container_of(vma->vm_ops, struct coda_vm_ops, vm_ops);
	139
	140	if (cvm_ops->host_vm_ops && cvm_ops->host_vm_ops->close)
	141	cvm_ops->host_vm_ops->close(vma);
	142
1077c285	143	if (refcount_dec_and_test(&cvm_ops->refcnt)) {
7fa0a1da JH	144	vma->vm_ops = cvm_ops->host_vm_ops;
	145	fput(cvm_ops->coda_file);
	146	kfree(cvm_ops);
	147	}
	148	}
	149
1da177e4 LT	150	static int
	151	coda_file_mmap(struct file coda_file, struct vm_area_struct vma)
	152	{
a9fba24c PC	153	struct inode *coda_inode = file_inode(coda_file);
	154	struct coda_file_info *cfi = coda_ftoc(coda_file);
	155	struct file *host_file = cfi->cfi_container;
	156	struct inode *host_inode = file_inode(host_file);
1da177e4	157	struct coda_inode_info *cii;
7fa0a1da	158	struct coda_vm_ops *cvm_ops;
a9fba24c PC	159	loff_t ppos;
a9fba24c PC	160	size_t count;
7fa0a1da	161	int ret;
1da177e4	162
72c2d531	163	if (!host_file->f_op->mmap)
1da177e4 LT	164	return -ENODEV;
1da177e4 LT	165
7fa0a1da JH	166	if (WARN_ON(coda_file != vma->vm_file))
	167	return -EIO;
	168
a9fba24c PC	169	count = vma->vm_end - vma->vm_start;
	170	ppos = vma->vm_pgoff * PAGE_SIZE;
	171
	172	ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
	173	&cfi->cfi_access_intent,
	174	count, ppos, CODA_ACCESS_TYPE_MMAP);
	175	if (ret)
	176	return ret;
	177
7fa0a1da JH	178	cvm_ops = kmalloc(sizeof(struct coda_vm_ops), GFP_KERNEL);
	179	if (!cvm_ops)
	180	return -ENOMEM;
	181
b5ce1d83 YA	182	cii = ITOC(coda_inode);
b5ce1d83 YA	183	spin_lock(&cii->c_lock);
1da177e4 LT	184	coda_file->f_mapping = host_file->f_mapping;
	185	if (coda_inode->i_mapping == &coda_inode->i_data)
	186	coda_inode->i_mapping = host_inode->i_mapping;
	187
	188	/* only allow additional mmaps as long as userspace isn't changing
	189	* the container file on us! */
b5ce1d83 YA	190	else if (coda_inode->i_mapping != host_inode->i_mapping) {
b5ce1d83 YA	191	spin_unlock(&cii->c_lock);
7fa0a1da	192	kfree(cvm_ops);
1da177e4	193	return -EBUSY;
b5ce1d83	194	}
1da177e4 LT	195
1da177e4 LT	196	/* keep track of how often the coda_inode/host_file has been mmapped */
1da177e4 LT	197	cii->c_mapcount++;
1da177e4 LT	198	cfi->cfi_mapcount++;
b5ce1d83	199	spin_unlock(&cii->c_lock);
1da177e4	200
7fa0a1da JH	201	vma->vm_file = get_file(host_file);
	202	ret = call_mmap(vma->vm_file, vma);
	203
	204	if (ret) {
9da29c7f CK	205	/* if call_mmap fails, our caller will put host_file so we
9da29c7f CK	206	* should drop the reference to the coda_file that we got.
7fa0a1da	207	*/
9da29c7f	208	fput(coda_file);
7fa0a1da JH	209	kfree(cvm_ops);
	210	} else {
	211	/* here we add redirects for the open/close vm_operations */
	212	cvm_ops->host_vm_ops = vma->vm_ops;
	213	if (vma->vm_ops)
	214	cvm_ops->vm_ops = *vma->vm_ops;
	215
	216	cvm_ops->vm_ops.open = coda_vm_open;
	217	cvm_ops->vm_ops.close = coda_vm_close;
	218	cvm_ops->coda_file = coda_file;
1077c285	219	refcount_set(&cvm_ops->refcnt, 1);
7fa0a1da JH	220
	221	vma->vm_ops = &cvm_ops->vm_ops;
	222	}
	223	return ret;
1da177e4 LT	224	}
	225
	226	int coda_open(struct inode coda_inode, struct file coda_file)
	227	{
	228	struct file *host_file = NULL;
	229	int error;
	230	unsigned short flags = coda_file->f_flags & (~O_EXCL);
	231	unsigned short coda_flags = coda_flags_to_cflags(flags);
	232	struct coda_file_info *cfi;
	233
1da177e4	234	cfi = kmalloc(sizeof(struct coda_file_info), GFP_KERNEL);
6ecbc4e1	235	if (!cfi)
1da177e4	236	return -ENOMEM;
1da177e4	237
1da177e4	238	error = venus_open(coda_inode->i_sb, coda_i2f(coda_inode), coda_flags,
38c2e437 JH	239	&host_file);
	240	if (!host_file)
	241	error = -EIO;
	242
	243	if (error) {
1da177e4	244	kfree(cfi);
1da177e4 LT	245	return error;
	246	}
	247
	248	host_file->f_flags \|= coda_file->f_flags & (O_APPEND \| O_SYNC);
	249
	250	cfi->cfi_magic = CODA_MAGIC;
	251	cfi->cfi_mapcount = 0;
	252	cfi->cfi_container = host_file;
a9fba24c PC	253	/* assume access intents are supported unless we hear otherwise */
a9fba24c PC	254	cfi->cfi_access_intent = true;
1da177e4 LT	255
	256	BUG_ON(coda_file->private_data != NULL);
	257	coda_file->private_data = cfi;
1da177e4 LT	258	return 0;
	259	}
	260
1da177e4 LT	261	int coda_release(struct inode coda_inode, struct file coda_file)
	262	{
	263	unsigned short flags = (coda_file->f_flags) & (~O_EXCL);
	264	unsigned short coda_flags = coda_flags_to_cflags(flags);
	265	struct coda_file_info *cfi;
	266	struct coda_inode_info *cii;
	267	struct inode *host_inode;
3cf01f28	268
5bb44810	269	cfi = coda_ftoc(coda_file);
1da177e4	270
b1deb685	271	venus_close(coda_inode->i_sb, coda_i2f(coda_inode),
d76b0d9b	272	coda_flags, coda_file->f_cred->fsuid);
1da177e4	273
496ad9aa	274	host_inode = file_inode(cfi->cfi_container);
1da177e4 LT	275	cii = ITOC(coda_inode);
	276
	277	/* did we mmap this file? */
b5ce1d83	278	spin_lock(&cii->c_lock);
1da177e4 LT	279	if (coda_inode->i_mapping == &host_inode->i_data) {
	280	cii->c_mapcount -= cfi->cfi_mapcount;
	281	if (!cii->c_mapcount)
	282	coda_inode->i_mapping = &coda_inode->i_data;
	283	}
b5ce1d83	284	spin_unlock(&cii->c_lock);
1da177e4 LT	285
	286	fput(cfi->cfi_container);
	287	kfree(coda_file->private_data);
	288	coda_file->private_data = NULL;
	289
d3fec424 JH	290	/* VFS fput ignores the return value from file_operations->release, so
	291	* there is no use returning an error here */
	292	return 0;
1da177e4 LT	293	}
1da177e4 LT	294
02c24a82	295	int coda_fsync(struct file *coda_file, loff_t start, loff_t end, int datasync)
1da177e4 LT	296	{
1da177e4 LT	297	struct file *host_file;
496ad9aa	298	struct inode *coda_inode = file_inode(coda_file);
1da177e4	299	struct coda_file_info *cfi;
f7cc02b8	300	int err;
1da177e4 LT	301
	302	if (!(S_ISREG(coda_inode->i_mode) \|\| S_ISDIR(coda_inode->i_mode) \|\|
	303	S_ISLNK(coda_inode->i_mode)))
	304	return -EINVAL;
	305
02c24a82 JB	306	err = filemap_write_and_wait_range(coda_inode->i_mapping, start, end);
	307	if (err)
	308	return err;
5955102c	309	inode_lock(coda_inode);
02c24a82	310
5bb44810	311	cfi = coda_ftoc(coda_file);
1da177e4 LT	312	host_file = cfi->cfi_container;
1da177e4 LT	313
8018ab05	314	err = vfs_fsync(host_file, datasync);
f7cc02b8	315	if (!err && !datasync)
1da177e4	316	err = venus_fsync(coda_inode->i_sb, coda_i2f(coda_inode));
5955102c	317	inode_unlock(coda_inode);
1da177e4 LT	318
	319	return err;
	320	}
	321
4b6f5d20	322	const struct file_operations coda_file_operations = {
1da177e4	323	.llseek = generic_file_llseek,
c12c49e7 AV	324	.read_iter = coda_file_read_iter,
c12c49e7 AV	325	.write_iter = coda_file_write_iter,
1da177e4 LT	326	.mmap = coda_file_mmap,
1da177e4 LT	327	.open = coda_open,
1da177e4 LT	328	.release = coda_release,
1da177e4 LT	329	.fsync = coda_fsync,
a1be2935	330	.splice_read = coda_file_splice_read,
1da177e4	331	};