Contributors: 24
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jan Harkes |
553 |
33.99% |
7 |
10.45% |
| Linus Torvalds |
289 |
17.76% |
4 |
5.97% |
| Linus Torvalds (pre-git) |
255 |
15.67% |
24 |
35.82% |
| Pedro Cuadra |
245 |
15.06% |
1 |
1.49% |
| Al Viro |
101 |
6.21% |
5 |
7.46% |
| David Howells |
51 |
3.13% |
3 |
4.48% |
| Yoshihisa Abe |
45 |
2.77% |
1 |
1.49% |
| Josef Bacik |
19 |
1.17% |
1 |
1.49% |
| Christoph Hellwig |
10 |
0.61% |
4 |
5.97% |
| Paul Mundt |
9 |
0.55% |
1 |
1.49% |
| Andrew Morton |
8 |
0.49% |
1 |
1.49% |
| Xiyu Yang |
7 |
0.43% |
1 |
1.49% |
| Jan Kara |
6 |
0.37% |
1 |
1.49% |
| Fabian Frederick |
6 |
0.37% |
2 |
2.99% |
| Jeff Layton |
5 |
0.31% |
2 |
2.99% |
| Randy Dunlap |
3 |
0.18% |
1 |
1.49% |
| Matthew Wilcox |
3 |
0.18% |
1 |
1.49% |
| Adrian Bunk |
3 |
0.18% |
1 |
1.49% |
| Deepa Dinamani |
3 |
0.18% |
1 |
1.49% |
| Christian König |
2 |
0.12% |
1 |
1.49% |
| Arjan van de Ven |
1 |
0.06% |
1 |
1.49% |
| Jens Axboe |
1 |
0.06% |
1 |
1.49% |
| Dave Jones |
1 |
0.06% |
1 |
1.49% |
| Greg Kroah-Hartman |
1 |
0.06% |
1 |
1.49% |
| Total |
1627 |
|
67 |
|
// 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;
inode_set_mtime_to_ts(coda_inode, inode_set_ctime_current(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,
};