mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 15:26:42 +07:00
1b1dcc1b57
This patch converts the inode semaphore to a mutex. I have tested it on XFS and compiled as much as one can consider on an ia64. Anyway your luck with it might be different. Modified-by: Ingo Molnar <mingo@elte.hu> (finished the conversion) Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
769 lines
16 KiB
C
769 lines
16 KiB
C
/*
|
|
* linux/fs/read_write.c
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/file.h>
|
|
#include <linux/uio.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/fsnotify.h>
|
|
#include <linux/security.h>
|
|
#include <linux/module.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/pagemap.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/unistd.h>
|
|
|
|
struct file_operations generic_ro_fops = {
|
|
.llseek = generic_file_llseek,
|
|
.read = generic_file_read,
|
|
.mmap = generic_file_readonly_mmap,
|
|
.sendfile = generic_file_sendfile,
|
|
};
|
|
|
|
EXPORT_SYMBOL(generic_ro_fops);
|
|
|
|
loff_t generic_file_llseek(struct file *file, loff_t offset, int origin)
|
|
{
|
|
long long retval;
|
|
struct inode *inode = file->f_mapping->host;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
switch (origin) {
|
|
case 2:
|
|
offset += inode->i_size;
|
|
break;
|
|
case 1:
|
|
offset += file->f_pos;
|
|
}
|
|
retval = -EINVAL;
|
|
if (offset>=0 && offset<=inode->i_sb->s_maxbytes) {
|
|
if (offset != file->f_pos) {
|
|
file->f_pos = offset;
|
|
file->f_version = 0;
|
|
}
|
|
retval = offset;
|
|
}
|
|
mutex_unlock(&inode->i_mutex);
|
|
return retval;
|
|
}
|
|
|
|
EXPORT_SYMBOL(generic_file_llseek);
|
|
|
|
loff_t remote_llseek(struct file *file, loff_t offset, int origin)
|
|
{
|
|
long long retval;
|
|
|
|
lock_kernel();
|
|
switch (origin) {
|
|
case 2:
|
|
offset += i_size_read(file->f_dentry->d_inode);
|
|
break;
|
|
case 1:
|
|
offset += file->f_pos;
|
|
}
|
|
retval = -EINVAL;
|
|
if (offset>=0 && offset<=file->f_dentry->d_inode->i_sb->s_maxbytes) {
|
|
if (offset != file->f_pos) {
|
|
file->f_pos = offset;
|
|
file->f_version = 0;
|
|
}
|
|
retval = offset;
|
|
}
|
|
unlock_kernel();
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL(remote_llseek);
|
|
|
|
loff_t no_llseek(struct file *file, loff_t offset, int origin)
|
|
{
|
|
return -ESPIPE;
|
|
}
|
|
EXPORT_SYMBOL(no_llseek);
|
|
|
|
loff_t default_llseek(struct file *file, loff_t offset, int origin)
|
|
{
|
|
long long retval;
|
|
|
|
lock_kernel();
|
|
switch (origin) {
|
|
case 2:
|
|
offset += i_size_read(file->f_dentry->d_inode);
|
|
break;
|
|
case 1:
|
|
offset += file->f_pos;
|
|
}
|
|
retval = -EINVAL;
|
|
if (offset >= 0) {
|
|
if (offset != file->f_pos) {
|
|
file->f_pos = offset;
|
|
file->f_version = 0;
|
|
}
|
|
retval = offset;
|
|
}
|
|
unlock_kernel();
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL(default_llseek);
|
|
|
|
loff_t vfs_llseek(struct file *file, loff_t offset, int origin)
|
|
{
|
|
loff_t (*fn)(struct file *, loff_t, int);
|
|
|
|
fn = no_llseek;
|
|
if (file->f_mode & FMODE_LSEEK) {
|
|
fn = default_llseek;
|
|
if (file->f_op && file->f_op->llseek)
|
|
fn = file->f_op->llseek;
|
|
}
|
|
return fn(file, offset, origin);
|
|
}
|
|
EXPORT_SYMBOL(vfs_llseek);
|
|
|
|
asmlinkage off_t sys_lseek(unsigned int fd, off_t offset, unsigned int origin)
|
|
{
|
|
off_t retval;
|
|
struct file * file;
|
|
int fput_needed;
|
|
|
|
retval = -EBADF;
|
|
file = fget_light(fd, &fput_needed);
|
|
if (!file)
|
|
goto bad;
|
|
|
|
retval = -EINVAL;
|
|
if (origin <= 2) {
|
|
loff_t res = vfs_llseek(file, offset, origin);
|
|
retval = res;
|
|
if (res != (loff_t)retval)
|
|
retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */
|
|
}
|
|
fput_light(file, fput_needed);
|
|
bad:
|
|
return retval;
|
|
}
|
|
|
|
#ifdef __ARCH_WANT_SYS_LLSEEK
|
|
asmlinkage long sys_llseek(unsigned int fd, unsigned long offset_high,
|
|
unsigned long offset_low, loff_t __user * result,
|
|
unsigned int origin)
|
|
{
|
|
int retval;
|
|
struct file * file;
|
|
loff_t offset;
|
|
int fput_needed;
|
|
|
|
retval = -EBADF;
|
|
file = fget_light(fd, &fput_needed);
|
|
if (!file)
|
|
goto bad;
|
|
|
|
retval = -EINVAL;
|
|
if (origin > 2)
|
|
goto out_putf;
|
|
|
|
offset = vfs_llseek(file, ((loff_t) offset_high << 32) | offset_low,
|
|
origin);
|
|
|
|
retval = (int)offset;
|
|
if (offset >= 0) {
|
|
retval = -EFAULT;
|
|
if (!copy_to_user(result, &offset, sizeof(offset)))
|
|
retval = 0;
|
|
}
|
|
out_putf:
|
|
fput_light(file, fput_needed);
|
|
bad:
|
|
return retval;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* rw_verify_area doesn't like huge counts. We limit
|
|
* them to something that fits in "int" so that others
|
|
* won't have to do range checks all the time.
|
|
*/
|
|
#define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
|
|
|
|
int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count)
|
|
{
|
|
struct inode *inode;
|
|
loff_t pos;
|
|
|
|
if (unlikely((ssize_t) count < 0))
|
|
goto Einval;
|
|
pos = *ppos;
|
|
if (unlikely((pos < 0) || (loff_t) (pos + count) < 0))
|
|
goto Einval;
|
|
|
|
inode = file->f_dentry->d_inode;
|
|
if (inode->i_flock && MANDATORY_LOCK(inode)) {
|
|
int retval = locks_mandatory_area(
|
|
read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE,
|
|
inode, file, pos, count);
|
|
if (retval < 0)
|
|
return retval;
|
|
}
|
|
return count > MAX_RW_COUNT ? MAX_RW_COUNT : count;
|
|
|
|
Einval:
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void wait_on_retry_sync_kiocb(struct kiocb *iocb)
|
|
{
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
if (!kiocbIsKicked(iocb))
|
|
schedule();
|
|
else
|
|
kiocbClearKicked(iocb);
|
|
__set_current_state(TASK_RUNNING);
|
|
}
|
|
|
|
ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
|
|
{
|
|
struct kiocb kiocb;
|
|
ssize_t ret;
|
|
|
|
init_sync_kiocb(&kiocb, filp);
|
|
kiocb.ki_pos = *ppos;
|
|
while (-EIOCBRETRY ==
|
|
(ret = filp->f_op->aio_read(&kiocb, buf, len, kiocb.ki_pos)))
|
|
wait_on_retry_sync_kiocb(&kiocb);
|
|
|
|
if (-EIOCBQUEUED == ret)
|
|
ret = wait_on_sync_kiocb(&kiocb);
|
|
*ppos = kiocb.ki_pos;
|
|
return ret;
|
|
}
|
|
|
|
EXPORT_SYMBOL(do_sync_read);
|
|
|
|
ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
|
|
{
|
|
ssize_t ret;
|
|
|
|
if (!(file->f_mode & FMODE_READ))
|
|
return -EBADF;
|
|
if (!file->f_op || (!file->f_op->read && !file->f_op->aio_read))
|
|
return -EINVAL;
|
|
if (unlikely(!access_ok(VERIFY_WRITE, buf, count)))
|
|
return -EFAULT;
|
|
|
|
ret = rw_verify_area(READ, file, pos, count);
|
|
if (ret >= 0) {
|
|
count = ret;
|
|
ret = security_file_permission (file, MAY_READ);
|
|
if (!ret) {
|
|
if (file->f_op->read)
|
|
ret = file->f_op->read(file, buf, count, pos);
|
|
else
|
|
ret = do_sync_read(file, buf, count, pos);
|
|
if (ret > 0) {
|
|
fsnotify_access(file->f_dentry);
|
|
current->rchar += ret;
|
|
}
|
|
current->syscr++;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
EXPORT_SYMBOL(vfs_read);
|
|
|
|
ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
|
|
{
|
|
struct kiocb kiocb;
|
|
ssize_t ret;
|
|
|
|
init_sync_kiocb(&kiocb, filp);
|
|
kiocb.ki_pos = *ppos;
|
|
while (-EIOCBRETRY ==
|
|
(ret = filp->f_op->aio_write(&kiocb, buf, len, kiocb.ki_pos)))
|
|
wait_on_retry_sync_kiocb(&kiocb);
|
|
|
|
if (-EIOCBQUEUED == ret)
|
|
ret = wait_on_sync_kiocb(&kiocb);
|
|
*ppos = kiocb.ki_pos;
|
|
return ret;
|
|
}
|
|
|
|
EXPORT_SYMBOL(do_sync_write);
|
|
|
|
ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
|
|
{
|
|
ssize_t ret;
|
|
|
|
if (!(file->f_mode & FMODE_WRITE))
|
|
return -EBADF;
|
|
if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))
|
|
return -EINVAL;
|
|
if (unlikely(!access_ok(VERIFY_READ, buf, count)))
|
|
return -EFAULT;
|
|
|
|
ret = rw_verify_area(WRITE, file, pos, count);
|
|
if (ret >= 0) {
|
|
count = ret;
|
|
ret = security_file_permission (file, MAY_WRITE);
|
|
if (!ret) {
|
|
if (file->f_op->write)
|
|
ret = file->f_op->write(file, buf, count, pos);
|
|
else
|
|
ret = do_sync_write(file, buf, count, pos);
|
|
if (ret > 0) {
|
|
fsnotify_modify(file->f_dentry);
|
|
current->wchar += ret;
|
|
}
|
|
current->syscw++;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
EXPORT_SYMBOL(vfs_write);
|
|
|
|
static inline loff_t file_pos_read(struct file *file)
|
|
{
|
|
return file->f_pos;
|
|
}
|
|
|
|
static inline void file_pos_write(struct file *file, loff_t pos)
|
|
{
|
|
file->f_pos = pos;
|
|
}
|
|
|
|
asmlinkage ssize_t sys_read(unsigned int fd, char __user * buf, size_t count)
|
|
{
|
|
struct file *file;
|
|
ssize_t ret = -EBADF;
|
|
int fput_needed;
|
|
|
|
file = fget_light(fd, &fput_needed);
|
|
if (file) {
|
|
loff_t pos = file_pos_read(file);
|
|
ret = vfs_read(file, buf, count, &pos);
|
|
file_pos_write(file, pos);
|
|
fput_light(file, fput_needed);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sys_read);
|
|
|
|
asmlinkage ssize_t sys_write(unsigned int fd, const char __user * buf, size_t count)
|
|
{
|
|
struct file *file;
|
|
ssize_t ret = -EBADF;
|
|
int fput_needed;
|
|
|
|
file = fget_light(fd, &fput_needed);
|
|
if (file) {
|
|
loff_t pos = file_pos_read(file);
|
|
ret = vfs_write(file, buf, count, &pos);
|
|
file_pos_write(file, pos);
|
|
fput_light(file, fput_needed);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage ssize_t sys_pread64(unsigned int fd, char __user *buf,
|
|
size_t count, loff_t pos)
|
|
{
|
|
struct file *file;
|
|
ssize_t ret = -EBADF;
|
|
int fput_needed;
|
|
|
|
if (pos < 0)
|
|
return -EINVAL;
|
|
|
|
file = fget_light(fd, &fput_needed);
|
|
if (file) {
|
|
ret = -ESPIPE;
|
|
if (file->f_mode & FMODE_PREAD)
|
|
ret = vfs_read(file, buf, count, &pos);
|
|
fput_light(file, fput_needed);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage ssize_t sys_pwrite64(unsigned int fd, const char __user *buf,
|
|
size_t count, loff_t pos)
|
|
{
|
|
struct file *file;
|
|
ssize_t ret = -EBADF;
|
|
int fput_needed;
|
|
|
|
if (pos < 0)
|
|
return -EINVAL;
|
|
|
|
file = fget_light(fd, &fput_needed);
|
|
if (file) {
|
|
ret = -ESPIPE;
|
|
if (file->f_mode & FMODE_PWRITE)
|
|
ret = vfs_write(file, buf, count, &pos);
|
|
fput_light(file, fput_needed);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Reduce an iovec's length in-place. Return the resulting number of segments
|
|
*/
|
|
unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to)
|
|
{
|
|
unsigned long seg = 0;
|
|
size_t len = 0;
|
|
|
|
while (seg < nr_segs) {
|
|
seg++;
|
|
if (len + iov->iov_len >= to) {
|
|
iov->iov_len = to - len;
|
|
break;
|
|
}
|
|
len += iov->iov_len;
|
|
iov++;
|
|
}
|
|
return seg;
|
|
}
|
|
|
|
EXPORT_SYMBOL(iov_shorten);
|
|
|
|
/* A write operation does a read from user space and vice versa */
|
|
#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
|
|
|
|
static ssize_t do_readv_writev(int type, struct file *file,
|
|
const struct iovec __user * uvector,
|
|
unsigned long nr_segs, loff_t *pos)
|
|
{
|
|
typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *);
|
|
typedef ssize_t (*iov_fn_t)(struct file *, const struct iovec *, unsigned long, loff_t *);
|
|
|
|
size_t tot_len;
|
|
struct iovec iovstack[UIO_FASTIOV];
|
|
struct iovec *iov=iovstack, *vector;
|
|
ssize_t ret;
|
|
int seg;
|
|
io_fn_t fn;
|
|
iov_fn_t fnv;
|
|
|
|
/*
|
|
* SuS says "The readv() function *may* fail if the iovcnt argument
|
|
* was less than or equal to 0, or greater than {IOV_MAX}. Linux has
|
|
* traditionally returned zero for zero segments, so...
|
|
*/
|
|
ret = 0;
|
|
if (nr_segs == 0)
|
|
goto out;
|
|
|
|
/*
|
|
* First get the "struct iovec" from user memory and
|
|
* verify all the pointers
|
|
*/
|
|
ret = -EINVAL;
|
|
if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
|
|
goto out;
|
|
if (!file->f_op)
|
|
goto out;
|
|
if (nr_segs > UIO_FASTIOV) {
|
|
ret = -ENOMEM;
|
|
iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
|
|
if (!iov)
|
|
goto out;
|
|
}
|
|
ret = -EFAULT;
|
|
if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector)))
|
|
goto out;
|
|
|
|
/*
|
|
* Single unix specification:
|
|
* We should -EINVAL if an element length is not >= 0 and fitting an
|
|
* ssize_t. The total length is fitting an ssize_t
|
|
*
|
|
* Be careful here because iov_len is a size_t not an ssize_t
|
|
*/
|
|
tot_len = 0;
|
|
ret = -EINVAL;
|
|
for (seg = 0; seg < nr_segs; seg++) {
|
|
void __user *buf = iov[seg].iov_base;
|
|
ssize_t len = (ssize_t)iov[seg].iov_len;
|
|
|
|
if (len < 0) /* size_t not fitting an ssize_t .. */
|
|
goto out;
|
|
if (unlikely(!access_ok(vrfy_dir(type), buf, len)))
|
|
goto Efault;
|
|
tot_len += len;
|
|
if ((ssize_t)tot_len < 0) /* maths overflow on the ssize_t */
|
|
goto out;
|
|
}
|
|
if (tot_len == 0) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
ret = rw_verify_area(type, file, pos, tot_len);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = security_file_permission(file, type == READ ? MAY_READ : MAY_WRITE);
|
|
if (ret)
|
|
goto out;
|
|
|
|
fnv = NULL;
|
|
if (type == READ) {
|
|
fn = file->f_op->read;
|
|
fnv = file->f_op->readv;
|
|
} else {
|
|
fn = (io_fn_t)file->f_op->write;
|
|
fnv = file->f_op->writev;
|
|
}
|
|
if (fnv) {
|
|
ret = fnv(file, iov, nr_segs, pos);
|
|
goto out;
|
|
}
|
|
|
|
/* Do it by hand, with file-ops */
|
|
ret = 0;
|
|
vector = iov;
|
|
while (nr_segs > 0) {
|
|
void __user * base;
|
|
size_t len;
|
|
ssize_t nr;
|
|
|
|
base = vector->iov_base;
|
|
len = vector->iov_len;
|
|
vector++;
|
|
nr_segs--;
|
|
|
|
nr = fn(file, base, len, pos);
|
|
|
|
if (nr < 0) {
|
|
if (!ret) ret = nr;
|
|
break;
|
|
}
|
|
ret += nr;
|
|
if (nr != len)
|
|
break;
|
|
}
|
|
out:
|
|
if (iov != iovstack)
|
|
kfree(iov);
|
|
if ((ret + (type == READ)) > 0) {
|
|
if (type == READ)
|
|
fsnotify_access(file->f_dentry);
|
|
else
|
|
fsnotify_modify(file->f_dentry);
|
|
}
|
|
return ret;
|
|
Efault:
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
|
|
unsigned long vlen, loff_t *pos)
|
|
{
|
|
if (!(file->f_mode & FMODE_READ))
|
|
return -EBADF;
|
|
if (!file->f_op || (!file->f_op->readv && !file->f_op->read))
|
|
return -EINVAL;
|
|
|
|
return do_readv_writev(READ, file, vec, vlen, pos);
|
|
}
|
|
|
|
EXPORT_SYMBOL(vfs_readv);
|
|
|
|
ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
|
|
unsigned long vlen, loff_t *pos)
|
|
{
|
|
if (!(file->f_mode & FMODE_WRITE))
|
|
return -EBADF;
|
|
if (!file->f_op || (!file->f_op->writev && !file->f_op->write))
|
|
return -EINVAL;
|
|
|
|
return do_readv_writev(WRITE, file, vec, vlen, pos);
|
|
}
|
|
|
|
EXPORT_SYMBOL(vfs_writev);
|
|
|
|
asmlinkage ssize_t
|
|
sys_readv(unsigned long fd, const struct iovec __user *vec, unsigned long vlen)
|
|
{
|
|
struct file *file;
|
|
ssize_t ret = -EBADF;
|
|
int fput_needed;
|
|
|
|
file = fget_light(fd, &fput_needed);
|
|
if (file) {
|
|
loff_t pos = file_pos_read(file);
|
|
ret = vfs_readv(file, vec, vlen, &pos);
|
|
file_pos_write(file, pos);
|
|
fput_light(file, fput_needed);
|
|
}
|
|
|
|
if (ret > 0)
|
|
current->rchar += ret;
|
|
current->syscr++;
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage ssize_t
|
|
sys_writev(unsigned long fd, const struct iovec __user *vec, unsigned long vlen)
|
|
{
|
|
struct file *file;
|
|
ssize_t ret = -EBADF;
|
|
int fput_needed;
|
|
|
|
file = fget_light(fd, &fput_needed);
|
|
if (file) {
|
|
loff_t pos = file_pos_read(file);
|
|
ret = vfs_writev(file, vec, vlen, &pos);
|
|
file_pos_write(file, pos);
|
|
fput_light(file, fput_needed);
|
|
}
|
|
|
|
if (ret > 0)
|
|
current->wchar += ret;
|
|
current->syscw++;
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
|
|
size_t count, loff_t max)
|
|
{
|
|
struct file * in_file, * out_file;
|
|
struct inode * in_inode, * out_inode;
|
|
loff_t pos;
|
|
ssize_t retval;
|
|
int fput_needed_in, fput_needed_out;
|
|
|
|
/*
|
|
* Get input file, and verify that it is ok..
|
|
*/
|
|
retval = -EBADF;
|
|
in_file = fget_light(in_fd, &fput_needed_in);
|
|
if (!in_file)
|
|
goto out;
|
|
if (!(in_file->f_mode & FMODE_READ))
|
|
goto fput_in;
|
|
retval = -EINVAL;
|
|
in_inode = in_file->f_dentry->d_inode;
|
|
if (!in_inode)
|
|
goto fput_in;
|
|
if (!in_file->f_op || !in_file->f_op->sendfile)
|
|
goto fput_in;
|
|
retval = -ESPIPE;
|
|
if (!ppos)
|
|
ppos = &in_file->f_pos;
|
|
else
|
|
if (!(in_file->f_mode & FMODE_PREAD))
|
|
goto fput_in;
|
|
retval = rw_verify_area(READ, in_file, ppos, count);
|
|
if (retval < 0)
|
|
goto fput_in;
|
|
count = retval;
|
|
|
|
retval = security_file_permission (in_file, MAY_READ);
|
|
if (retval)
|
|
goto fput_in;
|
|
|
|
/*
|
|
* Get output file, and verify that it is ok..
|
|
*/
|
|
retval = -EBADF;
|
|
out_file = fget_light(out_fd, &fput_needed_out);
|
|
if (!out_file)
|
|
goto fput_in;
|
|
if (!(out_file->f_mode & FMODE_WRITE))
|
|
goto fput_out;
|
|
retval = -EINVAL;
|
|
if (!out_file->f_op || !out_file->f_op->sendpage)
|
|
goto fput_out;
|
|
out_inode = out_file->f_dentry->d_inode;
|
|
retval = rw_verify_area(WRITE, out_file, &out_file->f_pos, count);
|
|
if (retval < 0)
|
|
goto fput_out;
|
|
count = retval;
|
|
|
|
retval = security_file_permission (out_file, MAY_WRITE);
|
|
if (retval)
|
|
goto fput_out;
|
|
|
|
if (!max)
|
|
max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);
|
|
|
|
pos = *ppos;
|
|
retval = -EINVAL;
|
|
if (unlikely(pos < 0))
|
|
goto fput_out;
|
|
if (unlikely(pos + count > max)) {
|
|
retval = -EOVERFLOW;
|
|
if (pos >= max)
|
|
goto fput_out;
|
|
count = max - pos;
|
|
}
|
|
|
|
retval = in_file->f_op->sendfile(in_file, ppos, count, file_send_actor, out_file);
|
|
|
|
if (retval > 0) {
|
|
current->rchar += retval;
|
|
current->wchar += retval;
|
|
}
|
|
current->syscr++;
|
|
current->syscw++;
|
|
|
|
if (*ppos > max)
|
|
retval = -EOVERFLOW;
|
|
|
|
fput_out:
|
|
fput_light(out_file, fput_needed_out);
|
|
fput_in:
|
|
fput_light(in_file, fput_needed_in);
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
asmlinkage ssize_t sys_sendfile(int out_fd, int in_fd, off_t __user *offset, size_t count)
|
|
{
|
|
loff_t pos;
|
|
off_t off;
|
|
ssize_t ret;
|
|
|
|
if (offset) {
|
|
if (unlikely(get_user(off, offset)))
|
|
return -EFAULT;
|
|
pos = off;
|
|
ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
|
|
if (unlikely(put_user(pos, offset)))
|
|
return -EFAULT;
|
|
return ret;
|
|
}
|
|
|
|
return do_sendfile(out_fd, in_fd, NULL, count, 0);
|
|
}
|
|
|
|
asmlinkage ssize_t sys_sendfile64(int out_fd, int in_fd, loff_t __user *offset, size_t count)
|
|
{
|
|
loff_t pos;
|
|
ssize_t ret;
|
|
|
|
if (offset) {
|
|
if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t))))
|
|
return -EFAULT;
|
|
ret = do_sendfile(out_fd, in_fd, &pos, count, 0);
|
|
if (unlikely(put_user(pos, offset)))
|
|
return -EFAULT;
|
|
return ret;
|
|
}
|
|
|
|
return do_sendfile(out_fd, in_fd, NULL, count, 0);
|
|
}
|