mirror of https://gitee.com/openkylin/linux.git
454 lines
11 KiB
C
454 lines
11 KiB
C
/*
|
|
* file.c
|
|
*
|
|
* Copyright (C) 1995, 1996, 1997 by Paal-Kr. Engstad and Volker Lendecke
|
|
* Copyright (C) 1997 by Volker Lendecke
|
|
*
|
|
* Please add a note about your changes to smbfs in the ChangeLog file.
|
|
*/
|
|
|
|
#include <linux/time.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/net.h>
|
|
#include <linux/aio.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/system.h>
|
|
|
|
#include <linux/smbno.h>
|
|
#include <linux/smb_fs.h>
|
|
|
|
#include "smb_debug.h"
|
|
#include "proto.h"
|
|
|
|
static int
|
|
smb_fsync(struct file *file, struct dentry * dentry, int datasync)
|
|
{
|
|
struct smb_sb_info *server = server_from_dentry(dentry);
|
|
int result;
|
|
|
|
VERBOSE("sync file %s/%s\n", DENTRY_PATH(dentry));
|
|
|
|
/*
|
|
* The VFS will writepage() all dirty pages for us, but we
|
|
* should send a SMBflush to the server, letting it know that
|
|
* we want things synchronized with actual storage.
|
|
*
|
|
* Note: this function requires all pages to have been written already
|
|
* (should be ok with writepage_sync)
|
|
*/
|
|
result = smb_proc_flush(server, SMB_I(dentry->d_inode)->fileid);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Read a page synchronously.
|
|
*/
|
|
static int
|
|
smb_readpage_sync(struct dentry *dentry, struct page *page)
|
|
{
|
|
char *buffer = kmap(page);
|
|
loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
|
struct smb_sb_info *server = server_from_dentry(dentry);
|
|
unsigned int rsize = smb_get_rsize(server);
|
|
int count = PAGE_SIZE;
|
|
int result;
|
|
|
|
VERBOSE("file %s/%s, count=%d@%Ld, rsize=%d\n",
|
|
DENTRY_PATH(dentry), count, offset, rsize);
|
|
|
|
result = smb_open(dentry, SMB_O_RDONLY);
|
|
if (result < 0)
|
|
goto io_error;
|
|
|
|
do {
|
|
if (count < rsize)
|
|
rsize = count;
|
|
|
|
result = server->ops->read(dentry->d_inode,offset,rsize,buffer);
|
|
if (result < 0)
|
|
goto io_error;
|
|
|
|
count -= result;
|
|
offset += result;
|
|
buffer += result;
|
|
dentry->d_inode->i_atime =
|
|
current_fs_time(dentry->d_inode->i_sb);
|
|
if (result < rsize)
|
|
break;
|
|
} while (count);
|
|
|
|
memset(buffer, 0, count);
|
|
flush_dcache_page(page);
|
|
SetPageUptodate(page);
|
|
result = 0;
|
|
|
|
io_error:
|
|
kunmap(page);
|
|
unlock_page(page);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* We are called with the page locked and we unlock it when done.
|
|
*/
|
|
static int
|
|
smb_readpage(struct file *file, struct page *page)
|
|
{
|
|
int error;
|
|
struct dentry *dentry = file->f_path.dentry;
|
|
|
|
page_cache_get(page);
|
|
error = smb_readpage_sync(dentry, page);
|
|
page_cache_release(page);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Write a page synchronously.
|
|
* Offset is the data offset within the page.
|
|
*/
|
|
static int
|
|
smb_writepage_sync(struct inode *inode, struct page *page,
|
|
unsigned long pageoffset, unsigned int count)
|
|
{
|
|
loff_t offset;
|
|
char *buffer = kmap(page) + pageoffset;
|
|
struct smb_sb_info *server = server_from_inode(inode);
|
|
unsigned int wsize = smb_get_wsize(server);
|
|
int ret = 0;
|
|
|
|
offset = ((loff_t)page->index << PAGE_CACHE_SHIFT) + pageoffset;
|
|
VERBOSE("file ino=%ld, fileid=%d, count=%d@%Ld, wsize=%d\n",
|
|
inode->i_ino, SMB_I(inode)->fileid, count, offset, wsize);
|
|
|
|
do {
|
|
int write_ret;
|
|
|
|
if (count < wsize)
|
|
wsize = count;
|
|
|
|
write_ret = server->ops->write(inode, offset, wsize, buffer);
|
|
if (write_ret < 0) {
|
|
PARANOIA("failed write, wsize=%d, write_ret=%d\n",
|
|
wsize, write_ret);
|
|
ret = write_ret;
|
|
break;
|
|
}
|
|
/* N.B. what if result < wsize?? */
|
|
#ifdef SMBFS_PARANOIA
|
|
if (write_ret < wsize)
|
|
PARANOIA("short write, wsize=%d, write_ret=%d\n",
|
|
wsize, write_ret);
|
|
#endif
|
|
buffer += wsize;
|
|
offset += wsize;
|
|
count -= wsize;
|
|
/*
|
|
* Update the inode now rather than waiting for a refresh.
|
|
*/
|
|
inode->i_mtime = inode->i_atime = current_fs_time(inode->i_sb);
|
|
SMB_I(inode)->flags |= SMB_F_LOCALWRITE;
|
|
if (offset > inode->i_size)
|
|
inode->i_size = offset;
|
|
} while (count);
|
|
|
|
kunmap(page);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Write a page to the server. This will be used for NFS swapping only
|
|
* (for now), and we currently do this synchronously only.
|
|
*
|
|
* We are called with the page locked and we unlock it when done.
|
|
*/
|
|
static int
|
|
smb_writepage(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
struct address_space *mapping = page->mapping;
|
|
struct inode *inode;
|
|
unsigned long end_index;
|
|
unsigned offset = PAGE_CACHE_SIZE;
|
|
int err;
|
|
|
|
BUG_ON(!mapping);
|
|
inode = mapping->host;
|
|
BUG_ON(!inode);
|
|
|
|
end_index = inode->i_size >> PAGE_CACHE_SHIFT;
|
|
|
|
/* easy case */
|
|
if (page->index < end_index)
|
|
goto do_it;
|
|
/* things got complicated... */
|
|
offset = inode->i_size & (PAGE_CACHE_SIZE-1);
|
|
/* OK, are we completely out? */
|
|
if (page->index >= end_index+1 || !offset)
|
|
return 0; /* truncated - don't care */
|
|
do_it:
|
|
page_cache_get(page);
|
|
err = smb_writepage_sync(inode, page, 0, offset);
|
|
SetPageUptodate(page);
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
smb_updatepage(struct file *file, struct page *page, unsigned long offset,
|
|
unsigned int count)
|
|
{
|
|
struct dentry *dentry = file->f_path.dentry;
|
|
|
|
DEBUG1("(%s/%s %d@%lld)\n", DENTRY_PATH(dentry), count,
|
|
((unsigned long long)page->index << PAGE_CACHE_SHIFT) + offset);
|
|
|
|
return smb_writepage_sync(dentry->d_inode, page, offset, count);
|
|
}
|
|
|
|
static ssize_t
|
|
smb_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t pos)
|
|
{
|
|
struct file * file = iocb->ki_filp;
|
|
struct dentry * dentry = file->f_path.dentry;
|
|
ssize_t status;
|
|
|
|
VERBOSE("file %s/%s, count=%lu@%lu\n", DENTRY_PATH(dentry),
|
|
(unsigned long) iocb->ki_left, (unsigned long) pos);
|
|
|
|
status = smb_revalidate_inode(dentry);
|
|
if (status) {
|
|
PARANOIA("%s/%s validation failed, error=%Zd\n",
|
|
DENTRY_PATH(dentry), status);
|
|
goto out;
|
|
}
|
|
|
|
VERBOSE("before read, size=%ld, flags=%x, atime=%ld\n",
|
|
(long)dentry->d_inode->i_size,
|
|
dentry->d_inode->i_flags, dentry->d_inode->i_atime.tv_sec);
|
|
|
|
status = generic_file_aio_read(iocb, iov, nr_segs, pos);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
smb_file_mmap(struct file * file, struct vm_area_struct * vma)
|
|
{
|
|
struct dentry * dentry = file->f_path.dentry;
|
|
int status;
|
|
|
|
VERBOSE("file %s/%s, address %lu - %lu\n",
|
|
DENTRY_PATH(dentry), vma->vm_start, vma->vm_end);
|
|
|
|
status = smb_revalidate_inode(dentry);
|
|
if (status) {
|
|
PARANOIA("%s/%s validation failed, error=%d\n",
|
|
DENTRY_PATH(dentry), status);
|
|
goto out;
|
|
}
|
|
status = generic_file_mmap(file, vma);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static ssize_t
|
|
smb_file_splice_read(struct file *file, loff_t *ppos,
|
|
struct pipe_inode_info *pipe, size_t count,
|
|
unsigned int flags)
|
|
{
|
|
struct dentry *dentry = file->f_path.dentry;
|
|
ssize_t status;
|
|
|
|
VERBOSE("file %s/%s, pos=%Ld, count=%lu\n",
|
|
DENTRY_PATH(dentry), *ppos, count);
|
|
|
|
status = smb_revalidate_inode(dentry);
|
|
if (status) {
|
|
PARANOIA("%s/%s validation failed, error=%Zd\n",
|
|
DENTRY_PATH(dentry), status);
|
|
goto out;
|
|
}
|
|
status = generic_file_splice_read(file, ppos, pipe, count, flags);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* This does the "real" work of the write. The generic routine has
|
|
* allocated the page, locked it, done all the page alignment stuff
|
|
* calculations etc. Now we should just copy the data from user
|
|
* space and write it back to the real medium..
|
|
*
|
|
* If the writer ends up delaying the write, the writer needs to
|
|
* increment the page use counts until he is done with the page.
|
|
*/
|
|
static int smb_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
|
|
*pagep = grab_cache_page_write_begin(mapping, index, flags);
|
|
if (!*pagep)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static int smb_write_end(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page, void *fsdata)
|
|
{
|
|
int status;
|
|
unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
|
|
|
|
lock_kernel();
|
|
status = smb_updatepage(file, page, offset, copied);
|
|
unlock_kernel();
|
|
|
|
if (!status) {
|
|
if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
|
|
SetPageUptodate(page);
|
|
status = copied;
|
|
}
|
|
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
|
|
return status;
|
|
}
|
|
|
|
const struct address_space_operations smb_file_aops = {
|
|
.readpage = smb_readpage,
|
|
.writepage = smb_writepage,
|
|
.write_begin = smb_write_begin,
|
|
.write_end = smb_write_end,
|
|
};
|
|
|
|
/*
|
|
* Write to a file (through the page cache).
|
|
*/
|
|
static ssize_t
|
|
smb_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t pos)
|
|
{
|
|
struct file * file = iocb->ki_filp;
|
|
struct dentry * dentry = file->f_path.dentry;
|
|
ssize_t result;
|
|
|
|
VERBOSE("file %s/%s, count=%lu@%lu\n",
|
|
DENTRY_PATH(dentry),
|
|
(unsigned long) iocb->ki_left, (unsigned long) pos);
|
|
|
|
result = smb_revalidate_inode(dentry);
|
|
if (result) {
|
|
PARANOIA("%s/%s validation failed, error=%Zd\n",
|
|
DENTRY_PATH(dentry), result);
|
|
goto out;
|
|
}
|
|
|
|
result = smb_open(dentry, SMB_O_WRONLY);
|
|
if (result)
|
|
goto out;
|
|
|
|
if (iocb->ki_left > 0) {
|
|
result = generic_file_aio_write(iocb, iov, nr_segs, pos);
|
|
VERBOSE("pos=%ld, size=%ld, mtime=%ld, atime=%ld\n",
|
|
(long) file->f_pos, (long) dentry->d_inode->i_size,
|
|
dentry->d_inode->i_mtime.tv_sec,
|
|
dentry->d_inode->i_atime.tv_sec);
|
|
}
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
smb_file_open(struct inode *inode, struct file * file)
|
|
{
|
|
int result;
|
|
struct dentry *dentry = file->f_path.dentry;
|
|
int smb_mode = (file->f_mode & O_ACCMODE) - 1;
|
|
|
|
lock_kernel();
|
|
result = smb_open(dentry, smb_mode);
|
|
if (result)
|
|
goto out;
|
|
SMB_I(inode)->openers++;
|
|
out:
|
|
unlock_kernel();
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
smb_file_release(struct inode *inode, struct file * file)
|
|
{
|
|
lock_kernel();
|
|
if (!--SMB_I(inode)->openers) {
|
|
/* We must flush any dirty pages now as we won't be able to
|
|
write anything after close. mmap can trigger this.
|
|
"openers" should perhaps include mmap'ers ... */
|
|
filemap_write_and_wait(inode->i_mapping);
|
|
smb_close(inode);
|
|
}
|
|
unlock_kernel();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check whether the required access is compatible with
|
|
* an inode's permission. SMB doesn't recognize superuser
|
|
* privileges, so we need our own check for this.
|
|
*/
|
|
static int
|
|
smb_file_permission(struct inode *inode, int mask)
|
|
{
|
|
int mode = inode->i_mode;
|
|
int error = 0;
|
|
|
|
VERBOSE("mode=%x, mask=%x\n", mode, mask);
|
|
|
|
/* Look at user permissions */
|
|
mode >>= 6;
|
|
if (mask & ~mode & (MAY_READ | MAY_WRITE | MAY_EXEC))
|
|
error = -EACCES;
|
|
return error;
|
|
}
|
|
|
|
static loff_t smb_remote_llseek(struct file *file, loff_t offset, int origin)
|
|
{
|
|
loff_t ret;
|
|
lock_kernel();
|
|
ret = generic_file_llseek_unlocked(file, offset, origin);
|
|
unlock_kernel();
|
|
return ret;
|
|
}
|
|
|
|
const struct file_operations smb_file_operations =
|
|
{
|
|
.llseek = smb_remote_llseek,
|
|
.read = do_sync_read,
|
|
.aio_read = smb_file_aio_read,
|
|
.write = do_sync_write,
|
|
.aio_write = smb_file_aio_write,
|
|
.ioctl = smb_ioctl,
|
|
.mmap = smb_file_mmap,
|
|
.open = smb_file_open,
|
|
.release = smb_file_release,
|
|
.fsync = smb_fsync,
|
|
.splice_read = smb_file_splice_read,
|
|
};
|
|
|
|
const struct inode_operations smb_file_inode_operations =
|
|
{
|
|
.permission = smb_file_permission,
|
|
.getattr = smb_getattr,
|
|
.setattr = smb_notify_change,
|
|
};
|