![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
424 lines
9.9 KiB
C
424 lines
9.9 KiB
C
/*
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* file.c
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*
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* Copyright (C) 1995, 1996, 1997 by Paal-Kr. Engstad and Volker Lendecke
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* Copyright (C) 1997 by Volker Lendecke
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*
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* Please add a note about your changes to smbfs in the ChangeLog file.
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*/
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/smp_lock.h>
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#include <linux/net.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/smbno.h>
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#include <linux/smb_fs.h>
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#include "smb_debug.h"
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#include "proto.h"
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static int
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smb_fsync(struct file *file, struct dentry * dentry, int datasync)
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{
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struct smb_sb_info *server = server_from_dentry(dentry);
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int result;
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VERBOSE("sync file %s/%s\n", DENTRY_PATH(dentry));
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/*
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* The VFS will writepage() all dirty pages for us, but we
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* should send a SMBflush to the server, letting it know that
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* we want things synchronized with actual storage.
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*
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* Note: this function requires all pages to have been written already
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* (should be ok with writepage_sync)
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*/
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result = smb_proc_flush(server, SMB_I(dentry->d_inode)->fileid);
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return result;
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}
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/*
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* Read a page synchronously.
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*/
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static int
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smb_readpage_sync(struct dentry *dentry, struct page *page)
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{
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char *buffer = kmap(page);
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loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
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struct smb_sb_info *server = server_from_dentry(dentry);
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unsigned int rsize = smb_get_rsize(server);
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int count = PAGE_SIZE;
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int result;
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VERBOSE("file %s/%s, count=%d@%Ld, rsize=%d\n",
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DENTRY_PATH(dentry), count, offset, rsize);
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result = smb_open(dentry, SMB_O_RDONLY);
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if (result < 0)
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goto io_error;
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do {
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if (count < rsize)
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rsize = count;
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result = server->ops->read(dentry->d_inode,offset,rsize,buffer);
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if (result < 0)
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goto io_error;
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count -= result;
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offset += result;
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buffer += result;
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dentry->d_inode->i_atime =
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current_fs_time(dentry->d_inode->i_sb);
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if (result < rsize)
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break;
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} while (count);
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memset(buffer, 0, count);
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flush_dcache_page(page);
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SetPageUptodate(page);
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result = 0;
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io_error:
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kunmap(page);
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unlock_page(page);
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return result;
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}
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/*
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* We are called with the page locked and we unlock it when done.
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*/
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static int
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smb_readpage(struct file *file, struct page *page)
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{
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int error;
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struct dentry *dentry = file->f_dentry;
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page_cache_get(page);
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error = smb_readpage_sync(dentry, page);
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page_cache_release(page);
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return error;
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}
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/*
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* Write a page synchronously.
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* Offset is the data offset within the page.
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*/
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static int
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smb_writepage_sync(struct inode *inode, struct page *page,
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unsigned long pageoffset, unsigned int count)
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{
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loff_t offset;
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char *buffer = kmap(page) + pageoffset;
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struct smb_sb_info *server = server_from_inode(inode);
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unsigned int wsize = smb_get_wsize(server);
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int ret = 0;
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offset = ((loff_t)page->index << PAGE_CACHE_SHIFT) + pageoffset;
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VERBOSE("file ino=%ld, fileid=%d, count=%d@%Ld, wsize=%d\n",
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inode->i_ino, SMB_I(inode)->fileid, count, offset, wsize);
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do {
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int write_ret;
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if (count < wsize)
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wsize = count;
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write_ret = server->ops->write(inode, offset, wsize, buffer);
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if (write_ret < 0) {
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PARANOIA("failed write, wsize=%d, write_ret=%d\n",
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wsize, write_ret);
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ret = write_ret;
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break;
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}
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/* N.B. what if result < wsize?? */
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#ifdef SMBFS_PARANOIA
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if (write_ret < wsize)
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PARANOIA("short write, wsize=%d, write_ret=%d\n",
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wsize, write_ret);
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#endif
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buffer += wsize;
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offset += wsize;
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count -= wsize;
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/*
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* Update the inode now rather than waiting for a refresh.
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*/
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inode->i_mtime = inode->i_atime = current_fs_time(inode->i_sb);
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SMB_I(inode)->flags |= SMB_F_LOCALWRITE;
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if (offset > inode->i_size)
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inode->i_size = offset;
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} while (count);
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kunmap(page);
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return ret;
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}
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/*
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* Write a page to the server. This will be used for NFS swapping only
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* (for now), and we currently do this synchronously only.
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*
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* We are called with the page locked and we unlock it when done.
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*/
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static int
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smb_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct address_space *mapping = page->mapping;
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struct inode *inode;
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unsigned long end_index;
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unsigned offset = PAGE_CACHE_SIZE;
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int err;
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if (!mapping)
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BUG();
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inode = mapping->host;
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if (!inode)
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BUG();
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end_index = inode->i_size >> PAGE_CACHE_SHIFT;
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/* easy case */
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if (page->index < end_index)
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goto do_it;
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/* things got complicated... */
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offset = inode->i_size & (PAGE_CACHE_SIZE-1);
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/* OK, are we completely out? */
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if (page->index >= end_index+1 || !offset)
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return 0; /* truncated - don't care */
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do_it:
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page_cache_get(page);
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err = smb_writepage_sync(inode, page, 0, offset);
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SetPageUptodate(page);
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unlock_page(page);
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page_cache_release(page);
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return err;
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}
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static int
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smb_updatepage(struct file *file, struct page *page, unsigned long offset,
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unsigned int count)
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{
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struct dentry *dentry = file->f_dentry;
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DEBUG1("(%s/%s %d@%ld)\n", DENTRY_PATH(dentry),
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count, (page->index << PAGE_CACHE_SHIFT)+offset);
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return smb_writepage_sync(dentry->d_inode, page, offset, count);
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}
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static ssize_t
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smb_file_read(struct file * file, char __user * buf, size_t count, loff_t *ppos)
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{
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struct dentry * dentry = file->f_dentry;
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ssize_t status;
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VERBOSE("file %s/%s, count=%lu@%lu\n", DENTRY_PATH(dentry),
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(unsigned long) count, (unsigned long) *ppos);
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status = smb_revalidate_inode(dentry);
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if (status) {
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PARANOIA("%s/%s validation failed, error=%Zd\n",
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DENTRY_PATH(dentry), status);
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goto out;
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}
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VERBOSE("before read, size=%ld, flags=%x, atime=%ld\n",
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(long)dentry->d_inode->i_size,
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dentry->d_inode->i_flags, dentry->d_inode->i_atime);
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status = generic_file_read(file, buf, count, ppos);
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out:
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return status;
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}
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static int
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smb_file_mmap(struct file * file, struct vm_area_struct * vma)
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{
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struct dentry * dentry = file->f_dentry;
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int status;
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VERBOSE("file %s/%s, address %lu - %lu\n",
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DENTRY_PATH(dentry), vma->vm_start, vma->vm_end);
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status = smb_revalidate_inode(dentry);
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if (status) {
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PARANOIA("%s/%s validation failed, error=%d\n",
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DENTRY_PATH(dentry), status);
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goto out;
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}
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status = generic_file_mmap(file, vma);
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out:
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return status;
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}
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static ssize_t
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smb_file_sendfile(struct file *file, loff_t *ppos,
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size_t count, read_actor_t actor, void *target)
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{
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struct dentry *dentry = file->f_dentry;
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ssize_t status;
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VERBOSE("file %s/%s, pos=%Ld, count=%d\n",
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DENTRY_PATH(dentry), *ppos, count);
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status = smb_revalidate_inode(dentry);
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if (status) {
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PARANOIA("%s/%s validation failed, error=%Zd\n",
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DENTRY_PATH(dentry), status);
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goto out;
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}
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status = generic_file_sendfile(file, ppos, count, actor, target);
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out:
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return status;
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}
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/*
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* This does the "real" work of the write. The generic routine has
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* allocated the page, locked it, done all the page alignment stuff
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* calculations etc. Now we should just copy the data from user
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* space and write it back to the real medium..
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*
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* If the writer ends up delaying the write, the writer needs to
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* increment the page use counts until he is done with the page.
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*/
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static int smb_prepare_write(struct file *file, struct page *page,
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unsigned offset, unsigned to)
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{
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return 0;
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}
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static int smb_commit_write(struct file *file, struct page *page,
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unsigned offset, unsigned to)
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{
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int status;
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status = -EFAULT;
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lock_kernel();
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status = smb_updatepage(file, page, offset, to-offset);
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unlock_kernel();
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return status;
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}
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struct address_space_operations smb_file_aops = {
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.readpage = smb_readpage,
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.writepage = smb_writepage,
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.prepare_write = smb_prepare_write,
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.commit_write = smb_commit_write
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};
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/*
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* Write to a file (through the page cache).
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*/
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static ssize_t
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smb_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
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{
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struct dentry * dentry = file->f_dentry;
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ssize_t result;
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VERBOSE("file %s/%s, count=%lu@%lu\n",
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DENTRY_PATH(dentry),
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(unsigned long) count, (unsigned long) *ppos);
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result = smb_revalidate_inode(dentry);
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if (result) {
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PARANOIA("%s/%s validation failed, error=%Zd\n",
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DENTRY_PATH(dentry), result);
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goto out;
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}
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result = smb_open(dentry, SMB_O_WRONLY);
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if (result)
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goto out;
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if (count > 0) {
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result = generic_file_write(file, buf, count, ppos);
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VERBOSE("pos=%ld, size=%ld, mtime=%ld, atime=%ld\n",
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(long) file->f_pos, (long) dentry->d_inode->i_size,
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dentry->d_inode->i_mtime, dentry->d_inode->i_atime);
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}
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out:
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return result;
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}
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static int
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smb_file_open(struct inode *inode, struct file * file)
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{
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int result;
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struct dentry *dentry = file->f_dentry;
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int smb_mode = (file->f_mode & O_ACCMODE) - 1;
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lock_kernel();
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result = smb_open(dentry, smb_mode);
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if (result)
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goto out;
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SMB_I(inode)->openers++;
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out:
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unlock_kernel();
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return result;
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}
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static int
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smb_file_release(struct inode *inode, struct file * file)
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{
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lock_kernel();
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if (!--SMB_I(inode)->openers) {
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/* We must flush any dirty pages now as we won't be able to
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write anything after close. mmap can trigger this.
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"openers" should perhaps include mmap'ers ... */
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filemap_fdatawrite(inode->i_mapping);
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filemap_fdatawait(inode->i_mapping);
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smb_close(inode);
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}
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unlock_kernel();
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return 0;
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}
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/*
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* Check whether the required access is compatible with
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* an inode's permission. SMB doesn't recognize superuser
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* privileges, so we need our own check for this.
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*/
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static int
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smb_file_permission(struct inode *inode, int mask, struct nameidata *nd)
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{
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int mode = inode->i_mode;
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int error = 0;
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VERBOSE("mode=%x, mask=%x\n", mode, mask);
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/* Look at user permissions */
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mode >>= 6;
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if ((mode & 7 & mask) != mask)
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error = -EACCES;
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return error;
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}
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struct file_operations smb_file_operations =
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{
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.llseek = remote_llseek,
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.read = smb_file_read,
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.write = smb_file_write,
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.ioctl = smb_ioctl,
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.mmap = smb_file_mmap,
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.open = smb_file_open,
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.release = smb_file_release,
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.fsync = smb_fsync,
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.sendfile = smb_file_sendfile,
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};
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struct inode_operations smb_file_inode_operations =
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{
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.permission = smb_file_permission,
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.getattr = smb_getattr,
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.setattr = smb_notify_change,
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};
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