2005-04-16 16:20:36 -06:00
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/*
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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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Detach sched.h from mm.h
First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.
This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
getting them indirectly
Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
they don't need sched.h
b) sched.h stops being dependency for significant number of files:
on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
after patch it's only 3744 (-8.3%).
Cross-compile tested on
all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
alpha alpha-up
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-20 15:22:52 -06:00
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#include <linux/aio.h>
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2005-04-16 16:20:36 -06:00
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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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2006-12-08 03:37:39 -07:00
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struct dentry *dentry = file->f_path.dentry;
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2005-04-16 16:20:36 -06:00
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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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2006-03-31 16:16:26 -07:00
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BUG_ON(!mapping);
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2005-04-16 16:20:36 -06:00
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inode = mapping->host;
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2006-03-31 16:16:26 -07:00
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BUG_ON(!inode);
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2005-04-16 16:20:36 -06:00
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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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2006-12-08 03:37:39 -07:00
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struct dentry *dentry = file->f_path.dentry;
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2005-04-16 16:20:36 -06:00
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2006-01-08 02:03:05 -07:00
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DEBUG1("(%s/%s %d@%lld)\n", DENTRY_PATH(dentry), count,
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((unsigned long long)page->index << PAGE_CACHE_SHIFT) + offset);
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2005-04-16 16:20:36 -06:00
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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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2006-10-01 00:28:48 -06:00
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smb_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
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unsigned long nr_segs, loff_t pos)
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2005-04-16 16:20:36 -06:00
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{
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2006-10-01 00:28:48 -06:00
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struct file * file = iocb->ki_filp;
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2006-12-08 03:37:39 -07:00
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struct dentry * dentry = file->f_path.dentry;
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2005-04-16 16:20:36 -06:00
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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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2006-10-01 00:28:48 -06:00
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(unsigned long) iocb->ki_left, (unsigned long) pos);
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2005-04-16 16:20:36 -06:00
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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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2006-10-01 00:28:48 -06:00
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status = generic_file_aio_read(iocb, iov, nr_segs, pos);
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2005-04-16 16:20:36 -06:00
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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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2006-12-08 03:37:39 -07:00
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struct dentry * dentry = file->f_path.dentry;
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2005-04-16 16:20:36 -06:00
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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
|
2007-06-01 03:49:19 -06:00
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smb_file_splice_read(struct file *file, loff_t *ppos,
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struct pipe_inode_info *pipe, size_t count,
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unsigned int flags)
|
2005-04-16 16:20:36 -06:00
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{
|
2006-12-08 03:37:39 -07:00
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struct dentry *dentry = file->f_path.dentry;
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2005-04-16 16:20:36 -06:00
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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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}
|
2007-06-01 03:49:19 -06:00
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status = generic_file_splice_read(file, ppos, pipe, count, flags);
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2005-04-16 16:20:36 -06:00
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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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*/
|
2007-10-16 02:25:16 -06:00
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static int smb_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
|
2005-04-16 16:20:36 -06:00
|
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{
|
2007-10-16 02:25:16 -06:00
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pgoff_t index = pos >> PAGE_CACHE_SHIFT;
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*pagep = __grab_cache_page(mapping, index);
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if (!*pagep)
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return -ENOMEM;
|
2005-04-16 16:20:36 -06:00
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return 0;
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}
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|
2007-10-16 02:25:16 -06:00
|
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static int smb_write_end(struct file *file, struct address_space *mapping,
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|
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loff_t pos, unsigned len, unsigned copied,
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|
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struct page *page, void *fsdata)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
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|
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int status;
|
2007-10-16 02:25:16 -06:00
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unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
|
2005-04-16 16:20:36 -06:00
|
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|
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|
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lock_kernel();
|
2007-10-16 02:25:16 -06:00
|
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status = smb_updatepage(file, page, offset, copied);
|
2005-04-16 16:20:36 -06:00
|
|
|
unlock_kernel();
|
2007-10-16 02:25:16 -06:00
|
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|
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|
|
if (!status) {
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|
|
if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
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|
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SetPageUptodate(page);
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|
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status = copied;
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|
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}
|
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|
|
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|
|
unlock_page(page);
|
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|
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page_cache_release(page);
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
2006-06-28 05:26:44 -06:00
|
|
|
const struct address_space_operations smb_file_aops = {
|
2005-04-16 16:20:36 -06:00
|
|
|
.readpage = smb_readpage,
|
|
|
|
.writepage = smb_writepage,
|
2007-10-16 02:25:16 -06:00
|
|
|
.write_begin = smb_write_begin,
|
|
|
|
.write_end = smb_write_end,
|
2005-04-16 16:20:36 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Write to a file (through the page cache).
|
|
|
|
*/
|
|
|
|
static ssize_t
|
2006-10-01 00:28:48 -06:00
|
|
|
smb_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
|
|
|
|
unsigned long nr_segs, loff_t pos)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2006-10-01 00:28:48 -06:00
|
|
|
struct file * file = iocb->ki_filp;
|
2006-12-08 03:37:39 -07:00
|
|
|
struct dentry * dentry = file->f_path.dentry;
|
2005-04-16 16:20:36 -06:00
|
|
|
ssize_t result;
|
|
|
|
|
|
|
|
VERBOSE("file %s/%s, count=%lu@%lu\n",
|
|
|
|
DENTRY_PATH(dentry),
|
2006-10-01 00:28:48 -06:00
|
|
|
(unsigned long) iocb->ki_left, (unsigned long) pos);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
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;
|
|
|
|
|
2006-10-01 00:28:48 -06:00
|
|
|
if (iocb->ki_left > 0) {
|
|
|
|
result = generic_file_aio_write(iocb, iov, nr_segs, pos);
|
2005-04-16 16:20:36 -06:00
|
|
|
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, dentry->d_inode->i_atime);
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
smb_file_open(struct inode *inode, struct file * file)
|
|
|
|
{
|
|
|
|
int result;
|
2006-12-08 03:37:39 -07:00
|
|
|
struct dentry *dentry = file->f_path.dentry;
|
2005-04-16 16:20:36 -06:00
|
|
|
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 ... */
|
[PATCH] Fix and add EXPORT_SYMBOL(filemap_write_and_wait)
This patch add EXPORT_SYMBOL(filemap_write_and_wait) and use it.
See mm/filemap.c:
And changes the filemap_write_and_wait() and filemap_write_and_wait_range().
Current filemap_write_and_wait() doesn't wait if filemap_fdatawrite()
returns error. However, even if filemap_fdatawrite() returned an
error, it may have submitted the partially data pages to the device.
(e.g. in the case of -ENOSPC)
<quotation>
Andrew Morton writes,
If filemap_fdatawrite() returns an error, this might be due to some
I/O problem: dead disk, unplugged cable, etc. Given the generally
crappy quality of the kernel's handling of such exceptions, there's a
good chance that the filemap_fdatawait() will get stuck in D state
forever.
</quotation>
So, this patch doesn't wait if filemap_fdatawrite() returns the -EIO.
Trond, could you please review the nfs part? Especially I'm not sure,
nfs must use the "filemap_fdatawrite(inode->i_mapping) == 0", or not.
Acked-by: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-08 02:02:14 -07:00
|
|
|
filemap_write_and_wait(inode->i_mapping);
|
2005-04-16 16:20:36 -06:00
|
|
|
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, struct nameidata *nd)
|
|
|
|
{
|
|
|
|
int mode = inode->i_mode;
|
|
|
|
int error = 0;
|
|
|
|
|
|
|
|
VERBOSE("mode=%x, mask=%x\n", mode, mask);
|
|
|
|
|
|
|
|
/* Look at user permissions */
|
|
|
|
mode >>= 6;
|
|
|
|
if ((mode & 7 & mask) != mask)
|
|
|
|
error = -EACCES;
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2006-03-28 02:56:42 -07:00
|
|
|
const struct file_operations smb_file_operations =
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
.llseek = remote_llseek,
|
2006-10-01 00:28:48 -06:00
|
|
|
.read = do_sync_read,
|
|
|
|
.aio_read = smb_file_aio_read,
|
|
|
|
.write = do_sync_write,
|
|
|
|
.aio_write = smb_file_aio_write,
|
2005-04-16 16:20:36 -06:00
|
|
|
.ioctl = smb_ioctl,
|
|
|
|
.mmap = smb_file_mmap,
|
|
|
|
.open = smb_file_open,
|
|
|
|
.release = smb_file_release,
|
|
|
|
.fsync = smb_fsync,
|
2007-06-01 03:49:19 -06:00
|
|
|
.splice_read = smb_file_splice_read,
|
2005-04-16 16:20:36 -06:00
|
|
|
};
|
|
|
|
|
2007-02-12 01:55:40 -07:00
|
|
|
const struct inode_operations smb_file_inode_operations =
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
.permission = smb_file_permission,
|
|
|
|
.getattr = smb_getattr,
|
|
|
|
.setattr = smb_notify_change,
|
|
|
|
};
|