mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Jan Kara](/assets/img/avatar_default.png)
Commit6fb1ca92a6
"udf: Fix race between write(2) and close(2)" changed the condition when preallocation is released. The idea was that we don't want to release the preallocation for an inode on close when there are other writeable file descriptors for the inode. However the condition was written in the opposite way so we released preallocation only if there were other writeable file descriptors. Fix the problem by changing the condition properly. CC: stable@vger.kernel.org Fixes:6fb1ca92a6
Reported-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: Jan Kara <jack@suse.cz>
279 lines
6.7 KiB
C
279 lines
6.7 KiB
C
/*
|
|
* file.c
|
|
*
|
|
* PURPOSE
|
|
* File handling routines for the OSTA-UDF(tm) filesystem.
|
|
*
|
|
* COPYRIGHT
|
|
* This file is distributed under the terms of the GNU General Public
|
|
* License (GPL). Copies of the GPL can be obtained from:
|
|
* ftp://prep.ai.mit.edu/pub/gnu/GPL
|
|
* Each contributing author retains all rights to their own work.
|
|
*
|
|
* (C) 1998-1999 Dave Boynton
|
|
* (C) 1998-2004 Ben Fennema
|
|
* (C) 1999-2000 Stelias Computing Inc
|
|
*
|
|
* HISTORY
|
|
*
|
|
* 10/02/98 dgb Attempt to integrate into udf.o
|
|
* 10/07/98 Switched to using generic_readpage, etc., like isofs
|
|
* And it works!
|
|
* 12/06/98 blf Added udf_file_read. uses generic_file_read for all cases but
|
|
* ICBTAG_FLAG_AD_IN_ICB.
|
|
* 04/06/99 64 bit file handling on 32 bit systems taken from ext2 file.c
|
|
* 05/12/99 Preliminary file write support
|
|
*/
|
|
|
|
#include "udfdecl.h"
|
|
#include <linux/fs.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h> /* memset */
|
|
#include <linux/capability.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/aio.h>
|
|
|
|
#include "udf_i.h"
|
|
#include "udf_sb.h"
|
|
|
|
static void __udf_adinicb_readpage(struct page *page)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
char *kaddr;
|
|
struct udf_inode_info *iinfo = UDF_I(inode);
|
|
|
|
kaddr = kmap(page);
|
|
memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
|
|
memset(kaddr + inode->i_size, 0, PAGE_CACHE_SIZE - inode->i_size);
|
|
flush_dcache_page(page);
|
|
SetPageUptodate(page);
|
|
kunmap(page);
|
|
}
|
|
|
|
static int udf_adinicb_readpage(struct file *file, struct page *page)
|
|
{
|
|
BUG_ON(!PageLocked(page));
|
|
__udf_adinicb_readpage(page);
|
|
unlock_page(page);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int udf_adinicb_writepage(struct page *page,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
char *kaddr;
|
|
struct udf_inode_info *iinfo = UDF_I(inode);
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
|
|
kaddr = kmap(page);
|
|
memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
|
|
mark_inode_dirty(inode);
|
|
SetPageUptodate(page);
|
|
kunmap(page);
|
|
unlock_page(page);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int udf_adinicb_write_begin(struct file *file,
|
|
struct address_space *mapping, loff_t pos,
|
|
unsigned len, unsigned flags, struct page **pagep,
|
|
void **fsdata)
|
|
{
|
|
struct page *page;
|
|
|
|
if (WARN_ON_ONCE(pos >= PAGE_CACHE_SIZE))
|
|
return -EIO;
|
|
page = grab_cache_page_write_begin(mapping, 0, flags);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
*pagep = page;
|
|
|
|
if (!PageUptodate(page) && len != PAGE_CACHE_SIZE)
|
|
__udf_adinicb_readpage(page);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t udf_adinicb_direct_IO(int rw, struct kiocb *iocb,
|
|
struct iov_iter *iter,
|
|
loff_t offset)
|
|
{
|
|
/* Fallback to buffered I/O. */
|
|
return 0;
|
|
}
|
|
|
|
const struct address_space_operations udf_adinicb_aops = {
|
|
.readpage = udf_adinicb_readpage,
|
|
.writepage = udf_adinicb_writepage,
|
|
.write_begin = udf_adinicb_write_begin,
|
|
.write_end = simple_write_end,
|
|
.direct_IO = udf_adinicb_direct_IO,
|
|
};
|
|
|
|
static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
ssize_t retval;
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file_inode(file);
|
|
int err, pos;
|
|
size_t count = iocb->ki_nbytes;
|
|
struct udf_inode_info *iinfo = UDF_I(inode);
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
down_write(&iinfo->i_data_sem);
|
|
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
|
|
if (file->f_flags & O_APPEND)
|
|
pos = inode->i_size;
|
|
else
|
|
pos = iocb->ki_pos;
|
|
|
|
if (inode->i_sb->s_blocksize <
|
|
(udf_file_entry_alloc_offset(inode) +
|
|
pos + count)) {
|
|
err = udf_expand_file_adinicb(inode);
|
|
if (err) {
|
|
mutex_unlock(&inode->i_mutex);
|
|
udf_debug("udf_expand_adinicb: err=%d\n", err);
|
|
return err;
|
|
}
|
|
} else {
|
|
if (pos + count > inode->i_size)
|
|
iinfo->i_lenAlloc = pos + count;
|
|
else
|
|
iinfo->i_lenAlloc = inode->i_size;
|
|
up_write(&iinfo->i_data_sem);
|
|
}
|
|
} else
|
|
up_write(&iinfo->i_data_sem);
|
|
|
|
retval = __generic_file_write_iter(iocb, from);
|
|
mutex_unlock(&inode->i_mutex);
|
|
|
|
if (retval > 0) {
|
|
ssize_t err;
|
|
|
|
mark_inode_dirty(inode);
|
|
err = generic_write_sync(file, iocb->ki_pos - retval, retval);
|
|
if (err < 0)
|
|
retval = err;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct inode *inode = file_inode(filp);
|
|
long old_block, new_block;
|
|
int result = -EINVAL;
|
|
|
|
if (inode_permission(inode, MAY_READ) != 0) {
|
|
udf_debug("no permission to access inode %lu\n", inode->i_ino);
|
|
result = -EPERM;
|
|
goto out;
|
|
}
|
|
|
|
if (!arg) {
|
|
udf_debug("invalid argument to udf_ioctl\n");
|
|
result = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case UDF_GETVOLIDENT:
|
|
if (copy_to_user((char __user *)arg,
|
|
UDF_SB(inode->i_sb)->s_volume_ident, 32))
|
|
result = -EFAULT;
|
|
else
|
|
result = 0;
|
|
goto out;
|
|
case UDF_RELOCATE_BLOCKS:
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
result = -EPERM;
|
|
goto out;
|
|
}
|
|
if (get_user(old_block, (long __user *)arg)) {
|
|
result = -EFAULT;
|
|
goto out;
|
|
}
|
|
result = udf_relocate_blocks(inode->i_sb,
|
|
old_block, &new_block);
|
|
if (result == 0)
|
|
result = put_user(new_block, (long __user *)arg);
|
|
goto out;
|
|
case UDF_GETEASIZE:
|
|
result = put_user(UDF_I(inode)->i_lenEAttr, (int __user *)arg);
|
|
goto out;
|
|
case UDF_GETEABLOCK:
|
|
result = copy_to_user((char __user *)arg,
|
|
UDF_I(inode)->i_ext.i_data,
|
|
UDF_I(inode)->i_lenEAttr) ? -EFAULT : 0;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
static int udf_release_file(struct inode *inode, struct file *filp)
|
|
{
|
|
if (filp->f_mode & FMODE_WRITE &&
|
|
atomic_read(&inode->i_writecount) == 1) {
|
|
/*
|
|
* Grab i_mutex to avoid races with writes changing i_size
|
|
* while we are running.
|
|
*/
|
|
mutex_lock(&inode->i_mutex);
|
|
down_write(&UDF_I(inode)->i_data_sem);
|
|
udf_discard_prealloc(inode);
|
|
udf_truncate_tail_extent(inode);
|
|
up_write(&UDF_I(inode)->i_data_sem);
|
|
mutex_unlock(&inode->i_mutex);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations udf_file_operations = {
|
|
.read = new_sync_read,
|
|
.read_iter = generic_file_read_iter,
|
|
.unlocked_ioctl = udf_ioctl,
|
|
.open = generic_file_open,
|
|
.mmap = generic_file_mmap,
|
|
.write = new_sync_write,
|
|
.write_iter = udf_file_write_iter,
|
|
.release = udf_release_file,
|
|
.fsync = generic_file_fsync,
|
|
.splice_read = generic_file_splice_read,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static int udf_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int error;
|
|
|
|
error = inode_change_ok(inode, attr);
|
|
if (error)
|
|
return error;
|
|
|
|
if ((attr->ia_valid & ATTR_SIZE) &&
|
|
attr->ia_size != i_size_read(inode)) {
|
|
error = udf_setsize(inode, attr->ia_size);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
setattr_copy(inode, attr);
|
|
mark_inode_dirty(inode);
|
|
return 0;
|
|
}
|
|
|
|
const struct inode_operations udf_file_inode_operations = {
|
|
.setattr = udf_setattr,
|
|
};
|