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/*
* linux/fs/ext3/file.c
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* from
*
* linux/fs/minix/file.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* ext3 fs regular file handling primitives
*
* 64-bit file support on 64-bit platforms by Jakub Jelinek
* (jj@sunsite.ms.mff.cuni.cz)
*/
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/locks.h>
#include <linux/jbd.h>
#include <linux/ext3_fs.h>
#include <linux/ext3_jbd.h>
#include <linux/smp_lock.h>
/*
* Called when an inode is released. Note that this is different
* from ext3_file_open: open gets called at every open, but release
* gets called only when /all/ the files are closed.
*/
static int ext3_release_file (struct inode * inode, struct file * filp)
{
if (filp->f_mode & FMODE_WRITE)
ext3_discard_prealloc (inode);
return 0;
}
/*
* Called when an inode is about to be opened.
* We use this to disallow opening RW large files on 32bit systems if
* the caller didn't specify O_LARGEFILE. On 64bit systems we force
* on this flag in sys_open.
*/
static int ext3_open_file (struct inode * inode, struct file * filp)
{
if (!(filp->f_flags & O_LARGEFILE) &&
inode->i_size > 0x7FFFFFFFLL)
return -EFBIG;
return 0;
}
/*
* ext3_file_write().
*
* Most things are done in ext3_prepare_write() and ext3_commit_write().
*/
static ssize_t
ext3_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
struct inode *inode = file->f_dentry->d_inode;
/*
* Nasty: if the file is subject to synchronous writes then we need
* to force generic_osync_inode() to call ext3_write_inode().
* We do that by marking the inode dirty. This adds much more
* computational expense than we need, but we're going to sync
* anyway.
*/
if (IS_SYNC(inode) || (file->f_flags & O_SYNC))
mark_inode_dirty(inode);
return generic_file_write(file, buf, count, ppos);
}
struct file_operations ext3_file_operations = {
llseek: generic_file_llseek, /* BKL held */
read: generic_file_read, /* BKL not held. Don't need */
write: ext3_file_write, /* BKL not held. Don't need */
ioctl: ext3_ioctl, /* BKL held */
mmap: generic_file_mmap,
open: ext3_open_file, /* BKL not held. Don't need */
release: ext3_release_file, /* BKL not held. Don't need */
fsync: ext3_sync_file, /* BKL held */
};
struct inode_operations ext3_file_inode_operations = {
truncate: ext3_truncate, /* BKL held */
setattr: ext3_setattr, /* BKL held */
};
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