LXR linux/fs/ext2/file.c

   1/*
   2 *  linux/fs/ext2/file.c
   3 *
   4 * Copyright (C) 1992, 1993, 1994, 1995
   5 * Remy Card (card@masi.ibp.fr)
   6 * Laboratoire MASI - Institut Blaise Pascal
   7 * Universite Pierre et Marie Curie (Paris VI)
   8 *
   9 *  from
  10 *
  11 *  linux/fs/minix/file.c
  12 *
  13 *  Copyright (C) 1991, 1992  Linus Torvalds
  14 *
  15 *  ext2 fs regular file handling primitives
  16 *
  17 *  64-bit file support on 64-bit platforms by Jakub Jelinek
  18 *      (jj@sunsite.ms.mff.cuni.cz)
  19 */
  20
  21#include <linux/time.h>
  22#include <linux/pagemap.h>
  23#include "ext2.h"
  24#include "xattr.h"
  25#include "acl.h"
  26
  27/*
  28 * Called when filp is released. This happens when all file descriptors
  29 * for a single struct file are closed. Note that different open() calls
  30 * for the same file yield different struct file structures.
  31 */
  32static int ext2_release_file (struct inode * inode, struct file * filp)
  33{
  34        if (filp->f_mode & FMODE_WRITE) {
  35                mutex_lock(&EXT2_I(inode)->truncate_mutex);
  36                ext2_discard_reservation(inode);
  37                mutex_unlock(&EXT2_I(inode)->truncate_mutex);
  38        }
  39        return 0;
  40}
  41
  42int ext2_fsync(struct file *file, struct dentry *dentry, int datasync)
  43{
  44        int ret;
  45        struct super_block *sb = dentry->d_inode->i_sb;
  46        struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
  47
  48        ret = simple_fsync(file, dentry, datasync);
  49        if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
  50                /* We don't really know where the IO error happened... */
  51                ext2_error(sb, __func__,
  52                           "detected IO error when writing metadata buffers");
  53                ret = -EIO;
  54        }
  55        return ret;
  56}
  57
  58/*
  59 * We have mostly NULL's here: the current defaults are ok for
  60 * the ext2 filesystem.
  61 */
  62const struct file_operations ext2_file_operations = {
  63        .llseek         = generic_file_llseek,
  64        .read           = do_sync_read,
  65        .write          = do_sync_write,
  66        .aio_read       = generic_file_aio_read,
  67        .aio_write      = generic_file_aio_write,
  68        .unlocked_ioctl = ext2_ioctl,
  69#ifdef CONFIG_COMPAT
  70        .compat_ioctl   = ext2_compat_ioctl,
  71#endif
  72        .mmap           = generic_file_mmap,
  73        .open           = generic_file_open,
  74        .release        = ext2_release_file,
  75        .fsync          = ext2_fsync,
  76        .splice_read    = generic_file_splice_read,
  77        .splice_write   = generic_file_splice_write,
  78};
  79
  80#ifdef CONFIG_EXT2_FS_XIP
  81const struct file_operations ext2_xip_file_operations = {
  82        .llseek         = generic_file_llseek,
  83        .read           = xip_file_read,
  84        .write          = xip_file_write,
  85        .unlocked_ioctl = ext2_ioctl,
  86#ifdef CONFIG_COMPAT
  87        .compat_ioctl   = ext2_compat_ioctl,
  88#endif
  89        .mmap           = xip_file_mmap,
  90        .open           = generic_file_open,
  91        .release        = ext2_release_file,
  92        .fsync          = ext2_fsync,
  93};
  94#endif
  95
  96const struct inode_operations ext2_file_inode_operations = {
  97        .truncate       = ext2_truncate,
  98#ifdef CONFIG_EXT2_FS_XATTR
  99        .setxattr       = generic_setxattr,
 100        .getxattr       = generic_getxattr,
 101        .listxattr      = ext2_listxattr,
 102        .removexattr    = generic_removexattr,
 103#endif
 104        .setattr        = ext2_setattr,
 105        .check_acl      = ext2_check_acl,
 106        .fiemap         = ext2_fiemap,
 107};
 108