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 <linux/quotaops.h>
  24 #include "ext2.h"
  25 #include "xattr.h"
  26 #include "acl.h"
  27
  28 /*
  29  * Called when filp is released. This happens when all file descriptors
  30  * for a single struct file are closed. Note that different open() calls
  31  * for the same file yield different struct file structures.
  32  */
  33 static int ext2_release_file (struct inode * inode, struct file * filp)
  34 {
  35         if (filp->f_mode & FMODE_WRITE) {
  36                 mutex_lock(&EXT2_I(inode)->truncate_mutex);
  37                 ext2_discard_reservation(inode);
  38                 mutex_unlock(&EXT2_I(inode)->truncate_mutex);
  39         }
  40         return 0;
  41 }
  42
  43 int ext2_fsync(struct file *file, int datasync)
  44 {
  45         int ret;
  46         struct super_block *sb = file->f_mapping->host->i_sb;
  47         struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
  48
  49         ret = generic_file_fsync(file, datasync);
  50         if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
  51                 /* We don't really know where the IO error happened... */
  52                 ext2_error(sb, __func__,
  53                            "detected IO error when writing metadata buffers");
  54                 ret = -EIO;
  55         }
  56         return ret;
  57 }
  58
  59 /*
  60  * We have mostly NULL's here: the current defaults are ok for
  61  * the ext2 filesystem.
  62  */
  63 const struct file_operations ext2_file_operations = {
  64         .llseek         = generic_file_llseek,
  65         .read           = do_sync_read,
  66         .write          = do_sync_write,
  67         .aio_read       = generic_file_aio_read,
  68         .aio_write      = generic_file_aio_write,
  69         .unlocked_ioctl = ext2_ioctl,
  70 #ifdef CONFIG_COMPAT
  71         .compat_ioctl   = ext2_compat_ioctl,
  72 #endif
  73         .mmap           = generic_file_mmap,
  74         .open           = dquot_file_open,
  75         .release        = ext2_release_file,
  76         .fsync          = ext2_fsync,
  77         .splice_read    = generic_file_splice_read,
  78         .splice_write   = generic_file_splice_write,
  79 };
  80
  81 #ifdef CONFIG_EXT2_FS_XIP
  82 const struct file_operations ext2_xip_file_operations = {
  83         .llseek         = generic_file_llseek,
  84         .read           = xip_file_read,
  85         .write          = xip_file_write,
  86         .unlocked_ioctl = ext2_ioctl,
  87 #ifdef CONFIG_COMPAT
  88         .compat_ioctl   = ext2_compat_ioctl,
  89 #endif
  90         .mmap           = xip_file_mmap,
  91         .open           = dquot_file_open,
  92         .release        = ext2_release_file,
  93         .fsync          = ext2_fsync,
  94 };
  95 #endif
  96
  97 const struct inode_operations ext2_file_inode_operations = {
  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 };