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 "ext2.h"
  23 #include "xattr.h"
  24 #include "acl.h"
  25
  26 /*
  27  * Called when filp is released. This happens when all file descriptors
  28  * for a single struct file are closed. Note that different open() calls
  29  * for the same file yield different struct file structures.
  30  */
  31 static int ext2_release_file (struct inode * inode, struct file * filp)
  32 {
  33         if (filp->f_mode & FMODE_WRITE) {
  34                 mutex_lock(&EXT2_I(inode)->truncate_mutex);
  35                 ext2_discard_reservation(inode);
  36                 mutex_unlock(&EXT2_I(inode)->truncate_mutex);
  37         }
  38         return 0;
  39 }
  40
  41 /*
  42  * We have mostly NULL's here: the current defaults are ok for
  43  * the ext2 filesystem.
  44  */
  45 const struct file_operations ext2_file_operations = {
  46         .llseek         = generic_file_llseek,
  47         .read           = do_sync_read,
  48         .write          = do_sync_write,
  49         .aio_read       = generic_file_aio_read,
  50         .aio_write      = generic_file_aio_write,
  51         .unlocked_ioctl = ext2_ioctl,
  52 #ifdef CONFIG_COMPAT
  53         .compat_ioctl   = ext2_compat_ioctl,
  54 #endif
  55         .mmap           = generic_file_mmap,
  56         .open           = generic_file_open,
  57         .release        = ext2_release_file,
  58         .fsync          = ext2_sync_file,
  59         .splice_read    = generic_file_splice_read,
  60         .splice_write   = generic_file_splice_write,
  61 };
  62
  63 #ifdef CONFIG_EXT2_FS_XIP
  64 const struct file_operations ext2_xip_file_operations = {
  65         .llseek         = generic_file_llseek,
  66         .read           = xip_file_read,
  67         .write          = xip_file_write,
  68         .unlocked_ioctl = ext2_ioctl,
  69 #ifdef CONFIG_COMPAT
  70         .compat_ioctl   = ext2_compat_ioctl,
  71 #endif
  72         .mmap           = xip_file_mmap,
  73         .open           = generic_file_open,
  74         .release        = ext2_release_file,
  75         .fsync          = ext2_sync_file,
  76 };
  77 #endif
  78
  79 const struct inode_operations ext2_file_inode_operations = {
  80         .truncate       = ext2_truncate,
  81 #ifdef CONFIG_EXT2_FS_XATTR
  82         .setxattr       = generic_setxattr,
  83         .getxattr       = generic_getxattr,
  84         .listxattr      = ext2_listxattr,
  85         .removexattr    = generic_removexattr,
  86 #endif
  87         .setattr        = ext2_setattr,
  88         .permission     = ext2_permission,
  89 };