file.c

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/*
 *  linux/fs/ext2/file.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card ([email protected])
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/file.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  ext2 fs regular file handling primitives
 *
 *  64-bit file support on 64-bit platforms by Jakub Jelinek
 *  ([email protected])
 */

#include <linux/time.h>
#include <linux/pagemap.h>
#include <linux/quotaops.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"

/*
 * Called when filp is released. This happens when all file descriptors
 * for a single struct file are closed. Note that different open() calls
 * for the same file yield different struct file structures.
 */
static int ext2_release_file (struct inode * inode, struct file * filp)
{
    if (filp->f_mode & FMODE_WRITE) {
        mutex_lock(&EXT2_I(inode)->truncate_mutex);
        ext2_discard_reservation(inode);
        mutex_unlock(&EXT2_I(inode)->truncate_mutex);
    }
    return 0;
}

int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
    int ret;
    struct super_block *sb = file->f_mapping->host->i_sb;
    struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;

    ret = generic_file_fsync(file, start, end, datasync);
    if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
        /* We don't really know where the IO error happened... */
        ext2_error(sb, __func__,
               "detected IO error when writing metadata buffers");
        ret = -EIO;
    }
    return ret;
}

/*
 * We have mostly NULL's here: the current defaults are ok for
 * the ext2 filesystem.
 */
const struct file_operations ext2_file_operations = {
    .llseek     = generic_file_llseek,
    .read       = do_sync_read,
    .write      = do_sync_write,
    .aio_read   = generic_file_aio_read,
    .aio_write  = generic_file_aio_write,
    .unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
    .compat_ioctl   = ext2_compat_ioctl,
#endif
    .mmap       = generic_file_mmap,
    .open       = dquot_file_open,
    .release    = ext2_release_file,
    .fsync      = ext2_fsync,
    .splice_read    = generic_file_splice_read,
    .splice_write   = generic_file_splice_write,
};

#ifdef CONFIG_EXT2_FS_XIP
const struct file_operations ext2_xip_file_operations = {
    .llseek     = generic_file_llseek,
    .read       = xip_file_read,
    .write      = xip_file_write,
    .unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
    .compat_ioctl   = ext2_compat_ioctl,
#endif
    .mmap       = xip_file_mmap,
    .open       = dquot_file_open,
    .release    = ext2_release_file,
    .fsync      = ext2_fsync,
};
#endif

const struct inode_operations ext2_file_inode_operations = {
#ifdef CONFIG_EXT2_FS_XATTR
    .setxattr   = generic_setxattr,
    .getxattr   = generic_getxattr,
    .listxattr  = ext2_listxattr,
    .removexattr    = generic_removexattr,
#endif
    .setattr    = ext2_setattr,
    .get_acl    = ext2_get_acl,
    .fiemap     = ext2_fiemap,
};