nilfs2: add truncation routine of segment usage file
[linux-2.6.git] / fs / ext2 / file.c
index f5e8614..49eec94 100644 (file)
  */
 
 #include <linux/time.h>
+#include <linux/pagemap.h>
+#include <linux/quotaops.h>
 #include "ext2.h"
 #include "xattr.h"
 #include "acl.h"
 
 /*
- * Called when an inode is released. Note that this is different
- * from ext2_open_file: open gets called at every open, but release
- * gets called only when /all/ the files are closed.
+ * 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)
-               ext2_discard_prealloc (inode);
+       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, 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, 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.
  */
-struct file_operations ext2_file_operations = {
+const struct file_operations ext2_file_operations = {
        .llseek         = generic_file_llseek,
-       .read           = generic_file_read,
-       .write          = generic_file_write,
+       .read           = do_sync_read,
+       .write          = do_sync_write,
        .aio_read       = generic_file_aio_read,
        .aio_write      = generic_file_aio_write,
-       .ioctl          = ext2_ioctl,
+       .unlocked_ioctl = ext2_ioctl,
+#ifdef CONFIG_COMPAT
+       .compat_ioctl   = ext2_compat_ioctl,
+#endif
        .mmap           = generic_file_mmap,
-       .open           = generic_file_open,
+       .open           = dquot_file_open,
        .release        = ext2_release_file,
-       .fsync          = ext2_sync_file,
-       .readv          = generic_file_readv,
-       .writev         = generic_file_writev,
-       .sendfile       = generic_file_sendfile,
+       .fsync          = ext2_fsync,
+       .splice_read    = generic_file_splice_read,
+       .splice_write   = generic_file_splice_write,
 };
 
-struct inode_operations ext2_file_inode_operations = {
-       .truncate       = ext2_truncate,
+#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,
@@ -64,5 +102,6 @@ struct inode_operations ext2_file_inode_operations = {
        .removexattr    = generic_removexattr,
 #endif
        .setattr        = ext2_setattr,
-       .permission     = ext2_permission,
+       .check_acl      = ext2_check_acl,
+       .fiemap         = ext2_fiemap,
 };