linux-2.6.33/vfs_fsync_range() の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-2.6.33/vfs_fsync_range() へ行く。
• linux-2.6.33/vfs_fsync_range() の差分を削除

*参照元 [#b4d1de1b]
#backlinks

*説明 [#rc4e0286]
-パス: [[linux-2.6.33/fs/sync.c]]

-FIXME: これは何？
--説明


**引数 [#dd1c151b]
-struct file *file
--
--[[linux-2.6.33/file]]
-struct dentry *dentry
--
--[[linux-2.6.33/dentry]]
-loff_t start
--
-loff_t end
--
-int datasync
--


**返り値 [#k560a484]
-
--

**参考 [#w27d8720]


*実装 [#jc0a4d5c]
 /**
  * vfs_fsync_range - helper to sync a range of data & metadata to disk
  * @file:		file to sync
  * @dentry:		dentry of @file
  * @start:		offset in bytes of the beginning of data range to sync
  * @end:		offset in bytes of the end of data range (inclusive)
  * @datasync:		perform only datasync
  *
  * Write back data in range @start..@end and metadata for @file to disk.  If
  * @datasync is set only metadata needed to access modified file data is
  * written.
  *
  * In case this function is called from nfsd @file may be %NULL and
  * only @dentry is set.  This can only happen when the filesystem
  * implements the export_operations API.
  */
 int vfs_fsync_range(struct file *file, struct dentry *dentry, loff_t start,
 		    loff_t end, int datasync)
 {
 	const struct file_operations *fop;
 	struct address_space *mapping;
 	int err, ret;
 
-
--[[linux-2.6.33/file_operations]]
-
--[[linux-2.6.33/address_space]]

 	/*
 	 * Get mapping and operations from the file in case we have
 	 * as file, or get the default values for them in case we
 	 * don't have a struct file available.  Damn nfsd..
 	 */
 	if (file) {
 		mapping = file->f_mapping;
 		fop = file->f_op;
 	} else {
 		mapping = dentry->d_inode->i_mapping;
 		fop = dentry->d_inode->i_fop;
 	}
 
 	if (!fop || !fop->fsync) {
 		ret = -EINVAL;
 		goto out;
 	}
 
-
--[[linux-2.6.33/EINVAL]]

 	ret = filemap_write_and_wait_range(mapping, start, end);
 
-
--[[linux-2.6.33/filemap_write_and_wait_range()]]

 	/*
 	 * We need to protect against concurrent writers, which could cause
 	 * livelocks in fsync_buffers_list().
 	 */
 	mutex_lock(&mapping->host->i_mutex);
 	err = fop->fsync(file, dentry, datasync);
 	if (!ret)
 		ret = err;
 	mutex_unlock(&mapping->host->i_mutex);
 
 out:
 	return ret;
 }
 EXPORT_SYMBOL(vfs_fsync_range);
-
--[[linux-2.6.33/EXPORT_SYMBOL()]]


*コメント [#u215222c]