Messages in this thread | | | From | "Hao-Ran Liu" <> | Subject | Some questions about page cache | Date | Fri, 24 Dec 2004 13:21:40 +0800 |
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Dear All,
I read kernel 2.6.9 page cache code and have some questions.
1. Is the call to filemap_fdatawrite() in sys_fsync() redundant? Since sys_fsync() will call file->f_op->fsync(), and, both filemap_fdatawrite()and file->f_op->fsync() (ext2, for example) eventually call do_writepages() function.
2. for ext2, the purpose of sync_mapping_buffers() is to write out all indirect blocks of an address_space, which is called by ext2_sync_file(). How do these buffers got synced when a user program called sys_sync()? I don't find any call to ext2_sync_file() by sys_sync(). If sync_mapping_buffers() is not needed for sys_sync(), then this should apply for ext2_sync_file(), too?
Regards, Hao-Ran Liu
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