2014-03-28 23:16 GMT+05:30 Rishi Agrawal <rishi.b.agrawal@xxxxxxxxx>: > Hi All, > > I want to wait in my code till the IO actually goes to the disk. > > For example > > struct buffer_head *bh=sb_bread(sb, 20) > > strcpy(bh->b_data, "Some Data"); > > /* mark and sync */ > mark_buffer_dirty(bh); > sync_dirty_buffer(bh); > > The above code only adds the bh to the request queue and returns. > My memory is very rusty. So I may be wrong. Look for what sync_filesystem does. However, there is no guarantee that the data will be actually written to disk. I have heard instances where a caching layer in the disk tells the filesystem that the data is written but the data was not written and there was a power failure and an ensuing loss of data. So from the filesystem side, you can only provide a somewhat unreliable confirmation only most of the times. > I need something > > write_buffer_to_disk(bh) > > Which will return only if the data has been written on disk. > > Please help > -- > > Regards, > Rishi Agrawal > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- Sankar P http://psankar.blogspot.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
