From: Christoph Hellwig [mailto:hch@xxxxxxxxxxxxx] : > On Thu, Sep 01, 2011 at 06:12:51PM +0000, Berthier, Emmanuel wrote: > > I've checked with traces that the issue is upper eMMC block driver. > > What do you mean with this sentence? > > Does your problem reproduce without eMMC in the game? Does writing > directly to the block device and then fsync the data get it to disk? Thanks for the answer. I've patches the mmcd block driver in order to catch the start and the end of the written file, so I can detect when the flush is completed. I've reproduced the issue on a PC with Ubuntu 10.04, but as the SSD drive contains cache, it's clear that this configuration can't guaranty the immediate flushing of the file on the flash memory. A new info of today: the issue disappears if I call fflush() before fsync(): all the file is well flushed at a time. The problem is that this is not the behavior of Sqlite3.6.2 (I've trace sys calls with strace, no fflush() on journal) (same for last 3.7.7.1). Who's wrong? FS or Sqlite? --------------------------------------------------------------------- Intel Corporation SAS (French simplified joint stock company) Registered headquarters: "Les Montalets"- 2, rue de Paris, 92196 Meudon Cedex, France Registration Number: 302 456 199 R.C.S. NANTERRE Capital: 4,572,000 Euros This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
