[Bug 30640] Re: Displayed progress not correct due to kernel fs cache. Need O_SYNC when copying files.

[Phillip Susi]

Actually now in Maverick when I try this, the copy reaches 100% then
sits there for several seconds while it appears that an fsync is done to
flush the cache.  I think that solves the original problem, though it
would be nice if the progress did not reach 100% prematurely and then
wait for the sync.


** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

** Changed in: nautilus (Ubuntu)
   Importance: Low => Wishlist

** Description changed:

- When copying files to an usb stick the progress is not displayed
- correctly. The progress bar shows that it is finished but when plugging
- the usb stick out and in the files are not on the usb stick. When
- waiting for some time after copying the files the files are really on
- the stick.
- 
- This problem is especially acute for slow usb sticks, but the progress
- bar is wrong in all cases since it is only reporting progress of the
- kernel to accept the writes into its cache.  Nautilus should use O_SYNC
- on the destination file so it will be informed of the progress properly.
+ While copying files, the progress bar is wrong in all cases since it is
+ only reporting progress of the kernel to accept the writes into its
+ cache.  As a result, it reaches 100% before the copy is actually
+ finished, and then appears to wait for an fsync before going away.
+ Nautilus should use O_SYNC on the destination file so it will be
+ informed of the progress properly.

-- 
Displayed progress not correct due to kernel fs cache.  Need O_SYNC when copying files.
https://bugs.launchpad.net/bugs/30640
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