Thread (12 messages) 12 messages, 5 authors, 2017-06-27

Re: [PATCH] ext4: Return EIO on read error in ext4_find_entry

From: Pavel Machek <hidden>
Date: 2017-06-27 21:58:14
Also in: lkml

Hi!
quoted
quoted
quoted
Previously, a read error would be ignored and we would eventually return
NULL from ext4_find_entry, which signals "no such file or directory". We
should be returning EIO.

Signed-off-by: Khazhismel Kumykov <redacted>
Thanks, applied.
I don't necessarily agree that this is an improvement. 

If the requested entry is not in the bad block, this will return an
error even if the file name could be found in another block. It
would be better to save the error until the end and only return -EIO
if the entry cannot be found.
The problem is that if we continue, successive reads may all take
seconds or minutes to fail, thus tieing up the process for a long
time.  If this process happens to be, say, the node's Kubernetes
management server it can take down the entire node (since if there
...
By returning EIO right away, we can "fast fail".
Well, OTOH if I have a bad flash, and get EIO trying to read
~/my-disertation-thesis.tex because ~/.emacs could not be read... I'll be
quite unhappy.

Yes, fast fail is nice when you have redundant machines, but can be a
problem otherwise.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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