On 27.01.2012 20:04, Phillip Susi wrote:
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On 1/27/2012 8:28 AM, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
Hello, all. When someone installs using blocklists (discouraged
and unreliable), we use GRUB internal fs reader in order to
determine core.img blocklists. With Linux we call fsync and an
ioctl on partition in order to flush the cache. I also tried adding
"sync" which didn't make any difference. Unfortunately it doesn't
seem to be good enough on
By "sync" you mean running the sync command?
Actually the sync () call
If so, that absolutely,
positively should flush everything to disk. If it isn't then there's
a major kernel bug. An fsync() on the core.img file ( not the
partition device ) also should flush everything needed to find that
file, without flushing everything else that isn't.
I'll recheck. But considering that I ran into some data loss it's
possible that I have some kind of hardware or software failure (most
likely because of new kernel and xen tests). Busy now doing the backups
in case it gets worse
Doing an fsync() on the partition device will flush buffers from a
process directly opening the block dev and performing IO there, not
the buffers for files within the filesystem on that block device.
IIRC, ext2 uses the block buffers for directory access so that
partition fsync will flush directories, but ext3 and ext4 do not.
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Regards
Vladimir 'φ-coder/phcoder' Serbinenko
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