On Mar 30, 2009, at 5:01 PM, Eric Sandeen wrote:
[PATCH] writeback: guard against jiffies wraparound on
The "jiffies wraparound" sounds very familiar, but I
thought it's been fixed ages ago.
When a file is continually dirtied, the check in sync_sb_inodes:
/* Was this inode dirtied after sync_sb_inodes was called? */
if (time_after(inode->dirtied_when, start))
may have large windows where this trips on the first
(continually-dirtied) inode on the list when the time_after check has
wrapped, causing the nothing to be written out for that superblock,
potentially for days.
Could this be the reason for those various "hey, my file disappeared
after a crash and I hadn't written to it for *days*" reports we got
and then, leaving us all scratching our heads?
The "jiffies wraparound" could definitely cause this.
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