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authorNeilBrown <neilb@suse.de>2006-01-06 00:20:30 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:34:05 -0800
commitd7603b7e3a7f802c67f9190b2387d4d5d111ec14 (patch)
tree7fc644f33bd6d77156387f8acddd65030b1a817d /drivers/md/bitmap.c
parent0eb3ff12aa8a12538ef681dc83f4361636a0699f (diff)
[PATCH] md: make /proc/mdstat pollable
With this patch it is possible to poll /proc/mdstat to detect arrays appearing or disappearing, to detect failures, recovery starting, recovery completing, and devices being added and removed. It is similar to the poll-ability of /proc/mounts, though different in that: We always report that the file is readable (because face it, it is, even if only for EOF). We report POLLPRI when there is a change so that select() can detect it as an exceptional event. Not only are these exceptional events, but that is the mechanism that the current 'mdadm' uses to watch for events (It also polls after a timeout). (We also report POLLERR like /proc/mounts). Finally, we only reset the per-file event counter when the start of the file is read, rather than when poll() returns an event. This is more robust as it means that an fd will continue to report activity to poll/select until the program clearly responds to that activity. md_new_event takes an 'mddev' which isn't currently used, but it will be soon. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/bitmap.c')
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