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drbd: Backport the "status" command

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The status command originates the drbd9 code base. While for now we
keep the status information in /proc/drbd available, this commit
allows the user base to gracefully migrate their monitoring
infrastructure to the new status reporting interface.

In drbd9 no status information is exposed through /proc/drbd.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Andreas Gruenbacher 2014-08-28 13:31:14 +02:00 • committed by Jens Axboe
commit a55bbd375d
3 changed files with 536 additions and 79 deletions
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14
include/linux/idr.h
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@ -135,6 +135,20 @@ static inline void *idr_find(struct idr *idr, int id)
#define idr_for_each_entry(idp, entry, id) \
for (id = 0; ((entry) = idr_get_next(idp, &(id))) != NULL; ++id)
/**
* idr_for_each_entry - continue iteration over an idr's elements of a given type
* @idp: idr handle
* @entry: the type * to use as cursor
* @id: id entry's key
*
* Continue to iterate over list of given type, continuing after
* the current position.
*/
#define idr_for_each_entry_continue(idp, entry, id) \
for ((entry) = idr_get_next((idp), &(id)); \
entry; \
++id, (entry) = idr_get_next((idp), &(id)))
/*
* IDA - IDR based id allocator, use when translation from id to
* pointer isn't necessary.