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More comments about raid function property

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This commit is contained in:
Andrea Mazzoleni 2015-03-15 22:44:04 +01:00
parent eb5ac437b2
commit a424772122
1 changed files with 8 additions and 1 deletions
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9
raid/raid.c
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@ -202,6 +202,13 @@ void raid_zero(void *zero)
* The number of parities to compute is implicit in the position in the
* forwarder vector. Position at index #i, computes (#i+1) parities.
*
* All these functions give the guarantee that parities are written
* in order. First parity P, then parity Q, and so on.
* This allows to specify the same memory buffer for multiple parities
* knowning that you'll get the latest written one.
* This characteristic is used by the raid_delta_gen() function to
* avoid to damage unused parities in recovering.
*
* @nd Number of data blocks
* @size Size of the blocks pointed by @v. It must be a multipler of 64.
* @v Vector of pointers to the blocks of data and parity.
@ -328,7 +335,7 @@ void raid_delta_gen(int nr, int *id, int *ip, int nd, size_t size, void **v)
* functions able to compute only a subset of
* parities.
*
* To avoid this, we use reuse parity buffers,
* To avoid this, we reuse parity buffers,
* assuming that all the parity functions write
* parities in order.
*