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Fixes the equation notations.

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Andrea Mazzoleni 2013-09-09 22:13:44 +02:00
parent 05bf1b5106
commit 32130a4bdf
1 changed files with 15 additions and 15 deletions
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30
raid.c
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@ -856,8 +856,8 @@ void raid_gen(unsigned level, unsigned char** buffer, unsigned diskmax, unsigned
* we can sum these two set equations, obtaining:
*
* Pd = Dx + Dy + Dz
* Qd = 2^x * Dx + 2^y * Dy + 2^y * Dz
* Rd = 4^x * Dx + 4^y * Dy + 4^y * Dz
* Qd = 2^x * Dx + 2^y * Dy + 2^z * Dz
* Rd = 4^x * Dx + 4^y * Dy + 4^z * Dz
*
* A linear system of three equations solvable by substitution on Dx, Dy and Dz,
* because all the others variables are known and the equations are independent
@ -884,7 +884,7 @@ void raid_gen(unsigned level, unsigned char** buffer, unsigned diskmax, unsigned
* References:
* [1] H. Peter Anvin, "The mathematics of RAID-6", 2004
* [2] David Brown, "Multiple-parity RAID", 2011
* [3] James S. Plank, "A Tutorial on Reed-Solomon Coding for Fault-Tolerance in RAID-like Systems"
* [3] James S. Plank, "A Tutorial on Reed-Solomon Coding for Fault-Tolerance in RAID-like Systems", 1999
* [4] James S. Plank, Ying Ding, "Note: Correction to the 1997 Tutorial on Reed-Solomon Coding", 2003
*/
@ -952,7 +952,7 @@ static inline const unsigned char* table(unsigned char a)
/*
* Starting from the equation:
*
* Dx = Pd
* Pd = Dx
*
* and solving we get:
*
@ -980,8 +980,8 @@ void raid5_recov_data(unsigned char** dptrs, unsigned diskmax, unsigned size, in
/*
* Starting from the equations:
*
* Dx + Dy = Pd
* 2^x * Dx + 2^y * Dy = Qd
* Pd = Dx + Dy
* Qd = 2^x * Dx + 2^y * Dy
*
* and solving we get:
*
@ -1060,7 +1060,7 @@ void raid6_recov_2data(unsigned char** dptrs, unsigned diskmax, unsigned size, i
/*
* Starting from the equations:
*
* 2^x * Dx = Qd
* Qd = 2^x * Dx
*
* and solving we get:
*
@ -1116,7 +1116,7 @@ void raid6_recov_datap(unsigned char** dptrs, unsigned diskmax, unsigned size, i
/*
* Starting from the equation:
*
* 4^x * Dx = Rd
* Rd = 4^x * Dx
*
* and solving we get:
*
@ -1173,8 +1173,8 @@ void raidTP_recov_datapq(unsigned char** dptrs, unsigned diskmax, unsigned size,
/*
* Starting from the equations:
*
* Dx + Dy = Pd
* 4^x * Dx + 4^y * Dy = Rd
* Pd = Dx + Dy
* Rd = 4^x * Dx + 4^y * Dy
*
* and solving we get:
*
@ -1255,8 +1255,8 @@ void raidTP_recov_2dataq(unsigned char** dptrs, unsigned diskmax, unsigned size,
/*
* Starting from the equations:
*
* 2^x * Dx + 2^y * Dy = Qd
* 4^x * Dx + 4^y * Dy = Rd
* Qd = 2^x * Dx + 2^y * Dy
* Rd = 4^x * Dx + 4^y * Dy
*
* and solving we get:
*
@ -1346,9 +1346,9 @@ void raidTP_recov_2datap(unsigned char** dptrs, unsigned diskmax, unsigned size,
/*
* Starting from the equations:
*
* Dx + Dy + Dz = Pd
* 2^x * Dx + 2^y * Dy + 2^z * Dz = Qd
* 4^x * Dx + 4^y * Dy + 4^z * Dz = Rd
* Pd = Dx + Dy + Dz
* Qd = 2^x * Dx + 2^y * Dy + 2^z * Dz
* Rd = 4^x * Dx + 4^y * Dy + 4^z * Dz
*
* and solving we get:
*