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rslib: Add GFP aware init function

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The rslib usage in dm/verity_fec is broken because init_rs() can nest in
GFP_NOIO mempool allocations as init_rs() is invoked from the mempool alloc
callback.

Provide a variant which takes gfp_t flags as argument.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Alasdair Kergon <agk@redhat.com>
Cc: Neil Brown <neilb@suse.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Thomas Gleixner
2018-04-22 18:23:46 +02:00
committed by Kees Cook
parent 6d08b06e67
commit 83a530e161
2 changed files with 48 additions and 23 deletions
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28
include/linux/rslib.h
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@@ -20,6 +20,8 @@
#define _RSLIB_H_
#include <linux/list.h>
#include <linux/types.h> /* for gfp_t */
#include <linux/gfp.h> /* for GFP_KERNEL */
/**
* struct rs_control - rs control structure
@@ -77,10 +79,30 @@ int decode_rs16(struct rs_control *rs, uint16_t *data, uint16_t *par, int len,
#endif
/* Create or get a matching rs control structure */
struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim,
int nroots);
struct rs_control *init_rs_gfp(int symsize, int gfpoly, int fcr, int prim,
int nroots, gfp_t gfp);
/**
* init_rs - Create a RS control struct and initialize it
* @symsize: the symbol size (number of bits)
* @gfpoly: the extended Galois field generator polynomial coefficients,
* with the 0th coefficient in the low order bit. The polynomial
* must be primitive;
* @fcr: the first consecutive root of the rs code generator polynomial
* in index form
* @prim: primitive element to generate polynomial roots
* @nroots: RS code generator polynomial degree (number of roots)
*
* Allocations use GFP_KERNEL.
*/
static inline struct rs_control *init_rs(int symsize, int gfpoly, int fcr,
int prim, int nroots)
{
return init_rs_gfp(symsize, gfpoly, fcr, prim, nroots, GFP_KERNEL);
}
struct rs_control *init_rs_non_canonical(int symsize, int (*func)(int),
int fcr, int prim, int nroots);
int fcr, int prim, int nroots);
/* Release a rs control structure */
void free_rs(struct rs_control *rs);