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5934a0caf2
Small helper function. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
43 lines
1,006 B
C
43 lines
1,006 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_BKEY_ON_STACK_H
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#define _BCACHEFS_BKEY_ON_STACK_H
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#include "bcachefs.h"
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struct bkey_on_stack {
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struct bkey_i *k;
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u64 onstack[12];
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};
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static inline void bkey_on_stack_realloc(struct bkey_on_stack *s,
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struct bch_fs *c, unsigned u64s)
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{
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if (s->k == (void *) s->onstack &&
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u64s > ARRAY_SIZE(s->onstack)) {
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s->k = mempool_alloc(&c->large_bkey_pool, GFP_NOFS);
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memcpy(s->k, s->onstack, sizeof(s->onstack));
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}
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}
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static inline void bkey_on_stack_reassemble(struct bkey_on_stack *s,
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struct bch_fs *c,
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struct bkey_s_c k)
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{
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bkey_on_stack_realloc(s, c, k.k->u64s);
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bkey_reassemble(s->k, k);
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}
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static inline void bkey_on_stack_init(struct bkey_on_stack *s)
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{
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s->k = (void *) s->onstack;
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}
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static inline void bkey_on_stack_exit(struct bkey_on_stack *s,
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struct bch_fs *c)
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{
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if (s->k != (void *) s->onstack)
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mempool_free(s->k, &c->large_bkey_pool);
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s->k = NULL;
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}
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#endif /* _BCACHEFS_BKEY_ON_STACK_H */
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