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a420eea689
This way the last mount time is actually meaningful instead of just being various times from 1970 (which happens with the monotonic clock). Also, roundup_pow_of_two() is undefined when passed in 0, so check before calling it. Signed-off-by: Tim Schlueter <schlueter.tim@linux.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_FIFO_H
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#define _BCACHEFS_FIFO_H
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#include "util.h"
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#define FIFO(type) \
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struct { \
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size_t front, back, size, mask; \
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type *data; \
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}
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#define DECLARE_FIFO(type, name) FIFO(type) name
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#define fifo_buf_size(fifo) \
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((fifo)->size \
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? roundup_pow_of_two((fifo)->size) * sizeof((fifo)->data[0]) \
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: 0)
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#define init_fifo(fifo, _size, _gfp) \
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({ \
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(fifo)->front = (fifo)->back = 0; \
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(fifo)->size = (_size); \
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(fifo)->mask = (fifo)->size \
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? roundup_pow_of_two((fifo)->size) - 1 \
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: 0; \
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(fifo)->data = kvpmalloc(fifo_buf_size(fifo), (_gfp)); \
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})
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#define free_fifo(fifo) \
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do { \
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kvpfree((fifo)->data, fifo_buf_size(fifo)); \
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(fifo)->data = NULL; \
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} while (0)
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#define fifo_swap(l, r) \
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do { \
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swap((l)->front, (r)->front); \
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swap((l)->back, (r)->back); \
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swap((l)->size, (r)->size); \
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swap((l)->mask, (r)->mask); \
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swap((l)->data, (r)->data); \
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} while (0)
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#define fifo_move(dest, src) \
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do { \
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typeof(*((dest)->data)) _t; \
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while (!fifo_full(dest) && \
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fifo_pop(src, _t)) \
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fifo_push(dest, _t); \
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} while (0)
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#define fifo_used(fifo) (((fifo)->back - (fifo)->front))
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#define fifo_free(fifo) ((fifo)->size - fifo_used(fifo))
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#define fifo_empty(fifo) ((fifo)->front == (fifo)->back)
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#define fifo_full(fifo) (fifo_used(fifo) == (fifo)->size)
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#define fifo_peek_front(fifo) ((fifo)->data[(fifo)->front & (fifo)->mask])
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#define fifo_peek_back(fifo) ((fifo)->data[((fifo)->back - 1) & (fifo)->mask])
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#define fifo_entry_idx_abs(fifo, p) \
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((((p) >= &fifo_peek_front(fifo) \
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? (fifo)->front : (fifo)->back) & ~(fifo)->mask) + \
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(((p) - (fifo)->data)))
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#define fifo_entry_idx(fifo, p) (((p) - &fifo_peek_front(fifo)) & (fifo)->mask)
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#define fifo_idx_entry(fifo, i) (fifo)->data[((fifo)->front + (i)) & (fifo)->mask]
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#define fifo_push_back_ref(f) \
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(fifo_full((f)) ? NULL : &(f)->data[(f)->back++ & (f)->mask])
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#define fifo_push_front_ref(f) \
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(fifo_full((f)) ? NULL : &(f)->data[--(f)->front & (f)->mask])
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#define fifo_push_back(fifo, new) \
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({ \
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typeof((fifo)->data) _r = fifo_push_back_ref(fifo); \
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if (_r) \
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*_r = (new); \
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_r != NULL; \
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})
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#define fifo_push_front(fifo, new) \
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({ \
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typeof((fifo)->data) _r = fifo_push_front_ref(fifo); \
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if (_r) \
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*_r = (new); \
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_r != NULL; \
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})
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#define fifo_pop_front(fifo, i) \
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({ \
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bool _r = !fifo_empty((fifo)); \
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if (_r) \
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(i) = (fifo)->data[(fifo)->front++ & (fifo)->mask]; \
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_r; \
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})
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#define fifo_pop_back(fifo, i) \
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({ \
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bool _r = !fifo_empty((fifo)); \
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if (_r) \
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(i) = (fifo)->data[--(fifo)->back & (fifo)->mask] \
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_r; \
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})
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#define fifo_push_ref(fifo) fifo_push_back_ref(fifo)
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#define fifo_push(fifo, i) fifo_push_back(fifo, (i))
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#define fifo_pop(fifo, i) fifo_pop_front(fifo, (i))
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#define fifo_peek(fifo) fifo_peek_front(fifo)
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#define fifo_for_each_entry(_entry, _fifo, _iter) \
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for (typecheck(typeof((_fifo)->front), _iter), \
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(_iter) = (_fifo)->front; \
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((_iter != (_fifo)->back) && \
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(_entry = (_fifo)->data[(_iter) & (_fifo)->mask], true)); \
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(_iter)++)
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#define fifo_for_each_entry_ptr(_ptr, _fifo, _iter) \
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for (typecheck(typeof((_fifo)->front), _iter), \
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(_iter) = (_fifo)->front; \
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((_iter != (_fifo)->back) && \
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(_ptr = &(_fifo)->data[(_iter) & (_fifo)->mask], true)); \
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(_iter)++)
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#endif /* _BCACHEFS_FIFO_H */
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