vasilito
dc68054305
- Restore 29 recipe symlinks (libdrm, qtbase, dbus, sddm, pipewire, etc.) - Restore 33 patches (KDE, libdrm, mesa, pipewire, sddm, wireplumber) - Restore 20+ local/scripts (audit, lint, test, build helpers) - Restore src/cook/scheduler.rs, status.rs, gnu-config/ - Restore scripts/patch-inclusion-gate.sh, run_mini1.sh, validate-collision-log.sh - Recover TLC source from HEAD (was overwritten by 0.2.3 checkout) - Recover 11 local/docs plans from HEAD (were overwritten) - Recover qt6-wayland-smoke symlink from HEAD - Fix MOTD: remove garbled ASCII art, use clean text - Update version: 0.2.0 -> 0.2.4 in os-release, motd, config - Reduce filesystem_size: 1536 -> 512 MiB - Add ABSOLUTE RULE to AGENTS.md: never delete/ignore packages - Reduce pcid scheme log verbosity: info -> debug
62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* Rolling buffer of folios
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*
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* Copyright (C) 2024 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#ifndef _ROLLING_BUFFER_H
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#define _ROLLING_BUFFER_H
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#include <linux/folio_queue.h>
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#include <linux/uio.h>
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/*
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* Rolling buffer. Whilst the buffer is live and in use, folios and folio
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* queue segments can be added to one end by one thread and removed from the
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* other end by another thread. The buffer isn't allowed to be empty; it must
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* always have at least one folio_queue in it so that neither side has to
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* modify both queue pointers.
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*
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* The iterator in the buffer is extended as buffers are inserted. It can be
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* snapshotted to use a segment of the buffer.
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*/
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struct rolling_buffer {
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struct folio_queue *head; /* Producer's insertion point */
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struct folio_queue *tail; /* Consumer's removal point */
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struct iov_iter iter; /* Iterator tracking what's left in the buffer */
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u8 next_head_slot; /* Next slot in ->head */
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u8 first_tail_slot; /* First slot in ->tail */
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};
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/*
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* Snapshot of a rolling buffer.
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*/
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struct rolling_buffer_snapshot {
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struct folio_queue *curr_folioq; /* Queue segment in which current folio resides */
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unsigned char curr_slot; /* Folio currently being read */
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unsigned char curr_order; /* Order of folio */
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};
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/* Marks to store per-folio in the internal folio_queue structs. */
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#define ROLLBUF_MARK_1 BIT(0)
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#define ROLLBUF_MARK_2 BIT(1)
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int rolling_buffer_init(struct rolling_buffer *roll, unsigned int rreq_id,
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unsigned int direction);
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int rolling_buffer_make_space(struct rolling_buffer *roll);
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ssize_t rolling_buffer_load_from_ra(struct rolling_buffer *roll,
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struct readahead_control *ractl,
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struct folio_batch *put_batch);
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ssize_t rolling_buffer_append(struct rolling_buffer *roll, struct folio *folio,
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unsigned int flags);
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struct folio_queue *rolling_buffer_delete_spent(struct rolling_buffer *roll);
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void rolling_buffer_clear(struct rolling_buffer *roll);
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static inline void rolling_buffer_advance(struct rolling_buffer *roll, size_t amount)
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{
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iov_iter_advance(&roll->iter, amount);
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}
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#endif /* _ROLLING_BUFFER_H */
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