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A rolling buffer is a series of folios held in a list of folio_queues. New folios and folio_queue structs may be inserted at the head simultaneously with spent ones being removed from the tail without the need for locking. The rolling buffer includes an iov_iter and it has to be careful managing this as the list of folio_queues is extended such that an oops doesn't incurred because the iterator was pointing to the end of a folio_queue segment that got appended to and then removed. We need to use the mechanism twice, once for read and once for write, and, in future patches, we will use a second rolling buffer to handle bounce buffering for content encryption. Signed-off-by: David Howells <dhowells@redhat.com> Link: https://lore.kernel.org/r/20241216204124.3752367-6-dhowells@redhat.com cc: Jeff Layton <jlayton@kernel.org> cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner <brauner@kernel.org>
35 lines
615 B
Makefile
35 lines
615 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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netfs-y := \
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buffered_read.o \
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buffered_write.o \
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direct_read.o \
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direct_write.o \
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iterator.o \
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locking.o \
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main.o \
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misc.o \
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objects.o \
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read_collect.o \
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read_pgpriv2.o \
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read_retry.o \
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rolling_buffer.o \
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write_collect.o \
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write_issue.o
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netfs-$(CONFIG_NETFS_STATS) += stats.o
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netfs-$(CONFIG_FSCACHE) += \
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fscache_cache.o \
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fscache_cookie.o \
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fscache_io.o \
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fscache_main.o \
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fscache_volume.o
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ifeq ($(CONFIG_PROC_FS),y)
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netfs-$(CONFIG_FSCACHE) += fscache_proc.o
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endif
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netfs-$(CONFIG_FSCACHE_STATS) += fscache_stats.o
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obj-$(CONFIG_NETFS_SUPPORT) += netfs.o
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