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287fd61123
Implement the methods for beginning and ending an I/O operation. When called to begin an I/O operation, we are guaranteed that the cookie has reached a certain stage (we're called by fscache after it has done a suitable wait). If a file is available, we paste a ref over into the cache resources for the I/O routines to use. This means that the object can be invalidated whilst the I/O is ongoing without the need to synchronise as the file pointer in the object is replaced, but the file pointer in the cache resources is unaffected. Ending the operation just requires ditching any refs we have and dropping the access guarantee that fscache got for us on the cookie. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/163819645033.215744.2199344081658268312.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/163906951916.143852.9531384743995679857.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/163967161222.1823006.4461476204800357263.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/164021559030.640689.3684291785218094142.stgit@warthog.procyon.org.uk/ # v4
20 lines
325 B
Makefile
20 lines
325 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for caching in a mounted filesystem
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#
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cachefiles-y := \
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cache.o \
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daemon.o \
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interface.o \
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io.o \
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key.o \
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main.o \
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namei.o \
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security.o \
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volume.o \
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xattr.o
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cachefiles-$(CONFIG_CACHEFILES_ERROR_INJECTION) += error_inject.o
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obj-$(CONFIG_CACHEFILES) := cachefiles.o
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