David Howells 93c846143d 9p: Copy local writes to the cache when writing to the server ... When writing to the server from v9fs_vfs_writepage(), copy the data to the cache object too. To make this possible, the cookie must have its active users count incremented when the page is dirtied and kept incremented until we manage to clean up all the pages. This allows the writeback to take place after the last file struct is released. This is done by taking a use on the cookie in v9fs_set_page_dirty() if we haven't already done so (controlled by the I_PINNING_FSCACHE_WB flag) and dropping the pin in v9fs_write_inode() if __writeback_single_inode() clears all the outstanding dirty pages (conveyed by the unpinned_fscache_wb flag in the writeback_control struct). Inode eviction must also clear the flag after truncating away all the outstanding pages. In the future this will be handled more gracefully by netfslib. Changes ======= ver #3: - Canonicalise the coherency data to make it endianness-independent. ver #2: - Fix an unused-var warning due to CONFIG_9P_FSCACHE=n[1]. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Jeff Layton <jlayton@kernel.org> Tested-by: Dominique Martinet <asmadeus@codewreck.org> cc: Eric Van Hensbergen <ericvh@gmail.com> cc: Latchesar Ionkov <lucho@ionkov.net> cc: v9fs-developer@lists.sourceforge.net cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/163819667027.215744.13815687931204222995.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/163906978015.143852.10646669694345706328.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/163967180760.1823006.5831751873616248910.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/164021574522.640689.13849966660182529125.stgit@warthog.procyon.org.uk/ # v4		2022-01-10 11:53:25 +00:00
..
Kconfig	9p: Use fscache indexing rewrite and reenable caching	2022-01-10 11:53:06 +00:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
acl.c	9p: fix a bunch of checkpatch warnings	2021-11-04 21:04:25 +09:00
acl.h	9p: fix a bunch of checkpatch warnings	2021-11-04 21:04:25 +09:00
cache.c	9p: Use fscache indexing rewrite and reenable caching	2022-01-10 11:53:06 +00:00
cache.h	9p: Use fscache indexing rewrite and reenable caching	2022-01-10 11:53:06 +00:00
fid.c	fs/9p: fix indentation and Add missing a blank line after declaration	2021-11-03 17:45:03 +09:00
fid.h	9p: apply review requests for fid refcounting	2020-11-19 17:21:34 +01:00
v9fs.c	9p: Use fscache indexing rewrite and reenable caching	2022-01-10 11:53:06 +00:00
v9fs.h	9p: Use fscache indexing rewrite and reenable caching	2022-01-10 11:53:06 +00:00
v9fs_vfs.h	9p: fix a bunch of checkpatch warnings	2021-11-04 21:04:25 +09:00
vfs_addr.c	9p: Copy local writes to the cache when writing to the server	2022-01-10 11:53:25 +00:00
vfs_dentry.c	9p: fix a bunch of checkpatch warnings	2021-11-04 21:04:25 +09:00
vfs_dir.c	9p: Use fscache indexing rewrite and reenable caching	2022-01-10 11:53:06 +00:00
vfs_file.c	9p: Use fscache indexing rewrite and reenable caching	2022-01-10 11:53:06 +00:00
vfs_inode.c	9p: Copy local writes to the cache when writing to the server	2022-01-10 11:53:25 +00:00
vfs_inode_dotl.c	9p: Use fscache indexing rewrite and reenable caching	2022-01-10 11:53:06 +00:00
vfs_super.c	9p: Copy local writes to the cache when writing to the server	2022-01-10 11:53:25 +00:00
xattr.c	9p: fix file headers	2021-11-03 17:45:04 +09:00
xattr.h	9p: fix a bunch of checkpatch warnings	2021-11-04 21:04:25 +09:00