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| author | David Howells <dhowells@redhat.com> | 2021-10-21 09:50:10 +0200 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2022-01-07 14:42:40 +0100 |
| commit | 1f08c925e7a38002bde509e66f6f891468848511 (patch) | |
| tree | ec5e7154b391bde5c1bcde4c74d414de3d6c603c /fs/cachefiles/daemon.c | |
| parent | cachefiles: Implement culling daemon commands (diff) | |
| download | linux-1f08c925e7a38002bde509e66f6f891468848511.tar.xz linux-1f08c925e7a38002bde509e66f6f891468848511.zip | |
cachefiles: Implement backing file wrangling
Implement the wrangling of backing files, including the following pieces:
(1) Lookup and creation of a file on disk, using a tmpfile if the file
isn't yet present. The file is then opened, sized for DIO and the
file handle is attached to the cachefiles_object struct. The inode is
marked to indicate that it's in use by a kernel service.
(2) Invalidation of an object, creating a tmpfile and switching the file
pointer in the cachefiles object.
(3) Committing a file to disk, including setting the coherency xattr on it
and, if necessary, creating a hard link to it.
Note that this would be a good place to use Omar Sandoval's vfs_link()
with AT_LINK_REPLACE[1] as I may have to unlink an old file before I
can link a tmpfile into place.
(4) Withdrawal of open objects when a cache is being withdrawn or a cookie
is relinquished. This involves committing or discarding the file.
Changes
=======
ver #2:
- Fix logging of wrong error[1].
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/20211203094950.GA2480@kili/ [1]
Link: https://lore.kernel.org/r/163819644097.215744.4505389616742411239.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906949512.143852.14222856795032602080.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967158526.1823006.17482695321424642675.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021557060.640689.16373541458119269871.stgit@warthog.procyon.org.uk/ # v4
Diffstat (limited to 'fs/cachefiles/daemon.c')
| -rw-r--r-- | fs/cachefiles/daemon.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c index 985c3f3e6767..61e8740d01be 100644 --- a/fs/cachefiles/daemon.c +++ b/fs/cachefiles/daemon.c @@ -106,6 +106,7 @@ static int cachefiles_daemon_open(struct inode *inode, struct file *file) mutex_init(&cache->daemon_mutex); init_waitqueue_head(&cache->daemon_pollwq); INIT_LIST_HEAD(&cache->volumes); + INIT_LIST_HEAD(&cache->object_list); spin_lock_init(&cache->object_list_lock); /* set default caching limits |