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| author | David Howells <dhowells@redhat.com> | 2021-10-21 10:55:21 +0200 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2022-01-07 14:41:53 +0100 |
| commit | fe2140e2f57fef8562e0f9b7cd447d2b08dc2f35 (patch) | |
| tree | 0ab7fb840bfbbc540a71e69848dc99dbce6f63b0 /fs/cachefiles/internal.h | |
| parent | cachefiles: Implement cache registration and withdrawal (diff) | |
| download | linux-fe2140e2f57fef8562e0f9b7cd447d2b08dc2f35.tar.xz linux-fe2140e2f57fef8562e0f9b7cd447d2b08dc2f35.zip | |
cachefiles: Implement volume support
Implement support for creating the directory layout for a volume on disk
and setting up and withdrawing volume caching.
Each volume has a directory named for the volume key under the root of the
cache (prefixed with an 'I' to indicate to cachefilesd that it's an index)
and then creates a bunch of hash bucket subdirectories under that (named as
'@' plus a hex number) in which cookie files will be created.
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/163819635314.215744.13081522301564537723.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906936397.143852.17788457778396467161.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967143860.1823006.7185205806080225038.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021545212.640689.5064821392307582927.stgit@warthog.procyon.org.uk/ # v4
Diffstat (limited to 'fs/cachefiles/internal.h')
| -rw-r--r-- | fs/cachefiles/internal.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h index 77e874c2bbe7..ab0e9307be7b 100644 --- a/fs/cachefiles/internal.h +++ b/fs/cachefiles/internal.h @@ -20,6 +20,17 @@ struct cachefiles_cache; struct cachefiles_object; /* + * Cached volume representation. + */ +struct cachefiles_volume { + struct cachefiles_cache *cache; + struct list_head cache_link; /* Link in cache->volumes */ + struct fscache_volume *vcookie; /* The netfs's representation */ + struct dentry *dentry; /* The volume dentry */ + struct dentry *fanout[256]; /* Fanout subdirs */ +}; + +/* * Data file records. */ struct cachefiles_object { @@ -35,6 +46,8 @@ struct cachefiles_cache { struct dentry *store; /* Directory into which live objects go */ struct dentry *graveyard; /* directory into which dead objects go */ struct file *cachefilesd; /* manager daemon handle */ + struct list_head volumes; /* List of volume objects */ + spinlock_t object_list_lock; /* Lock for volumes and object_list */ const struct cred *cache_cred; /* security override for accessing cache */ struct mutex daemon_mutex; /* command serialisation mutex */ wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */ @@ -164,6 +177,13 @@ static inline void cachefiles_end_secure(struct cachefiles_cache *cache, } /* + * volume.c + */ +void cachefiles_acquire_volume(struct fscache_volume *volume); +void cachefiles_free_volume(struct fscache_volume *volume); +void cachefiles_withdraw_volume(struct cachefiles_volume *volume); + +/* * Error handling */ #define cachefiles_io_error(___cache, FMT, ...) \ |