Commit 8390fbc4 authored by David Howells's avatar David Howells
Browse files

cachefiles: Define structs 



Define the cachefiles_cache struct that's going to carry the cache-level
parameters and state of a cache.

Define the beginning of the cachefiles_object struct that's going to carry
the state for a data storage object.  For the moment this is just a
debugging ID for logging purposes.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/163819623690.215744.2824739137193655547.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906924292.143852.15881439716653984905.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967131405.1823006.4480555941533935597.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021530610.640689.846094074334176928.stgit@warthog.procyon.org.uk/ # v4
parent 77443f61

fs/cachefiles/internal.h

+46 −0
Original line number Diff line number Diff line
@@ -16,6 +16,52 @@ 
#include <linux/cred.h>

#include <linux/security.h>



struct cachefiles_cache;

struct cachefiles_object;



/*

 * Data file records.

 */

struct cachefiles_object {

	int				debug_id;	/* debugging ID */

};



/*

 * Cache files cache definition

 */

struct cachefiles_cache {

	struct vfsmount			*mnt;		/* mountpoint holding the cache */

	struct file			*cachefilesd;	/* manager daemon handle */

	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 */

	atomic_t			gravecounter;	/* graveyard uniquifier */

	atomic_t			f_released;	/* number of objects released lately */

	atomic_long_t			b_released;	/* number of blocks released lately */

	unsigned			frun_percent;	/* when to stop culling (% files) */

	unsigned			fcull_percent;	/* when to start culling (% files) */

	unsigned			fstop_percent;	/* when to stop allocating (% files) */

	unsigned			brun_percent;	/* when to stop culling (% blocks) */

	unsigned			bcull_percent;	/* when to start culling (% blocks) */

	unsigned			bstop_percent;	/* when to stop allocating (% blocks) */

	unsigned			bsize;		/* cache's block size */

	unsigned			bshift;		/* min(ilog2(PAGE_SIZE / bsize), 0) */

	uint64_t			frun;		/* when to stop culling */

	uint64_t			fcull;		/* when to start culling */

	uint64_t			fstop;		/* when to stop allocating */

	sector_t			brun;		/* when to stop culling */

	sector_t			bcull;		/* when to start culling */

	sector_t			bstop;		/* when to stop allocating */

	unsigned long			flags;

#define CACHEFILES_READY		0	/* T if cache prepared */

#define CACHEFILES_DEAD			1	/* T if cache dead */

#define CACHEFILES_CULLING		2	/* T if cull engaged */

#define CACHEFILES_STATE_CHANGED	3	/* T if state changed (poll trigger) */

	char				*rootdirname;	/* name of cache root directory */

	char				*secctx;	/* LSM security context */

	char				*tag;		/* cache binding tag */

};





/*

 * Debug tracing.