Commit 85b08b31 authored by Baokun Li's avatar Baokun Li Committed by Christian Brauner
Browse files

netfs, fscache: export fscache_put_volume() and add fscache_try_get_volume() 



Export fscache_put_volume() and add fscache_try_get_volume()
helper function to allow cachefiles to get/put fscache_volume
via linux/fscache-cache.h.

Signed-off-by: default avatarBaokun Li <libaokun1@huawei.com>
Link: https://lore.kernel.org/r/20240628062930.2467993-2-libaokun@huaweicloud.com


Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 163eae0f

fs/netfs/fscache_volume.c

+14 −0
Original line number Diff line number Diff line
@@ -27,6 +27,19 @@ struct fscache_volume *fscache_get_volume(struct fscache_volume *volume, 
	return volume;

}



struct fscache_volume *fscache_try_get_volume(struct fscache_volume *volume,

					      enum fscache_volume_trace where)

{

	int ref;



	if (!__refcount_inc_not_zero(&volume->ref, &ref))

		return NULL;



	trace_fscache_volume(volume->debug_id, ref + 1, where);

	return volume;

}

EXPORT_SYMBOL(fscache_try_get_volume);



static void fscache_see_volume(struct fscache_volume *volume,

			       enum fscache_volume_trace where)

{
@@ -420,6 +433,7 @@ void fscache_put_volume(struct fscache_volume *volume, 
			fscache_free_volume(volume);

	}

}

EXPORT_SYMBOL(fscache_put_volume);



/*

 * Relinquish a volume representation cookie.

fs/netfs/internal.h

+0 −2
Original line number Diff line number Diff line
@@ -352,8 +352,6 @@ extern const struct seq_operations fscache_volumes_seq_ops; 


struct fscache_volume *fscache_get_volume(struct fscache_volume *volume,

					  enum fscache_volume_trace where);

void fscache_put_volume(struct fscache_volume *volume,

			enum fscache_volume_trace where);

bool fscache_begin_volume_access(struct fscache_volume *volume,

				 struct fscache_cookie *cookie,

				 enum fscache_access_trace why);

include/linux/fscache-cache.h

+6 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
enum fscache_cache_trace;

enum fscache_cookie_trace;

enum fscache_access_trace;

enum fscache_volume_trace;



enum fscache_cache_state {

	FSCACHE_CACHE_IS_NOT_PRESENT,	/* No cache is present for this name */
@@ -97,6 +98,11 @@ extern void fscache_withdraw_cookie(struct fscache_cookie *cookie); 


extern void fscache_io_error(struct fscache_cache *cache);



extern struct fscache_volume *

fscache_try_get_volume(struct fscache_volume *volume,

		       enum fscache_volume_trace where);

extern void fscache_put_volume(struct fscache_volume *volume,

			       enum fscache_volume_trace where);

extern void fscache_end_volume_access(struct fscache_volume *volume,

				      struct fscache_cookie *cookie,

				      enum fscache_access_trace why);