Commit b02c602f authored by Jeffle Xu's avatar Jeffle Xu Committed by Gao Xiang
Browse files

erofs: add fscache context helper functions 



Introduce a context structure for managing data blobs, and helper
functions for initializing and cleaning up this context structure.

Signed-off-by: default avatarJeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220425122143.56815-13-jefflexu@linux.alibaba.com


Acked-by: default avatarChao Yu <chao@kernel.org>
Signed-off-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
parent c6be2bd0

fs/erofs/fscache.c

+41 −0
Original line number Diff line number Diff line
@@ -5,6 +5,47 @@ 
#include <linux/fscache.h>

#include "internal.h"



int erofs_fscache_register_cookie(struct super_block *sb,

				  struct erofs_fscache **fscache, char *name)

{

	struct fscache_volume *volume = EROFS_SB(sb)->volume;

	struct erofs_fscache *ctx;

	struct fscache_cookie *cookie;



	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);

	if (!ctx)

		return -ENOMEM;



	cookie = fscache_acquire_cookie(volume, FSCACHE_ADV_WANT_CACHE_SIZE,

					name, strlen(name), NULL, 0, 0);

	if (!cookie) {

		erofs_err(sb, "failed to get cookie for %s", name);

		kfree(name);

		return -EINVAL;

	}



	fscache_use_cookie(cookie, false);

	ctx->cookie = cookie;



	*fscache = ctx;

	return 0;

}



void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache)

{

	struct erofs_fscache *ctx = *fscache;



	if (!ctx)

		return;



	fscache_unuse_cookie(ctx->cookie, NULL, NULL);

	fscache_relinquish_cookie(ctx->cookie, false);

	ctx->cookie = NULL;



	kfree(ctx);

	*fscache = NULL;

}



int erofs_fscache_register_fs(struct super_block *sb)

{

	struct erofs_sb_info *sbi = EROFS_SB(sb);

fs/erofs/internal.h

+19 −0
Original line number Diff line number Diff line
@@ -97,6 +97,10 @@ struct erofs_sb_lz4_info { 
	u16 max_pclusterblks;

};



struct erofs_fscache {

	struct fscache_cookie *cookie;

};



struct erofs_sb_info {

	struct erofs_mount_opts opt;	/* options */

#ifdef CONFIG_EROFS_FS_ZIP
@@ -601,12 +605,27 @@ static inline int z_erofs_load_lzma_config(struct super_block *sb, 
#ifdef CONFIG_EROFS_FS_ONDEMAND

int erofs_fscache_register_fs(struct super_block *sb);

void erofs_fscache_unregister_fs(struct super_block *sb);



int erofs_fscache_register_cookie(struct super_block *sb,

				  struct erofs_fscache **fscache, char *name);

void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache);

#else

static inline int erofs_fscache_register_fs(struct super_block *sb)

{

	return 0;

}

static inline void erofs_fscache_unregister_fs(struct super_block *sb) {}



static inline int erofs_fscache_register_cookie(struct super_block *sb,

						struct erofs_fscache **fscache,

						char *name)

{

	return -EOPNOTSUPP;

}



static inline void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache)

{

}

#endif



#define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */