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erofs: add fscache context helper functions

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

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220425122143.56815-13-jefflexu@linux.alibaba.com
Acked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Jeffle Xu 2022-04-25 20:21:34 +08:00 committed by Gao Xiang
parent c6be2bd0a5
commit b02c602f06
2 changed files with 60 additions and 0 deletions
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41
fs/erofs/fscache.c
View File

@ -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);

19
fs/erofs/internal.h
View File

@ -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 */