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erofs: add anonymous inode caching metadata for data blobs 

Introduce one anonymous inode for data blobs so that erofs can cache
metadata directly within such anonymous inode.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220425122143.56815-14-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 20:21:35 +08:00 committed by Gao Xiang
parent b02c602f06
commit 3c265d7dce
2 changed files with 40 additions and 5 deletions
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39
fs/erofs/fscache.c
View File

@ -5,12 +5,17 @@
#include <linux/fscache.h>
#include "internal.h"
static const struct address_space_operations erofs_fscache_meta_aops = {
};
int erofs_fscache_register_cookie(struct super_block *sb,
struct erofs_fscache **fscache, char *name)
struct erofs_fscache **fscache,
char *name, bool need_inode)
{
struct fscache_volume *volume = EROFS_SB(sb)->volume;
struct erofs_fscache *ctx;
struct fscache_cookie *cookie;
int ret;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
@ -20,15 +25,40 @@ int erofs_fscache_register_cookie(struct super_block *sb,
name, strlen(name), NULL, 0, 0);
if (!cookie) {
erofs_err(sb, "failed to get cookie for %s", name);
kfree(name);
return -EINVAL;
ret = -EINVAL;
goto err;
}
fscache_use_cookie(cookie, false);
ctx->cookie = cookie;
if (need_inode) {
struct inode *const inode = new_inode(sb);
if (!inode) {
erofs_err(sb, "failed to get anon inode for %s", name);
ret = -ENOMEM;
goto err_cookie;
}
set_nlink(inode, 1);
inode->i_size = OFFSET_MAX;
inode->i_mapping->a_ops = &erofs_fscache_meta_aops;
mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
ctx->inode = inode;
}
*fscache = ctx;
return 0;
err_cookie:
fscache_unuse_cookie(ctx->cookie, NULL, NULL);
fscache_relinquish_cookie(ctx->cookie, false);
ctx->cookie = NULL;
err:
kfree(ctx);
return ret;
}
void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache)
@ -42,6 +72,9 @@ void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache)
fscache_relinquish_cookie(ctx->cookie, false);
ctx->cookie = NULL;
iput(ctx->inode);
ctx->inode = NULL;
kfree(ctx);
*fscache = NULL;
}

6
fs/erofs/internal.h
View File

@ -99,6 +99,7 @@ struct erofs_sb_lz4_info {
struct erofs_fscache {
struct fscache_cookie *cookie;
struct inode *inode;
};
struct erofs_sb_info {
@ -607,7 +608,8 @@ 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);
struct erofs_fscache **fscache,
char *name, bool need_inode);
void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache);
#else
static inline int erofs_fscache_register_fs(struct super_block *sb)
@ -618,7 +620,7 @@ 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)
char *name, bool need_inode)
{
return -EOPNOTSUPP;
}