Introduce one anonymous inode for data blobs so that erofs can cache
metadata directly within such anonymous inode.
Signed-off-by: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
Reviewed-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
---
fs/erofs/fscache.c | 39 ++++++++++++++++++++++++++++++++++++---
fs/erofs/internal.h | 6 ++++--
2 files changed, 40 insertions(+), 5 deletions(-)
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index dfff245b006b..26f038d9c4e1 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -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;
}
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index b1f19f058503..5867cb63fd74 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -99,6 +99,7 @@ struct erofs_sb_lz4_info {
struct erofs_fscache {
struct fscache_cookie *cookie;
+ struct inode *inode;
};
struct erofs_sb_info {
@@ -632,7 +633,8 @@ 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)
@@ -643,7 +645,7 @@ 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;
}
--
2.27.0
--
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