Introduce one anonymous inode for managing page cache of corresponding
blob file. Then erofs could read directly from the address space of the
anonymous inode when cache hit.
Signed-off-by: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
---
fs/erofs/fscache.c | 35 +++++++++++++++++++++++++++++++++++
fs/erofs/internal.h | 1 +
2 files changed, 36 insertions(+)
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index 15c5bb0f8ea5..4dfca7c95710 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -34,6 +34,33 @@ static void erofs_fscache_cleanup_cookie(struct erofs_cookie_ctx *ctx)
ctx->cookie = NULL;
}
+static const struct address_space_operations erofs_fscache_aops = {
+};
+
+static int erofs_fscache_get_inode(struct erofs_cookie_ctx *ctx,
+ struct super_block *sb)
+{
+ struct inode *const inode = new_inode(sb);
+
+ if (!inode)
+ return -ENOMEM;
+
+ set_nlink(inode, 1);
+ inode->i_size = OFFSET_MAX;
+
+ inode->i_mapping->a_ops = &erofs_fscache_aops;
+ mapping_set_gfp_mask(inode->i_mapping,
+ GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE);
+ ctx->inode = inode;
+ return 0;
+}
+
+static void erofs_fscache_put_inode(struct erofs_cookie_ctx *ctx)
+{
+ iput(ctx->inode);
+ ctx->inode = NULL;
+}
+
static int erofs_fscahce_init_ctx(struct erofs_cookie_ctx *ctx,
struct super_block *sb, char *path)
{
@@ -45,12 +72,20 @@ static int erofs_fscahce_init_ctx(struct erofs_cookie_ctx *ctx,
return ret;
}
+ ret = erofs_fscache_get_inode(ctx, sb);
+ if (ret) {
+ erofs_err(sb, "failed to get anonymous inode\n");
+ erofs_fscache_cleanup_cookie(ctx);
+ return ret;
+ }
+
return 0;
}
static void erofs_fscache_cleanup_ctx(struct erofs_cookie_ctx *ctx)
{
erofs_fscache_cleanup_cookie(ctx);
+ erofs_fscache_put_inode(ctx);
}
struct erofs_cookie_ctx *erofs_fscache_get_ctx(struct super_block *sb,
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 4179c3dcb7f9..2e4f267b37e7 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -93,6 +93,7 @@ struct erofs_sb_lz4_info {
struct erofs_cookie_ctx {
struct fscache_cookie *cookie;
+ struct inode *inode;
};
struct erofs_sb_info {
--
2.27.0
--
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