@@ -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,
@@ -93,6 +93,7 @@ struct erofs_sb_lz4_info {
struct erofs_cookie_ctx {
struct fscache_cookie *cookie;
+ struct inode *inode;
};
struct erofs_sb_info {
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@linux.alibaba.com> --- fs/erofs/fscache.c | 35 +++++++++++++++++++++++++++++++++++ fs/erofs/internal.h | 1 + 2 files changed, 36 insertions(+)