Merge tag 'erofs-for-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs

Pull erofs updates from Gao Xiang:
 "In this cycle, we introduce compressed inode support over fscache
  since a lot of native EROFS images are explicitly compressed so that
  EROFS over fscache can be more widely used even without Dragonfly
  Nydus [1].

  Apart from that, there are some folio conversions for compressed
  inodes available as well as a lockdep false positive fix.

  Summary:

   - Some folio conversions for compressed inodes;

   - Add compressed inode support over fscache;

   - Fix lockdep false positives of erofs_pseudo_mnt"

Link: https://nydus.dev [1]

* tag 'erofs-for-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
  erofs: support compressed inodes over fscache
  erofs: make iov_iter describe target buffers over fscache
  erofs: fix lockdep false positives on initializing erofs_pseudo_mnt
  erofs: refine managed cache operations to folios
  erofs: convert z_erofs_submissionqueue_endio() to folios
  erofs: convert z_erofs_fill_bio_vec() to folios
  erofs: get rid of `justfound` debugging tag
  erofs: convert z_erofs_do_read_page() to folios
  erofs: convert z_erofs_onlinepage_.* to folios

fs/erofs/compress.h

@@ -81,13 +81,6 @@ static inline bool z_erofs_put_shortlivedpage(struct page **pagepool,
 	return true;
 }
 
-#define MNGD_MAPPING(sbi)	((sbi)->managed_cache->i_mapping)
-static inline bool erofs_page_is_managed(const struct erofs_sb_info *sbi,
-					 struct page *page)
-{
-	return page->mapping == MNGD_MAPPING(sbi);
-}
-
 int z_erofs_fixup_insize(struct z_erofs_decompress_req *rq, const char *padbuf,
 			 unsigned int padbufsize);
 extern const struct z_erofs_decompressor erofs_decompressors[];

fs/erofs/decompressor_deflate.c

@@ -212,9 +212,6 @@ int z_erofs_deflate_decompress(struct z_erofs_decompress_req *rq,
 
 			if (rq->out[no] != rq->in[j])
 				continue;
-
-			DBG_BUGON(erofs_page_is_managed(EROFS_SB(sb),
-							rq->in[j]));
 			tmppage = erofs_allocpage(pgpl, rq->gfp);
 			if (!tmppage) {
 				err = -ENOMEM;

fs/erofs/decompressor_lzma.c

@@ -258,9 +258,6 @@ int z_erofs_lzma_decompress(struct z_erofs_decompress_req *rq,
 
 			if (rq->out[no] != rq->in[j])
 				continue;
-
-			DBG_BUGON(erofs_page_is_managed(EROFS_SB(rq->sb),
-							rq->in[j]));
 			tmppage = erofs_allocpage(pgpl, rq->gfp);
 			if (!tmppage) {
 				err = -ENOMEM;

fs/erofs/inode.c

@@ -259,14 +259,12 @@ static int erofs_fill_inode(struct inode *inode)
 
 	if (erofs_inode_is_data_compressed(vi->datalayout)) {
 #ifdef CONFIG_EROFS_FS_ZIP
-		if (!erofs_is_fscache_mode(inode->i_sb)) {
-			DO_ONCE_LITE_IF(inode->i_sb->s_blocksize != PAGE_SIZE,
-				  erofs_info, inode->i_sb,
-				  "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
-			inode->i_mapping->a_ops = &z_erofs_aops;
-			err = 0;
-			goto out_unlock;
-		}
+		DO_ONCE_LITE_IF(inode->i_blkbits != PAGE_SHIFT,
+			  erofs_info, inode->i_sb,
+			  "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
+		inode->i_mapping->a_ops = &z_erofs_aops;
+		err = 0;
+		goto out_unlock;
 #endif
 		err = -EOPNOTSUPP;
 		goto out_unlock;

fs/erofs/internal.h

@@ -385,7 +385,6 @@ struct erofs_map_dev {
 	unsigned int m_deviceid;
 };
 
-extern struct file_system_type erofs_fs_type;
 extern const struct super_operations erofs_sops;
 
 extern const struct address_space_operations erofs_raw_access_aops;
@@ -467,8 +466,8 @@ int __init erofs_init_shrinker(void);
 void erofs_exit_shrinker(void);
 int __init z_erofs_init_zip_subsystem(void);
 void z_erofs_exit_zip_subsystem(void);
-int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
-				       struct erofs_workgroup *egrp);
+int erofs_try_to_free_all_cached_folios(struct erofs_sb_info *sbi,
+					struct erofs_workgroup *egrp);
 int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
 			    int flags);
 void *erofs_get_pcpubuf(unsigned int requiredpages);
@@ -513,6 +512,8 @@ void erofs_fscache_unregister_fs(struct super_block *sb);
 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
 					char *name, unsigned int flags);
 void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache);
+struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev);
+void erofs_fscache_submit_bio(struct bio *bio);
 #else
 static inline int erofs_fscache_register_fs(struct super_block *sb)
 {
@@ -530,6 +531,8 @@ struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
 static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache)
 {
 }
+static inline struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev) { return NULL; }
+static inline void erofs_fscache_submit_bio(struct bio *bio) {}
 #endif
 
 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */

fs/erofs/super.c

@@ -579,13 +579,6 @@ static const struct export_operations erofs_export_ops = {
 	.get_parent = erofs_get_parent,
 };
 
-static int erofs_fc_fill_pseudo_super(struct super_block *sb, struct fs_context *fc)
-{
-	static const struct tree_descr empty_descr = {""};
-
-	return simple_fill_super(sb, EROFS_SUPER_MAGIC, &empty_descr);
-}
-
 static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
 {
 	struct inode *inode;
@@ -712,11 +705,6 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
 	return 0;
 }
 
-static int erofs_fc_anon_get_tree(struct fs_context *fc)
-{
-	return get_tree_nodev(fc, erofs_fc_fill_pseudo_super);
-}
-
 static int erofs_fc_get_tree(struct fs_context *fc)
 {
 	struct erofs_fs_context *ctx = fc->fs_private;
@@ -789,20 +777,10 @@ static const struct fs_context_operations erofs_context_ops = {
 	.free		= erofs_fc_free,
 };
 
-static const struct fs_context_operations erofs_anon_context_ops = {
-	.get_tree       = erofs_fc_anon_get_tree,
-};
-
 static int erofs_init_fs_context(struct fs_context *fc)
 {
 	struct erofs_fs_context *ctx;
 
-	/* pseudo mount for anon inodes */
-	if (fc->sb_flags & SB_KERNMOUNT) {
-		fc->ops = &erofs_anon_context_ops;
-		return 0;
-	}
-
 	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;
@@ -824,12 +802,6 @@ static void erofs_kill_sb(struct super_block *sb)
 {
 	struct erofs_sb_info *sbi;
 
-	/* pseudo mount for anon inodes */
-	if (sb->s_flags & SB_KERNMOUNT) {
-		kill_anon_super(sb);
-		return;
-	}
-
 	if (erofs_is_fscache_mode(sb))
 		kill_anon_super(sb);
 	else
@@ -868,7 +840,7 @@ static void erofs_put_super(struct super_block *sb)
 	erofs_fscache_unregister_fs(sb);
 }
 
-struct file_system_type erofs_fs_type = {
+static struct file_system_type erofs_fs_type = {
 	.owner          = THIS_MODULE,
 	.name           = "erofs",
 	.init_fs_context = erofs_init_fs_context,

fs/erofs/utils.c

@@ -129,7 +129,7 @@ static bool erofs_try_to_release_workgroup(struct erofs_sb_info *sbi,
 	 * the XArray. Otherwise some cached pages could be still attached to
 	 * the orphan old workgroup when the new one is available in the tree.
 	 */
-	if (erofs_try_to_free_all_cached_pages(sbi, grp))
+	if (erofs_try_to_free_all_cached_folios(sbi, grp))
 		goto out;
 
 	/*