Merge tag 'erofs-for-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs

Pull erofs updates from Gao Xiang:
 "The most notable change is the removal of the fscache backend: it has
  been deprecated for almost two years, mainly because EROFS file-backed
  mounts and fanotify pre-content hooks (together with erofs-utils) now
  provide better functionality and simpler codebase. In addition,
  fscache has depended on netfslib for years, which is undesirable for
  EROFS since it is a local filesystem. More details in [1].

  In addition, sparse support has been added to the pcluster layout,
  which is helpful for large sparse AI datasets, and map requests for
  chunk-based inodes have been optimized to be more efficient as well.
  There are also the usual fixes and cleanups.

  Summary:

   - Report more consecutive chunks of the same type for
     each iomap request

   - Add sparse support for the pcluster layout

   - Update the EROFS documentation overview

   - Remove the deprecated fscache backend

   - Various fixes and cleanups"

Link: https://lore.kernel.org/r/20260622013622.934174-1-hsiangkao@linux.alibaba.com [1]

* tag 'erofs-for-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
  erofs: handle 48-bit blocks_hi for compressed inodes
  erofs: remove fscache backend entirely
  erofs: simplify RCU read critical sections
  erofs: add sparse support to pcluster layout
  erofs: add folio order to trace_erofs_read_folio
  erofs: introduce erofs_map_chunks()
  erofs: call erofs_exit_ishare() before rcu_barrier()
  erofs: update the overview of the documentation
  erofs: clean up erofs_ishare_fill_inode()

13 files changed, 231 insertions, 1034 deletions

diff --git a/Documentation/filesystems/erofs.rst b/Documentation/filesystems/erofs.rst
index fe06308e546c..4230884fb359 100644
--- a/Documentation/filesystems/erofs.rst
+++ b/Documentation/filesystems/erofs.rst
@@ -7,83 +7,90 @@ EROFS - Enhanced Read-Only File System
 Overview
 ========
 
-EROFS filesystem stands for Enhanced Read-Only File System.  It aims to form a
-generic read-only filesystem solution for various read-only use cases instead
-of just focusing on storage space saving without considering any side effects
-of runtime performance.
-
-It is designed to meet the needs of flexibility, feature extendability and user
-payload friendly, etc.  Apart from those, it is still kept as a simple
-random-access friendly high-performance filesystem to get rid of unneeded I/O
-amplification and memory-resident overhead compared to similar approaches.
-
-It is implemented to be a better choice for the following scenarios:
-
- - read-only storage media or
-
- - part of a fully trusted read-only solution, which means it needs to be
+EROFS (Enhanced Read-Only File System) is a modern, efficient, and secure
+read-only kernel filesystem designed for various use cases including immutable
+system images, container images, application sandbox images, and dataset
+distribution.
+
+An immutable image filesystem can be regarded as an enhanced archive format
+which allows golden images to be built once and mounted everywhere -- images are
+bit-for-bit identical across all deployments and can be verified, audited, or
+shared without concerns about runtime modifications (in this model, all user
+writes should be redirected into another trusted filesystem, for example, via
+overlayfs for copy-on-write-style redirection, by design).
+
+EROFS is a dedicated implementation of the image filesystem idea above, with a
+flexible, hierarchical on-disk design so that needed features can be enabled on
+demand. Filesystem data in the core format is strictly block-aligned in order
+to perform optimally on all kinds of storage media, including block devices and
+memory-backed devices. The on-disk format is easy to parse and purposely avoids
+the unnecessary metadata redundancy found in generic writable filesystems, which
+can suffer from extra inconsistency issues -- making it ideal for security
+auditing and untrusted remote access. In addition, designs such as inline data,
+inline/shared extended attributes, and optimized (de)compression provide better
+space efficiency while maintaining high performance.
+
+In short, EROFS aims to be a better fit for the following scenarios:
+
+ - As part of a secure immutable storage solution, where it needs to be
    immutable and bit-for-bit identical to the official golden image for
-   their releases due to security or other considerations and
-
- - hope to minimize extra storage space with guaranteed end-to-end performance
-   by using compact layout, transparent file compression and direct access,
-   especially for those embedded devices with limited memory and high-density
-   hosts with numerous containers.
+   each individual copy, in order to meet security, data sharing, and/or
+   other requirements;
 
-Here are the main features of EROFS:
+ - Minimizing storage overhead with guaranteed end-to-end performance
+   by using compact (meta)data layout, optimized transparent data compression,
+   deduplication and direct access, especially for those embedded devices with
+   limited memory and high-density hosts with numerous containers.
 
- - Little endian on-disk design;
+Here is the list of highlights:
 
- - Block-based distribution and file-based distribution over fscache are
-   supported;
+ - Little endian on-disk design with 48-bit block addressing, supporting up
+   to 1 EiB filesystem capacity with 4 KiB block size;
 
- - Support multiple devices to refer to external blobs, which can be used
-   for container images;
+ - Two compact inode metadata layouts for space and performance efficiency:
 
- - 32-bit block addresses for each device, therefore 16TiB address space at
-   most with 4KiB block size for now;
+   ========================  ========  ======================================
+                             compact   extended
+   ========================  ========  ======================================
+   Inode core metadata size  32 bytes  64 bytes
+   Max file size             4 GiB     16 EiB (also limited by max. vol size)
+   Max uids/gids             65536     4294967296
+   Nanosecond timestamps     no        yes
+   Max hardlinks             65536     4294967296
+   ========================  ========  ======================================
 
- - Two inode layouts for different requirements:
+ - Support tailpacking inline data for better space efficiency and reduce
+   unneeded I/O amplification;
 
-   =====================  ============  ======================================
-                          compact (v1)  extended (v2)
-   =====================  ============  ======================================
-   Inode metadata size    32 bytes      64 bytes
-   Max file size          4 GiB         16 EiB (also limited by max. vol size)
-   Max uids/gids          65536         4294967296
-   Per-inode timestamp    no            yes (64 + 32-bit timestamp)
-   Max hardlinks          65536         4294967296
-   Metadata reserved      8 bytes       18 bytes
-   =====================  ============  ======================================
+ - Block-based and file-backed distribution are both supported;
 
- - Support extended attributes as an option;
+ - Multiple devices to reference external data blobs: inode data can be
+   optionally placed into external blobs, which enables image layering and data
+   sharing among different filesystems;
 
- - Support a bloom filter that speeds up negative extended attribute lookups;
+ - Inline and shared extended attributes with an optional bloom filter that
+   speeds up negative extended attribute lookups;
 
- - Support POSIX.1e ACLs by using extended attributes;
+ - POSIX.1e ACLs by using extended attributes;
 
- - Support transparent data compression as an option:
-   LZ4, MicroLZMA, DEFLATE and Zstandard algorithms can be used on a per-file
-   basis; In addition, inplace decompression is also supported to avoid bounce
-   compressed buffers and unnecessary page cache thrashing.
+ - Transparent data compression as an option: Supported algorithms (LZ4,
+   MicroLZMA, DEFLATE and Zstandard) can be selected on a per-inode basis.
+   Both the on-disk metadata and decompression runtime have been heavily
+   optimized to minimize the overhead for better performance.
 
- - Support chunk-based data deduplication and rolling-hash compressed data
-   deduplication;
+ - Merging tail-end data into a special inode as fragments;
 
- - Support tailpacking inline compared to byte-addressed unaligned metadata
-   or smaller block size alternatives;
+ - Chunk-based deduplication and rolling-hash compressed data deduplication;
 
- - Support merging tail-end data into a special inode as fragments.
+ - Direct I/O and FSDAX support on uncompressed inodes for use cases such as
+   secure containers, loop devices, and ramdisks that do not need page caching;
 
- - Support large folios to make use of THPs (Transparent Hugepages);
+ - Page cache sharing among inodes with identical content fingerprints on
+   the same machine.
 
- - Support direct I/O on uncompressed files to avoid double caching for loop
-   devices;
+For more detailed information, please refer to our documentation site:
 
- - Support FSDAX on uncompressed images for secure containers and ramdisks in
-   order to get rid of unnecessary page cache.
-
- - Support file-based on-demand loading with the Fscache infrastructure.
+- https://erofs.docs.kernel.org
 
 The following git tree provides the file system user-space tools under
 development, such as a formatting tool (mkfs.erofs), an on-disk consistency &
@@ -91,10 +98,6 @@ compatibility checking tool (fsck.erofs), and a debugging tool (dump.erofs):
 
 - git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git
 
-For more information, please also refer to the documentation site:
-
-- https://erofs.docs.kernel.org
-
 Bugs and patches are welcome, please kindly help us and send to the following
 linux-erofs mailing list:
 
@@ -127,12 +130,9 @@ dax                    A legacy option which is an alias for ``dax=always``.
 device=%s              Specify a path to an extra device to be used together.
 directio               (For file-backed mounts) Use direct I/O to access backing
                        files, and asynchronous I/O will be enabled if supported.
-fsid=%s                Specify a filesystem image ID for Fscache back-end.
-domain_id=%s           Specify a trusted domain ID for fscache mode so that
-                       different images with the same blobs, identified by blob IDs,
-                       can share storage within the same trusted domain.
-                       Also used for different filesystems with inode page sharing
-                       enabled to share page cache within the trusted domain.
+domain_id=%s           Specify a trusted domain ID. Filesystems sharing the same
+                       domain ID can share page cache across mounts when inode
+                       page sharing is enabled. (not shown in mountinfo output)
 fsoffset=%llu          Specify block-aligned filesystem offset for the primary device.
 inode_share            Enable inode page sharing for this filesystem.  Inodes with
                        identical content within the same domain ID can share the
diff --git a/fs/erofs/Kconfig b/fs/erofs/Kconfig
index 97c48ebe8458..4789b1077d8c 100644
--- a/fs/erofs/Kconfig
+++ b/fs/erofs/Kconfig
@@ -3,13 +3,11 @@
 config EROFS_FS
 	tristate "EROFS filesystem support"
 	depends on BLOCK
-	select CACHEFILES if EROFS_FS_ONDEMAND
 	select CRC32
 	select CRYPTO if EROFS_FS_ZIP_ACCEL
 	select CRYPTO_DEFLATE if EROFS_FS_ZIP_ACCEL
 	select FS_IOMAP
 	select LZ4_DECOMPRESS if EROFS_FS_ZIP
-	select NETFS_SUPPORT if EROFS_FS_ONDEMAND
 	select XXHASH if EROFS_FS_XATTR
 	select XZ_DEC if EROFS_FS_ZIP_LZMA
 	select XZ_DEC_MICROLZMA if EROFS_FS_ZIP_LZMA
@@ -109,9 +107,6 @@ config EROFS_FS_BACKED_BY_FILE
 	  be used to simplify error-prone lifetime management of unnecessary
 	  virtual block devices.
 
-	  Note that this feature, along with ongoing fanotify pre-content
-	  hooks, will eventually replace "EROFS over fscache."
-
 	  If you don't want to enable this feature, say N.
 
 config EROFS_FS_ZIP
@@ -172,20 +167,6 @@ config EROFS_FS_ZIP_ACCEL
 
 	  If unsure, say N.
 
-config EROFS_FS_ONDEMAND
-	bool "EROFS fscache-based on-demand read support (deprecated)"
-	depends on EROFS_FS
-	select FSCACHE
-	select CACHEFILES_ONDEMAND
-	help
-	  This permits EROFS to use fscache-backed data blobs with on-demand
-	  read support.
-
-	  It is now deprecated and scheduled to be removed from the kernel
-	  after fanotify pre-content hooks are landed.
-
-	  If unsure, say N.
-
 config EROFS_FS_PCPU_KTHREAD
 	bool "EROFS per-cpu decompression kthread workers"
 	depends on EROFS_FS_ZIP
@@ -207,7 +188,7 @@ config EROFS_FS_PCPU_KTHREAD_HIPRI
 
 config EROFS_FS_PAGE_CACHE_SHARE
 	bool "EROFS page cache share support (experimental)"
-	depends on EROFS_FS && EROFS_FS_XATTR && !EROFS_FS_ONDEMAND
+	depends on EROFS_FS && EROFS_FS_XATTR
 	help
 	  This enables page cache sharing among inodes with identical
 	  content fingerprints on the same machine.
diff --git a/fs/erofs/Makefile b/fs/erofs/Makefile
index a80e1762b607..30423496786f 100644
--- a/fs/erofs/Makefile
+++ b/fs/erofs/Makefile
@@ -9,5 +9,4 @@ erofs-$(CONFIG_EROFS_FS_ZIP_DEFLATE) += decompressor_deflate.o
 erofs-$(CONFIG_EROFS_FS_ZIP_ZSTD) += decompressor_zstd.o
 erofs-$(CONFIG_EROFS_FS_ZIP_ACCEL) += decompressor_crypto.o
 erofs-$(CONFIG_EROFS_FS_BACKED_BY_FILE) += fileio.o
-erofs-$(CONFIG_EROFS_FS_ONDEMAND) += fscache.o
 erofs-$(CONFIG_EROFS_FS_PAGE_CACHE_SHARE) += ishare.o
diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index 44da21c9d777..9aa48c8d67d1 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -80,9 +80,7 @@ int erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb,
 	if (erofs_is_fileio_mode(sbi)) {
 		buf->file = sbi->dif0.file;	/* some fs like FUSE needs it */
 		buf->mapping = buf->file->f_mapping;
-	} else if (erofs_is_fscache_mode(sb))
-		buf->mapping = sbi->dif0.fscache->inode->i_mapping;
-	else
+	} else
 		buf->mapping = sb->s_bdev->bd_mapping;
 	return 0;
 }
@@ -98,17 +96,73 @@ void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
 	return erofs_bread(buf, offset, true);
 }
 
-int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map)
+static int erofs_map_chunks(struct inode *inode, struct erofs_map_blocks *map)
 {
 	struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
 	struct super_block *sb = inode->i_sb;
-	unsigned int unit, blksz = sb->s_blocksize;
 	struct erofs_inode *vi = EROFS_I(inode);
 	struct erofs_inode_chunk_index *idx;
-	erofs_blk_t startblk, addrmask;
-	bool tailpacking;
+	unsigned int unit = vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES ?
+		sizeof(*idx) : EROFS_BLOCK_MAP_ENTRY_SIZE;
+	erofs_blk_t addrmask = (vi->chunkformat & EROFS_CHUNK_FORMAT_48BIT) ?
+		BIT_ULL(48) - 1 : BIT_ULL(32) - 1;
+	u64 nr = map->m_la >> vi->chunkbits, chunksize = 1ULL << vi->chunkbits;
+	erofs_off_t pos = ALIGN(erofs_iloc(inode) + vi->inode_isize +
+				vi->xattr_isize, unit) + unit * nr;
+	/* m_llen will be clamped to EOF in the end */
+	erofs_off_t endpos = round_up(pos + 1, sb->s_blocksize);
+	u64 last, addr;
+
+	idx = erofs_read_metabuf(&buf, sb, pos, erofs_inode_in_metabox(inode));
+	if (IS_ERR(idx))
+		return PTR_ERR(idx);
+
+	map->m_la = nr << vi->chunkbits;
+	map->m_llen = 0;
+	nr = 0;
+	do {
+		if (unit == EROFS_BLOCK_MAP_ENTRY_SIZE) {
+			addr = le32_to_cpu(((__le32 *)idx)[nr]);
+			if (addr == (u32)EROFS_NULL_ADDR)
+				addr = EROFS_NULL_ADDR;
+		} else {
+			addr = (((u64)le16_to_cpu(idx[nr].startblk_hi) << 32) |
+				le32_to_cpu(idx[nr].startblk_lo)) & addrmask;
+			if (addr ^ (EROFS_NULL_ADDR & addrmask))
+				addr |= (u64)(le16_to_cpu(idx[nr].device_id) &
+					EROFS_SB(sb)->device_id_mask) << 48;
+			else
+				addr = EROFS_NULL_ADDR;
+		}
+		if (!nr) {
+			last = addr;
+			continue;
+		}
+		/* expand and account the prior chunk here */
+		map->m_llen += chunksize;
+		if (last != EROFS_NULL_ADDR)
+			last += erofs_blknr(sb, chunksize);
+	} while (addr == last && pos + (++nr) * unit < endpos);
+
+	if (last != EROFS_NULL_ADDR) {
+		map->m_pa = erofs_pos(sb, last & addrmask) - map->m_llen;
+		map->m_deviceid = last >> 48;
+		map->m_flags = EROFS_MAP_MAPPED;
+	}
+	if (addr == last)
+		map->m_llen += chunksize;
+	map->m_llen = min_t(erofs_off_t, map->m_llen,
+			round_up(inode->i_size - map->m_la, sb->s_blocksize));
+	erofs_put_metabuf(&buf);
+	return 0;
+}
+
+int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map)
+{
+	struct super_block *sb = inode->i_sb;
+	struct erofs_inode *vi = EROFS_I(inode);
+	bool tailinline = (vi->datalayout == EROFS_INODE_FLAT_INLINE);
 	erofs_off_t pos;
-	u64 chunknr;
 	int err = 0;
 
 	trace_erofs_map_blocks_enter(inode, map, 0);
@@ -116,13 +170,10 @@ int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map)
 	map->m_flags = 0;
 	if (map->m_la >= inode->i_size)
 		goto out;
-
-	if (vi->datalayout != EROFS_INODE_CHUNK_BASED) {
-		tailpacking = (vi->datalayout == EROFS_INODE_FLAT_INLINE);
-		if (!tailpacking && vi->startblk == EROFS_NULL_ADDR)
-			goto out;
-		pos = erofs_pos(sb, erofs_iblks(inode) - tailpacking);
-
+	if (vi->datalayout == EROFS_INODE_CHUNK_BASED) {
+		err = erofs_map_chunks(inode, map);
+	} else if (tailinline || vi->startblk != EROFS_NULL_ADDR) {
+		pos = erofs_pos(sb, erofs_iblks(inode) - tailinline);
 		map->m_flags = EROFS_MAP_MAPPED;
 		if (map->m_la < pos) {
 			map->m_pa = erofs_pos(sb, vi->startblk) + map->m_la;
@@ -132,57 +183,15 @@ int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map)
 				vi->xattr_isize + erofs_blkoff(sb, map->m_la);
 			map->m_llen = inode->i_size - map->m_la;
 			map->m_flags |= EROFS_MAP_META;
-		}
-		goto out;
-	}
-
-	if (vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES)
-		unit = sizeof(*idx);			/* chunk index */
-	else
-		unit = EROFS_BLOCK_MAP_ENTRY_SIZE;	/* block map */
-
-	chunknr = map->m_la >> vi->chunkbits;
-	pos = ALIGN(erofs_iloc(inode) + vi->inode_isize +
-		    vi->xattr_isize, unit) + unit * chunknr;
-
-	idx = erofs_read_metabuf(&buf, sb, pos, erofs_inode_in_metabox(inode));
-	if (IS_ERR(idx)) {
-		err = PTR_ERR(idx);
-		goto out;
-	}
-	map->m_la = chunknr << vi->chunkbits;
-	map->m_llen = min_t(erofs_off_t, 1UL << vi->chunkbits,
-			    round_up(inode->i_size - map->m_la, blksz));
-	if (vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES) {
-		addrmask = (vi->chunkformat & EROFS_CHUNK_FORMAT_48BIT) ?
-			BIT_ULL(48) - 1 : BIT_ULL(32) - 1;
-		startblk = (((u64)le16_to_cpu(idx->startblk_hi) << 32) |
-			    le32_to_cpu(idx->startblk_lo)) & addrmask;
-		if ((startblk ^ EROFS_NULL_ADDR) & addrmask) {
-			map->m_deviceid = le16_to_cpu(idx->device_id) &
-				EROFS_SB(sb)->device_id_mask;
-			map->m_pa = erofs_pos(sb, startblk);
-			map->m_flags = EROFS_MAP_MAPPED;
-		}
-	} else {
-		startblk = le32_to_cpu(*(__le32 *)idx);
-		if (startblk != (u32)EROFS_NULL_ADDR) {
-			map->m_pa = erofs_pos(sb, startblk);
-			map->m_flags = EROFS_MAP_MAPPED;
+			if (erofs_blkoff(sb, map->m_pa) + map->m_llen >
+			    sb->s_blocksize) {
+				erofs_err(sb, "inline data across blocks @ nid %llu", vi->nid);
+				return -EFSCORRUPTED;
+			}
 		}
 	}
-	erofs_put_metabuf(&buf);
 out:
-	if (!err) {
-		map->m_plen = map->m_llen;
-		/* inline data should be located in the same meta block */
-		if ((map->m_flags & EROFS_MAP_META) &&
-		    erofs_blkoff(sb, map->m_pa) + map->m_plen > blksz) {
-			erofs_err(sb, "inline data across blocks @ nid %llu", vi->nid);
-			DBG_BUGON(1);
-			return -EFSCORRUPTED;
-		}
-	}
+	map->m_plen = err ? 0 : map->m_llen;
 	trace_erofs_map_blocks_exit(inode, map, 0, err);
 	return err;
 }
diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h
index 7871b16c1d33..16ec4fd33ac6 100644
--- a/fs/erofs/erofs_fs.h
+++ b/fs/erofs/erofs_fs.h
@@ -396,6 +396,8 @@ enum {
 
 /* (noncompact only, HEAD) This pcluster refers to partial decompressed data */
 #define Z_EROFS_LI_PARTIAL_REF		(1 << 15)
+/* (noncompact only, HEAD) This pcluster can also be regarded as a HOLE */
+#define Z_EROFS_LI_HOLE			(1 << 14)
 
 /* Set on 1st non-head lcluster to store compressed block counti (in blocks) */
 #define Z_EROFS_LI_D0_CBLKCNT		(1 << 11)
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
deleted file mode 100644
index 685c68774379..000000000000
--- a/fs/erofs/fscache.c
+++ /dev/null
@@ -1,664 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2022, Alibaba Cloud
- * Copyright (C) 2022, Bytedance Inc. All rights reserved.
- */
-#include <linux/fscache.h>
-#include "internal.h"
-
-static DEFINE_MUTEX(erofs_domain_list_lock);
-static DEFINE_MUTEX(erofs_domain_cookies_lock);
-static LIST_HEAD(erofs_domain_list);
-static LIST_HEAD(erofs_domain_cookies_list);
-static struct vfsmount *erofs_pseudo_mnt;
-
-struct erofs_fscache_io {
-	struct netfs_cache_resources cres;
-	struct iov_iter		iter;
-	netfs_io_terminated_t	end_io;
-	void			*private;
-	refcount_t		ref;
-};
-
-struct erofs_fscache_rq {
-	struct address_space	*mapping;	/* The mapping being accessed */
-	loff_t			start;		/* Start position */
-	size_t			len;		/* Length of the request */
-	size_t			submitted;	/* Length of submitted */
-	short			error;		/* 0 or error that occurred */
-	refcount_t		ref;
-};
-
-static bool erofs_fscache_io_put(struct erofs_fscache_io *io)
-{
-	if (!refcount_dec_and_test(&io->ref))
-		return false;
-	if (io->cres.ops)
-		io->cres.ops->end_operation(&io->cres);
-	kfree(io);
-	return true;
-}
-
-static void erofs_fscache_req_complete(struct erofs_fscache_rq *req)
-{
-	struct folio *folio;
-	bool failed = req->error;
-	pgoff_t start_page = req->start / PAGE_SIZE;
-	pgoff_t last_page = ((req->start + req->len) / PAGE_SIZE) - 1;
-
-	XA_STATE(xas, &req->mapping->i_pages, start_page);
-
-	rcu_read_lock();
-	xas_for_each(&xas, folio, last_page) {
-		if (xas_retry(&xas, folio))
-			continue;
-		if (!failed)
-			folio_mark_uptodate(folio);
-		folio_unlock(folio);
-	}
-	rcu_read_unlock();
-}
-
-static void erofs_fscache_req_put(struct erofs_fscache_rq *req)
-{
-	if (!refcount_dec_and_test(&req->ref))
-		return;
-	erofs_fscache_req_complete(req);
-	kfree(req);
-}
-
-static struct erofs_fscache_rq *erofs_fscache_req_alloc(struct address_space *mapping,
-						loff_t start, size_t len)
-{
-	struct erofs_fscache_rq *req = kzalloc_obj(*req);
-
-	if (!req)
-		return NULL;
-	req->mapping = mapping;
-	req->start = start;
-	req->len = len;
-	refcount_set(&req->ref, 1);
-	return req;
-}
-
-static void erofs_fscache_req_io_put(struct erofs_fscache_io *io)
-{
-	struct erofs_fscache_rq *req = io->private;
-
-	if (erofs_fscache_io_put(io))
-		erofs_fscache_req_put(req);
-}
-
-static void erofs_fscache_req_end_io(void *priv, ssize_t transferred_or_error)
-{
-	struct erofs_fscache_io *io = priv;
-	struct erofs_fscache_rq *req = io->private;
-
-	if (IS_ERR_VALUE(transferred_or_error))
-		req->error = transferred_or_error;
-	erofs_fscache_req_io_put(io);
-}
-
-static struct erofs_fscache_io *erofs_fscache_req_io_alloc(struct erofs_fscache_rq *req)
-{
-	struct erofs_fscache_io *io = kzalloc_obj(*io);
-
-	if (!io)
-		return NULL;
-	io->end_io = erofs_fscache_req_end_io;
-	io->private = req;
-	refcount_inc(&req->ref);
-	refcount_set(&io->ref, 1);
-	return io;
-}
-
-/*
- * Read data from fscache described by cookie at pstart physical address
- * offset, and fill the read data into buffer described by io->iter.
- */
-static int erofs_fscache_read_io_async(struct fscache_cookie *cookie,
-		loff_t pstart, struct erofs_fscache_io *io)
-{
-	enum netfs_io_source source;
-	struct netfs_cache_resources *cres = &io->cres;
-	struct iov_iter *iter = &io->iter;
-	int ret;
-
-	ret = fscache_begin_read_operation(cres, cookie);
-	if (ret)
-		return ret;
-
-	while (iov_iter_count(iter)) {
-		size_t orig_count = iov_iter_count(iter), len = orig_count;
-		unsigned long flags = 1 << NETFS_SREQ_ONDEMAND;
-
-		source = cres->ops->prepare_ondemand_read(cres,
-				pstart, &len, LLONG_MAX, &flags, 0);
-		if (WARN_ON(len == 0))
-			source = NETFS_INVALID_READ;
-		if (source != NETFS_READ_FROM_CACHE) {
-			erofs_err(NULL, "prepare_ondemand_read failed (source %d)", source);
-			return -EIO;
-		}
-
-		iov_iter_truncate(iter, len);
-		refcount_inc(&io->ref);
-		ret = fscache_read(cres, pstart, iter, NETFS_READ_HOLE_FAIL,
-				   io->end_io, io);
-		if (ret == -EIOCBQUEUED)
-			ret = 0;
-		if (ret) {
-			erofs_err(NULL, "fscache_read failed (ret %d)", ret);
-			return ret;
-		}
-		if (WARN_ON(iov_iter_count(iter)))
-			return -EIO;
-
-		iov_iter_reexpand(iter, orig_count - len);
-		pstart += len;
-	}
-	return 0;
-}
-
-struct erofs_fscache_bio {
-	struct erofs_fscache_io io;
-	struct bio bio;		/* w/o bdev to share bio_add_page/endio() */
-	struct bio_vec bvecs[BIO_MAX_VECS];
-};
-
-static void erofs_fscache_bio_endio(void *priv, ssize_t transferred_or_error)
-{
-	struct erofs_fscache_bio *io = priv;
-
-	if (IS_ERR_VALUE(transferred_or_error))
-		io->bio.bi_status = errno_to_blk_status(transferred_or_error);
-	bio_endio(&io->bio);
-	BUILD_BUG_ON(offsetof(struct erofs_fscache_bio, io) != 0);
-	erofs_fscache_io_put(&io->io);
-}
-
-struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev)
-{
-	struct erofs_fscache_bio *io;
-
-	io = kmalloc_obj(*io, GFP_KERNEL | __GFP_NOFAIL);
-	bio_init(&io->bio, NULL, io->bvecs, BIO_MAX_VECS, REQ_OP_READ);
-	io->io.private = mdev->m_dif->fscache->cookie;
-	io->io.end_io = erofs_fscache_bio_endio;
-	refcount_set(&io->io.ref, 1);
-	return &io->bio;
-}
-
-void erofs_fscache_submit_bio(struct bio *bio)
-{
-	struct erofs_fscache_bio *io = container_of(bio,
-			struct erofs_fscache_bio, bio);
-	int ret;
-
-	iov_iter_bvec(&io->io.iter, ITER_DEST, io->bvecs, bio->bi_vcnt,
-		      bio->bi_iter.bi_size);
-	ret = erofs_fscache_read_io_async(io->io.private,
-				bio->bi_iter.bi_sector << 9, &io->io);
-	erofs_fscache_io_put(&io->io);
-	if (!ret)
-		return;
-	bio->bi_status = errno_to_blk_status(ret);
-	bio_endio(bio);
-}
-
-static int erofs_fscache_meta_read_folio(struct file *data, struct folio *folio)
-{
-	struct erofs_fscache *ctx = folio->mapping->host->i_private;
-	int ret = -ENOMEM;
-	struct erofs_fscache_rq *req;
-	struct erofs_fscache_io *io;
-
-	req = erofs_fscache_req_alloc(folio->mapping,
-				folio_pos(folio), folio_size(folio));
-	if (!req) {
-		folio_unlock(folio);
-		return ret;
-	}
-
-	io = erofs_fscache_req_io_alloc(req);
-	if (!io) {
-		req->error = ret;
-		goto out;
-	}
-	iov_iter_xarray(&io->iter, ITER_DEST, &folio->mapping->i_pages,
-			folio_pos(folio), folio_size(folio));
-
-	ret = erofs_fscache_read_io_async(ctx->cookie, folio_pos(folio), io);
-	if (ret)
-		req->error = ret;
-
-	erofs_fscache_req_io_put(io);
-out:
-	erofs_fscache_req_put(req);
-	return ret;
-}
-
-static int erofs_fscache_data_read_slice(struct erofs_fscache_rq *req)
-{
-	struct address_space *mapping = req->mapping;
-	struct inode *inode = mapping->host;
-	struct super_block *sb = inode->i_sb;
-	struct erofs_fscache_io *io;
-	struct erofs_map_blocks map;
-	struct erofs_map_dev mdev;
-	loff_t pos = req->start + req->submitted;
-	size_t count;
-	int ret;
-
-	map.m_la = pos;
-	ret = erofs_map_blocks(inode, &map);
-	if (ret)
-		return ret;
-
-	if (map.m_flags & EROFS_MAP_META) {
-		struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
-		struct iov_iter iter;
-		size_t size = map.m_llen;
-		void *src;
-
-		src = erofs_read_metabuf(&buf, sb, map.m_pa,
-					 erofs_inode_in_metabox(inode));
-		if (IS_ERR(src))
-			return PTR_ERR(src);
-
-		iov_iter_xarray(&iter, ITER_DEST, &mapping->i_pages, pos, PAGE_SIZE);
-		if (copy_to_iter(src, size, &iter) != size) {
-			erofs_put_metabuf(&buf);
-			return -EFAULT;
-		}
-		iov_iter_zero(PAGE_SIZE - size, &iter);
-		erofs_put_metabuf(&buf);
-		req->submitted += PAGE_SIZE;
-		return 0;
-	}
-
-	count = req->len - req->submitted;
-	if (!(map.m_flags & EROFS_MAP_MAPPED)) {
-		struct iov_iter iter;
-
-		iov_iter_xarray(&iter, ITER_DEST, &mapping->i_pages, pos, count);
-		iov_iter_zero(count, &iter);
-		req->submitted += count;
-		return 0;
-	}
-
-	count = min_t(size_t, map.m_llen - (pos - map.m_la), count);
-	DBG_BUGON(!count || count % PAGE_SIZE);
-
-	mdev = (struct erofs_map_dev) {
-		.m_deviceid = map.m_deviceid,
-		.m_pa = map.m_pa,
-	};
-	ret = erofs_map_dev(sb, &mdev);
-	if (ret)
-		return ret;
-
-	io = erofs_fscache_req_io_alloc(req);
-	if (!io)
-		return -ENOMEM;
-	iov_iter_xarray(&io->iter, ITER_DEST, &mapping->i_pages, pos, count);
-	ret = erofs_fscache_read_io_async(mdev.m_dif->fscache->cookie,
-			mdev.m_pa + (pos - map.m_la), io);
-	erofs_fscache_req_io_put(io);
-
-	req->submitted += count;
-	return ret;
-}
-
-static int erofs_fscache_data_read(struct erofs_fscache_rq *req)
-{
-	int ret;
-
-	do {
-		ret = erofs_fscache_data_read_slice(req);
-		if (ret)
-			req->error = ret;
-	} while (!ret && req->submitted < req->len);
-	return ret;
-}
-
-static int erofs_fscache_read_folio(struct file *file, struct folio *folio)
-{
-	struct erofs_fscache_rq *req;
-	int ret;
-
-	req = erofs_fscache_req_alloc(folio->mapping,
-			folio_pos(folio), folio_size(folio));
-	if (!req) {
-		folio_unlock(folio);
-		return -ENOMEM;
-	}
-
-	ret = erofs_fscache_data_read(req);
-	erofs_fscache_req_put(req);
-	return ret;
-}
-
-static void erofs_fscache_readahead(struct readahead_control *rac)
-{
-	struct erofs_fscache_rq *req;
-
-	if (!readahead_count(rac))
-		return;
-
-	req = erofs_fscache_req_alloc(rac->mapping,
-			readahead_pos(rac), readahead_length(rac));
-	if (!req)
-		return;
-
-	/* The request completion will drop refs on the folios. */
-	while (readahead_folio(rac))
-		;
-
-	erofs_fscache_data_read(req);
-	erofs_fscache_req_put(req);
-}
-
-static const struct address_space_operations erofs_fscache_meta_aops = {
-	.read_folio = erofs_fscache_meta_read_folio,
-};
-
-const struct address_space_operations erofs_fscache_access_aops = {
-	.read_folio = erofs_fscache_read_folio,
-	.readahead = erofs_fscache_readahead,
-};
-
-static void erofs_fscache_domain_put(struct erofs_domain *domain)
-{
-	mutex_lock(&erofs_domain_list_lock);
-	if (refcount_dec_and_test(&domain->ref)) {
-		list_del(&domain->list);
-		if (list_empty(&erofs_domain_list)) {
-			kern_unmount(erofs_pseudo_mnt);
-			erofs_pseudo_mnt = NULL;
-		}
-		fscache_relinquish_volume(domain->volume, NULL, false);
-		mutex_unlock(&erofs_domain_list_lock);
-		kfree_sensitive(domain->domain_id);
-		kfree(domain);
-		return;
-	}
-	mutex_unlock(&erofs_domain_list_lock);
-}
-
-static int erofs_fscache_register_volume(struct super_block *sb)
-{
-	struct erofs_sb_info *sbi = EROFS_SB(sb);
-	char *domain_id = sbi->domain_id;
-	struct fscache_volume *volume;
-	char *name;
-	int ret = 0;
-
-	name = kasprintf(GFP_KERNEL, "erofs,%s",
-			 domain_id ? domain_id : sbi->fsid);
-	if (!name)
-		return -ENOMEM;
-
-	volume = fscache_acquire_volume(name, NULL, NULL, 0);
-	if (IS_ERR_OR_NULL(volume)) {
-		erofs_err(sb, "failed to register volume for %s", name);
-		ret = volume ? PTR_ERR(volume) : -EOPNOTSUPP;
-		volume = NULL;
-	}
-
-	sbi->volume = volume;
-	kfree(name);
-	return ret;
-}
-
-static int erofs_fscache_init_domain(struct super_block *sb)
-{
-	int err;
-	struct erofs_domain *domain;
-	struct erofs_sb_info *sbi = EROFS_SB(sb);
-
-	domain = kzalloc_obj(struct erofs_domain);
-	if (!domain)
-		return -ENOMEM;
-
-	domain->domain_id = kstrdup(sbi->domain_id, GFP_KERNEL);
-	if (!domain->domain_id) {
-		kfree(domain);
-		return -ENOMEM;
-	}
-
-	err = erofs_fscache_register_volume(sb);
-	if (err)
-		goto out;
-
-	if (!erofs_pseudo_mnt) {
-		struct vfsmount *mnt = kern_mount(&erofs_anon_fs_type);
-		if (IS_ERR(mnt)) {
-			err = PTR_ERR(mnt);
-			goto out;
-		}
-		erofs_pseudo_mnt = mnt;
-	}
-
-	domain->volume = sbi->volume;
-	refcount_set(&domain->ref, 1);
-	list_add(&domain->list, &erofs_domain_list);
-	sbi->domain = domain;
-	return 0;
-out:
-	kfree_sensitive(domain->domain_id);
-	kfree(domain);
-	return err;
-}
-
-static int erofs_fscache_register_domain(struct super_block *sb)
-{
-	int err;
-	struct erofs_domain *domain;
-	struct erofs_sb_info *sbi = EROFS_SB(sb);
-
-	mutex_lock(&erofs_domain_list_lock);
-	list_for_each_entry(domain, &erofs_domain_list, list) {
-		if (!strcmp(domain->domain_id, sbi->domain_id)) {
-			sbi->domain = domain;
-			sbi->volume = domain->volume;
-			refcount_inc(&domain->ref);
-			mutex_unlock(&erofs_domain_list_lock);
-			return 0;
-		}
-	}
-	err = erofs_fscache_init_domain(sb);
-	mutex_unlock(&erofs_domain_list_lock);
-	return err;
-}
-
-static struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb,
-						char *name, unsigned int flags)
-{
-	struct fscache_volume *volume = EROFS_SB(sb)->volume;
-	struct erofs_fscache *ctx;
-	struct fscache_cookie *cookie;
-	struct super_block *isb;
-	struct inode *inode;
-	int ret;
-
-	ctx = kzalloc_obj(*ctx);
-	if (!ctx)
-		return ERR_PTR(-ENOMEM);
-	INIT_LIST_HEAD(&ctx->node);
-	refcount_set(&ctx->ref, 1);
-
-	cookie = fscache_acquire_cookie(volume, FSCACHE_ADV_WANT_CACHE_SIZE,
-					name, strlen(name), NULL, 0, 0);
-	if (!cookie) {
-		erofs_err(sb, "failed to get cookie for %s", name);
-		ret = -EINVAL;
-		goto err;
-	}
-	fscache_use_cookie(cookie, false);
-
-	/*
-	 * Allocate anonymous inode in global pseudo mount for shareable blobs,
-	 * so that they are accessible among erofs fs instances.
-	 */
-	isb = flags & EROFS_REG_COOKIE_SHARE ? erofs_pseudo_mnt->mnt_sb : sb;
-	inode = new_inode(isb);
-	if (!inode) {
-		erofs_err(sb, "failed to get anon inode for %s", name);
-		ret = -ENOMEM;
-		goto err_cookie;
-	}
-
-	inode->i_size = OFFSET_MAX;
-	inode->i_mapping->a_ops = &erofs_fscache_meta_aops;
-	mapping_set_gfp_mask(inode->i_mapping, GFP_KERNEL);
-	inode->i_blkbits = EROFS_SB(sb)->blkszbits;
-	inode->i_private = ctx;
-
-	ctx->cookie = cookie;
-	ctx->inode = inode;
-	return ctx;
-
-err_cookie:
-	fscache_unuse_cookie(cookie, NULL, NULL);
-	fscache_relinquish_cookie(cookie, false);
-err:
-	kfree(ctx);
-	return ERR_PTR(ret);
-}
-
-static void erofs_fscache_relinquish_cookie(struct erofs_fscache *ctx)
-{
-	fscache_unuse_cookie(ctx->cookie, NULL, NULL);
-	fscache_relinquish_cookie(ctx->cookie, false);
-	iput(ctx->inode);
-	kfree(ctx->name);
-	kfree(ctx);
-}
-
-static struct erofs_fscache *erofs_domain_init_cookie(struct super_block *sb,
-						char *name, unsigned int flags)
-{
-	struct erofs_fscache *ctx;
-	struct erofs_domain *domain = EROFS_SB(sb)->domain;
-
-	ctx = erofs_fscache_acquire_cookie(sb, name, flags);
-	if (IS_ERR(ctx))
-		return ctx;
-
-	ctx->name = kstrdup(name, GFP_KERNEL);
-	if (!ctx->name) {
-		erofs_fscache_relinquish_cookie(ctx);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	refcount_inc(&domain->ref);
-	ctx->domain = domain;
-	list_add(&ctx->node, &erofs_domain_cookies_list);
-	return ctx;
-}
-
-static struct erofs_fscache *erofs_domain_register_cookie(struct super_block *sb,
-						char *name, unsigned int flags)
-{
-	struct erofs_fscache *ctx;
-	struct erofs_domain *domain = EROFS_SB(sb)->domain;
-
-	flags |= EROFS_REG_COOKIE_SHARE;
-	mutex_lock(&erofs_domain_cookies_lock);
-	list_for_each_entry(ctx, &erofs_domain_cookies_list, node) {
-		if (ctx->domain != domain || strcmp(ctx->name, name))
-			continue;
-		if (!(flags & EROFS_REG_COOKIE_NEED_NOEXIST)) {
-			refcount_inc(&ctx->ref);
-		} else {
-			erofs_err(sb, "%s already exists in domain %s", name,
-				  domain->domain_id);
-			ctx = ERR_PTR(-EEXIST);
-		}
-		mutex_unlock(&erofs_domain_cookies_lock);
-		return ctx;
-	}
-	ctx = erofs_domain_init_cookie(sb, name, flags);
-	mutex_unlock(&erofs_domain_cookies_lock);
-	return ctx;
-}
-
-struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
-						    char *name,
-						    unsigned int flags)
-{
-	if (EROFS_SB(sb)->domain_id)
-		return erofs_domain_register_cookie(sb, name, flags);
-	return erofs_fscache_acquire_cookie(sb, name, flags);
-}
-
-void erofs_fscache_unregister_cookie(struct erofs_fscache *ctx)
-{
-	struct erofs_domain *domain = NULL;
-
-	if (!ctx)
-		return;
-	if (!ctx->domain)
-		return erofs_fscache_relinquish_cookie(ctx);
-
-	mutex_lock(&erofs_domain_cookies_lock);
-	if (refcount_dec_and_test(&ctx->ref)) {
-		domain = ctx->domain;
-		list_del(&ctx->node);
-		erofs_fscache_relinquish_cookie(ctx);
-	}
-	mutex_unlock(&erofs_domain_cookies_lock);
-	if (domain)
-		erofs_fscache_domain_put(domain);
-}
-
-int erofs_fscache_register_fs(struct super_block *sb)
-{
-	int ret;
-	struct erofs_sb_info *sbi = EROFS_SB(sb);
-	struct erofs_fscache *fscache;
-	unsigned int flags = 0;
-
-	if (sbi->domain_id)
-		ret = erofs_fscache_register_domain(sb);
-	else
-		ret = erofs_fscache_register_volume(sb);
-	if (ret)
-		return ret;
-
-	/*
-	 * When shared domain is enabled, using NEED_NOEXIST to guarantee
-	 * the primary data blob (aka fsid) is unique in the shared domain.
-	 *
-	 * For non-shared-domain case, fscache_acquire_volume() invoked by
-	 * erofs_fscache_register_volume() has already guaranteed
-	 * the uniqueness of primary data blob.
-	 *
-	 * Acquired domain/volume will be relinquished in kill_sb() on error.
-	 */
-	if (sbi->domain_id)
-		flags |= EROFS_REG_COOKIE_NEED_NOEXIST;
-	fscache = erofs_fscache_register_cookie(sb, sbi->fsid, flags);
-	if (IS_ERR(fscache))
-		return PTR_ERR(fscache);
-
-	sbi->dif0.fscache = fscache;
-	return 0;
-}
-
-void erofs_fscache_unregister_fs(struct super_block *sb)
-{
-	struct erofs_sb_info *sbi = EROFS_SB(sb);
-
-	erofs_fscache_unregister_cookie(sbi->dif0.fscache);
-
-	if (sbi->domain)
-		erofs_fscache_domain_put(sbi->domain);
-	else
-		fscache_relinquish_volume(sbi->volume, NULL, false);
-
-	sbi->dif0.fscache = NULL;
-	sbi->volume = NULL;
-	sbi->domain = NULL;
-}
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index a188c570087a..45afe5c50de8 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -191,8 +191,9 @@ static int erofs_read_inode(struct inode *inode)
 		err = -EFSCORRUPTED;
 		goto err_out;
 	} else {
-		inode->i_blocks = le32_to_cpu(copied.i_u.blocks_lo) <<
-				(sb->s_blocksize_bits - 9);
+		inode->i_blocks = (le32_to_cpu(copied.i_u.blocks_lo) |
+			((u64)le16_to_cpu(copied.i_nb.blocks_hi) << 32)) <<
+				  (sb->s_blocksize_bits - 9);
 	}
 
 	if (vi->datalayout == EROFS_INODE_CHUNK_BASED) {
@@ -255,7 +256,7 @@ static int erofs_fill_inode(struct inode *inode)
 	}
 
 	mapping_set_large_folios(inode->i_mapping);
-	aops = erofs_get_aops(inode, false);
+	aops = erofs_get_aops(inode);
 	if (IS_ERR(aops))
 		return PTR_ERR(aops);
 	inode->i_mapping->a_ops = aops;
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 4792490161ec..580f8d9f14e7 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -23,6 +23,8 @@
 __printf(2, 3) void _erofs_printk(struct super_block *sb, const char *fmt, ...);
 #define erofs_err(sb, fmt, ...)	\
 	_erofs_printk(sb, KERN_ERR fmt "\n", ##__VA_ARGS__)
+#define erofs_warn(sb, fmt, ...) \
+	_erofs_printk(sb, KERN_WARNING fmt "\n", ##__VA_ARGS__)
 #define erofs_info(sb, fmt, ...) \
 	_erofs_printk(sb, KERN_INFO fmt "\n", ##__VA_ARGS__)
 
@@ -41,7 +43,6 @@ typedef u64 erofs_blk_t;
 
 struct erofs_device_info {
 	char *path;
-	struct erofs_fscache *fscache;
 	struct file *file;
 	struct dax_device *dax_dev;
 	u64 fsoff, dax_part_off;
@@ -78,24 +79,6 @@ struct erofs_sb_lz4_info {
 	u16 max_pclusterblks;
 };
 
-struct erofs_domain {
-	refcount_t ref;
-	struct list_head list;
-	struct fscache_volume *volume;
-	char *domain_id;
-};
-
-struct erofs_fscache {
-	struct fscache_cookie *cookie;
-	struct inode *inode;	/* anonymous inode for the blob */
-
-	/* used for share domain mode */
-	struct erofs_domain *domain;
-	struct list_head node;
-	refcount_t ref;
-	char *name;
-};
-
 struct erofs_xattr_prefix_item {
 	struct erofs_xattr_long_prefix *prefix;
 	u8 infix_len;
@@ -160,10 +143,6 @@ struct erofs_sb_info {
 	struct completion s_kobj_unregister;
 	erofs_off_t dir_ra_bytes;
 
-	/* fscache support */
-	struct fscache_volume *volume;
-	struct erofs_domain *domain;
-	char *fsid;
 	char *domain_id;
 };
 
@@ -189,12 +168,6 @@ static inline bool erofs_is_fileio_mode(struct erofs_sb_info *sbi)
 
 extern struct file_system_type erofs_anon_fs_type;
 
-static inline bool erofs_is_fscache_mode(struct super_block *sb)
-{
-	return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) &&
-			!erofs_is_fileio_mode(EROFS_SB(sb)) && !sb->s_bdev;
-}
-
 enum {
 	EROFS_ZIP_CACHE_DISABLED,
 	EROFS_ZIP_CACHE_READAHEAD,
@@ -411,11 +384,9 @@ struct erofs_map_dev {
 };
 
 extern const struct super_operations erofs_sops;
-
 extern const struct address_space_operations erofs_aops;
 extern const struct address_space_operations erofs_fileio_aops;
 extern const struct address_space_operations z_erofs_aops;
-extern const struct address_space_operations erofs_fscache_access_aops;
 
 extern const struct inode_operations erofs_generic_iops;
 extern const struct inode_operations erofs_symlink_iops;
@@ -428,10 +399,6 @@ extern const struct file_operations erofs_ishare_fops;
 
 extern const struct iomap_ops z_erofs_iomap_report_ops;
 
-/* flags for erofs_fscache_register_cookie() */
-#define EROFS_REG_COOKIE_SHARE		0x0001
-#define EROFS_REG_COOKIE_NEED_NOEXIST	0x0002
-
 void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
 			  erofs_off_t *offset, int *lengthp);
 void erofs_unmap_metabuf(struct erofs_buf *buf);
@@ -471,7 +438,7 @@ static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count)
 }
 
 static inline const struct address_space_operations *
-erofs_get_aops(struct inode *realinode, bool no_fscache)
+erofs_get_aops(struct inode *realinode)
 {
 	if (erofs_inode_is_data_compressed(EROFS_I(realinode)->datalayout)) {
 		if (!IS_ENABLED(CONFIG_EROFS_FS_ZIP))
@@ -481,9 +448,6 @@ erofs_get_aops(struct inode *realinode, bool no_fscache)
 			  "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
 		return &z_erofs_aops;
 	}
-	if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !no_fscache &&
-	    erofs_is_fscache_mode(realinode->i_sb))
-		return &erofs_fscache_access_aops;
 	if (IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) &&
 	    erofs_is_fileio_mode(EROFS_SB(realinode->i_sb)))
 		return &erofs_fileio_aops;
@@ -546,36 +510,6 @@ static inline struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev) { r
 static inline void erofs_fileio_submit_bio(struct bio *bio) {}
 #endif
 
-#ifdef CONFIG_EROFS_FS_ONDEMAND
-int erofs_fscache_register_fs(struct super_block *sb);
-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)
-{
-	return -EOPNOTSUPP;
-}
-static inline void erofs_fscache_unregister_fs(struct super_block *sb) {}
-
-static inline
-struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
-					char *name, unsigned int flags)
-{
-	return ERR_PTR(-EOPNOTSUPP);
-}
-
-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
-
 #ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE
 int __init erofs_init_ishare(void);
 void erofs_exit_ishare(void);
diff --git a/fs/erofs/ishare.c b/fs/erofs/ishare.c
index 6ed66b17359b..0868c12fc15b 100644
--- a/fs/erofs/ishare.c
+++ b/fs/erofs/ishare.c
@@ -40,49 +40,42 @@ static int erofs_ishare_iget5_set(struct inode *inode, void *data)
 bool erofs_ishare_fill_inode(struct inode *inode)
 {
 	struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
-	struct erofs_inode *vi = EROFS_I(inode);
 	const struct address_space_operations *aops;
+	struct erofs_inode *vi = EROFS_I(inode);
 	struct erofs_inode_fingerprint fp;
-	struct inode *sharedinode;
-	unsigned long hash;
+	struct inode *si;
 
-	aops = erofs_get_aops(inode, true);
+	aops = erofs_get_aops(inode);
 	if (IS_ERR(aops))
 		return false;
 	if (erofs_xattr_fill_inode_fingerprint(&fp, inode, sbi->domain_id))
 		return false;
-	hash = xxh32(fp.opaque, fp.size, 0);
-	sharedinode = iget5_locked(erofs_ishare_mnt->mnt_sb, hash,
-				   erofs_ishare_iget5_eq, erofs_ishare_iget5_set,
-				   &fp);
-	if (!sharedinode) {
-		kfree(fp.opaque);
-		return false;
-	}
 
-	if (inode_state_read_once(sharedinode) & I_NEW) {
-		sharedinode->i_mapping->a_ops = aops;
-		sharedinode->i_size = vi->vfs_inode.i_size;
-		unlock_new_inode(sharedinode);
+	si = iget5_locked(erofs_ishare_mnt->mnt_sb,
+			  xxh32(fp.opaque, fp.size, 0),
+			  erofs_ishare_iget5_eq, erofs_ishare_iget5_set, &fp);
+	if (si && (inode_state_read_once(si) & I_NEW)) {
+		si->i_mapping->a_ops = aops;
+		si->i_size = inode->i_size;
+		unlock_new_inode(si);
 	} else {
 		kfree(fp.opaque);
-		if (aops != sharedinode->i_mapping->a_ops) {
-			iput(sharedinode);
+		if (!si || aops != si->i_mapping->a_ops) {
+			iput(si);
 			return false;
 		}
-		if (sharedinode->i_size != vi->vfs_inode.i_size) {
-			_erofs_printk(inode->i_sb, KERN_WARNING
-				"size(%lld:%lld) not matches for the same fingerprint\n",
-				vi->vfs_inode.i_size, sharedinode->i_size);
-			iput(sharedinode);
+		if (si->i_size != inode->i_size) {
+			erofs_warn(inode->i_sb, "i_size mismatch (%lld != %lld) for the same fingerprint",
+				   inode->i_size, si->i_size);
+			iput(si);
 			return false;
 		}
 	}
-	vi->sharedinode = sharedinode;
+	vi->sharedinode = si;
 	INIT_LIST_HEAD(&vi->ishare_list);
-	spin_lock(&EROFS_I(sharedinode)->ishare_lock);
-	list_add(&vi->ishare_list, &EROFS_I(sharedinode)->ishare_list);
-	spin_unlock(&EROFS_I(sharedinode)->ishare_lock);
+	spin_lock(&EROFS_I(si)->ishare_lock);
+	list_add(&vi->ishare_list, &EROFS_I(si)->ishare_list);
+	spin_unlock(&EROFS_I(si)->ishare_lock);
 	return true;
 }
 
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 802add6652fd..86fa5c6a0c70 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -126,7 +126,6 @@ static int erofs_init_device(struct erofs_buf *buf, struct super_block *sb,
 			     struct erofs_device_info *dif, erofs_off_t *pos)
 {
 	struct erofs_sb_info *sbi = EROFS_SB(sb);
-	struct erofs_fscache *fscache;
 	struct erofs_deviceslot *dis;
 	struct file *file;
 	bool _48bit;
@@ -145,12 +144,7 @@ static int erofs_init_device(struct erofs_buf *buf, struct super_block *sb,
 			return -ENOMEM;
 	}
 
-	if (erofs_is_fscache_mode(sb)) {
-		fscache = erofs_fscache_register_cookie(sb, dif->path, 0);
-		if (IS_ERR(fscache))
-			return PTR_ERR(fscache);
-		dif->fscache = fscache;
-	} else if (!sbi->devs->flatdev) {
+	if (!sbi->devs->flatdev) {
 		file = erofs_is_fileio_mode(sbi) ?
 				filp_open(dif->path, O_RDONLY | O_LARGEFILE, 0) :
 				bdev_file_open_by_path(dif->path,
@@ -216,7 +210,7 @@ static int erofs_scan_devices(struct super_block *sb,
 	if (!ondisk_extradevs)
 		return 0;
 
-	if (!sbi->devs->extra_devices && !erofs_is_fscache_mode(sb))
+	if (!sbi->devs->extra_devices)
 		sbi->devs->flatdev = true;
 
 	sbi->device_id_mask = roundup_pow_of_two(ondisk_extradevs + 1) - 1;
@@ -372,8 +366,6 @@ static int erofs_read_superblock(struct super_block *sb)
 		erofs_info(sb, "EXPERIMENTAL 48-bit layout support in use. Use at your own risk!");
 	if (erofs_sb_has_metabox(sbi))
 		erofs_info(sb, "EXPERIMENTAL metadata compression support in use. Use at your own risk!");
-	if (erofs_is_fscache_mode(sb))
-		erofs_info(sb, "[deprecated] fscache-based on-demand read feature in use. Use at your own risk!");
 out:
 	erofs_put_metabuf(&buf);
 	return ret;
@@ -393,8 +385,7 @@ static void erofs_default_options(struct erofs_sb_info *sbi)
 
 enum {
 	Opt_user_xattr, Opt_acl, Opt_cache_strategy, Opt_dax, Opt_dax_enum,
-	Opt_device, Opt_fsid, Opt_domain_id, Opt_directio, Opt_fsoffset,
-	Opt_inode_share,
+	Opt_device, Opt_domain_id, Opt_directio, Opt_fsoffset, Opt_inode_share,
 };
 
 static const struct constant_table erofs_param_cache_strategy[] = {
@@ -418,7 +409,6 @@ static const struct fs_parameter_spec erofs_fs_parameters[] = {
 	fsparam_flag("dax",             Opt_dax),
 	fsparam_enum("dax",		Opt_dax_enum, erofs_dax_param_enums),
 	fsparam_string("device",	Opt_device),
-	fsparam_string("fsid",		Opt_fsid),
 	fsparam_string("domain_id",	Opt_domain_id),
 	fsparam_flag_no("directio",	Opt_directio),
 	fsparam_u64("fsoffset",		Opt_fsoffset),
@@ -509,25 +499,14 @@ static int erofs_fc_parse_param(struct fs_context *fc,
 		}
 		++sbi->devs->extra_devices;
 		break;
-#ifdef CONFIG_EROFS_FS_ONDEMAND
-	case Opt_fsid:
-		kfree(sbi->fsid);
-		sbi->fsid = kstrdup(param->string, GFP_KERNEL);
-		if (!sbi->fsid)
-			return -ENOMEM;
-		break;
-#endif
-#if defined(CONFIG_EROFS_FS_ONDEMAND) || defined(CONFIG_EROFS_FS_PAGE_CACHE_SHARE)
 	case Opt_domain_id:
-		kfree_sensitive(sbi->domain_id);
-		sbi->domain_id = no_free_ptr(param->string);
-		break;
-#else
-	case Opt_fsid:
-	case Opt_domain_id:
-		errorfc(fc, "%s option not supported", erofs_fs_parameters[opt].name);
+		if (!IS_ENABLED(CONFIG_EROFS_FS_PAGE_CACHE_SHARE)) {
+			errorfc(fc, "%s option not supported", erofs_fs_parameters[opt].name);
+		} else {
+			kfree_sensitive(sbi->domain_id);
+			sbi->domain_id = no_free_ptr(param->string);
+		}
 		break;
-#endif
 	case Opt_directio:
 		if (!IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE))
 			errorfc(fc, "%s option not supported", erofs_fs_parameters[opt].name);
@@ -620,12 +599,7 @@ static void erofs_set_sysfs_name(struct super_block *sb)
 {
 	struct erofs_sb_info *sbi = EROFS_SB(sb);
 
-	if (sbi->domain_id && sbi->fsid)
-		super_set_sysfs_name_generic(sb, "%s,%s", sbi->domain_id,
-					     sbi->fsid);
-	else if (sbi->fsid)
-		super_set_sysfs_name_generic(sb, "%s", sbi->fsid);
-	else if (erofs_is_fileio_mode(sbi))
+	if (erofs_is_fileio_mode(sbi))
 		super_set_sysfs_name_generic(sb, "%s",
 					     bdi_dev_name(sb->s_bdi));
 	else
@@ -680,11 +654,6 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
 		sb->s_blocksize = PAGE_SIZE;
 		sb->s_blocksize_bits = PAGE_SHIFT;
 
-		if (erofs_is_fscache_mode(sb)) {
-			err = erofs_fscache_register_fs(sb);
-			if (err)
-				return err;
-		}
 		err = super_setup_bdi(sb);
 		if (err)
 			return err;
@@ -703,11 +672,6 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
 		return err;
 
 	if (sb->s_blocksize_bits != sbi->blkszbits) {
-		if (erofs_is_fscache_mode(sb)) {
-			errorfc(fc, "unsupported blksize for fscache mode");
-			return -EINVAL;
-		}
-
 		if (erofs_is_fileio_mode(sbi)) {
 			sb->s_blocksize = 1 << sbi->blkszbits;
 			sb->s_blocksize_bits = sbi->blkszbits;
@@ -716,14 +680,9 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
 			return -EINVAL;
 		}
 	}
-
-	if (sbi->dif0.fsoff) {
-		if (sbi->dif0.fsoff & (sb->s_blocksize - 1))
-			return invalfc(fc, "fsoffset %llu is not aligned to block size %lu",
-				       sbi->dif0.fsoff, sb->s_blocksize);
-		if (erofs_is_fscache_mode(sb))
-			return invalfc(fc, "cannot use fsoffset in fscache mode");
-	}
+	if (sbi->dif0.fsoff & (sb->s_blocksize - 1))
+		return invalfc(fc, "fsoffset %llu is not aligned to block size %lu",
+			       sbi->dif0.fsoff, sb->s_blocksize);
 
 	if (test_opt(&sbi->opt, DAX_ALWAYS) && sbi->blkszbits != PAGE_SHIFT) {
 		erofs_info(sb, "unsupported blocksize for DAX");
@@ -793,16 +752,13 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
 
 static int erofs_fc_get_tree(struct fs_context *fc)
 {
-	struct erofs_sb_info *sbi = fc->s_fs_info;
 	int ret;
 
-	if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && sbi->fsid)
-		return get_tree_nodev(fc, erofs_fc_fill_super);
-
 	ret = get_tree_bdev_flags(fc, erofs_fc_fill_super,
 		IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) ?
 			GET_TREE_BDEV_QUIET_LOOKUP : 0);
 	if (IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) && ret == -ENOTBLK) {
+		struct erofs_sb_info *sbi = fc->s_fs_info;
 		struct file *file;
 
 		if (!fc->source)
@@ -827,8 +783,8 @@ static int erofs_fc_reconfigure(struct fs_context *fc)
 
 	DBG_BUGON(!sb_rdonly(sb));
 
-	if (new_sbi->fsid || new_sbi->domain_id)
-		erofs_info(sb, "ignoring reconfiguration for fsid|domain_id.");
+	if (new_sbi->domain_id)
+		erofs_info(sb, "ignoring reconfiguration for domain_id.");
 
 	if (test_opt(&new_sbi->opt, POSIX_ACL))
 		fc->sb_flags |= SB_POSIXACL;
@@ -848,8 +804,6 @@ static int erofs_release_device_info(int id, void *ptr, void *data)
 	fs_put_dax(dif->dax_dev, NULL);
 	if (dif->file)
 		fput(dif->file);
-	erofs_fscache_unregister_cookie(dif->fscache);
-	dif->fscache = NULL;
 	kfree(dif->path);
 	kfree(dif);
 	return 0;
@@ -867,7 +821,6 @@ static void erofs_free_dev_context(struct erofs_dev_context *devs)
 static void erofs_sb_free(struct erofs_sb_info *sbi)
 {
 	erofs_free_dev_context(sbi->devs);
-	kfree(sbi->fsid);
 	kfree_sensitive(sbi->domain_id);
 	if (sbi->dif0.file)
 		fput(sbi->dif0.file);
@@ -928,14 +881,12 @@ static void erofs_kill_sb(struct super_block *sb)
 {
 	struct erofs_sb_info *sbi = EROFS_SB(sb);
 
-	if ((IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && sbi->fsid) ||
-	    sbi->dif0.file)
+	if (sbi->dif0.file)
 		kill_anon_super(sb);
 	else
 		kill_block_super(sb);
 	erofs_drop_internal_inodes(sbi);
 	fs_put_dax(sbi->dif0.dax_dev, NULL);
-	erofs_fscache_unregister_fs(sb);
 	erofs_sb_free(sbi);
 	sb->s_fs_info = NULL;
 }
@@ -950,7 +901,6 @@ static void erofs_put_super(struct super_block *sb)
 	erofs_drop_internal_inodes(sbi);
 	erofs_free_dev_context(sbi->devs);
 	sbi->devs = NULL;
-	erofs_fscache_unregister_fs(sb);
 }
 
 static struct file_system_type erofs_fs_type = {
@@ -962,14 +912,12 @@ static struct file_system_type erofs_fs_type = {
 };
 MODULE_ALIAS_FS("erofs");
 
-#if defined(CONFIG_EROFS_FS_ONDEMAND) || defined(CONFIG_EROFS_FS_PAGE_CACHE_SHARE)
+#ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE
 static void erofs_free_anon_inode(struct inode *inode)
 {
 	struct erofs_inode *vi = EROFS_I(inode);
 
-#ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE
 	kfree(vi->fingerprint.opaque);
-#endif
 	kmem_cache_free(erofs_inode_cachep, vi);
 }
 
@@ -1048,11 +996,11 @@ shrinker_err:
 static void __exit erofs_module_exit(void)
 {
 	unregister_filesystem(&erofs_fs_type);
+	erofs_exit_ishare();
 
-	/* Ensure all RCU free inodes / pclusters are safe to be destroyed. */
+	/* ensure all delayed rcu free inodes & pclusters are flushed */
 	rcu_barrier();
 
-	erofs_exit_ishare();
 	erofs_exit_sysfs();
 	z_erofs_exit_subsystem();
 	erofs_exit_shrinker();
@@ -1099,12 +1047,6 @@ static int erofs_show_options(struct seq_file *seq, struct dentry *root)
 		seq_puts(seq, ",dax=never");
 	if (erofs_is_fileio_mode(sbi) && test_opt(opt, DIRECT_IO))
 		seq_puts(seq, ",directio");
-	if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND)) {
-		if (sbi->fsid)
-			seq_printf(seq, ",fsid=%s", sbi->fsid);
-		if (sbi->domain_id)
-			seq_printf(seq, ",domain_id=%s", sbi->domain_id);
-	}
 	if (sbi->dif0.fsoff)
 		seq_printf(seq, ",fsoffset=%llu", sbi->dif0.fsoff);
 	if (test_opt(opt, INODE_SHARE))
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index c6240dccbb0f..74520e910259 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -806,6 +806,7 @@ static int z_erofs_pcluster_begin(struct z_erofs_frontend *fe)
 	struct super_block *sb = fe->inode->i_sb;
 	struct z_erofs_pcluster *pcl = NULL;
 	void *ptr = NULL;
+	bool needretry;
 	int ret;
 
 	DBG_BUGON(fe->pcl);
@@ -825,19 +826,16 @@ static int z_erofs_pcluster_begin(struct z_erofs_frontend *fe)
 		}
 		ptr = map->buf.page;
 	} else {
-		while (1) {
+		do {
 			rcu_read_lock();
 			pcl = xa_load(&EROFS_SB(sb)->managed_pslots, map->m_pa);
-			if (!pcl || z_erofs_get_pcluster(pcl)) {
-				DBG_BUGON(pcl && map->m_pa != pcl->pos);
-				rcu_read_unlock();
-				break;
-			}
+			needretry = pcl && !z_erofs_get_pcluster(pcl);
 			rcu_read_unlock();
-		}
+		} while (needretry);
 	}
 
 	if (pcl) {
+		DBG_BUGON(map->m_pa != pcl->pos);
 		fe->pcl = pcl;
 		ret = -EEXIST;
 	} else {
@@ -1459,21 +1457,19 @@ static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
 		if (sbi->sync_decompress == EROFS_SYNC_DECOMPRESS_AUTO)
 			sbi->sync_decompress = EROFS_SYNC_DECOMPRESS_FORCE_ON;
 #ifdef CONFIG_EROFS_FS_PCPU_KTHREAD
-		struct kthread_worker *worker;
+		scoped_guard(rcu) {
+			struct kthread_worker *worker;
 
-		rcu_read_lock();
-		worker = rcu_dereference(
+			worker = rcu_dereference(
 				z_erofs_pcpu_workers[raw_smp_processor_id()]);
-		if (!worker) {
-			INIT_WORK(&io->u.work, z_erofs_decompressqueue_work);
-			queue_work(z_erofs_workqueue, &io->u.work);
-		} else {
-			kthread_queue_work(worker, &io->u.kthread_work);
+			if (worker) {
+				kthread_queue_work(worker, &io->u.kthread_work);
+				return;
+			}
 		}
-		rcu_read_unlock();
-#else
-		queue_work(z_erofs_workqueue, &io->u.work);
+		INIT_WORK(&io->u.work, z_erofs_decompressqueue_work);
 #endif
+		queue_work(z_erofs_workqueue, &io->u.work);
 		return;
 	}
 	gfp_flag = memalloc_noio_save();
@@ -1714,8 +1710,6 @@ static void z_erofs_submit_queue(struct z_erofs_frontend *f,
 drain_io:
 				if (erofs_is_fileio_mode(EROFS_SB(sb)))
 					erofs_fileio_submit_bio(bio);
-				else if (erofs_is_fscache_mode(sb))
-					erofs_fscache_submit_bio(bio);
 				else
 					submit_bio(bio);
 
@@ -1744,8 +1738,6 @@ drain_io:
 			if (!bio) {
 				if (erofs_is_fileio_mode(EROFS_SB(sb)))
 					bio = erofs_fileio_bio_alloc(&mdev);
-				else if (erofs_is_fscache_mode(sb))
-					bio = erofs_fscache_bio_alloc(&mdev);
 				else
 					bio = bio_alloc(mdev.m_bdev, BIO_MAX_VECS,
 							REQ_OP_READ, GFP_NOIO);
@@ -1774,8 +1766,6 @@ drain_io:
 	if (bio) {
 		if (erofs_is_fileio_mode(EROFS_SB(sb)))
 			erofs_fileio_submit_bio(bio);
-		else if (erofs_is_fscache_mode(sb))
-			erofs_fscache_submit_bio(bio);
 		else
 			submit_bio(bio);
 	}
diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
index e1a02a2c8406..bab521613552 100644
--- a/fs/erofs/zmap.c
+++ b/fs/erofs/zmap.c
@@ -15,8 +15,9 @@ struct z_erofs_maprecorder {
 	u8  type, headtype;
 	u16 clusterofs;
 	u16 delta[2];
-	erofs_blk_t pblk, compressedblks;
+	erofs_blk_t pblk;
 	erofs_off_t nextpackoff;
+	int compressedblks;
 	bool partialref, in_mbox;
 };
 
@@ -54,7 +55,12 @@ static int z_erofs_load_full_lcluster(struct z_erofs_maprecorder *m, u64 lcn)
 	} else {
 		m->partialref = !!(advise & Z_EROFS_LI_PARTIAL_REF);
 		m->clusterofs = le16_to_cpu(di->di_clusterofs);
-		m->pblk = le32_to_cpu(di->di_u.blkaddr);
+		if (advise & Z_EROFS_LI_HOLE) {
+			m->compressedblks = 0;
+			m->pblk = EROFS_NULL_ADDR;
+		} else {
+			m->pblk = le32_to_cpu(di->di_u.blkaddr);
+		}
 	}
 	return 0;
 }
@@ -309,9 +315,10 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
 	    ((m->headtype == Z_EROFS_LCLUSTER_TYPE_PLAIN ||
 	      m->headtype == Z_EROFS_LCLUSTER_TYPE_HEAD2) && !bigpcl2) ||
 	    (lcn << vi->z_lclusterbits) >= inode->i_size)
-		m->compressedblks = 1;
+		if (m->compressedblks < 0)
+			m->compressedblks = 1;
 
-	if (m->compressedblks)
+	if (m->compressedblks >= 0)
 		goto out;
 
 	err = z_erofs_load_lcluster_from_disk(m, lcn, false);
@@ -329,19 +336,22 @@ static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
 	DBG_BUGON(lcn == initial_lcn &&
 		  m->type == Z_EROFS_LCLUSTER_TYPE_NONHEAD);
 
-	if (m->type == Z_EROFS_LCLUSTER_TYPE_NONHEAD && m->delta[0] != 1) {
+	if (m->type != Z_EROFS_LCLUSTER_TYPE_NONHEAD) {
+		/*
+		 * if the 1st NONHEAD lcluster is actually PLAIN or HEAD type
+		 * rather than CBLKCNT, it's a 1 block-sized pcluster.
+		 */
+		if (m->compressedblks < 0)
+			m->compressedblks = 1;
+	} else if (m->delta[0] != 1 || m->compressedblks < 0) {
 		erofs_err(sb, "bogus CBLKCNT @ lcn %llu of nid %llu", lcn, vi->nid);
 		DBG_BUGON(1);
 		return -EFSCORRUPTED;
 	}
 
-	/*
-	 * if the 1st NONHEAD lcluster is actually PLAIN or HEAD type rather
-	 * than CBLKCNT, it's a 1 block-sized pcluster.
-	 */
-	if (m->type != Z_EROFS_LCLUSTER_TYPE_NONHEAD || !m->compressedblks)
-		m->compressedblks = 1;
 out:
+	if (!m->compressedblks)
+		m->map->m_flags &= ~EROFS_MAP_MAPPED;
 	m->map->m_plen = erofs_pos(sb, m->compressedblks);
 	return 0;
 }
@@ -395,6 +405,7 @@ static int z_erofs_map_blocks_fo(struct inode *inode,
 		.inode = inode,
 		.map = map,
 		.in_mbox = erofs_inode_in_metabox(inode),
+		.compressedblks = -1,
 	};
 	unsigned int endoff;
 	unsigned long initial_lcn;
diff --git a/include/trace/events/erofs.h b/include/trace/events/erofs.h
index cd0e3fd8c23f..0a178cb10fb1 100644
--- a/include/trace/events/erofs.h
+++ b/include/trace/events/erofs.h
@@ -90,7 +90,7 @@ TRACE_EVENT(erofs_read_folio,
 		__field(erofs_nid_t,    nid     )
 		__field(int,		dir	)
 		__field(pgoff_t,	index	)
-		__field(int,		uptodate)
+		__field(unsigned int,	order	)
 		__field(bool,		raw	)
 	),
 
@@ -99,16 +99,15 @@ TRACE_EVENT(erofs_read_folio,
 		__entry->nid	= EROFS_I(inode)->nid;
 		__entry->dir	= S_ISDIR(inode->i_mode);
 		__entry->index	= folio->index;
-		__entry->uptodate = folio_test_uptodate(folio);
+		__entry->order	= folio_order(folio);
 		__entry->raw = raw;
 	),
 
-	TP_printk("dev = (%d,%d), nid = %llu, %s, index = %lu, uptodate = %d "
-		"raw = %d",
+	TP_printk("dev = (%d,%d), nid = %llu, %s, index = %lu, order = %u, raw = %d",
 		show_dev_nid(__entry),
 		show_file_type(__entry->dir),
 		(unsigned long)__entry->index,
-		__entry->uptodate,
+		__entry->order,
 		__entry->raw)
 );