Changes since last update:

- Properly handle errors when file-backed I/O fails.
 
  - Fix compilation issues on ARM platform (arm-linux-gnueabi);
 
  - Fix parsing of encoded extents;
 
  - Minor cleanup.
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Merge tag 'erofs-for-6.15-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs

Pull erofs fixes from Gao Xiang:

 - Properly handle errors when file-backed I/O fails

 - Fix compilation issues on ARM platform (arm-linux-gnueabi)

 - Fix parsing of encoded extents

 - Minor cleanup

* tag 'erofs-for-6.15-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
  erofs: remove duplicate code
  erofs: fix encoded extents handling
  erofs: add __packed annotation to union(__le16..)
  erofs: set error to bio if file-backed IO fails

fs/erofs/erofs_fs.h

@@ -56,7 +56,7 @@ struct erofs_super_block {
 	union {
 		__le16 rootnid_2b;	/* nid of root directory */
 		__le16 blocks_hi;	/* (48BIT on) blocks count MSB */
-	} rb;
+	} __packed rb;
 	__le64 inos;            /* total valid ino # (== f_files - f_favail) */
 	__le64 epoch;		/* base seconds used for compact inodes */
 	__le32 fixed_nsec;	/* fixed nanoseconds for compact inodes */
@@ -148,7 +148,7 @@ union erofs_inode_i_nb {
 	__le16 nlink;		/* if EROFS_I_NLINK_1_BIT is unset */
 	__le16 blocks_hi;	/* total blocks count MSB */
 	__le16 startblk_hi;	/* starting block number MSB */
-};
+} __packed;
 
 /* 32-byte reduced form of an ondisk inode */
 struct erofs_inode_compact {
@@ -369,9 +369,9 @@ struct z_erofs_map_header {
 			 * bit 7   : pack the whole file into packed inode
 			 */
 			__u8	h_clusterbits;
-		};
+		} __packed;
 		__le16 h_extents_hi;	/* extent count MSB */
-	};
+	} __packed;
 };
 
 enum {

fs/erofs/fileio.c

@@ -32,6 +32,8 @@ static void erofs_fileio_ki_complete(struct kiocb *iocb, long ret)
 		ret = 0;
 	}
 	if (rq->bio.bi_end_io) {
+		if (ret < 0 && !rq->bio.bi_status)
+			rq->bio.bi_status = errno_to_blk_status(ret);
 		rq->bio.bi_end_io(&rq->bio);
 	} else {
 		bio_for_each_folio_all(fi, &rq->bio) {

fs/erofs/zdata.c

@@ -725,7 +725,6 @@ static int z_erofs_register_pcluster(struct z_erofs_frontend *fe)
 	lockref_init(&pcl->lockref); /* one ref for this request */
 	pcl->algorithmformat = map->m_algorithmformat;
 	pcl->pclustersize = map->m_plen;
-	pcl->pageofs_in = pageofs_in;
 	pcl->length = 0;
 	pcl->partial = true;
 	pcl->next = fe->head;

fs/erofs/zmap.c

@@ -559,7 +559,8 @@ static int z_erofs_map_blocks_ext(struct inode *inode,
 			pos += sizeof(__le64);
 			lstart = 0;
 		} else {
-			lstart = map->m_la >> vi->z_lclusterbits;
+			lstart = round_down(map->m_la, 1 << vi->z_lclusterbits);
+			pos += (lstart >> vi->z_lclusterbits) * recsz;
 			pa = EROFS_NULL_ADDR;
 		}
 
@@ -614,7 +615,7 @@ static int z_erofs_map_blocks_ext(struct inode *inode,
 		if (last && (vi->z_advise & Z_EROFS_ADVISE_FRAGMENT_PCLUSTER)) {
 			map->m_flags |= EROFS_MAP_MAPPED | EROFS_MAP_FRAGMENT;
 			vi->z_fragmentoff = map->m_plen;
-			if (recsz >= offsetof(struct z_erofs_extent, pstart_lo))
+			if (recsz > offsetof(struct z_erofs_extent, pstart_lo))
 				vi->z_fragmentoff |= map->m_pa << 32;
 		} else if (map->m_plen) {
 			map->m_flags |= EROFS_MAP_MAPPED |