Merge tag 'erofs-for-6.11-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs

Pull more erofs updates from Gao Xiang:

 - Support STATX_DIOALIGN and FS_IOC_GETFSSYSFSPATH

 - Fix a race of LZ4 decompression due to recent refactoring

 - Another multi-page folio adaption in erofs_bread()

* tag 'erofs-for-6.11-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
  erofs: convert comma to semicolon
  erofs: support multi-page folios for erofs_bread()
  erofs: add support for FS_IOC_GETFSSYSFSPATH
  erofs: fix race in z_erofs_get_gbuf()
  erofs: support STATX_DIOALIGN

Author: torvalds

fs/erofs/data.c

@@ -21,38 +21,32 @@ void erofs_put_metabuf(struct erofs_buf *buf)
 	if (!buf->page)
 		return;
 	erofs_unmap_metabuf(buf);
-	put_page(buf->page);
+	folio_put(page_folio(buf->page));
 	buf->page = NULL;
 }
 
-/*
- * Derive the block size from inode->i_blkbits to make compatible with
- * anonymous inode in fscache mode.
- */
 void *erofs_bread(struct erofs_buf *buf, erofs_off_t offset,
 		  enum erofs_kmap_type type)
 {
 	pgoff_t index = offset >> PAGE_SHIFT;
-	struct page *page = buf->page;
-	struct folio *folio;
-	unsigned int nofs_flag;
+	struct folio *folio = NULL;
 
-	if (!page || page->index != index) {
+	if (buf->page) {
+		folio = page_folio(buf->page);
+		if (folio_file_page(folio, index) != buf->page)
+			erofs_unmap_metabuf(buf);
+	}
+	if (!folio || !folio_contains(folio, index)) {
 		erofs_put_metabuf(buf);
-
-		nofs_flag = memalloc_nofs_save();
-		folio = read_cache_folio(buf->mapping, index, NULL, NULL);
-		memalloc_nofs_restore(nofs_flag);
+		folio = read_mapping_folio(buf->mapping, index, NULL);
 		if (IS_ERR(folio))
 			return folio;
-
-		/* should already be PageUptodate, no need to lock page */
-		page = folio_file_page(folio, index);
-		buf->page = page;
 	}
+	buf->page = folio_file_page(folio, index);
+
 	if (buf->kmap_type == EROFS_NO_KMAP) {
 		if (type == EROFS_KMAP)
-			buf->base = kmap_local_page(page);
+			buf->base = kmap_local_page(buf->page);
 		buf->kmap_type = type;
 	} else if (buf->kmap_type != type) {
 		DBG_BUGON(1);

fs/erofs/decompressor_lzma.c

@@ -188,7 +188,7 @@ static int z_erofs_lzma_decompress(struct z_erofs_decompress_req *rq,
 			       !rq->partial_decoding);
 	buf.in_size = min(rq->inputsize, PAGE_SIZE - rq->pageofs_in);
 	rq->inputsize -= buf.in_size;
-	buf.in = dctx.kin + rq->pageofs_in,
+	buf.in = dctx.kin + rq->pageofs_in;
 	dctx.bounce = strm->bounce;
 	do {
 		dctx.avail_out = buf.out_size - buf.out_pos;

fs/erofs/inode.c

@@ -334,14 +334,29 @@ int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
 		  unsigned int query_flags)
 {
 	struct inode *const inode = d_inode(path->dentry);
+	bool compressed =
+		erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout);
 
-	if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout))
+	if (compressed)
 		stat->attributes |= STATX_ATTR_COMPRESSED;
-
 	stat->attributes |= STATX_ATTR_IMMUTABLE;
 	stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
 				  STATX_ATTR_IMMUTABLE);
 
+	/*
+	 * Return the DIO alignment restrictions if requested.
+	 *
+	 * In EROFS, STATX_DIOALIGN is not supported in ondemand mode and
+	 * compressed files, so in these cases we report no DIO support.
+	 */
+	if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) {
+		stat->result_mask |= STATX_DIOALIGN;
+		if (!erofs_is_fscache_mode(inode->i_sb) && !compressed) {
+			stat->dio_mem_align =
+				bdev_logical_block_size(inode->i_sb->s_bdev);
+			stat->dio_offset_align = stat->dio_mem_align;
+		}
+	}
 	generic_fillattr(idmap, request_mask, inode, stat);
 	return 0;
 }

fs/erofs/super.c

@@ -576,6 +576,21 @@ static const struct export_operations erofs_export_ops = {
 	.get_parent = erofs_get_parent,
 };
 
+static void erofs_set_sysfs_name(struct super_block *sb)
+{
+	struct erofs_sb_info *sbi = EROFS_SB(sb);
+
+	if (erofs_is_fscache_mode(sb)) {
+		if (sbi->domain_id)
+			super_set_sysfs_name_generic(sb, "%s,%s",sbi->domain_id,
+						     sbi->fsid);
+		else
+			super_set_sysfs_name_generic(sb, "%s", sbi->fsid);
+		return;
+	}
+	super_set_sysfs_name_id(sb);
+}
+
 static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
 {
 	struct inode *inode;
@@ -643,6 +658,7 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
 		sb->s_flags |= SB_POSIXACL;
 	else
 		sb->s_flags &= ~SB_POSIXACL;
+	erofs_set_sysfs_name(sb);
 
 #ifdef CONFIG_EROFS_FS_ZIP
 	xa_init(&sbi->managed_pslots);

fs/erofs/zutil.c

@@ -38,11 +38,13 @@ void *z_erofs_get_gbuf(unsigned int requiredpages)
 {
 	struct z_erofs_gbuf *gbuf;
 
+	migrate_disable();
 	gbuf = &z_erofs_gbufpool[z_erofs_gbuf_id()];
 	spin_lock(&gbuf->lock);
 	/* check if the buffer is too small */
 	if (requiredpages > gbuf->nrpages) {
 		spin_unlock(&gbuf->lock);
+		migrate_enable();
 		/* (for sparse checker) pretend gbuf->lock is still taken */
 		__acquire(gbuf->lock);
 		return NULL;
@@ -57,6 +59,7 @@ void z_erofs_put_gbuf(void *ptr) __releases(gbuf->lock)
 	gbuf = &z_erofs_gbufpool[z_erofs_gbuf_id()];
 	DBG_BUGON(gbuf->ptr != ptr);
 	spin_unlock(&gbuf->lock);
+	migrate_enable();
 }
 
 int z_erofs_gbuf_growsize(unsigned int nrpages)