[PATCH v1 2/2] Add API to get on disk size of an inode

[Kelvin Zhang via Linux-erofs <linux-erofs@lists.ozlabs.org>]

Change-Id: I60fa9346737b14418bd3fa1d12f760aaf0a0cca5
Signed-off-by: Kelvin Zhang <zhangkelvin@google.com>
---
 dump/main.c              |  4 ++--
 include/erofs/internal.h |  2 ++
 lib/data.c               | 21 +++++++++++++++++++++
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/dump/main.c b/dump/main.c
index 71b44b4..cdde561 100644
--- a/dump/main.c
+++ b/dump/main.c
@@ -175,7 +175,7 @@ static int erofsdump_parse_options_cfg(int argc, char **argv)
 	return 0;
 }
 
-static int erofs_get_occupied_size(struct erofs_inode *inode,
+static int dump_get_occupied_size(struct erofs_inode *inode,
 		erofs_off_t *size)
 {
 	*size = 0;
@@ -291,7 +291,7 @@ static int erofs_read_dirent(struct erofs_dirent *de,
 		return err;
 	}
 
-	err = erofs_get_occupied_size(&inode, &occupied_size);
+	err = dump_get_occupied_size(&inode, &occupied_size);
 	if (err) {
 		erofs_err("get file size failed\n");
 		return err;
diff --git a/include/erofs/internal.h b/include/erofs/internal.h
index 947304f..8f13e69 100644
--- a/include/erofs/internal.h
+++ b/include/erofs/internal.h
@@ -320,6 +320,8 @@ int erofs_pread(struct erofs_inode *inode, char *buf,
 int erofs_map_blocks(struct erofs_inode *inode,
 		struct erofs_map_blocks *map, int flags);
 int erofs_map_dev(struct erofs_sb_info *sbi, struct erofs_map_dev *map);
+int erofs_get_occupied_size(const struct erofs_inode *inode,
+			    erofs_off_t *size);
 /* zmap.c */
 int z_erofs_fill_inode(struct erofs_inode *vi);
 int z_erofs_map_blocks_iter(struct erofs_inode *vi,
diff --git a/lib/data.c b/lib/data.c
index 27710f9..92e54b5 100644
--- a/lib/data.c
+++ b/lib/data.c
@@ -320,3 +320,24 @@ int erofs_pread(struct erofs_inode *inode, char *buf,
 	}
 	return -EINVAL;
 }
+
+int erofs_get_occupied_size(const struct erofs_inode *inode,
+			    erofs_off_t *size)
+{
+	*size = 0;
+	switch (inode->datalayout) {
+	case EROFS_INODE_FLAT_INLINE:
+	case EROFS_INODE_FLAT_PLAIN:
+	case EROFS_INODE_CHUNK_BASED:
+		*size = inode->i_size;
+		break;
+	case EROFS_INODE_FLAT_COMPRESSION_LEGACY:
+	case EROFS_INODE_FLAT_COMPRESSION:
+		*size = inode->u.i_blocks * EROFS_BLKSIZ;
+		break;
+	default:
+		erofs_err("unknown datalayout");
+		return -1;
+	}
+	return 0;
+}
-- 
2.34.1.307.g9b7440fafd-goog