[RFC PATCH] erofs-utils: fsck: support fragments

[Yue Hu <zbestahu@gmail.com>]

From: Yue Hu <huyue2@coolpad.com>

Add compressed fragments support for fsck.erofs.

Signed-off-by: Yue Hu <huyue2@coolpad.com>
---
 fsck/main.c | 41 +++++++++++++++++++++++++++++++++++++++--
 lib/zmap.c  |  1 +
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/fsck/main.c b/fsck/main.c
index 2a9c501..9babc61 100644
--- a/fsck/main.c
+++ b/fsck/main.c
@@ -421,6 +421,31 @@ static int erofs_verify_inode_data(struct erofs_inode *inode, int outfd)
 		if (!(map.m_flags & EROFS_MAP_MAPPED) || !fsckcfg.check_decomp)
 			continue;
 
+		if (map.m_flags & EROFS_MAP_FRAGMENT) {
+			struct erofs_inode packed_inode = {
+				.nid = sbi.packed_nid,
+			};
+
+			ret = erofs_read_inode_from_disk(&packed_inode);
+			if (ret) {
+				erofs_err("failed to read packed inode from disk");
+				goto out;
+			}
+
+			if (!buffer || map.m_llen > buffer_size) {
+				buffer_size = map.m_llen;
+				buffer = realloc(buffer, map.m_llen);
+				BUG_ON(!buffer);
+			}
+			ret = erofs_pread(&packed_inode, buffer, map.m_llen,
+					  inode->fragmentoff);
+			if (ret)
+				goto out;
+
+			compressed = true;	/* force using buffer */
+			goto write_outfd;
+		}
+
 		if (map.m_plen > raw_size) {
 			raw_size = map.m_plen;
 			raw = realloc(raw, raw_size);
@@ -476,6 +501,7 @@ static int erofs_verify_inode_data(struct erofs_inode *inode, int outfd)
 			}
 		}
 
+write_outfd:
 		if (outfd >= 0 && write(outfd, compressed ? buffer : raw,
 					map.m_llen) < 0) {
 			erofs_err("I/O error occurred when verifying data chunk @ nid %llu",
@@ -486,8 +512,9 @@ static int erofs_verify_inode_data(struct erofs_inode *inode, int outfd)
 	}
 
 	if (fsckcfg.print_comp_ratio) {
-		fsckcfg.logical_blocks += BLK_ROUND_UP(inode->i_size);
 		fsckcfg.physical_blocks += BLK_ROUND_UP(pchunk_len);
+		if (!erofs_is_packed_inode(inode))
+			fsckcfg.logical_blocks += BLK_ROUND_UP(inode->i_size);
 	}
 out:
 	if (raw)
@@ -732,6 +759,8 @@ static int erofsfsck_check_inode(erofs_nid_t pnid, erofs_nid_t nid)
 			ret = erofs_extract_dir(&inode);
 			break;
 		case S_IFREG:
+			if (erofs_is_packed_inode(&inode))
+				goto verify;
 			ret = erofs_extract_file(&inode);
 			break;
 		case S_IFLNK:
@@ -767,7 +796,7 @@ verify:
 		ret = erofs_iterate_dir(&ctx, true);
 	}
 
-	if (!ret)
+	if (!ret && !erofs_is_packed_inode(&inode))
 		erofsfsck_set_attributes(&inode, fsckcfg.extract_path);
 
 	if (ret == -ECANCELED)
@@ -822,6 +851,14 @@ int main(int argc, char **argv)
 		goto exit_put_super;
 	}
 
+	if (erofs_sb_has_fragments()) {
+		err = erofsfsck_check_inode(sbi.packed_nid, sbi.packed_nid);
+		if (err) {
+			erofs_err("failed to verify packed file");
+			goto exit_put_super;
+		}
+	}
+
 	err = erofsfsck_check_inode(sbi.root_nid, sbi.root_nid);
 	if (fsckcfg.corrupted) {
 		if (!fsckcfg.extract_path)
diff --git a/lib/zmap.c b/lib/zmap.c
index 41e0713..ca65038 100644
--- a/lib/zmap.c
+++ b/lib/zmap.c
@@ -639,6 +639,7 @@ static int z_erofs_do_map_blocks(struct erofs_inode *vi,
 		map->m_plen = vi->z_idata_size;
 	} else if (fragment && m.lcn == vi->z_tailextent_headlcn) {
 		map->m_flags |= EROFS_MAP_FRAGMENT;
+		map->m_plen = 0;
 	} else {
 		map->m_pa = blknr_to_addr(m.pblk);
 		err = z_erofs_get_extent_compressedlen(&m, initial_lcn);
-- 
2.17.1