e2fsprogs: properly set up extent header in do_write

do_write doesn't fully set up the first extent header on a new
inode, so if we write a 0-length file, and don't write any data
to the new file, we end up creating something that looks corrupt
to kernelspace:

EXT4-fs error (device loop0): ext4_ext_check_inode:464: inode #12: comm
ls: bad header/extent: invalid magic - magic 0, entries 0, max 0(0),
depth 0(0)

Do something similar to ext4_ext_tree_init() here, and
fill out the first extent header upon creation to avoid this.

[YOCTO #3848]

(From OE-Core rev: 7d1e51681d25f6e6d2c20744825723ad5c83861c)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 49 insertions, 0 deletions

diff --git a/meta/recipes-devtools/e2fsprogs/e2fsprogs-1.42.8/debugfs-extent-header.patch b/meta/recipes-devtools/e2fsprogs/e2fsprogs-1.42.8/debugfs-extent-header.patch
new file mode 100644
index 0000000000..ae44730192
--- /dev/null
+++ b/meta/recipes-devtools/e2fsprogs/e2fsprogs-1.42.8/debugfs-extent-header.patch
@@ -0,0 +1,47 @@
+debugfs: properly set up extent header in do_write
+
+do_write doesn't fully set up the first extent header on a new
+inode, so if we write a 0-length file, and don't write any data
+to the new file, we end up creating something that looks corrupt
+to kernelspace:
+
+EXT4-fs error (device loop0): ext4_ext_check_inode:464: inode #12: comm ls: bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
+
+Do something similar to ext4_ext_tree_init() here, and
+fill out the first extent header upon creation to avoid this.
+
+Upstream-Status: Backport
+
+Reported-by: Robert Yang <liezhi.yang@windriver.com>
+Signed-off-by: Eric Sandeen <sandeen@redhat.com>
+---
+ debugfs/debugfs.c | 13 ++++++++++++-
+ 1 file changed, 12 insertions(+), 1 deletion(-)
+
+diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
+--- a/debugfs/debugfs.c
++++ b/debugfs/debugfs.c
+@@ -1726,8 +1726,19 @@ void do_write(int argc, char *argv[])
+        inode.i_links_count = 1;
+        inode.i_size = statbuf.st_size;
+        if (current_fs->super->s_feature_incompat &
+-           EXT3_FEATURE_INCOMPAT_EXTENTS)
++           EXT3_FEATURE_INCOMPAT_EXTENTS) {
++               int i;
++               struct ext3_extent_header *eh;
++
++               eh = (struct ext3_extent_header *) &inode.i_block[0];
++               eh->eh_depth = 0;
++               eh->eh_entries = 0;
++               eh->eh_magic = EXT3_EXT_MAGIC;
++               i = (sizeof(inode.i_block) - sizeof(*eh)) /
++                       sizeof(struct ext3_extent);
++               eh->eh_max = ext2fs_cpu_to_le16(i);
+                inode.i_flags |= EXT4_EXTENTS_FL;
++       }
+        if (debugfs_write_new_inode(newfile, &inode, argv[0])) {
+                close(fd);
+                return;
+-- 
+1.8.1.2
+
diff --git a/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.42.8.bb b/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.42.8.bb
index 2681f98f00..b54c6a7685 100644
--- a/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.42.8.bb
+++ b/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.42.8.bb
@@ -6,6 +6,8 @@ SRC_URI += "file://acinclude.m4 \
             file://debugfs-too-short.patch \
             file://debugfs-sparse-copy.patch \
             file://fix-icache.patch \
+            file://debugfs-extent-header.patch \
+            file://populate-extfs.sh \
 "
 
 SRC_URI[md5sum] = "8ef664b6eb698aa6b733df59b17b9ed4"