[PATCH] e2fsprogs: fix file system generation with large files

[PATCH] e2fsprogs: fix file system generation with large files

[Ross Burton]

When copying files into the file system the file offset was being truncated to a
signed 32-bit value, so any files that are larger than 2^31 bytes were the right
size, but no content after that point.

Signed-off-by: Ross Burton <ross.burton@intel.com>
---
 ...0001-create_inode-fix-copying-large-files.patch | 47 ++++++++++++++++++++++
 .../recipes-devtools/e2fsprogs/e2fsprogs_1.44.3.bb |  1 +
 2 files changed, 48 insertions(+)
 create mode 100644 meta/recipes-devtools/e2fsprogs/e2fsprogs/0001-create_inode-fix-copying-large-files.patch

diff --git a/meta/recipes-devtools/e2fsprogs/e2fsprogs/0001-create_inode-fix-copying-large-files.patch b/meta/recipes-devtools/e2fsprogs/e2fsprogs/0001-create_inode-fix-copying-large-files.patch
new file mode 100644
index 00000000000..93fd998fe4d
--- /dev/null
+++ b/meta/recipes-devtools/e2fsprogs/e2fsprogs/0001-create_inode-fix-copying-large-files.patch
@@ -0,0 +1,47 @@
+From 674ab87b8338372338d20e21a350f88b4ff6c7c8 Mon Sep 17 00:00:00 2001
+From: Ross Burton <ross.burton@intel.com>
+Date: Fri, 1 Feb 2019 10:59:59 +0000
+Subject: [PATCH] create_inode: fix copying large files
+
+When copying large files into a ext filesystem at mkfs time the copy fails at
+2^31 bytes in.  There are two problems:
+
+copy_file_chunk() passes an offset (off_t, 64-bit typically) to
+ext2fs_file_lseek() which expects a ext2_off_t (typedef to __u32) so the value
+is truncated. Solve by calling ext2fs_file_llseek() which takes a u64 offset
+instead.
+
+try_lseek_copy() rounds the data and hole offsets as found by lseek() to block
+boundaries, but the calculation gets truncated to 32-bits.  Solve by casting the
+32-bit blocksize to off_t to ensure this doesn't happen.
+
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+---
+ misc/create_inode.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/misc/create_inode.c b/misc/create_inode.c
+index 05aa6363..f106dcda 100644
+--- a/misc/create_inode.c
++++ b/misc/create_inode.c
+@@ -438,7 +438,7 @@ static errcode_t copy_file_chunk(ext2_filsys fs, int fd, ext2_file_t e2_file,
+ 				ptr += blen;
+ 				continue;
+ 			}
+-			err = ext2fs_file_lseek(e2_file, off + bpos,
++			err = ext2fs_file_llseek(e2_file, off + bpos,
+ 						EXT2_SEEK_SET, NULL);
+ 			if (err)
+ 				goto fail;
+@@ -481,7 +481,7 @@ static errcode_t try_lseek_copy(ext2_filsys fs, int fd, struct stat *statbuf,
+ 			return EXT2_ET_UNIMPLEMENTED;
+ 
+ 		data_blk = data & ~(fs->blocksize - 1);
+-		hole_blk = (hole + (fs->blocksize - 1)) & ~(fs->blocksize - 1);
++		hole_blk = (hole + (off_t)(fs->blocksize - 1)) & ~(off_t)(fs->blocksize - 1);
+ 		err = copy_file_chunk(fs, fd, e2_file, data_blk, hole_blk, buf,
+ 				      zerobuf);
+ 		if (err)
+-- 
+2.11.0
+
diff --git a/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.44.3.bb b/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.44.3.bb
index ce95dec5fec..720eaff06a3 100644
--- a/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.44.3.bb
+++ b/meta/recipes-devtools/e2fsprogs/e2fsprogs_1.44.3.bb
@@ -9,6 +9,7 @@ SRC_URI += "file://remove.ldconfig.call.patch \
             "
 
 SRC_URI_append_class-native = " file://e2fsprogs-fix-missing-check-for-permission-denied.patch \
+            file://0001-create_inode-fix-copying-large-files.patch \
                                 file://quiet-debugfs.patch \
 "
 
-- 
2.11.0