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authorSébastien Szymanski <sebastien.szymanski@armadeus.com>2019-03-22 09:33:52 +0100
committerTom Rini <trini@konsulko.com>2019-03-22 12:15:24 -0400
commit2e7365518acdb8fb6e9be332c8a6c57b457188d9 (patch)
tree5951f299b8b05cb6011deb8522a8b883a5d260e2
parent50580a0e7053599abdaa467cb43cff0c66564369 (diff)
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fs: ext4: do not write on filesystem with metadata_csum feature
U-Boot doesn't support metadata_csum feature. Writing to filesystem with metadata_csum feature makes the filesystem corrupted and unbootable by Linux: [ 2.527495] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 0 failed (52188!=0) [ 2.537421] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 1 failed (5262!=0) ... [ 2.653308] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 14 failed (42611!=0) [ 2.662179] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 15 failed (21527!=0) [ 2.687920] JBD2: journal checksum error [ 2.691982] EXT4-fs (mmcblk0p2): error loading journal [ 2.698292] VFS: Cannot open root device "mmcblk0p2" or unknown-block(179,2): error -74 Don't write to filesystem with meatadata_csum feature to not corrupt the filesystem. Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
-rw-r--r--fs/ext4/ext4_write.c6
-rw-r--r--include/ext4fs.h1
2 files changed, 7 insertions, 0 deletions
diff --git a/fs/ext4/ext4_write.c b/fs/ext4/ext4_write.c
index a7f543f..4eb77c3 100644
--- a/fs/ext4/ext4_write.c
+++ b/fs/ext4/ext4_write.c
@@ -864,6 +864,12 @@ int ext4fs_write(const char *fname, unsigned char *buffer,
printf("error in File System init\n");
return -1;
}
+
+ if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) {
+ printf("Unsupported feature metadata_csum found, not writing.\n");
+ return -1;
+ }
+
inodes_per_block = fs->blksz / fs->inodesz;
parent_inodeno = ext4fs_get_parent_inode_num(fname, filename, F_FILE);
if (parent_inodeno == -1)
diff --git a/include/ext4fs.h b/include/ext4fs.h
index bb55639..2421011 100644
--- a/include/ext4fs.h
+++ b/include/ext4fs.h
@@ -32,6 +32,7 @@
#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
#define EXT4_EXT_MAGIC 0xf30a
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
+#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
#define EXT4_INDIRECT_BLOCKS 12