libext2fs: set the large_file feature flag when setting i_size > 2GB
If someone tries to write a file that is larger than 2GB, we need to
set the large_file feature flag to affirm that i_size_hi can hold
meaningful contents.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/lib/ext2fs/fileio.c b/lib/ext2fs/fileio.c
index 1f7002c..ae5cbf1 100644
--- a/lib/ext2fs/fileio.c
+++ b/lib/ext2fs/fileio.c
@@ -389,6 +389,18 @@
old_truncate = ((old_size + file->fs->blocksize - 1) >>
EXT2_BLOCK_SIZE_BITS(file->fs->super)) + 1;
+ /* If we're writing a large file, set the large_file flag */
+ if (LINUX_S_ISREG(file->inode.i_mode) &&
+ EXT2_I_SIZE(&file->inode) > 0x7FFFFFFULL &&
+ (!EXT2_HAS_RO_COMPAT_FEATURE(file->fs->super,
+ EXT2_FEATURE_RO_COMPAT_LARGE_FILE) ||
+ file->fs->super->s_rev_level == EXT2_GOOD_OLD_REV)) {
+ file->fs->super->s_feature_ro_compat |=
+ EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
+ ext2fs_update_dynamic_rev(file->fs);
+ ext2fs_mark_super_dirty(file->fs);
+ }
+
file->inode.i_size = size & 0xffffffff;
file->inode.i_size_high = (size >> 32);
if (file->ino) {