readdir() doesn't always return . and .. entries at first and in that order. This leads to not creating them at first in the directory, which raises some errors on file system checking utilities like MS-DOS Scandisk.
Specification: "FAT: General overview of on-disk format" v1.03, page 25 Fixes: https://bugs.launchpad.net/qemu/+bug/1599539 Signed-off-by: Hervé Poussineau <[email protected]> --- block/vvfat.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/block/vvfat.c b/block/vvfat.c index 348cffe1c4..7da07068b8 100644 --- a/block/vvfat.c +++ b/block/vvfat.c @@ -721,6 +721,12 @@ static int read_directory(BDRVVVFATState* s, int mapping_index) i = mapping->info.dir.first_dir_index = first_cluster == 0 ? 0 : s->directory.next; + if (first_cluster != 0) { + /* create the top entries of a subdirectory */ + (void)create_short_and_long_name(s, i, ".", 1); + (void)create_short_and_long_name(s, i, "..", 1); + } + /* actually read the directory, and allocate the mappings */ while((entry=readdir(dir))) { unsigned int length=strlen(dirname)+2+strlen(entry->d_name); @@ -742,8 +748,11 @@ static int read_directory(BDRVVVFATState* s, int mapping_index) } /* create directory entry for this file */ - direntry=create_short_and_long_name(s, i, entry->d_name, - is_dot || is_dotdot); + if (!is_dot && !is_dotdot) { + direntry = create_short_and_long_name(s, i, entry->d_name, 0); + } else { + direntry = array_get(&(s->directory), is_dot ? i : i + 1); + } direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20); direntry->reserved[0]=direntry->reserved[1]=0; direntry->ctime=fat_datetime(st.st_ctime,1); -- 2.11.0
