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fs: fat: correct first cluster for '..'

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The FAT specification [1] requires that for a '..' directory entry pointing
to the root directory the fields DIR_FstClusHi and DIR_FstClusLo are 0.

[1] Microsoft FAT Specification, Microsoft Corporation, August 30 2005

Fixes: 31a18d570d ("fs: fat: support mkdir")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Heinrich Schuchardt 2020-11-24 21:04:07 +01:00
parent 03f1f78a9b
commit c5924118c0
1 changed files with 5 additions and 1 deletions
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6
fs/fat/fat_write.c
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@ -1468,7 +1468,11 @@ int fat_mkdir(const char *new_dirname)
memcpy(dotdent[1].name, ".. ", 8);
memcpy(dotdent[1].ext, " ", 3);
dotdent[1].attr = ATTR_DIR | ATTR_ARCH;
set_start_cluster(mydata, &dotdent[1], itr->start_clust);
if (itr->is_root)
set_start_cluster(mydata, &dotdent[1], 0);
else
set_start_cluster(mydata, &dotdent[1], itr->start_clust);
ret = set_contents(mydata, retdent, 0, (__u8 *)dotdent,
bytesperclust, &actwrite);