[U-Boot] [PATCH v2 3/5] fs: fat: allocate a new cluster for root directory of fat32

[AKASHI Takahiro]

Contrary to fat12/16, fat32 can have root directory at any location
and its size can be expanded.
Without this patch, root directory won't grow properly and so we will
eventually fail to add files under root directory. Please note that this
can happen even if you delete many files as deleted directory entries
are not reclaimed but just marked as "deleted" under the current
implementation.

Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
Tested-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 fs/fat/fat_write.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
index da1753d545ac..3bb9eac097eb 100644
--- a/fs/fat/fat_write.c
+++ b/fs/fat/fat_write.c
@@ -247,8 +247,11 @@ fill_dir_slot(fat_itr *itr, const char *l_name)
 		if (itr->remaining == 0)
 			flush_dir(itr);
 
+		/* allocate a cluster for more entries */
 		if (!fat_itr_next(itr))
-			if (!itr->dent && !itr->is_root && new_dir_table(itr))
+			if (!itr->dent &&
+			    (!itr->is_root || itr->fsdata->fatsize == 32) &&
+			    new_dir_table(itr))
 				return -1;
 	}
 
@@ -980,7 +983,10 @@ static dir_entry *find_directory_entry(fat_itr *itr, char *filename)
 			return itr->dent;
 	}
 
-	if (!itr->dent && !itr->is_root && new_dir_table(itr))
+	/* allocate a cluster for more entries */
+	if (!itr->dent &&
+	    (!itr->is_root || itr->fsdata->fatsize == 32) &&
+	    new_dir_table(itr))
 		/* indicate that allocating dent failed */
 		itr->dent = NULL;
 
-- 
2.21.0