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[U-Boot,v3,13/26] fs: fat: remember the starting cluster number of directory

Message ID 20180911065922.19141-14-takahiro.akashi@linaro.org
State Accepted
Commit 3a10e07234e5f545ca70088e99f27d6098201449
Headers show
Series subject: fs: fat: extend FAT write operations | expand

Commit Message

AKASHI Takahiro Sept. 11, 2018, 6:59 a.m. UTC
From: AKASHI Takahiro <takahiro.akashi@linaro.org>

The starting cluster number of directory is needed to initialize ".."
(parent directory) entry when creating a new directory.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
---
 fs/fat/fat.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 5aa28656c7d5..10741925bdd4 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -631,6 +631,7 @@  static int get_fs_info(fsdata *mydata)
 
 typedef struct {
 	fsdata    *fsdata;        /* filesystem parameters */
+	unsigned   start_clust;   /* first cluster */
 	unsigned   clust;         /* current cluster */
 	unsigned   next_clust;    /* next cluster if remaining == 0 */
 	int        last_cluster;  /* set once we've read last cluster */
@@ -663,6 +664,7 @@  static int fat_itr_root(fat_itr *itr, fsdata *fsdata)
 		return -ENXIO;
 
 	itr->fsdata = fsdata;
+	itr->start_clust = 0;
 	itr->clust = fsdata->root_cluster;
 	itr->next_clust = fsdata->root_cluster;
 	itr->dent = NULL;
@@ -698,6 +700,7 @@  static void fat_itr_child(fat_itr *itr, fat_itr *parent)
 	assert(fat_itr_isdir(parent));
 
 	itr->fsdata = parent->fsdata;
+	itr->start_clust = clustnum;
 	if (clustnum > 0) {
 		itr->clust = clustnum;
 		itr->next_clust = clustnum;