From 39b6a3fcbfa75b7b02fcfa895128d15437adf583 Mon Sep 17 00:00:00 2001
From: Vamshi Gajjela <vamshi.gajjela@espressif.com>
Date: Thu, 17 Mar 2022 14:57:32 +0530
Subject: [PATCH] vfs: bugfix vfs_fat_write/pwrite upon disk-full

Closes https://github.com/espressif/esp-idf/issues/5027
---
 components/fatfs/vfs/vfs_fat.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/components/fatfs/vfs/vfs_fat.c b/components/fatfs/vfs/vfs_fat.c
index 1ce28a1670..b6dea429ee 100644
--- a/components/fatfs/vfs/vfs_fat.c
+++ b/components/fatfs/vfs/vfs_fat.c
@@ -375,6 +375,10 @@ static ssize_t vfs_fat_write(void* ctx, int fd, const void * data, size_t size)
     }
     unsigned written = 0;
     res = f_write(file, data, size, &written);
+    if (((written == 0) && (size != 0)) && (res == 0)) {
+        errno = ENOSPC;
+        return -1;
+    }
     if (res != FR_OK) {
         ESP_LOGD(TAG, "%s: fresult=%d", __func__, res);
         errno = fresult_to_errno(res);
@@ -459,6 +463,10 @@ static ssize_t vfs_fat_pwrite(void *ctx, int fd, const void *src, size_t size, o
 
     unsigned wr = 0;
     f_res = f_write(file, src, size, &wr);
+    if (((wr == 0) && (size != 0)) && (f_res == 0)) {
+        errno = ENOSPC;
+        return -1;
+    }
     if (f_res == FR_OK) {
         ret = wr;
     } else {