yushuailong commented on code in PR #21462:
URL: https://github.com/apache/nuttx/pull/21462#discussion_r4481219969
##########
fs/fat/fs_fat32.c:
##########
@@ -2840,12 +2848,37 @@ static int fat_truncate(FAR struct file *filep, off_t
length)
}
else
{
+ off_t savepos;
+
/* Otherwise we are extending the file. This is essentially the same
* as a write except that (1) we write zeros and (2) we don't update
* the file position.
*/
+ ret = fat_shared_invalidate(fs, ff->ff_shared);
+ if (ret < 0)
+ {
+ goto errout_with_lock;
+ }
+
+ /* Position the traversal cursor at EOF. The caller's file offset
+ * can be anywhere, and a newly opened handle starts at the first
+ * cluster of the file.
+ */
+
+ savepos = filep->f_pos;
+ filep->f_pos = oldsize;
+ ret = fat_get_sectors(filep, false);
Review Comment:
done
##########
fs/fat/fs_fat32.c:
##########
@@ -2840,12 +2848,37 @@ static int fat_truncate(FAR struct file *filep, off_t
length)
}
else
{
+ off_t savepos;
+
/* Otherwise we are extending the file. This is essentially the same
* as a write except that (1) we write zeros and (2) we don't update
* the file position.
*/
+ ret = fat_shared_invalidate(fs, ff->ff_shared);
+ if (ret < 0)
+ {
+ goto errout_with_lock;
+ }
+
+ /* Position the traversal cursor at EOF. The caller's file offset
+ * can be anywhere, and a newly opened handle starts at the first
+ * cluster of the file.
+ */
+
+ savepos = filep->f_pos;
+ filep->f_pos = oldsize;
+ ret = fat_get_sectors(filep, false);
+ filep->f_pos = savepos;
+ if (ret < 0)
+ {
+ fat_shared_reset_cursors(fs, ff->ff_shared);
+ goto errout_with_lock;
+ }
+
+ ff->ff_bflags |= FFBUFF_MODIFIED;
ret = fat_dirextend(fs, ff, length);
Review Comment:
done
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