fs: sysfs: return EGBIG on write if offset is larger than file size
According to the user expectations common utilities like dd or sh
redirection operator > should work correctly over binary files from
sysfs. At the moment doing excessive write can not be completed:
write(1, "\0\0\0\0\0\0\0\0", 8) = 4
write(1, "\0\0\0\0", 4) = 0
write(1, "\0\0\0\0", 4) = 0
write(1, "\0\0\0\0", 4) = 0
...
Fix the problem by returning EFBIG described in man 2 write.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index e9ef59b..589abee 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -125,7 +125,7 @@
if (size) {
if (size <= pos)
- return 0;
+ return -EFBIG;
count = min_t(ssize_t, count, size - pos);
}
if (!count)