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authorAl Viro <viro@zeniv.linux.org.uk>2015-12-05 22:04:48 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-23 10:41:31 -0500
commitb25472f9b96159cc0b9b7ed449448805973cd789 (patch)
tree7963f6d5adc2a82f6f10b4f9cf427ce931f67c76 /fs/read_write.c
parentb808b1d632f6915e4d6b1badb927b2c970ad11bb (diff)
new helpers: no_seek_end_llseek{,_size}()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 819ef3faf1bb..acb171331278 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -171,6 +171,45 @@ loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t si
EXPORT_SYMBOL(fixed_size_llseek);
/**
+ * no_seek_end_llseek - llseek implementation for fixed-sized devices
+ * @file: file structure to seek on
+ * @offset: file offset to seek to
+ * @whence: type of seek
+ *
+ */
+loff_t no_seek_end_llseek(struct file *file, loff_t offset, int whence)
+{
+ switch (whence) {
+ case SEEK_SET: case SEEK_CUR:
+ return generic_file_llseek_size(file, offset, whence,
+ ~0ULL, 0);
+ default:
+ return -EINVAL;
+ }
+}
+EXPORT_SYMBOL(no_seek_end_llseek);
+
+/**
+ * no_seek_end_llseek_size - llseek implementation for fixed-sized devices
+ * @file: file structure to seek on
+ * @offset: file offset to seek to
+ * @whence: type of seek
+ * @size: maximal offset allowed
+ *
+ */
+loff_t no_seek_end_llseek_size(struct file *file, loff_t offset, int whence, loff_t size)
+{
+ switch (whence) {
+ case SEEK_SET: case SEEK_CUR:
+ return generic_file_llseek_size(file, offset, whence,
+ size, 0);
+ default:
+ return -EINVAL;
+ }
+}
+EXPORT_SYMBOL(no_seek_end_llseek_size);
+
+/**
* noop_llseek - No Operation Performed llseek implementation
* @file: file structure to seek on
* @offset: file offset to seek to