vfs: export lseek_execute() to modules

[linux-imx.git] / fs / read_write.c

diff --git a/fs/read_write.c b/fs/read_write.c
index 37d16e82b575b9dc9a200f4bbfcb6e89b9e2eabc..122a3846d9e14270a26952e92b25971257ebd82b 100644 (file)
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -41,7 +41,19 @@ static inline int unsigned_offsets(struct file *file)
        return file->f_mode & FMODE_UNSIGNED_OFFSET;
 }
 
-static loff_t lseek_execute(struct file *file, loff_t offset, loff_t maxsize)
+/**
+ * vfs_setpos - update the file offset for lseek
+ * @file:      file structure in question
+ * @offset:    file offset to seek to
+ * @maxsize:   maximum file size
+ *
+ * This is a low-level filesystem helper for updating the file offset to
+ * the value specified by @offset if the given offset is valid and it is
+ * not equal to the current file offset.
+ *
+ * Return the specified offset on success and -EINVAL on invalid offset.
+ */
+loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize)
 {
        if (offset < 0 && !unsigned_offsets(file))
                return -EINVAL;
@@ -54,6 +66,7 @@ static loff_t lseek_execute(struct file *file, loff_t offset, loff_t maxsize)
        }
        return offset;
 }
+EXPORT_SYMBOL(vfs_setpos);
 
 /**
  * generic_file_llseek_size - generic llseek implementation for regular files
@@ -94,7 +107,7 @@ generic_file_llseek_size(struct file *file, loff_t offset, int whence,
                 * like SEEK_SET.
                 */
                spin_lock(&file->f_lock);
-               offset = lseek_execute(file, file->f_pos + offset, maxsize);
+               offset = vfs_setpos(file, file->f_pos + offset, maxsize);
                spin_unlock(&file->f_lock);
                return offset;
        case SEEK_DATA:
@@ -116,7 +129,7 @@ generic_file_llseek_size(struct file *file, loff_t offset, int whence,
                break;
        }
 
-       return lseek_execute(file, offset, maxsize);
+       return vfs_setpos(file, offset, maxsize);
 }
 EXPORT_SYMBOL(generic_file_llseek_size);