Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[cascardo/linux.git] / include / linux / kernfs.h

diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index 30faf79..d4e01b3 100644 (file)
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -179,6 +179,7 @@ struct kernfs_open_file {
        struct mutex            mutex;
        int                     event;
        struct list_head        list;
+       char                    *prealloc_buf;
 
        size_t                  atomic_write_len;
        bool                    mmapped;
@@ -214,6 +215,13 @@ struct kernfs_ops {
         * larger ones are rejected with -E2BIG.
         */
        size_t atomic_write_len;
+       /*
+        * "prealloc" causes a buffer to be allocated at open for
+        * all read/write requests.  As ->seq_show uses seq_read()
+        * which does its own allocation, it is incompatible with
+        * ->prealloc.  Provide ->read and ->write with ->prealloc.
+        */
+       bool prealloc;
        ssize_t (*write)(struct kernfs_open_file *of, char *buf, size_t bytes,
                         loff_t off);