[PATCH] Add vector AIO support

This work is initially done by Zach Brown to add support for vectored aio.
These are the core changes for AIO to support
IOCB_CMD_PREADV/IOCB_CMD_PWRITEV.

[akpm@osdl.org: huge build fix]
Signed-off-by: Zach Brown <zach.brown@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Acked-by: Benjamin LaHaise <bcrl@kvack.org>
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/aio.h b/include/linux/aio.h
index 58349e58b749..5722568fc71e 100644
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -7,6 +7,7 @@
 #include <linux/uio.h>
 
 #include <asm/atomic.h>
+#include <linux/uio.h>
 
 #define AIO_MAXSEGS             4
 #define AIO_KIOGRP_NR_ATOMIC    8
@@ -114,6 +115,9 @@ struct kiocb {
         long                    ki_kicked;      /* just for testing */
         long                    ki_queued;      /* just for testing */
         struct iovec            ki_inline_vec;  /* inline vector */
+        struct iovec            *ki_iovec;
+        unsigned long           ki_nr_segs;
+        unsigned long           ki_cur_seg;
 
         struct list_head        ki_list;        /* the aio core uses this
                                                  * for cancellation */
diff --git a/include/linux/aio_abi.h b/include/linux/aio_abi.h
index 30fdcc89d142..3466b1d0ffd2 100644
--- a/include/linux/aio_abi.h
+++ b/include/linux/aio_abi.h
@@ -41,6 +41,8 @@ enum {
          * IOCB_CMD_POLL = 5,
          */
         IOCB_CMD_NOOP = 6,
+        IOCB_CMD_PREADV = 7,
+        IOCB_CMD_PWRITEV = 8,
 };
 
 /* read() from /dev/aio returns these structures. */
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 011129f8803e..4bb70871873f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1150,6 +1150,11 @@ struct inode_operations {
 
 struct seq_file;
 
+ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
+                                unsigned long nr_segs, unsigned long fast_segs,
+                                struct iovec *fast_pointer,
+                                struct iovec **ret_pointer);
+
 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,