[XFS] Dynamically allocate local kiocb structures in readv/writev routines

to reduce stack footprint.

SGI-PV: 947312
SGI-Modid: xfs-linux-melb:xfs-kern:25358a

Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 22 insertions, 12 deletions

diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c
index ced4404339c7..269995ddfbdf 100644
--- a/fs/xfs/linux-2.6/xfs_file.c
+++ b/fs/xfs/linux-2.6/xfs_file.c
@@ -145,17 +145,22 @@ __linvfs_readv(
 {
         struct inode    *inode = file->f_mapping->host;
         vnode_t         *vp = LINVFS_GET_VP(inode);
-        struct          kiocb kiocb;
+        struct kiocb    *kiocb;
         ssize_t         rval;
 
-        init_sync_kiocb(&kiocb, file);
-        kiocb.ki_pos = *ppos;
+        kiocb = kmalloc(sizeof(*kiocb), GFP_KERNEL);
+        if (unlikely(!kiocb))
+                return -ENOMEM;
+
+        init_sync_kiocb(kiocb, file);
+        kiocb->ki_pos = *ppos;
 
         if (unlikely(file->f_flags & O_DIRECT))
                 ioflags |= IO_ISDIRECT;
-        VOP_READ(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval);
+        VOP_READ(vp, kiocb, iov, nr_segs, &kiocb->ki_pos, ioflags, NULL, rval);
 
-        *ppos = kiocb.ki_pos;
+        *ppos = kiocb->ki_pos;
+        kfree(kiocb);
         return rval;
 }
 
@@ -190,17 +195,22 @@ __linvfs_writev(
 {
         struct inode    *inode = file->f_mapping->host;
         vnode_t         *vp = LINVFS_GET_VP(inode);
-        struct          kiocb kiocb;
+        struct kiocb    *kiocb;
         ssize_t         rval;
 
-        init_sync_kiocb(&kiocb, file);
-        kiocb.ki_pos = *ppos;
+        kiocb = kmalloc(sizeof(*kiocb), GFP_KERNEL);
+        if (unlikely(!kiocb))
+                return -ENOMEM;
+
+        init_sync_kiocb(kiocb, file);
+        kiocb->ki_pos = *ppos;
         if (unlikely(file->f_flags & O_DIRECT))
                 ioflags |= IO_ISDIRECT;
 
-        VOP_WRITE(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval);
+        VOP_WRITE(vp, kiocb, iov, nr_segs, &kiocb->ki_pos, ioflags, NULL, rval);
 
-        *ppos = kiocb.ki_pos;
+        *ppos = kiocb->ki_pos;
+        kfree(kiocb);
         return rval;
 }
 
@@ -435,7 +445,7 @@ linvfs_ioctl(
         unsigned long   arg)
 {
         int             error;
-        struct inode *inode = filp->f_dentry->d_inode;
+        struct inode    *inode = filp->f_dentry->d_inode;
         vnode_t         *vp = LINVFS_GET_VP(inode);
 
         VOP_IOCTL(vp, inode, filp, 0, cmd, (void __user *)arg, error);
@@ -457,7 +467,7 @@ linvfs_ioctl_invis(
         unsigned long   arg)
 {
         int             error;
-        struct inode *inode = filp->f_dentry->d_inode;
+        struct inode    *inode = filp->f_dentry->d_inode;
         vnode_t         *vp = LINVFS_GET_VP(inode);
 
         ASSERT(vp);