nfs: Add ALLOCATE support
This patch adds support for using the NFS v4.2 operation ALLOCATE to
preallocate data in a file.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index c51fb4d..f78e9fd 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -3,6 +3,8 @@
*
* Copyright (C) 1992 Rick Sladkey
*/
+#include <linux/fs.h>
+#include <linux/falloc.h>
#include <linux/nfs_fs.h>
#include "internal.h"
#include "fscache.h"
@@ -134,6 +136,29 @@
return nfs_file_llseek(filep, offset, whence);
}
}
+
+static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
+{
+ struct inode *inode = file_inode(filep);
+ long ret;
+
+ if (!S_ISREG(inode->i_mode))
+ return -EOPNOTSUPP;
+
+ if (mode != 0)
+ return -EOPNOTSUPP;
+
+ ret = inode_newsize_ok(inode, offset + len);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&inode->i_mutex);
+ ret = nfs42_proc_allocate(filep, offset, len);
+ mutex_unlock(&inode->i_mutex);
+
+ nfs_zap_caches(inode);
+ return ret;
+}
#endif /* CONFIG_NFS_V4_2 */
const struct file_operations nfs4_file_operations = {
@@ -155,6 +180,9 @@
.flock = nfs_flock,
.splice_read = nfs_file_splice_read,
.splice_write = iter_file_splice_write,
+#ifdef CONFIG_NFS_V4_2
+ .fallocate = nfs42_fallocate,
+#endif /* CONFIG_NFS_V4_2 */
.check_flags = nfs_check_flags,
.setlease = simple_nosetlease,
};