NFS: Reduce time spent holding the i_mutex during fallocate()

[firefly-linux-kernel-4.4.55.git] / fs / nfs / nfs42proc.c

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index b9aa6bbcc8ed57c77ce5c784d7c156ab12268eb3..3a9e75235f30e60e5a4ae974864c63fb003b969d 100644 (file)
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -96,9 +96,13 @@ int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
        if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
                return -EOPNOTSUPP;
 
+       mutex_lock(&inode->i_mutex);
+
        err = nfs42_proc_fallocate(&msg, filep, offset, len);
        if (err == -EOPNOTSUPP)
                NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
+
+       mutex_unlock(&inode->i_mutex);
        return err;
 }
 
@@ -114,11 +118,15 @@ int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
                return -EOPNOTSUPP;
 
        nfs_wb_all(inode);
+       mutex_lock(&inode->i_mutex);
+
        err = nfs42_proc_fallocate(&msg, filep, offset, len);
        if (err == 0)
                truncate_pagecache_range(inode, offset, (offset + len) -1);
        if (err == -EOPNOTSUPP)
                NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
+
+       mutex_unlock(&inode->i_mutex);
        return err;
 }