3 files changed, 37 insertions, 12 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index acb7ef80ea4f..a49d9dd06d1d 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -561,9 +561,19 @@ static int proc_setattr(struct dentry *dentry, struct iattr *attr)
                 return -EPERM;
 
         error = inode_change_ok(inode, attr);
-        if (!error)
-                error = inode_setattr(inode, attr);
-        return error;
+        if (error)
+                return error;
+
+        if ((attr->ia_valid & ATTR_SIZE) &&
+            attr->ia_size != i_size_read(inode)) {
+                error = vmtruncate(inode, attr->ia_size);
+                if (error)
+                        return error;
+        }
+
+        setattr_copy(inode, attr);
+        mark_inode_dirty(inode);
+        return 0;
 }
 
 static const struct inode_operations proc_def_inode_operations = {
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 2791907744ed..dd29f0337661 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -12,6 +12,7 @@
 #include <linux/time.h>
 #include <linux/proc_fs.h>
 #include <linux/stat.h>
+#include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/mount.h>
@@ -258,17 +259,22 @@ static int proc_notify_change(struct dentry *dentry, struct iattr *iattr)
 
         error = inode_change_ok(inode, iattr);
         if (error)
-                goto out;
+                return error;
 
-        error = inode_setattr(inode, iattr);
-        if (error)
-                goto out;
+        if ((iattr->ia_valid & ATTR_SIZE) &&
+            iattr->ia_size != i_size_read(inode)) {
+                error = vmtruncate(inode, iattr->ia_size);
+                if (error)
+                        return error;
+        }
+
+        setattr_copy(inode, iattr);
+        mark_inode_dirty(inode);
         
         de->uid = inode->i_uid;
         de->gid = inode->i_gid;
         de->mode = inode->i_mode;
-out:
-        return error;
+        return 0;
 }
 
 static int proc_getattr(struct vfsmount *mnt, struct dentry *dentry,
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 6ff9981f0a18..5be436ea088e 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -329,10 +329,19 @@ static int proc_sys_setattr(struct dentry *dentry, struct iattr *attr)
                 return -EPERM;
 
         error = inode_change_ok(inode, attr);
-        if (!error)
-                error = inode_setattr(inode, attr);
+        if (error)
+                return error;
+
+        if ((attr->ia_valid & ATTR_SIZE) &&
+            attr->ia_size != i_size_read(inode)) {
+                error = vmtruncate(inode, attr->ia_size);
+                if (error)
+                        return error;
+        }
 
-        return error;
+        setattr_copy(inode, attr);
+        mark_inode_dirty(inode);
+        return 0;
 }
 
 static int proc_sys_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)