xattr: break delegations in {set,remove}xattr

commit 08b5d5014a27e717826999ad20e394a8811aae92 upstream.

set/removexattr on an exported filesystem should break NFS delegations.
This is true in general, but also for the upcoming support for
RFC 8726 (NFSv4 extended attribute support). Make sure that they do.

Additionally, they need to grow a _locked variant, since callers might
call this with i_rwsem held (like the NFS server code).

Cc: stable@vger.kernel.org # v4.9+
Cc: linux-fsdevel@vger.kernel.org
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Frank van der Linden <fllinden@amazon.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/xattr.c b/fs/xattr.c
index 90dd78f0eb279d4729d7f36e0bab3d2816bd002c..f2854570d411995fbbd2ac0449865b696e18bb73 100644 (file)
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -204,10 +204,22 @@ int __vfs_setxattr_noperm(struct dentry *dentry, const char *name,
        return error;
 }
 
-
+/**
+ * __vfs_setxattr_locked: set an extended attribute while holding the inode
+ * lock
+ *
+ *  @dentry - object to perform setxattr on
+ *  @name - xattr name to set
+ *  @value - value to set @name to
+ *  @size - size of @value
+ *  @flags - flags to pass into filesystem operations
+ *  @delegated_inode - on return, will contain an inode pointer that
+ *  a delegation was broken on, NULL if none.
+ */
 int
-vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
-               size_t size, int flags)
+__vfs_setxattr_locked(struct dentry *dentry, const char *name,
+               const void *value, size_t size, int flags,
+               struct inode **delegated_inode)
 {
        struct inode *inode = dentry->d_inode;
        int error;
@@ -216,15 +228,40 @@ vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
        if (error)
                return error;
 
-       inode_lock(inode);
        error = security_inode_setxattr(dentry, name, value, size, flags);
        if (error)
                goto out;
 
+       error = try_break_deleg(inode, delegated_inode);
+       if (error)
+               goto out;
+
        error = __vfs_setxattr_noperm(dentry, name, value, size, flags);
 
 out:
+       return error;
+}
+EXPORT_SYMBOL_GPL(__vfs_setxattr_locked);
+
+int
+vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
+               size_t size, int flags)
+{
+       struct inode *inode = dentry->d_inode;
+       struct inode *delegated_inode = NULL;
+       int error;
+
+retry_deleg:
+       inode_lock(inode);
+       error = __vfs_setxattr_locked(dentry, name, value, size, flags,
+           &delegated_inode);
        inode_unlock(inode);
+
+       if (delegated_inode) {
+               error = break_deleg_wait(&delegated_inode);
+               if (!error)
+                       goto retry_deleg;
+       }
        return error;
 }
 EXPORT_SYMBOL_GPL(vfs_setxattr);
@@ -378,8 +415,18 @@ __vfs_removexattr(struct dentry *dentry, const char *name)
 }
 EXPORT_SYMBOL(__vfs_removexattr);
 
+/**
+ * __vfs_removexattr_locked: set an extended attribute while holding the inode
+ * lock
+ *
+ *  @dentry - object to perform setxattr on
+ *  @name - name of xattr to remove
+ *  @delegated_inode - on return, will contain an inode pointer that
+ *  a delegation was broken on, NULL if none.
+ */
 int
-vfs_removexattr(struct dentry *dentry, const char *name)
+__vfs_removexattr_locked(struct dentry *dentry, const char *name,
+               struct inode **delegated_inode)
 {
        struct inode *inode = dentry->d_inode;
        int error;
@@ -388,11 +435,14 @@ vfs_removexattr(struct dentry *dentry, const char *name)
        if (error)
                return error;
 
-       inode_lock(inode);
        error = security_inode_removexattr(dentry, name);
        if (error)
                goto out;
 
+       error = try_break_deleg(inode, delegated_inode);
+       if (error)
+               goto out;
+
        error = __vfs_removexattr(dentry, name);
 
        if (!error) {
@@ -401,12 +451,32 @@ vfs_removexattr(struct dentry *dentry, const char *name)
        }
 
 out:
+       return error;
+}
+EXPORT_SYMBOL_GPL(__vfs_removexattr_locked);
+
+int
+vfs_removexattr(struct dentry *dentry, const char *name)
+{
+       struct inode *inode = dentry->d_inode;
+       struct inode *delegated_inode = NULL;
+       int error;
+
+retry_deleg:
+       inode_lock(inode);
+       error = __vfs_removexattr_locked(dentry, name, &delegated_inode);
        inode_unlock(inode);
+
+       if (delegated_inode) {
+               error = break_deleg_wait(&delegated_inode);
+               if (!error)
+                       goto retry_deleg;
+       }
+
        return error;
 }
 EXPORT_SYMBOL_GPL(vfs_removexattr);
 
-
 /*
  * Extended attribute SET operations
  */

diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 6dad031be3c2db93dc4ec88bd74193c09ce96d58..3a71ad716da58ea1ca23e804817e8b8739a01500 100644 (file)
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -51,8 +51,10 @@ ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
 ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
 int __vfs_setxattr(struct dentry *, struct inode *, const char *, const void *, size_t, int);
 int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
+int __vfs_setxattr_locked(struct dentry *, const char *, const void *, size_t, int, struct inode **);
 int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
 int __vfs_removexattr(struct dentry *, const char *);
+int __vfs_removexattr_locked(struct dentry *, const char *, struct inode **);
 int vfs_removexattr(struct dentry *, const char *);
 
 ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);