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authorAmir Goldstein <amir73il@gmail.com>2023-10-26 23:45:40 +0300
committerChristian Brauner <brauner@kernel.org>2023-10-28 17:16:19 +0300
commitd9e5d9221d7f82a2736f091bbc5b54ab8d6ef701 (patch)
tree1c56890185ebd228e662a3bf92235c1e012840f7 /fs/libfs.c
parentceb33880431c8284b58de5602b15dfb7ac0a4aa5 (diff)
downloadlinux-d9e5d9221d7f82a2736f091bbc5b54ab8d6ef701.tar.xz
fs: fix build error with CONFIG_EXPORTFS=m or not defined
Many of the filesystems that call the generic exportfs helpers do not select the EXPORTFS config. Move generic_encode_ino32_fh() to libfs.c, same as generic_fh_to_*() to avoid having to fix all those config dependencies. Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202310262151.renqMvme-lkp@intel.com/ Fixes: dfaf653dc415 ("exportfs: make ->encode_fh() a mandatory method for NFS export") Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Link: https://lore.kernel.org/r/20231026204540.143217-1-amir73il@gmail.com Tested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/libfs.c')
-rw-r--r--fs/libfs.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/fs/libfs.c b/fs/libfs.c
index 8117b24b929d..38950cce135b 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1311,6 +1311,47 @@ ssize_t simple_attr_write_signed(struct file *file, const char __user *buf,
EXPORT_SYMBOL_GPL(simple_attr_write_signed);
/**
+ * generic_encode_ino32_fh - generic export_operations->encode_fh function
+ * @inode: the object to encode
+ * @fh: where to store the file handle fragment
+ * @max_len: maximum length to store there (in 4 byte units)
+ * @parent: parent directory inode, if wanted
+ *
+ * This generic encode_fh function assumes that the 32 inode number
+ * is suitable for locating an inode, and that the generation number
+ * can be used to check that it is still valid. It places them in the
+ * filehandle fragment where export_decode_fh expects to find them.
+ */
+int generic_encode_ino32_fh(struct inode *inode, __u32 *fh, int *max_len,
+ struct inode *parent)
+{
+ struct fid *fid = (void *)fh;
+ int len = *max_len;
+ int type = FILEID_INO32_GEN;
+
+ if (parent && (len < 4)) {
+ *max_len = 4;
+ return FILEID_INVALID;
+ } else if (len < 2) {
+ *max_len = 2;
+ return FILEID_INVALID;
+ }
+
+ len = 2;
+ fid->i32.ino = inode->i_ino;
+ fid->i32.gen = inode->i_generation;
+ if (parent) {
+ fid->i32.parent_ino = parent->i_ino;
+ fid->i32.parent_gen = parent->i_generation;
+ len = 4;
+ type = FILEID_INO32_GEN_PARENT;
+ }
+ *max_len = len;
+ return type;
+}
+EXPORT_SYMBOL_GPL(generic_encode_ino32_fh);
+
+/**
* generic_fh_to_dentry - generic helper for the fh_to_dentry export operation
* @sb: filesystem to do the file handle conversion on
* @fid: file handle to convert