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-rw-r--r--fs/exportfs/expfs.c57
1 files changed, 20 insertions, 37 deletions
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index c20704aa21..3ae0154c56 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -342,43 +342,30 @@ out:
return error;
}
+#define FILEID_INO64_GEN_LEN 3
+
/**
- * export_encode_fh - default export_operations->encode_fh function
+ * exportfs_encode_ino64_fid - encode non-decodeable 64bit ino file id
* @inode: the object to encode
* @fid: where to store the file handle fragment
- * @max_len: maximum length to store there
- * @parent: parent directory inode, if wanted
+ * @max_len: maximum length to store there (in 4 byte units)
*
- * This default 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.
+ * This generic function is used to encode a non-decodeable file id for
+ * fanotify for filesystems that do not support NFS export.
*/
-static int export_encode_fh(struct inode *inode, struct fid *fid,
- int *max_len, struct inode *parent)
+static int exportfs_encode_ino64_fid(struct inode *inode, struct fid *fid,
+ int *max_len)
{
- 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;
+ if (*max_len < FILEID_INO64_GEN_LEN) {
+ *max_len = FILEID_INO64_GEN_LEN;
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;
+ fid->i64.ino = inode->i_ino;
+ fid->i64.gen = inode->i_generation;
+ *max_len = FILEID_INO64_GEN_LEN;
+
+ return FILEID_INO64_GEN;
}
/**
@@ -396,17 +383,13 @@ int exportfs_encode_inode_fh(struct inode *inode, struct fid *fid,
{
const struct export_operations *nop = inode->i_sb->s_export_op;
- /*
- * If a decodeable file handle was requested, we need to make sure that
- * filesystem can decode file handles.
- */
- if (nop && !(flags & EXPORT_FH_FID) && !nop->fh_to_dentry)
+ if (!exportfs_can_encode_fh(nop, flags))
return -EOPNOTSUPP;
- if (nop && nop->encode_fh)
- return nop->encode_fh(inode, fid->raw, max_len, parent);
+ if (!nop && (flags & EXPORT_FH_FID))
+ return exportfs_encode_ino64_fid(inode, fid, max_len);
- return export_encode_fh(inode, fid, max_len, parent);
+ return nop->encode_fh(inode, fid->raw, max_len, parent);
}
EXPORT_SYMBOL_GPL(exportfs_encode_inode_fh);
@@ -456,7 +439,7 @@ exportfs_decode_fh_raw(struct vfsmount *mnt, struct fid *fid, int fh_len,
/*
* Try to get any dentry for the given file handle from the filesystem.
*/
- if (!nop || !nop->fh_to_dentry)
+ if (!exportfs_can_decode_fh(nop))
return ERR_PTR(-ESTALE);
result = nop->fh_to_dentry(mnt->mnt_sb, fid, fh_len, fileid_type);
if (IS_ERR_OR_NULL(result))