LU-12137 osd-ldiskfs: migrate osd_ios_lookup_one_len() to osd_compat.c

The function osd_ios_lookup_one_len() was created for the LFSCK code
to look for a dentry by name and if the inode of that dentry was
NULL treat it as an -ENOENT so LFSCK would repair the file. This
function will be used for more the scrub infrastructure in future
patches so move it to osd_compat.c.

Test-Parameters: trivial

Change-Id: Ic34c1110f8ced7a4a2f7c0fa3b8a9403be9940ca
Signed-off-by: James Simmons <[email protected]>
Reviewed-on: https://review.whamcloud.com/35453
Tested-by: jenkins <[email protected]>
Tested-by: Maloo <[email protected]>
Reviewed-by: Neil Brown <[email protected]>
Reviewed-by: Alex Zhuravlev <[email protected]>
Reviewed-by: Andreas Dilger <[email protected]>

Author: James Simmons

lustre/osd-ldiskfs/osd_compat.c

@@ -66,6 +66,42 @@ static void osd_push_ctxt(const struct osd_device *dev,
 	push_ctxt(save, newctxt);
 }
 
+/**
+ * osd_ios_lookup_one_len - lookup single pathname component
+ *
+ * @name:	pathname component to lookup
+ * @base:	base directory to lookup from
+ * @len:	maximum length @len should be interpreted to
+ *
+ * Treat found dentry with NULL d_inode as an -ENOENT error so LFSCK
+ * can repair the file.
+ */
+struct dentry *osd_ios_lookup_one_len(const char *name, struct dentry *base,
+				      int len)
+{
+	struct dentry *dentry;
+
+	dentry = ll_lookup_one_len(name, base, len);
+	if (IS_ERR(dentry)) {
+		int rc = PTR_ERR(dentry);
+
+		if (rc != -ENOENT)
+			CERROR("Fail to find %.*s in %.*s (%lu/%u): rc = %d\n",
+			       len, name, base->d_name.len,
+			       base->d_name.name, base->d_inode->i_ino,
+			       base->d_inode->i_generation, rc);
+
+		return dentry;
+	}
+
+	if (dentry->d_inode == NULL) {
+		dput(dentry);
+		return ERR_PTR(-ENOENT);
+	}
+
+	return dentry;
+}
+
 /* utility to make a directory */
 static struct dentry *
 simple_mkdir(const struct lu_env *env, struct osd_device *osd,

lustre/osd-ldiskfs/osd_internal.h

@@ -793,6 +793,9 @@ int osd_oii_lookup(struct osd_device *dev, const struct lu_fid *fid,
 		   struct osd_inode_id *id);
 void osd_scrub_dump(struct seq_file *m, struct osd_device *dev);
 
+struct dentry *osd_ios_lookup_one_len(const char *name, struct dentry *base,
+				      int len);
+
 int osd_fld_lookup(const struct lu_env *env, struct osd_device *osd,
 		   u64 seq, struct lu_seq_range *range);
 

lustre/osd-ldiskfs/osd_scrub.c

@@ -1741,32 +1741,6 @@ struct osd_ios_filldir_buf {
 	int			 oifb_items;
 };
 
-static inline struct dentry *
-osd_ios_lookup_one_len(const char *name, struct dentry *parent, int namelen)
-{
-	struct dentry *dentry;
-
-	dentry = ll_lookup_one_len(name, parent, namelen);
-	if (IS_ERR(dentry)) {
-		int rc = PTR_ERR(dentry);
-
-		if (rc != -ENOENT)
-			CERROR("Fail to find %.*s in %.*s (%lu/%u): rc = %d\n",
-			       namelen, name, parent->d_name.len,
-			       parent->d_name.name, parent->d_inode->i_ino,
-			       parent->d_inode->i_generation, rc);
-
-		return dentry;
-	}
-
-	if (dentry->d_inode == NULL) {
-		dput(dentry);
-		return ERR_PTR(-ENOENT);
-	}
-
-	return dentry;
-}
-
 static int
 osd_ios_new_item(struct osd_device *dev, struct dentry *dentry,
 		 scandir_t scandir, filldir_t filldir)