LU-12056 ldiskfs: add trusted.projid virtual xattr

[fs/lustre-release.git] / lustre / llite / xattr_cache.c

diff --git a/lustre/llite/xattr_cache.c b/lustre/llite/xattr_cache.c
index a42329d..ce3e3a7 100644 (file)
--- a/lustre/llite/xattr_cache.c
+++ b/lustre/llite/xattr_cache.c
@@ -610,6 +610,21 @@ int ll_xattr_cache_get(struct inode *inode,
                                else
                                        rc = -ERANGE;
                        }
+               /* Return the project id when the virtual project id xattr
+                * is explicitly asked.
+                */
+               } else if (strcmp(name, XATTR_NAME_PROJID) == 0) {
+                       /* 10 chars to hold u32 in decimal, plus ending \0 */
+                       char projid[11];
+
+                       rc = snprintf(projid, sizeof(projid),
+                                     "%u", lli->lli_projid);
+                       if (size != 0) {
+                               if (rc <= size)
+                                       memcpy(buffer, projid, rc);
+                               else
+                                       rc = -ERANGE;
+                       }
                }
        } else if (valid & OBD_MD_FLXATTRLS) {
                rc = ll_xattr_cache_list(&lli->lli_xattrs,