[PATCH v2] sysdeps: linux: Add BTRFS_SUPER_MAGIC to pathconf

[Ronan Pigott]

btrfs has a 65535 maximum link count. Include this value in pathconf to
give the real max link count for this filesystem.

changes in v2:
 - Keep the list of max link counts sorted
---
 sysdeps/unix/sysv/linux/linux_fsinfo.h | 1 +
 sysdeps/unix/sysv/linux/pathconf.c     | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/sysdeps/unix/sysv/linux/linux_fsinfo.h b/sysdeps/unix/sysv/linux/linux_fsinfo.h
index 6625e544bf46..975894277fb4 100644
--- a/sysdeps/unix/sysv/linux/linux_fsinfo.h
+++ b/sysdeps/unix/sysv/linux/linux_fsinfo.h
@@ -251,6 +251,7 @@
 #define XFS_SUPER_MAGIC		0x58465342
 
 /* Maximum link counts.  */
+#define BTRFS_LINK_MAX		65535
 #define COH_LINK_MAX		10000
 #define EXT2_LINK_MAX		32000
 #define EXT4_LINK_MAX		65000
diff --git a/sysdeps/unix/sysv/linux/pathconf.c b/sysdeps/unix/sysv/linux/pathconf.c
index 5ee17682e23e..87a0a3a76827 100644
--- a/sysdeps/unix/sysv/linux/pathconf.c
+++ b/sysdeps/unix/sysv/linux/pathconf.c
@@ -186,6 +186,9 @@ __statfs_link_max (int result, const struct statfs *fsbuf, const char *file,
     case LUSTRE_SUPER_MAGIC:
       return LUSTRE_LINK_MAX;
 
+    case BTRFS_SUPER_MAGIC:
+      return BTRFS_LINK_MAX;
+
     default:
       return LINUX_LINK_MAX;
     }
-- 
2.48.1