ocfs2: Add extended attribute support

This patch implements storing extended attributes both in inode or a single
external block. We only store EA's in-inode when blocksize > 512 or that
inode block has free space for it. When an EA's value is larger than 80
bytes, we will store the value via b-tree outside inode or block.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index 390a85596aa0..499bc62e758b 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -40,6 +40,9 @@ struct ocfs2_inode_info
         /* protects allocation changes on this inode. */
         struct rw_semaphore             ip_alloc_sem;
 
+        /* protects extended attribute changes on this inode */
+        struct rw_semaphore             ip_xattr_sem;
+
         /* These fields are protected by ip_lock */
         spinlock_t                      ip_lock;
         u32                             ip_open_count;