ocfs2: reserve inline space for extended attribute

Add the structures and helper functions we want for handling inline extended
attributes. We also update the inline-data handlers so that they properly
function in the event that we have both inline data and inline attributes
sharing an inode block.

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

4 files changed, 62 insertions, 9 deletions

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index e45421fee204..ace27d1ca574 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -6577,20 +6577,29 @@ out:
         return ret;
 }
 
-static void ocfs2_zero_dinode_id2(struct inode *inode, struct ocfs2_dinode *di)
+static void ocfs2_zero_dinode_id2_with_xattr(struct inode *inode,
+                                             struct ocfs2_dinode *di)
 {
         unsigned int blocksize = 1 << inode->i_sb->s_blocksize_bits;
+        unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
 
-        memset(&di->id2, 0, blocksize - offsetof(struct ocfs2_dinode, id2));
+        if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
+                memset(&di->id2, 0, blocksize -
+                                    offsetof(struct ocfs2_dinode, id2) -
+                                    xattrsize);
+        else
+                memset(&di->id2, 0, blocksize -
+                                    offsetof(struct ocfs2_dinode, id2));
 }
 
 void ocfs2_dinode_new_extent_list(struct inode *inode,
                                   struct ocfs2_dinode *di)
 {
-        ocfs2_zero_dinode_id2(inode, di);
+        ocfs2_zero_dinode_id2_with_xattr(inode, di);
         di->id2.i_list.l_tree_depth = 0;
         di->id2.i_list.l_next_free_rec = 0;
-        di->id2.i_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(inode->i_sb));
+        di->id2.i_list.l_count = cpu_to_le16(
+                ocfs2_extent_recs_per_inode_with_xattr(inode->i_sb, di));
 }
 
 void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di)
@@ -6607,9 +6616,10 @@ void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di)
          * We clear the entire i_data structure here so that all
          * fields can be properly initialized.
          */
-        ocfs2_zero_dinode_id2(inode, di);
+        ocfs2_zero_dinode_id2_with_xattr(inode, di);
 
-        idata->id_count = cpu_to_le16(ocfs2_max_inline_data(inode->i_sb));
+        idata->id_count = cpu_to_le16(
+                        ocfs2_max_inline_data_with_xattr(inode->i_sb, di));
 }
 
 int ocfs2_convert_inline_data_to_extents(struct inode *inode,
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 128279986d65..ce75ca312a2d 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -245,6 +245,7 @@ struct ocfs2_super
         int s_sectsize_bits;
         int s_clustersize;
         int s_clustersize_bits;
+        unsigned int s_xattr_inline_size;
 
         atomic_t vol_state;
         struct mutex recovery_lock;
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index 1b46505e1e36..1055ba0af9bb 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -300,6 +300,12 @@ struct ocfs2_new_group_input {
  */
 #define OCFS2_DEFAULT_LOCAL_ALLOC_SIZE  8
 
+/*
+ * Inline extended attribute size (in bytes)
+ * The value chosen should be aligned to 16 byte boundaries.
+ */
+#define OCFS2_MIN_XATTR_INLINE_SIZE     256
+
 struct ocfs2_system_inode_info {
         char    *si_name;
         int     si_iflags;
@@ -622,7 +628,8 @@ struct ocfs2_dinode {
                                            belongs to */
         __le16 i_suballoc_bit;          /* Bit offset in suballocator
                                            block group */
-/*10*/  __le32 i_reserved0;
+/*10*/  __le16 i_reserved0;
+        __le16 i_xattr_inline_size;
         __le32 i_clusters;              /* Cluster count */
         __le32 i_uid;                   /* Owner UID */
         __le32 i_gid;                   /* Owning GID */
@@ -641,11 +648,12 @@ struct ocfs2_dinode {
         __le32 i_atime_nsec;
         __le32 i_ctime_nsec;
         __le32 i_mtime_nsec;
-        __le32 i_attr;
+/*70*/  __le32 i_attr;
         __le16 i_orphaned_slot;         /* Only valid when OCFS2_ORPHANED_FL
                                            was set in i_flags */
         __le16 i_dyn_features;
-/*70*/  __le64 i_reserved2[8];
+        __le64 i_xattr_loc;
+/*80*/  __le64 i_reserved2[7];
 /*B8*/  union {
                 __le64 i_pad1;          /* Generic way to refer to this
                                            64bit union */
@@ -846,6 +854,20 @@ static inline int ocfs2_max_inline_data(struct super_block *sb)
                 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
 }
 
+static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb,
+                                                   struct ocfs2_dinode *di)
+{
+        unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
+
+        if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
+                return sb->s_blocksize -
+                        offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
+                        xattrsize;
+        else
+                return sb->s_blocksize -
+                        offsetof(struct ocfs2_dinode, id2.i_data.id_data);
+}
+
 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
 {
         int size;
@@ -856,6 +878,24 @@ static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
         return size / sizeof(struct ocfs2_extent_rec);
 }
 
+static inline int ocfs2_extent_recs_per_inode_with_xattr(
+                                                struct super_block *sb,
+                                                struct ocfs2_dinode *di)
+{
+        int size;
+        unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
+
+        if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
+                size = sb->s_blocksize -
+                        offsetof(struct ocfs2_dinode, id2.i_list.l_recs) -
+                        xattrsize;
+        else
+                size = sb->s_blocksize -
+                        offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
+
+        return size / sizeof(struct ocfs2_extent_rec);
+}
+
 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
 {
         int size;
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index a2d3dcf70252..9bdb3aeefe89 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1424,6 +1424,8 @@ static int ocfs2_initialize_super(struct super_block *sb,
 
         osb->slot_num = OCFS2_INVALID_SLOT;
 
+        osb->s_xattr_inline_size = OCFS2_MIN_XATTR_INLINE_SIZE;
+
         osb->local_alloc_state = OCFS2_LA_UNUSED;
         osb->local_alloc_bh = NULL;
         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);