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>

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index e45421f..ace27d1 100644 (file)
--- 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 1282799..ce75ca3 100644 (file)
--- 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 1b46505..1055ba0 100644 (file)
--- 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 a2d3dcf..9bdb3ae 100644 (file)
--- 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);