ocfs2: Define refcount tree structure.
Signed-off-by: Tao Ma <tao.ma@oracle.com>
This commit is contained in:
Tao Ma
Joel Becker
parent
5e404e9ed1
commit
721f69c404
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@ -68,6 +68,7 @@
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#define OCFS2_DIR_TRAILER_SIGNATURE "DIRTRL1"
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#define OCFS2_DX_ROOT_SIGNATURE "DXDIR01"
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#define OCFS2_DX_LEAF_SIGNATURE "DXLEAF1"
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#define OCFS2_REFCOUNT_BLOCK_SIGNATURE "REFCNT1"
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/* Compatibility flags */
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#define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \
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@ -160,6 +161,9 @@
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/* Metadata checksum and error correction */
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#define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800
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/* Refcount tree support */
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#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000
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/*
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* backup superblock flag is used to indicate that this volume
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* has backup superblocks.
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@ -223,6 +227,7 @@
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#define OCFS2_HAS_XATTR_FL (0x0002)
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#define OCFS2_INLINE_XATTR_FL (0x0004)
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#define OCFS2_INDEXED_DIR_FL (0x0008)
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#define OCFS2_HAS_REFCOUNT_FL (0x0010)
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/* Inode attributes, keep in sync with EXT2 */
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#define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */
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@ -241,8 +246,11 @@
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/*
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* Extent record flags (e_node.leaf.flags)
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*/
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#define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
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* unwritten */
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#define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
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* unwritten */
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#define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference
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* counted in an associated
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* refcount tree */
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/*
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* ioctl commands
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@ -717,7 +725,8 @@ struct ocfs2_dinode {
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__le64 i_xattr_loc;
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/*80*/ struct ocfs2_block_check i_check; /* Error checking */
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/*88*/ __le64 i_dx_root; /* Pointer to dir index root block */
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__le64 i_reserved2[5];
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/*90*/ __le64 i_refcount_loc;
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__le64 i_reserved2[4];
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/*B8*/ union {
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__le64 i_pad1; /* Generic way to refer to this
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64bit union */
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@ -901,6 +910,59 @@ struct ocfs2_group_desc
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/*40*/ __u8 bg_bitmap[0];
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};
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struct ocfs2_refcount_rec {
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/*00*/ __le64 r_cpos; /* Physical offset, in clusters */
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__le32 r_clusters; /* Clusters covered by this extent */
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__le32 r_refcount; /* Reference count of this extent */
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/*10*/
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};
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#define OCFS2_REFCOUNT_LEAF_FL (0x00000001)
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#define OCFS2_REFCOUNT_TREE_FL (0x00000002)
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struct ocfs2_refcount_list {
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/*00*/ __le16 rl_count; /* Maximum number of entries possible
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in rl_records */
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__le16 rl_used; /* Current number of used records */
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__le32 rl_reserved2;
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__le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */
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/*10*/ struct ocfs2_refcount_rec rl_recs[0]; /* Refcount records */
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};
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struct ocfs2_refcount_block {
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/*00*/ __u8 rf_signature[8]; /* Signature for verification */
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__le16 rf_suballoc_slot; /* Slot suballocator this block
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belongs to */
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__le16 rf_suballoc_bit; /* Bit offset in suballocator
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block group */
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__le32 rf_fs_generation; /* Must match superblock */
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/*10*/ __le64 rf_blkno; /* Offset on disk, in blocks */
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__le64 rf_parent; /* Parent block, only valid if
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OCFS2_REFCOUNT_LEAF_FL is set in
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rf_flags */
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/*20*/ struct ocfs2_block_check rf_check; /* Error checking */
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__le64 rf_last_eb_blk; /* Pointer to last extent block */
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/*30*/ __le32 rf_count; /* Number of inodes sharing this
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refcount tree */
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__le32 rf_flags; /* See the flags above */
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__le32 rf_clusters; /* clusters covered by refcount tree. */
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__le32 rf_cpos; /* cluster offset in refcount tree.*/
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/*40*/ __le32 rf_generation; /* generation number. all be the same
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* for the same refcount tree. */
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__le32 rf_reserved0;
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__le64 rf_reserved1[7];
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/*80*/ union {
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struct ocfs2_refcount_list rf_records; /* List of refcount
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records */
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struct ocfs2_extent_list rf_list; /* Extent record list,
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only valid if
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OCFS2_REFCOUNT_TREE_FL
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is set in rf_flags */
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};
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/* Actual on-disk size is one block */
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};
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/*
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* On disk extended attribute structure for OCFS2.
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*/
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@ -1312,6 +1374,26 @@ static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
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return size / sizeof(struct ocfs2_extent_rec);
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}
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static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb)
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{
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int size;
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size = sb->s_blocksize -
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offsetof(struct ocfs2_refcount_block, rf_list.l_recs);
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return size / sizeof(struct ocfs2_extent_rec);
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}
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static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb)
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{
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int size;
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size = sb->s_blocksize -
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offsetof(struct ocfs2_refcount_block, rf_records.rl_recs);
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return size / sizeof(struct ocfs2_refcount_rec);
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}
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#else
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static inline int ocfs2_fast_symlink_chars(int blocksize)
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{
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