#define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */
#define XFS_SB_FEAT_RO_COMPAT_RMAPBT (1 << 1) /* reverse map btree */
+#define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */
#define XFS_SB_FEAT_RO_COMPAT_ALL \
(XFS_SB_FEAT_RO_COMPAT_FINOBT | \
- XFS_SB_FEAT_RO_COMPAT_RMAPBT)
+ XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
+ XFS_SB_FEAT_RO_COMPAT_REFLINK)
#define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
static inline bool
xfs_sb_has_ro_compat_feature(
(sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT);
}
+static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
+{
+ return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
+ (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_REFLINK);
+}
+
/*
* end of superblock version macros
*/
uuid_t agf_uuid; /* uuid of filesystem */
__be32 agf_rmap_blocks; /* rmapbt blocks used */
- __be32 agf_padding; /* padding */
+ __be32 agf_refcount_blocks; /* refcountbt blocks used */
+
+ __be32 agf_refcount_root; /* refcount tree root block */
+ __be32 agf_refcount_level; /* refcount btree levels */
/*
* reserve some contiguous space for future logged fields before we add
* the unlogged fields. This makes the range logging via flags and
* structure offsets much simpler.
*/
- __be64 agf_spare64[15];
+ __be64 agf_spare64[14];
/* unlogged fields, written during buffer writeback. */
__be64 agf_lsn; /* last write sequence */
#define XFS_AGF_BTREEBLKS 0x00000800
#define XFS_AGF_UUID 0x00001000
#define XFS_AGF_RMAP_BLOCKS 0x00002000
-#define XFS_AGF_SPARE64 0x00004000
-#define XFS_AGF_NUM_BITS 15
+#define XFS_AGF_REFCOUNT_BLOCKS 0x00004000
+#define XFS_AGF_REFCOUNT_ROOT 0x00008000
+#define XFS_AGF_REFCOUNT_LEVEL 0x00010000
+#define XFS_AGF_SPARE64 0x00020000
+#define XFS_AGF_NUM_BITS 18
#define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1)
#define XFS_AGF_FLAGS \
{ XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \
{ XFS_AGF_UUID, "UUID" }, \
{ XFS_AGF_RMAP_BLOCKS, "RMAP_BLOCKS" }, \
+ { XFS_AGF_REFCOUNT_BLOCKS, "REFCOUNT_BLOCKS" }, \
+ { XFS_AGF_REFCOUNT_ROOT, "REFCOUNT_ROOT" }, \
+ { XFS_AGF_REFCOUNT_LEVEL, "REFCOUNT_LEVEL" }, \
{ XFS_AGF_SPARE64, "SPARE64" }
/* disk block (xfs_daddr_t) in the AG */
* padding field for v3 inodes.
*/
#define XFS_DINODE_MAGIC 0x494e /* 'IN' */
-#define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3)
typedef struct xfs_dinode {
__be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */
__be16 di_mode; /* mode and type of file */
__be64 di_changecount; /* number of attribute changes */
__be64 di_lsn; /* flush sequence */
__be64 di_flags2; /* more random flags */
- __u8 di_pad2[16]; /* more padding for future expansion */
+ __be32 di_cowextsize; /* basic cow extent size for file */
+ __u8 di_pad2[12]; /* more padding for future expansion */
/* fields only written to during inode creation */
xfs_timestamp_t di_crtime; /* time created */
* 16 bits of the XFS_XFLAG_s range.
*/
#define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */
+#define XFS_DIFLAG2_REFLINK_BIT 1 /* file's blocks may be shared */
+#define XFS_DIFLAG2_COWEXTSIZE_BIT 2 /* copy on write extent size hint */
#define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT)
+#define XFS_DIFLAG2_REFLINK (1 << XFS_DIFLAG2_REFLINK_BIT)
+#define XFS_DIFLAG2_COWEXTSIZE (1 << XFS_DIFLAG2_COWEXTSIZE_BIT)
-#define XFS_DIFLAG2_ANY (XFS_DIFLAG2_DAX)
+#define XFS_DIFLAG2_ANY \
+ (XFS_DIFLAG2_DAX | XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)
/*
* Inode number format:
#define XFS_RMAP_OWN_AG (-5ULL) /* AG freespace btree blocks */
#define XFS_RMAP_OWN_INOBT (-6ULL) /* Inode btree blocks */
#define XFS_RMAP_OWN_INODES (-7ULL) /* Inode chunk */
-#define XFS_RMAP_OWN_MIN (-8ULL) /* guard */
+#define XFS_RMAP_OWN_REFC (-8ULL) /* refcount tree */
+#define XFS_RMAP_OWN_COW (-9ULL) /* cow allocations */
+#define XFS_RMAP_OWN_MIN (-10ULL) /* guard */
#define XFS_RMAP_NON_INODE_OWNER(owner) (!!((owner) & (1ULL << 63)))
XFS_FIBT_BLOCK(mp) + 1 : \
XFS_IBT_BLOCK(mp) + 1)
+/*
+ * Reference Count Btree format definitions
+ *
+ */
+#define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */
+
+unsigned int xfs_refc_block(struct xfs_mount *mp);
+
+/*
+ * Data record/key structure
+ *
+ * Each record associates a range of physical blocks (starting at
+ * rc_startblock and ending rc_blockcount blocks later) with a reference
+ * count (rc_refcount). Extents that are being used to stage a copy on
+ * write (CoW) operation are recorded in the refcount btree with a
+ * refcount of 1. All other records must have a refcount > 1 and must
+ * track an extent mapped only by file data forks.
+ *
+ * Extents with a single owner (attributes, metadata, non-shared file
+ * data) are not tracked here. Free space is also not tracked here.
+ * This is consistent with pre-reflink XFS.
+ */
+
+/*
+ * Extents that are being used to stage a copy on write are stored
+ * in the refcount btree with a refcount of 1 and the upper bit set
+ * on the startblock. This speeds up mount time deletion of stale
+ * staging extents because they're all at the right side of the tree.
+ */
+#define XFS_REFC_COW_START ((xfs_agblock_t)(1U << 31))
+#define REFCNTBT_COWFLAG_BITLEN 1
+#define REFCNTBT_AGBLOCK_BITLEN 31
+
+struct xfs_refcount_rec {
+ __be32 rc_startblock; /* starting block number */
+ __be32 rc_blockcount; /* count of blocks */
+ __be32 rc_refcount; /* number of inodes linked here */
+};
+
+struct xfs_refcount_key {
+ __be32 rc_startblock; /* starting block number */
+};
+
+struct xfs_refcount_irec {
+ xfs_agblock_t rc_startblock; /* starting block number */
+ xfs_extlen_t rc_blockcount; /* count of free blocks */
+ xfs_nlink_t rc_refcount; /* number of inodes linked here */
+};
+
+#define MAXREFCOUNT ((xfs_nlink_t)~0U)
+#define MAXREFCEXTLEN ((xfs_extlen_t)~0U)
+
+/* btree pointer type */
+typedef __be32 xfs_refcount_ptr_t;
+
+
/*
* BMAP Btree format definitions
*
projects / cascardo / linux.git / blobdiff