From: Darrick J. Wong <djwong@xxxxxxxxxx>
Plumb in the pieces we need to embed the root of the realtime refcount
btree in an inode's data fork, complete with new fork type and
on-disk interpretation functions.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_format.h | 8 +
fs/xfs/libxfs/xfs_inode_fork.c | 8 +
fs/xfs/libxfs/xfs_rtrefcount_btree.c | 236 ++++++++++++++++++++++++++++++++++
fs/xfs/libxfs/xfs_rtrefcount_btree.h | 112 ++++++++++++++++
fs/xfs/xfs_inode_item_recover.c | 4 +
fs/xfs/xfs_ondisk.h | 1
6 files changed, 366 insertions(+), 3 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 20af5b730d6d..17be73c45226 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -1805,6 +1805,14 @@ typedef __be32 xfs_refcount_ptr_t;
*/
#define XFS_RTREFC_CRC_MAGIC 0x52434e54 /* 'RCNT' */
+/*
+ * rt refcount root header, on-disk form only.
+ */
+struct xfs_rtrefcount_root {
+ __be16 bb_level; /* 0 is a leaf */
+ __be16 bb_numrecs; /* current # of data records */
+};
+
/* inode-rooted btree pointer type */
typedef __be64 xfs_rtrefcount_ptr_t;
diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c
index e69ec68b5a9d..7aae3ae810b7 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.c
+++ b/fs/xfs/libxfs/xfs_inode_fork.c
@@ -28,6 +28,7 @@
#include "xfs_health.h"
#include "xfs_symlink_remote.h"
#include "xfs_rtrmap_btree.h"
+#include "xfs_rtrefcount_btree.h"
struct kmem_cache *xfs_ifork_cache;
@@ -269,8 +270,7 @@ xfs_iformat_data_fork(
case XFS_DINODE_FMT_REFCOUNT:
if (!xfs_has_rtreflink(ip->i_mount))
return -EFSCORRUPTED;
- ASSERT(0); /* to be implemented later */
- return -EFSCORRUPTED;
+ return xfs_iformat_rtrefcount(ip, dip);
default:
xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__,
dip, sizeof(*dip), __this_address);
@@ -658,7 +658,9 @@ xfs_iflush_fork(
break;
case XFS_DINODE_FMT_REFCOUNT:
- ASSERT(0); /* to be implemented later */
+ ASSERT(whichfork == XFS_DATA_FORK);
+ if (iip->ili_fields & brootflag[whichfork])
+ xfs_iflush_rtrefcount(ip, dip);
break;
default:
diff --git a/fs/xfs/libxfs/xfs_rtrefcount_btree.c b/fs/xfs/libxfs/xfs_rtrefcount_btree.c
index 74c5cf9a0d3a..a43ee6d7b547 100644
--- a/fs/xfs/libxfs/xfs_rtrefcount_btree.c
+++ b/fs/xfs/libxfs/xfs_rtrefcount_btree.c
@@ -85,6 +85,41 @@ xfs_rtrefcountbt_get_maxrecs(
return cur->bc_mp->m_rtrefc_mxr[level != 0];
}
+/*
+ * Calculate number of records in a realtime refcount btree inode root.
+ */
+unsigned int
+xfs_rtrefcountbt_droot_maxrecs(
+ unsigned int blocklen,
+ bool leaf)
+{
+ blocklen -= sizeof(struct xfs_rtrefcount_root);
+
+ if (leaf)
+ return blocklen / sizeof(struct xfs_refcount_rec);
+ return blocklen / (2 * sizeof(struct xfs_refcount_key) +
+ sizeof(xfs_rtrefcount_ptr_t));
+}
+
+/*
+ * Get the maximum records we could store in the on-disk format.
+ *
+ * For non-root nodes this is equivalent to xfs_rtrefcountbt_get_maxrecs, but
+ * for the root node this checks the available space in the dinode fork so that
+ * we can resize the in-memory buffer to match it. After a resize to the
+ * maximum size this function returns the same value as
+ * xfs_rtrefcountbt_get_maxrecs for the root node, too.
+ */
+STATIC int
+xfs_rtrefcountbt_get_dmaxrecs(
+ struct xfs_btree_cur *cur,
+ int level)
+{
+ if (level != cur->bc_nlevels - 1)
+ return cur->bc_mp->m_rtrefc_mxr[level != 0];
+ return xfs_rtrefcountbt_droot_maxrecs(cur->bc_ino.forksize, level == 0);
+}
+
STATIC void
xfs_rtrefcountbt_init_key_from_rec(
union xfs_btree_key *key,
@@ -255,6 +290,68 @@ xfs_rtrefcountbt_keys_contiguous(
be32_to_cpu(key2->refc.rc_startblock));
}
+/* Move the rt refcount btree root from one incore buffer to another. */
+static void
+xfs_rtrefcountbt_broot_move(
+ struct xfs_inode *ip,
+ int whichfork,
+ struct xfs_btree_block *dst_broot,
+ size_t dst_bytes,
+ struct xfs_btree_block *src_broot,
+ size_t src_bytes,
+ unsigned int level,
+ unsigned int numrecs)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ void *dptr;
+ void *sptr;
+
+ ASSERT(xfs_rtrefcount_droot_space(src_broot) <=
+ xfs_inode_fork_size(ip, whichfork));
+
+ /*
+ * We always have to move the pointers because they are not butted
+ * against the btree block header.
+ */
+ if (numrecs && level > 0) {
+ sptr = xfs_rtrefcount_broot_ptr_addr(mp, src_broot, 1,
+ src_bytes);
+ dptr = xfs_rtrefcount_broot_ptr_addr(mp, dst_broot, 1,
+ dst_bytes);
+ memmove(dptr, sptr, numrecs * sizeof(xfs_fsblock_t));
+ }
+
+ if (src_broot == dst_broot)
+ return;
+
+ /*
+ * If the root is being totally relocated, we have to migrate the block
+ * header and the keys/records that come after it.
+ */
+ memcpy(dst_broot, src_broot, XFS_RTREFCOUNT_BLOCK_LEN);
+
+ if (!numrecs)
+ return;
+
+ if (level == 0) {
+ sptr = xfs_rtrefcount_rec_addr(src_broot, 1);
+ dptr = xfs_rtrefcount_rec_addr(dst_broot, 1);
+ memcpy(dptr, sptr,
+ numrecs * sizeof(struct xfs_refcount_rec));
+ } else {
+ sptr = xfs_rtrefcount_key_addr(src_broot, 1);
+ dptr = xfs_rtrefcount_key_addr(dst_broot, 1);
+ memcpy(dptr, sptr,
+ numrecs * sizeof(struct xfs_refcount_key));
+ }
+}
+
+static const struct xfs_ifork_broot_ops xfs_rtrefcountbt_iroot_ops = {
+ .maxrecs = xfs_rtrefcountbt_maxrecs,
+ .size = xfs_rtrefcount_broot_space_calc,
+ .move = xfs_rtrefcountbt_broot_move,
+};
+
const struct xfs_btree_ops xfs_rtrefcountbt_ops = {
.rec_len = sizeof(struct xfs_refcount_rec),
.key_len = sizeof(struct xfs_refcount_key),
@@ -266,6 +363,7 @@ const struct xfs_btree_ops xfs_rtrefcountbt_ops = {
.free_block = xfs_btree_free_imeta_block,
.get_minrecs = xfs_rtrefcountbt_get_minrecs,
.get_maxrecs = xfs_rtrefcountbt_get_maxrecs,
+ .get_dmaxrecs = xfs_rtrefcountbt_get_dmaxrecs,
.init_key_from_rec = xfs_rtrefcountbt_init_key_from_rec,
.init_high_key_from_rec = xfs_rtrefcountbt_init_high_key_from_rec,
.init_rec_from_cur = xfs_rtrefcountbt_init_rec_from_cur,
@@ -276,6 +374,7 @@ const struct xfs_btree_ops xfs_rtrefcountbt_ops = {
.keys_inorder = xfs_rtrefcountbt_keys_inorder,
.recs_inorder = xfs_rtrefcountbt_recs_inorder,
.keys_contiguous = xfs_rtrefcountbt_keys_contiguous,
+ .iroot_ops = &xfs_rtrefcountbt_iroot_ops,
};
/* Initialize a new rt refcount btree cursor. */
@@ -529,3 +628,140 @@ xfs_rtrefcountbt_calc_reserves(
return xfs_rtrefcountbt_max_size(mp,
xfs_rtb_to_rtxt(mp, mp->m_sb.sb_rgblocks));
}
+
+/*
+ * Convert on-disk form of btree root to in-memory form.
+ */
+STATIC void
+xfs_rtrefcountbt_from_disk(
+ struct xfs_inode *ip,
+ struct xfs_rtrefcount_root *dblock,
+ int dblocklen,
+ struct xfs_btree_block *rblock)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_refcount_key *fkp;
+ __be64 *fpp;
+ struct xfs_refcount_key *tkp;
+ __be64 *tpp;
+ struct xfs_refcount_rec *frp;
+ struct xfs_refcount_rec *trp;
+ unsigned int numrecs;
+ unsigned int maxrecs;
+ unsigned int rblocklen;
+
+ rblocklen = xfs_rtrefcount_broot_space(mp, dblock);
+
+ xfs_btree_init_block(mp, rblock, &xfs_rtrefcountbt_ops, 0, 0,
+ ip->i_ino);
+
+ rblock->bb_level = dblock->bb_level;
+ rblock->bb_numrecs = dblock->bb_numrecs;
+
+ if (be16_to_cpu(rblock->bb_level) > 0) {
+ maxrecs = xfs_rtrefcountbt_droot_maxrecs(dblocklen, false);
+ fkp = xfs_rtrefcount_droot_key_addr(dblock, 1);
+ tkp = xfs_rtrefcount_key_addr(rblock, 1);
+ fpp = xfs_rtrefcount_droot_ptr_addr(dblock, 1, maxrecs);
+ tpp = xfs_rtrefcount_broot_ptr_addr(mp, rblock, 1, rblocklen);
+ numrecs = be16_to_cpu(dblock->bb_numrecs);
+ memcpy(tkp, fkp, 2 * sizeof(*fkp) * numrecs);
+ memcpy(tpp, fpp, sizeof(*fpp) * numrecs);
+ } else {
+ frp = xfs_rtrefcount_droot_rec_addr(dblock, 1);
+ trp = xfs_rtrefcount_rec_addr(rblock, 1);
+ numrecs = be16_to_cpu(dblock->bb_numrecs);
+ memcpy(trp, frp, sizeof(*frp) * numrecs);
+ }
+}
+
+/* Load a realtime reference count btree root in from disk. */
+int
+xfs_iformat_rtrefcount(
+ struct xfs_inode *ip,
+ struct xfs_dinode *dip)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
+ struct xfs_rtrefcount_root *dfp = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
+ unsigned int numrecs;
+ unsigned int level;
+ int dsize;
+
+ dsize = XFS_DFORK_SIZE(dip, mp, XFS_DATA_FORK);
+ numrecs = be16_to_cpu(dfp->bb_numrecs);
+ level = be16_to_cpu(dfp->bb_level);
+
+ if (level > mp->m_rtrefc_maxlevels ||
+ xfs_rtrefcount_droot_space_calc(level, numrecs) > dsize)
+ return -EFSCORRUPTED;
+
+ xfs_iroot_alloc(ip, XFS_DATA_FORK,
+ xfs_rtrefcount_broot_space_calc(mp, level, numrecs));
+ xfs_rtrefcountbt_from_disk(ip, dfp, dsize, ifp->if_broot);
+ return 0;
+}
+
+/*
+ * Convert in-memory form of btree root to on-disk form.
+ */
+void
+xfs_rtrefcountbt_to_disk(
+ struct xfs_mount *mp,
+ struct xfs_btree_block *rblock,
+ int rblocklen,
+ struct xfs_rtrefcount_root *dblock,
+ int dblocklen)
+{
+ struct xfs_refcount_key *fkp;
+ __be64 *fpp;
+ struct xfs_refcount_key *tkp;
+ __be64 *tpp;
+ struct xfs_refcount_rec *frp;
+ struct xfs_refcount_rec *trp;
+ unsigned int maxrecs;
+ unsigned int numrecs;
+
+ ASSERT(rblock->bb_magic == cpu_to_be32(XFS_RTREFC_CRC_MAGIC));
+ ASSERT(uuid_equal(&rblock->bb_u.l.bb_uuid, &mp->m_sb.sb_meta_uuid));
+ ASSERT(rblock->bb_u.l.bb_blkno == cpu_to_be64(XFS_BUF_DADDR_NULL));
+ ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLFSBLOCK));
+ ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLFSBLOCK));
+
+ dblock->bb_level = rblock->bb_level;
+ dblock->bb_numrecs = rblock->bb_numrecs;
+
+ if (be16_to_cpu(rblock->bb_level) > 0) {
+ maxrecs = xfs_rtrefcountbt_droot_maxrecs(dblocklen, false);
+ fkp = xfs_rtrefcount_key_addr(rblock, 1);
+ tkp = xfs_rtrefcount_droot_key_addr(dblock, 1);
+ fpp = xfs_rtrefcount_broot_ptr_addr(mp, rblock, 1, rblocklen);
+ tpp = xfs_rtrefcount_droot_ptr_addr(dblock, 1, maxrecs);
+ numrecs = be16_to_cpu(rblock->bb_numrecs);
+ memcpy(tkp, fkp, 2 * sizeof(*fkp) * numrecs);
+ memcpy(tpp, fpp, sizeof(*fpp) * numrecs);
+ } else {
+ frp = xfs_rtrefcount_rec_addr(rblock, 1);
+ trp = xfs_rtrefcount_droot_rec_addr(dblock, 1);
+ numrecs = be16_to_cpu(rblock->bb_numrecs);
+ memcpy(trp, frp, sizeof(*frp) * numrecs);
+ }
+}
+
+/* Flush a realtime reference count btree root out to disk. */
+void
+xfs_iflush_rtrefcount(
+ struct xfs_inode *ip,
+ struct xfs_dinode *dip)
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
+ struct xfs_rtrefcount_root *dfp = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
+
+ ASSERT(ifp->if_broot != NULL);
+ ASSERT(ifp->if_broot_bytes > 0);
+ ASSERT(xfs_rtrefcount_droot_space(ifp->if_broot) <=
+ xfs_inode_fork_size(ip, XFS_DATA_FORK));
+ xfs_rtrefcountbt_to_disk(ip->i_mount, ifp->if_broot,
+ ifp->if_broot_bytes, dfp,
+ XFS_DFORK_SIZE(dip, ip->i_mount, XFS_DATA_FORK));
+}
diff --git a/fs/xfs/libxfs/xfs_rtrefcount_btree.h b/fs/xfs/libxfs/xfs_rtrefcount_btree.h
index ffda0b063bcf..d2fe2004568d 100644
--- a/fs/xfs/libxfs/xfs_rtrefcount_btree.h
+++ b/fs/xfs/libxfs/xfs_rtrefcount_btree.h
@@ -27,6 +27,7 @@ void xfs_rtrefcountbt_commit_staged_btree(struct xfs_btree_cur *cur,
unsigned int xfs_rtrefcountbt_maxrecs(struct xfs_mount *mp,
unsigned int blocklen, bool leaf);
void xfs_rtrefcountbt_compute_maxlevels(struct xfs_mount *mp);
+unsigned int xfs_rtrefcountbt_droot_maxrecs(unsigned int blocklen, bool leaf);
/*
* Addresses of records, keys, and pointers within an incore rtrefcountbt block.
@@ -74,4 +75,115 @@ int xfs_rtrefcountbt_create_path(struct xfs_mount *mp, xfs_rgnumber_t rgno,
xfs_filblks_t xfs_rtrefcountbt_calc_reserves(struct xfs_mount *mp);
+/* Addresses of key, pointers, and records within an ondisk rtrefcount block. */
+
+static inline struct xfs_refcount_rec *
+xfs_rtrefcount_droot_rec_addr(
+ struct xfs_rtrefcount_root *block,
+ unsigned int index)
+{
+ return (struct xfs_refcount_rec *)
+ ((char *)(block + 1) +
+ (index - 1) * sizeof(struct xfs_refcount_rec));
+}
+
+static inline struct xfs_refcount_key *
+xfs_rtrefcount_droot_key_addr(
+ struct xfs_rtrefcount_root *block,
+ unsigned int index)
+{
+ return (struct xfs_refcount_key *)
+ ((char *)(block + 1) +
+ (index - 1) * sizeof(struct xfs_refcount_key));
+}
+
+static inline xfs_rtrefcount_ptr_t *
+xfs_rtrefcount_droot_ptr_addr(
+ struct xfs_rtrefcount_root *block,
+ unsigned int index,
+ unsigned int maxrecs)
+{
+ return (xfs_rtrefcount_ptr_t *)
+ ((char *)(block + 1) +
+ maxrecs * sizeof(struct xfs_refcount_key) +
+ (index - 1) * sizeof(xfs_rtrefcount_ptr_t));
+}
+
+/*
+ * Address of pointers within the incore btree root.
+ *
+ * These are to be used when we know the size of the block and
+ * we don't have a cursor.
+ */
+static inline xfs_rtrefcount_ptr_t *
+xfs_rtrefcount_broot_ptr_addr(
+ struct xfs_mount *mp,
+ struct xfs_btree_block *bb,
+ unsigned int index,
+ unsigned int block_size)
+{
+ return xfs_rtrefcount_ptr_addr(bb, index,
+ xfs_rtrefcountbt_maxrecs(mp, block_size, false));
+}
+
+/*
+ * Compute the space required for the incore btree root containing the given
+ * number of records.
+ */
+static inline size_t
+xfs_rtrefcount_broot_space_calc(
+ struct xfs_mount *mp,
+ unsigned int level,
+ unsigned int nrecs)
+{
+ size_t sz = XFS_RTREFCOUNT_BLOCK_LEN;
+
+ if (level > 0)
+ return sz + nrecs * (sizeof(struct xfs_refcount_key) +
+ sizeof(xfs_rtrefcount_ptr_t));
+ return sz + nrecs * sizeof(struct xfs_refcount_rec);
+}
+
+/*
+ * Compute the space required for the incore btree root given the ondisk
+ * btree root block.
+ */
+static inline size_t
+xfs_rtrefcount_broot_space(struct xfs_mount *mp, struct xfs_rtrefcount_root *bb)
+{
+ return xfs_rtrefcount_broot_space_calc(mp, be16_to_cpu(bb->bb_level),
+ be16_to_cpu(bb->bb_numrecs));
+}
+
+/* Compute the space required for the ondisk root block. */
+static inline size_t
+xfs_rtrefcount_droot_space_calc(
+ unsigned int level,
+ unsigned int nrecs)
+{
+ size_t sz = sizeof(struct xfs_rtrefcount_root);
+
+ if (level > 0)
+ return sz + nrecs * (sizeof(struct xfs_refcount_key) +
+ sizeof(xfs_rtrefcount_ptr_t));
+ return sz + nrecs * sizeof(struct xfs_refcount_rec);
+}
+
+/*
+ * Compute the space required for the ondisk root block given an incore root
+ * block.
+ */
+static inline size_t
+xfs_rtrefcount_droot_space(struct xfs_btree_block *bb)
+{
+ return xfs_rtrefcount_droot_space_calc(be16_to_cpu(bb->bb_level),
+ be16_to_cpu(bb->bb_numrecs));
+}
+
+int xfs_iformat_rtrefcount(struct xfs_inode *ip, struct xfs_dinode *dip);
+void xfs_rtrefcountbt_to_disk(struct xfs_mount *mp,
+ struct xfs_btree_block *rblock, int rblocklen,
+ struct xfs_rtrefcount_root *dblock, int dblocklen);
+void xfs_iflush_rtrefcount(struct xfs_inode *ip, struct xfs_dinode *dip);
+
#endif /* __XFS_RTREFCOUNT_BTREE_H__ */
diff --git a/fs/xfs/xfs_inode_item_recover.c b/fs/xfs/xfs_inode_item_recover.c
index feeba1dff01e..f13bf35793f1 100644
--- a/fs/xfs/xfs_inode_item_recover.c
+++ b/fs/xfs/xfs_inode_item_recover.c
@@ -23,6 +23,7 @@
#include "xfs_icache.h"
#include "xfs_bmap_btree.h"
#include "xfs_rtrmap_btree.h"
+#include "xfs_rtrefcount_btree.h"
STATIC void
xlog_recover_inode_ra_pass2(
@@ -284,6 +285,9 @@ xlog_recover_inode_dbroot(
case XFS_DINODE_FMT_RMAP:
xfs_rtrmapbt_to_disk(mp, src, len, dfork, dsize);
break;
+ case XFS_DINODE_FMT_REFCOUNT:
+ xfs_rtrefcountbt_to_disk(mp, src, len, dfork, dsize);
+ break;
default:
ASSERT(0);
return -EFSCORRUPTED;
diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
index 94bbb6351d3d..7c14dd104191 100644
--- a/fs/xfs/xfs_ondisk.h
+++ b/fs/xfs/xfs_ondisk.h
@@ -80,6 +80,7 @@ xfs_check_ondisk_structs(void)
XFS_CHECK_STRUCT_SIZE(xfs_rtrmap_ptr_t, 8);
XFS_CHECK_STRUCT_SIZE(struct xfs_rtrmap_root, 4);
XFS_CHECK_STRUCT_SIZE(xfs_rtrefcount_ptr_t, 8);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_rtrefcount_root, 4);
/*
* m68k has problems with xfs_attr_leaf_name_remote_t, but we pad it to
