Start constructing the refcount btree implementation by establishing the on-disk format and everything needed to read, write, and manipulate the refcount btree blocks. Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> --- fs/xfs/Makefile | 1 fs/xfs/libxfs/xfs_btree.c | 3 + fs/xfs/libxfs/xfs_btree.h | 3 + fs/xfs/libxfs/xfs_format.h | 32 +++++++ fs/xfs/libxfs/xfs_refcount_btree.c | 173 ++++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_refcount_btree.h | 65 ++++++++++++++ fs/xfs/libxfs/xfs_sb.c | 9 ++ fs/xfs/libxfs/xfs_shared.h | 2 fs/xfs/xfs_mount.h | 2 fs/xfs/xfs_trace.h | 11 -- 10 files changed, 291 insertions(+), 10 deletions(-) create mode 100644 fs/xfs/libxfs/xfs_refcount_btree.c create mode 100644 fs/xfs/libxfs/xfs_refcount_btree.h diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile index 9391080..9bac577 100644 --- a/fs/xfs/Makefile +++ b/fs/xfs/Makefile @@ -53,6 +53,7 @@ xfs-y += $(addprefix libxfs/, \ xfs_log_rlimit.o \ xfs_rmap.o \ xfs_rmap_btree.o \ + xfs_refcount_btree.o \ xfs_sb.o \ xfs_symlink_remote.o \ xfs_trans_resv.o \ diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c index 03ff4e4..79b8137 100644 --- a/fs/xfs/libxfs/xfs_btree.c +++ b/fs/xfs/libxfs/xfs_btree.c @@ -1134,6 +1134,9 @@ xfs_btree_set_refs( case XFS_BTNUM_RMAP: xfs_buf_set_ref(bp, XFS_RMAP_BTREE_REF); break; + case XFS_BTNUM_REFC: + xfs_buf_set_ref(bp, XFS_REFC_BTREE_REF); + break; default: ASSERT(0); } diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h index ec37ac7..0ca80d3 100644 --- a/fs/xfs/libxfs/xfs_btree.h +++ b/fs/xfs/libxfs/xfs_btree.h @@ -43,6 +43,7 @@ union xfs_btree_key { xfs_alloc_key_t alloc; struct xfs_inobt_key inobt; struct xfs_rmap_key rmap; + struct xfs_refcount_key refc; }; union xfs_btree_rec { @@ -51,6 +52,7 @@ union xfs_btree_rec { struct xfs_alloc_rec alloc; struct xfs_inobt_rec inobt; struct xfs_rmap_rec rmap; + struct xfs_refcount_rec refc; }; /* @@ -217,6 +219,7 @@ typedef struct xfs_btree_cur xfs_bmbt_irec_t b; xfs_inobt_rec_incore_t i; struct xfs_rmap_irec r; + struct xfs_refcount_irec rc; } bc_rec; /* current insert/search record value */ struct xfs_buf *bc_bufs[XFS_BTREE_MAXLEVELS]; /* buf ptr per level */ int bc_ptrs[XFS_BTREE_MAXLEVELS]; /* key/record # */ diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 611083e..7482531 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -1509,6 +1509,38 @@ xfs_owner_info_pack( 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). A record is only stored in the + * btree if the refcount is > 2. An entry in the free block btree + * means that the refcount is 0, and no entries anywhere means that + * the refcount is 1, as was true in XFS before reflinking. + */ +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 diff --git a/fs/xfs/libxfs/xfs_refcount_btree.c b/fs/xfs/libxfs/xfs_refcount_btree.c new file mode 100644 index 0000000..7067a05 --- /dev/null +++ b/fs/xfs/libxfs/xfs_refcount_btree.c @@ -0,0 +1,173 @@ +/* + * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. + * Copyright (c) 2015 Oracle. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_sb.h" +#include "xfs_mount.h" +#include "xfs_btree.h" +#include "xfs_bmap.h" +#include "xfs_refcount_btree.h" +#include "xfs_alloc.h" +#include "xfs_error.h" +#include "xfs_trace.h" +#include "xfs_cksum.h" +#include "xfs_trans.h" +#include "xfs_bit.h" + +static struct xfs_btree_cur * +xfs_refcountbt_dup_cursor( + struct xfs_btree_cur *cur) +{ + return xfs_refcountbt_init_cursor(cur->bc_mp, cur->bc_tp, + cur->bc_private.a.agbp, cur->bc_private.a.agno, + cur->bc_private.a.flist); +} + +STATIC bool +xfs_refcountbt_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_target->bt_mount; + struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); + struct xfs_perag *pag = bp->b_pag; + unsigned int level; + + if (block->bb_magic != cpu_to_be32(XFS_REFC_CRC_MAGIC)) + return false; + + if (!xfs_sb_version_hasreflink(&mp->m_sb)) + return false; + if (!xfs_btree_sblock_v5hdr_verify(bp)) + return false; + + level = be16_to_cpu(block->bb_level); + if (pag && pag->pagf_init) { + if (level >= pag->pagf_refcount_level) + return false; + } else if (level >= mp->m_ag_maxlevels) + return false; + + return xfs_btree_sblock_verify(bp, mp->m_refc_mxr[level != 0]); +} + +STATIC void +xfs_refcountbt_read_verify( + struct xfs_buf *bp) +{ + if (!xfs_btree_sblock_verify_crc(bp)) + xfs_buf_ioerror(bp, -EFSBADCRC); + else if (!xfs_refcountbt_verify(bp)) + xfs_buf_ioerror(bp, -EFSCORRUPTED); + + if (bp->b_error) { + trace_xfs_btree_corrupt(bp, _RET_IP_); + xfs_verifier_error(bp); + } +} + +STATIC void +xfs_refcountbt_write_verify( + struct xfs_buf *bp) +{ + if (!xfs_refcountbt_verify(bp)) { + trace_xfs_btree_corrupt(bp, _RET_IP_); + xfs_buf_ioerror(bp, -EFSCORRUPTED); + xfs_verifier_error(bp); + return; + } + xfs_btree_sblock_calc_crc(bp); + +} + +const struct xfs_buf_ops xfs_refcountbt_buf_ops = { + .verify_read = xfs_refcountbt_read_verify, + .verify_write = xfs_refcountbt_write_verify, +}; + +static const struct xfs_btree_ops xfs_refcountbt_ops = { + .rec_len = sizeof(struct xfs_refcount_rec), + .key_len = sizeof(struct xfs_refcount_key), + + .dup_cursor = xfs_refcountbt_dup_cursor, + .buf_ops = &xfs_refcountbt_buf_ops, +}; + +/** + * xfs_refcountbt_init_cursor() -- Allocate a new refcount btree cursor. + * + * @mp: XFS mount object + * @tp: XFS transaction + * @agbp: Buffer containing the AGF + * @agno: AG number + */ +struct xfs_btree_cur * +xfs_refcountbt_init_cursor( + struct xfs_mount *mp, + struct xfs_trans *tp, + struct xfs_buf *agbp, + xfs_agnumber_t agno, + struct xfs_bmap_free *flist) +{ + struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); + struct xfs_btree_cur *cur; + + ASSERT(agno != NULLAGNUMBER); + ASSERT(agno < mp->m_sb.sb_agcount); + cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP); + + cur->bc_tp = tp; + cur->bc_mp = mp; + cur->bc_btnum = XFS_BTNUM_REFC; + cur->bc_blocklog = mp->m_sb.sb_blocklog; + cur->bc_ops = &xfs_refcountbt_ops; + + cur->bc_nlevels = be32_to_cpu(agf->agf_refcount_level); + + cur->bc_private.a.agbp = agbp; + cur->bc_private.a.agno = agno; + cur->bc_private.a.flist = flist; + cur->bc_flags |= XFS_BTREE_CRC_BLOCKS; + + return cur; +} + +/** + * xfs_refcountbt_maxrecs() -- Calculate number of records in a refcount + * btree block. + * @mp: XFS mount object + * @blocklen: Length of block, in bytes. + * @leaf: true if this is a leaf btree block, false otherwise + */ +int +xfs_refcountbt_maxrecs( + struct xfs_mount *mp, + int blocklen, + bool leaf) +{ + blocklen -= XFS_REFCOUNT_BLOCK_LEN; + + if (leaf) + return blocklen / sizeof(struct xfs_refcount_rec); + return blocklen / (sizeof(struct xfs_refcount_key) + + sizeof(xfs_refcount_ptr_t)); +} diff --git a/fs/xfs/libxfs/xfs_refcount_btree.h b/fs/xfs/libxfs/xfs_refcount_btree.h new file mode 100644 index 0000000..d51dc1a --- /dev/null +++ b/fs/xfs/libxfs/xfs_refcount_btree.h @@ -0,0 +1,65 @@ +/* + * Copyright (c) 2000,2005 Silicon Graphics, Inc. + * Copyright (c) 2015 Oracle. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#ifndef __XFS_REFCOUNT_BTREE_H__ +#define __XFS_REFCOUNT_BTREE_H__ + +/* + * Reference Count Btree on-disk structures + */ + +struct xfs_buf; +struct xfs_btree_cur; +struct xfs_mount; + +/* + * Btree block header size + */ +#define XFS_REFCOUNT_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN + +/* + * Record, key, and pointer address macros for btree blocks. + * + * (note that some of these may appear unused, but they are used in userspace) + */ +#define XFS_REFCOUNT_REC_ADDR(block, index) \ + ((struct xfs_refcount_rec *) \ + ((char *)(block) + \ + XFS_REFCOUNT_BLOCK_LEN + \ + (((index) - 1) * sizeof(struct xfs_refcount_rec)))) + +#define XFS_REFCOUNT_KEY_ADDR(block, index) \ + ((struct xfs_refcount_key *) \ + ((char *)(block) + \ + XFS_REFCOUNT_BLOCK_LEN + \ + ((index) - 1) * sizeof(struct xfs_refcount_key))) + +#define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \ + ((xfs_refcount_ptr_t *) \ + ((char *)(block) + \ + XFS_REFCOUNT_BLOCK_LEN + \ + (maxrecs) * sizeof(struct xfs_refcount_key) + \ + ((index) - 1) * sizeof(xfs_refcount_ptr_t))) + +extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp, + struct xfs_trans *tp, struct xfs_buf *agbp, xfs_agnumber_t agno, + struct xfs_bmap_free *flist); +extern int xfs_refcountbt_maxrecs(struct xfs_mount *mp, int blocklen, + bool leaf); + +#endif /* __XFS_REFCOUNT_BTREE_H__ */ diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c index 2590c89..c195ea7 100644 --- a/fs/xfs/libxfs/xfs_sb.c +++ b/fs/xfs/libxfs/xfs_sb.c @@ -37,6 +37,8 @@ #include "xfs_ialloc_btree.h" #include "xfs_log.h" #include "xfs_rmap_btree.h" +#include "xfs_bmap.h" +#include "xfs_refcount_btree.h" /* * Physical superblock buffer manipulations. Shared with libxfs in userspace. @@ -738,6 +740,13 @@ xfs_sb_mount_common( mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2; mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2; + mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize, + true); + mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize, + false); + mp->m_refc_mnr[0] = mp->m_refc_mxr[0] / 2; + mp->m_refc_mnr[1] = mp->m_refc_mxr[1] / 2; + mp->m_bsize = XFS_FSB_TO_BB(mp, 1); mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, sbp->sb_inopblock); diff --git a/fs/xfs/libxfs/xfs_shared.h b/fs/xfs/libxfs/xfs_shared.h index fa2bb9b..bffef9e 100644 --- a/fs/xfs/libxfs/xfs_shared.h +++ b/fs/xfs/libxfs/xfs_shared.h @@ -39,6 +39,7 @@ extern const struct xfs_buf_ops xfs_agf_buf_ops; extern const struct xfs_buf_ops xfs_agfl_buf_ops; extern const struct xfs_buf_ops xfs_allocbt_buf_ops; extern const struct xfs_buf_ops xfs_rmapbt_buf_ops; +extern const struct xfs_buf_ops xfs_refcountbt_buf_ops; extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops; extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops; extern const struct xfs_buf_ops xfs_bmbt_buf_ops; @@ -216,6 +217,7 @@ int xfs_log_calc_minimum_size(struct xfs_mount *); #define XFS_INO_REF 2 #define XFS_ATTR_BTREE_REF 1 #define XFS_DQUOT_REF 1 +#define XFS_REFC_BTREE_REF 1 /* * Flags for xfs_trans_ichgtime(). diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index edced9c..caed8d3 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -92,6 +92,8 @@ typedef struct xfs_mount { uint m_inobt_mnr[2]; /* min inobt btree records */ uint m_rmap_mxr[2]; /* max rmap btree records */ uint m_rmap_mnr[2]; /* min rmap btree records */ + uint m_refc_mxr[2]; /* max refc btree records */ + uint m_refc_mnr[2]; /* min refc btree records */ uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */ uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */ uint m_in_maxlevels; /* max inobt btree levels. */ diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 1c91439..11b159a 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -38,16 +38,7 @@ struct xlog_recover_item; struct xfs_buf_log_format; struct xfs_inode_log_format; struct xfs_bmbt_irec; - -#ifndef XFS_REFCOUNT_IREC_PLACEHOLDER -#define XFS_REFCOUNT_IREC_PLACEHOLDER -/* Placeholder definition to avoid breaking bisectability. */ -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 */ -}; -#endif +struct xfs_refcount_irec; DECLARE_EVENT_CLASS(xfs_attr_list_class, TP_PROTO(struct xfs_attr_list_context *ctx), _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs