diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_ag.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_ag.c | 596 |
1 files changed, 596 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c new file mode 100644 index 000000000..9331f3516 --- /dev/null +++ b/fs/xfs/libxfs/xfs_ag.c @@ -0,0 +1,596 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2000-2005 Silicon Graphics, Inc. + * Copyright (c) 2018 Red Hat, Inc. + * All rights reserved. + */ + +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_trans_resv.h" +#include "xfs_bit.h" +#include "xfs_sb.h" +#include "xfs_mount.h" +#include "xfs_btree.h" +#include "xfs_alloc_btree.h" +#include "xfs_rmap_btree.h" +#include "xfs_alloc.h" +#include "xfs_ialloc.h" +#include "xfs_rmap.h" +#include "xfs_ag.h" +#include "xfs_ag_resv.h" +#include "xfs_health.h" + +static int +xfs_get_aghdr_buf( + struct xfs_mount *mp, + xfs_daddr_t blkno, + size_t numblks, + struct xfs_buf **bpp, + const struct xfs_buf_ops *ops) +{ + struct xfs_buf *bp; + int error; + + error = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, 0, &bp); + if (error) + return error; + + xfs_buf_zero(bp, 0, BBTOB(bp->b_length)); + bp->b_bn = blkno; + bp->b_maps[0].bm_bn = blkno; + bp->b_ops = ops; + + *bpp = bp; + return 0; +} + +static inline bool is_log_ag(struct xfs_mount *mp, struct aghdr_init_data *id) +{ + return mp->m_sb.sb_logstart > 0 && + id->agno == XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart); +} + +/* + * Generic btree root block init function + */ +static void +xfs_btroot_init( + struct xfs_mount *mp, + struct xfs_buf *bp, + struct aghdr_init_data *id) +{ + xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno); +} + +/* Finish initializing a free space btree. */ +static void +xfs_freesp_init_recs( + struct xfs_mount *mp, + struct xfs_buf *bp, + struct aghdr_init_data *id) +{ + struct xfs_alloc_rec *arec; + struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); + + arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1); + arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks); + + if (is_log_ag(mp, id)) { + struct xfs_alloc_rec *nrec; + xfs_agblock_t start = XFS_FSB_TO_AGBNO(mp, + mp->m_sb.sb_logstart); + + ASSERT(start >= mp->m_ag_prealloc_blocks); + if (start != mp->m_ag_prealloc_blocks) { + /* + * Modify first record to pad stripe align of log + */ + arec->ar_blockcount = cpu_to_be32(start - + mp->m_ag_prealloc_blocks); + nrec = arec + 1; + + /* + * Insert second record at start of internal log + * which then gets trimmed. + */ + nrec->ar_startblock = cpu_to_be32( + be32_to_cpu(arec->ar_startblock) + + be32_to_cpu(arec->ar_blockcount)); + arec = nrec; + be16_add_cpu(&block->bb_numrecs, 1); + } + /* + * Change record start to after the internal log + */ + be32_add_cpu(&arec->ar_startblock, mp->m_sb.sb_logblocks); + } + + /* + * Calculate the record block count and check for the case where + * the log might have consumed all available space in the AG. If + * so, reset the record count to 0 to avoid exposure of an invalid + * record start block. + */ + arec->ar_blockcount = cpu_to_be32(id->agsize - + be32_to_cpu(arec->ar_startblock)); + if (!arec->ar_blockcount) + block->bb_numrecs = 0; +} + +/* + * Alloc btree root block init functions + */ +static void +xfs_bnoroot_init( + struct xfs_mount *mp, + struct xfs_buf *bp, + struct aghdr_init_data *id) +{ + xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, id->agno); + xfs_freesp_init_recs(mp, bp, id); +} + +static void +xfs_cntroot_init( + struct xfs_mount *mp, + struct xfs_buf *bp, + struct aghdr_init_data *id) +{ + xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, id->agno); + xfs_freesp_init_recs(mp, bp, id); +} + +/* + * Reverse map root block init + */ +static void +xfs_rmaproot_init( + struct xfs_mount *mp, + struct xfs_buf *bp, + struct aghdr_init_data *id) +{ + struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); + struct xfs_rmap_rec *rrec; + + xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno); + + /* + * mark the AG header regions as static metadata The BNO + * btree block is the first block after the headers, so + * it's location defines the size of region the static + * metadata consumes. + * + * Note: unlike mkfs, we never have to account for log + * space when growing the data regions + */ + rrec = XFS_RMAP_REC_ADDR(block, 1); + rrec->rm_startblock = 0; + rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp)); + rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS); + rrec->rm_offset = 0; + + /* account freespace btree root blocks */ + rrec = XFS_RMAP_REC_ADDR(block, 2); + rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp)); + rrec->rm_blockcount = cpu_to_be32(2); + rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG); + rrec->rm_offset = 0; + + /* account inode btree root blocks */ + rrec = XFS_RMAP_REC_ADDR(block, 3); + rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp)); + rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) - + XFS_IBT_BLOCK(mp)); + rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT); + rrec->rm_offset = 0; + + /* account for rmap btree root */ + rrec = XFS_RMAP_REC_ADDR(block, 4); + rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp)); + rrec->rm_blockcount = cpu_to_be32(1); + rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG); + rrec->rm_offset = 0; + + /* account for refc btree root */ + if (xfs_sb_version_hasreflink(&mp->m_sb)) { + rrec = XFS_RMAP_REC_ADDR(block, 5); + rrec->rm_startblock = cpu_to_be32(xfs_refc_block(mp)); + rrec->rm_blockcount = cpu_to_be32(1); + rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC); + rrec->rm_offset = 0; + be16_add_cpu(&block->bb_numrecs, 1); + } + + /* account for the log space */ + if (is_log_ag(mp, id)) { + rrec = XFS_RMAP_REC_ADDR(block, + be16_to_cpu(block->bb_numrecs) + 1); + rrec->rm_startblock = cpu_to_be32( + XFS_FSB_TO_AGBNO(mp, mp->m_sb.sb_logstart)); + rrec->rm_blockcount = cpu_to_be32(mp->m_sb.sb_logblocks); + rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_LOG); + rrec->rm_offset = 0; + be16_add_cpu(&block->bb_numrecs, 1); + } +} + +/* + * Initialise new secondary superblocks with the pre-grow geometry, but mark + * them as "in progress" so we know they haven't yet been activated. This will + * get cleared when the update with the new geometry information is done after + * changes to the primary are committed. This isn't strictly necessary, but we + * get it for free with the delayed buffer write lists and it means we can tell + * if a grow operation didn't complete properly after the fact. + */ +static void +xfs_sbblock_init( + struct xfs_mount *mp, + struct xfs_buf *bp, + struct aghdr_init_data *id) +{ + struct xfs_dsb *dsb = bp->b_addr; + + xfs_sb_to_disk(dsb, &mp->m_sb); + dsb->sb_inprogress = 1; +} + +static void +xfs_agfblock_init( + struct xfs_mount *mp, + struct xfs_buf *bp, + struct aghdr_init_data *id) +{ + struct xfs_agf *agf = bp->b_addr; + xfs_extlen_t tmpsize; + + agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC); + agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION); + agf->agf_seqno = cpu_to_be32(id->agno); + agf->agf_length = cpu_to_be32(id->agsize); + agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp)); + agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp)); + agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1); + agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1); + if (xfs_sb_version_hasrmapbt(&mp->m_sb)) { + agf->agf_roots[XFS_BTNUM_RMAPi] = + cpu_to_be32(XFS_RMAP_BLOCK(mp)); + agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1); + agf->agf_rmap_blocks = cpu_to_be32(1); + } + + agf->agf_flfirst = cpu_to_be32(1); + agf->agf_fllast = 0; + agf->agf_flcount = 0; + tmpsize = id->agsize - mp->m_ag_prealloc_blocks; + agf->agf_freeblks = cpu_to_be32(tmpsize); + agf->agf_longest = cpu_to_be32(tmpsize); + if (xfs_sb_version_hascrc(&mp->m_sb)) + uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid); + if (xfs_sb_version_hasreflink(&mp->m_sb)) { + agf->agf_refcount_root = cpu_to_be32( + xfs_refc_block(mp)); + agf->agf_refcount_level = cpu_to_be32(1); + agf->agf_refcount_blocks = cpu_to_be32(1); + } + + if (is_log_ag(mp, id)) { + int64_t logblocks = mp->m_sb.sb_logblocks; + + be32_add_cpu(&agf->agf_freeblks, -logblocks); + agf->agf_longest = cpu_to_be32(id->agsize - + XFS_FSB_TO_AGBNO(mp, mp->m_sb.sb_logstart) - logblocks); + } +} + +static void +xfs_agflblock_init( + struct xfs_mount *mp, + struct xfs_buf *bp, + struct aghdr_init_data *id) +{ + struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp); + __be32 *agfl_bno; + int bucket; + + if (xfs_sb_version_hascrc(&mp->m_sb)) { + agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC); + agfl->agfl_seqno = cpu_to_be32(id->agno); + uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid); + } + + agfl_bno = xfs_buf_to_agfl_bno(bp); + for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++) + agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK); +} + +static void +xfs_agiblock_init( + struct xfs_mount *mp, + struct xfs_buf *bp, + struct aghdr_init_data *id) +{ + struct xfs_agi *agi = bp->b_addr; + int bucket; + + agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC); + agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION); + agi->agi_seqno = cpu_to_be32(id->agno); + agi->agi_length = cpu_to_be32(id->agsize); + agi->agi_count = 0; + agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp)); + agi->agi_level = cpu_to_be32(1); + agi->agi_freecount = 0; + agi->agi_newino = cpu_to_be32(NULLAGINO); + agi->agi_dirino = cpu_to_be32(NULLAGINO); + if (xfs_sb_version_hascrc(&mp->m_sb)) + uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid); + if (xfs_sb_version_hasfinobt(&mp->m_sb)) { + agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp)); + agi->agi_free_level = cpu_to_be32(1); + } + for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) + agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO); + if (xfs_sb_version_hasinobtcounts(&mp->m_sb)) { + agi->agi_iblocks = cpu_to_be32(1); + if (xfs_sb_version_hasfinobt(&mp->m_sb)) + agi->agi_fblocks = cpu_to_be32(1); + } +} + +typedef void (*aghdr_init_work_f)(struct xfs_mount *mp, struct xfs_buf *bp, + struct aghdr_init_data *id); +static int +xfs_ag_init_hdr( + struct xfs_mount *mp, + struct aghdr_init_data *id, + aghdr_init_work_f work, + const struct xfs_buf_ops *ops) +{ + struct xfs_buf *bp; + int error; + + error = xfs_get_aghdr_buf(mp, id->daddr, id->numblks, &bp, ops); + if (error) + return error; + + (*work)(mp, bp, id); + + xfs_buf_delwri_queue(bp, &id->buffer_list); + xfs_buf_relse(bp); + return 0; +} + +struct xfs_aghdr_grow_data { + xfs_daddr_t daddr; + size_t numblks; + const struct xfs_buf_ops *ops; + aghdr_init_work_f work; + xfs_btnum_t type; + bool need_init; +}; + +/* + * Prepare new AG headers to be written to disk. We use uncached buffers here, + * as it is assumed these new AG headers are currently beyond the currently + * valid filesystem address space. Using cached buffers would trip over EOFS + * corruption detection alogrithms in the buffer cache lookup routines. + * + * This is a non-transactional function, but the prepared buffers are added to a + * delayed write buffer list supplied by the caller so they can submit them to + * disk and wait on them as required. + */ +int +xfs_ag_init_headers( + struct xfs_mount *mp, + struct aghdr_init_data *id) + +{ + struct xfs_aghdr_grow_data aghdr_data[] = { + { /* SB */ + .daddr = XFS_AG_DADDR(mp, id->agno, XFS_SB_DADDR), + .numblks = XFS_FSS_TO_BB(mp, 1), + .ops = &xfs_sb_buf_ops, + .work = &xfs_sbblock_init, + .need_init = true + }, + { /* AGF */ + .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGF_DADDR(mp)), + .numblks = XFS_FSS_TO_BB(mp, 1), + .ops = &xfs_agf_buf_ops, + .work = &xfs_agfblock_init, + .need_init = true + }, + { /* AGFL */ + .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGFL_DADDR(mp)), + .numblks = XFS_FSS_TO_BB(mp, 1), + .ops = &xfs_agfl_buf_ops, + .work = &xfs_agflblock_init, + .need_init = true + }, + { /* AGI */ + .daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGI_DADDR(mp)), + .numblks = XFS_FSS_TO_BB(mp, 1), + .ops = &xfs_agi_buf_ops, + .work = &xfs_agiblock_init, + .need_init = true + }, + { /* BNO root block */ + .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)), + .numblks = BTOBB(mp->m_sb.sb_blocksize), + .ops = &xfs_bnobt_buf_ops, + .work = &xfs_bnoroot_init, + .need_init = true + }, + { /* CNT root block */ + .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)), + .numblks = BTOBB(mp->m_sb.sb_blocksize), + .ops = &xfs_cntbt_buf_ops, + .work = &xfs_cntroot_init, + .need_init = true + }, + { /* INO root block */ + .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_IBT_BLOCK(mp)), + .numblks = BTOBB(mp->m_sb.sb_blocksize), + .ops = &xfs_inobt_buf_ops, + .work = &xfs_btroot_init, + .type = XFS_BTNUM_INO, + .need_init = true + }, + { /* FINO root block */ + .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_FIBT_BLOCK(mp)), + .numblks = BTOBB(mp->m_sb.sb_blocksize), + .ops = &xfs_finobt_buf_ops, + .work = &xfs_btroot_init, + .type = XFS_BTNUM_FINO, + .need_init = xfs_sb_version_hasfinobt(&mp->m_sb) + }, + { /* RMAP root block */ + .daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_RMAP_BLOCK(mp)), + .numblks = BTOBB(mp->m_sb.sb_blocksize), + .ops = &xfs_rmapbt_buf_ops, + .work = &xfs_rmaproot_init, + .need_init = xfs_sb_version_hasrmapbt(&mp->m_sb) + }, + { /* REFC root block */ + .daddr = XFS_AGB_TO_DADDR(mp, id->agno, xfs_refc_block(mp)), + .numblks = BTOBB(mp->m_sb.sb_blocksize), + .ops = &xfs_refcountbt_buf_ops, + .work = &xfs_btroot_init, + .type = XFS_BTNUM_REFC, + .need_init = xfs_sb_version_hasreflink(&mp->m_sb) + }, + { /* NULL terminating block */ + .daddr = XFS_BUF_DADDR_NULL, + } + }; + struct xfs_aghdr_grow_data *dp; + int error = 0; + + /* Account for AG free space in new AG */ + id->nfree += id->agsize - mp->m_ag_prealloc_blocks; + for (dp = &aghdr_data[0]; dp->daddr != XFS_BUF_DADDR_NULL; dp++) { + if (!dp->need_init) + continue; + + id->daddr = dp->daddr; + id->numblks = dp->numblks; + id->type = dp->type; + error = xfs_ag_init_hdr(mp, id, dp->work, dp->ops); + if (error) + break; + } + return error; +} + +/* + * Extent the AG indicated by the @id by the length passed in + */ +int +xfs_ag_extend_space( + struct xfs_mount *mp, + struct xfs_trans *tp, + struct aghdr_init_data *id, + xfs_extlen_t len) +{ + struct xfs_buf *bp; + struct xfs_agi *agi; + struct xfs_agf *agf; + int error; + + /* + * Change the agi length. + */ + error = xfs_ialloc_read_agi(mp, tp, id->agno, &bp); + if (error) + return error; + + agi = bp->b_addr; + be32_add_cpu(&agi->agi_length, len); + ASSERT(id->agno == mp->m_sb.sb_agcount - 1 || + be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks); + xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH); + + /* + * Change agf length. + */ + error = xfs_alloc_read_agf(mp, tp, id->agno, 0, &bp); + if (error) + return error; + + agf = bp->b_addr; + be32_add_cpu(&agf->agf_length, len); + ASSERT(agf->agf_length == agi->agi_length); + xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH); + + /* + * Free the new space. + * + * XFS_RMAP_OINFO_SKIP_UPDATE is used here to tell the rmap btree that + * this doesn't actually exist in the rmap btree. + */ + error = xfs_rmap_free(tp, bp, id->agno, + be32_to_cpu(agf->agf_length) - len, + len, &XFS_RMAP_OINFO_SKIP_UPDATE); + if (error) + return error; + + return xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, id->agno, + be32_to_cpu(agf->agf_length) - len), + len, &XFS_RMAP_OINFO_SKIP_UPDATE, + XFS_AG_RESV_NONE); +} + +/* Retrieve AG geometry. */ +int +xfs_ag_get_geometry( + struct xfs_mount *mp, + xfs_agnumber_t agno, + struct xfs_ag_geometry *ageo) +{ + struct xfs_buf *agi_bp; + struct xfs_buf *agf_bp; + struct xfs_agi *agi; + struct xfs_agf *agf; + struct xfs_perag *pag; + unsigned int freeblks; + int error; + + if (agno >= mp->m_sb.sb_agcount) + return -EINVAL; + + /* Lock the AG headers. */ + error = xfs_ialloc_read_agi(mp, NULL, agno, &agi_bp); + if (error) + return error; + error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agf_bp); + if (error) + goto out_agi; + + pag = agi_bp->b_pag; + + /* Fill out form. */ + memset(ageo, 0, sizeof(*ageo)); + ageo->ag_number = agno; + + agi = agi_bp->b_addr; + ageo->ag_icount = be32_to_cpu(agi->agi_count); + ageo->ag_ifree = be32_to_cpu(agi->agi_freecount); + + agf = agf_bp->b_addr; + ageo->ag_length = be32_to_cpu(agf->agf_length); + freeblks = pag->pagf_freeblks + + pag->pagf_flcount + + pag->pagf_btreeblks - + xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE); + ageo->ag_freeblks = freeblks; + xfs_ag_geom_health(pag, ageo); + + /* Release resources. */ + xfs_buf_relse(agf_bp); +out_agi: + xfs_buf_relse(agi_bp); + return error; +} |