diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/xfs/xfs_bmap_btree.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/xfs/xfs_bmap_btree.c | 821 |
1 files changed, 821 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/fs/xfs/xfs_bmap_btree.c b/ANDROID_3.4.5/fs/xfs/xfs_bmap_btree.c new file mode 100644 index 00000000..e2f5d59c --- /dev/null +++ b/ANDROID_3.4.5/fs/xfs/xfs_bmap_btree.c @@ -0,0 +1,821 @@ +/* + * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. + * 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_types.h" +#include "xfs_bit.h" +#include "xfs_log.h" +#include "xfs_inum.h" +#include "xfs_trans.h" +#include "xfs_sb.h" +#include "xfs_ag.h" +#include "xfs_mount.h" +#include "xfs_bmap_btree.h" +#include "xfs_alloc_btree.h" +#include "xfs_ialloc_btree.h" +#include "xfs_dinode.h" +#include "xfs_inode.h" +#include "xfs_inode_item.h" +#include "xfs_alloc.h" +#include "xfs_btree.h" +#include "xfs_itable.h" +#include "xfs_bmap.h" +#include "xfs_error.h" +#include "xfs_quota.h" + +/* + * Determine the extent state. + */ +/* ARGSUSED */ +STATIC xfs_exntst_t +xfs_extent_state( + xfs_filblks_t blks, + int extent_flag) +{ + if (extent_flag) { + ASSERT(blks != 0); /* saved for DMIG */ + return XFS_EXT_UNWRITTEN; + } + return XFS_EXT_NORM; +} + +/* + * Convert on-disk form of btree root to in-memory form. + */ +void +xfs_bmdr_to_bmbt( + struct xfs_mount *mp, + xfs_bmdr_block_t *dblock, + int dblocklen, + struct xfs_btree_block *rblock, + int rblocklen) +{ + int dmxr; + xfs_bmbt_key_t *fkp; + __be64 *fpp; + xfs_bmbt_key_t *tkp; + __be64 *tpp; + + rblock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC); + rblock->bb_level = dblock->bb_level; + ASSERT(be16_to_cpu(rblock->bb_level) > 0); + rblock->bb_numrecs = dblock->bb_numrecs; + rblock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO); + rblock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO); + dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0); + fkp = XFS_BMDR_KEY_ADDR(dblock, 1); + tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1); + fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr); + tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen); + dmxr = be16_to_cpu(dblock->bb_numrecs); + memcpy(tkp, fkp, sizeof(*fkp) * dmxr); + memcpy(tpp, fpp, sizeof(*fpp) * dmxr); +} + +/* + * Convert a compressed bmap extent record to an uncompressed form. + * This code must be in sync with the routines xfs_bmbt_get_startoff, + * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state. + */ +STATIC void +__xfs_bmbt_get_all( + __uint64_t l0, + __uint64_t l1, + xfs_bmbt_irec_t *s) +{ + int ext_flag; + xfs_exntst_t st; + + ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN)); + s->br_startoff = ((xfs_fileoff_t)l0 & + xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9; +#if XFS_BIG_BLKNOS + s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) | + (((xfs_fsblock_t)l1) >> 21); +#else +#ifdef DEBUG + { + xfs_dfsbno_t b; + + b = (((xfs_dfsbno_t)l0 & xfs_mask64lo(9)) << 43) | + (((xfs_dfsbno_t)l1) >> 21); + ASSERT((b >> 32) == 0 || isnulldstartblock(b)); + s->br_startblock = (xfs_fsblock_t)b; + } +#else /* !DEBUG */ + s->br_startblock = (xfs_fsblock_t)(((xfs_dfsbno_t)l1) >> 21); +#endif /* DEBUG */ +#endif /* XFS_BIG_BLKNOS */ + s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21)); + /* This is xfs_extent_state() in-line */ + if (ext_flag) { + ASSERT(s->br_blockcount != 0); /* saved for DMIG */ + st = XFS_EXT_UNWRITTEN; + } else + st = XFS_EXT_NORM; + s->br_state = st; +} + +void +xfs_bmbt_get_all( + xfs_bmbt_rec_host_t *r, + xfs_bmbt_irec_t *s) +{ + __xfs_bmbt_get_all(r->l0, r->l1, s); +} + +/* + * Extract the blockcount field from an in memory bmap extent record. + */ +xfs_filblks_t +xfs_bmbt_get_blockcount( + xfs_bmbt_rec_host_t *r) +{ + return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21)); +} + +/* + * Extract the startblock field from an in memory bmap extent record. + */ +xfs_fsblock_t +xfs_bmbt_get_startblock( + xfs_bmbt_rec_host_t *r) +{ +#if XFS_BIG_BLKNOS + return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) | + (((xfs_fsblock_t)r->l1) >> 21); +#else +#ifdef DEBUG + xfs_dfsbno_t b; + + b = (((xfs_dfsbno_t)r->l0 & xfs_mask64lo(9)) << 43) | + (((xfs_dfsbno_t)r->l1) >> 21); + ASSERT((b >> 32) == 0 || isnulldstartblock(b)); + return (xfs_fsblock_t)b; +#else /* !DEBUG */ + return (xfs_fsblock_t)(((xfs_dfsbno_t)r->l1) >> 21); +#endif /* DEBUG */ +#endif /* XFS_BIG_BLKNOS */ +} + +/* + * Extract the startoff field from an in memory bmap extent record. + */ +xfs_fileoff_t +xfs_bmbt_get_startoff( + xfs_bmbt_rec_host_t *r) +{ + return ((xfs_fileoff_t)r->l0 & + xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9; +} + +xfs_exntst_t +xfs_bmbt_get_state( + xfs_bmbt_rec_host_t *r) +{ + int ext_flag; + + ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN)); + return xfs_extent_state(xfs_bmbt_get_blockcount(r), + ext_flag); +} + +/* + * Extract the blockcount field from an on disk bmap extent record. + */ +xfs_filblks_t +xfs_bmbt_disk_get_blockcount( + xfs_bmbt_rec_t *r) +{ + return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21)); +} + +/* + * Extract the startoff field from a disk format bmap extent record. + */ +xfs_fileoff_t +xfs_bmbt_disk_get_startoff( + xfs_bmbt_rec_t *r) +{ + return ((xfs_fileoff_t)be64_to_cpu(r->l0) & + xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9; +} + + +/* + * Set all the fields in a bmap extent record from the arguments. + */ +void +xfs_bmbt_set_allf( + xfs_bmbt_rec_host_t *r, + xfs_fileoff_t startoff, + xfs_fsblock_t startblock, + xfs_filblks_t blockcount, + xfs_exntst_t state) +{ + int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1; + + ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN); + ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0); + ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0); + +#if XFS_BIG_BLKNOS + ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0); + + r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) | + ((xfs_bmbt_rec_base_t)startoff << 9) | + ((xfs_bmbt_rec_base_t)startblock >> 43); + r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) | + ((xfs_bmbt_rec_base_t)blockcount & + (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); +#else /* !XFS_BIG_BLKNOS */ + if (isnullstartblock(startblock)) { + r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) | + ((xfs_bmbt_rec_base_t)startoff << 9) | + (xfs_bmbt_rec_base_t)xfs_mask64lo(9); + r->l1 = xfs_mask64hi(11) | + ((xfs_bmbt_rec_base_t)startblock << 21) | + ((xfs_bmbt_rec_base_t)blockcount & + (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); + } else { + r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) | + ((xfs_bmbt_rec_base_t)startoff << 9); + r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) | + ((xfs_bmbt_rec_base_t)blockcount & + (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); + } +#endif /* XFS_BIG_BLKNOS */ +} + +/* + * Set all the fields in a bmap extent record from the uncompressed form. + */ +void +xfs_bmbt_set_all( + xfs_bmbt_rec_host_t *r, + xfs_bmbt_irec_t *s) +{ + xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock, + s->br_blockcount, s->br_state); +} + + +/* + * Set all the fields in a disk format bmap extent record from the arguments. + */ +void +xfs_bmbt_disk_set_allf( + xfs_bmbt_rec_t *r, + xfs_fileoff_t startoff, + xfs_fsblock_t startblock, + xfs_filblks_t blockcount, + xfs_exntst_t state) +{ + int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1; + + ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN); + ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0); + ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0); + +#if XFS_BIG_BLKNOS + ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0); + + r->l0 = cpu_to_be64( + ((xfs_bmbt_rec_base_t)extent_flag << 63) | + ((xfs_bmbt_rec_base_t)startoff << 9) | + ((xfs_bmbt_rec_base_t)startblock >> 43)); + r->l1 = cpu_to_be64( + ((xfs_bmbt_rec_base_t)startblock << 21) | + ((xfs_bmbt_rec_base_t)blockcount & + (xfs_bmbt_rec_base_t)xfs_mask64lo(21))); +#else /* !XFS_BIG_BLKNOS */ + if (isnullstartblock(startblock)) { + r->l0 = cpu_to_be64( + ((xfs_bmbt_rec_base_t)extent_flag << 63) | + ((xfs_bmbt_rec_base_t)startoff << 9) | + (xfs_bmbt_rec_base_t)xfs_mask64lo(9)); + r->l1 = cpu_to_be64(xfs_mask64hi(11) | + ((xfs_bmbt_rec_base_t)startblock << 21) | + ((xfs_bmbt_rec_base_t)blockcount & + (xfs_bmbt_rec_base_t)xfs_mask64lo(21))); + } else { + r->l0 = cpu_to_be64( + ((xfs_bmbt_rec_base_t)extent_flag << 63) | + ((xfs_bmbt_rec_base_t)startoff << 9)); + r->l1 = cpu_to_be64( + ((xfs_bmbt_rec_base_t)startblock << 21) | + ((xfs_bmbt_rec_base_t)blockcount & + (xfs_bmbt_rec_base_t)xfs_mask64lo(21))); + } +#endif /* XFS_BIG_BLKNOS */ +} + +/* + * Set all the fields in a bmap extent record from the uncompressed form. + */ +STATIC void +xfs_bmbt_disk_set_all( + xfs_bmbt_rec_t *r, + xfs_bmbt_irec_t *s) +{ + xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock, + s->br_blockcount, s->br_state); +} + +/* + * Set the blockcount field in a bmap extent record. + */ +void +xfs_bmbt_set_blockcount( + xfs_bmbt_rec_host_t *r, + xfs_filblks_t v) +{ + ASSERT((v & xfs_mask64hi(43)) == 0); + r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) | + (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21)); +} + +/* + * Set the startblock field in a bmap extent record. + */ +void +xfs_bmbt_set_startblock( + xfs_bmbt_rec_host_t *r, + xfs_fsblock_t v) +{ +#if XFS_BIG_BLKNOS + ASSERT((v & xfs_mask64hi(12)) == 0); + r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) | + (xfs_bmbt_rec_base_t)(v >> 43); + r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) | + (xfs_bmbt_rec_base_t)(v << 21); +#else /* !XFS_BIG_BLKNOS */ + if (isnullstartblock(v)) { + r->l0 |= (xfs_bmbt_rec_base_t)xfs_mask64lo(9); + r->l1 = (xfs_bmbt_rec_base_t)xfs_mask64hi(11) | + ((xfs_bmbt_rec_base_t)v << 21) | + (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); + } else { + r->l0 &= ~(xfs_bmbt_rec_base_t)xfs_mask64lo(9); + r->l1 = ((xfs_bmbt_rec_base_t)v << 21) | + (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); + } +#endif /* XFS_BIG_BLKNOS */ +} + +/* + * Set the startoff field in a bmap extent record. + */ +void +xfs_bmbt_set_startoff( + xfs_bmbt_rec_host_t *r, + xfs_fileoff_t v) +{ + ASSERT((v & xfs_mask64hi(9)) == 0); + r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) | + ((xfs_bmbt_rec_base_t)v << 9) | + (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9)); +} + +/* + * Set the extent state field in a bmap extent record. + */ +void +xfs_bmbt_set_state( + xfs_bmbt_rec_host_t *r, + xfs_exntst_t v) +{ + ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN); + if (v == XFS_EXT_NORM) + r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN); + else + r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN); +} + +/* + * Convert in-memory form of btree root to on-disk form. + */ +void +xfs_bmbt_to_bmdr( + struct xfs_mount *mp, + struct xfs_btree_block *rblock, + int rblocklen, + xfs_bmdr_block_t *dblock, + int dblocklen) +{ + int dmxr; + xfs_bmbt_key_t *fkp; + __be64 *fpp; + xfs_bmbt_key_t *tkp; + __be64 *tpp; + + ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC)); + ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLDFSBNO)); + ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLDFSBNO)); + ASSERT(rblock->bb_level != 0); + dblock->bb_level = rblock->bb_level; + dblock->bb_numrecs = rblock->bb_numrecs; + dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0); + fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1); + tkp = XFS_BMDR_KEY_ADDR(dblock, 1); + fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen); + tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr); + dmxr = be16_to_cpu(dblock->bb_numrecs); + memcpy(tkp, fkp, sizeof(*fkp) * dmxr); + memcpy(tpp, fpp, sizeof(*fpp) * dmxr); +} + +/* + * Check extent records, which have just been read, for + * any bit in the extent flag field. ASSERT on debug + * kernels, as this condition should not occur. + * Return an error condition (1) if any flags found, + * otherwise return 0. + */ + +int +xfs_check_nostate_extents( + xfs_ifork_t *ifp, + xfs_extnum_t idx, + xfs_extnum_t num) +{ + for (; num > 0; num--, idx++) { + xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx); + if ((ep->l0 >> + (64 - BMBT_EXNTFLAG_BITLEN)) != 0) { + ASSERT(0); + return 1; + } + } + return 0; +} + + +STATIC struct xfs_btree_cur * +xfs_bmbt_dup_cursor( + struct xfs_btree_cur *cur) +{ + struct xfs_btree_cur *new; + + new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp, + cur->bc_private.b.ip, cur->bc_private.b.whichfork); + + /* + * Copy the firstblock, flist, and flags values, + * since init cursor doesn't get them. + */ + new->bc_private.b.firstblock = cur->bc_private.b.firstblock; + new->bc_private.b.flist = cur->bc_private.b.flist; + new->bc_private.b.flags = cur->bc_private.b.flags; + + return new; +} + +STATIC void +xfs_bmbt_update_cursor( + struct xfs_btree_cur *src, + struct xfs_btree_cur *dst) +{ + ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) || + (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME)); + ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist); + + dst->bc_private.b.allocated += src->bc_private.b.allocated; + dst->bc_private.b.firstblock = src->bc_private.b.firstblock; + + src->bc_private.b.allocated = 0; +} + +STATIC int +xfs_bmbt_alloc_block( + struct xfs_btree_cur *cur, + union xfs_btree_ptr *start, + union xfs_btree_ptr *new, + int length, + int *stat) +{ + xfs_alloc_arg_t args; /* block allocation args */ + int error; /* error return value */ + + memset(&args, 0, sizeof(args)); + args.tp = cur->bc_tp; + args.mp = cur->bc_mp; + args.fsbno = cur->bc_private.b.firstblock; + args.firstblock = args.fsbno; + + if (args.fsbno == NULLFSBLOCK) { + args.fsbno = be64_to_cpu(start->l); + args.type = XFS_ALLOCTYPE_START_BNO; + /* + * Make sure there is sufficient room left in the AG to + * complete a full tree split for an extent insert. If + * we are converting the middle part of an extent then + * we may need space for two tree splits. + * + * We are relying on the caller to make the correct block + * reservation for this operation to succeed. If the + * reservation amount is insufficient then we may fail a + * block allocation here and corrupt the filesystem. + */ + args.minleft = xfs_trans_get_block_res(args.tp); + } else if (cur->bc_private.b.flist->xbf_low) { + args.type = XFS_ALLOCTYPE_START_BNO; + } else { + args.type = XFS_ALLOCTYPE_NEAR_BNO; + } + + args.minlen = args.maxlen = args.prod = 1; + args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL; + if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) { + error = XFS_ERROR(ENOSPC); + goto error0; + } + error = xfs_alloc_vextent(&args); + if (error) + goto error0; + + if (args.fsbno == NULLFSBLOCK && args.minleft) { + /* + * Could not find an AG with enough free space to satisfy + * a full btree split. Try again without minleft and if + * successful activate the lowspace algorithm. + */ + args.fsbno = 0; + args.type = XFS_ALLOCTYPE_FIRST_AG; + args.minleft = 0; + error = xfs_alloc_vextent(&args); + if (error) + goto error0; + cur->bc_private.b.flist->xbf_low = 1; + } + if (args.fsbno == NULLFSBLOCK) { + XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); + *stat = 0; + return 0; + } + ASSERT(args.len == 1); + cur->bc_private.b.firstblock = args.fsbno; + cur->bc_private.b.allocated++; + cur->bc_private.b.ip->i_d.di_nblocks++; + xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE); + xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip, + XFS_TRANS_DQ_BCOUNT, 1L); + + new->l = cpu_to_be64(args.fsbno); + + XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); + *stat = 1; + return 0; + + error0: + XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR); + return error; +} + +STATIC int +xfs_bmbt_free_block( + struct xfs_btree_cur *cur, + struct xfs_buf *bp) +{ + struct xfs_mount *mp = cur->bc_mp; + struct xfs_inode *ip = cur->bc_private.b.ip; + struct xfs_trans *tp = cur->bc_tp; + xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp)); + + xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp); + ip->i_d.di_nblocks--; + + xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); + xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L); + xfs_trans_binval(tp, bp); + return 0; +} + +STATIC int +xfs_bmbt_get_minrecs( + struct xfs_btree_cur *cur, + int level) +{ + if (level == cur->bc_nlevels - 1) { + struct xfs_ifork *ifp; + + ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, + cur->bc_private.b.whichfork); + + return xfs_bmbt_maxrecs(cur->bc_mp, + ifp->if_broot_bytes, level == 0) / 2; + } + + return cur->bc_mp->m_bmap_dmnr[level != 0]; +} + +int +xfs_bmbt_get_maxrecs( + struct xfs_btree_cur *cur, + int level) +{ + if (level == cur->bc_nlevels - 1) { + struct xfs_ifork *ifp; + + ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, + cur->bc_private.b.whichfork); + + return xfs_bmbt_maxrecs(cur->bc_mp, + ifp->if_broot_bytes, level == 0); + } + + return cur->bc_mp->m_bmap_dmxr[level != 0]; + +} + +/* + * Get the maximum records we could store in the on-disk format. + * + * For non-root nodes this is equivalent to xfs_bmbt_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_bmbt_get_maxrecs for the root node, too. + */ +STATIC int +xfs_bmbt_get_dmaxrecs( + struct xfs_btree_cur *cur, + int level) +{ + if (level != cur->bc_nlevels - 1) + return cur->bc_mp->m_bmap_dmxr[level != 0]; + return xfs_bmdr_maxrecs(cur->bc_mp, cur->bc_private.b.forksize, + level == 0); +} + +STATIC void +xfs_bmbt_init_key_from_rec( + union xfs_btree_key *key, + union xfs_btree_rec *rec) +{ + key->bmbt.br_startoff = + cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt)); +} + +STATIC void +xfs_bmbt_init_rec_from_key( + union xfs_btree_key *key, + union xfs_btree_rec *rec) +{ + ASSERT(key->bmbt.br_startoff != 0); + + xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff), + 0, 0, XFS_EXT_NORM); +} + +STATIC void +xfs_bmbt_init_rec_from_cur( + struct xfs_btree_cur *cur, + union xfs_btree_rec *rec) +{ + xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b); +} + +STATIC void +xfs_bmbt_init_ptr_from_cur( + struct xfs_btree_cur *cur, + union xfs_btree_ptr *ptr) +{ + ptr->l = 0; +} + +STATIC __int64_t +xfs_bmbt_key_diff( + struct xfs_btree_cur *cur, + union xfs_btree_key *key) +{ + return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) - + cur->bc_rec.b.br_startoff; +} + +#ifdef DEBUG +STATIC int +xfs_bmbt_keys_inorder( + struct xfs_btree_cur *cur, + union xfs_btree_key *k1, + union xfs_btree_key *k2) +{ + return be64_to_cpu(k1->bmbt.br_startoff) < + be64_to_cpu(k2->bmbt.br_startoff); +} + +STATIC int +xfs_bmbt_recs_inorder( + struct xfs_btree_cur *cur, + union xfs_btree_rec *r1, + union xfs_btree_rec *r2) +{ + return xfs_bmbt_disk_get_startoff(&r1->bmbt) + + xfs_bmbt_disk_get_blockcount(&r1->bmbt) <= + xfs_bmbt_disk_get_startoff(&r2->bmbt); +} +#endif /* DEBUG */ + +static const struct xfs_btree_ops xfs_bmbt_ops = { + .rec_len = sizeof(xfs_bmbt_rec_t), + .key_len = sizeof(xfs_bmbt_key_t), + + .dup_cursor = xfs_bmbt_dup_cursor, + .update_cursor = xfs_bmbt_update_cursor, + .alloc_block = xfs_bmbt_alloc_block, + .free_block = xfs_bmbt_free_block, + .get_maxrecs = xfs_bmbt_get_maxrecs, + .get_minrecs = xfs_bmbt_get_minrecs, + .get_dmaxrecs = xfs_bmbt_get_dmaxrecs, + .init_key_from_rec = xfs_bmbt_init_key_from_rec, + .init_rec_from_key = xfs_bmbt_init_rec_from_key, + .init_rec_from_cur = xfs_bmbt_init_rec_from_cur, + .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur, + .key_diff = xfs_bmbt_key_diff, +#ifdef DEBUG + .keys_inorder = xfs_bmbt_keys_inorder, + .recs_inorder = xfs_bmbt_recs_inorder, +#endif +}; + +/* + * Allocate a new bmap btree cursor. + */ +struct xfs_btree_cur * /* new bmap btree cursor */ +xfs_bmbt_init_cursor( + struct xfs_mount *mp, /* file system mount point */ + struct xfs_trans *tp, /* transaction pointer */ + struct xfs_inode *ip, /* inode owning the btree */ + int whichfork) /* data or attr fork */ +{ + struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); + struct xfs_btree_cur *cur; + + cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP); + + cur->bc_tp = tp; + cur->bc_mp = mp; + cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1; + cur->bc_btnum = XFS_BTNUM_BMAP; + cur->bc_blocklog = mp->m_sb.sb_blocklog; + + cur->bc_ops = &xfs_bmbt_ops; + cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE; + + cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork); + cur->bc_private.b.ip = ip; + cur->bc_private.b.firstblock = NULLFSBLOCK; + cur->bc_private.b.flist = NULL; + cur->bc_private.b.allocated = 0; + cur->bc_private.b.flags = 0; + cur->bc_private.b.whichfork = whichfork; + + return cur; +} + +/* + * Calculate number of records in a bmap btree block. + */ +int +xfs_bmbt_maxrecs( + struct xfs_mount *mp, + int blocklen, + int leaf) +{ + blocklen -= XFS_BMBT_BLOCK_LEN(mp); + + if (leaf) + return blocklen / sizeof(xfs_bmbt_rec_t); + return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t)); +} + +/* + * Calculate number of records in a bmap btree inode root. + */ +int +xfs_bmdr_maxrecs( + struct xfs_mount *mp, + int blocklen, + int leaf) +{ + blocklen -= sizeof(xfs_bmdr_block_t); + + if (leaf) + return blocklen / sizeof(xfs_bmdr_rec_t); + return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t)); +} |