mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
014c2544e6
This patch removes pointless parentheses from return statements. Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2213 lines
65 KiB
C
2213 lines
65 KiB
C
/*
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* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_types.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_dir.h"
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#include "xfs_dir2.h"
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#include "xfs_dmapi.h"
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#include "xfs_mount.h"
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#include "xfs_da_btree.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_dir_sf.h"
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#include "xfs_dir2_sf.h"
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#include "xfs_attr_sf.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_inode_item.h"
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#include "xfs_alloc.h"
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#include "xfs_btree.h"
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#include "xfs_bmap.h"
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#include "xfs_dir_leaf.h"
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#include "xfs_error.h"
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/*
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* xfs_dir_leaf.c
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*
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* Routines to implement leaf blocks of directories as Btrees of hashed names.
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*/
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/*========================================================================
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* Function prototypes for the kernel.
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*========================================================================*/
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/*
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* Routines used for growing the Btree.
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*/
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STATIC void xfs_dir_leaf_add_work(xfs_dabuf_t *leaf_buffer, xfs_da_args_t *args,
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int insertion_index,
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int freemap_index);
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STATIC int xfs_dir_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *leaf_buffer,
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int musthave, int justcheck);
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STATIC void xfs_dir_leaf_rebalance(xfs_da_state_t *state,
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xfs_da_state_blk_t *blk1,
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xfs_da_state_blk_t *blk2);
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STATIC int xfs_dir_leaf_figure_balance(xfs_da_state_t *state,
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xfs_da_state_blk_t *leaf_blk_1,
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xfs_da_state_blk_t *leaf_blk_2,
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int *number_entries_in_blk1,
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int *number_namebytes_in_blk1);
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STATIC int xfs_dir_leaf_create(struct xfs_da_args *args,
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xfs_dablk_t which_block,
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struct xfs_dabuf **bpp);
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/*
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* Utility routines.
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*/
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STATIC void xfs_dir_leaf_moveents(xfs_dir_leafblock_t *src_leaf,
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int src_start,
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xfs_dir_leafblock_t *dst_leaf,
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int dst_start, int move_count,
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xfs_mount_t *mp);
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/*========================================================================
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* External routines when dirsize < XFS_IFORK_DSIZE(dp).
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*========================================================================*/
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/*
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* Validate a given inode number.
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*/
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int
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xfs_dir_ino_validate(xfs_mount_t *mp, xfs_ino_t ino)
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{
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xfs_agblock_t agblkno;
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xfs_agino_t agino;
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xfs_agnumber_t agno;
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int ino_ok;
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int ioff;
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agno = XFS_INO_TO_AGNO(mp, ino);
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agblkno = XFS_INO_TO_AGBNO(mp, ino);
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ioff = XFS_INO_TO_OFFSET(mp, ino);
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agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
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ino_ok =
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agno < mp->m_sb.sb_agcount &&
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agblkno < mp->m_sb.sb_agblocks &&
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agblkno != 0 &&
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ioff < (1 << mp->m_sb.sb_inopblog) &&
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XFS_AGINO_TO_INO(mp, agno, agino) == ino;
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if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
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XFS_RANDOM_DIR_INO_VALIDATE))) {
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xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
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(unsigned long long) ino);
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XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
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return XFS_ERROR(EFSCORRUPTED);
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}
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return 0;
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}
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/*
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* Create the initial contents of a shortform directory.
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*/
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int
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xfs_dir_shortform_create(xfs_da_args_t *args, xfs_ino_t parent)
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{
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xfs_dir_sf_hdr_t *hdr;
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xfs_inode_t *dp;
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dp = args->dp;
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ASSERT(dp != NULL);
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ASSERT(dp->i_d.di_size == 0);
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if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
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dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */
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dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
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xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
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dp->i_df.if_flags |= XFS_IFINLINE;
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}
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ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
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ASSERT(dp->i_df.if_bytes == 0);
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xfs_idata_realloc(dp, sizeof(*hdr), XFS_DATA_FORK);
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hdr = (xfs_dir_sf_hdr_t *)dp->i_df.if_u1.if_data;
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XFS_DIR_SF_PUT_DIRINO(&parent, &hdr->parent);
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hdr->count = 0;
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dp->i_d.di_size = sizeof(*hdr);
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xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
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return 0;
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}
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/*
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* Add a name to the shortform directory structure.
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* Overflow from the inode has already been checked for.
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*/
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int
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xfs_dir_shortform_addname(xfs_da_args_t *args)
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{
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xfs_dir_shortform_t *sf;
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xfs_dir_sf_entry_t *sfe;
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int i, offset, size;
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xfs_inode_t *dp;
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dp = args->dp;
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ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
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/*
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* Catch the case where the conversion from shortform to leaf
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* failed part way through.
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*/
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if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
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ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
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return XFS_ERROR(EIO);
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}
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ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
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ASSERT(dp->i_df.if_u1.if_data != NULL);
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sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
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sfe = &sf->list[0];
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for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
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if (sfe->namelen == args->namelen &&
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args->name[0] == sfe->name[0] &&
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memcmp(args->name, sfe->name, args->namelen) == 0)
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return XFS_ERROR(EEXIST);
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sfe = XFS_DIR_SF_NEXTENTRY(sfe);
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}
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offset = (int)((char *)sfe - (char *)sf);
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size = XFS_DIR_SF_ENTSIZE_BYNAME(args->namelen);
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xfs_idata_realloc(dp, size, XFS_DATA_FORK);
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sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
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sfe = (xfs_dir_sf_entry_t *)((char *)sf + offset);
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XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sfe->inumber);
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sfe->namelen = args->namelen;
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memcpy(sfe->name, args->name, sfe->namelen);
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INT_MOD(sf->hdr.count, ARCH_CONVERT, +1);
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dp->i_d.di_size += size;
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xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
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return 0;
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}
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/*
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* Remove a name from the shortform directory structure.
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*/
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int
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xfs_dir_shortform_removename(xfs_da_args_t *args)
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{
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xfs_dir_shortform_t *sf;
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xfs_dir_sf_entry_t *sfe;
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int base, size = 0, i;
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xfs_inode_t *dp;
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dp = args->dp;
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ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
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/*
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* Catch the case where the conversion from shortform to leaf
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* failed part way through.
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*/
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if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
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ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
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return XFS_ERROR(EIO);
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}
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ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
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ASSERT(dp->i_df.if_u1.if_data != NULL);
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base = sizeof(xfs_dir_sf_hdr_t);
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sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
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sfe = &sf->list[0];
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for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
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size = XFS_DIR_SF_ENTSIZE_BYENTRY(sfe);
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if (sfe->namelen == args->namelen &&
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sfe->name[0] == args->name[0] &&
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memcmp(sfe->name, args->name, args->namelen) == 0)
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break;
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base += size;
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sfe = XFS_DIR_SF_NEXTENTRY(sfe);
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}
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if (i < 0) {
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ASSERT(args->oknoent);
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return XFS_ERROR(ENOENT);
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}
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if ((base + size) != dp->i_d.di_size) {
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memmove(&((char *)sf)[base], &((char *)sf)[base+size],
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dp->i_d.di_size - (base+size));
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}
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INT_MOD(sf->hdr.count, ARCH_CONVERT, -1);
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xfs_idata_realloc(dp, -size, XFS_DATA_FORK);
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dp->i_d.di_size -= size;
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xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
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return 0;
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}
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/*
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* Look up a name in a shortform directory structure.
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*/
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int
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xfs_dir_shortform_lookup(xfs_da_args_t *args)
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{
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xfs_dir_shortform_t *sf;
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xfs_dir_sf_entry_t *sfe;
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int i;
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xfs_inode_t *dp;
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dp = args->dp;
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ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
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/*
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* Catch the case where the conversion from shortform to leaf
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* failed part way through.
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*/
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if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
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ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
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return XFS_ERROR(EIO);
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}
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ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
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ASSERT(dp->i_df.if_u1.if_data != NULL);
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sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
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if (args->namelen == 2 &&
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args->name[0] == '.' && args->name[1] == '.') {
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XFS_DIR_SF_GET_DIRINO(&sf->hdr.parent, &args->inumber);
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return(XFS_ERROR(EEXIST));
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}
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if (args->namelen == 1 && args->name[0] == '.') {
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args->inumber = dp->i_ino;
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return(XFS_ERROR(EEXIST));
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}
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sfe = &sf->list[0];
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for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
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if (sfe->namelen == args->namelen &&
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sfe->name[0] == args->name[0] &&
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memcmp(args->name, sfe->name, args->namelen) == 0) {
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XFS_DIR_SF_GET_DIRINO(&sfe->inumber, &args->inumber);
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return(XFS_ERROR(EEXIST));
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}
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sfe = XFS_DIR_SF_NEXTENTRY(sfe);
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}
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ASSERT(args->oknoent);
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return(XFS_ERROR(ENOENT));
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}
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/*
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* Convert from using the shortform to the leaf.
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*/
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int
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xfs_dir_shortform_to_leaf(xfs_da_args_t *iargs)
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{
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xfs_inode_t *dp;
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xfs_dir_shortform_t *sf;
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xfs_dir_sf_entry_t *sfe;
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xfs_da_args_t args;
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xfs_ino_t inumber;
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char *tmpbuffer;
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int retval, i, size;
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xfs_dablk_t blkno;
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xfs_dabuf_t *bp;
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dp = iargs->dp;
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/*
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* Catch the case where the conversion from shortform to leaf
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* failed part way through.
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*/
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if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
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ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
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return XFS_ERROR(EIO);
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}
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ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
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ASSERT(dp->i_df.if_u1.if_data != NULL);
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size = dp->i_df.if_bytes;
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tmpbuffer = kmem_alloc(size, KM_SLEEP);
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ASSERT(tmpbuffer != NULL);
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memcpy(tmpbuffer, dp->i_df.if_u1.if_data, size);
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sf = (xfs_dir_shortform_t *)tmpbuffer;
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XFS_DIR_SF_GET_DIRINO(&sf->hdr.parent, &inumber);
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xfs_idata_realloc(dp, -size, XFS_DATA_FORK);
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dp->i_d.di_size = 0;
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xfs_trans_log_inode(iargs->trans, dp, XFS_ILOG_CORE);
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retval = xfs_da_grow_inode(iargs, &blkno);
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if (retval)
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goto out;
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ASSERT(blkno == 0);
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retval = xfs_dir_leaf_create(iargs, blkno, &bp);
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if (retval)
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goto out;
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xfs_da_buf_done(bp);
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args.name = ".";
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args.namelen = 1;
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args.hashval = xfs_dir_hash_dot;
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args.inumber = dp->i_ino;
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args.dp = dp;
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args.firstblock = iargs->firstblock;
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args.flist = iargs->flist;
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args.total = iargs->total;
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args.whichfork = XFS_DATA_FORK;
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args.trans = iargs->trans;
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args.justcheck = 0;
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args.addname = args.oknoent = 1;
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retval = xfs_dir_leaf_addname(&args);
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if (retval)
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goto out;
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args.name = "..";
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args.namelen = 2;
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args.hashval = xfs_dir_hash_dotdot;
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args.inumber = inumber;
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retval = xfs_dir_leaf_addname(&args);
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if (retval)
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goto out;
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sfe = &sf->list[0];
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for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
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args.name = (char *)(sfe->name);
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args.namelen = sfe->namelen;
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args.hashval = xfs_da_hashname((char *)(sfe->name),
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sfe->namelen);
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XFS_DIR_SF_GET_DIRINO(&sfe->inumber, &args.inumber);
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retval = xfs_dir_leaf_addname(&args);
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if (retval)
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goto out;
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sfe = XFS_DIR_SF_NEXTENTRY(sfe);
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}
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retval = 0;
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out:
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kmem_free(tmpbuffer, size);
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return retval;
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}
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|
|
STATIC int
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xfs_dir_shortform_compare(const void *a, const void *b)
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{
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xfs_dir_sf_sort_t *sa, *sb;
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sa = (xfs_dir_sf_sort_t *)a;
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sb = (xfs_dir_sf_sort_t *)b;
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if (sa->hash < sb->hash)
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return -1;
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else if (sa->hash > sb->hash)
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return 1;
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else
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return sa->entno - sb->entno;
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}
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|
|
/*
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|
* Copy out directory entries for getdents(), for shortform directories.
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|
*/
|
|
/*ARGSUSED*/
|
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int
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xfs_dir_shortform_getdents(xfs_inode_t *dp, uio_t *uio, int *eofp,
|
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xfs_dirent_t *dbp, xfs_dir_put_t put)
|
|
{
|
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xfs_dir_shortform_t *sf;
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xfs_dir_sf_entry_t *sfe;
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int retval, i, sbsize, nsbuf, lastresid=0, want_entno;
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xfs_mount_t *mp;
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xfs_dahash_t cookhash, hash;
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xfs_dir_put_args_t p;
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xfs_dir_sf_sort_t *sbuf, *sbp;
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mp = dp->i_mount;
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sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
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cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset);
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want_entno = XFS_DA_COOKIE_ENTRY(mp, uio->uio_offset);
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nsbuf = INT_GET(sf->hdr.count, ARCH_CONVERT) + 2;
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sbsize = (nsbuf + 1) * sizeof(*sbuf);
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sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP);
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|
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xfs_dir_trace_g_du("sf: start", dp, uio);
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|
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/*
|
|
* Collect all the entries into the buffer.
|
|
* Entry 0 is .
|
|
*/
|
|
sbp->entno = 0;
|
|
sbp->seqno = 0;
|
|
sbp->hash = xfs_dir_hash_dot;
|
|
sbp->ino = dp->i_ino;
|
|
sbp->name = ".";
|
|
sbp->namelen = 1;
|
|
sbp++;
|
|
|
|
/*
|
|
* Entry 1 is ..
|
|
*/
|
|
sbp->entno = 1;
|
|
sbp->seqno = 0;
|
|
sbp->hash = xfs_dir_hash_dotdot;
|
|
sbp->ino = XFS_GET_DIR_INO8(sf->hdr.parent);
|
|
sbp->name = "..";
|
|
sbp->namelen = 2;
|
|
sbp++;
|
|
|
|
/*
|
|
* Scan the directory data for the rest of the entries.
|
|
*/
|
|
for (i = 0, sfe = &sf->list[0];
|
|
i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
|
|
|
|
if (unlikely(
|
|
((char *)sfe < (char *)sf) ||
|
|
((char *)sfe >= ((char *)sf + dp->i_df.if_bytes)))) {
|
|
xfs_dir_trace_g_du("sf: corrupted", dp, uio);
|
|
XFS_CORRUPTION_ERROR("xfs_dir_shortform_getdents",
|
|
XFS_ERRLEVEL_LOW, mp, sfe);
|
|
kmem_free(sbuf, sbsize);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
|
|
sbp->entno = i + 2;
|
|
sbp->seqno = 0;
|
|
sbp->hash = xfs_da_hashname((char *)sfe->name, sfe->namelen);
|
|
sbp->ino = XFS_GET_DIR_INO8(sfe->inumber);
|
|
sbp->name = (char *)sfe->name;
|
|
sbp->namelen = sfe->namelen;
|
|
sfe = XFS_DIR_SF_NEXTENTRY(sfe);
|
|
sbp++;
|
|
}
|
|
|
|
/*
|
|
* Sort the entries on hash then entno.
|
|
*/
|
|
xfs_sort(sbuf, nsbuf, sizeof(*sbuf), xfs_dir_shortform_compare);
|
|
/*
|
|
* Stuff in last entry.
|
|
*/
|
|
sbp->entno = nsbuf;
|
|
sbp->hash = XFS_DA_MAXHASH;
|
|
sbp->seqno = 0;
|
|
/*
|
|
* Figure out the sequence numbers in case there's a hash duplicate.
|
|
*/
|
|
for (hash = sbuf->hash, sbp = sbuf + 1;
|
|
sbp < &sbuf[nsbuf + 1]; sbp++) {
|
|
if (sbp->hash == hash)
|
|
sbp->seqno = sbp[-1].seqno + 1;
|
|
else
|
|
hash = sbp->hash;
|
|
}
|
|
|
|
/*
|
|
* Set up put routine.
|
|
*/
|
|
p.dbp = dbp;
|
|
p.put = put;
|
|
p.uio = uio;
|
|
|
|
/*
|
|
* Find our place.
|
|
*/
|
|
for (sbp = sbuf; sbp < &sbuf[nsbuf + 1]; sbp++) {
|
|
if (sbp->hash > cookhash ||
|
|
(sbp->hash == cookhash && sbp->seqno >= want_entno))
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Did we fail to find anything? We stop at the last entry,
|
|
* the one we put maxhash into.
|
|
*/
|
|
if (sbp == &sbuf[nsbuf]) {
|
|
kmem_free(sbuf, sbsize);
|
|
xfs_dir_trace_g_du("sf: hash beyond end", dp, uio);
|
|
uio->uio_offset = XFS_DA_MAKE_COOKIE(mp, 0, 0, XFS_DA_MAXHASH);
|
|
*eofp = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Loop putting entries into the user buffer.
|
|
*/
|
|
while (sbp < &sbuf[nsbuf]) {
|
|
/*
|
|
* Save the first resid in a run of equal-hashval entries
|
|
* so that we can back them out if they don't all fit.
|
|
*/
|
|
if (sbp->seqno == 0 || sbp == sbuf)
|
|
lastresid = uio->uio_resid;
|
|
XFS_PUT_COOKIE(p.cook, mp, 0, sbp[1].seqno, sbp[1].hash);
|
|
p.ino = sbp->ino;
|
|
#if XFS_BIG_INUMS
|
|
p.ino += mp->m_inoadd;
|
|
#endif
|
|
p.name = sbp->name;
|
|
p.namelen = sbp->namelen;
|
|
retval = p.put(&p);
|
|
if (!p.done) {
|
|
uio->uio_offset =
|
|
XFS_DA_MAKE_COOKIE(mp, 0, 0, sbp->hash);
|
|
kmem_free(sbuf, sbsize);
|
|
uio->uio_resid = lastresid;
|
|
xfs_dir_trace_g_du("sf: E-O-B", dp, uio);
|
|
return retval;
|
|
}
|
|
sbp++;
|
|
}
|
|
kmem_free(sbuf, sbsize);
|
|
uio->uio_offset = p.cook.o;
|
|
*eofp = 1;
|
|
xfs_dir_trace_g_du("sf: E-O-F", dp, uio);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Look up a name in a shortform directory structure, replace the inode number.
|
|
*/
|
|
int
|
|
xfs_dir_shortform_replace(xfs_da_args_t *args)
|
|
{
|
|
xfs_dir_shortform_t *sf;
|
|
xfs_dir_sf_entry_t *sfe;
|
|
xfs_inode_t *dp;
|
|
int i;
|
|
|
|
dp = args->dp;
|
|
ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
|
|
/*
|
|
* Catch the case where the conversion from shortform to leaf
|
|
* failed part way through.
|
|
*/
|
|
if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
|
|
ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
|
|
return XFS_ERROR(EIO);
|
|
}
|
|
ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
|
|
ASSERT(dp->i_df.if_u1.if_data != NULL);
|
|
sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
|
|
if (args->namelen == 2 &&
|
|
args->name[0] == '.' && args->name[1] == '.') {
|
|
/* XXX - replace assert? */
|
|
XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sf->hdr.parent);
|
|
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
|
|
return 0;
|
|
}
|
|
ASSERT(args->namelen != 1 || args->name[0] != '.');
|
|
sfe = &sf->list[0];
|
|
for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
|
|
if (sfe->namelen == args->namelen &&
|
|
sfe->name[0] == args->name[0] &&
|
|
memcmp(args->name, sfe->name, args->namelen) == 0) {
|
|
ASSERT(memcmp((char *)&args->inumber,
|
|
(char *)&sfe->inumber, sizeof(xfs_ino_t)));
|
|
XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sfe->inumber);
|
|
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
|
|
return 0;
|
|
}
|
|
sfe = XFS_DIR_SF_NEXTENTRY(sfe);
|
|
}
|
|
ASSERT(args->oknoent);
|
|
return XFS_ERROR(ENOENT);
|
|
}
|
|
|
|
/*
|
|
* Convert a leaf directory to shortform structure
|
|
*/
|
|
int
|
|
xfs_dir_leaf_to_shortform(xfs_da_args_t *iargs)
|
|
{
|
|
xfs_dir_leafblock_t *leaf;
|
|
xfs_dir_leaf_hdr_t *hdr;
|
|
xfs_dir_leaf_entry_t *entry;
|
|
xfs_dir_leaf_name_t *namest;
|
|
xfs_da_args_t args;
|
|
xfs_inode_t *dp;
|
|
xfs_ino_t parent = 0;
|
|
char *tmpbuffer;
|
|
int retval, i;
|
|
xfs_dabuf_t *bp;
|
|
|
|
dp = iargs->dp;
|
|
tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP);
|
|
ASSERT(tmpbuffer != NULL);
|
|
|
|
retval = xfs_da_read_buf(iargs->trans, iargs->dp, 0, -1, &bp,
|
|
XFS_DATA_FORK);
|
|
if (retval)
|
|
goto out;
|
|
ASSERT(bp != NULL);
|
|
memcpy(tmpbuffer, bp->data, XFS_LBSIZE(dp->i_mount));
|
|
leaf = (xfs_dir_leafblock_t *)tmpbuffer;
|
|
ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
memset(bp->data, 0, XFS_LBSIZE(dp->i_mount));
|
|
|
|
/*
|
|
* Find and special case the parent inode number
|
|
*/
|
|
hdr = &leaf->hdr;
|
|
entry = &leaf->entries[0];
|
|
for (i = INT_GET(hdr->count, ARCH_CONVERT)-1; i >= 0; entry++, i--) {
|
|
namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
|
|
if ((entry->namelen == 2) &&
|
|
(namest->name[0] == '.') &&
|
|
(namest->name[1] == '.')) {
|
|
XFS_DIR_SF_GET_DIRINO(&namest->inumber, &parent);
|
|
entry->nameidx = 0;
|
|
} else if ((entry->namelen == 1) && (namest->name[0] == '.')) {
|
|
entry->nameidx = 0;
|
|
}
|
|
}
|
|
retval = xfs_da_shrink_inode(iargs, 0, bp);
|
|
if (retval)
|
|
goto out;
|
|
retval = xfs_dir_shortform_create(iargs, parent);
|
|
if (retval)
|
|
goto out;
|
|
|
|
/*
|
|
* Copy the rest of the filenames
|
|
*/
|
|
entry = &leaf->entries[0];
|
|
args.dp = dp;
|
|
args.firstblock = iargs->firstblock;
|
|
args.flist = iargs->flist;
|
|
args.total = iargs->total;
|
|
args.whichfork = XFS_DATA_FORK;
|
|
args.trans = iargs->trans;
|
|
args.justcheck = 0;
|
|
args.addname = args.oknoent = 1;
|
|
for (i = 0; i < INT_GET(hdr->count, ARCH_CONVERT); entry++, i++) {
|
|
if (!entry->nameidx)
|
|
continue;
|
|
namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
|
|
args.name = (char *)(namest->name);
|
|
args.namelen = entry->namelen;
|
|
args.hashval = INT_GET(entry->hashval, ARCH_CONVERT);
|
|
XFS_DIR_SF_GET_DIRINO(&namest->inumber, &args.inumber);
|
|
xfs_dir_shortform_addname(&args);
|
|
}
|
|
|
|
out:
|
|
kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount));
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Convert from using a single leaf to a root node and a leaf.
|
|
*/
|
|
int
|
|
xfs_dir_leaf_to_node(xfs_da_args_t *args)
|
|
{
|
|
xfs_dir_leafblock_t *leaf;
|
|
xfs_da_intnode_t *node;
|
|
xfs_inode_t *dp;
|
|
xfs_dabuf_t *bp1, *bp2;
|
|
xfs_dablk_t blkno;
|
|
int retval;
|
|
|
|
dp = args->dp;
|
|
retval = xfs_da_grow_inode(args, &blkno);
|
|
ASSERT(blkno == 1);
|
|
if (retval)
|
|
return retval;
|
|
retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1,
|
|
XFS_DATA_FORK);
|
|
if (retval)
|
|
return retval;
|
|
ASSERT(bp1 != NULL);
|
|
retval = xfs_da_get_buf(args->trans, args->dp, 1, -1, &bp2,
|
|
XFS_DATA_FORK);
|
|
if (retval) {
|
|
xfs_da_buf_done(bp1);
|
|
return retval;
|
|
}
|
|
ASSERT(bp2 != NULL);
|
|
memcpy(bp2->data, bp1->data, XFS_LBSIZE(dp->i_mount));
|
|
xfs_da_buf_done(bp1);
|
|
xfs_da_log_buf(args->trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1);
|
|
|
|
/*
|
|
* Set up the new root node.
|
|
*/
|
|
retval = xfs_da_node_create(args, 0, 1, &bp1, XFS_DATA_FORK);
|
|
if (retval) {
|
|
xfs_da_buf_done(bp2);
|
|
return retval;
|
|
}
|
|
node = bp1->data;
|
|
leaf = bp2->data;
|
|
ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
INT_SET(node->btree[0].hashval, ARCH_CONVERT, INT_GET(leaf->entries[ INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT));
|
|
xfs_da_buf_done(bp2);
|
|
INT_SET(node->btree[0].before, ARCH_CONVERT, blkno);
|
|
INT_SET(node->hdr.count, ARCH_CONVERT, 1);
|
|
xfs_da_log_buf(args->trans, bp1,
|
|
XFS_DA_LOGRANGE(node, &node->btree[0], sizeof(node->btree[0])));
|
|
xfs_da_buf_done(bp1);
|
|
|
|
return retval;
|
|
}
|
|
|
|
|
|
/*========================================================================
|
|
* Routines used for growing the Btree.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Create the initial contents of a leaf directory
|
|
* or a leaf in a node directory.
|
|
*/
|
|
STATIC int
|
|
xfs_dir_leaf_create(xfs_da_args_t *args, xfs_dablk_t blkno, xfs_dabuf_t **bpp)
|
|
{
|
|
xfs_dir_leafblock_t *leaf;
|
|
xfs_dir_leaf_hdr_t *hdr;
|
|
xfs_inode_t *dp;
|
|
xfs_dabuf_t *bp;
|
|
int retval;
|
|
|
|
dp = args->dp;
|
|
ASSERT(dp != NULL);
|
|
retval = xfs_da_get_buf(args->trans, dp, blkno, -1, &bp, XFS_DATA_FORK);
|
|
if (retval)
|
|
return retval;
|
|
ASSERT(bp != NULL);
|
|
leaf = bp->data;
|
|
memset((char *)leaf, 0, XFS_LBSIZE(dp->i_mount));
|
|
hdr = &leaf->hdr;
|
|
INT_SET(hdr->info.magic, ARCH_CONVERT, XFS_DIR_LEAF_MAGIC);
|
|
INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount));
|
|
if (!hdr->firstused)
|
|
INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount) - 1);
|
|
INT_SET(hdr->freemap[0].base, ARCH_CONVERT, sizeof(xfs_dir_leaf_hdr_t));
|
|
INT_SET(hdr->freemap[0].size, ARCH_CONVERT, INT_GET(hdr->firstused, ARCH_CONVERT) - INT_GET(hdr->freemap[0].base, ARCH_CONVERT));
|
|
|
|
xfs_da_log_buf(args->trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1);
|
|
|
|
*bpp = bp;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Split the leaf node, rebalance, then add the new entry.
|
|
*/
|
|
int
|
|
xfs_dir_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
|
|
xfs_da_state_blk_t *newblk)
|
|
{
|
|
xfs_dablk_t blkno;
|
|
xfs_da_args_t *args;
|
|
int error;
|
|
|
|
/*
|
|
* Allocate space for a new leaf node.
|
|
*/
|
|
args = state->args;
|
|
ASSERT(args != NULL);
|
|
ASSERT(oldblk->magic == XFS_DIR_LEAF_MAGIC);
|
|
error = xfs_da_grow_inode(args, &blkno);
|
|
if (error)
|
|
return error;
|
|
error = xfs_dir_leaf_create(args, blkno, &newblk->bp);
|
|
if (error)
|
|
return error;
|
|
newblk->blkno = blkno;
|
|
newblk->magic = XFS_DIR_LEAF_MAGIC;
|
|
|
|
/*
|
|
* Rebalance the entries across the two leaves.
|
|
*/
|
|
xfs_dir_leaf_rebalance(state, oldblk, newblk);
|
|
error = xfs_da_blk_link(state, oldblk, newblk);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Insert the new entry in the correct block.
|
|
*/
|
|
if (state->inleaf) {
|
|
error = xfs_dir_leaf_add(oldblk->bp, args, oldblk->index);
|
|
} else {
|
|
error = xfs_dir_leaf_add(newblk->bp, args, newblk->index);
|
|
}
|
|
|
|
/*
|
|
* Update last hashval in each block since we added the name.
|
|
*/
|
|
oldblk->hashval = xfs_dir_leaf_lasthash(oldblk->bp, NULL);
|
|
newblk->hashval = xfs_dir_leaf_lasthash(newblk->bp, NULL);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Add a name to the leaf directory structure.
|
|
*
|
|
* Must take into account fragmented leaves and leaves where spacemap has
|
|
* lost some freespace information (ie: holes).
|
|
*/
|
|
int
|
|
xfs_dir_leaf_add(xfs_dabuf_t *bp, xfs_da_args_t *args, int index)
|
|
{
|
|
xfs_dir_leafblock_t *leaf;
|
|
xfs_dir_leaf_hdr_t *hdr;
|
|
xfs_dir_leaf_map_t *map;
|
|
int tablesize, entsize, sum, i, tmp, error;
|
|
|
|
leaf = bp->data;
|
|
ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
ASSERT((index >= 0) && (index <= INT_GET(leaf->hdr.count, ARCH_CONVERT)));
|
|
hdr = &leaf->hdr;
|
|
entsize = XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen);
|
|
|
|
/*
|
|
* Search through freemap for first-fit on new name length.
|
|
* (may need to figure in size of entry struct too)
|
|
*/
|
|
tablesize = (INT_GET(hdr->count, ARCH_CONVERT) + 1) * (uint)sizeof(xfs_dir_leaf_entry_t)
|
|
+ (uint)sizeof(xfs_dir_leaf_hdr_t);
|
|
map = &hdr->freemap[XFS_DIR_LEAF_MAPSIZE-1];
|
|
for (sum = 0, i = XFS_DIR_LEAF_MAPSIZE-1; i >= 0; map--, i--) {
|
|
if (tablesize > INT_GET(hdr->firstused, ARCH_CONVERT)) {
|
|
sum += INT_GET(map->size, ARCH_CONVERT);
|
|
continue;
|
|
}
|
|
if (!map->size)
|
|
continue; /* no space in this map */
|
|
tmp = entsize;
|
|
if (INT_GET(map->base, ARCH_CONVERT) < INT_GET(hdr->firstused, ARCH_CONVERT))
|
|
tmp += (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
if (INT_GET(map->size, ARCH_CONVERT) >= tmp) {
|
|
if (!args->justcheck)
|
|
xfs_dir_leaf_add_work(bp, args, index, i);
|
|
return 0;
|
|
}
|
|
sum += INT_GET(map->size, ARCH_CONVERT);
|
|
}
|
|
|
|
/*
|
|
* If there are no holes in the address space of the block,
|
|
* and we don't have enough freespace, then compaction will do us
|
|
* no good and we should just give up.
|
|
*/
|
|
if (!hdr->holes && (sum < entsize))
|
|
return XFS_ERROR(ENOSPC);
|
|
|
|
/*
|
|
* Compact the entries to coalesce free space.
|
|
* Pass the justcheck flag so the checking pass can return
|
|
* an error, without changing anything, if it won't fit.
|
|
*/
|
|
error = xfs_dir_leaf_compact(args->trans, bp,
|
|
args->total == 0 ?
|
|
entsize +
|
|
(uint)sizeof(xfs_dir_leaf_entry_t) : 0,
|
|
args->justcheck);
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* After compaction, the block is guaranteed to have only one
|
|
* free region, in freemap[0]. If it is not big enough, give up.
|
|
*/
|
|
if (INT_GET(hdr->freemap[0].size, ARCH_CONVERT) <
|
|
(entsize + (uint)sizeof(xfs_dir_leaf_entry_t)))
|
|
return XFS_ERROR(ENOSPC);
|
|
|
|
if (!args->justcheck)
|
|
xfs_dir_leaf_add_work(bp, args, index, 0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Add a name to a leaf directory structure.
|
|
*/
|
|
STATIC void
|
|
xfs_dir_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int index,
|
|
int mapindex)
|
|
{
|
|
xfs_dir_leafblock_t *leaf;
|
|
xfs_dir_leaf_hdr_t *hdr;
|
|
xfs_dir_leaf_entry_t *entry;
|
|
xfs_dir_leaf_name_t *namest;
|
|
xfs_dir_leaf_map_t *map;
|
|
/* REFERENCED */
|
|
xfs_mount_t *mp;
|
|
int tmp, i;
|
|
|
|
leaf = bp->data;
|
|
ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
hdr = &leaf->hdr;
|
|
ASSERT((mapindex >= 0) && (mapindex < XFS_DIR_LEAF_MAPSIZE));
|
|
ASSERT((index >= 0) && (index <= INT_GET(hdr->count, ARCH_CONVERT)));
|
|
|
|
/*
|
|
* Force open some space in the entry array and fill it in.
|
|
*/
|
|
entry = &leaf->entries[index];
|
|
if (index < INT_GET(hdr->count, ARCH_CONVERT)) {
|
|
tmp = INT_GET(hdr->count, ARCH_CONVERT) - index;
|
|
tmp *= (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
memmove(entry + 1, entry, tmp);
|
|
xfs_da_log_buf(args->trans, bp,
|
|
XFS_DA_LOGRANGE(leaf, entry, tmp + (uint)sizeof(*entry)));
|
|
}
|
|
INT_MOD(hdr->count, ARCH_CONVERT, +1);
|
|
|
|
/*
|
|
* Allocate space for the new string (at the end of the run).
|
|
*/
|
|
map = &hdr->freemap[mapindex];
|
|
mp = args->trans->t_mountp;
|
|
ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
|
|
ASSERT(INT_GET(map->size, ARCH_CONVERT) >= XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen));
|
|
ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
|
|
INT_MOD(map->size, ARCH_CONVERT, -(XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen)));
|
|
INT_SET(entry->nameidx, ARCH_CONVERT, INT_GET(map->base, ARCH_CONVERT) + INT_GET(map->size, ARCH_CONVERT));
|
|
INT_SET(entry->hashval, ARCH_CONVERT, args->hashval);
|
|
entry->namelen = args->namelen;
|
|
xfs_da_log_buf(args->trans, bp,
|
|
XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
|
|
|
|
/*
|
|
* Copy the string and inode number into the new space.
|
|
*/
|
|
namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
|
|
XFS_DIR_SF_PUT_DIRINO(&args->inumber, &namest->inumber);
|
|
memcpy(namest->name, args->name, args->namelen);
|
|
xfs_da_log_buf(args->trans, bp,
|
|
XFS_DA_LOGRANGE(leaf, namest, XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry)));
|
|
|
|
/*
|
|
* Update the control info for this leaf node
|
|
*/
|
|
if (INT_GET(entry->nameidx, ARCH_CONVERT) < INT_GET(hdr->firstused, ARCH_CONVERT))
|
|
INT_COPY(hdr->firstused, entry->nameidx, ARCH_CONVERT);
|
|
ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT) >= ((INT_GET(hdr->count, ARCH_CONVERT)*sizeof(*entry))+sizeof(*hdr)));
|
|
tmp = (INT_GET(hdr->count, ARCH_CONVERT)-1) * (uint)sizeof(xfs_dir_leaf_entry_t)
|
|
+ (uint)sizeof(xfs_dir_leaf_hdr_t);
|
|
map = &hdr->freemap[0];
|
|
for (i = 0; i < XFS_DIR_LEAF_MAPSIZE; map++, i++) {
|
|
if (INT_GET(map->base, ARCH_CONVERT) == tmp) {
|
|
INT_MOD(map->base, ARCH_CONVERT, (uint)sizeof(xfs_dir_leaf_entry_t));
|
|
INT_MOD(map->size, ARCH_CONVERT, -((uint)sizeof(xfs_dir_leaf_entry_t)));
|
|
}
|
|
}
|
|
INT_MOD(hdr->namebytes, ARCH_CONVERT, args->namelen);
|
|
xfs_da_log_buf(args->trans, bp,
|
|
XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
|
|
}
|
|
|
|
/*
|
|
* Garbage collect a leaf directory block by copying it to a new buffer.
|
|
*/
|
|
STATIC int
|
|
xfs_dir_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *bp, int musthave,
|
|
int justcheck)
|
|
{
|
|
xfs_dir_leafblock_t *leaf_s, *leaf_d;
|
|
xfs_dir_leaf_hdr_t *hdr_s, *hdr_d;
|
|
xfs_mount_t *mp;
|
|
char *tmpbuffer;
|
|
char *tmpbuffer2=NULL;
|
|
int rval;
|
|
int lbsize;
|
|
|
|
mp = trans->t_mountp;
|
|
lbsize = XFS_LBSIZE(mp);
|
|
tmpbuffer = kmem_alloc(lbsize, KM_SLEEP);
|
|
ASSERT(tmpbuffer != NULL);
|
|
memcpy(tmpbuffer, bp->data, lbsize);
|
|
|
|
/*
|
|
* Make a second copy in case xfs_dir_leaf_moveents()
|
|
* below destroys the original.
|
|
*/
|
|
if (musthave || justcheck) {
|
|
tmpbuffer2 = kmem_alloc(lbsize, KM_SLEEP);
|
|
memcpy(tmpbuffer2, bp->data, lbsize);
|
|
}
|
|
memset(bp->data, 0, lbsize);
|
|
|
|
/*
|
|
* Copy basic information
|
|
*/
|
|
leaf_s = (xfs_dir_leafblock_t *)tmpbuffer;
|
|
leaf_d = bp->data;
|
|
hdr_s = &leaf_s->hdr;
|
|
hdr_d = &leaf_d->hdr;
|
|
hdr_d->info = hdr_s->info; /* struct copy */
|
|
INT_SET(hdr_d->firstused, ARCH_CONVERT, lbsize);
|
|
if (!hdr_d->firstused)
|
|
INT_SET(hdr_d->firstused, ARCH_CONVERT, lbsize - 1);
|
|
hdr_d->namebytes = 0;
|
|
hdr_d->count = 0;
|
|
hdr_d->holes = 0;
|
|
INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT, sizeof(xfs_dir_leaf_hdr_t));
|
|
INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT, INT_GET(hdr_d->firstused, ARCH_CONVERT) - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
|
|
|
|
/*
|
|
* Copy all entry's in the same (sorted) order,
|
|
* but allocate filenames packed and in sequence.
|
|
* This changes the source (leaf_s) as well.
|
|
*/
|
|
xfs_dir_leaf_moveents(leaf_s, 0, leaf_d, 0, (int)INT_GET(hdr_s->count, ARCH_CONVERT), mp);
|
|
|
|
if (musthave && INT_GET(hdr_d->freemap[0].size, ARCH_CONVERT) < musthave)
|
|
rval = XFS_ERROR(ENOSPC);
|
|
else
|
|
rval = 0;
|
|
|
|
if (justcheck || rval == ENOSPC) {
|
|
ASSERT(tmpbuffer2);
|
|
memcpy(bp->data, tmpbuffer2, lbsize);
|
|
} else {
|
|
xfs_da_log_buf(trans, bp, 0, lbsize - 1);
|
|
}
|
|
|
|
kmem_free(tmpbuffer, lbsize);
|
|
if (musthave || justcheck)
|
|
kmem_free(tmpbuffer2, lbsize);
|
|
return rval;
|
|
}
|
|
|
|
/*
|
|
* Redistribute the directory entries between two leaf nodes,
|
|
* taking into account the size of the new entry.
|
|
*
|
|
* NOTE: if new block is empty, then it will get the upper half of old block.
|
|
*/
|
|
STATIC void
|
|
xfs_dir_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
|
|
xfs_da_state_blk_t *blk2)
|
|
{
|
|
xfs_da_state_blk_t *tmp_blk;
|
|
xfs_dir_leafblock_t *leaf1, *leaf2;
|
|
xfs_dir_leaf_hdr_t *hdr1, *hdr2;
|
|
int count, totallen, max, space, swap;
|
|
|
|
/*
|
|
* Set up environment.
|
|
*/
|
|
ASSERT(blk1->magic == XFS_DIR_LEAF_MAGIC);
|
|
ASSERT(blk2->magic == XFS_DIR_LEAF_MAGIC);
|
|
leaf1 = blk1->bp->data;
|
|
leaf2 = blk2->bp->data;
|
|
ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
|
|
/*
|
|
* Check ordering of blocks, reverse if it makes things simpler.
|
|
*/
|
|
swap = 0;
|
|
if (xfs_dir_leaf_order(blk1->bp, blk2->bp)) {
|
|
tmp_blk = blk1;
|
|
blk1 = blk2;
|
|
blk2 = tmp_blk;
|
|
leaf1 = blk1->bp->data;
|
|
leaf2 = blk2->bp->data;
|
|
swap = 1;
|
|
}
|
|
hdr1 = &leaf1->hdr;
|
|
hdr2 = &leaf2->hdr;
|
|
|
|
/*
|
|
* Examine entries until we reduce the absolute difference in
|
|
* byte usage between the two blocks to a minimum. Then get
|
|
* the direction to copy and the number of elements to move.
|
|
*/
|
|
state->inleaf = xfs_dir_leaf_figure_balance(state, blk1, blk2,
|
|
&count, &totallen);
|
|
if (swap)
|
|
state->inleaf = !state->inleaf;
|
|
|
|
/*
|
|
* Move any entries required from leaf to leaf:
|
|
*/
|
|
if (count < INT_GET(hdr1->count, ARCH_CONVERT)) {
|
|
/*
|
|
* Figure the total bytes to be added to the destination leaf.
|
|
*/
|
|
count = INT_GET(hdr1->count, ARCH_CONVERT) - count; /* number entries being moved */
|
|
space = INT_GET(hdr1->namebytes, ARCH_CONVERT) - totallen;
|
|
space += count * ((uint)sizeof(xfs_dir_leaf_name_t)-1);
|
|
space += count * (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
|
|
/*
|
|
* leaf2 is the destination, compact it if it looks tight.
|
|
*/
|
|
max = INT_GET(hdr2->firstused, ARCH_CONVERT) - (uint)sizeof(xfs_dir_leaf_hdr_t);
|
|
max -= INT_GET(hdr2->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
if (space > max) {
|
|
xfs_dir_leaf_compact(state->args->trans, blk2->bp,
|
|
0, 0);
|
|
}
|
|
|
|
/*
|
|
* Move high entries from leaf1 to low end of leaf2.
|
|
*/
|
|
xfs_dir_leaf_moveents(leaf1, INT_GET(hdr1->count, ARCH_CONVERT) - count,
|
|
leaf2, 0, count, state->mp);
|
|
|
|
xfs_da_log_buf(state->args->trans, blk1->bp, 0,
|
|
state->blocksize-1);
|
|
xfs_da_log_buf(state->args->trans, blk2->bp, 0,
|
|
state->blocksize-1);
|
|
|
|
} else if (count > INT_GET(hdr1->count, ARCH_CONVERT)) {
|
|
/*
|
|
* Figure the total bytes to be added to the destination leaf.
|
|
*/
|
|
count -= INT_GET(hdr1->count, ARCH_CONVERT); /* number entries being moved */
|
|
space = totallen - INT_GET(hdr1->namebytes, ARCH_CONVERT);
|
|
space += count * ((uint)sizeof(xfs_dir_leaf_name_t)-1);
|
|
space += count * (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
|
|
/*
|
|
* leaf1 is the destination, compact it if it looks tight.
|
|
*/
|
|
max = INT_GET(hdr1->firstused, ARCH_CONVERT) - (uint)sizeof(xfs_dir_leaf_hdr_t);
|
|
max -= INT_GET(hdr1->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
if (space > max) {
|
|
xfs_dir_leaf_compact(state->args->trans, blk1->bp,
|
|
0, 0);
|
|
}
|
|
|
|
/*
|
|
* Move low entries from leaf2 to high end of leaf1.
|
|
*/
|
|
xfs_dir_leaf_moveents(leaf2, 0, leaf1, (int)INT_GET(hdr1->count, ARCH_CONVERT),
|
|
count, state->mp);
|
|
|
|
xfs_da_log_buf(state->args->trans, blk1->bp, 0,
|
|
state->blocksize-1);
|
|
xfs_da_log_buf(state->args->trans, blk2->bp, 0,
|
|
state->blocksize-1);
|
|
}
|
|
|
|
/*
|
|
* Copy out last hashval in each block for B-tree code.
|
|
*/
|
|
blk1->hashval = INT_GET(leaf1->entries[ INT_GET(leaf1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
|
|
blk2->hashval = INT_GET(leaf2->entries[ INT_GET(leaf2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
|
|
|
|
/*
|
|
* Adjust the expected index for insertion.
|
|
* GROT: this doesn't work unless blk2 was originally empty.
|
|
*/
|
|
if (!state->inleaf) {
|
|
blk2->index = blk1->index - INT_GET(leaf1->hdr.count, ARCH_CONVERT);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Examine entries until we reduce the absolute difference in
|
|
* byte usage between the two blocks to a minimum.
|
|
* GROT: Is this really necessary? With other than a 512 byte blocksize,
|
|
* GROT: there will always be enough room in either block for a new entry.
|
|
* GROT: Do a double-split for this case?
|
|
*/
|
|
STATIC int
|
|
xfs_dir_leaf_figure_balance(xfs_da_state_t *state,
|
|
xfs_da_state_blk_t *blk1,
|
|
xfs_da_state_blk_t *blk2,
|
|
int *countarg, int *namebytesarg)
|
|
{
|
|
xfs_dir_leafblock_t *leaf1, *leaf2;
|
|
xfs_dir_leaf_hdr_t *hdr1, *hdr2;
|
|
xfs_dir_leaf_entry_t *entry;
|
|
int count, max, totallen, half;
|
|
int lastdelta, foundit, tmp;
|
|
|
|
/*
|
|
* Set up environment.
|
|
*/
|
|
leaf1 = blk1->bp->data;
|
|
leaf2 = blk2->bp->data;
|
|
hdr1 = &leaf1->hdr;
|
|
hdr2 = &leaf2->hdr;
|
|
foundit = 0;
|
|
totallen = 0;
|
|
|
|
/*
|
|
* Examine entries until we reduce the absolute difference in
|
|
* byte usage between the two blocks to a minimum.
|
|
*/
|
|
max = INT_GET(hdr1->count, ARCH_CONVERT) + INT_GET(hdr2->count, ARCH_CONVERT);
|
|
half = (max+1) * (uint)(sizeof(*entry)+sizeof(xfs_dir_leaf_entry_t)-1);
|
|
half += INT_GET(hdr1->namebytes, ARCH_CONVERT) + INT_GET(hdr2->namebytes, ARCH_CONVERT) + state->args->namelen;
|
|
half /= 2;
|
|
lastdelta = state->blocksize;
|
|
entry = &leaf1->entries[0];
|
|
for (count = 0; count < max; entry++, count++) {
|
|
|
|
#define XFS_DIR_ABS(A) (((A) < 0) ? -(A) : (A))
|
|
/*
|
|
* The new entry is in the first block, account for it.
|
|
*/
|
|
if (count == blk1->index) {
|
|
tmp = totallen + (uint)sizeof(*entry)
|
|
+ XFS_DIR_LEAF_ENTSIZE_BYNAME(state->args->namelen);
|
|
if (XFS_DIR_ABS(half - tmp) > lastdelta)
|
|
break;
|
|
lastdelta = XFS_DIR_ABS(half - tmp);
|
|
totallen = tmp;
|
|
foundit = 1;
|
|
}
|
|
|
|
/*
|
|
* Wrap around into the second block if necessary.
|
|
*/
|
|
if (count == INT_GET(hdr1->count, ARCH_CONVERT)) {
|
|
leaf1 = leaf2;
|
|
entry = &leaf1->entries[0];
|
|
}
|
|
|
|
/*
|
|
* Figure out if next leaf entry would be too much.
|
|
*/
|
|
tmp = totallen + (uint)sizeof(*entry)
|
|
+ XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry);
|
|
if (XFS_DIR_ABS(half - tmp) > lastdelta)
|
|
break;
|
|
lastdelta = XFS_DIR_ABS(half - tmp);
|
|
totallen = tmp;
|
|
#undef XFS_DIR_ABS
|
|
}
|
|
|
|
/*
|
|
* Calculate the number of namebytes that will end up in lower block.
|
|
* If new entry not in lower block, fix up the count.
|
|
*/
|
|
totallen -=
|
|
count * (uint)(sizeof(*entry)+sizeof(xfs_dir_leaf_entry_t)-1);
|
|
if (foundit) {
|
|
totallen -= (sizeof(*entry)+sizeof(xfs_dir_leaf_entry_t)-1) +
|
|
state->args->namelen;
|
|
}
|
|
|
|
*countarg = count;
|
|
*namebytesarg = totallen;
|
|
return foundit;
|
|
}
|
|
|
|
/*========================================================================
|
|
* Routines used for shrinking the Btree.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Check a leaf block and its neighbors to see if the block should be
|
|
* collapsed into one or the other neighbor. Always keep the block
|
|
* with the smaller block number.
|
|
* If the current block is over 50% full, don't try to join it, return 0.
|
|
* If the block is empty, fill in the state structure and return 2.
|
|
* If it can be collapsed, fill in the state structure and return 1.
|
|
* If nothing can be done, return 0.
|
|
*/
|
|
int
|
|
xfs_dir_leaf_toosmall(xfs_da_state_t *state, int *action)
|
|
{
|
|
xfs_dir_leafblock_t *leaf;
|
|
xfs_da_state_blk_t *blk;
|
|
xfs_da_blkinfo_t *info;
|
|
int count, bytes, forward, error, retval, i;
|
|
xfs_dablk_t blkno;
|
|
xfs_dabuf_t *bp;
|
|
|
|
/*
|
|
* Check for the degenerate case of the block being over 50% full.
|
|
* If so, it's not worth even looking to see if we might be able
|
|
* to coalesce with a sibling.
|
|
*/
|
|
blk = &state->path.blk[ state->path.active-1 ];
|
|
info = blk->bp->data;
|
|
ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
leaf = (xfs_dir_leafblock_t *)info;
|
|
count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
|
|
bytes = (uint)sizeof(xfs_dir_leaf_hdr_t) +
|
|
count * (uint)sizeof(xfs_dir_leaf_entry_t) +
|
|
count * ((uint)sizeof(xfs_dir_leaf_name_t)-1) +
|
|
INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
|
|
if (bytes > (state->blocksize >> 1)) {
|
|
*action = 0; /* blk over 50%, don't try to join */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check for the degenerate case of the block being empty.
|
|
* If the block is empty, we'll simply delete it, no need to
|
|
* coalesce it with a sibling block. We choose (aribtrarily)
|
|
* to merge with the forward block unless it is NULL.
|
|
*/
|
|
if (count == 0) {
|
|
/*
|
|
* Make altpath point to the block we want to keep and
|
|
* path point to the block we want to drop (this one).
|
|
*/
|
|
forward = info->forw;
|
|
memcpy(&state->altpath, &state->path, sizeof(state->path));
|
|
error = xfs_da_path_shift(state, &state->altpath, forward,
|
|
0, &retval);
|
|
if (error)
|
|
return error;
|
|
if (retval) {
|
|
*action = 0;
|
|
} else {
|
|
*action = 2;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Examine each sibling block to see if we can coalesce with
|
|
* at least 25% free space to spare. We need to figure out
|
|
* whether to merge with the forward or the backward block.
|
|
* We prefer coalescing with the lower numbered sibling so as
|
|
* to shrink a directory over time.
|
|
*/
|
|
forward = (INT_GET(info->forw, ARCH_CONVERT) < INT_GET(info->back, ARCH_CONVERT)); /* start with smaller blk num */
|
|
for (i = 0; i < 2; forward = !forward, i++) {
|
|
if (forward)
|
|
blkno = INT_GET(info->forw, ARCH_CONVERT);
|
|
else
|
|
blkno = INT_GET(info->back, ARCH_CONVERT);
|
|
if (blkno == 0)
|
|
continue;
|
|
error = xfs_da_read_buf(state->args->trans, state->args->dp,
|
|
blkno, -1, &bp,
|
|
XFS_DATA_FORK);
|
|
if (error)
|
|
return error;
|
|
ASSERT(bp != NULL);
|
|
|
|
leaf = (xfs_dir_leafblock_t *)info;
|
|
count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
|
|
bytes = state->blocksize - (state->blocksize>>2);
|
|
bytes -= INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
|
|
leaf = bp->data;
|
|
ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
count += INT_GET(leaf->hdr.count, ARCH_CONVERT);
|
|
bytes -= INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
|
|
bytes -= count * ((uint)sizeof(xfs_dir_leaf_name_t) - 1);
|
|
bytes -= count * (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
bytes -= (uint)sizeof(xfs_dir_leaf_hdr_t);
|
|
if (bytes >= 0)
|
|
break; /* fits with at least 25% to spare */
|
|
|
|
xfs_da_brelse(state->args->trans, bp);
|
|
}
|
|
if (i >= 2) {
|
|
*action = 0;
|
|
return 0;
|
|
}
|
|
xfs_da_buf_done(bp);
|
|
|
|
/*
|
|
* Make altpath point to the block we want to keep (the lower
|
|
* numbered block) and path point to the block we want to drop.
|
|
*/
|
|
memcpy(&state->altpath, &state->path, sizeof(state->path));
|
|
if (blkno < blk->blkno) {
|
|
error = xfs_da_path_shift(state, &state->altpath, forward,
|
|
0, &retval);
|
|
} else {
|
|
error = xfs_da_path_shift(state, &state->path, forward,
|
|
0, &retval);
|
|
}
|
|
if (error)
|
|
return error;
|
|
if (retval) {
|
|
*action = 0;
|
|
} else {
|
|
*action = 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove a name from the leaf directory structure.
|
|
*
|
|
* Return 1 if leaf is less than 37% full, 0 if >= 37% full.
|
|
* If two leaves are 37% full, when combined they will leave 25% free.
|
|
*/
|
|
int
|
|
xfs_dir_leaf_remove(xfs_trans_t *trans, xfs_dabuf_t *bp, int index)
|
|
{
|
|
xfs_dir_leafblock_t *leaf;
|
|
xfs_dir_leaf_hdr_t *hdr;
|
|
xfs_dir_leaf_map_t *map;
|
|
xfs_dir_leaf_entry_t *entry;
|
|
xfs_dir_leaf_name_t *namest;
|
|
int before, after, smallest, entsize;
|
|
int tablesize, tmp, i;
|
|
xfs_mount_t *mp;
|
|
|
|
leaf = bp->data;
|
|
ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
hdr = &leaf->hdr;
|
|
mp = trans->t_mountp;
|
|
ASSERT((INT_GET(hdr->count, ARCH_CONVERT) > 0) && (INT_GET(hdr->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8)));
|
|
ASSERT((index >= 0) && (index < INT_GET(hdr->count, ARCH_CONVERT)));
|
|
ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT) >= ((INT_GET(hdr->count, ARCH_CONVERT)*sizeof(*entry))+sizeof(*hdr)));
|
|
entry = &leaf->entries[index];
|
|
ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) >= INT_GET(hdr->firstused, ARCH_CONVERT));
|
|
ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) < XFS_LBSIZE(mp));
|
|
|
|
/*
|
|
* Scan through free region table:
|
|
* check for adjacency of free'd entry with an existing one,
|
|
* find smallest free region in case we need to replace it,
|
|
* adjust any map that borders the entry table,
|
|
*/
|
|
tablesize = INT_GET(hdr->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t)
|
|
+ (uint)sizeof(xfs_dir_leaf_hdr_t);
|
|
map = &hdr->freemap[0];
|
|
tmp = INT_GET(map->size, ARCH_CONVERT);
|
|
before = after = -1;
|
|
smallest = XFS_DIR_LEAF_MAPSIZE - 1;
|
|
entsize = XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry);
|
|
for (i = 0; i < XFS_DIR_LEAF_MAPSIZE; map++, i++) {
|
|
ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
|
|
ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
|
|
if (INT_GET(map->base, ARCH_CONVERT) == tablesize) {
|
|
INT_MOD(map->base, ARCH_CONVERT, -((uint)sizeof(xfs_dir_leaf_entry_t)));
|
|
INT_MOD(map->size, ARCH_CONVERT, (uint)sizeof(xfs_dir_leaf_entry_t));
|
|
}
|
|
|
|
if ((INT_GET(map->base, ARCH_CONVERT) + INT_GET(map->size, ARCH_CONVERT)) == INT_GET(entry->nameidx, ARCH_CONVERT)) {
|
|
before = i;
|
|
} else if (INT_GET(map->base, ARCH_CONVERT) == (INT_GET(entry->nameidx, ARCH_CONVERT) + entsize)) {
|
|
after = i;
|
|
} else if (INT_GET(map->size, ARCH_CONVERT) < tmp) {
|
|
tmp = INT_GET(map->size, ARCH_CONVERT);
|
|
smallest = i;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Coalesce adjacent freemap regions,
|
|
* or replace the smallest region.
|
|
*/
|
|
if ((before >= 0) || (after >= 0)) {
|
|
if ((before >= 0) && (after >= 0)) {
|
|
map = &hdr->freemap[before];
|
|
INT_MOD(map->size, ARCH_CONVERT, entsize);
|
|
INT_MOD(map->size, ARCH_CONVERT, INT_GET(hdr->freemap[after].size, ARCH_CONVERT));
|
|
hdr->freemap[after].base = 0;
|
|
hdr->freemap[after].size = 0;
|
|
} else if (before >= 0) {
|
|
map = &hdr->freemap[before];
|
|
INT_MOD(map->size, ARCH_CONVERT, entsize);
|
|
} else {
|
|
map = &hdr->freemap[after];
|
|
INT_COPY(map->base, entry->nameidx, ARCH_CONVERT);
|
|
INT_MOD(map->size, ARCH_CONVERT, entsize);
|
|
}
|
|
} else {
|
|
/*
|
|
* Replace smallest region (if it is smaller than free'd entry)
|
|
*/
|
|
map = &hdr->freemap[smallest];
|
|
if (INT_GET(map->size, ARCH_CONVERT) < entsize) {
|
|
INT_COPY(map->base, entry->nameidx, ARCH_CONVERT);
|
|
INT_SET(map->size, ARCH_CONVERT, entsize);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Did we remove the first entry?
|
|
*/
|
|
if (INT_GET(entry->nameidx, ARCH_CONVERT) == INT_GET(hdr->firstused, ARCH_CONVERT))
|
|
smallest = 1;
|
|
else
|
|
smallest = 0;
|
|
|
|
/*
|
|
* Compress the remaining entries and zero out the removed stuff.
|
|
*/
|
|
namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
|
|
memset((char *)namest, 0, entsize);
|
|
xfs_da_log_buf(trans, bp, XFS_DA_LOGRANGE(leaf, namest, entsize));
|
|
|
|
INT_MOD(hdr->namebytes, ARCH_CONVERT, -(entry->namelen));
|
|
tmp = (INT_GET(hdr->count, ARCH_CONVERT) - index) * (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
memmove(entry, entry + 1, tmp);
|
|
INT_MOD(hdr->count, ARCH_CONVERT, -1);
|
|
xfs_da_log_buf(trans, bp,
|
|
XFS_DA_LOGRANGE(leaf, entry, tmp + (uint)sizeof(*entry)));
|
|
entry = &leaf->entries[INT_GET(hdr->count, ARCH_CONVERT)];
|
|
memset((char *)entry, 0, sizeof(xfs_dir_leaf_entry_t));
|
|
|
|
/*
|
|
* If we removed the first entry, re-find the first used byte
|
|
* in the name area. Note that if the entry was the "firstused",
|
|
* then we don't have a "hole" in our block resulting from
|
|
* removing the name.
|
|
*/
|
|
if (smallest) {
|
|
tmp = XFS_LBSIZE(mp);
|
|
entry = &leaf->entries[0];
|
|
for (i = INT_GET(hdr->count, ARCH_CONVERT)-1; i >= 0; entry++, i--) {
|
|
ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) >= INT_GET(hdr->firstused, ARCH_CONVERT));
|
|
ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) < XFS_LBSIZE(mp));
|
|
if (INT_GET(entry->nameidx, ARCH_CONVERT) < tmp)
|
|
tmp = INT_GET(entry->nameidx, ARCH_CONVERT);
|
|
}
|
|
INT_SET(hdr->firstused, ARCH_CONVERT, tmp);
|
|
if (!hdr->firstused)
|
|
INT_SET(hdr->firstused, ARCH_CONVERT, tmp - 1);
|
|
} else {
|
|
hdr->holes = 1; /* mark as needing compaction */
|
|
}
|
|
|
|
xfs_da_log_buf(trans, bp, XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
|
|
|
|
/*
|
|
* Check if leaf is less than 50% full, caller may want to
|
|
* "join" the leaf with a sibling if so.
|
|
*/
|
|
tmp = (uint)sizeof(xfs_dir_leaf_hdr_t);
|
|
tmp += INT_GET(leaf->hdr.count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
tmp += INT_GET(leaf->hdr.count, ARCH_CONVERT) * ((uint)sizeof(xfs_dir_leaf_name_t) - 1);
|
|
tmp += INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
|
|
if (tmp < mp->m_dir_magicpct)
|
|
return 1; /* leaf is < 37% full */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Move all the directory entries from drop_leaf into save_leaf.
|
|
*/
|
|
void
|
|
xfs_dir_leaf_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
|
|
xfs_da_state_blk_t *save_blk)
|
|
{
|
|
xfs_dir_leafblock_t *drop_leaf, *save_leaf, *tmp_leaf;
|
|
xfs_dir_leaf_hdr_t *drop_hdr, *save_hdr, *tmp_hdr;
|
|
xfs_mount_t *mp;
|
|
char *tmpbuffer;
|
|
|
|
/*
|
|
* Set up environment.
|
|
*/
|
|
mp = state->mp;
|
|
ASSERT(drop_blk->magic == XFS_DIR_LEAF_MAGIC);
|
|
ASSERT(save_blk->magic == XFS_DIR_LEAF_MAGIC);
|
|
drop_leaf = drop_blk->bp->data;
|
|
save_leaf = save_blk->bp->data;
|
|
ASSERT(INT_GET(drop_leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
ASSERT(INT_GET(save_leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
drop_hdr = &drop_leaf->hdr;
|
|
save_hdr = &save_leaf->hdr;
|
|
|
|
/*
|
|
* Save last hashval from dying block for later Btree fixup.
|
|
*/
|
|
drop_blk->hashval = INT_GET(drop_leaf->entries[ drop_leaf->hdr.count-1 ].hashval, ARCH_CONVERT);
|
|
|
|
/*
|
|
* Check if we need a temp buffer, or can we do it in place.
|
|
* Note that we don't check "leaf" for holes because we will
|
|
* always be dropping it, toosmall() decided that for us already.
|
|
*/
|
|
if (save_hdr->holes == 0) {
|
|
/*
|
|
* dest leaf has no holes, so we add there. May need
|
|
* to make some room in the entry array.
|
|
*/
|
|
if (xfs_dir_leaf_order(save_blk->bp, drop_blk->bp)) {
|
|
xfs_dir_leaf_moveents(drop_leaf, 0, save_leaf, 0,
|
|
(int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
|
|
} else {
|
|
xfs_dir_leaf_moveents(drop_leaf, 0,
|
|
save_leaf, INT_GET(save_hdr->count, ARCH_CONVERT),
|
|
(int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
|
|
}
|
|
} else {
|
|
/*
|
|
* Destination has holes, so we make a temporary copy
|
|
* of the leaf and add them both to that.
|
|
*/
|
|
tmpbuffer = kmem_alloc(state->blocksize, KM_SLEEP);
|
|
ASSERT(tmpbuffer != NULL);
|
|
memset(tmpbuffer, 0, state->blocksize);
|
|
tmp_leaf = (xfs_dir_leafblock_t *)tmpbuffer;
|
|
tmp_hdr = &tmp_leaf->hdr;
|
|
tmp_hdr->info = save_hdr->info; /* struct copy */
|
|
tmp_hdr->count = 0;
|
|
INT_SET(tmp_hdr->firstused, ARCH_CONVERT, state->blocksize);
|
|
if (!tmp_hdr->firstused)
|
|
INT_SET(tmp_hdr->firstused, ARCH_CONVERT, state->blocksize - 1);
|
|
tmp_hdr->namebytes = 0;
|
|
if (xfs_dir_leaf_order(save_blk->bp, drop_blk->bp)) {
|
|
xfs_dir_leaf_moveents(drop_leaf, 0, tmp_leaf, 0,
|
|
(int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
|
|
xfs_dir_leaf_moveents(save_leaf, 0,
|
|
tmp_leaf, INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
|
|
(int)INT_GET(save_hdr->count, ARCH_CONVERT), mp);
|
|
} else {
|
|
xfs_dir_leaf_moveents(save_leaf, 0, tmp_leaf, 0,
|
|
(int)INT_GET(save_hdr->count, ARCH_CONVERT), mp);
|
|
xfs_dir_leaf_moveents(drop_leaf, 0,
|
|
tmp_leaf, INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
|
|
(int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
|
|
}
|
|
memcpy(save_leaf, tmp_leaf, state->blocksize);
|
|
kmem_free(tmpbuffer, state->blocksize);
|
|
}
|
|
|
|
xfs_da_log_buf(state->args->trans, save_blk->bp, 0,
|
|
state->blocksize - 1);
|
|
|
|
/*
|
|
* Copy out last hashval in each block for B-tree code.
|
|
*/
|
|
save_blk->hashval = INT_GET(save_leaf->entries[ INT_GET(save_leaf->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
|
|
}
|
|
|
|
/*========================================================================
|
|
* Routines used for finding things in the Btree.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Look up a name in a leaf directory structure.
|
|
* This is the internal routine, it uses the caller's buffer.
|
|
*
|
|
* Note that duplicate keys are allowed, but only check within the
|
|
* current leaf node. The Btree code must check in adjacent leaf nodes.
|
|
*
|
|
* Return in *index the index into the entry[] array of either the found
|
|
* entry, or where the entry should have been (insert before that entry).
|
|
*
|
|
* Don't change the args->inumber unless we find the filename.
|
|
*/
|
|
int
|
|
xfs_dir_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args, int *index)
|
|
{
|
|
xfs_dir_leafblock_t *leaf;
|
|
xfs_dir_leaf_entry_t *entry;
|
|
xfs_dir_leaf_name_t *namest;
|
|
int probe, span;
|
|
xfs_dahash_t hashval;
|
|
|
|
leaf = bp->data;
|
|
ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) < (XFS_LBSIZE(args->dp->i_mount)/8));
|
|
|
|
/*
|
|
* Binary search. (note: small blocks will skip this loop)
|
|
*/
|
|
hashval = args->hashval;
|
|
probe = span = INT_GET(leaf->hdr.count, ARCH_CONVERT) / 2;
|
|
for (entry = &leaf->entries[probe]; span > 4;
|
|
entry = &leaf->entries[probe]) {
|
|
span /= 2;
|
|
if (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)
|
|
probe += span;
|
|
else if (INT_GET(entry->hashval, ARCH_CONVERT) > hashval)
|
|
probe -= span;
|
|
else
|
|
break;
|
|
}
|
|
ASSERT((probe >= 0) && \
|
|
((!leaf->hdr.count) || (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))));
|
|
ASSERT((span <= 4) || (INT_GET(entry->hashval, ARCH_CONVERT) == hashval));
|
|
|
|
/*
|
|
* Since we may have duplicate hashval's, find the first matching
|
|
* hashval in the leaf.
|
|
*/
|
|
while ((probe > 0) && (INT_GET(entry->hashval, ARCH_CONVERT) >= hashval)) {
|
|
entry--;
|
|
probe--;
|
|
}
|
|
while ((probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)) && (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)) {
|
|
entry++;
|
|
probe++;
|
|
}
|
|
if ((probe == INT_GET(leaf->hdr.count, ARCH_CONVERT)) || (INT_GET(entry->hashval, ARCH_CONVERT) != hashval)) {
|
|
*index = probe;
|
|
ASSERT(args->oknoent);
|
|
return XFS_ERROR(ENOENT);
|
|
}
|
|
|
|
/*
|
|
* Duplicate keys may be present, so search all of them for a match.
|
|
*/
|
|
while ((probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)) && (INT_GET(entry->hashval, ARCH_CONVERT) == hashval)) {
|
|
namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
|
|
if (entry->namelen == args->namelen &&
|
|
namest->name[0] == args->name[0] &&
|
|
memcmp(args->name, namest->name, args->namelen) == 0) {
|
|
XFS_DIR_SF_GET_DIRINO(&namest->inumber, &args->inumber);
|
|
*index = probe;
|
|
return XFS_ERROR(EEXIST);
|
|
}
|
|
entry++;
|
|
probe++;
|
|
}
|
|
*index = probe;
|
|
ASSERT(probe == INT_GET(leaf->hdr.count, ARCH_CONVERT) || args->oknoent);
|
|
return XFS_ERROR(ENOENT);
|
|
}
|
|
|
|
/*========================================================================
|
|
* Utility routines.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Move the indicated entries from one leaf to another.
|
|
* NOTE: this routine modifies both source and destination leaves.
|
|
*/
|
|
/* ARGSUSED */
|
|
STATIC void
|
|
xfs_dir_leaf_moveents(xfs_dir_leafblock_t *leaf_s, int start_s,
|
|
xfs_dir_leafblock_t *leaf_d, int start_d,
|
|
int count, xfs_mount_t *mp)
|
|
{
|
|
xfs_dir_leaf_hdr_t *hdr_s, *hdr_d;
|
|
xfs_dir_leaf_entry_t *entry_s, *entry_d;
|
|
int tmp, i;
|
|
|
|
/*
|
|
* Check for nothing to do.
|
|
*/
|
|
if (count == 0)
|
|
return;
|
|
|
|
/*
|
|
* Set up environment.
|
|
*/
|
|
ASSERT(INT_GET(leaf_s->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
ASSERT(INT_GET(leaf_d->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
hdr_s = &leaf_s->hdr;
|
|
hdr_d = &leaf_d->hdr;
|
|
ASSERT((INT_GET(hdr_s->count, ARCH_CONVERT) > 0) && (INT_GET(hdr_s->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8)));
|
|
ASSERT(INT_GET(hdr_s->firstused, ARCH_CONVERT) >=
|
|
((INT_GET(hdr_s->count, ARCH_CONVERT)*sizeof(*entry_s))+sizeof(*hdr_s)));
|
|
ASSERT(INT_GET(hdr_d->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8));
|
|
ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >=
|
|
((INT_GET(hdr_d->count, ARCH_CONVERT)*sizeof(*entry_d))+sizeof(*hdr_d)));
|
|
|
|
ASSERT(start_s < INT_GET(hdr_s->count, ARCH_CONVERT));
|
|
ASSERT(start_d <= INT_GET(hdr_d->count, ARCH_CONVERT));
|
|
ASSERT(count <= INT_GET(hdr_s->count, ARCH_CONVERT));
|
|
|
|
/*
|
|
* Move the entries in the destination leaf up to make a hole?
|
|
*/
|
|
if (start_d < INT_GET(hdr_d->count, ARCH_CONVERT)) {
|
|
tmp = INT_GET(hdr_d->count, ARCH_CONVERT) - start_d;
|
|
tmp *= (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
entry_s = &leaf_d->entries[start_d];
|
|
entry_d = &leaf_d->entries[start_d + count];
|
|
memcpy(entry_d, entry_s, tmp);
|
|
}
|
|
|
|
/*
|
|
* Copy all entry's in the same (sorted) order,
|
|
* but allocate filenames packed and in sequence.
|
|
*/
|
|
entry_s = &leaf_s->entries[start_s];
|
|
entry_d = &leaf_d->entries[start_d];
|
|
for (i = 0; i < count; entry_s++, entry_d++, i++) {
|
|
ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) >= INT_GET(hdr_s->firstused, ARCH_CONVERT));
|
|
tmp = XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry_s);
|
|
INT_MOD(hdr_d->firstused, ARCH_CONVERT, -(tmp));
|
|
entry_d->hashval = entry_s->hashval; /* INT_: direct copy */
|
|
INT_COPY(entry_d->nameidx, hdr_d->firstused, ARCH_CONVERT);
|
|
entry_d->namelen = entry_s->namelen;
|
|
ASSERT(INT_GET(entry_d->nameidx, ARCH_CONVERT) + tmp <= XFS_LBSIZE(mp));
|
|
memcpy(XFS_DIR_LEAF_NAMESTRUCT(leaf_d, INT_GET(entry_d->nameidx, ARCH_CONVERT)),
|
|
XFS_DIR_LEAF_NAMESTRUCT(leaf_s, INT_GET(entry_s->nameidx, ARCH_CONVERT)), tmp);
|
|
ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) + tmp <= XFS_LBSIZE(mp));
|
|
memset((char *)XFS_DIR_LEAF_NAMESTRUCT(leaf_s, INT_GET(entry_s->nameidx, ARCH_CONVERT)),
|
|
0, tmp);
|
|
INT_MOD(hdr_s->namebytes, ARCH_CONVERT, -(entry_d->namelen));
|
|
INT_MOD(hdr_d->namebytes, ARCH_CONVERT, entry_d->namelen);
|
|
INT_MOD(hdr_s->count, ARCH_CONVERT, -1);
|
|
INT_MOD(hdr_d->count, ARCH_CONVERT, +1);
|
|
tmp = INT_GET(hdr_d->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t)
|
|
+ (uint)sizeof(xfs_dir_leaf_hdr_t);
|
|
ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >= tmp);
|
|
|
|
}
|
|
|
|
/*
|
|
* Zero out the entries we just copied.
|
|
*/
|
|
if (start_s == INT_GET(hdr_s->count, ARCH_CONVERT)) {
|
|
tmp = count * (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
entry_s = &leaf_s->entries[start_s];
|
|
ASSERT((char *)entry_s + tmp <= (char *)leaf_s + XFS_LBSIZE(mp));
|
|
memset((char *)entry_s, 0, tmp);
|
|
} else {
|
|
/*
|
|
* Move the remaining entries down to fill the hole,
|
|
* then zero the entries at the top.
|
|
*/
|
|
tmp = INT_GET(hdr_s->count, ARCH_CONVERT) - count;
|
|
tmp *= (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
entry_s = &leaf_s->entries[start_s + count];
|
|
entry_d = &leaf_s->entries[start_s];
|
|
memcpy(entry_d, entry_s, tmp);
|
|
|
|
tmp = count * (uint)sizeof(xfs_dir_leaf_entry_t);
|
|
entry_s = &leaf_s->entries[INT_GET(hdr_s->count, ARCH_CONVERT)];
|
|
ASSERT((char *)entry_s + tmp <= (char *)leaf_s + XFS_LBSIZE(mp));
|
|
memset((char *)entry_s, 0, tmp);
|
|
}
|
|
|
|
/*
|
|
* Fill in the freemap information
|
|
*/
|
|
INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT, (uint)sizeof(xfs_dir_leaf_hdr_t));
|
|
INT_MOD(hdr_d->freemap[0].base, ARCH_CONVERT, INT_GET(hdr_d->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t));
|
|
INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT, INT_GET(hdr_d->firstused, ARCH_CONVERT) - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
|
|
INT_SET(hdr_d->freemap[1].base, ARCH_CONVERT, (hdr_d->freemap[2].base = 0));
|
|
INT_SET(hdr_d->freemap[1].size, ARCH_CONVERT, (hdr_d->freemap[2].size = 0));
|
|
hdr_s->holes = 1; /* leaf may not be compact */
|
|
}
|
|
|
|
/*
|
|
* Compare two leaf blocks "order".
|
|
*/
|
|
int
|
|
xfs_dir_leaf_order(xfs_dabuf_t *leaf1_bp, xfs_dabuf_t *leaf2_bp)
|
|
{
|
|
xfs_dir_leafblock_t *leaf1, *leaf2;
|
|
|
|
leaf1 = leaf1_bp->data;
|
|
leaf2 = leaf2_bp->data;
|
|
ASSERT((INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC) &&
|
|
(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC));
|
|
if ((INT_GET(leaf1->hdr.count, ARCH_CONVERT) > 0) && (INT_GET(leaf2->hdr.count, ARCH_CONVERT) > 0) &&
|
|
((INT_GET(leaf2->entries[ 0 ].hashval, ARCH_CONVERT) <
|
|
INT_GET(leaf1->entries[ 0 ].hashval, ARCH_CONVERT)) ||
|
|
(INT_GET(leaf2->entries[ INT_GET(leaf2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT) <
|
|
INT_GET(leaf1->entries[ INT_GET(leaf1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT)))) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Pick up the last hashvalue from a leaf block.
|
|
*/
|
|
xfs_dahash_t
|
|
xfs_dir_leaf_lasthash(xfs_dabuf_t *bp, int *count)
|
|
{
|
|
xfs_dir_leafblock_t *leaf;
|
|
|
|
leaf = bp->data;
|
|
ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
|
|
if (count)
|
|
*count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
|
|
if (!leaf->hdr.count)
|
|
return(0);
|
|
return(INT_GET(leaf->entries[ INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT));
|
|
}
|
|
|
|
/*
|
|
* Copy out directory entries for getdents(), for leaf directories.
|
|
*/
|
|
int
|
|
xfs_dir_leaf_getdents_int(
|
|
xfs_dabuf_t *bp,
|
|
xfs_inode_t *dp,
|
|
xfs_dablk_t bno,
|
|
uio_t *uio,
|
|
int *eobp,
|
|
xfs_dirent_t *dbp,
|
|
xfs_dir_put_t put,
|
|
xfs_daddr_t nextda)
|
|
{
|
|
xfs_dir_leafblock_t *leaf;
|
|
xfs_dir_leaf_entry_t *entry;
|
|
xfs_dir_leaf_name_t *namest;
|
|
int entno, want_entno, i, nextentno;
|
|
xfs_mount_t *mp;
|
|
xfs_dahash_t cookhash;
|
|
xfs_dahash_t nexthash = 0;
|
|
#if (BITS_PER_LONG == 32)
|
|
xfs_dahash_t lasthash = XFS_DA_MAXHASH;
|
|
#endif
|
|
xfs_dir_put_args_t p;
|
|
|
|
mp = dp->i_mount;
|
|
leaf = bp->data;
|
|
if (INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) != XFS_DIR_LEAF_MAGIC) {
|
|
*eobp = 1;
|
|
return XFS_ERROR(ENOENT); /* XXX wrong code */
|
|
}
|
|
|
|
want_entno = XFS_DA_COOKIE_ENTRY(mp, uio->uio_offset);
|
|
|
|
cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset);
|
|
|
|
xfs_dir_trace_g_dul("leaf: start", dp, uio, leaf);
|
|
|
|
/*
|
|
* Re-find our place.
|
|
*/
|
|
for (i = entno = 0, entry = &leaf->entries[0];
|
|
i < INT_GET(leaf->hdr.count, ARCH_CONVERT);
|
|
entry++, i++) {
|
|
|
|
namest = XFS_DIR_LEAF_NAMESTRUCT(leaf,
|
|
INT_GET(entry->nameidx, ARCH_CONVERT));
|
|
|
|
if (unlikely(
|
|
((char *)namest < (char *)leaf) ||
|
|
((char *)namest >= (char *)leaf + XFS_LBSIZE(mp)))) {
|
|
XFS_CORRUPTION_ERROR("xfs_dir_leaf_getdents_int(1)",
|
|
XFS_ERRLEVEL_LOW, mp, leaf);
|
|
xfs_dir_trace_g_du("leaf: corrupted", dp, uio);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
if (INT_GET(entry->hashval, ARCH_CONVERT) >= cookhash) {
|
|
if ( entno < want_entno
|
|
&& INT_GET(entry->hashval, ARCH_CONVERT)
|
|
== cookhash) {
|
|
/*
|
|
* Trying to get to a particular offset in a
|
|
* run of equal-hashval entries.
|
|
*/
|
|
entno++;
|
|
} else if ( want_entno > 0
|
|
&& entno == want_entno
|
|
&& INT_GET(entry->hashval, ARCH_CONVERT)
|
|
== cookhash) {
|
|
break;
|
|
} else {
|
|
entno = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (i == INT_GET(leaf->hdr.count, ARCH_CONVERT)) {
|
|
xfs_dir_trace_g_du("leaf: hash not found", dp, uio);
|
|
if (!INT_GET(leaf->hdr.info.forw, ARCH_CONVERT))
|
|
uio->uio_offset =
|
|
XFS_DA_MAKE_COOKIE(mp, 0, 0, XFS_DA_MAXHASH);
|
|
/*
|
|
* Don't set uio_offset if there's another block:
|
|
* the node code will be setting uio_offset anyway.
|
|
*/
|
|
*eobp = 0;
|
|
return 0;
|
|
}
|
|
xfs_dir_trace_g_due("leaf: hash found", dp, uio, entry);
|
|
|
|
p.dbp = dbp;
|
|
p.put = put;
|
|
p.uio = uio;
|
|
|
|
/*
|
|
* We're synchronized, start copying entries out to the user.
|
|
*/
|
|
for (; entno >= 0 && i < INT_GET(leaf->hdr.count, ARCH_CONVERT);
|
|
entry++, i++, (entno = nextentno)) {
|
|
int lastresid=0, retval;
|
|
xfs_dircook_t lastoffset;
|
|
xfs_dahash_t thishash;
|
|
|
|
/*
|
|
* Check for a damaged directory leaf block and pick up
|
|
* the inode number from this entry.
|
|
*/
|
|
namest = XFS_DIR_LEAF_NAMESTRUCT(leaf,
|
|
INT_GET(entry->nameidx, ARCH_CONVERT));
|
|
|
|
if (unlikely(
|
|
((char *)namest < (char *)leaf) ||
|
|
((char *)namest >= (char *)leaf + XFS_LBSIZE(mp)))) {
|
|
XFS_CORRUPTION_ERROR("xfs_dir_leaf_getdents_int(2)",
|
|
XFS_ERRLEVEL_LOW, mp, leaf);
|
|
xfs_dir_trace_g_du("leaf: corrupted", dp, uio);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
|
|
xfs_dir_trace_g_duc("leaf: middle cookie ",
|
|
dp, uio, p.cook.o);
|
|
|
|
if (i < (INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1)) {
|
|
nexthash = INT_GET(entry[1].hashval, ARCH_CONVERT);
|
|
|
|
if (nexthash == INT_GET(entry->hashval, ARCH_CONVERT))
|
|
nextentno = entno + 1;
|
|
else
|
|
nextentno = 0;
|
|
XFS_PUT_COOKIE(p.cook, mp, bno, nextentno, nexthash);
|
|
xfs_dir_trace_g_duc("leaf: middle cookie ",
|
|
dp, uio, p.cook.o);
|
|
|
|
} else if ((thishash = INT_GET(leaf->hdr.info.forw,
|
|
ARCH_CONVERT))) {
|
|
xfs_dabuf_t *bp2;
|
|
xfs_dir_leafblock_t *leaf2;
|
|
|
|
ASSERT(nextda != -1);
|
|
|
|
retval = xfs_da_read_buf(dp->i_transp, dp, thishash,
|
|
nextda, &bp2, XFS_DATA_FORK);
|
|
if (retval)
|
|
return retval;
|
|
|
|
ASSERT(bp2 != NULL);
|
|
|
|
leaf2 = bp2->data;
|
|
|
|
if (unlikely(
|
|
(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
|
|
!= XFS_DIR_LEAF_MAGIC)
|
|
|| (INT_GET(leaf2->hdr.info.back, ARCH_CONVERT)
|
|
!= bno))) { /* GROT */
|
|
XFS_CORRUPTION_ERROR("xfs_dir_leaf_getdents_int(3)",
|
|
XFS_ERRLEVEL_LOW, mp,
|
|
leaf2);
|
|
xfs_da_brelse(dp->i_transp, bp2);
|
|
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
|
|
nexthash = INT_GET(leaf2->entries[0].hashval,
|
|
ARCH_CONVERT);
|
|
nextentno = -1;
|
|
XFS_PUT_COOKIE(p.cook, mp, thishash, 0, nexthash);
|
|
xfs_da_brelse(dp->i_transp, bp2);
|
|
xfs_dir_trace_g_duc("leaf: next blk cookie",
|
|
dp, uio, p.cook.o);
|
|
} else {
|
|
nextentno = -1;
|
|
XFS_PUT_COOKIE(p.cook, mp, 0, 0, XFS_DA_MAXHASH);
|
|
}
|
|
|
|
/*
|
|
* Save off the cookie so we can fall back should the
|
|
* 'put' into the outgoing buffer fails. To handle a run
|
|
* of equal-hashvals, the off_t structure on 64bit
|
|
* builds has entno built into the cookie to ID the
|
|
* entry. On 32bit builds, we only have space for the
|
|
* hashval so we can't ID specific entries within a group
|
|
* of same hashval entries. For this, lastoffset is set
|
|
* to the first in the run of equal hashvals so we don't
|
|
* include any entries unless we can include all entries
|
|
* that share the same hashval. Hopefully the buffer
|
|
* provided is big enough to handle it (see pv763517).
|
|
*/
|
|
#if (BITS_PER_LONG == 32)
|
|
if ((thishash = INT_GET(entry->hashval, ARCH_CONVERT))
|
|
!= lasthash) {
|
|
XFS_PUT_COOKIE(lastoffset, mp, bno, entno, thishash);
|
|
lastresid = uio->uio_resid;
|
|
lasthash = thishash;
|
|
} else {
|
|
xfs_dir_trace_g_duc("leaf: DUP COOKIES, skipped",
|
|
dp, uio, p.cook.o);
|
|
}
|
|
#else
|
|
thishash = INT_GET(entry->hashval, ARCH_CONVERT);
|
|
XFS_PUT_COOKIE(lastoffset, mp, bno, entno, thishash);
|
|
lastresid = uio->uio_resid;
|
|
#endif /* BITS_PER_LONG == 32 */
|
|
|
|
/*
|
|
* Put the current entry into the outgoing buffer. If we fail
|
|
* then restore the UIO to the first entry in the current
|
|
* run of equal-hashval entries (probably one 1 entry long).
|
|
*/
|
|
p.ino = XFS_GET_DIR_INO8(namest->inumber);
|
|
#if XFS_BIG_INUMS
|
|
p.ino += mp->m_inoadd;
|
|
#endif
|
|
p.name = (char *)namest->name;
|
|
p.namelen = entry->namelen;
|
|
|
|
retval = p.put(&p);
|
|
|
|
if (!p.done) {
|
|
uio->uio_offset = lastoffset.o;
|
|
uio->uio_resid = lastresid;
|
|
|
|
*eobp = 1;
|
|
|
|
xfs_dir_trace_g_du("leaf: E-O-B", dp, uio);
|
|
|
|
return retval;
|
|
}
|
|
}
|
|
|
|
uio->uio_offset = p.cook.o;
|
|
|
|
*eobp = 0;
|
|
|
|
xfs_dir_trace_g_du("leaf: E-O-F", dp, uio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Format a dirent64 structure and copy it out the the user's buffer.
|
|
*/
|
|
int
|
|
xfs_dir_put_dirent64_direct(xfs_dir_put_args_t *pa)
|
|
{
|
|
iovec_t *iovp;
|
|
int reclen, namelen;
|
|
xfs_dirent_t *idbp;
|
|
uio_t *uio;
|
|
|
|
namelen = pa->namelen;
|
|
reclen = DIRENTSIZE(namelen);
|
|
uio = pa->uio;
|
|
if (reclen > uio->uio_resid) {
|
|
pa->done = 0;
|
|
return 0;
|
|
}
|
|
iovp = uio->uio_iov;
|
|
idbp = (xfs_dirent_t *)iovp->iov_base;
|
|
iovp->iov_base = (char *)idbp + reclen;
|
|
iovp->iov_len -= reclen;
|
|
uio->uio_resid -= reclen;
|
|
idbp->d_reclen = reclen;
|
|
idbp->d_ino = pa->ino;
|
|
idbp->d_off = pa->cook.o;
|
|
idbp->d_name[namelen] = '\0';
|
|
pa->done = 1;
|
|
memcpy(idbp->d_name, pa->name, namelen);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Format a dirent64 structure and copy it out the the user's buffer.
|
|
*/
|
|
int
|
|
xfs_dir_put_dirent64_uio(xfs_dir_put_args_t *pa)
|
|
{
|
|
int retval, reclen, namelen;
|
|
xfs_dirent_t *idbp;
|
|
uio_t *uio;
|
|
|
|
namelen = pa->namelen;
|
|
reclen = DIRENTSIZE(namelen);
|
|
uio = pa->uio;
|
|
if (reclen > uio->uio_resid) {
|
|
pa->done = 0;
|
|
return 0;
|
|
}
|
|
idbp = pa->dbp;
|
|
idbp->d_reclen = reclen;
|
|
idbp->d_ino = pa->ino;
|
|
idbp->d_off = pa->cook.o;
|
|
idbp->d_name[namelen] = '\0';
|
|
memcpy(idbp->d_name, pa->name, namelen);
|
|
retval = uio_read((caddr_t)idbp, reclen, uio);
|
|
pa->done = (retval == 0);
|
|
return retval;
|
|
}
|