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![Vlad Apostolov](/assets/img/avatar_default.png)
SGI-PV: 957004 SGI-Modid: xfs-linux-melb:xfs-kern:27231a Signed-off-by: Vlad Apostolov <vapo@sgi.com> Signed-off-by: Tim Shimmin <tes@sgi.com>
764 lines
19 KiB
C
764 lines
19 KiB
C
/*
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* Copyright (c) 2000-2001,2005 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_bit.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_ag.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_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_bmap.h"
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#include "xfs_dir2_data.h"
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#include "xfs_dir2_leaf.h"
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#include "xfs_dir2_block.h"
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#include "xfs_dir2_node.h"
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#include "xfs_dir2_trace.h"
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#include "xfs_error.h"
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static int xfs_dir2_put_dirent64_direct(xfs_dir2_put_args_t *pa);
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static int xfs_dir2_put_dirent64_uio(xfs_dir2_put_args_t *pa);
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void
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xfs_dir_mount(
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xfs_mount_t *mp)
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{
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ASSERT(XFS_SB_VERSION_HASDIRV2(&mp->m_sb));
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ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
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XFS_MAX_BLOCKSIZE);
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mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
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mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
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mp->m_dirdatablk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_DATA_FIRSTDB(mp));
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mp->m_dirleafblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
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mp->m_dirfreeblk = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_FREE_FIRSTDB(mp));
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mp->m_attr_node_ents =
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(mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
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(uint)sizeof(xfs_da_node_entry_t);
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mp->m_dir_node_ents =
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(mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
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(uint)sizeof(xfs_da_node_entry_t);
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mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
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}
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/*
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* Return 1 if directory contains only "." and "..".
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*/
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int
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xfs_dir_isempty(
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xfs_inode_t *dp)
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{
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xfs_dir2_sf_t *sfp;
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ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
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if (dp->i_d.di_size == 0) /* might happen during shutdown. */
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return 1;
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if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
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return 0;
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sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
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return !sfp->hdr.count;
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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(
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xfs_mount_t *mp,
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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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* Initialize a directory with its "." and ".." entries.
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*/
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int
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xfs_dir_init(
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xfs_trans_t *tp,
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xfs_inode_t *dp,
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xfs_inode_t *pdp)
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{
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xfs_da_args_t args;
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int error;
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memset((char *)&args, 0, sizeof(args));
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args.dp = dp;
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args.trans = tp;
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ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
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if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
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return error;
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return xfs_dir2_sf_create(&args, pdp->i_ino);
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}
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/*
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Enter a name in a directory.
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*/
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int
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xfs_dir_createname(
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xfs_trans_t *tp,
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xfs_inode_t *dp,
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char *name,
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int namelen,
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xfs_ino_t inum, /* new entry inode number */
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xfs_fsblock_t *first, /* bmap's firstblock */
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xfs_bmap_free_t *flist, /* bmap's freeblock list */
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xfs_extlen_t total) /* bmap's total block count */
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{
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xfs_da_args_t args;
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int rval;
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int v; /* type-checking value */
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ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
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if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
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return rval;
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XFS_STATS_INC(xs_dir_create);
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args.name = name;
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args.namelen = namelen;
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args.hashval = xfs_da_hashname(name, namelen);
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args.inumber = inum;
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args.dp = dp;
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args.firstblock = first;
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args.flist = flist;
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args.total = total;
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args.whichfork = XFS_DATA_FORK;
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args.trans = tp;
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args.justcheck = 0;
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args.addname = args.oknoent = 1;
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if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
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rval = xfs_dir2_sf_addname(&args);
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else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
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return rval;
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else if (v)
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rval = xfs_dir2_block_addname(&args);
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else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
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return rval;
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else if (v)
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rval = xfs_dir2_leaf_addname(&args);
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else
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rval = xfs_dir2_node_addname(&args);
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return rval;
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}
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/*
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* Lookup a name in a directory, give back the inode number.
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*/
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int
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xfs_dir_lookup(
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xfs_trans_t *tp,
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xfs_inode_t *dp,
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char *name,
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int namelen,
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xfs_ino_t *inum) /* out: inode number */
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{
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xfs_da_args_t args;
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int rval;
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int v; /* type-checking value */
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ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
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XFS_STATS_INC(xs_dir_lookup);
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args.name = name;
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args.namelen = namelen;
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args.hashval = xfs_da_hashname(name, namelen);
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args.inumber = 0;
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args.dp = dp;
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args.firstblock = NULL;
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args.flist = NULL;
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args.total = 0;
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args.whichfork = XFS_DATA_FORK;
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args.trans = tp;
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args.justcheck = args.addname = 0;
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args.oknoent = 1;
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if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
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rval = xfs_dir2_sf_lookup(&args);
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else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
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return rval;
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else if (v)
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rval = xfs_dir2_block_lookup(&args);
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else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
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return rval;
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else if (v)
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rval = xfs_dir2_leaf_lookup(&args);
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else
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rval = xfs_dir2_node_lookup(&args);
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if (rval == EEXIST)
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rval = 0;
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if (rval == 0)
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*inum = args.inumber;
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return rval;
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}
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/*
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* Remove an entry from a directory.
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*/
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int
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xfs_dir_removename(
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xfs_trans_t *tp,
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xfs_inode_t *dp,
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char *name,
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int namelen,
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xfs_ino_t ino,
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xfs_fsblock_t *first, /* bmap's firstblock */
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xfs_bmap_free_t *flist, /* bmap's freeblock list */
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xfs_extlen_t total) /* bmap's total block count */
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{
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xfs_da_args_t args;
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int rval;
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int v; /* type-checking value */
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ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
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XFS_STATS_INC(xs_dir_remove);
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args.name = name;
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args.namelen = namelen;
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args.hashval = xfs_da_hashname(name, namelen);
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args.inumber = ino;
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args.dp = dp;
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args.firstblock = first;
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args.flist = flist;
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args.total = total;
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args.whichfork = XFS_DATA_FORK;
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args.trans = tp;
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args.justcheck = args.addname = args.oknoent = 0;
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if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
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rval = xfs_dir2_sf_removename(&args);
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else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
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return rval;
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else if (v)
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rval = xfs_dir2_block_removename(&args);
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else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
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return rval;
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else if (v)
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rval = xfs_dir2_leaf_removename(&args);
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else
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rval = xfs_dir2_node_removename(&args);
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return rval;
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}
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/*
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* Read a directory.
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*/
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int
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xfs_dir_getdents(
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xfs_trans_t *tp,
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xfs_inode_t *dp,
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uio_t *uio, /* caller's buffer control */
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int *eofp) /* out: eof reached */
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{
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int alignment; /* alignment required for ABI */
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xfs_dirent_t *dbp; /* malloc'ed buffer */
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xfs_dir2_put_t put; /* entry formatting routine */
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int rval; /* return value */
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int v; /* type-checking value */
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ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
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XFS_STATS_INC(xs_dir_getdents);
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/*
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* If our caller has given us a single contiguous aligned memory buffer,
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* just work directly within that buffer. If it's in user memory,
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* lock it down first.
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*/
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alignment = sizeof(xfs_off_t) - 1;
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if ((uio->uio_iovcnt == 1) &&
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(((__psint_t)uio->uio_iov[0].iov_base & alignment) == 0) &&
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((uio->uio_iov[0].iov_len & alignment) == 0)) {
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dbp = NULL;
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put = xfs_dir2_put_dirent64_direct;
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} else {
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dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP);
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put = xfs_dir2_put_dirent64_uio;
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}
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*eofp = 0;
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if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
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rval = xfs_dir2_sf_getdents(dp, uio, eofp, dbp, put);
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else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
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;
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else if (v)
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rval = xfs_dir2_block_getdents(tp, dp, uio, eofp, dbp, put);
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else
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rval = xfs_dir2_leaf_getdents(tp, dp, uio, eofp, dbp, put);
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if (dbp != NULL)
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kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN);
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return rval;
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}
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/*
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* Replace the inode number of a directory entry.
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*/
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int
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xfs_dir_replace(
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xfs_trans_t *tp,
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xfs_inode_t *dp,
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char *name, /* name of entry to replace */
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int namelen,
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xfs_ino_t inum, /* new inode number */
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xfs_fsblock_t *first, /* bmap's firstblock */
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xfs_bmap_free_t *flist, /* bmap's freeblock list */
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xfs_extlen_t total) /* bmap's total block count */
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{
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xfs_da_args_t args;
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int rval;
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int v; /* type-checking value */
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ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
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if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
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return rval;
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args.name = name;
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args.namelen = namelen;
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args.hashval = xfs_da_hashname(name, namelen);
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args.inumber = inum;
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args.dp = dp;
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args.firstblock = first;
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args.flist = flist;
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args.total = total;
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args.whichfork = XFS_DATA_FORK;
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args.trans = tp;
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args.justcheck = args.addname = args.oknoent = 0;
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if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
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rval = xfs_dir2_sf_replace(&args);
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else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
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return rval;
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else if (v)
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rval = xfs_dir2_block_replace(&args);
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else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
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return rval;
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else if (v)
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rval = xfs_dir2_leaf_replace(&args);
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else
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rval = xfs_dir2_node_replace(&args);
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return rval;
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}
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/*
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* See if this entry can be added to the directory without allocating space.
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*/
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int
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xfs_dir_canenter(
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xfs_trans_t *tp,
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xfs_inode_t *dp,
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char *name, /* name of entry to add */
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int namelen)
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{
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xfs_da_args_t args;
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int rval;
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int v; /* type-checking value */
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ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
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args.name = name;
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args.namelen = namelen;
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args.hashval = xfs_da_hashname(name, namelen);
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args.inumber = 0;
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args.dp = dp;
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args.firstblock = NULL;
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args.flist = NULL;
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args.total = 0;
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args.whichfork = XFS_DATA_FORK;
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args.trans = tp;
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args.justcheck = args.addname = args.oknoent = 1;
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if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
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rval = xfs_dir2_sf_addname(&args);
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else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
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return rval;
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else if (v)
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rval = xfs_dir2_block_addname(&args);
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else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
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return rval;
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else if (v)
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rval = xfs_dir2_leaf_addname(&args);
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else
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rval = xfs_dir2_node_addname(&args);
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return rval;
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}
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/*
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* Utility routines.
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*/
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/*
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* Add a block to the directory.
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* This routine is for data and free blocks, not leaf/node blocks
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* which are handled by xfs_da_grow_inode.
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*/
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int
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xfs_dir2_grow_inode(
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xfs_da_args_t *args,
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int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
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xfs_dir2_db_t *dbp) /* out: block number added */
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{
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xfs_fileoff_t bno; /* directory offset of new block */
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int count; /* count of filesystem blocks */
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xfs_inode_t *dp; /* incore directory inode */
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int error;
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int got; /* blocks actually mapped */
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int i;
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xfs_bmbt_irec_t map; /* single structure for bmap */
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int mapi; /* mapping index */
|
|
xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */
|
|
xfs_mount_t *mp;
|
|
int nmap; /* number of bmap entries */
|
|
xfs_trans_t *tp;
|
|
|
|
xfs_dir2_trace_args_s("grow_inode", args, space);
|
|
dp = args->dp;
|
|
tp = args->trans;
|
|
mp = dp->i_mount;
|
|
/*
|
|
* Set lowest possible block in the space requested.
|
|
*/
|
|
bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
|
|
count = mp->m_dirblkfsbs;
|
|
/*
|
|
* Find the first hole for our block.
|
|
*/
|
|
if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
|
|
return error;
|
|
nmap = 1;
|
|
ASSERT(args->firstblock != NULL);
|
|
/*
|
|
* Try mapping the new block contiguously (one extent).
|
|
*/
|
|
if ((error = xfs_bmapi(tp, dp, bno, count,
|
|
XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
|
|
args->firstblock, args->total, &map, &nmap,
|
|
args->flist, NULL)))
|
|
return error;
|
|
ASSERT(nmap <= 1);
|
|
if (nmap == 1) {
|
|
mapp = ↦
|
|
mapi = 1;
|
|
}
|
|
/*
|
|
* Didn't work and this is a multiple-fsb directory block.
|
|
* Try again with contiguous flag turned on.
|
|
*/
|
|
else if (nmap == 0 && count > 1) {
|
|
xfs_fileoff_t b; /* current file offset */
|
|
|
|
/*
|
|
* Space for maximum number of mappings.
|
|
*/
|
|
mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
|
|
/*
|
|
* Iterate until we get to the end of our block.
|
|
*/
|
|
for (b = bno, mapi = 0; b < bno + count; ) {
|
|
int c; /* current fsb count */
|
|
|
|
/*
|
|
* Can't map more than MAX_NMAP at once.
|
|
*/
|
|
nmap = MIN(XFS_BMAP_MAX_NMAP, count);
|
|
c = (int)(bno + count - b);
|
|
if ((error = xfs_bmapi(tp, dp, b, c,
|
|
XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
|
|
args->firstblock, args->total,
|
|
&mapp[mapi], &nmap, args->flist,
|
|
NULL))) {
|
|
kmem_free(mapp, sizeof(*mapp) * count);
|
|
return error;
|
|
}
|
|
if (nmap < 1)
|
|
break;
|
|
/*
|
|
* Add this bunch into our table, go to the next offset.
|
|
*/
|
|
mapi += nmap;
|
|
b = mapp[mapi - 1].br_startoff +
|
|
mapp[mapi - 1].br_blockcount;
|
|
}
|
|
}
|
|
/*
|
|
* Didn't work.
|
|
*/
|
|
else {
|
|
mapi = 0;
|
|
mapp = NULL;
|
|
}
|
|
/*
|
|
* See how many fsb's we got.
|
|
*/
|
|
for (i = 0, got = 0; i < mapi; i++)
|
|
got += mapp[i].br_blockcount;
|
|
/*
|
|
* Didn't get enough fsb's, or the first/last block's are wrong.
|
|
*/
|
|
if (got != count || mapp[0].br_startoff != bno ||
|
|
mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
|
|
bno + count) {
|
|
if (mapp != &map)
|
|
kmem_free(mapp, sizeof(*mapp) * count);
|
|
return XFS_ERROR(ENOSPC);
|
|
}
|
|
/*
|
|
* Done with the temporary mapping table.
|
|
*/
|
|
if (mapp != &map)
|
|
kmem_free(mapp, sizeof(*mapp) * count);
|
|
*dbp = XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)bno);
|
|
/*
|
|
* Update file's size if this is the data space and it grew.
|
|
*/
|
|
if (space == XFS_DIR2_DATA_SPACE) {
|
|
xfs_fsize_t size; /* directory file (data) size */
|
|
|
|
size = XFS_FSB_TO_B(mp, bno + count);
|
|
if (size > dp->i_d.di_size) {
|
|
dp->i_d.di_size = size;
|
|
xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* See if the directory is a single-block form directory.
|
|
*/
|
|
int
|
|
xfs_dir2_isblock(
|
|
xfs_trans_t *tp,
|
|
xfs_inode_t *dp,
|
|
int *vp) /* out: 1 is block, 0 is not block */
|
|
{
|
|
xfs_fileoff_t last; /* last file offset */
|
|
xfs_mount_t *mp;
|
|
int rval;
|
|
|
|
mp = dp->i_mount;
|
|
if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
|
|
return rval;
|
|
rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
|
|
ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
|
|
*vp = rval;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* See if the directory is a single-leaf form directory.
|
|
*/
|
|
int
|
|
xfs_dir2_isleaf(
|
|
xfs_trans_t *tp,
|
|
xfs_inode_t *dp,
|
|
int *vp) /* out: 1 is leaf, 0 is not leaf */
|
|
{
|
|
xfs_fileoff_t last; /* last file offset */
|
|
xfs_mount_t *mp;
|
|
int rval;
|
|
|
|
mp = dp->i_mount;
|
|
if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
|
|
return rval;
|
|
*vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Getdents put routine for 64-bit ABI, direct form.
|
|
*/
|
|
static int
|
|
xfs_dir2_put_dirent64_direct(
|
|
xfs_dir2_put_args_t *pa)
|
|
{
|
|
xfs_dirent_t *idbp; /* dirent pointer */
|
|
iovec_t *iovp; /* io vector */
|
|
int namelen; /* entry name length */
|
|
int reclen; /* entry total length */
|
|
uio_t *uio; /* I/O control */
|
|
|
|
namelen = pa->namelen;
|
|
reclen = DIRENTSIZE(namelen);
|
|
uio = pa->uio;
|
|
/*
|
|
* Won't fit in the remaining space.
|
|
*/
|
|
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;
|
|
idbp->d_name[namelen] = '\0';
|
|
pa->done = 1;
|
|
memcpy(idbp->d_name, pa->name, namelen);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Getdents put routine for 64-bit ABI, uio form.
|
|
*/
|
|
static int
|
|
xfs_dir2_put_dirent64_uio(
|
|
xfs_dir2_put_args_t *pa)
|
|
{
|
|
xfs_dirent_t *idbp; /* dirent pointer */
|
|
int namelen; /* entry name length */
|
|
int reclen; /* entry total length */
|
|
int rval; /* return value */
|
|
uio_t *uio; /* I/O control */
|
|
|
|
namelen = pa->namelen;
|
|
reclen = DIRENTSIZE(namelen);
|
|
uio = pa->uio;
|
|
/*
|
|
* Won't fit in the remaining space.
|
|
*/
|
|
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;
|
|
idbp->d_name[namelen] = '\0';
|
|
memcpy(idbp->d_name, pa->name, namelen);
|
|
rval = xfs_uio_read((caddr_t)idbp, reclen, uio);
|
|
pa->done = (rval == 0);
|
|
return rval;
|
|
}
|
|
|
|
/*
|
|
* Remove the given block from the directory.
|
|
* This routine is used for data and free blocks, leaf/node are done
|
|
* by xfs_da_shrink_inode.
|
|
*/
|
|
int
|
|
xfs_dir2_shrink_inode(
|
|
xfs_da_args_t *args,
|
|
xfs_dir2_db_t db,
|
|
xfs_dabuf_t *bp)
|
|
{
|
|
xfs_fileoff_t bno; /* directory file offset */
|
|
xfs_dablk_t da; /* directory file offset */
|
|
int done; /* bunmap is finished */
|
|
xfs_inode_t *dp;
|
|
int error;
|
|
xfs_mount_t *mp;
|
|
xfs_trans_t *tp;
|
|
|
|
xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
|
|
dp = args->dp;
|
|
mp = dp->i_mount;
|
|
tp = args->trans;
|
|
da = XFS_DIR2_DB_TO_DA(mp, db);
|
|
/*
|
|
* Unmap the fsblock(s).
|
|
*/
|
|
if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
|
|
XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
|
|
NULL, &done))) {
|
|
/*
|
|
* ENOSPC actually can happen if we're in a removename with
|
|
* no space reservation, and the resulting block removal
|
|
* would cause a bmap btree split or conversion from extents
|
|
* to btree. This can only happen for un-fragmented
|
|
* directory blocks, since you need to be punching out
|
|
* the middle of an extent.
|
|
* In this case we need to leave the block in the file,
|
|
* and not binval it.
|
|
* So the block has to be in a consistent empty state
|
|
* and appropriately logged.
|
|
* We don't free up the buffer, the caller can tell it
|
|
* hasn't happened since it got an error back.
|
|
*/
|
|
return error;
|
|
}
|
|
ASSERT(done);
|
|
/*
|
|
* Invalidate the buffer from the transaction.
|
|
*/
|
|
xfs_da_binval(tp, bp);
|
|
/*
|
|
* If it's not a data block, we're done.
|
|
*/
|
|
if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
|
|
return 0;
|
|
/*
|
|
* If the block isn't the last one in the directory, we're done.
|
|
*/
|
|
if (dp->i_d.di_size > XFS_DIR2_DB_OFF_TO_BYTE(mp, db + 1, 0))
|
|
return 0;
|
|
bno = da;
|
|
if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
|
|
/*
|
|
* This can't really happen unless there's kernel corruption.
|
|
*/
|
|
return error;
|
|
}
|
|
if (db == mp->m_dirdatablk)
|
|
ASSERT(bno == 0);
|
|
else
|
|
ASSERT(bno > 0);
|
|
/*
|
|
* Set the size to the new last block.
|
|
*/
|
|
dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
|
|
xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
|
|
return 0;
|
|
}
|