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![Christoph Hellwig](/assets/img/avatar_default.png)
Stop having two different names for many buffer functions and use the more descriptive xfs_buf_* names directly. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
1881 lines
53 KiB
C
1881 lines
53 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_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_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_dir2_sf.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.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_error.h"
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#include "xfs_trace.h"
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/*
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* Local function declarations.
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*/
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#ifdef DEBUG
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static void xfs_dir2_leaf_check(xfs_inode_t *dp, xfs_dabuf_t *bp);
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#else
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#define xfs_dir2_leaf_check(dp, bp)
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#endif
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static int xfs_dir2_leaf_lookup_int(xfs_da_args_t *args, xfs_dabuf_t **lbpp,
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int *indexp, xfs_dabuf_t **dbpp);
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static void xfs_dir2_leaf_log_bests(struct xfs_trans *tp, struct xfs_dabuf *bp,
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int first, int last);
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static void xfs_dir2_leaf_log_tail(struct xfs_trans *tp, struct xfs_dabuf *bp);
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/*
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* Convert a block form directory to a leaf form directory.
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*/
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int /* error */
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xfs_dir2_block_to_leaf(
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xfs_da_args_t *args, /* operation arguments */
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xfs_dabuf_t *dbp) /* input block's buffer */
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{
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__be16 *bestsp; /* leaf's bestsp entries */
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xfs_dablk_t blkno; /* leaf block's bno */
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xfs_dir2_block_t *block; /* block structure */
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xfs_dir2_leaf_entry_t *blp; /* block's leaf entries */
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xfs_dir2_block_tail_t *btp; /* block's tail */
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xfs_inode_t *dp; /* incore directory inode */
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int error; /* error return code */
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xfs_dabuf_t *lbp; /* leaf block's buffer */
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xfs_dir2_db_t ldb; /* leaf block's bno */
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xfs_dir2_leaf_t *leaf; /* leaf structure */
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xfs_dir2_leaf_tail_t *ltp; /* leaf's tail */
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xfs_mount_t *mp; /* filesystem mount point */
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int needlog; /* need to log block header */
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int needscan; /* need to rescan bestfree */
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xfs_trans_t *tp; /* transaction pointer */
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trace_xfs_dir2_block_to_leaf(args);
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dp = args->dp;
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mp = dp->i_mount;
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tp = args->trans;
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/*
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* Add the leaf block to the inode.
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* This interface will only put blocks in the leaf/node range.
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* Since that's empty now, we'll get the root (block 0 in range).
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*/
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if ((error = xfs_da_grow_inode(args, &blkno))) {
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return error;
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}
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ldb = xfs_dir2_da_to_db(mp, blkno);
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ASSERT(ldb == XFS_DIR2_LEAF_FIRSTDB(mp));
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/*
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* Initialize the leaf block, get a buffer for it.
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*/
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if ((error = xfs_dir2_leaf_init(args, ldb, &lbp, XFS_DIR2_LEAF1_MAGIC))) {
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return error;
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}
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ASSERT(lbp != NULL);
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leaf = lbp->data;
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block = dbp->data;
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xfs_dir2_data_check(dp, dbp);
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btp = xfs_dir2_block_tail_p(mp, block);
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blp = xfs_dir2_block_leaf_p(btp);
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/*
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* Set the counts in the leaf header.
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*/
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leaf->hdr.count = cpu_to_be16(be32_to_cpu(btp->count));
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leaf->hdr.stale = cpu_to_be16(be32_to_cpu(btp->stale));
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/*
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* Could compact these but I think we always do the conversion
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* after squeezing out stale entries.
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*/
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memcpy(leaf->ents, blp, be32_to_cpu(btp->count) * sizeof(xfs_dir2_leaf_entry_t));
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xfs_dir2_leaf_log_ents(tp, lbp, 0, be16_to_cpu(leaf->hdr.count) - 1);
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needscan = 0;
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needlog = 1;
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/*
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* Make the space formerly occupied by the leaf entries and block
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* tail be free.
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*/
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xfs_dir2_data_make_free(tp, dbp,
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(xfs_dir2_data_aoff_t)((char *)blp - (char *)block),
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(xfs_dir2_data_aoff_t)((char *)block + mp->m_dirblksize -
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(char *)blp),
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&needlog, &needscan);
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/*
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* Fix up the block header, make it a data block.
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*/
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block->hdr.magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
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if (needscan)
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xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);
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/*
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* Set up leaf tail and bests table.
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*/
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ltp = xfs_dir2_leaf_tail_p(mp, leaf);
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ltp->bestcount = cpu_to_be32(1);
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bestsp = xfs_dir2_leaf_bests_p(ltp);
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bestsp[0] = block->hdr.bestfree[0].length;
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/*
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* Log the data header and leaf bests table.
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*/
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if (needlog)
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xfs_dir2_data_log_header(tp, dbp);
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xfs_dir2_leaf_check(dp, lbp);
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xfs_dir2_data_check(dp, dbp);
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xfs_dir2_leaf_log_bests(tp, lbp, 0, 0);
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xfs_da_buf_done(lbp);
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return 0;
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}
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/*
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* Add an entry to a leaf form directory.
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*/
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int /* error */
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xfs_dir2_leaf_addname(
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xfs_da_args_t *args) /* operation arguments */
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{
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__be16 *bestsp; /* freespace table in leaf */
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int compact; /* need to compact leaves */
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xfs_dir2_data_t *data; /* data block structure */
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xfs_dabuf_t *dbp; /* data block buffer */
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xfs_dir2_data_entry_t *dep; /* data block entry */
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xfs_inode_t *dp; /* incore directory inode */
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xfs_dir2_data_unused_t *dup; /* data unused entry */
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int error; /* error return value */
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int grown; /* allocated new data block */
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int highstale; /* index of next stale leaf */
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int i; /* temporary, index */
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int index; /* leaf table position */
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xfs_dabuf_t *lbp; /* leaf's buffer */
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xfs_dir2_leaf_t *leaf; /* leaf structure */
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int length; /* length of new entry */
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xfs_dir2_leaf_entry_t *lep; /* leaf entry table pointer */
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int lfloglow; /* low leaf logging index */
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int lfloghigh; /* high leaf logging index */
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int lowstale; /* index of prev stale leaf */
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xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */
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xfs_mount_t *mp; /* filesystem mount point */
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int needbytes; /* leaf block bytes needed */
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int needlog; /* need to log data header */
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int needscan; /* need to rescan data free */
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__be16 *tagp; /* end of data entry */
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xfs_trans_t *tp; /* transaction pointer */
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xfs_dir2_db_t use_block; /* data block number */
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trace_xfs_dir2_leaf_addname(args);
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dp = args->dp;
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tp = args->trans;
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mp = dp->i_mount;
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/*
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* Read the leaf block.
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*/
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error = xfs_da_read_buf(tp, dp, mp->m_dirleafblk, -1, &lbp,
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XFS_DATA_FORK);
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if (error) {
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return error;
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}
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ASSERT(lbp != NULL);
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/*
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* Look up the entry by hash value and name.
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* We know it's not there, our caller has already done a lookup.
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* So the index is of the entry to insert in front of.
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* But if there are dup hash values the index is of the first of those.
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*/
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index = xfs_dir2_leaf_search_hash(args, lbp);
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leaf = lbp->data;
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ltp = xfs_dir2_leaf_tail_p(mp, leaf);
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bestsp = xfs_dir2_leaf_bests_p(ltp);
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length = xfs_dir2_data_entsize(args->namelen);
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/*
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* See if there are any entries with the same hash value
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* and space in their block for the new entry.
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* This is good because it puts multiple same-hash value entries
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* in a data block, improving the lookup of those entries.
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*/
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for (use_block = -1, lep = &leaf->ents[index];
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index < be16_to_cpu(leaf->hdr.count) && be32_to_cpu(lep->hashval) == args->hashval;
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index++, lep++) {
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if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
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continue;
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i = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address));
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ASSERT(i < be32_to_cpu(ltp->bestcount));
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ASSERT(be16_to_cpu(bestsp[i]) != NULLDATAOFF);
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if (be16_to_cpu(bestsp[i]) >= length) {
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use_block = i;
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break;
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}
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}
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/*
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* Didn't find a block yet, linear search all the data blocks.
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*/
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if (use_block == -1) {
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for (i = 0; i < be32_to_cpu(ltp->bestcount); i++) {
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/*
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* Remember a block we see that's missing.
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*/
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if (be16_to_cpu(bestsp[i]) == NULLDATAOFF && use_block == -1)
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use_block = i;
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else if (be16_to_cpu(bestsp[i]) >= length) {
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use_block = i;
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break;
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}
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}
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}
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/*
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* How many bytes do we need in the leaf block?
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*/
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needbytes =
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(leaf->hdr.stale ? 0 : (uint)sizeof(leaf->ents[0])) +
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(use_block != -1 ? 0 : (uint)sizeof(leaf->bests[0]));
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/*
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* Now kill use_block if it refers to a missing block, so we
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* can use it as an indication of allocation needed.
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*/
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if (use_block != -1 && be16_to_cpu(bestsp[use_block]) == NULLDATAOFF)
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use_block = -1;
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/*
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* If we don't have enough free bytes but we can make enough
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* by compacting out stale entries, we'll do that.
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*/
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if ((char *)bestsp - (char *)&leaf->ents[be16_to_cpu(leaf->hdr.count)] <
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needbytes && be16_to_cpu(leaf->hdr.stale) > 1) {
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compact = 1;
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}
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/*
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* Otherwise if we don't have enough free bytes we need to
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* convert to node form.
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*/
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else if ((char *)bestsp - (char *)&leaf->ents[be16_to_cpu(
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leaf->hdr.count)] < needbytes) {
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/*
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* Just checking or no space reservation, give up.
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*/
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if ((args->op_flags & XFS_DA_OP_JUSTCHECK) ||
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args->total == 0) {
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xfs_da_brelse(tp, lbp);
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return XFS_ERROR(ENOSPC);
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}
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/*
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* Convert to node form.
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*/
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error = xfs_dir2_leaf_to_node(args, lbp);
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xfs_da_buf_done(lbp);
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if (error)
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return error;
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/*
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* Then add the new entry.
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*/
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return xfs_dir2_node_addname(args);
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}
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/*
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* Otherwise it will fit without compaction.
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*/
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else
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compact = 0;
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/*
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* If just checking, then it will fit unless we needed to allocate
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* a new data block.
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*/
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if (args->op_flags & XFS_DA_OP_JUSTCHECK) {
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xfs_da_brelse(tp, lbp);
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return use_block == -1 ? XFS_ERROR(ENOSPC) : 0;
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}
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/*
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* If no allocations are allowed, return now before we've
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* changed anything.
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*/
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if (args->total == 0 && use_block == -1) {
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xfs_da_brelse(tp, lbp);
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return XFS_ERROR(ENOSPC);
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}
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/*
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* Need to compact the leaf entries, removing stale ones.
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* Leave one stale entry behind - the one closest to our
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* insertion index - and we'll shift that one to our insertion
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* point later.
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*/
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if (compact) {
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xfs_dir2_leaf_compact_x1(lbp, &index, &lowstale, &highstale,
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&lfloglow, &lfloghigh);
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}
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/*
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* There are stale entries, so we'll need log-low and log-high
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* impossibly bad values later.
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*/
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else if (be16_to_cpu(leaf->hdr.stale)) {
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lfloglow = be16_to_cpu(leaf->hdr.count);
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lfloghigh = -1;
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}
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/*
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* If there was no data block space found, we need to allocate
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* a new one.
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*/
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if (use_block == -1) {
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/*
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* Add the new data block.
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*/
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if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE,
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&use_block))) {
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xfs_da_brelse(tp, lbp);
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return error;
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}
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/*
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* Initialize the block.
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*/
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if ((error = xfs_dir2_data_init(args, use_block, &dbp))) {
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xfs_da_brelse(tp, lbp);
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return error;
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}
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/*
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* If we're adding a new data block on the end we need to
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* extend the bests table. Copy it up one entry.
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*/
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if (use_block >= be32_to_cpu(ltp->bestcount)) {
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bestsp--;
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memmove(&bestsp[0], &bestsp[1],
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be32_to_cpu(ltp->bestcount) * sizeof(bestsp[0]));
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be32_add_cpu(<p->bestcount, 1);
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xfs_dir2_leaf_log_tail(tp, lbp);
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xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
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}
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/*
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* If we're filling in a previously empty block just log it.
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*/
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else
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xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block);
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data = dbp->data;
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bestsp[use_block] = data->hdr.bestfree[0].length;
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grown = 1;
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}
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/*
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* Already had space in some data block.
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* Just read that one in.
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*/
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else {
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if ((error =
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xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, use_block),
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-1, &dbp, XFS_DATA_FORK))) {
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xfs_da_brelse(tp, lbp);
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return error;
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}
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data = dbp->data;
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grown = 0;
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}
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xfs_dir2_data_check(dp, dbp);
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/*
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* Point to the biggest freespace in our data block.
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*/
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dup = (xfs_dir2_data_unused_t *)
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((char *)data + be16_to_cpu(data->hdr.bestfree[0].offset));
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ASSERT(be16_to_cpu(dup->length) >= length);
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needscan = needlog = 0;
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/*
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* Mark the initial part of our freespace in use for the new entry.
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*/
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xfs_dir2_data_use_free(tp, dbp, dup,
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(xfs_dir2_data_aoff_t)((char *)dup - (char *)data), length,
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&needlog, &needscan);
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/*
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* Initialize our new entry (at last).
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*/
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dep = (xfs_dir2_data_entry_t *)dup;
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dep->inumber = cpu_to_be64(args->inumber);
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dep->namelen = args->namelen;
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memcpy(dep->name, args->name, dep->namelen);
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tagp = xfs_dir2_data_entry_tag_p(dep);
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*tagp = cpu_to_be16((char *)dep - (char *)data);
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/*
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* Need to scan fix up the bestfree table.
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*/
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if (needscan)
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xfs_dir2_data_freescan(mp, data, &needlog);
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/*
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* Need to log the data block's header.
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*/
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if (needlog)
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xfs_dir2_data_log_header(tp, dbp);
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xfs_dir2_data_log_entry(tp, dbp, dep);
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/*
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* If the bests table needs to be changed, do it.
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* Log the change unless we've already done that.
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*/
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if (be16_to_cpu(bestsp[use_block]) != be16_to_cpu(data->hdr.bestfree[0].length)) {
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bestsp[use_block] = data->hdr.bestfree[0].length;
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if (!grown)
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xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block);
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}
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/*
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* Now we need to make room to insert the leaf entry.
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* If there are no stale entries, we just insert a hole at index.
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*/
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if (!leaf->hdr.stale) {
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/*
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* lep is still good as the index leaf entry.
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*/
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if (index < be16_to_cpu(leaf->hdr.count))
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memmove(lep + 1, lep,
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(be16_to_cpu(leaf->hdr.count) - index) * sizeof(*lep));
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/*
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* Record low and high logging indices for the leaf.
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*/
|
|
lfloglow = index;
|
|
lfloghigh = be16_to_cpu(leaf->hdr.count);
|
|
be16_add_cpu(&leaf->hdr.count, 1);
|
|
}
|
|
/*
|
|
* There are stale entries.
|
|
* We will use one of them for the new entry.
|
|
* It's probably not at the right location, so we'll have to
|
|
* shift some up or down first.
|
|
*/
|
|
else {
|
|
/*
|
|
* If we didn't compact before, we need to find the nearest
|
|
* stale entries before and after our insertion point.
|
|
*/
|
|
if (compact == 0) {
|
|
/*
|
|
* Find the first stale entry before the insertion
|
|
* point, if any.
|
|
*/
|
|
for (lowstale = index - 1;
|
|
lowstale >= 0 &&
|
|
be32_to_cpu(leaf->ents[lowstale].address) !=
|
|
XFS_DIR2_NULL_DATAPTR;
|
|
lowstale--)
|
|
continue;
|
|
/*
|
|
* Find the next stale entry at or after the insertion
|
|
* point, if any. Stop if we go so far that the
|
|
* lowstale entry would be better.
|
|
*/
|
|
for (highstale = index;
|
|
highstale < be16_to_cpu(leaf->hdr.count) &&
|
|
be32_to_cpu(leaf->ents[highstale].address) !=
|
|
XFS_DIR2_NULL_DATAPTR &&
|
|
(lowstale < 0 ||
|
|
index - lowstale - 1 >= highstale - index);
|
|
highstale++)
|
|
continue;
|
|
}
|
|
/*
|
|
* If the low one is better, use it.
|
|
*/
|
|
if (lowstale >= 0 &&
|
|
(highstale == be16_to_cpu(leaf->hdr.count) ||
|
|
index - lowstale - 1 < highstale - index)) {
|
|
ASSERT(index - lowstale - 1 >= 0);
|
|
ASSERT(be32_to_cpu(leaf->ents[lowstale].address) ==
|
|
XFS_DIR2_NULL_DATAPTR);
|
|
/*
|
|
* Copy entries up to cover the stale entry
|
|
* and make room for the new entry.
|
|
*/
|
|
if (index - lowstale - 1 > 0)
|
|
memmove(&leaf->ents[lowstale],
|
|
&leaf->ents[lowstale + 1],
|
|
(index - lowstale - 1) * sizeof(*lep));
|
|
lep = &leaf->ents[index - 1];
|
|
lfloglow = MIN(lowstale, lfloglow);
|
|
lfloghigh = MAX(index - 1, lfloghigh);
|
|
}
|
|
/*
|
|
* The high one is better, so use that one.
|
|
*/
|
|
else {
|
|
ASSERT(highstale - index >= 0);
|
|
ASSERT(be32_to_cpu(leaf->ents[highstale].address) ==
|
|
XFS_DIR2_NULL_DATAPTR);
|
|
/*
|
|
* Copy entries down to cover the stale entry
|
|
* and make room for the new entry.
|
|
*/
|
|
if (highstale - index > 0)
|
|
memmove(&leaf->ents[index + 1],
|
|
&leaf->ents[index],
|
|
(highstale - index) * sizeof(*lep));
|
|
lep = &leaf->ents[index];
|
|
lfloglow = MIN(index, lfloglow);
|
|
lfloghigh = MAX(highstale, lfloghigh);
|
|
}
|
|
be16_add_cpu(&leaf->hdr.stale, -1);
|
|
}
|
|
/*
|
|
* Fill in the new leaf entry.
|
|
*/
|
|
lep->hashval = cpu_to_be32(args->hashval);
|
|
lep->address = cpu_to_be32(xfs_dir2_db_off_to_dataptr(mp, use_block,
|
|
be16_to_cpu(*tagp)));
|
|
/*
|
|
* Log the leaf fields and give up the buffers.
|
|
*/
|
|
xfs_dir2_leaf_log_header(tp, lbp);
|
|
xfs_dir2_leaf_log_ents(tp, lbp, lfloglow, lfloghigh);
|
|
xfs_dir2_leaf_check(dp, lbp);
|
|
xfs_da_buf_done(lbp);
|
|
xfs_dir2_data_check(dp, dbp);
|
|
xfs_da_buf_done(dbp);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
/*
|
|
* Check the internal consistency of a leaf1 block.
|
|
* Pop an assert if something is wrong.
|
|
*/
|
|
STATIC void
|
|
xfs_dir2_leaf_check(
|
|
xfs_inode_t *dp, /* incore directory inode */
|
|
xfs_dabuf_t *bp) /* leaf's buffer */
|
|
{
|
|
int i; /* leaf index */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */
|
|
xfs_mount_t *mp; /* filesystem mount point */
|
|
int stale; /* count of stale leaves */
|
|
|
|
leaf = bp->data;
|
|
mp = dp->i_mount;
|
|
ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC);
|
|
/*
|
|
* This value is not restrictive enough.
|
|
* Should factor in the size of the bests table as well.
|
|
* We can deduce a value for that from di_size.
|
|
*/
|
|
ASSERT(be16_to_cpu(leaf->hdr.count) <= xfs_dir2_max_leaf_ents(mp));
|
|
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
|
|
/*
|
|
* Leaves and bests don't overlap.
|
|
*/
|
|
ASSERT((char *)&leaf->ents[be16_to_cpu(leaf->hdr.count)] <=
|
|
(char *)xfs_dir2_leaf_bests_p(ltp));
|
|
/*
|
|
* Check hash value order, count stale entries.
|
|
*/
|
|
for (i = stale = 0; i < be16_to_cpu(leaf->hdr.count); i++) {
|
|
if (i + 1 < be16_to_cpu(leaf->hdr.count))
|
|
ASSERT(be32_to_cpu(leaf->ents[i].hashval) <=
|
|
be32_to_cpu(leaf->ents[i + 1].hashval));
|
|
if (be32_to_cpu(leaf->ents[i].address) == XFS_DIR2_NULL_DATAPTR)
|
|
stale++;
|
|
}
|
|
ASSERT(be16_to_cpu(leaf->hdr.stale) == stale);
|
|
}
|
|
#endif /* DEBUG */
|
|
|
|
/*
|
|
* Compact out any stale entries in the leaf.
|
|
* Log the header and changed leaf entries, if any.
|
|
*/
|
|
void
|
|
xfs_dir2_leaf_compact(
|
|
xfs_da_args_t *args, /* operation arguments */
|
|
xfs_dabuf_t *bp) /* leaf buffer */
|
|
{
|
|
int from; /* source leaf index */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
int loglow; /* first leaf entry to log */
|
|
int to; /* target leaf index */
|
|
|
|
leaf = bp->data;
|
|
if (!leaf->hdr.stale) {
|
|
return;
|
|
}
|
|
/*
|
|
* Compress out the stale entries in place.
|
|
*/
|
|
for (from = to = 0, loglow = -1; from < be16_to_cpu(leaf->hdr.count); from++) {
|
|
if (be32_to_cpu(leaf->ents[from].address) == XFS_DIR2_NULL_DATAPTR)
|
|
continue;
|
|
/*
|
|
* Only actually copy the entries that are different.
|
|
*/
|
|
if (from > to) {
|
|
if (loglow == -1)
|
|
loglow = to;
|
|
leaf->ents[to] = leaf->ents[from];
|
|
}
|
|
to++;
|
|
}
|
|
/*
|
|
* Update and log the header, log the leaf entries.
|
|
*/
|
|
ASSERT(be16_to_cpu(leaf->hdr.stale) == from - to);
|
|
be16_add_cpu(&leaf->hdr.count, -(be16_to_cpu(leaf->hdr.stale)));
|
|
leaf->hdr.stale = 0;
|
|
xfs_dir2_leaf_log_header(args->trans, bp);
|
|
if (loglow != -1)
|
|
xfs_dir2_leaf_log_ents(args->trans, bp, loglow, to - 1);
|
|
}
|
|
|
|
/*
|
|
* Compact the leaf entries, removing stale ones.
|
|
* Leave one stale entry behind - the one closest to our
|
|
* insertion index - and the caller will shift that one to our insertion
|
|
* point later.
|
|
* Return new insertion index, where the remaining stale entry is,
|
|
* and leaf logging indices.
|
|
*/
|
|
void
|
|
xfs_dir2_leaf_compact_x1(
|
|
xfs_dabuf_t *bp, /* leaf buffer */
|
|
int *indexp, /* insertion index */
|
|
int *lowstalep, /* out: stale entry before us */
|
|
int *highstalep, /* out: stale entry after us */
|
|
int *lowlogp, /* out: low log index */
|
|
int *highlogp) /* out: high log index */
|
|
{
|
|
int from; /* source copy index */
|
|
int highstale; /* stale entry at/after index */
|
|
int index; /* insertion index */
|
|
int keepstale; /* source index of kept stale */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
int lowstale; /* stale entry before index */
|
|
int newindex=0; /* new insertion index */
|
|
int to; /* destination copy index */
|
|
|
|
leaf = bp->data;
|
|
ASSERT(be16_to_cpu(leaf->hdr.stale) > 1);
|
|
index = *indexp;
|
|
/*
|
|
* Find the first stale entry before our index, if any.
|
|
*/
|
|
for (lowstale = index - 1;
|
|
lowstale >= 0 &&
|
|
be32_to_cpu(leaf->ents[lowstale].address) != XFS_DIR2_NULL_DATAPTR;
|
|
lowstale--)
|
|
continue;
|
|
/*
|
|
* Find the first stale entry at or after our index, if any.
|
|
* Stop if the answer would be worse than lowstale.
|
|
*/
|
|
for (highstale = index;
|
|
highstale < be16_to_cpu(leaf->hdr.count) &&
|
|
be32_to_cpu(leaf->ents[highstale].address) != XFS_DIR2_NULL_DATAPTR &&
|
|
(lowstale < 0 || index - lowstale > highstale - index);
|
|
highstale++)
|
|
continue;
|
|
/*
|
|
* Pick the better of lowstale and highstale.
|
|
*/
|
|
if (lowstale >= 0 &&
|
|
(highstale == be16_to_cpu(leaf->hdr.count) ||
|
|
index - lowstale <= highstale - index))
|
|
keepstale = lowstale;
|
|
else
|
|
keepstale = highstale;
|
|
/*
|
|
* Copy the entries in place, removing all the stale entries
|
|
* except keepstale.
|
|
*/
|
|
for (from = to = 0; from < be16_to_cpu(leaf->hdr.count); from++) {
|
|
/*
|
|
* Notice the new value of index.
|
|
*/
|
|
if (index == from)
|
|
newindex = to;
|
|
if (from != keepstale &&
|
|
be32_to_cpu(leaf->ents[from].address) == XFS_DIR2_NULL_DATAPTR) {
|
|
if (from == to)
|
|
*lowlogp = to;
|
|
continue;
|
|
}
|
|
/*
|
|
* Record the new keepstale value for the insertion.
|
|
*/
|
|
if (from == keepstale)
|
|
lowstale = highstale = to;
|
|
/*
|
|
* Copy only the entries that have moved.
|
|
*/
|
|
if (from > to)
|
|
leaf->ents[to] = leaf->ents[from];
|
|
to++;
|
|
}
|
|
ASSERT(from > to);
|
|
/*
|
|
* If the insertion point was past the last entry,
|
|
* set the new insertion point accordingly.
|
|
*/
|
|
if (index == from)
|
|
newindex = to;
|
|
*indexp = newindex;
|
|
/*
|
|
* Adjust the leaf header values.
|
|
*/
|
|
be16_add_cpu(&leaf->hdr.count, -(from - to));
|
|
leaf->hdr.stale = cpu_to_be16(1);
|
|
/*
|
|
* Remember the low/high stale value only in the "right"
|
|
* direction.
|
|
*/
|
|
if (lowstale >= newindex)
|
|
lowstale = -1;
|
|
else
|
|
highstale = be16_to_cpu(leaf->hdr.count);
|
|
*highlogp = be16_to_cpu(leaf->hdr.count) - 1;
|
|
*lowstalep = lowstale;
|
|
*highstalep = highstale;
|
|
}
|
|
|
|
/*
|
|
* Getdents (readdir) for leaf and node directories.
|
|
* This reads the data blocks only, so is the same for both forms.
|
|
*/
|
|
int /* error */
|
|
xfs_dir2_leaf_getdents(
|
|
xfs_inode_t *dp, /* incore directory inode */
|
|
void *dirent,
|
|
size_t bufsize,
|
|
xfs_off_t *offset,
|
|
filldir_t filldir)
|
|
{
|
|
xfs_dabuf_t *bp; /* data block buffer */
|
|
int byteoff; /* offset in current block */
|
|
xfs_dir2_db_t curdb; /* db for current block */
|
|
xfs_dir2_off_t curoff; /* current overall offset */
|
|
xfs_dir2_data_t *data; /* data block structure */
|
|
xfs_dir2_data_entry_t *dep; /* data entry */
|
|
xfs_dir2_data_unused_t *dup; /* unused entry */
|
|
int error = 0; /* error return value */
|
|
int i; /* temporary loop index */
|
|
int j; /* temporary loop index */
|
|
int length; /* temporary length value */
|
|
xfs_bmbt_irec_t *map; /* map vector for blocks */
|
|
xfs_extlen_t map_blocks; /* number of fsbs in map */
|
|
xfs_dablk_t map_off; /* last mapped file offset */
|
|
int map_size; /* total entries in *map */
|
|
int map_valid; /* valid entries in *map */
|
|
xfs_mount_t *mp; /* filesystem mount point */
|
|
xfs_dir2_off_t newoff; /* new curoff after new blk */
|
|
int nmap; /* mappings to ask xfs_bmapi */
|
|
char *ptr = NULL; /* pointer to current data */
|
|
int ra_current; /* number of read-ahead blks */
|
|
int ra_index; /* *map index for read-ahead */
|
|
int ra_offset; /* map entry offset for ra */
|
|
int ra_want; /* readahead count wanted */
|
|
|
|
/*
|
|
* If the offset is at or past the largest allowed value,
|
|
* give up right away.
|
|
*/
|
|
if (*offset >= XFS_DIR2_MAX_DATAPTR)
|
|
return 0;
|
|
|
|
mp = dp->i_mount;
|
|
|
|
/*
|
|
* Set up to bmap a number of blocks based on the caller's
|
|
* buffer size, the directory block size, and the filesystem
|
|
* block size.
|
|
*/
|
|
map_size = howmany(bufsize + mp->m_dirblksize, mp->m_sb.sb_blocksize);
|
|
map = kmem_alloc(map_size * sizeof(*map), KM_SLEEP);
|
|
map_valid = ra_index = ra_offset = ra_current = map_blocks = 0;
|
|
bp = NULL;
|
|
|
|
/*
|
|
* Inside the loop we keep the main offset value as a byte offset
|
|
* in the directory file.
|
|
*/
|
|
curoff = xfs_dir2_dataptr_to_byte(mp, *offset);
|
|
|
|
/*
|
|
* Force this conversion through db so we truncate the offset
|
|
* down to get the start of the data block.
|
|
*/
|
|
map_off = xfs_dir2_db_to_da(mp, xfs_dir2_byte_to_db(mp, curoff));
|
|
/*
|
|
* Loop over directory entries until we reach the end offset.
|
|
* Get more blocks and readahead as necessary.
|
|
*/
|
|
while (curoff < XFS_DIR2_LEAF_OFFSET) {
|
|
/*
|
|
* If we have no buffer, or we're off the end of the
|
|
* current buffer, need to get another one.
|
|
*/
|
|
if (!bp || ptr >= (char *)bp->data + mp->m_dirblksize) {
|
|
/*
|
|
* If we have a buffer, we need to release it and
|
|
* take it out of the mapping.
|
|
*/
|
|
if (bp) {
|
|
xfs_da_brelse(NULL, bp);
|
|
bp = NULL;
|
|
map_blocks -= mp->m_dirblkfsbs;
|
|
/*
|
|
* Loop to get rid of the extents for the
|
|
* directory block.
|
|
*/
|
|
for (i = mp->m_dirblkfsbs; i > 0; ) {
|
|
j = MIN((int)map->br_blockcount, i);
|
|
map->br_blockcount -= j;
|
|
map->br_startblock += j;
|
|
map->br_startoff += j;
|
|
/*
|
|
* If mapping is done, pitch it from
|
|
* the table.
|
|
*/
|
|
if (!map->br_blockcount && --map_valid)
|
|
memmove(&map[0], &map[1],
|
|
sizeof(map[0]) *
|
|
map_valid);
|
|
i -= j;
|
|
}
|
|
}
|
|
/*
|
|
* Recalculate the readahead blocks wanted.
|
|
*/
|
|
ra_want = howmany(bufsize + mp->m_dirblksize,
|
|
mp->m_sb.sb_blocksize) - 1;
|
|
ASSERT(ra_want >= 0);
|
|
|
|
/*
|
|
* If we don't have as many as we want, and we haven't
|
|
* run out of data blocks, get some more mappings.
|
|
*/
|
|
if (1 + ra_want > map_blocks &&
|
|
map_off <
|
|
xfs_dir2_byte_to_da(mp, XFS_DIR2_LEAF_OFFSET)) {
|
|
/*
|
|
* Get more bmaps, fill in after the ones
|
|
* we already have in the table.
|
|
*/
|
|
nmap = map_size - map_valid;
|
|
error = xfs_bmapi(NULL, dp,
|
|
map_off,
|
|
xfs_dir2_byte_to_da(mp,
|
|
XFS_DIR2_LEAF_OFFSET) - map_off,
|
|
XFS_BMAPI_METADATA, NULL, 0,
|
|
&map[map_valid], &nmap, NULL);
|
|
/*
|
|
* Don't know if we should ignore this or
|
|
* try to return an error.
|
|
* The trouble with returning errors
|
|
* is that readdir will just stop without
|
|
* actually passing the error through.
|
|
*/
|
|
if (error)
|
|
break; /* XXX */
|
|
/*
|
|
* If we got all the mappings we asked for,
|
|
* set the final map offset based on the
|
|
* last bmap value received.
|
|
* Otherwise, we've reached the end.
|
|
*/
|
|
if (nmap == map_size - map_valid)
|
|
map_off =
|
|
map[map_valid + nmap - 1].br_startoff +
|
|
map[map_valid + nmap - 1].br_blockcount;
|
|
else
|
|
map_off =
|
|
xfs_dir2_byte_to_da(mp,
|
|
XFS_DIR2_LEAF_OFFSET);
|
|
/*
|
|
* Look for holes in the mapping, and
|
|
* eliminate them. Count up the valid blocks.
|
|
*/
|
|
for (i = map_valid; i < map_valid + nmap; ) {
|
|
if (map[i].br_startblock ==
|
|
HOLESTARTBLOCK) {
|
|
nmap--;
|
|
length = map_valid + nmap - i;
|
|
if (length)
|
|
memmove(&map[i],
|
|
&map[i + 1],
|
|
sizeof(map[i]) *
|
|
length);
|
|
} else {
|
|
map_blocks +=
|
|
map[i].br_blockcount;
|
|
i++;
|
|
}
|
|
}
|
|
map_valid += nmap;
|
|
}
|
|
/*
|
|
* No valid mappings, so no more data blocks.
|
|
*/
|
|
if (!map_valid) {
|
|
curoff = xfs_dir2_da_to_byte(mp, map_off);
|
|
break;
|
|
}
|
|
/*
|
|
* Read the directory block starting at the first
|
|
* mapping.
|
|
*/
|
|
curdb = xfs_dir2_da_to_db(mp, map->br_startoff);
|
|
error = xfs_da_read_buf(NULL, dp, map->br_startoff,
|
|
map->br_blockcount >= mp->m_dirblkfsbs ?
|
|
XFS_FSB_TO_DADDR(mp, map->br_startblock) :
|
|
-1,
|
|
&bp, XFS_DATA_FORK);
|
|
/*
|
|
* Should just skip over the data block instead
|
|
* of giving up.
|
|
*/
|
|
if (error)
|
|
break; /* XXX */
|
|
/*
|
|
* Adjust the current amount of read-ahead: we just
|
|
* read a block that was previously ra.
|
|
*/
|
|
if (ra_current)
|
|
ra_current -= mp->m_dirblkfsbs;
|
|
/*
|
|
* Do we need more readahead?
|
|
*/
|
|
for (ra_index = ra_offset = i = 0;
|
|
ra_want > ra_current && i < map_blocks;
|
|
i += mp->m_dirblkfsbs) {
|
|
ASSERT(ra_index < map_valid);
|
|
/*
|
|
* Read-ahead a contiguous directory block.
|
|
*/
|
|
if (i > ra_current &&
|
|
map[ra_index].br_blockcount >=
|
|
mp->m_dirblkfsbs) {
|
|
xfs_buf_readahead(mp->m_ddev_targp,
|
|
XFS_FSB_TO_DADDR(mp,
|
|
map[ra_index].br_startblock +
|
|
ra_offset),
|
|
(int)BTOBB(mp->m_dirblksize));
|
|
ra_current = i;
|
|
}
|
|
/*
|
|
* Read-ahead a non-contiguous directory block.
|
|
* This doesn't use our mapping, but this
|
|
* is a very rare case.
|
|
*/
|
|
else if (i > ra_current) {
|
|
(void)xfs_da_reada_buf(NULL, dp,
|
|
map[ra_index].br_startoff +
|
|
ra_offset, XFS_DATA_FORK);
|
|
ra_current = i;
|
|
}
|
|
/*
|
|
* Advance offset through the mapping table.
|
|
*/
|
|
for (j = 0; j < mp->m_dirblkfsbs; j++) {
|
|
/*
|
|
* The rest of this extent but not
|
|
* more than a dir block.
|
|
*/
|
|
length = MIN(mp->m_dirblkfsbs,
|
|
(int)(map[ra_index].br_blockcount -
|
|
ra_offset));
|
|
j += length;
|
|
ra_offset += length;
|
|
/*
|
|
* Advance to the next mapping if
|
|
* this one is used up.
|
|
*/
|
|
if (ra_offset ==
|
|
map[ra_index].br_blockcount) {
|
|
ra_offset = 0;
|
|
ra_index++;
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* Having done a read, we need to set a new offset.
|
|
*/
|
|
newoff = xfs_dir2_db_off_to_byte(mp, curdb, 0);
|
|
/*
|
|
* Start of the current block.
|
|
*/
|
|
if (curoff < newoff)
|
|
curoff = newoff;
|
|
/*
|
|
* Make sure we're in the right block.
|
|
*/
|
|
else if (curoff > newoff)
|
|
ASSERT(xfs_dir2_byte_to_db(mp, curoff) ==
|
|
curdb);
|
|
data = bp->data;
|
|
xfs_dir2_data_check(dp, bp);
|
|
/*
|
|
* Find our position in the block.
|
|
*/
|
|
ptr = (char *)&data->u;
|
|
byteoff = xfs_dir2_byte_to_off(mp, curoff);
|
|
/*
|
|
* Skip past the header.
|
|
*/
|
|
if (byteoff == 0)
|
|
curoff += (uint)sizeof(data->hdr);
|
|
/*
|
|
* Skip past entries until we reach our offset.
|
|
*/
|
|
else {
|
|
while ((char *)ptr - (char *)data < byteoff) {
|
|
dup = (xfs_dir2_data_unused_t *)ptr;
|
|
|
|
if (be16_to_cpu(dup->freetag)
|
|
== XFS_DIR2_DATA_FREE_TAG) {
|
|
|
|
length = be16_to_cpu(dup->length);
|
|
ptr += length;
|
|
continue;
|
|
}
|
|
dep = (xfs_dir2_data_entry_t *)ptr;
|
|
length =
|
|
xfs_dir2_data_entsize(dep->namelen);
|
|
ptr += length;
|
|
}
|
|
/*
|
|
* Now set our real offset.
|
|
*/
|
|
curoff =
|
|
xfs_dir2_db_off_to_byte(mp,
|
|
xfs_dir2_byte_to_db(mp, curoff),
|
|
(char *)ptr - (char *)data);
|
|
if (ptr >= (char *)data + mp->m_dirblksize) {
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* We have a pointer to an entry.
|
|
* Is it a live one?
|
|
*/
|
|
dup = (xfs_dir2_data_unused_t *)ptr;
|
|
/*
|
|
* No, it's unused, skip over it.
|
|
*/
|
|
if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
|
|
length = be16_to_cpu(dup->length);
|
|
ptr += length;
|
|
curoff += length;
|
|
continue;
|
|
}
|
|
|
|
dep = (xfs_dir2_data_entry_t *)ptr;
|
|
length = xfs_dir2_data_entsize(dep->namelen);
|
|
|
|
if (filldir(dirent, (char *)dep->name, dep->namelen,
|
|
xfs_dir2_byte_to_dataptr(mp, curoff) & 0x7fffffff,
|
|
be64_to_cpu(dep->inumber), DT_UNKNOWN))
|
|
break;
|
|
|
|
/*
|
|
* Advance to next entry in the block.
|
|
*/
|
|
ptr += length;
|
|
curoff += length;
|
|
/* bufsize may have just been a guess; don't go negative */
|
|
bufsize = bufsize > length ? bufsize - length : 0;
|
|
}
|
|
|
|
/*
|
|
* All done. Set output offset value to current offset.
|
|
*/
|
|
if (curoff > xfs_dir2_dataptr_to_byte(mp, XFS_DIR2_MAX_DATAPTR))
|
|
*offset = XFS_DIR2_MAX_DATAPTR & 0x7fffffff;
|
|
else
|
|
*offset = xfs_dir2_byte_to_dataptr(mp, curoff) & 0x7fffffff;
|
|
kmem_free(map);
|
|
if (bp)
|
|
xfs_da_brelse(NULL, bp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Initialize a new leaf block, leaf1 or leafn magic accepted.
|
|
*/
|
|
int
|
|
xfs_dir2_leaf_init(
|
|
xfs_da_args_t *args, /* operation arguments */
|
|
xfs_dir2_db_t bno, /* directory block number */
|
|
xfs_dabuf_t **bpp, /* out: leaf buffer */
|
|
int magic) /* magic number for block */
|
|
{
|
|
xfs_dabuf_t *bp; /* leaf buffer */
|
|
xfs_inode_t *dp; /* incore directory inode */
|
|
int error; /* error return code */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
|
|
xfs_mount_t *mp; /* filesystem mount point */
|
|
xfs_trans_t *tp; /* transaction pointer */
|
|
|
|
dp = args->dp;
|
|
ASSERT(dp != NULL);
|
|
tp = args->trans;
|
|
mp = dp->i_mount;
|
|
ASSERT(bno >= XFS_DIR2_LEAF_FIRSTDB(mp) &&
|
|
bno < XFS_DIR2_FREE_FIRSTDB(mp));
|
|
/*
|
|
* Get the buffer for the block.
|
|
*/
|
|
error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, bno), -1, &bp,
|
|
XFS_DATA_FORK);
|
|
if (error) {
|
|
return error;
|
|
}
|
|
ASSERT(bp != NULL);
|
|
leaf = bp->data;
|
|
/*
|
|
* Initialize the header.
|
|
*/
|
|
leaf->hdr.info.magic = cpu_to_be16(magic);
|
|
leaf->hdr.info.forw = 0;
|
|
leaf->hdr.info.back = 0;
|
|
leaf->hdr.count = 0;
|
|
leaf->hdr.stale = 0;
|
|
xfs_dir2_leaf_log_header(tp, bp);
|
|
/*
|
|
* If it's a leaf-format directory initialize the tail.
|
|
* In this case our caller has the real bests table to copy into
|
|
* the block.
|
|
*/
|
|
if (magic == XFS_DIR2_LEAF1_MAGIC) {
|
|
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
|
|
ltp->bestcount = 0;
|
|
xfs_dir2_leaf_log_tail(tp, bp);
|
|
}
|
|
*bpp = bp;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Log the bests entries indicated from a leaf1 block.
|
|
*/
|
|
static void
|
|
xfs_dir2_leaf_log_bests(
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
xfs_dabuf_t *bp, /* leaf buffer */
|
|
int first, /* first entry to log */
|
|
int last) /* last entry to log */
|
|
{
|
|
__be16 *firstb; /* pointer to first entry */
|
|
__be16 *lastb; /* pointer to last entry */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
|
|
|
|
leaf = bp->data;
|
|
ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC);
|
|
ltp = xfs_dir2_leaf_tail_p(tp->t_mountp, leaf);
|
|
firstb = xfs_dir2_leaf_bests_p(ltp) + first;
|
|
lastb = xfs_dir2_leaf_bests_p(ltp) + last;
|
|
xfs_da_log_buf(tp, bp, (uint)((char *)firstb - (char *)leaf),
|
|
(uint)((char *)lastb - (char *)leaf + sizeof(*lastb) - 1));
|
|
}
|
|
|
|
/*
|
|
* Log the leaf entries indicated from a leaf1 or leafn block.
|
|
*/
|
|
void
|
|
xfs_dir2_leaf_log_ents(
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
xfs_dabuf_t *bp, /* leaf buffer */
|
|
int first, /* first entry to log */
|
|
int last) /* last entry to log */
|
|
{
|
|
xfs_dir2_leaf_entry_t *firstlep; /* pointer to first entry */
|
|
xfs_dir2_leaf_entry_t *lastlep; /* pointer to last entry */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
|
|
leaf = bp->data;
|
|
ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC ||
|
|
be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC);
|
|
firstlep = &leaf->ents[first];
|
|
lastlep = &leaf->ents[last];
|
|
xfs_da_log_buf(tp, bp, (uint)((char *)firstlep - (char *)leaf),
|
|
(uint)((char *)lastlep - (char *)leaf + sizeof(*lastlep) - 1));
|
|
}
|
|
|
|
/*
|
|
* Log the header of the leaf1 or leafn block.
|
|
*/
|
|
void
|
|
xfs_dir2_leaf_log_header(
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
xfs_dabuf_t *bp) /* leaf buffer */
|
|
{
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
|
|
leaf = bp->data;
|
|
ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC ||
|
|
be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC);
|
|
xfs_da_log_buf(tp, bp, (uint)((char *)&leaf->hdr - (char *)leaf),
|
|
(uint)(sizeof(leaf->hdr) - 1));
|
|
}
|
|
|
|
/*
|
|
* Log the tail of the leaf1 block.
|
|
*/
|
|
STATIC void
|
|
xfs_dir2_leaf_log_tail(
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
xfs_dabuf_t *bp) /* leaf buffer */
|
|
{
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
|
|
xfs_mount_t *mp; /* filesystem mount point */
|
|
|
|
mp = tp->t_mountp;
|
|
leaf = bp->data;
|
|
ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC);
|
|
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
|
|
xfs_da_log_buf(tp, bp, (uint)((char *)ltp - (char *)leaf),
|
|
(uint)(mp->m_dirblksize - 1));
|
|
}
|
|
|
|
/*
|
|
* Look up the entry referred to by args in the leaf format directory.
|
|
* Most of the work is done by the xfs_dir2_leaf_lookup_int routine which
|
|
* is also used by the node-format code.
|
|
*/
|
|
int
|
|
xfs_dir2_leaf_lookup(
|
|
xfs_da_args_t *args) /* operation arguments */
|
|
{
|
|
xfs_dabuf_t *dbp; /* data block buffer */
|
|
xfs_dir2_data_entry_t *dep; /* data block entry */
|
|
xfs_inode_t *dp; /* incore directory inode */
|
|
int error; /* error return code */
|
|
int index; /* found entry index */
|
|
xfs_dabuf_t *lbp; /* leaf buffer */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
|
|
xfs_trans_t *tp; /* transaction pointer */
|
|
|
|
trace_xfs_dir2_leaf_lookup(args);
|
|
|
|
/*
|
|
* Look up name in the leaf block, returning both buffers and index.
|
|
*/
|
|
if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
|
|
return error;
|
|
}
|
|
tp = args->trans;
|
|
dp = args->dp;
|
|
xfs_dir2_leaf_check(dp, lbp);
|
|
leaf = lbp->data;
|
|
/*
|
|
* Get to the leaf entry and contained data entry address.
|
|
*/
|
|
lep = &leaf->ents[index];
|
|
/*
|
|
* Point to the data entry.
|
|
*/
|
|
dep = (xfs_dir2_data_entry_t *)
|
|
((char *)dbp->data +
|
|
xfs_dir2_dataptr_to_off(dp->i_mount, be32_to_cpu(lep->address)));
|
|
/*
|
|
* Return the found inode number & CI name if appropriate
|
|
*/
|
|
args->inumber = be64_to_cpu(dep->inumber);
|
|
error = xfs_dir_cilookup_result(args, dep->name, dep->namelen);
|
|
xfs_da_brelse(tp, dbp);
|
|
xfs_da_brelse(tp, lbp);
|
|
return XFS_ERROR(error);
|
|
}
|
|
|
|
/*
|
|
* Look up name/hash in the leaf block.
|
|
* Fill in indexp with the found index, and dbpp with the data buffer.
|
|
* If not found dbpp will be NULL, and ENOENT comes back.
|
|
* lbpp will always be filled in with the leaf buffer unless there's an error.
|
|
*/
|
|
static int /* error */
|
|
xfs_dir2_leaf_lookup_int(
|
|
xfs_da_args_t *args, /* operation arguments */
|
|
xfs_dabuf_t **lbpp, /* out: leaf buffer */
|
|
int *indexp, /* out: index in leaf block */
|
|
xfs_dabuf_t **dbpp) /* out: data buffer */
|
|
{
|
|
xfs_dir2_db_t curdb = -1; /* current data block number */
|
|
xfs_dabuf_t *dbp = NULL; /* data buffer */
|
|
xfs_dir2_data_entry_t *dep; /* data entry */
|
|
xfs_inode_t *dp; /* incore directory inode */
|
|
int error; /* error return code */
|
|
int index; /* index in leaf block */
|
|
xfs_dabuf_t *lbp; /* leaf buffer */
|
|
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
xfs_mount_t *mp; /* filesystem mount point */
|
|
xfs_dir2_db_t newdb; /* new data block number */
|
|
xfs_trans_t *tp; /* transaction pointer */
|
|
xfs_dir2_db_t cidb = -1; /* case match data block no. */
|
|
enum xfs_dacmp cmp; /* name compare result */
|
|
|
|
dp = args->dp;
|
|
tp = args->trans;
|
|
mp = dp->i_mount;
|
|
/*
|
|
* Read the leaf block into the buffer.
|
|
*/
|
|
error = xfs_da_read_buf(tp, dp, mp->m_dirleafblk, -1, &lbp,
|
|
XFS_DATA_FORK);
|
|
if (error)
|
|
return error;
|
|
*lbpp = lbp;
|
|
leaf = lbp->data;
|
|
xfs_dir2_leaf_check(dp, lbp);
|
|
/*
|
|
* Look for the first leaf entry with our hash value.
|
|
*/
|
|
index = xfs_dir2_leaf_search_hash(args, lbp);
|
|
/*
|
|
* Loop over all the entries with the right hash value
|
|
* looking to match the name.
|
|
*/
|
|
for (lep = &leaf->ents[index]; index < be16_to_cpu(leaf->hdr.count) &&
|
|
be32_to_cpu(lep->hashval) == args->hashval;
|
|
lep++, index++) {
|
|
/*
|
|
* Skip over stale leaf entries.
|
|
*/
|
|
if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
|
|
continue;
|
|
/*
|
|
* Get the new data block number.
|
|
*/
|
|
newdb = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address));
|
|
/*
|
|
* If it's not the same as the old data block number,
|
|
* need to pitch the old one and read the new one.
|
|
*/
|
|
if (newdb != curdb) {
|
|
if (dbp)
|
|
xfs_da_brelse(tp, dbp);
|
|
error = xfs_da_read_buf(tp, dp,
|
|
xfs_dir2_db_to_da(mp, newdb),
|
|
-1, &dbp, XFS_DATA_FORK);
|
|
if (error) {
|
|
xfs_da_brelse(tp, lbp);
|
|
return error;
|
|
}
|
|
xfs_dir2_data_check(dp, dbp);
|
|
curdb = newdb;
|
|
}
|
|
/*
|
|
* Point to the data entry.
|
|
*/
|
|
dep = (xfs_dir2_data_entry_t *)((char *)dbp->data +
|
|
xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)));
|
|
/*
|
|
* Compare name and if it's an exact match, return the index
|
|
* and buffer. If it's the first case-insensitive match, store
|
|
* the index and buffer and continue looking for an exact match.
|
|
*/
|
|
cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen);
|
|
if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
|
|
args->cmpresult = cmp;
|
|
*indexp = index;
|
|
/* case exact match: return the current buffer. */
|
|
if (cmp == XFS_CMP_EXACT) {
|
|
*dbpp = dbp;
|
|
return 0;
|
|
}
|
|
cidb = curdb;
|
|
}
|
|
}
|
|
ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
|
|
/*
|
|
* Here, we can only be doing a lookup (not a rename or remove).
|
|
* If a case-insensitive match was found earlier, re-read the
|
|
* appropriate data block if required and return it.
|
|
*/
|
|
if (args->cmpresult == XFS_CMP_CASE) {
|
|
ASSERT(cidb != -1);
|
|
if (cidb != curdb) {
|
|
xfs_da_brelse(tp, dbp);
|
|
error = xfs_da_read_buf(tp, dp,
|
|
xfs_dir2_db_to_da(mp, cidb),
|
|
-1, &dbp, XFS_DATA_FORK);
|
|
if (error) {
|
|
xfs_da_brelse(tp, lbp);
|
|
return error;
|
|
}
|
|
}
|
|
*dbpp = dbp;
|
|
return 0;
|
|
}
|
|
/*
|
|
* No match found, return ENOENT.
|
|
*/
|
|
ASSERT(cidb == -1);
|
|
if (dbp)
|
|
xfs_da_brelse(tp, dbp);
|
|
xfs_da_brelse(tp, lbp);
|
|
return XFS_ERROR(ENOENT);
|
|
}
|
|
|
|
/*
|
|
* Remove an entry from a leaf format directory.
|
|
*/
|
|
int /* error */
|
|
xfs_dir2_leaf_removename(
|
|
xfs_da_args_t *args) /* operation arguments */
|
|
{
|
|
__be16 *bestsp; /* leaf block best freespace */
|
|
xfs_dir2_data_t *data; /* data block structure */
|
|
xfs_dir2_db_t db; /* data block number */
|
|
xfs_dabuf_t *dbp; /* data block buffer */
|
|
xfs_dir2_data_entry_t *dep; /* data entry structure */
|
|
xfs_inode_t *dp; /* incore directory inode */
|
|
int error; /* error return code */
|
|
xfs_dir2_db_t i; /* temporary data block # */
|
|
int index; /* index into leaf entries */
|
|
xfs_dabuf_t *lbp; /* leaf buffer */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
|
|
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
|
|
xfs_mount_t *mp; /* filesystem mount point */
|
|
int needlog; /* need to log data header */
|
|
int needscan; /* need to rescan data frees */
|
|
xfs_dir2_data_off_t oldbest; /* old value of best free */
|
|
xfs_trans_t *tp; /* transaction pointer */
|
|
|
|
trace_xfs_dir2_leaf_removename(args);
|
|
|
|
/*
|
|
* Lookup the leaf entry, get the leaf and data blocks read in.
|
|
*/
|
|
if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
|
|
return error;
|
|
}
|
|
dp = args->dp;
|
|
tp = args->trans;
|
|
mp = dp->i_mount;
|
|
leaf = lbp->data;
|
|
data = dbp->data;
|
|
xfs_dir2_data_check(dp, dbp);
|
|
/*
|
|
* Point to the leaf entry, use that to point to the data entry.
|
|
*/
|
|
lep = &leaf->ents[index];
|
|
db = xfs_dir2_dataptr_to_db(mp, be32_to_cpu(lep->address));
|
|
dep = (xfs_dir2_data_entry_t *)
|
|
((char *)data + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)));
|
|
needscan = needlog = 0;
|
|
oldbest = be16_to_cpu(data->hdr.bestfree[0].length);
|
|
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
|
|
bestsp = xfs_dir2_leaf_bests_p(ltp);
|
|
ASSERT(be16_to_cpu(bestsp[db]) == oldbest);
|
|
/*
|
|
* Mark the former data entry unused.
|
|
*/
|
|
xfs_dir2_data_make_free(tp, dbp,
|
|
(xfs_dir2_data_aoff_t)((char *)dep - (char *)data),
|
|
xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan);
|
|
/*
|
|
* We just mark the leaf entry stale by putting a null in it.
|
|
*/
|
|
be16_add_cpu(&leaf->hdr.stale, 1);
|
|
xfs_dir2_leaf_log_header(tp, lbp);
|
|
lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
|
|
xfs_dir2_leaf_log_ents(tp, lbp, index, index);
|
|
/*
|
|
* Scan the freespace in the data block again if necessary,
|
|
* log the data block header if necessary.
|
|
*/
|
|
if (needscan)
|
|
xfs_dir2_data_freescan(mp, data, &needlog);
|
|
if (needlog)
|
|
xfs_dir2_data_log_header(tp, dbp);
|
|
/*
|
|
* If the longest freespace in the data block has changed,
|
|
* put the new value in the bests table and log that.
|
|
*/
|
|
if (be16_to_cpu(data->hdr.bestfree[0].length) != oldbest) {
|
|
bestsp[db] = data->hdr.bestfree[0].length;
|
|
xfs_dir2_leaf_log_bests(tp, lbp, db, db);
|
|
}
|
|
xfs_dir2_data_check(dp, dbp);
|
|
/*
|
|
* If the data block is now empty then get rid of the data block.
|
|
*/
|
|
if (be16_to_cpu(data->hdr.bestfree[0].length) ==
|
|
mp->m_dirblksize - (uint)sizeof(data->hdr)) {
|
|
ASSERT(db != mp->m_dirdatablk);
|
|
if ((error = xfs_dir2_shrink_inode(args, db, dbp))) {
|
|
/*
|
|
* Nope, can't get rid of it because it caused
|
|
* allocation of a bmap btree block to do so.
|
|
* Just go on, returning success, leaving the
|
|
* empty block in place.
|
|
*/
|
|
if (error == ENOSPC && args->total == 0) {
|
|
xfs_da_buf_done(dbp);
|
|
error = 0;
|
|
}
|
|
xfs_dir2_leaf_check(dp, lbp);
|
|
xfs_da_buf_done(lbp);
|
|
return error;
|
|
}
|
|
dbp = NULL;
|
|
/*
|
|
* If this is the last data block then compact the
|
|
* bests table by getting rid of entries.
|
|
*/
|
|
if (db == be32_to_cpu(ltp->bestcount) - 1) {
|
|
/*
|
|
* Look for the last active entry (i).
|
|
*/
|
|
for (i = db - 1; i > 0; i--) {
|
|
if (be16_to_cpu(bestsp[i]) != NULLDATAOFF)
|
|
break;
|
|
}
|
|
/*
|
|
* Copy the table down so inactive entries at the
|
|
* end are removed.
|
|
*/
|
|
memmove(&bestsp[db - i], bestsp,
|
|
(be32_to_cpu(ltp->bestcount) - (db - i)) * sizeof(*bestsp));
|
|
be32_add_cpu(<p->bestcount, -(db - i));
|
|
xfs_dir2_leaf_log_tail(tp, lbp);
|
|
xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
|
|
} else
|
|
bestsp[db] = cpu_to_be16(NULLDATAOFF);
|
|
}
|
|
/*
|
|
* If the data block was not the first one, drop it.
|
|
*/
|
|
else if (db != mp->m_dirdatablk && dbp != NULL) {
|
|
xfs_da_buf_done(dbp);
|
|
dbp = NULL;
|
|
}
|
|
xfs_dir2_leaf_check(dp, lbp);
|
|
/*
|
|
* See if we can convert to block form.
|
|
*/
|
|
return xfs_dir2_leaf_to_block(args, lbp, dbp);
|
|
}
|
|
|
|
/*
|
|
* Replace the inode number in a leaf format directory entry.
|
|
*/
|
|
int /* error */
|
|
xfs_dir2_leaf_replace(
|
|
xfs_da_args_t *args) /* operation arguments */
|
|
{
|
|
xfs_dabuf_t *dbp; /* data block buffer */
|
|
xfs_dir2_data_entry_t *dep; /* data block entry */
|
|
xfs_inode_t *dp; /* incore directory inode */
|
|
int error; /* error return code */
|
|
int index; /* index of leaf entry */
|
|
xfs_dabuf_t *lbp; /* leaf buffer */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
|
|
xfs_trans_t *tp; /* transaction pointer */
|
|
|
|
trace_xfs_dir2_leaf_replace(args);
|
|
|
|
/*
|
|
* Look up the entry.
|
|
*/
|
|
if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
|
|
return error;
|
|
}
|
|
dp = args->dp;
|
|
leaf = lbp->data;
|
|
/*
|
|
* Point to the leaf entry, get data address from it.
|
|
*/
|
|
lep = &leaf->ents[index];
|
|
/*
|
|
* Point to the data entry.
|
|
*/
|
|
dep = (xfs_dir2_data_entry_t *)
|
|
((char *)dbp->data +
|
|
xfs_dir2_dataptr_to_off(dp->i_mount, be32_to_cpu(lep->address)));
|
|
ASSERT(args->inumber != be64_to_cpu(dep->inumber));
|
|
/*
|
|
* Put the new inode number in, log it.
|
|
*/
|
|
dep->inumber = cpu_to_be64(args->inumber);
|
|
tp = args->trans;
|
|
xfs_dir2_data_log_entry(tp, dbp, dep);
|
|
xfs_da_buf_done(dbp);
|
|
xfs_dir2_leaf_check(dp, lbp);
|
|
xfs_da_brelse(tp, lbp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return index in the leaf block (lbp) which is either the first
|
|
* one with this hash value, or if there are none, the insert point
|
|
* for that hash value.
|
|
*/
|
|
int /* index value */
|
|
xfs_dir2_leaf_search_hash(
|
|
xfs_da_args_t *args, /* operation arguments */
|
|
xfs_dabuf_t *lbp) /* leaf buffer */
|
|
{
|
|
xfs_dahash_t hash=0; /* hash from this entry */
|
|
xfs_dahash_t hashwant; /* hash value looking for */
|
|
int high; /* high leaf index */
|
|
int low; /* low leaf index */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
|
|
int mid=0; /* current leaf index */
|
|
|
|
leaf = lbp->data;
|
|
#ifndef __KERNEL__
|
|
if (!leaf->hdr.count)
|
|
return 0;
|
|
#endif
|
|
/*
|
|
* Note, the table cannot be empty, so we have to go through the loop.
|
|
* Binary search the leaf entries looking for our hash value.
|
|
*/
|
|
for (lep = leaf->ents, low = 0, high = be16_to_cpu(leaf->hdr.count) - 1,
|
|
hashwant = args->hashval;
|
|
low <= high; ) {
|
|
mid = (low + high) >> 1;
|
|
if ((hash = be32_to_cpu(lep[mid].hashval)) == hashwant)
|
|
break;
|
|
if (hash < hashwant)
|
|
low = mid + 1;
|
|
else
|
|
high = mid - 1;
|
|
}
|
|
/*
|
|
* Found one, back up through all the equal hash values.
|
|
*/
|
|
if (hash == hashwant) {
|
|
while (mid > 0 && be32_to_cpu(lep[mid - 1].hashval) == hashwant) {
|
|
mid--;
|
|
}
|
|
}
|
|
/*
|
|
* Need to point to an entry higher than ours.
|
|
*/
|
|
else if (hash < hashwant)
|
|
mid++;
|
|
return mid;
|
|
}
|
|
|
|
/*
|
|
* Trim off a trailing data block. We know it's empty since the leaf
|
|
* freespace table says so.
|
|
*/
|
|
int /* error */
|
|
xfs_dir2_leaf_trim_data(
|
|
xfs_da_args_t *args, /* operation arguments */
|
|
xfs_dabuf_t *lbp, /* leaf buffer */
|
|
xfs_dir2_db_t db) /* data block number */
|
|
{
|
|
__be16 *bestsp; /* leaf bests table */
|
|
#ifdef DEBUG
|
|
xfs_dir2_data_t *data; /* data block structure */
|
|
#endif
|
|
xfs_dabuf_t *dbp; /* data block buffer */
|
|
xfs_inode_t *dp; /* incore directory inode */
|
|
int error; /* error return value */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
|
|
xfs_mount_t *mp; /* filesystem mount point */
|
|
xfs_trans_t *tp; /* transaction pointer */
|
|
|
|
dp = args->dp;
|
|
mp = dp->i_mount;
|
|
tp = args->trans;
|
|
/*
|
|
* Read the offending data block. We need its buffer.
|
|
*/
|
|
if ((error = xfs_da_read_buf(tp, dp, xfs_dir2_db_to_da(mp, db), -1, &dbp,
|
|
XFS_DATA_FORK))) {
|
|
return error;
|
|
}
|
|
#ifdef DEBUG
|
|
data = dbp->data;
|
|
ASSERT(be32_to_cpu(data->hdr.magic) == XFS_DIR2_DATA_MAGIC);
|
|
#endif
|
|
/* this seems to be an error
|
|
* data is only valid if DEBUG is defined?
|
|
* RMC 09/08/1999
|
|
*/
|
|
|
|
leaf = lbp->data;
|
|
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
|
|
ASSERT(be16_to_cpu(data->hdr.bestfree[0].length) ==
|
|
mp->m_dirblksize - (uint)sizeof(data->hdr));
|
|
ASSERT(db == be32_to_cpu(ltp->bestcount) - 1);
|
|
/*
|
|
* Get rid of the data block.
|
|
*/
|
|
if ((error = xfs_dir2_shrink_inode(args, db, dbp))) {
|
|
ASSERT(error != ENOSPC);
|
|
xfs_da_brelse(tp, dbp);
|
|
return error;
|
|
}
|
|
/*
|
|
* Eliminate the last bests entry from the table.
|
|
*/
|
|
bestsp = xfs_dir2_leaf_bests_p(ltp);
|
|
be32_add_cpu(<p->bestcount, -1);
|
|
memmove(&bestsp[1], &bestsp[0], be32_to_cpu(ltp->bestcount) * sizeof(*bestsp));
|
|
xfs_dir2_leaf_log_tail(tp, lbp);
|
|
xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Convert node form directory to leaf form directory.
|
|
* The root of the node form dir needs to already be a LEAFN block.
|
|
* Just return if we can't do anything.
|
|
*/
|
|
int /* error */
|
|
xfs_dir2_node_to_leaf(
|
|
xfs_da_state_t *state) /* directory operation state */
|
|
{
|
|
xfs_da_args_t *args; /* operation arguments */
|
|
xfs_inode_t *dp; /* incore directory inode */
|
|
int error; /* error return code */
|
|
xfs_dabuf_t *fbp; /* buffer for freespace block */
|
|
xfs_fileoff_t fo; /* freespace file offset */
|
|
xfs_dir2_free_t *free; /* freespace structure */
|
|
xfs_dabuf_t *lbp; /* buffer for leaf block */
|
|
xfs_dir2_leaf_tail_t *ltp; /* tail of leaf structure */
|
|
xfs_dir2_leaf_t *leaf; /* leaf structure */
|
|
xfs_mount_t *mp; /* filesystem mount point */
|
|
int rval; /* successful free trim? */
|
|
xfs_trans_t *tp; /* transaction pointer */
|
|
|
|
/*
|
|
* There's more than a leaf level in the btree, so there must
|
|
* be multiple leafn blocks. Give up.
|
|
*/
|
|
if (state->path.active > 1)
|
|
return 0;
|
|
args = state->args;
|
|
|
|
trace_xfs_dir2_node_to_leaf(args);
|
|
|
|
mp = state->mp;
|
|
dp = args->dp;
|
|
tp = args->trans;
|
|
/*
|
|
* Get the last offset in the file.
|
|
*/
|
|
if ((error = xfs_bmap_last_offset(tp, dp, &fo, XFS_DATA_FORK))) {
|
|
return error;
|
|
}
|
|
fo -= mp->m_dirblkfsbs;
|
|
/*
|
|
* If there are freespace blocks other than the first one,
|
|
* take this opportunity to remove trailing empty freespace blocks
|
|
* that may have been left behind during no-space-reservation
|
|
* operations.
|
|
*/
|
|
while (fo > mp->m_dirfreeblk) {
|
|
if ((error = xfs_dir2_node_trim_free(args, fo, &rval))) {
|
|
return error;
|
|
}
|
|
if (rval)
|
|
fo -= mp->m_dirblkfsbs;
|
|
else
|
|
return 0;
|
|
}
|
|
/*
|
|
* Now find the block just before the freespace block.
|
|
*/
|
|
if ((error = xfs_bmap_last_before(tp, dp, &fo, XFS_DATA_FORK))) {
|
|
return error;
|
|
}
|
|
/*
|
|
* If it's not the single leaf block, give up.
|
|
*/
|
|
if (XFS_FSB_TO_B(mp, fo) > XFS_DIR2_LEAF_OFFSET + mp->m_dirblksize)
|
|
return 0;
|
|
lbp = state->path.blk[0].bp;
|
|
leaf = lbp->data;
|
|
ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC);
|
|
/*
|
|
* Read the freespace block.
|
|
*/
|
|
if ((error = xfs_da_read_buf(tp, dp, mp->m_dirfreeblk, -1, &fbp,
|
|
XFS_DATA_FORK))) {
|
|
return error;
|
|
}
|
|
free = fbp->data;
|
|
ASSERT(be32_to_cpu(free->hdr.magic) == XFS_DIR2_FREE_MAGIC);
|
|
ASSERT(!free->hdr.firstdb);
|
|
/*
|
|
* Now see if the leafn and free data will fit in a leaf1.
|
|
* If not, release the buffer and give up.
|
|
*/
|
|
if ((uint)sizeof(leaf->hdr) +
|
|
(be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale)) * (uint)sizeof(leaf->ents[0]) +
|
|
be32_to_cpu(free->hdr.nvalid) * (uint)sizeof(leaf->bests[0]) +
|
|
(uint)sizeof(leaf->tail) >
|
|
mp->m_dirblksize) {
|
|
xfs_da_brelse(tp, fbp);
|
|
return 0;
|
|
}
|
|
/*
|
|
* If the leaf has any stale entries in it, compress them out.
|
|
* The compact routine will log the header.
|
|
*/
|
|
if (be16_to_cpu(leaf->hdr.stale))
|
|
xfs_dir2_leaf_compact(args, lbp);
|
|
else
|
|
xfs_dir2_leaf_log_header(tp, lbp);
|
|
leaf->hdr.info.magic = cpu_to_be16(XFS_DIR2_LEAF1_MAGIC);
|
|
/*
|
|
* Set up the leaf tail from the freespace block.
|
|
*/
|
|
ltp = xfs_dir2_leaf_tail_p(mp, leaf);
|
|
ltp->bestcount = free->hdr.nvalid;
|
|
/*
|
|
* Set up the leaf bests table.
|
|
*/
|
|
memcpy(xfs_dir2_leaf_bests_p(ltp), free->bests,
|
|
be32_to_cpu(ltp->bestcount) * sizeof(leaf->bests[0]));
|
|
xfs_dir2_leaf_log_bests(tp, lbp, 0, be32_to_cpu(ltp->bestcount) - 1);
|
|
xfs_dir2_leaf_log_tail(tp, lbp);
|
|
xfs_dir2_leaf_check(dp, lbp);
|
|
/*
|
|
* Get rid of the freespace block.
|
|
*/
|
|
error = xfs_dir2_shrink_inode(args, XFS_DIR2_FREE_FIRSTDB(mp), fbp);
|
|
if (error) {
|
|
/*
|
|
* This can't fail here because it can only happen when
|
|
* punching out the middle of an extent, and this is an
|
|
* isolated block.
|
|
*/
|
|
ASSERT(error != ENOSPC);
|
|
return error;
|
|
}
|
|
fbp = NULL;
|
|
/*
|
|
* Now see if we can convert the single-leaf directory
|
|
* down to a block form directory.
|
|
* This routine always kills the dabuf for the leaf, so
|
|
* eliminate it from the path.
|
|
*/
|
|
error = xfs_dir2_leaf_to_block(args, lbp, NULL);
|
|
state->path.blk[0].bp = NULL;
|
|
return error;
|
|
}
|