1054 строки
31 KiB
C
1054 строки
31 KiB
C
/*
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* Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
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* Copyright (c) 2013 Red Hat, 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_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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#include "xfs_inode.h"
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#include "xfs_dir2.h"
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#include "xfs_dir2_priv.h"
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#include "xfs_error.h"
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#include "xfs_trans.h"
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#include "xfs_buf_item.h"
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#include "xfs_cksum.h"
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#include "xfs_log.h"
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/*
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* Check the consistency of the data block.
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* The input can also be a block-format directory.
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* Return 0 is the buffer is good, otherwise an error.
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*/
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int
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__xfs_dir3_data_check(
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struct xfs_inode *dp, /* incore inode pointer */
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struct xfs_buf *bp) /* data block's buffer */
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{
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xfs_dir2_dataptr_t addr; /* addr for leaf lookup */
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xfs_dir2_data_free_t *bf; /* bestfree table */
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xfs_dir2_block_tail_t *btp=NULL; /* block tail */
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int count; /* count of entries found */
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xfs_dir2_data_hdr_t *hdr; /* data block header */
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xfs_dir2_data_entry_t *dep; /* data entry */
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xfs_dir2_data_free_t *dfp; /* bestfree entry */
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xfs_dir2_data_unused_t *dup; /* unused entry */
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char *endp; /* end of useful data */
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int freeseen; /* mask of bestfrees seen */
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xfs_dahash_t hash; /* hash of current name */
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int i; /* leaf index */
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int lastfree; /* last entry was unused */
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xfs_dir2_leaf_entry_t *lep=NULL; /* block leaf entries */
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xfs_mount_t *mp; /* filesystem mount point */
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char *p; /* current data position */
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int stale; /* count of stale leaves */
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struct xfs_name name;
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const struct xfs_dir_ops *ops;
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struct xfs_da_geometry *geo;
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mp = bp->b_target->bt_mount;
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geo = mp->m_dir_geo;
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/*
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* We can be passed a null dp here from a verifier, so we need to go the
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* hard way to get them.
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*/
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ops = xfs_dir_get_ops(mp, dp);
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hdr = bp->b_addr;
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p = (char *)ops->data_entry_p(hdr);
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switch (hdr->magic) {
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case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC):
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case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC):
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btp = xfs_dir2_block_tail_p(geo, hdr);
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lep = xfs_dir2_block_leaf_p(btp);
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endp = (char *)lep;
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/*
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* The number of leaf entries is limited by the size of the
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* block and the amount of space used by the data entries.
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* We don't know how much space is used by the data entries yet,
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* so just ensure that the count falls somewhere inside the
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* block right now.
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*/
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XFS_WANT_CORRUPTED_RETURN(mp, be32_to_cpu(btp->count) <
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((char *)btp - p) / sizeof(struct xfs_dir2_leaf_entry));
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break;
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case cpu_to_be32(XFS_DIR3_DATA_MAGIC):
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case cpu_to_be32(XFS_DIR2_DATA_MAGIC):
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endp = (char *)hdr + geo->blksize;
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break;
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default:
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XFS_ERROR_REPORT("Bad Magic", XFS_ERRLEVEL_LOW, mp);
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return -EFSCORRUPTED;
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}
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/*
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* Account for zero bestfree entries.
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*/
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bf = ops->data_bestfree_p(hdr);
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count = lastfree = freeseen = 0;
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if (!bf[0].length) {
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XFS_WANT_CORRUPTED_RETURN(mp, !bf[0].offset);
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freeseen |= 1 << 0;
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}
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if (!bf[1].length) {
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XFS_WANT_CORRUPTED_RETURN(mp, !bf[1].offset);
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freeseen |= 1 << 1;
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}
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if (!bf[2].length) {
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XFS_WANT_CORRUPTED_RETURN(mp, !bf[2].offset);
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freeseen |= 1 << 2;
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}
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XFS_WANT_CORRUPTED_RETURN(mp, be16_to_cpu(bf[0].length) >=
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be16_to_cpu(bf[1].length));
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XFS_WANT_CORRUPTED_RETURN(mp, be16_to_cpu(bf[1].length) >=
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be16_to_cpu(bf[2].length));
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/*
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* Loop over the data/unused entries.
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*/
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while (p < endp) {
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dup = (xfs_dir2_data_unused_t *)p;
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/*
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* If it's unused, look for the space in the bestfree table.
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* If we find it, account for that, else make sure it
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* doesn't need to be there.
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*/
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if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
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XFS_WANT_CORRUPTED_RETURN(mp, lastfree == 0);
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XFS_WANT_CORRUPTED_RETURN(mp,
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be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)) ==
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(char *)dup - (char *)hdr);
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dfp = xfs_dir2_data_freefind(hdr, bf, dup);
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if (dfp) {
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i = (int)(dfp - bf);
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XFS_WANT_CORRUPTED_RETURN(mp,
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(freeseen & (1 << i)) == 0);
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freeseen |= 1 << i;
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} else {
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XFS_WANT_CORRUPTED_RETURN(mp,
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be16_to_cpu(dup->length) <=
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be16_to_cpu(bf[2].length));
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}
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p += be16_to_cpu(dup->length);
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lastfree = 1;
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continue;
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}
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/*
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* It's a real entry. Validate the fields.
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* If this is a block directory then make sure it's
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* in the leaf section of the block.
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* The linear search is crude but this is DEBUG code.
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*/
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dep = (xfs_dir2_data_entry_t *)p;
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XFS_WANT_CORRUPTED_RETURN(mp, dep->namelen != 0);
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XFS_WANT_CORRUPTED_RETURN(mp,
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!xfs_dir_ino_validate(mp, be64_to_cpu(dep->inumber)));
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XFS_WANT_CORRUPTED_RETURN(mp,
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be16_to_cpu(*ops->data_entry_tag_p(dep)) ==
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(char *)dep - (char *)hdr);
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XFS_WANT_CORRUPTED_RETURN(mp,
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ops->data_get_ftype(dep) < XFS_DIR3_FT_MAX);
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count++;
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lastfree = 0;
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if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
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hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
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addr = xfs_dir2_db_off_to_dataptr(geo, geo->datablk,
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(xfs_dir2_data_aoff_t)
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((char *)dep - (char *)hdr));
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name.name = dep->name;
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name.len = dep->namelen;
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hash = mp->m_dirnameops->hashname(&name);
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for (i = 0; i < be32_to_cpu(btp->count); i++) {
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if (be32_to_cpu(lep[i].address) == addr &&
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be32_to_cpu(lep[i].hashval) == hash)
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break;
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}
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XFS_WANT_CORRUPTED_RETURN(mp,
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i < be32_to_cpu(btp->count));
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}
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p += ops->data_entsize(dep->namelen);
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}
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/*
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* Need to have seen all the entries and all the bestfree slots.
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*/
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XFS_WANT_CORRUPTED_RETURN(mp, freeseen == 7);
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if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
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hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
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for (i = stale = 0; i < be32_to_cpu(btp->count); i++) {
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if (lep[i].address ==
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cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
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stale++;
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if (i > 0)
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XFS_WANT_CORRUPTED_RETURN(mp,
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be32_to_cpu(lep[i].hashval) >=
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be32_to_cpu(lep[i - 1].hashval));
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}
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XFS_WANT_CORRUPTED_RETURN(mp, count ==
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be32_to_cpu(btp->count) - be32_to_cpu(btp->stale));
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XFS_WANT_CORRUPTED_RETURN(mp, stale == be32_to_cpu(btp->stale));
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}
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return 0;
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}
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static bool
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xfs_dir3_data_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
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if (xfs_sb_version_hascrc(&mp->m_sb)) {
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if (hdr3->magic != cpu_to_be32(XFS_DIR3_DATA_MAGIC))
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return false;
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if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
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return false;
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if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
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return false;
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if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->lsn)))
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return false;
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} else {
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if (hdr3->magic != cpu_to_be32(XFS_DIR2_DATA_MAGIC))
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return false;
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}
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if (__xfs_dir3_data_check(NULL, bp))
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return false;
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return true;
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}
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/*
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* Readahead of the first block of the directory when it is opened is completely
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* oblivious to the format of the directory. Hence we can either get a block
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* format buffer or a data format buffer on readahead.
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*/
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static void
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xfs_dir3_data_reada_verify(
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struct xfs_buf *bp)
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{
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struct xfs_dir2_data_hdr *hdr = bp->b_addr;
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switch (hdr->magic) {
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case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC):
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case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC):
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bp->b_ops = &xfs_dir3_block_buf_ops;
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bp->b_ops->verify_read(bp);
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return;
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case cpu_to_be32(XFS_DIR2_DATA_MAGIC):
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case cpu_to_be32(XFS_DIR3_DATA_MAGIC):
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bp->b_ops = &xfs_dir3_data_buf_ops;
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bp->b_ops->verify_read(bp);
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return;
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default:
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xfs_buf_ioerror(bp, -EFSCORRUPTED);
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xfs_verifier_error(bp);
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break;
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}
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}
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static void
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xfs_dir3_data_read_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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if (xfs_sb_version_hascrc(&mp->m_sb) &&
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!xfs_buf_verify_cksum(bp, XFS_DIR3_DATA_CRC_OFF))
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xfs_buf_ioerror(bp, -EFSBADCRC);
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else if (!xfs_dir3_data_verify(bp))
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xfs_buf_ioerror(bp, -EFSCORRUPTED);
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if (bp->b_error)
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xfs_verifier_error(bp);
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}
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static void
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xfs_dir3_data_write_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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struct xfs_buf_log_item *bip = bp->b_fspriv;
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struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
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if (!xfs_dir3_data_verify(bp)) {
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xfs_buf_ioerror(bp, -EFSCORRUPTED);
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xfs_verifier_error(bp);
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return;
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}
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return;
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if (bip)
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hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn);
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xfs_buf_update_cksum(bp, XFS_DIR3_DATA_CRC_OFF);
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}
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const struct xfs_buf_ops xfs_dir3_data_buf_ops = {
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.verify_read = xfs_dir3_data_read_verify,
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.verify_write = xfs_dir3_data_write_verify,
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};
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static const struct xfs_buf_ops xfs_dir3_data_reada_buf_ops = {
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.verify_read = xfs_dir3_data_reada_verify,
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.verify_write = xfs_dir3_data_write_verify,
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};
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int
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xfs_dir3_data_read(
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struct xfs_trans *tp,
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struct xfs_inode *dp,
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xfs_dablk_t bno,
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xfs_daddr_t mapped_bno,
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struct xfs_buf **bpp)
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{
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int err;
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err = xfs_da_read_buf(tp, dp, bno, mapped_bno, bpp,
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XFS_DATA_FORK, &xfs_dir3_data_buf_ops);
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if (!err && tp)
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xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_DATA_BUF);
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return err;
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}
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int
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xfs_dir3_data_readahead(
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struct xfs_inode *dp,
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xfs_dablk_t bno,
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xfs_daddr_t mapped_bno)
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{
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return xfs_da_reada_buf(dp, bno, mapped_bno,
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XFS_DATA_FORK, &xfs_dir3_data_reada_buf_ops);
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}
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/*
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* Given a data block and an unused entry from that block,
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* return the bestfree entry if any that corresponds to it.
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*/
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xfs_dir2_data_free_t *
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xfs_dir2_data_freefind(
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struct xfs_dir2_data_hdr *hdr, /* data block header */
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struct xfs_dir2_data_free *bf, /* bestfree table pointer */
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struct xfs_dir2_data_unused *dup) /* unused space */
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{
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xfs_dir2_data_free_t *dfp; /* bestfree entry */
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xfs_dir2_data_aoff_t off; /* offset value needed */
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#ifdef DEBUG
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int matched; /* matched the value */
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int seenzero; /* saw a 0 bestfree entry */
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#endif
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off = (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr);
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#ifdef DEBUG
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/*
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* Validate some consistency in the bestfree table.
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* Check order, non-overlapping entries, and if we find the
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* one we're looking for it has to be exact.
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*/
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ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
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hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
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hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
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hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
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for (dfp = &bf[0], seenzero = matched = 0;
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dfp < &bf[XFS_DIR2_DATA_FD_COUNT];
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dfp++) {
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if (!dfp->offset) {
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ASSERT(!dfp->length);
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seenzero = 1;
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continue;
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}
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ASSERT(seenzero == 0);
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if (be16_to_cpu(dfp->offset) == off) {
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matched = 1;
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ASSERT(dfp->length == dup->length);
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} else if (off < be16_to_cpu(dfp->offset))
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ASSERT(off + be16_to_cpu(dup->length) <= be16_to_cpu(dfp->offset));
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else
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ASSERT(be16_to_cpu(dfp->offset) + be16_to_cpu(dfp->length) <= off);
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ASSERT(matched || be16_to_cpu(dfp->length) >= be16_to_cpu(dup->length));
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if (dfp > &bf[0])
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ASSERT(be16_to_cpu(dfp[-1].length) >= be16_to_cpu(dfp[0].length));
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}
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#endif
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/*
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* If this is smaller than the smallest bestfree entry,
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* it can't be there since they're sorted.
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*/
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if (be16_to_cpu(dup->length) <
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be16_to_cpu(bf[XFS_DIR2_DATA_FD_COUNT - 1].length))
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return NULL;
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/*
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* Look at the three bestfree entries for our guy.
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*/
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for (dfp = &bf[0]; dfp < &bf[XFS_DIR2_DATA_FD_COUNT]; dfp++) {
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if (!dfp->offset)
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return NULL;
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if (be16_to_cpu(dfp->offset) == off)
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return dfp;
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}
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/*
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* Didn't find it. This only happens if there are duplicate lengths.
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*/
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return NULL;
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}
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/*
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* Insert an unused-space entry into the bestfree table.
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*/
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xfs_dir2_data_free_t * /* entry inserted */
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xfs_dir2_data_freeinsert(
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struct xfs_dir2_data_hdr *hdr, /* data block pointer */
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struct xfs_dir2_data_free *dfp, /* bestfree table pointer */
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struct xfs_dir2_data_unused *dup, /* unused space */
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int *loghead) /* log the data header (out) */
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{
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xfs_dir2_data_free_t new; /* new bestfree entry */
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ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
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hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
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hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
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hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
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new.length = dup->length;
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new.offset = cpu_to_be16((char *)dup - (char *)hdr);
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/*
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* Insert at position 0, 1, or 2; or not at all.
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*/
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if (be16_to_cpu(new.length) > be16_to_cpu(dfp[0].length)) {
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dfp[2] = dfp[1];
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dfp[1] = dfp[0];
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dfp[0] = new;
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*loghead = 1;
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return &dfp[0];
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|
}
|
|
if (be16_to_cpu(new.length) > be16_to_cpu(dfp[1].length)) {
|
|
dfp[2] = dfp[1];
|
|
dfp[1] = new;
|
|
*loghead = 1;
|
|
return &dfp[1];
|
|
}
|
|
if (be16_to_cpu(new.length) > be16_to_cpu(dfp[2].length)) {
|
|
dfp[2] = new;
|
|
*loghead = 1;
|
|
return &dfp[2];
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Remove a bestfree entry from the table.
|
|
*/
|
|
STATIC void
|
|
xfs_dir2_data_freeremove(
|
|
struct xfs_dir2_data_hdr *hdr, /* data block header */
|
|
struct xfs_dir2_data_free *bf, /* bestfree table pointer */
|
|
struct xfs_dir2_data_free *dfp, /* bestfree entry pointer */
|
|
int *loghead) /* out: log data header */
|
|
{
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
|
|
/*
|
|
* It's the first entry, slide the next 2 up.
|
|
*/
|
|
if (dfp == &bf[0]) {
|
|
bf[0] = bf[1];
|
|
bf[1] = bf[2];
|
|
}
|
|
/*
|
|
* It's the second entry, slide the 3rd entry up.
|
|
*/
|
|
else if (dfp == &bf[1])
|
|
bf[1] = bf[2];
|
|
/*
|
|
* Must be the last entry.
|
|
*/
|
|
else
|
|
ASSERT(dfp == &bf[2]);
|
|
/*
|
|
* Clear the 3rd entry, must be zero now.
|
|
*/
|
|
bf[2].length = 0;
|
|
bf[2].offset = 0;
|
|
*loghead = 1;
|
|
}
|
|
|
|
/*
|
|
* Given a data block, reconstruct its bestfree map.
|
|
*/
|
|
void
|
|
xfs_dir2_data_freescan(
|
|
struct xfs_inode *dp,
|
|
struct xfs_dir2_data_hdr *hdr,
|
|
int *loghead)
|
|
{
|
|
xfs_dir2_block_tail_t *btp; /* block tail */
|
|
xfs_dir2_data_entry_t *dep; /* active data entry */
|
|
xfs_dir2_data_unused_t *dup; /* unused data entry */
|
|
struct xfs_dir2_data_free *bf;
|
|
char *endp; /* end of block's data */
|
|
char *p; /* current entry pointer */
|
|
struct xfs_da_geometry *geo = dp->i_mount->m_dir_geo;
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
|
|
/*
|
|
* Start by clearing the table.
|
|
*/
|
|
bf = dp->d_ops->data_bestfree_p(hdr);
|
|
memset(bf, 0, sizeof(*bf) * XFS_DIR2_DATA_FD_COUNT);
|
|
*loghead = 1;
|
|
/*
|
|
* Set up pointers.
|
|
*/
|
|
p = (char *)dp->d_ops->data_entry_p(hdr);
|
|
if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
|
|
btp = xfs_dir2_block_tail_p(geo, hdr);
|
|
endp = (char *)xfs_dir2_block_leaf_p(btp);
|
|
} else
|
|
endp = (char *)hdr + geo->blksize;
|
|
/*
|
|
* Loop over the block's entries.
|
|
*/
|
|
while (p < endp) {
|
|
dup = (xfs_dir2_data_unused_t *)p;
|
|
/*
|
|
* If it's a free entry, insert it.
|
|
*/
|
|
if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
|
|
ASSERT((char *)dup - (char *)hdr ==
|
|
be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)));
|
|
xfs_dir2_data_freeinsert(hdr, bf, dup, loghead);
|
|
p += be16_to_cpu(dup->length);
|
|
}
|
|
/*
|
|
* For active entries, check their tags and skip them.
|
|
*/
|
|
else {
|
|
dep = (xfs_dir2_data_entry_t *)p;
|
|
ASSERT((char *)dep - (char *)hdr ==
|
|
be16_to_cpu(*dp->d_ops->data_entry_tag_p(dep)));
|
|
p += dp->d_ops->data_entsize(dep->namelen);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialize a data block at the given block number in the directory.
|
|
* Give back the buffer for the created block.
|
|
*/
|
|
int /* error */
|
|
xfs_dir3_data_init(
|
|
xfs_da_args_t *args, /* directory operation args */
|
|
xfs_dir2_db_t blkno, /* logical dir block number */
|
|
struct xfs_buf **bpp) /* output block buffer */
|
|
{
|
|
struct xfs_buf *bp; /* block buffer */
|
|
xfs_dir2_data_hdr_t *hdr; /* data block header */
|
|
xfs_inode_t *dp; /* incore directory inode */
|
|
xfs_dir2_data_unused_t *dup; /* unused entry pointer */
|
|
struct xfs_dir2_data_free *bf;
|
|
int error; /* error return value */
|
|
int i; /* bestfree index */
|
|
xfs_mount_t *mp; /* filesystem mount point */
|
|
xfs_trans_t *tp; /* transaction pointer */
|
|
int t; /* temp */
|
|
|
|
dp = args->dp;
|
|
mp = dp->i_mount;
|
|
tp = args->trans;
|
|
/*
|
|
* Get the buffer set up for the block.
|
|
*/
|
|
error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(args->geo, blkno),
|
|
-1, &bp, XFS_DATA_FORK);
|
|
if (error)
|
|
return error;
|
|
bp->b_ops = &xfs_dir3_data_buf_ops;
|
|
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_DATA_BUF);
|
|
|
|
/*
|
|
* Initialize the header.
|
|
*/
|
|
hdr = bp->b_addr;
|
|
if (xfs_sb_version_hascrc(&mp->m_sb)) {
|
|
struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
|
|
|
|
memset(hdr3, 0, sizeof(*hdr3));
|
|
hdr3->magic = cpu_to_be32(XFS_DIR3_DATA_MAGIC);
|
|
hdr3->blkno = cpu_to_be64(bp->b_bn);
|
|
hdr3->owner = cpu_to_be64(dp->i_ino);
|
|
uuid_copy(&hdr3->uuid, &mp->m_sb.sb_meta_uuid);
|
|
|
|
} else
|
|
hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
|
|
|
|
bf = dp->d_ops->data_bestfree_p(hdr);
|
|
bf[0].offset = cpu_to_be16(dp->d_ops->data_entry_offset);
|
|
for (i = 1; i < XFS_DIR2_DATA_FD_COUNT; i++) {
|
|
bf[i].length = 0;
|
|
bf[i].offset = 0;
|
|
}
|
|
|
|
/*
|
|
* Set up an unused entry for the block's body.
|
|
*/
|
|
dup = dp->d_ops->data_unused_p(hdr);
|
|
dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
|
|
|
|
t = args->geo->blksize - (uint)dp->d_ops->data_entry_offset;
|
|
bf[0].length = cpu_to_be16(t);
|
|
dup->length = cpu_to_be16(t);
|
|
*xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16((char *)dup - (char *)hdr);
|
|
/*
|
|
* Log it and return it.
|
|
*/
|
|
xfs_dir2_data_log_header(args, bp);
|
|
xfs_dir2_data_log_unused(args, bp, dup);
|
|
*bpp = bp;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Log an active data entry from the block.
|
|
*/
|
|
void
|
|
xfs_dir2_data_log_entry(
|
|
struct xfs_da_args *args,
|
|
struct xfs_buf *bp,
|
|
xfs_dir2_data_entry_t *dep) /* data entry pointer */
|
|
{
|
|
struct xfs_dir2_data_hdr *hdr = bp->b_addr;
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
|
|
xfs_trans_log_buf(args->trans, bp, (uint)((char *)dep - (char *)hdr),
|
|
(uint)((char *)(args->dp->d_ops->data_entry_tag_p(dep) + 1) -
|
|
(char *)hdr - 1));
|
|
}
|
|
|
|
/*
|
|
* Log a data block header.
|
|
*/
|
|
void
|
|
xfs_dir2_data_log_header(
|
|
struct xfs_da_args *args,
|
|
struct xfs_buf *bp)
|
|
{
|
|
#ifdef DEBUG
|
|
struct xfs_dir2_data_hdr *hdr = bp->b_addr;
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
#endif
|
|
|
|
xfs_trans_log_buf(args->trans, bp, 0,
|
|
args->dp->d_ops->data_entry_offset - 1);
|
|
}
|
|
|
|
/*
|
|
* Log a data unused entry.
|
|
*/
|
|
void
|
|
xfs_dir2_data_log_unused(
|
|
struct xfs_da_args *args,
|
|
struct xfs_buf *bp,
|
|
xfs_dir2_data_unused_t *dup) /* data unused pointer */
|
|
{
|
|
xfs_dir2_data_hdr_t *hdr = bp->b_addr;
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
|
|
/*
|
|
* Log the first part of the unused entry.
|
|
*/
|
|
xfs_trans_log_buf(args->trans, bp, (uint)((char *)dup - (char *)hdr),
|
|
(uint)((char *)&dup->length + sizeof(dup->length) -
|
|
1 - (char *)hdr));
|
|
/*
|
|
* Log the end (tag) of the unused entry.
|
|
*/
|
|
xfs_trans_log_buf(args->trans, bp,
|
|
(uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr),
|
|
(uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr +
|
|
sizeof(xfs_dir2_data_off_t) - 1));
|
|
}
|
|
|
|
/*
|
|
* Make a byte range in the data block unused.
|
|
* Its current contents are unimportant.
|
|
*/
|
|
void
|
|
xfs_dir2_data_make_free(
|
|
struct xfs_da_args *args,
|
|
struct xfs_buf *bp,
|
|
xfs_dir2_data_aoff_t offset, /* starting byte offset */
|
|
xfs_dir2_data_aoff_t len, /* length in bytes */
|
|
int *needlogp, /* out: log header */
|
|
int *needscanp) /* out: regen bestfree */
|
|
{
|
|
xfs_dir2_data_hdr_t *hdr; /* data block pointer */
|
|
xfs_dir2_data_free_t *dfp; /* bestfree pointer */
|
|
char *endptr; /* end of data area */
|
|
int needscan; /* need to regen bestfree */
|
|
xfs_dir2_data_unused_t *newdup; /* new unused entry */
|
|
xfs_dir2_data_unused_t *postdup; /* unused entry after us */
|
|
xfs_dir2_data_unused_t *prevdup; /* unused entry before us */
|
|
struct xfs_dir2_data_free *bf;
|
|
|
|
hdr = bp->b_addr;
|
|
|
|
/*
|
|
* Figure out where the end of the data area is.
|
|
*/
|
|
if (hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC))
|
|
endptr = (char *)hdr + args->geo->blksize;
|
|
else {
|
|
xfs_dir2_block_tail_t *btp; /* block tail */
|
|
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
btp = xfs_dir2_block_tail_p(args->geo, hdr);
|
|
endptr = (char *)xfs_dir2_block_leaf_p(btp);
|
|
}
|
|
/*
|
|
* If this isn't the start of the block, then back up to
|
|
* the previous entry and see if it's free.
|
|
*/
|
|
if (offset > args->dp->d_ops->data_entry_offset) {
|
|
__be16 *tagp; /* tag just before us */
|
|
|
|
tagp = (__be16 *)((char *)hdr + offset) - 1;
|
|
prevdup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp));
|
|
if (be16_to_cpu(prevdup->freetag) != XFS_DIR2_DATA_FREE_TAG)
|
|
prevdup = NULL;
|
|
} else
|
|
prevdup = NULL;
|
|
/*
|
|
* If this isn't the end of the block, see if the entry after
|
|
* us is free.
|
|
*/
|
|
if ((char *)hdr + offset + len < endptr) {
|
|
postdup =
|
|
(xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
|
|
if (be16_to_cpu(postdup->freetag) != XFS_DIR2_DATA_FREE_TAG)
|
|
postdup = NULL;
|
|
} else
|
|
postdup = NULL;
|
|
ASSERT(*needscanp == 0);
|
|
needscan = 0;
|
|
/*
|
|
* Previous and following entries are both free,
|
|
* merge everything into a single free entry.
|
|
*/
|
|
bf = args->dp->d_ops->data_bestfree_p(hdr);
|
|
if (prevdup && postdup) {
|
|
xfs_dir2_data_free_t *dfp2; /* another bestfree pointer */
|
|
|
|
/*
|
|
* See if prevdup and/or postdup are in bestfree table.
|
|
*/
|
|
dfp = xfs_dir2_data_freefind(hdr, bf, prevdup);
|
|
dfp2 = xfs_dir2_data_freefind(hdr, bf, postdup);
|
|
/*
|
|
* We need a rescan unless there are exactly 2 free entries
|
|
* namely our two. Then we know what's happening, otherwise
|
|
* since the third bestfree is there, there might be more
|
|
* entries.
|
|
*/
|
|
needscan = (bf[2].length != 0);
|
|
/*
|
|
* Fix up the new big freespace.
|
|
*/
|
|
be16_add_cpu(&prevdup->length, len + be16_to_cpu(postdup->length));
|
|
*xfs_dir2_data_unused_tag_p(prevdup) =
|
|
cpu_to_be16((char *)prevdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, prevdup);
|
|
if (!needscan) {
|
|
/*
|
|
* Has to be the case that entries 0 and 1 are
|
|
* dfp and dfp2 (don't know which is which), and
|
|
* entry 2 is empty.
|
|
* Remove entry 1 first then entry 0.
|
|
*/
|
|
ASSERT(dfp && dfp2);
|
|
if (dfp == &bf[1]) {
|
|
dfp = &bf[0];
|
|
ASSERT(dfp2 == dfp);
|
|
dfp2 = &bf[1];
|
|
}
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp2, needlogp);
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
|
|
/*
|
|
* Now insert the new entry.
|
|
*/
|
|
dfp = xfs_dir2_data_freeinsert(hdr, bf, prevdup,
|
|
needlogp);
|
|
ASSERT(dfp == &bf[0]);
|
|
ASSERT(dfp->length == prevdup->length);
|
|
ASSERT(!dfp[1].length);
|
|
ASSERT(!dfp[2].length);
|
|
}
|
|
}
|
|
/*
|
|
* The entry before us is free, merge with it.
|
|
*/
|
|
else if (prevdup) {
|
|
dfp = xfs_dir2_data_freefind(hdr, bf, prevdup);
|
|
be16_add_cpu(&prevdup->length, len);
|
|
*xfs_dir2_data_unused_tag_p(prevdup) =
|
|
cpu_to_be16((char *)prevdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, prevdup);
|
|
/*
|
|
* If the previous entry was in the table, the new entry
|
|
* is longer, so it will be in the table too. Remove
|
|
* the old one and add the new one.
|
|
*/
|
|
if (dfp) {
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
|
|
xfs_dir2_data_freeinsert(hdr, bf, prevdup, needlogp);
|
|
}
|
|
/*
|
|
* Otherwise we need a scan if the new entry is big enough.
|
|
*/
|
|
else {
|
|
needscan = be16_to_cpu(prevdup->length) >
|
|
be16_to_cpu(bf[2].length);
|
|
}
|
|
}
|
|
/*
|
|
* The following entry is free, merge with it.
|
|
*/
|
|
else if (postdup) {
|
|
dfp = xfs_dir2_data_freefind(hdr, bf, postdup);
|
|
newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset);
|
|
newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
|
|
newdup->length = cpu_to_be16(len + be16_to_cpu(postdup->length));
|
|
*xfs_dir2_data_unused_tag_p(newdup) =
|
|
cpu_to_be16((char *)newdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup);
|
|
/*
|
|
* If the following entry was in the table, the new entry
|
|
* is longer, so it will be in the table too. Remove
|
|
* the old one and add the new one.
|
|
*/
|
|
if (dfp) {
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
|
|
xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp);
|
|
}
|
|
/*
|
|
* Otherwise we need a scan if the new entry is big enough.
|
|
*/
|
|
else {
|
|
needscan = be16_to_cpu(newdup->length) >
|
|
be16_to_cpu(bf[2].length);
|
|
}
|
|
}
|
|
/*
|
|
* Neither neighbor is free. Make a new entry.
|
|
*/
|
|
else {
|
|
newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset);
|
|
newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
|
|
newdup->length = cpu_to_be16(len);
|
|
*xfs_dir2_data_unused_tag_p(newdup) =
|
|
cpu_to_be16((char *)newdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup);
|
|
xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp);
|
|
}
|
|
*needscanp = needscan;
|
|
}
|
|
|
|
/*
|
|
* Take a byte range out of an existing unused space and make it un-free.
|
|
*/
|
|
void
|
|
xfs_dir2_data_use_free(
|
|
struct xfs_da_args *args,
|
|
struct xfs_buf *bp,
|
|
xfs_dir2_data_unused_t *dup, /* unused entry */
|
|
xfs_dir2_data_aoff_t offset, /* starting offset to use */
|
|
xfs_dir2_data_aoff_t len, /* length to use */
|
|
int *needlogp, /* out: need to log header */
|
|
int *needscanp) /* out: need regen bestfree */
|
|
{
|
|
xfs_dir2_data_hdr_t *hdr; /* data block header */
|
|
xfs_dir2_data_free_t *dfp; /* bestfree pointer */
|
|
int matchback; /* matches end of freespace */
|
|
int matchfront; /* matches start of freespace */
|
|
int needscan; /* need to regen bestfree */
|
|
xfs_dir2_data_unused_t *newdup; /* new unused entry */
|
|
xfs_dir2_data_unused_t *newdup2; /* another new unused entry */
|
|
int oldlen; /* old unused entry's length */
|
|
struct xfs_dir2_data_free *bf;
|
|
|
|
hdr = bp->b_addr;
|
|
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
|
|
hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
|
|
ASSERT(be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG);
|
|
ASSERT(offset >= (char *)dup - (char *)hdr);
|
|
ASSERT(offset + len <= (char *)dup + be16_to_cpu(dup->length) - (char *)hdr);
|
|
ASSERT((char *)dup - (char *)hdr == be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)));
|
|
/*
|
|
* Look up the entry in the bestfree table.
|
|
*/
|
|
oldlen = be16_to_cpu(dup->length);
|
|
bf = args->dp->d_ops->data_bestfree_p(hdr);
|
|
dfp = xfs_dir2_data_freefind(hdr, bf, dup);
|
|
ASSERT(dfp || oldlen <= be16_to_cpu(bf[2].length));
|
|
/*
|
|
* Check for alignment with front and back of the entry.
|
|
*/
|
|
matchfront = (char *)dup - (char *)hdr == offset;
|
|
matchback = (char *)dup + oldlen - (char *)hdr == offset + len;
|
|
ASSERT(*needscanp == 0);
|
|
needscan = 0;
|
|
/*
|
|
* If we matched it exactly we just need to get rid of it from
|
|
* the bestfree table.
|
|
*/
|
|
if (matchfront && matchback) {
|
|
if (dfp) {
|
|
needscan = (bf[2].offset != 0);
|
|
if (!needscan)
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp,
|
|
needlogp);
|
|
}
|
|
}
|
|
/*
|
|
* We match the first part of the entry.
|
|
* Make a new entry with the remaining freespace.
|
|
*/
|
|
else if (matchfront) {
|
|
newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
|
|
newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
|
|
newdup->length = cpu_to_be16(oldlen - len);
|
|
*xfs_dir2_data_unused_tag_p(newdup) =
|
|
cpu_to_be16((char *)newdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup);
|
|
/*
|
|
* If it was in the table, remove it and add the new one.
|
|
*/
|
|
if (dfp) {
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
|
|
dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup,
|
|
needlogp);
|
|
ASSERT(dfp != NULL);
|
|
ASSERT(dfp->length == newdup->length);
|
|
ASSERT(be16_to_cpu(dfp->offset) == (char *)newdup - (char *)hdr);
|
|
/*
|
|
* If we got inserted at the last slot,
|
|
* that means we don't know if there was a better
|
|
* choice for the last slot, or not. Rescan.
|
|
*/
|
|
needscan = dfp == &bf[2];
|
|
}
|
|
}
|
|
/*
|
|
* We match the last part of the entry.
|
|
* Trim the allocated space off the tail of the entry.
|
|
*/
|
|
else if (matchback) {
|
|
newdup = dup;
|
|
newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup);
|
|
*xfs_dir2_data_unused_tag_p(newdup) =
|
|
cpu_to_be16((char *)newdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup);
|
|
/*
|
|
* If it was in the table, remove it and add the new one.
|
|
*/
|
|
if (dfp) {
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
|
|
dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup,
|
|
needlogp);
|
|
ASSERT(dfp != NULL);
|
|
ASSERT(dfp->length == newdup->length);
|
|
ASSERT(be16_to_cpu(dfp->offset) == (char *)newdup - (char *)hdr);
|
|
/*
|
|
* If we got inserted at the last slot,
|
|
* that means we don't know if there was a better
|
|
* choice for the last slot, or not. Rescan.
|
|
*/
|
|
needscan = dfp == &bf[2];
|
|
}
|
|
}
|
|
/*
|
|
* Poking out the middle of an entry.
|
|
* Make two new entries.
|
|
*/
|
|
else {
|
|
newdup = dup;
|
|
newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup);
|
|
*xfs_dir2_data_unused_tag_p(newdup) =
|
|
cpu_to_be16((char *)newdup - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup);
|
|
newdup2 = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
|
|
newdup2->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
|
|
newdup2->length = cpu_to_be16(oldlen - len - be16_to_cpu(newdup->length));
|
|
*xfs_dir2_data_unused_tag_p(newdup2) =
|
|
cpu_to_be16((char *)newdup2 - (char *)hdr);
|
|
xfs_dir2_data_log_unused(args, bp, newdup2);
|
|
/*
|
|
* If the old entry was in the table, we need to scan
|
|
* if the 3rd entry was valid, since these entries
|
|
* are smaller than the old one.
|
|
* If we don't need to scan that means there were 1 or 2
|
|
* entries in the table, and removing the old and adding
|
|
* the 2 new will work.
|
|
*/
|
|
if (dfp) {
|
|
needscan = (bf[2].length != 0);
|
|
if (!needscan) {
|
|
xfs_dir2_data_freeremove(hdr, bf, dfp,
|
|
needlogp);
|
|
xfs_dir2_data_freeinsert(hdr, bf, newdup,
|
|
needlogp);
|
|
xfs_dir2_data_freeinsert(hdr, bf, newdup2,
|
|
needlogp);
|
|
}
|
|
}
|
|
}
|
|
*needscanp = needscan;
|
|
}
|