forked from Minki/linux
xfs: scrub directory freespace
Check the free space information in a directory. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong
parent
a5c46e5e89
commit
df481968f3
@ -259,6 +259,493 @@ out:
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return error;
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}
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/*
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* Is this unused entry either in the bestfree or smaller than all of
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* them? We've already checked that the bestfrees are sorted longest to
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* shortest, and that there aren't any bogus entries.
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*/
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STATIC void
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xfs_scrub_directory_check_free_entry(
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struct xfs_scrub_context *sc,
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xfs_dablk_t lblk,
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struct xfs_dir2_data_free *bf,
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struct xfs_dir2_data_unused *dup)
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{
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struct xfs_dir2_data_free *dfp;
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unsigned int dup_length;
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dup_length = be16_to_cpu(dup->length);
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/* Unused entry is shorter than any of the bestfrees */
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if (dup_length < be16_to_cpu(bf[XFS_DIR2_DATA_FD_COUNT - 1].length))
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return;
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for (dfp = &bf[XFS_DIR2_DATA_FD_COUNT - 1]; dfp >= bf; dfp--)
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if (dup_length == be16_to_cpu(dfp->length))
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return;
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/* Unused entry should be in the bestfrees but wasn't found. */
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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}
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/* Check free space info in a directory data block. */
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STATIC int
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xfs_scrub_directory_data_bestfree(
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struct xfs_scrub_context *sc,
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xfs_dablk_t lblk,
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bool is_block)
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{
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struct xfs_dir2_data_unused *dup;
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struct xfs_dir2_data_free *dfp;
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struct xfs_buf *bp;
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struct xfs_dir2_data_free *bf;
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struct xfs_mount *mp = sc->mp;
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const struct xfs_dir_ops *d_ops;
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char *ptr;
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char *endptr;
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u16 tag;
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unsigned int nr_bestfrees = 0;
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unsigned int nr_frees = 0;
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unsigned int smallest_bestfree;
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int newlen;
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int offset;
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int error;
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d_ops = sc->ip->d_ops;
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if (is_block) {
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/* dir block format */
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if (lblk != XFS_B_TO_FSBT(mp, XFS_DIR2_DATA_OFFSET))
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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error = xfs_dir3_block_read(sc->tp, sc->ip, &bp);
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} else {
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/* dir data format */
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error = xfs_dir3_data_read(sc->tp, sc->ip, lblk, -1, &bp);
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}
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if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, lblk, &error))
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goto out;
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/* XXX: Check xfs_dir3_data_hdr.pad is zero once we start setting it. */
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/* Do the bestfrees correspond to actual free space? */
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bf = d_ops->data_bestfree_p(bp->b_addr);
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smallest_bestfree = UINT_MAX;
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for (dfp = &bf[0]; dfp < &bf[XFS_DIR2_DATA_FD_COUNT]; dfp++) {
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offset = be16_to_cpu(dfp->offset);
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if (offset == 0)
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continue;
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if (offset >= mp->m_dir_geo->blksize) {
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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goto out_buf;
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}
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dup = (struct xfs_dir2_data_unused *)(bp->b_addr + offset);
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tag = be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup));
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/* bestfree doesn't match the entry it points at? */
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if (dup->freetag != cpu_to_be16(XFS_DIR2_DATA_FREE_TAG) ||
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be16_to_cpu(dup->length) != be16_to_cpu(dfp->length) ||
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tag != ((char *)dup - (char *)bp->b_addr)) {
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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goto out_buf;
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}
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/* bestfree records should be ordered largest to smallest */
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if (smallest_bestfree < be16_to_cpu(dfp->length)) {
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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goto out_buf;
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}
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smallest_bestfree = be16_to_cpu(dfp->length);
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nr_bestfrees++;
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}
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/* Make sure the bestfrees are actually the best free spaces. */
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ptr = (char *)d_ops->data_entry_p(bp->b_addr);
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if (is_block) {
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struct xfs_dir2_block_tail *btp;
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btp = xfs_dir2_block_tail_p(mp->m_dir_geo, bp->b_addr);
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endptr = (char *)xfs_dir2_block_leaf_p(btp);
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} else
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endptr = (char *)bp->b_addr + BBTOB(bp->b_length);
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/* Iterate the entries, stopping when we hit or go past the end. */
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while (ptr < endptr) {
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dup = (struct xfs_dir2_data_unused *)ptr;
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/* Skip real entries */
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if (dup->freetag != cpu_to_be16(XFS_DIR2_DATA_FREE_TAG)) {
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struct xfs_dir2_data_entry *dep;
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dep = (struct xfs_dir2_data_entry *)ptr;
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newlen = d_ops->data_entsize(dep->namelen);
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if (newlen <= 0) {
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK,
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lblk);
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goto out_buf;
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}
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ptr += newlen;
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continue;
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}
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/* Spot check this free entry */
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tag = be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup));
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if (tag != ((char *)dup - (char *)bp->b_addr))
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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/*
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* Either this entry is a bestfree or it's smaller than
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* any of the bestfrees.
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*/
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xfs_scrub_directory_check_free_entry(sc, lblk, bf, dup);
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/* Move on. */
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newlen = be16_to_cpu(dup->length);
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if (newlen <= 0) {
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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goto out_buf;
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}
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ptr += newlen;
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if (ptr <= endptr)
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nr_frees++;
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}
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/* We're required to fill all the space. */
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if (ptr != endptr)
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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/* Did we see at least as many free slots as there are bestfrees? */
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if (nr_frees < nr_bestfrees)
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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out_buf:
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xfs_trans_brelse(sc->tp, bp);
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out:
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return error;
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}
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/*
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* Does the free space length in the free space index block ($len) match
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* the longest length in the directory data block's bestfree array?
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* Assume that we've already checked that the data block's bestfree
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* array is in order.
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*/
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STATIC void
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xfs_scrub_directory_check_freesp(
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struct xfs_scrub_context *sc,
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xfs_dablk_t lblk,
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struct xfs_buf *dbp,
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unsigned int len)
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{
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struct xfs_dir2_data_free *bf;
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struct xfs_dir2_data_free *dfp;
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int offset;
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if (len == 0)
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return;
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bf = sc->ip->d_ops->data_bestfree_p(dbp->b_addr);
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for (dfp = &bf[0]; dfp < &bf[XFS_DIR2_DATA_FD_COUNT]; dfp++) {
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offset = be16_to_cpu(dfp->offset);
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if (offset == 0)
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break;
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if (len == be16_to_cpu(dfp->length))
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return;
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/* Didn't find the best length in the bestfree data */
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break;
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}
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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}
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/* Check free space info in a directory leaf1 block. */
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STATIC int
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xfs_scrub_directory_leaf1_bestfree(
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struct xfs_scrub_context *sc,
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struct xfs_da_args *args,
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xfs_dablk_t lblk)
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{
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struct xfs_dir3_icleaf_hdr leafhdr;
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struct xfs_dir2_leaf_entry *ents;
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struct xfs_dir2_leaf_tail *ltp;
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struct xfs_dir2_leaf *leaf;
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struct xfs_buf *dbp;
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struct xfs_buf *bp;
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const struct xfs_dir_ops *d_ops = sc->ip->d_ops;
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struct xfs_da_geometry *geo = sc->mp->m_dir_geo;
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__be16 *bestp;
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__u16 best;
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__u32 hash;
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__u32 lasthash = 0;
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__u32 bestcount;
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unsigned int stale = 0;
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int i;
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int error;
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/* Read the free space block. */
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error = xfs_dir3_leaf_read(sc->tp, sc->ip, lblk, -1, &bp);
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if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, lblk, &error))
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goto out;
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leaf = bp->b_addr;
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d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
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ents = d_ops->leaf_ents_p(leaf);
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ltp = xfs_dir2_leaf_tail_p(geo, leaf);
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bestcount = be32_to_cpu(ltp->bestcount);
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bestp = xfs_dir2_leaf_bests_p(ltp);
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if (xfs_sb_version_hascrc(&sc->mp->m_sb)) {
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struct xfs_dir3_leaf_hdr *hdr3 = bp->b_addr;
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if (hdr3->pad != cpu_to_be32(0))
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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}
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/*
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* There should be as many bestfree slots as there are dir data
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* blocks that can fit under i_size.
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*/
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if (bestcount != xfs_dir2_byte_to_db(geo, sc->ip->i_d.di_size)) {
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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goto out;
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}
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/* Is the leaf count even remotely sane? */
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if (leafhdr.count > d_ops->leaf_max_ents(geo)) {
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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goto out;
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}
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/* Leaves and bests don't overlap in leaf format. */
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if ((char *)&ents[leafhdr.count] > (char *)bestp) {
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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goto out;
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}
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/* Check hash value order, count stale entries. */
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for (i = 0; i < leafhdr.count; i++) {
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hash = be32_to_cpu(ents[i].hashval);
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if (i > 0 && lasthash > hash)
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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lasthash = hash;
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if (ents[i].address == cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
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stale++;
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}
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if (leafhdr.stale != stale)
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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/* Check all the bestfree entries. */
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for (i = 0; i < bestcount; i++, bestp++) {
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best = be16_to_cpu(*bestp);
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if (best == NULLDATAOFF)
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continue;
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error = xfs_dir3_data_read(sc->tp, sc->ip,
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i * args->geo->fsbcount, -1, &dbp);
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if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, lblk,
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&error))
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continue;
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xfs_scrub_directory_check_freesp(sc, lblk, dbp, best);
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xfs_trans_brelse(sc->tp, dbp);
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}
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out:
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return error;
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}
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/* Check free space info in a directory freespace block. */
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STATIC int
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xfs_scrub_directory_free_bestfree(
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struct xfs_scrub_context *sc,
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struct xfs_da_args *args,
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xfs_dablk_t lblk)
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{
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struct xfs_dir3_icfree_hdr freehdr;
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struct xfs_buf *dbp;
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struct xfs_buf *bp;
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__be16 *bestp;
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__be16 best;
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unsigned int stale = 0;
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int i;
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int error;
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/* Read the free space block */
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error = xfs_dir2_free_read(sc->tp, sc->ip, lblk, &bp);
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if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, lblk, &error))
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goto out;
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if (xfs_sb_version_hascrc(&sc->mp->m_sb)) {
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struct xfs_dir3_free_hdr *hdr3 = bp->b_addr;
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if (hdr3->pad != cpu_to_be32(0))
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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}
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/* Check all the entries. */
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sc->ip->d_ops->free_hdr_from_disk(&freehdr, bp->b_addr);
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bestp = sc->ip->d_ops->free_bests_p(bp->b_addr);
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for (i = 0; i < freehdr.nvalid; i++, bestp++) {
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best = be16_to_cpu(*bestp);
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if (best == NULLDATAOFF) {
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stale++;
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continue;
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}
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error = xfs_dir3_data_read(sc->tp, sc->ip,
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(freehdr.firstdb + i) * args->geo->fsbcount,
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-1, &dbp);
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if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, lblk,
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&error))
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continue;
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xfs_scrub_directory_check_freesp(sc, lblk, dbp, best);
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xfs_trans_brelse(sc->tp, dbp);
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}
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if (freehdr.nused + stale != freehdr.nvalid)
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
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out:
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return error;
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}
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/* Check free space information in directories. */
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STATIC int
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xfs_scrub_directory_blocks(
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struct xfs_scrub_context *sc)
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{
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struct xfs_bmbt_irec got;
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struct xfs_da_args args;
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struct xfs_ifork *ifp;
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struct xfs_mount *mp = sc->mp;
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xfs_fileoff_t leaf_lblk;
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xfs_fileoff_t free_lblk;
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xfs_fileoff_t lblk;
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xfs_extnum_t idx;
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xfs_dablk_t dabno;
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bool found;
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int is_block = 0;
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int error;
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/* Ignore local format directories. */
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if (sc->ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
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sc->ip->i_d.di_format != XFS_DINODE_FMT_BTREE)
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return 0;
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ifp = XFS_IFORK_PTR(sc->ip, XFS_DATA_FORK);
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lblk = XFS_B_TO_FSB(mp, XFS_DIR2_DATA_OFFSET);
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leaf_lblk = XFS_B_TO_FSB(mp, XFS_DIR2_LEAF_OFFSET);
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free_lblk = XFS_B_TO_FSB(mp, XFS_DIR2_FREE_OFFSET);
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/* Is this a block dir? */
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args.dp = sc->ip;
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args.geo = mp->m_dir_geo;
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args.trans = sc->tp;
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error = xfs_dir2_isblock(&args, &is_block);
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if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, lblk, &error))
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goto out;
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/* Iterate all the data extents in the directory... */
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found = xfs_iext_lookup_extent(sc->ip, ifp, lblk, &idx, &got);
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while (found) {
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/* Block directories only have a single block at offset 0. */
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if (is_block &&
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(got.br_startoff > 0 ||
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got.br_blockcount != args.geo->fsbcount)) {
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK,
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got.br_startoff);
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break;
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}
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/* No more data blocks... */
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if (got.br_startoff >= leaf_lblk)
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break;
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/*
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* Check each data block's bestfree data.
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*
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* Iterate all the fsbcount-aligned block offsets in
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* this directory. The directory block reading code is
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* smart enough to do its own bmap lookups to handle
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* discontiguous directory blocks. When we're done
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* with the extent record, re-query the bmap at the
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* next fsbcount-aligned offset to avoid redundant
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* block checks.
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*/
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for (lblk = roundup((xfs_dablk_t)got.br_startoff,
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args.geo->fsbcount);
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lblk < got.br_startoff + got.br_blockcount;
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lblk += args.geo->fsbcount) {
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error = xfs_scrub_directory_data_bestfree(sc, lblk,
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is_block);
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if (error)
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goto out;
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}
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dabno = got.br_startoff + got.br_blockcount;
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lblk = roundup(dabno, args.geo->fsbcount);
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found = xfs_iext_lookup_extent(sc->ip, ifp, lblk, &idx, &got);
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}
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if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
||||
goto out;
|
||||
|
||||
/* Look for a leaf1 block, which has free info. */
|
||||
if (xfs_iext_lookup_extent(sc->ip, ifp, leaf_lblk, &idx, &got) &&
|
||||
got.br_startoff == leaf_lblk &&
|
||||
got.br_blockcount == args.geo->fsbcount &&
|
||||
!xfs_iext_get_extent(ifp, ++idx, &got)) {
|
||||
if (is_block) {
|
||||
xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
|
||||
goto out;
|
||||
}
|
||||
error = xfs_scrub_directory_leaf1_bestfree(sc, &args,
|
||||
leaf_lblk);
|
||||
if (error)
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
||||
goto out;
|
||||
|
||||
/* Scan for free blocks */
|
||||
lblk = free_lblk;
|
||||
found = xfs_iext_lookup_extent(sc->ip, ifp, lblk, &idx, &got);
|
||||
while (found) {
|
||||
/*
|
||||
* Dirs can't have blocks mapped above 2^32.
|
||||
* Single-block dirs shouldn't even be here.
|
||||
*/
|
||||
lblk = got.br_startoff;
|
||||
if (lblk & ~0xFFFFFFFFULL) {
|
||||
xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
|
||||
goto out;
|
||||
}
|
||||
if (is_block) {
|
||||
xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, lblk);
|
||||
goto out;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check each dir free block's bestfree data.
|
||||
*
|
||||
* Iterate all the fsbcount-aligned block offsets in
|
||||
* this directory. The directory block reading code is
|
||||
* smart enough to do its own bmap lookups to handle
|
||||
* discontiguous directory blocks. When we're done
|
||||
* with the extent record, re-query the bmap at the
|
||||
* next fsbcount-aligned offset to avoid redundant
|
||||
* block checks.
|
||||
*/
|
||||
for (lblk = roundup((xfs_dablk_t)got.br_startoff,
|
||||
args.geo->fsbcount);
|
||||
lblk < got.br_startoff + got.br_blockcount;
|
||||
lblk += args.geo->fsbcount) {
|
||||
error = xfs_scrub_directory_free_bestfree(sc, &args,
|
||||
lblk);
|
||||
if (error)
|
||||
goto out;
|
||||
}
|
||||
dabno = got.br_startoff + got.br_blockcount;
|
||||
lblk = roundup(dabno, args.geo->fsbcount);
|
||||
found = xfs_iext_lookup_extent(sc->ip, ifp, lblk, &idx, &got);
|
||||
}
|
||||
out:
|
||||
return error;
|
||||
}
|
||||
|
||||
/* Scrub a whole directory. */
|
||||
int
|
||||
xfs_scrub_directory(
|
||||
@ -290,6 +777,14 @@ xfs_scrub_directory(
|
||||
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
||||
return error;
|
||||
|
||||
/* Check the freespace. */
|
||||
error = xfs_scrub_directory_blocks(sc);
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
||||
return error;
|
||||
|
||||
/*
|
||||
* Check that every dirent we see can also be looked up by hash.
|
||||
* Userspace usually asks for a 32k buffer, so we will too.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user