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xfs: avoid usage of struct xfs_dir2_data

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In most places we can simply pass around and use the struct xfs_dir2_data_hdr,
which is the first and most important member of struct xfs_dir2_data instead
of the full structure.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Christoph Hellwig
2011-07-08 14:35:38 +02:00
parent a64b041797
commit c2066e2662
6 changed files with 236 additions and 231 deletions
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76
fs/xfs/xfs_dir2_leaf.c
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@@ -132,7 +132,7 @@ xfs_dir2_block_to_leaf(
*/
hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
if (needscan)
xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)hdr, &needlog);
xfs_dir2_data_freescan(mp, hdr, &needlog);
/*
* Set up leaf tail and bests table.
*/
@@ -278,7 +278,7 @@ xfs_dir2_leaf_addname(
{
__be16 *bestsp; /* freespace table in leaf */
int compact; /* need to compact leaves */
xfs_dir2_data_t *data; /* data block structure */
xfs_dir2_data_hdr_t *hdr; /* data block header */
xfs_dabuf_t *dbp; /* data block buffer */
xfs_dir2_data_entry_t *dep; /* data block entry */
xfs_inode_t *dp; /* incore directory inode */
@@ -486,8 +486,8 @@ xfs_dir2_leaf_addname(
*/
else
xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block);
data = dbp->data;
bestsp[use_block] = data->hdr.bestfree[0].length;
hdr = dbp->data;
bestsp[use_block] = hdr->bestfree[0].length;
grown = 1;
}
/*
@@ -501,7 +501,7 @@ xfs_dir2_leaf_addname(
xfs_da_brelse(tp, lbp);
return error;
}
data = dbp->data;
hdr = dbp->data;
grown = 0;
}
xfs_dir2_data_check(dp, dbp);
@@ -509,14 +509,14 @@ xfs_dir2_leaf_addname(
* Point to the biggest freespace in our data block.
*/
dup = (xfs_dir2_data_unused_t *)
((char *)data + be16_to_cpu(data->hdr.bestfree[0].offset));
((char *)hdr + be16_to_cpu(hdr->bestfree[0].offset));
ASSERT(be16_to_cpu(dup->length) >= length);
needscan = needlog = 0;
/*
* Mark the initial part of our freespace in use for the new entry.
*/
xfs_dir2_data_use_free(tp, dbp, dup,
(xfs_dir2_data_aoff_t)((char *)dup - (char *)data), length,
(xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), length,
&needlog, &needscan);
/*
* Initialize our new entry (at last).
@@ -526,12 +526,12 @@ xfs_dir2_leaf_addname(
dep->namelen = args->namelen;
memcpy(dep->name, args->name, dep->namelen);
tagp = xfs_dir2_data_entry_tag_p(dep);
*tagp = cpu_to_be16((char *)dep - (char *)data);
*tagp = cpu_to_be16((char *)dep - (char *)hdr);
/*
* Need to scan fix up the bestfree table.
*/
if (needscan)
xfs_dir2_data_freescan(mp, data, &needlog);
xfs_dir2_data_freescan(mp, hdr, &needlog);
/*
* Need to log the data block's header.
*/
@@ -542,8 +542,8 @@ xfs_dir2_leaf_addname(
* If the bests table needs to be changed, do it.
* Log the change unless we've already done that.
*/
if (be16_to_cpu(bestsp[use_block]) != be16_to_cpu(data->hdr.bestfree[0].length)) {
bestsp[use_block] = data->hdr.bestfree[0].length;
if (be16_to_cpu(bestsp[use_block]) != be16_to_cpu(hdr->bestfree[0].length)) {
bestsp[use_block] = hdr->bestfree[0].length;
if (!grown)
xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block);
}
@@ -786,6 +786,7 @@ xfs_dir2_leaf_getdents(
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_hdr_t *hdr; /* data block header */
xfs_dir2_data_entry_t *dep; /* data entry */
xfs_dir2_data_unused_t *dup; /* unused entry */
int error = 0; /* error return value */
@@ -1044,6 +1045,7 @@ xfs_dir2_leaf_getdents(
ASSERT(xfs_dir2_byte_to_db(mp, curoff) ==
curdb);
data = bp->data;
hdr = &data->hdr;
xfs_dir2_data_check(dp, bp);
/*
* Find our position in the block.
@@ -1054,12 +1056,12 @@ xfs_dir2_leaf_getdents(
* Skip past the header.
*/
if (byteoff == 0)
curoff += (uint)sizeof(data->hdr);
curoff += (uint)sizeof(*hdr);
/*
* Skip past entries until we reach our offset.
*/
else {
while ((char *)ptr - (char *)data < byteoff) {
while ((char *)ptr - (char *)hdr < byteoff) {
dup = (xfs_dir2_data_unused_t *)ptr;
if (be16_to_cpu(dup->freetag)
@@ -1080,8 +1082,8 @@ xfs_dir2_leaf_getdents(
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) {
(char *)ptr - (char *)hdr);
if (ptr >= (char *)hdr + mp->m_dirblksize) {
continue;
}
}
@@ -1462,7 +1464,7 @@ 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_data_hdr_t *hdr; /* data block header */
xfs_dir2_db_t db; /* data block number */
xfs_dabuf_t *dbp; /* data block buffer */
xfs_dir2_data_entry_t *dep; /* data entry structure */
@@ -1492,7 +1494,7 @@ xfs_dir2_leaf_removename(
tp = args->trans;
mp = dp->i_mount;
leaf = lbp->data;
data = dbp->data;
hdr = dbp->data;
xfs_dir2_data_check(dp, dbp);
/*
* Point to the leaf entry, use that to point to the data entry.
@@ -1500,9 +1502,9 @@ xfs_dir2_leaf_removename(
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)));
((char *)hdr + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(lep->address)));
needscan = needlog = 0;
oldbest = be16_to_cpu(data->hdr.bestfree[0].length);
oldbest = be16_to_cpu(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);
@@ -1510,7 +1512,7 @@ xfs_dir2_leaf_removename(
* 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_aoff_t)((char *)dep - (char *)hdr),
xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan);
/*
* We just mark the leaf entry stale by putting a null in it.
@@ -1524,23 +1526,23 @@ xfs_dir2_leaf_removename(
* log the data block header if necessary.
*/
if (needscan)
xfs_dir2_data_freescan(mp, data, &needlog);
xfs_dir2_data_freescan(mp, hdr, &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;
if (be16_to_cpu(hdr->bestfree[0].length) != oldbest) {
bestsp[db] = 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)) {
if (be16_to_cpu(hdr->bestfree[0].length) ==
mp->m_dirblksize - (uint)sizeof(*hdr)) {
ASSERT(db != mp->m_dirdatablk);
if ((error = xfs_dir2_shrink_inode(args, db, dbp))) {
/*
@@ -1711,9 +1713,6 @@ xfs_dir2_leaf_trim_data(
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 */
@@ -1732,20 +1731,21 @@ xfs_dir2_leaf_trim_data(
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));
#ifdef DEBUG
{
struct xfs_dir2_data_hdr *hdr = dbp->data;
ASSERT(be32_to_cpu(hdr->magic) == XFS_DIR2_DATA_MAGIC);
ASSERT(be16_to_cpu(hdr->bestfree[0].length) ==
mp->m_dirblksize - (uint)sizeof(*hdr));
ASSERT(db == be32_to_cpu(ltp->bestcount) - 1);
}
#endif
/*
* Get rid of the data block.
*/