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xfs: cleanup xfs_dir2_data_freescan_int 

Use an offset as the main means for iteration, and only do pointer
arithmetics to find the data/unused entries.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-11-08 15:05:34 -08:00 committed by Darrick J. Wong
parent 8073af5153
commit 62479f5734
1 changed files with 20 additions and 28 deletions
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48
fs/xfs/libxfs/xfs_dir2_data.c
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@ -562,16 +562,15 @@ xfs_dir2_data_freeremove(
*/
void
xfs_dir2_data_freescan_int(
struct xfs_da_geometry *geo,
const struct xfs_dir_ops *ops,
struct xfs_dir2_data_hdr *hdr,
int *loghead)
struct xfs_da_geometry *geo,
const struct xfs_dir_ops *ops,
struct xfs_dir2_data_hdr *hdr,
int *loghead)
{
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_dir2_data_free *bf = ops->data_bestfree_p(hdr);
void *addr = hdr;
unsigned int offset = ops->data_entry_offset;
unsigned int end;
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
@ -581,37 +580,30 @@ xfs_dir2_data_freescan_int(
/*
* Start by clearing the table.
*/
bf = ops->data_bestfree_p(hdr);
memset(bf, 0, sizeof(*bf) * XFS_DIR2_DATA_FD_COUNT);
*loghead = 1;
/*
* Set up pointers.
*/
p = (char *)ops->data_entry_p(hdr);
endp = xfs_dir3_data_endp(geo, hdr);
/*
* Loop over the block's entries.
*/
while (p < endp) {
dup = (xfs_dir2_data_unused_t *)p;
end = xfs_dir3_data_endp(geo, addr) - addr;
while (offset < end) {
struct xfs_dir2_data_unused *dup = addr + offset;
struct xfs_dir2_data_entry *dep = addr + offset;
/*
* If it's a free entry, insert it.
*/
if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
ASSERT((char *)dup - (char *)hdr ==
ASSERT(offset ==
be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)));
xfs_dir2_data_freeinsert(hdr, bf, dup, loghead);
p += be16_to_cpu(dup->length);
offset += be16_to_cpu(dup->length);
continue;
}
/*
* 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(*ops->data_entry_tag_p(dep)));
p += ops->data_entsize(dep->namelen);
}
ASSERT(offset == be16_to_cpu(*ops->data_entry_tag_p(dep)));
offset += ops->data_entsize(dep->namelen);
}
}