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xfs: remove the ->data_dot_entry_p and ->data_dotdot_entry_p methods 

The only user of the ->data_dot_entry_p and ->data_dotdot_entry_p
methods is the xfs_dir2_sf_to_block function that builds block format
directorys from a short form directory.  It already uses pointer
arithmetics with a offset variable to do so for the real entries in
the directory, so switch the generation of the . and .. entries to
the same scheme, and clean up some of the later pointer arithmetics
to use bp->b_addr directly as well and avoid some casts.

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 15:05:31 -08:00 committed by Darrick J. Wong
parent 2eb68a5d36
commit da3ca0df8b
3 changed files with 26 additions and 84 deletions
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52
fs/xfs/libxfs/xfs_da_format.c
View File

@ -111,52 +111,6 @@ xfs_dir3_data_entry_tag_p(
xfs_dir3_data_entsize(dep->namelen) - sizeof(__be16));
}
/*
* location of . and .. in data space (always block 0)
*/
static struct xfs_dir2_data_entry *
xfs_dir2_data_dot_entry_p(
struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
((char *)hdr + sizeof(struct xfs_dir2_data_hdr));
}
static struct xfs_dir2_data_entry *
xfs_dir2_data_dotdot_entry_p(
struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
((char *)hdr + sizeof(struct xfs_dir2_data_hdr) +
XFS_DIR2_DATA_ENTSIZE(1));
}
static struct xfs_dir2_data_entry *
xfs_dir2_ftype_data_dotdot_entry_p(
struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
((char *)hdr + sizeof(struct xfs_dir2_data_hdr) +
XFS_DIR3_DATA_ENTSIZE(1));
}
static struct xfs_dir2_data_entry *
xfs_dir3_data_dot_entry_p(
struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
((char *)hdr + sizeof(struct xfs_dir3_data_hdr));
}
static struct xfs_dir2_data_entry *
xfs_dir3_data_dotdot_entry_p(
struct xfs_dir2_data_hdr *hdr)
{
return (struct xfs_dir2_data_entry *)
((char *)hdr + sizeof(struct xfs_dir3_data_hdr) +
XFS_DIR3_DATA_ENTSIZE(1));
}
static struct xfs_dir2_data_free *
xfs_dir2_data_bestfree_p(struct xfs_dir2_data_hdr *hdr)
{
@ -209,8 +163,6 @@ static const struct xfs_dir_ops xfs_dir2_ops = {
XFS_DIR2_DATA_ENTSIZE(2),
.data_entry_offset = sizeof(struct xfs_dir2_data_hdr),
.data_dot_entry_p = xfs_dir2_data_dot_entry_p,
.data_dotdot_entry_p = xfs_dir2_data_dotdot_entry_p,
.data_entry_p = xfs_dir2_data_entry_p,
.data_unused_p = xfs_dir2_data_unused_p,
};
@ -227,8 +179,6 @@ static const struct xfs_dir_ops xfs_dir2_ftype_ops = {
XFS_DIR3_DATA_ENTSIZE(2),
.data_entry_offset = sizeof(struct xfs_dir2_data_hdr),
.data_dot_entry_p = xfs_dir2_data_dot_entry_p,
.data_dotdot_entry_p = xfs_dir2_ftype_data_dotdot_entry_p,
.data_entry_p = xfs_dir2_data_entry_p,
.data_unused_p = xfs_dir2_data_unused_p,
};
@ -245,8 +195,6 @@ static const struct xfs_dir_ops xfs_dir3_ops = {
XFS_DIR3_DATA_ENTSIZE(2),
.data_entry_offset = sizeof(struct xfs_dir3_data_hdr),
.data_dot_entry_p = xfs_dir3_data_dot_entry_p,
.data_dotdot_entry_p = xfs_dir3_data_dotdot_entry_p,
.data_entry_p = xfs_dir3_data_entry_p,
.data_unused_p = xfs_dir3_data_unused_p,
};

4
fs/xfs/libxfs/xfs_dir2.h
View File

@ -43,10 +43,6 @@ struct xfs_dir_ops {
xfs_dir2_data_aoff_t data_first_offset;
size_t data_entry_offset;
struct xfs_dir2_data_entry *
(*data_dot_entry_p)(struct xfs_dir2_data_hdr *hdr);
struct xfs_dir2_data_entry *
(*data_dotdot_entry_p)(struct xfs_dir2_data_hdr *hdr);
struct xfs_dir2_data_entry *
(*data_entry_p)(struct xfs_dir2_data_hdr *hdr);
struct xfs_dir2_data_unused *

54
fs/xfs/libxfs/xfs_dir2_block.c
View File

@ -1038,39 +1038,35 @@ xfs_dir2_leaf_to_block(
*/
int /* error */
xfs_dir2_sf_to_block(
xfs_da_args_t *args) /* operation arguments */
struct xfs_da_args *args)
{
struct xfs_trans *tp = args->trans;
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(dp, XFS_DATA_FORK);
xfs_dir2_db_t blkno; /* dir-relative block # (0) */
xfs_dir2_data_hdr_t *hdr; /* block header */
xfs_dir2_leaf_entry_t *blp; /* block leaf entries */
struct xfs_buf *bp; /* block buffer */
xfs_dir2_block_tail_t *btp; /* block tail pointer */
xfs_dir2_data_entry_t *dep; /* data entry pointer */
xfs_inode_t *dp; /* incore directory inode */
int dummy; /* trash */
xfs_dir2_data_unused_t *dup; /* unused entry pointer */
int endoffset; /* end of data objects */
int error; /* error return value */
int i; /* index */
xfs_mount_t *mp; /* filesystem mount point */
int needlog; /* need to log block header */
int needscan; /* need to scan block freespc */
int newoffset; /* offset from current entry */
int offset; /* target block offset */
unsigned int offset = dp->d_ops->data_entry_offset;
xfs_dir2_sf_entry_t *sfep; /* sf entry pointer */
xfs_dir2_sf_hdr_t *oldsfp; /* old shortform header */
xfs_dir2_sf_hdr_t *sfp; /* shortform header */
__be16 *tagp; /* end of data entry */
xfs_trans_t *tp; /* transaction pointer */
struct xfs_name name;
struct xfs_ifork *ifp;
trace_xfs_dir2_sf_to_block(args);
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
ifp = XFS_IFORK_PTR(dp, XFS_DATA_FORK);
ASSERT(ifp->if_flags & XFS_IFINLINE);
ASSERT(dp->i_d.di_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
@ -1139,35 +1135,37 @@ xfs_dir2_sf_to_block(
be16_to_cpu(dup->length), &needlog, &needscan);
if (error)
goto out_free;
/*
* Create entry for .
*/
dep = dp->d_ops->data_dot_entry_p(hdr);
dep = bp->b_addr + offset;
dep->inumber = cpu_to_be64(dp->i_ino);
dep->namelen = 1;
dep->name[0] = '.';
dp->d_ops->data_put_ftype(dep, XFS_DIR3_FT_DIR);
tagp = dp->d_ops->data_entry_tag_p(dep);
*tagp = cpu_to_be16((char *)dep - (char *)hdr);
*tagp = cpu_to_be16(offset);
xfs_dir2_data_log_entry(args, bp, dep);
blp[0].hashval = cpu_to_be32(xfs_dir_hash_dot);
blp[0].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(
(char *)dep - (char *)hdr));
blp[0].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(offset));
offset += dp->d_ops->data_entsize(dep->namelen);
/*
* Create entry for ..
*/
dep = dp->d_ops->data_dotdot_entry_p(hdr);
dep = bp->b_addr + offset;
dep->inumber = cpu_to_be64(xfs_dir2_sf_get_parent_ino(sfp));
dep->namelen = 2;
dep->name[0] = dep->name[1] = '.';
dp->d_ops->data_put_ftype(dep, XFS_DIR3_FT_DIR);
tagp = dp->d_ops->data_entry_tag_p(dep);
*tagp = cpu_to_be16((char *)dep - (char *)hdr);
*tagp = cpu_to_be16(offset);
xfs_dir2_data_log_entry(args, bp, dep);
blp[1].hashval = cpu_to_be32(xfs_dir_hash_dotdot);
blp[1].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(
(char *)dep - (char *)hdr));
offset = dp->d_ops->data_first_offset;
blp[1].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(offset));
offset += dp->d_ops->data_entsize(dep->namelen);
/*
* Loop over existing entries, stuff them in.
*/
@ -1176,6 +1174,7 @@ xfs_dir2_sf_to_block(
sfep = NULL;
else
sfep = xfs_dir2_sf_firstentry(sfp);
/*
* Need to preserve the existing offset values in the sf directory.
* Insert holes (unused entries) where necessary.
@ -1192,11 +1191,10 @@ xfs_dir2_sf_to_block(
* There should be a hole here, make one.
*/
if (offset < newoffset) {
dup = (xfs_dir2_data_unused_t *)((char *)hdr + offset);
dup = bp->b_addr + offset;
dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
dup->length = cpu_to_be16(newoffset - offset);
*xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16(
((char *)dup - (char *)hdr));
*xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16(offset);
xfs_dir2_data_log_unused(args, bp, dup);
xfs_dir2_data_freeinsert(hdr,
dp->d_ops->data_bestfree_p(hdr),
@ -1207,20 +1205,20 @@ xfs_dir2_sf_to_block(
/*
* Copy a real entry.
*/
dep = (xfs_dir2_data_entry_t *)((char *)hdr + newoffset);
dep = bp->b_addr + newoffset;
dep->inumber = cpu_to_be64(xfs_dir2_sf_get_ino(mp, sfp, sfep));
dep->namelen = sfep->namelen;
dp->d_ops->data_put_ftype(dep, xfs_dir2_sf_get_ftype(mp, sfep));
memcpy(dep->name, sfep->name, dep->namelen);
tagp = dp->d_ops->data_entry_tag_p(dep);
*tagp = cpu_to_be16((char *)dep - (char *)hdr);
*tagp = cpu_to_be16(newoffset);
xfs_dir2_data_log_entry(args, bp, dep);
name.name = sfep->name;
name.len = sfep->namelen;
blp[2 + i].hashval = cpu_to_be32(mp->m_dirnameops->
hashname(&name));
blp[2 + i].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(
(char *)dep - (char *)hdr));
blp[2 + i].hashval =
cpu_to_be32(mp->m_dirnameops->hashname(&name));
blp[2 + i].address =
cpu_to_be32(xfs_dir2_byte_to_dataptr(newoffset));
offset = (int)((char *)(tagp + 1) - (char *)hdr);
if (++i == sfp->count)
sfep = NULL;