static int __logfs_readdir(struct file *file, void *buf, filldir_t filldir)
{
struct inode *dir = file->f_dentry->d_inode;
loff_t pos = file->f_pos - IMPLICIT_NODES;
struct page *page;
struct logfs_disk_dentry *dd;
int full;
BUG_ON(pos < 0);
for (;; pos++) {
if (beyond_eof(dir, pos))
break;
if (!logfs_exist_block(dir, pos)) {
/* deleted dentry */
pos = dir_seek_data(dir, pos);
continue;
}
page = read_cache_page(dir->i_mapping, pos,
(filler_t *)logfs_readpage, NULL);
if (IS_ERR(page))
return PTR_ERR(page);
dd = kmap(page);
BUG_ON(dd->namelen == 0);
full = filldir(buf, (char *)dd->name, be16_to_cpu(dd->namelen),
pos, be64_to_cpu(dd->ino), dd->type);
kunmap(page);
page_cache_release(page);
if (full)
break;
}
file->f_pos = pos + IMPLICIT_NODES;
return 0;
}
static int logfs_delete_dd(struct inode *dir, loff_t pos)
{
/*
* Getting called with pos somewhere beyond eof is either a goofup
* within this file or means someone maliciously edited the
* (crc-protected) journal.
*/
BUG_ON(beyond_eof(dir, pos));
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
log_dir(" Delete dentry (%lx, %llx)\n", dir->i_ino, pos);
return logfs_delete(dir, pos, NULL);
}
/* FIXME: readdir currently has it's own dir_walk code. I don't see a good
* way to combine the two copies */
static int logfs_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *dir = file_inode(file);
loff_t pos;
struct page *page;
struct logfs_disk_dentry *dd;
if (ctx->pos < 0)
return -EINVAL;
if (!dir_emit_dots(file, ctx))
return 0;
pos = ctx->pos - 2;
BUG_ON(pos < 0);
for (;; pos++, ctx->pos++) {
bool full;
if (beyond_eof(dir, pos))
break;
if (!logfs_exist_block(dir, pos)) {
/* deleted dentry */
pos = dir_seek_data(dir, pos);
continue;
}
page = read_cache_page(dir->i_mapping, pos,
(filler_t *)logfs_readpage, NULL);
if (IS_ERR(page))
return PTR_ERR(page);
dd = kmap(page);
BUG_ON(dd->namelen == 0);
full = !dir_emit(ctx, (char *)dd->name,
be16_to_cpu(dd->namelen),
be64_to_cpu(dd->ino), dd->type);
kunmap(page);
page_cache_release(page);
if (full)
break;
}
return 0;
}
static struct page *logfs_get_dd_page(struct inode *dir, struct dentry *dentry)
{
struct qstr *name = &dentry->d_name;
struct page *page;
struct logfs_disk_dentry *dd;
u32 hash = hash_32(name->name, name->len, 0);
pgoff_t index;
int round;
if (name->len > LOGFS_MAX_NAMELEN)
return ERR_PTR(-ENAMETOOLONG);
for (round = 0; round < 20; round++) {
index = hash_index(hash, round);
if (beyond_eof(dir, index))
return NULL;
if (!logfs_exist_block(dir, index))
continue;
page = read_cache_page(dir->i_mapping, index,
(filler_t *)logfs_readpage, NULL);
if (IS_ERR(page))
return page;
dd = kmap_atomic(page, KM_USER0);
BUG_ON(dd->namelen == 0);
if (name->len != be16_to_cpu(dd->namelen) ||
memcmp(name->name, dd->name, name->len)) {
kunmap_atomic(dd, KM_USER0);
page_cache_release(page);
continue;
}
kunmap_atomic(dd, KM_USER0);
return page;
}
return NULL;
}
