/*
* iterate through the data blob that lists the contents of an AFS directory
*/
static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie,
filldir_t filldir, struct key *key)
{
union afs_dir_block *dblock;
struct afs_dir_page *dbuf;
struct page *page;
unsigned blkoff, limit;
int ret;
_enter("{%lu},%u,,", dir->i_ino, *fpos);
if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
_leave(" = -ESTALE");
return -ESTALE;
}
/* round the file position up to the next entry boundary */
*fpos += sizeof(union afs_dirent) - 1;
*fpos &= ~(sizeof(union afs_dirent) - 1);
/* walk through the blocks in sequence */
ret = 0;
while (*fpos < dir->i_size) {
blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1);
/* fetch the appropriate page from the directory */
page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key);
if (IS_ERR(page)) {
ret = PTR_ERR(page);
break;
}
limit = blkoff & ~(PAGE_SIZE - 1);
dbuf = page_address(page);
/* deal with the individual blocks stashed on this page */
do {
dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
sizeof(union afs_dir_block)];
ret = afs_dir_iterate_block(fpos, dblock, blkoff,
cookie, filldir);
if (ret != 1) {
afs_dir_put_page(page);
goto out;
}
blkoff += sizeof(union afs_dir_block);
} while (*fpos < dir->i_size && blkoff < limit);
afs_dir_put_page(page);
ret = 0;
}
out:
_leave(" = %d", ret);
return ret;
}
/*
* get a page into the pagecache
*/
static struct page *afs_dir_get_page(struct inode *dir, unsigned long index,
struct key *key)
{
struct page *page;
struct file file = {
.private_data = key,
};
_enter("{%lu},%lu", dir->i_ino, index);
page = read_mapping_page(dir->i_mapping, index, &file);
if (!IS_ERR(page)) {
kmap(page);
if (!PageChecked(page))
afs_dir_check_page(dir, page);
if (PageError(page))
goto fail;
}
return page;
fail:
afs_dir_put_page(page);
_leave(" = -EIO");
return ERR_PTR(-EIO);
}
/*
* get a page into the pagecache
*/
static struct page *afs_dir_get_page(struct inode *dir, unsigned long index)
{
struct page *page;
_enter("{%lu},%lu", dir->i_ino, index);
page = read_mapping_page(dir->i_mapping, index, NULL);
if (!IS_ERR(page)) {
kmap(page);
if (!PageChecked(page))
afs_dir_check_page(dir, page);
if (PageError(page))
goto fail;
}
return page;
fail:
afs_dir_put_page(page);
return ERR_PTR(-EIO);
} /* end afs_dir_get_page() */
/*
* get a page into the pagecache
*/
static struct page *afs_dir_get_page(struct inode *dir, unsigned long index,
struct key *key)
{
struct page *page;
_enter("{%lu},%lu", dir->i_ino, index);
page = read_cache_page(dir->i_mapping, index, afs_page_filler, key);
if (!IS_ERR(page)) {
kmap(page);
if (unlikely(!PageChecked(page))) {
if (PageError(page) || !afs_dir_check_page(dir, page))
goto fail;
}
}
return page;
fail:
afs_dir_put_page(page);
_leave(" = -EIO");
return ERR_PTR(-EIO);
}
/*
* get a page into the pagecache
*/
static struct page *afs_dir_get_page(struct inode *dir, unsigned long index)
{
struct page *page;
_enter("{%lu},%lu",dir->i_ino,index);
page = read_cache_page(dir->i_mapping,index,
(filler_t*)dir->i_mapping->a_ops->readpage,NULL);
if (!IS_ERR(page)) {
wait_on_page_locked(page);
kmap(page);
if (!PageUptodate(page))
goto fail;
if (!PageChecked(page))
afs_dir_check_page(dir,page);
if (PageError(page))
goto fail;
}
return page;
fail:
afs_dir_put_page(page);
return ERR_PTR(-EIO);
} /* end afs_dir_get_page() */
