/*
* Remove bdi from the global list and shutdown any threads we have running
*/
static void wb_shutdown(struct bdi_writeback *wb)
{
/* Make sure nobody queues further work */
spin_lock_bh(&wb->work_lock);
if (!test_and_clear_bit(WB_registered, &wb->state)) {
spin_unlock_bh(&wb->work_lock);
/*
* Wait for wb shutdown to finish if someone else is just
* running wb_shutdown(). Otherwise we could proceed to wb /
* bdi destruction before wb_shutdown() is finished.
*/
wait_on_bit(&wb->state, WB_shutting_down, TASK_UNINTERRUPTIBLE);
return;
}
set_bit(WB_shutting_down, &wb->state);
spin_unlock_bh(&wb->work_lock);
cgwb_remove_from_bdi_list(wb);
/*
* Drain work list and shutdown the delayed_work. !WB_registered
* tells wb_workfn() that @wb is dying and its work_list needs to
* be drained no matter what.
*/
mod_delayed_work(bdi_wq, &wb->dwork, 0);
flush_delayed_work(&wb->dwork);
WARN_ON(!list_empty(&wb->work_list));
/*
* Make sure bit gets cleared after shutdown is finished. Matches with
* the barrier provided by test_and_clear_bit() above.
*/
smp_wmb();
clear_and_wake_up_bit(WB_shutting_down, &wb->state);
}
static int init_inode_xattrs(struct inode *inode)
{
struct erofs_vnode *const vi = EROFS_V(inode);
struct xattr_iter it;
unsigned int i;
struct erofs_xattr_ibody_header *ih;
struct super_block *sb;
struct erofs_sb_info *sbi;
bool atomic_map;
int ret = 0;
/* the most case is that xattrs of this inode are initialized. */
if (test_bit(EROFS_V_EA_INITED_BIT, &vi->flags))
return 0;
if (wait_on_bit_lock(&vi->flags, EROFS_V_BL_XATTR_BIT, TASK_KILLABLE))
return -ERESTARTSYS;
/* someone has initialized xattrs for us? */
if (test_bit(EROFS_V_EA_INITED_BIT, &vi->flags))
goto out_unlock;
/*
* bypass all xattr operations if ->xattr_isize is not greater than
* sizeof(struct erofs_xattr_ibody_header), in detail:
* 1) it is not enough to contain erofs_xattr_ibody_header then
* ->xattr_isize should be 0 (it means no xattr);
* 2) it is just to contain erofs_xattr_ibody_header, which is on-disk
* undefined right now (maybe use later with some new sb feature).
*/
if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) {
errln("xattr_isize %d of nid %llu is not supported yet",
vi->xattr_isize, vi->nid);
ret = -ENOTSUPP;
goto out_unlock;
} else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) {
if (unlikely(vi->xattr_isize)) {
DBG_BUGON(1);
ret = -EIO;
goto out_unlock; /* xattr ondisk layout error */
}
ret = -ENOATTR;
goto out_unlock;
}
sb = inode->i_sb;
sbi = EROFS_SB(sb);
it.blkaddr = erofs_blknr(iloc(sbi, vi->nid) + vi->inode_isize);
it.ofs = erofs_blkoff(iloc(sbi, vi->nid) + vi->inode_isize);
it.page = erofs_get_inline_page(inode, it.blkaddr);
if (IS_ERR(it.page)) {
ret = PTR_ERR(it.page);
goto out_unlock;
}
/* read in shared xattr array (non-atomic, see kmalloc below) */
it.kaddr = kmap(it.page);
atomic_map = false;
ih = (struct erofs_xattr_ibody_header *)(it.kaddr + it.ofs);
vi->xattr_shared_count = ih->h_shared_count;
vi->xattr_shared_xattrs = kmalloc_array(vi->xattr_shared_count,
sizeof(uint), GFP_KERNEL);
if (!vi->xattr_shared_xattrs) {
xattr_iter_end(&it, atomic_map);
ret = -ENOMEM;
goto out_unlock;
}
/* let's skip ibody header */
it.ofs += sizeof(struct erofs_xattr_ibody_header);
for (i = 0; i < vi->xattr_shared_count; ++i) {
if (unlikely(it.ofs >= EROFS_BLKSIZ)) {
/* cannot be unaligned */
BUG_ON(it.ofs != EROFS_BLKSIZ);
xattr_iter_end(&it, atomic_map);
it.page = erofs_get_meta_page(sb, ++it.blkaddr,
S_ISDIR(inode->i_mode));
if (IS_ERR(it.page)) {
kfree(vi->xattr_shared_xattrs);
vi->xattr_shared_xattrs = NULL;
ret = PTR_ERR(it.page);
goto out_unlock;
}
it.kaddr = kmap_atomic(it.page);
atomic_map = true;
it.ofs = 0;
}
vi->xattr_shared_xattrs[i] =
le32_to_cpu(*(__le32 *)(it.kaddr + it.ofs));
it.ofs += sizeof(__le32);
}
xattr_iter_end(&it, atomic_map);
set_bit(EROFS_V_EA_INITED_BIT, &vi->flags);
out_unlock:
clear_and_wake_up_bit(EROFS_V_BL_XATTR_BIT, &vi->flags);
return ret;
}
