search for: up_write

...Clear any active mappings and free foreign map table */ if (info->vma) { + struct mm_struct *mm = info->vma->vm_mm; + + down_write(&mm->mmap_sem); zap_page_range( info->vma, info->vma->vm_start, info->vma->vm_end - info->vma->vm_start, NULL); + up_write(&mm->mmap_sem); kfree(info->vma->vm_private_data); @@ -993,12 +997,13 @@ static void fast_flush_area(pending_req_ int tapidx) { struct gnttab_unmap_grant_ref unmap[BLKIF_MAX_SEGMENTS_PER_REQUEST*2]; - unsigned int i, invcount = 0; + unsigned int i, invcount = 0, locke...

..._sb(struct file_system_type *fs_type, int flags, s->s_flags |= MS_ACTIVE; } - mutex_lock(&s->s_root->d_inode->i_mutex); - root = lookup_one_len(subvol_name, s->s_root, strlen(subvol_name)); - mutex_unlock(&s->s_root->d_inode->i_mutex); - if (IS_ERR(root)) { - up_write(&s->s_umount); - deactivate_super(s); - error = PTR_ERR(root); - goto error; - } - if (!root->d_inode) { - dput(root); - up_write(&s->s_umount); - deactivate_super(s); - error = -ENXIO; - goto error; + if (!strcmp(subvol_name, ".")) + root = dget(s->s_root); +...

hello, Chris In the next several months, I will have a lot of spare time. I will be happy if you assign some work to me. I have learn linux kernel for years but only fix a few small bugs in IP stack. In the past few months, I read some EXT4/VFS codes. I began reading source of btrfs ten days ago and have read it twice now. Regards YZ

...RFS_I(inode)->root; mutex_lock(&inode->i_mutex); - err = d_invalidate(dentry); - if (err) - goto out_unlock; down_write(&root->fs_info->subvol_sem); @@ -827,7 +824,7 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file, inode->i_flags |= S_DEAD; out_up_write: up_write(&root->fs_info->subvol_sem); -out_unlock: + mutex_unlock(&inode->i_mutex); if (!err) { shrink_dcache_sb(root->fs_info->sb); -- 1.6.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordom...

...get_task_mm(current); - down_write(&svmm->mm->mmap_sem); + down_write(&current->mm->mmap_sem); svmm->mirror.ops = &nouveau_svmm; - ret = hmm_mirror_register(&svmm->mirror, svmm->mm); - if (ret == 0) { - cli->svm.svmm = svmm; - cli->svm.cli = cli; - } - up_write(&svmm->mm->mmap_sem); - mmput(svmm->mm); + ret = hmm_mirror_register(&svmm->mirror, current->mm); + if (ret) + goto out_mm_unlock; -done: + svmm->notifier.ops = &nouveau_mn_ops; + ret = __mmu_notifier_register(&svmm->notifier, current->mm); if (ret) - n...

...se(&block_group->cache_node, &info->block_group_cache_tree); - spin_lock(&block_group->space_info->lock); + down_write(&block_group->space_info->groups_sem); list_del(&block_group->list); - spin_unlock(&block_group->space_info->lock); + up_write(&block_group->space_info->groups_sem); kfree(block_group); } spin_unlock(&info->block_group_cache_lock); @@ -5142,9 +5082,9 @@ int btrfs_read_block_groups(struct btrfs_root *root) &space_info); BUG_ON(ret); cache->space_info = space_info; - spin_lock(&amp...

...state) xen_pfn_t *mfnp = data; struct mmap_batch_state *st = state; - put_user(*mfnp, st->user++); - - return 0; + return put_user(*mfnp, st->user++); } static struct vm_operations_struct privcmd_vm_ops; @@ -323,10 +321,8 @@ static long privcmd_ioctl_mmap_batch(void __user *udata) up_write(&mm->mmap_sem); if (state.err > 0) { - ret = 0; - state.user = m.arr; - traverse_pages(m.num, sizeof(xen_pfn_t), + ret = traverse_pages(m.num, sizeof(xen_pfn_t), &pagelist, mmap_return_errors, &state); } -- 1.7.0.4

...state) xen_pfn_t *mfnp = data; struct mmap_batch_state *st = state; - put_user(*mfnp, st->user++); - - return 0; + return put_user(*mfnp, st->user++); } static struct vm_operations_struct privcmd_vm_ops; @@ -323,10 +321,8 @@ static long privcmd_ioctl_mmap_batch(void __user *udata) up_write(&mm->mmap_sem); if (state.err > 0) { - ret = 0; - state.user = m.arr; - traverse_pages(m.num, sizeof(xen_pfn_t), + ret = traverse_pages(m.num, sizeof(xen_pfn_t), &pagelist, mmap_return_errors, &state); } -- 1.7.0.4

Hello, the following series of patches fixes some issues with OCFS2 quotas. The first patch modifies VFS quota locking, the next patch uses the fact to simplify OCFS2 quota locking and solves a few deadlock issues. The third and the fourth patches fix another possible deadlocks in OCFS2 quota code and the last patch is a minor cleanup. Honza

...nst them. In this case, I am not totally sure if the race condition that I found may happen with existing code or not. To be prudent, I decide to send this patch out. The race condition that I am looking at is as follows: ? CPU 0???????????????????????? CPU 1 ? -----???????????????????????? ----- up_write: ? owner = NULL; ? <release-barrier> ? count = 0; <rcu-free task structure> ? ????????????????????????? rwsem_can_spin_on_owner: ??????????????????????????? rcu_read_lock(); ??????????????????????????? read owner; ????????????????????????????? : ??????????????????????????? vcpu_is_pree...

...nst them. In this case, I am not totally sure if the race condition that I found may happen with existing code or not. To be prudent, I decide to send this patch out. The race condition that I am looking at is as follows: ? CPU 0???????????????????????? CPU 1 ? -----???????????????????????? ----- up_write: ? owner = NULL; ? <release-barrier> ? count = 0; <rcu-free task structure> ? ????????????????????????? rwsem_can_spin_on_owner: ??????????????????????????? rcu_read_lock(); ??????????????????????????? read owner; ????????????????????????????? : ??????????????????????????? vcpu_is_pree...

...t for all running shrinkers to complete. > + * > + * This is useful to guarantee that all shrinker invocations have seen an > + * update, before freeing memory, similar to rcu. > + */ > +static void synchronize_shrinkers(void) > +{ > + down_write(&pool_shrink_rwsem); > + up_write(&pool_shrink_rwsem); > +} > + > /** > * ttm_pool_fini - Cleanup a pool > * > diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h > index c55c07c3f0cb..025c8070dd86 100644 > --- a/include/linux/shrinker.h > +++ b/include/linux/shrinker.h > @@ -103,...

...filesystem state */ + fs_info->fs_state |= btrfs_super_flags(disk_super); + + btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY); + ret = btrfs_parse_options(tree_root, options); if (ret) { err = ret; @@ -2405,10 +2412,17 @@ int btrfs_commit_super(struct btrfs_root *root) up_write(&root->fs_info->cleanup_work_sem); trans = btrfs_join_transaction(root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); + ret = btrfs_commit_transaction(trans, root); BUG_ON(ret); + /* run commit again to drop the original snapshot */ trans = btrfs_join_transaction(root, 1)...

...wn_write(&ndev->reslock); ndev->nb_registered = false; mlx5_notifier_unregister(mvdev->mdev, &ndev->nb); @@ -2824,6 +2827,7 @@ static int mlx5_vdpa_suspend(struct vdpa_device *vdev) suspend_vq(ndev, mvq); } mlx5_vdpa_cvq_suspend(mvdev); + mvdev->suspended = true; up_write(&ndev->reslock); return 0; } -- 1.8.3.1

...mlx5_notifier_unregister(mvdev->mdev, &ndev->nb); > @@ -2824,6 +2827,7 @@ static int mlx5_vdpa_suspend(struct vdpa_device *vdev) > suspend_vq(ndev, mvq); > } > mlx5_vdpa_cvq_suspend(mvdev); > + mvdev->suspended = true; > up_write(&ndev->reslock); > return 0; > } > -- > 1.8.3.1 >

...ee_postorder_for_each_entry_safe(node, next_node, > - &amn->objects.rb_root, it.rb) { > - list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) { > - bo->mn = NULL; > - list_del_init(&bo->mn_list); > - } > - kfree(node); > - } > - up_write(&amn->lock); > - mutex_unlock(&adev->mn_lock); > - > - hmm_mirror_unregister(&amn->mirror); > - kfree(amn); > -} > - > -/** > - * amdgpu_hmm_mirror_release - callback to notify about mm destruction > - * > - * @mirror: the HMM mirror (mm) this call...

...0; @@ -2835,10 +2834,6 @@ static int mlx5_vdpa_reset(struct vdpa_device *vdev) init_group_to_asid_map(mvdev); ++mvdev->generation; - if (MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) { - if (mlx5_vdpa_create_mr(mvdev, NULL, 0)) - mlx5_vdpa_warn(mvdev, "create MR failed\n"); - } up_write(&ndev->reslock); return 0; @@ -2903,6 +2898,18 @@ static int mlx5_vdpa_set_map(struct vdpa_device *vdev, unsigned int asid, return err; } +static int mlx5_vdpa_reset_map(struct vdpa_device *vdev, unsigned int asid) +{ + struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev); + struct mlx5_vdp...

...vdev->mdev, &ndev->nb); >> @@ -2824,6 +2827,7 @@ static int mlx5_vdpa_suspend(struct vdpa_device *vdev) >> suspend_vq(ndev, mvq); >> } >> mlx5_vdpa_cvq_suspend(mvdev); >> + mvdev->suspended = true; >> up_write(&ndev->reslock); >> return 0; >> } >> -- >> 1.8.3.1 >>

...(struct ocfs2_super *osb) status = jbd2_journal_flush(journal->j_journal, 0); jbd2_journal_unlock_updates(journal->j_journal); if (status < 0) { + if (is_journal_aborted(journal->j_journal)) { + ocfs2_error(osb->sb, "jbd2 status: ABORT.\n"); + goto reset; + } up_write(&journal->j_trans_barrier); mlog_errno(status); goto finally; } +reset: ocfs2_inc_trans_id(journal); flushed = atomic_read(&journal->j_num_trans); diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c index c4426d12a2ad..e2e3400717b0 100644 --- a/fs/ocfs2/localall...

...amdgpu_mn *mn) > -{ > - if (mn) > - down_write(&mn->lock); > -} > - > -/** > - * amdgpu_mn_unlock - drop the write side lock for this notifier > - * > - * @mn: our notifier > - */ > -void amdgpu_mn_unlock(struct amdgpu_mn *mn) > -{ > - if (mn) > - up_write(&mn->lock); > -} > - > /** > * amdgpu_mn_invalidate_gfx - callback to notify about mm change > * > @@ -82,12 +60,19 @@ void amdgpu_mn_unlock(struct amdgpu_mn *mn) > * potentially dirty. > */ > static bool amdgpu_mn_invalidate_gfx(struct mmu_range_no...