whiterose

linux unikernel
Log | Files | Refs | README | LICENSE | git clone https://git.ne02ptzero.me/git/whiterose

commit 121b018f8c74b4e0ba81b4b8ee73a82db3f24b7b
parent 5b26f7180cdb3406404e6da78741e4e57f9a999e
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed, 28 Nov 2018 08:38:20 -0800

Merge tag 'for-4.20-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:
 "Some of these bugs are being hit during testing so we'd like to get
  them merged, otherwise there are usual stability fixes for stable
  trees"

* tag 'for-4.20-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: relocation: set trans to be NULL after ending transaction
  Btrfs: fix race between enabling quotas and subvolume creation
  Btrfs: send, fix infinite loop due to directory rename dependencies
  Btrfs: ensure path name is null terminated at btrfs_control_ioctl
  Btrfs: fix rare chances for data loss when doing a fast fsync
  btrfs: Always try all copies when reading extent buffers

Diffstat:
Mfs/btrfs/disk-io.c | 11+----------
Mfs/btrfs/file.c | 24++++++++++++++++++++++++
Mfs/btrfs/qgroup.c | 3++-
Mfs/btrfs/relocation.c | 1+
Mfs/btrfs/send.c | 11++++++++---
Mfs/btrfs/super.c | 1+
6 files changed, 37 insertions(+), 14 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c @@ -477,9 +477,9 @@ static int btree_read_extent_buffer_pages(struct btrfs_fs_info *fs_info, int mirror_num = 0; int failed_mirror = 0; - clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); io_tree = &BTRFS_I(fs_info->btree_inode)->io_tree; while (1) { + clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); ret = read_extent_buffer_pages(io_tree, eb, WAIT_COMPLETE, mirror_num); if (!ret) { @@ -493,15 +493,6 @@ static int btree_read_extent_buffer_pages(struct btrfs_fs_info *fs_info, break; } - /* - * This buffer's crc is fine, but its contents are corrupted, so - * there is no reason to read the other copies, they won't be - * any less wrong. - */ - if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags) || - ret == -EUCLEAN) - break; - num_copies = btrfs_num_copies(fs_info, eb->start, eb->len); if (num_copies == 1) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c @@ -2089,6 +2089,30 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) atomic_inc(&root->log_batch); /* + * Before we acquired the inode's lock, someone may have dirtied more + * pages in the target range. We need to make sure that writeback for + * any such pages does not start while we are logging the inode, because + * if it does, any of the following might happen when we are not doing a + * full inode sync: + * + * 1) We log an extent after its writeback finishes but before its + * checksums are added to the csum tree, leading to -EIO errors + * when attempting to read the extent after a log replay. + * + * 2) We can end up logging an extent before its writeback finishes. + * Therefore after the log replay we will have a file extent item + * pointing to an unwritten extent (and no data checksums as well). + * + * So trigger writeback for any eventual new dirty pages and then we + * wait for all ordered extents to complete below. + */ + ret = start_ordered_ops(inode, start, end); + if (ret) { + inode_unlock(inode); + goto out; + } + + /* * We have to do this here to avoid the priority inversion of waiting on * IO of a lower priority task while holding a transaciton open. */ diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c @@ -2659,7 +2659,7 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid, int i; u64 *i_qgroups; struct btrfs_fs_info *fs_info = trans->fs_info; - struct btrfs_root *quota_root = fs_info->quota_root; + struct btrfs_root *quota_root; struct btrfs_qgroup *srcgroup; struct btrfs_qgroup *dstgroup; u32 level_size = 0; @@ -2669,6 +2669,7 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid, if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) goto out; + quota_root = fs_info->quota_root; if (!quota_root) { ret = -EINVAL; goto out; diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c @@ -3959,6 +3959,7 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc) restart: if (update_backref_cache(trans, &rc->backref_cache)) { btrfs_end_transaction(trans); + trans = NULL; continue; } diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c @@ -3340,7 +3340,8 @@ static void free_pending_move(struct send_ctx *sctx, struct pending_dir_move *m) kfree(m); } -static void tail_append_pending_moves(struct pending_dir_move *moves, +static void tail_append_pending_moves(struct send_ctx *sctx, + struct pending_dir_move *moves, struct list_head *stack) { if (list_empty(&moves->list)) { @@ -3351,6 +3352,10 @@ static void tail_append_pending_moves(struct pending_dir_move *moves, list_add_tail(&moves->list, stack); list_splice_tail(&list, stack); } + if (!RB_EMPTY_NODE(&moves->node)) { + rb_erase(&moves->node, &sctx->pending_dir_moves); + RB_CLEAR_NODE(&moves->node); + } } static int apply_children_dir_moves(struct send_ctx *sctx) @@ -3365,7 +3370,7 @@ static int apply_children_dir_moves(struct send_ctx *sctx) return 0; INIT_LIST_HEAD(&stack); - tail_append_pending_moves(pm, &stack); + tail_append_pending_moves(sctx, pm, &stack); while (!list_empty(&stack)) { pm = list_first_entry(&stack, struct pending_dir_move, list); @@ -3376,7 +3381,7 @@ static int apply_children_dir_moves(struct send_ctx *sctx) goto out; pm = get_pending_dir_moves(sctx, parent_ino); if (pm) - tail_append_pending_moves(pm, &stack); + tail_append_pending_moves(sctx, pm, &stack); } return 0; diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c @@ -2237,6 +2237,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd, vol = memdup_user((void __user *)arg, sizeof(*vol)); if (IS_ERR(vol)) return PTR_ERR(vol); + vol->name[BTRFS_PATH_NAME_MAX] = '\0'; switch (cmd) { case BTRFS_IOC_SCAN_DEV: