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for-5.0-rc1-tag

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Merge tag 'for-5.0-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:

 - two regression fixes in clone/dedupe ioctls, the generic check
   callback needs to lock extents properly and wait for io to avoid
   problems with writeback and relocation

 - fix deadlock when using free space tree due to block group creation

 - a recently added check refuses a valid fileystem with seeding device,
   make that work again with a quickfix, proper solution needs more
   intrusive changes

* tag 'for-5.0-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: Use real device structure to verify dev extent
  Btrfs: fix deadlock when using free space tree due to block group creation
  Btrfs: fix race between reflink/dedupe and relocation
  Btrfs: fix race between cloning range ending at eof and writeback
This commit is contained in:
Linus Torvalds 2019-01-14 05:55:51 +12:00
commit 6b529fb0a3
3 changed files with 64 additions and 13 deletions
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16
fs/btrfs/ctree.c
View File

@ -1016,19 +1016,21 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
parent_start = parent->start;
/*
* If we are COWing a node/leaf from the extent, chunk or device trees,
* make sure that we do not finish block group creation of pending block
* groups. We do this to avoid a deadlock.
* If we are COWing a node/leaf from the extent, chunk, device or free
* space trees, make sure that we do not finish block group creation of
* pending block groups. We do this to avoid a deadlock.
* COWing can result in allocation of a new chunk, and flushing pending
* block groups (btrfs_create_pending_block_groups()) can be triggered
* when finishing allocation of a new chunk. Creation of a pending block
* group modifies the extent, chunk and device trees, therefore we could
* deadlock with ourselves since we are holding a lock on an extent
* buffer that btrfs_create_pending_block_groups() may try to COW later.
* group modifies the extent, chunk, device and free space trees,
* therefore we could deadlock with ourselves since we are holding a
* lock on an extent buffer that btrfs_create_pending_block_groups() may
* try to COW later.
*/
if (root == fs_info->extent_root ||
root == fs_info->chunk_root ||
root == fs_info->dev_root)
root == fs_info->dev_root ||
root == fs_info->free_space_root)
trans->can_flush_pending_bgs = false;
cow = btrfs_alloc_tree_block(trans, root, parent_start,

49
fs/btrfs/ioctl.c
View File

@ -3221,6 +3221,26 @@ static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2)
inode_lock_nested(inode2, I_MUTEX_CHILD);
}
static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
struct inode *inode2, u64 loff2, u64 len)
{
unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
}
static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
struct inode *inode2, u64 loff2, u64 len)
{
if (inode1 < inode2) {
swap(inode1, inode2);
swap(loff1, loff2);
} else if (inode1 == inode2 && loff2 < loff1) {
swap(loff1, loff2);
}
lock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
lock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
}
static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 olen,
struct inode *dst, u64 dst_loff)
{
@ -3242,11 +3262,12 @@ static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 olen,
return -EINVAL;
/*
* Lock destination range to serialize with concurrent readpages().
* Lock destination range to serialize with concurrent readpages() and
* source range to serialize with relocation.
*/
lock_extent(&BTRFS_I(dst)->io_tree, dst_loff, dst_loff + len - 1);
btrfs_double_extent_lock(src, loff, dst, dst_loff, len);
ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);
unlock_extent(&BTRFS_I(dst)->io_tree, dst_loff, dst_loff + len - 1);
btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
return ret;
}
@ -3905,17 +3926,33 @@ static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
len = ALIGN(src->i_size, bs) - off;
if (destoff > inode->i_size) {
const u64 wb_start = ALIGN_DOWN(inode->i_size, bs);
ret = btrfs_cont_expand(inode, inode->i_size, destoff);
if (ret)
return ret;
/*
* We may have truncated the last block if the inode's size is
* not sector size aligned, so we need to wait for writeback to
* complete before proceeding further, otherwise we can race
* with cloning and attempt to increment a reference to an
* extent that no longer exists (writeback completed right after
* we found the previous extent covering eof and before we
* attempted to increment its reference count).
*/
ret = btrfs_wait_ordered_range(inode, wb_start,
destoff - wb_start);
if (ret)
return ret;
}
/*
* Lock destination range to serialize with concurrent readpages().
* Lock destination range to serialize with concurrent readpages() and
* source range to serialize with relocation.
*/
lock_extent(&BTRFS_I(inode)->io_tree, destoff, destoff + len - 1);
btrfs_double_extent_lock(src, off, inode, destoff, len);
ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
unlock_extent(&BTRFS_I(inode)->io_tree, destoff, destoff + len - 1);
btrfs_double_extent_unlock(src, off, inode, destoff, len);
/*
* Truncate page cache pages so that future reads will see the cloned
* data immediately and not the previous data.

12
fs/btrfs/volumes.c
View File

@ -7825,6 +7825,18 @@ static int verify_one_dev_extent(struct btrfs_fs_info *fs_info,
ret = -EUCLEAN;
goto out;
}
/* It's possible this device is a dummy for seed device */
if (dev->disk_total_bytes == 0) {
dev = find_device(fs_info->fs_devices->seed, devid, NULL);
if (!dev) {
btrfs_err(fs_info, "failed to find seed devid %llu",
devid);
ret = -EUCLEAN;
goto out;
}
}
if (physical_offset + physical_len > dev->disk_total_bytes) {
btrfs_err(fs_info,
"dev extent devid %llu physical offset %llu len %llu is beyond device boundary %llu",