Update Linux to v5.10.157
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.157.tar.xz
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I7b30d9e98d8c465d6b44de8e7433b4a40b3289ba
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 1d9262a..779b774 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -995,7 +995,6 @@
int ret = 0;
if (btrfs_is_free_space_inode(inode)) {
- WARN_ON_ONCE(1);
ret = -EINVAL;
goto out_unlock;
}
@@ -4023,6 +4022,13 @@
dest->root_key.objectid);
return -EPERM;
}
+ if (atomic_read(&dest->nr_swapfiles)) {
+ spin_unlock(&dest->root_item_lock);
+ btrfs_warn(fs_info,
+ "attempt to delete subvolume %llu with active swapfile",
+ root->root_key.objectid);
+ return -EPERM;
+ }
root_flags = btrfs_root_flags(&dest->root_item);
btrfs_set_root_flags(&dest->root_item,
root_flags | BTRFS_ROOT_SUBVOL_DEAD);
@@ -7474,7 +7480,19 @@
if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) ||
em->block_start == EXTENT_MAP_INLINE) {
free_extent_map(em);
- ret = -ENOTBLK;
+ /*
+ * If we are in a NOWAIT context, return -EAGAIN in order to
+ * fallback to buffered IO. This is not only because we can
+ * block with buffered IO (no support for NOWAIT semantics at
+ * the moment) but also to avoid returning short reads to user
+ * space - this happens if we were able to read some data from
+ * previous non-compressed extents and then when we fallback to
+ * buffered IO, at btrfs_file_read_iter() by calling
+ * filemap_read(), we fail to fault in pages for the read buffer,
+ * in which case filemap_read() returns a short read (the number
+ * of bytes previously read is > 0, so it does not return -EFAULT).
+ */
+ ret = (flags & IOMAP_NOWAIT) ? -EAGAIN : -ENOTBLK;
goto unlock_err;
}
@@ -10215,8 +10233,23 @@
* set. We use this counter to prevent snapshots. We must increment it
* before walking the extents because we don't want a concurrent
* snapshot to run after we've already checked the extents.
+ *
+ * It is possible that subvolume is marked for deletion but still not
+ * removed yet. To prevent this race, we check the root status before
+ * activating the swapfile.
*/
+ spin_lock(&root->root_item_lock);
+ if (btrfs_root_dead(root)) {
+ spin_unlock(&root->root_item_lock);
+
+ btrfs_exclop_finish(fs_info);
+ btrfs_warn(fs_info,
+ "cannot activate swapfile because subvolume %llu is being deleted",
+ root->root_key.objectid);
+ return -EPERM;
+ }
atomic_inc(&root->nr_swapfiles);
+ spin_unlock(&root->root_item_lock);
isize = ALIGN_DOWN(inode->i_size, fs_info->sectorsize);