Drain iput taskq inside z_teardown_lock #3282
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@chrisrd has this patch resolved the issue for you in practice? It's not 100% clear to me why pulling the |
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Followed up in #3281 (comment) |
By the time we're tearing down our superblock the VFS has started releasing
all our inodes/znodes. Some of this work may have been handed off to our
iput taskq so we need to wait for that work to complete. However the iput
from the taskq can itself result in additional work being added to the
taskq:
dsl_pool_iput_taskq
iput
iput_final
evict
destroy_inode
zpl_inode_destroy
zfs_inode_destroy
zfs_iput_async(ZTOI(zp->z_xattr_parent))
taskq_dispatch(dsl_pool_iput_taskq..., iput, ...)
Let's wait until all our znodes have been released.
Signed-off-by: Chris Dunlop <chris@onthe.net.au>
Closes openzfs#3281
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We need to hold the z_teardown_lock as a writer whilst draining the iput
taskq so the taskq isn't being filled up again behind us.
These changes revert commit @fd23720 and address the deadlock raised in
issue #1988 by removing ZFS_ENTER from zfs_putpage and zpl_writepages.
Also remove a redundant zil_commit from zpl_writepages.
Signed-off-by: Chris Dunlop chris@onthe.net.au
Closes #3281