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NFS/pnfs: Fix a live lock between recalled layouts and layoutget

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BugLink: https://bugs.launchpad.net/bugs/2102266

commit 62e2a47ceab8f3f7d2e3f0e03fdd1c5e0059fd8b upstream.

When the server is recalling a layout, we should ignore the count of
outstanding layoutget calls, since the server is expected to return
either NFS4ERR_RECALLCONFLICT or NFS4ERR_RETURNCONFLICT for as long as
the recall is outstanding.
Currently, we may end up livelocking, causing the layout to eventually
be forcibly revoked.

Fixes: bf0291dd22 ("pNFS: Ensure LAYOUTGET and LAYOUTRETURN are properly serialised")
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Mehmet Basaran <mehmet.basaran@canonical.com>
This commit is contained in:
Trond Myklebust
2025-03-14 12:03:09 +09:00
committed by Mehmet Basaran
parent 977529f777
commit d571e88643
1 changed files with 1 additions and 1 deletions
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fs/nfs/pnfs.c
+1 -1
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@@ -1196,7 +1196,7 @@ pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
enum pnfs_iomode *iomode)
{
/* Serialise LAYOUTGET/LAYOUTRETURN */
if (atomic_read(&lo->plh_outstanding) != 0)
if (atomic_read(&lo->plh_outstanding) != 0 && lo->plh_return_seq == 0)
return false;
if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
return false;