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Robert Milkowski 7dc2993a9e NFSv4.0: nfs4_do_fsinfo() should not do implicit lease renewals Currently, each time nfs4_do_fsinfo() is called it will do an implicit NFS4 lease renewal, which is not compliant with the NFS4 specification. This can result in a lease being expired by an NFS server. Commit `83ca7f5ab3` ("NFS: Avoid PUTROOTFH when managing leases") introduced implicit client lease renewal in nfs4_do_fsinfo(), which can result in the NFSv4.0 lease to expire on a server side, and servers returning NFS4ERR_EXPIRED or NFS4ERR_STALE_CLIENTID. This can easily be reproduced by frequently unmounting a sub-mount, then stat'ing it to get it mounted again, which will delay or even completely prevent client from sending RENEW operations if no other NFS operations are issued. Eventually nfs server will expire client's lease and return an error on file access or next RENEW. This can also happen when a sub-mount is automatically unmounted due to inactivity (after nfs_mountpoint_expiry_timeout), then it is mounted again via stat(). This can result in a short window during which client's lease will expire on a server but not on a client. This specific case was observed on production systems. This patch removes the implicit lease renewal from nfs4_do_fsinfo(). Fixes: `83ca7f5ab3` ("NFS: Avoid PUTROOTFH when managing leases") Signed-off-by: Robert Milkowski <rmilkowski@gmail.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>		2020-02-04 12:27:55 -05:00
arch	Merge branch 'parisc-5.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux	2020-01-14 10:22:10 -08:00
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drivers	SCSI fixes on 20200114	2020-01-14 10:14:06 -08:00
fs	NFSv4.0: nfs4_do_fsinfo() should not do implicit lease renewals	2020-02-04 12:27:55 -05:00
include	nfs: optimise readdir cache page invalidation	2020-02-04 10:50:44 -05:00
init	mm, debug_pagealloc: don't rely on static keys too early	2020-01-13 18:19:02 -08:00
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kernel	Merge branch 'dhowells' (patches from DavidH)	2020-01-14 09:56:31 -08:00
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mm	mm: memcg/slab: call flush_memcg_workqueue() only if memcg workqueue is valid	2020-01-13 18:19:02 -08:00
net	SUNRPC: Use kmemdup_nul() in rpc_parse_scope_id()	2020-02-03 16:35:07 -05:00
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Makefile	Linux 5.5-rc6	2020-01-12 16:55:08 -08:00
README

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.