9p: explicitly deny setlease attempts
[ Upstream commit 7a84602297
]
9p is a remote network protocol, and it doesn't support asynchronous
notifications from the server. Ensure that we don't hand out any leases
since we can't guarantee they'll be broken when a file's contents
change.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -691,6 +691,7 @@ const struct file_operations v9fs_file_operations = {
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.lock = v9fs_file_lock,
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.mmap = generic_file_readonly_mmap,
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.fsync = v9fs_file_fsync,
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.setlease = simple_nosetlease,
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};
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const struct file_operations v9fs_file_operations_dotl = {
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@ -726,4 +727,5 @@ const struct file_operations v9fs_mmap_file_operations_dotl = {
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.flock = v9fs_file_flock_dotl,
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.mmap = v9fs_mmap_file_mmap,
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.fsync = v9fs_file_fsync_dotl,
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.setlease = simple_nosetlease,
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};
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