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9p: explicitly deny setlease attempts

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[ Upstream commit 7a84602297d36617dbdadeba55a2567031e5165b ]

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 <[email protected]>
Signed-off-by: Eric Van Hensbergen <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Jeff Layton 2024-03-19 12:34:45 -04:00 • committed by Greg Kroah-Hartman
commit f633cf1da1
1 changed files with 2 additions and 0 deletions
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fs/9p/vfs_file.c
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@ -676,6 +676,7 @@ const struct file_operations v9fs_file_operations = {
.lock = v9fs_file_lock,
.mmap = generic_file_readonly_mmap,
.fsync = v9fs_file_fsync,
.setlease = simple_nosetlease,
};
const struct file_operations v9fs_file_operations_dotl = {
@ -711,4 +712,5 @@ const struct file_operations v9fs_mmap_file_operations_dotl = {
.flock = v9fs_file_flock_dotl,
.mmap = v9fs_mmap_file_mmap,
.fsync = v9fs_file_fsync_dotl,
.setlease = simple_nosetlease,
};