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afs: Provide mount-time configurable byte-range file locking emulation

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Provide byte-range file locking emulation that can be configured at mount
time to one of four modes:

 (1) flock=local.  Locking is done locally only and no reference is made to
     the server.

 (2) flock=openafs.  Byte-range locking is done locally only; whole-file
     locking is done with reference to the server.  Whole-file locks cannot
     be upgraded unless the client holds an exclusive lock.

 (3) flock=strict.  Byte-range and whole-file locking both require a
     sufficient whole-file lock on the server.

 (4) flock=write.  As strict, but the client always gets an exclusive
     whole-file lock on the server.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2019-04-25 14:26:52 +01:00
parent 80548b0399
commit 6c6c1d63c2
6 changed files with 120 additions and 9 deletions
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2
fs/afs/fsclient.c
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@@ -1902,7 +1902,7 @@ int afs_fs_set_lock(struct afs_fs_cursor *fc, afs_lock_type_t type)
*bp++ = htonl(type);
afs_use_fs_server(call, fc->cbi);
trace_afs_make_fs_call(call, &vnode->fid);
trace_afs_make_fs_calli(call, &vnode->fid, type);
afs_make_call(&fc->ac, call, GFP_NOFS);
return afs_wait_for_call_to_complete(call, &fc->ac);
}