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CIFS: Don't let read only caching for mandatory byte-range locked files

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If we have mandatory byte-range locks on a file we can't cache reads
because pagereading may have conflicts with these locks on the server.
That's why we should allow level2 oplocks for files without mandatory
locks only.

Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky
2012-12-24 14:41:19 +04:00
committed by Steve French
parent 88cf75aaaf
commit 63b7d3a41c
4 changed files with 57 additions and 2 deletions
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2
fs/cifs/smb2ops.c
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@@ -708,6 +708,7 @@ struct smb_version_values smb20_values = {
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
.cap_large_files = SMB2_LARGE_FILES,
.oplock_read = SMB2_OPLOCK_LEVEL_II,
};
struct smb_version_values smb21_values = {
@@ -725,6 +726,7 @@ struct smb_version_values smb21_values = {
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
.cap_large_files = SMB2_LARGE_FILES,
.oplock_read = SMB2_OPLOCK_LEVEL_II,
};
struct smb_version_values smb30_values = {