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authorSteve French <sfrench@us.ibm.com>2009-02-23 15:21:59 +0000
committerSteve French <sfrench@us.ibm.com>2009-03-12 01:36:20 +0000
commitbe652445fdccb8e5d4391928c3b45324ea37f9e1 (patch)
tree9912b7022b06d3ad08ff73d71505f018fe96922b /fs/cifs/CHANGES
parent10e70afa75c90702b2326abaaa757d6b7835636f (diff)
[CIFS] Add new nostrictsync cifs mount option to avoid slow SMB flush
If this mount option is set, when an application does an fsync call then the cifs client does not send an SMB Flush to the server (to force the server to write all dirty data for this file immediately to disk), although cifs still sends all dirty (cached) file data to the server and waits for the server to respond to the write write. Since SMB Flush can be very slow, and some servers may be reliable enough (to risk delaying slightly flushing the data to disk on the server), turning on this option may be useful to improve performance for applications that fsync too much, at a small risk of server crash. If this mount option is not set, by default cifs will send an SMB flush request (and wait for a response) on every fsync call. Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/CHANGES')
-rw-r--r--fs/cifs/CHANGES4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index d43e0fe3339..b33c8412e2c 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -8,7 +8,9 @@ user's smb session. This fix allows cifs to mount multiple times to the
same server with different userids without risking invalidating earlier
established security contexts. fsync now sends SMB Flush operation
to better ensure that we wait for server to write all of the data to
-server disk (not just write it over the network).
+server disk (not just write it over the network). Add new mount
+parameter to allow user to disable sending the (slow) SMB flush on
+fsync if desired (fsync still flushes all cached write data to the server).
Version 1.56
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