diff options
| author | Steve French <stfrench@microsoft.com> | 2021-02-23 15:50:57 -0600 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2021-02-25 11:47:42 -0600 |
| commit | 4c9f948142a550af416a2bfb5e56d29ce29e92cf (patch) | |
| tree | 506950f721e6a7479c7ca71eb4492bc72af12deb /fs/cifs/fs_context.h | |
| parent | f1ebe48dd3490adeff63b2d86ac7567aa018bd5d (diff) | |
cifs: Add new mount parameter "acdirmax" to allow caching directory metadata
nfs and cifs on Linux currently have a mount parameter "actimeo" to control
metadata (attribute) caching but cifs does not have additional mount
parameters to allow distinguishing between caching directory metadata
(e.g. needed to revalidate paths) and that for files.
Add new mount parameter "acdirmax" to allow caching metadata for
directories more loosely than file data. NFS adjusts metadata
caching from acdirmin to acdirmax (and another two mount parms
for files) but to reduce complexity, it is safer to just introduce
the one mount parm to allow caching directories longer. The
defaults for acdirmax and actimeo (for cifs.ko) are conservative,
1 second (NFS defaults acdirmax to 60 seconds). For many workloads,
setting acdirmax to a higher value is safe and will improve
performance. This patch leaves unchanged the default values
for caching metadata for files and directories but gives the
user more flexibility in adjusting them safely for their workload
via the new mount parm.
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-By: Tom Talpey <tom@talpey.com>
Diffstat (limited to 'fs/cifs/fs_context.h')
| -rw-r--r-- | fs/cifs/fs_context.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/cifs/fs_context.h b/fs/cifs/fs_context.h index 1c44a460e2c0..472372fec4e9 100644 --- a/fs/cifs/fs_context.h +++ b/fs/cifs/fs_context.h @@ -118,6 +118,7 @@ enum cifs_param { Opt_rsize, Opt_wsize, Opt_actimeo, + Opt_acdirmax, Opt_echo_interval, Opt_max_credits, Opt_snapshot, @@ -232,7 +233,8 @@ struct smb3_fs_context { unsigned int wsize; unsigned int min_offload; bool sockopt_tcp_nodelay:1; - unsigned long actimeo; /* attribute cache timeout (jiffies) */ + unsigned long actimeo; /* attribute cache timeout for files (jiffies) */ + unsigned long acdirmax; /* attribute cache timeout for directories (jiffies) */ struct smb_version_operations *ops; struct smb_version_values *vals; char *prepath; |