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authorSteve French <stfrench@microsoft.com>2021-02-23 15:50:57 -0600
committerSteve French <stfrench@microsoft.com>2021-02-25 11:47:42 -0600
commit4c9f948142a550af416a2bfb5e56d29ce29e92cf (patch)
tree506950f721e6a7479c7ca71eb4492bc72af12deb /fs/cifs
parentf1ebe48dd3490adeff63b2d86ac7567aa018bd5d (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')
-rw-r--r--fs/cifs/cifsfs.c3
-rw-r--r--fs/cifs/connect.c2
-rw-r--r--fs/cifs/fs_context.c9
-rw-r--r--fs/cifs/fs_context.h4
4 files changed, 16 insertions, 2 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 6f33ff3f625f..4e0b0b26e844 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -637,8 +637,9 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
if (tcon->handle_timeout)
seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
- /* convert actimeo and display it in seconds */
+ /* convert actimeo and directory attribute timeout and display in seconds */
seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->actimeo / HZ);
+ seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
if (tcon->ses->chan_max > 1)
seq_printf(s, ",multichannel,max_channels=%zu",
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index cd6dbeaf2166..a9dc39aee9f4 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2278,6 +2278,8 @@ compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
if (old->ctx->actimeo != new->ctx->actimeo)
return 0;
+ if (old->ctx->acdirmax != new->ctx->acdirmax)
+ return 0;
return 1;
}
diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c
index 7d04f2255624..f3be07f4671d 100644
--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c
@@ -140,6 +140,7 @@ const struct fs_parameter_spec smb3_fs_parameters[] = {
fsparam_u32("rsize", Opt_rsize),
fsparam_u32("wsize", Opt_wsize),
fsparam_u32("actimeo", Opt_actimeo),
+ fsparam_u32("acdirmax", Opt_acdirmax),
fsparam_u32("echo_interval", Opt_echo_interval),
fsparam_u32("max_credits", Opt_max_credits),
fsparam_u32("handletimeout", Opt_handletimeout),
@@ -936,6 +937,13 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
goto cifs_parse_mount_err;
}
break;
+ case Opt_acdirmax:
+ ctx->acdirmax = HZ * result.uint_32;
+ if (ctx->acdirmax > CIFS_MAX_ACTIMEO) {
+ cifs_dbg(VFS, "acdirmax too large\n");
+ goto cifs_parse_mount_err;
+ }
+ break;
case Opt_echo_interval:
ctx->echo_interval = result.uint_32;
break;
@@ -1362,6 +1370,7 @@ int smb3_init_fs_context(struct fs_context *fc)
ctx->strict_io = true;
ctx->actimeo = CIFS_DEF_ACTIMEO;
+ ctx->acdirmax = CIFS_DEF_ACTIMEO;
/* Most clients set timeout to 0, allows server to use its default */
ctx->handle_timeout = 0; /* See MS-SMB2 spec section 2.2.14.2.12 */
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;