This is a note to let you know that I've just added the patch titled
smb3: allow deferred close timeout to be configurable
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
smb3-allow-deferred-close-timeout-to-be-configurable.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 284d135258d33430c1fe3be17a20ba53cc5f65f1
Author: Steve French <stfrench@xxxxxxxxxxxxx>
Date: Thu Aug 11 00:53:00 2022 -0500
smb3: allow deferred close timeout to be configurable
[ Upstream commit 5efdd9122eff772eae2feae9f0fc0ec02d4846a3 ]
Deferred close can be a very useful feature for allowing
caching data for read, and for minimizing the number of
reopens needed for a file that is repeatedly opened and
close but there are workloads where its default (1 second,
similar to actimeo/acregmax) is much too small.
Allow the user to configure the amount of time we can
defer sending the final smb3 close when we have a
handle lease on the file (rather than forcing it to depend
on value of actimeo which is often unrelated, and less safe).
Adds new mount parameter "closetimeo=" which is the maximum
number of seconds we can wait before sending an SMB3
close when we have a handle lease for it. Default value
also is set to slightly larger at 5 seconds (although some
other clients use larger default this should still help).
Suggested-by: Bharath SM <bharathsm@xxxxxxxxxxxxx>
Reviewed-by: Bharath SM <bharathsm@xxxxxxxxxxxxx>
Reviewed-by: Shyam Prasad N <sprasad@xxxxxxxxxxxxx>
Reviewed-by: Paulo Alcantara (SUSE) <pc@xxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Stable-dep-of: d19342c6609b ("cifs: sanitize paths in cifs_update_super_prepath.")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index fc736ced6f4a3..26f87437b2dd7 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -682,6 +682,7 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
}
+ seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / 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 555bd386a24df..f6c41265fdfd9 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2436,6 +2436,8 @@ compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
return 0;
if (old->ctx->acdirmax != new->ctx->acdirmax)
return 0;
+ if (old->ctx->closetimeo != new->ctx->closetimeo)
+ return 0;
return 1;
}
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index cca9ff01b30c2..b3cf9ab50139d 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -897,12 +897,12 @@ int cifs_close(struct inode *inode, struct file *file)
* So, Increase the ref count to avoid use-after-free.
*/
if (!mod_delayed_work(deferredclose_wq,
- &cfile->deferred, cifs_sb->ctx->acregmax))
+ &cfile->deferred, cifs_sb->ctx->closetimeo))
cifsFileInfo_get(cfile);
} else {
/* Deferred close for files */
queue_delayed_work(deferredclose_wq,
- &cfile->deferred, cifs_sb->ctx->acregmax);
+ &cfile->deferred, cifs_sb->ctx->closetimeo);
cfile->deferred_close_scheduled = true;
spin_unlock(&cinode->deferred_lock);
return 0;
diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c
index 3b8ed36b37113..85ad0c9e2f8b5 100644
--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c
@@ -143,6 +143,7 @@ const struct fs_parameter_spec smb3_fs_parameters[] = {
fsparam_u32("actimeo", Opt_actimeo),
fsparam_u32("acdirmax", Opt_acdirmax),
fsparam_u32("acregmax", Opt_acregmax),
+ fsparam_u32("closetimeo", Opt_closetimeo),
fsparam_u32("echo_interval", Opt_echo_interval),
fsparam_u32("max_credits", Opt_max_credits),
fsparam_u32("handletimeout", Opt_handletimeout),
@@ -1058,6 +1059,13 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
}
ctx->acdirmax = ctx->acregmax = HZ * result.uint_32;
break;
+ case Opt_closetimeo:
+ ctx->closetimeo = HZ * result.uint_32;
+ if (ctx->closetimeo > SMB3_MAX_DCLOSETIMEO) {
+ cifs_errorf(fc, "closetimeo too large\n");
+ goto cifs_parse_mount_err;
+ }
+ break;
case Opt_echo_interval:
ctx->echo_interval = result.uint_32;
break;
@@ -1496,6 +1504,7 @@ int smb3_init_fs_context(struct fs_context *fc)
ctx->acregmax = CIFS_DEF_ACTIMEO;
ctx->acdirmax = CIFS_DEF_ACTIMEO;
+ ctx->closetimeo = SMB3_DEF_DCLOSETIMEO;
/* 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 29601a4eb4116..b5ae210bafe04 100644
--- a/fs/cifs/fs_context.h
+++ b/fs/cifs/fs_context.h
@@ -123,6 +123,7 @@ enum cifs_param {
Opt_actimeo,
Opt_acdirmax,
Opt_acregmax,
+ Opt_closetimeo,
Opt_echo_interval,
Opt_max_credits,
Opt_snapshot,
@@ -243,6 +244,8 @@ struct smb3_fs_context {
/* attribute cache timemout for files and directories in jiffies */
unsigned long acregmax;
unsigned long acdirmax;
+ /* timeout for deferred close of files in jiffies */
+ unsigned long closetimeo;
struct smb_version_operations *ops;
struct smb_version_values *vals;
char *prepath;
@@ -275,4 +278,9 @@ static inline struct smb3_fs_context *smb3_fc2context(const struct fs_context *f
extern int smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx);
extern void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb);
+/*
+ * max deferred close timeout (jiffies) - 2^30
+ */
+#define SMB3_MAX_DCLOSETIMEO (1 << 30)
+#define SMB3_DEF_DCLOSETIMEO (5 * HZ) /* Can increase later, other clients use larger */
#endif
