From: Ronnie Sahlberg <lsahlber@redhat.com>
Date: Tue, 12 Mar 2019 13:58:31 +1000
Subject: [PATCH] cifs: cache FILE_ALL_INFO for the shared root handle
Git-commit: b0f6df737a1c5d9d5ff90cc946205d8af46cc067
Patch-mainline: v5.1-rc1
References: bsc#1144333
When we open the shared root handle also ask for FILE_ALL_INFORMATION since
we can do this at zero cost as part of a compound.
Cache this information as long as the lease is held and return and serve any
future requests from cache.
This allows us to serve "stat /<mountpoint>" directly from cache and avoid
a network roundtrip. Since clients often want to do this quite a lot
this improve performance slightly.
As an example: xfstest generic/533 performs 43 stat operations on the root
of the share while it is run. Which are eliminated with this patch.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Acked-by: Aurelien Aptel <aaptel@suse.com>
---
fs/cifs/cifsglob.h | 3 ++
fs/cifs/smb2inode.c | 15 ++++---
fs/cifs/smb2ops.c | 113 +++++++++++++++++++++++++++++++++++++++++++---------
fs/cifs/smb2pdu.c | 12 +++---
fs/cifs/smb2proto.h | 3 ++
5 files changed, 118 insertions(+), 28 deletions(-)
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index ddb299494cd6..8b9ecf8c2986 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -962,11 +962,14 @@ cap_unix(struct cifs_ses *ses)
struct cached_fid {
bool is_valid:1; /* Do we have a useable root fid */
+ bool file_all_info_is_valid:1;
+
struct kref refcount;
struct cifs_fid *fid;
struct mutex fid_mutex;
struct cifs_tcon *tcon;
struct work_struct lease_break;
+ struct smb2_file_all_info file_all_info;
};
/*
diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c
index 01a76bccdb8d..b6e07e2eed10 100644
--- a/fs/cifs/smb2inode.c
+++ b/fs/cifs/smb2inode.c
@@ -309,12 +309,17 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
rc = open_shroot(xid, tcon, &fid);
if (rc)
goto out;
- rc = SMB2_query_info(xid, tcon, fid.persistent_fid,
- fid.volatile_fid, smb2_data);
+
+ if (tcon->crfid.file_all_info_is_valid) {
+ move_smb2_info_to_cifs(data,
+ &tcon->crfid.file_all_info);
+ } else {
+ rc = SMB2_query_info(xid, tcon, fid.persistent_fid,
+ fid.volatile_fid, smb2_data);
+ if (!rc)
+ move_smb2_info_to_cifs(data, smb2_data);
+ }
close_shroot(&tcon->crfid);
- if (rc)
- goto out;
- move_smb2_info_to_cifs(data, smb2_data);
goto out;
}
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 1654d50b8aef..a338190b97fa 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -619,6 +619,7 @@ smb2_close_cached_fid(struct kref *ref)
SMB2_close(0, cfid->tcon, cfid->fid->persistent_fid,
cfid->fid->volatile_fid);
cfid->is_valid = false;
+ cfid->file_all_info_is_valid = false;
}
}
@@ -643,9 +644,18 @@ smb2_cached_lease_break(struct work_struct *work)
*/
int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
{
- struct cifs_open_parms oparams;
- int rc;
- __le16 srch_path = 0; /* Null - since an open of top of share */
+ struct cifs_ses *ses = tcon->ses;
+ struct TCP_Server_Info *server = ses->server;
+ struct cifs_open_parms oparms;
+ struct smb2_create_rsp *o_rsp = NULL;
+ struct smb2_query_info_rsp *qi_rsp = NULL;
+ int resp_buftype[2];
+ struct smb_rqst rqst[2];
+ struct kvec rsp_iov[2];
+ struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
+ struct kvec qi_iov[1];
+ int rc, flags = 0;
+ __le16 utf16_path = 0; /* Null - since an open of top of share */
u8 oplock = SMB2_OPLOCK_LEVEL_II;
mutex_lock(&tcon->crfid.fid_mutex);
@@ -657,22 +667,89 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
return 0;
}
- oparams.tcon = tcon;
- oparams.create_options = 0;
- oparams.desired_access = FILE_READ_ATTRIBUTES;
- oparams.disposition = FILE_OPEN;
- oparams.fid = pfid;
- oparams.reconnect = false;
-
- rc = SMB2_open(xid, &oparams, &srch_path, &oplock, NULL, NULL, NULL);
- if (rc == 0) {
- memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid));
- tcon->crfid.tcon = tcon;
- tcon->crfid.is_valid = true;
- kref_init(&tcon->crfid.refcount);
- kref_get(&tcon->crfid.refcount);
- }
+ if (smb3_encryption_required(tcon))
+ flags |= CIFS_TRANSFORM_REQ;
+
+ memset(rqst, 0, sizeof(rqst));
+ resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
+ memset(rsp_iov, 0, sizeof(rsp_iov));
+
+ /* Open */
+ memset(&open_iov, 0, sizeof(open_iov));
+ rqst[0].rq_iov = open_iov;
+ rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
+
+ oparms.tcon = tcon;
+ oparms.create_options = 0;
+ oparms.desired_access = FILE_READ_ATTRIBUTES;
+ oparms.disposition = FILE_OPEN;
+ oparms.fid = pfid;
+ oparms.reconnect = false;
+
+ rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, &utf16_path);
+ if (rc)
+ goto oshr_exit;
+ smb2_set_next_command(tcon, &rqst[0]);
+
+ memset(&qi_iov, 0, sizeof(qi_iov));
+ rqst[1].rq_iov = qi_iov;
+ rqst[1].rq_nvec = 1;
+
+ rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID,
+ COMPOUND_FID, FILE_ALL_INFORMATION,
+ SMB2_O_INFO_FILE, 0,
+ sizeof(struct smb2_file_all_info) +
+ PATH_MAX * 2, 0, NULL);
+ if (rc)
+ goto oshr_exit;
+
+ smb2_set_related(&rqst[1]);
+
+ rc = compound_send_recv(xid, ses, flags, 2, rqst,
+ resp_buftype, rsp_iov);
+ if (rc)
+ goto oshr_exit;
+
+ o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
+ oparms.fid->persistent_fid = o_rsp->PersistentFileId;
+ oparms.fid->volatile_fid = o_rsp->VolatileFileId;
+#ifdef CONFIG_CIFS_DEBUG2
+ oparms.fid->mid = le64_to_cpu(o_rsp->sync_hdr.MessageId);
+#endif /* CIFS_DEBUG2 */
+
+ if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
+ oplock = smb2_parse_lease_state(server, o_rsp,
+ &oparms.fid->epoch,
+ oparms.fid->lease_key);
+ else
+ goto oshr_exit;
+
+
+ memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid));
+ tcon->crfid.tcon = tcon;
+ tcon->crfid.is_valid = true;
+ kref_init(&tcon->crfid.refcount);
+ kref_get(&tcon->crfid.refcount);
+
+
+ qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
+ if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
+ goto oshr_exit;
+ rc = smb2_validate_and_copy_iov(
+ le16_to_cpu(qi_rsp->OutputBufferOffset),
+ sizeof(struct smb2_file_all_info),
+ &rsp_iov[1], sizeof(struct smb2_file_all_info),
+ (char *)&tcon->crfid.file_all_info);
+ if (rc)
+ goto oshr_exit;
+ tcon->crfid.file_all_info_is_valid = 1;
+
+ oshr_exit:
mutex_unlock(&tcon->crfid.fid_mutex);
+ SMB2_open_free(&rqst[0]);
+ SMB2_query_info_free(&rqst[1]);
+ free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
+ free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
return rc;
}
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 60fbe306f604..cfe9fe41ccf5 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1797,9 +1797,10 @@ create_reconnect_durable_buf(struct cifs_fid *fid)
return buf;
}
-static __u8
-parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
- unsigned int *epoch, char *lease_key)
+__u8
+smb2_parse_lease_state(struct TCP_Server_Info *server,
+ struct smb2_create_rsp *rsp,
+ unsigned int *epoch, char *lease_key)
{
char *data_offset;
struct create_context *cc;
@@ -2456,8 +2457,9 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
}
if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
- *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
- oparms->fid->lease_key);
+ *oplock = smb2_parse_lease_state(server, rsp,
+ &oparms->fid->epoch,
+ oparms->fid->lease_key);
else
*oplock = rsp->OplockLevel;
creat_exit:
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 87733b27a65f..72cc563c32fe 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -223,6 +223,9 @@ extern int smb3_validate_negotiate(const unsigned int, struct cifs_tcon *);
extern enum securityEnum smb2_select_sectype(struct TCP_Server_Info *,
enum securityEnum);
+extern __u8 smb2_parse_lease_state(struct TCP_Server_Info *server,
+ struct smb2_create_rsp *rsp,
+ unsigned int *epoch, char *lease_key);
extern int smb3_encryption_required(const struct cifs_tcon *tcon);
extern int smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
struct kvec *iov, unsigned int min_buf_size);
--
2.16.4